Method, system and device for controlling gas flow in gas chromatographic column

Abstract

The invention discloses a control method, system and device for gas flow in a gas chromatographic column. The system comprises the gas chromatographic column, a first gas path, a second gas path, a third gas path, a data acquisition unit and a controller, an outlet of the first gas path is respectively connected with an inlet of the second gas path and an inlet of the third gas path through pipelines, an air pressure proportional valve is arranged on the third gas path, and an outlet end of the second gas path is connected with the gas chromatographic column; the data acquisition unit comprises a pressure sensor arranged on the second gas path; and the controller is used for controlling the pressure proportional valve to execute the opening and closing proportion adjustment operation according to the airflow pressure data collected by the pressure sensor until the airflow in the gas chromatographic column reaches the second preset airflow when the airflow of the first preset airflow is conveyed to the second gas path and the third gas path by the first gas path. Therefore, according to the embodiment of the invention, when the temperature of the gas chromatographic column is changed, the gas flow pressure of the gas chromatographic column is controlled, so that the gas flow in the gas chromatographic column realizes a constant flow function.

Description

Technical Field

[0001] The present invention belongs to the technical field of production line safety detection, and in particular to a method, system and device for controlling the gas flow in a gas chromatography column. Background Art

[0002] The gas chromatography column is one of the core components of the gas chromatograph, which is divided into a packed gas chromatography column and a capillary gas chromatography column, referred to as a capillary column. The length of the capillary column ranges from 10 to 200 meters, the inner diameter ranges from 0.22 mm to 0.53 mm, and the flow rate of the capillary column ranges from 0.5 to 10 ml / min, depending on the analysis object. The accurate measurement and control of the flow rate of the gas chromatograph capillary column has an important impact on the analysis of the gas chromatograph.

[0003] However, since the capillary column is in the chromatographic column box of the instrument, its inlet is connected to the instrument vaporization chamber and its outlet is connected to the detection chamber. The temperature of the vaporization chamber, detector and chromatographic column box can be controlled at a maximum of 450 degrees Celsius. During the chromatographic program heating process, as the temperature of the chromatographic column box increases, the viscosity coefficient of the carrier gas in the capillary column increases, the damping of the carrier gas flowing in the capillary column increases, and the gas flow velocity in the capillary column decreases; thus, the retention time of the component obtained by the gas chromatograph will be deviated, thereby affecting the detection accuracy of the gas chromatograph for the gas component.

[0004] Therefore, the present invention urgently needs to provide a method for controlling the gas flow rate in a gas chromatography column, so as to control the gas flow rate in the gas chromatography column to maintain constant. Summary of the invention

[0005] In view of the above problems existing in the prior art, an embodiment of the present invention provides a method, system and device for controlling the gas flow in a gas chromatography column; the method can accurately adjust the gas flow pressure in the gas chromatography column based on the gas flow temperature of the gas chromatography column, so that the gas flow in the gas chromatography column remains constant.

[0006] According to a first aspect of an embodiment of the present invention, a control system for gas flow in a gas chromatography column is provided, comprising: a gas chromatography column; a gas circuit control unit, comprising a first gas circuit, a second gas circuit, and a third gas circuit; the outlet of the first gas circuit is respectively connected to the inlet of the second gas circuit and the inlet of the third gas circuit through pipelines; a pressure proportional valve is arranged on the third gas circuit; the outlet end of the second gas circuit is connected to the gas chromatography column; a data acquisition unit, comprising a pressure sensor arranged on the second gas circuit; a controller, the controller is respectively communicated with the pressure proportional valve and the pressure sensor; the controller is used for controlling the pressure proportional valve to perform an opening and closing ratio adjustment operation according to the gas pressure data collected by the pressure sensor when the first gas circuit conveys the gas flow of a first preset gas flow rate to the second gas circuit and the third gas circuit until the gas flow in the gas chromatography column reaches a second preset gas flow rate.

[0007] Optionally, a flow proportional valve and a flow sensor are provided on the first air path; the controller is also used to control the flow proportional valve to perform an opening and closing ratio adjustment operation according to the airflow flow data collected by the flow sensor until the airflow flow data collected by the flow sensor reaches a first preset air flow.

