1. The dual-fuel engine comprises a methanol supply system and is characterized in that the methanol supply system comprises at least two groups of methanol injection devices, the at least two groups of methanol injection devices are arranged at different positions of an air inlet pipe (12) of the dual-fuel engine, one end of the air inlet pipe (12) is connected with a radiator (6), and the other end of the air inlet pipe is connected with an air inlet manifold of the dual-fuel engine.

2. The dual fuel engine as claimed in claim 1, characterized in that two sets of the methanol injection devices are provided, and wherein one set of the methanol injection devices is provided at the connection of the intake pipe (12) and the radiator (6); and the other group of methanol injection devices are arranged at the joint of the air inlet pipe (12) and the air inlet manifold.

3. The dual fuel engine of claim 1, characterized in that at least three sets of the methanol injection devices are provided and the methanol injection devices are evenly distributed in the length direction of the intake pipe (12).

4. The dual fuel engine of claim 1, wherein any set of the methanol injection devices includes at least two methanol injectors with different injection angles.

5. The dual fuel engine of claim 4, characterized in that the injection angle of the methanol injector in any one set of the methanol injection devices covers the space inside the intake pipe (12) where it is located in the circumferential direction completely.

6. The dual fuel engine as claimed in any of the claims 1-5, characterized in that the dual fuel engine is provided with a diesel supply system, further comprising a first control unit (17) for controlling the operation of the methanol supply system and a second control unit (15) for controlling the operation of the diesel supply system.

7. The dual-fuel engine as claimed in any one of claims 1 to 5, characterized in that the dual-fuel engine is provided with a flywheel housing (20), and an air cleaner (1), an air filter bracket (2) and an auxiliary bracket (3) supporting the air filter bracket (2) are arranged above the flywheel housing (20);

air cleaner (1) install in support (2) are strained to the sky, support (2) are strained to the sky erect in flywheel casing (20) just span flywheel casing (20) set up, auxiliary stand (3) are followed the direction of height setting of support (2) is strained to the sky.

8. The dual fuel engine as claimed in claim 7, characterized in that the air filter (1) is arranged at the rear end of the dual fuel engine.

9. The dual fuel engine as claimed in any one of the claims 1 to 5, characterized in that the dual fuel engine is provided with an oil and gas separator (10) and an outlet duct (4) connected to the outlet end of the oil and gas separator (10), the outlet duct (4) being connected to the radiator (6).

10. The dual fuel engine as claimed in any of the claims 1-5, characterized in that the dual fuel engine is provided with a supercharger (9), an exhaust pipe (8) connected to the exhaust end of the supercharger (9) and an exhaust bracket (7) for supporting the exhaust pipe (8), the exhaust bracket (7) being mounted on the exhaust manifold of the dual fuel engine.

Background

As the power of the engine for power generation of the turbocharger structure is continuously increased, the heat dissipation capacity of the engine body is increased, and meanwhile, the required air input is continuously increased, which requires a lower air inlet temperature; however, due to the sealing property of the sound box, the heat of the engine body is difficult to diffuse into the environment quickly, and the heat dissipation requirement of a high-power engine cannot be met by simply adopting a conventional water heat exchanger for heat dissipation.

In the prior art, diesel engines commonly used in the market are mostly formed by modifying electric regulating pumps and mechanical pump engines with lower power, the injection pressure is low and unstable, the injection pressure cannot be adjusted according to the actual fuel pressure, the rotating speed, the load and other conditions of the engine, the pressure fluctuation of an injection system is large, the atomization effect is poor, and the engine is large in vibration, large in noise and poor in economy.

In summary, how to improve the economic performance of the dual-fuel engine is a problem to be solved urgently by those skilled in the art.

Disclosure of Invention

In view of this, an object of the present invention is to provide a dual-fuel engine, which can spray methanol at different positions of an air inlet pipe during use, so as to improve the atomization effect of the methanol, so that the methanol is sufficiently mixed with air in the air inlet pipe, and further, the mixed gas can be sufficiently combusted, thereby improving the economic performance of the dual-fuel engine.

In order to achieve the above purpose, the invention provides the following technical scheme:

a dual-fuel engine comprises a methanol supply system, wherein the methanol supply system comprises at least two groups of methanol injection devices, the at least two groups of methanol injection devices are arranged at different positions of an air inlet pipe of the dual-fuel engine, one end of the air inlet pipe is connected with a radiator, and the other end of the air inlet pipe is connected with an air inlet manifold of the dual-fuel engine.

