Durgapur Steel Thermal Power StationDVC, Andal

Abhishek GoraiRoll – 12/ME/13Mechanical EngineeringNational Institute of TechnologyDurgapur

About

▪ Situated at Andal, Durgapur, W B (co-ordinates 23°34'48"N, 87°12'19"E)

▪ Installed Capacity : 2x500 MW

▪ Running Capacity :350 MW (1x140 + 1x210 MW)

Overview

Chemical Energy (Fuel)

Heat Energy (Steam)

Mechanical Energy (Rotation of

Turbine)

Electrical Energy

Fuel

Water

Air

Combustion

Steam Generation

Treatment

Conditioning

CoalOil

Heat

DM Plant

Power Generation

Turbine Generator

Flue Gas

Cooling System

Wastewater

Water PackagingSource of Raw Water : Damodar RiverWater Requirement: To provide make-up water to the water/steam cycle. For cooling of the steam for re-use as condensate. For general domestic use.

RESERVOIR AERATOR

DM PLANT

BOILER MAKE-UP

CW MAKE-UP DMF

POTABLE WATER

GRAVITY FILTER

CLARIFLOCCULATOR

Water Packaging : De-Mineralization Plant

Activated Carbon

Filter

Strong Acidic Cation

Exchanger

Degasser

Tower

Strong Basic Anion Exchanger

Mixed

Bed

Ultra Filtration

SKID

DM Water

Storage Tank

Coal Handling Plant (CHP)▪ Track Hopper▪ Wagon Tippler▪ Crusher House▪ Stacker-cum-Reclaimer▪ Conveyor Belts▪ Raw Coal Bunker

Coal Mill (Pulverizer)

▪ Supplies pulverized coal as per steam generation requirement

▪ Facilitates combustion by pre-combustion drying up.

▪ Separates incombustibles.

DSTPS has 10 Bowl Mills for each boilerName : 803XRP

Boiler▪ Steam is generated from DM water by heat addition to

DM water at constant pressure & temperature.Boiler Description at DSTPS, Andal▪ Top supported, fusion welded▪ Vertical water-tube boiler▪ Controlled Circulation▪ 4-corner tilting tangential firing

Boiler Mountings▪ Pressure Gauges– For measuring pressures at various points

▪ Valves– For safety, and to maintain unidirectional flow

▪ Water Level Indicator– For optimum running of boiler

▪ LRSB (Long Retractable Soot Blower)– For cleaning soot from boiler’s inner surfaces

▪ Tapping and Manholes– Maintenance Purpose

Boiler Accessories

▪ Air Preheater– Air is pre-heated by flue gases to ensure complete combustion of even

low-grade fuel, like Lignite.

▪ Economizer– Feed-water is heated by the outgoing flue gases before entering boiler

drum.

▪ Superheaters– Steam is heated to higher temperature to ensure dryness fraction

remains above 0.8

▪ Reheaters– Steam is reheated between HPT and IPT, and again between IPT and LPT

Turbines▪ 3 turbines : HP, IP, and LP▪ High Pressure Turbine (HPT)– 17 stages

▪ Intermediate Pressure Turbine (IPT)– 12 x 2 stages

▪ Low Pressure Turbine (LPT)– 6x2 stages

▪ 3000 RPM▪ Heat Rate : 1944.4 kcal/kWh

Generator and Exciter

▪ Generates electrical power by the interaction of the rotating magnetic fields of the stator and rotor

kW: 500000 Speed: 3000 RPMkVA: 588000 Frequency: 50 HzP.F.: 0.85 Lag Coolant: H2 and H2OMade at BHEL, Haridwar▪ Brushless excitation system

Auxiliaries

▪ Regenerators– HP Heaters (3 nos)– LP Heaters (3 nos)

▪ Boiler Feed Pump– Pressurizes feed water from De-

aerator before entering into boiler– Turbine Driven Boiler Feed Pump▪ works with steam extracted from IP

turbine exhaust.– Motor Driven Boiler Feed Pump▪ works with a motor. HP Heater

Condenser▪ A shell and tube type

surface heat exchanger.▪ Cooling water flows

twice through the tubes.▪ Steam condenses by

giving up heat and is collected at the hot well below.

▪ Maintained at 45˚C and little below atmospheric pressure.

Cooling Towers

▪ The heated cooling water after passing through the condenser, is brought to the cooling towers.

▪ Heat is given out in the atmostphere.

▪ The water is recirculated back as cooling water.

Ash Handling Plant

▪ Ash is categorised into :– Bottom Ash▪ collected at the bottom of the boiler

– Fly Ash▪ collected at the Electro-Static

Precipitator

▪ It is transported in the form of slurry

▪ Ash is either given away to cement factories, or is stored in Ash dykes.

Control and Automation

▪ Highly Automated by use of PLC controllers

▪ Control Rooms :– Boiler Control Room– CHP Control Room– Switchyard Control Room

Conclusion▪ The practical experience I have gathered during the

overview training of this thermal power plant in two weeks will be very useful as a stepping stone in building bright professional career in future life.

▪ It gave me large spectrum to utilize the theoretical knowledge and to put it into practice.

▪ The trouble shooting activities in operation and decision making in case of crisis made me more confident to work in the industrial atmosphere.

Thank You