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Content archived on 2024-04-19

Coal-fired multicycle power generation systems for minimum noxious gas emission, CO2-control and CO2-disposal


The emission of carbon dioxide and other pollutant gases from fossil fuel-fired power stations contribute to the man-made greenhouse effect. The project concentrates on studies and investigations of technologies to reduce or eliminate such emissions from coal-fired power generation systems. This project aims at providing the basis for planning and design of coal-fired combined cycle power generation systems for CO2 emission control and minimum noxious gas emission, to estimate costs and to show ways of carbon dioxide capture and dumping or utilization.

The efficiency obtained from the IGCC with CO2 separation was about 40%, based on current IGCC plants with modern gas turbine generators. This is within the efficiency range of conventional coal-fired power plants, but is about 6% lower than an IGCC plant without CO2 removal. Capital investment needed to incorporate the CO2 removal components added about 10% (50 million ECU) onto investment costs for a commercial 300 MWe IGCC. Electricity generation costs were increased by 18% compared with those of an IGCC without CO2 removal, and were 30% higher compared with a conventional modern steam power plant. These costs rise to 50% if the CO2 is extracted as a liquid. Overall, the costs of CO2 emission avoidance were calculated to be 20-40 ECU/t CO2.

The only market identified for CO2 utilisation was the transport sector, where CO2 could contribute to the production of synthetic methanol/gasoline to substitute for mineral oil derivatives. Allocating the CO2 removal costs to the electricity generating costs results in gasoline costs near to present market prices including tax.
A survey of fossil fuel-fired multicycle power generation systems which are qualified for CO2 control will be elaborated. Two variants of process schemes will be investigated in more detail: - coal gasification with oxygen, CO/steam shift conversion, H2 /CO2 separation, combustion of hydrogen with air - coal gasification and combustion with oxygen, CO2 turbine and CO2 recycling.

Both variants are applicable to the combined cycle or to even more advanced multicycle systems. The systems are complex and optimization involves gasification, gas clean-up, gas separation, gas/steam turbine plants, heat integration and CO2 removal. The investigation of appropriate gas clean up and gas separation systems will include the compilation of all gas cleaning options related to IGCC concepts, the evaluation of sorption type processes in viewpoint of simultaneous H2S and CO2 removal must be considered with respect to the disposal, i.e. whether CO2 is removed in the gaseous or liquid state or even as dry ice. The investigations involve mathematical modelling, thermodynamical, chemical and thermal engineering analyses, an appraisal of materials, turbo machinery and performance. The programme includes also the elaboration of flow schemes for pre-basic design of the aforementioned selected power plant processes, cost analyses of such power plants and of the avoidance of CO2 emissions, respectively.

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Universität Gesamthochschule Essen
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Universitätsstraße 2-17
45141 Essen

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