Non-methane total hydrocarbon dilution detection device and detection method thereof

Abstract

The invention discloses a non-methane total hydrocarbon dilution detection device and a detection method thereof, and relates to the technical field of waste gas detection, the non-methane total hydrocarbon dilution detection device comprises a sampling pipeline, a return pipeline, a diverter valve, a collection pump, an air pipeline, a mixing pipeline, an electromagnetic multi-way valve and a hydrogen flame ionization detector. The electromagnetic multi-way valve is connected with the gas storage valve, a first sensor and a second sensor in the gas storage valve are in communication connection with the electromagnetic multi-way valve, the remaining mixed gas can be temporarily stored in the gas storage valve, and the full or insufficient state of the mixed gas in the gas storage valve is detected through the first sensor and the second sensor. The mixed gas can keep a certain pressure under the compression of the floating pressure control module by the self weight, so that the mixed gas can be pushed to flow back and enter the flame ionization detector for detection, and the problems that in the prior art, the mixed gas allowed to enter the FID detector is limited, the redundant mixed gas cannot be utilized, and the detection efficiency is low are solved. And the energy utilization rate is low.

Description

Technical Field

[0001] The present invention relates to the technical field of waste gas detection, and in particular to a non-methane total hydrocarbon dilution detection device and a detection method thereof. Background Art

[0002] Non-methane hydrocarbons are gaseous or liquid at room temperature and are highly volatile, which can pollute the environment. Therefore, non-methane hydrocarbon detection is a necessary environmental monitoring measure.

[0003] When testing non-methane total hydrocarbons, the waste gas is sucked by a large flow collection pump (about 7L / min) to produce a higher flow rate of the waste gas, of which most of the waste gas (about 6.65L / min) is discharged back to the waste gas pipeline through the return pipeline. Then, the remaining waste gas (about 0.35L / mi) is mixed with compressed air (about 3.15L / min) as a dilution gas and flows into the hydrogen flame ionization detector (i.e. FID detector) for detection.

[0004] The FID detector generally only allows the mixed gas to enter at a flow rate of tens of milliliters per minute. Therefore, the excess mixed gas is basically discharged or discharged back into the exhaust gas pipeline for treatment (refer to the online dilution monitoring device for total hydrocarbons in exhaust gas disclosed in CN107024377B, or the non-methane total hydrocarbon detection device and method based on dilution technology disclosed in CN117147671A).

[0005] The existing technology does not utilize the excess mixed gas, so the large-flow collection pump and the motor of the compressed air must work continuously, and the energy utilization rate is low. Summary of the invention

[0006] One of the purposes of the present invention is to improve the problem in the prior art that the mixed gas allowed to enter the FID detector is limited and the excess mixed gas cannot be utilized, resulting in low energy utilization.

[0007] A second object of the present invention is to provide a non-methane total hydrocarbon dilution detection method.

[0008] To achieve one of the above purposes, the present invention adopts the following technical scheme: a non-methane total hydrocarbon dilution detection device, including a sampling pipeline, a reflux pipeline, a diverter valve, a collection pump, an air pipeline, a mixing pipeline, an electromagnetic multi-way valve and a hydrogen flame ionization detector, wherein the collection pump is arranged on the sampling pipeline, and the sampling pipeline is connected to the reflux pipeline through the diverter valve.

[0009] The sampling pipeline, the air pipeline and the mixing pipeline are respectively connected to the electromagnetic multi-way valve, and the mixing pipeline is communicated with the hydrogen flame ionization detector.

[0010] The electromagnetic multi-way valve is also connected to an air storage valve, which includes an air hole and an air storage cavity. The air hole connects the electromagnetic multi-way valve and the air storage cavity. A floating pressure control module is slidably arranged in the air storage cavity. A first sensor is arranged at the lower end of the air storage cavity, and a second sensor is arranged at the upper end of the air storage cavity. The first sensor and the second sensor are communicatively connected to the electromagnetic multi-way valve.

