CN113090417B - LPG gas-liquid separation jar and fuel control system - Google Patents
LPG gas-liquid separation jar and fuel control system Download PDFInfo
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- CN113090417B CN113090417B CN202110332122.0A CN202110332122A CN113090417B CN 113090417 B CN113090417 B CN 113090417B CN 202110332122 A CN202110332122 A CN 202110332122A CN 113090417 B CN113090417 B CN 113090417B
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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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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0027—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures the fuel being gaseous
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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
- F02M21/0227—Means to treat or clean gaseous fuels or fuel systems, e.g. removal of tar, cracking, reforming or enriching
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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
- F02M21/023—Valves; Pressure or flow regulators in the fuel supply or return system
- F02M21/0242—Shut-off valves; Check valves; Safety valves; Pressure relief 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
- F02M21/0218—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
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0293—Safety devices; Fail-safe measures
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Ocean & Marine Engineering (AREA)
- Filling Or Discharging Of Gas Storage Vessels (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
The invention discloses an LPG (liquefied petroleum gas) gas-liquid separation tank and a fuel control system, which belong to the technical field of LPG (liquefied petroleum gas) power systems of ships and are divided into a gas-liquid separation tank part and a fuel supply part, wherein the gas-liquid separation tank part comprises a gas-liquid separation buffer tank, a second nitrogen supply pipe, a group of control signal wires and a fuel supply control unit; the fuel supply part comprises an LPG power ship main engine, an LPG storage tank, a first nitrogen supply pipe, another set of control signal wires and another fuel supply control unit. The LPG gas-liquid separation tank and the fuel control system collect a gas-liquid mixture obtained by mutual replacement of nitrogen and LPG in a pipeline, maintain the operation of the whole fuel supply system at stable pressure and flow rate by arranging a fuel supply control unit and automatically adjusting the opening of a fuel supply pump and a remote control proportional valve through a VFD frequency converter, and realize gas-liquid separation under the specified pressure and temperature in the buffer tank and emergency release under overpressure by using the automatic control of the remote control proportional valve.
Description
Technical Field
The invention belongs to the technical field of ship LPG power systems, and particularly relates to an LPG gas-liquid separation tank and a fuel control system.
Background
On an LNG (liquefied natural gas) power ship, natural gas vaporized by a vaporizer is generally supplied to a main engine of the ship, the gas directly enters a main engine cylinder, a loop is generally not needed due to compressibility of the gas, on the existing LPG (liquefied petroleum gas) ship, as LPG is directly sprayed into the main engine cylinder to combust and work, a liquid return pipe and an overpressure overflow pipe are required to be arranged due to the fact that liquid is incompressible and easy to overpressure, in addition, the LPG power main engine needs to replace nitrogen in a pipeline by the LPG before starting, the LPG in the pipeline needs to be replaced by the nitrogen after stopping, a replaced gas-liquid mixture needs to be collected and processed, and the existing fuel pipeline system design mode of the general LNG cannot meet the use requirement of LPG fuel.
Therefore, the stable use of LPG as marine fuel and the collection and separation of nitrogen and LPG in pipelines are realized by designing an LPG gas-liquid separation tank and a fuel control system.
Disclosure of Invention
In view of the disadvantages of the prior art, the present invention provides an LPG gas-liquid separation tank and a fuel control system to solve the problems of the prior art.
