Gas drying device for purification

Abstract

The gas drying device for purification comprises a gas inlet main pipe and two exhaust main pipes, the gas inlet main pipe is connected with two gas inlet branch pipes through a first tee joint, the gas inlet branch pipes are connected with back-flushing exhaust pipes, the gas inlet branch pipes are connected with two drying and purifying mechanisms through second tee joints respectively, the number of the four drying and purifying mechanisms is four, and every two drying and purifying mechanisms form a group. The main exhaust pipes are respectively connected with the two drying and purifying mechanisms in the same group through a fourth tee joint, the two main exhaust pipes are communicated through a backflushing gas inlet pipe, each drying and purifying mechanism comprises three gas treatment units which are connected in series, each gas treatment unit comprises a labyrinth filter and a medium cylinder which are connected with each other, and the gas treatment units are connected through a third tee joint. And the third tee joints at the same positions in the same group of drying and purifying mechanisms are also connected through a side communicating pipe provided with a fourth valve. The device can effectively solve the problem of powder filtration in the molecular sieve dryer, so that the operation efficiency is improved, the pulverization condition of an operation medium can be effectively monitored, and the failure of the molecular sieve dryer is avoided.

Description

Technical Field

[0001] The invention relates to the technical field of gas purification, and in particular to a gas drying device for purification. Background Art

[0002] Gas purification is one of the essential processes in gas production. Molecular sieve dryer is one of the gas purification devices, mainly used to remove water and other trace impurities and trace impurities in crude synthesis gas. Therefore, the operation status of molecular sieve drying device directly affects the subsequent gas production operation.

[0003] The operating medium in the molecular sieve dryer mainly includes alumina and molecular sieve. The gas passes through alumina-molecular sieve-alumina in turn to remove water-impurities and impurities and impurities-water. Under the impact of the gas, the molecular sieve and alumina will gradually pulverize. Therefore, a filter must be set at the output end of the molecular sieve dryer to intercept the powder, otherwise the powder will enter the subsequent processing device and destroy the operation of the subsequent device. The filter basically uses a filter element or a filter cartridge to intercept the powder. However, the current situation is that when only one filter is set, after the powder content of the exhaust gas exceeds a certain threshold, the powder will break through the filter element in the filter, which requires frequent shutdown to replace the filter element, resulting in reduced production efficiency; if multiple filters are connected in series and then connected in parallel to solve the problem, when one or more filter elements in the series filter are close to full load, the resistance of the entire drying gas path suddenly increases. Although switching to another set of filters in parallel can avoid shutdown, it is impossible to confirm the load of each filter element in the series filter when replacing the filter element, which increases the filter element consumption and leads to high costs.

[0004] In view of this, a gas drying device for purification is designed to effectively solve the powder filtration problem in the molecular sieve dryer. It can not only effectively extend the interval between shutdowns for filter replacement and improve operating efficiency, but also effectively monitor the powderization of the operating medium during operation to avoid failure of the molecular sieve dryer. Summary of the invention

[0005] The object of the present invention is to provide a gas drying device for purification to solve the problems described in the background art.

[0006] The technical solution of the present invention is achieved in this way:

[0007] A gas drying device for purification comprises an intake manifold and two exhaust manifolds, one end of the intake manifold is connected to a first tee, two ends of the first tee are respectively connected to an intake branch pipe, a first valve is arranged in the intake branch pipe, a recoil exhaust pipe is connected to the intake branch pipe downstream of the first valve, a second valve is arranged on the recoil exhaust pipe, the other end of the intake branch pipe is connected to a second tee, two ends of the second tee are respectively connected to drying and purification mechanisms, a total of four drying and purification mechanisms are provided, two drying and purification mechanisms form a group, an exhaust valve is further arranged on the exhaust manifold, one end of the exhaust manifold is connected to a fourth tee, two ends of the fourth tee are respectively connected to two drying and purification mechanisms in the same group, the two exhaust manifolds are also connected through a recoil intake pipe, a fifth valve is further arranged in the recoil intake pipe, and the recoil intake pipe is arranged on the exhaust manifold between the fourth tee and the fifth valve;

