CN114320686B - Marine methanol fuel supply method - Google Patents
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- CN114320686B CN114320686B CN202210013162.3A CN202210013162A CN114320686B CN 114320686 B CN114320686 B CN 114320686B CN 202210013162 A CN202210013162 A CN 202210013162A CN 114320686 B CN114320686 B CN 114320686B
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Abstract
The application provides a marine methanol fuel supply method, adopts marine methanol fuel supply system, the system includes: a methanol storage tank, a methanol supply unit, a fuel valve unit, a methanol engine and a methanol recovery unit which are sequentially connected in series through a methanol fuel supply pipeline; and the methanol recovery unit is connected back to the methanol storage tank, the methanol recovery unit comprises a liquid return main valve, a second flowmeter, a heat exchanger and a temperature transmitter which are sequentially connected in series, the methanol engine is connected with the liquid return main valve through a front-end liquid return pipeline, and the temperature transmitter is connected with the methanol storage tank through a rear-end liquid return pipeline. According to the marine methanol fuel supply method, the methanol fuel which is not used by the methanol engine is returned to the methanol storage tank through the methanol recovery unit, so that the recovery and reuse of the methanol fuel are realized, and the waste of the methanol fuel is reduced. Moreover, the marine methanol fuel supply system is simple in design and high in safety.
Description
Technical Field
The application relates to the technical field of ship shipping, in particular to a marine methanol fuel supply method of a marine methanol engine.
Background
Marine alternative fuels are of many types, mainly methanol, LNG, biofuels, hydrogen, battery fuels and the like; wherein, the yield of the methanol in China is more than 60 percent of the global productivity, and the methanol is the country with the maximum production and consumption of the global methanol. And the methanol fuel can meet the emission regulations of GB 15097-2016 inland river. IMO considers that methanol is taken as a marine alternative fuel, and is a scheme capable of meeting the sulfur limiting requirement of IMO 2020.
With the continuous increase of market demands of global methanol fuel ships, methanol has become a global available ship fuel, and among ports ranked 100 in the world, more than 88 ports can be used as methanol fuel, and the methanol has the advantages of cleanness, environmental protection, strong availability and the like, and has fully shown the potential of becoming a future ship fuel. Marine fuels have also become one of the emerging fields of using methanol fuels.
Methanol is a transparent, water-soluble and biodegradable liquid, does not need to be stored in a low-temperature and pressure container, can be stored in a similar oil product mode, and is convenient to store and transport. Compared with the traditional fuel, the methanol fuel has lower use cost and high economy.
At present, a methanol fuel supply system is mainly used for an ME-GI and ME-LGI type low-speed dual-fuel engine of a MAN, and the system is used for conveying methanol fuel to the engine through a methanol fuel temporary storage container, a methanol fuel supply unit, a methanol fuel valve group and a pilot oil supply unit which are sequentially communicated, so that a methanol liquid return unit is not needed, and the waste of the methanol fuel is easily caused for medium-speed and high-speed models.
Disclosure of Invention
The purpose of the present application is to provide a marine methanol fuel supply method that can recover excess methanol fuel to reduce waste.
To achieve the above object, the present application provides a methanol fuel supply system for a ship, comprising: a methanol storage tank, a methanol supply unit, a fuel valve unit, a methanol engine and a methanol recovery unit which are sequentially connected in series through a methanol fuel supply pipeline; and the methanol recovery unit is connected back to the methanol storage tank, the methanol recovery unit comprises a liquid return main valve, a second flowmeter, a heat exchanger and a temperature transmitter which are sequentially connected in series, the methanol engine is connected with the liquid return main valve through a front-end liquid return pipeline, and the temperature transmitter is connected with the methanol storage tank through a rear-end liquid return pipeline.
Further, the methanol recovery unit further comprises a heat exchange water inlet and a heat exchange water outlet, wherein the heat exchange water inlet and the heat exchange water outlet are connected with the heat exchanger.
