Investigation of the gas inlet velocity distribution in a fixed granular bed filter

Chia Jen Hsu, Shu San Hsiau, Yi Shun Chen, Jiri Smid

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


Granular bed filter (GBF) technology can be applied for high-temperature gas cleanup in integrated gasification combined-cycle (IGCC) and pressurized fluidized-bed combustion (PFBC) advanced coal-fired power plants. The design of the gas inlet component of the granular bed filter is important to achieve a uniform gas distribution and higher usage rate of the filter media. Previous studies show that the gas velocity at the inlet is not uniformly distributed. This non-uniformity may lead to a lower usage rate of the filter media. In this study a baffle device is introduced to the inlet system in order to achieve a more uniform gas velocity distribution. A more uniform gas inlet distribution can be obtained by adjustment of the lengths and angles of the baffles. The gas velocities along the inlet and filtration surfaces are measured using a pitot tube. The uniformity of the gas velocity distribution can be characterized by looking at the distributions of the standard deviation of the gas velocity and the differences in the mean velocities between the two filtration surfaces.

Original languageEnglish
Pages (from-to)614-622
Number of pages9
JournalAdvanced Powder Technology
Issue number6
StatePublished - Nov 2010


  • Baffle device
  • Fixed bed
  • Gas uniformity
  • Granular bed filter
  • Inlet gas velocity distribution


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