Uranium concentration factory product abundance real-time monitoring method, device and system

Abstract

The invention belongs to the technical field of uranium concentration, and particularly relates to a uranium concentration factory product abundance real-time monitoring method, device and system. The method comprises the following steps: introducing UF6 gas to be measured into a measuring container, and obtaining the total count rate of gamma rays in the measuring container by using a NaI detector; acquiring abundance of the UF6 gas according to a background obtained in advance, the total count rate, a scale coefficient and the pressure and temperature in the measuring container; wherein the background is determined by the following steps of: measuring counting rates of characteristic gamma rays in the measuring container under different pressures by using a NaI detector to obtain a plurality of counting rates; the lower the pressure is, the longer the measurement time of the NaI detector is; and fitting the counting rate of the corresponding gamma ray when the pressure is zero according to the plurality of obtained counting rates and the corresponding pressure to obtain the background. According to the invention, the dependence of product abundance monitoring on operators is eliminated, the abundance measurement precision is ensured, and the operation and maintenance cost is reduced.

Description

Technical Field

[0001] The present application belongs to the technical field of uranium enrichment, and specifically relates to a method, device and system for real-time monitoring of product abundance in a uranium enrichment plant. Background Art

[0002] The product abundance of a uranium enrichment plant is the most important parameter in the production process. In order to ensure that the abundance of the final product meets user needs, the product abundance must be monitored during the production process. At present, the method used by domestic uranium enrichment plants for product abundance monitoring and operating condition adjustment is to use a gas mass spectrometer for sampling and analysis. Although this method has high measurement accuracy, the analysis cycle is long and the sampling process is more involved, involving sampling, freezing, purification, temperature recovery, etc. A measurement cycle is about 2 hours. When the system operating conditions are abnormal, it cannot reflect the changes in product abundance in real time and accurately. Summary of the invention

[0003] The purpose of this application is to provide a method, device and system for real-time monitoring of product abundance in a uranium enrichment plant, so as to solve the problem that the prior art cannot reflect the changes in product abundance in real time and accurately.

[0004] Technical solution to achieve the purpose of this application:

[0005] A first aspect of an embodiment of the present application provides a method for real-time monitoring of product abundance in a uranium enrichment plant, the method comprising:

[0006] Passing the UF6 gas to be measured into a measuring container, and obtaining the total gamma-ray count rate in the measuring container using a NaI detector;

[0007] Obtaining the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration factor, and the pressure and temperature in the measuring container;

[0008] Wherein, the background is determined by the following steps:

[0009] Using a NaI detector to measure the counting rate of characteristic gamma rays in the measuring container at different pressures to obtain a plurality of counting rates; the lower the pressure, the longer the measuring time of the NaI detector;

[0010] The background is obtained by fitting the gamma ray counting rate corresponding to the pressure of zero according to the obtained multiple counting rates and the corresponding pressures.

[0011] Optionally, the lower the pressure, the longer the measurement time of the NaI detector, which specifically includes:

[0012] For every 5 Torr decrease in pressure, the measurement time is extended by 50 seconds.

[0013] Optionally, the lower the pressure, the longer the measurement time of the NaI detector, which specifically includes:

[0014] For every 5 Torr decrease in pressure, the measurement time is extended by 30 seconds.

[0015] Optionally, obtaining the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration factor, and the pressure and temperature in the measuring container specifically includes:

[0016] The abundance E of the UF6 gas is calculated using the following formula:

[0017]

[0018] Where K is the known scale factor, S is the total count rate, and S b is the background, T is the temperature in the measurement container, and P is the pressure in the measurement container.

