Inert gas temperature control device and method for in-pile irradiation test

Abstract

The application provides an inert gas temperature control device and method for in-pile irradiation test, and relates to the technical field of temperature control of irradiation devices. The device comprises at least two temperature control pipelines and multiple temperature detection devices arranged in the irradiation device. The temperature control pipelines comprise an inert gas cylinder, an inlet pipe, an inlet valve, a pressure reducing valve, a buffer tank and a gas regulating instrument. The first end of the inlet pipe is connected with the inert gas cylinder, the second end of the inlet pipe is connected with the irradiation device, the inlet valve, the pressure reducing valve and the gas regulating instrument are arranged on the pipeline of the inlet pipe, and the pipeline of the inlet pipe is further connected with the buffer tank through a buffer pipe. When the inert gas cylinder stores a first inert gas, the corresponding temperature control pipeline is used to reduce the temperature of the irradiation device, and when the inert gas cylinder stores a second inert gas, the corresponding temperature control pipeline is used to increase the temperature of the irradiation device. The multiple temperature detection devices are arranged at multiple points in the irradiation device. The application has the advantages of higher reliability and faster response of temperature control.

Description

Technical Field

[0001] This invention relates to the field of temperature control technology for irradiation devices, and more specifically, to a device and method for controlling the temperature of inert gas in in-pile irradiation tests. Background Technology

[0002] During irradiation experiments, precise control of the experimental temperature range within the device is required to ensure that the material sample is irradiated within the specified temperature range and reaches the prescribed dose. Inert gases are typically used to regulate the experimental temperature within the irradiation device during irradiation experiments.

[0003] In existing technologies, temperature regulation typically uses a single-pipe inlet method. This involves two inert gases, one for heating and one for cooling, exiting from separate cylinders, passing through a storage tank and a high-precision gas regulator, mixing in a mixing section, and then connected to a single pipe before entering the irradiation device. This method is prone to slow temperature changes, resulting in temperature lag and excessive gas intake. It not only increases the workload for monitoring personnel but also frequently requires repeated temperature adjustments, ultimately leading to a large volume of radioactive waste gas and causing a series of problems for exhaust gas storage and emission. Furthermore, when the temperature regulation direction changes, i.e., when the inert gas needs to be replaced, the single-pipe inlet method requires the newly introduced gas to push the gas in the mixing section and subsequent pipes into the irradiation device. It takes time for the replaced inert gas to enter the active section of the irradiation device. Consequently, after temperature regulation begins, the lag in temperature change can easily lead to increased gas intake, resulting in over-adjustment of the temperature.

[0004] Therefore, it is urgent to optimize the temperature control method of irradiation devices to achieve a more reliable and faster-responding temperature control method. Summary of the Invention

[0005] The purpose of this invention is to provide an inert gas temperature control device and method for in-pile irradiation tests, which achieves a more reliable and faster temperature control method.

[0006] This invention is achieved through the following technical solution:

[0007] An inert gas temperature control device for in-pile irradiation tests is used to control the temperature inside the irradiation device within a preset temperature threshold range, including at least two temperature control pipelines and multiple temperature detection devices installed in the irradiation device.

[0008] The temperature control pipeline includes an inert gas cylinder, an inlet pipe, an inlet valve, a pressure reducing valve, a buffer tank, and a gas regulating instrument;

[0009] The inert gas cylinder is connected to the first end of the inlet pipe, and the second end of the inlet pipe is connected to the irradiation device. The inlet pipe is equipped with an inlet valve, a pressure reducing valve, and a gas regulating instrument for observing the gas flow rate. The inlet pipe is also connected to a buffer tank via a buffer pipe. When the inert gas cylinder stores the first inert gas, the corresponding temperature control pipe is used to lower the temperature of the irradiation device. When the inert gas cylinder stores the second inert gas, the corresponding temperature control pipe is used to raise the temperature of the irradiation device.

[0010] The temperature detection device is arranged at multiple points within the irradiation device.

[0011] Preferably, the number of temperature detection devices is 6, which are respectively arranged in the upper, middle and lower parts of the active section positive side inside the irradiation device, and in the upper, middle and lower parts of the active section negative side inside the irradiation device.

