Condensation performance of low temperature boiler flue gas containing SO2 on vertical wall

doi:10.11949/0438-1157.20210295

Abstract

Abstract:

In order to solve the condensing performance of boiler flue gas containing SO₂ 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 SO₂ could form H₂SO₄ 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.

Key words: condensation, erosion, gas-liquid flow, phase change, convection

摘要：

为求解竖直壁面上含有SO₂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SO₂，也会和水蒸气生成H₂SO₄，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。

关键词: 冷凝, 腐蚀, 气液两相流, 相变, 对流

CLC Number:

TK 124

ZHANG Jingwei, LIU Yongyang, LIU Dong, SHAO Guodong, LI Yuanlu, LIU Fangchen, DU Wenjing. Condensation performance of low temperature boiler flue gas containing SO₂ on vertical wall[J]. CIESC Journal, 2021, 72(S1): 475-481.

张经伟, 刘永阳, 刘东, 邵国栋, 李元鲁, 刘舫辰, 杜文静. 竖直壁面上含SO₂气体的锅炉烟气的低温冷凝特性[J]. 化工学报, 2021, 72(S1): 475-481.

Figures/Tables 8

Fig1 Physical model

Fig.2 Model validation

Fig.3 Contour of gas-liquid distribution

Fig.4 Contour of temperature and velocity

Fig.5 Profiles of average liquid film thickness on different working conditions

Fig.6 Profiles of average heat transfer coefficient with subcooled temperature

Fig.7 Heat flux variation along flow path

Fig.8 Profiles of condensation rate on different conditions

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Condensation performance of low temperature boiler flue gas containing SO₂ on vertical wall

竖直壁面上含SO₂气体的锅炉烟气的低温冷凝特性

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Figures/Tables 8

References 27

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