Coal pulverizing system for direct-fired coal-fired unit and monitoring control method of coal pulverizing system

The invention discloses a coal pulverizing system for a direct-fired coal-fired unit and a monitoring control method of the coal pulverizing system. The system comprises a plurality of medium-speed coal mills, a combustion hearth, a pulverized coal feeder, a pulverized coal bunker, a fine powder separator and a pulverized coal mixer. The medium-speed coal mill is respectively connected with a combustor and a fine powder separator on the combustion hearth; an outlet of the fine powder separator is connected with an inlet of the pulverized coal bunker, and an outlet of the pulverized coal bunker is connected with a plurality of powder feeders; and after being connected with one pulverized coal mixer, each pulverized coal feeder is connected into a combustor of the combustion hearth. The technical problems that an existing coal pulverizing system is difficult to cope with boiler load changes, restrictive influences exist between devices, the system operation stability is poor, and the flexibility of the coal pul