Control for a power plant coal mill pulverizer having feedforwar

Details Control for a power plant coal mill pulverizer having feedforwar Control for a power plant coal mill pulverizer having feedforwar

1978-02-16

1979-12-11

Spicer, Jr., Robert L.

Solid material comminution or disintegration

Apparatus

With automatic control

241 34, B02C 2500

Patent

active

041779509

ABSTRACT:
Power plant boiler fuel demand is transmitted as a coal feeder speed demand to a coal pulverizer control. A speed controller operates the feeder in accordance with the speed demand, and a position controller for a hot coal transport air damper positions the hot air damper to hold the mill outlet temperature to a setpoint value and to increase or decrease damper position in accordance with a feedforward signal representing the feeding speed demand. A position controller for a cold air damper regulates the total primary air flow to a value needed for safe and smooth transport of the pulverized coal to the boiler burners, and it accordingly acts as a process trim on the feedforward control applied by the hot damper controller.

REFERENCES:
patent: 2003985 (1935-06-01), Wallene
patent: 2060375 (1936-11-01), Ishimura
patent: 2152367 (1939-03-01), Smith
patent: 2226923 (1940-12-01), Cross
patent: 2419436 (1947-04-01), Boho
patent: 2894696 (1959-07-01), Miller

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