A dynamic constant pressure control device and method for hydrogen gas in a chromatograph

Abstract

This invention discloses a dynamic constant pressure control device and method for hydrogen gas in a gas chromatograph, belonging to the field of gas analysis instrument control technology. It includes a chromatograph body, a ten-way valve, a multi-stage electromagnetic gas path control module, a pressure regulating chamber, a pressure regulating module group, and a pressure regulating control module. The pressure regulating chamber is connected to the hydrogen inlet through a first pressure regulating module, and is connected to the gas path pipelines of the multi-stage electromagnetic gas path control module through a second and third pressure regulating module, respectively. The pressure regulating control module controls the opening and closing of each pressure regulating module according to pressure changes at various points, achieving dynamic pressure balance. This invention buffers high pressure and supplements low pressure through the pressure regulating chamber, eliminating pressure surges in the closed pipeline when the ten-way valve switches, thus maintaining a stable hydrogen supply. This method achieves closed-loop control through initialization, pressure monitoring, predictive adjustment, and flow compensation steps. This invention solves the measurement deviation problem caused by hydrogen pressure fluctuations, improving the analytical accuracy and baseline stability of the chromatograph.

Description

Technical Field

[0001] This invention belongs to the field of hydrogen flame chromatography technology, and particularly relates to a dynamic constant pressure control device and method for hydrogen gas in a chromatograph. Background Technology

[0002] Hydrogen flame chromatograph (HFC) is a key piece of equipment used in oil exploration and development for detecting formation gas samples. It achieves continuous analysis by ionizing hydrocarbon components through the combustion of hydrogen and air in the analyzer. To meet the demands of rapid drilling operations, modern chromatographs commonly employ ten-way valve splitting technology, dividing the sample gas into two alternate streams delivered to the analyzer for uninterrupted and efficient analysis. This system typically features an independent dual-stream hydrogen supply structure, each corresponding to a different injection channel. During the switching process of the ten-way valve, an electromagnetic gas path control module controls the on / off state of the gas supply path, ensuring staggered gas supply.

[0003] However, in the existing technology, the hydrogen pressure is affected by the instantaneous high or low pressure phenomenon caused by the closed space formed when the two hydrogen pipelines switch, which disrupts the stability of the gas pressure in the quantitative tube. This leads to fluctuations in the measurement signal of the detector, making baseline correction difficult and causing deviations in the determination of hydrocarbon component content, which seriously affects the analytical accuracy and operational reliability. Summary of the Invention

[0004] The purpose of this invention is to provide a dynamic constant pressure control device and method for hydrogen gas in a chromatograph, so as to overcome the shortcomings of the prior art.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] In a first aspect, the present invention provides a dynamic constant pressure control device for hydrogen gas in a chromatograph, comprising a chromatograph body, wherein a ten-way valve, a multi-stage electromagnetic gas path control module, an integrated control module, a ten-way valve control module, a pressure regulating chamber, a pressure regulating module group, and a pressure regulating control module are fixedly connected inside the chromatograph body; the ten-way valve is fixedly connected to the multi-stage electromagnetic gas path control module via a gas path pipeline, the pressure regulating chamber is connected to the multi-stage electromagnetic gas path control module via a gas path pipeline, the multi-stage electromagnetic gas path control module is also connected to a hydrogen inlet and an air inlet, and a flow sensor is disposed inside the pressure regulating chamber;

[0007] The pressure regulating module group includes a first pressure regulating module, a second pressure regulating module and a third pressure regulating module that are respectively connected to the pressure regulating chamber through gas pipelines. The first pressure regulating module is connected to the hydrogen inlet and is also connected to a bypass pressure relief valve and a hydrogen replenishment valve.

[0008] Both the pressure regulating control module and the ten-way valve control module are connected to the pressure regulating module group via signal lines. The pressure regulating control module communicates with the multi-stage electromagnetic pneumatic circuit control module. An identifier is connected between the multi-stage electromagnetic pneumatic circuit control module and the ten-way valve.

[0009] Furthermore, the multi-level electromagnetic pneumatic circuit control module includes a first electromagnetic pneumatic circuit control module, a second electromagnetic pneumatic circuit control module, a third electromagnetic pneumatic circuit control module, and a fourth electromagnetic pneumatic circuit control module.

[0010] The input end of the first electromagnetic gas circuit control module is connected to the hydrogen inlet, and the output end of the first electromagnetic gas circuit control module is sequentially connected to the second pressure regulating module, the input end of the second electromagnetic gas circuit control module, the input end of the third electromagnetic gas circuit control module, the input end of the fourth electromagnetic gas circuit control module, and the sixth interface f of the ten-way valve.

[0011] The output of the first electromagnetic pneumatic control module is also connected in sequence to the third pressure regulating module, the input of the fourth electromagnetic pneumatic control module, and the sixth interface f of the ten-way valve;

[0012] The output of the third electromagnetic air circuit control module is connected to the air inlet.

