CN218563774U

CN218563774U - Immersed ship methanol fuel supply system

Info

Publication number: CN218563774U
Application number: CN202222177194.5U
Authority: CN
Inventors: 曹学磊; 董营营; 郑建; 赵锐; 宋伟娟; 巩良; 陆亚军; 张吉恒
Original assignee: Heideway Technology Group Qingdao Co ltd
Current assignee: Heideway Technology Group Qingdao Co ltd
Priority date: 2022-08-18
Filing date: 2022-08-18
Publication date: 2023-03-03
Anticipated expiration: 2032-08-18

Abstract

The utility model discloses an submergence formula boats and ships methanol fuel feed system, include: the methanol fuel tank (T1), the methanol daily cabinet (T2), the methanol buffer tank (T3), the methanol circulating pump I (P2), the valve group unit and the methanol engine are connected in sequence; the various components are connected by supply lines; a methanol delivery pump I (P4) is arranged in the methanol fuel bin (T1), and the methanol delivery pump I (P4) is connected with a methanol daily cabinet (T2); the methanol daily cabinet (T2) is internally provided with a methanol supply pump (P1), and the methanol supply pump (P1) is connected with a methanol buffer tank (T3). The structure of the methanol fuel supply system of the ship provided by the utility model can be adjusted according to actual needs, is flexible and changeable, and can adapt to the needs of different ship types; the utility model discloses a methyl alcohol delivery pump and methyl alcohol feed pump are the submergence formula, can use methyl alcohol from the cooling, the utility model discloses a system methyl alcohol feed pump no longer set up with the circulation circuit of pump, save space.

Description

Immersed ship methanol fuel supply system

Technical Field

The present invention relates to a fuel supply system for a ship, and more particularly, to a methanol fuel supply system for a ship equipped with a methanol fuel engine.

Background

Under the dual pressures of customer demand and supervision, the shipping industry is moving towards lower carbonation. Currently, the available solutions are diverse in view of emission reduction potential, fuel density, service performance and fuel cost.

The use of new clean energy alternative fuels is imminent. Methanol can play an important role on the way of realizing 2030 year emission reduction target and 2050 year zero emission target of International Maritime Organization (IMO). Before the end of the 2023 year, the shipping industry will reduce greenhouse gas emissions by improving fuel efficiency, reducing shipping speeds, and using LNG fuels. In the current situation of zero emission fuel lack of infrastructure, methanol will play a key role as marine fuel in order to achieve the goal of greatly reducing greenhouse gas and Particulate Matter (PM) emissions in the middle term (2025-2040 years). Methanol is a familiar commodity to shippers and therefore has advantages in terms of processing experience and cost.

Compared with the traditional fuel, the methanol does not contain sulfur and has lower emission of nitrogen oxides (NOx), so that the engine can meet the emission standard of the nitrogen oxides Tier III. Meanwhile, the emission of particulate matters generated by methanol combustion is 99% lower than that of the conventional fuel. The emission of greenhouse gases can be obviously reduced by using the methanol without fossil raw materials. Ships can achieve emission reduction by using methanol as a fuel.

From a source, natural gas is the primary feedstock for methanol production, and as demand increases, there is sufficient natural gas to increase production. Methanol is readily available worldwide and existing infrastructure such as fuel ships and storage tanks can be readily transported and stored.

Methanol has the same low flash point characteristics as LNG from a safety standpoint, but unlike LNG, it can be stored in a conventional storage tank with minor modifications. The shipping industry has rich experience in handling methanol without safety issues in operation. Methanol is compatible with most marine engines, and the conversion cost of the existing engines using methanol is also obviously lower than that of other alternative fuels.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide an submergence formula boats and ships methyl alcohol fuel feed system. The utility model adopts the technical scheme as follows:

the utility model provides an submergence formula boats and ships methyl alcohol fuel feed system, include: the methanol fuel tank (T1), the methanol daily cabinet (T2), the methanol buffer tank (T3), the methanol circulating pump I (P2), the valve group unit and the methanol engine are connected in sequence; the various components are connected by supply lines.

