Full-scale Numerical Simulation Research On Performances Of A New Type Of Filter Cartridge

Cartridge filters are widely used in the field of fine particulate matter emission control due to its large filtration area, low pressure loss, small size, long service life and so on. Currently the studied of the pleated filters used commonly are mainly focused on the parameters of filter and injection, and other factors. However, work on the structure optimization of the pleated filter is less. In the process of dust cleaning,dust accumulated at the upper part of the conventional cartridge filter is not completely cleaned due to the low dust removing energy of the upper part. But the lower part of the conventional cartridge filter is easy to damage because of the high dust removing energy of the lower part. In this paper, a new type of filter cartridge with a pyramidal structure is studied.The filtration and cleaning models of conventional cartridge filter and the new cartridge filter with different structure parameters(the height of pyramidal structure,top radius of pyramidal structure) have been established by SolidWorks software,respectively. The performances of filtration and cleaning performance were studied on the basis of computational fluid dynamics(CFD), and experiments were carried out to verify the accuracy of the simulation. The filtration performance of the filter with different inlet velocities was studied by using the conventional filter and the new filter cartridge containing three filter cartridges. The results show that the average deviation amplitude of flow rate, for the conventional filter and the new filter cartridge, is 0.14 and 0.067, respectively, which indicates that the inner wind speed of the new filter is more uniform than that of the conventional filter. For the new cartridge filter, the pressure distribution inside the filter cartridge becomes uniform, and the pressure loss decreases gradually with the increase of the pyramidal height and pyramidal top radius.The dust cleaning performance of the conventional cartridge filter and the new type of cartridge filter were studied. The results show that the distribution of dust cleaning pressure in the inner of the new cartridge filter is more uniform. For the new type of cartridge filter, the peak pressure of the filter cartridge becomes larger with the increase of pulse width. With the increase of injecting distance, the velocity distribution of the filter cartridge becomes more uniform. In addition, the dust cleaning pressure also increases with the increase of the height of the pyramidal.The pressure peak of the new type of cartridge filter with different pyramidal height(h), the pyramidal top radius(r), pulse width(T) and injecting distance(X) werecalculated. The results show that the four factors have influence on the dust removal efficiency. The influence of the above factors on the dust removal can be summarized as follows: r>h >T>X. The standard deviation of peak pressure decreases first and then increases with the increase of the pyramidal top radius(r) and injecting distance(X).The standard deviation of the peak pressure decreases with the increase of pyramidal height(h). In the range of h< 400 mm, the standard deviation of peak pressure decreases with the increase of pulse width(T). In the range of 400 mm < h<600mm, the standard deviation of peak pressure increases with the increase of pulse width(T). The optimized prediction results of response surface methodology show that, the standard deviation of the peak pressure of the filter cartridge is the least when the injecting distance(X) is 122 mm, the pulse width is 60 ms, pyramidal height(h) is600 mm, and the pyramidal top radius(r) is 67 mm. In this case, the peak pressure of the filter cartridge is the most uniform.