High temperature electrochemical polishing of H{sub 2}S from coal gasification process stream. Quarterly progress report, January 1, 1995--March 31, 1995
An advanced process for the separation of hydrogen sulfide (H{sub 2}S) from coal gasification product streams through an electrochemical membrane is being developed. H{sub 2}S is removed from the syn-gas stream, split into hydrogen, which enriches the exiting syn-gas, and sulfur, which is condensed from an inert sweep gas stream. The process allows removal of H{sub 2}S without cooling the gas stream and with negligible pressure loss through the separator. The process is made economically attractive by the lack of need for a Claus process for sulfur recovery. To this extent the project presents a novel concept for improving utilization of coal for more efficient power generation. Past experiments using this concept dealt with identifying removal of 1--2% H{sub 2}S from gases containing only H{sub 2}S in N{sub 2}, simulated natural gas, and simulated coal gas. Data obtained from these experiments resulted in extended studies into electrode kinetics and electrode stability in molten melts. The most recent experiments evaluated the polishing application (removal Of H{sub 2}S below 10 ppm) using the Electrochemical Membrane Separator (EMS). H{sub 2}S removal efficiencies over 90% were achieved at these stringent conditions of low H{sub 2}S concentrations proving the technologies polishing capabilities. Other goals include optimization of cell materials capable of improving cell performance. Once cell materials are defined, cell experiments determining maximum removal capabilities and current efficiencies will be conducted. Also, a model theoretically describing the preferred reduction of H{sub 2}S, the transport of S{sup 2{minus}}, and the competing transport of CO{sub 2} will be investigated. The model should identify the maximum current efficiency for H{sub 2}S removal, depending on variables such as flow rate, temperature, current application, and the total cell potential.
- Research Organization:
- Georgia Inst. of Tech., Atlanta, GA (United States). School of Chemical Engineering
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG22-94PC94207
- OSTI ID:
- 105664
- Report Number(s):
- DOE/PC/94207-T3; ON: DE95016270
- Resource Relation:
- Other Information: PBD: [1995]
- Country of Publication:
- United States
- Language:
- English
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