Marine methanol fuel regulation and control system

Abstract

The utility model provides a marine methanol fuel regulation and control system which comprises a supply device used for outputting methanol to an engine; the monitoring device is connected with the supply device and is used for acquiring the pressure in the supply device; the purging device is connected with the supply device and is used for purging the methanol in the supply device; the releasing device is connected with the purging device and is used for receiving and releasing the methanol discharged by the purging device; and the pneumatic device is connected with the supply device, the monitoring device, the purging device and the relief device and used for controlling opening and closing of the supply device, the purging device and the relief device according to the pressure obtained by the monitoring device. According to the marine methanol fuel regulation and control system, methanol fuel with appropriate pressure and flow can be provided for equipment such as a high-pressure methanol dual-fuel medium-speed engine, meanwhile, the pneumatic device can achieve internal control of the system, and related functions are completed.

Description

Technical Field

[0001] The present application belongs to the field of ship and shipping technology, and specifically relates to a ship methanol fuel control system. Background Art

[0002] Methanol is gaining increasing attention as a new alternative marine fuel, and the corresponding research, development, and promotion of methanol-powered marine engines are progressing steadily. Thanks to the dedicated efforts of major engine manufacturers over the past decade, the development of methanol-powered marine engines has achieved a significant leap from zero to reality, from a single technological approach to a multi-pronged approach.

[0003] Current equipment, such as high-pressure methanol dual-fuel medium-speed engines, requires a supporting methanol fuel control system to provide the appropriate pressure and flow rate of methanol fuel. Existing methanol fuel control systems are designed for specific engine requirements and lack return lines or further bleed and return flow collection functions. This makes emergency stops impossible and presents a high risk of operational hazards. Utility Model Content

[0004] The present application provides a marine methanol fuel control system, which aims to solve the problem that existing marine methanol fuel control systems do not have a discharge, reflux and collection function.

[0005] The first embodiment of the present application provides a marine methanol fuel control system, comprising:

[0006] a supply device, the supply device being used to output methanol to the engine;

[0007] a monitoring device connected to the supply device and configured to obtain the pressure in the supply device;

[0008] a purge device connected to the supply device and used to purge methanol in the supply device;

[0009] a discharge device, the discharge device being connected to the purge device and being used to receive and discharge the methanol discharged from the purge device;

[0010] A pneumatic device is connected to the supply device, the monitoring device, the purge device and the discharge device respectively, and is used to control the opening and closing of the supply device, the purge device and the discharge device respectively according to the pressure obtained by the monitoring device.

[0011] In some embodiments, the supply device includes a fuel manual shut-off valve, a fuel filter, a first supply shut-off valve, a pneumatic relief valve, a second supply shut-off valve, and a pressure regulating valve connected in sequence, wherein the pressure regulating valve is connected to the engine via a pipeline;

[0012] The monitoring device includes a first pressure transmitter, a second pressure transmitter and a third pressure transmitter;

[0013] The first pressure transmitter is connected between the fuel manual shut-off valve and the first supply shut-off valve and is used to monitor the initial pressure in the supply device;

[0014] The second pressure transmitter is connected between the first supply shut-off valve and the second supply shut-off valve and is used to monitor the pressure difference of the fuel filter;

[0015] The first pressure transmitter and the second pressure transmitter are subjected to a leakage test procedure for monitoring internal leakage of the first supply shut-off valve, the pneumatic relief valve and the second supply shut-off valve.

[0016] The third pressure transmitter is connected between the pressure regulating valve and the engine, and is used to monitor the pressure entering the engine.

[0017] In some embodiments, the pneumatic device includes a compressed air shut-off valve, a pneumatic two-way valve, a first solenoid valve, a second solenoid valve, and a third solenoid valve, wherein the compressed air shut-off valve and the pneumatic two-way valve are connected in series, and the first solenoid valve, the second solenoid valve, and the third solenoid valve are respectively connected to the pneumatic two-way valve;

[0018] The first solenoid valve is connected to the first supply stop valve and is used to control the opening and closing of the first supply stop valve;

[0019] The second solenoid valve is connected to the pneumatic relief valve and is used to control the switch of the pneumatic relief valve;

[0020] The third solenoid valve is connected to the second supply stop valve and is used to control the opening and closing of the second supply stop valve;

[0021] The pneumatic two-way connection is connected to the pressure regulating valve and is used to control the pressure regulating valve to adjust the pressure in the supply device.