[0011] A magnetorheological fluid cavity is arranged above the gas storage cavity, a damping plug is slidably arranged in the magnetorheological fluid cavity, the damping plug is connected to the floating pressure control module through a rod body, and an electromagnet ring is arranged at the side end of the damping plug.

[0012] In the above technical solution, when the embodiment of the present invention is used, the collection pump sucks the exhaust gas to the diverter valve in the sampling pipeline, part of the exhaust gas flows to the return pipeline, and the remaining exhaust gas enters the electromagnetic multi-way valve, and is mixed with the air in the air pipeline as the dilution gas in the electromagnetic multi-way valve to dilute the volume concentration of non-methane total hydrocarbons in the exhaust gas. Then, part of the mixed gas enters the hydrogen flame ionization detector for detection. The remaining mixed gas enters the gas storage valve for temporary storage.

[0013] The mixed gas enters the gas storage chamber from the air hole of the gas storage valve to push the floating pressure control module upward. Then, when the second sensor detects the floating pressure control module, the electromagnetic multi-way valve is controlled to close the sampling pipeline and the air pipeline. At this time, the floating pressure control module compresses the mixed gas in the gas storage chamber to flow back to the electromagnetic multi-way valve, so that the mixed gas enters the hydrogen flame ionization detector (FID detector) for detection. Then, when the first sensor detects the floating pressure control module, the electromagnetic multi-way valve is controlled to open the sampling pipeline and the air pipeline.

[0014] The beneficial effects of the present invention are: First, the remaining mixed gas can be temporarily stored in the gas storage valve, and the fullness or lack thereof of the mixed gas in the gas storage valve can be detected by the first sensor and the second sensor. Under the pressure of the floating pressure control module with its own weight, the remaining mixed gas can maintain a certain pressure, which helps to promote the reflux of the remaining mixed gas and enter the hydrogen flame ionization detector for detection, thereby improving the problem in the prior art that the amount of mixed gas allowed to enter the FID detector is limited and the excess mixed gas cannot be utilized, resulting in low energy utilization.

[0015] Second, the floating pressure control module is connected to the damping plug in the magnetorheological fluid chamber. When the electromagnet ring at the side of the damping plug is energized to generate a magnetic field, the magnetorheological fluid between the electromagnet ring and the wall of the magnetorheological fluid chamber will undergo a rheological effect to form a plastic Bingham fluid. At this time, the mixed gas needs a greater pressure to push the floating pressure control module because the resistance to the floating pressure control module moving upward becomes greater. It can adapt to changes in the pressure of the mixed gas, and can utilize the remaining mixed gas of different pressures to improve the problem of low energy utilization.

[0016] It should be noted that because the collection pump of the sampling pipeline has different requirements from the air pump below the air pipeline, or the pipe diameters of the pipelines used are different, even if the same equipment is used, the pressure of the mixed gas may be different, and there is no accurate standard. Therefore, a gas storage structure that can adapt to the changes in the pressure of the mixed gas is needed.

[0017] Furthermore, in an embodiment of the present invention, the air storage chamber and the magnetorheological fluid chamber are separated by a partition plate.

[0018] Furthermore, in an embodiment of the present invention, the non-methane total hydrocarbon dilution detection device further includes a hydrogen pipeline, and the hydrogen pipeline is communicated with the hydrogen flame ionization detector.

[0019] Furthermore, in an embodiment of the present invention, the hydrogen pipeline is connected to a hydrogen cylinder, and a first flow meter is provided on the hydrogen pipeline.

[0020] Furthermore, in an embodiment of the present invention, the air pipeline is connected to an air pump, and a second flow meter is provided on the air pipeline.

[0021] Furthermore, in an embodiment of the present invention, an air filter is provided on the air pipeline.

[0022] Furthermore, in an embodiment of the present invention, a third flow meter is provided on the mixing pipeline.

[0023] Furthermore, in an embodiment of the present invention, a fourth flow meter is provided on the return pipeline.

