Method and apparatus for improved firing of biomass and other solid fuels for steam production and gasification
OwnerDaniel R. Higgins, Eugene Sullivaninventors
Life of this patent
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Abstract
A ground supported single drum power boiler is described combining a refractory lined and insulated V-Cell floor; refractory lined and insulated combustion chamber; integrated fuel chutes configured to pre-dry wet solid fuel; top mounted fuel bin; internal chamber walls; configurable combustion air systems; and a back pass with after-burner ports and cross flow superheaters. The boiler can be configured in pre-assembled modules to minimize the field construction time and cost. An alternative embodiment is adaptable as a gasifier.
Claims16
A floor of a solid fuel fired boiler comprising one or more troughs in which most of the fuel firing said boiler falls into said trough or troughs and burns therein, each of said trough or troughs including an outer supportine structure, an inner refractory layer, and an insulating layer between said outer supporting structure and said inner refractory lining, and wherein the bottoms of each of said trough or troughs are truncated resulting in approximately horizontal openings in the bottoms of each of said trough or troughs, and in which a chute means extends downwards from each of said openings and a perforated movable grate floor resides below each of said openings such that each of said movable grate floors may be opened periodically to discharge the contents of each of said trough or troughs.
A solid fuel fired boiler comprising:
- with one or more walls internal to the furnace section of the boiler, each of said walls being comprised of closely spaced steel tubes in mutually parallel relationship and aligned such that the axes of the tubes are vertical for the majority of their length, with said tubes comprising one or more water and/or steam circulation circuits within the boiler, and
- one or more fuel chutes integral with one or more exterior walls of said boiler in which fuel flowing through said chute or chutes is directly exposed to hot boiler gas or to thermal radiation from one or more surfaces of said fuel chutes which are heated by said hot boiler gas to effect partial drying of the fuel.
A solid fuel fired boiler, comprising:
- one or more walls internal to the furnace section of the boiler, each of said walls being comprised of closely spaced steel tubes in mutually parallel relationship and aligned such that the axes of the tubes are vertical for the majority of their length, with said tubes comprising one or more water and/or steam circulation circuits within the boiler;
- and
- a front pass and a back pass, and wherein said back pass comprises a superheater and combustion air ports configured to complete the combustion of volatile gasses and/or control the temperature of the steam exiting said superheater.
A solid fuel fired boiler, comprising:
- one or more walls internal to the furnace section of the boiler, each of said walls being comprised of closely spaced steel tubes in mutually parallel relationship and aligned such that the axes of the tubes are vertical for the majority of their length, with said tubes comprising one or more water and/or steam circulation circuits within the boiler, wherein oxygen is used to cause combustion of a portion of the fuel therein, and wherein the heat released by said combustion causes gasification of the remaining fuel;
- and
- one or more internal chamber walls constructed of tubes and configured to rapidly cool said gasified fuel.
Dependencies are inferred from the claim text.