System for utilizing cold energy of liquid nitrogen vaporization

Abstract

The utility model relates to energy utilization technical field, concretely relates to a cold quantity utilization system of liquid nitrogen vaporization. The cold quantity utilization system includes: liquid nitrogen vaporization mechanism, total heat exchange mechanism, cold quantity utilization mechanism, be suitable for with first heat exchange side connection, supplementary heat exchange mechanism, be suitable for with cold quantity utilization mechanism carries out heat exchange, auxiliary heat exchange mechanism, be suitable for with first heat exchange side connection, the cold quantity utilization system has first state that first heat exchange side with cold quantity utilization mechanism connects, second state that first heat exchange side, supplementary heat exchange mechanism simultaneously with cold quantity utilization mechanism connects, and third state that first heat exchange side simultaneously with cold quantity utilization mechanism, auxiliary heat exchange mechanism connects. When cold quantity normally provides, adopts first state, when cold quantity is insufficient, adopts second state, when cold quantity is too much, adopts third state, thereby can effectively utilize the cold quantity of liquid nitrogen vaporization time variable condition.

Description

Technical Field

[0001] This utility model relates to the field of energy utilization technology, specifically to a cold energy utilization system for liquid nitrogen vaporization. Background Technology

[0002] Nitrogen is a protective gas widely used in modern automotive electronics factories. Nitrogen is typically supplied via liquid nitrogen for transportation and storage, and factories generally use liquid nitrogen vaporizers to convert liquid nitrogen into gas. These vaporizers are usually placed outdoors, and the heat absorbed during vaporization comes from the surrounding air, with heat conducted through metal fins.

[0003] However, the cooling capacity generated by this vaporization is highly variable, easily leading to either insufficient or excessive cooling. Insufficient cooling cannot meet the required output, while excessive cooling can damage heat exchange components.

[0004] Therefore, it is currently impossible to effectively utilize the cooling capacity under varying operating conditions. Utility Model Content

[0005] In view of this, the present invention provides a system for utilizing the cooling energy of liquid nitrogen vaporization to solve the problem of not being able to effectively utilize the cooling energy under time-varying conditions of liquid nitrogen vaporization.

[0006] In a first aspect, this utility model provides a system for utilizing the cold energy of liquid nitrogen vaporization, the system comprising:

[0007] A liquid nitrogen vaporization mechanism, used to vaporize liquid nitrogen;

[0008] The main heat exchange mechanism is provided with a first heat absorption side and a first heat exchange side, and the first heat absorption side is in contact with the liquid nitrogen vaporization mechanism for heat exchange.

[0009] A cold energy utilization mechanism is adapted to be connected to the first heat exchange side;

[0010] A supplementary heat exchange mechanism is provided, which is suitable for exchanging heat with the cold energy utilization mechanism.

[0011] An auxiliary heat exchange mechanism is adapted to be connected to the first heat exchange side;

[0012] The cold energy utilization system has a first state in which the first heat exchange side is connected to the cold energy utilization mechanism, a second state in which the first heat exchange side and the supplementary heat exchange mechanism are simultaneously connected to the cold energy utilization mechanism, and a third state in which the first heat exchange side is simultaneously connected to the cold energy utilization mechanism and the auxiliary heat exchange mechanism.

[0013] Beneficial effects: During liquid nitrogen vaporization, when the cooling capacity is normally supplied, the first state can be adopted, and the main heat exchange mechanism can be used directly to exchange heat with the cooling capacity utilization mechanism; when the cooling capacity is insufficient, the output temperature of the cooling capacity utilization mechanism is difficult to meet the requirements, so it is necessary to supplement the heat exchange mechanism and the main heat exchange mechanism to exchange heat with the cooling capacity utilization mechanism simultaneously; when the cooling capacity is excessive, the excessive cooling capacity is too much for the cooling capacity utilization mechanism to consume, so it is necessary to add an auxiliary heat exchange mechanism to consume the excess cooling capacity, thereby effectively utilizing the cooling capacity under varying operating conditions during liquid nitrogen vaporization.

[0014] In one optional implementation, the total heat exchange mechanism includes:

[0015] A spray assembly is provided corresponding to the liquid nitrogen vaporization mechanism; the spray assembly sprays water flow onto the liquid nitrogen vaporization mechanism;

[0016] A water collection component is installed in the spray area of ​​the spray component to collect the water flow after spraying.

