• 제목/요약/키워드: Boiler Combustion System

검색결과 93건 처리시간 0.021초

보일러 내부 고온가스에 노출된 전열 튜브에서의 열유속 평가 방법 (Estimation method of heat flux at tube bank exposed to high temperature flue gas in large scale coal fired boilers)

  • 정재진;송정일
    • 한국태양에너지학회:학술대회논문집
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    • 한국태양에너지학회 2009년도 추계학술발표대회 논문집
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    • pp.259-264
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    • 2009
  • Most of the fossil power plants firing lower grade coals are challenged with maintaining good combustion conditions while maximizing generation and minimizing emissions. In many cases significant derate, availability losses and increase in unburned carbon levels can be attributed to poor combustion conditions as a result of poorly controlled local fuel and air distribution within the boiler furnace. The poor combustion conditions are directly related to the gas flow deviation in upper furnace and convection tube-bank but a less reported issue related to in large-scale oppose wall fired boilers. In order to develop a on-line combustion monitoring system and suggest an alternative heat flux estimation method at tube bank, which is very useful information for boiler design tool and blower optimizing system, field test was conducted at operating power boiler. During the field test the exhaust gases' temperature and tube metal temperature were monitored by using a spatially distributed sensors grid which located in the boiler's high temperature vestibule region. At these locations. the flue gas flow is still significantly stratified, and air in-leakage is minimal which enables tracing of poor combustion zones to specific burners and over-fire air ports. Test results showed that the flue gas monitoring method is more proper than metal temperature distribution monitoring for real time combustion monitoring because tube metal temp. distribution monitoring method is related to so many variables such as flue gas, internal flow unbalance, spray etc., Heat flux estimation at the tube bank with flue gas temp. and metal temp. data can be alternative method when tube drilling type sensor can't able to use.

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보일러 Windbox내 공기공급 계통의 유량분포 해석 (Analysis of Air Distribution in the Windbox System of the Utility Boiler)

  • 박호영;김성철
    • 설비공학논문집
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    • 제20권9호
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    • pp.581-589
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    • 2008
  • The pulverized coal combustion behavior in the utility boiler is very complex since so many physical and chemical processes happen in it, simultaneously. The mixing of pulverized coal with combustion air plays an important role in achieving the efficient combustion and stable boiler operation. The distribution of combustion air supplied to the furnace through the windbox damper system has not been clearly known since the individual measurements of air flow for each air nozzle were not possible, yet. The present study describes the CFD modelling of windbox damper system and aims to obtain the air flow rates and pressure loss coefficients across the present five damper systems, respectively. The one dimensional flow network model has been also established to get air flow distributions across the windbox damper, and applied to the actual plant operation condition. Compared with the designed air flow distribution, the modelled one gives a reasonable agreement. For the actual plant operation, the predicted air flow distribution at each air nozzle is differed with the designed data and strongly affected by the individual opening angle.

100 MWe급 순산소연소 발전소 보일러계통 공정설계 및 운전변수 민감도 예측 (100 MWe Oxyfuel Power Plant Boiler System Process Design and Operation Parameters Sensitivity Analysis)

  • 백세현;고성호
    • 한국연소학회지
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    • 제18권4호
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    • pp.1-11
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    • 2013
  • The oxy-fuel combustion is $CO_2$ capture technology that uses mixture of pure $O_2$ and recirculated exhaust as oxidizer. Currently some Oxy-fuel power plants demonstration project is underway in worldwide. Meanwhile research project for converting 125 MWe Young-Dong power plant to 100 MWe oxy-fuel power plants is progress. In this paper, 1 D process analytical approach was applied for conducting process design and operating parameters sensitivity analysis for oxy-fuel combustion of Young-Dong power plant. As a result, appropriate gas recirculation rates was 74.3% that in order to maintain normal rating superheater, reheater steam temperature and boiler heat transfer patterns. And boiler efficiency 85.0%, CPU inlet $CO_2$ mole concentration 71.34% was predicted for retrofitted boiler. The oxygen concentration in the secondary recycle gas is predicted as 27.1%. Meanwhile the oxygen concentration 22.4% and moisture concentration 5.3% predicted for primary recycle gas. As the primary and secondary gas recirculation increases, then heat absorption of the reheater is tends to increases whereas superheater side is decreased, and also the efficiency is tends to decrease, according to results of sensitivity analysis for operating parameters. In addition, the ambient air ingression have a tendency to lead to decline of efficiency for boiler as well as decline of $CO_2$ purity of CPU inlet.

가스보일러 배기시스템 설치 기준 분석 및 개발 (가스보일러 배기시스템 관련 설치 안전기준 개발II) (Analysis and Development for Installation Safety Standard on Gas Boiler Exhaust System)

  • 이수정;최경석;채충근;김하나;윤진선
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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    • pp.111-112
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    • 2014
  • Exhaust gas boiler system with respect to national and international safety standards, comparative study best suited to the realities of local exhaust and exhaust system manufacturing, certification standards and gas boiler installation, management, and mip draft inspection standards will proceed through this study.

