Numerical Study on Deposition Characteristics of Sulfuric Acid Vapor on Heat Exchanger Surfaces

doi:10.7652/xjtuxb201311002

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Numerical Study on Deposition Characteristics of Sulfuric Acid Vapor on Heat Exchanger Surfaces

更新时间：2025-07-09

- Numerical Study on Deposition Characteristics of Sulfuric Acid Vapor on Heat Exchanger Surfaces
- Vol. 47, Issue 11, Pages: 7-13(2013)
- 作者机构：
  
  西安交通大学热流科学与工程教育部重点实验室,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201311002
  CLC： TK021.4
- Online First：10 November 2013，
  
  Published：2013
- 稿件说明：
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Numerical Study on Deposition Characteristics of Sulfuric Acid Vapor on Heat Exchanger Surfaces[J]. 2013, 47(11): 7-13.
DOI：

Numerical Study on Deposition Characteristics of Sulfuric Acid Vapor on Heat Exchanger Surfaces[J]. 2013, 47(11): 7-13. DOI： 10.7652/xjtuxb201311002.

摘要

为了预测换热器表面酸蒸气的凝结行为

发展了一种新的数值计算模型。该模型通过结合H

-H

O溶液的气液平衡实验数据和多元组分传输理论

能够实现壁面附近硫酸溶液(硫酸和水蒸气分压力)和烟气侧组分含量耦合

以及流体和固体界面耦合条件下凝结换热过程的数值求解。通过与已有实验结果的对比

验证了模型的可靠性。模型被用于一种在余热利用场合广泛采用的H型翅片管换热器

并给出了换热器表面的酸沉积率和酸液质量分数的分布。分析结果表明:在换热器翅片上

酸液质量分数的三维分布和翅片表面温度分布规律相一致; 水蒸气体积分数升高会导致酸液质量分数急剧下降和沉积率上升

增加换热器低温腐蚀的风险; 与此相反

增大烟气温度会导致酸液质量分数升高和沉积率下降

降低腐蚀的可能性。

Abstract

A new numerical model was developed to predict the sulfuric acid condensation behavior on the surfaces of heat exchangers. By correlating the vapor-liquid equilibrium(VLE)data of the H

-H

O solution from experiments with the multi-component diffusion theory

the proposed model can obtain the numerical solution of condensation heat transfer under the conditions of the coupled wall and fluid boundary condition and realize the coupling of the multi-components of flue gas and the sulfuric acid solution(saturated partial pressures of sulfuric acid and water vapor)near the wall. The numerical model was validated by the comparison of simulation results and available experimental data

and it was applied to a k

ind of H-type finned tube heat exchanger widely used in the field of waste heat recovery. The distributions of condensation rate and condensate mass fraction on the fin surface were achieved. The results show that the three-dimensional distribution of the acid solution mass fraction is consistent with that of the fin temperature. The increase in water vapor could result in a sharp reduction of the acid solution mass fraction and an increase in deposition

leading to a serious risk of low temperature corrosion. In contrast

increasing the flue gas temperature will reduce the corrosion risk by reducing the condensation rate and increasing the acid mass fraction.

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