湿式弦栅水膜除尘试验研究及效率优化  

Experimental study and efficiency optimization on water film dust removal of wet chord grid

作　　者：王海桥 吴志荣 陈世强 王鹏飞 黄敏华 WANG Haiqiao;WU Zhirong;CHEN Shiqiang;WANG Pengfei;HUANG Minhua(School of Resource&Environment and Safety Engineering,Hunan University of Science and Technology,Xiangtan 411201,China;Hunan Mine Ventilation and Dust Removal Equipment Engineering Technology Research Center,Xiangtan 411201,China)

机构地区：[1]湖南科技大学资源环境与安全工程学院,湖南湘潭411201 [2]湖南省矿山通风与除尘装备工程技术研究中心,湖南湘潭411201

出　　处：《煤炭学报》2023年第1期279-289,共11页Journal of China Coal Society

基　　金：国家自然科学基金资助项目(U1361118);交通运输部交通运输行业重点科技资助项目(2021-MS5-126)。

摘　　要：为了探究湿式弦栅水膜净化细微粉尘的效率及优化方法,制备了平均粒径约为10μm的实验粉尘,借助自主搭建的实验平台开展了压力喷嘴雾化特性和湿式弦栅水膜除尘特性实验,研究了喷嘴雾化参数与除尘效率之间的因变关系,验证了增大供水压力和弦栅表面疏水改性能提高湿式弦栅水膜净化细微粉尘效率的可行性。结果表明:3种压力喷嘴的喷雾流量随着供水压力的增大而增大,雾化粒径随着供水压力的增大而减小。在风道风速为3 m/s的实验条件下,空心圆锥形喷嘴的雾化效果优于方锥形和实心圆锥形喷嘴,供水压力由0.3 MPa增大至1.3 MPa,喷雾流量和雾化角分别增大了1.19 L和5.2°,雾化粒径降低了44.1μm。湿式弦栅水膜的全尘除尘效率与压力喷嘴喷雾流量呈正相关,与雾化粒径呈负相关;选用空心圆锥形喷嘴的除尘效果最好,5种供水压力工况的湿式弦栅水膜全尘除尘效率依次为67.16%、68.56%、70.29%、73.80%、75.89%。湿式弦栅水膜除尘段阻力随着风道风速的增大线性增大,阻力系数为13.14。通过增大供水压力的方法优化除尘效率的效果并不显著,供水压力由0.7 MPa增大至1.3 MPa,湿式弦栅水膜的全尘除尘效率增大了6.63%,全尘除尘效率最高为81.57%。弦栅断面水膜填充率随着喷雾时间的增大呈先急剧增大、后缓慢降低、最终趋于稳定的变化规律。弦栅表面疏水改性后,弦栅断面水膜填充率由66%增大至78%,提高了湿式弦栅水膜净化细微粉尘的效率。6种供水压力工况下,全尘除尘效率依次为80.27%、84.53%、85.38%、87.00%、88.45%、90.58%;空气动力学当量直径为5、7.07和10μm的呼吸性粉尘,除尘效率可达82.68%、83.16%、86.31%。To understand the efficiency and optimization method of purifying fine particles with wet chord grid water film,the experimental dust with an average particle size of about 10μm was prepared.The pressure nozzle atomization characteristics experiment and wet chord grid water film dust removal characteristics experiment were conducted based on the self-built experimental platform.The variable relationship between the atomization parameters of pressure nozzle and dust removal efficiency was studied.The feasibility of increasing the water supply pressure and the chord grid surface hydrophobic modification to improve the efficiency of wet chord grid water film purifying fine particles was verified.The results show that the spray flow rate of the three kinds of pressure nozzles increases with the increase of water supply pressure,and the atomized particle size decreases as the water supply pressure increases.Under the experimental conditions that the air duct velocity is 3 m/s,the atomization effect of the hollow conical nozzle is better than that of the square conical and solid conical nozzles,the water supply pressure increases from 0.3 MPa to 1.3 MPa,the spray flow rate and atomization angle increase by 1.19 L and 5.2°,respectively,and the atomization particle size decreases by 44.1μm.The dust removal efficiency of wet chord grid water film dedusting is positively correlated with the spray flow rate of the pressure nozzles,and negatively correlated with the atomized particle size.The hollow cone has the best dedusting effect.The dedusting efficiency of the wet chord grid under five water supply pressure conditions is 67.16%,68.56%,70.29%,73.80%and 75.89%,respectively.The resistance loss of wet chord grid water film dust removal section increases linearly with the increase of the air duct velocity,and the resistance coefficient is 13.14.The effect of optimizing the dust removal efficiency by increasing the water supply pressure is not significant.The water supply pressure increases from 0.7 MPa to 1.3 MPa,the dust

关 键 词：喷雾 弦栅 水膜填充率 细微粉尘 除尘 表面改性 

分 类 号：TD714.4[矿业工程—矿井通风与安全]