Water management cesc

CII National Award for Excellence in Water ManagementCII National Award for Excellence in Water Management

Titagarh Generating StationTitagarh Generating Station

About CESC Limited

CESCCESC Limited is a century old Limited is a century old company and currently is a flagship company and currently is a flagship

company of company of RPG EnterprisesRPG Enterprises

TToday CESC is serving oday CESC is serving 2.1 million2.1 million consumers across its licensed area, consumers across its licensed area, spread over 567 sq. km. in and around spread over 567 sq. km. in and around

the city of the city of KolkataKolkata..

CESC CESC hashas 44 Coal based Thermal Coal based Thermal Power Generating Stations with a total Power Generating Stations with a total

capacity of capacity of 1225 MW. 1225 MW.

CESC’CESC’ss Power Plants are among the Power Plants are among the

Top 10 performingTop 10 performing power plant of India power plant of India

New Cossipore

100 MW 100 MW 19491949

Titagarh

240 MW 240 MW 19821982

Southern

135 MW 135 MW 19901990

Budge Budge

750 MW 750 MW 19971997

Environment Policy of CESC Ltd.

CESC’s business objective is to produce maximum produce maximum uninterrupted, uninterrupted, power in cost effectivecost effective and and

environmental friendly wayenvironmental friendly way

1

CESC’s vision emphasizes on sustainable growthsustainable growth2

All the power plants of CESC being city basedcity based, the

company has undertaken various proactive proactive measuresmeasures in different areas of environment

management like emission management, water emission management, water management, solid waste management etc. management, solid waste management etc.

3

One of the key mission of CESC in water management is

““Implementing ‘Zero Discharge’ for process effluent”Implementing ‘Zero Discharge’ for process effluent”

4

About Titagarh Generating Station

• Commissioned in 1982. 1982.

• First PF station First PF station of the company.

• Capacity = 240 MW 240 MW ( 4 X 60 )

• Station operates at around 96% PLF96% PLF.

• Located on the bank of river Hooglyriver Hoogly, the river becomes the main source of water.main source of water.

• Around 10,500 m10,500 m33 of water is required per day per day for various processes. .

• One of theOne of the top performing top performing power plant in terms ofpower plant in terms of PLF PLF

Power Cycle Process

RIV

ER

Steps Towards Conservation of Water

Zero Discharge for Bottom Ash Handling SystemZero Discharge for Bottom Ash Handling System by modification of Ash Settling Area, installing Pumps & pipeworks and control system for water balancing

Zero Discharge for Aux. cooling system Zero Discharge for Aux. cooling system by installing Cooling Tower.

Zero Discharge for Process water systemZero Discharge for Process water system by erecting a Surge reservoir and installing PSF & ACF PSF & ACF at final Effluent Treatment Plant Outlet

Introducing Root ZoneTechnology Root ZoneTechnology for treatment of sewage.

Elimination of steam consumption by replacing steam for replacing steam for LDO atomization in boiler with Compressed LDO atomization in boiler with Compressed Air Air thus reducing DM water consumption.

1

2

3

5

4

Intake Pump HouseIntake Pump House

R

IVE

R H

OO

GLY

Towards Recycling of Effluent

CASE STUDY CASE STUDY Zero Discharge for Bottom Ash Handling SystemZero Discharge for Bottom Ash Handling System

1

Process Condenser

Cooling systemCW OutletCW Outlet

R

IVE

R H

OO

GLY

Process Ash

handling system

Ash Settling

Area Ash water Pp pit



Process Condenser

Cooling systemCW OutletCW Outlet


R

IVE

R H

OO

GLY

Process Ash

handling system

Ash Settling


Recirculation PumpProcess Condenser

Cooling system


ModifiedRECIRCULATION PUMPS for Bottom Ash Handling SystemRECIRCULATION PUMPS for Bottom Ash Handling System

Intake Pump House

R

IVE

R H

OO

GLY

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


Recirculation Pump


CASE STUDY CASE STUDY Zero Discharge for Process water systemZero Discharge for Process water system

2

Modified

Intake Pump House

R

IVE

R H

OO

GLY

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Process Aux.

