一、前言冶金行业是用能大户,一个中型轧钢厂的用能量一般超过4万吨标准煤,其中车间耗能量一般大于5000吨标准煤。而轧钢过程又属于高温操作,加热的钢坯温度一般达1050℃,炉内的烟气温度高达1250～1300℃,随着余热回收技术的发展,炉尾烟气都得到了较好的利用,但烟气温度仍有200～400℃,从 First, the foreword The metallurgical industry is able to use big energy, a medium-sized rolling mill with energy generally more than 40,000 tons of standard coal, of which the workshop energy consumption is generally greater than 5000 tons of standard coal. However, the rolling process belongs to the high temperature operation. The temperature of the heated billet is generally 1050 ° C. and the temperature of the flue gas in the furnace is as high as 1250~1300 ° C. With the development of waste heat recovery technology, the tail flue gas is well utilized, Flue gas temperature is still 200 ~ 400 ℃, from