Dual-mode material freeze-drying equipment and method based on CO2 refrigeration and hot water heating

Abstract

The dual-mode material freeze-drying equipment and method based on CO2 refrigeration and hot water heating have the advantages that a CO2 refrigeration circulation subsystem is additionally arranged, and a first pipe valve assembly and a second pipe valve assembly are arranged and used for being rapidly connected with a heat exchange channel of a contact type heat exchange plate of a movable skip car in a freeze-drying bin so as to control switching of a heat exchange medium; in the freezing mode, the CO2 refrigeration circulation subsystem and the heat exchange channel are communicated to freeze materials, in the drying mode, the hot water circulation subsystem and the heat exchange channel are communicated to dry the materials, and in the residue removal mode, the blowing device and the heat exchange channel are communicated to remove residual heat exchange media in the heat exchange channel and replace the residual heat exchange media with air; therefore, the materials can be frozen and dried in the freeze-drying bin, the related equipment cost, energy consumption and time required by freezing outside the bin are saved, the production benefit and efficiency are improved, and the problems of pollution and damage caused by freezing outside the bin are solved.

Description

Technical Field

[0001] The present invention relates to the field of freeze-drying technology, and in particular to a dual-mode material freeze-drying device and method based on CO2 refrigeration and hot water heating. Background Art

[0002] Freeze drying equipment, also known as vacuum freeze drying equipment, freezes food, medicine and other materials to below their eutectic point, turning the water in them into solid ice. Then, in a vacuum environment, the ice is directly sublimated into water vapor, and a water trap is used to condense the water vapor to finally dry the items.

[0003] Currently, large-scale freeze-drying equipment generally uses a separate operating mode, with off-site freezing and in-house drying. Specifically, the material must first be frozen to below the eutectic point in an external cold storage facility before being transferred to the freeze-drying chamber for vacuum drying on fixed heating plates. This operating mode presents the following problems: ① High equipment costs, requiring the construction of an additional cold storage facility and rail system, and high energy consumption. ② Complicated operation, requiring multiple material transfers, can easily lead to contamination or damage.

[0004] Therefore, there is an urgent need for a freeze-drying equipment with integrated refrigeration and heating functions to improve efficiency and reduce costs, reduce the number of transfers, and reduce the possibility of contamination and damage. Summary of the Invention

[0005] A technical problem to be solved by this application is to overcome the defects of the above-mentioned related technologies and provide a dual-mode material freeze-drying equipment and method based on CO2 refrigeration and hot water heating, which adopts a contact cold and heat transfer dual-mode switching method to freeze and dry the material in the freeze-drying chamber to reduce equipment costs, reduce the number of transfers, improve efficiency and reduce the possibility of pollution and damage.

[0006] The technical solution adopted by this dual-mode material freeze-drying equipment is: a dual-mode material freeze-drying equipment based on CO2 refrigeration and hot water heating, including: The hot water circulation subsystem is provided with a hot water outlet and a hot water inlet, and is used to pass circulating hot water into the heat exchange pipes on the contact heat exchange plates of the mobile material car through the heat exchange medium inlet and the heat exchange medium outlet; The blowing device is provided with an air outlet and an air inlet, and is used to remove and discharge the heat exchange medium in the heat exchange pipe through the heat exchange medium outlet and the heat exchange medium inlet and replace it with air; The CO2 refrigeration cycle subsystem is provided with a refrigerant outlet and a refrigerant inlet, and is used to introduce circulating liquid CO2 into the heat exchange pipe through the heat exchange medium inlet and the heat exchange medium outlet; a first pipe-valve assembly, wherein a first quick connector of the first pipe-valve assembly is disposed in the freeze-drying chamber and is detachably connected to the heat exchange medium inlet of the mobile material vehicle, the first pipe-valve assembly being connected to the refrigerant outlet, the hot water outlet, and the air inlet, respectively, and being configured to connect only the refrigerant outlet and the heat exchange medium inlet in the freezing mode, only the hot water outlet and the heat exchange medium inlet in the drying mode, and only the air inlet and the heat exchange medium inlet in the residue removal mode; The second pipe-valve assembly, the second quick connector of the second pipe-valve assembly is arranged in the freeze-drying chamber and is detachably connected to the heat exchange medium outlet of the mobile material cart, the second pipe-valve assembly is respectively connected to the refrigerant inlet, the hot water inlet and the air outlet, and is used to connect only the refrigerant inlet and the heat exchange medium outlet in the freezing mode, only the hot water inlet and the heat exchange medium outlet in the drying mode, and only the air outlet and the heat exchange medium outlet in the residue removal mode.

