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An innovative method for waste heat recovery from flue gas treatment system through an additional economizer

Iliev Iliya Krastev, Kowalczyk Tomasz, Beloev Hristo Kvanov, Terziev Angel Kostadinov, Jesionek Krzysztof Jan, Badur Janusz

Archives of Thermodynamics

2022

Vol. 43, no 2

37--59

The usage of wet methods for flue gas dedusting from coalfired boilers is associated with significant heat losses and water resources. Widespread emulsifiers of the first and second generation are satisfactory in terms of flue gas cleaning efficiency (up to 99.5%), but at the same time do not create conditions for deeper waste heat recovery, leading to lowering the temperature of gases. Therefore, in the paper, an innovative modernization, including installing an additional economizer in front of the scrubber (emulsifier) is proposed, as part of the flue gas passes through a parallel bag filter. At the outlet of the emulsifier and the bag filter, the gases are mixed in a suitable ratio, whereby the gas mixture entering the stack does not create conditions for condensation processes in the stack.