An automatic control system for simulating leakage disposal experiment of uranium hexafluoride

Abstract

The application provides a uranium hexafluoride leakage disposal experiment simulation automatic control system, which comprises a control system and a leakage release system, a purification treatment system, a monitoring system, a heating system, a refrigeration system and a ventilation system electrically connected with the control system. The uranium hexafluoride leakage disposal experiment simulation system designed by the application can realize automatic control. Through the cooperative work among the control system and the leakage release system, the purification treatment system, the monitoring system, the heating system, the refrigeration system and the ventilation system electrically connected with the control system, the leakage simulation and the analysis and treatment of data can be realized. Through the whole system provided by the application, researchers can effectively master the decomposition condition of the hydrolysis product after leakage, and the purification treatment can be completed, so that the researchers' bodies are not harmed.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of nuclear fuel cycle accident simulation, in particular to a uranium hexafluoride leakage disposal experimental simulation automatic control system. BACKGROUND

[0002] The uranium hexafluoride is a white solid powder at normal temperature and pressure, but it can sublimate at 56.4℃. The uranium hexafluoride is a colorless smog gas with a pungent odor, which is highly toxic and corrosive, and can cause serious harm to the skin and respiratory tract. It is also a radioactive substance that can cause damage to human cells after entering the human body, leading to acute radiation sickness and even cancer. The uranium hexafluoride is an important chemical used in the nuclear industry, which may leak through equipment failure, operational errors or natural disasters. Once leaked, it will cause serious pollution to the surrounding environment and may cause serious harm to workers and surrounding residents. Therefore, a laboratory simulation system is needed to study the hydrolysis products of uranium hexafluoride leakage and its impact, and to master the situation after leakage through experimental data analysis, so as to facilitate the specification of detailed risk warning programs. SUMMARY

[0003] The present application provides a uranium hexafluoride leakage disposal experimental simulation automatic control system to simulate the disposal of uranium hexafluoride leakage and analyze the hydrolysis products after leakage and process and accumulate data.

[0004] Specifically, the present application provides a uranium hexafluoride leakage disposal experimental simulation automatic control system, which comprises a control system, and a leakage release system, a purification treatment system, a monitoring system, a heating system, a refrigeration system and a ventilation system electrically connected thereto.

[0005] The leakage release system comprises a uranium hexafluoride storage container, a transfer container, a sampling device, a detection device, and a pouring and purging module, a release pipeline purging module, a sampling purging module, an automatic pouring module and a release sampling module. The pouring and purging module is used to remove gas impurities in the pipeline and container before pouring. The pipeline purging module is used to remove gas impurities in the pipeline before release and to remove release gas in the pipeline after the experiment. The sampling purging module is used to remove gas impurities in the sampling device before release. The automatic pouring module is used to automatically control the conversion of solid uranium hexafluoride to gaseous uranium hexafluoride. The release sampling module is used to link the release process of uranium hexafluoride with the sampling process, so that the release and sampling of uranium hexafluoride are synchronized.

[0006] The purification treatment system comprises a tail gas treatment module, a tail gas recovery module, a waste liquid treatment module and a waste liquid evaporation module.

[0007] The heating system is used for heating control of pipelines, storage containers and transfer containers in the release system, and is used for heating control of pipelines in the tail gas treatment module.

[0008] The refrigeration system is used for refrigeration control of the first and second condensers of the tail gas recovery module.

[0009] The monitoring system is used for online monitoring and display of monitoring parameters, including monitoring of hydrogen fluoride concentration value in the detection device, monitoring of mass m value of the transfer container, monitoring of pressure value in the transfer container, monitoring of release pipeline temperature value, monitoring of heating temperature value of the heating system, monitoring of liquid level height value and PH value in the treatment tank of the tail gas treatment module, monitoring of temperature value and pressure value in the first and second condensers of the tail gas recovery module, monitoring of liquid level height value and PH value in the waste liquid treatment module, monitoring of temperature value of the heater and evaporator in the waste liquid evaporation module, and monitoring of wind pressure value and flow rate value in the ventilation system.

