Methanol fuel supply system and ship management system

Abstract

The present invention provides a methanol fuel supply system and a ship management system. The methanol fuel supply system includes: a boosting and temperature regulating module, which includes a main engine supply unit, an auxiliary engine supply unit, a methanol buffer tank, and a double-tube heat exchanger; the main engine supply unit includes a methanol storage tank and a main supply path, and a first-stage booster pump and a second-stage booster pump are provided on the main supply path; the input end of the methanol buffer tank is connected to the output end of the first-stage booster pump, the first output end of the methanol buffer tank is connected to the auxiliary engine supply unit, and its second output end is connected to the second-stage booster pump; the first input end of the double-tube heat exchanger is connected to the auxiliary engine supply unit, its second input end is connected to the output end of the second-stage booster pump, the first output end of the double-tube heat exchanger is connected to the auxiliary engine, and its second output end is connected to the main engine. The present invention can supply methanol fuel to both the main engine and the auxiliary engine simultaneously, and has the ability to resist pressure and temperature fluctuations.

Description

Technical Field

[0001] The present invention relates to the technical field of clean energy applications, and particularly to a methanol fuel supply system and a ship management system. Background Art

[0002] As a clean energy source for ships, methanol has the characteristics of convenient storage, transportation, and rich resources. Using it as a ship fuel will not produce sulfur emissions, and the PM emissions are very low. The carbon dioxide emissions can also be reduced by about 20% compared with conventional marine fuel oil.

[0003] Although the methanol supply system has a certain application basis in the automotive field, in China, the supply of methanol for ships is still in the development stage. For example, a marine methanol fuel supply system (publication number: CN 114320688 A), which controls parameters such as the temperature, pressure, and flow rate of methanol by means of secondary temperature regulation and secondary pressurization to meet the fuel requirements of the engine. However, the design of this system is relatively complex, resulting in too high equipment investment costs and large space occupation, and only considering the supply to the main engine without considering the supply to the auxiliary engine. If this system design method is adopted and the supply to both the main engine and the auxiliary engine is considered simultaneously, a three-stage temperature regulation and three-stage pressurization method is required to meet the requirements of the main engine and the auxiliary engine, further increasing the equipment investment and space occupation. Summary of the Invention

[0004] The present invention provides a methanol fuel supply system and a ship management system to solve the problems in the prior art that the marine methanol fuel supply system only considers the supply of methanol to the main engine without considering the supply of methanol to the auxiliary engine, or if the simultaneous supply of methanol fuel to the main engine and the auxiliary engine is to be achieved, it will cause too high equipment investment costs and large space occupation.

[0005] In a first aspect, the present invention provides a methanol fuel supply system, which is applied to a ship management system including a main engine and an auxiliary engine. The methanol fuel supply system includes:

[0006] A pressurization and temperature regulation module, which includes a main engine supply unit, an auxiliary engine supply unit, a methanol buffer tank, and a double-tube heat exchanger; the main engine supply unit includes a methanol storage tank and a main supply path connected to the methanol storage tank, and a primary booster pump and a secondary booster pump are provided on the main supply path; the auxiliary engine supply unit includes a supply bypass; the input end of the methanol buffer tank is connected to the output end of the primary booster pump, the first output end of the methanol buffer tank is connected to the auxiliary engine supply unit, and its second output end is connected to the secondary booster pump; the first input end of the double-tube heat exchanger is connected to the auxiliary engine supply unit, its second input end is connected to the output end of the secondary booster pump, the first output end of the double-tube heat exchanger is connected to the auxiliary engine, and its second output end is connected to the main engine;

[0007] The host supply unit pressurizes the methanol output from the methanol storage tank through the first-stage booster pump on the main supply path and then inputs it into the methanol buffer tank. The methanol output from the methanol buffer tank is divided into two paths: one path enters the double-connected heat exchanger through the auxiliary machine supply unit for temperature adjustment and then supplies the auxiliary machine, and the other path is pressurized by the second-stage booster pump and then input into the double-connected heat exchanger for temperature adjustment and then supplies the host; the host supply unit and the auxiliary machine supply unit share the double-connected heat exchanger to achieve single-stage temperature adjustment.

