• Title/Summary/Keyword: 미립화기

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Gasification characteristics of entrained flow gasifier (습식 가스화 장치에서 버너 형태에 따른 가스화 특성)

  • Ra, Ho-Won;Lee, Jae-Goo;Choi, Young-Chan;Yoon, Sang-Jun;Son, Young-Il;Hong, Jae-Chang
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.10a
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    • pp.250-253
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    • 2008
  • 최근 석탄 가스화 기술은 화석연료인 석탄을 기존의 공해물질 발생을 90%이상 줄이면서 고효율로 활용할 수 있는 방법으로 각광받고 있다. 본 연구는 당 센터에서 보유하고 있는 습식 석탄 가스화기의 성능 향상을 위하여 버너의 형태에 따른 미립화 특성을 파악하였으며, 가스화기의 버너로 적용하여 가스화 특성 실험을 실시하였다. 미립화 특성을 파악하기 위하여 개발되어진 3가지 형태의 버너를 Cold Test장치를 이용하여 $O_2$/Fuel Ratio 및 버너의 내부 혼합 방식, 분사각도에 따른 미립화 특성을 관찰하였으며, 입도 분석은 심파텍사의 입도 분석기를 이용하여 측정하였다. 실험 결과 이중혼합식 버너가 미립화 특성이 가장 우수하게 나타났으며, 외부혼합식 버너와 환형 버너의 경우 비슷한 미립화 특성을 나타내었다. 가스화기에 적용하여 실험한 결과 미립화 특성이 우수하게 나타나는 경우 가스화 특성 또한 우수하게 나타남을 확인하였다.

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A Study on the Atomization Characteristics of Effervescent Atomizer with PDPA (PDPA를 이용한 기체주입미립화기의 미립화 특성에 관한 연구)

  • Kim, Hyung-Gon;Yano, Toshiaki;Song, Kyu-Keun;Jung, Byong-Koog;Jung, Jae-Youn;Cho, Tae-Young
    • Proceedings of the KSME Conference
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    • 2004.04a
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    • pp.1316-1321
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    • 2004
  • An experimental study is performed on atomization characteristics and stable operating condition for injection of high viscous waste vegetable oil using effervescent atomizer with two aerator tubes. Consideration is given to the effects of ALR and liquid viscosity on the velocity and mean diameter of the injected droplet. It is found that (i) as ALR increases, the axial velocity of the droplet is increased, while half-velocity width and SMD are decreased regardless of the change in liquid viscosities, (ii) the rate of fine drop distribution occupied in the total spray field is increased with an increasing in ALR, and (iii) the effect of viscosity on atomization characteristics is minor.

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Atomization characteristics of burner nozzle for entrained flow gasifier (습식 석탄 가스화 장치에서 버너노즐에 따른 미립화 특성)

  • Ra, Ho-Won;Lee, Jae-Goo;Choi, Young-Chan;Yoon, Sang-Jun;Son, Young-Il;Hong, Jae-Chang
    • 한국신재생에너지학회:학술대회논문집
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    • 2008.05a
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    • pp.353-355
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    • 2008
  • 최근 석탄 가스화 기술은 화석연료인 석탄을 기존의 공해물질 발생을 90%이상 줄이면서 고효율로 활용할 수 있는 방법으로 각광받고 있다. 본 연구는 습식 석탄 가스화기에서 가스화의 핵심적인 요소인 버너의 분무 관계 분야에 대한 분무 특성 및 무화성능을 높일 수 있는 분무기의 구조 및 운전 조건 등을 제시 할 목적으로 분무 시 내부를 관찰 할 수 있는 아크릴을 이용하여 내부 혼합식 버너를 제작하였다. 미립화 특성을 파악하기 위하여 $O_2$/Fuel Ratio 및 버너의 내부 혼합 방식, 분사각도, 각 분사 높이에 따른 미립화 특성을 관찰하였으며, 입도 분석은 심파텍사의 입도 분석기를 이용하여 측정하였다. 내부 혼합식 버너의 입도는 분사 각도와 $O_2$/Fuel Ratio에 따라서 변화하는 경향을 나타냈으며, 공급되어지는 Fuel은 석탄 슬러리와 물을 이용하여 각각의 입도를 측정하였다. slurry의 공급량이 고정된 상태에서 산소 공급량이 증가함에 따라 미립화도는 증가하는 경향을 나타내었으며, 슬러리 공급량과 산소 공급량이 동일한 경우 버너의 분사 각도에 따라 미립화도가 다르게 나타나는 특성을 관찰하였다.

