TECHNOLOGIES CUSTOMIZED LIST version 1 - jisf.or.jp · PDF fileTECHNOLOGIES CUSTOMIZED LIST version 1.0 ... dedusting system in EAF meltshop - Damper openings and exhaust fan rotation

TECHNOLOGIES CUSTOMIZED LIST version 1.0

For Technology Transfer to Vietnamese Iron and Steel IndustryWith regard to Energy-Saving, Environmental Protection, and Recycling

DEVELOPED AT ASEAN-JAPAN STEEL INITIATIVE

Technologies Customized List & Technologies One by One Sheets Ver.1.0

For Vietnamese Iron and Steel Industry

Table of Contents

1. Technologies Customized List 3

2. Technologies One-by-One Sheet 9

ANNEX 1.

Other Recommended Technologies for the future for Vietnam 33

1.

Technology selection criteria

30 technologies, based on the “Technologies Customized List” are considered to be significant countermeasures to tackle with energy conservation issues of ASEAN iron and steel industry. These 30 technologies were chosen by filtering under [Major premises]. These conditions are described below. Major premises Scope of AJSI activities: Energy saving, Environment protecting and Recycling technologies for steel plants operating with Electric Arc Furnace (EAF)

P.1 Technologies under development in Japan are considered NOT to be eligible.

P.2 Technologies mainly intended to improve quality of steel products and steel making processes are considered NOT to be eligible in order to keep the “healthy competition” in the market.

P.3 Non-commercialized technologies which engineering suppliers have not brought to market as “commercial products” yet and suppliers are unable to provide, are NOT to be eligible.

5

Pre-Conditions for Calculations of Effects

Equipment List of Model Steel Plant

Annual Production 500,000 ton/year EAF RHF

Equipment Name Value Equipment Name Value Nominal capacity 80 ton Type Walking beam TTT 52 minutes Nominal capacity 100 ton/h Iron source 100 % scrap Heated material 135 SQ billet Scrap preheating none Heating temperature 1100 degC Scrap charging 3 times Fuel Natural gas,

LHV 44 MJ/m3N Ladle furnace used Combustion air preheating around 300 degC

with low grade recuperator

NG burner used only to facilitate melting

Computer control to set furnace temperature with heat transfer simulation

none

O2 and C lances installed only at slag-door side,

water-cooled type

Hot charge and/or direct rolling

none

Process control by exhaust gas analysis and/or computer

none Insulation firebrick

Electricity consumption 430 kWh/ton Heat consumption 1,450 MJ/ton-steel

Oxygen consumption 30 m3N/ton Natural gas consumption 20 m3N/ton Coke consumption 15 kg/ton Product Mild steel less

than 0.2 % C Tapping temperature 1620 degC

Operating Environment

Item Value Reference Electricity Cost US$ 0.077 / kWh (2013) JETRO website: http://www.jetro.go.jp/world/search/cost/

Fuel Cost US$ 35.04 / GJ (2013) JETRO website: http://www.jetro.go.jp/world/search/cost/

CO2 Emission Factor 415 kg-CO2 / MWh CO2 EMISSIONS FROM FUEL COMBUSTION Highlights (2013 Edition) IEA Average rate of 2009-2011

6

Electricity saving

Thermalenergysaving

CO2

reduction

Profit/Operation Cost[*1] [*2]

(kWh/tof

product)

(GJ/tof

product)

(kg-CO2/tof

product)

US$/t of product,Vietnam

million US$ in Vietnam

year inVietnam

A. Energy Saving for Electric Arc Furnace (EAF)

1 A-1High temperaturecontinuous scrappreheating EAF

Combination of the technologies of- Air tight structure- High temperature scrap preheating (over 700 degC)- Continuous preheated scrap charging- Automatic process control by using data logging- Post-combustion of generated CO gas- Dioxin decomposition by secondary combustion

150.0 - 62.3

- Decompositionand reduction ofdioxin, dispersingdust, & noise

- Low electrodeconsumption (0.8 -1.0 kg/ton-productat AC)

11.5 26.2 [*3] 4.6

- JP SteelPlantech

2 A-2Medium temperaturebatch scrappreheating EAF

- High melting efficiency batch charging type EAF withSPH.- Preheated scrap temperature is about 250 - 300 degC.- Fully enclosed automatic charging system to keep workingfloor clean.- Minimize scrap oxidation by temperature controlling- Material limitation free

40.0 - 16.6

- Reduction ofdioxin emission,dispersing dust, &noise

-No limit ofmaterial for highquality products aslike stainless steel.

3.1 6.9 [*4] 4.5

- Daido Steel

3 A-3High efficiency oxy-fuel burner/lancingfor EAF

- Supersonic or coherent burner- Accelerate scrap melting during melting stage- Facilitate slag foaming during refining stage over the bath 14.3 - 5.9 -

- Reduction ofnitorgen in steel forqualityimprovement

1.1 1.4 2.6

- Nikko- JP SteelPlantech

4 A-6 Optimizing slagfoaming in EAF

- Proper chemical ingredients of slag- High efficient burner and/or lance- Controlled O2 & C injection into EAF proper position- Keeping slag thickness with air-tight operation

6.0 - 2.5- Noise reduction &working floorcleaning

- 0.5 1.0 4.5

- JP SteelPlantech- Daido Steel

5 A-7 Optimized powercontrol for EAF

- Data logging and visualization of melting process- Automatic judgement on meltdown and additional scrapcharge- Automatioc phase power independent control for well-balanced melting

15.0 - 6.2 -- Productivityincrease- Manpower saving

1.1 1.0 1.8

- JP SteelPlantech

6 A-8Operation supportsystem with EAFmeltdown judgment

Automatic Rapid Melting system- Data logging- Optimum electric power control- Alloy calculation- Automatic meltdown Judgment

6.0 - 2.5 -

- Productivityincrease- Manpower saving- Operationstandardization

0.5 0.3 [*5] 1.5

- Daido Steel

7 A-9

Low NOxregenerative burnersystem for ladlepreheating

- Regenerating burner use- High Energy Saving- Automatic control- FDI Combustion

- 40% - - NOx reduction - -

Vertical:0.4

Horizontal:0.3

4.0

- Chugai-Ro- NipponFurnace

8 A-10Oxygen burnersystem for ladlepreheating

- Rapid and high temperature ladle heating by oxygenburner- Automatic control

- 40% - - NOx reduction - - 0.2 2.0

- Chugai-Ro- JP SteelPlantech

9 A-11 Waste heat recoveryfrom EAF [*6]

- Waste heat boiler based on the OG boiler technology- Specified for splash and dust containing 132.0 - 54.8 - - 10.1 41.4 8.2

