Cryogenic continuous processing and cold recovery system and method

Abstract

The present invention relates to the field of cryogenic treatment technology, and in particular to a cryogenic continuous treatment and cold recovery system and method, wherein the cryogenic continuous treatment and cold recovery system comprises a cryogenic treatment device, a cold recovery device and a material conveying device, wherein the first exhaust port of the cryogenic treatment device, the first air inlet of the cold recovery device, the second exhaust port of the cold recovery device and the second air inlet of the cryogenic treatment device are sequentially connected to form a first cold circulation loop; the third exhaust port of the cold recovery device, the third air inlet of the cryogenic treatment device, the fourth exhaust port of the cryogenic treatment device and the fourth air inlet of the cold recovery device are sequentially connected to form a second cold circulation loop, and the material conveying device passes through the cryogenic treatment device to convey the material to be cold treated through the cryogenic treatment device. The full recovery of cold is achieved. By adding a material conveying device for the material to be cold treated, the problem of low efficiency caused by traditional manual material replacement is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of cryogenic treatment, and in particular to a system and method for continuous cryogenic treatment and cold recovery. Background Art

[0002] At present, cryogenic treatment technology (such as cold treatment of metal materials, low-temperature quick freezing of food, etc.) usually uses liquid nitrogen as a refrigerant to perform low-temperature treatment on materials to improve the performance of the materials (such as the wear resistance and dimensional stability of metal materials, and the storage time of food). During the cryogenic treatment process, liquid nitrogen is sprayed into the low-temperature treatment device, vaporizes after absorbing heat, and is usually discharged to the environment at a temperature not higher than the material processing temperature, resulting in a large amount of cold loss. In addition, because traditional cryogenic treatment equipment requires manual replacement of cold treatment materials from time to time, the overall efficiency is low.

[0003] In order to solve the problem of cold loss caused by direct discharge of low-temperature nitrogen, the existing technology usually uses phase change materials to recover the cold of the discharged low-temperature nitrogen, and then uses heat exchange equipment to send the cold back to the low-temperature treatment device when needed, thereby reducing the energy consumption of the system. However, the actual exhaust temperature after passing through the cold recovery device is still lower than the room temperature, making it difficult to recover 100% of the cold. In addition, the cold recovery device is non-continuous. During the cold utilization process, the working gas passed into the cold recovery device needs to be dehumidified or additional nitrogen needs to be used, which increases the difficulty and cost of operation. During the manual replacement of materials, the material handling efficiency is low and a large cold loss will be caused during the continuous unpacking process. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a deep cold continuous treatment and cold recovery system, in which a low temperature treatment device and a cold recovery device are connected through a cold circulation pipeline to form a closed circulation system, thereby realizing full recovery of cold. By adding a material conveying device for the material to be cold treated, the problem of low efficiency caused by traditional manual material replacement is solved.

[0005] The invention also provides a method for continuous deep cooling treatment and cold energy recovery.

[0006] According to the first aspect of the embodiment of the present invention, the deep cold continuous treatment and cold energy recovery system includes a low-temperature treatment device, a cold energy recovery device and a material conveying device. The first exhaust port of the low-temperature treatment device, the first air inlet of the cold energy recovery device, the second exhaust port of the cold energy recovery device and the second air inlet of the low-temperature treatment device are connected in sequence to form a first cold energy circulation loop; the third exhaust port of the cold energy recovery device, the third air inlet of the low-temperature treatment device, the fourth exhaust port of the low-temperature treatment device and the fourth air inlet of the cold energy recovery device are connected in sequence to form a second cold energy circulation loop, and the material conveying device passes through the low-temperature treatment device to convey the material to be cold-treated through the low-temperature treatment device.

[0007] According to one embodiment of the present invention, the low-temperature treatment device includes a cryogenic box and a refrigeration component, the first exhaust port and the third air inlet are both located at the top of the cryogenic box, the second air inlet and the fourth exhaust port are both located at the bottom of the cryogenic box, and the refrigeration component is arranged in the cryogenic box and is located on one side of the cryogenic box close to the second air inlet.

[0008] According to one embodiment of the present invention, the cold recovery device includes a cold storage box and cold storage material filled in the cold storage box, the first air inlet and the third exhaust port are both located at the top of the cold storage box, and the second exhaust port and the fourth air inlet are both located at the bottom of the cold storage box.

