Gas component determination method

Abstract

The embodiment of the invention provides a gas component determination method which is applied to a gas component determination device, the gas component determination device comprises a sampling system and a detection system, the sampling system comprises a variable pressure part, the variable pressure part is provided with a variable pressure cavity, and the variable pressure part changes the volume of the variable pressure cavity to change the pressure intensity of gas. The gas component determination method comprises the following steps: controlling a sampling system to sample a gas source to be detected to obtain gas to be detected; the variable pressure part is controlled to change the volume of the variable pressure cavity, and the pressure intensity of the to-be-detected gas is adjusted to the first pressure intensity. And controlling the sampling system to be communicated with the detection system so as to transfer the to-be-detected gas to the detection system. And controlling the detection system to detect the gas components of the to-be-detected gas. According to the gas component determination method provided by the embodiment of the invention, the volume of the variable-pressure cavity is changed through the variable-pressure part, so that the adjustment of the pressure of the to-be-measured gas is realized, and the structure is simple. In addition, other gases do not need to be introduced for pressure regulation, so that the purity of the to-be-detected gas can be improved, and the detection precision is further improved.

Description

Technical Field

[0001] The present application relates to the technical field of radioactive gas component determination, and in particular to a gas component determination method. Background Art

[0002] Gas chromatography is widely used for analyzing gas due to its advantages of fast analysis speed, good repeatability, high measurement sensitivity, and simultaneous determination of multiple components. In related technologies, when using gas chromatography to analyze gas components, there is a problem that the sampling concentration cannot be guaranteed, which may affect the detection accuracy of gas components. Summary of the invention

[0003] In view of this, an embodiment of the present application provides a gas component determination method, which can improve the detection accuracy of gas components to a certain extent.

[0004] To achieve the above-mentioned purpose, an embodiment of the present application provides a gas component measurement method, which is applied to a gas component measurement device, wherein the gas component measurement device includes a sampling system and a detection system, wherein the sampling system includes a voltage transformer, wherein the voltage transformer is provided with a voltage transformer chamber, and the voltage transformer changes the pressure of the gas by changing the volume of the voltage transformer chamber. The gas component measurement method includes:

[0005] Controlling the sampling system to sample the gas source to be tested to obtain the gas to be tested;

[0006] Controlling the voltage transformation unit to change the volume of the voltage transformation chamber, and adjusting the pressure of the gas to be measured to a first pressure;

[0007] Controlling the sampling system to communicate with the detection system so that the gas to be tested is transferred to the detection system;

[0008] The detection system is controlled to detect the gas components of the gas to be detected.

[0009] In one embodiment, the sampling system includes a first vacuum pump, a control valve assembly and a sampling pipeline, the sampling pipeline includes a first sampling branch, a second sampling branch and a third sampling branch, one end of the first sampling branch is connected to the first vacuum pump, one end of the second sampling branch is connected to the gas source to be measured, and one end of the third sampling branch is connected to the pressure changing chamber, the control valve system is used to control the connection and closure between the first sampling branch, the second sampling branch and the third sampling branch, and the control of the sampling system to sample the gas source to be measured, and obtaining the gas to be measured includes:

[0010] Controlling the control valve assembly to connect the first sampling branch, the second sampling branch and the third sampling branch;

[0011] Controlling the first vacuum pump to evacuate the interior of the sampling pipeline assembly;

[0012] Controlling the control valve assembly to close the first sampling branch and connect the second sampling branch and the third sampling branch;

[0013] The gas source to be tested is controlled to supply gas to the pressure changing chamber, and the gas to be tested of the gas source to be tested is transferred to the pressure changing chamber through the second sampling branch and the third sampling branch.

[0014] In one embodiment, controlling the voltage transformation unit to change the volume of the voltage transformation chamber to adjust the pressure of the gas to be measured to the first pressure includes:

[0015] Controlling the volume of the pressure changing chamber to increase so as to increase the amount of the gas to be measured entering the pressure changing chamber;

[0016] Controlling the control valve assembly to close the third sampling branch;

[0017] The volume of the pressure-changing chamber is controlled to decrease until the pressure of the gas to be measured reaches the first pressure.

[0018] In one embodiment, the first pressure is the ambient pressure, the pressure changing part is a syringe, the syringe comprises a receiving chamber and a piston rod, the receiving chamber and the piston rod define the pressure changing chamber,

[0019] The step of controlling the volume of the pressure changing chamber to increase so as to increase the amount of the gas to be measured entering the pressure changing chamber comprises:

[0020] Controlling the piston rod of the syringe to move away from the accommodating chamber so as to increase the volume of the pressure-changing chamber;

[0021] The controlling the volume of the pressure-changing chamber to decrease until the pressure of the gas to be measured reaches the first pressure comprises:

[0022] The piston rod of the syringe slides freely to a stationary state.

[0023] In one embodiment, the volume of the accommodating chamber is not less than 100 ml.

[0024] In one embodiment, the detection system includes a constant pressure part and an analysis part, the constant pressure part includes a constant pressure chamber and a first opening and a second opening connected to the constant pressure chamber, and controlling the sampling system to be connected to the detection system to transfer the gas to be tested to the detection system includes:

[0025] Connecting the variable pressure chamber to the first opening to transfer the gas to be measured to the constant pressure chamber;

[0026] The pressure of the gas to be measured is adjusted to a second pressure by the constant pressure unit, and the second pressure is not less than the first pressure.

