Methanol gasification device of high-power methanol engine

Abstract

The invention discloses a methanol gasification device of a high-power methanol engine, and relates to the technical field of methanol engines. An air compressor; a methanol inlet of the methanol atomizing nozzle is connected with the methanol storage tank, and a compressed air inlet of the methanol atomizing nozzle is connected with the air compressor; an atomized methanol inlet of the premixer is connected with an atomized methanol outlet of the methanol atomizing nozzle, a pressurized air inlet of the premixer is connected with an exhaust port of an engine supercharger, and the premixer is used for premixing atomized methanol and pressurized air; the cyclone separator is used for separating methanol liquid drops in the premixed gas, a premixed gas inlet of the cyclone separator is connected with a premixed gas outlet of the premixer, a gas outlet of the cyclone separator is connected with a gas inlet of the engine, and the cyclone separator is connected with the methanol storage tank through a pressure stabilizing assembly so that the separated methanol liquid drops can flow back into the methanol storage tank. The methanol gasification device is good in methanol gasification effect, simple in structure and low in manufacturing cost.

Description

Technical Field

[0001] The present invention relates to the technical field of methanol engines, and more particularly to a methanol gasification device for a high-power methanol engine. Background Art

[0002] Methanol is easy to store and transport and has low operating costs, making it an ideal green energy source for high-power engines. However, high-power engines are all dual-fuel engines, using both diesel and methanol. The methanol substitution rate for diesel is less than 60%, resulting in high diesel consumption and high operating costs.

[0003] Currently, the methanol injection schemes for high-power methanol engines with methanol replacement rates exceeding 90% mainly include the following two options:

[0004] First, using a pressure nozzle to spray methanol directly into the engine's intake duct has a low injection pressure and poor methanol atomization, resulting in most of the methanol spray being unable to enter the engine's combustion chamber and remaining in the intake duct. The methanol that does enter the combustion chamber is difficult to fully burn due to its low atomization degree and high latent heat of vaporization. At the same time, the methanol remaining in the intake duct accumulates and forms runoff. When the intake valve or exhaust valve is opened, it may flow into the combustion chamber in the form of runoff, resulting in incomplete combustion of the methanol, or even extinguishing the combustion chamber flame and causing the engine to stop. In addition, the liquid methanol flowing into the combustion chamber will mix with the lubricating oil in the engine, causing lubricating oil emulsification problems.

[0005] Secondly, methanol is directly injected into the engine cylinder, but the existing methanol nozzle is large in size and difficult to arrange in the engine cylinder head. In addition, the direct injection nozzle is difficult to process, has high processing costs, and has a short service life, so it cannot be widely promoted and applied.

[0006] In summary, how to provide a methanol gasification device with good combustion quality and low cost is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0007] In view of this, the purpose of the present invention is to provide a methanol gasification device for a high-power methanol engine, in which the atomized methanol in the premixed gas is fully mixed with the compressed air, the methanol gasification effect is good, and the formation of methanol droplets to flow into the engine is avoided, thereby ensuring the combustion quality of the engine. It also has a simple structure and low manufacturing cost.

[0008] In order to achieve the above object, the present invention provides the following technical solutions:

[0009] A methanol gasification device for a high-power methanol engine, comprising:

[0010] Methanol storage tanks for storing methanol;

[0011] Air compressors used to produce compressed air;

[0012] a methanol atomizing nozzle, wherein the methanol inlet of the methanol atomizing nozzle is connected to the methanol storage tank, and the compressed air inlet of the methanol atomizing nozzle is connected to the air compressor;

[0013] a premixer, wherein the atomized methanol inlet of the premixer is connected to the atomized methanol outlet of the methanol atomizing nozzle, and the pressurized air inlet of the premixer is connected to the exhaust port of the engine supercharger, for premixing the atomized methanol and the pressurized air;

[0014] A cyclone separator is used to separate methanol droplets in the premixed gas, the premixed gas inlet of the cyclone separator is connected to the premixed gas outlet of the premixer, the gas outlet of the cyclone separator is connected to the engine air inlet, and the cyclone separator is connected to the methanol storage tank through a pressure stabilizing component so that the separated methanol droplets can flow back into the methanol storage tank.

[0015] Preferably, the compressed air inlet of the methanol atomizing nozzle is provided with a multi-hole nozzle, and the axis of the spray hole of the multi-hole nozzle is not parallel to the axis of the methanol inlet.

[0016] Preferably, the axis of the premixed gas inlet of the cyclone separator is parallel to a tangent line at an intersection of an outer peripheral surface of the cyclone separator and the axis of the premixed gas inlet.

