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Sulfur removal in advanced two stage pressurized fluidized bed combustion. Technical report, September 1--November 30, 1994

Description: The objective of this study is to obtain data on the rates and the extent of sulfation reactions involving partially sulfided calcium-based sorbents, and oxygen as well as sulfur dioxide, at operating conditions closely simulating those prevailing in the second stage (combustor) of Advanced Two-Stage Pressurized Fluidized-Bed Combustors (PFBC). In these systems the CO{sub 2} partial pressure generally exceeds the equilibrium value for calcium carbonate decomposition. Therefore, calcium sulfate … more
Date: December 31, 1994
Creator: Abbasian, Javad; Hill, Andy; Wangerow, James R. & Honea, Franklin I.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Further studies of the effects of oxidation on the surface properties of coal and coal pyrite

Description: The objective of this research was to investigate the oxidation behavior of coal and coal pyrite and to correlate the changes in the surface properties induced by oxidation, along with the intrinsic physical and chemical properties of these organic and inorganic materials, with the behavior in physical coal cleaning processes. This provide more fundamental knowledge for understanding the way in which different factors interact in a medium as heterogeneous as coal. Fourteen coal samples of diffe… more
Date: December 31, 1994
Creator: Herrera, Miguel Nicholas
Item Type: Refine your search to only Thesis or Dissertation
Partner: UNT Libraries Government Documents Department
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Near-extinction and final burnout in coal combustion

Description: The late stages of char combustion have a special technological significance, as carbon conversions of 99% or greater are typically required for the economic operation of pulverized coal fired boilers. In the present article, two independent optical techniques are used to investigate near-extinction and final burnout phenomenas. Captive particle image sequences, combined with in situ optical measurements on entrained particles, provide dramatic illustration of the asymptotic nature of the char … more
Date: February 1, 1994
Creator: Hurt, R. H. & Davis, K. A.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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The directory of United States coal & technology export resources. Profiles of domestic US corporations, associations and public entities, nationwide, which offer products or services suitable for export, relating to coal and its utilization

Description: The purpose of this directory is to provide a listing of available U.S. coal and coal related resources to potential purchasers of those resources abroad. The directory lists business entities within the US which offer coal related resources, products and services for sale on the international market. Each listing is intended to describe the particular business niche or range of product and/or services offered by a particular company. The listing provides addresses, telephones, and telex/fax fo… more
Date: January 1, 1994
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Changes in Organic Sulfur Compounds in Coal Macerals During Liquefaction

Description: Several general trends were observed in reactivity patterns of sulfur compounds in macerals. Sulfur is reduced in the asphaltene fraction compared to initial maceral. Aliphatics are removed and polycyclic aromatic compounds are both stable and probably formed under these conditions. Molecules containing two sulfur atoms are formed. The preasphaltenes are now being analyzed by DEIHRMS.
Date: February 1, 1994
Creator: Winans, R. E.; Joseph, J. T. & Fisher, R. B.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Meeting on flows of granular materials in complex geometries

Description: The International Energy Agency Fossil Fuel Multiphase Flow Sciences Agreement has been in effect since 1986. The traditional mechanism for the effort has been information exchange, effected by the inclusion of scientists in annual Executive committee meetings, by exchange of reports and papers, and by visits of scientists to one another`s institutions. In a sequence of informal meetings and at the 1993 Executive committee meeting, held in Pittsburgh, US in March 1994, it was decided that more … more
Date: November 1, 1994
Creator: Passman, S. L.; Fukushima, E. & Evans, R. E.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Comparison of the activities of fine-particle size catalysts

Description: The objectives of Sandia`s fine-particle size catalyst testing project are to evaluate and compare the activities of the fine-particle size catalysts being developed in DOE/PETCs Advanced Research Coal Liquefaction Program by using standard coal liquefaction test procedures. The standard procedures use Blind Canyon coal, phenanthrene as the reaction solvent, and a factorial experimental design with temperatures from 350{degrees}C to 400{degrees}C, reaction times from 20 to 60 minutes, and catal… more
Date: December 31, 1994
Creator: Stohl, F. V.; Diegert, K. V. & Goodnow, D. C.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Advanced Turbine Systems Program conceptual design and product development. Annual report, August 1993--July 1994

