Supercritical water dry-burning prevention device

Abstract

The invention discloses an intelligent supercritical water dry burning prevention device. A working section in a supercritical water system is electrically heated, and when a water inlet pipeline is disconnected and blocked, water flow in the pipeline is insufficient, so that a preheating section and the working section of a supercritical water device are overheated, and an electric heating pipe is burnt out. According to the dry-burning prevention device, timely adjustment can be conducted according to the water level in the pipeline, when the water level probe detects the water level change, the control circuit conducts intervention, the circuit automatically controls the preheating section and the working section to stop heating, the alarm circuit works, and an alarm signal is sent out; meanwhile, the water level information is sent to the mobile phone APP and the AI algorithm middle table, the water level is monitored and analyzed, and the working state of the heating circuit is controlled through multiple insurance of the mobile phone APP and the AI algorithm middle table. The system can perform intelligent monitoring analysis and remote control, is safe and simple, is simple to operate, is high in reliability, improves the stability of a supercritical system, facilitates the normal operation of supercritical water circulation, and guarantees the safety of the device.

Description

Technical Field

[0001] The invention relates to the technical field of energy and mechanical equipment, and in particular to a supercritical water drying prevention device. Background Art

[0002] Energy is the material basis of human activities. In a sense, the development of human society is inseparable from the emergence of high-quality energy and the use of advanced energy technology. In today's world, energy development, energy and the environment are issues of common concern to the world and all mankind, and are also important issues in my country's social and economic development.

[0003] Thermal power generation is the main power generation method in my country. As one of the three main equipment of thermal power plants, power plant boilers have the most significant energy-saving and environmental improvement effects. Supercritical boiler technology is the most advanced coal-fired power generation technology in the world, with the characteristics of low coal consumption, good environmental performance and high technical content. The thermal efficiency of a single supercritical unit can reach up to 50%. The power generation efficiency of ultra-supercritical units is about 10% higher than that of subcritical units, which are mainly used in my country recently, and 6% to 8% higher than that of supercritical units. If supercritical units also use low nitrogen oxide technology, the formation of nitrogen oxides and other harmful substances can be reduced by 65% ​​during the combustion process, and the desulfurization rate can exceed 98%, which can achieve the purpose of energy saving, consumption reduction and environmental protection. Nuclear power has also been valued and welcomed by countries around the world with its unique advantages, among which the reactor is the key design of nuclear power plants. The supercritical water-cooled reactor is the only water-cooled reactor among the six fourth-generation reactors selected internationally. It is widely believed internationally that it has the advantages of high thermal efficiency, compact system, simplified system, good economy, modular design, etc. It can achieve high power output in a small volume, and the equipment shows very good potential economy.

[0004] Compared with the currently operating conventional pressurized water reactors, the supercritical water-cooled reactor uses a direct circulation system similar to that of a boiling water reactor. The fluid in one loop directly enters the steam turbine to perform work, without the need for a steam generator and a pressurizer, which reduces one loop. Compared with conventional boiling water reactors, supercritical water is a single-phase fluid, and since there is no phase change, the steam-water separator and the internal circulation pump are omitted. For supercritical water-cooled reactors, the heat carrying capacity and flow stability of the natural circulation of the coolant in the event of a loss of flow accident are very important for the safety analysis of the reactor and for reducing the probability of core meltdown.

[0005] At present, the research on supercritical water natural circulation at home and abroad is in its infancy. India's Bhabha Atomic Research Center uses two heaters, two condensers, and the inner diameter of the working section is 13.8mm. It uses 44 calibrated K-type thermocouples to measure the inlet and outlet temperatures of the fluid, heating surface, and secondary side fluid. Cheng Xu of Shanghai Jiaotong University uses a closed water loop. The operating conditions of the device cover the thermal parameter range of pressurized water reactors and supercritical water-cooled reactors, taking into account both natural circulation and forced circulation; the supercritical natural circulation test loop built by Yu Jiyang of Tsinghua University is built for my country's 973 project "Basic Research on Key Scientific Issues of Supercritical Water Reactors", and its natural circulation loop is similar to the Bhabha Atomic Research Center; China Nuclear Power Research and Design Institute has built a dual-channel workbench, including several parts such as electric heating and cooling system, working section, preheating section, mass flow rate supply and regulation system; the team of Zhou Tao, the applicant of the present invention, also built a supercritical water natural circulation experimental bench for supercritical water reactors.

