Supercooled water stable supply system and control method

Abstract

The application discloses a supercooled water stable supply system and a control method, which comprises a water supply device, first to fourth stage multi-stage cooling devices arranged in sequence and a supercooled water storage device arranged in the third stage cooling device, wherein the output ends of at least one of each stage cooling device and the supercooled water storage device are provided with temperature control devices, normal temperature water enters the first to fourth stage cooling devices arranged in different temperature cooling medium environments under the pressure of the water supply device and is gradually reduced to a target temperature, the temperature control devices monitor and feedback the target temperature gap of the supercooled water in the water storage device, and then the temperature of the cooling medium environment is regulated, so that the required flow and temperature supercooled water can be stably supplied. The application can realize the stable supply of the supercooled water with the flow of more than 0.1 L / h and the temperature in the range of 0 to -13 DEG C while the temperature and flow are controllable.

Description

Technical Field

[0001] This invention relates to a technology in the field of icing tests, specifically a stable supply system and control method for subcooled water with controllable temperature and flow rate. Background Technology

[0002] Both simulating icing experiments in real supercooled clouds and dynamic ice-making technology using supercooled water require a supply of supercooled water. The metastable nature of supercooled water makes large volumes prone to freezing, leading to uncontrollable ice blockage in transport pipelines and causing intermittent supply disruptions. Meeting the demand for high-flow-rate, highly supercooled supercooled water is particularly challenging. Therefore, stabilizing the temperature and flow rate of supercooled water and reducing ice blockage are critical challenges that need to be addressed. Currently, there is an urgent need for a stable, high-volume supercooled water supply technology. Summary of the Invention

[0003] This invention addresses the problems of existing technologies, such as the easy occurrence of low-temperature, high-flow-rate, and stable supply of subcooled water during the production stage, as well as system interruptions caused by ice blockage and the inability to achieve a stable supply of subcooled water with high subcooling degree (-12℃). It proposes a stable subcooled water supply system and control method that can achieve a stable supply of subcooled water with a flow rate of more than 0.1L / h and a temperature range of 0 to -13℃ while controlling the temperature and flow rate.

[0004] This invention is achieved through the following technical solution:

[0005] This invention relates to a stable subcooled water supply system, comprising: a water supply device, a first to fourth stage multi-stage cooling device, and a subcooled water storage device disposed in a third stage cooling device, wherein: at least one stage cooling device and the subcooled water storage device are equipped with a temperature control device at their output ends; ambient temperature water enters the first to fourth stage cooling devices, which are set in different temperature refrigerant environments, under the pressure of the water supply device and is gradually cooled to the target temperature; the temperature control device monitors and provides feedback on the temperature difference between the subcooled water and the target temperature in the water storage device, thereby regulating the temperature of the refrigerant environment to achieve a stable supply of subcooled water at the required flow rate and temperature.

[0006] The water supply equipment includes a room 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 pipe disposed within the cavity, wherein: a heating film and the temperature control device are provided outside the cavity to form 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 subcooled water is reduced from 0°C at the inlet to the first target temperature before being output.

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

[0009] The fourth cooling device is a container with a cooling cavity, and the cooling cavity and the container are filled with the third coolant, wherein the supercooled water is cooled by air convection heat exchange in the low-temperature coolant environment of the cooling cavity, and the temperature of the supercooled water is reduced to the third target temperature in the low-temperature coolant environment.