[0009] According to one embodiment of the present invention, the cooling assembly includes a fan, a disperser and a liquid nitrogen tank, the liquid nitrogen tank is connected to the disperser, the fan and the disperser are both located in the cryogenic box, and the fan is located below the disperser.

[0010] According to one embodiment of the present invention, the material conveying device passes through the cryogenic box and is located above the disperser.

[0011] According to one embodiment of the present invention, a first temperature detector is provided at the top of the deep cold box, and a second temperature detector is provided at the top and bottom of the cold storage box.

[0012] According to one embodiment of the present invention, a first exhaust valve is provided at the first exhaust port, a first intake valve is provided at the first intake port, a second exhaust valve is provided at the second exhaust port, and a second intake valve is provided at the second intake port.

[0013] According to one embodiment of the present invention, a third exhaust valve is provided at the third exhaust port, a third intake valve is provided at the third intake port, a fourth exhaust valve is provided at the fourth exhaust port, and a fourth intake valve is provided at the fourth intake port.

[0014] According to an embodiment of the present invention, a branch pipeline is provided on the pipeline communicating the second exhaust port with the second air inlet, and a pressure relief valve is provided on the branch pipeline.

[0015] According to the second aspect of the present invention, a method for cryogenic continuous treatment and cold recovery using the above-mentioned cryogenic continuous treatment and cold recovery system comprises:

[0016] Initial cooling treatment:

[0017] The liquid nitrogen supply is turned on, the fan rotates forward, the second cooling circulation loop is closed, the connecting pipeline between the first exhaust port of the cryogenic treatment device of the first cooling circulation loop and the first air inlet of the cooling recovery device is opened, the connecting pipeline between the second exhaust port of the cooling recovery device and the second air inlet of the cryogenic treatment device is closed, and the branch pipeline connected to the second exhaust port is opened;

[0018] When the temperature of the middle part of the cold storage material in the cold recovery device is lower than the preset temperature, the branch pipe connected to the second exhaust port is closed, the liquid nitrogen supply is stopped, the fan is reversed, the second cold circulation loop is opened, and the first cold circulation loop is closed;

[0019] First cooling cycle treatment:

[0020] When the temperature of the top of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan rotates forward, the first cold circulation loop is opened, and the second cold circulation loop is closed;

[0021] Second cooling cycle treatment:

[0022] When the temperature at the bottom of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan is reversed, the first cold circulation loop is closed, and the second cold circulation loop is opened;

[0023] The first cooling cycle treatment and the second cooling cycle treatment are performed alternately in sequence.

[0024] The above one or more technical solutions in the embodiments of the present invention have at least the following technical effects: the cryogenic continuous treatment and cold recovery system in the embodiments of the present invention provides a cryogenic treatment device that can recycle the cold of the cooling medium, in order to solve the problems that the existing low-temperature treatment device cannot completely recover the cold of the cooling medium, and the operation is difficult and the cost is high during the cold recovery process. The low-temperature treatment device and the cold recovery device are connected through a cold circulation pipeline to form a closed circulation system to achieve full recovery of cold. Two sets of air inlets and two sets of exhaust ports are respectively provided on the low-temperature treatment device and the cold recovery device to form two independent first cold circulation loops and second cold circulation loops, respectively, and the flow direction of the cooling medium in the first cold circulation loop is opposite to that in the second cold circulation loop. The first cooling circulation loop allows the material to be cooled to exchange heat with the cooling medium in the low-temperature treatment device, and then the vaporized low-temperature cooling medium enters the cooling recovery device, in which all the cooling is recovered and the cooling medium is discharged, or returns to the low-temperature treatment device after heat exchange and cooling in the cooling recovery device; the second cooling circulation loop allows the cooling medium in the low-temperature treatment device to enter the cooling recovery device, and exchange heat with the cold recovered in the cooling recovery device for cooling, and then returns to the low-temperature treatment device for heat exchange with the material to be cooled, thereby greatly reducing the consumption of cooling medium.

[0025] The deep cold continuous treatment and cold energy recovery system of the embodiment of the present invention solves the problem of low efficiency caused by traditional manual material replacement by adding a material conveying device for the material to be cold treated. The material conveying device runs through the low-temperature treatment device. The material conveying device is operated to convey the material to be cold treated to the low-temperature treatment device. After the material in the low-temperature treatment device completes the cold treatment, it is sent out of the low-temperature treatment device through the material conveying device, and new material to be cold treated is automatically sent into the low-temperature treatment device for cold treatment. The new material to be cold treated can be automatically replaced under the premise of minimizing the cold energy loss in the low-temperature treatment device, and the material processing efficiency is improved.