[0006] In the above-mentioned devices related to supercritical boilers, ultra-supercritical boilers, supercritical water-cooled reactors, etc., the working sections in the supercritical water system are all electrically heated. Although some protection devices have been installed, the overheating protection functions for changes in water level conditions in the pipeline, preheating sections and working sections are not perfect; furthermore, they cannot meet the intelligent needs of monitoring and analysis, remote control, and mobile portable operation, so it is easy to be dangerous. Especially when the water inlet pipeline is disconnected or blocked, and the water flow in the pipeline is insufficient, the preheating section and working section of the above-mentioned supercritical water device will overheat, causing the electric heating tube to burn out. If the danger is not discovered in time, the situation will continue to deteriorate, causing a short circuit, electric shock and fire accidents.

[0007] Artificial intelligence (AI) is a discipline that studies the use of computers to simulate certain human thought processes and intelligent behaviors such as learning, reasoning, thinking, and planning. It mainly includes the principles of computer intelligence and the manufacture of computers similar to human brain intelligence, so that computers can achieve higher-level applications. Applying AI technology to supercritical water reactors is one of the most promising research directions at present.

[0008] Therefore, it is necessary to design an intelligent supercritical water anti-burning device to solve the above problems. Summary of the invention

[0009] The purpose of the present invention is to propose a supercritical water anti-burning device to solve the problems in the prior art such as the change of water level in the pipeline, the imperfect overheating protection function of the preheating section and the working section, which may cause the electric heating tube to burn out and the inability to remotely control the working state of the system.

[0010] The technical solution of the present invention is a supercritical water drying prevention device, comprising a preheating section, a working section, a cooling section, a pressure stabilizing section, a water supply section and a control circuit which are sequentially connected through a main pipeline to form a closed loop;

[0011] The water supply section injects water into the main pipeline, and the water flows counterclockwise along the main pipeline, passing through the preheating section, the working section and the cooling section in sequence, and connecting in sequence to form a closed loop;

[0012] The preheating section is used to preheat the water in the main pipeline to reach a predetermined temperature;

[0013] The working section is used to continue heating the water in the main pipeline to reach the working temperature;

[0014] The cooling section is used to cool the water in the main pipeline, so that the supercritical water can circulate naturally in the main pipeline due to the temperature difference;

[0015] The pressure stabilization section is used to adjust / stabilize the pressure in the closed loop;

[0016] A water level probe is installed in the main pipeline to detect the water level in the pipeline;

[0017] The control circuit includes a water level detection circuit, a heating circuit, an alarm circuit and a relay J1; the alarm circuit includes an alarm device and a protective resistor R1;

[0018] The water level detection circuit is used to detect the output signal of the water level probe and feed it back to the heating circuit or the alarm circuit; the normally open switch of relay J1 is connected in series with the heating circuit and the power supply to form a loop; the normally closed switch of relay J1 is connected in series with the alarm and the power supply to form a closed loop; when the liquid level is lower than the water level probe, the normally open switch of relay J1 is disconnected, that is, the heating circuit is disconnected, and the heating circuit stops heating the liquid; at the same time, the normally closed switch closes the alarm circuit and the alarm warning light of the alarm device flashes.

[0019] Furthermore, the water level probe is installed in the main pipeline between the preheating section and the pressure stabilizing section and is connected to the control circuit to detect water level changes in the main pipeline.

[0020] Furthermore, a pressure-sensitive sensor is provided in the water level probe to convert pressure changes into electrical signals; the water level probe is arranged near the upper end of the pipeline, close to the upper wall of the pipeline.

