Gas detection system

Abstract

A gas detection system (1000). The gas detection system (1000) is used for detecting a target element in gas to be detected. The gas detection system (1000) comprises a gas intake unit (10), an impurity removal unit (20), a sampling unit (30) and a detection unit (40), wherein the gas output end of the gas intake unit (10) is connected to the gas intake end of the impurity removal unit (20), the gas output end of the impurity removal unit (20) is connected to the gas intake end of the sampling unit (30), and the gas output end of the sampling unit (30) is connected to the gas intake end of the detection unit (40). The impurity removal unit (20) is used for filtering impurities in the gas to be detected; the sampling unit (30) is used for adsorbing the target element from the gas to be detected and desorbing the target element; and the detection unit (40) is used for detecting the target element desorbed from the sampling unit (30). The gas detection system (1000) can improve the detection precision thereof for low-concentration radioactive gas.

Description

Gas detection system Technical Field

[0001] This application relates to the field of gas detection technology, and in particular to a gas detection system. Background Technology

[0002] During the operation of nuclear facilities, airborne radioactive effluents must be purified before being released into the atmosphere through chimneys. The emitted airborne radioactive effluents must be monitored to ensure that the emissions do not pollute the environment and to achieve sustainable development.

[0003] In related technologies, gas detection systems detect airborne radioactive effluents through detection units. However, due to the low concentration of radioactive gas in the effluents, the detection accuracy of existing detection technologies and equipment is easily affected. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a gas detection system that can improve the detection accuracy of gas detection systems for low concentrations of radioactive gases.

[0005] According to an embodiment of this application, a gas detection system is used to detect target elements in a gas to be tested. The gas detection system includes an inlet unit, a purification unit, a sampling unit, and a detection unit.

[0006] The outlet of the air inlet unit is connected to the inlet of the impurity removal unit, the outlet of the impurity removal unit is connected to the inlet of the sampling unit, and the outlet of the sampling unit is connected to the inlet of the detection unit. The impurity removal unit is used to filter impurities in the gas to be tested, the sampling unit is used to adsorb and desorb target elements from the gas to be tested, and the detection unit is used to detect the target elements desorbed from the sampling unit.

[0007] The heat dissipation structure according to the embodiments of this application has at least the following beneficial effects:

[0008] By setting up a purification unit between the gas inlet unit and the sampling unit, the gas to be tested can be filtered by the purification unit before entering the sampling unit, preventing impurities in the gas to be tested from entering the sampling unit and affecting the sensitivity of the subsequent detection unit. At the same time, the sampling unit only adsorbs the target element in the gas to be tested. After the sampling unit completes the enrichment of the target element, the detection unit is used to detect the target element desorbed from the sampling unit. In this way, the detection accuracy of the gas detection system for low-concentration radioactive gases can be improved.

[0009] According to some embodiments of this application, the impurity removal unit includes an impurity removal tube and an impurity removal material. The air inlet and outlet of the impurity removal unit are disposed in the impurity removal tube, and the impurity removal material is disposed inside the impurity removal tube. The impurity removal material is used to adsorb at least one of moisture, nitrogen, oxygen and dust in the gas to be tested.

[0010] According to some embodiments of this application, the impurity removal tube is made of transparent material, and the impurity removal material is a color-changing desiccant, anhydrous calcium chloride, caustic soda, or anhydrous calcium sulfate.

[0011] According to some embodiments of this application, the sampling unit includes a sampling tube, an adsorbent material, and a first heating device. The inlet and outlet of the sampling unit are disposed in the sampling tube, the adsorbent material is disposed inside the sampling tube, and the first heating device is used to adjust the temperature of the adsorbent material so that the adsorbent material adsorbs or desorbs the target element from the gas to be tested.

[0012] According to some embodiments of this application, the adsorbent is a first porous media material, which includes at least one of MOFs, COFs, activated carbon, molecular sieves, and separation membrane materials.

[0013] According to some embodiments of this application, the gas detection system further includes a separation unit, the inlet of which is connected to the outlet of the sampling unit, and the outlet of which is connected to the inlet of the detection unit.

[0014] The separation unit is used to adsorb at least one set element from multiple target elements flowing out of the sampling unit, and the detection unit is used to detect target elements other than the set element.

[0015] Additionally, the separation unit is used to desorb the set element, and the detection unit is used to detect the set element.

