Microwave liquid nitrogen vaporization device, liquid nitrogen power converter and power generation system

Abstract

The present invention relates to the field of liquid nitrogen application technology, and provides a microwave liquid nitrogen vaporization device, a liquid nitrogen power converter, and a power generation system. The microwave liquid nitrogen vaporization device comprises: a housing having a vaporization chamber disposed therein, and a nitrogen gas output pipe connected to the vaporization chamber; a feed assembly comprising a plurality of feed pipes, each of which is connected to the top of the housing and connected to the vaporization chamber; a microwave generating assembly comprising at least two or more microwave generators disposed on opposite sides of the housing for emitting microwaves into the vaporization chamber; and an absorbing assembly comprising a plurality of graphene absorbing components disposed within the vaporization chamber, each of which is disposed below the connection between the corresponding feed pipe and the housing and absorbs microwave energy emitted by the microwave generating assembly. Compared with the prior art, the present invention converts the stored energy of liquid nitrogen into mechanical energy, is energy-saving and environmentally friendly, meets the requirements for backup energy use, and enables secondary applications of liquid nitrogen.

Description

Technical Field

[0001] The present invention relates to the technical field of liquid nitrogen applications, and in particular to a microwave liquid nitrogen vaporization device, a liquid nitrogen power converter, and a power generation system. Background Art

[0002] Human society is now inseparable from electricity. Electricity is essential for lighting, power systems, smart devices, networks, and smart grids, impacting every aspect of our lives. However, sudden power outages and the waste of electricity from clean energy generation devices during peak and off-peak periods still occur. In factories, power outages can halt production, resulting in significant losses and waste. Furthermore, in remote areas, power outages are difficult to repair, leading to prolonged outages and significant inconvenience.

[0003] Liquid nitrogen is a promising renewable energy source that can be used for refrigerating food, as a refrigerant, preserving biological specimens, and as a power source after vaporization. Its boiling point is -195.8°C, and its gaseous stability is strong, offering promising applications. However, the current application of liquid nitrogen is generally difficult, primarily due to its freezing properties, which are highly restrictive and make secondary applications difficult. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the purpose of the present invention is to provide a microwave liquid nitrogen vaporization device, which converts the stored energy of liquid nitrogen into mechanical energy through vaporization, is energy-saving and environmentally friendly, meets the requirements for stored energy use, and can realize the secondary use of liquid nitrogen.

[0005] In order to solve the above problems, the technical solutions adopted by the present invention are as follows:

[0006] Provided is a microwave liquid nitrogen vaporization device, comprising: a housing having a vaporization cavity provided therein, the housing further being provided with a nitrogen output pipe connected to the vaporization cavity; a feed assembly comprising a plurality of feed pipes, each of the feed pipes being connected to the top of the housing and connected to the vaporization cavity; a microwave generating assembly comprising at least two or more microwave generators disposed on opposite sides of the housing and configured to emit microwaves into the vaporization cavity; and an absorbing assembly comprising a plurality of graphene absorbing members disposed within the vaporization cavity, each of the graphene absorbing members being disposed below a connection between a corresponding feed pipe and the housing and absorbing microwave energy emitted by the microwave generating assembly.

[0007] Compared with the existing technology, the liquid nitrogen power converter has at least the following beneficial effects: after the liquid nitrogen enters the vaporization chamber from each feed pipe, it slowly flows on each graphene absorbing member. After receiving the microwave energy from the microwave generator, the graphene absorbing member uniformly heats the liquid nitrogen on its surface and rapidly vaporizes the liquid nitrogen. Finally, the liquid nitrogen is output through the nitrogen output pipe. The overall structural design is ingenious, meeting the vaporization requirements of liquid nitrogen. The use of microwaves for contactless heat transfer can effectively avoid damage to the heating device during liquid nitrogen vaporization, and can also prevent nitrogen explosion caused by local overheating of the heating device. The vaporized nitrogen is stably output, realizing the secondary utilization of liquid nitrogen.

[0008] Optionally, the feeding assembly includes a liquid nitrogen input pipe, which is provided with a liquid nitrogen delivery pump and a vacuum pumping device, and each of the feeding pipes is connected to the output end of the liquid nitrogen input pipe.

[0009] Optionally, the liquid nitrogen delivery pump is provided with a liquid nitrogen output nozzle for delivering liquid nitrogen to each of the feed pipes.