Further, the methanol supply unit comprises a methanol pump, a first pressure transmitter and a fuel main valve which are sequentially connected in series; the methanol pump is connected with the methanol storage tank, and the fuel main valve is connected with the fuel valve group unit through the methanol fuel supply pipeline; the methanol pump pumps out the methanol fuel in the methanol storage tank and then sends the methanol fuel to the fuel valve group unit through the fuel main valve.
Further, the methanol supply unit further comprises a pressure control valve, one end of the pressure control valve is connected between the first pressure transmitter and the main fuel valve, the other end of the pressure control valve is connected between the methanol storage tank and the methanol pump through a bypass pipeline, and when the pressure behind the methanol pump exceeds the set value of the pressure control valve, methanol fuel is automatically returned to the upstream of the methanol pump.
Further, the fuel valve group unit and the methanol engine are arranged in the engine room together, and methanol fuel supply pipelines between the fuel valve group unit and the methanol engine, between the fuel valve group unit and the methanol supply unit and between the methanol engine and the methanol recovery unit in the engine room are double-wall outer pipes.
Further, the fuel valve group unit comprises a manual valve, a second pressure transmitter, a first filter, a liquid supply main valve, a third pressure transmitter, a first flowmeter, a pressure regulating valve and a fourth pressure transmitter which are sequentially connected in series, wherein the manual valve, the second pressure transmitter, the filter, the liquid supply main valve, the third pressure transmitter, the first flowmeter, the pressure regulating valve and the fourth pressure transmitter are integrated in a closed container, the inside is a dangerous area, and the outside is a safe area.
Further, a liquid level switch is arranged at the bottom of the container.
Further, the marine methanol fuel supply system further comprises a methanol filling unit, the methanol filling unit comprises a liquid phase filling pipeline and a gas phase return pipeline, the liquid phase filling pipeline and the gas phase return pipeline are connected with the methanol storage tank, the liquid phase filling pipeline comprises a liquid phase filling port, a liquid phase filling valve and a second filter which are sequentially connected in series, and the gas phase return pipeline comprises a gas phase return valve and a gas phase return port which are sequentially connected in series.
Further, the marine methanol fuel supply system further comprises an exhaust pipeline, wherein the exhaust pipeline comprises an exhaust valve and an exhaust port which are sequentially connected in series.
Further, the marine methanol fuel supply system further comprises a first nitrogen purging interface, a second nitrogen purging interface and a third nitrogen purging interface; the first nitrogen purging interface is arranged at the liquid phase filling port and the gas phase air return port; the second nitrogen purging interface is arranged behind the fuel main valve; the third nitrogen purging interface is arranged behind the liquid supply main valve.
The application also provides a marine methanol fuel supply method, which adopts the marine methanol fuel supply system, and comprises the steps of: starting a methanol pump, opening a fuel main valve, enabling methanol fuel to flow to a fuel valve group unit, enabling the methanol fuel to flow through a manual valve, and enabling the methanol fuel liquid filtered by a first filter to flow to a liquid supply main valve; opening a liquid supply main valve and a liquid return main valve, and supplying the methanol fuel liquid to a methanol engine after the methanol fuel liquid flows through a first flowmeter and is regulated by a pressure regulating valve; the methanol fuel liquid which is not used by the methanol engine flows to the methanol recovery unit through the front-end liquid return pipeline, passes through the liquid return main valve and the second flowmeter, takes away excessive heat through the heat exchanger, and finally flows to the methanol storage tank through the rear-end liquid return pipeline.
Further, the liquid supply flow further comprises: and when the pressure of the liquid supply pipeline behind the methanol pump reaches the set value of the pressure control valve, the methanol fuel liquid flows back to the inlet pipeline of the methanol pump from the bypass pipeline.
Further, the method may further comprise normally stopping the flow of the feed stream: and closing the methanol pump, the fuel main valve and the liquid supply main valve, keeping the liquid return main valve open, and stopping liquid supply.
Further, the method also includes emergency stopping the flow of the feed stream: when the methanol engine is stopped due to the emergency of the fault or the system monitors the fault such as methanol fuel leakage, the methanol pump and the main fuel valve are immediately closed, the main liquid supply valve and the main liquid return valve are kept open, and liquid supply is stopped.
