Chromatographic carrier gas supply system

Abstract

According to the chromatographic carrier gas supply system, the first gas supply device, the second gas supply device and the gas storage steel cylinder which are connected with the chromatographic instrument set in parallel are arranged to supply carrier gas to the chromatographic instrument set, in the using process, the first gas supply device and the second gas supply device work at the same time to supply the carrier gas to the chromatographic instrument set, and when the gas supply amount of one gas supply device fluctuates, the gas supply amount of the other gas supply device fluctuates. The other group of gas supply devices can perform compensation or buffering, so that the purpose of stable gas supply can be realized, the stability of detection data is ensured, and meanwhile, the arranged gas storage steel cylinder is used as a standby gas source to supply hydrogen to the chromatographic instrument group when the gas supply devices fail, so that the dry burning damage of the instrument is avoided. The chromatographic carrier gas supply system capable of stably supplying gas and improving the fault-tolerant rate of gas supply equipment is provided by the device provided by the utility model through matched use of the equipment.

Description

Technical Field

[0001] This application relates to the field of gas chromatography technology, and more particularly to a chromatographic carrier gas supply system. Background Technology

[0002] Hydrogen is a crucial gas source in gas chromatography analysis. Traditionally, high-pressure steel cylinders are used as the gas source due to their stability. However, the cylinder pressure is often high, around 15 MPa, posing safety risks during handling, storage, and use. Therefore, hydrogen generators are also used as a hydrogen source. This method involves connecting the hydrogen generator to a single chromatograph for hydrogen supply. While more economical, this method suffers from unstable carrier gas supply pressure / flow, significantly impacting data. Furthermore, there is no backup supply in case of generator failure, potentially leading to "dry burning" of the chromatograph and shortening its lifespan. Utility Model Content

[0003] This application provides a chromatographic carrier gas supply system to solve the problems mentioned in the background art.

[0004] This application provides a chromatographic carrier gas supply system, including a chromatograph assembly, which is connected to a first gas supply device, a second gas supply device, and a gas storage cylinder.

[0005] The chromatograph assembly is connected to the first gas supply device in sequence via the first pressure gauge, the first pressure regulating valve, and the first check valve.

[0006] The chromatograph assembly is connected to the second gas supply device in sequence via the second pressure gauge, the second pressure regulating valve, and the second check valve.

[0007] The chromatograph assembly is connected to the gas cylinder in sequence through the third check valve and the pressure reducing valve.

[0008] Optionally, the first gas supply device includes a plurality of first hydrogen generators connected in parallel;

[0009] The second gas supply device includes multiple second hydrogen generators connected in parallel.

[0010] Optionally, the first hydrogen generator, the second hydrogen generator, the first pressure gauge, the second pressure gauge, and the pressure reducing valve are all electrically connected to the controller.

[0011] Optionally, the chromatograph assembly is also connected to an inert gas supply device via a control valve.

[0012] Optionally, the chromatograph assembly is also connected to an exhaust gas treatment system.

[0013] Optionally, the exhaust gas treatment system includes: a first exhaust gas treatment device and a second exhaust gas treatment device;

[0014] The first exhaust gas treatment device includes a paraffin absorption tower and a first activated carbon adsorption tower connected in series.

[0015] The second exhaust gas treatment device includes an incinerator, an alkali absorption tower, and a second activated carbon adsorption tower connected in series.

[0016] The first and second tail gas treatment devices are connected to the chromatograph group via a three-way valve.

[0017] Optionally, the paraffin absorption tower includes a tower body containing paraffin oil, and an air inlet pipe and an exhaust pipe are installed inside the tower body;

[0018] One end of the air intake duct passes through the top of the tower and connects to the three-way valve, while the other end connects to the air distribution plate near the bottom of the tower.

[0019] A filter layer is installed at the top of the tower body. One end of the exhaust pipe passes through the top of the tower body and is connected to the first activated carbon adsorption tower, while the other end is close to the upper surface of the filter layer.

