Zero-escape cold set composite tritium enrichment system and method

Abstract

The application discloses a zero-escape cold set composite tritium enrichment system and method, which comprises a molecular sieve body and an air inlet pipe connected with the molecular sieve body; the molecular sieve body is further connected with a cold trap for condensing and collecting tritiated water in air; a circulating conveying pipeline is connected between the cold trap and the molecular sieve body, and a circulating pump for improving the recovery rate by circulating conveying air is installed on the circulating conveying pipeline; the cold trap comprises an outer shell, a cold plate installed in the outer shell, and coarse and fine zigzag mechanisms installed on both sides of the cold plate to improve the air contact area and multi-stage adsorption.

Description

Technical Field

[0001] This invention relates to the field of molecular sieve desorption technology, specifically to a zero-escape cold collection composite tritium enrichment system and method. Background Technology

[0002] Currently, tritium sampling in low-humidity areas is a challenge. Using molecular sieves is one method to improve water vapor capture efficiency in low-humidity air. However, the desorption efficiency after molecular sieve sampling is a key parameter affecting sample recovery. In existing technologies, when using molecular sieves to desorb air, air enters the sieve, where it undergoes thermal desorption. The desorbed air then sequentially enters a condenser and a freezer to collect the tritium. The air is then directly discharged, but a small amount of tritium remains, reducing the recovery rate of the molecular sieve desorption. Therefore, a zero-escape cold collection composite tritium enrichment system and method are proposed. Summary of the Invention

[0003] The purpose of this invention is to solve the above problems by proposing a zero-escape cold collection composite tritium enrichment system and method.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a zero-escape cold collection composite tritium enrichment system, comprising a molecular sieve body and an air inlet pipe connected to the molecular sieve body; characterized in that the molecular sieve body is also connected to a cold trap for condensing and collecting tritium water in the air; a circulation conveying pipe is connected between the cold trap and the molecular sieve body, and a circulation pump installed on the circulation conveying pipe to circulate and convey air to improve the recovery rate; the cold trap includes a shell, a cold plate installed inside the shell, and a coarse serrated mechanism and a fine serrated mechanism respectively installed on both sides of the cold plate to increase the air contact area for multi-stage adsorption.

[0005] Preferably, both the coarse serrated mechanism and the fine serrated mechanism include a fixed serrated block fixedly mounted on the cold plate, a movable serrated block that meshes with the fixed serrated block and is movably mounted inside the housing, and a drive source that drives the movable serrated block to move.

[0006] Preferably, the movable sawtooth block is also equipped with a guide frame that is connected to the drive source and guides the movement of the movable sawtooth block.

[0007] Preferably, the outer shell is also equipped with a heat insulation layer and an internal gas channel.

[0008] Preferably, the outer casing is also provided with an air inlet, an air outlet communicating with the internal gas channel, and a collection channel.

[0009] Preferably, the system also includes an inert gas tank for activating the molecular sieve body after desorption, connected to the circulation conveying pipeline, an venting pipeline for venting the activated gas, and a three-way valve connecting the venting pipeline and the circulation conveying pipeline.

[0010] Preferably, a venting pipe and a shut-off valve installed on the venting pipe are connected between the inert gas tank and the circulating delivery pipe.

[0011] Preferably, a dew point meter is also included, which is connected to the circulating delivery pipe to sense the dew point temperature in the air.

[0012] A method for a zero-escape cold-collection composite tritium enrichment system, characterized by the following desorption method: The molecular sieve body is heated to desorb air. The air carries the water vapor desorbed from the molecular sieve into the cold trap. The cold trap condenses and collects the water / tritium water in the carrier gas and discharges the air. The discharged air is then pumped back into the molecular sieve body through a circulation pipeline as the carrier gas for secondary desorption. The air is circulated and desorbed multiple times in the above manner until the desorption time is reached, at which point desorption stops. This achieves zero escape collection of tritium water during the desorption process, thereby improving the desorption recovery rate of the molecular sieve. After desorption is completed, the inert gas in the inert gas tank is transported to the molecular sieve body by a circulation pump to activate the molecular sieve and then vent it.

