带中间通道的蓄热体结构设计及放热性能研究
摘要:固体蓄热技术将非峰值电能转化为热能，对消纳电网富余电能、平衡峰谷负荷以及减少环境污染具有积极意义。针对现有固体蓄热装置取热不均问题，提出一种新型结构蓄热体，在通风孔道内设计中间通道。利用Fluent建立蓄热体数值模型，研究了新型结构蓄热体放热时的温度分布和通风孔道内的流速分布，并与无中间连通结构蓄热体进行了对比分析。研究表明：中间连通结构提高了换热效率，减轻了热堆积现象；新型结构蓄热体相比于无中间连通结构，放热过程中平均温度下降37～68 ℃，最高降幅22.8%，最大温差下降27～60 ℃，最高降幅48.2%；中间连通结构使通风孔道中心处流速相对标准偏差下降45.4%，提高了流场均匀度；沿竖直方向的中间连通结构使蓄热体竖直方向温度分布更均匀，且未对水平方向的温度均匀性造成恶化影响。
Abstract：Solid state heat storage technology has positive significance in consuming surplus electricity from the power grid, balancing peak and valley loads, and reducing environmental pollution by converting nonpeak electricity into thermal energy. In response to the problem of uneven heat extraction in existing solid heat storage devices, a new type of structural heat storage body is proposed, which designs an intermediate channel in the ventilation duct. The numerical model of the heat storage body was established by using Fluent. The temperature distribution and the velocity distribution in the ventilation duct of the new heat storage body when releasing heat are studied, and compared with the structure without intermediate connection. The research shows that the middle connected structure improves heat transfer efficiency and reduces heat accumulation phenomenon. Compared with the structure without intermediate connection, the average temperature of the new structure heat storage body is reduced by 37~68 ℃, with a maximum reduction of 22.8%, and the maximum temperature difference is reduced by 27~60 ℃, with a maximum reduction of 48.2%. The middle connected structure reduces the relative standard deviation of flow velocity at the center of the ventilation duct by 45.4%, improving the uniformity of the flow field. The middle connected structure along the vertical direction makes the temperature distribution of the heat storage body more uniform in the vertical direction, and does not deteriorate the temperature uniformity in the horizontal direction.
标题：带中间通道的蓄热体结构设计及放热性能研究
title:Structural Design and Heat Release Performance Study of Heat Storage Body With Intermediate Channels
作者：徐迅,顾帅,鞠贵冬
authors:XU Xun,GU Shuai,JU Guidong
关键词：固体蓄热,结构设计,数值模拟,放热性能,流场均匀度,
keywords:solid heat storage,structural design,numerical simulation,heat release performance,uniformity of flow field,
发表日期：2023-10-12
- 文件大小:
- 1.55 MB
- 下载次数:
- 60
-
高速下载
|
|