[0016] According to some embodiments of this application, the separation unit includes a separation tube, a separation material, and a second heating device. The air inlet and outlet of the separation unit are disposed in the separation tube, and the separation material is disposed inside the separation tube. The second heating device is used to adjust the temperature of the separation material so that the separation material adsorbs at least one set element from the multiple target elements flowing out of the sampling unit, or desorbs a set element.

[0017] According to some embodiments of this application, the separating material is a second porous media material, which includes at least one of MOFs, COFs, activated carbon, molecular sieves, and separation membranes.

[0018] According to some embodiments of this application, the gas detection system further includes a pressure stabilizing unit, wherein the inlet end of the pressure stabilizing unit is connected to the outlet end of the inlet unit, and the outlet end of the pressure stabilizing unit is connected to the inlet end of the impurity removal unit; or, the inlet end of the pressure stabilizing unit is connected to the outlet end of the impurity removal unit, and the outlet end of the pressure stabilizing unit is connected to the inlet end of the sampling unit. The pressure stabilizing unit is used to buffer and stabilize the gas to be tested.

[0019] According to some embodiments of this application, the gas detection system further includes a monitoring unit, the inlet of which is connected to the outlet of the sampling unit, and the monitoring unit is used to monitor whether there is a target element in the gas to be tested flowing out of the sampling unit.

[0020] Specifically, when the monitoring unit detects that there is a target element in the gas to be tested flowing out of the sampling unit, the air intake unit is configured to stop air intake, the sampling unit is configured to desorb the target element, and the detection unit is configured to detect the target element desorbed from the sampling unit.

[0021] According to some embodiments of this application, the gas detection system further includes a first gas driving unit, which is disposed between the outlet end of the inlet unit and the inlet end of the sampling unit, and is used to accelerate gas flow.

[0022] And / or, the gas detection system further includes a second gas driving unit, which is connected to the gas outlet of the detection unit and is used to accelerate gas flow.

[0023] According to some embodiments of this application, the gas detection system further includes a first inflation unit, the outlet of the first inflation unit being connected to the inlet unit, and the first inflation unit being used to provide carrier gas to the inlet unit to deliver the gas to be tested.

[0024] And / or, the gas detection system further includes a second inflation unit, the outlet of which is connected to the inlet of the sampling unit, the second inflation unit being used to provide activation gas to the sampling unit.

[0025] According to some embodiments of this application, the gas detection system further includes a mounting plate, which includes at least two sub-plates, on which a cleaning unit, a sampling unit, and a detection unit are distributed;

[0026] In this structure, at least two sub-boards are spliced ​​together to form a single-layer structure, or at least two sub-boards are stacked to form a stacked structure.

[0027] According to some embodiments of this application, the gas detection system further includes a transition tube, with both ends of the transition tube extending to two sub-plates respectively. The transition tube is detachably connected to the impurity removal unit, sampling unit, or detection unit on the two sub-plates.

[0028] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0029] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0030] Figure 1 is a schematic diagram of the gas detection system provided in an embodiment of this application;

[0031] Figure 2 is another schematic diagram of the gas detection system provided in an embodiment of this application;

[0032] Figure 3 is a perspective view of a gas detection system provided in an embodiment of this application;

[0033] Figure 4 is a perspective view of another structure of the gas detection system provided in an embodiment of this application;

[0034] Figure 5 is a perspective view of another structure of the gas detection system provided in the embodiment of this application from another angle.

[0035] Reference numerals: Gas detection system 1000; Inlet unit 10; Impurity removal unit 20; Impurity removal tube 21; Sampling unit 30; Sampling tube 31; First heating device 32; First heating element 321; First temperature control module 322; Detection unit 40; Pressure stabilizing unit 50; Monitoring unit 60; First gas driving unit 70; Second gas driving unit 80; First gas filling unit 90; Second gas filling unit 100; Third gas filling unit 110; Separation unit 120; Separation tube 121; Second heating device 122; Second heating element 1221; Second temperature control module 1222; Mounting plate 130; Sub-plate 131; Transition tube 140; Pressure sensor P; First flow meter F1; Second flow meter F2; Third flow meter F3; Fourth flow meter F4; First three-way valve TV1; Second three-way valve TV2; Third three-way valve TV3. Detailed Implementation

[0036] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0037] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0038] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0039] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0040] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0041] Please refer to Figure 1. This application embodiment provides a gas detection system 1000 for detecting target elements in a test gas introduced from emitted exhaust gas, so as to obtain the content of the target element in the test gas, thereby ensuring that the emission of exhaust gas will not cause pollution to the environment and achieve sustainable development.

