Organic gas detector calibration equipment for testing leakage rate of iodine adsorber

Abstract

The invention relates to organic gas detector calibration equipment for testing the leakage rate of an iodine adsorber, which is characterized in that a gas inlet branch comprises a detection gas path and a diluent gas path, the detection gas path is connected with detected gas, and the diluent gas path is connected with inert gas; the gas mixer is connected with the gas inlet branch and is used for mixing the detected gas and the inert gas to obtain mixed gas with target concentration; the gas mixer is connected with the organic gas detector, and the organic gas detector is calibrated by the mixed gas. According to the invention, the purposes of accurate control based on the gas ratio, obtaining of a plurality of mixed gases with different gas concentrations, obtaining of a plurality of calibration points, more accurate calibration results, no need of storage of a plurality of gas cylinders and no need of cost increase are achieved, and the relationship between the calibration result accuracy and the storage cost is effectively balanced.

Description

Technical Field

[0001] The present invention relates to the technical field of nuclear air purification, and in particular to a calibration device for an organic gas detector used for testing the leakage rate of an iodine adsorber. Background Art

[0002] During the operation of nuclear facilities, radioactive gases will inevitably be generated. The radioactive gases generated by nuclear facilities are usually removed by a nuclear air purification system equipped with iodine adsorbers. Before the commissioning of nuclear facilities and during normal operation, in order to ensure the reliable operation of the nuclear air purification system, it is necessary to evaluate the effectiveness of the iodine adsorbers. One of the evaluation methods is to test the leakage rate of the iodine adsorbers.

[0003] An organic gas detector is selected to measure the leakage rate of the iodine adsorber. To ensure the measurement accuracy of the organic gas detector, the organic gas detector needs to be calibrated regularly.

[0004] In related technologies, when calibrating an organic gas detector, standard gases with concentrations of 20%, 50%, and 80% of the full scale of the detector are selected to calibrate the detector. However, during the process of testing the leakage rate of the iodine adsorber, the concentration of the target gas actually detected is quite different from the concentration of the standard gas. Only using the standard gas concentration to detect the accuracy of the organic gas detector cannot ensure the accuracy of the organic gas detector when measuring the actual concentration; if calibration gases with multiple concentrations are prepared to calibrate the organic gas detector, the more calibration points, the more accurate the concentration fitting curve, but more calibration gases with multiple concentrations need to be stored in multiple gas cylinders, which will increase the cost, and placing a large number of gas cylinders together poses a high safety hazard, and a large number of gas cylinders are not suitable for long-distance transportation.

[0005] During the calibration process of the organic gas detector for the leakage rate of the iodine adsorber, only a few calibration gases with different concentrations can be used, resulting in inaccurate calibration results. Using multiple calibration gases with different concentrations leads to high gas cylinder storage costs and difficult transportation, and there is a problem that it is impossible to effectively balance the calibration results and the cost of transportation.

[0006] The above problems need to be solved urgently. Summary of the Invention

[0007] The present invention discloses a calibration device for an organic gas detector used for testing the leakage rate of an iodine adsorber, aiming to solve the technical problems existing in the prior art.

[0008] The present invention adopts the following technical solutions:

[0009] On the one hand, the present invention provides a calibration device for an organic gas detector used in the leakage rate test of an iodine adsorber, which includes: an intake branch, including a detection gas path and a dilution gas path, the detection gas path is connected to the gas to be detected, and the dilution gas path is connected to an inert gas; a gas mixer, connected to the intake branch, mixing the gas to be detected and the inert gas to obtain a mixed gas with a target concentration; the gas mixer is connected to the organic gas detector, and the mixed gas calibrates the organic gas detector.

[0010] Optionally, the intake branch further includes: a first mass flowmeter, installed on the detection gas path, for detecting the first flow rate of the gas to be detected introduced into the gas mixer; a second mass flowmeter, installed on the dilution gas path, for detecting the second flow rate of the inert gas introduced into the gas mixer; a processor, connected to the first mass flowmeter and the second mass flowmeter, for receiving the first flow rate and the second flow rate, and determining the gas concentration of the mixed gas based on the first flow rate and the second flow rate.

[0011] Optionally, the intake branch further includes: a detection gas cylinder, connected to the end of the detection gas path, for supplying the gas to be detected; an inert gas cylinder, connected to the end of the dilution gas path, for supplying the inert gas.

