Hydrogen flame chromatograph valve island type gas path constant temperature control device and control method

Abstract

The embodiment of the present application provides a hydrogen flame chromatograph valve island type gas path constant temperature control device and a control method, and belongs to the technical field of hydrogen flame chromatographs. The hydrogen flame chromatograph valve island type gas path constant temperature control device is characterized in that the device comprises: a plurality of gas path units arranged on a device main body; each gas path unit comprises a plurality of gas path outlets / inlets arranged on the surface of the device main body; an electromagnetic unit is used for adjusting the gas path direction of gas in each gas path pipeline; a constant temperature unit is arranged in the device main body and is used for adjusting the temperature of required gas for FID analysis in each gas path pipeline; the electromagnetic unit and the constant temperature unit are both connected to a control unit, and the control unit is used for executing the control of the electromagnetic unit and the constant temperature unit based on the current required parameters of FID analysis. The present application solves the problem that the existing hydrogen flame chromatograph cannot guarantee that the gas supply state meets the best working state of the chromatograph during the test process, thereby improving the detection result accuracy.

Description

Technical Field

[0001] This invention relates to the field of hydrogen flame chromatograph technology, specifically to a valve island gas path constant temperature control device and a method for hydrogen flame chromatograph valve island gas path constant temperature control. Background Technology

[0002] In the field of oil exploration and development, flame chromatographs (FGCs) play a crucial role and are considered one of the most essential pieces of equipment. Their primary function is to perform real-time combustion analysis of the hydrocarbon content in formation gas, providing vital data support for oil exploration and development. During the operation of an FGC, the sample pump plays a key role, continuously delivering the sample gas, degassed from the formation gas by the degasser, into the chromatograph for analysis. In this process, the FID (Flame Ionization Detector) is an indispensable component, requiring air and hydrogen as auxiliary gases to complete the analysis. After entering the chromatograph, the sample gas and auxiliary gas are transported through metal or plastic pipelines, with each gas path controlled and transported by a separate pipeline and control gas path assembly.

[0003] However, despite the crucial role of flame chromatographs (FGCs) in petroleum exploration and development, current gas delivery systems suffer from several shortcomings that limit the equipment's performance and accuracy. First, the temperature of each gas path fluctuates with ambient temperature, sometimes exceeding and sometimes falling below the chromatograph's optimal operating temperature, leading to poor repeatability of FID analysis. Second, the temperature difference between the sample gas and the optimal analysis temperature can cause chemical or physical changes in components, resulting in significant errors between the analytical results and the actual oil and gas content. Furthermore, inconsistencies in pipeline length, the number of connectors, and the location of control components in each gas path affect the stability and uniformity of gas flow. Finally, this structure and control method also complicates troubleshooting, increasing the difficulty and cost of maintenance and repair. To address the issue of insufficient gas supply to ensure optimal chromatograph operating conditions during current FGC testing, resulting in low accuracy, a new gas supply scheme is needed. Summary of the Invention

[0004] The purpose of this invention is to provide a valve island-type gas path constant temperature control device and control method for a hydrogen flame chromatograph, so as to at least solve the problem that the existing hydrogen flame chromatograph cannot guarantee that the gas supply meets the optimal working state of the chromatograph, resulting in low accuracy of the detection results.

[0005] To achieve the above objectives, a first aspect of the present invention provides a valve island-type gas path constant temperature control device for a flame chromatograph. The device includes: a main body and multiple gas path units disposed on the main body; each gas path unit includes multiple gas path inlets / outlets disposed on the surface of the main body, and each gas path inlet / outlet is connected to an electromagnetic unit on the other side of the main body via an independent gas path pipe; the electromagnetic unit is used to adjust the gas path direction in each gas path pipe; a constant temperature unit is disposed within the main body for adjusting the temperature of the gas required for FID analysis in each gas path pipe; both the electromagnetic unit and the constant temperature unit are connected to a control unit, which is used to execute control of the electromagnetic unit and the constant temperature unit based on the current FID analysis requirements.

[0006] Optionally, each gas path unit includes three gas paths, namely one gas path inlet and two gas path outlets; each gas path unit includes one gas path inlet and two gas path outlets disposed on the surface of the main body of the device.

[0007] Optionally, the electromagnetic unit is configured in a one-to-one correspondence with each pneumatic unit; each electromagnetic unit includes three pneumatic interfaces for corresponding connection to the three pneumatic paths of each pneumatic unit.

[0008] Optionally, the electromagnetic unit includes: an electromagnetic valve core for adjusting the gas path direction in each gas pipeline by rotation; and a sealing ring disposed at each gas pipeline interface and conforming to the shape of the gas pipeline interface for preventing gas leakage.

[0009] Optionally, each gas path unit is arranged in parallel; the constant temperature unit is arranged perpendicularly to each gas path pipe of the gas path unit; the constant temperature unit is installed through the mounting hole on the surface of the device body; the constant temperature unit can be disassembled based on the mounting hole; the constant temperature unit has a pin through hole along the axial direction, the pin through hole extends to the surface of the device body, and is used to fix the constant temperature unit based on the pin after installation.

[0010] Optionally, each gas passage unit has its gas passage pipes arranged longitudinally, and from top to bottom, they are gas passage inlet, gas passage outlet A, and gas passage outlet B; there are gaps between each gas passage pipe along the longitudinal direction; the constant temperature unit includes: a temperature sensor A, a heater A, a heater B, and a temperature sensor B arranged longitudinally from top to bottom; the heater A passes through the gap between the gas passage inlet and the gas passage outlet A; the heater B passes through the gap between the gas passage outlet A and the gas passage outlet B.

