A supply system for marine methanol fuel

Abstract

The present invention discloses a marine methanol fuel supply system, comprising a methanol supply module, a nitrogen purge / degradation module, a constant-temperature medium supply module, and a discharge module. The methanol supply module comprises a first methanol remote control valve, a methanol filter, a first methanol normally-open ball valve, a methanol booster pump, a second methanol normally-open ball valve, a methanol check valve, a first methanol stop valve, a methanol flowmeter, a second methanol stop valve, a methanol thermostat, a fourth methanol stop valve, a double-blocking double-drain valve, and a second methanol remote control valve. The nitrogen purge / degradation module comprises a methanol pipeline purge line, a methanol thermostat purge line, and a double-blocking double-drain valve purge line. The constant-temperature medium supply module comprises a primary constant-temperature medium supply line, an intermediate thermostat, and a secondary constant-temperature medium supply line. The discharge module is connected to the methanol supply module and the nitrogen purge / degradation module, respectively. The present invention is easy to control, has a low failure rate, and provides more rapid information feedback.

Description

Technical Field

[0001] The invention relates to a supply system for marine methanol fuel. Background Art

[0002] Methanol, as a carrier of (carbon and hydrogen) energy, is inherently clean. It is liquid at room temperature and pressure, making it advantageous compared to LNG due to its lower storage and transportation costs and reduced technical complexity. Replacing coal and fuel oil with methanol fuel can significantly reduce PM2.5 by over 80%, SO2 by over 95%, NOx by over 90%, and CO2 by over 50%. Orders for methanol-powered vessels are increasing daily, and with this surge, the supporting methanol bunkering industry is also booming. Therefore, the development of methanol-powered vessels is a market trend and an inevitable choice for shipbuilding transformation. Currently, the methanol inlet pressure of commonly used methanol marine engines is generally around 13 Bar. The fuel preparation room supply system is divided into two stages. First, the methanol fuel is transferred from the storage tank to the daily tank, and then from the daily tank to the ship's engine or generator. Before being delivered to the ship's main / auxiliary engines, a low-pressure pump is used to pressurize the normal-pressure methanol to an intermediate pressure of around 6 Bar. The initially pressurized methanol is stored in a buffer tank and then discharged from the buffer tank and pressurized by a high-pressure pump to the inlet pressure of 13 Bar for the ship's main / auxiliary engines. This two-stage pressurization supply system has the following shortcomings:

[0003] 1) From the methanol daily tank to the ship's main engine / auxiliary engine, two-stage booster pumps are required. The two-stage pumps need to be coordinated during fuel delivery, and the control system is relatively cumbersome;

[0004] 2) A buffer tank needs to be set between the two-stage booster pumps to adjust the information difference, flow difference and pressure difference between the pumps, which leads to problems such as slow adjustment and difficulty in reaching the two-stage balance point;

[0005] 3) The system is complex, with numerous equipment and high investment and maintenance costs. Summary of the Invention

[0006] The purpose of the present invention is to overcome the defects of the prior art and provide a marine methanol fuel supply system, which has the characteristics of compact structure, small space occupation, simple logical relationship, easy control, low failure rate and more agile information feedback.

[0007] The object of the present invention is achieved as follows: A marine methanol fuel supply system includes a methanol supply module, a nitrogen purge / degradation module, a constant temperature medium supply module and a discharge module; wherein,

[0008] The methanol supply module includes a methanol daily tank and a first methanol remote control valve, a methanol filter, a first methanol normally open ball valve, a methanol booster pump, a second methanol normally open ball valve, a methanol check valve, a first methanol stop valve, a methanol flow meter, a second methanol stop valve, a methanol thermostat, a fourth methanol stop valve, a double-blocking double-drain valve, and a second methanol remote control valve, which are sequentially connected in series with the methanol daily tank through a methanol pipeline; and further includes a third methanol stop valve connected between the inlet of the first methanol stop valve and the outlet of the second methanol stop valve, and a third methanol remote control valve connected between the outlet of the double-blocking double-drain valve and the return end of the methanol daily tank;

[0009] The nitrogen purge / degassing module includes a methanol pipeline purge line connected to the inlet of the methanol filter in the methanol supply module, a methanol thermostat purge line connected to the purge port of the methanol thermostat, and a double-blocking double-drain valve purge line connected to the purge ports of the two filters of the double-blocking double-drain valve;

[0010] The constant temperature medium supply module includes a constant temperature medium expansion tank, a primary constant temperature medium supply pipeline, an intermediate thermostat, and a secondary constant temperature medium supply pipeline connected in series between the outlet of the constant temperature medium expansion tank and the constant temperature medium inlet of the methanol thermostat; the constant temperature medium supply module also includes a constant temperature medium backflow prevention pipeline connected between the constant temperature medium outlet of the methanol thermostat and the reflux port of the constant temperature medium expansion tank;

[0011] The discharge module is respectively connected to the discharge port of the methanol daily tank in the methanol supply module, the discharge port of the methanol filter, the discharge port of the methanol booster pump, the discharge port of the methanol thermostat and the discharge ports of the two filters in the double-isolation double-drain valve; the discharge module is also connected to the nitrogen purge / degradation module.