[0042] The gas detection system 1000 includes an inlet unit 10, a purification unit 20, a sampling unit 30, and a detection unit 40. The outlet of the inlet unit 10 is connected to the inlet of the purification unit 20, the outlet of the purification unit 20 is connected to the inlet of the sampling unit 30, and the outlet of the sampling unit 30 is connected to the inlet of the detection unit 40. The purification unit 20 is used to filter impurities in the gas to be tested, the sampling unit 30 is used to adsorb and desorb target elements from the gas to be tested, and the detection unit 40 is used to detect the target elements desorbed from the sampling unit.

[0043] Specifically, by introducing the exhaust gas into the intake end of the intake unit 10, the gas to be tested is filtered by the impurity removal unit 20 and then enters the sampling unit 30. The sampling unit 30 adsorbs the target element in the gas to be tested, thereby enriching the target element in the gas to be tested in the sampling unit 30. After the sampling unit 30 completes the enrichment of the target element in the gas to be tested, the target element in the sampling unit 30 enters the detection unit 40 and is detected by the detection unit 40 to obtain the content of the target element.

[0044] In this embodiment, by setting a purification unit 20 between the air intake unit 10 and the sampling unit 30, the gas to be tested can be filtered by the purification unit 20 before entering the sampling unit 30, thus preventing impurities in the gas to be tested from entering the sampling unit 30 and affecting the sensitivity of the subsequent detection unit 40. At the same time, the sampling unit 30 only adsorbs the target elements in the gas to be tested. After the sampling unit 30 completes the enrichment of the target elements, the detection unit 40 is used to detect the target elements desorbed by the sampling unit 30. In this way, the detection accuracy of the gas detection system 1000 for low-concentration radioactive gases can be improved.

[0045] In some embodiments, the impurity removal unit 20 includes an impurity removal tube 21 and an impurity removal material. The air inlet and outlet of the impurity removal unit 20 are disposed in the impurity removal tube 21, and the impurity removal material is disposed inside the impurity removal tube 21. The impurity removal material is used to adsorb at least one of moisture, nitrogen, oxygen and dust in the gas to be tested, so as to prevent impurities from entering the sampling unit 30 with the gas to be tested and affecting the sensitivity of subsequent detection.

[0046] In some embodiments, the impurity removal tube 21 is made of transparent material. By making the impurity removal tube 21 transparent, the operator can easily observe the state changes of the impurity removal material inside the impurity removal tube 21, so that the impurity removal material can be replaced in time or removed, dried and reinstalled for use.

[0047] The impurity removal materials are color-changing desiccant, anhydrous calcium chloride, caustic soda, or anhydrous calcium sulfate.

[0048] The color-changing desiccant effectively adsorbs moisture, dust, and other impurities in the gas being tested, ensuring the dryness and purity of the gas entering the sampling unit 30 after passing through the impurity removal tube 21. The color-changing desiccant changes color according to the amount of moisture it adsorbs. The operator can observe the color change of the desiccant inside the impurity removal tube 21 to determine whether the desiccant has reached saturation. When the desiccant reaches saturation, the operator can remove the impurity removal tube 21 to replace the desiccant inside, or remove the desiccant, dry it, and reinstall it for use.

[0049] Optionally, the color-changing desiccant can be silica gel desiccant particles. In its initial state (before adsorbing moisture), the silica gel desiccant particles are dark blue. During the process of adsorbing moisture in the gas to be tested, the silica gel particles gradually turn light blue. As moisture is gradually adsorbed, the silica gel particles change from light blue to red. When the silica gel particles turn pink or translucent red, it indicates that the silica gel particles have reached a saturated adsorption state.

[0050] Anhydrous calcium chloride, caustic soda, and anhydrous calcium sulfate can all effectively adsorb moisture and other impurities in the gas being tested. Anhydrous calcium chloride is initially a white or grayish-white solid, which can be in granular, lumpy, or powder form. Caustic soda is initially a white solid, which can be in flake or lumpy form. Anhydrous calcium sulfate is initially a white solid, which can be powder or crystals. During the adsorption of moisture from the gas being tested, anhydrous calcium chloride gradually changes from a solid to a liquid state. When anhydrous calcium chloride dissolves into a liquid state, it indicates that it has reached a saturated adsorption state. The same applies to caustic soda and anhydrous calcium sulfate.

[0051] In some embodiments, the gas detection system 1000 further includes a first flow meter F1, which is disposed at the inlet or outlet of the impurity removal unit 20. The first flow meter F1 is used to measure the amount of gas entering the impurity removal unit 20. After the detection unit 40 completes the detection of the target element and obtains the content of the target element, the concentration of the target element in the gas can be calculated by combining the amount of gas entering the test.

