Supercooled water stable supply system and control method

Abstract

The invention relates to a supercooled water stable supply system and a control method, the supercooled water stable supply system comprises a water supply device, a first-stage cooling device, a second-stage cooling device, a third-stage cooling device, a fourth-stage cooling device and a supercooled water storage device arranged in a third-stage cooling device which are arranged in sequence, normal-temperature water enters the first-stage cooling device, the second-stage cooling device, the third-stage cooling device and the fourth-stage cooling device which are arranged in different-temperature refrigerant environments under the pressure effect of the water supply device to be gradually reduced to the target temperature, the temperature control device monitors and feeds back the target temperature difference between the normal-temperature water and supercooled water in the water storage device, and then the refrigerant environment temperature is regulated and controlled. Therefore, stable supply of supercooled water with required flow and temperature is realized. According to the supercooled water supply device, temperature and flow can be controlled, and meanwhile stable supply of supercooled water within the flow of 0.1 L / h or above and the temperature range of 0-13 DEG C can be stably achieved.

Description

Technical Field

[0001] The present invention relates to a technology in the field of icing test, in particular to a temperature- and flow-controllable supercooled water stable supply system and a control method. Background Art

[0002] The icing experiment simulating real supercooled fog and the supercooled water dynamic ice-making technology both require supercooled water supply. The metastable characteristics of supercooled water make it easy for large volumes of supercooled water to freeze, which makes it difficult to control the ice blockage in the transportation pipeline, which will cause the supercooled water supply system to be interrupted. In particular, the demand for large-flow, high-supercooling supercooled water supply is difficult to meet, so the supply of supercooled water with stable temperature and flow and the reduction of ice blockage are the difficulties that this technology needs to solve urgently. At present, there is an urgent need for a stable and large-volume supercooled water supply technology. Summary of the invention

[0003] In view of the problems in the prior art that low temperature of supercooled water, large flow rate stable supply and ice blockage may easily occur during the production stage and cause system interruption, as well as the inability to achieve stable supply of supercooled water with a high degree of supercooling (-12°C), the present invention proposes a supercooled water stable supply system and control method, which can achieve controllable temperature and flow rate while stably providing supercooled water with a flow rate of more than 0.1L / h and a temperature range of 0 to -13°C.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention relates to a stable supply system for supercooled water, comprising: a water supply device, first to fourth multi-stage cooling devices, and a supercooled water storage device arranged in the third cooling device, wherein: at least one output end of each cooling device and the supercooled water storage device is provided with a temperature control device, and normal temperature water enters the first to fourth cooling devices arranged in different temperature refrigerant environments under the pressure of the water supply device and gradually decreases to a target temperature, and the temperature control device monitors and feeds back the target temperature difference of the supercooled water in the water storage device, and then regulates the refrigerant environment temperature, thereby achieving a stable supply of supercooled water with a required flow rate and temperature.

[0006] The water supply equipment comprises a normal temperature water storage tank and a peristaltic pump connected thereto.

[0007] The second-stage cooling device includes: at least one cavity filled with a first refrigerant and a spiral pipeline arranged in the cavity, wherein: a heating film is provided outside the cavity and the temperature control device forms a gradient temperature environment, and the inlet height of the spiral pipeline located in the first refrigerant is greater than the outlet height, so that the temperature of the supercooled water is reduced from 0°C at the inlet to the first target temperature before being output.

[0008] The third-stage cooling device is filled with a second refrigerant, wherein the supercooled water storage device is immersed in the second refrigerant, and the temperature of the supercooled water is reduced to a second target temperature under the low-temperature refrigerant environment.

