为提高有机朗肯循环热力性能,降低成本和环境影响,以双压串联有机朗肯循环为研究对象,在150 ℃烟气热源条件下,选用R245fa/R141b和R245fa/正戊烷正混合工质,研究高/低压蒸发温度对循环热力、经济、环境性能的影响。结果表明：高压蒸发温度是双压有机朗肯循环系统的净输出功、![]()
效率、平均化电能成本的关键变量;低压蒸发温度是系统的热效率、当量二氧化碳排放量的关键变量。由于上述单性能指标对系统的性能分析并不全面,因此提出多目标蜣螂优化算法（MODBO）进行系统三目标优化,优化结果表明：采用R245fa/R141b为工质的综合性能优于R245fa/正戊烷,最佳运行参数为：R245fa质量分数为0.1,高压蒸发温度为395.96 K,低压蒸发温度为371.63 K,窄点温差为5.00 K;此时最优解对应的系统热效率、平均化电能成本及当量二氧化碳排放量分别为14.97%、0.3362美元/kWh、10.778 kg CO2 eq/kWh。
Abstract
In order to improve the thermal performance of the dual-pressure organic Rankine cycle and to reduce the cost and environmental impact, the dual-pressure tandem organic Rankine cycle is taken as the research object. Under the condition of a 150 ℃ flue gas heat source, R245fa/R141b and R245fa/Pentane mixed working fluids are selected to study the influence of high and low- pressure evaporation temperatures on the cycle's thermal, economic, and environmental performances, and the results show that the high-pressure evaporation temperature is a key variable for the net output work, exergy efficiency, and averaged electrical energy cost of the dual-pressure organic Rankine cycle system. The low-pressure evaporation temperature is a key variable for the system’s thermal efficiency, and equivalent carbon dioxide emissions. Since the above single performance indices are not comprehensive for the performance analysis of the system, this paper innovatively proposes the multi-objective dung beetle optimization algorithm （MODBO） for the three-objective optimization of the system, and the optimization results show that the comprehensive performance of using R245fa/R141b as the working fluid is better than that of R245fa/Pentane, and the optimal operating parameters are： the mass fraction of R245fa is 0.1, the high-pressure evaporation The optimal operating parameters are： R245fa mass fraction is 0.1, high-pressure evaporation temperature is 395.96 K, low-pressure evaporation temperature is 371.63 K, and the narrow-point temperature difference is 5.00 K. At this point, the optimal solutions corresponds to the system’s thermal efficiency, averaged cost of electrical energy, and equivalent CO2 emissions are 14.97 %, 0.3362 $/kWh, and 10.778 kg CO2 eq/kWh, respectively.
关键词
有机朗肯循环 /
多目标优化 /
蜣螂优化算法 /
双压系统 /
余热回收利用
Key words
organic Rankine cycle /
multi-objective optimization /
dung beetle optimization algorithm /
dual-pressure system /
waste heat recovery
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基金
辽宁省教育厅科学研究经费项目（面上项目）（LJKZ1106); 辽宁省科学技术计划（2022-NLTS-16-02）
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