Gas path structure of online gas chromatograph for natural gas

Abstract

This utility model belongs to the technical field of natural gas analysis equipment, and discloses a gas path structure for an online natural gas gas chromatograph, including a carrier gas source, a natural gas source, a chromatographic column, a control valve, and a driving gas source. The carrier gas source provides carrier gas. The natural gas source provides natural gas sample gas, which enters the chromatographic column under the carrying capacity of the carrier gas. The control valve has a filling state and an injection state. In the filling state, the carrier gas source is connected to the chromatographic column through the control valve, and the natural gas sample gas enters the control valve. In the injection state, the carrier gas carries the natural gas sample gas from the control valve into the chromatographic column. The driving gas source is connected to the control valve and provides a first driving gas; the natural gas source can also generate a second driving gas. The first driving gas and / or the second driving gas can drive the control valve to switch between the filling state and the injection state. This gas path structure for the online natural gas gas chromatograph can functionally separate the carrier gas and driving gas, improving economic efficiency.

Description

Technical Field

[0001] This utility model relates to the field of natural gas analysis equipment technology, and in particular to a gas path structure for an online gas chromatograph of natural gas. Background Technology

[0002] In an online gas chromatograph for natural gas, the carrier gas is a core component, functioning throughout the entire chromatographic analysis process. The primary function of the carrier gas is to propel the sample gas (the analyte) into the chromatographic column, achieving the separation of its components. The mechanism of action of the carrier gas is as follows: as the mobile phase, it carries the sample gas through the chromatographic column. Within the column, the components of the sample gas are separated due to their different interaction forces with the stationary phase. The carrier gas also drives switching devices such as six-way or ten-way valves, providing auxiliary control. The carrier gas, through pressure, drives the switching devices in the chromatograph, controlling the sample gas injection, backflushing, or column switching processes.

[0003] Existing online gas chromatographs for natural gas typically use helium to propel the sample gas into the column and drive the switching mechanism. This presents several problems: overuse of helium, leading to waste. For example, the driving gas for the existing six-way valve accounts for 75% of the total helium consumption, even though this function does not have high requirements for the properties and types of gas and does not require helium. In other words, existing online gas chromatographs for natural gas cannot achieve gas splitting, resulting in the consumption of relatively expensive helium even when performing simple tasks.

[0004] Therefore, there is an urgent need for a solution to the above problems. Utility Model Content

[0005] The purpose of this invention is to provide a gas path structure for an online gas chromatograph of natural gas, which can functionally separate the carrier gas and driving gas to improve economy.

[0006] To achieve this objective, the present invention adopts the following technical solution:

[0007] The gas path structure of the online gas chromatograph for natural gas includes:

[0008] A carrier gas source, a natural gas source, and a chromatographic column, wherein the carrier gas source is configured to provide carrier gas;

[0009] The natural gas source is configured to provide natural gas sample gas, which can enter the chromatographic column under the carrying of the carrier gas;

[0010] The control valve includes a filling state and an injection state. In the filling state, the carrier gas source is connected to the chromatographic column through the control valve, and the natural gas sample enters the control valve. In the injection state, the carrier gas can carry the natural gas sample in the control valve into the chromatographic column.

[0011] A driving gas source is connected to the driving gas interface of the control valve and is configured to provide a first driving gas; the natural gas source can also generate a second driving gas.

[0012] The first driving gas and / or the second driving gas can drive the control valve to switch between the filling state and the injection state.

[0013] As a preferred embodiment of the gas path structure of the online gas chromatograph for natural gas provided by this utility model, the control valve includes a rotor and a stator. The rotor can rotate relative to the stator under the action of the first driving gas and / or the second driving gas, so that the control valve can switch between the sample filling state and the sample injection state.

[0014] As a preferred embodiment of the gas path structure of the online gas chromatograph for natural gas provided by this utility model, the control valve includes a quantitative loop. In the sample filling state, the natural gas sample gas enters the quantitative loop. In the sample injection state, the carrier gas enters the quantitative loop, carrying the natural gas sample gas in the quantitative loop into the chromatographic column.

[0015] As a preferred embodiment of the gas path structure of the online gas chromatograph of natural gas provided by this utility model, the natural gas source is provided with a first gas path and a second gas path. The first gas path is connected to the driving gas interface and is configured to supply the second driving gas flow. The second gas path is selectively connected to the metering loop and is configured to supply the natural gas sample gas flow to the metering loop.

[0016] As a preferred embodiment of the gas path structure of the online gas chromatograph of natural gas provided by this utility model, a filter is provided in the first gas path, and the filter is configured to filter the second driving gas in the first gas path.

[0017] As a preferred embodiment of the gas path structure of the online gas chromatograph of natural gas provided by this utility model, a pressure relief valve is provided in the first gas path.

[0018] As a preferred embodiment of the gas path structure of the online gas chromatograph of natural gas provided by this utility model, the driving gas source includes a gas cylinder and a pressure tapping pipe that are connected to each other. The gas cylinder contains the first driving gas, and the pressure tapping pipe is connected to the driving gas interface.

[0019] As a preferred embodiment of the gas path structure of the online gas chromatograph of natural gas provided by this utility model, the driving gas interface is provided with a connector, which can be connected to the driving gas source or the natural gas source.

[0020] As a preferred embodiment of the gas path structure of the online gas chromatograph for natural gas provided by this utility model, the carrier gas is helium.

[0021] As a preferred embodiment of the gas path structure of the online gas chromatograph of natural gas provided by this utility model, the first driving gas is nitrogen.

[0022] The beneficial effects of this utility model are:

[0023] The gas path structure of the online gas chromatograph for natural gas provided by this utility model includes a carrier gas source, a natural gas source, a chromatographic column, a control valve, and a driving gas source. The carrier gas source is configured to provide carrier gas. The natural gas source is configured to provide natural gas sample gas, which can enter the chromatographic column under the carrying capacity of the carrier gas. The control valve includes a filling state and an injection state. In the filling state, the carrier gas source is connected to the chromatographic column through the control valve, and the natural gas sample gas enters the control valve. In the injection state, the carrier gas can carry the natural gas sample gas in the control valve into the chromatographic column. The carrier gas provided by the carrier gas source enables smooth gas inlet to the chromatographic column, and the control valve enables flexible control of the gas inlet. The driving gas source is connected to the driving gas interface of the control valve and is configured to provide a first driving gas; the natural gas source can also generate a second driving gas. The first driving gas and / or the second driving gas can drive the control valve to switch between the filling state and the injection state. With the above settings, driving gas is generated using a driving gas source or a natural gas source to drive the control valve. Compared with the existing technology that uses carrier gas for driving, the carrier gas and driving gas can be functionally separated, saving carrier gas and improving the economy of the gas path structure of the natural gas online gas chromatograph. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the content of the embodiments of this utility model and these drawings without creative effort.

[0025] Figure 1 This is a partial schematic diagram of the gas path structure of an online gas chromatograph for natural gas provided in an embodiment of this utility model;

[0026] Figure 2This is a partial schematic diagram of the gas path structure of another online gas chromatograph for natural gas provided in this embodiment of the present invention;

[0027] Figure 3 This is a schematic diagram of the control valve of the gas path structure of the online gas chromatograph of natural gas provided in this embodiment of the present invention in the sample filling state;

[0028] Figure 4 This is a schematic diagram of the control valve of the gas path structure of the online gas chromatograph of natural gas provided in this embodiment of the utility model in the sample injection state.

[0029] In the picture:

[0030] 100. Carrier gas source;

[0031] 200. Natural gas source; 210. First gas line; 211. Filter; 212. Pressure relief valve; 220. Second gas line;

[0032] 300, chromatographic column;

[0033] 400, Control valve; 410, Metering ring; 420, First valve port; 430, Second valve port; 440, Third valve port; 450, Fourth valve port; 460, Fifth valve port; 470, Sixth valve port;

[0034] 500. Drive gas source; 510. Gas cylinder; 520. Pressure tapping pipe;

[0035] 600. Connectors;

[0036] 700, Discharge pipe. Detailed Implementation

[0037] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of this utility model, it should be noted that the terms "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are used only for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0042] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "connect," and "fix" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0043] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0044] In this embodiment, the term "and / or" is merely a description of the relationship between associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this invention, the character " / " generally indicates that the preceding and following associated objects have an "or" relationship.

[0045] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0046] Figure 1 This diagram shows a partial schematic of the gas path structure of an online gas chromatograph for natural gas provided in an embodiment of the present invention. (Refer to...) Figure 1 This embodiment provides a gas path structure for an online gas chromatograph of natural gas, including a carrier gas source 100, a natural gas source 200, a chromatographic column 300, and a control valve 400. The carrier gas source 100 is configured to provide carrier gas. The natural gas source 200 is configured to provide natural gas sample gas, which can enter the chromatographic column 300 under the carrying of the carrier gas. The control valve 400 includes a filling state and an injection state. In the filling state, the carrier gas source 100 is connected to the chromatographic column 300 through the control valve 400, and the natural gas sample gas enters the control valve 400. In the injection state, the carrier gas can carry the natural gas sample gas in the control valve 400 into the chromatographic column 300. The natural gas source 200 can generate a second driving gas, which can drive the control valve 400 to switch between the filling state and the injection state.

