Methanol fuel supply system

Abstract

The invention relates to the technical field of methanol fuel supply, and discloses a methanol fuel supply system, which comprises a methanol supply pipeline, a methanol pressure regulating pipeline and a methanol discharge pipeline, and can regulate the opening degree of a pressure regulating valve in time when the system pressure fluctuates, so that the pressure is stabilized in a preset range. The precision and the response speed of pressure adjustment are greatly improved, it is ensured that follow-up equipment can obtain stable pressure supply, and normal operation of the equipment is guaranteed; by arranging a heat exchanger bypass valve, whether the methanol passes through the heat exchanger or not can be flexibly selected according to seasons or working condition requirements, so that the temperature of the methanol can be adjusted as required, unnecessary waste of energy is avoided, and the energy utilization efficiency of the system is improved; the liquid level switch on the methanol discharge pipeline is linked with the diaphragm pump, when the liquid level exceeds a preset value, the diaphragm pump is automatically started to discharge methanol, and the bypass valve of the diaphragm pump is used as a standby, so that the automation of monitoring and processing the liquid level of methanol in the discharge pipeline is realized.

Description

Technical Field

[0001] This invention relates to the field of methanol fuel supply technology, and more particularly to a methanol fuel supply system. Background Technology

[0002] As the core carrier of international trade, the shipping industry's carbon emissions have increasingly attracted high attention from the international community. Ships that are traditionally powered by heavy oil and diesel can no longer meet environmental protection requirements. Finding green alternative fuels has become an inevitable choice for the survival and development of shipping companies. Methanol, which combines environmental protection and economy, has become a green alternative fuel in the field of ship power.

[0003] Chinese invention patent CN222879792U discloses a methanol fuel supply system for a marine dual-fuel generator. In this technical solution, pressure is regulated only through a methanol fuel return pipeline and a pressure control valve. When the system pressure fluctuates significantly, the regulation accuracy and response speed may be insufficient, making it difficult to stably maintain the pressure required by subsequent equipment. Furthermore, this technical solution cannot adjust the appropriate methanol temperature according to seasonal or operational requirements, resulting in energy waste. Moreover, the monitoring and handling of the methanol level in the discharge pipeline lacks automation, posing a safety hazard. Summary of the Invention

[0004] To overcome at least one of the defects described in the prior art, this invention provides a methanol fuel supply system. By connecting a pressure regulating valve to a first pressure transmitter, the opening of the pressure regulating valve can be adjusted promptly when system pressure fluctuates, stabilizing the pressure within a preset range. This significantly improves the accuracy and response speed of pressure regulation, ensuring a stable pressure supply to downstream equipment and guaranteeing its normal operation. Furthermore, by setting a heat exchanger bypass valve, the system can flexibly select whether methanol passes through the heat exchanger according to seasonal or operational requirements, achieving on-demand adjustment of methanol temperature, avoiding unnecessary energy waste, and improving the system's energy efficiency. A level switch on the methanol discharge pipeline is linked to a diaphragm pump; when the level exceeds a preset value, the diaphragm pump automatically starts to discharge methanol. A diaphragm pump bypass valve serves as a backup, automating the monitoring and handling of methanol levels in the discharge pipeline.

[0005] The technical solution of this invention is implemented as follows: A methanol fuel supply system includes a methanol supply pipeline, a methanol pressure regulating pipeline, and a methanol discharge pipeline. The methanol supply pipeline is equipped with a methanol pump, a methanol heat exchanger, a dual filter, and a first pressure transmitter. The methanol pump pumps methanol fuel, the methanol heat exchanger stores a heat exchange medium, the dual filter filters impurities from the methanol fuel, and the first pressure transmitter monitors the pressure of the methanol supply pipeline. A heat exchanger bypass valve is also installed on the methanol supply pipeline, connected in parallel with the methanol heat exchanger. The methanol pressure regulating pipeline is connected in parallel with the methanol supply pipeline, and a pressure regulating valve is installed on the methanol pressure regulating pipeline, connected in parallel with the first pressure transmitter. The system is configured such that when the first pressure transmitter detects a pressure exceeding or falling below a preset value, the pressure regulating valve adjusts its opening to keep the pressure of the first pressure transmitter within the preset value range. The methanol discharge pipeline is connected in parallel with the methanol supply pipeline. A level switch, a diaphragm pump, and a check valve are sequentially installed on the methanol discharge pipeline. The level switch monitors the methanol fuel level on the methanol discharge pipeline and is connected to the diaphragm pump. When the level switch detects a level exceeding a preset value, it controls the diaphragm pump to open. The check valve prevents methanol fuel backflow. A diaphragm pump bypass valve is also installed on the methanol discharge pipeline, connected in parallel with the diaphragm pump and the check valve.

