COAL GRINDING MILL COAL-AND-AIR MIXTURE TEMPERATURE CONTROL SYSTEM Russian patent published in 2017 - IPC B02C25/00 F23N3/06 

FIELD: fuel.

SUBSTANCE: invention is intended for controlling over of explosive fuel drying process in coal grinding mills. Coal-and-air mixture temperature control system comprises coupled gates of flow rate of hot and lightly heated air and cold air gate. Hot and lightly heated air gates are connected to first actuating mechanism. To switching unit first input emergency cold air additive controller with second temperature sensor and setting device is connected. To switching unit second input first actuating mechanism "lower" path switch sensor is connected. First actuating mechanism input is connected to second switching unit output. Switching unit first input is connected to coal-and-air mixture temperature regulator output. Switching unit second input is connected to RS-trigger output. Trigger inputs are connected to “AND” element output and to second actuating mechanism "closed" limit switch sensor. “AND” element first and second inputs are connected to comparator unit and timer outputs. Comparison unit is connected to first temperature sensor and third setter. To timer «start» and «reset» inputs second actuating mechanism "closed" limit switch sensor is connected.

EFFECT: invention increases air gates control accuracy.

1 cl, 1 dwg, 1 tbl