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为研究超临界工况下增加回热器对低温余热发电系统性能的影响,建立了带回热器的超临界有机朗肯循环计算模型;指出了在超临界工况下由一般方法计算有机朗肯循环的热力参数存在一定偏差,运用EES(Engineering Equation Solver)软件对有、无回热器两种情况下系统的热力参数进行了计算。研究表明:在超临界工况下,以R152a为工质,系统增加回热器后最大热效率提高了0.65%,对应的蒸发压力降低了494 kPa;系统火用效率有所提高,但增加幅度有限;多目标优化发现,增加回热器后系统最佳工况点为蒸发压力4 654 kPa,比无回热器时降低了318 kPa。
In order to study the influence of adding recuperator on the performance of low temperature waste heat power generation system under supercritical conditions, a computational model of supercritical organic Rankine cycle with regenerator was established. It was pointed out that in the supercritical conditions, The thermodynamic parameters of Ken cycle have some deviations, and the thermodynamic parameters of the system with and without regenerator are calculated by EES (Engineering Equation Solver) software. The results show that under supercritical conditions, R152a is the working medium, the maximum thermal efficiency increases by 0.65% and the corresponding evaporation pressure decreases by 494 kPa with the increase of regenerator temperature. The exergy efficiency of the system is increased, but the increase range is limited The multi-objective optimization found that the optimal operating conditions of the regenerator are 4 654 kPa evaporation pressure and 318 kPa lower than those without regenerator.