Large-capacity high-performance progressive freeze concentration production equipment capable of realizing continuous multi-stage concentration

Abstract

The invention relates to large-capacity high-performance progressive freeze concentration production equipment capable of realizing continuous multi-stage concentration. The large-capacity high-performance progressive freeze concentration production equipment comprises four groups of concentration tanks, three refrigerating systems, three low-temperature secondary refrigerant tanks, two normal-temperature secondary refrigerant tanks and an intelligent operation control system, the concentration tanks are 150-500L high-capacity flat cuboid-like progressive freezing concentration tanks with stainless steel sandwich structures, and are divided into four groups to be arranged in sequence. And the intelligent operation control unit is associated with the mechanisms to form functions such as operation instruction and information feedback automatic operation, remote control and the like. According to the equipment disclosed by the invention, one-stage to multi-stage continuous freezing concentration of feed liquid is realized in an interactive switching operation mode through a sequence that multiple tanks are connected in parallel to form groups and multiple groups are connected in series; the bottleneck problems of intermittent operation, low concentration efficiency, difficulty in realization of production and application and the like of a traditional progressive freeze concentration device are solved by a unique tank body structure and an ingenious serial combination technical scheme, deicing is convenient, the operation energy consumption is remarkably saved, and the concentration production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of environmentally friendly low-temperature concentration intelligent equipment, and in particular to a large-capacity, high-performance progressive freezing concentration production equipment capable of continuous multi-stage concentration. Background Art

[0002] Freeze concentration is a high-tech technology commonly used in the food, health products, biopharmaceuticals and environmental protection industries to operate below the freezing point of aqueous solutions and achieve liquid material concentration. Compared with conventional concentration technologies such as evaporation concentration and vacuum concentration, it has great advantages in effectively protecting and recovering the nutrients, bioactive ingredients, 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 solutions, freeze concentration can be divided into two major technical systems: suspension and progressive. Suspension freeze concentration adopts the operation mode of multiple ice crystal formation, growth and regular removal. It was first studied in Western developed countries. Especially after solving the efficient ice crystal removal technology, the concentration efficiency has been greatly improved, and the equipment performance has become mature. It has been commercialized in the fields of food, biopharmaceuticals, environmental wastewater treatment, etc. for more than 40 years, but it has defects such as complex equipment structure, high manufacturing cost and difficulty in popularization and promotion. The operating principle of progressive freeze concentration is different from that of suspension freeze concentration. The aqueous solution grows from ice crystals to a single thick ice layer on the cold wall surface of the concentration device. After the ice layer is removed, the aqueous solution is concentrated. Therefore, the significant advantage of progressive freeze concentration is that it does not require complex deicing equipment, the deicing operation is relatively simple, and the equipment cost is lower. It has now become another important development direction for freeze concentration equipment. At present, progressive freeze concentration has evolved into concentration devices based on different operating methods, such as round tanks, circulation pipes, falling film sheets and rotary drums.

[0003] However, since some technical bottlenecks of progressive freeze concentration have not been truly resolved, there is still a lack of large-capacity progressive freeze concentration equipment suitable for large-scale and efficient production both at home and abroad. These technical bottlenecks include: (1) Progressive freeze concentration uses a single ice crystal to grow into a thick ice layer, thereby reducing the proportion of liquid water in the solution and achieving an increase in the concentration of the feed liquid. Since the thermal conductivity of solid ice is only about 1 / 4 of that of liquid water, the thicker the ice layer is during the freeze concentration process, the more difficult it is 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 is formed on the cold wall of the concentration device, the thickening rate of the ice layer on the solution side will begin to be affected; when a ≥10cm thick ice layer is formed on the cold wall of the concentration device, the thermal resistance of the ice layer will become a limiting factor for heat transfer in the concentration tank. It takes at least 3h for the ice layer on the solution side to thicken by 1cm, which seriously affects the freeze concentration process. (2) In order to save manufacturing costs, traditional progressive freeze concentration tanks often adopt a circular tank design. However, when the capacity of the circular tank increases to a certain extent, under the condition of appropriate tank height, the radius of the concentration tank can easily exceed 10cm (for example, when the capacity of the circular concentration tank reaches 150L, ​​its radius will exceed 25cm). This means that even if the conventional 2-3 times concentration ratio is achieved, the thickness of the ice layer on the inner wall of the circular concentration tank will seriously affect the freeze concentration process, not only consuming more operating energy of the equipment, but also the concentration efficiency is not ideal. (3) The current progressive freeze concentration equipment is basically designed as a single tank intermittent operation mode. After each stage of freeze concentration is completed, the machine must be shut down and thawed and de-iced before the next stage of freeze concentration can be carried out. This non-continuous operation mode also seriously affects production efficiency. For example, the disclosed progressive freezing concentration device technical solutions such as "CN108176074A A progressive freezing concentration device and freezing concentration method with a double-sandwich structure", "CN210964869U-A progressive freezing concentration device with a double-sandwich structure", "CN208340156U A tubular circulation freezing concentration device containing a heat transfer buffer layer", and "CN209219223U A progressive freezing concentration device for liquid food" all belong to a single small-capacity round tank or round tube intermittent freezing concentration device with limited operating efficiency; and the ice layer formed on the inner wall of the round tank or round tube concentrator is a cylindrical ice ring centered on the longitudinal axis of the round tank or round tube. These cylindrical ice rings are irregular fan-shaped after breaking and are not easy to peel off from the tank, which makes it difficult to remove and increases labor intensity.For example, the patents disclosed in "CN108477441A A device and method for preparing concentrated juice by continuous freezing" and "CN202281416U A micro device for rapidly and continuously preparing cooling and freezing liquids" which claim to be able to achieve continuous concentration are also progressive concentration devices containing only a single freezing concentration tank, which cannot truly and effectively realize continuous multi-stage progressive freezing concentration operations, let alone rapid thawing and deicing; the progressive freezing concentration device capable of continuous multi-stage concentration described in the disclosed "CN113769432A A fully automatic freezing concentration device and a process for preparing concentrated liquids" contains two freezing concentration barrels, which in a certain sense can only achieve continuous freezing concentration from the first to the second stage, but cannot achieve rapid thawing and deicing, and the actual operation efficiency is not high. Therefore, for large-capacity progressive freezing concentration production equipment, if the volume capacity of the traditional concentration tank is simply expanded without changing the intermittent operation mode, it cannot be realized in practical application. In the field of progressive freezing concentration equipment, only by solving the above-mentioned technical bottleneck problems can a progressive freezing concentration equipment with excellent performance be designed and manufactured. Summary of the invention

[0004] Based on this, the purpose of this application is to use a large-capacity flat rectangular structure freezing concentration tank, and through a combination of multiple tanks in parallel and multiple groups in series, provide a high-performance progressive freezing concentration equipment with large-scale production application value and continuous multi-stage concentration, which can achieve higher concentration efficiency and lower operating energy consumption than conventional circular concentration tanks and inefficient intermittent progressive freezing concentration equipment, and can be operated from one stage to multiple stages of continuous freezing concentration.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions:

[0006] A large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration, comprising four groups of eight concentration tanks (a1, a2, a3, a4, b1, b2, c and d concentration tanks), three refrigeration systems (A refrigeration system, B refrigeration system and C refrigeration system), three low-temperature refrigerant tanks (low-temperature refrigerant A tank, low-temperature refrigerant B tank and low-temperature refrigerant C tank), two normal temperature refrigerant tanks (normal temperature refrigerant I tank and normal temperature refrigerant II tank) and core structures such as an intelligent operation control system.

[0007] The four groups of eight concentration tanks are all flat rectangular progressive freezing concentration tanks with stainless steel sandwich structures, and each includes a matching temperature recording probe, tank cover, LED lighting, real-time camera device and stirring device.

[0008] The four groups of eight concentration tanks are all 150L to 500L large-capacity stainless steel sandwich flat rectangular progressive freezing concentration tanks, namely a1, a2, a3, a4, b1, b2, c and d concentration tanks, with a total capacity ranging from 1200L to 4000L. The a1, a2, a3, a4, b1, b2 and c concentration tanks have the same capacity specifications. Once the capacity specifications are determined, the capacity of the d concentration tank is 50% to 100% of the c concentration tank; the a1, a2, a3 and a4 concentration tanks are connected in parallel to form the first group, the b1 and b2 concentration tanks are connected in parallel to form the second group, the c concentration tank is the third group, and the d concentration tank is the fourth group.

[0009] The four groups of eight concentration tanks have two stainless steel plates on the side of the middle of the flat rectangular inner cavity of the stainless steel sandwich structure, which are combined with a stainless steel semi-cylindrical shell at each end of the tank body. The diameter and height of the stainless steel semi-cylindrical shell at both ends are equal to the spacing and height of 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, which is welded together. Taking into account the maximum concentration efficiency and operational convenience, the size range of the two stainless steel plates in the middle of the tank body of the four groups of eight concentration tanks is: 80cm to 150cm long, 70cm to 120cm high, and the distance between the two plates is 18cm to 30cm. The outer layer of the four groups of eight concentration tanks is a stainless steel outer interlayer. According to the heat transfer requirements of concentration tanks of different volumes, the thickness of the coolant in the outer interlayer ranges from 5cm to 10cm.

[0010] The bottom of the outer interlayer of the four groups of eight concentration tanks each contains two refrigerant inlets, and the upper part of the outer interlayer contains two refrigerant outlets; the two refrigerant inlets are respectively installed at the obliquely symmetrical tangent positions of the junction of the semi-cylindrical outer interlayer at both ends of the freezing concentration tank body and the bottom of the rectangular outer interlayer, and the two refrigerant outlets are respectively installed at the obliquely symmetrical tangent positions of the junction of the semi-cylindrical outer interlayer at both ends of the freezing concentration tank body and the upper end of the rectangular outer interlayer.

[0011] One to two temperature recording probes are installed in the outer interlayer of the four groups of eight concentration tanks; two temperature recording probes are installed inside the tank, one of which is installed close to the middle of the inner wall of one of the two semi-cylinders to record the temperature change process of the solution close to the inner wall of the tank, and the other is installed at the bottom of the tank close to the discharge port to record the temperature change process of the solution in the center of the tank.

[0012] The shape of the tank covers of the four groups of eight concentration tanks is consistent with the size of the tank edges at the upper ends of the freezing concentration tank bodies, and are fixed and sealed by sealing rings and buckles; an LED lighting lamp and a real-time camera device are installed on the top of the tank cover, which can observe, photograph or record the freezing concentration process and ice ring growth process in real time.