[0024] In order to achieve the second of the above-mentioned objectives, the present invention adopts the following technical scheme: a non-methane total hydrocarbon dilution detection method, the non-methane total hydrocarbon dilution detection method is based on the non-methane total hydrocarbon dilution detection device described in one of the above-mentioned invention objectives, and the non-methane total hydrocarbon dilution detection method comprises the following steps: (S1) The collection pump draws the exhaust gas into the sampling pipeline, and then enters the diverter valve. Part of the exhaust gas enters the return pipeline, and the remaining exhaust gas enters the electromagnetic multi-way valve. At the same time, the external air is compressed and enters the electromagnetic multi-way valve through the air pipe to mix with the exhaust gas to dilute the volume concentration of non-methane total hydrocarbons in the exhaust gas.

[0025] (S2) Part of the mixed gas passes through a mixing pipe and enters a hydrogen flame ionization detector for detection.

[0026] (S3) The remaining mixed gas enters the gas storage chamber from the air hole of the gas storage valve to push the floating pressure control module upward. When the second sensor detects the floating pressure control module, the electromagnetic multi-way valve is controlled to close the sampling pipeline and the air pipeline, and the collection pump stops working.

[0027] (S4) At this time, the floating pressure control module compresses the mixed gas in the gas storage chamber to flow back to the electromagnetic multi-way valve, so that the mixed gas enters the hydrogen flame ionization detector for detection.

[0028] When the first sensor detects the floating pressure control module, the electromagnetic multi-way valve is controlled to open the sampling pipeline and the air pipeline, and the sampling pump works again, and the above steps S1, S2 and S3 are repeated.

[0029] Furthermore, in an embodiment of the present invention, in the above steps, when the pressure of the mixed gas in the gas storage valve is adjusted, the electromagnet ring of the damping plug is energized to generate a magnetic field, so that the magnetorheological fluid between the electromagnet ring and the wall of the magnetorheological fluid chamber undergoes a rheological effect to form a plastic Bingham fluid, thereby changing the resistance to the upward movement of the floating pressure control module.

[0030] It should be noted that because the collection pump of the sampling pipeline has different requirements from the air pump below the air pipeline, or the pipe diameters of the pipelines used are different, even if the same equipment is used, the pressure of the mixed gas may be different, and there is no accurate standard. Therefore, a gas storage structure that can adapt to the changes in the pressure of the mixed gas is needed. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 Schematic diagram of the gas circuit connection of the non-methane total hydrocarbon dilution detection device according to an embodiment of the present invention.

[0032] Figure 2 It is a schematic structural diagram of a gas storage valve according to an embodiment of the present invention.

[0033] Figure 3 Schematic diagram of another structure of the gas storage valve according to an embodiment of the present invention.

[0034] 1. Sampling pipeline, 2. Reflux pipeline, 3. Diverter valve, 4. Collection pump, 5. Air pipeline, 6. Mixing pipeline, 7. Hydrogen flame ionization detector, 8. Electromagnetic multi-way valve, 9. Gas storage valve, 10. Hydrogen pipeline, 11. Hydrogen cylinder, 12. First flow meter, 13. Air pump, 14. Second flow meter, 15. Air filter, 16. Third flow meter, 17. Fourth flow meter; 9.1. air hole, 9.2. air storage cavity, 9.3. floating pressure control module, 9.4. first sensor, 9.5. second sensor, 9.6. partition plate, 9.7. damping plug, 9.8. electromagnet ring. DETAILED DESCRIPTION

