Tritium and carbon sampling system

Abstract

The utility model relates to a tritium and carbon sampling system. The tritium and carbon sampling system comprises a gas inlet unit, an absorption unit and a gas extraction unit which are sequentially communicated, wherein the gas inlet unit comprises a coarse filter and at least one fine filter which are sequentially communicated through a gas pipeline, and in the gas inlet direction, the inlet side of the first fine filter in the at least one fine filter is connected with a first pressure sensor, and the outlet side of the last fine filter in the at least one fine filter is connected with a second pressure sensor. According to the tritium carbon sampling system, whether the fine filter is blocked or not can be judged by calculating the reading difference value between the first pressure sensor and the second pressure sensor, so that a worker can be reminded to replace the fine filter in time when the fine filter is blocked, smooth air intake of the tritium carbon sampling system is ensured, and the accuracy of a sampling result of the tritium carbon sampling system is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of nuclear reactor radioactive material monitoring, and in particular to a tritium carbon sampling system. Background Art

[0002] Tritium and carbon-14 are two radioactive nuclides that are highly concerned when released into the environment by nuclear equipment. Among them, tritium has a strong isotope exchange capacity and a half-life of 12.6 years. Most of the tritium released into the environment will eventually form tritium water-water vapor and enter the water cycle together with ordinary water, so it is easy for humans to be radiated. Carbon-14 participates in the global carbon cycle and causes global warming. Therefore, in nuclear reaction work, it is of great significance to monitor the content of tritium and carbon in the exhaust gas. Before monitoring the content of tritium and carbon in the gas, it is usually necessary to sample the tritium and carbon-14 in the gas through a tritium-carbon sampling system. Among them, whether the air intake of the tritium-carbon sampling system is normal has an important impact on the accuracy of subsequent detection. Therefore, ensuring that the tritium-carbon sampling device can normally intake air during use is an important factor affecting the test results. In the related art, the tritium carbon sampling system is not accurate enough in monitoring the air intake, which may lead to inaccurate sampling information of the tritium carbon sampling system. In severe cases, it may cause the heating module of the tritium carbon sampling system to dry burn. Summary of the invention

[0003] Based on this, it is necessary to provide a tritium carbon sampling system to solve the problem of how to monitor the intake condition more accurately.

[0004] A tritium carbon sampling system comprises an air intake unit, an absorption unit and an air extraction unit which are connected in sequence; wherein the air intake unit comprises a coarse filter and at least one fine filter which are connected in sequence, and along the air intake direction, the inlet side of the first fine filter of the at least one fine filter is connected to a first pressure sensor, and the outlet side of the last fine filter is connected to a second pressure sensor.

[0005] The technical solution is further described below:

[0006] In one of the embodiments, a flow sensor is also provided on the gas pipeline of the air intake unit.

[0007] In one embodiment, the absorption unit includes a front-end absorption bottle, a catalytic oxidation module and a rear-end absorption bottle which are connected in sequence, the front-end absorption bottle is connected to the air intake unit, and the rear-end absorption bottle is connected to the air extraction unit.

[0008] In one embodiment, the catalytic oxidation module comprises:

[0009] A catalytic reactor, the catalytic reactor is connected between the front-stage absorption bottle and the rear-stage absorption bottle, and the catalytic reactor comprises a heating element for heating the gas and a first temperature sensor for detecting the heating temperature of the heating element;

[0010] a second temperature sensor, the second temperature sensor being disposed at an outlet side of the catalytic reactor and being used to detect a gas temperature at an outlet of the catalytic reactor;

[0011] A first radiator, which is disposed between the second temperature sensor and the rear-stage absorption bottle and is used to cool the gas;

[0012] A third temperature sensor is disposed at the outlet side of the first radiator, and is used to detect the gas temperature at the outlet of the first radiator.

[0013] In one of the embodiments, the tritium carbon sampling system further includes a cooling unit, wherein the cooling unit is connected to both the front-end absorption bottle and the rear-end absorption bottle, and the cooling unit is used to cool the front-end absorption bottle and the rear-end absorption bottle.

