Flat cuboid-like progressive freeze concentration tank with sandwich structure

Abstract

The utility model relates to a sandwich structure flat cuboid progressive freeze concentration tank, which comprises a tank body, a tank cover, a temperature probe, an illuminating lamp, a camera and a stirring device, flat plates are arranged on two sides of an inner cavity of the tank body, semi-cylindrical shells are arranged at two ends of the inner cavity of the tank body, the diameter and the height of the tank body are equal to the distance and the height of the flat plates on two sides, and a concave component is arranged at the bottom of the tank body; the length of each flat plate is 10-150cm, the height of each flat plate is 15-120cm, the distance between the two flat plates is 8-30cm, and concentration tanks with different volumes of 2L-500L can be constructed; the concentration tank can be used in combination with a refrigeration system, an operation control system and the like in the modes of single tank, multi-tank series connection, multi-tank group series connection and the like to form progressive freezing concentration equipment with different capacities and operation modes. The flat cuboid-like progressive freeze concentration tank with the sandwich structure has a unique tank shape, so that the thickness of ice layers growing on all cold wall surfaces in the tank can be controlled to be less than or equal to 15cm, and the influence on heat transfer caused by over-thick ice layers in the concentration process can be obviously reduced; the advantages of shortening the concentration time, reducing the energy consumption, improving the concentration efficiency, facilitating deicing and the like are realized.

Description

TECHNICAL FIELD

[0001] The utility model relates to low temperature concentration equipment technical field especially relates to a kind of interlayer structure flat cuboid progressive freezing concentration tank. BACKGROUND

[0002] Freeze concentration is a high-tech that is commonly used in food, health products, biopharmaceuticals and environmental protection industries to operate below the freezing point of aqueous solution and achieve concentration of liquid materials. Compared with conventional concentration techniques such as evaporation concentration and vacuum concentration, freeze concentration has great advantages in effectively protecting and recovering the nutritional components, bioactive components, natural aromatic flavor substances and natural pigments of heat-sensitive liquid materials. According to the different ways of ice nucleus formation and ice crystal removal in aqueous solution, freeze concentration can be divided into two major technical systems: suspended type and progressive type. Suspended freeze concentration uses a multi-ice crystal formation, growth and periodic removal operation method. It was first developed in Western developed countries. After solving the problem of efficient ice crystal removal, the concentration efficiency was greatly improved, and the equipment performance tended to be mature. It has been commercialized for more than 40 years in the fields of food, biopharmaceuticals, environmental protection and wastewater treatment. However, it has defects such as complex equipment structure, high manufacturing cost and difficulty in popularization and promotion. Progressive freeze concentration has a different operating principle from suspended freeze concentration. It is a process in which aqueous solution grows into a single thick ice layer on the cold wall surface of the concentration device, and the aqueous solution is concentrated after the ice layer is removed. Therefore, the significant advantage of progressive freeze concentration is that it does not need to configure complex ice removal equipment, the ice removal operation is relatively simple, and the equipment cost is more affordable. It has become another important development direction of freeze concentration equipment.

[0003] However, progressive freeze concentration devices need to solve some technical bottlenecks to better realize practical application. Progressive freeze concentration reduces the proportion of liquid water in the solution by growing a single ice crystal into a thick ice layer to increase the concentration of the feed liquid. Since the thermal conductivity of solid ice is only about 1 / 4 of that of liquid water, as the freeze concentration process progresses, the ice layer will become thicker and thicker, making it more difficult for the aqueous solution to transfer heat through the ice layer to the cold wall. Studies have shown that within the commonly used freeze concentration temperature range of -10℃ to -40℃, when a 2-3cm thick ice layer forms on the cold wall inside the concentration device, the ice layer thickening speed on the solution side will start to be affected. When a ≥10cm thick ice layer forms on the cold wall inside the concentration device, the ice layer thermal resistance will become a limiting factor for heat transfer in the concentration tank, affecting the concentration efficiency.

[0004] The traditional progressive freezing concentration tank usually adopts a relatively low-cost round tank design, for example, the progressive freezing concentration device and method of a double-clad structure disclosed in CN108176074A, the progressive freezing concentration device of a double-clad structure disclosed in CN210964869U, and the progressive freezing concentration device of a liquid food disclosed in CN209219223U, all of which belong to the intermittent freezing concentration test device in the form of a round tank or a round pipe. However, when the capacity of the round tank increases to a certain extent, under the condition of a suitable tank height, the radius of the concentration tank is likely to exceed 10 cm (for example, when the capacity of the round concentration tank reaches 30 L, the radius will reach 10 cm; when the capacity reaches 150 L, the radius will exceed 25 cm), which means that even if a conventional concentration ratio of 2-3 times is achieved, the thick ice layer on the inner wall 1 of the round concentration tank will seriously affect the freezing concentration process, significantly increase the operating energy consumption, and the concentration efficiency is not ideal. In addition, the ice layer formed on the inner wall 1 of the round concentration tank is a cylindrical ice ring with the center of the round tank as the center. After the freezing concentration is completed, it is difficult to break and remove the ice. The broken ice ring is in the form of an irregular sector, which is not easy to peel off and take out from the tank, increasing the labor intensity of ice removal. If the above technical problems are not solved, the traditional progressive freezing concentration device will have a long freezing concentration time, waste invalid energy consumption, increase labor intensity, reduce production efficiency, and bring difficulties to actual application. Practical new type content

[0005] Therefore, the utility model discloses a kind of sandwich structure flat cuboid progressive freezing concentration tank.

[0006] A sandwich structure flat cuboid progressive freezing concentration tank, comprising a tank body and a matching tank cover;The middle part of the tank body cavity side is two flat plates, combined with two semi-cylindrical shells at both ends, the diameter and height of the semi-cylindrical shells at both ends are equal to the distance and height of the two flat plates, and the bottom is a component with the same shape and size as the cross section of the tank body, which are welded together.

[0007] The sandwich structure flat cuboid progressive freezing concentration tank described in the utility model has a smaller ice layer thickness than that of a round concentration tank with the same volume at the same concentration ratio. The heat transfer efficiency between the solution in the tank and the ice layer is higher, and the required freezing concentration time is shorter. The flat ice layer formed on the flat cold wall is easier to remove than the cylindrical ice ring of a round concentration tank. The remaining semi-cylindrical ice layer is also easy to peel off and remove without the stress barrier of the other semi-cylindrical ice layer, and the production efficiency is higher.

[0008] Further, the size of the two plates in the middle of the tank is in the range of 10cm-150cm in length, 15cm-120cm in height, and 8cm-30cm in distance between the two plates, which is used to manufacture small tanks with a volume of 2L-50L, medium tanks with a volume of 50L-140L, and large tanks with a volume of 150L-500L, etc.

[0009] Further, the size of the two plates in the middle of the 2L-50L small tank is in the range of 10cm-50cm in length, 15cm-50cm in height, and 8cm-18cm in diameter of the semi-cylindrical shell at both ends; the size of the two plates in the middle of the 50L-150L medium tank is in the range of 50cm-80cm in length, 50cm-90cm in height, and 16cm-22cm in diameter of the semi-cylindrical shell at both ends; the size of the two plates in the middle of the 150L-500L large tank is in the range of 80cm-150cm in length, 80cm-120cm in height, and 20cm-30cm in diameter of the semi-cylindrical shell at both ends.

[0010] Further, the thickness of the coolant in the outer sandwich layer of the concentration tank is in the range of 1cm-4cm for the 2L-50L small tank, 4cm-6cm for the 50L-150L medium tank, and 6cm-10cm for the 150L-500L large tank.

[0011] Further, the bottom of the outer sandwich layer of the concentration tank includes two coolant inlets, and the upper part of the outer sandwich layer includes two coolant outlets; the two coolant inlets are respectively installed at the obliquely symmetrical tangent positions of the connection part between the semi-cylindrical outer sandwich layer and the rectangular outer sandwich layer bottom at both ends of the concentration tank body, and the two coolant outlets are respectively installed at the obliquely symmetrical tangent positions of the connection part between the semi-cylindrical outer sandwich layer and the upper end of the rectangular outer sandwich layer, so that the coolant can be smoothly pumped without obstruction, the temperature homogenization of the coolant in the sandwich layer is improved, and the coolant in the sandwich layer can be smoothly circulated back to the low-temperature coolant tank after completing the cold energy delivery.