[0010] Optionally, the liquid nitrogen input pipe is provided with an input pipe insulation device, and the box body is provided with a box body insulation device.

[0011] Optionally, a horn-shaped quartz glass waveguide is provided between the microwave generator and the vaporization cavity, the small end of the quartz glass waveguide is connected to the microwave generator, and the large end is connected to the vaporization cavity, and each of the graphene absorbing components is located in the microwave guiding direction of the quartz glass waveguide.

[0012] Optionally, the graphene absorbing component is composed of a plurality of absorbing balls connected in series.

[0013] Optionally, the graphene absorbing components are staggered with respect to each other in the microwave emission direction of the microwave generator.

[0014] To achieve the above-mentioned object, the present invention further provides a liquid nitrogen power converter, comprising: the microwave liquid nitrogen vaporization device as described above; a pneumatic conversion device, comprising a base, a power output cylinder, and a conversion flywheel, wherein the power output cylinder comprises a cylinder body and a pneumatic piston movably disposed on the cylinder body, the cylinder body is hinged to the base, the conversion flywheel is disposed on the base, the end of the pneumatic piston is eccentrically hinged to the conversion flywheel, and the nitrogen output pipe is connected to the cylinder body.

[0015] Compared with the existing technology, this liquid nitrogen power converter has at least the following beneficial effects: liquid nitrogen is transported from a liquid nitrogen storage tank to the liquid nitrogen power converter, and the liquid nitrogen power converter uses microwave heating to uniformly vaporize the liquid nitrogen. The vaporized nitrogen drives the power output cylinder, converting the gas state change into mechanical energy output. The output is stable and can drive the conversion flywheel for power output. It can be used in the automotive field or the power generation field and has good application prospects.

[0016] In addition, the present invention also provides a power generation system, comprising: the liquid nitrogen power converter as described above; a generator, the conversion flywheel being connected to the generator; a liquid nitrogen storage tank for providing liquid nitrogen to the liquid nitrogen power converter; a nitrogen recovery device being connected to the power output cylinder; and a nitrogen compressor, the air inlet end of which is connected to the nitrogen recovery device, and the liquid outlet end of which is connected to the liquid nitrogen storage tank.

[0017] Compared with the existing technology, this power generation system has at least the following beneficial effects: after the liquid nitrogen power converter converts liquid nitrogen into power output, the mechanical energy of the conversion flywheel is converted into electrical energy through the generator to serve as an energy storage power supply, which can realize emergency and smart grid power supply, reduce the impact of power outages on industrial and agricultural production or daily life, and the liquid nitrogen storage tank is easy to extract, which can solve the problem of electricity shortage and meet the energy storage needs of the power plant.

[0018] Optionally, a liquid nitrogen evaporation transducer for recovering waste heat from the nitrogen compressor is further included, and a re-evaporation device is provided at the bottom of the vaporization chamber. The re-evaporation device is connected to the liquid nitrogen evaporation transducer and is used to release the recovered heat from the liquid nitrogen evaporation transducer.

[0019] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, 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 only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 A schematic diagram of the external structure of a liquid nitrogen power converter provided in an embodiment of the present invention;

[0022] Figure 2 for Figure 1 The structural diagram of the liquid nitrogen input pipe provided in;

[0023] Figure 3 A schematic diagram of the internal structure of a liquid nitrogen power converter provided in one embodiment of the present invention;

[0024] Figure 4 A schematic diagram of the internal structure of a liquid nitrogen power converter provided by another embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the internal structure of a liquid nitrogen power converter provided in yet another embodiment of the present invention;

[0026] Figure 6 Schematic diagram of the distribution structure of the graphene absorbing component of the present invention on the box;

[0027] Figure 7 A schematic structural diagram of a pneumatic conversion device provided in an embodiment of the present invention;

[0028] Figure 8 A schematic structural diagram of a liquid nitrogen storage tank provided in an embodiment of the present invention;

[0029] Figure 9 A schematic structural diagram of a power generation system provided in an embodiment of the present invention.