[0019] A second aspect of the embodiment of the present application provides a real-time monitoring device for product abundance of a uranium enrichment plant, comprising:

[0020] A first acquisition module is used to pass the UF6 gas to be measured into a measurement container and obtain the total gamma ray count rate in the measurement container using a NaI detector;

[0021] A second acquisition module is used to obtain the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration factor, and the pressure and temperature in the measurement container;

[0022] A third acquisition module is used to measure the counting rate of the characteristic gamma rays in the measurement container at different pressures using a NaI detector to obtain multiple counting rates; the lower the pressure, the longer the measurement time of the NaI detector;

[0023] The background acquisition module is used to fit the gamma ray counting rate corresponding to zero pressure according to the obtained multiple counting rates and corresponding pressures to obtain the background.

[0024] Optionally, the second acquisition module is specifically used to:

[0025] The abundance E of the UF6 gas is calculated using the following formula:

[0026]

[0027] Where K is the known scale factor, S is the total count rate, and S b is the background, T is the temperature in the measurement container, and P is the pressure in the measurement container.

[0028] A third aspect of the embodiment of the present application provides a real-time monitoring system for the abundance of a uranium enrichment plant product, characterized in that it is applied to any one of the real-time monitoring methods for the abundance of a uranium enrichment plant product provided in the first aspect of the embodiment of the present application; the system comprises: a measuring container, a NaI detector, a temperature sensor and a pressure sensor;

[0029] The inlet and outlet of the measuring container are connected to the front and rear ends of the concentrate flow booster through an inlet pipeline and an outlet pipeline respectively; the inlet pipeline and the outlet pipeline are connected in series with a solenoid valve for controlling the pressure;

[0030] The NaI detector is arranged at the measuring container and is used to obtain the gamma ray counting rate in the measuring container;

[0031] The temperature sensor and the pressure sensor are both connected to the measuring container and are used to measure the temperature and pressure of the measuring container.

[0032] Optionally, the system further comprises: a shielding shell;

[0033] The shielding shell is sleeved on the outer sides of the measuring container and the NaI detector.

[0034] A fourth aspect of an embodiment of the present application provides an electronic device, including a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, any one of the methods for real-time monitoring of product abundance in a uranium enrichment plant provided in the first aspect of the embodiment of the present application is executed.

[0035] A fifth aspect of the embodiments of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, any one of the methods for real-time monitoring of product abundance in a uranium enrichment plant provided in the first aspect of the embodiments of the present application is executed.

[0036] The beneficial technical effects of this application are:

[0037] The embodiment of the present application provides a method, device and system for real-time monitoring of product abundance in a uranium enrichment plant, the method comprising: passing the UF6 gas to be measured into a measuring container, obtaining the total count rate of gamma rays in the measuring container using a NaI detector; obtaining the abundance of the UF6 gas according to the background obtained in advance, the total count rate, the scale factor and the pressure and temperature in the measuring container; wherein the background is determined by the following steps: measuring the count rate of characteristic gamma rays in the measuring container at different pressures using a NaI detector to obtain multiple count rates; the lower the pressure, the longer the measurement time of the NaI detector; fitting the gamma ray count rate corresponding to zero pressure according to the obtained multiple count rates and the corresponding pressure to obtain the background. The embodiment of the present application gets rid of the dependence of product abundance monitoring on operating personnel, and the measurement of the background ensures the accuracy of abundance measurement, greatly reduces the amount of operation of operating personnel, and reduces operation and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of a process for real-time monitoring of product abundance in a uranium enrichment plant provided in an embodiment of the present application;

[0039] Figure 2 A schematic diagram of the structure of a real-time monitoring system for product abundance of a uranium enrichment plant provided in an embodiment of the present application.

[0040] In the figure:

[0041] 1- measuring container; 2- NaI detector; 3- temperature sensor; 4- pressure sensor; 5- solenoid valve; 6- shielding shell. DETAILED DESCRIPTION

[0042] In order to make those skilled in the art better understand the present application, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, not all. Based on the embodiments recorded in the present application, all other embodiments obtained by those skilled in the art without paying creative work are within the scope of protection of the present application.

[0043] See also Figure 1 , which is a flow chart of a method for real-time monitoring of product abundance in a uranium enrichment plant provided in an embodiment of the present application.

