低温地热梯级分流有机朗肯循环系统热力性能优化

发布时间：2018-04-29 16:00

本文选题：梯级分流 + 有机朗肯循环　；参考：《热能动力工程》2016年10期

【摘要】：提出一种梯级分流ORC(有机朗肯循环)系统,并建立有/无分流两种工况下系统热力学模型。系统分别以各级换热器中蒸发温度及输出功为自变量和目标函数,利用遗传算法对其进行优化,并对两工况下系统性能进行比较,分析了级数n对系统性能的影响以及在梯级系统中各级循环的变化规律。结果表明,采用分流技术能够提高各换热器中最佳蒸发温度,降低预热器火用损,使系统性能增加;且随系统级数n增加,其性能逐渐升高,但增幅逐渐减小。当n=5时,梯级分流系统较ORC系统输出功及热效率分别高出189.47 k W和0.31%。在ORC系统中采用梯级分流技术具有重要意义,能够较大程度实现低品位能源的回收利用。
[Abstract]:An ORC (organic Rankine cycle) system is proposed, and the thermodynamic model of the system under two working conditions with or without shunt is established. The system takes evaporation temperature and output work as independent variables and objective functions respectively, optimizes them by genetic algorithm, and compares the system performance under two working conditions. The influence of series n on the performance of the system and the variation of the cycle in the cascade system are analyzed. The results show that the optimum evaporation temperature can be increased by using the split flow technique, the exergy loss of preheater can be reduced, and the system performance will increase with the increase of system series n, but the increase will decrease gradually. When n = 5, the output work and thermal efficiency of the cascade shunt system are 189.47 kW and 0.31 higher than that of the ORC system, respectively. It is of great significance to adopt cascade shunt technology in ORC system, which can realize the recovery and utilization of low grade energy to a large extent.
【作者单位】：辽宁工程技术大学机械工程学院;
【基金】：国家自然科学基金资助项目(51574136,51574138)
【分类号】：TK115

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