[0026] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings or will be understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0028] Figure 1 It is a structural schematic diagram of a deep cold continuous treatment and cold recovery system according to an embodiment of the present invention.

[0029] Reference numerals:

[0030] 1: low temperature treatment device; 11: deep cold box; 12: cooling component; 111: first temperature detector; 121: fan; 122: disperser; 123: liquid nitrogen tank; 124: liquid nitrogen control valve; 125: motor;

[0031] 2: cold recovery device; 21: cold storage box; 22: cold storage material; 211: second temperature detector;

[0032] 3: Material conveying device; 31: Material to be cooled;

[0033] 41: first exhaust valve; 42: second exhaust valve; 43: third exhaust valve; 44: fourth exhaust valve;

[0034] 51: first air intake valve; 52: second air intake valve; 53: third air intake valve; 54: fourth air intake valve;

[0035] 61: first pipeline; 62: second pipeline; 63: third pipeline; 64: fourth pipeline;

[0036] 7: branch line; 71: pressure relief valve. DETAILED DESCRIPTION

[0037] The following embodiments of the present invention are described in further detail in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0038] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance, nor can they be understood as representing any order or number of times.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0040] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0041] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic representations of the above terms are not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0042] like Figure 1 As shown, the cryogenic continuous treatment and cold energy recovery system provided by the embodiment of the present invention includes a cryogenic treatment device 1, a cold energy recovery device 2 and a material conveying device 3, the first exhaust port of the cryogenic treatment device 1, the first air inlet of the cold energy recovery device 2, the second exhaust port of the cold energy recovery device 2 and the second air inlet of the cryogenic treatment device 1 are connected in sequence to form a first cold energy circulation loop; the third exhaust port of the cold energy recovery device 2, the third air inlet of the cryogenic treatment device 1, the fourth exhaust port of the cryogenic treatment device 1 and the fourth air inlet of the cold energy recovery device 2 are connected in sequence to form a second cold energy circulation loop, and the material conveying device 3 passes through the cryogenic treatment device 1 to convey the material 31 to be cold-treated through the cryogenic treatment device 1.

[0043] The cryogenic continuous treatment and cold recovery system of the embodiment of the present invention provides a cryogenic treatment device that can recycle the cold of the cooling medium to address the problems that the existing cryogenic treatment devices cannot completely recover the cold of the cooling medium, and the operation is difficult and costly during the cold recovery process. The cryogenic treatment device 1 and the cold recovery device 2 are connected through a cold circulation pipeline to form a closed circulation system to achieve full recovery of cold. Two sets of air inlets and two sets of exhaust ports are respectively provided on the cryogenic treatment device 1 and the cold recovery device 2 to form two independent first cold circulation loops and second cold circulation loops, respectively, and the flow direction of the cooling medium in the first cold circulation loop is opposite to that in the second cold circulation loop. The first cold circulation loop allows the material to be cold-treated 31 to exchange heat with the cooling medium in the low-temperature treatment device 1, and then the vaporized low-temperature cooling medium enters the cold recovery device 2, and the cold is fully recovered in the cold recovery device 2 and the cooling medium is discharged, or the cooling medium is returned to the low-temperature treatment device 1 after heat exchange and cooling in the cold recovery device 2; the second cold circulation loop allows the cooling medium in the low-temperature treatment device 1 to enter the cold recovery device 2, and heat exchange and cool it with the cold recovered in the cold recovery device 2, and then return to the low-temperature treatment device 1 to exchange heat with the material to be cold-treated 31, thereby greatly reducing the consumption of the cooling medium.

[0044] The deep cold continuous treatment and cold energy recovery system of the embodiment of the present invention solves the problem of low efficiency caused by traditional manual material replacement by adding a material conveying device 3 for the material 31 to be cold treated. The material conveying device 3 runs through the low-temperature treatment device 1. The material conveying device 3 operates to convey the material 31 to be cold treated to the low-temperature treatment device 1. After the material in the low-temperature treatment device 1 completes the cold treatment, it is sent out of the low-temperature treatment device 1 through the material conveying device 3, and the new material 31 to be cold treated is automatically sent into the low-temperature treatment device 1 for cold treatment. The new material 31 to be cold treated can be automatically replaced under the premise of minimizing the cold energy loss in the low-temperature treatment device 1, and the material processing efficiency can be improved.

