A high-power methanol engine methanol gasification device

Abstract

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

Description

Technical Field

[0001] This invention relates to the field of methanol engine technology, and more specifically, to a methanol vaporization device for a high-power methanol engine. Background Technology

[0002] Methanol is convenient 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, which use 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, high-power methanol engines with over 90% methanol substitution for fuels mainly employ the following two methanol injection schemes:

[0004] Firstly, using a pressure nozzle to directly inject methanol into the engine's intake manifold results in low injection pressure and poor methanol atomization. Consequently, most of the methanol spray fails to enter the engine's combustion chamber and remains in the intake manifold. The methanol that does enter the combustion chamber is difficult to burn completely due to its low atomization and high latent heat of vaporization. Furthermore, the methanol remaining in the intake manifold accumulates and forms a runoff. When the intake or exhaust valves are open, it may enter the combustion chamber as a runoff, leading to incomplete combustion of 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 can be directly injected into the engine cylinder. However, existing methanol nozzles are large in size and difficult to install in the engine cylinder head. Furthermore, direct injection nozzles are difficult to manufacture, have high manufacturing costs, and have a short service life, which prevents them from being widely adopted.

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

[0007] In view of this, the purpose of this invention is to provide a methanol vaporization device for a high-power methanol engine, in which atomized methanol in the premixed gas is fully mixed with the pressurized air, resulting in good methanol vaporization effect, avoiding the formation of methanol droplets that flow into the engine, ensuring the combustion quality of the engine, and having a simple structure and low manufacturing cost.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A high-power methanol engine methanol vaporization device, comprising:

[0010] Methanol storage tanks used 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 boosted air inlet of the premixer is connected to the exhaust port of the engine turbocharger, is used to premix atomized methanol and boosted air;

[0014] A cyclone separator for separating methanol droplets in premixed gas, wherein 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 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 nozzle orifice 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 the tangent at the intersection of the 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 fitted inside the outer cylinder, and a heating component is provided between the inner cylinder and the outer cylinder, the heating component being used to regulate the internal temperature of the cyclone separator.

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

[0019] Preferably, an insulation layer is provided between the inner cylinder and the outer cylinder, and the heating assembly includes a heating tube for heating the liquid inside the insulation layer.

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

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

[0022] Preferably, the pressure stabilizing assembly includes a liquid methanol buffer tank, a first control valve for controlling the flow channel opening and closing 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 flow channel opening and closing 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. 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 vaporization device for a high-power methanol engine provided by this invention utilizes a methanol atomizing nozzle to atomize methanol, then premixes the atomized methanol with the boosted air compressed by the engine turbocharger to form a premixed gas, and uses a cyclone separator to separate the methanol droplets in the premixed gas. This not only ensures the vaporization effect of the methanol in the premixed gas entering the engine, but also improves the uniformity of methanol distribution in the premixed gas, and effectively prevents liquid methanol from entering the engine, thereby ensuring the quality of engine combustion and avoiding problems such as engine shutdown and lubricating oil emulsification caused by liquid methanol entering the engine.

[0025] Furthermore, the methanol vaporization device for a high-power methanol engine provided by this invention has a simple and compact structure, and does not require modification of the existing engine cylinder structure, which helps to reduce the manufacturing cost of a high-power methanol engine. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

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

[0028] Figure 2 This is a schematic diagram of a cyclone separator.

[0029] Figures 1-2 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 turbocharger; 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 Implementation

[0031] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0032] The core of this invention is to provide a methanol vaporization device for a high-power methanol engine. The atomized methanol in the premixed gas is fully mixed with the pressurized air, resulting in good methanol vaporization effect. This avoids methanol droplets forming runoff that flows into the engine, ensuring the combustion quality of the engine. Moreover, the device has a simple structure and low manufacturing cost.

