CN115228128A - Interface progressive freezing concentration device with continuous deicing function and concentration method - Google Patents
Interface progressive freezing concentration device with continuous deicing function and concentration method Download PDFInfo
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- CN115228128A CN115228128A CN202210801714.7A CN202210801714A CN115228128A CN 115228128 A CN115228128 A CN 115228128A CN 202210801714 A CN202210801714 A CN 202210801714A CN 115228128 A CN115228128 A CN 115228128A
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- B01D9/02—Crystallisation from solutions
- B01D9/04—Crystallisation from solutions concentrating solutions by removing frozen solvent therefrom
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D9/0004—Crystallisation cooling by heat exchange
- B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
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Abstract
The invention relates to the technical field of freeze concentration, in particular to an interface progressive freeze concentration device with continuous deicing and a concentration method. Liquid is conveyed into the refrigerating unit through the liquid circulating unit; delivering a refrigerant into the refrigeration unit through a refrigerant circulation unit; the refrigerant evaporates and absorbs heat in the refrigerating unit, exchanges heat with liquid outside the refrigerating unit, and forms a flaky ice layer with certain thickness on the outer surface of the refrigerating unit; the liquid without freezing flows back to the feed liquid circulating unit; the ice in the refrigerating unit is peeled from the refrigerating unit by the ice removing mechanism, and is output to the refrigerant circulating unit. The invention can realize continuous deicing, automatic deicing and relative vacuum evaporation concentration, and has outstanding advantages in keeping the original total volatile matter content, the relative content of each component and the nutrient content of the lemon juice.
Description
Technical Field
The invention relates to the technical field of freezing concentration, in particular to an interface progressive freezing concentration device with continuous deicing and a concentration method.
Background
The freeze separation technique is a method of crystallizing water at a low temperature and forming ice bodies as the crystals grow, and then separating the ice bodies from solutes. It features normal pressure, low temp. and low energy consumption. Is particularly suitable for the concentration and separation of feed liquid with solute being heat-sensitive material.
The technology is widely applied to the fields of food, chemical industry, pharmacy and the like. For example, in the food field, since the whole freeze concentration process is performed at a low temperature, it can effectively inhibit the growth and reproduction of microorganisms, well prevent the thermal decomposition of nutrients in the product, volatilization of aromatic components, and maintain the quality of food as much as possible. For example, in the field of seawater desalination, the distillation method for desalinating seawater has high operation temperature and pressure, and high corrosion and scaling speed of equipment, so that the equipment is inconvenient to clean; meanwhile, the energy consumption of equipment is large, and 315 to 415kWh of electric energy is consumed for producing 1 ton of fresh water by multi-stage flash evaporation according to statistical data at home and abroad. Compared with the freezing method for seawater desalination, the freezing method has the advantages of low operation temperature, difficult scale formation, light corrosion, low requirement on structural materials of equipment and simple pretreatment process, the latent heat of freezing separation phase change is smaller than that of single-effect thermal evaporation, 335kJ of heat is consumed for freezing each kilogram of water, 2248kJ and 2495kJ of heat are consumed for evaporating each kilogram of water at 0 ℃ and 100 ℃, and the heat consumed for freezing separation is about 1/7 of that of the evaporation method.
The frozen concentration can be divided into two types during the concentration process according to the crystallization method: suspension freezing concentration and progressive freezing concentration. Progressive freeze concentration, also known as lamellar crystal freeze concentration, is a process in which the amount of ice flows through the different heat transfer surfaces of the vessel, the solution cools and forms a layer of ice along the cooling surfaces, which grows to form large ice chunks. However, since ice crystals are gradually formed on the surface of the cooling container, the heat transfer effect is rapidly reduced and the freezing rate is reduced as the thickness of the ice layer is increased.