[0035] In order to make the purpose and technical solution of the present invention clearly and completely described, and the advantages more clearly understood, the embodiments of the present invention are further described in detail with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are part of the embodiments of the present invention, rather than all of the embodiments, and are only used to explain the embodiments of the present invention, and are not used to limit the embodiments of the present invention. All other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] In the description of the present invention, it should be noted that the terms "center", "middle", "upper", "lower", "left", "right", "inner", "outer", "top", "bottom", "side", "vertical", "horizontal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "one", "first", "second", "third", "fourth", "fifth", "sixth" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] For the purpose of simplicity and explanation, the principles of the embodiments are mainly described by reference to examples. In the following description, many specific details are presented to provide a thorough understanding of the embodiments. However, it is obvious that for ordinary technicians in this field, these embodiments may not be limited to these specific details in practice. In some instances, the known non-methane total hydrocarbon dilution detection methods and structures are not described in detail to avoid making these embodiments unnecessarily difficult to understand. In addition, all embodiments can be used in combination with each other. Example 1

[0039] It should be noted that the drawings in the specification are the contents of the specification. The structural shapes, connection relationships, matching relationships, and positional relationships that can be obtained without any doubt in the drawings in the specification should be understood as the contents of the specification.

[0040] A non-methane total hydrocarbon dilution detection device, such as Figure 1As shown, it includes a sampling pipeline 1, a reflux pipeline 2, a diverter valve 3, a collection pump 4, an air pipeline 5, a mixing pipeline 6, an electromagnetic multi-way valve 8 and a hydrogen flame ionization detector 7 (i.e., a FID detector). The collection pump 4 is arranged on the sampling pipeline 1, and the sampling pipeline 1 is connected to the reflux pipeline 2 through the diverter valve 3.

[0041] Specifically, the electromagnetic multi-way valve 8 is a conventional electromagnetically controlled five-way valve.

[0042] The sampling pipeline 1 , the air pipeline 5 and the mixing pipeline 6 are respectively connected to the electromagnetic multi-way valve 8 , and the mixing pipeline 6 is connected to the hydrogen flame ionization detector 7 .

[0043] like Figure 2 As shown, the electromagnetic multi-way valve 8 is also connected to the air storage valve 9, and the air storage valve 9 includes an air hole 9.1 and an air storage cavity 9.2. The air hole 9.1 connects the electromagnetic multi-way valve 8 and the air storage cavity 9.2. A floating pressure control module 9.3 is slidably arranged in the air storage cavity 9.2. A first sensor 9.4 is arranged at the lower end of the air storage cavity 9.2, and a second sensor 9.5 is arranged at the upper end of the air storage cavity 9.2. The first sensor 9.4 and the second sensor 9.5 are communicatively connected to the electromagnetic multi-way valve 8.

[0044] like Figure 3 As shown, a magnetorheological fluid cavity is provided above the air storage cavity 9.2, a damping plug 9.7 is slidably provided in the magnetorheological fluid cavity, the damping plug 9.7 is connected to the floating pressure control module 9.3 through a rod body, and an electromagnet ring 9.8 is provided at the side end of the damping plug 9.7.

[0045] The magnetorheological fluid cavity is filled with magnetorheological fluid. It should be noted that magnetorheological fluid is a new type of fluid with controllable fluidity, and is a relatively active research field in smart materials. When there is no external magnetic field, it exhibits the characteristics of a low-viscosity Newtonian fluid. When an external magnetic field is applied, it exhibits a high-viscosity, low-fluidity Bingham fluid. There is a corresponding relationship between the viscosity of the liquid and the magnetic flux, that is, the viscosity of the liquid is related to the current.

[0046] Implementation method: The collection pump 4 draws the waste gas to the diverter valve 3 in the sampling pipeline 1, part of the waste gas flows to the return pipeline 2, and the remaining waste gas enters the electromagnetic multi-way valve 8, and is mixed with the air in the air pipeline as the dilution gas in the electromagnetic multi-way valve 8 to dilute the volume concentration of non-methane total hydrocarbons in the waste gas. Then, part of the mixed gas enters the hydrogen flame ionization detector 7 for detection. The remaining mixed gas enters the gas storage valve 9 for temporary storage.