- JP SteelPlantech

10 A-12Energy saving fordedusting system inEAF meltshop

- Damper openings and exhaust fan rotation are controlledin consonance- Combination of VVVF and proper damper opening

6.0 [*7] - 2.5 - Better workingfloor & atmosphere - 0.5 0.6 2.4


11 B-2 Floating dust controlin EAF meltshop

- Analyze air flow in EAF building

- - -

- Restrict dustloading on workingfloor to less than 5mg/m3

- - 0.1 [*8] -


12 B-3Dioxin adsorptionby activated carbonfor EAF exhaust gas

- Packaged cartridges of activated carbon fixed at the exit ofbag-filter adsorbs and removes dioxins and heavy metals toan extremely low level - - -

- Dioxin will belower than 0.1 ngTEQ/m3N

- - 4.8 -

- JFEEngineering

13 B-4

Dioxin adsorptionby mixing EAFexhaust gas withbuilding dedustinggas

- Cooling direct evacuation gas by mixing with buildingdedusting gas

- - -- Dioxin will belower than 5.0 ngTEQ/m3N

- - 10.4 [*9] -


14 B-5

Dioxin adsorptionby 2 step bagfiltertechnology for EAFexhaust gas

- 2 step bag system can remove over 99% DXN's fromEAF.- This system provide a clean working environment.- Effective evacuation decrease the consumption ofelectricity.

- - -- Dioxin will belower than 0.5 ngTEQ/m3N

- -0.2 2.8 [*10] -


ID

AssumedPayback

time MainJapanesesupplierEnvironmental benefits Co-benefits

B. Environmental Protection for Electric Arc Furnace

Technologies Customized List for Energy Saving, Environmental Protection,and Recycling for Steel Industry in Vietnam

No. Title of technology Technical description

Expected effects of introduction Assumedinvestment

cost

7

Electricity saving

Thermalenergysaving

CO2

reduction


(kWh/tof

product)

(GJ/tof

product)

(kg-CO2/tof

product)



year inVietnam

ID

AssumedPayback

time MainJapanesesupplierEnvironmental benefits Co-benefits

Technologies Customized List for Energy Saving, Environmental Protection,and Recycling for Steel Industry in Vietnam


Expected effects of introduction Assumedinvestment

cost

15 C-1EAF dust and slagrecycling system byoxygen-fuel burner

- Zn recovery rate will be expected to be 95%- Fe in EAF dust cannot be recovered as metal

- - - -

- Zn material andconcrete aggregatecan be gained fromEAF dust

1.5 [*11] 12.4 24.0

- Daido Steel

16 D-1 Process control forreheating furnace

- Setting furnace temperature by targeted billet temperaturecurve- Precise air ratio control and O2 analysis in exhaust gas

- 0.02 - - - 0.5 0.4 1.6

- Chugai-Ro

17 D-2

Low NOxregenerative burnertotal system forreheating furnace

- High efficient and durable burner system

- 0.19 - - CO2 & NOxReduction - 6.6 2.8 0.8

- Chugai-Ro- NipponFurnace

18 D-3High temperaturerecuperator forreheating furnace

- Heat transfer area is expanded- Special material tube is used instead of stainless

- 0.10 - - - 3.5 1.4 0.8

- Chugai-Ro

19 E-1

Inverter (VFD;Variable FrequencyDrive) drive formotors

Applying the Multi-Level Drive for motors enables to saveenergy cost from vane and valve control (constant speedmotor).・Eco-Friendly・Power Source Friendly・Less Maintenance・Motor Friendly

13% - - - CO2 Reduction - 550,000/year [*12] 1.2 3.0

- Hitachi- Majorelectricequipmentsuppliers

20 E-2Energy monitoringand managementsystems

- Energy data are collected in process computer forevaluation - 0.12 - - - 4.2 0.6 0.3

- Majorelectricequipmentsuppliers

21 E-3

Management ofcompressed airdelivery pressureoptimization

- Energy saving in compressors requires consideration ofthe following points. * Selection of the appropriate capacity * Reduction in delivery pressure

285MWh/y - - - - - - -

- Majorelectricequipmentsuppliers

[*1] Opearation cost is indicated in minus (-)[*2] Co-benefits are not taken account into profits and operation costs[*3] Assumed investment cost is the revamping cost of existing conventional EAF[*4] Assumed investment cost is additional cost from the cost of a conventional EAF investment[*5] Assumed investment cost is the adoption cost to existing EAF[*6] Suited to DRI continuous charging EAF, not scrap EAF[*7] Assumed electricity consumption for building dedusting is 24 kWh/ton-product, and 25 % power saving is expected[*8] Investment cost of 0.1 million US$ is the 3-D flow analysis fee[*9] Investment cost is addition cost of building dedusting system to the independent direct dedusting system[*10] Install direct baghouse and booster blower for direct EAF exist dedusting system[*11] Assumed ZnO selling price : 500 US$/ton[*12] Assumed Annual operation : 3,600 h/y

C. Material Recycle for Electric Arc Furnace

D. Energy Saving for Reheating Furnace

E. Common systems and General Energy Savings

8

2.

