CN117432534A - Flushing system and method for low-flash-point fuel - Google Patents

Flushing system and method for low-flash-point fuel Download PDF

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Publication number
CN117432534A
CN117432534A CN202311258687.4A CN202311258687A CN117432534A CN 117432534 A CN117432534 A CN 117432534A CN 202311258687 A CN202311258687 A CN 202311258687A CN 117432534 A CN117432534 A CN 117432534A
Authority
CN
China
Prior art keywords
fuel
low
flushing
valve
switching valve
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202311258687.4A
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Chinese (zh)
Inventor
文李明
黑小芙
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Shipbuilding Power Engineering Institute Co Ltd
Original Assignee
China Shipbuilding Power Engineering Institute Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Shipbuilding Power Engineering Institute Co Ltd filed Critical China Shipbuilding Power Engineering Institute Co Ltd
Priority to CN202311258687.4A priority Critical patent/CN117432534A/en
Publication of CN117432534A publication Critical patent/CN117432534A/en
Pending legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0602—Control of components of the fuel supply system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B69/00—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types
    • F02B69/02—Internal-combustion engines convertible into other combustion-engine type, not provided for in F02B11/00; Internal-combustion engines of different types characterised by constructions facilitating use of same main engine-parts in different types for different fuel types, other than engines indifferent to fuel consumed, e.g. convertible from light to heavy fuel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0639—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed characterised by the type of fuels
    • F02D19/0649—Liquid fuels having different boiling temperatures, volatilities, densities, viscosities, cetane or octane numbers
    • F02D19/0652—Biofuels, e.g. plant oils
    • F02D19/0655—Biofuels, e.g. plant oils at least one fuel being an alcohol, e.g. ethanol
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0665—Tanks, e.g. multiple tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0668—Treating or cleaning means; Fuel filters
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/0663—Details on the fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
    • F02D19/0673—Valves; Pressure or flow regulators; Mixers
    • F02D19/0681—Shut-off valves; Check valves; Safety valves; Pressure relief valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D19/00—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
    • F02D19/06—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed
    • F02D19/08—Controlling engines characterised by their use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures peculiar to engines working with pluralities of fuels, e.g. alternatively with light and heavy fuel oil, other than engines indifferent to the fuel consumed simultaneously using pluralities of fuels
    • 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

Abstract

The invention discloses a flushing system and a flushing method for low-flash-point fuel. The system comprises a low-carbon fuel supply module communicated with a low-carbon fuel tank, wherein the low-carbon fuel supply module and a fuel mixing box are respectively connected with two inlet ends of a fuel inlet switching valve, an outlet end of the fuel inlet switching valve is connected with an inlet of a low-carbon fuel engine through a first fuel supply stop valve and a second fuel supply stop valve in sequence, and an outlet end of the first fuel supply stop valve is also connected with the low-carbon fuel tank through a ventilation valve; the outlet of the low-carbon fuel engine is connected with the inlet end of the fuel return switching valve, and the two outlet ends of the fuel return switching valve are respectively connected with the low-carbon fuel tank and the fuel mixing tank; the inlet of the low-carbon fuel engine is also connected with a flushing pipeline, and a flushing valve is arranged on the flushing pipeline. The invention adopts the diesel oil which is also liquid fuel to carry out the operation principle of liquid blowing, thus leading the structural arrangement of the system to be more flexible and avoiding the consumption of a large amount of compressed gas.

