Hydrodynamics of a fluidized bed co-combustor for tobacco waste and coal

Kai Zhang, Bangting Yu, Jian Chang, Guiying Wu, Tengda Wang, Dongsheng Wen

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

The fluidization characteristics of binary mixtures containing tobacco stem (TS) and cation exchange resin (a substitute for coal) were studied in a rectangular bed with the cross-section area of 0.3×0.025m2. The presence of herbaceous biomass particles and their unique properties such as low density and high aspect ratio resulted in different fluidization behaviors. Three fluidization velocities, i.e. initial, minimum and full fluidization velocities, were observed as the TS mass fraction increased from 7% to 20%, and four hydrodynamic stages were experienced, including the static, segregation, transition and mixing stages, with increasing operational gas velocities. The results suggest that the operational gas velocity should be in the range of 2.0-5.0 times of the minimum fluidization velocity of the binary mixtures, and less than 7% TS mass fraction should be used in an existing bubbling fluidized bed. Higher TS fraction inclusion requires the introduction of central jet gas to improve the mixing effect.

Original languageEnglish
Pages (from-to)339-348
Number of pages10
JournalBioresource Technology
Volume119
DOIs
StatePublished - Sep 2012
Externally publishedYes

Keywords

  • Co-combustion
  • Fluidization engineering
  • Herbaceous biomass
  • Mixing behavior
  • Tobacco waste

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