[0045] In this embodiment, the material conveying device 3 can simultaneously use multiple parallel arranged automatic conveying devices to convey the material to increase the amount of cold-treated material each time. In other embodiments, in addition to the parallel design structure, a spiral ascending arrangement can also be used to extend the cold treatment time of the material and increase the amount of cold-treated material each time.

[0046] According to one embodiment of the present invention, the low temperature treatment device 1 includes a cryogenic box 11 and a cooling assembly 12, the first exhaust port and the third air inlet are both located at the top of the cryogenic box 11, the second air inlet and the fourth exhaust port are both located at the bottom of the cryogenic box 11, and the cooling assembly 12 is arranged in the cryogenic box 11 and is located on one side of the cryogenic box 11 near the second air inlet. The cold recovery device 2 includes a cold storage box 21 and a cold storage material 22 filled in the cold storage box 21, the first air inlet and the third exhaust port are both located at the top of the cold storage box 21, and the second exhaust port and the fourth air inlet are both located at the bottom of the cold storage box 21.

[0047] In this embodiment, the cryogenic box 11 is vertically arranged, and the cooling medium therein flows from top to bottom or from bottom to top, and the cooling assembly 12 provides cooling medium for the low temperature treatment device 1 and the entire system cold cycle. The cold storage box 21 is also vertically arranged, and the cold storage material 22 is filled therein. The cooling medium exchanges heat with the cold storage material 22 and enters and exits the cold storage box 21 at the top or bottom.

[0048] In the first cooling circulation loop, after the cooling medium exchanges heat with the material to be cooled 31, it is discharged from the first exhaust port on the top of the cryogenic box 11, passes through the first pipeline 61, and enters the cold storage box 21 through the first air inlet on the top of the cold storage box 21. After heat exchange with the cold storage material 22, the cooling medium is discharged from the second exhaust port at the bottom of the cold storage box 21, passes through the second pipeline 62, and enters the cold storage box 11 through the second air inlet at the bottom of the cold storage box 11, and exchanges heat with the material to be cooled 31.

[0049] In the second cooling circulation loop, the cooling medium is discharged from the fourth exhaust port at the bottom of the cryogenic box 11, passes through the third pipeline 63, and enters the cold storage box 21 through the fourth air inlet at the bottom of the cold storage box 21. After heat exchange with the cold storage material 22, the cooling medium is discharged from the third exhaust port at the top of the cold storage box 21, passes through the fourth pipeline 64, and enters the cryogenic box 11 through the third air inlet at the top of the cryogenic box 11, and exchanges heat with the material 31 to be cooled.

[0050] In this embodiment, the cold storage box 21 is an external cavity with a heat-insulating material, and the heat-insulating material is selected from polyurethane foam material, etc. The cold storage material 22 is a solid cold storage material or a phase-change cold storage material for recovering the cold amount of low-temperature nitrogen. The cold storage material 22 can be selected from a low-temperature solid cold storage material such as a wire mesh or particles made of stone, stainless steel, copper, etc., or a phase-change cold storage material such as carbon dioxide, ammonia, etc.

[0051] According to one embodiment of the present invention, the cooling component 12 includes a fan 121, a disperser 122 and a liquid nitrogen tank 123, the liquid nitrogen tank 123 is connected to the disperser 122, the fan 121 and the disperser 122 are both located in the cryogenic box 11, and the fan 121 is located below the disperser 122. In this embodiment, the cooling medium is provided by liquid nitrogen, the fan 121 is located at the bottom of the cryogenic box 11, the disperser 122 is installed above the fan 121, and the liquid nitrogen tank 123 is connected to the disperser 122 through a liquid nitrogen delivery pipeline, so as to evenly disperse the liquid nitrogen, and the low-temperature nitrogen is controlled by the fan 121. When the fan 121 rotates forward, the low-temperature nitrogen flows in the first cold circulation loop, and when the fan 121 rotates reversely, the low-temperature nitrogen flows in the second cold circulation loop.