[0044] The embodiment of the present application provides a method for real-time monitoring of product abundance in a uranium enrichment plant, comprising:

[0045] Step S101: passing the UF6 gas to be measured into a measuring container, and obtaining the total gamma-ray count rate in the measuring container using a NaI detector;

[0046] Step S102: Obtaining the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration factor, and the pressure and temperature in the measuring container;

[0047] It is understandable that the NaI detector is very effective in measuring the concentration of gaseous UF6 in the container. 235 The intensity of the characteristic rays emitted by U is measured to obtain 235 The amount of U is measured by using a sensor to measure the pressure and temperature of the gas, and then the total amount of U in the UF6 gas is obtained according to the ideal gas state equation. The ratio of the two is 235 The abundance of U.

[0048] It should be noted that during the real-time monitoring of uranium abundance, UF6 gas continuously flows through the measuring container and undergoes chemical and physical adsorption with the inner wall of the container, thereby being deposited on the inner surface of the measuring container. 235 U also emits characteristic gamma rays, and high-energy cosmic rays and gamma rays in the surrounding environment also react with the NaI detector to form gamma ray counts. These factors together form the background of the measurement container. With the long-term operation of the monitor, the solid uranium deposits on the surface of the measurement container will continue to increase, and the background value of the real-time monitoring device will change, which needs to be measured regularly.

[0049] In the examples of the present application, the background is determined by the following steps:

[0050] Using a NaI detector to measure the counting rate of characteristic gamma rays in the measuring container at different pressures to obtain a plurality of counting rates; the lower the pressure, the longer the measuring time of the NaI detector;

[0051] The background is obtained by fitting the gamma ray counting rate corresponding to the pressure of zero according to the obtained multiple counting rates and the corresponding pressures.

[0052] In the embodiment of the present application, the background measurement adopts the "equal counting rate" measurement method, changes the gas pressure in the measuring container, and uses a NaI detector to measure the counting rate of the characteristic gamma rays in the measuring container. At the same time, in order to reduce the deviation of the counting rate measurement under low pressure, the measurement time is extended after each pressure reduction, and the measurement deviation is reduced by accumulation in the time dimension. Finally, the gamma-ray counting rate per unit time under different pressures is obtained, and a linear fit is performed on it to obtain the gamma-ray counting rate when the pressure is 0, which is the background.

[0053] The embodiments of the present application eliminate the reliance of product abundance monitoring on operating personnel. Background measurement ensures the accuracy of abundance measurement, greatly reduces the amount of operation for operating personnel, and cuts down on operating and maintenance costs.

[0054] In one example, the lower the pressure, the longer the measurement time of the NaI detector, specifically including:

[0055] For every 5 Torr decrease in pressure, the measurement time is extended by 50 seconds.

[0056] In another example, the lower the pressure, the longer the measurement time of the NaI detector, specifically including:

[0057] For every 5 Torr decrease in pressure, the measurement time is extended by 30 seconds.

[0058] In some possible implementations of the embodiments of the present application, step S102 may specifically include:

[0059] The abundance E of the UF6 gas is calculated using the following formula:

[0060]

[0061] Where K is the known scale factor, S is the total count rate, and S b is the background, T is the temperature in the measurement container, and P is the pressure in the measurement container.

[0062] In specific implementation, the measurement result of the above formula can be calibrated according to the abundance measured by the gas mass spectrometer to correct the calibration factor K.

[0063] A method for real-time monitoring of product abundance in a uranium enrichment plant provided by an embodiment of the present application is described in detail below with reference to a specific example.

[0064] The embodiment of the present application provides a method for real-time monitoring of product abundance in a uranium enrichment plant. First, the front and rear ends of the booster are connected to the inlet and outlet of the measuring container respectively. The measuring container is evacuated, and the qualified standard is ΔP≯0.2mmHg / 6h, and heated at a constant temperature for a period of time.

