Ice slurry preparation system and method for alternately preparing ice slurry

Abstract

The invention discloses an ice slurry preparation system and a method for alternately preparing ice slurry, and relates to the technical field of ice making. The ice slurry preparation system comprises an ice making module, a compressor, a condenser and a variable evaporation cooling module which are sequentially communicated through a main loop; the ice making module comprises a first evaporator, a second evaporator, a first regulating valve, a second regulating valve, a water distributor and an ice storage structure, the first evaporator and the second evaporator are arranged in the main loop in parallel, and the first regulating valve and the second regulating valve are arranged at the output ends of the first evaporator and the second evaporator respectively; in the technical scheme provided by the invention, the first evaporator and the second evaporator alternately operate, so that the ice slurry making efficiency is improved. Besides, the ice layers on the outer surfaces of the first evaporator and the second evaporator fall off automatically, so that an ice scraper does not need to be additionally arranged for scraping ice, the overall energy consumption of ice slurry making is saved, and the ice slurry making system is more in line with the concept of environmental protection.

Description

Technical Field

[0001] The invention relates to the technical field of ice making, and in particular to an ice slurry preparation system and a method for alternately preparing ice slurry. Background Art

[0002] Energy storage technology is one of the key technologies to solve the volatility and randomness of renewable electricity production, and is crucial to the realization of my country's "dual carbon" strategy. Compared with various energy storage methods such as electrochemical energy storage and compressed air energy storage, cold storage has the characteristics of low cost, high energy storage density, and long service life. It has important application value for the peak-to-valley difference of power load caused by industrial and commercial refrigeration and the large-scale consumption of electricity generated by renewable energy.

[0003] Ice slurry is a common way to store cold. Ice slurry refers to a solid-liquid two-phase solution containing a large number of suspended ice crystal particles, in which the average size of the ice crystal particles does not exceed 1mm. The phase change latent heat and low-temperature sensible heat of ice slurry are huge, which is 5 to 6 times the cooling capacity of conventional chilled water under the same conditions. Since the diameter of the ice crystal particles in the ice slurry is very small, generally at the micron level, the two-phase solution composed of ice crystal particles and water has good thermal properties and transmission properties, and can be transported by pipeline or stored in ice tanks like ordinary fluids. Compared with the static cold storage method, it can give full play to the advantages of phase change fluid to enhance heat transfer. In addition, compared with other forms of ice, ice slurry can also flow into the gap, providing a higher cooling rate and a larger heat exchange area. When exchanging heat in the form of ice slurry, the specific area of ​​the ice melting process is greatly improved, which can greatly increase the cooling rate.

[0004] The most common methods for making dynamic ice slurry are supercooling and scraping. Because the supercooled water dynamic ice making technology is not mature enough, ice crystals are difficult to control during the growth process, and ice cubes are easily generated. The operation of the system and the transportation of ice crystals are extremely unstable. In addition, the supercooling of water also affects the improvement of the ice making rate. These factors limit the promotion and application of the supercooled water dynamic ice making system in actual engineering. The scraping method uses a solution pump to transport the aqueous solution to the inside of the heat exchanger. The aqueous solution enters from the top and exits from the bottom. The aqueous solution is cooled to the crystallization temperature by using the heat exchange of the partition wall. The aqueous solution from top to bottom condenses on the wall of the evaporator to form ice crystals. The scraper located in the heat exchanger is then used to rotate and scrape the ice crystals condensed on the inner wall layer by layer, and mixed with uncondensed liquid water to obtain ice slurry. However, the scraping method for making ice slurry cannot avoid the problem of too thick ice layer on the evaporator wall caused by too fast crystallization speed, which increases the resistance of the scraper to rotate and scrape, and increases the power consumption of the motor. Summary of the invention

[0005] The main purpose of the present invention is to provide an ice slurry preparation system and a method for alternately preparing ice slurry, aiming to provide an ice slurry preparation system with lower energy consumption and more environmental protection.

