THERMAL SCIENCE

International Scientific Journal

Shifeng Deng

,

Qinxin Zhao

,

Teng Qu

,

Ning Wang

,

Huaishuang Shao

REMOVAL PATTERN OF PARTICULATE MATTER FROM CONDENSING HEAT EXCHANGER AFTER WET DESULFURIZATION OF COAL-FIRED UNIT

ABSTRACT
The flue gas after wet desulfurization of coal-fired units still contains a large amount of particulate matter. Flue gas condensing heat exchangers are often used to further remove particulate matter. However, current research focuses on the overall removal effect of the heat exchangers, but ignores the difference of pollutant removal ability of the inner tube bundle along the flue gas-flow direction. This paper studied the correlation between pollutant removal and operating parameters of condensation heat exchanger, so as to make the removed amount of pollutants as large as possible. A field experimental platform was built on a 3 × 350 MW supercritical circulating fluidized bed coal-fired unit. The total amount of pollutants removed between the 3rd and 6th rows of tube bundles from the inlet of the heat exchanger was the largest. The removal of particulate matter near the outlet of the heat exchanger was the smallest. The highest removal rate of filterable particulate matter reached 76 %. The proportion of condensable particulate matter in the total removal of particulate matter reached around 90%. The mass ratio of both H2SO4 and SO3 to the removed condensable particulate matter were more than 9 %.
KEYWORDS
Flue gas after wet desulfurization, Filterable particulate matter, Condensable particulate matter, Grouped tube bundles, condensation
PAPER SUBMITTED: 2023-04-22
PAPER REVISED: 2023-05-25
PAPER ACCEPTED: 2023-06-12
PUBLISHED ONLINE: 2023-07-16
DOI REFERENCE: https://doi.org/10.2298/TSCI230422151D
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2024, VOLUME 28, ISSUE Issue 1, PAGES [489 - 498]
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Removal pattern of particulate matter from condensing heat exchanger after wet desulfurization of coal-fired unit

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence