RU191341U1 - ADSORPTION TRAP - Google Patents

Abstract

The invention relates to devices for adsorptively removing moisture impurities and specific chemical compounds from a gas stream and can be used in gas adsorption purification systems, chemisorption analyzers, etc. The adsorption trap includes a housing in which the inlet and outlet channels for the gas flow are made, and a tube with a sorbent located in the housing having an inlet and outlet ends, the tube being provided with a holder so that it can be sealed tightly to the housing, where the holder is made in the form of an insulating a cylinder with a cavity for accommodating a tube plugged at one end on which the hexagon is located, the other end of the insulating cylinder is provided with an external thread for fixing the holder in the trap body, etc. the counterpart of the inner surface of the casing is provided with an internal thread, the casing is made with a lodgement for hermetically accommodating the counterpart of the tube, the inlet end of which is placed on the side of the muffled end of the cylinder, and the tube in the holder is placed with a gap between the outer surface of the tube and the inner surface of the insulating cylinder for passage gas from the inlet channel of the housing to the inlet end of the tube with the sorbent and from the outlet end of the tube to the outlet channel.

Description

Technical field

The invention relates to devices for adsorptively removing moisture impurities and specific chemical compounds from a gas stream and can be used in gas adsorption purification systems, chemisorption analyzers, etc.

State of the art

Typically, a flow adsorption trap is a glass or metal tube filled with a sorbent. Sealed connection of gas lines occurs on both sides of the tube, therefore, to replace the sorbent, it is necessary to disassemble the structure in two places.

The prior art device for cleaning gases from mechanical particles, moisture and chemical compounds, which can be used in gas, metallurgical, chemical, food, medical, microbiological and other industries in order to meet the technological requirements for consumed and emitted gases for various types productions (Patent RU 2610609). The device consists of a housing 1 with an annular perforated cylinder 5 located inside it, a lower flange with a fitting 2 for supplying gas for pressure cleaning is hermetically fixed at the bottom 1, an internal cavity 3 is formed inside the housing 1 between the wall of the housing and the outer wall 4 of the annular perforated cylinder 5, installed in the housing 1 with a gap, to the outer and inner surfaces of which there is a mesh with mesh sizes smaller than the perforation size of the cylinder walls. The inner cavity of the annular perforated cylinder 5 formed by its walls is filled with adsorbed granular material, the mesh cells being smaller than the size of the granules of the adsorption material, a porous cylindrical filter 7 is installed inside the annular perforated cylinder 5 with a gap relative to its inner wall 6, and a removable top is located on the top of the housing 1 the top cover 8 with a fitting for the outlet of the purified gas, attached to the device body tightly using gaskets 9 and clamp 10, from the inside We have removable top cover 8 is made of an annular protrusion 11, which is located in such a way that it enters the upper part of the inner cavity of the annular perforated cylinder 5 attached to the upper cover 8, to the lower part of the annular perforated cylinder 5 hermetically attached flange 12 with windows, having an annular protrusion 13, which goes into the lower part of the inner cavity of the annular perforated cylinder 5, closed by a removable cover 14, mounted on the flange 13 with windows using fasteners, to the fitting removable upper to yshki 8 is sealed the upper end of the porous cylindrical filter and the lower end thereof is sealed by a plug 18, the inner cavity formed by the housing wall and a perforated annular cylinder is connected a safety valve 19 which is tuned to a certain pressure. The invention allows to increase the efficiency of gas purification, increase its service life, increase reliability, and also allows the device to be used in an arbitrary spatial position (for example, during rotation or rotation) while maintaining a high degree of purification.

However, to restore the filter’s performance, it is necessary to replace the filter elements for their regeneration, which is associated with removing the entire device from the production line into which it is integrated. Thus, the regeneration of this device during operation is quite complicated.

Utility model RU 77444 describes the design of the sorption tube and its use in gas chromatographic determination of the mass concentration of impurities in natural gas. The sorption tube is a tubular body with ball valves located at its ends and a sorbent in the inner part. The device comprises a housing with a container for accommodating the sorption tube, which is equipped with needles with internal channels that open the valves of the sorption tube, which can be used when sampling natural gas.

The disadvantage of this solution is that the gas line is sealed on both sides of the tube, equipped with spring-loaded ball valves, complicating the design, reducing its reliability, and also causing difficulties with sorbent replacement due to the need for their preliminary dismantling.

Sorption traps are also known in the prior art, used mainly in vacuum systems to trap vapors or gases in order to prevent their penetration from one part of the vacuum system to another.