[0047] The mixed gas enters the gas storage chamber 9.2 from the air hole 9.1 of the gas storage valve 9 to push the floating pressure control module 9.3 upward. Then, when the second sensor 9.5 detects the floating pressure control module 9.3 (the mixed gas in the gas storage chamber 9.2 is full), the electromagnetic multi-way valve 8 is controlled to close the sampling pipeline 1 and the air pipeline 5 (which also means that the collection pump 4 and the air pump 13 of the air pipeline 5 described below do not need to work). At this time, the floating pressure control module 9.3 compresses the mixed gas in the gas storage chamber 9.2 to flow back to the electromagnetic multi-way valve 8, so that the mixed gas enters the hydrogen flame ionization detector 7 (FID detector) for detection. Then, when the first sensor 9.4 detects the floating pressure control module 9.3 (the mixed gas in the gas storage chamber 9.2 is lacking), the electromagnetic multi-way valve 8 is controlled to open the sampling pipeline 1 and the air pipeline 5.

[0048] One of the advantages of the present invention is that the remaining mixed gas can be temporarily stored in the gas storage valve 9, and the fullness or lack thereof of the mixed gas in the gas storage valve 9 can be detected by the first sensor 9.4 and the second sensor 9.5. Moreover, under the pressure of the floating pressure control module 9.3 with its own weight, the remaining mixed gas can maintain a certain pressure, which helps to promote the reflux of the remaining mixed gas and enter the hydrogen flame ionization detector 7 for detection, thereby improving the problem in the prior art that the amount of mixed gas allowed to enter the FID detector is limited and the excess mixed gas cannot be utilized, resulting in low energy utilization.

[0049] The second advantage of the present invention is that the floating pressure control module 9.3 is connected to the damping plug 9.7 in the magnetorheological fluid chamber. When the electromagnet ring 9.8 at the side end of the damping plug 9.7 is energized to generate a magnetic field, the magnetorheological fluid between the electromagnet ring 9.8 and the wall of the magnetorheological fluid chamber will have a rheological effect to form a plastic Bingham fluid. At this time, the mixed gas needs a greater pressure to push the floating pressure control module 9.3 because the resistance to the floating pressure control module 9.3 moving upward becomes larger. It can adapt to the change of the mixed gas pressure, can utilize the residual mixed gas of different pressures, and improve the problem of low energy utilization.

[0050] It should be noted that, because the collection pump 4 of the sampling pipeline 1 and the air pump 13 below the air pipeline 5 have different requirements, or the pipe diameters of the pipelines used are different, even if the equipment is the same, the pressure of the mixed gas may be different, and there is no accurate standard. Therefore, a gas storage structure that can adapt to the changes in the pressure of the mixed gas is needed.

[0051] Specifically, Figure 3 As shown, the air storage chamber 9.2 is separated from the magnetorheological fluid chamber by a partition plate 9.6.

[0052] Specifically, Figure 1 As shown, the non-methane total hydrocarbon dilution detection device also includes a hydrogen pipeline 10 , and the hydrogen pipeline 10 is communicated with the hydrogen flame ionization detector 7 .

[0053] More specifically, if Figure 1 As shown, the hydrogen pipeline 10 is connected to the hydrogen bottle 11 , and a first flow meter 12 is arranged on the hydrogen pipeline 10 .

[0054] Specifically, Figure 1 As shown, the air pipeline 5 is connected to the air pump 13 , and a second flow meter 14 is arranged on the air pipeline 5 .

[0055] More specifically, if Figure 1 As shown, an air filter 15 is arranged on the air pipeline 5 .

[0056] Specifically, Figure 1 As shown, a third flow meter 16 is provided on the mixing pipeline 6 and a fourth flow meter 17 is provided on the return pipeline 2. Example 2

[0057] A non-methane total hydrocarbon dilution detection method is provided. The non-methane total hydrocarbon dilution detection method is based on the non-methane total hydrocarbon dilution detection device in the above-mentioned embodiment 1. The non-methane total hydrocarbon dilution detection method comprises the following steps: (S1) The collection pump 4 draws the exhaust gas into the sampling pipeline 1, and then enters the diverter valve 3. Part of the exhaust gas enters the return pipeline 2, and the remaining exhaust gas enters the electromagnetic multi-way valve 8. At the same time, the external air is compressed and enters the electromagnetic multi-way valve 8 through the air pipe to mix with the exhaust gas to dilute the volume concentration of non-methane total hydrocarbons in the exhaust gas.

