CN217735634U - Methanol fuel supply system for ship - Google Patents

Abstract

The utility model discloses a boats and ships methanol fuel supply system, include: the methanol fuel tank comprises a methanol fuel bin (T1), a first methanol delivery pump (P4), a daily methanol cabinet (T2), a methanol supply pump (P1), a methanol buffer tank (T3), a methanol circulating pump (P2), a valve group unit and a methanol engine which are connected in sequence, wherein all the parts are connected by a supply pipeline. The utility model discloses carry the methyl alcohol fuel in the methyl alcohol bunker earlier for the daily cabinet of methyl alcohol through the fuel pump, then will satisfy the methyl alcohol fuel of burning condition through handling and carry for marine engine, provide power and other functions for boats and ships. 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.

Description

Methanol fuel supply system for ship

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 pressure of customer demand and regulation, the shipping industry is moving towards lower carbonation. At present, 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. On the way of realizing the 2030 year emission reduction target and the 2050 year zero emission target of the International Maritime Organization (IMO), the methanol can play an important role. 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 lacking infrastructure, methanol will play a key role as a marine fuel in order to achieve the goal of substantially reducing greenhouse gas and Particulate Matter (PM) emissions in mid-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 low emission of nitrogen oxides (NOx), so that the engine can meet the Tier III emission standard of the nitrogen oxides. Meanwhile, the emission of particulate matters generated by methanol combustion is 99 percent 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 a boats and ships methanol fuel feeding system.

The utility model provides a boats and ships methanol fuel feed system, include: the methanol fuel tank (T1), the first methanol delivery pump (P4), the daily methanol cabinet (T2), the methanol supply pump (P1), the methanol buffer tank (T3), the methanol circulating pump (P2), the valve group unit and the methanol engine are connected in sequence; the various components are connected by supply lines.

And the methanol fuel bin (T1) is used for storing original methanol fuel which is easy to store.

And the methanol daily cabinet (T2) is arranged on a deck higher than the methanol fuel pipeline and is used for storing the methanol fuel conveyed from the methanol fuel bin after primary filtration. The utility model discloses a daily cabinet of methyl alcohol (T2) is a normal pressure container. An inert gas unit pipeline is arranged at the top of the methanol daily cabinet (T2) and used for maintaining the pressure stability in the methanol daily cabinet (T2).

The methanol supply pipeline is connected with each equipment part and comprises a first methanol supply pipeline (L1), a second methanol supply pipeline (L2), a third methanol supply pipeline (L3), a fourth methanol supply pipeline (L4), a fifth methanol supply pipeline (L5), a sixth methanol supply pipeline (L6), an eleventh methanol supply pipeline (L11), a twelfth methanol supply pipeline (L12), a thirteenth methanol supply pipeline (L13), a fourteenth methanol supply pipeline (L14), a fifteenth methanol supply pipeline (L15) and a sixteenth methanol supply pipeline (L16).

Methanol buffer tank (T3) installs between methanol feed pump and methanol circulating pump, and the bearing capacity suits with the methanol feed pump outlet pressure in upper reaches, and the methanol return opening is reserved at the top, and when methanol circulating pump outlet flow was greater than low reaches engine demand flow, this methanol buffer tank recycle was returned through the return opening after the unnecessary fuel pressure regulating.

Ship methanol fuel feed system includes methyl alcohol filtering component, contains primary filter (F1), low pressure secondary filter (F2), high-pressure fine filter (DF 3).

The primary filter (F1) is arranged at the downstream of the first methanol delivery pump (P4) and is used for carrying out primary filtration on the fuel in the methanol fuel bin; a low-pressure secondary filter (F2) is arranged upstream of the methanol feed pump (P1) and performs secondary filtration of the methanol fuel from the methanol day tank (T2). A high-pressure fine filter (DF 3) is arranged at the downstream of the methanol circulating pump (P2) and is used for finely filtering the methanol fuel entering the downstream engine to reach the fuel particle precision required by the engine.

