Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Comparison of Combustion Characteristics With and Without Water Tube Simulating Heat Exchanger in Two Sections Porous Media Burner

2단 다공성 매체버너에서 열교환기를 모사한 수관 유무에 따른 연소 특성 비교

  • Lee, Hui-Do (Department of Aerospace Engineering, Sunchon National University) ;
  • Kim, Jae-Hyeon (Department of Aerospace Engineering, Sunchon National University) ;
  • Lee, Kee-Man (School of Mechanical and Aerospace Engineering, Sunchon National University)
  • 이희도 (순천대학교 우주항공공학과) ;
  • 김재현 (순천대학교 우주항공공학과) ;
  • 이기만 (순천대학교 기계우주항공공학부)
  • Received : 2019.09.09
  • Accepted : 2019.10.24
  • Published : 2019.10.31
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Abstract

In this study, the experimental studies were conducted to analyzing characteristics of combustion and flame stabilizing according to with and without water tube in boiler. The burner has consisted of SiC foam where has the location of submerged flame between a ceramic board acting as flash-back arrestor. Porous burner is also insulated to minimize heat loss in the radial direction. In the condition of fixed equivalence ratio, the flame mode was divided into three stability zones by the flow rate. The main factor for blow-off and flash-back depends on mixture flow rate. Consequently, the case of burner with water-tube has higher NOx emissions than without case. This result explains that the presence of water-tube makes the heat loss resistant to ambient temperature with increasing of NOx. This tendency was proved by predicting the relationship between O2 emission and NO production rate, and by analysing temperature profiles.

본 연구에서는 수관식 보일러의 열교환기를 모사하기 위하여 수관의 존재 유무에 따른 화염의 안정화와 연소 특성을 당량비와 유속에 따라 비교하였다. 버너는 화염이 존재하는 SiC foam과 역화 방지를 위한 세라믹 보드, 균일한 유동장을 형성하는 알루미나 볼로 구성되며, 반경 반향의 열 손실을 최소화하기 위하여 단열재로 밀폐되어 있다. 결과적으로 수관이 존재하는 경우 낮은 당량비 구간에서 역화 및 날림 현상의 경계가 넓어지는 것을 안정화 영역에서 확인할 수 있었다. 또한, 수관이 존재하는 경우 NOx 배출량이 수관이 없는 경우보다 증가하는 것을 확인하였다. 이는 수관이 존재함으로써 열 손실을 억제하여 화염의 온도가 증가하는 것으로 판단하였으며, O2 배출량과 화염의 온도를 예측하여 입증하였다.

Keywords

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