摘要
为了提高船用燃气轮机效率并降低排烟温度,提出一种由超临界CO2循环和有机闪蒸循环组成的新型余热回收循环:该循环中超临界CO2循环回收高温烟气,有机闪蒸循环回收低温烟气。对该系统进行了热力学分析和以循环净功率为目标函数的优化分析,结果表明:在基本工况下,接入该余热回收循环后的燃气轮机热效率和[火用]效率高达50.4%和68.93%,比未接余热回收循环的燃气轮机热效率提高了44%,[火用]效率提高了43.6%;冷凝器[火用]损最大,为842.04 kW,占余热回收循环总[火用]的6%;当CO2压气机压比越大、加热器1和加热器2的端点温差越小时,余热回收循环的净功率越大;有机闪蒸循环的蒸发温度处于最佳值时,余热回收循环净功率最大;当有机工质为对二甲苯时,该余热回收循环的净功率最高,为9 759.64 kW,最终排烟温度最低,为177.6℃。
To improve the efficiency of the shipborne gas turbine and reduce the temperature of exhaust gas,a novel waste heat recovery cycle composed of supercritical carbon dioxide regenerator Brayton cycle and organic flash cycle is proposed,in which the supercritical carbon dioxide recycles the high temperature exhaust gas,and the organic flash cycle recovers the low temperature exhaust gas.Then,thermodynamic analysis of the cycle and optimization of the target function with cyclic net power are conducted.The results show that under the basic conditions,the thermal efficiency and enthalpy efficiency of the gas turbine after the waste heat recovery cycle are up to 50.4%and 68.93%,which is 44%and 43.6%higher than that of the stand-alone gas turbine cycle,respectively.In addition,the largest value of exergy loss is 842.04 kW in the condenser,accounting for 6%of the system total exergy value.When the carbon dioxide compression pressure ratio is larger and the terminal temperature difference between the heater 1 and heater 2 is smaller,the organic flash cycle evaporation temperature is at the optimum value,and the net power of the cycle is the largest.The largest value of net power is 9759.64 kW and the final temperature of exhaust gas can be reduced to 177.6℃when using p-xylene.
作者
王喜军
王顺森
吴闯
刘雨婷
孙兴业
陈达
WANG Xijun;WANG Shunsen;WU Chuang;LIU Yuting;SUN Xingye;CHEN Da(Institute of Turbomachinery,Xi’an Jiaotong University,Xi’an 710049,China)
出处
《西安交通大学学报》
EI
CAS
CSCD
北大核心
2019年第11期71-78,共8页
Journal of Xi'an Jiaotong University
关键词
船用燃气轮机
余热回收循环
热力学分析
优化分析
shipborne gas turbine
waste heat recovery cycle
thermodynamic analysis
optimization
