A constant temperature cooling water system for cold capacity compensation of heavy ion accelerator

Abstract

The present invention relates to a constant-temperature cooling water system for cold capacity compensation of a heavy ion accelerator, comprising: deionized water passing through various systems of the accelerator enters an open water tank; the deionized water flowing out of the open water tank enters a first heat exchanger; a portion of the deionized water flowing out of the first heat exchanger enters a first cooling tower; the remaining portion enters a first water distributor after temperature and pressure testing; the deionized water flowing out of the first cooling tower enters a second heat exchanger; the deionized water flowing out of the second heat exchanger enters a chiller for cooling; the deionized water passing through the chiller passes through a second water distributor, a second heat exchanger, and a first heat exchanger in sequence before entering the first water distributor. The system, based on various physical experiments, such as the power and heat generation of various systems in an ion accelerator, diurnal and seasonal variations, and the cooling effect of the cooling tower, modifies the current cooling water system of a heavy ion accelerator to address the issues of cold capacity and control accuracy of the cooling water system of the heavy ion accelerator.

Description

Technical Field

[0001] The invention relates to a constant temperature cooling water system for cold capacity compensation of a heavy ion accelerator, belonging to the technical field of cooling for accelerators. Background Art

[0002] Heavy ion accelerators are devices that accelerate heavy ions, capable of accelerating a wide range of charged particles, from protons to uranium ions. They are crucial research platforms for heavy ion physics and its interdisciplinary fields. The precise physics experiments conducted at these experimental terminals place high demands on the stability of experimental conditions.

[0003] As an important subsystem among the systems of the heavy ion accelerator, the cooling water system plays a very important role in the stable and reliable operation of the heavy ion accelerator device. Since the main heating components of the heavy ion accelerator will generate heat during operation, and this heat needs to be carried away by circulating cooling water, the constant water temperature of the heavy ion accelerator cooling water is an important condition for the stable operation of various accelerator equipment. When conducting physical experiments on the heavy ion accelerator device, changes in the cooling water temperature will affect the stability of the ion beam of the accelerator device, and the beam quality required for precision physical experiments will not be achieved, thus affecting the results of the physical experiments. Since different physical experiments require different ion types and energies, the heat generated by the equipment of the heavy ion accelerator device is also significantly different, so the required cooling capacity is also different. Referring to the different cooling capacities of the cooling tower during the day and night and the seasons, the temperature of the cooling water also varies significantly.

[0004] The existing heavy ion accelerator cooling water system uses an open cooling tower to cool secondary softened water, which then passes through a plate heat exchanger and exchanges heat with primary deionized water. After the primary deionized water cools down, it enters a buffer water tank. A circulating water pump then delivers the primary deionized water in the tank to various equipment in the heavy ion accelerator to cool the equipment. The main problems with the current technology are as follows:

[0005] Due to seasonal variations in ambient temperature and humidity, the cooling capacity of open cooling towers varies. Therefore, in summer, they struggle to meet the cooling requirements of the heavy ion accelerator, resulting in excessively high cooling water temperatures. In winter, the ambient temperature is too low, and the outlet water temperature from the open cooling towers is too low, causing the temperature of the heavy ion accelerator's primary deionized water to drop significantly below summer levels. This makes the heavy ion accelerator's cooling water inconsistent, making it impossible to meet the precise physics experiments required at the experimental terminal.

[0006] The existing open cooling tower only uses a simple fan switch control, which cannot effectively eliminate the peak value of cooling water temperature caused by seasonal and diurnal environmental changes, resulting in large changes in the temperature of the first deionized water.

[0007] The heavy ion accelerator facility consists of various accelerators, including a cyclotron, a large separation fan cyclotron, the Lanzhou radioactive beam line, a cooling storage ring, and a linear accelerator. During operation, the uncertain operating status of the various accelerators, coupled with changes in external weather, causes significant fluctuations in total heat generation. This results in significant temperature variations in the first deionized water.

[0008] Because the water cooling system of the heavy ion accelerator is relatively large and mainly uses room temperature magnets, the requirement for constant cooling water temperature was not considered during the construction process, making the current processes and control methods difficult to apply. Summary of the Invention

[0009] In response to the above problems, the purpose of the present invention is to provide a constant temperature cooling water system for heavy ion accelerator cold capacity compensation. It refers to different physical experiments, such as the power and heat generation of each system of the ion accelerator equipment, day and night seasonal changes, and the cooling effect of the cooling tower, etc., to modify the current heavy ion accelerator cooling water system to solve the problems of cold capacity and control accuracy of the heavy ion accelerator cooling water system.