A methanol delivery pump I (P4) is arranged in the methanol fuel bin (T1), and the methanol delivery pump I (P4) is connected with a methanol daily cabinet (T2).

The methanol daily cabinet (T2) is internally provided with a methanol supply pump (P1), and the methanol supply pump (P1) is connected with a methanol buffer tank (T3).

Furthermore, a low-pressure filter is arranged between the methanol daily cabinet (T2) and the methanol buffer tank (T3), the low-pressure filter is designed in a redundant mode, is used for one time and is standby for another time, and comprises a first low-pressure filter (F1) and a second low-pressure filter (F2) which are arranged in parallel.

Furthermore, a high-pressure fine filter is arranged between the methanol circulating pump I (P2) and the valve group unit. The high-pressure fine filter is of a redundant design, and comprises a first high-pressure fine filter (F3) and a second high-pressure fine filter (F4).

Further, the methanol fuel supply system for the ship further comprises a methanol heat exchange assembly which comprises a low-pressure heat exchanger (H1) and a high-pressure heat exchanger (H2).

The low-pressure heat exchanger (H1) is arranged between the low-pressure filter and the methanol buffer tank (T3).

The high-pressure heat exchanger I (H2) is arranged between the methanol circulating pump I (P2) and the high-pressure fine filter.

Further, the utility model discloses an submergence formula boats and ships methanol fuel feeding system still provides a methanol circulating pump and high pressure heat exchanger's redundant design, specifically is including methanol circulating pump two (P5) and the high pressure heat exchanger two (H3) that set up with methanol circulating pump (P2) and high pressure heat exchanger (H2) are parallelly connected.

Furthermore, a methanol circulating pump I (P2), a high-pressure heat exchanger I (H2) and a high-pressure fine filter I (F3) are connected in sequence; and a methanol circulating pump II (P5), a high-pressure heat exchanger II (H3) and a high-pressure fine filter II (F4) are connected in sequence.

According to the load change of the ship methanol engine, the consumption of the methanol fuel is different, and a methanol return pipeline is needed to be equipped to return the redundant methanol to a methanol buffer tank, a methanol daily cabinet or a methanol fuel bunker for continuous storage and use after the pressure of the redundant methanol is regulated by a pressure device.

Further, submergence formula boats and ships methanol fuel feed system includes that methyl alcohol releases recovery system, release including methyl alcohol and collect cabinet (T4), two (P3) of methyl alcohol delivery pump and methyl alcohol release the pipeline and constitute.

A plurality of methanol discharge pipelines are arranged on each part of the immersed ship methanol fuel supply system and supply pipelines connected with the immersed ship methanol fuel supply system and are connected with a methanol discharge collection cabinet (T4), and the methanol discharge collection cabinet (T4) is connected with a methanol fuel bin (T1) through a methanol delivery pump II (P3).

Further, the methanol discharge collection tank (T4) is located at the lowest position of the entire methanol fuel supply system. A liquid Level Switch (LS) is arranged in the methanol discharge collection cabinet (T4).

The utility model discloses an immersion boats and ships methanol fuel supply system's every can form the methyl alcohol supply line of enclosed segment and all can flow into methyl alcohol collection cabinet through methyl alcohol discharge line gravity automatically, and methyl alcohol discharge line has certain inclination, and this inclination is so that methyl alcohol can freely discharge and is main in the methyl alcohol collection cabinet. A liquid level switch is arranged in the collection cabinet, the collection cabinet reaches a set liquid point, and discharged and collected methanol fuel can flow back to a methanol daily cabinet or a methanol fuel bin.

Furthermore, inert gas is introduced into the top spaces of the methanol fuel bin (T1), the methanol daily cabinet (T2), the methanol buffer tank (T3) and the methanol discharge collection cabinet (T4), and the internal pressure stability is ensured by installing a pressure/vacuum release valve. The inert gas is connected to a safe discharge area for discharge through pipelines at the tops of a methanol fuel bunker (T1), a methanol daily cabinet (T2), a methanol buffer tank (T3) and a methanol discharge collection cabinet (T4).