[0052] In this embodiment, a liquid nitrogen control valve 124 is provided on the liquid nitrogen delivery pipeline connecting the liquid nitrogen tank 123 and the disperser 122 to control the time and flow of liquid nitrogen input. The fan 121 is connected via an external motor 125 to control the start, stop and direction of the fan 121.

[0053] In this embodiment, the cooling medium may also be other cryogenic liquids such as liquid argon. In the process of cold recovery and utilization, by using the low-temperature nitrogen inside the system as the working medium, the dehumidification operation involved in the existing equipment that needs to absorb external air as the working medium, or the high cost problem involved in the existing equipment that needs to introduce additional dry nitrogen as the working medium is avoided.

[0054] According to one embodiment of the present invention, the material conveying device 3 passes through the cryogenic box 11 and is located above the disperser 122. In this embodiment, the material 31 to be treated by the material conveying device 3 is continuously sent into the cryogenic box 11 in the horizontal direction, and then sent to the outside of the cryogenic box 11 after cold treatment, and new materials are automatically sent into the cryogenic box 11 for treatment. After the disperser 122 disperses the liquid nitrogen, since the fan 121 is below the disperser 122, the liquid nitrogen can flow upward and evenly contact the material 31 to be treated by the material conveying device 3 after the fan 121 rotates. After heat exchange, the liquid nitrogen absorbs heat and vaporizes to form low-temperature nitrogen. Under the action of the fan 121, it continues to move upward and enters the first exhaust port, or the nitrogen entering the cryogenic box 11 from the third air inlet contacts the material 31 to be treated by the material conveying device 3. After heat exchange, the nitrogen is discharged from the fourth exhaust port to the cold recovery device 2 under the action of the fan 121.

[0055] According to one embodiment of the present invention, a first temperature detector 111 is provided at the top of the cryogenic box 11, and a second temperature detector 211 is provided at the top and bottom of the cold storage box 21. In this embodiment, a first temperature detector 111 is arranged in the cryogenic box 11 for detecting the real-time temperature inside the cryogenic box 11, and a second temperature detector 211 for detecting the real-time temperature inside the cold storage box 21 is arranged near the top and bottom of the cold storage box 21. The direction of nitrogen circulation can be controlled by the relationship between the detected temperatures of the first temperature detector 111 and the second temperature detector 211. In this embodiment, both the first temperature detector 111 and the second temperature detector 211 are thermometers.

[0056] According to one embodiment of the present invention, a first exhaust valve 41 is provided at the first exhaust port, a first intake valve 51 is provided at the first intake port, a second exhaust valve 42 is provided at the second exhaust port, and a second intake valve 52 is provided at the second intake port. A third exhaust valve 43 is provided at the third exhaust port, a third intake valve 53 is provided at the third intake port, a fourth exhaust valve 44 is provided at the fourth exhaust port, and a fourth intake valve 54 is provided at the fourth intake port.

[0057] In this embodiment, the cold circulation pipeline includes a first pipeline 61, a second pipeline 62, a third pipeline 63 and a fourth pipeline 64 connecting the deep cold box 11 and the cold storage box 21, all of which are arranged outside the deep cold box 11 and the cold storage box 21, and each is equipped with a switch valve, that is, the first pipeline 61 connecting the first exhaust port and the first air inlet is correspondingly provided with a first exhaust valve 41 and a first air inlet valve 51, the second pipeline 62 connecting the second exhaust port and the second air inlet is correspondingly provided with a second exhaust valve 42 and a second air inlet valve 52, the third pipeline 63 connecting the fourth exhaust port and the fourth air inlet is correspondingly provided with a fourth exhaust valve 44 and a fourth air inlet valve 54, and the fourth pipeline 64 connecting the third exhaust port and the third air inlet is correspondingly provided with a third exhaust valve 43 and a third air inlet valve 53.

[0058] When the first cooling circulation loop is opened, the first exhaust valve 41, the first air intake valve 51, the second exhaust valve 42 and the second air intake valve 52 are opened; when the first cooling circulation loop is closed, these four valves are also closed accordingly; when the second cooling circulation loop is opened, the third exhaust valve 43, the third air intake valve 53, the fourth exhaust valve 44 and the fourth air intake valve 54 are opened; when the second cooling circulation loop is closed, these four valves are also closed accordingly.