[0027] In one embodiment, the detection system includes a carrier gas unit, and the detection system determines the gas components of the gas to be detected including:

[0028] connecting the gas carrier section to the first opening, and connecting the analysis section to the second opening;

[0029] Pressurizing the constant pressure chamber through the gas carrier unit and transferring the gas to be measured to the analysis unit;

[0030] The gas component of the gas to be measured is detected by the analysis unit.

[0031] In one embodiment, the detection system includes a second vacuum pump, and before controlling the pressure-changing chamber to communicate with the first opening, the gas component determination method includes:

[0032] connecting the second vacuum pump to the first opening and / or the second opening;

[0033] sealing the constant pressure chamber;

[0034] The interior of the constant pressure chamber is evacuated by the second vacuum pump.

[0035] In one embodiment, the first pressure is equal to the second pressure, the first pressure is the ambient pressure, and the controlling the constant pressure unit to adjust the pressure of the gas to be measured to the second pressure includes:

[0036] The second opening is controlled to communicate with the external environment gas.

[0037] In one embodiment, the detection system includes a driving pump, the driving pump is connected to the constant pressure chamber, and the controlling the variable pressure chamber to be connected to the first opening so that the gas to be tested is transferred to the constant pressure chamber includes:

[0038] The driving pump is controlled to work, the pressure inside the constant pressure chamber is reduced, and the gas to be measured is guided to be transferred to the constant pressure chamber.

[0039] In the gas component determination method provided in the embodiment of the present application, the sampling system samples the gas source to be tested, and the pressure of the gas to be tested can be adjusted to the required pressure by changing the volume of the pressure transformer chamber through the pressure transformer in the sampling system, which is conducive to injecting the gas to be tested into the detection system for detection. On the other hand, the pressure transformer changes the volume of the pressure transformer chamber to achieve the pressure adjustment of the gas to be tested, and the structure is simple. In addition, there is no need to introduce other gases for pressure adjustment, thereby improving the purity of the gas to be tested, and then improving the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 This is a flow chart of a method for measuring gas components in one embodiment of the present application;

[0041] Figure 2 This is a schematic diagram of the structure of a sampling system in one embodiment of the present application;

[0042] Figure 3 A gas path diagram of transferring the gas to be tested to the constant pressure chamber in one embodiment of the present application;

[0043] Figure 4 A gas path diagram of the gas to be tested being transferred to the analysis unit in one embodiment of the present application;

[0044] Figure 5 A gas path diagram of the gas to be tested being transferred to the constant pressure chamber in a detection system with a driving pump in one embodiment of the present application;

[0045] Figure 6 This is a gas path diagram for transferring the gas to be tested to the analysis part in a detection system with a driving pump in one embodiment of the present application.

[0046] Reference numerals:

[0047] 1. Sampling system; 11. Voltage transformer; 111. Voltage transformer chamber; 12. First vacuum pump; 13. Control valve assembly; 14. Sampling pipeline; 141. First sampling branch; 142. Second sampling branch; 143. Third sampling branch; 2. Detection system; 21. Constant pressure section; 211. First opening; 212. Second opening; 22. Analysis section; 23. Gas carrier section; 24. Drive pump; 3. Gas source to be tested. DETAILED DESCRIPTION

[0048] It should be noted that, in the absence of conflict, the embodiments and technical features in the embodiments of the present application can be combined with each other, and the detailed description in the specific implementation method should be understood as an explanation of the purpose of the present application and should not be regarded as an improper limitation on the present application.

[0049] In the description of the embodiments of the present application, it should be noted that the terms "transmission direction of the ray", "height direction", "first direction", "second direction", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings. These orientation terms are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the embodiments of the present application. The present application will be further described in detail below in conjunction with the drawings and specific embodiments.

[0050] At present, the main methods for analyzing gas components include gas chromatography, mass spectrometry, Raman spectroscopy, infrared spectroscopy, etc. Among them, gas chromatography is widely used for analyzing gas due to its advantages of fast analysis speed, good repeatability, high measurement sensitivity, and simultaneous determination of multiple components.

[0051] When the sample gas source pressure is positive (the gas source pressure is greater than the ambient pressure), the sample gas source automatically flows into the chromatograph, and then the chromatographic analysis is performed. In this case, the operation is relatively simple. When the sample gas source pressure is low pressure (the gas source pressure is less than the ambient pressure), the sample gas source will not automatically flow into the chromatograph.

[0052] At present, one solution for gas chromatography measurement of low-pressure gas is to fill the sample gas with other gases to increase the pressure of the low-pressure sample gas before measurement and analysis. This analysis method requires that the gas mixture is very uniform and the dilution factor is very accurate, which is difficult to operate.

