以温差发电的上原循环为基础,考虑中国南海海域气候条件,采用模拟方法对上原循环的中间抽气环节展开分析,探究其对上原循环发电系统的循环热效率、冷热海水消耗量及循环㶲效率的影响,并分析其平准化度电成本（LCOE）。研究结果表明,存在最佳额外中间抽气率使循环热效率及㶲效率同时达到最佳,且对不同中间抽气压力,其所达到最佳值的额外中间抽气率不同。设备投资成本随额外中间抽气率的增加而增加,且成本主要集中在换热器部分。在搭建海洋温差发电工厂时,应考虑具体工况选择合适的中间抽气压力及额外中间抽气率。
Abstract
Based on the Uehara cycle of temperature difference power generation and considering the climate conditions in the South China Sea, the intermediate steam extraction segment is analyzed with simulation method. The circulating thermal efficiency, the consumption of cold and hot seawater and the circulating exergy efficiency of the power generating system with Uehara cycle are researched. Meanwhile, the Levelized cost of electricity is analyzed. The results show that there is an optimum extraction gas rate for the thermal efficiency and exergy efficiency to reach an optimal level at the same time. And for different intermediate extraction pressure, the extra intermediate extraction rate to reach the best value is different. The cost increases with the extraction rate and is concentrated in the heat exchanger. When building an ocean thermoelectric power plant, the appropriate intermediate extraction pressure and extraction rate should be selected according to the specific working conditions.
关键词
海洋温差能发电 /
低品位热能 /
经济分析 /
上原循环 /
Aspen Plus
Key words
ocean thermal energy conversion /
low-temperature heat /
economic analysis /
Uehara cycle /
Aspen Plus
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基金
国家重点研发计划（2019YFB1504301)
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