Natural gas sampling and pretreatment device

Abstract

The invention relates to a natural gas sampling and pretreatment device, and belongs to the technical field of sampling devices. A sampling probe is connected with one end of a filter through a pipeline, and the other end of the filter is communicated with a water storage chamber through a pipeline; the other end of the water storage chamber is sequentially communicated with the dehumidification chamber and the desulfurization chamber; a dehumidification filter material and a desulfurization filter material are respectively arranged in the dehumidification chamber and the desulfurization chamber; screens are arranged at the inlet end and the outlet end of the dehumidification chamber. The other end of the desulfurization chamber is communicated with the sampling bottle, and the heating mechanism is used for heating the sampling bottle and controlling the temperature in the sampling bottle; and the sampling box is densely filled with glass wool. By arranging the dehumidification chamber and the desulfurization chamber, adsorption of natural gas components is avoided, and meanwhile hydrogen sulfide in natural gas can be adsorbed. The sampling bottle can be heated by winding the anti-explosion flame-retardant self-temperature-control heating tape outside the sampling bottle, so that the temperature of a sample is higher than a hydrocarbon dew point and a water dew point at any time, and natural gas condensation is prevented.

Description

Technical Field

[0001] The invention relates to a natural gas sampling and pretreatment device, belonging to the technical field of sampling devices. Background Art

[0002] Natural gas testing is a crucial foundation for natural gas development and production, pipeline transportation, transfer measurement, and quality control. It also provides crucial data for energy conservation monitoring and carbon accounting. The accuracy and timeliness of natural gas testing data significantly impact subsequent work. When collecting natural gas for composition analysis, trace amounts of dust, mist, and moisture are carried along with the natural gas after separation at the mine and purification at the processing plant. If not properly processed, these dust and mist can contaminate the sensors, optical components, and chromatographic columns of online analyzers, causing measurement errors or operational failures. Therefore, natural gas samples must undergo meticulous pretreatment to remove these impurities before being sent to the analyzer for analysis.

[0003] If the sampling device is not in compliance with regulations during the natural gas sampling process, air will be mixed in the sampling process, and gas leakage may also occur, resulting in detection errors, safety hazards and environmental pollution. Summary of the Invention

[0004] To address these issues, the present invention proposes a natural gas sampling and pretreatment device that can perform standardized sampling and pretreatment of natural gas sources for natural gas composition analysis. This device removes impurities that could affect natural gas composition analysis, meeting the requirements for natural gas composition testing. This device improves the accuracy and safety of natural gas analysis, providing a foundation for obtaining representative samples and accurate natural gas composition analysis data. Furthermore, the device is simple to operate, safe, and environmentally friendly.

[0005] To achieve the above-mentioned purpose, the technical solution of the present application is a natural gas sampling and pretreatment device, including a sampling probe, a filter, and a water storage chamber, a dehumidification chamber, a desulfurization chamber, a sampling bottle and a heating mechanism installed in a sampling box; the sampling probe is connected to one end of the filter through a pipeline, and the other end of the filter is connected to the water storage chamber through a pipeline; the other end of the water storage chamber is connected to the dehumidification chamber and the desulfurization chamber in turn; the dehumidification chamber and the desulfurization chamber are respectively equipped with dehumidification filter material and desulfurization filter material; the inlet and outlet ends of the dehumidification chamber are both provided with screens; the other end of the desulfurization chamber is connected to the sampling bottle, and the heating mechanism is used to control the temperature in the sampling bottle; the interior of the sampling box is densely filled with glass wool.

[0006] The filter is equipped with an acetate fiber filter membrane for filtering out condensate, amine, ethylene glycol, oil, particles and other liquids or particulates in the natural gas.

[0007] Furthermore, the dehumidification filter material is modified pumice impregnated with calcium chloride; the desulfurization filter material is modified pumice impregnated with copper sulfate.

[0008] Furthermore, the pore size of the cellulose acetate filter membrane is 0.45 microns.

[0009] Furthermore, the filter, water storage chamber, dehumidification chamber, desulfurization chamber and sampling bottle are all made of polytetrafluoroethylene.

[0010] Furthermore, the heating mechanism includes an explosion-proof, flame-retardant, self-controlled temperature heating belt and a voltage-stabilized power supply box. The explosion-proof, flame-retardant, self-controlled temperature heating belt is wrapped around the outer wall of the sampling bottle. The explosion-proof, flame-retardant, self-controlled temperature heating belt is temperature-controlled by a temperature control sensor. The voltage-stabilized power supply box provides power. The voltage-stabilized power supply box is also provided with a charging port, which can be charged in real time.