[0021] Furthermore, the water level probe is arranged at the topmost end of the inner wall of the pipeline.

[0022] Further, the water level detection circuit includes a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a transistor B1 and a transistor B2;

[0023] The input end of the water level detection circuit is connected to the water level probe, and the output end of the water level detection circuit is connected to the relay control device;

[0024] Further, the alarm device includes an alarm, a warning light and a wireless Bluetooth module;

[0025] When the liquid level is lower than the water level probe, the normally closed switch of relay J is closed, the alarm circuit is turned on, the alarm sounds, the warning light flashes, and the alarm information and water level information are sent to the mobile phone APP through the wireless Bluetooth module; the alarm device is connected to the relay control device.

[0026] Furthermore, the control circuit also includes a rectifier circuit and a monitoring and analysis circuit;

[0027] The rectifier circuit includes a rectifier bridge and a voltage-stabilizing capacitor C1. The rectifier circuit converts the AC power transmitted through the transformer into a unidirectional pulse DC power and transmits it to the water level detection circuit;

[0028] The monitoring and analysis circuit includes a data acquisition module DAQ and an AI algorithm middle platform. The input end of the data acquisition module DAQ is connected to the water level probe, and the output end of the data acquisition module DAQ is connected to the relay control device; the AI ​​algorithm middle platform is connected to the power supply and the data acquisition module DAQ.

[0029] Furthermore, the AI ​​algorithm deploys the RNN recurrent neural network algorithm for intelligent analysis of the supercritical water circulation system.

[0030] Furthermore, the relay control device is installed beside the relay J1; an electromagnet is installed inside the relay control device for controlling the working state of the relay.

[0031] Compared with the prior art, the present invention has the following beneficial technical effects:

[0032] The supercritical water dry-burning prevention device provided by the present invention can control the on-off state of the relay according to the liquid level position in the pipeline, and then control the working state of the supercritical water circulation. When the liquid level position is higher than the water level probe, the normally open switch of the relay is closed and the heating circuit is connected, so that the preheating section and the working section work normally to heat the liquid; when the liquid level position is lower than the water level probe, the normally open switch of the relay is disconnected, the alarm circuit is turned on, the alarm sounds, and at the same time the heating circuit is disconnected, the heating circuit stops working, stops heating the liquid, and transmits the water level information to the AI ​​algorithm middle station through the data acquisition module DAQ for monitoring and analysis. The neural network algorithm deployed in the AI ​​algorithm middle station can predict future water level fluctuations based on the existing water level data collected by the data acquisition module DAQ; at the same time, the working state of the heating circuit can be controlled through a variety of methods such as control circuit, mobile phone APP, AI algorithm, etc., thereby eliminating safety hazards.

[0033] The supercritical water dry-out prevention device provided by the present invention has a simple control circuit structure and is easy to use. When the water flow is insufficient due to other reasons such as the water inlet pipe being blocked or disconnected, that is, when the liquid level in the main pipeline is lower than the water level probe, the heating is automatically stopped and an alarm is sounded, realizing a dry-out prevention strategy for a variety of control relay control devices including circuit control, wireless Bluetooth mobile terminal control, and AI algorithm middle station control, avoiding potential safety hazards caused by human operation, preventing circuit burnout and short circuit due to overheating, causing electric shock and fire accidents, protecting personal and property safety, and achieving the purpose of dry-out prevention. It can also be used for various heating appliances and any other occasions. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The overall structure schematic diagram of the supercritical water natural circulation device of the present invention is shown;

[0035] Figure 2 The intelligent control circuit of the supercritical water anti-burning device of the present invention is shown.

[0036] Figure numerals: 1. main pipeline; 2. preheating section; 3. working section; 4. cooling section; 5. voltage stabilizing section; 6. water supply section; 61. plunger pump; 7. water level probe; 8. water level detection circuit; 9. heating circuit; 10. alarm circuit; 101. alarm device; 102. wireless Bluetooth module; 11. rectifier circuit; 111. rectifier bridge; 12. power supply; 13. monitoring and analysis circuit; 14. data acquisition module DAQ; 15. AI algorithm middle platform; 16. relay control device. DETAILED DESCRIPTION

[0037] The present invention will be further described in detail below through the accompanying drawings and embodiments. Through these descriptions, the characteristics and advantages of the present invention will become more clear and distinct.