[0006] To achieve the above-mentioned purpose, the ice slurry preparation system proposed in the present invention comprises an ice making module, a compressor, a condenser and an evaporative cooling module which are sequentially connected through a main circuit;

[0007] The ice-making module comprises a first evaporator, a second evaporator, a first regulating valve, a second regulating valve, a water distributor and an ice storage structure, the first evaporator and the second evaporator are arranged in parallel in the main circuit, and the first regulating valve and the second regulating valve are respectively arranged at the output ends of the first evaporator and the second evaporator;

[0008] The variable evaporative cooling module includes a first cooler, a second cooler, a first input valve, a second input valve, a first output valve, a second output valve and a throttle valve. The first cooler and the second cooler are arranged in parallel in the main circuit. The first input valve and the first output valve are respectively arranged at the input end and the output end of the first cooler. The second input valve and the second output valve are respectively arranged at the input end and the output end of the second cooler. The throttle valve is arranged in the main circuit and is located between the variable evaporative cooling module and the ice-making module.

[0009] In one embodiment, the ice slurry preparation system further includes a water supply module, the water supply module includes a water storage tank and a water pump, the water storage tank is connected to the water distributor, and the water pump is used to pump water in the water storage tank to the water distributor;

[0010] The water distributor has two spray ends, and each of the spray ends is respectively arranged toward one of the evaporators.

[0011] In one embodiment, the ice-making module further includes a first temperature sensor and a second temperature sensor, wherein the first temperature sensor and the second temperature sensor are electrically connected to the first evaporator and the second evaporator, respectively, and are used to monitor the temperature of each evaporator.

[0012] In one embodiment, the water replenishment module further includes a water recovery tank, which is disposed on a side of the ice storage structure facing away from the water distributor, the ice storage structure is provided with a filter hole, and the water recovery tank is connected to the water storage tank.

[0013] In one embodiment, the ice slurry preparation system also includes a circulation loop, one end of the circulation loop is connected to the first cooler and the second cooler respectively, and the other end is connected to the input end of the compressor, and the circulation loop is provided with a third regulating valve corresponding to the first cooler and a fourth regulating valve corresponding to the second cooler respectively.

[0014] In one embodiment, the variable evaporative cooling module further includes an air-cooled direct expansion air conditioner, which is connected to the first cooler and the second cooler respectively to perform secondary cooling on the refrigerant.

[0015] In one embodiment, the ice slurry preparation system further comprises a flow sensor, and the flow sensor is arranged in the main circuit and located between the compressor and the condenser.

[0016] In one embodiment, the ice slurry preparation system further includes an ice storage structure, and the ice storage structure is connected to the ice storage structure through an ice slurry transportation channel.

[0017] The present invention also provides a method for alternately preparing ice slurry, which is applied to the above-mentioned ice slurry preparation system, comprising:

[0018] Obtaining the refrigerant temperature T when the evaporator wall is frozen, the refrigerant temperature T1 of the first evaporator in actual operation, and the refrigerant temperature T2 of the second evaporator in actual operation;

[0019] Determine whether T1 is equal to T. If T1=T, the wall surface of the first evaporator begins to freeze; if T1<T, continue to wait until T1=T;

[0020] Obtaining a preset thickness limit value H of ice on the evaporator wall, an actual thickness H1 of ice on the first evaporator wall, and an actual thickness H2 of ice on the second evaporator wall;

[0021] It is determined whether H1 is equal to H. If H1=H, the first regulating valve is closed to make the refrigerant in the first evaporator in a static pressure increase state; if 0

[0022] In one embodiment, the step of determining whether H1 is equal to H, if H1=H, closing the first regulating valve to make the refrigerant in the first evaporator in a static pressure increase; if 0

[0023] If H1=H, control the refrigerant to enter the second evaporator;

[0024] Determine whether T2 is equal to T. If T2=T, the wall surface of the second evaporator begins to freeze; if T2<T, continue to wait until T2=T;

[0025] Determine whether H2 is equal to H. If H2=H, close the second regulating valve to make the refrigerant in the second evaporator in a static pressure increase, and at the same time start the refrigerant supply to the first evaporator; if 0<H2<H, continue to make ice.

