Apparatus and method for combusting carbonaceous fuels employing

Details Apparatus and method for combusting carbonaceous fuels employing Apparatus and method for combusting carbonaceous fuels employing

1977-03-07

1978-08-01

Sprague, Kenneth W.

Liquid heaters and vaporizers

Miscellaneous

110263, 23288S, F22B 102, F23D 1900

Patent

active

041036468

ABSTRACT:
A fluid bed boiler and combustion method are provided having a first fast bed combustion zone followed by a second slow bed combustion zone. Coal, as a typical fuel, and limestone are fed to the first zone, where the coal undergoes combustion and sulfur is captured by the limestone. The solids which flow from the top of the first combustion zone are separated and introduced into a low velocity "slow" bubbling fluid bed in which arrays of heat exchange tubes are immersed. Additional heat transfer to water can be achieved by employing water walls for the first fast bed combustion zone.

REFERENCES:
patent: 2498088 (1950-02-01), Lewis et al.
patent: 2700592 (1955-01-01), Heath
patent: 3763830 (1973-10-01), Robinson et al.
patent: 3840353 (1974-10-01), Squires
patent: 3868993 (1975-03-01), Battcock
patent: 3884649 (1975-05-01), Matthews
patent: 3902462 (1975-09-01), Bryers
patent: 3910235 (1975-10-01), Highley
patent: 4026679 (1977-05-01), Collin

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