Quality - Dust Control

7/30/2019 Quality - Dust Control

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DUST CONTROLDUST CONTROL


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DUSTDUST Dust is a very fine particle size (submicron) thatDust is a very fine particle size (submicron) that

easy to airborne.easy to airborne. The National Ambient Air Quality StandardThe National Ambient Air Quality Standard

(NAAQS) have targeted PM 10 ((NAAQS) have targeted PM 10 (-- 10 micron10 micron

particulate) because these very fine particleparticulate) because these very fine particlerepresent the most serious health hazardrepresent the most serious health hazard

Process and Fugitive Dust are regulatedProcess and Fugitive Dust are regulated

pollutants.pollutants. The creation of Dust in industry is an unavoidableThe creation of Dust in industry is an unavoidable

results of operation, such as; Dumping, Crushing,results of operation, such as; Dumping, Crushing,

screening, conveying, discharging etc.screening, conveying, discharging etc.


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DUST IN COAL MININGDUST IN COAL MINING

INDUSTRYINDUSTRY

MINING PROCESS

COAL HANDLING CHAINCOAL HANDLING CHAIN


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COAL HANDLING CHAINCOAL HANDLING CHAIN

CRUSHER

(Cap.

Feeder Cap. 500 TPHCap. 500 TPH

TRANSHIPMENT POINT - GEAR VESSEL

CUSTOMER

(1 ,2 5 0 TPH)

C a p .50 0

TPH

Ca p .

500 TPH

RADIAL CONVEYOR

RADIAL CONVEYOR

LATI MINE


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COAL HANDLINGCOAL HANDLING

CHAINCHAIN

MiningMining -- ChargingCharging -- HaulingHauling DumpingDumping

CrushingCrushing StockpilingStockpiling BargingBarging --

TransshipmentsTransshipments

These Operation could be generate fineThese Operation could be generate finecoal, resulting Dust emission.coal, resulting Dust emission.

The longer handling chain, the more proneThe longer handling chain, the more prone

to generate of fine coal (dust).to generate of fine coal (dust).


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FACTORS OF COAL DUSTFACTORS OF COAL DUSTOCCURSOCCURS

COAL PROPERTIESCOAL PROPERTIES

HANDLING SYSTEMSHANDLING SYSTEMS

WEATHER / SEASONWEATHER / SEASON

ACCESS OF WIND AND WIND SPEEDACCESS OF WIND AND WIND SPEED


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HOW TO CONTROLHOW TO CONTROL

DUSTDUST

Minimizing coal handlingMinimizing coal handling

Use a proper equipments forUse a proper equipments for

handlinghandling

Suppress Dust occurs duringSuppress Dust occurs during

operationoperation


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DUST SUPPRESSANTDUST SUPPRESSANT Dry collection systemsDry collection systems

are very efficient, however, this technology isare very efficient, however, this technology iscapital intensive, high maintenance, andcapital intensive, high maintenance, andapplicable only to sources that can be enclosed.applicable only to sources that can be enclosed.

Water Spray systemWater Spray systemremains the most efficient and cost effectiveremains the most efficient and cost effective

means of dust control for both process andmeans of dust control for both process andfugitive dustfugitive dust

Chemical AgentChemical Agent

Have wide spread used in industries toHave wide spread used in industries tosuppress dust problemsuppress dust problem


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WATER SPRAYWATER SPRAY

SYSTEMSYSTEM The affectivity of water spray systems are relied on theThe affectivity of water spray systems are relied on the

nozzle used to spray water.nozzle used to spray water. There are several types of nozzle available which resultsThere are several types of nozzle available which resultsdifferent type of water sprays.different type of water sprays. VV--nozzlenozzle

Full cone nozzleFull cone nozzle

Fogger nozzleFogger nozzle

The efficiency of the water spray system has establishedThe efficiency of the water spray system has establishedthe following facts :the following facts : For a given spray nozzle, the collection efficiency for small duFor a given spray nozzle, the collection efficiency for small dustst

particle increases as the pressure increasesparticle increases as the pressure increases At a given pressure, the efficiency increases as the nozzle desiAt a given pressure, the efficiency increases as the nozzle design isgn is

changed so as to produce smaller droplets. Thus the smallerchanged so as to produce smaller droplets. Thus the smallerdroplet is more effective in knocking the small dust particle oudroplet is more effective in knocking the small dust particle out oft ofthe air.the air.


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The AerodynamicThe Aerodynamic

of water droplet and small dustof water droplet and small dust


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WATER SPRAYSWATER SPRAYS


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ULTRASONIC DUSTULTRASONIC DUST

SUPPRESSANT SYSTEMSUPPRESSANT SYSTEM

The system use water and compressed air to produceThe system use water and compressed air to produce

micron size droplet that are able to suppress respirablemicron size droplet that are able to suppress respirabledust without adding any detectable moisture to thedust without adding any detectable moisture to theprocess.process.

Generally the system consist of two main part. These areGenerally the system consist of two main part. These are

as follows :as follows : Air compressor unitAir compressor unit

Spray headers with pipelines and pumping systemSpray headers with pipelines and pumping system

The Ultrasonic Atomizing system generates dropletsThe Ultrasonic Atomizing system generates droplets

averaging 10 micron in size and is capable of suppressingaveraging 10 micron in size and is capable of suppressingsubsub--micron dust particles. (conventional spray systemmicron dust particles. (conventional spray systemgenerate droplets in average of 600 micron)generate droplets in average of 600 micron)


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NOZZLE DESIGNNOZZLE DESIGN

The Ultrasonic Atomizing Nozzle takes theThe Ultrasonic Atomizing Nozzle takes the

form of a whistle using compressed airform of a whistle using compressed airwhich accelerates through a convergewhich accelerates through a convergesection and expand to a diverge section intosection and expand to a diverge section into

a resonator chamber. This produce aa resonator chamber. This produce apowerful sonic shockwave.powerful sonic shockwave.

Droplets produced by sonic atomization areDroplets produced by sonic atomization are

small and relatively uniform in size, in thesmall and relatively uniform in size, in theorder of 10 micron, with a low mass and loworder of 10 micron, with a low mass and lowforward velocity.forward velocity.


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ARCH

FOGGER

SYSTEM


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CHEMICAL AGENTCHEMICAL AGENT

The usage of chemical agents have widely spreadThe usage of chemical agents have widely spread

in many industries to suppress dust problemin many industries to suppress dust problem

These chemical agent generally consist of polymerThese chemical agent generally consist of polymer

as a binder agent and surfactant to reduce surfaceas a binder agent and surfactant to reduce surface

tension between water and coaltension between water and coal

In General the type of chemical agent are fall intoIn General the type of chemical agent are fall into

two types, i.e.two types, i.e.

Wetting typeWetting type

Coating typeCoating type


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SURFACTANTSURFACTANT

Coal Surface

Surfactant


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POLYMER EMULSIONPOLYMER EMULSION

The polymer emulsion is a fine particle binder, andThe polymer emulsion is a fine particle binder, and

forms a coating layer on the coal surfaceforms a coating layer on the coal surface

Polymer Particle Moisture evaporation Polymer resin


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END OF PRESENTATIONEND OF PRESENTATION

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Quality - Dust Control