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• W1997955145 abstract "The tangentially fired furnaces have evolved because of rapid contacting of the fuel and air flame impingement, and the increased particulate residence time due to vortex motion. Tangentially fired units have a good record in being able to meet emission regulation on NOx as a result of their flexibility and the ability to control the heat release rate. Yet, the flow inside the tangentially fired furnaces is known to have its own peculiar aerodynamics; it is quite complicated in such a way that it is not easy to reach a satisfactory model to describe it. The drawbacks with the traditional tangentially fired furnaces are burner velocities. Low velocities are not suitable for fuels having high volatile contents, as ignition occurs in or near the burner causing slugging and distortion problems. Very high velocities on the other hand are undesirable as fuel particles can centrifuge out of the main combustion zone as unburnt carbon. The test boiler used in this work has tangential over fire registers located in the side walls, which are directed to form an imaginary circle at the centre to aid the suspension burning. The vortex formed by these jets, is then induced by the under grate air in reaching the higher levels in the furnace. In the test furnace, the fuel is not coming along with the tangential over fire air, but enters the furnace through the bagasse spreaders and carried by the distributor air. The combustion of bagasse and the propagation of the flame within the furnace are influenced by the tangential over fire air and the under grate air. In the present work, the furnace is simulated and analyzed for the propagation of flame and the patterns at various heights of the furnace supported by the measurements.Les fours a alimentation tangentielle ont evolue a cause de la mise en contact rapide entre le combustible et la flamme d'air ainsi que du temps de sejour accru des particules en raison du deplacement en vortex. De tels fours sont reconnus pour leur capacite de regulation des emissions de NOx grâce a leur flexibilite et leur capacite a controler le taux de liberation de la chaleur. Pourtant, l'ecoulement dans les fours a alimentation tangentielle est connu pour presenter une aerodynamique particuliere et compliquee a decrire par un modele satisfaisant. Les inconvenients de ce type de four traditionnel resident dans les cinetiques des bruleurs. De faibles cinetiques ne conviennent pas aux combustibles ayant des teneurs elevees en volatils, etant donne que l'allumage survient dans le bruleur ou pres de celui-ci, entrainant des problemes d'engorgement et de distorsion. D'un autre cote, des cinetiques elevees ne sont pas souhaitables, vu que les particules de combustible peuvent se centrifuger a l'exterieur de la zone principale de combustion, comme le carbone non brule. La chaudiere d'essai utilisee dans ce travail possede des registres de suralimentation tangentielle, localises dans les parois laterales et diriges sous la forme d'un cercle imaginaire au centre afin d'aider le brulage des suspensions. Le vortex forme par ces jets est alors induit par l'air se trouvant sous la grille a l'approche des niveaux superieurs dans le four. Dans le four d'essai, le combustible n'arrive pas en meme temps que l'air de suralimentation tangentielle, mais entre dans le four par les epandeuses de bagasse et est transporte par l'air du distributeur. La combustion de la bagasse et la propagation de la flamme dans le four sont influencees par l'air de suralimentation tangentielle et l'air sous la grille. Dans le present travail, le four est simule et analyse en termes de propagation de la flamme et des differents schemas a des hauteurs de four variees, et en s'aidant de mesures." @default.
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• W1997955145 date "2008-01-01" @default.
• W1997955145 modified "2023-09-26" @default.
• W1997955145 title "Experimental and numerical investigation of vortex-induced flame propagation in a biomass furnace with tangential over fire registers" @default.
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• W1997955145 doi "https://doi.org/10.1002/cjce.20007" @default.
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