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

[0034] Methanol storage tank 1 for storing methanol;

[0035] Air compressor 2, used to produce compressed air;

[0036] Methanol atomizing nozzle 3, methanol inlet 31 of methanol atomizing nozzle 3 is connected to methanol storage tank 1, and compressed air inlet 32 ​​of methanol atomizing nozzle 3 is connected to air compressor 2.

[0037] The premixer 4 has an atomized methanol inlet connected to the atomized methanol outlet of the methanol atomizing nozzle 3, and a boosted air inlet 41 connected to the exhaust port 61 of the engine turbocharger 6, for premixing atomized methanol and boosted air.

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

[0039] Among them, methanol storage tank 1 is used to store methanol, air compressor 2 is used to generate compressed air, methanol and compressed air enter methanol atomizing nozzle 3 through methanol inlet 31 and compressed air inlet 32 ​​respectively, and form atomized methanol in 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 multi-hole nozzle, and the straight line of the nozzle orifice is not parallel to the axis of the methanol inlet 31, so that the compressed air is mixed with methanol at a certain angle through the multi-hole nozzle, thereby improving the atomization effect of 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 the multi-hole nozzle at the methanol inlet 31.

[0042] The methanol atomizing nozzle 3 has its methanol atomizing outlet connected to the premixer 4, and the exhaust port 61 of the engine turbocharger 6 is connected to the pressurized air inlet 41 of the premixer 4, so that the atomized methanol and 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 throws the methanol droplets in the premixed gas to the inner wall surface of the cyclone separator 5 by centrifugal force. Then, the methanol droplets flow to the bottom of the cyclone separator 5 under the action of gravity and flow back to the methanol storage tank 1 through the liquid methanol outlet at the bottom of the cyclone separator 5.

[0044] Meanwhile, the cyclone separator 5 can further mix the premixed gas, improve the uniformity of methanol distribution in the premixed gas, and thus reduce the fluctuations in 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 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 inside 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 and prevent the internal pressure loss of the cyclone separator 5 from affecting the separation effect of methanol droplets in the premixed gas.

[0047] Preferably, the cyclone separator 5 may include a pressure sensor for detecting 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 the internal pressure loss of the cyclone separator 5 is alarmed by the control device of the methanol vaporization device or an alarm component such as a buzzer.

[0048] In this embodiment, methanol is atomized using a methanol atomizing nozzle 3, and then the atomized methanol and the pressurized air compressed by the engine turbocharger 6 are premixed in a premixer 4 to form a premixed gas. A cyclone separator 5 is used to separate the methanol droplets in the premixed gas. This not only ensures the vaporization effect of the methanol in the premixed gas entering the engine 7, but also improves the uniformity of methanol distribution in the premixed gas. It also 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 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 helps to reduce the manufacturing cost of high-power methanol engines.

[0050] Based on the above embodiments, in order to improve the combustion quality of engine 7, a cyclone separator 5 can be provided, including an outer cylinder and an inner cylinder sleeved inside the outer cylinder. 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 engine 7 is improved by increasing the intake air temperature.

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

[0052] Alternatively, the outer cylinder can be equipped with an inlet 51 for connecting to the engine coolant outlet 73 and an outlet 52 for connecting to the engine coolant 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 heat loss.

[0053] Please refer to Figure 2 In order to ensure the heating and insulation effect of the insulation layer on the premixed gas in the inner cylinder, the water inlet 51 of the cyclone separator 5 is usually located at the bottom, while the water outlet 52 of the cyclone separator 5 is located 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 that of the premixed gas inlet.

[0054] To facilitate the control of the temperature of the insulation layer between the inner and outer cylinders, preferably, a high-temperature water pipe can be provided between the water inlet 51 and the engine cooling water outlet 73. The high-temperature water pipe is equipped with a flow control valve for controlling the flow rate of the high-temperature water, so as to adjust the temperature of the insulation layer by adjusting the flow rate of the high-temperature water, thereby adjusting the internal temperature of the cyclone separator 5.

