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

qian.zhu@iea-coal.org

Next webinar

Outlook for environmental equipment under new

mercury regulations

Dr Lesley Sloss, 17 December