[0011] Furthermore, the mesh size of the sieve is 60 meshes.

[0012] Furthermore, a stop valve A and a pressure gauge A are provided on the pipeline between the sampling probe and the filter to control the pressure in the pipeline.

[0013] Furthermore, a stop valve B is installed on the outlet pipeline of the desulfurization chamber.

[0014] Furthermore, an air inlet stop valve and a pressure gauge B are provided on the air inlet pipeline of the sampling bottle; an air outlet stop valve is provided on the air outlet pipeline, and the stop valve B is installed upstream of the air inlet stop valve.

[0015] Furthermore, a water outlet pipe is provided at the bottom of the water storage chamber, and the sampling box is provided with a drain port, and the water outlet pipe is connected to the drain port.

[0016] The present invention adopts the above technical solution to achieve the following technical effects:

[0017] 1. The sampling bottle is made of polytetrafluoroethylene to avoid the adsorption of natural gas components by the sampling material;

[0018] 2. The present invention uses pumice and calcium chloride as dehumidifying materials, and modified pumice impregnated with copper sulfate as a desulfurizing material to filter natural gas, avoiding adsorption of natural gas components while simultaneously absorbing hydrogen sulfide in the natural gas. Modified pumice impregnated with calcium chloride as a dehumidifying material to filter natural gas avoids adsorption of natural gas components while simultaneously absorbing moisture from the natural gas, significantly improving hygroscopicity and stability compared to using calcium chloride alone.

[0019] 3. The pore size of the cellulose acetate filter membrane is 0.45 microns. Volatile organic gases can pass through the filter membrane, but liquid droplets cannot pass through the holes due to their high surface tension, thereby effectively filtering condensates, amines, ethylene glycol, oils, particles and other liquids and particulate matter in natural gas.

[0020] 4. The explosion-proof, flame-retardant, self-controlling temperature heating tape wrapped around the sampling bottle can heat the sampling bottle so that the temperature of the sample is higher than the hydrocarbon dew point and water dew point at any time to prevent natural gas condensation.

[0021] 5. Filling the sampling box with glass wool and wrapping the sampling bottle with glass wool can effectively keep warm and prevent natural gas condensation. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a structural diagram of Example 1 of the present invention.

[0023] Explanation of the serial numbers in the figure: 1. Sampling probe; 2. Filter; 3. Water storage chamber; 4. Dehumidification chamber; 5. Desulfurization chamber; 6. Sampling bottle; 7. Stop valve A; 8. Pressure gauge A; 9. Dehumidification filter media; 10. Desulfurization filter media; 11. Screen; 12. Acetate fiber filter membrane; 13. Explosion-proof and flame-retardant self-controlling temperature heating belt; 14. Temperature control sensor; 15. Voltage-stabilized power supply box; 16. Charging port; 17. Stop valve B; 18. Air inlet stop valve; 19. Pressure gauge B; 20. Air outlet stop valve; 21. Water outlet pipe; 22. Sampling box. DETAILED DESCRIPTION

[0024] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. This application is further described using this as an example.

[0025] Example 1:

[0026] like Figure 1 As shown, this embodiment provides a natural gas sampling and pretreatment device, comprising a sampling probe 1, a filter 2, and a water storage chamber 3, a dehumidification chamber 4, a desulfurization chamber 5, a sampling bottle 6, and a heating mechanism installed within a sampling box 22. The sampling probe 1 is connected to one end of the filter 2 via a pipeline. A shutoff valve A7 and a pressure gauge A8 are provided in the pipeline between the sampling probe 1 and the filter 2 to control the pressure within the pipeline. The other end of the filter 2 is connected to the water storage chamber 3 via a pipeline. The other end of the water storage chamber 3 is connected to the dehumidification chamber 4 and the desulfurization chamber 5, respectively. The dehumidification chamber 4 and the desulfurization chamber 5 are each filled with a dehumidification filter material 9 and a desulfurization filter material 10. The inlet and outlet of the dehumidification chamber 4 are both equipped with a screen 11. The other end of the desulfurization chamber 5 is connected to the sampling bottle 6. The heating mechanism heats the sampling bottle 6 to control the temperature within the sampling bottle 6, keeping it above the hydrocarbon dew point and water dew point to prevent natural gas condensation. The interior of the sampling box 22 is densely packed with glass wool.