[0011] Optionally, the length and orifice diameter of each gas pipeline are the same; the control direction of each electromagnetic unit is the same; and the outlet of each gas pipeline is connected to FID analysis.

[0012] A second aspect of the present invention provides a method for isothermal control of a gas path in a flame chromatograph (FGC) valve island. The method is based on the aforementioned isothermal control device for a flame chromatograph valve island gas path. The method includes: acquiring state information of a target gas to be analyzed using FID; generating a corresponding test plan based on the state information of the target gas; executing the test plan; monitoring the gas state information in each gas path pipeline in real time; and correcting the electromagnetic unit control plan and the isothermal unit control plan in real time based on the gas path state information; executing the real-time corrected electromagnetic unit control plan and the isothermal unit control plan; and performing FID analysis until the analysis results are output.

[0013] Optionally, the state information of the target gas to be analyzed by FID includes: the initial temperature information and concentration information of the target gas to be analyzed by FID; the generation of a corresponding test plan based on the state information of the target gas includes: generating an initial control plan for the isothermal unit based on the initial temperature information of the target gas to be analyzed by FID and preset temperature information for performing FID analysis; generating an initial control plan for the electromagnetic unit based on the concentration information of the target gas to be analyzed by FID and preset flow rate information for performing FID analysis; and obtaining a test plan based on the initial control plan of the isothermal unit and the initial control plan of the electromagnetic unit.

[0014] Optionally, the real-time monitoring of gas state information in each gas pipeline and the real-time correction rule for the electromagnetic unit control scheme based on the gas pipeline state information are as follows: real-time monitoring of the flow rate, pressure, and concentration information of the gas required for FID analysis in each gas pipeline; simulation of the electromagnetic unit control scheme based on the flow rate, pressure, and concentration information; comparison of the simulated electromagnetic unit control scheme and the initial control scheme; triggering the correction of the initial control scheme when the deviation between the two is greater than a first deviation threshold; and determining the correction direction and correction amount based on the deviation value between the two.

[0015] Optionally, the correction rule for real-time monitoring of gas state information in each gas pipeline and real-time correction of the constant temperature unit control scheme based on the gas state information is as follows: real-time monitoring of the temperature information of the required gas corresponding to FID analysis in each gas pipeline; wherein, the required gas corresponding to FID analysis includes the target analysis gas, air, and hydrogen; obtaining the target temperature information of each required gas; matching a PID constant temperature algorithm of a corresponding preset level based on the difference between the temperature information of each required gas for FID analysis and the target temperature information of the corresponding required gas; and performing correction on the constant temperature unit control scheme based on the matched PID constant temperature algorithm.

[0016] On the other hand, the present invention provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described method for isotropic control of the gas path of a hydrogen flame chromatograph valve island.

[0017] Through the above technical solution, this invention utilizes valve island centralized control technology and isothermal control technology to develop a valve island-type gas path isothermal control device for a hydrogen flame chromatograph. Installed within the chromatograph, this device precisely controls the pressure, flow rate, and temperature of each gas path, forming a complete valve island-type gas path isothermal control method for hydrogen flame chromatographs. This achieves optimal operating conditions for the chromatograph, improves the repeatability of FID analysis of samples, restores the optimal temperature of the sample gas, ensures that the oil and gas content analyzed by the chromatograph is consistent with the content in the formation gas, and simultaneously improves the efficiency of daily maintenance of the chromatograph, providing technical assurance for oil and gas exploration and evaluation.

[0018] Other features and advantages of the embodiments of the present invention will be described in detail in the following detailed description section. Attached Figure Description

[0019] The accompanying drawings are provided to further illustrate embodiments of the present invention and form part of the specification. They are used together with the following detailed description to explain the embodiments of the present invention, but do not constitute a limitation thereof. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a gas path constant temperature control device for a hydrogen flame chromatograph valve island provided in one embodiment of the present invention.

[0021] Figure 2 This is a schematic diagram of the structure of the gas path constant temperature control device for a hydrogen flame chromatograph valve island after the electromagnetic unit is removed, according to one embodiment of the present invention.

[0022] Figure 3 This is a schematic diagram of the structure of a constant temperature unit provided in one embodiment of the present invention;

[0023] Figure 4 This is an installation diagram illustrating an application scenario of the constant temperature control device for the gas path of a hydrogen flame chromatograph valve island provided in one embodiment of the present invention.

[0024] Figure 5 This is a flowchart of the steps of a method for constant temperature control of a gas path in a valve island of a hydrogen flame chromatograph provided by one embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures

[0026] 1-Main body of the device; 2-Mounting hole for heater A; 3-Mounting hole for heater B; 4-Mounting hole for temperature sensor A; 5-Through hole A for pin; 6-Mounting hole for temperature sensor B; 7-Electromagnetic unit A; 8-Electromagnetic unit B; 9-Electromagnetic unit C; 10-Electromagnetic unit D; 11-Electromagnetic unit E; 12-Air inlet; 13-Air outlet A; 14-Air outlet B; 15-Through hole B for pin; 16-Air outlet B for valve island air group; 17-Air outlet A for valve island air group; 18-Valve island air group Gas inlet; 19-Left side fixing screw hole; 20-Right side fixing screw hole; 21-Valve island gas group D; 22-Valve island gas group C; 23-Valve island gas group B; 24-Valve island gas group A; 25-Gas circuit unit D; 26-Gas circuit unit C; 27-Gas circuit unit B; 28-Gas circuit unit A; 38-Thermostatic unit; 39-Temperature sensor A; 40-Temperature sensor B; 41-Heater A; 42-Heater B; 43-Hydrogen flame chromatograph main unit; 44-Control unit; 45-FID. Detailed Implementation

[0027] The specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit the present invention.

