基于“液包气”雾化的脱硫喷嘴特性实验

Experimental Study on Spray Characteristics of a Gas-outside Liquid-inside Atomizer

在一种内置拉法尔气体喷管两相流"液包气"喷嘴的设计基础上,搭建了多相雾化实验台,进行了喷嘴雾化性能实验,研究了气液质量比(w)对喷嘴雾化颗粒粒径分布均匀性、索特尔平均雾化直径、雾化角等性能指标的影响,推导出"液包气"喷嘴液气压力比和气液质量比的经验公式及适用范围,得到了内置拉法尔喷管两相流"液包气"喷嘴气液质量比的临界点为0.057.结果表明:液气压力比随着w的增大而减小;当w=0.057时,液气压力比为0.92;气体流量系数与气液质量比呈反比关系;"液包气"喷嘴单相雾化效果远差于两相时的雾化效果,且随着喷嘴液相压力的提高,雾化效果变好,但压力对雾化效果的影响越来越弱.

On the design basis of a gas-outside liquid-inside atomizer with built-in Rafael air nozzle, an experimental setup has been built up to study the liquid atomization in multi-phase flows, analyze the influence of gas-liquid mass ratio on the atomized particle size distribution, Sauter mean diameter and spray cone angle, etc. , and therefore deduce the formula between the liquid-air pressure ratio and the air-liquid mass ratio, with which the critical air-liquid mass ratio is found to be 0. 057. Results show that the liquid- air pressure ratio increases with reducing air-liquid mass ratio; when the air-liquid mass ratio is 0. 057, the corresponding liquid-air pressure ratio is 0.92; the air flow coefficient has an inverse relationship with the air-liquid mass ratio. The atomization effect under single-phase condition is far below the two-phase condi- tion, which increases with rising liquid pressure; however the enhancement of liquid pressure weakens gradually on the atomization performance.