Error analysis method and device for wide-range liquid metal oxygen concentration sensor

Abstract

The invention provides a wide-range liquid metal oxygen concentration sensor error analysis method and device, relates to the technical field of liquid metal experiment devices, and solves the technical problem that the output voltage error test range of an existing liquid metal oxygen sensor is narrow in coverage. According to the invention, Ni and Fe are orderly added into the liquid metal in the PbO oxygen saturation state, and NiO and Fe3O4 can be sequentially generated through reduction reaction, so that the error analysis range of the liquid metal oxygen sensor can be expanded from 0.62-0.85 to 0.62-1.22 V by measuring the output voltage of the oxygen sensor in the Ni / NiO and Fe / Fe3O4 oxygen saturation states and comparing the output voltage with a theoretical saturation potential value. On the basis of widening the analysis range, the error analysis applicability can be improved, and the accuracy evaluation capability of the liquid metal oxygen sensor is improved; the device has the advantages of being wide in measurement range, good in sealing performance, accurate in positioning, convenient to disassemble and assemble and the like, and meets error analysis and accuracy evaluation of the liquid metal oxygen concentration sensor in a wide measuring range.

Description

Technical Field

[0001] The invention relates to the technical field of liquid metal experimental devices, and in particular to an error analysis method and device for a wide-range liquid metal oxygen concentration sensor. Background Art

[0002] Liquid metal cooled reactor is one of the advanced reactor types of Generation IV, with advantages such as high inherent safety and high economy. However, liquid metal has serious dissolution and corrosion to structural materials. If appropriate protective measures are not taken in time, it will affect the safe operation of the reactor system. Liquid metal oxygen concentration measurement and control technology is an important means to solve the problem of liquid metal corrosion. In order to ensure the accuracy of liquid metal oxygen concentration measurement, it is necessary to test the accuracy of liquid metal oxygen concentration sensor.

[0003] The oxide reduction method is one of the test methods for testing the accuracy of liquid metal oxygen sensors and analyzing the measurement errors of liquid metal sensors. The principle is: at a certain temperature, the predictable oxygen potential in the liquid metal is continuously adjusted to decompose the most stable oxide corresponding to the main component of the liquid metal. Specifically, a specific metal additive is added, which is required to be more active than the liquid metal component and the amount added exceeds the corresponding solubility, so that the oxide of the specific metal additive decomposes at an oxygen potential lower than the main component element of the liquid metal, and a solid metal phase is generated during the decomposition.

[0004] For example, the patent with publication number CN104535719A proposes an experimental device suitable for calibration of liquid lead-bismuth alloy oxygen sensor, which is suitable for rapid calibration experiment of different metal oxides of liquid lead-bismuth alloy oxygen sensor in liquid lead-bismuth alloy environment. The oxygen sensor error analysis method developed so far generally evaluates the accuracy of liquid metal oxygen concentration sensor by comparing the oxygen saturation output voltage of Pb / PbO oxygen saturation state measured by oxygen sensor with the theoretical reference potential value. In actual application, the oxygen saturation voltage test range of existing error analysis methods is relatively narrow, and it is impossible to evaluate the accuracy of wider oxygen sensor measurement range. Summary of the invention

[0005] The present invention provides a wide-range liquid metal oxygen concentration sensor error analysis method and device to solve the technical problem that the output voltage error test range of the existing liquid metal oxygen sensor is narrow and the measurement accuracy within the range required for practical application cannot be evaluated.

[0006] The embodiments of the present invention are implemented by the following technical solutions:

[0007] A wide-range liquid metal oxygen concentration sensor error analysis method is provided, which expands the error analysis range of the liquid metal oxygen sensor by sequentially measuring the output voltage of the oxygen sensor under the oxygen saturation state of Ni / NiO and Fe / Fe3O4, and specifically comprises the following steps:

[0008] S1: Loading:

[0009] S2: Melting:

[0010] S3: Warming up:

[0011] S4: Establishment of the initial oxygen saturation state of the liquid metal: introducing an oxidizing gas into the molten container, and then introducing an inert gas to establish a Pb / PbO equilibrium state;

[0012] S5: Pb / PbO saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature at a cooling rate of ≤6°C / h, and obtain the Pb / PbO stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures;