[0065] Slowly add material into the measuring container until the pressure reaches 3-5 mmHg, then close the valve, keep it for 10 minutes and then evacuate it, repeat this process 3 times.

[0066] The UF6 gas to be measured flows into the measuring container, replacing the original UF6 gas in the measuring container; after 5 minutes of gas replacement, the pressure is increased, and the NaI detector measures the UF6 gas in the measuring container. 235 The intensity of the U characteristic ray is measured for 5 minutes, and the gamma ray counting rate is calculated according to the set counting interval, and the UF6 in the container is calculated. 235 U abundance, after the measurement is completed, the gas replacement starts again and the cycle continues.

[0067] During background measurement, new UF6 gas flows into the measuring container to replace the original UF6 gas in the measuring container. After 5 minutes of gas replacement, the UF6 gas in the measuring container 235 U characteristic gamma ray counting rate, measuring time 300 seconds; after adjusting the pressure in the measuring container, repeat the measurement of the pressure in the measuring container 235 U characteristic gamma ray count rate, every time the pressure decreases by 5 Torr, the measurement time increases by 50 seconds; the measurement data is fitted to obtain the background. In the specific implementation, the intermittent measurement mode is adopted, and the background measurement is carried out once at two points every day.

[0068] The embodiment of the present application provides a method for real-time monitoring of product abundance in a uranium enrichment plant, which eliminates the dependence of product abundance monitoring on operators. Operators are only required to use a mass spectrometer for sampling and analysis when performing calibration coefficient correction. Background measurement ensures the accuracy of abundance measurement, greatly reduces the amount of operation by operators, and reduces operation and maintenance costs. The automation level of abundance measurement in uranium enrichment plants is improved, and it has a certain design basis and guiding significance for new uranium enrichment production modules.

[0069] Based on the method for real-time monitoring of product abundance of a uranium enrichment plant provided in the above embodiment, the embodiment of the present application further provides a device for real-time monitoring of product abundance of a uranium enrichment plant.

[0070] The embodiment of the present application provides a real-time monitoring device for product abundance of a uranium enrichment plant, comprising:

[0071] A first acquisition module is used to pass the UF6 gas to be measured into a measurement container and obtain the total gamma ray count rate in the measurement container using a NaI detector;

[0072] A second acquisition module is used to obtain the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration factor, and the pressure and temperature in the measurement container;

[0073] A third acquisition module is used to measure the counting rate of the characteristic gamma rays in the measurement container at different pressures using a NaI detector to obtain multiple counting rates; the lower the pressure, the longer the measurement time of the NaI detector;

[0074] The background acquisition module is used to fit the gamma ray counting rate corresponding to zero pressure according to the obtained multiple counting rates and corresponding pressures to obtain the background.

[0075] In one example, the second acquisition module is specifically used to:

[0076] The abundance E of the UF6 gas is calculated using the following formula:

[0077]

[0078] Where K is the known scale factor, S is the total count rate, and S b is the background, T is the temperature in the measurement container, and P is the pressure in the measurement container.

[0079] The embodiment of the present application provides a real-time monitoring device for product abundance in a uranium enrichment plant, which eliminates the dependence of product abundance monitoring on operators. Operators are only required to use a mass spectrometer for sampling and analysis when performing calibration coefficient correction. The background measurement ensures the accuracy of abundance measurement, greatly reduces the amount of operation by operators, and reduces operation and maintenance costs. The automation level of abundance measurement in uranium enrichment plants is improved, and it has a certain design basis and guiding significance for new uranium enrichment production modules.

[0080] Based on the method and device for real-time monitoring of product abundance of a uranium enrichment plant provided in the above embodiment, the embodiment of the present application further provides a system for real-time monitoring of product abundance of a uranium enrichment plant, which is applied to any one of the methods for real-time monitoring of product abundance of a uranium enrichment plant provided in the above embodiment.

