Abstract:
The pilot-scale simultaneous NO/sub x/ and SO/sub x/ removal from boiler emission was performed using an indirect plasma and a chemical hybrid process. The flue gas flow ...Show MoreMetadata
Abstract:
The pilot-scale simultaneous NO/sub x/ and SO/sub x/ removal from boiler emission was performed using an indirect plasma and a chemical hybrid process. The flue gas flow rate was in the range of 450-1,470 Nm/sup 3//hr, the gas temperature of 280 /spl deg/C, and NO/sub x/ concentration of 30 ppm for city gas firing, and 70 ppm of NO/sub x/ and 35 ppm of SO/sub x/ for heavy oil firing, respectively. The radical injection by the indirect plasma was demonstrated to be extremely effective for NO oxidation especially when the flue gas temperature is in the range of 300 /spl deg/C where NO/sub x/ is generated at this temperature. The produced NO/sub 2/ was further reduced to N/sub 2/ and nontoxic and water soluble Na/sub 2/SO/sub 4/ by Na/sub 2/SO/sub 3/ chemical scrubber. For the case of oil firing boiler SO/sub 2/ was simultaneously adsorbed by NaOH solution. The NO/sub x/ removal efficiency for gas firing exceeds 90% but NO/sub x/ removal efficiency for oil firing was in the range of 60% due to the lack of ozone concentration with the present pulse power supply. The removal efficiency of SO/sub 2/ was in the range of 85-90% The NO/sub x/ removal efficiency was evaluated by the ratio of the radical flow rate by the indirect plasma to the primary flue gas flow rate, specific energy density, and Na/sub 2/SO/sub 3/ concentration and chemical flow rate. Finally, the quality of disposed water was investigated and proved to be disposable.
Published in: Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005.
Date of Conference: 02-06 October 2005
Date Added to IEEE Xplore: 24 October 2005
Print ISBN:0-7803-9208-6
Print ISSN: 0197-2618