CN114109659B - LPG fuel pipeline control method - Google Patents
LPG fuel pipeline control method Download PDFInfo
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- CN114109659B CN114109659B CN202111422349.0A CN202111422349A CN114109659B CN 114109659 B CN114109659 B CN 114109659B CN 202111422349 A CN202111422349 A CN 202111422349A CN 114109659 B CN114109659 B CN 114109659B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0203—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels characterised by the type of gaseous fuel
- F02M21/0215—Mixtures of gaseous fuels; Natural gas; Biogas; Mine gas; Landfill gas
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0245—High pressure fuel supply systems; Rails; Pumps; Arrangement of valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/06—Apparatus for de-liquefying, e.g. by heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses a LPG fuel pipeline control method, and relates to the technical field of LNG power ship pipeline control. The method comprises the steps of starting a water glycol system and circulating to a stable state, starting a low-pressure pump and a high-pressure pump, enabling a fuel supply system to reach a preparation state, supplying fuel to a main engine to reach specified working pressure and temperature, loading the main engine to a small load for operation, loading the main engine to a normal operation load, and stopping the main engine. The engine in the ship host machine can use LPG as fuel, reduces cost, can automatically heat, pressurize, cool, decompress, inertize and separate gas from liquid, can utilize surplus overpressure fuel in a backflow way, can heat and cool LPG fuel through a water-glycol system, can adjust the temperature of the engine by other heat sources and cold sources, runs through automatic control equipment of a fuel supply system, is matched with the host machine control system in a start-stop way, is automatically operated, accords with economic benefits, and has wide application prospect.
Description
Technical Field
The invention relates to the technical field of pipeline control of LNG powered ships, in particular to a LPG fuel pipeline control method.
Background
On an LNG power ship, natural gas vaporized by a vaporizer is generally supplied to a main engine of the ship for combustion, the gas directly enters a main engine cylinder, a loop is generally not needed due to compressibility of the gas, on the existing LPG main engine ship, as LPG (liquid petroleum gas) is directly sprayed into the main engine cylinder for combustion to do work, a liquid return pipe is required to be arranged due to the fact that liquid is incompressible and easy to cause overpressure, and excess fuel with overpressure is returned and collected.
The LPG needs 50bar plus or minus 2 high pressure and 35 plus or minus 8 temperature when entering the host, the LPG is stored in the fuel tank at low temperature of-45 ℃, the storage pressure is lower than 5bar, so the LPG needs to enter the host after pressurization and heating treatment, and the surplus LPG needs to be cooled and decompressed before flowing back to the fuel tank, but the current fuel pipeline control method of the LNG can not meet the use of LPG fuel.
Disclosure of Invention
The invention provides a method for controlling an LPG fuel pipeline, which aims to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: an LPG fuel line control method comprising the steps of:
s1, starting a water glycol system and circulating to a stable state;
s2, starting a low-pressure pump;
s3, starting the high-pressure pump, and enabling the fuel supply system to reach a preparation state;
s4, supplying fuel to the main engine to reach the specified working pressure and temperature;
s5, loading the host to a low load for operation;
s6, loading the host to a normal operation load;
s7, stopping the host;
s8, the fuel supply system enters standby;
s9, stopping the low-pressure pump and the high-pressure pump, and inerting a fuel pipeline of the main engine;
and S10, stopping circulation of the water glycol system.
Further, the water glycol system in the S1 is composed of a water glycol pipe, a water glycol pump, a heating exchanger, a cooling exchanger, a cold-heat exchanger, a proportional valve eight, a heat source pipe, a proportional valve nine, a cold source pipe and an outlet pipe, when the water glycol system is in operation, the water glycol pipe is filled with water glycol liquid, the water glycol pump allows the liquid to perform closed circulation in the water glycol pipe, the liquid is heated by the heating exchanger, and the high-temperature liquid flowing back is cooled by the cooling exchanger.