[0010] To achieve the above-mentioned objectives, the present invention proposes the following technical solutions: a constant temperature cooling water system for cold capacity compensation of a heavy ion accelerator, comprising: a first water distributor, an open water tank, a first heat exchanger, a first cooling tower, a second heat exchanger, a chiller and a second water distributor; deionized water passing through various systems of the accelerator enters the open water tank, part of the deionized water flowing out of the open water tank enters the first heat exchanger, and the other part enters the first water distributor after temperature and pressure detection; part of the water flowing out of the first cooling tower enters the second heat exchanger and the first heat exchanger, and the other part of the water flowing out of the first cooling tower directly enters the first heat exchanger; the deionized water flowing out of the second heat exchanger enters the chiller for cooling; the deionized water passing through the chiller passes through the second water distributor and the second heat exchanger in sequence.

[0011] Furthermore, the constant temperature cooling water system also includes a primary circulating water pump and a polishing mixed bed; the primary circulating water pump and the polishing mixed bed are arranged between the open water tank and the first heat exchanger, and the deionized water flowing out of the open water tank enters the polishing mixed bed through the primary circulating water pump, and the deionized water passing through the polishing mixed bed flows back to the open water tank.

[0012] Furthermore, the open water tank is connected to a water replenishing device for replenishing water to the open water tank, and a drop-in liquid level gauge is provided in the open water tank for detecting the liquid level of the open water tank.

[0013] Furthermore, a diverter three-way regulating valve is arranged between the primary circulating water pump and the first heat exchanger; the first interface of the diverter three-way regulating valve is connected to the primary circulating water pump, the second interface is connected to the first heat exchanger, and the third interface is connected to the pipeline between the first heat exchanger and the first water distributor through a pipeline.

[0014] Furthermore, a first temperature sensor and a first pressure sensor are provided between the first heat exchanger and the first water separator, near the inlet of the first water separator; and a second temperature sensor and a second pressure sensor are provided between the second heat exchanger and the first heat exchanger, near the inlet of the first heat exchanger.

[0015] Furthermore, an external water pool is provided at the output end of the first cooling tower, and the deionized water flowing out of the first cooling tower enters the external water pool; a closed water tank is provided at the output end of the chiller, and the deionized water passing through the chiller enters the closed water tank, and the closed water tank is replenished with deionized water through a water replenishment and constant pressure device.

[0016] Furthermore, a secondary circulation water pump is provided between the external water tank and the second heat exchanger, a chilled water pump is provided between the closed water tank and the second water distributor, and a variable frequency controlled pump is provided between the second heat exchanger and the first heat exchanger.

[0017] Furthermore, for the first temperature sensor, the temperature control target is set to 21-23°C, which is achieved by controlling the diversion three-way regulating valve through the PID controller; for the second temperature sensor, when the temperature value rises to the preset value, the target setting value of the second temperature sensor is achieved by starting the PID controller to adjust the frequency of the variable frequency control pump to maintain the actual outlet water temperature between 17.5°C and 19°C.

[0018] Furthermore, the chiller includes a deionized water pipeline and a coolant circulation pipeline, the coolant circulation pipeline includes a second cooling tower and a cooling water pump, the deionized water pipeline is introduced into the deionized water to be cooled, and flows into the pipeline in the chiller parallel to the ionized water pipeline with the cooling water pump, and performs heat exchange with the ionized water pipeline.

[0019] Furthermore, the deionized water passing through each system of the accelerator enters the open water tank through the first water collector, and the deionized water flowing out of the second heat exchanger enters the chiller through the second water collector.

[0020] The technical solution of the present invention has at least the following technical effects or advantages:

[0021] 1. This invention uses a three-way flow-dividing valve to precisely regulate the temperature of the deionized water entering the first water distributor. When the cooling capacity of the first cooling tower is insufficient, the chiller's cooling capacity is transferred through the second heat exchanger to further reduce the temperature of the water outside the first heat exchanger. This cooling capacity compensation effectively meets the cooling requirements of different seasons and physical experiments, achieving stable deionized water temperature regulation.

[0022] 2. A variable frequency controlled pump is installed after the second heat exchanger to dynamically adjust the cooling capacity required for constant temperature water, thus achieving energy saving.