[0038] The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration." Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. Although various aspects of the embodiments are shown in the drawings, the drawings are not necessarily drawn to scale unless otherwise noted.

[0039] Example 1

[0040] According to the present invention, an intelligent supercritical water drying prevention device is provided, such as Figure 1 and Figure 2 The device comprises a preheating section 2, a working section 3, a cooling section 4, a pressure stabilizing section 5 and a water supply section 6 which are sequentially connected through a main pipeline 1 to form a closed loop. Figure 1In the device, water is injected into the main pipeline 1 from the water supply section 6, and the water can flow counterclockwise along the main pipeline, and sequentially flow through the preheating section 2, the working section 3 and the cooling section 4, which are connected in sequence to form a closed loop.

[0041] Among them, the main pipeline 1 is a hollow closed pipeline, the preheating section 2 is used to preheat the water in the main pipeline to reach a predetermined temperature, the working section 3 is used to continue heating the water and reach the working temperature, so as to observe the various performance parameters of the deionized water after becoming supercritical water through instruments and meters, and the cooling section 4 is used to cool the supercritical water, and finally make the supercritical water flow naturally in the main pipeline to form a natural circulation; the pressure stabilizing section 5 is used to stabilize the pressure in the main pipeline to keep it within a predetermined range, and the water supply section 6 is used to inject water into the main pipeline.

[0042] The pressure stabilizing section 5 includes a pressure stabilizing tank. Preferably, the pressure stabilizing tank is airtight and connected to the main pipeline through a pressure stabilizing conduit. The pressure stabilizing section 5 controls the pressure in the main pipeline through the pressure stabilizing tank.

[0043] The water supply section 6 includes a water tank, a filter, a plunger pump 61 and a stop valve. The plunger pump 61 is started to inject water in the water tank into the main pipeline 1 so that the water fills the entire closed loop, and then the stop valve and the plunger pump 61 are closed.

[0044] According to the present invention, the device further comprises a water level probe 7 for detecting the liquid level position in the main pipeline 1. Figure 1 As shown in FIG. , the water level probe 7 is installed in the main pipeline 1 between the water supply section 6 and the preheating section 2, so that the liquid level position can be detected to avoid dry burning.

[0045] Although some protective devices are installed in the working section of the current supercritical water system, there are no corresponding protective facilities for the water level changes in the pipeline, and it is not possible to accurately, timely and sensitively reflect the insufficient water flow in the pipeline caused by reasons such as disconnection and blockage of the water pipeline, so it is easy to cause dangers, such as dry burning, which leads to the burning of the electric heating tube; the situation worsens and causes a short circuit in the circuit, causing electric shock and fire accidents; especially for the supercritical state of the present invention, when the water flow is insufficient and the water level drops, air appears in the pipeline, which does not meet the working conditions of the natural circulation of supercritical water. For this reason, according to a preferred embodiment of the present invention, the water level probe 7 is arranged near the upper part of the pipeline, near the upper wall of the pipeline, and preferably the water level probe 7 is arranged at the top of the inner wall of the pipeline.

[0046] Placing the water level probe at the top can ensure that the liquid fills the entire pipeline, prevents the presence of air, and provides ideal supercritical working conditions. In this way, when a closed loop fails, it can be discovered and handled immediately. For example, when a leak occurs, there is enough time to handle the process when the liquid level drops from the top to the middle, preventing danger before it happens. On the contrary, if the probe is placed in the middle or bottom, there is already a serious lack of water. By the time it is discovered and handled, the instrument may have been damaged, causing a series of dangers.

[0047] In the present invention, in order to install a device that can sense the liquid level position in the main pipeline on the water level probe 7, preferably a pressure-sensitive sensor, in order to ensure that the water level probe 7 works normally in the main pipeline 1, the water level probe 7 needs to be insulated and waterproofed.

[0048] The device provided by the present invention also includes a control circuit connected to the water level probe 7, such as Figure 2 As shown, the control circuit includes a heating circuit 9, the heating circuit 9 includes a parallel circuit for heating the preheating section 2 and the working section 3, and the heating circuit 9 is connected to a power source 12. Under normal circumstances, after the power is turned on, the heating circuit 9 works normally, so that the preheating section and the working section heat the water at the same time.

[0049] In the present invention, the heating circuit 9 further includes a relay J1, which has two gears: a normally open switch and a normally closed switch. One end of the relay J1 is connected to one end of the power supply 12, and the normally open switch of the relay J1 is connected to the preheating section 2 and the working section 3. Thus, the power supply 12, the heating circuit 9 and the relay J1 form a closed loop. When the power supply 12 is turned on, the heating circuit 9 works normally when the normally open switch of the relay J1 is closed (i.e., the normally closed switch is disconnected).

[0050] In addition, the control circuit also includes an alarm circuit 10, and the alarm circuit 10 includes an alarm. Preferably, the alarm includes a speaker, a warning light and a wireless Bluetooth module. Preferably, the alarm circuit also includes a protective resistor R1, one end of the protective resistor R1 is connected to the power supply, the other end of the protective resistor R1 is connected to one end of the alarm, and the other end of the alarm is connected to the normally closed switch of the relay J1, whereby the power supply, the relay, the alarm and the resistor form a closed loop. When the power supply 12 is turned on, when the normally closed switch of the relay J1 is closed (i.e., the normally open switch is disconnected), the alarm works, sends an alarm signal, and sends the alarm information and the water level information to the mobile phone APP in real time through the wireless Bluetooth module, and remotely controls the heating state of the system through the mobile phone APP while monitoring the water level, meeting the portability requirements of mobile users.

[0051] The present invention adopts relay J1 as a switching element to control the connection and disconnection of alarm circuit 10 and heating circuit 9, and utilizes the switching function of relay J1, when heating circuit 9 is working, alarm circuit 10 is disconnected, and when alarm circuit 10 is working, heating circuit 9 is disconnected.

[0052] The control circuit also includes a rectifier circuit 11. The rectifier circuit 11 includes a rectifier bridge 111 and a capacitor C1. In the present application, the power supply 12 is connected to the input end of the rectifier circuit 11 through a transformer. After the power supply 12 is turned on, the voltage is stepped down by the transformer, and a low-voltage alternating current is input to the rectifier circuit 11. The alternating current is converted into a unidirectional pulse direct current through the rectifier bridge 111. The capacitor C1 is connected in parallel with the rectifier bridge 111 to stabilize the voltage.

[0053] The control circuit also includes a monitoring and analysis circuit 13, one end of which is connected to the protective resistor R2 behind the water level probe 7, and the other end is connected to the power supply 12. When the water level changes, the water level probe 7 converts the pressure signal into an electrical signal and transmits it to the data acquisition module DAQ14. The data acquisition module DAQ14 processes the electrical signal and transmits it to the AI ​​algorithm middle station 15. The algorithm middle station deploys the RNN recurrent neural network algorithm for the supercritical water circulation system. First, according to the existing water level data collected by the data acquisition module DAQ, the data includes a timestamp and a corresponding water level value, the data is normalized, and the data is divided into time windows, each window contains historical data of multiple time steps, which is used to predict the water level of the next time step; secondly, the RNN cycle is used for modeling, and the water level information is input into the model for training to evaluate the accuracy of the model; finally, the model is optimized by hyperparameter tuning, data enhancement, regularization and other methods. Finally, the purpose of predicting future water level fluctuations and monitoring and analyzing the water level is achieved.