[0013] S6: Establishment of Ni / NiO equilibrium: The liquid metal in the molten container is heated to the highest test temperature, and a Ni block is added to establish Ni / NiO equilibrium, and a stable voltage signal output by the liquid metal oxygen concentration sensor is obtained;

[0014] S7: Ni / NiO saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature at a cooling rate of ≤6°C / h, and obtain the Ni / NiO stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures;

[0015] S8: Establishment of Fe / Fe3O4 equilibrium: The liquid metal in the molten container is heated to the highest test temperature, and Fe blocks are added to establish Fe / Fe3O4 equilibrium, and a stable voltage signal output by the liquid metal oxygen concentration sensor is obtained;

[0016] S9: Fe / Fe3O4 saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature at a cooling rate of ≤6°C / h, and obtain the Fe / Fe3O4 saturated oxygen potential output by the liquid metal oxygen concentration sensor at different temperatures.

[0017] Preferably, the step S1 includes the following specific steps: adding metal ingots into the molten container, and adding Ni blocks and Fe blocks into the metal adding mechanism respectively.

[0018] Preferably, in step S2, the metal ingot in the melting container is heated to melt, and a liquid metal oxygen concentration sensor, a liquid level meter and a thermocouple are installed to the same height 20 mm below the liquid metal surface.

[0019] Preferably, in step S3, the temperature of the liquid metal in the melting container is raised to the highest test temperature, and a mixed gas of inert gas and hydrogen is introduced to reduce oxide impurities in the liquid metal.

[0020] Preferably, in step S4, an oxidizing gas is introduced into the melting container, and after the sensor output is stabilized within the range of ±10 mV, an inert gas is introduced to establish a Pb / PbO equilibrium state.

[0021] like Figure 2 As shown in the figure, in actual application, the measurement range of liquid metal oxygen concentration needs to cover 10-9wt% to 10-2wt%. According to the Nernst equation, the liquid metal oxygen concentration is calculated by measuring the voltage value output by the oxygen sensor and the liquid metal temperature value. Taking liquid lead-bismuth alloy as an example, for an oxygen sensor with a reference electrode of Pt / Air, in the actual application temperature range of 200°C to 600°C and the oxygen concentration range of 10-9wt% to 10-2wt%, the corresponding oxygen sensor output voltage value range is 0.62V to 1.18V.

[0022]

[0023] Where: Co—liquid metal oxygen concentration (wt%);

[0024] E—theoretical output voltage value of oxygen sensor with reference electrode Pt / Air (V);

[0025] T—Liquid metal temperature (T).

[0026] like Figure 3 As shown in the figure, the oxygen sensor error analysis method developed so far generally evaluates the accuracy of the liquid metal oxygen concentration sensor by comparing the oxygen saturation output voltage measured by the oxygen sensor in the Pb / PbO oxygen saturation state with the theoretical reference potential value. For liquid metal, the theoretical saturated oxygen potential value in the oxygen saturation state is linearly related to the temperature. Taking liquid lead-bismuth alloy as an example, for an oxygen sensor with a reference electrode of Pt / Air, the theoretical saturated oxygen potential value range in the Pb / PbO oxygen saturation state is 0.62 to 0.85V in the range of 200℃-600℃. If the voltage measurement value of the oxygen sensor in the Pb / PbO oxygen saturation state is compared and analyzed with the theoretical reference value, only the output error of the oxygen sensor in the range of 0.62 to 0.85V can be obtained. In the range of 200℃-600℃, the theoretical saturated oxygen potential value range of Ni / NiO in oxygen saturated state is: 0.80~0.99V; the theoretical saturated oxygen potential value range of Fe / Fe3O4 in oxygen saturated state is: 1.05~1.22V.

[0027] E Pb / PbO =1.1276-5.8568×10-4 T (2)

[0028] E Ni / NiO =1.2275-4.9151×10 -4 T (3)

[0029]

[0030] Where: E—the theoretical output voltage value of the oxygen sensor with reference electrode Pt / Air (V);

[0031] T—Liquid metal temperature (K).

