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前言冶金、机械及电力等工业生产部门,在对料坯或产品的加热、热处理工序中,由于对产品产量和质量的高要求,为改善炉内温度的均匀性和提高热能的有效利用程度,常常通过某些方法使炉内气体之一部分进行再循环,以达到所期望的温度均匀性和操作的稳定性。常用的方法,通常为:①设置耐高温气体作用的烟泵或风扇,强制造成炉内气体的再循环;②与烧咀组合设计成气体的喷射装置,也就是利用由烧咀喷出的燃烧产物的能量来造成炉内气体的再循环。比较起来,后一方法,简单、经济、可靠性也强,故为人们所常用。从目前趋势来看,这种炉型
Preface Metallurgical, mechanical and electrical and other industrial sectors, in the raw billet or product heating, heat treatment process, due to the high product yield and quality requirements, in order to improve the uniformity of the furnace temperature and improve the effective utilization of thermal energy, Some of the furnace gases are often recycled by some means to achieve the desired temperature uniformity and operational stability. Commonly used methods, usually: ① set the role of high-temperature gas pump or fan, forced to cause the furnace gas recirculation; ② combined with the burning nozzle designed to gas injection device, which is the use of burner nozzle burning The energy of the product causes recirculation of the gas in the furnace. By comparison, the latter method is simple, economical and reliable, so it is commonly used by people. From the current trend, this type of furnace