Constant-temperature cooling water system for cooling capacity compensation of heavy ion accelerator

Abstract

The invention relates to a heavy ion accelerator cooling capacity compensation constant-temperature cooling water system which is characterized in that deionized water passing through all systems of an accelerator enters an open type water tank, the deionized water flowing out of the open type water tank enters a first heat exchanger, and part of the deionized water flowing out of the first heat exchanger enters a first cooling tower; 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 water chilling unit to be cooled, and the deionized water passing through the water chilling unit sequentially passes through the second water separator, the second heat exchanger and the first heat exchanger; and the water enters a first water segregator. The cooling water system of the current heavy ion accelerator is transformed by referring to different physical experiments, such as the power, the heating value and the day and night season change of equipment of each system of the ion accelerator, the cooling effect of a cooling tower and the like, so that the problems of the cooling capacity and the control precision of the cooling water system of the heavy ion accelerator are solved.

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. They can accelerate various charged particles from protons to uranium ions and are important scientific research platforms for heavy ion physics and its interdisciplinary subjects. The precise physical experiments on the experimental terminal place high demands on the stability of the experimental conditions.

[0003] As an important subsystem of the heavy ion accelerator systems, 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 taken 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 doing 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 by the precision physical experiments will not be achieved, thus affecting the results of the physical experiments. Due to the different types and energies of ions required for different physical experiments, the equipment heat generation 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 changes significantly.

[0004] The existing heavy ion accelerator cooling water system uses an open cooling tower to cool the secondary softened water, which then passes through a plate heat exchanger and primary deionized water for heat exchange. The primary deionized water enters the buffer water tank after its temperature is reduced. The circulating water pump delivers the primary deionized water in the water tank to various devices in the heavy ion accelerator device to cool the equipment. The main problems of the current technology are as follows: In different seasons, due to differences in ambient temperature and humidity, the cooling capacity of open cooling towers is also different. Therefore, in summer, it is difficult for open cooling towers to meet the cooling requirements of heavy ion accelerators, resulting in too high cooling water temperature. In winter, the ambient temperature is too low, and the outlet water temperature of the open cooling tower is too low, making the temperature of the primary deionized water of the heavy ion accelerator much lower than in summer. The open cooling tower makes it impossible to keep the cooling water of the heavy ion accelerator constant, and it is also impossible to meet the requirements of precise physical experiments on the experimental terminal.

[0005] 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 a large change in the temperature of the first deionized water. The heavy ion accelerator device consists of various accelerators such as cyclotron, large separation fan cyclotron, Lanzhou radioactive beam line, cooling storage ring, linear accelerator, etc. During operation, the uncertain startup status of various accelerators and the changes in external weather cause a large change in the total heat output, which leads to a large change in the temperature of the first deionized water.

[0006] Because the water cooling system of the heavy ion accelerator is relatively large and mainly uses room temperature magnets, the requirement for constant temperature of cooling water was not considered during the construction process, making existing processes and control methods difficult to apply. Summary of the invention In view of 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 modifies the current cooling water system of heavy ion accelerator with reference to different physical experiments, such as the power and heat generation of each system of ion accelerator, day and night seasonal changes, and the cooling effect of cooling tower, so as to solve the problems of cold capacity and control accuracy of the cooling water system of heavy ion accelerator.

[0007] To achieve the above-mentioned purpose, the present invention proposes the following technical scheme: 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, a 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; a 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.

[0008] Furthermore, the constant temperature cooling water system also includes a primary circulation water pump and a polishing mixed bed; the primary circulation 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 circulation water pump, and the deionized water passing through the polishing mixed bed flows back to the open water tank.

[0009] Furthermore, the open water tank is connected to a water replenishing device for replenishing water to the open water tank, and a immersion level meter is arranged in the open water tank for detecting the liquid level of the open water tank.

[0010] Furthermore, a diverter-type three-way regulating valve is arranged between the primary circulation water pump and the first heat exchanger; the first interface of the diverter-type three-way regulating valve is connected to the primary circulation 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.

[0011] 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.

[0012] 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.

[0013] Furthermore, a secondary circulation water pump is arranged between the external water tank and the second heat exchanger, a chilled water pump is arranged between the closed water tank and the second water distributor, and a variable frequency controlled pump is arranged between the second heat exchanger and the first heat exchanger.

[0014] 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.

[0015] 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 a pipeline in the chiller parallel to the deionized water pipeline with the cooling water pump, and performs heat exchange with the deionized water pipeline.

[0016] 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.