[0008] In an embodiment of the present invention, the host supply unit further includes a first-stage pressurization return pipeline and a first-stage pressurization return regulating valve provided on the first-stage pressurization return pipeline. One end of the first-stage pressurization return pipeline is connected to the output end of the first-stage booster pump, and the other end is connected to the methanol storage tank so that the pressure of the methanol input into the first-stage booster pump is close to the pressure in the methanol storage tank.

[0009] In an embodiment of the present invention, the host supply unit further includes a second-stage pressurization return pipeline and a second-stage pressurization return regulating valve provided on the second-stage pressurization return pipeline. One end of the second-stage pressurization return pipeline is connected to the output end of the second-stage booster pump, and the other end is connected to the methanol buffer tank so that the pressure of the methanol input into the second-stage booster pump is close to the pressure in the methanol buffer tank.

[0010] In an embodiment of the present invention, the host supply unit further includes a first filter and a second filter provided on the main supply path. The input end of the first filter is connected to the methanol storage tank, and the output end is connected to the input end of the first-stage booster pump to achieve first-stage filtration. The input end of the second filter is connected to the second output end of the double-connected heat exchanger, and the output end is connected to the host to achieve second-stage filtration.

[0011] In an embodiment of the present invention, the auxiliary machine supply unit further includes a third filter. The input end of the third filter is connected to the first output end of the double-connected heat exchanger, and the output end is connected to the auxiliary machine.

[0012] In an embodiment of the present invention, the methanol fuel supply system further includes:

[0013] An auxiliary module, which includes a water glycol unit, a nitrogen unit, and a methanol emission unit. The water glycol unit is used to achieve heat exchange between water glycol and methanol through the double-connected heat exchanger so that the temperature of methanol is stabilized within a preset range; the nitrogen unit is used to inert the supply main path, the supply auxiliary path, and the filter branch connecting the second filter and the third filter; the methanol emission unit is used to collect the residual methanol discharged from the supply main path, the methanol buffer tank, the second filter, and the third filter.

[0014] In an embodiment of the present invention, the water glycol unit includes a water glycol pipeline, a hot water pipeline, and a hot water-water glycol heat exchanger disposed on both the water glycol pipeline and the hot water pipeline. A water glycol storage tank and a water glycol booster pump are disposed on the water glycol pipeline. The water glycol from the water glycol storage tank enters the hot water-water glycol heat exchanger under the action of the water glycol booster pump to exchange heat with hot water and then enters the double-connected heat exchanger to exchange heat with methanol.

[0015] In an embodiment of the present invention, the nitrogen unit includes a nitrogen source, a first nitrogen branch, a second nitrogen branch, and a third nitrogen branch. One end of the first nitrogen branch is connected to the output end of the nitrogen source, and the other end is connected to the output end of the supply main path; one end of the second nitrogen branch is connected to the output end of the nitrogen source, and the other end is connected to the supply auxiliary path; one end of the third nitrogen branch is connected to the output end of the nitrogen source, and the other end is connected to the filter branch.

[0016] In an embodiment of the present invention, the methanol emission unit includes a first emission branch, a second emission branch, a third emission branch, and a fourth emission branch. The input end of the first emission branch is connected to the first filter, the input end of the second emission branch is connected to the methanol buffer tank, the input end of the third emission branch is connected to the output end of the secondary booster pump, and the input end of the fourth emission branch is respectively connected to the second filter and the third filter.

[0017] In a second aspect, the present invention further provides a ship management system, which includes the methanol fuel supply system according to any one of the first aspect.