[0014] In one of the embodiments, the cooling unit is also connected between the third temperature sensor and the rear-stage absorption bottle, and the cooling unit is used to cool the gas entering the rear-stage absorption bottle.

[0015] In one embodiment, the cooling unit includes a liquid storage tank, a circulation pump and a refrigerator. The liquid storage tank, the circulation pump and the refrigerator are connected through a cooling pipeline to form a cooling circuit. The cooling pipeline passes through the front absorption bottle and the rear absorption bottle.

[0016] In one embodiment, a fourth temperature sensor is provided on the outlet side of the refrigerator, and the fourth temperature sensor is used to detect the coolant temperature at the outlet of the refrigerator; and / or, a third pressure sensor is also provided on the cooling pipeline, and the third pressure sensor is used to detect the pressure of the coolant in the cooling pipeline.

[0017] In one embodiment, the cooling unit further includes a second radiator, which is connected to the hot end of the refrigerator to cool the hot end of the refrigerator; and / or a liquid level switch is provided in the liquid storage tank, and the liquid level switch is used to monitor the liquid level height in the liquid storage tank.

[0018] In one of the embodiments, the air extraction unit includes an air extraction pump connected to the absorption unit and a fourth pressure sensor connected between the absorption unit and the air extraction pump.

[0019] In the above tritium carbon sampling system, the air extraction unit is used to provide negative pressure for the system so that the gas enters the system from the air intake unit. The air intake unit filters the gas entering the system multiple times through a coarse filter and at least one fine filter to remove impurities in the gas, and then the filtered gas enters the absorption unit to absorb the tritium and carbon in the gas. Since the inlet side of the first fine filter in the at least one fine filter is connected to the first pressure sensor, and the outlet side of the last fine filter is connected to the second pressure sensor. Therefore, by calculating the reading difference between the first pressure sensor and the second pressure sensor, the resistance loss of the gas pipeline between the first pressure sensor and the second pressure sensor can be obtained. When the resistance loss exceeds the predetermined threshold, it can be determined that the fine filter is clogged, and the staff can be reminded to replace the fine filter in time to ensure smooth air intake of the tritium carbon sampling system, thereby ensuring the accuracy of the sampling results of the tritium carbon sampling system. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application.

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0022] In addition, the drawings are not drawn to a 1:1 scale, and the relative sizes of the various elements are drawn only as examples in the drawings and are not necessarily drawn according to the true scale.

[0023] Figure 1 Schematic diagram of the structure of a tritium carbon sampling system according to an embodiment.

[0024] Figure 2 Schematic diagram of the structure of an air intake unit according to an embodiment.

[0025] Figure 3 It is a schematic structural diagram of an absorption unit according to an embodiment.

[0026] Figure 4 It is a schematic structural diagram of a cooling unit according to an embodiment.

[0027] Figure 5 Schematic diagram of the structure of an air extraction unit according to an embodiment.

[0028] Description of reference numerals:

[0029] 10. Intake unit; 11. Coarse filter; 12. First pressure sensor; 13. Fine filter; 14. Second pressure sensor; 15. Flow sensor; 20. Absorption unit; 21. Front absorption bottle; 22. Rear absorption bottle; 23. Catalytic reactor; 231. Heating element; 232. First temperature sensor; 24. Second temperature sensor; 25. First radiator; 26. Third temperature sensor; 30. Cooling unit; 31. Liquid storage tank; 32. Circulation pump; 33. Refrigerator; 34. Fourth temperature sensor; 35. Third pressure sensor; 36. Liquid level switch; 40. Air extraction unit; 41. Fourth pressure sensor; 42. Air extraction pump. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0031] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0032] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0033] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0034] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0036] As described in the background technology, whether the air intake of the tritium carbon sampling system is normal has an important impact on the accuracy of subsequent detection. Therefore, ensuring that the tritium carbon sampling device can take in air normally during use is an important factor affecting the detection results. Generally, traditional tritium carbon sampling systems need to set filters at the air intake position to filter the gas entering the system. However, the current tritium carbon sampling system does not monitor the filter. When the filter is blocked after being used for a period of time, it may cause a decrease in the air intake, resulting in inaccurate sampling information of the tritium carbon sampling system. In severe cases, it may also cause the heating module of the tritium carbon sampling system to dry burn.

