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Energy and economic analysis of flue gas heat recovery systems improving the energy efficiency of gas cogeneration units

Authors :
Dzierwa Piotr
Peret Patryk
Trojan Marcin
Kaczmarski Karol
Source :
E3S Web of Conferences, Vol 551, p 01006 (2024)
Publication Year :
2024
Publisher :
EDP Sciences, 2024.

Abstract

This paper presents the results of energy and economic analyses of a gas-fired CHP plant. The analyses were carried out for three variants of technical solutions to improve the thermal efficiency of the CHP plant. The fuel combustion process involves the generation of a large amount of heat. In addition, the heat is dissipated to the surroundings through the exhaust gas with a high temperature of 300÷350 °C. Therefore, to limit heat loss, a heat recovery system is used, which removes heat from the engine body and from the hot exhaust gases through a heat exchanger, allowing the exhaust gases to be cooled to a temperature of 100÷120 °C. In addition, heat is recovered from the oil cooling process and intercoolers. The recovered heat is usually supplied to the heating water in the district heating network. For the calculations, the temperature distribution of the return water from the district heating network during the year was assumed. First, the benefits of adding an additional economizer to pre-heat district heating water were analysed, Next, a heat recovery system was simulated to cool the flue gases to lower temperatures using an absorption heat pump or a compressor heat pump.

Subjects

Subjects :
Environmental sciences
GE1-350

Details

Language :
English, French
ISSN :
22671242
Volume :
551
Database :
Directory of Open Access Journals
Journal :
E3S Web of Conferences
Publication Type :
Academic Journal
Accession number :
edsdoj.7d6a213a360c4c32b4ebd556df4081c3
Document Type :
article
Full Text :
https://doi.org/10.1051/e3sconf/202455101006