The utility model discloses an among the methyl alcohol fuel filtering component, the filter fineness of primary filter and low pressure secondary filter 20-50 mu m is difficult to the jam, and it is convenient to maintain, life cycle length. The high-pressure fine filter has higher filtering precision not less than 10 μm, meets the requirement of the ship engine on the granularity of the methanol fuel, and is arranged at the downstream of the high-pressure heat exchanger. The primary filter and the low-pressure secondary filter can be 2 filters respectively, the filtering precision is increased sequentially, and the two filters can be combined into one filter. The high-pressure fine filter is preferably a duplex filter because of high filtering precision and easy blockage, and two or more conventional filters can be selected to be connected in parallel so as to improve the safety and the use level.

The utility model discloses boats and ships methanol fuel supply system includes the inert gas unit, arranges respectively at the top of methyl alcohol bunker (T1) and methyl alcohol daily cabinet (T2). Blow and inert the fuel line when needing, also can maintain daily cabinet internal pressure stable, prevent simultaneously that poisonous boil-off gas from volatilizing to causing the risk in the atmosphere.

The inert gas unit is connected with the top spaces of the methanol fuel bin and the methanol daily cabinet, and the tops of the methanol fuel bin and the methanol daily cabinet are covered by the inert gas, so that on one hand, the evaporated methanol fuel gas is prevented from volatilizing to a safe area to cause potential safety hazards, on the other hand, the safe use of the methanol fuel bin and the methanol daily cabinet is protected, and negative pressure damage is prevented.

The utility model discloses a boats and ships methanol fuel supply system includes methyl alcohol heat transfer assembly, including low pressure heat exchanger (H1) and high pressure heat exchanger (H2), low pressure heat exchanger (H1) and methyl alcohol feed pump (P1) are parallelly connected; the system is used for maintaining the initial temperature of the methanol within the set range of the system design; a high pressure heat exchanger (H2) is installed in the feed line downstream of the methanol circulation pump (P2) for raising the methanol fuel eventually fed to the engine to a temperature required for engine operation.

The utility model discloses an among the heat exchange assembly the form of heat exchanger is unrestricted. The low-pressure heat exchanger (H1) is connected with the methanol supply pump (P1) in parallel, and the pressure-bearing capacity and the heat exchange capacity of the low-pressure heat exchanger are adaptive to the outlet pressure and the flow of the methanol supply pump. The high-pressure heat exchanger (H2) is arranged at the downstream of the methanol circulating pump (P2), and the pressure-bearing capacity and the heat exchange capacity of the high-pressure heat exchanger (H2) are adapted to the outlet pressure and the flow of the methanol circulating pump (P2). One or more low-pressure heat exchangers and one or more high-pressure heat exchangers can be arranged according to actual working conditions so as to meet the use working conditions.

The ship methanol fuel supply system comprises a methanol discharge recovery system, and the methanol discharge recovery system consists of a methanol discharge collection cabinet (T4), a methanol delivery pump II (P3) and a methanol discharge pipeline.

Furthermore, a plurality of methanol discharge pipelines can be arranged on each part of the ship methanol fuel supply system and the supply pipeline connected with the same as required to be connected with a methanol discharge collection cabinet (T4), and the methanol discharge collection cabinet (T4) is connected with the methanol fuel bin (T1) through a second methanol delivery pump (P3).

More preferably, the methanol bleed collection tank (T4) is located at the lowest part of the overall methanol fuel supply system. Any equipment or piping leaking methanol fuel can flow by gravity through the drain line into the fuel drain collection tank. A liquid Level Switch (LS) is arranged in the methanol discharge collection cabinet (T4). When the fuel in the fuel discharge collection cabinet reaches a set liquid level, the fuel can be recycled into the methanol fuel bin.

Methanol release pipeline include that methanol releases pipeline one (X1), methanol release pipeline two (X2), methanol release pipeline three (X3), methanol release pipeline four (X4), methanol release pipeline five (X5), methanol release pipeline six (X6), methanol release pipeline seven (X7), methanol release pipeline eight (X8), methanol release pipeline nine (X9), methanol release pipeline ten (X10), methanol release pipeline eleven (X11), methanol release pipeline twelve (X12).