[0012] Optionally, the gas mixer is in the shape of a gas tank, and a plurality of gas mixing channels are arranged inside the gas mixer, and the plurality of gas mixing channels are curved.

[0013] Optionally, it further includes: a calibration branch, connecting the gas mixer and the organic gas detector, the calibration branch includes a first solenoid valve and a processor; the first solenoid valve is installed between the gas mixer and the organic gas detector, for controlling the flow of the mixed gas; the processor is connected to the first solenoid valve, for controlling the opening and closing of the first solenoid valve.

[0014] Optionally, the calibration branch further includes: a device interface, installed between the first solenoid valve and the organic gas detector, and the organic gas detector is detachably connected to the device interface.

[0015] Optionally, the calibration branch further includes: a third mass flowmeter, installed between the first solenoid valve and the device interface, for detecting the third flow rate of the mixed gas introduced into the organic gas detector; the third mass flowmeter is connected to the processor, and the processor is used to receive the third flow rate and control the opening and closing of the first solenoid valve based on the third flow rate.

[0016] Optionally, the calibration branch further includes: a first standby carbon bed installed at the end of the calibration branch, and a gas adsorption material is placed in the first standby carbon bed.

[0017] Optionally, it further includes: an evacuation branch including a second solenoid valve and a second standby carbon bed. The second standby carbon bed is installed at the end of the evacuation branch, and the second solenoid valve is installed between the gas mixer and the second standby carbon bed; a gas adsorption material is placed in the second standby carbon bed; a processor is connected to the second solenoid valve and is configured to control the opening and closing of the second solenoid valve.

[0018] According to another aspect of the embodiments of the present invention, there is also provided an application method for an organic gas detector calibration device for iodine adsorber leakage rate testing, which is applied to any one of the organic gas detector calibration devices for iodine adsorber leakage rate testing, and includes: installing the organic gas detector at the device interface of the calibration branch, connecting the detection gas cylinder to the first mass flowmeter of the intake branch, and connecting the inert gas cylinder to the second mass flowmeter of the intake branch; the processor determines the gas concentration of the mixed gas based on the first flow rate obtained by the first mass flowmeter and the second flow rate obtained by the second mass flowmeter; the processor controls the second solenoid valve on the evacuation branch to open, and the mixed gas enters the second standby carbon bed; after reaching a preset time, the processor controls the second solenoid valve to close, controls the first solenoid valve on the calibration branch to open, and the organic gas detector starts; the third mass flowmeter on the calibration branch obtains the third flow rate on the calibration branch; when the third flow rate is lower than the preset flow rate, the processor controls the first solenoid valve to close, and the organic gas detector completes calibration to obtain a calibration result corresponding to the gas concentration of the mixed gas.

[0019] The technical solution adopted by the present invention can achieve at least one of the following beneficial effects:

[0020] In an embodiment of the present invention, an intake branch is provided, which includes a detection gas path and a dilution gas path. The detection gas path is connected to the gas to be detected, and the dilution gas path is connected to an inert gas. A gas mixer is connected to the intake branch to mix the gas to be detected and the inert gas to obtain a mixed gas. A calibration branch includes an organic gas detector, which is connected to the gas mixer to detect the calibration concentration of the mixed gas and obtain a calibration point. It achieves precise control based on gas ratio, can obtain mixed gases with multiple different gas concentrations, that is, can acquire multiple calibration points, the calibration result is more accurate, and at the same time, it does not require multiple gas cylinders for storage and does not increase costs. Thus, it realizes the technical effect of obtaining mixed gases with multiple different gas concentrations, improving the accuracy of the calibration result while reducing the gas cylinder storage cost and the transportation difficulty. Furthermore, it solves the technical problem that during the calibration process of the organic gas detector for the leakage rate of the iodine adsorber, only a few calibration gases with different concentrations can be used, resulting in inaccurate calibration results. Using multiple calibration gases with different concentrations leads to high gas cylinder storage costs and difficult transportation, and there is no effective balance between the calibration result and the cost of transportation. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly introduced below. These drawings form a part of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0022] Figure 1 FIG. 1 is a schematic structural diagram of an organic gas detector calibration device for testing the leakage rate of an iodine adsorber in Embodiment 1 of the present invention;

[0023] Figure 2 FIG. 2 is a flowchart of an application method of an organic gas detector calibration device for testing the leakage rate of an iodine adsorber in Embodiment 2 of the present invention.

