Chromatograph hydrogen closed-loop circulation control device and method

Abstract

The invention discloses a chromatographic instrument hydrogen closed-loop circulation control device and method, and relates to the technical field of hydrogen flame chromatographic instruments, the chromatographic instrument hydrogen closed-loop circulation control device comprises a chromatographic instrument main body, and a ten-way valve, a multi-stage electromagnetic gas circuit control module, an integrated control module and a ten-way valve control module are fixedly mounted in the chromatographic instrument main body; the ten-way valve is fixedly connected with the multi-stage electromagnetic gas circuit control module through the gas circuit pipeline group, the gas circuit pipeline group comprises a hydrogen pipeline and an air pipeline, the hydrogen pipeline introduces hydrogen into the multi-stage electromagnetic gas circuit control module, and the air pipeline introduces air into the multi-stage electromagnetic gas circuit control module and the ten-way valve; the ten-way valve is also connected with a component identifier; the integrated control module is in electric signal connection with the multi-stage electromagnetic gas circuit control module and controls the ten-way valve control module, and the integrated control module is used for controlling the multi-stage electromagnetic gas circuit control module and the ten-way valve control module. According to the method, hydrogen can be recycled, the safety risk is reduced, and the real-time performance of formation gas analysis is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of hydrogen flame chromatograph, and in particular to a chromatograph hydrogen closed loop circulation control device and method. BACKGROUND

[0002] In oil exploration and development operations, real-time monitoring of formation gas is the core means of identifying oil and gas shows. At present, the mainstream hydrogen flame chromatograph at home and abroad uses hydrogen flame ionization detection technology to quantitatively analyze hydrocarbon components in formation gas. Its principle is to use high-temperature flame to burn separated hydrocarbons, and determine the oil and gas content by detecting ion current intensity. The device needs to supply hydrogen, air and sample gas (i.e. formation gas) at the same time to maintain the normal operation of the detection system.

[0003] To adapt to the needs of modern fast drilling operations, the fast analysis chromatograph uses a ten-way valve shunt technology to divide the sample gas into two paths and alternately transport it to the component identifier to achieve efficient continuous analysis. However, this design has a significant technical bottleneck: because heavy hydrocarbon components have strong adsorption, they are easily left in the ten-way valve, so after each analysis, back flushing must be performed. The existing gas path system is limited by the design architecture and can only use hydrogen as the back flushing medium. The hydrogen-containing waste gas after cleaning is directly discharged to the outside of the instrument. This operation not only significantly increases hydrogen consumption, but also poses a major safety hazard in the discharge area due to the flammable and explosive nature of hydrogen. If it leaks and accumulates, it can easily cause fire and explosion accidents.

[0004] Due to safety regulations, the hydrogen flame chromatograph must be at least 30 meters away from the wellhead and cannot be deployed at key monitoring points such as the drilling fluid outlet. This limitation causes a delay in formation gas analysis data, affecting the timeliness of exploration decisions; at the same time, being away from the monitoring source also weakens the device's response to sudden abnormal situations, posing a potential threat to drilling safety. SUMMARY

[0005] The purpose of the present application is to provide a chromatograph hydrogen closed loop circulation control device and method, which can realize hydrogen reuse, reduce safety risks and improve the real-time analysis of formation gas to solve the problems of hydrogen waste, high safety risk and delayed data monitoring of the existing hydrogen flame chromatograph.

[0006] In order to achieve the above purpose, the present application provides the following technical solutions: In a first aspect, the present application provides a chromatograph hydrogen closed loop circulation control device, comprising a chromatograph main body, a ten-way valve, a multi-stage electromagnetic gas path control module, an integrated control module and a ten-way valve control module are fixedly installed inside the chromatograph main body. The ten-way valve is fixedly connected with a gas path pipeline set and a multi-stage electromagnetic gas path control module, the gas path pipeline set includes a hydrogen pipeline and an air pipeline, the hydrogen pipeline introduces hydrogen into the multi-stage electromagnetic gas path control module, and the air pipeline introduces air into the multi-stage electromagnetic gas path control module and the ten-way valve; the ten-way valve is further connected with a component identifier; The integrated control module is electrically connected with the multi-stage electromagnetic gas path control module and the ten-way valve control module, and is used for controlling the multi-stage electromagnetic gas path control module to switch the gas path and controlling the ten-way valve control module to adjust the working mode of the ten-way valve.

