A lead-based fast reactor electrically powered solid oxygen control system

Abstract

This invention discloses a lead-based fast reactor control technology for nuclear power plants, specifically a electrically powered solid oxygen control and regulation system for a lead-based fast reactor, comprising: a liquid lead-bismuth flow pipeline, a solid oxygen source replenishment device, and a liquid level control system. The liquid lead-bismuth flow pipeline includes: a loop inflow pipeline, a loop pipeline expansion bend, a vertical pipeline dissolution chamber, a loop outflow pipeline, a charging tank isolation chamber, and an electric valve. The solid oxygen source replenishment device includes: a motor, a fixed flange, a screw sleeve, a threaded connection structure, a screw, ribs, an upper orifice plate of the charging tank, a charging tank, a lower orifice plate of the charging tank, a locking hole on the upper orifice plate of the charging tank, alumina spheres, lead oxide ceramic spheres, and a charging tank isolation chamber. The liquid lead-bismuth in the liquid lead-bismuth flow pipeline sequentially passes through the loop inflow pipeline, the loop pipeline expansion bend, and the vertical pipeline dissolution chamber, then exchanges oxygen ions with the charging tank before entering the downstream system through the loop outflow pipeline, thus achieving solid oxygen control and oxygen ion exchange.

Description

Technical Field

[0001] This invention belongs to the field of nuclear power plant lead-based fast reactor control technology, and specifically relates to an electric solid oxygen control and regulation system for lead-based fast reactors. Background Technology

[0002] Lead-bismuth alloys offer unique advantages for lead-based cooled reactors. For example, their high boiling point effectively increases the reactor coolant outlet temperature, improving economic efficiency. Furthermore, lead-bismuth alloys exhibit minimal volume change during in-reactor temperature variations, minimizing material damage. Additionally, the system can operate at atmospheric pressure with lead-bismuth alloys as the coolant, reducing pressure requirements on materials and ensuring system safety. However, during the operation of lead-based cooled reactors, the dissolution and corrosion of structural materials and piping by the lead-bismuth alloy can occur, severely impacting the safe operation of the reactor.

[0003] Currently, the main solutions to corrosion problems are surface coating protection and oxygen concentration control within the circuit. Surface coating protection protects the material through surface coating technology or surface alloying; oxygen concentration control within the circuit involves regulating the oxygen concentration in the operating circuit to generate an oxide film that inhibits the corrosion rate. Under reactor operating conditions, the oxygen concentration in the circuit has certain requirements. Too low an oxygen concentration will lead to dissolution corrosion of the metal materials, while too high an oxygen concentration will cause the precipitation of metal oxides, causing pipe blockage. Therefore, it is necessary to dynamically adjust the oxygen concentration in the circuit to keep it within the operating range where the oxide film can be stably formed. Solid-state oxygen control is one such method. By adjusting the dissolution rate of solid lead oxide ceramic microspheres, it rapidly oxygenates the liquid lead-bismuth system, offering multiple advantages such as high efficiency, speed, and no residue in oxygen concentration regulation.

[0004] Existing technologies include solid-state oxygen control to adjust the oxygen concentration in the circuit. For example, Chinese patent document CN115331847A, entitled "A Liquid Lead-Bismuth Solid-State Oxygen Control Ion Exchanger," discloses a liquid lead-bismuth solid-state oxygen control ion exchanger, comprising a main circuit pipeline, a bypass pipeline, an electric valve, a heater, a vertical pipeline, an isolation chamber and a charging chamber, a slide bar, a fixed flange, a sealing flange, a charging tank, and lead oxide ceramic balls. This solution controls the dissolution rate of the lead oxide ceramic balls by adjusting the flow rate of the liquid lead-bismuth fluid in the bypass pipeline and the temperature of the liquid lead-bismuth in the charging chamber, thereby achieving solid-state oxygen control. However, because not all of the liquid lead-bismuth fluid participates in oxygen ion exchange, and manual adjustment of the slide bar is required, the efficiency and accuracy of oxygen control are limited. Therefore, there is an urgent need for a lead-based fast reactor electrically driven solid-state oxygen control system that can efficiently and accurately dynamically adjust the oxygen concentration in the circuit, keeping it within the operating range where oxide film can be stably formed. Summary of the Invention

