为研究卧式固体颗粒填充床系统的储热性能,搭建以空气作为传热介质的实验装置,对储/放热过程的热力学特性和压降变化进行了实验与数值模拟研究。结果表明,填充床储放热效率达到95.5%,热空气入流速度从0.40 m/s增至1.96 m/s时,储罐有效利用率提高15个百分点,储热时间缩短70%。运行过程中,填充床顶部出现沉降现象,导致后段填充床提前加热,整体储热量降低。通过在床层顶部设置合理插入深度的挡板,可有效缓解空气旁路问题。当储热滞后系数k=1时,空气层与填充床温度场推移速度一致,此时挡板插入深度最优。
Abstract
To investigate the thermal storage performance of horizontal packed-bed systems filled with solid particles, an experimental setup was established using air as the heat transfer medium. Experimental and numerical studies were conducted to analyze the thermodynamic characteristics and pressure drop variations during the charging and discharging processes. Results showed that the round-trip efficiency of the packed bed reached 95.5%. When the inlet airflow velocity increased from 0.40 m/s to 1.96 m/s, the effective utilization rate improved by 15 percentage points, and the storage duration decreased by 70%. During operation, a top-layer settling phenomenon occurred in the packed bed, leading to premature heating of the downstream section and a reduction in overall thermal storage capacity. By installing baffles with an optimal insertion depth at the top of the bed, the impact of air bypass could be effectively mitigated. When the thermal storage lag coefficient k=1, the propagation speed of the temperature field in the air layer matched that in the packed bed, achieving the optimal baffle insertion depth.
关键词
填充床 /
储热 /
数值模拟 /
储热实验 /
空气旁路
Key words
packed beds /
heat storage /
mumerical simulation /
thermal storage experiment /
air bypass
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基金
国家重点研发计划（2022YFB2405205）; 湖州市重点研发计划（2024ZD2037）
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