Further, in S1, when the water glycol system is started and circulated to a stable state, the water glycol pipe is filled with water glycol liquid, the water glycol pump is started to allow the liquid to perform closed circulation in the water glycol pipe, the first low-pressure pump outlet proportional valve is opened, the third high-pressure pump outlet proportional valve is opened, the ethylene glycol system is set to operate for a period of time through the fuel supply system, and parameters of the water glycol pump are fed back to the fuel supply system to determine that the water glycol system is circulated to the stable state.
Further, the fuel supply system in S3 controls the low-pressure pump, the high-pressure pump, the water glycol pump, the first remote-transmission pressure gauge, the second remote-transmission pressure gauge, the third remote-transmission pressure gauge, the first remote-transmission temperature gauge, the second remote-transmission temperature gauge, the third remote-transmission temperature gauge, the fourth remote-transmission temperature gauge, the fifth remote-transmission temperature gauge, the gas-liquid buffer tank, the first proportional valve, the second proportional valve, the third proportional valve, the fourth proportional valve, the fifth proportional valve, the sixth proportional valve, the seventh proportional valve, the eighth proportional valve, the ninth proportional valve, the tenth proportional valve and the timer through a lead, so that the operations of conveying, heating, pressurizing, cooling, depressurizing, inerting and gas-liquid separating of the fuel are realized.
Further, in S2, before the low-pressure pump is started, the water glycol system needs to be continuously operated until the second remote-transmission temperature gauge shows 28-35 degrees, before the high-pressure pump is started in S3, the low-pressure pump needs to be continuously operated for a period of time, after the first remote-transmission pressure gauge reaches 19bar, the high-pressure pump is started to wait for 5-10 seconds, the fuel supply system is set to enable the second remote-transmission pressure gauge to reach 42bar and the first remote-transmission temperature gauge to reach 38 degrees and stably maintain the first remote-transmission pressure gauge, a signal is transmitted to the host control system, the host control system is connected with the ship host through a lead, and the host control system is used for controlling the proportional valve ten to control the inert gas source
Further, in S4, the setting is changed through the fuel supply system, the operation is performed until the pressure of the remote pressure gauge two reaches the specified value 50bar, the temperature of the remote pressure gauge one is in the specified temperature range of 36-43 degrees, the pressure of the remote pressure gauge two is also adjusted by being associated with the proportional valve three, the proportional valve four and the high-pressure pump, and the temperature of the remote pressure gauge one is adjusted by being associated with the proportional valve eight and the proportional valve nine.
Further, in the step S5, the load of the ship main engine is adjusted to be within a range of 5% -10% of the rated power by the main engine control system, the timer is started, the waiting time is 60-80 seconds, the proportional valve six is kept opened, and the proportional valve five and the proportional valve seven are kept closed, in the step S6, the load of the ship main engine is adjusted to be in a normal working state by the main engine control system, and at the moment, the fuel supply system automatically adjusts and controls the opening and closing states of the fuel pipe one, the fuel pipe two and the fuel pipe three.
Further, in S7, the host control system controls the ship host to stop, then the fuel supply system controls the proportional valve six to close, the proportional valve five and the proportional valve seven to open, the fuel returns to circulate through the buffer tank, the liquid fuel returns to the fuel tank through the fuel pipe seven, in S8, the pressure of the remote transmission pressure gauge two is set to be controlled at 42bar through the fuel supply system, the pressure of the remote transmission pressure gauge two is related to the proportional valve three, the proportional valve four and the high-pressure pump, the opening degrees of the proportional valve three and the proportional valve four are adjusted, the fuel partially flows back through the fuel pipe four, the pressure of the remote transmission pressure gauge two is adjusted to be 42bar at a specified value, then the timer is started, and the waiting time is 800-1000 seconds.
