Solid material comminution or disintegration – Apparatus – With automatic control
Patent
1982-11-12
1985-09-10
Rosenbaum, Mark
Solid material comminution or disintegration
Apparatus
With automatic control
241 30, 241 33, B02C 2500
Patent
active
045401292
ABSTRACT:
A pulverizer control system for controlling primary air flow and coal feeder speed to a coal pulverizer comprises a feeder controller for controlling the feeder speed, a feeder speed transmitter for sensing the feeder speed, a primary air flow controller for controlling the primary air flow to the pulverizer and a flow transmitter for sensing the primary air flow. A pulverized coal flow estimator is connected to the transmitters for calculating a coal flow rate which is compared in a first comparator with a demand signal for generating a first error signal. The first error signal is processed in a proportional plus integral unit to obtain a first pulverizer demand signal which is again compared in a second comparator with the calculated coal flow rate to obtain a second demand signal. The second demand signal is utilized to control the feeder controller. An additional comparator is connected to the flow transmitter and the second proportional plus integral unit to establish an air flow demand signal which is utilized to control the air flow controller. An energy correction unit is connected at the output of the estimator to convert the calculated coal flow rate to an energy flow rate which is compatible with the demand signal.
REFERENCES:
patent: 3856214 (1974-12-01), Kaltenbach et al.
patent: 3856217 (1974-12-01), Brewer
Edwards Robert J.
Gorski Joseph M.
Matas Vytas R.
Rosenbaum Mark
The Babcock & Wilcox Company
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