Safety protection type liquid metal oxygen sensor

Abstract

The invention discloses a safety protection type liquid metal oxygen sensor. The structural design, the protection circuit design and the like of a ceramic tube protective cover are utilized, active protection is carried out on the integrity of the weak part-ceramic tube of an oxygen sensor, the fracture condition is monitored in real time, isolation measures are taken in time to deal with safety risks, and safety accidents and the like caused by leakage are avoided from the two aspects of active defense and risk dealing. The ceramic tube protective cover adopts a streamline staggered design so that the impact damage effect of high-speed flowing liquid metal on the ceramic tube is prevented. Under the extreme accident working condition that the ceramic tube is broken, the high-pressure liquid metal enters the ceramic tube part, the protection circuit is switched on, a warning lamp used for leakage accident warning is lightened, meanwhile, an electromagnet starts to work, the protective cover moves under the action of electromagnetic force and isolates the ceramic tube from the external liquid metal, and therefore, the safety risk that high-temperature and high-pressure liquid metal upwells through the broken ceramic tube and is jetted to an external area is prevented.

Description

technical field [0001] The invention relates to the field of sensors, in particular to an oxygen sensor with safety protection performance used in liquid metal. Background technique [0002] As one of the main candidate coolants for fourth-generation nuclear energy systems, liquid metals have been widely studied worldwide, such as sodium metal as a coolant for sodium-cooled fast reactors, lead / lead-bismuth alloys as coolant materials for lead-based reactors, The research on key technologies of related coolants has laid the foundation for the application of liquid metals. Among them, the coolant chemical process, as a key technology, requires effective control of the chemical composition of the coolant, especially the control of the dissolved oxygen concentration of the coolant sodium, lead, lead-bismuth alloy and the composition of oxide impurities. The premise of realizing oxygen concentration control is accurate measurement of oxygen concentration. The oxygen sensor probe...

AI Technical Summary

Problems solved by technology

The premise of realizing oxygen concentration control is accurate measurement of oxygen concentration. The oxygen sensor probe used in the current development of oxygen measurement technology is zirconia-doped ceramics. There is a risk of signal failure due to impact cracking in the high-temperature and high-flow rate coolant working environment. , and there is a probability of high-temperature liquid metal splashing, leakage and corresponding accidents (such as sodium fire, explosion, etc.) due to ceramic rupture

[0003] At present, the research and development of oxygen sensors for coolants in the world mainly focuses on the accuracy and stability of the signal, and there are few reports on the design of safety and blocking accident risks.

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