[0008] Optionally, a chromatographic column temperature control card board is used to collect the airflow temperature of the gas chromatography column; the controller is used to determine the theoretical airflow pressure of the gas chromatography column based on the current airflow temperature, gas chromatography column parameters, and a second preset airflow volume collected by the chromatographic column temperature control card board; and when the airflow in the first air path is delivered to the second air path and the third air path, the pressure proportional valve is controlled to perform an opening and closing ratio adjustment operation until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

[0009] Optionally, an outlet end of the third gas path is connected to an exhaust port; the exhaust port is used to discharge excess air flow in the second gas path.

[0010] Optionally, the gas chromatography column is a capillary column.

[0011] According to a second aspect of an embodiment of the present invention, a method for controlling the gas flow in a gas chromatography column is also provided, which is applied to a control system; the method comprises: obtaining a current gas flow temperature, a current gas flow pressure, and a second preset gas flow of the gas chromatography column; determining a theoretical gas flow pressure of the gas chromatography column based on the current gas flow temperature, gas chromatography column parameters, and the second preset gas flow; and controlling a pressure proportional valve to perform an opening and closing ratio adjustment operation according to the current gas flow pressure and the theoretical gas flow pressure until the gas flow pressure collected by the pressure sensor reaches the theoretical gas flow pressure.

[0012] Optionally, the theoretical airflow pressure of the gas chromatography column is determined based on the current airflow temperature, gas chromatography column parameters, and the second preset airflow volume; including: determining a current gas viscosity coefficient corresponding to the current airflow temperature based on the current airflow temperature and the gas viscosity under standard atmospheric pressure; determining the theoretical airflow pressure of the gas chromatography column based on the second preset airflow volume, gas chromatography column parameters, the current gas viscosity coefficient, and the current airflow temperature.

[0013] Optionally, according to the current airflow pressure and the theoretical airflow pressure, the pressure proportional valve is controlled to perform an opening and closing ratio adjustment operation until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure; including: judging whether the current airflow pressure is greater than the theoretical airflow pressure; if the judgment result indicates that the current airflow pressure is greater than the theoretical airflow pressure, the opening and closing ratio of the pressure proportional valve is increased so that the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure; if the judgment result indicates that the current airflow pressure is less than the theoretical airflow pressure, the opening and closing ratio of the pressure proportional valve is decreased so that the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

[0014] Optionally, the current airflow temperature and the current airflow pressure of the gas chromatography column are obtained; including: determining the current airflow temperature of the gas chromatography column based on temperature data collected by a temperature control card of the gas chromatography column; and determining the current airflow pressure of the gas chromatography column based on pressure data collected by a pressure sensor.

[0015] According to the third aspect of an embodiment of the present invention, a control device for the gas flow in a gas chromatography column is also provided, and the device includes: an acquisition module, used to acquire the current gas flow temperature, current gas flow pressure, and preset gas flow of the gas chromatography column; a determination module, used to determine the theoretical gas flow pressure of the gas chromatography column based on the current gas flow temperature, gas chromatography column parameters, and preset gas flow of the gas chromatography column; and an adjustment module, used to control the pressure proportional valve to perform an opening and closing ratio adjustment operation according to the current gas flow pressure and the theoretical gas flow pressure until the gas flow pressure collected by the pressure sensor reaches the theoretical gas flow pressure.

[0016] According to a fourth aspect of an embodiment of the present invention, there is also provided a computer-readable medium on which a computer program is stored. When the program is executed by a processor, the method described in the second aspect is implemented.

