Preparation method of heating furnace sealing material for zirconia oxygen analyzer

Abstract

The invention provides a preparation method of a heating furnace sealing material of a zirconia oxygen analyzer. The preparation method comprises the following steps: (1) preparing a liquid material of the sealing material, wherein the liquid material comprises a waterborne high-temperature insulating coating capable of withstanding a high temperature of 1250 DEG C for a long period of time; (2) preparing a solid material of the sealing material, wherein the solid material comprises sericite powder; and (3) mixing the liquid material with the solid material so as to form the sealing material.The heating furnace sealing material has high-temperature insulation performance, the waterborne high-temperature insulating coating is used as a binder of the heating furnace sealing material, and the sericite powder which is used as a main material can provide water isolation, gas barrier and insulation performance; and the prepared sealing material has good high-temperature stability, no chemical change at high temperature and no large physical change, and has no risk of deformation or cracking at the sealing position due to long-term use at high temperature, so that the service life of a heating furnace is prolonged greatly.

Description

technical field [0001] The invention relates to a sealing material for an oxygen analyzer heating furnace, in particular to a preparation method of the sealing material. Background technique [0002] At present, the zirconia oxygen analyzer is the most practical measuring instrument for the oxygen contained in the industrial flue gas, 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 the zirconia ceramic element. When the oxygen content on both sides of the core zirconia element electrode of the probe is not equal at high temperature, an oxygen concentration potential will be formed, and the relationship between its size and the oxygen concentration is consistent with Nernst. Formula E=0.0496Tlg(P 0 / P x )+C (where E is the battery electromotive force; T is the working temperature, generally 700℃-800℃, P 0 For the reference side oxygen content, the air oxygen cont...

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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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