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Coal combustion: Effect of process conditions on char reactivity. Quarterly technical report, October 1, 1994--December 31, 1994
The project will quantify the effect of the following pyrolysis conditions on the macropore structure and on the subsequent reactivity of chars: (a) pyrolysis heating rate; (b) final heat treatment temperature (HTT); (c) duration of heat treatment at HTT (or soak time); (d) pyrolysis atmosphere (N{sub 2} or O{sub 2}/N{sub 2} mixtures); (e) coal particle size (100--1000 {mu}m in diameter); (f) sulfur-capturing additives (limestone); and (g) coal rank. Pyrolysis experiments will be carried out for three coals from the Argonne collection: (1) a high-volatile bituminous coal with high ash content (Illinois No. 6), (2) a bituminous coal with low ash content (Utah Blind Canyon) and (3) a lower rank subbituminous coal (Wyodak-Anderson seam). A systematic parametric study was carried out in the past quarter to quantify the effect of different process parameters on the ignition phenomena. Using the mathematical model presented in the previous quarterly report, we investigated how char properties (porosity, particle size, macropore surface area, and micropore radius) and operating conditions (oxygen concentration, flow rate) affect ignition phenomena. In every case, we clearly identified the temperature range in which thermal ignitions may be expected. Model predictions will next be compared to experimental results to validate our theoretical model.
Date:
December 31, 1994
Creator:
Zygourakis, K.
System:
The UNT Digital Library
Coal liquefaction model compounds. Final report, September 1, 1992--August 31, 1994
This final report is divided into sections dealing with tetralin pyrolysis, chroman pyrolysis, molecular mechanics of organometallic systems, and pi conjugated biradicals. Experiments performed and results are discussed for each area of study.
Date:
December 31, 1994
Creator:
Gajewski, J.J. & Gilbert, K.E.
System:
The UNT Digital Library
Coherent V{sub 2}O{sub 3} precipitates in {alpha}-Al{sub 2}O{sub 3} co-implanted with vanadium and oxygen
The oxides of vanadium VO{sub 2} and V{sub 2}O{sub 3} are of fundamental and practical interest since they undergo structural phase transitions during which large variations in their optical and electronic properties are observed. In the present work, the authors report the formation of buried precipitates of V{sub 2}O{sub 3} in sapphire by ion implantation and thermal annealing. It was found that the co-implantation of oxygen and vanadium was required in order to form nanophase V{sub 2}O{sub 3} precipitates. Additionally, these precipitates, which formed only following an anneal of the co-implanted sample under reducing conditions, are coherent with the sapphire lattice. Two epitaxial relationships were observed: (0001)V{sub 2}O{sub 3}//(0001) {alpha}-Al{sub 2}O{sub 3} and (11--20)V{sub 2}O{sub 3}//(0001) {alpha}-Al{sub 2}O{sub 3}. This finding is in agreement with results obtained elsewhere for thin films of V{sub 2}O{sub 3} deposited on c-axis-oriented sapphire.
Date:
December 31, 1994
Creator:
Gea, L. A.; Boatner, L. A.; Budai, J. D. & Rankin, J.
System:
The UNT Digital Library
Combined removal of SO{sub x} and NO{sub x} from flue gas using non-thermal plasma. [Quarterly] technical report, September 1--November 30, 1994
The SO{sub 2} removal efficiency was studied for concentration in the range of 333--3000 ppM (parts per million). Since the sulfur content of Illinois coal is high, the SO{sub 2} concentration in typical flue gas is in the high end of the range shown above. With high concentration of SO{sub 2} the removal efficiency decreases. However, the removal scales well with applied voltage, electrode length, and supply frequency. In this period the modeling of the process was also accomplished. The results show that a Townsend-type discharge is more efficient than a streamer type discharge in producing OH and 0 radicals. This explains why UV-irradiation helps the removal efficiency. The details are discussed in the report.
Date:
December 31, 1994
Creator:
Dhali, S.K.
