Regeneration system of adsorbent for hydrogen purification

Abstract

The utility model provides a regeneration system of an adsorbent for hydrogen purification, which comprises an adsorption tank I and an adsorption tank II, the bottoms of the adsorption tanks are respectively communicated with a gas inlet pipe, the tops of the adsorption tanks are respectively communicated with an exhaust pipe, a backflushing pipe is communicated between the tops of the adsorption tank I and the adsorption tank II, and inverted conical mesh covers are respectively fixed in the adsorption tank I and the adsorption tank II. The bottom of the net cover is communicated with the emptying device through an emptying pipe, the lower end of the net cover is communicated with the air inlet pipe through an air inlet disc, the outer conical surface below the net cover is sleeved with a conical cover attached to the outer conical surface, and the conical cover can vertically ascend and descend through a telescopic rod and is arranged on a pipe opening of the emptying pipe at the bottom in a sleeving mode. According to the regeneration system of the adsorbent for hydrogen purification, the adsorbent is distributed in a conical shape through the conical net cover, and the adsorption effect is improved. During pressure relief desorption, a conical channel is formed between the mesh enclosure and the conical cover, and impurity gas passes through the conical side wall of the mesh enclosure and is discharged into the conical channel, so that the discharge area is increased, the discharge distance is shortened, the resistance is reduced, and the discharge speed is increased.

Description

Technical Field

[0001] This application relates to the pressure swing adsorption technology for gas purification, and particularly to a regeneration system for adsorbents used in hydrogen purification. Background Art

[0002] Pressure swing adsorption is a new type of gas adsorption and separation technology. The adsorbent can repeatedly adsorb and purify under pressure, and then desorb under reduced pressure to regenerate the adsorbent. The operation is simple, enabling continuous cyclic production, and the produced product has a high purity.

[0003] Existing hydrogen purification devices use the principle of pressure swing adsorption. Two adsorption tanks alternately perform pressure adsorption and desorption regeneration. The gas enters from the bottom of the adsorption tank and passes upward through the adsorbent for purification. When desorbing to regenerate the adsorbent, the impurity gas is ejected upward from the bottom in the reverse direction.

[0004] In existing hydrogen purification devices, the adsorbent is distributed in a cylindrical shape inside the tank. When the adsorbent is regenerated, the discharge area for the upward ejection of the impurity gas is equal to the diameter of the adsorbent distribution. The discharge area is small, and the impurity gas needs to move vertically upward in the tank in the reverse direction. The discharge distance of the gas is long, and the resistance is large, affecting the discharge efficiency of the impurity gas. Summary of the Utility Model

[0005] This application provides a regeneration system for adsorbents used in hydrogen purification to solve the problem of low efficiency in discharging impurity gas in existing hydrogen purification devices.

[0006] This application provides a regeneration system for adsorbents used in hydrogen purification, including adsorption tank one and adsorption tank two. Their bottoms are respectively connected to the inlet pipe, and their tops are respectively connected to the exhaust pipe. A backflush pipe is connected between the tops of adsorption tank one and adsorption tank two. Inside adsorption tank one and adsorption tank two, inverted conical mesh covers are respectively fixed, and the bottoms are connected to a venting device through a vent pipe. The lower end of the mesh cover is connected to the inlet pipe through an air inlet disc. A conical cover that fits closely is sleeved on the outer conical surface below the mesh cover. The conical cover can be vertically lifted and lowered by a telescopic rod and is sleeved on the nozzle of the bottom vent pipe. Two independently opened and closed valves are installed on the inlet pipe, exhaust pipe, and vent pipe.

[0007] Optionally, the telescopic rod is a cylinder, a hydraulic cylinder, or an electric push rod.

[0008] Optionally, vertical pipes are respectively fixed at the upper ends inside adsorption tank one and adsorption tank two, and the tops are connected to the vertical pipes through two backflush pipes respectively. A gas distribution disc is installed at the lower end of the vertical pipe.

[0009] Optionally, the gas distribution disc is composed of multiple bent pipes that can spray spirally.

[0010] Optionally, the mouth of the lower end of the conical cover can be sealed with the side wall of the intake disk and the bottom inside the first adsorption tank and the second adsorption tank.

[0011] Compared with the prior art, the beneficial effects of the adsorbent regeneration system for hydrogen purification provided by this application are as follows:

[0012] The conical cover can move up and down through the telescopic rod. When it moves to the upper end and fits and seals with the mesh cover, it is used for adsorption and purification. Through the mesh cover, the adsorbent is distributed in a conical shape, and the cross-sectional area gradually increases during adsorption, which can effectively improve the adsorption effect of the diffusely rising gas.

