A mobile membrane nitrogen device suitable for ultra-low temperature and explosion-proof

Abstract

The utility model relates to nitrogen equipment technical field, specifically disclose a kind of movable membrane nitrogen generator suitable for ultralow temperature and explosion-proof, including container, container is provided with the gas-water separator, filter group that are sequentially connected in series communication, compressed gas input pipe outside intercommunication is provided with the membrane drying assembly parallel in valve body two ends, container is provided with explosion-proof control cabinet and explosion-proof switch board, and explosion-proof control cabinet is provided with PLC controller inside.The device of the present application utilizes pipeline heater to heat compressed gas, ensure smooth start operation in low-temperature cold environment, nitrogen equipment is concentrated in container, compared with nitrogen equipment installation in workshop, container realizes the convenient movement of equipment;Shutdown purging device is designed, compressed air passes through special membrane drying assembly, obtains dry clean compressed air, uses the clean compressed air, purges inside system, and condensate is discharged, to improve the service life of equipment.

Description

Technical Field

[0001] This utility model relates to the field of nitrogen generation equipment technology, specifically to a portable membrane nitrogen generation device suitable for ultra-low temperatures and explosion-proof. Background Technology

[0002] Some extremely cold regions are rich in oil and natural gas resources. With the continuous progress of science and technology and society, the demand for oil and natural gas is increasing day by day. Efficient and high-productivity extraction of these resources has become a goal. Among the technologies developed is the injection of high-purity nitrogen into oil reservoirs to enhance oil recovery. However, problems such as extremely cold regions (extreme low temperatures of -50℃), flammable and explosive working environments, and high required nitrogen pressures urgently need to be solved. To meet the needs of use in extremely cold and flammable / explosive regions, and to satisfy high-pressure requirements, improvements are necessary. Therefore, we propose a portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof design. Utility Model Content

[0003] In view of the above-mentioned technical problems in related technologies, this utility model provides a portable membrane nitrogen generator that is suitable for ultra-low temperature and explosion-proof, which can solve the above problems.

[0004] To achieve the above-mentioned technical objectives, the technical solution of this utility model is implemented as follows: A portable membrane nitrogen generator suitable for cryogenic and explosion-proof applications includes a container. Inside the container are a gas-liquid separator, filter group A, filter group B, a pipeline heater, filter group C, filter group D, and filter group E, connected in series. The output end of filter group E is connected to the membrane group via pipe A, and the output end of the membrane group is connected to a flow meter pipeline via pipe B. The input end of the gas-liquid separator is connected to a compressed gas input pipe, and a valve body is connected in series in the middle of the compressed gas input pipe. A membrane drying assembly connected in parallel to both ends of the valve body is connected to the outside of the compressed gas input pipe. An explosion-proof control cabinet and an explosion-proof power distribution cabinet are installed inside the container, and a PLC controller is installed inside the explosion-proof control cabinet.

[0005] Furthermore, a temperature sensor and a pneumatic valve A are connected in series in pipe A, and a branch pipe A is connected to the outside of pipe A. A pneumatic valve B is connected in series in branch pipe A. The PLC controller is electrically connected to the temperature sensor, pneumatic valve A, and pneumatic valve B respectively.

[0006] Furthermore, a nitrogen flow meter is installed in connection with pipe B, and a flow regulating valve is connected in series in the flow meter pipeline. A branch pipe B is also installed in connection with pipe B, and a pneumatic valve C is connected in series in branch pipe B. A nitrogen purity detector is installed inside the explosion-proof control cabinet. The detection end of the nitrogen purity detector is connected to pipe B through a gas pipe. The PLC controller is electrically connected to the nitrogen purity detector, the flow regulating valve, and the pneumatic valve C respectively.

[0007] Furthermore, the membrane drying assembly includes a micro gas-liquid separator, several micro filter cartridges, and a membrane dryer connected in series.

[0008] Furthermore, the gas-water separator is a cyclone gas-water separator, filter groups A, B, D and E are cartridge filters, and filter group C is an activated carbon filter.

[0009] Furthermore, an ambient heater is installed inside the container, which includes a resistance heater and a fan.

[0010] Furthermore, the container walls are equipped with cavities, which are filled with insulation layers.

