Zirconium oxide oxygen analyzer heating furnace

Abstract

The invention provides a zirconium oxide oxygen analyzer heating furnace. The zirconium oxide oxygen analyzer heating furnace comprises a furnace core tube, a first end plate, a second end plate and aconnecting rod piece, wherein a heating wire is arranged in the furnace core tube and is used for heating a zirconium oxide oxygen sensitive element positioned in an inner cavity of the furnace coretube; the first end plate is used for supporting a first end part of the furnace core tube; the second end plate is used for supporting a second end part of the furnace core tube; the connecting rod piece is used for fastening the first end plate and the second end plate together, so that the furnace core tube is clamped between the first end plate and the second end plate. A heating cavity of theheating wire of the furnace core tube provided with the heating wire is filled with a filling material, the first end part and the second end part of the furnace core tube are sealed through a sealing material, the filling material and the sealing material are all prepared by mixing a liquid material and a solid material, the liquid material comprises a water-based high-temperature insulating coating capable of resisting high temperature of 1250 DEG C or above for a long time, and the solid material comprises sericite powder. The adopted filling material and sealing material have long-time high-temperature stability, the chemical and physical changes are not easy to occur, and the service life of the heating furnace is prolonged.

Description

technical field [0001] This invention relates to oxygen analyzers, and more particularly to such furnaces for zirconia-based oxygen analyzers. Background technique [0002] At present, the zirconia oxygen analyzer is the most practical instrument for measuring the oxygen contained in industrial fume oxygen, which is of great significance to the realization of energy saving and emission reduction. [0003] The core component of the zirconia oxygen analyzer probe is a zirconia ceramic element. When the oxygen content on both sides of the core zirconia element electrode of the probe is unequal at high temperature, an oxygen concentration potential will be formed. The relationship between its size and oxygen concentration conforms to Nernst Formula E=0.0496Tlg(P 0 / P x )+C (where E is the electromotive force of the battery; T is the working temperature, generally 700°C-800°C, P 0 As the reference side oxygen content, generally take the air oxygen content as 20.95%, P x is th...

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Problems solved by technology

However, the heating furnace tube in this arrangement is prone to deformation at high temperature for a long time, resulting in failure of the heating furnace tube

[0006] In addition, in view of the above-mentioned problem that the dust filled the core tube of the heating furnace, which caused serious burning of the furnace, the dark brown powder in the broken furnace was analyzed, and the results showed that In the dark brown powder, Cr (70%) and Ni (28%) are the main ones, and the rest are iron, manganese, silicon

The original furnace wire composition is mainly Cr(20%) and Ni(80%), indicating the loss of Cr in the furnace wire composition If it is greater than Ni, this will further lead to the thinning of the furnace wire and the acceleration of the oxidation reaction, thereby shortening the life. , and then change the location of the furnace wire, resulting in a local unit resistance change, which induces an increase in local power, resulting in hot spots until melting and fracture, and the furnace wire is blown

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