[0012] Further, the two coolant inlets at the bottom of the outer sandwich layer and the two coolant outlets at the upper part of the outer sandwich layer of the concentration tank can be connected with the refrigeration system, the low-temperature coolant tank, the circulating pump, and the pipeline to form a low-temperature coolant circulation for the freeze concentration of the material liquid in the concentration tank; the two coolant inlets at the bottom of the outer sandwich layer and the two coolant outlets at the upper part of the outer sandwich layer of the concentration tank can also be connected with the normal-temperature coolant tank through the circulating pump and the pipeline to form a normal-temperature coolant circulation for quickly thawing the ice layer of the inner wall of the concentration tank and the ice ring joint surface at the end of the freeze concentration, and for separating and removing the ice ring.

[0013] Further, a temperature probe is installed in the outer interlayer of the condensing tank; two temperature recording probes are installed in the tank, one of which is installed in the middle of the inner wall of one of the semi-cylinders to record the temperature change of the solution near the inner wall of the tank, and the other is installed near the center of the bottom of the tank to record the temperature change of the solution in the center of the tank.

[0014] Further, the shape of the tank cover of the condensing tank is consistent with the size of the upper end of the freezing condensing tank body, and is fixed and sealed by a sealing ring and a buckle; an LED lamp and a real-time camera device are installed on the top of the tank cover to observe, take photos or record videos of the freezing condensing process and the growth process of the ice ring in real time.

[0015] Further, according to small, medium and large three types of volume models, the condensing tank is respectively provided with 1-3 stirring devices, wherein the 2L-50L small tank is provided with one stirring device, the stirring device comprises a stirring motor and a stirring paddle, the stirring motor is installed at the geometric center of the top of the tank cover, the upper end of the stirring paddle is connected with the shaft of the stirring motor through a movable clasp, and the lower end of the stirring paddle is connected with the center of the movable disc at the bottom of the tank, and the stirring paddle can be detached if necessary; the 50L-140L medium tank is provided with two stirring devices, which are respectively installed at the middle positions of the first and third quarter lines of the transverse middle axis of the tank cover, and the stirring motor and the stirring paddle are installed in the same way as described above, but the directions of rotation of the two stirring motors are opposite; the 150L-500L large tank is provided with three stirring devices, which are respectively installed at the middle positions of the first, third and fifth quarter lines of the transverse middle axis of the tank cover, and the stirring motor and the stirring paddle are installed in the same way as described above, but the directions of rotation of the three stirring motors are sequentially opposite. The solution on the surface of the ice layer in the tank forms a uniform flow.

[0016] Further, the condensing tank can be used in combination with a refrigeration system, a low-temperature refrigerant tank, a normal-temperature refrigerant tank and an operation control system in different modes such as single tank, multiple tanks in series or multiple tanks in groups in series, to form multiple types of progressive freezing condensing equipment with different capacities, non-continuous and continuous operation modes; the operation control system is composed of a touch operation panel, a data processing and automatic control module, a recording storage and electrical control elements; the electrical control elements are connected with the refrigeration system, the stirring device, the temperature probe, the LED light and the real-time camera device, etc., to set and modify the freezing condensing operation parameters, automatically operate the whole machine, remotely monitor, and realize real-time display, storage and export of operation parameters, data and image data.

[0017] In order to better understand and implement, the present application is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Fig. 1These are front and top views of the sandwich structure flat cuboid-like cryogenic concentration tanks of different volume types in this utility model;

[0019] Fig. 2 These are three-dimensional projection views of flat, cuboid-like concentration tanks with sandwich structures of different volume types in this utility model.

[0020] Fig. 3 These are axial three-dimensional projections of flat, cuboid-like concentration tanks with sandwich structures of different volume types in this utility model.

[0021] The markings in the diagram are: 1-tank inner wall; 2-tank jacket outer wall; 3-jacket temperature probe; 4-stirring paddle; 5-first refrigerant outlet pipe; 6-liquid inlet pipe; 7-tank lid; 8-camera device; 9-stirring motor; 10-LED light; 11-second refrigerant outlet pipe; 12-tank inner wall temperature probe; 13-first refrigerant inlet pipe; 14-tank bottom temperature probe; 15-liquid discharge pipe; 16-concave tank bottom; 17-second refrigerant inlet pipe. Detailed Implementation

[0022] Please see Figs. 1-3 The sandwich structure flat cuboid progressive freeze-concentration tank of this utility model includes a tank body and its matching tank cover 7, temperature recording probe, LED light 10, real-time camera device 8 and stirring device.