[0032] According to the oxide free energy diagram in liquid metal (lead, lead-bismuth alloy), the standard Gibbs free energy of metal oxide formation in liquid metal ΔG 0 The smaller the value, the easier it is to react under standard conditions, the more stable the oxide generated is, and the more difficult it is to be reduced by other elements; conversely, the easier it is to be reduced by other elements. If Ni and Fe are added in order to the liquid metal in the PbO oxygen-saturated state, NiO and Fe3O4 can be generated in sequence through reduction reaction. Therefore, by measuring the output voltage of the oxygen sensor in the Ni / NiO and Fe / Fe3O4 oxygen-saturated states and comparing it with the theoretical saturation potential value, the error analysis range of the liquid metal oxygen sensor can be expanded from 0.62~0.85 to 0.62~1.22V.

[0033] A wide-range liquid metal oxygen concentration sensor error analysis device comprises a ceramic inner cylinder for loading, a gas pipe for ventilating the ceramic inner cylinder, a heating plate for heating the ceramic inner cylinder, an instrument tube for monitoring relevant data of the ceramic inner cylinder, and a metal adding mechanism for adding metal additives to the ceramic inner cylinder, wherein the metal adding mechanism comprises a first adding mechanism and a second adding mechanism for adding the Ni block and the Fe block respectively.

[0034] Preferably, the gas pipe includes a first gas pipe for air intake and a second gas pipe for air exhaust; the instrument pipe includes an oxygen concentration sensor pipe, a liquid level meter pipe and a first thermocouple pipe.

[0035] Preferably, the first adding mechanism and the second adding mechanism include a hanging basket for adding metal additives and a rotating handle cover for controlling the lifting of the hanging basket, and the hanging basket is provided with a loading port for loading materials.

[0036] Preferably, it also includes a thrust sleeve for rotatably connecting the rotating handle cover, the rotating handle cover is connected to a guide block, and the guide block is provided with a bellows for connecting the hanging basket.

[0037] Preferably, it also includes a sealing shell for sealing the ceramic inner cylinder, a support for supporting the ceramic inner cylinder and a second thermocouple tube for measuring the wall temperature of the ceramic inner cylinder; the sealing shell is provided with a sealing shell flange cover, and the metal adding mechanism, the oxygen concentration sensor tube, the liquid level meter tube and the first thermocouple tube pass through the sealing shell flange cover; the first adding mechanism and the second adding mechanism are respectively provided with a first adding flange cover and a second adding flange cover.

[0038] By adopting the technical solution, Ni and Fe additives are added to the ceramic inner cylinder in sequence through the first adding mechanism and the second adding mechanism in a sealed state, and the error analysis method is combined to better meet the needs of the error analysis process. The device has the advantages of wide measurement range, good sealing performance, accurate positioning, convenient disassembly and assembly, etc., and can meet the error analysis and accuracy evaluation of liquid metal oxygen concentration sensors within a wide measuring range.

[0039] The technical solution of the embodiment of the present invention has at least the following advantages and beneficial effects:

[0040] 1. The present invention can expand the error analysis range of the liquid metal oxygen sensor from 0.62 to 0.85 V to 0.62 to 1.22 V;

[0041] 2. The present invention can improve the applicability of error analysis while broadening the analytical range, and is helpful to calibrate the accuracy of the liquid metal oxygen concentration sensor within a wide range;

[0042] 3. The device of the present invention has the advantages of wide measuring range, good sealing performance, accurate positioning, convenient disassembly and assembly, etc., which can meet the error analysis and accuracy evaluation of liquid metal oxygen concentration sensors within a wide measuring range. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0044] Figure 1 A schematic flow chart of an error analysis method for a wide-range liquid metal oxygen concentration sensor provided in Example 1 of the present invention;

[0045] Figure 2 A graph showing the relationship between the output voltage value of the liquid lead-bismuth Pt / Air oxygen sensor provided in Example 1 of the present invention and the liquid metal oxygen concentration and temperature value;

[0046] Figure 3A diagram of the theoretical oxygen saturation voltage range provided by the present invention;

[0047] Figure 4 A comparison diagram of the oxygen saturation voltage range diagram provided in Example 1 of the present invention and the theoretical oxygen saturation voltage range diagram;

[0048] Figure 5 A schematic structural diagram of a wide-range liquid metal oxygen concentration sensor error analysis device provided in Example 2 of the present invention;

[0049] Figure 6 This is a structural schematic diagram of the metal adding mechanism of the wide-range liquid metal oxygen concentration sensor error analysis device provided in Example 2 of the present invention.

