Natural gas all-component analysis device and method

Abstract

The invention provides a natural gas all-component analysis device and method, and relates to the technical field of natural gas analys.The natural gas all-component analysis device comprises a column box, a plurality of branch gas inlet pipes fixedly communicate with one side of the top end of the column box, and a parallel chromatographic column system is arranged in an inner cavity of the column box; the middle part of the top end of an inner cavity of the column box is fixedly connected with a plurality of suspension brackets for reinforcing the parallel chromatographic column system, the side surface of the column box is provided with a multi-stage filtering mechanism for filtering natural gas, and one end of each branch gas inlet pipe is fixedly connected with a carrier gas inlet pipe; the parallel chromatographic column system formed by connecting a plurality of chromatographic column bodies in parallel is suitable for natural gas with complex components, and the problem of incomplete separation or interference possibly existing in a single chromatographic column is effectively reduced, so that the accuracy of an analysis result of the device is improved; a natural gas sample which is just mined is filtered through the multi-stage filtering mechanism, and the problem that solid particles, liquid water and other impurities possibly contained in natural gas can block filler in the column is solved.

Description

Technical Field

[0001] This invention relates to the field of natural gas component analysis technology, and in particular to a device and method for analyzing the complete components of natural gas. Background Technology

[0002] Natural gas is a multi-component mixed gaseous fossil fuel. As a clean and efficient energy source, it has a complex composition, including hydrocarbons such as methane, ethane, and propane, as well as non-hydrocarbon components such as nitrogen, carbon dioxide, and sulfides. The content of each component directly affects key parameters of natural gas such as calorific value, density, and combustion performance, thereby affecting energy utilization efficiency, production safety, and environmental compliance. Therefore, accurate analysis of the full composition of natural gas is a core requirement in the energy industry, chemical production, and environmental monitoring.

[0003] However, traditional natural gas analysis mainly relies on chemical analysis methods or single detection techniques, usually using a single chromatographic column to separate natural gas samples. When the natural gas composition is complex, the single chromatographic column may have problems such as incomplete separation or interference, affecting the accuracy of the analysis results. It is not suitable for natural gas with complex components or situations that require rapid analysis of a large number of samples. At the same time, newly extracted natural gas may contain impurities such as particles, causing problems such as blockage in the chromatographic column, affecting the separation or analysis effect of natural gas samples. Summary of the Invention

[0004] The problem this invention aims to solve is that traditional single-column detection methods may suffer from incomplete separation or interference, affecting the accuracy of analytical results. This makes them unsuitable for natural gas with complex components and for the rapid analysis of large numbers of samples. Furthermore, impurities in natural gas can easily cause blockages.

[0005] To address the aforementioned technical problems, this invention provides a natural gas full component analysis device, comprising a column box, with several branch gas inlet pipes fixedly connected to one side of the top of the column box, a parallel chromatographic column system installed inside the column box, several suspension brackets for reinforcing the parallel chromatographic column system fixedly connected to the middle of the top of the column box, a multi-stage filtration mechanism for filtering natural gas installed on the side of the column box, and a carrier gas inlet pipe fixedly connected to one end of each branch gas inlet pipe; The parallel chromatographic column system includes several injection tubes disposed in the inner cavity of the column oven. The output end of the injection tube is fixedly connected to the chromatographic column body, and the end of the chromatographic column body away from the injection tube is fixedly connected to the outlet tube. The multi-stage filtration mechanism includes a cyclone separator for filtering particles in natural gas. The output end of the cyclone separator is fixedly connected to a clean gas outlet pipe. A filter element is installed on one side of the inner cavity of the clean gas outlet pipe, and a fan is installed on the side of the inner cavity of the clean gas outlet pipe away from the filter element.

[0006] Preferably, the top end of the injection tube is fixedly connected to a sealing sleeve, the top end of the injection tube is fixedly connected to the bottom end of the gas inlet tube through the sealing sleeve, and a liner is fixedly connected to the inner cavity of the injection tube.

