自流式空气除尘系统管道中过饱和度分布特征  

Distribution characteristics of supersaturation in pipeline of gravity air dust removal system

作　　者：代安稳 张军[1] 尹杰 叶晓辉 DAI Anwen;ZHANG Jun;YIN Jie;YE Xiaohui(School of Energy and Environment,Southeast University,Nanjing 210096,China)

机构地区：[1]东南大学能源与环境学院,江苏南京210096

出　　处：《中南大学学报（自然科学版）》2021年第12期4252-4261,共10页Journal of Central South University:Science and Technology

基　　金：国家自然科学基金资助项目(51876038)。

摘　　要：为了探究自流式空气除尘系统的过饱和度,为系统优化提供依据,首先,简化自流式空气除尘系统,构建物理和数学模型;其次,使用Fluent用户自定义标量(UDS)对水汽相变传热传质模型进行计算,研究自然对流情况下管道直径、进口空气温度、壁面热水温度、进口空气湿度及热水加入位置等因素对管道中过饱和度分布的影响;最后,使用响应面分析法进行三因素三水平单响应试验设计,确定管道直径、热水温度及热水加入位置对过饱和度的影响程度。研究结果表明:随着管道直径增加,平均过饱和度呈现出先升高后降低的趋势;平均过饱和度随着空气与热水温差增大而增大;进口空气相对湿度对过饱和度的影响较小;相较于热水的全覆盖,热水加入位置靠近管道出口更有利于提高管道的过饱和度;热水温度对过饱和度影响要远大于管道直径与热水加入位置的影响,管道直径与热水加入位置对过饱和度影响相近。在优化系统工况参数时,可着重考虑热水温度的影响,而将管道直径及热水加入位置作为次要因素考虑。The supersaturation level of gravity air dust removal system was explored to provide a basis for system optimization.Firstly,the gravity air dust removal system was simplified and physical and mathematical models were constructed.Secondly,Fluent user-defined scalar(UDS)was used to analyze water vapor phase.The variable heat and mass transfer models were calculated.The influence of factors such as pipe diameter,inlet air temperature,wall hot water temperature,inlet air humidity and hot water adding position on the distribution of supersaturation in the pipe during natural convection was studied.Finally,a three-factor three-level single response test design was carried out using response surface analysis to determine the degree of influence of pipe diameter,hot water temperature and hot water addition position on supersaturation.The results show that as the pipe diameter increases,the average supersaturation increases firstly and then decreases.The average supersaturation increases with the increase of the temperature difference between air and hot water.The relative humidity of the inlet air has little effect on the degree of supersaturation.Compared with the full coverage of hot water,it is more beneficial to increase the supersaturation level of the pipeline when the hot water is added to the location close to the outlet of the pipeline.The hot water temperature has a much greater impact on the supersaturation than the diameter of the pipeline and the location of hot water.The diameter and the position where the hot water is added have the same effect on the supersaturation.When optimizing the system working condition parameters,the influence of hot water temperature can be emphatically considered and the pipe diameter and hot water adding position can be considered as secondary factors.

关 键 词：PM_(2.5) 过饱和度 水汽相变 FLUENT 

分 类 号：TK16[动力工程及工程热物理—热能工程]