70 Matching Results

Search Results

Results: 1 - 24 next
open access

Pyrolysis and gasification of coal at high temperatures

Description: The macropore structure of chars is a major factor in determining their reactivity during the gasification stage. The major objectives of this contract were to (a) quantify by direct measurements the effect of pyrolysis conditions of the macropore structure, and (b) establish how the macropores affected the reactivity pattern, the ignition behavior and the fragmentation of the char particles during gasification in the regime of strong diffusional limitations. Results from this project provide m… more
Date: February 10, 1992
Creator: Zygourakis, K.
Partner: UNT Libraries Government Documents Department
open access

Development of improved iron Fischer-Tropsch catalysts

Description: The objective of proposed research is development of catalysts with enhanced slurry phase activity and better selectivity to fuel range products, through a more detailed understanding and systematic studies of the effects of pretreatment procedures and promoters/binders (silica) on catalyst performance.
Date: January 10, 1992
Creator: Bukur, D.B.
Partner: UNT Libraries Government Documents Department
open access

Synergistic capture mechanisms for alkali and sulfur species from combustion

Description: An aerosol reactor system has been designed and constructed for the systematic study of the mechanisms governing the possible synergistic capture of sulfur oxide and alkalis with aluminosilicates and lime (CaO). Actual particle dynamics found in coal combustor systems can be simulated, mass balances can be closed, and the system conditions are well controlled. The collection of hot reactive aerosol flows is performed utilizing an isokinetic probe.
Date: January 10, 1992
Creator: Peterson, T.W.; Shadman, F.; Wendt, J.O.L. & Olsen, E.
Partner: UNT Libraries Government Documents Department
open access

DC CICC Retrofit Magnet Preliminary Design, Software Development and Analysis Report

Description: The proposed retrofit coil is made of superconducting Cable-in-Conduit Conductor (CICC). The coils are designed to produce a nominal vertical field of 4.5 tesla within the MHD channel based on a nominal current density of 13.05 MA/m{sup 2}. The coils are supported within a case, or so-called constant tension strap. When the magnet is energized, the electromagnetic J {times} B body forces push the winding pack laterally outward and vertically towards the machine's midplane, thus putting the stra… more
Date: February 10, 1992
Creator: Myatt, R. Leonard & Marston, P. G.
Partner: UNT Libraries Government Documents Department
open access

A novel approach to highly dispersing catalytic materials in coal for gasification

Description: This project seeks to develop a technique, based on coal surface properties, for highly dispersing catalysts in coal for gasification and to investigate the potential of using potassium carbonate and calcium acetate mixtures as catalysts for coal gasification. The lower cost and higher catalytic activity of the latter compound will produce economic benefits by reducing the amount of K{sub 2}CO{sub 3} required for high coal char reactivities. As was shown in previous reports, coal loading with p… more
Date: February 10, 1992
Creator: Abotsi, G.M.K. & Bota, K.B.
Partner: UNT Libraries Government Documents Department
open access

The Savannah River Site's Groundwater Monitoring Program

Description: The Environmental Protection Department/Environmental Monitoring Section (EPD/EMS) administers the Savannah River Site's (SRS) Groundwater Monitoring Program. During second quarter 1991 EPD/EMS conducted extensive sampling of monitoring wells. EPD/EMS established two sets of flagging criteria in 1986 to assist in the management of sample results. The flagging criteria do not define contamination levels; instead, they aid personnel in sample scheduling, interpretation of data, and trend identifi… more
Date: January 10, 1992
Partner: UNT Libraries Government Documents Department
open access

Synergistic capture mechanisms for alkali and sulfur species from combustion

Description: Due to the generation of a wide variety of pollutants during coal combustion, research on the development of a multifunction sorbent for adsorbing SO{sub 2} and alkali compounds simultaneously is ongoing at the University of Arizona. The current work focuses on the thermodynamic behavior of the reacting system for alkali adsorption especially in gas phase. The temperature and pressure effects on sodium species and on the system are intensively investigated under the simulated flue gas compositi… more
Date: January 10, 1992
Creator: Peterson, T.W.; Shadman, F.; Wendt, J.O.L. & Wu, Baochun.
Partner: UNT Libraries Government Documents Department
open access

Synergistic capture mechanisms for alkali and sulfur species from combustion

Description: The research described here is directed towards an investigation of mechanisms governing the capture of alkali metals and SO{sub 2} by injection of clay based sorbents into a combustor environment. While the species of interest are products of coal combustion, the earlier parts of these investigations will use a gas flame doped with relevant levels of Potassium, Sodium and Sulfur dioxide typical of a coal flame environment. This ensures that the particles so sampled from the combustor are from … more
Date: January 10, 1992
Creator: Peterson, T.W.; Shadman, F.; Wendt, J.O.L. & Mwabe, P.O.
Partner: UNT Libraries Government Documents Department
open access