Preferably, two groups of methanol injection devices are arranged, and one group of methanol injection devices is arranged at the joint of the air inlet pipe and the radiator; and the other group of methanol injection devices are arranged at the joint of the air inlet pipe and the air inlet manifold.

Preferably, at least three groups of methanol injection devices are arranged, and the methanol injection devices are uniformly distributed in the length direction of the air inlet pipe.

Preferably, any one set of the methanol injection devices comprises at least two methanol injectors with different injection angles.

Preferably, the injection angle of the methanol injector in any group of the methanol injection devices completely covers the space in the air inlet pipe at the position of the methanol injector in the circumferential direction.

Preferably, the dual-fuel engine is provided with a diesel supply system, and further comprises a first control unit for controlling the operation of the methanol supply system and a second control unit for controlling the operation of the diesel supply system.

Preferably, the dual-fuel engine is provided with a flywheel shell, and an air filter, an air filter support and an auxiliary support for supporting the air filter support are arranged above the flywheel shell;

the air cleaner install in empty support of straining, empty support frame of straining is located the bell housing just spanes the bell housing sets up, the auxiliary stand is followed the direction of height setting of empty support of straining.

Preferably, the air cleaner is disposed at a rear end of the dual fuel engine.

Preferably, the dual-fuel engine is provided with an oil-gas separator and an air outlet pipe connected to an air outlet end of the oil-gas separator, and the air outlet pipe is connected with the radiator.

Preferably, the dual-fuel engine is provided with a supercharger, an exhaust pipe connected to an exhaust end of the supercharger, and an exhaust bracket for supporting the exhaust pipe, and the exhaust bracket is mounted on an exhaust manifold of the dual-fuel engine.

In the process of using the dual-fuel engine provided by the invention, methanol provided by the methanol supply system needs to be mixed with air, and due to the arrangement of the at least two groups of methanol injection devices which are arranged at different positions of the air inlet pipe, in the process of mixing the methanol with the gas in the air inlet pipe, the methanol injected by the at least two groups of methanol injection devices can be mixed with the air at different positions in the air inlet pipe, so that the contact area between the methanol injected by the methanol injection devices and the gas in the air inlet pipe is increased, the atomization effect of the methanol is improved, the methanol is fully mixed with the air in the air inlet pipe, and the mixed gas can be fully combusted, thereby improving the economic performance of the dual-fuel engine; in addition, the intake pipe is connected to a radiator, and the injection of methanol can further lower the temperature of the gas flowing out of the radiator, thereby lowering the intake air temperature of the dual-fuel engine.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the provided drawings without creative efforts.

FIG. 1 is a schematic diagram of a front view of a particular embodiment of a dual fuel engine provided by the present invention;

FIG. 2 is a schematic rear view of a particular embodiment of a dual fuel engine provided by the present invention;

FIG. 3 is a schematic diagram of a top view of a particular embodiment of a dual fuel engine provided by the present invention;

fig. 4 is a left side schematic view of a specific embodiment of a dual fuel engine provided by the present invention.

In FIGS. 1-4:

the device comprises an air filter 1, an air filter support 2, an auxiliary support 3, an air outlet pipe 4, a water pump 5, a radiator 6, an exhaust support 7, an exhaust pipe 8, a supercharger 9, an oil-gas separator 10, a near-end methanol injection device 11, an air inlet pipe 12, a far-end methanol injection device 13, an engine suspension support 14, a second control unit 15, a fuel coarse filter 16, a first control unit 17, a diesel fine filter 18, a fuel pump 19, a flywheel shell 20, a high-pressure common rail 21 and a pressurizing air inlet pipeline 22.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be 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 core of the invention is to provide a dual-fuel engine, during the use process, methanol can be sprayed at different positions of the air inlet pipe, the atomization effect of the methanol is improved, the methanol is fully mixed with the air in the air inlet pipe, and the mixed gas can be fully combusted, so that the economic performance of the dual-fuel engine is improved.

Referring to fig. 1-4, fig. 1 is a schematic front view of an embodiment of a dual fuel engine provided by the present invention; FIG. 2 is a schematic rear view of a particular embodiment of a dual fuel engine provided by the present invention; FIG. 3 is a schematic diagram of a top view of a particular embodiment of a dual fuel engine provided by the present invention; fig. 4 is a left side schematic view of a specific embodiment of a dual fuel engine provided by the present invention.

The embodiment provides a dual-fuel engine, which comprises a methanol supply system, wherein the methanol supply system comprises at least two groups of methanol injection devices, the at least two groups of methanol injection devices are arranged at different positions of an air inlet pipe 12 of the dual-fuel engine, one end of the air inlet pipe 12 is connected with a radiator 6, and the other end of the air inlet pipe is connected with an air inlet manifold of the dual-fuel engine.

