Marine methanol supply system

Abstract

The invention discloses a marine methanol supply system which comprises a methanol cabin and an engine, the methanol cabin is connected with a coarse filter through a main valve pipeline, the coarse filter is connected with a supply pump through a pipeline, an outlet pipeline of the supply pump is connected with a fine filter, and the fine filter is connected with an engine pipeline through a pressure regulating valve. An outlet of the fine filter is connected with a methanol cabin pipeline through a pressure release valve, and an inlet pipeline of the coarse filter is connected with a nitrogen inerting system for purging the pipeline, so that the safety risk in the system is reduced, and the stable operation of the system is guaranteed; an outlet pipeline of the supply pump is connected with a surge tank, the upper end of the surge tank is communicated with a pipeline of the nitrogen inerting system through a first electronic ball valve, and a heat exchange system for adjusting the temperature of methanol is mounted between the coarse filter and the fine filter, so that the methanol supply pressure and temperature of the methanol supply system are constant; and a good conveying state of methanol and safe and stable operation of the system are ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of marine energy supply, in particular to a marine methanol supply system. BACKGROUND

[0002] Under the background of global shipping industry green transformation, methanol, as a clean and efficient alternative fuel, has gradually become a popular choice for ship power fuel due to its lower sulfur oxides, nitrogen oxides and particulate matter emissions, as well as the potential to significantly reduce carbon dioxide emissions.

[0003] The existing system lacks precise control and real-time monitoring mechanism for key parameters (such as temperature, pressure) in the methanol supply process, making it difficult to achieve efficient utilization of methanol, increasing the cost of ship operation and environmental burden. SUMMARY

[0004] In order to overcome the deficiencies of the prior art, the present application provides a marine methanol supply system.

[0005] The technical scheme adopted by the present application to solve its technical problems is: A marine methanol supply system, comprising a methanol tank and an engine, the methanol tank is connected with a coarse filter through a total valve pipeline, the coarse filter is connected with a supply pump through a pipeline, the outlet of the supply pump is connected with a fine filter through a pipeline, the fine filter is connected with the engine through a pipeline by a pressure regulating valve, the outlet of the fine filter is connected with the methanol tank through a pipeline by a pressure relief valve, the inlet of the coarse filter is connected with a nitrogen inerting system for purging pipeline, the outlet of the supply pump is connected with a pressure stabilizing tank, the upper end of the pressure stabilizing tank is communicated with the pipeline of the nitrogen inerting system through a first electronic ball valve, a heat exchange system for adjusting the temperature of methanol is installed between the coarse filter and the fine filter.

[0006] The outlet of the fine filter is provided with a second main pipeline and a second auxiliary pipeline in parallel, the outlet of the fine filter is connected with the second main pipeline and the second auxiliary pipeline through a tee pipe fitting, the pressure regulating valve is arranged on the second main pipeline, and the pressure relief valve is arranged on the second auxiliary pipeline.

[0007] The second main pipeline comprises a first emergency pneumatic valve, the pressure regulating valve and a fourth manual ball valve, the second auxiliary pipeline comprises a second emergency pneumatic valve and the pressure relief valve, and the inlet of the engine is provided with an adjusting valve with an adjustable opening degree, and the fourth manual ball valve, the second emergency pneumatic valve, the pressure relief valve and the adjusting valve are communicated through a four-way pipe fitting.

[0008] A first pressure sensor is connected to the outlet of the second emergency pneumatic valve, and the first pressure sensor is connected with the four-way pipe fitting.

[0009] The total valve is connected with the coarse filter through a first electronic ball valve, a first main pipeline and a first auxiliary pipeline are arranged between the supply pump and the fine filter in parallel, the first main pipeline and the first auxiliary pipeline respectively comprise a second manual ball valve and a third manual ball valve, and the outlet of the supply pump is connected with the second manual ball valve and the third manual ball valve through a three-way pipe.

[0010] The nitrogen inerting system comprises a nitrogen tank group, and a third pressure sensor is connected with the outlet of the nitrogen tank group.

[0011] The outlet of the nitrogen tank group is connected with the inlet pipeline of the coarse filter through a first manual ball valve.

