用水和压缩空气在常压下对气泡雾化喷嘴进行冷态试验,研究了水平喷射时气泡雾化喷嘴雾化流中粒子分布的特征以及气液质量百分比(气液比)对粒子分布的影响。结果表明,气泡雾化和气动雾化过程雾化流中粒子的分布存在明显不同,气动雾化过...用水和压缩空气在常压下对气泡雾化喷嘴进行冷态试验,研究了水平喷射时气泡雾化喷嘴雾化流中粒子分布的特征以及气液质量百分比(气液比)对粒子分布的影响。结果表明,气泡雾化和气动雾化过程雾化流中粒子的分布存在明显不同,气动雾化过程大颗粒集中在雾化流的中心部位,而气泡雾化过程的大颗粒集中在雾化流的中下部位。气泡雾化喷嘴雾化过程雾化流中粒子分布与粒子的体积分布存在很大的差异,在试验条件下,粒子分布有着近似正态分布的特征,峰值在50μm附近;粒子体积分布的峰值后移,峰值在75μm以上,且大颗粒的体积分数远大于大颗粒数目所占的分数,更能体现喷嘴的雾化效果。提高气液比改善雾化效果不仅体现在平均粒径的大小,更重要的在于对粒子分布产生的影响,气液比提高时,小颗粒和大颗粒所占的体积分数减小,雾化流的分布更好。在SMD(Sauter Mean Diameter)约为70μm,进水量适中(400 kg/h)时,雾化流可以取得较好的粒子体积分布。展开更多
A novel cathodic–anodic-electrolysis packing（CAEP） used in the treatment of pyridine wastewater was researched, which mainly consisted of 4,4′-diamino-2,2′-disulfonic acid（DSD acid） industrial iron sludge. The ...A novel cathodic–anodic-electrolysis packing（CAEP） used in the treatment of pyridine wastewater was researched, which mainly consisted of 4,4′-diamino-2,2′-disulfonic acid（DSD acid） industrial iron sludge. The physical properties and morphology of the packing were studied. The CAEP was used in a column reactor during the pretreatment of pyridine wastewater. The influence of p H, hydraulic retention time（HRT）, the air–liquid ratio（A/L）and the initial concentration of pyridine were investigated by measuring the removal of total organic carbon（TOC） and pyridine. The characterization results showed that the bulk density, grain density, water absorption percentage and specific surface area were 921 kg/m3,1086 kg/m3, 25% and 29.89 m^2/g, respectively; the removal of TOC and pyridine could reach50% and 58% at the optimal experimental conditions（p H = 3, HRT = 8 hr, A/L = 2）. Notably,the surface of the packing was renewed constantly during the running of the filter, and the handling capacity was stable after running for three months.展开更多
文摘用水和压缩空气在常压下对气泡雾化喷嘴进行冷态试验,研究了水平喷射时气泡雾化喷嘴雾化流中粒子分布的特征以及气液质量百分比(气液比)对粒子分布的影响。结果表明,气泡雾化和气动雾化过程雾化流中粒子的分布存在明显不同,气动雾化过程大颗粒集中在雾化流的中心部位,而气泡雾化过程的大颗粒集中在雾化流的中下部位。气泡雾化喷嘴雾化过程雾化流中粒子分布与粒子的体积分布存在很大的差异,在试验条件下,粒子分布有着近似正态分布的特征,峰值在50μm附近;粒子体积分布的峰值后移,峰值在75μm以上,且大颗粒的体积分数远大于大颗粒数目所占的分数,更能体现喷嘴的雾化效果。提高气液比改善雾化效果不仅体现在平均粒径的大小,更重要的在于对粒子分布产生的影响,气液比提高时,小颗粒和大颗粒所占的体积分数减小,雾化流的分布更好。在SMD(Sauter Mean Diameter)约为70μm,进水量适中(400 kg/h)时,雾化流可以取得较好的粒子体积分布。
基金supported by the Tai Shan Scholar Foundation(No.ts201511003)
文摘A novel cathodic–anodic-electrolysis packing（CAEP） used in the treatment of pyridine wastewater was researched, which mainly consisted of 4,4′-diamino-2,2′-disulfonic acid（DSD acid） industrial iron sludge. The physical properties and morphology of the packing were studied. The CAEP was used in a column reactor during the pretreatment of pyridine wastewater. The influence of p H, hydraulic retention time（HRT）, the air–liquid ratio（A/L）and the initial concentration of pyridine were investigated by measuring the removal of total organic carbon（TOC） and pyridine. The characterization results showed that the bulk density, grain density, water absorption percentage and specific surface area were 921 kg/m3,1086 kg/m3, 25% and 29.89 m^2/g, respectively; the removal of TOC and pyridine could reach50% and 58% at the optimal experimental conditions（p H = 3, HRT = 8 hr, A/L = 2）. Notably,the surface of the packing was renewed constantly during the running of the filter, and the handling capacity was stable after running for three months.
