A marine methanol fuel regulation system and method

Abstract

The application provides a marine methanol fuel regulating system and method. The marine methanol fuel regulating system comprises a supply device for outputting methanol to an engine, a monitoring device connected with the supply device for acquiring pressure in the supply device, a purging device connected with the supply device for purging methanol in the supply device, a bleeder connected with the purging device for receiving and bleeding methanol discharged from the purging device, and a pneumatic device connected with the supply device, the monitoring device, the purging device and the bleeder respectively for controlling opening and closing of the supply device, the purging device and the bleeder according to the pressure acquired by the monitoring device. The marine methanol fuel regulating system provided by the application can provide methanol fuel with appropriate pressure and flow for high-pressure methanol dual-fuel medium-speed engine and other equipment, and the pneumatic device can realize internal control of the system and complete relevant functions.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of ship navigation technology, and particularly relates to a methanol fuel control system and method for ships. BACKGROUND

[0002] Methanol as a new type of ship alternative fuel has received more and more widespread attention, and the research and development and promotion of the corresponding methanol engine for ships are also steadily progressing. After nearly ten years of continuous efforts by major engine manufacturers, the development of the methanol engine for ships has achieved a leap from nothing to something, from a single technical route to multiple technical routes in parallel.

[0003] The current high-pressure methanol dual-fuel medium-speed engine and other equipment need a matched methanol fuel control system to provide methanol fuel with appropriate pressure and flow. The existing methanol fuel control system is designed based on a specific required engine and does not have a backflow line and further blowdown backflow collection function, and cannot realize emergency stop, which is prone to danger in actual operation. SUMMARY

[0004] The application provides a methanol fuel control system and method for ships, aiming to solve the problem that the existing methanol fuel control system for ships does not have a blowdown backflow collection function.

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

[0006] A supply device for outputting methanol to an engine;

[0007] A monitoring device connected with the supply device for acquiring pressure in the supply device;

[0008] A purging device connected with the supply device for purging methanol in the supply device;

[0009] A blowdown device connected with the purging device for receiving and blowdown methanol discharged from the purging device;

[0010] A pneumatic device connected with the supply device, the monitoring device, the purging device and the blowdown device respectively, for controlling opening and closing of the supply device, the purging device and the blowdown device according to the pressure acquired by the monitoring device.

[0011] In some embodiments, the supply device comprises a fuel manual shut-off valve, a fuel filter, a first supply shut-off valve, a pneumatic blowdown valve, a second supply shut-off valve and a pressure regulating valve connected in sequence, and the pressure regulating valve is connected with the engine through a pipeline;

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

[0013] The first pressure transmitter is connected between the fuel manual cut-off valve and the first supply cut-off valve, for monitoring the initial pressure in the supply device;

[0014] The second pressure transmitter is connected between the first supply cut-off valve and the second supply cut-off valve, for monitoring the pressure difference of the fuel filter;

[0015] The first pressure transmitter and the second pressure transmitter are connected through a leakage test program, for monitoring the internal leakage of the first supply cut-off valve, the pneumatic relief valve and the second supply cut-off valve.

[0016] The third pressure transmitter is connected between the pressure regulating valve and the engine, for monitoring the pressure entering the engine.

[0017] In some embodiments, the pneumatic device comprises a compressed air cut-off valve, a pneumatic two-way joint, a first electromagnetic valve, a second electromagnetic valve and a third electromagnetic valve, wherein the compressed air cut-off valve and the pneumatic two-way joint are connected in series, and the first electromagnetic valve, the second electromagnetic valve and the third electromagnetic valve are respectively connected with the pneumatic two-way joint;

[0018] The first electromagnetic valve is connected with the first supply cut-off valve, for controlling the opening and closing of the first supply cut-off valve;

[0019] The second electromagnetic valve is connected with the pneumatic relief valve, for controlling the opening and closing of the pneumatic relief valve;

[0020] The third electromagnetic valve is connected with the second supply cut-off valve, for controlling the opening and closing of the second supply cut-off valve;

[0021] The pneumatic two-way joint is connected with the pressure regulating valve, for controlling the pressure regulation of the pressure regulating valve in the supply device.