[0020] The chromatographic carrier gas supply system provided in this application supplies carrier gas to the chromatograph group by setting up a first gas supply device, a second gas supply device, and a gas storage cylinder connected in parallel with the chromatograph group. During use, the first and second gas supply devices operate simultaneously to supply carrier gas to the chromatograph group. When the gas supply from one gas supply device fluctuates, the other gas supply device can compensate or buffer, thereby achieving a stable gas supply and ensuring the stability of the detection data. The gas storage cylinder serves as a backup gas source, supplying hydrogen to the chromatograph group in case of a gas supply device failure, preventing the instrument from burning out due to dryness. The device in this application, through the combined use of the above-mentioned equipment, provides a chromatographic carrier gas supply system that can stably supply gas and improve the fault tolerance rate of the gas supply equipment. It overcomes the shortcomings of existing systems that use a single hydrogen generator for hydrogen supply, where the carrier gas supply pressure / flow rate is unstable, significantly affecting the data. Furthermore, the lack of a backup gas supply method when the hydrogen generator fails easily leads to "dry burning" of the chromatograph, affecting the instrument's lifespan. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A schematic diagram of a chromatographic carrier gas supply system provided in an embodiment of this application;

[0023] Figure 2 A schematic diagram of a chromatographic carrier gas supply system provided in another embodiment of this application;

[0024] Figure 3 A schematic diagram of a chromatographic carrier gas supply system provided in yet another embodiment of this application;

[0025] Figure 4 This is a schematic diagram of an exhaust gas treatment system provided in an embodiment of this application;

[0026] Figure 5 This is a schematic diagram of the structure of a paraffin absorption tower provided in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Chromatograph assembly; 2. First gas supply device; 3. Second gas supply device; 4. Gas storage cylinder; 5. Controller; 6. Inert gas supply device; 7. Tail gas treatment system; 10. First pressure gauge; 20. Second pressure gauge; 21. First hydrogen generator; 31. Second hydrogen generator; 71. First tail gas treatment device; 72. Second tail gas treatment device; 100. First pressure regulating valve; 200. First check valve; 300. Second... Pressure stabilizing valve; 400, second check valve; 500, third check valve; 600, pressure reducing valve; 700, control valve; 800, three-way valve; 711, paraffin absorption tower; 7111, tower body; 7112, air inlet duct; 7113, exhaust duct; 7114, air distribution plate; 7115, filter layer; 712, first activated carbon adsorption tower; 721, incinerator; 722, alkali absorption tower; 723, second activated carbon adsorption tower. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions in the embodiments of this application are described clearly and completely below. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are also within the scope of protection of this application.

[0030] like Figure 1 As shown, this application provides a chromatographic carrier gas supply system, including a chromatograph group 1, which is connected to a first gas supply device 2, a second gas supply device 3 and a gas storage cylinder 4.

[0031] The chromatograph assembly 1 is connected to the first gas supply device 2 in sequence through the first pressure gauge 10, the first pressure regulating valve 100, and the first check valve 200;

[0032] The chromatograph assembly 1 is connected to the second gas supply device 3 in sequence through the second pressure gauge 20, the second pressure regulating valve 300, and the second check valve 400.

[0033] The chromatograph assembly 1 is connected to the gas storage cylinder 4 in sequence through the third check valve 500 and the pressure reducing valve 600.

[0034] In this application, the chromatograph group 1 consists of multiple gas chromatographs connected in parallel.

[0035] In normal operation, the system of this application closes the gas storage cylinder 4 and simultaneously connects the first gas supply device 2 and the second gas supply device 3 to the gas path of the chromatograph group 1, supplying hydrogen to the chromatograph group 1. At this time, the first pressure regulating valve 100 is controlled to operate, and the first gas supply device 2 is controlled to generate hydrogen. The generated hydrogen is supplied to the gas path of the chromatograph group 1 for use by the chromatographs. At the same time, the first pressure gauge 10 on the pipeline monitors the gas pressure data in the gas path in real time.

[0036] Similarly, the second pressure regulating valve 300 is controlled to operate (with a constant pressure between 0.3-0.4 MPa, the same as the gas pressure output by the first gas supply device 2), and the second gas supply device 3 is controlled to operate to generate hydrogen. The generated hydrogen is supplied to the gas path of the chromatograph group 1 for use by the chromatograph. At the same time, the second pressure gauge 20 on the pipeline monitors the gas pressure data in the gas path in real time. The check valve in the gas path can prevent backflow of gas supplied by the hydrogen supply device on the other side when the gas pressure supplied by the hydrogen supply device on one side is too low, and can also prevent backflow of gas caused by the chromatograph in the chromatograph group 1 malfunctioning.