The first methanol discharge pipeline (X1) to the tenth methanol discharge pipeline (X10) are respectively provided with a valve seven (V7), a valve eight (V8), a valve nine (V9), a valve ten (V10), a valve eleven (V11), a valve twelve (V12), a valve thirteen (V13), a valve fourteen (V14), a valve fifteen (V15) and a valve sixteen (V16).

The first methanol discharge pipeline (X1) to the tenth methanol discharge pipeline (X10) are respectively connected with the eleventh methanol discharge pipeline (X11).

Eleven (X11) methanol discharge pipelines, a methanol discharge collection cabinet (T4), twelve (X12) methanol discharge pipelines, a second (P3) methanol delivery pump and a methanol fuel bin (T1) are connected in sequence.

The utility model discloses a boats and ships methanol fuel supply system still includes methyl alcohol return line. According to the load change of a downstream transmitter, redundant methanol fuel flows back to a methanol fuel bin (T1) through a return pipeline, and a methanol daily cabinet (T2) or a methanol buffer tank (T3) ensures the methanol to be recycled.

Further, the utility model discloses methanol return pipeline specifically includes circulation pipeline one (h 1), circulation pipeline two (h 2), circulation pipeline three (h 3), circulation pipeline four (h 4), circulation pipeline five (h 5), circulation pipeline six (h 6), circulation pipeline seven (h 7), circulation pipeline eight (h 8).

The low-pressure heat exchanger (H1) and the methanol supply pump (P1) are connected in parallel by a circulation pipeline four (H4), a circulation pipeline five (H5), a circulation pipeline six (H6), a circulation pipeline seven (H7) and a circulation pipeline eight (H8), and a downstream pipeline of the low-pressure heat exchanger (H1) is provided with a valve three (V3).

Preferably, the first circulation pipeline (h 1) of the utility model is respectively connected with a methanol supply pipeline fourteen (L14) and a methanol buffer tank (T3), and the first circulation pipeline (h 1) is provided with a valve IV (V4); a second circulating pipeline (h 2) is respectively connected with the fuel valve group and the methanol daily cabinet (T2), and the second circulating pipeline (h 2) is provided with a fifth valve (V5); the third (h 3) of the circulating pipeline is respectively connected with the methanol engine and the daily methanol cabinet (T2), and the third (h 3) of the circulating pipeline is provided with a valve six (V6).

The utility model is applied to a plurality of methanol pumps, which specifically 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); the downstream of the methanol daily cabinet (T2) is provided with a methanol supply pump (P1) for pumping the methanol fuel in the methanol daily cabinet (T2), primarily pressurizing the fuel and then delivering the primarily pressurized fuel to a downstream methanol buffer tank (T3), and the downstream of the methanol buffer tank (T3) is provided with a methanol circulating pump (P2) for pumping the fuel in the methanol buffer tank to the pressure requirement of a downstream engine and delivering the fuel to the downstream engine for combustion. The utility model discloses a methanol pump divides methyl alcohol supply pump and methyl alcohol circulating pump. The methanol supply pump is positioned at the beginning of the methanol fuel supply system and used for primarily pressurizing the methanol to 5-8bar; the methanol circulating pump is positioned at the tail end of the methanol fuel supply system and used for pressurizing the methanol to the fuel pressure 10-14bar required by the methanol engine of the ship. The flow rates of the methanol supply pump and the methanol circulating pump are determined according to the fuel consumption of the methanol engine, and both the variable-frequency pump and the common pump can be selected and are suitable for the configuration of the methanol fuel supply system.

The fuel valve group unit is arranged between the methanol fuel supply system and the methanol engine and is the last safety isolation barrier for the methanol to enter the engine; the methanol engine is sequentially connected with a methanol supply pipeline fourteen (L14), a methanol supply pipeline fifteen (L15), a fuel valve group, a methanol supply pipeline sixteen (L16) and the methanol engine.

Furthermore, the utility model also has a valve I (V1) and a valve II (V2) on the methanol supply pipeline, the valve I (V1) is arranged between the daily methanol cabinet (T2) and the low-pressure secondary filter (F2); the second valve (V2) is provided between the methanol supply line fourteen (L14) and the methanol supply line fifteen (L15).

The utility model uses a plurality of methanol fuel pipelines, which comprise a methanol supply pipeline, a methanol return pipeline and a methanol discharge pipeline, wherein the methanol supply pipeline and the methanol return pipeline are both single-wall 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.