[0009] The fourth-stage cooling device is a container with a cooling chamber, and a third refrigerant is filled between the cooling chamber and the container, wherein: the supercooled water is cooled by air convection heat exchange in the low-temperature environment of the refrigerant in the cooling chamber, and the supercooled water temperature is reduced to the third target temperature in this low-temperature refrigerant environment. Technical Effects

[0010] The present invention adopts multi-stage cooling and multi-path parallel connection methods to achieve a stable supply of 0.1L / h, -12°C, and 45 minutes of supercooled water under single-path application; when two-path parallel connection is adopted, the stable supply flow rate of supercooled water is doubled (0.2L / h) or another path is opened after one path is blocked by ice to double the supercooled water supply time (90 minutes). BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the structure of the present invention;

[0012] Figure 2 is a schematic diagram of the second stage cooling device;

[0013] Figure 3 is a schematic diagram of the third stage cooling device;

[0014] Figure 4 is a schematic diagram of the fourth stage cooling device;

[0015] Figure 5 It is a schematic diagram of the temperature control method in the system;

[0016] Figure 6 This is a schematic diagram of a multi-channel parallel structure of an embodiment;

[0017] Figure 7 Temperature fluctuation curve for stable supply of supercooled water;

[0018] Figure 8 The temperature fluctuation curve when two parallel supercooled water is stably supplied;

[0019] In the figure: ordinary drinking water 1, ultrapure water machine 2, peristaltic pumps 3-1, 3-2, valves 4-1 to 4-14, first-stage cooling device 5, water storage device 6, temperature control device 7, 7-1 to 7-13, spiral pipes 8, 8-1 to 8-6, second-stage cooling device 9, third-stage cooling device 10, water storage tanks 11-1 to 11-4, fourth-stage cooling device 12, heating film 13, first to third refrigerants 14-1 to 14-3. DETAILED DESCRIPTION Example 1

[0020] like Figure 1 As shown, the present embodiment involves a single-path supercooled water stable supply system, comprising: a water supply device - peristaltic pumps 3-1 and 3-2, first to fourth stage cooling devices 5, 9, 10, 12 arranged in sequence, and at least one supercooled water storage device 11 arranged in the third stage cooling device 10, wherein: the output end of each stage cooling device and the supercooled water storage device is provided with a temperature control device 7, 7-1 to 7-7, and normal temperature water enters the first to fourth stage cooling devices 5, 9, 10, 12 with different temperature refrigerant environments under the pressure of the water supply device, and gradually decreases to the target temperature, and the temperature control device 7 monitors and feeds back the target temperature difference with the supercooled water in the supercooled water storage device - pipeline 8, 11, and then regulates the refrigerant environment temperature, thereby achieving the required flow rate and temperature supercooled water stable supply.

[0021] In this embodiment, the first-stage cooling device 5 is implemented by a freezer, so that the temperature of the water in the water storage device 6 is cooled to between 0 and 0.5° C., and the output end temperature T0 is monitored by the temperature control device 7 .

[0022] like Figure 2 As shown, the second-stage cooling device 9 includes: at least one cavity filled with a first refrigerant 14-1, and a spiral pipeline 8 arranged in the cavity. The first refrigerant 14-1 (shaded area) realizes the reduction of the temperature of the supercooled water in the gradient pipeline 8 from 0°C to the first target temperature.

[0023] The cavity is provided with temperature control devices 7, 7-1 to 7-3 for recording the gradient temperature distribution and the outlet temperature T1.

[0024] A heating film 13 is provided on the top of the second-stage cooling device 9 .

[0025] The spiral pipeline 8 in the gradient temperature environment adopts the currently used spiral method that can increase the length of the pipeline.

[0026] like Figure 3 As shown, the third-stage cooling device 10 is filled with a second refrigerant 14-2 and is provided as temperature control devices 7-4 and 7-5, wherein: the supercooled water storage device 11 is immersed in the second refrigerant 14-2, and the supercooled water temperature is reduced to the second target temperature T2 under the low-temperature refrigerant environment.

[0027] like Figure 4 As shown, the fourth-stage cooling device 12 is a container with a cooling chamber, the cooling chamber and the container are filled with a third refrigerant 14-3 and are provided as temperature control devices 7-6 and 7-7, wherein: the supercooled water is cooled by air convection heat exchange in the low-temperature environment of the refrigerant in the cooling chamber, and the supercooled water temperature is reduced to the third target temperature T3 in this low-temperature refrigerant environment.

[0028] like Figure 5 As shown, this embodiment relates to a temperature control method of the above-mentioned single-path supercooled water stable supply system, comprising:

[0029] Step 1: Use the second-level gradient temperature distribution to gradually cool the water above 0°C at the inlet to the first target temperature of the outlet temperature measured by 7-3; when the result measured by 7-3 does not reach the first target temperature, change the refrigerant temperature 7-2, and based on the feedback of the upper and lower temperatures 7-1 and 7-2, control the output power P of the heating film, and adjust the temperature gradient in the device so that the supercooled water reaches the first target temperature T1 of the outlet temperature measured by 7-3.

[0030] The temperature gradient Among them: Based on the cooling rate when supercooled water at different temperatures can be stably maintained, it is calculated H is the height of the second stage cooling device 9, v cooling is the cooling rate of the supercooled water, R is the radius of the spiral pipe 8, L is the length of the spiral pipe 8, and Q is the flow rate of the supercooled water in the spiral pipe 8.

[0031] The first target temperature Where: T0 is the inlet temperature of the second stage cooling device 9, the temperature of the first refrigerant 14-1 η is the refrigerant temperature efficiency value, the output power of the heating film C re is the specific heat capacity of the refrigerant, ρ re is the density of the refrigerant, Q re is the flow rate of refrigerant.

[0032] Step 2: The supercooled water is cooled to the second target temperature T2 under the influence of the second refrigerant 14-2 of the third-stage cooling device; when the result measured by the temperature control device 7-5 does not reach the second target temperature, the temperature of the temperature control device 7-4 is changed so that the supercooled water reaches the second target temperature T2 of the outlet temperature measured by the temperature control device 7-5, and the temperature of the second refrigerant 14-2 is η is the refrigerant temperature efficiency value.

[0033] Step 3: The supercooled water is cooled to the third target temperature T3 under the influence of the third refrigerant 14-3 of the fourth-stage cooling device; when the result measured by the temperature control device 7-7 does not reach the second target temperature, the temperature of the temperature control device 7-6 is changed so that the supercooled water reaches the third target temperature of the outlet temperature measured by the temperature control device 7-7, and the temperature of the third refrigerant 14-3 is η is the refrigerant temperature efficiency value. At this time, the supercooled water temperature reaches the target temperature, and the system can provide supercooled water with a certain flow rate and temperature through the water supply device 3-2. Example 2

[0034] like Figure 6 As shown, compared with Example 1, the supercooled water stable supply system involved in this embodiment adopts multiple parallel second-stage cooling devices 9, multiple parallel supercooled water storage devices 11 arranged in the third-stage cooling device 10, and a fourth-stage cooling device 12 with parallel pipelines.

[0035] When the spiral pipes 8-3 to 8-6 are working normally, the flow rate of the supercooled water supply is four times that of a single path when the temperature is the same; and the blockage caused by ice formation during the water cooling process can be reduced as much as possible, ensuring that there is always a supercooled water flow path to achieve a stable supply of supercooled water.

[0036] When the water storage pipeline or water storage tank 11-1 between valves 4-5 and 4-9 detects the presence of ice and ice blockage based on the temperature feedback in the temperature control device, the temperature in the temperature control device 7-8 rises rapidly due to the release of latent heat of supercooled water freezing and generates an alarm feedback. At this time, valves 4-5 and 4-9 will become closed, closing the pipeline 8-3 that has been blocked by ice to prevent it from causing ice blockage in other pipelines. The other three pipelines 8-4, 8-5 / 8-6 can continue to work. At the same time, in order to ensure the stability of the output temperature and flow rate, it is necessary to feedback the outlet temperature measured by the temperature control devices 7-3, 7-6, 7-9, 7-10, 7-11, 7-13, and 7-14 at each level, and adjust the refrigerant temperature of the cooling device at each level through the temperature control devices 7-2, 7-5, 7-7, and 7-12 to ensure that the final outlet temperature 7-13 and 7-14 are stable within the target temperature range.

[0037] When the number of pipelines blocked by ice exceeds 50% of the total number of pipelines, the flow rate needs to be reduced accordingly to ensure that the temperature of the supercooled water supplied at the output end is stable within the target temperature range. At this time, supercooled water can still be supplied until all pipelines are blocked by ice.