[0008] The drying and purification mechanism comprises at least three gas processing units which are sequentially connected in series, wherein the gas processing unit comprises a labyrinth filter and a horizontally placed medium cylinder, and the labyrinth filter and the medium cylinder are connected;

[0009] The two ends of the medium cylinder are respectively connected to the first ventilation pipe, and a breathable medium bin is also provided inside the medium cylinder. The medium bins at the two ends of the drying and purification mechanism are provided with drying medium, and the medium bin in the middle of the drying and purification mechanism is provided with purification medium;

[0010] The labyrinth filter comprises an air box, the two ends of the air box are respectively connected with second ventilation pipes, a labyrinth airway connecting the two ends of the second ventilation pipes is arranged in the air box, a discharge port is arranged at the bottom of the air box, and a detachable sealing cover at the discharge port is provided with a box cover;

[0011] In a gas processing unit, a first vent pipe at one end of the medium cartridge is connected to a front valve, a first vent pipe at the other end of the medium cartridge is connected to a second vent pipe at one end of a labyrinth filter, and a second vent pipe at the other end of the labyrinth filter is connected to a rear valve;

[0012] In a drying and purification mechanism, the rear valve in a gas processing unit is also connected to the front valve in an adjacent gas processing unit through a third three-way connection;

[0013] In a drying and purification mechanism, a front valve in a gas processing unit at one end of the drying and purification mechanism is connected to the second three-way connection, and a rear valve in a gas processing unit at the other end of the drying and purification mechanism is connected to one end of a fourth three-way connection;

[0014] In a set of drying and purification mechanisms, two third tees arranged at the same position are also connected by a side connecting pipe, and a fourth valve is also arranged in the side connecting pipe.

[0015] When using the above scheme, the gas to be treated is charged from the air intake manifold, one of the two first valves is opened and the other is closed, and the gas enters the air intake branch pipe with the first valve opened. The gas first passes through the medium cylinder of the gas treatment unit at the front end of the drying and purification mechanism, is dried by the drying medium in the medium cylinder at the front end, and some powder is removed through the labyrinth filter of the gas treatment unit at the front end, and then enters the medium cylinder of the gas treatment unit in the middle of the drying and purification mechanism, and impurities and miscellaneous gases are adsorbed by the purification medium in the middle medium cylinder, and some powder is removed through the labyrinth filter, and finally enters the gas treatment unit equipped with drying medium again to remove moisture and filter powder again. The treated gas enters the exhaust manifold through the fourth three-way and is discharged into the subsequent processing device.

[0016] Among them, one of the two exhaust valves is closed and the other is opened. When the treated gas needs to be recoiled to another set of drying and purification mechanisms, the fifth valve is opened, and the treated gas enters another exhaust main pipe through the recoil intake pipe, and then passes through another set of drying and purification mechanisms in reverse, and finally is discharged from the recoil exhaust pipe. At this time, the first valve and the exhaust valve connected to the set of drying and purification mechanisms being recoiled are in a closed state, and the second valve is in an open state.

[0017] When the device is running, the flow path of the gas in the two drying and purification mechanisms in the same group can be selected by controlling the switch of the front valve, the rear valve and the fourth valve in the side connecting pipe downstream of the gas processing unit, which makes it possible to keep the device running continuously while checking the gas box of the labyrinth filter in the gas processing unit. The operation method is as follows:

[0018] For the convenience of description, the two drying and purification mechanisms in the same group of drying and purification mechanisms are defined as mechanism No. 1 and mechanism No. 2 (hereinafter referred to as mechanism No. 1 and mechanism No. 2), and the gas processing unit to be checked is in working state. If the gas processing unit to be checked is in mechanism No. 1, then find another gas processing unit in the same position in mechanism No. 2, and open the front valve and the rear valve of the gas processing unit in mechanism No. 2. At this time, the fourth valve of the side connecting pipe at the downstream of the two gas processing units has two initial states.