[0059] Each cooling circulation pipeline is wrapped with insulation material to reduce cooling loss. When the first cooling circulation loop or the second cooling circulation loop is operated, the control of the relevant air inlet valve or exhaust valve can be manual control or automatic control, so as to circulate and utilize the low-temperature nitrogen cooling capacity.

[0060] According to one embodiment of the present invention, a branch line 7 is provided on the pipeline connecting the second exhaust port and the second air inlet, and a pressure relief valve 71 is provided on the branch line 7. In this embodiment, during the initial cooling process, the cooling component 12 is turned on, and the liquid nitrogen is heat-exchanged with the material to be cooled and gasified to form low-temperature nitrogen, which then enters the cold storage box 21 through the deep cold box 11 through the first pipeline, stores the cold in the cold storage material 22, and then is discharged through the pressure relief valve 71 of the branch line 7 connected to the second exhaust port at the bottom of the cold storage box 21, so as to recover the cold of the low-temperature nitrogen in the cold recovery device 2. That is, the first exhaust valve 41, the first air inlet valve 51, the second exhaust valve 42 and the pressure relief valve 71 are opened, and the second air inlet valve 52, the third exhaust valve 43, the third air inlet valve 53, the fourth exhaust valve 44 and the fourth air inlet valve 54 are all closed.

[0061] The embodiment of the present invention further provides a method for cryogenic continuous treatment and cold recovery using the cryogenic continuous treatment and cold recovery system of the above embodiment, comprising:

[0062] Initial cooling treatment:

[0063] The liquid nitrogen supply is turned on, the fan 121 rotates forward, the second cooling circulation loop is closed, the connecting pipeline between the first exhaust port of the cryogenic treatment device 1 of the first cooling circulation loop and the first air inlet of the cooling recovery device 2 is opened, the connecting pipeline between the second exhaust port of the cooling recovery device 2 and the second air inlet of the cryogenic treatment device 1 is closed, and the branch pipeline 7 connected to the second exhaust port is opened to discharge the high-temperature gas that is difficult to recycle during the initial cooling process;

[0064] When the temperature of the middle part of the cold storage material 22 in the cold recovery device 2 is lower than the preset temperature, the branch pipe 7 connected to the second exhaust port is closed, the liquid nitrogen supply is stopped, the fan 121 is reversed, the second cold circulation loop is opened, and the first cold circulation loop is closed;

[0065] First cooling cycle treatment:

[0066] When the temperature of the top of the cold storage material 22 in the cold recovery device 2 is higher than the temperature in the low temperature treatment device 1, the fan 121 rotates forward, the first cold circulation loop is opened, and the second cold circulation loop is closed;

[0067] Second cooling cycle treatment:

[0068] When the temperature at the bottom of the cold storage material 22 in the cold recovery device 2 is higher than the temperature in the low temperature treatment device 1, the fan 121 is reversed, the first cold circulation loop is closed, and the second cold circulation loop is opened;

[0069] The first cooling cycle treatment and the second cooling cycle treatment are performed alternately in sequence.

[0070] S1, initial cooling treatment:

[0071] After the liquid nitrogen input from the liquid nitrogen tank 123 is evenly dispersed by the disperser 122, the fan 121 rotates in a clockwise direction and blows from bottom to top to the inside of the deep cold box 11 to exchange heat with the material to be cooled 31. The liquid nitrogen absorbs the heat of the material to be cooled 31 and then vaporizes. The vaporized low-temperature nitrogen enters the cold storage box 21 through the first pipeline to exchange heat with the cold storage material 22. The low-temperature nitrogen stores the cold in the cold storage material 22, and its own temperature gradually increases. After reaching the preset temperature, it is discharged through the pressure relief valve 71 installed at the bottom of the cold storage box 21; at the same time, the temperature of the upper part of the cold storage material 22 gradually decreases, and the temperature is gradually increased from top to bottom, that is, the cold is mainly stored in the cold storage material 22 in the upper half. In this embodiment, the preset temperature is room temperature.

