Search Results

Advanced search parameters have been applied.
open access

Chemistry of coal-related microparticles. [Quarterly report], 1 July 1991--31 September 1991

Description: The objective of this research is to develop and apply novel single microparticle techniques to perform simultaneously thermogravimetric analysis and Raman/fluorescence spectroscopies on microparticles of coal (macerals) and sorbents (CaO) used for coal desulfurization. The combination electrodynamic balance/spectrometer system is being used to chemically characterize macerals from different ranks of coal and to explore the chemistry and chemical reaction rates associated with processes involvi… more
Date: December 31, 1991
Creator: Davis, E. J. & Krieger-Brockett, B.
Partner: UNT Libraries Government Documents Department
open access

Mulled coal---A beneficiated coal form for use as a fuel or fuel intermediate. Final technical progress report No. 3, October 1, 1990--December 31, 1990

Description: The storage, transport and handling of beneficiated coals in the form of a modified wet cake (``mulled coal``) to yield a coal water fuel having acceptable properties for atomization and combustion on industrial, commercial and/or residential scales, have been investigated. The Mulled Coal project is divided into a series of tasks designed to produce formulations and system designs suitable to convert fine coal ``wet cakes`` into a material that can be stored, handled, and transported to a site… more
Date: May 1, 1991
Partner: UNT Libraries Government Documents Department
open access

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.
Partner: UNT Libraries Government Documents Department
open access

Fundamental Studies of Water Pretreatment of Coal. Seventh Quarterly Report, April 1, 1991--June 30, 1991

Description: During the seventh quarter, water pretreatment experiments were done at lower pressures (1000 psig), with early H{sub 2}O injection or continuous H{sub 2}O injection, and with demineralized coals. In addition, a set of blank experiments was done with all four coals in helium at the following conditions: 350{degrees}C; 4000 psig; 20 minutes. An additional experiment was done with the Zap lignite at atmospheric pressure. Helium was used instead of nitrogen since it can be obtained in highly pure … more
Date: October 25, 1991
Creator: Serio, M. A.; Solomon, P. R.; Kroo, E.; Charpenay, S. & Bassilakis, R.
Partner: UNT Libraries Government Documents Department
open access

VHF EPR determination of the chemical forms of organic sulfur in coal. Final technical report, September 1, 1990--August 31, 1991

Description: This program addresses the need for innovative approaches to characterize the organic sulfur in Illinois Basin coals. We have developed a very high frequency electron paramagnetic resonance (EPR) spectrometer operating at the W-band of microwave frequencies (96 GHz). This instrument has shown unique sensitivity to heteroatoms in coal, and we believe the technique can be successfully applied for the non-destructive, direct determination of organic sulfur in coal. Preliminary data from Illinois c… more
Date: December 31, 1991
Creator: Clarkson, R. B.
Partner: UNT Libraries Government Documents Department
open access

Coal liquefaction process streams characterization and evaluation: The application of {sup 252}Cf-plasma desorption mass spectrometry to analysis of direct coal liquefaction heavy products

Description: This study demonstrated the feasibility of using {sup 252}Cf PDMS, GPC, and MPLC for the examination of the tetrahydrofuran (THF)-soluble portion of distillation resid materials derived from direct coal liquefaction. The {sup 252}Cf-PDMS technique was used to determine molecular weight distributions of twenty-five THF-soluble resids. In order to detemine if {sup 252}Cf-PDMS responds differently to different chemical classes of compounds, Lehigh separated five of the samples into chemically dist… more
Date: October 1, 1992
Creator: Larsen, J. W. & Lapucha, A. R.
Partner: UNT Libraries Government Documents Department
open access

Cooperative research on the combustion characteristics of cofired desulfurized Illinois coal and char with natural gas. Final technical report, September 1, 1991--August 31, 1992

Description: The DTFF is extended to larger sample collecting capability and higher temperatures, resulting in the establishment of the Ash Characterization Facility and the High Temperature Drop Tube Furnace. The Ash Characterization Facility enables continuous coal injection and sampling under controlled conditions. Several hundred milligrams of char or ash can be collected in one-half hour. The High Temperature Drop Tube Furnace uses a plasma torch to preheat the gas to over 2000 K and inject it into a c… more
Date: December 31, 1992
Creator: Buckius, R. O.; Wu, Cheng-Kang; Krier, H. & Peters, J. E.
Partner: UNT Libraries Government Documents Department
open access

High temperature alkali corrosion of ceramics in coal gas. Quarterly progress report {number_sign}9: September 1--December 1, 1993

Description: High temperature alkali corrosion has been known to cause premature failure of ceramic components used in advanced high temperature coal combustion systems such as coal gasification and clean-up, coal fired gas turbines, and high efficiency heat engines. The objective of this research is to systematically evaluate the alkali corrosion resistance of the most commonly used structural ceramics including silicon carbide, silicon nitride, cordierite, mullite, alumina, aluminum titanate, zirconia, an… more
Date: December 1, 1993
Creator: Pickrell, G. R.; Sun, T. & Brown, J. J.
Partner: UNT Libraries Government Documents Department
open access