[0023] The sandwich structure flat rectangular-shaped freeze-concentrating tank has two stainless steel plates on the inner wall 1 of the tank body, which are combined with a stainless steel semi-cylindrical shell at each end. The diameter and height of the stainless steel semi-cylindrical shells at both ends are equal to the distance and height between the two stainless steel plates. The bottom is a stainless steel concave component with the same shape and size as the cross-section of the tank body, all welded together. Taking into account both maximum concentration efficiency and ease of operation, the dimensions of the two stainless steel plates in the middle of the tank body range from 10cm to 150cm in length and 15cm to 120cm in height, with a distance of 8cm to 30cm between the two plates. The components of the above different size ranges form small tanks of 2L to 50L, medium tanks of 50L to 150L, ​​and large tanks of 150L to 500L, respectively. A stainless steel tank sandwich outer wall 2 is provided on the outer layer of the inner wall 1 of the freeze-concentrating tank, forming a sandwich between the inner wall 1 and the outer wall 2 for containing the refrigerant. Depending on the heat transfer requirements of small, medium, and large volume concentration tanks, the thickness of the refrigerant in the outer jacket ranges from 1cm to 10cm.

[0024] Further, the 2L-50L small flat cuboid frozen concentration tank, including tank wall 1, tank sandwich outer wall 2, sandwich temperature probe 3, 1 stirring paddle 4, first refrigerant outlet pipe 5, liquid inlet pipe 6, tank cover 7, camera 8, 1 stirring motor 9, LED lamp 10, second refrigerant outlet pipe 11, tank wall temperature probe 12, first refrigerant inlet pipe 13, tank bottom temperature probe 14, liquid outlet pipe 15, concave tank bottom 16 and second refrigerant inlet pipe 17.

[0025] Further, the 50L-150L medium flat cuboid frozen concentration tank, including tank wall 1, tank sandwich outer wall 2, sandwich temperature probe 3, 2 stirring paddles 4, first refrigerant outlet pipe 5, liquid inlet pipe 6, tank cover 7, camera 8, 2 stirring motors 9, LED lamp 10, second refrigerant outlet pipe 11, tank wall temperature probe 12, first refrigerant inlet pipe 13, tank bottom temperature probe 14, liquid outlet pipe 15, concave tank bottom 16 and second refrigerant inlet pipe 17.

[0026] Further, the 150L-500L medium flat cuboid frozen concentration tank, including tank wall 1, tank sandwich outer wall 2, sandwich temperature probe 3, 3 stirring paddles 4, first refrigerant outlet pipe 5, liquid inlet pipe 6, tank cover 7, camera 8, 3 stirring motors 9, LED lamp 10, second refrigerant outlet pipe 11, tank wall temperature probe 12, first refrigerant inlet pipe 13, tank bottom temperature probe 14, liquid outlet pipe 15, concave tank bottom 16 and second refrigerant inlet pipe 17.

[0027] The sandwich structure flat cuboid frozen concentration tank, according to small, medium and large three types of volume, the size range of the tank cavity is further optimized: the size range of the two stainless steel plates in the middle of the 2L-50L small tank is 10cm-50cm long and 15cm-50cm high, and the diameter of the semi-cylindrical shell at both ends is 8cm-18cm; the size range of the two stainless steel plates in the middle of the 50L-150L medium tank is 50cm-80cm long and 50cm-90cm high, and the diameter of the semi-cylindrical shell at both ends is 16cm-22cm; the size range of the two stainless steel plates in the middle of the 150L-500L large tank is 80cm-150cm long and 80cm-120cm high, and the diameter of the semi-cylindrical shell at both ends is 20cm-30cm.

[0028] The sandwich structure flat cuboid frozen concentration tank, according to the heat transfer needs of small, medium and large three types of volume concentration tank, the thickness size range of the outer sandwich inner refrigerant is further optimized: 1cm-4cm for the 2L-50L small tank; 4cm-6cm for the 50L-150L medium tank; 6cm-10cm for the 150L-500L large tank.

[0029] The flat cuboid-shaped freeze concentration tank with sandwich structure, according to different volume models of 2L-500L, the distance between the two stainless steel plates in the middle of the tank cavity and the diameter of the two end semi-cylindrical shells are controlled in the range of 8cm-30cm, which can help to control the maximum ice layer thickness formed on each cold wall surface during the freeze concentration process in the range of ≤4cm-15cm, which is significantly lower than the maximum ice layer thickness range of 6.5cm-32.5cm of the conventional circular concentration tank with the same volume, thereby achieving the multiple purposes of shortening the freeze concentration time, improving the concentration efficiency, reducing the energy consumption of the whole machine operation, and improving the production efficiency, etc.

[0030] The flat cuboid-shaped freeze concentration tank with sandwich structure, the outer sandwich bottom includes a first cold carrier inlet pipe 13 and a second cold carrier inlet pipe 17, and the outer sandwich upper part includes a first cold carrier outlet pipe 5 and a second cold carrier outlet pipe 1112; the first cold carrier inlet pipe 13 and the second cold carrier inlet pipe 17 at the lower end of the outer sandwich are connected with the cold carrier output system of the refrigeration system and the low-temperature cold carrier tank, and the first cold carrier outlet pipe 5 and the second cold carrier outlet pipe 1112 at the upper end of the outer sandwich are connected with the cold carrier return pipe of the refrigeration system and the low-temperature cold carrier tank, together forming the circulation of the low-temperature cold carrier between the refrigeration system, the low-temperature cold carrier tank and the concentration tank sandwich, realizing the temperature regulation and control of the cold carrier in the outer sandwich of the concentration tank by the operation control system and the refrigeration system and the low-temperature cold carrier tank, and achieving the temperature control of the material liquid in the tank through the heat transfer of the inner wall 1 of the flat cuboid-shaped freeze concentration tank, and further forming an ice layer on the inner wall 1 to realize freeze concentration.

[0031] The first cold carrier inlet pipe 13 and the second cold carrier inlet pipe 17 are respectively installed at the oblique symmetric tangent positions of the connection parts between the outer sandwich of the semi-cylindrical body at both ends of the freeze concentration tank body and the bottom of the cuboid outer sandwich, which can make the cold carrier pump in smoothly without obstruction and improve the temperature homogenization of the cold carrier in the sandwich; and the first cold carrier outlet pipe 5 and the second cold carrier outlet pipe 1112 are respectively installed at the oblique symmetric tangent positions of the connection parts between the outer sandwich of the semi-cylindrical body at both ends of the freeze concentration tank body and the upper end of the cuboid outer sandwich, which also facilitates the smooth circulation of the cold carrier in the sandwich to the low-temperature cold carrier tank for cold energy delivery.

[0032] The flat cuboid-shaped freeze concentration tank with sandwich structure, the first cold carrier inlet pipe 13 and the second cold carrier inlet pipe 17 at the lower end of the outer sandwich can also be connected with the normal-temperature cold carrier tank through a circulating pump and a pipeline, and the first cold carrier outlet pipe 5 and the second cold carrier outlet pipe 1112 at the upper end of the sandwich are connected with the cold carrier return pipe of the normal-temperature cold carrier tank, together forming the circulation of the normal-temperature cold carrier, which is used for quickly thawing the ice layer on the inner wall 1 of the concentration tank and the ice ring joint surface when the freeze concentration is completed, facilitating the ice ring to separate and be removed.

[0033] The sandwich structure flat cuboid frozen concentration tank has an inner sandwich temperature probe 3 installed in the outer sandwich layer for recording, feeding back and controlling the temperature of the sandwich cooling medium in the concentration tank in real time. One of the two semicylinders in the tank is tightly arranged with a tank inner wall temperature probe 12 in the middle of the inner wall for recording, feeding back and controlling the temperature of the tank inner wall 1 in real time, and also recording the freezing point and supercooling point of the feed liquid when initial ice crystals are formed. A tank bottom temperature probe 14 is arranged at the position close to the central axis of the tank bottom for recording, feeding back and controlling the temperature of the feed liquid in the concentration tank in real time. In the freezing concentration process, the concentration of the feed liquid is getting higher and higher, and the recorded temperature of the feed liquid is also getting lower and lower. When the ice layer appears on the tank inner wall 1, the recorded temperature value is the freezing point change value of the feed liquid at the corresponding saturation concentration. The installation mode of the two temperature probes in the tank can prevent the ice ring from freezing the temperature probes and combine them, facilitate ice removal operation, and ensure that the temperature probes are not easily damaged.

