摘要
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。
To study the influence of a recuperator additionally installed in a low temperature waste heat power generation system on the performance of the system under the supercritical operating condition,established was a supercritical organic Rankine cycle calculation model.It has been noted that the thermal parameters of the organic Rankine cycle calculated under the supercritical operating condition by using the common methods have certain deviations.By employing the EES(engineering equation solver) software,the thermal parameters of the system with and without a recupertor were calculated.The research results show that with R152a serving as the working medium and under the supercritical operating condition,the maximal thermal efficiency of the system after a recupertor has been additionally mounted can increase by 0.65% and the corresponding evaporation pressure can go down by 494 kPa.The exergy efficiency of the system can somehow increase,however,such an increment has its limits.It has been found through a multi-target optimization that after an additional installation of a recupertor,the evaporation pressure of the system under the optimum operating condition is 4654 kPa and down by 318 kPa when compared with the case without a recupertor.
出处
《热能动力工程》
CAS
CSCD
北大核心
2013年第1期42-47,108-109,共6页
Journal of Engineering for Thermal Energy and Power
基金
国家重点基础研究发展计划("973"计划)基金资助项目(2010CB227301)
关键词
低温余热发电
超临界
有机朗肯循环
回热器
多目标优化
low temperature waste heat power generation,supercritical,organic Rankine cycle,recuperator,multi-target optimization
