Investigation Of Humid Air Turbine Cycle Test Facility Configuration And Cogeneration Performance

Humid air turbine cycle(HAT cycle)is an efficient,advanced clean power cycle,and is one of the hotspots of power cycle research at home and abroad.HAT cycle has the potential to be applied in the cogeneration system due to its high electrical efficiency and flexible adjustment of the heat to power ratio.Since the introduction of the HAT cycle,domestic and foreign scholars have conducted extensive research on its thermal system,key technologies and thermal economy.Based on theoretical research,experimental research on HAT cycle has also been carried out,but there are few experimental studies on HAT cycle.In particular,the cycle characteristics test above 10 MW has not been reported.In view of the current situation,this paper takes two 10 MW class gas turbines with different pressure ratio as the research objection,and constructs its simple cycle cogeneration system,regenerative cycle cogeneration system and HAT cycle cogeneration system,respectively,and gives the gas turbine flow matching results,the thermal performance of the system during wide scale heat to power ratio adjustment,and the technical requirements for components such as the combustion chamber,and the thermal performance of each cycle under different ambient temperature and partial loads were analyzed.The specific research contents of this paper are as follows:1)Established design and off-design models of HAT cycle thermal system components,including compressors,turbines,heat exchangers(gas-to-gas heat exchangers,gas-water heat exchangers,gas-steam heat exchangers)),humidifier,at the same time gives the main indicators to evaluate the performance of the system.2)The mass transfer unit model of the humidifier based on the humidifier saturation line and the operation line was established.The calculation efficiency was improved while maintaining computational accuracy.The comparison error between the model calculation result and the experimental result is less than 5%.3)Built two types of 10 MW class gas turbine models with the pressure ratio of 15.5 and 7.15,and studied the thermal performance of the simple cycle combined heat and power production,the regenerative cycle combined heat and power production,the HAT cycle combined heat and power production based on the two gas turbines under different thermoelectric adjustment methods.The gas turbine flow matching results,the thermal performance of the system and the technical requirements for components such as the combustion chamber were given.For gas turbine A with the pressure ratio of 7.15,when it is adjusted within the full range of HAT cycle combine heat and power,the air moisture content of the system entering the combustion chamber is between 6 g/kg and 176 g/kg,and the inlet air temperature of the combustion chamber is between 70? and 505?.The air pressure is near 0.7 MPa,the compressor venting amount is 0-5.3 kg/s;and for gas turbine B with the pressure ratio of 15.5,the compressor venting amount is 0-6.3 kg/s,the inlet air temperature of the combustion chamber is between 134? and 453?,the air moisture content of the system entering the combustion chamber is between 6 g/kg and 202 g/kg,and the inlet air pressure is around 1.5 MPa.4)Studied the thermal performance and variation characteristics of exhaust temperature of the simple cycle combined heat and power production,the regenerative cycle combined heat and power production,the HAT cycle combined heat and power production under different thermoelectric adjustment methods of the two gas turbines at different working conditions.When the ambient temperature rises from 0? to 35?,the electrical load of the gas turbine A decreases by about 20%,the electrical efficiency decreases by 6%-12%(relative value),and the efficiency of combined heat and power supply increases by 1%-5%(relative value);and the electrical load of the gas turbine B drops by about 20%,the electrical efficiency changes by 2%-4%(relative value),the combined heat and power supply efficiency increases by 3%-6%(relative value),and the exhaust temperature of two gas turbine both decrease with increasing ambient temperature.When the load is reduced to 50%,the electrical efficiency of the gas turbine A is reduced by 15%-27%(relative value),the cogeneration efficiency is reduced by 15%-44%(relative value),and the electrical efficiency of the gas turbine B is reduced by 22%-36%.(relative value),cogeneration efficiency decreased by 16%-46%(relative value).Except for pure power supply conditions,the exhaust temperature decreased with the load decrease,and the exhaust temperature of other working conditions increased with the load decrease.The above results can provide a reference for the design,construction and operation of the 10 MW HAT cycle test rig.