[0034] The sandwich structure flat cuboid frozen concentration tank body is provided with 1-3 stirring devices according to small, medium and large volume models. The stirring device comprises a stirring motor 9 and a stirring paddle 4. The 2L-50L small tank is provided with one stirring device. The stirring motor 9 is installed at the geometric center position of the tank cover 7. The upper end of the stirring paddle 4 is connected to the shaft rod of the stirring motor 9 through a movable clasp. The lower end of the stirring paddle 4 is connected to the center of the movable disc of the tank bottom. The stirring paddle 4 can be removed if necessary. The 50L-140L medium tank is provided with two stirring devices, which are installed at the middle positions of the first and third equal division lines of the transverse central axis of the tank cover 7. The installation modes of the stirring motor 9 and the stirring paddle 4 are the same as those described above. However, the directions of rotation of the two stirring motors 9 are opposite, so that the solution on the surface of the ice layer in the tank forms uniform flow. The 150L-500L large tank is provided with three stirring devices, which are installed at the middle positions of the first, third and fifth equal division lines of the transverse central axis of the tank cover 7. The installation modes of the stirring motor 9 and the stirring paddle 4 are the same as those described above. However, the directions of rotation of the three stirring motors 9 are opposite in sequence, so that the solution on the surface of the ice layer in the tank forms uniform flow.

[0035] The tank cover 7 of the sandwich structure flat cuboid frozen concentration tank has the same size as the upper end of the frozen concentration tank body. The tank cover 7 is fixed and sealed by a sealing ring and a buckle, and is convenient to open.

[0036] The flat cuboid frozen concentration tank with sandwich structure, the LED lamp 10 and the real-time camera 8 are installed in the inner top of the tank cover 7, and the installation positions of the LED lamp 10 and the real-time camera 8 are different according to the small, medium and large volume models. For the LED lamp 10 and the real-time camera 8 of the small tank, they are installed on both sides of the tank cover 7 near the geometric center position of the stirring paddle 4, and the growth of the ice layer on the cuboid and the semi-cylindrical wall surface in the tank can be observed and photographed; for the LED lamp 10 and the real-time camera 8 of the medium tank, they are installed on both sides of the tank cover 7 near any one of the stirring paddles 4, and the growth of the ice layer on the cuboid and the semi-cylindrical wall surface in the tank can also be observed and photographed; for the LED lamp 10 of the large tank, it is installed on either side of the middle stirring paddle 4 in the tank cover 7, and the real-time camera 8 is installed on one side of any one of the stirring paddles 4, and the growth of the ice layer on the cuboid and the semi-cylindrical wall surface in the tank can also be observed and photographed.

[0037] The flat cuboid frozen concentration tank with sandwich structure, the bottom of the tank body is a stainless steel concave bottom 16, and a liquid outlet pipe 15 is arranged at the geometric center position and connected with an outlet valve, which can be opened after the frozen concentration is completed to drain all the concentrated liquid in the tank.

[0038] The flat cuboid frozen concentration tank with sandwich structure can be used in combination with a refrigeration system, a low-temperature refrigerant tank, a normal-temperature refrigerant tank and an operation control system in different modes such as single tank, multiple tanks in series or multiple groups of tanks in series, to form multiple types of progressive frozen concentration equipment with different capacities, non-continuous and continuous operation modes. The operation control system is composed of a touch operation panel, a data processing and automatic control module, a record storage device and electrical control elements; the electrical control elements are connected with the refrigeration system, the stirring device, the temperature probe, the LED lamp 10 and the real-time camera 8, etc., to realize the setting and modification of the frozen concentration operation parameters, the automatic operation of the whole machine, the remote monitoring, the real-time display and storage of the operation parameters, data and image data, and the export.

[0039] The flat cuboid progressive freezing concentration tank has higher freezing concentration efficiency than the circular concentration tank with the same volume. The flat cuboid progressive freezing concentration tank with different models of 2L-500L has the half-width size of the middle cuboid section and the half-cylinder half-circle section radius of both ends in the range of 4cm-15cm, which can limit the thickest ice layer formed on each single cold wall surface to be ≤4cm-15cm. The circular concentration tank with the same corresponding models of 2L-500L has the radius of 6.5cm-32.5cm under the condition of suitable and operable tank height. This means that when the solution in the tank has the same ice volume ratio (the same theoretical concentration ratio), the ice layer thickness of the flat cuboid concentration tank is significantly smaller than that of the circular concentration tank with the same volume, and the smaller the volume of the tank, the greater the difference. That is, when the same concentration ratio is reached, the heat transfer limitation caused by the smaller ice layer thickness in the flat cuboid freezing concentration tank is smaller than that in the circular concentration tank with the same volume, and the concentration efficiency is significantly improved.

