Methanol fuel supply system

Abstract

The utility model discloses a methanol fuel supply system. The methanol fuel supply system comprises a methanol pressure control unit, a methanol temperature control unit and a methanol purging and emptying unit, the methanol pressure control unit comprises a mixed degassing tank, and a methanol pump, a pressure control valve, a pressure difference indicator and a pressure transmitter which are connected in series with the mixed degassing tank through a methanol pipeline; the methanol temperature control unit realizes accurate temperature control in a wide temperature range through series-parallel connection of heat exchangers; the methanol purging and emptying unit realizes automatic purging in a pipeline through cooperation among an air source, a pneumatic valve and a pneumatic diaphragm pump, and when the duplex filter breaks down, the filter can be replaced without shutdown by manually opening a normally closed ball valve. According to the methanol supply system, the two methanol pumps are connected in series, the two heat exchangers are connected in series and in parallel, and the whole system can achieve stable pressure output through cooperation of the two stages of methanol pumps and the mixed degassing tank under the working condition of large flow change.

Description

Technical Field

[0001] This utility model relates to a wide-area adjustable temperature supply system, and more particularly to a methanol fuel supply system, belonging to the field of marine fuel systems. Background Technology

[0002] The shipping industry handles over 85% of global trade and transportation, emitting over 1 billion tons of greenhouse gases annually. To achieve greenhouse gas emission reduction targets for maritime transport, the International Maritime Organization (IMO) released its Initial Strategy for Maritime Greenhouse Gas Reduction in 2018, making the large-scale development and deployment of carbon-neutral fuels a core part of its long-term strategy. In recent years, with the accelerated pace of global maritime greenhouse gas emission reduction, green ships have become the mainstream development direction for future shipping.

[0003] Compared to traditional heavy fuel oil, methanol has a lower sulfur content and carbon emissions. As an alternative energy source, methanol offers numerous advantages, including low pollution, high octane rating, and relatively low production and transportation costs. However, methanol's physical and chemical properties, such as its low flash point and corrosiveness, necessitate a high degree of safety and reliability in fuel delivery and supply systems. Furthermore, to achieve efficient application of methanol fuel in the shipping industry, the supply system must be able to accurately control fuel flow, temperature, and pressure to adapt to varying navigation conditions and power demands.

[0004] Currently, the design and implementation of marine methanol fuel control systems face challenges such as fuel compatibility and the limitation of specific routes. For example, Chinese utility model patent CN220487747U discloses "a marine methanol fuel supply system," which uses a methanol thermostat and a methanol booster pump to maintain the required temperature and pressure of the supplied methanol. However, similar systems have the following shortcomings:

[0005] (1) The heat exchange capacity of a single thermostat is limited, and the temperature control range that can be achieved by controlling the flow rate to adjust the methanol temperature in the face of complex and variable scenarios is narrow.

[0006] (2) When a single heat exchanger or two heat exchangers are connected in series to achieve a large heat exchange capacity, the system will immediately lose its temperature control function if one of the heat exchangers fails, which poses a significant safety hazard.

[0007] (3) The system control logic of the first-stage pressurization is simple and the structure is compact, but the requirements for the supply pump are high and the output pressure fluctuates greatly, which can easily cause unstable supply. Utility Model Content

[0008] To address the shortcomings of the aforementioned technologies, this invention provides a methanol fuel supply system that solves the problems of limited adjustable temperature range, large pressure fluctuations, and inability to adapt well to complex and changing environmental conditions in existing methanol supply systems.

[0009] To solve the above technical problems, the technical solution adopted by this utility model is: a methanol fuel supply system, which includes a methanol pressure control unit, a methanol temperature control unit, and a methanol purging and venting unit;

[0010] The methanol pressure control unit includes a mixing and degassing tank and a methanol pump, filter, pneumatic valve, ball valve, pressure control valve, needle valve, differential pressure indicator, pressure transmitter, temperature transmitter and flow transmitter connected in series with the mixing and degassing tank via a methanol pipeline.

[0011] The methanol temperature control unit includes a water glycol pump, heat exchanger, water glycol buffer expansion tank, pneumatic valve, ball valve, temperature control valve, needle valve, check valve, proportional regulating valve, shut-off valve, pressure transmitter, temperature transmitter, and flow transmitter. It achieves precise temperature control over a wide temperature range through the mixed connection of heat exchangers.