[0072] When the temperature of the middle part of the cold storage material 22 is lower than the room temperature, the pressure relief valve 71 at the bottom of the cold storage box 21 is closed, the liquid nitrogen supply of the liquid nitrogen tank 123 is stopped, and the direction of the fan 121 is changed to rotate in the counterclockwise direction. The low-temperature nitrogen flowing out from the bottom of the deep cold box 11 enters the cold storage box 21 through the third pipeline 63, and then passes through the cold storage material 22 from bottom to top for heat exchange. The low-temperature nitrogen is gradually heated by the cold storage material 22 with high temperature in the lower half, and the temperature gradually increases. The temperature in the middle position returns to high temperature, while the temperature of the cold storage material 22 at high temperature in the lower half gradually decreases. The nitrogen after returning to high temperature further exchanges heat with the low-temperature cold storage material 22 in the upper half, and the temperature gradually decreases. At this time, the temperature of the cold storage material 22 in the upper half gradually increases. After the nitrogen drops to the lowest temperature at the top of the cold storage material 22, it enters the deep cold box 11 through the fourth pipeline 64 to cool the material 31 to be treated, and then enters the bottom of the cold storage material 22 in the cold storage box 21 again, and circulates in sequence.

[0073] S2, first cooling cycle processing:

[0074] When the temperature at the top of the cold storage material 22 in the cold storage box 21 is higher than the temperature in the deep cold box 11, the direction of the fan 121 is changed to rotate in the clockwise direction. The low-temperature nitrogen flowing out from the top of the deep cold box 11 enters the cold storage box 21 through the first pipeline 61, and then exchanges heat with the cold storage material 22 from top to bottom. The low-temperature nitrogen is gradually heated by the high-temperature cold storage material 22 in the upper part, and the temperature gradually increases. The temperature returns to high temperature in the middle position, while the temperature of the cold storage material 22 at the high temperature in the upper part gradually decreases. The nitrogen that has returned to high temperature further exchanges heat with the low-temperature cold storage material 22 in the lower part, and the temperature gradually decreases. At this time, the temperature of the cold storage material 22 in the lower part gradually increases. After the nitrogen drops to the lowest temperature at the bottom of the cold storage material 22, it enters the deep cold box 11 through the second pipeline 62 to cool the material 31 to be treated, and then enters the top of the cold storage material 22 in the cold storage box 21 again, and circulates in sequence.

[0075] S3, second cooling cycle processing:

[0076] When the temperature at the bottom of the cold storage material 22 in the cold storage box 21 is higher than the temperature in the deep cold box 11, the direction of the fan 121 is changed to rotate in the counterclockwise direction. The low-temperature nitrogen flowing out from the bottom of the deep cold box 11 enters the cold storage box 21 through the third pipeline 63, and then exchanges heat with the cold storage material 22 from bottom to top. The low-temperature nitrogen is gradually heated by the cold storage material 22 with high temperature in the lower half, and the temperature gradually increases. The temperature reaches the highest state in the middle position, while the temperature of the cold storage material 22 at the lower half gradually decreases. The nitrogen after returning to high temperature further exchanges heat with the low-temperature cold storage material 22 in the upper half, and the temperature gradually decreases. At this time, the temperature of the cold storage material 22 in the upper half gradually increases. After the nitrogen drops to the lowest temperature at the top of the cold storage material 22, it enters the deep cold box 11 through the fourth pipeline 64 to cool the material 31 to be treated with cold, and then enters the bottom of the cold storage material 22 in the cold storage box 21 again, and circulates in sequence.

[0077] S4, step S2 and step S3 are continuously cycled, and during these two cycles, the supply of liquid nitrogen is stopped. The switching of each exhaust valve and the air inlet valve is an automatic process, and the controller automatically switches according to the temperature in the cryogenic box 11 measured by the first temperature detector 111 and the temperature relationship between the top and bottom of the cold storage material 22 measured by the second temperature detector 211.

[0078] After the material in the cryogenic box 11 is processed, it is sent out of the box through the automatic conveying device, and new materials are automatically added to the cryogenic box 11. During the entire automatic replacement and transmission process of the cold-treated material, the cryogenic box 11 remains closed throughout the process, and only the inlet and outlet of the material to be cold-treated 31 are left on the side of the cryogenic box 11 and insulation measures are taken, so there is almost no leakage of cold. At the same time, the automatic transmission and replacement process of the material does not interfere with the recovery and utilization process of the cold.

[0079] Considering that the low temperature system inevitably has heat leakage, after a long period of operation, if the low temperature cooling medium coming out of the cold recovery device 2 does not reach the preset temperature, a certain amount of liquid nitrogen will be added to the system to obtain a lower temperature. The cold energy of the low temperature nitrogen is continuously stored and utilized through the first cold energy cycle or the second cold energy cycle, which reduces the problem that the cold energy of the single-direction cold energy recovery device cannot be fully recovered, and the complex and high-cost operation during the recovery process.

