Freeze concentration device

Abstract

The invention belongs to the technical field of freeze concentration, and relates to a freeze concentration device which comprises a freeze dissolution assembly. The freezing dissolving assembly comprises a container, a container cover, a container base, a heat source and a solution outlet; the solution outlet is formed in the center of the container base; the heat source is arranged at the central axis of the container cover and a nearby area; freezing the dilute solution in the container into a solid or a solid-liquid mixture during freezing; and transferring heat to the solid or solid-liquid mixture by using a heat source to dissolve, staged reserving the solution, reserving the solution conforming to the target concentration for later use, and continuing freezing and dissolving the solution not conforming to the target concentration by using the freezing and concentrating device to realize the concentration of the dilute solution. The problems that in the freezing process of a dilute solution, solute can be concentrated towards the center and the bottom of a container, and the separation effect and efficiency of the solution during dissolution can be affected due to the fact that a longitudinal layered solid layer is formed by the internal structure of a solid obtained through freezing are solved, and the freezing concentration effect and efficiency are improved.

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 have a major problem: the effect 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 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. However, there are factors that affect the concentration effect and efficiency of the second freeze concentration method: factors such as the dense ice layer with low 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 CN202411098564.3) 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, usually during the freezing process of a dilute solution, on the one hand, the solute will concentrate toward the center and bottom of the container, that is, toward the symmetrical center and bottom of the cooling surface; on the other hand, the internal structure of the solid obtained by freezing will usually form a longitudinal layered solid layer. In the operation of the device in the public document (application number CN202411098564.3): when freezing, keep the opening of the container facing upward, and when dissolving, keep the opening of the container facing downward. In this way, the solution with a high solute concentration will have a longer path for dissolving and separating from the solid, which will affect the efficiency of the separation. If the operation of the device in the public document (application number CN202411098564.3) is changed: for example, a modification is made to add an outlet to the bottom of the container. At this time, although the modified device can reduce the path for the solution with high solute concentration to dissolve and separate from the solid, since a heating device is set at the center of the container of the device (the symmetry center of the cooling surface), the setting of the solution outlet will deviate from the center; due to the existence of the longitudinal layered solid layer of the solid, most of the solutes in the central area (high-concentration solution) will almost be hindered by the longitudinal layered solid layer when flowing to the outlet deviated from the center, that is, the separation efficiency of the high-concentration solution is affected, thereby affecting the effect and efficiency of freeze concentration. Summary of the invention

[0010] In order to solve the problems existing in the prior art, the present invention proposes a freezing concentration device based on the discovery that under normal circumstances, the solutes of a dilute solution will concentrate toward the center and bottom of the container (i.e., toward the symmetrical center and bottom of the cooling surface) during the freezing process, and that under normal circumstances, the internal structure of the solid obtained by freezing forms a longitudinal layered solid layer, which affects the separation effect and efficiency of the solution during the dissolution process.

[0011] To solve the above technical problems, according to one aspect of the present invention, the present invention provides the following technical solutions: A freeze concentration device, comprising: a freeze-thaw component; The freeze-thaw assembly includes a container, a container cover, a container base, a heat source, and a solution outlet; The solution outlet is arranged at the center of the container base; The heat source is arranged at the central axis position of the container cover and its vicinity; During freezing, the dilute solution in the container is frozen into a solid or a solid-liquid mixture; then, a heat source is used to transfer heat to the solid or solid-liquid mixture to dissolve it, 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.

[0012] As a preferred embodiment of the freezing concentration device described in the present invention, the device further comprises a solution outlet protection cover arranged outside the solution outlet.

[0013] As a preferred embodiment of the freezing concentration device described in the present invention, a solution outlet valve is provided on the solution outlet.

[0014] As a preferred embodiment of the freezing and concentrating device described in the present invention, one or more heat sources are provided, and the heat source can be a heating element (such as an electric heating element, etc.) or a heat medium (such as a fluid, etc.) as the heat source.

[0015] 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.

[0016] As a preferred embodiment of the freezing and concentrating device described in the present invention, the dilute solution is frozen into a solid or a solid-liquid mixture in other refrigeration equipment.

[0017] To solve the above technical problem, according to another aspect of the present invention, the present invention provides the following technical solution: The above-mentioned freezing concentration device is used in the fields of food, cosmetics, biomedicine, petrochemical industry, environmental protection treatment, etc.

[0018] The above-mentioned freezing and concentrating device is used in the fields of milk, vinegar (including vinegar-containing food, vinegar beverages, condiments, etc.), wine, beverages (such as juice, coffee, tea, soy milk, soy milk, etc.), chemical liquid, Chinese herbal medicine liquid, plant extract, petroleum purification, chemical purification, seawater purification, wastewater treatment, etc.

[0019] An application of the above-mentioned freezing concentration device in the field of freezing concentration and separation and purification of heat-sensitive raw materials.

[0020] The above-mentioned freezing concentration device is used in the fields of freezing concentration and separation and purification of milk, vinegar (including vinegar-containing food, vinegar beverages, condiments, etc.), wine, beverages (such as juice, coffee, tea, soy milk, soy milk, etc.), chemical liquid, Chinese herbal medicine liquid, plant extract, seawater purification, petroleum purification, chemical purification, wastewater treatment, etc.