[0047] Figure 2 This diagram shows a partial schematic of the gas path structure of another online gas chromatograph for natural gas provided in an embodiment of the present invention. (Refer to...) Figure 2 Another gas path structure for an online gas chromatograph for natural gas provided in this embodiment includes a carrier gas source 100, a natural gas source 200, a chromatographic column 300, a control valve 400, and a driving gas source 500. The driving gas source 500 is connected to the driving gas interface of the control valve 400 and is configured to provide a first driving gas. This first driving gas can drive the control valve 400 to switch between the sample filling state and the sample injection state.

[0048] The carrier gas provided by the aforementioned carrier gas source 100 enables smooth gas intake into the chromatographic column 300, and the control valve 400 allows for flexible control of the gas intake process into the chromatographic column 300. Furthermore, this configuration utilizes the driving gas source 500 or the natural gas source 200 to generate driving gas for driving the control valve 400. Compared to the prior art's use of carrier gas for driving, this configuration allows for functional separation of the carrier gas and driving gas, saving carrier gas and improving the economic efficiency of the gas path structure of this online natural gas gas chromatograph.

[0049] Alternatively, in this embodiment, the carrier gas is helium.

[0050] Alternatively, in this embodiment, the first driving gas is nitrogen.

[0051] It should be noted that the control valve 400 includes a rotor and a stator. The rotor can rotate relative to the stator under the action of the first driving gas and / or the second driving gas, so that the control valve 400 can switch between the sample filling state and the sample injection state.

[0052] Figure 3 This diagram illustrates the control valve of the gas path structure of the online gas chromatograph of natural gas provided in this embodiment of the present invention in the sample filling state. Figure 4 This diagram illustrates the control valve of the online gas chromatograph for natural gas provided in an embodiment of the present invention in the sample injection state. (Refer to...) Figure 3 and Figure 4 The control valve 400 includes a metering loop 410. In the sample filling state, the natural gas sample enters the metering loop 410. In the sample injection state, the carrier gas enters the metering loop 410, carrying the natural gas sample in the metering loop 410 into the chromatographic column 300.

[0053] Continue to refer to Figure 1 and Figure 2 The natural gas source 200 is provided with a first gas path 210 and a second gas path 220. The first gas path 210 is connected to the driving gas interface and is configured to supply the second driving gas. The second gas path 220 is selectively connected to the metering loop 410 and is configured to supply the natural gas sample gas to the metering loop 410.

[0054] Specifically, a filter 211 is provided in the first air passage 210, and the filter 211 is configured to filter the second driving air in the first air passage 210. Through the filter 211, the cleanliness of the second driving air can be improved, avoiding blockage and damage to the internal structure of the control valve 400.

[0055] More specifically, a pressure relief valve 212 is provided in the first air passage 210. Through this pressure relief valve 212, excessive pressure in the first air passage 210 can be released in a timely manner to ensure safety.

[0056] More specifically, the driving gas source 500 includes a gas cylinder 510 and a pressure tapping pipe 520 that are interconnected. The gas cylinder 510 contains the first driving gas, and the pressure tapping pipe 520 is connected to the driving gas interface. It should be noted that after connecting the pressure tapping pipe 520 to the driving gas interface, the pressure of the first driving gas needs to be adjusted to 0.4-0.6 MPa.

[0057] Continue to refer to Figure 1 and Figure 2The driving gas interface is equipped with a connector 600. This connector 600 can be connected to the driving gas source 500 or the natural gas source 200. In this embodiment, the connector 600 can specifically be a modular connecting valve or similar structure, connected to the driving gas interface. The first gas passage 210 of the natural gas source 200 or the pressure tap 520 of the driving gas source 500 can be detachably connected to the connecting valve, thus opening the driving gas passage.

[0058] In another embodiment, the second driving gas can be provided by the natural gas source 200, or the driving gas source 500 can be provided simultaneously to provide the first driving gas. In this case, only the specific structure of the connector 600 needs to be improved to design a structure similar to a tee.

[0059] Specifically, the control valve 400 is provided with a first valve port 420, a second valve port 430, a third valve port 440, a fourth valve port 450, a fifth valve port 460, and a sixth valve port 470 in a circumferential direction. The carrier gas source 100 is connected to the first valve port 420, the chromatographic column 300 is connected to the second valve port 430, the two ends of the metering loop 410 are respectively connected to the third valve port 440 and the sixth valve port 470, the fourth valve port 450 is connected to the discharge pipe 700, and the second gas passage 220 is connected to the fifth valve port 460.