Measurement and Modeling of Advanced Coal Conversion Processes. 23rd Quarterly Report, April 1, 1992--June 30, 1992

Description: The overall objective of this program is the development of predictive capability for the design, scale up, simulation, control and feedstock evaluation in advanced coal conversion devices. This technology is important to reduce the technical and economic risks inherent in utilizing coal, a feedstock whose variable and often unexpected behavior presents a significant challenge. This program will merge significant advances made at Advanced Fuel Research, Inc. (AFR) in measuring and quantitativel… more
Date: December 31, 1992
Creator: Solomon, P. R.; Serio, M. A.; Hamblen, D. G.; Smoot, L. D. & Brewster, B. S.
Partner: UNT Libraries Government Documents Department
open access

Hydrothermal Pretreatment of Coal. Quarterly Report No. 4, July 16--October 15, 1990

Description: During this period we studied the effects of 350{degrees}C treatment on Argonne-supplied Wyodak coal with n-alkane undecane in place of water in both 30 min. and 5 hr. experiments. Undecane was chosen because it has a critical temperature of 363{degrees}C (calculated), similar to that for water, and is present as a liquid phase at conditions. We anticipated results little different from those from the simple thermal treatment (coal under N{sub 2}) at the same conditions. In that case we had fou… more
Date: January 3, 1991
Creator: Loo, Bock & Ross, David S.
Partner: UNT Libraries Government Documents Department
open access

Protocols for the selective cleavage of carbon-sulfur bonds in coal. Final technical report, September 1, 1991--August 31, 1992

Description: Summarized in the final technical report for our project ``Protocols for the Selective Cleavage of Carbon-Sulfur Bonds in Coal`` are results of research pertaining to chemical reactions that aim to selectively cleave C-S bonds in model compounds as well as Illinois coal. Removal of the organic sulfur in coal constitutes one of the major challenges facing fossil fuel scientists today. A cost-effective means of desulfurizing Illinois coal is, at present, non-existent. Research in our group aims t… more
Date: December 31, 1992
Creator: Bausch, M.
Partner: UNT Libraries Government Documents Department
open access

Correlation of stability/rheology relationship with coal properties and chemical additives. Quarterly progress report, December 15, 1989--March 15, 1990

Description: The overall objective of this project is to perform experiments to evaluate the necessary boundary conditions in the preparation and utilization of Coal Water Slurries and also develop a data base for the conceptual analysis of a prescription to predict slurry quality for a given coal candidate.
Date: December 31, 1990
Creator: Ohene, F.
Partner: UNT Libraries Government Documents Department
open access

Thermal treatment for chlorine removal from coal. Final technical report, September 1, 1991--December 31, 1992

Description: It was the goal of this research to provide the technical basis for development of a process to remove chlorine from coal prior to combustion, based on a thermal treatment process. Reaction rate constants and activation energy have been determined, and energy and mass balances performed. Substitution of a synthetic flue gas (7% 0{sub 2}, 12% CO{sub 2}, 81% N{sub 2}) for nitrogen in the tube furnace resulted in at least equivalent chlorine removal (85.5%) compared to nitrogen. The fluidized bed … more
Date: December 31, 1992
Creator: Muchmore, C. B.; Hesketh, H. E. & Chen, Han Lin
Partner: UNT Libraries Government Documents Department
open access

Development of analytical procedures for coprocessing. Final technical report

Description: One phase of improving understanding of the fundamental chemistry of coprocessing involves development of the ability to distinguish between products originating from coal versus those originating from petroleum resid. A primary objective of this project was to develop analytical techniques to determine the source (coal versus resid) of the various compound types found in coprocessing products. A corollary objective was to develop an expanded knowledge of the detailed composition of coprocessin… more
Date: July 1, 1991
Creator: Anderson, R. P.; Green, J. B. & Vogh, J. W.
Partner: UNT Libraries Government Documents Department
open access

Catalysis and co-catalysis of bond cleavages in coal and coal analogs. Quarterly report, August 1, 1992--October 31, 1992

Description: The catalytic efficiency of 2-pyridone and 4-pyridone (tautomers of 2-hydroxy and 4-hydroxypyridine) for transfer hydrogenolysis of dinaphthyl ether in tetralin at 450 C was investigated. The effectiveness of 2-pyridone dropped when the reaction time was increased, suggesting that the catalyst is destroyed. Reaction of a compound with bromine in CCl{sub 4} yielded a rearrangement product with a minor amount of the cyclization product; in acetonitrile, only the rearrangement product is obtained.
Date: December 31, 1992
Creator: Miller, B.
Partner: UNT Libraries Government Documents Department
open access

Rhelogical properties essential for the atomization of coal water slurries (CWS). Quarterly progress report, June 15, 1992--September 15, 1992

Description: The overall objective of this project is to perform experiments to understand the effect of high shear and extensional properties on the atomization of coal-water slurries (CWS). In the atomization studies, the mean drop size of the CWS sprays will be determined at various air-to CWS. A correlation between the extensional and high shear properties, particle size distributions and the atomization will be made in order to determine the influence of these parameters on the atomization of CWS. Duri… more
Date: December 31, 1992
Creator: Ohene, F.
Partner: UNT Libraries Government Documents Department
open access

