THERMAL SCIENCE

International Scientific Journal

Victoria Kornienko

,

Mykola Radchenko

,

Roman Radchenko

,

Dmytro Konovalov

,

Andrii Andreev

,

Maxim Pyrysunko

IMPROVING THE EFFICIENCY OF HEAT RECOVERY CIRCUITS OF COGENERATION PLANTS WITH COMBUSTION OF WATER-FUEL EMULSIONS

ABSTRACT
When using modern highly efficient internal combustion engines with lowered potential of exhaust heat the heat recovery systems receive increasing attention. The efficiency of combustion exhaust heat recovery at the low potential level can be enhanced by deep cooling the combustion products below a dew point temperature, which is practically the only possibility for reducing the temperature of boiler exhaust gas, while ensuring the reliability, environmental friendliness and economy of power plant. The aim of research is to investigate the influence of multiplicity of circulation and temperature difference at the exit of exhaust gas boiler heating surfaces, which values are varying as 20°C, 15°C, and 10°C on exhaust gas boiler characteristics. The calculations were performed to compare the constructive and thermal characteristics of the various waste heat recovery circuits and exhaust gas boiler of ship power plant. Their results showed that due to application of condensing heating surfaces in exhaust gas boiler the total heat capacity and steam capacity of exhaust gas boiler increases. The increase of exhaust gas boiler heat capacity is proportional to the growth of its overall dimensions. A direct-flow design of the boiler provides a significant increase in heat efficiency and decrease in dimensions. In addition, a direct-flow boiler circuit does not need steam separator, circulation pump, the capital cost of which is about half (or even more) of heating surface cost.
KEYWORDS
exhaust gas boiler, internal combustion engines, afterburning
PAPER SUBMITTED: 2020-01-16
PAPER REVISED: 2020-03-01
PAPER ACCEPTED: 2020-03-27
PUBLISHED ONLINE: 2020-04-04
DOI REFERENCE: https://doi.org/10.2298/TSCI200116154K
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2021, VOLUME 25, ISSUE Issue 1, PAGES [791 - 800]
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Improving the efficiency of heat recovery circuits of cogeneration plants with combustion of water-fuel emulsions

© 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