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Download or read book Long Life Moving-Bed Zinc Titanate Sorbent written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert J. Copeland
Publisher :
ISBN 13 :
Total Pages : 31 pages
Book Rating : 4.:/5 (113 download)
Download or read book Regenerating a Long-Life Zinc Oxide-Based Sorbent for Moving Bed Reactors written by Robert J. Copeland and published by . This book was released on 1998 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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Publisher :
ISBN 13 :
Total Pages : 12 pages
Book Rating : 4.:/5 (16 download)
Download or read book Testing of Zinc Titanate Desulfurization Sorbents for Moving-bed Applications written by and published by . This book was released on 1993 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt: Sorbents developed for moving-bed systems must comply with a minimum of chemical and mechanical durability performance characteristics in order to be considered acceptable for long-term operation. Among the desired properties, a sorbent must have: (1) High chemical reactivity, as measured by the rate of sulfur absorption and the total sulfur loading on the sorbent. (2) High mechanical strength, as measured by the pellet crush strength and the attrition resistance; (3) Suitable pellet morphology, as given by pellet size and shape to promote good bulk flow ability and seasonable porosity to increase reactivity. Formulation 2A1.7M (UCI designation L-3787M) was selected by DOE as the baseline formulation for performance evaluation of Option 3 sorbents. This baseline formulation is a rounded zinc titanate sorbent containing a 2:1 Zn:Ti molar ratio, 1.7% molybdenum (equivalent to 2.5% MoO3), and 3% bentonite binder that had been previously tested under the Option 2 program. Zinc titanate sorbents were prepared by UCI as rounded spherical or ellipsoidal pellets. The fabrication procedure is targeted at achieving a balance of mechanical strength (crush strength and attrition resistance) and chemical reactivity by controlling the pellet internal porosity.
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ISBN 13 :
Total Pages : 51 pages
Book Rating : 4.:/5 (685 download)
Download or read book Enhanced Durability of High-temperature Desulfurization Sorbents for Moving-bed Applications. Option 2 Program written by and published by . This book was released on 1993 with total page 51 pages. Available in PDF, EPUB and Kindle. Book excerpt: One of the most advantageous configurations of the integrated gasification combined cycle (IGCC) power system is coupling it with a hot gas cleanup for the more efficient production of electric power in an environmentally acceptable manner. In conventional gasification cleanup systems, closely heat exchangers are necessary to cool down the fuel gases for cleaning, sometimes as low as 200--300°F, and to reheat the gases prior to injection into the turbine. The result is significant losses in efficiency for the overall power cycle. High-temperature coal gas cleanup in the IGCC system can be operated near 1000°F or higher, i.e., at conditions compatible with the gasifier and turbine components, resulting is a more efficient overall system. GE is developing a moving-bed, high-temperature desulfurization system for IGCC power systems in which mixed-metal oxides are currently being used as desulfurization sorbents. The objective of this contract is to identify and test fabrication methods and sorbent chemical compositions that enhance the long-term chemical reactivity and mechanical durability of zinc ferrite and other novel sorbents for moving-bed, high-temperature desulfurization of coal-derived gases. Zinc ferrite was studied under the base program of this contract. In the next phase of this program novel sorbents, particularly zinc titanate-based sorbents, are being studied under the remaining optional programs. This topical report summarizes only the work performed under the Option 2 program. In the course of carrying out the program, more than 25 zinc titanate formulations have been prepared and characterized to identify formulations exhibiting enhanced properties over the baseline zinc titanate formulation selected by the US Department of Energy.