Further, the method also comprises a methanol filling flow: opening a liquid phase filling valve and a gas phase return valve, injecting the methanol fuel liquid from the liquid phase filling port, flowing through the liquid phase filling valve, filtering the liquid phase methanol through a second filter, entering a methanol storage tank, and flowing out the gas phase methanol in the methanol storage tank from the gas phase return pipeline through the gas phase return valve and the gas phase return port along with the injection of the methanol fuel liquid, so as to ensure the pressure balance in the methanol storage tank in the filling process.
Further, the method also comprises a nitrogen purging flow, wherein the nitrogen purging flow comprises a first nitrogen purging flow, a second nitrogen purging flow and a third nitrogen purging flow:
the first nitrogen purge flow includes: introducing nitrogen from a first nitrogen purging interface to purge, sequentially opening a liquid phase filling valve, a gas phase filling valve and a gas phase air return pipeline, wherein the nitrogen purges a liquid phase filling pipeline and a gas phase air return pipeline, the gas is discharged from an air outlet of the air exhaust pipeline, and the residual liquid enters a methanol storage tank; the first nitrogen purging process is carried out before methanol filling and after methanol filling and in the normal methanol liquid supply process;
the second nitrogen purge flow includes: introducing nitrogen from a second nitrogen purging interface to purge, sequentially opening a liquid supply main valve and a liquid return main valve, and allowing the introduced nitrogen to purge a methanol fuel supply pipeline, a fuel valve group unit, a methanol engine, a front liquid return pipeline, a methanol recovery unit and a rear liquid return pipeline after the fuel main valve, wherein gas is discharged from an exhaust port of an exhaust pipeline, and residual liquid enters a methanol storage tank; the second nitrogen purging process is carried out before normal liquid supply of methanol, during emergency shutdown or maintenance;
the third nitrogen purge flow includes: introducing nitrogen from a third nitrogen purging interface to purge, opening a liquid return main valve, purging a pipeline behind the liquid supply main valve, a methanol engine, a front liquid return pipeline, a methanol recovery unit and a rear liquid return pipeline in a fuel valve group unit, discharging gas from an exhaust port of an exhaust pipeline, and allowing residual liquid to enter a methanol storage tank; and when the methanol engine is normally stopped, performing the third nitrogen purging flow.
According to the marine methanol fuel supply method, the methanol fuel which is not used by the methanol engine is returned to the methanol storage tank through the methanol recovery unit, so that the recovery and reuse of the methanol fuel are realized, and the waste of the methanol fuel is reduced. Moreover, the marine methanol fuel supply system is simple in design and high in safety.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the description of the embodiments will be briefly introduced below, it being obvious that the drawings in the following description are only some embodiments of the present application, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a marine methanol fuel supply system provided in the present application.
Reference numerals illustrate: 1. a methanol storage tank; 2. a methanol pump; 3. a first pressure transmitter; 4. a pressure control valve; 5. a fuel main valve; 6. a double-walled outer tube; 7. a manual valve; 8. a second pressure transmitter; 9. a first filter; 10. a liquid supply main valve; 11. a third pressure transmitter; 12. a first flowmeter; 13. a pressure regulating valve; 14. a fourth pressure transmitter; 15. a liquid level switch; 16. a fuel valve block unit; 17. a methanol engine; 18. a nacelle; 19. a methanol recovery unit; 20. a liquid return main valve; 21. a second flowmeter; 22. a heat exchanger; 23. a temperature transmitter; 24. an exhaust valve; 25. a second filter; 26. a liquid phase filling valve; 27. a gas phase return valve; 28. a liquid phase filling port; 29. a gas phase return port; 30. a first nitrogen purge port; 31. a second nitrogen purge port; 32. a third nitrogen purge port; 33. a heat exchange water inlet; 34. a heat exchange water outlet; 35. an exhaust port; 36. a methanol fuel supply line; 37. a front-end liquid return pipeline; 38. a liquid return pipeline at the rear end; 39. an exhaust line; 40. a liquid phase filling line; 41. a gas phase return line; 42. and a bypass line.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all, of the embodiments of the present application. All other embodiments, based on the embodiments herein, which are within the scope of the protection of the present application, will be within the skill of the art without inventive effort. Furthermore, it should be understood that the detailed description is presented herein for purposes of illustration and explanation only and is not intended to limit the present application. In this application, unless otherwise indicated, terms of orientation such as "upper", "lower", "left" and "right" are generally used to refer to the directions of the drawings in which the device is actually used or in an operating state.
