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Kinetics Of Mn Based Sorbents For Hot Coal Gas Quarterly Report September December 1996
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Book Synopsis Kinetics of MN Based Sorbents for Hot Coal Gas. Quarterly Report, September--December 1996 by :
Download or read book Kinetics of MN Based Sorbents for Hot Coal Gas. Quarterly Report, September--December 1996 written by and published by . This book was released on 1996 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manganese-based sorbents have been investigated for the removal of hydrogen sulfide (the primary sulfur bearing compound) from hot coal gases prior to its use in combined cycle turbines. Four formulations of Mn-based sorbents were tested in an ambient-pressure fixed-bed reactor to determine steady state H2S concentrations, breakthrough times and effectiveness of the sorbent when subjected to cyclic sulfidation and regeneration testing. In a previous report, the sulfidation results were presented. Manganese-based sorbents with molar ratios> 1:1 Mn:Substrate were effective in reducing the H2S concentration in simulated coal gases to less than 100 ppmv over five cycles. Actual breakthrough time for formulation C6-2-1100 was as high as 73% of breakthrough time based on wt% Mn in sorbent. In this report, the regeneration results will be presented. Regeneration tests determined that loaded pellets can be fully regenerated in air/steam mixture at 750°C with minimal sulfate formation. 16 refs., 9 figs., 5 tabs.
Book Synopsis Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Report, September 15 - December 15, 1996 by :
Download or read book Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Report, September 15 - December 15, 1996 written by and published by . This book was released on 1996 with total page 22 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manganese-based sorbents have been investigated for the removal of hydrogen sulfide (the primary sulfur bearing compound) from hot coal gases prior to its use in combined cycle turbines. Four formulations of Mn-based sorbents were tested in an ambient-pressure fixed-bed reactor to determine steady state H2S concentrations, breakthrough times and effectiveness of the sorbent when subjected to cyclic sulfidation and regeneration testing. In a previous report, the sulfidation results were presented. Manganese-based sorbents with molar ratios> 1:1 Mn:Substrate were effective in reducing the H2S concentration in simulated coal gases to less than 100 ppmv over five cycles. Actual breakthrough time for formulation C6-2-1100 was as high as 73% of breakthrough time based on wt% Mn in sorbent. In this report, the regeneration results will be presented. Regeneration tests determined that loaded pellets can be fully regenerated in air/steam mixture at 750°C with minimal sulfate formation. 16 refs., 9 figs., 5 tabs.
Book Synopsis Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Task 2 -- Exploratory Experimental Studies by :
Download or read book Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Task 2 -- Exploratory Experimental Studies written by and published by . This book was released on 1996 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, the Morgantown Energy Technology Center, is actively investigating alternative hot fuel gas desulfurization sorbents for application to the Integrated Gasification Combined Cycle (IGCC). A sorbent must be highly active towards sulfur at high temperatures and pressure's, and under varying degrees of reducing atmospheres. Thus, high conversion of the metal oxide and low hydrogen sulfide exit partial pressures. Also, it must regenerate nearly ideally to maintain activity over numerous cycles. Furthermore, regeneration must yield a sulfur product which is economically recoverable directly or indirectly. This cyclic process requires a holistic approach as any one criteria may eliminate a candidate sorbent from further consideration. Over fifty induration campaigns have been conducted among the fifteens Mn-based sorbent formulations. All indurated sorbents has been tested for crush strength and chemical analysis. Also, fifteen sorbent formulations have been tested in a TGA for at least on e induration condition. Subsequently described are the three main groups of formulations tested. They are the MnCO3 supported with TiO2 (with or without bentonite), MnCO3 supported with Al2O3 (with or without porosity enhancers), and MnO2 ore supported with alundum (with and without bentonite).
Book Synopsis Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Progress Report, September 15, 1995--December 15, 1995 by :
Download or read book Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Progress Report, September 15, 1995--December 15, 1995 written by and published by . This book was released on 1995 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Morgantown Energy Technology Center (METC) of the U.S. Department of Energy (DOE) is actively pursuing the development of reliable and cost-effective processes to clean coal gasifier gases for application to integrated gasification combined cycle (IGCC) and molten carbonate fuel cell (MCFC) power plants. A large portion of gas cleanup research has been directed towards hot gas desulfurization using Zn-based sorbents. However, zinc titanate sorbents undergo reduction to the metal at temperatures approaching 700°C and lose reactivity because of volatilization. In addition, sulfate formation during regeneration leads to spalling of reactive surfaces. Because of these problems with zinc-based sorbents, METC has shown interest in formulating and testing manganese-based sorbents. Currently, many proposed IGCC processes include a water quench prior to desulfurization. This quench is required for two reasons; limitations in the process hardware (1000°C), and excessive Zn-based sorbent loss (about 700°C). With manganese, the water quench is not necessary to avoid sorbent loss, since Mn-based sorbents have been shown to retain reactivity under cyclic testing at 900°C. This advantage of manganese over zinc has potential to increase thermal efficiency as the trade-off of increasing the equilibrium H2S over-pressure obtainable with a manganese sorbent. In the work which is reported here, lower loading temperatures (as low as 400°C) are studied. Also formulations containing titania rather then alumina are studied to attempt to improve performance.
