Pneumatic liquid lead bismuth solid oxygen control oxygen ion exchange device

Abstract

The utility model belongs to the technical field of fourth-generation nuclear reactor lead-based fast reactors, and particularly relates to a pneumatic liquid lead bismuth solid oxygen control oxygen ion exchange device. The exchange device comprises a gas circulation loop, a coolant container and a mass exchanger. When the steam injection loop operates, the covering inert gas is extracted and injected into the mass exchanger, the liquid level of the liquid lead bismuth drops along with the rise of the air pressure, and when the liquid level drops to the bottom of the mass exchanger, the bottom contact type liquid level meter sends out a feedback signal; when the air exhaust loop runs, inert gas in the mass exchanger is exhausted and injected back to covering inert gas of liquid lead and bismuth in the loop, and the process is repeated for periodic circulation along with reduction of the air pressure, rising of the liquid level of lead and bismuth in the mass exchanger and transmission of a feedback signal by a contact type liquid level meter at the top of the mass exchanger. The oxygen concentration increasing rate in the lead-bismuth loop is dynamically controlled along with the oxygen concentration change, and the situation that the oxygen concentration is too high, and solid oxide is generated to pollute a liquid lead-bismuth system is prevented.

Description

Technical Field

[0001] The utility model belongs to the technical field of lead-based fast reactors of the fourth generation of nuclear reactors, and particularly relates to a pneumatic liquid lead-bismuth solid oxygen control oxygen ion exchange device. Background Art

[0002] Liquid lead-bismuth alloy is considered to be one of the preferred materials for the coolant of the accelerator-driven system due to its excellent neutronics performance and good chemical and physical properties. However, liquid lead-bismuth alloy has strong corrosiveness to the directly contacted steel, and its corrosiveness is affected by the oxygen concentration. At present, one of the main solutions to corrosion is to control the oxygen concentration within a certain range, form a dense oxide layer on the surface of the iron-based metal material, and slow down the corrosion of the liquid lead-bismuth alloy on the structural material through the oxide layer. Under operating conditions, there are certain range requirements for the oxygen concentration in the loop. If the oxygen concentration is too low, dissolution corrosion of the metal material will occur, and if the oxygen concentration is too high, precipitation of metal oxides will occur, causing blockage of the pipeline.

[0003] Therefore, there is an urgent need for a convenient and accurate device to adjust the oxygen concentration in lead-bismuth and perform efficient, precise, and clean dynamic adjustment of the oxygen concentration in the liquid lead-bismuth system. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a pneumatic liquid lead-bismuth solid oxygen control oxygen ion exchange device, which is characterized by including: an air circulation loop, a coolant container, and a mass exchanger;

[0005] The air circulation loop includes: an air pump, a first electric valve, a second electric valve, a third electric valve, and a fourth electric valve; the air pump is an integrated air extraction and injection pump;

[0006] The coolant container includes: a tank body and a flange cover; the flange cover is provided with a first air pipe through hole, a second air pipe through hole, and a mass exchanger air pipe; the tank body and the flange cover form a closed space, the bottom of the closed space is filled with liquid lead-bismuth, and the rest of the closed space is filled with inert gas;

[0007] The mass exchanger includes: a metal tank body with an open top and bottom, the top of the metal tank body is fixedly connected to the flange cover; a charging cavity wall with an open top and bottom is arranged inside the metal tank body; the top of the charging cavity wall is fixedly connected to the flange cover; the charging cavity wall and the metal tank body are coaxial, and an internal space communicating with the mass exchanger air pipe is formed inside the metal tank body through the charging cavity wall; an external space is formed between the charging cavity wall and the metal tank body;

[0008] The first tracheal through-hole, the fourth electric valve, the second three-way joint, the air pump, the first three-way joint, the second electric valve, the third three-way joint, and the mass exchanger trachea are connected in series through tracheas to form an inflation circuit; the second tracheal through-hole, the first electric valve, the first three-way joint, the air pump, the second three-way joint, the third electric valve, the third three-way joint, and the mass exchanger trachea are connected in series through tracheas to form an air extraction circuit; an upper grid plate and a lower grid plate are arranged in the internal space, and the upper grid plate, the lower grid plate and the charging cavity wall jointly enclose a charging space for accommodating a plurality of lead oxide ceramic balls; the upper grid plate and the lower grid plate are respectively fixedly connected to the charging cavity wall, and air pressure balance holes are arranged on the charging cavity wall, and the air pressure balance holes are located between the upper grid plate and the flange cover; the upper contact liquid level gauge, the lower contact liquid level gauge and the oxygen sensor are hermetically passed through the flange cover through connecting ferrules and extend into the external space; the bottom of the upper contact liquid level gauge is at the same horizontal height as the upper grid plate, and is used for detecting whether the liquid lead-bismuth liquid level is higher than the upper grid plate; the bottom of the lower contact liquid level gauge is at the same horizontal height as the lower grid plate, and is used for detecting whether the liquid lead-bismuth liquid level is lower than the lower grid plate; the bottom of the oxygen sensor extends out of the bottom of the metal tank body and is used for obtaining the oxygen concentration of the liquid lead-bismuth at the bottom of the coolant container.

[0009] A cooling coil is arranged between the third three-way joint and the mass exchanger trachea.

[0010] A plurality of symmetrically distributed air pressure balance holes are arranged on the charging cavity wall.

[0011] A differential pressure sensor is arranged between the air inlet and the air outlet of the air pump, and is used for measuring the driving force provided by the gas for the change of the liquid lead-bismuth liquid level in the mass exchanger.

[0012] The lower grid plate is fixedly connected to the lower cavity wall, and threaded fixing holes are arranged at corresponding positions on the lower cavity wall and the charging cavity wall, and the lower cavity wall and the charging cavity wall are fixedly connected in a detachable manner through threads.

[0013] The materials of the tank body, the flange cover, the metal tank body and the mass exchanger trachea are lead-bismuth corrosion-resistant materials with conductivity.

[0014] The air pressure balance holes are two through holes symmetrically distributed on the charging cavity wall, the diameter of the air pressure balance holes is 3 mm, and the air pressure balance holes are located between the upper grid plate and the flange cover; the maximum flow rate of the air pump can reach 1 L / min, and a throttling device is arranged for the air pump to adjust the flow rate.

[0015] The beneficial effects of the utility model are as follows:

[0016] The utility model discloses a pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device. Based on the principle of solid-state oxygen control, the rate of liquid lead-bismuth flushing lead oxide ceramic balls is changed by injecting and pumping gas, so as to change the oxygen ion dissolution rate in the lead oxide ceramic balls, dynamically adjust the oxygen concentration in the loop, control it within the working range where the oxide film is stably formed, prevent the dissolution and corrosion of the lead-bismuth alloy to the structural materials or pipelines, ensure the safe operation of the reactor, and has the characteristics of high efficiency, rapidity, simple operation, low maintenance cost and fast response speed. It can dynamically control the oxygen concentration growth rate in the lead-bismuth loop following the change of oxygen concentration, and prevent the oxygen concentration from being too high, resulting in the generation of solid oxides to pollute the liquid lead-bismuth system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of a pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device of the utility model;

[0018] Figure 2 It is a schematic structural diagram of the mass exchanger in the utility model;

[0019] Figure 3 It is a radial sectional view of the mass exchanger structure of the utility model;

[0020] Figure 4 It is another radial sectional view of the mass exchanger structure of the utility model;

[0021] Figure 5 It is a top view schematic diagram of the flange cover of the utility model;

[0022] Figure 6 It is a bottom view schematic diagram of the flange cover of the utility model;

[0023] Wherein: 1 air pump, 2 differential pressure sensor, 3 first electric valve, 4 second electric valve, 5 third electric valve, 6 fourth electric valve, 7 cooling coil, 8 mass exchanger, 9 upper grid plate, 10 lead oxide ceramic balls, 11 lower grid plate, 12 covering inert gas, 13 liquid lead-bismuth, 14 coolant container, 15 gas circulation loop, 16 flange cover, 16-1 first air pipe through hole, 16-2 second air pipe through hole, 8-1 metal tank body, 8-3 lower end contact type liquid level gauge, 8-4 mass exchanger air pipe, 8-5 upper end contact type liquid level gauge, 8-6 oxygen sensor, 8-7 threaded fixing hole, 8-8 air pressure balance hole, 8-10 charging cavity wall, 8-11 lower cavity wall, 17-1 first three-way, 17-2 second three-way, 17-3 third three-way, 18 air pump outlet air pipe, 19 air pump inlet air pipe, 20 third air pipe. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] The present utility model provides a pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device. The following further elaborates on the present utility model in conjunction with the accompanying drawings.

