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Etude de la combustion du charbon pulvérisé et de la biomasse sur un brûleur à swirl bas NOx

Abstract : This work concerns pulverised coal combustion and coal/biomass co-firing (wood pellets) for use in large power plants. The study presents results from classical instrumentation, new experimental devices and CFD computational fluid dynamics modeling on a 3 MWth boiler equipped with a swirl low-NOx burner. The work takes place in the framework of a Franco-British European project Interreg IIIA named COSAMM. Three new tools for industry are developed at the university of Kent, an instrument to measure particle speed in the feeding pipe before the burner. Just downstream on the feeding pipe, an optical particle size measurement by imaging is made, the last instrument used is measuring flame temperature and stability. In the flame, thermocouple and species measurements are made in complement. This measurement package coupled with modeling allows the validation of new the measurement instruments. The test on the semi-industrial boiler are used for anticipating problems for upgrading to the industrial stage. The thesis presents the used fuels nature, their combustion and the theoretical bases for the combustion modeling. Moreover, the experimental setup is described. The first test campaign allows testing the experimental instruments by the measures and the modeling. The second test campaign is done on burner parameters. The last campaign biomass is added with a mass fraction input going from 0 to 20%. There is a clear decrease in unburned carbon with the increasing biomass quantity. This combustion improvement with the biomass addition is offset by a strong slagging.
Keywords : coal combustion biomass
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  • HAL Id : tel-03009262, version 1

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Thomas Le Bris. Etude de la combustion du charbon pulvérisé et de la biomasse sur un brûleur à swirl bas NOx. Sciences de l'ingénieur [physics]. Université de Valenciennes et du Hainaut-Cambrésis, 2010. Français. ⟨NNT : 2010VALE0027⟩. ⟨tel-03009262⟩

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