Asian Journal of Atmospheric Environment

Korean Society for Atmospheric Environment (한국대기환경학회)
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Formation and Dispersion of Nitric Acid Vapor from Stack Flue Gas

  • Park, Mi Jeong (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Wu, Shi Chang (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Jo, Young Min (Department of Environmental Science and Engineering, Kyung Hee University) ;
  • Park, Young Koo (Department of Environmental Engineering, Kangwon National University)
  • Received : 2014.03.25
  • Accepted : 2014.06.02
  • Published : 2014.06.30
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Abstract

Extreme recovery of the thermal energy from the combustion of flue gas may bring about early gas condensation resulting in the increased formation of nitric acid vapor. The behavior of the nitric acid formed inside the stack and in the atmosphere was investigated through a computer-aided simulation in this study. Low temperatures led to high conversion rates of the nitrogen oxide to nitric acid, according to the Arrhenius relationship. Larger acid plumes could be formed with the cooled flue gas at $40^{\circ}C$ than the present exiting gas at $115^{\circ}C$. The acid vapor plume of 0.1 ppm extended to 25 m wide and 200 m high. The wind, which had a seasonal local average of 3 m/s, expanded the influencing area to 170 m along the ground level. Its tail stretched 50 m longer at $40^{\circ}C$ than at $115^{\circ}C$. The emission concentration of the acid vapor in the summer season was a little lower than in the winter. However, a warm atmosphere facilitated the Brownian motion of the discharged flue gas, finally leading to more vigorous dispersion.

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References

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