[0012] The methanol purging and venting unit includes a pneumatic diaphragm pump, filter, pneumatic valve, ball valve, needle valve, check valve, shut-off valve, and pressure transmitter. Automatic purging of the pipeline is achieved through the cooperation between the air source, pneumatic valve, and pneumatic diaphragm pump. When the dual filter fails, the normally closed ball valve can be manually opened to replace the filter without shutting down the system.

[0013] Preferably, the methanol pressure control unit includes, in series via pipelines, a first pneumatic valve, a liquid coarse filter, a first normally open ball valve, a first methanol pump, a second normally open ball valve, a third heat exchanger, a mixing and degassing tank, a third normally open ball valve, a second methanol pump, a fourth normally open ball valve, a second heat exchanger, a fifth ball valve, a dual filter, a sixth ball valve, a seventh normally open ball valve, a first flow transmitter, an eighth normally open ball valve, and a second pneumatic valve.

[0014] Preferably, the first pneumatic valve is connected to the methanol inlet via a pipeline; the first temperature transmitter is arranged between the first pneumatic valve and the liquid coarse filter via a pipeline; the first differential pressure indicator is connected in parallel to the liquid coarse filter via a pipeline; the first pressure control valve is connected in parallel to the first normally open ball valve, the first methanol pump, and the second normally open ball valve via a pipeline; the first pressure transmitter and the first needle valve are connected in series via a pipeline between the third heat exchanger and the mixing degassing tank; the second temperature transmitter is arranged between the second heat exchanger and the fifth ball valve via a pipeline; and the second differential pressure indicator is connected in parallel to the dual filter via a pipeline.

[0015] Preferably, the second pressure control valve is connected in parallel with the third normally open ball valve, the second methanol pump, the fourth normally open ball valve, the second heat exchanger, the second temperature transmitter, the fifth ball valve, the dual filter, the second differential pressure indicator, and the sixth ball valve via a pipeline; one end of the second pressure control valve is arranged between the sixth ball valve and the second needle valve via a pipeline, and the other end is arranged on the upper part of the mixing and degassing tank via a pipeline; the second pneumatic valve is connected to the methanol outlet via a pipeline.

[0016] Preferably, the methanol temperature control unit includes a second shut-off valve, a ninth normally open ball valve, a water glycol pump, a tenth normally open ball valve, a first heat exchanger, an eleventh ball valve, a first temperature control valve, a second temperature control valve, a first heat exchanger, a third shut-off valve, a third heat exchanger, a first check valve, and a thirteenth ball valve, which are connected in series via pipelines.

[0017] Preferably, the second and fifth shut-off valves are connected to the lower part of the buffer expansion tank via pipelines; the first and thirteenth shut-off valves are connected to the upper part of the buffer expansion tank via pipelines; the first shut-off valve is connected to the water glycol inlet via a pipeline; the fifth shut-off valve is connected to the water glycol outlet via a pipeline; the third temperature transmitter is arranged between the first heat exchanger and the eleventh shut-off valve via a pipeline; one side of the twelfth shut-off valve is arranged between the thirteenth shut-off valve and the buffer expansion tank via a pipeline, and the other side is connected to the first temperature control valve via a pipeline; one side of the fourth shut-off valve is connected to the second temperature control valve via a pipeline, and the other side is arranged between the third shut-off valve and the third heat exchanger via a pipeline.

[0018] Preferably, the methanol temperature control unit further includes a sixth shut-off valve, a proportional regulating valve, a first temperature regulating valve, a fourteenth normally open ball valve, a second flow transmitter, a fifteenth normally open ball valve, and a seventh shut-off valve connected in series via pipelines; the sixth shut-off valve is connected to the cylinder liner water inlet via a pipeline; the seventh shut-off valve is connected to the cylinder liner water outlet via a pipeline; a third pressure transmitter and a third needle valve are arranged in series via pipelines between the sixth shut-off valve and the proportional regulating valve; and a fourth temperature transmitter is arranged via a pipeline between the sixth shut-off valve and the proportional regulating valve.