[0006] Based on the above technical solutions, preferably, it also includes a methanol daily storage cabinet, which is used to store methanol fuel, and one end of the methanol supply pipeline, the methanol pressure regulating pipeline and the methanol discharge pipeline are all connected to the methanol daily storage cabinet.

[0007] Based on the above technical solutions, preferably, two dual filters are provided, and the two dual filters are provided at both ends of the methanol supply pipeline.

[0008] Based on the above technical solutions, preferably, each of the dual filters includes two filter units, and the two filter units are arranged in parallel.

[0009] Based on the above technical solutions, preferably, differential pressure transmitters for measuring the differential pressure of the dual filter are provided at both ends of the dual filter.

[0010] Based on the above technical solution, preferably, a first nitrogen purge valve is provided near the methanol daily use cabinet on the methanol supply pipeline, and a second nitrogen purge valve is provided near the first pressure transmitter on the methanol supply pipeline. The first nitrogen purge valve and the second nitrogen purge valve are used to inertate the air in the methanol supply pipeline.

[0011] Based on the above technical solutions, preferably, the methanol supply pipeline is equipped with a methanol inlet valve near the methanol daily use cabinet for controlling the methanol fuel delivery rate, and the methanol supply pipeline is equipped with a methanol outlet valve near the second nitrogen purging valve for controlling the methanol fuel discharge rate.

[0012] Based on the above technical solutions, preferably, a heat exchanger front valve and a first temperature transmitter are connected in series near the methanol pump in the methanol heat exchanger, and a second temperature transmitter and a heat exchanger rear valve are connected in series near the first pressure transmitter in the methanol heat exchanger.

[0013] Based on the above technical solutions, preferably, at least two methanol pumps are provided, and the at least two methanol pumps are arranged in parallel. Each methanol pump is equipped with a methanol pump inlet valve and a methanol pump inlet pressure gauge in series near the methanol daily use cabinet. Each methanol pump is equipped with a methanol pump outlet pressure gauge, a methanol pump outlet check valve and a methanol pump outlet valve in series in sequence near the methanol heat exchanger.

[0014] Based on the above technical solutions, preferably, the methanol pressure regulating pipeline is also equipped with a methanol return valve, which is used to return the methanol fuel to the methanol daily use cabinet.

[0015] In summary, the methanol fuel supply system provided by this invention has the following advantages over the prior art: (1) By installing a pressure regulating valve connected to the first pressure transmitter on the methanol pressure regulating pipeline, when the first pressure transmitter detects that the pressure exceeds or falls below the preset value, the pressure regulating valve adjusts the opening to keep the pressure within the preset range. Compared with the prior art, which only uses the methanol fuel return pipeline and pressure control valve for pressure regulation, this system can achieve more precise pressure regulation and faster response when facing large pressure fluctuations, stably maintain the pressure required by subsequent equipment, and ensure stable system operation. (2) The setting of the methanol heat exchanger and the design of the bypass valve of the heat exchanger connected in parallel with the methanol heat exchanger enable the methanol temperature to be flexibly adjusted according to the season or working conditions. By controlling whether the methanol passes through the heat exchanger for heat exchange, energy waste caused by unsuitable temperature is avoided, and energy utilization efficiency is improved. (3) The liquid level switch monitors the methanol fuel liquid level and is connected to the diaphragm pump. When the liquid level exceeds the preset value, the diaphragm pump is automatically controlled to open for discharge. At the same time, the check valve prevents methanol fuel from flowing back. The methanol can also flow at a low speed through the diaphragm pump bypass valve when the diaphragm pump is not started, which increases the flexibility of the system. (4) Set up a dual filter to filter impurities in methanol fuel. Multiple dual filters can be set up according to different design requirements, and each dual filter contains two parallel filter units, which improves the filtration effect. At the same time, differential pressure transmitters are set up in parallel at both ends of the dual filter to measure the differential pressure of the dual filter, so as to understand the operating status of the filter in time, and to carry out maintenance and cleaning in time to ensure the normal operation of the filtration system. (5) A first nitrogen purge valve and a second nitrogen purge valve are respectively installed near the methanol daily use cabinet and near the first pressure transmitter in the methanol supply pipeline to inertize the air in the methanol supply pipeline, reduce the risk of methanol fuel and air mixing to form an explosive mixture, and improve the safety of the system. (6) A first temperature transmitter and a second temperature transmitter are installed near the methanol pump and near the first pressure transmitter of the methanol heat exchanger, respectively. These can monitor the temperature of methanol fuel before and after entering the heat exchanger in real time, providing accurate data support for temperature regulation and system operation, and ensuring that the temperature of methanol fuel is within a suitable range. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the pipeline connection according to an embodiment of the present invention; The meanings of the reference numerals in the attached diagrams are as follows: 1. Methanol daily use cabinet; 2. Methanol inlet valve; 3. First nitrogen purge valve; 4. Third temperature transmitter; 5. Dual filter; 6. Differential pressure transmitter; 7. Methanol reflux valve; 8. First vent valve; 9. Methanol pump inlet valve; 10. Methanol pump inlet pressure gauge; 11. Methanol pump; 12. Methanol pump outlet pressure gauge; 13. Methanol pump outlet check valve; 14. Methanol pump outlet valve; 15. Methanol supply pipeline; 16. Methanol pressure regulating pipeline; 17. Methanol discharge pipeline; 18. Filter unit; 19. First connecting line; 20. Second connecting line; 21. Second pressure transmitter; 22. 23. Second relief valve; 24. Heat exchanger inlet valve; 25. First temperature transmitter; 26. Methanol heat exchanger; 27. Second temperature transmitter; 28. Heat exchanger outlet valve; 29. ​​Heat exchanger bypass valve; 30. Third connection line; 31. Fourth connection line; 32. Pressure regulating valve; 33. First pressure transmitter; 34. Third relief valve; 35. Second nitrogen purging valve; 36. Methanol outlet valve; 37. Methanol return valve; 38. Level switch; 39. Diaphragm pump inlet valve; 40. Diaphragm pump; 41. Third pressure transmitter; 42. Check valve; 43. Diaphragm pump outlet valve; 44. Diaphragm pump bypass valve. Detailed Implementation