[0037] Based on this, an embodiment of the present application provides a tritium carbon sampling system, see Figure 1A tritium-carbon sampling system of one embodiment includes an air intake unit 10, an absorption unit 20 and an exhaust unit 40 which are connected in sequence, wherein the exhaust unit 40 is used to provide negative pressure for the system so that the gas enters the system from the air intake unit 10, the air intake unit 10 is used to filter the gas to remove impurities in the gas, and the absorption unit 20 is used to process the filtered gas to absorb tritium and carbon in the gas.

[0038] Specifically, see Figure 2 The air intake unit 10 includes a coarse filter 11 and at least one fine filter 13 which are sequentially connected through a gas pipeline. In one embodiment, the coarse filter 11 is used to perform coarse filtering on the gas to remove particulate impurities larger than 100 μm in the gas, and the fine filter 13 is used to perform fine filtering on the gas to remove particulate impurities larger than 2 μm and liquid in the gas. Furthermore, along the air intake direction, the inlet side of the first fine filter 13 in at least one fine filter 13 is connected to a first pressure sensor 12, and the outlet side of the last fine filter 13 is connected to a second pressure sensor 14. The first pressure sensor 12 is used to detect the gas pressure on the inlet side of the first fine filter 13, and the second pressure sensor 14 is used to detect the gas pressure on the outlet side of the last fine filter 13.

[0039] In the above tritium carbon sampling system, the air extraction unit 40 is used to provide negative pressure for the system so that the gas enters the system from the air intake unit 10. The air intake unit 10 filters the gas entering the system multiple times through the coarse filter 11 and at least one fine filter 13 to remove impurities in the gas, and then the filtered gas enters the absorption unit 20 to absorb tritium and carbon in the gas. Since the inlet side of the first fine filter 13 in the at least one fine filter 13 is connected to the first pressure sensor 12, and the outlet side of the last fine filter 13 is connected to the second pressure sensor 14. Therefore, by calculating the reading difference between the first pressure sensor 12 and the second pressure sensor, the resistance loss of the gas pipeline between the first pressure sensor 12 and the second pressure sensor can be obtained. When the resistance loss exceeds the predetermined threshold, it can be determined that the fine filter 13 is blocked, and then the staff can be reminded to replace the fine filter 13 in time, so as to ensure the smooth air intake of the tritium carbon sampling system, and then ensure the accuracy of the sampling results of the tritium carbon sampling system.

[0040] See also Figure 2In one embodiment, the number of fine filters 13 is multiple. For example, in this embodiment, the number of fine filters 13 is two, and the two fine filters 13 are connected in sequence, thereby improving the filtering effect. The first pressure sensor 12 is arranged at the inlet side of the first fine filter 13 to detect the pressure of the gas before entering each fine filter 13, and the second pressure sensor 14 is arranged at the outlet side of the second fine filter 13 to detect the pressure of the gas after passing through all fine filters 13. In this way, when the first fine filter 13 and / or the second fine filter 13 is blocked or damaged, the reading difference between the first pressure sensor 12 and the second pressure sensor 14 will increase, thereby reminding the staff to replace the fine filter 13 in time.

[0041] Furthermore, in one embodiment, the tritium carbon sampling system further includes an intake alarm module (not shown). When the reading difference between the first pressure sensor 12 and the second pressure sensor 14 exceeds a preset threshold, the intake alarm module issues a first alarm message to remind the fine filter 13 to be replaced.