[0023] 3. The present invention refers to different physical experiments, such as the power and heat generation of each system of the ion accelerator, day and night seasonal changes, and the cooling effect of the cooling tower, to modify the current cooling water system of the heavy ion accelerator to solve the problems of temperature control accuracy and stability of the cooling water system of the heavy ion accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 Schematic diagram of a constant temperature cooling water system for cold capacity compensation of a heavy ion accelerator in one embodiment of the present invention.

[0025] Reference numerals:

[0026] 1-First water distributor; 2-Open water tank; 3-First heat exchanger; 4-First cooling tower; 5-Second heat exchanger; 6-Chiller; 7-Second water distributor; 8-Primary circulation water pump; 9-Polishing mixed bed; 10-Water replenishment device; 11-Submersible level gauge; 12-Diverter three-way regulating valve; 13-First temperature sensor; 14-First pressure sensor; 15-Second temperature sensor; 16-Second pressure sensor; 17-External water tank; 18-Closed water tank; 19-Water replenishment constant pressure device; 20-Secondary circulation water pump; 21-Chilled water pump; 22-Voltage control pump; 23-Deionized water pipeline; 24-Coolant circulation pipeline; 25-Second cooling tower; 26-Cooling water pump; 27-First water collector; 28-Second water collector. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the present invention will be described in detail through specific embodiments. However, it should be understood that the specific embodiments are provided only for a better understanding of the present invention and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms used are for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In order to solve the problems existing in the prior art, such as the uncertainty of the startup status of various accelerators during operation and the change of external weather, which causes the total heat output to vary greatly and the temperature of the first deionized water to vary greatly, the present invention proposes a constant temperature cooling water system for heavy ion accelerator cold compensation, wherein the first heat exchanger 3 and the first cooling tower 4 circulating water circuit exchange heat. After the first cooling tower 4 circulating water circuit exchanges heat with the first cooling tower 4 and cools down for the first time, if the water temperature of the first cooling tower 4 does not meet the cooling requirement, it can exchange heat with the second heat exchanger 5 again for cooling. Finally, the water temperature in the water circuit of the second cooling tower 25 reaches the cooling requirement of the first deionized water circuit. A three-way regulating valve is installed in the deionized water circulating water circuit to accurately adjust the temperature of the first deionized water circulating water and achieve the purpose of constant temperature. Below, in conjunction with the accompanying drawings, the present invention is described in detail by way of embodiment.

[0029] Example

[0030] This embodiment provides a constant temperature cooling water system for cold compensation of a heavy ion accelerator, such as Figure 1 As shown, the system includes: a first water distributor 1, an open water tank 2, a first heat exchanger 3, a first cooling tower 4, a second heat exchanger 5, a chiller 6, and a second water distributor 7. Deionized water passing through each accelerator system enters the open water tank 2. The deionized water flowing out of the open water tank 2 enters the first heat exchanger 3. Part of the deionized water flowing out of the first heat exchanger 3 enters the first cooling tower 4, and the remaining part enters the first water distributor 1 after temperature and pressure testing. The deionized water flowing out of the first cooling tower 4 enters the second heat exchanger. The deionized water flowing out of the second heat exchanger enters the chiller 6 for cooling. The deionized water passing through the chiller 6 passes through the second water distributor 7, the second heat exchanger 5, and the first heat exchanger 3 in sequence before entering the first water distributor 1. The first heat exchanger 3 and the first cooling tower 4 circulating water circuit exchange heat. After the first cooling tower 4 heat exchange and cooling, the circulating water circuit of the first cooling tower 4 achieves its initial cooling. During spring and autumn, the ambient temperature fluctuates significantly, and the heavy ion accelerator generates a large amount of heat. First cooling tower 4 cannot meet the load heat exchange requirements of the heavy ion accelerator. The water temperature in first cooling tower 4 does not meet the required cooling temperature. This requires further heat exchange with second heat exchanger 5, which then initiates cooling compensation by chiller 6 to maintain the constant temperature of the first deionized water supply. Ultimately, the water temperature in the water circuit of second cooling tower 25 meets the cooling requirements of the first deionized water circuit. A three-way regulating valve is installed in the deionized water circulation circuit to precisely adjust the temperature of the first deionized water circulation circuit to achieve a constant temperature.

[0031] In this embodiment, the first cooling tower 4 and the second cooling tower 25 are open cooling towers, and open cooling is achieved by the open cooling towers.