[0052] In some embodiments, the sampling unit 30 includes a sampling tube 31, an adsorbent material, and a first heating device 32. The inlet and outlet of the sampling unit 30 are located within the sampling tube 31. The adsorbent material is disposed within the sampling tube 31 and is used to adsorb or desorb target elements from the gas to be tested. The first heating device 32 is used to heat the adsorbent material to a first temperature or a second temperature. When the adsorbent material is heated to the first temperature, it is activated, allowing it to adsorb target elements from the gas to be tested entering the sampling tube 31. When the adsorbent material is heated to the second temperature, the target elements enriched on the adsorbent material can desorb from it, allowing the target elements to flow to the detection unit 40.

[0053] Specifically, the first heating device 32 includes a first heating element 321 and a first temperature control module 322. The first heating element 321 and the first temperature control module 322 are disposed on the outside of the sampling tube 31. The first temperature control module 322 is connected to the first heating element 321 and is used to control the heating temperature of the first heating element 321 so that the adsorbent material can be heated to a first temperature or a second temperature by the first heating element 321.

[0054] In some embodiments, the adsorbent material is a first porous media material, which includes at least one of MOFs, COFs, activated carbon, molecular sieves, and separation membranes. MOFs, COFs, activated carbon, molecular sieves, and separation membranes all have a large number of pores, which provide an extremely high specific surface area, offering numerous adsorption sites for the target element. MOFs, COFs, activated carbon, molecular sieves, and separation membranes can adsorb and enrich the target element while filtering out non-target elements.

[0055] Among them, MOFs and COFs can capture and fix target elements more effectively, with high adsorption efficiency and stability, good selectivity, and no radioactive deactivation due to the release of the gas to be tested.

[0056] The following is an illustrative description of the preparation of the adsorbent material: MOFs and / or COFs are ground into uniform powder. A certain amount of powder is placed in a beaker, and appropriate amounts of methylcellulose and deionized water are added. The mixture is stirred continuously until a viscous paste is formed. Then, the paste is transferred to a molding device and extruded to obtain spherical MOFs and / or COFs particles. The spherical particles are dried in a vacuum oven at 60°C for a certain period of time to obtain the molded material of MOFs and / or COFs. Finally, the molded material is inserted into the sampling tube 31. Alternatively, if a smaller particle size molded material is required, the MOFs and / or COFs particles can be crushed and sieved to obtain a molded material of the appropriate size.

[0057] Since changes in the pressure of the gas to be tested can affect the density and flow characteristics of the gas, thereby affecting the accuracy of subsequent detection results, in some embodiments, the gas detection system 1000 further includes a pressure stabilizing unit 50. The inlet of the pressure stabilizing unit 50 is connected to the outlet of the inlet unit 10, and the outlet of the pressure stabilizing unit 50 is connected to the inlet of the impurity removal unit 20. Alternatively, the inlet of the pressure stabilizing unit 50 is connected to the outlet of the impurity removal unit 20, and the outlet of the pressure stabilizing unit 50 is connected to the inlet of the sampling unit 30. The pressure stabilizing unit 50 is used to buffer and stabilize the gas to be tested. Before the gas to be tested enters the impurity removal unit 20 or the sampling unit 30 through the pressure stabilizing unit 50, it can be buffered in the pressure stabilizing unit 50 for a certain period of time (e.g., 5 seconds) to make the pressure of the gas to be tested tend to stabilize. This embodiment uses a pressure stabilizing unit 50 to stabilize the gas under test, which ensures the consistency of gas conditions during each measurement, thereby improving the repeatability and reliability of the detection. Furthermore, it ensures that the gas enters the subsequent pipeline at a suitable pressure, avoiding insufficient gas flow due to low gas pressure, thus preventing any impact on the sensitivity and accuracy of the detection and guaranteeing the detection effect.

[0058] In some embodiments, the gas detection system 1000 further includes a pressure sensor P, which is connected to the pressure stabilizing unit 50. The pressure sensor P is used to detect the pressure of the gas to be tested in the pressure stabilizing unit 50. Before the gas to be tested in the pressure stabilizing unit 50 flows from its outlet to the impurity removal unit 20 or the sampling unit 30, the connection between the pressure stabilizing unit 50 and the impurity removal unit 20 or the sampling unit 30 is disconnected. When the gas pressure value displayed by the pressure sensor P stabilizes, it indicates that the gas to be tested in the pressure stabilizing unit 50 has been stabilized. At this time, the pressure stabilizing unit 50 and the impurity removal unit 20 or the sampling unit 30 can be connected so that the gas to be tested in the pressure stabilizing unit 50 flows from its outlet to the impurity removal unit 20 or the sampling unit 30.