[0013] When the conical cover moves to the lower end and fits and seals with the bottom of the tank body, it is used for pressure relief and desorption. A conical channel is formed between the mesh cover and the conical cover. The impurity gas can pass through the conical side wall of the mesh cover and be discharged into the conical channel. The conical side wall of the mesh cover increases the discharge area, shortens the discharge distance of the impurities inside the adsorbent, reduces the resistance, and improves the discharge speed of the impurity gas. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of this application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0015] Figure 1 It is a schematic structural diagram of an adsorbent regeneration system for hydrogen purification provided by an embodiment of this application;

[0016] Figure 2 It is an adsorbent regeneration system for hydrogen purification provided by an embodiment of this application Figure 1 of a cross-sectional view;

[0017] Figure 3 It is a connection schematic diagram of two backflush pipes of an adsorbent regeneration system for hydrogen purification provided by an embodiment of this application;

[0018] Figure 4 It is a top view of the air distribution disk elbow of an adsorbent regeneration system for hydrogen purification provided by an embodiment of this application.

[0019] Description of the Reference Numerals:

[0020] The first adsorption tank 1; the second adsorption tank 2; the vent 3; the inlet pipe 4; the exhaust pipe 5; the backflush pipe 6; the mesh cover 7; the conical cover 8; the telescopic rod 9; the intake disk 10; the vent pipe 11; the vertical pipe 12; the air distribution disk 13. Detailed Embodiments

[0021] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the following clearly and completely describes the technical solutions in the embodiments of this application. Apparently, the described embodiments are some, rather than all, of the embodiments of this application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts also belong to the scope of protection of this application.

[0022] As Figures 1-4 shown, an embodiment of this application provides a regeneration system for an adsorbent for hydrogen purification, including an adsorption tank 1 and an adsorption tank 2. Their bottoms are respectively connected to an air inlet pipe 4, and their tops are respectively connected to an exhaust pipe 5. A backwash pipe 6 is connected between the tops of the adsorption tank 1 and the adsorption tank 2. In the adsorption tank 1 and the adsorption tank 2, inverted conical mesh covers 7 are respectively fixed, and the bottoms are connected to a venting device 3 through a vent pipe 11. The lower end of the mesh cover 7 is connected to the air inlet pipe 4 through an air inlet disc 10. A conical cover 8 that fits it is sleeved on the outer conical surface below the mesh cover 7. The conical cover 8 can be vertically lifted and lowered through a telescopic rod 9 and is sleeved on the pipe orifice of the bottom vent pipe 11. Two independently opened and closed valves are installed on each of the air inlet pipe 4, the exhaust pipe 5, and the vent pipe 11.

[0023] During use, the adsorbent is filled in the mesh cover 7, and the adsorption tank 1 and the adsorption tank 2 are alternately used for adsorption purification by controlling multiple valves. When the adsorption tank 2 is performing adsorption purification, the conical cover 8 in the adsorption tank 2 moves to the upper end and fits and seals with the outer conical surface of the mesh cover 7; the conical cover 8 in the adsorption tank 1 moves to the lower end and is sleeved on the vent pipe 11 and fits and seals with the bottom of the tank body.

[0024] Hydrogen enters the pressurized adsorption tank 2 through the air inlet pipe 4, enters the mesh cover 7 through the air inlet disc 10 at the lower end, and then passes upward through the adsorbent in the mesh cover 7 for adsorption purification. At this time, the adsorption tank 1 is in a pressure relief and desorption state. Most of the hydrogen after adsorption purification is discharged upward through the exhaust pipe 5, and a small part is reversely introduced into the adsorption tank 1 through the backwash pipe 6, and the impurity gas desorbed from the adsorbent is pushed out downward from top to bottom. The impurity gas desorbed from the adsorbent in the adsorption tank 1 is subjected to the reverse thrust of the hydrogen at the upper end, passes through the conical side wall of the mesh cover 7 and is discharged into the conical channel between the mesh cover 7 and the conical cover 8, and then passes downward through the vent pipe 11 and is discharged from the venting device 3.

[0025] When the adsorption tank 1 is performing adsorption purification, the states in the two tanks are opposite. The conical cover 8 in the adsorption tank 1 moves to the upper end and fits and seals with the outer conical surface of the mesh cover 7 for adsorption purification, and the conical cover 8 in the adsorption tank 2 moves to the lower end to form a conical channel for pressure relief, desorption, and reverse impurity discharge. The two tanks alternately complete pressure swing adsorption.

[0026] In this embodiment, the conical cover 8 can move up and down through the telescopic rod 9. When it moves to the upper end and fits and seals with the mesh cover 7, it is used for adsorption and purification. Through the mesh cover 7, the adsorbent is distributed in a conical shape, and the cross-sectional area gradually increases during adsorption, which can effectively improve the adsorption effect of the diffused upward gas.