[0005] The purpose of this invention is to provide an electrically driven solid oxygen control and regulation system for a lead-based fast reactor, characterized in that it comprises:

[0006] The liquid lead-bismuth flow pipeline, the solid oxygen source replenishment device, and the liquid level control system are included. The liquid level control system includes an electric valve and a sealing flange. The outlet of the electric valve is sealed to the inlet of the isolation chamber of the loading tank of the solid oxygen source replenishment device through the sealing flange. The inlet of the electric valve is connected to the outlet of the vertical pipeline dissolution chamber of the liquid lead-bismuth flow pipeline. The vertical pipeline dissolution chamber and the loading tank isolation chamber are installed perpendicular to the horizontal plane.

[0007] The liquid lead-bismuth flow pipeline includes: a loop inlet pipe, a loop pipe sudden expansion bend, a vertical pipe dissolution chamber, and a loop outlet pipe; wherein the loop inlet pipe, the loop pipe sudden expansion bend, and the vertical pipe dissolution chamber are connected in sequence, the loop inlet pipe is connected to the inlet of the liquid lead-bismuth, and the loop outlet pipe is installed on the side wall of the outlet side of the vertical pipe dissolution chamber, and the loop outlet pipe is connected to the downstream system.

[0008] A heating wire for controlling the temperature of liquid lead bismuth is installed on the outside of the side wall of the inlet side of the vertical pipe dissolution chamber.

[0009] The solid oxygen source replenishment device includes: a motor, a motor fixing flange, a screw sleeve, a threaded connection structure, a screw, a loading hopper, alumina spheres, lead oxide ceramic spheres, and a loading hopper isolation chamber; the motor is sealed and fixed to one end face of the motor fixing flange, and the other end face of the motor fixing flange is sealed and fixed to the loading hopper isolation chamber through the isolation chamber flange; the power output shaft of the motor is fixedly connected to the screw sleeve; the screw sleeve is fixed to the threaded connection structure, and the threaded connection structure is threadedly engaged with the screw; the loading hopper is installed at the lower end of the screw, and the rotation of the motor drives the screw and the loading hopper to rise and fall.

[0010] The inlet side wall of the isolation chamber of the filling barrel is equipped with fins for heat dissipation.

[0011] The alumina and lead oxide ceramic balls form a ball bed inside the filling barrel. The filling barrel includes a barrel wall, an upper perforated plate, and a lower perforated plate. The upper and lower perforated plates are fixedly installed on the outer side of the upper and lower end faces of the barrel wall, respectively. The upper and lower perforated plates are filter plates with 4mm openings, used to fix the ball bed inside the filling barrel.

[0012] This invention also discloses a solid oxygen control method for the electro-pneumatic solid oxygen control system of the lead-based fast reactor, characterized in that the oxygen ion concentration sensor of the electro-pneumatic solid oxygen control system monitors the oxygen ion concentration in the liquid lead-bismuth flow pipe in real time; including the following steps:

[0013] Liquid lead and bismuth sequentially enter the inflow pipe of the loop, the sudden expansion bend of the loop pipe, and the dissolution chamber of the vertical pipe before flowing into the downstream system through the outflow pipe of the loop.

[0014] The screw driven by the motor moves the loading barrel into the loading barrel isolation chamber, and the electric valve closes, isolating the loading barrel from the liquid lead and bismuth.