・Electricity Saving

・Thermal EnergySavings

・CO2 Reduction

・Environmentalbenefits

・Co-benefits

・Profit

Low electrode consumption (0.8 - 1.0 kg/ton-product at AC)

11.5 US$/ton-product (assumed electricity price = 0.077 US$/kWh) (Rounded off to one decimal place)

3. ExpectedEffect of

TechnologyIntroduction

5. Assumed Payback Time 4.6 years (26.2 million US$ / 11.5 US$/ton-product * 500,000 t-product/year)

-

4. Assumed Investment Cost 26.2 million US$ (assuming 80 ton EAF revamping)

Decomposition and reduction of dioxin, dispersing dust, & noise

8. Comments <Precondition on calculation of investment cost>Assumed investment cost is the revamping cost of existing conventional EAF

6. Japanese Main Supplier JP Steel Plantech7. Technologies Reference SOACT 2nd Edition ("Ecological and Economical Arc Furnace"), Diagram from JP Steel Plantech

62.3 kgCO2/t-product


High temperature continuous scrap preheating EAFItem Content

A-1

150 kWh/ton-product

2. TechnologyDefinition/Specification

Preheating scraps with high-temperature exhaust gas is possible because the preheating shaft and melting chamber aredirectly and rigidly connected, so the scraps are continually present, from the steel to preheating areas.This enables high-temperature preheating of the scraps, resulting in a significant reduction of power consumption.The melting chamber is sealed off from outside air, to prevent the excess air inlet. It prevents over oxidation of scrap underhigh temperature preheating.As this equipment keeps always flat bath operation, electrode consumption is significantlyimproved.Furthermore, the electric facilities necessary to meet power quality regulation can be drastically reduced on it may not evenunnecessary depending on required regulation.Dioxins are decomposed through an exhaust gas combustion chamber and rapid quench chamber in the exhaust gas ductsystem. Not only dioxins but also a volatile material that causes foul odors and white smoke will be decomposed and thedispersal of them are also prevented.The furnace prevents diluting of exhaust gasses. Therefore, the CO within the exhaustgas can be used as fuel, reducing the amount of fuel gas consumed.Flat bath operation dramatically reduces noise duringoperation. The reduction of power consumption also contributes to the reduction of emission of greenhouse gasses duringpower generation.

1. Process Flow or Diagram

11



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference May contact to Daido Steel

8. Comments <Precondition on calculating investment cost>Assumed investment cost is additional cost from the cost of a conventional EAF investment.



6. Japanese Main Supplier Daido Steel


- High melting efficiency batch charging type EAF with SPH.- Preheated scrap temperature is about 250 - 300 degC.- Fully enclosed automatic charging system to keep working floor clean.- Minimize scrap oxidation by temperature controlling- Material limitation free



40 kWh/ton-product

-

No limit of material for high quality products as like stainless steel.


Reduction of dioxin emission, dispersing dust, & noise


A-2 A. Energy Saving for Electric Arc Furnace (EAF)

Medium temperature batch scrap preheating EAFItem Content


12



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference SOACT 2nd edition (Add the word "High efficiency" to SOACT item for up-to-date oxygen use), Diagram from Nikko

8. Comments <Source of "Electricity saving"> 0.14 GJ/ton in SOACT ---> 0.14 x 9.8/1000 = 14.3 kWh/ton



6. Japanese Main Supplier Nikko, JP Steel Plantech


High efficiency thermal effect technologies of- Scrap melting during melting stage- Alternative Energy Input by Oxy-Fuel / Lancing Burner- Multi Injection Technologie of Carbon / Alloy powders- Slag Management for foaming slag- Bottom Stirring (by Ar or N2 gas) for uniformed rapid melting



14.3 kWh/ton-product

-

Reduction of nitorgen in steel, quality improvement


-

5.9 kgCO2/t-product


High efficiency oxy-fuel burner/lancing for EAFItem Content


13



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference SOACT 2nd Edition (Delete the word "Exchangeable Furnace and Injection Technology"), Diagram from JP Steel Plantech

8. Comments

<Source of "Electricity saving"> (1) 2.5 - 3 % energy saving in SOACT ---> 430 kWh/ton x 0.03 = 12.9 kWh/ton (2) The phenomenum is explained by several factors, 6 kWh/ton is reasonable (Japanese experts).<Preconditions on calculating investment costs>- "Investment cost" is based on equipment supplier's rough estimation.

4. Assumed Investment Cost 1.0 million US$ (adding coherent burner and accurate C&O2 charging system)


6. Japanese Main Supplier JP Steel Plantech, Daido Steel


- Proper chemical ingredients of slag (Basicity 1.5 - 2.2, FeO 15 - 20 %)- High efficient burner and/or lance- Controlled O2 & C injection into EAF proper position- Keeping slag thickness with air-tight operation



6 kWh/ton-product

-

-


Noise reduction & working floor cleaning

2.5 kgCO2/t-product


Optimizing slag foaming in EAFItem Content


14



・CO2 Reduction


・Co-benefits

・Profit


Optimized power control for EAFItem Content



- Data logging and visualization of melting process- Automatic meltdown and additional scrap charging judgement- Automatic phase power independent control for well-balance melting



15 kWh/ton-product

-

Productivity increaseManpower saving

-


6.2 kgCO2/t-product

7. Technologies Reference SOACT 2nd Edition ("Improved Process Control (Neural Networks)"), Diagram from JP Steel Plantech

8. Comments -

4. Assumed Investment Cost 1.0 million US$


6. Japanese Main Supplier JP Steel Plantech

Statistical analysis Slag foaming detection

Heat loss supervision Power supply control for each phase

15



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference May contact to Daido Steel

8. Comments <Preconditions on calculating investment cost> Assumed investment cost is the adoption cost to existing EAF





Automatic rapid melting system for EAF- Optimum electric power control- Reporting, Data logging and online data communications- Automatic meltdown Judgment- Power supply and electrode position control for each phase



6 kWh/ton-product

-

Productivity increaseManpower saving


-

2.5 kgCO2/t-product


Operation support system with EAF meltdown judgmentItem Content


16



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from Chugai Ro, May contact to suppliers

8. Comments -

4. Assumed Investment Cost Vertical: 0.4 million US$Horizontal: 0.3 million US$

5. Assumed Payback Time 3~4 years (Supplier's estimation based on experience)

6. Japanese Main Supplier Chugai-Ro, Nippon Furnace


While one of the burners is burning, the other burner will work as an exhaust outlet. The exhaust gas is discharged from thesystem after the waste heat of the gas is recovered so that the temperature of the gas will be lowered to the extent that therewill be no condensation in the regenerator. The combustion air receives heat from the regenerator. Therefore, the combustionair will be preheated to a super-high temperature (i.e., 90% of the temperature of the exhaust gas or over) before thecombustion air is supplied to the burner. When the preset cycle time elapses, the burners exchange their roles of combustionand exhaustion.



