Nozzle cooling structure of marine ammonia-diesel dual-fuel engine

Abstract

The utility model belongs to the field of ammonia-diesel oil dual-fuel engines, and discloses a nozzle cooling structure of a marine ammonia-diesel oil dual-fuel engine. Comprising an ammonia fuel injector, a conveying pipeline for conveying an injection object to the ammonia fuel injector and a diesel injector, in the ammonia fuel mode, an injection substance supplied to the ammonia fuel injector by the conveying pipeline is ammonia fuel; in the diesel oil mode, an injection object supplied to the ammonia fuel injector by the conveying pipeline is liquid which is used for refrigeration and does not react with ammonia gas and diesel oil and is used for refrigeration. The problem of nozzle dry burning of the ammonia fuel injector in a diesel oil mode is solved, and the service life is prolonged.

Description

Technical Field

[0001] The utility model belongs to the field of ammonia-diesel dual-fuel engines, and in particular relates to a nozzle cooling structure of a marine ammonia-diesel dual-fuel engine. Background Art

[0002] Ammonia-diesel dual-fuel engines are mainly used in ocean-going ships and have two operating modes: when running in ammonia fuel mode, the diesel injector on the cylinder head plays an ignition role, the diesel injection volume is about 5% of the energy share, and the ammonia fuel injector injects the main fuel, and the ammonia injection volume is about 95% of the energy share; when running in diesel mode, the diesel injector plays the role of main fuel injection, and the diesel injection volume is 100% of the energy share. At this time, the ammonia fuel injector nozzle is in a dry burning state under the high temperature environment of the combustion chamber, and is prone to thermal damage, which has a great impact on the life of the ammonia fuel nozzle. Utility Model Content

[0003] In order to solve the above technical problems, the utility model provides a nozzle cooling structure for a marine ammonia-diesel dual-fuel engine that solves the problem of dry burning of an ammonia fuel injector nozzle in a diesel mode.

[0004] The technical solution adopted by the utility model to solve the above-mentioned technology is: to provide a nozzle cooling structure for a marine ammonia-diesel dual-fuel engine, including an ammonia fuel injector, a delivery pipeline for delivering injection material to the ammonia fuel injector, and a diesel injector; in the ammonia fuel mode, the injection material supplied by the delivery pipeline to the ammonia fuel injector is ammonia fuel; in the diesel mode, the injection material supplied by the delivery pipeline to the ammonia fuel injector is a liquid that is refrigerated and does not react with ammonia and diesel, and is used for refrigeration. In this way, the problem of dry burning of the ammonia fuel injector in the diesel mode is solved and the service life is improved.

[0005] According to the utility model, further, the ammonia fuel injector has a first feeding end and a first spraying end, the first spraying end is provided with a first nozzle, and ammonia fuel is sprayed into the engine cylinder through the first nozzle; the first feeding end is connected to the delivery pipeline.

[0006] According to the utility model, further, the delivery pipeline includes a first pipeline having one end connected to the first feed end, the other end of the first pipeline is connected to an ammonia fuel rail, the other end of the ammonia fuel rail is connected to a second pipeline, and the ammonia fuel or refrigeration liquid is sequentially delivered to the ammonia fuel injector through the second pipeline, the ammonia fuel rail and the first pipeline to achieve injection.

[0007] According to the utility model, further, the second pipeline is also connected to a liquid supply pipeline, and the refrigerant liquid is transported to the ammonia fuel injector through the liquid supply pipeline.

[0008] According to the utility model, further, the second pipeline is provided with a valve, the liquid supply pipeline is connected to the valve, and the valve controls the on-off of the liquid supply pipeline and the second pipeline. According to the utility model, further, the valve is a two-position three-way valve.

[0009] According to the utility model, further, the diesel injector has a second spraying end and a second feeding end, the second spraying end is provided with a second nozzle for spraying diesel into the engine cylinder, the second feeding end is connected to a diesel rail through a third pipeline, and the other end of the diesel rail is connected to a fourth pipeline for supplying diesel.

[0010] According to the utility model, further, the ammonia fuel mode and the diesel mode are operated alternately, thereby realizing dual-mode switching.