In particular, an adsorption trap (SU 1576737) is known, comprising a cylindrical body with inlet and outlet nozzles, a cartridge with an adsorbent coaxially placed in the housing, the inner cavity of which is in communication with an inlet nozzle placed on the cylindrical surface of the housing. In this case, the housing is equipped with end caps, one of which has an inlet pipe, and the caps are provided with cylindrical grooves. The cassette is made in the form of a squirrel wheel with elastic generators, inner and outer rings provided at their ends for fixing to the generators of an adsorbent made of sorption-active tissue, the rings being placed in the said cylindrical grooves. This trap is characterized by increased protective ability.

However, this design is designed for use in vacuum technology, and its use in flows, even under low pressure, can lead to leaks in the input and output connections.

An adsorption trap is also known (http://www.pro-vacuum.ru/primenenie-vakuumnoi-tekhniki/lovushki.html '). The trap is a section of the pipeline in which a sorbent is placed, which prevents the penetration of vapors and condensing gases.

However, this design of the sorption trap does not ensure the tightness of the compounds when using flows even at low pressures.

The adsorption traps VISI-TRAP and POSI-TRAP (http://www.eltm.ru/vakuumnve-lovushki-i-filtry.html/nid/1716) are also known in the art. The VISI-TRAP adsorption trap consists of a transparent plastic case with a filter of foreign particles to protect the pump from corrosion or vacuum from the flow of oil vapor from the pump. The design of the trap allows the placement of various filter elements (for water, oil or corrosive chemicals) and adapters for individual use, which can be replaced without opening the vacuum system. The POSI-TRAP adsorption trap is made in the form of a housing made of stainless steel, equipped with flanges for its placement at an angle of 180 ° or 90 ° to the production line, in which sealed filter elements are located at the inlet and outlet to ensure complete gas filtration. It is possible to use filters for various applications.

However, all vacuum systems are not designed for flows under atmospheric pressure; their seals may be leaky. In addition, as a rule, vacuum traps have a large free volume, which does not allow their use, for example, in chemisorption analyzers, where traps are installed between the reactor and the detector, and the volume of lines between them should be minimal so that the signal does not erode.

Closest to the claimed design is a portable holder with gas tubes containing sorbent (sorbent tubes) (US patent 4389372). Each tube with a sorbent has a conical region at opposite ends and openings for passing gas through the sorbent material. The holder contains end threaded bushings in which sealing rings are placed, which ensure the fixation of the tube with the sorbent and the sealing of the chamber with it.

The disadvantage of this solution is that the gas line is sealed on both sides of the tube; therefore, in order to replace the sorbent in the tube or the whole tube assembled with the sorbent, it is necessary to disassemble the structure in two places - on each side of the tube.

Utility Model Disclosure

The technical problem solved by this utility model is the creation of an adsorption trap with a minimum number of structural elements that provide high-quality, reliable and tight fastening of the inner tube with a sorbent, as well as simple and quick execution of technological work with the tube, including its complete replacement in assembly and / or replacing the sorbent in it.

The technical result of the proposed utility model is to simplify the assembly / disassembly of the adsorption trap (when installing or replacing the trap, replacing the tube or sorbent) while ensuring reliable sealing of the inner tube of the trap from the external environment.

The technical result is achieved through a constructive solution of the adsorption trap for removing impurities from the gas stream, which includes a housing in which the inlet and outlet channels for the gas flow are made, and a tube with a sorbent located in the housing having inlet and outlet ends, the tube being provided with a holder with providing its detachable tight connection with the housing, where the holder is made in the form of an insulating cylinder with a cavity for accommodating a tube plugged at one end at which the hexagon is positioned, the other end of the insulating cylinder is provided with an external thread for fixing the holder in the trap body, while the counterpart of the inner surface of the body is provided with an internal thread, the casing is made with a lodgement for tight placement of the reciprocal part of the tube, the input end of which is located on the side of the muffled end of the insulating cylinder, and the tube in the holder is placed with a gap between the outer surface of the tube and the inner surface of the insulating cylinder for the passage of gas from the input the housing to the inlet end of the tube with the sorbent and from the outlet end of the tube to the outlet channel of the housing.