[0022] In some embodiments, the purge device comprises a purge manual cut-off valve, a purge filter, a first purge cut-off valve, a purge relief valve and a purge relief check valve connected in sequence;

[0023] A bypass pipeline is connected between the first purge cut-off valve and the purge relief valve, and the other end of the bypass pipeline is connected with the supply device;

[0024] The purge relief check valve is connected with the relief device.

[0025] In some embodiments, the bypass pipeline comprises a second purge stop valve and a purge stop check valve, wherein the second purge stop valve is connected with the first purge stop valve and the purge bleed valve respectively, and the purge stop check valve is connected with the second supply stop valve and the pressure regulating valve respectively.

[0026] The pneumatic device comprises a fourth electromagnetic valve connected with the second purge stop valve for controlling the opening and closing of the second purge stop valve.

[0027] In some embodiments, a recovery device is further included, which is connected with the bleed device for receiving the methanol discharged from the bleed device and recovering the methanol to a storage tank.

[0028] In some embodiments, the recovery device comprises a return stop valve, and the bleed device is connected with a downstream pipeline of the return stop valve.

[0029] The pneumatic device comprises a fifth electromagnetic valve connected with the return stop valve for controlling the opening and closing of the return stop valve.

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

[0031] In some embodiments, the supply device further comprises a temperature transmitter connected between the pressure regulating valve and the engine for monitoring the temperature of the methanol entering the engine.

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

[0033] In some embodiments, the liquid collecting device comprises a residual discharge pipeline provided with a manual residual discharge valve.

[0034] In some embodiments, the monitoring device comprises a residual discharge valve liquid level meter connected with the manual residual discharge valve for monitoring the liquid level in the residual discharge pipeline.

[0035] The second embodiment of the present application provides a marine methanol fuel regulating method, which adopts the marine methanol fuel regulating system in any of the above embodiments, comprising:

[0036] Starting the supply device to output methanol to the engine;

[0037] Obtaining the pressure in the supply device through the monitoring device, and adjusting the flow of the methanol output to the engine through the pneumatic device;

[0038] purging the methanol not used by the engine by a purging device, and discharging the exhaust by a discharge device.

[0039] In some embodiments, the step of purging the methanol not used by the engine and discharging the exhaust further comprises:

[0040] closing the first supply stop valve and the second supply stop valve to stop supplying the methanol;

[0041] opening the pneumatic discharge valve and the purging check valve to discharge the methanol between the first supply stop valve and the second supply stop valve by the discharge device.

[0042] In some embodiments, the step of purging the methanol not used by the engine and discharging the exhaust further comprises:

[0043] closing the first supply stop valve and the second supply stop valve to stop supplying the methanol;

[0044] opening the manual stop valve, the first purging stop valve, the second purging stop valve and the purging check valve to discharge the methanol between the stop valves and the engine by the discharge device.

[0045] The application provides a marine methanol fuel control system, comprising: a supply device, the supply device being configured to output methanol to an engine; a monitoring device, the monitoring device being connected to the supply device and configured to obtain pressure in the supply device; a purging device, the purging device being connected to the supply device and configured to purge the methanol in the supply device; a discharge device, the discharge device being connected to the purging device and configured to receive and discharge the methanol discharged by the purging device; and a pneumatic device, the pneumatic device being connected to the supply device, the monitoring device, the purging device and the discharge device respectively, and configured to control the opening and closing of the supply device, the purging device and the discharge device according to the pressure obtained by the monitoring device. The marine methanol fuel control system provided by the application can provide methanol fuel with appropriate pressure and flow for high-pressure methanol dual-fuel medium-speed engines and other equipment, and has the functions of nitrogen purging of the control system to the main engine, fuel emergency shutdown and purging. Meanwhile, the pneumatic device can control the valves in the supply device, the monitoring device and the purging device, realize internal control of the system and complete the related functions. BRIEF DESCRIPTION OF DRAWINGS

[0046] The technical solutions and other advantages of the application will be apparent from the following detailed description of the application, taken in conjunction with the accompanying drawings.