Book Synopsis Kinetics of MN-based Sorbents for Hot Coal Gas Desulfurization. Semiannual Report, December 15, 1996--March 15, 1997 by :
Download or read book Kinetics of MN-based Sorbents for Hot Coal Gas Desulfurization. Semiannual Report, December 15, 1996--March 15, 1997 written by and published by . This book was released on 1997 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manganese-based sorbents have been investigated for the removal of hydrogen sulfide (the primary sulfur bearing compound) from hot coal gases prior to its use in combined cycle turbines. Four formulations of Mn-based sorbents were tested in an ambient-pressure fixed-bed reactor to determine steady state H2S concentrations, breakthrough times and effectiveness of the sorbent when subjected to cyclic sulfidation and regeneration testing. In previous reports, the sulfidation and regeneration results from cyclic testing done at 600°C were presented. Manganese-based sorbents with molar ratios>1:1 Mn:substrate were effective in reducing the H2S concentration in simulated coal gases to less than 100 ppmv over five cycles. Actual breakthrough time for formulation C6-2-1100 was as high as 73% of breakthrough time based on wt% Mn in sorbent. Regeneration tests determined that loaded pellets can be fully regenerated in air/steam mixture at 750°C with minimal sulfate formation. In this report, the results from the cyclic crush strength tests, sulfur profile test, and cyclic testing done after 5 cycles showed decreases in strength from 12.6% to 57.9%. Cyclic testing at 550°C showed pre-breakthrough concentrations as low as 10 ppmv. Cyclic testing done at 2 L/min and 3 L/min did not show any significant difference in pre-breakthrough concentrations or capacity.
Book Synopsis Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Report, December 15, 1993--March 15, 1997 by :
Download or read book Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Report, December 15, 1993--March 15, 1997 written by and published by . This book was released on 1997 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manganese-based sorbents have been investigated for the removal of hydrogen sulfide (the primary sulfur bearing compound) from hot coal gases prior to its use in combined cycle turbines. Four formulations of Mn-based sorbents were tested in an ambient-pressure fixed-bed reactor to determine steady state H2S concentrations, breakthrough times and effectiveness of the sorbent when subjected to cyclic sulfidation and regeneration testing. In previous reports, the sulfidation and regeneration results from cyclic testing done at 600°C were presented. Manganese-based sorbents, with molar ratios> 1:1 Mn:Substrate were effective in reducing the H2S concentration in simulated coal gases to less than 100 ppmv over five cycles. Actual breakthrough time for formulation C6-2-1100 was as high as 73% of breakthrough time based on wt% Mn in sorbent. Regeneration tests determined that loaded pellets can be fully regenerated in air/steam mixture at 750°C with minimal sulfate formation. In this report, the results from cyclic crush strength tests, Sulfur profile tests and cyclic testing at 550°C and lower flowrate cyclic testing are presented. Crush strength testing done after 5 cycles showed decreases in strength from 12.6% to 57.9%. Cyclic testing at 550°C showed pre breakthrough concentrations as low as 10 ppmv. Cyclic testing done at 2 L/min and 3 L/min did not show any significant difference in pre breakthrough concentrations or capacity.
