• Title, Summary, Keyword: Slagging

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Derivation of TMA Slagging Indices for Blended Coals

  • Park, Ho Young;Baek, Se Hyun;Kim, Hyun Hee;Park, Sang Bin
    • KEPCO Journal on Electric Power and Energy
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    • v.3 no.2
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    • pp.127-131
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    • 2017
  • The present paper describes the slagging field data obtained with the one-dimensional process model for the 500 MW tangentially coal fired boiler in Korea. To obtain slagging field data in terms of thermal resistances [$m^2{\cdot}^{\circ}C/kW$], a number of plant data were collected and analyzed with the one-dimensional modelling software at 500 MW full load. The slagging field data for the primary superheater were obtained for six coal blends, and compared with two TMA (Thermo-Mechanical analyzer) slagging indices and the numerical slagging index, along with the conventional slagging indices which were modified with the ash loading. The advanced two TMA indices for six blended coals give a good slagging tendency when comparing them with the slagging field data, while the modified conventional slagging indices give a relatively poor agreement.

Prediction of Slagging Behavior of Coal Ash in Gasifier using DTF (DTF를 이용한 가스화기에서 석탄회의 Slagging 성향 예측에 관한 연구)

  • 정석우;김형택;이시훈
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.22-27
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    • 1994
  • 6종류의 유연탄을 대상으로 석탄회분의 용융온도와 화학적조성을 측정하고, 대상탄 회분에 대해 Rs 값과 Fs 값을 계산해 봄으로써 각 탄들의 Slagging 성향을 알아보았다. 그리고, 이 자료만으로는 정확한 Slagging 성향의 예측이 어려우므로 분류층 가스화기의 조건을 모사한 DTF(Drop Tube Furnace : 이하 DTF)장치를 이용하여 온도와 체류시간을 달리하면서 생성되는 Slag의 화학적조성, 강도, 점착속도 등을 측정하여 Slagging 형태의 가스화기 운전에 있어서 최적조건을 제시하고자 한다.

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Slagging 연소기의 연소특성

  • 현주수;손응권;이시훈;박철우;박교식
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.133-140
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    • 1995
  • Cyclone 원리를 이용한 Slagging 연소기술은 접선방향으로 고속공급되는 연소용 공기에 의해 석탄입자가 연소실 벽면에 체류하면서 벽면연소가 이루어지며, 3중 선회 유동장의 형성으로 연료의 체재시간이 길며, 고온연소시킴으로서 석탄중의 회분을 연소기내에서 용융제거하는 석탄 직접연소의 신기술이다. 실험용으로 제작된 75 kW급 Slagging 연소기에서 Alaska subbituminous 탄으로 성능실험을 수행한 결과 탄소전환율이 95% 이상이며 회분의 용융제거 효율은 약 70%인 것으로 판명되었으며, 연료의 적용범위를 확대하기 위해 Roto탄, Ulan탄 및 Roto탄에 국내 무연탄인 장성탄을 20% 혼합한 혼합탄에 대한 연소실험과 Alaska탄 입자크기의 영향도 알아보았다. Slagging 연소기의 개발을 위해 소형 연소기 실험결과와 유동장 해석, Cold model test를 거쳐 현재 1MW급 연소기가 설계, 제작되어 실험하는 단계에 있다.

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Prediction of ash deposition propensity in a pilot-scaled pulverized coal combustion (미분탄 연소에 따른 슬래깅 예측 모델 개발 및 검증)

  • Jang, Kwonwoo;Han, Karam;Huh, Kang Y.;Park, Hoyoung
    • 한국연소학회:학술대회논문집
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    • pp.87-90
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    • 2013
  • In pulverized coal fired boilers, slagging and fouling may cause significant effect on the operational life of boiler. As increasing a consumption of low rank coal, slagging and fouling are main issues in pulverized coal combustion. This study predicts ash deposition propensity in a 0.7 MW pilot-scale furnace. Slagging model is employed as a User-Defined Function (UDF) of FLUENT and validated against measurement and prediction. The results show good agreement compared with experiment. There is need to development of a pulverized coal combustion and slagging analysis at low coal.

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A Study of Chemical Properties and Fusibility of Korean Anthracite Coal Ash (국내 무연탄회의 화학조성 및 용융특성에 관한 연구)

  • Park, Cheol-Woo;Lee, See-Hoon;Shon, Eung-Kwon
    • Analytical Science and Technology
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    • v.5 no.4
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    • pp.433-441
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    • 1992
  • Chemical composition and fusibility of coal ash were measured for 23 Korean anthracite coals. The relationship between chemical properties and fusion temperature of coal ash was investigated. The slagging and fouling in firing the pulverized coal for boiler was assessed for the coal samples. It was found that most ashes contained more than 80% of $SiO_2$ and $Al_2O_3$ whereas less than 1% of $Na_2O$. And also fusion temperature of ashes occured relatively higher for Korean coals. Therefore it can be predictable that the slagging and fouling formation has a little problem in a pulverized coal firing system. A base/acid ratio did show a good correlation with fusion temperature for these coal ashes.

