Numerical investigation on acid vapor condensation characteristics of honeycomb H-type finned tube heat exchangers with hexagonal fins

IF 6.1 2区工程技术 Q2 ENERGY & FUELS Applied Thermal Engineering Pub Date : 2024-10-28 DOI:10.1016/j.applthermaleng.2024.124725

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Abstract

The low-temperature corrosion problem caused by sulfuric acid vapor condensation affects the safe operation of waste heat utilization system. A honeycomb H-type finned tube heat exchanger is proposed to further improve the thermal performance. However, the coupling effect between heat transfer and acid vapor condensation characteristics has not been clarified. In this work, the condensation characteristics of sulfuric acid and water vapor in flue gas were numerically investigated. First, the distribution characteristics of the fin surface temperature, acid concentration, acid vapor partial pressure and condensation rate of the single finned tube were analyzed, and the effects of the gas temperature and flow rate, water vapor concentration, and acid vapor concentration on the acid dew point and acid vapor condensation characteristics were investigated. The results show that increasing the water vapor concentration leads to a sharp decrease in the acid concentration and increases the corrosion risk. In contrast, increasing the flue gas temperature decreases the acid condensation rate and increases the acid concentration, which reduces the corrosion risk. Then, the thermal–hydraulic and acid condensation characteristics of the four optimized structures were comprehensively compared. Compared with that of the benchmark scheme, the overall performance of the optimal scheme improved by 75.0%, with an acceptable low-temperature corrosion rate.

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带六角形翅片的蜂巢式 H 型翅片管热交换器酸蒸汽冷凝特性的数值研究

硫酸蒸汽冷凝造成的低温腐蚀问题影响了余热利用系统的安全运行。为进一步提高热性能，提出了一种蜂窝式 H 型翅片管换热器。然而，传热与酸蒸气冷凝特性之间的耦合效应尚未明确。本研究对烟气中硫酸和水蒸气的冷凝特性进行了数值研究。首先，分析了单根翅片管的翅片表面温度、酸浓度、酸蒸气分压和冷凝速率的分布特性，并研究了气体温度和流速、水蒸气浓度、酸蒸气浓度对酸露点和酸蒸气冷凝特性的影响。结果表明，增加水蒸气浓度会导致酸浓度急剧下降，增加腐蚀风险。相反，提高烟气温度会降低酸冷凝速度，增加酸浓度，从而降低腐蚀风险。然后，对四种优化结构的热工水力特性和酸冷凝特性进行了综合比较。与基准方案相比，优化方案的整体性能提高了 75.0%，低温腐蚀率也在可接受范围内。

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来源期刊

Applied Thermal Engineering 工程技术-工程：机械

CiteScore

11.30

自引率

15.60%

发文量

1474

审稿时长

57 days

期刊介绍： Applied Thermal Engineering disseminates novel research related to the design, development and demonstration of components, devices, equipment, technologies and systems involving thermal processes for the production, storage, utilization and conservation of energy, with a focus on engineering application. The journal publishes high-quality and high-impact Original Research Articles, Review Articles, Short Communications and Letters to the Editor on cutting-edge innovations in research, and recent advances or issues of interest to the thermal engineering community.