表面活性剂底喷填料塔的氯化铵微粒脱除增效作用

Enhancement effect of ammonium chloride particles removal efficiency of bottom spray packed tower based on surfactant

为高效去除微细颗粒物和减少水雾排放,设计了一种底喷式填料塔,利用表面活性剂能降低水的表面张力的原理,对比分析饮用水、SDBS、AEO-9、A-7对粒径小于1μm的氯化铵微粒的净化效果。结果表明,当底喷填料塔入口氯化铵微粒质量浓度为124.9~194.3 mg·m-3时,饮用水洗涤液的微粒脱除效率仅在40%左右,出口氯化铵微粒质量浓度>70 mg·m-3;当采用SDBS和AEO-9表面活性剂洗涤液后,微粒脱除效率大幅提高。AEO-9的提效作用较明显,当AEO-9浓度增至0.004%时,脱除效率达到74.8%,氯化铵微粒出口浓度为26.5 mg·m-3;当采用浓度为0.3%的A-7洗涤液时,脱除效率为89%,此时氯化铵微粒出口浓度仅为15 mg·m-3。通过分析可知,表面活性剂洗涤液对微细颗粒物的脱除有提效作用。

In order to efficiently remove fine particles and reduce water mist emissions, a bottom spray type packed tower was designed. According to the principle of reducing water surface tension with the surfactant, the purification effects of drinking water, SDBS, AEO-9, A-7 on ammonium chloride particles with particle size less than 1 μm were compared and analyzed. The results showed that when the mass concentration of ammonium chloride particles at the inlet of the bottom spray packed column was 124.9~194.3 mg·m-3, the particle removal efficiency by the drinking water washing liquid was only about 40%, and the mass concentration of the ammonium chloride particles at the outlet was higher than 70 mg·m-3. When SDBS or AEO-9 surfactant washing liquid was used, the particle removal efficiency was greatly improved. The enhancement effect of efficiency by AEO-9 was more obvious. When the concentration of AEO-9 increased up to 0.004%, the removal efficiency reached 74.8%, and the concentration of the ammonium chloride particles at the outlet was 26.5 mg·m-3. When A-7 washing liquid with concentration 0.3% was used, the removal efficiency was 89%, and the concentration of the ammonium chloride particles at the outlet was only 15 mg·m-3. Through above analysis,the surfactant washing liquid had an enhancement effect on the removal of fine particles.