Abstract
Efficiency improvement of gas turbine cogeneration systems
Highlights
Cogeneration systems are increasingly used for producing both electricity and heat, with 88 % theoretical cycle efficiency for industry or district heating
These methods which are in Tab. 1, are increasing gas turbine inlet air temperature, cooling the inlet air of the compressor, air preheating, fuel preheating, increasing compressor inlet air pressure, increasing air excess rates, steam injection, and humidification of the inlet air of the compressor
The effects of these methods on the exergetic efficiency depend on the kind of the cogeneration cycle
Summary
Cogeneration systems are increasingly used for producing both electricity and heat, with 88 % theoretical cycle efficiency for industry or district heating. For a cogeneration system, which matched operation conditions best, there are some various methods for improving efficiency at design and operating stages These methods are reducing auxiliary power consumption, increasing gas turbine inlet air temperature, serving low compressor inlet air temperature, air preheating, fuel preheating, intercooling, increasing compressor inlet air pressure, hydrogen cooled generators, cooling and humidification of the inlet air of the compressor, increasing air excess rates, using advanced gas turbine cooling, steam injection, multiple pressure cycle with reheat and better HRSG design [1, 2, 7, 8]. Boyce has found that decreasing the compressor inlet air temperature increases the electrical power. Et al, have shown the effects of the compressor inlet air temperature on the relative work of the gas turbine, and cooling the inlet air method increases electricity production for a combined cycle gas-steam turbine power plant [12]. Efficiency improvement of gas turbine cogeneration systems the cycle is the same as the inlet air pressure the effect can be negligible. The thermo-economic optimization and economic assessment of these cycles can be found in the literature [17, 18]
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