[0026] ​​The technical solution of the present invention proposes an ice slurry preparation system and a method for alternately preparing ice slurry, wherein the ice slurry preparation system mainly includes a main circuit and an ice-making module, a compressor, a condenser and an evaporative cooling module connected to the main circuit in sequence. Specifically, the ice-making module includes a first evaporator, a second evaporator, a first regulating valve, a second regulating valve, a water distributor and an ice storage structure. The first evaporator and the second evaporator are arranged in parallel in the main circuit, and the first regulating valve and the second regulating valve are respectively arranged at the output ends of the first evaporator and the second evaporator. In the process of making ice slurry, low-temperature refrigerant is provided to the first evaporator and the second evaporator, and the water distributor is opened at the same time to distribute water on the outer surfaces of the two evaporators. The low-temperature refrigerant will cool the first evaporator to below 0°C and absorb the heat of the water attached to the outer wall of the first evaporator, so that ice crystals will condense on the outer wall of the first evaporator. As time goes by, the thickness of the ice layer condensed on the outer wall of the first evaporator gradually increases until it reaches a preset thickness limit of the ice layer. At this time, the first regulating valve at the output end of the first evaporator is controlled to be closed, and the second regulating valve at the output end of the second evaporator is opened, so that the pressure in the first evaporator increases and the temperature rises, so that the ice layer on the outer wall of the first evaporator partially melts and falls into the ice storage structure under the action of gravity; at the same time, the refrigerant flows through the inside of the second evaporator, so that the second evaporator is cooled and the water on its outer wall condenses into an ice layer. As time goes by, the thickness of the ice layer on the outer wall of the second evaporator reaches a preset thickness limit, the second regulating valve is closed, and the first regulating valve is opened at the same time, so that the first evaporator starts to make ice again according to the above working principle. In this reciprocating cycle, the first evaporator and the second evaporator operate alternately, thereby improving the efficiency of ice slurry making. In addition, since the ice layers on the outer surfaces of the first evaporator and the second evaporator fall off automatically, there is no need to set up an additional ice scraper for scraping ice, which saves the overall energy consumption of ice slurry making and is more in line with the concept of green environmental protection. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0028] Figure 1 A structural schematic diagram of an embodiment of an ice slurry preparation system provided by the present invention;

[0029] Figure 2 for Figure 1 The working cycle logic diagram of the ice making module;

[0030] Figure 3 The figure is a schematic flow chart of the method for alternately preparing ice slurry provided by the present invention.

[0031] Description of Figure Numbers:

[0032] 100. Ice slurry preparation system; 11. Main loop; 12. Circulation loop; 2. Ice making module; 21. First evaporator; 211. First regulating valve; 212. Fifth regulating valve; 22. Second evaporator; 221. Second regulating valve; 222. Sixth regulating valve; 23. Water distributor; 24. Ice storage structure; 25. Water recovery tank; 26. Water storage tank; 261. Water pump; 3. Compressor; 4. Condenser; 5. Variable evaporative cooling module; 51. First cooler; 511. First input valve; 512. First output valve; 513. Third regulating valve; 52. Second cooler; 521. Second input valve; 522. Second output valve; 523. Fourth regulating valve; 53. Throttle valve; 54. Air-cooled direct expansion air conditioner; 541. Water pump; 6. Flow sensor; 7. Ice storage structure.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0037] The most common methods for making dynamic ice slurry are supercooling and scraping. Because the supercooled water dynamic ice making technology is not mature enough, ice crystals are difficult to control during the growth process, and ice cubes are easily generated. The operation of the system and the transportation of ice crystals are extremely unstable. In addition, the supercooling of water also affects the improvement of the ice making rate. These factors limit the promotion and application of the supercooled water dynamic ice making system in actual engineering. The scraping method uses a solution pump to transport the aqueous solution to the inside of the heat exchanger. The aqueous solution enters from the top and exits from the bottom. The aqueous solution is cooled to the crystallization temperature by using the heat exchange of the partition wall. The aqueous solution from top to bottom condenses on the wall of the evaporator to form ice crystals. The scraper located in the heat exchanger is then used to rotate and scrape the ice crystals condensed on the inner wall layer by layer, and mixed with uncondensed liquid water to obtain ice slurry. However, the scraping method for making ice slurry cannot avoid the problem of too thick ice layer on the evaporator wall caused by too fast crystallization speed, which increases the resistance of the scraper to rotate and scrape, and increases the power consumption of the motor.

