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一、脱湿鼓风的意义随着高炉冶炼技术的发展,高炉鼓风按其湿度而言,经历了一个从自然湿度鼓风到加湿鼓风再到脱湿鼓风的过程.由于高炉的大型化和喷吹重油或煤粉技术的采用以及对节能的日益重视,1974年在日本开始出现了脱湿鼓风,并在几年之内得到了迅速的发展. 宝钢4000米~3级高炉每炼1吨生铁需要空气约1.4吨,占所需物料总和的40%左右,可见鼓风对高炉冶炼是举足轻重的.如果宝钢高炉采用自然湿度鼓风,则在年平均气象条件下随鼓风进入高炉的水分为6.1吨/时左右,在夏季最热月平均最高气象条件下随鼓风进入高炉的水分为15.4吨/时左右.显然,水分在高炉风口前将发生分解反应而吸热,使风口前燃烧温度下降,以至增加焦比.而且,大气的绝对含湿量无论是一年的四季,还是一天中的24小时均是变化的.大气湿度
First, the meaning of dehumidification blast furnace With the development of blast furnace smelting technology, blast furnace blast in terms of its humidity, has gone through a process from natural humidity to humidification blast to dehumidification blasting.Because the large-scale blast furnace The introduction of heavy oil or pulverized coal injection technology and the growing emphasis on energy conservation started to emerge in Japan in 1974 and achieved rapid development within a few years. Refining 1 ton of pig iron needs about 1.4 tons of air, accounting for about 40% of the total required materials, shows that the blast furnace smelting is pivotal .If the natural blast blast furnace Baosteel, the average annual meteorological conditions with the blast into the The water content of the blast furnace is about 6.1 t / h, and the moisture entering the blast furnace with the blast air is about 15.4 t / h under the hottest month average maximum weather conditions in summer. Apparently, moisture will decompose and absorb heat before the blast furnace tuyere. The combustion temperature in the tuyere is reduced to increase the coke ratio, and the absolute moisture content of the atmosphere varies from the four seasons of the year to the 24 hours of the day.