气液交叉流阵列PM2.5热泳和扩散泳拟传质模型

doi:10.11949/j.issn.0438-1157.20181294

摘要/Abstract

摘要：

基于气溶胶中PM2.5微细颗粒物拟流体特性，对气液交叉流阵列中PM2.5在气溶胶流体传热传质边界层内热泳和扩散泳运动进行拟传质机理分析，与跟随气体的对流传质相叠加，建立了气液交叉流阵列PM2.5热泳和扩散泳拟传质模型，并进行了实验检验。实验在固定对流条件下，考察了不同气液相温度差导致的热泳、不同气相湿度差导致的扩散泳和颗粒粒径等因素对气液交叉流阵列PM2.5拟传质系数的影响。实验数据统计值与模型表达趋势一致，在初始温差40℃、初始湿度0.118 kg/kg条件下，100排气液交叉流阵列PM2.5拟传质系数模型预测值为3.33×10^-3 m/s、实验值为3.75×10^-3 m/s。

关键词: PM2.5, 拟传质模型, 气液交叉流, 热泳, 扩散泳

Abstract:

Based on the pseudo-fluid characteristics of PM2.5 in aerosol, the pseudo mass transfer mechanism of PM2.5 in gas-liquid heat and mass transfer boundary layer was analyzed, considering the convective mass transfer of PM2.5 caused by thermophoresis, diffusiophoresis and the gas movement, a pseudo mass transfer model of PM2.5 in gas-liquid cross flow array based on thermophoresis and diffusiophoresis is established, and the accuracy of the model is verified through experiments. The influencing of thermophoresis caused by gas-liquid temperature difference, diffusiophoresis caused by gas-liquid humidity difference and particle size on the pseudo mass transfer coefficient of PM2.5 was investigated under fixed convection conditions. The experimental data statistics are consistent with the model expression trend. Under the initial temperature difference of 40℃ and initial humidity of 0.118 kg/kg, the predicted value of the PM2.5 pseudo-mass transfer coefficient model of the exhaust gas cross-flow array is 3.33×10^-3 m/s, experimental value 3.75×10^-3 m/s.

Key words: PM2.5, pseudo mass transfer model, gas-liquid cross flow, thermophoresis, diffusiophoresis

中图分类号:

TQ 019

杨海涛, 郑志坚, 朱家骅, 陈倬, 杨晨鹏, 段旬. 气液交叉流阵列PM2.5热泳和扩散泳拟传质模型[J]. 化工学报, 2019, 70(6): 2139-2146.

Haitao YANG, Zhijian ZHENG, Jiahua ZHU, Zhuo CHEN, Chenpeng YANG, Xun DUAN. Pseudo mass transfer model of PM2.5 thermophoresis and diffusiophoresis in gas-liquid cross flow array[J]. CIESC Journal, 2019, 70(6): 2139-2146.

图/表 9

图1 含尘含湿气溶胶流体横掠气液交叉流阵列的模型机理

Fig.1 Model mechanism of gas flowing cross gas-liquid cross flow array

图2 含尘含湿气溶胶流体横掠液膜柱的温度分布Fig.2 Temperature field of gas flowing cross falling film column

图3 PM2.5跟随气体的对流扩散拟传质系数k TP随气速的变化

Fig.3 Pseudo mass transfer coefficient of PM2.5 caused by gas movement (k TP) with different inlet gas velocity

图4 气溶胶流体横掠气液交叉流阵列PM2.5拟传质系数

Fig.4 Pseudo mass transfer coefficient of PM2.5 by a single column of gas-liquid cross flow array

图5 气液交叉流阵列PM2.5拟传质系数测试实验流程

Fig.5 Experimental flow chart of gas-liquid cross flow array to measure pseudo mass transfer coefficient of PM2.5

图6 入口处Al2O3颗粒粒径分布

Fig.6 Al2O3 particles size distribution of inlet

表1 实验入口条件

Table 1 Test conditions of gas inlet

工况	气体入口温度T/℃	气体相对湿度φ	液膜温度T _w/℃	温度差/℃	气体初始湿度/(kg/kg)	液膜表面湿度/(kg/kg)	湿度差/(kg/kg)
a	20	1	20	0	0.016	0.016	0
b	60	0.118	20	40	0.016	0.016	0
c	60	0.232	20	40	0.032	0.016	0.016
d	60	0.757	20	40	0.118	0.016	0.102

图7 不同条件下气溶胶流体横掠100排气液交叉流阵列PM2.5的拟传质系数

Fig.7 Pseudo mass transfer coefficient of PM2.5 in 100 columns with different inlet gas operation parameters

图8 气溶胶流体横掠气液交叉流阵列（20、40、100排液膜柱）PM2.5的拟传质系数

Fig.8 Pseudo mass transfer coefficient of PM2.5 in gas-liquid cross flow array (20, 40, 100 columns)

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