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포항 지역 대기에서 측정된 에어로졸 입자분포 특성 연구
서문혁,장혁상 한국입자에어로졸학회 2012 Particle and Aerosol Research Vol.8 No.4
Health effects caused by the ultrafine particles in ambient air are great concern to the public health, and the strict measuring and monitoring of the ambient aerosol are required. In this work, the characteristics of the aerosol size distribution in Pohang province are studied. Optical particle counters (Grimm APS 1108 and 1109) were used to measure the aerosol size distribution in the area. Locations near the national monitoring site located in the industrial and the residence area were selected for the measuring sites of this study, and the locations in border area between the industry and the residence were selected for the reference of the comparison. In the industry site, it is found that the concentration of aerosol particles near the size of 5㎛ appear characteristically and the fluctuations in concentration with respect to time are minimal. The mass concentration of the aerosol above 10 ㎛ in diameter in the industry area was found to fluctuate significantly. The mass portion of PM10 and PM2.5 to TSP in the residence area were 83% and 51% respectively. In the industrial regional, it was found that the mass portion of PM10 and PM2.5 to TSP were 76% and 35% respectively. In the boundary area the mass portion of PM10 and PM2.5 to TSP were 78% and 54% respectively.
SCR 시스템의 효율적인 운영을 위한 Soot Blowing 방법에 대한 해석적 연구
서문혁,장혁상 한국입자에어로졸학회 2012 Particle and Aerosol Research Vol.8 No.3
In the SCR (selective catalytic reduction) system which is used for controlling the NOx emission from the Diesel engines, the soot deposited on the catalysis causes degradation of the system performance. Numerical study was done to evaluate the performance of soot blower which is proposed as a method for removing the soot on the catalysis. The spray conditions and the effect of the compressed air from the AIG (air inlet gun) were analyzed numerically to evaluate the overall effective method of the soot blowing. The characteristics of the final velocity distribution and velocity waves across the inlet section of the catalysis were evaluated with respect to the geometries of the AIG outlets and pressure conditions. An experimental model was used to validate the results of the numerical calculation that is used for finding the effective removal blowing momentum transfer quantities of soot the inlet section of the catalysis, and it is proposed that the required minimum blowing momentum transfer quantities are over than 0.499 khgh/m.teff. in the current study.
국제해사기구 Tier 3 규제 대응을 위한 선박용 컴팩트 배연탈질 촉매 모듈화 기술개발
구윤장,김남경,이진우,황해든,서문혁,최용기,박대원,임동하 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.0
국제해사기구에 의해 선박에서 배출되는 유해가스에 대한 해양환경규제 강화로 인해 선박 배기가스 내 포함된 NOx 배출 규제가 Tier I 대비 80% 이상의 배출 저감을 요구하는 Tier III 규제가 발효되었다. 강화된 Tier III 기준을 만족시키기 위해 선박용 배연탈질 후처리 기술인 선택적촉매환원법(Selective Catalyst Reduction, SCR)을 적용하고 있다. 특히, 본 연구에서는 한정된 선박의 배기가스 배출공간을 고려하여 기존 허니컴 형태의 세라믹 지지체 형태가 아닌 넓은 비표면적을 가지는 특수 형상의 지지체를 이용하여 고가의 활성금속을 소량 사용하여도 촉매 활성 및 열적 안정성을 극대화함과 동시에 컴팩트하고 모듈화된 배연탈질 시스템을 개발하고자 한다. 특수 형상의 지지체 및 활성금속 담지 최적 제조 조건을 확립하고, 이에 대한 배연탈질 성능을 비교·평가하였다. 신개념의 배연탈질 촉매 최적화 기술을 통해 배연탈질 반응기 컴팩트화 및 설치/유지보수가 용이함에 따라 Capex 및 Opex 비용 저감을 극대화할 수 있다.