[0038] In order to solve the above problems, the present invention proposes an ice slurry preparation system 100, which aims to provide an ice slurry preparation system 100 with lower energy consumption and better environmental protection. Figures 1 to 3 FIG. 1 is a schematic structural diagram of an embodiment of an ice slurry preparation system 100 of the present invention.

[0039] Please refer to Figures 1 to 3The present invention proposes an ice slurry preparation system 100, comprising an ice making module 2, a compressor 3, a condenser 4 and a variable evaporative cooling module 5 which are sequentially connected through a main circuit 11; the ice making module 2 comprises a first evaporator 21, a second evaporator 22, a first regulating valve 211, a second regulating valve 221, a water distributor 23 and an ice storage structure 24, the first evaporator 21 and the second evaporator 22 are arranged in parallel in the main circuit 11, the first regulating valve 211 and the second regulating valve 221 are respectively arranged at the output ends of the first evaporator 21 and the second evaporator 22; the variable evaporative cooling module 5 comprises a first cooling The first cooler 51 and the second cooler 52 are connected in parallel in the main circuit 11. The first input valve 511 and the first output valve 512 are respectively arranged at the input end and the output end of the first cooler 51. The second input valve 521 and the second output valve 522 are respectively arranged at the input end and the output end of the second cooler 52. The throttle valve 53 is arranged in the main circuit 11 and is located between the evaporative cooling module 5 and the ice making module 2.

[0040] The technical solution of the present invention proposes an ice slurry preparation system 100 and a method for alternately preparing ice slurry, wherein the ice slurry preparation system 100 mainly includes a main circuit 11 and an ice making module 2, a compressor 3, a condenser 4 and a variable evaporative cooling module 5 which are sequentially connected to the main circuit 11. Specifically, the ice making module 2 includes a first evaporator 21, a second evaporator 22, a first regulating valve 211, a second regulating valve 221, a water distributor 23 and an ice storage structure 24. The first evaporator 21 and the second evaporator 22 are arranged in parallel in the main circuit 11. The first regulating valve 211 and the second regulating valve 221 are respectively arranged at the output ends of the first evaporator 21 and the second evaporator 22. In the process of making ice slurry, low-temperature refrigerant is provided to the first evaporator 21 and the second evaporator 22, and the water distributor 23 is opened at the same time to distribute water on the outer surfaces of the two evaporators. The water distributor 23 has two spray ends, and the two spray ends correspond to the first evaporator 21 and the second evaporator 22, respectively, so as to ensure that the outer wall surfaces of the first evaporator 21 and the second evaporator 22 are continuously kept wet. The low-temperature refrigerant will cool the first evaporator 21 to below 0°C, and absorb the heat of the water attached to the outer wall of the first evaporator 21, so that ice crystals will condense on the outer wall of the first evaporator 21. As time changes, the thickness of the ice layer condensed on the outer wall of the first evaporator 21 gradually increases until it reaches a preset thickness limit of the ice layer. At this time, the first regulating valve 211 at the output end of the first evaporator 21 is controlled to be closed, and the second regulating valve 221 at the output end of the second evaporator 22 is opened, so that the pressure in the first evaporator 21 increases, and the temperature rises, so that the first evaporator 2 The ice layer on the outer wall of the second evaporator 22 partially melts and falls into the ice storage structure 24 under the action of gravity; at the same time, the refrigerant flows through the inside of the second evaporator 22, causing the second evaporator 22 to cool down, causing the water on its outer wall to condense into an ice layer. As time changes, the thickness of the ice layer on the outer wall of the second evaporator 22 reaches the preset thickness limit, the second regulating valve 221 is closed, and the first regulating valve 211 is opened at the same time, so that the first evaporator 21 starts to make ice again according to the above working principle, and the first evaporator 21 and the second evaporator 22 operate alternately in this reciprocating cycle, thereby improving the efficiency of ice slurry making. In addition, since the ice layers on the outer surfaces of the first evaporator 21 and the second evaporator 22 fall off automatically, there is no need to set up an additional ice scraper for scraping ice, which saves the overall energy consumption of ice slurry making and is more in line with the concept of green environmental protection.