[0012] The above-mentioned marine methanol fuel supply system, wherein the methanol supply module also includes four pressure sensors installed one-to-one at the outlet of the methanol filter, the outlet of the first methanol stop valve, the methanol outlet of the methanol thermostat and the outlet of the double-blocking double-relief valve, and three temperature sensors installed one-to-one at the outlet of the first methanol remote control valve, the outlet of the second methanol normally open ball valve and the methanol outlet of the methanol thermostat.

[0013] The above-mentioned marine methanol fuel supply system, wherein the nitrogen purge / degradation module includes a nitrogen source and a nitrogen shut-off valve, a nitrogen filter and a first nitrogen remote control valve connected in series with the nitrogen source in sequence;

[0014] The methanol pipeline purge pipeline includes a second nitrogen remote control valve and a first nitrogen check valve connected in series with the outlet of the first nitrogen remote control valve;

[0015] The methanol thermostat purge pipeline includes a third nitrogen remote control valve and a second nitrogen check valve connected in series with the outlet of the first nitrogen remote control valve;

[0016] The double-block double-relief valve purge pipeline includes a first nitrogen normally closed ball valve connected to the outlet of the nitrogen filter, and a first purge branch and a second purge branch connected one-to-one between the outlet of the first nitrogen normally closed ball valve and the purge ports of the two filters in the double-block double-relief valve; the first purge branch includes a second nitrogen normally closed ball valve and a third nitrogen check valve connected in series; the second purge branch includes a third nitrogen normally closed ball valve and a fourth nitrogen check valve connected in series.

[0017] In the above-mentioned marine methanol fuel supply system, the nitrogen purge / degradation module further includes a first excess nitrogen discharge pipeline and a second excess nitrogen discharge pipeline, both connected to the outlet of the first nitrogen remote control valve, and a third excess nitrogen discharge pipeline connected to the outlet of the first nitrogen normally closed ball valve; the first excess nitrogen discharge pipeline includes a fourth nitrogen remote control valve and a fifth nitrogen check valve connected in series; the second excess nitrogen discharge pipeline includes a fifth nitrogen remote control valve and a sixth nitrogen check valve connected in series; and the third excess nitrogen discharge pipeline includes a normally open ball valve and a seventh nitrogen check valve connected in series.

[0018] In the above-mentioned marine methanol fuel supply system, the constant temperature medium supply module further includes a spare primary constant temperature medium supply pipeline connected in parallel with the primary constant temperature medium supply pipeline and having the same structure as the primary constant temperature medium supply pipeline.

[0019] The above-mentioned marine methanol fuel supply system, wherein the primary constant temperature medium supply pipeline in the constant temperature medium supply module includes a first constant temperature medium stop valve, a first constant temperature medium filter, a first water pump, a first constant temperature medium check valve, and a second constant temperature medium stop valve connected in series in sequence;

[0020] The secondary constant temperature medium supply pipeline in the constant temperature medium supply module includes a fifth constant temperature medium stop valve and a sixth constant temperature medium stop valve connected in series;

[0021] The anti-conservative medium backflow pipeline includes a seventh constant temperature medium stop valve, a third constant temperature medium check valve, an adjustable three-way valve, a fourth constant temperature medium check valve and an eighth constant temperature medium stop valve which are sequentially connected in series.

[0022] The above-mentioned marine methanol fuel supply system, wherein the discharge module includes a discharge main pipe and a sewage tank connected to the outlet of the discharge main pipe;

[0023] The inlet of the discharge main pipe is connected to the two discharge ports of the methanol daily tank in a one-to-one correspondence through two manual stop valves; the inlet of the discharge main pipe is connected to the discharge port of the methanol filter through a first sewage remote control valve; the inlet of the discharge main pipe is connected to the discharge port of the methanol booster pump through a second sewage remote control valve; the inlet of the discharge main pipe is connected to the outlet of the methanol booster pump on the methanol pipeline through a third sewage remote control valve in turn; the inlet of the discharge main pipe is connected to the discharge port of the methanol thermostat through a fourth sewage remote control valve; the inlet of the discharge main pipe is connected to the outlet of the methanol thermostat on the methanol pipeline through a fifth sewage remote control valve; the inlet of the discharge main pipe is connected to the discharge ports of the two filters in the double-block double-drain valve in a one-to-one correspondence through two discharge stop valves; the inlet of the discharge main pipe is connected to the outlet of the double-block double-drain valve on the methanol pipeline through a sixth sewage remote control valve; and the inlet of the discharge main pipe is connected to the outlet of the second methanol remote control valve on the methanol pipeline through a seventh sewage remote control valve.