[0060] When the control valve 400 is in the sample filling state, the first valve port 420 and the second valve port 430 are interconnected, the third valve port 440 and the fourth valve port 450 are interconnected, and the fifth valve port 460 and the sixth valve port 470 are interconnected.

[0061] At this time, the first valve port 420 is connected to the second valve port 430, allowing the carrier gas to flow into the chromatographic column 300 to establish a stable flow path. Simultaneously, the natural gas sample gas enters the metering loop 410 through the second gas path 220, the fifth valve port 460, and the sixth valve port 470. Excess natural gas sample gas in the metering loop 410 flows to the discharge pipe 700 through the third valve port 440 and the fourth valve port 450, which is connected to the recovery device.

[0062] When the rotor of the control valve 400 rotates 60° clockwise under the action of the first or second driving gas, the control valve 400 switches to the sample injection state, the first valve port 420 and the sixth valve port 470 are connected to each other, the fourth valve port 450 and the fifth valve port 460 are connected to each other, and the second valve port 430 and the third valve port 440 are connected to each other.

[0063] At this time, the carrier gas in the carrier gas source 100 can sequentially pass through the first valve port 420 and the sixth valve port 470 into the metering loop 410, carrying the natural gas sample gas in the metering loop 410 to the third valve port 440, and then through the second valve port 430 into the chromatographic column 300.

[0064] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make various obvious changes, readjustments, and substitutions without departing from the protection scope of this utility model. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model.

Claims

1. The gas path structure of the natural gas on-line gas chromatograph analyzer, characterized in that, include: The carrier gas source (100), the natural gas source (200), and the chromatographic column (300) are configured to provide carrier gas. The natural gas source (200) is configured to provide natural gas sample gas, which is able to enter the chromatographic column (300) under the carrying of the carrier gas; A control valve (400) includes a filling state and an injection state. In the filling state, the carrier gas source (100) is connected to the chromatographic column (300) through the control valve (400), and the natural gas sample enters the control valve (400). In the injection state, the carrier gas can carry the natural gas sample in the control valve (400) into the chromatographic column (300). A drive air source (500) is connected to the drive air port of the control valve (400) and is configured to provide a first drive air. The natural gas source (200) can also generate a second driving gas; The first driving gas and / or the second driving gas can drive the control valve (400) to switch between the filling state and the injection state.

2. The gas path structure of an on-line gas chromatograph for natural gas according to claim 1, characterized by, The control valve (400) includes a rotor and a stator, the rotor being rotatable relative to the stator under the action of the first driving gas and / or the second driving gas, so that the control valve (400) can switch between the filling state and the injection state.

3. The gas path structure of an on-line gas chromatograph for natural gas according to claim 1, characterized in that, The control valve (400) includes a metering loop (410). In the sample filling state, the natural gas sample enters the metering loop (410). In the sample injection state, the carrier gas enters the metering loop (410), carrying the natural gas sample in the metering loop (410) into the chromatographic column (300).

4. The gas path structure of the on-line gas chromatograph for natural gas according to claim 3, characterized in that, The natural gas source (200) is provided with a first gas path (210) and a second gas path (220). The first gas path (210) is connected to the driving gas interface and is configured to supply the second driving gas. The second gas path (220) is selectively connected to the metering loop (410) and is configured to supply the natural gas sample gas to the metering loop (410).

5. The gas path structure of an on-line gas chromatograph for natural gas according to claim 4, wherein A filter (211) is provided in the first air passage (210), and the filter (211) is configured to filter the second driving air in the first air passage (210).

6. The gas path structure of an on-line gas chromatograph for natural gas according to claim 4, wherein A pressure relief valve (212) is provided in the first air passage (210).

7. The gas path structure of an on-line gas chromatograph for natural gas according to claim 1, wherein The driving gas source (500) includes a gas cylinder (510) and a pressure tapping pipe (520) that are connected to each other. The gas cylinder (510) contains the first driving gas, and the pressure tapping pipe (520) is connected to the driving gas interface.

8. The gas path structure of an on-line gas chromatograph for natural gas according to claim 1, wherein The driving gas interface is provided with a connector (600), which can be connected to the driving gas source (500) or the natural gas source (200).

9. The gas path structure of the online gas chromatograph for natural gas according to any one of claims 1-8, characterized in that, The carrier gas is helium.

10. The gas path structure of an on-line gas chromatograph for natural gas according to any one of claims 1 to 8, characterized in that, The first driving gas is nitrogen.

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