[0017] A conveying assembly, one end of which is connected to the water collection assembly, and the other end of which is connected to the spraying assembly;

[0018] The spray assembly and the water collection assembly constitute the first heat absorption side, and the conveying assembly constitutes the first heat exchange side.

[0019] In one alternative implementation, the conveying assembly includes:

[0020] A delivery pipeline, the first end of which is connected to the water collection assembly, and the second end of which is connected to the spray assembly;

[0021] The first heat exchanger is installed on the delivery pipeline and connected to the cold energy utilization mechanism.

[0022] In one optional implementation, the conveying assembly further includes:

[0023] The first water pump is installed in the delivery pipeline;

[0024] A water storage tank, wherein the inlet of the water storage tank is connected to the water collection assembly, and the outlet of the water storage tank is connected to the first end of the delivery pipeline;

[0025] The first temperature detection device is installed in the water storage tank.

[0026] In one optional implementation, the auxiliary heat exchange mechanism includes:

[0027] The second heat exchanger is provided with a second heat absorption side and a second heat exchange side; the second heat absorption side is in circulating communication with the water storage tank.

[0028] The first switching valve and the second water pump are connected in series and installed on the second heat absorption side;

[0029] The workshop condenser assembly is in circulating connection with the second heat exchange side.

[0030] In one alternative embodiment, the workshop condenser assembly includes:

[0031] The condenser piping is in circulation with the second heat exchange side;

[0032] A cooling tower is installed on the condenser piping.

[0033] In one optional implementation, the supplementary heat exchange mechanism includes:

[0034] The third heat exchanger is provided with a third heat absorption side and a third heat exchange side; the third heat exchange side is connected to the cold energy utilization mechanism and is located downstream of the first heat exchange side along the water flow direction in the cold energy utilization mechanism.

[0035] The workshop evaporator assembly is connected to the third heat absorption side;

[0036] The second switching valve is located on the third heat absorption side and is connected in series with the workshop evaporator assembly.

[0037] In one optional embodiment, the supplementary heat exchange mechanism further includes:

[0038] The second temperature detection device is installed at the water outlet of the cooling capacity utilization mechanism.

[0039] In one alternative implementation, the cooling capacity utilization mechanism is a process cooling water pipeline.

[0040] In one optional embodiment, the liquid nitrogen vaporization mechanism includes:

[0041] Liquid nitrogen storage tank, containing liquid nitrogen;

[0042] A liquid nitrogen vaporizer is connected to the liquid nitrogen storage tank;

[0043] A protective cover is fitted over the outside of the liquid nitrogen vaporizer; the first heat-absorbing side is located inside the protective cover. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this utility model, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the cooling energy utilization system for liquid nitrogen vaporization in an embodiment of this utility model.

[0046] Explanation of reference numerals in the attached figures:

[0047] 1. Liquid nitrogen vaporization mechanism; 11. Liquid nitrogen storage tank; 12. Liquid nitrogen vaporizer; 13. Protective cover;

[0048] 2. Main heat exchange mechanism; 21. Spray assembly; 22. Water collection assembly; 23. Conveying assembly; 231. Conveying pipeline; 232. First heat exchanger; 233. First water pump; 234. Water storage tank; 235. First temperature detection device;

[0049] 3. Cold energy utilization mechanism;

[0050] 4. Supplementary heat exchange mechanism; 41. Third heat exchanger; 42. Workshop evaporator assembly; 43. Second switching valve; 44. Second temperature detection device;

[0051] 5. Auxiliary heat exchange mechanism; 51. Second heat exchanger; 52. First switch valve; 53. Second water pump; 54. Workshop condenser assembly; 541. Condenser piping; 542. Cooling tower. Detailed Implementation

[0052] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0053] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0054] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can also refer to the internal connection of two components; and they can refer to a wireless connection or a wired connection. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0055] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0056] Nitrogen is a protective gas widely used in modern automotive electronics factories. Its transportation and storage are typically handled by liquid nitrogen, which is usually converted into gas using a liquid nitrogen vaporizer (12). This vaporizer is typically placed outdoors, and the heat absorbed during vaporization comes from the surrounding air, conducted through metal fins. However, the cooling capacity generated by this vaporization is highly variable, easily leading to either insufficient or excessive cooling. Insufficient cooling fails to meet the required output, while excessive cooling can damage heat exchange components. Therefore, currently, it is not possible to effectively utilize the cooling capacity under varying operating conditions.