In order to achieve the purpose, the invention provides the following technical scheme: an LPG (liquefied petroleum gas) gas-liquid separation tank and a fuel control system are divided into a gas-liquid separation tank part and a fuel supply part, wherein the gas-liquid separation tank part comprises a gas-liquid separation buffer tank, a second nitrogen supply pipe, a group of control signal lines and a fuel supply control unit, a first remote control proportional valve is arranged on a pipeline between the gas-liquid separation buffer tank and the second nitrogen supply pipe, a first liquid level alarm switch and a second liquid level alarm switch are fixedly arranged inside a tank body of the gas-liquid separation buffer tank, a second pressure sensor and a temperature sensor are also arranged inside the tank body of the gas-liquid separation buffer tank, a second remote control proportional valve, a third remote control proportional valve and a fourth remote control proportional valve are arranged on an external pipeline branch of the gas-liquid separation buffer tank, and the second remote control proportional valve and the fourth remote control proportional valve are controlled by the fuel supply control unit, the fuel supply part is used for controlling the opening and closing of a pipeline of the fuel supply part;
the fuel supply part comprises an LPG power ship host, an LPG storage tank, a first nitrogen supply pipe, another group of control signal lines and another fuel supply control unit, a conveying pipeline and an oil return pipeline are arranged between the LPG power ship host and the LPG storage tank, the first nitrogen supply pipe is arranged on an external pipeline branch of the conveying pipeline, the fuel supply control unit is arranged on the external pipeline of the conveying pipeline, a first pressure sensor and a sixth remote control proportional valve are further arranged on the external pipeline of the conveying pipeline, a fifth remote control proportional valve and a cooler are arranged on the external pipeline of the oil return pipeline, and the oil return pipeline is communicated with a gas-liquid separation buffer tank in the gas-liquid separation tank part through a second remote control proportional valve and a fourth remote control proportional valve.
According to the technical scheme, the first liquid level alarm switch and the second liquid level alarm switch are respectively arranged on the upper side and the lower side of the inner part of the gas-liquid separation buffer tank body; the first liquid level alarm switch gives an alarm for a high liquid level, and the second liquid level alarm switch gives an alarm for a low liquid level.
In order to further optimize the technical scheme, a fuel pump is arranged in a fuel supply control unit in the fuel supply part, and a VFD frequency converter used for adjusting the flow rate and the pressure of the fuel pump is connected with an external signal of the fuel supply control unit.
Further optimizing the technical scheme, before the main engine of the LPG power ship is started for the first time, natural air, moisture and other impurities in the pipeline need to be removed by nitrogen purging, and the interior of the pipeline is inerted to prevent LPG from directly entering the pipeline to form an explosive mixture with the natural air.
Further optimizing the technical scheme, after the inerting treatment is carried out in the pipeline in the first step, the nitrogen in the pipeline needs to be replaced by LPG in the second step, the main engine of the LPG power ship can be started in the third step, and the LPG in the pipeline needs to be replaced by the nitrogen after the engine is stopped.
Further optimize this technical scheme, fuel control system divides into two kinds of operating modes in the fuel supply part, and operating mode one promptly: when the main engine of the LPG power ship normally operates, the fifth remote control proportional valve is opened, the fourth remote control proportional valve is closed, the fuel supply control unit obtains LPG from an LPG storage tank and supplies the LPG to the main engine of the LPG power ship through the conveying pipeline, and redundant LPG fuel reaches the inlet of a fuel pump of the fuel supply control unit after being cooled by the oil return pipeline, the fifth remote control proportional valve and the cooler, reenters the pump and circularly enters the supply pipeline again; working conditions are as follows: when the host of the LPG power ship is shut down, the fifth remote control proportional valve is closed, the fourth remote control proportional valve is opened, the first nitrogen supply pipe is opened to purge the pipeline, LPG in the pipeline is replaced, and a mixture of nitrogen and LPG in the pipeline enters the gas-liquid separation buffer tank.
The technical scheme is further optimized, when the fuel control system in the fuel supply part is in a working condition, the pressure on the conveying pipeline is monitored through the first pressure sensor, when the pressure is deviated from the rated pressure, the fuel supply control unit automatically adjusts the flow and the pressure of the fuel pump through the VFD frequency converter and can simultaneously adjust the opening of the sixth remote control proportional valve, when the pressure is high, the opening of the sixth remote control proportional valve is increased, when the pressure is low, the opening of the sixth remote control proportional valve is reduced, and the whole fuel supply system is maintained to operate at the specified pressure and the specified flow through the adjustment of the pump and the valve.
Further optimizes the technical proposal, and the gas-liquid separation buffer tank is used for gas-liquid separation of LPG under the appointed pressure and temperature and automatic control of the liquid level in the tank of LPG under the condition of triggering an alarm signal.