[0053] Another solution is to connect a vacuum pump to the sample gas outlet of the chromatograph, and use the vacuum pump to evacuate the sample pipeline of the chromatograph so that the low-pressure gas can flow into the chromatograph. This method is mainly used for valve-injected gas chromatographs. For direct access to the gas supply system, the gas supply system directly introduces the gas into the measuring device, and a vacuum pump can meet the measurement requirements. For taking gas from the gas supply system through the sampling system and then introducing it into the analysis system through the gas taking system, a vacuum pump is required for each of the sampling system and the analysis system. The additional vacuum pump makes the experimental device complicated, and this method is not suitable for field measurements.

[0054] For gas chromatographs that rely on a built-in pump for sample injection, when the built-in pump extracts low-pressure gas, it is easy to draw air into the instrument regardless of whether the sample pipeline is in a vacuum state, resulting in inaccurate measurement results.

[0055] This application embodiment provides a method for measuring gas components. Figures 2 to 6 , applied to a gas component measuring device, the gas component measuring device includes a sampling system 1 and a detection system 2, the sampling system 1 includes a voltage transformer 11, the voltage transformer 11 is provided with a voltage transformer chamber 111, and the voltage transformer 11 changes the volume of the voltage transformer chamber 111 to change the pressure of the gas.

[0056] Gas component determination device is a device used to determine the various components and their content ratios in a mixed gas. It is widely used in many fields such as industrial waste gas monitoring, environmental air quality testing, chemical production process control, etc. Through the coordinated work of specialized technical means and components, it can achieve accurate determination of various components in the target gas sample such as oxygen, nitrogen, carbon dioxide, harmful pollutants, etc.

[0057] The sampling system 1 is the part of the gas component determination device that is responsible for collecting the target gas and transporting it to the subsequent detection link. The gas sample collected by the sampling system 1 is required to truly and accurately reflect the overall characteristics of the detected gas.

[0058] Detection system 2 is responsible for analyzing the properties and content of each component in the gas sample, and uses technical means such as chromatography (gas chromatograph uses the differences in the distribution coefficients of different substances between the stationary phase and the mobile phase to separate the components and then detect them), spectral analysis (based on the absorption or emission characteristics of specific gases at specific wavelengths of light to determine the composition and concentration), sensor detection (various electrochemical and infrared sensors are sensitive to target gases) to output accurate detection data.

[0059] The core function of the pressure transformer 11 is to change the gas pressure. The volume of the internal pressure transformer chamber 111 is adjusted through mechanical structure or other means to compress or expand the gas in the chamber. According to the ideal gas state equation (PV=nRT, P is pressure, V is volume, n is the amount of substance, R is the gas constant, and T is temperature), when the temperature and the amount of substance are basically stable, the volume change causes the pressure change to meet different sampling and transmission requirements.

[0060] The pressure-changing chamber 111 contains a gas space inside the pressure-changing part 11, and its volume is variable. For example, the piston-type pressure-changing chamber 111, the piston moves to change the size of the chamber, or the flexible bladder-type pressure-changing chamber 111, changes its own volume through external pressure and mechanical stretching, thereby regulating the gas pressure in the chamber, creating suitable conditions for the subsequent flow of the gas and entering the detection system 2.

[0061] See also Figure 1 The gas component determination method includes the following steps S101 to S104:

[0062] Step S101, controlling the sampling system to sample the gas source to be tested to obtain the gas to be tested.

[0063] The sampling system 1 is controlled to operate so as to interact effectively with the gas source 3 to be tested, and to extract a proper amount of gas therefrom as the sample to be tested.

[0064] Step S102, controlling the pressure transformation unit to change the volume of the pressure transformation chamber to adjust the pressure of the gas to be measured to a first pressure.

[0065] After the gas to be tested is obtained through step S101, the gas enters the pressure transformer chamber 111. The volume of the pressure transformer chamber 111 is adjusted by the pressure transformer 11. As the volume of the pressure transformer chamber 111 gradually increases or decreases, the density of the gas molecules to be tested changes accordingly, thereby causing its pressure to approach the pre-planned "first pressure" in a set direction (increase or decrease), ensuring that the gas is smoothly connected to the subsequent detection links in an ideal pressure state. For the low-pressure gas source 3 to be tested, the gas to be tested is pressurized by the pressure transformer 11, so that the gas to be tested is subsequently injected into the detection system 2 for detection.

[0066] Step S103, controlling the sampling system to communicate with the detection system so that the gas to be tested is transferred to the detection system.

[0067] The gas to be tested with adjusted pressure is smoothly transferred from the sampling system 1 to the detection system 2 for detection.

[0068] Step S104, controlling the detection system to detect the gas components of the gas to be detected.

[0069] The detection system 2 detects the gas components of the gas to be detected to obtain the required data.

[0070] In the gas component determination method provided in the embodiment of the present application, the sampling system 1 samples the gas source 3 to be tested, and the pressure of the gas to be tested can be adjusted to the required pressure by changing the volume of the pressure-changing chamber 111 through the pressure-changing unit 11 in the sampling system 1, which is conducive to injecting the gas to be tested into the detection system 2 for detection. On the other hand, the pressure-changing unit 11 changes the volume of the pressure-changing chamber 111 to achieve the pressure adjustment of the gas to be tested, and the structure is simple. In addition, there is no need to introduce other gases for pressure adjustment, thereby improving the purity of the gas to be tested, and then improving the detection accuracy.