[0018] The methanol fuel supply system and the ship management system provided by the present invention achieve single-stage temperature regulation of methanol through the provided double-connected heat exchanger, and achieve secondary pressurization of methanol through the provided primary booster pump and secondary booster pump. At the same time, by means of single-stage temperature regulation and secondary pressurization, methanol fuel is supplied to the main engine and the auxiliary engine simultaneously, which can reduce equipment investment, make the system structure more compact, and save space. And through the provided reflux method, on the basis of ensuring the supply accuracy of methanol fuel, the anti-pressure and temperature fluctuation capabilities are improved, making the supply system have higher stability. Brief Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0020] Figure 1 is the module block diagram of the methanol fuel supply system provided by the present invention;

[0021] Figure 2 is the module block diagram of the methanol fuel supply system provided by the embodiment of the present invention;

[0022] Figure 3 is the structural schematic diagram of the methanol fuel supply system provided by the embodiment of the present invention.

[0023] Reference Signs:

[0024] 10: pressurization and temperature regulation module; 20: auxiliary module; 30: main engine; 40: auxiliary engine;

[0025] 11: main engine supply unit; 12: auxiliary engine supply unit; 13: methanol buffer tank; 14: double-connected heat exchanger;

[0026] 110: methanol storage tank; 111: main supply path; 112: primary booster pump; 113: secondary booster pump; 114: primary booster return pipeline; 115: primary booster return regulating valve; 116: secondary booster return pipeline; 117: secondary booster return regulating valve; 118: first filter; 119: second filter;

[0027] 120: supply branch path; 121: third filter; 122: regulating valve; 123: filter branch path;

[0028] 21: water glycol unit; 22: nitrogen unit; 23: methanol discharge unit;

[0029] 211: Water-glycol pipeline; 212: Hot water pipeline; 213: Water injection pipe for water-glycol storage tank; 214: Water-glycol storage tank; 215: Water-glycol booster pump; 216: Hot water - water-glycol heat exchanger; 217: Water-glycol inlet end; 218: Water-glycol outlet end; 219: Hot water inlet end; 220: Hot water outlet end;

[0030] 221: Nitrogen source; 222: First nitrogen branch; 223: Second nitrogen branch; 224: Third nitrogen branch.

[0031] 231: First discharge branch; 232: Second discharge branch; 233: Third discharge branch; 234: Fourth discharge branch. Detailed implementation manners

[0032] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0033] The terms "first", "second", etc. in the description and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such used data can be interchanged under appropriate circumstances so that the embodiments described here can be implemented in an order different from that shown or described here.

[0034] The following describes the technical terms related to the present invention:

[0035] Methanol is a saturated monohydric alcohol with the chemical formula CH3OH. Also known as "wood alcohol" or "wood spirit", it is a colorless liquid with an alcohol smell and is volatile. As a renewable energy source, methanol is considered the preferred clean fuel to replace petroleum fuels. Methanol does not require low temperature and pressure vessel storage and can be stored in a manner similar to oil products, with lower usage costs and high economy. Therefore, the research on methanol fuel supply systems is of great significance.

[0036] To solve the problem in the prior art that the marine methanol fuel supply system only considers methanol supply to the main engine and does not consider methanol supply to the auxiliary engine, or if methanol fuel supply to both the main engine and the auxiliary engine is to be achieved, it will cause too high equipment investment cost and too large space occupation. The present invention provides a methanol fuel supply system and a ship management system, which realize single-stage temperature adjustment of methanol through the provided double-connected heat exchanger, and realize secondary pressurization of methanol through the provided primary booster pump and secondary booster pump. At the same time, by means of single-stage temperature adjustment and secondary pressurization, methanol fuel supply to both the main engine and the auxiliary engine is achieved, which can reduce equipment investment, make the system structure more compact, and save space. And through the provided reflux mode, on the basis of ensuring the supply accuracy of methanol fuel, the anti-pressure and temperature fluctuation capabilities are improved, making the supply system have higher stability.

[0037] The following combines Figures 1-3 to describe the methanol fuel supply system and the ship management system of the present invention.

[0038] Please refer to Figure 1 , Figure 1 which is a block diagram of the methanol fuel supply system provided by the present invention. A methanol fuel supply system is applied to a ship management system including a main engine and an auxiliary engine. The methanol fuel supply system includes a pressurization and temperature adjustment module 10. Among them, the auxiliary engine refers to the prime mover of the marine generator set, and the auxiliary engine is relative to the main propulsion prime mover (i.e., the main engine) of the ship.