[0015] When the oxygen ion concentration in the liquid lead-bismuth flow channel is less than the first preset concentration:

[0016] Turn on the heating wire to heat the liquid lead-bismuth in the vertical pipe melting chamber;

[0017] Adjust the opening of the electric valve, and the motor drives the screw to insert the loading bucket into the vertical pipe dissolution chamber of the liquid lead-bismuth flow pipeline;

[0018] The heated liquid lead-bismuth flows through the vertical pipe dissolution chamber, dissolving the lead oxide ceramic balls in the loading tank. The lead oxide then enters the downstream liquid lead-bismuth system, realizing solid-state oxygen-controlled oxygen ion exchange of liquid lead-bismuth.

[0019] When the oxygen ion concentration in the liquid lead-bismuth flow channel is greater than the second preset concentration:

[0020] The motor drives the screw, moving the filling barrel upwards to the filling barrel isolation chamber. The electric valve closes, isolating the filling barrel from the liquid lead and bismuth.

[0021] The beneficial effects of this invention are as follows:

[0022] This invention discloses an electrically powered solid-state oxygen control system for a lead-based fast reactor. Based on the principle of solid-state oxygen control, it replenishes oxygen ions by dissolving lead oxide ceramic microspheres, dynamically adjusting the oxygen concentration in the loop to maintain it within the operating range where the oxide film can be stably formed. This prevents the dissolution and corrosion of structural materials or pipelines by lead-bismuth alloys, ensuring the safe operation of the reactor. The system is highly efficient and rapid, simple to operate, has low maintenance costs, and a fast response time. It can quickly control the oxygen concentration in the lead-bismuth loop, and automatically adjusts to isolate the solid oxygen source from the liquid lead-bismuth fluid after oxygen replenishment, effectively preventing environmental contamination of the liquid lead-bismuth system and ensuring long-term stable and safe operation of the loop. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of an electrically driven solid oxygen control and regulation system for a lead-based fast reactor according to the present invention;

[0024] Figure 2 This is a schematic diagram of an electrically driven solid oxygen control system for a lead-based fast reactor according to the present invention.

[0025] Figure 3 This is a schematic diagram of the solid oxygen source replenishment component of an electrically driven solid oxygen control and regulation system for a lead-based fast reactor according to the present invention.

[0026] Among them: 1-motor, 2-motor fixing flange, 3-screw sleeve, 4-threaded connection structure, 5-screw, 6-filling bucket, 7-isolation chamber flange, 8-filling bucket isolation chamber, 9-rib, 10-sealing flange, 12-electric valve, 13-circuit outflow pipe, 14-heating wire, 15-circuit pipe sudden expansion bend, 16-circuit inflow pipe, 17-vertical pipe dissolution chamber, 18-filling bucket upper orifice plate, 19-alumina balls, 20-filling bucket lower orifice plate, 21-lead oxide ceramic balls. Detailed Implementation

[0027] This invention provides an electrically driven solid oxygen control system for a lead-based fast reactor. The invention will be further described in detail below with reference to the accompanying drawings.

[0028] like Figure 1 As shown, this invention discloses an electrically operated solid oxygen control and regulation system for a lead-based fast reactor, comprising: a liquid lead-bismuth flow pipeline, a solid oxygen source replenishment device, and a liquid level control system; wherein the liquid level control system includes an electric valve 12 and a sealing flange 10, the outlet of the electric valve 12 is sealed to the inlet of the loading tank isolation chamber 8 of the solid oxygen source replenishment device through the sealing flange 10, and the inlet of the electric valve 12 is connected to the outlet of the vertical pipeline dissolution chamber 17 of the liquid lead-bismuth flow pipeline; the vertical pipeline dissolution chamber 17 and the loading tank isolation chamber 8 are installed perpendicular to the horizontal plane;

[0029] The liquid lead-bismuth flow pipeline includes: a loop inlet pipe 16, a loop pipe sudden expansion bend 15, a vertical pipe dissolution chamber 17, and a loop outlet pipe 13; wherein the loop inlet pipe 16, the loop pipe sudden expansion bend 15, and the vertical pipe dissolution chamber 17 are connected in sequence, the loop inlet pipe 16 is connected to the inlet of the liquid lead-bismuth, and the loop outlet pipe 13 is installed on the side wall of the outlet side of the vertical pipe dissolution chamber 17, and the loop outlet pipe 13 is connected to the downstream system;

[0030] In this embodiment, the liquid lead-bismuth flow path in the liquid lead-bismuth flow pipeline is as follows: first, it enters the loop inflow pipeline 16, then the loop pipeline sudden expansion bend 15, then the vertical pipeline dissolution chamber 17, and finally flows into the loop outflow pipeline 13 to enter the downstream system.