Currently, various devices have been designed to improve the progressive freeze concentration process. Patent 201220254107.5 is to provide a rotary drum type freezing and concentrating device, which overcomes the difficulty of separating ice crystals from concentrated liquid in the prior freezing and concentrating equipment. Patent 200610044229.0 applies heat pump technology to interface progressive freezing concentration, and realizes cold energy recovery by converting an evaporator and a condenser. Patent 201610051881.9 adopts a flat plate falling film type freezing concentrator, and controls the flow rate of falling film solution, precooling temperature of solution and temperature of coolant to make ice on falling film ice surface aggregate and grow in the mode of single crystal ice crystal as much as possible, so that the formed ice layer has less solute carried and less loss of effective components. Patent 201620571903.X designs an upward-propelling progressive freezing and concentrating device, which utilizes the influence of the solute's own gravity to make it descend, and realizes the separation of the solute from the frozen surface without additional stirring. Patent 201810188990.4 discloses a progressive freezing and concentrating device with a double-sandwich structure, wherein the sidewall of a crystallization and concentration tank is of a double-sandwich structure. Patent 201810394909.8 uses a sleeve structure for lamellar crystallization. Patent 201810990763.3 utilizes a refrigeration partition plate to realize lamellar crystallization, and drives a cooling device to reciprocate in a crystallization chamber by a lifting device, so that separation of ice crystals and concentrated liquid food is facilitated.
However, the prior interface progressive freezing concentration device still has the technical problems of small treatment capacity, difficult continuous production, difficult realization of automatic deicing, cold energy recovery and the like.
Disclosure of Invention
Aiming at the defects of the prior technical scheme, the invention aims to provide an interface progressive freezing concentration device with continuous deicing and a concentration method, which can realize interface progressive freezing, ice layer separation and cold energy recovery of continuous deicing.
To achieve the above-mentioned object, one or more embodiments of the present invention provide the following solutions:
in a first aspect, the invention discloses an interface progressive freezing and concentrating device with continuous deicing, which comprises a refrigerating unit, a feed liquid circulating unit and a refrigerant circulating unit;
the refrigerating unit comprises heat exchange disks, a hollow shaft, a concentrated liquid tank and an ice crystal tank, wherein the heat exchange disks are sleeved on the hollow shaft at equal intervals, the lower parts of the heat exchange disks and the hollow shaft are positioned in the concentrated liquid tank, and the ice crystal tank is positioned on the side surface of the concentrated liquid tank;
the refrigerant circulating unit sends the refrigerant to the first channel of the hollow shaft, then enters the heat exchange disc for heat exchange, and then is discharged from the second channel of the hollow shaft to return to the refrigerant circulating unit;
the feed liquid circulating unit sends feed liquid to one end of the concentrated liquid tank, and then the other end of the concentrated liquid tank returns to the feed liquid circulating unit.
As a further technical scheme, the end part of the hollow shaft is connected with a driving device, and the driving device drives the hollow shaft to drive the heat exchange disc to rotate.
As a further technical scheme, the heat exchange device further comprises an air compressor, wherein the air compressor is connected with a purging pipe, and the purging pipe purges liquid on the surface of the heat exchange plate into a concentrated liquid tank.
As a further technical scheme, the heat exchange plate ice removing device further comprises an ice removing mechanism, wherein the ice removing mechanism comprises an ice removing knife, the ice removing knife is arranged on the ice crystal groove and is inclined to the circular end face of the heat exchange plate, and the ice removing knife is used for scraping off ice on the heat exchange plate.
As a further technical scheme, the refrigerant circulating unit comprises a cooling water tank, a condenser, a refrigeration compressor and a refrigerant pipeline; a condenser is arranged in the cooling water tank, the refrigerant compressor is connected to an inlet of the condenser through a refrigerant pipeline, an outlet of the condenser is connected with a condensing agent inlet of the hollow shaft through a pipeline, and an outlet of the condensing agent of the hollow shaft is connected with the refrigeration compressor.
As a further technical scheme, the feed liquid circulating unit comprises a dilute solution tank and a concentrated solution tank, wherein the dilute solution tank is connected with the liquid inlet end of the concentrated liquid tank through a pump body, and the concentrated solution tank is connected with the liquid outlet end of the concentrated liquid tank through a concentrated liquid pipeline.
As a further technical scheme, the concentrated liquid tank and the ice crystal tank are formed by a shell and a partition plate positioned in the shell, and the concentrated liquid tank and the ice crystal tank are mutually independent.
In a second aspect, the present invention also provides a method of concentration in an interfacial progressive freezing concentration apparatus with continuous deicing, comprising:
liquid is conveyed into a concentrated liquid tank of the refrigerating unit through the liquid-liquid circulation unit;
delivering the refrigerant into the hollow shaft and the heat exchange plate of the refrigerating unit through the refrigerant circulating unit;
the refrigerant exchanges heat with the liquid in the heat exchange disc, and a sheet-shaped ice layer with certain thickness is formed on the surface of the heat exchange disc;
the liquid without freezing flows back to the feed liquid circulating unit;
the formed ice peels off the flake ice layer in the refrigerating unit from the heat exchange disc unit through the deicing mechanism to form ice blocks, and the ice blocks fall into the ice crystal groove and are output to the refrigerant circulation unit.
As a further technical scheme, the ice blocks are output to a cooling water tank of the refrigerant circulating unit.
As a further technical scheme, the liquid without freezing flows back to the concentrated solution tank of the feed liquid circulating unit.
Compared with the prior art, the invention has the beneficial effects that:
the invention can realize continuous deicing and automatic deicing by arranging the heat exchange plate, the hollow shaft, the concentrated liquid tank and the ice crystal tank in the rotating process of the heat exchange plate, and can recover cold energy through the refrigerant circulating unit, the liquid of the liquid circulating unit is continuously circulated under the action of the liquid pump, and the cooling loss is small. And the liquid uniformly flows in the heat exchange plate to form an ice layer with a certain thickness, so that continuous crystallization is realized, and the ice layer is continuously deiced through the deicing mechanism, so that the separation of the ice layer and the recovery of ice bodies are realized, and the aim of concentrating the feed liquid is fulfilled within a specified time.
Drawings
The invention is further illustrated by the following examples in conjunction with the drawings.
FIG. 1 is a view of an interfacial progressive freeze concentration apparatus;
FIG. 2 is a three-dimensional schematic view of the crystallizer assembly;
FIG. 3 is a front view of the crystallizer assembly;
FIG. 4 is a top view of the crystallizer assembly;
fig. 5 is a left side view of the crystallizer assembly.
In the figure: the system comprises a 1-dilute solution tank, a 2-feed liquid pump, a 3-frequency modulation motor, a 4-air compressor, a 5-crystallizer, a 6-refrigeration compressor, a 7-refrigerant pipeline, a 8-cooling water tank, a 9-condenser, a 10-concentrated solution tank, a 11-throttle valve, a 12-concentrated solution pipeline, a 13-crystal ice pipeline, a 14-concentrated solution tank, a 15-ice crystal tank, a 16-deicing knife, a 17-heat exchange disc, a 18-purging pipe, a 19-hollow shaft and a 20-refrigerant baffle plate.
Detailed Description
So that the manner in which the above recited objects, features and advantages of the present invention can be understood in detail, a more particular description of the invention, briefly summarized above, may be had by reference to the embodiments thereof which are illustrated in the appended drawings. It should be noted that the embodiments and features of the embodiments of the present application may be combined with each other without conflict.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and therefore the scope of the present invention is not limited by the specific embodiments disclosed below.
The invention also discloses an interface progressive freezing and concentrating device with continuous deicing, which comprises a refrigerating unit, a feed liquid circulating unit and a refrigerant circulating unit, as shown in figures 1-5.
The refrigerating unit comprises a crystallizer 5; specifically, the crystallizer 5 comprises a heat exchange disc 17, a hollow shaft 19, a concentrated liquid tank 14 and an ice crystal tank 15; as shown in fig. 2, the heat exchange discs 17 are sleeved on the hollow shaft 19 at equal intervals; the hollow shaft 19 penetrates through the center of the heat exchange disc 17, a refrigerant baffle plate 20 is arranged inside the heat exchange disc 17, and the heat exchange discs 17 are respectively positioned on the hollow shaft 19 in the application; the output of the ice layer is realized through the heat exchange between the hollow shaft 19 and the liquid outside the heat exchange disc 17 and the refrigerant inside the heat exchange disc 17.
The lower part of the heat exchange plate 17 and the hollow shaft 19 are positioned in the concentrated liquid tank 14, the concentrated liquid tank 14 and the ice crystal tank 15 are arranged independently, the ice crystal tank 15 is uniformly arranged along the axial direction of the hollow shaft 19 in the concentrated liquid tank 14, and the ice removing blades 16 are positioned on two sides of the circular end face of the heat exchange plate 17, so that the ice on the surface of the heat exchange plate 17 can be conveniently scraped to the ice crystal tank 15.