Still include multiple instrument and meter, temperature sensor and flowmeter among the instrument and meter feed back the temperature and the flow in the fuel supply pipeline respectively, satisfy the fuel demand of boats and ships methyl alcohol engine and entire system's under the different work condition safety guarantee through control system's effect. Wherein the pressure regulating device is used for regulating the pressure of the methanol in the return pipeline so as to achieve the purpose of combining with the supply pipeline.

Further, the utility model provides an instrument and meter set up the structure, specifically do:

the temperature sensor (TT 1) is arranged on the pipeline at the upstream of the low-pressure secondary filter (F2).

The flow meter (FMT 1) is arranged on a pipeline between the methanol supply pump (P1) and the methanol buffer tank (T3).

The temperature sensor (TT 2) is arranged on a pipeline between the high-pressure heat exchanger (H2) and the high-pressure fine filter (DF 3)

The pressure sensor (PIT) is provided on the line between the high-pressure fine filter (DF 3) and the valve two (V2), that is, on the tail end of the methanol supply line fourteen (L14).

The fuel supply system can be installed on any ship needing the fuel.

The utility model discloses an operation work flow and principle as follows:

the utility model provides a boats and ships methanol fuel feeding system, during the primary methanol fuel that the methanol delivery pump will store in the methanol bunker carries the daily cabinet of methyl alcohol through primary filter's filtration back, this daily cabinet ordinary pressure is saved, and the initial temperature range of methyl alcohol is-25- +45 ℃. The initial state opens the inlet valve of the methanol fuel supply system to allow the methanol in the methanol daily use cabinet to slowly fill the whole methanol supply pipeline and discharge the inert gas in the pipeline. And then a methanol supply pump and a methanol circulating pump are started, after the pump is started, a heat exchange assembly is also started to exchange heat with the methanol in the supply pipeline, so that the temperature of the methanol in the methanol supply pipeline is maintained within the temperature range of 25-50 ℃, and the temperature requirement of a downstream methanol engine on fuel is met. The methanol feed pump delivers methanol fuel to the methanol buffer tank via a methanol feed line, during which the methanol feed pump raises the pressure of the methanol to 5-8bar. The methanol buffer tank has the pressure-bearing capacity adaptive to the outlet of the methanol supply pump, and can maintain the stability of the suction port of the downstream methanol circulating pump. The methanol circulating pump conveys the methanol in the methanol buffer tank to the downstream continuously through a methanol supply pipeline, and the outlet pressure of the methanol circulating pump conforms to the pressure required by the current ship methanol engine on the market for methanol fuel, and is 9.5-13.5bar. The methanol delivered by the methanol circulating pump meets the combustion requirement of the ship methanol engine after being treated by the high-pressure heat exchanger and the fine filter, and then is delivered to the downstream ship methanol engine for combustion through the fuel valve group.

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

Every methanol supply pipeline that can form the closed section of this boats and ships methanol fuel supply system can all flow into the methyl alcohol collection cabinet through methyl alcohol bleeder line gravity automatically, and the methyl alcohol bleeder line has certain inclination, and this inclination is so that methyl alcohol can freely bleed to the methyl alcohol collection cabinet in be given first place. 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.

The utility model has the advantages 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.

Drawings

Fig. 1 is a schematic diagram of a methanol fuel supply system for a ship according to embodiment 1 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 first methanol delivery pump (P4), a methanol supply pump (P1), a methanol circulating pump (P2) and a second methanol delivery pump (P3);

a low-pressure heat exchanger (H1), a high-pressure heat exchanger (H2);

a primary filter (F1), a low-pressure secondary filter (F2), a high-pressure fine filter (DF 3);

a first valve (V1), a second valve (V2), a third valve (V3) and a fourth valve (V4); valve five (V5); valve six (V6), valve seven (V7), valve eight (V8), valve nine (V9), valve ten (V10), valve eleven (V11), valve twelve (V12), valve thirteen (V13), valve fourteen (V14), valve fifteen (V15), valve sixteen (V16);

