Water cooling system and water cooling method for boron neutron capture device

Abstract

The invention relates to a water cooling system and a water cooling method for a boron neutron capture device, and the water cooling system is divided into external circulation and internal circulation, so that cooling water in the internal circulation is in a relatively closed environment and only exchanges heat with corresponding equipment of an external circulation subsystem and the boron neutron capture device, additional impurities are prevented from being introduced, and the service life of the boron neutron capture device is prolonged. The conductivity of the cooling water is improved, and the phenomenon of electric conduction and even sparking occurs in a high-voltage environment of corresponding equipment of the boron neutron capture device; all parts in the internal circulation subsystem may generate impurities in the long-time use process, and the conductivity is affected, so that an internal circulation water supplementing device is arranged, deionized water is supplemented to a cooling pipeline, and the conductivity of cooling water is reduced; meanwhile, for the internal circulation subsystem applied to equipment with extremely high conductivity requirements, a deionizing device is further arranged, cooling water can be deionized under the condition that the flow of the internal circulation subsystem is not influenced, and the conductivity is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of radiotherapy, and in particular to a water cooling system and a water cooling method for a boron neutron capture device. Background Art

[0002] Boron neutron capture therapy (BNCT) is one of the most advanced cancer treatments in the world. During treatment, the patient is first injected with a boron-containing drug, which has a strong affinity for cancer cells and quickly accumulates in cancer cells, which is equivalent to "marking" cancer cells, while it is rarely distributed in other tissues. The patient is then irradiated with neutrons for less than 1 hour, and the entire treatment process generally requires only one irradiation. When the irradiated neutrons are captured by the boron in the cancer cells, highly lethal alpha particles and lithium ions are produced, which can accurately "kill" cancer cells.

[0003] The boron neutron capture therapy device mainly includes an ion source, an accelerator, a high-energy beam line, a target and a beam shaper; the function of the ion source is to generate ions by using electron bombardment to ionize gas molecules, ionize atoms on the solid surface, gas discharge ionization, Hettertz field ionization and other methods, and then lead the ions into a beam; the function of the accelerator is to accelerate the ion beam generated by the ion source; the function of the high-energy beam line is to amplify and focus the electron beam to make the beam uniform; the function of the target is to obtain neutrons by proton beam target shooting; the function of the beam shaper is to screen neutrons that can be used for treatment and eliminate unnecessary neutrons.

[0004] The above-mentioned ion sources, accelerators, beam transport lines, targets, beam shapers and other equipment will generate a large amount of heat during operation. A cooling system is required to efficiently cool these devices to avoid damage to the equipment caused by high temperature. A liquid cooling system is generally used.

[0005] However, the liquid cooling system of the prior art has defects and is not suitable for the various devices in the boron neutron capture therapy device. The specific reason is that the working environment of the various devices in the boron neutron capture therapy device is a high-pressure environment, and the cooling medium cannot have conductive properties. If the conductivity of the cooling medium is high, the cooling medium is prone to ignition in the high-pressure environment, thereby damaging the equipment and increasing the risk of equipment operation. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defects in the prior art, thereby providing a water cooling system and a water cooling method for a boron neutron capture device.

[0007] To achieve the above object, the present invention adopts the following technical solutions:

[0008] A boron neutron capture device water cooling system is applied to the boron neutron capture device, wherein the boron neutron capture device comprises a target, an ion source, an accelerator, a high-energy beam line and a power source;

[0009] The system includes an external circulation subsystem and a plurality of internal circulation subsystems.

[0010] The external circulation subsystem is used to provide a cold source for the internal circulation subsystem;

[0011] The internal circulation subsystem includes a cooling pipeline, a heat exchange device, an internal circulation pump, an internal temperature sensor, a pressure sensor, a conductivity sensor and an internal circulation water replenishment device. The cooling pipeline is connected to the heat exchange device and is used to perform heat exchange with the external circulation subsystem; the cooling pipeline also performs heat exchange with the corresponding equipment of the boron neutron capture device; the circulation pump, the internal temperature sensor and the conductivity sensor are arranged on the cooling pipeline, and the internal circulation water replenishment device is in communication with the cooling pipeline and is in communication connection with the conductivity sensor, and is used to replenish deionized water to the cooling pipeline when the conductivity in the cooling pipeline is higher than a first set value;

[0012] At least one of the internal circulation subsystems further includes a deionization device, which is disposed on the cooling pipeline and is used for deionizing cooling water in the cooling pipeline.

[0013] Preferably, the cooling pipeline is also connected to a drainage pipeline, and the pressure sensor is further used to detect the water pressure value in the cooling pipeline after detecting that the conductivity in the cooling pipeline is higher than the first set value and the drainage pipeline is opened for drainage, and control the closure of the drainage pipeline when the water pressure value reaches a low pressure value;

[0014] The internal circulation water replenishing device is used to open after the pressure sensor detects that the water pressure value reaches the low pressure value and closes the drainage pipeline, so as to replenish deionized water to the cooling pipeline.

[0015] Preferably, the internal circulation water replenishment device includes a water inlet pipeline, a water replenishment pipeline, a water storage tank, a filter and a deionizer, the water inlet pipeline is connected to the water storage tank, the filter and the deionizer are arranged on the water inlet pipeline, and the water storage tank is used to store deionized water; the water replenishment pipeline is connected to the cooling pipeline and the water storage tank.