[0007] Further, the multi-stage electromagnetic gas path control module includes a first electromagnetic gas path control module, a second electromagnetic gas path control module, a third electromagnetic gas path control module and a fourth electromagnetic gas path control module. The air inlet is communicated with the air inlet of the third electromagnetic gas path control module. The air inlet is communicated with the air inlet of the third electromagnetic gas path control module.

[0008] Further, a pressure stabilizing valve and a flow valve are sequentially arranged on the air pipeline between the air inlet and the third electromagnetic gas path control module; after passing through the pressure stabilizing valve and the flow valve, the air pipeline is branched into two branches, one branch is communicated with the air inlet of the third electromagnetic gas path control module, and the other branch is communicated with the air inlet of the main column, and the air outlet of the main column is communicated with the ten-way valve.

[0009] Further, the air outlet of the second electromagnetic gas path control module is communicated with the ninth interface of the ten-way valve, and the air outlet of the fourth electromagnetic gas path control module is communicated with the sixth interface of the ten-way valve; under the control of the integrated control module, the first electromagnetic gas path control module supplies hydrogen to the second electromagnetic gas path control module and the fourth electromagnetic gas path control module in a staggered peak mode, and the third electromagnetic gas path control module supplies air to the second electromagnetic gas path control module and the fourth electromagnetic gas path control module in a staggered peak mode.

[0010] Further, the ten-way valve is further provided with a waste gas vent, the chromatograph main body is further provided with the component identifier, and the component identifier is fixedly installed between the third electromagnetic gas path control module and the air inlet of the main column.

[0011] Further, the first interface of the ten-way valve is connected with a total hydrocarbon sample gas input port and a sample inlet, and the second interface of the ten-way valve is connected with a sample gas vent.

[0012] Further, the third interface of the ten-way valve is connected with the tenth interface of the ten-way valve, and the fourth interface of the ten-way valve is connected with the eighth interface of the ten-way valve.

[0013] In a second aspect, the present application further provides a chromatograph hydrogen closed loop circulation control method, which applies the chromatograph hydrogen closed loop circulation control device, and comprises the following steps: The integrated control module reads the preset working parameters, detects the hydrogen source pressure, the air source pressure, the opening and closing state of the electromagnetic valve in the multi-stage electromagnetic gas circuit control module, and the ten-way valve sensor signal, and confirms whether the device meets the safe starting condition; After the device meets the safe starting condition, the integrated control module divides the analysis period into two equal time periods, and performs time sequence distribution on the gas circuit on-off state of the multi-stage electromagnetic gas circuit control module, so that the multi-stage electromagnetic gas circuit control module is switched between mode one and mode two.

[0014] Further, when the ten-way valve is in mode one, the integrated control module controls the gas circuit conduction between the first electromagnetic gas circuit control module and the second electromagnetic gas circuit control module, and the gas circuit conduction between the third electromagnetic gas circuit control module and the fourth electromagnetic gas circuit control module; Meanwhile, the gas circuit between the first electromagnetic gas circuit control module and the fourth electromagnetic gas circuit control module is closed, and the gas circuit between the third electromagnetic gas circuit control module and the second electromagnetic gas circuit control module is closed.

[0015] Further, when the ten-way valve is in mode two, the integrated control module controls the gas circuit conduction between the first electromagnetic gas circuit control module and the fourth electromagnetic gas circuit control module, and the gas circuit conduction between the third electromagnetic gas circuit control module and the second electromagnetic gas circuit control module, and controls the gas circuit between the first electromagnetic gas circuit control module and the second electromagnetic gas circuit control module to be closed, and the gas circuit between the third electromagnetic gas circuit control module and the fourth electromagnetic gas circuit control module to be closed.

[0016] Compared with the prior art, the present application has the following beneficial technical effects: The application provides a chromatograph hydrogen closed loop circulation control device, a multi-stage electromagnetic gas path control module and a ten-way valve control module are connected through electric signals by an integrated control module, a unified control center is constructed, gas path switching and ten-way valve working mode are realized, hydrogen can be recycled through directional transmission of the multi-stage electromagnetic gas path control module, waste caused by direct discharge of hydrogen in traditional technologies is avoided, hydrogen consumption and operation cost are reduced, air is supported to replace hydrogen as back flushing medium, air is transported to the ten-way valve through an air pipeline, fire and explosion safety hazards caused by hydrogen-containing waste gas discharge accumulation are completely eliminated, and equipment operation safety is improved. BRIEF DESCRIPTION OF DRAWINGS

[0017] Fig. 1 It is a gas path schematic diagram of a chromatograph hydrogen closed loop circulation control device mode one in the embodiment of the application.