Reactivity of young chars via energetic distribution measurements

Description: We have developed what we believe to be the very first a priori prediction technique for the gasification reactivity of coal char. With this method the gasification reactivity of a coal char as function of temperature can be predicted from a single temperature programmed desorption (TPD) experiment following mild gasification at a single temperature (Calo et al., 1989; Hall and Calo, 1990a). This approach has been demonstrated for C0{sub 2} gasification of coal chars where the gasification reac… more
Date: June 10, 1992
Creator: Calo, J.M.; Zhang, L.H.; Lu, W. & Lilly, W.D.
Partner: UNT Libraries Government Documents Department
open access

Nuclear studies with intermediate energy probes. [Dept. of Physics, Univ. of Virginia]

Description: Data from measurements at NIKHEF-K of the electro-production of neutral pions from the proton were completely analyzed and axe about to be submitted for publication. These results represent the first precise measurement of this fundamental process in the threshold region. The results are completely consistent with calculations based upon the Low Energy Theorems. Results from studies of a gas jet target in the electron storage ring of the Saskatchewan Accelerator Laboratory (SAL) have been fully… more
Date: July 10, 1992
Creator: Norum, B.E.
Partner: UNT Libraries Government Documents Department
open access

Release of ammonia from HAN-type PHA

Description: A preliminary design basis for ammonia scrubbers in the DWPF has been issued. This design basis is based on a theoretical model of ammonia evolution from the SRAT, SME and RCT. It is desirable to acquire actual process data on ammonia evolution prior to performing detailed design of scrubbers for DWPF. The evolution of ammonia from the SRAT and SME in the Integrated DWPF Melter System (IDMS) was investigated during the HM4 run. In this run, Precipitate Hydrolysis Aqueous (PHA), which was made i… more
Date: June 10, 1992
Creator: Zamecnik, J. R.
Partner: UNT Libraries Government Documents Department
open access

LIMB Demonstration Project Extension and Coolside Demonstration

Description: This report presents results from the limestone Injection Multistage Burner (LIMB) Demonstration Project Extension. LIMB is a furnace sorbent injection technology designed for the reduction of sulfur dioxide (SO[sub 2]) and nitrogen oxides (NO[sub x]) emissions from coal-fired utility boilers. The testing was conducted on the 105 Mwe, coal-fired, Unit 4 boiler at Ohio Edison's Edgewater Station in Lorain, Ohio. In addition to the LIMB Extension activities, the overall project included demonstra… more
Date: November 10, 1992
Creator: Goots, T.R.; DePero, M.J. & Nolan, P.S.
Partner: UNT Libraries Government Documents Department
open access

Methyl chloride via oxyhydrochlorination of methane

Description: Purpose of this contract is to develop a process for converting light alkane gases to methyl chloride via oxyhydrochlorination using highly selective, stable catalysts (Cu) in either fixed-bed or fluid-bed reactors. Catalyst development and micro-packed bed screening studies are underway. Engineering support for pre-design on the miniplant is struggling with the unit operations problem associated with separation of products from unreacted methane.
Date: February 10, 1992
Creator: Naasz, B.
Partner: UNT Libraries Government Documents Department
open access

Synergistic capture mechanisms for alkali and sulfur species from combustion. Quarterly report No. 3, March--May 1991

Description: Due to the generation of a wide variety of pollutants during coal combustion, research on the development of a multifunction sorbent for adsorbing SO{sub 2} and alkali compounds simultaneously is ongoing at the University of Arizona. The current work focuses on the thermodynamic behavior of the reacting system for alkali adsorption especially in gas phase. The temperature and pressure effects on sodium species and on the system are intensively investigated under the simulated flue gas compositi… more
Date: January 10, 1992
Creator: Peterson, T. W.; Shadman, F.; Wendt, J. O. L. & Wu, Baochun
Partner: UNT Libraries Government Documents Department
open access

Statistical analysis of DWPF reference canister dimensions

Description: Twenty dimensional measurements were conducted on seven empty Defense Waste Processing Facility (DWPF) reference canisters. These measurements were repeated after the canisters were filled with simulated nuclear waste glass. An in-depth statistical analysis of the results indicated that changes do occur as a result of filling the steel canisters with glass poured at 1150{degree}C for four of the parameters. While small, these changes were statistically significant. The analysis indicates the ma… more
Date: September 10, 1992
Creator: Pickett, M. A. & Brown, K. G.
Partner: UNT Libraries Government Documents Department
open access

Integrated DWPF Melter System (IDMS) campaign report: Hanford Waste Vitrification Plan (HWVP) process demonstration