[0012] A fourth pressure sensor connected with the first electronic ball valve is arranged between the pressure stabilizing tank and the first electronic ball valve.

[0013] A first safety valve is connected with the top of the pressure stabilizing tank, and the outlet pressure of the first safety valve is 0.6 MPa.

[0014] The beneficial effects of the present application are: The system is provided with a supply pump to improve the pressure of methanol, and finally the pressure entering the engine is adjusted through a pressure regulating valve to improve the efficiency and stability of the engine, when the pressure of the methanol supply pipeline is too low, the frequency of the supply pump is increased to ensure the pressure of the supply pipeline, and when the pressure of the methanol supply pipeline is too high, the methanol is returned to the methanol cabin through a pressure relief valve to realize the constant supply of alcohol pressure.

[0015] The system is provided with a pressure stabilizing tank at the outlet of the supply pump, when the frequency of the supply pump is adjusted too high or too low, the pressure stabilizing tank maintains the pressure of the entire methanol supply pipeline, when the pressure in the pressure stabilizing tank is lower than the preset value, nitrogen is transported to the pressure stabilizing tank through the first electronic ball valve of the nitrogen inerting system to increase the internal pressure, thereby ensuring the function of maintaining the pressure of the supply pipeline.

[0016] The system is provided with a nitrogen inerting system, before the system is started, the nitrogen inerting system is used for inert blowing treatment of the entire supply pipeline to displace the air possibly existing in the supply pipeline, reduce the safety risk in the system, and ensure stable operation of the system.

[0017] The system is provided with a heat exchange system for adjusting the temperature of methanol, methanol is a liquid at normal temperature and pressure, when the ambient temperature is lower than 20 DEG C or higher than 40 DEG C, the temperature of methanol in the supply pipeline is adjusted by the heat exchange system to ensure good delivery state of methanol and safe and stable operation of the system, make methanol fully burn in the engine, improve energy utilization rate, reduce harmful gas emission, and help green navigation of ships. BRIEF DESCRIPTION OF DRAWINGS

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0019] Figure 1 This is one of the pipeline schematic diagrams of the present invention (dual system structure); Figure 2 This is the second schematic diagram of the pipeline of the present invention (single system structure). Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings. It should be noted that, unless otherwise specified, the embodiments and features described herein can be combined with each other.

[0021] It should be understood that these descriptions are merely exemplary and are not intended to limit the scope of the invention.

[0022] The following describes some embodiments of the present invention with reference to the accompanying drawings.

[0023] Reference Figure 1 , 2 A marine methanol supply system includes a methanol tank 1 and an engine 2. The methanol tank 1 is connected to a coarse filter 3 via a main valve 13. The coarse filter 3 is connected to a supply pump 4 via a main valve 13. The outlet pipe of the supply pump 4 is connected to a fine filter 5. The fine filter 5 is connected to the engine 2 via a pressure regulating valve 6. The outlet of the fine filter 5 is connected to the methanol tank 1 via a pressure relief valve 10. After being filtered by the coarse filter 3, the methanol is pressurized by the supply pump 4, and finally the pressure is adjusted to 0.5±0.05MPa by the pressure regulating valve 6 before entering the engine 2. This improves the efficiency and stability of the engine 2. When the pressure in the methanol supply pipeline is too low, the frequency of the supply pump 4 is increased to ensure the pressure in the supply pipeline. If the pressure in the methanol supply pipeline is too high, the methanol flows back into the methanol tank 1 through the pressure relief valve 10, achieving a constant methanol supply pressure, optimizing the combustion process, and ensuring system safety. From injection accuracy to anti-vapor lock capability, and from environmental protection to reliability, pressure stability is the foundation for the efficient operation of the methanol system.

[0024] When methanol pressure is stable, the opening time of the fuel injector is linearly related to the fuel injection quantity. Quantitative fuel supply can be achieved by precisely controlling the fuel injection pulse width, avoiding fuel injection quantity deviations caused by pressure fluctuations. When the engine is at high speed or under heavy load, the fuel injection quantity needs to be increased to provide more energy. Stable fuel supply pressure can ensure that the fuel injector can maintain linear flow growth even with a large pulse width, avoiding the phenomenon of "insufficient fuel supply" caused by pressure decay.