Description

Flushing system and method for low-flash-point fuel
Technical Field
The invention relates to a technical solution measure for safely using low-flash-point fuel, in particular to a principle and an operation method for flushing a pipeline of low-flash-point fuel, belonging to the technical field of power machinery, in particular to the application field of a novel high-power medium-low-speed dual-fuel engine for a ship.
Background
As the concern of the IMO international maritime organization for carbon emissions from ships has increased, a series of mandatory regulations have been successively put out in recent years to limit and restrict the carbon emissions from ships. Therefore, the search for low-carbon, zero-carbon alternative to traditional fossil fuels is a very critical and effective approach to solving the carbon emissions of ships. At present, various novel fuels such as methanol, ethanol, LPG, LNG, ammonia, hydrogen, DME and the like are technically proven to be used for combustion of a reciprocating internal combustion engine, namely, the novel fuel can replace traditional diesel fuel, is used for the engine, and can reduce carbon emission of ships to different degrees according to fuel types. However, unlike conventional diesel fuels, the novel fuels have common low viscosity, low flash point, low heating value characteristics, strong corrosion, strong toxicity and other individual characteristics. Particularly the low flash point characteristics, make safe use of fuels a great challenge. According to the requirements of the existing international relevant laws and regulations, when a ship uses low-flash-point fuel, under the working condition that the ship is stopped or other engines do not use the low-flash-point fuel, the low-flash-point fuel related pipelines are required to be purged and cleaned, and finally, the low-flash-point fuel is not remained in the engine related pipelines, so that the inflammable and explosive problems of the low-flash-point fuel are eliminated, and the engines using the low-flash-point fuel have extremely high safety.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: a system and method for purging and cleaning low flash point fuel related piping is provided.
In order to solve the above problems, the present invention provides a flushing system for low flash point fuel, which includes a low carbon fuel supply module communicating with a low carbon fuel tank, wherein the low carbon fuel supply module and a fuel mixing tank are respectively connected with two inlet ends of a fuel inlet switching valve, an outlet end of the fuel inlet switching valve is sequentially connected with an inlet of a low carbon fuel engine through a first fuel supply stop valve and a second fuel supply stop valve, and an outlet end of the first fuel supply stop valve is also connected with the low carbon fuel tank through a ventilation valve; the outlet of the low-carbon fuel engine is connected with the inlet end of the fuel return switching valve, and the two outlet ends of the fuel return switching valve are respectively connected with the low-carbon fuel tank and the fuel mixing tank; the inlet of the low-carbon fuel engine is also connected with a flushing pipeline, and a flushing valve is arranged on the flushing pipeline.
Preferably, the fuel mixing tank is connected to the fuel inlet switching valve by a mixed fuel supply pump.
Preferably, a flowmeter is arranged on a pipeline between the fuel mixing box and the fuel inlet switching valve.
Preferably, the flushing medium in the flushing line is a first fuel oil, i.e. diesel. The low carbon fuel in the invention is the second fuel of the engine, and the first fuel is the traditional diesel fuel.
The invention also provides a flushing method of the low-flash-point fuel, which adopts the flushing system of the low-flash-point fuel, when the low-carbon fuel is switched to diesel fuel, residual low-flash-point fuel in a low-carbon fuel pipeline is required to be flushed completely, so that at the moment of switching instructions, the diesel fuel injection system can immediately start to work (the first fuel injection system and the second fuel injection system are independent systems), then the fuel inlet switching valve, the fuel supply stop valve I and the fuel supply stop valve II are closed, the ventilation valve is opened, simultaneously, the fuel return switching valve is switched to be communicated with a low-carbon fuel tank, the low-carbon fuel in the low-carbon fuel engine is discharged back to the low-carbon fuel tank through the fuel return switching valve, when the low-carbon fuel pipeline of the low-carbon fuel engine detects that the pressure of the low-carbon fuel engine is reduced to a set value, the fuel return switching valve is switched to be communicated with the fuel mixing tank, and simultaneously, diesel fuel enters the low-carbon fuel engine through the flushing valve, the low-carbon fuel pipeline of the low-carbon fuel engine is flushed, and returns to the fuel mixing tank through the switching valve.
Preferably, the set point is 1bar.
Preferably, the working state of each valve on the fuel-available pipeline in the fuel mixing box enters the low-carbon fuel engine to participate in combustion.
Compared with the prior art, the invention has the beneficial effects that:
1) Compared with the gas-liquid blowing method which adopts inert gases such as nitrogen to purge pipelines at present, the operation principle of liquid blowing is carried out by adopting diesel oil which is also liquid fuel, so that the structural arrangement of the system is more flexible, and a large amount of compressed gas is not consumed;
