A body phase micro-nano scale bubble flow pre-mixed fuel high pressure preparation barrel

Abstract

This invention discloses a high-pressure preparation container for bulk micro / nanoscale bubbly flow premixed fuel, belonging to the field of engine fuel pretreatment technology. The high-pressure preparation container includes a container body and a lid. The lid has an oil inlet, an air inlet, and an oil outlet. The air inlet is connected to a bubble generator located inside the container. The oil inlet supplies fuel to the high-pressure preparation container by opening and closing a one-way solenoid valve. The lid also has a pressure relief valve and a safety valve. The pressure relief valve controls the ambient pressure inside the container. When the ambient pressure exceeds a safety threshold, the safety valve opens, releasing the gas inside the container. This invention allows for flexible adjustment of the fuel preparation environment pressure, enabling the preparation of target fuel at an environmental pressure higher than atmospheric pressure, significantly improving the concentration and stability of micro / nano bubbles in the bulk micro / nanoscale bubbly flow premixed fuel.

Description

Technical Field

[0001] This invention belongs to the field of engine fuel pretreatment technology, specifically a high-pressure preparation barrel for bulk micro-nano scale bubbly flow premixed fuel. Background Technology

[0002] Most existing automotive engines are direct injection engines, which significantly reduce the fuel-air mixing time compared to port injection engines, making it difficult for the fuel and air to mix evenly.

[0003] Compared to traditional fuels, bulk micro / nanoscale bubbly flow premixed fuels, which consist of numerous hydrocarbon fuels with gas diameters less than 1 μm that are stably suspended, can potentially overcome the limitation of fuel-air mixing only within the combustion chamber by premixing the fuel and air. This could improve the uniformity of the fuel-air mixture and enhance the quality of the in-cylinder mixture. After being injected into the cylinder, the micro-explosion caused by the pressure transient and bubble rupture of the premixed fuel increases the fuel spray cone angle, reduces the spray penetration distance, and results in a more uniform distribution of fuel and air within the cylinder. This effectively improves the uniformity of the mixture, leading to increased engine thermal efficiency and reduced emissions from incomplete combustion. Currently, the preparation of bulk micro / nanoscale bubbly flow premixed fuels mainly employs methods such as external pressure infiltration through porous membrane tubes, internal pressure infiltration through porous membrane tubes, and the Venturi tube principle. However, these methods often suffer from limitations, such as the fact that the preparation environment pressure is mostly atmospheric pressure, making it impossible to achieve the goal of preparing high nanobubble concentrations under high preparation pressure conditions, and the fact that bulk micro / nanoscale bubbly flow premixed fuels are still in the laboratory bench research stage and have not yet been considered for integration with power systems. Summary of the Invention

[0004] The purpose of this invention is to provide a high-pressure preparation vessel for bulk micro / nano-scale bubbly flow premixed fuel to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A high-pressure preparation vessel for bulk micro / nanoscale bubbly flow premixed fuel includes a vessel body and a lid. The lid has an oil inlet, an air inlet, and an oil outlet. The air inlet is connected to a bubble generator located inside the vessel. The bubble generator includes a micro / nanoscale porous membrane tube holder and a micro / nanoscale porous membrane tube. The holder is installed inside the air inlet. High-pressure air is introduced into the micro / nanoscale porous membrane tube at a specific pressure through the air inlet. The oil inlet supplies fuel to the high-pressure preparation vessel by opening and closing a one-way solenoid valve. The lid also has a pressure relief valve and a safety valve. The pressure relief valve controls the ambient pressure inside the vessel. When the ambient pressure inside the vessel exceeds a safety threshold, the safety valve opens, releasing the gas inside the vessel.

[0007] Based on the above technical solutions, the present invention also provides the following optional technical solutions:

[0008] In one alternative: a composite instrument integrating a pressure regulating valve and an intake pressure gauge is installed on the outside of the air inlet; the pressure regulating valve is used to adjust the high-pressure air to be introduced into the barrel according to the set pressure, and the intake pressure gauge can display the pressure value of the high-pressure air introduced into the barrel.

[0009] In one alternative: the top of the barrel has an outwardly extending platform with a groove in it, and a sealing ring is placed in the groove.