[0018] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] See Figure 1 The present invention discloses a methanol fuel supply system, including a methanol supply pipeline 15, a methanol pressure regulating pipeline 16, a methanol discharge pipeline 17, and a methanol daily use cabinet 1.

[0020] See Figure 1As shown, in this embodiment, one end of the methanol supply pipeline 15 is connected to the methanol daily storage tank 1, and the other end of the methanol supply pipeline 15 is connected to the fuel valve assembly unit. The methanol daily storage tank 1 is used to store methanol fuel, and the methanol supply pipeline 15 is used to transport the methanol fuel in the methanol daily storage tank 1 to the fuel valve assembly unit, and then provide fuel to the ship's engine or ship's generator. From near the methanol daily storage tank 1 to the fuel valve assembly unit, the methanol supply pipeline 15 is sequentially equipped with a methanol pump 11, a methanol heat exchanger 25, a dual filter 5, and a first pressure transmitter 33. The methanol pump 11 is used to pump methanol fuel, specifically, the methanol pump 11 is used to pump the methanol fuel in the methanol daily storage tank 1. The methanol heat exchanger 25 stores a heat exchange medium, which is used to exchange heat with the methanol fuel. The dual filter 5 is used to filter impurities in the methanol fuel on the methanol supply pipeline 15. The first pressure transmitter 33 is used to monitor the pressure in the methanol supply pipeline 15.

[0021] See Figure 1 As shown, in this embodiment, two dual filters 5 are provided, located at both ends of the methanol supply pipeline 15. Specifically, one dual filter 5 is located between the methanol day tank 1 and the methanol pump 11, and the other dual filter 5 is located between the methanol heat exchanger 25 and the fuel oil valve assembly unit. The dual filters 5 can filter out small solid impurities, small solid particles, and rust in the methanol fuel, preventing these impurities from entering the subsequent fuel oil valve assembly unit, flow meter, marine engine, or marine generator, thereby protecting the equipment from wear and blockage and extending the service life of the equipment. Specifically, the dual filter 5 between the methanol day tank 1 and the methanol pump 11 can filter out impurities in the methanol fuel, protecting the methanol pump 11; the dual filter 5 between the methanol heat exchanger 25 and the fuel oil valve assembly unit can further filter out impurities in the methanol fuel, protecting the subsequent fuel oil valve assembly unit, flow meter, marine engine, or marine generator.

[0022] More specifically, each dual filter 5 includes two filter units 18, which are arranged in parallel and can be switched at any time via a three-way valve. When one filter unit 18 is filtering, the other filter unit 18 can be cleaned or have its filter element replaced, which improves the stability of the system operation and reduces downtime for maintenance.