The present application provides a method for supplying methanol fuel for a ship, which will be described in detail below. It should be noted that the following description order of the embodiments is not intended to limit the preferred order of the embodiments of the present application. In the following embodiments, the descriptions of the embodiments are focused on, and for the part that is not described in detail in a certain embodiment, reference may be made to the related descriptions of other embodiments.
Referring to fig. 1, a schematic structural diagram of a methanol fuel supply system for a ship is provided. The marine methanol fuel supply system includes: a methanol storage tank 1, a methanol supply unit, a fuel valve unit 16, a methanol engine 17 and a methanol recovery unit 19 which are sequentially connected in series through a methanol fuel supply pipeline 36; and the methanol recovery unit 19 is connected back to the methanol storage tank 1, the methanol recovery unit 19 comprises a liquid return main valve 20, a second flowmeter 21, a heat exchanger 22 and a temperature transmitter 23 which are sequentially connected in series, the methanol engine 17 is connected with the liquid return main valve 20 through a front liquid return pipeline 37, and the temperature transmitter 23 is connected with the methanol storage tank 1 through a rear liquid return pipeline 38. The liquid return main valve 20 is used for realizing on-off and isolation of the methanol recovery unit 19, and is convenient to maintain. The second flowmeter 21 is used for measuring the methanol fuel return flow rate of the methanol engine 17. The heat exchanger 22 is used for cooling the returned methanol fuel and ensuring the normal temperature in the methanol storage tank 1. The temperature transmitter 23 is used for monitoring the temperature of the returned methanol fuel, and when the temperature of the returned methanol fuel is not in the set range, the temperature transmitter alarms in time.
According to the marine methanol fuel supply system, methanol fuel which is not used by the methanol engine 17 is returned to the methanol storage tank 1 through the methanol recovery unit 19, so that the recovery and reuse of the methanol fuel are realized, and the waste of the methanol fuel is reduced.
Further, the methanol recovery unit 19 further includes a heat exchange water inlet 33 and a heat exchange water outlet 34, and the heat exchange water inlet 33 and the heat exchange water outlet 34 are connected to the heat exchanger 22, so as to cooperate with the heat exchanger 22 to dissipate heat of the methanol recovery unit 19.
In addition, the methanol supply unit comprises a methanol pump 2, a first pressure transmitter 3 and a fuel main valve 5 which are sequentially connected in series; the methanol pump 2 is connected with the methanol storage tank 1, and the fuel main valve 5 is connected with the fuel valve group unit 16 through the methanol fuel supply pipeline 36; the methanol pump 2 pumps out the methanol fuel in the methanol storage tank 1 and then sends the methanol fuel to the fuel valve block unit 16 through the fuel main valve 5. In a specific embodiment, the supply pressure of the methanol supply unit is 5bar to 10bar, so that the low-pressure liquid supply of the marine methanol fuel engine is realized. And the methanol supply unit is integrated at the joint of the methanol storage tank 1, so that the structure is compact, the operation is convenient, and the safety is high. The first pressure transmitter 3 is used for monitoring the pressure behind the pump (namely, behind the methanol pump 2), indicating whether the methanol pump 2 works normally or not, and alarming in time when the pressure behind the pump is abnormal.
