CN114017209A - Method for purging gas in gas pipeline of marine dual-fuel main engine - Google Patents
Method for purging gas in gas pipeline of marine dual-fuel main engine Download PDFInfo
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- CN114017209A CN114017209A CN202111286240.9A CN202111286240A CN114017209A CN 114017209 A CN114017209 A CN 114017209A CN 202111286240 A CN202111286240 A CN 202111286240A CN 114017209 A CN114017209 A CN 114017209A
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- valve
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- ventilation
- purging
- pipeline
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- 238000010926 purge Methods 0.000 title claims abstract description 41
- 239000000446 fuel Substances 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 19
- 239000007789 gas Substances 0.000 claims abstract description 117
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 79
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 40
- 238000009423 ventilation Methods 0.000 claims abstract description 40
- 238000002485 combustion reaction Methods 0.000 claims abstract description 12
- 238000006243 chemical reaction Methods 0.000 claims abstract description 10
- 238000007599 discharging Methods 0.000 claims abstract description 4
- 239000002737 fuel gas Substances 0.000 claims description 9
- 239000000295 fuel oil Substances 0.000 description 2
- 239000011261 inert gas Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000010687 lubricating oil Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
Images
Classifications
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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
-
- 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
- F02D19/0613—Switch-over from one fuel to another
-
- 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
- F02D19/0642—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 at least one fuel being gaseous, the other fuels being gaseous or liquid at standard conditions
-
- 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
- F02M21/0236—Multi-way valves; Multiple valves forming a multi-way valve system
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Output Control And Ontrol Of Special Type Engine (AREA)
Abstract
A method for purging gas in a gas pipeline of a marine dual-fuel main engine is disclosed, wherein the gas pipeline is connected with a ventilation and gas purging system, and the purging method comprises the following steps: the method comprises the following steps of discharging gas in a gas pipeline in a ventilation mode under the normal conversion or normal emergency stop state of a combustion mode, and discharging the gas in the gas pipeline in a high-pressure nitrogen purging mode under the artificial emergency stop state; the ventilation and gas purging system comprises a first valve, a nitrogen inlet valve, a ventilation valve, a flowmeter, a fifth valve, a sixth valve, a three-way valve, an eighth valve and a ninth valve. The invention realizes that the gas in the gas pipeline is removed in time under three working states of normal conversion of the combustion mode, artificial emergency stop and normal emergency stop of the main engine gas system, thereby ensuring the safe operation of the dual-fuel main engine gas system.
Description
Technical Field
The invention relates to a marine dual-fuel main engine, in particular to a method for purging fuel gas in a fuel gas pipeline of a marine dual-fuel main engine, and belongs to the technical field of marine diesel engines.
Background
In the pipeline of the double-fuel main engine for the high-power ship, the double-wall pipe is used for conveying fuel gas for the main engine. In the operation process of the main engine, when the combustion mode of the main engine is changed from a gas mode to a fuel mode, gas in the gas pipeline is discharged out of the pipeline in time so as to avoid potential safety hazards of combustible gas in the pipeline under certain conditions. And when the combustion mode of the main engine is switched from the fuel oil mode to the gas mode again, the double-wall pipe is filled with combustible gas again. In order to ensure that a gas system of the dual-fuel host can operate safely, the problem of timely removing residual gas in a gas pipeline must be solved.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a method for purging gas in a gas pipeline of a marine dual-fuel main engine, so that the conversion of a normal operation combustion mode of the main engine, free ventilation during normal parking and gas purging during an emergency parking state are realized, and the safe operation of a gas system of the dual-fuel main engine is ensured.
The technical scheme of the invention is as follows:
a method for purging gas in a gas pipeline of a marine dual-fuel main engine is characterized in that the gas pipeline is composed of double-wall pipes and is connected with a ventilation and gas purging system, and the method comprises the following steps: the purging method comprises the following steps: and under the condition of normal conversion of the combustion mode or normal emergency stop, the gas in the gas pipeline is discharged in a ventilation mode, and under the condition of artificial emergency stop, the gas in the gas pipeline is discharged in a high-pressure nitrogen purging mode.