[0030] Description of Figure Numbers:

[0031] 100 microwave liquid nitrogen vaporization device, 110 housing, 111 vaporization chamber, 112 housing insulation device, 120 feed assembly, 121 feed pipe, 122 liquid nitrogen input pipe, 130 microwave generator, 131 quartz glass waveguide, 140 graphene absorbing component, 141 absorbing ball, 150 nitrogen output pipe, 151 air pressure regulating valve, 160 liquid nitrogen delivery pump, 161 liquid nitrogen output nozzle, 170 vacuum pump, 180 input pipe insulation device;

[0032] 200 pneumatic conversion device, 210 base, 220 power output cylinder, 221 pneumatic piston, 230 conversion flywheel;

[0033] 300 liquid nitrogen storage tanks;

[0034] 400 generators;

[0035] 500 re-evaporation device. DETAILED DESCRIPTION

[0036] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0037] It should be noted that when an element is referred to as being “fixed on” or “disposed on” another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or indirectly connected to the other element.

[0038] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0039] The microwave liquid nitrogen vaporization device provided in the first embodiment of the present invention will now be described with reference to the accompanying drawings.

[0040] See also Figures 1 to 6A microwave liquid nitrogen vaporization device includes a housing 110, a feed assembly 120, a microwave generating assembly, and a microwave absorbing assembly. A vaporization chamber 111 is provided within the housing 110, serving as the vaporization chamber for the liquid nitrogen. A nitrogen output pipe 150 is also provided on the housing 110, communicating with the vaporization chamber 111 for outputting the vaporized nitrogen. The feed assembly 120, used to provide liquid nitrogen, includes several feed pipes 121, each connected to the top of the housing 110 and communicating with the vaporization chamber 111, allowing the liquid nitrogen to flow from the top of the housing 110 into the vaporization chamber 111 from top to bottom. The microwave generating assembly cooperates with the absorbing assembly. The microwave generating assembly includes at least two or more microwave generators 130. The microwave generators 130 are arranged on opposite sides of the housing 110 so that the microwave generators 130 can emit microwaves from both sides of the housing 110 into the vaporization cavity 111 to ensure uniform microwave heating. The absorbing assembly includes a plurality of graphene absorbing members 140. The graphene absorbing members 140 are all arranged in the vaporization cavity 111 to absorb the microwave energy emitted by the microwave generators 130. Each graphene absorbing member 140 is arranged below the connection between the corresponding feed pipe 121 and the housing 110, that is, each graphene absorbing member 140 corresponds to each feed pipe 121. After the liquid nitrogen enters the feed pipe 121, it immediately flows into the corresponding graphene absorbing member 140 and is converted into surface heat. After the liquid nitrogen flows into the vaporization cavity 111 from the feed pipe 121, it is heated by the graphene absorbing member 140. The graphene absorbing members 140 transfer the absorbed heat to the liquid nitrogen, vaporizing it. The vaporized liquid nitrogen expands toward and is discharged through the nitrogen output pipe 150. Each graphene absorbing member 140 is located tangentially to the microwaves emitted by the microwave generators 130 on either side of the housing 110. This ensures that the microwaves fully cover the graphene absorbing members 140 within the vaporization cavity 111, uniformly heating them and rapidly vaporizing the liquid nitrogen.

[0041] The microwave liquid nitrogen vaporization device operates as follows: liquid nitrogen enters the vaporization chamber 111 of the housing 110 through the feed pipe 121 and flows on the surface of the graphene absorbing member 140. The microwave generator 130 emits microwaves to the graphene absorbing member 140. The graphene absorbing member 140 absorbs the microwaves and converts them into heat, heating the liquid nitrogen on the surface. The heated liquid nitrogen rapidly vaporizes and expands, and the resulting nitrogen gas flow is output through the nitrogen output pipe 150.

[0042] Compared with the prior art, the liquid nitrogen in the present invention enters the vaporization chamber 111 from each feed pipe 121 and slowly flows on each graphene absorbing member 140. After receiving the microwave energy from the microwave generator 130, the graphene absorbing member 140 uniformly heats the liquid nitrogen on its surface and rapidly vaporizes the liquid nitrogen. The liquid nitrogen is finally output through the nitrogen output pipe 150. The overall structural design is ingenious, meeting the vaporization requirements of liquid nitrogen. The use of microwaves for contactless heat transfer can effectively avoid damage to the heating device during liquid nitrogen vaporization and prevent nitrogen explosion caused by local overheating of the heating device. The vaporized nitrogen is stably output, realizing secondary utilization of the liquid nitrogen.