[0016] Preferably, the plurality of internal circulation subsystems include a target cooling subsystem corresponding to the target, an ion source accelerator cooling subsystem corresponding to the ion source and the accelerator, a high energy beam line cooling subsystem corresponding to the high energy beam line, and a power source cooling subsystem corresponding to the power source, and the target cooling subsystem and the ion source accelerator cooling subsystem both include a deionization device; or,

[0017] The plurality of internal circulation subsystems include a first cooling subsystem corresponding to the target, ion source and accelerator, and a second cooling subsystem corresponding to the high energy beam line and power source, wherein the first cooling subsystem includes a deionization device; and / or

[0018] Each internal circulation subsystem has at least two internal circulation pumps, and the internal circulation pumps are provided with an automatic switching conduction module for conducting the cooling pipeline when one of the internal circulation pumps fails.

[0019] Preferably, the external circulation subsystem comprises a refrigerator, an external circulation pipeline, an external circulation pump, an external temperature sensor and a water storage device, and the refrigerator is connected to the water storage device and refrigerates;

[0020] The external circulation pipeline includes a main circuit and a plurality of branches, the main circuit connects the plurality of branches with the water storage device, and is used to return the heated water to the water storage device, the external temperature sensor is arranged on the main circuit, and the plurality of branches respectively exchange heat with the cooling pipelines of the plurality of internal circulation subsystems through a heat exchange device;

[0021] The external circulation pump is respectively arranged on the branch corresponding to each of the internal circulation subsystems, and is used to control the cooling amount based on the detection data of the external temperature device.

[0022] Preferably, the water storage device comprises a low temperature side and a high temperature side, the high temperature side is respectively connected to the main circuit and the refrigerator, and the low temperature side is respectively connected to the refrigerator and a plurality of the branches; the high temperature side is provided with a water inlet, a liquid level sensor and an overflow valve; and / or

[0023] There are at least two external circulation pumps on each branch line, and the external circulation pumps are provided with an automatic switching conduction module for conducting the branch line when one of the external circulation pumps fails.

[0024] Preferably, the particle size of the particles in the cooling water in the cooling pipeline is less than or equal to 100 μm; and / or

[0025] The dissolved oxygen content of the cooling water in the cooling pipeline is less than or equal to 200 ppm; and / or

[0026] The conductivity range of the cooling water in the cooling pipeline is: 0.5-1μs / cm.

[0027] To achieve the above purpose, the present invention also adopts the following technical solutions:

[0028] A method for water cooling a boron neutron capture device, using the above-mentioned boron neutron capture device water cooling system, comprises the following steps:

[0029] Start the external circulation subsystem to provide a cold source;

[0030] The inner circulation subsystem is started, the cooling pipeline exchanges heat with the outer circulation subsystem, the cooling pipeline exchanges heat with the corresponding equipment of the boron neutron capture device, and the conductivity, water temperature and water pressure in the cooling pipeline of each inner circulation subsystem are detected in real time;

[0031] If the conductivity is greater than or equal to the second set value, the deionization device is started, and if there is no deionization device, it is not started;

[0032] If the conductivity is greater than or equal to the first set value, the internal circulation water replenishment device is started; the second set value is less than the first set value;

[0033] If the water temperature is greater than the temperature setting value, the external circulation subsystem is controlled to increase the cooling capacity, and / or the internal circulation pump is controlled to increase the frequency;

[0034] If the water pressure is greater than the high pressure value, the frequency of the internal circulation pump is controlled to decrease, and / or the drainage pipeline is controlled to drain water.

[0035] Preferably, when the conductivity is greater than the first set value, the step of starting the internal circulation water replenishment device further includes:

[0036] If the conductivity is greater than the first set value and the duration is greater than the time threshold, then

[0037] Start drainage and detect the water pressure value in the cooling pipeline in real time. If the water pressure value reaches the low pressure value, stop drainage, start the internal circulation water replenishment device, open the water replenishment pipeline, and replenish deionized water to the cooling pipeline;

[0038] Then, when it is determined that the water pressure value is equal to the pressure setting value, the water supply pipeline is closed.

[0039] Preferably, starting the external circulation subsystem to provide a cold source comprises the following steps:

[0040] Start the refrigerator and the external circulation pump. The refrigerator cools the water in the water storage device and inputs it to the low-temperature side. The water exchanges heat with the heat exchange device of the corresponding internal circulation subsystem through several branches and then flows back to the main circuit. The return water temperature in the main circuit is detected in real time.

[0041] If the return water temperature is greater than the return water set value, increase the frequency of the external circulation pump and increase the cooling capacity until the return water temperature is lower than the return water set value; and / or

[0042] The starting of the external circulation subsystem to provide a cold source also includes the following steps:

[0043] There are multiple refrigerators, including a main refrigerator and a standby refrigerator, and each refrigerator is provided with a corresponding chilled water pump;

[0044] When starting the external circulation subsystem, start the refrigeration host and the corresponding ice water pump;

[0045] Based on the relationship between the outlet water temperature and the chilled water temperature setting value, the number of refrigeration standby units started up with loading or unloading and the number of corresponding chilled water pumps;

[0046] The priority of the standby refrigeration machine is based on the accumulated running time. The standby refrigeration machine with less accumulated running time and no faults is loaded first, and the standby refrigeration machine with longer accumulated running time is unloaded first.

[0047] Compared with the prior art, the present invention has the following beneficial effects:

[0048] The water cooling system of the boron neutron capture device provided in the above technical solution is divided into an external circulation and an internal circulation, so as to ensure that the cooling water in the internal circulation is in a relatively closed environment, and only has heat exchange with the external circulation subsystem and the corresponding equipment of the boron neutron capture device, so as to avoid the introduction of additional impurities, which will increase the conductivity of the cooling water and cause conductivity or even sparking in the high-pressure environment of the corresponding equipment of the boron neutron capture device; each component in the internal circulation subsystem may also produce impurities during long-term use, affecting the conductivity, therefore, an internal circulation water replenishment device is provided to replenish deionized water to the cooling pipeline and reduce the conductivity of the cooling water; at the same time, for the internal circulation subsystem used for equipment with extremely high conductivity requirements, a deionization device is also provided, which can deionize the cooling water and reduce the conductivity without affecting the flow of the internal circulation subsystem.