Further, the hollow shaft 19 comprises an inner shaft and an outer shaft, the inner shaft is of a hollow structure, a cavity is formed between the inner shaft and the outer shaft, the inner shaft of the hollow shaft 19 is used for carrying refrigerant, the refrigerant is conveyed into the heat exchange plate 17 through a pipeline, and then is output to the refrigerant circulation unit through the cavity formed between the inner shaft and the outer shaft;
specifically, liquid in the dilute solution tank 1 is sent to the concentrated liquid tank 14 through a liquid pump, and then the liquid in the concentrated liquid tank 14 and the refrigerant in the heat exchange disc 17 are subjected to heat exchange, so that the heat exchange between the refrigerant and the liquid on the disc wall of the heat exchange disc 17 is realized, the temperature of the surface of the disc wall, namely an icing surface, is reduced, and part of water flowing through the icing surface forms a sheet ice layer with a certain thickness on the icing surface.
Furthermore, the outer surface of the upper part of the heat exchange disc 17 is also provided with a purging pipe 18, and the purging pipe 18 is symmetrically arranged on two circular end faces of the heat exchange disc 17; the blowing pipe 18 is provided with slotted holes at equal intervals, the blowing pipe 18 is connected with the air compressor 4, the air compressor 4 outputs air, and liquid which is not crystallized on the surface of the heat exchange plate 17 is blown to the concentrated liquid tank 14 through the output air, so that the liquid is prevented from entering the ice crystal tank 15.
Further, the deicing device comprises a deicing blade 16; the deicing cutter 16 is arranged above the ice crystal groove 15, the deicing cutter 16 is arranged obliquely to the circular end face of the heat exchange disc 17, and when the driving device drives the heat exchange disc 17 to rotate through the transmission device, the deicing cutter 16 scrapes ice on the heat exchange disc 17 to the ice crystal groove 15 when the heat exchange disc 17 is rotated.
Furthermore, the concentrated liquid tank 14 and the ice crystal tank 15 are formed by a shell and a partition board positioned in the shell, the concentrated liquid tank 14 and the ice crystal tank 15 are independent and not communicated with each other, the concentrated liquid tank 14 comprises two parts, the first part is a tank arranged along the length direction of the shell and a tank which is positioned in the communication with the tank and arranged along the width direction of the shell, and the first part forms a comb shape on the whole; the housing cavity outside the concentrate tank 14 forms an ice crystal tank 15.
Further, the feed liquid circulating unit comprises a feed liquid water tank and a feed liquid pump 2; the liquid in the feed liquid tank is pumped into a concentrated liquid tank 14 of the crystallizer 5 by the feed liquid pump 2, further, the feed liquid tank comprises a dilute solution tank 1 and a concentrated solution tank 10, the dilute solution tank 1 is used for conveying liquid into the crystallizer 5, and unfrozen liquid flows back into the concentrated solution tank 10 through a concentrated solution pipeline 12.
Further, the refrigerant circulating unit comprises a cooling water tank 8, a condenser 9, a refrigeration compressor 6 and a refrigerant pipeline 7; a condenser 9 is arranged in a cooling water tank 8, a refrigerant compressor is connected into the condenser 9 through a refrigerant pipeline 7, a refrigerant in the refrigerant pipeline 7 is cooled through the condenser 9, the cooling water tank 8 is connected with an ice crystal groove 15 in the crystallizer through a crystal ice pipeline 13 and used for placing frozen ice, effective heat exchange between the refrigerant in the refrigerant pipeline 7 and the ice separated from the crystallizer 5 is realized through the cold energy of the ice, the refrigerant cooled by the condenser 9 is circularly conveyed back into the crystallizer 5, and a throttling valve 11 is arranged on a pipeline conveyed back to the crystallizer 5.