[0027] The filter 2 is provided with an acetate filter membrane 12 for filtering out condensate, amine, ethylene glycol, oil, particles and other liquids or particulates in the natural gas.

[0028] The dehumidification filter material 9 is modified pumice impregnated with calcium chloride; the desulfurization filter material 10 is modified pumice impregnated with copper sulfate.

[0029] The pore size of the cellulose acetate filter membrane 12 is 0.45 microns.

[0030] The filter 2, water storage chamber 3, dehumidification chamber 4, desulfurization chamber 5 and sampling bottle 6 are all made of polytetrafluoroethylene.

[0031] The heating mechanism includes an explosion-proof, flame-retardant, self-temperature-controlled heating belt 13 and a voltage-stabilized power supply box 15. The explosion-proof, flame-retardant, self-temperature-controlled heating belt 13 is wrapped around the outer wall of the sampling bottle 6. The explosion-proof, flame-retardant, self-temperature-controlled heating belt 13 controls the temperature by sensing the measured temperature in real time through the temperature control sensor 14. The voltage-stabilized power supply box 15 provides power. The voltage-stabilized power supply box 15 is also provided with a charging port 16, which can be charged in real time.

[0032] The mesh number of the sieve is 60 meshes.

[0033] A stop valve B17 is installed on the outlet pipeline of the desulfurization chamber 5.

[0034] The sampling bottle 6 is provided with an air inlet stop valve 18 and a pressure gauge B19 on the air inlet end pipeline; an air outlet stop valve 20 is provided on the air outlet end pipeline, and a stop valve B17 is installed upstream of the air inlet stop valve 18.

[0035] A water outlet pipe 21 is provided at the bottom of the water storage chamber 3 , and a drainage port is provided in the sampling box 22 . The water outlet pipe 21 is connected to the drainage port, so as to drain the water in the water storage chamber 3 .

[0036] Natural gas to be tested enters the device through sampling probe 1. Shutoff valve A7 regulates the natural gas pressure to 1 MPa, ensuring a constant pressure through cellulose acetate filter 12. This pressure is not affected by desulfurization chamber 5, and the natural gas enters filter 2 to remove mechanical impurities, oil droplets, and particulate matter. The natural gas then settles naturally through water storage chamber 3, and passes through dehumidification chamber 4 to remove hydrogen sulfide and moisture. Pressure gauge B19 maintains a pressure of 0.5 MPa to prevent overpressure through sampling bottle 6. Natural gas then enters sampling bottle 6, where it is collected for testing. This ensures representative natural gas collection and pre-processes the sample for component analysis.

[0037] The sampling bottle 6 of the present invention is made of polytetrafluoroethylene to avoid the adsorption of natural gas components by the sampling material. The dehumidification material of the present invention is selected from pumice and calcium chloride, and the desulfurization material is selected from modified pumice impregnated with copper sulfate to filter natural gas, thereby avoiding the adsorption of natural gas components and being able to adsorb hydrogen sulfide in natural gas. The dehumidification material is selected from modified pumice impregnated with calcium chloride to filter natural gas, thereby avoiding the adsorption of natural gas components and being able to absorb moisture in natural gas, thereby improving hygroscopicity and stability better than using calcium chloride alone. The pore size of the cellulose acetate filter membrane 12 is 0.45 microns, and volatile organic gases can pass through the filter membrane. Liquid droplets cannot pass through the cavities due to excessive surface tension, thereby effectively filtering condensates, amines, ethylene glycol, oils, microparticles and other liquids and particulates in natural gas. The sampling bottle 6 is wrapped with an explosion-proof, flame-retardant, self-controlled temperature heating belt 13 to heat the sampling bottle 6, so that the temperature of the sample is always higher than the hydrocarbon dew point and water dew point to prevent natural gas condensation. The sampling box 22 is filled with glass wool, and the sampling bottle 6 is wrapped with glass wool to effectively keep warm and prevent natural gas condensation.

[0038] The desulfurization filter material 10 is made from pumice, which is crushed, ball-milled, and sieved into particles of the desired size (8-16 mesh). The particles are then oven-dried at 105°C for 5 hours, calcined in a muffle furnace at 1000°C for 2 hours, quenched in tap water for 20 minutes, drained, and oven-dried at 105°C for 10 hours. The treated pumice is then immersed in a saturated copper sulfate solution, boiled for 3 hours, and then immersed for 48 hours. The modified pumice is removed, washed with deionized water to remove the copper sulfate from the surface, and then placed in an enameled dish. The dish is then placed in a drying oven and dried at 160°C until it turns white. The dish is then stored in the drying oven and allowed to cool to room temperature.

