为了解决固体电蓄热装置储释热过程的温度分布均匀性问题，需要对蓄热体换热通道结构参数开展优化设计。根据对称性建立了表征空气与蓄热材料传热过程的传热单元，以传热单元平均温度最大和压力损失最小为优化目标，基于ANSYS Workbench的响应面优化模块对蓄热砖的几何参数（高度、宽度、厚度）和换热通道宽度开展优化设计。结果表明：恒定入口流速下，换热通道高度和宽度的增加，对传热单元平均温度的提高影响较小，但是换热通道宽度对压力损失的改变有显著影响；蓄热砖宽度或高度对于蓄热过程平均温度的改变影响明显，水平方向蓄热砖宽度由15 mm增加到40 mm平均温度降低约7.5 K，竖直方向蓄热砖高度由15 mm增加到30 mm整体蓄热温度线性降低（降温幅度7.5 K），竖直方向蓄热砖高度为20 mm、入口温度1 023 K时升温速度达到297.5 K/h；通过传热单元结构参数敏感性分析可知，设计换热通道选择的蓄热砖宽度和高度均不宜过大。

In order to solve the problem of temperature distribution uniformity in the heat storage and release process of solid electric heat storage devices, it is necessary to optimize the structural parameters of the heat transfer channel of the heat storage body. According to the symmetry, the heat transfer unit (HTU) characterizing the heat transfer process between air and heat storage material is established. Taking the maximum average temperature and the minimum pressure loss of the HTU as the optimization objectives, the geometric parameters such as height, width and thickness of the thermal storage brick and the width of the heat transfer channel are optimized with the help of the response surface optimization module of ANSYS Workbench software. The results show that the increase of the height and width of the heat transfer channel at a constant inlet flow rate has little effect on the increase of the average temperature of the HTU. However, the width of the heat transfer channel has a significant impact on the change of the pressure loss; the width or the height of thermal storage brick has a big impact on the change of average temperature during thermal storage. The width of thermal storage brick in the horizontal direction increases from 15 mm to 40 mm, the average temperature decreases by about 7.5 K; the height of thermal storage brick in the vertical direction increases from 15 mm to 30 mm, the overall heat storage temperature decreases linearly, with a temperature drop of 7.5 K; when the height of heat storage brick in the vertical direction is 20 mm, the heating rate reaches 297.5 K/h at the inlet temperature of 1 023 K; according to the sensitivity analysis of the structural parameters of the HTU, the width and thickness of the heat storage brick selected for the design of the heat transfer channel should not be too large.

TK11

国网浙江省电力有限公司科技项目（5211DS20007N）