Compared with the prior art, the invention provides an LPG gas-liquid separation tank and a fuel control system, which have the following beneficial effects:
1. this LPG gas-liquid separation jar and fuel control system through being provided with the gas-liquid separation buffer tank, when the host computer start and shut down, collects the gas-liquid mixture after nitrogen gas and the mutual replacement of LPG in the pipeline.
2. The LPG gas-liquid separation tank and the fuel control system are provided with a fuel supply control unit, and the opening degree of a fuel supply pump and a remote control proportional valve is automatically adjusted through a VFD frequency converter, so that the whole fuel supply system is maintained to operate at stable pressure and flow.
3. According to the LPG gas-liquid separation tank and the fuel control system, gas-liquid separation in the buffer tank at specified pressure and temperature is realized by automatically controlling the gas inlet of the nitrogen gas supply pipe and the gas outlet of the gas-liquid separation buffer tank through the remote control proportional valve, and emergency release is realized when overpressure occurs, so that the safety is improved.
4. The LPG-gas separation tank and the fuel control system have high and low liquid level alarm, the high level automatically discharges LPG back to the storage tank, and the low level stops, so that the automatic control of the liquid level is realized.
Drawings
Fig. 1 is a schematic structural diagram of an LPG gas-liquid separation tank and a fuel control system according to the present invention.
In the figure: 1. a gas-liquid separation buffer tank; 2. a first remote control proportional valve; 3. a second remote-controlled proportional valve; 4. a third remote control proportional valve; 5. a fourth remote control proportional valve; 6. a fifth remote control proportional valve; 7. a sixth remote control proportional valve; 8. a fuel supply control unit; 9. an LPG storage tank; 10. a first pressure sensor; 11. a second pressure sensor; 12. a first liquid level alarm switch; 13. a cooler; 14. a first nitrogen gas supply pipe; 15. a second nitrogen gas supply pipe; 16. an LPG powered marine main engine; 17. a second liquid level alarm switch; 18. a VFD frequency converter; 19. a delivery line; 20. a control signal line; 21. a temperature sensor; 22. an oil return line.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to 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 derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, an LPG separating tank and a fuel control system are divided into a gas-liquid separating tank portion and a fuel supply portion, the gas-liquid separating tank portion includes a gas-liquid separating buffer tank 1, a second nitrogen supply pipe 15, a set of control signal lines 20 and a fuel supply control unit 8, a first remote control proportional valve 2 is disposed on a pipeline between the gas-liquid separating buffer tank 1 and the second nitrogen supply pipe 15, a first liquid level alarm switch 12 and a second liquid level alarm switch 17 are fixedly mounted inside a tank body of the gas-liquid separating buffer tank 1, a second pressure sensor 11 and a temperature sensor 21 are further disposed inside the tank body of the gas-liquid separating buffer tank 1, a second remote control proportional valve 3, a third remote control proportional valve 4 and a fourth remote control proportional valve 5 are disposed on an external pipeline branch of the gas-liquid separating buffer tank 1, the second remote control proportional valve 3 and the fourth remote control proportional valve 5 are controlled by the fuel supply control unit 8, the pipeline is used for controlling the opening and closing of the pipeline of the fuel supply part;
the fuel supply section comprises an LPG powered marine vessel main engine 16, an LPG storage tank 9, a first nitrogen supply line 14, a further set of control signal lines 20 and a further fuel supply control unit 8, a delivery line 19 and an oil return line 22 are arranged between the LPG power vessel main engine 16 and the LPG storage tank 9, the first nitrogen gas supply pipe 14 is provided on an external pipe branch of the delivery pipe 19, the fuel supply control unit 8 is provided on an external pipe of the delivery pipe 19, a first pressure sensor 10 and a sixth remote control proportional valve 7 are also arranged on the external pipeline of the conveying pipeline 19, the external pipeline of the oil return pipeline 22 is provided with a fifth remote control proportional valve 6 and a cooler 13, the oil return pipeline 22 is communicated with the gas-liquid separation buffer tank 1 in the gas-liquid separation tank part through a second remote control proportional valve 3 and a fourth remote control proportional valve 5.