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An Experimental Study on Slagging/Fouling Characteristics for Various Coals in a 50kWth Pulverized Coal Combustion System (50kWth미분탄 연소 시스템에서 탄종별 슬래깅 및 파울링 특성 연구)

  • Kang, Kieseop;Lee, Jaewook;Chae, Taeyoung;Ryu, Changkook;Yang, Won
    • 한국연소학회:학술대회논문집
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    • pp.107-109
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    • 2012
  • In Korean coal power plants, rising coal prices have recently led to the rapid utilization of low lank coals such as sub-bituminous coal with low calorific values and low ash fusion temperatures. Using these coals beyond the design range has resulted in important issues including slagging and fouling, which cause negative effects in boiler performances and unstable operations. The purpose of this study is to observe slagging and fouling characteristics resulted from burning various ranks of pulverized coals. We have tested 3 different coals: FLAME(bituminous), KCH(sub-bituminous) and MOOLARBEN(bituminous)coals in the pilot system $50kW_{th}$ scale. A stainless steel tube with preheated air inside was installed in the downstream in order to simulate water wall. Collected ash on the probe and the slag inside the furnace near burner were analyzed by SEM (scanning electron microscopy) to verify the formation degree, surface features and color changes of the pasty ash particles. Induced coupled plasma and energy dispersive X-ray spectroscopy were also performed to figure out the chemical characteristics of collected samples. As a result, KCH was observed that more slag was developed inside the walls of the furnace and on the probe than the other two kinds of coals, as shown in the calculate slagging and fouling indices as well.

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A Predictional Study on the Slagging and Fluid Behavior of Coal Ash under the Gasifier Condition. (가스화기에서 석탄회분의 Slagging 성향 및 용융거동 예측에 관한 연구)

  • 배한진;김형택;손응권;최상일;이시훈;박주식;윤용승;정석우
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.113-122
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    • 1996
  • 본 연구는 석탄가스화복합발전(IGCC)의 핵심부분이라 할 수 있는 슬래깅 형태의 분류층 가스화기에 원활한 Slagging을 유지하기 위해 Flux addition method와 Coal blending method를 적용하였다. 대상탄으로는 가스화에 적합하다고 알려진 알라스카탄, 대동탄과 비교탄으로 가스화에 부적합하다고 알려진 1종류의 유연탄을 대상으로 기본분석 및 화학적 조성분석, 용융온도를 측정하여 봄으로써 대상탄들의 슬래깅성향을 평가하였다. 대동탄과 알라스카탄에 대해서는 Flux addition method를 적용하고, 비교탄에 대해서는 Coal blending Method를 적용한 후, 140$0^{\circ}C$로 운전되는 가스화기의 효율을 최대화할 수 있는 Flux 첨가비와 blending ratio를 산정하였다.

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The evaluation of combustion characteristics for 2 kinds of Indonesian sub-bituminous coals by using combustion test facility at KEPRI (시험연소로를 이용한 인도네시아산 아역청탄 2종의 연소특성 평가)

  • Lee, Hyun-Dong;Kim, Sung-Chul;Kim, Jong-Jin;Kim, Tae-Heung;Yang, Seung-Han;Shin, Young-Jin;Min, Chang-Gi
    • 한국연소학회:학술대회논문집
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    • pp.27-46
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    • 1999
  • Combustion test on two kinds of Indonesian sub-bituminous coals of single and blended with bituminous coal imported for power generation was carried out by using the test furnace at KEPRI. The main items of combustion test were temperature profiles of the inside furnace, the yield of unburned carbon, environmental pollution emissions, slagging/fouling tendency, and the comparison of heat loss of furnace. The test results showed that low sulfur and ash content characterized by the Indonesian coals were advantageous to environmental aspect, but high tendency of heat loss and slagging/fouling were disadvantageous to boiler operation. From the results, the necessity of proper coal blending to compensate these weak points was recommended.

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Numerical Study on the 300 MW Shell-type One-stage Entrained Flow Coal Gasifier Apllied with 4-Layer Slagging Model (4-Layer Slagging Model을 적용한 300 MW급 Shell형 1단 분류층 석탄 가스화기 전산수치해석)

  • Hong, Jung-Woo;Jeong, Hyo-Jae;Song, Ji-Hoon;Hwang, Jung-Ho
    • Journal of the Korean Society of Combustion
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    • v.17 no.1
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    • pp.1-11
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    • 2012
  • A slag building simplified model was developed to determine wall heat flux of a Shell 300 MW coal gasifier. In the model 4 layers(particulate, sintered, molten slag, solidified slag) were considered and mass conservation and energy balance were used to obtain each slag layer's thickness and surface temperature. Thermo-chemical and fluid charateristics of the gasifier were studied with and without considering the slag model using commercial CFD code FLUENT. Consideration of the slag layer did not affect syn-gas mole fractions. However, the slag layer caused to increase the exit gas temperature by about 50 K.

Study on the 2-staged slagging coal combustion for reduction of fly-ash and NOx (석탄의 Slagging 연소와 2단 연소기술에 의한 분진 및 NOx 저감 연구)

  • 최상일;박주식;손응권;김호영;김재호
    • Proceedings of the Korea Society for Energy Engineering kosee Conference
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    • pp.49-56
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    • 1998
  • 최근 국내의 에너지 수요는 특히 전기에너지 분야에서 급격한 증가추세를 보여왔으며 그 결과 전력생산을 위한 화석연료 중 특히 석탄의 사용량은 해가 갈수록 증가하였으며 이에 따라 다량의 대기오염물질과 온실가스 등이 발생하고 있어서 미래의 석탄 연소시스템들은 높은 열효율과 최소의 대기오염물질 배출을 필요로 하고 있다. (중략)

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