[0031] A heating wire 14 for controlling the temperature of liquid lead bismuth is installed on the outside of the side wall of the inlet side of the vertical pipe dissolution chamber 17;

[0032] The higher the temperature of the liquid lead-bismuth flowing through the lead oxide ceramic ball 21 packed bed, the greater the dissolution rate. Therefore, the temperature of the liquid lead-bismuth can be increased by heating wire 14 to improve the oxygenation rate of the liquid lead-bismuth system.

[0033] The solid oxygen source replenishment device includes: a motor 1, a motor fixing flange 2, a screw sleeve 3, a threaded connection structure 4, a screw 5, a loading tank 6, alumina balls 19, lead oxide ceramic balls 21, and a loading tank isolation chamber 8; the motor 1 is sealed and fixed to one end face of the motor fixing flange 2, and the other end face of the motor fixing flange 2 is sealed and fixed to the loading tank isolation chamber 8 through the isolation chamber flange 7; the power output shaft of the motor 1 is fixedly connected to the screw sleeve 3; the screw sleeve 3 is fixed to the threaded connection structure 4, the threaded connection structure 4 is threadedly engaged with the screw 5, and the loading tank 6 is installed at the lower end of the screw 5; the rotation of the motor 1 drives the screw 5 and the loading tank 6 to rise and fall.

[0034] In this embodiment, the motor fixing flange 2 of the solid oxygen source replenishment device has an edge and a middle through hole, and the motor 1 is welded to the edge through hole of the motor fixing flange 2. The upper end of the screw sleeve 3 passes through the middle through hole of the motor fixing flange 2 and is connected to the motor 1. The upper end of the screw 5 is screwed into the threaded connection structure 4 and extends into the screw sleeve 3. The lower end of the screw 5 passes through the upper hole plate 18 of the material tank 6 and is welded. The rotation of the motor 1 drives the screw 5 to rise and fall.

[0035] In this embodiment, the movement of the loading tank 6 is more precisely controlled by motor 1, and the motor is connected to the terminal for automatic control. The motor drives the loading tank to rise and fall, and the reaction time of the lead oxide pellets is controlled by controlling the immersion time of the loading tank in liquid lead bismuth, thereby controlling the oxygen concentration of the liquid lead bismuth more precisely.

[0036] A heat dissipation fin 9 is installed on the outside of the side wall of the inlet side of the material filling tank isolation chamber 8;

[0037] In this embodiment, the ribs 9 are fixed to the outside of the isolation chamber 8 of the loading tank for heat dissipation. When oxygenation is performed, the loading tank 6 extends into the vertical pipe dissolution chamber 17 and is immersed in the heated fluid. After oxygenation is completed, the loading tank 6 has residual heat, which is dissipated through the ribs, thus preventing the device from being in a high temperature for a long time and effectively extending the performance and life of the device.

[0038] The alumina microspheres 19 and lead oxide ceramic microspheres 21 form a packed ball bed inside the loading tank 6. The loading tank 6 includes: a tank wall, an upper perforated plate 18 and a lower perforated plate 20. The upper perforated plate 18 and the lower perforated plate 20 are respectively fixedly installed on the upper and lower end faces of the tank wall. The upper perforated plate 18 and the lower perforated plate 20 are filter plates with 4mm openings, used to fix the packed ball bed inside the loading tank 6.