[0013] The four groups of eight concentration tanks are equipped with three stirring devices, which are respectively installed in the middle of the first, third and fifth dividing lines of the six equal parts of the transverse central axis of the tank cover. The stirring motor and stirring paddle are installed in the same way as above, but the direction of rotation of the three stirring motors is reversed. The upper end of the stirring paddle is connected to the stirring motor shaft through a movable clamp, and the lower end of the stirring paddle is connected to the center of the movable disc at the bottom of the tank. The stirring paddle can be removed when necessary.

[0014] The three low-temperature refrigerant tanks are connected with the three refrigeration systems and corresponding heat exchangers through their own matching circulation pumps, valves and pipelines to form independent low-temperature refrigerant circulations, and can continuously adjust the required temperature of the refrigerants in the three low-temperature refrigerant tanks respectively; the three low-temperature refrigerant tanks are simultaneously connected with the two refrigerant inlets and two refrigerant outlets of the outer interlayer of the four groups of eight concentrating tanks through their own matching circulation pumps, valves and pipelines to form independent low-temperature refrigerant circulations, and realize the frozen concentration of the liquid in the four groups of eight concentrating tanks respectively.

[0015] Furthermore, the low-temperature refrigerant tank A forms an independent low-temperature refrigerant circulation with the A refrigeration system and its supporting heat exchanger through its own supporting circulation pump, valves and pipelines, and can continuously adjust the required temperature of the refrigerant in the low-temperature refrigerant tank A; the low-temperature refrigerant tank A is also connected to the two refrigerant inlets and two refrigerant outlets of the outer layer of each of the first group of four concentrators through its own supporting circulation pump, valves and pipelines to form an independent low-temperature refrigerant circulation for the first group of four concentrators, thereby realizing the first-level freeze-concentration of the initial feed liquid by the first group of four concentrators.

[0016] Furthermore, the low-temperature coolant tank A is also connected to the two coolant inlets and two coolant outlets of the outer layer of each of the second group of two concentrators through its own supporting circulation pump, valves and pipelines to form an independent low-temperature coolant circulation for the second group of two concentrators, thereby realizing the secondary freeze-concentration of the first-level frozen concentrate completed by the second group of two concentrators on the first group of four concentrators.

[0017] Furthermore, the low-temperature refrigerant C tank forms an independent low-temperature refrigerant circulation with the C refrigeration system and its supporting heat exchanger through its own supporting circulation pump, valves and pipelines, and can continuously adjust the required temperature of the refrigerant in the low-temperature refrigerant C tank; the low-temperature refrigerant C tank is also connected to the two refrigerant inlets and two refrigerant outlets of the outer interlayer of the third and fourth groups of corresponding concentration tanks through its own supporting circulation pump, valves and pipelines to form an independent low-temperature refrigerant circulation for the third and fourth groups of corresponding concentration tanks; the third group of concentration tanks can perform tertiary freeze-concentration on the secondary frozen concentrated liquid completed by the two concentration tanks of the second group; the fourth group of concentration tanks can perform quaternary freeze-concentration on the tertiary frozen concentrated liquid completed by the third group of concentration tanks.

[0018] The normal temperature refrigerant I tank and the normal temperature refrigerant II tank, through their own matching circulation pumps, pipelines and valves, only form four independent normal temperature refrigerant cycles with the outer interlayers of the first group of four concentrators, the second group of two concentrators, and the third and fourth groups of one concentrator each; the normal temperature refrigerant I tank and the normal temperature refrigerant II tank are both equipped with heaters and circulation pumps, which can adjust the refrigerant in the tank to a normal temperature state above 0°C. When the freeze concentration of the first group of four concentrators, the second group of two concentrators, and the third and fourth groups of one concentrator each is completed, the corresponding independent normal temperature refrigerant cycles can be used to quickly thaw the ice layer on the joint surface between the inner wall of the corresponding concentrator tanks in the first group, the second group, the third group and the fourth group, so as to facilitate the detachment and de-icing of the ice ring.

[0019] The four groups of eight concentration tanks are all large-capacity flat rectangular structures with different capacity specifications ranging from 150L to 500L. The half-width size of the rectangular section in the tank cavity of these concentration tanks and the radius of the semi-cylindrical semi-circular section at both ends are both in the range of 9cm to 15cm. This tank cavity structure can limit the thickest ice layer formed on each single cold wall surface in the tank to ≤9cm to 15cm. Under the same concentration ratio, the thickness of the ice layer on these flat rectangular progressive freezing concentration tanks will be much smaller than the ice layer thickness of 12.5cm to 32.5cm of the circular progressive freezing concentration tank of the same volume. The thinner ice layer will significantly improve the heat transfer efficiency between the inner wall of the concentration tank and the liquid in the center of the tank, thereby greatly shortening the freezing concentration time, improving the concentration efficiency and reducing the energy consumption of equipment operation.

[0020] The intelligent operation control system is composed of an operation panel, a data processing and automatic control module, a recording storage, and an electrical control element; the electrical control element is respectively connected with three refrigeration systems (A refrigeration system, B refrigeration system and C refrigeration system), three low-temperature coolant tanks (low-temperature coolant A tank, low-temperature coolant B tank and low-temperature coolant C tank), two normal temperature coolant tanks (normal temperature coolant I tank and normal temperature coolant II tank), four groups of eight concentration tanks (a1, a2, a3, a4, b1, b2, c and d concentration tanks) and their corresponding supporting heat exchangers, circulating pumps, valves, temperature probes, stirring devices, LED lighting and real-time camera devices, so as to realize the setting and adjustment of freeze concentration operation parameters, automatic operation of the whole machine, remote monitoring, and real-time display, storage and export of operation parameters, data and image data.

[0021] The four groups of eight concentration tanks (a1, a2, a3, a4, b1, b2, c and d concentration tanks) are used in combination with three low-temperature coolant tanks (low-temperature coolant A tank, low-temperature coolant B tank and low-temperature coolant C tank), two normal temperature coolant tanks (normal temperature coolant I tank and normal temperature coolant II tank), three refrigeration systems (A refrigeration system, B refrigeration system and C refrigeration system) and an operation control system. The four groups of concentration tanks can independently run the freeze concentration program and the thawing program, and through the four groups of concentration tanks connected in series in sequence and interactively switching operations and other modes, one to multiple levels of continuous freeze concentration of the feed liquid can be achieved until it is concentrated to the target concentration or a maximum ultimate concentration of 50% (w / w).

[0022] In particular, when the initial feed liquid reaches the target concentration after completing the first-stage freeze concentration, the first, second, third and fourth groups of 8 concentration tanks can simultaneously perform the first-stage freeze concentration. At this time, the maximum one-time processing capacity of the feed liquid can reach 4.0t.

[0023] In particular, when the initial feed liquid needs to complete secondary freeze concentration to reach the target concentration, the first and second groups of 6 concentration tanks can simultaneously perform primary freeze concentration. At this time, the equipment can process a maximum of 3.0t of feed liquid at one time; the third and fourth groups of 2 concentration tanks complete the secondary freeze concentration of the primary concentrate; and during the next stage of freeze concentration, the thawing and deicing operations of the ice ring of the previous stage are completed simultaneously.

[0024] In particular, when the initial liquid feed needs to complete three-stage freeze concentration to reach the target concentration, the first group of 4 concentration tanks can simultaneously perform the first-stage freeze concentration. At this time, the maximum one-time processing capacity of the equipment for the liquid feed can reach 2.0t; the second group of 2 concentration tanks complete the second-stage freeze concentration of the first-stage concentrate, and the third or fourth group of concentration tanks complete the tertiary freeze concentration of the second-stage concentrate; and during the next stage of freeze concentration, the thawing and de-icing operations of the ice ring of the previous stage are completed simultaneously.

[0025] In particular, when the initial feed liquid needs to complete four stages of freeze concentration to reach the target concentration, the first group of 4 concentration tanks can simultaneously perform the first stage of freeze concentration. At this time, the maximum one-time processing capacity of the equipment for the feed liquid can reach 2.0t; correspondingly, the second group of 2 concentration tanks complete the second stage of freeze concentration of the first stage concentrated liquid, and the third group of concentration tanks complete the third stage of freeze concentration of the second stage concentrated liquid, and finally the fourth group of concentration tanks completes the fourth stage of freeze concentration of the third stage concentrated liquid; and during the next stage of freeze concentration, the thawing and de-icing operations of the ice ring of the previous stage are completed simultaneously.

[0026] In particular, when the initial feed liquid needs to complete four or more stages of freeze concentration to reach the target concentration, the four groups of large-capacity concentration can be based on the series sequence of each group, starting from the four-stage freeze concentrate of the previous cycle, and through a new round of series sequence of each group, five or more stages of freeze concentration are successively completed in sequence until the target concentration or the ultimate concentration of up to 50% (w / w) is reached.

[0027] In the freeze concentration stage, the operation panel can independently set the freeze concentration temperature range and corresponding operation time for each group of four groups of eight concentration tanks. Furthermore, the descending temperature range and corresponding operation time for freeze concentration of the four groups of eight concentration tanks can be independently set in a gradient segmented cooling sequence of one, two, three, four and five stages; further, the intelligent operation control system can automatically execute the freeze concentration process parameters of the first, second, third, fourth to fifth stages set for each group of the four groups of eight concentration tanks.

[0028] In the thawing stage after the freeze concentration is completed, the operation panel can independently set the thawing temperature and thawing time of the ice rings of each of the four groups of eight concentration tanks. Furthermore, when any group of the four groups of eight concentration tanks needs to be thawed after the freeze concentration is completed, the thawing procedure can be executed separately, and the intelligent operation control system can automatically operate the heater and circulation pump of the corresponding normal temperature coolant tank, and synchronously start the normal temperature coolant circulation between the outer interlayer of the corresponding group of concentration tanks and the corresponding normal temperature coolant tank to implement the thawing of the ice rings.

[0029] Compared with the traditional single-tank intermittent freeze concentration equipment, the concentration efficiency and production efficiency of the equipment can be significantly improved in the following way. When the equipment uses four groups of eight concentration tanks to perform one-stage to multi-stage freeze concentration on the relevant liquid, the concentrate of the previous stage can be immediately transported to the next group of concentration tanks, seamlessly docked and perform the next stage of freeze concentration, the concentration process is continuous, and the concentration efficiency is improved; further, after the freeze concentration of any group of the four groups of eight concentration tanks of the equipment is completed, the independent normal temperature refrigerant circulation can be synchronously switched to perform rapid ice ring thawing and complete the deicing operation, which significantly improves the production efficiency.

[0030] The equipment performs one-stage to multiple-stage continuous freeze concentration on the relevant liquid, while saving operation time and energy consumption, and improving the concentration production efficiency, which is achieved through the following steps:

[0031] Operation step 1: First, complete the first-level freeze concentration and de-icing operation of the initial liquid in the first group of 4 concentration tanks (a1, a2, a3 and a4 concentration tanks). ① Turn on the power of the equipment and turn on the intelligent operation control system; transport the initial liquid to the first group of 4 concentration tanks to reach the corresponding volume. ② Set the first to fifth freeze concentration temperature ranges and the operating time parameters of each section for the first group of 4 concentration tanks on the operation panel, start the freeze concentration of the first group of 4 concentration tanks, and set the stirring time of the corresponding concentration tanks and start stirring. ③ Open the video to observe the thickening of the ice layer. When the first group of 4 concentration tanks automatically complete the first to fifth continuous freeze concentration procedures, or the ice layer in the first group of 4 concentration tanks is close to the stirring blade, stop stirring, open the tank cover and remove the stirring paddle, and take a small amount of concentrated liquid from each of the first group of 4 concentration tanks to determine its concentration. ④When the concentrate still does not reach the expected concentration, the first-level frozen concentrate is transported to the second group of two concentration tanks (b1 and b2 concentration tanks), and the first-level frozen concentration is terminated at the same time; when the expected concentration has been reached, the frozen concentration is terminated and the second-level frozen concentration is no longer performed. ⑤At the same time, the thawing temperature and thawing time of the first group of four concentration tanks are set, and the heater and circulation pump of the normal temperature refrigerant tank I and the normal temperature refrigerant circulation of the outer interlayer of the four concentration tanks are started. After the ice rings of the four concentration tanks are thawed, the outer ring of the ice ring will be separated from the inner wall of the corresponding tank. Take out all the ice rings in the first group of four concentration tanks, break them, and use the matching centrifuge to recover the entrained liquid in the ice cubes. The recovered entrained liquid can be added to the second group of two concentration tanks for mixing, and the remaining first-level white ice can be discarded. ⑥Furthermore, before the first-level frozen concentration reaches the expected target concentration and ends the operation of the whole machine, the first-level frozen concentration process data can be exported using a U disk, the power is turned off, and the equipment is cleaned. At this point, the first-level frozen concentration of the initial liquid and the deicing operation in the tanks of the first group of four concentration tanks are all completed.

[0032] Operation step 2: Complete the secondary freeze concentration and deicing operation of the first-stage frozen concentrate in the second group of two concentration tanks (b1 and b2 concentration tanks). ① Refer to the center temperature in the tank before the end of the previous freeze concentration, set the freeze concentration temperature range of the second group of two concentration tanks from one to five stages and the operating time parameters of each stage on the operation panel, start the freeze concentration of the second group of two concentration tanks, and set the stirring time and start stirring at the same time. ② Open the video to observe the thickening of the ice layer. When the second group of two concentration tanks automatically complete the first to fifth stages of continuous freeze concentration procedures, or when the ice layer in the second group of two concentration tanks approaches the stirring blade, stop stirring, open the tank cover and remove the stirring blade, and take a small amount of concentrated liquid from each of the second group of two concentration tanks to determine its concentration. ③ When the concentrate still does not reach the expected concentration, end the secondary freeze concentration, transfer all the secondary freeze concentrate to the third group c concentration tank, and perform operation step 3 to complete the third group c concentration tank The three-stage freeze concentration; when the expected concentration has been reached, the freeze concentration is terminated and the three-stage freeze concentration is no longer performed. ④At the same time, set the thawing temperature and thawing time of the second group of two concentration tanks, start the heater and circulation pump of the normal temperature refrigerant tank I and the circulation of the normal temperature refrigerant in the outer interlayer of the second group of two concentration tanks, and after the ice rings of the second group of two concentration tanks are thawed, the outer ring of the ice ring will be separated from the inner wall of the corresponding tank. Take out all the ice rings in the second group of two concentration tanks, break them, and use the matching centrifuge to recover the entrained liquid in the ice cubes. The recovered entrained liquid can be added to the third group C concentration tank for mixing, and the remaining secondary white ice can be discarded. ⑤Furthermore, when the secondary freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the secondary freeze concentration process data can be exported using a U disk, the power is turned off, and the equipment is cleaned. At this point, the secondary freeze concentration of the first frozen concentrate by the second group of two concentration tanks and the deicing operation in the tank are all completed.

[0033] Operation step three: Complete the third-stage freeze concentration and deicing operation of the third group C concentration tank on the second-stage frozen concentrate. ① Refer to the center temperature of the tank before the end of the previous stage of freeze concentration, set the freeze concentration temperature range of the third group C concentration tank from one to five stages and the operating time parameters of each stage on the operation panel, start the freeze concentration of the third group C concentration tank, and set the stirring time and start stirring. ② Open the video to observe the thickening of the ice layer. When the third group C concentration tank automatically completes the first to fifth stages of continuous freeze concentration procedures, or the ice layer in the third group C concentration tank approaches the stirring blade, stop stirring, open the tank cover and remove the stirring blade, and take a small amount of concentrated liquid from the third group C concentration tank to determine its concentration. ③ When the concentrated liquid still does not reach the expected concentration, end the third-stage freeze concentration, and transfer all the third-stage frozen concentrate to the fourth group D concentration tank, and perform operation step 4 to complete the fourth-stage freeze concentration of the fourth group D concentration tank; when the expected concentration has been reached, end the freeze concentration and no longer perform the fourth-stage freeze concentration. ④At the same time, set the thawing temperature and thawing time of the third group c concentration tank, start the normal temperature refrigerant II tank heater and circulation pump and the third group c concentration tank outer interlayer normal temperature refrigerant circulation, and after the third group c concentration tank ice ring is thawed, the outer ring of the ice ring will be separated from the inner wall of the corresponding tank. Take out all the ice rings in the third group c concentration tank, break them, and use the matching centrifuge to recover the entrained liquid in the ice cubes. The recovered entrained liquid can be added to the fourth group d concentration tank for mixing, and the remaining three-level white ice can be discarded. ⑤Furthermore, when the three-level freeze concentration reaches the expected target concentration and ends the operation of the whole machine, the three-level freeze concentration process data can be exported using a U disk, the power is turned off, and the equipment is cleaned. At this point, the three-level freeze concentration of the second-level frozen concentrate by the third group c concentration tank and the deicing operation in the tank are all completed.

[0034] Operation step 4: Complete the fourth-stage freeze concentration and deicing operation of the third-stage frozen concentrate in the fourth group d concentration tank. ① Refer to the center temperature in the tank before the end of the previous stage of freeze concentration, set the first to fifth stage freeze concentration temperature range and the operating time parameters of each stage of the fourth group d concentration tank on the operation panel, start the fourth group d concentration tank freeze concentration, and set the stirring time and start stirring. ② Open the video to observe the thickening of the ice layer. When the fourth group d concentration tank automatically completes the first to fifth stage continuous freeze concentration program, or the ice layer in the fourth group d concentration tank approaches the stirring blade, stop stirring, open the tank cover and remove the stirring blade, and take a small amount of concentrated liquid from the fourth group d concentration tank to determine its concentration. ③ When the concentrate still does not reach the expected concentration, end the fourth-stage freeze concentration, collect all the fourth-stage freeze concentrate in the temporary storage tank to prepare for the fifth-stage freeze concentration; when the expected concentration has been reached, end the freeze concentration and no longer perform the fifth-stage freeze concentration. ④At the same time, set the thawing temperature and thawing time of the fourth group d concentration tank, start the heater and circulation pump of the normal temperature refrigerant II tank and the circulation of the normal temperature refrigerant in the outer interlayer of the fourth group d concentration tank, and after the ice ring of the fourth group d concentration tank is thawed, the outer ring of the ice ring will be separated from the inner wall of the corresponding tank. Take out all the ice rings in the fourth group d concentration tank, break them, and use the matching centrifuge to recover the entrained liquid in the ice cubes. The recovered entrained liquid can be added to the temporary storage tank for mixing, and the remaining four-level white ice can be discarded. ⑤Furthermore, when the four-level freeze concentration reaches the expected target concentration and ends the operation of the whole machine, the four-level freeze concentration process data can be exported using a U disk, the power is turned off, and the equipment is cleaned. At this point, the four-level freeze concentration of the third-level frozen concentrate by the fourth group d concentration tank and the deicing operation in the tank are all completed.

[0035] Operation step five: If the four-stage frozen concentrate still cannot reach the expected target concentration, a new round of the above-mentioned one, two, three, and four steps can be repeated by using the series sequential cycle of the first, second, third, and fourth groups of concentration tanks, and a new round of one-stage, two-stage, three-stage, and four-stage continuous freeze concentration is performed on the initial liquid in turn. After collecting a sufficient volume of the four-stage frozen concentrate, the first, second, third, and fourth groups of concentration tanks of this equipment are used in a series sequential cycle, starting from the four-stage frozen concentrate, and five or more freeze concentration operations are performed in sequence to finally reach the target concentration.

[0036] In particular, for progressive freeze concentration, in actual situations, most feed solutions with suitable concentrations usually only need to complete second to fourth stage freeze concentration to reach the desired target concentration or a maximum final concentration of 50% (w / w); only some feed solutions with extremely low initial concentrations require more than four stages of freeze concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a structural layout diagram of a large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration;

[0038] In the figure: 1- intelligent operation control system; 2- A refrigeration system; 3- B refrigeration system; 4- C refrigeration system; 5- low temperature coolant A tank; 6- low temperature coolant B tank; 7- low temperature coolant C tank; 8- normal temperature coolant I tank; 9- normal temperature coolant II tank; 10, 11, 12, 13, 14, 15, 16, 17- respectively a1 concentration tank, a2 concentration tank, a3 concentration tank, a4 concentration tank, b1 concentration tank, b2 concentration tank, c concentration tank and d concentration tank; 18- temporary storage tank; 19, 20 and 21- respectively A concentration tank Heat exchanger A, heat exchanger B and heat exchanger C; 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34 and 35-respectively coolant circulation pump No. 1, pump No. 2, pump No. 3, pump No. 4, pump No. 5, pump No. 6, pump No. 7, pump No. 8, pump No. 9, pump No. 10, pump No. 11, pump No. 12, pump No. 13 and pump No. 14; 36, 37, 38 and 39-respectively liquid pump No. 1, pump No. 2, pump No. 3 and pump No. 4; 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56 and 57 are respectively No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7, No. 8, No. 9, No. 10, No. 11, No. 12, No. 13, No. 14, No. 15, No. 16, No. 17 and No. 18 refrigerant valves; 58, 59, 60, 61, 62, 63, 64 and 65 are respectively No. 1, No. 2, No. 3, No. 4, No. 5, No. 6, No. 7 and No. 8 liquid valves; 66, 67 and 68 are respectively No. 1 heater, No. 2 heater and Heater No. 3; 10-1, 10-2, 10-3, 11-1, 11-2, 11-3, 12-1, 12-2, 12-3, 13-1, 13-2, 13-3, 14-1, 14-2, 14-3, 15-1, 15-2, 15-3, 16-1, 16-2, 16-3, 17-1, 17-2, 17-3 - are the 3 stirring devices on the a1 concentration tank, a2 concentration tank, a3 concentration tank, a4 concentration tank, b1 concentration tank, b2 concentration tank, c concentration tank and d concentration tank respectively.

