A freezing concentration device

Abstract

The present invention belongs to the technical field of freeze concentration, and relates to a freeze concentration device, including a freeze-thaw component, a dilute solution is frozen into a solid or solid-liquid mixture in the freeze-thaw component, and the surface solid layer in the solution separation outflow direction when heated and dissolved does not form a dense solid layer, or the density of the surface solid layer in the solution separation outflow direction is smaller than the density of the surface solid layer in other directions; the solution outlet of the freeze-thaw component is arranged on: the container surface where the dissolved solution is easier to separate and flow out. The solid or solid-liquid mixture is heated and dissolved, and the solution is retained in sections. The solution that meets the target concentration is retained for standby use, and the solution that does not meet the target concentration is continuously frozen and dissolved using the freeze concentration device to achieve the concentration of the dilute solution. The present invention improves the 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 type of freeze concentration method: 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: when freezing a dilute solution, 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: when freezing a dilute solution, as the ice layer is generated and grows on the cooling surface, the solute near the solid-liquid interface is excluded 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 type of 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 through 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 have a major problem: the correlation and efficiency of freeze concentration are low. 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 leads to the inevitable solute entrainment problem 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. However, there are factors that affect the concentration effect and efficiency of the second freeze concentration method: factors such as the ice layer 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. Summary of the invention

[0008] In order to solve the problems existing in the prior art, the main purpose of the present invention is to provide a freezing concentration device.

[0009] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions:

[0010] A freeze concentration device, comprising: a freeze-thaw component;

[0011] The dilute solution is frozen into a solid or a solid-liquid mixture in the freezing and dissolving assembly, so that when the solid or solid-liquid mixture is heated and dissolved, the surface solid layer in the solution separation outflow direction does not form a dense solid layer, or the density of the surface solid layer in the solution separation outflow direction is smaller than the density of the surface solid layer in other directions;

[0012] The solid or solid-liquid mixture is heated and dissolved, and the solution is retained in stages. The solution that meets the target concentration is retained for use, and the solution that does not meet the target concentration is further frozen and dissolved using the freezing concentration device to achieve concentration of the dilute solution.

[0013] As a preferred embodiment of the freeze concentration device described in the present invention, when a solid or a solid-liquid mixture is heated and dissolved, the direction of solution separation and outflow is determined according to the internal structural characteristics of the dilute solution after it is frozen into a solid or a solid-liquid mixture, that is, the direction that makes it easier for the solution to be separated and outflowed is set as the direction of solution separation and outflow when the solid or the solid-liquid mixture is heated and dissolved.

[0014] As a preferred embodiment of the freeze concentration device described in the present invention, the dilute solution is frozen into a solid or a solid-liquid mixture in the freeze-thaw component, and the solute distribution inside the solid or solid-liquid mixture is also related to the freezing rate, shape and volume of the container during freezing.

[0015] As a preferred embodiment of a freeze concentration device described in the present invention, the thermal conductivity of the material of the container portion (e.g., container surface) in the solution outflow direction of the freeze-thaw component is smaller than that of other surfaces, and insulation measures are taken for the container portion (e.g., container surface), so that when the dilute solution is frozen into a solid or a solid-liquid mixture in the freeze-thaw component, the following can be achieved: when the solid or the solid-liquid mixture is heated and dissolved, the solution separation outflow direction is determined according to the internal structural characteristics of the dilute solution after being frozen into the solid or the solid-liquid mixture, that is, the direction that makes it easier for the solution to be separated and outflowed is set as the solution separation outflow direction when the solid or the solid-liquid mixture is heated and dissolved.

[0016] As a preferred embodiment of a freeze concentration device described in the present invention, the dilute solution is frozen into a solid or a solid-liquid mixture in the freeze-thaw component, and the internal solid structure characteristics are related to the cooling surface during the freezing process; the solution separation and outflow direction of the freeze-thaw component can be determined according to the position of the cooling surface when the dilute solution is frozen, that is, the solution separation and outflow outlet is set according to the internal solid structure characteristics of the dilute solution after it is frozen into a solid or a solid-liquid mixture in the device: the solution outlet of the device is set at the container part (for example, the container surface) where the internal solid structure makes it easier for the solution to be separated and the outflow direction indicated.

[0017] As a preferred embodiment of the freeze concentration device described in the present invention, the solution outlet of the freeze-thaw component is set at the bottom of the freeze-thaw component, or the entire bottom is designed as an openable lid, so that the bottom of the entire freeze-thaw component serves as the solution outlet, which will improve the effect and efficiency of freeze concentration.

