Furnaces – With fuel treatment means – Preliminary refuse treatment means
Patent
1976-03-15
1976-12-14
Sprague, Kenneth W.
Furnaces
With fuel treatment means
Preliminary refuse treatment means
122 4D, F23D 1900
Patent
active
039968634
ABSTRACT:
A fluidized bed boiler is started up by directing into the static bed of inert and carbonaceous granules a downwardly angled burner so that the hot gases cause spouting. Air is introduced into the bed at a rate insufficient to fluidize the entire bed. Three regions are now formed in the bed, a region of lowest gas resistance, a fluidized region and a static region with a mobile region at the interface of the fluidized and static regions. Particles are transferred by the spouting action to form a conical heap with the carbonaceous granules concentrated at the top. The hot burner gases ignite the carbonaceous matter on the top of the bed which becomes distributed in the bed by the spouting action and bed movement. Thereafter the rate of air introduction is increased to fluidize the entire bed, the spouter/burner is shut off, and the entire fluidized bed is ignited.
REFERENCES:
patent: 2976853 (1961-03-01), Hunter et al.
patent: 3565022 (1971-02-01), Bishop
patent: 3881857 (1975-05-01), Hoy et al.
Carlson Dean E.
Sprague Kenneth W.
The United States of America as represented by the United States
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