-

40% fuel saving is expected comparing to existing preheater

Improving meltshop atmosphere by reducing hot gas which disturbs dirty gas suction at the canopy


Low NOｘ

Not Announced

A-9A. Energy Saving for Electric Arc Furnace (EAF)

Low NOx regenerative burner systemfor ladle preheating

Item Content


17



・CO2 Reduction


・Co-benefits

・Profit


8. Comments -


5. Assumed Payback Time 2.0 years (Supplier's estimation based on experience)

6. Japanese Main Supplier Chugai-Ro, JP Steel Plantech


Oxygen combustion achieve rapid heating by high flame temperature. High flame temperature achieve high walltemperature, therefore it can be possible low temperature feeding of melted metal in to the ladle.



-


-


Low NOｘ

Not Announced


Oxygen burner system for ladle preheatingItem Content


18



・CO2 Reduction


・Co-benefits

・Profit

8. Comments

<Preconditions on calculating effects>- Power generation is 248,000 MWh/year with two 150 ton EAFs for DRI- Assumed annual production by two 150 ton EAF = 500,000 / 80 x 150 x 2 = 1,875,000 ton/y- Unit power generation = 248,000 x 1,000 / 1,875,000 = 132 kWh/ton-product- Suited to DRI continuous charging EAF, not scrap EAF

4. Assumed Investment Cost 41.4 million US$ for two 150 ton EAFs for DRI





132 kWh/ton-product


7. Technologies Reference Diagram from JP Steel Plantech, May contact to JP Steel Plantech

-

-

-



- Waste heat boiler based on the OG boiler technology- Specified for splash and dust containing- Main boiler is radiative type, and convective type super heater is located at the downstream of boiler to avoid clogging.


Waste heat recovery from EAFItem Content


19



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from JP Steel Plantech, May contact to suppliers

8. Comments <Preconditions on calculating effects>Assumed electricity consumption for building dedusting is 24 kWh/ton-product, and 25 % power saving is expected.

4. Assumed Investment Cost 0.6 million US$ (adding VVVF system to main fans)




- Damper openings and exhaust fan rotation are controlled in consonance with the furnace operation pattern- Combination of VVVF and proper damper opening



6 kWh/ton-product

-

-


Better working floor and atmosphere

2.5 kgCO2/t-product


Energy saving for dedusting system in EAF meltshopItem Content


20



・CO2 Reduction


・Co-benefits

・Operation Cost

7. Technologies Reference Diagram from JP Steel Plantech, May contact to suppliers

8. Comments<Precondition on calculating investment cost>Investment cost of 0.1 million US$ is the 3-D flow analysis fee.Building and suction system revamping shall be executed based on the flow analysis.


5. Assumed Payback Time Not Announced



- In modern EAF meltshop, fully enclosed building is required to avoid dust dispersion to the outside environment.- Enclosed building raises workfloor pollution which affects workers health.- Proper design and operation of dedusting system based on the flow analysis and real dust data are essential.- Restrict dust loading on working floor to less than the value specified by Industrial Safety and Health Act (for ex. 5mg/m3)



-

-

-

Not Announced

Restrict dust loading on working floor to less than 5 mg/m3

-

B-2 B. Environmental Protection for Electric Arc Furnace

Floating dust control in EAF meltshopItem Content


Dust loading after 30 sec. of scrap charge

Floating dust detector

21



・CO2 Reduction


・Co-benefits

・Operation Cost

7. Technologies Reference Diagram from JFE Engineering, May contact to JFE Engineering

8. Comments -



6. Japanese Main Supplier JFE Engineering


A new dioxin-removal system passes exhaust gas through a layer of granular activated carbon with outstanding adsorptionperformance. High-performance activated carbon was developed exclusively for the system. Packaged cartridges with aunique structure allowing the system to adsorb and remove dioxins and heavy metals to an extremely low levels. A cartridgewith a unique structure ensures improved contact efficiency between activated carbon and exhaust gas. Consequently, thefilled quantity of activated carbon is considerably reduced allowing unparalleled compact size. In addition, amount ofconsumed activated carbon would be substantially reduced comparing to previous Activated Carbon Adsorption Tower.Furthermore, it would save electricity consumption of blower since its pressure loss would be lower than 0.5kPa (Approx. 50mmAq) per a cartridge comparing to previous equipment.



-

-

-

Not Announced

Dioxin will be lower than 0.1 ng TEQ/m3N

-


Dioxin adsorption by activated carbon for EAF exhaust gasItem Content


22



・CO2 Reduction


・Co-benefits

・Operation Cost

7. Technologies Reference Diagram from Daido Steel, May contact to suppliers

8. Comments <Preconditions on calculating investment cost>Investment cost is addition cost of building dedusting system to the independent direct dedusting system.




2. TechnologyDefinition/Specification - Cooling direct evacuation gas by mixing with building dedusting gas



-

-

-

Not Announced


-

B-4B. Environmental Protection for Electric Arc Furnace

Dioxin adsorption by mixing EAF exhaust gaswith building dedusting gas

Item Content


23



・CO2 Reduction


・Co-benefits

・Operation Cost

7. Technologies Reference Diagram from Daido Steel, May contact to suppliers

8. Comments <Preconditions on calculating investment cost>Install direct baghouse and booster blower for direct EAF exist dedusting system.





The direct dust collector or the dust collecting route in the building can be switched over to collect the dust efficientlycorresponding to the status of operation of the electric arc furnace so that clean operating environment can be offered.It is possible to select the appropriate volume of suction gas according to the operation pattern of the electric arc furnace sothat the power required for the equipment can be reduced. It is possible to remove 99% or more of dioxins by the use of the2-step bug house with activated carbon system. Dioxin will be lower than 0.1 ng TEQ/m3N if activated carbon is injected.(Additional cost of US$ 1.0 mil required)



-

-

-

0.2 US$/ton-product


-


Dioxin adsorption by 2 step bagfilter technologyfor EAF exhaust gas

Item Content


Activated Carbon

24



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from Daido Steel, May contact to Daido Steel

8. Comments <Preconditions on calculating profit>- ZnO selling price : 500 US$/ton

4. Assumed Investment Cost 12.4 million US$ (for 6 ton/hr. capacity DSM)

5. Assumed Payback Time 24 years (Supplier's estimation based on experience)



As dust and slag are melted down completely at high temperature, it is very effective against dioxin.Produced valuable substances are completely harmless and can meet all environmental standards.More than 99% of dioxin can be removed by high temperature treatment in the furnace and strong rapid cooling mechanism.Besides electrical furnace dust and reduced slag, it is expected that this system will be applied to other waste treatments.The equipment is simple and compact because of unnecessary pretreatment such as dust granulation and so forth.Through simple design, excels in operability and suitable for on-site processing.



