Abstract

This paper shows how to obtain the complete recovery of exhaust heat in the context of a gas turbine power plant. The power plant uses partial combustion of the fuel and yields power and a synthesis gas for further use in a chemical plant or conventional steam power plant. The key is a heat exchanger in conjunction with a Ni/NiO chemical loop that alters the composition of the air stream so that there is nearly a perfect match of the hot and cold streams down to ambient temperature. The chem-loop removes the oxygen for fuel combustion from the air as it raises the temperature of both the water/air and the synthesis gas streams (only the latter is used for power production). Assuming no heat losses from unit operations, no parasitic losses, and a pinch of only 2°C (simultaneous boiling and condensing) the First Law efficiency of the power plant can be over 98% (Second Law is about 45%). There are no acidic stack gases to contend with at this point as the partially combusted fuel is then exported for other uses, its value diminished only by the amount of power produced.

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