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| 1 | 基于变工质模化方法的超临界CO_(2)储能透平膨胀机相似特性分析显示文摘变工质下透平膨胀机的相似模化特性研究是特殊工质透平膨胀机研发的关键技术手段和必要方法,也是提升研发效率和节约成本的有效途径。本文提出了一种基于转速、进口总温、绝热指数和气体常数的适用于透平膨胀机变工质的新型模化方法,并利用某透平膨胀机对超临界CO_(2)与空气的相似模化进行了数值验证。结果显示,在总体性能参数的模化上具有较高的精确度;在内部流场预测(马赫数、速度分布)等方面也具有良好的模化效果。该方法适用于利用空气模化高温度、高压力下的超临界CO_(2)储能做功过程。 | 李祎然 李文 常学煜 左志涛 李辉 陈海生 | 2021 | 储能科学与技术2021，10，5： | 2 |
| 2 | Design Optimization and Operating Performance of S-CO_(2) Brayton Cycle under Fluctuating Ambient Temperature and Diverse Power Demand Scenarios显示文摘The supercritical CO_(2)(S-CO_(2)) Brayton cycle is expected to replace steam cycle in the application of solar power tower system due to the attractive potential to improve efficiency and reduce costs.Since the concentrated solar power plant with thermal energy storage is usually located in drought area and used to provide a dispatchable power output,the S-CO_(2) Brayton cycle has to operate under fluctuating ambient temperature and diverse power demand scenarios.In addition,the cycle design condition will directly affect the off-design performance.In this work,the combined effects of design condition,and distributions of ambient temperature and power demand on the cycle operating performance are analyzed,and the off-design performance maps are proposed for the first time.A cycle design method with feedback mechanism of operating performance under varied ambient temperature and power demand is introduced innovatively.Results show that the low design value of compressor inlet temperature is not conductive to efficient operation under low loads and sufficient output under high ambient temperatures.The average yearly efficiency is most affected by the average power demand,while the load cover factor is significantly influenced by the average ambient temperature.With multi-objective optimization,the optimal solution of designed compressor inlet temperature is close to the minimum value of35℃ in Delingha with low ambient temperature,while reaches 44.15℃ in Daggett under the scenario of high ambient temperature,low average power demand,long duration and large value of peak load during the peak temperature period.If the cycle designed with compressor inlet temperature of 35℃ instead of 44.15℃ in Daggett under light industry power demand,the reduction of load cover factor will reach 0.027,but the average yearly efficiency can barely be improved. | YANG Jingze YANG Zhen DUAN Yuanyuan | 2024 | Journal of Thermal Science2024，33，1： | 0 |
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