Further, the ventilation and gas purging system comprises a first valve, a nitrogen inlet valve, a ventilation valve, a flowmeter, a fifth valve, a sixth valve, a three-way valve, an eighth valve and a ninth valve; the first valve, the flowmeter, the fifth valve, the eighth valve and the host are sequentially connected, the nitrogen inlet valve and the vent valve are connected to the joint of the first valve and the flowmeter, the three-way valve is connected to the joint of the fifth valve and the eighth valve through the sixth valve, and the ninth valve is connected to the joint of the eighth valve and the host.
Further, the ventilation mode comprises the following steps: closing the first valve piece and the nitrogen inlet valve, opening the vent valve for ventilation, closing the fifth valve piece and the sixth valve piece when the flowmeter is in a normally open state, and discharging the gas in the ventilation and gas purging system pipeline through the vent valve; the three-way valve closes the nitrogen inlet and opens the other two ports to ensure that the fuel gas in the three-way valve is in a ventilation state; opening the eighth valve and the ninth valve to enable the ventilation and gas purging system pipeline in front of the main machine to be in a ventilation state; the air inlet of the gas pipeline inside the main machine is closed, the ventilation opening is opened, and gas in the gas pipeline of the main machine is discharged.
Further, the high-pressure nitrogen purging mode comprises the following steps: closing the first valve piece, opening the nitrogen inlet valve, closing the vent valve, keeping the flow meter unblocked, opening the fifth valve piece and the eighth valve piece, closing the sixth valve piece and the ninth valve piece, closing a nitrogen inlet of the three-way valve, inputting high-pressure nitrogen into a pipeline of the ventilation and gas purging system through the nitrogen inlet valve, filling the high-pressure nitrogen into a gas pipeline of the main machine at a certain pressure, and purging gas in the gas pipeline.
Further, the pressure of the high-pressure nitrogen is 6-10 bar.
Compared with the prior art, the invention achieves the following beneficial effects:
the invention realizes that the gas in the gas pipeline is removed in time under three working states of normal conversion of the combustion mode, artificial emergency stop and normal emergency stop of the main engine gas system, thereby ensuring the safe operation of the dual-fuel main engine gas system.
Drawings
Fig. 1 is a schematic view of the ventilation mode of the present invention.
FIG. 2 is a schematic diagram of the high pressure nitrogen purge mode of the present invention.
In the figure, the position of the upper end of the main shaft,
1-first valve, 2-nitrogen inlet valve, 3-vent valve, 4-flowmeter, 5-fifth valve, 6-sixth valve, 7-three-way valve, 8-eighth valve, 9-ninth valve.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the scope of the invention as claimed should not be limited thereby.
The invention is used for purging fuel gas in a fuel gas pipeline of a marine dual-fuel main engine, and the combustible gas in the double-wall pipe is purged after a fuel gas mode is switched from a fuel gas mode to a fuel oil mode by using high-pressure inert gas nitrogen. And for a small amount of combustible gas, the concentration of the combustible gas can be reduced, and the combustible gas is inhibited from generating chemical reaction with other gases. The inert gas nitrogen is adopted, and the storage amount of the nitrogen in the atmosphere is large.
The purging method comprises the following steps: and under the condition of normal conversion of the combustion mode or normal emergency stop, the gas in the gas pipeline is discharged in a ventilation mode, and under the condition of artificial emergency stop, the gas in the gas pipeline is discharged in a high-pressure nitrogen purging mode.
The gas pipeline is formed by double-wall pipes and is connected with a ventilation and gas purging system, referring to fig. 1, the ventilation and gas purging system comprises a first valve 1, a nitrogen inlet valve 2, a ventilation valve 3, a flowmeter 4, a fifth valve 5, a sixth valve 6, a three-way valve 7, an eighth valve 8 and a ninth valve 9. The first valve member 1, the flowmeter 4, the fifth valve member 5, the eighth valve member 8 and the host are sequentially connected, the nitrogen inlet valve 2 and the vent valve 3 are connected to the joint of the first valve member 1 and the flowmeter 4, the three-way valve 7 is connected to the joint of the fifth valve member 5 and the eighth valve member 8 through the sixth valve member 6, and the ninth valve member 9 is connected to the joint of the eighth valve member 8 and the host.