[0028] Figure 1 This is a structural diagram of a gas path constant temperature control device for a hydrogen flame chromatograph valve island provided in one embodiment of the present invention. Figure 1 As shown, this invention provides a valve island-type gas path constant temperature control device for a hydrogen flame chromatograph. The device includes: a main body 1, and multiple gas path units disposed on the main body 1; each gas path unit includes multiple gas path inlets / outlets disposed on the surface of the main body 1, and each gas path inlet / outlet is connected to an electromagnetic unit on the other side of the main body 1 through an independent gas path pipe; the electromagnetic unit is used to adjust the gas path direction in each gas path pipe; a constant temperature unit 38 is disposed inside the main body 1, used to adjust the temperature of the gas required for FID analysis in each gas path pipe; both the electromagnetic unit and the constant temperature unit 38 are connected to a control unit 44, and the control unit 44 is used to execute the control of the electromagnetic unit and the constant temperature unit 38 based on the current FID analysis requirements.

[0029] In this embodiment of the invention, in order to facilitate temperature control of each gas stream introduced into the chromatograph, a corresponding device body 1 is provided, and a corresponding gas pipeline is provided within the device body 1. By performing temperature detection and temperature adjustment of the flowing gas along the gas pipeline, the temperature of the gas is controlled during the flow process to ensure that the temperature is maintained within the optimal operating temperature range of the chromatograph. Then, the gas flow direction and flow control are performed through a corresponding electromagnetic unit to ensure that the gas that meets the test requirements is introduced into the chromatograph under the premise of meeting the gas quantity and temperature conditions, thereby ensuring test accuracy.

[0030] In one possible implementation, to achieve gas temperature control, a main device 1 needs to be designed first. The main device 1 is the core of the entire temperature control system, internally containing components such as gas pipelines, an electromagnetic unit, and a temperature detection and regulation system. The gas pipeline is the channel through which the gas flows, and its design needs to consider the following aspects: the pipeline material should have good thermal conductivity and corrosion resistance to ensure accurate gas temperature control and a long pipeline life. A reasonable pipeline layout can reduce gas flow resistance and improve temperature regulation efficiency. The pipeline interfaces should be designed as standardized interfaces for easy connection to chromatographs and other equipment.

[0031] Furthermore, the temperature detection and regulation system is the core of temperature control. It monitors and adjusts the gas temperature in real time to ensure it remains within the set range. Temperature sensors are installed at key locations in the gas pipeline to monitor the gas temperature in real time. These sensors must possess high accuracy and rapid response characteristics. Based on the temperature data fed back by the sensors, heating is controlled to regulate the temperature. Alternatively, a corresponding cooling device can be installed to rapidly cool the gas when its initial temperature exceeds the target temperature. Commonly used heating devices include electric heaters, while cooling devices can employ thermoelectric coolers or liquid cooling systems.

[0032] Preferably, the control system processes the data from the temperature sensor using an algorithm to dynamically adjust the operating state of the heating or cooling device to maintain a stable gas temperature. To achieve gas flow direction and flow rate control, multiple electromagnetic units are installed within the main body 1. These electromagnetic units can precisely control the gas flow path and velocity. The gas flow direction is controlled by opening and closing the solenoid valves, ensuring that the gas enters the chromatograph along a predetermined path. The flow controller is used to regulate the gas flow rate, ensuring that the gas flow rate entering the chromatograph meets the testing requirements.

[0033] Based on the present invention, the design and implementation of the gas pipeline, temperature detection and regulation system, and electromagnetic unit can significantly improve the testing accuracy and reliability of the chromatograph. The real-time temperature detection and regulation system ensures that the gas temperature is always maintained within the set range, reducing the impact of temperature fluctuations on the test results. The electromagnetic unit achieves precise control of gas flow rate and direction, ensuring that the gas meets the testing requirements when entering the chromatograph. Through dual control of temperature and flow rate, the conditions for gas entering the chromatograph are more stable, significantly improving the accuracy and reproducibility of chromatographic analysis. The main body 1 of the device integrates temperature detection, regulation, and flow control functions, making the system compact and easy to operate.

[0034] Preferably, the device body 1 proposed in this invention is not only applicable to traditional gas chromatographs, but can also be extended to other analytical instruments requiring precise control of gas temperature and flow rate, such as liquid chromatographs and mass spectrometers. With the development of analytical technology and the increasing demands of applications, this technology has broad application prospects and market potential.

[0035] Preferably, each gas path unit includes three gas paths, namely one gas path inlet 12 and two gas path outlets; each gas path unit includes one gas path inlet 12 and two gas path outlets disposed on the surface of the device body 1.

[0036] In this embodiment of the invention, the main body 1 is the core of the entire system, containing multiple gas pipelines, a temperature detection and regulation system, and multiple gas outlets. Each gas outlet can output gas at a constant temperature to accommodate the needs of different gas components. The gas pipelines are the channels through which the gas flows, and their design must consider the thermal conductivity and corrosion resistance of the materials, as well as the rationality of the pipeline layout. Selecting materials with high thermal conductivity, such as stainless steel or copper pipes, can ensure rapid adjustment of gas temperature. A reasonable pipeline layout can reduce gas flow resistance and improve temperature control efficiency. To meet the temperature requirements of different gas components, the main body 1 is designed with multiple gas outlets. Each gas outlet can output gas at different temperatures to accommodate subsequent FID analysis at differentiated temperatures. Each gas outlet corresponds to an independent temperature zone, and through an independent temperature detection and regulation system, precise temperature control of different gas components is achieved. Users can configure the temperature of each gas outlet according to actual needs to ensure that different gas components enter FID analysis at the optimal temperature, thereby improving analytical accuracy.