[0043] In one embodiment of the present invention, the feed assembly 120 includes a liquid nitrogen input pipe 122, which serves as the input header for each feed pipe 121. Each feed pipe 121 is connected to the output end of the liquid nitrogen input pipe 122. After the liquid nitrogen is input from the liquid nitrogen input pipe 122, it is evenly distributed to each feed pipe 121 and then distributed into the vaporization chamber 111. A liquid nitrogen delivery pump 160 and a vacuum pump 170 are provided on the liquid nitrogen input pipe 122. The liquid nitrogen delivery pump 160 is used to evenly deliver the liquid nitrogen to each feed pipe 121. The vacuum pump 170 is used to create a vacuum environment inside the liquid nitrogen input pipe 122, which helps protect the liquid nitrogen and provides good insulation, thereby protecting the liquid nitrogen input pipe 122.

[0044] Furthermore, the liquid nitrogen delivery pump 160 is provided with a liquid nitrogen output nozzle 161, which uniformly sprays the liquid nitrogen into each feed pipe 121. The liquid nitrogen output nozzle 161 is provided with an anti-freeze mechanism, which is used to protect the liquid nitrogen output nozzle 161. Due to the low temperature of liquid nitrogen, the liquid nitrogen output nozzle 161 is likely to freeze due to the low temperature of the liquid nitrogen during the spraying process. The anti-freeze mechanism appropriately heats the liquid nitrogen output nozzle 161 to maintain the liquid nitrogen output nozzle 161 at an appropriate temperature, ensuring the use of the liquid nitrogen output nozzle 161. Among them, the liquid nitrogen output nozzle 161 can be provided with a temperature sensor, which is used to measure the temperature of the liquid nitrogen output nozzle 161 and set a reasonable warning line. When the temperature of the liquid nitrogen output nozzle 161 is too low, the anti-freeze mechanism starts to work, preventing the liquid nitrogen output nozzle 161 from falling below the warning line. A main controller may be provided on the microwave liquid nitrogen vaporization device. The main controller is electrically connected to the liquid nitrogen output nozzle 161, the temperature sensor, and the anti-freezing mechanism. After the temperature sensor senses the temperature information of the liquid nitrogen output nozzle 161, it sends a signal to the main controller. After the main controller makes a judgment, it sends the information to the anti-freezing mechanism to increase the temperature of the liquid nitrogen output nozzle 161.

[0045] In this embodiment, when the temperature sensed by the temperature sensor falls below a warning value, the main controller first stops the liquid nitrogen output nozzle 161 from spraying liquid. After the anti-freeze mechanism heats the liquid nitrogen output nozzle 161 to an appropriate temperature, the main controller resumes the liquid nitrogen output nozzle 161 from spraying liquid. The warning value may be -190°C, but may also be other values ​​appropriate to the liquid nitrogen temperature.

[0046] Specifically, the antifreeze device includes a heating ring that surrounds the liquid nitrogen output nozzle 161 and evenly heats the liquid nitrogen output nozzle 161 to prevent uneven heating of the liquid nitrogen output nozzle 161. The heating ring is located outside the liquid nitrogen output nozzle 161 to prevent contact with the liquid nitrogen inside the liquid nitrogen output nozzle 161. Furthermore, the heating ring can heat the liquid nitrogen output nozzle 161 while it is in operation, ensuring that the liquid nitrogen output nozzle 161 is always at a suitable operating temperature.

[0047] Furthermore, the liquid nitrogen input pipe 122 is provided with an input pipe insulation device 180. This device is used to prevent the temperature of the liquid nitrogen input pipe 122 from being too low. When the temperature of the liquid nitrogen input pipe 122 falls below a warning value, the liquid nitrogen input pipe 122 is appropriately heated to maintain a suitable temperature. Furthermore, the housing 110 is provided with a housing insulation device 112. This device is used to maintain the temperature of the housing 110, preventing it from being too low and maintaining its pressure resistance.

[0048] The input pipe insulation device 180 and the box body insulation device 112 can both be heating pipes or other heating devices to maintain the temperature of the liquid nitrogen input pipe 122 and the box body 110, and are controlled by temperature sensors.

[0049] Furthermore, an intracavity temperature sensor can be set in the vaporization chamber 111. The intracavity temperature sensor is electrically connected to the main controller to monitor the temperature changes in the vaporization chamber 111. When the temperature in the vaporization chamber 111 is abnormal, the main controller can alarm or perform emergency shutdown.