[0047] Figure 1 A structural principle schematic diagram of a marine methanol fuel control system provided by an embodiment of the application;

[0048] Figure 2 A structural principle schematic diagram of a marine methanol fuel control system provided by another embodiment of the application;

[0049] Figure 3 A schematic diagram of a methanol fuel control system for a ship is provided in an embodiment of the present application;

[0050] Figure 4 A schematic diagram of a methanol fuel control system for a ship is provided in another embodiment of the present application;

[0051] Figure 5 A flowchart of a methanol fuel control method for a ship is provided in an embodiment of the present application.

[0052] Reference signs:

[0053] 1 - fuel manual stop valve, 2 - fuel filter, 3 - first supply stop valve, 4 - pneumatic relief valve, 5 - second supply stop valve, 6 - pressure regulating valve, 7 - return stop valve, 8 - purge manual stop valve, 9 - purge filter, 10 - first purge stop valve, 11 - purge bleeder valve, 12 - second purge stop valve, 13 - purge stop check valve, 14 - purge bleeder check valve, 15 - relief check valve, 16 - compressed air stop valve, 17 - pneumatic two-way joint, 18 - first solenoid valve, 19 - second solenoid valve, 20 - third solenoid valve, 21 - fourth solenoid valve, 22 - fifth solenoid valve, 23 - manual residual 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 - residual valve liquid level meter, 32 - supply pipeline, 33 - purge pipeline, 34 - return pipeline, 35 - pneumatic pipeline, 36 - relief pipeline, 37 - residual pipeline, 38 - liquid collecting pan, 39 - junction box, 40 - control box;

[0054] C1 - supply inlet, C2 - supply outlet, C3 - purge inlet, C4 - return inlet, C5 - return outlet, C6 - compressed air inlet, C7 - residual outlet. DETAILED DESCRIPTION

[0055] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0056] In the description of the application, it is necessary to point out that, unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or indirectly connected through an intermediate medium, or indirectly connected through a pipe or pipeline, or the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. In the description of the application, the meaning of "multiple" is two or more than two, unless otherwise explicitly specified and limited. In addition, the terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features limited by "first", "second" can be explicitly or implicitly included one or more features.

[0057] The following disclosure provides many different embodiments or examples for implementing different structures of the application. In order to simplify the disclosure of the application, the components and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the application.

[0058] The first embodiment of the application provides a marine methanol fuel regulating system, see Figure 1 Comprising:

[0059] The supply device is used for outputting methanol to the engine;

[0060] The monitoring device is connected with the supply device, and is used for acquiring the pressure in the supply device;

[0061] The purge device is connected with the supply device, and is used for purging the methanol in the supply device;

[0062] The relief device is connected with the purge device, and is used for receiving and discharging the methanol discharged by the purge device;

[0063] The pneumatic device is connected with the supply device, the monitoring device, the purge device and the relief device respectively, and is used for controlling the opening and closing of the supply device, the purge device and the relief device according to the pressure acquired by the monitoring device.

[0064] The methanol fuel control system for ships provided by the application can provide 6.5bar-8.5bar pressure, maximum flow 660kg / h, 10μm filtering precision methanol fuel for high-pressure methanol dual-fuel medium-speed engine and other equipment, and has nitrogen purging, fuel emergency shutdown and diffusion functions from the control system to the main engine, and the pneumatic device can control the valves in the supply device, monitoring device and purging device to realize internal control of the system and complete related functions.

[0065] In some embodiments, referring to Figure 3 , the supply device can 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;

[0066] The monitoring device includes a first pressure transmitter 24, a second pressure transmitter 26 and a third pressure transmitter 27;

[0067] 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;

[0068] The second pressure transmitter 26 is connected between the first supply shut-off valve 3 and the second supply shut-off valve 5, and is used to monitor the pressure difference of the fuel filter 2;

[0069] 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.

[0070] The first pressure transmitter 24 and the second pressure transmitter 26 are also used to monitor the internal leakage of the first supply shut-off valve 3, the pneumatic relief valve 4 and the second supply shut-off valve 5 of the supply system.