[0054] The controller also includes a water level detection circuit 8. The output end of the rectifier circuit 11 is connected to the water level detection circuit 8. The water level probe 7 is connected to the water level detection circuit 8, and the water level detection circuit 8 is connected to the heating circuit 9 and the alarm circuit 10 through the relay J1.

[0055] The water level detection circuit 8 comprises a relay J1, and a normally open switch of the relay J1 forms a series circuit with a heating circuit 9 and a power supply 12. A normally closed switch of the relay J1 forms a series circuit with an alarm circuit 10.

[0056] The water level detection circuit 8 also includes resistors R2, R3, R4, R5 and transistors B1 and B2. The water level probe 7 is connected to the base of the transistor B1 through the protective resistor R2. The transistor B1 is connected in series with the transistor B2. R3 and R4 are connected in series and then in parallel with the voltage-stabilizing capacitor C1. One end of the voltage-stabilizing capacitor is connected to the emitter of the transistor B2. The other end of the voltage-stabilizing capacitor C1 is connected to the collector of the transistor B1 through the resistor R5 and then grounded. The collector of the transistor B2 is connected to the relay and then connected to the other end of the capacitor and grounded. The resistors R2, R3, R4, R5 play the role of voltage division and current limiting.

[0057] After the power supply 12 is turned on, the alternating current provided by the power supply 12 passes through the transformer and is output as an alternating current with a lower voltage to supply the rectifier bridge 111 in the rectifier circuit 11. The alternating current is converted into a unidirectional pulsating direct current by the rectifier bridge 111 and connected to the upper and lower sides of the resistors R3 and R4. When the water level in the main pipeline 1 is higher than the water level probe 7, the water level probe 7 converts the water pressure signal into an electrical signal, and the water level probe 7 forms a voltage difference with the transistor B1, so that the base of the transistor B1 has a shunt voltage, so that the transistor B1 is turned on, and then the transistor B2 is turned on, and then the relay J1 is turned on, and the normally open switch of the relay J1 is pulled in, and the preheating section 2 and the working section 3 form a closed loop with the power supply, and the preheating section 2 and the working section 3 start to operate to heat the water. By detecting the position state of the liquid level in the main pipeline, the heating of the preheating section 2 and the working section 3 is controlled, thereby ensuring the normal operation of the supercritical water natural circulation system.

[0058] When the water level in the main pipeline 1 is lower than the water level probe 7 due to disconnection or blockage of the waterway, the water level probe 7 cannot transmit an electrical signal, and the base of the transistor B1 cannot obtain the shunt voltage, so that the transistor B1 and the transistor B2 cannot be turned on, and therefore the relay J1 cannot be turned on, and the normally open switch of the relay J1 is disconnected, so that the preheating section 2 and the working section 3 are disconnected from the power supply, and the heating stops to prevent dry burning. At the same time, the normally closed switch of the relay J1 forms a closed loop with the power supply 12 and the alarm circuit 10, and the alarm starts to work and sounds. The staff handles it in time, thereby eliminating the potential safety hazards in time and ensuring the safety of people's lives and property.

[0059] The present invention also includes a relay control device 16, which mainly relies on the electromagnet installed therein to control the working state of the relay J1. One end of the device is connected to the alarm device, and the other end is connected to the output end of the data acquisition module DAQ. When the control circuit fails and cannot normally control the opening and closing of the relay, the working state of the relay J1 can be changed by using a mobile phone APP or an AI algorithm middle station, using a magnetic suction mode to ensure that the heating circuit stops running and ensure the safety of the system.