Specifically, the first liquid level alarm switch 12 and the second liquid level alarm switch 17 are respectively arranged on the upper side and the lower side of the interior of the gas-liquid separation buffer tank 1; the first liquid level alarm switch 12 alarms for a high liquid level, and the second liquid level alarm switch 17 alarms for a low liquid level.
The second embodiment:
by adopting the LPG gas-liquid separation tank and the fuel control system described in the first embodiment, the control system is specifically operated, and before the LPG power ship main engine 16 is started for the first time, the natural air, moisture and other impurities in the pipeline need to be removed by nitrogen purging in the first step, and the interior of the pipeline is inerted, so that the LPG is prevented from directly entering the pipeline and forming an explosive mixture with the natural air. The second step requires replacement of nitrogen in the pipeline with LPG and the third step is to start the LPG powered vessel main unit 16. After shutdown, the LPG in the line needs to be replaced with nitrogen. The displaced gas-liquid mixture needs to be collected in the gas-liquid separation buffer tank 1 and treated no matter whether the gas-liquid separation buffer tank is started or stopped, and the nitrogen and the LPG in the collecting pipeline are displaced with each other to form the mixture, and due to the diversity of LPG components, partial LPG vaporized matter is not excluded from the mixture.
The fuel control system in the fuel supply part is divided into two working conditions, namely a working condition I: when the LPG power ship main engine 16 normally operates, the fifth remote control proportional valve 6 is opened, the fourth remote control proportional valve 5 is closed, the fuel supply control unit 8 obtains LPG from the LPG storage tank 9 and supplies the LPG power ship main engine 16 through the conveying pipeline 19, and redundant LPG fuel reaches the fuel pump inlet of the fuel supply control unit 8 after being cooled through the oil return pipeline 22, the fifth remote control proportional valve 6 and the cooler 13, enters the pump again and circulates into the supply pipeline again; and a second working condition: when the host 16 of the LPG power ship is shut down, the fifth remote control proportional valve 6 is closed, the fourth remote control proportional valve 5 is opened, the first nitrogen supply pipe 14 is opened to purge the pipeline, LPG in the pipeline is replaced, and a mixture of nitrogen and LPG in the pipeline enters the gas-liquid separation buffer tank 1.
The pressure-stabilizing automatic overflow loop composed of the first pressure sensor 10, the VFD frequency converter 18, the sixth remote control proportional valve 7, the control signal line 20 and the like is connected to the fuel supply control unit 8 in the fuel supply part for signal collection and control. The method is characterized in that the pressure on a conveying pipeline 19 is monitored through a first pressure sensor 10, when the pressure deviates from the rated pressure, a fuel supply control unit 8 automatically adjusts the flow and the pressure of a fuel pump through a VFD frequency converter 18 and can simultaneously adjust the opening degree of a sixth remote control proportional valve 7, when the pressure is high, the opening degree of the sixth remote control proportional valve 7 is increased, when the pressure is low, the opening degree of the sixth remote control proportional valve 7 is reduced, and the whole fuel supply system is maintained to operate at the specified pressure and the specified flow through the adjustment of the pump and the valve.
When the gas-liquid separation buffer tank 1 is in gas-liquid separation and is stopped, the fourth remote control proportional valve 5 is opened, a mixture of nitrogen and LPG which are mutually replaced enters the gas-liquid separation buffer tank 1, the second nitrogen supply pipe 15 is always opened and is at a specified pressure, under the pressure, the LPG entering the gas-liquid separation buffer tank 1 is collected at the bottom of the tank because the specific gravity of the liquid is greater than that of the gas, and a little vaporized LPG entering the gas-liquid separation buffer tank 1 is collected at the bottom of the gas-liquid separation buffer tank 1 according to the saturated vapor pressure characteristic of the LPG under the pressure and the corresponding temperature of the second nitrogen supply pipe 15. When the mixture entering the gas-liquid separation buffer tank 1 is small or the flow rate is small, the second pressure sensor 11 will indicate that the pressure is low and transmit an alarm signal to the fuel supply control unit 8 in the gas-liquid separation buffer tank section, and the fuel supply control unit 8 will control the opening of the first remote-controlled proportional valve 2 to increase and gradually decrease the opening of the third remote-controlled proportional valve 4 to a closed state, thereby increasing the tank internal pressure to maintain the tank internal pressure at a set value, and the pressure sensor alarm is released. If more mixture or larger flow velocity enters the gas-liquid separation buffer tank 1, the vaporized LPG is not in time to be liquefied, and the pressure is increased due to the increase of the vaporized matter, the second pressure sensor 11 will display high pressure and transmit an alarm signal to the fuel supply control unit 8, the fuel supply control unit 8 will control the opening of the second remote control proportional valve 2 to be reduced, and gradually increase the opening of the third remote control proportional valve 4 to a fully opened state, so that the vaporized LPG which is not in time to be liquefied is safely discharged through the third remote control proportional valve 4, the pressure in the tank is reduced to maintain the pressure in a normal state, and meanwhile, the high pressure alarm is released.