[0025] The outlet of the fine filter 5 is provided with a parallel second main pipeline 14 and a second auxiliary pipeline 15, the outlet of the fine filter 5 is connected with the second main pipeline 14 and the second auxiliary pipeline 15 through a tee pipe, the pressure regulating valve 6 is arranged on the second main pipeline 14, and the pressure relief valve 10 is arranged on the second auxiliary pipeline 15.

[0026] Further, the second main pipeline 14 comprises a first emergency pneumatic valve 20, the pressure regulating valve 6 and a fourth manual ball valve 21, the second auxiliary pipeline 15 comprises a second emergency pneumatic valve 22 and the pressure relief valve 10, and the inlet of the engine 2 is provided with an adjusting valve 16 with an adjustable opening degree, which is used for controlling the amount of methanol entering the engine 2; the fourth manual ball valve 21, the second emergency pneumatic valve 22, the pressure relief valve 10 and the adjusting valve 16 are communicated through a four-way pipe.

[0027] Further, a first pressure sensor 23 is connected to the outlet of the second emergency pneumatic valve 22, and the first pressure sensor 23 is connected with the four-way pipe, that is, the first pressure sensor 23 can detect the pressure of the second main pipeline 14 and the second auxiliary pipeline 15, and when the detected pressure is too large, the pressure relief valve 10 is controlled to be opened.

[0028] Under normal use, the second emergency pneumatic valve 22 is closed, the first emergency pneumatic valve 20, the pressure regulating valve 6 and the fourth manual ball valve 21 are opened, that is, the second main pipeline 14 is conducted, and the methanol enters the engine 2 through the second main pipeline 14 and the adjusting valve 16; the inlet of the engine 2 is provided with a second pressure sensor 24, when the pressure detected by the second pressure sensor 24 is not within the range of 0.5±0.05 MPa, the adjusting valve 16 is controlled to be adjusted through a control program, so that the pressure of the methanol entering the engine 2 is maintained within the range of 0.5±0.05 MPa, and when the pressure of the methanol is higher than the set value of the pressure relief valve 10, the methanol flows back to the methanol tank 1 through the pressure relief valve 10.

[0029] When the pressure regulating valve 6 fails, the first emergency pneumatic valve 20 and the fourth manual ball valve 21 are closed, so that the pressure regulating valve 6 can be repaired and replaced.

[0030] When the second main pipeline 14 fails, the first emergency pneumatic valve 20 is closed, the second emergency pneumatic valve 22 is opened, the second main pipeline 14 is closed, the second auxiliary pipeline 15 is conducted, and the normal operation of the methanol supply pipeline is temporarily maintained; when the maintenance of the second main pipeline 14 is completed, the second main pipeline 14 is conducted again, and the second auxiliary pipeline 15 is closed.

[0031] When the second sub-pipeline 15 is open, methanol enters the engine 2 through the regulating valve 16, and when the methanol pressure is too high, it also returns to the methanol tank 1 through the pressure relief valve 10.

[0032] Further, the first emergency pneumatic valve 20 and the second emergency pneumatic valve 22 are electronic valves, different sensors are arranged on the pipeline to detect whether the pipeline is normal, such as leakage, such sensors can be directly purchased, and according to the actual demand, when the second main pipeline 14 and the second sub-pipeline 15 are detected to have problems, the first emergency pneumatic valve 20 and the second emergency pneumatic valve 22 are directly controlled to be closed, to avoid causing greater danger.

[0033] The total valve 13 is connected with the coarse filter 3 through the first electronic ball valve 17, the supply pump 4 and the fine filter 5 are provided with the first main pipeline 11 and the first sub-pipeline 12 in parallel, the first main pipeline 11 and the first sub-pipeline 12 can only be connected with one of them, generally the first main pipeline 11 is connected, the first sub-pipeline 12 is in a normally closed state, the first main pipeline 11 and the first sub-pipeline 12 respectively include the second manual ball valve 18 and the third manual ball valve 19, the outlet of the supply pump 4 is connected with the second manual ball valve 18 and the third manual ball valve 19 through a tee joint, in a normal case, the third manual ball valve 19 is closed, and the second manual ball valve 18 is opened, when the first main pipeline 11 fails, the second manual ball valve 18 is manually closed, and the third manual ball valve 19 is opened, so that the first sub-pipeline 12 is used instead of the first main pipeline 11 to work, and the first main pipeline 11 is repaired, when the repair is completed, the first main pipeline 11 is used again.