Surface electrochemical control for fine coal and pyrite separation. Technical progress report, July 1, 1991--September 30, 1991

Description: The ongoing work includes the characterization of coal pyrites, the floatability evaluation of three typical US coal samples, the flotation behavior of coal pyrites, the electrochemical measurement of the surface properties of coal pyrites, and the characterization of species produced at pyrite surfaces. This report covers a Raman spectroscopy of species produced electrochemically on pyrite surfaces.
Date: December 31, 1991
Creator: Hu, Weibai; Huang, Qinping; Li, Jun; Riley, A.; Turcotte, S. B.; Benner, R. E. et al.
Partner: UNT Libraries Government Documents Department
open access

Establishment and maintenance of a coal sample bank and data base. Final report, April 8, 1988--September 28, 1993

Description: This DOE contract continued support for the DOE Coal Sample Bank and Data Base at Penn State. At the beginning of the contract, a new type of container was evaluated for long-term storage of coal samples ranging in quantity from a few grams to over 10 kg (22 lbs). Gieseler fluid behavior, oxidation of pyrite to sulfates, loss of heating value, and other properties were monitored over time. Based on preliminary results, these foil and polyethylene laminate bags were believed to be a significant … more
Date: November 1, 1993
Creator: Davis, A. & Glick, D. C.
Partner: UNT Libraries Government Documents Department
open access

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.
Partner: UNT Libraries Government Documents Department
open access

Behavior of sulfur and chlorine in coal during combustion and boiler corrosion. Technical report, December 1, 1992--February 28, 1993

Description: The goals of this project is to investigate the behavior of sulfur and chlorine during pyrolysis and combustion of Illinois coals, the chemistry of boiler deposits and the process of ash formation, and remedial measures to reduce the sulfur and chlorine compounds in combustion gases. The chemistry of boiler deposits provides information about the behavior of sulfur, chlorine, and ash particles during coal combustion. We report results obtained during this quarter on mineralogical and chemical c… more
Date: May 1, 1993
Creator: Chou, C. L.; Hackley, K. C.; Cao, J.; Frost, R. R.; Ruch, R. R.; Pan, W. P. et al.
Partner: UNT Libraries Government Documents Department
open access

Methods for the speciation and determination of arsenic and selenium in coal combustion products

Description: Methods of sample preparation for the determination of total selenium, and selenite, selenate, arsenite, and arsenate in coal fly ash materials were evaluated. The measurement methods use atomic spectroscopy for the determination of total concentrations and ion chromatography (IC) for the determination of individual ionic species. Sample preparation procedures which minimize the loss or alteration of the species of interest was explored and defined. The utility of the sample preparation methods… more
Date: November 1, 1991
Creator: Schabron, J. F.; Hart, B. K.; Niss, N. D. & Brown, T. H.
Partner: UNT Libraries Government Documents Department
open access

Size distributions of fly ash using Coulter Multisizer: Use of multiple orifices and fitting to truncated log-normal distributions

Description: Fly ash particles, which are predominantly spherical and glassy, are produced by melting of the mineral inclusions in the coal during combustion. Particle diameters can range from sub-micrometer (micron or {mu}m) to greater than 100 {mu}m. The size distribution of fly ash is needed to determine its role in the radiation transfer process in pulverized coal combustors. The Coulter Multisizer is an useful instrument for sizing powders with a broad size distribution. A single Multisizer orifice can… more
Date: November 1, 1991
Creator: Ghosal, S.; Ebert, J. L. & Self, S. A.
Partner: UNT Libraries Government Documents Department
open access

Refining of fossil resin flotation concentrate from western coal. First quarterly final report, February 23, 1993--March 31, 1993

Description: During the first quarter of the project, from February 22, 1993 to March 31, 1993, the major work is to conduct project work plan and to organize the research term in order to successfully conduct this fossil resin refining project. Under a previous DOE-funded program, University of Utah and APT conducted a serious pilot-plant tests of selective flotation of fossil resin from Wasatch plateau coal (both UPL coal and CO-OP coal mines) of south central Utah. About 200 lbs high grade fossil resin f… more
Date: April 30, 1993
Creator: Miller, J. D.
Partner: UNT Libraries Government Documents Department
open access

Clean, premium-quality chars: Demineralized and carbon enriched. Final technical report, 1 September, 1992--31 August, 1993

Description: The overall objective of this two-year project was to evaluate methods of preparing demineralized and carbon enriched chars from Illinois Basin coals. The two processing steps, physical cleaning and devolatilization under different environments, led to the following results. Cleaning coal incompletely removes mineral matter which decreases catalytic activity and increases micropore structure. Water forms hydrogen bonds to oxygen functional groups in coal, and during drying, coals undergo struct… more
Date: December 31, 1993
Creator: Smith, G. V.; Malhotra, V. M. & Wiltowski, T.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen