A freezing concentration device

Abstract

The present invention belongs to the field of freeze concentration technology, and relates to a freeze concentration device, including a freeze-thaw assembly, the freeze-thaw assembly including a container, a container cover, a heat-insulating cover at the bottom of the container, a hollow plate with an opening at the upper or lower end for setting a heat source, and a heat source arranged at the bottom of the container; the hollow plate arranged at the bottom of the container divides the container into two rectangular grooves. The device of the present invention solves the problem that during the freeze concentration process, the temperature of the heat source of the heater will be reduced to the freezing temperature, so that the temperature of the heat source itself cannot be met when the heater starts working, and the low temperature tolerance limit of the heat source of the heater affects the freezing low temperature that the final freeze concentration can withstand, thereby limiting the maximum concentration concentration of the freeze concentration of the device. The present invention improves the effect and efficiency of freeze concentration and separation and purification, and the equipment and operation are simple, which is convenient for application in the fields of food, cosmetics, biomedicine, environmental protection treatment, etc.

Description

Technical Field

[0001] The invention belongs to the technical field of freeze concentration, and in particular relates to a freeze concentration device. Background Art

[0002] Among the existing freeze concentration methods, there are mainly two types of freeze concentration methods with two different physical principles. The first type: a concentration technology that uses the solid-liquid phase relationship of a substance below the crystallization point (such as using an aqueous solution at the freezing point); for example, when the solvent is water, the concentration is achieved by freezing the water into ice crystals and removing the solvent (water) in a solid form through solid-liquid separation (separation of ice crystals from concentrated solution). The second type: a technical method for freeze concentration that uses the negative correlation between the melting point and the solute content (concentration); that is, a method of heating and dissolving the frozen material and collecting dissolved solutions of different concentrations to achieve a concentrated freeze concentration method.

[0003] The first freeze concentration method is a concentration technology that uses the solid-liquid phase relationship between a dilute solution and ice below the freezing point. There are two main methods: suspended crystallization freeze concentration and progressive freeze concentration. The principle of the suspended crystallization freeze concentration method is that when a dilute solution is frozen, the free small ice crystals suspended in the liquid are continuously removed to increase the liquid concentration. The principle of the progressive freeze concentration method is that when a dilute solution is frozen, as the ice layer is generated and grows on the cooling surface, the solute near the solid-liquid interface is removed to the liquid phase side, resulting in a concentration method in which the mass concentration of the solute in the liquid phase gradually increases. The existing freeze concentration methods have complex equipment structures, high equipment costs and production costs, and low efficiency.

[0004] The second freeze concentration method: using the negative correlation between melting point and solute content (concentration), concentration is achieved by heating, dissolving and separating the frozen material. For example, when ice melts naturally, a relatively high concentration solution will be dissolved first. Using this phenomenon, the concentration of the dilute solution can be increased by freezing the solution into a solid and then dissolving it multiple times. This is a freeze concentration method using the natural dissolution of ice. In addition, the natural dissolution of ice is a way of dissolving by heat. Similarly, heating and dissolving ice in other ways will also produce a concentrated solution, achieving freeze concentration. At present, the concentration effect and efficiency of this method are very low.

[0005] The above two freeze concentration methods based on different physical principles both have a major problem: low freeze concentration effect and efficiency. In particular, the existing freeze concentration method of heating and dissolving (traditional conventional heating method) has a lower concentration effect and efficiency than the existing method of using the solid-liquid phase relationship of the substance below the crystallization point (such as using the aqueous solution at the freezing point) to achieve concentration.

[0006] The reason that affects the concentration effect and efficiency of the first freeze concentration method is that the physical principle it adopts inevitably leads to the problem of solute entrainment during solid-liquid separation. The separation effect of ice crystals and the control of solute loss caused by ice crystal entrainment are extremely important for the successful application of freeze concentration under this physical principle, which is also one of the reasons for the complex structure, high equipment cost and complex operation of existing freeze concentration equipment.

[0007] The second freeze concentration method can solve the solute entrainment problem of the first method, but there are factors that affect the concentration effect and efficiency of the second freeze concentration method: factors such as the dense ice layer of the solute content on the cooling surface of the frozen material and the solid structure inside the frozen material will hinder the heat transfer when it is heated and dissolved, as well as the separation and outflow of the dissolved solution of the frozen material. These two hindering factors seriously affect the concentration effect and efficiency of the freeze concentration under this method.

[0008] The device disclosed in the public document (application number CN202411098559.2) breaks the above-mentioned conventional heating thinking by setting the heat source in a specific position. The heat source in a specific position solves the problem that the dense ice layer of the solute content on the cooling surface of the frozen material will hinder the heat transfer when it is heated and dissolved.

[0009] However, due to the negative correlation between the melting point and the solute content (concentration), many solutions have very low melting points when they reach a certain concentration. In other words, extremely low temperatures are required to freeze the solution at this concentration into a solid state. Figure 1 It is a curve diagram of the relationship between alcohol concentration and its melting point (freezing point). For example, when the alcohol concentration is about 70wt%, the melting point is below -50℃ (that is, the temperature when the solution is frozen into a solid state is below -50℃), and when the alcohol concentration is about 90wt%, the melting point is below -100℃ (that is, the temperature when the solution is frozen into a solid state is below -100℃). However, under normal circumstances, the heat source of the heater (heating element or heat medium) has a limited tolerance to low temperatures. If the low temperature limit is exceeded, the heater will be damaged and unable to work. At the same time, the heat source of the heater needs to meet a certain temperature before it can start working and transfer heat. If the freeze-concentration device with its own heater does not take protective measures for the heater during the freezing process, or if, as in the freeze-concentration device in the public document (application number CN202411098559.2): the heater and the dilute solution are frozen together in the freezing equipment, on the one hand, the temperature of the heat source of the heater will drop to the freezing temperature, which will cause the temperature of the heat source itself to fail to meet the requirements when the heater starts working; on the other hand, the low temperature tolerance limit of the heat source in the heater determines the final freezing low temperature that the freeze-concentration equipment can adopt, which limits the maximum concentration that can be achieved by the device during freeze-concentration, and ultimately affects the effect and efficiency of freeze-concentration. Summary of the invention

[0010] In order to solve the problems existing in the prior art, the main purpose of the present invention is to propose a technical concept of heat source installation: through the technical concept of separating or combining the heat source installation and the freezing process (determined by the depth of the freezing low temperature and the tolerance of the heat source).

[0011] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0012] A freezing concentration device, comprising:

[0013] The freeze-thaw assembly comprises a container, a container cover, a heat-insulating cover on the bottom of the container, a hollow plate with an opening at the upper or lower end for setting a heat source and arranged at the bottom of the container; the hollow plate arranged at the bottom of the container divides the container into two rectangular grooves;

[0014] During freezing, the dilute solution in the container is frozen into a solid or a solid-liquid mixture; then the container is removed from the freezing equipment, and a heat source is set in the hollow plate, and the heat source is used to transfer heat to the solid or solid-liquid mixture for dissolution, and the solution is retained in sections. The solution that meets the target concentration is retained for use, and the solution that does not meet the target concentration is continued to be frozen and dissolved using the freeze concentration device to achieve concentration of the dilute solution.

[0015] As a preferred embodiment of the freeze concentration device of the present invention, when freezing a dilute solution, the freezing method will affect the effect and efficiency of freeze concentration. For example, the effect and efficiency of freeze concentration are different under the gradual freezing method and the rapid freezing method; the gradual freezing method will improve the effect and efficiency of freeze concentration.

[0016] As a preferred embodiment of the freezing concentration device described in the present invention, the heat source is independently or detachably arranged on the lower end surface of the container cover or the upper end surface of the container bottom insulation cover.

[0017] As a preferred embodiment of the freeze concentration device described in the present invention, the heat source may be a heating element (such as an electric heating element, etc.), or a heat medium (such as a fluid, etc.) may be used as the heat source.

[0018] As a preferred embodiment of the freeze concentration device described in the present invention, the heat source is installed in the hollow plate before or after freezing to ensure normal use of the heat source under various freezing temperature conditions, including extremely low temperatures.

[0019] As a preferred embodiment of the freezing concentration device described in the present invention, the hollow plate is arranged at the center axis position of the container and its vicinity.

[0020] As a preferred embodiment of the freezing concentration device described in the present invention, a heat-insulating layer is provided on the side wall of the container perpendicular to the hollow plate.

[0021] As a preferred embodiment of the freezing concentration device described in the present invention, the device further comprises a heat insulation device for being mounted outside the container to achieve heat insulation.

[0022] As a preferred embodiment of the freeze concentration device described in the present invention, the device further comprises a device for manufacturing a flow guide channel, which is used to manufacture the flow guide channel on the solid or solid-liquid mixture obtained by freezing.

[0023] As a preferred embodiment of the freezing concentration device described in the present invention, the container cover is provided with a solution outlet and a solution outlet valve, and the container cover is also provided with legs for supporting the container during heating and dissolving.

[0024] As a preferred embodiment of a freezing concentration device described in the present invention, the container cover of the container is provided with an insulating layer; when the opening of the hollow plate is arranged at the lower end, the container bottom insulating cover of the container is also a protective cover of the opening of the hollow plate; when the opening of the hollow plate is arranged at the upper end, a protective cover of the opening and a spare cover of the container opening are arranged on the opening, which are respectively installed on the opening of the hollow plate and the opening of the container during freezing.

[0025] As a preferred embodiment of the freeze concentration device of the present invention, the freeze concentration device comprises a freeze-thaw component assembly composed of a plurality of freeze-thaw components. Compared with a single freeze-thaw component, such a freeze-thaw component assembly can improve the effect and efficiency of the freeze concentration device.

[0026] As a preferred embodiment of the freezing concentration device described in the present invention, when a heat medium is used as a heat source, a pipe for the heat medium to pass through is arranged in the hollow plate, or the inner space of the hollow plate is directly used as a channel for the heat medium.

[0027] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0028] An application of the above-mentioned freezing concentration device in the fields of food, cosmetics, biomedicine, environmental protection treatment, etc.

[0029] The above-mentioned freezing concentration device is used in the fields of milk, wine, beverages (such as juice, coffee, tea, soy milk, soy milk, etc.), chemical liquid, Chinese herbal medicine liquid, plant extract, seawater purification, wastewater treatment, etc.

[0030] An application of the above-mentioned freezing concentration device in the field of freezing concentration and separation and purification of heat-sensitive raw materials.

[0031] The above-mentioned freezing concentration device is used in the fields of freezing concentration and separation and purification of milk, wine, beverages (such as juice, coffee, tea, soy milk, soy milk, etc.), chemical liquid, Chinese herbal medicine liquid, plant extract, seawater purification, wastewater treatment, etc.

[0032] The beneficial effects of the present invention are as follows:

[0033] The present invention proposes a freezing concentration device, including a freezing and thawing component, the freezing and thawing component includes a container, a container cover, a heat-insulating cover at the bottom of the container, a hollow plate with an opening at the upper or lower end for setting a heat source, and a heat source; the hollow plate at the bottom of the container divides the container into two rectangular grooves; during freezing, the dilute solution in the container is frozen into a solid or a solid-liquid mixture; then the container is removed from the freezing equipment, the solid or solid-liquid mixture is heated and dissolved by the heat source, and the solution is retained in sections, and the solution that meets the target concentration is retained for standby use, and the solution that does not meet the target concentration is continued to be frozen and dissolved using the freezing concentration device to achieve the concentration of the dilute solution. The device of the present invention solves the problems that, during the freezing and concentration process, on the one hand, the temperature of the heat source (heating element or heat medium) of the heater will drop to the freezing temperature, which causes the temperature of the heat source itself of the heater to be unable to meet the requirements when starting the work; on the other hand, due to the low temperature tolerance limit of the heat source of the heater, the freezing low temperature that can be tolerated by the final freezing concentration is affected, thereby limiting the maximum concentration concentration of the freezing concentration of the device. The invention improves the effect and efficiency of freeze concentration and separation and purification, has simple equipment and operation, and is convenient for application in the fields of food, cosmetics, biomedicine, environmental protection treatment, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] 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 preferred embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0035] Figure 1 This is a curve chart showing the relationship between the concentration of alcohol and its melting point (freezing point).

[0036] Figure 2 It is a schematic diagram of the overall structure of the freeze-thaw assembly of the present invention.

[0037] Figure 3 It is a schematic cross-sectional view of a freeze-thaw assembly of the present invention provided with a hollow plate with an opening at the lower end.

[0038] Figure 4 It is a schematic cross-sectional view of the heat source of the present invention when it is arranged on the heat insulating cover at the bottom of the container.

[0039] Figure 5 The figure is a schematic diagram of the cross-sectional structure of a freezing concentration device of the present invention.

[0040] Figure 6 It is a schematic cross-sectional view of a freeze-thaw assembly of the present invention provided with a hollow plate with an upper opening.

[0041] Figure 7 It is a schematic cross-sectional view of the heat source of the present invention when it is arranged on the container cover.

[0042] Figure 8 It is a schematic diagram of the cross-sectional structure of another freezing concentration device of the present invention.

[0043] Fig. 9 It is a schematic diagram of the structure in which multiple freezing and thawing components of the present invention are combined together.

