摘要
喷雾降尘是工业粉尘治理的常规技术手段,传统喷雾降尘技术存在降尘效率低、耗水量大及无法实现远距离降尘等缺陷。通过提出一种新型组合式喷雾降尘装置,并基于自行设计的气水喷雾试验平台,对该新型装置气流场分布规律、雾化粒度的空间分布规律以及相关影响因素开展试验研究。结果显示:组合式喷雾降尘装置能够将喷雾吹送至较远的降尘区域,实现远距离降尘,且装置尾部可抽吸周围含尘气体,与雾滴一并喷出,达到二次降尘效果;随着供气压力的增加,组合式喷雾降尘装置的喷雾速度呈幂函数形式增大,随着与喷口处距离的增加,装置喷雾速度自出口沿下游呈指数函数形式衰减;负压随着供气压力的增大而增大,装置尾部产生的吸气量随供气压力的增加而不断增大;随着供气压力的增加,装置的射程不断增大,增大供水压力对装置射程的提升较小;雾滴粒径随着供气压力的增加呈先增大后减小的趋势,且沿轴线方向上的不同位置的雾滴粒径呈相同的变化规律;当供气压力一定时,装置的雾滴粒径随供水压力的增加而减小。综合考虑,组合式喷雾降尘装置在现场应用时,供气压力和供水压力分别为0.4 MPa和2.0 MPa时较为合理。
Spray dust reduction is a conventional technical means of industrial dust control.The traditional spray dust reduction technology has the defects of low dust reduction efficiency,large water consumption,and inability to achieve long-distance dust reduction.In this study,a new type of combined spray dust suppression device was proposed.Based on the self-designed gas-water spray experimental platform,the airflow field distribution law,the spatial distribution law of atomization particle size,and related influencing factors of the new device were experimentally studied.The results show that the combined spray dust reduction device can blow the spray to a distant dust reduction area to achieve long-distance dust reduction.The tail of the device can suck the dust-containing gas around it and spray it with the droplets to achieve the secondary dust reduction effect.With the increase of gas supply pressure,the velocity of the combined spray dust suppression device increases in the form of a power function.With the increase of distance,the velocity of the device decreases exponentially from the outlet along the downstream.The negative pressure increases with the increase of the gas supply pressure,and the amount of suction generated at the tail of the device increases with the increase of the gas supply pressure.With the increase of gas supply pressure,the range of the device continuously increases,and the increase of water supply pressure has little effect on the range of the device.The droplet size increases first and then decreases with the increase of air supply pressure,and the droplet size at different positions along the axis direction shows the same change rule.When the air supply pressure is constant,the droplet size of the device decreases with increasing the water supply pressure.Considering comprehensively,when the combined spray dust suppression device is applied in the field,the gas supply pressure and water supply pressure are 0.4 MPa and 2.0 MPa respectively,which is more reasonable.
作者
刘荣华
朱必勇
莫世途
王鹏飞
陈世强
LIU Ronghua;ZHU Biyong;MO Shitu;WANG Pengfei;CHEN Shiqiang(School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,Hunan,China;Changsha Mining Research Institute Co.,Ltd.,Changsha 410012,China)
出处
《安全与环境学报》
CAS
CSCD
北大核心
2024年第5期1749-1757,共9页
Journal of Safety and Environment
基金
国家自然科学基金项目(52274197)
湖南省自然科学基金项目(2021JJ30266)
湖湘青年英才项目(2021RC311)。
关键词
安全工程
喷雾降尘
工业防尘
雾滴粒径
供气压力
供水压力
safety engineering
spray dust
industrial dust prevention
droplet size
air supply pressure
water supply pressure
