A novel carbon-based process for flue gas cleanup

Technical Report · Wed Jul 01 00:00:00 EDT 1992

DOI:https://doi.org/10.2172/7022721· OSTI ID:7022721

Gangwal, S K ^[1]; Silveston, P L ^[2]

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1. Research Triangle Inst., Research Triangle Park, NC (United States)
2. Waterloo Univ., ON (Canada)

The objective of this project is to demonstrate the preliminary technical and economic feasibility of a novel carbon-based process for removal of at least 95% SO{sub 2} and at least 75% NO{sub x} from coal combustion flue gas. In the process, flue gas leaving the electrostatic precipitator (ESP) is passed through a trickle bed of activated carbon catalyst employing a periodic flush of low strength sulfuric acid. The SO{sub 2} is oxidized to SO{sub 3} and removed as medium strength sulfuric acid. The SO{sub 2}-free flue gas is then mixed with NH{sub 3}, and the NO{sub x} in the gas is subjected to selective catalytic reduction (SCR) to N{sub 2} over a fixed bed of activated carbon catalyst. In the previous three quarters, a detailed project management plan was prepared describing the experimental setup, work plan, and test plan. The experimental system was completed for SO{sub 2} conversion at Waterloo and for NO{sub x} conversion at RTI. Shakedown experiments were completed. In the present quarter, the NO{sub x} removal performance of two additional modified carbon catalysts (MCCII and MCCIII) was studied. MCCII showed NO{sub x} removal efficiency which was similar to that observed for MCCI. However, MCCI was considerably less active for NO{sub x} removal. SO{sub 2} removal experiments with NO present in the feed gas were performed with MCCI. SO{sub 2} removal efficiency was consistently about 98% over each of 10 cycles and was very similar to that observed earlier with no NO present in the feed. Finally, a preliminary economic evaluation of the process was performed and a project review meeting was held. The economic evaluation showed that the Rn-Waterloo process was competitive with SCR/IFGD and other combined SO{sub 2}/NO{sub x}, removal processes.

• Research Organization: Research Triangle Inst., Research Triangle Park, NC (United States)
• Sponsoring Organization: USDOE; USDOE, Washington, DC (United States)
• DOE Contract Number: AC22-91PC91345
• OSTI ID: 7022721
• Report Number(s): DOE/PC/91345-T6; ON: DE92040656
• Country of Publication: United States
• Language: English

Related Subjects

20 FOSSIL-FUELED POWER PLANTS
ACTIVATED CARBON
CATALYTIC EFFECTS
FLUE GAS
DENITRIFICATION
DESULFURIZATION
SULFUR DIOXIDE
OXIDATION
ELECTROSTATIC PRECIPITATORS
PLANNING
PROGRESS REPORT
SELECTIVE CATALYTIC REDUCTION
SULFUR TRIOXIDE
ADSORBENTS
CARBON
CHALCOGENIDES
CHEMICAL REACTIONS
DOCUMENT TYPES
ELEMENTS
EQUIPMENT
GASEOUS WASTES
NONMETALS
OXIDES
OXYGEN COMPOUNDS
POLLUTION CONTROL EQUIPMENT
REDUCTION
SULFUR COMPOUNDS
SULFUR OXIDES
WASTES
200202* - Fossil-Fueled Power Plants- Waste Management- Noxious Gas & Particulate Emissions