High temperature hydrogen sulfide removal with tin oxide
The system is based on the absorption of hydrogen sulfide (H{sub 2}S) by stannic (tin) oxide. Two sorbents are required, the first sorbent is tin oxide and the second sorbent is a zinc oxide based material (i.e., zinc ferrite or zinc titanate) which is regenerated by air producing SO{sub 2}. TDA`s process carries out a modified Claus reaction to reduce the SO{sub 2} from the second sorbent generation to elemental sulfur. In this case the sulfided stannic oxide forms stannous sulfide (SnS) which reduces the SO{sub 2}. The absorption by SnO{sub 2} could remove over 90% of the H{sub 2}S from typical coal gas streams, but we use zinc ferrite (or zinc titanate), (a) to reduce H{sub 2}S to less than 20 ppM and (b) as a source of SO{sub 2} in regeneration. Due to stoichiometry of regeneration we want to remove half of the H{sub 2}S by SnO{sub 2} and the remainder by the second sorbent. The reactions with stannic oxide minimize the heat released during H{sub 2}S removal and regeneration. The absorption by SnO{sub 2} is slightly endothermic and cools the gas stream by less that 5{degrees}F (2.8{degrees}C) during absorption. Regeneration with SO{sub 2} is exothermic but releases only 11% of the heat that is liberated in regenerating the ZnO. For a nominal 6.5:1 steam to air the regeneration of ZnO increases the temperature by {approx_equal}400{degrees}F. The regeneration of SnO{sub 2} increases the temperature by less than 50{degrees}F (28{degrees}C) in the same gas flow.
- Research Organization:
- TDA Research, Inc., Wheat Ridge, CO (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG03-90ER80998
- OSTI ID:
- 10184689
- Report Number(s):
- DOE/ER/80998-93/C0217; CONF-9306148-28; ON: DE93019956
- Resource Relation:
- Conference: Coal-fired power systems `93: advances in IGCC and PFBC review meeting,Morgantown, WV (United States),28-30 Jun 1993; Other Information: PBD: [1993]
- Country of Publication:
- United States
- Language:
- English
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20 FOSSIL-FUELED POWER PLANTS
COAL GAS
DESULFURIZATION
HOT GAS CLEANUP
HYDROGEN SULFIDES
REMOVAL
ZINC OXIDES
SORPTIVE PROPERTIES
REGENERATION
SULFUR
PRODUCTION
COMBINED-CYCLE POWER PLANTS
COAL GASIFICATION
TIN OXIDES
ZINC COMPOUNDS
FERRITES
010402
010404
200102
PURIFICATION AND UPGRADING
GASIFICATION
POWER CYCLES