Furnaces – Process – Burning pulverized fuel
Patent
1985-08-22
1986-05-20
Favors, Edward G.
Furnaces
Process
Burning pulverized fuel
110222, 110232, 110346, F23D 100
Patent
active
045893560
ABSTRACT:
The present invention relates to the recovery of heat values from biomass materials such as wood waste or peat. Wood waste or "hog fuel" from the forest industries is of particular interest. It has been discovered that this material can be burned with no fossil fuel support in an air suspension-type burner without the need to finely pulverize the full fuel stream. One portion of the biomass fuel stream is ground so that it is less than 100 .mu.m in diameter. This fine portion serves as an ignition component and should comprise about 20% of the total heating value of the fuel, using a conventional air suspension burner, or 10% of the total heating value using a staged burner, when the burners are operated at full load. The balance of the fuel can be of much larger particle size. This can be up to about 10 mm or even greater in maximum dimension if used with a grate equipped boiler. If the boiler lacks a grate, the principle fuel component should not exceed about 1 mm in thickness and 4 mm in any other dimension if carryover is to be avoided. A key aspect of the invention is the discovery that the total amount of ignition fuel component should be maintained constant regardless of burner load. The principal fuel component is modulated to accommodate load swings. Thus, at lower loads a higher percentage of the total heat energy is derived from the ignition fuel component.
REFERENCES:
patent: 3229651 (1966-01-01), Wasp
patent: 3831535 (1974-08-01), Baardson
patent: 4229183 (1980-10-01), Eneroth et al.
patent: 4235174 (1980-11-01), Spurrell
patent: 4249470 (1981-02-01), Vatsky
patent: 4333405 (1982-06-01), Michelfelder et al.
patent: 4423689 (1984-01-01), Merz et al.
patent: 4426938 (1984-01-01), Leikert et al.
patent: 4436038 (1984-03-01), Leikert et al.
patent: 4532873 (1985-08-01), Rivers et al.
Fagerlund, Bertil, "How Some Scandinavian Mills Get Higher Fuel Value From Bark", TAPPI, vol. 63, No. 3, pp. 35-36 (1980).
Schwieger, Bob, "Power From Wood", Power, 124 (2): S1-S 32 (1980).
Adams Terry N.
Golike Gregory P.
Karsner Grant G.
Lincoln James F. L.
Spurrell Robert M.
Favors Edward G.
Weyerhaeuser Company
LandOfFree
Energy recovery from biomass using fuel having a bimodal size di does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Energy recovery from biomass using fuel having a bimodal size di, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Energy recovery from biomass using fuel having a bimodal size di will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2103035