[0019] Preferably, the methanol purging and venting unit includes an eighth shut-off valve, a gas filter, a third pneumatic valve, a fifth pneumatic valve, a third check valve, and a second heat exchanger connected in series via pipelines; the eighth shut-off valve is connected to a gas source via a pipeline; a fourth pressure transmitter and a fourth needle valve are connected in series via pipelines between the gas filter and the third pneumatic valve; the fourth pneumatic valve and the second check valve are connected in series with one end connected via a pipeline between the third and fifth pneumatic valves, and connected in series with the other end connected via a pipeline between the first temperature transmitter and the first differential pressure indicator.

[0020] Preferably, the methanol purging and venting unit further includes a thirteenth pneumatic valve, a twentieth normally open ball valve, a pneumatic diaphragm pump, a sixth check valve, and a twenty-first normally open ball valve connected in series via pipelines; a ninth shut-off valve and a fourth check valve are connected in series at one end to one side of the dual filter via pipelines, and are connected in series at the other end via pipelines between the thirteenth pneumatic valve and the twentieth normally open ball valve.

[0021] Preferably, one end of the seventh pneumatic valve is connected to the first methanol pump via a pipeline, and the other end is arranged between the twentieth normally open ball valve and the ninth pneumatic valve via a pipeline; one end of the eighth pneumatic valve is connected to the third heat exchanger via a pipeline, and the other end is arranged between the seventh pneumatic valve and the ninth pneumatic valve via a pipeline; one end of the sixth pneumatic valve is arranged between the first differential pressure indicator and the first pressure control valve via a pipeline, and the other end is arranged between the seventh pneumatic valve and the twentieth normally open ball valve via a pipeline; the nineteenth normally open ball valve and the fifth check valve are connected in series and then connected in parallel with the twentieth normally open ball valve, the pneumatic diaphragm pump, the sixth check valve, and the twenty-first normally open ball valve; the twenty-first normally open ball valve is connected to the discharge outlet.

[0022] This invention achieves stable pressure output through a methanol pressure control unit; the methanol temperature control unit achieves precise temperature control over a wide temperature range through the hybrid connection of heat exchangers; the methanol purging and venting unit achieves automatic purging of the pipeline through the cooperation of the air source, pneumatic valve and pneumatic diaphragm pump. When the dual filter fails, the normally closed ball valve can be manually opened to replace the filter without stopping the machine, making it safer and more reliable.

[0023] This invention provides a methanol supply system with a design of two methanol pumps connected in series and two heat exchangers connected in parallel. Under conditions of large flow rate changes, the entire system can achieve a relatively stable pressure output through the cooperation of two-stage methanol pumps and a mixing and degassing tank. Temperature control over a large temperature range can be achieved by switching between the series and parallel connections of the two heat exchangers, thereby enabling the entire system to meet the requirements of more variable environments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall connection of this utility model.

[0025] Figure 2 for Figure 1 A schematic diagram of the connection of the methanol pressure control unit.

[0026] Figure 3 for Figure 1 A schematic diagram of the connection of the methanol temperature control unit.

[0027] Figure 4 for Figure 1 A schematic diagram of the connection of the methanol purging and venting unit.

[0028] In the diagram: 1. Methanol inlet; 2. Methanol outlet; 3. Water-glycol inlet; 4. Water-glycol outlet; 5. Cylinder liner water inlet; 6. Cylinder liner water outlet; 7. Gas source inlet; 8. Vent outlet; 9. Pneumatic valve; 10. Liquid coarse filter; 11. Differential pressure indicator; 12. Mixing and degassing tank; 13. Methanol pump; 14. Dual filter; 15. Pressure control valve; 16. Needle valve; 17. Flow transmitter; 18. Buffer expansion tank; 19. Temperature transmitter; 20. Normally open ball valve; 21. Proportional regulating valve; 22. Heat exchanger; 23. Temperature control valve; 24. Shut-off valve; 25. Pressure transmitter; 26. Normally closed ball valve; 27. Check valve; 28. Pneumatic diaphragm pump. Detailed Implementation

[0029] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0030] like Figure 1 The methanol fuel supply system shown includes a methanol pressure control unit, a methanol temperature control unit, and a methanol purging and venting unit.