[0034] The coarse filter 3 and the fine filter 5 are provided with a heat exchange system 9 for adjusting the temperature of methanol, which is mainly used for heating or cooling the methanol in the first main pipeline 11 and the first sub-pipeline 12.

[0035] In this embodiment, the first main pipeline 11 is the main pipeline, and the first sub-pipeline 12 is the emergency management, the working time of the first sub-pipeline 12 is not long, therefore the heat exchange system 9 only heats or cools the methanol in the first main pipeline 11, reduces the cost of production, and is only suitable for regions such as southern regions where the temperature is maintained at 10-30℃ all year round, if the environmental temperature is relatively extreme, such as subzero temperature, the heat exchange system 9 also needs to exchange heat for the first sub-pipeline 12.

[0036] Methanol is a liquid at room temperature and normal pressure. When the ambient temperature is lower than 20℃, the flowability of methanol will become poor. In the methanol supply pipeline of a ship, low temperature can cause the increase of methanol viscosity, the decrease of flow rate, and even the condensation phenomenon, which can block the pipeline. If in the engine, high viscosity of methanol can cause poor injection effect of the fuel injection nozzle, poor atomization, and thus affect the combustion efficiency. In addition, at low temperature, the vapor pressure of methanol is low, which can not be easily gasified, resulting in too lean mixture, incomplete combustion, and even difficult starting. Or when the temperature is higher than 40℃, the volatility of methanol will significantly increase. In the closed supply pipeline, the large amount of volatilization of methanol can cause the pressure in the pipeline to rise sharply, which can cause the sealing failure of the pipeline connection, causing methanol leakage. The leaked methanol not only causes fuel waste, but also brings fire, explosion and other serious safety hazards due to its flammability. In addition, the vapor pressure of methanol will significantly increase, which can easily cause gas blocking phenomenon, that is, bubbles are formed in the pipeline, which can block the flow of liquid and affect the stability of the fuel supply system. Especially in the high-temperature environment of the engine compartment, it can cause fuel supply interruption and engine stall. In addition, at high temperature, the chemical activity of methanol increases, which can more easily cause oxidation reaction to generate corrosive substances such as formic acid, which can cause corrosion to the pipeline and equipment. The temperature of the methanol in the supply pipeline is adjusted by the heat exchange system to ensure the good delivery state of the methanol and the safe and stable operation of the system, so that the methanol can be fully combusted in the engine, improve the energy utilization rate, reduce the operating cost of the ship, and reduce harmful gas emissions to help green navigation of the ship.

[0037] The inlet pipeline of the coarse filter 3 is connected with a nitrogen inerting system for purging the pipeline, which comprises a nitrogen tank group 25. The outlet of the nitrogen tank group 25 is connected with a third pressure sensor 26. The outlet pressure of the nitrogen tank group 25 is required to be 0.6-0.8 MPa, which can ensure the purging treatment of the methanol supply pipeline with an internal pressure of 0.5±0.05 MPa. The outlet of the nitrogen tank group 25 is connected with the inlet pipeline of the coarse filter 3 through a first manual ball valve 27. When purging treatment is needed, the first manual ball valve 27 is opened, and after completion, the first manual ball valve 27 is closed.

[0038] Before the system is started, the entire supply pipeline is inertly purged by the nitrogen inerting system to displace the air that may exist in the supply pipeline, reduce the safety risk in the system, and ensure the stable operation of the system.

