A novel carbon-based process for flue-gas cleanup. Final report

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A low-temperature process employing activated carbon-based catalysts and operating downstream of the electrostatic precipitator (ESP) was evaluated jointly by Research Triangle Institute (RTI) and the University of Waterloo (Waterloo). The RTI-Waterloo process was projected to be capable of removing more than 95% SO{sub 2} and 75% NO{sub x }from coal combustion flue gas. In the process, the flue gas leaving the ESP is first cooled to approximately 100{degree}C. The SO{sub 2} is then catalytically oxidized to SO{sub 3} which is removed as medium-strength sulfuric acid in a series of periodically flushed trickle-bed reactors containing an activated carbon-based catalyst. The SO{sub ... continued below

Physical Description

184 p.

Creation Information

Gangwal, S. K.; Howe, G. B.; McMichael, W. J. & Spivey, J. J. October 1, 1993.

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  • Research Triangle Institute
    Publisher Info: Research Triangle Inst., Research Triangle Park, NC (United States)
    Place of Publication: Research Triangle Park, North Carolina

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Description

A low-temperature process employing activated carbon-based catalysts and operating downstream of the electrostatic precipitator (ESP) was evaluated jointly by Research Triangle Institute (RTI) and the University of Waterloo (Waterloo). The RTI-Waterloo process was projected to be capable of removing more than 95% SO{sub 2} and 75% NO{sub x }from coal combustion flue gas. In the process, the flue gas leaving the ESP is first cooled to approximately 100{degree}C. The SO{sub 2} is then catalytically oxidized to SO{sub 3} which is removed as medium-strength sulfuric acid in a series of periodically flushed trickle-bed reactors containing an activated carbon-based catalyst. The SO{sub 2}-free gas is then reheated to approximately 150{degree}C and NH{sub 3} is injected into the gas stream. It is then passed over a fixed bed of another activated carbon-based catalyst to reduce the NO{sub x} to N{sub 2} and H{sub 2}O. The clean flue gas is then vented to the stack. The feasibility of the process has been demonstrated in laboratory-scale experiments using simulated flue gas. Catalysts have been identified that gave the required performance for SO{sub 2} and NO{sub x} removal with <25 ppM NH{sub 3} slip. Potential for producing up to 10 N sulfuric acid by periodically flushing the SO{sub 2} removal reactor and further concentration to industrial strength 93.17% sulfuric acid was also demonstrated. Using the results of the experimental work, an engineering evaluation was conducted. Cost for the RTI-Waterloo process was competitive with conventional selective catalytic reduction (SCR) -- flue gas desulfurization (FGD) process and other emerging combined SO{sub 2}/NO{sub x} removal processes.

Physical Description

184 p.

Notes

OSTI as DE94003732; Paper copy available at OSTI: phone, 865-576-8401, or email, reports@adonis.osti.gov

Source

  • Other Information: PBD: Oct 1993

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  • Other: DE94003732
  • Report No.: DOE/PC/91345--T9
  • Grant Number: AC22-91PC91345
  • DOI: 10.2172/10106446 | External Link
  • Office of Scientific & Technical Information Report Number: 10106446
  • Archival Resource Key: ark:/67531/metadc1280018

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Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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Creation Date

  • October 1, 1993

Added to The UNT Digital Library

  • Oct. 12, 2018, 6:44 a.m.

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  • Nov. 16, 2018, 6:54 p.m.

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Gangwal, S. K.; Howe, G. B.; McMichael, W. J. & Spivey, J. J. A novel carbon-based process for flue-gas cleanup. Final report, report, October 1, 1993; Research Triangle Park, North Carolina. (https://digital.library.unt.edu/ark:/67531/metadc1280018/: accessed March 21, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.