[0071] Here, we take the measurement of low-pressure gas source as an example. The low-pressure gas source here refers to a gas source with a lower pressure than the ambient air pressure. For a high-pressure gas source, the gas pressure of the high-pressure gas source is greater than the ambient air pressure. Under the pressure difference, the high-pressure gas source can directly drive the gas into the measuring instrument, but the low-pressure gas source cannot achieve autonomous air intake.

[0072] The gas component determination method provided in the embodiment of the present application can effectively collect and determine the components of low-pressure gas sources that are difficult to determine, while ensuring the accuracy of the component determination.

[0073] For the low-pressure gas source, first, the sampling system 1 is controlled to perform a sampling operation on the low-pressure gas source to be tested. The voltage transformer 11 in the sampling system 1 starts to work, and the voltage transformer 11 expands the voltage transformer chamber 111, so that the gas pressure in the voltage transformer chamber 111 is lower than the gas pressure of the low-pressure gas source, and the voltage transformer chamber 111 is connected to the low-pressure gas source. Under the action of the pressure difference, the gas of the low-pressure gas source is pressed into the voltage transformer chamber 111.

[0074] Next, the voltage transformer 11 is controlled to change the volume of the voltage transformer chamber 111. Because the pressure of the low-pressure gas source is relatively low, the pressure of the gas to be measured needs to be adjusted to the first pressure. This process may be achieved by reducing the volume of the voltage transformer chamber 111. According to the ideal gas state equation PV=nRT (where P is pressure, V is volume, n is the amount of substance, R is the molar gas constant, and T is temperature), when the temperature and the amount of substance remain basically unchanged, a reduction in volume will increase the pressure.

[0075] The first pressure here is a constant pressure specified to ensure that the pressure of the gas obtained by each sampling is consistent. For example, it can be the ambient air pressure to meet the detection requirements of the detection system 2 and improve the accuracy and stability of the detection.

[0076] Then, when the pressure of the gas to be measured reaches the first pressure, the sampling system 1 is controlled to be connected with the detection system 2. At the moment of connection, the stability of the gas transfer process must be ensured to prevent the turbulence or unstable flow of the gas caused by factors such as pressure difference from affecting the detection results. This can be achieved by setting some buffer components or controlling the rate of connection.

[0077] Finally, after the gas to be tested is transferred to the detection system 2, the detection system 2 uses various detection principles and equipment inside it, such as chromatography analysis technology, mass spectrometry analysis technology, etc., to accurately detect the gas components of the gas to be tested in the low-pressure gas source.

[0078] In this way, the low-pressure gas source can be sampled without setting up a vacuum pump. The method is simple and convenient, and can meet the sampling and measurement requirements in environments with limited conditions such as the field. In some embodiments, please refer to Figure 2 The sampling system 1 includes a first vacuum pump 12, a control valve assembly 13 and a sampling pipeline 14. The sampling pipeline 14 includes a first sampling branch 141, a second sampling branch 142 and a third sampling branch 143. One end of the first sampling branch 141 is connected to the first vacuum pump 12, one end of the second sampling branch 142 is connected to the gas source 3 to be tested, and one end of the third sampling branch 143 is connected to the pressure change chamber 111. The control valve system is used to control the connection and closing between the first sampling branch 141, the second sampling branch 142 and the third sampling branch 143.

[0079] The first vacuum pump 12 is a device that uses mechanical, physical, chemical or other methods to evacuate gas from a container to create a lower pressure than normal pressure (ie, negative pressure environment) in a specific space. In the sampling system 1 for measuring gas components, it mainly plays the role of extracting gas.

[0080] The control valve assembly 13 is a group of valves with the function of controlling the on-off of the gas passage. According to the preset program, operating instructions or system working requirements, it can accurately control the various gas pipelines (such as the first, second and third sampling branches 143) to be in a connected state to facilitate gas circulation, or in a closed state to cut off the gas flow, thereby realizing the refined management of gas flow direction and flow control.

[0081] The sampling pipeline 14 builds a connection path for gases of different sources and destinations, ensuring that the gas starts from the gas source 3 to be tested, is adjusted by the control valve assembly 13, and smoothly reaches the destination such as the pressure chamber 111, providing a sample basis for subsequent processing and detection processes. The sampling pipeline 14 should be sealed to maintain the integrity of the gas sample.

[0082] One end of the first sampling branch 141 is connected to the first vacuum pump 12 and is responsible for carrying the gas flow driven by the suction force of the vacuum pump.

[0083] The second sampling branch 142 is the entrance for the gas to be tested to enter the sampling system 1, allowing the gas to be tested to be smoothly connected from the gas source end, so that there is a reliable sample source for subsequent analysis and determination.

[0084] One end of the third sampling branch 143 is connected to the pressure-changing chamber 111 , laying a foundation for adjusting the gas pressure in the pressure-changing chamber 111 as needed, and plays a role in transmitting and adjusting the pressure of the gas to be tested.

[0085] Step S101 includes the following steps S201 to S204:

[0086] Step S201, controlling the control valve assembly to connect the first sampling branch, the second sampling branch and the third sampling branch.