System:
The UNT Digital Library
Combustion of char-coal waste pellets for high efficiency and low NO{sub x}. Technical report, September 1--November 30, 1994
Illinois coals are prime candidates for use in Integrated Gasification Combined Cycle (IGCC) plants because of their high volatility and good char reactivity. In these plants, partial gasification of the coal in the presence of limestone eliminates the major portion of the sulfur species in the product gases, which are used as fuel for the topping cycle. The char produced is high in ash content, the major portion of which is calcium sulfide. It is also low in volatiles and of low density, compared to the parent coal. The economic success of the gasification route depends on the subsequent utilization of the residual char for raising steam for use in a Rankine cycle bottoming plant and/or preheating the air to the gasifier. Fluidized bed combustion of the char appears an attractive way of utilizing the char. Areas of concern in the fluidized bed combustion of the high ash, low volatility char are: attainment of high carbon conversion efficiencies; reduction of oxides of nitrogen emissions; reduction/elimination of corrosive chlorine species; reduction/elimination of sodium and other alkali species; and efficient usage of the calcium present in the ash to reduce sulfur compounds. The aim of the present project is to investigate ways …
Date:
December 31, 1994
Creator:
Rajan, S.
System:
The UNT Digital Library
Commercial demonstration of the NOXSO SO{sub 2}/NO{sub x} removal flue gas cleanup system. Quarterly technical progress report No. 12, December 1, 1993--February 28, 1994
The NOXSO process is a dry, post-combustion flue gas treatment technology which uses a regenerable sorbent to simultaneously adsorb sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) from the flue gas of a coal-fired utility boiler. In the process, the SO{sub 2} is reduced to sulfur by-product and the NO{sub x} is reduced to nitrogen and oxygen. It is predicted that the process can economically remove 90% of the acid rain precursor gases from the flue gas stream in a retrofit or new facility. The objective of the NOXSO Demonstration Project is to design, construct, and operate a flue gas treatment system utilizing the NOXSO process. The effectiveness of the process will be demonstrated by achieving significant reductions in emissions of sulfur and nitrogen oxides. In addition, sufficient operating data will be obtained to confirm the process economics and provide a basis to guarantee performance on a commercial scale. The project is presently in the project definition and preliminary design phase. Data obtained during pilot plant testing which was completed on July 30, 1993 is being incorporated in the design of the commercial size plant. A suitable host site to demonstrate the NOXSO process on a commercial scale is …
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
Commercial demonstration of the NOXSO SO{sub 2}/NO{sub x} removal flue gas cleanup system. Quarterly technical progress report No. 13, March 1, 1994--May 31, 1994
The NOXSO process is a dry, post-combustion flue gas treatment technology which uses a regenerable sorbent to simultaneously adsorb sulfur dioxide (SO{sub 2}) and nitrogen oxides (NO{sub x}) from the flue gas of a coal-fired utility boiler. In the process, the SO{sub 2} is converted to a sulfur by-product and the NO{sub x} is converted to nitrogen and oxygen. It is predicted that the process can economically remove 90% of the acid rain precursor gases from the flue gas stream in a retrofit or new facility. The objective of the NOXSO Demonstration Project is to design, construct, and operate a flue gas treatment system utilizing the NOXSO process. The effectiveness of the process will be demonstrated by achieving significant reductions in emissions of sulfur and nitrogen oxides. In addition, sufficient operating data will be obtained to confirm the process economics and provide a basis to guarantee performance on a commercial scale. The project is presently in the project definition and preliminary design phase. Data obtained during pilot plant testing which was completed on July 30, 1993 is being incorporated in the design of the commercial size plant. A suitable host site to demonstrate the NOXSO process on a commercial scale …
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
Commercial-scale demonstration of the Liquid Phase Methanol (LPMEOH{trademark}) process. Technical progress report number 2, July 1--September 30, 1994
