滤料负载粉尘层对气态汞脱除性能的实验研究

Experimental study on properties of gaseous mercury removal by filter with dust layer

通过不同性能纤维滤料负载燃煤飞灰粉尘层,来模拟袋式除尘器滤袋表面粉尘附着层,进而研究袋滤器用不同性能纤维滤料和粉尘附着层对燃煤烟气中Hg0的联合脱除性能。在固定床实验系统上分别进行了不同纤维滤料和燃煤飞灰粉尘层,以及经实验优选得到的华博特滤料负载燃煤飞灰粉尘层脱除燃煤烟气中Hg0的实验研究。结果表明,燃煤飞灰粉尘层和华博特滤料对Hg0分别有一定的脱除作用,脱除效率可达35%和42.5%,它们对Hg0的脱除是物理吸附和化学吸附共同作用的结果;同时,华博特滤料负载燃煤飞灰粉尘层对Hg0的联合脱除效率受到吸附反应温度、入口汞浓度和烟气停留时间等因素的影响,最佳脱汞率可达64.4%;吸附反应温度越高,脱除效率越低;烟气停留时间越大,脱除效率越高;入口汞浓度的提高并不一定提高华博特滤料负载飞灰粉尘层的脱汞效果。

In this study,an imitating model of the bag filter fiber adsorbed the dust layer was proposed to investigate the combined properties of Hg0 removal in coal-fired flue gas by the bag filter and the dust,which attaches on the surface of the bag filter material.The experiment was test with a laboratory-scale packed bed reactor system.The measurement results indicated that both coal-fired fly ash dust layer and HBT filter material have certain ability to remove Hg0,the removal efficiencies are 35% and 42.5%,respectively.The removal process included physical adsorption and chemical adsorption.Removal efficiency of the HBT load coal-fired fly ash was mainly affected by adsorption temperature,initial concentration of mercury vapor and gas residence time and other factors,the highest removal efficiency was 64.4%.The higher the adsorption temperature,the lower the removal efficiency was.The longer gas residence time,the higher the removal efficiency was.Increasing the import mercury concentration is not necessarily improving the HBT fiber mixed fly ash dust filter removal effect for mercury.