Further, in S9, after the timer waiting time is finished, the fuel supply system stops the low-pressure pump and the high-pressure pump, then sets the timer, waits for 15 to 20 seconds, then closes the first proportional valve, the second proportional valve, the third proportional valve, and the fourth proportional valve, then the host control system controls the control valve to open, the inert gas blows off the remaining fuel through the inert gas pipe, the mixture of the fuel and the inert gas is blown off from the fifth fuel pipe to the gas-liquid buffer tank, the fuel and the inert gas are separated in the gas-liquid buffer tank, the liquid is collected at the bottom of the tank, the remaining gas is separately discharged, the timer is started, after the blowing off is continued for 60 to 100 seconds, the fifth proportional valve, the seventh proportional valve, and the tenth proportional valve are closed, and the host fuel pipe inerting is finished.
Further, in S10, after the inerting of the main fuel line is completed, a timer is started, and the timer waits for 250 to 350 seconds, and then the fuel supply system controls the water glycol pump to stop.
Compared with the prior art, the invention provides an LPG fuel pipeline control method, which has the following beneficial effects:
according to the LPG fuel pipeline control method, an engine in a ship host machine can use LPG as fuel, the cost is reduced, meanwhile, the automatic heating, pressurizing, cooling, pressure reducing, inerting and gas-liquid separating operation of the fuel can be realized, the surplus overpressure fuel can be recycled, the heating and cooling of the LPG fuel can be realized through a water-glycol system, the temperature of the LPG fuel can be adjusted by other heat sources and cold sources, the LPG fuel pipeline control method runs through the automatic control equipment of the fuel supply system and is matched with the host machine control system in starting and stopping, the LPG fuel pipeline control method is operated automatically, the economic benefit is met, and the application prospect is wide.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the piping of the present invention.
In the figure: 1. a water glycol pump; 2. a low pressure pump; 3. a high pressure pump; 4. a fuel tank; 5. a first fuel pipe; 6. a second fuel pipe; 7. a third fuel pipe; 8. a fuel pipe IV; 9. a fifth fuel pipe; 10. a sixth fuel pipe; 11. a fuel pipe seven; 12. a fuel pipe eight; 13. a heat source tube; 14. a cold source tube; 15. an outlet pipe; 16. a gas-liquid buffer tank; 17. a first proportional valve; 18. a second proportional valve; 19. a third proportional valve; 20. a fourth proportional valve; 21. a fifth proportional valve; 22. a proportional valve six; 23. a proportional valve seven; 24. a proportional valve eighth; 25. a proportional valve nine; 26. ten proportional valves; 27. a heat exchanger; 28. a cooling exchanger; 29. a cold-heat exchanger; 30. a first pressure gauge is remotely transmitted; 31. a second pressure gauge is remotely transmitted; 32. a third remote transmission pressure gauge; 33. a marine main engine; 34. a frequency converter; 35. a timer; 36. a pressure reducing valve; 37. a remote transmission thermometer I; 38. a second remote thermometer; 39. a third remote temperature meter; 40. a remote thermometer IV; 41. a fifth remote thermometer; 42. a water glycol pipe; 43. an inert gas pipe; 44. and a sixth remote thermometer.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
Referring to fig. 1-2, the present invention discloses a method for controlling an LPG fuel line, comprising the steps of:
s1, starting a water glycol system and circulating the water glycol system to a stable state, starting the water glycol system and circulating the water glycol system to the stable state, filling water glycol liquid in a water glycol pipe 42, starting a water glycol pump 1 to enable the liquid to be in closed circulation in the water glycol pipe 42, opening a first outlet proportional valve 17 of a low-pressure pump 2, opening a third outlet proportional valve 19 of a high-pressure pump 3, setting the operation of the glycol system for a period of time through a fuel supply system, and feeding parameters of the water glycol pump 1 back to the fuel supply system to determine that the water glycol system is circulated to the stable state;
s2, starting the low-pressure pump 2, before starting the low-pressure pump 2, continuously operating the water glycol system until a remote transmission temperature meter II 38 shows 28-35 ℃, opening and associating a proportional valve eight 24 and a proportional valve nine 25, performing heat exchange with water glycol in a cold heat exchanger 29 through an input heat exchange medium of a heat source pipe 13 or a cold source pipe 14 to adjust the remote transmission temperature meter display of 25 to 28-35 ℃, then starting the B1 low-pressure pump 2, and waiting for a period of time (5-10 seconds);
