管壳式相变蓄热器的蓄释热过程性能分析

doi:10.12096/j.2096-4528.pgt.23072

发电技术 ›› 2024, Vol. 45 ›› Issue (3): 508-516.DOI: 10.12096/j.2096-4528.pgt.23072

管壳式相变蓄热器的蓄释热过程性能分析

屠楠¹, 刘家琛¹, 徐静¹, 方嘉宾², 马彦花³

^1.西安工程大学机电工程学院，陕西省西安市 710600
^2.西安交通大学化学工程与技术学院，陕西省西安市 712000
^3.云南农业大学机电工程学院，云南省昆明市 650500

收稿日期:2023-08-30 修回日期:2023-10-10 出版日期:2024-06-30 发布日期:2024-07-01
通讯作者: 方嘉宾
作者简介:屠楠(1987)，女，博士，副教授，主要从事太阳能热发电技术研究，tu.nan@qq.com；
刘家琛(1998)，男，硕士研究生，主要从事太阳能相变储能技术研究，2621757565@qq.com；
方嘉宾(1983)，男，博士，副教授，主要从事太阳能热发电及热化学储能技术研究，本文通信作者，jiabinfang@xjtu.edu.cn。
基金资助:
陕西省重点研究计划项目(2022GXLH-01-08);陕西省秦创原“科学家+工程师”队伍建设项目(2022KXJ-179);中国电力建设股份有限公司研究中心定向资助计划(DJ-PTZX-2021-03)

Performance Analysis of Heat Storage and Release Process for a Shell-and-Tube Phase Change Heat Exchanger

Nan TU¹, Jiachen LIU¹, Jing XU¹, Jiabin FANG², Yanhua MA³

^1.School of Mechanical and Electrical Engineering, Xi’an Polytechnic University, Xi’an 710600, Shaanxi Province, China
^2.School of Chemical Engineering and Technology, Xi’an Jiaotong University, Xi’an 712000, Shaanxi Province, China
^3.School of Mechanical and Electrical Engineering, Yunnan Agricultural University, Kunming 650500, Yunnan Province, China

Received:2023-08-30 Revised:2023-10-10 Published:2024-06-30 Online:2024-07-01
Contact: Jiabin FANG
Supported by:
Key Research Project of Shaanxi Province(2022GXLH-01-08);Shaanxi Province Qin Chuang Yuan “Scientist & Engineer” Team Construction Project(2022KXJ-179);Directed Funding Program of Research Center of China Power Construction Company Limited(DJ-PTZX-2021-03)

摘要/Abstract

摘要：

目的探究相变蓄热器不同布置方式对相变过程的影响，进一步分析多管蓄热器的简化方式。方法基于焓-孔隙率法建立管壳式石蜡蓄热器蓄释热过程计算模型，研究卧式、立式布置下单管外石蜡的相变过程，并分别对比单管、多管蓄热器顺排及周期性错排等对其蓄释热过程的影响。结果卧式单管蓄热时长比立式缩短了18%，但二者释热时长相差不大；与蓄热过程不同，释热过程以热传导为主要传热方式，因此相对缓慢，释热时长相比蓄热时长增加了20%以上。多管蓄热器蓄释热过程所需时长略大于单管蓄热器，但其增加时长均未超过10%，蓄释热速率曲线基本与单管一致。通过进一步研究发现，当多管蓄热器中每根管周围包裹的石蜡体积及包裹方式相同时，不同排布方式不会对蓄释热过程产生较大影响。结论相比立式布置，卧式布置可有效提升单管外石蜡的熔化速度，且蓄热过程的强化效果相比释热过程更明显。此外，在分析多管蓄热器蓄释热过程性能时，可采用单管或部分周期性管道进行简化。

关键词: 太阳能, 相变蓄热器, 释热, 传热, 数值模拟

Abstract:

Objectives The influence of different placements of phase change heat exchangers on the phase change process was investigated, and the simplified mode of multi-tube heat exchangers was further analyzed. Methods Based on the enthalpy-porosity method, a calculation model for the melting and solidification process of the shell-and-tube paraffin heat exchanger was established, and the phase change process of paraffin outside the single-tube was investigated under horizontal and vertical placements. The effects of single-tube heat exchanger and multi-tube heat exchanger with straight and staggered rows on the melting and solidification process were compared, respectively. Results Full melting time of horizontal single-tube heat exchanger is 18% shorter than that of vertical, but the difference of full solidification time between the two is not significant. Unlike the melting process, the solidification process uses heat conduction as the main mode of heat transfer, so it is relatively slow, and the full solidification time is increased by more than 20% compared to the same period of full melting time. The time required for the melting and solidification process of multi-tube heat exchanger is slightly longer than that of the single-tube heat exchanger, but its increase in time is not more than 10%, and its melting and solidification rate curve is basically consistent with that of single-tube. Through further study, it is found that when the volume of paraffin wraps around each tube in the multi-tube heat exchanger and the wrapping method is the same, different arrangement methods of the multi-tube heat exchanger would not affect the melting and solidification process. Conclusions Compared with the vertical placement, the horizontal placement can effectively enhance the melting rate of paraffin outside the single-tube, and the enhancement effect of the melting process is more obvious than that of the solidification process. In addition, when analyzing the performance of the melting and solidification process of the multi-tube heat exchanger, the single-tube or part of the periodic tube can be used for simplification.

Key words: solar energy, phase change heat exchanger, heat release, heat transfer, numerical simulation

中图分类号:

TK 513.5

屠楠, 刘家琛, 徐静, 方嘉宾, 马彦花. 管壳式相变蓄热器的蓄释热过程性能分析[J]. 发电技术, 2024, 45(3): 508-516.

Nan TU, Jiachen LIU, Jing XU, Jiabin FANG, Yanhua MA. Performance Analysis of Heat Storage and Release Process for a Shell-and-Tube Phase Change Heat Exchanger[J]. Power Generation Technology, 2024, 45(3): 508-516.

图/表 12

图1 单管模型示意图

Fig. 1 Single tube model diagram

图2 不同排列方式下四管蓄热器模型及尺寸

Fig. 2 Models and dimensions of four tube heat storage unit in different tube arrangements

表1 石蜡RT50热物性参数

Tab. 1 Thermophysical properties of RT50

参数	数值
ρ_l/(kg/m³)	780
ρ_s/(kg/m³)	860
c_p /[J/(kg⋅K)]	2 000
k/[W/(m⋅K)]	0.2
L/(J/kg)	168 000
μ/[kg/(m⋅K)]	0.006
β/K^-1	0.000 6
T_s/K	318
T_l/K	324

图3 模型网格及时间步长无关性验证

Fig. 3 Model grid and time step independence verification

图4 模拟结果与文献[15]中实验结果的对比

Fig. 4 Comparison of simulation results and experimental results in the literature [15]

图5 卧式、立式单管蓄热及释热过程液相分数对比

Fig. 5 Liquid fraction of horizontal and vertical single tube units during charging and discharging

图6 卧式、立式单管蓄热器蓄热过程中间截面液相分数分布

Fig. 6 Liquid fraction counter of the middle section of horizontal and vertical single tube units during charging

图7 卧式、立式单管蓄热器释热过程中间截面液相分数分布

Fig. 7 Liquid fraction counter of the middle section of horizontal and vertical single tube units during discharging

图8 单管及不同布管方式下四管蓄热器蓄热过程中间截面液相分数分布

Fig. 8 Liquid fraction counter of the middle section of single tube and four tube heat storage units with different arrangements during charging

图9 单管及不同布管方式下四管蓄热器蓄热过程液相分数变化

Fig. 9 Liquid fraction of single tube and four tube heat storage units with different arrangements during charging

图10 单管及不同布管方式下四管蓄热器释热过程中间截面液相分数分布

Fig. 10 Liquid fraction counter of the middle section of single tube and four tube heat storage units with different arrangements during discharging

图11 单管及不同布管方式下四管蓄热器释热过程液相分数变化

Fig. 11 Liquid fraction of single tube and four tube heat storage units with different arrangements during discharging

参考文献 16

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管壳式相变蓄热器的蓄释热过程性能分析

Performance Analysis of Heat Storage and Release Process for a Shell-and-Tube Phase Change Heat Exchanger

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