[0007] Preferably, the injection tubes are designed at equal intervals, the middle part of the chromatographic column body is set in a spiral shape, and the spiral part of the chromatographic column body is wrapped around the surface of the suspension frame.

[0008] Preferably, the end of the clean air outlet pipe away from the cyclone separator is fixedly connected to the main air inlet pipe, the bottom end of the main air inlet pipe is fixedly connected to several branch pipes, the end of the branch pipe away from the main air inlet pipe is connected to the top end of the branch air inlet pipe, the branch air inlet pipe is provided with a first gas control valve, and the main air inlet pipe is provided with a second gas control valve.

[0009] Preferably, a carrier gas cylinder is also provided on the side of the column box, and a carrier gas outlet pipe is fixedly connected to the output end of the carrier gas cylinder. A third gas control valve is installed on the carrier gas outlet pipe, and the carrier gas outlet pipe is connected to the carrier gas inlet pipe.

[0010] Preferably, the column box is fixedly connected to a support base and an arc-shaped fixing frame at one end near the carrier gas cylinder. The top of the support base is provided with a limit groove, and one end of the arc-shaped fixing frame is provided with an arc-shaped limit ring.

[0011] Preferably, the arc-shaped limiting ring is connected to the arc-shaped fixing frame using bolts or other connecting parts, the bottom end of the carrier gas cylinder is located in the inner cavity of the limiting groove, and the upper part of the carrier gas cylinder is located in the inner cavity of the arc-shaped fixing frame and the arc-shaped limiting ring.

[0012] Preferably, a detector for detecting natural gas components is installed on the other side of the top of the column box, and the bottom of the detector is provided with several gas inlet detection inlets, and the sample outlet tube is connected to the gas inlet detection inlets.

[0013] This invention also provides a method for full component analysis of natural gas, comprising the following steps: Step 1: First, the extracted natural gas is connected to the input end of the cyclone separator through a pipeline. First, the particles are separated from the airflow by centrifugal force in the inner cavity of the cyclone separator. Then, the fine particles and residual droplets are further filtered through the filter element. At the same time, the fan is started to increase the flow rate and volume of the gas through the filter element. The filtered sample gas enters the inner cavity of the sample inlet tube from the main inlet pipe through several branch pipes connected at the bottom. Step 2: Carrier gas is supplied through a carrier gas cylinder. The third gas control valve controls the closing of the carrier gas cylinder. The carrier gas flows through the carrier gas outlet pipe to the inner cavity of several connected carrier gas inlet pipes. The carrier gas flows from several carrier gas inlet pipes to the corresponding connected branch inlet pipes and enters the liner of the sample inlet tube along with the natural gas sample through the branch inlet pipes. Step 3: After filtration, the gas enters the main inlet pipe from the clean gas outlet pipe, and then enters the sample injection tube cavity through several branch pipes connected at the bottom of the main inlet pipe. According to the detection requirements, the closure of the sample injection tube is controlled by the first gas control valve, so that the natural gas sample can enter the chromatographic column body through the sample injection tube for separation. Step 4: The natural gas sample enters different chromatographic columns through multiple inlet pipes for separation. The outlet pipe of each chromatographic column is connected to the corresponding inlet of the detector. Finally, the gas components separated in several outlet pipes enter the detector through the corresponding inlet detection inlet. After passing through the detector in sequence, the full component analysis results of the natural gas are obtained.

[0014] The technical effects and advantages of this invention are as follows: This invention utilizes a parallel chromatographic column system composed of several parallel chromatographic column bodies to separate natural gas samples. The samples enter their respective injection tubes through different inlet tubes. Multiple helical chromatographic column bodies with different separation characteristics are used, with each column body responsible for separating a specific type of component. This effectively reduces the potential for incomplete separation or interference that may occur with a single column, thereby improving the accuracy of the analytical results. At the same time, the helical shape of the column bodies reduces space and improves the separation effect between the natural gas sample and the packing material inside the column body. The suspension frame suspends and supports the middle part of the column body, ensuring the stability of the helical column section and preventing deformation or displacement of the gas under the impact of the internal cavity.

[0015] This invention filters freshly extracted natural gas samples using a multi-stage filtration system. The natural gas entering the parallel chromatographic column system first undergoes centrifugal force separation of particles from the gas stream within a cyclone separator. It then passes through a filter element for further filtration of tiny particles and residual droplets. Since the gas velocity decreases upon entering the filter element, potentially affecting filtration efficiency and flow rate, a blower is activated to increase the gas velocity and flow rate through the filter element. After filtration, the gas enters the main inlet pipe from the clean gas outlet. During this flow, the blower further increases the gas velocity and flow rate into the main inlet pipe. The gas then flows from the main inlet pipe through several branch pipes connected at the bottom into the sample injection tube, allowing the natural gas sample to pass through the sample injection tube into the chromatographic column for separation. This avoids the problem of impurities such as solid particles and liquid water in the natural gas clogging the column packing.

[0016] This invention features multiple gas inlets and gas channels to receive components from different chromatographic columns. The outlet pipe of each column is connected to the corresponding inlet of the detector, ensuring that each component can enter the detector independently for detection. Using independent pipes can prevent components separated from different columns from mixing or interfering before entering the detector, which helps maintain the separation effect of each component and improves the accuracy and reliability of the analysis. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the parallel chromatographic column system of the present invention.

[0019] Figure 3 This is a schematic diagram of the multi-stage filtration mechanism of the present invention.

[0020] Figure 4 This is a schematic diagram of the overall cross-sectional structure of the present invention.

[0021] Figure 5 For the present invention Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0022] Figure 6 This is a schematic diagram of the overall structure of the present invention from another perspective.

[0023] The attached figures are labeled as follows: 1. Column oven; 2. Inlet pipe; 3. Parallel chromatographic column system; 31. Injection tube; 32. Column body; 33. Outlet tube; 34. Sealing sleeve; 35. Liner; 4. Hanger; 5. Multi-stage filtration mechanism; 51. Cyclone separator; 52. Clean gas outlet pipe; 53. Filter element; 54. Fan; 55. Main inlet pipe; 56. Diverter pipe; 57. Second gas control valve; 6. Carrier gas inlet pipe; 7. First gas control valve; 8. Carrier gas cylinder; 9. Carrier gas outlet pipe; 10. Third gas control valve; 11. Support base; 12. Arc-shaped fixing frame; 13. Limiting groove; 14. Arc-shaped limiting ring; 15. Detector; 16. Inlet detection inlet. Detailed Implementation

[0024] This invention provides a natural gas full-component analysis device, such as... Figure 1 - Figure 6 As shown, the system includes a column oven 1, with several branch gas inlet pipes 2 fixedly connected to one side of the top of the column oven 1. A parallel chromatographic column system 3 is installed inside the column oven 1. Several suspension brackets 4 for reinforcing the parallel chromatographic column system 3 are fixedly connected to the middle of the top of the column oven 1. A multi-stage filtration mechanism 5 for filtering natural gas is installed on the side of the column oven 1. One end of each branch gas inlet pipe 2 is fixedly connected to a carrier gas inlet pipe 6.

[0025] Furthermore, such as Figure 1 and Figure 2 As shown, the parallel chromatographic column system 3 includes several injection tubes 31 disposed inside the column oven 1. The output end of the injection tube 31 is fixedly connected to a spiral chromatographic column body 32, and the end of the spiral chromatographic column body 32 away from the injection tube 31 is fixedly connected to an outlet tube 33. Since natural gas is a multi-component mixed gaseous fossil fuel, including various types of gases, several spiral chromatographic column bodies 32 are arranged in parallel for natural gas samples with complex components. This can effectively improve the separation effect and analytical accuracy. The sample enters the corresponding injection tube 31 through different gas inlet tubes 2. By using multiple spiral chromatographic column bodies 32 with different separation characteristics, each spiral chromatographic column body 32 is responsible for separating a specific type of component, effectively reducing the incomplete separation or interference problems that may exist with a single chromatographic column, thereby improving the accuracy of the device's analytical results.

[0026] Furthermore, such as Figure 1 and Figure 3 As shown, the multi-stage filtration mechanism 5 includes a cyclone separator 51 for filtering particles in natural gas. The output end of the cyclone separator 51 is fixedly connected to a clean gas outlet pipe 52. A filter element 53 is installed on one side of the inner cavity of the clean gas outlet pipe 52, and a blower 54 is installed on the side of the inner cavity of the clean gas outlet pipe 52 away from the filter element 53. Since natural gas may contain impurities such as solid particles and liquid water, which may clog the packing material in the column and interfere with the separation and detection of target components, the natural gas entering the parallel chromatographic column system 3 first needs to be filtered by the multi-stage filtration mechanism 5. First, the particles are separated from the gas flow by centrifugal force in the inner cavity of the cyclone separator 51. Then, the particles and residual droplets are further filtered by the filter element 53. Since the gas velocity will decrease when it enters the filter element 53, it is easy to affect the gas filtration effect and flow rate. Therefore, the blower 54 is set to increase the gas velocity and flow rate through the filter element 53.

[0027] Furthermore, such as Figure 2 , Figure 4 and Figure 5 As shown, a sealing sleeve 34 is fixedly connected to the top end of the injection tube 31. The top end of the injection tube 31 is fixedly connected to the bottom end of the gas inlet tube 2 through the sealing sleeve 34. A liner 35 is fixedly connected to the inner cavity of the injection tube 31. The sealing sleeve 34 increases the sealing at the connection between the injection tube 31 and the gas inlet tube 2 to avoid leakage during transmission. At the same time, the liner 35 added to the inner cavity of the injection tube 31 reduces the direct contact between the sample and the injection tube 31, inhibits gas diffusion, and ensures that the gas can accurately and quickly enter the chromatographic column body 32.

[0028] Furthermore, such as Figure 2 and Figure 4As shown, several injection tubes 31 are designed at equal intervals, and the middle part of the chromatographic column body 32 is set in a spiral shape. The spiral part of the chromatographic column body 32 is wrapped around the surface of the suspension frame 4. Winding the chromatographic column body 32 into a spiral shape can reduce space and improve the separation effect of natural gas sample and the packing material inside the chromatographic column body 32. At the same time, the suspension frame 4 is added to suspend and support the middle part of the chromatographic column body 32, ensuring the stability of the spiral column part and preventing the gas from deforming or displacing under the impact of its inner cavity.

[0029] Furthermore, such as Figure 3 and Figure 6 As shown, the end of the clean gas outlet pipe 52 away from the cyclone separator 51 is fixedly connected to the main inlet pipe 55. The bottom end of the main inlet pipe 55 is fixedly connected to several branch pipes 56. The end of the branch pipe 56 away from the main inlet pipe 55 is connected to the top end of the branch inlet pipe 2. A first gas control valve 7 is installed on the branch inlet pipe 2, and a second gas control valve 57 is installed on the main inlet pipe 55. After filtration, the gas enters the main inlet pipe 55 from the clean gas outlet pipe 52. During the flow, the flow rate and flow volume of the gas entering the main inlet pipe 55 are increased by the fan 54. Then, the gas enters the inner cavity of the sample injection tube 31 from the main inlet pipe 55 through the several branch pipes 56 connected at the bottom end. According to the detection requirements, the first gas control valve 7 controls the closure of the sample injection tube 31, so that the natural gas sample can enter the chromatographic column body 32 through the sample injection tube 31 for separation processing.

