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

The paper proposes a new CO2-capturing power generation system (PGS) that has high-efficient power generation efficiency (PGE) for utilizing waste heat (WH) from factories. As an example of WH, WH with temperature 200 degree C from refuse incinerator plants was adopted. In the proposed system (PS), the temperature of saturated steam produced by utilizing the WH is raised by com busting the fuel with the use of pure oxygen in a combustor, and is used as the main working fluid of a gas turbine PGS. It has been estimated that the PS has net fuel-base PGE of 60.9%, when turbine inlet temperature is assumed to be 850 degree C. The economics of the PS was also evaluated and the CO2 reduction cost has been estimated to be negligible small. That is, 0.066 US $/t-CO2, compared to 22.0 US $/t-CO2 of the conventional steam turbine PGS.

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