X-spiral-flow wound membrane diversion screen

Abstract

The invention discloses an X-spiral-flow wound membrane diversion screen, which consists of a plurality of layers of flow passages which are overlapped together. Each layer of flow passages consists of longitudinal ribs. The layers of flow passages are in parallel with each other. Adjacent layers of flow passages are staggered in an X shape, i.e. the longitudinal ribs of the adjacent layers are connected in an X staggered and overlapped way to facilitate conversion from laminar flow to turbulent flow and eliminate influence caused by concentration polarization. Since the X-spiral-flow wound membrane diversion screen consists of a plurality of layers of flow passages consisting of longitudinal ribs, transverse ribs are not used and the scheme is different from the existing schemes, not only can the area of contact with a membrane surface be reduced and the effective available area of a separation membrane be increased, but also a dead corner is not produced, the disturbance of the laminar flow can be facilitated to convert the laminar flow to the turbulent flow under the secondary flow facilitating effect of an X spiral flow, the driving force and the mass transfer effect of solute diffusion are enhanced and the mass transfer capacity of primary liquid is greatly improved. The efficiency of membrane separation is improved, the volumetric percolate flux of the separation membrane is improved, the deposition of pollutants is avoided and the defects of the existing technical scheme are avoided.

Description

Technical field [0001] The present invention relates to the technical field of membrane separation, in particular to a method used in high-purity separation (for example, in the food, medical and pharmaceutical industries), environmentally friendly sewage treatment or seawater desalination industry, using engineered osmosis (for example: reverse osmosis, Forward osmosis) Diversion screens of forward osmosis, reverse osmosis membranes, nanofiltration membranes, ultrafiltration membranes, microfiltration membranes, electrodialysis membranes, permeable gasification membranes, membrane bioreactors, etc. for separation and extraction operations. Background technique [0002] At present, the structure of various spiral-wound membranes is roughly the same. They all consist of a membrane bag with a built-in porous diversion net and a diversion screen that plays the role of interval diversion. They are wound in a hollow porous tube-the center product collection The tube is then sealed and...

AI Technical Summary

Problems solved by technology

[0016] In order to overcome the deficiency that the existing diversion screen cannot effectively generate turbulent flow, improve the solute diffusion coefficient, and eliminate the concentration polarization in practical applications, the present invention provides an X-swirl roll-type membrane diversion screen and Application, the present invention guides the conversion between two different flow states of laminar flow and turbulent flow through the structure design of multi-layer flow channel X interlaced diversion net, and promotes the transformation of laminar flow into turbulent flow due to cross-flow disturbance

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