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Sintering Behavior of Coal Ash Build Up on Ceramic Filters in a Hot Gas Filtration System

[+] Author Affiliations
Yoshihiko Ninomiya, Atsushi Sato

Chubu University, Kasugai, Aichi, Japan

Paper No. FBC2003-127, pp. 69-76; 8 pages
doi:10.1115/FBC2003-127
From:
  • 17th International Conference on Fluidized Bed Combustion
  • 17th International Conference on Fluidized Bed Combustion
  • Jacksonville, Florida, USA, May 18–21, 2003
  • Conference Sponsors: Advanced Energy Systems
  • ISBN: 0-7918-3680-0 | eISBN: 0-7918-3675-4
  • Copyright © 2003 by ASME

abstract

To understand agglomeration phenomena of ash particles in a hot gas ceramic filter system, actual tests were carried out on candle filters with a 4MWth pressurized internally circulating fluidized bed boiler (PICFB) pilot plant. Coal ashes build up on the ceramic filters were analyzed by computer controlled scanning electron microscopy (CCSEM) and thermomechanical analyzer (TMA). The dust cake taken at 750°C did not show any sign of bridging or cleaning difficulty, while those at 950°C showed some difficulty in cleaning because of ash bridging between the adjacent ceramic filters. The initial deformation temperatures of the non-bridge dust were about 750 to 800°C. The index of R2 O/(Al2 O3 +SiO2 ) (R2 O = Na2 O or K2 O) for the non-bridge dust cake showed in the range of 1 to 25wt%, and the particle size of the potassium rich particles was in the range of 0.5 to 2.2μm. However, the index for the bridge cake approached to below 5% and the particle size of the potassium rich particles shifted to the larger range of 2.2 to 10μm. It was observed that weak sintering takes place by the reaction of potassium rich particles and the ash particles that adjoins the particles.

Copyright © 2003 by ASME

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