Gas: heating and illuminating – Generators – Cupola
Patent
1983-03-08
1984-06-12
Kratz, Peter F.
Gas: heating and illuminating
Generators
Cupola
48 66, 48 852, 48 87, 48DIG10, 364500, 422110, C10J 342
Patent
active
044539495
ABSTRACT:
An ash level control system is provided which incorporates an ash level meter to automatically control the ash bed level of a coal gasifier at a selected level. The ash level signal from the ash level meter is updated during each cycle that a bed stirrer travels up and down through the extent of the ash bed level. The ash level signal is derived from temperature measurements made by thermocouples carried by the stirrer as it passes through the ash bed and into the fire zone immediately above the ash bed. The level signal is compared with selected threshold level signal to determine if the ash level is above or below the selected level once each stirrer cycle. A first counter is either incremented or decremented accordingly. The registered count of the first counter is preset in a down counter once each cycle and the preset count is counted down at a selected clock rate. A grate drive is activated to rotate a grate assembly supporting the ash bed for a period equal to the count down period to maintain the selected ash bed level.
In order to avoid grate binding, the controller provides a short base operating duration time each stirrer cycle. If the ash bed level drops below a selected low level or exceeds a selected high level, means are provided to notify the operator.
REFERENCES:
patent: 4309194 (1982-01-01), Salvada et al.
Fasching George E.
Rotunda John R.
Breeden David E.
Esposito Michael F.
Hamel Stephen D.
Kratz Peter F.
The United States of America as represented by the United States
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