Four types of meager and meager-lean coal and one type of high-quality anthracite were selected based on the safety requirements for blast furnace coal injection and domestic coal quality to conduct microstructure and component analyses. The analyses of the organic and inorganic macerals and the chemical compositions of the selected coal samples indicate that the four types of meager and meager-lean coal have low volatilization, low ash content, and low sulfur content; these qualities are suitable for blast furnace injection. Grindability test was conducted on the four types of meager and meager-lean coal and the anthracite mixed coal samples. Results indicate that the mixture of meager and meager-lean coal and anthracite is beneficial to improve the grindability of pulverized coal. The explosive tests reveal that the selected coal samples are non-explosive or weakly explosive. When the proportion of meager and meager-lean coal is less than 40wt%, the mixed coal powder would not explode during the blowing process. The minimum ignition temperature test determines that the minimum ignition temperatures of the four types of meager and meager-lean coal and anthracite are 326, 313, 310, 315, and 393°C, respectively. This study provides a guiding research idea for the safety of meager and meager-lean coal used in blast furnace injection.

根据高炉喷煤的安全性要求和生活用煤的质量，选择了四种贫轻煤和一种优质无烟煤进行了组织和成分分析。对所选煤样品的有机和无机成分以及化学成分的分析表明，四种类型的贫煤和贫贫煤具有低挥发，低灰分和低硫含量的特点。这些品质适合高炉喷射。对四种类型的贫煤和贫贫煤以及无烟煤混合煤样品进行了可磨性测试。结果表明，贫煤和贫煤与无烟煤的混合物有利于提高煤粉的可磨性。爆炸测试表明所选的煤样品为非爆炸性或弱爆炸性。当贫煤和贫煤的比例小于40wt％时，混合煤粉在吹炼过程中不会爆炸。最低点火温度测试确定四种类型的贫煤和贫煤和无烟煤的最低点火温度分别为326、313、310、315和393°C。本研究为高炉喷吹中使用的贫煤和贫煤提供了指导性研究思路。最低点火温度测试确定四种类型的贫煤和贫煤和无烟煤的最低点火温度分别为326、313、310、315和393°C。本研究为高炉喷吹中使用的贫煤和贫煤提供了指导性研究思路。最低点火温度测试确定四种类型的贫煤和贫煤和无烟煤的最低点火温度分别为326、313、310、315和393°C。本研究为高炉喷吹中使用的贫煤和贫煤提供了指导性研究思路。