[0011] According to the utility model, further, the refrigeration liquid is water, which is easy to obtain, low in price, and has a good cooling effect. At the same time, a small amount of water spraying can improve NOx emissions, meeting environmental protection requirements.

[0012] Compared with the prior art, the utility model has the following beneficial effects: when the engine is switched to diesel mode, the two-position three-way valve is opened, the ammonia fuel is switched to water, the ammonia fuel and the water are mixed, and then injected into the cylinder through the ammonia fuel rail and the ammonia fuel injector, and at the same time the injection amount is reduced to the minimum stable volume injection amount of the ammonia fuel injector. After several cycles, the injection medium of the ammonia fuel injector gradually transitions from a mixture of ammonia and water to a pure water state. On the one hand, the water flows and evaporates in the nozzle, which cools the nozzle. On the other hand, in diesel mode, a small amount of water injection can improve NOx emissions, and can further optimize the fuel consumption of diesel mode Tier II. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The utility model is a schematic structural diagram of a nozzle cooling structure of a marine ammonia-diesel dual-fuel engine.

[0014] in:

[0015] 100 - engine cylinder, 200 - ammonia fuel injector, 210 - first nozzle, 220 - first pipeline, 230 - ammonia fuel rail, 240 - second pipeline, 300 - diesel injector, 310 - second nozzle, 320 - third pipeline, 330 - diesel rail, 340 - fourth pipeline, 400 - valve, 410 - liquid supply pipeline. DETAILED DESCRIPTION

[0016] The present invention is further described below in conjunction with specific embodiments. It should be understood that these embodiments are only used to illustrate the present invention and are not used to limit the scope of the present invention. In addition, it should be understood that after reading the content taught by the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the claims attached to this application.

[0017] like Figure 1 As shown, the utility model provides a nozzle cooling structure for a marine ammonia-diesel dual-fuel engine, including an engine cylinder 100, the gas inlet of the engine cylinder 100 has an injection port of an ammonia fuel injector 200 and an injection port of a diesel injector 300, and the switching between the ammonia fuel mode and the diesel mode is achieved by alternately switching the ammonia fuel injector 200 and the diesel injector 300.

[0018] The ammonia fuel injector 200 includes a first spray end and a first feed end. The first spray end is provided with a first nozzle 210, which faces the engine cylinder 100 and sprays ammonia fuel or refrigerant liquid therein. The first feed end is connected to a first pipeline 220 for supplying ammonia gas to the first nozzle 210. The other end of the first pipeline 220 is connected to an ammonia fuel rail 230. The other end of the ammonia fuel rail 230 is connected to a second pipeline 240. The ammonia fuel or refrigerant liquid enters the ammonia fuel rail 230 through the second pipeline 240, and then reaches the first nozzle 210 through the first pipeline 220, and then is sprayed into the engine cylinder 100 through the first nozzle 210 to realize the injection of ammonia fuel or refrigerant liquid. Preferably, the refrigerant liquid is water, which is easy to obtain, low in price, and has a good cooling effect.

[0019] The diesel injector 300 includes a second injection end and a second feed end. The second injection end is provided with a second nozzle 310 for injecting diesel, which is used to inject diesel into the engine cylinder 100. The second feed end is connected to a third pipeline 320 for supplying diesel to the second nozzle 310. The other end of the third pipeline 320 is connected to a diesel rail 330. The other end of the diesel rail 330 is connected to a fourth pipeline 340. The diesel is transported from the fourth pipeline 340 to the diesel rail 330, and then transported to the second nozzle 310 through the third pipeline 320, and then sprayed into the engine cylinder 100 through the second nozzle 310 to achieve diesel injection. When the engine cylinder 100 is in the ammonia fuel mode, the diesel injector 200 injects 5% diesel to play an ignition role; when the engine cylinder 100 is in the diesel mode, the diesel injection amount is 100% energy proportion.

