在加热炉的各项热损失中,所占比例最大的是烟气热损失,约占总热量的1/3～1/2。因此,尽量减少炉膛废气带走的热量并加强废热回收,是加热炉节能的关键。延长加热炉预热段,可以利用炉内烟气余热预热钢坯,提高热回收率,降低能耗。延长加热炉预热段同炉底强度、烟囱抽力、技术经济效果有密切联系,本文试就它们的关系作如下探讨。 In the furnace heat loss, the largest proportion of the heat loss of flue gas, accounting for about 1/3 ~ 1/2 of the total heat. Therefore, to minimize the heat removed from the furnace exhaust gas and to enhance waste heat recovery, heating furnace is the key to energy saving. Extend the heating furnace preheating section, you can use the flue gas waste heat preheating the billet to improve heat recovery and reduce energy consumption. Extending the heating furnace preheating section with the bottom strength, chimney pumping force, technical and economic effects are closely linked, this paper try to explore the relationship between them as follows.