[0081] See also Figure 2 , which is a structural schematic diagram of a real-time monitoring system for product abundance of a uranium enrichment plant provided in an embodiment of the present application.

[0082] The embodiment of the present application provides a real-time monitoring system for product abundance of a uranium enrichment plant, comprising: a measuring container 1, a NaI detector 2, a temperature sensor 3 and a pressure sensor 4;

[0083] The inlet and outlet of the measuring container 1 are connected to the front and rear ends of the concentrate flow booster through an inlet pipeline and an outlet pipeline respectively; the inlet pipeline and the outlet pipeline are connected in series with a solenoid valve 5 for controlling the pressure;

[0084] The NaI detector 2 is disposed at the measuring container 1 and is used to obtain the gamma ray counting rate in the measuring container 1;

[0085] The temperature sensor 3 and the pressure sensor 4 are both connected to the measuring container 1 and are used to measure the temperature and pressure of the measuring container 1 .

[0086] It is understandable that the measuring container 1 has two pipeline interfaces, which are connected to the front and rear of the fine material flow booster in the process system. The measuring container 1 needs to work under the condition that the inlet and outlet pressure difference is greater than 0.7 kPa. At present, the pressure difference before and after the fine material flow booster in the process system is about 3 Torr, so the fine material flow line needs to be modified. A copper pipe is connected to the inlet and outlet of the device on the free valves before and after the booster. The pressure after the booster is controlled at about 38 Torr by the electric regulating valve of the fine material flow. The inlet pressure of the booster is ensured to be about 4 Torr by adjusting the frequency of the booster, so as to ensure that the working pressure difference of the measuring container 1 is met.

[0087] In the specific implementation, in order to realize remote monitoring, the communication system of the system needs to be modified. The computer communicates with the gas mass spectrometer, temperature sensor 3, and pressure sensor 4 through the signal line, and then calculates the received data to obtain the abundance data and stores it in the database. The computer signal is transmitted to the on-site optical fiber switch through the network cable, and then transmitted to the optical fiber switch in the control room by the optical fiber and connected to the control room computer to ensure that the control room computer can remotely access the on-site device computer database.

[0088] In one example, the system further includes: a shielding shell 6;

[0089] The shielding shell 6 is sleeved on the outer sides of the measuring container 1 and the NaI detector 2 .

[0090] The embodiment of the present application provides a real-time monitoring system for product abundance in a uranium enrichment plant, which eliminates the dependence of product abundance monitoring on operators. Operators are only required to use a mass spectrometer for sampling and analysis when correcting the calibration coefficient. The background measurement ensures the accuracy of abundance measurement, greatly reduces the amount of operation by operators, and reduces operation and maintenance costs. The automation level of abundance measurement in uranium enrichment plants is improved, and it has a certain design basis and guiding significance for new uranium enrichment production modules.

[0091] Based on the method, device and system for real-time monitoring of the abundance of products in a uranium enrichment plant provided in the above embodiments, the embodiments of the present application further provide an electronic device, including a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, any one of the methods for real-time monitoring of the abundance of products in a uranium enrichment plant provided in the above embodiments is executed.

[0092] Based on the method, device and system for real-time monitoring of product abundance of a uranium enrichment plant provided in the above embodiments, the embodiments of the present application further provide a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, any one of the methods for real-time monitoring of product abundance of a uranium enrichment plant provided in the above embodiments is executed.

[0093] The present application is described in detail above in conjunction with the accompanying drawings and embodiments, but the present application is not limited to the above embodiments, and various changes can be made within the knowledge of ordinary technicians in the field without departing from the purpose of the present application. Any content not described in detail in the present application can adopt the existing technology.