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ISBN 13 :
Total Pages : 20 pages
Book Rating : 4.:/5 (417 download)
Download or read book Spokane's Golden Jubilee written by and published by . This book was released on 1931 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 332 pages
Book Rating : 4.0/5 ( download)
Download or read book Energy Research Abstracts written by and published by . This book was released on 1994-03 with total page 332 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (684 download)
Download or read book Long Life ZnO-TiO2 and Novel Sorbents written by and published by . This book was released on 1996 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Combined cycles (combinations of a gas turbine and a steam bottoming cycle) are the most efficient power generation technology, while coal is the lowest cost fuel. Therefore, the combination of Coal Gasifiers and Combined Cycles is predicted to be the lowest cost source of baseload electric power in the next decade. In a GCC, the sulfur and particulates are removed from the gasifier gases before they enter the turbine combuster. While H2S (and COS/CS2) can be removed effectively by cooling hot gases down to near room temperature and scrubbing them with an aqueous amine solution, removing the H2S without cooling the gases (i.e., hot gas cleanup) is more advantageous. The leading hot gas sulfur absorbent uses a regenerable zinc oxide (ZnO) based sorbent, zinc titanate (Zn2TiO4 and/or ZnTiO3), to remove the H2S and other sulfur compounds from the hot coal gases. The zinc absorbs H2S, forming zinc sulfide (ZnS); ZnS is then regenerated with oxygen (air), releasing the sulfur as a concentrated stream of SO2. The SO2 can be converted into sulfuric acid, sulfur, or reacted with calcium carbonate to form calcium sulfate (gypsum). The sorbent may be operated in a fluidized bed reactor, transport reactor, or moving bed reactor. Both the fluidized-bed and the transport reactor use two separate reactors; one absorbs H2S COS and CS2 and converts the ZnO to ZnS; the second bed regenerates the sorbent with air converting the ZnS back to ZnO and producing SO2 (Figure 1); the sorbent moves between the two reactors to carry sulfur out of the absorber and return regenerated sorbent. Fluidized bed and transport reactors circulate very small particles at high gas velocity. The high gas-solid contact area of very small particles rapidly transfers both heat and mass within the reactor. The fluidized bed and transport reactor hot gas cleanup desulfurization systems are very similar and the sorbent particles are also of the same size (i.e., 50 to 400 micron). While there are several differences between the two reactors, the one which most affects the sorbent is the operation of the regenerator: fluidized bed reactors operate with diluted air while transport reactors operate with undiluted air.
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ISBN 13 :
Total Pages : 10 pages
Book Rating : 4.:/5 (16 download)
Download or read book Moving-bed Sorbents written by and published by . This book was released on 1995 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objective of this program is to develop mixed-metal oxide sorbent formulations that are suitable for moving-bed, high-temperature, desulfurization of coal gas. Work continues on zinc titanates formulations and Z-sorb III sorbent.
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ISBN 13 :
Total Pages : 15 pages
Book Rating : 4.:/5 (873 download)
Download or read book Enhanced Durability of High-temperature Desulfurization Sorbents for Fluidized-bed Applications. [Zinc Titanate]. written by and published by . This book was released on 1992 with total page 15 pages. Available in PDF, EPUB and Kindle. Book excerpt: The objectives of this project are to identify and demonstrate methods for enhancing long-term chemical reactivity and attrition resistance of zinc ferrite and zinc titanate sorbents to be employed for desulfurization of hot coal-derived gases in a high-temperature, high-pressure (HTHP) fluid-bed reactor. The sorbent formulation specified for study during the base period of this project was zinc ferrite. Zinc titanate sorbents are being studied under two options to the base contract. Specific objectives of the zinc titanate sorbent development work are the following: The effect of following process variables was investigated o the performance of zinc titanate sorbents: Method of sorbent preparation, Composition of fuel gas, Zn to Ti ratio of the sorbent, Sulfidation temperature, and Superficial gas velocity. The effect of first three variables has been covered in RTI's 1991 paper (Gupta and Gangwal, 1991b), while the effect of temperature and superficial gas velocity is described here.
Author : Ranjani V. Siriwardane
Publisher :
ISBN 13 :
Total Pages : 16 pages
Book Rating : 4.:/5 (395 download)
Download or read book Durable Zinc Oxide Containing Sorbents for Moving Bed and Fluid-Bed Applications written by Ranjani V. Siriwardane and published by . This book was released on 1998 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (683 download)
Download or read book Testing and Technology Transfer for Zinc Titanate Sorbent in a Titania Matrix. Technical Report, September 1, 1995--November 30, 1995 written by and published by . This book was released on 1995 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: For new coal gasification systems, zinc-based sorbents are being developed to remove sulfur from the hot product gas prior to its use in combined-cycle gas turbines and high- temperature fuel cells. In general, the properties of these sorbents are considered to be very attractive, but there are still concerns about degradation of mechanical properties and sulfur capacity over many sulfidation- regeneration cycles. It is believed that containing zinc titanate in a matrix of excess titania could solve both problems, which is the objective of this project. During this quarter, plans were made for United Catalysts, Inc. to produce two batches of the sorbent using a commercial extrusion process. A subcontract was just issued to the Research Triangle Institute for sorbent characterization and for a 50- cycle performance test designed to simulate the General Electric Company's moving-bed reactor conditions. In a parallel effort, numerous contacts were made on the technology transfer task.