[0030] Furthermore, such as Figure 1 As shown, a carrier gas cylinder 8 is also provided on the side of the column box 1. The output end of the carrier gas cylinder 8 is fixedly connected to a carrier gas outlet pipe 9. A third gas control valve 10 is installed on the carrier gas outlet pipe 9. The carrier gas outlet pipe 9 is connected to the carrier gas inlet pipe 6. The carrier gas cylinder 8 provides high-purity inert gas as carrier gas, which plays the role of carrying sample components through the chromatographic column in chromatographic analysis. At the same time, the third gas control valve 10 controls the closing of the carrier gas cylinder 8. The carrier gas flows through the carrier gas outlet pipe 9 to the inner cavity of several connected carrier gas inlet pipes 6, providing a stable and continuous airflow to ensure that the separation effect of sample components in the chromatographic column body 32 is consistent and to prevent certain components in the natural gas sample from undergoing oxidation or decomposition reactions during the analysis process.

[0031] Furthermore, such as Figure 1 As shown, a support base 11 and an arc-shaped fixing frame 12 are fixedly connected to one end of the column box 1 near the carrier gas cylinder 8. A limit groove 13 is opened at the top of the support base 11, and an arc-shaped limit ring 14 is provided at one end of the arc-shaped fixing frame 12. The position of the carrier gas cylinder 8 is fixed by the support base 11 and the arc-shaped fixing frame 12.

[0032] Furthermore, such as Figure 1As shown, the arc-shaped limiting ring 14 is connected to the arc-shaped fixing frame 12 by bolts and other connecting parts. The bottom end of the gas cylinder 8 is located in the inner cavity of the limiting groove 13, and the upper part of the gas cylinder 8 is located in the inner cavity of the arc-shaped fixing frame 12 and the arc-shaped limiting ring 14. Since the bottom of the gas cylinder 8 is usually arc-shaped, the limiting groove 13 increases the stability of the gas cylinder 8 when it is fixed. After the gas cylinder 8 is placed, the arc-shaped limiting ring 14 is sleeved on the surface of the gas cylinder 8 and connected to the arc-shaped fixing frame 12 by bolts and other connecting parts to reinforce the gas cylinder 8 and ensure the stability of the gas cylinder 8 during use, so that the device can also be used in outdoor environments.

[0033] Furthermore, such as Figure 1 and Figure 4 As shown, a detector 15 for detecting natural gas components is installed on the other side of the top of the column oven 1. Several gas inlet detection inlets 16 are provided at the bottom of the detector 15. The sample outlet tube 33 is connected to the gas inlet detection inlets 16. The detector 15, referring to the GC-620 gas chromatograph in the prior art, uses multiple gas inlet detection inlets 16 and gas channels to receive components from different chromatographic column bodies 32. The outlet pipe of each chromatographic column body 32 is connected to the corresponding inlet of the detector 15, ensuring that each component can enter the detector 15 independently for detection. Using independent pipes can avoid the components separated from different chromatographic columns from mixing or interfering before entering the detector 15, which helps to maintain the separation effect of each component and improve the accuracy and reliability of the analysis.