[0059] In some embodiments, the gas detection system 1000 further includes a monitoring unit 60, the inlet of which is connected to the outlet of the sampling unit 30. The monitoring unit 60 is used to monitor whether there is a target element in the gas to be tested flowing out of the sampling unit 30. Specifically, when the monitoring unit 40 detects the presence of a target element in the gas to be tested flowing out of the sampling unit 30, it indicates that the sampling unit 30 has completed the adsorption and enrichment of the target element in the gas to be tested. The inlet unit 10 is configured to stop inleting gas, the sampling unit 30 is configured to desorb the target element, and the detection unit 40 is configured to detect the target element desorbed from the sampling unit 30.

[0060] During the adsorption process of the sample unit 30 on the incoming gas to be tested, the outlet of the sample unit 30 is connected to the inlet of the monitoring unit 60. Initially, all the target elements in the gas to be tested will be adsorbed by the sample unit 30. There are no target elements in the gas flowing from the sample unit 30 to the monitoring unit 60, and the monitoring unit 60 will not detect the target elements, which means that the adsorption of the target elements by the sample unit 30 has not yet reached saturation. After the gas to be tested has been introduced for a period of time, the target elements that the sample unit 30 can adsorb have reached the maximum amount, and the sample unit 30 will not continue to adsorb the target elements. The target elements appear in the gas flowing from the sample unit 30 to the monitoring unit 60, and the monitoring unit 60 detects the target elements, which means that the sample unit 30 has completed the adsorption and enrichment of the target elements in the gas to be tested, which means that the adsorption of the target elements by the sample unit 30 has reached saturation. At this time, the intake of the inlet unit 10 can be stopped.

[0061] In some embodiments, the monitoring unit 60 may be a liquid scintillation counter, a high-purity germanium gamma spectrometer, etc.

[0062] In some embodiments, the gas detection system 1000 further includes a second flow meter F2, which is disposed at the air inlet of the monitoring unit 60 and is used to measure the amount of gas to be tested flowing into the monitoring unit 60 from the sampling unit 30.

[0063] In some embodiments, the gas detection system 1000 further includes a first gas driving unit 70, which is disposed between the outlet end of the inlet unit 10 and the inlet end of the sampling unit 30. The first gas driving unit 70 is used to accelerate the gas flow so that the gas to be tested can flow smoothly in the pipeline of the gas monitoring system, avoiding the inability to flow to the next stage due to the small gas flow rate.

[0064] In some embodiments, the gas detection system 1000 further includes a second gas driving unit 80. The second gas driving unit 80 is connected to the gas outlet of the detection unit 40. The second gas driving unit 80 is used to accelerate the gas flow so that the gas to be tested can flow smoothly in the pipeline of the gas monitoring system, avoiding the inability to flow to the next stage due to insufficient gas flow.

[0065] In some embodiments, a first gas driving unit 70 is disposed between the outlet of the pressure stabilizing unit 50 and the inlet of the sampling unit 30; a second gas driving unit 80 is disposed between the outlet of the sampling unit 30 and the inlet of the detection unit 40. The second gas driving unit 80, the outlet of the sampling unit 30, and the inlet of the monitoring unit 60 are connected by a first three-way valve TV1. The inlet and outlet of the detection unit 40 can share the same port, meaning that the inlet and outlet of the detection unit 40 achieve air intake and exhaust through the same port.

[0066] In some embodiments, the first gas drive unit 70 and the second gas drive unit 80 are vacuum pumps.

[0067] In some embodiments, the gas detection system 1000 further includes a first inflation unit 90, the outlet of which is connected to the inlet unit 10. The first inflation unit 90 is used to provide carrier gas to the inlet unit 10 to deliver the gas to be tested, preventing the gas to be tested from failing to flow to the next stage due to its small volume. The outlet of the inlet unit 10, the inlet of the impurity removal unit 20, and the outlet of the first inflation unit 90 are connected by a second three-way valve TV2.

[0068] In some embodiments, the carrier gas is an inert gas, such as nitrogen or argon.