Further, the methanol supply unit further includes a pressure control valve 4, one end of the pressure control valve 4 is connected between the first pressure transmitter 3 and the fuel main valve 5, and the other end is connected between the methanol storage tank 1 and the methanol pump 2 through a bypass line 42, and when the pressure behind the methanol pump 2 exceeds the set value of the pressure control valve 4, the methanol fuel is automatically returned to the upstream of the methanol pump 1, so that the waste of the methanol fuel can be further reduced.
In addition, the fuel valve block unit 16 and the methanol engine 17 are arranged together in the cabin 18, so that the length of a pipeline from the outlet of the fuel valve block unit 16 to the methanol engine 17 can be shortened, the pressure loss of fuel supplied to the methanol engine 17 can be reduced, and the control accuracy can be improved. The cabin 18 is an intrinsically safe cabin, the inside is a safe area, and the outside of the fuel pipe belongs to a dangerous area, so that the methanol fuel supply pipelines between the fuel valve group unit 16 and the methanol engine 17, between the fuel valve group unit 16 and the methanol supply unit, and between the methanol engine 17 and the methanol recovery unit 19 in the cabin 18 are double-wall outer pipes 6 to isolate the dangerous area, and meanwhile, ventilation monitoring and combustible gas detection can be performed on the double-wall outer pipes 6, and when the leakage of methanol vapor is detected, an alarm is given in time.
The fuel valve group unit 16 comprises a manual valve 7, a second pressure transmitter 8, a first filter 9, a liquid supply main valve 10, a third pressure transmitter 11, a first flowmeter 12, a pressure regulating valve 13 and a fourth pressure transmitter 14 which are sequentially connected in series, wherein the manual valve 7, the second pressure transmitter 8, the first filter 9, the liquid supply main valve 10, the third pressure transmitter 11, the first flowmeter 12, the pressure regulating valve 13 and the fourth pressure transmitter 14 are integrated in a closed container, the inside is a dangerous area, and the outside is a safe area. The fuel valve block unit 16 provides the methanol engine 17 with a suitable pressure and flow of methanol fuel. The fuel consumption amount of the methanol engine 17 can be accurately calculated by the difference between the supply flow meter (i.e., the first flow meter 12) and the return flow meter (i.e., the second flow meter 21) provided before and after the methanol engine 17. The manual valve 7 is used for isolating the methanol fuel supply pipeline 36 from the fuel valve unit 16, and when the fuel valve unit 16 or the methanol engine 17 needs maintenance, the manual valve 7 is closed, so that safety is ensured. The second pressure transmitter 8 is used for monitoring the inlet pressure of the fuel valve group unit 16, the third pressure transmitter 11 is used for monitoring the pressure in the fuel valve group unit 16, the difference value of the two pressures is the pressure difference of the first filter 9, and when the difference value reaches a set value, the filter element is timely warned to be replaced. The first filter 9 is used for filtering the methanol fuel entering the fuel valve unit 16, so as to prevent impurities in the construction process of the early pipeline from entering the back end working components in the system, and protect the back end working components in the system, such as the first flowmeter 12, the pressure regulating valve 13 and the like. The liquid supply main valve 10 is used for controlling the liquid supply and stop of the methanol fuel. The first flowmeter 12 is used for monitoring the supply flow rate of the whole marine methanol fuel supply system. The pressure regulating valve 13 may regulate the outlet pressure of the pressure regulating valve 13 according to the load of the methanol engine 17. The fourth pressure transmitter 14 is used for monitoring the outlet pressure of the pressure regulating valve 13, i.e. the inlet pressure of the methanol engine 17.
Further, a liquid level switch 15 is arranged at the bottom of the container and is used for monitoring the leakage of liquid in the pipeline in the fuel valve group unit 16, and when the liquid level switch detects the leakage, the system immediately stops emergently.
