论文部分内容阅读
利用火焰炉出炉烟气中的余热来预热空气,既可以增加空气入炉的物理热,又可以提高燃料的燃烧温度,改善燃烧条件,从而大幅度地降低燃料消耗。管状换热器的对流管束应选用什么材质,应根据换热器工作时管壁的最高温度来确定。由于目前不锈钢及耐热钢的价格较高,因此大多数企业在中小型炉子多采用普碳钢管来制作换热器。设计上又多采用传统型式(见图1),既空气走管内,烟气走管外。由于碳钢所允许的最高使用温变在450℃
Utilizing the residual heat from the flue gas from the flame furnace to preheat the air can not only increase the physical heat of the air into the furnace but also increase the combustion temperature of the fuel and improve the combustion conditions so as to greatly reduce the fuel consumption. Tubular heat exchanger convection tube bundle should be selected what material should be based on the heat exchanger tube wall to determine the maximum temperature. Due to the current high prices of stainless steel and heat-resisting steel, most enterprises use common carbon steel tubes to make heat exchangers in small and medium-sized furnaces. Design and use more traditional type (see Figure 1), both air tube, flue gas tube. Due to the maximum allowable carbon steel temperature change at 450 ℃