[0019] The first initial state is the open state, that is, the downstream of the No. 1 gas processing unit is connected to the next gas processing unit No. 2. In the first state, the fourth valve is closed first and then the front valve and the rear valve of the No. 1 gas processing unit are closed. The gas flow route is switched to flow from the newly opened gas processing unit No. 2 to the next gas processing unit No. 2.

[0020] The second initial state is a closed state, that is, the downstream of the No. 1 gas processing unit is connected to the next gas processing unit No. 1. In the second state, the fourth valve is opened first and then the front valve and the rear valve of the No. 1 gas processing unit are closed, and the gas flow route is switched to flow from the newly opened No. 2 gas processing unit to the next gas processing unit No. 1.

[0021] At this time, the box cover at the bottom of the air box of the maze filter box of the gas processing unit to be processed in No. 1 can be removed to discharge the trapped powder in the maze airway. At the same time, the powdering condition of the medium in the medium cylinder in the gas processing unit can be confirmed by observing the discharge amount of powder to decide whether the medium in the medium cylinder needs to be replaced.

[0022] By setting a labyrinth filter in each gas processing unit, the centrifugal force of the gas flowing back and forth in the labyrinth airway is used to throw the powder in the gas onto the labyrinth airway, and the powder sinks to the bottom of the gas box by gravity. Compared with the filter with a filter element, the labyrinth filter saves the cost of replacing the filter element, and at the same time intercepts the powder generated by the current gas processing unit, preventing the powder from entering the next gas processing unit, preventing the airflow from carrying the powder and hitting the medium in the next gas processing unit, reducing the powderization rate of the medium, extending the service life of the medium, and reducing the amount of powder carried by the gas discharged from the exhaust main pipe, extending the service life of the filter element of the subsequent filter with a filter element.

[0023] A further technical solution is that the medium bin includes two baffle nets spaced apart in the medium bin, the baffle nets are vertically arranged, the edges of the baffle nets are fixedly connected to the medium tube, and the two baffle nets and the inner wall of the medium tube together form the medium bin.

[0024] When the above solution is used, the baffle is used to restrict the drying medium and the purification medium so that they are stored in the medium bin, while the baffle can allow the gas to penetrate.

[0025] A further technical solution is that the top and bottom of the medium cylinder are respectively connected with a feed pipe, the feed pipe is arranged within the range of the medium bin, and the terminal end of the feed pipe is provided with a detachable sealing cover.

[0026] When the above solution is used, the dry medium or the purified medium can be added into the medium bin through the top feeding pipe, and the dry medium or the purified medium can be removed through the bottom feeding pipe, so that the medium in the medium cylinder can be replaced easily.

[0027] A further technical solution is that the air box is a rectangular box body, a connecting plate is fixedly sleeved on the bottom of the side wall of the air box, and the box cover is detachably mounted with the bottom of the connecting plate.

[0028] A further technical solution is that the labyrinth airway includes a plurality of partitions arranged in the air box, the plurality of partitions are spaced apart from each other, the second ventilation pipe is arranged on the front and rear side walls of the air box, the left and right ends of the partition are sealedly connected to the left and right side walls of the air box, the top of a portion of the partition is sealedly connected to the top wall of the air box and the bottom of this portion of the partition does not extend to the bottom of the air box, the bottom of another portion of the partition extends to the bottom of the air box and is sealedly connected to the box cover and the top of this portion of the partition does not extend to the top of the air box.

[0029] When using the above scheme, after the gas enters the air box from the second ventilation pipe, it moves back and forth up and down inside the air box under the action of the partition. Under the action of the maze airway, the powder is thrown onto the air box wall and the partition by centrifugal force, and settles on the upper end of the box cover under the action of gravity. After opening the box cover, the powder can be removed.