[0031] like Figure 2 As shown, the methanol pressure control unit includes, in sequence, a first pneumatic valve, a liquid coarse filter, a first normally open ball valve, a first methanol pump, a second normally open ball valve, a third heat exchanger, a mixing degassing tank, a third normally open ball valve, a second methanol pump, a fourth normally open ball valve, a second heat exchanger, a fifth ball valve, a dual filter, a sixth ball valve, a seventh normally open ball valve, a first flow transmitter, an eighth normally open ball valve, and a second pneumatic valve, all connected in series via pipelines.

[0032] The first pneumatic valve is connected to the methanol inlet via a pipeline; the first temperature transmitter is arranged between the first pneumatic valve and the liquid coarse filter via a pipeline; the first differential pressure indicator is connected in parallel with the liquid coarse filter via a pipeline; the first pressure control valve is connected in parallel with the first normally open ball valve, the first methanol pump, and the second normally open ball valve via a pipeline; the first pressure transmitter and the first needle valve are connected in series via a pipeline between the third heat exchanger and the mixing degassing tank; the second temperature transmitter is arranged between the second heat exchanger and the fifth ball valve via a pipeline; the second differential pressure indicator is connected in parallel with the dual filter via a pipeline.

[0033] The second pressure control valve is connected in parallel with the third normally open ball valve, the second methanol pump, the fourth normally open ball valve, the second heat exchanger, the second temperature transmitter, the fifth ball valve, the dual filter, the second differential pressure indicator, and the sixth ball valve via pipelines; one end of the second pressure control valve is arranged between the sixth ball valve and the second needle valve via a pipeline, and the other end is arranged at the top of the mixing and degassing tank via a pipeline; the second pressure transmitter and the second needle valve are connected in series via pipelines between the seventh normally open ball valve and one end of the second pressure control valve; the second pneumatic valve is connected to the methanol outlet via a pipeline.

[0034] In the methanol pressure control unit, when the pressure signal transmitted by the second pressure transmitter is less than the set value, the second methanol pump increases its frequency; when the pressure signal transmitted by the second pressure transmitter is greater than the set value, the second pressure control valve opens and the second methanol pump decreases its frequency.

[0035] When the pressure signal transmitted by the first pressure transmitter is less than the set value, the first methanol pump increases its frequency; when the pressure signal transmitted by the first pressure transmitter is greater than the set value, the first pressure control valve opens and the first methanol pump decreases its frequency.

[0036] The methanol pressure control unit uses frequency converters for the first and second methanol pumps to handle pressure changes caused by flow variations. The methanol inlet and outlet are controlled by a first and a second pneumatic valve. The mixing and degassing tank reduces pressure fluctuations by changing its volume when system pressure changes. The first and second pressure control valves allow partial methanol recirculation to quickly reduce system pressure when the supply system is overpressured. Pressure signal monitoring and transmission are achieved through a first and a second pressure transmitter. Flow signal monitoring and transmission are achieved through a first flow transmitter. A liquid coarse filter and a dual filter filter impurities carried in the methanol supply to meet the requirements of the fuel valve assembly and engine.

[0037] like Figure 3 As shown, the methanol temperature control unit includes a second shut-off valve, a ninth normally open ball valve, a water glycol pump, a tenth normally open ball valve, a first heat exchanger, an eleventh ball valve, a first temperature control valve, a second temperature control valve, a first heat exchanger, a third shut-off valve, a third heat exchanger, a first check valve, and a thirteenth ball valve, which are connected in series via pipelines.

[0038] The second and fifth shut-off valves are connected to the lower part of the buffer expansion tank via pipelines; the first and thirteenth shut-off valves are connected to the upper part of the buffer expansion tank via pipelines; the first shut-off valve is connected to the water glycol inlet via a pipeline; the fifth shut-off valve is connected to the water glycol outlet via a pipeline; the third temperature transmitter is arranged between the first heat exchanger and the eleventh shut-off valve via a pipeline; one side of the twelfth shut-off valve is arranged between the thirteenth shut-off valve and the buffer expansion tank via a pipeline, and the other side is connected to the first temperature control valve via a pipeline; one side of the fourth shut-off valve is connected to the second temperature control valve via a pipeline, and the other side is arranged between the third shut-off valve and the third heat exchanger via a pipeline.