The project involves the construction of a 260 tons-per-day (TPD) or 80,000 gallon per day methanol demonstration unit utilizing an existing coal-derived synthesis gas from Eastman. The new equipment consists of synthesis gas feed preparation and compression, liquid phase reactor and auxiliaries, product distillation, and utilities. The technology to be demonstrated was developed by Air Products in a DOE sponsored program that started in 1981. Originally tested at a small, DOE-owned experimental facility in LaPorte, Texas, the LPMEOH{trademark} process offers several advantages over current methods of making methanol. This liquid phase process suspends fine catalyst particles in an inert liquid, forming a slurry. The liquid dissipates heat from the chemical reaction away from the catalyst surface, protecting the catalyst and allowing the gas-to-methanol reaction to proceed at higher rates. The process is ideally suited to the type of gas produced by modern coal gasifiers. At the Eastman Chemical complex, the technology will be integrated with existing coal gasifiers to demonstrate the commercially important aspects of the operation of the LPMEOH{trademark} Process to produce methanol. A four-year demonstration will prove the commercial applicability of the process. An off-site product-use test program will prove the suitability of the methanol as a transportation …
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
A comparison of NH{sub 3} point monitoring and diode laser based path integrated measurements
Measurements made using two different types of ammonia monitors during a two-month field study in the summer of 1994 are discussed. The first was a diode-laser based open path monitor designed for automated operation in an industrial environment. The second is a monitoring analyzer based on thermal decomposition of ammonia to NO and subsequent analysis by O{sub 3}-NO chemiluminescence. The two monitors provided consistent measurements of ammonia concentration during weeks of continuous unattended operation.
Date:
December 31, 1994
Creator:
Goldstein, N.; Richtsmeier, S. C.; Lee, J.; Bien, F.; Fetzer, G. J. & Groff, K. W.
System:
The UNT Digital Library
Comparison of rainfall sampling schemes using a calibrated stochastic rainfall generator
Accurate rainfall measurements are critical to river flow predictions. Areal and gauge rainfall measurements create different descriptions of the same storms. The purpose of this study is to characterize those differences. A stochastic rainfall generator was calibrated using an automatic search algorithm. Statistics describing several rainfall characteristics of interest were used in the error function. The calibrated model was then used to generate storms which were exhaustively sampled, sparsely sampled and sampled areally with 4 x 4 km grids. The sparsely sampled rainfall was also kriged to 4 x 4 km blocks. The differences between the four schemes were characterized by comparing statistics computed from each of the sampling methods. The possibility of predicting areal statistics from gauge statistics was explored. It was found that areally measured storms appeared to move more slowly, appeared larger, appeared less intense and have shallower intensity gradients.
Date:
December 31, 1994
Creator:
Welles, E.
System:
The UNT Digital Library
Competitive ion kinetics in direct mass spectrometric organic speciation. 1994 Progress report
The experimental work on the gas phase proton affinity (PA) scale, discussed in some detail in last year`s Progress Report, will be completed within the next few weeks. Basically this effort involves the development of a precise and accurate interlocking ladder of relative PA`s derived from the temperature dependence of proton transfer equilibria incorporating a variety of reactant pairs using the technique of pulsed high pressure mass spectrometry (NIST has the only US facility). The PA subset under investigation was expanded from the original list to cover the region between CH{sub 3}CHO and (CH{sub 3}){sub 2}CO, which spans a PA range of approximately 12 kcal/mol. More than 300 separate equilibrium measurements have been carried out to date over the temperature range 240--395 C. The thermochemical region under study creates a bridge between the so-called upper and lower PA scales, and includes two primary reference standards, CH{sub 3}CHO and i-C{sub 4}H{sub 8}, with PA`s independently defined elsewhere via photoionization techniques.
Date:
December 31, 1994
Creator:
Sieck, L.W.
System:
The UNT Digital Library
A comprehensive software system for image processing and programming. Final report
XVision is an example of a comprehensive software system dedicated to the processing of multidimensional scientific data. Because it is comprehensive it is necessarily complex. This design complexity is dealt with by considering XVision as nine overlapping software systems, their components and the required standards. The complexity seen by a user of XVision is minimized by the different interfaces providing access to the image processing routines as well as an interface to ease the incorporation of new routines. The XVision project has stressed the importance of having: (1) interfaces to accommodate users with differing preferences and backgrounds and (2) tools to support the programmer and the scientist. The result is a system that provides a framework for building a powerful research, education and development tool.