a methanol supply line I (L1), a methanol supply line II (L2), a methanol supply line III (L3), a methanol supply line IV (L4), a methanol supply line V (L5), a methanol supply line VI (L6), a methanol supply line V (L11), a methanol supply line V (L12), a methanol supply line V (L13), a methanol supply line V (L14), a methanol supply line V (L15), a methanol supply line V (L16),

a first circulation pipeline (h 1), a second circulation pipeline (h 2), a third circulation pipeline (h 3), a fourth circulation pipeline (h 4), a fifth circulation pipeline (h 5), a sixth circulation pipeline (h 6), a seventh circulation pipeline (h 7) and an eighth circulation pipeline (h 8);

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 eleven (X11), a methanol discharge pipeline twelve (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 with the methanol fuel bin and the methanol daily-use cabinet are only for conveniently explaining the technical principle, and valves and instruments are also only for conveniently expressing the technical principle, and do not represent that the system is only provided with the valves and instruments 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

Fig. 1 is a schematic diagram of a methanol fuel supply system for a ship according to an embodiment of the present invention. The system comprises a methanol fuel bin T1, a methanol delivery pump P4, a primary filter F1, a low-pressure secondary filter F2, a high-pressure fine filter DF3 and a methanol daily cabinet T2, wherein the methanol fuel bin T1 is used for storing original methanol fuel in a normal-temperature normal-pressure state, the methanol delivery pump P4 sends the original methanol fuel in the methanol fuel bin T1 into the methanol daily cabinet T2, and the primary filter F1 is used for carrying out primary filtration on the original methanol fuel in the process to remove larger impurities and particulate matters in the fuel. The methanol delivery pump P4 passes through methanol supply pipeline L1, L2, L3 with the original methanol fuel in methanol fuel storehouse T1, and primary filter F1 carries into the daily cabinet of methanol T2, and the daily cabinet of methanol is normal atmospheric temperature storage container, and F1 is primary filter, carries out primary filter to the original methanol fuel in this methanol fuel storehouse T1, can filter the large granule impurity that gets into rear end daily cabinet of methanol T2, reduces the clearance maintenance work in later stage.

The height of the methanol daily cabinet T2 is higher than that of a methanol supply pipeline and each part in the pipeline at the downstream, the V1 valve is opened, other valves are closed, methanol can be slowly filled into the methanol supply pipelines L4, L5, L6, L11, L12, L13 and L14, the methanol supply pump P1 and the methanol circulating pump P2 are started after the methanol is filled, the fuel valves V3 and V4 are used, the methanol randomly fills the circulating pipelines H1, H4, H5, H6, H7 and H8, meanwhile, the heat exchange systems H1 and H2 are started, the system starts from circulation, the temperature sensor TT1 monitors the initial temperature of the methanol at the inlet end of the methanol supply pipeline, and the temperature sensor TT2 monitors the temperature of the methanol at the outlet of the heat exchanger H2, namely the temperature of the methanol finally delivered to the methanol engine by the methanol fuel supply system is 25-50 ℃. Pressure gauges are arranged at the inlet and the outlet of the methanol supply pump P1 and the methanol circulating pump P2 and are adapted to the technical parameters of the methanol pump, wherein the outlet pressure of the methanol supply pump P1 is 5-8bar, and the outlet pressure of the methanol circulating pump P2 is 10-16bar, so that the pressure requirement of a downstream methanol engine on methanol fuel is met.

And a PIT pressure sensor is arranged at the tail end of the fourteen (L14) methanol supply pipelines, and the pressure of the methanol at the tail end of the methanol fuel supply pipeline, namely the pressure of the methanol finally delivered to the methanol engine by the methanol fuel supply system, is monitored and displayed in real time. When the temperature and 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, the valve V2 can be opened, and the qualified methanol fuel can be directly conveyed to the methanol engine for use through the methanol supply pipeline L15, the fuel valve group and the methanol supply pipeline L16. In the embodiment, the high-pressure fine filter DF3 selects a duplex filter, a pressure difference sensor PDI is arranged at an inlet and an outlet of the filter to monitor the pressure difference between the inlet and the outlet of the filter element in real time, when the high pressure difference alarm appears on one operating side of the duplex filter DF3, the standby side of the DF3 can be switched to continue to operate on the premise of not influencing the operation of the whole methanol fuel supply system, and the high pressure difference alarm side is switched off at the same time, so that the maintenance and the repair are facilitated.

