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在烟气热源温度不同的条件下,研究亚临界有机朗肯循环发电系统中热效率与有机工质的关系,并对优选出的有机工质应用于回热系统进行研究。结果表明,对亚临界有机朗肯循环系统,在一定的热源参数下,当有机工质在膨胀机入口温度恒定时,以膨胀机入口工质为干饱和蒸汽状态时系统效率最大;同时对比系统效率及有机工质的可燃性和毒性等因素。对于低温烟气热源的有机朗肯循环发电系统,其有机工质R245fa优于其它工质,系统效率可达10.2%;热源为高温烟气时,有机工质R601a相对较优,但因其高度可燃性,应研究适于高温热源的新型工质;回热有机朗肯循环发电系统效率相对简单系统较高,主要原因是冷凝器侧换热能量损失减少。
Under the condition of different flue gas heat source temperature, the relationship between thermal efficiency and organic working medium in subcritical organic Rankine cycle power generation system is studied, and the optimized organic working medium is applied to the regenerative heating system. The results show that for a subcritical organic Rankine cycle system, the system efficiency is maximized under the condition of constant heat source parameters when the working medium is in the state of dry saturated steam when the working medium is at constant inlet temperature of the expander; at the same time, Efficiency and flammability of organic working medium and toxicity and other factors. For the organic Rankine cycle power generation system with low-temperature flue gas heat source, the R255fa is better than other working fluids and the system efficiency is up to 10.2%. When the heat source is high-temperature flue gas, the R601a is relatively superior, Flammability, should be suitable for high temperature heat source of new refrigerant; Regenerative organic Rankine cycle power generation system is relatively simple and efficient system is higher, mainly due to the reduction of heat loss on the condenser side of heat transfer.