The results show that, double injection system can get high replacement ratio of coal liquids fuel and good operation performance of the engine.

试验表明，采用此方法，可获得较高的煤液化燃料的代用率，发动机工作性能良好。

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After injection coal, the distribution of gas flow and ratio of heat flows inside the blast furnace will change. Some measures should be taken to ensure the stability of the furnace.

高炉喷煤后，炉内的煤气流分布和热流比均发生变化，高炉必须采取与之相对应的调剂措施，才能维持高炉的稳定顺行；

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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.

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；

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