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煤焦置换比是衡量喷煤效果的重要指标,在一定冶炼条件下,置换比与喷煤量的关系遵循递减规律,如何优化高炉操作提高煤焦置换比是高炉炼铁的重要工作之一。为了明确置换比的可调控因素,首先通过对比分析实际置换比和理论置换比的计算方法,确定了高炉喷煤置换比与入炉焦炭成分、煤粉性能和煤粉在高炉内行为之间的数学关系。其次通过统计分析焦比和置换比随着煤比的变化关系,发现焦比随着煤比的变化存在一个拐点,拐点之后焦比降低程度减小,表明置换比开始显著降低。焦比拐点和置换比显著降低开始点是表征置换比稳定区的重要指标,延迟拐点位置是高炉炼铁节能降耗、降本增益必须关注的问题。影响喷煤置换比的主要因素包括3个方面:喷吹煤粉特性、高炉操作以及实际喷煤量。改善置换比的主要措施包括3个方面:提高燃料的燃烧性、保持合理的炉料分布以及改善原燃料质量。
Coal-to-coal conversion ratio is an important index to measure the effect of coal injection. Under certain smelting conditions, the relationship between replacement ratio and coal injection volume follows a decreasing rule. How to optimize blast furnace operation and improve coal-to-coal conversion ratio is one of the important tasks in blast furnace ironmaking. In order to clarify the adjustable factors of the replacement ratio, firstly, by comparing and calculating the actual replacement ratio and theoretical replacement ratio, the relationship between replacement ratio of pulverized coal injection and coke composition, pulverized coal performance and pulverized coal in blast furnace were determined Mathematical relations. Secondly, through the statistical analysis of the relationship between coke ratio and displacement ratio with the coal ratio, it is found that the coke ratio has an inflection point with the change of coal ratio, and the decrease of coke ratio after the inflection point decreases, indicating that the replacement ratio is significantly reduced. Coke inflection point and replacement ratio significantly reduce the starting point is an important index to characterize the replacement ratio of the stability zone, the location of the delay inflection point blast furnace iron is energy saving, cost reduction gain must be concerned about. The main factors affecting the replacement ratio of coal injection include three aspects: the characteristics of pulverized coal injection, blast furnace operation and actual coal injection. The main measures to improve the replacement ratio include three aspects: to improve the combustibility of fuel, to maintain a reasonable distribution of charge and improve the quality of the original fuel.