[0039] The dehumidifying filter material 9 is made of pumice, which is crushed, ball-milled, and sieved into particles of the desired size of 8-16 mesh. The particles are then dried in an oven at 105°C for 5 hours, calcined in a muffle furnace at 1000°C for 2 hours, quenched in tap water for 20 minutes, drained, and oven-dried at 105°C for 10 hours. The treated pumice is immersed in a saturated calcium chloride solution, boiled for 2 hours, and then immersed for 48 hours. The modified pumice is removed and washed with deionized water to remove the surface calcium chloride. The pumice is then placed in an enamel tray, which is then placed in a drying oven and dried at 180°C until the weight no longer decreases. The pumice is then stored in the drying oven and allowed to cool to room temperature.

[0040] The above description is only a preferred specific implementation method of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, can make equivalent replacements or changes based on the technical solutions and inventive concepts of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A natural gas sampling and pretreatment device, characterized in that: The invention comprises a sampling probe (1), a filter (2), a water storage chamber (3), a dehumidification chamber (4), a desulfurization chamber (5), a sampling bottle (6) and a heating mechanism installed in a sampling box (22); the sampling probe (1) is connected to one end of the filter (2) through a pipeline, and the other end of the filter (2) is connected to the water storage chamber (3) through a pipeline; the other end of the water storage chamber (3) is connected to the dehumidification chamber (4) and the desulfurization chamber (5) in sequence; the dehumidification chamber (4) and the desulfurization chamber (5) are respectively provided with dehumidification filter material (9) and desulfurization filter material (10); the inlet and outlet ends of the dehumidification chamber (4) are both provided with screens (11); the other end of the desulfurization chamber (5) is connected to the sampling bottle (6), and the heating mechanism is used to control the temperature in the sampling bottle (6).

2. A natural gas sampling and pretreatment device according to claim 1, characterized in that: A cellulose acetate filter membrane (12) is installed in the filter (2).

3. A natural gas sampling and pretreatment device according to claim 2, characterized in that: The pore size of the cellulose acetate filter membrane (12) is 0.45 microns.

4. A natural gas sampling and pretreatment device according to claim 1, characterized in that: The filter (2), the water storage chamber (3), the dehumidification chamber (4), the desulfurization chamber (5) and the sampling bottle (6) are all made of polytetrafluoroethylene.

5. A natural gas sampling and pretreatment device according to claim 1, characterized in that: The dehumidification filter material (9) is modified pumice impregnated with calcium chloride; the desulfurization filter material (10) is modified pumice impregnated with copper sulfate.

6. A natural gas sampling and pretreatment device according to claim 1, characterized in that: The heating mechanism comprises an explosion-proof, flame-retardant, self-controlled temperature heating belt (13) and a voltage-stabilized power supply box (15); the explosion-proof, flame-retardant, self-controlled temperature heating belt (13) is wound around the outer wall of the sampling bottle (6); the explosion-proof, flame-retardant, self-controlled temperature heating belt (13) is temperature-controlled by a temperature control sensor (14); the voltage-stabilized power supply box (15) provides power; and a charging port (16) is also provided on the voltage-stabilized power supply box (15).

7. A natural gas sampling and pretreatment device according to claim 1, characterized in that: A stop valve A (7) and a pressure gauge A (8) are also provided on the pipeline between the sampling probe (1) and the filter (2).

8. A natural gas sampling and pretreatment device according to claim 1, characterized in that: A water outlet pipe (21) is provided at the bottom of the water storage chamber (3), and a water outlet is provided in the sampling box (22), and the water outlet pipe (21) is communicated with the water outlet.

9. A natural gas sampling and pretreatment device according to claim 1, characterized in that: A stop valve B (17) is installed on the outlet pipeline of the desulfurization chamber (5), and an inlet stop valve (18) and a pressure gauge B (19) are installed on the inlet pipeline of the sampling bottle (6); an outlet stop valve (20) is installed on the outlet pipeline, and the stop valve B (17) is installed upstream of the inlet stop valve (18).

10. A natural gas sampling and pretreatment device according to any one of claims 1 to 9, characterized in that: The interior of the sampling box (22) is densely filled with glass wool.

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