The tight connection of the holder with the housing is realized by means of an O-ring. The tight placement of the tube in the tool tray is realized by means of an annular elastic seal and a pressure washer. The casing is made in the form of a body of revolution with a through axial channel, the casing having central and lateral cylindrical parts, where the central part is made larger in diameter compared to the side parts, in which the inlet channel is radially placed, part of the axial channel serves as a channel for the outlet gas stream, and the rest - to accommodate the tube holder with the sorbent. The insulating cylinder is provided on the outside with a seat for the O-ring. The tube is placed in the cavity of the insulating cylinder with an annular gap, providing free passage of gas. The tube can be made of glass or stainless steel.

The inventive design provides ease of assembly and maintenance of the adsorption trap during its operation, i.e. allows you to perform all the necessary actions with the inner tube, including replacing the whole assembly and / or replacing the sorbent in it.

Brief Description of the Drawings

The utility model is illustrated by drawings, where FIG. 1 is an assembly drawing, and FIG. 2 is a longitudinal section through an adsorption trap; FIG. 3-3D section of the housing of the adsorption trap, including the site of the tight placement of the inlet end of the tube in the housing, figure 4 - details of the adsorption trap indicating the specific dimensions (in millimeters), in accordance with which the prototype was made, figure 5 shows a photograph a prototype adsorption trap, in FIG. 6 is a photograph of an adsorption trap mounted on a panel of a chemisorption analyzer.

The positions in the figures indicate: 1 - body, 2 - insulating cylinder, 3-tube, 4 - O-ring, 5 - pressure washer, 6 - radial grooves, 7 - plugs made of quartz or glass wool, 8 - sorbent, 9 - threaded connections , 10 - turnkey hexagon part (hexagon) for tightening the threaded connection 9 between the insulating cylinder 2 and the housing 1, 11 - inlet port for gas, 12 - outlet port for gas, 13 - holes for attaching the housing 1, 14 - channels for gas flow, 15 - the cavity inside the insulating cylinder 2 to accommodate the inner tube 3.

Utility Model Implementation

Below is a more detailed description of the design of the claimed device.

The housing 1, the insulating cylinder 2 and the pressure plate 5 can be made of stainless steel (Fig. 1). In the housing 1 there are channels for gas flow 14, openings 13 for attachment to external devices (surfaces), inlet and outlet ports 11 and 12 for gas flows and connections with external devices, threaded connection 9 (thread) for securing the insulating cylinder 2. When this body is preferably made in the form of a body of revolution with a through axial channel, and has a Central and lateral cylindrical parts, while the Central part is made of a larger diameter compared to the side parts placed in it radially oriented independent channels for the inlet gas flow communication with the axial channel. A part of the axial channel serves as a channel for the outlet gas flow, and the remaining part is for placement of the tube holder with the sorbent. The tube holder 3 with sorbent 8 is made in the form of an insulating cylinder 2 with a cavity 15 for accommodating the tube 3. The insulating cylinder 2 is equipped with a hexagon 10 at its “blind” end and an external thread placed on the opposite end for fixing in the trap body. In this case, the counterpart of the inner surface of the housing is provided with an internal thread. The holder is made with the possibility of tight connection with the housing through the use of ring seals 4 and the pressure washer 5. To ensure reliable sealing of the internal space of the holder - the cavity 15 inside the insulating cylinder 2, from the external environment inside the housing 1 part of the surface in the area of the placement of the elastic rings 4 and the pressure the washers 5 are polished, and the insulating cylinder 2 is provided on the outside with a seat for the O-ring 4. On the side of the output port 12, the sealing bespechivaet by compressing the seal ring 4 disposed on the inner tube 3 by means of the pressing plate 5 when connecting the cylinder 2 with the insulating casing 1 and the tightening of the threaded connection 9 (Fig. 2). The O-ring 4 on the inner tube 3 is in contact with the polished cylindrical part of the housing 1 and the outer surface of the tube 3. When compressed, the O-ring 4 provides reliable sealing of the gap between the polished cylindrical part of the housing 1 and the outer surface of the tube 3. From the side of the threaded connection 9, sealing is provided by the O-ring 4, located on the outer surface of the insulating cylinder 2, which, when assembling the trap (screwing the insulating cylinder 2 into the housing 1 using thread 9) also mates with a polished surface inside the housing 1. O-rings 4 can be made of elastic materials selected depending on the composition of the gases, for example, silicone, various types of rubbers, etc.

Inside the insulating cylinder 2, the cavity 15 is cylindrical to accommodate the tube 3 with a gap sufficient for the free passage of gas (0.5-1 mm). Tube 3 can be made of glass or stainless steel. The inner tube 3 is filled with granular sorbent 8, which can be closed on both sides with layers of quartz or glass wool 7 to prevent rashes (Fig. 2). The tube 3 is held in axial position due to the fact that its end is 5 mm into the housing, and then it is aligned with an O-ring.