[0087] As a key starting action in the sampling stage of the entire gas component determination process, controlling the control valve assembly 13 to connect the first sampling branch 141, the second sampling branch 142 and the third sampling branch 143 can establish a complete and coherent gas transmission path, so that their internal spaces are interconnected to form a channel system in which the gas can flow smoothly, which is beneficial to the circulation of the sampling gas in the sampling pipeline 14.

[0088] Step S202, controlling the first vacuum pump to evacuate the interior of the sampling pipeline.

[0089] The first vacuum pump 12 starts to operate, and draws gas from one end of the sampling pipe 14 connected thereto by virtue of the suction effect generated by its mechanical structure. As the pump body continues to work, gas is continuously drawn out, so that the air or other residual gas originally filled in the sampling pipe 14 component is gradually reduced, and the air pressure continues to drop until the set vacuum degree requirement is reached, creating a negative pressure environment. This removes impurities for the subsequent accurate collection of the target gas in the gas source 3 to be tested, and reduces the interference of the original gas in the pipe with the analysis of the gas to be tested.

[0090] Step S203, controlling the control valve assembly to close the first sampling branch and connect the second sampling branch and the third sampling branch.

[0091] The control valve assembly 13 blocks the first sampling branch 141, so that the gas in the branch cannot flow, and the vacuum pump is blocked from sucking the gas to be tested. At the same time, the channel between the second sampling branch 142 and the third sampling branch 143 is opened, so that the gas to be tested can flow into the pressure changing chamber 111, preparing for the subsequent pressure regulation of the gas to be tested.

[0092] Step S204, controlling the gas source to be tested to supply gas to the pressure transformation chamber, and the gas to be tested of the gas source to be tested is transferred to the pressure transformation chamber through the second sampling branch and the third sampling branch.

[0093] The gas source 3 to be tested supplies gas to the pressure changing chamber 111 , and the gas to be tested flows into the pressure changing chamber 111 , so as to realize the collection and pressure regulation of the gas to be tested, and prepare for the subsequent injection of the sampled gas into the detection system 2 .

[0094] By controlling the first vacuum pump 12, the impurity gas in the sampling pipeline 14 is removed, reducing the influence of the impurity gas on the purity of the sampled gas, which is conducive to improving the accuracy of the detection. At the same time, by controlling the valve assembly 13 to connect and close each path, the sampling system 1 can collect the gas to be tested, which is easy to operate.

[0095] In some embodiments, see Figure 2 , step S102 includes the following steps S301 to S302:

[0096] Step S301, controlling the volume of the pressure changing chamber to increase so as to increase the amount of the gas to be measured entering the pressure changing chamber.

[0097] Based on the ideal gas state equation "PV = nRT" (when the temperature T and the amount of substance n are relatively stable, the pressure P is inversely proportional to the volume V), the internal space of the pressure-changing chamber 111 becomes larger, and the pressure in the chamber will decrease accordingly. At this time, compared with the outside of the pressure-changing chamber 111 (such as the connected sampling pipeline 14, the environment where the gas source 3 to be tested is located, etc.), an obvious pressure difference is formed. Under the "drive" of the pressure difference, the gas to be tested will spontaneously flow into the pressure-changing chamber 111 with a lower pressure, thereby increasing the amount of the gas to be tested entering the pressure-changing chamber 111.

[0098] Step S302, controlling the control valve assembly to close the third sampling branch.

[0099] Block the gas flow channel of the third sampling branch 143. In this way, the gas that could originally flow freely in the branch is effectively blocked, and the gas can no longer continue to move forward or back through this branch, thereby achieving physical isolation of the gas transmission path of the branch and preparing for subsequent pressure regulation.

[0100] Step S303, controlling the volume of the pressure changing chamber to decrease until the pressure of the gas to be measured reaches the first pressure.

[0101] Based on the ideal gas state equation "PV=nRT" (when the temperature T and the amount of substance n are relatively stable, the pressure P is inversely proportional to the volume V), when the variable pressure chamber 111 is controlled to gradually reduce its volume, the activity space of the gas molecules in the chamber is compressed, and the collisions between the gas molecules become more frequent and violent, resulting in an increase in pressure. The pressure of the measured gas is set to the first pressure, in preparation for the subsequent injection of the gas to be measured into the detection system 2.

[0102] Here, it should be noted that the specific size of the first pressure is not limited here, and is determined according to the pressure required for detection.

[0103] Exemplarily, in order to facilitate the injection of the gas to be tested into the detection system 2 , the first pressure is greater than the ambient pressure, so that the gas to be tested can more easily enter the detection system 2 with the assistance of the pressure difference.

[0104] By controlling the volume of the pressure-changing chamber 111 to increase, the amount of gas to be collected is increased, and by controlling the volume of the pressure-changing chamber 111 to decrease, the pressure of the gas to be measured is adjusted to the required first pressure, in preparation for subsequent detection.

[0105] In some embodiments, see Figure 2 The first pressure is the ambient pressure, the pressure changing part 11 is a syringe, the syringe includes a accommodating chamber and a piston rod, and the accommodating chamber and the piston rod define a pressure changing chamber 111.

[0106] Step S301 includes: controlling the piston rod of the syringe to move away from the accommodating chamber so as to increase the volume of the pressure-changing chamber.

