High Temperature Electrochemical Separation of H2S from Coal Gasification Process Streams. Quarterly Progress Report, July 1, 1993--September 30, 1993 PDF Download
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Languages : en
Pages : 11
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Book Description
The cobalt cathode used in the EMS proved stable and efficient. Removal of H2S was deterred by the possibility of hydrogen cross-over from process gases creating alternate reactions unfavorable to the removal system. Application of back pressure from the anode side of the cell would be the simplest solution to H2 cross-over. Examination of water proof of the vapor in the anode exit gases would provide proof of the aforementioned reaction hypothesis. Cobalt aluminate formation should not prove problematic, since degradation of the Co Cathode did not occur as a result. Once equilibrium is reached electrolyte addition is not necessary, therefore not a major concern.
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Category :
Languages : en
Pages : 11
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Book Description
The cobalt cathode used in the EMS proved stable and efficient. Removal of H2S was deterred by the possibility of hydrogen cross-over from process gases creating alternate reactions unfavorable to the removal system. Application of back pressure from the anode side of the cell would be the simplest solution to H2 cross-over. Examination of water proof of the vapor in the anode exit gases would provide proof of the aforementioned reaction hypothesis. Cobalt aluminate formation should not prove problematic, since degradation of the Co Cathode did not occur as a result. Once equilibrium is reached electrolyte addition is not necessary, therefore not a major concern.
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Category :
Languages : en
Pages : 11
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Book Description
A method of polishing coal synthesis gas by an electrochemical operation is being perfected. The operation which takes advantage of an electrochemical potential gradient rather than conventional techniques, removes poisonous H2S from the coal gas stream leaving only H2 to enrich the exiting flue gases. Sulfur is the by-product which is carried away by an inert sweep gas and condensed downstream. The technology is attractive due to aesthetics as well as economics when compared to other alternatives. Current experiments are focusing on production of selective membranes made of zirconia and improving cell housing seals using Aluminum foil gaskets.
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Category :
Languages : en
Pages : 20
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Book Description
A method of polishing coal synthesis gas by an electrochemical membrane operation is being perfected. The operation takes advantage of an electrochemical potential gradient rather than conventional techniques, separating the H2S from the coal gas stream, leaving only H2 to enrich the exiting fuel gases. Sulfur is the by-product that is carried away by a separate inert sweep gas and condensed downstream. The technology is attractive due to simplicity as well as economics when compared to alternatives. An analytical model describing the preferred reduction of H2S, the transport of S2−, and the competing transport of CO32− through the removal cell has continued. The main objective is the relation between cell polarization and current efficiency. This has been realized. Experiments this quarter focused on removing 100 ppM inlet H2S, utilizing laboratory fabricated cobalt cathodes.
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Category :
Languages : en
Pages : 13
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Book Description
A method of polishing coal synthesis gas by an electrochemical operation is being perfected. The operation which takes advantage of an electrochemical potential gradient rather than conventional techniques, removes poisonous H2S from the coal gas stream leaving only H2 to enrich the exiting flue goses. Sulfur is the by-product which is carried away by an inert sweep gas and condensed downstream. The technology is attractive due to aesthetics as well as economics when compared to other alternatives. Experiments this quarter focused on production of cobalt electrodes cable of sustaining pore symmetry in the cell environs.
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Category :
Languages : en
Pages : 11
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Book Description
A method of polishing coal synthesis by electrochemical operation is being perfected. An electrochemical potential gradient is used to remove H2S from the coal gas stream, leaving only H2 to enrich the exiting polished gases. Sulfur byproduct is swept away by an inert sweep gas and later condensed. Current experiments are based on improving selective removal from low initial H2S contents (10 ppm). High flow rate data is also being investigated along with sealing the cell housings. Latest option for consistent removal and seals is Zircar manufactured membranes.
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Category : Power resources
Languages : en
Pages : 782
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Category :
Languages : en
Pages : 34
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An advanced process for the separation of hydrogen sulfide from coal gasification product streams through an electrochemical membrane is being developed using the funds from this grant. H2S is removed from the syn-gas stream, split into hydrogen, which enriches the syn-gas, and sulfur, which can be condensed from an inert gas sweep stream. The process allows removal of H2S without cooling the gas stream and with negligible pressure loss through the separator. The process is economically attractive by the lack of adsorbents and the lack of a Claus process for sulfur recovery. Research conducted during the present quarter is here highlighted, with an emphasis on progress towards the goal of an economically viable H2S removal technology for use in coal gasification facilities providing polished fuel for co-generation coal fired electrical power facilities and Molten Carbonate Fuel Cell electrical power facilities.
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Languages : en
Pages : 8
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Book Description
Experimentation with a rigidized, electrolyte filled tile, left much to be desired. The instability of the tiles at molten conditions (> 550°C), provided the necessary mechanism for H2 to penetrate the membrane. Once H2 cross-over occurs the entire objective of electrochemical separation becomes nullified. The Zircar membranes used last quarter provided excellent protection against H2, prompting a reversion back to them. If porosities are strictly adhered to and the water-gas shift is properly handled, the membranes should provide an adequate mechanism for selective H2S removal.
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Category :
Languages : en
Pages : 8
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Book Description
An electrochemical membrane separation system for removing H2S from coal gasification product steams is the subject of this investigation. The high operating temperature, flow-through design, and capability of selective H2S removal and direct production of elemental sulfur offered by this process provide several advantages over existing and developmental H2S removal technologies. Two experiments (Run {number_sign}17 & {number_sign}18) examining the removal capability of the EMS with cobalt cathode were performed this quarter. The focus dealt with H2S removal as well as impeding hydrogen cross-over from the process gas side (cathode) of the membrane to the sweep gas side (anode).
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Category :
Languages : en
Pages : 21
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Book Description
An advanced process for the separation of hydrogen sulfide from coal gasification product streams through an electrochemical membrane is being developed using the funds from this grant. H2S is removed from the syn-gas stream, split into hydrogen, which enriches the syn-gas, and sulfur, which can be condensed from an inert gas sweep stream. The process allows removal of H2S without cooling the gas stream and with neglible pressure loss through the separator. The process is economically attractive by the lack of adsorbents and the lack of a Claus process for sulfur recovery.