[0025] To solve the problem in the background art of how to dynamically control the oxygen concentration growth rate in the lead-bismuth loop following the change in oxygen concentration, and prevent the oxygen concentration from being too high and generating solid oxides to pollute the liquid lead-bismuth system. The present utility model discloses a pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device. The inert covering gas in the coolant container is pumped out by an air pump and injected into the mass exchanger, thereby changing the air pressure of the covering gas above the liquid level in the mass exchanger. The liquid level of lead-bismuth in the mass exchanger rises or falls with the change in air pressure. By changing the rising or falling speed of the liquid level, the erosion rate of the lead-bismuth liquid on the lead oxide ceramic is changed, thereby achieving the purpose of adjusting the oxygen concentration in the liquid lead-bismuth alloy. According to the oxygen concentration in the liquid lead-bismuth system, the dissolution rate of the lead oxide ceramic balls is precisely adjusted so that the oxygen concentration of the liquid lead-bismuth alloy is within a reasonable range, achieving the purpose of effectively inhibiting the corrosion of the liquid lead-bismuth on the structural materials.

[0026] As Figure 1 shown, the embodiment of the present utility model discloses a pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device, including: an air circulation loop 15, a coolant container 14, and a mass exchanger 8;

[0027] The air circulation loop 15 includes: an air pump 1, a first electric valve 3, a second electric valve 4, a third electric valve 5, and a fourth electric valve 6; the air pump 1 is a combined air extraction and injection pump;

[0028] The coolant container 14 includes: a tank body and a flange cover 16; the flange cover 16 is provided with a first air pipe through hole 16-1, a second air pipe through hole 16-2, and a mass exchanger air pipe 8-4; the tank body and the flange cover 16 form a sealed space. The bottom of the sealed space is filled with liquid lead-bismuth 13, and the rest of the sealed space is filled with covering inert gas 12;

[0029] As Figure 2 shown, the mass exchanger 8 includes: a metal tank body 8-1 with an open top and bottom, the top of the metal tank body 8-1 is fixedly connected to the flange cover 16; an open-top and bottom loading cavity wall 8-10 is provided inside the metal tank body 8-1; the top of the loading cavity wall 8-10 is fixedly connected to the flange cover 16; the loading cavity wall 8-10 and the metal tank body 8-1 are coaxial, and an internal space communicating with the mass exchanger air pipe 8-4 is formed inside the metal tank body 8-1 through the loading cavity wall 8-10; an external space is formed between the loading cavity wall 8-10 and the metal tank body 8-1;

[0030] In this embodiment, the air pump 1 is an integrated air extraction and injection pump, which provides a gas driving force for the change of the lead-bismuth liquid level in the mass exchanger 8; the first interface of the air pump 1 is sequentially connected to the first air pipe through-hole 16-1 of the flange cover 16 in the coolant container 14 via the air pump intake air pipe 19 and the fourth electric valve 6, and the second air pipe through-hole 16-2 of the flange cover 16 is sequentially connected to the second interface of the air pump 1 via the first electric valve 3 and the air pump outlet air pipe 18; the two interfaces of the second electric valve 4 are respectively connected to the air pump outlet air pipe 18 and the third air pipe 20, and the two interfaces of the third electric valve 5 are respectively connected to the air pump intake air pipe 19 and the third air pipe 20; the third air pipe 20 is communicated with the mass exchanger air pipe 8-4 of the mass exchanger 8.

[0031] The first air pipe through-hole 16-1, the fourth electric valve 6, the second three-way joint 17-2, the air pump 1, the first three-way joint 17-1, the second electric valve 4, the third three-way joint 17-3, and the mass exchanger air pipe 8-4 are connected in series through air pipes to form an inflation circuit; the second air pipe through-hole 16-2, the first electric valve 3, the first three-way joint 17-1, the air pump 1, the second three-way joint 17-2, the third electric valve 5, the third three-way joint 17-3, and the mass exchanger air pipe 8-4 are connected in series through air pipes to form an air extraction circuit.

