• Title/Summary/Keyword: 2단 연소용 공기

Search Result 4, Processing Time 0.019 seconds

The Effect of Supply Patterns of Overfire Air on Generation of NOX and CO in a Wood pellet Fired Boiler (우드펠릿 보일러에서 2단 연소용 공기 공급방식이 질소산화물 및 일산화탄소 발생에 미치는 영향)

  • Jung, Kwang-sung;Yoo, Hoseon
    • Plant Journal
    • /
    • v.15 no.3
    • /
    • pp.35-41
    • /
    • 2019
  • In this study, we investigated the effect of the generation of NOx and CO by adjusting the overfire air supply position and ratio using the boiler that was converted from coal burning to wood pellet boiler. When the amount of the overfire air is relatively increased, the amount of NOx is slightly decreased but CO is sharply decreased when burning at low excess air ratio (1.10) that is due to a small fuel particle size. However, NOx slightly increased when burning at high excess air ratio (1.33) due to the large fuel size, but CO was hardly affected. Also, When the amount of overfire air was same, The more supply position was concentrated to upper portion of the main combustor, the more NOx and CO was lowered. And in case of the excess air ratio was high, the generation of NOx and CO I can see that it keeps the level irrelevant to the amount of air for the second stage combustion.

A Study on Effect of Recirculated Exhaust Gas upon Performance and Exhaust Emissions in a Power Plant Boiler with FGR System (FGR 시스템 동력 플랜트 보일러의 성능 및 배기 배출물에 미치는 재순환 배기의 영향에 관한 연구)

  • Bae, Myung-whan;Jung, Kwong-ho;Park, Sung-bum
    • Transactions of the Korean Society of Mechanical Engineers B
    • /
    • v.40 no.4
    • /
    • pp.263-273
    • /
    • 2016
  • The effect of recirculated exhaust gas on performance and exhaust emissions with FGR rate are investigated by using a natural circulation, pressurized draft and water tube boiler with FGR system operating at several boiler loads and over fire air damper openings. The purpose of this study is to apply the FGR system to a power plant boiler for reducing $NO_x$ emissions. To activate the combustion, the OFA with 0 to 20% is supplied into the flame. When the suction damper of two stage combustion system installed in the upper side of wind box is opened by handling the lever between $0^{\circ}$ and $90^{\circ}$, also, the combustion air supplied to burner is changed. It is found that the fuel consumption rate per evaporation rate did not show an obvious tendency to increase or decrease with rising the FGR rate, and $NO_x$ emissions at the same OFA damper opening are decreased, as FGR rates are elevated and boiler loads are dropped. While a trace amount of soot is emitted without regard to the operation conditions of boiler load, OFA damper opening and FGR rate, because soot emissions are eliminated by the electrostatic precipitator with a collecting efficiency of 86.7%.

Study on Operating Characteristics for NOx Reduction in Ultra Low NOx Burner Combustion Using 80 kW Furnace (80 kW 초 저 NOx 단일 버너 연소로에서 NOx 감소를 위한 운전특성 연구)

  • Chae, Taeyoung
    • Clean Technology
    • /
    • v.26 no.3
    • /
    • pp.211-220
    • /
    • 2020
  • This experimental study investigates the design parameters to achieve ultra low NOx combustion of coal using a 80 kW capacity single-burner furnace. The influence of key design parameters such as SN, overall and burner-zone equivalence ratios, primary/secondary air ratio, overfire air (OFA) ratio were tested for a total of 81 cases. The results showed that weak swirl intensity of the burner leads to higher NOx emission whereas strong swirl intensity accompanies increased CO concentration desipte lower NOx emission. Therefore, finding an appropirate swirl intensity is essential for the burner design. Larger flow rate of secondary air increased NOx emission, whereas smaller flow rate stretches the flame and increased CO emission. The lowest NOx emission of 82 ppm (6% O2) was achieved at the optimal condition of the present burner deisgn. It is expected to furrther lower the NOx emission by introducing splitting the burner secondary air into three or four streams.

Effect of Recirculated Exhaust Gas upon Performance and Exhaust Emissions in Power Plant Boilers with FGR System (FGR 시스템 공력 플랜트 보일러의 성능 및 배기 배출물에 미치는 재순환 배기의 영향)

  • Bae, Myung-Whan;Jung, Kwong-Ho;Choi, Seung-Chul;Cho, Yong-Soo;Kim, Yi-Suk
    • Proceedings of the KSME Conference
    • /
    • 2004.11a
    • /
    • pp.1686-1691
    • /
    • 2004
  • The effect of recirculated exhaust gas on performance and exhaust emissions with FGR rate are investigated by using a natural circulation, pressurized draft and water tube boiler with FGR system operating at several boiler loads and over fire air(OFA) damper openings. The purpose of this study is to apply the FGR system to a power plant boiler for reducing $NO_{x}$ emissions. To activate the combustion, the suction damper of two stage combustion system installed in the upper side of wind box is opened by handling the lever between $0^{\circ}$ and $90^{\circ}$ , and the OFA with 0 to 20% into the flame is supplied, as the combustion air supplied to burner is reduced. It is found that the fuel consumption rate divided by evaporation rate does not show an obvious tendency to increase or decrease with rising the FOR rate, and $NO_{x}$ emissions are decreased, at the same OF A damper opening, as FOR rates are elevated and boiler loads are dropped.

  • PDF