移动式间隔蓄热器的蓄放热特性分析

Analysis of Heat Storage and Release Characteristics of Mobile Interval Heat Accumulator

通过FLUENT软件对不同布置方式的蓄热器进行数值模拟,结果表明,采用间隔式蓄热器会使蓄热器的材料温度更高,前中期蓄放热速率更快:但存在很明显的区域不均匀的现象:具体表现为中心区域要较其他区域反应速率更快,温升明显更高。从模拟结果来看,此种布置方法虽然一定程度上节省了余热资源,但由于区域反应的不平衡,致使总反应时间滞后。将模拟所得到的数据整理结合云图分析出现“类死区现象的原因”,并在此基础上进行优化。具体优化方法主要有两个方面:改变肋片的几何构型、改变肋片的布置方式:另一方面在蓄热器的边璧区域使用导热系数更高的蓄热材料。通过对优化后蓄热器的蓄放热速率与优化前相比,发现蓄热器中出现的“类死区”的区域在优化后蓄放热性能均得到了很大的增强,蓄放热总时间分别减少了19.4%。

The numerical simulation of heat accumulators with different arrangement modes was carried out by FLUENT software.The results show that the temperature of the material of the heat accumulator is higher and the heat storage and release rate is faster in the first and middle period by using the spacer type heat accumulator.However,there is obvious regional inhomogeneity,the reaction rate in the central region is faster than that in other regions,and the temperature rise is significantly higher.According to the simulation results,although this arrangement method can save the waste heat resources to some extent,the total reaction time is delayed due to the im balance of regional reaction.The data obtained from the simulation were collated and combined with the cloud image to analyze the causes of the phenomenon of“dead zone like”,and optimized on this basis.The specific optimization method mainly has two aspects:changing the geometric configuration of the fin,changing the fin layout;On the other hand,heat storage materials with higher thermal conductivity are used in the side wall area of the heat accumulator.By comparing the heat storage and release rate of the regenerator after optimization with that before optimization,it is found that the heat storage and release performance of the regenerator in the“dead zone”area has been greatly enhanced after optimization,and the total heat storage and release time has been reduced by 19.4%respectively.