[0022] In some embodiments, the purge device includes a purge manual stop valve, a purge filter, a first purge stop valve, a purge relief valve, and a purge relief check valve connected in sequence;

[0023] A bypass pipeline is connected between the first purge stop valve and the purge relief valve, and the other end of the bypass pipeline is connected to the supply device;

[0024] The purge and relief check valve is connected to the discharge device.

[0025] In some embodiments, the bypass line includes a second purge stop valve and a purge stop check valve, wherein the second purge stop valve is connected to the first purge stop valve and the purge relief valve respectively, and the purge stop check valve is connected to the second supply stop valve and the pressure regulating valve respectively;

[0026] The pneumatic device includes a fourth solenoid valve, which is connected to the second purge stop valve and is used to control the switch of the second purge stop valve.

[0027] In some embodiments, a recovery device is further included, which is connected to the discharge device and is used to receive the methanol discharged from the discharge device and recover the methanol to a storage tank.

[0028] In some embodiments, the recovery device includes a reflux shut-off valve, and the discharge device is connected to a downstream pipeline of the reflux shut-off valve;

[0029] The pneumatic device includes a fifth solenoid valve, which is connected to the reflux cut-off valve and is used to control the switch of the reflux cut-off valve.

[0030] In some embodiments, the monitoring device further includes a pressure gauge connected to the fuel filter.

[0031] In some embodiments, the supply device further includes a temperature transmitter, which is connected between the pressure regulating valve and the engine and is used to monitor the temperature of the methanol entering the engine.

[0032] In some embodiments, a liquid collecting device is further included, and the liquid collecting device covers the areas where the supply device, the purge device and the discharge device are located.

[0033] In some embodiments, the liquid collecting device includes a residual discharge pipeline, and a manual residual discharge valve is provided on the residual discharge pipeline.

[0034] In some embodiments, the monitoring device includes a drain valve level gauge, which is connected to the manual drain valve and is used to monitor the liquid level in the drain pipeline.

[0035] The present application provides a marine methanol fuel control system, comprising: a supply device, the supply device is used to output methanol to the engine; a monitoring device, the monitoring device is connected to the supply device, and is used to obtain the pressure in the supply device; a purge device, the purge device is connected to the supply device, and is used to purge the methanol in the supply device; a discharge device, the discharge device is connected to the purge device, and is used to receive and discharge the methanol discharged by the purge device; a pneumatic device, the pneumatic device is respectively connected to the supply device, the monitoring device, the purge device and the discharge device, and is used to control the opening and closing of the supply device, the purge device and the discharge device according to the pressure obtained by the monitoring device. The marine methanol fuel control system provided in the present application can provide methanol fuel of suitable pressure and flow for equipment such as high-pressure methanol dual-fuel medium-speed engines, and has the functions of nitrogen purge, fuel emergency cut-off and discharge from the control system to the main engine. At the same time, the pneumatic device can control the valves in the supply device, the monitoring device and the purge device to realize internal control of the system and complete related functions. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] The following detailed description of the specific embodiments of the present application in conjunction with the accompanying drawings will make the technical solutions and other beneficial effects of the present application apparent.

[0037] Figure 1 A schematic diagram of the structural principle of a marine methanol fuel control system provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structural principle of a marine methanol fuel control system provided in another embodiment of the present application;

[0039] Figure 3 A schematic diagram of the structure of a marine methanol fuel control system provided in an embodiment of the present application;

[0040] Figure 4 A schematic structural diagram of a marine methanol fuel control system provided in another embodiment of the present application;

[0041] Reference numerals:

[0042] 1-Fuel manual shut-off valve, 2-Fuel filter, 3-First supply shut-off valve, 4-Pneumatic relief valve, 5-Second supply shut-off valve, 6-Pressure regulating valve, 7-Backflow shut-off valve, 8-Purge manual shut-off valve, 9-Purge filter, 10-First purge shut-off valve, 11-Purge relief valve, 12-Second purge shut-off valve, 13-Purge shut-off check valve, 14-Purge relief check valve, 15-Relief check valve, 16-Compressed air shut-off valve, 17-Pneumatic two-way fitting, 18-First solenoid valve, 19-Second solenoid valve, 20-First Three solenoid valves, 21-fourth solenoid valve, 22-fifth solenoid valve, 23-manual drain valve, 24-first pressure transmitter, 25-pressure gauge, 26-second pressure transmitter, 27-third pressure transmitter, 28-temperature transmitter, 29-fourth pressure transmitter, 30-fifth pressure transmitter, 31-drain valve level gauge, 32-supply line, 33-purge line, 34-return line, 35-pneumatic line, 36-drain line, 37-drain line, 38-liquid collection tray, 39-junction box, 40-control box;

[0043] C1-supply liquid inlet, C2-supply liquid outlet, C3-purge inlet, C4-reflux liquid inlet, C5-reflux liquid outlet, C6-compressed air inlet, C7-residue discharge outlet. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without making creative efforts are within the scope of protection of this application.

