波纹板对湿空气冷凝传热特性影响的实验研究

doi:10.16085/j.issn.1000-6613.2022-2018

摘要/Abstract

摘要：

为推进节能减排，进行烟气“消白”，减少水蒸气温室效应，本文基于不同换热板结构的大通道板式换热器，通过搭建回转风洞冷凝换热实验台，研究低温湿空气凝结，测定湿空气的凝结水量和进出口物性参数，获得不同波纹板结构的平均传热系数，并通过改变湿空气的工况参数，研究分析湿空气冷凝换热过程的影响因素。研究结果表明：在85~140℃范围内，湿空气的传热系数随入口温度的增加而减小；在相同入口温度下，湿空气含湿量越低，Re对冷凝传热系数影响越小。随着风速增加，湿空气凝结量逐渐减少；随着Re增加，波纹板和锯齿板的冷凝传热系数均随之提高。在相同Re数下，波纹板的传热系数大于锯齿板。采用波纹板烟气换热器，可更有效凝结回收烟气中饱和水蒸气。

关键词: 湿空气, 板式结构, 入口风温, 风速, 冷凝换热

Abstract:

In order to promote energy conservation and emission reduction, and reduce the flue gas "white" and the steam greenhouse effect, the heat exchanger plate with different structure of channel through constructing revolving wind tunnel of condensation heat transfer experiment, study the low temperature wet air condensation, the determination of water condensation in wet air and physical parameters of import and export, have different average heat transfer coefficient of corrugated plate structure, and by changing the parameters of wet air condition, research and analysis the influence factors of wet air condensation heat transfer process. The results showed that the heat transfer coefficient of wet air decreased with the increase of inlet temperature from 85℃ to 140℃. At the same inlet temperature, the lower the moisture content of the wet air, the smaller the influence of Re on the heat transfer coefficient of condensation. With the increase of wind speed, the condensation of wet air decreased gradually. Under the same wind speed and inlet air temperature, the condensation heat transfer coefficient of corrugated plate was higher than that of sawtooth plate and horizontal plate. The use of corrugated sheet smoke heat exchanger can condense and recover saturated water vapor in flue gas more effectively.

Key words: moist air, plate structure, inlet air temperature, air velocity, condensation heat transfer

中图分类号:

TK11

纪国剑, 尹琦瑞, 陆蓓蓓, 黄鹏圆, 周晓庆, 顾金铭. 波纹板对湿空气冷凝传热特性影响的实验研究[J]. 化工进展, 2023, 42(10): 5076-5082.

JI Guojian, YIN Qirui, LU Beibei, HUANG Pengyuan, ZHOU Xiaoqing, GU Jinming. Experimental research on the effect of corrugated plates on the condensation heat transfer characteristics of humid air[J]. Chemical Industry and Engineering Progress, 2023, 42(10): 5076-5082.

图/表 12

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参数	波纹板	锯齿板	水平板
长度L/mm	242	242	242
高度H/mm	544	544	544
板厚δ/mm	2	2	2
烟道宽度d/mm	25	25	25
冷流道宽度d_r/mm	25	25	25
波纹高度M/mm	10	—	—
波纹节距N/mm	20	—	—
锯齿高度S/mm	—	10	—
锯齿节距R/mm	—	20	—
形状	Asinωt三角函数	正三角形	—
风速范围V/m·s^-1	11~13.5	9~12	11~18
气体入口温度范围T/℃	70~145	70~130	70~140
空气初始含湿量/g·(kg干空气)^-1	0，120	0，120	0，120

参数	波纹板	锯齿板	水平板
长度L/mm	242	242	242
高度H/mm	544	544	544
板厚δ/mm	2	2	2
烟道宽度d/mm	25	25	25
冷流道宽度d_r/mm	25	25	25
波纹高度M/mm	10	—	—
波纹节距N/mm	20	—	—
锯齿高度S/mm	—	10	—
锯齿节距R/mm	—	20	—
形状	Asinωt三角函数	正三角形	—
风速范围V/m·s^-1	11~13.5	9~12	11~18
气体入口温度范围T/℃	70~145	70~130	70~140
空气初始含湿量/g·(kg干空气)^-1	0，120	0，120	0，120

测试元件及仪器名称	量程	精度	温度范围
热电偶PT100	0~500℃	1.0级	-200~850℃
LUGB-173/15/p/5型涡街流量计	15~381m³·h^-1	1.0级	0~250℃
LTWLUGB-DN25型涡街流量计	8~55m³·h^-1	1.5级	0~250℃
WSD-2000H超声波流量计	0.01~32m·s^-1	1.0级	-30~160℃
精密压力表	0~1.6MPa	0.4级	0~200℃
量筒	0~100mL	0.1mL	—
34970a数据采集器	—	1.0级	—

测试元件及仪器名称	量程	精度	温度范围
热电偶PT100	0~500℃	1.0级	-200~850℃
LUGB-173/15/p/5型涡街流量计	15~381m³·h^-1	1.0级	0~250℃
LTWLUGB-DN25型涡街流量计	8~55m³·h^-1	1.5级	0~250℃
WSD-2000H超声波流量计	0.01~32m·s^-1	1.0级	-30~160℃
精密压力表	0~1.6MPa	0.4级	0~200℃
量筒	0~100mL	0.1mL	—
34970a数据采集器	—	1.0级	—

温度/℃	ν_干空气/10^-6N·s·m^-2	ν_湿空气/10^-6N·s·m^-2
80	20.6	19.6
90	21.1	20.0
100	21.5	20.4
110	21.9	20.8
120	22.4	21.3
130	22.8	21.7
140	23.2	22.1
150	23.7	22.5