High temperature hydrogen sulfide removal with tin oxide [electronic resource].

Published:: Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy.
Physical Description:: 15 pages : digital, PDF file
Additional Creators:: United States. Department of Energy and United States. Department of Energy. Office of Scientific and Technical Information

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Summary:

The system is based on the absorption of hydrogen sulfide (H₂S) 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 SO₂. TDA`s process carries out a modified Claus reaction to reduce the SO₂ from the second sorbent generation to elemental sulfur. In this case the sulfided stannic oxide forms stannous sulfide (SnS) which reduces the SO₂. The absorption by SnO₂ could remove over 90% of the H₂S from typical coal gas streams, but we use zinc ferrite (or zinc titanate), (a) to reduce H₂S to less than 20 ppM and (b) as a source of SO₂ in regeneration. Due to stoichiometry of regeneration we want to remove half of the H₂S by SnO₂ and the remainder by the second sorbent. The reactions with stannic oxide minimize the heat released during H₂S removal and regeneration. The absorption by SnO₂ is slightly endothermic and cools the gas stream by less that 5°F (2.8°C) during absorption. Regeneration with SO₂ 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 ≃400°F. The regeneration of SnO₂ increases the temperature by less than 50°F (28°C) in the same gas flow.

Report Numbers:

E 1.99:doe/er/80998--93/c0217
E 1.99: conf-9306148--28
conf-9306148--28
doe/er/80998--93/c0217

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Note:

Published through SciTech Connect.
09/01/1993.
"doe/er/80998--93/c0217"
" conf-9306148--28"
"DE93019956"
Coal-fired power systems `93: advances in IGCC and PFBC review meeting,Morgantown, WV (United States),28-30 Jun 1993.
Yu, J.; Copeland, R.J.; Karpuk, M.E.; Feinberg, D.; Windecker, B.; Wickham, D.
TDA Research, Inc., Wheat Ridge, CO (United States)

Funding Information:

FG03-90ER80998

View MARC record | catkey: 13840420