[0058] (S2) The mixed part of the gas enters the hydrogen flame ionization detector 7 through the mixing pipe for detection.

[0059] (S3) The remaining mixed gas enters the gas storage chamber 9.2 from the air hole 9.1 of the gas storage valve 9 to push the floating pressure control module 9.3 upward. When the second sensor 9.5 detects the floating pressure control module 9.3, the electromagnetic multi-way valve 8 is controlled to close the sampling pipeline 1 and the air pipeline 5, and the collection pump 4 stops working.

[0060] (S4) At this time, the floating pressure control module 9.3 compresses the mixed gas in the gas storage chamber 9.2 to flow back to the electromagnetic multi-way valve 8, so that the mixed gas enters the hydrogen flame ionization detector 7 for detection.

[0061] When the first sensor 9.4 detects the floating pressure control module 9.3, the electromagnetic multi-way valve 8 is controlled to open the sampling pipeline 1 and the air pipeline 5, and the sampling pump 4 works again, and the above steps S1, S2 and S3 are repeated.

[0062] The residual mixed gas of the present invention can be temporarily stored in the gas storage valve 9, and under the pressure of the floating pressure control module 9.3 with its own weight, the residual mixed gas can maintain a certain pressure, which helps to promote the residual mixed gas to flow back and enter the hydrogen flame ionization detector 7 for detection, thereby improving the problem of low energy utilization rate caused by the limited mixed gas allowed to enter the FID detector in the prior art and the inability to utilize the excess mixed gas.

[0063] Specifically, in the above steps, when the air pipeline 5 is closed, the air pump 13 stops working.

[0064] Specifically, in the above steps, when the pressure of the mixed gas in the gas storage valve 9 is regulated, the electromagnet ring 9.8 of the damping plug 9.7 is energized to generate a magnetic field, so that the magnetorheological fluid between the electromagnet ring 9.8 and the wall of the magnetorheological fluid cavity has a rheological effect, forming a plastic Bingham fluid to change the resistance of the floating pressure control module 9.3 to move upward. At this time, the mixed gas pushes the floating pressure control module 9.3. A greater pressure is required because the resistance of the floating pressure control module 9.3 to move upward becomes larger. It can adapt to the change of the mixed gas pressure, can utilize the residual mixed gas of different pressures, and improve the problem of low energy utilization.

[0065] It should be noted that, because the collection pump 4 of the sampling pipeline 1 and the air pump 13 below the air pipeline 5 have different requirements, or the pipe diameters of the pipelines used are different, even if the equipment is the same, the pressure of the mixed gas may be different, and there is no accurate standard. Therefore, a gas storage structure that can adapt to the changes in the pressure of the mixed gas is needed.

[0066] Although the above describes the illustrative specific embodiments of the present invention so that those skilled in the art can understand the present invention, the present invention is not limited to the scope of the specific embodiments. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, all inventions and creations using the concepts of the present invention are protected.

