主办单位：煤炭科学研究总院有限公司、中国煤炭学会学术期刊工作委员会
Experimental study and efficiency optimization on water film dust removal of wet chord grid
WANG Haiqiao,WU Zhirong,CHEN Shiqiang,WANG Pengfei,HUANG Minhua
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 10 μm 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 44.1 μm。 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 10 μm 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 10 μm was prepared. The pressure nozzle atomiza- tion 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 pres- sure 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. Un- der 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 par- ticle size decreases by 44.1 μm. The dust removal efficiency of wet chord grid water film dedusting is positively corre- lated with the spray flow rate of the pressure nozzles,and negatively correlated with the atomized particle size. The hol- low cone has the best dedusting effect. The dedusting efficiency of the wet chord grid under five water supply pres- sure 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 coeffi- cient is 13.14. The effect of optimizing the dust removal efficiency by increasing the water supply pressure is not signif- icant. The water supply pressure increases from 0.7 MPa to 1.3 MPa,the dust removal efficiency of the wet chord grid water film increases by 6.63%,and the highest dust dedusting is 81.57%. With the increase of spray time,the water film filling ratio of chord grid section increases sharply at first,then decreases slowly,and finally tends to be stable. Af- ter the hydrophobic modification of the chord grid surface,the water film filling ratio of the chord grid section increases from 66% to 78%,the efficiency of the wet chord grid water film purifying fine dust is improved. Under the six experi- mental conditions of the water supply pressure,the total dust removal efficiency is 80.27%,84.53%,85.38%,87.00%, 88.45% and 90.58%,respectively. The dust removal efficiency of respirable dust with aerodynamic equivalent diame- ters of 5,7.07 and 10 μm can reach 82.68%,83.16% and 86.31%,respectively.
spray; chord grid; water film fill rate; fine particles; dust removal; surface modification
1 湿式弦栅水膜除尘机理
2 实验平台、仪器及实验方案
2.1 实验平台
2.2 实验器材及材料
2.3 实验方案
3 实验结果及分析
3.1 喷嘴雾化特性
3.2 除尘性能实验结果及分析
3.3 弦栅断面水膜填充率的量化
3.4 除尘效率优化实验结果及分析
4 结论
图(14) / 表(0)
主办单位：煤炭科学研究总院有限公司 中国煤炭学会学术期刊工作委员会
煤炭学报 
2023年第01期 
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