The control of the dual-fuel host gas system is divided into three working states, which are respectively as follows: a combustion mode normal switching state, an artificial emergency stop state and a normal emergency stop state.
The normal conversion state of the combustion mode refers to the mutual switching of the gas and fuel modes and the management of a main engine gas system during normal parking, at the moment, gas does not need to be blown and can be discharged outside a pipeline through a ventilation system by gas in a gas double-wall pipe system through an exhaust system in the gas system.
The principle is shown in figure 1: the first valve piece 1 and the nitrogen inlet valve 2 are closed, the vent valve 3 is opened for ventilation, the flowmeter 4 is in a normally open state, and the fifth valve piece 5 and the sixth valve piece 6 are closed, so that the gas in the pipeline shown in the figure can be ventilated through the vent valve 3, and the gas is discharged. The three-way valve 7 closes the nitrogen inlet, and the other two ports are in an open state, so that the gas in the valve is in a ventilation state. And the eighth valve element 8 and the ninth valve element 9 are opened, so that the pipeline before the pipeline reaches the main machine is in a ventilation state. The air inlet of the internal gas pipeline (double-wall pipe) of the main machine is closed, and the ventilation port is opened, so that the gas pipeline on the main machine can discharge gas.
Secondly, an artificial emergency parking state: in an emergency stop state under a certain dangerous condition or emergency state, for example, when the concentration of combustible gas is found to exceed the standard in the cabin, or local ignition occurs in the cabin, or other emergency conditions, the gas system in the main engine still works normally, but needs artificial emergency stop, and the gas in the gas system in the main engine needs emergency discharge. At the moment, the gas purging system is triggered, high-pressure nitrogen is filled into the gas pipeline, the gas is discharged out of the main machine in an emergency, and the gas system is prevented from being damaged or unexpectedly damaged by external emergency, so that the safety of the main machine and personnel is ensured.
The working principle is shown in figure 2: the first valve member 1 is closed, the nitrogen inlet valve 2 is opened, nitrogen with the pressure of 7bar is filled into the pipeline system, the vent valve 3 is closed, the flow meter 4 is unblocked, the fifth valve member 5 is opened, the sixth valve member 6 is closed, the air inlet of the three-way valve 7 is closed, the eighth valve member 8 is opened, the ninth valve member 9 is closed, and the whole gas pipeline in front of the main engine is in an unblocked state. The nitrogen can be filled into the main engine gas pipeline at a certain pressure, and the gas in the main engine gas pipeline is flushed out in an emergency state, so that the safety of the main engine is ensured.
Thirdly, a normal emergency stop state: the state refers to a state that the main machine is in a normal working state, the gas system works normally, and the main machine has to be stopped only because other systems or main equipment of the main machine have faults, for example, a certain fan or valve is damaged, the pressure low pressure of the lubricating oil system is alarmed, the main machine is stopped normally, and the like.
The working principle is the same as the normal conversion state of the first combustion mode, and the gas is discharged in a ventilation mode.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. But all equivalent changes and modifications made according to the contents of the present application should be within the technical scope of the present invention.
Claims (5)
1. A method for purging gas in a gas pipeline of a marine dual-fuel main engine is characterized in that the gas pipeline is composed of double-wall pipes and is connected with a ventilation and gas purging system, and the method comprises the following steps: the purging method comprises the following steps: and under the condition of normal conversion of the combustion mode or normal emergency stop, the gas in the gas pipeline is discharged in a ventilation mode, and under the condition of artificial emergency stop, the gas in the gas pipeline is discharged in a high-pressure nitrogen purging mode.
2. The method for purging gas in a marine dual-fuel main engine gas pipeline according to claim 1, characterized by comprising the following steps: the ventilation and gas purging system comprises a first valve, a nitrogen inlet valve, a ventilation valve, a flowmeter, a fifth valve, a sixth valve, a three-way valve, an eighth valve and a ninth valve; the first valve, the flowmeter, the fifth valve, the eighth valve and the host are sequentially connected, the nitrogen inlet valve and the vent valve are connected to the joint of the first valve and the flowmeter, the three-way valve is connected to the joint of the fifth valve and the eighth valve through the sixth valve, and the ninth valve is connected to the joint of the eighth valve and the host.
