auxiliary power

8/13/2019 Auxiliary Power

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Auxiliary power consumption in athermal power plant is a major source ofenergy consumption.

During 2007-08, total generation by coalplants 488157.46 MUs

PLF of 78.75 % and average auxiliarypower consumption as 8.17 %


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If steps could be taken to reduce thisAPC to only 8 %, it will help inavoiding fresh capacity addition of aunit of 120 MW size.

Thus APC reduction initiatives notonly reduce energy consumption butalso ensure more revenue because ofincrease in energy export.


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Steps adopted for APC reduction

Energy Management System in NTPC : Conducting energyaudit in a structured manner and implementation of action plan& Check Audits

Other Thrust Areas for Energy Conservation: On line monitoring of power consumption of various auxiliaries

through OLEMS Monitoring the power consumption of each equipment beforeand after overhaul

Introduction of latest state of the art technologies on specificsystems without waiting for R&M of the whole power plant

Better O&M practices

Introduction of VFDs Energy efficient coating of the pumps


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NTPC installed capacity: 27912 MW

Generation 2007-08 : 200864 MU

Coal Based generation : 176818 MU

Gas Based generation : 24046 MU


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To widen the ambit of energy conservation, agroup named Centre for Energy EfficientTechnology & Energy Management has been established in Corporate Centre withmandate to oversee and coordinate intotality, different energy saving efforts in thepower plants including energy audits.

Energy Managem ent at NTPC


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Energy Management at NTPC

To comply with Energy ConservationAct 2001, all NTPC power plantshave designated Heads of Energy

Efficiency & Management Group(EEMG) as Energy Manager.


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Energy Management at NTPC

EEMG groups are dedicated to monitordifferent energy efficiency parameters ofpower plant including implementation of

different energy conservation measures in thepower plant

NTPC formulated and adopted the EnergyManagement Policy in the year 2004.
http://localhost/var/www/apps/conversion/tmp/scratch_5/EMP.doc


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Energy Management System in NTPC

Energy Audit System

Installation of On Line Energy Monitoring System

Study and application of innovative energy efficienttechnologies

Organising mass awareness programs in NTPC townships

EETEM

On account of different efforts toward energy conservation,NTPC could save various forms of energy amounting to aboutRs.180 Crores during the 10th five year plan

NTPC an Energy udit Company

EETEM


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In any thermal power plant

Energy Inputs

Fuel i.e. Coal or Natural Gas

Electrical Power (Aux. Power) Energy Output

Electrical Power

Efficiency ParametersHeat rate Kcal / KWh

Aux Power Consumption %

EETEM


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For overall monitoring these parametersare OK but due to complexity of the totalprocess involved and for effective auditing,total process needs to be divided into manysub systems

EETEM


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Energy Audit System includes

Identification of sub systems of total process

Preparation & Review of Energy Audit Procedures

Preparation of Annual Energy Audit ScheduleConduct of Energy Audits

Preparations of Reports indicating recommendations, savingpotential and action plan

Follow up the action plan

EETEM

Energy Audits System


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Objectives of Energy Audit Identifying potential areas of energy savings

Finding avoidable Wastages if any

Fixing energy saving potential target

Drawing time bound action plan for implementation

Assessing the sustainability of implementedrecommendations

List out expenditure in proposed action planalong with payback period

EETEM


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Energy Audit indicates

Where and how energy is being used

Energy Saving Potential

Energy Audit includesWalk though survey

Recording of energy consumption data for major equipments

Analysis of energy consumption data

Comparison with base line for energy consumption data

EETEM

Energy Audits System


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Boiler

Boiler efficiencyDraft systemMilling SystemThermal Insulation

TurbineTurbine efficiencyRegenerative system

Sub Systems in thermal power plant

EETEM


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Electro Static Precipitator

CW system and Cooling Tower

Coal Handling Plant

Ash Handling Plant

Merry Go Round System

EETEM


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Compressed Air System

Water Balance

Air Conditioning and Ventilation System

Lubricating Oil

EETEM


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Thrust Areas for EnergyConservation

On Line Energy Management SystemAnything cant be controlled if it is not measuredTo control and closely monitor the electrical powerconsumption of different subsystems of the power plants,existing stations are in the process of installing on-line energymanagement system. The system is planned to be introduced inall future NTPC power plants .Merit order operationShift in maintenance practicesOLEMS system will help in monitoring system wise energyconsumption


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Thrust Areas for Energy Conservation

Monitoring of power consumptionof major equipments and estimatingthe gains through overhaul.

