静态螺旋切割强化臭氧液相传质研究

为解决臭氧在水中的溶解度低、应用受到限制的问题,开发了一种新型的变螺距的静态螺旋切割器,考察了臭氧气体流量、液体流量以及变螺距系数对强化传质效果的影响,并与常规曝气、循环气液喷射混合接触方式下的传质进行了对比。结果表明,在相同的时间内,液相O_3含量随着气液流量的增加而增加,变螺距系数m对于强化效果也有一定影响,采用螺距均匀变化的腔芯结构有助于臭氧在水中的溶解。采用新型螺旋切割器通气10 min后液相O_3的质量浓度可达16.2 mg/L,传质系数高达0.400 min^-1,是相同条件下常规曝气和循环气液喷射混合方式的9.5和7.0倍。采用变螺距螺旋切割装置强化臭氧在水中的传质,能够显著提高传质速率和传质效率。

Study on Enhancing Ozone Mass Transfer in Liquid Phase by Static Spiral Cutting

In order to solve the problem of low solubility of ozone in water which limit the application. A new type of variable-pitch static spiral cutter was developed, the effect of ozone gas flow rate, liquid flow rate and variable pitch coefficient on the enhancement efficiency of mass transfer was investigated,and mass transfer was compared with conventional aeration and recirculating gas-liquid jet mixing. The results showed that the content of O3 in liquid phase increased with the increase of gas-liquid flow rate at the same time, and the variable pitch coefficient had influence on the mass transfer. The cavity core with uniform change on pitch was helpful for the dissolution of ozone in water. After 10 min of ventilation by applying the spiral cutter, the mass concentration of ozone in liquid phase was 16.2 mg/L and the mass transfer coefficient could reach 0.400 min^-1, which was 9.5 and 7.0 times larger than that of conventional aeration and recirculating gas-liquid mixing under the same conditions respectively. Therefore using variable-pitch spiral cutter device to enhance ozone mass transfer in liquid phase can significantly increase the mass transfer rate and efficiency of mass transfer.