[0007] The technical solution adopted by the present material freeze-drying method to solve the technical problem is: a material freeze-drying method, based on the above-mentioned dual-mode material freeze-drying equipment, specifically includes the following steps: Preparation process: After the contact heat exchange plate of the mobile feed cart is fully loaded with the trays storing the materials, it is slid into the freeze-drying chamber. The heat exchange medium inlet of the mobile feed cart is quickly connected to the first quick connector of the dual-mode material freeze-drying equipment. The heat exchange medium outlet of the mobile feed cart is quickly connected to the second quick connector of the dual-mode material freeze-drying equipment. The freeze-drying chamber is sealed and vacuumed. Entering the freezing process: The dual-mode material freeze-drying equipment starts the freezing mode, the CO2 refrigeration cycle subsystem is turned on, and circulating liquid CO2 is introduced into the heat exchange pipe on the contact heat exchange plate for refrigeration to freeze the material. After the freezing is completed and the liquid CO2 is recovered, the dual-mode material freeze-drying equipment starts the residual mode, the blowing device is turned on, and the residual liquid CO2 in the heat exchange pipe is evaporated into gas, which is then cleaned and discharged by the blowing device and replaced with air; Entering the freeze-drying process: The dual-mode material freeze-drying equipment starts the drying mode, the hot water circulation subsystem is turned on, and circulating hot water is introduced into the heat exchange pipe on the contact heat exchange plate for heating to dry the material. After the drying is completed and the hot water is recovered, the dual-mode material freeze-drying equipment starts the residual mode, and the blowing device is turned on again. The residual hot water in the heat exchange pipe is cleaned and discharged by the blowing device and replaced with air.

[0008] Compared with the related art, the dual-mode material freeze-drying equipment and method have the following advantages: a CO2 refrigeration cycle subsystem is added to pass circulating liquid CO2 into the heat exchange pipe on the contact heat exchange plate of the mobile material vehicle through the heat exchange medium inlet and the heat exchange medium outlet, and a first pipe valve assembly and a second pipe valve assembly are provided to control the heat exchange medium passing through the heat exchange medium inlet and the heat exchange medium outlet to the heat exchange channel of the contact heat exchange plate of the mobile material vehicle, and to connect the CO2 refrigeration cycle subsystem and the heat exchange channel of the contact heat exchange plate of the mobile material vehicle in the freezing mode to cool the heat stored in the tray on the contact heat exchange plate. The material is placed in the freeze-drying chamber for freezing. In the drying mode, the hot water circulation subsystem is connected to the heat exchange channel of the contact heat exchange plate of the mobile material cart to dry the material stored in the tray on the contact heat exchange plate. In the residual removal mode, the blowing device is connected to the heat exchange channel of the contact heat exchange plate of the mobile material cart to remove the residual heat exchange medium in the heat exchange channel and replace it with air, so that the freezing and drying of the material can be completed in the freeze-drying chamber, saving the cost, energy consumption and time of related equipment such as cold storage required for freezing outside the warehouse, improving production benefits and efficiency, and eliminating the pollution and damage problems caused by freezing outside the warehouse.

[0009] Preferably, the CO2 refrigeration cycle subsystem of the dual-mode material freeze-drying equipment includes a high-pressure CO2 liquid storage tank, a first circulation pump and a recovery pump. The first circulation pump is connected to the cold source output pipeline between the high-pressure CO2 liquid storage tank and the refrigerant outlet, and the recovery pump is connected to the refrigerant inlet and the high-pressure CO2 liquid storage tank cold source return pipeline.

[0010] As an improvement, a condensing heat exchanger is installed between the recovery pump and the cold source return line of the high-pressure CO2 storage tank. Liquid CO2 absorbs heat in the heat exchange channel and partially evaporates. The condensing heat exchanger is used to liquefy the pressurized CO2 gas, thereby reducing CO2 loss and lowering operating costs.

[0011] As an improvement, the high-pressure CO2 storage tank and first circulation pump of this dual-mode material freeze-drying system are connected to the cold source supply pipeline of the freeze-drying chamber's cold trap, and the recovery pump is connected to the cold source recovery pipeline of the freeze-drying chamber's cold trap. Using the CO2 refrigeration circulation subsystem to simultaneously provide cold source to the freeze-drying chamber's cold trap can reduce the equipment cost of the entire freeze-drying system.

[0012] As an improvement, there are two condensing heat exchangers and they are arranged in parallel, which can increase the liquefaction speed of CO2 gas.

[0013] Preferably, the first pipe and valve assembly of the dual-mode material freeze-drying equipment includes a first three-way joint, a first switch valve, a second switch valve and a third switch valve, the first switch valve is arranged on the connecting pipe between the refrigerant outlet and the first three-way joint, the second switch valve is arranged on the connecting pipe between the hot water outlet and the first three-way joint, the first three-way joint is connected to the heat exchange medium inlet, and the third switch valve is connected to the connecting pipe between the second switch valve and the air inlet; The second pipe and valve assembly of the dual-mode material freeze-drying equipment includes a second three-way connector, a third three-way connector, a fourth on-off valve, a fifth on-off valve, and a sixth on-off valve. The fourth on-off valve is arranged on the connecting pipe between the refrigerant inlet and the second three-way connector, the fifth on-off valve is arranged on the connecting pipe between the hot water inlet and the second three-way connector, the third three-way connector is connected to the connecting pipe between the second three-way connector and the heat exchange medium outlet, and the sixth on-off valve is arranged on the connecting pipe between the air outlet and the third three-way connector. The multi-valve arrangement enables each subsystem to be maintained independently, reducing maintenance costs.

[0014] Preferably, the material freeze-drying method further includes a maintenance process: after freeze-drying is completed, the connection between the dual-mode material freeze-drying equipment and the mobile trolley is disconnected, the mobile trolley is moved out of the freeze-drying chamber along the slide rail, and the contact heat exchange plate is cleaned and repaired after the tray is emptied. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 This is a structural diagram of the dual-mode material freeze-drying equipment, freeze-drying chamber and mobile material cart of this application.

[0016] Figure 2 This is a schematic diagram of the operation of the freezing mode of the dual-mode material freeze-drying equipment of this application.

[0017] Figure 3 This is a schematic diagram of the operation of the drying mode of the dual-mode material freeze-drying equipment of this application.

[0018] Figure 4 This is a schematic diagram of the operation of the residual mode of the dual-mode material freeze-drying equipment of this application.

[0019] Figure 5 It is a three-dimensional schematic diagram of a mobile material cart. DETAILED DESCRIPTION

[0020] First, those skilled in the art should understand that these embodiments are merely used to explain the technical principles of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Those skilled in the art may adjust them as needed to suit specific application scenarios.

[0021] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0022] This preferred embodiment is a dual-mode material freeze-drying device based on CO2 refrigeration and hot water heating. The connection structure between the dual-mode material freeze-drying device and the freeze-drying chamber 100 and the mobile material vehicle 200 is as follows: Figure 1 Specifically including: The hot water circulation subsystem 1 is provided with a hot water outlet and a hot water inlet, and is used to pass circulating hot water into the heat exchange pipes on the contact heat exchange plate 201 of the mobile trolley 200 through the heat exchange medium inlet 211 and the heat exchange medium outlet 212; The blowing device 2 is provided with an air outlet and an air inlet, and is used to remove and discharge the heat exchange medium in the heat exchange pipe through the heat exchange medium outlet 212 and the heat exchange medium inlet 211 and replace it with air; The CO2 refrigeration cycle subsystem 3 is provided with a refrigerant outlet and a refrigerant inlet, and is used to introduce circulating liquid CO2 into the heat exchange pipe through the heat exchange medium inlet 211 and the heat exchange medium outlet 212; A first pipe-valve assembly 4, wherein a first quick connector of the first pipe-valve assembly 4 is disposed in the freeze-drying chamber 100 and is detachably connected to the heat exchange medium inlet 211 of the mobile trolley 200. The first pipe-valve assembly 4 is respectively connected to the refrigerant outlet, the hot water outlet, and the air inlet, and is used to connect only the refrigerant outlet and the heat exchange medium inlet 211 in the freezing mode, only the hot water outlet and the heat exchange medium inlet 211 in the drying mode, and only the air inlet and the heat exchange medium inlet 211 in the residue removal mode; The second pipe-valve assembly 5, the second quick connector of the second pipe-valve assembly 5 is arranged in the freeze-drying chamber 100 and is detachably connected to the heat exchange medium outlet 212 of the mobile material cart 200, the second pipe-valve assembly 5 is respectively connected to the refrigerant inlet, the hot water inlet and the air outlet, and is used to connect only the refrigerant inlet and the heat exchange medium outlet 212 in the freezing mode, only connect the hot water inlet and the heat exchange medium outlet 212 in the drying mode, and only connect the air outlet and the heat exchange medium outlet 212 in the residue removal mode.