[0107] The operation of controlling the piston rod of the syringe to move away from the accommodating chamber is based on the structural characteristics of the syringe and uses mechanical movement to change the internal space. When the piston rod is pulled outward, the volume of the variable pressure chamber 111 enclosed by the accommodating chamber and the piston rod gradually increases. According to the ideal gas state equation, the pressure decreases accordingly, and the external gas to be tested flows into the variable pressure chamber 111 along the pressure difference, thereby increasing the gas collection volume and storing enough gas samples to be tested.

[0108] Step S303 includes: the piston rod of the syringe slides freely to a stationary state.

[0109] The gas pressure is automatically adjusted to the ambient pressure (first pressure). When the gas collection and pressure adjustment phase is completed, the constraints on the piston rod are relaxed. Under the combined effects of gas pressure, friction, and its own gravity, the piston rod slides freely in the chamber. As the gas in the chamber is compressed, the pressure increases until it is balanced with the external ambient pressure. The piston rod is stationary, and the gas pressure reaches the set first pressure, laying the foundation for the subsequent smooth docking with the detection system 2.

[0110] In some embodiments, see Figure 2 , the volume of the accommodating chamber shall not be less than 100ml.

[0111] Based on the equation derived from the ideal gas state equation, "P1V1=P2V2" (P1 is the pressure of the gas source 3 to be tested, P2 is the first pressure, V1 is the volume of the containing chamber, and V2 is the volume of the gas to be tested), for the detection system 2, at least 10 ml of sampling gas is generally required for detection; for the syringe, the first pressure is usually the ambient air pressure, and to facilitate the syringe to adjust the air pressure, the pressure of the gas source 3 to be tested allowed by the syringe to adjust the air pressure is usually not less than 0.9 times the ambient air pressure. According to the above content, it can be deduced that in order to ensure that the volume of the gas to be tested at the ambient air pressure that the syringe can finally obtain is not less than the minimum volume required by the detection system 2, the volume of the containing chamber needs to be increased so that V1 can meet the measurement requirements.

[0112] In some embodiments, see Figure 3 The detection system 2 includes a constant pressure part 21 and an analysis part 22. The constant pressure part 21 includes a constant pressure chamber and a first opening 211 and a second opening 212 communicating with the constant pressure chamber.

[0113] The main function of the constant pressure unit 21 is to further accurately adjust the pressure of the gas to be tested so that it reaches a specific pressure value (i.e., the second pressure) suitable for subsequent detection and analysis by the analysis unit 22. It is composed of a constant pressure chamber and a first opening 211 and a second opening 212 connected to the constant pressure chamber, and realizes stable pressure regulation through an internal working mechanism.

[0114] The constant pressure chamber is a relatively closed space for accommodating the gas to be tested transferred from the variable pressure chamber 111. In this chamber, through a specific structural design and working principle, the pressure of the gas to be tested can be finely adjusted to meet the pressure requirements of subsequent tests.

[0115] The first opening 211 and the second opening 212 are a communication channel on the constant pressure chamber to enable gas to enter and exit the constant pressure chamber.

[0116] Step S103 includes the following steps S401 to S402:

[0117] Step S401, connecting the variable pressure chamber to the first opening to transfer the gas to be measured to the constant pressure chamber.

[0118] The pressure-changing chamber 111 is connected to the first opening 211 to transfer the gas to be tested to the constant pressure chamber. After the gas to be tested is collected and initially pressure-regulated in the pressure-changing chamber 111 in the previous steps, the pressure-changing chamber 111 and the constant pressure chamber are connected through the first opening 211 by controlling the pressure-changing chamber 111. In this way, the gas to be tested in the pressure-changing chamber 111 will be smoothly transferred to the constant pressure chamber along the connected channel under the action of the internal and external pressure difference (the pressure difference that may exist between the pressure-changing chamber 111 and the constant pressure chamber) or other driving forces (such as a slight air pressure push, etc.), so as to prepare for further pressure regulation in the constant pressure chamber.

[0119] Step S402: adjusting the pressure of the gas to be measured to a second pressure by a constant pressure unit, wherein the second pressure is not less than the first pressure.

[0120] The pressure of the gas to be tested is adjusted to a second pressure by the constant pressure unit 21, and the second pressure is not less than the first pressure. The gas to be tested is finely adjusted so that its pressure gradually increases or stabilizes at a preset second pressure value. It is ensured that the gas enters the analysis unit 22 with sufficient pressure so that accurate and stable detection and analysis can be performed in the analysis unit 22, avoiding problems such as weak detection signals and inaccurate analysis results due to insufficient pressure.

[0121] Here, it should be noted that the specific size of the second pressure is not limited here, for example, it can be equal to the first pressure, or it can be other pressure greater than the first pressure, which is specifically determined according to the pressure measured by the analysis unit 22.

[0122] In some embodiments, see Figure 4 , the detection system 2 includes a carrier gas unit 23, and step S104 includes the following steps S501 to S503:

[0123] The carrier part is a component in the detection system 2 that can supply a continuous and stable gas flow, and inert gases such as nitrogen and helium are usually selected. The gas pressure assists the transmission of the gas to be tested, overcomes the pipeline resistance, and causes the gas to be tested to flow into the analysis part 22 along a predetermined route. In addition, the carrier part can create a specific gas environment in the analysis part 22, which helps to optimize the detection conditions and improve the detection accuracy.

