喷射环流反应器内部过滤操作研究

Operating Performance of Draft Tube Filtrator within a Jet Loop Reactor

在传统喷射环流反应器中心设置以不锈钢粉末烧结滤芯为过滤介质的内置过滤器,实现在反应器内反应和液固分离同时进行及操作的连续化。考察过滤通量随时间变化及过滤压力、循环流量、表观气速、固相浓度对过滤通量的影响。结果表明：滤饼的形成和剥离可达到动态平衡,过滤通量基本维持恒定。过滤通量随过滤压力、循环流量的增大而增大：过滤压力增大2倍,过滤通量约增大80%;循环流量由0.51 L·s^-1增大到1.37 L·s^-1,过滤通量升高50%左右。而固相浓度（3.5%-7.3%）增大过滤通量却减小,但影响较弱,固相浓度加倍时,过滤通量减小20%。表观气速对过滤通量的影响较复杂,过滤通量随表观气速的增加先增大后减小。表观气速由0.025 m·s^-1增大到0.153 m·s^-1,过滤通量变化幅度在10%以内,其影响也较弱。

A filtration tube made of sintered stainless-steel-powder was installed vertically inside a jet loop reactor to fulfill continuous operation at same time with liquid-solid separation. The change of filtering rate with time and the effects of filtering pressure drop,liquid circulation velocity, superficial gas velocity as well as solid concentration on filtrating rate were investigated. Experimental results show that the build-up and disintegration of filter cakes could reach to a dynamic balance status, and the filtering rate keeps constant. Moreover, the filtration rate increases with the increase of filtration pressure and circulating velocity. The filtering rate increases by 80% when the filtering pressure increases for 2 times, and it increases by 50% when the liquid circulation velocity increases from 0.51 to 1.37 L·s^-1. The solid concentration has weaker effects on filtration rate, which decreases 20% when the solid concentration doubled. The influence of the superficial gas velocity is relatively complex, and the filtration rate increases and then decreases with the increase of superficial gas velocity. However, it varies within 10% when the superficial gas velocity changes from 0.025 to 0.153 m·s^-1.