[0021] The beneficial effects of the present invention are as follows: The present invention proposes a freeze concentration device, including a freeze-thaw component; the freeze-thaw component includes a container, a container cover, a container base, a heat source, and a solution outlet; the solution outlet is arranged at the center position of the container base; the heat source is arranged at the center axis position of the container cover and its vicinity; during freezing, the dilute solution in the container is frozen into a solid or a solid-liquid mixture in the freezing device; then the container is removed from the freezing device, and the heat source is used to transfer heat to the solid or the solid-liquid mixture for dissolution, and the solution is retained in sections, and the solution that meets the target concentration is retained for standby, and the solution that does not meet the target concentration is continued to be frozen and dissolved using the freeze concentration device to achieve dilute solution concentration. After freezing is completed using the device described in the present invention, the solid with high solute content will be concentrated at the solution outlet and its vicinity arranged at the center position of the container base of the container, and is also in the heat source and its vicinity. After heating and dissolving, the solution with high solute content is easier to flow out from the solution outlet than the prior art, and the internal structure of the solid obtained by freezing is avoided as much as possible to avoid the obstacle to the outflow of the solution, and the freeze concentration effect and efficiency are further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] 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.

[0023] Figure 1 It is a structural schematic diagram of a freezing concentration device of the present invention; Figure 2 It is a schematic cross-sectional view of a freezing concentration device of the present invention.

[0024] In the figure, 1-container cover, 2-container, 3-container base, 4-solution outlet protection cover, 5-solution outlet, 6-heat source, 7-protection cover, 8-socket, 9-temperature control switch, 10-insulation layer, 11-bracket, 12-solid or solid-liquid mixture.

[0025] 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

[0026] 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.

[0027] The present invention provides a freezing concentration device, such as Figure 1-2 As shown, including: A freeze concentration device, comprising: a freeze-thaw component; The freeze-thaw assembly includes a container 2, a container cover 1, a container base 3, a heat source 6, and a solution outlet 5; The solution outlet 5 is arranged at the center of the container base 3; The heat source 6 is arranged at the central axis position of the container cover 1 and its vicinity; During freezing, the dilute solution in the container 2 is frozen into a solid or a solid-liquid mixture 12; then the container 2 is removed from the freezing equipment, and the heat source 6 is used to transfer heat to the solid or solid-liquid mixture 12 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.

[0028] By using the device of the present invention, after freezing is completed, the solid or solid-liquid mixture with a high solute content will be concentrated at the bottom of the center of the container, that is, the solution outlet 5 and its vicinity, and also at the heat source 6 and its vicinity, thereby improving the efficiency and effect of dissolution and separation of the device.

[0029] In one embodiment of the present invention, the device further comprises a solution outlet protection cover 4 disposed outside the solution outlet 5 to prevent the outlet valve from being damaged under low temperature conditions.

[0030] In one embodiment of the present invention, a solution outlet valve is provided on the solution outlet 5 .

[0031] In one embodiment of the present invention, one or more heat sources 6 are provided, and the heat source 6 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 a heat source.

[0032] In one embodiment of the present invention, the device further comprises a heat insulating device for being mounted outside the container to achieve heat insulation.

[0033] In one embodiment of the present invention, a bracket 11 is further provided at the bottom of the container base 3 for supporting the container 2 during heating and dissolving.

[0034] In one embodiment of the present invention, the container cover 1 , the container base 3 , and the solution outlet protection cover 4 are all provided with a heat-insulating layer 10 .

[0035] In one embodiment of the present invention, a socket 8 and a temperature control switch 9 are provided on the container cover 1, a power line and a control line are connected to the socket 8 and the temperature control switch 9, and a protective cover 7 is provided on the socket 8 and the temperature control switch 9.

[0036] When the freeze concentration device of the present invention is used, the dilute solution is injected into the container 2, the container cover 1 is fastened, and the solution outlet protective cover 4 under the container base 3 is fastened. The device is sent into the freezing equipment, and after the dilute solution is frozen into the required solid or solid-liquid mixture 12, the container 2 is removed from the freezing equipment, the protective cover 7 is opened, the power supply is connected by the socket 8, the heating temperature is set by the temperature control switch 9, and heat is transferred to the solid or solid-liquid mixture 12 for dissolution, the solution outlet protective cover 4 is opened, and the solution outlet valve is opened and closed to realize segmented solution retention, the solution that meets the target concentration is retained for standby, 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.

[0037] 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 freeze-thaw assembly includes a container, a container cover, a container base, a heat source, and a solution outlet; The solution outlet is arranged at the center of the container base; The heat source is arranged at the central axis position of the container cover and its vicinity; During freezing, the dilute solution in the container is frozen into a solid or a solid-liquid mixture; then, a heat source is used to transfer heat to the solid or solid-liquid mixture to dissolve it, 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.

2. The freeze concentration device according to claim 1, characterized in that: The device also includes a solution outlet protection cover arranged outside the solution outlet.

3. The freeze concentration device according to claim 1, characterized in that: A solution outlet valve is arranged on the solution outlet.

4. The freeze concentration device according to claim 1, characterized in that: One or more heat sources are provided, and the heat source is a heating element or a heat medium is used as the heat source.

5. 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.

6. The freeze concentration device according to claim 1, characterized in that: Dilute solutions are frozen into solids or solid-liquid mixtures in other refrigeration equipment.

7. Application of the freezing concentration device according to any one of claims 1 to 6 in the fields of food, cosmetics, biomedicine, petrochemical industry, and environmental protection treatment.

8. Application of the freezing concentration device according to any one of claims 1 to 6 in the fields of milk, vinegar, wine, beverages, chemical liquids, Chinese herbal liquids, plant extracts, seawater purification, petroleum purification, chemical purification, and wastewater treatment.

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