[0032] An upper grid plate 9 and a lower grid plate 11 are provided in the internal space, and the upper grid plate 9, the lower grid plate 11 and the charging cavity wall 8-10 jointly enclose a charging space for accommodating a number of lead oxide ceramic balls 10; the upper grid plate 9 and the lower grid plate 11 are respectively fixedly connected to the charging cavity wall 8-10, and an air pressure balance hole 8-8 is provided on the charging cavity wall 8-10, and the air pressure balance hole 8-8 is located between the upper grid plate 9 and the flange cover 16.

[0033] In this embodiment, the space between the upper grid plate 9 and the lower grid plate 11 is a charging cavity, which is filled with lead oxide ceramic balls 10 to fix the ball bed. The surfaces of the upper grid plate 9 and the lower grid plate 11 are covered with holes to ensure the smooth outflow of the liquid lead-bismuth, and at the same time filter possible fragments of the lead oxide ceramic balls 10 to prevent the fragments from flowing into the liquid lead-bismuth system.

[0034] The upper end contact type liquid level gauge 8-5, the lower end contact type liquid level gauge 8-3 and the oxygen sensor 8-6 penetrate through the flange cover 16 through connection ferrules and are sealed and extend into the external space; as Figure 4 shown, the bottom of the upper end contact type liquid level gauge 8-5 is at the same horizontal height as the upper grid plate 9, and is used to detect whether the liquid lead-bismuth liquid level is higher than the upper grid plate 9; as Figure 3 shown, the bottom of the lower end contact type liquid level gauge 8-3 is at the same horizontal height as the lower grid plate 11, and is used to detect whether the liquid lead-bismuth liquid level is lower than the lower grid plate 11; as Figure 4As shown, the bottom of the oxygen sensor 8-6 extends out of the bottom of the metal tank 8-1 to obtain the oxygen concentration of the liquid lead-bismuth at the bottom of the coolant container 14.

[0035] In this embodiment, as Figure 5 and Figure 6 shown, the mass exchanger gas pipe 8-4 is fixedly welded to the flange cover 16, and the mass exchanger gas pipe 8-4 communicates with the internal gas space of the mass exchanger 8; the connecting ferrule is fixedly welded to the flange cover (16), and a total of three connecting ferrules are provided, which are respectively used to fix the lower contact liquid level gauge 8-3, the upper contact liquid level gauge 8-5 and the oxygen sensor 8-6. The bottom of the lower contact liquid level gauge 8-3 is at the same horizontal height as the lower grid plate 11, and the upper contact liquid level gauge 8-5 is at the same horizontal height as the upper grid plate 9;

[0036] In an alternative embodiment, a cooling coil 7 is provided between the third three-way 17-3 and the mass exchanger gas pipe 8-4. In this alternative embodiment, the other ends of the second electric valve 4 and the third electric valve 5 are respectively connected to the cooling coil 7 through three-way joints; the cooling coil 7 is connected to the mass exchanger gas pipe 8-4 through a ferrule. The cooling coil 7 is provided to ensure the safe operating temperature of the air pump 1. Since the temperature of the liquid lead-bismuth alloy is relatively high, the conventional temperature is about 300°C to 500°C. When the high-temperature gas in the mass exchanger 8 is transmitted to the air pump 1 through the mass exchanger gas pipe 8-4, the temperature may exceed the tolerance temperature of the air pump 1 and the electric valve, resulting in failure of the air pump 1 and the electric valve or affecting the service life. Therefore, the cooling coil 7 is added for cooling.

[0037] A plurality of symmetrically distributed air pressure balance holes are provided on the charging cavity wall 8-10. In this embodiment, the air pressure balance holes 8-8 are on the side wall of the charging cavity wall 8-10 and are used to balance the pressure in the charging cavity and the pressure in the interlayer between the metal tank 8-1 and the charging cavity wall 8-10. In this embodiment, the air pressure balance holes 8-8 provided on the charging cavity wall 8-10 are symmetrically distributed on the wall surface of the pipeline at the top of the charging cavity wall 8-10. The porous design can make the air pressure distribution more uniform and ensure the normal operation of the contact liquid level gauge.