[0039] Exemplarily, the pressurization and temperature adjustment module 10 includes a main engine supply unit 11, an auxiliary engine supply unit 12, a methanol buffer tank 13, and a double-connected heat exchanger 14.

[0040] Among them, the main engine supply unit 11 includes a methanol storage tank 110 and a supply main path 111 connected to the methanol storage tank 110. A primary booster pump 112 and a secondary booster pump 113 are arranged on the supply main path 111. The auxiliary engine supply unit 12 includes a supply bypass 120. The input end of the methanol buffer tank 13 is connected to the output end of the primary booster pump 112. The first output end of the methanol buffer tank 13 is connected to the auxiliary engine supply unit 12. The second output end of the methanol buffer tank 13 is connected to the secondary booster pump 113. The first input end of the double-connected heat exchanger 14 is connected to the auxiliary engine supply unit 12. The second input end of the double-connected heat exchanger 14 is connected to the output end of the secondary booster pump 113. The first output end of the double-connected heat exchanger 14 is connected to the auxiliary engine 40. The second output end of the double-connected heat exchanger 14 is connected to the main engine 30.

[0041] The main working principle of the methanol fuel supply system of the present invention is:

[0042] The main engine supply unit 11 boosts the methanol output from the methanol storage tank 110 at the first stage through the first-stage booster pump 112 on the main supply path 111 and then inputs it into the methanol buffer tank 13. The methanol output from the methanol buffer tank 13 is divided into two paths: one path enters the dual heat exchanger 14 through the auxiliary engine supply unit 12 for temperature adjustment and then supplies the auxiliary engine 40, and the other path is boosted at the second stage by the second-stage booster pump 113 and then input into the dual heat exchanger 14 for temperature adjustment and then supplies the main engine 30.

[0043] It can be seen from this that the main engine supply unit 11 and the auxiliary engine supply unit 12 share a dual heat exchanger 14 to achieve single-stage temperature adjustment, and the methanol boosted by the first-stage booster pump 112 enters the auxiliary engine supply unit 12 through the methanol buffer tank 13 to supply methanol fuel to the auxiliary engine 40, which can meet the pressure requirement of the auxiliary engine for methanol fuel; while the methanol passing through the first-stage booster pump 112 and the second-stage booster pump 113 respectively is boosted at the second stage to supply methanol fuel to the main engine 30, which can also meet the pressure requirement of the main engine 30 for methanol fuel.

[0044] It should be noted that the pressure requirement of the main engine for methanol fuel is generally 13 - 15 bar, while the pressure requirement of the auxiliary engine for methanol fuel is generally 5 bar. And in the present invention, the methanol boosted at the first stage meets the pressure requirement of the auxiliary engine, and the methanol boosted at the second stage also meets the pressure requirement of the main engine.

[0045] Therefore, the present invention can realize the supply of methanol fuel to both the main engine and the auxiliary engine only by adopting the methods of single-stage temperature adjustment and two-stage boosting, reducing equipment investment, making the system structure more compact, and saving space.

[0046] The methanol fuel supply system of the present invention will be specifically described below through an application example.

[0047] Please refer to Figure 2 、 Figure 3 , Figure 2 which is a block diagram of the methanol fuel supply system provided by an embodiment of the present invention, Figure 3 and

[0048] is a schematic structural diagram of the methanol fuel supply system provided by an embodiment of the present invention. A methanol fuel supply system includes a boosting and temperature adjustment module 10 and an auxiliary module 20. Figure 1 Exemplarily, as

[0049] shown in Figure 2As shown in the figure, the auxiliary module 20 includes a water glycol unit 21, a nitrogen unit 22, and a methanol emission unit 23. The auxiliary module 20 is used to adjust the temperature of methanol, inject nitrogen into the methanol pipeline for inerting, and collect residual methanol.

[0050] The pressurization and temperature adjustment module 10 and the auxiliary module 20 will be specifically described below.