[0010] In one alternative: after the lid fits tightly against the top platform of the barrel, it is fixedly connected by four fastening bolts distributed around the barrel body to complete the sealing of the high-pressure preparation barrel. The high-pressure preparation barrel of the bulk micro-nano scale bubbly flow premixed fuel is equipped with a pressure threshold to ensure the normal preparation of the high-pressure preparation barrel.

[0011] In one alternative: the outer side of the bucket lid is provided with seven threaded holes, one of which is located at the center of the bucket lid and serves as an air inlet, and the remaining threaded holes are distributed at equal distances and angles around the air inlet, and are respectively used to install a safety valve, a one-way solenoid valve, a pressure relief valve, a vacuum pressure gauge, a one-way solenoid valve, and a liquid level measuring device.

[0012] In one alternative: the vacuum pressure gauge is used to monitor and display the pressure value inside the tank in real time, and transmit this value to the pressure relief valve in the form of an electrical signal.

[0013] In one alternative: the liquid level measuring device is used to measure the fuel liquid level in the tank. When the liquid level in the tank reaches the set height, the liquid level measuring device sends a signal to the second solenoid valve.

[0014] A method for preparing bulk micro / nano-scale bubbly flow premixed fuel, the method being based on the aforementioned high-pressure preparation vessel for bulk micro / nano-scale bubbly flow premixed fuel, includes the following steps:

[0015] Step 1: One-way solenoid valve 2 opens, and fuel filtered by a nano-scale filter is delivered into the tank through the oil inlet. When the liquid level reaches the set height, the liquid level measuring device sends a signal, one-way solenoid valve 2 closes, and the oil supply stops.

[0016] Step 2: Adjust the pressure regulating valve to reduce the pressure of the high-pressure air to the specified preparation pressure to ensure that the high-pressure air enters the porous membrane tube at a specific pressure during the preparation process;

[0017] Step 3: Adjust the ambient pressure inside the tank to the set value; if the preparation environment pressure is atmospheric pressure, the pressure relief valve is opened with a valve opening of 100%; if the preparation environment pressure is higher than atmospheric pressure, keep the pressure relief valve closed, and when the ambient pressure inside the tank reaches the set preparation pressure, open the pressure relief valve and adjust the valve opening to ensure that the ambient pressure inside the tank is constant and to maintain the dynamic balance of pressure during the working process until the preparation is completed.

[0018] Step 4: Maintain a constant environmental pressure inside the container and continuously ventilate for preparation;

[0019] Step 5: Once the target fuel preparation is complete, the one-way solenoid valve at the oil outlet opens, and the fuel is pumped out of the high-pressure preparation tank by the low-pressure oil pump.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0021] This invention allows for flexible adjustment of the fuel preparation environment pressure, enabling the preparation of target fuels under environmental pressures higher than atmospheric pressure. This significantly increases and improves the concentration and stability of micro- and nano-bubbles in bulk micro- and nano-scale bubbly flow premixed fuels. Simultaneously, it ensures the dynamic pressure balance of the preparation atmosphere. Furthermore, this invention can be integrated with existing power systems to form a complete system for the preparation and application of bulk micro- and nano-bubbly flow premixed fuels. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the high-pressure preparation tank in one embodiment of the present invention.

[0023] Figure 2 This is a schematic diagram of the working process structure of a high-pressure preparation barrel for bulk micro / nanoscale bubbly flow premixed fuel in one embodiment of the present invention.

[0024] Figure 3 This is a schematic diagram of the bubble generating device in one embodiment of the present invention.

[0025] Figure label annotations: In the figure: 1. Bucket lid; 2. Bucket body; 3. Fastening bolt; 4. Vacuum pressure gauge; 5. Pressure relief valve; 6. Oil inlet; 7. Air inlet; 8. Pressure regulating valve; 9. Air pressure gauge; 10. Oil outlet; 11. Liquid level measuring device; 12. Safety valve; 13. Micro-nanoscale porous membrane tube fixing bracket; 14. Micro-nanoscale porous membrane tube. Implementation

[0026] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. In the drawings or description, similar or identical parts are referred to by the same reference numerals, and in practical applications, the shape, thickness, or height of each component may be enlarged or reduced. The embodiments listed in this invention are merely illustrative and not intended to limit the scope of the invention. Any obvious modifications or changes made to this invention do not depart from the spirit and scope of the invention.