[0013] The beneficial effects of this invention are as follows: by using a circulating pump to transport the air discharged from the cold trap back to the molecular sieve body through a circulating pipeline for desorption, and performing multiple cycles, the tritium water in the air is collected with zero escape, thereby improving the high recovery rate of desorption of the molecular sieve body. By having the coarse and fine serrated mechanisms on both sides of the cold plate come into contact with the air in sequence, the tritium water in the air is condensed and collected, thereby increasing the air contact area and achieving zero escape collection of tritium water from the air, thus improving the collection efficiency. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present invention.

[0015] Figure 2 This is a cross-sectional view of the cold trap of the present invention.

[0016] Figure 3 This is a schematic diagram of the structure of one embodiment of the present invention.

[0017] Legend: 1. Molecular sieve body; 2. Inlet pipe; 3. Cold trap; 301. Outer shell; 302. Cold plate; 303. Coarse serrated mechanism; 304. Fine serrated mechanism; 305. Fixed serrated block; 306. Movable serrated block; 307. Drive source; 308. Guide frame; 309. Internal gas channel; 310. Inlet; 311. Outlet; 312. Collection channel; 313. Insulation layer; 4. Circulation pipeline; 5. Circulation pump; 6. Inert gas tank; 601. Exhaust pipeline; 602. Three-way valve; 603. Ventilation pipeline; 604. Shut-off valve; 7. Dew point meter. Detailed Implementation

[0018] Below we combine Figures 1-3 The present invention provides a further description of a zero-escape cold collection composite tritium enrichment system and method.

[0019] It should be noted that all directional indications in the embodiments of the present invention, such as up, down, left, right, front, back, etc., are only used to explain the relative positional relationship and movement of the components in a specific posture as shown in the attached figure. If the specific posture changes, the directional indication will also change accordingly.

[0020] See Figures 1-2 As shown, this embodiment of a zero-escape cold collection composite tritium enrichment system includes a molecular sieve body 1 and an air inlet pipe 2 connected to the molecular sieve body 1. The molecular sieve body 1 is further connected to a cold trap 3 for condensing and collecting water or tritium water in the air. A circulation conveying pipe 4 and a circulation pump 5 installed on the circulation conveying pipe 4 are connected between the cold trap 3 and the molecular sieve body 1 to circulate and transport air, thereby improving the recovery rate. The cold trap 3 includes a shell 301, a cold plate 302 installed inside the shell 301, and a coarse serrated mechanism 303 and a fine serrated mechanism 304 respectively installed on both sides of the cold plate 302 to increase the air contact area for multi-stage adsorption. By using the circulation pump 5 to transport the air discharged from the cold trap 3 back to the molecular sieve body 1 through the circulation conveying pipe 4 for desorption, multiple cycles are performed to achieve zero-escape collection of tritium water in the air, thereby improving the high recovery rate of the desorption of the molecular sieve body 1. The coarse serrated mechanism 303 and the fine serrated mechanism 304 on both sides of the cold plate 302 come into contact with the air in sequence, condensing and collecting water or tritium water in the air, thereby increasing the air contact area, achieving zero escape collection of tritium water in the air, and thus improving the collection efficiency.

[0021] See Figure 2As shown, both the coarse serrated mechanism 303 and the fine serrated mechanism 304 include a fixed serrated block 305 fixedly mounted on the cold plate 302, a movable serrated block 306 that meshes with the fixed serrated block 305 and is movably mounted inside the housing 301, and a drive source 307 that drives the movable serrated block 306 to move. The movable serrated block 306 is also equipped with a guide frame 308 connected to the drive source 307 to guide the movement of the movable serrated block 306. The movable sawtooth block 306 is driven to engage with the fixed sawtooth block 305, squeezing the condensed frost on the surfaces of the movable and fixed sawtooth blocks 306 and collecting it in the collection channel 312. This prevents blockage at the movable and fixed sawtooth blocks 306 and 305. At the same time, the air passes through the coarse sawtooth mechanism 303 and the fine sawtooth mechanism 304 in sequence, increasing the air contact area for multi-stage adsorption and thus improving the adsorption effect.