s3, starting the high-pressure pump 3, enabling the fuel supply system to reach a ready state, referring to a figure 2, wherein FSS is the fuel supply system, before the high-pressure pump 3 is started, the low-pressure pump 2 needs to continuously run for a period of time, after a value of a remote pressure gauge first 30 reaches p3 to 19bar, the high-pressure pump 3 is started, waiting for 5-10 seconds, and when a value of a remote pressure gauge second 31 reaches p2 to 42bar and a value of a remote temperature gauge first 37 reaches 38 ℃ through the setting of the fuel supply system, transmitting a signal to a host control system, referring to the figure 2, wherein ECS is the host control system, the host control system is connected with a ship host 33 through a lead, the host control system is used for controlling a proportional valve tenth 26 to realize the control of an inert gas source, the remote pressure gauge second 31 is associated with the proportional valve third 19, the proportional valve fourth 20 and the high-pressure pump 3, the opening degrees of the high-pressure pump 3, the proportional valve three 19 and the proportional valve four 20 are adjusted through the frequency converter 34, the pressure of the remote transmission pressure gauge two 31 is adjusted to be 42bar through the backflow of the fuel pipe four 8, the remote transmission temperature gauge one 37 is associated with the proportional valve eight 24 and the proportional valve nine 25, the input of a cold source and a heat source adjusts the temperature of water glycol liquid in the cold heat exchanger 29, then the liquid heats the fuel in the fuel pipe one 5 through the water glycol pipe 42 in the heating exchanger 27, after the heat exchange with the fuel through the heating exchanger 27, the water glycol liquid is cooled, the fuel in the fuel pipe one 5 can continue to be cooled through the cooling exchanger 28 to the fuel in the fuel pipe five 9, and after the fuel in the fuel pipe one 5 is heated through the heating exchanger 27, the remote transmission temperature gauge one 37 can display that the specified value reaches 38 degrees;
s4, the fuel supply of the main engine reaches the specified working pressure and temperature, the setting is changed through the fuel supply system, the operation is carried out until the pressure of a remote transmission pressure gauge II 31 reaches the specified value P1=50bar, the pressure of the remote transmission pressure gauge I37 is in the specified temperature range of 36-43 degrees, the pressure of the remote transmission pressure gauge II 31 is also realized through the regulation related to a proportional valve III 19, a proportional valve IV 20 and the high-pressure pump 3, and the pressure of the remote transmission pressure gauge I37 is realized through the regulation related to a proportional valve eight 24 and a proportional valve nine 25;
s5, the main engine is loaded to a low load for running, the load of the ship main engine 33 is adjusted to be within a 5% -10% rated power range through the main engine control system, the timer 35 is started, the waiting time is 60-80 seconds, the proportional valve six 22 is kept opened, and the proportional valve five 21 and the proportional valve seven 23 are closed;
s6, the main engine is loaded to a normal operation load, the load of the ship main engine 33 is adjusted to a normal working state, namely 100% rated power, at the moment, the fuel supply system automatically adjusts and controls the opening and closing states of the first fuel pipe 5, the second fuel pipe 6 and the third fuel pipe 7, namely the opening degrees of all valves on the first fuel pipe 5, the second fuel pipe 6 and the third fuel pipe 7 are automatically controlled and adjusted to achieve the following stable state, a pressure gauge 30 at the outlet of the low-pressure pump 2 is a pressure P3 (19 bar +/-1), a pressure gauge 31 at the outlet of the high-pressure pump 3 is a pressure P2 (50 bar +/-2), and a temperature gauge 37 at the outlet of the high-pressure pump is in a specified temperature range (36-43 degrees), wherein the change of the fuel temperature influenced by the external environment in pipeline transmission is considered, so that the temperature of the fuel is 35 degrees +/-8 when the fuel enters a cylinder of the main engine;