[0017] The present invention provides a method, system and device for controlling the gas flow rate in a gas chromatography column, which system includes: a gas chromatography column, a gas circuit control unit, a data acquisition unit, and a controller; the gas circuit control unit includes a first gas circuit, a second gas circuit, and a third gas circuit; the outlet of the first gas circuit is connected to the inlet of the second gas circuit and the inlet of the third gas circuit through a pipeline respectively; a pressure proportional valve is arranged on the third gas circuit; the outlet end of the second gas circuit is connected to the gas chromatography column; the data acquisition unit includes a pressure sensor arranged on the second gas circuit; the controller is respectively connected to the pressure proportional valve and the pressure sensor in communication; the controller is used to control the pressure proportional valve to perform an opening and closing ratio adjustment operation according to the gas pressure data collected by the pressure sensor when the first gas circuit delivers the gas flow of the first preset gas flow rate to the second gas circuit and the third gas circuit until the gas flow in the gas chromatography column reaches the second preset gas flow rate. Therefore, in this embodiment, when the temperature of the gas chromatography column changes, the gas flow pressure of the gas chromatography column is controlled, so that the gas flow rate in the gas chromatography column can achieve a constant flow function. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0019] Figure 1 A schematic diagram of the structure of a control system for gas flow in a gas chromatography column provided by one embodiment of the present invention;

[0020] Figure 2 A schematic flow chart of a method for controlling the gas flow rate in a gas chromatography column provided in one embodiment of the present invention;

[0021] Figure 3 A schematic structural diagram of a device for controlling the gas flow rate in a gas chromatography column provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0022] In order to make the purpose, features and advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0023] A control system for gas flow in a gas chromatography column, comprising:

[0024] Gas chromatography columns;

[0025] A gas circuit control unit, comprising a first gas circuit, a second gas circuit, and a third gas circuit; the outlet of the first gas circuit is respectively connected to the inlet of the second gas circuit and the inlet of the third gas circuit through pipelines; a gas pressure proportional valve is arranged on the third gas circuit; the outlet end of the second gas circuit is connected to the gas chromatograph column;

[0026] A data acquisition unit, comprising a pressure sensor arranged on the second gas path;

[0027] A controller, wherein the controller is communicatively connected with the pressure proportional valve and the pressure sensor respectively; the controller is used to control the pressure proportional valve to perform an opening and closing ratio adjustment operation according to the airflow pressure data collected by the pressure sensor when the first air path conveys the airflow of the first preset air flow rate to the second air path and the third air path until the airflow in the gas chromatography column reaches the second preset air flow rate.

[0028] First, an airflow of a first preset air flow rate is delivered to a second air path and a third air path through a first air path; when the airflow passes through the second air path, a pressure sensor detects a current airflow pressure of the airflow and sends the current airflow pressure to a controller; then, the controller determines a theoretical airflow pressure of the gas chromatography column according to the current airflow temperature of the gas chromatography column, the parameters of the gas chromatography column, and a second preset airflow rate; thereafter, the controller determines whether the current airflow pressure is greater than the theoretical airflow pressure; if the judgment result indicates that the current airflow pressure is greater than the theoretical airflow pressure, the opening and closing ratio of the pressure proportional valve is increased until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure; if the judgment result indicates that the current airflow pressure is less than the theoretical airflow pressure, the opening and closing ratio of the pressure proportional valve is decreased until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

[0029] It should be noted that the gas chromatography column in this embodiment can be a capillary column or a packed chromatography column; there is no particular limitation here.

[0030] When the temperature of the gas flow in the gas chromatographic column changes, the control system of this embodiment can quickly adjust the gas flow pressure of the gas flow input in the second gas path through the gas pressure proportional valve, and the adjustment operation of the gas pressure proportional valve is not completed until the current gas flow pressure detected by the pressure sensor is equal to the theoretical gas flow pressure corresponding to the current gas flow temperature. In this way, the gas flow rate of the gas flow in the gas chromatographic column can be kept constant, thereby improving the stability and accuracy of the gas flow in the gas chromatographic column.

[0031] In a preferred implementation of this embodiment, in order to accurately control the airflow rate of the airflow input into the first air path, a flow proportional valve and a flow sensor are provided on the first air path; the flow sensor is provided at the inlet end of the first air path, and the flow proportional valve is provided at the outlet end of the first air path; the flow proportional valve is used to adjust the airflow rate of the airflow in the first air path; the flow sensor is used to detect the airflow rate of the airflow in the first air path. The controller is also used to control the flow proportional valve to perform an opening and closing ratio adjustment operation according to the airflow rate data collected by the flow sensor until the airflow rate data collected by the flow sensor reaches a first preset airflow rate.