In addition, the marine methanol fuel supply system further comprises a methanol filling unit, the methanol filling unit comprises a liquid phase filling pipeline 40 and a gas phase return pipeline 41, the liquid phase filling pipeline 40 and the gas phase return pipeline 41 are connected with the methanol storage tank 1, the liquid phase filling pipeline 40 comprises a liquid phase filling port 28, a liquid phase filling valve 26 and a second filter 25 which are sequentially connected in series, and the gas phase return pipeline 41 comprises a gas phase return valve 27 and a gas phase return port 29 which are sequentially connected in series. Wherein, the second filter 25 filters the methanol fuel injected through the liquid phase injection port 28, and reduces impurities of the methanol fuel in the methanol storage tank 1, thereby improving the safety of the methanol engine 17. And the methanol filling unit is also integrated at the connecting part of the methanol storage tank 1, so that the structure is compact, the operation is convenient, and the safety is high.
In addition, the methanol fuel supply system for a ship further comprises an exhaust pipeline 39, wherein the exhaust pipeline 39 comprises an exhaust valve 24 and an exhaust port 35 which are sequentially connected in series.
Finally, the marine methanol fuel supply system further comprises a first nitrogen purging interface 30, a second nitrogen purging interface 31 and a third nitrogen purging interface 32; the first nitrogen purging port 30 is disposed at the liquid-phase filling port 28 and the gas-phase gas-return port 29, and is used for inerting the liquid-phase filling pipe 40 and the gas-phase gas-return pipe 41 before and after filling, so as to ensure filling safety; the second nitrogen purging interface 31 is disposed behind the fuel main valve 5, and is used for purging the working components and pipelines behind the methanol supply unit during liquid supply, and for purging the residual methanol fuel liquid in the pipelines to flow back to the methanol storage tank 1 after the methanol engine 17 is stopped; the third nitrogen purging interface 32 is disposed behind the main liquid supply valve 10, and is used for purging nitrogen when liquid supply is normally stopped, so that safety is ensured and nitrogen consumption can be saved.
The application also provides a marine methanol fuel supply method, which adopts the marine methanol fuel supply system, and comprises the steps of: starting the methanol pump 2, opening the fuel main valve 5, enabling the methanol fuel to flow to the fuel valve group unit 16, enabling the methanol fuel liquid filtered by the first filter 9 to flow to the liquid supply main valve 10 through the manual valve 7; the main liquid supply valve 10 and the main liquid return valve 20 are opened, the methanol fuel liquid flows through the first flowmeter 12, and is supplied to the methanol engine 17 after being regulated by the pressure regulating valve 13; the methanol fuel liquid which is not used by the methanol engine 17 flows to the methanol recovery unit 19 through the front-end liquid return pipeline 37, passes through the liquid return main valve 20 and the second flowmeter 21, and finally flows to the methanol storage tank 1 through the rear-end liquid return pipeline 38 after the heat exchanger 22 takes away the excessive heat. And the waste of methanol fuel is reduced.
Further, the liquid supply flow further comprises: when the pressure of the liquid supply pipeline behind the methanol pump 2 reaches the set value of the pressure control valve 4, methanol fuel liquid flows back to the inlet pipeline of the methanol pump 2 from the bypass pipeline 42. To enhance the security of the system.
Further, the method may further comprise normally stopping the flow of the feed stream: the methanol pump 2, the fuel main valve 5 and the liquid supply main valve 10 are closed, the liquid return main valve 20 is kept open, and liquid supply is stopped.
Further, the method also includes emergency stopping the flow of the feed stream: when the methanol engine 17 is stopped due to an emergency or the system detects a fault such as methanol fuel leakage, the methanol pump 2 and the fuel main valve 5 are immediately closed, the liquid supply main valve 10 and the liquid return main valve 20 are kept open, and liquid supply is stopped.
Further, the method also comprises a methanol filling flow: the liquid phase filling valve 26 and the gas phase return valve 27 are opened, the methanol fuel liquid is filled from the liquid phase filling port 28, flows through the liquid phase filling valve 26, and the liquid phase methanol filtered by the second filter 25 enters the methanol storage tank 1, and then the gas phase methanol in the methanol storage tank 1 flows out from the gas phase return pipeline 41, through the gas phase return valve 27 and the gas phase return port 29 along with the injection of the methanol fuel liquid, so that the pressure balance in the methanol storage tank 1 in the filling process is ensured.