[0010] The control system is used for automatic control of opening and closing of electromagnetic valves of the reverse feeding and purging module, the release pipeline purging module, the sampling purging module, the automatic reverse feeding module and the release sampling module, automatic control of operation of the circulating pump of the tail gas treatment module, automatic control of operation of the circulating pump of the waste liquid treatment module, and automatic control of opening and closing of electromagnetic valves of the ventilation system.

[0011] As a preferred technical solution, the control electromagnetic valve of the automatic reverse feeding module is started when the mass m0 value of the transfer container is less than 10g, and is stopped when the mass m of the transfer container is greater than 100g. t

[0012] As a preferred technical solution, the control electromagnetic valve of the release sampling module is started when the pressure value in the transfer container is greater than P0 and the temperature value in the release pipeline is greater than T0, the values of P0 and T0 are preset values, and the preset values are stored in the control system.

[0013] As a preferred technical solution, the control electromagnetic valve of the release sampling module is stopped when the release time is greater than t0 and the release volume is greater than V0, the values of t0 and V0 are preset values, and the preset values are stored in the control system.

[0014] As a preferred technical solution, the heating system includes heating devices arranged in the hexafluoride uranium storage container and the transfer container, heating devices arranged in the reverse feeding pipeline and the release pipeline, and heating devices arranged in the tail gas treatment pipeline.

[0015] ​As a preferred technical scheme, the temperature of the heating device arranged in the uranium hexafluoride storage container and the transfer container is set to-20-100 DEG C, the temperature of the heating device arranged in the pouring pipeline and the releasing pipeline is set to 60-100 DEG C, and the temperature of the heating device arranged in the tail gas treatment pipeline is set to 60-100 DEG C.

[0016] As a preferred technical scheme, the uranium hexafluoride storage container and the transfer container, the pouring pipeline and the releasing pipeline and the tail gas treatment pipeline are provided with multiple temperature measuring elements, the temperature measuring elements are electrically connected with the control system, and the temperature measured by the temperature measuring elements is output to the control system in real time.

[0017] As a preferred technical scheme, the liquid level height value in the treatment tank in the tail gas treatment module is set to 0.1 m-1.2 m, and the PH value is set to 8-12.

[0018] As a preferred technical scheme, the temperature value in the first-stage condenser and the second-stage condenser in the tail gas recovery module is set to-40-20 DEG C, and the pressure value is set to-100-500 kPa.

[0019] As a preferred technical scheme, the local control module is further included, which is used for realizing remote control of the leakage releasing system, the purification treatment system, the monitoring system, the heating system, the refrigeration system and the ventilation system and switching of experimental device buttons, so as to realize multiple control modes.

[0020] The uranium hexafluoride leakage disposal experimental simulation system designed in the application can realize automatic control, realizes leakage simulation and data analysis and processing through the cooperative work between the control system and the leakage releasing system, the purification treatment system, the monitoring system, the heating system, the refrigeration system and the ventilation system electrically connected with the control system, effectively helps researchers to master the decomposition of the hydrolysis product after leakage, and completes purification treatment, and does not cause danger to the researchers.

[0021] Other features and advantages of the present application will be described in the following description, and some will become apparent from the description, or will be understood through implementation of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 A uranium hexafluoride leakage disposal experimental simulation automatic control structure schematic diagram is provided for the embodiment of the application;

[0023] Figure 2 A leakage releasing system automatic control structure schematic diagram is provided for the embodiment of the application;

[0024] Figure 3 A leakage releasing system automatic monitoring structure schematic diagram is provided for the embodiment of the application;

[0025] Figure 4 Automatic control structure schematic diagram of heating system for the embodiment of the present application;