[0012] Preferably, there are two temperature control lines, one of which is used to lower the temperature of the irradiation device, and the other is used to raise the temperature of the irradiation device.

[0013] Preferably, the inert gas cylinder in the first temperature-controlled pipeline stores a first inert gas, and the inert gas cylinder in the second temperature-controlled pipeline stores a second inert gas.

[0014] Preferably, the first inert gas is helium, and the second inert gas is argon.

[0015] The present invention also provides a method for controlling the temperature of inert gas in an in-pile irradiation test, applied to the above-mentioned inert gas temperature control device for an in-pile irradiation test, comprising the following steps:

[0016] A standard temperature range [T1, T2] is set for the irradiation device;

[0017] Obtain the real-time measurement values ​​of all the temperature detection devices and compare them with the standard temperature range [T1, T2];

[0018] When the real-time measurement value of any of the temperature detection devices is higher than T2, the temperature is reduced through the first temperature control pipeline, and the inert gas cylinder of the first temperature control pipeline stores the first inert gas.

[0019] When the real-time measurement value of any of the temperature detection devices is lower than T1, the temperature is increased through the second temperature control pipeline, and the inert gas cylinder in the second temperature control pipeline stores the second inert gas.

[0020] Preferably, the method of cooling through the first temperature-controlled pipeline is as follows:

[0021] The inlet valve is opened, and the first inert gas is introduced into the irradiation device through the first temperature control pipeline at a gas flow rate of v. min ;

[0022] After time t, the real-time measurement value of the nth temperature detection device is obtained. N is the total number of the temperature detection devices;

[0023] Obtain the maximum difference ΔT between the real-time measurement value of the temperature detection device and the upper limit of the standard temperature range [T1, T2]. max,1 :

[0024]

[0025] If ΔT max,1 If the value is not greater than 0, the intake valve is closed; otherwise, the following operation is performed:

[0026] Obtain the gas flow rate v1 of the first inert gas, and perform cooling according to the gas flow rate v1:

[0027] v1 = min(v c ,v max );

[0028]

[0029] Among them, v c v is an intermediate parameter max The maximum permissible gas flow rate is given by v, where max is the function to find the maximum value and min is the function to find the minimum value. min Both α and e are parameters to be fitted, and e is the natural constant.

[0030] After time t', the intake valve is closed.

[0031] Preferably, the method for obtaining the parameters to be fitted is as follows:

[0032] An experiment was conducted when the real-time measured value of any of the temperature detection devices in the irradiation device was higher than T2, and the experimental data was fitted.

[0033] The fitting objective is to maximize the function F:

[0034]

[0035] Where L represents the number of experiments, and N represents the total number of temperature detection devices. The value is the real-time measurement value of the nth temperature detection device after the intake valve is closed in the low l-th experiment, and if is the truth function.

[0036] Preferably, the method of heating through the second temperature control pipeline is as follows:

[0037] The inlet valve is opened, and the second inert gas is introduced into the irradiation device through the second temperature control pipeline at a flow rate of v′. min ;

[0038] After time t, the real-time measurement value of the nth temperature detection device is obtained. N is the total number of the temperature detection devices;

[0039] Obtain the maximum difference ΔT between the real-time measurement value of the temperature detection device and the lower limit of the standard temperature range [T1, T2]. max,2 :

[0040]

[0041] If ΔT max,2 If the value is not greater than 0, the intake valve is closed; otherwise, the following operation is performed:

[0042] Obtain the gas flow rate v2 of the second inert gas, and increase the temperature according to the gas flow rate v2:

[0043] v2=min(v′ c ,v max );

[0044]

[0045] Where, v′ c v is an intermediate parameter max The maximum permissible gas flow rate is given by v′, where max is the function to find the maximum value and min is the function to find the minimum value. min Both α and α′ are parameters to be fitted, and e is the natural constant;

[0046] After time t', the intake valve is closed.

[0047] Preferably, the method for obtaining the parameters to be fitted is as follows:

[0048] An experiment was conducted when the real-time measured value of any of the temperature detection devices in the irradiation device was lower than T1, and the experimental data was fitted.

