Chemical Industry and Engineering Progress ›› 2023, Vol. 42 ›› Issue (8): 4230-4237.DOI: 10.16085/j.issn.1000-6613.2022-1769

• Energy processes and technology • Previous Articles     Next Articles

Experimental analysis of condensation heat transfer and synergistic desulfurization

WANG Yungang(), JIAO Jian, DENG Shifeng, ZHAO Qinxin(), SHAO Huaishuang   

  1. Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi’an Jiaotong University,Xi’an 710049, Shaanxi, China
  • Received:2022-09-21 Revised:2022-12-03 Online:2023-09-19 Published:2023-08-15
  • Contact: ZHAO Qinxin

冷凝换热与协同脱硫性能实验分析

王云刚(), 焦健, 邓世丰, 赵钦新(), 邵怀爽   

  1. 西安交通大学热流科学与工程教育部重点实验室,陕西 西安 710049
  • 通讯作者: 赵钦新
  • 作者简介:王云刚(1983—),男,博士,研究方向为工业过程强化传热与节能新技术。E-mail:ygwang1986@xjtu.edu.cn
  • 基金资助:
    国家自然科学基金面上项目(52276085);西安市科技计划(20KYPT0001-11-2)

Abstract:

Exhaust from oil-fired and gas-fired boilers contains a large amount of water vapor, and direct emissions will not only result in the waste of resources and energy, but also the formation of white smoke, causing visual pollution and partial haze. Condensation heat transfer technology can effectively recover the waste heat of the exhaust gas and synergistically remove some pollutants. A hot-state experiment for natural gas combustion was designed. It was built to research on the characteristics of condensation heat transfer and decontamination for two heat exchangers with horizontal tubes. The influence of the excess air coefficient and the feed water temperature on the condensation heat transfer was analyzed, and two non-dimensional correlation formulae for the water vapor condensation ratio of 2205 stainless steel/PTFE heat exchangers were fitted. In addition, based on the established SO3/H2SO4 atomization evaporation experimental system, the condensation removal rule of SO3/H2SO4 under different working conditions was further analyzed. The results showed that the condensation rate of 2205 heat exchanger was 19.53%—85.57%, and the maximum condensation heat transfer coefficient was 250.68W/(m2·K). The condensation rate of fluorine plastic heat exchanger was 4.92%—42.04%, and the maximum condensation heat transfer coefficient was 131.09W/(m2·K). At the same time, the condensation removal rate of SO3/H2SO4 increased with the increase of the water supply temperature, and decreased with the increase of the concentration of SO3/H2SO4. However, the absolute condensation amount of H2SO4 increased within a certain period of time, and the maximum condensation removal rate of SO3/H2SO4 reached more than 18%.

Key words: flue gas, heat exchangers, heat transfer, condensation, desulfurization

摘要:

锅炉排烟中含有大量水蒸气,直接排放不仅会造成资源和能源的浪费,还会形成白烟,造成视觉污染和局部雾霾,采用凝结换热技术可有效回收排烟余热,并协同脱除部分污染物。本文设计并搭建了天然气燃烧热态实验台,对烟气横向冲刷水平光管的凝结传热特性展开实验研究,分析对比了过量空气系数、给水温度对凝结换热强弱的影响,拟合出2205不锈钢/PTFE两种换热器的水蒸气冷凝率量纲为1准则关联式。此外,基于搭建的SO3/H2SO4雾化蒸发冷凝实验系统,进一步研究分析了不同工况下烟气中SO3/H2SO4的冷凝脱除规律。实验结果表明,2205冷凝换热器冷凝率为19.53%~85.57%,最大凝结换热系数为250.68W/(m2·K);氟塑料冷凝换热器冷凝率为4.92%~42.04%,最大凝结换热系数为131.09W/(m2·K)。同时,SO3/H2SO4气体冷凝脱除率随着给水温度的升高而增大,随着SO3/H2SO4气体浓度的增大而减小,但一定时间内的H2SO4绝对冷凝量在增加,SO3/H2SO4最大冷凝脱除率达到18%以上。

关键词: 烟道气, 换热器, 传热, 凝结, 脱硫

CLC Number: 

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