[0039] Figure 2 The front and top views of the flat rectangular parallelepiped freeze concentration tank with a large capacity of 150L to 500L;

[0040] In the figure: 69 - inner wall of the tank; 70 - outer wall of the tank interlayer; 71 - interlayer temperature probe; 72 - stirring paddle; 73, 79 - upper outlet pipe of the coolant; 74 - liquid inlet pipe; 75 - tank cover; 76 - camera device; 77 - stirring motor; 78 - LED lamp; 80 - tank inner wall temperature probe; 81, 85 - lower inlet pipe of the coolant; 82 - tank bottom temperature probe; 83 - tank bottom discharge pipe; 84 - concave tank bottom.

[0041] Figure 3 The invention discloses a multi-stage continuous freeze concentration process operation flow of a large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration. DETAILED DESCRIPTION

[0042] Example 1: Large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0044] See also Figure 1 , Figure 2 As shown, the large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration has its core structural components including an intelligent operation control system 1, a refrigeration system A 2, a refrigeration system B 3, a refrigeration system C 4, a low-temperature coolant A tank 5, a low-temperature coolant B tank 6, a low-temperature coolant C tank 7, a normal temperature coolant I tank 8, a normal temperature coolant II tank 9, and four groups of eight concentration tanks (respectively a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12, a4 concentration tank 13, b1 concentration tank 14, b2 concentration tank 15, c concentration tank 16 and d concentration tank 17).

[0045] Furthermore, the A refrigeration system 2 is connected to the low-temperature refrigerant A tank 5 through the A heat exchanger 19 and the refrigerant circulation pump No. 1 22, so as to form a low-temperature refrigerant circulation, which can continuously adjust the required temperature of the refrigerant in the low-temperature refrigerant A tank 5; at the same time, the low-temperature refrigerant A tank 5 is connected to the two refrigerant inlets and two refrigerant outlets of the outer layer of each of the first group a1 concentrator tank 10, a2 concentrator tank 11, a3 concentrator tank 12 and a4 concentrator tank 13 through the refrigerant circulation pump No. 4 25, the refrigerant circulation pump No. 5 26, the refrigerant valve No. 1 40, the refrigerant valve No. 2 41, the refrigerant valve No. 3 42 and the pipeline, respectively, to form an independent low-temperature refrigerant circulation for the first group of concentrators, so as to realize the first-level freeze concentration of the initial feed liquid by the first group of concentrators.

[0046] Furthermore, the B refrigeration system 3 is connected to the low-temperature refrigerant B tank 6 through the B heat exchanger 20 and the refrigerant circulation pump No. 2 23, forming a low-temperature refrigerant circulation, which can continuously adjust the required temperature of the refrigerant in the low-temperature refrigerant B tank 6; at the same time, the low-temperature refrigerant B tank 6 is connected to the two refrigerant inlets and two refrigerant outlets of the outer layer of the second group b1 concentrator tank 14 and b2 concentrator tank 15 through the refrigerant circulation pump No. 6 27 and the refrigerant valve No. 4, the refrigerant valve No. 5 44 and the pipeline respectively to form an independent low-temperature refrigerant circulation for the second group of concentrators, thereby realizing the secondary freeze-concentration of the initial feed liquid by the second group of concentrators.

[0047] Furthermore, the C refrigeration system 4 is connected to the low-temperature refrigerant C tank 7 through the C heat exchanger 21 and the refrigerant circulation pump No. 3 24 to form a low-temperature refrigerant circulation, which can continuously adjust the required temperature of the refrigerant in the low-temperature refrigerant C tank 7; the low-temperature refrigerant C tank 7 is simultaneously connected to the two refrigerant inlets and two refrigerant outlets of the outer layer of the third group c concentrator 16 through the refrigerant circulation pump No. 7 28, the refrigerant valve No. 6 45, the refrigerant valve No. 7 46 and the pipeline to form an independent low-temperature refrigerant circulation of the third group c concentrator 16, thereby realizing the three-stage freezing and concentration of the initial liquid by the third group of concentrators; at the same time, the low-temperature refrigerant C tank 7 is simultaneously connected to the two refrigerant inlets and two refrigerant outlets of the outer layer of the fourth group d concentrator 17 through the refrigerant circulation pump No. 8 29, the refrigerant valve No. 8 47, the refrigerant valve No. 9 48 and the pipeline to form an independent low-temperature refrigerant circulation of the fourth group d concentrator 17, thereby realizing the four-stage freezing and concentration of the initial liquid by the fourth group of concentrators

[0048] Furthermore, when the ice ring is thawed after the first group of freeze concentration is completed, the normal temperature refrigerant tank I 8 can drive and adjust the refrigerant in the normal temperature refrigerant tank I 8 to maintain room temperature through the refrigerant circulation pump No. 9 30 outside the tank, the refrigerant circulation pump No. 10 31, the heater No. 1 66, the heater No. 2 67 and the circulation pipe; the normal temperature refrigerant tank I 8 is connected to the two refrigerant inlets at the bottom of the outer interlayer and the two refrigerant outlets at the upper part of the outer interlayer of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 through the refrigerant circulation pump No. 12, the refrigerant valve No. 10, the refrigerant circulation pump No. 34, the refrigerant valve No. 11, the refrigerant valve No. 12 and the pipeline to form a normal temperature refrigerant circulation, which is responsible for thawing the ice layer connected to the ice ring on the inner wall of the first group of 4 concentration tanks, so as to facilitate timely de-icing.

[0049] Furthermore, when the ice ring is thawed after the second group of freeze concentration is completed, the normal temperature refrigerant tank I 8 can drive and adjust the refrigerant in the normal temperature refrigerant tank I 8 to maintain room temperature through the refrigerant circulation pump No. 9 30 outside the tank, the refrigerant circulation pump No. 10 31, the heater No. 1 66, the heater No. 2 67 and the circulation pipe; the normal temperature refrigerant tank I 8 forms a normal temperature refrigerant circulation with the two refrigerant inlets of the outer interlayer and the two refrigerant outlets on the upper part of the outer interlayer of the second group b1 concentration tank 14 and b2 concentration tank 15 through the refrigerant circulation pump No. 14 34, the refrigerant valve No. 13 52, the refrigerant valve No. 14 53 and the pipeline, which is responsible for thawing the ice layer connected with the ice ring on the inner wall of the second group of two concentration tanks and de-icing in time.

[0050] Furthermore, when the ice ring is thawed after the third group of freeze concentration is completed, the normal temperature refrigerant II tank 9 can drive and adjust the refrigerant in the normal temperature refrigerant II tank 9 to maintain room temperature through the refrigerant circulation pump No. 12 32, the heater No. 3 68 and the circulation pipe outside the tank; the normal temperature refrigerant II tank 9 forms a normal temperature refrigerant circulation through the refrigerant circulation pump No. 15 35, the refrigerant valve No. 15 54, the refrigerant valve No. 16 55 and the pipeline with the two refrigerant inlets of the outer interlayer of the third group c concentration tank and the two refrigerant outlets on the upper part of the outer interlayer, which is responsible for thawing the ice layer connected to the inner wall of the third group c concentration tank 16 and the ice ring, so as to facilitate timely de-icing.

[0051] Furthermore, when the ice ring is thawed after the fourth group of freeze concentration is completed, the normal temperature refrigerant II tank 9 can drive and adjust the refrigerant in the normal temperature refrigerant II tank 9 to maintain normal temperature through the refrigerant circulation pump No. 12 32, the heater No. 3 68 and the circulation pipe outside the tank; the normal temperature refrigerant II tank 9 forms a normal temperature refrigerant circulation through the refrigerant circulation pump No. 15 35, the refrigerant valve No. 17 56, the refrigerant valve No. 18 57 and the pipeline with the two refrigerant inlets of the outer interlayer of the fourth group d concentration tank 17 and the two refrigerant outlets on the upper part of the outer interlayer, which is responsible for thawing the ice layer connected between the inner wall of the third group d concentration tank and the ice ring, so as to facilitate timely de-icing.

[0052] Furthermore, if Figure 2 As shown, the four groups of eight concentration tanks are equipped with LED lighting lamps 78 and real-time camera devices 76 on the top of the tank covers, which can observe, photograph or record the freezing concentration process and ice ring growth process in the corresponding tanks in real time.

[0053] Furthermore, if Figure 1 and Figure 2As shown, the four groups of eight concentrating tanks are large-capacity tanks. To ensure that the heat transfer of the feed liquid is more uniform during the freeze concentration process, the a1 concentrating tank 10 is equipped with stirring devices 10-1, 10-2 and 10-3, the a2 concentrating tank 11 is equipped with stirring devices 11-1, 11-2 and 11-3, the a3 concentrating tank 12 is equipped with stirring devices 12-1, 12-2 and 12-3, the a4 concentrating tank 13 is equipped with stirring devices 13-1, 13-2 and 13-3, the b1 concentrating tank 14 is equipped with stirring devices 14-1, 14-2 and 14-3, the b2 concentrating tank 15 is equipped with stirring devices 15-1, 15-2 and 15-3, the c concentrating tank 16 is equipped with stirring devices 16-1, 16-2 and 16-3, and the d concentrating tank 17 is equipped with stirring devices 17-1, 17-2 and 17-3. In particular, the directions of the stirring motors of the three stirring devices on each concentration tank are opposite to each other, which is more conducive to the uniform flow of the liquid in the tank, accelerates the heat transfer and cooling of the liquid, and eliminates the concentration polarization on the surface of the ice layer.

