RU2581881C1 - Filter - Google Patents

Abstract

FIELD: machine building.

SUBSTANCE: filter contains a casing with ducts to supply the initial liquid, and to remove cleaned product, filter elements installed in the casing, the filer elements contains a perforated framework. Number of the filter elements is at least seven, they are made of cylindrical shape, and are uniformly distributed over the entire circle of the filer at distance at least 10 mm from each other, and from filter casing walls. The perforated framework of each filter element is coated with thin metal fibres based on the combined porous-mesh material with meshes size 0.2 mcm. The filter elements are installed between the support plate with fasteners for the filter elements, and guide and holding plate with holes for the filter elements. The filter is installed on the supports.

EFFECT: increased capacity of the filter and quality of cleaning of TEG work solution.

5 cl, 2 dwg

Description

The invention relates to a filtering technique, namely, cartridge filters designed for cleaning liquids in various industries, in particular for cleaning a working solution of absorbent triethylene glycol (TEG) from its degradation products and solids in the gas industry.

A known filter for cleaning liquids (AS USSR No. 1542579, publ. 02.15.1990), containing a housing with nozzles for supplying and outputting filtered and washing liquid, the filter element is made in the form of a spiral made of wire wound on a perforated glass.

Also known is a filter (AS USSR No. 1556713, publ. 04/15/1990), containing a cylindrical body with an inlet pipe, end caps, one of which has an outlet pipe installed inside the sleeve body and a filter element including a perforated frame with filter mesh.

Known adopted for the prototype filter for cleaning liquids (AS USSR No. 1560267, publ. 04/30/1990), containing a housing with nozzles for supplying the source fluid, drainage of the filtrate and the removal of pollution, placed in the housing with the formation of an annular gap hollow screen filter element with a base.

Common disadvantages of the known filters are: low productivity, insufficient efficiency when cleaning such solutions as, for example, a working solution of triethylene glycol (TEG) from its degradation products and mechanical impurities, low adsorption properties of the used filter materials for the required quality of TEG cleaning.

The problem to which the invention is directed, is to improve the operational properties of the filter by eliminating the above disadvantages.

The technical result achieved by using the proposed technical solution is to increase the filter performance and improve the quality of cleaning the TEG working solution, which increases reliability and ensures trouble-free operation of the TEG regeneration system.

The technical result is achieved by the fact that in the filter containing the housing with nozzles for supplying the source fluid and the discharge of the purified product, the filter element located in the housing, including a perforated frame, according to the invention, the number of filter elements is at least 7 pieces made of cylindrical shape and radially uniformly placed around the entire circumference of the filter at a distance of not less than 10 mm from each other and from the walls of the filter housing. The perforated frame of each filter element is coated with a thin metal fiber based on a combined porous-mesh material with a mesh size of 0.2 μm. The filter element is installed between the support sheet and the guide and holding sheet. The support sheet is made with fastenings for the filter elements, and the guide sheet is made with holes for the filter elements. The filter is mounted on the support legs.

Between the distinguishing features and the achieved technical result, there is the following causal relationship.

Using for filtering several filter elements of cylindrical shape uniformly spaced around the entire circumference of the filter at a distance of at least 10 mm from each other and from the walls of the filter housing, coated with a thin metal fiber based on a combined porous-mesh material with a mesh size of 0.2 μm, allows to increase the filter performance and the quality of cleaning the working solution.

Using at least 7 filter elements allows you to achieve the optimal degree of purification of triethylene glycol and the optimal hydraulic resistance of the filter elements;

- the filter element using a combined porous-mesh material with a mesh size of less than 0.2 μm will lead to rapid contamination of the filter element with degradation products, and more than 0.2 μm will lead to an insufficient degree of purification of triethylene glycol from degradation products;

- radial uniform arrangement of the filter elements around the entire circumference of the filter at a distance of at least 10 mm from each other and from the walls of the filter housing allows you to evenly, in full, use the entire filtering area.

It was experimentally found that when the filter elements are arranged, for example, along the axis of symmetry, only half of the area of the filter elements is used in the filtering process, to which contaminated triethylene glycol enters, and the other half of the area of the filter elements is not used in full.

The cylindrical shape of the filter elements allows you to get a uniform coating of degradation products on the outer part of the filter elements, and also allows you to increase the interservice period of cleaning from the products of destruction of the filter elements.

The essence of the proposed technical solution is illustrated by drawings, where:

in FIG. 1 shows a General view of the filter,

in FIG. 2 - arrangement of filter elements.

The filter contains: housing 1 (Fig. 1) with nozzles 2, 3 with flange connections for supplying the initial working solution and removal of the purified product, respectively, filter elements 4 (Fig. 1, 2) in the amount of seven pieces of cylindrical shape and arranged radially uniformly along the entire circumference of the filter. Each filter element 4 includes a perforated frame covered with a thin metal fiber based on a combined porous-mesh material made according to the operating characteristics of the filtered medium (TEG) and the required dimensions of the filter element 4. The cell size of the combined porous-mesh material is 0.2 μm.

The installation of metal fiber on the perforated frame of the filter element 4 is carried out using diffusion welding and laser technology, which allows to obtain a permeable material with a given filtering accuracy.

The filter elements 4 are evenly installed in the backing sheet 5 with fasteners, ensuring their quick replacement. The distance on the support sheet 5 between the filter elements 4 and the walls of the housing 1 is 10 mm

The guide and holding sheet 6 is made with holes for the filter elements 4. The sheet 7 presses the filter elements 4. The fitting 8 serves to bleed air after filter repair and before putting it into operation. The pipe 9 with a flange is used to drain the working solution. The filter also contains a lid 10, a chamber 11 with a contaminated solution, a chamber 12 for purified liquid and is mounted on a support stand 13.

The filter works as follows.

The TEG working solution enters the filter through the nozzle 2 into the chamber 11 of the contaminated liquid, from where, passing through the outer side surface of the filter elements 4, it is cleaned of degradation products of TEG and mechanical impurities that settle on the pores of the material used. The purified liquid enters the central part of the filter elements 4, then into the chamber 12 of the purified liquid, and then through the pipe 3 with a flange connection, the purified absorbent enters the TEG regeneration system.

The proposed filter was used in the West Tarkosalinsky gas field. During the operation of the filter, a comparative analysis of laboratory tests was performed before and after filter replacement. Studies have shown an increased quality of filtration of the working TEG solution and, as a result, a significant decrease in mechanical impurities and its degradation products in the TEG regeneration system. During the operation of the filter as a part of the technological scheme of TEG regeneration due to the homogeneity of the filter material, its productivity increased, as a result of which it is possible to withdraw a parallel working filter to the reserve.

Claims (5)

1. A filter comprising a housing with nozzles for supplying a source liquid and discharging a purified product, a filter element located in the housing, including a perforated frame, characterized in that the number of filter elements is at least seven pieces made of a cylindrical shape and evenly spaced around the entire circumference filter at a distance of at least 10 mm from each other and from the walls of the filter housing, while the perforated frame of each filter element is covered with a thin metal fiber based on a combined porous mesh this material with a mesh size of 0.2 μm. 2. The filter according to claim 1, characterized in that the filter elements are installed between the support sheet and the guide and holding sheet. 3. The filter according to claim 2, characterized in that the support sheet is made with fastenings for filter elements. 4. The filter according to claim 2, characterized in that the guide and holding sheet is made with holes for the filter elements. 5. The filter according to claim 1, characterized in that it is mounted on the support-racks.

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