Integrated suspension freezing concentration device and method

Abstract

The present invention discloses an integrated suspension freezing concentration device and method, wherein the device includes a receiving unit for receiving raw materials, a freezing unit for cooling the receiving unit and a control unit, the receiving unit includes a receiving chamber, the receiving chamber includes a growth zone located at the top, a nucleation zone located below the growth zone, the freezing unit includes a heat exchange plate located at the bottom of the nucleation zone, a circulating refrigeration unit for cooling the heat exchange plate, a scraper assembly is provided on the bottom wall of the receiving chamber, the scraper assembly includes a scraper penetrating the bottom wall of the receiving chamber and matching the upper side wall of the heat exchange plate, the scraper rotates relative to the heat exchange plate to remove the crystal nuclei grown on the heat exchange plate. The present invention has at least the following advantages: high degree of integration, compact and optimized structure.

Description

Technical Field

[0001] The present invention relates to freeze concentration technology, and in particular to an integrated suspension freeze concentration device and method. Background Art

[0002] Freeze concentration is an effective method for removing solvents from solutions and is widely used in the concentration of heat-sensitive solutions. There are two main types of freeze concentration: progressive and suspended. The progressive freeze concentration device is simple and easy to operate, but the heat exchange efficiency is low as the concentration process proceeds. The suspended freeze concentration has high efficiency, but the device is complex. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an integrated suspension freezing concentration device and method, which has a high degree of integration and a compact and optimized structure.

[0004] In order to solve the above technical problems, the present invention provides an integrated suspension freezing concentration device, including a receiving unit for receiving raw materials, a freezing unit and a control unit for cooling the receiving unit, the receiving unit including a receiving chamber, the receiving chamber including a growth zone located at the top and a nucleation zone located below the growth zone, the freezing unit including a heat exchange plate located at the bottom of the nucleation zone, a circulating refrigeration unit for cooling the heat exchange plate, a scraper assembly is provided on the bottom wall of the receiving chamber, the scraper assembly includes a scraper that penetrates the bottom wall of the receiving chamber and fits the upper side wall of the heat exchange plate, the scraper rotates relative to the heat exchange plate to remove the crystal nuclei grown on the heat exchange plate.

[0005] Furthermore, the lower side wall of the heat exchange plate is sealedly connected to the side wall of the receiving cavity to form a cooling cavity, the freezing unit includes the cooling cavity, and the circulating refrigeration unit is connected to the cooling cavity through a pipeline to form a circulation loop.

[0006] Furthermore, an installation cavity matching the shape of the receiving cavity is sleeved on the outer side of the receiving cavity, and the installation cavity corresponds to the cavity body of the growth zone to form a vacuum cavity.

[0007] Furthermore, a cover plate for sealing the installation cavity and the receiving cavity respectively is arranged on the upper part of the installation cavity, and a stirring paddle is arranged on the cover plate, which extends into the receiving cavity and is used to drive the crystal nucleus to float.

[0008] Furthermore, the bottom wall of the installation cavity seals the bottom of the receiving cavity, a drainage port is provided on the bottom wall of the installation cavity, and a filter screen for filtering out the crystal nuclei is provided at the drainage port.

[0009] Furthermore, an air hole connected to the receiving cavity is formed on the cover plate, and the air hole is connected to a compression component that applies pressure to the receiving cavity.

[0010] Furthermore, the scraper assembly includes a scraper shaft extending into the receiving cavity in a vertical direction and passing through the heat exchange plate, and an elastic plate fixedly arranged on the scraper shaft, and the scraper is hinged to the elastic plate and adheres to the upper side wall of the heat exchange plate.

[0011] Furthermore, the upper side surface of the heat exchange plate is in an inverted eight-shaped shape.

[0012] Furthermore, a temperature measuring component for monitoring the temperature of the coolant is provided at the outlet of the circulating refrigeration unit.

[0013] The present invention provides an integrated suspension freezing concentration method, based on the integrated suspension freezing concentration device according to any one of claims 1 to 9, comprising the following steps:

[0014] Step 1: Start the refrigeration unit, specifically including: start the circulating refrigeration unit, and set the preset cooling temperature through the control unit, and after reaching the preset cooling temperature, pump the refrigerant into the cooling chamber;

[0015] Step 2: Add the raw materials into the receiving cavity;

[0016] Step 3: starting the stirring action, specifically including: Step 31: turning on the scraper, and setting a preset speed of the scraper through the control unit; Step 32: turning on the stirring paddle, and setting a preset speed of the stirring paddle through the control unit;

[0017] Step 4: Cooling action, specifically including: the heat of the raw material is transferred into the cooling chamber through the heat exchange plate and taken away by the refrigerant, the temperature of the raw material drops until crystal nuclei are formed on the heat exchange plate, the crystal nuclei are scraped off by the scraper and float to the growth zone under the action of the stirring paddle, and the crystal nuclei grow evenly in the growth zone until the preset concentration end point is reached;

[0018] Step 5: collecting the concentrated liquid, specifically comprising: closing the circulating refrigeration unit and applying pressure to the receiving chamber through the compression component, and the concentrated liquid flows into the external receiving part through the discharge port;

[0019] Step 6: secondary collection of the concentrated liquid, specifically including: cleaning the crystal nuclei reserved in the receiving cavity, collecting a small amount of concentrated liquid entrained in the crystal nuclei, and completing the collection.

[0020] By means of the above technical scheme, the present invention has at least the following advantages: by providing a freezing unit, the raw material can be better cooled to produce crystal nuclei; the scraper assembly can better scrape the crystal nuclei from the heat exchange plate, so that the crystal nuclei rely on their own buoyancy to rise to the growth zone and grow evenly until the concentrated liquid reaches a preset concentration and is discharged; the overall integration level is high, and the structure is compact and optimized. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0022] Figure 2 It is a schematic diagram of the structure of the scraper assembly of the present invention;

[0023] Figure 3 It is a cross-sectional view of the scraper assembly of the present invention.

[0024] In the above figures: 1. receiving chamber; 2. heat exchange plate; 3. circulating refrigeration unit; 4. scraper; 5. cooling chamber; 6. installation chamber; 7. vacuum chamber; 8. cover plate; 9. stirring paddle; 10. drain port; 11. filter screen; 12. air hole; 13. scraper shaft; 14. elastic plate; 15. temperature measurement component. DETAILED DESCRIPTION

[0025] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0026] Combination Figure 1 and Figure 2 As shown, the present invention discloses an integrated suspension freezing concentration device, including a receiving unit for receiving raw materials, a freezing unit for cooling the receiving unit, and a control unit. In the present invention, the receiving unit includes a receiving chamber 1, and the receiving chamber 1 includes a growth zone located at the top and a nucleation zone located below the growth zone. The outer side of the receiving chamber 1 is sleeved with an installation chamber 6 that matches the shape of the receiving chamber 1, and the installation chamber 6 forms a vacuum chamber 7 corresponding to the cavity of the growth zone. By providing the vacuum chamber 7, the heat exchange between the growth zone and the outside can be effectively isolated, the heat loss can be reduced, and the structure is optimized.

[0027] In the present invention, a cover plate 8 is provided on the upper part of the installation cavity 6, which respectively seals the installation cavity 6 and the receiving cavity 1, and a stirring paddle 9 is provided on the cover plate 8, which extends into the receiving cavity 1 and is used to drive the crystal nucleus to float. By providing the cover plate 8, the heat exchange between the growth area and the outside world can be reduced. A stirring motor is fixedly provided on the lower surface of the cover plate 8 to provide a power source for the stirring paddle 9. A cover plate handle is fixedly provided on the upper surface of the cover plate 8, which can facilitate the taking of the cover plate 8 and optimize the structure. In the present invention, a support frame for supporting the installation cavity 6 is provided at the bottom of the installation cavity 6.

[0028] In the present invention, the bottom wall of the installation cavity 6 seals the bottom of the receiving cavity 1, a drain port 10 is provided on the bottom wall of the installation cavity 6, and a filter screen 11 for filtering out the crystal nuclei is provided at the drain port 10. Preferably, the filter screen 11 is attached to the bottom wall of the installation cavity 6. An air hole 12 connected to the receiving cavity 1 is provided on the cover plate 8, and the air hole 12 is connected to a compression component that applies pressure to the receiving cavity 1. Through the above-mentioned setting, during the drainage process, the compression component applies a certain pressure to the receiving cavity 1, so that the concentrated liquid quickly passes through the filter screen 11 to complete the drainage action.

[0029] In the present invention, the freezing unit includes a heat exchange plate 2 located at the bottom of the nucleation zone, and a circulating refrigeration unit 3 for cooling the heat exchange plate 2. The lower side wall of the heat exchange plate 2 is sealed and connected to the side wall of the receiving cavity 1 to form a cooling cavity 5, the freezing unit includes the cooling cavity 5, and the circulating refrigeration unit 3 is connected to the cooling cavity 5 through a pipeline to form a circulation loop. In the present invention, preferably, a temperature measurement component 15 for monitoring the temperature of the coolant is provided at the outlet of the circulating refrigeration unit 3.