[0018] Fig. 2 It is a gas path schematic diagram of a chromatograph hydrogen closed loop circulation control device mode two in the embodiment of the application.

[0019] In the figure, 1 is a ten-way valve, 2 is a component identifier, 3 is an air inlet, 4 is a waste gas vent, 5 is a sample gas vent, 6 is a hydrogen inlet, 7 is a first electromagnetic gas path control module, 8 is a second electromagnetic gas path control module, 9 is a third electromagnetic gas path control module, 10 is a fourth electromagnetic gas path control module, 11 is a pressure stabilizing valve, 12 is a flow valve, 13 is a main column, 14 is a pre-cut column, 15 is a constant volume tube, 16 is a total hydrocarbon sample gas input port, 17 is a sample inlet, a is a first interface, b is a second interface, c is a third interface, d is a fourth interface, f is a sixth interface, h is an eighth interface, i is a ninth interface, and j is a tenth interface. DETAILED DESCRIPTION

[0020] In the following, only certain exemplary embodiments are simply described. As those skilled in the art can recognize, the described embodiments can be modified in various different ways without departing from the spirit or scope of the application. Therefore, the drawings and the description are considered to be exemplary in nature rather than limiting.

[0021] In the description of the application, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more of the features. In the description of the application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.

[0022] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection, and can also be communication; can be direct connection, or indirect connection through an intermediate medium, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] It should be understood that when used in the present specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, integers, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or sets thereof.

[0024] Various structural diagrams according to the disclosed embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, in which certain details are exaggerated for the purpose of clear expression, and certain details can be omitted. The shapes of various regions, layers shown in the drawings and their relative size, positional relationship can deviate in actuality due to manufacturing tolerances or technical limitations, and a person skilled in the art can additionally design regions / layers with different shapes, sizes, relative positions according to actual needs.

[0025] Embodiment 1 The present application provides a chromatograph hydrogen closed loop circulation control device, which effectively solves the problems of hydrogen waste, safety hazards and data monitoring delay of existing equipment through innovative gas path control architecture and collaborative control mechanism. The specific technical solutions are as follows: It comprises a chromatograph main body, wherein a ten-way valve 1, a multi-stage electromagnetic gas path control module, an integrated control module and a ten-way valve control module are fixedly installed inside the chromatograph main body. The ten-way valve 1 is fixedly connected with the gas path pipeline group and the multi-stage electromagnetic gas path control module. The gas path pipeline group comprises a hydrogen pipeline and an air pipeline. The hydrogen pipeline introduces hydrogen into the multi-stage electromagnetic gas path control module, and the air pipeline introduces air into the multi-stage electromagnetic gas path control module and the ten-way valve 1. The ten-way valve 1 is also connected with a component identifier 2. The integrated control module is electrically connected with the multi-stage electromagnetic gas path control module and the ten-way valve control module, and is used for controlling the multi-stage electromagnetic gas path control module to switch the gas path and controlling the ten-way valve control module to adjust the working mode of the ten-way valve 1.

[0026] In the embodiment, the hydrogen introduced by the gas pipeline can be transmitted in the closed gas circuit formed by the multi-stage electromagnetic gas circuit control module and the ten-way valve 1. The integrated control module controls the multi-stage electromagnetic gas circuit control module to switch the gas circuit, so that the hydrogen does not need to be directly discharged after back flushing as in the prior art, but forms a circulating transmission path inside the device, avoids the waste caused by the discharge of hydrogen after single use, greatly reduces the hydrogen consumption, and thus overcomes the large hydrogen waste of the existing hydrogen flame chromatograph.

[0027] In the embodiment, the integrated control module controls the multi-stage electromagnetic gas circuit control module to switch the back flushing gas source, and replaces the traditional hydrogen back flushing with air back flushing: the air introduced by the gas pipeline enters the multi-stage electromagnetic gas circuit control module, and under the regulation of the integrated control module, the air replaces the hydrogen to become the back flushing medium, avoiding the discharge of hydrogen-containing waste gas to the outside of the instrument; thus overcoming the safety hazard of hydrogen leakage and fire explosion caused by using hydrogen as the back flushing medium and directly discharging hydrogen-containing waste gas in the prior art.