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Atomization Characteristics of Effervescent Atomizer with the Variations of Operating Conditions (작동조건 변화에 따른 기체주입미립화기의 미립화 특성)

  • Kim, Hyung-Gon;Yano, Toshiaki;Song, Kyu-Keun
    • Proceedings of the KSME Conference
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    • 2003.11a
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    • pp.869-874
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    • 2003
  • The atomization characteristics were investigated through the influence of the change of GLR and the change of working fluid on droplet size distribution and mean diameter of drop produced by effervescent atomizer. For simultaneous injection of water and high viscous waste vegetable oil, effervescent atomizer with two aerator tubes was specially designed. From the experimental results, regardless of mass fraction of vegetable oil in working fluids, it is expected that effervescent atomizer will exhibit excellent atomization performance at the high GLR conditions.

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Studies of rate of ash deposit of various coals for analysis of IGCC fouling effect (석탄가스화기 파울링 현상 해석을 위한 탄종별 회분퇴적속도 연구)

  • 임병표;최병철;김형택
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • 2000.11a
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    • pp.61-66
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    • 2000
  • 분류층 건식 석탄가스화 방식을 택하고 있는 아주대학교 내 BSU 가스화기는 반응 후 회분을 용융상태의 슬랙으로 처리하여 가스화기 하단으로 배출하고, 생성된 석탄가스는 가스화기 상부로 배출시켜 생성된 석탄가스로의 슬랙 유입을 최소화한 디자인이다. 이러한 분류층 가스화기는 고정층이나 유동층 방식의 가스화기에 비해 가스화기 출구에서의 온도가 130$0^{\circ}C$이상의 고온이 유지되므로, 미분탄을 사용하는 분류층 가스화방식에서는 미립 입자 일부가 비말동반되어서 미분탄내의 회재를 100% 용융 슬랙으로 처리하기는 불가능하고, 수 % 정도는 생성 석탄가스와 함께 가스화기 밖으로 배출된다.(중략)

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A Study on the Analysis of Atomization Mechanism for the Air Shrouded Injector (공기 보조 미립화 인젝터의 미립화 메카니즘 해석에 관한 연구)

  • 김봉규;이기형;이창식;서영호
    • Transactions of the Korean Society of Automotive Engineers
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    • v.9 no.1
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    • pp.57-62
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    • 2001
  • EFI system has severe problems of heavy HC emission generated by large fuel droplets and non-uniform air-fuel mixture. Therefore, various atomization techniques are being developed in order to reduce HC emission. The one among those techniques is ar shrouded injector, which has better atomization ability and demands less power loss than other atomizers. Thus, the development of this air shrouded injector can be major topic to cope with international emission regulation. Nevertheless, there are few domestic and foreign studies which deal with air shrouded injector. In this study, the spray characteristics and atomization mechanism of the representative air shrouded injector were analyzed using PDPA system. From experimental results, the definite standards of air shrouded injector's spray characteristics were established.

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Study on the Atomization Characteristics of a Counter-swirling Two-phase Atomizer with Variations of Swirl angle (역선회 이류체 미립화기의 선회각 변화에 따른 미립화 특성연구)

  • Kim, N.H.;Lee, S.G.;Ha, M.H.;Rho, B.J.;Kang, S.J.
    • Proceedings of the KSME Conference
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    • 2001.06e
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    • pp.125-130
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    • 2001
  • Experimental and analytical researches have been conducted on the twin-fluid atomizers for better droplet breakup during the past decades. But, the studies on the disintegration mechanism still present a great challenge to understand the drop behavior and breakup structure. In an effort to describe the aerodynamic behavior of the sprays issuing from the internal mixing counter-swirling nozzle, the spatial distribution of axial (U) radial (V) and tangential (W) components of droplet velocities are investigated across the radial distance at several axial locations of Z=30, 50, 80, 120 and 170mm, respectively. Experiments were conducted for the liquid flow rates which was kept constant at 7.95 g/s and the air injection pressures were varied from 20 kPa to 140 kPa. Counter-swirling internal mixing nozzles manufactured at angles of $15^{\circ},\;30^{\circ},\;45^{\circ}$ and $60^{\circ}$ the central axis with axi-symmetric tangential-drilled holes was considered. The distributions of velocities and turbulence intensities are comparatively analyzed. PDPA is installed to specify spray flows, which have been conducted along the axial downstream distance from the nozzle exit. Ten thousand of sampling data was collected at each point with time limits of 30 second. 3-D automatic traversing system is used to control the exact measurement. It is observed that the sprays with all swirl angle have the maximum SMD for on air injection pressure of 20 kPa and 140 kPa with centerline, respectively. The nozzle with swirl angle of $60^{\circ}$ has vest performance.

