Study on heat transfer characteristics of flue gas condensation in narrow gap heat exchangers
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Published:2023
Issue:6 Part A
Volume:27
Page:4681-4693
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ISSN:0354-9836
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Container-title:Thermal Science
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language:en
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Short-container-title:THERM SCI
Author:
Wang Yungang1, Jiao Jian1, Dai Yanjun1, Ke Zhiwu2, Zhao Qinxin1, Li Feixiang3
Affiliation:
1. Key Laboratory of Thermo-Fluid Science and Engineering, Ministry of Education, Xi´an Jiaotong University, Xi´an, Shaanxi, China 2. Wuhan Second Ship Design and Research Institute, Wuhan, China 3. Hubei Special Equipment Inspection and Testing Institute, Wuhan, Hubei, China
Abstract
Flue gas after wet desulfurization contains a large quantity of water vapor, as well as a small amount of fine particulate matter, acid and other pollutants. Direct emissions will cause haze and environmental pollution. Flue gas condenser can effectively recover latent heat of vaporization and remove these pollutants. However, the traditional flue gas condenser has disadvantages such as large volume, low heat exchange efficiency and easy blockage. To overcome these problems, a new type narrow gap heat exchanger, which is easy to detach and clean, is proposed. Then, the flue gas condensation characteristic is experimentally investigated. The factors including velocity and temperature of flue gas, flow and temperature of cooling water are studied on heat transfer coefficient and the condensation rate. The results indicate that the overall heat transfer coefficient is seven times of convection heat transfer coefficient, and the condensation rate can reach more than 60%. As the cooling water temperature increases, the condensation rate and condensation heat transfer coefficient gradually decrease. With the increasing of the flue gas velocity, condensation rate gradually decreases and condensation heat transfer coefficient gradually increases. Finally, the dimensionless correlation of Nusselt number is carried out, and the error is within 10%.
Publisher
National Library of Serbia
Subject
Renewable Energy, Sustainability and the Environment
Reference30 articles.
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