[0038] In an alternative embodiment, a differential pressure sensor 2 is provided between the air inlet and the air outlet of the air pump 1 to measure the driving force provided by the gas for the change of the liquid lead-bismuth liquid level in the mass exchanger 8.

[0039] In this alternative embodiment, the differential pressure sensor 2 is arranged at the inlet and outlet positions of the air pump to measure the driving force provided by the gas for the change in the liquid level of the lead-bismuth in the mass exchanger 8. Those skilled in the art should know that according to the differential pressure value obtained by the differential pressure sensor 2, the height difference between the internal and external liquid levels can be deduced to calibrate the reading of the liquid level gauge, making the height difference value of the liquid level obtained from the readings of the upper contact liquid level gauge 8-5 and the lower contact liquid level gauge 8-3 more accurate.

[0040] In an alternative embodiment, the lower grid plate 11 is fixedly connected to the lower cavity wall 8-11, and threaded fixing holes 8-7 are provided at corresponding positions on the lower cavity wall 8-11 and the charging cavity wall 8-10. The lower cavity wall 8-11 and the charging cavity wall 8-10 are detachably fixedly connected by threads.

[0041] In this alternative embodiment, the upper grid plate 9 is fixedly connected to the charging cavity wall 8-10 by welding; the lower grid plate 11 is fixedly connected to the lower cavity wall 8-11 by welding; the threaded fixing holes 8-7 are designed on the surfaces of both the charging cavity wall 8-10 and the bottom lower grid plate 11. The threaded fixing holes 8-7 are threaded through holes, and bolts are passed through the threaded fixing holes 8-7 to detachably fix the bottom lower grid plate 11, thereby more conveniently realizing the replacement of the lead oxide ceramic balls 10 in the charging space.

[0042] In an alternative embodiment, the materials of the tank body, the flange cover 16, the metal tank body 8-1, and the mass exchanger air pipe 8-4 are lead-bismuth corrosion-resistant materials with conductivity. In this alternative embodiment, the tank body, the flange cover 16, the metal tank body 8-1, and the mass exchanger air pipe 8-4 are made of 316L stainless steel with good lead-bismuth corrosion resistance.

[0043] The air pressure balance holes are two through holes symmetrically distributed on the charging cavity wall 8-10. The diameter of the air pressure balance holes is 3 mm, and they are located between the upper grid plate 9 and the flange cover 16. The flow rate of the air pump 1 can reach up to 1 L / min at most, and a throttling device is provided for the air pump 1 to adjust the flow rate.

[0044] In this embodiment, those skilled in the art should know that according to the situation of the air pressure balance holes provided on the charging cavity wall 8-10, the corresponding model of the air pump 1 is selected, and a throttling device is provided for the air pump 1 as needed to adjust the flow rate. For example, in this embodiment, the model of the air pump 1 is the C61 model pump of Hailin Technology Company, and it is required that the pump flow rate can reach up to 1 L / min at most and be equipped with a throttling device to facilitate the adjustment of the flow rate.

[0045] By using the pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device disclosed in the embodiments of the present invention, the dissolution rate of lead oxide ceramic balls can be accurately adjusted according to the oxygen concentration in the liquid lead-bismuth system, so that the oxygen concentration of the liquid lead-bismuth alloy is within a reasonable range, achieving the purpose of effectively inhibiting the corrosion of the liquid lead-bismuth to the structural material. By changing the power of the air pump 1, the scouring rate of the liquid lead-bismuth on the lead oxide ceramic balls 10 is adjusted, and the oxygen ion dissolution rate of the lead oxide ceramic balls 10 is changed, so as to achieve the purpose of adjusting the solid-state oxygen control oxygen ion exchange rate of the liquid lead-bismuth.

[0046] Another embodiment of the present invention also discloses a control system for the pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device according to the present invention, including: the pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device and a control acquisition module. The control acquisition module reads the signals of the upper contact liquid level gauge 8-5 and the lower contact liquid level gauge 8-3, controls the opening and closing of the first electric valve 3, the second electric valve 4, the third electric valve 5 and the fourth electric valve 6, realizes the switching between the gas injection and extraction modes, adjusts the liquid level height of the liquid lead-bismuth, and controls the scouring of the liquid lead-bismuth 13 on the lead oxide ceramic balls 10; the control acquisition module reads the data of the oxygen sensor 8-6, and adjusts the power of the air pump 1 according to the oxygen concentration of the liquid lead-bismuth at the bottom of the coolant container 14, realizes the control of the scouring rate of the liquid lead-bismuth on the lead oxide ceramic balls 10, and realizes the control and adjustment of the solid-state oxygen control oxygen ion exchange rate of the liquid lead-bismuth.

