协同团聚强化捕集转炉烟气微细粉尘方法研究

Study on the method of synergistic agglomeration to enhance the capture of fine dust from converter flue gas

针对目前钢铁冶炼过程以细颗粒物(PM_(2.5))、可吸入颗粒物(PM 10)为主的微细粉尘捕集效率较低的难题,研究采用化学与扰流协同团聚技术对钢铁转炉烟气中的微细粉尘进行预处理,进而提高捕集效率。采用单因素实验探究了扰流柱的纵向和横向距离、烟气流速及团聚剂浓度对微细粉尘脱除的影响规律,并考察了化学与扰流协同作用对微细粉尘的捕集效果。结果表明,采用“V”形与圆形扰流柱交错排列方式,当扰流柱纵向距离为8 cm、横向距离为6 cm,烟气流速为9 m/s,团聚剂质量浓度为1.00 g/L时,PM_(2.5)和PM 10的捕集效率分别可达到88.69%和93.32%。化学与扰流协同团聚作用可有效强化微细粉尘颗粒的碰撞、捕捉和黏附,进而提高捕集效率。

Fine dust mainly containing PM_(2.5)and PM 10 in iron and steel smelting process is difficult to be removed at present.In order to improve the dust capture efficiency,the chemical and turbulent co-agglomeration method was used to pretreat the fine dust in the converter flue gas of iron and steel.In the single-factor experiment,the influence of the longitudinal distance,the transverse distance,the smoke velocity and the concentration of the agglomerant of the spoiler column on the removal of fine dust was studied.And the removal effect of fine dust by the synergism of chemistry and turbulence was investigated.The results showed that the capture efficiency of PM_(2.5)and PM 10 could reach 88.69%and 93.32%respectively when the staggered arrangement of“V”-shaped spoiler and circular spoiler was adopted,the longitudinal distance of spoiler was 8 cm,the transverse distance was 6 cm,the smoke velocity was 9 m/s,and the mass concentration of agglomerant was 1.00 g/L.Synergistic agglomeration of chemistry and turbulence could effectively strengthen the collision,capture and adhesion of fine dust particles,thus the capture efficiency was improved.