[0013] Furthermore, a pressure regulating valve and a flow valve are also provided between the output end of the third electromagnetic air circuit control module and the air inlet air circuit.

[0014] Furthermore, the output terminal of the third electromagnetic pneumatic circuit control module is also connected in sequence to the seventh interface g of the detector, the main column, and the ten-way valve.

[0015] Furthermore, a pre-cutting column is connected between the fourth port d and the eighth port h of the ten-way valve, and a metering tube is connected between the third port c and the tenth port j of the ten-way valve.

[0016] Furthermore, the first port a of the ten-way valve is connected to the total hydrocarbon sample gas inlet and the sample inlet, the fifth port e of the ten-way valve is connected to the exhaust gas vent, and the second port b of the ten-way valve is connected to the sample gas vent.

[0017] Secondly, the present invention also provides a method for dynamic constant pressure control of hydrogen gas for chromatographs, which utilizes the aforementioned dynamic constant pressure control device for hydrogen gas for chromatographs and includes the following steps:

[0018] S1, the pressure regulating module group is initialized through the pressure regulating control module, setting the preset pressure values ​​for the pressure regulating chamber and each gas path, checking the operating status of the ten-way valve and the multi-stage electromagnetic gas path control module, and simultaneously setting the sampling period and set flow rate value of the flow sensor. Initialize the hydrogen supply valve and bypass pressure relief valve to the closed state;

[0019] S2, the pressure regulating control module monitors the pressure of the pressure regulating chamber in real time. When the pressure of the pressure regulating chamber is lower than the preset pressure, it controls the first pressure regulating module to open, so that hydrogen gas flows into the pressure regulating chamber from the hydrogen gas inlet; when the pressure of the pressure regulating chamber reaches or exceeds the preset pressure, it controls the first pressure regulating module to close, so as to isolate the hydrogen gas inlet from the pressure regulating chamber.

[0020] S3 continuously monitors the internal pressure of the multi-stage electromagnetic pneumatic control module through the pressure regulation control module, and controls the switching status of the second and third pressure regulation modules according to the pressure conditions.

[0021] S4, based on the internal pressure monitoring results of the gas circuit of the multi-stage electromagnetic gas circuit control module and the peak-shifting gas supply demand of the ten-way valve, hydrogen is supplied unidirectionally through the multi-stage electromagnetic gas circuit control module. When the ten-way valve switches the gas circuit, the pressure regulating control module adjusts the switching status of the first pressure regulating module, the second pressure regulating module and the third pressure regulating module in advance.

[0022] S5, based on the monitoring of the pressure in the pressure regulating chamber and each gas path, continuously monitors and dynamically adjusts the working status of the first pressure regulating module, the second pressure regulating module and the third pressure regulating module in real time through the pressure regulating control module.

[0023] Furthermore, it also includes S6, which sets the flow sensor sampling period and the set flow value based on S1. Real-time reading of the compensated traffic value As the actual flow value ,Will and Compare and adjust the on / off states of the hydrogen replenishment valve and the bypass pressure relief valve;

[0024] when At that time, open the hydrogen replenishment valve to replenish hydrogen until... rebounded to ;

[0025] when When necessary, open the bypass pressure relief valve to release pressure until... Falling back to ;

[0026] when At this time, maintain the current closed state of the hydrogen replenishment valve and the bypass pressure relief valve.

[0027] Furthermore, when the internal pressure of the gas path connected to the first electromagnetic gas path control module and the second electromagnetic gas path control module is greater than the preset pressure threshold, the pressure regulating control module controls the second pressure regulating module to open, allowing hydrogen gas in the gas path to flow into the pressure regulating chamber. When the pressure in the pressure regulating chamber exceeds the preset pressure, the first pressure regulating module is controlled to open, allowing excess hydrogen gas to flow back to the hydrogen inlet pipeline. When the internal pressure of the gas path is less than the preset pressure threshold, the pressure regulating control module controls the first pressure regulating module to open, allowing hydrogen gas to flow from the hydrogen inlet into the pressure regulating chamber, and then flow into the gas path through the second pressure regulating module.

[0028] Furthermore, when the internal pressure of the gas path connected to the first electromagnetic gas path control module and the fourth electromagnetic gas path control module is greater than the preset pressure threshold, the pressure regulating control module controls the third pressure regulating module to open, allowing hydrogen gas in the gas path to flow into the pressure regulating chamber. When the pressure in the pressure regulating chamber exceeds the preset pressure, the first pressure regulating module is controlled to open to return excess hydrogen gas to the hydrogen inlet pipeline. When the internal pressure of the gas path is less than the preset pressure threshold, the pressure regulating control module controls the first pressure regulating module to open, allowing hydrogen gas to flow from the hydrogen inlet into the pressure regulating chamber, and then flow into the gas path through the third pressure regulating module.

