Cold model experimental study of a novel multi-regime riser

Jieqing Gan, Hui Zhao, Chunyi Li, Chaohe Yang, Honghong Shan

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2 Citations (Scopus)


A novel circulating fluidized bed riser featured by bottom enlargement and draft tube was investigated on a cold experimental apparatus with a riser of 8.1 m in height and bottom diameter of 120 mm and upper diameter 50 mm. The impact of operation conditions on axial and radial solid holdup and velocity in the novel riser was studied. Solid holdup and particle velocity distributions in the draft tube and the annulus were also investigated. Experimental results showed that, compared with the traditional riser, multi-regime existed in the novel riser with a dense and radially homogeneous bed in bottom part and a dilute phase in upper part. The draft tube was able to redistribute the solid particles coming from the inclined pipe. Huge differences of solid holdup and particle velocity in the draft tube and the annulus were observed. Due to the suction effect of the draft tube, solid particles tended to flow upward from the core region while flowed downward via the annulus in the riser bottom.

Original languageEnglish
Pages (from-to)188-194
Number of pages7
JournalShiyou Xuebao, Shiyou Jiagong/Acta Petrolei Sinica (Petroleum Processing Section)
Issue number2
Publication statusPublished - Apr 2012
Externally publishedYes


  • Circulating fluidized bed
  • Cold model
  • Combined feed
  • Draft tube
  • Maximizing propylene and ethylene (MPE)

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