[0039] The methanol temperature control unit also includes a sixth shut-off valve, a proportional regulating valve, a first temperature regulating valve, a fourteenth normally open ball valve, a second flow transmitter, a fifteenth normally open ball valve, and a seventh shut-off valve connected in series via pipelines; the sixth shut-off valve is connected to the cylinder liner water inlet via a pipeline; the seventh shut-off valve is connected to the cylinder liner water outlet via a pipeline; the third pressure transmitter and the third needle valve are connected in series via pipelines between the sixth shut-off valve and the proportional regulating valve; and the fourth temperature transmitter is connected via a pipeline between the sixth shut-off valve and the proportional regulating valve.

[0040] In the methanol temperature control unit, when the temperature signal transmitted by the first temperature transmitter is greater than the set value, the second temperature control valve fully refluxes, meaning that water glycol does not flow through the second heat exchanger; when the temperature signal transmitted by the first temperature transmitter is less than the set value and the temperature signal transmitted by the second temperature transmitter is less than the set value, the second temperature control valve reduces the reflux opening, meaning that more water glycol flows through the second heat exchanger.

[0041] When the temperature signal transmitted by the second temperature transmitter is less than the set value, the first temperature control valve reduces the reflux opening, meaning more water and ethylene glycol flow through the second temperature control valve; when the signal transmitted by the second temperature transmitter is greater than the set value, the first temperature control valve increases the reflux opening, meaning less water and ethylene glycol flow through the second temperature control valve.

[0042] When the temperature signal transmitted by the fifth temperature transmitter is less than the set value, the proportional control valve increases its opening, which means that the flow rate of the cylinder liner water flowing through the first heat exchanger increases; when the temperature signal transmitted by the fifth temperature transmitter is greater than the set value, the proportional control valve decreases its opening, which means that the flow rate of the cylinder liner water flowing through the first heat exchanger decreases.

[0043] The methanol temperature control unit adjusts the system flow rate to achieve temperature changes caused by variations in ambient temperature and flow rate through a proportional control valve, a first temperature control valve, and a second temperature control valve. The heat supply to the methanol temperature control unit is provided by the sixth and seventh shut-off valves, which control the inflow and outflow of cylinder liner water. The flow rate control of the cylinder liner water is achieved by a proportional control valve. The monitoring and transmission of the cylinder liner water flow rate signal is achieved through a second flow transmitter. The monitoring and transmission of the cylinder liner water temperature signal is achieved through a fourth and fifth temperature transmitter. The monitoring and transmission of the cylinder liner water pressure signal is achieved through a third pressure transmitter.

[0044] The heat exchange medium water glycol in the methanol temperature control unit is controlled by the first and second shut-off valves for its inflow and outflow; the water glycol buffer expansion tank is used to achieve buffer expansion by circulating the water glycol heat exchange medium in the methanol temperature control unit; the control of the water glycol circulation in the methanol temperature control unit is achieved by the fifth shut-off valve and the water glycol circulation pump; the heat exchange of the methanol temperature system is achieved through the first heat exchanger, the second heat exchanger and the third heat exchanger.

[0045] like Figure 4 As shown, the methanol purging and venting unit includes an eighth shut-off valve, a gas filter, a third pneumatic valve, a fifth pneumatic valve, a third check valve, and a second heat exchanger connected in series via pipelines; the eighth shut-off valve is connected to the gas source via a pipeline; a fourth pressure transmitter and a fourth needle valve are connected in series via pipelines between the gas filter and the third pneumatic valve; the fourth pneumatic valve and the second check valve are connected in series with one end connected via a pipeline between the third and fifth pneumatic valves, and connected in series with the other end connected via a pipeline between the first temperature transmitter and the first differential pressure indicator;

[0046] The sixteenth normally closed ball valve and the seventeenth normally closed ball valve are connected in series, with one end arranged between the fourth needle valve and the third pneumatic valve through a pipeline, and the other end connected to one side of the double filter through a pipeline; one end of the eighteenth normally closed ball valve is arranged between the sixteenth normally closed ball valve and the seventeenth normally closed ball valve through a pipeline, and the other end is connected to one side of the double filter through a pipeline.

