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Numerical Analysis on the Flue Gas Temperature Maintenance System of a Solid Fuel-Fired Boiler Operating at Minimum Loads

Institute of Heat Engineering, Faculty of Power and Aeronautical Engineering, Warsaw University of Technology, Nowowiejska 21/25, 00-665 Warsaw, Poland
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Academic Editor: Marcin Kamiński
Energies 2021, 14(15), 4420; https://doi.org/10.3390/en14154420
Received: 26 June 2021 / Revised: 17 July 2021 / Accepted: 19 July 2021 / Published: 22 July 2021
Currently, energy policy is associated with the increase in the share of renewable sources in systemic energy production. Due to this trend, coal-fired power units must increase their work flexibility. Adapting a coal power plant to work with a lower load often causes the issue of maintaining the temperature before the selective catalytic reduction (SCR) installation at a sufficiently high level. This paper presents a CFD analysis of the mixing area of two flue gas streams before the SCR installation with various methods for mixing flue gas streams. The novelty of the work is mixing the flue gas streams of different temperatures using a flap shape developed by the authors. A series of numerical simulations were performed to develop the location and method of introducing the higher temperature gas, obtaining a uniform distribution of the exhaust gas temperature. The simulation scheme was applied to a series of geometrical modifications of the boundary conditions. The tested solution using only a single, straight flap in the flue gas duct allows the amplitude to be reduced from 298 K to 144 K. As a result of the research, a mixing flap design was developed to reduce the initial temperature amplitude of the flue gas streams from 298 K to 43 K. View Full-Text
Keywords: flue gas bypass; flue gas mixing; flue gas temperature before SCR; low-load power boiler operation; power plant flexibility flue gas bypass; flue gas mixing; flue gas temperature before SCR; low-load power boiler operation; power plant flexibility
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MDPI and ACS Style

Kurkus-Gruszecka, M.; Krawczyk, P.; Lewandowski, J. Numerical Analysis on the Flue Gas Temperature Maintenance System of a Solid Fuel-Fired Boiler Operating at Minimum Loads. Energies 2021, 14, 4420. https://doi.org/10.3390/en14154420

AMA Style

Kurkus-Gruszecka M, Krawczyk P, Lewandowski J. Numerical Analysis on the Flue Gas Temperature Maintenance System of a Solid Fuel-Fired Boiler Operating at Minimum Loads. Energies. 2021; 14(15):4420. https://doi.org/10.3390/en14154420

Chicago/Turabian Style

Kurkus-Gruszecka, Michalina, Piotr Krawczyk, and Janusz Lewandowski. 2021. "Numerical Analysis on the Flue Gas Temperature Maintenance System of a Solid Fuel-Fired Boiler Operating at Minimum Loads" Energies 14, no. 15: 4420. https://doi.org/10.3390/en14154420

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