-

-

Zn material can be gained from EAF dustConcrete aggregate can be gained from EAF dust

1.5 US$/ ton (Operation cost will be less than profit.)

-

-

C-1 C. Material Recycle for Electric Arc Furnace

EAF dust and slag recycling system by oxygen-fuel burnerItem Content


25



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference May contact to Chugai-Ro

8. Comments -

4. Assumed Investment Cost 0.4 million US$ for 100 ton/h reheating furnace (adding new function to the existing furnace)


6. Japanese Main Supplier Chugai-Ro


- Setting furnace temperature by targeted billet temperature curve- Precise air ratio control and O2 analysis in exhaust gas



-

0.02 GJ/ton-product (1 % fuel saving from the base line of 1,450 MJ/ton)

-

0.5 US$/ton-product (assumed fuel price = 35.04 US$/GJ) (Rounded off to one decimal place)

-

Not Announced

D-1 D. Energy Saving for Reheating Furnace

Process control for reheating furnaceItem Content


Furnace temp.

Billet temp.

26



・CO2 Reduction

・Environmentalbenefits・Co-benefits

・Profit


8. Comments -



6. Japanese Main Supplier Chugai-Ro, Nippon Furnace


While one of the burners is burning, the other burner will work as an exhaust outlet.The exhaust gas is discharged from the system after the waste heat of the gas is recovered so that the temperature of the gaswill be lowered to the extent that there will be no condensation in the regenerator. The combustion air receives heat from theregenerator.Therefore, the combustion air will be preheated to a superhigh temperature (i.e., 90% of the temperature of the exhaust gasor over) before the combustion air is supplied the burner. When the preset cycle time elapses, the burners exchange theirroles of combustion and exhaustion.



-

0.19 GJ/t (about -13%)

-


CO2 & NOx Reduction

Not Announced

D-2D. Energy Saving for Reheating Furnace

Low NOx regenerative burner total systemfor reheating furnace

Item Content


27



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from Chugai Ro, May contact to Chugai Ro

8. Comments <Preconditions on calculating effects>When 300 degC air temperature is raised to 500 degC





The existing recuperator of two-pass type will be changed to high-efficiency recuperator of four-pass type in order to raisethe preheating air temperature.

For this purpose, the following shall be needed. - Modification of Recuperator room - Change of air duct - Increase of discharge pressure of blower - High efficiency recuperator



-

0.10 GJ/t (about -7%)

-


CO2 & NOx Reduction

Not Announced


High temperature recuperator for reheating furnaceItem Content


Fuel : Natural Gas Heating Temperature : 1,100 deg C Air ratio : 1.10

28



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from Hitachi, Ltd., May contact to Hitachi, Ltd.

8. Comments <Preconditions on calculating effects>- Annual operation : 3,600 h/y

4. Assumed Investment Cost Approximately 1.2 million US$ (including construction cost, differ from conditions of the facility)

5. Assumed Payback Time 2~3 years (Depending on the country and conditions of the facility)

6. Japanese Main Supplier Hitachi, Ltd., Major electric equipment companies


- Eco-Friendly Total efficiency of 97% is achieved. 20-30% of energy can be saved with fans and pumps. Separated installation is available for Transformer section.- Power Source Friendly Current harmonic at the power source conforms to IEEE519-1992 guidelines.- Less Maintenance Reliable, available and serviceable of maintenance tool are widely arranged.- Motor Friendly Series connected IGBT produce sinusoidal waveform of output voltage and current. It is best for to retrofit with existing motors.



13% (Depending on the country and conditions of the facility)

-

-

Approximately 550,000 US$/ year ( as of currency exchange rate of Oct., 2014)

CO2 Reduction

Not Announced

E-1 E. Common systems and General Energy Savings

Inverter (VFD; Variable Frequency Drive) drive for motorsItem Content


29



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference

*1 Farla, J.C.M., E. Worrell, L. Hein, and K. Blok, 1998. Actual Implementation of Energy Conservation Measures in theManufacturing Industry 1980-1994, The Netherlands: Dept. of Science, Technology & Society, Utrecht University.*2 ETSU, 1992. “Reduction of Costs Using an Advanced Energy Management System,” Best Practice Programme, R&DProfile 33, Harwell, UK: ETSU

8. Comments -

4. Assumed Investment Cost It depends on system structure, from data monitoring network to whole control computer system. One example inNetherlands (was aquired by Tata Steel, and nominal capacity is 6.3Mt/y.) is 0.6 million US$

5. Assumed Payback Time 0.3 years (Depends on cost of fuel and electricity of each site)

6. Japanese Main Supplier Major electric equipment suppliers


This measure includes site energy management systems for optimal energy consumption in the plant.- Online monitoring: This is often used for the most important energy flows at the site. The data are stored for a long timeso that typical situations may be analyzed. It is very important to monitor for all energy sources on online. It is the maintechnique used to avoid energy losses.- Continuous monitoring systems: Since all energy-related process parameters are used to optimize process control and toenable instant maintenance, undisrupted production process could be achieved.- Reporting and analyzing tools: Reporting tools are often used to check the average energy consumption of each process.In connection with cost controlling, controlling energy is the basis for optimizing energy consumption and cost savings. Anenergy controlling system enables to compare actual data with historical data (e.g. charts)



-

0.12 GJ/t-steel [*1, 2]

-

4.2 US$/ton-product

-

Not Announced


Energy monitoring and management systemsItem Content


Online monitoring and logging system for energy currents

Electric Power Steam Fuel Oxygen

Daily and monthly reports of energy

balance

30



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Energy saving Diagnosis Examples – Common Equipment Volume’, Energy conservation Center, Japan