s7, stopping the main engine, controlling the ship main engine 33 to stop by the main engine control system, then controlling the proportional valve six 22 to close by the fuel supply system, opening the proportional valve five 21 and the proportional valve seven 23, circulating the fuel through the buffer tank after returning the fuel, and returning the liquid fuel to the fuel tank 4 through the fuel pipe seven 11;
s8, the fuel supply system enters standby, the pressure of a second remote transmission pressure gauge 31 is set to be controlled at 42bar through the fuel supply system, the pressure of the second remote transmission pressure gauge 31 is related to a third proportional valve 19, a fourth proportional valve 20 and the high-pressure pump 3, the opening degrees of the third proportional valve 19 and the fourth proportional valve 20 are adjusted, the fuel partially flows back through a fourth fuel pipe 8, the pressure of the second remote transmission pressure gauge 31 is adjusted to be 42bar, then a timer 35 is started, and the waiting time is set to be 800-1000 seconds;
s9, stopping the low-pressure pump 2 and the high-pressure pump 3, inerting a main engine fuel pipeline, controlling the low-pressure pump 2 and the high-pressure pump 3 to stop by the fuel supply system after the waiting time of the timer 35 is finished, setting the timer 35 for waiting 15-20 seconds, then closing the first proportional valve 17, the second proportional valve 18, the third proportional valve 19 and the fourth proportional valve 20, then controlling the control valve to open by the main engine control system, blowing off residual fuel by the inert gas through the inert gas pipe 43, blowing off a fuel and inert gas mixture from the fifth fuel pipe 9 to the gas-liquid buffer tank 16, separating in the gas-liquid buffer tank 16, collecting liquid at the bottom of the tank, discharging the rest gas additionally, starting the timer 35, continuously blowing off for 60-100 seconds, closing the fifth proportional valve 21, the seventh proportional valve 23 and the tenth proportional valve 26, and inerting the main engine fuel pipeline is finished;
and S10, stopping circulation of the water glycol system, starting a timer 35 after the inerting of the main engine fuel pipeline is finished, waiting for 250-350 seconds, controlling the water glycol pump 1 to stop by the fuel supply system, and stopping the operation of the ship main engine 33, the water glycol system, the fuel supply system, each pipeline and each valve.
Specifically, the water glycol system in S1 is composed of a water glycol pipe 42, a water glycol pump 1, a heating exchanger 27, a cooling exchanger 28, a cold-heat exchanger 29, a proportional valve eight 24, a heat source pipe 13, a proportional valve nine 25, a cold source pipe 14 and an outlet pipe 15, when the water glycol system is in operation, the water glycol pipe 42 is filled with a water glycol liquid, the water glycol pump 1 allows the liquid to circulate in the water glycol pipe 42 in a closed manner, heats the liquid through the heating exchanger 27, cools the high-temperature liquid flowing back through the cooling exchanger 28, heats or cools the liquid through the cold-heat exchanger 29, the proportional valve eight 24 is opened, a heat source enters the cold-heat exchanger 29 through the heat source pipe 13 to heat the liquid and flows out of the outlet pipe 15, the proportional valve nine 25 is opened, and a cold source enters the cold-heat exchanger 29 through the cold source pipe 14 to cool the liquid and flows out of the outlet pipe 15.
Specifically, the fuel supply system in S3 controls the low-pressure pump 2, the high-pressure pump 3, the water glycol pump 1, the first remote pressure gauge 30, the second remote pressure gauge 31, the third remote pressure gauge 32, the first remote temperature gauge 37, the second remote temperature gauge 38, the third remote temperature gauge 39, the fourth remote temperature gauge 40, the fifth remote temperature gauge 41, the gas-liquid buffer tank 16, the first proportional valve 17, the second proportional valve 18, the third proportional valve 19, the fourth proportional valve 20, the fifth proportional valve 21, the sixth proportional valve 22, the seventh proportional valve 23, the eighth proportional valve 24, the ninth proportional valve 25, the tenth proportional valve 26, and the timer 35 through wires, so that operations of delivering, heating, pressurizing, cooling, depressurizing, inerting, and gas-liquid separating of the fuel are realized, the host control system can communicate with the fuel supply system and control the inerting pipe 43 and the tenth proportional valve 26, and can adjust the opening degree of the tenth proportional valve 26 from 0% to 100%, so as to realize the inerting of the host 33 and the pipes, and is configured on the second remote temperature gauge 6 for detecting the fuel pipe.