[0028] Embodiment 2 Referring to Figs. 1-2 , the dashed line in the Fig. 1 and Fig. 2 is disconnected, and the solid line is connected, and based on the embodiment 1, the multi-stage electromagnetic gas circuit control module is further described in the embodiment: In the embodiment, the multi-stage electromagnetic gas circuit control module is modularized and split, including the first electromagnetic gas circuit control module 7, the second electromagnetic gas circuit control module 8, the third electromagnetic gas circuit control module 9 and the fourth electromagnetic gas circuit control module 10 connected in sequence through the gas pipeline.

[0029] The gas inlet end of the first electromagnetic gas circuit control module 7 is communicated with the hydrogen inlet 6, and the gas outlet end of the first electromagnetic gas circuit control module 7 is communicated with the gas inlet end of the second electromagnetic gas circuit control module 8 and the fourth electromagnetic gas circuit control module 10 respectively; The gas inlet end of the third electromagnetic gas circuit control module 9 is communicated with the second electromagnetic gas circuit control module 8, and the gas outlet end of the third electromagnetic gas circuit control module 9 is communicated with the fourth electromagnetic gas circuit control module 10; and the gas inlet end of the third electromagnetic gas circuit control module 9 is also communicated with the air inlet 3.

[0030] In a more preferred embodiment of the present application, the gas outlet end of the second electromagnetic gas circuit control module 8 is communicated with the ninth interface i of the ten-way valve 1, and the gas outlet end of the fourth electromagnetic gas circuit control module 10 is communicated with the sixth interface f of the ten-way valve 1.

[0031] After the chromatograph gas circuit control device capable of realizing hydrogen circulation and synchronous cleaning is started: Hydrogen transmission path: External hydrogen enters the first electromagnetic gas path control module 7 through hydrogen inlet 6. The integrated control module sends instructions to the first electromagnetic gas path control module 7 via electrical signals, controlling the first electromagnetic gas path control module 7 to selectively connect the gas path with the second electromagnetic gas path control module 8 or the fourth electromagnetic gas path control module 10. Using a staggered transmission method, hydrogen is alternately delivered to the second electromagnetic gas path control module 8 or the fourth electromagnetic gas path control module 10. Subsequently, the second electromagnetic gas path control module 8 and the fourth electromagnetic gas path control module 10 transmit hydrogen to the ninth port i or the sixth port f of the ten-way valve 1 according to real-time analysis requirements, providing the required fuel gas for hydrogen flame ionization detection.

[0032] Air transmission path: External air enters the third electromagnetic air path control module 9 through air inlet 3. The integrated control module synchronously sends instructions to the third electromagnetic air path control module 9 to control the first electromagnetic air path control module 7 to selectively connect the air path with the second electromagnetic air path control module 8 or the fourth electromagnetic air path control module 10. Using a staggered transmission method, air is alternately delivered to the second electromagnetic air path control module 8 or the fourth electromagnetic air path control module 10. Subsequently, the second electromagnetic air path control module 8 and the fourth electromagnetic air path control module 10 transmit air to the ninth port i or the sixth port f of the ten-way valve 1 according to real-time analysis requirements, for backflushing and cleaning of the heavy hydrocarbon components remaining inside the ten-way valve 1.

[0033] In a more preferred embodiment of the present invention, a pressure regulating valve 11 and a flow valve 12 are sequentially installed on the air pipeline between the air inlet 3 and the third electromagnetic air circuit control module 9. After passing through the pressure regulating valve 11 and the flow valve 12, the air pipeline branches into two branches. One branch connects to the air inlet of the third electromagnetic air circuit control module 9, and the other branch connects to the air inlet of the main column 13. The air outlet of the main column 13 connects to the ten-way valve 1. The pressure regulating valve 11 can stably regulate the external air pressure entering from the air inlet 3, ensuring consistent pressure for each backflushing and guaranteeing the stability of the cleaning effect. The flow valve 12 can precisely control the air delivery flow rate. One branch of the air pipeline supplies air to the third electromagnetic air circuit control module 9, and the other branch supplies air to the main column 13.