[0047] In an optional embodiment, a differential pressure sensor 2 is arranged between the air inlet and the air outlet of the air pump 1, which is used to measure the driving force provided by the gas for the change of the liquid level of the liquid lead-bismuth in the mass exchanger 8. The control acquisition module calculates the estimated value of the liquid level difference according to the differential pressure data obtained by the differential pressure sensor 2, and uses the estimated value of the potential difference to perform secondary verification on the measured value of the liquid level difference obtained by the upper contact liquid level gauge 8-5 and the lower contact liquid level gauge 8-3.

[0048] Those skilled in the art should know that the power supply and signal reading functions of the control acquisition module are realized based on the prior art, and are not specifically limited in this embodiment.

[0049] In this embodiment, the control acquisition module includes a control module and an acquisition module; the acquisition module is connected to the differential pressure sensor 2 and the oxygen sensor 8-6 through wires, and the acquisition module is responsible for acquiring the signals of the differential pressure sensor 2 and the oxygen sensor 8-6; the control module is connected to the air pump 1, the first electric valve 3, the second electric valve 4, the third electric valve 5, the fourth electric valve 6, the lower contact liquid level gauge 8-3, and the upper contact liquid level gauge 8-5 through wires, and controls the opening and closing of the electric valves according to the signals of the liquid level gauges, so as to realize the switching between the inflation mode and the air extraction mode, and further realize the control of the liquid lead-bismuth to scour the lead oxide ceramic balls 10. The control acquisition module, each electric valve, and each contact liquid level gauge share the power supply.

[0050] In this embodiment, the lower contact liquid level gauge 8-3 and the upper contact liquid level gauge 8-5 are ceramic-wrapped iron cores, and both ends of the iron cores extend a certain length. The iron core at the top of the liquid level gauge is connected to the negative pole of the 24V DC power supply, and the metal part of the mass exchanger 8 is connected to the positive pole of the 24V DC power supply. The metal part of the mass exchanger 8 is the 8-1 metal tank body, which passes through the 16 flange cover and is connected to the positive pole of the 24V DC power supply;

[0051] In an alternative embodiment, the gas pipe of the mass exchanger 8-4 is made of metal, the metal part of the mass exchanger 8 is the mass exchanger 8-4, and the mass exchanger 8-4 is connected to the positive pole of the 24V DC power supply. The connection path is shorter and more stable.

[0052] In this embodiment, the oxygen sensor 8-6 includes a ceramic tube filled with oxide powder inside. Oxygen ions can pass through the ceramic tube. The inside of the ceramic tube is the negative pole, and the liquid lead-bismuth 13 is the positive pole, forming a connected primary battery. A first electrode wire is inserted into the inside of the ceramic tube, a hole is opened on the flange cover 16, and a second electrode wire is hermetically inserted through the flange cover 16 into the liquid lead-bismuth 13. The first electrode wire and the second electrode wire are connected to the control acquisition module to collect the voltage signal between the positive and negative poles of the control acquisition module, and calculate the oxygen concentration.

[0053] The embodiment of the present invention discloses a control system of a pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device according to the present invention, which has the advantages of simple structure and being able to accurately and dynamically adjust the oxygen ion transmission rate, and there is no electric equipment directly contacting the liquid lead-bismuth, solving the problems that instruments such as motors cannot withstand high temperatures and thus malfunction.