[0042] See also Figure 2 A flow sensor 15 is also provided on the gas pipeline of the air intake unit 10. The flow sensor 15 is used to detect the mass flow of the gas. In one embodiment, the flow sensor 15 is provided between the two fine filters 13. The air intake condition of the air intake unit 10 is monitored by the flow sensor 15, the first pressure sensor 12 and the second pressure sensor 14, so as to avoid the failure to timely discover the fault caused by inaccurate detection of one of the sensors, thereby ensuring the normal monitoring and absorption of tritium and carbon in the gas.

[0043] See also Figure 3 In one embodiment, the absorption unit 20 includes a front-end absorption bottle 21, a catalytic oxidation module and a rear-end absorption bottle 22 connected in sequence, the front-end absorption bottle 21 is connected to the air intake unit 10, and the rear-end absorption bottle 22 is connected to the gas extraction unit 40. Specifically, during operation, the air intake unit 10 first passes the filtered gas into the front-end absorption bottle 21, the front-end absorption bottle 21 directly absorbs the tritium water and carbon dioxide in the gas, and then the gas enters the catalytic oxidation module, the catalytic oxidation module decomposes the tritium and carbon compounds in the gas that cannot be directly absorbed by the front-end absorption bottle 21 into tritium water and carbon dioxide, and then passes them into the rear-end absorption bottle 22, the rear-end absorption bottle 22 absorbs the tritium water and carbon dioxide in the gas after catalytic oxidation by the catalytic oxidation module, so as to complete the sampling. Preferably, in one embodiment, the number of the front-end absorption bottles 21 and the number of the rear-end absorption bottles 22 are both multiple, for example, in one embodiment, the number of the front-end absorption bottles 21 is two, and the two front-end absorption bottles 21 are connected in sequence. The number of the rear-stage absorption bottles 22 is also two, and the two rear-stage absorption bottles 22 are connected in sequence, thereby ensuring that tritium and carbon in the gas can be fully absorbed.

[0044] See also Figure 3 In one embodiment, the catalytic oxidation module includes a catalytic reactor 23, a second temperature sensor 24, a first radiator 25 and a third temperature sensor 26. The catalytic reactor 23 is connected between the front-end absorption bottle 21 and the rear-end absorption bottle 22. The catalytic reactor 23 includes a heating element 231 for heating the gas and a first temperature sensor 232 for detecting the heating temperature of the heating element 231. The second temperature sensor 24 is arranged at the outlet side of the catalytic reactor 23 to detect the gas temperature at the outlet of the catalytic reactor 23. The first radiator 25 is arranged between the second temperature sensor 24 and the rear-end absorption bottle 22 to cool the gas. The third temperature sensor 26 is arranged at the outlet side of the first radiator 25, and the third temperature sensor 26 is used to detect the gas temperature at the outlet of the first radiator 25.

[0045] Specifically, the catalytic reactor 23 heats and catalyzes the gas through the catalyst and the heating element 231 therein, so as to decompose the tritium and carbon compounds in the gas that cannot be directly absorbed by the front-end absorption bottle 21 into tritium water and carbon dioxide. Furthermore, the heating temperature of catalytic oxidation is the key to the catalytic efficiency of the catalyst. If the heating temperature cannot be effectively controlled, it is easy to cause insufficient catalytic oxidation of the gas, thereby failing to completely decompose the tritium and carbon compounds in the gas that cannot be absorbed, and thus causing inaccurate detection results.

[0046] The present application detects the gas temperature at the outlet of the catalytic reactor 23 by the second temperature sensor 24 to monitor the gas temperature in the catalytic reactor 23, thereby controlling the output power of the electric heating element 231, and then controlling the heating temperature of the heating element 231, so as to achieve the gas temperature at the outlet of the catalytic reactor 23 being maintained at a set value, such as 550°C. Specifically, when the temperature value detected by the second temperature sensor 24 is lower than the set value, the output power of the heating element 231 can be increased by the control system to increase the heating temperature, and when the temperature value detected by the second temperature sensor 24 is higher than the set value, the output power of the heating element 231 can be reduced by the control system to reduce the heating temperature. In this way, the heating temperature is precisely controlled. Specifically, in one embodiment, the control system is controlled by the control circuit to adjust the empty ratio of the heating element 231 to achieve the adjustment of the heating temperature. Preferably, the heating element 231 can be an electric heating wire.

