多因素对内混式气动雾化喷头雾化及降尘特性影响  

Influence of various factors on the atomization and dust suppression characteristics of internal mixing pneumatic atomization nozzles

作　　者：佟林全 郭雨浩 贾鑫 雷淼 时达明 张天 TONG Linquan;GUO Yuhao;JIA Xin;LEI Miao;SHI Daming;ZHANG Tian(College of Safety Science and Technology,Liaoning Technical University,Fuxin 123000,Liaoning,China;Key Laboratory of Mine Thermodynamic Disasters and Control of Ministry of Education,Fuxin 123000,Liaoning,China;National Center for Occupational Safety and Health,National Health Commission,Beijing 102308,China;Key Laboratory for Engineering Control of Dust Hazard,National Health Commission,Beijing 102308,China)

机构地区：[1]辽宁工程技术大学安全科学与工程学院,辽宁阜新123000 [2]矿山热动力灾害与防治教育部重点实验室,辽宁阜新123000 [3]国家卫生健康委职业安全卫生研究中心,北京102308 [4]国家卫生健康委粉尘危害工程防护重点实验室,北京102308

出　　处：《安全与环境学报》2024年第12期4724-4733,共10页Journal of Safety and Environment

基　　金：国家自然科学基金(青年)项目(52204216);中国博士后科学基金(面上项目)(2022M711456);国家卫生健康委粉尘危害工程防护重点实验室开放基金项目(KLECDH20230101);辽宁省自然科学基金计划(博士启动项目)(2022-BS-331)。

摘　　要：为了掌握内混式气动雾化喷嘴喷雾特性及降尘性能,借助自主研发的雾化角及内混式气动雾化雾滴粒径测试平台和尘雾耦合试验平台,对内混式气动雾化喷头雾化特性与降尘特性进行了实测及分析。结果表明,在气动压力为0.2~0.4 MPa、水流量为10~16 L/h的情况下,内混式气动雾化雾滴体积中值粒径(V_(50))和索特尔平均直径(Sauter Mean Diameter,SMD)均随着气动压力的增大而减小,随着水流量的增大而增大,且气动压力对内混式气动雾化雾滴粒径的影响比水流量对雾滴粒径的影响更大。粉尘运动速度在1~3 m/s范围内,气雾运动速度分别为2~5 m/s、>5~11 m/s时,内混式气动雾化雾滴粒径分别在>40~50μm处、>30~40μm处取得最大降尘效率。设定气雾运动速度为>8~11 m/s、粉尘运动速度为1 m/s,并使雾滴粒径SMD大致均匀地在20~40μm范围内分布,则可以较好地与0~50μm内各粒径区间的粉尘耦合沉降,且降尘效率最高。研究为内混式气动雾化技术在粉尘耦合领域提供了理论基础和试验支撑。To investigate the spray characteristics and dust reduction performance of internal-mix pneumatic atomizing nozzles,we measured their atomization and dust suppression capabilities using an independently developed test platform.This platform assesses atomization angle and droplet size,as well as coupling tests for dust and mist.The test results were analyzed to elucidate the effects of the volume median diameter(V 50)and Sauter Mean Diameter(SMD)of internal-mix pneumatic atomizing droplets on pneumatic pressure and water flow rate.We also summarized the corresponding droplet size range for internal-mix pneumatic atomization that maximized dust reduction efficiency at various aerosol movement speeds.Additionally,we established a general trend regarding dust reduction efficiency across different aerosol velocities,along with the relationship between dust movement speed and droplet size(SMD).We summarized the relationships among dust movement speed,dust size,and the SMD of internal-mix pneumatic atomizing droplets in order to achieve optimal coupling effects.The results indicate that,within a pneumatic pressure range of 0.20.4 MPa and a water flow rate of 1016 L/h,both the V 50 and SMD of the internal mixing pneumatic atomization decrease as pneumatic pressure increases,while they increase with rising water flow rate.Furthermore,the impact of pneumatic pressure on droplet size is more significant than that of water flow rate.When the dust movement speed ranges 13 m/s,and the aerosol movement speeds are between 25 m/s and>511 m/s,the droplet size of internal mixing pneumatic atomization achieves maximum dust removal efficiency at>4050μm and>3040μm,respectively.Additionally,dust removal efficiency increases with larger SMD droplets,demonstrating a consistent overall trend of increasing and decreasing efficiency.At an aerosol velocity of 25 m/s,dust reduction efficiency exhibits a“decrease-increase-decrease”pattern with increasing SMD of the droplets.At aerosol velocities of>58 m/s,the trend generally shifts to an

关 键 词：安全卫生工程技术 内混式喷头 雾化特性 尘雾耦合 降尘效率 

分 类 号：X936[环境科学与工程—安全科学]