[0010] Technical effects

[0011] The application adopts multi-stage cooling and multi-path parallel methods to realize stable supply of 0.1L / h, -12℃, 45 minutes of supercooled water in a single path application; when two paths are used in parallel, the stable supply of supercooled water is doubled (0.2L / h) or the supply time of supercooled water is doubled (90 minutes) after one path is blocked. BRIEF DESCRIPTION OF DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the application;

[0013] Figure 2 It is a schematic diagram of the second cooling device;

[0014] Figure 3 It is a schematic diagram of the third cooling device;

[0015] Figure 4 It is a schematic diagram of the fourth cooling device;

[0016] Figure 5 It is a schematic diagram of the temperature control method in the system;

[0017] Figure 6 It is a schematic diagram of the multi-path parallel structure of the embodiment;

[0018] Figure 7 It is a temperature fluctuation curve when the supercooled water is stably supplied;

[0019] Figure 8 It is a temperature fluctuation curve when the supercooled water is stably supplied in a two-path parallel mode;

[0020] In the figure: ordinary drinking water 1, ultrapure water machine 2, peristaltic pump 3-1, 3-2, valve 4-1~4-14, first-stage cooling device 5, water storage device 6, temperature control device 7, 7-1~7-13, spiral pipe 8, 8-1~8-6, second-stage cooling device 9, third-stage cooling device 10, water storage tank 11-1~11-4, fourth-stage cooling device 12, heating film 13, first to third coolants 14-1~14-3. DETAILED DESCRIPTION

[0021] Example 1

[0022] like Figure 1 As shown, this embodiment relates to a single-path subcooled water stable supply system, including: a water supply device-peristaltic pumps 3-1 and 3-2 arranged sequentially, first to fourth stage cooling devices 5, 9, 10, and 12, and at least one subcooled water storage device 11 disposed in the third stage cooling device 10. Each stage cooling device and subcooled water storage device is equipped with a temperature control device 7, 7-1 to 7-7 at its output end. Under the pressure of the water supply device, room temperature water enters the first to fourth stage cooling devices 5, 9, 10, and 12 with different temperature refrigerant environments, gradually decreasing to the target temperature. The temperature control device 7 monitors and provides feedback on the temperature difference between the subcooled water in the subcooled water storage device-pipeline 8 and 11 and the target temperature, thereby regulating the temperature of the refrigerant environment to achieve a stable supply of subcooled water with the required flow rate and temperature.

[0023] In this embodiment, the first-stage cooling device 5 is implemented using a freezer, which cools the water temperature in the water storage device 6 to between 0 and 0.5°C, and its output temperature T0 is monitored by the temperature control device 7.

[0024] 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 pipe 8 disposed in the cavity. The first refrigerant 14-1 (shaded area) reduces the temperature of the subcooled water in the gradient pipe 8 from 0°C to a first target temperature.

[0025] The cavity is equipped with temperature control devices 7, 7-1 to 7-3, which are used to record the gradient temperature distribution and the outlet temperature T1.

[0026] The second-stage cooling device 9 is provided with a heating film 13 on its top.

[0027] The spiral pipeline 8 in the gradient temperature environment adopts the spiral method that can increase the pipeline length, which is currently in use.

[0028] like Figure 3 As shown, the third-stage cooling device 10 is filled with a second refrigerant 14-2 and is equipped with temperature control devices 7-4 and 7-5. The subcooled water storage device 11 is immersed in the second refrigerant 14-2, and the temperature of the subcooled water is reduced to the second target temperature T2 under the low-temperature refrigerant environment.

[0029] like Figure 4As shown, the fourth cooling device 12 is a container with a cooling cavity, the cooling cavity and the container are filled with the third coolant 14-3 and are provided as temperature control devices 7-6, 7-7, wherein: the supercooled water is cooled by air convection heat exchange under the low-temperature environment of the coolant in the cooling cavity, and the temperature of the supercooled water is reduced to the third target temperature T3 under the low-temperature coolant environment.

[0030] As shown, the temperature control method of the single-path supercooled water stable supply system in the embodiment includes: Figure 5 As shown, the temperature control method of the single-path supercooled water stable supply system in the embodiment includes:

[0031] Step 1, the water above 0℃ at the inlet is gradually cooled to the first target temperature of the outlet temperature measured by 7-3 through the second-stage gradient temperature distribution; when the measured result by 7-3 does not reach the first target temperature, the coolant temperature 7-2 is changed, and based on the temperature feedback of the upper and lower sides 7-1, 7-2, the temperature gradient in the device is adjusted by controlling the output power P of the heating film, so that the supercooled water reaches the first target temperature T1 of the outlet temperature measured by 7-3.

