Optimization Study On The Distribution Of Pulse Blowing Cleaning Airflow Of The Injection Pipe

In recent years,the cartridge dust collector has been widely used in the field of powder preparation and industrial dust removal due to its high efficiency,but the flow characteristics of high-pressure pulse airflow lead to some shortcomings in the operation of its pulse-blowing cleaning system.Among them,the problem of uneven cleaning of multi-nozzle has a large impact on the filtration efficiency and service life of the cartridge,mainly because different nozzles of the same blowing pipe blow the cartridge with different cleaning intensity,and research has shown that the current design method of the blowing pipe based on experience rather than theory cannot achieve the effect of the average distribution of airflow,which is the direct cause of the uneven cleaning of multi-nozzle.To solve this problem,based on the guiding idea of uniform distribution of airflow inside the dust collector blowpipe,an optimization model d_j=D（Cm/nm_j）^1/2was established with a five-nozzle equal diameter blowpipe as an example,and the model was used to optimize the design size of the blowpipe,whose nozzle diameter was revised from 15mm to 17,16,15,14,14mm and verify the effect,and finally the optimization model system was applied to the standardized design of different sizes of the blowpipe.The main conclusions are as follows:（1）The results of the peak pressure measurements on the side walls of the cartridges were used to characterize the optimization effect of the five cartridges’blowing intensity and airflow rate.The experiments showed that the composite cleaning pressures of the five cartridges before optimization were 412,652,816,1057,and 1253Pa,with a maximum difference of more than 800Pa.After optimization,the composite cleaning pressures were819,978,889,969,and 1108Pa,with a significant reduction in volatility and a maximum difference of only 300Pa.（2）For the first time,the airflow mass was proposed as a criterion to measure the effect of airflow cleaning and provided a new technique for the measurement of high-speed and high-pressure pulse airflow.The measured values of airflow mass of the five nozzles before optimization were 0.0156,0.0176,0.0196,0.0211,and 0.0213kg,with a deviation of 36.54%,while the measured values after optimization were 0.0194,0.0194,0.0205,0.0208 and0.0206kg,with a deviation of 7.22%,and the uniformity was improved by five times.（3）The experiments were verified with CFD numerical simulations of the internal flow field of the nozzle.The airflow masses before optimization were obtained as 0.015,0.017,0.019,0.021,and 0.023kg,with a deviation of 53.33%,and the optimized masses were0.0201,0.020,0.0195,0.019,and 0.0185kg,with a deviation of 8.60%,the simulation results were basically the same as the experimental measurements.（4）The corrected size of each common blowpipe nozzle diameter was calculated according to the optimization process.Not optimizing the 18 blowpipes to follow the design principles of equal diameter nozzle to get the relative deviation of airflow masses of 28.2%～72%,after optimization of the relative deviation of airflow masses of 4.4%～16%,the deviation decreased by at least four-fifths,this result meets the requirements of multi-nozzle pulse uniform blowing,can be used as a design standard.Therefore,all experimental results show that the optimization model is reasonable and effective,and achieves the research goal of evenly distributing the pulse jet airflow inside the nozzle,the accuracy of the experiments can be mutually verified,and the design criteria have reference values and can be applied to industrial production.