[0018] As a preferred embodiment of the freeze concentration device of the present invention, the method of heating and dissolving the solid or solid-liquid mixture is:

[0019] Solids or solid-liquid mixtures naturally dissolve,

[0020] or directly transferring heat to a solid or a solid-liquid mixture, wherein one or more heat sources for transferring heat to the ice body may be provided;

[0021] Or a heat source is arranged at a specific position inside or outside the solid or solid-liquid mixture to transfer heat to it, wherein one or more heat sources can be arranged to transfer heat to the ice body.

[0022] As a preferred embodiment of a freezing concentration device described in the present invention, the specific orientation is a description of a directional area: from the cooling surface when a dilute solution is frozen into a solid or a solid-liquid mixture, the specific orientation area is the area in the direction of the cooling surface from the cooling surface to the solid or solid-liquid mixture (except for the solid layer with low solute content adjacent to the cooling surface). This area can be inside or outside the solid or solid-liquid mixture (related to the position of the cooling surface). The shapes of the heat source include: point-shaped, line (column)-shaped, surface (plate)-shaped, and spherical; for the heat source set in a specific orientation, the heat transfer direction of the heat source is characterized in that when transferring heat to the solid or solid-liquid mixture, the heat is avoided as much as possible from being transferred to the solid layer with low solute content in the solid or solid-liquid mixture first.

[0023] As a preferred embodiment of the freezing concentration device described in the present invention, the freezing and thawing assembly is equipped with a heat insulation device, which can be used as needed.

[0024] As a preferred embodiment of the freeze concentration device described in the present invention, the freeze-thaw assembly is equipped with a device for manufacturing a guide channel, and a guide channel is set on the solid or solid-liquid mixture obtained by freezing, which can improve the effect of freeze concentration and separation and purification.

[0025] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution:

[0026] An application of the above-mentioned freezing concentration device in the fields of food, cosmetics, biomedicine, environmental protection treatment, etc.

[0027] 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.

[0028] An application of the above-mentioned freezing concentration device in the field of freezing concentration and separation and purification of heat-sensitive raw materials.

[0029] 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.

[0030] The beneficial effects of the present invention are as follows:

[0031] The present invention proposes a freeze concentration device, including a freeze-thaw component, in which a dilute solution is frozen into a solid or a solid-liquid mixture, so that when the solid or solid-liquid mixture is heated and dissolved, the surface solid layer in the solution separation outflow direction does not form a dense solid layer, or the density of the surface solid layer in the solution separation outflow direction is smaller than the density of the surface solid layer in other directions, the solid or solid-liquid mixture is heated and dissolved, 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 continuously frozen and dissolved using the freeze concentration device to achieve dilute solution concentration. The present invention improves the efficiency of freeze concentration and separation purification, and the equipment and operation are simple, which is convenient for application in the fields of food, cosmetics, biomedicine, environmental protection treatment, etc. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] 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 the structures shown in these drawings without paying creative work.

[0033] Figure 1 The figure is a schematic structural diagram of a freezing concentration device according to an embodiment of the present invention.

[0034] Figure 2 It is a schematic cross-sectional view of a freezing concentration device according to an embodiment of the present invention.

[0035] Figure 3 It is a schematic cross-sectional view of a dilute solution when it is frozen in the freeze-thaw assembly of the embodiment.

[0036] Figure 4 The figure is a schematic cross-sectional view of a freeze concentration device according to an embodiment when performing dissolution separation.

[0037] Figure 5 It is a schematic vertical section diagram of a heater when a heat medium is used in the present invention.

[0038] In the figure: 1-container, 2-container cover, 3-solution receiving device, 4-heat source, 5-solution outlet valve, 6-support leg, 7-solution outlet, 8-ice support rack, 9-power socket, 10-temperature control switch, 11-protective cover, 12-dilute solution, 13-solid or solid-liquid mixture, 14-surface solid layer, 15-insulating layer, 16-heat medium inlet, 17-heat medium outlet.

[0039] 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

[0040] 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.

[0041] The present invention provides a freezing concentration device, such as Figure 1-4 As shown, including:

[0042] Freeze-thaw component; a dilute solution is frozen into a solid or a solid-liquid mixture in the freeze-thaw component, so that when the solid or solid-liquid mixture is heated and dissolved, the surface solid layer 14 in the solution separation and outflow direction does not form a dense solid layer, or the density of the surface solid layer 14 in the solution separation and outflow direction is smaller than the density of the surface solid layer 14 in other directions; the direction that makes it easier for the solution to be separated and outflowed is set as the solution separation and outflow direction when the solid or solid-liquid mixture is heated and dissolved.

[0043] The solid or solid-liquid mixture is heated and dissolved, and the solution is retained in stages. The solution that meets the target concentration is retained for use, and the solution that does not meet the target concentration is further frozen and dissolved using the freezing concentration device to achieve concentration of the dilute solution.