[0037] Preferably, the electromagnetic unit is configured in a one-to-one correspondence with each air passage unit; each electromagnetic unit includes three air passage interfaces for corresponding connection to the three air passages of each air passage unit.

[0038] Specifically, such as Figure 1 and Figure 2 A device designed as a five-way gas path unit, including, for example Figure 1A device with a five-way gas path unit design is proposed, including gas path unit A28, gas path unit B27, gas path unit C26, gas path unit D25, and gas path unit E, with corresponding electromagnetic units A7, B8, C9, D10, and E11. Each electromagnetic unit is connected to the device body 1 via a left-side fixing screw hole 19 and a right-side fixing screw hole 20. Corresponding valve island gas groups are also provided between the device body 1 and the electromagnetic units, corresponding to electromagnetic units A7, B8, C9, D10, and E11, respectively, with valve island gas groups A24, B23, C22, D21, and E. Each valve island gas group includes a valve island gas group outlet A17, a valve island gas group outlet B16, a valve island gas group inlet 18, a left-side fixing screw hole 19, and a right-side fixing screw hole 20. Each gas path unit includes three gas paths: one gas inlet A12 and two gas outlets; each gas path unit includes one gas inlet A12 and two gas outlets disposed on the surface of the main body 1 of the device, namely gas inlet A12, gas outlet A13 and gas outlet B14.

[0039] In this embodiment of the invention, the required amount of each gas component varies depending on the different testing requirements. In order to ensure that each gas can be supplied according to the required amount, the present invention provides an independent electromagnetic unit for each gas path unit. This electromagnetic unit is used to independently control the gas supply status of the corresponding gas path unit.

[0040] In one possible implementation, to achieve independent control of each gas path unit, the present invention incorporates an independent electromagnetic unit in each gas path unit. The core function of this electromagnetic unit is to independently adjust the gas supply status of the corresponding gas path according to preset control commands, ensuring that the gas supply volume of each path meets specific requirements. The electromagnetic unit mainly consists of a solenoid valve, a control circuit, and a feedback system. The solenoid valve is the actuator of the electromagnetic unit, controlling the gas flow state through on / off electrical signals. High-performance solenoid valves can quickly respond to control commands, achieving precise gas control. The control circuit receives commands from a host computer or control system and drives the solenoid valve. The control circuit can also implement complex logic control, such as timed switching and proportional regulation. The feedback system monitors gas flow and status, feeding the monitoring data back to the control system to achieve closed-loop control. Commonly used feedback elements include flow meters and pressure sensors.

[0041] Preferably, the electromagnetic unit can implement multiple control modes to adapt to different application requirements. Based on a preset gas demand, the electromagnetic unit precisely controls the gas supply, suitable for experiments and processes requiring precise proportions. Based on a preset time period, the electromagnetic unit switches on and off periodically, suitable for periodic gas supply needs. Based on real-time feedback of gas flow or pressure data, the electromagnetic unit dynamically adjusts to achieve real-time control of gas flow.

[0042] Preferably, the electromagnetic unit includes: an electromagnetic valve core for adjusting the gas path direction in each gas pipeline by rotation; and a sealing ring disposed at each gas pipeline interface and conforming to the shape of the gas pipeline interface for preventing gas leakage.

[0043] In one possible implementation, an electromagnetic valve core is fixedly installed inside the electromagnetic unit. The air path is determined by the rotation of the valve core. Each air path orifice of the electromagnetic unit is fixedly equipped with a sealing ring. The sealing ring matches the top opening of the device body to form a sealed space. The electromagnetic unit and the control unit 44 are fixedly connected by a signal line.

[0044] Preferred, such as Figure 2 Each gas path unit is arranged in parallel; the constant temperature unit 38 is arranged perpendicularly to each gas path pipe of the gas path unit; the constant temperature unit 38 is installed through the mounting hole on the surface of the device body 1; the constant temperature unit 38 can be disassembled based on the mounting hole; the constant temperature unit 38 has a pin through hole along the axial direction, the pin through hole extends to the surface of the device body 1, and is used to fix the constant temperature unit 38 based on the pin after installation.

[0045] In this embodiment of the invention, ensuring a constant gas temperature is crucial for improving analytical and control accuracy in a gas analysis and control system. To achieve this goal, the invention proposes a novel structural design that arranges each gas path unit in parallel and introduces a temperature control unit 38 that intersects the gas path pipeline vertically. This design not only optimizes the overall system structure but also improves the effectiveness of gas temperature control and ease of operation. The parallel arrangement of the gas path units means that each unit operates independently and parallel to the others within the main body 1 of the device. The advantages of this parallel arrangement are:

[0046] 1) Independent operation: Each gas circuit unit can be controlled independently, without being affected by other gas circuit units, thereby achieving precise control of gas flow and composition.

[0047] 2) Easy to maintain: The parallel setup makes it easier to maintain and repair each gas circuit unit. When a gas circuit unit needs to be repaired, it will not affect the normal operation of other units.

[0048] 3) Compact structure: The parallel arrangement makes the internal structure of the main body 1 of the device more compact, which helps to save space and simplify the overall design.

