SU1754156A1 - Filter for purification of liquids - Google Patents

Abstract

The invention relates to sectioned continuous filtering devices for the purification of pressurized liquids with automatic counterflow washing of the filtering partition and can be used in chemical, petrochemical, food and other industries. The goal is to increase the filter performance by efficiently regenerating the filter elements. A filter for cleaning liquids with an automatic countercurrent rinsing of filter elements includes a housing with filter elements with a filter cartridge located inside it around the circumference, a rotary nozzle with a drive, and a control system. The filter has hermetic chambers, each of which is mounted on top of the filter element and communicates with a source of compressed gas, with a gap between its movable bottom and the end of the channel for the exit of purified liquid from the filter element, and a tube with a check valve is fixed in the bottom. 1 zp ff-ly, 4 ill. 3 cl c

Description

The invention relates to sectional continuous filtration devices for cleaning pressurized liquids with automatic countercurrent washing of the filtering partition and can be used in the chemical, petrochemical, food and pharmaceutical industries, in mechanical engineering and transport devices for cleaning process, lubricating and cooling liquids.

The goal is to improve the performance of the filter due to the effective regeneration of filter elements.

FIG. 1 shows the filter, general view, section; in fig. 2 — node I in FIG. 1 (the solid line shows the position of the membrane and

the disk when the filter is running, and the dotted one when the filter is regenerated); in fig. 3 shows section A-A in FIG. 2; in fig. 4 - node II of FIG. 1. The filter includes filter elements 1 located inside the housing 2 and mounted around the circumference on the partition wall 3, which divides the internal cavity of the housing into two chambers — the upper and the lower; inlet 4, outlet 5, swivel 6 nozzles. Each filter element 1 has a cylindrical housing 7 with a filter cartridge 8 located inside it, consisting of a filter partition 9, made in the form of a tubular channel, closed by a plug 10 at the bottom. The housing 7 ends at the bottom with a nozzle 11 extending into the lower chamber of housing 2. Filtering partition

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The casing 9 and the casing are overlapped from above with a flange 12 (Fig. 2) with a central channel 13 for the purified liquid to exit the filter element into the upper cavity of the housing 2. On the flange 12, the posts 14 (Fig. 2, 3) are sealed (Fig. 2) the chamber 15, consisting of the cover 16 and the bottom 17. The size of the gap between the bottom 17 and the extreme section of the channel 13 during the operation of the filter is determined by the height of the struts 14. The bottom 17 is made in the form of an elastic membrane 18c fixed on it by the disk 19c by the tube 20, the bottom the end of which is placed in the lower part of the filter cartridge 8 in the immediate vicinity it is provided with a check valve 21, which is made, for example, in the form of a disk, which is pressed against the edge of the tube 20 by the tension of the spring. The conduit 22 is intended to be supplied to the chamber 15 during the regeneration of the filter head of compressed gas.

The filter works as follows.

The liquid to be cleaned of mechanical impurities is supplied under pressure through the inlet 4 to the lower chamber of the housing 2 and then through the nozzle 11 to the filter element 1. Passing through the filter partition 9, the cleaned liquid leaves the filter cartridge 8 through the gap between the bottom 17 of the chamber 15 and the edge - by the cross section of the channel 13 for the exit of the purified liquid into the upper chamber of the housing 2, from where it is discharged through the nozzle 5. During the filter operation, when the gas pressure in the chamber 15 is absent, the bottom 17 is raised above the canal opening la 13 as shown in Fig 2 by a solid line.

Particles of the dispersed phase of the liquid being purified by the filter septum 9 form a layer of sediment on its surface and penetrate inside the pores, blocking them or adsorbing on their inner surface, thereby increasing the hydraulic resistance of the filter partition 9 When the specified pressure difference between the inlet 4 and the outlet 5 nozzles triggers a device for measuring it, sending a signal to the control system unit, issuing a command to operate the actuator to install the rotary nozzle 6 under the first filter element 1 and the supply of compressed gas through conduit 22 to chamber 15 (filter control system and drive are not shown).

With the message of the rotary nozzle 6 with the nozzle 11 of the filter element 1 and the subsequent supply of compressed gas into the chamber 15, the filter element 1 is switched off

from operation, and begins the regeneration mode of the filter septum 9.

The crude liquid from the area between the filter septum 9 and the casing 7 flows through the rotary nozzle 6 into a collection container (not shown), in which the pressure is atmospheric. Under the action of compressed gas due to deformation of the membrane 18, the bottom 17 is displaced downwards and the disk 19 closes the channel 13 to exit the purified liquid from the filter element of the filter cartridge 8, and the compressed gas, the output from the tube 20, begins to flow into the filter cartridge 8, bubbling through the layer of purified liquid filling the filter cartridge 8. The gas-liquid emulsion that forms at the same time is forced through the filter septum 9, washing it with a two-phase gas-liquid flow. Depending on the size of the gas bubbles, the degree of gas saturation and the amount of liquid remaining in the cartridge 8, various modes of gas-liquid flow through the filter partition 9 are possible.

The particles of the dispersed phase that are removed from the pores of the filter septum 9 and its outer surface are washed away with liquid filtered through the filter septum into a collection container.

After filling the filter cartridge 8 with the purified liquid and supplying the compressed gas to the chamber 15, such a cycle of regeneration of the filter screen by a two-phase gas-liquid flow can be repeated.

After delaying the time required for regeneration of the filter septum 9 in one or several washing cycles, the control system is instructed to cut off the supply of compressed gas to the chamber 15 of the regenerated filter element 1 and to rotate the secondary nozzle 6 in order to install it under the next filter element 1.

The removal of the rotary nozzle 6 from the filter element 1 with the cleaned filter partition 9 and the termination of the supply of compressed gas into the chamber 15 opens the tolerance of the lower cavity of the liquid to be cleaned and the output of the purified liquid from it into the upper cavity.

During the operation of the filter, it is possible for the purified liquid to flow into the inside of the tube 20 and further into the chamber 15 into the pipe 22. To prevent such liquid flowing, the tube 20 is provided with a check valve 21.

Claims (2)

Claim 1. A filter for cleaning liquids, comprising a housing with filter elements with a filter cartridge located inside its circumference, a rotary nozzle with a drive and a control system, characterized in that, in order to increase filter performance due to efficient regeneration of filter cartridges, the filter is equipped with - with a source of compressed gas sealed chambers, the bottom of which is installed with a gap to the end of the output channel of the filter element, while the bottom of the sealed chamber is made with the possibility of vertical movement of the gap and has a tube, the lower end of which is placed at the bottom of the filter cartridge. 2. The filter according to claim 1, characterized in that the lower end of the tube has a check valve. P ui f f Iff  if 1 G- -t-tg77 y | ; -2 UUUUUUUTST UCH 6 I AE / Z 2 7 /////// 7 I fZ 20 / J Phie. 2 A-A f4 15 22 F I fi 4