[0029] Compared with the prior art, the present invention has the following beneficial technical effects:

[0030] This invention provides a dynamic constant pressure control device for hydrogen gas in a chromatograph. Through the linkage mechanism of the pressure regulating chamber, the pressure regulating module, and the pressure regulating control module, the device coordinates the on / off of the hydrogen inlet, branch gas paths, and the pressure regulating chamber with the pressure regulating control module. When the ten-way valve and the multi-stage electromagnetic gas path control module switch alternately, the device adjusts the hydrogen pressure in a timely manner to avoid high or low pressure phenomena in the closed pipeline and ensure that the hydrogen pressure is stable at the optimal working value. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the gas path of a hydrogen dynamic constant pressure control device for a chromatograph according to an embodiment of the present invention. Figure 1 .

[0032] Figure 2 This is a schematic diagram of the gas path of a hydrogen dynamic constant pressure control device for a chromatograph according to an embodiment of the present invention. Figure 2 .

[0033] In the diagram: 1. Ten-way valve; 2. Identifier; 3. Air inlet; 4. Exhaust gas vent; 5. Sample gas vent; 6. Hydrogen inlet; 7. First electromagnetic gas path control module; 8. Second electromagnetic gas path control module; 9. Third electromagnetic gas path control module; 10. Fourth electromagnetic gas path control module; 11. Pressure regulator; 12. Flow valve; 13. Main column; 14. Pre-cut column; 15. Quantitative tube; 16. Total hydrocarbon sample gas inlet; 17. Sample inlet; 21. Pressure regulating chamber; 22. First pressure regulating module; 23. Second pressure regulating module; 24. Third pressure regulating module; a. First interface; b. Second interface; c. Third interface; d. Fourth interface; e. Fifth interface; f. Sixth interface; g. Seventh interface; h. Eighth interface; j. Tenth interface. Detailed Implementation

[0034] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0035] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0038] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0039] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0040] It should also be understood that the terminology used in this specification is for the purpose of describing particular embodiments only and is not intended to limit the invention. As used in this specification and the appended claims, the singular forms “a,” “an,” and “the” are intended to include the plural forms unless the context clearly indicates otherwise.

[0041] It should also be further understood that the term "and / or" as used in this specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0042] The accompanying drawings illustrate various structural schematic diagrams according to embodiments disclosed in this invention. These drawings are not to scale, and some details have been enlarged for clarity, and some details may have been omitted. The shapes of the various regions and layers shown in the drawings, as well as their relative sizes and positional relationships, are merely exemplary and may deviate from reality due to manufacturing tolerances or technical limitations. Furthermore, those skilled in the art can design regions / layers with different shapes, sizes, and relative positions as needed.

[0043] Existing chromatographs often suffer from unstable pressure during hydrogen supply, affecting the accuracy of chromatographic analysis results. Furthermore, traditional control devices have complex gas path connections and poor control module coordination, failing to achieve dynamic constant pressure regulation and thus unable to meet the demands of high-precision analysis. To address these issues, this invention provides the following technical solution.

[0044] Example 1

[0045] See Figures 1 to 2 In the diagram, dashed lines represent disconnections, and solid lines represent connections. This invention provides a dynamic constant pressure control device for hydrogen gas in a chromatograph, comprising a chromatograph body. The chromatograph body internally houses a ten-way valve 1, a multi-stage electromagnetic gas path control module, an integrated control module, a ten-way valve control module, a pressure regulating chamber 21, a pressure regulating module group, and a pressure regulating control module. The ten-way valve 1 is fixedly connected to the multi-stage electromagnetic gas path control module via a gas path pipeline. The pressure regulating chamber 21 is connected to the multi-stage electromagnetic gas path control module via a gas path pipeline. The multi-stage electromagnetic gas path control module is also connected to a hydrogen inlet 6 and an air inlet 3. The pressure regulating chamber 21 has a built-in flow sensor.

[0046] The pressure regulating module group includes a first pressure regulating module 22, a second pressure regulating module 23, and a third pressure regulating module 24, which are respectively connected to the pressure regulating chamber 21 via gas pipelines. All three are connected to the pressure regulating chamber 21 via gas pipelines, forming a multi-directional pressure interaction channel. The first pressure regulating module 22 is directly connected to the hydrogen inlet 6 and is used to control the on / off relationship between the external hydrogen source and the pressure regulating chamber 21. When the pressure in the pressure regulating chamber 21 is too low, the first pressure regulating module 22 is opened, allowing hydrogen to flow in to supplement the pressure. When the pressure reaches a set threshold, the first pressure regulating module 22 is closed to cut off the gas supply and prevent overpressure.

[0047] The first pressure regulating module 22 is also connected to a bypass pressure relief valve and a hydrogen replenishment valve; the bypass pressure relief valve is used to discharge excess gas to a safe area when the hydrogen dynamic constant pressure control device for the chromatograph is overpressurized, and the hydrogen replenishment valve can introduce additional hydrogen when the main gas supply is insufficient.

[0048] Both the pressure regulating control module and the ten-way valve control module are connected to the pressure regulating module group via signal lines. The pressure regulating control module communicates with the multi-stage electromagnetic pneumatic circuit control module. An authenticator 2 is connected between the multi-stage electromagnetic pneumatic circuit control module and the ten-way valve 1.