[0050] Preferably, a bell mouth is provided at the connection between vaporization chamber 111 and nitrogen output pipe 150. The large end of the bell mouth is connected to vaporization chamber 111, and the small end is connected to the gas output end. Nitrogen converted from vaporization chamber 111 can flow through the bell mouth to the gas output end. According to the principles of fluid mechanics, as the airflow gradually narrows from the large end to the small end, the flow rate increases, which can increase the flow rate of gas in nitrogen output pipe 150 and ensure the output power of nitrogen. Furthermore, the bell mouth can accept more nitrogen gas, converting it into stable power output.

[0051] Furthermore, a quartz glass waveguide 131 is disposed between the microwave generator 130 and the vaporization chamber 111. This quartz glass waveguide 131 is horn-shaped, with its small end connected to the microwave generator 130 and its large end connected to the sidewall of the vaporization chamber 111. Microwaves emitted by the microwave generator 130 are guided through the quartz glass waveguide 131, expanding and contracting throughout the vaporization chamber 111. They are then fully absorbed by the graphene absorbing member 140 within the vaporization chamber 111, thereby enhancing the graphene absorbing member 140's absorption efficiency. In this embodiment, the microwave generating assembly includes two microwave generators 130. The two quartz glass waveguides 131 connected to the two microwave generators 130 are positioned opposite each other on either side of the vaporization chamber 111, directing the microwaves into the interior of the vaporization chamber 111.

[0052] In another embodiment of the present invention, see Figure 3 The graphene absorbing member 140 is composed of a plurality of absorbing balls 141 connected in series. The absorbing balls 141 are spherical structures made of graphene material, and their surfaces are graphene spherical surfaces. Adjacent absorbing balls 141 are connected by connecting columns. Liquid nitrogen slowly flows downward from the top absorbing ball 141 to the bottom. When it flows to the absorbing ball 141 below, the spherical structure on the absorbing ball 141 can not only increase the contact surface of the liquid nitrogen on the absorbing ball 141, but also slow down the flow speed of the liquid nitrogen on the graphene absorbing member 140, so that the microwave energy absorbed by the graphene absorbing member 140 is fully transferred to the liquid nitrogen, thereby improving the vaporization rate of the liquid nitrogen.

[0053] Further reading Figure 4 , part of the graphene absorbing member 140 can also be made of spherical cylinders connected in series, which also has sufficient evaporation capacity for liquid nitrogen and a large contact area with the evaporation of liquid nitrogen; continue to refer to Figure 5 5 are all composed of spherical cylinders connected in series, which is also within the scope of the embodiment of the present invention. In addition, the graphene absorbing components 140 can also be components of other shapes, which can also achieve the evaporation effect of liquid nitrogen.

[0054] In another embodiment, the interior of graphene absorbing member 140 can be made of a compression-resistant and anti-violence material, such as a metal or alloy, while its surface can be completely covered with a graphene layer to absorb microwaves, thereby achieving the technical effects of the present invention. Graphene absorbing member 140 can be fixedly suspended from the bottom of feed pipe 121 via a fixed net or column provided at the connection between feed pipe 121 and housing 110.

[0055] Preferably, the graphene absorbing members 140 are staggered in the microwave emission direction of the microwave generator 130. When the microwaves are emitted through the quartz glass waveguide 131 and then emitted toward the opposite side, the staggered graphene absorbing members 140 are distributed in the cross-sectional direction of each microwave emission, fully absorbing the microwaves and improving the energy conversion efficiency. Figure 6 When the left microwave generator 130 emits microwaves toward the center of the vaporization cavity 111, a portion of the emitted microwaves is absorbed by the front row of graphene absorbing members 140, while the remaining microwaves pass through the front row of graphene absorbing members 140 and are absorbed by the middle row of graphene absorbing members 140. When the right microwave generator 130 emits microwaves toward the center of the cavity, a portion of the emitted microwaves is absorbed by the rear row of graphene absorbing members 140, while the remaining microwaves pass through the rear row of graphene absorbing members 140 and are absorbed by the middle row of graphene absorbing members 140. This staggered arrangement increases the microwave coverage of the absorbing components, enhances microwave absorption efficiency, and fully transfers the microwave energy to the liquid nitrogen, vaporizing it.

[0056] See Figure 7 and Figure 8 , the liquid nitrogen power converter according to the second embodiment of the present invention is described below.