[0057] In view of this, the present invention provides a system for utilizing the cooling energy of liquid nitrogen vaporization to solve the problem of not being able to effectively utilize the cooling energy under time-varying conditions of liquid nitrogen vaporization.

[0058] The following is combined with Figure 1 The following describes embodiments of the present invention.

[0059] According to an embodiment of the present invention, a liquid nitrogen vaporization cold energy utilization system is provided, the cold energy utilization system including a liquid nitrogen vaporization mechanism 1, a main heat exchange mechanism 2, a cold energy utilization mechanism 3, a supplementary heat exchange mechanism 4, and an auxiliary heat exchange mechanism 5.

[0060] Specifically, in this embodiment, the liquid nitrogen vaporization mechanism 1 is used to vaporize liquid nitrogen. Of course, the liquid nitrogen vaporization mechanism 1 can be replaced with other functional components capable of generating heat, and this embodiment does not limit this. The main heat exchange mechanism 2 is provided with a first heat absorption side and a first heat exchange side, with the first heat absorption side contacting the liquid nitrogen vaporization mechanism 1 for heat exchange. For example, the main heat exchange mechanism 2 can be equipped with a heat exchanger and a fan. The fan can generate a room-temperature airflow that blows directly onto the liquid nitrogen vaporization mechanism 1. After passing through the liquid nitrogen vaporization mechanism 1, the room-temperature airflow absorbs heat, forming a low-temperature airflow. After the low-temperature airflow passes through the first heat absorption side of the heat exchanger, the components on the first heat exchange side that need heat exchange can exchange heat with the low-temperature airflow, thereby utilizing the cooling energy of the liquid nitrogen vaporization.

[0061] Of course, this embodiment is merely an example of the heat exchange type of the main heat exchange mechanism 2, but it does not limit it. Those skilled in the art can make changes according to the actual situation, as long as the same technical effect can be achieved.

[0062] Furthermore, in this embodiment, the cold energy utilization mechanism 3 is adapted to be connected to the first heat exchange side. In actual operation, the cold energy absorbed by the total heat exchange mechanism 2 can be transferred to the cold energy utilization mechanism 3. Regarding the specific type of the cold energy utilization mechanism 3, those skilled in the art can adjust it according to actual conditions, as long as the cold energy can be utilized for production or other applications.

[0063] Furthermore, in this embodiment, the supplementary heat exchange mechanism 4 is adapted to exchange heat with the cold energy utilization mechanism 3. The function of the supplementary heat exchange mechanism 4 is that when the liquid nitrogen vaporization mechanism 1 cannot provide sufficient cold energy, the supplementary heat exchange mechanism 4 can be activated to supplement the cold energy utilization mechanism 3 with the required cold energy.

[0064] Furthermore, in this embodiment, the auxiliary heat exchange mechanism 5 is adapted to be connected to the first heat exchange side. The function of the auxiliary heat exchange mechanism 5 is that when the cooling capacity provided by the liquid nitrogen vaporization mechanism 1 exceeds the cooling capacity required by the cooling capacity utilization mechanism 3, the auxiliary heat exchange mechanism 5 can be activated, thereby assisting the cooling capacity utilization mechanism 3 in consuming the excess cooling capacity.

[0065] It should be noted that this embodiment does not limit the specific types of the supplementary heat exchange mechanism 4 and the auxiliary heat exchange mechanism 5. Those skilled in the art can make adjustments according to the actual situation, as long as the same energy exchange function can be achieved.

[0066] In this embodiment, the connection relationships of the various parts of the cooling capacity utilization system differ depending on the amount of cooling. Specifically, the cooling capacity utilization system has three states: a first state where the first heat exchange side is connected to the cooling capacity utilization mechanism 3 when the cooling capacity is normally provided; a second state where the first heat exchange side and the supplementary heat exchange mechanism 4 are simultaneously connected to the cooling capacity utilization mechanism 3 when the cooling capacity is insufficient; and a third state where the first heat exchange side is simultaneously connected to the cooling capacity utilization mechanism 3 and the auxiliary heat exchange mechanism 5 when the cooling capacity is excessive.