The trap is assembled as follows: put a clamping washer 5 and an O-ring onto the inner tube 3. Then, the inner tube 3 is inserted forward into the casing 1 with the O-ring 4 toward the outlet port 12, and an insulating cylinder 2 is installed on top of the tube, which is connected to the housing 1 by means of a threaded connection 9. In this case, the clamping of the insulating cylinder to the housing 1 is provided through a washer 5 and a sealing ring 4 located on the inner tube 3. After tightening the threaded connection 9, one or several ko through radial bores (holes) 6 formed in the body of the insulating cylinder form channels associated with the channel for the input gas stream 14, and the medium in the cavity 15 becomes completely isolated (sealed) from the outside environment by two annular gaskets 4.

During the operation of the adsorption trap, gas flows from an external source through the inlet port 11 and channel 14 into the housing 1, and then through one or more radial grooves 6 located at the end of the insulating cylinder 2 (in FIG. 1, one groove 6 is shown as an example), gas enters the annular gap between the outer surface of the tube 3 and the inner surface of the insulating cylinder, passes along the entire length of the tube 3 from its outer side and enters the inlet of the tube 3 located on the side of the “blind” end of the insulating cylinder 2, interacting 8 m with a sorbent that absorbs impurities therefrom. Already purified gas passes through the other end of the tube 3 and enters the outlet port 12 of the trap body 1 (Fig. 2).

As sorbents that remove water, zeolites such as NaA, NaX and others, or granular alkali can be used. To remove hydrocarbons, carbon sorbents can be used. Copper-containing sorbents can be used to absorb nitrogen oxides.

To replace the tube 3 with the sorbent 8 or to replace the sorbent 8, it is enough to unscrew the insulating cylinder from the housing and remove the tube 3 with the "spent" sorbent and then replace it with a new one.

To test the operation of the claimed device, a sample was made (Fig. 5), which had the overall dimensions (mm) indicated in Fig. four.

The device was installed in a chemisorption analyzer between the reactor and the detector and tested in water absorption (Fig. 6). As a sorbent that absorbs water, we used calcined NaA zeolite with a granule size of 0.25-0.50 mm. Nickel oxide was placed in the reactor of the chemisorption analyzer, which was reduced with a hydrogen-containing gas at elevated temperature, and water was released in the process. The mass spectrometric detector did not detect the presence of water in the stream after the adsorption trap, which indicates the operability of this device.

Claims (7)

1. An adsorption trap for removing impurities from the gas stream, including a housing in which the inlet and outlet channels for the gas stream are made, and a tube with a sorbent located in the housing, having an inlet and outlet ends, characterized in that the trap is provided with a tube holder to ensure it detachable tight connection with the housing, where the holder is made in the form of an insulating cylinder with a cavity for accommodating a tube plugged at one end on which the hexagon is placed, the other end of the insulating cylinder is sn abzhen with an external thread for fixing the holder in the trap body, while the counterpart of the inner surface of the body is provided with an internal thread, the body is made with a lodgement for hermetically accommodating the counterpart of the tube, the input end of which is placed on the side of the muffled end of the cylinder, and the tube in the holder is placed with a gap between the outer surface of the tube and the inner surface of the insulating cylinder for the passage of gas from the inlet channel of the housing to the inlet end of the tube with the sorbent and from the outlet end of the tube Bq to the output channel. 2. The adsorption trap according to claim 1, characterized in that the hermetic connection of the holder to the housing is realized by means of an elastic ring seal. 3. The adsorption trap according to claim 1, characterized in that the hermetic placement of the tube in the lodgement is realized by means of an elastic ring seal and a pressure washer. 4. The adsorption trap according to claim 1, characterized in that the housing is made in the form of a body of revolution with a through axial channel having a central and lateral cylindrical parts, while the central part is made of a larger diameter compared to the side parts in which the input channel is radially placed , and part of the axial channel serves as a channel for the outlet gas stream, and the remaining part - for placement of the tube holder with the sorbent. 5. The adsorption trap according to claim 2, characterized in that the insulating cylinder is provided on the outside with a seat for an annular seal. 6. The adsorption trap according to claim 1, characterized in that the tube is placed in the cavity of the insulating cylinder with an annular gap, providing free passage of gas. 7. The adsorption trap according to claim 1, characterized in that the tube is made of glass or stainless steel.

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