Waste and Biomass Valorization

, Volume 10, Issue 11, pp 3457–3470 | Cite as

Bed Particle Agglomeration and Defluidization in the Rubber Wood and Coir-Fired Fluidized Bed

  • Pawin ChaivatamasetEmail author
  • Suvit Tia
  • Waraporn Methaviriyasilp
  • Wittaya Pumisampran
Original Paper


The behaviors of the bed particle agglomeration and the bed defluidization during the fluidized bed combustion of the rubber wood and the coir were experimentally studied. This work focused on (1) the effects of the bed operating variables on the bed agglomeration tendency and (2) the behaviors of the fuel inorganic elements and the governing mechanisms associated the bed agglomeration. During the combustion, the fluidized bed underwent the defluidization from partial to complete by the growth of the bed particles and the accumulation of the agglomerates. The fuel composition was the significant effect. The defluidization was promoted by the increasing bed temperature and bed particle size, and the decreasing air velocity. The morphological and chemical analyses revealed that the molten K-silicates formed via the reactions between the fuel’s potassium and silicon of the bed particle contributed towards the bed agglomeration. The migration of the inorganic compounds from the fuel particle to the bed particle was likely dominated by the deposition of the released gaseous/aerosol inorganic species. The thermodynamic examination corroborated that the K–Si adhesive materials which presented as the liquid phase at the observed bed conditions caused the agglomeration. The large melt fractions in the materials were shown.


Fluidized bed combustion Bed agglomeration Defluidization Rubber wood Coir 



The financial support from National Research Council of Thailand (NRCT) is gratefully acknowledged. The author is also appreciative to Southern Biofuel Co. Ltd for the valuable help in the rubber woodchip sample. The support in the laboratory scale operation given by the staffs of Technical and Engineering System (TCS), Pilot plant Development and Training Institute (PDTI) during the experiments is gratefully appreciated.


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© Springer Science+Business Media B.V., part of Springer Nature 2018

Authors and Affiliations

  1. 1.Combustion Technology, Pilot Plant Development and Training InstituteKing Mongkut’s University of Technology ThonburiBangkokThailand
  2. 2.Department of Chemical EngineeringKing Mongkut’s University of Technology ThonburiBangkokThailand
  3. 3.Technical and Engineering System, Pilot Plant Development and Training InstituteKing Mongkut’s University of Technology ThonburiBangkokThailand

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