Description: The stated objective of the project was to analyze and evaluate different cycles for the natural gas-fired Advanced Turbine Systems (GFATS) in order to select one that would achieve all of the ATS Program goals. Detailed cycle performance, cost of electricity, and RAM analysis were carried out to provide information on the final selection of the GFATS cycle. To achieve the very challenging goals, innovative approaches and technological advances are required, especially in combustion, aerodynami… more
Date: November 1, 1994
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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New catalysts for coal liquefaction and new nanocrystalline catalysts synthesis methods

Description: The use of coal as a source of transportation fuel is currently economically unfavorable due to an abundant world petroleum supply and the relatively high cost of coal liquefaction. Consequently, a reduction in the cost of coal liquefaction, for example by using less and/or less costly catalysts or lower liquefaction temperatures, must be accomplished if coal is to play an significant role as a source of liquid feedstock for the petrochemical industry. The authors and others have investigated t… more
Date: September 1, 1994
Creator: Linehan, J. C.; Matson, D. W. & Darab, J. G.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Electric power monthly, January 1994

Description: The Electric Power Monthly (EPM) presents monthly electricity statistics. The purpose of this publication is to provide energy decisionmakers with accurate and timely information that may be used in forming various perspectives on electric issues that lie ahead. Data in this report are presented for a wide audience including Congress, Federal and State agencies, the electric utility industry, and the general public. The EIA collected the information in this report to fulfill its data collection… more
Date: January 26, 1994
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Advanced direct coal liquefaction concepts - appendix

Description: This detailed appendix presents the results of direct coal liquefaction studies performed by the contractor. Several hundred tables summarizing the chemical compostion for runs of a bench scale reactor are presented.
Date: July 1, 1994
Creator: Berger, D. J.; Parker, R. J. & Simpson, P. L.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Final report for {open_quotes}Production of mild gasification co-products{close_quotes} project

Description: The SGI International Liquids From Coal (LFC) Process is a mild pyrolysis, or mild gasification, treatment that upgrades low-rank coals by removing almost all of the moisture and a substantial portion of the volatile matter. The process produces two value-added co-products: a Coal Derived Liquid (CDL) and a solid Process Derived Fuel (PDF). A third co-product, a low-heating-value non-condensible gas, is recirculated and combusted in a commercial sized plant to provide drying and pyrolysis proce… more
Date: December 4, 1994
Creator: Horne, D. A. & Castro, J. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Catalysis and co-catalysis of bond cleavages in coal and coal analogs. Final report, August 1, 1990--January 31, 1994

Description: In work prior to the inception of this project, the authors observed that mixtures of phenolic materials and polyalkoxyaromatic molecules were appreciably more effective in catalyzing the decompositions of di-2-naphthyl ether and of di-1-naphthyl sulfide in tetralin solutions at 450{degrees}C than were the phenols by themselves, even though the polyalkoxyaromatic molecules, in the absence of phenolic co- catalysts, show essentially no catalytic activity. This was of appreciable interest in coal… more
Date: May 1, 1994
Creator: Miller, B.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Fluid dynamics of pressurized, entrained coal gasifiers. Second quarterly technical progress report, January 1, 1994--March 31, 1994

Description: Pressurized, entrained gasification is a promising new technology for the clean and efficient combustion of coal. Its principle is to operate a coal gasifier at a high inlet gas velocity to increase the inflow of reactants, and at an elevated pressure to raise the overall efficiency of the process. Unfortunately, because of the extraordinary difficulties involved in performing measurements in hot, pressurized, high-velocity pilot plants, its fluid dynamics are largely unknown. Thus the designer… more
Date: May 1, 1994
Creator: Louge, M. Y.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Heteronuclear probes of coal structure and reactivity. Quarterly report, October--December 1993

Description: This progress report highlights seven achievements on the project. Vacuum impregnation of Ill. No. 6 with PBu{sub 3} raised the sulfur removal from 92 to 99%. Pre-drying the coal does not alter this result. Whereas partial sulfur removal by PBu{sub 3} from dibenzothiophene is catalyzed by Ill. No. 6, graphite is not a catalyst. Whereas FeCl{sub 3} catalyzes quantitative sulfur removal by PBu{sub 3} from dibenzothiophene, zerovalent iron solubilized as Fe(PBu{sub 3}){sub x} in PBu{sub 3} is not.… more
Date: January 31, 1994
Creator: Verkade, J. G. & Hall, G.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Investigation of coal structure. Quarterly report No. 7, October 1, 1993--December 31, 1993

Description: The objective of this project is to investigate the physical structure of coal illustrated. Coal structure should be well understood to guarantee effective utilization. A better understanding of this physical structure is the first step for effective development of coal utilization processes. Solvent swelling and extraction are the two main investigative probes in this project. No single solvent tested to date can disrupt all of the relatively strong secondary interactions in coal. Various rela… more
Date: January 1, 1994
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Geohydrologic feasibility study of the Northern and Central Appalachian basin areas for the potential application of a production process patented by Jack W. McIntyre

Description: Geraghty & Miller, Inc. of Midland, Texas conducted geologic and hydrologic feasibility studies of the potential applicability of a patented (US Patent Office No. 4,766,957) process developed by Jack W. McIntyre for the recovery of natural gas from coalbed/sand formations in the Northern and Central Appalachian basin areas. General research, based on a review of published literature from both public and private sources, indicates that the generally thin, but numerous coalbeds found in the great… more
Date: March 1, 1994
Creator: Kvasnicka, D.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Combustion of pulverized coal in vortex structures. Quarterly progress report No. 2, January 1, 1994--March 31, 1994

Description: This second quarterly report describes the activities and accomplishments of the research team at the University of Oklahoma, Norman, Oklahoma, related to the project entitled ``Combustion of Pulverized Coal in Vortex Structures`` during the period January 1, 1994 to March 31, 1994. The construction of the experimental facility for generating two-dimensional shear layers containing vortex structures has been completed. Preliminary shake-down test of the test facility were conducted for debuggin… more
Date: April 1, 1994
Creator: Gollahalli, S. R.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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Applications of molecular modeling in coal research

Description: Over the past several years, molecular modeling has been applied to study various characteristics of coal molecular structures. Powerful workstations coupled with molecular force-field-based software packages have been used to study coal and coal-related molecules. Early work involved determination of the minimum-energy three-dimensional conformations of various published coal structures (Given, Wiser, Solomon and Shinn), and the dominant role of van der Waals and hydrogen bonding forces in def… more
Date: January 1, 1994
Creator: Carlson, G. A. & Faulon, J. L.
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Near-source observations from single and multiple cylindrical explosions in a coal mine

Description: An experimental study of ground motion from explosions designed to remove overburden in an open pit coal mine is reported. The purpose of this study is a characterization of these ground motions in the distance range of several tens of meters to several kilometers. The investigation has focused upon both single cylindrical sources with different explosive configurations as well as arrays of charges in the production mode. Critical to this study of source configuration and coupling is experiment… more
Date: June 1, 1994
Creator: Stump, B. W.; Pearson, D. C. & Yang, Xiaoning
Item Type: Refine your search to only Article
Partner: UNT Libraries Government Documents Department
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Coal-fueled diesel technology development: Nozzle development for coal-fueled diesel engines

Description: Direct injection of a micronized coal water mixture fuel into the combustion chambers of a diesel engine requires atomizing an abrasive slurry fuel with accurately sized orifices. Five injector orifice materials were evaluated: diamond compacts, chemical vapor deposited diamond tubes, thermally stabilized diamond, tungsten carbide with cobalt binder, and tungsten carbide with nickel binder with brazed and mechanically mounted orifice inserts. Nozzle bodies were fabricated of Armco 17-4 precipit… more
Date: January 1, 1994
Creator: Johnson, R. N.; Lee, M. & White, R. A.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
open access

Characterization of coal particles using rule base on-line image analysis. [Quarterly] technical report, December 1, 1993--February 28, 1994

Description: Different materials in coal reflect light in a different manner and, therefore, can be identified based on their image of light reflectance characteristics (i.e. shade of gray). Furthermore, liberated and nonliberated pyrite particles are surrounded by media of different shades of gray. With these two pieces of information, the degree of pyrite liberation and the degree of purity of coal macerals can be analyzed through a computer program. Ultimately, this image analysis computer program will a… more
Date: June 1, 1994
Creator: Yen, S. C. M. & Chu, T. C.
Item Type: Refine your search to only Report
Partner: UNT Libraries Government Documents Department
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