[0041] For the ice slurry system, compressor 3 is the core component, which is mainly responsible for compressing the low-temperature and low-pressure refrigerant vapor into high-temperature and high-pressure gas, thereby promoting the refrigeration cycle. It consumes electrical energy to provide power, so that the refrigerant circulates in the system, and realizes the transfer of heat from the low-temperature area (evaporator) to the high-temperature area (condenser 4), thereby achieving the effect of refrigeration and ice making. In this process, compressor 3 will consume a considerable amount of electrical energy. The energy consumption of compressor 3 is relatively high, mainly because it needs to operate continuously to maintain the high-pressure state of the refrigerant. At the same time, a large amount of heat is generated during operation. This heat requires an additional cooling system to dissipate, further increasing energy consumption. In addition, the efficiency of compressor 3 is affected by many factors, such as the characteristics of the refrigerant, the design of the system, and the operating conditions, which may lead to energy loss, making compressor 3 the component with the highest energy consumption in the ice slurry equipment.

[0042] In order to further optimize the overall energy consumption of the equipment, the technical solution of the present invention achieves energy saving by reducing the energy consumption of the compressor 3. Specifically, on the one hand, a dual cooler (i.e., the first cooler 51 and the second cooler 52 in this solution) of static and external cooling mode is used to realize the stepwise and continuous supply of deeply cooled liquid refrigerant to the evaporator; on the other hand, the gaseous refrigerant generated in the cooler is set to enter the secondary air intake channel of the compressor 3 through the circulation loop 12, thereby realizing further reduction of the power consumption of the compressor 3. Secondly, in the external cold source solution, the traditional fixed chiller evaporation temperature is changed, and a variable evaporation temperature chiller temperature change solution based on the refrigerant temperature characteristics is proposed, which is used to stably and deeply cool the refrigerant, thereby increasing the evaporation temperature of the chiller and reducing the refrigeration energy consumption of the external cooling of the refrigerant.

[0043] In the technical solution of the present invention, the refrigerant is compressed by the compressor 3 to become a high-temperature and high-pressure gaseous refrigerant, and then cooled by the condenser 4 to become a low-temperature and high-pressure liquid refrigerant; at this time, the first input valve 511 of the first cooler 51 is controlled to be opened, and the first output valve 512 is closed, and the low-temperature and high-pressure liquid refrigerant after cooling from the condenser 4 will enter the first cooler 51 for standing, and a heat exchange device is arranged inside the cooler (including the first cooler 51 and the second cooler 52), and low-temperature chilled water produced by a variable evaporation temperature refrigerator flows inside the heat exchange device, which is used for secondary cooling of the internal refrigerant, that is, deep cooling. During the cooling process, part of the refrigerant will absorb heat and become a high-temperature and low-pressure gaseous refrigerant, and the third regulating valve 513 is controlled to be opened, and this part of the gaseous refrigerant will be transported to the inlet of the compressor 3 through the circulation loop 12, so that the temperature of the refrigerant at the input end of the compressor 3 is further increased, and the range in which the compressor 3 needs to do work to increase the temperature becomes smaller, thereby reducing the working power of the compressor 3 and reducing its energy consumption.