[0067] With this setup, during liquid nitrogen vaporization, when the cooling capacity is normally provided, the first state is adopted, and the main heat exchange mechanism 2 can directly exchange heat with the cooling capacity utilization mechanism 3. When the cooling capacity is insufficient, the temperature output by the cooling capacity utilization mechanism 3 is difficult to meet the requirements, so it is necessary to supplement the cooling capacity utilization mechanism 4 to exchange heat with the main heat exchange mechanism 2 simultaneously. When the cooling capacity is excessive, the excessive cooling capacity makes it impossible for the cooling capacity utilization mechanism 3 to consume it, so it is necessary to add an auxiliary heat exchange mechanism 5 to consume the excessive cooling capacity, thereby effectively utilizing the cooling capacity under varying operating conditions during liquid nitrogen vaporization.

[0068] Furthermore, in an optional embodiment, the total heat exchange mechanism 2 includes a spray assembly 21, a water collection assembly 22, and a conveying assembly 23.

[0069] Specifically, in this embodiment, the spray assembly 21 is correspondingly arranged with the liquid nitrogen vaporization mechanism 1, and the spray assembly 21 sprays water onto the liquid nitrogen vaporization mechanism 1. The water collection assembly 22 is arranged in the spray area of ​​the spray assembly 21 to collect the sprayed water. One end of the conveying assembly 23 is connected to the water collection assembly 22, and the other end of the conveying assembly 23 is connected to the spray assembly 21. The spray assembly 21 and the water collection assembly 22 constitute the first heat absorption side, and the conveying assembly 23 constitutes the first heat exchange side.

[0070] In actual operation, the spray assembly 21 sprays room-temperature water onto the liquid nitrogen vaporization mechanism 1. Upon contact with the liquid nitrogen vaporization mechanism 1, the water absorbs the cooling energy generated during vaporization, thus becoming cold water, achieving heat absorption during heat exchange. The cold water collects in the water collection assembly 22 and is then transported outwards via the conveying assembly 23. The conveying assembly 23, acting as the first heat exchange side, can exchange heat with the cooling energy utilization mechanism 3 and the auxiliary heat exchange mechanism 5. The room-temperature water formed after heat exchange re-enters the spray assembly 21, thus creating a cycle.

[0071] Furthermore, in an optional embodiment, the delivery assembly 23 includes a delivery pipeline 231 and a first heat exchanger 232.

[0072] Specifically, in this embodiment, the first end of the conveying pipe 231 is connected to the water collection assembly 22, and the second end of the conveying pipe 231 is connected to the spray assembly 21. A first heat exchanger 232 is disposed on the conveying pipe 231 and connected to the cold energy utilization mechanism 3. The first heat exchanger 232 can serve as a first heat exchange side for external heat exchange.

[0073] Furthermore, in an optional embodiment, the conveying assembly 23 further includes a first water pump 233, a water storage tank 234, and a first temperature detection device 235.

[0074] A first water pump 233 is installed in the delivery pipeline 231. The inlet of the water storage tank 234 is connected to the water collection assembly 22, and the outlet of the water storage tank 234 is connected to the first end of the delivery pipeline 231. A first temperature detection device 235 is installed in the water storage tank 234. The first temperature detection device 235 is used to detect the temperature of the cold water in the water storage tank 234 to determine the state of the cooling capacity provided by the liquid nitrogen vaporization mechanism 1. Thus, the cooling capacity utilization system can automatically switch connection states.

[0075] Furthermore, in an optional embodiment, the auxiliary heat exchange mechanism 5 includes a second heat exchanger 51, a first switching valve 52, a second water pump 53, and a workshop condenser assembly 54.

[0076] Specifically, the second heat exchanger 51 is provided with a second heat absorption side and a second heat exchange side. The second heat absorption side is circulatedly connected to the water storage tank 234. The first switch valve 52 and the second water pump 53 are connected in series on the second heat absorption side. The workshop condenser assembly 54 is circulatedly connected to the second heat exchange side.

[0077] In actual operation, when there is too much cooling energy from liquid nitrogen vaporization, ice will form on the surface of the fins of the liquid nitrogen vaporization mechanism 1. On the one hand, the water path for cooling energy recovery will be blocked, and the cooling energy recovery function will fail. On the other hand, it will hinder the vaporization process of liquid nitrogen and affect the normal operation of the production line. At this time, it is necessary to release the excess cooling energy in a timely manner.