[0039] In this embodiment, the loading barrel 6 is used to fill alumina microspheres 19 and lead oxide ceramic microspheres 21. After the loading barrel 6 is filled with microspheres to form a filling ball bed, the upper perforated plate 18 of the loading barrel is locked with a nut, and the filling ball bed is fixed in the loading barrel 6 together with the lower perforated plate 20 of the loading barrel; the lead oxide ceramic microspheres 21 are the solid oxygen source of the liquid lead bismuth system.

[0040] In an optional embodiment, when filling the loading tank 6 with alumina microspheres 19 and lead oxide ceramic microspheres 21, the order should be: first fill with alumina microspheres 19, then fill with lead oxide ceramic microspheres 21, and finally fill with alumina microspheres 19 again. That is, lead oxide ceramic microspheres 21 should be in the middle position of the filling ball bed in the loading tank 6. In this embodiment, alumina microspheres 19 are insoluble in liquid lead bismuth, and the alumina ball bed acts as a filter to prevent lead oxide ceramic microspheres 21 from dissolving and becoming smaller and entering the liquid lead bismuth system.

[0041] In this embodiment, when the liquid lead-bismuth flow pipeline is installed in the liquid lead-bismuth circuit, the circuit pipeline abruptly expanded bend 15 is upstream, and the circuit outlet pipeline 13 is downstream. The vertical pipeline dissolution chamber 17 and the loading tank isolation chamber 8 are installed perpendicular to the horizontal plane. The direction of the loading tank isolation chamber 8 is consistent with the direction of gravity. The liquid lead-bismuth level is controlled by the electric valve 12 to exceed the circuit outlet pipeline 13 but not reach the loading tank isolation chamber 8. In the liquid lead-bismuth flow pipeline, the injection and recovery channels of the loading tank 6 are connected to the vertical pipeline dissolution chamber 17 via the electric valve 12 to supply oxygen ions during the liquid lead-bismuth flow.

[0042] In this embodiment, the electric valve 12 serves as the execution unit of the liquid level control system. The electric valve 12 controls the liquid lead-bismuth level flowing through the vertical pipe dissolution chamber 17 by adjusting its opening. When lead oxide ceramic balls 21 need to be dissolved, the electric valve 12 opens, and the loading tank 6 enters the vertical pipe dissolution chamber 17 for oxygen ion exchange. When the solid oxygen source replenishment device does not need to work, the electric valve 12 closes. The electric valve 12 and the sealing flange 10 work together to control the liquid lead-bismuth level to be lower than the loading tank isolation chamber 8, and all of it flows into the loop outlet pipe 13, achieving the isolation function and effectively preventing environmental pollution of the liquid lead-bismuth system.

[0043] In the solid oxygen source replenishment device, motor 1 provides power for the lifting and lowering of the loading tank. The pump body of motor 1 is cooled by forced air, which can meet the requirement of a maximum operating temperature of 450℃. The sliding rod 5 is automatically controlled to extend and retract, inserting the loading tank 6 into the vertical pipe dissolution chamber 17 of the liquid lead-bismuth flow pipeline. The oxygen ion exchange rate is controlled by controlling the time the loading tank 6 is in the vertical pipe dissolution chamber 17. When the oxygen ion exchange ends, the loading tank 6 retracts into the loading tank isolation chamber 8. The fins 9 dissipate heat from the loading tank isolation chamber 8, effectively extending the performance and lifespan of the device.

[0044] This invention also discloses a solid oxygen control method for the lead-based fast reactor electrically driven solid oxygen control system, wherein the oxygen ion concentration sensor of the lead-based fast reactor electrically driven solid oxygen control system monitors the oxygen ion concentration in the liquid lead-bismuth flow pipe in real time; the method includes the following steps:

[0045] Liquid lead-bismuth sequentially enters the inflow pipe 16 of the loop, the sudden bend pipe 15 of the loop pipe, and the dissolution chamber 17 of the vertical pipe, before flowing into the downstream system through the outflow pipe 13 of the loop.

[0046] Motor 1 drives screw 5 to move loading barrel 6 into loading barrel isolation chamber 8, electric valve 12 closes, and loading barrel 6 is isolated from liquid lead bismuth;

[0047] When the oxygen ion concentration in the liquid lead-bismuth flow channel is less than the first preset concentration:

[0048] Turn on the heating wire 14 to heat the liquid lead-bismuth in the vertical pipe melting chamber 17;

[0049] Adjust the opening of the electric valve 12, and the motor 1 drives the screw 5 to insert the loading bucket 6 into the vertical pipe dissolution chamber 17 of the liquid lead-bismuth flow pipeline;

[0050] The heated liquid lead-bismuth flows through the vertical pipe dissolution chamber 17, dissolving the lead oxide ceramic balls in the loading tank 6. The lead oxide enters the downstream liquid lead-bismuth system, realizing solid-state oxygen-controlled oxygen ion exchange of liquid lead-bismuth.

[0051] When the oxygen ion concentration in the liquid lead-bismuth flow channel is greater than the second preset concentration:

[0052] Motor 1 drives screw 5, causing the loading barrel 6 to move upward to the loading barrel isolation chamber 8, and electric valve 12 closes, isolating the loading barrel 6 from the liquid lead bismuth.

[0053] In this embodiment, the first preset concentration and the second preset concentration can be flexibly set according to specific working conditions, and no specific limitation is made here.

[0054] In this embodiment, when the solid oxygen source replenishment device is working, specifically when the oxygen ion concentration in the liquid lead-bismuth flow pipeline is less than a first preset concentration, the electric valve 12 is opened. The motor 1 drives the screw 5 to insert the loading tank 6 into the vertical dissolution chamber 17 of the liquid lead-bismuth flow pipeline. When the high-temperature liquid lead-bismuth flows through the vertical dissolution chamber 17, it dissolves the lead oxide ceramic microspheres in the loading tank 6. The lead oxide then enters the downstream liquid lead-bismuth system, achieving solid-state oxygen-controlled oxygen ion exchange. In this embodiment, because all the liquid lead-bismuth is placed in the vertical dissolution chamber, the oxygen ion exchange efficiency is improved, allowing for more accurate and direct control of the oxygen concentration.

[0055] In this embodiment, when the solid oxygen source replenishment device is not required to operate, that is, when the oxygen ion concentration in the liquid lead-bismuth flow pipeline is greater than the second preset concentration, the motor 1 drives the screw 5 to move the loading tank 6 upward to the loading tank isolation chamber 8. At this time, the loading tank 6 filled with alumina microspheres 19 and lead oxide ceramic microspheres 21 leaves the liquid lead-bismuth fluid, and the electric valve 12 closes, achieving the function of isolating the loading tank from the liquid lead-bismuth alloy. The entire process is automatically completed by the electric valve and motor drive, without the need for manual operation, effectively improving the efficiency of solid oxygen control and preventing environmental pollution of the liquid lead-bismuth system.

[0056] Figure 2 This invention discloses a schematic diagram of an electrically driven solid oxygen control system for a lead-based fast reactor, as shown below. Figure 2 As shown, the liquid lead-bismuth flowing into the bend of the solid oxygen-controlled ion exchanger has a temperature of T0 and an oxygen concentration of C0. When it flows into the ball bed, it washes over the lead oxide ceramic balls. At the same time, the heater on the outer wall of the dissolution chamber pipe heats the lead oxide and controls its dissolution. The liquid lead-bismuth fluid with a temperature of T1 and an oxygen concentration of C2 flows out of the downstream pipe of the ball bed, thereby achieving the purpose of regulating the oxygen concentration in the liquid lead-bismuth alloy.