[0071] One end of the supply pipeline 32 has a supply inlet C1 connected with the outlet of the methanol fuel control system, and the other end has a supply outlet C2 connected with the methanol engine. When the methanol fuel control system for ships is working, the first pressure transmitter 24 monitors the initial pressure in the supply device, and automatically executes the fuel leakage test program after meeting the working requirements. The first pressure transmitter 24 and the second pressure transmitter 26 are responsible for monitoring whether there is fuel leakage during the leakage test, and the methanol fuel is controlled to the second supply shut-off valve 5 after the test is passed.

[0072] In some embodiments, a pressure gauge 25 is further arranged downstream of the fuel filter 2, which is used to directly observe whether the pressure of the supply device is abnormal.

[0073] In some embodiments, the pneumatic device can be a pneumatic pipeline 35, which uses compressed air as the power of transmission signal and execution mechanism, and the pneumatic pipeline 35 comprises a compressed air stop valve 16, a pneumatic two-way joint 17, a first electromagnetic valve 18, a second electromagnetic valve 19 and a third electromagnetic valve 20, wherein the compressed air stop valve 16 and the pneumatic two-way joint 17 are connected in series, and the first electromagnetic valve 18, the second electromagnetic valve 19 and the third electromagnetic valve 20 are connected with the pneumatic two-way joint 17 respectively;

[0074] The first electromagnetic valve 18 is connected with the first supply stop valve 3, and is used for controlling the opening and closing of the first supply stop valve 3.

[0075] The second electromagnetic valve 19 is connected with the pneumatic relief valve 4, and is used for controlling the opening and closing of the pneumatic relief valve 4.

[0076] The third electromagnetic valve 20 is connected with the second supply stop valve 5, and is used for controlling the opening and closing of the second supply stop valve 5.

[0077] The pneumatic two-way joint 17 is connected with the pressure regulating valve 6, and is used for controlling the pressure regulation of the supply device by the pressure regulating valve 6.

[0078] On the basis of the above-mentioned embodiments, referring to Figure 4 , all the cables in the supply device, the monitoring device, the purging device, the relief device and the pneumatic device are gathered to a junction box 39, and then are connected to a control box 40 arranged in a safety area, and the control box 40 contains necessary safety modules, PLC and display screen, etc., which are used for displaying the pressure and temperature signals obtained by the monitoring device, and then controlling the opening and closing of the valves in the supply device, the purging device and the relief device by the pneumatic device according to the pressure and temperature signals.

[0079] In some embodiments, the purging device can be a purging pipeline 33, which comprises a purging manual stop valve 8, a purging filter 9, a first purging stop valve 10, a purging diffuser valve 11 and a purging diffuser check valve 14 connected in sequence.

[0080] A bypass pipeline is connected between the first purging stop valve 10 and the purging diffuser valve 11, and the other end of the bypass pipeline is connected with the supply device.

[0081] The purging diffuser check valve 14 is connected with the relief device.

[0082] In some embodiments, the purging pipeline 33 further comprises a fourth pressure transmitter 29, which is used for monitoring whether the nitrogen pressure for purging in the purging pipeline 33 is normal.

[0083] In some embodiments, the pneumatic pipeline 35 further comprises a fifth pressure transmitter 35, which is used for monitoring whether the compressed air pressure of the pneumatic pipeline 35 is normal.

[0084] In some embodiments, the bypass pipeline comprises a second purge stop valve 12 and a purge check valve 13, wherein the second purge stop valve 12 is connected with the first purge stop valve 10 and the purge vent valve 11 respectively, and the purge check valve 13 is connected with the second supply stop valve 5 and the pressure regulating valve 6 respectively.

[0085] The pneumatic device comprises a fourth electromagnetic valve 21 connected with the second purge stop valve 12 for controlling the opening and closing of the second purge stop valve 12.

[0086] In some embodiments, the methanol fuel regulating system further comprises a recovery device, as shown in Figure 2 The recovery device is connected with the venting device for receiving the methanol discharged from the venting device and recovering the methanol to the storage tank.