[0049] The fitting objective is to maximize the function F:

[0050]

[0051] Where L represents the number of experiments, and N represents the total number of temperature detection devices. The value is the real-time measurement value of the nth temperature detection device after the intake valve is closed in the low l-th experiment, and if is the truth function.

[0052] The technical solution of the present invention has at least the following advantages and beneficial effects:

[0053] This invention features multiple temperature-controlled pipelines, eliminating the gas mixing section in traditional solutions. A single gas directly enters the irradiation device. Because a single inert gas has high temperature regulation sensitivity, the flow rate and time of the gas entering the irradiation device can be precisely controlled, improving gas regulation efficiency while reducing the amount of inert gas used.

[0054] This invention incorporates multiple temperature detection devices, enabling comprehensive monitoring of temperature changes in the active section within the device and achieving more timely temperature control.

[0055] This invention uses a pressure reducing valve, a buffer tank, and a gas regulating instrument to precisely control the pressure and flow rate of inert gas, avoiding sudden pressure fluctuations and improving the reliability of the temperature control process.

[0056] This invention makes targeted adjustments to the inert gas flow rate based on actual detected temperature values, ensuring that the temperature regulation target can be achieved within a suitable time under any temperature conditions, thereby further improving the stability and reliability of temperature control.

[0057] The temperature control pipeline structure of this invention has a clear design and distinct functions, making it easy to disassemble, maintain, and replace. Temperature control pipelines and detection points can be added or removed according to actual needs, and it has good scalability and modularity, meeting the customized needs of different in-pile test projects. Attached Figure Description

[0058] Figure 1 This is a schematic diagram of the structure of an inert gas temperature control device for in-pile irradiation testing provided in Embodiment 1 of the present invention;

[0059] Figure 2 This is a schematic flowchart of an inert gas temperature control method for in-pile irradiation tests provided in Embodiment 2 of the present invention. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0061] Example 1

[0062] This embodiment provides an inert gas temperature control device for in-pile irradiation tests, used to control the temperature within the irradiation device within a preset temperature threshold range. (See reference...) Figure 1 This includes at least two temperature control lines and multiple temperature detection devices installed in the irradiation device;

[0063] The temperature control pipeline includes an inert gas cylinder, an inlet pipe, an inlet valve, a pressure reducing valve, a buffer tank, and a gas regulating instrument;

[0064] The inert gas cylinder is connected to the first end of the inlet pipe, and the second end of the inlet pipe is connected to the irradiation device. The inlet pipe is equipped with an inlet valve, a pressure reducing valve, and a gas regulating instrument for observing gas flow rate. The inlet pipe is also connected to a buffer tank via a buffer pipe. When the inert gas cylinder stores the first inert gas, the corresponding temperature control pipeline is used to lower the temperature of the irradiation device; when the inert gas cylinder stores the second inert gas, the corresponding temperature control pipeline is used to raise the temperature of the irradiation device. Preferably, in this embodiment, there are two temperature control pipelines: one for lowering the temperature of the irradiation device and the other for raising the temperature. Furthermore, the inert gas cylinder in the first temperature control pipeline stores the first inert gas, and the inert gas cylinder in the second temperature control pipeline stores the second inert gas. Preferably, the first inert gas is helium, and the second inert gas is preferably argon.

[0065] The temperature detection devices are arranged at multiple points within the irradiation device. In this embodiment, there are six temperature detection devices, which are respectively arranged at the upper, middle, and lower parts of the active positive side and the upper, middle, and lower parts of the active negative side inside the irradiation device.

[0066] Based on the above scheme, this embodiment has two temperature control pipelines. In each pipeline, the inert gas enters the buffer tank from the inert gas cylinder via a pressure reducing valve. The pipeline after the buffer tank is connected to a high-precision gas regulating instrument. During adjustment, the host computer can refer to the gas flow rate set by the high-precision gas regulating instrument to precisely control the gas flow rate and time entering the irradiation device, thereby achieving low-flow-rate, high-precision gas intake regulation. Compared with the traditional scheme, this embodiment eliminates the mixing section, with only a single gas directly entering the irradiation device. Because a single inert gas has high temperature regulation sensitivity, it improves gas regulation efficiency while ensuring that the irradiation experiment temperature remains within the required range for a longer period of time, and at the same time reduces the amount of inert gas used.