[0034] This invention also provides a method for the complete component analysis of natural gas, such as... Figure 1 - Figure 6 As shown, it includes the following steps: Step 1: First, the extracted natural gas is connected to the input end of the cyclone separator 51 through a pipeline, so that the natural gas sample to be tested is transported to the inner cavity of the cyclone separator 51. First, the particles are separated from the airflow by centrifugal force in the inner cavity of the cyclone separator 51. Then, the small particles and residual droplets are further filtered through the filter element 53. At the same time, the blower 54 is started to increase the flow rate and flow of the gas through the filter element 53. The filtered sample gas enters the main inlet pipe 55 and enters the inner cavity of the corresponding sample inlet pipe 31 through several diversion pipes 56 connected to its bottom end. According to the testing requirements, the closure of the sample inlet pipe 31 is controlled by the first gas control valve 7. Step 2: High-purity inert gas is provided by carrier gas cylinder 8 as carrier gas, which plays the role of carrying sample components through the chromatographic column in chromatographic analysis. At the same time, the closure of carrier gas cylinder 8 is controlled by the third gas control valve 10. The carrier gas flows through the carrier gas outlet pipe 9 to the inner cavity of several connected carrier gas inlet pipes 6, providing a stable and continuous airflow. The carrier gas flows from several carrier gas inlet pipes 6 to the corresponding connected branch inlet pipes 2, and together with the natural gas sample, enters the liner 35 of the inner cavity of the sample injection tube 31 through the branch inlet pipe 2. Step 3: After filtration, the gas enters the main inlet pipe 55 from the clean gas outlet pipe 52. During the flow, the flow rate and volume of the gas entering the main inlet pipe 55 are increased by the fan 54. Then, the gas enters the inner cavity of the sample injection tube 31 from the main inlet pipe 55 through several branch pipes 56 connected at the bottom. According to the detection requirements, the closure of the sample injection tube 31 is controlled by the first gas control valve 7, so that the natural gas sample can enter the chromatographic column body 32 through the sample injection tube 31 and be separated from the packing material. Step 4: The natural gas sample enters different chromatographic column bodies 32 through multiple inlet pipes 2 for separation, and the outlet pipe of each chromatographic column body 32 is connected to the corresponding inlet of the detector 15 to ensure that each component can enter the detector 15 independently for detection. Using independent pipes can avoid the mixing or interference of components separated from different chromatographic columns before entering the detector 15, which helps to maintain the separation effect of each component and improve the accuracy and reliability of the analysis. Finally, the gas components separated in several sample outlet pipes 33 enter the detector 15 through the corresponding inlet detection inlet 16, and the final result of the full component analysis of natural gas is obtained after sequential detection.

[0035] It is understood that the present invention has been described through some embodiments, which are known to those skilled in the art. Various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A natural gas full component analysis device, comprising a column oven (1), characterized in that: The top of the column box (1) is fixedly connected to several gas inlet pipes (2). The inner cavity of the column box (1) is equipped with a parallel chromatographic column system (3). The top center of the inner cavity of the column box (1) is fixedly connected to several suspension brackets (4) for reinforcing the parallel chromatographic column system (3). The side of the column box (1) is equipped with a multi-stage filtration mechanism (5) for filtering natural gas. One end of each gas inlet pipe (2) is fixedly connected to a carrier gas inlet pipe (6). The parallel chromatographic column system (3) includes several injection tubes (31) disposed in the inner cavity of the column oven (1). The output end of the injection tube (31) is fixedly connected to the chromatographic column body (32), and the end of the chromatographic column body (32) away from the injection tube (31) is fixedly connected to the outlet tube (33). The multi-stage filtration mechanism (5) includes a cyclone separator (51) for filtering particles in natural gas. The output end of the cyclone separator (51) is fixedly connected to a clean gas outlet pipe (52). A filter element (53) is installed on one side of the inner cavity of the clean gas outlet pipe (52), and a blower (54) is installed on the side of the inner cavity of the clean gas outlet pipe (52) away from the filter element (53).

2. The natural gas full-component analysis device according to claim 1, characterized in that: The top end of the injection tube (31) is fixedly connected to a sealing sleeve (34), and the top end of the injection tube (31) is fixedly connected to the bottom end of the gas inlet tube (2) through the sealing sleeve (34). The inner cavity of the injection tube (31) is fixedly connected to a liner tube (35).

3. The natural gas full-component analysis device according to claim 1, characterized in that: The injection tubes (31) are designed at equal intervals, and the middle part of the chromatographic column body (32) is set in a spiral shape. The spiral part of the chromatographic column body (32) is wrapped around the surface of the suspension frame (4).

