• Title/Summary/Keyword: 실속 여유

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Adjustment of the Excess Air Ratio for Stabilizing the Draft System in a Large Capacity Coal Fired Power Plant (대형 석탄화력 발전소에서 통풍계통 안정화를 위한 과잉공기비 조정)

  • Park, Kun Woo;Yoo, Ho-Seon
    • Plant Journal
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    • v.14 no.2
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    • pp.39-44
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    • 2018
  • In this study, I analyzed the effects on stabilizing the draft system, boiler efficiency when changing excess air ratio under 870 MW load limit operation condition in a large capacity coal fired power plant and decided optimum excess air ratio. It is positively necessary to choose adequate excess air ratio for stabilizing draft system because air pre-heater pressure drop and induced draft fan first stall margin are changing when adjusting excess air ratio. This study therefore, measured air pre-heater pressure drop, induced draft fan first stall margin, boiler efficiency, loss and has chosen adequate excess air ratio adjusting excess air ratio from 1.153 to 1.127. So it is recommended that the operation point needs to be changed to 1.127 that is not only to decrease air pre-heater pressure drop and to stabilize draft system and to secure stall margin but also to maintain boiler efficiency to equivalent level.

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Prediction of the Occurring Time of Stall for a Booster Fan in a Power Plant Combusting Low Quality Coal through Draft Loss (저품위탄 연소시 탈황용 승압송풍기 실속시점 예측)

  • Kim, Yeong-Gyun;Lee, Jae-Heon
    • Plant Journal
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    • v.8 no.4
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    • pp.34-39
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    • 2012
  • This study presents how low quality coal combustion affects the desulfurizer draft system by correlating of draft loss in a coal-fired thermal power plant and predicts the stall occurrence time of a booster fan. In case of low quality coal, a lot of coal is needed to generate equivalent output power, thereby the rating of increasing draft loss was faster than designed amount of coal. We surely confirmed that draft loss affects the specific energy of a booster fan strongly. On this basis, it is possible to predict the occurring time of stall for a booster fan from current operation specific energy to stall limit specific energy. This study suggests increasing speed of draft loss in each caloric value and the impact of specific energy at a booster fan, it expects to help safe operating in a thermal power plant.

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10kW wind turbine blade aerodynamic design and verification (10kW 풍력발전기 블레이드 형상 개념 설계 및 타당성 검증)

  • Yoo, Cheol;Son, Eunkuk;Hwang, Sungmok;Kim, Daejin;Kim, Seokwoo
    • Journal of Aerospace System Engineering
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    • v.11 no.6
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    • pp.42-49
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    • 2017
  • A 10kw wind turbine blade aerodynamic design was carried out using the self-developed program AeroDA. The concept, basic shape, and optimization were designed and verified. A performance analysis was carried out and the key factors in each design stage are summarized. In addition, a guide for the placement of cross-section airfoils constituting the blades is presented, and the importance of the stall margin test as a method of verifying aerodynamic design is summarized. In order to verify the design program AeroDA, we compared the results of the performance analysis with a specialized program DNVGL_Bladed.