[0087] In some embodiments, the recovery device comprises a return stop valve 7, and the venting device is connected with the downstream pipeline of the return stop valve 7.

[0088] The pneumatic device comprises a fifth electromagnetic valve 22 connected with the return stop valve 7 for controlling the opening and closing of the return stop valve 7.

[0089] In some embodiments, the supply device further comprises a fuel filter 2 arranged between the fuel manual stop valve 1 and the first supply stop valve 3 and connected with the fuel manual stop valve 1 and the first supply stop valve 3 respectively.

[0090] The monitoring device further comprises a pressure gauge 25 connected with the fuel filter 2.

[0091] In some embodiments, the supply device further comprises a temperature transmitter 28 connected between the pressure regulating valve 6 and the engine for monitoring the temperature of the methanol entering the engine.

[0092] In some embodiments, the methanol fuel regulating system further comprises a liquid collecting device covering the area where the supply device, the purge device and the venting device are located.

[0093] In some embodiments, the liquid collecting device comprises a residual discharge pipeline 37 provided with a manual residual discharge valve 23.

[0094] In some embodiments, the monitoring device comprises a residual discharge valve liquid level meter 31 connected with the manual residual discharge valve 23 for monitoring the liquid level in the residual discharge pipeline 37.

[0095] The second embodiment of the present application provides a marine methanol fuel regulating method, which adopts the marine methanol fuel regulating system in any of the above embodiments, as shown in Figure 5 , comprising the following steps:

[0096] S1, start the supply device, output methanol to the engine;

[0097] S2, obtain the pressure in the supply device through the monitoring device, adjust the flow of methanol output to the engine through the pneumatic device;

[0098] S3, purge the methanol not used by the engine through the purge device, and discharge the exhaust through the discharge device.

[0099] In some embodiments, the step of purging the methanol not used by the engine and discharging the exhaust further comprises:

[0100] Close the first supply stop valve 3 and the second supply stop valve 5 to stop supplying methanol;

[0101] Open the pneumatic discharge valve and the purge diffusion check valve 14 to discharge the methanol between the first supply stop valve 3 and the second supply stop valve 5 through the discharge device.

[0102] In some embodiments, the step of purging the methanol not used by the engine and discharging the exhaust further comprises:

[0103] Close the first supply stop valve 3 and the second supply stop valve 5 to stop supplying methanol;

[0104] Open the manual stop valve, the first purge stop valve 10, the second purge stop valve 12 and the purge stop check valve 13 to discharge the methanol between the stop valve and the engine through the discharge device.

[0105] The ship methanol fuel control method in the embodiments of the present application is further described below in combination with specific operation modes.

[0106] Embodiment 1

[0107] Referring to Figure 4 , first, the methanol of the supply system enters the fuel control system from the supply inlet C1, passes through the fuel manual stop valve 1, the fuel filter 2, the first supply stop valve 3, the pneumatic discharge valve 4, the second supply stop valve 5, the pressure regulating valve 6 to the supply outlet C2, and is supplied to the methanol dual-fuel engine.

[0108] When the methanol is supplied, the control box 40 receives the engine supply preparation signal, and the control system automatically executes the fuel leakage test program. The first pressure transmitter 24 and the second pressure transmitter 26 are responsible for monitoring whether there is fuel leakage during the leakage test. After the test is passed, the methanol fuel is controlled to the second supply stop valve 5.

[0109] When the first pressure transmitter 24 pressure meets the requirements, and the control box 40 receives the permission to supply signal, the first solenoid valve 18, the second solenoid valve 19 and the third solenoid valve 20 are powered on, the first supply stop valve 3 and the second supply stop valve 5 are controlled to open, the pneumatic relief valve 4 is closed, and the pressure regulating valve 6 is automatically opened to a suitable opening 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 6 to meet the pressure and flow requirements of the engine.

[0110] 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 2 cartridge. 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 cartridge in time.

