Simultaneous measurements of gas-solid flow rates and pressure drop in downcomer of J-valve in CFB

T. Goshima, K. Terasaka

Research output: Contribution to journalArticle


To monitor the gas and solid streams in a downcomer of a J-valve in a CFB, the simultaneous measurement technique using the oxygen gas tracer, the hot particle tracer and the pressure drop was developed. By using this novel measurement technique, the dependence of the solid flow on the gas flow in the moving bed in the downcomer of J-valve was investigated. The pressure profile and the pressure balance in the J-valve as well as the CFB were measured. It was clarified that the circulating mass flux in a CFB or solid flow in a J-valve was governed by the pressure drop in the downcomer of the J-valve. The pressure drop in the downcomer of the J-valve was well estimated using the modified Ergun's equation. To quantitatively control the circulating rate of the solid particles in the CFB, the monitor and tuning of the superficial gas velocity in the downcomer of the J-valve was important.

Original languageEnglish
Pages (from-to)357-363
Number of pages7
JournalChemical and Biochemical Engineering Quarterly
Issue number4
Publication statusPublished - 2007 Dec 1



  • Circulating fluidized bed
  • Flow measurement
  • J-valve
  • Pressure drop
  • Tracer method

ASJC Scopus subject areas

  • Biochemistry
  • Chemistry(all)
  • Process Chemistry and Technology

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