[0047] The methanol purging and venting unit also includes a thirteenth pneumatic valve, a twentieth normally open ball valve, a pneumatic diaphragm pump, a sixth check valve, and a twenty-first normally open ball valve connected in series via pipelines; a ninth shut-off valve and a fourth check valve are connected in series at one end to one side of the double filter via pipelines, and are connected in series at the other end via pipelines between the thirteenth pneumatic valve and the twentieth normally open ball valve.

[0048] One end of the tenth shut-off valve is connected to one side of the double filter via a pipeline, and the other end is arranged between the ninth shut-off valve and the fourth check valve via a pipeline; one end of the eleventh pneumatic valve is arranged between the second pressure control valve and the mixing degassing tank via a pipeline, and the other end is arranged between the thirteenth pneumatic valve and the twentieth normally open ball valve via a pipeline.

[0049] One end of the twelfth pneumatic valve is connected to the second heat exchanger via a pipe, and the other end is arranged between the eleventh and thirteenth pneumatic valves via a pipe; one end of the tenth pneumatic valve is connected to the second methanol pump via a pipe, and the other end is arranged between the ninth and thirteenth pneumatic valves via a pipe; one end of the ninth pneumatic valve is connected to the lower part of the mixing and degassing tank via a pipe, and the other end is arranged between the twentieth normally open ball valve and the thirteenth pneumatic valve via a pipe.

[0050] One end of the seventh pneumatic valve is connected to the first methanol pump via a pipeline, and the other end is arranged between the twentieth normally open ball valve and the ninth pneumatic valve via a pipeline; one end of the eighth pneumatic valve is connected to the third heat exchanger via a pipeline, and the other end is arranged between the seventh pneumatic valve and the ninth pneumatic valve via a pipeline; one end of the sixth pneumatic valve is arranged between the first differential pressure indicator and the first pressure control valve via a pipeline, and the other end is arranged between the seventh pneumatic valve and the twentieth normally open ball valve via a pipeline; the nineteenth normally open ball valve and the fifth check valve are connected in series and then connected in parallel with the twentieth normally open ball valve, the pneumatic diaphragm pump, the sixth check valve, and the twenty-first normally open ball valve; the twenty-first normally open ball valve is connected to the discharge outlet.

[0051] The methanol purging and venting unit can achieve purging and venting of the liquid coarse filter, the first pressure control valve, the first normally open ball valve, the first methanol pump, the second normally open ball valve, and the third heat exchanger by sequentially opening the third pneumatic valve, the fourth pneumatic valve, the sixth pneumatic valve, the seventh pneumatic valve, the eighth pneumatic valve, and the pneumatic diaphragm pump.

[0052] The pneumatic valves, namely the third, fifth, ninth, tenth, eleventh, twelfth, and thirteenth pneumatic valves and the pneumatic diaphragm pump, can be opened in sequence to purge and vent the mixing degassing tank, the third normally open ball valve, the second methanol pump, the fourth normally open ball valve, the second heat exchanger, and the second pressure control valve.

[0053] The maintenance and purging of the dual filter can be performed manually while the system is operating normally. The eighth shut-off valve, the sixteenth normally closed ball valve, the seventeenth normally closed ball valve, and the ninth normally closed ball valve are opened manually in sequence. The pneumatic diaphragm pump is then turned on, allowing the replacement and maintenance of the dual filter to be carried out without shutting down the system.

[0054] The maintenance and purging of the dual filter can be performed manually while the system is working normally. The eighth shut-off valve, the sixteenth normally closed ball valve, the eighteenth normally closed ball valve, and the tenth normally closed ball valve are opened manually in sequence. The pneumatic diaphragm pump is then turned on, and the replacement and maintenance of the dual filter can be carried out without stopping the system.

[0055] The methanol purging and venting unit achieves automatic purging function through the third, fourth, fifth, sixth, seventh, eighth, ninth, tenth, eleventh and twelfth pneumatic valves.