[0017] Preferably, the cyclone separator includes an outer cylinder and an inner cylinder sleeved in the outer cylinder, a heating component is provided between the inner cylinder and the outer cylinder, and the heating component is used to adjust the internal temperature of the cyclone separator.

[0018] Preferably, a temperature sensor for detecting the internal temperature of the cyclone separator is provided in the inner cylinder, and the temperature sensor is connected to the heating component signal to perform negative feedback regulation on the internal temperature of the cyclone separator.

[0019] Preferably, a heat-insulating layer is provided between the inner cylinder and the outer cylinder, and the heating assembly comprises a heating pipe for heating the liquid in the heat-insulating layer.

[0020] Preferably, the outer cylinder is provided with a water inlet for connecting to the engine cooling water outlet and a water outlet for connecting to the engine cooling water inlet.

[0021] Preferably, a high-temperature water pipeline is provided between the water inlet and the engine cooling water outlet, and the high-temperature water pipeline is provided with a flow control valve for controlling the flow of high-temperature water in the high-temperature water pipeline.

[0022] Preferably, the pressure stabilizing component includes a liquid methanol buffer tank, a first control valve for controlling the on-off of the flow channel is provided between the liquid methanol buffer tank and the liquid methanol outlet of the cyclone separator, and a second control valve for controlling the on-off of the flow channel is provided between the liquid methanol buffer tank and the methanol storage tank.

[0023] Preferably, the cyclone separator includes a pressure sensor for detecting internal air pressure, and when the internal air pressure of the cyclone separator measured by the pressure sensor is lower than a preset pressure value, the pressure sensor outputs a pressure alarm signal.

[0024] The methanol gasification device for a high-power methanol engine provided by the present invention utilizes a methanol atomizing nozzle to atomize methanol, and then premixes the atomized methanol with the boost air compressed by the engine supercharger to form a premixed gas, and utilizes a cyclone separator to separate methanol droplets in the premixed gas. This ensures the gasification effect of the methanol in the premixed gas entering the engine, improves the uniformity of the distribution of the methanol in the premixed gas, and effectively prevents liquid methanol from entering the engine, thereby ensuring the combustion quality of the engine and avoiding problems such as engine shutdown and lubricating oil emulsification caused by liquid methanol entering the engine.

[0025] In addition, the methanol gasification device for a high-power methanol engine provided by the present invention has a simple and compact structure and does not require changes to the existing engine cylinder structure, which is beneficial to reducing the manufacturing cost of the high-power methanol engine. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0027] Figure 1 This is a schematic structural diagram of a specific embodiment of the methanol gasification device for a high-power methanol engine provided by the present invention;

[0028] Figure 2 Schematic diagram of the structure of a cyclone separator.

[0029] Figure 1-Figure 2 middle:

[0030] 1-Methanol storage tank; 2-Air compressor; 3-Methanol atomizing nozzle; 31-Methanol inlet; 32-Compressed air inlet; 4-Premixer; 41-Boost air inlet; 5-Cyclone separator; 51-Water inlet; 52-Water outlet; 53-Air outlet; 6-Engine supercharger; 61-Exhaust port; 7-Engine; 71-Engine air inlet; 72-Engine cooling water inlet; 73-Engine cooling water outlet; 81-First control valve; 82-Liquid methanol buffer tank; 83-Second control valve. DETAILED DESCRIPTION

[0031] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0032] The core of the present invention is to provide a methanol gasification device for a high-power methanol engine. The atomized methanol in the premixed gas is fully mixed with the pressurized air, and the methanol gasification effect is good, which avoids the formation of methanol droplets and runoff flowing into the engine, thereby ensuring the combustion quality of the engine. It also has a simple structure and low manufacturing cost.

[0033] The high-power methanol engine methanol gasification device provided by the present invention comprises:

[0034] A methanol storage tank 1 for storing methanol;

[0035] An air compressor 2 for producing compressed air;

[0036] A methanol atomizing nozzle 3, wherein a methanol inlet 31 of the methanol atomizing nozzle 3 is connected to the methanol storage tank 1, and a compressed air inlet 32 of the methanol atomizing nozzle 3 is connected to the air compressor 2;

[0037] A premixer 4, wherein the atomized methanol inlet of the premixer 4 is connected to the atomized methanol outlet 3 of the methanol atomizing nozzle, and the pressurized air inlet 41 of the premixer 4 is connected to the exhaust port 61 of the engine supercharger 6, for premixing the atomized methanol and the pressurized air;

[0038] A cyclone separator 5 is used to separate methanol droplets in the premixed gas. The premixed gas inlet of the cyclone separator 5 is connected to the premixed gas outlet of the premixer 4. The outlet 53 of the cyclone separator 5 is connected to the engine air inlet 71. The cyclone separator 5 is connected to the methanol storage tank 1 through a pressure stabilizing component so that the separated methanol droplets can flow back into the methanol storage tank 1.

