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Simultaneous Removal Of H2s And Nh3 In Coal Gasification Processes Quarterly Progress Report January 1 March 31 1995
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Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Progress Report, January 1--March 31, 1995 by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Progress Report, January 1--March 31, 1995 written by and published by . This book was released on 1995 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to develop advanced high-temperature coal gas desulfurization mixed-metal oxide sorbents with stable ammonia decomposition materials at 550--800 C. The specific objectives of the project are to: (1) develop combined sorbent-catalyst materials which shall be capable of removing hydrogen sulfide to less than 20 ppmv and ammonia by at least 90%; (2) carry out comparative fixed-bed studies of absorption and regeneration with various formulations of sorbent-catalyst systems and select the most promising sorbent-catalyst type; and (3) conduct long-term (at least 30 cycles) durability and chemical reactivity in the fixed-bed with the superior sorbent-catalyst. The activities of the HART 39 and HART 40 sorbent-catalysts were tested at 700 C using simulated coal gas. Figures show the H2S removal ability, its ammonia decomposition activity, and the H2S breakthrough profiles as a function of time. The pre-breakthrough H2S level was below 100 ppm. Nearly complete sorbent conversion (100%) was observed at breakthrough. The HART 39 and HART 40 sorbent-catalysts showed moderate catalytic activity (39% average conversion for HART 39; 46% average conversion for HART 40) for ammonia decomposition.
Book Synopsis Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Progress Report, January 1-March 31, 1995 by :
Download or read book Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Progress Report, January 1-March 31, 1995 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Technical Progress Report, July 1, 1995--September 30, 1995 by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Technical Progress Report, July 1, 1995--September 30, 1995 written by and published by . This book was released on 1996 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this program is to develop advanced high-temperature coal gas desulfurization sorbents for the removal of hydrogen sulfides and ammonia. Progress is described.
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes, Progress Report, October 1, 1995-December 31, 1995 by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes, Progress Report, October 1, 1995-December 31, 1995 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Progress Report, April 1--June 30, 1995 by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Progress Report, April 1--June 30, 1995 written by and published by . This book was released on 1995 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to develop advanced high-temperature coal gas desulfurization mixed-metal oxide sorbents with stable ammonia decomposition materials at 550--800 C. The specific objectives of the project are to: (1) develop combined sorbent-catalyst materials which shall be capable of removing hydrogen sulfide to less than 20 ppmv and ammonia by at least 90%; (2) carry out comparative fixed-bed studies of absorption and regeneration with various formulations of sorbent-catalyst systems and select the most promising sorbent-catalyst type; and (3) conduct long-term (at least 30 cycles) durability and chemical reactivity in the fixed-bed with the superior sorbent-catalyst. The activities of the HART 42 and HART 41 sorbent-catalysts were tested using the simulated coal gas. Figures show the H2S removal ability, its ammonia decomposition activity, and the H2S breakthrough profiles as a function of time. The pre-breakthrough H2S level was below 100 ppm. Nearly complete sorbent conversion (100%) was observed at breakthrough. The HART 42 sorbent-catalysts showed moderate catalytic activity (50% average conversion) for ammonia decomposition. The average conversion decreased from 66 to 47% as the temperature was increased from 600 to 750 C for HART 41 sorbent-catalysts.
Book Synopsis Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Progress Report, April 1-June 30, 1995 by :
Download or read book Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Progress Report, April 1-June 30, 1995 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. [Quarterly Report], January 1, 1996--March 31, 1996 by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. [Quarterly Report], January 1, 1996--March 31, 1996 written by and published by . This book was released on 1996 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to develop advanced high-temperature coal gas desulfurization mixed-metal oxide sorbents with stable ammonia decomposition materials at 550-800° C (1022- 1472° F). The specific objectives of the project are to: (1) develop a combined sorbent-catalyst materials shall be capable of removing hydrogen sulfide to less than 20 ppmv and ammonia by at least 90 percent (objective completed); (2) carry out comparative fixed-bed studies of absorption and regeneration with various formulations of sorbent-catalyst systems and select most promising sorbent-catalyst type (also completed); (3) conduct long-term (at least 30 cycles) durability and chemical reactivity in the fixed-bed with the superior sorbent-catalyst. Since HART-49 sorbent-catalysts showed a very promising catalyst activity for ammonia decomposition it was decided to run the multicycle runs using HART-49 sorbent-catalysts. Initially, up to 180 min the sorbent catalyst showed a very high activity (
Download or read book La Réformation written by and published by . This book was released on 2005 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Technical Progress Report, July 1, 1995-September 30, 1995 by :
Download or read book Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Technical Progress Report, July 1, 1995-September 30, 1995 written by and published by . This book was released on 1996 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Process. Quarterly Progress Report, October 1-December 31, 1994 by :