Based on the interface progressive freezing concentration device for continuous deicing disclosed by the embodiment, the interface progressive freezing concentration method with continuous deicing is designed, and comprises the following steps:
the liquid is conveyed into a concentrated liquid tank 14 of the refrigerating unit through a feed liquid circulating unit; the liquid flows in a plurality of concentrate tanks 14;
high-pressure liquid refrigerant enters an inner shaft of a hollow shaft 19 in the crystallizer 5 through a refrigeration compressor 6, a refrigerant pipeline 7, a condenser 9 in a cooling water tank 8 and the refrigerant pipeline 7, then enters a heat exchange disc 17, and then flows out of a cavity formed by an outer shaft of the inner shaft to the refrigerant compressor;
when the refrigerant flows through the heat exchange plate 17, the refrigerant evaporates to absorb heat and exchanges heat with the liquid in the concentrated liquid tank 14, and the temperature of the plate wall of the heat exchange plate 17 drops; a part of the dilute solution flowing through the wall of the tray forms a flaky ice layer with a certain thickness on the wall of the tray;
liquid that does not freeze will flow back along the disc walls into the concentrate tank 10;
the flaky ice layer on the surface of the heat exchange disc 17 is scraped down into an ice crystal groove 15 of the crystallizer 5 under the action of a scraper connected with the heat exchange disc 17; discharged into the cooling water tank 8 of the refrigerant cycle unit through the crystal ice tank 15 via the crystal ice line 13.
In the actual production process, since the interfacial progressive freeze concentration method of the present embodiment is a long-term continuous production, in the process, a preset refrigerant temperature T is first set according to the raw material to be freeze-concentrated 0 And the rotating speed R of the heat exchange disc 0 The two parameters have important influence on the ice yield and ice scraping effect of concentration and extraction. This application discovers through the research, and the refrigerant temperature is low excessively, has increased the energy consumption, when improving manufacturing cost, still can make the ice sheet that forms too thick big and the texture is hard, hardly separates ice sheet and heat transfer dish smoothly through the scraper, also causes the scraper trouble simultaneously easily. If the temperature of the refrigerant is too high, it is difficult to form a good formed ice layer, and the effect of freeze concentration of the raw material is insufficient. Meanwhile, the concentration efficiency is reduced due to the fact that the rotating speed of the heat exchange plate is too low, and the ice layer is difficult to form and is hung on the wall of the plate if the rotating speed of the heat exchange plate is too high, so that the two parameters need different raw materials with preset reasonable values.
Meanwhile, due to the mutual coordination effect of the two parameters, in the long-time continuous production process, the temperature of the refrigerant is inevitably fluctuated to a certain extent in the recycling process and deviates from the original preset temperature (generally increased), and at the moment, if the refrigerant is stopped for adjustment, the refrigerant takes a long time, so that the production efficiency is obviously influenced. In this respect, the present application analyzes and studies mass production data during the cold-concentration process, and mainly analyzes the relationship between the refrigerant temperature and the rotation speed of the heat exchange plate, and the influence of the amount of ice produced by the refrigerant temperature and the rotation speed of the heat exchange plate and the hardness degree of the ice, and finds that the rotation speed of the heat exchange plate should be appropriately reduced when the refrigerant temperature rises to a certain temperature, so as to ensure the principle of forming a normal amount of ice layers which are easy to separate. The specific adjustment mode is carried out according to the following empirical formula:
in the formula, R 0 The value range is 15-40 r/min for the preset rotating speed. T is 0 Presetting the temperature for the refrigerant, wherein the value range is-7 to-30 ℃; alpha is a correction coefficient, the value range is 1.1-1.3, and the alpha is specifically selected according to different raw materials.
In addition, the preset temperature T of the refrigerant 0 The temperature of the refrigerant is set to be lower than the freezing point of the raw material at the initial concentration, only the temperature rise of the refrigerant is considered, if the temperature of the refrigerant drops, no adjustment is made, and the temperature threshold of the refrigerant is set to be T-T 0 If the temperature is higher than 5 ℃, namely the temperature of the refrigerant is higher than the preset temperature by more than 5 ℃, the machine is stopped for maintenance without adjusting the rotating speed.
The ice is stripped and then output to a cooling water tank 8, exchanges heat with the refrigerant in a condenser 9, and continuously circulates to output the refrigerant into the crystallizer 5.
Liquid in a dilute solution tank 1 of a feed liquid water tank in the feed liquid circulating unit is used for exchanging heat with a refrigerant to output an ice layer, and the dilute solution tank 1 is output to one end of a crystallizer 5 through a feed liquid pump 2; the uncrystallized feed liquid is discharged from the crystallizer 5 through a line into a concentrated solution tank 10.
