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Hot-Gas Filter Testing with a Transport Reactor Gasifier

Description: Today, coal supplies over 55% of the electricity consumed in the United States and will continue to do so well into the next century. One of the technologies being developed for advanced electric power generation is an integrated gasification combined cycle (IGCC) system that converts coal to a combustible gas, cleans the gas of pollutants, and combusts the gas in a gas turbine to generate electricity. The hot exhaust from the gas turbine is used to produce steam to generate more electricity fr… more
Date: September 18, 2002
Creator: Swanson, M. L. & Hajicek, D. R.
Partner: UNT Libraries Government Documents Department
open access

Improving Efficiency of a Counter-Current Flow Moving Bed Granular Filter

Description: The goal of this research is to improve the performance of moving bed granular filters for gas cleaning at high temperatures and pressures. A second goal of the research is to optimize the performances of both solids and gas filtering processes through appropriate use of granular bed materials, particle sizes, feed rates etc. in a factorial study. These goals are directed toward applications of advanced coal-fired power cycles under development by the U.S. Department of Energy including pressur… more
Date: September 18, 2002
Creator: Colver, G.M.; Brown, R.C.; Shi, H. & Soo, D.S-C.
Partner: UNT Libraries Government Documents Department
open access

Novel Backup Filter Device for Candle Filters

Description: The currently preferred means of particulate removal from process or combustion gas generated by advanced coal-based power production processes is filtration with candle filters. However, candle filters have not shown the requisite reliability to be commercially viable for hot gas clean up for either integrated gasifier combined cycle (IGCC) or pressurized fluid bed combustion (PFBC) processes. Even a single candle failure can lead to unacceptable ash breakthrough, which can result in (a) damag… more
Date: September 18, 2002
Creator: Bishop, B.; Goldsmith, R.; Dunham, G. & Henderson, A.
Partner: UNT Libraries Government Documents Department
open access

On the development of life prediction methodologies for the failure of human teeth

Description: Human dentin is known to be susceptible to failure under cyclic loading. Surprisingly, there are few reports that quantify the effect of such loading, considering the fact that a typical tooth experiences a million or so loading cycles annually. In the present study, a systematic investigation is described of the effects of prolonged cyclic loading on human dentin in a simulated physiological environment. In vitro stress-life (S/N) data are discussed in the context of possible mechanisms of fat… more
Date: September 18, 2002
Creator: Nalla, R. K.; Imbeni, V.; Kinney, J. H.; Marshall, S. J. & Ritchie, R. O.
Partner: UNT Libraries Government Documents Department
open access

Operation Behavior of a Multi-Candle Filter with Coupled Pressure Pulse Recleaning during Normal Operation and in the Case of a Filter Candle Failure

Description: A pilot filter with the CPP recleaning system was installed and commissioned during the first half year of 2000 in ''PYDRA'', the pyrolytic rotary tube facility of the Institute for Technical Chemistry, Research Center Karlsruhe. The filter, with a rated throughput of 50 std.m{sup 3}/h, is equipped with two clusters of three filter candles each (DIA-SCHUMALITH{reg_sign} T 10-20, 1 = 1500 mm), and has been designed for a maximum operating temperature of 550 C. After commissioning, the filter was… more
Date: September 18, 2002
Creator: Mai, R.; Leibold, H. Seifert, H.; Heidenreich, S. & Haag, W.
Partner: UNT Libraries Government Documents Department
open access

Possible triaxial superdeformation in {sup 174}Hf.

Description: Three, possibly four, regularly spaced rotational bands with large dynamical moments of inertia, which are consistent with known superdeformed bands in the Lu/Hf region, have been identified in {sup 174}Hf. The states were populated in the {sup 130}Te({sup 48}Ca,4n) reaction at a beam energy of 194 MeV. The Gammasphere array detected the emitted gamma radiation. Ultimate cranker calculations predict substantial triaxial deformation ({gamma} {approx} {+-} 17{sup o}) for highly deformed {sup 174}… more
Date: September 18, 2002
Creator: Hartley, D. J.; Djongolov, M.; Riedinger, L. L.; Kondev, F. G.; Janssens, R. V. F.; Abu Saleem, K. et al.
Partner: UNT Libraries Government Documents Department
open access

