CN216792099U - Integrated sealed oxygen concentration sensor for liquid lead-bismuth alloy - Google Patents

Abstract

The invention discloses an integrated sealed liquid lead-bismuth alloy oxygen concentration sensor, which mainly includes a signal unit, an instrument support unit and a core oxygen measuring element. The solid oxide electrolyte ceramic probe equipped with the reference electrode in the core oxygen measuring element is fixedly installed in the protective steel sleeve, and the protective steel sleeve is mechanically connected with the stainless steel support cylinder; The connector is connected, and the signal quick connector is connected with the positive pole of the signal unit through the connecting wire; the upper end of the stainless steel support cylinder is mechanically sealed by the stainless steel sealing outer joint thread of the insulating head, and one end of the stainless steel sealing outer joint is connected with the negative pole of the electromotive force signal display instrument through the signal connecting wire. The other end of the stainless steel sealed outer connector is grounded. When the core oxygen measuring element of the oxygen concentration sensor is inserted into the liquid lead-bismuth alloy to be measured, the signal unit directly obtains the electromotive force, and the oxygen concentration in the liquid lead-bismuth alloy is obtained by solving the relationship between the electromotive force and the oxygen concentration.

Description

An integrated sealed liquid lead-bismuth alloy oxygen concentration sensor

technical field

The utility model relates to the field of fourth-generation nuclear reactor lead-based coolant oxygen concentration sensors, in particular to an integrated sealed liquid lead-bismuth alloy oxygen concentration sensor.

Background technique

The liquid lead-bismuth alloy, which is the preferred material for spallation targets in lead-based fast reactor coolants and accelerator-driven subcritical systems of the fourth generation reactors, has strong corrosiveness to reactor structural materials at high temperatures, and its corrosiveness is affected by oxygen concentration. If the oxygen concentration is too low, the corrosion of iron-based metal materials will be accelerated by the liquid lead-bismuth alloy. If the oxygen concentration is too high, the oxides of the liquid lead-bismuth alloy will be polluted. Studies have shown that there is an area where oxygen will form a dense and uniform oxide layer on the surface of the iron-based metal material in the oxygen concentration in the liquid lead-bismuth alloy at different temperatures, and the oxide layer can prevent the liquid lead-bismuth alloy from further corrosion of structural steel. Therefore, accurate measurement of the oxygen content in the liquid lead-bismuth alloy is crucial for controlling the oxygen concentration of the liquid lead-bismuth alloy. Using the ionic conduction function of solid oxide electrolyte ceramics, an electrochemical primary cell assembly capable of measuring extremely low oxygen concentration dissolved in a liquid lead-bismuth alloy coolant system was prepared. When the coolant system is stable above 200 °C, the solid oxide electrolyte Different oxygen partial pressures on both sides generate concentration electromotive force, and the real-time electromotive force is read out through the connected voltmeter to realize online monitoring of dissolved oxygen content in the liquid lead-bismuth alloy coolant system.

Utility model content

The technical problem solved by the utility model is: to overcome the deficiencies of the prior art, an integrated sealed liquid lead-bismuth alloy oxygen concentration sensor is provided, which can accurately monitor the dissolved oxygen content in the liquid lead-bismuth alloy coolant system above 200° C. Lead-bismuth alloy oxygen concentration control provides upstream data.

The technical solution adopted by the utility model to solve the above-mentioned technical problems is as follows: an integrated sealed liquid lead-bismuth alloy oxygen concentration sensor, including a signal unit, an instrument support unit and a core oxygen measuring element; the signal unit includes a voltmeter (14 ), a positive connecting wire (15), a negative connecting wire (13), a grounding wire (16), a signal quick connector (4) and an electrode wire (10); the instrument support element includes a stainless steel support cylinder ( 1), sealing flange (5), inner insulating tube (6), insulating head (3), stainless steel sealing outer joint (2); the core oxygen measuring element includes a solid oxide electrolyte ceramic probe (12), a reference a specific electrode (11), a protective steel sleeve (9), an inner graphite sealing ring (8), a graphite gasket (7); the core oxygen measuring element is equipped with a solid oxide electrolyte ceramic probe with a quantitative reference electrode (11) (12) It is fixedly installed in the protective steel sleeve (9), and is sealed by the inner graphite sealing ring (8). sealing; the exposed part of the lower end of the electrode wire (10) partially wrapped by the inner insulating tube (6) is inserted into the reference electrode (11), and the upper end is connected with the signal quick connector (4); the signal quick connector (4) It is wrapped and fixed by the insulating head (16), and is connected to the positive electrode of the voltmeter (14) through the positive connecting wire (15); the upper end of the stainless steel support cylinder (1) is sealed by the stainless steel outer joint (2) of the insulating head (3). Threaded mechanical seal, one end of the stainless steel sealed outer connector (2) is connected to the negative electrode of the voltmeter (14) through the negative connecting wire (13), the other end of the stainless steel sealed outer connector (2) is grounded, and the voltmeter can directly obtain the electromotive force of the primary battery component.