[0067] On the other hand, this embodiment is designed with 6 temperature measuring points, which can comprehensively monitor the temperature changes of the active section inside the device.

[0068] This embodiment can use a high-precision gas regulating instrument and a φ6mm×2mm stainless steel inlet pipe to ensure that a small amount of gas enters the irradiation device to the maximum extent, thereby achieving precise temperature control within the irradiation device. The temperature regulation accuracy can reach ±0.1℃, and it also reduces the amount of gas entering the device and the amount of exhaust gas generated.

[0069] Example 2

[0070] This embodiment provides a method for controlling the temperature of inert gas in an in-pile irradiation test, applied to an in-pile irradiation test inert gas temperature control device described in the above embodiment. (See attached document.) Figure 2 This includes the following steps:

[0071] A standard temperature range [T1, T2] is set for the irradiation device;

[0072] Obtain the real-time measurement values ​​of all the temperature detection devices and compare them with the standard temperature range [T1, T2];

[0073] When the real-time measurement value of any of the temperature detection devices is higher than T2, the temperature is reduced through the first temperature control pipeline, and the inert gas cylinder of the first temperature control pipeline stores the first inert gas.

[0074] When the real-time measurement value of any of the temperature detection devices is lower than T1, the temperature is increased through the second temperature control pipeline, and the inert gas cylinder in the second temperature control pipeline stores the second inert gas.

[0075] The method of cooling through the first temperature-controlled pipeline is as follows:

[0076] The inlet valve is opened, and the first inert gas is introduced into the irradiation device through the first temperature control pipeline at a gas flow rate of v. min ;

[0077] After time t, the real-time measurement value of the nth temperature detection device is obtained. N is the total number of the temperature detection devices;

[0078] Obtain the maximum difference ΔT between the real-time measurement value of the temperature detection device and the upper limit of the standard temperature range [T1, T2]. max,1 :

[0079]

[0080] If ΔT max,1 If the value is not greater than 0, the intake valve is closed; otherwise, the following operation is performed:

[0081] Obtain the gas flow rate v1 of the first inert gas, and perform cooling according to the gas flow rate v1:

[0082] v1 = min(v c ,v max );

[0083]

[0084] Among them, v c v is an intermediate parameter max The maximum permissible gas flow rate is given by v, where max is the function to find the maximum value and min is the function to find the minimum value. min Both α and e are parameters to be fitted, and e is the natural constant.

[0085] After time t', the intake valve is closed.

[0086] As a preferred embodiment, the method for obtaining the parameters to be fitted is as follows:

[0087] An experiment was conducted when the real-time measured value of any of the temperature detection devices in the irradiation device was higher than T2, and the experimental data was fitted.

[0088] The fitting objective is to maximize the function F:

[0089]

[0090] Where L represents the number of experiments, and N represents the total number of temperature detection devices. The value is the real-time measurement value of the nth temperature detection device after the intake valve is closed in the low l-th experiment, and if is the truth function.

[0091] On the other hand, the method of heating through the second temperature control pipeline is as follows:

[0092] The inlet valve is opened, and the second inert gas is introduced into the irradiation device through the second temperature control pipeline at a flow rate of v′. min ;

[0093] After time t, the real-time measurement value of the nth temperature detection device is obtained. N is the total number of the temperature detection devices;

[0094] Obtain the maximum difference ΔT between the real-time measurement value of the temperature detection device and the lower limit of the standard temperature range [T1, T2]. max,2 :

[0095]

[0096] If ΔT max,2 If the value is not greater than 0, the intake valve is closed; otherwise, the following operation is performed:

[0097] Obtain the gas flow rate v2 of the second inert gas, and increase the temperature according to the gas flow rate v2:

[0098] v2=min(v′ c ,v max );

[0099]

[0100] Where, v′ c v is an intermediate parameter max The maximum permissible gas flow rate is given by v′, where max is the function to find the maximum value and min is the function to find the minimum value. min Both α and α′ are parameters to be fitted, and e is the natural constant;

[0101] After time t', the intake valve is closed.

