• Title/Summary/Keyword: 코너 연소

Search Result 13, Processing Time 0.024 seconds

Numerical studies of the oxygen and air combustion performance in a Corner-type coal fired boiler (발전용 코너 보일러의 순산소 및 공기연소 화로해석)

  • Lee, Incheol;Jang, Seokwon
    • 한국신재생에너지학회:학술대회논문집
    • /
    • 2010.11a
    • /
    • pp.198.2-198.2
    • /
    • 2010
  • Three dimensional numerical analysis of the oxygen and air were performed to investigate the combustion characteristics in a Corner-type pulverized coal boiler. With the actual operation data of the power plant, the distribution of velocity, gas temperature, $O^2$, $CO_2$, $H_2O$, $N_2$ as well as the particle tracking in the boiler were investigated. The predicted values at the outlet of furnace for the gas temperature and major species concentrations gave a good agreement with the designed values. The present analysis on combustion characteristics in a boiler would provide the useful information for the stable boiler operation and in trouble shooting boiler problem.

  • PDF

Dissipation and Control of Flow Instability in a Rectangular Swirl Combustor using Cooling Flow Injection (사각 스월 연소기에서 냉각 유동을 이용한 연소기 내 유동 불안정 감쇠 및 조종)

  • Yoo, Kwang-Hee;Kim, Jong-Chan;Sung, Hong-Gye
    • Proceedings of the Korean Society of Propulsion Engineers Conference
    • /
    • 2009.11a
    • /
    • pp.236-241
    • /
    • 2009
  • To identify turbulent flow characteristics of non-reacting case resulted from cooling flow injection in a rectangular swirl combustor, 3D Large Eddy Simulation(LES) was implemented and Proper Orthogonal Decomposition(POD) analysis was used for post-processing. The combustor of concern is the LM6000, lean premixed dry low-NOx annular combustor, developed by GEAE. It was observed that increase in speed of shear layer resulted from the inflow of cooling flow caused intensified vorticity magnitude in central toroidal recirculation zone. In the case of vorticity magnitude in corner recirculation zone, however, was weakened. In addition, pressure fluctuation in combustor was damped down and longitudinal acoustic mode was significantly dissipated

  • PDF

Turbulent Combustion Characteristics of a Swirl Injector in a Gas Turbine Annular Combustor Using LES and Level-set Flamelet (LES와 Level-set Flamelet 기법을 이용한 가스터빈 환형 연소기용 스월 분사기의 난류 연소 특성)

  • Kim, Lina;Hong, Ji-Seok;Jeong, Won Cheol;Yoo, Kwang-Hee;Kim, Jong-Chan;Sung, Hong-Gye
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.18 no.2
    • /
    • pp.1-9
    • /
    • 2014
  • To investigate the flame dynamics in an annular combustor with single swirl injector, a 3D large-eddy simulation (LES) and a level-set flamelet turbulent combustion model have been implemented. The LM6000 developed by GEAE has been used as the combustor of concern and boundary conditions are based on experimental data. The strong central toroidal recirculation zone induced by the volume expansion of the combustion gas and the vortex breakdown continuously occurred through the procession of the vortex with decreasing strength, are observed.

NOx Emission Characteristics Depending on the Variations in Yaw Angle of the Secondary Air Nozzles in a Coal Fired Boiler (연소용 이차공기 수평분사각에 따른 질소산화물(NOx) 배출특성)

  • Kim, Young-Joo;Park, Ho-Young;Lee, Sung-No
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.31 no.4
    • /
    • pp.272-277
    • /
    • 2009
  • Three dimensional numerical analysis for the coal fired boiler has been performed to investigate the effect of yaw angle variation of the secondary air nozzles on the combustion characteristics and NOx emission. It was found that the prediction gives a good agreement with plant data. The increase in yaw angle up to $20^{\circ}$ have results in the decrease in NOx emission at furnace exit and recirculation flow intensity, together with the increase of unburned carbon in ash. It also has been recognized the remarkably change in configuration of fire ball with increase in yaw angle. The results from this study would be valuable in the case of the combustion modification of the corner firing coal-fired utility boiler.

An Experimental Study on the Effect of Swirler Mass Flowrate and Flare Exit Length on Flow Patterns inside a Model Combustor Chamber (스월러 플레어 출구길이가 모델 챔버내 유동에 미치는 영향에 대한 실험적 연구)

  • Ryu, Gyong Won;Jin, Yu In;Kim, Yeong Ryon;Kim, Hong Jip
    • Journal of the Korean Society of Propulsion Engineers
    • /
    • v.20 no.6
    • /
    • pp.70-75
    • /
    • 2016
  • A swirler is a flame holding device generating recirculation regions in a gas turbine combustor, and the flow pattern due to a swirler has major effects on the flame distributions, combustion efficiency, and characteristics of exhaust gas. An experimental study for a counter-rotating swirler has been conducted to find out effects of the mass flow rate ratio of the inner/outer swirler flow area, the pressure difference between the swirler inlet and outlet, and the flare exit length ratio on the flow patterns in a model combustion chamber by using PIV(Particle Image Velocimetry) technique.

