气固射流作用下可吸入燃煤飞灰颗粒的团聚  

Agglomeration of Coal Combustion Fly Ash Inhalable Particles in Presence of Gas-Solid Jet Flow

作　　者：杨振楠[1] 郭庆杰[1] 

机构地区：[1]青岛科技大学化工学院清洁化工过程山东省重点实验室,山东青岛266042

出　　处：《高校化学工程学报》2011年第2期225-230,共6页Journal of Chemical Engineering of Chinese Universities

基　　金：国家自然科学基金(20676064);山东省自然科学基金项目(2008ZRB019E3);山东省自然科学杰出青年基金(JQ200904);山东省泰山学者建设工程基金资助项目(JS200510036)

摘　　要：团聚室中引入气固射流,使团聚室内形成局部湍流,强化颗粒间的碰撞。以撞击式采样器测量燃煤飞灰可吸入颗粒团聚前后质量变化来反映颗粒的团聚情况。实验结果表明,引入气固射流后,颗粒在团聚室内团聚沉降,撞击式采样器收集到的颗粒质量减少,颗粒清除效率提高。加入粗颗粒可有效提高可吸入颗粒清除效率,且随粗颗粒粒径增大,清除效率提高更加明显。增大射流气体流速,颗粒清除效率明显提高。当射流垂直于主气流进入团聚室时,可吸入颗粒清除效率最高,射流逆向倾斜入射时颗粒清除效率高于射流同向入射清除效率。In order to intensify the collision among the inhalable particles,a gas-solid jet flow was introduced into the agglomeration chamber to generate a local turbulent flow field.An aerosol cascade impactor was used to measure the mass change of the fly ash inhalable particles before and after agglomeration.The experimental results show that,because of the action of introduced jet flow,many fly ash inhalable particles agglomerate and settle out in the chamber,which causes that the mass of particles collected in the aerosol cascade decreases and correspondingly the particle removal efficiency increases.The experiments also show that,adding solid particles in the introduced jet flow can raise the removal efficiency;in particular,the addition of coarse solid particles leads to a higher removal efficiency of inhalable particles than that of adding fine particles.It was found that the removal efficiency can be increased significantly by raising the jet flow velocity,and the introduced direction of the jet flow affects the removal efficiency obviously.When the jet flow is introduced in the agglomeration chamber with an angle（angle between vectors of jet flow and main gas flow in the chamber） in the range of 90 180（the jet flow inclines towards the inlet of the main gas flow）,the removal efficiency of inhalable particles is higher than that when is in the range of 0 90（the jet flow inclines towards the outlet of the main gas flow）;and there exists a maximum removal efficiency of inhalable particles when the jet flow is introduced perpendicularly（= 90）

关 键 词：可吸入颗粒 团聚 射流 清除效率 

分 类 号：X513[环境科学与工程—环境工程]