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Examination on Fire Extinguishing Performance of Full Cone and Hollow Cone Twin-fluid Atomizers: Effects of Supply Gas and Water Mist (중실원추형 및 중공원추형 2유체 미립화기의 화재 소화 성능 검토: 공급 기체와 미분무 영향)

  • Kim, Dong Hwan;Lee, Chi Young
    • Fire Science and Engineering
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    • v.33 no.5
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    • pp.28-36
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    • 2019
  • In the present study, the effects of supply gas and water mist on the heptane pool fire extinguishing performance were investigated using the full cone and hollow cone twin-fluid atomizers. Air or nitrogen of 30 lpm (Liter per minute; L/min) was used as the supply gas, and the experiments were conducted under the water flow rate conditions of 0 lpm (i.e., discharge of air or nitrogen only) and 0.085 lpm (i.e., discharge of water mist with supply gas). Experimental results confirmed that the use of water mist discharge with the supply gas and full cone spray pattern reduced the fire extinguishing time as compared to that of only supply gas discharge and hollow cone spray pattern. In addition, for the discharge of water mist using the full cone twin-fluid atomizer, water mist significantly affected fire extinguishing performance, whereas the effect of the supply gas was less pronounced. On the other hand, for the discharge of water mist using the hollow cone twin-fluid atomizer, the fire extinguishing time was remarkably reduced by the supply of nitrogen, as compared with that of air, indicating that the supply gas as well as water mist can significantly affect fire extinguishing performance.

Pulverized Coal Particle Presence Inside CWM Droplet (CWM 방울안의 미분탄 존재)

  • 김종호;김성준
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.14 no.5
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    • pp.1211-1221
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    • 1990
  • The purpose of this study is to get experimental data on the distribution of CWM (Coal- Water Mixture) droplets size and the presence of pulverized coal particles inside CWM droplets. Atomization of CWM is done by Twin-Fluid Atomizer. The operational parameters are atomizing air pressure, coal particle loading, mean size of pulverized coal particles and sampling positions across spray. Th data analysis is initiated by Impression Sampling Method(Magnesium Oxide Technique) and Photo-technique and counting works are followed. Experimental work induces following research results. The variation of particle loadings in slurry makes no appreciable effects on the mean size of CWM droplets. It is evident that atomizing air pressure has very strong effect on the atomization of slurry. The mean size of atomized fuel droplets is dramatically reduced with the increasing air pressure. The population ratio of droplets without coal particles to total number of droplets is decreased as atomizing air pressure or loading rises and the same trend is obtained as the mean size of coal particles becomes smaller but a certain tendency of coal particle presence inside droplets could not be found from the change of sampling positions.

Vaned Wheel Atomization of CWM (Vaned Wheel Atomizer에 의한 CWM 미립화)

  • 김성준;김용선
    • Transactions of the Korean Society of Mechanical Engineers
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    • v.16 no.5
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    • pp.974-982
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    • 1992
  • The atomizations of CWM slurry and water are done by a wheel atomizer which is designed and manufactured for this experiment. The variables of the experiment are the angle of vane, aspect ratio, particle loading and the mean size of coal particle distribution. The main purposes of the experiment are to know how the angle of vane and aspect ratio of vane influence the size distribution of CWM droplets. The experimental results say there are no appreciable effects on the mean size of CWM droplets from the change of loading of coal prticles in slurry. The mean size of coal particle in slurry, however, influence quite strongly the mean size of CWM droplets. The mean size of CWM droplets is quite strongly affected by the angle of vane. The size distribution of CWM droplets is controllable by the change of aspect ratio.