[0102] Similarly, the method for obtaining the parameters to be fitted is as follows:

[0103] An experiment was conducted when the real-time measured value of any of the temperature detection devices in the irradiation device was lower than T1, and the experimental data was fitted.

[0104] The fitting objective is to maximize the function F:

[0105]

[0106] Where L represents the number of experiments, and N represents the total number of temperature detection devices. The value is the real-time measurement value of the nth temperature detection device after the intake valve is closed in the low l-th experiment, and if is the truth function.

[0107] The automated control process provided in this embodiment can be implemented remotely based on a host computer.

[0108] First, this embodiment compares the real-time measurements from multiple temperature detection devices with the preset standard temperature range [T1, T2]. Depending on whether the temperature is too low or too high, the temperature control pipelines in two different directions, heating and cooling, can quickly activate the adjustment mechanism when the temperature at any measuring point deviates from the standard range. This effectively ensures that the temperature within the entire irradiation device is always maintained within the required range, improving the accuracy and stability of temperature control.

[0109] Then, when the temperature at any detection point exceeds the upper limit T2 or falls below the lower limit T1, the system can automatically select a cooling or heating path and activate the corresponding temperature control pipeline. During the temperature control process, the system first passes through the set minimum initial flow rate v within the initial time t. min or v′ minA preliminary temperature control process is quickly initiated to promptly correct abnormal temperature conditions. After the initial correction at time t, temperature is detected again. If any detection points still fall outside the standard temperature range [T1, T2], the gas flow rate is adjusted based on the deviation between the real-time temperature measurement of the detection point furthest from the standard temperature range and the standard temperature range. The adjustment aims to increase the flow rate as the deviation increases, but without exceeding the system's maximum allowable gas flow rate. Then, time t' is adjusted again. When fitting and obtaining control parameters, the primary goal is to ensure that the temperature has fallen within the standard temperature range by the end of the set two-terminal adjustment periods.

[0110] As a preferred option, the time t for the first stage is set to 5 minutes, and the time t' for the second stage is set to 10 minutes. The advantages of this phased adjustment are: in the initial stage of temperature control, when an abnormal temperature is detected, inert gas is immediately injected at the set minimum initial flow rate. This allows for rapid cooling or heating without the need for complex function calculations. This strategy effectively addresses potential temperature surges or localized overheating in the irradiation environment, significantly shortening the response time. In the second stage, after initial temperature control, the maximum deviation is calculated based on the temperature detection results, and the flow rate is dynamically calculated, enhancing the adaptive capability of temperature control when temperature deviations are large. When calculating the flow rate, a sigmoid function is used to control the flow rate. Even with large deviations, the increase in flow rate gradually slows down, and flow rate limits are implemented to prevent the control strategy from overreacting due to excessive temperature differences, which could lead to thermal shock to the equipment structure or rapid release of inert gas, thus improving the safety and robustness of the system's temperature control.