[0056] The gas source of the methanol purging and venting unit is controlled by the eighth shut-off valve; the methanol purging and venting unit realizes the venting of residual gas and liquid in the system through a pneumatic diaphragm pump; the function of filtering larger particles in the gas source of the methanol purging and venting unit is realized through a gas filter; the purging of the dual filter in the methanol purging and venting unit is realized by the coordinated switching of the sixteenth normally closed ball valve, the seventeenth normally closed ball valve, the eighteenth normally closed ball valve, the ninth shut-off valve, and the tenth shut-off valve.

[0057] The purpose of this invention is to provide a methanol fuel supply system that uses a two-stage pressurization and two heat exchangers in a hybrid configuration to supply methanol stored in a tank at a specific pressure and temperature. This effectively eliminates the shortcomings of traditional methanol supply systems, such as large pressure fluctuations, narrow temperature adaptability, and low automation. The two-stage pressurization design not only enables a stable methanol supply with smaller pressure fluctuations but also effectively reduces the design difficulty of the methanol pump and the requirements for process technology. The hybrid configuration of the two heat exchangers ensures stable methanol supply under conditions of large ambient temperature changes and also provides a sensitive response under conditions of low heat exchange, making the overall system more reliable.

[0058] The above embodiments are not intended to limit the present utility model, nor is the present utility model limited to the examples given above. Any changes, modifications, additions or substitutions made by those skilled in the art within the scope of the technical solution of the present utility model are also within the protection scope of the present utility model.

Claims

1. A methanol fuel supply system, characterized in that: The system includes a methanol pressure control unit, a methanol temperature control unit, and a methanol purging and venting unit; The methanol pressure control unit includes a mixing and degassing tank and a methanol pump, filter, pneumatic valve, ball valve, pressure control valve, needle valve, differential pressure indicator, pressure transmitter, temperature transmitter and flow transmitter connected in series with the mixing and degassing tank via a methanol pipeline. The methanol temperature control unit includes a water glycol pump, a heat exchanger, a water glycol buffer expansion tank, a pneumatic valve, a ball valve, a temperature control valve, a needle valve, a check valve, a proportional regulating valve, a shut-off valve, a pressure transmitter, a temperature transmitter, and a flow transmitter. Precise temperature control over a wide temperature range is achieved through the interconnection of heat exchangers. The methanol purging and venting unit includes a pneumatic diaphragm pump, a filter, a pneumatic valve, a ball valve, a needle valve, a check valve, a shut-off valve, and a pressure transmitter. Automatic purging of the pipeline is achieved through the cooperation between the air source, the pneumatic valve, and the pneumatic diaphragm pump. When the dual filter fails, the normally closed ball valve can be manually opened to replace the filter without shutting down the system.

2. The methanol fuel supply system according to claim 1, characterized in that: The methanol pressure control unit includes, in series via pipelines, a first pneumatic valve, a liquid coarse filter, a first normally open ball valve, a first methanol pump, a second normally open ball valve, a third heat exchanger, a mixing and degassing tank, a third normally open ball valve, a second methanol pump, a fourth normally open ball valve, a second heat exchanger, a fifth ball valve, a dual filter, a sixth ball valve, a seventh normally open ball valve, a first flow transmitter, an eighth normally open ball valve, and a second pneumatic valve.

3. The methanol fuel supply system according to claim 2, characterized in that: The first pneumatic valve is connected to the methanol inlet via a pipeline; the first temperature transmitter is arranged between the first pneumatic valve and the liquid coarse filter via a pipeline; the first differential pressure indicator is connected in parallel to the liquid coarse filter via a pipeline; the first pressure control valve is connected in parallel to the first normally open ball valve, the first methanol pump, and the second normally open ball valve via a pipeline; the first pressure transmitter and the first needle valve are connected in series via a pipeline between the third heat exchanger and the mixing degassing tank; the second temperature transmitter is arranged between the second heat exchanger and the fifth ball valve via a pipeline; and the second differential pressure indicator is connected in parallel to the dual filter via a pipeline.

4. The methanol fuel supply system according to claim 3, characterized in that: The second pressure control valve is connected in parallel with the third normally open ball valve, the second methanol pump, the fourth normally open ball valve, the second heat exchanger, the second temperature transmitter, the fifth ball valve, the dual filter, the second differential pressure indicator, and the sixth ball valve via a pipeline; one end of the second pressure control valve is arranged between the sixth ball valve and the second needle valve via a pipeline, and the other end is arranged at the top of the mixing and degassing tank via a pipeline; the second pneumatic valve is connected to the methanol outlet via a pipeline.

