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一、前言为了保证热风炉工作的可靠性,热风炉受热面的金属管壁温度必须低于金属材料的允许温度。因此对热风炉受热面管壁金属温度进行校核并予以限制,是热风炉设计中的一项重要工作。把排烟处烟气通过再循环风机,引入受热面入口,即排烟处烟气再循环,是限制壁温的有效方法。如何根据受热面金属的允许温度选定再循环系数,是该方法的关键问题。本文将介绍烟气在管内流动时受热面壁温的计算方法及再循环系数的确定方法。二、受热面壁温的计算图1所示为一烟气在管内流动,空气在管
I. Preface In order to ensure the reliability of the stove, the temperature of the metal wall of the heating surface of the hot blast stove must be lower than the allowable temperature of the metal material. Therefore, it is an important work in the design of hot blast stove to check and limit the metal temperature of the hot surface of the hot stove. The exhaust flue gas through the recirculation fan, the introduction of heating surface entrance, that is, flue gas at the exhaust gas recirculation is an effective way to limit the wall temperature. How to select the recirculation coefficient according to the allowable temperature of the heating surface metal is the key problem of this method. This article will introduce the method to calculate the wall temperature and the recirculation coefficient when the flue gas flows in the pipe. Second, the heat wall temperature calculation Figure 1 shows a flue gas flow in the tube, the air in the tube