[0039] Methanol flowing in the pipeline may generate static electricity, if there is air in the pipeline, static spark may ignite methanol vapor, after nitrogen purging, inert environment can avoid static electricity caused by explosion accident, in addition, the acid such as formic acid generated by methanol oxidation will corrode the metal pipeline (such as carbon steel), shorten the service life of the equipment, nitrogen inerting can inhibit the oxidation reaction, reduce the generation of corrosive substances, reduce the risk of pipeline leakage and equipment damage, the air in the pipeline may contain moisture, dust and other impurities, which may form a gel or crystal after mixing with methanol, nitrogen purging can keep the pipeline clean and avoid impurities deposition causing pipeline blockage or valve jam.

[0040] When the pipeline needs to be overhauled, replace parts or fire operation, the nitrogen inerting system can purge the pipeline in advance, remove the residual methanol vapor and air, reduce the difficulty and risk of manual cleaning, improve the overhaul efficiency, ensure the safety of the overhaul personnel, and avoid explosion during the fire.

[0041] The outlet pipe of the supply pump 4 is connected with a pressure stabilizing tank 7, the upper end of the pressure stabilizing tank 7 is communicated with the pipeline of the nitrogen inerting system through a first electronic ball valve 8, a fourth pressure sensor 28 connected with the first electronic ball valve 8 is installed between the pressure stabilizing tank 7 and the first electronic ball valve 8, when the frequency of the supply pump 4 is adjusted too high or too low, the pressure of the entire methanol supply pipeline is maintained by the pressure stabilizing tank 7, avoiding the impact of sudden change of methanol pressure on the entire supply pipeline, when the fourth pressure sensor 28 detects that the pressure in the pressure stabilizing tank 7 is lower than the preset value, the first electronic ball valve 8 is opened, nitrogen gas is delivered to the pressure stabilizing tank 7 by the nitrogen inerting system to increase the internal pressure of the pressure stabilizing tank 7, when the preset value is reached, the first electronic ball valve 8 is closed, thereby ensuring its role in maintaining the pressure of the supply pipeline.

[0042] Further, the pressure stabilizing tank 7 includes a liquid zone at the bottom and a gas zone at the top, the liquid zone is communicated with the methanol supply pipeline, and the nitrogen gas delivered by the nitrogen inerting system is delivered into the gas zone to provide the pressure in the pressure stabilizing tank 7, the gas zone is connected with a first safety valve 29, the exhaust pressure of the first safety valve is 0.6 MPa, when the nitrogen gas delivered by the nitrogen inerting system is too much, the pressure in the pressure stabilizing tank 7 is greater than 0.6 MPa, the excess gas will be discharged through the first safety valve 29, avoiding excessive pressure impacting the methanol supply pipeline.

[0043] In the application, the pipeline at the outlet of the supply pump 4, the pipeline for returning methanol to the methanol tank 1 and the pipeline before the regulating valve 16 are all provided with safety valves, wherein the pipeline at the outlet of the supply pump 4 and the pipeline for returning methanol to the methanol tank 1 can share one safety valve, which is the second safety valve 30, the discharge pressure of the second safety valve 30 is 0.6 MPa, and the pipeline before the regulating valve 16 is provided with the third safety valve 31, the discharge pressure of the third safety valve 31 is 0.6 MPa or 0.56 MPa, that is, when the pressure of methanol entering the engine 2 exceeds the set 0.5±0.05 MPa, part of the gas is output through the third safety valve 31 to reduce the pressure of methanol entering the engine 2.

[0044] In the application, the above-mentioned methanol supply pipeline can be provided with one set or two sets, and the engine 2 is correspondingly provided with one or two, in the two sets of methanol supply pipelines, the pipeline before the regulating valve 16 is connected through the pneumatic cut-off valve 32, under normal use, each set of methanol supply pipeline mainly supplies methanol to one of the engines, if one set of methanol supply pipeline fails and cannot be used, the pneumatic cut-off valve 32 can be opened, so that the other set of methanol supply pipeline can supply methanol to the two engines.

[0045] In the present application, the term "a plurality of" refers to two or more, unless otherwise explicitly limited. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items. The terms "mounting", "connecting", "connecting", "fixing" and the like should be interpreted in a broad sense, for example, "connecting" can be fixed connection, or detachable connection, or integral connection; "connecting" can be direct connection, or indirect connection through intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0046] It should be noted that when an element is referred to as "assembled with", "mounted with", "fixed with" or "provided with" another element, it can be directly on another element or there can be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to another element or there can be a middle element. The terms "vertical", "horizontal", "up", "down", "left", "right" and similar expressions used herein are for illustrative purposes only and are not the only embodiment.