[0024] The above-mentioned marine methanol fuel supply system, wherein the discharge main pipe is composed of a first discharge pipeline and a second discharge pipeline connected in parallel; the first discharge pipeline is provided with a first normally open ball valve, a pneumatic pump, a first check valve and a second normally open ball valve connected in series in sequence; the second discharge pipeline is provided with a first check valve; the discharge main pipe is also equipped with a spare first discharge pipeline and a spare second discharge pipeline.

[0025] The marine methanol fuel supply system of the present invention has the following characteristics:

[0026] 1. The present invention adopts a one-stage methanol booster pump, which has simple logic relationship, easy control and low failure rate;

[0027] 2. The methanol fuel of the present invention adopts a one-stage pressurization and uses a methanol daily tank as a buffer, eliminating the need to consider the coordination issues between the two-stage power mechanisms, and providing more agile information feedback;

[0028] 3. The present invention has a compact structure and occupies little space, thereby improving the utilization rate of the ship's cargo space;

[0029] 4. The system and equipment of the present invention are streamlined, with low investment and maintenance costs, and have opened up new directions for energy conservation and emission reduction in ship power. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a schematic diagram of the structure of the marine methanol fuel supply system of the present invention;

[0031] Figure 2 This is a schematic diagram of the structure of the methanol supply module in the supply system of the present invention;

[0032] Figure 31. It is a schematic diagram of the structure of the nitrogen purge / degassing module in the supply system of the present invention;

[0033] Figure 4 It is a structural principle diagram of the constant temperature medium supply module in the supply system of the present invention;

[0034] Figure 5 It is a structural principle diagram of the discharge module in the supply system of the present invention. DETAILED DESCRIPTION

[0035] The present invention will be further described below with reference to the accompanying drawings.

[0036] See also Figures 1 to 5 The marine methanol fuel supply system of the present invention includes a methanol supply module 2, a nitrogen purge / degradation module 1, a constant temperature medium supply module 3 and a discharge module 4.

[0037] The methanol supply module 2 includes a methanol daily tank 2A ​​and a first methanol remote control valve 2-1, a methanol filter 2-3, a first methanol normally open ball valve 2-6, a methanol booster pump 2-7, a second methanol normally open ball valve 2-8, a methanol check valve 2-24, a first methanol stop valve 2-12, a methanol flow meter 2-25, a second methanol stop valve 2-13, a methanol thermostat 2B, a fourth methanol stop valve 2-19, a double isolation and double relief valve 2-10, and a second methanol remote control valve 2-23, which are sequentially connected in series with the methanol daily tank 2A ​​via a methanol pipeline; the module also includes a third methanol stop valve 2-14 connected between the inlet of the first methanol stop valve 2-12 and the outlet of the second methanol stop valve 2-13; and a third methanol remote control valve 2-21 connected between the outlet of the double isolation and double relief valve 2-20 and the return end of the methanol daily tank 2A.

[0038] The methanol supply module also includes four pressure sensors 2-22 installed one-to-one at the outlet of the methanol filter 2-3, the outlet of the first methanol stop valve 2-12, the methanol outlet of the methanol thermostat 2B and the outlet of the double-isolation double-relief valve 2-20, and three temperature sensors 2-17 installed one-to-one at the outlet of the first methanol remote control valve 2-1, the outlet of the second methanol normally open ball valve 2-8 and the methanol outlet of the methanol thermostat 2B.

[0039] The nitrogen purge / degradation module 1 includes a methanol pipeline purge line connected to the inlet of the methanol filter 2-3 in the methanol supply module 2, a methanol thermostat purge line connected to the purge port of the methanol thermostat 2B, and a double-blocking double-drain valve purge line connected to the purge ports of the two filters of the double-blocking double-drain valve 2-20;

[0040] The nitrogen purge / degradation module 1 includes a nitrogen source and a nitrogen shut-off valve 1-1, a nitrogen filter 1-2, and a first nitrogen remote control valve 1-5 connected in series with the nitrogen source; a first nitrogen pressure sensor 1-3 is installed at the outlet of the nitrogen filter 1-2;

[0041] The methanol pipeline purge line includes a second nitrogen remote control valve 1-16 and a first nitrogen check valve 1-17 connected in series with the outlet of the first nitrogen remote control valve 1-5;

[0042] The methanol thermostat purge line includes a third nitrogen remote control valve 1-6 and a second nitrogen check valve 1-8 connected in series with the outlet of the first nitrogen remote control valve 1-5;

[0043] The double-block double-blow valve purge pipeline includes a first nitrogen normally closed ball valve 1-23 connected to the outlet of the nitrogen filter 1-2, and a first purge branch and a second purge branch connected between the outlet of the first nitrogen normally closed ball valve 1-23 and the purge ports of the two filters in the double-block double-blow valve 1-20. A second nitrogen pressure sensor 1-22 is installed at the outlet of the first nitrogen normally closed ball valve 1-23. The first purge branch includes a second nitrogen normally closed ball valve 1-18 and a third nitrogen check valve 1-20 connected in series. The second purge branch includes a third nitrogen normally closed ball valve 1-19 and a fourth nitrogen check valve 1-21 connected in series.

