RU2108142C1 - Diaphragm rolled element - Google Patents

Abstract

FIELD: desalination and demineralization of natural and waste waters by reverse osmosis. SUBSTANCE: diaphragm rolled element is made up of sheets of folded in two diaphragm, drain placed between them, and turbulence agent-separating element helically wound on a drain-tube and laid directly on the drain; turbulence agent-separating element is made in the form of watertight parallel plates combined in a block, the plates of the previous and subsequent layers of turbulence agent - separating element are opposite-directed. EFFECT: enhanced efficiency. 2 dwg

Description

 The invention relates to the field of desalination and desalination of natural and wastewater by reverse osmosis, in particular to the field of separation of liquids using spiral membrane roll elements.

 Known membrane roll element installed in the housing and consisting of a coaxially placed perforated outlet tube, a membrane spirally wound on the tube, a turbulizer-separator made in the form of a network of polymer fibers placed in the space between the layers of membranes and in contact with them, and drainage (US patent N 3417870 class. 210-32, publ. 1968).

 A disadvantage of the known device is the low reliability due to the formation of stagnant zones at the junction of the fiber connecting the turbulator-separator mesh with the membrane, and the need to prevent crystalline deposits from forming on the membrane, the latter will lead to overgrowth of the element with sparingly soluble salts, and a decrease in the life of the membrane element.

 Known membrane roll element located in the housing, and consisting of a coaxially mounted perforated outlet pipe, sequentially located turbulator-separator, membrane and drainage; the separator turbulator is made in the form of a mesh of polymer material bonded at the points of contact with the membrane; in this case, all the elements are spirally wound on the outlet tube (a.p. N 1560279 class B 01 D 61/08 of 01/13/87., publ. 30.04.90).

A disadvantage of the known device is the difficulty in manufacturing the element, due to the need for applying adhesive joints of the separator-turbulator in places of its contact with the selective layer of the membrane, the destruction of which is inevitable;
Known membrane roll element, consisting of a Central tube attached to it and spirally wrapped around it drainage material, between the layers of which are folded in two membranes, inside which are placed the grid layers of a turbulator-separator; at the same time, adhesive seams forming a U-shaped channel are located at an angle to their axis on the surface of the separator turbulator, and at the place of the adhesive seams exit around the element there is a separating cuff (a.s. N 1619495 class B 01 D 63/12 from 05.12 .88).

 A disadvantage of the known device is the low life of the membrane element, due to the formation of stagnant zones at the junction of the fiber joint of the turbulator-separator mesh with the membrane, leading to overgrowth of the element with sparingly soluble salts; the complexity of manufacturing, due to the need to apply an adhesive joint forming a U-shaped channel, and low reliability due to degradation of the adhesive in the system operating under pressure.

 Known membrane roll element, the closest in purpose and technical essence to the claimed one, consisting of sheets of a double-folded membrane, placed between them drainage, and layers of turbulators-separators, laid over each of the sheets of the membrane, spirally wound on a perforated drain pipe. Before winding the layers of the element on its three free sides, an adhesive is applied, which is used as an adhesive with a high and low degree of fluidity. (Japanese application N 2-21290 class. B 01 D 63/10 from 10.19.82., publ. 14.05.90.

 A disadvantage of the known device is the low life of the membrane element, due to the formation of stagnant zones at the points of contact of the fiber joint of the turbulator-separator mesh with the membrane, leading to overgrowth of the element with sparingly soluble salts.

 The technical result of the claimed membrane roll element is to increase the service life.

 The technical result is achieved by the fact that in a membrane roll element comprising sheets of a double-folded membrane, a separator turbulator and drain, helically wound on a perforated drain pipe, the separator turbulator is placed above the drain and made in the form of parallel waterproof polymer plates combined in a block, this plate of the previous and subsequent layers of the turbulator-separator are multidirectional.

 Figure 1 presents the membrane roll element in expanded form; figure 2 - diagram of the pressure channel with the profile of the turbulator-separator.

 The membrane roll element 1 consists of membrane bags 2 spirally wound around a perforated drain pipe 3. Each bag 2 consists of a double-folded sheet of membrane 4 and a sheet of drainage material 5 laid between them, and sheets of turbulator-separator 6 are laid between each of the sheets the membrane 4 and the drainage sheet 5 and are a block made of parallel waterproof polymer plates 7, while the plates 7 of the previous and subsequent sheets of the turbulator-separator 6 are multidirectional.

 Membrane package 2 is glued along the edges on three sides. The sheets of the turbulizer-separator 6 are made narrower than the sheets of membranes 4 and drainage 5 and laid on the surface of the drainage sheet 5 so that the adhesive joint 8 is outside the contours of the membrane package 2.

 Narrow strips of separator mesh 9 are laid over the adhesive seam 8 on the surface of the membrane sheet, forming the inlet channel 10 for the source water.

 Roll membrane element operates as follows.

 Source water with a salt concentration of up to 10,000 mg / l is supplied through the inlet channel 10. Under the influence of working pressure, a semipermeable membrane 4 (composite or cellulose acetate) “facilitates” the waterproof polymer plates 7 of the turbulator-separator 6, laid on the drainage sheet 5, forming a pressure channel with the profile of the turbulizing grid (composed by plates 7 of each of the sheets of the turbulizer-separator 6). The execution of each of the layers of the turbulator-separator in the form of parallel waterproof polymer plates 7 that are not in contact with each other, and the placement of the turbulator-separator 6 directly above the drain 5 eliminates the formation of "stagnant zones" at the contact points of the membrane 4 with the turbulator-separator 6, the formation of poorly soluble precipitation on the surface of the membrane 4 and thereby ensures the reliability of the membrane element 1 and increases its resource. Water flows along the formed pressure channel and in the form of a concentrate is discharged from the membrane element 1. Part of the pressure water stream passes through the membrane 4 and drain 5 and is discharged through a perforated drain pipe 3. The purified water has a salt concentration of up to 100 mg / l.

 The proposed membrane roll element in comparison with the known one has a higher service life on water of the same composition (Moscow water supply), the inventive membrane roll element works without changing the indicators> 3000 hours, while the known after 300 hours of operation reduces the indicators.

 The latter is determined by the design feature of the turbulator-separator, which is a block of waterproof polymer plates, each of which is separated from one another by a drainage sheet, while the plates of the previous and subsequent sheets of the turbulator-separator are multidirectional; the above structural differences practically exclude the formation of "stagnant zones" where poorly soluble salts are concentrated.

Claims (1)

 A membrane roll element comprising sheets of a double-folded membrane, a separator and a drain, spiral wound on a perforated drain pipe, characterized in that the separator is placed above the drain and made in the form of parallel waterproof polymer plates combined into a block, the plates of the previous and subsequent sheets of turbulizer-separator are multidirectional.

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