[0030] A further technical solution is that the drying medium is aluminum oxide particles.

[0031] A further technical solution is that the purification medium is a molecular sieve.

[0032] A further technical solution is that an exhaust branch pipe is connected to the second ventilation pipe downstream of each air box, and a sixth valve is provided on the exhaust branch pipe. The purification gas drying device also includes an exhaust pump, the outlet of the exhaust pump is connected to the air intake main pipe through a pipeline, the inlet of the exhaust pump is also connected to the exhaust main pipe, and the exhaust branch pipe is connected to the exhaust main pipe.

[0033] When using the above solution, when a gas processing unit needs to be inspected, after isolating the gas processing unit, open the sixth valve and start the vacuum pump to pump the gas to be processed in the gas processing unit to the air intake main pipe. When the gas is exhausted, open the cover of the gas box to avoid wasting this part of the gas and avoid unnecessary harm to the inspectors.

[0034] A further technical solution is that the gas processing unit in which the front valve is connected to the second tee also includes a front bend pipe, one end of which is connected to the front valve, and the other end of which is connected to the first ventilation pipe of the medium cylinder; the gas processing unit in which the rear valve is connected to the fourth tee also includes a rear bend pipe, one end of which is connected to the rear valve, and the other end of which is connected to the second ventilation pipe of the air box.

[0035] When the above solution is used, the arrangement of the entire device is made more concise and smooth by providing the front curved pipe and the rear curved pipe.

[0036] The beneficial effects of the present invention are:

[0037] 1. Efficient drying and purification: Through the multi-stage drying and purification mechanism, the gas goes through the process of drying, purification and re-drying to effectively remove moisture, impurities and powder and improve gas quality.

[0038] 2. Flexible gas path control: By controlling the valve switch, the gas flow path in the two drying and purification mechanisms in the same group can be flexibly selected, which is convenient for maintenance and overhaul without interrupting the operation of the device.

[0039] 3. Easy maintenance and inspection: The design allows the labyrinth filter to be inspected while the device is running without stopping the machine, which improves operating efficiency. At the same time, the powder discharge volume can be visually observed, the medium condition can be judged in time, and replacement can be arranged conveniently.

[0040] 4. Cost saving: The use of labyrinth filters instead of traditional filters with filter elements reduces the cost of filter element replacement, effectively intercepts powder, reduces the powderization rate of the media, and extends the service life of the media and subsequent filter elements.

[0041] 5. Effective use of gas: When a gas processing unit needs to be inspected, after isolating the gas processing unit, open the sixth valve and start the vacuum pump to pump the gas to be processed in the gas processing unit to the air intake main pipe. When the gas is exhausted, open the cover of the gas box to avoid waste of this part of the gas and avoid unnecessary harm to the inspectors. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a general schematic diagram of the present invention (viewed from above);

[0043] Figure 2 It is a cross-sectional schematic diagram (side view) of a medium cartridge provided with a purification medium;

[0044] Figure 3 It is a cross-sectional schematic diagram (side view) of a medium cylinder provided with a drying medium;

[0045] Figure 4 It is an enlarged schematic diagram of the maze filter (viewed from above);

[0046] Figure 5 It is a schematic cross-sectional view of a labyrinth filter (side view).

[0047] In the figure, 1, intake main pipe, 2, first three-way, 3, first valve, 4, intake branch pipe, 5, recoil exhaust pipe, 6, second valve, 7, second three-way, 8, front valve, 9, front elbow, 10, medium cylinder, 11, labyrinth filter, 12, rear valve, 13, third three-way, 14, side connecting pipe, 15, fourth valve, 16, rear elbow, 17, fourth three-way, 18, exhaust main pipe, 19, recoil intake pipe, 20, fifth valve, 21, exhaust branch pipe, 22, sixth valve, 23, exhaust main pipe, 24, exhaust pump, 25, first ventilation pipe, 26, feed pipe, 27, baffle, 28, molecular sieve, 29, alumina particles, 30, second ventilation pipe, 31, air box, 32, partition, 33, connecting plate, 34, labyrinth airway, 35, box cover. DETAILED DESCRIPTION

[0048] In order to better understand the technical content of the present invention, specific embodiments are provided below, and the present invention is further described in conjunction with the accompanying drawings.