[0040] The flat cuboid progressive freezing concentration tank has lower energy consumption and higher production efficiency than the circular concentration tank with the same volume when achieving the same concentration ratio. As described above, when the same concentration ratio is reached, the ice layer thickness in the flat cuboid freezing concentration tank is smaller than that in the circular concentration tank with the same volume, and the smaller the ice layer thickness, the higher the heat transfer efficiency of the solution in the tank through the ice layer and the cold wall, and the shorter the required freezing concentration time. That is, under the premise of achieving the same concentration ratio, the shorter the freezing concentration time, the lower the energy consumption of the whole machine running, which is more energy-saving and environmentally friendly, and the production efficiency is higher.

[0041] The flat cuboid progressive freezing concentration tank is easier to remove ice blocks than the circular freezing concentration tank with the same volume at the end of freezing concentration, which can reduce labor intensity and save ice removal time. For the progressive freezing concentration device, the ice layer on the tank wall must be removed after each freezing concentration is completed to release the concentrated liquid, and then the next freezing concentration can be performed. The flat plate ice layer formed on the flat plate cold wall surface of the middle cuboid structure of the flat cuboid progressive freezing concentration tank is easier to remove than the cylindrical ice ring of the circular concentration tank, and the remaining two end half-cylinder ice layers are also easy to peel off and remove due to the absence of stress blocking of the other half-cylinder ice layer.

[0042] Reference Figs. 2-3Further, the structure modeling evolution of the sandwich structure flat cuboid frozen concentration tank with the volume increase can be more directly understood through the three-dimensional front view, left view, top view and axial side view of the sandwich structure flat cuboid frozen concentration tank of three different volume types of 2L-50L, 50L-150L and 150L-500L. Further, the principle of how the sandwich structure flat cuboid frozen concentration tank controls the ice layer thickness in the progressive freezing concentration, realizes the benefits of reducing the heat transfer resistance of the ice layer, reducing the running time and energy consumption, improving the concentration efficiency, and easily removing the ice, etc. can be better understood.

[0043] The above-mentioned embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, and the present application also intends to include these changes and modifications.

Claims

1. A sandwich structure flat oblong cuboid progressive freeze-concentrate can, characterized by: The application relates to a concentrated tank, which comprises a tank body and a matched tank cover; the middle part of the tank body is provided with two flat plates combined with two semicylindrical shells at two ends; the diameter and height of the semicylindrical shells at the two ends are equal to the interval and height of the two flat plates; the bottom is a component with the same shape and size as the transverse section of the tank body, and the tank body is welded together; an outer interlayer is arranged on the outer layer of the tank body and is used for containing the cold carrier.

2. The sandwich structure flat parallelepiped progressive freeze concentrate can according to claim 1, characterized in that: The size range of the two flat plates in the middle part of the tank body is as follows: the length is 10cm-150cm, the height is 15cm-120cm, and the interval between the two plates is 8cm-30cm, which is used for manufacturing small concentrated tanks with a volume of 2L-50L, medium concentrated tanks with a volume of 50L-140L and large concentrated tanks with a volume of 150L-500L; the thickness of the cold carrier in the outer interlayer is 1cm-10cm.

3. The sandwich structure flat parallelepiped progressive freeze concentrate can according to claim 2, characterized in that: The size range of the two flat plates in the middle part of the small concentrated tank with a volume of 2L-50L is as follows: the length is 10cm-50cm, the height is 15cm-50cm, and the diameter of the semicylindrical shell at the two ends is 8cm-18cm; the size range of the two flat plates in the middle part of the medium concentrated tank with a volume of 50L-150L is as follows: the length is 50cm-80cm, the height is 50cm-90cm, and the diameter of the semicylindrical shell at the two ends is 16cm-22cm; the size range of the two flat plates in the middle part of the large concentrated tank with a volume of 150L-500L is as follows: the length is 80cm-150cm, the height is 80cm-120cm, and the diameter of the semicylindrical shell at the two ends is 20cm-30cm.

4. The sandwich structure flat parallelepiped progressive freeze concentrate can according to claim 3, characterized in that: The thickness of the cold carrier in the outer interlayer of the concentrated tank is 1cm-4cm for the small concentrated tank with a volume of 2L-50L, 4cm-6cm for the medium concentrated tank with a volume of 50L-150L, and 6cm-10cm for the large concentrated tank with a volume of 150L-500L.

