THERMAL SCIENCE

International Scientific Journal

Branislav Repić

,

Milica R. Mladenović

,

Ana D. Marinković

INVESTIGATION OF ASH DEPOSIT FORMATION ON HEAT TRANSFER SURFACES OF BOILERS USING COALS AND BIOMASS

ABSTRACT
Combustion of coals and biomass in boiler furnaces leads to formation of fireside deposits on irradiated and convective surfaces. This problem is not a new one, but it became one of the main operational problems in boilers using low rank coal and some sort of biomass. In the paper presented are the results of research of ash deposit processes in laboratory conditions. An experimental furnace was used for these purposes. The experiments were performed on a tubular experimental furnace which ensures appropriate temperature and mass transfer conditions for physical and chemical transformations of the mineral matter of fuel as in real conditions. The main working parameters can be varied in wide ranges. The influence of grinding fineness, excess air and wall surface temperature was analysed. Also, an ash related problems during coal and biomass combustion was considered. Key empirical correlations for slagging and fouling were tested. Two types of Serbian coals (Kolubara and Kosovo) and several biomasses were analysed. It was shown that many sorts of biomass and Kosovo coal have a great propensity to slagging and fouling. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III42011: Development and improvement of technologies for energy efficient and environmentally sound use of several types of agricultural and forest biomass and possible utilization for cogeneration]
KEYWORDS
boiler, combustion, fouling, slagging, ash deposit, criterion, coal, biomass, laboratory furnace
PAPER SUBMITTED: 2018-04-13
PAPER REVISED: 2019-02-01
PAPER ACCEPTED: 2019-05-08
PUBLISHED ONLINE: 2019-07-06
DOI REFERENCE: https://doi.org/10.2298/TSCI180413285R
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 5, PAGES [S1575 - S1586]
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Investigation of ash deposit formation on heat transfer surfaces of boilers using coals and biomass

© 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