[0057] Figure 3 This is a schematic diagram of the solid oxygen source replenishment component of an electrically driven solid oxygen control and regulation system for a lead-based fast reactor according to the present invention. Figure 3 As shown, the upper perforated plate 18 and lower perforated plate 20 of the loading barrel 6 in the solid oxygen source replenishment device are filter plates with 4mm openings, used to fix the shape of the filling ball bed in the loading barrel 6. The lead oxide ceramic balls 21 are the solid oxygen source of the liquid lead bismuth system. The lower end of the screw 5 passes through the upper perforated plate 18 of the loading barrel 6 and is welded. The upper end of the screw 5 is screwed into the threaded connection structure 4 and extends into the screw sleeve 3. The upper end of the screw sleeve 3 is connected to the motor 1. The motor 1 rotates to drive the screw 5 and control the lifting and lowering of the loading barrel 6. The ribs 9 are fixed on the outside of the loading barrel isolation cavity 8 for heat dissipation.

[0058] In summary, compared with existing solid oxygen control technologies, the lead-based fast reactor electrically driven solid oxygen control system disclosed in this invention, through the structural design of the liquid lead-bismuth flow pipeline, can inject all the liquid lead-bismuth into the vertical pipeline dissolution chamber 17, improving oxygen ion exchange efficiency and making oxygen concentration control more accurate and direct. The motor 1 drives the screw 5 to precisely and efficiently raise and lower the charging tank 6, and the reaction time of the lead oxide pellets is controlled by adjusting the immersion time of the charging tank 6 in the liquid lead-bismuth, thereby controlling the oxygen concentration of the liquid lead-bismuth more accurately and efficiently. The electric valve 12 isolates the solid oxygen source from the liquid lead-bismuth fluid, eliminating the need to open the sealing flange 10 and manually operate the screw 5, making it safer and more reliable. The charging tank isolation chamber 8 effectively prevents external environmental contamination of the liquid lead-bismuth system after oxygen control is completed. This invention automatically drives and adjusts the dissolved oxygen concentration in a liquid lead-bismuth alloy coolant system, providing a novel method for oxygen concentration control in such systems. The entire liquid lead-bismuth fluid participates in oxygen ion exchange, improving oxygen control efficiency. Automatic motor control ensures greater precision and speed compared to manual operation of the loading tank. An isolation chamber effectively prevents external environmental contamination of the liquid lead-bismuth system after oxygen control is complete. This provides support for the long-term stable and safe operation of the lead-bismuth circuit.

