| Due to the needs of China’s economic development,prompting China’s industrial scale is huge,resulting in more serious pollution of the air in recent years.Industrial production of fine dust and smoke is the main cause of damage to atmospheric air quality,causing urban haze,but also damage to the health of workers leading to occupational diseases,the problem of fine dust purification management has become the focus of attention of the industrial sector and society as a whole,the study of fine dust reduction technology is necessary.The dust removal system used in this paper is a venturi electrostatic water film dust removal system,which is a comprehensive composite dust removal system designed by combining multiple dust reduction mechanisms of venturi,vibrating string grids and electrocyclone,and its dust reduction performance and configuration optimization are studied experimentally by using a homemade dust reduction device.Through the theoretical analysis of the dust reduction system,two corona electrode structures suitable for the structural characteristics of the device were optimized using the step-by-step experimental method,and then the optimal electrode was selected using the experimental comparison analysis method with the electrode electric field characteristics as the evaluation index,and the dust reduction effect when the electrode and water film are combined was studied.On this basis,single-factor tests were conducted on four factors,namely,inlet wind speed,corona electrode discharge voltage,throat spray volume,and number of vibrating string grating,to study their effects on the dust reduction performance of the device.According to the single-factor test,three levels of each factor were selected for the orthogonal test to obtain the optimal configuration of the synergistic effect of each factor.The experimental analysis shows that the optimized electrode has excellent discharge performance and has high dust reduction efficiency after the integrated action with water film.The analysis of single-factor test results shows that the dust reduction efficiency of the dust reduction system increases with the increase of wind speed and then decreases;the increase of dust reduction efficiency at low wind speed after adding electric field is large,and the increase of dust reduction effect at high wind speed is small,and the increase of spray volume and vibrating fence increases the dust reduction efficiency.In the resistance test results,it is shown that the increase of inlet wind speed,spray volume and vibrating fence will increase the resistance of dust reduction system.After the analysis of the orthogonal test results by variance and extreme difference,it is concluded that the influence on dust reduction efficiency is in the order of significance: inlet air speed > working voltage > number of vibrating grids > spray volume,and the influence on resistance is in the order of significance: inlet air speed > number of vibrating grids > spray volume.The main factors affecting the dust removal efficiency are wind speed and voltage,and the main factor affecting the resistance is wind speed.The best combination of all factors is 6.4m/s inlet air speed,2 vibrating grids,40 k V corona voltage,2.88L/min spray volume,and 99.18% dust removal efficiency and 772.34 Pa resistance,and the relationship between inlet average dust concentration and dust removal efficiency is tested under the optimal configuration,and the results show that it has less influence on dust removal efficiency.The results show that it has a small effect on the dust reduction efficiency.According to the theoretical analysis and test results,the composite dust reduction technology is a highefficiency dust reduction technology,with high dust reduction efficiency for fine dust,easy dust cleaning and effective prevention of secondary dust emission,which will have a good prospect in the future application of industrial dust reduction technology. |
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