[0034] In a more preferred embodiment of the present invention, the ten-way valve 1 is further provided with a waste gas vent 4, and a component identifier 2 is also installed inside the chromatograph body, and the component identifier 2 is fixedly installed between the third electromagnetic gas path control module 9 and the air inlet of the main column 13. When the chromatograph gas path control device that can realize hydrogen circulation and synchronous cleaning is running, air is delivered to the ninth port i of the ten-way valve 1 through the third electromagnetic gas path control module 9 and the second electromagnetic gas path control module 8, or air is delivered to the sixth port f of the ten-way valve 1 through the third electromagnetic gas path control module 9 and the fourth electromagnetic gas path control module 10 to backflush and clean the heavy hydrocarbon components remaining inside the ten-way valve 1. After cleaning, the waste gas carrying the heavy hydrocarbon components needs to be removed from the gas path in time to avoid stagnation in the gas path and re-contamination of the cleaned channel or mixing into the sample gas in the detection stage. The waste gas vent 4 provides an emission path for the waste gas carrying the heavy hydrocarbon components.

[0035] 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, and the second port b of the ten-way valve 1 is connected to the sample gas vent 5. The sample gas vent 5 is used to safely discharge redundant or unqualified sample gas.

[0036] In a more preferred embodiment of the present invention, a metering tube 15 is connected between the third port c and the tenth port j of the ten-way valve 1, and a pre-cutting column 14 is connected between the fourth port d and the eighth port h of the ten-way valve 1.

[0037] Example 3 This invention also provides a hydrogen closed-loop circulation control method for a chromatograph, which, using the aforementioned hydrogen closed-loop circulation control device for a chromatograph, includes the following steps: The system reads the preset operating parameters through the integrated control module and detects the hydrogen source pressure, air source pressure, the opening and closing status of the solenoid valve in the multi-stage electromagnetic gas circuit control module and the sensor signal of the ten-way valve 1 to confirm that the system meets the safe start-up conditions. Based on the confirmed safe startup status, the integrated control module divides the analysis period into two equal time periods and allocates the timing of the on / off state of the multi-level electromagnetic pneumatic control module, enabling the multi-level electromagnetic pneumatic control module to switch between mode one and mode two.

[0038] When the ten-way valve 1 is in mode one, the integrated control module controls the air circuit connection between the first electromagnetic air circuit control module 7 and the second electromagnetic air circuit control module 8, and the air circuit connection between the third electromagnetic air circuit control module 9 and the fourth electromagnetic air circuit control module 10. Simultaneously, the gas path between the first electromagnetic gas path control module 7 and the fourth electromagnetic gas path control module 10 is closed, as is the gas path between the third electromagnetic gas path control module 9 and the second electromagnetic gas path control module 8.

[0039] When the ten-way valve 1 is in mode two, the integrated control module controls the air passage between the first electromagnetic air passage control module 7 and the fourth electromagnetic air passage control module 10, and the air passage between the third electromagnetic air passage control module 9 and the second electromagnetic air passage control module 8, while simultaneously controlling the air passage between the first electromagnetic air passage control module 7 and the second electromagnetic air passage control module 8 to be closed, and the air passage between the third electromagnetic air passage control module 9 and the fourth electromagnetic air passage control module 10 to be closed.

[0040] In a more specific embodiment of the present invention, after the integrated control module is powered on, it first reads the preset operating parameters, including a hydrogen pressure range of 0.2 MPa, a hydrogen flow rate threshold of 120 ml / min, an air pressure range of 0.3 MPa, an air flow rate threshold of 200 ml / min, and an operating mode switching cycle of 5 to 30 seconds.

[0041] It also detects the hydrogen source pressure, air source pressure, the opening and closing status of the solenoid valve in the multi-stage electromagnetic gas circuit control module, and the sensor signal of the ten-way valve 1 to confirm whether the device meets the safe start-up conditions; after the device meets the safe start-up conditions, the device enters the detection preparation state. Air enters the device through air inlet 3 and flows through pressure regulating valve 11 and flow valve 12 in sequence. The air is then delivered in two branches: one branch enters the third electromagnetic gas path control module 9 to reserve gas source for the backflushing cleaning process; the other branch enters the main column 13 to provide the necessary conditions for the subsequent separation of sample gas in the main column 13.