[0017] The technical solution of the present invention has at least the following technical effects or advantages: 1. The present invention uses a diverter three-way valve to accurately adjust the temperature of the deionized water entering the first water distributor. When the cooling capacity of the first cooling tower is insufficient, the cooling capacity of the chiller can be passed through the second heat exchanger to continue to reduce the external water temperature of the first heat exchanger. Through the compensation of cooling capacity, the cooling capacity requirements in different seasons and different physical experiments are effectively met, and the stability of the deionized water temperature regulation is achieved.

[0018] 2. By setting a variable frequency control pump after the second heat exchanger, the cooling capacity required for constant temperature water can be dynamically adjusted to achieve energy saving.

[0019] 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, and transforms the cooling water system of the current heavy ion accelerator to solve the problem of temperature control accuracy and stability of the cooling water system of the heavy ion accelerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of a constant temperature cooling water system for cold compensation of a heavy ion accelerator in one embodiment of the present invention.

[0021] Reference numerals: 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-immersion level gauge; 12-dividing 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-frequency control pump; 23-deionized water pipeline; 24-cooling liquid circulation pipeline; 25-second cooling tower; 26-cooling water pump; 27-first water collector; 28-second water collector. DETAILED DESCRIPTION

[0022] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is described in detail through specific embodiments. However, it should be understood that the provision of specific embodiments is only for a better understanding of the present invention, and they should not be understood as limitations of the present invention. In the description of the present invention, it should be understood that the terms used are only for the purpose of description and cannot be understood as indicating or implying relative importance.

[0023] In order to solve the problems existing in the prior art that the startup states of various accelerators are uncertain during operation, and the changes in the external weather cause the total heat output to vary greatly, resulting in a large change in the temperature of the first deionized water, etc., the present invention proposes a constant temperature cooling water system for cold compensation of a heavy ion accelerator, wherein the first heat exchanger 3 and the first cooling tower 4 circulating water circuit exchange heat, and the first cooling tower 4 circulating water circuit, after heat exchange and cooling with the first cooling tower 4, realizes the first cooling, if the water temperature of the first cooling tower 4 does not meet the cooling requirement, it can exchange heat and cool again with the second heat exchanger 5. Finally, the water temperature in the water circuit of the second cooling tower 25 meets 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 to achieve the purpose of constant temperature. Below, in conjunction with the accompanying drawings, the scheme of the present invention is described in detail through embodiments.

[0024] Example This embodiment provides a constant temperature cooling water system for cold compensation of a heavy ion accelerator, such as Figure 1 As shown, it 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; the deionized water passing through each system of the accelerator enters the open water tank 2, the deionized water flowing out of the open water tank 2 enters the first heat exchanger 3, a part of the deionized water flowing out of the first heat exchanger 3 enters the first cooling tower 4, and the other part enters the first water distributor 1 after temperature and pressure detection, 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, and 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, and enters the first water distributor 1. The first heat exchanger 3 and the first cooling tower 4 circulating water circuit exchange heat, and the first cooling tower 4 circulating water circuit realizes the first cooling after heat exchange and cooling with the first cooling tower 4. In spring and autumn, the outside temperature changes greatly, the heavy ion accelerator generates a large amount of heat, and the first cooling tower 4 cannot meet the load heat exchange of the heavy ion accelerator. The water temperature of the first cooling tower 4 does not meet the cooling requirement, and can exchange heat with the second heat exchanger 5 again to cool down and start the cold capacity compensation of the chiller 6 to meet the conditions for the first deionized water to achieve constant temperature. Finally, the water temperature in the water circuit of the second cooling tower 25 meets the cooling requirement of the first deionized water circuit. A three-way regulating valve is installed in the deionized water circulation water circuit to accurately adjust the temperature of the first deionized water circulation water to achieve the purpose of constant temperature.

[0025] 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.

[0026] The constant temperature cooling water system further includes a primary circulation water pump 8 and a polishing mixed bed 9; the primary circulation water pump 8 and the polishing mixed bed 9 are arranged between the open water tank 2 and the first heat exchanger 3, and the deionized water flowing out of the open water tank 2 enters the polishing mixed bed 9 through the primary circulation water pump 8, and the deionized water passing through the polishing mixed bed 9 flows back to the open water tank 2. In this embodiment, the polishing mixed bed 9 is a limited polishing mixed bed 9. The polishing mixed bed 9 is designed to improve the conductivity of deionized water.

[0027] 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 waterway. A drop-in liquid level meter 11 is provided in the open water tank 2 for detecting the liquid level of the open water tank 2.

