Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)

The Korean Society of Mechanical Engineers (대한기계학회)
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Combustion Characteristics of Premixed Burner for Domestic Condensing Gas Boiler Using Metal Fiber and Throttle Body

Metal Fiber와 Throttle Body를 적용한 가정용 응축보일러용 예혼합 버너의 연소특성

  • Lee, Pil Hyong (Division of Mechanical System Engineering, Incheon Nat'l Univ.) ;
  • Hwang, Sang Soon (Division of Mechanical System Engineering, Incheon Nat'l Univ.)
  • 이필형 (인천대학교 기계시스템공학부) ;
  • 황상순 (인천대학교 기계시스템공학부)
  • Received : 2016.09.28
  • Accepted : 2017.01.08
  • Published : 2017.04.01
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Abstract

Premixed combustion has many advantages, including low CO and NOx emissions and a small combustor volume. These characteristics allow a compact design and wide application to condensing boilers with high thermal efficiencies. This study focused on the combustion characteristics in a premixed combustion burner using metal fiber and a throttle body. The results showed that a blue flame was found to be very stable at a heating load of 6,250-25,000 kcal/h when implementing the proper metal fiber, baffle plate, and throttle body. The NOx emission was less than 11 ppm under an equivalence ratio of 0.724-0.795, and the CO emission was less than 50 ppm under the same equivalence ratio. The thermal efficiency, which is a very important index when condensing a gas boiler, was observed to be above 96.3％ under an equivalence ratio of 0.750.

예혼합연소의 경우 연소시스템의 크기가 작고, 낮은 CO 및 NOx 배출 등의 많은 장점을 가지고 있어 고효율 저공해 가정용 응축보일러에 많이 적용되고 있다. 본 연구에서는 Metal Fiber와 Throttle Body를 적용하여 예혼합 연소시스템을 구성하여 연소특성을 분석하였다. 실험결과 Metal Fiber, Throttle Body 및 Baffle Plate의 조합을 통하여 열용량 6,250-25,000 kcal/h 조건에서 매우 안정적인 청염을 형성하였다. 배기가스의 경우 질소산화물은 당량비 0.724에서 0.795 조건에서 11 ppm 이하로 배출되었고 일산화탄소의 경우 동일 당량비 조건에서 50 ppm 이하로 배출되었다. 가정용 응축보일러의 중요 지표인 열효율의 경우 당량비 0.750 조건에서 96.3% 이상으로 측정되어 고효율 저공해 예혼합 연소시스템의 가능성을 확인하였다.

Keywords

References

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