8. Comments

<Preconditions on calculating effects>- Number of compressors; Total of 17, *Delivery pressure; 0.8MPa,- Equipment capacity; 823 kW, *On-load operation load; 60%,- Daily operation; 24 h/d, *Annual operation; 241 days'- Unit cost of power : 0.145 US$/kWh

4. Assumed Investment Cost Not Announced


6. Japanese Main Supplier Major electric equipment suppliers


'The delivery pressure of compressors is generally 100 kPa or higher. Compressors have been developed for a variety ofapplications. Table shows the types of compressors available, and their range of applications.Energy saving in compressors requires consideration of the following points. * Selection of the appropriate capacity * Reduction in delivery pressureSince the required motive power increases with increased delivery pressure, delivery pressure should be reduced as muchas possible, while at the same time being sufficient for the receiving equipment (Fig. ), however it should be noted thatmotive power does not decrease with delivery pressure in the case of turbo compressors. * Prevention of leakage * Reduction in temperature of the compressed air * Reduction in intake air resistanceIntake air resistance increases with intake filters, silencers, and valves in piping etc, and will increase the required motivepower if excessive. Care is required to reduce pressure losses in the intake air system through periodic cleaning of filters toeliminate clogging. * Reduction in piping resistance



285 MWh/y

-

-

Not Announced

-

Not Announced


Management of compressed air delivery pressure optimizationItem Content


31

Electricity saving

Thermalenergysaving

CO2

reduction


(kWh/tof

product)

(GJ/tof

product)

(kg-CO2/tof

product)



year inVietnam


1 A-4Eccentric bottomtapping (EBT) onexisting furnace

- Slag free tapping- Reliable stopping and scraping mechanism

15.0 - 6.2 -

- Increase in Fe &alloy yield,productivity- Improve steelquality

1.1 2.8 [*3] 4.8


2 A-5 Ultra high-powertransformer for EAF

- Long arc by high voltage and low ampere operation- Water cooled wall-panel to protect refractories 15.0 - 6.2 - - Productivity

increase 1.1 3.9 6.8- JP SteelPlantech- Nikko

3 A-13Bottomstirring/stirring gasinjection

- Inject inert gas (Ar or N2) into the bottom of EAF- Better heat transfer steel quality 18.0 - 7.5 - - Fe yield increase

0.5 % 1.4 0.2 0.3

- JP SteelPlantech

4 A-14 Induction typetundish heater

- Application of induction heating- Possible to uniformize temperature in 3 minutes afterpower supply

3.0 [*4] - - - - - - -

- FujiElectric

5 B-1

Exhaust gastreatment throughgas cooling, carboninjection, and bagfilter dedusting forEAF

- Improved design configuration of the direct evacuation fortreating hot unburned gas from much fuel use- Minimize dust and gas dispersion from EAF with enoughcapacity and suitable control - - - - Better workfloor

& environment - - 2.8 -


6 B-6 PKS charcoal usefor EAF

- Charcoal made from PKS can be used instead of injectedcoke into EAF. - - - - 39,000 ton-CO2/y

GHG reduction - - 0.7 -

- JP SteelPlantech

7 C-2EAF slagagglomeration foraggregate use

- Molten slag is rapidly cooled by jet air, and becomes 0.5 -3.0 mm heavy and strong ball.- Suited to use aggregate mixed with cement - - - - Slag satisfies the

safety code- Saved processingtime: 10 minutes - 0.7 -

- Nikko

8 D-4Fiber block forinsulation ofreheating furnace

- Low thermal conductivity- High temperature change response (low thermal-inertia)

- 0.02 - - Reduction of Heataccumulation - 0.8 1.4 3.6

- Chugai-Ro

9 D-5

Air conditioning byabsorption typerefrigerating byusing reheatingfurnace exhaust gas

- Use reheating furnace exhaust gas at the outlet ofrecuperator, about 300-350 degC

3.0 [*5] - 1.2 - - 0.2 0.6 5.4

- HitachiInfrastructure SystemsCompany

[*1] Opearation cost is indicated in minus (-)[*2] Co-benefits are not taken account into profits and operation costs[*3] Assumed investment cost is the revamping cost of existing conventional EAF[*4] Assumed plasma type tundish heater is installed. Effect is calculated comparing to electricity consumption of plasma type heater[*5] Compared to the air cooled electric chiller COP:3.5/ consider the auxiliaries consumption as 90kwh

Environmental benefitsID

Co-benefits

Assumedinvestment

cost

AssumedPayback

time

D. Energy Saving for Reheating Furnace

C. Material Recycle for Electric Arc Furnace

B. Environmental Protection for Electric Arc Furnace

<Remarks>Technologies listed below are either being interested to introduce in other ASEAN countries (Malaysia, Indonesia, Thailand, Singapore, and thePhilippines) or being recommended to introduce in Vietnam by Japanese steel experts. The list of these technologies would be your useful referenceto get an idea in case introducing new technoloies to steel plants in Vietnam.


Expected effects of introduction

MainJapanesesupplier

35



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference EPA-BACT (Sep. 2014), Diagram from JP Steel Plantech

8. Comments

<Preconditions on calculating effects and investment costs>- Values of "Electricity saving" and "Investment cost" are based on the EPA-BACT (Sep. 2014) & equipment supplier's rough estimation- "Profit" does not include such other advantages than electricity saving- Assumed investment cost is the revamping cost of existing conventional EAF





- Slag free tapping - Reliable stopping and scraping mechanism



15 kWh/ton-product

-

Increase in Fe & alloy yield, and productivityImprove steel quality


-

6.2 kgCO2/t-product


Eccentric bottom tapping (EBT) on existing furnaceItem Content


37



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference EPA-BACT ("Transformer efficiency - ultra-high power transformers"), Diagram from Nikko

8. Comments<Preconditions on calculating effects and investment costs>- "Electricity saving" 15 kWh/ton-product comes from EPA-BACT, assuming that 44 MVA transformer for 80 ton EAF is revamped to 55 MVA.