[0023] Among them, the structure of the mobile trolley 200 is roughly the same as that of the heating trolley of CN115682645A, including an installation frame, on which a multi-layer contact heat exchange plate 201 is arranged, and the contact heat exchange plate 201 is provided with a heat exchange channel, which is connected to the heat exchange medium inlet 211 and the heat exchange medium outlet 212. Two sets of lifting pulley assemblies 202 are arranged on the top of the installation frame, and the lifting pulley assembly 202 is slidably connected to the slide rail 103 hoisted by the freeze-drying bin 100; the difference is that the contact heat exchange plate 201 of this mobile trolley 200 is made of materials with strong thermal conductivity, high and low temperature resistance, and high pressure resistance.

[0024] Among them, the hot water circulation subsystem 1 includes a hot water tank 11, a filter, a plate heat exchanger 12, a second circulation pump 13 and a pressure relief valve 14 and related switch valves and stop valves on the pipeline. The pressure relief valve 14 is connected to the hot water tank 11, and the hot water tank 11 is equipped with a heater that is connected to external steam.

[0025] Among them, the blowing device 2 adopts a high-pressure blower to increase the removal speed and ensure the removal effect.

[0026] Among them, the CO2 refrigeration cycle subsystem 3 includes a high-pressure CO2 storage tank 31, a first circulation pump 32, a recovery pump 33 and a condensing heat exchanger 34. The high-pressure CO2 storage tank 31 is used to store liquid CO2 of 1.5~1.8MPa. A reserved stop valve is connected to the high-pressure CO2 storage tank 31 for replenishing liquid CO2. The first circulation pump 32 is connected to the cold source output pipeline between the high-pressure CO2 storage tank 31 and the refrigerant outlet. The recovery pump 33 is connected to the refrigerant inlet and the cold source return pipeline of the high-pressure CO2 storage tank 31. The liquid CO2 absorbs the heat of the material through the heat exchange channel of the contact heat exchange plate 201 and is partially vaporized. After being compressed by the recovery pump 33, it is liquefied by the condensing heat exchanger 34 and returns to the high-pressure CO2 storage tank 31 to form a cycle. The high-pressure CO2 liquid storage tank 31 and the first circulation pump 32 are connected to the cold source supply pipeline of the cold trap of the freeze-drying chamber 100, and are used to supply cold to the two cold traps of the freeze-drying chamber 100 respectively. The recovery pump 33 and the condensing heat exchanger 34 are connected to the cold source recovery pipeline of the cold trap of the freeze-drying chamber 100, wherein there are two condensing heat exchangers 34 and they are arranged in parallel.

[0027] Among them, the first pipe-valve assembly 4 includes a first three-way joint 41, a first switch valve 42, a second switch valve 43 and a third switch valve 44, the first switch valve 42 is arranged on the connecting pipeline between the refrigerant outlet and the first three-way joint 41, the second switch valve 43 is arranged on the connecting pipeline between the hot water outlet and the first three-way joint 41, the first three-way joint 41 is connected to the heat exchange medium inlet 211, and the third switch valve 44 is connected to the connecting pipeline between the second switch valve 43 and the air inlet; the second pipe-valve assembly 5 includes a second three-way joint 51, a third three-way joint 52, a fourth switch valve 53, a fifth switch valve 54 and a sixth switch valve 55, the fourth switch valve 53 is arranged on the connecting pipeline between the refrigerant inlet and the second three-way joint 51, the fifth switch valve 54 is arranged on the connecting pipeline between the hot water inlet and the second three-way joint 51, the third three-way joint 52 is connected to the connecting pipeline between the second three-way joint 51 and the heat exchange medium outlet 212, and the sixth switch valve 55 is arranged on the connecting pipeline between the air outlet and the third three-way joint 52.

