Liquid nitrogen vaporization cold energy utilization device

Abstract

The utility model relates to a liquid nitrogen vaporization cold energy utilization device which comprises a liquid nitrogen vaporizer, a water tank, a first drainage piece and a second drainage piece. The liquid nitrogen vaporizer is installed in the water tank, the first drainage piece is arranged above the liquid nitrogen vaporizer and used for leading in water flow and spraying the water flow to the liquid nitrogen vaporizer, and the second drainage piece is used for leading out water flow at the bottom of the water tank. The liquid nitrogen vaporizer is installed in the water tank, water flow is introduced through the first drainage piece and sprayed to the liquid nitrogen vaporizer, and liquid nitrogen in the liquid nitrogen vaporizer exchanges heat with the water flow flowing on the surface of the liquid nitrogen vaporizer to be vaporized. Flowing water flow takes away cold energy on the surface of the liquid nitrogen vaporizer in time so as to effectively restrain the surface of the liquid nitrogen vaporizer from being supercooled and frozen, the liquid nitrogen vaporization effect is guaranteed, cold water is obtained through heat exchange, the cold water is collected through the water tank, the cold water is led out through the second drainage piece to be used in other processes of lithium battery production, and the production efficiency is improved. And the liquid nitrogen vaporization cooling capacity is effectively utilized.

Description

Technical Field

[0001] The utility model relates to the technical field of energy recovery and utilization, in particular to a liquid nitrogen vaporization cold energy utilization device. Background Art

[0002] A large amount of nitrogen is required in the production process of lithium batteries. The supply of nitrogen is currently usually obtained by vaporizing liquid nitrogen using a liquid nitrogen vaporizer. The liquid nitrogen vaporizer is directly exposed to the air, resulting in a large amount of cold energy being directly discharged into the air without being recycled, causing energy waste. In addition, the air around the liquid nitrogen vaporizer is easily condensed and frozen, resulting in a decrease in the heat exchange effect of the liquid nitrogen vaporizer, which seriously affects the liquid nitrogen vaporization effect. Utility Model Content

[0003] Based on this, it is necessary to address the technical problem that a large amount of cold energy generated by liquid nitrogen vaporization is not utilized, resulting in energy waste. The utility model provides a liquid nitrogen vaporization cold energy utilization device.

[0004] The utility model provides a liquid nitrogen vaporization cold energy utilization device, which comprises a liquid nitrogen vaporizer, a water tank, a first guide piece and a second guide piece; the liquid nitrogen vaporizer is installed in the water tank, the first guide piece is arranged above the liquid nitrogen vaporizer, the first guide piece is used to introduce water flow and spray the water flow to the liquid nitrogen vaporizer, and the second guide piece is used to guide the water flow at the bottom of the water tank out.

[0005] The utility model installs a liquid nitrogen vaporizer in a water tank, introduces a water flow through a drainage piece 1 and sprays the water flow toward the liquid nitrogen vaporizer, the liquid nitrogen in the liquid nitrogen vaporizer exchanges heat with the water flow flowing on the surface of the liquid nitrogen vaporizer and vaporizes, the flowing water flow promptly takes away the coldness of the surface of the liquid nitrogen vaporizer and effectively inhibits the overcooling and icing of the surface of the liquid nitrogen vaporizer, not only ensures the vaporization effect of the liquid nitrogen, but also obtains cold water through heat exchange, collects the cold water through the water tank and uses the drainage piece 2 to lead the cold water out for use in other processes of lithium battery production, for example, the obtained cold water can be used as water replenishment for an air compressor cooling tower, and can also be used as circulating cooling water, effectively utilizing the coldness of liquid nitrogen vaporization and reducing energy waste.

[0006] As a further improvement of the above scheme of the utility model, the drainage component 1 includes a water distribution pipe and a drainage pipe 1. Multiple water distribution pipes are fixed on the top of the water tank to form a ring-shaped pipe network. Multiple sprinkler nozzles are arranged on each water distribution pipe, and one end of one water distribution pipe extends out of the water tank and is connected to the drainage pipe 1 through a water pipe quick connector. Multiple water distribution pipes form a ring-shaped pipe network, which can make the water flow more uniform in the pipeline without dead water areas, and can increase the spraying area, ensuring that there is water flow on all surfaces of the liquid nitrogen vaporizer, thereby improving the heat exchange effect, making full use of the liquid nitrogen vaporization cooling capacity, and effectively inhibiting the surface of the liquid nitrogen vaporizer from being overcooled and frozen. The water distribution pipe and the drainage pipe 1 are connected by a water pipe quick connector, which is convenient for maintenance and disassembly.