[0069] In some embodiments, the gas detection system 1000 further includes a second inflation unit 100, the outlet of which is connected to the inlet of the sampling unit 30. The second inflation unit 100 provides an activating gas to the sampling unit 30 to restore or activate the adsorption sites on the adsorbent material, bringing them to an optimal state, thereby improving the adsorption efficiency for the target nucleus. The inlet of the sampling unit 30, the outlet of the pressure stabilizing unit 50, and the outlet of the second inflation unit 100 are connected via a third three-way valve TV3.

[0070] In some embodiments, the gas detection system 1000 further includes a third flow meter F3, which is disposed at the outlet of the second inflation unit 100 and is used to measure the amount of activation gas flowing from the second inflation unit 100 into the sampling unit 30.

[0071] In some embodiments, the gas detection system 1000 further includes a third gas filling unit 110. The gas outlet of the third gas filling unit 110 is connected to the detection unit 40. The third gas filling unit 110 is used to provide working gas to the detection unit 40. The working gas can be ionized by incident radioactive particles (such as alpha particles, beta particles, gamma rays, etc.) in the detection unit 40 to generate free electrons and positive ions. These charged particles move under the action of an electric field to form current pulses, which are then detected by the detection unit 40.

[0072] In some embodiments, the gas detection system 1000 further includes a fourth flow meter F4, which is disposed at the outlet of the third inflation unit 110 and is used to measure the amount of activation gas flowing from the second inflation unit 100 into the sampling unit 30.

[0073] When there are two or more target elements in the gas to be tested, if it is necessary to measure the content of a specific element individually, the target elements need to be separated. Therefore, in some embodiments, the gas detection system 1000 further includes a separation unit 120. The inlet of the separation unit 120 is connected to the outlet of the sampling unit 30, and the outlet of the separation unit 120 is connected to the inlet of the detection unit 40. Specifically, the separation unit 120 is used to adsorb at least one specific element from the multiple target elements flowing out of the sampling unit 30, and the detection unit 40 is used to detect the target elements other than the specific element. Additionally, the separation unit 30 is used to desorb the specific element, and the detection unit 40 is used to detect the specific element.

[0074] Specifically, during the separation of the set elements, the connection between the sampling unit 30 and the separation unit 120 is first disconnected. After the gas to be tested enters the sampling unit 30, the sampling unit 30 adsorbs and enriches all the target elements. After the sampling unit 30 completes the enrichment of all the target elements, the sampling unit 30 and the separation unit 120 are connected, and all the target elements in the sampling unit 30 are desorbed from the sampling unit 30 and flow to the separation unit 120. At this time, the separation unit 120 can adsorb and enrich the set elements, while the target elements other than the set elements enter the detection unit 40 through the separation unit 120 and are detected by the detection unit 40. In this process, the separation unit 120 separates the target elements flowing out of the sampling unit 30. When the detection unit 40 completes the detection of the target elements other than the set elements, the set elements in the separation unit 120 are desorbed from the separation unit 120 and enter the detection unit 40 for detection.

[0075] Referring to Figure 2, in some embodiments, the separation unit 120 includes a separation tube 121, a separation material, and a second heating device 122. The inlet and outlet of the separation unit 120 are located in the separation tube 31, and the separation material is disposed within the separation tube 121. The second heating device 122 is used to regulate the temperature of the separation material so that the separation material adsorbs or desorbs at least one set element from the multiple target elements flowing out of the sampling unit 30. The second heating device 122 is used to heat the separation material to a third or fourth temperature. When the separation material is heated to the third temperature, the separation material is activated, thereby allowing the separation material to adsorb a certain target element entering the separation tube 121. When the adsorbed material is heated to the fourth temperature, the certain target element enriched on the separation material can be desorbed from the separation material, thereby allowing the certain target element to flow to the detection unit 40.

[0076] Specifically, the second heating device 122 includes a second heating element 1221 and a second temperature control module 1222. The second heating element 1221 and the second temperature control module 1222 are disposed on the outside of the separation tube 121. The second temperature control module 1222 is connected to the second heating element 1221 and is used to control the heating temperature of the second heating element 1221 so that the separation material can be heated to a third temperature or a fourth temperature by the second heating element 1221.

[0077] In some embodiments, the separating material is a second porous media material, which includes at least one of MOFs, COFs, activated carbon, molecular sieves, and separation membranes. MOFs, COFs, activated carbon, molecular sieves, and separation membranes all have a large number of pores, which provide an extremely high specific surface area, offering numerous adsorption sites for the target element. MOFs, COFs, activated carbon, molecular sieves, and separation membranes can adsorb and enrich the target element while filtering out non-target elements.

[0078] The first three-way valve TV1 is connected to the outlet of the sampling unit 30, the inlet of the monitoring unit 60, and the inlet of the separation unit 120.