[0028] The method for freeze-drying materials using the dual-mode material freeze-drying equipment specifically includes the following steps: Preparation process: After the contact heat exchange plates 201 on each layer of the mobile trolley 200 are fully loaded with trays for storing materials, the mobile trolley 200 slides along the slide rails 103 into the freeze-drying chamber 100. The heat exchange medium inlet 211 of the mobile trolley 200 is quickly connected to the first quick connector of the dual-mode material freeze-drying equipment. The heat exchange medium outlet 212 of the mobile trolley 200 is quickly connected to the second quick connector of the dual-mode material freeze-drying equipment. The freeze-drying chamber 100 is sealed and vacuumed. Entering the freezing process: The dual-mode material freeze drying equipment starts the freezing mode, such as Figure 2 As shown, the first switch valve 42 and the fourth switch valve 53 are opened, the second switch valve 43, the third switch valve 44, the fifth switch valve 54 and the sixth switch valve 55 are closed, the CO2 refrigeration cycle subsystem 3 is turned on, the first circulation pump 32 is turned on, and circulating liquid CO2 is introduced into the heat exchange pipe on the contact heat exchange plate 201 for refrigeration to freeze the material. After the freezing is completed and the liquid CO2 is recovered, the first circulation pump 32 is turned off, and the dual-mode material freeze-drying equipment starts the residual removal mode, as shown in FIG. Figure 4 As shown, the second on-off valve 43, the third on-off valve 44 and the sixth on-off valve 55 are open, the first on-off valve 42, the fourth on-off valve 53 and the fifth on-off valve 54 are closed, and the blowing device 2 is turned on. The residual liquid CO2 in the heat exchange pipe evaporates into gas and is cleaned and discharged by the blowing device 2 to be replaced by the air above the hot water tank 11. When the pressure of the hot water tank 11 is too high, the pressure relief valve 14 is opened to communicate with the atmosphere; Enter the freeze-drying process: the dual-mode material freeze-drying equipment starts the drying mode, such as Figure 3 As shown, the second switch valve 43 and the fifth switch valve 54 are opened, the first switch valve 42, the third switch valve 44, the fourth switch valve 53 and the sixth switch valve 55 are closed, the hot water circulation subsystem 1 is turned on, and circulating hot water is introduced into the heat exchange pipe on the contact heat exchange plate 201 for heating to dry the material. After the drying is completed and the hot water is recovered, the dual-mode material freeze-drying equipment starts the residue removal mode, as shown in FIG. Figure 4 As shown, the second on-off valve 43, the third on-off valve 44 and the sixth on-off valve 55 are opened, the first on-off valve 42, the fourth on-off valve 53 and the fifth on-off valve 54 are closed, and the blowing device 2 is turned on again. The residual hot water in the heat exchange pipe is cleaned and discharged by the blowing device 2 and replaced with air; Maintenance process: After freeze-drying is completed, the first switch valve 42, the second switch valve 43, the third switch valve 44, the fourth switch valve 53, the fifth switch valve 54 and the sixth switch valve 55 are closed, the connection between the dual-mode material freeze-drying equipment and the mobile trolley 200 is disconnected, and the mobile trolley 200 is moved out of the freeze-drying chamber 100 along the slide rail 103. After the pallet is emptied, the contact heat exchange plate 201 is cleaned and repaired.

[0029] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A dual-mode material freeze-drying device based on CO2 refrigeration and hot water heating, comprising: The hot water circulation subsystem is provided with a hot water outlet and a hot water inlet, and is used to pass circulating hot water into the heat exchange pipes on the contact heat exchange plates of the mobile material car through the heat exchange medium inlet and the heat exchange medium outlet; The blowing device is provided with an air outlet and an air inlet, and is used to remove and discharge the heat exchange medium in the heat exchange pipe through the heat exchange medium outlet and the heat exchange medium inlet and replace it with air; It is characterized by further comprising: The CO2 refrigeration cycle subsystem is provided with a refrigerant outlet and a refrigerant inlet, and is used to introduce circulating liquid CO2 into the heat exchange pipe through the heat exchange medium inlet and the heat exchange medium outlet; a first pipe-valve assembly, wherein a first quick connector of the first pipe-valve assembly is disposed in the freeze-drying chamber and is detachably connected to the heat exchange medium inlet of the mobile material vehicle, the first pipe-valve assembly being connected to the refrigerant outlet, the hot water outlet, and the air inlet, respectively, and being configured to connect only the refrigerant outlet and the heat exchange medium inlet in the freezing mode, only the hot water outlet and the heat exchange medium inlet in the drying mode, and only the air inlet and the heat exchange medium inlet in the residue removal mode; The second pipe-valve assembly, the second quick connector of the second pipe-valve assembly is arranged in the freeze-drying chamber and is detachably connected to the heat exchange medium outlet of the mobile material cart, the second pipe-valve assembly is respectively connected to the refrigerant inlet, the hot water inlet and the air outlet, and is used to connect only the refrigerant inlet and the heat exchange medium outlet in the freezing mode, only the hot water inlet and the heat exchange medium outlet in the drying mode, and only the air outlet and the heat exchange medium outlet in the residue removal mode.

