提高管式加热炉处理能力的技术改造措施

Technical reform of tubular heater.

针对早期建造的炼油厂和化工厂在役管式加热炉热负荷和热效率低的状况 ,提出了若干技术改造措施包括 ,增大对流管表面积以增大对流段的热负荷 ;增加辐射管的换热面积 ;修正烟囱高度 ;换用新型燃烧器 ,变自然通风为强制供风 ,以增大燃烧器的发热量 ,减小过剩空气系数 ,节省燃料 2 %～ 3% ;在对流段和烟囱之间增设空气预热器以提高空气入炉温度 ;采用高温辐射涂料增强辐射换热效果 。

The in service tubular heaters built early in refineries and chemical plants have low thermal load and low heat efficiency, therefore measures for technical reform are offered, including (1) enlarging the surface area of convection tubes to increase the thermal load of the convection section; (2) increasing the heat interchanging area of radiant tubes; (3 ) changing the height of the chimney; (4)using new burner with forced air supply to increase calorific capacity; (5)adding air preheater between the convection section and chimney to enhence the temperature of the air entering the furnace; (6) adopting high temperature radiant coating to improve the effect of radiant heat interchanging.