[0032] The temperature gradient Wherein: the cooling rate of the supercooled water that can be stably maintained based on different temperatures is calculated H is the height of the second 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 of the supercooled water in the spiral pipe 8.

[0033] The first target temperature Wherein: T0 is the inlet temperature of the second cooling device 9, and the temperature of the first coolant 14-1 η is the coolant temperature efficiency value, and the output power of the heating film C re is the specific heat capacity of the coolant, ρ re is the density of the coolant, Q re is the flow of the coolant.

[0034] Step 2, the supercooled water is cooled to the second target temperature T2 under the influence of the third cooling device second coolant 14-2; when the measured result of 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 coolant 14-2 η is the coolant temperature efficiency value.

[0035] Step 3, the subcooled 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 measured result of 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 subcooled 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 η is the refrigerant temperature efficiency value. At this time, the subcooled water temperature reaches the target temperature, and the system can provide a certain flow and temperature of subcooled water through the water supply device 3-2.

[0036] Example 2

[0037] As Figure 6 shown, compared with example 1, the subcooled water stable supply system of the present embodiment adopts multiple parallel second stage cooling devices 9, multiple parallel subcooled water storage devices 11 arranged in the third stage cooling device 10, and a fourth stage cooling device 12 with parallel pipelines.

[0038] When the spiral pipelines 8-3~8-6 are all working normally, the flow of subcooled water supply at the same temperature is four times that of a single path; and the freezing caused by water cooling process can be reduced as much as possible to ensure that there is always a flowing subcooled water path to realize stable supply of subcooled water.

[0039] When the water storage pipeline or water storage tank 11-1 between the valves 4-5, 4-9 has ice blocking phenomenon due to the detection of ice freezing based on the temperature feedback of the temperature control device, the temperature in the temperature control device 7-8 quickly rises to generate alarm feedback due to the release of latent heat of subcooled water freezing, at this time the valves 4-5, 4-9 will be in closed state, closing the pipeline 8-3 which has ice blocking phenomenon to avoid causing ice blocking in other pipelines, the other three pipelines 8-4, 8-5 / 8-6 can still continue to work, at the same time, in order to ensure the stability of the outlet temperature and flow, the outlet temperature feedback measured by the temperature control devices 7-3, 7-6, 7-9, 7-10, 7-11, 7-13, 7-14 is needed, and the temperature of the refrigerant of each stage cooling device is adjusted through the temperature control devices 7-2, 7-5, 7-7, 7-12 to ensure that the final outlet temperature 7-13, 7-14 is stable in the target temperature range.

[0040] When the ice blocking pipeline is more than 50% of the total number of pipelines, the flow needs to be reduced accordingly to stabilize the temperature of the subcooled water supplied at the outlet within the target temperature range, at this time the subcooled water can still be supplied until all the pipelines are blocked by ice.

[0041] The embodiment relates to a supercooled water production method of the system, which comprises the following steps: normal drinking water 1 is prepared into laboratory pure water by an ultrapure water machine 2, and is pressed into water storage bottles 6 and 11 and a water storage pipeline 8 of each stage cooling device by peristaltic pumps 3-1 and 3-2 and water supply is stopped, then the temperature of refrigerant in the corresponding device is reduced according to the target temperature of supercooled water in each stage cooling device, at this time, the temperature of supercooled water is also reduced under the influence of the ambient temperature, when the temperature control device 7 for monitoring the temperature of supercooled water in the cooling device reaches the target temperature, the peristaltic pump press out the supercooled water in the water storage device at the target required flow, at this time, the system carries out feedback through each stage supercooled water temperature control device 7, 7-3, 7-5, 7-7, if the target temperature is not reached, the temperature of refrigerant in each stage cooling device is further regulated through the temperature control device 7-1, 7-2, 7-4 and 7-6, so that the temperature of supercooled water at the output end of each stage cooling device reaches the target range, and finally the temperature and flow of supercooled water provided by the device reach the target value. Figure 5