[0011] The beneficial effects of this utility model are as follows: The device of this application uses a pipeline heater to heat the compressed gas, and works with an ambient heater to raise the temperature of the equipment environment inside the container, ensuring smooth start-up and operation in low-temperature and cold environments. The nitrogen generation equipment is concentrated inside the container. Compared with nitrogen generation equipment installed in the factory building, the container enables convenient movement of the equipment. A shutdown purging device was designed. Compressed air passes through a special membrane drying component to obtain dry and clean compressed air. This clean compressed air is used to purge the inside of the system and discharge condensate, thereby improving the service life of the equipment. The pipeline is designed with a temperature sensor to promptly remove excessively hot gas, preventing damage to the subsequent membrane module. A nitrogen purity detector is installed in conjunction with a branch pipe to remove gas with nitrogen concentrations that do not meet the standards, ensuring the stability of the nitrogen content used by the customer. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the embodiments 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 these drawings without creative effort.

[0013] The present invention will now be described in further detail with reference to the accompanying drawings.

[0014] Figure 1 This is a view of the portable membrane nitrogen generator AA; Figure 2 This is a view of the portable membrane nitrogen generator BB; Figure 3 This is a schematic diagram of a portable membrane nitrogen generator.

[0015] In the picture: 1-1. Gas-water separator; 1-2. Filter group A; 1-3. Filter group B; 1-4. Filter group C; 1-5. Filter group D; 1-6. Filter group E; 2. Pipe heater; 3. Ambient heater; 4. Membrane module; 5. Flow meter pipeline; 6. Membrane drying assembly; 7. Explosion-proof control cabinet; 8. Explosion-proof power distribution cabinet; 9. Container; 10. Purge pipe; 11. Manual valve; 12. Valve body; 13. Temperature sensor; 14. Branch pipe A; 15. Pneumatic valve B; 16. Pneumatic valve A; 17. Branch pipe B; 18. Nitrogen flow meter; 19. Pneumatic valve C. Detailed Implementation

[0016] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model are within the protection scope of the present utility model.

[0017] like Figure 1-3 As shown, this utility model discloses a portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, comprising a container 9. Inside the container 9 are a gas-liquid separator 1-1, filter group A1-2, filter group B1-3, pipe heater 2, filter group C1-4, filter group D1-5, and filter group E1-6 connected in series. The output end of filter group E1-6 is connected to membrane group 4 via pipe A, and the output end of membrane group 4 is connected to flow meter pipeline 5 via pipe B. The gas-liquid separator 1-1 input... The container 9 is connected to a compressed air input pipe, and a valve body 12 is connected in series in the middle of the compressed air input pipe. A membrane drying assembly 6 is connected to both ends of the valve body 12 in parallel outside the compressed air input pipe. An explosion-proof control cabinet 7 and an explosion-proof power distribution cabinet 8 are installed inside the container 9 (the explosion-proof control cabinet 7 and the explosion-proof power distribution cabinet 8 are made of high-strength, impact-resistant explosion-proof materials, such as cast aluminum alloy and stainless steel. The structural design of the shell can isolate the potential fire source inside from the flammable and explosive gases or dust outside). A PLC controller is installed inside the explosion-proof control cabinet 7. Pipe A is connected in series with temperature sensor 13 and pneumatic valve A16. Pipe A is externally connected to branch pipe A14, which is connected in series with pneumatic valve B15. The PLC controller is electrically connected to temperature sensor 13, pneumatic valve A16, and pneumatic valve B15. Pipe B is connected to nitrogen flow meter 18, which is connected in series with flow regulating valve 5. Pipe B is also connected to branch pipe B17, which is connected in series with pneumatic valve C. An explosion-proof control cabinet 7 contains a nitrogen purity detector. The detection end of the nitrogen purity detector is connected to pipe B via a gas pipe. The detection end of the nitrogen purity detector is located at the front end of branch pipe B17 and flow meter line 5, and is used to detect the concentration of nitrogen separated from membrane module 4. The PLC controller is electrically connected to the nitrogen purity detector, flow regulating valve, and pneumatic valve C19.

