Integrated sealed liquid lead bismuth alloy oxygen concentration sensor

Abstract

The invention discloses an integrated sealed liquid lead bismuth alloy oxygen concentration sensor which mainly comprises a signal unit, an instrument supporting unit and a core oxygen measuring element. A solid oxide electrolyte ceramic probe provided with a reference electrode in the core oxygen measuring element is fixedly arranged in a protective steel sleeve; the protective steel sleeve is mechanically connected with a stainless steel supporting cylinder; the lower end part of an electrode wire is inserted into the reference electrode, and the upper end of the electrode wire is connected with a signal quick connector which is connected with the positive electrode of the signal unit through a connecting wire; the upper end of the stainless steel supporting cylinder is mechanically sealed by a stainless steel sealing outer connector thread of an insulating end socket, one end of the stainless steel sealing outer connector is connected with the cathode of an electromotive force signal display instrument through a signal connecting wire, and the other end of the stainless steel sealing 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 visually obtains the electromotive force, and the oxygen concentration in the liquid lead-bismuth alloy is solved according to the relational expression of the electromotive force and the oxygen concentration.

Description

technical field [0001] The invention relates to the field of oxygen concentration sensors for fourth-generation nuclear reactor lead-based coolants, in particular to an integrated sealed type liquid lead-bismuth alloy oxygen concentration sensor. Background technique [0002] Liquid lead-bismuth alloy, which is the preferred material for spallation targets in lead-based fast reactor coolants and accelerator-driven subcritical systems of fourth-generation reactors, is highly corrosive 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 the liquid lead-bismuth alloy to iron-based metal materials will be accelerated, and if the oxygen concentration is too high, the oxide of the liquid lead-bismuth alloy will be polluted. Studies have shown that the oxygen concentration in liquid lead-bismuth alloys at different temperatures has a region where oxygen will form a ...

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Problems solved by technology

[0002] Liquid lead-bismuth alloy, which is the preferred material for spallation targets in lead-based fast reactor coolants and accelerator-driven subcritical systems of fourth-generation reactors, is highly corrosive to reactor structural materials at high temperatures, and its corrosiveness is affected by oxygen concentration. If the oxygen concentration is too low, it will accelerate the corrosion of the liquid lead-bismuth alloy on iron-based metal materials, and if the oxygen concentration is too high, it will cause the pollution of the oxide of the liquid lead-bismuth alloy itself.

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