Claims

1. A method for real-time monitoring of product abundance in a uranium enrichment plant, characterized in that: The method comprises: Passing the UF6 gas to be measured into a measuring container, and obtaining the total gamma-ray count rate in the measuring container using a NaI detector; Obtaining the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration factor, and the pressure and temperature in the measuring container; Wherein, the background is determined by the following steps: Using a NaI detector to measure the counting rate of characteristic gamma rays in the measuring container at different pressures to obtain a plurality of counting rates; the lower the pressure, the longer the measuring time of the NaI detector; The background is obtained by fitting the gamma ray counting rate corresponding to the pressure of zero according to the obtained multiple counting rates and the corresponding pressures.

2. The method for real-time monitoring of product abundance in a uranium enrichment plant according to claim 1, characterized in that: The lower the pressure, the longer the measurement time of the NaI detector, which specifically includes: For every 5 Torr decrease in pressure, the measurement time is extended by 50 seconds.

3. The method for real-time monitoring of product abundance in a uranium enrichment plant according to claim 1, characterized in that: The lower the pressure, the longer the measurement time of the NaI detector, which specifically includes: For every 5 Torr decrease in pressure, the measurement time is extended by 30 seconds.

4. The method for real-time monitoring of product abundance in a uranium enrichment plant according to any one of claims 1 to 3, characterized in that: The step of obtaining the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration coefficient, and the pressure and temperature in the measuring container specifically includes: The abundance E of the UF6 gas is calculated using the following formula: Where K is the known scale factor, S is the total count rate, and S b is the background, T is the temperature in the measurement container, and P is the pressure in the measurement container.

5. A real-time monitoring device for product abundance of a uranium enrichment plant, characterized in that: The device comprises: A first acquisition module is used to pass the UF6 gas to be measured into a measurement container and obtain the total gamma ray count rate in the measurement container using a NaI detector; A second acquisition module is used to obtain the abundance of the UF6 gas according to the pre-obtained background, the total count rate, the calibration factor, and the pressure and temperature in the measurement container; A third acquisition module is used to measure the counting rate of the characteristic gamma rays in the measurement container at different pressures using a NaI detector to obtain multiple counting rates; the lower the pressure, the longer the measurement time of the NaI detector; The background acquisition module is used to fit the gamma ray counting rate corresponding to zero pressure according to the obtained multiple counting rates and corresponding pressures to obtain the background.

6. The device for real-time monitoring of product abundance in a uranium enrichment plant according to claim 5, characterized in that: The second acquisition module is specifically used for: The abundance E of the UF6 gas is calculated using the following formula: Where K is the known scale factor, S is the total count rate, and S b is the background, T is the temperature in the measurement container, and P is the pressure in the measurement container.

7. A real-time monitoring system for product abundance of a uranium enrichment plant, characterized in that: A method for real-time monitoring of product abundance in a uranium enrichment plant as claimed in any one of claims 1 to 4; the system comprising: a measuring container (1), a NaI detector (2), a temperature sensor (3) and a pressure sensor (4); The inlet and outlet of the measuring container (1) are connected to the front and rear ends of the concentrate flow booster through an inlet pipeline and an outlet pipeline respectively; the inlet pipeline and the outlet pipeline are connected in series with a solenoid valve (5) for controlling the pressure; The NaI detector (2) is arranged at the measuring container (1) and is used to obtain the gamma ray counting rate in the measuring container (1); The temperature sensor (3) and the pressure sensor (4) are both connected to the measuring container (1) and are used to measure the temperature and pressure of the measuring container (1).

8. The real-time monitoring system for product abundance of a uranium enrichment plant according to claim 7, characterized in that: The system further comprises: a shielding shell (6); The shielding shell (6) is sleeved on the outer sides of the measuring container (1) and the NaI detector (2).

9. An electronic device, characterized in that: The method comprises a processor and a memory, wherein the memory stores computer-readable instructions. When the computer-readable instructions are executed by the processor, a method for real-time monitoring of product abundance in a uranium enrichment plant as claimed in any one of claims 1 to 4 is executed.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by the processor, the method for real-time monitoring of product abundance in a uranium enrichment plant as claimed in any one of claims 1 to 4 is executed.

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