[0044] The nitrogen purge / degradation module 1 also includes a first excess nitrogen discharge pipeline and a second excess nitrogen discharge pipeline, both of which are connected to the outlet of the first nitrogen remote control valve 1-5, and a third excess nitrogen discharge pipeline connected to the outlet of the first nitrogen normally closed ball valve 1-23; the first excess nitrogen discharge pipeline includes a fourth nitrogen remote control valve 1-10 and a fifth nitrogen check valve 1-12 connected in series; the second excess nitrogen discharge pipeline includes a fifth nitrogen remote control valve 1-7 and a sixth nitrogen check valve 1-9 connected in series; the third excess nitrogen discharge pipeline includes a normally open ball valve 1-13 and a seventh nitrogen check valve 1-11 connected in series.

[0045] The constant temperature medium supply module 3 includes a constant temperature medium expansion tank 3A, a primary constant temperature medium supply pipeline, an intermediate thermostat 3B, and a secondary constant temperature medium supply pipeline connected in series between the outlet of the constant temperature medium expansion tank 3A and the constant temperature medium inlet of the methanol thermostat 2B; a spare primary constant temperature medium supply pipeline connected in parallel with the primary constant temperature medium supply pipeline and having the same structure as the primary constant temperature medium supply pipeline; and a constant temperature medium backflow prevention pipeline connected between the constant temperature medium outlet of the methanol thermostat 2B and the reflux port of the constant temperature medium expansion tank 3A;

[0046] The primary constant temperature medium supply pipeline includes a first constant temperature medium stop valve 3-5, a first constant temperature medium filter 3-7, a first water pump 3-11, a first constant temperature medium check valve 3-13, and a second constant temperature medium stop valve 3-15 connected in series in sequence;

[0047] The standby primary constant temperature medium supply pipeline includes a third constant temperature medium stop valve 3-6, a second constant temperature medium filter 3-8, a second water pump 3-12, a second constant temperature medium check valve 3-14, and a fourth constant temperature medium stop valve 3-16 connected in series in sequence;

[0048] The first constant temperature medium pressure sensor 3-9 and the second constant temperature medium pressure sensor 3-10 are installed at the outlet of the first constant temperature medium filter 3-7 and the outlet of the second constant temperature medium filter 3-8 in a one-to-one correspondence; the third constant temperature medium pressure sensor 3-17 and the fourth constant temperature medium pressure sensor 3-18 are installed at the outlet of the second constant temperature medium stop valve 3-15 and the outlet of the fourth constant temperature medium stop valve 3-16 in a one-to-one correspondence;

[0049] The secondary constant temperature medium supply pipeline includes a fifth constant temperature medium stop valve 3-33 and a sixth constant temperature medium stop valve 3-26 connected in series. A temperature sensor 3-23 and a fifth constant temperature medium pressure sensor 3-24 are installed at the outlet of the fifth constant temperature medium stop valve 3-33.

[0050] The anti-constant temperature medium backflow pipeline includes a seventh constant temperature medium stop valve 3-27, a third constant temperature medium check valve 3-28, an adjustable three-way valve 3-30, a fourth constant temperature medium check valve 3-31 and an eighth constant temperature medium stop valve 3-32 connected in series in sequence; the other inlet of the adjustable three-way valve 3-30 is connected to the outlet of the fifth constant temperature medium stop valve 3-33.

[0051] The discharge module 4 is respectively connected to the discharge port of the methanol daily tank 2A ​​in the methanol supply module 2, the discharge port of the methanol filter 2-3, the discharge port of the methanol booster pump 2-7, the discharge port of the methanol thermostat 2B and the discharge port of the two filters in the double-isolation double-drain valve 2-20. The discharge module 4 is also connected to the nitrogen purge / degradation module 1.

[0052] The discharge module 4 includes a discharge main pipe 4A and a sewage tank 4B connected to the outlet of the discharge main pipe 4A;

[0053] The inlet of the discharge main pipe 4A is connected to the two discharge ports of the methanol daily tank 2A ​​through the first manual stop valve 4-23 and the second manual stop valve 4-24 in a one-to-one correspondence;

[0054] The inlet of the discharge main pipe 4A is connected to the discharge port of the methanol filter 2-3 through the first sewage remote control valve 4-1;

[0055] The inlet of the discharge main pipe 4A is connected to the discharge port of the methanol booster pump 2-7 through the second sewage remote control valve 4-2;