The crystallizer 5 of the refrigerating unit is used for realizing circulating continuous crystallization and deicing.
As shown in fig. 1, an air compressor 4 is arranged above the crystallizer 5, and the air compressor 4 supplies air to the surface of the heat exchange plate 17; the left side of the crystallizer 5 is provided with a frequency modulation motor 3, the frequency modulation motor 3 is connected with a hollow shaft 19, the right side is connected with a refrigeration compressor 6, the refrigeration compressor 6 is connected with a condenser 9 in a cooling water tank 8 through a refrigerant pipeline 7, and refrigerant is output through the condenser 9 and returns to the crystallizer 5.
Example 1
This example is based on the above apparatus and method for practical experiments. Specifically, the watermelon juice with the soluble solid content of 8 degrees Bx is taken as a material, and the temperature of the refrigerant is set to be-17 ℃. The rotating speed of the heat exchange disc is controlled by adjusting the frequency converter, and the rotating speeds of the heat exchange disc which are respectively set are as follows: 15r/min,30r/min,45r/min,60r/min and 75r/min, and the ice yield under different rotating speeds is researched. After the fruit juice in the tank reaches the supercooling temperature and begins to generate ice crystals, timing for 10min, fishing out ice, filtering, centrifuging the ice crystals, weighing the obtained ice crystals, and measuring the content of soluble solids. Along with the increase of the rotating speed of the heat exchange plate, the ice output quantity of the watermelon juice is gradually reduced. When the rotating speed of the heat exchange disc is 15r/min and 30r/min, a large number of larger ice blocks are obtained; when the rotating speed of the heat exchange disc is 45r/min, the ice crystals are less agglomerated; after the rotating speed of the heat exchange disc is higher than 75r/min, no agglomeration phenomenon is found in ice crystals, the preset rotating speed of the disc is set to be 38r/min according to comprehensive consideration, the condition that the temperature of the refrigerant fluctuates and rises in the concentration process is adjusted by utilizing the empirical formula, and the rotating speed of the heat exchange disc is adjusted to be 25r/min when the temperature of the refrigerant reaches-14 ℃.
Example 2
This example is an actual experiment based on the above apparatus and method. Fresh orange juice was used as the material, the initial concentration of the fresh orange juice was 13 ° Bx, and after freezing at a refrigerant temperature of-1 ℃, no ice crystal formation was observed, indicating that this freezing temperature had not reached the freezing point of the orange juice at the initial concentration. When the freezing is carried out at the temperature of-2.5 to-3 ℃, soft and easily separated thin-layer ice is generated on the wall of the solution, when the freezing is carried out at the temperature of-10 ℃, an ice layer with larger thickness and hard texture is rapidly generated on the wall of the heat exchange plate, and according to comprehensive consideration, the temperature of the refrigerant is set to be-8 ℃ and the rotating speed is set to be 30r/min.
Example 3
This example is an actual experiment based on the above apparatus and method. The temperature of the refrigerant in the device is-20 deg.C, and lemon juice with concentration of 7.1 ° Brix can be concentrated to 18.1 ° Brix. The vacuum evaporation concentrated juice has obviously reduced total aroma component content and main characteristic aroma component content, and only retains 16% of all aroma components of the original juice, while the frozen concentrated juice retains 86%. Meanwhile, 77.58% of Vc in the original juice is preserved by freeze concentration of the lemon juice, and 61.35% of the original juice is preserved by vacuum evaporation concentration of the callback juice. The interface progressive freezing concentration method with continuous deicing has the outstanding advantages of keeping the total amount of original volatile substances, the relative content of each component and the nutrient content of the lemon juice.
In light of the foregoing description of the preferred embodiment of the present invention, it is to be understood that numerous changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The technical scope of the present invention is not limited to the content of the specification, and must be determined according to the scope of the claims.