When the core oxygen measuring element of the oxygen concentration sensor is inserted into the liquid lead-bismuth alloy whose oxygen concentration is to be measured, the liquid lead-bismuth alloy and the solid oxide electrolyte ceramic probe (12), the reference electrode (11), and the electrode wire (10) , signal quick connector (4), positive connection wire (15), voltmeter (14), negative connection wire (13), stainless steel sealed outer connector (2), stainless steel support cylinder (1), and protective steel sleeve (9). A complete primary cell circuit.

The solid oxide electrolyte ceramic probe (12) is in the shape of a crucible with a closed bottom end, the material type is yttrium oxide partially stabilized zirconia (YPSZ), and 5.5mol% yttrium oxide is used, and the oxygen concentration sensor only has oxygen ions when working Migration is enabled through the solid oxide electrolyte ceramic probe (12).

Wherein, the material used for the reference electrode (11) is Cu/Cu2O, which is in powder form, with a particle size of 5-10 μm, a purity of 99.9%, and a mass ratio of Cu to Cu2O of 1:1.

Wherein, the material used for the electrode wire (10) is tantalum, and the purity is 99.9%.

Wherein, the material used for the No. 1 electrode wire and the No. 2 electrode wire is tantalum or molybdenum.

Among them, the signal display instrument is a voltmeter (14), which adopts a high input resistance (>10GΩ) voltmeter.

Among them, the solid oxide electrolyte ceramic probe (12) and the protective steel sleeve (9) are sealed by the inner graphite sealing ring (8), while the protective steel sleeve (9) and the stainless steel support cylinder (1) are sealed by the graphite gasket (7), The purpose of using the graphite seal is to prevent the liquid lead-bismuth alloy from entering the stainless steel support cylinder (1) and the solid oxide electrolyte ceramic probe (12) and causing damage to the oxygen concentration sensor.

Wherein, the solid oxide electrolyte ceramic probe (12) of the integrated sealed liquid lead-bismuth alloy oxygen concentration sensor needs to be activated above 300°C, and the minimum working temperature is 200°C.

Wherein, the upper part of the stainless steel support cylinder (1) is provided with heat dissipation fins.

Wherein, the part of the No. 1 electrode wire in the stainless steel casing is wrapped with an inner insulating tube, which can avoid short circuit caused by contact with the stainless steel casing.

Wherein, the electrode wire (10) is wrapped with an inner insulating tube (6) at the part of the stainless steel support cylinder (1), which can avoid short circuit caused by contact with the stainless steel support cylinder (1).

Wherein, the solid oxide electrolyte ceramic probe (12) is fixedly installed in a protective steel sleeve (9), sealed by an inner graphite sealing ring (8), and the protective steel sleeve (9) passes through the lower end of the stainless steel support cylinder (1). The threaded mechanical connection is sealed by a graphite gasket (7). The upper end of the stainless steel support cylinder (1) is sealed by a combination of an insulating head (3) and a stainless steel sealing outer joint (2). The oxygen concentration sensor has good sealing performance and can isolate the external environment.

Wherein, the stainless steel support cylinder (1) is provided with a sealing flange (5), which can easily adjust the installation position of the oxygen concentration sensor, and is conducive to measuring the oxygen concentration of the liquid lead-bismuth alloy at different positions and temperatures of the coolant system.

The advantages of the present utility model compared with the prior art are:

The utility model adopts the principle of electrochemical primary cell, takes Cu/Cu2O with known oxygen concentration as the reference electrode, liquid lead-bismuth alloy coolant with the oxygen concentration to be measured as the measuring electrode, 5.5mol% yttrium oxide partially stabilized zirconia ( YPSZ) as a solid oxide electrolyte, the lowest temperature that can be measured is 200 °C, which can accurately determine the dissolved oxygen concentration of the non-isothermal liquid lead-bismuth alloy coolant system, and provide the necessary upstream data for the control of the oxygen concentration of liquid lead-bismuth alloys. Long-term operation of lead-bismuth alloy coolant systems.

