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由于石油和天然气供应紧张,煤已成为高炉喷吹的主要燃料,喷吹煤粉的高炉越来越多,每吨生铁的喷燃量也逐渐增加。为了更好地节约能源,对喷吹每1公斤煤粉所能置换的焦炭,即置换比,必须给以充分的重视。前几年,国内外高炉主要喷油。由于重油几乎不含灰分,普遍采用焦比和喷油量直接相加来计算燃料比。而喷煤时,因煤的灰分比油高得多,因此采用上述方法显然是不合理的。对此,有关部门曾规定煤的置换比一律按0.8计算。由于各种煤的灰分高低差
Due to tight supply of oil and natural gas, coal has become the main fuel injected into the blast furnace. As blast furnace pulverized coal blowing more and more, the amount of pig iron burnt per ton of steel is gradually increasing. In order to better save energy, it is necessary to give sufficient attention to the coke that can be replaced per kilogram of pulverized coal injected, that is, the replacement ratio. A few years ago, the main injection blast furnace at home and abroad. Since heavy oil contains almost no ash, it is common to calculate the fuel ratio by directly adding the coke ratio and fuel injection amount. The coal injection, due to coal ash is much higher than the oil, so using the above method is clearly unreasonable. In this regard, the relevant departments have stipulated that the replacement of coal should be calculated at 0.8. As a result of various ash ash level difference