[0111] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An inert gas temperature control device for in-pile irradiation tests, used to control the temperature inside the irradiation device within a preset temperature threshold range, characterized in that, Includes at least two temperature control lines and multiple temperature detection devices installed in the irradiation device; The temperature control pipeline includes an inert gas cylinder, an inlet pipe, an inlet valve, a pressure reducing valve, a buffer tank, and a gas regulating instrument; The inert gas cylinder is connected to the first end of the inlet pipe, and the second end of the inlet pipe is connected to the irradiation device. The inlet pipe is equipped with an inlet valve, a pressure reducing valve, and a gas regulating instrument for observing the gas flow rate. The inlet pipe is also connected to a buffer tank through a buffer pipe. When the inert gas cylinder stores the first inert gas, the corresponding temperature control pipe is used to lower the temperature of the irradiation device. When the inert gas cylinder stores the second inert gas, the corresponding temperature control pipe is used to raise the temperature of the irradiation device. The temperature detection device is arranged at multiple points within the irradiation device; The method for controlling the inert gas temperature in an in-pile irradiation test using the aforementioned inert gas temperature control device includes the following steps: Set a standard temperature range for the irradiation device. ; Obtain real-time measurement values ​​from all the aforementioned temperature detection devices and compare them with the standard temperature range. Compare; When the real-time measurement value of any of the aforementioned temperature detection devices is higher than The temperature is then lowered through the first temperature-controlled pipeline, and the inert gas cylinder in the first temperature-controlled pipeline stores the first inert gas. When the real-time measured value of any of the aforementioned temperature detection devices is lower than The temperature is then increased through the second temperature control pipeline, and the inert gas cylinder in the second temperature control pipeline stores the second inert gas. The cooling method via the first temperature-controlled pipeline is as follows: The inlet valve is opened, and the first inert gas is introduced into the irradiation device through the first temperature control pipeline at a flow rate of [missing information]. ; After time t, the real-time measurement value of the nth temperature detection device is obtained. N is the total number of the temperature detection devices; Obtain the real-time measurement values ​​of the temperature detection device and the standard temperature range. The maximum difference of the upper limit : ； like If the value is not greater than 0, the intake valve is closed; otherwise, the following operation is performed: Obtain the gas flow rate of the first inert gas. And according to the gas flow rate Cool down: ； ； in, For intermediate parameters, The maximum permissible gas flow rate is defined by the function `max` to find the maximum value and `min` to find the minimum value. and All are parameters to be fitted, and e is the natural constant; Over time Then, close the intake valve.

2. The inert gas temperature control device for in-pile irradiation tests according to claim 1, characterized in that, The number of temperature detection devices is 6, which are respectively arranged in the upper, middle and lower parts of the active section positive side inside the irradiation device, and in the upper, middle and lower parts of the active section negative side inside the irradiation device.

3. The inert gas temperature control device for in-pile irradiation tests according to claim 1, characterized in that, The number of temperature control pipelines is two, one of which is used to lower the temperature of the irradiation device, and the other of which is used to raise the temperature of the irradiation device.

4. The inert gas temperature control device for in-pile irradiation tests according to claim 3, characterized in that, The inert gas cylinder in the first temperature-controlled pipeline stores a first inert gas, and the inert gas cylinder in the second temperature-controlled pipeline stores a second inert gas.

5. The inert gas temperature control device for in-pile irradiation tests according to claim 4, characterized in that, The first inert gas is helium, and the second inert gas is argon.

6. The inert gas temperature control device for in-pile irradiation tests according to claim 1, characterized in that, The method for obtaining the parameters to be fitted is as follows: The real-time measurement value of any of the temperature detection devices in the irradiation device is higher than Experiments were conducted, and the experimental data was used for fitting. The fitting objective is to maximize the function F: ； Where L represents the number of experiments, and N represents the total number of temperature detection devices. This represents the real-time measurement value of the nth temperature detection device after the intake valve is closed in the lth experiment, where if is a truth function.

7. The inert gas temperature control device for in-pile irradiation tests according to claim 1, characterized in that, The method of heating through the second temperature-controlled pipeline is as follows: The inlet valve is opened, and the second inert gas is introduced into the irradiation device through the second temperature control pipeline at a flow rate of [missing information]. ; After time t, the real-time measurement value of the nth temperature detection device is obtained. N is the total number of the temperature detection devices; Obtain the real-time measurement values ​​of the temperature detection device and the standard temperature range. The maximum difference of the lower limit : ； like If the value is not greater than 0, the intake valve is closed; otherwise, the following operation is performed: Obtain the gas flow rate of the second inert gas. And according to the gas flow rate Increase the temperature: ； ； in, For intermediate parameters, The maximum permissible gas flow rate is defined by the function `max` to find the maximum value and `min` to find the minimum value. and All are parameters to be fitted, and e is the natural constant; Over time Then, close the intake valve.

8. The inert gas temperature control device for in-pile irradiation tests according to claim 7, characterized in that, The method for obtaining the parameters to be fitted is as follows: The real-time measurement value of any of the temperature detection devices in the irradiation device is lower than Experiments were conducted, and the experimental data was used for fitting. The fitting objective is to maximize the function F: ； Where L represents the number of experiments, and N represents the total number of temperature detection devices. This represents the real-time measurement value of the nth temperature detection device after the intake valve is closed in the lth experiment, where if is a truth function.

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