[0032] The constant-temperature cooling water system also includes a primary circulating water pump 8 and a polishing mixed bed 9. These are positioned between the open water tank 2 and the first heat exchanger 3. Deionized water flowing from the open water tank 2 enters the polishing mixed bed 9 through the primary circulating water pump 8. After passing through the polishing mixed bed 9, the deionized water flows back into the open water tank 2. In this embodiment, the polishing mixed bed 9 is a limited polishing mixed bed 9 designed to increase the conductivity of the deionized water.

[0033] The open water tank 2 is connected to a water replenishing device 10 for replenishing the open water tank 2. The water replenishing device 10 is designed for irregular replenishment of the first deionized water circulation circuit. A drop-in level gauge 11 is provided in the open water tank 2 for detecting the liquid level of the open water tank 2.

[0034] A diverter-type three-way regulating valve 12 is disposed between the primary circulating water pump 8 and the first heat exchanger 3. The first interface of the diverter-type three-way regulating valve 12 is connected to the primary circulating water pump 8, the second interface is connected to the first heat exchanger 3, and the third interface is connected to the pipeline between the first heat exchanger 3 and the first water distributor 1 via a pipeline. That is, the third interface of the diverter-type three-way regulating valve 12 is connected to the water outlet of the first heat exchanger 3 via a pipeline. A first temperature sensor 13 and a first pressure sensor 14 are disposed at a monitoring point on the pipeline between the first heat exchanger 3 and the first water distributor 1, near the inlet of the first water distributor 1, i.e., at the water inlet of the first water distributor 1. The first temperature sensor 13 and the first pressure sensor 14 are disposed between the pipeline connecting the third interface of the diverter-type three-way regulating valve 12 and the first water distributor 1.

[0035] A second temperature sensor 15 and a second pressure sensor 16 are provided between the second heat exchanger 5 and the first heat exchanger 3 , near the inlet of the first heat exchanger 3 .

[0036] An external water reservoir 17 is provided at the output end of the first cooling tower 4 to increase the system's buffering capacity. Deionized water flowing out of the first cooling tower 4 enters the external water reservoir 17. A closed water tank 18 is provided at the output end of the chiller 6. Deionized water passing through the chiller 6 enters the closed water tank 18. This closed water tank 18 is replenished with deionized water via a water replenishment and constant pressure device 19. This device ensures the normal and stable operation of the chiller 6.

[0037] A secondary circulation water pump 20 is provided between the external water tank 17 and the second heat exchanger 5 , a chilled water pump 21 is provided between the closed water tank 18 and the second water distributor 7 , and a variable frequency controlled pump 22 is provided between the second heat exchanger 5 and the first heat exchanger 3 .

[0038] For the first temperature sensor 13, the temperature control target is set to 21-23°C, preferably 22°C in this embodiment. The PID controller controls the diversion three-way regulating valve 12 to adjust and distribute the flow rate proportional heat exchange to achieve the purpose of constant temperature; the pressure value detected by the first pressure sensor 14 is basically stable at 5 bar.

[0039] Regarding the second temperature sensor 15, if its temperature is between 17.5°C and 19°C and the cooling capacity of the first cooling tower 4 cannot meet the cooling requirements, causing the temperature of the second temperature sensor 15 to rise to 18°C, the PID controller is activated to adjust the frequency of the variable frequency control pump 22, initiating the cooling capacity compensation mode of the chiller 6 to achieve the target setpoint of the second temperature sensor 15 and maintain the actual outlet water temperature between 17.5°C and 19°C. During operation, the temperature detected by the second temperature sensor 15 is required to remain below 19°C, and the pressure value of the second pressure sensor 16 is required to maintain the control target of 4 bar.

[0040] Chiller 6 includes a deionized water line 23 and a coolant circulation line 24. Deionized water is fed into deionized water to be cooled. Coolant circulation line 24, which is used to cool the cooling water, includes a second cooling tower 25 and a cooling water pump 26. After heat exchange with the deionized water, the coolant passes through second cooling tower 25 for cooling. It then flows through cooling water pump 26 into a line within the chiller parallel to deionized water line 23, exchanging heat with the deionized water line 23. The cooling water flows through coolant circulation line 24 of chiller 6 and releases heat from chiller 6 to the atmosphere via second cooling tower 25. During operation, the temperature of second cooling tower 25 is required to be between 24°C and 32°C.

[0041] The outlet water temperature of chiller 6 is between 7°C and 12°C. When the heavy ion accelerator is running at high power and first cooling tower 4 cannot meet the cooling demand, second heat exchanger 5 continues to cool the water in the circulating water circuit of first cooling tower 4. The heat in chiller 6 is transferred to the atmosphere through second cooling tower 25.

