Characteristics and economic evaluation of a CO2-capturing solar thermal hybrid power generation system with heat storage

SUMMARYIt is becoming more important to realize CO 2 -capturing power generation systems (PGSs) for drastically decreasing an amount of CO 2 emission into the atmosphere. However, net power generation efficiency (NPGE) of a CO 2 -capturing system has been considered to be greatly deteriorated, since capturing CO 2 requires extra energy. This paper proposes a new CO 2 -capturing PGS that has a high-efficient NPGE by utilizing waste heat from factories. As an example of a waste heat, exhaust gas with temperature 2001C from refuse incinerator plants is adopted. In the proposed system, the temperature of saturated steam produced by utilizing the waste heat is raised by combusting fuel with the use of pure oxygen in a combustor, and is used as the main working fluid of a gas turbine PGS. It is estimated that the proposed system has a fuel-to-electricity NPGE of 59.3%, when turbine inlet temperature (TIT) is assumed to be 10001C. The economics of the proposed system is also evaluated and the CO 2 reduction cost is estimated to be small; 4.16 U.S. $ t À1 CO 2 compared with 32.1 U.S. $ t À1 CO 2 for a conventional steam turbine PGS. It is shown that CO 2 -capturing is not cost consuming but becomes to be profitable owing to improved power generation characteristics, when its TIT is increased from 1000 to 12001C.

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Comprehensive evaluation of a CO2-capturing high-efficiency power generation system for utilizing waste heat from factories

Pak

Lee

Ahn

2009

Int. J. Energy Res.

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Characteristic evaluation of a CO2-capturing repowering system based on oxy-fuel combustion and exergetic flow analyses for improving efficiency

Pak

Lee

Ahn

2010

Int. J. Energy Res.

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SUMMARYA CO 2 -capturing H 2 O turbine power generation system based on oxy-fuel combustion method is proposed to decrease CO 2 emission from an existing thermal power generation system (TPGS) by utilizing steam produced in the TPGS. A high efficient combined cycle power generation system (CCPS) with reheat cycle is adopted as an example of existing TPGSs into which the proposed system is retrofitted. First, power generation characteristics of the proposed CO 2 -capturing system, which requires no modification of the CCPS itself, are estimated. It is shown through simulation study that the proposed system can reduce 26.8% of CO 2 emission with an efficiency decrease by 1.20% and an increase power output by 23.2%, compared with the original CCPS. Second, in order to improve power generation characteristics and CO 2 reduction effect of the proposed system, modifications of the proposed system are investigated based on exergetic flow analyses, and revised systems are proposed based on the obtained results. Finally, it is shown that a revised proposed system, which has the same turbine inlet temperature as the CCPS, can increase power output by 33.6%, and reduce 32.5% of CO 2 emission with exergetic efficiency decrease by 1.58%, compared with the original CCPS.

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Characteristics and economic evaluation of a power plant applying oxy-fuel combustion to increase power output and decrease CO2 emission

Pak

Lee

Ahn

2010

Energy

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Characteristics and economic evaluation of a CO2-capturing solar thermal hybrid power generation system with heat storage

Cited by 5 publications

References 4 publications

Comprehensive evaluation of a CO2-capturing high-efficiency power generation system for utilizing waste heat from factories

Comprehensive evaluation of a CO2-capturing high-efficiency power generation system for utilizing waste heat from factories

Characteristic evaluation of a CO2-capturing repowering system based on oxy-fuel combustion and exergetic flow analyses for improving efficiency

Characteristics and economic evaluation of a power plant applying oxy-fuel combustion to increase power output and decrease CO2 emission

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