Liquid methane flow monitoring control system

Abstract

The invention provides a liquid methane flow monitoring control system which comprises a methane tank, a backflow hand valve and a pipeline discharge valve are arranged at the top of the methane tank, the bottom of the methane tank is connected with a liquid outlet pipeline, and a liquid outlet valve is arranged on the liquid outlet pipeline; a pressure transmitter and a thermometer are mounted at the top of the methane tank, a flowmeter is arranged at the inlet section of the liquid outlet pipeline, and a first temperature sensor, a second temperature sensor, a first pressure sensor and a second pressure sensor are sequentially arranged on the liquid outlet pipeline; the first temperature sensor and the first pressure sensor are located at the front section of the liquid outlet pipeline, and the second temperature sensor and the second pressure sensor are located at the rear section of the liquid outlet pipeline; the tail end of the liquid outlet pipeline is connected with a discharge port, and an emergency cut-off valve is arranged at the front end of the discharge The emergency cut-off valve is electrically connected with the control unit; according to the system, a liquid methane treatment device integrating pressurization optimization, multi-dimensional state monitoring and intelligent safety control can be integrated, so that the overall operation efficiency and safety are improved.

Description

Technical Field

[0001] This invention relates to the field of dry chemical production, and more specifically, to a liquid methane flow monitoring and control system. Background Technology

[0002] Liquid methane, as a cryogenic fuel, requires specific devices for safe pressurization and controlled emissions during storage, transportation, and use. Traditional liquid methane processing units often face the following problems: First, the pressurization process relies on external power equipment, resulting in high energy consumption and insufficient response speed; second, the monitoring methods for flow conditions within pipelines are limited, making it difficult to capture local temperature or pressure anomalies in real time, which can easily lead to safety hazards; furthermore, emergency shut-off mechanisms mostly rely on manual intervention, which cannot respond quickly to emergencies, and the emission process lacks proactive adjustment of the pressure balance within the tank. Existing technologies suffer from complex device structures and low safety redundancy, making it difficult to meet the industrial demands for high efficiency, automation, and high reliability.

[0003] Therefore, there is an urgent need for a liquid methane treatment device that integrates pressurization optimization, multi-dimensional status monitoring, and intelligent safety control to improve overall operating efficiency and safety. Summary of the Invention

[0004] Design a liquid methane flow monitoring and control system to improve the overall operating efficiency and safety of the liquid methane treatment device, which can be optimized for pressurization, monitored for multi-dimensional conditions, and controlled intelligently.

[0005] This invention provides a liquid methane flow monitoring and control system, comprising a methane tank wherein: The top of the methane tank is equipped with a reflux manual valve and a pipeline discharge valve, and the bottom of the methane tank is connected to a liquid outlet pipeline, which is equipped with a liquid outlet valve. A pressure transmitter and a thermometer are installed on the top of the methane tank. A flow meter is installed at the inlet section of the liquid outlet pipe. A first temperature sensor, a second temperature sensor, a first pressure sensor, and a second pressure sensor are arranged sequentially in the liquid outlet pipe. The first temperature sensor and the first pressure sensor are located at the front section of the liquid outlet pipe, and the second temperature sensor and the second pressure sensor are located at the rear section of the liquid outlet pipe. The end of the liquid outlet pipe is connected to a discharge port, and an emergency shut-off valve is provided at the front end of the discharge port. The emergency shut-off valve is electrically connected to the control unit, which is also connected to the pressure transmitter, thermometer, flow meter, first temperature sensor, second temperature sensor, first pressure sensor, and second pressure sensor. The control unit is configured to trigger the emergency shut-off valve to close when any sensor data exceeds a preset threshold. The methane tank and the outlet pipe are connected by a flange seal. The diameter of the outlet pipe gradually decreases to form a pressurization section. The pipe wall of the pressurization section is provided with an annular guide groove, and shock-absorbing pads are embedded in the guide groove. The outlet pipe is wrapped with a heat insulation layer, and the space between the heat insulation layer and the pipe is filled with heat insulation material.

[0006] Preferably, the annular guide grooves are distributed at equal intervals along the axial direction of the pressurization section, and the distance between every two adjacent guide grooves is 1.2-1.5 times the pipe diameter.

[0007] Preferably, the control unit further includes a data storage module for recording real-time data from the pressure transmitter, thermometer, flow meter, first temperature sensor, second temperature sensor, first pressure sensor, and second pressure sensor.

[0008] Preferably, the emergency shut-off valve is a pneumatic shut-off valve, whose driving air source is connected to an external air pump through an independent pipeline, and a manual emergency switch is provided on the independent pipeline.