[0051] (1) Specific description of the pressurization and temperature adjustment module 10:

[0052] Exemplarily, the pressurization and temperature adjustment module 10 includes a main machine supply unit 11 and an auxiliary machine supply unit 12.

[0053] Among them, the main machine supply unit 11 includes a methanol storage tank 110 and a main supply path 111. A first filter 118, a primary booster pump 112, a primary booster return pipeline 114, a primary booster return regulating valve 115, a secondary booster pump 113, a secondary booster return pipeline 116, a secondary booster return regulating valve 117, and a second filter 119 are provided on the main supply path 111.

[0054] Among them, the auxiliary machine supply unit includes a secondary supply path 120, and a regulating valve 122 and a third filter 121 are provided on the secondary supply path 120.

[0055] Specifically, the output end of the methanol storage tank 110 is connected to the input end of the first filter 118, the output end of the first filter 118 is connected to the input end of the primary booster pump 112, the output end of the primary booster pump 112 is connected to the input end of the methanol buffer tank 13, the first output end of the methanol buffer tank 13 is connected to the auxiliary machine supply unit 12, and the second output end of the methanol buffer tank 13 is connected to the secondary booster pump 113. The first input end of the double - connection heat exchanger 14 is connected to the auxiliary machine supply unit 12, the second input end of the double - connection heat exchanger 14 is connected to the output end of the secondary booster pump 113, the first output end of the double - connection heat exchanger 14 is connected to the auxiliary machine 40 through the third filter 121, and the second output end of the double - connection heat exchanger 14 is connected to the main machine 30 through the second filter 119.

[0056] Based on the above connection relationship, the methanol fuel in the methanol storage tank 110 enters the supply system of the main machine 30 through the main supply path 111. Specifically, the particulate impurities in the methanol fuel are initially filtered out by the first filter 118 to obtain clean methanol fuel, and then the supply pressure of methanol is increased to 5 bar by the primary booster pump 112 and enters the methanol buffer tank 13 for storage. The methanol after primary pressurization in the methanol buffer tank 13 is on the one hand prepared for subsequent secondary pressurization, and on the other hand reaches the supply pressure (5 bar) of the auxiliary machine 40, which can prepare for the methanol supply of the auxiliary machine 40.

[0057] In some embodiments of the present invention, the host supply unit 11 further includes a primary pressurization return pipeline 114 and a primary pressurization return regulating valve 115 provided on the primary pressurization return pipeline 114. One end of the primary pressurization return pipeline 114 is connected to the output end of the primary booster pump 112, and the other end of the primary pressurization return pipeline 114 is connected to the methanol storage tank 110. The primary pressurization return pipeline 114 is used for methanol reflux, and the flow rate after primary pressurization is controlled by the primary pressurization return regulating valve 115.

[0058] In the prior art, the methanol at the output end of the primary booster pump 112 in the primary pressurization return pipeline 114 is generally directly refluxed to the input end of the primary booster pump 112, while in the present invention, the methanol at the outlet of the primary booster pump 112 in the primary pressurization return pipeline 114 is directly refluxed to the methanol storage tank 110. The effects of such a design are as follows: on the one hand, it can directly input the heat generated by the operation of the primary booster pump 112 into the storage tank, preventing the temperature of the methanol in the supply pipeline from fluctuating and exceeding the temperature limit; on the other hand, it can stabilize the pressure at the input end of the primary booster pump 112 close to the pressure of the methanol storage tank 110, reduce the system instability caused by pressure fluctuations, improve the pressurization stability of the primary booster pump 112, and make the regulation performance of the primary booster pump 112 better, faster and more sensitive.

[0059] The pressurized methanol continues to flow into the methanol buffer tank 13 through the main supply path 111. A liquid level sensor is installed at the methanol buffer tank 13 to monitor the liquid level of the methanol in the methanol buffer tank 13. Subsequently, through the secondary booster pump 113, the methanol supply pressure reaches 13 - 15 bar, which can meet the methanol fuel supply pressure of the host.