[0027] In one embodiment, such as Figure 1 and Figure 3 As shown, a high-pressure preparation container for bulk micro / nanoscale bubbly flow premixed fuel includes a container body 2 and a container cover 1. The container cover 1 has an oil inlet 6, an air inlet 7, and an oil outlet 10. The air inlet 7 is connected to a bubble generating device located inside the container. The bubble generating device includes a micro / nanoscale porous membrane tube holder 13 and a micro / nanoscale porous membrane tube 14. The micro / nanoscale porous membrane tube holder 13 is installed inside the air inlet 7. High-pressure air is introduced into the micro / nanoscale porous membrane tube 14 from the air inlet 7 at a specific pressure. The oil inlet 6 supplies fuel to the high-pressure preparation container for bulk micro / nanoscale bubbly flow premixed fuel by opening and closing a one-way solenoid valve 2. The container cover 1 is also equipped with a pressure relief valve 5 and a safety valve 12. The pressure relief valve 5 is used to control the ambient pressure inside the container. When the ambient pressure inside the container exceeds a safety threshold, the safety valve 12 opens to release the gas inside the container.

[0028] In this embodiment of the invention, the high-pressure preparation barrel for bulk micro / nanoscale bubble flow premixed fuel is not limited to using combustible hydrocarbon fuels such as diesel, gasoline, biodiesel, and coal-to-oil as liquid phase carriers to prepare bulk micro / nanoscale bubble flow premixed fuel. The micro / nanoscale bubble gaseous medium uses conventional air, but is not limited to combustible or combustion-supporting gases such as oxygen and hydrogen. National VI No. 0 standard diesel is filtered through a nanoscale filter and then transported into the barrel through the inlet 6. High-pressure air is introduced into the micro / nanoscale porous membrane tube 14 at a specific pressure through the inlet 7. The gas overcomes the fuel tension on the outer wall of the micro / nanoscale porous membrane tube 14, bubbling and detaching, then floating stably in the fuel to form bulk micro / nanoscale bubble flow premixed fuel. After a period of preparation when the internal environmental pressure reaches the set environmental pressure, the bulk micro / nanoscale bubble flow premixed fuel is discharged from the high-pressure preparation barrel through the outlet 10. Micro / nanoscale bubbles with different initial particle sizes can be achieved by replacing the micro / nanoscale porous membrane tube 14 with different pore sizes.

[0029] In one embodiment, such as Figure 1As shown, a composite instrument consisting of an integrated pressure regulating valve 8 and an intake pressure gauge 9 is installed on the outside of the air inlet 7. The pressure regulating valve 8 is used to adjust the high-pressure air to be introduced into the barrel at a set pressure, and the intake pressure gauge 9 can display the pressure value of the high-pressure air introduced into the barrel. The two are used together to ensure that the high-pressure air is introduced into the barrel from the air inlet 7 at a specific pressure.

[0030] In one embodiment, such as Figure 1 As shown, the top of the barrel body 2 has a platform that extends outward by 33mm and is 14mm thick. A groove with a depth of 2mm and a width of 5mm is dug on the platform. A sealing ring is placed in the groove to ensure that the barrel body 2 and the barrel lid 1 are sealed while avoiding hard contact between the two.

[0031] After the lid 1 is tightly fitted to the top platform of the barrel body 2, it is fixedly connected by four M12 fastening bolts 3 distributed around the barrel body 2, thus completing the sealing of the high-pressure preparation barrel. The pressure threshold of the high-pressure preparation barrel for bulk micro-nano scale bubbly flow premixed fuel is designed to be 0.8 MPa. The barrel body 2 has an outer height of 450 mm, an outer diameter of 219 mm, an inner height of 435 mm, an inner diameter of 210 mm, a wall thickness of 4.5 mm, and a volume of 15 L.

[0032] In one embodiment, such as Figure 1 As shown, the barrel cover 1 has a diameter of 285mm and a thickness of 14mm. The outer side of the barrel cover 1 is equipped with seven two-point threaded holes. One of the threaded holes is located at the center of the barrel cover 1 and serves as the air inlet 7. The remaining threaded holes are distributed at equal distances and angles around the air inlet 7. The center of each threaded hole is 25mm away from the inner wall of the barrel, with an error of no more than ±1mm. They are used to install the safety valve 12, the one-way solenoid valve, the pressure relief valve 5, the vacuum pressure gauge 4, the one-way solenoid valve, and the liquid level measuring device 11, respectively.