Claims (10)
1. An interfacial progressive freeze concentration apparatus with continuous deicing, characterized in that: the system comprises a refrigerating unit, a feed liquid circulating unit and a refrigerant circulating unit;
the refrigerating unit comprises heat exchange disks, a hollow shaft, a concentrated liquid tank and an ice crystal tank, wherein the heat exchange disks are sleeved on the hollow shaft at equal intervals, the hollow shaft and the heat exchange disks rotate together under the driving of a driving device, the lower part of each heat exchange disk and the hollow shaft are positioned in the concentrated liquid tank, and the ice crystal tank is positioned on the side surface of the concentrated liquid tank;
the refrigerant circulating unit sends the refrigerant to the first channel of the hollow shaft, then enters the heat exchange disc for heat exchange, and then returns to the refrigerant circulating unit after being discharged from the second channel of the hollow shaft;
the feed liquid circulating unit sends feed liquid to one end of the concentrated liquid tank and then returns the feed liquid to the feed liquid circulating unit from the other end of the concentrated liquid tank.
2. An interfacial progressive freeze concentration apparatus with continuous deicing according to claim 1, wherein: the end of the hollow shaft is connected with the driving device.
3. An interfacial progressive freeze concentration apparatus with continuous deicing according to claim 1, wherein: the heat exchange plate is characterized by further comprising an air compressor, the air compressor is connected with a purging pipe, and the purging pipe purges liquid on the surface of the heat exchange plate into a concentrated liquid tank.
4. An interfacial progressive freeze concentration apparatus with continuous de-icing according to claim 1, characterized in that: the ice removing mechanism comprises an ice removing knife which is arranged above the ice crystal groove, the ice removing knife is inclined to the circular end face of the heat exchange disc, and the ice removing knife is used for scraping ice on the heat exchange disc to the ice crystal groove.
5. An interfacial progressive freeze concentration apparatus with continuous de-icing according to claim 1, characterized in that: the refrigerant circulating unit comprises a cooling water tank, a condenser, a refrigeration compressor and a refrigerant pipeline; a condenser is arranged in the cooling water tank, the refrigerant compressor is connected to an inlet of the condenser through a refrigerant pipeline, an outlet of the condenser is connected with a condensing agent inlet of the hollow shaft through a refrigerant pipeline, and an outlet of the hollow shaft condensing agent is connected with the refrigeration compressor.
6. An interfacial progressive freeze concentration apparatus with continuous deicing according to claim 1, wherein: the feed liquid circulating unit comprises a dilute solution tank and a concentrated solution tank, wherein the dilute solution tank is connected with the liquid inlet end of the concentrated liquid tank through a pump, and the concentrated solution tank is connected with the liquid outlet end of the concentrated liquid tank.
7. An interfacial progressive freeze concentration apparatus with continuous de-icing according to claim 1, characterized in that: the concentrated liquid tank and the ice crystal tank are formed by a shell and a partition plate positioned in the shell, and are independent from each other.
8. Method for condensation with an interfacial progressive freezing condensation plant with continuous deicing according to any one of claims 1 to 7, characterized in that:
liquid is conveyed into a concentrated liquid tank of the refrigerating unit through a liquid-liquid circulation unit;
delivering the refrigerant into the hollow shaft and the heat exchange plate of the refrigerating unit through the refrigerant circulating unit;
the refrigerant exchanges heat with the liquid in the heat exchange disc, and a sheet ice layer with a certain thickness is formed on the surface of the heat exchange disc;
the liquid without freezing flows back to the feed liquid circulation unit;
the ice removing mechanism is used for peeling the flaky ice layer in the refrigerating unit from the heat exchange disc unit to form ice blocks, the ice blocks fall into the ice crystal groove, and then the ice blocks are output to the refrigerant circulating unit.
9. A method of concentration according to claim 8, wherein: and the ice blocks are output to a cooling water tank of the refrigerant circulating unit.
10. A method of concentration according to claim 8, wherein: and the liquid which is not frozen flows back to the concentrated solution tank of the feed liquid circulating unit.
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|---|---|---|---|---|
| EP0031134A2 (en) * | 1979-12-19 | 1981-07-01 | Goudsche Machinefabriek B.V. | Continuously working crystallizer |
| CN2442199Y (en) * | 2000-09-08 | 2001-08-08 | 南通冷冻设备厂 | Ice making machine |
| CN202876425U (en) * | 2012-07-16 | 2013-04-17 | 清华大学 | Freezing-based solution regenerating device |
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2022
- 2022-07-08 CN CN202210801714.7A patent/CN115228128A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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