Support studies for the U-GAS coal gasification process. Part I: Fluidization |
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| Affiliation: | 1. Key Laboratory of Subsurface Hydrology and Ecological Effect in Arid Regions (Chang''an University), Ministry of Education, Xi''an 710054, China;2. School of Environmental Science and Engineering, Chang''an University, Xi''an 710054, China;3. State Key Laboratory of Coastal and Offshore Engineering, Dalian University of Technology, Dalian 116024, China;4. School of Water Conservancy and Civil Engineering, Northeast Agricultural University, No. 59, Mucai Street, Harbin 150030, China;5. School of Water Conservancy and Hydro-power, Heilongjiang University, Harbin 150086, China;1. Department of Civil and Environmental Engineering, The Pennsylvania State University, 3127 Research Drive, State College, PA 16801, USA;2. Department of Civil and Environmental Engineering, The Pennsylvania State University, 231M Sackett Building, University Park, PA 16802, USA;1. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin 150001, China;2. Department of Mechanical and Aerospace Engineering, Center of Excellence for Advanced Materials, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0416, USA;3. Department of Mechanical Engineering, University of Massachusetts, Lowell, One University Avenue, Lowell, MA 01854, USA |
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| Abstract: | This is the first part of a series of papers providing the details of support studies conducted as part of the development of the U-GAS fluidized-bed ash-agglomerating coal gasification process. The fluidized-bed gasifier in the U-GAS process behaves much like a conventional well-mixed bed, having a uniform bed composition and temperature in the bulk of the region, but it exhibits some departure in a small localized area confined to the proximity of the central spout, where a somewhat higher temperature is maintained for producing ash agglomerates. Extensive cold-flow experimental studies have been conducted to predict the solids discharge rates and agglomerates classification from the venturi/classifier system in the gasifier; these studies have resulted in a generalized analytical expression in terms of operating velocities, gas properties, and venturi/classifier configuration for the gasifier scale-up.Large-scale U-GAS gasifiers can have single-cone or multiple-cone grid configurations. X-ray cinematographic studies have been conducted in a program at University College London to compare the fluidization behaviors in the one-cone and three-cone grid configuration systems. The objective of this test program was to visually examine the solids circulation and study the bubble dynamics in the fluidized beds with these different configurations. |
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