High in-bed heat transfer and low corrosive environment imply that the loop seal of a circulating fluidized bed (CFB) boiler is an advantageous location for superheaters. In order to increase the knowledge on the flow pattern and the heat transfer distribution to the tubes within a loop seal, measurements were performed in the loop seal of a CFB boiler as well as in a scaled-down seal operated according to simplified scaling laws. The scale model measurements show that the solids recirculation flux can be maintained with a substantial decrease of the fluidization flow in the seal compared to that currently used at full load conditions. It was also possible to significantly decrease the fraction of the bottom of the seal that was fluidized without affecting the solids flux through the seal. A gradient in the solids flow were detected in the vertical direction.
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June 2006
Research Papers
The Performance of a Loop Seal in a CFB Boiler
Andreas Johansson
Andreas Johansson has received his B.Sc, M.Sc, in electrical engineering in the University College of Borås, Sweden, 1998, 2000, respectively. In 2005 he achieved his Ph.D. degree in the field of energy conversion. The title of the dissertation was Solids Flow Pattern in Circulating Fluidized-bed Boilers. Today he is employed at the Swedish national testing and research institute (SP) and the University College of Borås.
Andreas Johansson
Department of Energy Conversion,
Chalmers University of Technology
, SE-412 96 Göteborg, Sweden and University College of Borås
, SE-501 90 Borås, Sweden
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Filip Johnsson
Filip Johnsson is Professor of Sustainable Energy Systems at Chalmers University of Technology. He has extensive experience in technically oriented research into thermal power production, with focus on biomass conversion and CO2 capture technologies. Filip Johnsson has published more than 50 scientific papers in peer reviewed international journals and conferences and won best-paper awards. He also performs and lead research on sustainable energy systems, with emphasis on infrastructural changes of the energy system. Filip Johnsson is a coordinator within the Alliance for Global Sustainability (AGS), which is an interdisciplinary oriented alliance between Chalmers, Tokyo University, ETH in Zurich and MIT.
Filip Johnsson
Department of Energy Conversion,
Chalmers University of Technology
, SE-412 96 Göteborg, Sweden
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Bengt-Åke Andersson
Bengt-Åke Andersson works at Kvaerner Power as Product engineer for Power Boilers and is responsible for R&D on fuel, ash and primary emissions. He has more than of experience from combustion of solid fuels in fluidised bed boilers and around 40 publications in international scientific journals and conference proceedings. Most of them on heat transfer, fluid dynamics and combustion of solid fuels in fluidised bed boilers. In 1989 he received his Ph.D. degree at Chalmers University of Technology and in 1992 he became an Associate Professor. Today he is an Adjunct Professor at the University College of Borås.
Bengt-Åke Andersson
University College of Borås
, SE-501 90 Borås, Sweden; Kvaerner Power AB
, SE-402 75 Göteborg, Sweden
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Andreas Johansson
Andreas Johansson has received his B.Sc, M.Sc, in electrical engineering in the University College of Borås, Sweden, 1998, 2000, respectively. In 2005 he achieved his Ph.D. degree in the field of energy conversion. The title of the dissertation was Solids Flow Pattern in Circulating Fluidized-bed Boilers. Today he is employed at the Swedish national testing and research institute (SP) and the University College of Borås.
Filip Johnsson
Filip Johnsson is Professor of Sustainable Energy Systems at Chalmers University of Technology. He has extensive experience in technically oriented research into thermal power production, with focus on biomass conversion and CO2 capture technologies. Filip Johnsson has published more than 50 scientific papers in peer reviewed international journals and conferences and won best-paper awards. He also performs and lead research on sustainable energy systems, with emphasis on infrastructural changes of the energy system. Filip Johnsson is a coordinator within the Alliance for Global Sustainability (AGS), which is an interdisciplinary oriented alliance between Chalmers, Tokyo University, ETH in Zurich and MIT.
Bengt-Åke Andersson
Bengt-Åke Andersson works at Kvaerner Power as Product engineer for Power Boilers and is responsible for R&D on fuel, ash and primary emissions. He has more than of experience from combustion of solid fuels in fluidised bed boilers and around 40 publications in international scientific journals and conference proceedings. Most of them on heat transfer, fluid dynamics and combustion of solid fuels in fluidised bed boilers. In 1989 he received his Ph.D. degree at Chalmers University of Technology and in 1992 he became an Associate Professor. Today he is an Adjunct Professor at the University College of Borås.
J. Energy Resour. Technol. Jun 2006, 128(2): 135-142 (8 pages)
Published Online: January 31, 2006
Article history
Received:
June 11, 2004
Revised:
January 31, 2006