Description of drawings

Fig. 1 is the principle schematic diagram of electrochemical primary cell in the utility model; Fig. 2 is the working schematic diagram of the utility model; Fig. 3 is the utility model structural representation;

Among them: stainless steel support cylinder (1) with cooling fins, stainless steel sealing outer joint (2), insulating head (3), signal quick connector (4), sealing flange (5), inner insulating tube (6), Graphite gasket (7), inner graphite sealing ring (8), protective steel sleeve (9), electrode wire (10), reference electrode (11), solid oxide electrolyte ceramic probe (12), negative electrode connecting wire (13) , voltmeter (14), positive connection wire (15), ground wire (16).

Detailed ways

The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, not all of them. Embodiments, based on the embodiments in the invention, all other embodiments obtained by those of ordinary skill in the art on the premise of no creative work, all belong to the protection scope of the present invention.

As shown in FIG. 1 , in the embodiment of the present invention, the principle of the electrochemical primary cell is that the oxygen ions migrate through the solid oxide electrolyte to generate electromotive force due to the different oxygen concentrations of the cathode and the anode on both sides of the solid oxide electrolyte.

As shown in the working schematic diagram of the present utility model in Figure 2, the Cu/Cu2O with known oxygen concentration is used as the reference electrode, the liquid lead-bismuth alloy coolant with the oxygen concentration to be measured is used as the measuring electrode, and the 5.5mol% yttrium oxide is partially stable Zirconium oxide (YPSZ) is used as a solid oxide electrolyte. When the solid oxide electrolyte ceramic probe is inserted into the liquid lead-bismuth alloy whose oxygen concentration is to be measured, the oxygen ion electromotive force can be obtained intuitively through a high input resistance (>10GΩ) voltmeter. The equation is solved to obtain the dissolved oxygen concentration of the liquid lead-bismuth alloy system.

As shown in the schematic structural diagram of the present utility model in FIG. 3, an integrated sealed liquid lead-bismuth alloy oxygen concentration sensor includes a signal unit, an instrument support unit and a core oxygen measuring element; the signal unit includes a voltmeter (14) , a positive connection wire (15), a negative connection wire (13), a ground wire (16), a signal quick connector (4) and an electrode wire (10); the instrument support element includes a stainless steel support cylinder with heat dissipation fins (1 ), sealing flange (5), inner insulating tube (6), insulating head (3), stainless steel sealing outer joint (2); the core oxygen measuring element includes a solid oxide electrolyte ceramic probe (12), a reference Electrode (11), protective steel sleeve (9), inner graphite sealing ring (8), graphite gasket (7).

Liquid lead-bismuth alloy and solid oxide electrolyte ceramic probe (12), reference electrode (11), electrode wire (10), signal quick connector (4), positive connection lead (15), voltmeter (14), The negative electrode connecting wire (13), the stainless steel sealed outer joint (2), the stainless steel support cylinder (1), and the protective steel sleeve (9) form a complete primary battery circuit.

The solid oxide electrolyte ceramic probe (12) of the oxygen concentration sensor of the utility model needs to be activated above 300°C, and the minimum working temperature is 200°C.

The oxygen ion electromotive force is obtained intuitively through a high input resistance (>10GΩ) voltmeter, and the dissolved oxygen concentration of the liquid lead-bismuth alloy system is obtained by solving the Nernst equation, which can monitor the dissolved oxygen concentration of the liquid lead-bismuth alloy coolant system in real time.

As shown in Figure 3, the stainless steel support cylinder (1) is provided with a sealing flange (5), which can easily adjust the installation position of the oxygen concentration sensor, which is conducive to measuring the oxygen content of the liquid lead-bismuth alloy at different positions and temperatures of the coolant system. concentration

To sum up, the utility model is an integrated sealed liquid lead-bismuth alloy oxygen concentration sensor, which can monitor the dissolved oxygen concentration of the liquid lead-bismuth alloy coolant system in real time online, and provides the oxygen concentration control of the liquid lead-bismuth alloy coolant system. Necessary upstream data.

The above is only a preferred embodiment of the present invention, and of course it cannot limit the scope of the rights of the present invention. Therefore, the equivalent changes made according to the claims of the present invention still belong to the protection scope of the present invention.