[0024] Description of the reference numerals:

[0025] 1. Intake branch; 11. First mass flowmeter; 12. Second mass flowmeter; 13. Detection gas cylinder; 14. Inert gas cylinder.

[0026] 2. Gas mixer;

[0027] 3. Calibration branch; 31. Organic gas detector; 32. First solenoid valve; 33. Equipment interface; 34. Third mass flowmeter; 35. First backup carbon bed.

[0028] 4. Processor;

[0029] 5. Drainage branch; 51. Second solenoid valve; 52. Second standby carbon bed. Detailed implementation manners

[0030] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments of the present invention and the corresponding drawings. In the description of the present invention, it should be noted that the term "or" is generally used in the sense of including "and / or" unless otherwise clearly specified in the context.

[0031] In the description of the present invention, it should be noted that unless otherwise clearly specified and defined, the terms "installed", "connected" and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a magnetic connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of this application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three or more, etc., unless otherwise clearly and specifically defined.

[0032] Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0033] First, to facilitate the understanding of the embodiments of the present invention, some terms or nouns involved in the present invention will be explained below:

[0034] The leakage rate of the iodine adsorber refers to the ratio of the concentration of the tracer measured downstream of the activated carbon bed to the concentration of the tracer measured upstream.

[0035] An organic gas detector is an instrument specifically used to detect the concentration of volatile organic compounds (VOCs) in the environment. An organic gas detector usually adopts PID (photoionization detector) technology, and its working principle is to use an ultraviolet lamp (UV) light source to ionize organic molecules into positive and negative ions that can be detected by the detector (ionization). The detector captures the positive and negative charges of the ionized gas and converts them into an electrical signal, thereby realizing the measurement of the gas concentration.

[0036] To solve the problems existing in the prior art, the embodiments of the present application provide a calibration device for an organic gas detector used for testing the leakage rate of an iodine adsorber.

[0037] Example 1

[0038] This embodiment provides a calibration device for an organic gas detector used in the leakage rate test of an iodine adsorber, as Figure 1 shown Figure 1 FIG. 8 is a schematic structural diagram of a calibration device for an organic gas detector used in the leakage rate test of an iodine adsorber in Embodiment 1 of the present invention. The method includes:

[0039] An intake air branch 1, including a detection gas gas path and a dilution gas gas path. The detection gas gas path is connected to the gas to be detected, and the dilution gas gas path is connected to an inert gas; a gas mixer 2, connected to the intake air branch 1, mixes the gas to be detected and the inert gas to obtain a mixed gas with a target concentration; the gas mixer 2 is connected to an organic gas detector 31, and the mixed gas calibrates the organic gas detector 31.

[0040] Based on the above structure, the calibration device for the organic gas detector adopts the principle of diluting a high-concentration gas to be detected. Specifically, by adjusting the amount of the gas to be detected and the amount of the inert gas (nitrogen) used for dilution, and then fully mixing the two gases, finally a mixed gas required for calibration is obtained. Based on the above method, by adjusting the amount, a mixed gas concentration required arbitrarily can be obtained, that is, during the detection process of the organic gas detector 31, multiple calibration points can be determined. The number of calibration points required can be based on adjusting the proportion of the inert gas to the gas to be detected, so as to obtain multiple target concentrations.

[0041] Specifically, the intake air branch 1 of the calibration device for the organic gas detector 31 is composed of two gas paths (a detection gas gas path and a dilution gas gas path). It should be noted that the concentration of the gas to be detected required for the detection gas gas path should be higher than the concentration of the target gas to be detected subsequently. The dilution gas gas path is connected to an inert gas, and nitrogen is selected. Since the production cost of nitrogen is relatively low and nitrogen is relatively easy to obtain, nitrogen is selected as the inert gas in the dilution gas gas path.

[0042] Optionally, through the interaction of the above detection gas gas path and dilution gas gas path, mixed gases with various different concentrations can be obtained, achieving the effect of obtaining multiple calibration points and more accurate calibration effect. At the same time, it is not necessary to use multiple gas cylinders to transport the above gases, which can effectively reduce the transportation cost of the gas cylinders.

