THERMAL SCIENCE

International Scientific Journal

Yungang Wang

,

Jian Jiao

,

Yanjun Dai

,

Zhiwu Ke

,

Qinxin Zhao

,

Feixiang Li

STUDY ON HEAT TRANSFER CHARACTERISTICS OF FLUE GAS CONDENSATION IN NARROW GAP HEAT EXCHANGERS

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%.
KEYWORDS
condensation rate, flue gas, Narrow gap heat exchanger, heat transfer, latent heat
PAPER SUBMITTED: 2022-11-25
PAPER REVISED: 2023-04-03
PAPER ACCEPTED: 2023-04-05
PUBLISHED ONLINE: 2023-06-11
DOI REFERENCE: https://doi.org/10.2298/TSCI221125117W
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2023, VOLUME 27, ISSUE Issue 6, PAGES [4681 - 4693]
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Study on heat transfer characteristics of flue gas condensation in narrow gap heat exchangers

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