[0047] Furthermore, the temperature of the gas after being heated and catalyzed by the catalytic reactor 23 is relatively high. If the gas is directly passed into the rear-stage absorption bottle 22, the absorption effect will be affected. By arranging the first radiator 25 between the second temperature sensor 24 and the rear-stage absorption bottle 22, the first radiator 25 can effectively cool the gas after heating and catalysis to ensure the absorption effect of the rear-stage absorption bottle 22. At the same time, by arranging the third temperature sensor 26 at the outlet of the first radiator 25 to detect the gas temperature at the outlet of the first radiator 25, when the temperature is high, the first radiator 25 can be controlled by the control system to increase the heat dissipation power of the first radiator 25 to ensure that the gas entering the rear-stage absorption bottle 22 is within the set temperature range. Preferably, the first radiator 25 can be a fan radiator.

[0048] Furthermore, the catalytic oxidation module is provided with a temperature alarm module, which issues an alarm message when the temperature of the gas entering the rear absorption bottle 22 is higher than a set value. When the detected temperature is lower than the set value, the first radiator 25 stops working.

[0049] Furthermore, in one embodiment, the heating temperature of the catalytic oxidation reactor can also be controlled by a control system. Specifically, when the amount of exhaust gas absorbed by the air intake unit 10 per unit time increases or the flow rate of the exhaust gas in the catalytic reactor 23 increases, the heating temperature of the catalytic reactor 23 can be increased by the control system to ensure that the tritium-containing and carbon-14-containing substances in the exhaust gas can be thoroughly catalytically oxidized, thereby improving the processing capacity of the tritium carbon sampling system and avoiding problems such as inaccurate detection.

[0050] See also Figure 1 The tritium carbon sampling system also includes a cooling unit 30, which is connected to the front absorption bottle 21 and the rear absorption bottle 22. The cooling unit 30 is used to cool the front absorption bottle 21 and the rear absorption bottle 22. Specifically, the front absorption bottle 21 and the rear absorption bottle 22 are both filled with absorption liquid. Generally, the absorption effect is best when the temperature of the absorption liquid is 10°C-15°C. By cooling the cooling liquid in the front absorption bottle 21 and the rear absorption bottle 22 by the cooling unit 30, the absorption effect can be effectively guaranteed.

[0051] Furthermore, the cooling unit 30 is also connected between the third temperature sensor 26 and the rear-stage absorption bottle 22, and the cooling unit 30 is used to cool the gas entering the rear-stage absorption bottle 22. In this way, the gas after catalytic oxidation first dissipates heat through the first radiator 25, and then cools through the cooling unit 30, which can ensure that the gas entering the rear-stage absorption bottle 22 is cooled to room temperature.

[0052] Specifically, see Figure 4In one embodiment, the cooling unit 30 includes a liquid storage tank 31, a circulation pump 32 and a refrigerator 33. The liquid storage tank 31, the circulation pump 32 and the refrigerator 33 are connected through a cooling pipeline to form a cooling circuit. The cooling pipeline passes through the front absorption bottle 21 and the rear absorption bottle 22. In this way, when working, the circulation pump 32 pumps the coolant from the liquid outlet of the liquid storage tank 31 to the cooling pipeline, and then the coolant passes through the cold end of the refrigerator 33 along the cooling pipeline. The cold end of the refrigerator 33 releases cold energy to exchange heat with the coolant to reduce the temperature of the coolant. Then the coolant continues to flow through the interior of the front absorption bottle 21 and the rear absorption bottle 22 along the cooling pipeline, so that the cooled coolant exchanges heat with the absorption liquid in the interior of the front absorption bottle 21 and the rear absorption bottle 22 to cool the absorption liquid. Finally, the coolant flows back to the liquid storage tank 31 along the cooling pipeline, and the cycle is circulated to achieve continuous cooling of the absorption liquid. Preferably, the cooler 33 may be a TEC (Thermo Electric Cooler, semiconductor cooler 33)

[0053] Furthermore, the cooling unit 30 may also include an ambient temperature sensor (not shown), which is used to detect the ambient temperature. When the detected ambient temperature is higher than 15°C, the ambient temperature sensor transmits the temperature information to the control system, and the control system issues a cooling instruction to the cooling unit 30, and the cooling unit starts working.