[0037] When one or both gas supply devices malfunction or are under maintenance, resulting in unstable hydrogen production, the gas storage cylinder 4 can be opened and the pressure reducing valve 600 can be controlled to use the compressed hydrogen in the gas storage cylinder 4 as a backup gas source for the chromatograph, preventing the chromatograph from burning dry and being damaged.

[0038] The chromatographic carrier gas supply system provided in this application supplies carrier gas to the chromatograph group 1 by setting up a first gas supply device 2, a second gas supply device 3, and a gas storage cylinder 4 connected in parallel with the chromatograph group 1. During use, the first gas supply device 2 and the second gas supply device 3 operate simultaneously to supply carrier gas to the chromatograph group 1. When the gas supply volume of one gas supply device fluctuates, the other gas supply device can compensate or buffer, thereby achieving a stable gas supply and ensuring the stability of the detection data. The gas storage cylinder 4 serves as a backup gas source, supplying hydrogen to the chromatograph group 1 in case of a gas supply device failure, preventing the instrument from burning out due to dryness. The device in this application, through the combined use of the above-mentioned equipment, provides a chromatographic carrier gas supply system that can stably supply gas and improve the fault tolerance rate of the gas supply equipment. It overcomes the shortcomings of existing systems that use a single hydrogen generator for hydrogen supply, where the carrier gas supply pressure / flow rate is unstable, significantly affecting the data. Furthermore, the lack of a backup gas supply method when the hydrogen generator fails easily leads to "dry burning" of the chromatograph, affecting the instrument's lifespan.

[0039] like Figure 1As shown, optionally, the first gas supply device 2 includes a plurality of first hydrogen generators 21 arranged in parallel;

[0040] The second gas supply device 3 includes a plurality of second hydrogen generators 31 connected in parallel.

[0041] In this application, each gas supply device includes multiple hydrogen generators connected in parallel, and the multiple hydrogen generators can be used alternately to reduce the failure rate.

[0042] like Figure 2 As shown, optionally, the first hydrogen generator 21, the second hydrogen generator 31, the first pressure gauge 10, the second pressure gauge 20, and the pressure reducing valve 600 are all electrically connected to the controller 5.

[0043] like Figure 3 As shown, optionally, the chromatograph assembly 1 is also connected to the inert gas supply device 6 via a control valve 700.

[0044] In this application, when it is necessary to use other inert gases (argon, nitrogen) as carrier gases, the controller 5 can control the control valve 700 to open, so that the inert gas stored in the inert gas supply device 6 (such as a steel cylinder storing the corresponding inert gas) can be introduced into the chromatograph group 1 for use.

[0045] like Figure 3 As shown, optionally, the chromatograph group 1 is also connected to the exhaust gas treatment system 7.

[0046] After the sample is analyzed in the chromatograph, the emitted exhaust gas contains the detected substances and cannot be directly discharged. Therefore, the exhaust gas emitted after the chromatograph analyzes the sample needs to be centrally treated. During use, the exhaust gas generated by the chromatograph is discharged into the exhaust gas treatment system 7 for treatment.

[0047] like Figure 4 As shown, optionally, the exhaust gas treatment system 7 includes: a first exhaust gas treatment device 71 and a second exhaust gas treatment device 72.

[0048] The first exhaust gas treatment device 71 includes a paraffin absorption tower 711 and a first activated carbon adsorption tower 712 connected in series.

[0049] The second exhaust gas treatment device 72 includes an incinerator 721, an alkali absorption tower 722, and a second activated carbon adsorption tower 723 connected in series.

[0050] The first tail gas treatment device 71 and the second tail gas treatment device 72 are connected to the chromatograph group 1 via a three-way valve 800.

[0051] In this application, when the carrier gas used is an inert gas such as nitrogen or argon, the three-way valve 800 is switched to connect the first tail gas treatment device 71 and the chromatograph group 1 while blocking the second tail gas treatment device 72. At this time, the tail gas first enters the paraffin absorption tower 711 to absorb the organic matter in the tail gas, and then is discharged into the first activated carbon adsorption tower 712 for adsorption before being discharged.

