旋风分离器入口结构对CFB锅炉循环物料分配特性的影响研究  

Study on the Effect of Cyclone Inlet Structure on the Circulating Material Distribution Characteristics of CFB Boiler

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作  者:谢玉婷 刘海玉[1] 牛俊天 周世豪 李昊 金燕[1] XIE Yuting;LIU Haiyu;NIU Juntian;ZHOU Shihao;LI Hao;JIN Yan(School of Electrical and Power Engineering,Taiyuan University of Technology,Taiyuan 030024,Shanxi Province,China)

机构地区:[1]太原理工大学电气与动力工程学院,山西省太原市030024

出  处:《中国电机工程学报》2025年第9期3572-3581,I0025,共11页PROCEEDINGS OF THE CHINESE SOCIETY FOR ELECTRICAL ENGINEERING

摘  要:随着循环流化床锅炉参数不断增大,旋风分离器的数量和尺寸也不断变化,多分离器并联布置时,分离器入口的气固流动容易出现不均匀性,影响炉内燃烧和安全。基于计算颗粒流体力学(computational particle fluid dynamics,CPFD)方法,对660 MW超临界CFB锅炉建立全回路几何模型并进行数值模拟,研究分离器入口结构对“H”型布置的六分离器循环物料分配特性的影响。结果表明:中间分离器的入口位置、炉内屏式过热器的布置方式、中间分离器入口的角度和高度,以及炉膛顶部凸起高度对六分离器入口的物料分配均有影响;中间分离器入口位置为前墙“偏心-轴对称”布置,炉内屏为均匀布置时分离器入口颗粒流量偏差较小;随着中间分离器入口角度增大,偏差先减小后增大,65.6°时偏差最小;随着中间分离器入口高度增大,偏差先减小后增大,9.25 m时偏差最小,高度大于9.5 m后,中间分离器入口的颗粒流量大于两边;随着炉顶凸起高度增加,偏差先减小后增大,在300 mm时偏差最小。As circulating fluidized bed(CFB)boiler parameters increase,the number and size of cyclone separators continually evolve.With multiple separators arranged in parallel,gas-solid flow at the separator inlets becomes prone to non-uniformity,affecting furnace combustion and safety.A full-circuit geometry model is developed for a 660 MW supercritical CFB boiler.Using the continuum particle fluid dynamics(CPFD)method,numerical simulations investigated how separator inlet structures influence material distribution across six"H"-arranged separators.Results reveal that the intermediate separator's inlet position,furnace screen superheater arrangement,inlet angle and height,and hearth protrusion height all impact material distribution.An"eccentric-axisymmetric"front-wall inlet position for the intermediate separator,combined with uniform furnace screen arrangement,minimizes particle flow deviation.Reducing the intermediate separator's inlet angle initially decreases then increases deviation,reaching a minimum at 65.6°.Increasing the intermediate separator's inlet height similarly first reduces then raises deviation,with optimal uniformity at 9.25 m.Above 9.5 m height,the intermediate separator exhibits smaller inlet deviation but greater particle flow than side separators.For the furnace roof bulge,deviation follows the same trend,achieving minimal imbalance at 300 mm height.

关 键 词:循环流化床 计算颗粒流体力学 旋风分离器 物料分配 

分 类 号:TM621.2[电气工程—电力系统及自动化]

 

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