Lead bismuth oxide control integrated gas distribution system

Abstract

The utility model discloses a kind of lead bismuth oxygen control integrated gas distribution system, mixer and three gas paths, the air outlet of three gas paths is respectively communicated with the air inlet of mixer, the air inlet of three gas paths is respectively connected hydrogen, argon and oxygen gas source, and three gas paths are respectively used to supply hydrogen, argon and oxygen to mixer;The air outlet of the mixer is communicated with lead bismuth kettle inside.The utility model not only can realize the control to the oxygen concentration in liquid lead bismuth alloy, simultaneously used in different oxygen concentration in liquid lead bismuth alloy to material corrosion test.

Description

Technical Field

[0001] This utility model relates to the field of gas distribution device technology, and in particular to a lead-bismuth oxygen control integrated gas distribution system. Background Technology

[0002] The lead-based fast reactor has been recognized by the Generation IV International Forum (GIF) as the first generation fourth-generation reactor to achieve industrial demonstration and commercial application. This is because lead / lead-bismuth is extremely corrosive to materials, especially under high temperature and high oxygen concentration conditions.

[0003] Controlling the oxygen concentration in liquid lead-bismuth alloy in lead-cooled fast reactors is often used as a method to prevent the corrosive effect of coolant on structural materials. Therefore, there is an urgent need for an integrated lead-bismuth oxygen control gas distribution system that can control the oxygen concentration in liquid lead-bismuth alloy. Utility Model Content

[0004] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a lead-bismuth oxygen control integrated gas distribution system, which can not only control the oxygen concentration in liquid lead-bismuth alloys, but also be used for corrosion testing of materials with different oxygen concentrations in liquid lead-bismuth alloys. The objective of this utility model is achieved through the following technical solution: A lead-bismuth oxygen-controlled integrated gas distribution system includes a mixer and three gas paths. The outlets of the three gas paths are respectively connected to the inlets of the mixer, and the inlets of the three gas paths are respectively connected to hydrogen, argon, and oxygen gas sources. The three gas paths are used to supply hydrogen, argon, and oxygen to the mixer. The outlet of the mixer is connected to the interior of the lead-bismuth reactor.

[0005] Furthermore, the gas path includes a pressure regulating valve, a filter, a pressure sensor, a first solenoid valve, a gas flow controller, and a check valve connected in sequence.

[0006] Furthermore, a second solenoid valve is also provided in the gas circuit. The inlet end of the second solenoid valve is connected between the pressure sensor and the first solenoid valve, and the outlet end of the second solenoid valve is connected between the gas flow controller and the check valve.

[0007] Furthermore, a safety valve and a third solenoid valve are sequentially provided between the mixer and the lead-bismuth reactor; A vacuum pump is connected between the safety valve and the mixer, and a fourth solenoid valve is provided between the vacuum pump and the mixer.

[0008] Furthermore, the lead-bismuth reactor is equipped with an oxygen probe for detecting the oxygen concentration in the liquid lead-bismuth alloy.

[0009] Furthermore, the lead-bismuth reactor includes a frame, a heating furnace mounted on the frame, and a test vessel body mounted inside the heating furnace. The vessel body is equipped with a lid, which is driven up / down by a lift mounted on the frame. The vessel body is equipped with a sample turntable, and the lid is equipped with a servo motor, which is connected to the sample turntable via a transmission connection.

[0010] Furthermore, the lead-bismuth reactor is equipped with an exhaust pipe, and the exhaust pipe is equipped with a waste gas treatment device.

[0011] The beneficial effects of this utility model are: This invention can not only control the oxygen concentration in liquid lead-bismuth alloys, but also be used for corrosion tests on materials with different oxygen concentrations in liquid lead-bismuth alloys. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the lead-bismuth oxygen control integrated gas distribution system in an embodiment of this utility model; Figure 2 This is a schematic diagram of the lead-bismuth reactor. In the diagram, 1. Mixer; 2. Lead-bismuth reactor; 3. Pressure regulating valve; 4. Filter; 5. Pressure sensor; 6. First solenoid valve; 7. Gas flow controller; 8. Check valve; 9. Second solenoid valve; 10. Safety valve; 11. Third solenoid valve; 12. Vacuum pump; 13. Fourth solenoid valve; 14. Oxygen probe; 15. Stand; 16. Test vessel body; 17. Reactor lid; 18. Lift; 19. Sample turntable; 20. Servo motor; 21. Waste gas treatment device; 22. Heating furnace. Detailed Implementation

[0013] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0014] See Figures 1-2 This utility model provides a technical solution: Example: like Figure 1 As shown, a lead-bismuth oxygen control integrated gas distribution system includes a mixer 1 and three gas paths. The outlets of the three gas paths are respectively connected to the inlets of the mixer 1, and the inlets of the three gas paths are respectively connected to hydrogen, argon and oxygen gas sources. The three gas paths are respectively used to supply hydrogen, argon and oxygen into the mixer 1. The outlet of the mixer 1 (through a pipe) is connected to the interior of the lead-bismuth reactor 2.

