INTRODUCTION ELECTRIC ARC & LADLE REFINING FURNACE

DOSHI TECHNOLOGIES (P) LTD.www.doshiassociates.net

Doshi Technologies (P) Ltd.INTRODUCTION

ELECTRIC ARC & LADLE REFINING FURNACE

ELECTRIC ARC FURNCEAND

LADLE REFININGFURNACE

SALIENT FEATURES Compact design with minimum space requirements User friendly for ease of operation and maintenance. Low refractory wear due to small pitch circle diameter Tubular Roof Design Exact guidance of electrode mast with self-centering guide rollers Positive Clamping For Electrode to ensure Zero Slippage User-friendly digital electrode regulation system Designed for metal movement by transfer trolley or with gantry

swiveling arrangements. Furnace operations and control are automated with PLC and

computer based Human Interface which are very friendly to operateand maintain.

From conceptualization to commissioning, under one roof. In house manufacturing facilities.

3DOSHI TECHNOLOGIES (P) LTD.

www.doshiassociates.net

DESIGN CONCEPT FOR LRFEstimated Cycle Time – LRF :Ladle positioning on the ladle car : 1.5minLadle car travel & Roof lowering on the ladle : 1.5minTemperature measurement & sampling : 2.0minFerro-alloys and flux addition : 6.0minTemperature raising : 20.0minWire feeding (if required) : 2.0minFinal temperature raising and sampling : 2.0minFinal adjustment for homogenization : 2.0minRoof lifting after treatment and ladle car travel : 1.5minLadle lifting from the ladle car (Approx.) : 1.5minTotal Cycle Time : 40.0min

LIST OF INSTALLATIONSCUSTOMER FURNACE TYPE CAPACITY

MAHINDRA UGINE STEELCO. LTD, KHOPOLI

LADLE REFINING FURNACE 50 MT / 10 MVA

USHA MARTIN LIMITED,JAMSHEDPUR

LADLE REFINING FURNACE 40MT / 6 MVA

SHAIFALI ROLLS LIMITED,GANDHIDHAM

SUNFLAG IRON & STEEL CO.LTD, NAGPUR

LADLE REFINING FURNACE 60MT / 11 MVA

AMRELI STEELS LIMITED,KARACHI PAKISTAN

LADLE REFINING FURNACE(UNDER COMMISSIONING)

30 MT / 6 MVA

BSRM IRON & STEEL MILLS,CHITTAGONG, BANGLADESH

CEW, LUCKNOW ELECTRIC ARC FURNACE 5 MT / 2.4 MVA

FRONTIER ALLOYS &STEELS LTD, PAONTA SAHIB

ELECTRIC ARC FURNACE 3MT / 1.5 MVA

LIST OF INSTALLATIONSCUSTOMER FURNACE TYPE CAPACITY

R L ENERGY & STEELS LTD.AURANGABAD

ELECTRIC ARC FURNACE 25 MT / 15 MVA

ADHUNIK METALIKSROURKELA

LADLE REFINNING FURNACE 30 MT / 5 MVA

INDSUR USA, SAUDIFOUNDRY PROJECT

ELECTRIC ARC FURNACE 5 MT / 2.4 MVA

KSRM IRON & STEELROLLING MILLSCHITTAGONG BANGLADESH

ABHIJEET GROUP –CORPORATE ISPAT,JAMSHEDPUR

2 NOS. X LADLE REFINNINGFURNACE

35 MT / 7 MVA

KAMALJEET SINGHAHLUWALIA KEONJHAR,ORISSA

LADLE REFINNING FURNACE 18 MT / 3.6 MVA

MITTAL CORP LIMITED,INDORE

CALCUTTA SPRINGSLIMITED

ELECTRIC ARC FURNACE 5 MT / 2.4 MVA

ELECTRIC ARC FURNACESHOP ASSEMBLIED

Compact designwith minimumspacerequirements

User friendly forease of operationand maintenance.

Low refractorywear due to smallpitch circlediameter

MAST ASSEMBLY WITH ELECTRODE HOLDING ARMS

DOSHI TECHNOLOGIES (P) LTD.www.doshiassociates.net 8

ELECTRODE HOLDING ARMSWith Working Platform & Bus Tubes

Smallest PossiblePCD for a givenElectrode size.

Electrode Holders areWater Cooled.

Positive Clampingtype ElectrodeGripping cylinder –Spring Loaded.

Copper Bus Tubes onArms

Insulated & Rigid ArmHolding & AdjustingBolts.

