针对中间储仓式制粉系统在磨制高挥发分煤种时容易发生可燃气体爆炸的问题，以６７０ｔ／ｈ锅炉为例，对几种改变干燥介质成分防止爆燃的方案进行了比较，对最佳方案的设备改动要点及运行调节中应注意的问题进行了说明。 Aiming at the problem that the middle storage type pulverizing system is prone to combustible gas explosion when grinding high volatile coal, the scheme of 670t / h boiler is taken as an example to change the composition of the drying medium to prevent deflagration. The main points of equipment modification and the problems that should be paid attention to during operation adjustment are described.