[0033] Safety valve 12 is normally closed. Because the solubility of liquid fuel in the gas phase varies and is limited under different pressure environments, during the preparation of the target fuel, when the solubility of micro-nano bubbles reaches its limit, gas will escape from the fuel, causing a rapid rise in the internal pressure. When the pressure rises to the threshold of safety valve 12, it automatically releases pressure, ensuring the safety of the high-pressure preparation tank during operation. The threshold of safety valve 12 is 0.65 MPa, and it uses a standardized interface, allowing for the replacement of safety valves with different pressure relief thresholds depending on the required preparation environment pressure.

[0034] One-way solenoid valve 1, installed on the threaded hole, is used as oil outlet 10. One-way solenoid valve 1 is kept in a normally closed state. After the target fuel is prepared, one-way solenoid valve 1 is opened and pumped out of the high-pressure preparation tank by the low-pressure oil pump.

[0035] The pressure relief valve 5 is normally closed. When the preparation environment pressure is atmospheric pressure, the pressure relief valve 5 opens to 100%. When the preparation environment pressure is higher than atmospheric pressure, the pressure relief valve 5 remains closed. When the environment pressure inside the tank reaches the set pressure, the pressure relief valve 5 opens and automatically adjusts the valve opening to ensure that the environment pressure inside the tank is stable and constant, and to maintain the dynamic balance of pressure during operation.

[0036] In one embodiment, such as Figure 1 As shown, the vacuum pressure gauge 4 is used to monitor and display the pressure value inside the tank in real time, and transmits this value to the pressure relief valve 5 in the form of an electrical signal. The pressure relief valve 5 then automatically adjusts the valve opening to adjust the environmental pressure inside the tank, ensuring that the pressure reaches the set value.

[0037] The one-way solenoid valve 2, installed on the threaded hole, serves as the oil inlet 6 and remains normally closed. When the valve opens, fuel is injected into the high-pressure preparation tank. When the signal from the liquid level measuring device is received, the valve closes and stops supplying oil.

[0038] The liquid level measuring device 11 is used to measure the fuel liquid level in the tank. When the liquid level in the tank reaches the set height, the liquid level measuring device 11 sends a signal to the solenoid valve 2.

[0039] As attached Figure 2 An embodiment of the present invention also provides a workflow for a high-pressure preparation barrel for bulk micro / nano-scale bubbly flow premixed fuel, comprising the following steps:

[0040] Step 1: One-way solenoid valve 2 opens, and fuel filtered by a nano-scale filter is delivered into the tank through oil inlet 6. When the liquid level reaches the set height, liquid level measuring device 11 sends a signal, one-way solenoid valve 2 closes, and oil supply stops.

[0041] Step 2: Adjust the pressure regulating valve 8 to reduce the pressure of the high-pressure air to the specified preparation pressure, so as to ensure that the high-pressure air enters the porous membrane tube at a specific pressure during the preparation process;

[0042] Step 3: Adjust the ambient pressure inside the tank to the set value; if the preparation environment pressure is atmospheric pressure, the pressure relief valve 5 is opened with a valve opening degree of 100%; if the preparation environment pressure is higher than atmospheric pressure, keep the pressure relief valve 5 closed, and when the ambient pressure inside the tank reaches the set preparation pressure, the pressure relief valve 5 is opened and the valve opening degree is adjusted to ensure that the ambient pressure inside the tank remains constant and to maintain the dynamic balance of pressure during the working process until the preparation is completed.

[0043] Step 4: Maintain a constant environmental pressure inside the container and continuously ventilate for preparation;

[0044] Step 5: Once the target fuel preparation is complete, the one-way solenoid valve at oil outlet 10 is opened, and the fuel is delivered out of the high-pressure preparation tank under the action of the low-pressure oil pump.

[0045] The working principle of this invention is:

[0046] Fuel enters the barrel through inlet 6. Fueling stops after the liquid level measuring device 11 sends a signal. Then, the pressure regulating valve 8 is adjusted to reduce the pressure of high-pressure air to a specific pressure and introduce it into the barrel to prepare bulk micro-nano scale bubble flow premixed fuel. The opening of the pressure relief valve 5 is adjusted to ensure that the environmental pressure in the barrel is stable at the preset pressure. Air is continuously introduced until the target fuel preparation is completed. Then, the prepared fuel is transported out of the high-pressure preparation barrel by a low-pressure oil pump.