Date:
December 31, 1994
Creator:
Rasure, J.; Hallett, S. & Jordan, R.
System:
The UNT Digital Library
Computational and experimental studies of hydrodynamic instabilities and turbulent mixing: Review of VNIIEF efforts. Summary report
The report presents the basic results of some calculations, theoretical and experimental efforts in the study of Rayleigh-Taylor, Kelvin-Helmholtz, Richtmyer-Meshkov instabilities and the turbulent mixing which is caused by their evolution. Since the late forties the VNIIEF has been conducting these investigations. This report is based on the data which were published in different times in Russian and foreign journals. The first part of the report deals with calculations an theoretical techniques for the description of hydrodynamic instabilities applied currently, as well as with the results of several individual problems and their comparison with the experiment. These methods can be divided into two types: direct numerical simulation methods and phenomenological methods. The first type includes the regular 2D and 3D gasdynamical techniques as well as the techniques based on small perturbation approximation and on incompressible liquid approximation. The second type comprises the techniques based on various phenomenological turbulence models. The second part of the report describes the experimental methods and cites the experimental results of Rayleigh-Taylor and Richtmyer-Meskov instability studies as well as of turbulent mixing. The applied methods were based on thin-film gaseous models, on jelly models and liquid layer models. The research was done for plane and cylindrical …
Date:
December 31, 1994
Creator:
Andronov, V. A.; Zhidov, I. G.; Meskov, E. E.; Nevmerzhitskii, N. V.; Nikiforov, V. V.; Razin, A. N. et al.
System:
The UNT Digital Library
Computational results for parallel unstructured mesh computations
The majority of finite element models in structural engineering are composed of unstructured meshes. These unstructured meshes are often very large and require significant computational resources; hence they are excellent candidates for massively parallel computation. Parallel solution of the sparse matrices that arise from such meshes has been studied heavily, and many good algorithms have been developed. Unfortunately, many of the other aspects of parallel unstructured mesh computation have gone largely ignored. The authors present a set of algorithms that allow the entire unstructured mesh computation process to execute in parallel -- including adaptive mesh refinement, equation reordering, mesh partitioning, and sparse linear system solution. They briefly describe these algorithms and state results regarding their running-time and performance. They then give results from the 512-processor Intel DELTA for a large-scale structural analysis problem. These results demonstrate that the new algorithms are scalable and efficient. The algorithms are able to achieve up to 2.2 gigaflops for this unstructured mesh problem.
Date:
December 31, 1994
Creator:
Jones, M. T. & Plassmann, P. E.
System:
The UNT Digital Library
Computerized accounting methods. Final report
This report summarizes the results of the research performed under the Task Order on computerized accounting methods in a period from 03 August to 31 December 1994. Computerized nuclear material accounting methods are analyzed and evaluated. Selected methods are implemented in a hardware-software complex developed as a prototype of the local network-based CONMIT system. This complex has been put into trial operation for test and evaluation of the selected methods at two selected ``Kurchatov Institute`` Russian Research Center (``KI`` RRC) nuclear facilities. Trial operation is carried out since the beginning of Initial Physical Inventory Taking in these facilities that was performed in November 1994. Operation of CONMIT prototype system was demonstrated in the middle of December 1994. Results of evaluation of CONMIT prototype system features and functioning under real operating conditions are considered. Conclusions are formulated on the ways of further development of computerized nuclear material accounting methods. The most important conclusion is a need to strengthen computer and information security features supported by the operating environment. Security provisions as well as other LANL Client/Server System approaches being developed by Los Alamos National Laboratory are recommended for selection of software and hardware components to be integrated into production version of …
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
Condensed argon isentropic compression with ultrahigh magnetic field pressure: Results of the experiment. Post-shot report
The experiment on solid argon isentropic compression with MC-1 generator ultrahigh magnetic field pressure which was scheduled in VNIIEF-LANL subcontract, has initiated the condensed argon study at megabar pressures. The experiment has recorded the predicted argon compression by more than 5 times that, by the existing concepts, corresponds to 6 Mbar pressure. Thus, the main goals of the experiment were achieved: demonstration of the method`s possibilities and statement of the subsequent study. The isentropic compression device capabilities were shown, the basic characteristics of the isentropic compression and an initial parameters of the experimental facilities and techniques were defined, new information on the changed argon properties at 1 Mbar was obtained.