[0056] The inlet of the discharge main pipe 4A is connected to the outlet of the methanol booster pump 2-7 on the methanol pipeline through the first discharge stop valve 4-6 and the third sewage remote control valve 4-3 in sequence;

[0057] The inlet of the discharge main pipe 4A is connected to the discharge port of the methanol thermostat 2B through the first discharge stop valve 4-6 and the fourth sewage remote control valve 4-5 in sequence; the first night vision mirror 4-4 is installed at the inlet of the fourth sewage remote control valve 4-5;

[0058] The inlet of the discharge main pipe 4A is connected to the outlet of the methanol thermostat 2B on the methanol pipeline through the fifth sewage remote control valve 4-7;

[0059] The inlet of the discharge main pipe 4A is connected to the outlet of the second discharge stop valve 4-8 and the outlet of the third discharge stop valve 4-9 respectively through the discharge check valve 4-12. The inlet of the second discharge stop valve 4-8 and the inlet of the third discharge stop valve 4-9 are connected one-to-one to the discharge ports of the two filters in the double-blocking double-drain valve 2-20. The inlet of the discharge check valve 4-12 is installed with the discharge pressure sensor 4-10 and the second sight glass 4-11.

[0060] The inlet of the discharge main pipe 4A is connected to the outlet of the double-blocking double-drain valve 2-20 on the methanol pipeline through the sixth sewage remote control valve 4-13;

[0061] The inlet of the discharge main pipe 4A is connected to the outlet of the second methanol remote control valve 2-23 on the methanol pipeline through the seventh sewage remote control valve 4-14;

[0062] The inlet of the discharge main pipe 4A is connected to the outlet of the first excess nitrogen discharge pipeline, the outlet of the second excess nitrogen discharge pipeline, and the outlet of the third excess nitrogen discharge pipeline in the nitrogen purge / degradation module 1.

[0063] Install liquid level gauge 4-25 at the inlet of discharge main pipe 4A;

[0064] The discharge main pipe 4A is composed of a first discharge pipeline and a second discharge pipeline connected in parallel; a first discharge check valve 4-15 is provided on the first discharge pipeline; a first discharge normally open ball valve 4-16, a pneumatic pump 4C, a second discharge check valve 4-17 and a second discharge normally open ball valve 4-18 are connected in series in sequence on the second discharge pipeline; the discharge main pipe 4A is also equipped with a spare first discharge pipeline and a spare second discharge pipeline connected in parallel with the first discharge pipeline and the second discharge pipeline.

[0065] The marine methanol fuel supply system of the present invention first uses a nitrogen purge / degradation module 1 to purge the methanol pipeline of the methanol supply module 2 before methanol is supplied to ensure its cleanliness and degradability. The nitrogen shut-off valve 1-1 is opened, and nitrogen passes through the nitrogen filter 1-2 and nitrogen pressure sensor 1-3 in sequence. When the first nitrogen pressure sensor 1-3 detects that the pressure is within the set range, the first nitrogen remote control valve 1-5 is opened. Simultaneously, the second nitrogen remote control valve 1-16 of the methanol pipeline purge line is opened, and nitrogen is sequentially purged / degraded through the first nitrogen remote control valve 1-5, the second nitrogen remote control valve 1-16, and the first nitrogen check valve 1-17. Simultaneously, the first nitrogen remote control valve 1-5 of the methanol thermostat purge line is opened, and nitrogen is sequentially purged / degraded through the first nitrogen remote control valve 1-5, the third nitrogen remote control valve 1-6, and the second nitrogen check valve 1-8 to the methanol thermostat 2B. After the purge is completed, the fifth nitrogen remote control valve 1-7 of the second excess nitrogen discharge pipeline is opened, and the excess nitrogen from the pipeline is discharged into the discharge main pipe 4A of the discharge module 4 through the fifth nitrogen remote control valve 1-7 and the sixth nitrogen check valve 1-9 in sequence. When the two filters in the double-block double-relief valve 2-20 need to be purged / degraded, and when the second nitrogen pressure sensor 1-22 of the double-block double-relief valve purge line detects that the nitrogen pressure in the line is lower than the design pressure of the double-block double-relief valve 2-20, the first nitrogen normally closed ball valve 1-23, the second nitrogen normally closed ball valve 1-18, and the third nitrogen normally closed ball valve 1-19 of the double-block double-relief valve purge line are opened, and the normally open ball valve 1-13 of the third excess nitrogen discharge line is closed, and the double-block double-relief valve 2-20 is purged / degraded. After the purging is completed, the normally open ball valve 1-13 is opened, and the excess nitrogen is discharged into the discharge module 4 through the normally open ball valve 1-13 of the third excess nitrogen discharge line, the seventh nitrogen check valve 1-11, and the fourth nitrogen remote control valve 1-10 and the fifth nitrogen check valve 1-12 of the third excess nitrogen discharge line.