[0049] Furthermore, the thermostatic unit 38 is vertically positioned relative to the gas pipes of the gas path unit. This design ensures that the gas is uniformly heated or cooled by the thermostatic unit 38 as it flows through the gas pipes, thus guaranteeing the stability of the gas temperature. The vertical positioning allows the gas to evenly contact the heated or cooled surfaces of the thermostatic unit 38 as it flows, achieving uniform temperature regulation. The vertical positioning effectively reduces the temperature gradient generated during gas flow, ensuring the constancy of the gas temperature. The vertical positioning also helps optimize the airflow path, allowing the gas to flow smoothly through the pipes while being controlled by the thermostatic unit 38.

[0050] Furthermore, the thermostat unit 38 is installed through mounting holes on the surface of the device body 1. The mounting hole design not only facilitates the installation and fixation of the thermostat unit 38 but also considers future disassembly and maintenance needs. Through the mounting holes, the thermostat unit 38 can be easily installed inside the device body 1, ensuring a simple and quick installation process. Based on the mounting hole design, the thermostat unit 38 can be easily disassembled, facilitating future maintenance and replacement, thus improving the maintainability of the equipment. The mounting hole design allows the thermostat unit 38 to be adjusted in different positions to meet the temperature control requirements of different gas path units.

[0051] Furthermore, such as Figure 1 and Figure 2 The thermostat unit 38 has a pin through-hole along its axial direction, extending to the surface of the main body 1, for fixing the thermostat unit 38 after installation. The main function of the pin design is to ensure that the thermostat unit 38 remains stable during operation, guaranteeing its normal function. The pin through-hole design ensures that the thermostat unit 38 is firmly fixed after installation, preventing displacement due to vibration or other factors. Fixing with the pin is simple and quick, requiring no complicated tools or procedures. The pin fixing method is safe and reliable, able to withstand certain external impacts, ensuring stable operation of the thermostat unit 38 under various working conditions.

[0052] Preferably, there are two pin through holes on the main body of the device, including pin through hole A5 and pin through hole B15, which are located on both sides of the main body of the device 1.

[0053] Preferred, such as Figure 2 and Figure 3Each gas path unit has its gas path pipes arranged longitudinally, from top to bottom as gas path inlet, gas path outlet A, and gas path outlet B; there are gaps between each gas path pipe along the longitudinal direction; the constant temperature unit 38 includes: a temperature sensor A39, a heater A41, a heater B42, and a temperature sensor B40 arranged longitudinally from top to bottom; the heater A41 passes through the gap between the gas path inlet and the gas path outlet A; the heater B42 passes through the gap between the gas path outlet A and the gas path outlet B.

[0054] Specifically, the temperature sensor A39, heater A41, heater B42 and temperature sensor B40, which are arranged longitudinally from top to bottom, are respectively provided with mounting holes 4 for temperature sensor A39, 2 for heater A41, 3 for heater B42 and 6 for temperature sensor B40 on the main body of the device.

[0055] In one possible implementation, the temperatures of the full hydrocarbon gas path and the component gas path differ to ensure that the full hydrocarbon and component gases maintain different constant temperatures under constant pressure and constant flow conditions. This is achieved through the length and temperature of the gas path inside the main body 1 of the device. Specifically, the constant temperature of the gas path is achieved through heaters A41 and B42. Heater A41 maintains a constant temperature in the main body 1. The gas path inlet is located at the top of heater A41. Gas path outlet A14 is located between heaters A41 and B42 and connects to the full hydrocarbon FID. Gas path outlet B14 is located below heater B42 and connects to the component FID. Thus, the length of gas path outlet A13 inside the main body 1 and heaters A41 and B42 create a staggered temperature difference, maintaining the optimal gas path temperature required for the full hydrocarbon. Gas path outlet B14 is the longest inside the main body 1, located below heater A41, at the highest temperature in the device. This temperature is the optimal outlet temperature required for the component. The temperature difference and the optimal temperature control of the gas required for the full hydrocarbon components are calculated and compared by the logic control model in control unit 44.

[0056] Preferably, the length and orifice diameter of each gas pipeline are the same; the control direction of each electromagnetic unit is the same; and the outlet of each gas pipeline is connected to FID analysis.

[0057] In this embodiment of the invention, the gas path is stabilized to the optimal gas pressure of the chromatograph. After entering the chromatograph, the gas path is uniformly controlled by the main gas path of the electromagnetic unit. The gas path orifice diameter, gas path length, electromagnetic control force and direction are consistent within the main body 1 of the device. The gas path output end is consistent with the FID. Under the condition of consistent temperature, the pressure from the gas path control end to the FID is the same, thereby improving the analytical accuracy of the chromatograph. The gas path is kept constant to the optimal gas flow rate of the chromatograph, the gas path pressure is kept stable, and the gas path length and gas path orifice diameter are consistent. Under the condition of constant temperature, the gas path flow rate from the control end to the FID is the same, thereby improving the repeatability of the chromatograph in analyzing samples.

[0058] Based on the present invention, firstly, the gas path is stabilized to the optimal pressure of the chromatograph. This step ensures that the gas pressure has reached the optimal state required by the system before entering the chromatograph. The pressure stabilization system is achieved through a high-precision pressure regulating valve and sensor, which can monitor and adjust the gas pressure in real time to maintain a stable gas supply. After entering the chromatograph, the gas path enters the main gas path control system of the electromagnetic unit. The design of the electromagnetic unit allows each gas path to be controlled independently, while ensuring that the operating parameters of all gas paths are consistent. Specifically, the electromagnetic unit can adjust the gas flow rate and pressure, so that the flow characteristics of the gas remain consistent as it passes through various parts of the chromatograph. To further ensure the accuracy of gas control, the gas path orifice diameter and gas path length inside the main body 1 of the device are designed to be consistent. This design can reduce pressure and flow rate changes caused by path differences during gas flow, ensuring that the flow characteristics of the gas are consistent throughout the system. In the gas path system, the connection design between the output end and the FID is also consistent, ensuring that all parameters (including pressure, flow rate, and temperature) are in the optimal state before the gas enters the FID. This design can significantly improve the analytical accuracy of the chromatograph and ensure high consistency of the results of each analysis.