[0124] Step S501, connecting the carrier gas part to the first opening, and connecting the analysis part to the second opening.

[0125] The carrier gas section 23 is seamlessly connected to the first opening 211 , so that the airflow provided by the carrier gas section 23 can be injected into the constant pressure chamber, and the analysis section 22 is synchronously connected to the second opening 212 , and the gas to be tested can enter the analysis section 22 through the second opening 212 for detection.

[0126] Step S502, pressurizing the constant pressure chamber through the carrier gas unit and transferring the gas to be tested to the analysis unit.

[0127] The carrier gas section 23 is activated, and the inert carrier gas enters the constant pressure chamber according to the set pressure and flow rate. The pressure in the constant pressure chamber increases, and driven by the pressure difference, the gas to be measured flows into the analysis section 22, realizing efficient and directional transfer of the gas.

[0128] Step S503, detecting the gas components of the gas to be tested by the analysis unit.

[0129] The driving of the carrier unit helps the gas to be tested to stably enter the analysis unit 22 for testing, which helps to ensure the stability of the testing environment, thereby improving the testing accuracy.

[0130] In some embodiments, the detection system 2 includes a second vacuum pump. Before controlling the pressure changing chamber 111 to communicate with the first opening 211, the gas component determination method includes the following steps S601 to S602:

[0131] Step S601, connecting the second vacuum pump to the first opening and / or the second opening.

[0132] The second vacuum pump is connected to the first opening 211 and / or the second opening 212. It can be selected to be connected to the first opening 211, the second opening 212 separately, or connected to both at the same time, so as to serve as the hardware basis for subsequent vacuum operations, so that the second vacuum pump can act on the gas inside the constant pressure chamber.

[0133] Step S602, sealing the constant pressure chamber.

[0134] Seal the constant pressure chamber to ensure that there are no gas leakage points except the opening connected to the second vacuum pump, so as to ensure the effectiveness and efficiency of subsequent vacuum pumping operations, ensure that the gas extracted by the vacuum pump actually comes from the inside of the constant pressure chamber, maintain the pressure in the chamber to drop as expected, and prevent external gas from interfering with the vacuum pumping process.

[0135] Step S603, evacuating the interior of the constant pressure chamber by using a second vacuum pump.

[0136] The interior of the constant pressure chamber is evacuated by a second vacuum pump, and the gas originally existing in the constant pressure chamber is continuously extracted by means of the mechanical operation and exhaust mechanism of the vacuum pump. As the gas is continuously extracted, the gas pressure in the chamber gradually decreases until a vacuum degree that meets the requirements of the subsequent gas processing process is reached. For example, a pure and low-pressure environment is prepared to receive the gas to be tested from the variable pressure chamber 111, thereby reducing the interference and mixing effects of the original gas in the chamber on the gas to be tested.

[0137] In some embodiments, see Figure 3, the first pressure is equal to the second pressure, the first pressure is the ambient pressure, and the constant pressure part is controlled to adjust the pressure of the gas to be measured to the second pressure, including:

[0138] The second opening is controlled to communicate with the external environment gas.

[0139] When the second opening 212 is connected to the gas of the external environment, the variable pressure chamber 111 and the constant pressure chamber are both connected to the gas of the external environment, and the internal gas and the external environment form an interactive system driven by air pressure difference. If the pressure of the gas to be measured in the constant pressure chamber is higher than the ambient pressure, the gas will naturally diffuse outward through the second opening 212 until the pressure in the chamber reaches equilibrium with the external ambient pressure (i.e., the second pressure); on the contrary, if the pressure in the chamber is slightly lower, the external ambient gas will flow into the constant pressure chamber in an appropriate amount, causing the pressure in the chamber to rise to the level of the ambient pressure, thereby accurately adjusting the pressure of the gas to be measured to the second pressure state equivalent to the ambient pressure, and preparing for the subsequent smooth input into the analysis unit 22 and accurate detection.

[0140] In some embodiments, a flow meter is provided at the second opening to detect whether the sampled gas fills the constant pressure chamber.

[0141] In some embodiments, the second opening is immersed in water, and whether bubbles appear in the water is used to determine whether the sampled gas enters the constant pressure chamber.

[0142] This application embodiment provides a kind of Figures 5 and 6 The detection system 2 includes a driving pump 24, the driving pump 24 is connected to the constant pressure chamber, and the control pressure chamber is connected to the first opening so that the gas to be tested is transferred to the constant pressure chamber.

[0143] The driving pump is controlled to work, the pressure inside the constant pressure chamber is reduced, and the gas to be measured is guided to transfer to the constant pressure chamber.

[0144] In some embodiments, in order to improve the accuracy of the detection system 2, the flow cross-sectional area of ​​the structure for the airflow inside the detection system 2 is set too small, and the resistance of the manual injection sampling system 1 is too large. By setting a driving pump 24, the driving pump 24 works so that the pressure inside the constant pressure chamber is lower than the variable pressure chamber 111, which assists the transfer of the gas to be tested to the constant pressure chamber and reduces the difficulty of manual operation.