For example, when the gas-liquid separation buffer tank 1 is in gas-liquid separation, the high-pressure alarm cannot be relieved when the third remote control proportional valve 4 is opened to a fully opened state, and the pressure in the tank is further increased to trigger the safety release opening and release the safety release opening to a safety area for discharging.
When the gas-liquid separation buffer tank 1 automatically discharges liquid, a first liquid level alarm switch 12, a second liquid level alarm switch 17 and a second remote control proportional valve 3 are connected into a fuel supply control unit 8 together for signal feedback and automatic control. When the liquid collected in the gas-liquid separation buffer tank 1 reaches a high level, the second remote control proportional valve 3 is opened, the liquid in the tank discharges LPG and returns to the storage tank, when the liquid is discharged to a low level, the alarm signal is triggered, the second remote control proportional valve 3 is closed, and the discharge is stopped, so that the automatic control of the liquid level in the tank is realized.
The invention has the beneficial effects that:
1. this LPG gas-liquid separation jar and fuel control system through being provided with the gas-liquid separation buffer tank, when the host computer start-up and shut down, collects the gas-liquid mixture after nitrogen gas and the mutual replacement of LPG in the pipeline.
2. The LPG gas-liquid separation tank and the fuel control system are provided with a fuel supply control unit, and the opening degree of a fuel supply pump and the opening degree of a remote control proportional valve are automatically adjusted through a VFD frequency converter, so that the whole fuel supply system is maintained to operate at stable pressure and flow.
3. According to the LPG gas-liquid separation tank and the fuel control system, gas-liquid separation in the buffer tank at specified pressure and temperature is realized by automatically controlling the gas inlet of the nitrogen gas supply pipe and the gas outlet of the gas-liquid separation buffer tank through the remote control proportional valve, and emergency release is realized when overpressure occurs, so that the safety is improved.
4. The LPG gas-liquid separation tank and the fuel control system have the advantages that high-low liquid level alarming is realized, LPG is automatically discharged from the high position and returns to the storage tank, and the low position stops, so that the automatic control of the liquid level is realized.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
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. The LPG gas-liquid separation tank and the fuel control system are divided into a gas-liquid separation tank part and a fuel supply part, and are characterized in that the gas-liquid separation tank part comprises a gas-liquid separation buffer tank (1), a second nitrogen supply pipe (15), a group of control signal lines (20) and a fuel supply control unit (8), a first remote control proportional valve (2) is arranged on a pipeline between the gas-liquid separation buffer tank (1) and the second nitrogen supply pipe (15), a first liquid level alarm switch (12) and a second liquid level alarm switch (17) are fixedly arranged inside a tank body of the gas-liquid separation buffer tank (1), a second pressure sensor (11) and a temperature sensor (21) are further arranged inside the tank body of the gas-liquid separation buffer tank (1), and a second remote control proportional valve (3) is arranged on an external pipeline branch of the gas-liquid separation buffer tank (1), The second remote control proportional valve (3) and the fourth remote control proportional valve (5) are controlled by a fuel supply control unit (8) and are used for opening and closing with a pipeline of a fuel supply part;
the fuel supply part comprises an LPG power ship host (16), an LPG storage tank (9), a first nitrogen supply pipe (14), another set of control signal line (20) and another fuel supply control unit (8), a conveying pipeline (19) and an oil return pipeline (22) are arranged between the LPG power ship host (16) and the LPG storage tank (9), the first nitrogen supply pipe (14) is arranged on an external pipeline branch of the conveying pipeline (19), the fuel supply control unit (8) is arranged on an external pipeline of the conveying pipeline (19), a first pressure sensor (10) and a sixth remote control proportional valve (7) are further arranged on the external pipeline of the conveying pipeline (19), a fifth remote control proportional valve (6) and a cooler (13) are arranged on the external pipeline of the oil return pipeline (22), and the oil return pipeline (22) and a gas-liquid separation tank part are connected through the second remote control proportional valve (3) and the fourth remote control proportional valve (5) The separation buffer tank (1) is communicated;