Download or read book Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Process. Quarterly Progress Report, October 1-December 31, 1994 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book מלזומת רבי פ'רג'י שוואט written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. [Quarterly] Report, September 2, 1993--December 31, 1993 by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. [Quarterly] Report, September 2, 1993--December 31, 1993 written by and published by . This book was released on 1993 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen (N2) occurs in coal in the form of tightly bound organic ring compounds typically at levels of 1 to 2 wt % on a dry-ash-free basis. During, coal gasification, this fuelbound nitrogen is released principally as ammonia and nitrogen, with smaller levels of HCN. The formation of NH3 in a coal gasification processes is a function of the fuel gas composition and the gasifier operating conditions. During the use of coal gas to generate electricity in gas-fired turbines, fuel bound (N2) is converted to nitrogen oxides (NO(subscript x)), which are difficult to remove and are highly undesirable as atmospheric pollutants. Recent results indicate that while the efficiency of molten carbonate fuel cell (MCFC) anodes is not effected by exposure to NH3, NO(subscript x) is generated during combustion of the anode exhaust gas. Thus, NH3 must be removed from the coal gas before it is used in IGCC or MCFC applications. The product stream from a high temperature, oxygen-blown gasifier, such as Texaco, contains about 2000 ppmv of NH3, where higher concentrations (about 5000 ppmv) occur when the gasification is conducted at lower temperatures, such as in the Lurgi or GE air-blown gasifier. A range of 1500 to 3000 ppmv is considered for this study. Removal of H2S using zinc-based sorbents, particularly zinc titanate, to
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Report, 1996 by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Quarterly Report, 1996 written by and published by . This book was released on 1996 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this study is to develop advanced high- temperature coal gas desulfurization mixed-metal oxide sorbents with stable ammonia decomposition materials at 550-800°C (1022- 1472°F). The specific objectives of the project are to: (i) Develop a combined sorbent-catalyst materials which shall be capable of removing hydrogen sulfide to less than 20 ppmv and ammonia by at least 90 percent. (ii) Carry out comparative fixed-bed Studies of absorption and regeneration with various formulations of sorbent- catalyst systems and select most promising sorbent-catalyst type. (iii) Conduct long-term (at least 30 cycles) durability and chemical reactivity in the fixed-bed with the superior sorbent-catalyst. Under Task 3, cyclic testing, HART-51 sorbent-catalyst was tested and found to have excellent catalytic activity for ammonia decomposition up to 180 - 200 min. The decline in activity after this time interval was mainly due to the poisoning of the catalyst by H2S.
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Final Report by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes. Final Report written by and published by . This book was released on 1996 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt: Nitrogen (N2) occurs in coal in the form of tightly bound organic ring compounds, typically at levels of 1 to 2 wt.% on a dry-ash-free basis. During gasification, this fuel-bound nitrogen is released principally as ammonia. The formation of NH3 in coal gasification processes is a function of the coal N2 content and the gasifier operating conditions. During the use of coal gas to generate electricity in gas-fired turbines or molten carbonate fuel cells, fuel bound N2 is converted to nitrogen oxides (NO(subscript x)), which are difficult to remove and are highly undesirable as atmospheric pollutants. Thus it is desirable to remove NH3 from coal gas in addition to other major contaminants such as hydrogen sulfide (H2S) and particulates. The objective of this study was to develop a successful sorbent-catalyst combination of an NH3 decomposition catalyst with a zinc-based mixed-metal oxide H2S sorbent with stable NH3 decomposition and H2S removal efficiency under cyclic sulfidation-regeneration conditions in the temperature range of 500 to 700 C. Combining the NH3 and H2S removal steps is expected to reduce capital and operating costs in an integrated gasification combined cycle (IGCC) power plant.
Book Synopsis Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Report, July 1, 1994-September 30, 1994 by :
Download or read book Simultaneous Removal of H2S and NHsub 3 in Coal Gasification Processes. Quarterly Report, July 1, 1994-September 30, 1994 written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Simultaneous Removal of H2S and NH3 in Coal Gasification Processes by :
Download or read book Simultaneous Removal of H2S and NH3 in Coal Gasification Processes written by and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis High Temperature Electrochemical Polishing of H2S from Coal Gasification Process Stream. Quarterly Progress Report, January 1, 1995--March 31, 1995 by :
Download or read book High Temperature Electrochemical Polishing of H2S from Coal Gasification Process Stream. Quarterly Progress Report, January 1, 1995--March 31, 1995 written by and published by . This book was released on 1995 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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. 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% H2S from gases containing only H2S in N2, 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 H2S below 10 ppm) using the Electrochemical Membrane Separator (EMS). H2S removal efficiencies over 90% were achieved at these stringent conditions of low H2S 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 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.
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