[0079] Referring to Figure 3, in some embodiments, the gas detection system 1000 further includes a mounting plate 130, which includes at least two sub-plates 131. The impurity removal unit 20, the sampling unit 30, and the detection unit 40 are distributed on the at least two sub-plates 131. In this way, each sub-plate 131 can support and fix the corresponding unit, allowing each sub-plate 131 and the unit disposed thereon to be modularized. That is, a sub-plate 131 and the corresponding unit form a module, thus enabling modular assembly and disassembly, which is convenient for packaging and transportation.

[0080] As shown in Figure 3, at least two sub-plates 131 are spliced ​​together to form a single-layer structure, which allows the mounting plate 130 and the units disposed on the mounting plate 130 to be laid out flat, reducing the space occupied in the direction perpendicular to the surface of the sub-plate 131; or, as shown in Figures 4 and 5, at least two sub-plates 131 are stacked to form a stacked structure, which allows the mounting plate 130 and the units disposed on the mounting plate 130 to be stacked, reducing the space occupied in the direction parallel to the surface of the sub-plate 131.

[0081] In some embodiments, the gas detection system 1000 further includes a transition tube 140, with both ends of the transition tube 140 extending to two sub-plates 131 respectively. The transition tube 140 is detachably connected to the impurity removal unit 20, sampling unit 30 or detection unit 40 on the two sub-plates 131 to realize the pipeline connection between the impurity removal unit 20, sampling unit 30 and detection unit 40 on different sub-plates 131. That is, the units set on different sub-plates 131 can be connected by the transition tube 140.

[0082] In some embodiments, there are two sub-boards 131, with one side of one sub-board 131 facing the other side of the other sub-board 131 to form a single-layer structure, or the two sub-boards 131 are stacked to form a double-layer structure. The impurity removal unit 20, the detection unit 40, and the second gas driving unit 80 are mounted on one of the sub-boards 131, forming a module with the other sub-board 131. The sampling unit 30, the voltage stabilizing unit 50, and the first gas driving unit 70 are mounted on the other sub-board 131, forming another module with the other sub-board 131.

[0083] The impurity removal unit 20 and the voltage stabilizing unit 50 are connected by a transition pipe 140, which is detachably connected between them. This facilitates quick assembly and disassembly of the piping between the impurity removal unit 20 and the voltage stabilizing unit 50, allowing them to be connected or disconnected. Similarly, the sampling unit 30 and the second gas driving unit 80 are connected by the transition pipe 140, which is also detachably connected between them. This facilitates quick assembly and disassembly of the piping between the sampling unit 30 and the second gas driving unit 80, allowing them to be connected or disconnected. These features allow the mounting plate 130 and the units mounted on it to be easily detached to form two modules, facilitating packaging and transportation.

[0084] The transition pipe 140 can be directly connected to the corresponding unit, or indirectly connected to the corresponding unit through the corresponding flow meter or valve. For example, as shown in Figures 4 and 5, a transition pipe 140 is provided between the impurity removal unit 20 and the pressure stabilizing unit 50. The two ends of the transition pipe 140 extend to the two sub-plates 131 respectively. One end of the transition pipe 140 is indirectly connected to the impurity removal unit 20 through the first flow meter F1, and the other end of the transition pipe 140 is directly connected to the pressure stabilizing unit 50. The transition pipe 140 can be a pipe or a combination of a quick connector and a pipe.

[0085] Furthermore, the air intake unit 10, monitoring unit 60, first inflation unit 90, second inflation unit 100, and third inflation unit 110 are all located on the outside of the mounting plate 130. Of course, if needed, the air intake unit 10, monitoring unit 60, first inflation unit 90, second inflation unit 100, and / or third inflation unit 110 can also be mounted on the sub-plate 131.

[0086] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.

Claims

1. A gas detection system for detecting a target element in a gas to be tested, characterized in that, It includes an intake unit, a cleaning unit, a sampling unit, and a detection unit; The outlet of the air inlet unit is connected to the inlet of the impurity removal unit, the outlet of the impurity removal unit is connected to the inlet of the sampling unit, and the outlet of the sampling unit is connected to the inlet of the detection unit. The impurity removal unit is used to filter impurities in the gas to be tested, the sampling unit is used to adsorb and desorb the target element from the gas to be tested, and the detection unit is used to detect the target element desorbed from the sampling unit.

