洁净煤技术

2020, v.26;No.130(06) 159-167

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CFB锅炉可调效率的旋风分离器性能数值模拟研究
Numerical simulation of the performance of cyclone separator with adjustable efficiency in CFB boiler

袁东辉;孙世超;郑秀平;韩义;王研凯;段伦博;
YUAN Donghui;SUN Shichao;ZHENG Xiuping;HAN Yi;WANG Yankai;DUAN Lunbo;Inner Mongolia Electric Power Research Institute Branch,Inner Monglia Electric Power (Group) Co.,Ltd.;Key Laboratory of Energy Thermal Conversion and Control,Ministry of Education,Southeast University;Inner Mongolia Jingtai Power Generation Co.,Ltd.;

摘要(Abstract):

在旋风分离器锥形筒斜面上距离锥形筒顶端50 cm处为中心点开孔,将分离器入口方向开孔命名为0°孔,俯视顺时针依次旋转90°,分别命名为90°孔、180°孔、270°孔。向上述开孔中通入干扰风能调整分离器效率,但通入干扰风对压降的影响未知。为了研究通入干扰风对旋风分离器整体性能(压降、分离效率、床温)的影响规律并得到最佳开孔方案,以某300 MWe循环流化床锅炉旋风分离器为对象,通过数值模拟研究分离效率可调的循环流化床锅炉旋风分离器压降变化特性。在不通入干扰风时模拟不同入口气速下的压降,并与压降经验模型计算结果进行比较,结果表明,压降随入口速度的增大而增大,且模拟结果与Chen-Shi模型计算结果吻合良好。模拟入口速度为7.48 m/s时,在0°、90°、180°、270°孔通入干扰风速分别为10、20、30 m/s时的压降,结果表明,在0°孔和90°孔中,压降随干扰风速的增大而减小;在180°孔和270°孔中,压降随干扰风速的增大先增大后减小。结合在不同孔通入干扰风时床温的变化规律,可认为90°孔的改造方案较好。
The holes are opened at the center point 50 cm away from the top of the conical cylinder on the inclined plane of the cyclone separator.The opening in the inlet direction of the cyclone separator is named as 0° hole which is rotated 90° clockwise from the inlet direction of the cyclone separator,and named as 90° hole,180° hole and 270° hole,respectively.The separator efficiency is adjusted by introducing interference wind into the opening of conical cylinder of cyclone separator,but the influence of the interference wind on the pressure drop of the cyclone separator is unkuown.In order to study the effect of the interference wind on the whole performance of the cycle including pressure drop,separation efficiency and bed temperature change,and get the best opening scheme,the pressure drop characteristics of a 300 MWe CFB cyclone with adjustable separation efficiency were studied by numerical simulation in this paper.Firstly,the pressure drop at different inlet velocities was simulated without interference wind,and the results were compared with the calculation results of empirical pressure drop model.The results show that the pressure drop increases with the increase of inlet velocity,and the simulation results are in good agreement with Chen-Shi model.Then the pressure drop is simulated when the inlet velocity is 7.48 m/s and the interference wind speed is 10,20 and 30 m/s at 0°,90°,180° and 270° holes,respectively.The results show that the pressure drop decreases with the increase of the interference wind speed in the 0° and 90° holes,and the pressure drop first increases and then decreases with the increase of the interference wind speed in the 180° and 270° holes.Combined with the variation of bed temperature when the interference wind is introduced into different holes,it can be considered that the 90° hole is a better reconstruction scheme.

关键词(KeyWords): 循环流化床(CFB);旋风分离器;CFD模拟;压降
circulating fluidized bed;cyclone separator;CFD simulation;pressure drop

Abstract:

Keywords:

基金项目(Foundation): 国家重点研发计划资助项目(2018YFB0605301)

作者(Author): 袁东辉;孙世超;郑秀平;韩义;王研凯;段伦博;
YUAN Donghui;SUN Shichao;ZHENG Xiuping;HAN Yi;WANG Yankai;DUAN Lunbo;Inner Mongolia Electric Power Research Institute Branch,Inner Monglia Electric Power (Group) Co.,Ltd.;Key Laboratory of Energy Thermal Conversion and Control,Ministry of Education,Southeast University;Inner Mongolia Jingtai Power Generation Co.,Ltd.;

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DOI: 10.13226/j.issn.1006-6772.20061010

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