A bench-scale fluidized bed combustor with a novel fluidizing gas injection manifold was successfully built for characterization of Australian black coals under PFBC conditions. Instead of the usual horizontal distributor plate to support the bed and distribute the fluidizing gas, the fluidizing gas was injected horizontally through 8 radial ports in the cylindrical wall of the combustor. To verify satisfactory hydrodynamic performance with the novel gas injection manifold, the fluidization was directly investigated by measuring differential pressure fluctuations under both ambient and PFBC conditions. In addition, a Perspex cold model was built to simulate the hydrodynamics of the hot bed in the PFBC facility. Under PFBC conditions, the bed operated in a stable bubbling regime and the solids were well mixed. The bubbles in the bed were effectively cloudless and no gas backmixing or slugging occurred; so the gas flow in the bed could be modeled by assuming two phases with plug flow through each phase. The ratio of for the simulated bed to for the hot PFBC bed matched the conditions proposed by Glicksman’s scaling laws. The bubbles rose along the bed with axial and lateral movements, and erupted from the bed surface evenly and randomly at different locations. Two patterns of particle movement were observed in the cold model bed: a circular pattern near the top section and a rising and falling pattern dominating in the lower section.
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e-mail: John.Stubington@unsw.edu.au
e-mail: Jiangang.Xu@student.unsw.edu.au
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June 2006
Research Papers
Hydrodynamic Performance of a Novel Design of Pressurized Fluidized Bed Combustor
Alan L. T. Wang,
Alan L. T. Wang
Dr. Alan L.T. Wang received his B.Eng. and M.Eng. from Northeast Electric Power University and Beijing Energy Research Institute, China, respectively, in the late 1980s. After working for 3 years as a Design Engineer for Newcastle Engineering, Australia, in 1996, he joined the School of Chemical Engineering, University of NSW where he received his Ph.D. in 2000 by researching coal combustion and worked at the same school until 2002 on coal research and lectured Process Safety and Risk Assessment for 2 years. He has been working for Foster Wheeler since the end of 2002 on design safety and risk management.
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John F. Stubington,
John F. Stubington
Co-operative Research Centre for Coal in Sustainable Development and School of Chemical Engineering and Industrial Chemistry,
e-mail: John.Stubington@unsw.edu.au
University of New South Wales
, UNSW, Sydney 2052, Australia
Associate Professor John F. Stubington was born in Brisbane Australia. He received his bachelor’s degree in Chemical Engineering (First Class Honors and University Medal) from the University of Queensland in 1970 and received his Ph.D. from the University of Cambridge, England in 1974. After 3 years working in the glass industry with ACI in Sydney, he returned to academia with the Department of Chemical Engineering at RMIT in Melbourne and, for the last 26 years, with the School of Chemical Engineering at the University of New South Wales in Syndey. He is now Associate Professor at the University of New South Wales, researching the areas of fluidized bed combustion (FBC) and advanced power generation systems. He has specialized in coal devolatilization and volatiles combustion in FBC and now in coal performance in pressurized FBC.
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Jiangang Xu
Jiangang Xu
Co-operative Research Centre for Coal in Sustainable Development and School of Chemical Engineering and Industrial Chemistry,
e-mail: Jiangang.Xu@student.unsw.edu.au
University of New South Wales
, UNSW, Sydney 2052, Australia
Jiangang Xu received his B.Eng. and M.Eng. in Chemical Engineering from China University of Mining and Technology in 1987 and 1990. He worked as a mineral processing engineer at Inner Mongolia Coal Industry Bureau, China until 1998. He obtained is M. Eng. from the University Technology, Sydney Australia in 2000. Currently, he is pursuing his Ph.D. at the University of New South Wales, Syndey Australia. His research is on Pressurized Fluidized Bed Combustion.
Search for other works by this author on:
Alan L. T. Wang
Dr. Alan L.T. Wang received his B.Eng. and M.Eng. from Northeast Electric Power University and Beijing Energy Research Institute, China, respectively, in the late 1980s. After working for 3 years as a Design Engineer for Newcastle Engineering, Australia, in 1996, he joined the School of Chemical Engineering, University of NSW where he received his Ph.D. in 2000 by researching coal combustion and worked at the same school until 2002 on coal research and lectured Process Safety and Risk Assessment for 2 years. He has been working for Foster Wheeler since the end of 2002 on design safety and risk management.
John F. Stubington
Associate Professor John F. Stubington was born in Brisbane Australia. He received his bachelor’s degree in Chemical Engineering (First Class Honors and University Medal) from the University of Queensland in 1970 and received his Ph.D. from the University of Cambridge, England in 1974. After 3 years working in the glass industry with ACI in Sydney, he returned to academia with the Department of Chemical Engineering at RMIT in Melbourne and, for the last 26 years, with the School of Chemical Engineering at the University of New South Wales in Syndey. He is now Associate Professor at the University of New South Wales, researching the areas of fluidized bed combustion (FBC) and advanced power generation systems. He has specialized in coal devolatilization and volatiles combustion in FBC and now in coal performance in pressurized FBC.
Co-operative Research Centre for Coal in Sustainable Development and School of Chemical Engineering and Industrial Chemistry,
University of New South Wales
, UNSW, Sydney 2052, Australiae-mail: John.Stubington@unsw.edu.au
Jiangang Xu
Jiangang Xu received his B.Eng. and M.Eng. in Chemical Engineering from China University of Mining and Technology in 1987 and 1990. He worked as a mineral processing engineer at Inner Mongolia Coal Industry Bureau, China until 1998. He obtained is M. Eng. from the University Technology, Sydney Australia in 2000. Currently, he is pursuing his Ph.D. at the University of New South Wales, Syndey Australia. His research is on Pressurized Fluidized Bed Combustion.
Co-operative Research Centre for Coal in Sustainable Development and School of Chemical Engineering and Industrial Chemistry,
University of New South Wales
, UNSW, Sydney 2052, Australiae-mail: Jiangang.Xu@student.unsw.edu.au
J. Energy Resour. Technol. Jun 2006, 128(2): 111-117 (7 pages)
Published Online: June 3, 2005
Article history
Received:
June 15, 2004
Revised:
June 3, 2005
Citation
Wang, A. L. T., Stubington, J. F., and Xu, J. (June 3, 2005). "Hydrodynamic Performance of a Novel Design of Pressurized Fluidized Bed Combustor." ASME. J. Energy Resour. Technol. June 2006; 128(2): 111–117. https://doi.org/10.1115/1.2126987
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