[0054] Further, when the freeze concentration of the first group of concentration tanks is completed, the No. 1 liquid valve 58, No. 2 liquid valve 59, No. 3 liquid valve 60 and No. 4 liquid valve 61 at the bottom of the a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 are opened, and the concentrated liquid of the first group of concentration tanks is transported to the second group of b1 concentration tanks 14 and b2 concentration tanks 15 for the next stage of freeze concentration by the No. 1 liquid pump 36; when the freeze concentration of the second group of concentration tanks is completed, the No. 5 liquid valve 62 and No. 6 liquid valve at the bottom of the second group of b1 concentration tanks 14 and b2 concentration tanks 15 are opened. Valve 63, use No. 2 liquid pump 37 to transport the concentrated liquid of the second group of concentration tanks to the third group c concentration tank 16 for the next stage of freeze concentration; when the third group of concentration tanks completes freeze concentration, open No. 7 liquid valve 64 at the bottom of the third group c concentration tank 16, and use No. 3 liquid pump 38 to transport the concentrated liquid of the third group of concentration tanks to the fourth group d concentration tank 17 for the next stage of freeze concentration; when the fourth group of concentration tanks completes freeze concentration, open No. 8 liquid valve 65 at the bottom of the fourth group d concentration tank 17, and use No. 4 liquid pump 39 to transport the concentrated liquid of the fourth group of concentration tanks to the temporary storage tank 18 for collection.

[0055] In particular, the intelligent operation control system 1 is equipped with a PLC operation panel, data processing and automatic control module software, a record storage device and various supporting electrical control components; the various supporting electrical control components are respectively connected to the aforementioned three refrigeration systems, three low-temperature coolant tanks, two normal temperature coolant tanks, four groups of eight concentration tanks, and their respective supporting three heat exchangers, 14 coolant circulation pumps, 18 coolant valves, four liquid pumps, 8 liquid valves and all temperature probes, stirring devices, LED lighting and real-time camera devices on the concentration tanks, so as to realize the setting and modification of the freezing concentration operation parameters, automatic operation of the whole machine, remote monitoring, and real-time display, storage and export of operation parameters, data and image data.

[0056] Example 2: One-stage to multi-stage continuous freeze concentration in a large-capacity production facility for progressive freeze concentration

[0057] The following will be combined with the attached examples of the present application Figures 1 to 3 , the one-stage to multi-stage continuous freeze-concentration operation steps in the embodiments of the present application are clearly and completely described.

[0058] Operation step 1: First, complete the primary freeze concentration and deicing operation of the initial liquid at the bottom of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13:

[0059] Turn on the power of the equipment and open the intelligent operation control system 1; transport the initial liquid to the first group of a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 and reach the corresponding volume. At this time, all the refrigerant circulation pumps and all valves in the equipment are in the closed state.

[0060] First, refer to the freezing point and supercooling point of the initial feed liquid, and set the first temperature range of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 on the operation panel, and the time is 1 to 3 hours; the second, third, fourth and fifth temperature ranges are 2 to 4°C lower than the previous one, and the time is 1 to 3 hours; start the A refrigeration system 2 (including synchronously starting the A heat exchanger 19 and the refrigerant circulation pump No. 1 22), start the low-temperature refrigerant circulation of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 (including synchronously opening the refrigerant valve No. 1 40, the refrigerant valve No. 2 41, the refrigerant valve No. 3 42, the refrigerant valve No. 3 43, the refrigerant valve No. 3 44, the refrigerant valve No. 3 45, the refrigerant valve No. 3 46, the refrigerant valve No. 3 47, the refrigerant valve No. 3 48, the refrigerant valve No. 3 49, the refrigerant valve No. 3 49, the refrigerant valve No. 3 48 ...9, the refrigerant valve No. 3 49, the refrigerant valve No. 3 49, the refrigerant valve No. 3 49, the refri The refrigerant valve No. 41 and the refrigerant valve No. 3 42 are started, and the refrigerant circulation pump No. 4 25 and the refrigerant circulation pump No. 5 26 are started to start freeze concentration; at the same time, the stirring time of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 is set and the stirring devices 10-1, 10-2 and 10-3, 11-1, 11-2 and 11-3, 12-1, 12-2 and 12-3, 13-1, 13-2 and 13-3 are started, and the equipment automatically runs one to five stages of freeze concentration of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13.

[0061] The LED lighting 78 and the real-time camera device 76 on the top of each tank of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 are turned on halfway to observe the thickening of the ice layer in the tank. When the ice layer in the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 approaches the stirring blade, the stirring of all stirring devices of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 is stopped, and then the lid of each tank can be opened to remove the stirring paddle, and the valve at the bottom of the first group of 4 tanks is opened to release a small amount of concentrated liquid to determine its concentration.

[0062] When the primary concentrated liquid does not reach the expected concentration and needs secondary freeze concentration, the low-temperature refrigerant circulation of the first group of four concentration tanks is closed to end the primary freeze concentration, and the No. 1 feed pump 36 is started to transport all the primary frozen concentrated liquid to the second group of b1 concentration tanks 14 and b2 concentration tanks 15, and the feed liquid capacity in the b1 concentration tank 14 and b2 concentration tank 15 is made the same as much as possible, and the secondary freeze concentration is started; when the expected concentration has been reached, the secondary freeze concentration is no longer performed. At the same time, the thawing temperature (usually 10-15°C) and thawing time (usually 0.5-1h) of each tank of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 can be set in advance on the operation panel, and the normal temperature refrigerant circulation of the normal temperature refrigerant tank I 8 is started (including synchronously opening the refrigerant circulation No. 9 pump 30, the refrigerant circulation No. 10 pump 31, the No. 1 heater 66 and the No. 2 heater 67).

[0063] Start the outer interlayer normal temperature brine circulation of the first group a1 concentrator 10, a2 concentrator 11, a3 concentrator 12 and a4 concentrator 13 (including synchronously opening the brine circulation pump No. 12 33, the brine valve No. 10 49, the brine circulation pump No. 13 34, the brine valve No. 11 50 and the brine valve No. 12 51), and complete the thawing of the outer ring of the ice ring in the first group of 4 concentrators. After the outer ring of the ice ring is thawed, close the normal temperature brine circulation of the normal temperature brine I tank 8 and the outer interlayer normal temperature brine circulation of the first group of 4 concentrators, open the tank covers of the first group a1 concentrator 10, a2 concentrator 11, a3 concentrator 12 and a4 concentrator 13, take out the ice ring, break it, and use the matching centrifuge to recover the entrained liquid in the ice cubes. The recovered entrained liquid can be added to the second group b1 concentrator 14 and b2 concentrator 15 for mixing, and the remaining first-level white ice can be discarded.

[0064] Furthermore, when the primary freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the primary freeze concentration process data of each tank of the first group a1 concentration tank 10, a2 concentration tank 11, a3 concentration tank 12 and a4 concentration tank 13 can be exported using a U disk, the power supply is turned off, and the equipment is cleaned. At this point, the primary freeze concentration and deicing operation of the initial feed liquid by the first group of 4 concentration tanks are all completed.

[0065] Operation step 2: When the first-stage frozen concentrate does not reach the target concentration and needs to be subjected to second-stage frozen concentration, the second group of b1 concentration tank 14 and b2 concentration tank 15 immediately start the second-stage frozen concentration after receiving the first-stage frozen concentrate.

[0066] Referring to the center temperature of the tank before the first stage of freeze concentration is completed, the first temperature range of the second group of b1 concentration tanks 14 and b2 concentration tanks 15 is set on the operation panel, and the time is 1 to 3 hours; the second, third, fourth and fifth temperature ranges are all 3 to 4°C lower than the previous one, and the time is 1 to 3 hours; start the B refrigeration system 3 (including the synchronous start of the B heat exchanger 20 and the coolant circulation pump No. 2 23), start the low-temperature coolant circulation of the second group of b1 concentration tanks 14 and b2 concentration tanks 15 (including the synchronous start of the heat exchanger 20 and the coolant circulation pump No. 2 23); Open refrigerant valve No. 1 40, refrigerant valve No. 2 41, refrigerant valve No. 3 42, start refrigerant circulation pump No. 4 25 and refrigerant circulation pump No. 5 26) to start secondary freeze concentration; at the same time, set the stirring time of the second group b1 concentration tank 14 and b2 concentration tank 15 and start 6 stirring devices 14-1, 14-2, 14-3, 15-1, 15-2, 15-3, etc., and the equipment automatically runs the first to fifth stages of freeze concentration of the second group b1 concentration tank 14 and b2 concentration tank 15.

[0067] The LED lighting 78 and the real-time camera device 76 in the top of each tank of the second group b1 concentration tank 14 and b2 concentration tank 15 are turned on halfway to observe the thickening of the ice layer in the tank. When the ice layer in the second group b1 concentration tank 14 and b2 concentration tank 15 approaches the stirring blade, the stirring of all stirring devices of the second group b1 concentration tank 14 and b2 concentration tank 15 is stopped. Then, the lid of each tank can be opened to remove the stirring blade, and the valves at the bottom of the second group of 2 tanks are opened to release a small amount of concentrated liquid to determine its concentration.

[0068] When the secondary concentrated liquid does not reach the expected concentration and needs to be subjected to the third-level freeze concentration, the low-temperature refrigerant circulation of the second group b1 concentration tank 14 and b2 concentration tank 15 is closed to end the secondary freeze concentration, and the No. 2 material pump 37 is immediately started to transport all the secondary frozen concentrated liquid to the third group c concentration tank 16 to start the third-level freeze concentration; when the expected concentration has been reached, the third-level freeze concentration is no longer performed. At the same time, the thawing temperature (usually 10-15°C) and thawing time (usually 0.5-1h) of the second group b1 concentration tank 14 and b2 concentration tank 15 can be set in advance on the operation panel, and the normal temperature refrigerant circulation of the normal temperature refrigerant tank I 8 is started (including synchronously and automatically opening the refrigerant circulation No. 9 pump 30, the refrigerant circulation No. 10 pump 31, the No. 1 heater 66 and the No. 2 heater 67).

[0069] Start the outer interlayer normal temperature refrigerant circulation of the second group b1 concentrator tank 14 and b2 concentrator tank 15 (including synchronously and automatically opening the No. 13 refrigerant valve 52, No. 14 refrigerant valve 53 and the refrigerant circulation No. 14 pump 34), and complete the thawing of the outer ring of the ice ring in the second group b1 concentrator tank 14 and b2 concentrator tank 15. After the outer ring of the ice ring is thawed, close the normal temperature refrigerant circulation of the normal temperature refrigerant tank I 8 and the outer interlayer normal temperature refrigerant circulation of the second group b1 concentrator tank 14 and b2 concentrator tank 15, open the tank cover of the second group b1 concentrator tank 14 and b2 concentrator tank 15, take out the ice ring, break it, and use the matching centrifuge to recover the entrained liquid in the ice cubes. The recovered entrained liquid can be added to the third group c concentrator tank 16 for mixing, and the remaining secondary white ice can be discarded.