[0038] The present embodiment relates to a method for producing supercooled water of the above-mentioned system, comprising: ordinary drinking water 1 is used to prepare pure water for laboratory use through an ultrapure water machine 2, and is pressed into water storage bottles 6, 11 and water storage pipelines 8 in cooling devices at various levels through peristaltic pumps 3-1 and 3-2, and the water supply is stopped. Then, the refrigerant temperature in the corresponding device is cooled according to the target temperature of the supercooled water in the cooling devices at various levels. At this time, the supercooled water temperature is also cooled due to the influence of the ambient temperature. When the temperature control device 7 for monitoring the supercooled water temperature in the cooling device reaches the target temperature, the peristaltic pump presses the supercooled water out of the water storage device at the target required flow rate. At this time, the system performs feedback through the supercooled water temperature control devices 7, 7-3, 7-5, and 7-7 at various levels. If the target temperature is not reached, as shown in FIG. Figure 5As shown, the refrigerant temperature in each cooling device is further regulated by temperature control devices 7-1, 7-2, 7-4, and 7-6, so that the subcooled water temperature at the output end of each cooling device reaches the target range, and finally the subcooled water temperature and flow rate provided by the device reach the target value.

[0039] After specific actual experiments, under a single-path supercooled water supply system, under different temperature refrigerant environment settings at different levels, the above device / method is operated with ultrapure water at a temperature of 0.5°C and a flow rate of 0.1L / h, and a stable supply of 0.1L / h, -12°C, and 45 minutes of supercooled water can be obtained. Depending on the target temperature, different levels of combined cooling solutions can be selected, such as Figure 7 As shown. When the invention adopts a single-path supercooled water stable supply system and the supercooled water temperature is -6°C, the invention only needs a secondary cooling solution to be implemented. At this time, the supercooled water supply flow rate is 0.2L / h, and the flow rate is calculated by the volume of supercooled water flowing out of the output end per unit time. The results show that the supercooled water temperature rises in the initial stage. Based on the feedback of the temperature control device 7-3, the temperature distribution 7-1 and 7-2 of the second-stage refrigerant device are regulated, so that the final supercooled water supply temperature is basically stable around -6°C, and its temperature fluctuation is within 0.6°C. When the temperature required for supplying supercooled water is -12.5°C, the invention needs to adopt a four-stage cooling scheme, in which the target temperature of the second-stage cooling device is set to -6±0.5°C, the target temperature of the third-stage cooling device is -9±0.5°C, and the target temperature of the fourth-stage cooling device is -12.5±0.6°C. At this time, the supercooled water supply flow rate is 0.1L / h. The supercooled water temperature also rises in the initial stage. Based on the result feedback of the temperature control devices 7-3, 7-5, and 7-7, the refrigerant temperatures 7-1, 7-2, 7-4, and 7-6 at each level are regulated, so that the final supercooled water supply temperature is basically stable, and the supercooled water temperature fluctuates within 1°C thereafter. A two-way parallel supercooled water stable supply system, such as Figure 6 As shown in FIG. 1 , it is possible to open another supercooled water path after one path is blocked by ice, so that the stable supply time of supercooled water is doubled (90 minutes). Figure 8 As shown, the third target temperature T3 measured by 7-13 and 7-14 in the fourth stage cooling device is -12±1°C.

[0040] Compared with the prior art, the device achieves continuous supply of lower-temperature supercooled water through a multi-stage cooling device and increases the supercooled water supply flow rate through a multi-way parallel connection and avoids ice blockage caused by supercooled water freezing and affecting the supercooled water supply. The method and device provided by the present invention can operate in normal temperature and low temperature environments, stably supply supercooled water, and have a wide range of applications.

[0041] The above-mentioned specific implementation can be partially adjusted in different ways by those skilled in the art without departing from the principle and purpose of the present invention. The protection scope of the present invention shall be based on the claims and shall not be limited by the above-mentioned specific implementation. Each implementation scheme within its scope shall be subject to the constraints of the present invention.

Claims

1. A supercooled water stable supply system, characterized in that: include: A water supply device, a first to fourth stage multi-stage cooling device and a supercooled water storage device arranged in the third stage cooling device are arranged in sequence, wherein: at least one of the output ends of each stage cooling device and the supercooled water storage device are provided with a temperature control device, and normal temperature water enters the first to fourth stage cooling devices arranged in different temperature refrigerant environments under the pressure of the water supply device and gradually decreases to the target temperature, and the temperature control device monitors and feeds back the target temperature difference of the supercooled water in the water storage device, and then regulates the refrigerant environment temperature, thereby achieving a stable supply of supercooled water with the required flow rate and temperature.