6. Japanese Main Supplier JP Steel Plantech, Nikko


In the conventional system, series reactor was used for the early melting stage in order to stabilize arc and control of a flicker.Since High-Efficiency Furnace Transformer provides high impedance at early melting stage, series reactor is not required,though the same performance is achieved.- Reduce electric power consumption- Reduce electrode consumption- Shorten tap to tap time



15 kWh/ton-product

-

Increase productivity


-

6.2 kgCO2/t-product


Ultra high-power transformer for EAFItem Content


The Impedance characteristics of Transformer

38



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference EPA-BACT, May contact to JP Steel Plantech

8. Comments <Preconditions on calculating effects>- "Electricity saving" 15 kWh/ton-product comes from EPA-BACT

4. Assumed Investment Cost 0.2 million US$ (assumed 80 ton EAF revamping)




- Inject inert gas (Ar or N2) into the bottom of EAF- Better heat transfer steel quality



18 kWh/ton-product

-

Fe yield increase 0.5 %


-

7.5 kgCO2/t-product


Bottom stirring/stirring gas injectionItem Content


39



・CO2 Reduction


・Co-benefits

・Profit 0.2 US$/ton-product (assumed electricity price = 0.077 US$/kWh)

-


Induction type tundish heaterItem Content


-

4. Assumed Investment Cost Not Announced



- Application of induction heating- Realizing 90 % heating efficiency- Possible to remove inclusion within molten steel- Step control method- Possible to uniformize temperature in 3 minutes after power supply- Temperature control with high accuracy through temperature feedback



3 kWh / ton-product (Effect is calculated comparing to electricity consumption of plasma type heater)

-

Productivity increaseQuality improvement

6. Japanese Main Supplier Fuji Electric7. Technologies Reference May contact to Fuji Electric

8. Comments

<Preconditions on calculating effects>- Assumed plasma type tundish heater is installed- Ladle capacity: 200 ton- Operated days: 30 days/month- Electricity intensity of heater: 13.7 kWh/ton- Heat efficiency: 70%- Pouring amount: 2.5 ton/min- Dissolution time: 80 min/charge- Rised temperature: 40 degeree C- Number of charges: 8 charges/day- Monthly production: 48,000 ton- Annual production: 576, 000 ton

40



・CO2 Reduction


・Co-benefits

・Operation Cost

7. Technologies Reference SOACT 2nd Edition, Diagram from Daido Steel

8. Comments <Suitable site>Enough evacuation capacity for 30 m3N/ton O2, 20 m3N/ton NG, and 15 kg/ton carbon





- Improved design configuration of the direct evacuation for treating hot unburned gas from much fuel use- Minimize dust and gas dispersion from EAF with enough capacity and suitable control- Much fossil fuel use becomes possible to save electricity.



-

-

-

Not Announced

Better workfloor environment

-


Exhaust gas treatment through gas cooling, carboninjection, and bag filter dedusting for EAF

Item Content


41



・CO2 Reduction


・Co-benefits

・Operation Cost

7. Technologies Reference Diagram from JP Steel Plantech, May contact to JP Steel Plantech

8. Comments

<Preconditions on calculating effects>Replaced coke at EAF : 25 kg/ton-steelC content in coke : 85 %CO2 generation from coke = 0.85 x 44 / 12 = 3.12 ton-CO2/ton-cokeGHG reduction = 500,000 ton-steel/y x 0.025 x 3.12 = 39,000 ton-CO2/y





- Charcoal made from PKS (Palm Kernel Shell) has similar quality with coke commonly used for carbon injection into EAF- Higher heating value, lower sulfur content than fossil fuel coke- CO2 generated from charcoal is not counted as GHG (Green House Gas)- PKS charcoal is produced for the production of activated carbon in a small scale- Equipmet is very simple and can be constructed by local technology- Japanese supplier will provide with know-how



-

-

-

Not Announced

39,000 ton-CO2/y GHG reduction from 500,000 ton/y EAF plant

-


PKS charcoal use for EAFItem Content


42


・Thermal EnergySavings -

・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from Nikko, May contact to Nikko

8. Comments

<Notice>When using this technology, slag analysis data should be confirmed to meet the environmental regulation<Preconditions on calculating effects>- Slag generation : 80 kg/ton-product- Yield of granulated slag with this process : 60-70 %


6. Japanese Main Supplier Nikko


Molten slag is rapidly cooled by jet air, and becomes 0.3-5mm size of spherical structure,-Create strong & heavy fine aggregate material for concrete-Enviromental friendly material-Suitable & meet with JIS A 5011-4 for Electric arc furnace oxidizing slag aggregate.-Require smaller space than normal slag treatment area.



Reduce disposal cost of industrial wasteProcessing time for one heat of EAF : 10 minutes

Not Announced

4. Assumed Investment Cost 0.7 million US$ for 2 ton/h plant (on-site in 500,000 ton/y EAF plant)

-

-

-

C-2 C. Material Recycle for Electric Arc Furnace

EAF slag agglomeration for aggregate useItem Content


Treatment Process for Electric Arc Furnace Slag Air

43



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from Chugai Ro, May contact to Chugai Ro

8. Comments

<Preconditions on calculating effects>assumed surface area of 100 ton/h furnace : 1350 m2atmosphere temperature : 30 degCsurface temp. and heat loss of brick lining case : 110 degC, 5.91 GJ/hsurface temp. and heat loss of brick lining case : 70 degC, 2.47 GJ/h(5.91 - 2.47) /100 (ton/h) = 0.344 GJ/ton





Furnace roof, wall and charging end face shall be insulated with ceramic fiber block. - Steel plate shall be equipped with the furnace roof and ceramic fiber block shall be installed. - Furnace wall has the existing steel plate and ceramic fiber block shall be installed on it.



-

0.02 GJ/t (about -2%)

-


Reduction of Heat accumulation

Not Announced


Fiber block for insulation of reheating furnaceItem Content


44



・CO2 Reduction


・Co-benefits

・Profit

7. Technologies Reference Diagram from HITACHI Infrastructure Systems Co., May contact to HITACHI Infrastructure Systems Co.

