理论置换比(replacement ratio)是指按喷吹燃料中C，H元素含量，并分析其在高炉内参加还原过程应代替的焦炭量计算的理论。按高炉冶炼过程中实际取代的焦炭量计算的，称为实际置换比。喷吹各种燃料的置换比，与该种燃料中C、H元素含量及该燃料在风口高温区分解吸热量多少有关。另外与各厂所使用的焦炭质量，尤其是焦炭灰分有关。
煤中有机氢含量愈多，置换比愈高，同时也有利于煤粉的燃烧。
The more organic hydrogen content in coal, the higher replacement ratio, it can be profitable to combustion of coal at the same time.
实现了混合喷吹30％的烟煤，且取得了煤焦置换比提高0.1的效果。
The proportion of bituminous coal in mix reached:30% and the coal-to-coke replacement ratio was increased by 0.1.
根据料柱骨架理论和喷煤技术经济分析，提出了高炉喷煤极限和临界置换比的新概念；
According to the theory on stock column skeleton of BF and the economic analysis of injection, a new concept on limit of injected coal and critical replacement ratio is proposed.
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