Further, the marine methanol fuel supply system also comprises a methanol return system. The methanol reflux system comprises two parts, one part is that: the valve group unit and the methanol engine are connected with any one of a methanol daily cabinet (T2) and a methanol buffer tank (T3) through a return pipeline.

The other one is that: a return pipeline arranged on a supply pipeline between the high-pressure fine filter and the valve group unit is connected with any one of a methanol daily cabinet (T2) and a methanol buffer tank (T3).

That is to say, according to actual need, the return line that sets up in valves unit, methyl alcohol engine and the upstream pipeline of valves unit can connect the arbitrary one of methanol daily cabinet (T2), methyl alcohol buffer tank (T3) of backward flow.

Methanol reflux system, under the operating mode of difference, unnecessary methyl alcohol accessible return line returns methyl alcohol daily-use cabinet and methyl alcohol buffer tank after the pressure regulating and continues to store and use.

The fuel supply system can be installed on any ship that needs this fuel.

According to actual need, the utility model discloses an in each pipeline, set up various control flap for each process of control system. Meanwhile, various instruments are arranged.

The beneficial effects of the utility model are that:

the utility model provides a boats and ships methanol fuel supply system structure can adjust according to actual need, and is nimble changeable, adapts to the needs of different boats and ships types.

Because of the utility model discloses a methyl alcohol delivery pump and methyl alcohol supply pump are the submergence formula, can use methyl alcohol from the cooling, the utility model discloses a system no longer set up with the circulation circuit of pump, save space.

The utility model discloses a filter sets up redundant design, one with one spare, even a trouble takes place for one, reserve also can continue to take over work, does not influence the normal operating of system.

Drawings

Fig. 1 is a schematic diagram of the structural principle of the methanol fuel supply system of the submerged ship of the present invention.

Fig. 2 is a schematic structural diagram of a submerged ship methanol fuel supply system according to embodiment 2 of the present invention.

In the figure:

the system comprises a methanol fuel bin (T1), a methanol daily cabinet (T2), a methanol buffer tank (T3), a methanol discharge collection cabinet (T4) and a liquid Level Switch (LS);

a methanol delivery pump I (P4), a methanol supply pump P1, a methanol circulating pump I (P2), a methanol circulating pump II (P5) and a methanol delivery pump II (P3);

a low-pressure heat exchanger (H1), a first high-pressure heat exchanger (H2) and a second high-pressure heat exchanger (H3);

a first low-pressure filter (F1), a first high-pressure fine filter (F3);

a second low-pressure filter (F2), a second high-pressure fine filter (F4);

a first return line (h 1), a second return line (h 2), a third return line (h 3) and a fourth return line (h 4);

a methanol discharge pipeline I (X1), a methanol discharge pipeline II (X2), a methanol discharge pipeline III (X3), a methanol discharge pipeline IV (X4), a methanol discharge pipeline V (X5), a methanol discharge pipeline VI (X6), a methanol discharge pipeline VII (X7), a methanol discharge pipeline VIII (X8), a methanol discharge pipeline IX (X9), a methanol discharge pipeline VI (X10), a methanol discharge pipeline IX (X11), a methanol discharge pipeline VII (X12),

the temperature sensor (TT 1), the flowmeter (FMT 1), the temperature sensor (TT 2) and the pressure sensor (PIT).

Detailed Description

Specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings and examples. The following examples are intended to illustrate the invention, but are not intended to limit the scope of the invention.

In the schematic diagram of the utility model, the connection positions of various pipelines, methanol fuel bin and methanol daily cabinet are only for convenience of explaining the technical principle, and valves and instruments and meters are also only for convenience of expressing the technical principle, and do not represent that the system is only provided with valves and instruments and meters shown in the figure; the schematic only depicts the supply, return and bleed lines for methanol fuel, no further lines associated with the methanol fuel supply are shown, and the fuel lines are not representative of only three of these types; the interfaces of the various components in the schematic diagrams are only used for convenience in describing processes and principles, and the relevant interfaces are illustrated and do not represent the interfaces only illustrated; only one set of methanol fueled engines is drawn to represent downstream users and does not represent only one set that can be supplied.