[0059] Preferred, such as Figure 4 In one possible application scenario, the valve island-type gas path constant temperature control device of the flame chromatograph is integrated into the flame chromatograph to achieve equipment integration. The flame chromatograph includes a flame chromatograph main unit 43, a control unit 44, and an FID 45.

[0060] Figure 5 This is a system structure diagram of a hydrogen flame chromatograph valve island gas path constant temperature control method provided by one embodiment of the present invention. Figure 5 As shown, this invention provides a method for isostatic control of the gas path in a valve island of a hydrogen flame chromatograph, the method comprising:

[0061] Step S10: Collect the state information of the target gas to be analyzed by FID, and generate a corresponding test plan based on the state information of the target gas.

[0062] Specifically, based on the initial temperature information of the target gas to be analyzed by FID and the preset temperature information for performing FID analysis, an initial control scheme for the isothermal unit 38 is generated; based on the concentration information of the target gas to be analyzed by FID and the preset flow rate information for performing FID analysis, an initial control scheme for the electromagnetic unit is generated; and a test scheme is obtained based on the initial control scheme of the isothermal unit 38 and the initial control scheme of the electromagnetic unit.

[0063] In one possible implementation, to achieve precise temperature control of the target gas, the system first needs to generate an initial control scheme for the isothermal unit 38 based on the initial temperature information of the target gas and the preset temperature requirements for performing FID analysis. This process includes the following steps:

[0064] 1) Initial Temperature Information Acquisition: The system acquires the initial temperature information of the target gas to be analyzed by FID. This information can be obtained in real time through a temperature sensor to ensure data accuracy.

[0065] 2) Preset Temperature Information Setting: Based on the analysis requirements, set the temperature required for the target gas during FID analysis. The preset temperature information can be set based on experimental experience or standard specifications.

[0066] 3) Temperature difference calculation: The system compares the initial temperature information with the preset temperature information and calculates the temperature difference that needs to be adjusted.

[0067] 4) Control Scheme Generation: Based on the temperature difference, an initial control scheme for the thermostat unit 38 is generated. This scheme includes specific operating steps and parameter settings for heating or cooling to ensure that the target gas reaches the preset temperature before entering the FID.

[0068] Furthermore, gas flow control is equally crucial. The system needs to generate an initial control scheme for the electromagnetic unit based on the target gas concentration information and the preset flow requirements. The specific steps are as follows:

[0069] 1) Concentration Information Acquisition: The system acquires the concentration information of the target gas to be analyzed by FID. The concentration information can be obtained through a gas concentration sensor, ensuring the real-time nature and accuracy of the data.

[0070] 2) Preset Flow Rate Settings: Set the required flow rate of the target gas during the analysis process according to the specific requirements of FID analysis. Preset flow rate information can be set with reference to standard operating procedures or experimental conditions.

[0071] 3) Flow adjustment calculation: The system compares the initial concentration information of the target gas with the preset flow information and calculates the flow parameters that need to be adjusted.

[0072] 4) Control Scheme Generation: Based on the flow adjustment calculation results, an initial control scheme for the electromagnetic unit is generated. This scheme includes specific operating parameters such as the opening and closing times and adjustment range of the solenoid valves to ensure that the gas flow rate meets the requirements of FID analysis.

[0073] In this embodiment of the invention, the solution enables precise control of the FID analysis process, improving the accuracy and repeatability of the analytical results. By precisely controlling the gas temperature and flow rate, the target gas is ensured to be in optimal condition before entering the FID analysis, thus improving analytical precision. The standardized control scheme reduces the impact of human factors on the analytical results, enhancing the repeatability and reliability of sample analysis. Automatically generated control schemes reduce the workload of operators, improving analytical efficiency and laboratory efficiency. Of course, this system is not only applicable to FID analysis but can also be extended to other analytical instruments requiring precise control of gas temperature and flow rate, such as gas chromatography-mass spectrometry (GC-MS) and liquid chromatography-mass spectrometry (LC-MS).

[0074] Step S20: Execute the test plan, monitor the gas status information in each gas pipeline in real time, and correct the electromagnetic unit control plan and the constant temperature unit 38 control plan in real time based on the gas status information.

[0075] Specifically, the real-time monitoring of gas state information in each gas pipeline and the real-time correction rules for the electromagnetic unit control scheme based on the gas pipeline state information are as follows: real-time monitoring of the flow rate, pressure, and concentration information of the gas required for FID analysis in each gas pipeline; simulation of the electromagnetic unit control scheme based on the flow rate, pressure, and concentration information; comparison of the simulated electromagnetic unit control scheme and the initial control scheme; triggering the correction of the initial control scheme when the deviation between the two is greater than a first deviation threshold; and determining the correction direction and correction amount based on the deviation value between the two.

