Advanced sulfur control concepts for hot-gas desulfurization technology. Quarterly report, July--September 1994

Technical Report · Sat Oct 01 04:00:00 EDT 1994

OSTI ID:10119109

Harrison, D P

Primary effort during the past quarter was devoted to a thermodynamic analysis of the reduction/desulfurization and regeneration cycles of the high temperature coal gas desulfurization process. The regeneration cycle analysis concentrated upon the potential for the direct production of elemental sulfur and considered the three regeneration concepts previously identified partial oxidation in an O{sub 2}-starved environment, reaction with SO{sub 2}, and regeneration with steam. The latter concept produces H{sub 2}S instead of elemental sulfur, but is attractive because of existing technology to convert high concentrations of H{sub 2}S into sulfur. All thermodynamic analysis was based upon the principle of free energy minimization and used the computer program CHEMQ. Each candidate sorbent was evaluated over a temperature range of 600 to 1,150 K, and a pressure range of 1 to 25 atm for both the reduction/desulfurization and regeneration cycles. The thermodynamic analysis indicates that zinc oxide, in particular, has the potential for removing more than 99% of the H{sub 2}S from both the Texaco and KRW gases. Yet the possibility of forming sulfur, or even high concentrations of H{sub 2}S, during regeneration is quite small. Iron oxide, which is somewhat less effective for H{sub 2}S removal, is more amenable to elemental sulfur formation, particularly via the particle oxidation concept. The thermodynamic properties of both SnO{sub 2} and CeO{sub 2} are uniquely favorable for elemental sulfur production, but exhibit lower affinity for H{sub 2}S removal. A process involving either of the sorbents would require two-stage desulfurization to produce product gases having H{sub 2}S concentrations in the 20 ppmv range. Highlights and an overall summary are described in this quarterly report.

• Research Organization: Louisiana State Univ., Baton Rouge, LA (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC21-94MC30012
• OSTI ID: 10119109
• Report Number(s): DOE/MC/30012--3953; ON: DE95000044; BR: AA0510000
• Country of Publication: United States
• Language: English

Related Subjects

01 COAL, LIGNITE, AND PEAT
010402
ADSORBENTS
C CODES
CERIUM OXIDES
COAL GAS
COBALT OXIDES
COMPUTERIZED SIMULATION
COPPER OXIDES
DESULFURIZATION
EXPERIMENTAL DATA
HOT GAS CLEANUP
HYDROGEN SULFIDES
IRON OXIDES
KRW GASIFICATION PROCESS
MATERIALS RECOVERY
MOLYBDENUM OXIDES
PROGRESS REPORT
PURIFICATION AND UPGRADING
REGENERATION
SORPTIVE PROPERTIES
SULFUR
SULFUR DIOXIDE
TEXACO GASIFICATION PROCESS
THERMODYNAMICS
TIN OXIDES
TITANATES
ZINC COMPOUNDS
ZINC OXIDES