Optimization and Analysis of Thermal Model of GE 9FA Gas Turbine Considering Humidity Variables
In order to investigate the influence of air humidity on gas turbine,this paper established two kinds of thermal models for GE PG9351FA heavy-duty gas turbine unit to analyze and optimize the design of thermal parameters of the gas turbine,and analyzed the influence of humidity change on the perform-ance of the unit by correcting the fitting formula for the thermal calculation after adding the model of the compressor under variable working conditions.The results show that when only considering the humidity change,its increase will reduce the unit power generation from the initial 256 959 kW to 254 674 kW,with a decrease of nearly 1%;the unit efficiency decreases from 37.10%to 36.77%;the turbine ex-haust temperature rises from 881.00 K to 882.74 K,with a slower change;the proportion of cooling air volume in the turbine is nearly 20%,in which the cooling air volume in the first stage stator blade rea-ches more than 50%of the total cooling air volume;the specific heat ratios of air,fuel and ISO model gas are 1.388 5,1.251 6 and 1.304 9,respectively,and the specific heat ratios of gas at all stages of the turbine are 1.289 9,1.308 5 and 1.322 4,respectively.The calculation errors of the two models are within the acceptable engineering error range.
gas turbinethermal modelcooling airdesign working conditionair humidity
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