[0049] The ten-way valve 1 is a V-10 multi-channel valve. The V-10 multi-channel valve has a short switching response time of less than 0.5 seconds, enabling rapid gas path switching and meeting the timing requirements of chromatographic analysis. In practical applications, other models of the ten-way valve 1 can also be selected, and this embodiment does not limit this choice. The ten-way valve 1 is fixedly connected to the multi-stage electromagnetic gas path control module via gas pipelines, and the connection method is welding. The multi-stage electromagnetic gas path control module uses an EC-4 integrated electromagnetic control component, which reduces the number of gas pipeline connections and lowers the risk of leakage. In practical applications, other models of the multi-stage electromagnetic gas path control module can also be selected, and this embodiment does not limit this choice. The integrated control module uses an IC-200 microprocessor. This microprocessor has a fast calculation speed and can process signals from multiple modules simultaneously, ensuring the real-time performance of control commands. In practical applications, other models of the integrated control module can also be selected, and this embodiment does not limit this choice. The ten-way valve control module is connected to the ten-way valve 1 via a signal line. The flow sensor built into the pressure regulating chamber 21 is a miniature sensor of model FS-300. The first pressure regulating module 22, the second pressure regulating module 23, and the third pressure regulating module 24 in the pressure regulating module group are all pressure regulating valves of model PR-50, with a pressure regulating range of 0.1-1MPa and an adjustment accuracy of ±0.01MPa, which can achieve precise pressure regulation. In practical applications, other models can also be used in the pressure regulating module group, which is not limited in this embodiment. The bypass pressure relief valve and the hydrogen replenishment valve connected to the first pressure regulating module 22 are both solenoid valves. The detector 2 is a flame ionization detector, model FID-800, which has a low detection limit and high sensitivity, and can accurately detect the component content in the gas path. In practical applications, other models of detector 2 can also be selected, and this embodiment does not limit this. The detector 2 is connected to the multi-stage electromagnetic gas path control module and the ten-way valve 1 through the gas path pipeline, and the connection method is threaded connection. Both the hydrogen inlet 6 and the air inlet 3 use quick connectors, model QC-8, to facilitate quick connection and disassembly of the gas path. In practical applications, other models of quick connectors can also be selected, and this embodiment does not limit this.

[0050] Working principle:

[0051] The integrated control module provides core control support for the entire hydrogen dynamic constant pressure control device for the chromatograph. The ten-way valve control module controls the gas path switching of the ten-way valve 1 according to the analytical requirements. The pressure regulating control module receives signals from the multi-stage electromagnetic gas path control module and the flow sensor in the pressure regulating chamber 21 in real time, and issues control commands to the pressure regulating module group to adjust the working status of each pressure regulating module. Hydrogen enters from the hydrogen inlet 6, and after being distributed by the multi-stage electromagnetic gas path control module, part of it enters the pressure regulating chamber 21, and the other part flows to the ten-way valve 1 through the corresponding gas path. Air enters from the air inlet 3 into the multi-stage electromagnetic gas path control module and participates in the analysis process in conjunction with hydrogen. The identifier 2 detects and analyzes the components in the gas path.

[0052] This embodiment provides a dynamic constant pressure control device for hydrogen gas in a chromatograph, which achieves dynamic constant pressure control of hydrogen supply, ensuring the stability of the gas path pressure of the chromatograph and improving the accuracy of chromatographic analysis results.

[0053] Example 2

[0054] The existing multi-stage electromagnetic gas path control module has an unclear internal structure and chaotic gas path connection relationship, resulting in insufficient precision in the distribution control of hydrogen and air, which affects the analytical efficiency of the chromatograph. Based on Example 1, this example further describes a specific implementation method for a dynamic constant pressure control device for hydrogen in a chromatograph.

[0055] The multi-stage electromagnetic gas path control module includes a first electromagnetic gas path control module 7, a second electromagnetic gas path control module 8, a third electromagnetic gas path control module 9, and a fourth electromagnetic gas path control module 10. The input terminal of the first electromagnetic gas path control module 7 is connected to the hydrogen inlet 6, and the output terminal of the first electromagnetic gas path control module 7 is sequentially connected to the second pressure regulating module 23, the input terminal of the second electromagnetic gas path control module 8, the input terminal of the third electromagnetic gas path control module 9, the input terminal of the fourth electromagnetic gas path control module 10, and the sixth interface f of the ten-way valve 1. The output terminal of the first electromagnetic gas path control module 7 is also sequentially connected to the third pressure regulating module 24, the input terminal of the fourth electromagnetic gas path control module 10, and the sixth interface f of the ten-way valve 1. The output terminal of the third electromagnetic gas path control module 9 is connected to the air inlet 3.