[0007] As a further improvement of the above solution of the utility model, the drainage member 1 further includes a water inlet pipe 1 and a water inlet pipe 2, both of which are connected to the drainage pipe 1 and are respectively provided with a valve 1 and a valve 2. By providing the water inlet pipe 1 and the water inlet pipe 2, different water sources can be used as the water source of the drainage member 1.

[0008] As a further improvement of the above solution of the utility model, the drainage member 2 includes a water pump, a drainage pipe 2 and a drainage pipe 3, one end of the drainage pipe 2 is connected to the bottom of the water tank and the other end is connected to the inlet of the water pump, and one end of the drainage pipe 3 is connected to the outlet of the water pump. The water flow cooled by heat exchange in the water tank is led out by the water pump through power for use in other processes of lithium battery production.

[0009] As a further improvement of the above scheme of the utility model, the drainage member 2 also includes a water outlet pipe 1 and a water outlet pipe 2, both of which are connected to the other end of the drainage pipe 3, and the water outlet pipe 1 and the water outlet pipe 2 are respectively provided with valves 3 and 4, and the water outlet pipe 1 is also provided with a backflow preventer. By providing the water outlet pipe 1 and the water outlet pipe 2, the water flow in the water tank that is cooled due to heat exchange can be introduced into different equipment for use in other processes of lithium battery production; the backflow preventer can prevent water from flowing back to the water tank.

[0010] As a further improvement of the above solution of the utility model, the water tank is provided with an electromagnetic level gauge and a temperature sensor. The electromagnetic level gauge and the temperature sensor monitor the liquid level and the water temperature in the water tank in real time, and adjust the frequency of the water pump and the opening of valves 1, 2, 3 and 4 according to the liquid level and the water temperature in the water tank.

[0011] As a further improvement of the above scheme of the utility model, the water tank includes a water collecting tank and a plurality of protective plates fixed on the top of the water collecting tank, the bottom of the liquid nitrogen vaporizer is fixed in the water collecting tank by a plurality of brackets and the liquid nitrogen inlet pipe of the liquid nitrogen vaporizer is located below the liquid level in the water tank, and a plurality of protective plates are circumferentially arranged around the liquid nitrogen vaporizer and the plurality of protective plates are connected end to end in sequence. The water collecting tank is mainly used to collect cold water and provide the minimum effective water level for the water pump. The protective plates are used to keep the device warm and prevent water from splashing. The liquid nitrogen inlet pipe is arranged below the water surface to prevent the liquid nitrogen inlet pipe from freezing and affecting the vaporization efficiency.

[0012] As a further improvement of the above solution of the utility model, a flow pusher is installed in the water collecting tank. The flow pusher is used to continuously stir the water surface to prevent the water surface from being still and forming supercooled points and ice.

[0013] As a further improvement of the above solution of the utility model, the liquid nitrogen vaporization cold energy utilization device also includes a top cover, which is arranged at the top of the water tank and is detachably connected to the water tank to seal the water tank, and an exhaust port and a hook are arranged on the top cover; the drainage member 1 is installed on the inner side of the top cover. The top cover is used to hang the drainage member 1, and the hook can be used to facilitate the removal of the top cover during maintenance, and the exhaust port is used to maintain the air pressure balance in the water tank.

[0014] As a further improvement of the above solution of the utility model, a mud collecting trough is formed at the bottom of the water tank, the bottom of the water collecting trough is inclined to introduce impurities at the bottom into the mud collecting trough, the bottom of the mud collecting trough is connected to a mud discharge pipe and a valve 5 is arranged on the mud discharge pipe. The bottom of the water collecting trough is inclined, and impurities in the water eventually flow into the mud collecting trough and are regularly cleaned by the mud discharge pipe.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The utility model installs a liquid nitrogen vaporizer in a water tank, introduces a water flow through a drainage piece 1 and sprays the water flow toward the liquid nitrogen vaporizer, the liquid nitrogen in the liquid nitrogen vaporizer exchanges heat with the water flow flowing on the surface of the liquid nitrogen vaporizer and vaporizes, the flowing water flow promptly takes away the cold amount on the surface of the liquid nitrogen vaporizer and effectively inhibits the overcooling and icing of the surface of the liquid nitrogen vaporizer, not only ensures the vaporization effect of the liquid nitrogen, but also obtains cold water through heat exchange, collects the cold water through the water tank and uses the drainage piece 2 to lead the cold water out for use in other lithium battery production processes, for example, the obtained cold water can be used as water replenishment for an air compressor cooling tower, and can also be used as circulating cooling water for a lithium battery process, effectively utilizing the cold amount of liquid nitrogen vaporization and reducing energy waste. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of the structure of a liquid nitrogen vaporization cooling energy utilization device proposed in an embodiment of the utility model;