[0023] See Figure 1As shown in this embodiment, differential pressure transmitters 6 are installed at both ends of the dual filter 5 to measure the differential pressure of the dual filter 5. During operation, as the filtration time increases, the filter element in the dual filter 5 will gradually become clogged with impurities, leading to increased resistance to fluid flow. The differential pressure transmitters 6 can measure the pressure difference between the inlet and outlet of the dual filter 5 in real time. The pressure difference between the inlet and outlet of the dual filter 5 can reflect the clogging status of the filter element. By monitoring the differential pressure value, the operator can accurately understand the current filtration status of the filter and determine whether the filter element needs to be cleaned or replaced. The differential pressure transmitters 6 can detect abnormal changes in the differential pressure of the dual filter 5 in a timely manner. When the differential pressure exceeds the set value, the system can issue an alarm signal to remind the operator to take measures, such as switching to another filter unit 18 or cleaning the filter element, thereby avoiding abnormal fluctuations in system pressure caused by the clogging of the dual filter 5 and ensuring the stable operation of the entire methanol fuel supply system.

[0024] See Figure 1 As shown, in this embodiment, a methanol feed valve 2 for controlling the methanol fuel delivery rate is installed near the methanol daily use cabinet 1 on the methanol supply pipeline 15, and a methanol outlet valve 36 for controlling the methanol fuel discharge rate is installed near the fuel oil valve group unit on the methanol supply pipeline 15. The methanol feed valve 2 is the root valve of the methanol supply pipeline, and its opening degree can control the methanol fuel delivery rate and flow rate. Both the methanol feed valve 2 and the methanol outlet valve 36 are pneumatically controlled and have an emergency shut-off function. When the system detects a methanol fuel leak, the emergency shut-off function triggers the valve to close immediately, cutting off the methanol fuel supply upstream of the leak point and preventing the leak from expanding.

[0025] See Figure 1 As shown, in this embodiment, a first nitrogen purge valve 3 is installed near the methanol daily use cabinet 1 on the methanol supply pipeline 15, and a second nitrogen purge valve 35 is installed near the first pressure transmitter 33 on the methanol supply pipeline 15. The first nitrogen purge valve 3 and the second nitrogen purge valve 35 are used to inertize the air in the methanol supply pipeline 15. During the commissioning phase, nitrogen is introduced to fully inertize the air in the methanol supply pipeline 15, reduce the oxygen content in the methanol supply pipeline 15, and prepare for the delivery of methanol fuel to the methanol supply pipeline 15. During the shutdown phase, nitrogen is introduced to purge the methanol fuel in the pipeline to the methanol daily use cabinet 1, reducing the risk of fire.

[0026] The first nitrogen purge valve 3 and the second nitrogen purge valve 35 work together to perform comprehensive air inerting treatment on the entire methanol supply pipeline 15. By introducing nitrogen, the oxygen content in the methanol supply pipeline 15 can be significantly reduced, thereby reducing the possibility of methanol and air forming an explosive mixture and increasing the safety barrier. Moreover, the first nitrogen purge valve 3 and the second nitrogen purge valve 35 are respectively located at different positions on the methanol supply pipeline 15. The first nitrogen purge valve 3, which is closer to the methanol daily use cabinet 1, can focus on treating the methanol supply pipeline 15 at the fuel storage end, while the second nitrogen purge valve 35, which is closer to the pressure transmitter, can cover the methanol supply pipeline 15 at the system monitoring end, avoiding purging dead zones and ensuring that the entire methanol supply pipeline 15 is in a safe inert environment, further improving the reliability of system operation.

[0027] It should also be noted that the first nitrogen purge valve 3 and the second nitrogen purge valve 35 are still connected to the nitrogen supply pipeline. Nitrogen is supplied through the nitrogen supply pipeline, and nitrogen is supplied to the methanol supply pipeline 15 by opening and closing the first nitrogen purge valve 3 and the second nitrogen purge valve 35, so as to achieve the inerting effect.

[0028] See Figure 1 As shown, in this embodiment, the methanol heat exchanger 25 exchanges heat with methanol fuel through a heat exchange medium, raising the methanol fuel to the temperature required by the ship's engine or generator. The heat exchange medium stored in the methanol heat exchanger 25 is ethylene glycol water. Ethylene glycol water has good heat transfer efficiency and can efficiently exchange heat with methanol fuel, quickly adjusting the methanol temperature to meet the methanol temperature requirements under different seasons or operating conditions, ensuring a stable supply of methanol fuel at a suitable temperature, and improving system operating efficiency. Moreover, ethylene glycol water has a low freezing point and a high boiling point, making it less likely to freeze or boil within a wide temperature range that the ship may encounter during operation. It can stably maintain a liquid state, ensuring a continuous and reliable heat exchange process, avoiding heat exchange interruptions due to changes in the medium's state, and reducing the risk of system failure.