Finally, the method further comprises a nitrogen purging flow, wherein the nitrogen purging flow comprises a first nitrogen purging flow, a second nitrogen purging flow and a third nitrogen purging flow:
the first nitrogen purge flow includes: introducing nitrogen from a first nitrogen purging interface 30 to purge, sequentially opening a liquid phase filling valve 26, a gas phase filling valve 27 and an exhaust valve 24, purging a liquid phase filling pipeline 40 and a gas phase air return pipeline 41 by nitrogen, discharging gas from an exhaust port 35 of an exhaust pipeline 39, and allowing residual liquid (if any) to enter a methanol storage tank 1; the first nitrogen purging process is carried out before methanol filling and after methanol filling and in the normal methanol liquid supply process;
the second nitrogen purge flow includes: introducing nitrogen from a second nitrogen purging interface 31 to purge, sequentially opening a liquid supply main valve 10 and a liquid return main valve 20, and introducing the nitrogen to purge a methanol fuel supply pipeline 36, a fuel valve group unit 16, a methanol engine 17, a front liquid return pipeline 37, a methanol recovery unit 19 and a rear liquid return pipeline 38 after the fuel main valve 5, wherein gas is discharged from an exhaust port 35 of an exhaust pipeline 39, and residual liquid (if any) enters a methanol storage tank 1; the second nitrogen purging process is carried out before normal liquid supply of methanol, during emergency shutdown or maintenance;
the third nitrogen purge flow includes: introducing nitrogen from a third nitrogen purging interface 32 for purging, opening a liquid return main valve 20, purging a pipeline after the liquid supply main valve 10, a methanol engine 17, a front liquid return pipeline 37, a methanol recovery unit 19 and a rear liquid return pipeline 38 in a fuel valve group unit 16, discharging gas from an exhaust port 35 of an exhaust pipeline 39, and allowing residual liquid (if any) to enter a methanol storage tank 1; and when the methanol engine 17 is normally stopped, the third nitrogen purging process is performed.
The waste of methanol fuel is reduced to different degrees in the first nitrogen purging process, the second nitrogen purging process and the third nitrogen purging process.
According to the marine methanol fuel supply method, the methanol fuel which is not used by the methanol engine is returned to the methanol storage tank through the methanol recovery unit, so that the recovery and reuse of the methanol fuel are realized, and the waste of the methanol fuel is reduced. Moreover, the marine methanol fuel supply system is simple in design and high in safety.
The foregoing has described in detail a method for supplying methanol fuel for a ship, wherein specific examples are employed to illustrate the principles and embodiments of the present application, and the above examples are only for aiding in understanding the method and core ideas of the present application; meanwhile, as those skilled in the art will have modifications in the specific embodiments and application scope in accordance with the ideas of the present application, the present description should not be construed as limiting the present application in view of the above.
Claims (6)
1. A marine methanol fuel supply method, employing a marine methanol fuel supply system, the marine methanol fuel supply system comprising: a methanol storage tank, a methanol supply unit, a fuel valve unit, a methanol engine and a methanol recovery unit which are sequentially connected in series through a methanol fuel supply pipeline; the methanol recovery unit is connected back to the methanol storage tank, the methanol recovery unit comprises a liquid return main valve, a second flowmeter, a heat exchanger and a temperature transmitter which are sequentially connected in series, the methanol engine is connected with the liquid return main valve through a front liquid return pipeline, and the temperature transmitter is connected with the methanol storage tank through a rear liquid return pipeline;
the method includes a feed flow path: starting a methanol pump, opening a fuel main valve, enabling methanol fuel to flow to a fuel valve group unit, enabling the methanol fuel to flow through a manual valve, and enabling the methanol fuel liquid filtered by a first filter to flow to a liquid supply main valve; opening a liquid supply main valve and a liquid return main valve, and supplying the methanol fuel liquid to a methanol engine after the methanol fuel liquid flows through a first flowmeter and is regulated by a pressure regulating valve; the methanol fuel liquid which is not used by the methanol engine flows to the methanol recovery unit through the front-end liquid return pipeline, passes through the liquid return main valve and the second flowmeter, takes away excessive heat through the heat exchanger, and finally flows to the methanol storage tank through the rear-end liquid return pipeline.
