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在大型四角切向燃烧锅炉中,直流燃烧器切圆燃烧方式,由于着火条件好,煤种适应性强,燃烧可调,后期燃烧气流扰动较强,有利于燃尽等优点而得到广泛的应用。直流燃烧器一般布置在炉膛四角上。煤粉气流在射出喷口时,虽然是直流射流,但当四股气流到达炉膛中心部位时,以切圆形式汇合,形成旋转燃烧火焰,同时在炉膛内形成一个自下而上的旋涡状气流。但是从燃烧器喷口喷出来的气流并不总能保持沿其几何轴线方向前进,总会出现它程度的偏斜,当气流偏斜严重时,可能导致燃烧器射流贴附式冲击炉墙,从而造成水冷壁结渣,影响锅炉的安全运行,笔者针对四角切向燃烧器锅炉燃烧器射流的开启角度及喷口数对燃烧器区空气动力场的影响分析,从而为改善炉内工况提供数据依据。
In the large square tangential combustion boiler, the tangential combustion of DC burners has been widely used due to good fire conditions, adaptability of coal, adjustable combustion, strong perturbation of combustion air flow in the later period, . DC burners are generally arranged on the four corners of the furnace. Pulverized coal airstream, although the jet is a jet, but when the four air flow reaches the center of the furnace when the merged in the form of a tangent to form a rotating combustion flame, while forming a bottom-up spiral flow in the furnace. However, the jet of air from the combustor nozzle does not always maintain its geometric axis and there is always some degree of deflection. When the air flow is heavily deflected, the jet of the burner may impact the furnace wall and thus Causing the slagging of the water wall and affecting the safe operation of the boiler. Based on the analysis of the opening angle of the jet burner of the tangential burner in the square corner and the influence of the number of nozzles on the aerodynamic field of the burner zone, the data are provided to improve the working conditions in the furnace .