[0044] Fig.10 This is a schematic diagram of the heat source structure when a heat source medium is used as the heat source.

[0045] In the figure, 1-solution outlet valve, 2-solution outlet, 3-container cover, 4-hollow plate, 5, 6-container side wall, 7, 8-insulation layer, 9, 10-rectangular groove, 11-ice support rack, 12-container bottom, 13-opening, 14-protective cover, 15-container bottom insulation cover, 17-heat source, 18-power socket, 19-temperature adjustment switch, 20-protective cover, 21-heat source fixing frame, 22-container group cover, 23-container group, 24-container group bottom insulation cover, 25-spare cover, 26-heat source medium pipeline, 27-heat source medium outlet, 28-heat source medium inlet, 29-support foot.

[0046] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0047] The following will be described clearly and completely in conjunction with the technical solutions in the embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0048] Example 1

[0049] A freeze concentration device, such as Figure 2-5 As shown, it includes: a freeze-thaw assembly, which includes a container, a container cover 3, a container bottom insulation cover 15, a hollow plate 4 with an opening 13 at the lower end for setting a heat source 17 and arranged at the bottom 12 of the container, and a heat source 17; the hollow plate 4 arranged at the bottom 12 of the container divides the container into two rectangular grooves;

[0050] The container cover 3 of the container is provided with a heat insulation layer; the container cover 3 is also provided with an ice support rack 11 .

[0051] The heat-insulating cover 15 at the bottom of the container provided with a heat source is provided with a power socket 18 , a power line is connected to the power socket 18 , a temperature adjustment switch 19 is provided on the power socket 18 , and a protective cover 20 is provided on the power socket 18 .

[0052] In this embodiment, the hollow plate 4 is arranged at the center axis position of the container and its vicinity.

[0053] In this embodiment, the side walls of the container perpendicular to the hollow plate 4 are provided with heat-insulating layers 7, 8, and the hollow plate 4 is parallel to the side walls 5, 6 of the container.

[0054] In this embodiment, the device further comprises a heat insulating device for being mounted outside the freezing and thawing component to achieve heat insulation.

[0055] In this embodiment, the device further comprises a device for manufacturing a guide channel, which is used to make the guide channel on the solid or solid-liquid mixture obtained by freezing.

[0056] Specific operation: After injecting the dilute solution into the container, fasten the container cover 3 of the container and keep the container cover 3 facing upwards, install the container bottom insulation cover 15, and then put the container into the freezing equipment for freezing. After the dilute solution is frozen into a solid or a solid-liquid mixture, move the container out of the freezing equipment. Then, remove the container bottom insulation cover 15, and use the opening 13 to install the heat source 17 into the hollow plate 4 (including installing the heat source 17 into the hollow plate 4 separately and then installing the container bottom insulation cover 15 on the container bottom 12 to achieve the connection between the heat source 17 and the container bottom insulation cover 15; or installing the heat source 17 on the container bottom insulation cover 15 and then installing the container bottom insulation cover 15 on the container bottom 12; or installing the container bottom insulation cover provided with the heat source 17 on the container bottom 12). The container is turned over so that the container cover 3 is at the bottom, and the container is placed by the support legs 29. Then, the power supply is connected through the power socket 18, and the working temperature of the heat source 17 is set. The heat source 17 transfers heat to the solid or solid-liquid mixture to dissolve it. The solution falls through the ice support rack 11 and flows out through the solution outlet 2. The solution is retained in sections by opening and closing the solution outlet valve 1 to obtain solutions of different concentrations. The solution that meets the target concentration is transferred to the next link for storage (or use), and the solution that does not meet the target concentration can be frozen and dissolved again by the freeze concentration device to continue to increase the solution concentration.

[0057] In this embodiment, the heat source 17 may be a heating element (such as an electric heating element, etc.), or a heat medium (such as a fluid, etc.) may be used as the heat source 17. The heat source 17 may be a plate-shaped heat source or a plurality of parallel rod-shaped heat sources.

[0058] Example 2

[0059] like Figure 6-8 As shown, a freeze concentration device is different from Example 1 in that in the freeze-thaw assembly, a hollow plate 4 for mounting a heat source 17 is provided at the bottom 12 of the container, and its opening 13 is provided at the upper end of the hollow plate 4. The heat source 17 is mounted on a heat source fixing frame 21 on the lower end surface of the container cover 3. The heat source fixing frame 21 serves as a bracket for fixing the heat source 17 and also has the function of serving as an ice support. A container standby cover 25 and a protective cover 14 for the opening 13 are also provided.

