Process for gasifying solid carbonaceous fuel. [28 claims]
A process for continuously gasifying carbonaceous material using fluidizing medium and oxygen-containing gas, under controlled feed rates and certain delivery conditions, and under selective processing conditions to produce a product rich in carbon monoxide and hydrogen is provided. If desired, the product can be produced with increased amounts of methane. Gasification is conducted under pressure in a fluidized bed to produce a gaseous reaction product, and char solids are coproduced. Additional increments of oxygen-containing gas with steam is selectively introduced. The product is passed through a dilute-phase, maintained at certain temperatures, at a certain superficial velocity, and for a certain residence time. The presence of undesirable heavy hydrocarbon by-products is precluded. Char, in removal from the bottom of the bed, is contacted with steam or inert gas to recover sensible heat. Cooled product gas is provided having less than about 4 grains of solid per scf at certain conditions. Partially spent char is removed from the product for discharge or certain purposes. The product is cooled and is conducted in a heat recovery zone to recover heat values at least a part of which are used to produce steam, a portion of which is utilized in the process. The cooled product gas is conducted through a high efficiency, high pressure-drop type, a scrubber to remove fine partially spentchar particles and provide a gas product containing minimal amounts of solids, a carbon monoxide content of at least about 10% (vol.), hydrogen, and a desired BTU content. The pressure in the gasifier is maintained by means of back-pressure control applied to the gas system at a point downstream of the gasifier. 28 claims, 4 figures.
- Assignee:
- Bamag Verfahrenstechnik GmbH
- Patent Number(s):
- US 4017272
- OSTI ID:
- 7106061
- Resource Relation:
- Patent File Date: Filed date 27 May 1976
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CARBON MONOXIDE
METHANATION
COAL GASIFICATION
FLUIDIZED BED
FUEL GAS
CALORIFIC VALUE
CHARS
EFFICIENCY
FLOWSHEETS
HEAT RECOVERY
HYDROGEN
PRODUCTION
SCRUBBERS
SCRUBBING
STEAM
CARBON COMPOUNDS
CARBON OXIDES
CHALCOGENIDES
CHEMICAL REACTIONS
COMBUSTION PROPERTIES
CRYOGENIC FLUIDS
DIAGRAMS
ELEMENTS
ENERGY RECOVERY
ENERGY SOURCES
EQUIPMENT
FLUIDS
FUELS
GAS FUELS
GASES
GASIFICATION
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
RECOVERY
THERMOCHEMICAL PROCESSES
010404* - Coal
Lignite
& Peat- Gasification