the first liquid level alarm switch (12) and the second liquid level alarm switch (17) are respectively arranged on the upper side and the lower side of the interior of the gas-liquid separation buffer tank (1); the first liquid level alarm switch (12) gives an alarm for a high liquid level, and the second liquid level alarm switch (17) gives an alarm for a low liquid level;
the fuel control system in the fuel supply part is divided into two working conditions, namely a working condition I: when the LPG power ship main engine (16) normally runs, the fifth remote control proportional valve (6) is opened, the fourth remote control proportional valve (5) is closed, the fuel supply control unit (8) acquires LPG from the LPG storage tank (9) and supplies the LPG power ship main engine (16) through the conveying pipeline (19), and redundant LPG fuel reaches the inlet of a fuel pump of the fuel supply control unit (8) after being cooled by the oil return pipeline (22), the fifth remote control proportional valve (6) and the cooler (13), reenters the pump and circulates into the supply pipeline again; working conditions are as follows: when the main engine (16) of the LPG power ship stops, the fifth remote control proportional valve (6) is closed, the fourth remote control proportional valve (5) is opened, the first nitrogen supply pipe (14) opens a purging pipeline to replace LPG in the pipeline, and a mixture of nitrogen and LPG in the pipeline enters the gas-liquid separation buffer tank (1).
2. The LPG gas-liquid separation tank and fuel control system according to claim 1, characterized in that a fuel pump is built in the fuel supply control unit (8) of the fuel supply part, and a VFD inverter (18) for adjusting the flow rate and pressure of the fuel pump is connected to an external signal of the fuel supply control unit (8).
3. LPG gas-liquid separation tank and fuel control system according to claim 1, characterized in that the main engine (16) of the LPG powered vessel, before the first start-up, in the first step requires nitrogen purge to remove natural air, moisture and other impurities in the pipeline, inerting the inside of the pipeline, in order to avoid LPG coming directly into the pipeline to form explosive mixture with natural air.
4. An LPG gas-liquid separation tank and fuel control system as claimed in claim 3, wherein after the pipeline internal inerting treatment of the first step, the nitrogen in the pipeline is replaced by LPG in the second step, and the LPG power vessel main engine (16) is started in the third step, and the LPG in the pipeline is replaced by nitrogen after the shutdown.
5. The LPG gas-liquid separation tank and the fuel control system as claimed in claim 1, wherein the fuel control system in the fuel supply part monitors the pressure on the delivery pipeline (19) through the first pressure sensor (10) in a working condition, when the pressure deviates from the rated pressure, the fuel supply control unit (8) automatically adjusts the flow rate and the pressure of the fuel pump through the VFD frequency converter (18) and can simultaneously adjust the opening degree of the sixth remote control proportional valve (7), when the pressure is high, the opening degree of the sixth remote control proportional valve (7) is increased, and when the pressure is low, the opening degree of the sixth remote control proportional valve (7) is decreased, and the whole fuel supply system is maintained to be operated at the designated pressure and the designated flow rate through the adjustment of the pump and the valves.
6. LPG gas-liquid separation tank and fuel control system according to claim 1, characterized in that the gas-liquid separation buffer tank (1) is used for the automatic control of the gas-liquid separation of LPG at a given pressure and temperature and the tank level of LPG at the triggering of an alarm signal.
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| 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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