[0080] When in use, the valve is not limited to be a stop valve, an electric valve, a solenoid valve or other types of valves that can be turned on and off.

[0081] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A deep cold continuous treatment and cold recovery system, characterized in that: The invention comprises a cryogenic treatment device, a cold recovery device and a material conveying device, wherein the first exhaust port of the cryogenic treatment device, the first air inlet of the cold recovery device, the second exhaust port of the cold recovery device and the second air inlet of the cryogenic treatment device are connected in sequence to form a first cold circulation loop; the third exhaust port of the cold recovery device, the third air inlet of the cryogenic treatment device, the fourth exhaust port of the cryogenic treatment device and the fourth air inlet of the cold recovery device are connected in sequence to form a second cold circulation loop, and the material conveying device passes through the cryogenic treatment device to convey the material to be cold-treated through the cryogenic treatment device; the cryogenic treatment device comprises a deep cold box and a cold supply component, the first exhaust port The first air inlet and the third air inlet are both located at the top of the cryogenic box, the second air inlet and the fourth air outlet are both located at the bottom of the cryogenic box, the cooling component is arranged in the cryogenic box, and is located on a side of the cryogenic box close to the second air inlet; the cold recovery device comprises a cold storage box and cold storage material filled in the cold storage box, the first air inlet and the third air outlet are both located at the top of the cold storage box, the second air outlet and the fourth air inlet are both located at the bottom of the cold storage box; the cooling component comprises a fan, a disperser and a liquid nitrogen tank, the liquid nitrogen tank is connected to the disperser, the fan and the disperser are both located in the cryogenic box, and the fan is located below the disperser.

2. The cryogenic continuous treatment and cold recovery system according to claim 1, characterized in that: The material conveying device passes through the cryogenic box and is located above the disperser.

3. The cryogenic continuous treatment and cold recovery system according to claim 1, characterized in that: A first temperature detector is provided at the top of the deep cold box, and a second temperature detector is provided at the top and bottom of the cold storage box.

4. The deep cold continuous treatment and cold recovery system according to any one of claims 1 to 3, characterized in that: A first exhaust valve is provided at the first exhaust port, a first intake valve is provided at the first intake port, a second exhaust valve is provided at the second exhaust port, and a second intake valve is provided at the second intake port.

5. The deep cold continuous treatment and cold recovery system according to claim 4, characterized in that: The third exhaust port is provided with a third exhaust valve, the third air inlet is provided with a third air inlet valve, the fourth exhaust port is provided with a fourth exhaust valve, and the fourth air inlet is provided with a fourth air inlet valve.

6. The deep cold continuous treatment and cold recovery system according to claim 4, characterized in that: A branch pipeline is provided on the pipeline communicating the second exhaust port and the second air inlet, and a pressure relief valve is provided on the branch pipeline.

7. A method for cryogenic continuous treatment and cold recovery using the cryogenic continuous treatment and cold recovery system according to any one of claims 1 to 6, characterized in that: include: Initial cooling treatment: The liquid nitrogen supply is turned on, the fan rotates forward, the second cooling circulation loop is closed, the connecting pipeline between the first exhaust port of the cryogenic treatment device of the first cooling circulation loop and the first air inlet of the cooling recovery device is opened, the connecting pipeline between the second exhaust port of the cooling recovery device and the second air inlet of the cryogenic treatment device is closed, and the branch pipeline connected to the second exhaust port is opened; When the temperature of the middle part of the cold storage material in the cold recovery device is lower than the preset temperature, the branch pipe connected to the second exhaust port is closed, the liquid nitrogen supply is stopped, the fan is reversed, the second cold circulation loop is opened, and the first cold circulation loop is closed; First cooling cycle treatment: When the temperature of the top of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan rotates forward, the first cold circulation loop is opened, and the second cold circulation loop is closed; Second cooling cycle treatment: When the temperature at the bottom of the cold storage material in the cold recovery device is higher than the temperature in the low temperature treatment device, the fan is reversed, the first cold circulation loop is closed, and the second cold circulation loop is opened; The first cooling cycle treatment and the second cooling cycle treatment are performed alternately in sequence.

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