Performance Optimization Of Rectangular Flat Pleated Filter For Dust Cleaning Of Pulse-jet Cartridge Filter

The new rectangular flat pleated filter dust collector has a small footprint and is suitable for dust removal in limited local space.However,in actual industrial applications,it has been found that during pulsed dust cleaning,the pressure distribution on the top of the filter cartridge is uneven,resulting that dust accumulation is serious.So the development of the rectangular flat pleated filter is limited.Therefore,in this paper,rectangular flat pleated filter was taken as the research object.On the basis of the research on the circular filter cartridge and the filter bag,a new type of slit-nozzle was designed.And it adopted three methods:theoretical research,numerical simulation and industrial test.Through the existing pulse spraying test bench,under the slit-nozzle and the circular-nozzle,the jet distance and the tank pressure were adjusted,and the piezoelectric pressure sensor was used to test the pressure peak on the surface of the filter cartridge under different dust cleaning parameters.The applicable dust cleaning parameters of the cartridge and the force change law on the surface of the filter cartridge were obtained.Under the circular nozzle: the optimum distance was 20mm;and the pressure difference between the point p4 and the point p1 was 1000Pa(the pressure measurement point p1 was located on the non-positive pulse airflow and point p4 was located on the positive pulse airflow).Under the slit-nozzle,the applicable distance was 20-40mm;the pressure difference between the measuring points on the same horizontal line was small,such as the pressure difference between the measuring points p1 and p4 was about 300 Pa.The pressure of measuring points far from the air bag was greater than that near the air bag.The FLUENT numerical simulation method was used to simulate the velocity field inside the filter cartridge,the static pressure distribution field on the surface of the filter cartridge,and the dynamic pressure distribution diagram under the two different nozzles.The results show that the static pressure of the measuring point between the two air flows under the circular nozzle was the lowest,which was consistent with the conclusion of the pulse injection test under the same conditions.The slit-nozzle had a wide coverage of jet airflow,slow decay speed,and more uniform pressure distribution on the surface of the filter cartridge.In the industrial test,The pressure difference transmitter and electronic scale were used to measure the resistance of the dust collector system and the residual amount of dust under different operating conditions.By changing the parameters such as the distance,filtration velocity,the dust mass concentration and the pulse pressure,it was verified that the cleaning dust effect of the slit-nozzle was better than that of the circular nozzle.The effect of theoperating parameters on the cleaning effect of the filter cartridge under the slit-nozzle: For a single flat square filter cartridge,when the jet distance was?40mm,the system resistance and dust residue under the slit nozzle were smaller than those of the circular nozzle,and when the jet distance was> 40 mm,the conclusion was the opposite.Under the slit nozzle,the greater filtration velocity,the higher dust mass concentration,and the greater the pulse pressure required.When the filtration velocity was 0.8m/min,the pulse pressure 0.3MPa could meet the requirements of dust removal;When the filtration velocity was 1m/min,the pulse pressure was at last 0.4 MPa.After the test,the amount of dust remaining on the side far from the air bag was smaller than the side near the air bag,which was consistent with the simulation test results.