[0026] Figure 5 Automatic control structure schematic diagram of tail gas treatment module for the embodiment of the present application;

[0027] Figure 6 Automatic control structure schematic diagram of tail gas recovery module for the embodiment of the present application;

[0028] Figure 7 Automatic control structure schematic diagram of waste liquid treatment module for the embodiment of the present application;

[0029] Figure 8 Automatic control structure schematic diagram of waste liquid evaporation module for the embodiment of the present application;

[0030] Figure 9 Automatic control structure schematic diagram of ventilation system for the embodiment of the present application;

[0031] Figure 10 Automatic control structure schematic diagram of monitoring system online monitoring display for the embodiment of the present application.

[0032] Explanation of reference signs:

[0033] Control system 1; leakage release system 2; purification treatment system 3; monitoring system 4; heating system 5; refrigeration system 6; ventilation system 7. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the present application clearer, the technical scheme of the present application will be described clearly and completely below in combination with specific embodiments of the present application and corresponding drawings. In the description of the present application, it should be noted that the term "or" is generally used in the sense of including "and / or" unless the context clearly indicates otherwise.

[0035] It should be understood that each of the steps recited in the method embodiments of the present application can be executed in different orders and / or in parallel. In addition, the method embodiments can include additional steps and / or omit the execution of the steps shown. The scope of the present application is not limited in this respect.

[0036] The term "comprising" and variations thereof used in the present application are open-ended, that is, "including but not limited to". The term "based on" is "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". Related definitions of other terms will be given in the description below.

[0037] It should be noted that the modification of "one", "a plurality of" mentioned in the present application is illustrative but not restrictive, and those skilled in the art should understand that unless otherwise explicitly indicated in the context, it should be understood as "one or more". "A plurality" should be understood as two or more.

[0038] Examples

[0039] As Figure 1 shown, an automatic control system 1 for a uranium hexafluoride leakage disposal experiment is proposed in the present embodiment, and specifically, the system includes a control system 1, and a leakage release system 2, a purification treatment system 3, a monitoring system 4, a heating system 5, a refrigeration system 6 and a ventilation system 7 electrically connected thereto. The main purpose of the system is to study the hydrolysis product of uranium hexafluoride leakage and its influence.

[0040] As Figures 2-3 shown, the leakage release system 2 includes a uranium hexafluoride storage container, a transfer container, a sampling device, a detection device, and a pouring and purging module, a release pipeline purging module, a sampling purging module, an automatic pouring module and a release sampling module.

[0041] The function of the pouring and purging module is to remove gas impurities in the pipeline and container before pouring. The automatic starting condition of the pouring and purging module is that the mass m0 of the transfer container is less than 10g, and the stopping condition is that the purging time is greater than t0, and the preset value of t0 is 100s. The function of the release pipeline purging module is to remove gas impurities in the pipeline before release and to remove release gas in the pipeline after the experiment. The starting condition of the release pipeline purging module is that the sampling release is completed, and the stopping condition is that the purging time is greater than t0, and the preset value of t0 is 100s.

[0042] The function of the sampling purging module is to remove gas impurities in the sampling device before release. The starting condition of the sampling purging module is that the sampling release is completed, and the stopping condition is that the single click is stopped.

[0043] The function of the automatic pouring module is to realize the automatic control of the conversion of solid uranium hexafluoride into gaseous uranium hexafluoride. The opening condition of the control electromagnetic valve of the automatic pouring module is that the mass m0 of the transfer container is less than 10g, and the stopping condition is that the mass m t of the transfer container is greater than 100g.

