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A Study on the Effect of Recirculated Exhaust Gas upon Exhaust Emissions of Boiler with a FGR System

FGR 시스템 보일러의 배기 배출물에 미치는 재순환 배기의 영향에 관한 연구

  • 정광호 (경상대학교 대학원 기계설계학과) ;
  • 조용수 ((주) Seen Tec) ;
  • 배명환 (경상대학교 기계항공공학부, 항공기부품기술연구센터)
  • Published : 2007.05.01

Abstract

The effects of recirculated exhaust gas on exhaust emissions under four kinds of nozzle tip with the different fuel consumption rates are experimentally investigated by using an once-through boiler with a FGR system. The purpose of this study is to develop the FGR control system for reducing $NO_x$ emissions in boilers. Intake and exhaust oxygen concentrations, and equivalence ratio are considered to figure out the effect of FGR rate on exhaust emissions at various fuel consumption rates. It is found that $NO_x$ emissions are markedly 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. One can also conclude that the reduction in $NO_x$ emissions is more considerably influenced by the variation of equivalence ratio due to the FGR rate than the fuel consumption rate.

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