[0055] In this embodiment, the heating component can increase the internal temperature of the cyclone separator 5, causing the methanol droplets in the premixed gas to vaporize rapidly and increasing the concentration of methanol in the premixed gas.

[0056] Preferably, a temperature sensor for detecting the internal temperature of the cyclone separator 5 can be provided inside the inner cylinder. The temperature sensor is connected to the heating component to perform negative feedback regulation of the internal temperature of the cyclone separator 5.

[0057] Based on the above embodiments, the structure of the pressure stabilizing component is further defined. The pressure stabilizing component includes a liquid methanol buffer tank 82. A first control valve 81 for controlling the flow channel opening and closing 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 channel opening and closing is provided between the liquid methanol buffer tank 82 and the methanol storage tank 1. Figure 2 As shown.

[0058] In this configuration, both the first control valve 81 and the second control valve 83 are shut-off valves. To facilitate the automated control of the methanol gasification unit, both the first control valve 81 and the second control valve 83 are usually set to be automatic control valves such as solenoid valves.

[0059] The first control valve 81 is normally open and the second control valve 83 is normally closed, 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 level, or after 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 closed 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 at the top and bottom of the liquid methanol buffer tank 82 control the opening and closing of the pipeline between the liquid methanol buffer tank 82 and the liquid methanol outlet of the cyclone separator 5 and the return 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 can also be omitted, and only the first control valve 81 and the second control valve 83 can be set between the liquid methanol outlet of the cyclone separator 5 and the return port of the methanol storage tank 1, and the liquid methanol can be temporarily stored through the pipeline between the two control valves.

[0063] It should be noted that the first and second in the first control valve 81 and the second control valve 83 mentioned in this application are only used to distinguish the different positions and do not contain any limitation on the order.

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

[0065] The high-power methanol engine methanol vaporization device provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are only for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make several improvements and modifications to this invention without departing from the principles of this invention, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A high-power methanol engine methanol vaporization device, characterized in that, include: Methanol storage tank (1) for storing methanol. Air compressors used to produce compressed air (2); A methanol atomizing nozzle (3) is provided, with its methanol inlet (31) connected to the methanol storage tank (1) and its compressed air inlet (32) connected to the air compressor (2). The premixer (4) has an atomized methanol inlet connected to the atomized methanol outlet of the methanol atomizing nozzle (3), and a booster air inlet (41) connected to the exhaust port (61) of the engine turbocharger (6) for premixing atomized methanol and booster air. A cyclone separator (5) is used to separate methanol droplets in a 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).

2. The high-power methanol engine methanol vaporization device 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 nozzle orifice is not parallel to the axis of the methanol inlet (31).

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

4. The high-power methanol engine methanol vaporization device according to any one of claims 1-3, characterized in that, The cyclone separator (5) includes an outer cylinder and an inner cylinder fitted inside 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 high-power methanol engine methanol vaporization device according to claim 4, characterized in that, The inner cylinder is equipped with a temperature sensor for detecting the internal temperature of the cyclone separator (5). The temperature sensor is connected to the heating component to perform negative feedback regulation on the internal temperature of the cyclone separator (5).

6. The high-power methanol engine methanol vaporization device according to claim 4, characterized in that, An insulation layer is provided between the inner cylinder and the outer cylinder, and the heating assembly includes a heating tube for heating the insulation medium within the insulation layer.

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

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

9. The high-power methanol engine methanol vaporization device according to any one of claims 1-3, characterized in that, The pressure stabilizing assembly includes a liquid methanol buffer tank (82), a first control valve (81) for controlling the flow channel opening and closing 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 flow channel opening and closing is provided between the liquid methanol buffer tank (82) and the methanol storage tank (1).

10. The high-power methanol engine methanol vaporization device according to any one of claims 1-3, characterized in that, The cyclone separator (5) includes a pressure sensor for detecting 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.

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