Method for the desulfurization of hot product gases from coal gasifier
This patent describes a method for removing sulfur compounds from coal-derived gases produced from the gasification of coal containing sulfur in a gasifier having a gasification zone, a combustion zone and an ash zone, comprising the steps of introducing a mixture of particulate coal and a calcium compound into the gasifier, heating the coal particulates in the gasifier to a temperature adequate to form a coal-derived gaseous mixture containing sulfur compounds including hydrogen sulfide, conveying the gaseous mixture through a bed containing particulate absorbent from zinc ferrite, iron oxide, or combinations thereof for absorbing sulfur compounds including the hydrogen sulfide from the gaseous mixture, thereafter contact the particulate absorbent containing absorbed hydrogen sulfide with a stream of air or oxygen and steam for regenerating the absorbent by converting the hydrogen sulfide to sulfur dioxide, conveying a stream containing steam and the sulfur dioxide resulting from the regeneration of absorbent into the gasifier for contact and reaction with the calcium compound within the gasifier to form therewith a solid sulfur-calcium compound, and removing the sulfur-calcium compound from the gasifier.
- Assignee:
- Dept. of Energy, Washington, DC
- Patent Number(s):
- US 4769045
- OSTI ID:
- 6692569
- Country of Publication:
- United States
- Language:
- English
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54 ENVIRONMENTAL SCIENCES
ADSORBENTS
ADSORPTION
AIR POLLUTION CONTROL
ALKALINE EARTH METALS
CALCIUM
CHALCOGENIDES
CHEMICAL REACTIONS
COAL FINES
COAL GASIFICATION
COAL GASIFICATION PLANTS
CONTROL
DESULFURIZATION
ELEMENTS
EMISSION
FERRIMAGNETIC MATERIALS
FERRITES
GASEOUS WASTES
GASIFICATION
HYDROGEN COMPOUNDS
HYDROGEN SULFIDES
INDUSTRIAL PLANTS
IRON COMPOUNDS
IRON OXIDES
MAGNETIC MATERIALS
MATERIALS
METALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL
REGENERATION
REMOVAL
SORPTION
SULFIDES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENT COMPOUNDS
WASTES
ZINC COMPOUNDS