[0054] Optionally, in one embodiment, a fourth temperature sensor 34 is provided at the outlet side of the refrigerator 33, and the fourth temperature sensor 34 is used to detect the temperature of the coolant at the outlet of the refrigerator 33, so that the cooling capacity of the refrigerator 33 can be controlled according to the temperature of the coolant. Specifically, when the fourth temperature sensor 34 detects that the temperature of the cooling medium is at a temperature of 5°C-10°C, the refrigerator 33 is in a stable working state, when the temperature detected by the fourth temperature sensor 34 increases, the cooling capacity of the refrigerator 33 is increased, and when the temperature detected by the fourth temperature sensor 34 decreases, the cooling capacity of the refrigerator 33 is reduced, so that the temperature of the cooling medium is maintained within a set temperature range.

[0055] Furthermore, the cooling unit 30 also includes a temperature control alarm module (not shown). When the temperature of the coolant detected by the fourth temperature sensor 34 is greater than 10°C, it proves that the refrigerator 33 has failed. The fourth temperature sensor 34 sends the temperature information to the control system, and the control system issues a shutdown command. At the same time, a corresponding alarm message is issued through the temperature control alarm module.

[0056] Optionally, in one embodiment, a third pressure sensor 35 is further provided on the cooling pipeline, and the third pressure sensor 35 is used to detect the pressure of the coolant in the cooling pipeline, and trigger an alarm when the pressure of the coolant exceeds a design value.

[0057] Optionally, in one embodiment, a liquid level switch 36 is provided in the liquid storage tank 31, and the liquid level switch 36 is used to monitor the liquid level height in the liquid storage tank 31. Thus, when the liquid level in the liquid storage tank 31 is low, the liquid level switch 36 triggers a low liquid level alarm, and the staff can add refrigerant according to the alarm information to ensure that the refrigerant is maintained at a set liquid level height, thereby avoiding the inability of the tritium carbon sampling system to accurately sample and safety problems caused by refrigerant leakage.

[0058] Optionally, in one embodiment, the cooling unit 30 further includes a second radiator (not shown), which is connected to the hot end of the refrigerator 33 to cool the hot end of the refrigerator 33. When the ambient temperature is high or the temperature of the coolant discharged from the refrigerator 33 is detected to be high, the cooling performance of the refrigerator 33 can be improved by dissipating the heat from the hot end of the refrigerator 33 through the second radiator. Specifically, in one embodiment, it includes a second liquid storage tank, a second pump body, a heat sink 322, a fan and a second cooling pipe. The second liquid storage tank is also used to store coolant. One end of the second cooling pipe is connected to the liquid outlet of the second liquid storage tank, and the other end of the second cooling pipe is connected to the liquid inlet of the second liquid storage tank after passing through the second pump body, the hot end of the refrigerator 33 and the heat sink, and the air outlet side of the fan faces the heat sink. During operation, the second pump body pumps the coolant from the liquid outlet of the second liquid storage tank to the second cooling pipe, and then the coolant passes through the hot end of the refrigerator 33 along the second cooling pipe, and the coolant exchanges heat with the hot end of the refrigerator 33 to reduce the temperature of the hot end of the refrigerator 33, thereby improving the refrigeration performance of the refrigerator 33. Then, the high-temperature coolant after heat exchange continues to flow through the heat sink along the second cooling pipe, and the fan blows air to the heat sink to reduce the temperature of the coolant flowing through the heat sink, and finally the cooled coolant flows back to the second liquid storage tank along the second cooling pipe, and the cycle is carried out to achieve continuous heat dissipation of the hot end of the refrigerator 33.

