Influence of the temperature fluctuations on the flame temperature and radiative heat exchange inside a pulverized coal-fired furnace
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Published:2023
Issue:6 Part A
Volume:27
Page:4539-4549
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ISSN:0354-9836
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Container-title:Thermal Science
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language:en
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Short-container-title:THERM SCI
Author:
Crnomarkovic Nenad1ORCID, Belosevic Srdjan1ORCID, Tomanovic Ivan1ORCID, Milicevic Aleksandar1ORCID, Stojanovic Andrijana1ORCID, Tucakovic Dragan2ORCID
Affiliation:
1. Department of Thermal Engineering and Energy, “VINČA” Institute of Nuclear Sciences, National Institute of thе Republic of Serbia, University of Belgrade, Belgrade, Serbia 2. Faculty of Mechanical Engineering, University of Belgrade, Belgrade, Serbia
Abstract
In this paper, influence of the temperature fluctuations, (as a version of turbulence-radiation interaction), on the flame temperature and radiative heat exchange inside the pulverized coal-fired furnace was investigated. The radiative heat exchange was solved by the Hottel zonal model. The influence of the temperature fluctuation was studied for three values of the extinction coefficient of the flame: 0.3 m?1, 1.0 m?1, and 2.0 m?1. The investigation was conducted for the relative temperature fluctuations obtained by solving the transport equation for the temperature variance, and for four constant values of the relative temperature fluctuations (0.0, 0.1, 0.15, and 0.2). The maximal values of the mean temperature fluctuations and relative temperature fluctuations were obtained in the region close to the burners. The decrease of the flame temperature of about 100 K was obtained in the hottest region, for every extinction coefficient. An increase in the mean wall flux was found to be on the order of several percents, compared to the case without the temperature fluctuations. When the temperature variance was calculated, the mean relative temperature fluctuations were approximately 15%, for every extinction coefficient. The mean wall fluxes increased and flame temperature at the furnace exit plane decreased with the increase in the relative temperature fluctuations. The selected indicators of the furnace operation, such as the mean wall flux and mean flame temperature at the furnace exit plane, obtained for the calculated temperature variance, were close to the values predicted for the constant relative temperature fluctuation of 15%.
Funder
Ministry of Education, Science and Technological Development of the Republic of Serbia
Publisher
National Library of Serbia
Subject
Renewable Energy, Sustainability and the Environment
Reference27 articles.
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