[0009] Preferably, a temperature alarm is provided on the outer surface of the insulation layer. The temperature alarm is connected to the control unit and triggers an alarm when the surface temperature of the insulation layer exceeds a set value.

[0010] Preferably, the bottom of the methane tank is provided with a support frame, and a shock-absorbing support is installed between the support frame and the ground, with a damping spring embedded in the shock-absorbing support.

[0011] Preferably, a pressure balancing valve is provided at the end of the pressurization section of the liquid outlet pipeline, and the pressure balancing valve is connected to the top of the methane tank through a branch pipe.

[0012] Preferably, a one-way valve is installed on the branch pipe, and the opening direction of the one-way valve is from the top of the methane tank to the pressure balancing valve.

[0013] Preferably, the top of the methane tank is also equipped with a safety relief valve, and the relief pressure value of the safety relief valve is higher than the preset threshold of the pressure transmitter.

[0014] Preferably, the control unit is also connected to a remote monitoring terminal, which is configured to display sensor data in real time and receive alarm signals sent by the control unit.

[0015] The beneficial effects of this invention are as follows: This invention provides a liquid methane flow monitoring and control system. This system achieves self-pressurization during liquid methane flow through a tapered pipe structure and a flow guide channel design, significantly reducing reliance on external power equipment and minimizing the impact of fluid oscillations on the pipeline. The distributed layout of multi-stage temperature and pressure sensors accurately captures dynamic changes in the pipeline, and combined with real-time data analysis from the control unit, forms a rapid identification and feedback mechanism for abnormal states. The dual protection of the emergency shut-off valve and safety relief valve ensures immediate interruption of discharge and pressure relief in cases of overpressure or overtemperature, preventing system collapse. Furthermore, the design of the insulation layer and anti-vibration supports effectively reduces environmental heat conduction and mechanical vibration interference, and, combined with real-time data synchronization from the remote monitoring terminal, further improves operational convenience and system stability. The overall solution simplifies the structure while achieving an organic unity of efficient pressurization, accurate monitoring, and intelligent safety control. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a liquid methane flow monitoring and control system according to the present invention; Figure 2 This is a partial enlargement of a liquid methane flow monitoring and control system according to the present invention. Figure 1 ; Figure 3 This is a partial enlargement of the liquid methane flow monitoring and control system of the present invention. Figure 2 ; Figure 4 This is a partial enlargement of the liquid methane flow monitoring and control system of the present invention. Figure 3 ; Figure 5 This is a partial enlargement of a liquid methane flow monitoring and control system according to the present invention. Figure 5 .

[0017] In the diagram: 1. Methane tank; 2. Return valve; 3. Pipeline discharge valve; 4. Discharge pipeline; 5. Discharge valve; 6. Pressure transmitter; 7. Thermometer; 8. Flow meter; 9. First temperature sensor; 10. Second temperature sensor; 11. First pressure sensor; 12. Second pressure sensor; 13. Discharge port; 14. Emergency shut-off valve; 15. Control unit; 16. Pressurization section; 17. Annular guide channel; 18. Vibration damping pad; 19. Insulation layer; 20. Thermal insulation material; 21. Data storage module; 22. Independent pipeline; 23. Manual emergency switch; 24. Temperature alarm; 25. Support frame; 26. Anti-vibration support; 27. Damping spring; 28. Pressure balancing valve; 29. ​​Branch pipe; 30. Check valve; 31. Safety relief valve; 32. Remote monitoring terminal. Detailed Implementation

[0018] To make the technical solution of the present invention easier to understand, the technical solution of the present invention will now be clearly and completely described in conjunction with the accompanying drawings and specific embodiments.

