Journal of Korean Society of Environmental Engineers (대한환경공학회지)

Korean Society of Environmental Engineers (대한환경공학회)
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The Study on the Realtime Evaluation of NH3 Absorption Efficiency Using Chemical Gas Sensor

가스센서를 활용한 암모니아 가스의 실시간 흡수 효율 평가에 관한 연구

  • Lim, Jung-Jin (Department of Environmental Engineering, Daejeon University) ;
  • Kim, Han-Soo (Department of Environmental Engineering, Daejeon University) ;
  • Kim, Sun-Tae (Department of Environmental Engineering, Daejeon University)
  • Received : 2012.07.28
  • Accepted : 2013.03.18
  • Published : 2013.04.30
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Abstract

This study was carried out to develop the realtime evaluation system of $NH_3$ absorption efficiency with gas sensors which were installed on the inlet and outlet of lab-scale scrubber system. The $NH_3$ absorption amount, calculated by sensor outcomes for 3 hr, 6 hr, and 12 hr of absorption process, was compared with the results analysed by Indo-phenol method for the absorption solution. Even though the difference between two methods was about 20%, the correlation coefficient between the two results was very high, more than 0.99. In addition, we could find very good correlation between pH, absorption amount and reaction time. Also we could find out the breakthrough time in the middle of absorption process. With more diverse experiment in the future, we can make gas sensor system for the realtime evaluation of the odor and/or air pollution treatment efficiency.

본 연구에서는 실험실 규모의 스크러버 전단과 후단에 설치된 가스센서의 출력값으로부터 흡수제의 실시간 흡수효율을 평가하기 위한 연구를 진행하였다. 스크러버 전단과 후단에 설치된 가스센서는 센서표면에서의 가스 흡 탈착반응으로 발생되는 전기적인 변화를 출력신호로 나타내는 측정장치이며, 스크러버의 흡수제와 암모니아 가스와의 반응시간(3시간, 6시간 및 12시간)에 따른 암모니아 가스의 흡수량을 산출하였다. 또한 가스센서의 출력값으로부터 산출된 암모니아 흡수량을 기존의 암모니아 분석방법인 인도페놀법에 의한 흡수량 산정방법과 비교해 보았으며, 약 20%의 차이를 보이긴 하나 0.99 이상의 높은 상관성을 보이고 있음을 확인하였다. 또한, 반응시간에 따른 pH와 흡수량과의 높은 상관성을 확인할 수 있었으며, 흡수제에 대한 암모니아 흡수량을 실시간으로 파악함으로써 흡수제의 파과시간을 예측할 수 있었다. 향후 다양한 연구를 통하여 악취배출시설의 스크러버에 이와 같은 가스센서를 적용하여 흡수제의 흡수 효율을 실시간으로 평가하여 교체주기 및 효율 등을 실시간으로 평가할 수 있는 시스템으로 발전이 가능함을 확인하였다.

Keywords

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