[0054] Another embodiment of the present invention also discloses a usage method of a pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange device according to the present invention, including the following steps:

[0055] Step S1: Open the first electric valve 3, the second electric valve 4, the third electric valve 5, and the fourth electric valve 6; inject liquid lead-bismuth into the coolant container 14; close the flange cover 16; inject the covering inert gas 12 into the coolant container 14, and adjust the liquid level height of the liquid lead-bismuth so that the upper contact type liquid level gauge 8-5 can transmit a signal;

[0056] Step S2: Close the first electric valve 3 and the third electric valve 5, turn on the inflation mode of the air pump 1, and through the inflation circuit, inflate the covering inert gas in the coolant container 14 into the mass exchanger 8, so that the liquid level of the liquid lead-bismuth in the mass exchanger 8 drops until the signals of the upper contact type liquid level gauge 8-5 and the lower contact type liquid level gauge 8-3 disappear in sequence;

[0057] Step S3: After the signal of the lower contact type liquid level gauge 8-3 disappears, open the first electric valve 3 and the third electric valve 5, close the second electric valve 4 and the fourth electric valve 6, turn on the air extraction mode of the air pump 1, and through the air extraction circuit, extract the covering inert gas in the mass exchanger 8 and inject it into the coolant container 14. As the air pressure in the mass exchanger 8 and the coolant container 14 reaches equilibrium, the liquid level of the liquid lead-bismuth in the mass exchanger 8 rises, and the lower contact type liquid level gauge 8-3 and the upper contact type liquid level gauge 8-5 transmit signals in sequence;

[0058] Step S4: After the upper contact type liquid level gauge 8-5 transmits a signal, repeat Step S2 and Step S3 to control the liquid lead-bismuth 13 to scour the lead oxide ceramic balls 10;

[0059] Read the signal of the oxygen sensor 8-6. When the oxygen concentration of the liquid lead-bismuth at the bottom of the coolant container 14 is less than or equal to 1E-5 wt.%, increase the power of the air pump 1 to increase the exchange rate of oxygen ions; when the oxygen concentration of the liquid lead-bismuth at the bottom of the coolant container 14 is greater than 1E-5 wt.%, reduce the power of the air pump 1 to reduce the exchange rate of oxygen ions, so as to realize the pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange control.

[0060] In this embodiment, first, open the first electric valve 3, the second electric valve 4, the third electric valve 5, and the fourth electric valve 6, install and fix the mass exchanger 8 on the flange cover 16, so that the depth at which the mass exchanger penetrates can enable the upper contact liquid level gauge to transmit a signal; then close the first electric valve 3 and the third electric valve 5, turn on the air pump 1, the inert gas covering in the coolant container is pumped out by the air pump and injected into the mass exchanger 8 through the air circulation loop, the lead-bismuth liquid level in the mass exchanger drops, and at the same time, the signals of the upper contact liquid level gauge 8-5 and the lower contact liquid level gauge 8-3 disappear in sequence; after the signal of the lower contact liquid level gauge 8-3 disappears, open the first electric valve 3 and the third electric valve 5, close the second electric valve 4 and the fourth electric valve 6, the inert gas covering in the mass exchanger is pumped out by the air pump and injected into the coolant container, the air pressures in the mass exchanger and the coolant container are balanced, the lead-bismuth liquid level in the mass exchanger rises, and the lower contact liquid level gauge and the upper contact liquid level gauge transmit signals in sequence; after the upper contact liquid level gauge 8-5 transmits a signal, repeat the above steps, and at the same time record the signal of the oxygen sensor 8-6, read the signal of the oxygen sensor 8-6, when the oxygen concentration of the liquid lead-bismuth at the bottom of the coolant container 14 is less than or equal to 1E-5 wt.%, increase the power of the air pump 1 to improve the exchange rate of oxygen ions; when the oxygen concentration of the liquid lead-bismuth at the bottom of the coolant container 14 is greater than 1E-5 wt.%, reduce the power of the air pump 1 to reduce the exchange rate of oxygen ions, so as to realize the pneumatic liquid lead-bismuth solid-state oxygen control oxygen ion exchange control.