[0044] The function of the releasing and sampling module is to link the releasing process of the uranium hexafluoride with the sampling process, so as to realize the synchronization of the releasing and sampling of the uranium hexafluoride. The starting condition of the electromagnetic valve of the releasing and sampling module is that the pressure value in the transfer container is greater than P0, and the temperature value in the releasing pipeline is greater than T0, wherein P0 and T0 are preset values, which are 200 Kpa and 120 DEG C respectively, and the preset values are stored in the control system 1. The stopping condition of the electromagnetic valve of the releasing and sampling module is that the releasing time is greater than t0, and the releasing volume is greater than V0, wherein t0 and V0 are preset values, which are 10 s and 10 L respectively, and the preset values are stored in the control system 1.

[0045] The purification treatment system 3 comprises a tail gas treatment module, a tail gas recovery module, a waste liquid treatment module and a waste liquid evaporation module.

[0046] As shown in Figure 5 and Figure 9 , the tail gas treatment module is connected to the sampling device and the detection device, i.e. the tail gas treatment module is connected to the monitoring chamber, and the monitoring chamber is connected to the tail gas treatment module through a pipeline. The tail gas treatment module comprises a circulating pump, a circulating tank and a tail gas treatment tank. The module monitors the liquid level and the PH value, and reaches the tail gas treatment standard through the pipeline and the ventilation system 7 to be discharged into the environment. The liquid level value in the tail gas treatment tank in the tail gas treatment module is set to 0.1 m-1.2 m, and the PH value is set to 8-12. The opening and closing of the circulating pump are automatically controlled through the liquid level monitoring and the PH value monitoring. When the solution PH is less than 8, the water pump is opened to supplement the leaching solution. When the liquid level h is less than 0.1 m, the water pump is closed, the circulating tank water supplement pump is opened, and the new leaching solution is supplemented. When the liquid level h is greater than 1.2 m, the water supplement pump is closed.

[0047] As shown in Figure 4 , the heating system 5 is used for heating control of the pipelines, the storage containers and the transfer containers in the leakage releasing system 2, and is used for heating control of the pipelines in the tail gas treatment module. The heating control parameters comprise the temperature of the uranium hexafluoride storage container heating system 5, the temperature of the releasing pipeline heating system 5 and the temperature of the tail gas treatment module heating system 5. Preferably, the temperature of the heating device arranged in the uranium hexafluoride storage container and the transfer container is set to-20-100 DEG C, the temperature of the heating device arranged in the pouring pipeline and the releasing pipeline is set to 60-100 DEG C, and the temperature of the heating device arranged in the tail gas treatment pipeline is set to 60-100 DEG C.

[0048] The heating system 5 includes heating devices installed on the uranium hexafluoride storage container and transfer container, heating devices installed on the pouring pipeline and release pipeline, and heating devices installed on the tail gas treatment pipeline. Preferably, the heating device installed on the outside of the uranium hexafluoride storage container can be a metal heating element made of existing materials, and the metal heating element can be designed to fully or partially enclose the outside of the uranium hexafluoride storage container, i.e., the tank body. The heating devices installed on the pouring pipeline and release pipeline, and the heating devices installed on the tail gas treatment pipeline, can be designed as metal heating elements extending along the pipeline's direction, and can be designed to fully or partially enclose the pipeline, depending on actual needs and without limitation.

[0049] Preferably, the uranium hexafluoride storage container and transfer container, the pouring pipeline and the release pipeline, and the tail gas treatment pipeline are equipped with multiple temperature measuring elements. The temperature measuring elements are electrically connected to the control system 1 and are used to output the measured temperature to the control system 1 in real time.

[0050] The heating system 5 can gradually heat the solid uranium hexafluoride at room temperature, converting it into a gaseous state and producing hydrogen fluoride hydrolysis products. Researchers can monitor the data to study the changes in hydrogen fluoride concentration with temperature and analyze the changing trends of hydrolysis products.

[0051] like Figure 6 As shown, the refrigeration system 6 is used to control the refrigeration of the primary and secondary condensers of the exhaust gas recovery module. Preferably, the temperature values ​​of the primary and secondary condensers in the exhaust gas recovery module are set to -40 to 20°C, and the pressure values ​​are set to -100 to 500 kPa.