[0042] Hydrogen enters the first electromagnetic gas path control module 7 through hydrogen inlet 6. Under the instruction of the integrated control module, the first electromagnetic gas path control module 7 is in a standby state, ready to deliver hydrogen to the corresponding module according to the working mode of the ten-way valve 1, so as to reserve fuel gas for hydrogen flame ionization detection.

[0043] Formation gas samples requiring total hydrocarbon content detection are introduced through the total hydrocarbon sample gas inlet 16, while other formation gas samples requiring analysis of specific hydrocarbon components are introduced through the sample inlet 17. Both types of formation gas samples with total hydrocarbon content and other formation gas samples requiring analysis of specific hydrocarbon components enter the interior of the ten-way valve 1 through the first port a.

[0044] Two sample gases are directed to the main column 13, which separates the components of the two sample gases, separating different types of hydrocarbons one by one to obtain the separated sample gas components. The separated sample gas components enter the ten-way valve 1, waiting to enter the detection stage.

[0045] The integrated control module divides the analysis cycle into two equal periods, controlling the ten-way valve 1 to alternately switch between mode one and mode two, so that detection and cleaning can be performed simultaneously: In this embodiment, mode one operation: the integrated control module controls the first electromagnetic gas path control module 7 and the second electromagnetic gas path control module 8 to conduct, and hydrogen gas is delivered to the ninth interface i of the ten-way valve 1 through the first electromagnetic gas path control module 7 and the second electromagnetic gas path control module 8, forming a detection environment with the separated sample gas components in the ten-way valve 1; then the separated sample gas components and hydrogen gas enter the component identifier 2 together; the component identifier 2 uses hydrogen flame ionization technology to detect the ion current intensity, determine the content of hydrocarbon components in the two sample gases, and complete the detection data acquisition. Simultaneously, the integrated control module controls the third electromagnetic gas path control module 9 and the fourth electromagnetic gas path control module 10 to conduct, and air is delivered to the sixth interface f of the ten-way valve 1 through this path. The air backflushs and cleans the heavy hydrocarbon components remaining inside the ten-way valve 1. After cleaning, the exhaust gas carrying the heavy hydrocarbon components must be removed from the gas path in time to avoid lingering in the gas path and re-contaminating the cleaned channel or mixing into the sample gas in the detection process, so as to avoid the residual components interfering with subsequent detection. The exhaust gas carrying the heavy hydrocarbon components is discharged from the exhaust gas vent 4.

[0046] Mode 2 Operation: The integrated control module controls the gas path switching. The first electromagnetic gas path control module 7 and the fourth electromagnetic gas path control module 10 are connected, and hydrogen is delivered to the sixth port f of the ten-way valve 1, where it combines with the separated sample gas components and enters the component identifier 2 to complete a new round of detection data acquisition. At the same time, the third electromagnetic gas path control module 9 and the second electromagnetic gas path control module 8 are connected, and air is delivered to the ninth port i of the ten-way valve 1. The air backflushs and cleans the heavy hydrocarbon components remaining inside the ten-way valve 1. After cleaning, the waste gas carrying the heavy hydrocarbon components must be removed from the gas path in time to avoid lingering in the gas path and re-contaminating the cleaned channel or mixing into the sample gas in the detection stage, so as to avoid the residual components interfering with subsequent detection. The waste gas carrying the heavy hydrocarbon components is discharged from the waste gas vent 4.

[0047] 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 hydrogen closed-loop circulation control device for a chromatograph, characterized in that, The chromatograph includes a main body, and a ten-way valve (1), a multi-stage electromagnetic gas path control module, an integrated control module and a ten-way valve control module are fixedly installed inside the main body. The ten-way valve (1) is fixedly connected to the gas pipeline group and the multi-stage electromagnetic gas circuit control module. The gas pipeline group includes a hydrogen pipeline and an air pipeline. The hydrogen pipeline introduces hydrogen into the multi-stage electromagnetic gas circuit control module, and the air pipeline introduces air into the multi-stage electromagnetic gas circuit control module and the ten-way valve (1). The ten-way valve (1) is also connected to a component identifier (2). The integrated control module is electrically connected to the multi-stage electromagnetic air circuit control module and the control module for the ten-way valve. The integrated control module is used to control the multi-stage electromagnetic air circuit control module to switch the air circuit and to control the ten-way valve control module to adjust the working mode of the ten-way valve (1).