[0044] Another part of the low-temperature liquid refrigerant enters the throttle valve 53, and is then sent to the evaporator (including the first evaporator 21 and the second evaporator 22) by the throttle valve 53 to absorb the heat of the cooled medium, and then sent to the compressor 3 for circulation. Similarly, when the refrigerant in the first cooler 51 completes deep cooling and is output to the throttle valve 53, the second input valve 521 of the second cooler 52 is opened, and the second output valve 522 is closed, and the refrigerant enters the second cooler 52 for static cooling. The gaseous refrigerant generated during the cooling process enters the circulation loop 12 to the input end of the compressor 3 for circulation by opening the fourth regulating valve 523. The first cooler 51 and the second cooler 52 perform deep secondary cooling alternately, which reduces the energy consumption of the compressor 3 and improves the utilization rate of the refrigerant cooling capacity.

[0045] In order to perform secondary cooling of the refrigerant in the cooler, the evaporative cooling module 5 also includes an air-cooled direct expansion air conditioner 54. For details, please refer to Figure 1 The air-cooled direct expansion air conditioner 54 generates low-temperature chilled water to perform secondary cooling of the internal refrigerant, i.e., deep cooling of the refrigerant. In the refrigeration cycle, the high-temperature and high-pressure refrigerant gas is discharged from the compressor 3 and enters the condenser 4. The refrigerant in the cooler releases heat to the external environment by exchanging heat with the surrounding air. The outdoor fan accelerates the air flow, improves the heat dissipation efficiency, and quickly cools and liquefies the refrigerant in the cooler, thereby completing the cooling process of the refrigerant.

[0046] In the working process of the ice making module 2, the first evaporator 21 and the second evaporator 22 need to work alternately to improve the working efficiency. This requires monitoring the temperatures of the first evaporator 21 and the second evaporator 22. In order to achieve real-time monitoring of the temperatures of the two evaporators, the present invention respectively sets a first temperature sensor and a second temperature sensor at corresponding positions of the first evaporator 21 and the second evaporator 22. For details, please refer to Figure 1 The first temperature sensor and the second temperature sensor respectively collect the real-time temperatures of the first evaporator 21 and the second evaporator 22. Taking the first evaporator 21 as an example, if the refrigerant temperature of the first evaporator 21 in actual operation (that is, the temperature information collected by the first temperature sensor) is equal to the preset refrigerant temperature when the evaporator wall is frozen, the wall of the first evaporator 21 begins to freeze; if the refrigerant temperature of the first evaporator 21 in actual operation (that is, the temperature information collected by the first temperature sensor) is lower than the preset refrigerant temperature when the evaporator wall is frozen, then the first evaporator 21 is kept cooled until the actual temperature is equal to the preset temperature, and the wall of the first evaporator 21 begins to freeze.

[0047] In order to monitor the refrigerant flow state of the main circuit 11 and / or the circulation circuit 12 in real time, a flow sensor 6 is provided on the refrigerant circulation circuit 12 of the ice slurry making equipment to ensure the stability and safety of the refrigeration system operation. Through the flow sensor 6, the equipment can accurately detect the flow of the refrigerant and promptly detect flow abnormalities (such as refrigerant leakage, insufficient or excessive flow), thereby avoiding the reduction of refrigeration efficiency, equipment damage or unstable ice slurry quality caused by refrigerant flow problems. In addition, the data of the flow sensor 6 can also be used to optimize the system operation parameters, achieve energy-saving control, and improve the overall performance and service life of the equipment.