Download or read book Zinc Titanate Sorbents written by and published by . This book was released on 1998 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The present invention provides a zinc titanate sorbent material useful in desulfurization applications. The zinc titanate material is in the form of generally spherical particles of substantially uniform chemical distribution. The sorbent material is capable of absorbing sulfur compounds from a gaseous feed in an amount of at least about 15 weight percent based on the weight of the sorbent. The sorbent material is prepared by a process including: (a) forming a zinc oxide/titanium dioxide dry blend, (b) preparing a substantially uniform aqueous slurry comprising the zinc oxide/titanium dioxide dry blend, organic binder, and at least about 1 weight percent inorganic binder based on the solids weight of the slurry, (c) spray drying the slurry to produce substantially spherical particles, and (d) calcining the particles at a temperature of between about 750.degree. C. to about 950.degree. C. The dry blend is formed by mixing between about 0.5 to about 2 parts zinc oxide having a median particle size of less than about 0.5 .mu., and about 1 part titanium dioxide having a median particle size of less than about 1 .mu. The slurry contains substantially no free silica and may be prepared by the process including (1) preparing an aqueous solution of organic binder, (2) adding the dry blend to the aqueous solution of organic binder, and (3) adding the inorganic binder to the solution of organic binder, and blend. Additional reagents, such as a surfactant, may also be incorporated into the sorbent material. The present invention also provides a process for desulfurizing a gaseous stream. The process includes passing a gaseous stream through a reactor containing an attrition resistant zinc titanate sorbent material of the present invention.
Author : Babcock & Wilcox Company
Publisher : Babcock & Wilcox Company
ISBN 13 :
Total Pages : 1086 pages
Book Rating : 4.3/5 (91 download)
Download or read book Steam, Its Generation and Use written by Babcock & Wilcox Company and published by Babcock & Wilcox Company. This book was released on 1992 with total page 1086 pages. Available in PDF, EPUB and Kindle. Book excerpt: STEAM/ITS GENERATION & USE, published by Babcock & Wilcox, is an accepted, authoritative text on steam & power generation. The new 40th edition, issued at the end of 1992, has been expanded by 60% and the material from the previous edition has been completely rewritten & reorganized to incorporate the many advances in power technology worldwide. Overall the book has increased from 36 to 57 chapters, & detailed appendices have been added. The book now totals 1064 pages with 950 illustrations. The focus of the new edition is to analyze & incorporate industry developments since the last edition, especially environmental protection, while looking well into the 21st century. STEAM provides comprehensive coverage of the steam power generation field from fundamentals, fuels, combustion & steam generation to boiler system components, energy systems, environmental control & nuclear systems. Application of systems is addressed with material covering manufacturing, construction, operation, maintenance & life extension. First issued in 1875, STEAM is the longest continuously published text in the world describing steam & power generation. To order contact: Babcock & Wilcox, Steam 40, P.O. Box 351, 20 S. Van Buren Ave., Barberton, OH 44203 or phone (216) 753-4511, FAX (216) 860-1886.
Author : Robert J. Copeland
Publisher :
ISBN 13 :
Total Pages : 11 pages
Book Rating : 4.:/5 (113 download)
Download or read book A Low Cost, Long Life Zinc Oxide Based Sorbent written by Robert J. Copeland and published by . This book was released on 1996 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 880 pages
Book Rating : 4.F/5 ( download)
Download or read book Coal Abstracts written by and published by . This book was released on 1993 with total page 880 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Robert J. Copeland
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (113 download)
Download or read book A Long Life Zinc Oxide written by Robert J. Copeland and published by . This book was released on 1995 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Attrition-resistant Zinc Titanate Sorbent for Sulfur written by and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
