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High-efficiency power generation – alternative system concepts Dr Qian Zhu The IEA CCC webinar 19 Nov 2014
High-efficiency power generation –
alternative system concepts
Dr Qian Zhu
The IEA CCC webinar 19 Nov 2014
Coal-fired power generation today
pulverised coal
fired power plant
Rankine cycle
Average coal-fired power plant efficiencies in selected countries
Fuel cells
High temperature MCFC and SOFC offer the best opportunity
for thermal integration with coal gasification systems
Fuel cell power plants
The 58.8 MWe Gyeongg fuel cell
power plant
Cell to stack to module buildup
Integrated gasification fuel cell (IGFC) systems
Comparison of IGFC and IGCC with CCS
IGCC Atmospheric
pressure IGFC
Pressurised
IGFC
efficiency (%) 32.5 49.4 56.2
CO2 emission
(kg/MWh)
93.44 1.36 1.36
water
consumption
(litre/MWh)
2246 877 782
capital cost
(2007$/kW)
2400 2000 1800
LCOE
(cents/kWh)
10.2 8.8 7.9
Magnetohydrodynamic (MHD) power generation systems
MHD power generation principle
A typical coal-fired MHD-steam combined cycle
High Performance Power Generating system (HIPPS)
High-temperature advanced furnace (HITAF)
All-coal-fired HIPPS process (with pyrolyser)
Chemical looping combustion (CLC)
Drawing of Alstom’s a 550-MWe CLC power plant →
Chemical looping combustion/gasification
Coal-fuelled CLC power plant with CCS
Alternatives to steam Rankine cycles
Kalina cycle
organic Rankine cycle (ORC)
Goswami cycle
Supercritical carbon dioxide (sCO2) power cycle
Supercritical carbon dioxide (sCO2) power cycle
Solar-coal hybrid power system
Integration of solar energy with coal power system
Steam produced by solar energy can be used to:
• heat the boiler feed-water in a closed cycle (The Colorado Integrated Solar Project);
• replace the steam extracted from steam turbine to heat the feed-water (Sundt Solar
Boost Project);
• power the steam turbine, after being further heated, to generate electricity (Kogan
Creek Solar Boost Project), or
• use the solar thermal energy to preheat combustion air.
Concluding remarks
Coal will continue to play an important role in the
world power generation.
Technologies for power generation systems
alternative to steam Rankine cycle are under
development and some have achieved significant
progress in recent years.
If these technologies can be developed into practical
systems, they could ultimately have a significant
impact on coal-based power generation.
Thank you for listening!
Questions?
Qian Zhu
Next webinar
Outlook for environmental equipment under new
mercury regulations
Dr Lesley Sloss, 17 December
