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为综合评价亚临界有机朗肯循环系统的环保和热经济性能,在分析系统循环性能的基础上,采用火用参数对工质的环境影响进行量化,提出有机朗肯循环系统环境影响评价模型和系统综合评价指标,对比分析了以可持续性系数为指标评价ORC系统整体性能的合理性,用实例研究了系统参数对循环性能的影响。结果发现,ORC系统可节省标准煤6.42×106 kg/a,减少CO2排放2.83×107 kg/a;系统可持续性系数随着膨胀机进口温度的升高存在最大值;并指出工质R124和R600a是综合考虑环保和循环性能等因素下较好的选择。
In order to comprehensively evaluate the environmental and thermal economic performance of subcritical organic Rankine cycle system, based on the analysis of the cycle performance of the system, the exergy parameter is used to quantify the environmental impact of the working fluid and the environmental impact assessment model of organic Rankine cycle system System comprehensive evaluation index, comparatively analyzed the rationality of evaluating the overall performance of ORC system by using the sustainability coefficient as an index, and studied the influence of system parameters on the cycle performance by using examples. The results showed that the ORC system can save 6.42 × 106 kg / a of standard coal and reduce the CO2 emission by 2.83 × 107 kg / a. The system sustainability coefficient has the maximum value as the inlet temperature of the expander increases. It is also pointed out that the R124 and R600a is a better choice considering factors such as environmental protection and cycling performance.