[0045] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be directly connected, or indirectly connected through an intermediate medium, or indirectly connected through a pipe or pipeline, and it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances. In the description of this application, the meaning of "multiple" is two or more, unless otherwise clearly specified and specifically limited. In addition, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more features.

[0046] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application.

[0047] The first embodiment of the present application provides a marine methanol fuel control system. Figure 1 include:

[0048] A supply device, the supply device is used to output methanol to the engine;

[0049] A monitoring device, connected to the supply device, for obtaining the pressure in the supply device;

[0050] a purge device connected to the supply device and used to purge methanol in the supply device;

[0051] a discharge device connected to the purge device and used to receive and discharge methanol discharged from the purge device;

[0052] The pneumatic device is respectively connected to the supply device, the monitoring device, the purge device and the discharge device, and is used to control the opening and closing of the supply device, the purge device and the discharge device according to the pressure obtained by the monitoring device.

[0053] The marine methanol fuel control system provided in this application can provide methanol fuel with a pressure of 6.5bar to 8.5bar, a maximum flow of 660kg / h, and a filtration accuracy of 10μm for equipment such as high-pressure methanol dual-fuel medium-speed engines, and has nitrogen purging, fuel emergency shut-off, and release functions from the control system to the main engine. At the same time, the pneumatic device can control the valves in the supply device, monitoring device and purge device to realize internal control of the system and complete related functions.

[0054] In some embodiments, see Figure 3 The supply device may be a supply pipeline 32, which includes a fuel manual shut-off valve 1, a fuel filter 2, a first supply shut-off valve 3, a pneumatic relief valve 4, a second supply shut-off valve 5 and a pressure regulating valve 6 connected in sequence, and the pressure regulating valve 6 is connected to the engine through a pipeline;

[0055] The monitoring device includes a first pressure transmitter 24, a second pressure transmitter 26 and a third pressure transmitter 27;

[0056] The first pressure transmitter 24 is connected between the fuel manual shut-off valve 1 and the first supply shut-off valve 3 and is used to monitor the initial pressure in the supply device;

[0057] The second pressure transmitter 26 is connected between the first supply stop valve 3 and the second supply stop valve 5 to monitor the pressure difference of the fuel filter 2;

[0058] The third pressure transmitter 27 is connected between the pressure regulating valve 6 and the engine, and is used to monitor the pressure entering the engine.

[0059] The first pressure transmitter 24 and the second pressure transmitter 26 are also used to monitor internal leakage of the first supply stop valve 3 , the pneumatic relief valve 4 and the second supply stop valve 5 of the supply system.

[0060] Supply pipeline 32 has a supply inlet C1 at one end, connected to the outlet of the methanol fuel control system. It also has a supply outlet C2 at the other end, connected to the methanol engine. When the marine methanol fuel control system is operating, the first pressure transmitter 24 monitors the initial pressure in the supply device. Once the operating requirements are met, a fuel leak test is automatically executed. The first and second pressure transmitters 24 and 26 monitor for fuel leaks during the leak test. If the test passes, methanol fuel is regulated to the second supply shut-off valve 5.

[0061] In some embodiments, a pressure gauge 25 is further provided downstream of the fuel filter 2 for directly observing whether the pressure of the supply device is abnormal.

[0062] In some embodiments, the pneumatic device may be a pneumatic circuit 35, which uses compressed air as the power for transmitting signals and executing the mechanism. The pneumatic circuit 35 includes a compressed air shut-off valve 16, a pneumatic two-way valve 17, a first solenoid valve 18, a second solenoid valve 19, and a third solenoid valve 20. The compressed air shut-off valve 16 and the pneumatic two-way valve 17 are connected in series, and the first solenoid valve 18, the second solenoid valve 19, and the third solenoid valve 20 are respectively connected to the pneumatic two-way valve 17.