[0019] Example 1: like Figure 1-5 As shown, this embodiment of a liquid methane flow monitoring and control system includes a methane tank 1, wherein: The top of the methane tank 1 is equipped with a reflux hand valve 2 and a pipeline discharge valve 3, and the bottom of the methane tank 1 is connected to a liquid outlet pipe 4, which is equipped with a liquid outlet valve 5. A pressure transmitter 6 and a thermometer 7 are installed on the top of the methane tank 1. A flow meter 8 is installed at the inlet section of the liquid outlet pipe 4. A first temperature sensor 9, a second temperature sensor 10, a first pressure sensor 11, and a second pressure sensor 12 are arranged sequentially on the liquid outlet pipe 4. The first temperature sensor 9 and the first pressure sensor 11 are located at the front section of the liquid outlet pipe 4, and the second temperature sensor 10 and the second pressure sensor 12 are located at the rear section of the liquid outlet pipe 4. The end of the liquid outlet pipe 4 is connected to the discharge port 13, and an emergency shut-off valve 14 is provided at the front end of the discharge port 13. The emergency shut-off valve 14 is electrically connected to the control unit 15, and the control unit 15 is simultaneously connected to the pressure transmitter 6, thermometer 7, flow meter 8, first temperature sensor 9, second temperature sensor 10, first pressure sensor 11, and second pressure sensor 12. The control unit 15 is configured to trigger the emergency shut-off valve 14 to close when any sensor data exceeds a preset threshold. The methane tank 1 and the liquid outlet pipe 4 are connected by a flange seal. The diameter of the liquid outlet pipe 4 gradually decreases to form a pressurization section 16. The wall of the pressurization section 16 is provided with an annular guide groove 17, and the guide groove 17 is embedded with a shock-absorbing pad 18. The outside of the liquid outlet pipe 4 is wrapped with a heat insulation layer 19, and the space between the heat insulation layer 19 and the pipe is filled with heat insulation material 20.

[0020] The annular guide grooves 17 are distributed at equal intervals along the axial direction of the pressurization section 16, and the distance between every two adjacent guide grooves 17 is 1.2-1.5 times the pipe diameter.

[0021] The control unit 15 also includes a data storage module 21 for recording real-time data from the pressure transmitter 6, thermometer 7, flow meter 8, first temperature sensor 9, second temperature sensor 10, first pressure sensor 11, and second pressure sensor 12.

[0022] The emergency shut-off valve 14 is a pneumatic shut-off valve, and its driving air source is connected to an external air pump through an independent pipeline 22. A manual emergency switch 23 is provided on the independent pipeline 22.

[0023] A temperature alarm 24 is provided on the outer surface of the insulation layer 19. The temperature alarm 24 is connected to the control unit 15. When the temperature of the insulation layer surface exceeds the set value, the alarm is triggered.

[0024] The bottom of the methane tank 1 is provided with a support frame 25, and a shock-absorbing support 26 is installed between the support frame 25 and the ground. The shock-absorbing support 26 is embedded with a damping spring 27.

[0025] The pressure boosting section 16 of the liquid outlet pipe 4 is equipped with a pressure balancing valve 28, which is connected to the top of the methane tank 1 through a branch pipe 29.

[0026] A one-way valve 30 is installed on the branch pipe 29. The opening direction of the one-way valve 30 is from the top of the methane tank 1 to the pressure balance valve 28.

[0027] The top of the methane tank 1 is also equipped with a safety relief valve 31, and the relief pressure value of the safety relief valve 31 is higher than the preset threshold of the pressure transmitter 6.

[0028] The control unit 15 is also connected to a remote monitoring terminal 32, which is configured to display sensor data in real time and receive alarm signals sent by the control unit 15.

[0029] Example 2 Unlike Example 1, such as Figure 1-5 As shown, this embodiment provides a liquid methane flow monitoring and control system: When the device is started, the operator closes the reflux valve 2 at the top of the methane tank 1 and the pipeline discharge valve 3, and then opens the bottom liquid outlet valve 5. Liquid methane flows into the pressurization section 16 through the liquid outlet pipe 4. The diameter of the pressurization section 16 gradually decreases, and with the optimized flow channel of the annular guide channel 17, the liquid methane pressure continuously increases. The flow meter 8 monitors the flow data in real time, and the first temperature sensor 9, the second temperature sensor 10, the first pressure sensor 11, and the second pressure sensor 12 collect the temperature and pressure information of the front and rear sections of the pipeline, respectively. The control unit 15 receives the above data and compares it with the preset threshold. If it does not exceed the safety range, the liquid methane is sprayed out normally through the discharge port 13. The data storage module 21 records the parameters of the entire process and displays the real-time status through the remote monitoring terminal 32.

[0030] During liquid methane discharge, if the second pressure sensor 12 detects a sudden increase in pressure at the downstream end of the pipeline, the control unit 15 determines it to be an abnormal state and immediately sends a closing command to the emergency shut-off valve 14, blocking the flow of liquid methane to the discharge port 13. Simultaneously, the pressure balancing valve 28 connects to the top of the methane tank 1 via the branch pipe 29, releasing some pressure into the tank to prevent pipeline overload. If the temperature alarm 24 on the outer surface of the insulation layer 19 detects an abnormal temperature increase, the control unit 15 simultaneously triggers an audible and visual alarm and sends a warning signal through the remote monitoring terminal 32. Operators can manually shut off the gas supply to the independent pipeline 22 via the emergency switch 23, ensuring that the emergency shut-off valve 14 is locked. After the fault is cleared, the device is restarted, and the cause of the anomaly is analyzed based on the historical records in the data storage module 21 to optimize subsequent operating parameters.