Example 1

As shown in fig. 1, the present embodiment provides a submerged marine methanol fuel supply system, including: the methanol fuel tank (T1), the methanol daily cabinet (T2), the methanol buffer tank (T3), the methanol circulating pump I (P2), the valve group unit and the methanol engine are connected in sequence; the various components are connected by supply lines.

A low-pressure filter is arranged between the methanol daily cabinet (T2) and the methanol buffer tank (T3), the low-pressure filter is designed in a redundant mode, is used for one purpose and is prepared for another purpose, and comprises a first low-pressure filter (F1) and a second low-pressure filter (F2) which are arranged in parallel.

A high-pressure fine filter is arranged between the methanol circulating pump I (P2) and the valve group unit. The high-pressure fine filter is designed in a redundant mode, and comprises a first high-pressure fine filter (F3) and a second high-pressure fine filter (F4).

The methanol fuel supply system for the ship further comprises a methanol heat exchange assembly which comprises a low-pressure heat exchanger (H1) and a high-pressure heat exchanger (H2).

The embodiment provides a methanol discharge recovery system, which comprises a methanol discharge collection cabinet (T4), a methanol delivery pump II (P3) and a methanol discharge pipeline.

According to actual needs, on each part of this embodiment and the supply line of connection, all can set up a plurality of methyl alcohol discharge pipelines and be connected with methyl alcohol discharge collection cabinet (T4), methyl alcohol discharge collection cabinet (T4) is continuous with methyl alcohol bunker (T1) through methyl alcohol delivery pump two (P3) again. The methanol discharge collection tank (T4) is positioned at the lowest part of the whole methanol fuel supply system. A liquid Level Switch (LS) is arranged in the methanol discharge collection cabinet (T4).

Every methyl alcohol supply line that can form the closed section of the submergence formula boats and ships methyl alcohol fuel feed system of this embodiment can all flow into methyl alcohol collection cabinet through methyl alcohol bleeder line gravity by oneself, and methyl alcohol bleeder line has certain inclination, and this inclination is so that methyl alcohol can freely discharge in the methyl alcohol collection cabinet and give first place to. A liquid level switch is arranged in the collection cabinet, the collection cabinet reaches a set liquid point, and discharged and collected methanol fuel can flow back to a methanol daily cabinet or a methanol fuel bin.

In the embodiment, the top spaces of the methanol fuel bin (T1), the methanol daily cabinet (T2), the methanol buffer tank (T3) and the methanol discharge collection cabinet (T4) are provided with discharge pipelines, inert gas is introduced from the top, and the internal pressure is ensured by installing a pressure/vacuum release valve. The inert gas is connected to a safe discharge area for discharge through pipelines at the tops of a methanol fuel bunker (T1), a methanol daily cabinet (T2), a methanol buffer tank (T3) and a methanol discharge collection cabinet (T4).

The methanol fuel supply system for the ship also comprises a methanol return system. Under different working conditions, the redundant methanol can return to a methanol daily cabinet and a methanol buffer tank for continuous storage and use after pressure regulation through the return pipeline.

According to actual need, the utility model discloses an in each pipeline, set up various control flap for each process of control system. Meanwhile, various instruments are arranged on the pipeline.

In the submerged methanol fuel supply system for ships, the methanol fuel bin (T1) is used for storing original methanol fuel which is easy to store. The methanol daily cabinet (T2) is arranged on a deck higher than a methanol supply pipeline and is used for storing the methanol fuel which is delivered from the methanol fuel bin after primary filtration.

This example uses a variety of methanol pumps, which function and are classified as follows:

comprises a methanol delivery pump I (P4), a methanol supply pump (P1) and a methanol circulating pump (P2); the methanol delivery pump I (P4) is connected with the methanol fuel bin (T1) and the daily methanol cabinet (T2) and delivers the original methanol fuel in the methanol fuel bin (T1) to the daily methanol cabinet (T2); and is arranged in the methanol fuel bin (T1) to play the role of heat insulation and temperature reduction.

