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Thermal calculations and NOx emission analysis of a micro gas turbine system without a recuperator

A thermal calculation based on a table of thermal properties of gas was
 carried out for a micro gas turbine system without a recuperator. The
 performance parameters of the micro gas turbine system were obtained. The
 results of the thermal calculations were verified using Aspen Plus, and it
 shows that the thermal calculations fit well with the Aspen simulation
 results. Based on this thermal calculation method, the variation of the
 performance parameters of the micro gas turbine system under different
 pressure and temperature ratios was analyzed. The results show that there is
 no optimum pressure ratio within the general design parameters of micro gas
 turbines, which leads to extreme values of thermal efficiency. The NOx
 generation in the combustion chamber of the micro gas turbine based on the
 Zeldovich mechanism was modeled and analyzed by coupling the one-dimensional
 thermal calculation model with the NOx emission model. The relationship
 between NOx generation rate, molar fuel factor, the characteristic pressure,
 and the characteristic temperature was obtained. The results of the analysis
 show that, in terms of controlling NOx emissions from a gas turbine, the use
 of an increased pressure ratio has a significant advantage over an increased
 temperature ratio to improve the thermal efficiency of the micro gas
 turbine.