Book Synopsis Bemerkungen über den prüfenden Blick eines Vaterland liebenden Bürgers, etc by :
Download or read book Bemerkungen über den prüfenden Blick eines Vaterland liebenden Bürgers, etc written by and published by . This book was released on 1801 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Demnach uns unterschriebenen Pfarrern, und Kirch-Dienern in der Stadt und Graffschafft Mömpelgardt, eine Ehescheidungs-Acte vom 6. October 1714 ... by :
Download or read book Demnach uns unterschriebenen Pfarrern, und Kirch-Dienern in der Stadt und Graffschafft Mömpelgardt, eine Ehescheidungs-Acte vom 6. October 1714 ... written by and published by . This book was released on 1720 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization by :
Download or read book Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization written by and published by . This book was released on 1995 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Progress Report, March 15, 1995--July 15, 1995 by :
Download or read book Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization. Quarterly Progress Report, March 15, 1995--July 15, 1995 written by and published by . This book was released on 1995 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot gas desulfurization may be accomplished by using solid sorbents such as oxides of those metals that form stable sulfides. The effectiveness of a desulfurizing agent in treating such gases is related to the predicted equilibrium partial pressure of hydrogen sulfide which will be present in a phase combination of the reduced form of sulfide and oxide phases. The focus of much current work being performed by the Department of Energy on sorbent development is in the use of zinc ferrite, zinc titanate, and Z-Sorb. The latter sorbent is a commercial product consisting of ZnO, a promoter, and a proprietary supporting matrix designed to provide stability and prolong sorbent life. Although these Zn-based sorbents have been the subject of extensive pilot-scale and process development work, all sorbents produced to date still experience structural and reactive degradation over multi-cycle use at relatively moderate temperatures. An effective alternative to zinc-based sorbents could be manganese sorbents which withstand high temperature operation and also maintain structural and reactive integrity over many cycles, as investigations by Ben-Slimane and Hepworth have indicated. Thermodynamic limits may prevent MnO from achieving the low sulfur specifications of the product gas for use in a molten carbonate fuel cell, but under the correct conditions the guideline for IGCC systems can easily be achieved. Furthermore, manganese sorbents could possibly be used in conjunction with a polishing sorbent (such as zinc oxide) possessing more favorable thermodynamic properties to reach levels acceptable for fuel cell applications (
Book Synopsis Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization by :
Download or read book Kinetics of Mn-based Sorbents for Hot Coal Gas Desulfurization written by and published by . This book was released on 1996 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: Currently, the Morgantown Energy Technology Center, Department of Energy (DOE/METC) is actively investigating alternative hot fuel gas desulfurization sorbents for application to the Integrated Gasification Combined Cycle (IGCC). A sorbent must be highly active towards sulfur at high temperatures and pressures, and under varying degrees of reducing atmospheres. Also, it must regenerate nearly ideally to maintain activity over numerous cycles. Furthermore, regeneration must yield a sulfur product which is economically recoverable directly or indirectly. Several metal oxides have been investigated as regenerable sorbents for the removal of hydrogen sulfide (the primary sulfur bearing compound) from hot fuel gases. MnO was shown to have an intrinsic reaction rate approximately one order of magnitude greater than the rate or reaction with either CaO or ZnO and two orders of magnitude greater than the reaction rate with V203. Manganese also shows desulfurization potential in the temperature range of 600-700°C where metal oxides currently known to be reactive with H2S are unsatisfactorily. In response to stability difficulties of single and binary metal oxide sorbents, increasing effort is being directed towards incorporation of an inert component into sorbent formulation as witnessed by the various Zn-titanates. Primarily, the inert component increases pore structure integrity while stabilizing the active metal oxide against reduction. This report will address testing of Mn-based sorbents in an ambient pressure fixed-bed reactor. Steady-state H2S concentrations and breakthrough times will be presented.
Book Synopsis Giglan. - (Titre :) L'Hystoire de Giglan filz de messire Gauvain qui fut roy de Galles et de Geoffroy de Maience son compaignon tous deux chevaliers de la table Ronde. Lesquelz feirent plusieurs et merveilleuses entreprinses... comme on pourra veoir en ce present livre, lequel a este nouvellement translate de langaige espaignol en nostre langaige francoys. - On les vend a Lyon en rue merchiere a l'enseigne de la Sphere cheu Gilles et Jaques Huguetan freres. - (A la fin :) Cy fine le livre de Giglan roy de Galles et de Geoffroy son compaignon, imprime nouvellement a Lyon, par Gilles et Jaques Huguetan frères le second jour de Juing, l'an de grace. Mil. VC.XXXIX. by :
Download or read book Giglan. - (Titre :) L'Hystoire de Giglan filz de messire Gauvain qui fut roy de Galles et de Geoffroy de Maience son compaignon tous deux chevaliers de la table Ronde. Lesquelz feirent plusieurs et merveilleuses entreprinses... comme on pourra veoir en ce present livre, lequel a este nouvellement translate de langaige espaignol en nostre langaige francoys. - On les vend a Lyon en rue merchiere a l'enseigne de la Sphere cheu Gilles et Jaques Huguetan freres. - (A la fin :) Cy fine le livre de Giglan roy de Galles et de Geoffroy son compaignon, imprime nouvellement a Lyon, par Gilles et Jaques Huguetan frères le second jour de Juing, l'an de grace. Mil. VC.XXXIX. written by and published by . This book was released on 1539 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government Reports Announcements & Index by :
Download or read book Government Reports Announcements & Index written by and published by . This book was released on 1996 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Kinetic Testing of in Situ Mined Manganese Based Fuel Gas Sorbents by : Rick William Stuart
Download or read book Kinetic Testing of in Situ Mined Manganese Based Fuel Gas Sorbents written by Rick William Stuart and published by . This book was released on 1995 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Energy Research Abstracts written by and published by . This book was released on 1995 with total page 758 pages. Available in PDF, EPUB and Kindle. Book excerpt: Semiannual, with semiannual and annual indexes. References to all scientific and technical literature coming from DOE, its laboratories, energy centers, and contractors. Includes all works deriving from DOE, other related government-sponsored information, and foreign nonnuclear information. Arranged under 39 categories, e.g., Biomedical sciences, basic studies; Biomedical sciences, applied studies; Health and safety; and Fusion energy. Entry gives bibliographical information and abstract. Corporate, author, subject, report number indexes.