2) The conventional diesel fuel existing on the engine is used as a medium for purging liquid fuels such as methanol, DME and the like, so that the system has very simple structure and low cost;
3) The diesel methanol mixed solution formed after diesel flushing can be recycled as fuel, so that the method has extremely high economical efficiency.
Drawings
FIG. 1 is a schematic illustration of a flushing system for low flash point fuel provided by the present invention;
FIG. 2 is a schematic diagram of a state of a low carbon fuel mode of operation;
FIG. 3 is a schematic state diagram of a mixed fuel operating mode;
FIG. 4 is a schematic illustration of a first stage-bleed condition in a flush mode;
FIG. 5 is a schematic diagram showing a second stage of flushing in a flushing mode;
in the figure, the broken line is a mixed fuel, and the solid line is diesel or low carbon fuel.
Detailed Description
In order to make the invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Examples
As shown in fig. 1, the flushing system for low flash point fuel provided by the invention comprises a low carbon fuel supply module 2 communicated with a low carbon fuel tank 1, wherein the low carbon fuel supply module 2 and a fuel mixing tank 3 are respectively connected with two inlet ends of a fuel inlet switching valve 5 (the fuel mixing tank 3 is sequentially communicated with a mixed fuel supply pump 13, a flowmeter 11 and the fuel inlet switching valve 5), an outlet end of the fuel inlet switching valve 5 is sequentially connected with an inlet of a low carbon fuel engine 4 through a first fuel supply stop valve 8 and a second fuel supply stop valve 6, and an outlet end of the first fuel supply stop valve 8 is also connected with the low carbon fuel tank 1 through a ventilation valve 7; the outlet of the low-carbon fuel engine 4 is connected with the inlet end of the fuel return switching valve 9, and the two outlet ends of the fuel return switching valve 9 are respectively connected with the low-carbon fuel tank 1 and the fuel mixing tank 3; the inlet of the low-carbon fuel engine 4 is also connected with a flushing pipeline, a flushing valve 10 is arranged on the flushing pipeline, and a flushing medium in the flushing pipeline is diesel oil.
The working principle of the flushing system is as follows:
low carbon fuel mode of operation (as shown in fig. 2): the inlet end of the fuel inlet switching valve 5 is switched to be communicated with the fuel supply module 1, the first fuel supply stop valve 8 and the second fuel supply stop valve 6 are opened, and the ventilation valve 7, the fuel return switching valve 9 and the flushing valve 10 are closed;
mixed fuel mode of operation (as shown in fig. 3): the inlet end of the fuel inlet switching valve 5 is switched to be communicated with the fuel mixing box 3, the first fuel supply stop valve 8 and the second fuel supply stop valve 6 are opened, and the ventilation valve 7, the fuel return switching valve 9 and the flushing valve 10 are closed;
first stage of flush mode-bleed (as shown in fig. 4): when the low-carbon fuel is switched to the diesel fuel, the residual low-flash-point fuel in the low-carbon fuel pipeline is required to be washed clean, so that the diesel fuel injection system immediately starts to work at the moment of a switching command, then the fuel inlet switching valve 5, the fuel supply stop valve I8 and the fuel supply stop valve II 6 are closed, the ventilation valve 7 is opened, and simultaneously the fuel return switching valve 9 is switched to be communicated with the low-carbon fuel tank 1, and the low-carbon fuel in the low-carbon fuel engine 4 is discharged back to the low-carbon fuel tank 1 through the fuel return switching valve 9; the flush valve 10 is always in the closed state;
second stage of flush mode-flush (as shown in fig. 5): when the low carbon fuel pipeline of the low carbon fuel engine 4 detects that the pressure is reduced by 1bar, the switching valve 9 is switched to be communicated with the fuel mixing tank 3, the flushing valve 10 is opened, diesel enters the low carbon fuel engine 4 through the flushing valve 10, the low carbon fuel pipeline of the low carbon fuel engine 4 is flushed, and the diesel flows back to the fuel mixing tank 3 through the switching valve 9; at this time, the fuel inlet switching valve 5, the first fuel supply shutoff valve 8, and the second fuel supply shutoff valve 6 are kept closed, and the breather valve 7 is kept open.
The working state of each valve on the fuel supply pipeline in the fuel mixing box 3 enters the low-carbon fuel engine 4 to participate in combustion. The fuel inlet switching valve 5 and the fuel return switching valve 9 are two key three-way valves in the system, the fuel inlet switching valve 5 is used for switching the source of fuel supply, the fuel return switching valve 9 is used for controlling the return trend of fuel on a machine, and the fuel return switching valve not only bears the direct return of clean low-carbon fuel to a fuel tank, but also plays a circulating role when diesel oil enters a pipeline to flush the low-carbon fuel, and returns mixed fuel to the mixed fuel tank 3. The mixed fuel supply pump 13 circulates and supplies the fuel in the mixed fuel tank 3, and the fuel enters the main engine of the low-carbon fuel engine 4 through the fuel inlet switching valve 5 for circulation.