[0076] In one possible implementation, to ensure precise control of the gas state during FID analysis, the system needs to monitor the gas state information in each gas path pipeline in real time. High-precision flow sensors monitor the gas velocity in each pipeline in real time, ensuring that the gas velocity fluctuates within a preset range. Pressure sensors monitor pressure changes in the gas path in real time; maintaining stable pressure is fundamental to ensuring gas flow characteristics. Concentration sensors detect the concentration of specific components in the gas, ensuring the stability and consistency of the gas composition. Based on the real-time monitored flow velocity, pressure, and concentration information, the system needs to simulate the control scheme for the electromagnetic unit. Real-time monitored gas state information is collected, processed, and analyzed. Using the processed data, a control scheme for the electromagnetic unit is generated through a simulation algorithm, predicting the trend of gas state changes. The accuracy of the simulation results is evaluated to ensure that the simulation scheme truly reflects the actual gas state. The process of correcting the initial control scheme requires determining the direction and amount of correction based on the deviation value. The direction of correction is determined by the sign of the deviation value; for example, if the flow velocity is too high, it needs to be reduced, and if it is too low, it needs to be increased. The specific correction amount is calculated based on the magnitude of the deviation value to ensure that the corrected control scheme accurately achieves the preset target. The revised control scheme is input into the system, and the control parameters of the electromagnetic unit are adjusted in real time to ensure the stability of the gas state.

[0077] Furthermore, the real-time monitoring of gas state information in each gas pipeline, and the real-time correction rule for the control scheme of the constant temperature unit 38 based on the gas state information, are as follows: real-time monitoring of the temperature information of the required gas corresponding to FID analysis in each gas pipeline; wherein, the required gas corresponding to FID analysis includes the target analysis gas, air, and hydrogen; obtaining the target temperature information of each required gas; matching a PID constant temperature algorithm of a corresponding preset level based on the difference between the temperature information of each required gas for FID analysis and the target temperature information of the corresponding required gas; and performing correction on the control scheme of the constant temperature unit 38 based on the matched PID constant temperature algorithm.

[0078] In this embodiment of the invention, the system monitors the temperature information in each gas pipeline in real time using high-precision temperature sensors. These sensors are distributed in key locations to ensure accurate acquisition of temperature data for the target analytical gas, air, and hydrogen. The main objective of real-time temperature monitoring is to ensure that the temperature of each required gas remains within a stable range as it flows through the gas pipeline, avoiding the impact of temperature fluctuations on the analysis results. The high-precision temperature sensors provide accurate temperature readings, offering reliable data support for subsequent adjustments to the control scheme. The temperature sensors also possess rapid response characteristics, reflecting temperature changes in real time and ensuring timely adjustments to the control system.

[0079] Furthermore, the gases required for FID analysis, including the target analytical gas, air, and hydrogen, all have specific target temperature requirements. These target temperatures are set according to experimental requirements or standard specifications. The optimal operating temperature of the target analytical gas is set based on the analytical target and sample characteristics. As a combustion-supporting gas, the temperature setting of air must consider its impact on combustion efficiency and detection sensitivity. As a fuel gas, the temperature control of hydrogen directly affects flame stability and ionization efficiency.

[0080] Furthermore, the system compares the real-time monitored temperature information with the preset target temperature information and calculates the difference between the two. The temperature difference is a crucial basis for adjusting the control scheme. The system compares the real-time temperature data with the target temperature one by one to calculate the temperature difference for each required gas. Analyzing the magnitude and trend of the temperature difference provides data support for subsequent control scheme modifications. Based on the temperature information of the required gas analyzed by each FID and the difference between the corresponding target temperature information, the system matches a preset level of PID (Proportional-Integral-Derivative) isothermal algorithm. The PID algorithm is a classic method in temperature control, achieving precise temperature control by adjusting the proportional, integral, and derivative parameters. A suitable PID isothermal algorithm level is selected based on the magnitude and trend of the temperature difference. The proportional, integral, and derivative parameters of the PID algorithm are adjusted according to specific requirements to ensure control accuracy. The selected and adjusted PID algorithm is then applied to the temperature control system.

[0081] Furthermore, based on the matched PID isothermal algorithm, the control scheme of the isothermal unit 38 is modified. The modification process is as follows: A modified isothermal control scheme is generated according to the matched PID algorithm, specifically including the heating or cooling operation steps and parameter settings. The modified control scheme is input into the isothermal unit 38, and the working state of the heating or cooling device is adjusted in real time to ensure that the temperature of each required gas reaches the target requirement. The implementation effect of the modified scheme is monitored to ensure that the temperature control achieves the expected goal, and the control parameters are further adjusted and optimized.

[0082] Based on the present invention, precise control of gas temperature during FID analysis is achieved, with the following specific technical effects: Improved analytical accuracy: Real-time monitoring and precise temperature control ensure that the gas is at the optimal temperature when entering FID analysis, thus improving analytical accuracy. By matching a suitable PID isothermal algorithm, the system can adapt to various experimental conditions, maintain temperature stability, and enhance system stability. Automated temperature monitoring and control reduce manual intervention, improving the efficiency and reliability of experimental operations.

[0083] Step S30: Execute the real-time corrected electromagnetic unit control scheme and the constant temperature unit 38 control scheme, and perform FID analysis until the analysis results are output.

[0084] The present invention also provides a computer-readable storage medium storing instructions that, when executed on a computer, cause the computer to perform the above-described method for isostatic control of the gas path of a hydrogen flame chromatograph valve island.

[0085] Those skilled in the art will understand that all or part of the steps in the methods of the above embodiments can be implemented by a program instructing related hardware. This program is stored in a storage medium and includes several instructions to cause a microcontroller, chip, or processor to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as a USB flash drive, a portable hard drive, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, or an optical disk.

[0086] The optional embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details described above. Within the scope of the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical solutions of the embodiments of the present invention, and these simple modifications all fall within the protection scope of the embodiments of the present invention. It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe the various possible combinations.

