摘要
文章采用计算颗粒流体力学(CPFD)数值模拟方法并结合单因素分析法,构建长17.76 m、宽5.08 m、高11.8 m的余热锅炉沉降室模型,并配置了90°叶片倾角的分离挡板。通过模拟不同粒径、进料流率和进气速度条件下的烟气沉降过程,分析其对偏流现象及沉降效率的影响规律。结果表明,粒径从10μm增至50μm时,偏流系数绝对值显著增大,沉降效率从28%提升至80%;进料流率从2.5 kg/s增至6.5 kg/s,偏流系数绝对值减小,沉降效率从52%降至46%;进气速度从2.5 m/s增至4.5 m/s,偏流系数绝对值微增,沉降效率从62%降至30%。CPFD仿真结果表明,偏流影响因子排序为颗粒粒径>进料流率>进气速度。沉降效率影响因子排序为颗粒粒径>进气速度>进料流率。增加粒径、降低进气流速并选择适宜的进料流率,可提高沉降效率并减轻偏流对管道的冲蚀。
In this paper,the numerical simulation method of computational particle fluid dynamics(CPFD)combined with the single factor analysis method was used to construct a settling chamber model of the waste heat boiler with a length of 17.76 m,a width of 5.08 m,and a height of 11.8 m,and a separation baffle with a blade inclination angle of 90°was configured.By simulating the flue gas sedimentation process under different particle sizes,feed flow rates and inlet velocities,the influence of flue gas on the bias flow phenomenon and sedimentation efficiency was analyzed.The results show that when the particle size increases from 10μm to 50μm,the absolute value of the bias coefficient increases significantly,and the sedimentation efficiency increases from 28%to 80%.The feed flow rate increased from 2.5 kg/s to 6.5 kg/s,the absolute value of the bias coefficient decreased,and the sedimentation efficiency decreased from 52%to 46%.The inlet velocity increased from 2.5 m/s to 4.5 m/s,the absolute value of the bias coefficient increased slightly,and the sedimentation efficiency decreased from 62%to 30%.The CPFD simulation results show that the influencing factors of bias flow are ranked as particle size>feed flow rate>inlet velocity.The influencing factors of sedimentation efficiency are ranked as particle size>inlet velocity>feed flow rate.Increasing particle size,decreasing inlet air velocity,and selecting the appropriate feed flow rate can improve settling efficiency and mitigate deflection of pipes.
作者
黄波
周崇山
王漫漫
程林
王佳
谢亮亮
卢哲哲
Huang Bo;Zhou Chongshan;Wang Manman;Cheng Lin;Wang Jia;Xie Liangliang;Lu Zhezhe(School of Mechanical Engineering,Sichuan University of Science&Engineering,Yibin,Sichuan 644000,China)
出处
《化工设备与管道》
北大核心
2025年第4期5-11,共7页
Process Equipment & Piping
基金
过程装备与控制工程四川省高校重点实验室(项目编号:GK202306)
四川省科技厅重点研发项目(项目编号:22SYSX0141)。
关键词
余热锅炉
沉降室
偏流
沉降特性
waste heat boilers
settling chamber
drift
sedimentation characteristics