2. The hydrogen closed-loop circulation control device 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 first electromagnetic gas path control module (7) has a hydrogen inlet (6) connected to its inlet end, and the first electromagnetic gas path control module (7) has an outlet end connected to the inlet end of the second electromagnetic gas path control module (8) and the fourth electromagnetic gas path control module (10). The air inlet of the third electromagnetic air circuit control module (9) is connected to the second electromagnetic air circuit control module (8), and the air outlet of the third electromagnetic air circuit control module (9) is connected to the fourth electromagnetic air circuit control module (10); and the air inlet of the third electromagnetic air circuit control module (9) is also connected to an air inlet (3).

3. The hydrogen closed-loop circulation control device for a chromatograph according to claim 2, characterized in that, A pressure regulating valve (11) and a flow valve (12) are sequentially installed on the air pipeline between the air inlet (3) and the third electromagnetic air circuit control module (9). After passing through the pressure regulating valve (11) and the flow valve (12), the air pipeline splits into two branches. One branch is connected to the air inlet of the third electromagnetic air circuit control module (9), and the other branch is connected to the air inlet of the main column (13). The air outlet of the main column (13) is connected to the ten-way valve (1).

4. The hydrogen closed-loop circulation control device for a chromatograph according to claim 3, characterized in that, The outlet of the second electromagnetic gas path control module (8) is connected to the ninth interface (i) of the ten-way valve (1), and the outlet of the fourth electromagnetic gas path control module (10) is connected to the sixth interface (f) of the ten-way valve (1). Under the control of the integrated control module, the first electromagnetic gas path control module (7) supplies hydrogen to the second electromagnetic gas path control module (8) and the fourth electromagnetic gas path control module (10) in a staggered manner, and the third electromagnetic gas path control module (9) supplies air to the second electromagnetic gas path control module (8) and the fourth electromagnetic gas path control module (10) in a staggered manner.

5. The hydrogen closed-loop circulation control device for a chromatograph according to claim 4, characterized in that, The ten-way valve (1) is also provided with a waste gas vent (4), and the chromatograph body is also equipped with a component identifier (2), which is fixedly installed between the third electromagnetic gas path control module (9) and the gas inlet of the main column (13).

6. The hydrogen closed-loop circulation control device for a chromatograph according to claim 5, 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), and the second port (b) of the ten-way valve (1) is connected to the sample gas vent (5).

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

8. A method for closed-loop control of hydrogen gas circulation in a chromatograph, characterized in that, The application of the hydrogen closed-loop circulation control device for a chromatograph according to any one of claims 1-7 includes the following steps: The preset working parameters are read by the integrated control module, and the opening and closing status of the solenoid valve in the multi-stage electromagnetic gas circuit control module and the sensor signal of the ten-way valve (1) are detected to confirm whether the device meets the safe start-up conditions. After the device meets the safe start-up conditions, the integrated control module divides the analysis period into two equal time periods and allocates the on / off state of the gas path of the multi-level electromagnetic gas path control module in a time sequence, so that the multi-level electromagnetic gas path control module switches between mode one and mode two.

9. The method for closed-loop hydrogen circulation control in a chromatograph according to claim 8, characterized in that, When the ten-way valve (1) is in mode one, the integrated control module controls the air circuit connection between the first electromagnetic air circuit control module (7) and the second electromagnetic air circuit control module (8), and the air circuit connection between the third electromagnetic air circuit control module (9) and the fourth electromagnetic air circuit control module (10). Simultaneously, the gas path between the first electromagnetic gas path control module (7) and the fourth electromagnetic gas path control module (10) is closed, and the gas path between the third electromagnetic gas path control module (9) and the second electromagnetic gas path control module (8) is closed.

10. The method for closed-loop hydrogen circulation control in a chromatograph according to claim 9, characterized in that, When the ten-way valve (1) is in mode two, the integrated control module controls the air passage between the first electromagnetic air passage control module (7) and the fourth electromagnetic air passage control module (10) to be open, and the air passage between the third electromagnetic air passage control module (9) and the second electromagnetic air passage control module (8) to be open. At the same time, it controls the air passage between the first electromagnetic air passage control module (7) and the second electromagnetic air passage control module (8) to be closed, and the air passage between the third electromagnetic air passage control module (9) and the fourth electromagnetic air passage control module (10) to be closed.

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