[0018] Figure 2A schematic diagram of the installation of a liquid nitrogen vaporizer in a liquid nitrogen vaporization cold energy utilization device proposed in an embodiment of the utility model;

[0019] Figure 3 A schematic diagram of the structure of a water distribution pipe in a liquid nitrogen vaporization cooling energy utilization device proposed in an embodiment of the utility model;

[0020] Figure 4 A schematic diagram of the structure of a water collecting tank in a liquid nitrogen vaporization cold energy utilization device proposed in an embodiment of the utility model.

[0021] Figure numerals: 1, liquid nitrogen vaporizer; 2, water distribution pipe; 3, drainage pipe one; 4, sprinkler nozzle; 5, water pipe quick connector; 6, water inlet pipe one; 7, water inlet pipe two; 8, valve one; 9, valve two; 10, water pump; 11, drainage pipe two; 12, drainage pipe three; 13, water outlet pipe one; 14, water outlet pipe two; 15, valve three; 16, valve four; 17, backflow preventer; 18, electromagnetic level gauge; 19, temperature sensor; 20, water collecting tank; 21, protective plate; 22, bracket; 23, liquid nitrogen inlet pipe; 24, flow pusher; 25, top cover; 26, buckle; 27, exhaust port; 28, hook; 29, mud collecting tank; 30, mud discharge and empty pipe; 31, valve five; 32, fixing seat. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] This embodiment aims to solve the technical problem that a large amount of cold energy generated by liquid nitrogen vaporization is not utilized, resulting in energy waste, and provides a liquid nitrogen vaporization cold energy utilization device. Figure 1 The liquid nitrogen vaporization cold energy utilization device of this embodiment includes a liquid nitrogen vaporizer 1, a water tank, a guide member 1 and a guide member 2.

[0024] The water tank is used to provide a closed space. The water tank can directly adopt a box structure known in the prior art that can store water. For ease of use, in this embodiment, the water tank includes a water collection tank 20, four protective plates 21 and a top cover 25. The water collection tank 20 is mainly used to collect water flow and provide the lowest effective water level. The bottom of the water collection tank 20 can be fixed to the ground through a fixing seat 32. In this embodiment, the water collection tank 20 adopts a tank structure with a rectangular cross-section, which has four sides. Of course, in other embodiments, as long as the structural stability and use requirements are met, the water collection tank 20 can also adopt a tank structure with a triangular or circular cross-section. The number of protective plates 21 corresponds to the number of sides of the water collection tank 20. In this embodiment, the number of protective plates 21 is four and the bottoms of the four protective plates 21 are respectively fixed to the tops of the four sides of the water collection tank 20, and the four protective plates 21 are connected end to end in sequence. The protective plates 21 are used to keep the device warm and prevent water splashing. In this embodiment, the protective plates 21 are clean plates.

[0025] Liquid nitrogen vaporizer 1 is arranged in the water tank, combined with Figure 2 The bottom of the liquid nitrogen vaporizer 1 is connected to the bottom plate of the water collecting tank 20 through a plurality of brackets 22. In this embodiment, the liquid nitrogen vaporizer 1 can adopt an air-type vaporizer in the prior art, and its working principle is known and will not be described in detail here.

[0026] The top cover 25 is adapted to the water tank structure and is covered on the top of the water tank. The top cover 25 is detachably connected to the top of the water tank through a plurality of buckles 26, and the water tank is sealed by the top cover 25. To maintain the air pressure balance in the water tank, an exhaust port 27 is provided on the top cover 25. To facilitate the later maintenance of the water tank, a hook 28 is provided on the top of the top cover 25, and the top cover 25 can be easily removed during maintenance through the hook 28.