[0022] See Figure 2 As shown, the outer shell 301 is also equipped with a heat insulation layer 313 and an internal gas channel 309; the outer shell 301 is also equipped with an air inlet 310, an air outlet 311 communicating with the internal gas channel 309, and a collection channel 312; the gas passes through the coarse serrated mechanism 303 and the fine serrated mechanism 304 through the internal gas channel 309 and is discharged from the air outlet 311, thereby facilitating the discharge of the adsorbed gas.

[0023] See Figure 1 As shown, it also includes an inert gas tank 6 connected to the circulation conveying pipeline 4 for activating the desorbed molecular sieve body 1, an venting pipeline 601 for venting the activated gas, and a three-way valve 602 connecting the venting pipeline 601 and the circulation conveying pipeline 4; a ventilation pipeline 603 and a shut-off valve 604 installed on the ventilation pipeline 603 are connected between the inert gas tank 6 and the circulation conveying pipeline 4; by opening the shut-off valve 604, the inert gas in the inert gas tank 6 is transported by the circulation pump 5 through the ventilation pipeline 603 and the circulation conveying pipeline 4 to the molecular sieve body 1 to activate the desorbed molecular sieve, and then the inert gas is discharged from the venting pipeline 601 through the three-way valve 602, thereby facilitating the activation of the desorbed molecular sieve.

[0024] In the process of using this invention, the circulation pump 5 is turned on to heat and desorb the molecular sieve body 1. Air carrying the desorbed water vapor from the molecular sieve enters the water trap through the air inlet 310. The air first passes through the fixed sawtooth block 305 and the movable sawtooth block 306 of the coarse sawtooth mechanism 303. The cold plate 302 cools the fixed sawtooth block 305 of the coarse sawtooth mechanism 303 and the fixed sawtooth block 305 of the fine sawtooth mechanism 304. The moisture in the air encounters the fixed sawtooth block 305 and the movable sawtooth block 306 of the coarse sawtooth mechanism 303 and forms frost on the outer surface of the fixed sawtooth block 305 and the movable sawtooth block 306. After passing through the fixed sawtooth block 305 and the movable sawtooth block 306 of the coarse sawtooth mechanism 303, frost forms on the outer surface of the fixed sawtooth block 305 and the movable sawtooth block 306. 6. After adsorption, the air enters the fixed sawtooth block 305 and movable sawtooth block 306 of the fine sawtooth mechanism 304. The fixed sawtooth block 305 and movable sawtooth block 306 of the fine sawtooth mechanism 304 continue to adsorb the residual moisture in the air. After being adsorbed again by the fixed sawtooth block 305 and movable sawtooth block 306 of the fine sawtooth mechanism 304, the air is discharged from the outlet 311 through the internal gas channel 309. The drive source 307 drives the guide frame 308 to push the movable sawtooth block 306 to mesh with the fixed sawtooth block 305, squeezing the water condensed on the fixed sawtooth block 305 and movable sawtooth block 306 to fall down and be collected uniformly through the collection channel 312. The circulating pump 5 transports the air discharged from the outlet 311 back to the molecular sieve body 1 through the circulating conveying pipe 4 as the carrier gas for secondary desorption. The air is circulated, desorbed, and condensed multiple times in the above manner until the set time point is reached and then desorption is stopped. Then, the shut-off valve 604 on the ventilation pipe 603 is opened and the inert gas in the inert gas tank 6 is transported to the molecular sieve body 1 by the circulating pump 5 for activation treatment. Then, the inert gas is discharged through the vent pipe 601 through the circulating conveying pipe 4 and the three-way valve 602.