[0015] The gas path includes a pressure regulating valve 3, a filter 4, a pressure sensor 5, a first solenoid valve 6, a gas flow controller 7, and a check valve 8 connected in sequence.

[0016] The gas path is also provided with a second solenoid valve 9. The inlet end of the second solenoid valve 9 is connected between the pressure sensor 5 and the first solenoid valve 6, and the outlet end of the second solenoid valve 9 is connected between the gas flow controller 7 and the one-way valve 8.

[0017] A safety valve 10 and a third solenoid valve 11 are sequentially provided between the mixer 1 and the lead-bismuth reactor 2; A vacuum pump 12 is connected between the safety valve 10 and the mixer 1, and a fourth solenoid valve 13 is provided between the vacuum pump 12 and the mixer 1.

[0018] The lead-bismuth vessel 2 is equipped with an oxygen probe 14 for detecting the oxygen concentration in the liquid lead-bismuth alloy.

[0019] like Figure 2 As shown, the lead-bismuth reactor 2 includes a frame 15, a heating furnace 22 mounted on the frame 15, and a test vessel body 16 disposed within the heating furnace 22. The vessel body is equipped with a lid 17, which is driven up / down by a lift 18 mounted on the frame 15. A sample turntable 19 is disposed within the vessel body. A servo motor 20 is mounted on the lid 17, and the servo motor 20 is connected to the sample turntable 19 via a transmission connection. The lid 17 also has a thermocouple interface and an oxygen probe interface. The thermocouple extends into the vessel body through the thermocouple interface, and the oxygen probe 14 extends into the vessel body through the oxygen probe interface. A drain pipe with a manual drain valve is located at the bottom of the vessel body.

[0020] The lead-bismuth reactor 2 is equipped with an exhaust pipe, and the exhaust pipe is equipped with a waste gas treatment device 21. Among them, 1. The oxygen probe 14 is a Bi-Bi2O3 type oxygen sensor; 2. It also includes a control system, which includes a touch screen, PLC, a set of various interface cards and acquisition cards, and matching control software; the control system is connected to the oxygen probe 14, various valves and other measurement and control components, and sends and receives signals for functions such as sample rack and oxygen probe lifting and lowering position control, heating temperature control and temperature acquisition and recording, opening of various baffle valves, and pressure control (mainly controlling the pressure within a set range, without setting a constant pressure). This control is existing technology in the field, and the specific structure and control principle will not be described here. 3. The outlet of the three gas paths can be, but is not limited to, connected to the inlet of the mixer 1 through a four-way connector (cross connector), or it can be that three inlets are set on the mixer 1 and connected to the outlet of the three gas paths through three connectors respectively. 4. The mixer 1 is existing technology, used for gas mixing, and its specific structure will not be described here. 5. The waste gas treatment device 21 is existing technology, which can be, but is not limited to, a filter screen, or can be selected according to actual needs, and will not be described here.

[0021] When this integrated lead-bismuth oxygen control gas distribution system is used to control the oxygen concentration in liquid lead-bismuth alloys, its operating steps are as follows: A vacuum pump 12 is used to evacuate the lead-bismuth vessel 2. Then, argon and oxygen are simultaneously introduced into the lead-bismuth vessel 2. The oxygen concentration in the liquid lead-bismuth alloy is detected by an oxygen probe 14. If the oxygen concentration reaches the target concentration, the process stops; if it is insufficient, oxygen and argon are continuously introduced, with argon serving as a protective gas. If the oxygen concentration exceeds the target concentration, the oxygen supply is stopped, and hydrogen and argon are introduced to reduce the oxygen concentration in the liquid lead-bismuth alloy, thereby bringing it back to the target concentration.

[0022] The above steps allow for the control of oxygen concentration in the liquid lead-bismuth alloy to meet specific conditions, ensuring the formation of a protective oxide film on the material surface. Both excessively high and low oxygen concentrations in lead-bismuth are detrimental to the formation and stability of the oxide film and can easily lead to corrosion of the material.