[0028] A diverting three-way regulating valve 12 is arranged between the primary circulating water pump 8 and the first heat exchanger 3; the first interface of the diverting 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 through a pipeline, that is, the third interface of the diverting three-way regulating valve 12 is connected to the water outlet of the first heat exchanger 3 through a pipeline. A first temperature sensor 13 and a first pressure sensor 14 are arranged 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, that is, on the water inlet of the first water distributor 1. The first temperature sensor 13 and the first pressure sensor 14 are arranged between the third interface pipeline connecting the diverting three-way regulating valve 12 and the first water distributor 1.

[0029] 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 .

[0030] An external water pool 17 is provided at the output end of the first cooling tower 4, and the external water pool 17 is used to increase the buffering capacity of the system. The deionized water flowing out of the first cooling tower 4 enters the external water pool 17; a closed water tank 18 is provided at the output end of the chiller 6, and the deionized water passing through the chiller 6 enters the closed water tank 18, and the closed water tank 18 is supplemented with deionized water through the water replenishment constant pressure device 19. The water replenishment constant pressure device 19 is used to ensure the normal and stable operation of the chiller 6.

[0031] A secondary circulation water pump 20 is arranged between the external water tank 17 and the second heat exchanger 5 , a chilled water pump 21 is arranged between the closed water tank 18 and the second water distributor 7 , and a variable frequency controlled pump 22 is arranged between the second heat exchanger 5 and the first heat exchanger 3 .

[0032] For the first temperature sensor 13, the temperature control target is set to 21-23°C, preferably 22°C in this embodiment, and the diversion three-way regulating valve 12 is controlled by the PID controller to distribute the flow ratio 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.

[0033] For the second temperature sensor 15, the temperature of the second temperature sensor 15 is between 17.5°C and 19°C. If the cooling capacity of the first cooling tower 4 cannot meet the cooling requirements, and the temperature of the second temperature sensor 15 rises to 18°C, the PID controller is started to adjust the frequency of the variable frequency control pump 22, and the cooling capacity compensation mode of the chiller 6 is started to achieve the target setting value of the second temperature sensor 15 to 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 be kept below 19°C, and the pressure value of the second pressure sensor 16 is required to maintain the control target 4bar.

[0034] The chiller 6 includes a deionized water pipeline 23 and a coolant circulation pipeline 24. The deionized water pipeline 23 is fed with deionized water to be cooled. The coolant circulation pipeline 24 is used to cool the cooling water and includes a second cooling tower 25 and a cooling water pump 26. The coolant after heat exchange with the deionized water is cooled through the second cooling tower 25 and flows into the pipeline in the chiller parallel to the deionized water pipeline 23 through the cooling water pump 26 to exchange heat with the deionized water pipeline 23. The cooling water flows through the coolant circulation pipeline 24 of the chiller 6, and the heat in the chiller 6 is released into the atmosphere through the second cooling tower 25. The temperature of the second cooling tower 25 is required to be between 24°C and 32°C during operation.

[0035] The outlet water temperature of the chiller 6 is between 7°C and 12°C. When the heavy ion accelerator is running at high power, if the first cooling tower 4 cannot meet the cooling demand, the water in the circulating water circuit of the first cooling tower 4 is continuously cooled and heat exchanged through the second heat exchanger 5. The heat in the chiller 6 is exchanged to the atmosphere through the second cooling tower 25.

[0036] 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 .

[0037] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation of the present invention can still be modified or replaced by equivalents, and any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention should be included in the protection scope of the claims of the present invention. The above content is only a specific implementation of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or replacements within the technical scope disclosed by the present invention, which should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope 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, a 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 sequence, and enters the first water distributor; the constant temperature cooling water system also includes a primary circulation water pump and a polishing mixed bed; the primary circulation 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 circulation 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 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 immersion level meter is arranged 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-type three-way regulating valve is arranged between the primary circulation water pump and the first heat exchanger; the first interface of the diverter-type three-way regulating valve is connected to the primary circulation 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 heavy ion accelerator according to claim 3, characterized in that: A first temperature sensor and a first pressure sensor are arranged 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 arranged between the second heat exchanger and the first heat exchanger near the inlet of the first heat exchanger.

5. A constant temperature cooling water system for cold compensation of heavy ion accelerator according to claim 4, characterized in that: An external water pool is arranged 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 arranged 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 constant pressure device.

6. A 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 arranged between the external water tank and the second heat exchanger, a chilled water pump is arranged between the closed water tank and the second water distributor, and a variable frequency controlled pump is arranged between the second heat exchanger and the first heat exchanger.

7. A constant temperature cooling water system for cold compensation of 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. A constant temperature cooling water system for cold compensation of a 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 a pipeline in the chiller parallel to the deionized water pipeline through the cooling water pump to exchange heat with the deionized water pipeline.

9. A constant temperature cooling water system for cold compensation of a 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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