[0049] It should be noted that the concepts such as “first” and “second” mentioned in the present disclosure are only used to distinguish components in different positions, and are not used to limit the order or interdependence of these components.

[0050] See also Figures 1 to 5 A gas drying device for purification includes an intake manifold 1 and two exhaust manifolds 18, wherein one end of the intake manifold 1 is connected to a first tee 2, and two ends of the first tee 2 are respectively connected to an intake branch pipe 4, a first valve 3 is provided in the intake branch pipe 4, a recoil exhaust pipe 5 is connected to the intake branch pipe 4 downstream of the first valve 3, and a second valve 6 is provided on the recoil exhaust pipe 5, the other end of the intake branch pipe 4 is connected to a second tee 7, and two ends of the second tee 7 are respectively connected to drying and purification mechanisms, a total of four drying and purification mechanisms, two drying and purification mechanisms form a group, an exhaust valve is also provided on the exhaust manifold 18, one end of the exhaust manifold 18 is connected to a fourth tee 17, and two ends of the fourth tee 17 are respectively connected to two drying and purification mechanisms in the same group, the two exhaust manifolds 18 are also connected through a recoil intake pipe 19, a fifth valve 20 is also provided in the recoil intake pipe 19, and the recoil intake pipe 19 is arranged on the exhaust manifold 18 between the fourth tee 17 and the fifth valve 20.

[0051] The drying and purification mechanism includes three gas processing units which are sequentially connected in series. The gas processing unit includes a labyrinth filter 11 and a horizontally placed medium cartridge 10. The labyrinth filter 11 and the medium cartridge 10 are connected.

[0052] Both ends of the medium cylinder 10 are connected to first ventilation pipes 25 respectively. A breathable medium bin is also provided inside the medium cylinder 10. Drying medium is provided in the medium bins at both ends of the drying and purification mechanism, and purification medium is provided in the medium bin in the middle of the drying and purification mechanism.

[0053] Specifically, the medium bin includes two baffle nets 27 spaced apart in the medium bin, the baffle nets 27 are vertically arranged, the edges of the baffle nets 27 are fixedly connected to the medium tube 10, and the two baffle nets 27 and the inner wall of the medium tube 10 together form the medium bin.

[0054] Specifically, the top and bottom of the medium cylinder 10 are respectively connected with a feed pipe 26, which is arranged within the range of the medium bin, and the terminal end of the feed pipe 26 is provided with a detachable sealing cover.

[0055] Preferably, the drying medium is alumina particles 29 .

[0056] Preferably, the purification medium is molecular sieve 28 .

[0057] The labyrinth filter 11 includes an air box 31, both ends of which are respectively connected to second ventilation pipes 30, a labyrinth airway 34 connecting the second ventilation pipes 30 at both ends is provided in the air box 31, a discharge port is provided at the bottom of the air box 31, and a detachable sealing cover at the discharge port is provided with a box cover 35.

[0058] Specifically, the air box 31 is a rectangular parallelepiped box body, a connecting plate 33 is fixedly sleeved on the bottom of the side wall of the air box 31, and the box cover 35 is detachably mounted on the bottom of the connecting plate 33.

