Study On The Effect Of Pulse Injection Pressure On The Permeability Of Filter Bag

In recent years,the public has paid special attention to air pollution.Reducing the concentration of PM2.5 in the atmosphere has become a research hotspot.The dust collector has been developed rapidly as the main equipment for purifying industrial waste gas.Among them,the pulse bag dust collector is widely used in various industries.The pulse bag filter has a simple structure,can filter fine dust,is stable and inexpensive,but when it was just put into use,due to the high permeability of the clean filter bag,the filtration efficiency of the dust particles contained in the industrial exhaust gas Low,even some fine dust can be directly discharged into the atmosphere through the filter medium.Clean filter bags often need to be used for a long period of time before their permeability gradually drops to the rated value.In previous studies at home and abroad,only the value of a certain parameter was changed to improve the dust removal efficiency of the dust collector,and the interaction between the parameters was ignored.This paper simulates the formation process of the powder cake layer on the surface of the filter bag and the dust removal process of the dust removal unit.The obtained data was subjected to multiple linear regression analysis using MATLAB software,and a solution to the dynamic regression equation was established to make the filter medium permeability quickly reach the rated value.Indirectly improve the dust removal efficiency.Ways to improve dust removal efficiency.The main research contents are as follows:a.SolidWorks software was used to construct a simplified model of the surface of the filter bag,which was then imported into MESH for mesh division.The CFD-DEM coupling calculation method was used to simulate the accumulation process of dust on the surface of the filter bag at the micro level.In the UDF of the FLUENT software,an interface connecting the two softwares is established for data interaction,the movement of the particle phase is calculated in EDEM,and the movement of the fluid phase is calculated in FLUENT.The formation of the powder cake layer on the surface of the filter bag is described at the micro level process,The influence of the dust cake layer on the dust removal efficiency and the internal pressure of the dust removal system was analyzed.b.Establish a model of dust removal unit in ICEM and divide the grid,by using the FLUENT software to simulate the dust removal process of the dust removal unit of the pulse bag filter several times by changing the value of relevant parameters,Use the data calculated by FLUENT software to establish data samples,In MATLAB software,it is subjected to multiple linear regression analysis,and the regression equations of the pressure difference between the two sides of the filter medium and related parameters are obtained,and combined with the actual measurement formula of the pressure difference between the two sides of the filter medium and the filter medium permeability formula,the simultaneous solution The reasonable value of the injection pressure at the nozzle is obtained.By controlling the size of the injection pressure,the permeability of the filter medium is adjusted,so that the permeability of the filter medium can reach the rated value of the work in a shorter time,which indirectly improves the dust removal efficiency of the dust removal system.The research in this paper provides a feasible solution for reducing the permeability of the filter bag of the pulse bag filter.This method can not only improve the dust removal efficiency,but also avoid the waste of resources and save operating costs,which has certain practical significance.