[0060] Specific operation: Cover the opening 13 with the protective cover 14, inject the dilute solution into the container, fasten the spare cover 25 and the container bottom insulation cover 15, keep the spare cover 25 facing upward, and put the container into the freezing equipment for freezing. After the dilute solution is frozen into a solid or a solid-liquid mixture, move the container out of the freezer or refrigerator freezer. Then, remove the spare cover 25 and the opening protective cover 14, cover the container cover 3 on the container and fasten it, and the heat source 17 set on the container cover 3 is installed into the hollow plate 4. Turn the container so that the container cover 3 is at the bottom, place the container through the support feet 29, connect the power supply through the power socket 18, set the working temperature of the heat source 17, and the heat source 17 transfers heat to the solid or solid-liquid mixture to dissolve it. The solution flows out through the solution outlet 2, and the solution is retained in sections by opening and closing the solution outlet valve 1 to obtain solutions of different concentrations. The solution that meets the target concentration is transferred to the next link for storage (or utilization), and the solution that does not meet the target concentration can be frozen and dissolved again through the freezing concentration device to continue to increase the solution concentration.

[0061] Example 3

[0062] like Figure 9-10 As shown, a freeze concentration device is different from Example 1 in that it is a freeze thawing assembly composed of several freeze thawing assemblies in Example 1 or Example 2. The freeze thawing assembly includes: a container assembly cover 22, a container assembly 23, and a container assembly bottom insulation cover 24. Other operation methods and steps are basically similar to Example 1.

[0063] like Fig.10 , which is a schematic diagram of the heat source assembly structure when a heat source medium is used as a heat source, includes a heat source medium pipeline 26 , a heat source medium inlet 28 , and a heat source medium outlet 27 .

[0064] In this embodiment, the freeze-thaw component assembly adopts a mode in which multiple groups of freeze-thaw components are combined together, which can improve the effect and efficiency of the freeze concentration device.

[0065] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification under the inventive concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A freeze concentration device, characterized in that: include: The invention comprises a freeze-thaw assembly, which comprises a container, a container cover, a heat-insulating cover at the bottom of the container, a hollow plate with an opening at the upper or lower end for setting a heat source and arranged at the bottom of the container; the hollow plate arranged at the bottom of the container divides the container into two rectangular grooves; the heat source is installed in the hollow plate after freezing; During freezing, the dilute solution in the container is frozen into a solid or a solid-liquid mixture; then the container is removed from the freezing equipment, and heat is transferred to the solid or solid-liquid mixture by a heat source to dissolve it, and the solution is retained in sections. The solution that meets the target concentration is retained for later use, and the solution that does not meet the target concentration is continued to be frozen and dissolved using the freeze concentration device to achieve concentration of the dilute solution.

2. The freeze concentration device according to claim 1, characterized in that: The heat source is independently or detachably arranged on the lower end surface of the container cover or the upper end surface of the container bottom insulation cover, and is a heating element or uses a heat medium as a heat source.

3. The freeze concentration device according to claim 1, characterized in that: The hollow plate is arranged at the center line position of the container and its vicinity.

4. The freeze concentration device according to claim 1, characterized in that: The device also includes a heat insulation device, which is used for being sleeved outside the container to achieve heat insulation.

5. The freeze concentration device according to claim 1, characterized in that: The container cover of the container is provided with a solution outlet and a solution outlet valve, and the container cover of the container is also provided with supporting feet for supporting the container during heating and dissolving.

6. The freeze concentration device according to claim 1, characterized in that: The container cover of the container is provided with an insulation layer; when the opening of the hollow plate is arranged at the lower end, the container bottom insulation cover of the container is also the protective cover of the opening of the hollow plate; when the opening of the hollow plate is arranged at the upper end, a protective cover of the opening and a spare cover of the container opening are arranged on the opening, which are respectively installed on the opening of the hollow plate and the opening of the container during freezing.

7. The freeze concentration device according to claim 1, characterized in that: The freeze concentration device comprises a freeze-thaw component assembly in which a plurality of groups of the freeze-thaw components are assembled together.

8. The freeze concentration device according to claim 2, characterized in that: When a heat medium is used as a heat source, a pipe for the heat medium to pass through is arranged in the hollow plate, or the inner space of the hollow plate is directly used as a channel for the heat medium.

9. Application of the freezing concentration device according to any one of claims 1 to 8 in the fields of food, cosmetics, biomedicine, and environmental protection treatment.

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