Abstract
An efficiency of an oxy-fuel Integrated Coal Gasification system having a molten carbonate fuel cell, a gas turbine, and a steam turbine is calculated. A shift converter is employed to the heating up procedure of the fuel gas. The cathode gas is composed of CO_2 and O_2 with a composition of 66.7/33.3 (Noble cathode gas). The net efficiency of 2.2MPa system reached to 60%HHV with no CO_2 capture, whereas the efficiency of the 0.15MPa low pressure system is calculated to be 50%HHV. For the purpose to estimate the IG/MCFC system efficiency with CO_2 capture, a liquid CO_2 capture with a pressure of 10MPa is supposed. Using 2.2MPa high pressure system, the efficiency includes the a consumption of liquified CO_2 capture is evaluated to 58%HHV in the net value. Another simple CO_2 closed system with no gas turbine is proposed; the efficiency of 2.2MPa and 0.15MPa system includes the consumption of CO_2 liquefication is calculated to be 56% and 48%HHV net, respectively.
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