[0057] A liquid nitrogen power converter includes a pneumatic conversion device 200 and a microwave liquid nitrogen vaporization device 100 according to a first embodiment of the present invention. The pneumatic conversion device 200 includes a base 210, a power output cylinder 220, and a conversion flywheel 230. The power output cylinder 220 includes a cylinder body and a pneumatic piston 221 movably disposed on the cylinder body. The cylinder body is hinged to the base 210. The conversion flywheel 230 is rotatably disposed on the base 210. The end of the pneumatic piston 221 is eccentrically hinged to the conversion flywheel 230. A nitrogen output pipe 150 is connected to the cylinder body. After nitrogen is output from the nitrogen output pipe 150 of the microwave liquid nitrogen vaporization device 100, it enters the power output cylinder 220, driving the power output cylinder 220 to perform reciprocating piston motion between the base 210 and the conversion flywheel 230, converting the output power of the nitrogen output pipe 150 into the rotational motion of the conversion flywheel 230, thereby achieving a mechanical energy conversion process.

[0058] In another embodiment of the present invention, a pressure regulating valve 151 is provided on the nitrogen output pipe 150. The pressure regulating valve 151 is used to control the output pressure of the nitrogen output pipe 150 to stabilize the output gas flow, prevent the rapid expansion of liquid nitrogen in the vaporization chamber 111 from causing unstable output gas pressure, protect the power output cylinder 220 in a stable gas output state, and ensure smooth rotation of the conversion flywheel 230.

[0059] The power generation system according to the third embodiment of the present invention is described below.

[0060] See Figures 1 to 9 A power generation system includes a liquid nitrogen storage tank 300, a nitrogen recovery device, a generator 400, a nitrogen compressor, and a liquid nitrogen power converter according to the second embodiment of the present invention. The liquid nitrogen storage tank 300 is used to provide liquid nitrogen for the liquid nitrogen power converter. The liquid nitrogen input pipe 122 is connected to the liquid nitrogen storage tank 300. The nitrogen recovery device is connected to the power output cylinder 220. The output nitrogen is output as power through the power output cylinder 220 and then enters the nitrogen recovery device for recovery. The generator 400 is connected to the conversion flywheel 230 of the liquid nitrogen power converter. The power output cylinder 220 converts the power of the nitrogen into kinetic energy of the conversion flywheel 230, which is then converted into electrical energy through the generator 400, thereby realizing the power generation process.

[0061] The nitrogen compressor's air inlet is connected to a nitrogen recovery unit, and its liquid outlet is connected to a liquid nitrogen storage tank 300. After entering the nitrogen recovery unit, the nitrogen enters the nitrogen compressor and is recompressed into liquid nitrogen. The compressed liquid nitrogen is then recovered into the liquid nitrogen storage tank 300 through the liquid outlet, enabling nitrogen recycling. After the nitrogen is recovered and collected in the nitrogen recovery unit, the nitrogen in the nitrogen recovery unit can be transported to the nitrogen compressor through the air inlet. When liquid nitrogen needs to be remanufactured, the nitrogen in the nitrogen recovery unit can be used as raw material for liquid nitrogen production. The nitrogen recovery unit can also be a nitrogen recovery tank, which collects nitrogen after operation.

[0062] Compared with the existing technology, the liquid nitrogen power converter converts liquid nitrogen into power output, and then converts the mechanical energy of the flywheel 230 into electrical energy through the generator 400 to serve as an energy storage power source. This can realize emergency and smart grid power supply, reducing the impact of power outages on industrial and agricultural production or daily life. The liquid nitrogen storage tank 300 is easy to extract, which can solve the problem of power shortage and meet the energy storage needs of the power plant.

[0063] As a further improvement of the above solution, the power generation system also includes a liquid nitrogen evaporation transducer, which is connected to the nitrogen compressor and is used to recover the waste heat generated by the nitrogen compressor. A re-evaporation device 500 is provided at the bottom of the vaporization chamber 111. The re-evaporation device 500 is connected to the liquid nitrogen evaporation transducer and is used to release the heat recovered by the liquid nitrogen evaporation transducer into the vaporization chamber 111, thereby completely vaporizing the incompletely vaporized liquid nitrogen therein.