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초임계 오일 연소 보일러의 동특성 예측 연구 - 650MWe급 화력발전소의 Load Runback 모사 (Dynamic performance prediction of a Supercritical oil firing boiler - Load Runback simulation in a 650MWe thermal power plant)

  • 양종인;김정래
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2014년도 제49회 KOSCO SYMPOSIUM 초록집
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    • pp.19-20
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    • 2014
  • Boiler design should be desinged to maximize thermal efficiency of the system under imposed load requirement and a boiler should be validated for transient operation. If a proper prediction is possible on the transient behavior and transient characteristics of a boiler, one may asses the performance of boiler component, control logics and operation procedures. In this work, dynamic modeling method of boiler is presented and dynamic simulation of load runback scenario was carried out on suprecritical oil-firing boiler.

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340MWe급 순환 유동상 보일러의 단순 성능 예측 모형 (Performance Prediction Model of 340MWe Circulating Fluidized Bed Boiler)

  • 양종인;최상민
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2012년도 제45회 KOSCO SYMPOSIUM 초록집
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    • pp.119-122
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    • 2012
  • Circulating fluided bed(CFB) furnace which can use a variety of low-grade fuels because of high heat capacity and good mixing characteristic in its furnace have turned out to be effective system. There is no many research to predict performance considering total boiler system with water-steam side. Most of performance prediction model have focused on hydrodynamics or chemical mechanism in furnace. so, This study is aimed to develop performance prediction model which consider water-steam side.

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열분석을 통한 열전용 보일러동 실내배관의 동파 가능성 예측 (Prediction of Possibility of Indoor Pipe Freezing in Heat Only Boiler Room through Thermal Analysis)

  • 임병익;정광섭;김영일
    • 한국지열·수열에너지학회논문집
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    • 제8권3호
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    • pp.19-28
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    • 2012
  • In a heat only boiler system of a steam power plant, outdoor air required for combustion is made to pass through indoor space for increasing the boiler efficiency. Due to heat generated by various equipments, temperature of the air that enters the boiler will increase resulting in combustion efficiency. If the outdoor air temperature is low, however, this will cause freezing and bursting of pipes which are filled with water. It is especially fatal to small diameter pipes and pipes connected to measuring instruments. The purpose of this study is find operation and outdoor conditions where this phenomena can happen and also establish preventive measures to avoid this problem.

응축수 순환이 폐열회수 응축형 보일러 성능에 미치는 영향 (Effect of Waste Heat Recovery Condensing Boiler with Condensed Water Recirculation Function)

  • 금국빈;김수익;유병훈;이창언
    • 한국연소학회:학술대회논문집
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    • 한국연소학회 2015년도 제51회 KOSCO SYMPOSIUM 초록집
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    • pp.201-204
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    • 2015
  • Recently, energy excessive consumption and environmental pollution are the social issued. The most efficient way to solve both energy excessive consumption and environmental pollution is existing combustion system improved. This study was part of the assume and commercial used existing waste heat recovery condensing boiler to low emission performance for exhaust gas recirculation(EGR) and thermal efficiency rise by applying the condensed water recirculation(CWR) conducted. The researchers applied the EGR and CWR develop a new concept for the condensed water recirculation waste heat recovery condensing boiler. Waste heat recovery condensing boiler applied to the condensed water recirculation thermal efficiency of the same conditions was increased by about 4.8~5.5% and pollution emission also decreased.

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평판형 예혼합 버너의 다양한 화염면 매질 및 열교환기에 따른 연소 특성 (A Study on the Combustion Characteristics of Flat-Plate Premixed Burner for Various Flame Surface Media and Heat Exchangers)

  • 조은성;박창권;최경석
    • 대한기계학회논문집B
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    • 제35권10호
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    • pp.1033-1040
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    • 2011
  • 예혼합 버너는 높은 효율과 낮은 배기 때문에 가정용 보일러 버너 시스템에 매우 강력한 버너이다. 일반적으로 가정용 보일러 버너는 내부에 농후한 예혼합 불꽃으로 구성하고 연료는 2차공기의 공급에 의하여 완전연소 되는 분젠 버너를 이용한다. 이것은 상대적으로 긴 불꽃 길이와 높은 과잉공기비에서 작동하기 때문에 높은 효율을 갖는 소형 보일러에 적용하기 어렵다. 이 논문에서 메탈 화이버, 세라믹, SUS 핀과 같은 매질을 사용하는 예혼합 연소 버너의 특징을 실험하였다. 특히, 표면 매질의 비반응 유동 특성은 버너 표면 전체의 유동 속도를 측정하고 조정하였다. 연소 실험은 화염 사진과 화염 온도 측정에 의하여 수행되었다. CO와 NO는 다양한 과잉 공기비와 열량값에 대하여 버너 표면 매질, 연소실, 열교환기의 특성을 측정하고 평가하였다.