[0043] In some preferred embodiments, the intake branch 1 further includes: a first mass flowmeter 11, installed on the detected gas path, for detecting the first flow rate of the detected gas introduced into the gas mixer 2; a second mass flowmeter 12, installed on the dilution gas path, for detecting the second flow rate of the inert gas introduced into the gas mixer 2; a processor 4, connected to the first mass flowmeter 11 and the second mass flowmeter 12, for receiving the first flow rate and the second flow rate, and determining the gas concentration of the mixed gas based on the first flow rate and the second flow rate.

[0044] Based on the above structure, since the detected gas and the inert gas are introduced from different branches and the introduced amounts are different, it is necessary to set the first mass flowmeter 11 and the second mass flowmeter 12 to facilitate the determination of the target concentration of the mixed gas.

[0045] Specifically, the gas concentration of the mixed gas is calculated as follows:

[0046]

[0047] Where C is the gas concentration (target concentration) of the mixed gas, C1 is the gas concentration of the detected gas, Q1 is the first flow rate of the detected gas, and Q2 is the second flow rate of the inert gas.

[0048] Optionally, based on an organic gas detector 31 with a sampling flow rate of 400 ml / min, the gas concentration of the detected gas is 10 ppm, and taking the target gas concentrations required for calibration as 0.01 ppm, 0.1 ppm, and 1 ppm as examples, according to the gas concentration calculation formula of the mixed gas, when the first flow rate of the first mass flowmeter 11 reaches 0.6 ml / min and the second flow rate of the second mass flowmeter 12 reaches 600 ml / min, a mixed gas with a gas concentration of 0.01 ppm can be obtained; according to the gas concentration calculation formula of the mixed gas, when the first flow rate of the first mass flowmeter 11 reaches 6.06 ml / min and the second flow rate of the second mass flowmeter 12 reaches 600 ml / min, a mixed gas with a gas concentration of 0.1 ppm can be obtained; according to the gas concentration calculation formula of the mixed gas, when the first flow rate of the first mass flowmeter 11 reaches 100 ml / min and the second flow rate of the second mass flowmeter 12 reaches 900 ml / min, a mixed gas with a gas concentration of 1 ppm can be obtained.

[0049] It should be noted that the total flow rate of the gas to be detected and the inert gas (Q1 + Q2) is at least 1.5 times the gas sampling flow rate in the organic gas detector 31, that is, the total flow rate of the gas to be detected and the inert gas is higher than the sampling flow rate required during detection. Specifically, if the intake flow rate of the organic gas detector 31 is too low, it will affect its response time, measurement accuracy, and measurement stability, which is not conducive to the accuracy of the calibration result. Therefore, it is necessary to set the total flow rate of the gas to be detected and the inert gas to be higher than the sampling flow rate required during detection.

[0050] Optionally, both the first flow rate obtained by the first mass flowmeter 11 and the second flow rate obtained by the second mass flowmeter 12 need to be transmitted to the processor 4, and the processor 4 calculates based on the gas concentration calculation formula of the mixed gas. At the same time, the processor 4 can also control the first flow rate or the second flow rate to reach the preset value based on the preset gas concentration of the mixed gas (which needs to be input and set in advance), and then close the gas path through which the corresponding gas flows, so as to accurately control the gas concentration of the mixed gas.

[0051] In some preferred embodiments, the intake branch 1 further includes: a detection gas cylinder 13, connected to the end of the detection gas path, for supplying the gas to be detected; an inert gas cylinder 14, connected to the end of the dilution gas path, for supplying the inert gas.

[0052] Based on the above structure, the gas needs to be placed and stored in cylinders, and the intake branch 1 needs to be connected to the cylinders. The gas cylinders provide the gas to be detected and the inert gas to the intake branch 1. Since there are two gas paths in the intake branch 1 (the detection gas path and the dilution gas path), two gas cylinders (the detection gas cylinder 13 and the inert gas cylinder 14) need to be set. Based on the two gas cylinders, various mixed gases with different concentrations can be obtained, effectively reducing the number of gas cylinders, thereby reducing costs. At the same time, a small number of gas cylinders are convenient for transportation, solving the technical problems of high gas cylinder storage costs, difficult transportation, and the inability to effectively balance the calibration result and cost transportation caused by using multiple calibration gases with different concentrations.

[0053] In some preferred embodiments, the gas mixer 2 is in the shape of a gas tank, and a plurality of gas mixing channels are provided inside the gas mixer 2, and the plurality of gas mixing channels are curved.