[0111] When the control box 40 receives a stop supplying methanol signal, the first solenoid valve 18, the second solenoid valve 19 and the third solenoid valve 20 are powered off, the first supply stop valve 3 and the second supply stop valve 5 are reset to close, the pneumatic relief valve 4 is reset to open, and the pressure regulating valve 6 is closed. At this time, the methanol is normally supplied to the first supply stop valve 3, and the first pressure transmitter 24 can normally monitor the system pressure, and the control system is in standby state.

[0112] After stopping the supply, the methanol fuel between the first supply stop valve 3 and the second supply stop valve 5 is discharged from the pneumatic relief valve 4, the relief check valve 15 to the return line 34 by gravity, and then to the residual liquid collection tank through the return outlet C5. In order to prevent the methanol in the discharge line 36 from flowing back to the nitrogen line 33, a purge diffusion check valve 14 is arranged downstream of the purge diffusion valve 11.

[0113] When the control box 40 receives an emergency stop signal, such as a "fuel trip" signal caused by ventilation failure or methanol leakage, the first solenoid valve 18, the second solenoid valve 19 and the third solenoid valve 20 are powered off, the first supply stop valve 3 and the second supply stop valve 5 are reset to close, the pneumatic relief valve 4 is reset to open, and the pressure regulating valve 6 is closed. At this time, there is no pressure in the supply line 32, and the control box 40 automatically executes the purge program.

[0114] When the control box 40 receives a purge signal, the control system automatically executes the inert gas purge program. Nitrogen enters the purge line 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, the purge stop check valve 13, and then enters the downstream of the second supply stop valve 5 to purge the methanol downstream of the second supply stop valve 5 to the engine.

[0115] When purging, the fourth solenoid valve 21 is powered, the first purging stop valve 10 and the second purging stop valve 12 are opened, the purging dispersion valve 11 is closed, and the pressure regulating valve 6 is opened. The methanol downstream of the supply stop valve 5 to the engine enters the reflux pipeline 34 from the reflux inlet C4, the electromagnetic valve 22 is powered, and the reflux stop valve 7 is opened, and the purging methanol is discharged to the residual liquid collection tank through the reflux outlet C5.

[0116] The supply pipeline 32, the purging pipeline 33, the reflux pipeline 34, and the discharge pipeline 36 are provided below with a liquid collecting pan 38, when methanol fuel leakage occurs, the discharged methanol flows to the residual liquid collection tank from the manual residual discharge valve 23 through the residual discharge outlet C7 of the residual discharge pipeline 37. The residual valve liquid level switch 31 monitors the methanol leakage signal, and the system automatically sends a leakage alarm signal.

[0117] The above describes in detail the marine methanol fuel regulating system and method provided by the embodiments of the present application. The principles and implementation manners of the present application are described by applying specific examples. The above embodiment descriptions are only used to help understand the technical solutions and core ideas of the present application. Those skilled in the art should understand that the technical solutions recorded in the above embodiments can be modified or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A marine methanol fuel regulation system, characterized in that, include: A supply device for supplying methanol to an engine; the supply device includes a manual fuel shut-off valve (1), a fuel filter (2), a first supply shut-off valve (3), a pneumatic vent valve (4), a second supply shut-off valve (5), and a pressure regulating valve (6) connected in sequence, the pressure regulating valve (6) being connected to the engine via a pipeline; A monitoring device is connected to the supply device and is used to acquire the pressure in the supply device. 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 shut-off valve (3) and the second supply shut-off 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. A purging device is connected to the supply device and is used to purge methanol in the supply device. The purging device includes a manual purging shut-off valve (8), a purging filter (9), a first purging shut-off valve (10), a purging vent valve (11), and a purging vent check valve (14) connected in sequence. A bypass pipeline is connected between the first purging shut-off valve (10) and the purging vent valve (11), and the other end of the bypass pipeline is connected to the supply device. The purging vent check valve (14) is connected to the venting device. A discharge device, connected to the purging device, is used to receive and discharge methanol discharged by the purging device; A pneumatic device is connected to the supply device, the monitoring device, the purging device, and the venting device respectively, and is used to control the opening and closing of the supply device, the purging device, and the venting device according to the pressure obtained by the monitoring device; the pneumatic device includes a compressed air shut-off valve (16), a pneumatic double-unit (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 double-unit (17) are connected in series, and the first solenoid valve (18), the second solenoid valve (19), and the third solenoid valve (20) is connected to the pneumatic double unit (17) respectively; wherein, the first solenoid valve (18) is connected to the first supply shut-off valve (3) and is used to control the opening and closing of the first supply shut-off 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 shut-off valve (5) and is used to control the opening and closing of the second supply shut-off valve (5); the pneumatic double unit (17) is connected to the pressure regulating valve (6) and is used to control the pressure regulating valve (6) to regulate the pressure in the supply device.