Specifically, the outlet of the low-pressure pump 2 is provided with a first fuel pipe 5, an eighth fuel pipe 12, a first proportional valve 17, a second proportional valve 18 and a first remote pressure gauge 30, the pressure at the outlet of the low-pressure pump 2 is adjusted by adjusting the opening degree of the first proportional valve 17 during normal operation, but when the first remote pressure gauge 30 displays too high pressure, the opening degree of the second proportional valve 18 can be adjusted from 0% to 100%, part of the fuel flows back through the eighth fuel pipe 12 to reduce the pressure at the first remote pressure gauge 30, and the first remote pressure gauge 30, the first proportional valve 17, the second proportional valve 18, the frequency converter 34 and the low-pressure pump 2 can be controlled in a correlated manner to adjust the pressure and the flow at the outlet of the low-pressure pump 2.
Specifically, a third fuel pipe 7, a fourth fuel pipe 8, a third proportional valve 19, a fourth proportional valve 20 and a second remote pressure gauge 31 are arranged at the outlet of the high-pressure pump 3, the pressure at the outlet of the high-pressure pump 3 is adjusted by adjusting the opening degree of the third proportional valve 19 during normal operation, but when the second remote pressure gauge 31 indicates that the pressure is too high, the opening degree of the fourth proportional valve 20 can be adjusted from 0% to 100%, part of the fuel is allowed to flow back through the fourth fuel pipe 8, so that the pressure at the second remote pressure gauge 31 is reduced, and the second remote pressure gauge 31, the third proportional valve 19, the fourth proportional valve 20, the frequency converter 34 and the high-pressure pump 3 can be controlled in a correlated manner, so that the pressure and the flow at the outlet of the high-pressure pump 3 are adjusted.
Specifically, the low-pressure pump 2, the fuel tank 4, the first fuel pipe 5, the heating exchanger 27, the second fuel pipe 6, the high-pressure pump 3, the third fuel pipe 7, the marine main engine 33, the fifth fuel pipe 9, the pressure reducing valve 36, the cooling exchanger 28, the sixth fuel pipe 10 and the gas-liquid buffer tank 16 form a fuel circulation system, when the fuel circulation system operates, the low-pressure pump 2 sucks LPG liquid fuel from the fuel tank 4, conveys the LPG liquid fuel to the first fuel pipe 5, heats the LPG liquid fuel by the heating exchanger 27, enters the second fuel pipe 6, reaches the inlet of the high-pressure pump 3, further pressurizes the LPG liquid fuel by the high-pressure pump 3, conveys the LPG liquid fuel to the cylinder of the marine main engine 33 through the third fuel pipe 7 to perform combustion work, the surplus fuel returns back through the fifth fuel pipe 9, reduces the pressure by the pressure reducing valve 36, cools the LPG liquid fuel by the cooling exchanger 28, finally returns to the inlet of the high-pressure pump 3 through the sixth fuel pipe 10 to be recycled to the marine main engine 33, the surplus fuel returns to the fifth fuel pipe 9 to perform gas-liquid separation, and the gas-liquid separation, and liquid are returned to the fuel tank 4 through the seven fuel pipe 11.
Specifically, the first proportional valve 17, the second proportional valve 18, the third proportional valve 19, the fourth proportional valve 20, the fifth proportional valve 21, the sixth proportional valve 22, the seventh proportional valve 23, the eighth proportional valve 24, the ninth proportional valve 25 and the tenth proportional valve 26 are all electrically controlled valves.
