A comprehensive evaluation method for the performance of laminated filter

Abstract

The invention discloses a comprehensive evaluation method for performance of a laminated filter, and belongs to the technical field of agricultural drip irrigation. The method comprises the steps of:determining the plugging uniformity of the laminated filter; fitting plugging uniformity [Eta]u, periodic sediment reduction M, and sediment median diameter d50 of different laminated filters by a linear function on the basis of lamination structure parameters of different laminated filters, wherein, the lamination structure parameters comprise the correlation between the lamination thickness d, the number n, the runner length l, the runner number fn, the runner trench bottom corner [Theta] in outer cross section, and the runner trench height h in outer cross section; and establishing a regression equation and a comprehensive evaluation mathematical model using a multivariate linear regression analysis method. The smaller the comprehensive evaluate value of the performance of the laminatedfilter, the better the performance of the laminated filter. The method of the invention can quickly and comprehensively evaluate the performance of the laminated filter through the structure size parameters of the lamination. Therefore, it has certain application value for guiding the selection of suitable laminated filter products.

Description

technical field [0001] The invention belongs to the technical field of agricultural drip irrigation, and in particular relates to a method for comprehensively evaluating the performance of a laminated filter. Background technique [0002] The blockage of the emitter is the biggest obstacle to the development of drip irrigation technology. As the last barrier to purify the water source in the drip irrigation system, the filter is the core equipment to ensure the normal operation of the entire system. Its working performance will directly affect the performance of the entire drip irrigation system. . [0003] The laminated filter is an advanced technology in the field of impurity treatment, but due to its complex flow channel structure, it is often accompanied by a surge in head loss during operation. Selecting a suitable laminated filter product is the most effective way to improve filtration performance. The structure of the laminate is the main parameter affecting the filt...

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Problems solved by technology

[0005] At present, most studies have conducted performance tests on laminated filters to evaluate their filtration performance from the operating cycle, sediment removal rate, and head loss of the laminated filter. These evaluation methods are based on a single Starting from the index, the growth rate and operation period of the head loss are one of the important indicators to characterize the performance of the laminated filter. However, according to the dynamic change law of the head loss of different filters with the operation of the system, it can be seen that different The operating stages show different characteristics of changes. The performance of the laminated filter is evaluated only by the size of the head loss and the operating cycle. The standard is relatively broad and cannot comprehensively reflect its filtration performance.

The structure of the laminate is the main factor affecting the performance of the laminate filter. At present, the research on the influence of the laminate structure on the performance of the laminate filter is still limited to the field of CFD simulation. There is no method based on the structural size of the laminate. Size is used to evaluate the performance of laminated filters

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