[0063] The first solenoid valve 18 is connected to the first supply stop valve 3 and is used to control the opening and closing of the first supply stop valve 3;

[0064] The second solenoid valve 19 is connected to the pneumatic relief valve 4 and is used to control the opening and closing of the pneumatic relief valve 4;

[0065] The third solenoid valve 20 is connected to the second supply stop valve 5 and is used to control the opening and closing of the second supply stop valve 5;

[0066] The pneumatic two-way connection 17 is connected to the pressure regulating valve 6 and is used to control the pressure regulating valve 6 to adjust the pressure in the supply device.

[0067] Based on the above embodiments, see Figure 4All cables in the supply device, monitoring device, purge device, discharge device and pneumatic device are collected in the junction box 39, and then connected to the control box 40 arranged in the safe area. The control box 40 contains the necessary safety modules, PLC and display screen, etc., which are used to display the pressure and temperature signals obtained by the monitoring device, and then control the pneumatic device to open and close the valves in the supply device, purge device and discharge device according to the pressure and temperature signals.

[0068] In some embodiments, the purge device may be a purge pipeline 33 comprising a purge manual stop valve 8, a purge filter 9, a first purge stop valve 10, a purge relief valve 11, and a purge relief check valve 14 connected in sequence;

[0069] A bypass pipeline is connected between the first purge stop valve 10 and the purge relief valve 11, and the other end of the bypass pipeline is connected to the supply device;

[0070] The purge and relief check valve 14 is connected to the relief device.

[0071] In some embodiments, the purge line 33 further includes a fourth pressure transmitter 29 for monitoring whether the pressure of the nitrogen gas used for purge in the purge line 33 is normal.

[0072] In some embodiments, the pneumatic pipeline 35 further includes a fifth pressure transmitter 35 for monitoring whether the compressed air pressure in the pneumatic pipeline 35 is normal.

[0073] In some embodiments, the bypass line includes a second purge stop valve 12 and a purge stop check valve 13, wherein the second purge stop valve 12 is connected to the first purge stop valve 10 and the purge relief valve 11, respectively, and the purge stop check valve 13 is connected to the second supply stop valve 5 and the pressure regulating valve 6, respectively;

[0074] The pneumatic device includes a fourth solenoid valve 21 , which is connected to the second purge stop valve 12 and is used to control the opening and closing of the second purge stop valve 12 .

[0075] In some embodiments, the methanol fuel control system further includes a recovery device, see Figure 2 The recovery device is connected to the discharge device and is used to receive the methanol discharged from the discharge device and recover the methanol to the storage tank.

[0076] In some embodiments, the recovery device includes a reflux shut-off valve 7 , and the discharge device is connected to a downstream pipeline of the reflux shut-off valve 7 ;

[0077] The pneumatic device includes a fifth solenoid valve 22 , which is connected to the reflux cut-off valve 7 and is used to control the switch of the reflux cut-off valve 7 .

[0078] In some embodiments, the supply device further includes a fuel filter 2, which is disposed between the manual fuel shut-off valve 1 and the first supply shut-off valve 3, and is connected to the manual fuel shut-off valve 1 and the first supply shut-off valve 3 respectively;

[0079] The monitoring device further includes a pressure gauge 25 , which is connected to the fuel filter 2 .

[0080] In some embodiments, the supply device further includes a temperature transmitter 28 , which is connected between the pressure regulating valve 6 and the engine to monitor the temperature of the methanol entering the engine.

[0081] In some embodiments, the methanol fuel regulating system further includes a liquid collecting device, which covers the areas where the supply device, the purge device, and the discharge device are located.

[0082] In some embodiments, the liquid collecting device includes a residual discharge pipeline 37 , and a manual residual discharge valve 23 is provided on the residual discharge pipeline 37 .

[0083] In some embodiments, the monitoring device includes a drain valve level gauge 31 , which is connected to the manual drain valve 23 and is used to monitor the liquid level in the drain pipeline 37 .

[0084] The following further describes the marine methanol fuel control system in the embodiment of the present application in combination with specific operating methods.

[0085] Example 1

[0086] See also Figure 4 First, the methanol in the supply system enters the fuel control system from the supply inlet C1, passes through the fuel manual shut-off valve 1, the fuel filter 2, the first supply shut-off valve 3, the pneumatic relief valve 4, the second supply shut-off valve 5, and the pressure regulating valve 6 to the supply outlet C2, and is supplied to the methanol dual-fuel engine.