[0039] The methanol storage tank 1 is used to store methanol, and the air compressor 2 is used to produce compressed air. Methanol and compressed air enter the methanol atomizing nozzle 3 through the methanol inlet 31 and the compressed air inlet 32 respectively, and form atomized methanol in the methanol atomizing nozzle 3;

[0040] The specific type, structure and atomization accuracy of the methanol atomizing nozzle 3 are determined according to the design parameters of the methanol engine in actual production; preferably, the compressed air inlet 32 of the methanol atomizing nozzle 3 is provided with a porous nozzle, and the spray hole straight line of the porous nozzle is not parallel to the axis of the methanol inlet 31, so that the compressed air passes through the porous nozzle at a certain angle and mixes with the methanol, thereby improving the atomization effect of the methanol.

[0041] Preferably, in order to further improve the atomization effect of methanol, a methanol pump for pressurizing methanol can be provided between the methanol storage tank 1 and the methanol inlet 31 of the methanol atomizing nozzle 3, and the methanol can be sprayed into the methanol atomizing nozzle 3 through a porous nozzle at the methanol inlet 31.

[0042] The atomized methanol outlet of the methanol atomizing nozzle 3 is connected to the premixer 4, and the exhaust port 61 of the engine supercharger 6 is connected to the pressurized air inlet 41 of the premixer 4, so that the atomized methanol and the pressurized air are premixed in the premixer 4 to form a premixed gas.

[0043] The premixed gas outlet of the premixer 4 is connected to the premixed gas inlet of the cyclone separator 5. The premixed gas rotates at high speed in the cyclone separator 5 to form a high-speed rotating airflow. The cyclone separator 5 uses centrifugal force to throw the methanol droplets in the premixed gas to the inner wall surface of the cyclone separator 5. Then, the methanol droplets flow to the bottom of the cyclone separator 5 under the action of gravity and flow back into the methanol storage tank 1 through the liquid methanol outlet at the bottom of the cyclone separator 5.

[0044] At the same time, the cyclone separator 5 can further mix the premixed gas, improve the uniformity of distribution of methanol in the premixed gas, and thus reduce the fluctuation of combustion quality and output power of the engine 7 caused by the difference in methanol concentration in the premixed gas.

[0045] Preferably, in order to improve the separation effect of the cyclone separator 5, the axis of the premixed gas inlet of the cyclone separator 5 can be set to be parallel to the tangent line at the intersection of the outer peripheral surface of the cyclone separator 5 and the axis of the premixed gas inlet.

[0046] It should be noted that in order to ensure the normal rotational separation process in the cyclone separator 5, a pressure stabilizing component is provided between the liquid methanol outlet at the bottom of the cyclone separator 5 and the methanol storage tank 1. The pressure stabilizing component is used to maintain the internal air pressure of the cyclone separator 5 to avoid the internal pressure loss of the cyclone separator 5 affecting the separation effect of the methanol droplets in the premixed gas.

[0047] Preferably, the cyclone separator 5 can be provided with a pressure sensor for detecting the internal air pressure. When the internal air pressure of the cyclone separator 5 measured by the pressure sensor is lower than a preset pressure value, the pressure sensor outputs a pressure alarm signal, and an alarm is issued for the internal pressure loss of the cyclone separator 5 through an alarm component such as a control device of the methanol gasification device or a buzzer.

[0048] In this embodiment, methanol is atomized using a methanol atomizing nozzle 3, and then the atomized methanol and the compressed air compressed by the engine supercharger 6 are premixed in a premixer 4 to form a premixed gas, and the methanol droplets in the premixed gas are separated by a cyclone separator 5. This not only ensures the gasification effect of the methanol in the premixed gas entering the engine 7, but also improves the uniformity of the distribution of the methanol in the premixed gas, and effectively prevents liquid methanol from entering the engine 7, thereby ensuring the combustion quality of the engine 7 and avoiding problems such as engine 7 shutdown and lubricating oil emulsification caused by liquid methanol entering the engine 7.

[0049] In addition, the above-mentioned methanol gasification device has a simple and compact structure and does not require changes to the existing engine cylinder structure, such as the cylinder head structure, which is conducive to reducing the manufacturing cost of high-power methanol engines.

