Combustion or part-combustion in fluidized beds

Details Combustion or part-combustion in fluidized beds Combustion or part-combustion in fluidized beds

1976-02-12

1978-04-25

Sprague, Kenneth W.

Liquid heaters and vaporizers

Miscellaneous

110263, 201 31, 110347, F22B 102, F23D 1900

Patent

active

040857077

ABSTRACT:
In the partial or full combustion of fuels in a fluidized bed, the provision of heat transfer surfaces within the bed impedes particle circulation resulting in localized regions of relative intense chemical reaction which can damage the heat transfer surfaces and cause detrimental physical and/or chemical changes in the bed particles. This problem is exacerbated when the bed is relatively deep and narrow and when the part of full combustion is effected under pressure. In the invention, at least one conduit connects an upper region of the bed to a lower region of the bed, and expedients are provided to cause a downward particle flow through the conduit(s) thereby promoting an upward flow in the bed. Heat exchange surfaces may be in the bed and/or in the conduit(s).

REFERENCES:
patent: 2445327 (1948-07-01), Keith
patent: 2582711 (1952-01-01), Nelson
patent: 2582712 (1952-01-01), Howard
patent: 2818049 (1957-12-01), Blaskowski
patent: 2871004 (1959-01-01), Gorin
patent: 3171369 (1965-03-01), Stephens, Jr. et al.
patent: 3384557 (1968-05-01), Saller
patent: 3807090 (1974-04-01), Moss
patent: 3905336 (1975-09-01), Gamble et al.

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