[0060] In some embodiments of the present invention, the host supply unit 11 further includes a secondary pressurization return pipeline 116 and a secondary pressurization return regulating valve 117 provided on the secondary pressurization return pipeline 116. One end of the secondary pressurization return pipeline 116 is connected to the output end of the secondary booster pump 113, and the other end of the secondary pressurization return pipeline 116 is connected to the methanol buffer tank 13. Similarly, in the present invention, the methanol at the outlet of the secondary booster pump 113 in the secondary pressurization return pipeline 116 is directly refluxed to the methanol buffer tank 13. The effects of such a design are as follows: it can receive the heat generated by the operation of the secondary booster pump 113 and stabilize the inlet pressure of the secondary booster pump 113, that is, it can make the pressure of the methanol input into the secondary booster pump 113 close to the pressure inside the methanol buffer tank 13.

[0061] In some embodiments of the present invention, the host supply unit 11 further includes a second filter 119 disposed on the supply main path 111. The input end of the second filter 119 is connected to the second output end of the dual heat exchanger 14, and the output end of the second filter 119 is connected to the host 30. The auxiliary supply unit 12 further includes a third filter 121. The input end of the third filter 121 is connected to the first output end of the dual heat exchanger 14, and the output end of the third filter 121 is connected to the auxiliary machine 40.

[0062] The methanol after being secondarily pressurized by the above-mentioned secondary booster pump 113 enters the dual heat exchanger 14, and exchanges heat with the water glycol of the water glycol unit 21 to maintain the supply temperature of the methanol at a preset temperature (for example, about 26°C). After secondary pressurization and heat exchange, the methanol can meet the requirements of the host 30 for supply pressure and temperature, and at the second filter 119, the methanol is deeply filtered to meet the requirements of the host 30 for methanol cleanliness.

[0063] The methanol fuel in the methanol buffer tank 13 enters the supply system of the auxiliary machine 40 from the supply bypass 120 at a stable pressure (for example, stable at about 5 bar), and then enters the dual heat exchanger 14 for heat exchange, so that the supply pressure and temperature reach the supply requirements of the auxiliary machine 40. The methanol after reaching the required supply pressure and temperature is further purified after passing through the third filter 121 and enters the auxiliary machine 40. The auxiliary machine 40 is provided with a regulating valve 122 for regulating the methanol flow rate entering the auxiliary machine 40. Here, the methanol fuel required by the auxiliary machine 40 is directly introduced from the methanol buffer tank 13, and the methanol buffer tank 13 has a stable pressure (for example, stable at about 5 bar). Therefore, the present invention does not need to additionally install another primary booster pump for the auxiliary supply unit 12, and the supply main path 111 and the supply bypass 120 share a dual heat exchanger 14 to adjust the temperature of the methanol, saving a single-stage heater.

[0064] (2) Specific description of the auxiliary module 20:

[0065] Exemplarily, the auxiliary module 20 includes a water glycol unit 21, a nitrogen unit 22, and a methanol discharge unit 23.

[0066] Among them, the water glycol unit 21 is used to exchange heat between water glycol and methanol through the dual heat exchanger 14 to keep the temperature of the methanol stable within a preset range, thereby stabilizing the supply temperature of the methanol.

[0067] Among them, the nitrogen unit 22 is used to inert the supply main path 111, the supply bypass 120, and the filter branch 123 connecting the second filter 119 and the third filter 121 to ensure the safety of the supply system.

[0068] Among them, the methanol emission unit 23 is used to collect the residual methanol discharged from the supply main path 111, the methanol buffer tank 13, the second filter 119, and the third filter 121, and at the same time ensures the safety of the methanol fuel supply system.

[0069] Specifically, the water glycol unit 21 includes a water glycol pipeline 211, a hot water pipeline 212, and a hot water-water glycol heat exchanger 216 provided on both the water glycol pipeline 211 and the hot water pipeline 212. A water glycol storage tank water injection pipe 213, a water glycol storage tank 214, and a water glycol booster pump 215 are provided on the water glycol pipeline 211. The water glycol from the water glycol storage tank 214 enters the hot water-water glycol heat exchanger 216 under the action of the water glycol booster pump 215 to exchange heat with hot water, and then enters the double heat exchanger 14 to exchange heat with methanol, so as to maintain the supply temperature of methanol at a preset temperature (for example, about 26 °C).