[0049] Based on the above-mentioned boron neutron capture device water cooling system, the present application also provides a water cooling method, which can automatically control the temperature reduction for different equipment and their corresponding internal circulation subsystems, and meet the conductivity requirements of each equipment to ensure the safe use of the boron neutron capture device. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0051] Figure 1 Schematic diagram of the framework of the water cooling system according to an embodiment of the present invention.

[0052] Description of reference numerals:

[0053] 1. Target; 2. Accelerator; 3. High-energy beam line; 4. Power source;

[0054] 10. External circulation subsystem; 11. Refrigerator; 12. External circulation pipeline; 121. Main circuit; 122. Branch circuit; 13. External circulation pump; 14. External temperature sensor; 15. Water storage device; 151. High temperature side; 152. Low temperature side;

[0055] 20. Internal circulation subsystem; 21. Cooling pipeline; 22. Heat exchange device; 23. Internal circulation pump; 24. Internal temperature sensor; 25. Pressure sensor; 26. Conductivity sensor; 27. Deionization device;

[0056] 30. Internal circulation water replenishment device; 31. Water inlet pipeline; 32. Water replenishment pipeline; 33. Water storage tank; 34. Filter; 35. Deionizer; 36. Drain pipeline; 37. Open and close valve. DETAILED DESCRIPTION

[0057] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0058] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0059] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0060] The boron neutron capture device mainly includes an ion source, an accelerator, a high-energy beam line, a target and a beam shaper. The ion source generates the initial charged ions, specifically, using electron bombardment to ionize gas molecules, ionize atoms on the solid surface, gas discharge ionization, Hess field ionization and other methods to generate ions, and then the ions are drawn out into a beam, which can be Penning ion source, electron cyclotron resonance ion source, dual plasma ion source, etc. The accelerator accelerates the ions to the required high energy; after such a high-energy ion beam is drawn out, it bombards a specific target to generate a neutron beam for treatment; the accelerator accurately controls the parameters such as the energy and beam intensity of the ions to ensure that the generated neutron beam has suitable characteristics, such as suitable energy distribution and sufficient flux, to achieve accurate and effective treatment of tumor cells; specifically, Penning ion source, electron cyclotron resonance ion source, dual plasma ion source can be used. At the same time, the accelerator also has a power source to provide the required high-frequency power for acceleration structures such as radio frequency quadrupole accelerators to ensure that the particle beam can obtain sufficient energy for acceleration; specifically, the power source realizes precise control of the amplitude and phase of the high-frequency field in the acceleration cavity through a digital low-level control system (LLRF), which is crucial to maintaining the stable operation of the accelerator. The target is a neutron target, whose main function is to generate neutrons. It is also responsible for controlling the energy distribution of neutrons to ensure that the generated neutrons are suitable for BNCT treatment; target materials include elements such as lithium and beryllium, as well as fixed targets and rotating targets. The high-energy beam transport line includes systems such as quadrupole magnets, octupole magnets, power supplies, vacuum, water cooling, and beam diagnostics, which can amplify and focus the ion beam to make the beam uniform; it is responsible for transmitting, focusing and adjusting the ion beam to ensure that it accurately hits the target material to generate neutrons, while performing real-time monitoring and safety protection.

[0061] The above-mentioned ion source, accelerator, octopole magnet, quadrupole magnet, target and other equipment will generate a large amount of heat during operation, and the above-mentioned equipment itself has a high-pressure working environment. Therefore, ordinary water cooling systems cannot be directly used for the equipment because the cooling water contains more impurities and has higher conductivity.

[0062] Based on this, the embodiment of the present application provides a water cooling system for a boron neutron capture device, which is applied to a boron neutron capture device. Figure 1 As shown, the system of this embodiment includes an external circulation subsystem 10 and a plurality of internal circulation subsystems 20. The external circulation subsystem 10 and the internal circulation subsystem 20 are linked and can be automatically controlled so that the temperature of the boron neutron capture device is within a suitable range, and the conductivity and pH value of the cooling water in the water cooling system meet the safe operation requirements of the boron neutron capture device, thereby ensuring the normal operation of the equipment.

[0063] Specifically, the external circulation subsystem 10 is used to provide a cold source for the internal circulation subsystem 20. The number of internal circulation subsystems 20 is greater than or equal to 2. In practical applications, one external circulation subsystem 10 can provide a cold source for one internal circulation subsystem 20, or can provide a cold source for multiple internal circulation subsystems 20; the external circulation subsystem 10 can provide a cold source by water cooling, air cooling, or direct refrigeration. In this embodiment, in order to ensure the stability of the cold source, a water-cooled heat exchange method is used to provide a cold source for the internal circulation subsystem 20.

[0064] As attached Figure 1 The internal circulation subsystem 20 of this embodiment includes a cooling pipeline 21, a heat exchange device 22, an internal circulation pump 23, an internal temperature sensor 24, a pressure sensor 25, a conductivity sensor 26 and an internal circulation water replenishment device 30.