[0087] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the embodiments of the present invention, they should also be regarded as the content disclosed by the embodiments of the present invention.

Claims

1. A valve island-type gas path constant temperature control device for a hydrogen flame chromatograph, characterized in that, The device includes: The device body, and multiple air passage units disposed on the device body; wherein, Each gas path unit includes three gas paths: one gas path inlet and two gas path outlets; each gas path unit includes one gas path inlet and two gas path outlets disposed on the surface of the main body of the device. Each gas inlet / outlet is connected to the electromagnetic unit on the other side of the main body of the device through an independent gas pipeline; The electromagnetic unit is used to adjust the gas path direction in each gas pipeline. The main body of the device is equipped with a constant temperature unit, which is used to adjust the temperature of the gas required for FID analysis in each gas pipeline. Each gas pipeline in each gas pipeline unit is arranged longitudinally, and from top to bottom are gas inlet, gas outlet A and gas outlet B; there are gaps between each gas pipeline along the longitudinal direction. The constant temperature unit includes: a temperature sensor A, a heater A, a heater B, and a temperature sensor B arranged longitudinally from top to bottom; the heater A passes through the gap between the gas inlet and the gas outlet A; the heater B passes through the gap between the gas outlet A and the gas outlet B. Both the electromagnetic unit and the constant temperature unit are connected to the control unit, which is used to control the electromagnetic unit and the constant temperature unit based on the demand parameters analyzed by the current FID. The constant temperature control device monitors the flow rate, pressure, and concentration of the gas required for FID analysis in each gas pipeline in real time, and simulates an electromagnetic unit control scheme based on the flow rate, pressure, and concentration information.

2. The apparatus according to claim 1, characterized in that, The electromagnetic unit is configured in a one-to-one correspondence with each pneumatic circuit unit; Each electromagnetic unit includes three air path interfaces, which are used to connect to the three air paths of each air path unit.

3. The apparatus according to claim 2, characterized in that, The electromagnetic unit includes: The solenoid valve core is used to adjust the gas flow direction in each gas pipeline by rotating it. Sealing rings, which are installed at each gas passage interface and conform to the shape of the gas passage interface, are used to prevent gas leakage.

4. The apparatus according to claim 1, characterized in that, Each gas path unit is set up in parallel; The constant temperature unit and the gas pipelines of the gas circuit unit are arranged perpendicularly. The constant temperature unit is installed through the mounting holes on the surface of the device body; The temperature control unit can be disassembled based on the mounting hole; The thermostatic unit has a pin through hole along the axial direction, which extends to the surface of the main body of the device and is used to fix the thermostatic unit based on the pin after installation.

5. The apparatus according to claim 1, characterized in that, All gas passages have the same length and orifice diameter; The control force of each electromagnetic unit follows the same direction; FID analysis of the outlet access of each gas pipeline.

6. A method for isostatic control of the gas path in a valve island of a hydrogen flame chromatograph, characterized in that, The method is implemented based on the gas path constant temperature control device for the hydrogen flame chromatograph valve island as described in any one of claims 1-5, and the method includes: Collect the state information of the target gas to be analyzed by FID, and generate a corresponding test plan based on the state information of the target gas. The test plan is executed to monitor the gas state information in each gas pipeline in real time, and to correct the electromagnetic unit control plan and the constant temperature unit control plan in real time based on the gas state information in the gas pipeline. The electromagnetic unit control scheme and the constant temperature unit control scheme are implemented with real-time correction, and FID analysis is performed until the analysis results are output.

7. The method according to claim 6, characterized in that, The state information of the target gas to be analyzed by FID includes: Initial temperature and concentration information of the target gas to be analyzed by FID; The generation of the corresponding test plan based on the state information of the target gas includes: Based on the initial temperature information of the target gas to be analyzed by FID and the preset temperature information for performing FID analysis, an initial control scheme for the isothermal unit is generated. Based on the concentration information of the target gas to be analyzed by FID and the preset flow information for performing FID analysis, an initial control scheme for the electromagnetic unit is generated. The test scheme is obtained based on the initial control scheme of the constant temperature unit and the initial control scheme of the electromagnetic unit.

8. The method according to claim 7, characterized in that, The correction rules for the electromagnetic unit control scheme are as follows: Real-time monitoring of gas state information in each gas pipeline, and real-time adjustment of the electromagnetic unit control scheme based on the gas state information in the gas pipeline. The constant temperature control device monitors the flow rate, pressure and concentration of the gas required for FID analysis in each gas pipeline in real time, and simulates the electromagnetic unit control scheme based on the flow rate, pressure and concentration information. By comparing the simulated electromagnetic unit control scheme with the initial control scheme, when the deviation between the two exceeds a first deviation threshold, the initial control scheme is triggered to be corrected, and the correction direction and correction amount are determined based on the deviation value between the two.

9. The method according to claim 7, characterized in that, The correction rules for the temperature control unit are as follows: Real-time monitoring of gas state information in each gas pipeline, and real-time adjustment of the control scheme based on this gas state information. Real-time monitoring of the temperature information of the required gas for FID analysis in each gas pipeline; among which... The required gases for the corresponding FID analysis include the target analytical gas, air, and hydrogen; Obtain the target temperature information for each required gas; Based on the difference between the temperature information of the required gas and the target temperature information of the corresponding required gas analyzed by each FID, a PID isothermal algorithm of the corresponding preset level is matched. The control scheme of the temperature control unit is modified based on the matched PID temperature control algorithm.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores instructions that, when executed on a computer, cause the computer to perform the isothermal control method for the gas path of the valve island in a hydrogen flame chromatograph as described in any one of claims 6-9.

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