[0052] like Figure 7 As shown, the waste liquid discharged from the detection and sampling devices enters the waste liquid treatment module. The waste liquid is treated and precipitated by polyaluminum chloride (PAC), also known as basic aluminum chloride or hydroxyaluminum chloride, and polyacrylamide (PAM), commonly known as flocculant or coagulant. Preferably, the liquid level and pH value in the precipitation device are monitored online, and the liquid level is controlled at 0.1m to 2m and the pH value is controlled at 5 to 7.

[0053] like Figure 8 As shown, after sedimentation in the waste liquid treatment module, the waste liquid enters the waste liquid evaporation module for further treatment, becoming solid waste and ensuring no environmental pollution. The waste liquid flows from the sedimentation unit through pipelines to the heater for heating, then to the evaporator for further treatment, and finally to the filter press system, ultimately becoming solid waste. The automatic control module primarily monitors the temperatures of the heater and evaporator, controlling the temperature between 20℃ and 150℃.

[0054] like Figure 10As shown, the monitoring system 4 is used for online monitoring and displaying the monitoring parameters, including monitoring the hydrogen fluoride concentration value in the detection device, monitoring the mass m value of the transfer container, monitoring the pressure value in the transfer container, monitoring the release pipeline temperature value, monitoring the heating temperature value of the heating system 5, monitoring the liquid level height value and PH value in the treatment tank in the tail gas treatment module, monitoring the temperature value and pressure value in the primary condenser and secondary condenser in the tail gas recovery module, monitoring the liquid level height value and PH value in the waste liquid treatment module, monitoring the temperature value of the heater and evaporator in the waste liquid evaporation module, monitoring the wind pressure value and flow rate value in the ventilation system 7, and monitoring the numerical value change of other values.

[0055] The monitoring system 4 includes a detection layer and a user management layer. The detection layer is the bottom layer of the monitoring automatic control system, including a plurality of temperature detection, liquid level detection, pressure detection, mass detection, PH value detection, wind speed detection, flow detection and other detection sensing devices. The user management layer is mainly for monitoring the experimental process, collecting and processing data, and outputting and printing the experimental results. The data collection and processing mainly selects and saves the monitoring parameters such as flow, flow, liquid level height, mass, hydrogen fluoride concentration, humidity, pressure difference and relative pressure.

[0056] The control system 1 is used for automatically controlling the opening and closing of the electromagnetic valves of the reverse pouring and purging module, the release pipeline purging module, the sampling purging module, the automatic pouring module and the release sampling module; for automatically controlling the operation of the circulating pump of the tail gas treatment module; for automatically controlling the operation of the circulating pump in the waste liquid treatment module; for automatically controlling the opening and closing of the fan electromagnetic valve in the ventilation system 7.

[0057] Preferably, a local control module is further included for realizing remote control of the leakage release system 2, the purification treatment system 3, the monitoring system 4, the heating system 5, the refrigeration system 6 and the ventilation system 7 and switching of the experimental device buttons, so as to achieve the purpose of multiple control modes.

