Smoke inerting device applied to direct firing pulverizing system bituminite-fired boiler

The utility model relates to a smoke inerting device applied to a direct firing pulverizing system bituminite-fired boiler. Smoke of an outlet of an induced draft fan behind a dust remover is fed into an inlet of a primary fan for cooling primary air by a smoke inerting fan through a pipe, then the air is fed into a pulverizing system through an air pre-heater, and the drying capacity and safe explosion-proof requirement of the pulverizing system can be met simultaneously. By means of the fan, the low-temperature smoke is ingeniously fed into the pulverizing system, and accordingly the purpose of inerting the whole system is achieved.