[0018] Example 1: As Figure 1 As shown, compressed gas enters from the main pipeline, passes through valve body 12, and then enters the gas-water separator 1-1 for cyclone separation. The cyclone separator causes water to be centrifugally thrown against the inner wall of the gas-water separator 1-1. The compressed gas then enters filter group A1-2 (filter groups A1-2, B1-3, D1-5, and E1-6 all use built-in filter cartridges, utilizing the micropores of the filter cartridges to filter gas impurities). The pipeline heater 2 has a built-in heating resistor to heat the compressed gas. Filter group C1-4 is filled with activated carbon for further... The gas adsorbs impurities and purifies the odor. After purification, the gas enters pipe A. Temperature sensor 13 detects the temperature of the compressed gas. When the set temperature is not higher than 50℃, pneumatic valve A16 is opened and pneumatic valve B15 is closed, and the compressed gas enters membrane module 4 for nitrogen separation. When the temperature is higher than 50℃, pneumatic valve A16 is closed and pneumatic valve B15 is opened (the switching between pneumatic valve A16 and pneumatic valve B15 is controlled by the PLC controller inside the explosion-proof control cabinet 7). The high-temperature compressed gas will be discharged to the atmosphere from branch pipe A14 to avoid entering membrane module 4 and causing damage. The principle of nitrogen separation technology using membrane module 4 is based on the use of high-molecular hollow fiber membranes or flat sheet membranes. Membrane materials have different permeation rates for different gas molecules. Small molecules such as oxygen, carbon dioxide, and water vapor diffuse faster in the membrane, while nitrogen molecules are larger and diffuse more slowly. When compressed air enters the membrane module, a pressure difference (typically 0.5-1.0 MPa) is created across the membrane, propelling gas molecules from the high-pressure side to the low-pressure side. Small molecules such as oxygen and carbon dioxide preferentially pass through the membrane wall and are discharged from the low-pressure side, forming oxygen-rich waste gas. Nitrogen molecules, due to their slower diffusion rate, are retained on the high-pressure side of the membrane, forming nitrogen-rich gas with a purity of 95%-99.9%. The membrane module consists of thousands of hollow fiber membrane filaments, typically with an outer diameter of 0.2-1.0 mm. The inner wall has a porous structure, while the outer wall is a dense separation layer. The nitrogen gas at the separation point flows through pipe B to the flow meter pipe 5. The nitrogen purity detector is connected to pipe B via a gas tube and is used to detect the purity of nitrogen exiting membrane module 4. The nitrogen detection sensor in the detector is an electrochemical sensor, based on the redox reaction of gas on the electrode surface, measuring the concentration of a specific gas through changes in current or potential. Sensor structure: It includes a working electrode, a counter electrode, and a reference electrode, and is typically used to detect oxygen concentration. Reaction process: Oxygen undergoes a reduction reaction on the working electrode, generating a current proportional to its concentration. Purity Calculation: The oxygen content is calculated by measuring the current value, and then the nitrogen purity is estimated (nitrogen purity = 100% - oxygen content). The nitrogen purity detector sensor, flow regulating valve, and pneumatic valve C on branch pipe B17 are electrically connected to the PLC controller. When the detected nitrogen concentration is above 96%, the flow regulating valve is turned on and the pneumatic valve C19 is closed, and qualified nitrogen is output from the flow meter pipeline 5. When the nitrogen concentration detected by the nitrogen purity detector sensor is below 96%, the flow regulating valve is closed and the pneumatic valve C is turned on to discharge the gas with insufficient purity, ensuring the nitrogen purity value (the switching between pneumatic valve C and flow regulating valve is controlled by the PLC controller inside the explosion-proof control cabinet 7).

[0019] In the preferred technical solution, the membrane drying assembly 6 includes a micro gas-water separator, several micro filter cartridges, and a membrane dryer connected in series. The micro gas-water separator is a small cyclone separator, and the micro filter cartridges are small cartridge filters with built-in microporous filter cartridges for adsorbing and filtering gas impurities. The membrane dryer uses a high molecular polymer membrane (such as polyimide, cellulose acetate, etc.). These membranes have high permeability to water vapor but extremely low permeability to other gases (such as nitrogen, oxygen, carbon dioxide, etc.). The principle of the membrane dryer in separating gas moisture is based on the difference in permeation rate of water vapor and other gases by selective permeation membranes. Water vapor is preferentially driven to permeate through the membrane by the pressure difference or concentration difference on both sides of the membrane, thereby achieving gas drying.