2. The gas detection system according to claim 1, characterized in that, The impurity removal unit includes an impurity removal tube and an impurity removal material. The air inlet and air outlet of the impurity removal unit are disposed in the impurity removal tube, and the impurity removal material is disposed inside the impurity removal tube. The impurity removal material is used to adsorb at least one of moisture, nitrogen, oxygen and dust in the gas to be tested.

3. The gas detection system according to claim 2, characterized in that, The impurity removal tube is made of transparent material, and the impurity removal material is a color-changing desiccant, anhydrous calcium chloride, caustic soda, or anhydrous calcium sulfate.

4. The gas detection system according to claim 1, characterized in that, The sampling unit includes a sampling tube, an adsorbent material, and a first heating device. The inlet and outlet of the sampling unit are located in the sampling tube, and the adsorbent material is disposed inside the sampling tube. The first heating device is used to adjust the temperature of the adsorbent material so that the adsorbent material adsorbs or desorbs the target element from the gas to be tested.

5. The gas detection system according to claim 4, characterized in that, The adsorption material is a first porous medium material, which includes at least one of MOFs, COFs, activated carbon, molecular sieves, and separation membranes.

6. The gas detection system according to claim 1, characterized in that, The gas detection system further includes a separation unit, the inlet of which is connected to the outlet of the sampling unit, and the outlet of which is connected to the inlet of the detection unit. The separation unit is used to adsorb at least one set element from multiple target elements flowing out of the sampling unit, and the detection unit is used to detect the target elements other than the set element. Furthermore, the separation unit is used to desorb the set element, and the detection unit is used to detect the set element.

7. The gas detection system according to claim 6, characterized in that, The separation unit includes a separation tube, a separation material, and a second heating device. The air inlet and air outlet of the separation unit are disposed in the separation tube, and the separation material is disposed inside the separation tube. The second heating device is used to adjust the temperature of the separation material so that the separation material adsorbs at least one set element from the multiple target elements flowing out of the sampling unit, or desorbs the set element.

8. The gas detection system according to claim 6, characterized in that, The separation material is a second porous media material, which includes at least one of MOFs, COFs, activated carbon, molecular sieves, and separation membranes.

9. The gas detection system according to claim 1, characterized in that, The gas detection system further includes a pressure stabilizing unit. The inlet of the pressure stabilizing unit is connected to the outlet of the inlet unit, and the outlet of the pressure stabilizing unit is connected to the inlet of the impurity removal unit. Alternatively, the inlet of the pressure stabilizing unit is connected to the outlet of the impurity removal unit, and the outlet of the pressure stabilizing unit is connected to the inlet of the sampling unit. The pressure stabilizing unit is used to buffer and stabilize the pressure of the gas to be tested.

10. The gas detection system according to claim 1, characterized in that, The gas detection system also includes a monitoring unit, the inlet of which is connected to the outlet of the sampling unit, and the monitoring unit is used to monitor whether there is a target element in the gas to be tested flowing out of the sampling unit; Wherein, when the monitoring unit detects that there is a target element in the gas to be tested flowing out of the sampling unit, the air intake unit is configured to stop air intake, the sampling unit is configured to desorb the target element, and the detection unit is configured to detect the target element desorbed from the sampling unit.

11. The gas detection system according to claim 1, characterized in that, The gas detection system further includes a first gas driving unit, which is disposed between the outlet end of the inlet unit and the inlet end of the sampling unit. The first gas driving unit is used to accelerate gas flow. And / or, the gas detection system further includes a second gas driving unit, which is connected to the gas outlet of the detection unit and is used to accelerate gas flow.

12. The gas detection system according to claim 1, characterized in that, The gas detection system further includes a first inflation unit, the outlet of which is connected to the inlet unit. The first inflation unit is used to provide carrier gas to the inlet unit to deliver the gas to be tested. And / or, the gas detection system further includes a second inflation unit, the outlet of which is connected to the inlet of the sampling unit, and the second inflation unit is used to provide activation gas to the sampling unit.

13. The gas detection system according to claim 1, characterized in that, The gas detection system also includes a mounting plate, which includes at least two sub-plates, and the impurity removal unit, the sampling unit, and the detection unit are distributed on at least two of the sub-plates; Wherein, at least two of the sub-boards are spliced ​​together to form a single-layer structure, or at least two of the sub-boards are stacked to form a stacked structure.

14. The gas detection system according to claim 13, characterized in that, The gas detection system also includes a transition tube, the two ends of which extend to the two sub-plates respectively. The transition tube is detachably connected to the impurity removal unit, the sampling unit or the detection unit on the two sub-plates.

Images