[0054] Based on the above structure, the gas mixer 2 adopts the principle of static mixing. The internal gas mixing channels (air flow channels) are formed by partitioning with baffles to form channels. When the gas to be detected and the inert gas are introduced into the inlet of the gas mixer 2, the two gases start to mix, but the mixing is not uniform. Therefore, the mixed gas is passed through the curved gas mixing channels, and the air flow repeatedly folds and rotates, so that the mixed gas achieves the effect of uniform mixing, and finally the two gases are fully and uniformly mixed at the outlet end of the gas mixer 2.

[0055] In some preferred embodiments, it further includes a calibration branch 3, connecting the gas mixer 2 and the organic gas detector 31. The calibration branch 3 includes a first solenoid valve 32 and a processor 4. The first solenoid valve 32 is installed between the gas mixer 2 and the organic gas detector 31 for controlling the flow of the mixed gas. The processor 4 is connected to the first solenoid valve 32 for controlling the opening and closing of the first solenoid valve 32.

[0056] Based on the above structure, a first solenoid valve 32 is provided on the calibration branch 3 connecting the gas mixer 2 and the organic gas detector 31. During the gas mixing process, the mixed gas initially input into the calibration branch 3 may not be fully mixed, so some gases are unusable gases, which may lead to inaccurate calibration results. Therefore, before starting the calibration, the first solenoid valve 32 is first closed to release a part of the initially mixed gas. After the air flow is stable and evenly mixed, the first solenoid valve 32 is then opened, and the mixed gas enters the organic gas detector 31, thereby starting the calibration and improving the accuracy of the calibration result.

[0057] In some preferred embodiments, the calibration branch 3 further includes: a device interface 33, installed between the first solenoid valve 32 and the organic gas detector 31, and the organic gas detector 31 is detachably connected to the device interface 33.

[0058] Based on the above structure, the models of the organic gas detectors 31 are not the same. Different models can detect different gases to be detected. That is, the organic gas detector A can detect the hydrogen concentration and the carbon dioxide gas concentration, and the organic gas detector B can detect the methane gas concentration. During the detection of multiple different gases, by setting the device interface 33, the same organic gas detector calibration device can be connected to different organic gas detectors 31, effectively reducing the equipment cost, making the equipment more flexible to use and having a wider range of applications.

[0059] In some preferred embodiments, the calibration branch 3 further includes: a third mass flowmeter 34, installed between the first solenoid valve 32 and the device interface 33 for detecting the third flow rate of the mixed gas flowing into the organic gas detector 31. The third mass flowmeter 34 is connected to the processor 4, and the processor 4 is used to receive the third flow rate.

[0060] Based on the above structure, before the mixed gas flows into the organic gas detector 31, to ensure that the third flow rate is controllable and the data is retained, a third mass flowmeter 34 can be installed between the first solenoid valve 32 and the device interface 33, so that the third flow rate can be obtained in real time.

[0061] In some preferred embodiments, the calibration branch 3 further includes: a first backup carbon bed 35, installed at the end of the calibration branch 3, and a gas adsorption material is placed in the first backup carbon bed 35.

[0062] Based on the above structure, when the first solenoid valve 32 is opened and the mixed gas is introduced into the organic gas detector 31, it is ionized into positive ions and free electrons. After the detection is completed, the positive ions and electrons recombine to restore the original organic gas, realizing non-destructive detection of the gas. In the discharged mixed gas, it may pollute the atmosphere or endanger the health of the staff, so it needs to be recycled. Therefore, a first backup carbon bed 35 is set up to effectively absorb the mixed gas after the detection and prevent it from being discharged into the environment without treatment.

[0063] Optionally, a gas adsorption material is placed in the first backup carbon bed 35. The gas adsorption material is placed according to the substances in the actually detected mixed gas, and any material that can absorb the mixed gas is acceptable. In the relevant experiments on the leakage rate of the iodine adsorber, 10 cm thick coconut shell activated carbon can be placed in the first backup carbon bed 35 to effectively absorb iodine elements and ensure that the detected gas is filtered and discharged to ensure the safety of the staff.

[0064] In some preferred embodiments, it further includes: an evacuation branch 5, including a second solenoid valve 51 and a second backup carbon bed 52. The second backup carbon bed 52 is installed at the end of the evacuation branch 5, and the second solenoid valve 51 is installed between the gas mixer 2 and the second backup carbon bed 52; a gas adsorption material is placed in the second backup carbon bed 52; a processor 4, connected to the second solenoid valve 51, is used to control the opening and closing of the second solenoid valve 51.