[0029] See Figure 1 As shown, in this embodiment, a heat exchanger bypass valve 28 is also installed on the methanol supply pipeline 15. The heat exchanger bypass valve 28 is connected in parallel with the methanol heat exchanger 25. The heat exchanger bypass valve 28 is opened during seasons when the methanol temperature does not require heat exchange, saving system energy. When heat exchange is not required through the heat exchanger, the heat exchanger bypass valve 28 can be opened, allowing methanol fuel to flow directly through the bypass, avoiding unnecessary entry of methanol into the heat exchanger to participate in heat exchange, reducing energy loss and resistance loss during the heat exchange process, and improving system operating efficiency.

[0030] See Figure 1As shown, in this embodiment, a third temperature transmitter 4 is also provided between the first nitrogen purge valve 3 and the dual filter 5 near the methanol daily use tank 1. The temperature of the methanol fuel sent from the methanol daily use tank 1 can be detected by the third temperature transmitter 4.

[0031] See Figure 1 As shown, in this embodiment, a heat exchanger front valve 23 and a first temperature transmitter 24 are connected in series near the methanol pump 11 in the methanol heat exchanger 25. A second temperature transmitter 26 and a heat exchanger rear valve 27 are connected in series near the first pressure transmitter 33 in the methanol heat exchanger 25. The first temperature transmitter 24 is located near the methanol pump 11 in the methanol heat exchanger 25 and can monitor the initial temperature of methanol before it enters the heat exchanger in real time. The second temperature transmitter 26 is located on the side of the heat exchanger near the pressure transmitter and can accurately capture the final temperature of methanol after heat exchange. The temperature difference data formed by the two can intuitively reflect the heat exchange efficiency of the heat exchanger, providing accurate parameter basis for operators or automatic control systems to adjust the supply of heat exchange medium and control the opening of the heat exchanger bypass valve 28, ensuring that the methanol temperature is stable within a suitable range and meets the operating requirements of subsequent equipment. The heat exchanger front valve 23 and the heat exchanger rear valve 27 are maintenance valves, which are closed when the heat exchanger is inspected or replaced, thus achieving the effect of non-stop maintenance of the methanol fuel supply system.

[0032] See Figure 1As shown, in this embodiment, at least two methanol pumps 11 are provided, and at least two methanol pumps 11 are connected in parallel. Each methanol pump 11 has a methanol pump inlet valve 9 and a methanol pump inlet pressure gauge 10 connected in series near the methanol daily use tank 1. Each methanol pump 11 has a methanol pump outlet pressure gauge 12, a methanol pump outlet check valve 13, and a methanol pump outlet valve 14 connected in series near the methanol heat exchanger 25. Specifically, in this embodiment, two methanol pumps 11 are provided, and the methanol pumps 11 are variable frequency driven centrifugal magnetic pumps, providing power for the transfer and pressurization of methanol fuel. The two methanol pumps 11 are configured in a one-in-one standby configuration. When one methanol pump 11 fails, the other methanol pump 11 can immediately take over the fuel supply task, ensuring uninterrupted methanol fuel supply and preventing the ship's power system from shutting down due to methanol fuel shortage. This is particularly suitable for shipping scenarios with extremely high requirements for continuous operation. Furthermore, the methanol pump inlet pressure gauge 10 and methanol pump outlet pressure gauge 12 connected in series on each methanol pump 11 can provide real-time feedback on the working pressure of the methanol pump 11. The pump's operating efficiency can be judged by comparing the pressure difference between the inlet and outlet. For example, a large pressure difference may indicate impeller wear or pipeline blockage, enabling early warning of faults. Moreover, the methanol pump inlet valve 9 and methanol pump outlet valve 14 provide convenience for individual maintenance. When it is necessary to maintain or replace the methanol pump 11, it is only necessary to close the corresponding methanol pump inlet valve 9 and methanol pump outlet valve 14. The operation can be carried out without affecting the normal operation of other pumps, which greatly shortens maintenance downtime and reduces the impact on the overall system operation. Furthermore, the use of the methanol pump outlet check valve 13 can prevent methanol fuel from flowing back into the methanol pump 11 and maintain stable system pressure.

[0033] See Figure 1 As shown, in this embodiment, a second pressure transmitter 21 is provided between the methanol pump 11 and the methanol heat exchanger 25 to detect the pressure of the methanol fuel after passing through the methanol pump 11.

