화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.12, No.5, 533-541, August, 2001
Export Citation
단계적 연소에 의한 NO(x) 환원 및 저감 특성
Characteristics of NO(x) Reduction in Two Staged Combustion
한웅†, 양현수, 박주식1, 최상일1
  • 충남대학교 정밀공업화학과, 대전 305-764
  • 1한국에너지기술연구원, 대전 305-343
Woong Hahn†, Hyun Soo Yang, Chu Sik Park1, and Sang Il Choi1
  • Department of Fine Chemicals Engineering & Chemistry, Chungnam National University, Taejon 305-764, Korea
  • 1Korea Institute of Energy Research, Taejon 305-343, Korea
E-mail:
초록
NO(x)의 생성은 석탄의 형태와 등급, 석탄에 함유되어 있는 휘발분, 고온 연소과정에서 생성되는 휘발분 및 질소 성분 그리고 연소를 위해 공급되는 과잉산소의 양에 따라 영향을 받는다. NO(x)의 생성은 연소과정에서 공기비가 화학양론비보다 높은 경우 공기와 석탄의 빠른 반응에 의해 이루어진다. 또한 NO(x) 생성은 휘발분이 증가함에 따라 감소하였다. 연소과정에서 석탄에 함유되어 있는 질소 성분이 촤보다 휘발분에 많이 함유되어 있는 경우 NO(x) 생성이 감소하게 된다. NO(x)의 저감은 석탄에 함유된 휘발분, 연소과정에서 생성된 휘발성분과 질소성분의 증가 그리고 낮은 공기비에서 이루어진다. 특히, 연소초기 화염영역에서 연료가 농후한 조건과 높은 반응온도인 경우 효과적으로 NO(x)의 환원이 이루어진다. 단계적 연소를 적용한 NO(x) 저감은 연소 초기조건에서 저공기비로 유지하고 이후 완전연소를 위해 추가적인 공기를 공급하는 방식을 도입함으로서 효과적으로 NO(x)를 저감하였다.
Formation of nitrogen oxides(NO(x)) in a combustion system is found to be strongly dependent on the grade, different types of coals, content of fuel-bound nitrogen, volatile content, nitrogeneous species content produced from pulverized coal flame and excess O2 content for complete combustion. At a high stoichiometric ratio for combustion, NO(x) is produced by fast mixing of air and fuel. In this case, NO(x) concentration decreases with increase of volatile content. Contersion of Volatile-N to NO(x) will be subsequently higher than Char-N to NO(x). NO(x) emission decreased with decreased of air ratio, increase of volatile content contained in raw coal, and increase volatile matter content and nitrogeneous content produced to high temperature in coal compustion. In particular, an effective NO(x)reduction was achieved at a high temperature and fuel rich condition during the onset of combustion. Thus, a staged combustion for reduction of NO(x) is achieved with ample supply of air following low air radd during the initial stage of combustion.
Keywords:NO(x);coal combustion;formation;reduction;staged combustion
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