[0065] Cooling water flows in the cooling pipeline 21, and the cooling pipeline 21 is connected to the heat exchange device 22 for performing heat exchange with the external circulation subsystem 10, that is, the cooling water enters the heat exchange device 22, performs heat exchange with the low-temperature external circulation subsystem 10 and cools down; the cooling pipeline 21 also performs heat exchange with the corresponding equipment of the boron neutron capture device, and performs heat exchange with the corresponding equipment after cooling down, so that the corresponding equipment is cooled down and maintains a normal working temperature; a circulating pump, an internal temperature sensor 24 and a conductivity sensor 26 are arranged on the cooling pipeline 21, wherein the circulating pump is used to drive the cooling water to flow in the cooling pipeline 21 and can control its flow rate, and the internal temperature sensor 24 can It is capable of detecting the water temperature of the cooling water in the cooling pipeline 21. Generally, a loop of the cooling pipeline 21 is set on the corresponding equipment. The cooling water in the loop is heated up by the temperature of the receiving equipment. If the water temperature in the loop exceeds the temperature setting value, it means that the current cooling amount is insufficient. Then the circulation pump can be controlled to increase the cooling water flow rate, and the external circulation subsystem 10 can also be controlled to increase the cooling amount. When the cooling water flow rate is increased, the water pressure in the cooling pipeline 21 will increase. Therefore, if the water pressure is greater than the high pressure value, it is necessary to control the frequency of the internal circulation pump 23 to reduce, that is, to reduce the cooling water flow rate. If the water temperature in the loop still exceeds the temperature setting value at this time, it is necessary to control the external circulation subsystem 10 to further increase the cooling amount.

[0066] The internal circulation water replenishing device 30 is in communication with the cooling pipeline 21 and is in communication connection with the conductivity sensor 26, and is used to replenish deionized water to the cooling pipeline 21 when the conductivity in the cooling pipeline 21 is higher than a first set value, thereby reducing the conductivity of the cooling water;

[0067] In the above-mentioned equipment, the accelerator 2 and the target 1 have higher requirements on the conductivity of water than the high-energy beam line 3 and the power source 4. Therefore, at least one internal circulation subsystem 20 further includes a deionizer 27, which is arranged on the cooling pipeline 21 and is used to deionize the cooling water in the cooling pipeline 21. In other words, the deionizer 27 is directly connected to the cooling pipeline 21, and the conductivity of the cooling water is reduced after passing through the deionizer 27. The deionizer 27 can be an ion exchange system. The deionizer 27 can directly remove impurities in the cooling water and reduce the conductivity without affecting the cooling water flow in the cooling pipeline 21.

[0068] The internal circulation subsystem 20 with the deionization device 27 is used to cool down the accelerator 2 and the target 1. In practical applications, the accelerator 2 and the ion source can share the same internal circulation subsystem, i.e., the ion source accelerator cooling subsystem, or the accelerator 2 and the target 1 can share an internal circulation subsystem 20 with the deionization device 27, i.e., the first cooling subsystem; or they can correspond to the internal circulation subsystem 20 with the deionization device 27 respectively. The high-energy beam line 3 and the power source 4 can share an internal circulation subsystem 20 without the deionization device 27, i.e., the second cooling subsystem; or they can correspond to the internal circulation subsystem 20 without the deionization device 27 respectively.

[0069] Preferably, the several internal circulation subsystems 20 of this embodiment include a target cooling subsystem corresponding to the target 1, an ion source accelerator cooling subsystem corresponding to the ion source and accelerator 2, a high-energy beam line cooling subsystem corresponding to the high-energy beam line 3, and a power source cooling subsystem corresponding to the power source 4. The target cooling subsystem and the ion source accelerator cooling subsystem both include a deionization device 27. Apart from this, the other structures are the same.

[0070] Specifically, the accelerator 2 corresponding to this embodiment is a RFQ accelerator 2 whose main material is copper. The low conductivity deionized water can prevent the impurity ions in the water from having a substitution reaction with the copper. Therefore, for the ion source accelerator cooling subsystem, it has at least three cooling pipeline 21 inlets, which can be respectively injected with cooling water, and the temperature range of the cooling water is 15°C-25°C, and the cooling water flow rate is 86.5m 3 / h, the particle size of the cooling water is less than or equal to 100μm, the dissolved oxygen content of the cooling water is less than or equal to 200ppm, and the conductivity range of the cooling water is: 0.5-1μs / cm; based on the deionization device 27 on the cooling pipeline 21, the conductivity of the cooling water can be close to 0.5μs / cm and not higher than 1μs / cm.

[0071] The target 1 system of this embodiment generates dark current during operation, and the low-conductivity deionized water can collect the current; therefore, for the target cooling subsystem, it has at least three cooling pipeline 21 inlets, which can be respectively injected with cooling water, and the temperature range of the cooling water is 5°C-15°C, and the cooling water flow rate is 10m 3 / h, the particle size of the cooling water is less than or equal to 100μm, the dissolved oxygen content of the cooling water is less than or equal to 200ppm, and the conductivity range of the cooling water is: 0.5-1μs / cm; based on the deionization device 27 on the cooling pipeline 21, the conductivity of the cooling water can be close to 0.5μs / cm and not higher than 1μs / cm.

[0072] The power source cooling subsystem has at least 8 cooling pipe 21 inlets, which can be respectively injected with cooling water, and the temperature range of the cooling water is 20℃-30℃, and the cooling water flow rate is 52m 3 / h, the particle size of the cooling water is less than or equal to 100μm, the dissolved oxygen content of the cooling water is less than or equal to 200ppm, and the conductivity range of the cooling water is: 0.5-1.5μs / cm; based on the deionized water replenished in time by the internal circulation water replenishment device 30, the conductivity of the cooling water is close to 1μs / cm and not higher than 1.5μs / cm.