[0042] Through specific actual experiments, under the single-path supercooled water supply system, the above device / method is operated with the temperature of 0.5 DEG C and the flow of 0.1 L / h of ultrapure water under the environment setting of different temperature refrigerants of each stage, and 0.1 L / h, -12 DEG C and 45 minutes of supercooled water can be stably supplied. According to different target temperatures, different stage number combination cooling schemes can be selected, as shown in the figure. Figure 7 When the application adopts the single-path supercooled water stable supply system, the temperature of supercooled water is -6 DEG C, the application only needs a two-stage cooling scheme, at this time, the flow of supercooled water supply is 0.2 L / h, which is calculated through the volume of supercooled water flowing out at the output end in unit time. The results show that the temperature of supercooled water in the initial stage exists a phenomenon of temperature rise, the temperature distribution 7-1 and 7-2 of the second stage refrigerant device is regulated based on the result feedback of the temperature control device 7-3, so that the final supercooled water supply temperature is basically stable near -6 DEG C, and the temperature fluctuation is within 0.6 DEG C. When the required temperature of supercooled water supply is -12.5 DEG C, the application needs a four-stage cooling scheme, the target temperature of the second stage cooling device is set to -6 DEG C + / - 0.5 DEG C, the target temperature of the third stage cooling device is -9 DEG C + / - 0.5 DEG C, and the target temperature of the fourth stage cooling device is -12.5 DEG C + / - 0.6 DEG C, at this time, the flow of supercooled water supply is 0.1 L / h, the temperature of supercooled water in the initial stage also exists a phenomenon of temperature rise, the temperature of each stage refrigerant 7-1, 7-2, 7-4 and 7-6 is regulated based on the result feedback of the temperature control device 7-3, 7-5 and 7-7, so that the final supercooled water supply temperature is basically stable, and the temperature fluctuation of supercooled water is within 1 DEG C. The two-way parallel supercooled water stable supply system can be used to realize that supercooled water is started in another way when one way is blocked, so that the stable supply time of supercooled water is doubled (90 minutes), as shown in the figure. Figure 6 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℃.

[0043] Compared with the prior art, the device can realize continuous supply of supercooled water at a lower temperature through the multi-stage cooling device, and can not only increase the flow of supercooled water supply through the multi-path parallel mode, but also avoid ice blockage caused by supercooled water icing to affect the supply of supercooled water. The method and device provided by the application can be operated in normal temperature and low temperature environments, stably supply supercooled water, and have wide application range.

[0044] The above specific embodiments can be adjusted in different ways by those skilled in the art without departing from the principles and purposes of the application, the protection scope of the application is subject to the claims and is not limited by the above specific embodiments, and each implementation scheme within the scope is subject to the constraints of the application.

Claims

1. A supercooled water stabilisation supply system characterised in that, The application relates to a water supply device, first to fourth stage multi-stage cooling devices and a supercooled water storage device arranged in the third stage cooling device, wherein the output ends of at least one of the cooling devices and the supercooled water storage device are provided with temperature control devices; normal temperature water enters the first to fourth stage cooling devices arranged in different temperature cooling environments under the pressure of the water supply device and is gradually reduced to a target temperature; the temperature control devices monitor and feedback the target temperature difference of the supercooled water in the water storage device, and then regulate the temperature of the cooling environment, so that the required flow and temperature supercooled water are stably supplied. The second stage cooling device comprises at least one cavity filled with a first cooling medium and a spiral pipeline arranged in the cavity, wherein the cavity is externally provided with a heating film and a temperature control device to form a gradient temperature environment; the inlet height of the spiral pipeline in the first cooling medium is higher than the outlet height, so that the temperature of the supercooled water is reduced from 0 DEG C at the inlet to a first target temperature and then output. The third stage cooling device is filled with a second cooling medium, wherein the supercooled water storage device is immersed in the second cooling medium, and the temperature of the supercooled water is reduced to a second target temperature in the low-temperature cooling medium environment. The gradient temperature environment refers to Wherein, the temperature decreasing rate of the stable overcooled water is calculated based on H is the height of the second cooling device, v cooling is the temperature decreasing rate of the overcooled water, R is the radius of the spiral pipe, L is the length of the spiral pipe, and Q is the flow of the overcooled water in the spiral pipe.