A methanol supply pump (P1) is arranged in the methanol daily cabinet (T2), the methanol is primarily pressurized to 5-6bar, the methanol supply pump is used for pumping methanol fuel in the methanol daily cabinet (T2) and primarily pressurizing the fuel and then conveying the fuel to a downstream methanol buffer tank (T3), a methanol circulating pump (P2) is arranged at the downstream of the methanol buffer tank (T3) and is used for pressurizing the methanol to the fuel pressure 10-13bar required by a ship methanol engine, and the methanol supply pump is used for pumping the fuel in the methanol buffer tank and pressurizing the fuel to the pressure requirement of a downstream engine and conveying the fuel to the downstream engine for combustion; and the second methanol delivery pump (P3) is used for sending the methanol in the methanol discharge collection cabinet (T4) back to the methanol fuel bin (T1).

The methanol heat exchange assembly comprises a low-pressure heat exchanger (H1) and a high-pressure heat exchanger (H2), wherein the low-pressure heat exchanger (H1) is used for maintaining the initial temperature of methanol within a system design set range; the high pressure heat exchanger (H2) is used to raise the methanol fuel ultimately supplied to the engine to the temperature required for engine operation.

A methanol filtration module comprising a low pressure filter and a high pressure fine filter; the low pressure filter filters the methanol fuel from the methanol day tank (T2). The high pressure fine filter finely filters the methanol fuel that is about to enter the downstream engine to achieve the fuel particulate accuracy required by the engine.

And the valve group unit is arranged between the methanol fuel supply system and the methanol engine and is the last safety isolation barrier for methanol to enter the engine.

This embodiment provides an instrument and meter's setting structure, specifically is: the temperature sensor (TT 1) is arranged on the downstream pipeline of the methanol daily cabinet T2,

the flowmeter (FMT 1) is arranged on a downstream pipeline of the low-pressure heat exchanger (H1), the temperature sensor (TT 2) is arranged on a downstream pipeline of the high-pressure heat exchanger (H2), and the pressure sensor (PIT) is arranged on a downstream pipeline of the high-pressure fine filter.

The configured PIT pressure sensor monitors and displays the methanol pressure at the tail end of the methanol supply pipeline in real time, namely the methanol pressure finally delivered to the methanol engine by the methanol fuel supply system. When the temperature and the pressure of the methanol processed by the whole methanol fuel supply system meet the requirements of a downstream methanol engine, the whole system is in a stable and applicable state, at the moment, a valve on a pipeline can be opened, and the qualified methanol fuel can be directly conveyed to the methanol engine for use through a methanol supply pipeline and a fuel valve group.

In the embodiment, the redundant design duplex filter selected by the high-pressure fine filter is adopted, the pressure difference sensor PDI is arranged at the inlet and the outlet of the filter to monitor the pressure difference of the inlet and the outlet of the filter element in real time, when the high pressure difference alarm appears at the running side of the redundant design duplex filter, the standby side of the high-pressure fine filter can be switched to continue running on the premise of not influencing the running of the whole methanol fuel supply system, and the high pressure difference alarm side is switched off simultaneously, so that the maintenance is facilitated.

The inert gas units are arranged at the tops of the methanol fuel bin T1 and the methanol daily cabinet T2 and used for maintaining stable internal pressure, when the pressure is high, the inert gas is discharged from the tops of the methanol fuel bin T1 and the methanol daily cabinet T2 and returns to the inert gas units, and when the pressure is reduced, the inert gas enters the top spaces of the methanol fuel bin T1 and the methanol daily cabinet T2, so that the arrangement can maintain stable pressure and avoid potential safety hazards caused by methanol volatilization to a safe area.

Example 2

As shown in fig. 2, the present embodiment provides an improved submerged marine methanol fuel supply system. The difference from embodiment 1 is that the system of this embodiment further includes a redundant design of a methanol circulation pump and a high-pressure heat exchanger, and specifically includes a methanol circulation pump two (P5) and a high-pressure heat exchanger two (H3) that are arranged in parallel with the methanol circulation pump one (P2) and the high-pressure heat exchanger one (H2).