Power Systems Development Facility: High Temperature, High Pressure Filtration in Gasification Operation

Description: High temperature, high pressure gas filtration is a fundamental component of several advanced coal-fired power systems. This paper discusses the hot-gas filter vessel operation in coal gasification mode at the Power Systems Development Facility (PSDF). The PSDF, near Wilsonville, Alabama, is funded by the U.S. Department of Energy (DOE), Southern Company, and other industrial participants currently including the Electric Power Research Institute, Siemens Westinghouse Power Corporation, Kellogg … more
Date: September 18, 2002
Creator: Martin, R.A.; Guan, X.; Gardner, B. & Hendrix, H.
Partner: UNT Libraries Government Documents Department
open access

Preparation of Metal Filter Element for Fail Safety in IGCC Filter Unit

Description: Metal filter elements as the fail safety filter are fabricated by the methods using cold isostatic pressure (compress method) and binder (binder method) to form the filter element and tested in a experimental and bench units. The fail safety filter on the filtration system is mounted additionally in order to intercept the particle leak when the main filter element is broken. So it should have two contrary functions of a high permeability and being plugged easily. The filter element having high … more
Date: September 18, 2002
Creator: Choi, J-H.; Ahn, I-S.; Bak, Y-C.; Bae, S-Y.; Ha, S-J. & Jang, H-J.
Partner: UNT Libraries Government Documents Department
open access

SCHUMACHER HOT GAS FILTER LONG-TERM OPERATING EXPERIENCE in the NUON POWER BUGGENUM IGCC POWER PLANT

Description: Coal is a main source of primary energy for power generation and it will remain indispensable in the future. In order to increase the efficiency and to meet environmental challenges new advanced coal-fired power systems were developed starting in the beginning of the 1990s. One of these efficient and clean technologies is the Integrated Gasification Combined Cycle (IGCC) process.
Date: September 18, 2002
Creator: Scheibner, B. & Wolters, C.
Partner: UNT Libraries Government Documents Department
open access

A Simple Candle Filter Safeguard Device

Description: In order to reach the highest possible efficiencies in a coal-fired turbine-based power system, the turbine should be directly fired with the products of coal utilization. Two main designs employ these turbines: those based on pressurized fluidized-bed combustors (PFBCs) and those based on integrated gasification combined cycles (IGCCs). In both designs, the suspended particulates, or dust, must be cleaned from the gas before it enters the turbine to prevent fouling and erosion of the blades. T… more
Date: September 18, 2002
Creator: Hurley, J. P.; Henderson, A. K. & Swanson, M. L.
Partner: UNT Libraries Government Documents Department
open access

Advanced Adaptive Optics Technology Development

Description: The NSF Center for Adaptive Optics (CfAO) is supporting research on advanced adaptive optics technologies. CfAO research activities include development and characterization of micro-electro-mechanical systems (MEMS) deformable mirror (DM) technology, as well as development and characterization of high-resolution adaptive optics systems using liquid crystal (LC) spatial light modulator (SLM) technology. This paper presents an overview of the CfAO advanced adaptive optics technology development a… more
Date: September 18, 2001
Creator: Olivier, S.
Partner: UNT Libraries Government Documents Department
open access

Geographic Information Systems in Support of Wind Energy Activities at NREL: Preprint

Description: The National Renewable Energy Laboratory (NREL) uses Geographic Information Systems (GIS) to further the development of wind energy resources in support of the U.S. Department of Energy (DOE) Wind Energy Program and its Wind Powering America Initiative. Some of the elements of NREL's GIS data used in wind energy activities include wind measurement sites, transmission lines, federal facility information, and modeled wind resources. More complex GIS analyses can define relationships among the map… more
Date: September 18, 2001
Creator: Heimiller, D. M. & Haymes, S. R.
Partner: UNT Libraries Government Documents Department
open access

