对流段 meaning in English
convection section
convection zone
Examples
- Convection above a hot surface occurs because hot air expands , becomes less dense , and rises ( see ideal gas law )
对流段的一个热门表面出现的，因为热空气的扩大，成为密度较低，而上升（见理想气体定律） 。 - 3 . on boiler retrofit , the calculation of fuel burning , the heat calculation of boiler inside structure and convection section , and the design of structure parameter of feed water heat exchanger are made . the flue gas channels " resistance calculation and the boiler strength verifying are also carried out . replacement of water cooling wall improves heat exchanging and decreases loss of heat radiant
对锅炉本体进行了燃料燃烧计算、炉膛结构热力计算、对流受热面结构热力计算、锅炉给水加热器结构参数设计、烟道阻力计算及锅炉元件强度校核等；改进了水冷壁布置使换热效果更好，减少辐射换热损失；改进对流段结构，更充分的利用炉膛出口烟气余热，提高热效率；并且进行了烟气阻力计算、热效率计算和能量平衡测试，对改进后的稠油燃料和改进前进行了对比，燃烧状况和热效率有明显改善。 - Abstract : the in servie tubular heaters built early in refineries and chemical plans 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 rhe convection section ; ( 2 ) increasign 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 capacityu ; ( 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
文摘: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，从而增加热源对炉壁的辐射传热量和炉管的传热量等。 - The in servie tubular heaters built early in refineries and chemical plans 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 rhe convection section ; ( 2 ) increasign 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 capacityu ; ( 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
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，从而增加热源对炉壁的辐射传热量和炉管的传热量等。