It should be noted that the dual-fuel engine mentioned in this document is mainly used for power generation, and in the use process, in order to make the power generation frequency constant, the output rotation speed of the dual-fuel engine needs to be controlled within a relatively stable range; of course, the dual-fuel engine mentioned in the present application document can also be used for other purposes, and is not described herein.

The methanol supply system comprises a methanol tank, a methanol pump, a methanol filter and a pressure limiting valve, and the injection of the methanol is controlled by a separate control unit.

The dual fuel engine may comprise a methanol supply system and a diesel supply system, and during use, a first control unit 17 for controlling the operation of the methanol supply system and a second control unit 15 for controlling the operation of the diesel supply system may be provided; the methanol supply system and the diesel supply system can be controlled by the first control unit 17 and the second control unit 15 respectively, so that the methanol in the methanol supply system and the diesel in the diesel supply system can be consumed simultaneously, and the cooperative control and the cooperative combustion of the methanol and the diesel are realized. Meanwhile, the dual-fuel engine has two working modes of pure diesel and methanol diesel dual-fuel simultaneous combustion, and the pure diesel mode and the dual-fuel mode can be automatically switched; preferably, the dual fuel mode supports a push-to-shut down function.

In the process of using the dual-fuel engine provided by the embodiment, the methanol provided by the methanol supply system needs to be mixed with air, and because at least two sets of methanol injection devices are arranged and arranged at different positions of the air inlet pipe 12, in the process of mixing the methanol with the gas in the air inlet pipe 12, the methanol injected by the at least two sets of methanol injection devices can be mixed with the air at different positions in the air inlet pipe 12, so that the contact area between the methanol injected by the methanol injection devices and the gas in the air inlet pipe is increased, the atomization effect of the methanol is improved, the methanol is fully mixed with the air in the air inlet pipe 12, and the mixed gas can be fully combusted, thereby improving the economic performance of the dual-fuel engine; in addition, the intake pipe 12 is connected to the radiator 6, and the injection of methanol can further lower the temperature of the gas flowing out of the radiator 6, thereby lowering the intake air temperature of the dual fuel engine.

On the basis of the above embodiment, only two sets of methanol injection devices may be provided, and one set of methanol injection device is provided at the connection between the intake pipe 12 and the radiator 6; another set of methanol injection devices is provided at the junction of the intake pipe 12 and the intake manifold.

As shown in fig. 2, the far-end methanol injection device 13 is disposed at the junction of the intake pipe 12 and the intake manifold, and the near-end methanol injection device 11 is disposed at the junction of the intake pipe 12 and the radiator 6.

Preferably, the intake pipe 12 is an intake steel pipe.

Of course, it is also possible to provide at least three sets of methanol injection devices, and the methanol injection devices are evenly distributed along the length of the intake pipe 12.

In the setting process, the number of the methanol injectors in each group of methanol injection devices can be one or more, and is determined according to actual conditions, and in the using process, under the condition that a plurality of groups of methanol injection devices are arranged, the methanol injection angles of the plurality of groups of methanol injection devices are different, so that the methanol can be fully contacted with air in the air inlet pipes 12 at different angle positions; preferably, a plurality of sets of methanol injection devices are provided, the angles of the plurality of sets of methanol injection devices for injecting methanol are different, and the angles of the plurality of sets of methanol injection devices for injecting methanol completely cover the space in the air inlet pipe 12 in the circumferential direction.

Of course, in the case where a plurality of methanol injection devices are provided, the methanol injection angles of the plurality of methanol injection devices may be the same; or methanol injection devices with the same methanol injection angle exist; or only the methanol injection angles of the adjacent methanol injection devices are different, and the like, which is determined according to the actual situation.

On the basis of the above embodiment, any set of methanol injection devices can comprise at least two methanol injectors with different injection angles. Of course, a set of methanol injection devices may be provided with only one set of methanol injectors, as determined by the actual situation.

In the case that any one of the methanol injection devices includes at least two methanol injectors with different injection angles, in order to allow the methanol to be sufficiently mixed with the air in the air inlet pipe 12, the injection angle of the methanol injector in any one of the methanol injection devices may completely cover the space in the air inlet pipe 12 where the methanol injector is located in the circumferential direction. That is, the angle range after the injection angle stack of the methanol injectors in any group of methanol injection devices can cover all the circumferential spaces in the exhaust pipe 8 at the position of the group of methanol injection devices, so that the air in the space at any angle position in the exhaust pipe 8 can be mixed with the methanol injected by the methanol injectors.