5. The sandwich structure flat parallelepiped progressive freeze concentrate can according to claim 1, characterized in that: The bottom of the outer interlayer of the concentrated tank comprises two cold carrier inlets, and the upper part of the outer interlayer comprises two cold carrier outlets; the two cold carrier inlets are respectively installed at the oblique symmetric tangent positions of the connecting parts between the semicylindrical outer interlayer and the rectangular outer interlayer at the bottom of the concentrated tank body at the two ends, and the two cold carrier outlets are respectively installed at the oblique symmetric tangent positions of the connecting parts between the semicylindrical outer interlayer and the rectangular outer interlayer at the upper end of the concentrated tank body at the two ends.

6. The sandwich structure flat parallelepiped progressive freeze concentrate can according to claim 5, characterized in that: The two cold carrier inlets at the bottom of the outer interlayer of the concentrated tank and the two cold carrier outlets at the upper part of the outer interlayer can be connected with a refrigeration system, a low-temperature cold carrier tank, a circulating pump and pipelines to form a low-temperature cold carrier circulation, which is used for the frozen concentration of the liquid in the concentrated tank; the two cold carrier inlets at the bottom of the outer interlayer of the concentrated tank and the two cold carrier outlets at the upper part of the outer interlayer can also be connected with a normal-temperature cold carrier tank through a circulating pump and pipelines to form a normal-temperature cold carrier circulation, which is used for quickly thawing the ice layer of the joint surface between the inner wall of the concentrated tank and the ice ring when the frozen concentration is finished, and the ice ring is separated and deiced.

7. The sandwich-structured flat parallelepiped progressive freeze-concentrator can according to claim 1, characterized in that: A temperature probe is installed in the outer interlayer of the concentrated tank; two temperature recording probes are installed in the tank body, one of which is installed at the middle part of the inner wall of one of the semicylindrical shells and is used for recording the temperature change process of the solution close to the inner wall of the tank, and the other is installed near the center of the bottom of the tank and is used for recording the temperature change process of the solution in the center of the tank.

8. The sandwich structure flat parallelepiped progressive freeze concentrate can according to claim 1, characterized in that: The shape of the tank cover of the concentration tank is consistent with the size of the upper end of the frozen concentration tank body, and is fixed and sealed by a sealing ring and a buckle; an LED lamp and a real-time camera device are installed on the top of the tank cover for observing, taking pictures or recording the frozen concentration process and the growth process of the ice ring.

9. The sandwich-structured flat parallelepiped progressive freeze-concentrator can according to claim 2, characterized in that: According to small, medium and large three types of volume models, the concentration tank is respectively provided with 1-3 stirring devices, wherein the 2L-50L small tank is provided with one stirring device, the stirring device comprises a stirring motor and a stirring paddle, the stirring motor is installed at the geometric center position of the upper surface of the tank cover, the upper end of the stirring paddle is connected with the shaft rod of the stirring motor through a movable clasp, and the lower end of the stirring paddle is connected with the center of the movable disc at the bottom of the tank cover, and the stirring paddle can be detached when necessary; the 50L-140L medium tank is provided with two stirring devices, which are respectively installed at the middle positions of the first and third equal division lines of the transverse middle axis of the tank cover, the stirring motor and the stirring paddle are installed in the same manner as described above, but the directions of the two stirring motors are opposite; the 150L-500L large tank is provided with three stirring devices, which are respectively installed at the middle positions of the first, third and fifth equal division lines of the transverse middle axis of the tank cover, the stirring motor and the stirring paddle are installed in the same manner as described above, but the directions of the three stirring motors are sequentially opposite.

10. The laminated structure flat parallelepiped progressive freeze concentrate can according to any one of claims 1-9, characterized in that: The concentration tank can be used in combination with a refrigeration system, a low-temperature carrier refrigerant tank, a normal-temperature carrier refrigerant tank and an operation control system in different modes such as single tank, multiple tank series connection or multiple tank group series connection, to form multiple types of progressive frozen concentration equipment with different capacities, non-continuous and continuous operation modes; the operation control system is composed of a touch operation panel, a data processing and automatic control module, a recording storage and electrical control elements; the electrical control elements are respectively connected with the refrigeration system, the stirring device, the temperature probe, the LED light and the real-time camera device, etc., for setting and modifying the frozen concentration operation parameters, automatic operation of the whole machine, remote monitoring, real-time display and storage of operation parameters, data and image data, and export.

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