The methanol circulating pump I (P2), the high-pressure heat exchanger I (H2) and the high-pressure fine filter I (F3) are sequentially connected to form a branch pipeline; and a methanol circulating pump II (P5), a high-pressure heat exchanger II (H3) and a high-pressure fine filter II (F4) are sequentially connected to form another pipeline connected in parallel.

Example 3

As shown in fig. 1 or 2, this embodiment provides a specific methanol release recovery system structure, in a downstream pipeline of a methanol fuel bunker (T1), a daily methanol cabinet (T2), a downstream pipeline of a low-pressure filter, a downstream pipeline of a low-pressure heat exchanger (H1), a methanol buffer tank (T3), a downstream pipeline of a methanol circulating pump (P2), a downstream pipeline of a high-pressure fine filter, a valve bank unit and a methanol engine are respectively provided with a first methanol release pipeline (X1), a second methanol release pipeline (X2), a third methanol release pipeline (X3), a fourth methanol release pipeline (X4), a fifth methanol release pipeline (X5), a sixth methanol release pipeline (X6), a seventh methanol release pipeline (X7), an eighth methanol release pipeline (X8), a ninth methanol release pipeline (X9), and a tenth methanol release pipeline (X10).

The above-mentioned first to eleventh methanol drain lines (X1 to X11) are connected to the eleventh methanol drain line (X11).

The methanol discharge pipeline eleven (X11) is sequentially connected with a methanol discharge collection cabinet (T4), a methanol discharge pipeline twelve (X12), a methanol delivery pump II (P3) and a methanol fuel bin (T1).

When the system is shut down, the corresponding valve on the methanol supply pipeline is closed, then the valve on the methanol discharge recovery pipeline is opened, every section of methanol conveying pipeline capable of forming a closed pipeline section can be automatically collected through the methanol discharge pipeline, and automatically flows into the methanol discharge collection cabinet T4 through the discharge pipeline X11 by gravity, wherein a liquid level switch LS is arranged in the methanol discharge collection cabinet T4, when the liquid level exceeds a set value, a methanol conveying pump P3 is started, the methanol fuel in the methanol discharge collection cabinet T4 is conveyed back to a methanol fuel bin T1, and the methanol discharge collection cabinet T4 is prevented from exceeding the limit. The methanol blowdown collection tank T4 is typically located below the methanol delivery line and the arrangement of the blowdown lines X1-X11 is such that gravity flow of the blowdown fuel into the blowdown collection tank T4 is facilitated.

In this embodiment the discharge line X11 is a double walled tube with a slight slope in the safety zone, which further reduces the risk of fuel leakage.

Example 4

As shown in fig. 1 or 2, the present embodiment provides a specific methanol recirculation system structure, and the marine methanol fuel supply system also includes a methanol recirculation system. The methanol return line comprises two sections.

One is that the method comprises the following steps: the valve group unit and the methanol engine are connected with any one of a methanol daily cabinet (T2) and a methanol buffer tank (T3) through a return pipeline. The present embodiment provides an example of connection to a methanol day tank (T2), and excess methanol in the valve block unit and the methanol engine is returned to the methanol day tank (T2).

The other one is that: a return pipeline arranged on a supply pipeline between the high-pressure fine filter and the valve group unit is connected with any one of a methanol daily cabinet (T2) and a methanol buffer tank (T3). The present embodiment provides an example of connection with a methanol buffer tank (T3), and a return line (h 1) is provided in the supply line between the high pressure fine filter and the valve block unit to connect with the methanol buffer tank (T3).

In the above embodiments, the temperature sensor TT1, the flow meter FMT1, the temperature sensor TT2 and the pressure sensor PIT are used to monitor and feed back whether the temperature, pressure and flow rate of the methanol provided by the methanol fuel supply system of the ship meet the requirements of each engine, and if the temperature, pressure and flow rate of the methanol provided by the methanol fuel supply system of the ship do not meet the requirements of providing a feedback signal to the control system for optimal regulation, detailed regulation processes are not repeated herein. The respective equipment numbers and pipeline numbers are only for the purpose of describing the principle of the ship fuel supply system in an aspect and do not represent other meanings.