5. The methanol fuel supply system according to claim 1, characterized in that: The methanol temperature control unit includes a second shut-off valve, a ninth normally open ball valve, a water glycol pump, a tenth normally open ball valve, a first heat exchanger, an eleventh ball valve, a first temperature control valve, a second temperature control valve, a first heat exchanger, a third shut-off valve, a third heat exchanger, a first check valve, and a thirteenth ball valve, all connected in series via pipelines.

6. The methanol fuel supply system according to claim 5, characterized in that: The second and fifth shut-off valves are connected to the lower part of the buffer expansion tank via pipelines; the first and thirteenth shut-off valves are connected to the upper part of the buffer expansion tank via pipelines; the first shut-off valve is connected to the water glycol inlet via a pipeline; the fifth shut-off valve is connected to the water glycol outlet via a pipeline; the third temperature transmitter is arranged between the first heat exchanger and the eleventh shut-off valve via a pipeline; one side of the twelfth shut-off valve is arranged between the thirteenth shut-off valve and the buffer expansion tank via a pipeline, and the other side is connected to the first temperature control valve via a pipeline; one side of the fourth shut-off valve is connected to the second temperature control valve via a pipeline, and the other side is arranged between the third shut-off valve and the third heat exchanger via a pipeline.

7. The methanol fuel supply system according to claim 6, characterized in that: The methanol temperature control unit also includes a sixth shut-off valve, a proportional regulating valve, a first temperature regulating valve, a fourteenth normally open ball valve, a second flow transmitter, a fifteenth normally open ball valve, and a seventh shut-off valve connected in series via pipelines; the sixth shut-off valve is connected to the cylinder liner water inlet via a pipeline; the seventh shut-off valve is connected to the cylinder liner water outlet via a pipeline; the third pressure transmitter and the third needle valve are arranged in series via pipelines between the sixth shut-off valve and the proportional regulating valve; and the fourth temperature transmitter is arranged via a pipeline between the sixth shut-off valve and the proportional regulating valve.

8. The methanol fuel supply system according to claim 1, characterized in that: The methanol purging and venting unit includes an eighth shut-off valve, a gas filter, a third pneumatic valve, a fifth pneumatic valve, a third check valve, and a second heat exchanger connected in series via pipelines. The eighth shut-off valve is connected to a gas source via a pipeline. A fourth pressure transmitter and a fourth needle valve are connected in series via pipelines between the gas filter and the third pneumatic valve. The fourth pneumatic valve and the second check valve are connected in series with one end connected via a pipeline between the third and fifth pneumatic valves, and connected in series with the other end connected via a pipeline between the first temperature transmitter and the first differential pressure indicator.

9. The methanol fuel supply system according to claim 8, characterized in that: The methanol purging and venting unit also includes a thirteenth pneumatic valve, a twentieth normally open ball valve, a pneumatic diaphragm pump, a sixth check valve, and a twenty-first normally open ball valve connected in series via pipelines; a ninth shut-off valve and a fourth check valve are connected in series at one end to one side of the dual filter via pipelines, and are connected in series at the other end via pipelines between the thirteenth pneumatic valve and the twentieth normally open ball valve.

10. The methanol fuel supply system according to claim 9, characterized in that: One end of the seventh pneumatic valve is connected to the first methanol pump via a pipeline, and the other end is arranged between the twentieth normally open ball valve and the ninth pneumatic valve via a pipeline; one end of the eighth pneumatic valve is connected to the third heat exchanger via a pipeline, and the other end is arranged between the seventh pneumatic valve and the ninth pneumatic valve via a pipeline; one end of the sixth pneumatic valve is arranged between the first differential pressure indicator and the first pressure control valve via a pipeline, and the other end is arranged between the seventh pneumatic valve and the twentieth normally open ball valve via a pipeline; the nineteenth normally open ball valve and the fifth check valve are connected in series and then connected in parallel with the twentieth normally open ball valve, the pneumatic diaphragm pump, the sixth check valve, and the twenty-first normally open ball valve; the twenty-first normally open ball valve is connected to the discharge outlet.

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