基于换热面积连续调节的单罐熔盐储热系统释热功率稳定性研究

doi:10.19799/j.cnki.2095-4239.2021.0353

储能科学与技术 ›› 2021, Vol. 10 ›› Issue (5): 1753-1759.doi: 10.19799/j.cnki.2095-4239.2021.0353

• 物理储能十年专刊·储热 • 上一篇下一篇

基于换热面积连续调节的单罐熔盐储热系统释热功率稳定性研究

陈晓彤¹(), 鹿院卫¹, 何聪¹, 宋文兵¹, 吴玉庭¹, 杨桂春²

^1.北京工业大学传热强化与过程节能教育部重点实验室暨传热与能源利用北京市重点实验室，北京 100124
^2.中国寰球工程有限公司，北京 100012

收稿日期:2021-07-14 修回日期:2021-07-18 出版日期:2021-09-05 发布日期:2021-09-08
作者简介:陈晓彤（1996—），男，硕士，研究方向为单罐熔盐储热技术，E-mail：chenxiaotong1996@126.com|鹿院卫，教授，研究方
基金资助:
国家重点研发计划项目(2017YFB0903603);国家自然科学基金项目(52076006);青海省科技计划项目(2017-GX-A3)

Heat-release stability of single tank molten salt heat storage system based on continuous regulation of heat exchange area

Xiaotong CHEN¹(), Yuanwei LU¹, Cong HE¹, Wenbing SONG¹, Yuting WU¹, Guichun YANG²

^1.Key Laboratory of Enhanced Heat Transfer and Energy Conservation of Ministry of Education and Key Laboratory
of Heat Transfer and Energy Conversion of Beijing, Beijing University of Technology, Beijing 100124, China

Received:2021-07-14 Revised:2021-07-18 Online:2021-09-05 Published:2021-09-08

摘要/Abstract

摘要：

将盘管换热器内置于单罐熔盐储热系统时，系统的释热功率会随释热时间的延长而降低。为了实现稳定的释热，本文以低熔点熔盐为储热介质，以空气为释热介质，通过缩小实验分析了换热器面积连续变化时对单罐熔盐储热系统释热功率的影响，以及使用不同换热面积调节方法对释热稳定性的影响。结果表明，通过连续调节换热器面积，可以实现换热器出口温度长时间稳定于设定目标值，且释热功率也能够基本稳定。通过实验分析，本文优选出了一种释热效果较为稳定的换热面积连续调节方法，稳定释热时间占总释热时间近98%。通过对换热面积的连续调节，可以获得稳定的换热器出口温度和释热功率。

关键词: 熔盐, 换热面积, 释热功率, 出口温度

Abstract:

When a coil heat exchanger is placed in a single-tank molten-salt heat storage system, the heat release power of the system decreases with an increase in the heat release time. To achieve stable heat release, in this study, the influence of the change in the heat exchange area on the heat release power of single-tank heat storage systems was examined by experiment using low-melting-point molten salt and air as the heat extraction mediums. By continuously adjusting the heat exchanger area, the outlet temperature of the heat exchanger could be stabilized at the set target value for a long time, and the heat release power could be stabilized. Experimental analysis demonstrated that continuous adjustment of the heat transfer area with a stable heat release is preferred, and the stable heat release time accounts for ～98% of the total heat release time. By continuously adjusting the heat exchange area, stable outlet temperature and heat release power could be obtained.

Key words: molten salt, heat exchange area, heat release power, outlet temperature

中图分类号:

TK 124

陈晓彤, 鹿院卫, 何聪, 宋文兵, 吴玉庭, 杨桂春. 基于换热面积连续调节的单罐熔盐储热系统释热功率稳定性研究[J]. 储能科学与技术, 2021, 10(5): 1753-1759.

Xiaotong CHEN, Yuanwei LU, Cong HE, Wenbing SONG, Yuting WU, Guichun YANG. Heat-release stability of single tank molten salt heat storage system based on continuous regulation of heat exchange area[J]. Energy Storage Science and Technology, 2021, 10(5): 1753-1759.

图/表 13

图1

表1

二元硝酸盐的物性参数"

参数	数值
熔点/℃	85.4
分解温度/℃	612
密度/(kg·m^-3)	$ρ s = 2083.486 - 0.7484 T$
比热容/(J·℃^-1)	$c p s = 1450 + 0.345 T$
导热系数/(W·℃^-1)	$λ s = 0.5082 + 1.167 × 10 - 4 T$
潜热/(kJ·kg^-1)	106.9

表1

图2

表2

不同整定方法的整定公式"

整定方法	K_p	T_i	T_d
C-c法	$K p = T 1 K τ (43 + τ 4 T 1)$	$T i = τ (32 T 1 + 6 τ) 13 T 1 + 8 τ$	$T d = 4 T 1 τ 11 T 1 + 2 τ$
Lopze法	$K p = 1.357 K (τ T 1) - 0.947$	$T i = 1.176 T 1 τ T 1 0.738$	$T d = 0.381 (τ T 1) 0.995$
Mcp法	$K p = 1 K 4 T 1 + τ 3 64 τ T 1 2 - 1$	$T i = 1024 T 1 3 τ 2 4 T 1 + τ 4 T 1 + τ 3 64 τ T 1 2 - 1$	$T d = 4 T 1 + τ 2 10.67 T 1 - T 1 - τ 4 T 1 + τ 3 64 τ T 1 2 - 1$
Z-N法	$K p = 1.2 T 1 K τ$	$T i = 2 T 1$	$T d = T 1 2$

表2

图3

表3

图4

图5

图6

图7

图8

图9

图10

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整定方法	K_p	T_i	T_d
C-c法	1.702	37.369	6.218
Lopze法	1.345	52.467	13.117
Mcp法	0.845	24.691	0.282
Z-N法	1.036	36.377	7.679

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基于换热面积连续调节的单罐熔盐储热系统释热功率稳定性研究

Heat-release stability of single tank molten salt heat storage system based on continuous regulation of heat exchange area

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