When the system is shut down, valves V1 and V2 on the methanol supply pipeline and valves V3 and V4 on the methanol return pipeline are closed, then automatic valves V7-V16 on the methanol circulation pipeline are opened, each methanol conveying pipeline capable of forming a closed pipe section can automatically converge into a discharge pipeline X11 through methanol discharge pipelines X1-X10 and automatically flow into a methanol discharge collection cabinet T4 through the discharge pipeline X11, 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 to convey methanol fuel in the methanol discharge collection cabinet T4 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 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. Except for the discharge pipeline, the fuel valve group unit and the methanol engine unit are respectively provided with a circulating pipeline h2 and a circulating pipeline h3, and the residual methanol fuel returns to the methanol daily cabinet T2 through the circulating pipelines h2 and h3 and the regulating valves V5 and V6 for recycling.

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.

In embodiment 1, 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, the pressure and the 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, the pressure and the flow rate of the methanol do not meet the requirements of each engine, a feedback signal is provided to the control system for optimal regulation, so 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.

It is obvious that the above embodiments of the present invention are only examples for clearly showing the invention, and are not intended to limit the embodiments of the present 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.

The present invention has been described in detail with reference to the foregoing embodiments, and it will be apparent to those skilled in the art that modifications and equivalents can be made without departing from the spirit and scope of the invention.

Claims (10)

1. A marine methanol fuel supply system, comprising: the methanol fuel tank (T1), the first methanol delivery pump (P4), the daily methanol cabinet (T2), the methanol supply pump (P1), the methanol buffer tank (T3), the methanol circulating pump (P2), the valve group unit and the methanol engine are connected in sequence; the various components are connected by supply lines.

2. Marine methanol fuel supply system according to claim 1, characterized in that it comprises a methanol filter assembly comprising a primary filter (F1), a low pressure secondary filter (F2), a high pressure fine filter (DF 3);

the primary filter (F1) is arranged at the downstream of the first methanol delivery pump (P4) and is used for carrying out primary filtration on the fuel in the methanol fuel bin; a low-pressure secondary filter (F2) is arranged upstream of the methanol feed pump (P1), and a high-pressure fine filter (DF 3) is arranged downstream of the methanol circulation pump (P2).

3. Marine methanol fuel supply system according to claim 1, characterized in that it comprises an inert gas unit arranged on top of the methanol fuel bunker (T1) and the methanol day tank (T2), respectively.

4. The marine methanol fuel supply system of claim 1, comprising a methanol heat exchange assembly comprising a low pressure heat exchanger (H1) and a high pressure heat exchanger (H2), the low pressure heat exchanger (H1) being connected in parallel with a methanol feed pump (P1); the system is used for maintaining the initial temperature of the methanol within the set range of the system design; a high pressure heat exchanger (H2) is installed in the feed line downstream of the methanol circulation pump (P2) for raising the methanol fuel eventually fed to the engine to a temperature required for engine operation.

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

each part of the 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).

6. Marine vessel methanol fuel supply system according to claim 5, characterized in that the methanol bleed collection cabinet (T4) is located at the lowest of the entire methanol fuel supply system.

7. Marine vessel methanol fuel supply system according to claim 5, characterised in that a Level Switch (LS) is arranged in the methanol discharge collection tank (T4).

8. The marine methanol fuel supply system of claim 1 further comprising a methanol return line.

9. The marine methanol fuel supply system of claim 8, wherein the methanol return line comprises: the valve group unit and the methanol engine are connected with any one of a methanol fuel bin (T1), a methanol daily cabinet (T2) and a methanol buffer tank (T3) through a circulating pipeline.

10. The marine methanol fuel supply system with redundant design of claim 7 wherein the methanol return line comprises: a circulating pipeline arranged on a supply pipeline between the high-pressure fine filter (DF 3) and the valve group unit is connected with any one of the methanol fuel bunker (T1), the methanol daily cabinet (T2) and the methanol buffer tank (T3).

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