Gas: heating and illuminating – Processes – Fuel mixtures
Patent
1983-08-02
1986-06-03
Kratz, Peter
Gas: heating and illuminating
Processes
Fuel mixtures
48203, 48209, 252373, 518703, C10J 354
Patent
active
045927626
ABSTRACT:
A process for gasification of cellulosic biomass in a single gasification vessel wherein the cellulosic biomass is introduced directly into a single back-mixed fluidized bed of high heat capacity inert solids. The fluidized bed is maintained at temperatures of about 1200.degree. to about 1600.degree. F., pressures of up to about 500 psig devolatilizing the biomass. A substantial portion of the heavier hydrocarbons produced by devolatilization of the biomass is reformed within the gasification vessel and a substantial portion of the devolatilized biomass is gasified by reaction with hydrogen and steam within the fluidized bed. Biomass residue is combusted in an oxygen-rich atmosphere in the lower portion of the fluidized bed to principally form heat and biomass ash. The highly back-mixed fluidized bed results in temperature variation along the height of the bed, including the combustion zone, of less than 100.degree. F. Introduction of cellulosic biomass feed to the fluidized bed is vertically adjustable and maintained at a position where the combustion consumes principally biomass residue. Formed gases, vapor and biomass ash are removed from the top of the gasification vessel in the gas stream. The process provides high throughput, efficient production of low and medium Btu fuel gas. The medium Btu fuel gas may be readily upgraded to high Btu SNG. At least half of the methane required for SNG is produced in the gasification vessel.
REFERENCES:
patent: 2633416 (1953-03-01), Gornowski et al.
patent: 2772954 (1956-12-01), Jequier
patent: 3957459 (1976-05-01), Mitchell et al.
patent: 4157245 (1979-06-01), Mitchell et al.
Anderson Gerald L.
Babu Suresh P.
Nandi Satyendra P.
Institute of Gas Technology
Kratz Peter
Speckman Thomas W.
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