气泡雾化喷嘴在受限空间雾化特性的实验研究

Experimental investigation of spray characteristic of effervescent atomization nozzle in confined space

为通过选择喷嘴与控制雾滴粒径解决细颗粒粉尘高效治理的问题.采用马尔文粒度分析仪(Spraytec)实验测定4只内气外液型气泡雾化喷嘴A1(Ф1.1 mm、Ф2=12 mm)、A2(Ф1.2 mm、Ф2=12 mm)、A3(Ф1=1.5 mm、Ф2=12 mm)、A4(Ф1=1.5 mm、Ф2=18 mm)的垂直雾化质量,分析了喷嘴孔径、气液比ALR、气体压力(P)、液体流量(ML)等参数分别对雾滴粒径SMD的影响规律.研究结果表明:随着ALR增加,SMD均呈减小趋势.A2与A3稳定性均优于A1与A4;其中,A2雾化SMD≤25μm,效果优于A3;随着P增加,SMD均呈减小趋势.ML≤400 kg/h,随着ML增加,A1、A2、A3雾化SMD均呈减小趋势,A4雾化SMD呈增大趋势;ML≥400 kg/h,A1、A2、A3、A4雾化SMD变化均呈规律性波动.研究结论为有效解决受限空间无组织排放细颗粒粉尘(1~10μm)的现实污染难题提供理论依据.

In order to realize high removal efficiency for control of fine particle dust, it was particularly important for high efficiency control of fine dust particles to choose reasonable nozzle and droplet diameter. Experimental investigation was carried out on four different inner gas external liquid type effervescent atomization nozzles A1(Ф1.1 mm, Ф2=12 mm), A2(Ф1.2 mm, Ф2=12 mm), A3(Ф1=1.5 mm, Ф2= 12 mm), A4(Ф1=1.5 mm, Ф2=18 mm)by using Malvern Spraytec droplet analyzer on the established experimental system for Spray Characteristic of effervescent atomization nozzle. The influence of the nozzle aperture, gas-liquid ratio ALR, gas pressure P, liquid flow rate ML and other main parameters on bubble atomized droplet size SMD were respectively analyzed. With the increase of ALR, SMD showed a trend of small droplets. The stability of nozzle A2 and A3 was better than that of nozzle A1 and A4. SMD of nozzle A2 were less than 25 μm. The atomizing effect of nozzle A2 was better than that of nozzle A3. The increase of gas pressure was helpful for decreasing droplet SMD. While ML≤400 kg/h, with the increase of liquid ML droplet SMD of nozzle A1, A2, A3 showed a decreasing trend and nozzle A4 showed increasing trend, while ML≥ 400 kg/h, droplet SMD of nozzle A1, A2, A3, A4 changes were all fluctuated regularly. Effervescent atomization experiment can provide data support for the effective solution of fine particle dust(1~10 μm) pollution problem in partially closed/semi closed confined space.