[0032] In a preferred implementation manner of the present embodiment, the control system further includes: a chromatographic column temperature control card board for detecting the gas chromatography column; the controller is used to determine the theoretical airflow pressure of the gas chromatography column based on the current airflow temperature, gas chromatography column parameters, and a second preset airflow volume detected by the chromatographic column temperature control card board; and when the airflow in the first air path is delivered to the second air path and the third air path, the pressure proportional valve is controlled to perform an opening and closing ratio adjustment operation until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

[0033] Specifically, in the process of using the gas chromatograph, as the program temperature rises, the gas flow temperature in the gas chromatographic column will also rise. Under the conditions of the current gas flow temperature and gas chromatographic column specifications, the constant flow function of the gas chromatographic column is achieved by controlling the gas flow pressure of the gas chromatographic column in real time, thereby achieving the effect of maintaining the constant flow rate of the gas flow in the gas chromatographic column by adjusting the gas flow pressure.

[0034] In a preferred implementation manner of this embodiment, the outlet end of the third gas path is connected to an exhaust port; the exhaust port is used to discharge excess air flow in the second gas path.

[0035] Specifically, the sum of the airflow rate discharged from the exhaust port and the second preset airflow rate is equal to the first preset airflow rate.

[0036] In a preferred implementation manner of this embodiment, the gas chromatography column is a capillary column.

[0037] like Figure 1 FIG. 1 is a schematic diagram of a control system for gas flow in a gas chromatography column provided by an embodiment of the present invention.

[0038] A flow proportional valve and a flow sensor are provided on the first gas circuit, the outlet of the first gas circuit is connected to the first port of the four-way interface; the inlet of the second gas circuit is connected to the second port of the four-way interface, the inlet of the third gas circuit is connected to the third port of the four-way interface, and the pressure sensor is connected to the fourth port of the four-way interface; thus, the outlet of the first gas circuit is connected to the inlet of the second gas circuit and the inlet of the third gas circuit respectively through a four-way interface, and the airflow pressure of the input airflow in the second gas circuit can be effectively monitored by the pressure sensor connected to the four-way interface. More specifically, a pressure proportional valve is provided on the third gas circuit; the input end of the pressure proportional valve is connected to the third port of the four-way interface through a pipeline, and the output end of the pressure proportional valve is connected to the exhaust port through a pipeline. The outlet end of the second gas circuit is connected to the capillary column, and the capillary column is provided with a chromatographic column temperature control card plate for monitoring the current airflow temperature of the capillary column.

[0039] The controller is respectively connected to the flow proportional valve, the flow sensor, the pressure proportional valve, the pressure sensor, and the chromatographic column temperature control card board. When the airflow is input through the first gas path, the controller adjusts the opening and closing ratio of the flow proportional valve based on the airflow flow collected by the flow sensor until the airflow flow collected by the flow sensor reaches the first preset airflow before the adjustment operation is ended. When the airflow of the first preset airflow flow is respectively input to the second gas path and the third gas path through the four-way interface, the controller determines the current theoretical airflow pressure of the capillary column according to the current airflow temperature, the capillary column parameters, and the second preset airflow in the capillary column collected by the chromatographic column temperature control card board. The controller adjusts the opening and closing ratio of the pressure proportional valve on the third gas path based on the airflow pressure collected by the pressure sensor until the airflow pressure collected by the pressure sensor reaches the current theoretical airflow pressure before the adjustment operation is ended. In the chromatograph program heating process, as the temperature of the capillary column increases, it is necessary to adjust the capillary column airflow pressure by continuously adjusting the opening and closing ratio of the pressure proportional valve, so that the airflow flow in the capillary column remains constant.

[0040] like Figure 2 As shown, it is a flow chart of a method for controlling the gas flow in a gas chromatography column provided by one embodiment of the present invention.

