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前言目前,在国内外电站锅炉上,四角布置切向燃烧方式的直流燃烧器得到了广泛的应用。喷入炉内的气流,在炉膛中心形成一个假想切圆。实际上,自燃烧器喷入炉内的气流,只有在单股气流射入的情况下,才会和假想切圆相切。一般情况下射流并不沿设计方向轨迹前进,而是在允许的范围内有一定偏转,超过一定范围,便可能影响锅炉机组的安全经济运行。因此,研究四角燃烧炉内气流的流动特性,特别是研究影响一次风射流的偏转因素,从而采取相应的有效措施是必要的。
Preface At present, on the boilers in domestic and foreign power plants, the direct current burners with tangential combustion at four corners are widely used. Into the furnace air flow, in the hearth to form an imaginary tangent. In fact, the air flow that is injected into the furnace from the burner is only tangent to the imaginary tangent, with the injection of a single stream of air. Under normal circumstances, the jet does not follow the trajectory of the design direction, but is deflected to a certain extent within the allowable range. If it exceeds a certain range, it may affect the safe and economical operation of the boiler unit. Therefore, it is necessary to study the flow characteristics of the airflow in the four-corner combustion furnace, especially to study the deflection factors affecting the primary air jet, so as to take corresponding effective measures.