[0034] Among them, in this embodiment, the methanol fuel on the methanol supply pipeline 15 sequentially passes through the methanol feed valve 2, the first nitrogen purge valve 3, the third temperature transmitter 4, one of the double filters 5, the pre-methanol pump valve 9, the methanol pump inlet pressure gauge 10, the methanol pump 11, the methanol pump outlet pressure gauge 12, the methanol pump outlet check valve 13, the post-methanol pump valve 14, the second pressure transmitter 21, the pre-heat exchanger valve 23, the first temperature transmitter 24, the methanol heat exchanger 25, the second temperature transmitter 26, the post-heat exchanger valve 27, the other double filter 5, the first pressure transmitter 33, the second nitrogen purge valve 35 and the methanol outlet valve 36 and enters the fuel valve group unit; the methanol fuel first controls the conveying rate through the methanol feed valve 2, and then is preliminarily filtered through one of the double filters 5, which can remove larger impurities before entering the methanol pump 11, avoiding impurities entering the pump body and causing failures such as wear and jamming, protecting the core power equipment. After passing through heat exchange, pressure regulation and other links, the methanol fuel is then secondarily filtered through the other double filter 5, which can further remove impurities that may be generated during the heat exchange process or residual pollutants in the pipeline, ensuring the cleanliness of the methanol entering the fuel valve group unit, reducing the risk of blockage of subsequent precision components, and improving the overall life of the system; the third temperature transmitter 4 monitors the temperature of the fuel entering the system at the initial stage, providing a benchmark for subsequent heat exchange regulation; the inlet and outlet pressure gauges of the methanol pump 11 reflect the working state of the methanol pump 11 in real time, and the first temperature transmitter 24 and the second temperature transmitter 26 respectively monitor the temperatures before and after heat exchange, intuitively reflecting the heat exchanger efficiency; the second pressure transmitter 21 monitors the pressure before entering the heat exchanger, and the first pressure transmitter 33 controls the final pressure before entering the fuel valve group. These data are interrelated, enabling full-process tracking of the fuel state. Once an abnormality occurs, the problem link can be quickly located, providing an accurate basis for timely regulation.

[0035] Refer to Figure 1As shown, in this embodiment, the methanol pressure regulating line 16 and the methanol supply line 15 are connected in parallel. A pressure regulating valve 32 is installed on the methanol pressure regulating line 16, and the pressure regulating valve 32 is connected to a first pressure transmitter 33. When the first pressure transmitter 33 detects that the pressure exceeds or falls below a preset value, the pressure regulating valve 32 adjusts its opening to keep the pressure of the first pressure transmitter 33 within the preset value range. The first pressure transmitter 33 directly monitors the final pressure before entering the fuel valve group unit. This pressure is directly related to the operating requirements of subsequent equipment. When the pressure deviates from the preset value, the pressure regulating valve 32 can respond in real time and adjust its opening. By changing the fuel flow rate returning to the methanol daily use tank 1, the pressure in the methanol supply line 15 is dynamically balanced, ensuring that the methanol pressure entering the fuel valve group is always stable within a suitable range, guaranteeing the efficient and safe operation of subsequent equipment. A methanol reflux valve 7 is also installed on the methanol pressure regulating line 16 and the methanol supply line 15 for returning methanol fuel. The methanol reflux valve 7 is located between the methanol feed valve 2 and the methanol pump 11.

[0036] Specifically, one end of the methanol pressure regulating pipeline 16 is connected to the methanol daily use cabinet 1, and the other end of the methanol pressure regulating pipeline 16 is connected to the methanol supply pipeline 15. Specifically, the other end of the methanol pressure regulating pipeline 16 is located between the dual filter 5 and the first pressure transmitter 33, and a methanol return valve 37 is also provided on the methanol pressure regulating pipeline 16. When the first pressure transmitter 33 detects that the pressure exceeds or falls below the preset value, the pressure regulating valve 32 adjusts the opening to make the pressure of the first pressure transmitter 33 within the preset value. At this time, the methanol return valve 37 opens to allow methanol fuel to flow back to the methanol daily use cabinet 1.

[0037] See Figure 1As shown, in this embodiment, the methanol discharge pipeline 17 is connected in parallel with the methanol supply pipeline 15. A level switch 38, a diaphragm pump 40, and a check valve 42 are sequentially installed on the methanol discharge pipeline 17. The level switch 38 monitors the methanol fuel level on the methanol discharge pipeline 17. The level switch 38 is connected to the diaphragm pump 40. When the level switch 38 detects that the level exceeds a preset value, it controls the diaphragm pump 40 to open. The check valve 42 prevents methanol fuel backflow. A diaphragm pump bypass valve 44 is also installed on the methanol discharge pipeline 17, and the diaphragm pump bypass valve 44 is connected in parallel with the diaphragm pump 40 and the check valve 42. One end of the methanol discharge pipeline 17 is connected to the methanol supply pipeline 15. Connected to cabinet 1, the other end of methanol discharge pipeline 17 is connected to methanol supply pipeline 15. Liquid level switch 38 measures the methanol liquid level in methanol discharge pipeline and alarms when the liquid level is high, interlocking to start diaphragm pump 40 to send the discharged methanol fuel back to methanol daily use cabinet 1, avoiding the risk of leakage due to excessive liquid level. The check valve 42 effectively blocks the reverse flow of methanol, which can prevent the discharged methanol from flowing back to the discharge pipeline due to system pressure fluctuations, avoiding secondary liquid level exceeding the standard or contamination of the supply system, and ensuring the unidirectionality and stability of the discharge process; and the diaphragm pump bypass valve 44 allows methanol fuel to flow at a low speed when diaphragm pump 40 is not started.