Integrated Workingplatform

LADLE FURNACESALIENT FEATURES

POSITIVE SLIP FREE ELECTRODECLAMPING BY SPRING LOADEDHYDRAULIC CYLINDER

PRISMATICALLY GUIDED MASTASSEMBLY FOR MINIMUM JERKAVOIDING ELECTRODE BREAKAGE

IN HOUSE MANUFACTURING ANDPREDESPATCH ASSEMBLY

IN HOUSE MANUFACTURING AND PRE-DESPATCH ASSEMBLY

MINERAL OIL BASED HYDRAULICSYSTEM

Hydraulic Pumps are specifically chosenfor mill duty application and reducedpower consumption.

Accumulator design is proven for smoothhydraulic operation as againstconventional pressure vessel design.

The proportional control valve are withfeedback control for better electroderegulation.

Accumulator design is proven for smoothhydraulic operation as againstconventional pressure vessel design.

HYDRAULIC POWER PACK WITH PROPORTIONALCONTROL VALVES & ACCUMALOTORS

High PressureHydraulic system withProportional controlvalve.

Valves with On Boardamplification & signalcontrol cards.

Piston Accumulatorsfor Normal &Emergency operation.

100% Standy Pumpswith motors.

Complete withInterconnecting piping& accessories.

COMPLETE HIGH PRESSUREHYDRAULIC POWER PACK WITH

PROPORTIONAL CONTROL VALVE,PUMPS & OTHER COMPONENTS.

PLC BASED FURNACE CONTROLSYSTEM.

FURNACE IS OPERATED FROMCOMPUTER BASED HMI

SCADA ON HMI DISPLAYS ALLOPERATION AND CONTROL FEATURE

DOSHI TECHNOLOGIES PRIVATE LIMITED,INDIA

DOSHI TECHNOLOGIESPRIVATE LIMITED, INDIA

PLC BASED CONTROL PANEL FOR EASEOF OPERATION, DIAGONSIS AND MIS

ELECTRODE REGULATIONCurrentArc StabilityActive Power InputElectrode ConsumptionRefractory ConsumptionEnergy Consumption

Electrode MovementsSetpoint keepingSafety Functions

Functions of a classical electrode control system

Measurement of Voltages and CurrentsImpedance RegulationSet-Point Memory

Overcurrent LimitationTouch Down Stop

PLC BASED CONTROL PANEL WITH PC BASED HMI

OPERATOR CONSOLE WITH HMI PLC based Furnace

Control System. Computer Based HMI

with screen to operateand control the furnacefrom control pulpit.

User friendly, provenelectrode regulationsystem interfaced withfurnace controls &protection system.

Can be connected toexisting ManagementInformation System.

6 MVA - 30 MT LRF ERECTED AT SITE

DEPENDING OF SHOP LAYOUT, ROOFSWING OR FIXED ROOF TYPE LRFOFFERED.

FIXED ROOF TYPE LRF COMES WITHROOF LIFTING & LOWERING ANDLADLE TRANSFER CAR FOR LADLEMOVEMENT.

LADLE REFINING FURNACE

LAYOUT FOR LRF 3D MODEL

LADLE TRANSFER CAR

LADLE TRANSFER CAR WITH TILITNG ARRANGEMENT FOR DE-SLAGGING

ARGON OR NITROGEN PURGING SYSTEM FOR LRF

SECONDARY LOW VOLTAGE DELTA –FURNACE TRANSFORMER

SUB ASSEMBLIESFOR EAF AND LRF

ELECTRODE HOLDING ARMS WITH COPPER BUS TUBES &HYDRAULIC CLAMPING CYLINDER

DOSHI TECHNOLOGIES (P) LTD.www.doshiassociates.net 37

FUME EXTRACTION DUCT FOR 110 MT EAF

WATER COOLED ROOF FOR 60 MT EAF

WATER COOLED ROOF - EAF –SHELL INNER DIA. 3600MM

WATER COOLED ROOF EAF

WATER COOLED ROOF 30 MT LRF

MAST ASSEMBLY WITH GUIDE ROLLERS &HYDRAULIC CYLINDERS FOR LRF

MAST ASSEMBLY WITH GUIDE ROLLERS & HYDRAULICCYLINDERS FOR LRF

INDUCTION FURNACESPARES AND

ACCESSORIES

INDUCTION FURNACETILTING SHELL

INDUCTION FURNACE SHELL ASSEMBLEDWITH COIL, YOKE & TILTING CYLINDER

INDUCTION COIL

ACCESSORIES FORSTEEL PLANT &

FOUNDRIES

SCRAP CHARGING BUCKETS• Environment Friendly

• Detachable Bail Arm

•Suitable for Induction FurnaceCharging

•Increases productivity

•Reduces the use of Shop Craneand hence increases itsavailability

•Can be used with all kinds ofscrap

•Reduces no. of charges

INTRODUCTION ELECTRIC ARC & LADLE REFINING FURNACE

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