Claims (7)

1. The flushing system of the low flash point fuel is characterized by comprising a low carbon fuel supply module (2) communicated with a low carbon fuel tank (1), wherein the low carbon fuel supply module (2) and a fuel mixing tank (3) are respectively connected with two inlet ends of a fuel inlet switching valve (5), an outlet end of the fuel inlet switching valve (5) is sequentially connected with an inlet of a low carbon fuel engine (4) through a first fuel supply stop valve (8) and a second fuel supply stop valve (6), and an outlet end of the first fuel supply stop valve (8) is also connected with the low carbon fuel tank (1) through a ventilation valve (7); the outlet of the low-carbon fuel engine (4) is connected with the inlet end of the fuel return switching valve (9), and the two outlet ends of the fuel return switching valve (9) are respectively connected with the low-carbon fuel tank (1) and the fuel mixing tank (3); the inlet of the low-carbon fuel engine (4) is also connected with a flushing pipeline, and a flushing valve (10) is arranged on the flushing pipeline.
2. Flushing system of low flash point fuel according to claim 1, characterized in that the fuel mixing tank (3) is connected to the fuel inlet switching valve (5) by means of a mixed fuel feed pump (13).
3. Flushing system for low flash point fuel according to claim 1, characterized in that a flow meter (11) is arranged in the line between the fuel mixing tank (3) and the fuel inlet switching valve (5).
4. The low flash point fuel flushing system of claim 1, wherein the flushing medium in the flushing line is diesel.
5. A flushing method of low flash point fuel, characterized in that a flushing system of low flash point fuel according to any one of claims 1-4 is used, when the low carbon fuel is switched to diesel fuel, the residual low flash point fuel in the low carbon fuel line must be flushed clean, so that at the moment of the switching command, the diesel fuel injection system will start to operate immediately, after which the fuel feed switching valve (5), the fuel feed shutoff valve one (8), the fuel feed shutoff valve two (6) are closed, the venting valve (7) is opened, at the same time the fuel return switching valve (9) is switched to communicate with the low carbon fuel tank (1), the low carbon fuel in the low carbon fuel engine (4) is discharged back to the low carbon fuel tank (1) through the fuel return switching valve (9), when the low carbon fuel line of the low carbon fuel engine (4) detects a pressure drop to a set value, the fuel return switching valve (9) is communicated with the fuel mixing tank (3), the flushing valve (10) is opened, diesel fuel enters the low carbon fuel engine (4) through the flushing valve (10), the low carbon fuel line of the low carbon fuel engine (4) is flushed through the flushing valve (9), and the low carbon fuel line of the low carbon fuel engine (3) is returned to the mixing tank (3).
6. The method for flushing a low flash point fuel of claim 5, wherein the set point is 1bar.
7. A method of flushing low flash point fuel according to claim 5, characterized in that the operating state of the valves in the fuel-feedable line in the fuel-mixing tank (3) is entered into the low-carbon fuel engine (4) and takes part in the combustion.
CN202311258687.4A 2023-09-26 2023-09-26 Flushing system and method for low-flash-point fuel Pending CN117432534A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202311258687.4A CN117432534A (en) 2023-09-26 2023-09-26 Flushing system and method for low-flash-point fuel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202311258687.4A CN117432534A (en) 2023-09-26 2023-09-26 Flushing system and method for low-flash-point fuel

Publications (1)

Publication Number Publication Date
CN117432534A true CN117432534A (en) 2024-01-23

Family

ID=89545299

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202311258687.4A Pending CN117432534A (en) 2023-09-26 2023-09-26 Flushing system and method for low-flash-point fuel

Country Status (1)

Country Link
CN (1) CN117432534A (en)

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