[0073] For the high energy beam line cooling subsystem, it has at least two cooling pipe 21 inlets, which can be injected with cooling water respectively, and the temperature range of the cooling water is 20℃-30℃, and the cooling water flow rate is 39.5m 3 / h, the particle size of the cooling water is less than or equal to 100μm, the dissolved oxygen content of the cooling water is less than or equal to 200ppm, and the conductivity range of the cooling water is: 0.5-1.5μs / cm; based on the deionized water replenished in time by the internal circulation water replenishment device 30, the conductivity of the cooling water is close to 1μs / cm and not higher than 1.5μs / cm.

[0074] In the above-mentioned several internal circulation subsystems 20, the internal circulation water replenishment device 30 includes a water inlet pipeline 31, a water replenishment pipeline 32, a water storage tank 33, a filter 34 and a deionizer 35. The water inlet pipeline 31 is connected to the water storage tank 33. The filter 34 and the deionizer 35 are arranged on the water inlet pipeline 31. The water storage tank 33 is used to store deionized water. The water replenishment pipeline 32 is connected to the cooling pipeline 21 and the water storage tank 33. The tap water passes through the filter 34 to filter impurities and microorganisms to become filtered water. The filtered water passes through the deionizer 35 to remove ions and becomes deionized water, and then stored in the water storage tank 33. The deionizer 35 is an EDI deionization system. A liquid level sensor is provided on the water storage tank 33. When the liquid level sensor detects that the deionized water in the water storage tank 33 does not reach the set height, the system controls the water inlet pipeline, the filter 34 and the deionizer 35 to automatically work and replenish the deionized water to the water storage tank 33. The deionized water in the water storage tank 33 enters the cooling pipeline through the water replenishment pipe.

[0075] Each internal circulation subsystem 20 may have an internal circulation water replenishing device 30, or a plurality of internal circulation subsystems 20 may share one internal circulation water replenishing device 30. Figure 1 As shown, the cooling pipeline 21 of each internal circulation subsystem 20 is connected to the water supply pipeline 32 respectively, and the water supply pipeline 32 is provided with an on-off valve 37 corresponding to each internal circulation subsystem 20; when the on-off valve 37 is opened, the water supply pipeline 32 supplies water to the cooling pipeline 21 of the internal circulation subsystem 20.

[0076] Furthermore, the cooling pipeline 21 is also connected to a drainage pipeline 36 to discharge excess cooling water in the cooling pipeline 21 to avoid excessive water pressure in the cooling pipeline 21. Each drainage pipeline 36 is also provided with an on-off valve 37 for controlling the opening and closing of drainage management.

[0077] Based on the above structure, the water replenishment logic of the system of this embodiment is: after detecting that the conductivity in the cooling pipeline 21 is higher than the first set value, the drainage pipeline 36 starts to drain, and the pressure sensor 25 detects the water pressure value in the cooling pipeline 21 in real time. If it is detected that the water pressure value reaches the low pressure value, the drainage pipeline 36 is closed, and the amount of cooling water discharged is calculated based on the water pressure value, and then the water replenishment pipeline 32 is opened to replenish deionized water to the cooling pipeline 21 until it is detected that the water pressure value reaches the pressure setting value, and the water replenishment is stopped. At this time, the conductivity is also lower than the first set value or lower than the second set value; under normal circumstances, the water replenishment speed meets the requirement of completing the water replenishment within 1 minute.

[0078] The method of determining the water replenishment amount based on the water pressure value is because, on the one hand, the use environment and volume of the equipment are different, the volume of cooling water inside it is also different, and the corresponding water replenishment amount is also different. Therefore, it is more convenient to control the water replenishment amount by the water pressure value; on the other hand, during the water replenishment process, the cooling water and deionized water are not completely mixed, which may cause the conductivity of some areas to be different from the conductivity of the conductivity sensor detection area, and the conductivity detection is inaccurate. If the conductivity is directly used to determine whether to stop water replenishment, it may lead to incomplete water replenishment, thereby affecting the water replenishment efficiency and effect.

[0079] As attached Figure 1 As shown, the external circulation subsystem 10 of this embodiment includes a refrigerator 11, an external circulation pipeline 12, an external circulation pump 13, an external temperature sensor 14 and a water storage device 15. The refrigerator 11 is connected to the water storage device 15 and cools; the external circulation pipeline 12 includes a main loop 121 and a plurality of branches 122. The main loop 121 connects the plurality of branches 122 and the water storage device 15, and is used to return the heated water to the water storage device 15. The external temperature sensor 14 is arranged on the main loop 121, and the plurality of branches 122 respectively exchange heat with the cooling pipelines 21 of the plurality of internal circulation subsystems 20 through the heat exchange device 22; the external circulation pump 13 is respectively arranged on the branch 122 corresponding to each internal circulation subsystem 20, and is used to control the cooling amount based on the detection data of the external temperature device.

[0080] Specifically, the water storage device 15 includes a low temperature side 152 and a high temperature side 151. The high temperature side 151 is connected to the main circuit 121 and the refrigerator 11 respectively, and the low temperature side 152 is connected to the refrigerator 11 and several branches 122 respectively; the high temperature side 151 is provided with a water inlet, a liquid level sensor and an overflow valve; the water in the main circuit 121 flows back to the high temperature side 151, and then flows into the low temperature side 152 after cooling and cooling by the refrigerator 11. The low temperature water of the low temperature side 152 enters each branch 122 through the external circulation pump 13, and exchanges heat with the cooling water of the corresponding cooling pipeline 21 in each heat exchange device 22. The heated water enters the main circuit 121 and circulates in this way. When the return water temperature in the main circuit 121 is greater than the return water setting value, the frequency of the external circulation pump 13 is increased, and the cooling amount is increased until the return water temperature is lower than the return water setting value, and the cooling water of the internal circulation subsystem 20 is quickly exchanged with heat, thereby playing a cooling role.