CoolingSystem

Pump

PumpClariffloculator

Reservoir Makeup

Recirculation Pump


Modified

Intake Pump House

R

IVE

R H

OO

GLY

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Pump

Pump

Process Aux.

CoolingSystem

Clariffloculator

ReservoirMakeup

Cooling TowerCooling Tower

Recirculation Pump


ModifiedCOOLING TOWER COOLING TOWER

for Auxiliary Cooling Systemfor Auxiliary Cooling System

Makeup

Intake Pump House

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Pump

Pump

Process Aux.

CoolingSystem

Reservoir


R

IVE

R H

OO

GLY

Recirculation Pump

Clariffloculator

CASE STUDY CASE STUDY Zero Discharge for Process water systemZero Discharge for Process water system

3


Modified

Makeup

Intake Pump House

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Pump

Pump

Process Aux.

CoolingSystem

Clariffloculator

Reservoir


Process Blowdown /

Service Water

R

IVE

R H

OO

GLY

Recirculation Pump


Modified

ETPETP

Makeup

Intake Pump House

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Pump

Pump

Process Aux.

CoolingSystem

Clariffloculator

Reservoir


Process Blowdown /

Service Water

R

IVE

R H

OO

GLY

Recirculation Pump

SurgeTank

PSF

ACFM

akeu

p


Modified

ETPETP

SURGE TANK for Process Water RecyclingSURGE TANK for Process Water RecyclingPSF & ACF for Process Water RecyclingPSF & ACF for Process Water Recycling

Recirculation Pump

Makeup

Intake Pump House

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Pump

Pump

Process Aux.

CoolingSystem

Clariffloculator

Reservoir


Process Blowdown /

Service Water

R

IVE

R H

OO

GLY

SurgeTank

PSF

ACFM

akeu

pCASE STUDY CASE STUDY Root Zone TechnologyRoot Zone Technology

4


Modified

ETPETP

Recirculation Pump

Makeup

Intake Pump House

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Pump

Pump

Process Aux.

CoolingSystem

Clariffloculator

Reservoir


Process Blowdown /

Service Water

R

IVE

R H

OO

GLY

Mak

eup

Deep tube well

Wash & Toilet


SurgeTank

PSF

ACF

Modified

ETPETP

Recirculation Pump

Makeup

Intake Pump House

Process Condenser

Cooling system

Process Ash

handling system

Ash Settling


PHE

Pump

Pump

Process Aux.

CoolingSystem

Clariffloculator

Reservoir


Process Blowdown /

Service Water

R

IVE

R H

OO

GLY

SurgeTank

PSF

ACFM

akeu

p

Deep tube well

Wash & Toilet

Root Zone

Gar

den

ing


Modified

ETPETP

Root Zone System

Length of the Root Zone bed 16 MWidth of the Root Zone bed 10.5 M

Septic Tank

Pump

Garden

Pump

Root Zone System

Outlet ChamberInlet Chamber

Canna Plants

Tier isolating valves

From auxiliary steam

To Drain

CASE STUDY CASE STUDY DM Water ConservationDM Water Conservation

5

DM Water Conservation

Unit-2 Unit-3 Unit-4

Compressor

Pressure Control Valve

Replacing steam for LDO atomization in Replacing steam for LDO atomization in boiler with Compressed Air. boiler with Compressed Air.

Registered with UNFCCC on 22nd. June 2007. Elimination of consumption of steam: 10 ton/hr. at 10 kg/cm2 with 180 0C temp. Reduction of DM water:10 ton/hr. CERs Issued 158275 Received: Rs. 12.75 cores.