In summary, according to the LPG fuel pipeline control method, the engine in the ship main engine 33 can use LPG as fuel, so that the cost is reduced, meanwhile, the operations of heating, pressurizing, cooling, depressurizing, inerting and gas-liquid separation of the fuel can be automatically realized, the surplus overpressure fuel can be recycled, the LPG fuel can be heated and cooled through the water-glycol system, the temperature of the LPG fuel can be adjusted by another heat source and a cold source, the running of the fuel supply system automatic control equipment can be matched with the start-stop of the main engine control system, the automatic operation is realized, the economic benefit is met, and the application prospect is wide.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. An LPG fuel line control method, comprising the steps of:
s1, starting a water glycol system and circulating the water glycol system to a stable state;
s2, starting the low-pressure pump (2);
s3, starting the high-pressure pump (3), and enabling the fuel supply system to reach a preparation state;
s4, supplying fuel to the main engine to reach the specified working pressure and temperature;
s5, loading the host to a low load for operation;
s6, loading the host to a normal operation load;
s7, stopping the host;
s8, the fuel supply system enters standby;
s9, stopping the low-pressure pump (2) and the high-pressure pump (3), and inerting a fuel pipeline of the main engine;
s10, stopping circulation of a water glycol system;
the water-glycol system in the S1 is composed of a water-glycol pipe (42), a water-glycol pump (1), a heating exchanger (27), a cooling exchanger (28), a cold heat exchanger (29), a proportional valve eight (24), a heat source pipe (13), a proportional valve nine (25), a cold source pipe (14) and an outlet pipe (15), when the water-glycol system operates, the water-glycol pipe (42) is filled with water-glycol liquid, the water-glycol pump (1) enables the liquid to perform closed circulation in the water-glycol pipe (42), heats the liquid through the heating exchanger (27), and cools the refluxed high-temperature liquid through the cooling exchanger (28);
in the S1, when a water glycol system is started and circulated to a stable state, a water glycol pipe (42) is filled with water glycol liquid, a water glycol pump (1) is started, the liquid is circulated in the water glycol pipe (42) in a closed mode, a first outlet proportional valve (17) of a low-pressure pump (2) is opened, a third outlet proportional valve (19) of a high-pressure pump (3) is opened, the operation of the water glycol system is set for a period of time through a fuel supply system, and parameters of the water glycol pump (1) are fed back to the fuel supply system to determine that the water glycol system is circulated to the stable state;
the fuel supply system in the S3 controls the low-pressure pump (2), the high-pressure pump (3), the water glycol pump (1), the remote transmission pressure gauge I (30), the remote transmission pressure gauge II (31), the remote transmission pressure gauge III (32), the remote transmission temperature gauge I (37), the remote transmission temperature gauge II (38), the remote transmission temperature gauge III (39), the remote transmission temperature gauge IV (40), the remote transmission temperature gauge V (41), the gas-liquid buffer tank (16), the proportional valve I (17), the proportional valve II (18), the proportional valve III (19), the proportional valve IV (20), the proportional valve V (21), the proportional valve VI (22), the proportional valve VII (23), the proportional valve VIII (24), the proportional valve VII (25), the proportional valve VI (26) and the timer (35) through conducting wires, so that the operations of conveying, heating, pressurizing, cooling, pressure reducing, inerting and gas-liquid separation of fuel are realized;
in the S2, before the low-pressure pump (2) is started, the water glycol system needs to be continuously operated until a second remote transmission temperature gauge (38) displays 28-35 ℃, before the high-pressure pump (3) in the S3 is started, the low-pressure pump (2) needs to be continuously operated for a period of time, after a first remote transmission pressure gauge (30) reaches 19bar, the high-pressure pump (3) is started, 5-10 seconds are waited, the fuel supply system is set to transmit a signal to the host control system when the second remote transmission pressure gauge (31) reaches 42bar and the first remote transmission temperature gauge (37) reaches 38 ℃, and the signal is stably maintained, the host control system is connected with a ship host (33) through a lead, and the host control system is used for controlling a ten proportional valve (26) to realize the control of the inert gas source.