[0058] Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

Claims

1. An automatic control system for simulating uranium hexafluoride leak disposal experiments, characterized in that, include: Control system, and leakage release system, purification system, monitoring system, heating system, refrigeration system and ventilation system electrically connected thereto; The leakage release system includes a uranium hexafluoride storage container, a transfer container, a sampling device, a detection device, and a pouring and purging module, a release pipeline purging module, a sampling and purging module, an automatic pouring module, and a release sampling module. The pouring and purging module removes gaseous impurities from the pipeline and container before pouring. The pipeline purging module removes gaseous impurities from the pipeline before release and clears the released gas from the pipeline after the experiment. The sampling and purging module removes gaseous impurities from the sampling device before release. The automatic pouring module automatically controls the conversion of solid uranium hexafluoride into gaseous uranium hexafluoride. The release sampling module links the uranium hexafluoride release process with the sampling process, enabling simultaneous release and sampling. The purification system includes an exhaust gas treatment module, an exhaust gas recovery module, a waste liquid treatment module, and a waste liquid evaporation module. The heating system is used to control the heating of the pipelines, storage containers, and transfer containers in the leakage release system; and to control the heating of the pipelines in the exhaust gas treatment module. The refrigeration system is used to control the refrigeration of the primary and secondary condensers of the exhaust gas recovery module. The monitoring system is used to monitor and display monitoring parameters online, including monitoring the hydrogen fluoride concentration in the detection device, monitoring the mass m value of the transfer container, the pressure value inside the transfer container, the temperature value of the release pipeline, monitoring the heating temperature value of the heating system, monitoring the liquid level and pH value in the treatment tank of the exhaust gas treatment module, monitoring the temperature and pressure values ​​in the primary and secondary condensers of the exhaust gas recovery module, monitoring the liquid level and pH value in the waste liquid treatment module, monitoring the temperature values ​​of the heater and evaporator in the waste liquid evaporation module, and monitoring the wind pressure and flow rate values ​​in the ventilation system. The control system is used to automatically control the opening and closing of the solenoid valves of the material pouring and purging module, the release pipeline purging module, the sampling and purging module, the automatic material pouring module, and the release sampling module; to automatically control the operation of the circulating pump in the exhaust gas treatment module; to automatically control the operation of the circulating pump in the waste liquid treatment module; and to automatically control the opening and closing of the fan solenoid valve in the ventilation system.

2. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 1, characterized in that, The automatic discharging module's control solenoid valve opens when the mass m0 of the transfer container is less than 10g, and stops when the mass m of the transfer container is less than 10g. t >100g.

3. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 1, characterized in that, The activation conditions for the control solenoid valve of the release sampling module are that the pressure value in the transfer container is greater than P0 and the temperature value in the release pipeline is greater than T0. The values ​​of P0 and T0 are preset values, which are 200 kPa and 120 °C, respectively, and the preset values ​​are stored in the control system.

4. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 3, characterized in that, The solenoid valve of the release sampling module stops under the following conditions: release time > t0, release volume > V0. The values ​​of t0 and V0 are preset values, which are 10s and 10L respectively and are stored in the control system.

5. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 1, characterized in that, The heating system includes a heating device installed in the uranium hexafluoride storage container and the transfer container, a heating device installed in the discharge pipeline and the release pipeline, and a heating device installed in the exhaust gas treatment pipeline.

6. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 5, characterized in that, The temperature of the heating device installed in the uranium hexafluoride storage container and the transfer container is set to -20 to 100°C, the temperature of the heating device installed in the discharge pipeline and the release pipeline is set to 60 to 100°C, and the temperature of the heating device installed in the tail gas treatment pipeline is set to 60 to 100°C.

7. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 6, characterized in that, The uranium hexafluoride storage container and transfer container, the pouring pipeline and release pipeline, and the tail gas treatment pipeline are equipped with multiple temperature measuring elements. The temperature measuring elements are electrically connected to the control system and are used to output the measured temperature to the control system in real time.

8. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 1, characterized in that, The liquid level in the treatment tank of the exhaust gas treatment module is set to 0.1m to 1.2m, and the pH value is set to 8 to 12.

9. The automatic control system for simulating uranium hexafluoride leak disposal experiments according to claim 1, characterized in that, The temperature values ​​in the primary and secondary condensers of the exhaust gas recovery module are set to -40 to 20°C, and the pressure values ​​are set to -100 to 500 kPa.

10. An automatic control system for simulating uranium hexafluoride leak disposal experiments according to any one of claims 1-9, characterized in that, It also includes a local control module for remote control of the leakage release system, purification system, monitoring system, heating system, refrigeration system and ventilation system, as well as switching of experimental device buttons, to achieve multiple control modes.

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