排灌机械工程学报
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排灌机械工程学报  2019, Vol. 37 Issue (5): 420-426    DOI: 10.3969/j.issn.1674-8530.17.0130
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余热利用换热器硫酸和水蒸气耦合凝结数值模拟
江伟1*,蒋婷2, 朱相源3
1. 西北农林科技大学水利与建筑工程学院, 陕西 杨凌712100;2. 西安航天泵业有限公司, 陕西 西安, 710100;3. 西安交通大学热流科学与工程教育部重点试验室, 陕西 西安710049
Numerical study on coupled condensation of sulfuric acid and steam in heat exchanger for waste heat utilization
JIANG Wei1*, JIANG Ting2, ZHU Xiangyuan3
1. College of Water Resources and Architectural Engineering, North A&F University, Yangling, Shaanxi 712100, China; 2. Xi′an Ae-rospace Pump Co. Ltd., Xi′an, Shaanxi 710100, China;3. Key Laboratory of Thermal Fluid Science and Engineering of MOE, Xi′an Jiaotong University, Xi′an, Shaanxi 710049, China
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摘要 为准确预测烟气换热器表面酸凝结,了解其表面低温腐蚀特性,采用一种预测换热器表面酸蒸气凝结和水蒸气凝结耦合计算方法,通过结合H2SO4-H2O溶液的气液平衡数据和多元组分传输理论,建立了酸蒸气和水蒸气凝结的数值模型,并采用CFD软件对方形翅片管换热器的低温腐蚀特性进行数值分析,重点研究酸蒸气含量和水蒸气含量对酸沉积和腐蚀特性的影响.结果表明:换热器翅片表面酸液质量分数的分布和翅片表面温度的分布趋势一致,酸沉积主要发生在翅片前缘及换热管前方靠近管壁的翅片表面;水蒸气含量升高会导致翅片表面酸液质量分数下降和酸沉积率上升,增加换热器低温腐蚀的风险,结果可为换热器安全运行提供参考.
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江伟*
蒋婷
朱相源
关键词烟气换热器   翅片表面   低温腐蚀   数值模拟   酸沉积     
Abstract: Low-temperature corrosion characteristics of flue gas heat exchanger surfaces are the key factors affecting the reliability of equipment operation. And an accurate prediction of condensation of sulfuric acid vapor is crucial for investigation into the mechanism of low temperature corrosion characteristics. A coupled numerical model was adopted to predict the condensation of sulfuric acid vapor on the heat exchanger surfaces. By integrating the vapor-liquid equilibrium data of H2SO4-H2O solutions and multi-component diffusion theory, a model for the sulfuric acid pressure on the fin surfaces under the coupled condition is obtained. A rectangular type finned tube heat exchanger was employed to identify the effect of acid vapor content and water vapor content on the sulfuric acid condensation and corrosion by using CFD. The results show that the distribution of acid solution concentration is dependent on the fin temperature. The fin regions with higher temperature also are subject to a higher acid solution concentration. An increase in water vapor concentration can result in a sharp reduction in acid solution concentration and an increase in deposition, indicating a severe risk of low-temperature corrosion. The results can be used as a reference for the safety design of heat exchangers.
Key wordsflue gas heat exchanger   fin surface   low-temperature corrosion   numerical study   acid deposition   
收稿日期: 2017-06-09;
基金资助:国家自然科学基金资助项目(51509209),陕西省水利厅项目((2017slkj-5)第一作者简介:江伟(1985—),男,江西抚州人,讲师(通信作者,weijianglut@126com),主要从事叶轮机械内部流场分析与优化研究
引用本文:   
江伟*,蒋婷,朱相源. 余热利用换热器硫酸和水蒸气耦合凝结数值模拟[J]. 排灌机械工程学报, 2019, 37(5): 420-426.
JIANG Wei-*,JIANG Ting-,ZHU Xiang-Yuan-. Numerical study on coupled condensation of sulfuric acid and steam in heat exchanger for waste heat utilization[J]. Journal of Drainage and Irrigation Machinery Engin, 2019, 37(5): 420-426.
 
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