Tribology and Lubricants

Korean Tribology Society (한국트라이볼로지학회)
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Performance Evaluation of Wall Blower Nozzle using Erosion Analysis

침식 해석을 이용한 월 블로워 노즐의 성능 예측

  • Paek, Jae Ho (School of Mechanical Engineering, Yonsei University) ;
  • Jang, llkwang (School of Mechanical Engineering, Yonsei University) ;
  • Jang, Yong Hoon (School of Mechanical Engineering, Yonsei University)
  • 백재호 (연세대학교 대학원 기계공학과) ;
  • 장일광 (연세대학교 대학원 기계공학과) ;
  • 장용훈 (연세대학교 대학원 기계공학과)
  • Received : 2018.05.22
  • Accepted : 2018.08.24
  • Published : 2018.10.31
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Abstract

Accumulation of coal ash at the boiler wall reduces combustion and fuel efficiency. The design of a wall blower is important to effectively remove coal ash. We present numerical results for the removal of coal ash from boiler walls of domestic coal-fired power plants, associated with the computational fluid dynamics for the flow from spray nozzle to boiler wall. The numerical model simulates an erosion process in which the multiphase fluid comprising saturated vapor and fluid water is sprayed from the nozzle, and the water particles impact the boiler wall. We adopt the Finnie erosion model for water particles. We obtain the erosion rate density as a function of nozzle angle and its injection angle. As excessive coal ash removal usually induces damage to the boiler wall, the removal operation typically focuses on a large area with uniform depth rather than the maximum removal of coal ash at a specific location. In order to estimate the removal performance of the wall blower nozzle considering several functionality and reliability factors, we evaluate the optimal injection and nozzle angles with respect to the biggest cumulative and highest erosion rates, as well as the widest range and lowest standard deviation of the erosion rate distribution.

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References

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