3. The method for purging gas in a marine dual-fuel main engine gas pipeline according to claim 2, characterized in that: the ventilation mode comprises the following steps: closing the first valve piece and the nitrogen inlet valve, opening the vent valve for ventilation, closing the fifth valve piece and the sixth valve piece when the flowmeter is in a normally open state, and discharging the gas in the ventilation and gas purging system pipeline through the vent valve; the three-way valve closes the nitrogen inlet and opens the other two ports to ensure that the fuel gas in the three-way valve is in a ventilation state; opening the eighth valve and the ninth valve to enable the ventilation and gas purging system pipeline in front of the main machine to be in a ventilation state; the air inlet of the gas pipeline inside the main machine is closed, the ventilation opening is opened, and gas in the gas pipeline of the main machine is discharged.
4. The method for purging gas in a marine dual-fuel main engine gas pipeline according to claim 2, characterized in that: the high-pressure nitrogen purging mode comprises the following steps: closing the first valve piece, opening the nitrogen inlet valve, closing the vent valve, keeping the flow meter unblocked, opening the fifth valve piece and the eighth valve piece, closing the sixth valve piece and the ninth valve piece, closing a nitrogen inlet of the three-way valve, inputting high-pressure nitrogen into a pipeline of the ventilation and gas purging system through the nitrogen inlet valve, filling the high-pressure nitrogen into a gas pipeline of the main machine at a certain pressure, and purging gas in the gas pipeline.
5. The method for purging gas in a marine dual-fuel main engine gas pipeline according to claim 1 or 4, characterized by comprising the following steps: the pressure of the high-pressure nitrogen is 6-10 bar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111286240.9A CN114017209B (en) | 2021-11-02 | 2021-11-02 | Purging method for fuel gas in fuel gas pipeline of marine dual-fuel host |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111286240.9A CN114017209B (en) | 2021-11-02 | 2021-11-02 | Purging method for fuel gas in fuel gas pipeline of marine dual-fuel host |
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| CN114017209A true CN114017209A (en) | 2022-02-08 |
| CN114017209B CN114017209B (en) | 2024-02-02 |
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| CN202111286240.9A Active CN114017209B (en) | 2021-11-02 | 2021-11-02 | Purging method for fuel gas in fuel gas pipeline of marine dual-fuel host |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876629A (en) * | 2022-06-08 | 2022-08-09 | 安庆中船柴油机有限公司 | Purging device and method for fuel gas in fuel gas pipeline of marine dual-fuel main engine |
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| US20150241306A1 (en) * | 2014-02-21 | 2015-08-27 | Caterpillar Motoren Gmbh & Co. Kg | Detecting misfiring in a gaseous fuel operated internal combustion engine |
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| KR20160074910A (en) * | 2014-12-19 | 2016-06-29 | 삼성중공업 주식회사 | Fuel supply system |
| CN110461706A (en) * | 2017-03-24 | 2019-11-15 | 大宇造船海洋株式会社 | Ship gas discharge system, method for discharging gas and discharge Gas recovering method |
| CN112031954A (en) * | 2020-09-08 | 2020-12-04 | 青岛双瑞海洋环境工程股份有限公司 | Double-wall pipe ventilation system of LNG power ship |
| CN113250863A (en) * | 2021-05-10 | 2021-08-13 | 河南柴油机重工有限责任公司 | High-pressure and pressure-stabilizing injection system of marine gas engine and control method |
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2021
- 2021-11-02 CN CN202111286240.9A patent/CN114017209B/en active Active
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| KR101441241B1 (en) * | 2013-04-24 | 2014-09-17 | 현대중공업 주식회사 | A Treatment System of Liquefied Natural Gas and Method for Treating Liquefied Natural Gas |
| US20150241306A1 (en) * | 2014-02-21 | 2015-08-27 | Caterpillar Motoren Gmbh & Co. Kg | Detecting misfiring in a gaseous fuel operated internal combustion engine |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114876629A (en) * | 2022-06-08 | 2022-08-09 | 安庆中船柴油机有限公司 | Purging device and method for fuel gas in fuel gas pipeline of marine dual-fuel main engine |
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| CN114017209B (en) | 2024-02-02 |
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