2. A dual-mode material freeze-drying equipment based on CO2 refrigeration and hot water heating according to claim 1, characterized in that: The CO2 refrigeration cycle subsystem includes a high-pressure CO2 liquid storage tank, a first circulation pump and a recovery pump. The first circulation pump is connected to the cold source output pipeline between the high-pressure CO2 liquid storage tank and the refrigerant outlet, and the recovery pump is connected to the refrigerant inlet and the high-pressure CO2 liquid storage tank cold source return pipeline.

3. The dual-mode material freeze-drying equipment based on CO2 refrigeration and hot water heating according to claim 2 is characterized in that: A condensing heat exchanger is provided on the cold source return pipeline between the recovery pump and the high-pressure CO2 storage tank.

4. The dual-mode material freeze-drying equipment based on CO2 refrigeration and hot water heating according to claim 3 is characterized in that: The high-pressure CO2 storage tank and the first circulation pump are connected to the cold source supply pipeline of the cold trap of the freeze-drying chamber, and the recovery pump and the condensing heat exchanger are connected to the cold source recovery pipeline of the cold trap of the freeze-drying chamber.

5. The dual-mode material freeze-drying equipment based on CO2 refrigeration and hot water heating according to claim 4 is characterized in that: There are two condensing heat exchangers which are arranged in parallel.

6. A dual-mode material freeze-drying device based on CO2 refrigeration and hot water heating according to any one of claims 1 to 5, characterized in that: The first pipe and valve assembly includes a first three-way joint, a first on-off valve, a second on-off valve, and a third on-off valve, wherein the first on-off valve is arranged on the connecting pipe between the refrigerant outlet and the first three-way joint, the second on-off valve is arranged on the connecting pipe between the hot water outlet and the first three-way joint, the first three-way joint is connected to the heat exchange medium inlet, and the third on-off valve is connected to the connecting pipe between the second on-off valve and the air inlet; The second pipe and valve assembly includes a second three-way joint, a third three-way joint, a fourth switch valve, a fifth switch valve and a sixth switch valve. The fourth switch valve is arranged on the connecting pipe between the refrigerant inlet and the second three-way joint, the fifth switch valve is arranged on the connecting pipe between the hot water inlet and the second three-way joint, the third three-way joint is connected to the connecting pipe between the second three-way joint and the heat exchange medium outlet, and the sixth switch valve is arranged on the connecting pipe between the air outlet and the third three-way joint.

7. A material freeze-drying method, based on the dual-mode material freeze-drying equipment according to any one of claims 1 to 6, characterized in that: The specific steps include: Preparation process: After the contact heat exchange plate of the mobile feed cart is fully loaded with the trays storing the materials, it is slid into the freeze-drying chamber. The heat exchange medium inlet of the mobile feed cart is quickly connected to the first quick connector of the dual-mode material freeze-drying equipment. The heat exchange medium outlet of the mobile feed cart is quickly connected to the second quick connector of the dual-mode material freeze-drying equipment. The freeze-drying chamber is sealed and vacuumed. Entering the freezing process: The dual-mode material freeze-drying equipment starts the freezing mode, the CO2 refrigeration cycle subsystem is turned on, and circulating liquid CO2 is introduced into the heat exchange pipe on the contact heat exchange plate for refrigeration to freeze the material. After the freezing is completed and the liquid CO2 is recovered, the dual-mode material freeze-drying equipment starts the residual mode, the blowing device is turned on, and the residual liquid CO2 in the heat exchange pipe is evaporated into gas, which is then cleaned and discharged by the blowing device and replaced with air; Entering the freeze-drying process: The dual-mode material freeze-drying equipment starts the drying mode, the hot water circulation subsystem is turned on, and circulating hot water is introduced into the heat exchange pipe on the contact heat exchange plate for heating to dry the material. After the drying is completed and the hot water is recovered, the dual-mode material freeze-drying equipment starts the residual mode, and the blowing device is turned on again. The residual hot water in the heat exchange pipe is cleaned and discharged by the blowing device and replaced with air.

8. A freeze-drying method for materials according to claim 7, characterized in that: Also includes: Maintenance process: After freeze-drying is completed, disconnect the dual-mode material freeze-drying equipment from the mobile material cart, move the mobile material cart out of the freeze-drying chamber along the slide rail, and clean and inspect the contact heat exchange plate after the tray is emptied.

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