Cost & Savings

Overview on Cost & Savings of Implemented projects Overview on Cost & Savings of Implemented projects for Water savings & Environmental excellencefor Water savings & Environmental excellence

SlProject

Year of Implementa

tion

Annual Savings

(Water) m3

Annual Savings (Cost )

Rs. in Lakh

Investment Rs. Lakhs

Payback Period (Months)

1

Replacing steam for LDO atomization with Compressed Air

2006-07 87600 250 40 2

2

Zero Discharge System for station Effluent (Service water & Ash handling system)

2009-10 2774000 Not

applicable 122.61Environmental

excellence

3 Root Zone 2010Not

applicableNot

applicable 8.23Environmental

excellence

4 Cooling Tower for Aux. cooling System 2012-13 1227840 82.47 259.36 36

Specific Water Consumption

Specific Process Water Consumption for Power GenerationSpecific Process Water Consumption for Power Generation

FY

ProcessWater

Consumption (M3)

Production (Power

Generation)Million kwh

Specific WaterConsumption

m3 / MwhRemarks

2005 - 06 3661190 1830.5950 2Prior to Effluent

Recycling2006 - 07 3674430 1837.2150 2

2009 - 10 525600 1888.7906 0.9Recycling of Ash

Handling Sys & Process Water

2011 - 12 518707 1715.6021 0.3 (85% Reduction)

Cooling Tower (Full)

2012 -13 512125 1649.6400 0.3Initiation of Dry Fly

ash system

Domestic Water Consumption

Per-capita Domestic Water Consumption Per-capita Domestic Water Consumption

FY

DrinkingWater

Consumption (M3)

Source of water

Average Employees

per day

Per capitaConsumption(Per person / day (Liters)

2005 - 06 8835Ground Water

723 0.033


902 0.027


748 0.031


744 0.031

Anti Pollution InitiativesNo discharge of effluent from plant except rain water.

a) Zero discharge service water and bottom ash handling water b) Replacing plate heat exchanger with cooling tower. c) Root zone treatment for sewage

Reduction of water consumption by: a) Incorporation of level switches at overhead tanks to restrict misuse of ground water. b) Reduction of DM water by Replacing steam with air for Oil atomization in boiler. c) Display at strategic location to reduce wastage. d) Monitoring of boiler water to reduce blow down. e) Recycling of service water tank over-flown water through pump. f) Optimizing operation of CW pump w.r.t. condenser vacuum g) Reduction of running of ash water by replacing dry ash evacuation system

Monitoring

Monitoring For

Water Quality

Monitoring For

Water conservation

Testing of water sample Daily :

ETP Inlet

ETP outlet

EADA outlet

ACF Outlet

Clarified Reservoir

Cooling tower.

Monthly:ACF & EADA outlet are checked by WBPCB

Monitoring of performances of level switches

Level monitoring of cooling tower.

Optimization of CW Pumps operation through monitoring of Condenser vacuum

Flow control w.r.t clarified reservoir level.

Awareness Programmes

General Training of EMS at Titagarh for all employees.

Display of environment data at main entrance for general public.

Separate training for employees for maintaining Zero Discharge system.

Active participation of all employees in small improvement projects (KAIZEN) contest every year.

Active participation of all employees in “House keeping contest (Intra CESC)” every year.

Monthly meeting of environment committee (all section of employees)

Task force team for developing new idea for improvement on environment and implementing the same.

Awareness Programmes

Awareness of Contractors’ employees regarding environment before enlisting.

Awareness regarding optimum use of Ash Handling Water

WORLD ENVIRONMENT DAY celebrated on 5th. June, every year involving local community and WBPCB.

Participation in Environment related public fare (Parivesh Mela).

Imparting voluntary environmental education to local school children and organizing workshops in colleges

Community

Vendor

Certifications

ISO 9001:2000 ISO14001:2004 BS OHSAS 18001:2007

Thank Youvisit us at www.cesc.co.in

Water management cesc

Engineering

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