[0056] Working principle: Hydrogen enters the first electromagnetic gas path control module 7 through hydrogen inlet 6. After the first electromagnetic gas path control module 7 performs preliminary control on the hydrogen, a portion of the hydrogen passes sequentially through the second pressure regulating module 23, the second electromagnetic gas path control module 8, the third electromagnetic gas path control module 9, and the fourth electromagnetic gas path control module 10, and finally flows to the sixth port f of the ten-way valve 1; another portion of the hydrogen passes sequentially through the third pressure regulating module 24 and the fourth electromagnetic gas path control module 10, and flows to the sixth port f of the ten-way valve 1; air enters the third electromagnetic gas path control module 9 through air inlet 3, and under the control of the third electromagnetic gas path control module 9, it enters the subsequent gas path together with the hydrogen.

[0057] In this embodiment, the internal composition of the multi-level electromagnetic gas path control module and the gas path connection relationship between each module are clearly defined, realizing the precise distribution and control of hydrogen and air, and avoiding control errors caused by gas path chaos.

[0058] In a more preferred embodiment of the present invention, a pressure regulating valve 11 and a flow valve 12 are further provided between the output end of the third electromagnetic gas path control module 9 and the gas path of the air inlet 3. After the air enters from the air inlet 3, it first passes through the flow valve 12, and the air flow is adjusted according to the chromatographic analysis requirements. Then it passes through the pressure regulating valve 11, which stabilizes the air pressure within the set range, and then enters the third electromagnetic gas path control module 9. Under the control of the third electromagnetic gas path control module 9, it enters the subsequent gas path and participates in the analysis process in conjunction with hydrogen.

[0059] In a more preferred embodiment of the present invention, the output terminal of the third electromagnetic gas path control module 9 is also sequentially connected to the detector 2, the main column 13, and the seventh interface g of the ten-way valve 1. The gas path output by the third electromagnetic gas path control module 9, containing a mixture of hydrogen and air or a single gas, first enters the detector 2, where the detector 2 performs preliminary detection on the target components in the gas path. Then, the gas path enters the main column 13, where the main column 13 separates the target components in the gas path. The separated target components flow through the gas path to the seventh interface g of the ten-way valve 1, and after entering the ten-way valve 1, they participate in the subsequent gas path switching and analysis process.

[0060] In a more preferred embodiment of the present invention, a pre-cutting column 14 is connected between the fourth port d and the eighth port h of the ten-way valve 1, and a metering tube 15 is connected between the third port c and the tenth port j of the ten-way valve 1. The pre-cutting column 14 is used to remove interfering components in the sample gas, and the metering tube 15 ensures the accuracy of the injection volume.

[0061] When the sample gas enters the ten-way valve 1, it first flows through the quantitative tube 15, which precisely captures a fixed volume of sample gas, achieving quantitative injection. Subsequently, the quantified sample gas enters the pre-cutting column 14, which traps interfering components, allowing only the target component to pass through. The pre-separated target component then enters the main column 13 for further separation, and is finally detected by the identifier 2. The ten-way valve 1 switches between the quantitative tube 15 injection, the pre-cutting column 14 separation, and the main column 13 separation processes by changing the interface connection.

[0062] In a more preferred embodiment of the present invention, the first port a of the ten-way valve 1 is connected to the total hydrocarbon sample gas inlet 16 and the sample inlet 17, the fifth port e of the ten-way valve 1 is connected to the exhaust gas vent 4, and the second port b of the ten-way valve 1 is connected to the sample gas vent 5. The total hydrocarbon sample gas enters the ten-way valve 1 through the first port a via the first port a, and the ordinary sample gas enters the ten-way valve 1 through the total hydrocarbon sample gas inlet 16 and the sample gas through the sample inlet 17, either mixed or separately. During the switching process of the ten-way valve 1, excess sample gas that is not involved in the analysis flows to the sample gas vent 5 through the second port b of the ten-way valve 1 and is discharged. The exhaust gas generated during the analysis flows to the exhaust gas vent 4 through the fifth port e of the ten-way valve 1 and is discharged, ensuring that there is no gas retention inside the gas path.

[0063] Example 3

[0064] This invention also provides a method for dynamic constant pressure control of hydrogen gas for chromatographs, which, using the aforementioned dynamic constant pressure control device for hydrogen gas for chromatographs, specifically includes the following steps:

[0065] S1, initialize the pressure regulating module group through the pressure regulating control module, set the preset pressure values ​​of the pressure regulating chamber 21 and each gas path, check the operating status of the ten-way valve 1 and the multi-stage electromagnetic gas path control module, and set the sampling period and set flow value of the flow sensor. Initialize the hydrogen supply valve and bypass pressure relief valve to the closed state;

[0066] S2, the pressure regulating control module monitors the pressure of the pressure regulating chamber 21 in real time. When the pressure of the pressure regulating chamber 21 is lower than the preset pressure, it controls the first pressure regulating module 22 to open, so that hydrogen gas flows into the pressure regulating chamber 21 from the hydrogen gas inlet 6. When the pressure of the pressure regulating chamber 21 reaches or exceeds the preset pressure, it controls the first pressure regulating module 22 to close, so as to isolate the hydrogen gas inlet 6 from the pressure regulating chamber 21.