[0052] When the carrier gas used is a combustible gas such as hydrogen, the three-way valve 800 is switched to connect the second tail gas treatment device 72 and the chromatograph group 1 while blocking the first tail gas treatment device 71. At this time, the tail gas is discharged from the chromatograph group 1 and enters the incinerator 721 for combustion. Since the samples are mostly organic matter, some may contain heteroatoms such as sulfur, phosphorus, and nitrogen. These materials will produce acidic oxides after combustion. Therefore, the gas after combustion is passed into the alkali absorption tower 722 for absorption, and then into the second activated carbon adsorption tower 723 for adsorption before being discharged.

[0053] like Figure 5 As shown, optionally, the paraffin absorption tower 711 includes a tower body 7111 containing paraffin oil, and an air inlet pipe 7112 and an exhaust pipe 7113 are provided inside the tower body 7111.

[0054] One end of the air intake duct 7112 passes through the top of the tower body 7111 and is connected to the three-way valve 800, and the other end is connected to the air distribution plate 7114 near the bottom of the tower body 7111.

[0055] A filter layer 7115 is provided inside the upper part of the tower body 7111. One end of the exhaust pipe 7113 passes through the top of the tower body 7111 and is connected to the first activated carbon adsorption tower 712, while the other end is close to the upper surface of the filter layer 7115.

[0056] In use, the exhaust gas first enters the paraffin absorption tower 711 and is guided from the inlet pipe 7112 to the air distribution plate 7114. Then, it is discharged from the air distribution plate 7114 into the paraffin oil to absorb the organic matter in the exhaust gas. After absorption, the exhaust gas is discharged from the paraffin oil and filtered through the filter medium (filter cotton or filter cloth, etc.) in the filter layer 7115. Finally, it is discharged through the exhaust pipe 7113 into the first activated carbon adsorption tower 712 for adsorption before being discharged.

[0057] A chromatographic carrier gas supply system, the working process of which is as follows:

[0058] During normal use, the gas cylinder 4 and control valve 700 are closed, and the first gas supply device 2 and the second gas supply device 3 are simultaneously connected to the gas path of the chromatograph group 1, supplying hydrogen to the chromatograph group 1 at the same time. At this time, the controller 5 controls the first pressure regulating valve 100 to work and controls the first hydrogen generator 21 in the first gas supply device 2 to work and generate hydrogen. The generated hydrogen is supplied to the gas path of the chromatograph group 1 for use by the chromatograph. At the same time, the first pressure gauge 10 on the pipeline monitors the gas pressure data in the gas path in real time and feeds it back to the controller 5.

[0059] Similarly, controller 5 simultaneously controls the second pressure regulating valve 300 to operate (with a constant pressure between 0.3-0.4 MPa, the same as the gas pressure output by the first gas supply device 2), and controls the second hydrogen generator 31 in the second gas supply device 3 to operate and generate hydrogen. The generated hydrogen is supplied to the gas path of the chromatograph group 1 for use by the chromatograph. At the same time, the second pressure gauge 20 on the pipeline monitors the gas pressure data in the gas path in real time and feeds it back to controller 5. The check valve in the gas path can prevent backflow of gas supplied by the hydrogen supply device on the other side when the gas pressure supplied by the hydrogen supply device on one side is too low, and can also prevent backflow of gas caused by malfunction of the chromatograph in the chromatograph group 1.

[0060] When it is necessary to use other inert gases (argon, nitrogen) as carrier gases, the control valve 700 can be opened by the controller 5 to introduce the inert gas stored in the inert gas supply device 6 (such as a steel cylinder containing the corresponding inert gas) into the chromatograph group 1 for use.

[0061] After the sample is analyzed in the chromatograph, the emitted exhaust gas contains the detected substances and cannot be directly discharged. Therefore, the exhaust gas emitted after the chromatograph analyzes the sample needs to be centrally treated. During use, the exhaust gas generated by the chromatograph is discharged into the exhaust gas treatment system 7 for treatment.