[0042] The deionized water passing through each system of the accelerator enters the open water tank 2 through the first water collector 27 , and the deionized water flowing out of the second heat exchanger 5 enters the chiller 6 through the second water collector 28 .

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the specific embodiments of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be included within the scope of protection of the claims of the present invention. The above content is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art who can easily think of changes or replacements within the technical scope disclosed by the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. A constant temperature cooling water system for cold compensation of heavy ion accelerator, characterized in that: include: a first water distributor, an open water tank, a first heat exchanger, a first cooling tower, a second heat exchanger, a chiller, and a second water distributor; The deionized water passing through each system of the accelerator enters the open water tank, the deionized water flowing out of the open water tank enters the first heat exchanger, part of the deionized water flowing out of the first heat exchanger enters the first cooling tower, and the other part enters the first water distributor after temperature and pressure detection, the deionized water flowing out of the first cooling tower enters the second heat exchanger, the deionized water flowing out of the second heat exchanger enters the chiller for cooling, the deionized water passing through the chiller passes through the second water distributor, the second heat exchanger and the first heat exchanger in turn, and enters the first water distributor; the constant temperature cooling water system also includes a primary circulating water pump and a polishing mixed bed; the primary circulating water pump and the polishing mixed bed are arranged between the open water tank and the first heat exchanger, the deionized water flowing out of the open water tank enters the polishing mixed bed through the primary circulating water pump, and the deionized water passing through the polishing mixed bed flows back to the open water tank.

2. A constant temperature cooling water system for cold compensation of a heavy ion accelerator according to claim 1, characterized in that: The open water tank is connected to a water replenishing device for replenishing water to the open water tank. A drop-in liquid level gauge is provided in the open water tank for detecting the liquid level of the open water tank.

3. The constant temperature cooling water system for cold compensation of heavy ion accelerator according to claim 2 is characterized in that: A diverter three-way regulating valve is arranged between the primary circulating water pump and the first heat exchanger; the first interface of the diverter three-way regulating valve is connected to the primary circulating water pump, the second interface is connected to the first heat exchanger, and the third interface is connected to the pipeline between the first heat exchanger and the first water distributor through a pipeline.

4. A constant temperature cooling water system for cold compensation of a heavy ion accelerator according to claim 3, characterized in that: A first temperature sensor and a first pressure sensor are provided between the first heat exchanger and the first water separator, near the inlet of the first water separator; a second temperature sensor and a second pressure sensor are provided between the second heat exchanger and the first heat exchanger, near the inlet of the first heat exchanger.

5. The constant temperature cooling water system for cold compensation of heavy ion accelerator according to claim 4, characterized in that: An external water pool is provided at the output end of the first cooling tower, and the deionized water flowing out of the first cooling tower enters the external water pool; a closed water tank is provided at the output end of the chiller, and the deionized water passing through the chiller enters the closed water tank, and the closed water tank is replenished with deionized water through a water replenishment and constant pressure device.

6. The constant temperature cooling water system for cold compensation of heavy ion accelerator according to claim 5, characterized in that: A secondary circulation water pump is provided between the external water tank and the second heat exchanger, a chilled water pump is provided between the closed water tank and the second water distributor, and a variable frequency controlled pump is provided between the second heat exchanger and the first heat exchanger.

7. A constant temperature cooling water system for cold compensation of a heavy ion accelerator according to claim 6, characterized in that: For the first temperature sensor, the temperature control target is set to 21-23°C, which is achieved by controlling the diversion three-way regulating valve through the PID controller; for the second temperature sensor, when the temperature value rises to the preset value, the target setting value of the second temperature sensor is achieved by starting the PID controller to adjust the frequency of the variable frequency control pump to maintain the actual water outlet temperature between 17.5°C and 19°C.

8. The constant temperature cooling water system for cold compensation of heavy ion accelerator according to claim 7, characterized in that: The chiller includes a deionized water pipeline and a coolant circulation pipeline. The deionized water pipeline is fed with deionized water to be cooled. The coolant circulation pipeline includes a second cooling tower and a cooling water pump. The coolant after heat exchange with the deionized water is cooled by the second cooling tower and flows into the pipeline in the chiller parallel to the deionized water pipeline through the cooling water pump to exchange heat with the deionized water pipeline.

9. The constant temperature cooling water system for cold compensation of heavy ion accelerator according to claim 8, characterized in that: The deionized water passing through each system of the accelerator enters the open water tank through the first water collector, and the deionized water flowing out of the second heat exchanger enters the chiller through the second water collector.

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