[0066] When the main engine / auxiliary engine of the ship sends a fuel demand signal, the first methanol remote control valve 2-1 in the methanol supply module 2 is opened, and the methanol from the methanol daily tank 2A ​​passes through the first methanol remote control valve 2-1 and the temperature sensor 2-2 in sequence and enters the methanol filter 2-3. When the first methanol pressure sensor 2-4 and the methanol pipeline level gauge 2-5 installed at the outlet of the methanol filter 2-3 detect that the temperature, pressure and liquid level of the methanol are within the set range, the methanol booster pump 2-7 is started, and the methanol passes through the first methanol normally open ball valve 2-6, the methanol booster pump 2-7, the second methanol normally open ball valve 2-8, the methanol check valve 2-24, the first methanol stop valve 2-12, the methanol flow meter 2-25, and the second methanol stop valve 2-13 in sequence. The methanol flow then flows through the methanol thermostat 2B and the fourth methanol shut-off valve 2-19, into the double-blocking, double-drain valve 2-20. When the methanol pressure detected by the second methanol pressure sensor 2-17 at the outlet of the methanol thermostat 2B falls below the fuel requirements of the main / auxiliary engines, the second methanol remote-control valve 2-23 remains closed, and the third methanol remote-control valve 2-21 opens, allowing methanol to be discharged back into the methanol daily tank 2A ​​through the third methanol remote-control valve 2-21. This pipeline continues in a continuous cycle until the second methanol pressure sensor 2-17 detects that the methanol pressure reaches the fuel requirements of the main / auxiliary engines. At this point, the second methanol remote-control valve 2-23 opens, and methanol is supplied to the main / auxiliary engines through the third methanol pressure sensor 2-22 and the second methanol remote-control valve 2-23. When the third methanol pressure sensor 2-22 detects that the pressure exceeds the inlet pressure requirements of the main / auxiliary engines, the third methanol remote-control valve 2-21 opens and closes in a breather-like manner, releasing pressure from the methanol pipeline until the third methanol pressure sensor 2-22 detects that the pressure reaches and stabilizes at the inlet pressure of the main / auxiliary engines. When the pressure in the methanol pipeline exceeds the design pressure, the safety valve 2-11 installed at the outlet of the methanol check valve 2-24 opens, allowing methanol to be discharged into the main discharge pipe 4A of the discharge module 4, relieving the pressure in the methanol pipeline. If the methanol flowmeter 2-25 malfunctions, the first and second methanol shut-off valves 2-12 and 2-13 close, and the third methanol shut-off valve 2-14 opens, allowing methanol to bypass the third methanol shut-off valve 2-14 and enter the methanol thermostat 2B. The methanol thermostat 2B uses a constant temperature medium supplied by the constant temperature medium supply module 3 to exchange heat with the methanol, maintaining a constant temperature for the methanol supplied to the main / auxiliary engines. The outlet temperature of the methanol is adjusted by adjusting the flow rate of the constant temperature medium to maintain the required inlet temperature for the main / auxiliary engines. The methanol booster pump 2-7 is a sealless, zero-leakage, zero-eddy-current loss, and zero-gassing magnetic drive pump. When the methanol booster pump 2-7 requires maintenance, the first and second methanol normally-open ball valves 2-6 and 2-8 are closed. The methanol in the methanol daily tank 2A ​​is supplied from the fuel tank 2C.

[0067] The thermostatic medium from the thermostatic medium expansion tank 3A of the thermostatic medium supply module 3 is discharged to the intermediate thermostat 3B via the first thermostatic medium shutoff valve 3-5, the first thermostatic medium filter 3-7, the first water pump 3-11, the first thermostatic medium check valve 3-13, and the second thermostatic medium shutoff valve 3-15 of the primary thermostatic medium supply pipeline. After heat exchange in the intermediate thermostat 3B, it is discharged through the fifth thermostatic medium shutoff valve 3-33 and the sixth thermostatic medium shutoff valve 3-26 of the secondary thermostatic medium supply pipeline to the methanol thermostat 2B. The heat exchange medium inlet of the intermediate thermostat 3B is equipped with a heat exchange medium pressure sensor 3-22 and a heat exchange medium temperature sensor 3-20 to monitor the inlet temperature and pressure of the heat exchange medium. The flow rate of the thermostatic medium entering the methanol thermostat 2B is adjusted by the opening of the adjustable three-way valve 3-30. The fifth thermostatic medium shutoff valve 3-33, the sixth thermostatic medium shutoff valve 3-26, the seventh thermostatic medium shutoff valve 3-27, and the eighth thermostatic medium shutoff valve 3-32 open synchronously with the first thermostatic medium shutoff valve 3-5. The third thermostatic medium check valve 3-28 and the fourth thermostatic medium check valve 3-31 in the thermostatic medium backflow prevention pipeline prevent thermostatic medium backflow during shutdown. A thermostatic medium temperature sensor 3-23 is installed on the inlet pipeline of the methanol thermostat 2B to monitor the temperature of the thermostatic medium. When the thermostatic medium expansion tank 3A needs to be cleaned, the first thermostatic medium normally closed ball valve 3-4, installed at the discharge port of the thermostatic medium expansion tank 3A, opens to discharge the thermostatic medium. When the methanol thermostat 2B needs to be cleaned / purged, the second thermostatic medium normally closed ball valve 3-29, installed on the thermostatic medium outlet pipeline of the methanol thermostat 2B, opens to discharge the thermostatic medium. The expansion tank level gauge 3-3, mounted above the constant temperature medium expansion tank 3A, detects the liquid level within the constant temperature medium expansion tank 3A. When the liquid level within the constant temperature medium expansion tank 3A falls below a set value, the expansion tank shut-off valve 3-1, mounted on the top of the constant temperature medium expansion tank 3A, opens to replenish constant temperature medium within the constant temperature medium expansion tank 3A. The normally open expansion tank ball valve 3-2, mounted on the top of the constant temperature medium expansion tank 3A, balances the pressure within the constant temperature medium expansion tank 3A.

