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为了确立粗粒煤喷吹技术，用两种模型实验，调查了粒径为３５０～４５０Ｗ粒煤的高温分解、燃烧、气化和蓄积行为。一种是竖塔型反应炉，称作燃烧模型；另一种是高炉型反应炉，称作热模型。在燃烧模型实验中，粗粒煤在燃烧中分裂变为细粒。因此，粗粒煤的燃烧率比粒径为５０ｍｐ的煤粉低１０％。相对于焦炭而言，热模型下部的粗粒未燃炭优先气化，未燃炭在模型内蓄积和从顶部逸出均少。在室兰厂２号高炉实施了喷吹１５０ｋｇ八粗粒煤操作，没有产生透气性恶化及死料柱温度下降现象，而且未燃炭很少从炉顶逸出，操作稳定。
In order to establish the coarse coal injection technology, two kinds of model experiments were conducted to investigate the pyrolysis, combustion, gasification and accumulation behavior of coal with the particle size of 350 ~ 450W. One is a vertical tower reactor, called the combustion model; the other is a blast furnace reactor, called the thermal model. In a combustion model experiment, coarse coal breaks apart into fine particles during combustion. Therefore, the burning rate of coarse coal is 10% lower than that of pulverized coal with a particle size of 50 mpg. In contrast to coke, the coarse unburned carbon in the lower part of the thermal model preferentially gasifies, and the unburned carbon accumulates in the model and escapes less from the top. The No. 2 blast furnace in the Muroran Plant was sprayed with 150 kg of eight coarse coals without worsening the air permeability and reducing the temperature of the dead column, and the unburned carbon rarely escaped from the top of the furnace and was stable in operation.