[0023] The operating steps of this integrated oxygen control gas distribution system for lead-bismuth alloys are as follows: When used for corrosion tests on liquid lead-bismuth alloys with different oxygen concentrations, the system is designed to withstand these conditions. The test sample is placed on the sample turntable 19, and then the lid 17 is lowered and closed by the elevator 18. At the same time, the turntable is lowered into the liquid lead-bismuth alloy. The sample turntable 19 is a disc structure with threaded holes, which can be used to fix the sample.

[0024] After the test sample is placed in the test vessel, a resistance vacuum gauge is used to measure the vacuum, with a measurement range of atmospheric pressure to 10⁻¹ Pa. A vacuum pressure gauge is also installed on the test vessel 16. A safety valve 10 is set up so that when the pressure inside the test vessel 16 exceeds 0.15 MPa, the safety valve 10 will automatically open to relieve pressure on the test vessel 16.

[0025] As described above, the oxygen concentration in the liquid lead-bismuth alloy is controlled. The interface starts the test when the oxygen concentration in the liquid lead-bismuth alloy reaches the target value. During the test, the test sample is driven by a servo motor 20 and a precision planetary reducer to rotate the sample disk (the precision planetary reducer is connected to the sample turntable 19 through a magnetic fluid sealed rotating shaft assembly). The magnetic fluid sealed rotating shaft assembly ensures reliable sealing of the rotating shaft. The relative speed of the sample is 6 m / s. According to this requirement, the sample rotation speed is about 400 r / min. Considering that the liquid will also move, the maximum rotation speed of the sample disk is designed to be 700 r / min.

[0026] Once the test is completed, the test sample is removed and corrosion analysis is performed using relevant corrosion detection equipment to complete the corrosion test of liquid lead-bismuth alloy under different oxygen concentrations.

[0027] This invention can not only control the oxygen concentration in liquid lead-bismuth alloys, but also be used for corrosion tests on materials with different oxygen concentrations in liquid lead-bismuth alloys.

[0028] The above description is merely a preferred embodiment of this utility model. It should be understood that this utility model is not limited to the forms disclosed herein and should not be construed as excluding other embodiments. It can be used in various other combinations, modifications, and environments, and can be altered within the scope of the concept described herein through the above teachings or related technologies or knowledge. Modifications and variations made by those skilled in the art that do not depart from the spirit and scope of this utility model should be protected within the scope of the appended claims.

Claims

1. A lead bismuth oxide controlled integrated gas distribution system characterized by: The mixer has three gas lines. The outlets of the three gas lines are connected to the inlets of the mixer, and the inlets of the three gas lines are connected to hydrogen, argon and oxygen gas sources, respectively. The three gas lines are used to supply hydrogen, argon and oxygen into the mixer. The outlet of the mixer is connected to the interior of the lead-bismuth reactor.

2. The integrated lead bismuth oxide controlled atmosphere gas distribution system of claim 1, wherein: The gas path includes a pressure regulating valve, a filter, a pressure sensor, a first solenoid valve, a gas flow controller, and a check valve connected in sequence.

3. The integrated lead bismuth oxide controlled atmosphere gas distribution system of claim 2, wherein: The gas path is also equipped with a second solenoid valve. The inlet end of the second solenoid valve is connected between the pressure sensor and the first solenoid valve, and the outlet end of the second solenoid valve is connected between the gas flow controller and the check valve.

4. The integrated lead bismuth oxide controlled atmosphere gas distribution system of claim 1, wherein: A safety valve and a third solenoid valve are sequentially installed between the mixer and the lead-bismuth reactor; A vacuum pump is connected between the safety valve and the mixer, and a fourth solenoid valve is provided between the vacuum pump and the mixer.

5. The integrated lead bismuth oxide controlled atmosphere gas distribution system of claim 4, wherein: The lead-bismuth reactor is equipped with an oxygen probe for detecting the oxygen concentration in the liquid lead-bismuth alloy.

6. The integrated lead bismuth oxide controlled atmosphere gas distribution system of claim 4, wherein: The lead-bismuth reactor includes a frame, a heating furnace mounted on the frame, and a test vessel body mounted inside the heating furnace. The vessel body is equipped with a lid, which is driven up / down by a lift mounted on the frame. The vessel body is equipped with a sample turntable, and the lid is equipped with a servo motor, which is connected to the sample turntable via a transmission connection.

7. The integrated lead bismuth oxide controlled atmosphere gas distribution system of claim 1, wherein: The lead-bismuth reactor is equipped with an exhaust pipe, and the exhaust pipe is equipped with a waste gas treatment device.

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