Description: Vitrification facilities are being developed worldwide to convert high-level nuclear waste to a durable glass form for permanent disposal. Facilities in the United States include the Department of Energy`s Defense Waste Processing Facility (DWPF) at the Savannah River Site, the Hanford Waste Vitrification Plant (HWVP) at the Hanford Site and the West Valley Demonstration Project (WVDP) at West Valley, NY. At each of these sites, highly radioactive defense waste will be vitrified to a stable bor… more
Date: August 10, 1992
Creator: Hutson, N. D.
Partner: UNT Libraries Government Documents Department
open access

Environmental and economic assessment of discharges from Gulf of Mexico Region oil and gas operations. Quarterly technical progress report, 23 June 1992--30 September 1992

Description: A Sampling and Analysis Plan was prepared and submitted to a Scientific Review Committee for comment. Substantial comments relative to study objectives, sampling design, and sampling periods coupled with the passage of Hurricane Andrew precluded the scheduled initiation of sampling at offshore and coastal sites (Tasks 3 -- Environmental Field Sampling and Analysis of Naturally Occurring Radioactive Materials (NORM), Heavy Metals, and Organics and 4 -- Monitoring of the Recovery of Impacted Wetl… more
Date: November 10, 1992
Creator: Gettleson, D. A.
Partner: UNT Libraries Government Documents Department
open access

Increased IMP dehydrogenase gene expression in solid tumor tissues and tumor cell lines

Description: IMP dehydrogenase, a regulatory enzyme of guanine nucleotide biosynthesis, may play a role in cell proliferation and malignancy. To assess this possibility, we examined IMP dehydrogenase expression in a series of human solid tumor tissues and tumor cell lines in comparison with their normal counterparts. Increased IMP dehydrogenase gene expression was observed in brain tumors relative to normal brain tissue and in sarcoma cells relative to normal fibroblasts. Similarly, in several B- and T-lymp… more
Date: July 10, 1992
Creator: Collart, F. R.; Chubb, C. B.; Mirkin, B. L. & Huberman, E.
Partner: UNT Libraries Government Documents Department
open access

Measurements and preliminary interpretation of K-Reactor foundation response to man-made seismic excitation

Description: In support of the Savannah River Technology Center (SRTC) effort to develop K-Reactor seismic design basis ground motions, SRTC monitored local high-explosive tests at a ``free-field`` site adjacent to K-Reactor and on the {minus}40 level on the foundation of K-Reactor. The high-explosive tests were part of the SRTC/United States Geological Survey (USGS) regional refraction and attenuation experiment that used deeply buried high explosive charges near New Ellenton, Snelling, and at more distant… more
Date: April 10, 1992
Creator: Lee, R. C. & Stephenson, D. E.
Partner: UNT Libraries Government Documents Department
open access

The Savannah River Site`s Groundwater Monitoring Program. Second quarter, 1991

Description: The Environmental Protection Department/Environmental Monitoring Section (EPD/EMS) administers the Savannah River Site`s (SRS) Groundwater Monitoring Program. During second quarter 1991 EPD/EMS conducted extensive sampling of monitoring wells. EPD/EMS established two sets of flagging criteria in 1986 to assist in the management of sample results. The flagging criteria do not define contamination levels; instead, they aid personnel in sample scheduling, interpretation of data, and trend identifi… more
Date: January 10, 1992
Partner: UNT Libraries Government Documents Department
open access

A novel approach to highly dispersing catalytic materials in coal for gasification. Ninth quarterly report, October 1, 1991--December 31, 1991

Description: This project seeks to develop a technique, based on coal surface properties, for highly dispersing catalysts in coal for gasification and to investigate the potential of using potassium carbonate and calcium acetate mixtures as catalysts for coal gasification. The lower cost and higher catalytic activity of the latter compound will produce economic benefits by reducing the amount of K{sub 2}CO{sub 3} required for high coal char reactivities. As was shown in previous reports, coal loading with p… more
Date: February 10, 1992
Creator: Abotsi, G. M. K. & Bota, K. B.
Partner: UNT Libraries Government Documents Department
open access

Pyrolysis and gasification of coal at high temperatures. Final technical report, September 15, 1987--September 14, 1991

Description: The macropore structure of chars is a major factor in determining their reactivity during the gasification stage. The major objectives of this contract were to (a) quantify by direct measurements the effect of pyrolysis conditions of the macropore structure, and (b) establish how the macropores affected the reactivity pattern, the ignition behavior and the fragmentation of the char particles during gasification in the regime of strong diffusional limitations. Results from this project provide m… more
Date: February 10, 1992
Creator: Zygourakis, K.
Partner: UNT Libraries Government Documents Department
Back to Top of Screen