[0027] The flow guide 1 is arranged above the liquid nitrogen vaporizer 1 and installed on the inner side of the top cover 25. The flow guide 1 is used to introduce water flow and spray the water flow toward the liquid nitrogen vaporizer 1. The flow guide 1 can directly adopt the existing water pipe. In this embodiment, the flow guide 1 includes a water distribution pipe 2, a drainage pipe 1 3, a water inlet pipe 1 6 and a water inlet pipe 2 7. Figure 3, multiple water distribution pipes 2 are fixed on the inner side of the top cover 25 and form a ring-shaped pipe network, and multiple sprinkler nozzles 4 are evenly arranged on each water distribution pipe 2, and one end of one water distribution pipe 2 extends out of the water tank and is connected to the drainage pipe 1 3 through a water pipe quick connector 5. Multiple water distribution pipes 2 form a ring-shaped pipe network, which can make the water flow in the pipeline more uniform, without dead water areas, and can increase the spraying area, ensuring that there is water flow on all surfaces of the liquid nitrogen vaporizer 1, thereby improving the heat exchange effect, making full use of the liquid nitrogen vaporization cooling capacity, and effectively inhibiting the surface of the liquid nitrogen vaporizer 1 from being overcooled and frozen. The water distribution pipe 2 and the drainage pipe 1 3 are connected by a water pipe quick connector 5, which is convenient for maintenance and disassembly. The sprinkler nozzle 4 of this embodiment adopts the existing known sprinkler nozzle 4 that can adjust the water output, such as a cooling tower nozzle. The water inlet pipe 1 6 and the water inlet pipe 2 7 are both connected to the drainage pipe 1 3, and the water inlet pipe 1 6 and the water inlet pipe 2 7 are respectively provided with a valve 1 8 and a valve 2 9. By setting a water inlet pipe 1 6 and a water inlet pipe 2 7, different water sources can be used as the water source of the drainage member 1. In the present embodiment, the end of the water inlet pipe 1 6 away from the drainage pipe 1 3 is connected to the circulating cooling water return pipe in the lithium battery production, and the end of the water inlet pipe 2 7 away from the drainage pipe 3 is connected to the reclaimed water source; when the circulating cooling water with a water temperature of about 25°C in the circulating cooling water return pipe is used as the water source of the drainage member 1, open valve 1 8 and close valve 2 9, and introduce part of the circulating cooling water with a water temperature of about 25°C in the circulating cooling water return pipe into the water distribution pipe 2 through the water inlet pipe 1 , and multiple sprinkler nozzles 4 spray water to the liquid nitrogen vaporizer 1 from the top at the same time, and the liquid nitrogen in the liquid nitrogen vaporizer 1 absorbs heat and vaporizes, and the flowing circulating cooling water takes away the liquid nitrogen vapor in time. The cold amount on the surface of the vaporizer 1 can effectively suppress the supercooling and icing of the surface of the liquid nitrogen vaporizer 1, which not only ensures the vaporization effect of the liquid nitrogen, but also the circulating cooling water is cooled down due to heat exchange and deposited in the water collecting tank 20; when the cold machine of the circulating cooling water system is shut down, the grey water can be used as the water source of the drainage member 1 to maintain the normal operation of the liquid nitrogen vaporizer 1, open the valve 2 9 and close the valve 1 8, introduce the grey water into the water distribution pipe 2 through the water inlet pipe 2 7, and multiple sprinkler heads 4 spray water to the liquid nitrogen vaporizer 1 at the same time, and the liquid nitrogen in the liquid nitrogen vaporizer 1 absorbs heat and vaporizes, and the flowing grey water takes away the cold amount on the surface of the liquid nitrogen vaporizer 1 in time to effectively suppress the supercooling and icing of the surface of the liquid nitrogen vaporizer 1, which not only ensures the vaporization effect of the liquid nitrogen, but also the grey water is cooled down due to heat exchange and deposited in the water collecting tank 20.