[0020] In the preferred technical solution, the gas-water separator 1-1 is a cyclone gas-water separator, filter groups A1-2, B1-3, D1-5, and E1-6 are cartridge filters, and filter group C1-4 is an activated carbon filter. The gas-water separator 1-1 uses a cyclone separator, which causes water to be centrifugally thrown against the inner wall of the gas-water separator 1-1, and the compressed gas is separated and enters filter group A1-2 (filter groups A1-2, B1-3, D1-5, and E1-6 all use built-in cartridge filtration, which uses the micropores of the cartridge to filter gas impurities). The pipeline heater 2 has a built-in heating resistor to heat the compressed gas. The filter group C1-4 is filled with activated carbon to further adsorb gas impurities and purify odors.

[0021] In the preferred technical solution, an ambient heater 3 is installed inside the container 9. The ambient heater 3 includes a resistance heater and a fan. The resistance heater generates heat, and the fan accelerates the gas flow, so that the container 9 is filled with hot air and heated.

[0022] In the preferred technical solution, the container wall of container 9 is provided with a cavity, which is filled with an insulation layer to minimize heat loss.

[0023] In practical use, valve body 12 is open and manual valve 11 is closed. Compressed gas passes through gas-water separator 1-1, filter group A1-2, filter group B1-3, pipeline heater 2, filter group C1-4, filter group D1-5, filter group E1-6, and membrane group 4 to generate nitrogen. When the system is shut down, valve body 12 is closed and manual valve 11 is open. Compressed gas passes through membrane drying assembly 6 for moisture separation. The dried compressed gas is then introduced into the nitrogen generation pipeline. The airflow carries away the residual condensate in gas-water separator 1-1, filter group A1-2, filter group B1-3, pipeline heater 2, filter group C1-4, filter group D1-5, filter group E1-6, and membrane group 4 and discharges it from the nitrogen generation system (during shutdown purging, the flow regulating valve is closed and the pneumatic valve C is open to discharge the gas).

[0024] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, characterized in that, The container (9) contains a gas-water separator (1-1), filter group A (1-2), filter group B (1-3), pipe heater (2), filter group C (1-4), filter group D (1-5) and filter group E (1-6) connected in series. The output end of filter group E (1-6) is connected to membrane group (4) through pipe A. The output end of membrane group (4) is connected to flow meter pipeline (5) through pipe B. The input end of gas-water separator (1-1) is connected to compressed air input pipe. A valve body (12) is connected in series in the middle of the compressed air input pipe. A membrane drying assembly (6) is connected to both ends of valve body (12) outside the compressed air input pipe. An explosion-proof control cabinet (7) and an explosion-proof power distribution cabinet (8) are installed inside the container (9). A PLC controller is installed inside the explosion-proof control cabinet (7).

2. A portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, as described in claim 1, characterized in that, The pipe A is connected in series with a temperature sensor (13) and a pneumatic valve A (16). The pipe A is connected to a branch pipe A (14). The branch pipe A (14) is connected in series with a pneumatic valve B (15). The PLC controller is electrically connected to the temperature sensor (13), the pneumatic valve A (16), and the pneumatic valve B (15) respectively.

3. A portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, as described in claim 1, characterized in that, The pipeline B is connected to a nitrogen flow meter (18), the flow meter pipeline (5) is connected in series with a flow regulating valve, the pipeline B is connected to a branch pipe B (17), the branch pipe B (17) is connected in series with a pneumatic valve C, the explosion-proof control cabinet (7) is equipped with a nitrogen purity detector, the detection end of the nitrogen purity detector is connected to the pipeline B through a gas pipe, and the PLC controller is electrically connected to the nitrogen purity detector, the flow regulating valve, and the pneumatic valve C (19) respectively.

4. A portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, as described in claim 1, characterized in that, The membrane drying assembly (6) includes a micro gas-water separator, several micro filter cartridges and a membrane dryer connected in series.

5. A portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, as described in claim 1, characterized in that, The gas-water separator (1-1) is a cyclone gas-water separator, the filter group A (1-2), filter group B (1-3), filter group D (1-5) and filter group E (1-6) are cartridge filters, and the filter group C (1-4) is an activated carbon filter.

6. A portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, as described in claim 1, characterized in that, An ambient heater (3) is installed inside the container (9), the ambient heater (3) including a resistance heater and a fan.

7. A portable membrane nitrogen generator suitable for ultra-low temperatures and explosion-proof, as described in claim 1, characterized in that, The container (9) has a cavity in its body wall, and the cavity is filled with an insulation layer.

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