【摘要】 利用流化床气溶胶发生器分别产生2种不同磁特性的燃煤可吸入颗粒物,在高梯度磁场试验装置中通过添加γ-Fe2O3进行了可吸入颗粒物脱除的实验研究.结果表明,γ-Fe2O3对高梯度磁场中提高可吸入颗粒物的脱除效率有一定的促进作用.当γ-Fe2O3的添加量为0.003~0.012 g/g(飞灰)时,2种可吸入颗粒物的总脱除效率提高了20%~50%不等,并且γ-Fe2O3对饱和磁矩较大样品的脱除效率促进作用较大;可吸入颗粒物脱除效率随外加磁场、磁介质填充率、磁种与飞灰质量比的增加而增大;磁场开启后,可吸入颗粒物脱除效率的变化可分为缓慢提高、快速提高和稳定3个阶段.更多还原

【Abstract】 On the cold-state test facility with a fluidized bed aerosol generator and a removal system in high gradient magnetic field,an experimental study of capturing two kinds of fine fly ash particles was conducted.The electrical low pressure impactor was used to measure the particle number concentrations.Experiment results indicate that adding γ-Fe2O3 can promote fine particle removal efficiency.When the mass flow of γ-Fe2O3 is 0.003～0.012 g/g(fly ash),the removal efficiency increases by 20%~50%.When adding γ-Fe2O3,the higher the saturated particle magnetization of the fly ash particles,the more visible the promotion effect of γ-Fe2O3 on particle removal efficiency is.The particle removal efficiency increases with the increase in the magnetic flux density,the fill ratio of magnet medium and the quality ratio of γ-Fe2O3 to the fly ash,respectively.Once the fine particles flow into the high gradient magnetic field,the particle removal efficiency experiences slow-increase stage,fast-increase stage and steady stage during the initial time.更多还原