[0044] In one embodiment of the present invention, a cylindrical freezing concentration device is provided, comprising a cylindrical container 1, a container cover 2, a solution receiving device 3, a columnar heat source 4, etc. The container cover 2 is made of a material with a smaller thermal conductivity than other surfaces and has a heat insulation layer 15 for heat insulation protection; the columnar heat source 4 is installed at the bottom center of the container 1, and the columnar heat source 4 is located at the central axis of the cylindrical container 1 and its surrounding area. One columnar heat source 4 (heating rod) or multiple columnar heat sources 4 (multiple heat source rods) can be set in this area; the top of the columnar heat source 4 is flush with the opening of the container 1. The solution receiving device 3 is provided with a solution outlet 7, a solution outlet valve 5, and a support leg 6. A power socket 9 is provided at the bottom of the container 1, and the power cord is connected to the power socket 9. The power socket 9 is provided with a temperature control switch 10, and a protective cover 11 is provided on the power socket 9. An ice support rack 8 is also provided on the container cover 2.

[0045] During operation, the diluted solution 12 is poured into the container 1, the container cover 2 is fastened to the open end of the container 1, and the device is inverted (the container cover 2 is at the bottom) and placed in a freezing device for freezing (such as Figure 3 After the dilute solution is frozen into a solid or solid-liquid mixture 13, the device is removed from the freezing equipment, and the container cover 2 is opened and removed. Then, the solution receiving device 3 is fastened to the open end of the container 1; with the solution receiving device 3 at the bottom, the device is placed on a platform (such as Figure 4). The solid or solid-liquid mixture 13 is heated and dissolved, and the surface solid layer 14 of the opening of the container 1 is the solution separation outflow surface during the dissolution.

[0046] like Figure 5 As shown, in the freezing and thawing assembly of the present invention, the heat source can also have another embodiment: the heat source 4 can use a heat source medium (such as a fluid, etc.) to transfer heat to the solid. When the heat source medium (such as a fluid, etc.) is selected, the schematic diagram of the structural cross-section of the heat source is as follows Figure 5 As shown, the heat source 4 is a jacketed cylindrical tube with a small cylindrical tube in the middle. When using a heat source medium, the heat is transferred to the solid (ice body) by controlling the heat source medium to pass through the heat source 4, the heat medium heat medium inlet 16 enters the heat source 4, and then flows out of the heat source 4 from the heat medium outlet 17 to achieve heat transfer; the other steps are the same as the operation of the above device.

[0047] 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: Freeze-thaw components; The dilute solution is frozen into a solid or a solid-liquid mixture in the freeze-thaw assembly, so that when the solid or solid-liquid mixture is heated and dissolved, the density of the surface solid layer in the direction of solution separation and outflow is smaller than the density of the surface solid layer in other directions; The solid or solid-liquid mixture is heated and dissolved, and the solution is retained in stages. The solution that meets the target concentration is retained for use, and the solution that does not meet the target concentration is further frozen and dissolved using the freezing concentration device to achieve concentration of the dilute solution.

2. The freeze concentration device according to claim 1, characterized in that: The thermal conductivity of the material of the container portion in the solution outflow direction of the freeze-thaw component is smaller than that of other surfaces, and thermal insulation measures are taken for this container portion.

3. The freeze concentration device according to claim 1, characterized in that: The dilute solution is frozen into a solid or a solid-liquid mixture in the freeze-thaw component, and the internal solid structure characteristics are related to the cooling surface during the freezing process; the solution separation and outflow direction of the freeze-thaw component is determined according to the position of the cooling surface when the dilute solution is frozen.

4. The freeze concentration device according to claim 1, characterized in that: During freezing, a material with a smaller thermal conductivity than other surfaces is selected to make the bottom panel of the freeze-thaw component, and the solution outlet of the freeze-thaw component is set at the bottom of the freeze-thaw component, or the entire bottom panel is designed to be a switchable panel.

5. The freeze concentration device according to claim 1, characterized in that: The method of heating and dissolving the solid or solid-liquid mixture is that the solid or solid-liquid mixture dissolves naturally.

6. The freeze concentration device according to claim 1, characterized in that: The method of heating and dissolving a solid or a solid-liquid mixture is to directly transfer heat to the solid or the solid-liquid mixture.

7. The freeze concentration device according to claim 1, characterized in that: The method of heating and dissolving a solid or a solid-liquid mixture is as follows: a heat source is set at a specific position inside or outside the solid or solid-liquid mixture to transfer heat to it. The specific position is a description of a directional area: from the cooling surface when a dilute solution is frozen into a solid or a solid-liquid mixture, the specific position area is the area in the direction of the solid or solid-liquid mixture leaving the cooling surface. When transferring heat to the solid or solid-liquid mixture, try to avoid transferring the heat to the solid layer with low solute content in the solid or solid-liquid mixture first.

8. Application of the freezing concentration device according to any one of claims 1 to 7 in the fields of food, cosmetics, biomedicine, and environmental protection treatment.

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