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
Controlling incipient oxidation of pyrite for improved rejection. Eighth quarterly technical progress report, July 1, 1994--September 30, 1994
The major objectives of this work are (1) to determine the Eh-pH conditions under which pyrite is stable, (2) to determine the mechanism of the initial stages of pyrite oxidation and (3) to determine if the semi-conducting properties of pyrite effects its oxidation behavior. It is known that moderate oxidation of pyrite produces a hydrophobic surface product. This hydrophobic product makes it extremely difficult to depress pyrite in coal flotation circuits. The eventual objective of this work is to prevent pyrite oxidation in order to better depress pyrite in coal flotation circuits. In this work clean, unoxidized pyrite surfaces are being produced by fracturing pyrite electrodes in an electrochemical cell. It has been shown that pyrite assumes a unique potential referred to as the ``stable potential`` at the instance it is fractured and that this potential is several hundred millivolts more negative than the steady state mixed potential of pyrite. It has also been shown that by holding the potential of pyrite at its stable potential during fracture, pyrite undergoes neither oxidation nor reduction. It has also been found that fresh pyrite surfaces created by fracture in an electrochemical begin to oxidize at potentials that are about 200 mV more …
Date:
December 31, 1994
Creator:
Yoon, R. H. & Richardson, P. E.
System:
The UNT Digital Library
Cooperative Research Program in coal liquefaction. Technical report, May 1, 1994--October 31, 1994
Progress reports are presented for the following tasks: coliquefaction of coal with waste materials; catalysts for coal liquefaction to clean transportation fuels; fundamental research in coal liquefaction; and in situ analytical techniques for coal liquefaction and coal liquefaction catalysts.
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
Crystal field and exchange interactions in DyT{sub 4}Al{sub 8} (T = Fe and Mn)
The authors investigated the magnetic excitations in polycrystalline samples of hard magnet related compounds DyFe{sub 4}Al{sub 8} and DyMn{sub 4}Al{sub 8} by neutron spectroscopy. For both compounds the magnetic spectra at energies below 40 meV are dominated by the response of the Dy{sup 3+} ions. In DyMn{sub 4}Al{sub 8} they observed pure crystal-field transitions within the Dy{sup 3+} J = 15/2 ground multiplet ID which is split into 8 doublets under the low point-group symmetry of 4/mmm. In DyFe{sub 4}Al{sub 8} the Dy crystal-field-split states are perturbed by the molecular fields of the ordered Fe sublattice.
Date:
December 31, 1994
Creator:
Loewenhaupt, M.; Tils, P.; Hahn, W. & Loong, C.K.
System:
The UNT Digital Library
Deashing of coal liquids with ceramic membrane microfiltration and diafiltration. Final quarterly technical progress report, October 1--December 31, 1994
Diafiltration experiments were done to determine how much particulate- free oil could be extracted from the solids-containing stream. The 0. 05 {mu}m titania membrane was used for the concentration/diafiltration process runs at 270 C, 80 psig inlet pressure, and 6 gpm crossflow. Five concentration process runs were conducted. After the initial run, the concentrated material was diluted with hydrotreated start-up oil from the final solids back to 10% solids. The concentration was limited by increased pressure drop with increased solids content and plugged membrane module channels. Solids retention was greater than 99.5% for all samples. Attempts to clean membranes with solvent failed due to lack of time. Samples of the permeate and concentrate streams were taken for analysis; the diluent had a similar bp range to the coal liquids in the atmospheric bottoms; thus, distillation could not be used to separate the bottoms from the diluent.
