RU196974U1 - DEVICE FOR TWO-STAGE CLEANING OF HIGH PRESSURE NATURAL GAS PARTICLES - Google Patents

Abstract

The utility model relates to gas supply, in particular to devices for two-stage purification of natural gas from large and small solid particles. The technical task of this solution is to prevent the deposition of solid particles in the lower part of the gap between the cylindrical filtering elements of preliminary and fine cleaning and preservation of the initial throughput of the device. A device for two-stage cleaning of solid particles of high-pressure natural gas contains a vertically mounted cylindrical body with inlet and outlet nozzles in its lower part and a flange in the upper part of the body on which the cover is hermetically fixed. Inside the housing there is a cup connected to the outlet pipe, and cylindrical filter elements - a pre-filter element from a metal mesh and a fine filter element located along the inner surface of the pre-filter element with the formation of a gap between them. The filter elements are hermetically connected in the lower part to the glass, and in the upper part with an additional cover connected to the glass. The fine filter element is made of synthetic mesh laid in layers and sealed. The first layers in the direction of the gas flow are made with a mesh size exceeding the mesh size of the preliminary filter element. The number of these layers is selected from the condition that their total thickness exceeds the mesh size of the pre-filter element. The subsequent layers of the fine filter element have a mesh size smaller than the cell size of the preliminary filter element. The mesh size of these layers decreases gradually and the last layer has a minimum mesh size. 3 s.p. f-ly, 2 ill.

Description

The utility model relates to gas supply, in particular, to devices for two-stage purification of natural gas from large and small solid particles, and can be used for preliminary and fine purification of natural gas in gas reduction points and gas distribution stations operated in the room.

A device is known for two-stage purification of high-pressure natural gas, containing two vertically mounted cylindrical bodies, each of which has an inlet and an outlet pipe in their lower part and flanges in the upper part of the body. A cover is sealed and detachably connected to the flange of each of the housings. The glass inside each of the housings is hermetically connected to the outlet pipe. Inside one of the housings is a filtering cylindrical element (CFE) of pre-cleaning from a metal mesh, and inside the second case there is a filtering cylindrical element of thin cleaning from a nonwoven fabric based on fibrous materials, each of which is detachably and hermetically connected to the glass using a gasket. In the upper part, on each of the CFEs, an additional cover is fixed with a gasket (Industrial gas equipment: reference book. - 6th ed., Revised and additional - Saratov: Gazovik, 2013, p. 511).

A disadvantage of the known device is the large mass of two separate filter housings operating under high pressure, having large thicknesses of shells, bottoms and flanges.

The closest in technical essence is a device for two-stage cleaning of solid particles of natural gas of high pressure (patent RU No. 174446, publ. 10/13/2017), which contains one vertically mounted cylindrical body with inlet and outlet nozzles in its lower part and a flange in the upper body parts. A cover is sealed to the flange. Inside the housing there is a cup connected to the outlet pipe and a filtering cylindrical pre-filter element from a metal mesh, as well as an additional cylindrical filter element located along the inner surface of the filter element from a metal mesh with the formation of a gap between them and made of non-woven fibrous material. The filter elements are hermetically connected in the lower part with a glass, and in the upper part - with an additional cover.

This device has significantly smaller dimensions and weight. However, the disadvantage of this device is that during the purification of natural gas, solid particles are deposited in the lower part of the gap between the CPE of preliminary and fine cleaning. The wicker metal mesh pre-filter element has 0.08 mm cells and traps solid particles larger than 0.07-0.08 mm. The fine filter element is made of a cloth based on synthetic fiber - a non-woven fibrous material with cells whose size is less than 0.08 mm. As a result, solid particles leaving the CPE of preliminary purification with a size of 0.08 and less colliding with the surface of the fine filter element partially settle on the surface of the nonwoven fibrous material, and partially fall into the lower part of the gap between the CPE of preliminary and fine cleaning. Gradually accumulating here, solid particles form a continuous layer and clog the cells of the lower part of the CPE of preliminary and fine cleaning, which leads to a decrease in their throughput.

The technical task of this solution is to prevent the deposition of solid particles in the lower part of the gap between the cylindrical filtering elements of preliminary and fine cleaning and preservation of the initial throughput of the device.

The problem is achieved in that the device for two-stage cleaning of solid particles of natural gas of high pressure contains a vertically mounted cylindrical body with inlet and outlet nozzles in its lower part and a flange in the upper part of the housing on which the cover is hermetically fixed. Inside the housing there is a cup connected to the outlet pipe, and cylindrical filter elements - a pre-filter element from a metal mesh and a fine filter element located along the inner surface of the pre-filter element with the formation of a gap between them, made of synthetic material laid in layers and compacted. The filter elements are hermetically connected in the lower part to the glass, and in the upper part with an additional cover connected to the glass. New is that the layers of the fine filter element from a synthetic mesh, the first in the direction of gas flow, are made with a mesh size exceeding the mesh size of the preliminary filter element. The number of these layers is selected from the condition that their total thickness exceeds the mesh size of the pre-filter element. Subsequent layers of the fine filter element have a mesh size smaller than the cell size of the preliminary filter element. The mesh size of these layers decreases gradually and the last layer has a minimum mesh size.

The utility model is illustrated by drawings, where in FIG. 1 shows a General view in section of the proposed device, in FIG. 2 - fragment A of a General view.

A device for two-stage cleaning of solid particles of high-pressure natural gas contains (Fig. 1) a vertically mounted cylindrical housing 1, to which the inlet pipe 2 and the outlet pipe 6 are located hermetically and integrally, located in the lower part of the housing 1. In the upper part, the housing 1 has a flange 3, on which a cover 4 is sealed by means of a gasket and bolts 4. A cup 5 is located inside the housing 1, hermetically connected to the outlet pipe 6. Inside the housing 1 along its lateral surface Credited filtering cylindrical prefilter elements 7 and 8. The filter of fine purification prefilter element 7 is made of metal mesh. The fine filter element 8 is located along the inner surface of the filter element 7 with the formation of a gap between them 12. In the lower part, the filter elements 7 and 8 are hermetically and detachably connected by means of a sealing gasket to the annular plate of the cup 5, and in the upper part is hermetically sealed, also, with the help of the sealing gasket, an additional cover 9 is fixed. In this case, the cover 9 and the glass 5 are connected by means of a metal stud (not shown in Fig. 1) with threads at the ends. A hairpin is located in the center of the cleaning device and is connected by a threaded connection at one end with a cover 9 and at the other with a glass 5. The pre-filter element 7 from a woven metal mesh has cells 10 (Fig. 2) of size b _p and retains solid particles of size bigger size b _n mesh cells 7 pre-treatment. The fine filter element 8 is made on the basis of a fabric of synthetic nets laid in layers, arranged one after another and sealed. Hollow filter cylindrical elements 7 and 8 form an internal volume 14 in the center of the purification device for collecting purified gas. The fine filter element 8 has at least two layers, the first in the direction of gas flow, which are made with a mesh size of 11 that exceeds the mesh size of the preliminary filter element b _t1 > b _p . The number of these first layers is selected from the condition that the thickness of the formed packet S _{t. 1 of} these layers exceeds the mesh size of the pre-filter element 7 S _{t. 1} > b _p . The subsequent layers 13 of the fine filter element have a mesh size smaller than the mesh size of the preliminary filter element. The size of these subsequent layers may decrease gradually and the last layer has a minimum cell size comparable to the minimum size of solid particles in natural gas.

The device operates as follows.

Natural gas, untreated from large and small solid particles, is supplied through an inlet pipe 2 to a vertically mounted housing 1. The gas passes through the side surface of a cylindrical pre-filter element 7 from a woven metal mesh with a mesh size b _p . Large solid particles larger than b _p located in the gas settle on the outer surface of the filtering cylindrical element and the gas is cleaned of these particles. And the particles 15 (Fig. 2) of size equal to b _p , partially settle, and partially pass through the pre-filter screen. Thus, the preliminary purification of natural gas from large solid particles occurs. Further, the gas passes through the lateral surface of the fine filter cylindrical filter element 8, in which the first layers 11 in the direction of the gas flow have cells with a size b _t1 > b _p Solid particles 15 of a size equal to or smaller than b _p coming from the pre-filter element freely pass through these layers and settle in their thickness, because cells of subsequent layers are smaller. Since the thickness S _{t. 1 of the} first layers exceeds the size of the cells of the preliminary filter, the diameter of these solid particles will be less than the thickness of these layers and they will settle in their thickness without protruding beyond the boundaries of the first layer of the fine filter. As a result, solid particles will not fall into the lower part of the gap 12 and thus will not accumulate in the gap 12, forming a continuous layer in the lower part of the gap between the pre-filter and fine filter CPE, clogging the cells of the lower part of the pre-filter and fine filter. As a result, the throughput through their lower part will not stop. For each subsequent layer 13, the cell sizes are reduced, and the last layer has a minimum cell size. The size of the last layer is comparable to the minimum size of solid particles in natural gas. Due to this, the fine filter element purifies the gas from fine solid particles with a degree of filtration (delay) of at least 99.5%, having dimensions exceeding 0.005 mm. Finely purified natural gas enters the internal volume 14 of the hollow filter cylindrical element 7 and through the glass 5 through the outlet pipe 6 of the housing 1 enters the gas equipment. The cover 9, hermetically connected to the upper ends of the filtering cylindrical elements 7 and 8, prevents the entry of untreated gas into the interior of the filtering cylindrical elements 7 and 8, where the purified natural gas is collected. If the outer surface of the filter element 7 becomes clogged with large solid particles to the calculated level, the gas supply is blocked on the cleaning device, it is purged with inert gas, the covers 4 and 9 are removed, the filter element 7 is removed and large particles are cleaned with brushes and a washing solution . The fine filter element 8 is clogged throughout the thickness of the filter material. Fine particulate matter or dust cannot be removed from tightly laid fibrous layers. When the filter element 8 is clogged with small solid particles to the calculated level, it is replaced with a new one.

