首页|水雾粒子特性对呼吸性粉尘降尘效率影响研究

水雾粒子特性对呼吸性粉尘降尘效率影响研究

Study of the effect of water mist particle characteristics on the dust reduction efficiency of respirable dust

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为有效去除工业生产中的呼吸性粉尘,提高水雾粒子对呼吸性粉尘的捕捉效率,基于三相流理论建立了高速气流中单颗粒雾-尘碰撞耦合数值模型.研究高速气流中单颗粒雾-尘碰撞耦合过程,分析雾-尘粒径比及相对速度对尘粒表面线积分润湿度的影响.结果表明,对于不同粒径等级的呼吸性粉尘,达到最佳润湿度对应的雾-尘粒径比不同,k(PM1)=15、k(PM2.5)=2 和 k(PM5)=1.在高速气流中雾-尘相对运动状态不同时,粉尘颗粒的最佳润湿度随雾-尘相对速度U增大而增大.搭建仿真试验模型,研究不同情况下水雾粒子的捕尘效率.结果表明,超音速雾化喷嘴对呼吸性粉尘的降尘效率为95.95％,单流体喷嘴降尘效率为82.98％.结合现场试验对比分析,验证雾-尘粒径比及相对速度对尘粒表面线积分润湿度的影响规律.结果表明,越符合粉尘粒子被捕捉的最佳粒径比的喷嘴的降尘效率越高,提高尘雾粒子碰撞速度可以提高对粉尘粒子的捕捉效率,为治理呼吸性粉尘及清洁化工业生产提供理论依据.
To effectively remove respirable dust in industrial production and improve the efficiency of water mist particles in capturing respirable dust,a numerical model of single-particle mist-dust collision coupling in high-speed airflow is established based on the three-phase flow theory.The effect of the mist-dust particle size ratio and relative velocity on the surface line integral wetting humidity of dust particles is analyzed.The study shows that for different particle size classes of respirable dust,the particle size ratios of fog to dust to achieve the optimum wetting humidity are different when the high-velocity aerosol acts with them.k(PM1)=15,k(PM2.5)=2 andk(PM5)=1,and the optimum dust-catching water mist is less than 15 μm.When the relative motion of mist-dust is different in the high-speed airflow,the optimum moisture of dust particles increases with the increase of the relative velocity U.A simulation model is built to study the dust capture efficiency of the water mist particles under different conditions and to compare and analyze the dust particle capture capacity of different particle sizes of the water mist particle field.The results show that the dust reduction efficiency of supersonic atomizing nozzles for respirable dust is 95.95％,the dust reduction eficiency of single fluid nozzles is 82.98％,and the dust reduction efficiency decreases by 1.38％by reducing the relative velocity of mist-dust particles under the same conditions.Combined with the comparative analysis of field tests,the influence law of the ratio of mist-dust particle size and relative velocity on the linear integral moisture of dust particle surface is verified.The results show that the better the optimal particle size ratio of the nozzle is,the higher the dust removal efficiency is.Increasing the collision velocity of dust particles can improve the capture efficiency of dust particles and lay a theoretical foundation for the treatment of respirable dust and clean industrial production.

safety and hygiene engineering technologysingle particle collisionrespirable dustnumerical simulationdust reduction efficiency

荆德吉、马纪闯、张天

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辽宁工程技术大学安全科学与工程学院,辽宁阜新 123000

矿山热动力灾害与防治教育部重点实验室(辽宁工程技术大学),辽宁阜新 123000

安全卫生工程技术 单颗粒碰撞 呼吸性粉尘 数值模拟 降尘效率

国家自然科学基金青年基金项目辽宁省自然科学基金项目2022年辽宁省自然科学基金计划项目(博士启动项目)

517041462020-MS-3042022-BS-331

2024

10.13637/j.issn.1009-6094.2022.2581

安全与环境学报
北京理工大学 中国环境科学学会 中国职业安全健康协会

安全与环境学报

CSTPCD北大核心
影响因子：0.943
ISSN：1009-6094
年,卷(期)：2024.24(1)
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