Claims

1. A lead-based fast reactor electrically driven solid-state oxygen control and regulation system, characterized in that, include: The liquid lead-bismuth flow pipeline, the solid oxygen source replenishment device, and the liquid level control system are included. The liquid level control system includes an electric valve (12) and a sealing flange (10). The outlet of the electric valve (12) is sealed to the inlet of the loading tank isolation chamber (8) of the solid oxygen source replenishment device through the sealing flange (10). The inlet of the electric valve (12) is connected to the outlet of the vertical pipeline dissolution chamber (17) of the liquid lead-bismuth flow pipeline. The vertical pipeline dissolution chamber (17) and the loading tank isolation chamber (8) are installed perpendicular to the horizontal plane. The liquid lead-bismuth flow pipeline includes: a loop inlet pipe (16), a loop pipe sudden expansion bend (15), a vertical pipe dissolution chamber (17), and a loop outlet pipe (13); wherein the loop inlet pipe (16), the loop pipe sudden expansion bend (15), and the vertical pipe dissolution chamber (17) are connected in sequence, the loop inlet pipe (16) is connected to the inlet of the liquid lead-bismuth, and the loop outlet pipe (13) is installed on the side wall of the outlet side of the vertical pipe dissolution chamber (17), and the loop outlet pipe (13) is connected to the downstream system; The oxygen ion concentration sensor in the lead-based fast reactor's electrically driven solid-state oxygen control system monitors the oxygen ion concentration in the liquid lead-bismuth flow channel in real time; the process includes the following steps: Liquid lead-bismuth sequentially enters the inflow pipe (16) of the loop, the sudden expansion bend pipe (15) of the loop, and the dissolution chamber (17) of the vertical pipe, and then enters the downstream system through the outflow pipe (13) of the loop; The screw (5) driven by the motor (1) moves the loading barrel (6) into the loading barrel isolation chamber (8), and the electric valve (12) closes, thus isolating the loading barrel (6) from the liquid lead and bismuth. When the oxygen ion concentration in the liquid lead-bismuth flow channel is less than the first preset concentration: Turn on the heating wire (14) to heat the liquid lead-bismuth in the vertical pipe melting chamber (17); Adjust the opening of the electric valve (12), and the screw (5) driven by the motor (1) will insert the loading bucket (6) into the vertical pipe dissolution chamber (17) of the liquid lead-bismuth flow pipeline, so that all the liquid lead-bismuth is put into the vertical pipe dissolution chamber. The heated liquid lead-bismuth flows through the vertical pipe dissolution chamber (17), dissolving the lead oxide ceramic balls in the loading tank (6). The lead oxide enters the downstream liquid lead-bismuth system, realizing the solid oxygen-controlled oxygen ion exchange of liquid lead-bismuth. When the oxygen ion concentration in the liquid lead-bismuth flow channel is greater than the second preset concentration: The motor (1) drives the screw (5) to move the loading barrel (6) upward to the loading barrel isolation chamber (8), the electric valve (12) closes, and the loading barrel (6) is isolated from the liquid lead and bismuth; the motor (1) controls the movement of the loading barrel (6), and the motor is connected to the terminal for automatic control; The electric valve (12) serves as the execution unit of the liquid level control system. The electric valve (12) controls the liquid lead-bismuth level flowing through the vertical pipe dissolution chamber (17) by adjusting the opening degree. When lead oxide ceramic balls (21) need to be dissolved, the electric valve (12) opens, and the loading tank (6) enters the vertical pipe dissolution chamber (17) for oxygen ion exchange. When the solid oxygen source replenishment device does not need to work, the electric valve (12) closes. The electric valve (12) and the sealing flange (10) work together to control the liquid lead-bismuth level to be lower than the loading tank isolation chamber (8), and all of it flows into the loop outflow pipe (13). A heating wire (14) for controlling the temperature of liquid lead bismuth is installed on the outside of the side wall of the inlet side of the vertical pipe dissolution chamber (17). The solid oxygen source replenishment device includes: a motor (1), a motor fixing flange (2), a screw sleeve (3), a threaded connection structure (4), a screw (5), a loading bucket (6), alumina balls (19), lead oxide ceramic balls (21), and a loading bucket isolation chamber (8); the motor (1) is sealed and fixed to one end face of the motor fixing flange (2), and the other end face of the motor fixing flange (2) is sealed and fixed to the loading bucket isolation chamber (8) through the isolation chamber flange (7). The power output shaft of the motor (1) is fixedly connected to the screw sleeve (3); the screw sleeve (3) is fixed to the threaded connection structure (4), and the threaded connection structure (4) is threadedly engaged with the screw (5). The loading bucket (6) is installed at the lower end of the screw (5). The screw (5) and the loading bucket (6) are raised and lowered by the rotation of the motor (1).

2. The electrically operated solid oxygen control and regulation system for lead-based fast reactor as claimed in claim 1 wherein, The inlet side wall of the material tank isolation chamber (8) is equipped with fins (9) for heat dissipation.

3. The electrically operated solid oxygen control and regulation system for lead-based fast reactor as claimed in claim 1 wherein, Alumina microspheres (19) and lead oxide ceramic microspheres (21) are filled in a filling barrel (6) to form a filling ball bed. The filling barrel (6) includes: a barrel wall, an upper filling barrel perforated plate (18) and a lower filling barrel perforated plate (20). The upper filling barrel perforated plate (18) and the lower filling barrel perforated plate (20) are respectively fixedly installed on the upper and lower end faces of the barrel wall. The upper filling barrel perforated plate (18) and the lower filling barrel perforated plate (20) are filter plates with 4 mm openings, which are used to fix the filling ball bed in the filling barrel (6).

Images