[0050] On the basis of the above embodiment, in order to improve the combustion quality of the engine 7, a cyclone separator 5 can be provided including an outer cylinder and an inner cylinder arranged in the outer cylinder, and a heating component is provided between the inner cylinder and the outer cylinder. The heating component is used to adjust the internal temperature of the cyclone separator 5. By increasing the internal temperature of the cyclone separator 5, the proportion of methanol droplets in the premixed gas is reduced, and the combustion quality of the engine 7 is improved by increasing the intake temperature.

[0051] Among them, an insulation layer is provided between the inner cylinder and the outer cylinder of the cyclone separator 5. The insulation medium in the insulation layer, such as circulating water, heats and insulates the premixed gas in the inner cylinder. The heating component may include a heating pipe for heating the liquid in the insulation layer, such as an electric heating pipe.

[0052] The outer cylinder may also be provided with a water inlet 51 for connecting to the engine cooling water outlet 73 and a water outlet 52 for connecting to the engine cooling water inlet 72, such as Figure 1 As shown, the engine cooling water is used to heat and keep the cyclone separator 5 warm through the waste heat of the engine 7, so as to improve the thermal efficiency of the engine 7 and reduce the heat energy loss.

[0053] Please refer to Figure 2 In order to ensure the heating and heat preservation effect of the insulation layer on the premixed gas in the inner cylinder, the water inlet 51 of the cyclone separator 5 is usually set at the bottom, and the water outlet 52 of the cyclone separator 5 is set at the top, and the height of the water outlet 52 is higher than the height of the premixed gas inlet, so as to ensure that the liquid level of the insulation medium in the insulation layer is higher than the premixed gas inlet.

[0054] In order to facilitate the control of the temperature of the insulation layer between the inner and outer cylinders, it is preferred that a high-temperature water pipe be provided between the water inlet 51 and the engine cooling water outlet 73, and the high-temperature water pipe be provided with a flow control valve for controlling the high-temperature water flow in the high-temperature water pipe, so as to adjust the temperature of the insulation layer by adjusting the high-temperature water flow, and thereby adjust the internal temperature of the cyclone separator 5.

[0055] In this embodiment, the provision of the heating component can increase the internal temperature of the cyclone separator 5, so that the methanol droplets in the premixed gas are quickly vaporized, thereby increasing the concentration of methanol in the premixed gas.

[0056] Preferably, a temperature sensor for detecting the internal temperature of the cyclone separator 5 may be provided in the inner cylinder, and the temperature sensor is connected to the heating component signal to perform negative feedback regulation on the internal temperature of the cyclone separator 5 .

[0057] On the basis of the above embodiment, the structure of the pressure stabilizing component is defined. The pressure stabilizing component includes a liquid methanol buffer tank 82. A first control valve 81 for controlling the flow passage is provided between the liquid methanol buffer tank 82 and the liquid methanol outlet of the cyclone separator 5. A second control valve 83 for controlling the flow passage is provided between the liquid methanol buffer tank 82 and the methanol storage tank 1. Figure 2 shown.

[0058] The first control valve 81 and the second control valve 83 are both stop valves. To facilitate the automated control of the methanol gasification device, the first control valve 81 and the second control valve 83 are usually both automatic control valves such as solenoid valves.

[0059] The first control valve 81 is in a normally open state, and the second control valve 83 is in a normally closed state, so that the liquid methanol separated by the cyclone separator 5 flows into the liquid methanol buffer tank 82 for buffering;

[0060] When the liquid level in the liquid methanol buffer tank 82 reaches the preset liquid level, or the opening time of the first control valve 81 reaches the preset time, in order to prevent the liquid methanol from exceeding the capacity of the liquid methanol buffer tank 82, the first control valve 81 is controlled to close, and the second control valve 83 is controlled so that the liquid methanol in the liquid methanol buffer tank 82 flows back to the methanol storage tank 1.

[0061] In this embodiment, the two control valves above and below the liquid methanol buffer tank 82 are used to control the connection and disconnection of the pipeline between the liquid methanol buffer tank 82 and the liquid methanol outlet of the cyclone separator 5 and the reflux port of the methanol storage tank 1. The structure is simple and effectively stabilizes the internal air pressure of the cyclone separator 5.

[0062] Of course, the liquid methanol buffer tank 82 may be eliminated, and only the first control valve 81 and the second control valve 83 are provided between the liquid methanol outlet of the cyclone separator 5 and the reflux port of the methanol storage tank 1 , and the liquid methanol is temporarily stored through the pipeline between the two control valves.