4. The natural gas full-component analysis device according to claim 1, characterized in that: The end of the clean air outlet pipe (52) away from the cyclone separator (51) is fixedly connected to the main air inlet pipe (55). The bottom end of the main air inlet pipe (55) is fixedly connected to several branch pipes (56). The end of the branch pipe (56) away from the main air inlet pipe (55) is connected to the top end of the branch air inlet pipe (2). The branch air inlet pipe (2) is equipped with a first gas control valve (7), and the main air inlet pipe (55) is equipped with a second gas control valve (57).

5. The natural gas full-component analysis device according to claim 1, characterized in that: The side of the column box (1) is also provided with a carrier gas cylinder (8), the output end of the carrier gas cylinder (8) is fixedly connected to a carrier gas outlet pipe (9), a third gas control valve (10) is installed on the carrier gas outlet pipe (9), and the carrier gas outlet pipe (9) is connected to the carrier gas inlet pipe (6).

6. The natural gas full-component analysis device according to claim 1, characterized in that: The column box (1) is fixedly connected to a support base (11) and an arc-shaped fixing frame (12) at one end near the carrier gas cylinder (8). The top of the support base (11) is provided with a limiting groove (13), and one end of the arc-shaped fixing frame (12) is provided with an arc-shaped limiting ring (14).

7. A natural gas full-component analysis device according to claim 6, characterized in that: The arc-shaped limiting ring (14) is connected to the arc-shaped fixing frame (12) by bolts and other connecting parts. The bottom end of the gas cylinder (8) is located in the inner cavity of the limiting groove (13), and the upper part of the gas cylinder (8) is located in the inner cavity of the arc-shaped fixing frame (12) and the arc-shaped limiting ring (14).

8. A natural gas full-component analysis device according to claim 1, characterized in that: A detector (15) for detecting natural gas components is installed on the other side of the top of the column box (1). Several air inlet detection ports (16) are provided at the bottom of the detector (15). The sample outlet pipe (33) is connected to the air inlet detection ports (16).

9. A method for full component analysis of natural gas, and a full component analysis apparatus for natural gas according to any one of claims 1-8, characterized in that, Includes the following steps: Step 1: First, the extracted natural gas is connected to the input end of the cyclone separator (51) through a pipeline. First, the particles are separated from the airflow by centrifugal force in the inner cavity of the cyclone separator (51). Then, the particles and residual droplets are further filtered through the filter element (53). At the same time, the blower (54) is started to increase the flow rate and flow of the gas through the filter element (53). The filtered sample gas enters the inner cavity of the sample inlet tube (31) from the main inlet pipe (55) through several branch pipes (56) connected at the bottom. Step 2: Carrier gas is supplied through the carrier gas cylinder (8), and the third gas control valve (10) controls the closing of the carrier gas cylinder (8). The carrier gas flows through the carrier gas outlet pipe (9) to the inner cavity of several connected carrier gas inlet pipes (6). The carrier gas flows from several carrier gas inlet pipes (6) to the corresponding connected branch inlet pipes (2), and together with the natural gas sample, it enters the liner (35) of the inner cavity of the sample injection tube (31) through the branch inlet pipe (2). Step 3: After filtration, the gas enters the main inlet pipe (55) from the clean gas outlet pipe (52), and then enters the inner cavity of the sample injection tube (31) through several branch pipes (56) connected at the bottom of the main inlet pipe (55). According to the detection requirements, the closing of the sample injection tube (31) is controlled by the first gas control valve (7), so that the natural gas sample can enter the chromatographic column body (32) through the sample injection tube (31) for separation processing. Step 4: The natural gas sample enters different chromatographic column bodies (32) through multiple inlet pipes (2) for separation, and the outlet pipe of each chromatographic column body (32) is connected to the corresponding inlet of the detector (15). Finally, the gas components separated in several sample outlet pipes (33) enter the detector (15) through the corresponding inlet detection inlet (16), and the natural gas complete component analysis results are obtained after sequential detection.

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