[0030] The bottom wall of the receiving chamber 1 of the present invention is provided with a scraper assembly, and the scraper assembly includes a scraper 4 that penetrates the bottom wall of the receiving chamber 1 and fits the upper side wall of the heat exchange plate 2. The scraper 4 rotates relative to the heat exchange plate 2 to remove the crystal nuclei grown on the heat exchange plate 2. Through the above-mentioned setting, the scraper 4 can effectively scrape off the crystal nuclei grown on one side of the nucleation zone of the heat exchange plate 2, and avoid the growth of the crystal nuclei on the heat exchange plate 2 and causing the scraper 4 to get stuck. Among them, the stirring paddle 9 can provide power to assist the crystal nuclei scraped by the scraper 4 to float to the growth zone when working, and achieve sufficient mixing, with a compact and optimized structure.

[0031] In the present invention, the upper side surface of the heat exchange plate 2 is in an inverted eight-shaped shape; the scraper assembly includes a scraper shaft 13 extending into the receiving cavity 1 in the vertical direction and passing through the heat exchange plate 2, and an elastic plate 14 fixedly arranged on the scraper shaft 13, and the scraper 4 is hinged to the elastic plate 14 and affixed to the upper side wall of the heat exchange plate 2. In the present invention, it is preferred that the scraper 4 is made of a polymer material, which has good wear resistance and small friction with the heat exchange plate. The elastic plate 14 and the scraper 4 are connected in a hinged manner, so that the angle of the scraper 4 can be adjusted so as to be close to the heat exchange plate 2. In the present invention, it is preferred that the elastic plate 14 is made of stainless steel, and a notch for abutting the scraper 4 is provided on the side of the elastic plate 14 close to the scraper shaft 13. The setting of the notch can ensure that the elastic plate 14 has a certain elasticity without losing rigidity.

[0032] In the present invention, the scraper assembly also includes a scraper shaft seal that is sleeved on the scraper shaft 13 and fixed on the bottom wall of the mounting cavity 6. By providing the scraper shaft seal, leakage of refrigerant and / or concentrated liquid can be effectively prevented. The scraper shaft seal includes a cylindrical shell, a first sealing ring, a second sealing ring, a third sealing ring and a bearing that are sequentially arranged in the shell along the axis of the shell. In the present invention, the shell is preferably made of stainless steel.

[0033] The present invention provides an integrated suspension freezing concentration method, based on the integrated suspension freezing concentration device according to any one of claims 1 to 9, comprising the following steps:

[0034] Step 1: Start the refrigeration unit, specifically including: start the circulating refrigeration unit 3, and set a preset cooling temperature through the control unit, and after reaching the preset cooling temperature, pump the refrigerant into the cooling chamber 5;

[0035] Step 2: Add the raw materials into the receiving chamber 1;

[0036] Step 3: starting the stirring action, specifically comprising: Step 31: turning on the scraper 4, and setting a preset speed of the scraper 4 through the control unit; Step 32: turning on the stirring paddle 9, and setting a preset speed of the stirring paddle 9 through the control unit;

[0037] Step 4: Cooling action, specifically including: the heat of the raw material is transferred into the cooling chamber 5 through the heat exchange plate 2 and taken away by the refrigerant, the temperature of the raw material drops until crystal nuclei are formed on the heat exchange plate 2, the crystal nuclei are scraped off by the scraper 4 and float to the growth zone under the action of the stirring paddle 9, and the crystal nuclei grow evenly in the growth zone until the preset concentration end point is reached;

[0038] Step 5: collecting the concentrated liquid, specifically comprising: closing the circulating refrigeration unit 3 and applying pressure to the receiving chamber 1 through the compression component, and the concentrated liquid flows into the external receiving component through the drain port 10;

[0039] Step 6: secondary collection of the concentrated liquid, specifically including: cleaning the crystal nuclei reserved in the receiving chamber 1, collecting a small amount of concentrated liquid entrained in the crystal nuclei, and completing the collection.

[0040] The above-described embodiments are only preferred embodiments for fully illustrating the present invention, and the protection scope of the present invention is not limited thereto. Equivalent substitutions or changes made by those skilled in the art based on the present invention are within the protection scope of the present invention. The protection scope of the present invention shall be subject to the claims.