[0064] Specifically, during the compression process, the nitrogen compressor generates heat, which is recovered by the liquid nitrogen evaporation transducer and released through the re-evaporation device 500. In this embodiment, the liquid nitrogen evaporation transducer is a heat transfer device that can be composed of a heat-conducting pipe and a heat-conducting medium. The heat-conducting medium is transported within the heat-conducting pipe, which is arranged around the nitrogen compressor and recovers the heat released by the nitrogen compressor through contact. The heat-conducting medium absorbs the heat and then transports it to the re-evaporation device 500. The re-evaporation device 500 vaporizes the unvaporized liquid nitrogen at the bottom of the vaporization chamber 111 to achieve further vaporization of the liquid nitrogen, prevent the accumulation of unvaporized liquid nitrogen in the vaporization chamber 111, and may also achieve energy recovery and reuse.

[0065] It should be noted that, since some unvaporized liquid nitrogen may drip to the bottom of the vaporization chamber 111 when the liquid nitrogen passes through the graphene absorbing member 140, a re-evaporation device 500 is provided. The re-evaporation device 500 can be a heating ring surrounded by a heat pipe or a heat conducting plate, and can also achieve the re-evaporation process of the remaining liquid nitrogen.

[0066] The above embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and replacements made by technicians in this field on the basis of the present invention fall within the scope of protection required by the present invention.

Claims

1. A microwave liquid nitrogen vaporization device, characterized in that: include: A box body, wherein a vaporization chamber is provided inside the box body, and a nitrogen output pipe connected to the vaporization chamber is also provided on the box body; A feed assembly, comprising a plurality of feed pipes, each of which is connected to the top of the box and communicates with the vaporization chamber; A microwave generating assembly, comprising at least two or more microwave generators disposed on opposite sides of the housing, for emitting microwaves into the vaporization cavity; an absorbing assembly comprising a plurality of graphene absorbing members disposed in the vaporization chamber, each of the graphene absorbing members being disposed below a corresponding connection port between the feed pipe and the box body and absorbing microwave energy emitted by the microwave generating assembly; The feed assembly includes a liquid nitrogen input pipe, which is provided with a liquid nitrogen delivery pump and a vacuum pumping device. Each of the feed pipes is connected to the output end of the liquid nitrogen input pipe. A trumpet-shaped quartz glass waveguide is provided between the microwave generator and the vaporization cavity. The small end of the quartz glass waveguide is connected to the microwave generator, and the large end is connected to the vaporization cavity. Each of the graphene absorbing components is located in the microwave guiding direction of the quartz glass waveguide. The graphene absorbing components are staggered with respect to the microwave emission direction of the microwave generator.

2. The microwave liquid nitrogen vaporization device according to claim 1, characterized in that: The liquid nitrogen delivery pump is provided with a liquid nitrogen output nozzle for delivering liquid nitrogen to each of the feed pipes.

3. The microwave liquid nitrogen vaporization device according to claim 2, characterized in that: The liquid nitrogen input pipe is provided with an input pipe heat preservation device, and the box body is provided with a box body heat preservation device.

4. The microwave liquid nitrogen vaporization device according to claim 1, characterized in that: The graphene wave-absorbing component is composed of a plurality of wave-absorbing balls connected in series.

5. A liquid nitrogen power converter, characterized in that: include: The microwave liquid nitrogen vaporization device according to any one of claims 1 to 4; A pneumatic conversion device includes a base, a power output cylinder, and a conversion flywheel. The power output cylinder includes a cylinder body and a pneumatic piston movably arranged on the cylinder body. The cylinder body is hinged to the base. The conversion flywheel is rotatably arranged on the base. The end of the pneumatic piston is eccentrically hinged to the conversion flywheel. The nitrogen output pipe is connected to the cylinder body.

6. A power generation system, characterized in that: include: The liquid nitrogen power converter according to claim 5; a generator, the conversion flywheel being connected to the generator; a liquid nitrogen storage tank, used to provide liquid nitrogen to the liquid nitrogen power converter; a nitrogen recovery device connected to the power output cylinder; A nitrogen compressor, wherein the air inlet end is connected to the nitrogen recovery device, and the liquid outlet end is connected to the liquid nitrogen storage tank.

7. The power generation system according to claim 6, characterized in that: It also includes a liquid nitrogen evaporation transducer for recovering waste heat from the nitrogen compressor. A re-evaporation device is provided at the bottom of the vaporization chamber. The re-evaporation device is connected to the liquid nitrogen evaporation transducer and is used to release the recovered heat from the liquid nitrogen evaporation transducer.

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