摘要
通过数值模拟软件Fluent,以N-S方程和RNGk-ε模型为基础,采用拉格朗日颗粒轨道模型对引风机内部流场和颗粒轨迹进行数值模拟,发现叶轮进口吸力面上存在回流及边界层分离现象,易引起颗粒沉积。对加入气流吹扫后风机的内部流场和颗粒轨迹进行了数值模拟,表明在适当角度加入一定动量的吹扫气流,可以改变风机吸力面上的涡流区流场,减少颗粒沉积,以及使沉积的灰粒脱落。投入4～6个喷嘴清灰效果最佳。
Through numerical simulation software Fluent, and taking the N - S equation and the RNG k-e model as basis, using Lagrangian particle trajectory model,the numerical simulation of flow field in centrifugal induced draft （ID） fan and the running track of solid particles in the fan has been carried out, the phenomena of back flow and boundary layer separation existing on suction surface at entrance of the impeller being discovered,easily leading to deposition of solid particles. The internal flow field and the running track of solid particles in the fan after adding air flow for soot - blowing have been nu- merically simulated. In the event of adding air flow at suitable angle for blowing, the flow field in the vortex zone on suction surface of ID fan may be changed,reducing the deposition of ash particles,even making the deposited ash particles to drop off. The effectiveness of ash cleaning is optimal when put-ting 4-6 nozzles into service.
出处
《热力发电》
CAS
北大核心
2012年第1期34-36,41,共4页
Thermal Power Generation
关键词
引风机
灰
颗粒沉积
气力吹灰
喷嘴
ID fan
ash particles deposition
pneumatic soot - blowing
nozzle