[0047] In the description of the specification, the description of the terms "one embodiment", "some embodiments", "certain embodiments", and the like are intended to indicate that the described implementation, feature, structure, material or characteristic is included in at least one embodiment or example of the application. In the description of the specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Also, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in an appropriate manner.

[0048] Although embodiments of the present application have been shown and described, it would be appreciated by those skilled in the art that changes, modifications, alternatives and variations to these embodiments could be made without departing from the principles and spirit of the application, the scope of which is defined by the claims and their equivalents.

Claims

1. A marine methanol supply system, comprising a methanol tank (1) and an engine (2), characterized in that... The methanol tank (1) is connected to a coarse filter (3) via a main valve (13). The coarse filter (3) is connected to a supply pump (4). The outlet of the supply pump (4) is connected to a fine filter (5). The fine filter (5) is connected to the engine (2) via a pressure regulating valve (6). The outlet of the fine filter (5) is connected to the methanol tank (1) via a pressure relief valve (10). The inlet of the coarse filter (3) is connected to a nitrogen inerting system for purging the pipeline. The outlet of the supply pump (4) is connected to a pressure stabilizing tank (7). The upper end of the pressure stabilizing tank (7) is connected to the pipeline of the nitrogen inerting system via a first electronic ball valve (8). A heat exchange system (9) for adjusting the methanol temperature is installed between the coarse filter (3) and the fine filter (5).

2. The marine methanol supply system according to claim 1, characterized in that... The outlet of the fine filter (5) is provided with a second main pipeline (14) and a second auxiliary pipeline (15) in parallel. The outlet of the fine filter (5) is connected to the second main pipeline (14) and the second auxiliary pipeline (15) through a tee fitting. The pressure regulating valve (6) is provided on the second main pipeline (14), and the pressure relief valve (10) is provided on the second auxiliary pipeline (15).

3. The marine methanol supply system according to claim 2, characterized in that... The second main pipeline (14) includes a first emergency pneumatic valve (20), the pressure regulating valve (6), and a fourth manual ball valve (21). The second auxiliary pipeline (15) includes a second emergency pneumatic valve (22) and a pressure relief valve (10). The inlet of the engine (2) is equipped with a regulating valve (16) for adjusting the opening. The fourth manual ball valve (21), the second emergency pneumatic valve (22), the pressure relief valve (10), and the regulating valve (16) are connected by a four-way fitting.

4. The marine methanol supply system according to claim 3, characterized in that... The outlet of the second emergency pneumatic valve (22) is connected to a first pressure sensor (23), which is connected to the four-way fitting.

5. The marine methanol supply system according to claim 1, characterized in that... The main valve (13) is connected to the coarse filter (3) via a first electronic ball valve (17). A first main pipeline (11) and a first auxiliary pipeline (12) are arranged in parallel between the supply pump (4) and the fine filter (5). The first main pipeline (11) and the first auxiliary pipeline (12) include a second manual ball valve (18) and a third manual ball valve (19), respectively. The outlet of the supply pump (4) is connected to the second manual ball valve (18) and the third manual ball valve (19) via a three-way fitting.

6. The marine methanol supply system according to claim 1, characterized in that... The nitrogen inerting system includes a nitrogen tank assembly (25), the outlet of which is connected to a third pressure sensor (26).

7. The marine methanol supply system according to claim 6, characterized in that... The outlet of the nitrogen tank assembly (25) is connected to the inlet pipe of the coarse filter (3) via a first manual ball valve (27).

8. The marine methanol supply system according to claim 1, characterized in that... A fourth pressure sensor (28) connected to the first electronic ball valve (8) is installed between the pressure stabilizing tank (7) and the first electronic ball valve (8).

9. The marine methanol supply system according to claim 8, characterized in that... The top of the pressure stabilizing tank (7) is connected to a first safety valve (29), and the exhalation pressure of the first safety valve (29) is 0.6 MPa.

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