Claims

1. A pneumatic liquid lead-bismuth solid-state oxygen-controlled oxygen ion exchange device, characterized in that: include: Gas circulation loop (15), coolant container (14), mass exchanger (8); The air circulation loop (15) comprises: an air pump (1), a first electric valve (3), a second electric valve (4), a third electric valve (5), and a fourth electric valve (6); the air pump (1) is an integrated pump for air extraction and air injection; The coolant container (14) comprises: a tank body and a flange cover (16); the flange cover (16) is provided with a first air pipe through hole (16-1), a second air pipe through hole (16-2) and a mass exchanger air pipe (8-4); the tank body and the flange cover (16) form a closed space, the bottom of the closed space is filled with liquid lead bismuth (13), and the rest of the closed space is filled with a covering inert gas (12); The mass exchanger (8) comprises: a metal tank body (8-1) with an open top and a bottom, the top of the metal tank body (8-1) being fixedly connected to a flange cover (16); a charging cavity wall (8-10) with an open top and a bottom is arranged inside the metal tank body (8-1); the top of the charging cavity wall (8-10) is fixedly connected to the flange cover (16); the charging cavity wall (8-10) and the metal tank body (8-1) are coaxial, and an internal space communicating with a mass exchanger air pipe (8-4) is formed inside the metal tank body (8-1) through the charging cavity wall (8-10); an external space is formed between the charging cavity wall (8-10) and the metal tank body (8-1); The first air pipe through hole (16-1), the fourth electric valve (6), the second three-way (17-2), the air pump (1), the first three-way (17-1), the second electric valve (4), the third three-way (17-3), and the mass exchanger air pipe (8-4) are connected in series through air pipes to form an air charging circuit; the second air pipe through hole (16-2), the first electric valve (3), the first three-way (17-1), the air pump (1), the second three-way (17-2), the third electric valve (5), the third three-way (17-3), and the mass exchanger air pipe (8-4) are connected in series through air pipes to form an air extraction circuit; an upper grid plate (9) and a lower grid plate (11) are provided in the internal space, and the upper grid plate (9), the lower grid plate (11) and the charging chamber wall (8-10) together enclose a plurality of The invention discloses a charging space for lead oxide ceramic balls (10); an upper grid plate (9) and a lower grid plate (11) are respectively fixedly connected to a charging chamber wall (8-10); a pressure balance hole (8-8) is provided on the charging chamber wall (8-10); the pressure balance hole (8-8) is located between the upper grid plate (9) and a flange cover (16); an upper contact type liquid level gauge (8-5), a lower contact type liquid level gauge (8-3) and an oxygen sensor (8-6) are sealed through a connecting sleeve and pass through the flange cover (16) to penetrate into the external space; the bottom of the upper contact type liquid level gauge (8-5) is at the same level as the upper grid plate (9); the bottom of the lower contact type liquid level gauge (8-3) is at the same level as the lower grid plate (11); and the bottom of the oxygen sensor (8-6) extends out of the bottom of the metal tank body (8-1).

2. The pneumatic liquid lead-bismuth solid-state oxygen-controlled oxygen ion exchange device according to claim 1 is characterized in that: A cooling coil (7) is provided between the third three-way pipe (17-3) and the mass exchanger air pipe (8-4).

3. The pneumatic liquid lead-bismuth solid-state oxygen-controlled oxygen ion exchange device according to claim 1 is characterized in that: The charging chamber wall (8-10) is provided with a plurality of symmetrically distributed air pressure balance holes.

4. The pneumatic liquid lead-bismuth solid-state oxygen-controlled oxygen ion exchange device according to claim 1 is characterized in that: A pressure difference sensor (2) is arranged between the air inlet and the air outlet of the air pump (1).

5. The pneumatic liquid lead-bismuth solid-state oxygen-controlled oxygen ion exchange device according to claim 1 is characterized in that: The lower grid plate (11) is fixedly connected to the lower cavity wall (8-11), threaded fixing holes (8-7) are provided at corresponding positions of the lower cavity wall (8-11) and the charging cavity wall (8-10), and the lower cavity wall (8-11) and the charging cavity wall (8-10) are detachably fixedly connected via threads.

6. The pneumatic liquid lead-bismuth solid-state oxygen-controlled oxygen ion exchange device according to claim 1 is characterized in that: The materials of the tank body, the flange cover (16), the metal tank body (8-1) and the mass exchanger air pipe (8-4) are conductive materials that are resistant to lead-bismuth corrosion.

7. The pneumatic liquid lead-bismuth solid-state oxygen-controlled oxygen ion exchange device according to claim 1 is characterized in that: The air pressure balance holes are two through holes symmetrically distributed on the charging chamber wall (8-10), the diameter of the air pressure balance holes is 3 mm, and they are located between the upper grid plate (9) and the flange cover (16); the flow rate of the air pump (1) can reach a maximum of 1L / min, and a throttling device is provided for the air pump (1) to adjust the flow rate.

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