[0050] Icons: 1a, first adding mechanism; 1b, second adding mechanism; 11, heating plate; 12, check valve; 12a, sealing shell flange cover; 12b, first adding flange cover; 12c, second adding flange cover; 13a, rotating handle cover; 13b, bellows; 13c, charging port; 13d, thrust sleeve; 13e, guide block; 13f, hanging basket; 2, sealing shell; 21, first water intake point; 22, second water intake point; 23, first liquid level alarm point; 24, second liquid level alarm point; 3, ceramic inner cylinder; 4, support; 5, drain port; 6, oxygen concentration sensor pipe connection; 7, liquid level gauge pipe connection; 8, first thermocouple pipe connection; 9a, first gas pipe; 9b, second gas pipe; 10, second thermal couple pipe connection. DETAILED DESCRIPTION

[0051] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be described clearly and completely below. If the specific conditions are not specified in the embodiments, they are carried out according to conventional conditions or conditions recommended by the manufacturer. If the manufacturer of the reagents or instruments used is not specified, they are all conventional products that can be purchased commercially.

[0052] Example 1

[0053] A wide-range liquid metal oxygen concentration sensor error analysis method comprises the following steps:

[0054] S1: Loading:

[0055] S2: Melting:

[0056] S3: Warming up:

[0057] S4: Establishment of the initial oxygen saturation state of the liquid metal: introducing an oxidizing gas into the ceramic inner tube 3, and then introducing argon gas to establish a Pb / PbO equilibrium state;

[0058] S5: Pb / PbO saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature at a cooling rate of ≤6°C / h, and obtain the Pb / PbO stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures;

[0059] S6: Establishment of Ni / NiO balance: The liquid metal in the ceramic inner cylinder 3 is heated to the highest test temperature, and a Ni block is added to establish a Ni / NiO balance to obtain a stable output signal of the liquid metal oxygen concentration sensor;

[0060] S7: Ni / NiO saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature at a cooling rate of ≤6°C / h, and obtain the Ni / NiO stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures;

[0061] S8: Establishment of Fe / Fe3O4 equilibrium: the liquid metal in the ceramic inner cylinder 3 is heated to the highest test temperature, and Fe blocks are added to establish Fe / Fe3O4 equilibrium, and a stable output signal of the liquid metal oxygen concentration sensor is obtained;

[0062] S9: Fe / Fe3O4 saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature at a cooling rate of ≤6℃ / h, and obtain the Fe / Fe3O4 stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures.

[0063] In this embodiment, for the lead-bismuth alloy ingot, the maximum test temperature and the minimum test temperature are 600° C. and 200° C. respectively.

[0064] In this embodiment, the step S1 includes the following specific steps: adding metal ingots into the ceramic inner tube 3, and adding Ni blocks and Fe blocks into the metal adding mechanism respectively.

[0065] In this embodiment, in step S2, the metal ingot in the ceramic inner tube 3 is heated to melt, and a liquid metal oxygen concentration sensor, a liquid level meter and a thermocouple are installed to the same height 20 mm below the liquid metal surface.

[0066] In this embodiment, in step S3, the temperature of the liquid metal in the ceramic inner tube 3 is raised to the highest test temperature, and an argon-hydrogen mixed gas is introduced to reduce the oxide impurities in the liquid metal.

[0067] In this embodiment, in step S4, an oxidizing gas is introduced into the ceramic inner tube 3, and after the sensor output is stabilized within the range of ±10 mV, argon gas is introduced to establish a Pb / PbO equilibrium state.

[0068] In the range of 200°C-600°C, the theoretical saturated oxygen potential value range of Ni / NiO in the oxygen saturated state is: 0.80~0.99V; the theoretical saturated oxygen potential value range of Fe / Fe3O4 in the oxygen saturated state is: 1.05~1.22V.

[0069] E Pb / PbO =1.1276-5.8568×10 -4 T (2)

[0070] E Ni / NiO =1.2275-4.9151×10 -4 T (3)

[0071]

[0072] Where: E—the theoretical output voltage value of the oxygen sensor with reference electrode Pt / Air (V);

[0073] T—Liquid metal temperature (K).