[0078] When the first temperature detection device 235 detects that the water temperature is lower than the first preset threshold, it indicates that the liquid nitrogen vaporization mechanism 1 is providing too much cooling capacity, and the auxiliary heat exchange mechanism 5 needs to be activated. Therefore, the first switch valve 52 automatically opens. When the first temperature detection device 235 detects that the water temperature is higher than the first preset threshold, it indicates that the cooling capacity provided by the liquid nitrogen vaporization mechanism 1 is normal or insufficient, and the auxiliary heat exchange mechanism 5 needs to be shut down. Therefore, the first switch valve 52 automatically closes.

[0079] Furthermore, in an optional embodiment, the workshop condenser assembly 54 includes a condenser pipe 541 and a cooling tower 542. Specifically, in this embodiment, the condenser pipe 541 is in circulating communication with the second heat exchange side, and the cooling tower 542 is disposed on the condenser pipe 541.

[0080] The high-temperature cooling water flowing out of the condenser pipe 541 flows into the second heat exchange side of the second heat exchanger 51 for pre-cooling. After pre-cooling, the cooling water flows into the cooling tower 542 and then back into the condenser pipe 541. Under this condition, the excess cooling capacity in the liquid nitrogen vaporization mechanism 1 is utilized by the cooling water, achieving the purpose of pre-cooling and reducing the energy consumption of the cooling tower 542.

[0081] Furthermore, in an optional embodiment, the supplementary heat exchange mechanism 4 includes a third heat exchanger 41, a workshop evaporator assembly 42, and a second switching valve 43.

[0082] Specifically, the third heat exchanger 41 is provided with a third heat absorption side and a third heat exchange side. The third heat exchange side is connected to the cold energy utilization mechanism 3 and is located downstream of the first heat exchange side along the water flow direction in the cold energy utilization mechanism 3. The workshop evaporator assembly 42 is connected to the third heat absorption side, and the second switching valve 43 is provided on the third heat absorption side and connected in series with the workshop evaporator assembly 42.

[0083] In actual operation, when the first temperature detection device 235 detects that the water temperature is higher than the first preset threshold and lower than the second preset threshold, it indicates that the cooling capacity provided by the liquid nitrogen vaporization mechanism 1 is normal, and the first switch valve 52 and the second switch valve 43 automatically close; when the first temperature detection device 235 detects that the water temperature is higher than the second preset threshold, it indicates that the cooling capacity provided by the liquid nitrogen vaporization mechanism 1 is insufficient, the first switch valve 52 closes, and the second switch valve 43 automatically opens.

[0084] Of course, the first switching valve 52 and the second switching valve 43 can be set as electric proportional regulating valves, which can further refine the heat exchange rate.

[0085] Furthermore, in an optional embodiment, the supplementary heat exchange mechanism 4 further includes a second temperature detection device 44, which is disposed at the outlet end of the cooling capacity utilization mechanism 3. Similarly, the second temperature detection device 44 is used to detect the outlet water temperature of the cooling capacity utilization mechanism 3, preventing the outlet water temperature from being outside the normal outlet water range, and can also be linked with the first temperature detection device 235 for regulation.

[0086] Furthermore, in an optional embodiment, the cold energy utilization mechanism 3 is a process cooling water pipeline.

[0087] Furthermore, in an optional embodiment, the liquid nitrogen vaporization mechanism 1 includes a liquid nitrogen storage tank 11, a liquid nitrogen vaporizer 12, and a protective cover 13.

[0088] Specifically, the liquid nitrogen storage tank 11 stores liquid nitrogen, the liquid nitrogen vaporizer 12 is connected to the liquid nitrogen storage tank 11, the protective cover 13 is fitted over the outside of the liquid nitrogen vaporizer 12, and the first heat-absorbing side is located inside the protective cover 13.

[0089] In summary, this cooling capacity utilization system can fully utilize the cooling capacity of liquid nitrogen vaporization, reducing the energy consumption of cooling tower 542 and preventing the water storage tank from freezing when there is excessive cooling capacity. When there is insufficient cooling capacity, it can supplement the process cooling water using the cooling capacity of the workshop cooling water. This cooling capacity utilization system can also be linked with the HVAC system to achieve energy saving and emission reduction under variable load conditions. It can also replace the process chiller unit to supply process cooling water, saving the purchase cost of the process chiller.