[0031] It should be noted that the embodiments described herein are only some embodiments of the present invention, and not all implementations of the present invention. These embodiments are merely illustrative and are intended only to provide a more intuitive and clear way to understand the content of the present invention, not to limit the technical solutions described herein. All other implementation methods that can be conceived by those skilled in the art without creative effort, as well as other simple substitutions and variations of the technical solutions of the present invention, without departing from the concept of the present invention, are within the protection scope of the present invention.

Claims

1. A liquid methane pressurization and emission device, characterized in that, Includes a methane tank (1), wherein: The top of the methane tank (1) is equipped with a reflux hand valve (2) and a pipeline discharge valve (3), and the bottom of the methane tank (1) is connected to a liquid outlet pipe (4), which is equipped with a liquid outlet valve (5). A pressure transmitter (6) and a thermometer (7) are installed on the top of the methane tank (1). A flow meter (8) is provided at the inlet section of the liquid outlet pipe (4). The liquid outlet pipe (4) is arranged with a first temperature sensor (9), a second temperature sensor (10), a first pressure sensor (11), and a second pressure sensor (12) in sequence. The first temperature sensor (9) and the first pressure sensor (11) are located at the front end of the liquid outlet pipe (4), and the second temperature sensor (10) and the second pressure sensor (12) are located at the rear end of the liquid outlet pipe (4). The end of the liquid outlet pipe (4) is connected to the discharge port (13), and the front end of the discharge port (13) is equipped with an emergency shut-off valve (14). The emergency shut-off valve (14) is electrically connected to the control unit (15), and the control unit (15) is simultaneously connected to the pressure transmitter (6), thermometer (7), flow meter (8), first temperature sensor (9), second temperature sensor (10), first pressure sensor (11), and second pressure sensor (12). The control unit (15) is configured to trigger the emergency shut-off valve (14) to close when any sensor data exceeds a preset threshold. The methane tank (1) and the liquid outlet pipe (4) are connected by a flange seal. The diameter of the liquid outlet pipe (4) gradually decreases to form a pressurization section (16). The wall of the pressurization section (16) is provided with an annular guide groove (17), and the guide groove (17) is embedded with a shock-absorbing pad (18). The outside of the liquid outlet pipe (4) is wrapped with a heat insulation layer (19), and the space between the heat insulation layer (19) and the pipe is filled with heat insulation material (20).

2. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The annular guide grooves (17) are distributed at equal intervals along the axial direction of the pressurization section (16), and the distance between every two adjacent guide grooves (17) is 1.2-1.5 times the diameter of the pipe.

3. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The control unit (15) also includes a data storage module (21) for recording real-time data of the pressure transmitter (6), thermometer (7), flow meter (8), first temperature sensor (9), second temperature sensor (10), first pressure sensor (11) and second pressure sensor (12).

4. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The emergency shut-off valve (14) is a pneumatic shut-off valve. Its driving air source is connected to an external air pump through an independent pipeline (22). A manual emergency switch (23) is provided on the independent pipeline (22).

5. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The outer surface of the insulation layer (19) is provided with a temperature alarm (24), which is connected to the control unit (15) by signal. When the temperature of the insulation layer surface exceeds the set value, an alarm is triggered.

6. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The methane tank (1) is provided with a support frame (25) at the bottom, and a shock-absorbing support (26) is installed between the support frame (25) and the ground. The shock-absorbing support (26) is embedded with a damping spring (27).

7. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The pressure boosting section (16) of the liquid outlet pipe (4) is equipped with a pressure balancing valve (28) at the end, and the pressure balancing valve (28) is connected to the top of the methane tank (1) through a branch pipe (29).

8. The liquid methane pressurization and emission device as described in claim 7, characterized in that, A one-way valve (30) is installed on the branch pipe (29), and the opening direction of the one-way valve (30) is from the top of the methane tank (1) to the pressure balance valve (28).

9. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The top of the methane tank (1) is also equipped with a safety relief valve (31), and the relief pressure value of the safety relief valve (31) is higher than the preset threshold of the pressure transmitter (6).

10. The liquid methane pressurization and emission device as described in claim 1, characterized in that, The control unit (15) is also connected to a remote monitoring terminal (32), which is configured to display sensor data in real time and receive alarm signals sent by the control unit (15).

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