[0041] A method for controlling the gas flow rate in a gas chromatographic column, applied to a control system, at least comprising the following steps:

[0042] S201, obtaining a current gas flow temperature, a current gas flow pressure, and a second preset gas flow rate of a gas chromatography column;

[0043] S202, determining a theoretical gas flow pressure of the gas chromatographic column based on the current gas flow temperature, gas chromatographic column parameters, and a second preset gas flow rate;

[0044] S203, according to the current airflow pressure and the theoretical airflow pressure, controlling the pressure proportional valve to perform an opening and closing ratio adjustment operation until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

[0045] In S201, the current gas flow temperature of the gas chromatographic column is determined according to the temperature data collected by the chromatographic column temperature control card board; the current gas flow pressure of the gas chromatographic column is determined according to the pressure data collected by the pressure sensor. A second preset gas flow rate of the gas chromatographic column is obtained based on human-computer interaction.

[0046] In S202, based on the current air flow temperature and the gas viscosity under standard atmospheric pressure, the current gas viscosity coefficient corresponding to the current air flow temperature is determined; based on the second preset air flow rate, gas chromatography column parameters, the current gas viscosity coefficient, and the current air flow temperature, the theoretical air flow pressure of the gas chromatography column is determined.

[0047] Gas chromatography column parameters include: gas chromatography column inner diameter, gas chromatography column length, gas chromatography column outlet pressure, etc.

[0048] For example, the calculation formula of the current gas viscosity coefficient n is shown in formula (1):

[0049] n=n 0 ×(273.15+S) / (T+S)×(T / 273.15)(3 / 2);

[0050] Formula (1);

[0051] Among them, n 0 It represents the gas viscosity at 0 degrees Celsius and 1 standard atmosphere; S is the Arthurian constant; T represents the current gas flow temperature, that is, the column box temperature.

[0052] Theoretical air flow pressure P 1 According to formula (2), we can get:

[0053] F=(10×π×r 2 ) / (4×n×L)×(P 1 2 -P 0 2 ) / P 0 ×(P 0 / P 2 )×(T 1 / T);

[0054] Formula (2);

[0055] Wherein, F-second preset gas flow rate (ml / min);

[0056] r-gas chromatography column inner diameter (cm);

[0057] n-current gas viscosity coefficient (pa·s);

[0058] L-gas chromatography column length (cm);

[0059] T 1 - Standard temperature (298.15K);

[0060] P 2 -Standard pressure (1atm = 101325Pa);

[0061] T - current air flow temperature (K);

[0062] P 1 - Theoretical airflow pressure;

[0063] P 0 -The outlet pressure of the gas chromatography column, the outlet pressure is one atmosphere, P 0 =101325Pa.

[0064] When the gas chromatographic column is a capillary column, the gas flow rate of the capillary column actually adopts the method for controlling the gas flow rate in the gas chromatographic column of this embodiment.

[0065] This embodiment combines the technology of converting pressure into flow rate with the Atherland viscosity coefficient formula, and can achieve real-time control of the column flow rate during the temperature increase of the gas chromatography column.

[0066] Figure 3 A schematic structural diagram of a device for controlling the gas flow rate in a gas chromatography column provided by one embodiment of the present invention.

[0067] A device for controlling the amount of gas in a gas chromatography column, the device 300 comprising: an acquisition module 301, for acquiring the current gas flow temperature, the current gas flow pressure, and the preset gas flow of the gas chromatography column; a determination module 302, for determining the theoretical gas flow pressure of the gas chromatography column based on the current gas flow temperature, gas chromatography column parameters, and the preset gas flow of the gas chromatography column; and an adjustment module 303, for controlling a pressure proportional valve to perform an opening and closing ratio adjustment operation according to the current gas flow pressure and the theoretical gas flow pressure until the gas flow pressure collected by the pressure sensor reaches the theoretical gas flow pressure.

[0068] In a preferred implementation manner of this embodiment, the determination module includes: a first determination unit, used to determine the current gas viscosity coefficient corresponding to the current airflow temperature based on the current airflow temperature and the gas viscosity under standard atmospheric pressure; a second determination unit, used to determine the theoretical airflow pressure of the gas chromatography column based on a second preset air flow rate, gas chromatography column parameters, the current gas viscosity coefficient, and the current airflow temperature.