Generating the trends for thedeterioration in the performance inthe such equipments.


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Better O&M Practices asMinimizing Feed Regulating

Station Differential PressureStopping CW pumps at low ambienttemperatureOn/Off line compressor washing inGas stations.


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Using Variable Frequency Drives for HTdrives ( wherever flow control is achieved

by Inlet guide vane / inlet damper / valve)

Promoting vapour absorption system inplace of vapour compression for air

conditioning to prevent the use offlourocarbons


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Coating of internals of large water pumps(CW pumps, Ash water pumps etc.)There is energy saving potential of 4 %

through polymer coating on pumpinternals with payback of less than 01year.This is achieved due to reduction infrictional losses


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Compilation of Annual Energy Savings

Savings due to operating practices Savings due to equipment

maintenance. Savings due to system modification or

replacement by efficient equipment

Based upon sustainability of the ECmeasure annual saving is worked out

EETEM


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To update the knowledge in the area of existingsavings potentials through energy conservation in

different fields of power plants, topic specificworkshop on Potentials of Energy Savings indifferent areas of the power plants is organizedannually.

Participation is encouraged from differentequipment designers, manufacturers, academiciansand utilities including NTPCs power plants andnear by IPPs / State Gen Cos in such workshops.

Energy Con servat ion Kn ow ledge shar ing

EETEM


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ADOPTION OF IMPROVED SUB-CRITICAL PARAMETERS OF 150KSC/ 5370C/5650C FOR 500 MW UNITS.

660 MW UNITS WITH SUPER CRITICAL PARAMETERS OF 247KSC / 5370C/ 5650C INTRODUCED AND ALREADY UNDERCONSTRUCTION.

PLANS TO INTRODUCE HIGHER SIZE UNITS OF 800 MW.

DEVELOPMENT OF INTEGRATED COAL GASSIFICATIONCOMBINED CYCLE (IGCC) TECHNOLOGY SUITABLE TOINDIAN COAL THROUGH ITS COLLABORATIVE EFFORT WITHUSAID

Technology Initiatives


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765 KV TRANSMISSION, ADVANCED CLASS GTS ARESOME OF THE TECHNOLOGIES BEING INTRODUCED.

THE COMPANY SETS ASIDE UPTO 0.5% OF THE PROFITS

FOR R&D

ENERGY TECHNOLOGIES CENTRE IS WORKING IN BOTHFUNDAMENTAL AND APPLIED FIELDS AND HAS AWELL-DEFINED MANDATE TO DEVELOP VARIOUSTECHNOLOGIES WHICH WILL ENHANCE PLANTRELIABILITY, EFFICIENCY ETC.

Technology Initiatives

EETEM


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ConclusionNTPC intends to bring down its APC through specificefforts towards energy conservation to bring down itsenergy intensity and generation cost.

EETEM


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DISCLAIMERThe information contained in this document relating to projections and estimates areforward looking statements based on existing laws & Regulations. Actual result may

vary materially from those expressed or implied, depending upon economic conditions,government policies and other incidental factors. Any opinion expressed is given in

good faith but is subject to change without notice. No liability is accepted whatsoeverfor any direct or consequential loss arising from the use of this documents.

Website : www.ntpc.co.in

FORMAT FOR COMPILATION OF ENERGY SAVINGS (MONTHLY)


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System wise energy savings

FORMAT FOR COMPILATION OF ENERGY SAVINGS (MONTHLY)

(Stations having functional On Line Energy Management System)

Unitno./ System

Energy Energy consumed

Energyconsumed Savings/ loss If savings / loss,

Station Unit previous month current monthover previous

monthInitiatives undertaken / actionsrequired

(MU)

Kwh / Mwhgenerated

(MU)

Kwh /Mwhgenerated

(+/-)kwh/mwh

(+/-)Rs.inlacs

U# FW system MU

(BFP's)

U# Draft System

(ID's + FD's + PA's)

U# Milling * *

(All Mills)

U# Condensate System

(CEP's + Drippumps)


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Energy Savings achieved due to specific effortstowards Energy Conservation

S.

NO

.

A

RE

A

ACTIVITIES

TYP

E OF

ENE

RGY

UNI

TS

R

AT

E

Quantity Totalsavings

achievedduring the

year(Rs.inLacs)

Expenditure incurred

(Rs. InLacs)

Savings dueto Maints to

be c/f to2009-10

Savingsdue toOperatingPractice

Savingsdue toEquipment Maints

Savings dueto systemmodi./replacementby efficienteqpts.

auxiliary power

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