为了研究不同运行工况条件下的换热特性,利用分段集总参数法搭建流化床固体颗粒/sCO2换热器的仿真数学模型,并对换热系统在不同输入变量扰动下的动态特性及对关键参数的敏感性进行分析和研究。结果表明：换热系统输入侧入口温度的扰动对换热器输出温度的影响幅度较大,而输入侧质量流量的扰动对输出温度的影响较小;小管径和低管数有利于获得较高的sCO2侧换热系数;同时,在符合最小流化条件下,小粒径和较低的流化气体速度有利于颗粒侧传热系数的提高。
Abstract
In order to study the heat transfer characteristics under different operating conditions, a model of fluidized-bed solid particle/sCO2 heat exchanger is established by using the multi-section lumped parameter method in this paper, and the dynamic characteristics of the heat transfer system under the disturbances of different input variables are studied. Besides, the sensitivity of system performance to the key parameters is also analyzed. The results show that the disturbance of inlet temperature of the heat exchange system has a large influence on the outlet temperature of the heat exchanger, while the mass flow rate on the input side has a small influence; Small tube dimension and low tube number are easy to obtain a higher heat transfer coefficient for sCO2 side. In addition, the small particle size and the lower fluidizing-gas velocity are conducive to the improvement of the particle-side heat transfer coefficient under the minimum fluidization condition.
关键词
太阳能热发电 /
固体颗粒 /
超临界二氧化碳 /
换热器 /
集总参数法
Key words
solar thermal power /
solid particle /
sCO2 /
heat exchanger /
lumped parameter method
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基金
超临界CO2太阳能热发电关键基础问题研究（2018YFB1501005）; 北京市面上太阳能热发电流化床固体颗粒/sCO2换热器气-固传热特性与强化机理研究（3222033）; 中国科学院青年创新促进会项目
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