[0063] It should be noted that the first and second control valves 81 and 83 mentioned in this application are only used to distinguish the difference in position and do not limit the order.

[0064] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0065] The above describes in detail the methanol gasification device for a high-power methanol engine provided by the present invention. Specific examples are used herein to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is intended only to facilitate understanding of the method and core concepts of the present invention. It should be noted that those skilled in the art may make various improvements and modifications to the present invention without departing from the principles of the present invention, and such improvements and modifications fall within the scope of protection of the claims of the present invention.

Claims

1. A methanol gasification device for a high-power methanol engine, characterized in that: include: A methanol storage tank (1) for storing methanol; Air compressor for producing compressed air (2); A methanol atomizing nozzle (3), wherein the methanol inlet (31) of the methanol atomizing nozzle (3) is connected to the methanol storage tank (1), and the compressed air inlet (32) of the methanol atomizing nozzle (3) is connected to the air compressor (2); A premixer (4), wherein the atomized methanol inlet of the premixer (4) is connected to the atomized methanol outlet of the methanol atomizing nozzle (3), and the pressurized air inlet (41) of the premixer (4) is connected to the exhaust port (61) of the engine supercharger (6), for premixing the atomized methanol and the pressurized air; A cyclone separator (5) is used to separate methanol droplets in a premixed gas, wherein the premixed gas inlet of the cyclone separator (5) is connected to the premixed gas outlet of the premixer (4), the gas outlet (53) of the cyclone separator (5) is connected to the engine air inlet (71), and the cyclone separator (5) is connected to the methanol storage tank (1) via a pressure stabilizing component so that the separated methanol droplets flow back into the methanol storage tank (1).

2. The methanol gasification device for a high-power methanol engine according to claim 1, characterized in that: The compressed air inlet (32) of the methanol atomizing nozzle (3) is provided with a multi-hole nozzle, and the axis of the spray hole of the multi-hole nozzle is not parallel to the axis of the methanol inlet (31).

3. The methanol gasification device for a high-power methanol engine according to claim 1, characterized in that: The axis of the premixed gas inlet of the cyclone separator (5) is parallel to a tangent line at an intersection of the outer peripheral surface of the cyclone separator (5) and the axis of the premixed gas inlet.

4. The methanol gasification device for a high-power methanol engine according to any one of claims 1 to 3, characterized in that: The cyclone separator (5) comprises an outer cylinder and an inner cylinder sleeved in the outer cylinder, a heating component is provided between the inner cylinder and the outer cylinder, and the heating component is used to adjust the internal temperature of the cyclone separator (5).

5. The methanol gasification device for a high-power methanol engine according to claim 4, characterized in that: A temperature sensor for detecting the internal temperature of the cyclone separator (5) is provided in the inner cylinder, and the temperature sensor is connected to the heating component signal to perform negative feedback regulation on the internal temperature of the cyclone separator (5).

6. The methanol gasification device for a high-power methanol engine according to claim 4, characterized in that: A heat-insulating layer is provided between the inner cylinder and the outer cylinder, and the heating assembly comprises a heating pipe for heating the heat-insulating medium in the heat-insulating layer.

7. The methanol gasification device for a high-power methanol engine according to claim 4, characterized in that: The outer cylinder is provided with a water inlet (51) for connecting to an engine cooling water outlet (73) and a water outlet (52) for connecting to an engine cooling water inlet (72).

8. The methanol gasification device for a high-power methanol engine according to claim 7, characterized in that: A high-temperature water pipeline is provided between the water inlet (51) and the engine cooling water outlet (73), and the high-temperature water pipeline is provided with a flow control valve for controlling the flow of high-temperature water in the high-temperature water pipeline.

9. The methanol gasification device for a high-power methanol engine according to any one of claims 1 to 3, characterized in that: The pressure stabilizing assembly comprises a liquid methanol buffer tank (82), a first control valve (81) for controlling the on-off of a flow passage is provided between the liquid methanol buffer tank (82) and the liquid methanol outlet of the cyclone separator (5), and a second control valve (83) for controlling the on-off of a flow passage is provided between the liquid methanol buffer tank (82) and the methanol storage tank (1).

10. The methanol gasification device for a high-power methanol engine according to any one of claims 1 to 3, characterized in that: The cyclone separator (5) comprises a pressure sensor for detecting internal air pressure, and when the internal air pressure of the cyclone separator (5) measured by the pressure sensor is lower than a preset pressure value, the pressure sensor outputs a pressure alarm signal.

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