[0074] According to the oxide free energy diagram in liquid metal (lead, lead-bismuth alloy), the standard Gibbs free energy of metal oxide formation in liquid metal ΔG 0 The smaller the value, the easier it is to react under standard conditions, the more stable the oxide generated is, and the more difficult it is to be reduced by other elements; conversely, the easier it is to be reduced by other elements. If Ni and Fe are added in order to the liquid metal in the PbO oxygen-saturated state, NiO and Fe3O4 can be generated in sequence through reduction reaction. Therefore, by measuring the output voltage of the oxygen sensor in the Ni / NiO and Fe / Fe3O4 oxygen-saturated states and comparing it with the theoretical saturation potential value, the error analysis range of the liquid metal oxygen sensor can be expanded from 0.62~0.85 to 0.62~1.22V.

[0075] like Figure 4 As shown, according to the comparison with the theoretical saturation potential, the linear fitting curve obtained in the test of this embodiment is more linear than the theoretical saturation potential, R 2 The value is greater than 99.97%.

[0076] Example 2

[0077] A wide-range liquid metal oxygen concentration sensor error analysis device comprises a ceramic inner cylinder 3 for loading, a gas pipe for ventilating the ceramic inner cylinder 3, a heating plate 11 for heating the ceramic inner cylinder 3, an instrument tube for monitoring relevant data of the ceramic inner cylinder 3 and a metal adding mechanism for adding metal additives to the ceramic inner cylinder 3, wherein the metal adding mechanism comprises a first adding mechanism 1a and a second adding mechanism 1b for adding the Ni block and the Fe block respectively.

[0078] In this embodiment, the gas pipe includes a first gas pipe 9a for air intake and a second gas pipe 9b for exhaust; the instrument pipe includes an oxygen concentration sensor pipe 6, a liquid level meter pipe 7 and a first thermocouple pipe 8.

[0079] In this embodiment, the first adding mechanism 1a and the second adding mechanism 1b include a hanging basket 13f for adding metal additives and a rotating handle cover 13a for controlling the lifting of the hanging basket 13f. The hanging basket 13f is provided with a loading port 13c for loading materials.

[0080] In this embodiment, it also includes a thrust sleeve 13d for rotatably connecting the rotating handle cover 13a. The rotating handle cover 13a is connected to a guide block 13e. The guide block 13e is provided with a bellows 13b for connecting the hanging basket 13f.

[0081] In this embodiment, it also includes a sealing shell 2 for sealing the ceramic inner cylinder 3, a support 4 for supporting the ceramic inner cylinder 3 and a second thermocouple tube 10 for measuring the wall temperature of the ceramic inner cylinder 3; the sealing shell 2 is provided with a sealing shell flange cover 12a, and the metal adding mechanism, the oxygen concentration sensor tube 6, the liquid level meter tube 7 and the first thermocouple tube 8 pass through the sealing shell flange cover 12a; the first adding mechanism 1a and the second adding mechanism 1b are respectively provided with a first adding flange cover 12b and a second adding flange cover 12c.

[0082] By adopting the technical solution, Ni and Fe additives are sequentially added into the ceramic inner tube 3 through the first adding mechanism 1a and the second adding mechanism 1b in a sealed state, and the error analysis method is combined to better meet the requirements of the error analysis process. The device has the advantages of wide measuring range, good sealing performance, accurate positioning, convenient disassembly and assembly, etc., and meets the error analysis and accuracy evaluation of liquid metal oxygen concentration sensors within a wide measuring range.

[0083] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A wide-range liquid metal oxygen concentration sensor error analysis method, characterized in that: By sequentially measuring the output voltage of oxygen sensors under Ni / NiO and Fe / Fe3O4 oxygen saturation conditions, the error analysis range of liquid metal oxygen sensors is broadened, which specifically includes the following steps: S1: Establishment of the initial oxygen saturation state of the liquid metal: introducing an oxidizing gas into the molten container, and then introducing an inert gas to establish a Pb / PbO equilibrium state; S2: Pb / PbO saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature to obtain the Pb / PbO stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures; S3: Establishment of Ni / NiO equilibrium: The liquid metal in the molten container is heated to the highest test temperature, and a Ni block is added to establish Ni / NiO equilibrium, and a stable voltage signal output by the liquid metal oxygen concentration sensor is obtained; S4: Ni / NiO saturated oxygen potential acquisition: cool the liquid metal to the lowest test temperature to obtain the Ni / NiO stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures; S5: Establishment of Fe / Fe3O4 equilibrium: The liquid metal in the molten container is heated to the highest test temperature, and Fe blocks are added to establish Fe / Fe3O4 equilibrium, and a stable voltage signal output by the liquid metal oxygen concentration sensor is obtained; S6: Fe / Fe3O4 saturated oxygen potential acquisition: Cool the liquid metal to the lowest test temperature to obtain the Fe / Fe3O4 stable voltage signal output by the liquid metal oxygen concentration sensor at different temperatures.

