A regenerable sorbent injection/filtration process for H{sub 2}S removal from hot gas

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The operational characteristics of a hot gas desulfurization process involving regenerable sorbent injection and its subsequent collection with a ceramic filtration device were studied utilizing a bench-scale transport reactor. Hydrogen sulfide removal from simulated hot gas was evaluated as a function of both zinc oxide-based sorbent physical and chemical characteristics and various process parameters. In addition, the sorbent capture efficiency and regenerability of the ceramic filtration device were evaluated, and regeneration of sulfided sorbents via injection into an oxidizing gas was studied. For both sorbent sulfidation and spent sorbent regeneration, gas-solid reaction occurred both in the duct and within layers ... continued below

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6 p.

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Higgins, R.J.; Ji, W.; Connors, M.J.; Jones, J.F. & Goldsmith, R.L. December 31, 1996.

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Description

The operational characteristics of a hot gas desulfurization process involving regenerable sorbent injection and its subsequent collection with a ceramic filtration device were studied utilizing a bench-scale transport reactor. Hydrogen sulfide removal from simulated hot gas was evaluated as a function of both zinc oxide-based sorbent physical and chemical characteristics and various process parameters. In addition, the sorbent capture efficiency and regenerability of the ceramic filtration device were evaluated, and regeneration of sulfided sorbents via injection into an oxidizing gas was studied. For both sorbent sulfidation and spent sorbent regeneration, gas-solid reaction occurred both in the duct and within layers of partially reacted sorbent captured by the ceramic filter. Very high sulfur removal efficiencies were obtained only in highly reducing hot gas compositions at or above about 700 C, using stoichiometric ratio (defined as ZnO/H{sub 2}S ratio) values of about 1.5, and sorbent particles of about 20 {micro}m or less in diameter. Under such conditions, the experimental data indicated that reaction of H{sub 2}S with zinc vapor formed by reduction of zinc oxide contributed appreciably to sulfur removal. Negligible zinc loss from the hot zone of the reactor was detected, apparently due to rapid formation of zinc sulfide product layers on zinc oxide particles. The ceramic filtration devices captured 100% of all sorbent particles and were fully regenerable over periods of several tens of injection/backpulse cleaning cycles. Spent sorbent could be fully regenerated rapidly at 850 C without problems due to exotherm generation.

Physical Description

6 p.

Notes

OSTI as DE97003449

Medium: P; Size: 6 p.

Source

  • 13. annual international Pittsburgh coal conference, Pittsburgh, PA (United States), 3-7 Sep 1996

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  • Other: DE97003449
  • Report No.: DOE/ER/81364--8
  • Report No.: CONF-960954--8
  • Grant Number: FG02-92ER81364
  • DOI: 10.2172/446320 | External Link
  • Office of Scientific & Technical Information Report Number: 446320
  • Archival Resource Key: ark:/67531/metadc675653

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  • December 31, 1996

Added to The UNT Digital Library

  • July 25, 2015, 2:21 a.m.

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  • April 13, 2017, 12:42 p.m.

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Higgins, R.J.; Ji, W.; Connors, M.J.; Jones, J.F. & Goldsmith, R.L. A regenerable sorbent injection/filtration process for H{sub 2}S removal from hot gas, report, December 31, 1996; United States. (digital.library.unt.edu/ark:/67531/metadc675653/: accessed April 24, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.