新型蓄热体结构设计及性能分析

doi:10.16085/j.issn.1000-6613.2024-1436

摘要/Abstract

摘要：

蓄热体广泛应用于瓦斯余热回收，其结构决定了余热回收效率。因此本研究旨在通过对比数值模拟分析，提出了一种改进的新型多层板式蓄热体设计方案，系统性地对其结构优化与性能特征进行了深入探讨。采用流固热耦合的方法对蓄热体的传热过程进行了数值模拟，重点分析了不同开孔形式（如通孔、双孔、双半孔）对蓄热体内气体流动、温度分布和压力分布的影响。研究结果显示，合理增加开孔不仅有助于改善蓄热体内部温度的均匀性，还能有效增强整体热性能。双孔结构的蓄热效果显著优于其他形式，其设计在减少沿程压力损失、提高蓄热效率以及增强热量传递能力方面具有突出的优势。此外，本文还为新型蓄热体结构优化设计提供了一种高效且可行的技术路径。

关键词: 蓄热, 余热回收, 流固热耦合, 结构优化

Abstract:

Regenerator is widely used in gas waste heat recovery and its structure determines the efficiency of waste heat recovery. Therefore, the aim of this study was to propose an improved design scheme of multi-layer plate regenerator by comparing the numerical simulation analysis, and systematically discuss its structural optimization and performance characteristics. The heat transfer process of regenerator was simulated by the method of fluid-solid-heat coupling. The different opening forms (such as through hole, double hole and double half hole), the influence on gas flow, temperature distribution and pressure distribution in regenerator were mainly analyzed. The results showed that reasonable increase of the opening could not only improve the uniformity of the internal temperature of the regenerator, but also enhance the overall thermal performance. The design of double-hole structure had prominent advantages in reducing pressure loss, improving heat storage efficiency and enhancing heat transfer capability. In addition, this paper also provided an efficient and feasible technical path for the optimal design of the new-type regenerator structure.

Key words: heat storage, waste heat recovery, thermal-fluid-solid coupling analysis, structural optimization

中图分类号:

TK02

杨俊辉, 袁君, 张继达, 王金海, 乔红斌, 蔡振义, 马中成. 新型蓄热体结构设计及性能分析[J]. 化工进展, 2024, 43(S1): 282-294.

YANG Junhui, YUAN Jun, ZHANG Jida, WANG Jinhai, QIAO Hongbin, CAI Zhenyi, MA Zhongcheng. Structural design and performance analysis of a new type of heat accumulator[J]. Chemical Industry and Engineering Progress, 2024, 43(S1): 282-294.

图/表 27

图1 多层板式型蓄热体

图2 蓄热体单元几何图

图3 蓄热体单片开孔布置图

表1 算例设置表

简称	开孔形式	开孔位置	开孔直径
Origin	无开孔	—	—
Case1-1	通孔	25%、50%、75%	4mm
Case1-2	通孔	25%、50%、75%	5mm
Case1-3	通孔	25%、50%、75%	6mm
Case2-1	双孔	25%、50%、75%	2mm
Case2-2	双孔	16.7%、33.3%、50%、66.7%、83.3%	2mm
Case2-3	双孔	12.5%、25%、37.5%、50%、62.5%、75%、82.5%	2mm
Case1-1	双通孔	25%、50%、75%	4mm
Case1-2	双通孔	25%、50%、75%	5mm
Case1-3	双通孔	25%、50%、75%	6mm

图4 固体域和流体域边界条件

图5 固体域和单层流体域网格图

表2 网格无关性表

网格数	升温/K	误差/%
2500000	776	—
3200000	781	0.69
5000000	786	0.64
6000000	788	0.25
7000000	789	0.13

图6 多层板式型蓄热体各剖面压力、温度、速度云图

图7 各通孔直径下的剖面压力云图

图8 通孔模型压力-深度曲线

图9 各通孔直径下的剖面温度云图

图10 通孔模型温度-深度曲线图

图11 各通孔直径下的剖面速度云图

图12 通孔模型速度-深度曲线图

图13 各双孔下的剖面压力云图

图14 双孔模型压力-深度曲线图

图15 各双孔下的剖面温度云图

图16 双孔模型温度-深度曲线图

图17 各双孔下的剖面速度云图

图18 双孔模型速度-深度曲线图

图19 各双半孔下的剖面压力云图

图20 双半孔模型压力-深度曲线图

图21 各双半孔下的剖面温度云图

图22 双半孔模型温度-深度曲线图

图23 各双半孔下的剖面速度云图

图24 双半孔模型速度-深度曲线图

图25 各开孔形式改进效果对比图

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