A Experiment of Sprinkler System to Protect Ceiling Joints of Sandwich Panel Warehouses (샌드위치패널 창고의 벽 천장 접합부 방호용 스프링클러설비 실험)

  • An, Byung-Kug;Kim, Woon-Hyung;Seo, Dong-Hun;Ham, Eun-Gu
    • Journal of the Society of Disaster Information
    • /
    • v.15 no.1
    • /
    • pp.98-108
    • /
    • 2019
  • Purpose: The purpose of this study is to test the sprinkler performance to protect the wall and ceiling joints of the sandwich panel warehouse in case of fire. Method: Based on the field surveys, test was setup and combustibles were prepared. The sprinkler discharge tests were performed at the corner of the wall and right under the sprinkler head. Results: It has been found that operation of the K-80 closed sprinkler head prevents the ignition of the sandwich panel and therefore no damage to the joints of sandwich panels. To prevent skipping phenomenon, it is necessary to install the sprinkler head from the corner of the wall and to keep a minimum distance of 2.4m and a maximum distance of 3m. Conclution: A Standard Operation Procedure should be prepared to suppress and rescue of fire brigade for a sandwich panel warehouse protected by perimeter sprinklers preventing a ignition of core materials and control fire.

Analysis on the Results of Measured Concentration of the Combustion Gases Considering Respiration Characteristics in Gasoline Pool Fire (가솔린 풀 화재에서 인체 호흡량 변화를 고려한 연소가스 농도 측정 결과 분석)

  • Choi, Seung Il;Kang, Jung Ki;You, Woo Jun
    • Fire Science and Engineering
    • /
    • v.33 no.4
    • /
    • pp.83-88
    • /
    • 2019
  • This study examined the concentration of combustion gases while considering low ventilation and respiration frequency. A one-quarter-size ISO 9705 room corner test was performed. The concentrations of carbon monoxide and oxygen were measured in each case with the continuous inhalation of combustion gas with low ventilation (2, 6, and 10 LPM) and different respiration frequencies (2 s, 5 s, and infinity). The combustion of a gasoline pool fire in the compartment had a theoretical heat release rate of 5.34 kW. The results show that the deviation of the gas concentrations becomes higher as the low ventilation increases compared to the respiration frequency. In addition, as the respiration frequency increases, the variation in the minimum oxygen concentration is larger than the average value, while in the case of carbon monoxide, the variation in the average value is larger than the maximum value. These results show that the inhalation characteristics of refugees should be considered to investigate fires.

Large Eddy Simulation of Swirling Premixed Flames in a Model Gas Turbine Combustor (모형 가스터빈 연소기에서 선회 예혼합화염의 대와동모사(LES))

  • 황철홍;이창언
    • Journal of the Korean Society for Aeronautical & Space Sciences
    • /
    • v.34 no.7
    • /
    • pp.79-88
    • /
    • 2006
  • In the present paper, the swirl flow structure and flame characteristics of turbulent premixed combustion in a model gas turbine combustor are investigated using large eddy simulation(LES). A G-equation flamelet model is employed to simulate the unsteady flame behavior. When inlet swirl number is increased, the distinct flow structures, such as the shapes of corner recirculation and center toroidal recirculation zone, are observed and the flame length is shorted gradually. Also, the phenomena of flashback are identified at strong swirl intensity. In order to get the accurate description of unsteady flame behavior, the predictive ability of the acoustic wave in a combustor is primarily evaluated. It is found that the vortex generated near the edge of step plays an important role in the flame fluctuation. Finally it is examined systematically that the flame and heat release fluctuation are coupled strongly to the vortex shedding generated by swirl flow and acoustic wave propagation from the analysis of flame-vortex interaction.

A Study on Carbon Monoxide and Other Gases During the Fire Test (A-class:1st Rating & B-class:1st Rating) (한국 A급, B급 1단위 화재 시험시 발생하는 일산화탄소 등의 정량적 연구)

  • Jeong, Incheon;Chung, Yeong-Jin
    • Fire Science and Engineering
    • /
    • v.27 no.5
    • /
    • pp.44-56
    • /
    • 2013
  • This research is to identify how much toxic combustion gases are produced from Korea standardized real fire test (Class A&B) by using Room Corner Tester (RCT) and how much those gases are possibly dangerous to testing personnel by estimating the level of carboxyhemoglobin (% COHb). It is confirmed that testing personnel can be affected as more than 40% COHb from Class A 9th and 10th rating in respiration minute volume (RMV) 2 and from Class A 5th to Class A 10th rating in RMV 3 during the time for initial three minutes. Also, in the case of Class B real fire tests, although it is considered rather safe for the initial 1 minute, testing personnel can be affected as more than 20% COHb from Class B 16th to 20th rating in RMV 3 during total test time. Currently, the Korea standard is only focusing on the protection measures against the heat, but the it is neglecting the protection measures against toxic combustion gases. Therefore, according to this study, it is strongly recommended that testing personnel should wear a self-contained breathing apparatus, or the equivalence depending on the real fire test rating.

Evaluation of the Reaction-to-fire Performance of Pipe Insulation Material using Small Room Test (룸코너 시험을 이용한 배관용 보온재의 난연성능 분석)

  • Lim, Ohk Kun;Nam, Dong-gun;Jang, Hyo-Yeon
    • Fire Science and Engineering
    • /
    • v.33 no.4
    • /
    • pp.1-8
    • /
    • 2019
  • Reaction-to-fire performance of pipe insulation materials should be approved in accordance with KS standards prior to installing water-based suppression systems because several fire accidents are initiated from insulation materials around ceilings or concealed space. A small room test to evaluate the reaction-to-fire performance of the polyethylene foam and elastomeric pipe insulation materials was conducted according to ISO 20632. Different fire growth rate and heat release rate are observed depending on the materials and construction methods. In order to improve a fire safety, the reaction-to-fire performance of pipe insulation material needs to be subdivided with regard to the heat release rate and smoke generation. Furthermore, the characteristics of the applying space are also required to be considered. Subsidiary materials for installation process such as tape and adhesive are found to provide an adverse effect to maintain a fire safety.