[0020] In order to solve the problem that the nozzle of the ammonia fuel injector 200 is always in a high temperature state in the engine cylinder 100 in the diesel mode, a valve 400 is provided on the second pipeline 240 of the ammonia fuel injector 200, and a liquid supply pipeline 410 is also connected to the valve 400. In the diesel mode, the valve 400 is opened, the liquid supply pipeline 410 is connected, and water is supplied to the first pipeline 220, and reaches the first nozzle 210 after passing through the second pipeline 240, the ammonia fuel rail 230, and the first pipeline 220 in sequence, and the first nozzle 210 is kept always supplied with water, so as to avoid the first nozzle 210 from being damaged by dry burning and to increase the service life of the first nozzle 210; wherein, the amount of water supplied by the liquid supply pipeline 410 to the first pipeline 220 does not exceed 25% of the rated volume injection amount of the ammonia fuel injector 200. After several cycles, the injection medium of the ammonia fuel injector 200 gradually transitions from a mixture of ammonia and water to a pure water state. On the one hand, the water flows in the first nozzle 210, cooling the first nozzle 210; on the other hand, in the diesel mode, a small amount of water injection can improve NOx emissions, which can further optimize the diesel mode to meet the fuel consumption under the Tier II standard. In the ammonia fuel mode, the liquid supply pipeline 410 is disconnected, and only ammonia fuel is supplied to the engine cylinder 100.

[0021] It is explained here that the control of water supply is the same as that of fuel, both of which are electronic fuel injection control methods. It is a prior art that water or fuel enters the electronic ammonia fuel injector 200, and the solenoid valve in the ammonia fuel injector 200 is normally closed. The solenoid valve in the ammonia fuel injector 200 is driven by a current signal to open, and the return spring is closed. The set pulse width controls the injection duration and thus controls the fuel supply amount.

[0022] In this embodiment, the valve 400 is a two-position three-way valve, which can realize both water flow and ventilation.

[0023] The above shows and describes the basic principle, main features and advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and the specification only describe the principles of the utility model. The utility model may be subject to various changes and improvements without departing from the spirit and scope of the utility model. These changes and improvements fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine, characterized in that: It includes an ammonia fuel injector, a delivery pipeline that delivers injectants to the ammonia fuel injector, and a diesel injector; in an ammonia fuel mode, the injectant supplied by the delivery pipeline to the ammonia fuel injector is ammonia fuel; in a diesel mode, the injectant supplied by the delivery pipeline to the ammonia fuel injector is a refrigerating liquid that does not react with ammonia and diesel, and is used for refrigeration.

2. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine according to claim 1, characterized in that: The ammonia fuel injector has a first feeding end and a first spraying end. The first spraying end is provided with a first nozzle, and ammonia fuel is sprayed into the engine cylinder through the first nozzle. The first feeding end is connected to the delivery pipeline.

3. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine as claimed in claim 2, characterized in that: The delivery pipeline includes a first pipeline with one end connected to the first feed end, the other end of the first pipeline is connected to the ammonia fuel rail, and the other end of the ammonia fuel rail is connected to the second pipeline. The ammonia fuel or refrigeration liquid is sequentially delivered to the ammonia fuel injector through the second pipeline, the ammonia fuel rail and the first pipeline to achieve injection.

4. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine as claimed in claim 3, characterized in that: The second pipeline is also connected to a liquid supply pipeline, through which the refrigerant liquid is transported to the ammonia fuel injector.

5. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine as claimed in claim 4, characterized in that: The second pipeline is provided with a valve, the liquid supply pipeline is connected to the valve, and the valve controls the on-off of the liquid supply pipeline and the second pipeline.

6. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine as claimed in claim 5, characterized in that: The valve is a two-position three-way valve.

7. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine as claimed in claim 1, characterized in that: The diesel injector has a second spray end and a second feed end, the second spray end is provided with a second nozzle for spraying diesel into the engine cylinder, the second feed end is connected to a diesel rail through a third pipeline, and the other end of the diesel rail is connected to a fourth pipeline for supplying diesel.

8. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine as claimed in claim 1, characterized in that: The ammonia fuel mode and the diesel fuel mode are operated alternately.

9. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine according to any one of claims 3 to 6, characterized in that: The refrigeration liquid is water.

10. A nozzle cooling structure for a marine ammonia-diesel dual-fuel engine as claimed in claim 4, characterized in that: The amount of the refrigerant liquid injected in the cycle does not exceed 25% of the rated volume injection amount of the ammonia fuel injector.

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