Thus, the two-stage cleaning device prevents the deposition of solid particles in the lower part of the gap between the cylindrical filtering elements of preliminary and fine cleaning and, as a result, does not stop the throughput through their lower part.

To confirm the prevention of the deposition of solid particles in the lower part of the gap 12 between the CPE of preliminary 7 and fine 8 cleaning and preserving the throughput through their lower part, a gas two-stage filter with an inner diameter of D = 160 mm, equipped with a preliminary cleaning stage from a metal mesh with cell size b _p = 0.08 mm The fine filter is made of a cloth consisting of 7 layers of synthetic nets with a minimum cell size of the last layer of 0.01 mm in the direction of gas flow. For testing, high pressure air with sand particles contained in it 0.1–0.02 mm in size was used as a working medium.

There are two options for fine filter.

First option. The filter cloth of element 8 is made of 7 synthetic nets laid in layers, then sealed. The first three layers 11 were selected in the direction of gas flow, the total thickness of which is S _t.1 = 1.00 mm (S _t.1 > b _p ). These three layers have cells with a size of b _t1 = 1.00 mm, (i.e. b _t1 > b _p. > 0.08 mm). Solids with a maximum size of 0.08 mm coming from the pre-filter element freely pass through these first layers and settle into them.

The second option. The filter cloth of element 8 is made of 7 synthetic nets laid in layers, then sealed. The first two layers 11 were selected in the direction of the gas flow, the total thickness of which is S _t.1 = 0.06 mm (S _t.1 <b _p ). These two layers in the direction of gas flow 11 have cells with a size of b _t1 = 0.06 (b _t1 <b _p <0.08 mm). Solid particles with a maximum size of 0.08 mm, coming from the pre-filter element do not pass through the first two layers and settle in the gap 12 between the filter elements, creating a layer that prevents the passage of gas through the lower part of the filter elements.

The test results showed the following.

For the first option, the presence of only individual solid particles was noted in the lower part of the gap 12 between the CPE of preliminary and fine cleaning, without the formation of a continuous layer, clogging the cells of the lower part of the CPE of preliminary and fine cleaning.

For the second option, the formation of a continuous layer with a height of 23.0 mm was detected, which clogs the cells of the lower part of the CPE of preliminary and fine cleaning, preventing the gas from passing through the lower part of the filter elements of preliminary and fine cleaning and reducing the throughput of the device as a whole.

Thus, the proposed device prevents the accumulation of solid particles in the lower part of the gap between the CPE of preliminary and fine cleaning when using the proposed filter element of fine cleaning, which preserves the original throughput of the natural gas purification device.

Claims (3)

1. A device for two-stage cleaning of solid particles of natural gas of high pressure, containing a vertically mounted cylindrical body with inlet and outlet nozzles in its lower part and a flange in the upper part of the housing, on which the cap is hermetically fixed, inside the housing there is a glass connected to the outlet nozzle , and cylindrical filtering elements - a prefilter filter element of a metal mesh and a fine filter element located along the inner surface prefilter filter element with a gap between them, made of synthetic material laid in layers and sealed, while the filter elements are hermetically connected in the lower part to the glass and in the upper part with an additional cover connected to the glass, characterized in that the filter layers fine filter elements, the first in the direction of gas flow are made with a mesh size exceeding the mesh size of the preliminary filter element, and the number of these layers is selected from the condition that their total thickness exceeds the mesh size of the pre-filter element, while the subsequent layers of the fine filter element have a mesh size smaller than the mesh size of the pre-filter element. 2. A device for two-stage cleaning of solid particles of high-pressure natural gas according to claim 1, characterized in that the cell size of the layers following the first layers of the fine filter element decreases gradually and the last layer has a minimum cell size. 3. A device for two-stage cleaning of solid particles of high-pressure natural gas according to claim 1, characterized in that the fine filter is made of synthetic mesh laid in layers.

Images