Claims

1. A non-methane total hydrocarbon dilution detection device, comprising a sampling pipeline, a reflux pipeline, a diverter valve, a collection pump, an air pipeline, a mixing pipeline, an electromagnetic multi-way valve and a hydrogen flame ionization detector, wherein the collection pump is arranged on the sampling pipeline, and the sampling pipeline is connected to the reflux pipeline through the diverter valve; The sampling pipeline, the air pipeline and the mixing pipeline are respectively connected to the electromagnetic multi-way valve, and the mixing pipeline is connected to the hydrogen flame ionization detector; It is characterized in that The electromagnetic multi-way valve is also connected to an air storage valve, the air storage valve comprises an air hole and an air storage cavity, the air hole communicates with the electromagnetic multi-way valve and the air storage cavity, a floating pressure control module is slidably arranged in the air storage cavity, a first sensor is arranged at the lower end of the air storage cavity, a second sensor is arranged at the upper end of the air storage cavity, the first sensor and the second sensor are communicatively connected to the electromagnetic multi-way valve; A magnetorheological fluid cavity is provided above the gas storage cavity, a damping plug is slidably provided in the magnetorheological fluid cavity, the damping plug is connected to the floating pressure control module through a rod, and an electromagnet ring is provided at the side end of the damping plug; After the electromagnet ring is energized to generate a magnetic field, the magnetorheological fluid between the electromagnet ring and the wall of the magnetorheological fluid chamber undergoes a rheological effect to form a plastic Bingham fluid to change the resistance of the floating pressure control module to move upward.

2. The non-methane total hydrocarbon dilution detection device according to claim 1, characterized in that: The air storage cavity and the magnetorheological fluid cavity are separated by a partition plate.

3. The non-methane total hydrocarbon dilution detection device according to claim 1, characterized in that: The non-methane total hydrocarbon dilution detection device also includes a hydrogen pipeline, and the hydrogen pipeline is communicated with the hydrogen flame ionization detector.

4. The non-methane total hydrocarbon dilution detection device according to claim 3, characterized in that: The hydrogen pipeline is connected to the hydrogen bottle, and a first flow meter is arranged on the hydrogen pipeline.

5. The non-methane total hydrocarbon dilution detection device according to claim 1, characterized in that: The air pipeline is connected to an air pump, and a second flow meter is arranged on the air pipeline.

6. The non-methane total hydrocarbon dilution detection device according to claim 5, characterized in that: An air filter is arranged on the air pipeline.

7. The non-methane total hydrocarbon dilution detection device according to claim 1, characterized in that: A third flow meter is arranged on the mixing pipeline.

8. The non-methane total hydrocarbon dilution detection device according to claim 1, characterized in that: A fourth flow meter is arranged on the return pipeline.

9. A non-methane total hydrocarbon dilution detection method, characterized in that: The non-methane total hydrocarbon dilution detection method is based on the non-methane total hydrocarbon dilution detection device described in any one of claims 1 to 8, and the non-methane total hydrocarbon dilution detection method comprises the following steps: (S1) The collection pump draws the exhaust gas into the sampling pipeline, and then enters the diverter valve. Part of the exhaust gas enters the return pipeline, and the remaining exhaust gas enters the electromagnetic multi-way valve. At the same time, the external air is compressed through the air pipeline and enters the electromagnetic multi-way valve to mix with the exhaust gas to dilute the volume concentration of non-methane total hydrocarbons in the exhaust gas; (S2) a portion of the mixed gas enters a hydrogen flame ionization detector through a mixing pipe for detection; (S3) The remaining mixed gas enters the gas storage chamber from the air hole of the gas storage valve to push the floating pressure control module upward. When the second sensor detects the floating pressure control module, the electromagnetic multi-way valve is controlled to close the sampling pipeline and the air pipeline, and the sampling pump stops working; (S4) At this time, the floating pressure control module compresses the mixed gas in the gas storage chamber to flow back to the electromagnetic multi-way valve, so that the mixed gas enters the hydrogen flame ionization detector for detection; When the first sensor detects the floating pressure control module, the electromagnetic multi-way valve is controlled to open the sampling pipeline and the air pipeline, and the sampling pump works again, and the above steps S1, S2 and S3 are repeated.

10. The non-methane total hydrocarbon dilution detection method according to claim 9, characterized in that: In the above steps, when the pressure of the mixed gas in the gas storage valve is adjusted, the electromagnet ring of the damping plug is energized to generate a magnetic field, so that the magnetorheological fluid between the electromagnet ring and the wall of the magnetorheological fluid chamber undergoes a rheological effect to form a plastic Bingham fluid, thereby changing the resistance of the floating pressure control module to move upward.

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