[0081] Preferably, in order to ensure the stable operation of the internal circulation subsystem 20, each internal circulation subsystem 20 has at least two internal circulation pumps 23, and the internal circulation pump 23 has an automatic switching conduction module for conducting the cooling pipeline 21 when one of the internal circulation pumps 23 fails; before starting the internal circulation pump 23, first compare the cumulative operating time of the two internal circulation pumps 23, select the internal circulation pump 23 with the shorter cumulative operating time and without faults to run, and use the other as a spare. When the running internal circulation pump 23 fails, switch to the other spare internal circulation pump 23, always keep the cooling pipeline 21 conducting, and the internal circulation subsystem 20 can perform cooling work normally; at the same time, notify the staff to repair or replace the faulty internal circulation pump 23.

[0082] Preferably, in order to ensure the stable operation of the external circulation subsystem 10, there are at least two external circulation pumps 13 on each branch 122 of the external circulation subsystem 10, and the external circulation pump 13 has an automatic switching conduction module for conducting the corresponding branch 122 when one of the external circulation pumps 13 fails; before starting the external circulation pump 13, first compare the cumulative running time of the two external circulation pumps 13, select the external circulation pump 13 with the shorter cumulative running time and no faults to run, and the other is used as a spare. When the running external circulation pump 13 fails, switch to the other spare external circulation pump 13, always keep the branch 122 conducting, and the external circulation subsystem 10 can perform cooling work normally; at the same time, notify the staff to repair or replace the faulty external circulation pump 13.

[0083] In order to achieve more accurate and efficient control, the system of this embodiment includes a main control module (not shown), that is, all sensors, all pumps and switch valves in the system of this embodiment are connected to the main control module, and the data of the sensors are uploaded to the main control module, which performs logical judgment and controls the operation of each pump and switch valve. The main control module can be a PID closed-loop control module.

[0084] All the above pipes, valves and pumps are required to be made of SUS304 to reduce impurities in the cooling water.

[0085] Based on the water cooling system of the above embodiment, the embodiment of the present invention further provides a water cooling method for a boron neutron capture device, which specifically includes the following steps:

[0086] Start the external circulation subsystem 10 to provide a cold source;

[0087] The inner circulation subsystem 20 is started, the cooling pipe 21 exchanges heat with the outer circulation subsystem 10, the cooling pipe 21 exchanges heat with the corresponding equipment of the boron neutron capture device, and the conductivity, water temperature and water pressure in the cooling pipe 21 of each inner circulation subsystem 20 are detected in real time;

[0088] If the conductivity is greater than or equal to the second set value, the deionization device 27 is started, and if there is no deionization device 27, it is not started;

[0089] If the conductivity is greater than or equal to the first set value, the internal circulation water replenishment device 30 is started; the second set value is less than the first set value;

[0090] If the water temperature is greater than the temperature setting value, the external circulation subsystem 10 is controlled to increase the cooling capacity, and / or the internal circulation pump 23 is controlled to increase the frequency;

[0091] If the water pressure is greater than the high pressure value, the frequency of the internal circulation pump 23 is controlled to be reduced, and / or the drainage pipeline 36 is controlled to drain water.

[0092] Specifically, corresponding to the internal circulation subsystems 20 of different devices, because the conductivity requirements are different, the set value of the conductivity includes a first set value and a second set value, and the second set value is lower than the first set value. For the target cooling subsystem and the ion source accelerator cooling subsystem, these internal circulation subsystems 20 include a deionization device 27, and require a lower conductivity. Therefore, when the conductivity is greater than or equal to the second set value, these internal circulation subsystems 20 need to start the deionization device 27 first to quickly reduce the conductivity, and can also start the internal circulation water replenishment device 30 simultaneously. , and the conductivity can be further quickly reduced by water replenishment; if the conductivity cannot be reduced when the deionization device 27 is turned on alone, the staff must be notified to come and inspect the deionization device 27, and the internal circulation water replenishment device 30 must be turned on in time; and for the internal circulation subsystem 20 without the deionization device 27, the conductivity requirement can be appropriately relaxed, so even if the second set value is reached, the normal water cooling of the equipment can still be guaranteed, and when the conductivity is greater than or equal to the first set value, the internal circulation water replenishment device 30 must be turned on to quickly reduce the conductivity by water replenishment.

[0093] At the same time, if the water temperature of the cooling water is greater than the temperature setting value, the external circulation subsystem 10 is controlled to increase the cooling amount so that the cooling water temperature is further reduced, or the internal circulation pump 23 is controlled to increase the frequency so that the heat exchange speed of the cooling water becomes faster, or the two methods are performed in parallel, that is, the external circulation subsystem 10 is controlled to increase the cooling amount, and the internal circulation pump 23 is controlled to increase the frequency; in this embodiment, the internal circulation pump 23 is preferentially controlled to increase the frequency until the water pressure of the cooling water is equal to the high pressure value;

[0094] At the same time, if the water pressure is greater than the high pressure value, the frequency of the internal circulation pump 23 is controlled to be reduced; or the drainage pipe 36 is controlled to drain water, and the frequency of the internal circulation pump 23 is controlled to be reduced first. For example, the high pressure value is 0.7Mpa, the pressure setting value is 0.6Mpa, and the low pressure value is 0.4Mpa. If the water pressure is greater than 0.7Mpa, the frequency of the internal circulation pump 23 needs to be controlled to be reduced or the drainage pipe 36 needs to be controlled to drain water so that the water pressure is equal to 0.7Mpa or 0.6Mpa; when the water pressure is less than 0.4Mpa, the frequency of the internal circulation pump 23 needs to be controlled to be increased so that the water pressure is equal to 0.4Mpa or 0.6Mpa, which is set based on different usage scenarios.

