【摘要】 利用高梯度磁场试验装置进行了捕集燃煤可吸入颗粒物的试验研究.采用电称低压冲击器(ELPI)在线实时测量了颗粒浓度的变化,系统研究了颗粒磁性、磁场强度、气溶胶流速和磁介质填充率对颗粒捕集效率的影响.结果表明:在0.1-10μm范围内,颗粒的总捕集效率可以达到25%-36%;较大和较小的颗粒捕集效率相对较高;而粒径在1-3μm的颗粒捕集效率相对较低.磁矩较大的样品,其捕集效率较高.磁场强度和磁介质填充率的增加可以提高颗粒的捕集效率,而气体流速的增大则会导致颗粒捕集效率降低.较低的气体流速有利于小颗粒的捕集,而较高的磁介质填充率对于大颗粒的捕集更为有利于.试验结果表明,采用高梯度磁分离控制燃煤可吸入颗粒物是一种新型有效的方法.更多还原

【Abstract】 Experiments on capturing PM10 emitted from coal combustion with high gradient magnetic field were carried out for the first time.The variation of particle number concentration caused by high gradient magnetic field was measured by the electrical low pressure impactor(ELPI).Effects of particle magnetization,magnetic flux density,aerosol velocity and fill ratio of ferromagnet media on particle capture efficiency have been systematically studied.The results show that,within the particle size of 0.1 to 10 μm,the particle capture efficiency ranges from 25% to 36%.For both big and small particles the capture efficiency are higher,and for the in-between particles(1 to 3 μm) the capture efficiency is relatively lower.The particle capture efficiency rises with the increase of particle magnetization, magnetic field gradient and fill ratio of ferromagnet media,and it reduces with the increase in aerosol velocity.Lower aerosol velocity provides an active effect on capturing fine particles and higher fill ratio of ferromagnet media has an active effect on capturing big particles.The present study indicates that adopting high gradient magnetic separation is an effective way to control fine particle emission from coal combustion.更多还原