[0070] Furthermore, through PID (Proportional Integral Derivative) control, the temperature of the water glycol after heat exchange in the hot water-water glycol heat exchanger 216 can be maintained at a constant value.

[0071] Exemplarily, the nitrogen unit 22 includes a nitrogen source 221, a first nitrogen branch 222, a second nitrogen branch 223, and a third nitrogen branch 224. Among them, one end of the first nitrogen branch 222 is connected to the output end of the nitrogen source 221, and the other end is connected to the output end of the supply main path 111. One end of the second nitrogen branch 223 is connected to the output end of the nitrogen source 221, and the other end is connected to the supply auxiliary path 120. One end of the third nitrogen branch 224 is connected to the output end of the nitrogen source 221, and the other end is connected to the filter branch 123.

[0072] Due to the characteristics of low flash point, flammability, and explosiveness of methanol, after the startup and shutdown of the methanol fuel supply system, nitrogen is required to inert the pipelines of the system to ensure supply safety and the purity of methanol during supply. Nitrogen is discharged from the nitrogen source 221 and introduced into each branch. The first nitrogen branch 222 is used for inerting the supply main path 111; the second nitrogen branch 223 is used for inerting the supply auxiliary path 120; the third nitrogen branch 224 is used for inerting the filter branch 123 of the second filter 119 and the third filter 121.

[0073] Exemplarily, the methanol emission unit 23 includes a first emission branch 231, a second emission branch 232, a third emission branch 233, and a fourth emission branch 234. The input end of the first emission branch 231 is connected to the first filter 118, the input end of the second emission branch 232 is connected to the methanol buffer tank 13, the input end of the third emission branch 233 is connected to the output end of the secondary booster pump 113, and the input end of the fourth emission branch 234 is connected to the second filter 119 and the third filter 121 respectively.

[0074] Since methanol is volatile and toxic, the system also needs to collect the residual methanol in the pipeline after shutdown. The first emission branch 231 and the third emission branch 233 are used for the methanol emission of the main path 111; the second emission branch 232 is used for the methanol emission of the methanol buffer tank 13; the fourth emission branch 234 is used for the methanol emission of the duplex filter composed of the second filter 119 and the third filter 121.

[0075] In summary, the present invention can realize the fuel supply to both the main engine and the auxiliary engine simultaneously only by adopting the methods of single-stage temperature regulation and secondary pressurization, reducing the equipment investment, making the system more compact and saving space. Moreover, on the basis of accurately controlling the supply flow rate, pressure and temperature, the present invention has the ability to resist pressure and temperature fluctuations and has higher stability.

[0076] In some embodiments of the present invention, the present invention further provides a ship management system, and the ship management system includes the methanol fuel supply system as described above.

[0077] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A methanol fuel supply system, which is applied to a ship management system including a main engine and an auxiliary engine, is characterized in that, The methanol fuel supply system includes: A pressurizing and temperature-regulating module, which includes a main engine supply unit, an auxiliary engine supply unit, a methanol buffer tank, and a double-connected heat exchanger; the main engine supply unit includes a methanol storage tank and a main supply path connected to the methanol storage tank, and a first-stage booster pump and a second-stage booster pump are provided on the main supply path; the auxiliary engine supply unit includes a supply bypass; the input end of the methanol buffer tank is connected to the output end of the first-stage booster pump, the first output end of the methanol buffer tank is connected to the auxiliary engine supply unit, and its second output end is connected to the second-stage booster pump; the first input end of the double-connected heat exchanger is connected to the auxiliary engine supply unit, its second input end is connected to the output end of the second-stage booster pump, the first output end of the double-connected heat exchanger is connected to the auxiliary engine, and its second output end is connected to the main engine; The main engine supply unit pressurizes the methanol output from the methanol storage tank by the first-stage booster pump on the main supply path and then inputs it into the methanol buffer tank. The methanol output from the methanol buffer tank is divided into two paths: one path enters the double-connected heat exchanger through the auxiliary engine supply unit for temperature regulation and then supplies the auxiliary engine, and the other path is pressurized by the second-stage booster pump and then input into the double-connected heat exchanger for temperature regulation and then supplies the main engine; the main engine supply unit and the auxiliary engine supply unit share the double-connected heat exchanger to achieve single-stage temperature regulation.