[0095] Furthermore, the water replenishment step includes: if the conductivity is greater than the first set value and the duration is higher than the time threshold, the drainage is started, and the water pressure value in the cooling pipeline 21 is detected in real time. If the water pressure value reaches the low pressure value, the drainage is stopped, the internal circulation water replenishment device 30 is started, and the water replenishment pipeline 32 is opened to replenish deionized water to the cooling pipeline 21; and then when it is determined that the water pressure value is equal to the pressure setting value, the water replenishment pipeline 32 is closed.

[0096] Taking the target cooling subsystem as an example, the first set value of the conductivity is 1μs / cm, and the second set value is 0.9μs / cm. When the conductivity of the cooling water in the cooling pipeline 21 is detected to be 0.9μs / cm, the deionization device 27 is turned on first. If the conductivity cannot be reduced and the duration is longer than 10s, the drainage is turned on. When the water pressure value drops to the low pressure value, that is, 0.4Mpa, the drainage is stopped, and the frequency of the internal circulation pump 23 is kept unchanged. At this time, the internal circulation subsystem 20 can still operate normally; then the internal circulation water replenishment device 30 is started, the water replenishment pipeline 32 is opened, and the cooling pipeline 21 is replenished with deionized water until the water pressure value is equal to the pressure setting value, that is, 0.6Mpa, and the conductivity of the cooling water drops below 0.9μs / cm. If the water pressure value is found to be greater than 0.7Mpa during operation, the frequency of the internal circulation pump 23 is controlled to be reduced first. If the water pressure value cannot be reduced, the drainage pipeline 36 is controlled to drain water until the water pressure is equal to 0.6Mpa, and the drainage is stopped.

[0097] Taking the power source cooling subsystem as an example, the first set value of the conductivity is 1μs / cm. When it is detected that the conductivity of the cooling water in the cooling pipeline 21 is 1μs / cm and the duration is higher than 10s, the drainage is started. When the water pressure value drops to the low pressure value, that is, 0.4Mpa, the drainage is stopped, and the frequency of the internal circulation pump 23 is kept unchanged. At this time, the internal circulation subsystem 20 can still operate normally; then the internal circulation water replenishment device 30 is started, the water replenishment pipeline 32 is opened, and deionized water is replenished to the cooling pipeline 21 until the water pressure value is equal to the pressure setting value, that is, it is stopped at 0.6Mpa. At this time, the conductivity of the cooling water drops below 1μs / cm.

[0098] Specifically, the method of this embodiment also includes a cold source starting step: starting the refrigerator 11 and the external circulation pump 13, the refrigerator 11 cools the water in the water storage device 15 and inputs it into the low-temperature side 152, the water exchanges heat with the heat exchange device 22 of the corresponding internal circulation subsystem 20 through a plurality of branches 122, and then flows back to the main loop 121, and the return water temperature in the main loop 121 is detected in real time; if the return water temperature is greater than the return water setting value, the frequency of the external circulation pump 13 is increased, and the cooling amount is increased until the return water temperature is lower than the return water setting value.

[0099] Specifically, in order to further improve the cooling capacity and adjustable range of the external circulation subsystem 10, starting the external circulation subsystem 10 and providing a cold source also include the following steps: there are multiple refrigerators 11, including a main refrigerator and a standby refrigerator, and each refrigerator 11 is correspondingly provided with a chilled water pump; when starting the external circulation subsystem 10, start the main refrigerator and the corresponding chilled water pump; based on the relationship between the outlet water temperature and the chilled water temperature setting value, load or unload the number of standby refrigerators and the corresponding number of chilled water pumps to be started; the priority of the standby refrigerator is based on the accumulated running time, the standby refrigerator with less accumulated running time and no faults is loaded first, and the standby refrigerator with longer accumulated running time is unloaded first.

[0100] The above-mentioned embodiments are only preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A water cooling system for a boron neutron capture device, characterized in that: Applicable to a boron neutron capture device, the boron neutron capture device comprising a target, an ion source, an accelerator, a high-energy beam line and a power source; The system includes an external circulation subsystem and a plurality of internal circulation subsystems. The external circulation subsystem is used to provide a cold source for the internal circulation subsystem; The internal circulation subsystem includes a cooling pipeline, a heat exchange device, an internal circulation pump, an internal temperature sensor, a pressure sensor, a conductivity sensor and an internal circulation water replenishment device. The cooling pipeline is connected to the heat exchange device and is used to perform heat exchange with the external circulation subsystem; the cooling pipeline also performs heat exchange with the corresponding equipment of the boron neutron capture device; the circulation pump, the internal temperature sensor and the conductivity sensor are arranged on the cooling pipeline, and the internal circulation water replenishment device is in communication with the cooling pipeline and is in communication connection with the conductivity sensor, and is used to replenish deionized water to the cooling pipeline when the conductivity in the cooling pipeline is higher than a first set value; At least one of the internal circulation subsystems further includes a deionization device, which is disposed on the cooling pipeline and is used for deionizing cooling water in the cooling pipeline.

2. The system according to claim 1, characterized in that The cooling pipeline is also connected to a drainage pipeline, and the pressure sensor is also used to detect the water pressure value in the cooling pipeline after detecting that the conductivity in the cooling pipeline is higher than the first set value and the drainage pipeline is opened for drainage, and control the closure of the drainage pipeline when the water pressure value reaches the low pressure value; The internal circulation water replenishing device is used to open after the pressure sensor detects that the water pressure value reaches the low pressure value and closes the drainage pipeline, so as to replenish deionized water to the cooling pipeline.

