Technique and apparatus for solids circulation control in the so

Details Technique and apparatus for solids circulation control in the so Technique and apparatus for solids circulation control in the so

1981-08-03

1983-08-09

Favors, Edward G.

Liquid heaters and vaporizers

Miscellaneous

110245, 16510416, 431 7, 431170, F22B 102

Patent

active

043972675

ABSTRACT:
A method and apparatus for controlling steam production by controlling the flow rate of particulate solids from a fluidized bed combustion chamber through a vertical heat exchanger. The pressure drop across a section of the vertical heat exchanger is monitored and compared with a set point pressure drop. When the pressure drop being monitored falls below the set point pressure drop, a signal is provided to a particulate solids feed control means which then allows more particulate solids to be circulated through the vertical heat exchanger. The vertical heat exchanger receives heat from the particulate solids. The additional amount of particulate solids fed to the vertical heat exchanger are recirculated along with the previous amount of particulate solids through the heat exchanger into the fluidized bed combustion chamber. Because of the additional cooled particulate solids in the fluidized bed combustion chamber the temperature of the fluidized bed combustion chamber drops. The temperature of the fluidized bed combustion chamber is monitored by temperature sensor when the temperature in the fluidized bed combustion chamber drops, a signal is provided to the fuel feed control means which provides additional fuel to the fluidized bed to provide additional heat to make up for the additional cooling in the vertical heat exchanger of the additional particulate solids.

REFERENCES:
patent: 3921590 (1975-11-01), Mitchell et al.
patent: 4240377 (1980-12-01), Johnson
patent: 4335683 (1982-06-01), Criswell et al.
Foxboro Company, Book No. 1528, d/p Cell Transmitter, Sep. 1955, p. 1.
Foxboro Company, Book No. 1755, Consotrol Recorder Models 53, 54 with Set Point Transmitter, Apr. 1963, p. 1.
Fink, Carl E. and Vardaman, Marion H., CO.sub.2 Acceptor Process: Status of Development, pp. 229-235, Inf. Circ. 8650, U.S. Dept. of Interior, Bureau of Mines.
Center Line, Inc., "Air Cylinder Actuator".

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