In all embodiments of the present invention, the methanol supply pipeline, the methanol return pipeline and the methanol discharge pipeline are single-walled stainless steel pipes; the methanol discharge pipeline is divided into two parts, the part connected with the methanol supply pipeline is a single-wall stainless steel pipe, all the discharge pipelines connected with the methanol supply pipeline finally converge to a double-wall pipe which has a certain gradient and is connected with the methanol discharge cabinet, and the double-wall pipe inclines towards the direction of the methanol daily cabinet so as to facilitate the discharged methanol to smoothly flow into the methanol daily cabinet. The outer pipe of the double-wall pipe is designed with the lowest point, and the lowest point can be designed into various shapes according to the installation position, the difficulty degree and the forming difficulty degree.

The above embodiments of the present invention are merely examples for clarity of the invention, and are not intended to limit the embodiments of the invention. Other variations and combinations will be apparent to those skilled in the art upon consideration of the foregoing description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, or improvement made within the principle and principle of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A submerged marine methanol fuel supply system, comprising: the methanol fuel tank (T1), the methanol daily cabinet (T2), the methanol buffer tank (T3), the methanol circulating pump I (P2), the valve group unit and the methanol engine are connected in sequence; the various components are connected by supply lines;

a methanol delivery pump I (P4) is arranged in the methanol fuel bin (T1), and the methanol delivery pump I (P4) is connected with a methanol daily cabinet (T2);

2. The submerged marine methanol fuel supply system of claim 1, characterized in that a low pressure filter is arranged between the methanol day tank (T2) and the methanol buffer tank (T3), the low pressure filter is of a redundant design, and comprises a first low pressure filter (F1) and a second low pressure filter (F2) which are arranged in parallel.

3. The submerged marine methanol fuel supply system as claimed in claim 1, characterized in that a high pressure fine filter is arranged between the methanol circulation pump one (P2) and the valve block unit.

4. The submerged marine methanol fuel supply system of claim 1, wherein the high pressure fine filter is of redundant design, one-use-one-standby, comprising a first high pressure fine filter (F3) and a second high pressure fine filter (F4).

5. A submerged marine methanol fuel supply system according to claim 1 further comprising a methanol heat exchange assembly comprising a low pressure heat exchanger (H1) and a high pressure heat exchanger one (H2);

the low-pressure heat exchanger (H1) is arranged between the low-pressure filter and the methanol buffer tank (T3);

6. The submerged marine methanol fuel supply system of claim 5, further comprising a methanol circulation pump two (P5) and a high pressure heat exchanger two (H3) arranged in parallel with the methanol circulation pump one (P2) and the high pressure heat exchanger one (H2).

7. The submerged marine methanol fuel supply system of claim 1, further comprising a methanol discharge recovery system comprising a methanol discharge collection cabinet (T4), a second methanol delivery pump (P3) and a methanol discharge pipeline,

each part of the immersed ship methanol fuel supply system and a supply pipeline connected with the part are provided with a plurality of methanol discharge pipelines connected with a methanol discharge collection cabinet (T4), and the methanol discharge collection cabinet (T4) is connected with a methanol fuel bin (T1) through a methanol delivery pump II (P3).

8. A submerged marine methanol fuel supply system according to claim 7, characterized in that the methanol bleed collection cabinet (T4) is located at the lowest part of the overall methanol fuel supply system.

9. Submerged marine methanol fuel supply system according to claim 7, characterized in that a Level Switch (LS) is arranged in the methanol discharge collection tank (T4).

10. The submerged marine methanol fuel supply system of claim 7, characterized in that the headspace of the methanol fuel bunker (T1), the methanol day tank (T2), the methanol buffer tank (T3) and the methanol discharge collection tank (T4) is filled with inert gas, and the internal pressure is ensured to be stable by installing a pressure/vacuum release valve.