[0025] In one embodiment, see Appendix Figure 3 As shown, it also includes a dew point meter 7 connected to the circulating conveying pipe 4 to sense the dew point temperature in the air; by sensing the dew point temperature in the air in real time through the dew point meter 7, desorption can be stopped when the dew point temperature in the air is the same as the temperature in the cold trap 3, thereby realizing automatic sensing.

[0026] The above embodiments are illustrative of the present invention and are not intended to limit the present invention. Any simple modifications to the present invention are within the scope of protection of the present invention.

Claims

1. A zero-escape cold collection composite tritium enrichment system, comprising a molecular sieve body (1) and an inlet pipe (2) connected to the molecular sieve body (1); characterized in that... The molecular sieve body (1) is also connected to a cold trap (3) for condensing and collecting tritium water in the air; a circulation conveying pipe (4) is connected between the cold trap (3) and the molecular sieve body (1), and a circulation pump (5) installed on the circulation conveying pipe (4) to circulate and convey air to improve the recovery rate; the cold trap (3) includes a shell (301), a cold plate (302) installed in the shell (301), and a coarse sawtooth mechanism (303) and a fine sawtooth mechanism (304) respectively installed on both sides of the cold plate (302) to improve the air contact area and perform multi-stage adsorption; the coarse sawtooth mechanism (303) and the fine sawtooth mechanism (304) each include a fixed sawtooth block (305) fixedly installed on the cold plate (302), a movable sawtooth block (306) that meshes with the fixed sawtooth block (305) and can be movably installed in the shell (301), and a driving source (307) that drives the movable sawtooth block (306) to move.

2. A zero escape cold set composite tritium enrichment system according to claim 1, characterized in that: The movable sawtooth block (306) is also equipped with a guide frame (308) that is connected to the drive source (307) and guides the movement of the movable sawtooth block (306).

3. A zero escape cold set composite tritium enrichment system according to claim 1, characterized in that: The outer shell (301) is also equipped with a heat insulation layer (313) and an internal gas channel (309).

4. The zero-escape cold collection composite tritium enrichment system according to claim 3, characterized in that: The outer casing (301) is also provided with an air inlet (310), an air outlet (311) communicating with the internal gas channel (309), and a collection channel (312).

5. The zero-escape cold collection composite tritium enrichment system according to claim 1, characterized in that: It also includes an inert gas tank (6) connected to the circulation conveying pipe (4) to activate the molecular sieve body (1) after desorption, an emptying pipe (601) to empty the activated gas, and a three-way valve (602) connecting the emptying pipe (601) and the circulation conveying pipe (4).

6. The zero-escape cold collection composite tritium enrichment system according to claim 5, characterized in that: A venting pipe (603) and a shut-off valve (604) are connected between the inert gas tank (6) and the circulating conveying pipe (4).

7. The zero-escape cold collection composite tritium enrichment system according to claim 1, characterized in that: It also includes a dew point meter (7) connected to the circulating delivery pipe (4) to sense the dew point temperature in the air.

8. The method of claim 1-7, wherein: The desorption method is as follows: The molecular sieve body is heated to desorb air. The air carries the water vapor desorbed from the molecular sieve into the cold trap. The cold trap condenses and collects the water / tritium water in the carrier gas and discharges the air. The discharged air is then pumped back into the molecular sieve body through a circulation pipeline as the carrier gas for secondary desorption. The air is circulated and desorbed multiple times in the above manner until the desorption time is reached, at which point desorption stops. This achieves zero escape collection of tritium water during the desorption process, thereby improving the desorption recovery rate of the molecular sieve. After desorption is completed, the inert gas in the inert gas tank is transported to the molecular sieve body by a circulation pump to activate the molecular sieve and then vent it.

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