Book Synopsis Investigation on Durability and Reactivity of Promising Metal Oxide Sorbents During Sulfidation and Regeneration. Quarterly Report, April 1--June 30, 1996 by :
Download or read book Investigation on Durability and Reactivity of Promising Metal Oxide Sorbents During Sulfidation and Regeneration. Quarterly Report, April 1--June 30, 1996 written by and published by . This book was released on 1996 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot-gas desulfurization for the integrated gasification combined cycle (IGCC) process has been investigated by many researchers to remove effectively hydrogen sulfide with various metal oxide sorbents at high pressures and high temperatures. Metal oxides such as zinc titanate oxides, zinc ferrite oxide, copper oxide, manganese oxide and calcium oxide, were found to be promising sorbents in comparison with other removal methods such as membrane separations and reactive membrane separations. Some metal oxide sorbents exhibited the quite favorable performance in terms of attrition resistance and sulfur capacity. Removal reaction of H2S from coal gas mixtures with promising sorbents of fine solid was carried on in a batch reactor. The objectives of this research project are to formulate promising durable metal oxide sorbents for the removal of sulfur compounds from coal gas mixtures, to find intrinsic initial reaction kinetics for a sorbent-hydrogen sulfide heterogeneous reaction system, to obtain effects of concentrations of coal gas components such as hydrogen and moisture on equilibrium absorption as well as dynamic absorption of hydrogen sulfide into formulated sorbents for the reaction system at various reaction temperatures and pressures, and to obtain effects of concentrations of coal gas components such as hydrogen and moisture on reaction rates of hydrogen sulfide with formulated sorbents at various reaction temperatures and pressures.
Book Synopsis Investigation on Durability and Reactivity of Promising Metal Oxide Sorbents During Sulfidation and Regeneration. Quarterly Report, July 1 - September 30, 1995 by :
Download or read book Investigation on Durability and Reactivity of Promising Metal Oxide Sorbents During Sulfidation and Regeneration. Quarterly Report, July 1 - September 30, 1995 written by and published by . This book was released on 1995 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: Hot-gas desulfurization for the integrated gasification combined cycle process has been investigated by many to remove effectively hydrogen sulfide with various metal oxide sorbents at high pressures and high temperatures. Metal oxides such as zinc titanate oxides, zinc ferrite oxide, copper oxide, manganese oxide and calcium oxide, were found to be promising sorbents in comparison with other removal methods such as membrane separations and reactive membrane separations. Some metal oxide sorbents exhibited the quite favorable performance in terms of attrition resistance and sulfur capacity. Removal reaction of H2S from coal gas mixtures with ZT-4 or other promising sorbents of fine solid particles, and regeneration reaction of sulfur-loaded sorbents will be carried on in a batch reactor or a continuous differential reactor. The objectives of this project are to find intrinsic initial reaction kinetics for the metal oxide-hydrogen sulfide heterogeneous reaction system, to obtain effects of concentrations of coal gas components such as hydrogen, carbon monoxide, carbon dioxide, nitrogen and moisture on equilibrium reaction rate constants of the reaction system at various reaction temperatures and pressures, to identify regeneration kinetics of sulfur-loaded metal oxide sorbents, and to formulate promising metal oxide sorbents for the removal of sulfur from coal gas mixtures. Promising durable metal oxide sorbents of high-sulfur- absorbing capacity will be formulated by mixing active metal oxide powders with inert metal oxide powders and calcining these powder mixtures, or impregnating active metal oxide sorbents on supporting metal oxide matrixes. The Research Triangle Institute will also prepare promising metal oxide sorbents for this research project, plan experiments on removal of sulfur compounds from coal gases with metal oxide sorbents as well as regeneration of sulfur-loaded metal oxide sorbents, and review experimental results. 1 ref., 10 figs., 11 tabs.