[0059] Specifically, the labyrinth air duct 34 includes a plurality of partitions 32 arranged in the air box 31, and the plurality of partitions 32 are spaced apart from each other. The second ventilation pipe 30 is arranged on the front and rear side walls of the air box 31, and the left and right ends of the partitions 32 are sealedly connected to the left and right side walls of the air box 31. The top of a portion of the partition 32 is sealedly connected to the top wall of the air box 31, and the bottom of this portion of the partition 32 does not extend to the bottom of the air box 31. The bottom of another portion of the partition 32 extends to the bottom of the air box 31 and is sealedly connected to the box cover 35, and the top of this portion of the partition 32 does not extend to the top of the air box 31.

[0060] Preferably, a soft cushion is provided at the center of the box cover 35 for abutting against the bottom of the partition 32 , and a sealing ring is provided between the box cover 35 and the connecting plate 33 .

[0061] In a gas processing unit, the first ventilation pipe 25 at one end of the medium cylinder 10 is connected to the front valve 8, and the first ventilation pipe 25 at the other end of the medium cylinder 10 is connected to the second ventilation pipe 30 at one end of the labyrinth filter 11, and the second ventilation pipe 30 at the other end of the labyrinth filter 11 is connected to the rear valve 12.

[0062] In a drying and purification mechanism, the rear valve 12 in a gas processing unit is also connected to the front valve 8 in an adjacent gas processing unit through the third three-way 13.

[0063] In a set of drying and purification mechanisms, two third three-way valves 13 arranged at the same position are also connected by a side connecting pipe 14, and a fourth valve 15 is also arranged in the side connecting pipe 14.

[0064] In a drying and purification mechanism, the front valve 8 in the gas processing unit at one end of the drying and purification mechanism is connected to the second three-way valve 7, and the rear valve 12 in the gas processing unit at the other end of the drying and purification mechanism is connected to one end of the fourth three-way valve 17.

[0065] Preferably, the gas processing unit in which the front valve 8 is connected to the second three-way valve 7 also includes a front bend pipe 9, one end of which is connected to the front valve 8, and the other end of which is connected to the first ventilation pipe 25 of the medium cylinder 10. The gas processing unit in which the rear valve 12 is connected to the fourth three-way valve 17 also includes a rear bend pipe 16, one end of which is connected to the rear valve 12, and the other end of which is connected to the second ventilation pipe 30 of the air box 31.

[0066] Among them, the second ventilation pipe 30 downstream of each air box 31 is also connected to an exhaust branch pipe 21, and the exhaust branch pipe 21 is also provided with a sixth valve 22. The gas drying device for purification also includes an exhaust pump 24, and the outlet of the exhaust pump 24 is connected to the air intake main pipe 1 through a pipeline. The inlet of the exhaust pump 24 is also connected to the exhaust main pipe 23, and the exhaust branch pipe 21 is connected to the exhaust main pipe 23.

