液化天然气冷能回收混合动力循环参数分析

提出了以氨水为工质的朗肯循环、燃气动力循环和液化天然气循环组成的混合动力循环系统，用于液化天然气冷能回收。建立了混合动力循环中换热和动力设备的能量平衡方程和可用能平衡方程，并以朗肯循环冷凝温度、朗肯循环透平进出口压力、液化天然气循环透平进出口压力为关键参数，分析了上述关键参数对混合动力循环热效率和可用能效率的影响。分析结果表明，混合动力循环热效率和可用能效率随朗肯循环冷凝温度升高、朗肯循环透平进口压力和液化天然气循环透平进口压力增大而提高，随朗肯循环透平出口压力和液化天然气循环透平出口压力增大而降低。

Parameter analysis of combined power cycle with liquefied natural gas cold energy recovery

A combined power cycle with LNG cold energy recovery consisting of Rankine cycle using ammonia-water as working fluid,power cycle of combustion gas,and LNG cycle,was presented.The energy balance equations and exergy balance equations of heat exchanger and power equipment in the combined power cycle were established.Taking condensation temperature of Rankine cycle,inlet and outlet pressure of turbine of Rankine cycle,inlet and outlet pressures of turbine of LNG cycle as key parameters,the influences of these parameters on the thermal efficiency and exergy efficiency of the combined power cycle were analyzed.Analytical results showed that the thermal efficiency and exergy efficiency increased with increasing condensation temperature of Rankine cycle,inlet pressure of turbines of Rankine cycle and LNG cycle,and decreased with increasing outlet pressure of turbines of Rankine cycle and LNG cycle.