[0060] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A supercritical water drying prevention device, characterized in that: It comprises a preheating section (2), a working section (3), a cooling section (4), a pressure stabilizing section (5), a water supply section (6) and a control circuit which are sequentially connected through a main pipeline (1) to form a closed loop; The water supply section (6) injects water into the main pipeline (1), and the water flows counterclockwise along the main pipeline (1), sequentially passing through the preheating section (2), the working section (3) and the cooling section (4), and are sequentially connected to form a closed loop; The preheating section (2) is used to preheat the water in the main pipeline (1) to a predetermined temperature; The working section (3) is used to continue heating the water in the main pipeline (1) to reach the working temperature; The cooling section (4) is used to cool the water in the main pipeline (1), so that the supercritical water circulates naturally in the main pipeline (1) due to the temperature difference. The pressure stabilizing section (5) is used to adjust / stabilize the pressure in the closed loop; A water level probe (7) is provided in the main pipeline (1) for detecting the water level in the pipeline; The control circuit comprises a water level detection circuit (8), a heating circuit (9), an alarm circuit (10) and a relay J1; the alarm circuit (10) comprises an alarm device (101) and a protective resistor R1; The water level detection circuit (8) is used to detect the output signal of the water level probe (7) and feed it back to the heating circuit (9) or the alarm circuit (10); the normally open switch of the relay J1 is connected in series with the heating circuit (9) and the power supply (12) to form a loop; the normally closed switch of the relay J1 is connected in series with the alarm and the power supply (12) to form a closed loop; when the liquid level is lower than the water level probe (7), the normally open switch of the relay J1 is disconnected, that is, the heating circuit (9) is disconnected, and the heating circuit (9) stops heating the liquid; at the same time, the normally closed switch is closed, the alarm circuit (10) is turned on, and the alarm warning light of the alarm device (101) flashes.

2. The supercritical water drying prevention device according to claim 1, characterized in that: The water level probe (7) is installed in the main pipeline (1) between the preheating section (2) and the pressure stabilizing section (5), and is connected to the control circuit to detect water level changes in the main pipeline (1).

3. The supercritical water drying prevention device according to claim 2, characterized in that: A pressure-sensitive sensor is arranged in the water level probe (7) to convert pressure changes into electrical signals; the water level probe (7) is arranged near the upper end of the pipeline and near the upper wall of the pipeline.

4. The supercritical water drying prevention device according to claim 3, characterized in that: The water level probe (7) is arranged at the topmost end of the inner wall of the pipeline.

5. The supercritical water drying prevention device according to claim 1, characterized in that: The water level detection circuit (8) comprises a resistor R2, a resistor R3, a resistor R4, a resistor R5 and a transistor B1 and a transistor B2; The input end of the water level detection circuit (8) is connected to the water level probe (7), and the output end of the water level detection circuit (8) is connected to the relay control device (16).

6. The supercritical water drying prevention device according to claim 1, characterized in that: The alarm device (101) comprises an alarm, a warning light and a wireless Bluetooth module (102); When the liquid level is lower than the water level probe (7), the normally closed switch of the relay J1 is closed, the alarm circuit (10) is turned on, the alarm sounds, the warning light flashes, and the alarm information and the water level information are sent to the mobile phone APP through the wireless Bluetooth module (102); the alarm device (101) is connected to the relay control device (16).

7. The supercritical water drying prevention device according to claim 1, characterized in that: The control circuit also includes a rectifier circuit (11) and a monitoring and analysis circuit (13); The rectifier circuit (11) comprises a rectifier bridge (111) and a voltage-stabilizing capacitor C1. The rectifier circuit (11) converts the alternating current transmitted through the transformer into unidirectional pulse direct current, and transmits the unidirectional pulse direct current to the water level detection circuit (8). The monitoring and analysis circuit (13) comprises a data acquisition module DAQ (14) and an AI algorithm platform (15); the input end of the data acquisition module DAQ (14) is connected to a water level probe (7), and the output end of the data acquisition module DAQ (14) is connected to a relay control device (16); the AI ​​algorithm platform (15) is connected to a power supply (12) and the data acquisition module DAQ (14).

8. The supercritical water drying prevention device according to claim 7, characterized in that: The AI ​​algorithm center (15) deploys an RNN recurrent neural network algorithm for intelligent analysis of the supercritical water circulation system.

9. The supercritical water drying prevention device according to claim 5, characterized in that: The relay control device (16) is installed beside the relay J1; an electromagnet is installed inside the relay control device for controlling the working state of the relay.

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