多射流喷吹下扁式方框滤筒清灰性能优化

Optimization of cleaning performance of flat filter under multi pluse-jet

为了解决扁式方框滤筒上部清灰不均匀的问题,针对长、宽、高分别为470、64、1000 mm的扁式方框滤筒,利用压力传感器测量两列距离滤筒顶部100、500、900 nun的6个测点的侧壁压力峰值,其中测点4、5、6正对喷吹孔,1、2、3为非正对喷吹孔测点。研究不同喷吹压力(0.3、0.4 MPa),不同喷吹距离(10、20、40、60、80、100 mm)下,2种喷吹孔对侧壁压力峰值的影响。结果表明:喷吹压力为0.3、0.4 MPa时,圆形喷吹孔下的最佳喷吹距离均为20 nnn,但此时扁式方框滤筒上压力分布极不均匀,上部测点1、4侧壁压力差值超过1000 Pa,且这种不均匀程度随喷吹压力的增加而增加。而相同条件下,条缝式喷吹孔在喷吹距离适用范围为20-40 mm,上部测点1、4测点压力相差在400 Pa以内,有效地改善了扁滤筒上部清灰不均匀的问题。

In order to solve the problem of uneven cleaning on the upper part of the flat cartridge filter,this paper used a pressure sensor to measure the peak pressure of six poins that the distances from the top of this filter is 100、500、900 mm,aiming at the filter with length of 470 mm,width of 64 mm and height of 1000 mm.Among them,the measuring points 4,5,and 6 were opposite the nozzles,and 1,2,and 3 were non-opposite the nozzles.The effects of two kinds of nozzles on the pressure peaks under different pulse pressures(0.3,0.4 MPa)and jet distances(10,20,40,60,80,100 mm)were studied.The results show that when the pulse pressure is 0.3,0.4 MPa,the optimum jet distance under the circular nozzle is 20 mm,but the pressure distribution on the flat filter is extremely uneven,the peak pressure between the upper measuring points Px and P4 exceeds 1000 Pa,and this degree of unevenness increases as the pulse pressure increases.Under the same conditions,the optimal jet distance of the slot-type nozzle is 20-40 mm,and the peak pressure between the upper measuring points Px and P4 is within 400 Pa,which effectively improves the problem of uneven cleaning of the upper part of the flat filter cylinder.