[0027] When the conical cover 8 moves to the lower end and fits and seals with the bottom of the tank body, it is used for pressure relief and desorption. A conical channel is formed between the mesh cover 7 and the conical cover 8. The impurity gas can pass through the conical side wall of the mesh cover 7 and be discharged into the conical channel. The conical side wall of the mesh cover 7 increases the discharge area, shortens the discharge distance of the impurities inside the adsorbent, reduces the resistance and improves the discharge speed of the impurity gas.

[0028] In a possible implementation manner, the telescopic rod 9 is a cylinder, a hydraulic cylinder or an electric push rod.

[0029] Using a cylinder, a hydraulic cylinder or an electric push rod as the telescopic rod 9 to move the conical cover 8 up and down is convenient and easy to control.

[0030] In a possible implementation manner, vertical pipes 12 are respectively fixed at the upper ends inside the first adsorption tank 1 and the second adsorption tank 2, and the tops are respectively communicated with the vertical pipes 12 through two backflush pipes 6. A gas distribution plate 13 is installed at the lower end of the vertical pipe 12.

[0031] The vertical pipe 12 can be sleeved in the vertical section of the exhaust pipe 5 with a gap, or can be separately arranged at the tops of the first adsorption tank 1 and the second adsorption tank 2. One end of the backflush pipe 6 is communicated with the vertical pipe 12, and the other end is communicated with the exhaust pipe 5. The two backflush pipes 6 cross and are communicated with the exhaust pipe 5 at the tops of the first adsorption tank 1 and the second adsorption tank 2 and the internal vertical pipe 12. During backflushing, a part of the hydrogen gas entering the exhaust pipe 5 is guided through the backflush pipe 6 and discharged from the gas distribution plate 13 along the vertical pipe 12 to backflush the impurity gas desorbed inside the adsorbent.

[0032] In a possible implementation manner, the gas distribution plate 13 is composed of a plurality of bent pipes that can spray spirally.

[0033] The gas distribution plate 13 composed of bent pipes that can spray spirally can make the hydrogen gas entering the tank body during backflushing form a swirl, which is beneficial to entrain and discharge the impurity gas.

[0034] In a possible implementation manner, the mouth part at the lower end of the conical cover 8 can be sealed with the side wall of the air inlet plate 10 and the bottoms inside the first adsorption tank 1 and the second adsorption tank 2.

[0035] The mouth part of the conical cover 8 can be sealed with the air inlet plate 10 and the bottom of the tank body respectively, which can further avoid leakage during the gas flow process.

[0036] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A regeneration system for an adsorbent used in hydrogen purification, comprising an adsorption tank one (1) and an adsorption tank two (2), the bottoms of which are respectively communicated with an intake pipe (4), and the tops of which are respectively communicated with an exhaust pipe (5). A backwash pipe (6) is communicated between the tops of the adsorption tank one (1) and the adsorption tank two (2). It is characterized in that: Inside the first adsorption tank (1) and the second adsorption tank (2), an inverted conical mesh cover (7) is respectively fixed. The bottom is connected to a venting device (3) through a vent pipe (11). The lower end of the mesh cover (7) is connected to an intake pipe (4) through an intake air disc (10). A conical cover (8) that fits closely with it is sleeved on the outer conical surface below the mesh cover (7). The conical cover (8) can be vertically lifted and lowered through a telescopic rod (9) and is sleeved on the pipe orifice of the bottom vent pipe (11). Two independently opened and closed valves are installed on each of the intake pipe (4), the exhaust pipe (5), and the vent pipe (11).

2. The regeneration system of the adsorbent for hydrogen purification according to claim 1, characterized in that: The telescopic rod (9) is a pneumatic cylinder, a hydraulic cylinder, or an electric push rod.

3. The regeneration system of the adsorbent for hydrogen purification according to claim 1, characterized in that: Vertical pipes (12) are respectively fixed at the upper ends inside the first adsorption tank (1) and the second adsorption tank (2). The tops are respectively connected to the vertical pipes (12) through two backwashing pipes (6). A gas distribution disc (13) is installed at the lower end of the vertical pipe (12).

4. The regeneration system for the adsorbent used in hydrogen purification according to claim 3, wherein: The gas distribution disc (13) is composed of a plurality of bent pipes capable of spraying out in a spiral manner.

5. The regeneration system of the adsorbent for hydrogen purification according to any one of claims 1-4, characterized in that: The mouth part at the lower end of the conical cover (8) can be sealed with the side wall of the intake air disc (10) and the bottoms inside the first adsorption tank (1) and the second adsorption tank (2).

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