Claims (12)

1. An integrated sealed type liquid lead bismuth alloy oxygen concentration sensor is characterized by comprising a signal unit, an instrument supporting unit and a core oxygen measuring element; the signal unit comprises a voltmeter (14), a positive electrode connecting lead (15), a negative electrode connecting lead (13), a grounding lead (16), a signal quick connector (4) and an electrode wire (10); the instrument supporting unit comprises a stainless steel supporting cylinder (1) with radiating fins, a sealing flange (5), an inner insulating pipe (6), an insulating seal head (3) and a stainless steel sealing outer joint (2); the core oxygen measuring element comprises a solid oxide electrolyte ceramic probe (12), a reference electrode (11), a protective steel sleeve (9), an inner graphite sealing ring (8) and a graphite gasket (7); a solid oxide electrolyte ceramic probe (12) provided with a quantitative reference electrode (11) in the core oxygen measuring element is fixedly arranged in a protective steel sleeve (9) and is sealed by an inner graphite sealing ring (8), and the protective steel sleeve (9) is mechanically connected with the lower end of the stainless steel supporting cylinder (1) through threads and is sealed by a graphite gasket (7); the exposed part of the lower end of the electrode wire (10) partially wrapped by the inner insulating tube (6) is inserted into the reference electrode (11), and the upper end of the electrode wire is connected with the signal quick connector (4); the signal quick connector (4) is wrapped and fixed by the insulating seal head (3) and is connected with the positive electrode of the voltmeter (14) through the positive electrode connecting wire (15); the upper end of the stainless steel supporting cylinder (1) is mechanically sealed by a stainless steel sealing outer joint (2) of the insulating seal head (3) in a threaded manner, one end of the stainless steel sealing outer joint (2) is connected with the negative electrode of a voltmeter (14) through a negative electrode connecting wire (13), the other end of the stainless steel sealing outer joint (2) is connected with a grounding wire (16), and the voltmeter visually obtains the electromotive force of a primary battery assembly.

2. The integrally sealed liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein when a core oxygen measuring element of the oxygen concentration sensor is inserted into the liquid lead-bismuth alloy to be measured for oxygen concentration, the liquid lead-bismuth alloy, the solid oxide electrolyte ceramic probe (12), the reference electrode (11), the electrode wire (10), the signal quick connector (4), the positive connecting lead (15), the voltmeter (14), the negative connecting lead (13), the stainless steel sealing external connector (2), the stainless steel support cylinder (1) and the protective steel sleeve (9) form a complete galvanic cell loop.

3. The one-piece sealed type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the solid oxide electrolyte ceramic probe (12) is in a crucible shape with a closed bottom end, and only oxygen ions can migrate through the solid oxide electrolyte ceramic probe (12) when the oxygen concentration sensor is in operation.

4. The one-piece sealed type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the reference electrode (11) is a metal oxide having a known oxygen concentration.

5. The one-piece sealed type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the electrode wire (10) is made of tantalum.

6. The one-piece sealed type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the voltmeter (14) is a high input resistance voltmeter having a resistance of more than 10G Ω.

7. The one-piece sealed type liquid lead bismuth alloy oxygen concentration sensor according to claim 1, wherein the solid oxide electrolyte ceramic probe (12) and the protective steel sleeve (9) are sealed by an inner graphite sealing ring (8), and the protective steel sleeve (9) and the stainless steel support cylinder (1) are sealed by a graphite gasket (7), the graphite sealing is used for preventing the liquid lead bismuth alloy from entering the stainless steel support cylinder (1) and the solid oxide electrolyte ceramic probe (12) to cause the oxygen concentration sensor to be damaged.

8. The one-piece sealed type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the activation is performed at 300 ℃ or more for 30 minutes, and the minimum working temperature is 200 ℃.

9. The one-piece sealed type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the stainless steel support cylinder (1) is provided with heat dissipation fins at the upper part.

10. The oxygen concentration sensor of the integrally sealed type liquid lead-bismuth alloy as claimed in claim 1, wherein the wire electrode (10) is wrapped at the stainless steel support cylinder (1) by the inner insulating tube (6) to avoid short circuit caused by contact with the stainless steel support cylinder (1).

11. The integrated sealing type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the upper end of the stainless steel support cylinder (1) is sealed by the combination of the insulating seal head (3) and the stainless steel sealing outer joint (2), and the oxygen concentration sensor has good sealing performance and can isolate the external environment.

12. The integrally sealed type liquid lead-bismuth alloy oxygen concentration sensor according to claim 1, wherein the stainless steel support cylinder (1) is provided with a sealing flange (5), so that the installation position of the oxygen concentration sensor can be conveniently adjusted, and the oxygen concentration of the liquid lead-bismuth alloy at different positions and different temperatures of the coolant system can be conveniently measured.

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