[0087] When methanol is supplied, when the control box 40 receives the engine supply preparation signal, the fuel control system automatically executes the fuel leakage test procedure. The second pressure transmitter 26 is responsible for monitoring whether there is fuel leakage during the leakage test. After the test passes, the methanol fuel is regulated to the second supply shut-off valve 5.

[0088] After the pressure of the first pressure transmitter 24 meets the requirement and the control box 40 receives the supply permission signal, the first solenoid valve 18, the second solenoid valve 19 and the third solenoid valve 20 are energized to control the first supply stop valve 3 and the second supply stop valve 5 to open, the pneumatic relief valve 4 to close, and the pressure regulating valve 6 automatically opens to an appropriate degree according to the received 4-20mA. The third pressure transmitter 27 and the temperature transmitter 28 monitor the pressure and temperature of the methanol fuel after the pressure regulating valve to meet the pressure and flow requirements of the engine.

[0089] The difference between the first pressure transmitter 24 and the second pressure transmitter 26 is also used to monitor the pressure loss of the filter element 2. When the difference exceeds the system alarm value, the control box 40 automatically sends an alarm signal to remind the user to replace the filter element in time.

[0090] When control box 40 receives a signal to stop methanol supply, first, second, and third solenoid valves 18, 19, and 20 lose power, first and second supply shutoff valves 3, 5 reset and close, pneumatic relief valve 4 resets and opens, and pressure regulating valve 6 closes. At this point, methanol is normally supplied to first supply shutoff valve 3 of the control system, and first pressure transmitter 24 can monitor system pressure normally. The control system is in standby mode.

[0091] After the supply is stopped, the methanol fuel between the first and second supply shutoff valves 3 and 5 is released by gravity through the pneumatic relief valve 4 and the relief check valve 15 into the reflux line 34, and then through the reflux outlet C5 to the residual liquid collection tank. To prevent methanol in the relief line 36 from flowing back into the nitrogen line 33, a purge check valve 14 is installed downstream of the purge valve 11.

[0092] When control box 40 receives an emergency stop signal, such as a "fuel trip" signal caused by ventilation failure or methanol leakage, power is removed from first, second, and third solenoid valves 18, 19, and 20. First and second supply shutoff valves 3 and 5 return to their original positions, pneumatic relief valve 4 returns to its original position, and pressure regulating valve 6 closes. At this point, there is no pressure in control system supply line 32, and control box 40 automatically initiates a purge sequence.

[0093] When the control box 40 receives the purge signal, the control system automatically executes the inert gas purge program, and nitrogen enters the purge pipeline 33 from the purge inlet C3, passes through the manual stop valve 8, the purge filter 9, the first purge stop valve 10, the second purge stop valve 12, and the purge stop check valve 13 into the downstream of the second supply stop valve 5, and purges the methanol from the downstream of the second supply stop valve 5 to the engine.

[0094] During purging, fourth solenoid valve 21 is energized, opening first and second purge shutoff valves 10 and 12, closing purge relief valve 11, and opening pressure regulating valve 6. Methanol supplied downstream of shutoff valve 5 to the engine enters reflux line 34 through reflux inlet C4. Solenoid valve 22 is energized, opening reflux shutoff valve 7. The purged methanol then flows through reflux outlet C5 to the residual liquid collection tank.

[0095] A liquid collection pan 38 is installed below the supply line 32, purge line 33, return line 34, and drain line 36. In the event of a methanol fuel leak, the released methanol flows from the manual drain valve 23 through drain port C7 of drain line 37 to the residual liquid collection tank. When the drain valve level switch 31 detects a methanol leak, the system automatically issues a leak alarm.

[0096] The above is a detailed introduction to a marine methanol fuel control system and method provided in the embodiments of the present application. Specific examples are used in this application to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the technical solutions and core ideas of the present application. Ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some of the technical features therein with equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A marine methanol fuel control system, characterized in that: include: a supply device, the supply device being used to output methanol to the engine; a monitoring device connected to the supply device and configured to obtain the pressure in the supply device; a purge device connected to the supply device and used to purge methanol in the supply device; a discharge device connected to the purge device and configured to receive and discharge methanol discharged from the purge device; A pneumatic device is connected to the supply device, the monitoring device, the purge device and the discharge device respectively, and is used to control the opening and closing of the supply device, the purge device and the discharge device respectively according to the pressure obtained by the monitoring device.

