Low inlet gas velocity high throughput biomass gasifier
A method is described for operating a gasifier which comprises: introducing inlet gas at a velocity of about 0.5 to 7 ft/sec to fluidize a bed in a gasifier vessel; forming the bed into a fluidized bed in a first space region by means of the inlet gas, the fluidized bed containing a circulating hot relatively fine and inert solid bed particle component; inputting and throughputting carbonaceous material into and through the first space region with fluidized bed at a rate from 500-4400 lbs/ft/sup 2/-hr; endothermally pyrolyzing the carbonaceous material by means of the circulating hot inert particle component so as to form a product gas; forming contiguous to and above the fluidized bed a lower average density entrained space region containing an entrained mixture of inert solid particles, char, and carbonaceous material and the product gas; gradually and continuously removing the entrained mixture and the product gas from the lower average density entrained space region of the gasifier to a separator, residence time of the carbonaceous material in the gasifier not exceeding 3 minutes on average; separating the entrained mixture from the product gas; passing the entrained mixture containing inert solid particles, char, and carbonaceous material through an exothermic reaction zone to add heat; and returning at least the inert solid particles to the first space region.
- Assignee:
- Battelle Development Corp., Columbus, OH
- Patent Number(s):
- US 4828581
- OSTI ID:
- 5857589
- Country of Publication:
- United States
- Language:
- English
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BIOMASS
BIOMASS CONVERSION PLANTS
CHEMICAL REACTIONS
CHEMICAL REACTORS
DECOMPOSITION
ENERGY SOURCES
FUEL FEEDING SYSTEMS
FUEL SYSTEMS
GASIFICATION
OPERATION
PYROLYSIS
RENEWABLE ENERGY SOURCES
THERMOCHEMICAL PROCESSES