2. The error analysis method of a wide-range liquid metal oxygen concentration sensor according to claim 1, characterized in that: Before the step S1, the following specific steps are also included: charging: adding Ni blocks and Fe blocks to the metal adding mechanism respectively.

3. The error analysis method of a wide-range liquid metal oxygen concentration sensor according to claim 1, characterized in that: Before step S1, after loading, the following specific steps are also included: Melting: heating the metal ingot in the melting container until it is melted, and loading the liquid metal oxygen concentration sensor, liquid level meter and thermocouple to below the liquid metal surface.

4. The error analysis method of a wide-range liquid metal oxygen concentration sensor according to claim 1, characterized in that: Before the step S1, the following specific steps are also included after melting: Heating: heating the liquid metal in the ceramic inner tube to the highest test temperature, and introducing a mixed gas of inert gas and hydrogen to reduce the oxide impurities in the liquid metal.

5. The error analysis method of a wide-range liquid metal oxygen concentration sensor according to claim 1, characterized in that: In the step S1, an oxidizing gas is introduced into the melting container, and after the sensor output is stabilized within the range of ±10 mV, argon gas is introduced to establish a Pb / PbO equilibrium state.

6. A wide-range liquid metal oxygen concentration sensor error analysis device for use in the error analysis method according to any one of claims 1 to 5, characterized in that: The invention comprises a ceramic inner cylinder (3) for loading materials, a gas pipe for ventilating the ceramic inner cylinder (3), a heating plate (11) for heating the ceramic inner cylinder (3), an instrument pipe for monitoring relevant data of the ceramic inner cylinder (3), and a metal adding mechanism for adding metal additives to the ceramic inner cylinder (3), wherein the metal adding mechanism comprises a first adding mechanism (1a) and a second adding mechanism (1b) for adding the Ni block and the Fe block respectively.

7. The wide-range liquid metal oxygen concentration sensor error analysis device according to claim 6, characterized in that: The gas pipe comprises a first gas pipe (9a) for air intake and a second gas pipe (9b) for air exhaust; the instrument pipe comprises an oxygen concentration sensor pipe (6), a liquid level meter pipe (7) and a first thermocouple pipe (8).

8. The wide-range liquid metal oxygen concentration sensor error analysis device according to claim 7, characterized in that: The first adding mechanism (1a) and the second adding mechanism (1b) comprise a hanging basket (13f) for adding metal additives and a rotating handle cover (13a) for controlling the lifting and lowering of the hanging basket (13f); the hanging basket (13f) is provided with a loading port (13c) for loading materials.

9. The wide-range liquid metal oxygen concentration sensor error analysis device according to claim 8, characterized in that: It also includes a thrust sleeve (13d) for rotatably connecting the rotating handle cover (13a), the rotating handle cover (13a) is connected to a guide block (13e), and the guide block (13e) is provided with a bellows (13b) for connecting the hanging basket (13f).

10. A wide-range liquid metal oxygen concentration sensor error analysis device according to any one of claims 7 to 9, characterized in that: The invention also comprises a sealing shell (2) for sealing the ceramic inner cylinder (3), a support member (4) for supporting the ceramic inner cylinder (3) and a second thermocouple tube (10) for measuring the wall temperature of the ceramic inner cylinder (3); the sealing shell (2) is provided with a sealing shell flange cover (12a), and the metal adding mechanism, the oxygen concentration sensor tube (6), the liquid level meter tube (7) and the first thermocouple tube (8) pass through the sealing shell flange cover (12a); the first adding mechanism (1a) and the second adding mechanism (1b) are provided with a first adding flange cover (12b) and a second adding flange cover (12c), respectively.

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