auxiliary power
TRANSCRIPT
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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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Thrust Areas for Energy Conservation
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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Thrust Areas for Energy Conservation
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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Thrust Areas for Energy Conservation
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.