[0069] In a preferred implementation manner of this embodiment, the adjustment module includes: a judgment unit, used to judge whether the current airflow pressure is greater than the theoretical airflow pressure; a first execution unit, used to increase the opening and closing ratio of the pressure proportional valve if the judgment result indicates that the current airflow pressure is greater than the theoretical airflow pressure so that the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure; and a second execution unit, used to decrease the opening and closing ratio of the pressure proportional valve if the judgment result indicates that the current airflow pressure is less than the theoretical airflow pressure so that the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

[0070] In a preferred implementation manner of this embodiment, the acquisition module includes: a first determination unit, used to determine the current airflow temperature of the gas chromatography column based on the temperature data collected by the chromatographic column temperature control card plate; a second determination unit, used to determine the current airflow pressure of the gas chromatography column based on the pressure data collected by the pressure sensor.

[0071] The above device can execute a method for controlling the gas flow rate in a gas chromatography column provided in an embodiment of the present invention, and has functional modules and beneficial effects corresponding to the method for controlling the gas flow rate in a gas chromatography column. For technical details not described in detail in this embodiment, please refer to the method for controlling the gas flow rate in a gas chromatography column provided in an embodiment of the present invention.

[0072] The present invention also provides an electronic device, comprising: a processor; a memory for storing executable instructions of the processor; the processor is used to read the executable instructions from the memory and execute the instructions to implement the method for controlling the gas flow in a gas chromatography column described in the present invention.

[0073] In addition to the above-mentioned methods and devices, an embodiment of the present application may also be a computer program product, which includes computer program instructions, which, when executed by a processor, enable the processor to execute the steps of the method according to various embodiments of the present application described in the above-mentioned "Exemplary Method" section of this specification.

[0074] The computer program product may be written in any combination of one or more programming languages ​​to write program codes for performing the operations of the embodiments of the present application, including object-oriented programming languages, such as Java, C++, etc., and conventional procedural programming languages, such as "C" language or similar programming languages. The program code may be executed entirely on the user computing device, partially on the user device, as an independent software package, partially on the user computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0075] In addition, an embodiment of the present application may also be a computer-readable storage medium on which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor executes the steps of the method according to the following embodiments of the present application described in the above "Exemplary Method" section of this specification.

[0076] The computer readable storage medium can adopt any combination of one or more readable media. The readable medium can be a readable signal medium or a readable storage medium. The readable storage medium can include, for example, but is not limited to, a system, device or device of electricity, magnetism, light, electromagnetic, infrared, or semiconductor, or any combination of the above. More specific examples (non-exhaustive list) of readable storage media include: an electrical connection with one or more wires, a portable disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the above.

[0077] The basic principles of the present application are described above in conjunction with specific embodiments. However, it should be noted that the advantages, strengths, effects, etc. mentioned in the present application are only examples and not limitations, and it cannot be considered that these advantages, strengths, effects, etc. are required by each embodiment of the present application. In addition, the specific details disclosed above are only for the purpose of illustration and ease of understanding, not for limitation, and the above details do not limit the present application to being implemented by adopting the above specific details.

[0078] The block diagrams of the devices, apparatuses, equipment, and systems involved in this application are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagram. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The words "such as" used here refer to the phrase "such as but not limited to", and can be used interchangeably with them.

[0079] It should also be noted that in the apparatus, device and method of the present application, each component or each step can be decomposed and / or recombined. Such decomposition and / or recombination should be regarded as equivalent solutions of the present application.

[0080] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present application. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present application. Therefore, the present application is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0081] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

[0082] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0083] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0084] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A control system for gas flow in a gas chromatography column, characterized in that: include: Gas chromatography columns; A gas circuit control unit, comprising a first gas circuit, a second gas circuit, and a third gas circuit; the outlet of the first gas circuit is respectively connected to the inlet of the second gas circuit and the inlet of the third gas circuit through pipelines; a gas pressure proportional valve is arranged on the third gas circuit; the outlet end of the second gas circuit is connected to the gas chromatograph column; A data acquisition unit, comprising a pressure sensor disposed on the second gas path; A controller, wherein the controller is communicatively connected with the pressure proportional valve and the pressure sensor respectively; the controller is used to control the pressure proportional valve to perform an opening and closing ratio adjustment operation according to the airflow pressure data collected by the pressure sensor when the first air path conveys the airflow of the first preset air flow rate to the second air path and the third air path until the airflow in the gas chromatography column reaches the second preset air flow rate.