2. The supercooled water stable supply system according to claim 1, characterized in that: The second-stage cooling device comprises: at least one cavity filled with a first refrigerant and a spiral pipe arranged in the cavity, wherein: a heating film is arranged outside the cavity and the temperature control device forms a gradient temperature environment, and the inlet height of the spiral pipe located in the first refrigerant is greater than the outlet height, so that the temperature of the supercooled water is reduced from 0°C at the inlet to the first target temperature before being output; The temperature gradient Among them: Based on the cooling rate when supercooled water at different temperatures can be stably maintained, it is calculated H is the height of the second stage cooling device 9, v cooling is the cooling rate of supercooled water, R is the radius of the spiral pipe, L is the length of the spiral pipe, and Q is the flow rate of supercooled water in the spiral pipe.

3. The supercooled water stable supply system according to claim 1 is characterized in that: The third-stage cooling device is filled with a second refrigerant, wherein: the supercooled water storage device is immersed in the second refrigerant, and the supercooled water temperature is reduced to a second target temperature under the low-temperature refrigerant environment.

4. The supercooled water stable supply system according to claim 1, characterized in that: The fourth-stage cooling device is a container with a cooling chamber, and a third refrigerant is filled between the cooling chamber and the container, wherein: the supercooled water is cooled by air convection heat exchange in the low-temperature environment of the refrigerant in the cooling chamber, and the supercooled water temperature is reduced to the third target temperature in this low-temperature refrigerant environment.

5. The supercooled water stable supply system according to claim 1 is characterized in that: The first-stage cooling device is implemented by a freezer, so that the temperature of the water in the water storage device is cooled to between 0 and 0.5° C., and the output end temperature T0 is monitored by a temperature control device.

6. The supercooled water stable supply system according to claim 1, characterized in that: The multi-stage cooling device adopts a cooling method in a gradient temperature environment, a refrigerant immersion cooling method, and a refrigerant air heat convection cooling method. Depending on the target temperature, a combined cooling solution of different levels and cooling methods can be selected.

7. The supercooled water stable supply system according to claim 1, characterized in that: The at least one refers to: using multiple parallel second-stage cooling devices, multiple parallel supercooled water storage devices arranged in the third-stage cooling device, and a fourth-stage cooling device with parallel pipelines.

8. The temperature control method of the system according to any one of claims 1 to 6, characterized in that: include: Step 1: Using the second-stage gradient temperature distribution, the water above 0°C at the inlet is gradually cooled to reach the first target temperature of the measured outlet temperature; When the measured result does not reach the first target temperature, the refrigerant temperature is changed, and based on the upper and lower temperatures and feedback, the output power P of the heating film is controlled to adjust the temperature gradient in the device so that the supercooled water reaches the first target temperature T1 of the measured outlet temperature; The first target temperature Where: T0 is the inlet temperature of the second stage cooling device 9, the temperature of the first refrigerant 1 η is the refrigerant temperature efficiency value, the output power of the heating film C re is the specific heat capacity of the refrigerant, ρ re is the density of the refrigerant, Q re is the flow rate of refrigerant; Step 2: The supercooled water is cooled to the second target temperature T2 under the influence of the second refrigerant in the third-stage cooling device; when the result measured by the temperature control device does not reach the second target temperature, the temperature of the temperature control device is changed so that the supercooled water reaches the second target temperature T2 of the outlet temperature measured by the temperature control device, and the temperature of the second refrigerant is η is the refrigerant temperature efficiency value; Step 3: The supercooled water is cooled to a third target temperature T3 under the influence of the third refrigerant in the fourth stage cooling device; when the result measured by the temperature control device does not reach the second target temperature, the temperature of the temperature control device is changed so that the supercooled water reaches the third target temperature of the outlet temperature measured by the temperature control device, and the temperature of the third refrigerant is η is the refrigerant temperature efficiency value; at this time, the supercooled water temperature reaches the target temperature, and the system can provide supercooled water with a certain flow rate and temperature through the water supply device.

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