[0065] Based on the above structure, at the initial stage of the preparation of the mixed gas, there may be some incompletely mixed gas, and the concentration does not meet the required concentration at this time. Therefore, the evacuation branch 5 is set up to discharge the mixed gas that does not meet the concentration requirements and the remaining gas during equipment calibration. After the two gases are mixed by the gas mixer 2, first open the second solenoid valve 51 to introduce them into the evacuation branch 5, absorb them through the second backup carbon bed 52, wait for 5 - 10 seconds, then close the second solenoid valve 51, open the first solenoid valve 32 of the calibration branch 3, and set the third flow rate of the third mass flowmeter 34 to the sampling flow rate of the organic gas detector 31, then the organic gas detector 31 can be calibrated with the mixed gas of the target concentration.

[0066] Optionally, in the relevant experiments on the leakage rate of the iodine adsorber, 10 cm thick coconut shell activated carbon can be placed in the second backup carbon bed 52 to ensure that the detected gas is filtered and discharged to ensure the safety of the staff.

[0067] In addition, when the data of the organic gas detector 31 has been collected, but there is still some remaining gas in the gas mixer 2, the remaining mixed gas can be discharged into the evacuation branch 5, so that the detection of the next different gas can be carried out.

[0068] Based on the above structure, the calibration device for the organic gas detector can stably, accurately and continuously supply mixed gases with different concentrations, realizing convenient and safe multi-concentration calibration of the organic gas detector 31, thus greatly improving the measurement accuracy of the organic gas detector 31. At the same time, it ensures the safety of personnel and equipment during the calibration process, reduces the cost of using gas cylinders, and enables long-distance transportation.

[0069] Embodiment 2

[0070] Based on the above embodiments and optional embodiments, the present invention further proposes an application method for a calibration device for an organic gas detector used for testing the leakage rate of an iodine adsorber. Figure 2 It is a flowchart of an application method for a calibration device for an organic gas detector used for testing the leakage rate of an iodine adsorber in Embodiment 2 of the present invention. As Figure 2 shown, the method includes:

[0071] Step S1: Install the organic gas detector 31 at the device interface 33 of the calibration branch 3. Connect the gas detection gas cylinder 13 to the first mass flowmeter 11 of the intake branch 1, and connect the inert gas cylinder 14 to the second mass flowmeter 12 of the intake branch 1.

[0072] Step S2: The processor 4 determines the gas concentration of the mixed gas based on the first flow rate obtained by the first mass flowmeter 11 and the second flow rate obtained by the second mass flowmeter 12.

[0073] Step S3: The processor 4 controls the second solenoid valve 51 on the evacuation branch 5 to open, and the mixed gas enters the second standby carbon bed 52.

[0074] Step S4: After reaching the preset time, the processor 4 controls the second solenoid valve 51 to close, and controls the first solenoid valve 32 on the calibration branch 3 to open, and the organic gas detector 31 starts.

[0075] Step S5: The third mass flowmeter 34 on the calibration branch 3 obtains the third flow rate on the calibration branch 3.

[0076] Step S6: When the third flow rate is lower than the preset flow rate, the processor 4 controls the first solenoid valve 32 to close, and the organic gas detector 31 completes the calibration, and obtains the calibration result corresponding to the gas concentration of the mixed gas.

[0077] Through the above steps S1 to S6, precise control based on gas ratio is achieved, and mixed gases with multiple different gas concentrations can be obtained, that is, multiple calibration points can be acquired, the calibration result is more accurate, and at the same time, multiple gas cylinders for storage are not required, achieving the purpose of not increasing costs; thus, the technical effect of obtaining mixed gases with multiple different gas concentrations, improving the accuracy of calibration results, reducing the gas cylinder storage cost, and reducing the transportation difficulty is realized; furthermore, the technical problem that during the calibration process of the organic gas detector 31 for the leakage rate of the iodine adsorber, only a few calibration gases with different concentrations can be used, resulting in inaccurate calibration results, and using multiple calibration gases with different concentrations leads to high gas cylinder storage costs and difficult transportation, and there is no effective balance between calibration results and cost transportation is solved.

