为提高有机朗肯循环（ORC）系统的效率及减少对环境的污染,该文对太阳能驱动的传统CO2跨临界朗肯循环进行改进,采用双级压缩中间再热的形式,减少压缩机耗功,提高系统效率。对系统建立热力学、经济和环境模型。研究900 kW级CO2朗肯循环太阳能发电系统的透平入口温度、导热油流量和分流比对系统热力-经济-环境性能的影响。并采用非支配排序遗传算法（NSGA-Ⅱ）进行多目标优化。结果表明,透平入口温度对热效率的影响最大,而分流比和导热油流量分别对平准化度电成本和CO2减排量的影响较大。通过多目标优化得到Pareto最优解,即：在透平入口温度为206 ℃、导热油流量为14.75 kg/s、分流比为0.1条件下,系统热效率为21.76%,平准化度电成本为0.12美元/kWh,CO2减排量为9458 t。研究结果可为中国中低温光热发电技术的完善和实际应用提供一定的理论指导。
Abstract
In order to improve the efficiency of Organic Rankine Cycle （ORC） system and reduce the pollution to the environment, this paper improves the conventional CO2 transcritical Rankine cycle driven by solar energy. A two-stage compression with intermediate reheating is used to reduce the compressor power consumption and improve the system efficiency. Thermodynamic, economic and environmental models were established. The effects of the turbine inlet temperature, flow rate of heat transfer oil and shunt ratio on the thermodynamic-economic-environmental performance of a 900 kW class CO2 Rankine cycle solar power system were investigated. Multi-objective optimization was carried out using the non-dominated sequential genetic algorithm （NSGA-Ⅱ）. The results show that the turbine inlet temperature has the greatest influence on thermal efficiency, and the shunt ratio and heat transfer oil flow rate have a greater influence on LCOE and CO2 emission reduction, respectively. The Pareto optimal solutions are obtained by multi-objective optimization. The optimized results indicate that the thermal efficiency of the system is 21.76%, the levelized cost of electricity（LCOE） is 0.12 $/kWh, and the reduction of CO2 emission is 9, 458 tons at turbine inlet temperature of 206 ℃, flow rate of heat transfer oil of 14.75 kg/s, and shunt ratio of 0.1. The study results can provide some theoretical guidance for the improvement and practical application of medium-and low-temperature photothermal power generation technology in China.
关键词
太阳能 /
朗肯循环 /
多目标优化 /
双级压缩中间再热 /
热力学-经济-环境分析
Key words
solar energy /
Rankine cycle /
multiobjective optimization /
two-stage compression with intermediate reheating /
thermodynamic-economic-environmental analysis
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基金
天津市自然科学基金（24JCYBJC00730）; 天津市科技特派员项目（22YDTPJC00020）; 天津市建筑绿色功能材料重点实验室开放基金资助（2024-01-18）
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