2. The methanol fuel supply system according to claim 1, characterized in that, The main engine supply unit further includes a first-stage booster return pipeline and a first-stage booster return regulating valve provided on the first-stage booster return pipeline. One end of the first-stage booster return pipeline is connected to the output end of the first-stage booster pump, and the other end is connected to the methanol storage tank so that the pressure of the methanol input into the first-stage booster pump is close to the pressure in the methanol storage tank.

3. The methanol fuel supply system according to claim 1 or 2, characterized in that, The main engine supply unit further includes a second-stage booster return pipeline and a second-stage booster return regulating valve provided on the second-stage booster return pipeline. One end of the second-stage booster return pipeline is connected to the output end of the second-stage booster pump, and the other end is connected to the methanol buffer tank so that the pressure of the methanol input into the second-stage booster pump is close to the pressure in the methanol buffer tank.

4. The methanol fuel supply system according to claim 3, characterized in that, The main engine supply unit further includes a first filter and a second filter provided on the main supply path. The input end of the first filter is connected to the methanol storage tank, and its output end is connected to the input end of the first-stage booster pump to achieve first-stage filtration. The input end of the second filter is connected to the second output end of the double-connected heat exchanger, and its output end is connected to the main engine to achieve second-stage filtration.

5. The methanol fuel supply system according to claim 4, characterized in that, The auxiliary engine supply unit further includes a third filter. The input end of the third filter is connected to the first output end of the double-connected heat exchanger, and its output end is connected to the auxiliary engine.

6. The methanol fuel supply system according to claim 5, characterized in that, The methanol fuel supply system further includes: The auxiliary module includes a water-glycol unit, a nitrogen unit, and a methanol emission unit. The water-glycol unit is used to achieve heat exchange between water-glycol and methanol through the double-tube heat exchanger so that the temperature of methanol is stabilized within a preset range; the nitrogen unit is used to inert the supply main path, the supply auxiliary path, and the filter branch connecting the second filter and the third filter; the methanol emission unit is used to collect the residual methanol discharged from the supply main path, the methanol buffer tank, the second filter, and the third filter.

7. The methanol fuel supply system according to claim 6, characterized in that, The water-glycol unit includes a water-glycol pipeline, a hot water pipeline, and a hot water-water glycol heat exchanger disposed on both the water-glycol pipeline and the hot water pipeline. A water-glycol storage tank and a water-glycol booster pump are provided on the water-glycol pipeline. The water-glycol from the water-glycol storage tank enters the hot water-water glycol heat exchanger under the action of the water-glycol booster pump, exchanges heat with hot water, and then enters the double-tube heat exchanger to exchange heat with methanol.

8. The methanol fuel supply system according to claim 6, characterized in that, The nitrogen unit includes a nitrogen source, a first nitrogen branch, a second nitrogen branch, and a third nitrogen branch. One end of the first nitrogen branch is connected to the output end of the nitrogen source, and the other end is connected to the output end of the supply main path; one end of the second nitrogen branch is connected to the output end of the nitrogen source, and the other end is connected to the supply auxiliary path; One end of the third nitrogen branch is connected to the output end of the nitrogen source, and the other end is connected to the filter branch.

9. The methanol fuel supply system according to claim 6, wherein The methanol emission unit includes a first emission branch, a second emission branch, a third emission branch, and a fourth emission branch. The input end of the first emission branch is connected to the first filter, the input end of the second emission branch is connected to the methanol buffer tank, the input end of the third emission branch is connected to the output end of the secondary booster pump, and the input end of the fourth emission branch is respectively connected to the second filter and the third filter.

10. A ship management system, characterized in that, The ship management system includes the methanol fuel supply system according to any one of claims 1 to 9.

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