2. A marine methanol fuel control system according to claim 1, characterized in that: The supply device comprises a fuel manual shut-off valve (1), a fuel filter (2), a first supply shut-off valve (3), a pneumatic relief valve (4), a second supply shut-off valve (5) and a pressure regulating valve (6) which are connected in sequence, and the pressure regulating valve (6) is connected to the engine via a pipeline; The monitoring device includes a first pressure transmitter (24), a second pressure transmitter (26) and a third pressure transmitter (27); The first pressure transmitter (24) is connected between the fuel manual shut-off valve (1) and the first supply shut-off valve (3) and is used to monitor the initial pressure in the supply device; The second pressure transmitter (26) is connected between the first supply stop valve (3) and the second supply stop valve (5) and is used to monitor the pressure difference of the fuel filter (2); The third pressure transmitter (27) is connected between the pressure regulating valve (6) and the engine, and is used to monitor the pressure entering the engine.

3. A marine methanol fuel control system according to claim 2, characterized in that: The pneumatic device comprises a compressed air shut-off valve (16), a pneumatic two-way valve (17), a first solenoid valve (18), a second solenoid valve (19) and a third solenoid valve (20), wherein the compressed air shut-off valve (16) and the pneumatic two-way valve (17) are connected in series, and the first solenoid valve (18), the second solenoid valve (19) and the third solenoid valve (20) are respectively connected to the pneumatic two-way valve (17); The first solenoid valve (18) is connected to the first supply stop valve (3) and is used to control the opening and closing of the first supply stop valve (3); The second solenoid valve (19) is connected to the pneumatic relief valve (4) and is used to control the opening and closing of the pneumatic relief valve (4); The third solenoid valve (20) is connected to the second supply stop valve (5) and is used to control the opening and closing of the second supply stop valve (5); The pneumatic two-way connection (17) is connected to the pressure regulating valve (6) and is used to control the pressure regulating valve (6) to adjust the pressure in the supply device.

4. A marine methanol fuel control system according to claim 2, characterized in that: The purge device comprises a purge manual stop valve (8), a purge filter (9), a first purge stop valve (10), a purge relief valve (11), and a purge relief check valve (14) which are connected in sequence; A bypass pipeline is connected between the first purge stop valve (10) and the purge relief valve (11), and the other end of the bypass pipeline is connected to the supply device; The purge and relief check valve (14) is connected to the discharge device.

5. A marine methanol fuel control system according to claim 4, characterized in that: The bypass pipeline comprises a second purge stop valve (12) and a purge stop check valve (13), wherein the second purge stop valve (12) is connected to the first purge stop valve (10) and the purge relief valve (11) respectively, and the purge stop check valve (13) is connected to the second supply stop valve (5) and the pressure regulating valve (6) respectively; The pneumatic device comprises a fourth solenoid valve (21), which is connected to the second purge stop valve (12) and is used to control the opening and closing of the second purge stop valve (12).

6. A marine methanol fuel control system according to claim 1, characterized in that: It also includes a recovery device, which is connected to the discharge device and is used to receive the methanol discharged by the discharge device and recover the methanol to a storage tank.

7. A marine methanol fuel control system according to claim 6, characterized in that: The recovery device includes a reflux cut-off valve (7), and the discharge device is connected to a downstream pipeline of the reflux cut-off valve (7); The pneumatic device comprises a fifth solenoid valve (22), which is connected to the reflux cut-off valve (7) and is used to control the switch of the reflux cut-off valve (7).

8. A marine methanol fuel control system according to claim 2, characterized in that: The monitoring device further comprises a pressure gauge (25), and the pressure gauge (25) is connected to the fuel filter (2).

9. A marine methanol fuel control system according to claim 2, characterized in that: The supply device further comprises a temperature transmitter (28), which is connected between the pressure regulating valve (6) and the engine and is used to monitor the temperature of the methanol entering the engine.

10. A marine methanol fuel control system according to claim 1, characterized in that: It also includes a liquid collecting device, which covers the area where the supply device, the purge device and the discharge device are located.

11. A marine methanol fuel control system according to claim 10, characterized in that: The liquid collecting device comprises a residual discharge pipeline (37), and a manual residual discharge valve (23) is provided on the residual discharge pipeline (37).

12. A marine methanol fuel control system according to claim 11, characterized in that: The monitoring device comprises a residual valve liquid level meter (31), which is connected to the manual residual valve (23) and is used to monitor the liquid level in the residual pipeline (37).

Images