[0070] Furthermore, when the secondary freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the secondary freeze concentration process data can be exported using a USB flash drive, the power supply is turned off, and the equipment is cleaned. At this point, the secondary freeze concentration and deicing operations of the initial feed liquid by the second group of b1 concentration tanks 14 and b2 concentration tanks 15 are all completed.

[0071] Operation step three: when the secondary frozen concentrate does not reach the target concentration and needs to be subjected to tertiary frozen concentration, the third group c concentration tank 16 immediately starts tertiary frozen concentration after receiving the secondary frozen concentrate.

[0072] Referring to the center temperature in the tank before the end of the second-stage freeze concentration, set the first temperature range of the third group C concentration tank 16 on the operation panel, the time is 1 to 3 hours; the second, third, fourth and fifth temperature ranges are 3 to 4°C lower than the previous one, and the time is 1 to 3 hours; start the C refrigeration system 4 (including synchronous start of the C heat exchanger 21 and the refrigerant circulation pump No. 3 24), start the low-temperature refrigerant circulation of the third group C concentration tank 16 (including synchronous automatic opening of the refrigerant circulation pump No. 7 28, the refrigerant valve No. 6 45, and the refrigerant valve No. 7 46) to start the third-stage freeze concentration; at the same time, set the stirring time of the third group C concentration tank 16 and start the stirring devices 16-1, 16-2, and 16-3, and the equipment automatically runs the first to fifth stages of freeze concentration of the third group C concentration tank 16.

[0073] The LED lighting 78 and the real-time camera 76 of the third group c concentration tank 16 are turned on during the process to observe the thickening of the ice layer in the tank. When the ice layer in the third group c concentration tank 16 is close to the stirring paddle blades, the stirring of the three stirring devices is stopped, the tank cover is opened and the stirring paddle is removed, and a small amount of concentrated liquid is released from the valve at the bottom of the third group c concentration tank 16 to determine its concentration.

[0074] When the third-level concentrated liquid does not reach the expected concentration and needs to be subjected to the fourth-level freeze concentration, the low-temperature refrigerant circulation of the third group c concentration tank 16 is closed to end the third-level freeze concentration, and the No. 3 material pump 38 is immediately started to transport all the third-level frozen concentrated liquid of the third group c concentration tank 16 to the fourth group d concentration tank 17; when the expected concentration has been reached, the fourth-level freeze concentration is no longer performed. At the same time, the thawing temperature (usually 10-15°C) and thawing time (usually 0.5-1h) of the third group c concentration tank 16 can be set in advance on the operation panel, and the normal temperature refrigerant circulation of the normal temperature refrigerant II tank 9 is started (including the synchronous automatic opening of the refrigerant circulation No. 11 pump 32 and the start of the No. 3 heater 32).

[0075] Start the outer layer normal temperature refrigerant circulation of the third group C concentrator tank 16 (including synchronously and automatically opening the No. 15 refrigerant valve 54, the No. 16 refrigerant valve 55 and the refrigerant circulation No. 15 pump 35), and complete the thawing of the outer ring of the ice ring in the third group C concentrator tank 16. After the outer ring of the ice ring is thawed, close the normal temperature refrigerant circulation of the normal temperature refrigerant II tank 9 and the outer layer normal temperature refrigerant circulation of the third group C concentrator tank 16, open the tank cover of the third group C concentrator tank 16, take out the ice ring, break it, and use the matching centrifuge to recover the entrained liquid in the ice. The recovered entrained liquid can be added to the fourth group D concentrator tank 17 for mixing, and the remaining three-level white ice can be discarded.

[0076] Furthermore, when the three-stage freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the three-stage freeze concentration process data can be exported using a USB flash drive, the power supply is turned off, and the equipment is cleaned. At this point, the three-stage freeze concentration and deicing operations of the initial feed liquid by the third group C concentration tank 16 are all completed.

[0077] Operation step 4: When the third-stage frozen concentrate does not reach the target concentration and needs to be subjected to fourth-stage frozen concentration, the fourth group d concentration tank 17 immediately starts the fourth-stage frozen concentration after receiving the third-stage frozen concentrate.

[0078] Referring to the center temperature in the tank before the end of the third-stage freeze concentration, set the first temperature range of the fourth group d concentration tank 17 on the operation panel, the time is 1 to 3 hours; the second, third, fourth and fifth temperature ranges are 3 to 4°C lower than the previous one, and the time is 1 to 3 hours; start the C refrigeration system 4 (including synchronously starting the C heat exchanger 21 and the refrigerant circulation pump No. 3 24), start the low-temperature refrigerant circulation of the fourth group d concentration tank 17 (including synchronously and automatically opening the refrigerant circulation pump No. 8 29, the refrigerant valve No. 8 47, and the refrigerant valve No. 9 48)) to start the fourth-stage freeze concentration; at the same time, set the stirring time of the fourth group d concentration tank 17 and start the stirring devices 17-1, 17-2, and 17-3, and the equipment automatically runs the first to fifth stages of freeze concentration of the fourth group d concentration tank 17.

[0079] The LED lighting 78 and the real-time camera 76 of the fourth group d concentration tank 17 are turned on during the process to observe the thickening of the ice layer in the tank. When the ice layer in the fourth group d concentration tank 17 is close to the stirring blades, the stirring of the three stirring devices is stopped, the tank cover is opened and the stirring paddle is removed, and a small amount of concentrated liquid is released from the valve at the bottom of the fourth group d concentration tank 17 to determine its concentration.

[0080] When the fourth-level concentrated liquid does not reach the expected concentration and needs to be subjected to the fifth-level freeze concentration, the low-temperature refrigerant circulation of the fourth group d concentration tank 17 is closed to end the fourth-level freeze concentration, and the No. 4 material pump 39 is immediately started to transport all the fourth-level frozen concentrated liquid of the fourth group d concentration tank 17 to the temporary storage tank 18; when the expected concentration has been reached, the fifth-level freeze concentration is no longer performed. At the same time, the thawing temperature (usually 10-15°C) and thawing time (usually 0.5-1h) of the fourth group d concentration tank 17 can be set in advance on the operation panel, and the normal temperature refrigerant circulation of the normal temperature refrigerant II tank 9 is started (including the synchronous automatic opening of the refrigerant circulation No. 11 pump 32 and the start of the No. 3 heater 32).

[0081] Start the outer layer normal temperature refrigerant circulation of the fourth group d concentration tank 17 (including synchronously and automatically opening the No. 17 refrigerant valve 56, the No. 18 refrigerant valve 57 and the refrigerant circulation No. 15 pump 35), and complete the thawing of the outer ring of the ice ring in the fourth group d concentration tank 17. After the outer ring of the ice ring is thawed, close the normal temperature refrigerant circulation of the normal temperature refrigerant II tank 9 and the outer layer normal temperature refrigerant circulation of the fourth group d concentration tank 17, open the tank cover of the fourth group d concentration tank 17, take out the ice ring, break it, and use the matching centrifuge to recover the entrained liquid in the ice. The recovered entrained liquid can be added to the temporary storage tank for mixing, and the remaining fourth-level white ice can be discarded.

[0082] Furthermore, when the four-stage freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the four-stage freeze concentration process data can be exported using a USB flash drive, the power supply is turned off, and the equipment is cleaned. At this point, the four-stage freeze concentration and deicing operations of the fourth group d concentration tank 17 on the initial liquid are all completed.

[0083] Furthermore, for progressive freeze concentration, in actual situations, most feed solutions with suitable concentrations usually only need to complete second to fourth stage freeze concentration to reach the desired target concentration or a maximum ultimate concentration of 50% (w / w); only some feed solutions with extremely low initial concentrations require more than four stages of freeze concentration.

[0084] Operation step five: If the four-stage frozen concentrate still cannot reach the expected target concentration, then use the series sequence cycle of the first, second, third and fourth groups of concentration tanks to repeat a new round of the above-mentioned one, two, three and four steps, and perform a new round of one, two, three and four-stage continuous freeze concentration on the initial liquid in turn. After collecting a sufficient volume of the four-stage frozen concentrate, use the series sequence cycle of the first, second, third and fourth groups of concentration tanks of this equipment, starting from the four-stage frozen concentrate, and perform five or more freeze concentration operations in turn to finally reach the target concentration.

[0085] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration, characterized in that: The core structure of the equipment includes four groups of 8 concentration tanks, 3 refrigeration systems, 3 low-temperature coolant tanks, 2 normal-temperature coolant tanks and an intelligent operation control system; The concentration tanks include a1, a2, a3, a4, b1, b2, c and d concentration tanks; The refrigeration system includes refrigeration system A, refrigeration system B and refrigeration system C; The cryogenic coolant tanks include a cryogenic coolant A tank, a cryogenic coolant B tank and a cryogenic coolant C tank; The normal temperature coolant tank includes a normal temperature coolant I tank and a normal temperature coolant II tank.

2. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 1, characterized in that: The four groups of eight concentration tanks are all 150-500L large-capacity stainless steel sandwich flat rectangular progressive freezing concentration tanks, namely a1, a2, a3, a4, b1, b2, c and d concentration tanks, with a total capacity ranging from 1200 to 4000L, wherein a1, a2, a3, a4, b1, b2 and c concentration tanks have the same capacity specifications. Once the capacity specifications are determined, the capacity of d concentration tank is 50-100% of that of c concentration tank; wherein a1, a2, a3 and a4 concentration tanks are connected in parallel to form a first group, b1 and b2 concentration tanks are connected in parallel to form a second group, c concentration tank is a third group, and d concentration tank is a fourth group; The four groups of eight concentrators have two stainless steel flat plates on the side of the middle part of the flat rectangular body cavity of the stainless steel sandwich structure, which are combined with a stainless steel semi-cylindrical shell at each end of the tank body. The diameter and height of the stainless steel semi-cylindrical shell at both ends are equal to the spacing and height of the two stainless steel flat plates, and the bottom is a stainless steel concave component with the same shape and size as the cross-section of the tank body, which are welded together. Taking into account the maximum concentration efficiency and operational convenience, the size range of the two stainless steel flat plates in the middle of the tank body of the four groups of eight concentrators is: 80 to 150 cm long, 70 to 120 cm high, and the distance between the two plates is 18 to 30 cm. The outer layer of the four groups of eight concentrators is a stainless steel outer interlayer. According to the heat transfer requirements of concentrators of different volumes, the thickness of the coolant in the outer interlayer ranges from 5 to 10 cm. The outer interlayer bottom of the four groups of eight concentration tanks each contains two coolant inlets, and the upper part of the outer interlayer contains two coolant outlets; the two coolant inlets are respectively installed at the obliquely symmetrical tangent positions of the combination of the semi-cylindrical outer interlayer at both ends of the freezing concentration tank body and the bottom of the rectangular outer interlayer, and the two coolant outlets are respectively installed at the obliquely symmetrical tangent positions of the combination of the semi-cylindrical outer interlayer at both ends of the freezing concentration tank body and the upper end of the rectangular outer interlayer; Each of the four groups of eight concentration tanks is equipped with 1 to 2 temperature recording probes in the outer interlayer; two temperature recording probes are installed inside the tank, one of which is installed in one of the two semi-cylinders close to the middle of the inner wall to record the temperature change process of the solution close to the inner wall of the tank, and the other is installed at the bottom of the tank close to the discharge port to record the temperature change process of the solution in the center of the tank; The shape of the tank cover of the four groups of eight concentration tanks is consistent with the size of the tank edge at the upper end of the freezing concentration tank body, and is fixed and sealed by a sealing ring and a buckle; an LED lighting lamp and a real-time camera device are installed on the top of the tank cover, which can observe, take pictures or record the freezing concentration process and ice ring growth process in real time; The four groups of eight concentration tanks are each equipped with three stirring devices, which are respectively installed in the middle positions of the 1st, 3rd and 5th dividing lines of the six equal parts of the horizontal central axis of the tank cover. The installation method of the stirring motor and the stirring paddle is the same as mentioned above, but the rotation directions of the three stirring motors are in the opposite order. The upper end of the stirring paddle is connected to the stirring motor shaft through a movable clamp, and the lower end of the stirring paddle is connected to the center of the movable disc at the bottom of the tank. The stirring paddle can be removed when necessary.

3. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 1, characterized in that: The three low-temperature coolant tanks are connected to the three refrigeration systems and corresponding heat exchangers through their own matching circulation pumps, valves and pipelines to form independent low-temperature coolant circulation, and can continuously adjust the required temperature of the coolant in the three low-temperature coolant tanks; the three low-temperature coolant tanks are connected to the two coolant inlets and two coolant outlets of the outer interlayer of the four groups of eight concentration tanks through their own matching circulation pumps, valves and pipelines to form independent low-temperature coolant circulation, and realize the freeze concentration of the liquid in the four groups of eight concentration tanks; Furthermore, the low-temperature coolant tank A forms an independent low-temperature coolant circulation with the A refrigeration system and its supporting heat exchanger through its own supporting circulation pump, valves and pipelines, and can continuously adjust the required temperature of the coolant in the low-temperature coolant tank A; the low-temperature coolant tank A is also connected to the two coolant inlets and two coolant outlets of the outer interlayer of each of the first group of four concentrators through its own supporting circulation pump, valves and pipelines to form an independent low-temperature coolant circulation of the first group of four concentrators, so as to realize the first-level freeze concentration of the initial feed liquid by the first group of four concentrators; Furthermore, the low-temperature coolant tank B forms an independent low-temperature coolant circulation with the B refrigeration system and its supporting heat exchanger through its own supporting circulation pump, valves and pipelines, and can continuously adjust the required temperature of the coolant in the low-temperature coolant tank B; the low-temperature coolant tank B is also connected to the two coolant inlets and two coolant outlets of the outer interlayer of each of the second group of two concentrators through its own supporting circulation pump, valves and pipelines to form an independent low-temperature coolant circulation of the second group of two concentrators, so as to realize the secondary freezing concentration of the first frozen concentrate completed by the second group of two concentrators on the first group of four concentrators; Furthermore, the low-temperature refrigerant C tank forms an independent low-temperature refrigerant circulation with the C refrigeration system and its supporting heat exchanger through its own supporting circulation pump, valves and pipelines, and can continuously adjust the required temperature of the refrigerant in the low-temperature refrigerant C tank; the low-temperature refrigerant C tank is also connected to the two refrigerant inlets and two refrigerant outlets of the outer interlayer of the third and fourth groups of corresponding concentration tanks through its own supporting circulation pump, valves and pipelines to form an independent low-temperature refrigerant circulation for the third and fourth groups of corresponding concentration tanks; the third group of concentration tanks can perform tertiary freeze-concentration on the secondary frozen concentrated liquid completed by the two concentration tanks of the second group; the fourth group of concentration tanks can perform quaternary freeze-concentration on the tertiary frozen concentrated liquid completed by the third group of concentration tanks.

4. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 1, characterized in that: The normal temperature refrigerant I tank and the normal temperature refrigerant II tank, through their own matching circulation pumps, pipelines and valves, only form four independent normal temperature refrigerant cycles with the outer interlayers of the first group of four concentrators, the second group of two concentrators, and the third and fourth groups of one concentrator each; the normal temperature refrigerant I tank and the normal temperature refrigerant II tank are both equipped with heaters and circulation pumps, which can adjust the refrigerant in the tank to a normal temperature state above 0°C. When the freeze concentration of the first group of four concentrators, the second group of two concentrators, and the third and fourth groups of one concentrator each is completed, the corresponding independent normal temperature refrigerant cycles can be used to quickly thaw the ice layer on the joint surface between the inner wall of each group of corresponding concentrators and the ice ring, so as to facilitate the detachment and de-icing of the ice ring.

5. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 1, characterized in that: The four groups of eight concentration tanks are all large-capacity flat rectangular structures with different capacity specifications ranging from 150L to 500L. The half-width size of the rectangular section in the tank cavity of the concentration tank and the radius of the semi-cylindrical semi-circular section at both ends are both in the range of 9 to 15cm. This tank cavity structure can limit the thickest ice layer formed on each single cold wall surface in the tank to ≤9 to 15cm. Under the condition of the same concentration ratio, the thickness of the ice layer on the flat rectangular progressive freezing concentration tank will be significantly smaller than the ice layer thickness of 12.5 to 32.5cm of the circular progressive freezing concentration tank of the same volume. The thinner ice layer will significantly improve the heat transfer efficiency between the inner wall of the concentration tank and the liquid in the center of the tank, thereby greatly shortening the freezing concentration time, improving the concentration efficiency and reducing the energy consumption of equipment operation.

6. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 1, characterized in that: The intelligent operation control system consists of an operation panel, a data processing and automatic control module, a recording storage, and electrical control elements; the electrical control elements are respectively connected to three refrigeration systems, three low-temperature coolant tanks, two normal temperature coolant tanks, four groups of eight concentration tanks and their corresponding matching heat exchangers, circulation pumps, liquid pumps, valves, temperature probes, stirring devices, LED lighting, and real-time camera devices, so as to realize the setting and adjustment of freeze concentration operation parameters, automatic operation of the whole machine, remote monitoring, and real-time display, storage, and export of operation parameters, data, and image information.

7. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 1, characterized in that: The four groups of eight concentration tanks are used in combination with three low-temperature coolant tanks, two normal-temperature coolant tanks, three refrigeration systems and an operation control system. The four groups of concentration tanks can independently run a freeze concentration program and a thawing program, and realize one-stage to multiple-stage continuous freeze concentration of the feed liquid by sequentially switching the operation modes of the four groups of concentration tanks in series until the target concentration or the ultimate mass concentration of up to 50% is reached. In particular, when the initial feed liquid reaches the target concentration after completing the first-stage freeze concentration, the first, second, third and fourth groups of 8 concentration tanks can simultaneously perform the first-stage freeze concentration, and at this time, the maximum one-time processing capacity of the feed liquid of the equipment can reach 4.0t; In particular, when the initial feed liquid needs to complete the second-stage freeze concentration to reach the target concentration, the first and second groups of 6 concentration tanks can simultaneously perform the first-stage freeze concentration, and the maximum one-time processing capacity of the feed liquid of the equipment can reach 3.0t; the third and fourth groups of concentration tanks complete the second-stage freeze concentration of the first-stage concentrated liquid; and during the next stage of freeze concentration, the thawing and deicing operations of the ice ring of the previous stage are completed simultaneously; In particular, when the initial feed liquid needs to complete three-stage freeze concentration to reach the target concentration, the first group of 4 concentration tanks can simultaneously perform the first-stage freeze concentration, and the maximum one-time processing capacity of the equipment for the feed liquid can reach 2.0t; the second group of 2 concentration tanks complete the second-stage freeze concentration of the first-stage concentrate, and the third or fourth group of concentration tanks complete the third-stage freeze concentration of the second-stage concentrate; and during the next stage of freeze concentration, the thawing and deicing operations of the ice ring of the previous stage are completed simultaneously; In particular, when the initial feed liquid needs to complete four-stage freeze concentration to reach the target concentration, the first group of 4 concentration tanks can simultaneously perform the first-stage freeze concentration, and the maximum one-time processing capacity of the equipment for the feed liquid can reach 2.0t; the second group of 2 concentration tanks complete the second-stage freeze concentration of the first-stage concentrate, and the third group of concentration tanks complete the third-stage freeze concentration of the second-stage concentrate, and finally the fourth group of concentration tanks complete the fourth-stage freeze concentration of the third-stage concentrate; and during the next stage of freeze concentration, the thawing and deicing operations of the ice ring of the previous stage are completed simultaneously; In particular, when the initial feed liquid needs to complete four or more stages of freeze concentration to reach the target concentration, the four groups of large-capacity concentration can be based on the series connection sequence of each group, starting from the four-stage freeze concentrated liquid of the previous cycle, and through a new round of series connection sequence of each group, five or more stages of freeze concentration are completed in sequence until the target concentration or the ultimate mass concentration of up to 50% is reached.

8. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 6, characterized in that: During the freeze concentration stage, the operation panel can independently set the freeze concentration temperature range and the corresponding operating time for each of the four groups of eight concentration tanks; further, the descending temperature range and the corresponding operating time for the freeze concentration of the four groups of eight concentration tanks can be independently set in a gradient segmented cooling sequence of one, two, three, four and five stages; further, the intelligent operation control system can automatically execute the freeze concentration process parameters of the first, second, third, fourth to fifth stages set for each of the four groups of eight concentration tanks.

9. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 6, characterized in that: In the thawing stage after the freeze concentration is completed, the operation panel can independently set the thawing temperature and thawing time of the ice rings of each of the four groups of eight concentration tanks. Furthermore, when any group of the four groups of eight concentration tanks needs to be thawed after the freeze concentration is completed, the thawing procedure can be executed separately, and the intelligent operation control system can automatically operate the heater and circulation pump of the corresponding normal temperature coolant tank, and synchronously start the normal temperature coolant circulation between the outer interlayer of the corresponding group of concentration tanks and the corresponding normal temperature coolant tank to implement the thawing of the ice rings.

10. The large-capacity, high-performance progressive freeze concentration production equipment capable of continuous multi-stage concentration according to claim 1, characterized in that: Compared with the traditional single-tank intermittent freeze concentration equipment, the concentration efficiency and production efficiency of the equipment can be significantly improved in the following way: when the equipment uses four groups of concentration tanks in series to perform one-stage to multi-stage freeze concentration on the relevant liquid, the concentrated liquid completed in the previous stage can be immediately transported to the next group of concentration tanks, seamlessly connected and perform the next stage of freeze concentration, the concentration process is continuous, and the concentration efficiency is improved; further, after the freeze concentration of any group of concentration tanks in the four groups of 8 concentration tanks of the equipment is completed, the independent normal temperature refrigerant circulation can be synchronously switched to perform rapid ice ring thawing and complete the deicing operation, which significantly improves the production efficiency; The equipment performs one-stage to multiple-stage continuous freeze concentration of the relevant liquid, saves operation time and energy consumption, and improves the concentration production efficiency, which is achieved through the following steps: Operation step 1: First, complete the first-stage freeze concentration and deicing operation of the initial liquid in the first group of 4 concentration tanks; ① Turn on the power of the equipment and open the intelligent operation control system; transport the initial liquid to the first group of 4 concentration tanks to reach the corresponding volume; ② Set the first to fifth freeze concentration temperature ranges and the operating time parameters of each section for the first group of four concentration tanks on the operation panel, start freeze concentration for the first group of four concentration tanks, and set the stirring time of the corresponding concentration tanks and start stirring; ③ Open the video to observe the thickening of the ice layer. When the first group of 4 concentration tanks automatically complete the first to fifth stages of continuous freeze concentration procedures, or when the ice layer in the first group of 4 concentration tanks is close to the stirring blades, stop stirring, open the tank cover and remove the stirring blade, and take a small amount of concentrated liquid from each of the first group of 4 concentration tanks to determine its concentration; ④ If the concentrate still does not reach the expected concentration, all the first-stage frozen concentrate will be transported to the second group of 2 concentration tanks, and the first-stage frozen concentration will be terminated at the same time; if the expected concentration has been reached, the frozen concentration will be terminated and the second-stage frozen concentration will not be performed; ⑤ At the same time, set the thawing temperature and thawing time of the first group of 4 concentrators, start the heater and circulation pump of the normal temperature coolant tank I and the circulation of the normal temperature coolant in the outer interlayer of the 4 concentrators, and after the thawing of the ice rings of the 4 concentrators, the outer rings of the ice rings will be separated from the inner walls of the corresponding tanks, take out all the ice rings in the first group of 4 concentrators, break them, and use the matching centrifuge to recover the entrained liquid in the ice. The recovered entrained liquid can be added to the second group of 2 concentrators for mixing, and the remaining first-level white ice can be discarded; ⑥ Further, when the first-stage freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the first-stage freeze concentration process data can be exported using a USB flash drive, the power supply is turned off, and the equipment is cleaned. At this point, the first group of 4 concentration tanks have completed the first-stage freeze concentration of the initial liquid and the deicing operation in the tanks; Operation step 2: completing the secondary freeze concentration and deicing operation of the primary frozen concentrate by the second set of two concentration tanks; ① Referring to the center temperature of the tank before the end of the previous freeze concentration, set the freeze concentration temperature range of the second group of two concentration tanks from the first to the fifth stage and the operating time parameters of each stage on the operation panel, start the freeze concentration of the second group of two concentration tanks, set the stirring time and start stirring at the same time; ② Open the video to observe the thickening of the ice layer. When the second group of two concentration tanks automatically complete the first to fifth stages of continuous freezing and concentration procedures, or when the ice layer in the second group of two concentration tanks is close to the stirring blades, stop stirring, open the tank cover and remove the stirring blades, and take a small amount of concentrated liquid from each of the second group of two concentration tanks to determine its concentration; ③ If the concentrate still does not reach the expected concentration, the secondary freeze concentration is terminated, and all the secondary freeze concentrate is transported to the third group C concentration tank, and operation step 3 is performed to complete the tertiary freeze concentration of the third group C concentration tank; if the expected concentration has been reached, the freeze concentration is terminated, and the tertiary freeze concentration is no longer performed; ④ At the same time, set the thawing temperature and thawing time of the second group of two concentrators, start the heater and circulation pump of the normal temperature coolant tank I and the circulation of the normal temperature coolant in the outer interlayer of the second group of two concentrators, and after the ice rings of the second group of two concentrators are thawed, the outer rings of the ice rings will be separated from the inner walls of the corresponding tanks, and all the ice rings in the second group of two concentrators will be taken out and broken, and the entrained liquid in the ice will be recovered by the matching centrifuge. The recovered entrained liquid can be added to the third group C concentrator for mixing, and the remaining secondary white ice can be discarded; ⑤ Further, when the secondary freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the secondary freeze concentration process data can be exported using a USB flash drive, the power supply is turned off, and the equipment is cleaned. At this point, the secondary freeze concentration of the primary frozen concentrate by the second group of two concentration tanks and the deicing operation in the tanks are all completed; Operation step three: completing the third-stage freeze concentration and deicing operation of the second-stage frozen concentrate by the third group C concentration tank; ① Referring to the center temperature of the tank before the end of the previous freeze concentration, set the freeze concentration temperature range of the third group C concentration tank from the first to the fifth stage and the operating time parameters of each stage on the operation panel, start the freeze concentration of the third group C concentration tank, and set the stirring time and start stirring at the same time; ② Open the video to observe the thickening of the ice layer. When the third group C concentration tank automatically completes the first to fifth stages of continuous freezing and concentration procedures, or the ice layer in the third group C concentration tank approaches the stirring blade, stop stirring, open the tank cover and remove the stirring blade, and take a small amount of concentrated liquid from the third group C concentration tank to determine its concentration; ③ If the concentrate still does not reach the expected concentration, the third-stage freeze concentration is terminated, and all the third-stage freeze concentration is transported to the fourth group d concentration tank, and operation step 4 is performed to complete the fourth-stage freeze concentration of the fourth group d concentration tank; if the expected concentration has been reached, the freeze concentration is terminated, and the fourth-stage freeze concentration is no longer performed; ④ At the same time, set the thawing temperature and thawing time of the third group C concentration tank, start the normal temperature coolant II tank heater and circulation pump and the third group C concentration tank outer interlayer normal temperature coolant circulation, after the third group C concentration tank ice ring thawing is completed, the outer ring of the ice ring will be separated from the inner wall of the corresponding tank, all the ice rings in the third group C concentration tank are taken out and broken, and the entrained liquid in the ice is recovered by the matching centrifuge. The recovered entrained liquid can be added to the fourth group D concentration tank for mixing, and the remaining three-level white ice can be discarded; ⑤ Further, when the tertiary freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the tertiary freeze concentration process data can be exported using a USB flash drive, the power supply is turned off, and the equipment is cleaned. At this point, the tertiary freeze concentration of the secondary frozen concentrate by the third group C concentration tank and the deicing operation in the tank are all completed; Operation step 4: completing the fourth-stage freeze concentration and deicing operation of the third-stage frozen concentrate in the fourth group d concentration tank; ① Referring to the center temperature of the tank before the end of the previous freeze concentration, set the freeze concentration temperature range of the fourth group d concentration tank from the first to the fifth stage and the operating time parameters of each stage on the operation panel, start the freeze concentration of the fourth group d concentration tank, set the stirring time and start stirring at the same time; ② Open the video to observe the thickening of the ice layer. When the fourth group d concentration tank automatically completes the first to fifth stages of continuous freezing and concentration procedures, or the ice layer in the fourth group d concentration tank approaches the stirring blade, stop stirring, open the tank cover and remove the stirring blade, and take a small amount of concentrated liquid from the fourth group d concentration tank to determine its concentration; ③ If the concentrate still does not reach the expected concentration, the fourth-stage freeze concentration is terminated, and all the fourth-stage freeze concentration is collected in a temporary storage tank for fifth-stage freeze concentration; if the expected concentration has been reached, the freeze concentration is terminated and the fifth-stage freeze concentration is no longer performed; ④At the same time, set the thawing temperature and thawing time of the fourth group d concentration tank, start the heater and circulation pump of the normal temperature refrigerant II tank and the circulation of the normal temperature refrigerant in the outer interlayer of the fourth group d concentration tank, and after the ice ring of the fourth group d concentration tank is thawed, the outer ring of the ice ring will be separated from the inner wall of the corresponding tank, and all the ice rings in the fourth group d concentration tank are taken out and broken, and the entrained liquid in the ice is recovered by the matching centrifuge. The recovered entrained liquid can be added to the temporary storage tank for mixing, and the remaining fourth-level white ice can be discarded; ⑤ Further, when the four-stage freeze concentration reaches the expected target concentration and before the whole machine operation is terminated, the four-stage freeze concentration process data can be exported using a USB flash drive, the power supply is turned off, and the equipment is cleaned. At this point, the four-stage freeze concentration of the three-stage frozen concentrate by the fourth group d concentration tank and the deicing operation in the tank are all completed; Operation step 5: If the four-stage frozen concentrate still cannot reach the expected target concentration, a new round of the above-mentioned one, two, three, and four steps can be repeated by using the series sequence cycle of the first, second, third, and fourth groups of concentration tanks, and a new round of one, two, three, and four-stage continuous freeze concentration can be performed on the initial liquid in sequence. After collecting a sufficient volume of the four-stage frozen concentrate, the first, second, third, and fourth groups of concentration tanks of the equipment are used in a series sequence cycle, starting from the four-stage frozen concentrate, and five or more freeze concentration operations are performed in sequence to finally reach the target concentration; In particular, for progressive freeze concentration, in actual situations, most feed solutions with suitable concentrations usually only need to complete second to fourth stage freeze concentration to reach the desired target concentration or a maximum ultimate mass concentration of 50%; only some feed solutions with extremely low initial concentrations require more than four stages of freeze concentration.

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