3. The system according to claim 1, characterized in that The internal circulation water replenishment device includes a water inlet pipeline, a water replenishment pipeline, a water storage tank, a filter and a deionizer. The water inlet pipeline is connected to the water storage tank, the filter and the deionizer are arranged on the water inlet pipeline, and the water storage tank is used to store deionized water; the water replenishment pipeline is connected to the cooling pipeline and the water storage tank.

4. The system according to claim 1, characterized in that The plurality of internal circulation subsystems include a target cooling subsystem corresponding to the target, an ion source accelerator cooling subsystem corresponding to the ion source and the accelerator, a high energy beam line cooling subsystem corresponding to the high energy beam line, and a power source cooling subsystem corresponding to the power source, and the target cooling subsystem and the ion source accelerator cooling subsystem both include a deionization device; or, The plurality of internal circulation subsystems include a first cooling subsystem corresponding to the target, ion source and accelerator, and a second cooling subsystem corresponding to the high energy beam line and power source, wherein the first cooling subsystem includes a deionization device; and / or Each internal circulation subsystem has at least two internal circulation pumps, and the internal circulation pumps are provided with an automatic switching conduction module for conducting the cooling pipeline when one of the internal circulation pumps fails.

5. The system according to claim 1, wherein: The external circulation subsystem includes a refrigerator, an external circulation pipeline, an external circulation pump, an external temperature sensor and a water storage device, and the refrigerator is connected to the water storage device for cooling; The external circulation pipeline includes a main circuit and a plurality of branches, the main circuit connects the plurality of branches with the water storage device, and is used to return the heated water to the water storage device, the external temperature sensor is arranged on the main circuit, and the plurality of branches respectively exchange heat with the cooling pipelines of the plurality of internal circulation subsystems through a heat exchange device; The external circulation pump is respectively arranged on the branch corresponding to each of the internal circulation subsystems, and is used to control the cooling amount based on the detection data of the external temperature device.

6. The system according to claim 5, characterized in that The water storage device comprises a low temperature side and a high temperature side, the high temperature side is respectively connected to the main circuit and the refrigerator, and the low temperature side is respectively connected to the refrigerator and a plurality of branches; the high temperature side is provided with a water inlet, a liquid level sensor and an overflow valve; and / or There are at least two external circulation pumps on each branch line, and the external circulation pumps are provided with an automatic switching conduction module for conducting the branch line when one of the external circulation pumps fails.

7. The system according to claim 1, characterized in that The particle size of the particles in the cooling water in the cooling pipeline is less than or equal to 100 μm; and / or The dissolved oxygen content of the cooling water in the cooling pipeline is less than or equal to 200 ppm; and / or The conductivity range of the cooling water in the cooling pipeline is: 0.5-1μs / cm.

8. A water cooling method for a boron neutron capture device, characterized in that: The boron neutron capture device water cooling system according to any one of claims 1 to 7 comprises the following steps: Start the external circulation subsystem to provide a cold source; The inner circulation subsystem is started, the cooling pipeline exchanges heat with the outer circulation subsystem, the cooling pipeline exchanges heat with the corresponding equipment of the boron neutron capture device, and the conductivity, water temperature and water pressure in the cooling pipeline of each inner circulation subsystem are detected in real time; If the conductivity is greater than or equal to the second set value, the deionization device is started, and if there is no deionization device, it is not started; If the conductivity is greater than or equal to the first set value, the internal circulation water replenishment device is started; the second set value is less than the first set value; If the water temperature is greater than the temperature setting value, the external circulation subsystem is controlled to increase the cooling capacity, and / or the internal circulation pump is controlled to increase the frequency; If the water pressure is greater than the high pressure value, the frequency of the internal circulation pump is controlled to decrease, and / or the drainage pipeline is controlled to drain water.

9. The method according to claim 8, characterized in that If the conductivity is greater than the first set value, the step of starting the internal circulation water replenishment device also includes: If the conductivity is greater than the first set value and the duration is greater than the time threshold, then Start drainage and detect the water pressure value in the cooling pipeline in real time. If the water pressure value reaches the low pressure value, stop drainage, start the internal circulation water replenishment device, open the water replenishment pipeline, and replenish deionized water to the cooling pipeline; Then, when it is determined that the water pressure value is equal to the pressure setting value, the water supply pipeline is closed.

10. The method according to claim 8, characterized in that The starting of the external circulation subsystem to provide a cold source comprises the following steps: Start the refrigerator and the external circulation pump. The refrigerator cools the water in the water storage device and inputs it to the low-temperature side. The water exchanges heat with the heat exchange device of the corresponding internal circulation subsystem through several branches and then flows back to the main circuit. The return water temperature in the main circuit is detected in real time. If the return water temperature is greater than the return water set value, increase the frequency of the external circulation pump and increase the cooling capacity until the return water temperature is lower than the return water set value; and / or The starting of the external circulation subsystem to provide a cold source also includes the following steps: There are multiple refrigerators, including a main refrigerator and a standby refrigerator, and each refrigerator is provided with a corresponding chilled water pump; When starting the external circulation subsystem, start the refrigeration host and the corresponding ice water pump; Based on the relationship between the outlet water temperature and the chilled water temperature setting value, the number of refrigeration standby units started up with loading or unloading and the number of corresponding chilled water pumps; The priority of the standby refrigeration machine is based on the accumulated running time. The standby refrigeration machine with less accumulated running time and no faults is loaded first, and the standby refrigeration machine with longer accumulated running time is unloaded first.

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