[0090] Although embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A system for utilizing the cooling energy of liquid nitrogen vaporization, characterized in that, include: Liquid nitrogen vaporization mechanism (1), used to vaporize liquid nitrogen; The main heat exchange mechanism (2) is provided with a first heat absorption side and a first heat exchange side, and the first heat absorption side is in contact with the liquid nitrogen vaporization mechanism (1) for heat exchange; The cold energy utilization mechanism (3) is adapted to be connected to the first heat exchange side; A supplementary heat exchange mechanism (4) is provided, which is adapted to exchange heat with the cold energy utilization mechanism (3); An auxiliary heat exchange mechanism (5) is adapted to be connected to the first heat exchange side; The cold energy utilization system has a first state in which the first heat exchange side is connected to the cold energy utilization mechanism (3), a second state in which the first heat exchange side and the supplementary heat exchange mechanism (4) are simultaneously connected to the cold energy utilization mechanism (3), and a third state in which the first heat exchange side is simultaneously connected to the cold energy utilization mechanism (3) and the auxiliary heat exchange mechanism (5).

2. The cold energy utilization system according to claim 1, characterized in that, The total heat exchange mechanism (2) includes: A spray assembly (21) is provided corresponding to the liquid nitrogen vaporization mechanism (1); the spray assembly (21) sprays water flow to the liquid nitrogen vaporization mechanism (1); A water collection component (22) is installed in the spray area of ​​the spray component (21) to collect the water flow after spraying; A conveying assembly (23), one end of which is connected to the water collection assembly (22), and the other end of which is connected to the spray assembly (21); The spray assembly (21) and the water collection assembly (22) constitute the first heat absorption side, and the conveying assembly (23) constitutes the first heat exchange side.

3. The cold energy utilization system according to claim 2, characterized in that, The conveying assembly (23) includes: A delivery pipeline (231) is provided, the first end of which is connected to the water collection assembly (22), and the second end of which is connected to the spray assembly (21). The first heat exchanger (232) is installed on the conveying pipeline (231) and connected to the cold energy utilization mechanism (3).

4. The cold energy utilization system according to claim 3, characterized in that, The conveying assembly (23) also includes: The first water pump (233) is installed in the delivery pipeline (231); A water storage tank (234) is provided, with its inlet connected to the water collection assembly (22) and its outlet connected to the first end of the delivery pipeline (231). The first temperature detection device (235) is installed in the water storage tank (234).

5. The cold energy utilization system according to claim 4, characterized in that, The auxiliary heat exchange mechanism (5) includes: The second heat exchanger (51) is provided with a second heat absorption side and a second heat exchange side; the second heat absorption side is circulatedly connected to the water storage tank (234); The first switching valve (52) and the second water pump (53) are connected in series and installed on the second heat absorption side; The workshop condenser assembly (54) is in circulation with the second heat exchange side.

6. The cold energy utilization system according to claim 5, characterized in that, The workshop condenser assembly (54) includes: The condenser piping (541) is in circulation with the second heat exchange side; A cooling tower (542) is installed on the condenser pipe (541).

7. The cold energy utilization system according to any one of claims 1 to 6, characterized in that, The supplementary heat exchange mechanism (4) includes: The third heat exchanger (41) is provided with a third heat absorption side and a third heat exchange side; the third heat exchange side is connected to the cold energy utilization mechanism (3) and is located downstream of the first heat exchange side along the water flow direction in the cold energy utilization mechanism (3); The workshop evaporator assembly (42) is connected to the third heat-absorbing side; The second switching valve (43) is located on the third heat absorption side and is connected in series with the workshop evaporator assembly (42).

8. The cold energy utilization system according to claim 7, characterized in that, The supplementary heat exchange mechanism (4) also includes: The second temperature detection device (44) is installed at the outlet end of the cold energy utilization mechanism (3).

9. The cold energy utilization system according to any one of claims 1 to 6, characterized in that, The cold energy utilization mechanism (3) is a process cooling water pipeline.

10. The cold energy utilization system according to any one of claims 1 to 6, characterized in that, The liquid nitrogen vaporization mechanism (1) includes: Liquid nitrogen storage tank (11) stores liquid nitrogen; A liquid nitrogen vaporizer (12) is connected to the liquid nitrogen storage tank (11); A protective cover (13) is fitted over the outside of the liquid nitrogen vaporizer (12); the first heat-absorbing side is located inside the protective cover (13).

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