[0038] In this embodiment, a diaphragm pump inlet valve 39 is sequentially installed between the diaphragm pump 40 and the methanol supply pipeline 15. A third pressure transmitter 41, a check valve 42, and a diaphragm pump outlet valve 43 are sequentially installed between the diaphragm pump 40 and the methanol daily use cabinet 1. The valves before the diaphragm pump inlet valve 39 and the diaphragm pump outlet valve 43 are maintenance valves, which are closed when the diaphragm pump 40 is inspected or replaced, thus achieving the effect of non-stop maintenance of the methanol fuel supply system. The third pressure transmitter 41 is used to monitor the pressure of the methanol fuel after passing through the diaphragm pump 40.

[0039] Specifically, the first connecting line 19 at the connection between the other end of the methanol discharge pipeline 17 and the methanol supply pipeline 15 is located between the dual filter 5 and the methanol pump 11, and a first relief valve 8 is installed on the first connecting line 19; the second connecting line 20 at the connection between the other end of the methanol discharge pipeline 17 and the methanol supply pipeline 15 is located between the second pressure transmitter 21 and the heat exchanger inlet valve 23, and a second relief valve 22 is installed on the second connecting line 20; the third connecting line at the connection between the other end of the methanol discharge pipeline 17 and the methanol supply pipeline 15... The third connection line 30 is located between the heat exchanger downstream valve 27 and the first pressure transmitter 33. A third relief valve 29 is installed on the third connection line 30. The fourth connection line 31 at the connection between the other end of the methanol discharge pipeline 17 and the methanol supply pipeline 15 is located between the first pressure transmitter 33 and the second nitrogen purging valve 35. A fourth relief valve is installed on the fourth connection line 31 to facilitate the return of methanol fuel to the methanol daily use cabinet 1 through the methanol discharge pipeline 17 via the first relief valve 8, the second relief valve 22, the third relief valve 29 and the fourth relief valve.

[0040] Specific implementation steps: Open the first nitrogen purge valve 3 and the second nitrogen purge valve 35 to introduce nitrogen into the methanol supply line 15. Open the methanol feed valve 2, and the methanol pump 11 will pump methanol fuel into the methanol supply line 15. After passing through the first dual filter 5 for impurity filtration, when the methanol fuel requires temperature adjustment, close the heat exchanger bypass valve 28. The methanol fuel enters the methanol heat exchanger 25, undergoes heat exchange, and then flows out. The first temperature transmitter 24 monitors the temperature before heat exchange, and the second temperature transmitter 26 monitors the temperature after heat exchange. The temperature difference between the two reflects the heat exchange efficiency. The operator can adjust the supply of heat exchange medium according to the temperature difference to ensure that the fuel temperature meets the standard. If the methanol fuel temperature does not need to be adjusted, close the heat exchanger inlet valve 23 and the heat exchanger outlet valve 27, and open the heat exchanger bypass valve 28. The fuel flows directly through the heat exchanger bypass valve 28 and undergoes secondary filtration of impurities through the dual filter 5 to ensure the purity of the methanol fuel. The methanol fuel continues to be supplied. If the first pressure transmitter 33 monitors... When the pressure is detected to be higher than the preset value, the pressure regulating valve 32 automatically increases its opening and simultaneously opens the methanol return valve 37. Part of the heating fuel flows back to the methanol daily use tank 1 through the methanol pressure regulating pipeline 16, reducing the pressure in the methanol supply pipeline 15 until the pressure returns to the preset range. If the first pressure transmitter 33 detects that the pressure is lower than the preset value, the pressure regulating valve 32 automatically decreases its opening, reducing the amount of fuel returning. The pressure in the methanol supply pipeline 15 gradually increases until it returns to the preset range. When fuel stagnation or abnormal liquid accumulation occurs in a certain section of the methanol supply pipeline 15, the fuel is recovered through the methanol discharge pipeline 17 to avoid leakage risks. The level switch 38 detects the level of methanol fuel in the discharge pipeline and discharges the methanol fuel through the first discharge valve 8, the second discharge valve 22, the third discharge valve 29, and the fourth discharge valve. After the diaphragm pump 40 starts, the diaphragm pump bypass valve 44 is closed. After being pressurized by the diaphragm pump 40, the methanol fuel flows back to the methanol daily use tank 1.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A methanol fuel supply system, characterized in that, This includes a methanol supply pipeline (15), a methanol pressure regulating pipeline (16), and a methanol discharge pipeline (17), among which, The methanol supply pipeline (15) is equipped with a methanol pump (11), a methanol heat exchanger (25), a dual filter (5), and a first pressure transmitter (33). The methanol pump (11) is used to pump methanol fuel. The methanol heat exchanger (25) stores heat exchange medium. The dual filter (5) is used to filter impurities in the methanol fuel. The first pressure transmitter (33) is used to monitor the pressure of the methanol supply pipeline (15). The methanol supply pipeline (15) is also equipped with a heat exchanger bypass valve (28), which is connected in parallel with the methanol heat exchanger (25). The methanol pressure regulating pipeline (16) is connected in parallel with the methanol supply pipeline (15). A pressure regulating valve (32) is provided on the methanol pressure regulating pipeline (16). The pressure regulating valve (32) is connected to the first pressure transmitter (33). When the first pressure transmitter (33) detects that the pressure exceeds or falls below the preset value, the pressure regulating valve (32) adjusts the opening to make the pressure of the first pressure transmitter (33) between the preset values. The methanol discharge pipeline (17) is connected in parallel with the methanol supply pipeline (15). A level switch (38), a diaphragm pump (40), and a check valve (42) are sequentially installed on the methanol discharge pipeline (17). The level switch (38) is used to monitor the methanol fuel level on the methanol discharge pipeline (17). The level switch (38) is connected to the diaphragm pump (40). When the level switch (38) detects that the liquid level exceeds a preset value, it controls the diaphragm pump (40) to open. The check valve (42) is used to prevent methanol fuel backflow. A diaphragm pump bypass valve (44) is also installed on the methanol discharge pipeline (17). The diaphragm pump bypass valve (44) is connected in parallel with the diaphragm pump (40) and the check valve (42).