[0067] S3, continuously monitors the internal pressure of the multi-stage electromagnetic pneumatic control module through the pressure regulation control module, and controls the switching status of the second pressure regulation module 23 and the third pressure regulation module 24 according to the pressure conditions;

[0068] S4, based on the gas circuit internal pressure monitoring results of the multi-level electromagnetic gas circuit control module and the peak-shifting gas supply demand of the ten-way valve 1, hydrogen is supplied unidirectionally through the multi-level electromagnetic gas circuit control module. When the ten-way valve 1 switches the gas circuit, the pressure regulating control module adjusts the switching status of the first pressure regulating module 22, the second pressure regulating module 23 and the third pressure regulating module 24 in advance.

[0069] S5, based on the monitoring of the pressure of the pressure regulating chamber 21 and each gas path, the working status of the first pressure regulating module 22, the second pressure regulating module 23 and the third pressure regulating module 24 are continuously monitored and dynamically adjusted in real time through the pressure regulating control module.

[0070] In a more preferred embodiment of the present invention, S6 is further included, which is based on the flow sensor sampling period and the set flow value set in S1. Real-time reading of the compensated traffic value As the actual flow value ,Will and Compare and adjust the on / off states of the hydrogen replenishment valve and the bypass pressure relief valve;

[0071] when At that time, open the hydrogen replenishment valve to replenish hydrogen until... rebounded to ;

[0072] when When necessary, open the bypass pressure relief valve to release pressure until... Falling back to ;

[0073] when At this time, maintain the current closed state of the hydrogen replenishment valve and the bypass pressure relief valve.

[0074] Among them, the flow sensor sampling period and set flow value are based on S1. This refers to the fact that during the initialization phase of the hydrogen dynamic constant pressure control device for the chromatograph, the pressure regulation control module has been configured with the time interval for collecting flow data, i.e., the sampling period, and the target gas supply flow rate, i.e., the set flow rate value. ,Should The amount of hydrogen consumed is determined based on the amount of hydrogen required for the normal operation of the chromatograph identifier 2, and is usually the minimum effective flow rate required to ensure stable combustion of the flame ionization detector.

[0075] In a more preferred embodiment of the present invention, when the internal pressure of the gas path connected to the first electromagnetic gas path control module 7 and the second electromagnetic gas path control module 8 is greater than a preset pressure threshold, the pressure regulating control module controls the second pressure regulating module 23 to open, allowing hydrogen gas in the gas path to flow into the pressure regulating chamber 21. When the pressure in the pressure regulating chamber 21 exceeds the preset pressure, the first pressure regulating module 22 is controlled to open, allowing excess hydrogen gas to flow back to the hydrogen inlet 6 pipeline. When the internal pressure of the gas path is less than the preset pressure threshold, the pressure regulating control module controls the first pressure regulating module 22 to open, allowing hydrogen gas to flow from the hydrogen inlet 6 into the pressure regulating chamber 21, and then flow into the gas path through the second pressure regulating module 23.

[0076] This embodiment provides a dynamic pressure regulation mechanism for the gas path connecting the first electromagnetic gas path control module 7 and the second electromagnetic gas path control module 8. A second pressure regulating module 23 is installed in the gas path between the pressure regulating chamber 21 and the first and second electromagnetic gas path control modules 7 and 8. The on / off state of the second pressure regulating module 23 is controlled by the pressure regulating control module via a signal line. When the pressure in this gas path is detected to be higher than a preset pressure threshold, the pressure regulating control module outputs an opening command, and the second pressure regulating module 23 is turned on, allowing some high-pressure hydrogen to flow into the pressure regulating chamber 21, acting as a pressure relief buffer. During this process, the pressure regulating chamber 21 acts as a temporary gas storage cavity with a certain volumetric buffering capacity. The internal pressure of the pressure regulating chamber 21 is also continuously monitored by a built-in flow sensor. If the pressure in the pressure regulating chamber 21 rises and exceeds its upper limit threshold, the pressure regulating control module further triggers the first pressure regulating module 22 to open, causing excess hydrogen to flow back to the input pipeline where the hydrogen inlet 6 is located.

[0077] Conversely, when the pressure in the gas pipeline between the first electromagnetic gas path control module 7 and the second electromagnetic gas path control module 8 is lower than the preset pressure threshold, it indicates that there is a pressure deficit in this section of the gas path, which may affect the stability of subsequent gas supply. At this time, the pressure regulating control module activates the compensation mechanism: first, the first pressure regulating module 22 is opened, allowing fresh hydrogen to enter the pressure regulating chamber 21 from the hydrogen inlet 6. After the pressure in the pressure regulating chamber is established, the second pressure regulating module 23 is then opened, allowing hydrogen to replenish the low-pressure area through the pressure regulating chamber 21, gradually restoring the target pressure level.