8. Comments <Preconditions on calculating effects>- compared to the air cooled electric chiller COP:3.5/ consider the auxiliaries consumption as 90kWh

4. Assumed Investment Cost 0.6 million US$ for 100 ton/h reheating furnace (only equipment)


6. Japanese Main Supplier HITACHI Infrastructure Systems Co.


This is a waste heat recovery system by using the absorption chiller.If there is a waste heat more than 200 deg. C , it can utilize for the double effect absorption chiller and can generate chilledwater for air conditioning, etc. This chiller efficiency is about COP*:1.45 and it can reduce electrical type chiller powerconsumption. It requires close attention in case the exhaust gas contains corrosive components.*COP(Coefficient Of Performance) : Heat supplied(W) / Power consumption(W)



3.0 kWh/ton-product (compared to the air cooled electric chiller COP:3.5 / considering the auxiliaries consumption as90kWh)

-

-

0.2 US$/ton-product US$/y income based on 5,000 hour operation in one year (Rounded off to one decimal place)

-

1.2 kgCO2/t-product

D-5D. Energy Saving for Reheating Furnace

Air conditioning by absorption type refrigeratingby using reheating furnace exhaust gas

Item Content


45

Company Contact Points Technology

Chugai Ro Co., Ltd. Akira SHINOZUKAOverseas Sales Sect, Sales Dept, Plant DivisionAddress: Sakai Works, 2-4 Chikko Shinmachi, Nishi-Ku,Sakai 592-8331, JAPANEmail: [email protected]: +81-72-247-2108

A-9. Low NOx regenerative burner system for ladle preheatingA-10. Oxygen burner system for ladle preheatingD-1. Process control for reheating furnaceD-2. Low NOx regenerative burner total system for reheating furnaceD-3. High temperature recuperator for reheating furnaceD-4. Fiber block for insulation of reheating furnace

Fuji Electric Co., Ltd. Masato IDEAssistant General Manager, Sales Dept. IV, Global PlantSales Div., Sales GroupAddress: Gate City Ohsaki, East Tower 11-2, Osaki 1-Chome, Shinagawa-Ku, Tokyo 141-0032, JAPANEmail: [email protected]: +81-3-5435-7062

A-14. Induction type tundish heater

Hitachi, LtdHitachi InfrastructureSystems Company

Taisuke SHIMAZAKIAssistant Manager, Industrial Systems and Solutions DivisionHeavy Industry Dept.Hitachi, Ltd. (Tokyo Head Office)Email: [email protected]: +81-90-1690-4507FAX: +81-3-5928-8745

D-4. Air conditioning by absorption type refrigerating by using reheating furnaceexhaust gasE-1. Inverter (VFD; Variable Frequency Drive) drive for motors

JFE EngineeringCorporation

Nagayoshi SUZUKIManager, Environmental Plant Sec., Engineering Department,Overseas Business SectorAddress: 2-1, Suehiro-cho, Tsurumi-ku, Yokohama, 230-8611JAPANEmail: [email protected]: +81(45)505-7821Fax: +81(45)505-7833

B-3. Dioxin adsorption by activated carbon for EAF exhaust gas

Nikko Industry Co.,Ltd.

Akiyoshi OKAMOTODirector, Engineering and Marketing DivisionAddress: 4-10, 2-chome, Nunobiki-cho, Chuo-ku, Kobe, 651-0097, JAPANEmail: [email protected]: +81-78-222-1688

A-3. High efficiency oxy-fuel burner/lancing for EAFA-5. Ultra high-power transformer for EAFC-2. EAF slag agglomeration for aggregate use

Nippon Furnace Co.,Ltd.

Susumu MOCHIDADirector, General Manager, Technology & EngineeringDivisionAddress: 1-53, Shitte 2-Chome, Tsurumi-ku, Yokohama 230-8666, JAPANEmail: [email protected]: +81-45-575-8008

A-9. Low NOx regenerative burner system for ladle preheatingD-2. Low NOx regenerative burner total system for reheating furnace

Contact Points of Supplier Companies

JP Steel Plantech Co. Masao MIKIGreen Business Dept. Sales & Marketing DivisionAddress: 3-1, Kinko-cho, Kanagawa-ku,Yokohama 221-0056JAPANEmail: [email protected]: +81-(0)45-440-5908Fax: +81-(0)45-440-5842

A-1. High temperature continuous scrap preheating EAFA-3. High efficiency oxy-fuel burner/lancing for EAFA-4. Eccentric bottom tapping (EBT) on existing furnaceA-5. Ultra high-power transformer for EAFA-6. Optimizing slag foaming in EAFA-7. Optimized power control for EAFA-10. Oxygen burner system for ladle preheatingA-11. Waste heat recovery from EAFA-12. Energy saving for dedusting system in EAF meltshopA-13. Bottom stirring/stirring gas injectionB-. Exhaust gas treatment through gas cooling, carbon injection, and bag filterdedusting for EAFB-2. Floating dust control in EAF meltshopB-3. Dioxin adsorption by mixing EAF exhaust gas with building dedusting gasB-4. Dioxin absorption by 2 step bagfilter technology for EAF exhaust gasB-5. PKS charcoal use for EAF

Daido Steel Co., Ltd Kunio MATSUOMelt Engineering Sect, Machinery Engineering Dept.,Machinery DivisionAddress: 9 Takiharu-cho, Minami-Ku, Nagoya, JAPAN, 457-8712Email: [email protected]: +81-52-613-6825

Katsunari HASHIMOTOAsean Area Manager. Machinery DivisionAdress: 1-6-35 Kounan, Minato, Tokyo, JAPAN, 108-8478Email; [email protected]: +81-3-5495-1282

A-2. Medium temperature batch scrap preheating EAFA-4. Eccentric bottom tapping (EBT) on existing furnaceA-6. Optimizing slag foaming in EAFA-8. Operation support system with EAF meltdown judgmentA-12. Energy saving for dedusting system in EAF meltshopB-1. Exhaust gas treatment through gas cooling, carbon injection, and bag filterdedusting for EAFB-2. Floating dust control in EAF meltshopB-4. Dioxin adsorption by mixing EAF exhaust gas with building dedusting gasB-5. Dioxin absorption by 2 step bagfilter technology for EAF exhaust gasC-1. EAF dust and slag recycling system by oxygen-fuel burner

47

TECHNOLOGIES CUSTOMIZED LIST version 1.0

For Technology Transfer to Vietnamese Iron and Steel IndustryWith regard to Energy-Saving, Environmental Protection, and Recycling

Documents

TECHNOLOGIES CUSTOMIZED LIST version 1 - jisf.or.jp · PDF fileTECHNOLOGIES CUSTOMIZED LIST version 1.0 ... dedusting system in EAF meltshop - Damper openings and exhaust fan rotation