摘要
针对某600MW燃煤机组的碱性干粉SO3脱除系统中气-固喷枪发生堵粉及碱粉分布均匀性差等问题,开展气-固喷枪性能优化工作,采用CPFD方法进行三维非稳态气固流动特性的数值模拟,并从气体射流速度和防磨瓦长度两方面进行喷枪的优化调整,以烟道出口颗粒体积分数的PieLou指数对颗粒分布的均匀性进行定量分析,并以此作为喷枪性能的评价指标。结果表明,随着气体射流速度的增大,颗粒的均匀性先提高后降低,在20-22m/s速度区间内出现最优值;防磨瓦的设置有利于粉体在烟道深度方向和横向的扩散,随着防磨瓦长度的增加颗粒的均匀性提高。在此基础上提出了喷枪的优化方案,优化后的喷枪与原喷枪相比均匀性提高了14.1%。
In a 600 MW dry sorbent injection system for SO3 removal, as a conveyer of dry sorbent,the gas-solid injecto’s performance should be further optimized. The gas jet velocity and protective cover length that affected the performance of gas-solid injector were analyzed through computational particle fluid dynamic(CPFD) simulation. Particle volume fraction on outlet plane was analyzed with PieLou number as evaluation index. The results show that the distribution uniformity firstly increases and then decreases with the increase of gas jet velocity. The optimal distribution uniformity appears about 20-22 m/s. The protective cover can benefit the particles distribution uniformity. And the distribution uniformity increases with protective cover length. One efficient combinations of gas-solid injector was suggested in this study. The distribution uniformity of optimized gas-solid injector is increased 14.1% compared with the initial one.
作者
邱桂芝
张志刚
郭婷婷
叶佳敏
QIU Gui-zhi;ZHANG Zhi-gang;GU0 Ting-ting;YE Jianmin(Institute of Thermal Power Generation Technology,China Datang Corporation Scienceand Technology Research Insitute,Beijing 100040,China;Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China)
出处
《计算机仿真》
北大核心
2019年第6期150-154,165,共6页
Computer Simulation
基金
2015年中国大唐集团公司技术改造专项基金(DTJG2015-GJ088)
