§ Mr GummerTo ask the President of the Board of Trade what reduction in CO2, emissions is made when so-called clean coal technology is used instead of other existing forms of generation. [2641]
§ Mr. BattleThe tables set out the reductions in CO2, emissions from various clean coal power generation technologies currently available or under development compared with a reference conventional pulverised coal plant. The information was provided by IEA Coal Research—The Clean Coal Centre and will appear in a report to be published later this year by the Centre. The table indicates some 20–30 per cent. reduction may be possible if clean coal plant replaces existing conventional coal plant. however all coal fired generation releases significantly more CO2, per unit of electricity than combined cycle gas turbine stations and there would be an increase in emissions if clean coal plant replaced such plant. There would also be an increase in emissions of CO2, if clean coal plant replaced oil fired plant, nuclear or renewables sources of energy.
Reductions in carbon dioxide emissions from various clean coal technologies compared to a conventional reference plant Technology Net plant efficiency, per cent. LHV1 CO2, reduction per cent. Conventional systems Pulverised coal Reference plant 36 0 Subcritical steam 39 8 Supercritical steam 42–45 14–20 Ultra-supercritical steam 47–52 23–31 AFBC2 Subcritical steam 39 6 Combined cycles IGCC3 Demonstrated systems 38–43 8–18 Advanced systems 45–47 22–25 PFBC4 Subcritical steam 44 19 Supercritical steam 46 22 Hybrid5 Subcritical steam 47–49 23–27 Supercritical steam 52 31 Notes:
1 LHV—Low Heating Value.
2 AFBC—Atmospheric Fluidised Bed Combustion.
3 IGCC—Integrated Gasification Combined Cycle.
4 PFBC—Pressurised Fluidised Bed Combustion.
5 Assumes Flue Gas Desulphurisation (FGD) fitted to conventional systems, PFBC and Hybrid Cycles Gasifier + PFBC technology.
Source:
IEA Coal Research unpublished report ("Greenhouse gas emission factors for coal"—expected to be published in 1997).