[0068] When methanol or impurities in methanol filter 2-3 need to be discharged, first drain remote control valve 4-1 is opened, and the methanol or impurities are discharged through first drain remote control valve 4-1 via drain main pipe 4A to drain tank 4B. When gas, methanol, or impurities in methanol booster pump 2-7 need to be discharged, second drain remote control valve 4-2 is opened, and gas, methanol, or impurities in methanol booster pump 2-7 are discharged through second drain remote control valve 4-2 via drain main pipe 4A to drain tank 4B. Similarly, when substances in the methanol pipeline need to be discharged, third drain remote control valve 4-3, fifth drain remote control valve 4-7, sixth drain remote control valve 4-13, and seventh drain remote control valve 4-14 are opened. When substances in methanol thermostat 2B need to be discharged, fourth drain remote control valve 4-5 is opened, and the substances are discharged through drain main pipe 4A to drain tank 4B. When the material in the filter of the double-block, double-drain valve 2-20 needs to be discharged, the second and third discharge stop valves 4-8 and 4-9 are opened, and the material is discharged through the main discharge pipe 4A to the sewage tank 4B. The first discharge line in the discharge main pipe 4A discharges by gravity. When the ship is tilting or the discharge volume is large, methanol or impurities are discharged through the first discharge line in the discharge main pipe 4A. The second discharge line in the discharge main pipe 4A is discharged by pneumatic pump 4C. The material discharged from the first and second discharge lines is collected in the sewage tank 4B and finally discharged to the shore.

[0069] The above embodiments are only used to illustrate the present invention, rather than to limit the present invention. Those skilled in the art may make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also fall within the scope of the present invention and should be defined by the claims.

Claims

1. A methanol fuel supply system for ships, comprising a methanol supply module, a nitrogen purge / degradation module, a constant temperature medium supply module and a discharge module; characterized in that: The methanol supply module includes a methanol daily tank and a first methanol remote control valve, a methanol filter, a first methanol normally open ball valve, a methanol booster pump, a second methanol normally open ball valve, a methanol check valve, a first methanol stop valve, a methanol flow meter, a second methanol stop valve, a methanol thermostat, a fourth methanol stop valve, a double-blocking double-drain valve, and a second methanol remote control valve, which are sequentially connected in series with the methanol daily tank through a methanol pipeline; and further includes a third methanol stop valve connected between the inlet of the first methanol stop valve and the outlet of the second methanol stop valve, and a third methanol remote control valve connected between the outlet of the double-blocking double-drain valve and the return end of the methanol daily tank; The nitrogen purge / degassing module includes a methanol pipeline purge line connected to the inlet of the methanol filter in the methanol supply module, a methanol thermostat purge line connected to the purge port of the methanol thermostat, and a double-blocking double-drain valve purge line connected to the purge ports of the two filters of the double-blocking double-drain valve; The constant temperature medium supply module includes a constant temperature medium expansion tank, a primary constant temperature medium supply pipeline, an intermediate thermostat, and a secondary constant temperature medium supply pipeline connected in series between the outlet of the constant temperature medium expansion tank and the constant temperature medium inlet of the methanol thermostat; the constant temperature medium supply module also includes a constant temperature medium backflow prevention pipeline connected between the constant temperature medium outlet of the methanol thermostat and the reflux port of the constant temperature medium expansion tank; The discharge module is respectively connected to the discharge port of the methanol daily tank in the methanol supply module, the discharge port of the methanol filter, the discharge port of the methanol booster pump, the discharge port of the methanol thermostat and the discharge ports of the two filters in the double-isolation double-drain valve; the discharge module is also connected to the nitrogen purge / degradation module.