2. The supercooled water stabilizing supply system according to claim 1, characterized by, The fourth stage cooling device is a container with a cooling cavity, wherein the cooling cavity and the container are filled with a third cooling medium, the temperature of the supercooled water is reduced in the low-temperature cooling medium environment of the cooling cavity through air convection heat exchange, and the temperature of the supercooled water is reduced to a third target temperature in the low-temperature cooling medium environment.

3. The supercooled water stabilizing supply system according to claim 1, characterized by, The first stage cooling device adopts a refrigerator to cool the water in the water storage device to 0-0.5 DEG C, and the output end temperature T0 is monitored through a temperature control device.

4. The supercooled water stabilizing supply system according to claim 1, characterized by, The multi-stage cooling device adopts a gradient temperature environment cooling method, a cooling medium immersion cooling method and a cooling medium air heat convection cooling method, and different stages and cooling method combination cooling schemes can be selected according to different target temperatures.

5. The supercooled water stabilizing supply system according to claim 1, characterized by, The at least one refers to a plurality of parallel second stage cooling devices, a plurality of parallel supercooled water storage devices arranged in the third stage cooling device and a fourth stage cooling device with parallel pipelines.

6. The supercooled water stabilizing supply system according to claim 1, characterized by, The application relates to a water supply device, first to fourth stage multi-stage cooling devices and a supercooled water storage device arranged in the third stage cooling device, wherein the output ends of at least one of the cooling devices and the supercooled water storage device are provided with temperature control devices; normal temperature water enters the first to fourth stage cooling devices arranged in different temperature cooling environments under the pressure of the water supply device and is gradually reduced to a target temperature; the temperature control devices monitor and feedback the target temperature difference of the supercooled water in the water storage device, and then regulate the temperature of the cooling environment, so that the required flow and temperature supercooled water are stably supplied.

7. The temperature control method of any one of claims 1-6, wherein, Step 1: the water above 0 DEG C at the inlet is gradually cooled to a first target temperature of the measured outlet temperature through a second stage gradient temperature distribution; ​ 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 temperature gradient in the device is regulated by controlling the output power P of the heating film, so that the supercooled water reaches the first target temperature of the measured outlet temperature ; said first target temperature wherein: T0 is the temperature at the inlet of the second stage cooling device (9), the temperature of the first coolant η is the coolant temperature efficiency value, the output power of the heating film C re is the specific heat capacity of the coolant, p re is the density of the coolant, Q re is the flow rate of the coolant; Step 2, the supercooled water is cooled to the second target temperature T2 under the influence of the second refrigerant of the third stage cooling device; when the measured result of 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 measured outlet temperature of the temperature control device, and the temperature of the second refrigerant η is the refrigerant temperature efficiency value; Step 3, the subcooled water is cooled to the third target temperature T3 under the influence of the third refrigerant of the fourth cooling device; when the measured result of the temperature control device does not reach the second target temperature, the temperature of the temperature control device is changed so that the subcooled water reaches the third target temperature of the outlet temperature measured by the temperature control device, and the temperature of the third refrigerant η is the refrigerant temperature efficiency value; at this time, the subcooled water temperature reaches the target temperature, and the system can provide subcooled water with a certain flow and temperature through the water supply device.

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