[0028] Drainage component 2 is used to guide the water flow at the bottom of the water tank. Drainage component 2 can directly adopt existing water pipe components. In this embodiment, drainage component 2 includes water pump 10, drainage pipe 2 11, drainage pipe 3 12, water outlet pipe 1 13 and water outlet pipe 2 14. One end of drainage pipe 2 11 is connected to the bottom of the water collecting tank 20 and the other end thereof is connected to the inlet of water pump 10, and one end of drainage pipe 3 12 is connected to the outlet of water pump 10. Water outlet pipe 1 13 and water outlet pipe 2 14 are both connected to the other end of drainage pipe 3 12, and valve 3 15 and valve 4 16 are respectively provided on water outlet pipe 1 13 and water outlet pipe 2 14, and backflow preventer 17 is also provided on water outlet pipe 13. By setting the outlet pipe 13 and the outlet pipe 2 14, the water flow cooled by heat exchange in the water tank can be introduced into different equipment. In this embodiment, the end of the outlet pipe 13 away from the water pump 10 is connected to the circulating cooling water return pipe, and the connection point between the outlet pipe 13 and the circulating cooling water return pipe is located downstream of the connection point between the inlet pipe 16 and the circulating cooling water return pipe. The end of the outlet pipe 2 14 away from the water pump 10 is connected to the air compressor cooling tower or other water-using equipment; when the circulating cooling water is used as the water source of the drainage member 1, the water pump 10 is started, the valve 3 15 is opened, and the valve 4 16 is closed, and the cooled circulating cooling water is returned to the circulating cooling water return pipe through the water pump 10 and the outlet pipe 13. The water pipe is mixed with the original circulating cooling water in the circulating cooling water return pipe, so that the liquid nitrogen vaporization cooling capacity is used to reduce the water temperature at the return end of the circulating cooling water system, thereby reducing the energy consumption of the circulating cooling water system. During the whole process, the backflow preventer 17 can prevent the water from flowing back to the water tank due to excessive water pressure in the circulating cooling water return pipe; when the grey water is used as the water source of the drainage member 1, the water pump 10 is started and the valve four 16 is opened and the valve three 15 is closed, and the cooled grey water is introduced into the air compressor cooling tower or other water-using equipment through the water pump 10 and the outlet pipe two 14 to replenish water for the air compressor cooling tower or other water-using equipment, and the liquid nitrogen vaporization cooling capacity is used to reduce the grey water temperature and provide the required cold water for other equipment.

[0029] In this embodiment, two flow pushers 24 are installed in the water collecting tank 20. The two flow pushers 24 rotate in opposite directions. When the flow pushers 24 rotate, the water flow in the water collecting tank 20 can be continuously stirred. The water flow in the water collecting tank 20 is continuously stirred by the flow pushers 24 to prevent the water surface from being still and forming supercooled points to freeze. Of course, in other embodiments, as long as the use requirements are met, the flow pushers 24 can also be 1, 3, or other quantities.

[0030] Furthermore, an electromagnetic level gauge 18 and a temperature sensor 19 are also installed on the protective plate 21. The electromagnetic level gauge 18 can monitor the liquid level in the water tank in real time. When the liquid level in the water tank reaches a predetermined level, the water pump 10 is started, and the frequency of the water pump 10 is adjusted in real time according to the liquid level in the water tank to ensure that the liquid level in the water tank remains within the predetermined liquid level range. The predetermined liquid level in the water tank should ensure that the liquid nitrogen inlet pipe 23 of the liquid nitrogen vaporizer 1 can be located below the liquid surface to prevent the liquid nitrogen inlet pipe 23 from freezing and affecting the vaporization efficiency. The temperature sensor 19 can monitor the water temperature in the water tank in real time. According to the water temperature in the water tank, the opening of valve 1 8, valve 2 9, valve 3 15, and valve 4 16 are adjusted to maintain the water temperature in the water tank within the predetermined temperature range to ensure the vaporization efficiency of liquid nitrogen.

[0031] In this embodiment, combined with Figure 4 A mud collecting trough 29 is integrally formed at the bottom of the water collecting trough 20. The bottom plate of the water collecting trough 20 is tilted to introduce impurities at the bottom into the mud collecting trough 29. A mud drain pipe 30 is connected to the bottom of the mud collecting trough 29. A valve 5 31 is provided on the mud drain pipe 30. During use, impurities in the water flow will be introduced into the mud collecting trough 29 and deposited in the mud collecting trough 29. The mud drain pipe 30 can be opened regularly to regularly clean the sludge at the bottom of the water tank. In addition, when the liquid nitrogen vaporizer 1 needs to be cleaned and maintained, the valve 2 9 and the valve 5 31 can be opened, the valve 1 8 and the water pump 10 can be closed, and the reclaimed water can be used as the water source of the drainage component 1 to flush the liquid nitrogen vaporizer 1 and the inside of the water tank, and the sewage can be discharged through the mud drain pipe 30.

[0032] It should be noted that valve one 8, valve two 9, valve three 15, valve four 16, and valve five 31 of this embodiment all adopt existing known electric flow regulating valves for water pipes, and their working principles are known and will not be elaborated here.

[0033] It should be noted that when a component is referred to as being "mounted on" another component, it may be directly on the other component or there may be a central component. When a component is considered to be "set on" another component, it may be directly set on the other component or there may be a central component at the same time. When a component is considered to be "fixed to" another component, it may be directly fixed on the other component or there may be a central component at the same time.