2. The marine methanol fuel supply system according to claim 1, characterized in that: The methanol supply module also includes four pressure sensors installed one-to-one at the outlet of the methanol filter, the outlet of the first methanol stop valve, the methanol outlet of the methanol thermostat and the outlet of the double-isolation and double-relief valve, and three temperature sensors installed one-to-one at the outlet of the first methanol remote control valve, the outlet of the second methanol normally open ball valve and the methanol outlet of the methanol thermostat.

3. The marine methanol fuel supply system according to claim 1, characterized in that: The nitrogen purge / degassing module includes a nitrogen source and a nitrogen shut-off valve, a nitrogen filter and a first nitrogen remote control valve connected in series with the nitrogen source in sequence; The methanol pipeline purge pipeline includes a second nitrogen remote control valve and a first nitrogen check valve connected in series with the outlet of the first nitrogen remote control valve; The methanol thermostat purge pipeline includes a third nitrogen remote control valve and a second nitrogen check valve connected in series with the outlet of the first nitrogen remote control valve; The double-block double-relief valve purge pipeline includes a first nitrogen normally closed ball valve connected to the outlet of the nitrogen filter, and a first purge branch and a second purge branch connected one-to-one between the outlet of the first nitrogen normally closed ball valve and the purge ports of the two filters in the double-block double-relief valve; the first purge branch includes a second nitrogen normally closed ball valve and a third nitrogen check valve connected in series; the second purge branch includes a third nitrogen normally closed ball valve and a fourth nitrogen check valve connected in series.

4. The marine methanol fuel supply system according to claim 3, characterized in that: The nitrogen purge / degassing module also includes a first excess nitrogen discharge pipeline and a second excess nitrogen discharge pipeline, both of which are connected to the outlet of the first nitrogen remote control valve, and a third excess nitrogen discharge pipeline connected to the outlet of the first nitrogen normally closed ball valve; the first excess nitrogen discharge pipeline includes a fourth nitrogen remote control valve and a fifth nitrogen check valve connected in series; the second excess nitrogen discharge pipeline includes a fifth nitrogen remote control valve and a sixth nitrogen check valve connected in series; the third excess nitrogen discharge pipeline includes a normally open ball valve and a seventh nitrogen check valve connected in series.

5. The marine methanol fuel supply system according to claim 1, characterized in that: The constant temperature medium supply module further includes a spare primary constant temperature medium supply pipeline connected in parallel with the primary constant temperature medium supply pipeline and having the same structure as the primary constant temperature medium supply pipeline.

6. The marine methanol fuel supply system according to claim 1, characterized in that: The primary constant temperature medium supply pipeline in the constant temperature medium supply module includes a first constant temperature medium stop valve, a first constant temperature medium filter, a first water pump, a first constant temperature medium check valve, and a second constant temperature medium stop valve connected in series in sequence; The secondary constant temperature medium supply pipeline in the constant temperature medium supply module includes a fifth constant temperature medium stop valve and a sixth constant temperature medium stop valve connected in series; The anti-conservative medium backflow pipeline includes a seventh constant temperature medium stop valve, a third constant temperature medium check valve, an adjustable three-way valve, a fourth constant temperature medium check valve and an eighth constant temperature medium stop valve which are sequentially connected in series.

7. The marine methanol fuel supply system according to claim 1, characterized in that: The discharge module includes a discharge main pipe and a sewage tank connected to the outlet of the discharge main pipe; The inlet of the discharge main pipe is connected to the two discharge ports of the methanol daily tank in a one-to-one correspondence through two manual stop valves; the inlet of the discharge main pipe is connected to the discharge port of the methanol filter through a first sewage remote control valve; the inlet of the discharge main pipe is connected to the discharge port of the methanol booster pump through a second sewage remote control valve; the inlet of the discharge main pipe is connected to the outlet of the methanol booster pump on the methanol pipeline through a third sewage remote control valve in turn; the inlet of the discharge main pipe is connected to the discharge port of the methanol thermostat through a fourth sewage remote control valve; the inlet of the discharge main pipe is connected to the outlet of the methanol thermostat on the methanol pipeline through a fifth sewage remote control valve; the inlet of the discharge main pipe is connected to the discharge ports of the two filters in the double-block double-drain valve in a one-to-one correspondence through two discharge stop valves; the inlet of the discharge main pipe is connected to the outlet of the double-block double-drain valve on the methanol pipeline through a sixth sewage remote control valve; and the inlet of the discharge main pipe is connected to the outlet of the second methanol remote control valve on the methanol pipeline through a seventh sewage remote control valve.

8. The marine methanol fuel supply system according to claim 7, characterized in that: The main discharge pipe is composed of a first discharge pipeline and a second discharge pipeline connected in parallel; the first discharge pipeline is provided with a first normally open ball valve, a pneumatic pump, a first check valve and a second normally open ball valve connected in series in sequence; the second discharge pipeline is provided with a first check valve; the main discharge pipe is also equipped with a spare first discharge pipeline and a spare second discharge pipeline.

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