2. The marine methanol fuel regulation system according to claim 1, characterized in that, The bypass pipeline includes a second purge shut-off valve (12) and a purge shut-off check valve (13), wherein the second purge shut-off valve (12) is connected to the first purge shut-off valve (10) and the purge vent valve (11) respectively, and the purge shut-off check valve (13) is connected to the second supply shut-off valve (5) and the pressure regulating valve (6) respectively. The pneumatic device includes a fourth solenoid valve (21), which is connected to the second purge shut-off valve (12) and is used to control the opening and closing of the second purge shut-off valve (12).

3. The marine methanol fuel regulation system according to claim 1, characterized in that, It also includes a recovery device connected to the discharge device for receiving methanol discharged by the discharge device and recovering the methanol to a storage tank.

4. A marine methanol fuel regulation system according to claim 3, characterized in that, The recovery device includes a backflow shut-off valve (7), and the discharge device is connected to the downstream pipeline of the backflow shut-off valve (7); The pneumatic device includes a fifth solenoid valve (22), which is connected to the return shut-off valve (7) and is used to control the opening and closing of the return shut-off valve (7).

5. A marine methanol fuel regulation system according to claim 1, characterized in that, The monitoring device also includes a pressure gauge (25) connected to the fuel filter (2).

6. A marine methanol fuel regulation system according to claim 1, characterized in that, The supply device also includes a temperature transmitter (28), which is connected between the pressure regulating valve (6) and the engine to monitor the temperature of methanol entering the engine.

7. A marine methanol fuel regulation system according to claim 1, characterized in that, It also includes a liquid collection device that covers the area where the supply device, the purging device and the discharge device are located.

8. A marine methanol fuel regulation system according to claim 7, characterized in that, The liquid collection device includes a residual discharge pipeline (37), and a manual residual discharge valve (23) is provided on the residual discharge pipeline (37).

9. A marine methanol fuel regulation system according to claim 8, characterized in that, The monitoring device includes a discharge valve level gauge (31), which is connected to the manual discharge valve (23) and is used to monitor the liquid level in the discharge pipeline (37).

10. A method for regulating marine methanol fuel, employing the marine methanol fuel regulation system as described in any one of claims 1 to 9, characterized in that, include: Start the supply unit to output methanol to the engine; The pressure in the supply device is obtained by a monitoring device, and the flow rate of methanol output to the engine is adjusted by a pneumatic device. Methanol not used by the engine is purged by a purging device and then discharged through a venting device.

11. A method for regulating marine methanol fuel according to claim 10, characterized in that, The step of purging unused methanol using a purging device and releasing it via a venting device further includes: Close the first supply shut-off valve (3) and the second supply shut-off valve (5) to stop the supply of methanol; Open the pneumatic vent valve and the purge and release check valve (14) to discharge the methanol between the first supply shut-off valve (3) and the second supply shut-off valve (5) through the vent device.

12. A method for regulating marine methanol fuel according to claim 10, characterized in that, The steps of purging unused methanol from the engine and releasing it further include: Close the first supply shut-off valve (3) and the second supply shut-off valve (5) to stop the supply of methanol; Open the manual shut-off valve, the first purge shut-off valve (10), the second purge shut-off valve (12), and the purge shut-off check valve (13) to discharge the methanol between the shut-off valve and the engine through the venting device.

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