[0034] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art in the technical field of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. The term "or / and" used herein includes any and all combinations of one or more related listed items.

[0035] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0036] The above-mentioned embodiments only express several implementation methods of the utility model, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the utility model patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the utility model, which all belong to the protection scope of the utility model. Therefore, the protection scope of the utility model patent shall be based on the attached claims.

Claims

1. A liquid nitrogen vaporization cold energy utilization device, comprising a liquid nitrogen vaporizer (1), characterized in that: It also comprises a water tank, a first guide piece and a second guide piece; the liquid nitrogen vaporizer (1) is installed in the water tank, the first guide piece is arranged above the liquid nitrogen vaporizer (1), the first guide piece is used to introduce water flow and spray the water flow toward the liquid nitrogen vaporizer (1), and the second guide piece is used to guide the water flow at the bottom of the water tank out.

2. The liquid nitrogen vaporization cold energy utilization device according to claim 1, characterized in that: The drainage member 1 comprises a plurality of water distribution pipes (2) and a drainage pipe 1 (3). The plurality of water distribution pipes (2) are fixed on the top of the water tank to form a ring-shaped pipe network. A plurality of sprinkler heads (4) are arranged on each water distribution pipe (2). One end of one of the water distribution pipes (2) extends out of the water tank and is connected to the drainage pipe 1 (3) via a water pipe quick connector (5).

3. The liquid nitrogen vaporization cold energy utilization device according to claim 2, characterized in that: The drainage member 1 also includes a water inlet pipe 1 (6) and a water inlet pipe 2 (7). The water inlet pipe 1 (6) and the water inlet pipe 2 (7) are both connected to the drainage pipe 1 (3), and the water inlet pipe 1 (6) and the water inlet pipe 2 (7) are respectively provided with a valve 1 (8) and a valve 2 (9).

4. The liquid nitrogen vaporization cold energy utilization device according to claim 1, characterized in that: The drainage component 2 comprises a water pump (10), a drainage pipe 2 (11) and a drainage pipe 3 (12); one end of the drainage pipe 2 (11) is connected to the bottom of the water tank and the other end thereof is connected to the inlet of the water pump (10); one end of the drainage pipe 3 (12) is connected to the outlet of the water pump (10).

5. The liquid nitrogen vaporization cold energy utilization device according to claim 4, characterized in that: The drainage member 2 also includes a water outlet pipe 1 (13) and a water outlet pipe 2 (14). The water outlet pipe 1 (13) and the water outlet pipe 2 (14) are both connected to the other end of the drainage pipe 3 (12). The water outlet pipe 1 (13) and the water outlet pipe 2 (14) are respectively provided with a valve 3 (15) and a valve 4 (16). The water outlet pipe 1 (13) is also provided with a backflow preventer (17).

6. The liquid nitrogen vaporization cold energy utilization device according to claim 1, characterized in that: The water tank is provided with an electromagnetic liquid level meter (18) and a temperature sensor (19).

7. The liquid nitrogen vaporization cold energy utilization device according to claim 1, characterized in that: The water tank comprises a water collecting tank (20) and a plurality of protective plates (21) fixed on the top of the water collecting tank (20); the bottom of the liquid nitrogen vaporizer (1) is fixed in the water collecting tank (20) via a plurality of brackets (22); a liquid nitrogen inlet pipe (23) of the liquid nitrogen vaporizer (1) is located below the liquid level in the water tank; the plurality of protective plates (21) are circumferentially arranged around the liquid nitrogen vaporizer (1); and the plurality of protective plates (21) are connected end to end in sequence.

8. The liquid nitrogen vaporization cold energy utilization device according to claim 7, characterized in that: A flow pusher (24) is installed in the water collecting tank (20).

9. The liquid nitrogen vaporization cold energy utilization device according to claim 1, characterized in that: The liquid nitrogen vaporization cold energy utilization device also includes a top cover (25), which is arranged at the top of the water tank and is detachably connected to the water tank to seal the water tank, and the top cover (25) is provided with an exhaust port (27) and a hook (28); the flow guide member 1 is installed on the inner side of the top cover (25).

10. The liquid nitrogen vaporization cold energy utilization device according to claim 1, characterized in that: A mud collecting groove (29) is formed at the bottom of the water tank. The bottom of the water collecting groove (20) is inclined so as to introduce impurities at the bottom into the mud collecting groove (29). A mud discharge drain pipe (30) is connected to the bottom of the mud collecting groove (29) and a valve five (31) is arranged on the mud discharge drain pipe (30).

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