竖直壁面上含SO_(2)气体的锅炉烟气的低温冷凝特性  

Condensation performance of low temperature boiler flue gas containing SO_(2) on vertical wall

作　　者：张经伟 刘永阳 刘东 邵国栋 李元鲁 刘舫辰 杜文静[1] ZHANG Jingwei;LIU Yongyang;LIU Dong;SHAO Guodong;LI Yuanlu;LIU Fangchen;DU Wenjing(School of Energy and Power Engineering,Shandong University,Jinan 250061,Shandong,China;SEPCO1 Electric Power Construction Co.,Ltd.,Jinan 250131,Shandong,China)

机构地区：[1]山东大学能源与动力工程学院,山东济南250061 [2]中国电建集团山东电力建设第一工程有限公司,山东济南250131

出　　处：《化工学报》2021年第S01期475-481,共7页CIESC Journal

基　　金：山东省重大科技创新工程项目(2019JZZY010454)。

摘　　要：为求解竖直壁面上含有SO_(2)气体的锅炉烟气冷凝特性,采用Fluent数值计算软件,根据锅炉烟气酸露点温度的计算公式,通过自定义用户函数,求解了锅炉烟气在竖直平板上的流动和传热的基本变化规律。结果表明,在硫酸蒸气分数为1%~10%,壁温为300~450 K工况下,即使存在少量的SO_(2),也会和水蒸气生成H_(2)SO_(4),在壁面上产生冷凝,进而对壁面产生低温腐蚀。当壁面温度一定,在较低硫酸蒸气浓度时,硫酸蒸气浓度的增加将引起硫酸冷凝量的近似线性增长;当硫酸浓度一定时,过冷度的增加将导致硫酸冷凝量的增加,但是当过冷度增大到限定数值时,过冷度的影响较小。In order to solve the condensing performance of boiler flue gas containing SO_(2) on the vertical wall,based on the Fluent numerical simulation software,according to the calculation formula of the acid dew point temperature of the boiler flue gas,the user-define function(UDF)was used to solve this problem.On the working condition with sulfuric acid vapor fraction of 1%-10%and wall temperature of 300-450 K,numerical simulation results showed that even a small quantity of SO_(2) could form H_(2)SO_(4) with water vapor and condense on the wall surface.Therefore the low-temperature corrosion on the wall was produced.Simulation results revealed that when the condensing wall temperature was constant and the volume fraction of sulfuric acid vapor was small,the increase of volume fraction of sulfuric acid vapor caused an approximately linear increase of the condensation of sulfuric acid vapor.When the volume fraction of sulfuric acid vapor was constant,the increase of subcooling generated the increase of the sulfuric acid vapor condensation,but when the degree of subcooling reached a certain value,the effect of the subcooling was negative.

关 键 词：冷凝 腐蚀 气液两相流 相变 对流 

分 类 号：TK124[动力工程及工程热物理—工程热物理]