Effect of Recirculated Exhaust Gas on Exhaust Emissions of Boiler with FGR System

FGR 시스템 보일러의 배기 배출물에 미치는 재순환 배기의 영향

  • 배명환 (경상대학교 기계항공공학부) ;
  • 김정민 (경상대학교 대학원 기계설계학과) ;
  • 김이석 ((주) Seen Tec) ;
  • 조용수 ((주) Seen Tec) ;
  • 최승철 (경상대학교 대학원 기계설계학과)
  • Published : 2003.11.05


The effect of recirculated exhaust gas on exhaust emissions under four kinds of nozzle tip with the different fuel consumption rate are experimentally investigated by using an once-through boiler with FGR system. The purpose of this study is to develop the FGR control system for reducing NOx in a boiler. Intake and exhaust oxygen concentrations, and equivalence ratio are applied to discuss the effect of FGR rate on exhaust emissions at various fuel consumption rates. It is found that NOx emissions are decreased, while soot emissions are increased owing to the drop of intake and exhaust oxygen concentrations, and the rise of equivalence ratio as FGR rates are elevated.