[0059] See also Figure 5 Optionally, in one embodiment, the air extraction unit 40 includes an air extraction pump 42 connected to the absorption unit 20 and a fourth pressure sensor 41 connected between the absorption unit 20 and the air extraction pump 42. Specifically, the air extraction pump 42 can be a linear armature pump, which has good reliability and a long service life. Furthermore, the linear armature pump can automatically adjust the output frequency to change the air extraction capacity of the pump based on the comparison between the actual flow measurement value and the system setting value. The fourth pressure sensor 41 is used to monitor the vacuum degree of the air extraction pump 42. When the vacuum degree is high, the system alarm is triggered and the air extraction operation is stopped to avoid safety accidents.

[0060] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0061] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A tritium carbon sampling system, characterized in that: It comprises an air intake unit, an absorption unit and an air extraction unit which are connected in sequence; wherein the air intake unit comprises a coarse filter and at least one fine filter which are connected in sequence, and along the air intake direction, the inlet side of the first fine filter of the at least one fine filter is connected to a first pressure sensor, and the outlet side of the last fine filter is connected to a second pressure sensor.

2. The tritium carbon sampling system according to claim 1, characterized in that: A flow sensor is also provided on the gas pipeline of the air intake unit.

3. The tritium carbon sampling system according to claim 1, characterized in that: The absorption unit comprises a front-end absorption bottle, a catalytic oxidation module and a rear-end absorption bottle which are connected in sequence. The front-end absorption bottle is connected to the air intake unit, and the rear-end absorption bottle is connected to the air extraction unit.

4. The tritium carbon sampling system according to claim 3, characterized in that: The catalytic oxidation module comprises: A catalytic reactor, the catalytic reactor is connected between the front-stage absorption bottle and the rear-stage absorption bottle, the catalytic reactor comprises a heating element for heating the gas and a first temperature sensor for detecting the heating temperature of the heating element; a second temperature sensor, the second temperature sensor being disposed at an outlet side of the catalytic reactor and being used to detect a gas temperature at an outlet of the catalytic reactor; A first radiator, which is disposed between the second temperature sensor and the rear-stage absorption bottle and is used to cool the gas; A third temperature sensor is disposed at the outlet side of the first radiator, and is used to detect the gas temperature at the outlet of the first radiator.

5. The tritium carbon sampling system according to claim 4, characterized in that: The tritium carbon sampling system also includes a cooling unit, which is connected to both the front-end absorption bottle and the rear-end absorption bottle, and is used to cool the front-end absorption bottle and the rear-end absorption bottle.

6. The tritium carbon sampling system according to claim 5, characterized in that: The cooling unit is also connected between the third temperature sensor and the rear-stage absorption bottle, and the cooling unit is used to cool the gas entering the rear-stage absorption bottle.

7. The tritium carbon sampling system according to claim 5, characterized in that: The cooling unit comprises a liquid storage tank, a circulation pump and a refrigerator. The liquid storage tank, the circulation pump and the refrigerator are connected through a cooling pipeline to form a cooling circuit. The cooling pipeline passes through the front-end absorption bottle and the rear-end absorption bottle.

8. The tritium carbon sampling system according to claim 7, characterized in that: A fourth temperature sensor is provided on the outlet side of the refrigerator, and the fourth temperature sensor is used to detect the coolant temperature on the outlet side of the refrigerator; and / or, a third pressure sensor is also provided on the cooling pipeline, and the third pressure sensor is used to detect the pressure of the coolant in the cooling pipeline.

9. The tritium carbon sampling system according to claim 7, characterized in that: The cooling unit also includes a second radiator, which is connected to the hot end of the refrigerator to cool the hot end of the refrigerator; and / or a liquid level switch is provided in the liquid storage tank, and the liquid level switch is used to monitor the liquid level height in the liquid storage tank.

10. The tritium carbon sampling system according to claim 7, characterized in that: The air extraction unit includes an air extraction pump connected to the absorption unit and a fourth pressure sensor connected between the absorption unit and the air extraction pump.

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