Abstract
Exergy analysis on existing industrial gas turbine co-generation system was fulfilled. Compared to enthalpy analysis, the advantage of exergy analysis is to clearly grasp the irreversible change loss of the components and to prospect the system improvement. The results showed that the biggest exergy loss was found occurring in the combustor and adopting high compression ratio was effective to improve the combustor exergy loss smaller. Thus the latest gas turbine co-generation system gave high exergy efficiency above 50%. Detailed exergy analysis on hydrogen gas turbine and GRAZ cycle as hydrogen oxygen combustion cycle were also fulfilled. The result showed that merely alternating fuels from natural gas to hydrogen did not improve combustor exergy loss nor cycle exergy efficiency. Hydrogen oxygen combustion and hydrogen air combustion are almost equivalent form the point of combustion exergy loss. The advantage of GRAZ cycle as hydrogen oxygen combustion cycle was to improve combustion exergy loss by adopting higher combustion pressure and higher temperature combustor inlet working fluid.