2. The methanol fuel supply system according to claim 1, characterized in that, It also includes a methanol daily storage cabinet (1), which is used to store methanol fuel. One end of the methanol supply pipeline (15), the methanol pressure regulating pipeline (16) and the methanol discharge pipeline (17) are all connected to the methanol daily storage cabinet (1).

3. A methanol fuel supply system according to claim 1, characterized in that, Two dual filters (5) are provided, and the two dual filters (5) are located at both ends of the methanol supply pipeline (15).

4. A methanol fuel supply system according to claim 3, characterized in that, Each of the dual filters (5) includes two filter units (18) arranged in parallel.

5. A methanol fuel supply system according to claim 3 or 4, characterized in that, Differential pressure transmitters (6) for measuring the differential pressure of the dual filter (5) are provided at both ends of the dual filter (5).

6. A methanol fuel supply system according to claim 2, characterized in that, A first nitrogen purge valve (3) is provided near the methanol daily use cabinet (1) of the methanol supply line (15), and a second nitrogen purge valve (35) is provided near the first pressure transmitter (33) of the methanol supply line (15). The first nitrogen purge valve (3) and the second nitrogen purge valve (35) are used to inert the air in the methanol supply line (15).

7. A methanol fuel supply system according to claim 6, characterized in that, The methanol supply pipeline (15) is equipped with a methanol feed valve (2) for controlling the methanol fuel delivery rate near the methanol daily use cabinet (1), and the methanol supply pipeline (15) is equipped with a methanol outlet valve (36) for controlling the methanol fuel discharge rate near the second nitrogen purging valve (35).

8. A methanol fuel supply system according to claim 1, characterized in that, The methanol heat exchanger (25) is connected in series with a heat exchanger front valve (23) and a first temperature transmitter (24) near the methanol pump (11), and the methanol heat exchanger (25) is connected in series with a second temperature transmitter (26) and a heat exchanger rear valve (27) near the first pressure transmitter (33).

9. A methanol fuel supply system according to claim 2, characterized in that, At least two methanol pumps (11) are provided, and at least two methanol pumps (11) are connected in parallel. Each methanol pump (11) is connected in series with a methanol pump inlet valve (9) and a methanol pump inlet pressure gauge (10) near the methanol daily use cabinet (1). Each methanol pump (11) is connected in series with a methanol pump outlet pressure gauge (12), a methanol pump outlet check valve (13) and a methanol pump outlet valve (14) near the methanol heat exchanger (25).

10. A methanol fuel supply system according to claim 2, characterized in that, The methanol pressure regulating pipeline (16) is also equipped with a methanol return valve (37) for returning the methanol fuel to the methanol daily use cabinet (1).

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