[0062] When the carrier gas used is an inert gas such as nitrogen or argon, switch the three-way valve 800 to connect the first tail gas treatment device 71 and the chromatograph group 1 while blocking the second tail gas treatment device 72. At this time, the tail gas first enters the paraffin absorption tower 711 and is guided from the inlet pipe 7112 to the gas distribution plate 7114. Then, it is discharged from the gas distribution plate 7114 into the paraffin oil to absorb the organic matter in the tail gas. After absorption, the tail gas is discharged from the paraffin oil and filtered through the filter medium (filter cotton or filter cloth, etc.) in the filter layer 7115. Then, it is discharged into the first activated carbon adsorption tower 712 through the exhaust pipe 7113 for adsorption and then discharged.

[0063] When the carrier gas used is a combustible gas such as hydrogen, the three-way valve 800 is switched to connect the second tail gas treatment device 72 and the chromatograph group 1 while blocking the first tail gas treatment device 71. At this time, the tail gas is discharged from the chromatograph group 1 and enters the incinerator 721 for combustion. Since the samples are mostly organic matter, some may contain heteroatoms such as sulfur, phosphorus, and nitrogen. These materials will produce acidic oxides after combustion. Therefore, the gas after combustion is passed into the alkali absorption tower 722 for absorption, and then into the second activated carbon adsorption tower 723 for adsorption before being discharged.

[0064] When one or both gas supply devices malfunction or are under maintenance, resulting in unstable hydrogen production, the gas storage cylinder 4 can be opened and the pressure reducing valve 600 can be controlled by the controller 5 to use the compressed hydrogen in the cylinder as a backup gas source for the chromatograph, preventing the chromatograph from burning dry and being damaged.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A chromatographic carrier gas supply system, comprising a chromatograph assembly (1), characterized in that, The chromatograph assembly (1) is connected to the first gas supply device (2), the second gas supply device (3), and the gas storage cylinder (4), respectively. The chromatograph assembly (1) is connected to the first gas supply device (2) in sequence through the first pressure gauge (10), the first pressure regulating valve (100), and the first check valve (200); The chromatograph assembly (1) is connected to the second gas supply device (3) in sequence through the second pressure gauge (20), the second pressure regulating valve (300), and the second check valve (400); The chromatograph assembly (1) is connected to the gas cylinder (4) in sequence through the third check valve (500) and the pressure reducing valve (600).

2. The chromatographic carrier gas supply system according to claim 1, characterized in that, The first gas supply device (2) includes a plurality of first hydrogen generators (21) connected in parallel. The second gas supply device (3) includes a plurality of second hydrogen generators (31) connected in parallel.

3. The chromatographic carrier gas supply system according to claim 2, characterized in that, The first hydrogen generator (21), the second hydrogen generator (31), the first pressure gauge (10), the second pressure gauge (20), and the pressure reducing valve (600) are all electrically connected to the controller (5).

4. The chromatographic carrier gas supply system according to claim 1, characterized in that, The chromatograph assembly (1) is also connected to the inert gas supply device (6) via a control valve (700).

5. The chromatographic carrier gas supply system according to claim 4, characterized in that, The chromatograph assembly (1) is also connected to the exhaust gas treatment system (7).

6. The chromatographic carrier gas supply system according to claim 5, characterized in that, The exhaust gas treatment system (7) includes: a first exhaust gas treatment device (71) and a second exhaust gas treatment device (72); The first exhaust gas treatment device (71) includes a paraffin absorption tower (711) and a first activated carbon adsorption tower (712) connected in series. The second exhaust gas treatment device (72) includes an incinerator (721), an alkali absorption tower (722), and a second activated carbon adsorption tower (723) connected in series. The first tail gas treatment device (71) and the second tail gas treatment device (72) are connected to the chromatograph group (1) through a three-way valve (800).

7. The chromatographic carrier gas supply system according to claim 6, characterized in that, The paraffin absorption tower (711) includes a tower body (7111) containing paraffin oil, and an air inlet pipe (7112) and an exhaust pipe (7113) are provided inside the tower body (7111). One end of the air intake duct (7112) passes through the top of the tower body (7111) and is connected to the three-way valve (800), and the other end is connected to the air distribution plate (7114) near the bottom of the tower body (7111). A filter layer (7115) is provided inside the upper part of the tower body (7111). One end of the exhaust pipe (7113) passes through the top of the tower body (7111) and is connected to the first activated carbon adsorption tower (712), while the other end is close to the upper surface of the filter layer (7115).

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