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Heat Transfer in FB-Boilers

pages 211-232
DOI: 10.1615/ICHMT.1986.AdvCourseFluidBedComb.80
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  • Introduction
    • FB-boilers show heat transfer mechanisms quite different from the usual in boiler engineering. In conventional fossil fuel steam generation the physical mechanisms of heat transfer are restricted to radiation and gas-convection. In FB-boilers other mechanisms occur and not all in these mechanisms is fully understood yet. Empirical data on heat transfer to surfaces in fluid beds are scarce when compared to the vast number of data available for design and calculation of transfer area In conventional steam generation. Not only the in-bed heat transfer differs appreciably from the usual, also the transfer processes in and after the freeboard are quite unconventional due to much lower gas-temperature, low gas-velocities and a heavy dust load.
      Designers of FB-steam generating systems need design data and procedures to handle these data. This asks for understanding of the physical mechanisms controlling heat transfer in this type of steam generator. This is the main purpose of the following lectures. Part of the data and theories given can be found in literature; to some detail work is presented that has not been published before. This work is based on bench-scale and pilot-plant scale research in the Twente University of Technology, in the authors’ laboratory by G.H. Huisman, T.J. de Jong, A. van Manen and B. Pasma. The author acknowledges their input and is grateful for permission to make use of their work.
  • General Outlines of FB Heat Transfer
  • Survey of Heat Transfer Mechanisms to Embedded Surfaces in Fluid Beds for Steam Generation
  • Instationary Heat Transfer Models: Particle Convection
  • Correlations in Dimensionless Form for FB Heat Transfer
  • Description of Pilot Plant Facility and Results of Measurements

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