Desulfurization of fuel gases in fluidized bed gasification and hot fuel gas cleanup systems
A problem with the commercialization of fluidized bed gasification is that vast amounts of spent sorbent are generated if the sorbent is used on a once-through basis, especially if high sulfur coals are burned. The requirements of a sorbent for regenerative service in the FBG process are: (1) it must be capable of reducing the sulfur containing gas concentration of the FBG flue gas to within acceptable environmental standards; (2) it must not lose its reactivity on cyclic sulfidation and regeneration; (3) it must be capable of regeneration with elimination of substantially all of its sulfur content; (4) it must have good attrition resistance; and, (5) its cost must not be prohibitive. It has now been discovered that calcium silicate pellets, e.g., Portland cement type III pellets meet the criteria aforesaid. Calcium silicate removes COS and H/sub 2/S according to the reactions given to produce calcium sulfide silicate. The sulfur containing product can be regenerated using CO/sub 2/ as the regenerant. The sulfur dioxide can be conveniently reduced to sulfur with hydrogen or carbon for market or storage. The basic reactions in the process of this invention are the reactions with calcium silicate given in the patent. A convenient and inexpensive source of calcium silicate is Portland cement. Portland cement is a readily available, widely used construction meterial.
- DOE Contract Number:
- AC02-76CH00016
- Assignee:
- Dept. of Energy
- Application Number:
- ON: DE84011309
- OSTI ID:
- 5001235
- Resource Relation:
- Other Information: Portions are illegible in microfiche products
- Country of Publication:
- United States
- Language:
- English
Similar Records
Calcium silicate cements for desulfurization of combustion gases. Semiannual progress report, October 1, 1980-March 31, 1981
Calcium silicate cement sorbent for H/sub 2/S removal and improved gasification processes. Annual progress report, October 1, 1981-September 30, 1982
Related Subjects
CALCIUM SILICATES
SORPTIVE PROPERTIES
FUEL GAS
DESULFURIZATION
HOT GAS CLEANUP
CEMENTS
CHEMICAL REACTIONS
COAL GASIFICATION
FLUIDIZED BED
PATENTS
REGENERATION
ALKALINE EARTH METAL COMPOUNDS
BUILDING MATERIALS
CALCIUM COMPOUNDS
DOCUMENT TYPES
FLUIDS
FUELS
GAS FUELS
GASES
GASIFICATION
MATERIALS
OXYGEN COMPOUNDS
PURIFICATION
SILICATES
SILICON COMPOUNDS
SURFACE PROPERTIES
THERMOCHEMICAL PROCESSES
010402* - Coal
Lignite
& Peat- Purification & Upgrading