In another embodiment, in order to reduce the vibration of the air filter 1 and save the installation space, the dual-fuel engine is provided with a flywheel housing 20, and the air filter 1, the air filter bracket 2 and the auxiliary bracket 3 for supporting the air filter bracket 2 are arranged above the flywheel housing 20; air cleaner 1 installs in empty support 2 of straining, and empty support 2 of straining is erect in bell housing 20 and is spaned the bell housing 20 setting, and auxiliary stand 3 sets up along empty direction of height of straining support 2.

As shown in fig. 1, 4, empty support 2 that strains sets up across flywheel shell 20, air cleaner 1 is installed on empty support 2 of straining, because empty support 2 of straining has certain span, after installation air cleaner 1, air cleaner 1 strains the easy emergence vibration of the direction of height of support 2 in the sky, consequently, the increase sets up auxiliary stand 3, auxiliary stand 3 sets up along the empty direction of height of straining support 2, empty support 2 of straining plays certain supporting role, the vibration that reduces air cleaner 1 that can be fine, and empty support 2 of straining erects the upper portion of flywheel shell 20, can effectively save installation space.

Preferably, the air cleaner 1 is provided at the rear end of the dual fuel engine.

On the basis of the above embodiment, the dual-fuel engine is provided with the oil-gas separator 10 and the gas outlet pipe 4 connected to the gas outlet end of the oil-gas separator 10, and the gas outlet pipe 4 is connected with the radiator 6, so that the waste gas separated by the oil-gas separator 10 can be discharged along with the radiator 6, and the ice surface pollutes the mute box of the dual-fuel engine.

The dual-fuel engine is provided with a supercharger 9, an exhaust pipe 8 connected to the exhaust end of the supercharger 9 and an exhaust support 7 used for supporting the exhaust pipe 8, the exhaust support 7 is installed on an exhaust manifold of the dual-fuel engine, and the exhaust support 7 enables the exhaust pipe 8 to be installed more stably.

As shown in fig. 1-4, in another embodiment, the dual-fuel engine includes an air cleaner 1, an air filter support 2, an auxiliary support 3, an air outlet pipe 4, a water pump 5, a radiator 6, an air exhaust support 7, an air exhaust pipe 8, a supercharger 9, an oil-gas separator 10, a near-end methanol injection device 11, an air inlet pipe 12, a far-end methanol injection device 13, an engine suspension support 14, a second control unit 15, a fuel coarse filter 16, a first control unit 17, a diesel fine filter 18, a fuel pump 19, a flywheel housing 20, a high-pressure common rail 21, a pressurizing air inlet pipeline 22, and the like,

in the using process, fresh air enters the supercharger 9 through the air filter 1 and the air inlet pipe 12 of the supercharger 9, the supercharger 9 introduces the supercharged air into the radiator 6 through the exhaust pipe 8, the radiator 6 is directly fixed on the base of the dual-fuel engine, and the other end introduces the cooled intake air into an engine intake manifold through the air inlet pipe 12.

Preferably, two sets of methanol injection devices may be provided, with three methanol injectors provided in one set, and two sets of methanol injection devices arranged at both ends of the intake pipe 12 as shown in fig. 2. The split arrangement mode enables methanol to be mixed with cooled charged air more fully, reduces the air inlet temperature of the dual-fuel engine, enables methanol to be combusted more fully and is good in economical efficiency.

The cooling principle of the dual-fuel engine in fig. 1-4 is as follows: when the water temperature in the dual-fuel engine is lower than 85 ℃, the thermostat is in a closed state, and the heat dissipation of the dual-fuel engine discharges heat out of the sound box by means of a small circulation and an air-draft fan in the engine. When the temperature of water in the dual-fuel engine is higher than 85 ℃, cooling liquid is pumped out of the engine body through the water pump 5, the cooling liquid is connected into the radiator 6 through the water outlet pipe of the dual-fuel engine, the radiator 6 is fixed at the front end of the dual-fuel engine through the support, and the cooling liquid after cooling flows back into the dual-fuel engine body through the water inlet pipe of the dual-fuel engine.

It should be noted that the first and second control units in the "first control unit 17" and the "second control unit 15" mentioned in the present application are only for distinguishing the difference of the positions and are not in sequence.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. Any combination of all embodiments provided by the present invention is within the scope of the present invention, and will not be described herein.

The dual fuel engine provided by the present invention is described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.