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
Decontamination of Steel by Melt Refining: A Literature Review
It has been reported that a large amount of metal waste is produced annually by nuclear fuel processing and nuclear power plants. These metal wastes are contaminated with radioactive elements, such as uranium and plutonium. Current Department of Energy guidelines require retrievable storage of all metallic wastes containing transuranic elements above a certain level. Because of high cost, it is important to develop an effective decontamination and volume reduction method for low level contaminated metals. It has been shown by some investigators that a melt refining technique can be used for the processing of the contaminated metal wastes. In this process, contaminated metal is melted wit a suitable flux. The radioactive elements are oxidized and transferred to a slag phase. In order to develop a commercial process it is important to have information on the thermodynamics and kinetics of the removal. Therefore, a literature search was carried out to evaluate the available information on the decontamination uranium and transuranic-contaminated plain steel, copper and stainless steel by melt a refining technique. Emphasis was given to the thermodynamics and kinetics of the removal. Data published in the literature indicate that it is possible to reduce the concentration of radioactive elements to a …
Date:
December 31, 1994
Creator:
Ozturk, B. & Fruehan, R. J.
System:
The UNT Digital Library
Defect characterization of electronic conducting pseudo-perovskite systems. Final report
The goal of the program has been to study the interrelationships between electrical conductivity, oxidation-reduction kinetics, defect structure, and composition of n- and p-type binary and ternary transition metal oxides. The stimulus for making these studies was the observation that both conducting n and p type oxides displayed a dependence on oxygen activity that was not predicted by the defect chemistry of their majority defects. The project has focused primarily on the understanding of electronic and ionic conduction in the REBO{sub 3} oxides, where RE is a rare earth ion and B is a transition metal ion. This is being done by studying the interrelationships between the electronic and ionic conductivity, the electronic structure of the B site transition metal ion, and the acceptor concentration. The dependence of these characteristics on the oxygen activity, the temperature, and the defect chemistry of the oxide system is being determined. Theoretical mechanisms and models are being developed from the body of experimental results to provide a predictive tool. The effect of dopants and impurities, processing, electrical and thermal stability as a function of oxygen activity and temperature and their relationship to defect chemistry of the perovskite type oxides have been studied extensively by …
Date:
December 31, 1994
Creator:
Anderson, H. U.; Nasrallah, M.; Sparlin, D. M. & Parris, P. E.
System:
The UNT Digital Library
Demonstration test and evaluation of ultraviolet/ultraviolet catalyzed peroxide oxidation for groundwater remediation at Oak Ridge K-25 Site
In the UItraviolet/Ultraviolet Catalyzed Groundwater Remediation program, W.J. Schafer Associates, Inc. (WJSA) demonstrated, tested and evaluated a new ultraviolet (UV) lamp integrated with an existing commercial technology employing UV catalyzed peroxide oxidation to destroy organics in groundwater at an Oak Ridge K-25 site. The existing commercial technology is the perox-pure{trademark} process of Peroxidation Systems Incorporated (PSI) that employs standard UV lamp technology to catalyze H{sub 2}O{sub 2} into OH radicals, which attack many organic molecules. In comparison to classical technologies for remediation of groundwater contaminated with organics, the perox-pure{trademark} process not only is cost effective but also reduces contaminants to harmless by-products instead of transferring the contaminants from one medium to another (such as in activated carbon or air stripping). Although the perox-pure{trademark} process is cost effective against many organics, it is not effective for some organic contaminants of interest to DOE such as TCA, which has the highest concentration of the organics at the K-25 test site. Contaminants such as TCA are treated more readily by direct photolysis using short wavelength UV light. WJSA has been developing a unique UV lamp which is very efficient in the short UV wavelength region. Consequently, combining this UV lamp with the perox-pure{trademark} …
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library
Department of Energy refurbish power supply/distribution system: Phase 2, Y-12 Plant, Oak Ridge. Project status report No. 40, December 1--31, 1994
A status report on the refurbishing of the power supply and distribution system for the Y-12 Plant is presented. A milestone schedule is included.
Date:
December 31, 1994
Creator:
unknown
System:
The UNT Digital Library