High Temperature Electrochemical Polishing of H2S from Coal Gasification Process Streams. Quarterly Report, October 1--December 31, 1997 PDF Download
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Languages : en
Pages : 33
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Book Description
An advanced process for the separation of hydrogen sulfide from coal gasification streams through an electrochemical membrane is being perfected. H2S is removed from a synthetic gas stream, split into hydrogen, which enriches the existing syn-gas, and sulfur, which is condensed downstream from an inert sweep gas stream. The process allows for continuous removal of H2S without cooling the gas stream while allowing negligible pressure loss through the separator. Moreover, the process is economically attractive due to the elimination of the 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. This quarter's research focused on fabricating LiCoO2 electrodes and then utilizing them in full cell experiments at 650 C. The cathode showed inefficient porosity to allow mass transfer of the extremely dilute hydrogen sulfide to the electrolyte interface.
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Languages : en
Pages : 33
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Book Description
An advanced process for the separation of hydrogen sulfide from coal gasification streams through an electrochemical membrane is being perfected. H2S is removed from a synthetic gas stream, split into hydrogen, which enriches the existing syn-gas, and sulfur, which is condensed downstream from an inert sweep gas stream. The process allows for continuous removal of H2S without cooling the gas stream while allowing negligible pressure loss through the separator. Moreover, the process is economically attractive due to the elimination of the 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. This quarter's research focused on fabricating LiCoO2 electrodes and then utilizing them in full cell experiments at 650 C. The cathode showed inefficient porosity to allow mass transfer of the extremely dilute hydrogen sulfide to the electrolyte interface.
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Languages : en
Pages :
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Book Description
Author:
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Category :
Languages : en
Pages : 35
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Book Description
An advanced process for the separation of hydrogen sulfide (H2S) from coal gasification product streams through an electrochemical membrane is being developed. H2S 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 H2S 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. Membrane manufacturing coupled with full-cell experimentation was the primary focus this quarter. A tape-casted zirconia membrane was developed and utilized in one full-cell experiment (run 25); run 24 utilized a fabricated membrane purchased from Zircar Corporation. Results are discussed.
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Languages : en
Pages : 24
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Book Description
An advanced process for the separation of hydrogen sulfide H2S from coal gasification product streams through an electrochemical membrane is developed using funds from this grant. H2S is removed from the syngas stream, split into hydrogen, which enriches the exiting syngas, and sulfur, which is condensed from an inert sweep gas stream. The process allows removal of H2S without cooling the gas stream and with negligible pressure loss through the separator. The process is made economically attractive by the lack of need of 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. This quarter focused on replacing the MACOR cell housings with stainless steel, which is more industrially suitable. Three runs were attempted this quarter, with successful results achieved in Run 34. The purpose of these experiments was: (1) test the electrochemical membrane separator's ability to concentrate CO2, (2) test the electrochemical membrane separator's ability to remove H2S; and (3) test stainless steel as an alternative cell housing to MACOR as well as test nickel cathode performance at the reduced temperature.
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Languages : en
Pages : 22
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Book Description
An advanced process for the separation of hydrogen sulfide from coal gasification product streams through electrochemical membrane is being developed. H2S is removed from the syngas stream, split into hydrogen, with the existing syngas, and sulfur. Past experiments dealt with removal of 1-2% H2S from gases containing only H2S, nitrogen, and simulated coal gas. The most recent experiments evaluated the polishing application using Electrochemical Membrane Separator. Removal efficiencies of over 90% were achieved.
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Languages : en
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Languages : en
Pages : 31
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Book Description
Coal may be used to generate electrical energy by any of several processes, most of which involve combustion or gasification. Combustion in a coal-fired boiler and power generation using a steam- cycle is the conventional conversion method; however, total energy conversion efficiencies for this type of process are only slightly over 30%. Integration of a gas-cycle in the process (combined cycle) may increase the total conversion efficiency to 40%. Conversion processes based on gasification offer efficiencies above 50%. H2S is the predominant gaseous contaminant in raw coal gas. Problems arise due to the corrosive nature of H2S on metal components contained in these cycles. Because of this, H2S concentrations must be reduced to low levels corresponding to certain power applications. An advanced process for the separation of hydrogen sulfide (H2S) from coal gasification product streams through an electrochemical membrane is being developed using funds from this grant. Past experiments using this concept dealt with identifying removal of 1-2% H2S from gases containing only H2S in N2, simulated natural gas, and simulated coal gas. 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 H2S, the transport of S2−, and the competing transport of CO2 will be investigated. The model should identify the maximum current efficiency for H2S removal, depending on variables such as flow rate, temperature, current application, and the total cell potential. 21 refs., 10 figs., 9 tabs.
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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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Languages : en
Pages : 29
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Book Description
This program is concerned with the development of an advanced method for the separation of hydrogen sulfides from coal gas. The process utilizes an electrochemical membrane which removes hydrogen sulfide without cooling the gas and with negligible pressure loss through the separator.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 31
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Book Description
Coal may be used to generate electrical energy by any of several processes, most of which involve combustion or gasification. Combustion in a coal-fired boiler and power generation using a steam-cycle is the conventional conversion method; however total energy conversion efficiencies for this type of process are only slightly over 30%. Integration of a gas-cycle in the process (combined cycle) may increase the total conversion efficiency to 40%. Conversion processes based on gasification offer efficiencies above 50%. H2S is the predominant gaseous contaminant in raw coal gas. This process is concerned with the removal of H2 from coal gas through an electrochemical membrane technology.