2. The control system according to claim 1, characterized in that: The first gas path is provided with a flow proportional valve and a flow sensor; The controller is also used to control the flow proportional valve to perform an opening and closing ratio adjustment operation according to the airflow flow data collected by the flow sensor until the airflow flow data collected by the flow sensor reaches a first preset airflow.

3. The control system according to claim 1, characterized in that: Also included: a chromatographic column temperature control card plate for collecting the gas flow temperature of the gas chromatographic column; The controller is used to determine the theoretical airflow pressure of the gas chromatography column based on the current airflow temperature, gas chromatography column parameters, and a second preset airflow volume collected by the chromatographic column temperature control card board; and to control the pressure proportional valve to perform an opening and closing ratio adjustment operation when the airflow in the first air path is delivered to the second air path and the third air path until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

4. The control system according to claim 1, characterized in that: The outlet end of the third gas path is connected with an exhaust port; the exhaust port is used to discharge excess air flow in the second gas path.

5. The control system according to claim 1, characterized in that: The gas chromatographic column is a capillary column.

6. A method for controlling the gas flow rate in a gas chromatography column, characterized in that: Applied to control systems; including: Acquiring the current gas flow temperature, current gas flow pressure, and the second preset gas flow rate of the gas chromatograph column; Determining a theoretical gas flow pressure of the gas chromatographic column based on the current gas flow temperature, gas chromatographic column parameters, and the second preset gas flow rate; According to the current airflow pressure and the theoretical airflow pressure, the pressure proportional valve is controlled to perform an opening and closing ratio adjustment operation until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

7. The method according to claim 6, characterized in that The method of determining the theoretical gas flow pressure of the gas chromatographic column based on the current gas flow temperature, gas chromatographic column parameters, and the second preset gas flow rate comprises: Determine a current gas viscosity coefficient corresponding to the current gas temperature based on the current gas temperature and the gas viscosity under standard atmospheric pressure; The theoretical gas flow pressure of the gas chromatographic column is determined based on the second preset gas flow rate, gas chromatographic column parameters, current gas viscosity coefficient, and the current gas flow temperature.

8. The method according to claim 6, characterized in that The method of controlling the pressure proportional valve to perform an opening and closing ratio adjustment operation according to the current airflow pressure and the theoretical airflow pressure until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure comprises: Determining whether the current airflow pressure is greater than the theoretical airflow pressure; If the judgment result indicates that the current airflow pressure is greater than the theoretical airflow pressure, the opening and closing ratio of the pressure proportional valve is adjusted to increase so that the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure; If the judgment result indicates that the current airflow pressure is less than the theoretical airflow pressure, the opening and closing ratio of the pressure proportional valve is adjusted down so that the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

9. The method according to claim 6, characterized in that Obtaining the current gas flow temperature and current gas flow pressure of the gas chromatographic column; including: Determining the current air flow temperature of the gas chromatographic column according to the temperature data collected by the chromatographic column temperature control card plate; The current gas flow pressure of the gas chromatographic column is determined according to the pressure data collected by the pressure sensor.

10. A device for controlling the gas flow rate in a gas chromatography column, characterized in that: include: An acquisition module, used for acquiring the current gas flow temperature and current gas flow pressure of the gas chromatographic column, and the preset gas flow rate of the chromatographic column; A determination module, configured to determine a theoretical gas flow pressure of the gas chromatographic column based on the current gas flow temperature, gas chromatographic column parameters, and a preset gas flow rate of the chromatographic column; The regulating module is used to control the pressure proportional valve to perform an opening and closing ratio regulating operation according to the current airflow pressure and the theoretical airflow pressure until the airflow pressure collected by the pressure sensor reaches the theoretical airflow pressure.

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