[0145] The above description is only a preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application are included in the protection scope of the present application.

Claims

1. A gas component measurement method, applied to a gas component measurement device, characterized in that: The gas component measuring device comprises a sampling system and a detection system, the sampling system comprises a voltage transformer, the voltage transformer is provided with a voltage transformer chamber, the voltage transformer changes the pressure of the gas by changing the volume of the voltage transformer chamber, and the gas component measuring method comprises: Controlling the sampling system to sample the gas source to be tested to obtain the gas to be tested; Controlling the voltage transformation unit to change the volume of the voltage transformation chamber, and adjusting the pressure of the gas to be measured to a first pressure; Controlling the sampling system to communicate with the detection system so that the gas to be tested is transferred to the detection system; The detection system is controlled to detect the gas components of the gas to be detected.

2. The gas composition determination method according to claim 1, characterized in that: The sampling system comprises a first vacuum pump, a control valve assembly and a sampling pipeline, wherein the sampling pipeline comprises a first sampling branch, a second sampling branch and a third sampling branch, wherein one end of the first sampling branch is connected to the first vacuum pump, one end of the second sampling branch is connected to the gas source to be measured, and one end of the third sampling branch is connected to the pressure changing chamber, wherein the control valve system is used to control the connection and closure between the first sampling branch, the second sampling branch and the third sampling branch, wherein the control system is used to sample the gas source to be measured, and obtaining the gas to be measured comprises: Controlling the control valve assembly to connect the first sampling branch, the second sampling branch and the third sampling branch; Controlling the first vacuum pump to evacuate the interior of the sampling pipeline; Controlling the control valve assembly to close the first sampling branch and connect the second sampling branch and the third sampling branch; The gas source to be tested is controlled to supply gas to the pressure changing chamber, and the gas to be tested of the gas source to be tested is transferred to the pressure changing chamber through the second sampling branch and the third sampling branch.

3. The gas composition determination method according to claim 2, characterized in that: The step of controlling the pressure transformation unit to change the volume of the pressure transformation chamber to adjust the pressure of the gas to be measured to the first pressure includes: Controlling the volume of the pressure changing chamber to increase so as to increase the amount of the gas to be measured entering the pressure changing chamber; Controlling the control valve assembly to close the third sampling branch; The volume of the pressure-changing chamber is controlled to decrease until the pressure of the gas to be measured reaches the first pressure.

4. The gas composition determination method according to claim 3, characterized in that: The first pressure is the ambient pressure, the pressure changing part is a syringe, the syringe comprises a receiving chamber and a piston rod, the receiving chamber and the piston rod define the pressure changing chamber, The step of controlling the volume of the pressure changing chamber to increase so as to increase the amount of the gas to be measured entering the pressure changing chamber comprises: Controlling the piston rod of the syringe to move away from the accommodating chamber so as to increase the volume of the pressure-changing chamber; The controlling the volume of the pressure-changing chamber to decrease until the pressure of the gas to be measured reaches the first pressure comprises: The piston rod of the syringe slides freely to a stationary state.

5. The gas composition determination method according to claim 4, characterized in that: The volume of the accommodating chamber is not less than 100 ml.

6. The gas composition determination method according to any one of claims 1 to 5, characterized in that: The detection system includes a constant pressure part and an analysis part, the constant pressure part includes a constant pressure chamber and a first opening and a second opening connected to the constant pressure chamber, and the control of connecting the sampling system to the detection system to transfer the gas to be detected to the detection system includes: Connecting the variable pressure chamber to the first opening to transfer the gas to be measured to the constant pressure chamber; The pressure of the gas to be measured is adjusted to a second pressure by the constant pressure unit, and the second pressure is not less than the first pressure.

7. The gas composition determination method according to claim 6, characterized in that: The detection system includes a carrier gas unit, and the detection system determines the gas components of the gas to be detected by: connecting the gas carrier section to the first opening, and connecting the analysis section to the second opening; Pressurizing the constant pressure chamber through the gas carrier unit and transferring the gas to be measured to the analysis unit; The gas component of the gas to be measured is detected by the analysis unit.

8. The gas composition determination method according to claim 6, characterized in that: The detection system includes a second vacuum pump. Before controlling the pressure-changing chamber to communicate with the first opening, the gas component determination method includes: connecting the second vacuum pump to the first opening and / or the second opening; sealing the constant pressure chamber; The interior of the constant pressure chamber is evacuated by the second vacuum pump.

9. The gas composition determination method according to claim 6, characterized in that: The first pressure is equal to the second pressure, the first pressure is the ambient pressure, and the controlling the constant pressure unit to adjust the pressure of the gas to be measured to the second pressure includes: The second opening is controlled to communicate with the external environment gas.

10. The gas composition measuring method according to claim 6, characterized in that: The detection system includes a driving pump, the driving pump is connected to the constant pressure chamber, and the controlling the variable pressure chamber to be connected to the first opening so that the gas to be tested is transferred to the constant pressure chamber includes: The driving pump is controlled to work, the pressure inside the constant pressure chamber is reduced, and the gas to be measured is guided to be transferred to the constant pressure chamber.

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