B - Operations – Transporting – 02 – C
Patent
B - Operations, Transporting
02
C
241/19
B02C 25/00 (2006.01)
Patent
CA 1205441
PULVERIZED CONTROL SYSTEM ABSTRACT OF THE DISCLOSURE A pulverizer control system for controlling primary air flow and coal feeder speed to a coal pulverizor 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 pulver- izor and a flow transmitter for sensing the primary air flow. A pulverized coal flow estimator is connected to the trans- mitters 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 pulverizor 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.
440979
Babcock & Wilcox Company (the)
Ridout & Maybee Llp
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