[0048] In order to provide water source to the water distributor 23, the ice slurry preparation system 100 also includes a water supply module, which includes a water storage tank 26 and a water pump 261. The water storage tank 26 is connected to the water distributor 23. The water pump 261 is used to pump the water in the water storage tank 26 to the water distributor 23. In order to realize water circulation, a water recovery tank 25 is provided below the two evaporators. The water recovery tank 25 is arranged on the side of the ice storage structure 24 facing away from the water distributor 23. The ice storage structure 24 is provided with a filter hole, and the water recovery tank 25 is connected to the water storage tank 26. The ice crystals falling off the outer wall of the evaporator will fall on the ice storage structure 24, and will be transported to the ice storage structure 7 through the ice slurry transportation channel on one side of the ice storage structure 24 for storage. The partially thawed water will drip into the water recovery tank 25 through the filter hole, and then flow into the water storage tank 26 through the water recovery tank 25 to achieve recovery. The water consumption of the system is reduced.

[0049] The present invention also proposes a method for alternately preparing ice slurry, which is applied to the ice slurry preparation system 100 as described above, and the method comprises the following steps: S1: obtaining the refrigerant temperature T when the evaporator wall is frozen, the refrigerant temperature T1 of the first evaporator 21 in actual operation, and the refrigerant temperature T2 of the second evaporator 22 in actual operation; S2: judging whether T1 is equal to T, if T1=T, the wall of the first evaporator 21 begins to freeze; if T1<T, continue to wait until T1=T; S3: obtaining the preset thickness limit value H of the evaporator wall ice, the actual thickness H1 of the first evaporator 21 wall ice, and the actual thickness H2 of the second evaporator 22 wall ice; S4: judging whether H1 is equal to H, if H1=H , then stop supplying refrigerant to the first evaporator 21, close the first regulating valve 211, and the pressure in the first evaporator 21 continues to increase, thereby generating a temperature rise; if 0

[0050] Through the method of alternately preparing ice slurry, the power consumption of the unit's refrigeration operation is reduced, the unit's refrigeration energy efficiency is improved, the evaporation temperature is increased, the refrigeration capacity is significantly increased, and the energy efficiency of the refrigeration device is greatly improved. The ice layer thickness of this system is small, and the evaporation temperature of the system unit is relatively high at -1°C, which is about 5 to 9°C higher than the evaporation temperature of the conventional ice sheet sliding dynamic ice storage unit (-10°C to -6°C), and the unit efficiency can be increased by about 3% for every 1°C increase in evaporation temperature. When the refrigeration system described in the present invention is adopted, the variable evaporating temperature refrigerator can continuously adjust the refrigerator evaporation temperature. The outlet temperature of the condenser 4 is 42°C. The refrigerant in the cooler needs to be left to stand and cooled to -3°C. Part of the refrigerant phase changes and absorbs heat during the standing process, so that the 42°C liquid refrigerant is reduced to 30°C. The evaporating temperature of the variable evaporating temperature refrigerator is adjusted in turn, so that the refrigerant in the cooler is gradually reduced to -3°C. During the refrigeration process of the external refrigerator, the energy efficiency of the variable evaporating temperature refrigerator is: COP1 = [1 + 4% * ((25-3) / 2 + 10)] * 2.5 = 4.6. After adopting the ice slurry preparation system 100 of the present invention, the overall energy consumption is: COP2 = 1 + 5% * ((4.6 + 2.5) / 2 = 3.73. The energy efficiency is improved to: η = (3.73-2.5) / 2.5 = 49.2%.

[0051] ​The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. An ice slurry preparation system, characterized in that: It includes an ice-making module, a compressor, a condenser and an evaporative cooling module which are sequentially connected through a main circuit; The ice-making module comprises a first evaporator, a second evaporator, a first regulating valve, a second regulating valve, a water distributor and an ice storage structure, the first evaporator and the second evaporator are arranged in parallel in the main circuit, and the first regulating valve and the second regulating valve are respectively arranged at the output ends of the first evaporator and the second evaporator; The variable evaporative cooling module includes a first cooler, a second cooler, a first input valve, a second input valve, a first output valve, a second output valve and a throttle valve. The first cooler and the second cooler are arranged in parallel in the main circuit. The first input valve and the first output valve are respectively arranged at the input end and the output end of the first cooler, the second input valve and the second output valve are respectively arranged at the input end and the output end of the second cooler, and the throttle valve is arranged in the main circuit and is located between the variable evaporative cooling module and the ice-making module.