[0067] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A gas drying device for purification, characterized in that: It comprises an intake manifold and two exhaust manifolds, one end of the intake manifold is connected to a first tee, two ends of the first tee are respectively connected to an intake branch pipe, a first valve is arranged in the intake branch pipe, a recoil exhaust pipe is connected to the intake branch pipe downstream of the first valve, a second valve is arranged on the recoil exhaust pipe, the other end of the intake branch pipe is connected to a second tee, two ends of the second tee are respectively connected to drying and purification mechanisms, a total of four drying and purification mechanisms are formed, and two drying and purification mechanisms form a group, an exhaust valve is also arranged on the exhaust manifold, one end of the exhaust manifold is connected to a fourth tee, two ends of the fourth tee are respectively connected to two drying and purification mechanisms in the same group, the two exhaust manifolds are also connected through a recoil intake pipe, a fifth valve is also arranged in the recoil intake pipe, and the recoil intake pipe is arranged on the exhaust manifold between the fourth tee and the fifth valve; The drying and purification mechanism comprises at least three gas processing units which are sequentially connected in series, the gas processing unit comprises a labyrinth filter and a horizontally placed medium cylinder, the labyrinth filter and the medium cylinder are connected; The two ends of the medium cylinder are respectively connected to the first ventilation pipe, and a breathable medium bin is also provided inside the medium cylinder. The medium bins at the two ends of the drying and purification mechanism are provided with drying medium, and the medium bin in the middle of the drying and purification mechanism is provided with purification medium; The labyrinth filter comprises an air box, the two ends of the air box are respectively connected with second ventilation pipes, a labyrinth airway connecting the two ends of the second ventilation pipes is arranged in the air box, a discharge port is arranged at the bottom of the air box, and a detachable sealing cover at the discharge port is provided with a box cover; In a gas processing unit, a first vent pipe at one end of the medium cartridge is connected to a front valve, a first vent pipe at the other end of the medium cartridge is connected to a second vent pipe at one end of a labyrinth filter, and a second vent pipe at the other end of the labyrinth filter is connected to a rear valve; In a drying and purification mechanism, the rear valve in a gas processing unit is also connected to the front valve in an adjacent gas processing unit through a third three-way connection; In a drying and purification mechanism, a front valve in a gas processing unit at one end of the drying and purification mechanism is connected to the second three-way connection, and a rear valve in a gas processing unit at the other end of the drying and purification mechanism is connected to one end of a fourth three-way connection; In a set of drying and purification mechanisms, two third tees arranged at the same position are also connected by a side connecting pipe, and a fourth valve is also arranged in the side connecting pipe.

2. A gas drying device for purification according to claim 1, characterized in that: The medium bin comprises two baffle nets spaced apart in the medium bin, the baffle nets are arranged vertically, the edges of the baffle nets are fixedly connected to the medium tube, and the two baffle nets and the inner wall of the medium tube together form the medium bin.

3. A gas drying device for purification according to claim 2, characterized in that: The top and bottom of the medium cylinder are respectively connected with a feeding pipe, the feeding pipe is arranged within the range of the medium bin, and the end of the feeding pipe is provided with a detachable sealing cover.

4. A gas drying device for purification according to claim 1, characterized in that: The air box is a rectangular box body, the bottom of the side wall of the air box is fixedly sleeved with a connecting plate, and the box cover is detachably mounted with the bottom of the connecting plate.

5. A gas drying device for purification according to claim 4, characterized in that: The labyrinth air duct includes a plurality of partitions arranged in the air box, and the plurality of partitions are spaced apart from each other. The second ventilation pipe is arranged on the front and rear side walls of the air box, and the left and right ends of the partitions are sealedly connected to the left and right side walls of the air box. The top of a portion of the partitions is sealedly connected to the top wall of the air box and the bottom of this portion of the partitions does not extend to the bottom of the air box, and the bottom of another portion of the partitions extends to the bottom of the air box and is sealedly connected to the box cover and the top of this portion of the partitions does not extend to the top of the air box.

6. A gas drying device for purification according to claim 1, characterized in that: The drying medium is alumina particles.

7. A gas drying device for purification according to claim 1, characterized in that: The purification medium is a molecular sieve.

8. A gas drying device for purification according to claim 1, characterized in that: The second ventilation pipe downstream of each air box is also connected to an exhaust branch pipe, and the exhaust branch pipe is also provided with a sixth valve. The gas drying device for purification also includes an exhaust pump, the outlet of the exhaust pump is connected to the air intake main pipe through a pipeline, and the inlet of the exhaust pump is also connected to the exhaust main pipe, and the exhaust branch pipe is connected to the exhaust main pipe.

9. A gas drying device for purification according to claim 1, characterized in that: The gas processing unit in which the front valve is connected to the second tee also includes a front bend pipe, one end of which is connected to the front valve, and the other end of which is connected to the first ventilation pipe of the medium cylinder. The gas processing unit in which the rear valve is connected to the fourth tee also includes a rear bend pipe, one end of which is connected to the rear valve, and the other end of which is connected to the second ventilation pipe of the air box.

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