[0078] Through the above technical solution, this application achieves bidirectional pressure regulation of the gas path between the first electromagnetic gas path control module 7 and the second electromagnetic gas path control module 8 under transient pressure disturbances caused by the switching of the ten-way valve. Due to the implementation of a dual-mode control logic based on pressure threshold judgment: at high pressure, the gas is introduced into the pressure regulating chamber 21 through the second pressure regulating module 23 and supplemented by the return flow from the first pressure regulating module 22; at low pressure, the pressure is replenished by sequentially opening the first pressure regulating module 22 and the second pressure regulating module 23. This effectively solves the overpressure or underpressure problems that may occur during the alternating operation of this gas path.

[0079] In a more preferred embodiment of the present invention, when the internal pressure of the gas path connected to the first electromagnetic gas path control module 7 and the fourth electromagnetic gas path control module 10 is greater than a preset pressure threshold, the pressure regulating control module controls the third pressure regulating module 24 to open, allowing hydrogen gas in the gas path to flow into the pressure regulating chamber 21. When the pressure in the pressure regulating chamber 21 exceeds the preset pressure, the first pressure regulating module 22 is controlled to open, allowing excess hydrogen gas to flow back to the hydrogen inlet 6 pipeline. When the internal pressure of the gas path is less than the preset pressure threshold, the pressure regulating control module controls the first pressure regulating module 22 to open, allowing hydrogen gas to flow from the hydrogen inlet 6 into the pressure regulating chamber 21, and then flow into the gas path through the third pressure regulating module 24.

[0080] Through the above technical solution, this application achieves precise pressure regulation of the connecting airway between the first electromagnetic airway control module 7 and the fourth electromagnetic airway control module 10 under complex operating conditions where the periodic switching of the ten-way valve causes airway pressure fluctuations. Because a pressure regulating chamber 21 is set up as an intermediate buffer, and through the linkage control of the first pressure regulating module 22 and the third pressure regulating module 24, pressure can be released promptly when the pressure is too high and pressure can be quickly replenished when the pressure is insufficient, effectively suppressing pressure anomalies caused by airway closure or suction effects.

[0081] In this invention, the pressure regulating chamber can absorb excess gas at high pressure and replenish gas in the reverse direction at low pressure, which effectively suppresses the pressure change in the closed pipeline during the switching of the ten-way valve 1, solves the problem of pressure imbalance in the quantitative tube 15 caused by hydrogen pressure fluctuation, thereby avoiding the measurement deviation of the detector and baseline drift, and significantly improving the analytical accuracy and operational stability of the chromatograph.

[0082] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the present invention as claimed. The scope of protection of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for dynamic constant pressure control of hydrogen gas in a chromatograph, characterized in that, A dynamic constant pressure control device for hydrogen gas in a chromatograph is used to achieve this. The dynamic constant pressure control device for hydrogen gas in a chromatograph includes a chromatograph body. The chromatograph body is internally connected to a ten-way valve (1), a multi-stage electromagnetic gas path control module, an integrated control module, a ten-way valve control module, a pressure regulating chamber (21), a pressure regulating module group, and a pressure regulating control module. The ten-way valve (1) is fixedly connected to the multi-stage electromagnetic gas path control module through a gas path pipeline. The pressure regulating chamber (21) is connected to the multi-stage electromagnetic gas path control module through a gas path pipeline. The multi-stage electromagnetic gas path control module is also connected to a hydrogen inlet (6) and an air inlet (3). The pressure regulating chamber (21) has a built-in flow sensor. The pressure regulating module group includes a first pressure regulating module (22), a second pressure regulating module (23) and a third pressure regulating module (24) that are respectively connected to the pressure regulating chamber (21) through gas pipelines. The first pressure regulating module (22) is connected to the hydrogen inlet (6) and is also connected to a bypass pressure relief valve and a hydrogen replenishment valve. The pressure regulating control module and the ten-way valve control module are both connected to the pressure regulating module group via signal lines. The pressure regulating control module communicates with the multi-stage electromagnetic air circuit control module. An identifier (2) is connected between the multi-stage electromagnetic air circuit control module and the ten-way valve (1). The method Includes the following steps: S1, initialize the pressure regulating module group through the pressure regulating control module, set the preset pressure values ​​of the pressure regulating chamber (21) and each gas path, check the operating status of the ten-way valve (1) and the multi-stage electromagnetic gas path control module, and set the sampling period and set flow value of the flow sensor. Initialize the hydrogen supply valve and bypass pressure relief valve to the closed state; S2, the pressure regulating control module monitors the pressure of the pressure regulating chamber (21) in real time. When the pressure of the pressure regulating chamber (21) is lower than the preset pressure, it controls the first pressure regulating module (22) to open, so that hydrogen gas flows into the pressure regulating chamber (21) from the hydrogen gas inlet (6); when the pressure of the pressure regulating chamber (21) reaches or exceeds the preset pressure, it controls the first pressure regulating module (22) to close, so as to isolate the hydrogen gas inlet (6) from the pressure regulating chamber (21). S3, continuously monitor the internal pressure of the multi-stage electromagnetic gas circuit control module through the pressure regulation control module, and control the switching status of the second pressure regulation module (23) and the third pressure regulation module (24) according to the pressure situation; S4, based on the gas circuit internal pressure monitoring results of the multi-level electromagnetic gas circuit control module and the peak gas supply demand of the ten-way valve (1), hydrogen is supplied unidirectionally through the multi-level electromagnetic gas circuit control module. When the ten-way valve (1) switches the gas circuit, the pressure regulating control module adjusts the switching status of the first pressure regulating module (22), the second pressure regulating module (23) and the third pressure regulating module (24) in advance. S5, based on the monitoring of the pressure of the pressure regulating chamber (21) and each gas path, the working status of the first pressure regulating module (22), the second pressure regulating module (23) and the third pressure regulating module (24) are continuously monitored and dynamically adjusted in real time by the pressure regulating control module.