Numerical Solution of Natural Convection in Eccentric Annuli

Description: The governing equations for transient natural convection in eccentric annular space are solved with two high-order accurate numerical algorithms. The equation set is transformed into bipolar coordinates and split into two one-dimensional equations: finite elements are used in the direction normal to the cylinder surfaces; the pseudospectral technique is used in the azimuthal direction. This report discusses those equations.
Date: September 18, 2001
Creator: Pepper, D.W.
Partner: UNT Libraries Government Documents Department
open access

Optimization-based Method for Automated Road Network Extraction

Description: Automated road information extraction has significant applicability in transportation. It provides a means for creating, maintaining, and updating transportation network databases that are needed for purposes ranging from traffic management to automated vehicle navigation and guidance. This paper is to review literature on the subject of road extraction and to describe a study of an optimization-based method for automated road network extraction.
Date: September 18, 2001
Creator: Xiong, D
Partner: UNT Libraries Government Documents Department
open access

Sliding Window Technique for Calculating System LOLP Contributions of Wind Power Plants

Description: Conventional electric power generation models do not typically recognize the probabilistic nature of the power variations from wind plants. Most models allow for an accurate hourly representation of wind power output, but do not incorporate any probabilistic assessment of whether the given level of wind power will vary from its expected value. The technique presented in this paper uses this variation to calculate an effective forced-outage rate for wind power plants (EFORW). Depending on the ty… more
Date: September 18, 2001
Creator: Milligan, M. R.
Partner: UNT Libraries Government Documents Department
open access

Spectral Scales in the Atmospheric Boundary Layer

Description: Wind measurements from the Savannah River Laboratory - WJBF-TV tower in Beech Island SC were used to compute turbulence parameters which were then compared with similarity theory predictions summarized by Hanna (1981A). This report discusses those findings.
Date: September 18, 2001
Creator: Weber, A. H.
Partner: UNT Libraries Government Documents Department
open access

Status of Avian Research at the National Renewable Energy Laboratory

Description: As the use of wind energy expands across the United States, concerns about the impacts of commercial wind farms on bird and bat populations are frequently raised. Two primary areas of concern are (1) possible litigation resulting from the killing of even one bird if it is protected by the Migratory Bird Treaty Act, the Endangered Species Act, or both; and (2) the effect of avian mortality on bird populations. To properly address these concerns, the U.S. Department of Energy's National Renewable… more
Date: September 18, 2001
Creator: Sinclair, K.
Partner: UNT Libraries Government Documents Department
open access

The Accelerated Site Technology Deployment Program/Segmented Gate System Project

Description: The Department of Energy (DOE) is working to accelerate the acceptance and application of innovative technologies that improve the way the nation manages its environmental remediation problems. The DOE Office of Science and Technology established the Accelerated Site Technology Deployment Program (ASTD) to help accelerate the acceptance and implementation of new and innovative soil and ground water remediation technologies. Coordinated by the Department of Energy's Idaho Office, the ASTD Progra… more
Date: September 18, 2000
Creator: PATTESON,RAYMOND
Partner: UNT Libraries Government Documents Department
open access

Coscheduling Technique for Symmetric Multiprocessor Clusters

Description: Coscheduling is essential for obtaining good performance in a time-shared symmetric multiprocessor (SMP) cluster environment. However, the most common technique, gang scheduling, has limitations such as poor scalability and vulnerability to faults mainly due to explicit synchronization between its components. A decentralized approach called dynamic coscheduling (DCS) has been shown to be effective for network of workstations (NOW), but this technique is not suitable for the workloads on a very … more
Date: September 18, 2000
Creator: Yoo, A. B. & Jette, M. A.
Partner: UNT Libraries Government Documents Department
open access

Effect of an Under-Dense Plasma Density Gradient on the Backstreaming Ion Mechanism

Description: The space charge limited emission of ions from a target in the focus of an intense relativistic electron beam is studied analytically for the case of a spatially varying target density profile. In particular, the emission in the presence of an under-dense plasma shelf in contact with the solid density target dramatically differs from the case of an abrupt solid-vacuum boundary. It is found that an under-dense gradient scale length several times that of the beam radius at the focus reduces the e… more
Date: September 18, 2000
Creator: Caporaso, G J
Partner: UNT Libraries Government Documents Department
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