2. The ice slurry preparation system according to claim 1, characterized in that: The ice slurry preparation system further includes a water supply module, the water supply module includes a water storage tank and a water pump, the water storage tank is connected to the water distributor, and the water pump is used to pump water in the water storage tank to the water distributor; The water distributor has two spray ends, and each of the spray ends is respectively arranged toward one of the evaporators.

3. The ice slurry preparation system according to claim 2, characterized in that: The ice-making module further includes a first temperature sensor and a second temperature sensor. The first temperature sensor and the second temperature sensor are electrically connected to the first evaporator and the second evaporator respectively and are used to monitor the temperature of each evaporator.

4. The ice slurry preparation system according to claim 2, characterized in that: The water supply module further comprises a water recovery tank, which is arranged on a side of the ice storage structure facing away from the water distributor, the ice storage structure is provided with a filtering hole, and the water recovery tank is communicated with the water storage tank.

5. The ice slurry preparation system according to any one of claims 1 to 4, characterized in that: The ice slurry preparation system also includes a circulation loop, one end of which is connected to the first cooler and the second cooler respectively, and the other end is connected to the input end of the compressor. The circulation loop is provided with a third regulating valve corresponding to the first cooler and a fourth regulating valve corresponding to the second cooler respectively.

6. The ice slurry preparation system according to claim 5, characterized in that: The variable evaporative cooling module also includes an air-cooled direct expansion air conditioner, which is connected to the first cooler and the second cooler respectively to perform secondary cooling on the refrigerant.

7. The ice slurry preparation system according to any one of claims 1 to 4, characterized in that: The ice slurry preparation system further includes a flow sensor, which is arranged in the main circuit and located between the compressor and the condenser.

8. The ice slurry preparation system according to any one of claims 1 to 4, characterized in that: The ice slurry preparation system further includes an ice storage structure, and the ice storage structure is connected to the ice storage structure through an ice slurry transportation channel.

9. A method for alternately preparing ice slurry, applied to the ice slurry preparation system according to any one of claims 1 to 8, characterized in that: include: Obtaining the refrigerant temperature T when the evaporator wall is frozen, the refrigerant temperature T1 of the first evaporator in actual operation, and the refrigerant temperature T2 of the second evaporator in actual operation; Determine whether T1 is equal to T. If T1=T, the wall surface of the first evaporator begins to freeze; if T1<T, continue to wait until T1=T; Obtaining a preset thickness limit value H of ice on the evaporator wall, an actual thickness H1 of ice on the first evaporator wall, and an actual thickness H2 of ice on the second evaporator wall; It is determined whether H1 is equal to H. If H1=H, the first regulating valve is closed to make the refrigerant in the first evaporator in a static pressure increase state; if 0<H1<H, ice making is continued.

10. The method for alternately preparing ice slurry according to claim 9, characterized in that: The step of judging whether H1 is equal to H, if H1=H, closing the first regulating valve to make the refrigerant in the first evaporator in a static pressure rise; if 0<H1<H, then continuing to make ice further includes: If H1=H, control the refrigerant to enter the second evaporator; Determine whether T2 is equal to T. If T2=T, the wall surface of the second evaporator begins to freeze; if T2<T, continue to wait until T2=T; Determine whether H2 is equal to H. If H2=H, close the second regulating valve to make the refrigerant in the second evaporator in a static pressure increase, and at the same time start the refrigerant supply to the first evaporator; if 0<H2<H, continue to make ice.

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