2. The method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 1, characterized in that, The multi-level electromagnetic air circuit control module includes a first electromagnetic air circuit control module (7), a second electromagnetic air circuit control module (8), a third electromagnetic air circuit control module (9), and a fourth electromagnetic air circuit control module (10). The input end of the first electromagnetic gas path control module (7) is connected to the hydrogen inlet (6), and the output end of the first electromagnetic gas path control module (7) is connected in sequence to the second pressure regulating module (23), the input end of the second electromagnetic gas path control module (8), the input end of the third electromagnetic gas path control module (9), the input end of the fourth electromagnetic gas path control module (10), and the sixth port (f) of the ten-way valve (1). The output of the first electromagnetic air circuit control module (7) is also connected in sequence to the third pressure regulating module (24), the input of the fourth electromagnetic air circuit control module (10), and the sixth interface (f) of the ten-way valve (1). The output of the third electromagnetic air circuit control module (9) is connected to the air inlet (3).

3. The method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 2, characterized in that, A pressure regulating valve (11) and a flow valve (12) are also provided between the output end of the third electromagnetic air circuit control module (9) and the air circuit of the air inlet (3).

4. The method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 3, characterized in that, The output of the third electromagnetic pneumatic control module (9) is also connected in sequence to the seventh interface (g) of the detector (2), the main column (13), and the ten-way valve (1).

5. The method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 4, characterized in that, A pre-cutting column (14) is connected between the fourth port (d) and the eighth port (h) of the ten-way valve (1), and a metering tube (15) is connected between the third port (c) and the tenth port (j) of the ten-way valve (1).

6. The method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 4, characterized in that, The first port (a) of the ten-way valve (1) is connected to the total hydrocarbon sample gas inlet (16) and the sample inlet (17), the fifth port (e) of the ten-way valve (1) is connected to the exhaust gas vent (4), and the second port (b) of the ten-way valve (1) is connected to the sample gas vent (5).

7. The method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 6, characterized in that, It also includes S6, which sets the flow sensor sampling period and set flow value based on S1. Real-time reading of the compensated traffic value As the actual flow value ,Will and Compare and adjust the on / off states of the hydrogen replenishment valve and the bypass pressure relief valve; when At that time, open the hydrogen replenishment valve to replenish hydrogen until... rebounded to ; when When necessary, open the bypass pressure relief valve to release pressure until... Falling back to ; when At this time, maintain the current closed state of the hydrogen replenishment valve and the bypass pressure relief valve.

8. The method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 7, characterized in that, When the pressure inside the gas path connected to the first electromagnetic gas path control module (7) and the second electromagnetic gas path control module (8) is greater than the preset pressure threshold, the pressure regulating control module controls the second pressure regulating module (23) to open, so that hydrogen in the gas path flows into the pressure regulating chamber (21). When the pressure in the pressure regulating chamber (21) exceeds the preset pressure, the first pressure regulating module (22) is controlled to open to return excess hydrogen to the hydrogen inlet (6) pipeline. When the pressure inside the gas path is less than the preset pressure threshold, the pressure regulating control module controls the first pressure regulating module (22) to open, and hydrogen flows from the hydrogen inlet (6) into the pressure regulating chamber (21), and then flows to the gas path through the second pressure regulating module (23).

9. A method for dynamic constant pressure control of hydrogen gas for a chromatograph according to claim 8, characterized in that, When the pressure inside the gas path connected to the first electromagnetic gas path control module (7) and the fourth electromagnetic gas path control module (10) is greater than the preset pressure threshold, the pressure regulating control module controls the third pressure regulating module (24) to open, so that hydrogen in the gas path flows into the pressure regulating chamber (21). When the pressure in the pressure regulating chamber (21) exceeds the preset pressure, the first pressure regulating module (22) is controlled to open to return excess hydrogen to the hydrogen inlet (6) pipeline. When the pressure inside the gas path is less than the preset pressure threshold, the pressure regulating control module controls the first pressure regulating module (22) to open, and hydrogen flows from the hydrogen inlet (6) into the pressure regulating chamber (21), and then flows into the gas path through the third pressure regulating module (24).

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