[0078] The above is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. An organic gas detector calibration device for iodine adsorber leakage rate testing, characterized in that: include: An air intake branch (1) comprises a detection gas path and a dilution gas path, wherein the detection gas path is connected to the detected gas, and the dilution gas path is connected to the inert gas; A gas mixer (2) connected to the air inlet branch (1) for mixing the detected gas and the inert gas to obtain a mixed gas of a target concentration; The gas mixer (2) is connected to an organic gas detector (31), and the mixed gas is used to calibrate the organic gas detector (31).

2. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 1, characterized in that: The air intake branch (1) further comprises: A first mass flow meter (11), installed on the detection gas path, for detecting a first flow rate of the detected gas entering the gas mixer (2); a second mass flow meter (12), installed on the dilution gas path, for detecting a second flow rate of the inert gas entering the gas mixer (2); A processor (4) is connected to the first mass flow meter (11) and the second mass flow meter (12), and is used to receive the first flow rate and the second flow rate, and determine the gas concentration of the mixed gas based on the first flow rate and the second flow rate.

3. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 1, characterized in that: The air intake branch (1) further comprises: A detection gas cylinder (13), connected to the end of the detection gas circuit, and supplying the detected gas; An inert gas cylinder (14) is connected to the end of the dilution gas circuit to supply the inert gas.

4. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 1, characterized in that: The gas mixer (2) is in the shape of a gas tank, and a plurality of gas mixing channels are arranged inside the gas mixer (2), and the plurality of gas mixing channels are in a curved shape.

5. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 1, characterized in that: Also includes: A calibration branch (3) connecting the gas mixer (2) and the organic gas detector (31), wherein the calibration branch (3) comprises a first solenoid valve (32) and a processor (4); The first solenoid valve (32) is installed between the gas mixer (2) and the organic gas detector (31) and is used to control the circulation of the mixed gas; The processor (4) is connected to the first solenoid valve (32) and is used to control the opening and closing of the first solenoid valve (32).

6. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 5, characterized in that: The calibration branch (3) further comprises: The device interface (33) is installed between the first solenoid valve (32) and the organic gas detector (31), and the organic gas detector (31) and the device interface (33) are detachably connected.

7. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 6, characterized in that: The calibration branch (3) further comprises: a third mass flow meter (34), installed between the first solenoid valve (32) and the device interface (33), and used for detecting a third flow rate of the mixed gas passing into the organic gas detector (31); The third mass flow meter (34) is connected to the processor (4), and the processor (4) is used to receive the third flow rate and control the opening and closing of the first solenoid valve (32) based on the third flow rate.

8. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 5, characterized in that: The calibration branch (3) further comprises: The first backup carbon bed (35) is installed at the end of the calibration branch (3), and a gas adsorption material is placed in the first backup carbon bed (35).

9. The organic gas detector calibration device for iodine adsorber leakage rate testing according to claim 1, characterized in that: Also includes: An exhaust branch (5) comprising a second solenoid valve (51) and a second backup carbon bed (52), wherein the second backup carbon bed (52) is installed at the end of the exhaust branch (5), and the second solenoid valve (51) is installed between the gas mixer (2) and the second backup carbon bed (52); A gas adsorbent material is placed in the second backup carbon bed (52); The processor (4) is connected to the second solenoid valve (51) and is used to control the opening and closing of the second solenoid valve (51).

10. An application method of an organic gas detector calibration device for iodine adsorber leakage rate test, applied to an organic gas detector calibration device for iodine adsorber leakage rate test according to any one of claims 1 to 9, characterized in that: include: The organic gas detector (31) is installed at the device interface (33) of the calibration branch (3), the detection gas cylinder (13) is connected to the first mass flow meter (11) of the intake branch (1), and the inert gas cylinder (14) is connected to the second mass flow meter (12) of the intake branch (1); The processor (4) determines the gas concentration of the mixed gas based on the first flow rate obtained by the first mass flow meter (11) and the second flow rate obtained by the second mass flow meter (12); The processor (4) controls the second solenoid valve (51) on the exhaust branch (5) to open, and the mixed gas enters the second reserve carbon bed (52); After the preset time is reached, the processor (4) controls the second solenoid valve (51) to close, controls the first solenoid valve (32) on the calibration branch (3) to open, and the organic gas detector (31) is started; The third mass flow meter (34) on the calibration branch (3) obtains a third flow on the calibration branch (3); When the third flow rate is lower than a preset flow rate, the processor (4) controls the first solenoid valve (32) to close, and the organic gas detector (31) completes calibration to obtain a calibration result corresponding to the gas concentration of the mixed gas.

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