1 energy efficiency improvement in the power sector presentationby bhel - corporate engineering...
TRANSCRIPT
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ENERGY EFFICIENCY IMPROVEMENT ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORIN THE POWER SECTOR
PresentationPresentationby by
BHEL - Corporate Engineering &BHEL - Corporate Engineering &Product DevelopmentProduct Development
5 June 20085 June 2008
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Improvements in existing technologies such as sub-critical power plants and hydro power plants.
Introduction of supercritical and ultra supercritical power plants.
Introduction of advanced technologies such as Integrated Gasification Combined Cycle plants or IGCC.
ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
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Initiative - New materials and availability of advanced engineering techniques such as FEM, CFD, Simulation, etc., running on faster and cheaper computers .
Development of more efficient aerodynamic blade profiles and re-designing the inlet and outlet sections using modern CFD techniques.
Improved cycle introduced - increasing steam parameters like main steam pressure, main steam temperature and hot reheat temperature or improving the internal efficiency by reducing losses in the steam turbines
ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
Improvements in existing technologiesSteam Power Cycle
1 kcal/ kWh reduction in TG cycle heat rate, coal consumption reduces by 300 and 700 tonnes per year for 210 and 500 MW sets.
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Losses restricted by employing more effective inter-stage sealing and shaft sealing by keeping radial clearances to the minimum.
New Rating Developed - A new cost effective and thermodynamically efficient plant with a unit rating of 600 MW.
ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
Improvements in existing technologiesSteam Power Cycle
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Use of aerofoil bladed PA fans, with inlet guide vane control in place of damper control - reduced fan losses. Replacement of worm gear by planetary gear in pulverisers has improved their energy efficiency.
Efficiency of boiler feed pumps - Enhanced by one percent through thermo hydraulic re-design
Use of variable speed drives with ID fans and BFPs - reduced energy losses at part loads.
ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
Improvements in existing technologies
Auxillary power consumption
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PADO (Performance Analysis, Diagnosis and Optimisation) can provide online guidance to operators to run the plant with minimum losses and downtime
Smart wall blowing system - Optimises the steam blowing cycle for soot blowers, thus improving the heat absorption in boiler surfaces and reducing the consumption of auxiliary steam.
ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
Improvements in existing technologies
Control and Instrumentation
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Washing of coal, or beneficiation, to maintain ash content to 30-35%
The benefits are: Coal quality becomes consistent wrt ash %age Economical design of Boiler, less space, fewer pulverisers,
reduced size of Auxiliaries – Lower capital cost Low operational costs Better efficiency Lower particulate emissions
ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
Improvements in existing technologies
Coal Washeries
Establishment of coal washeries needs to given a high priority.
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The station heat rate is 3% lower than with the conventional sub-critical cycle.
Power plant cycles operating above the critical pressure 221.2 bar. Supercritical cycle’s advantage - ‘burn less fuel for the same output’
and low emissions. Steam parameters like 250 bar pressure, 568 C main steam
temperature and 600 C hot reheat temperature are commonly used World-wide R & D efforts are focused on development of power
plants with ultra-supercritical steam parameters of 350 bar, 700 C main steam and reheat steam temperatures and net efficiency of 50% by the year 2015.
ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
Introduction of supercritical power plants
BHEL is associated with 660 MW Barh Super critical Project
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GAS CLEAN-UP
GAS
TURBINE H R S G
STEAM
TURBINE
GT POWER STACK ST POWER
2 BLOCKS IN COAL GASIFICATION PLANT
CLEAN FUEL GAS
3 BLOCKS IN COMBINED CYCLE POWER PLANT
STEAMGASEXHAUST
WHAT IS IGCC
NGOIL
COAL
GASIFICATION
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IGCC Advantage
Conventional Coal plant* IGCC Plant
NOx 350 ppm <25 ppm
SOx 600 ppm 245 ppm
SPM 50 mg/Nm3 2 mg/Nm3
CO2 Emission High 10% Less
Fuel consumption High 7% less
Water consumption High 40% Less
* Typical 500MW thermal plant
Low Emission, High Efficiency
Power Generation Technology
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Reduce adverse impact of fossil fuel combustion on environment
Acid rain Suspended Particulate Matter in atmosphere Green House Effect
WHY IGCC ?
Uses Low Grade fuels
Environment Friendly Power Generation
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BHEL has worked for more than 2 decades on development of IGCC
1st ever plant of 6.2 MW set up in 1988 at Trichy
Feasibility of scale up of the 6.2 MW to ~100 MW is established by BHEL
High powered R&D committee set up under chairmanship of scientific advisor has recommended for scaling up to 100 MW site rating plant
BHEL has signed an MOU with APGENCO on 10th May08 for IGCC Plant at Vijaywada
BHEL has contracted more than 60 FBC and 17 CFBC boilers
• Largest in operation : 125 MW : Under construction : 250MW
Next Step - Basic Engineering for 400 MW IGCC completed
BHEL’s Gasification & IGCC Development Program
1st Largest size 125MW IGCC Plant order expected from APGENCO in 2-3 months.
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ENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTORENERGY EFFICIENCY IMPROVEMENT IN THE POWER SECTOR
Introduction of advanced technologies
Transmission and distribution of Power
AC Transmission – 400 kV, 765 kV DC Transmission – 500, 800 1200 kV AC Transmission – Transformer, Disc Insulators,
Switchgears, CT, CVT HVDC