2. The LPG fuel line control method of claim 1, wherein: in the step S4, the setting is changed by the fuel supply system, the operation is performed until the pressure of the remote pressure gauge two (31) reaches the specified value 50bar, the remote temperature gauge one (37) is at the specified temperature range of 36 to 43 degrees, the pressure of the remote pressure gauge two (31) is also adjusted by being associated with the proportional valve three (19), the proportional valve four (20) and the high-pressure pump (3), and the remote temperature gauge one (37) is adjusted by being associated with the proportional valve eight (24) and the proportional valve nine (25).
3. The LPG fuel line control method of claim 1, wherein: in the step S5, the load of the ship main engine (33) is adjusted to be within a 5% -10% rated power range through the main engine control system, the timer (35) is started, the waiting time is 60-80 seconds, the proportional valve six (22) is kept to be opened, the proportional valve five (21) and the proportional valve seven (23) are kept to be closed, in the step S6, the load of the ship main engine (33) is adjusted to be in a normal working state through the main engine control system, and at the moment, the fuel supply system controls the opening and closing states of the fuel pipe I (5), the fuel pipe II (6) and the fuel pipe III (7) through automatic adjustment.
4. The LPG fuel line control method of claim 1, wherein: in S7, the host control system controls the ship host (33) to stop, then the fuel supply system controls the proportional valve six (22) to close, the proportional valve five (21) and the proportional valve seven (23) to open, the fuel returns to circulate through the buffer tank, the liquid fuel returns to the fuel tank (4) through the fuel pipe seven (11), in S8, the pressure of the remote pressure gauge two (31) is set to be 42bar through the fuel supply system, the pressure of the remote pressure gauge two (31) is related to the proportional valve three (19), the proportional valve four (20) and the high-pressure pump (3), the opening degrees of the proportional valve three (19) and the proportional valve four (20) are adjusted, the fuel is partially returned through the fuel pipe four (8), the pressure of the remote pressure gauge two (31) is adjusted to be 42bar at a specified value, then the timer (35) is started, and the waiting time is 800-1000 seconds.
5. The LPG fuel line control method of claim 1, wherein: in the S9, after the waiting time of the timer (35) is finished, the fuel supply system controls to stop the low-pressure pump (2) and the high-pressure pump (3), then the timer (35) is set, the waiting time is 15-20 seconds, then the first proportional valve (17), the second proportional valve (18), the third proportional valve (19) and the fourth proportional valve (20) are closed, next, the host control system controls to open the control valve, the inert gas blows off the residual fuel through the inert gas pipe (43), the fuel and inert gas mixture is blown off from the fifth fuel pipe (9) to the gas-liquid buffer tank (16) and is separated in the gas-liquid buffer tank (16), the liquid is collected at the bottom of the tank, the rest gas is discharged separately, the timer (35) is opened, after the blowing off is continuously carried out for 60-100 seconds, the fifth proportional valve (21), the seventh proportional valve (23) and the tenth proportional valve (26) are closed, and the inerting of the host fuel pipeline is finished.
6. The LPG fuel line control method of claim 1, wherein: in the step S10, after the inerting of the main engine fuel pipeline is finished, a timer (35) is started, 250-350 seconds are waited for, and then the fuel supply system controls the water glycol pump (1) to stop.
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| CN114320688B (en) * | 2022-03-09 | 2022-06-03 | 中国船舶重工集团柴油机有限公司 | Marine methanol fuel supply system |
| CN114635815B (en) * | 2022-04-01 | 2023-04-28 | 招商局重工(深圳)有限公司 | Methanol fuel supply system and control method thereof |
| CN115370508B (en) * | 2022-07-14 | 2024-02-20 | 友联船厂（蛇口）有限公司 | Inerting LPG host and pipeline method thereof |
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