[0047] The above description is merely a specific embodiment of the present invention, but the scope of protection disclosed in the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection disclosed in the present invention. Therefore, the scope of protection disclosed in the present invention should be determined by the scope of the claims.

Claims

1. A method for preparing a bulk micro- and nano-scale bubbly flow premixed fuel, characterized by, The preparation method adopts a body phase micro-nano scale bubble flow premixed fuel high pressure preparation barrel to work, the barrel includes a barrel body and a barrel cover, the barrel cover is provided with an oil inlet, an air inlet and an oil outlet, the air inlet is connected with a bubble generating device arranged in the barrel; the bubble generating device includes a micro-nano scale porous membrane tube fixing frame and a micro-nano scale porous membrane tube, the micro-nano scale porous membrane tube fixing frame is installed on the inner side of the air inlet, high pressure air is introduced into the micro-nano scale porous membrane tube from the air inlet at a specific pressure, the oil inlet realizes fuel supply of the body phase micro-nano scale bubble flow premixed fuel high pressure preparation barrel through opening and closing of the oneway electromagnetic valve two; the barrel cover is further provided with a pressure relief valve and a safety valve, when the environmental pressure in the barrel exceeds a safety threshold, the safety valve is opened to release the gas in the barrel; The preparation method of the body phase micro-nano scale bubble flow premixed fuel includes the following steps: Step one: the oneway electromagnetic valve two is opened, fuel filtered by a nano filter screen is delivered into the barrel through the oil inlet, when the liquid level reaches a set height, the liquid level measurer sends a signal, the oneway electromagnetic valve two is closed, and the fuel supply is stopped; Step two: the pressure regulating valve is adjusted to reduce the high pressure air to a specified preparation pressure, so as to ensure that the high pressure air enters the porous membrane tube at a specific pressure during the preparation process; Step three: the environmental pressure in the barrel is adjusted to a set value, if the preparation environmental pressure is atmospheric pressure, the pressure relief valve is opened, and the valve opening degree is 100%; if the preparation environmental pressure is higher than the atmospheric pressure, the pressure relief valve is kept closed, when the environmental pressure in the barrel reaches the set preparation pressure, the pressure relief valve is opened and the valve opening degree is adjusted, so as to ensure that the environmental pressure in the barrel is kept constant, the dynamic balance of the pressure in the working process is maintained until the preparation is completed; Step four: the environmental pressure in the barrel is kept constant and the air is continuously introduced for preparation; Step five: when the target fuel preparation is completed, the oneway electromagnetic valve one at the oil outlet is opened, and the fuel is delivered out of the high pressure preparation barrel under the action of the low pressure oil pump.

2. The method of claim 1, wherein the method further comprises: An integrated pressure regulating valve and air inlet pressure gauge composite instrument is installed on the outer side of the air inlet, the pressure regulating valve is used to adjust the high pressure air to be introduced into the barrel at a set pressure, and the air inlet pressure gauge is used to display the pressure value of the high pressure air introduced into the barrel.

3. The method of claim 2, wherein the method further comprises: The barrel body top has an outwardly extending platform, a groove is dug on the platform, and a sealing ring is placed in the groove.

4. The method of claim 3, wherein the method further comprises: After the barrel cover is closely combined with the barrel body top platform, the sealing of the high pressure preparation barrel is completed through the fixing connection of four fastening bolts distributed around the barrel body, and the body phase micro-nano scale bubble flow premixed fuel high pressure preparation barrel is provided with a pressure bearing threshold.

5. The method of claim 4, wherein the method further comprises: Seven threaded holes are arranged on the outer side of the barrel cover, one of which is located at the center of the barrel cover and used as the air inlet, and the remaining threaded holes are distributed at equal distances and angles around the air inlet and used for installing the safety valve, the oneway electromagnetic valve one, the pressure relief valve, the vacuum pressure gauge, the oneway electromagnetic valve two and the liquid level measurer respectively.

6. The method of claim 5, wherein the method further comprises: The vacuum pressure gauge is used to monitor and display the pressure value in the barrel in real time, and the value is transmitted to the pressure relief valve in the form of an electric signal.

7. The method of claim 6, wherein the method further comprises: The liquid level measurer is used to measure the liquid level in the barrel, and sends a signal to the electromagnetic valve two when the liquid level reaches a set height.

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