2. The marine methanol fuel supply method as in claim 1 wherein the supply flow path further comprises: and when the pressure of the liquid supply pipeline behind the methanol pump reaches the set value of the pressure control valve, the methanol fuel liquid flows back to the inlet pipeline of the methanol pump from the bypass pipeline.
3. The marine methanol fuel supply method of claim 1 further comprising normally stopping the supply flow: and closing the methanol pump, the fuel main valve and the liquid supply main valve, keeping the liquid return main valve open, and stopping liquid supply.
4. A marine methanol fuel supply method as in claim 3 further comprising an emergency stop supply flow: when the methanol engine is stopped due to the emergency of the fault or the system monitors the leakage fault of the methanol fuel, the methanol pump and the main fuel valve are immediately closed, the main liquid supply valve and the main liquid return valve are kept open, and the liquid supply is stopped.
5. The marine methanol fueling method of claim 4 wherein the method further comprises a methanol fueling process: opening a liquid phase filling valve and a gas phase return valve, injecting the methanol fuel liquid from the liquid phase filling port, flowing through the liquid phase filling valve, filtering the liquid phase methanol through a second filter, entering a methanol storage tank, and flowing out the gas phase methanol in the methanol storage tank from the gas phase return pipeline through the gas phase return valve and the gas phase return port along with the injection of the methanol fuel liquid, so as to ensure the pressure balance in the methanol storage tank in the filling process.
6. The marine methanol fuel supply method of claim 5 further comprising a nitrogen purge flow including a first nitrogen purge flow, a second nitrogen purge flow, a third nitrogen purge flow:
the first nitrogen purge flow includes: introducing nitrogen from a first nitrogen purging interface to purge, sequentially opening a liquid phase filling valve, a gas phase filling valve and a gas phase air return pipeline, wherein the nitrogen purges a liquid phase filling pipeline and a gas phase air return pipeline, the gas is discharged from an air outlet of the air exhaust pipeline, and the residual liquid enters a methanol storage tank; the first nitrogen purging process is carried out before methanol filling and after methanol filling and in the normal methanol liquid supply process;
the second nitrogen purge flow includes: introducing nitrogen from a second nitrogen purging interface to purge, sequentially opening a liquid supply main valve and a liquid return main valve, and allowing the introduced nitrogen to purge a methanol fuel supply pipeline, a fuel valve group unit, a methanol engine, a front liquid return pipeline, a methanol recovery unit and a rear liquid return pipeline after the fuel main valve, wherein gas is discharged from an exhaust port of an exhaust pipeline, and residual liquid enters a methanol storage tank; the second nitrogen purging process is carried out before normal liquid supply of methanol, during emergency shutdown or maintenance;
the third nitrogen purge flow includes: introducing nitrogen from a third nitrogen purging interface to purge, opening a liquid return main valve, purging a pipeline behind the liquid supply main valve, a methanol engine, a front liquid return pipeline, a methanol recovery unit and a rear liquid return pipeline in a fuel valve group unit, discharging gas from an exhaust port of an exhaust pipeline, and allowing residual liquid to enter a methanol storage tank; and when the methanol engine is normally stopped, performing the third nitrogen purging flow.
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| CN202210013162.3A CN114320686B (en) | 2022-01-07 | 2022-01-07 | Marine methanol fuel supply method |
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| CN202210013162.3A CN114320686B (en) | 2022-01-07 | 2022-01-07 | Marine methanol fuel supply method |
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| CN114837858B (en) * | 2022-04-14 | 2023-05-02 | 中国船舶重工集团柴油机有限公司 | Marine liquid ammonia fuel storage, filling and supply system |
| CN114992014A (en) * | 2022-05-26 | 2022-09-02 | 淄柴机器有限公司 | Methanol fuel accumulator and marine engine system |
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