Claims

1. An integrated suspension freezing concentration device, characterized in that: It comprises a receiving unit for receiving raw materials, a freezing unit for cooling the receiving unit and a control unit, the receiving unit comprises a receiving cavity, the receiving cavity comprises a growth zone located at the top and a nucleation zone located below the growth zone, the freezing unit comprises a heat exchange plate located at the bottom of the nucleation zone, and a circulating refrigeration unit for cooling the heat exchange plate, the upper side of the heat exchange plate is in an inverted eight-shaped shape; A scraper assembly is provided on the bottom wall of the receiving cavity, and the scraper assembly includes a scraper penetrating the bottom wall of the receiving cavity and matching the upper side wall of the heat exchange plate, the scraper is located at the bottom of the nucleation zone, and the scraper rotates relative to the heat exchange plate to remove the crystal nuclei grown on the heat exchange plate; A stirring paddle for driving the crystal nuclei to float is arranged in the receiving chamber, and the scraper and the stirring paddle operate independently.

2. The integrated suspension freezing concentration device according to claim 1, characterized in that: The lower side wall of the heat exchange plate is sealedly connected to the side wall of the receiving cavity to form a cooling cavity. The freezing unit includes the cooling cavity. The circulating refrigeration unit is connected to the cooling cavity through a pipeline to form a circulation loop.

3. The integrated suspension freezing concentration device according to claim 1, characterized in that: The outer side of the receiving cavity is sleeved with an installation cavity that matches the shape of the receiving cavity, and the installation cavity corresponds to the cavity body of the growth zone to form a vacuum cavity.

4. The integrated suspension freezing concentration device according to claim 3, characterized in that: A cover plate for sealing the installation cavity and the receiving cavity respectively is arranged on the upper part of the installation cavity, and a stirring paddle extending into the receiving cavity and used for driving the crystal nucleus to float is arranged on the cover plate.

5. The integrated suspension freezing concentration device according to claim 3, characterized in that: The bottom wall of the installation cavity seals the bottom of the receiving cavity, a liquid discharge port is provided on the bottom wall of the installation cavity, and a filter screen for filtering out the crystal nuclei is arranged at the liquid discharge port.

6. The integrated suspension freezing concentration device according to claim 4, characterized in that: The cover plate is provided with an air hole connected to the receiving cavity, and the air hole is connected to a compression component for applying pressure to the receiving cavity.

7. The integrated suspension freezing concentration device according to claim 1, characterized in that: The scraper assembly includes a scraper shaft extending into the receiving cavity along the vertical direction and passing through the heat exchange plate, and an elastic plate fixedly arranged on the scraper shaft. The scraper is hinged to the elastic plate and adheres to the upper side wall of the heat exchange plate.

8. The integrated suspension freezing concentration device according to claim 1, characterized in that: A temperature measuring component for monitoring the temperature of the coolant is arranged at the outlet of the circulating refrigeration unit.

9. An integrated suspension freezing concentration method, based on the integrated suspension freezing concentration device according to any one of claims 1 to 8, characterized in that: The method comprises the following steps: Step 1: Start the refrigeration unit, specifically including: start the circulating refrigeration unit, and set the preset cooling temperature through the control unit, and after reaching the preset cooling temperature, pump the refrigerant into the cooling chamber; Step 2: Add the raw materials into the receiving cavity; Step 3: starting the stirring action, specifically including: Step 31: turning on the scraper, and setting a preset speed of the scraper through the control unit; Step 32: turning on the stirring paddle, and setting a preset speed of the stirring paddle through the control unit; Step 4: Cooling action, specifically including: the heat of the raw material is transferred into the cooling chamber through the heat exchange plate and taken away by the refrigerant, the temperature of the raw material drops until crystal nuclei are formed on the heat exchange plate, the crystal nuclei are scraped off by the scraper and float to the growth zone under the action of the stirring paddle, and the crystal nuclei grow evenly in the growth zone until the preset concentration end point is reached; Step 5: collecting the concentrated liquid, specifically comprising: closing the circulating refrigeration unit and applying pressure to the receiving chamber through the compression component, and the concentrated liquid flows into the external receiving part through the discharge port; Step 6: secondary collection of the concentrated liquid, specifically including: cleaning the crystal nuclei reserved in the receiving cavity, collecting a small amount of concentrated liquid entrained in the crystal nuclei, and completing the collection.

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