Detachable high pressure resistant multipoint flexible thermocouple

Abstract

The invention relates to a high pressure resistant split multipoint flexible sheathed thermocouple, in particular to a split, weldless and detachable high pressure resistant multipoint flexible thermocouple suitable for a high-pressure hydrocracking reactor. A flange and a multipoint flexible thermocouple well are different in material, so that the problem that hydrogen embrittlement fracture can be easily caused to the flexible thermocouple due to the welding reason of a hydro interface of the flange is solved. Meanwhile, the flexible thermocouple is convenient to disassemble and replace when overhauling is performed, so that the use cost is reduced, and the problems that the cost is high and the complete set needs to be replaced when maintenance and replacement are performed under the requirement that the flange and the multipoint flexible thermocouple well have to be consistent in material by adopting a welding process of the multipoint flexible sheathed thermocouple because the same material is easy for welding are solved.

Description

technical field [0001] The invention belongs to thermocouples, in particular to a detachable high-voltage multi-point flexible thermocouple. Background technique [0002] There are many reactors in the production process of oil refining and chemical industry, especially in high-pressure hydrogenation and hydrocracking reactors, the working temperature is above 600 ℃, and the working pressure is about 20Mpa. Ultra-high pressure, high temperature and multi-point flexible thermocouples are particularly important. The reactant flow enters from the top of the reactor, and under the action of the catalyst, a chemical reaction occurs between the materials and heat is released, so there is a catalyst bed temperature rise along the reactor axis. When the catalyst bed inlet distributor is poorly designed, part of the catalyst bed structure is damaged, or there is a large change in process conditions, the temperature at different positions on a certain cross-section of the bed may also...

AI Technical Summary

Problems solved by technology

Since the bottom surface of the high-pressure flange in contact with the medium is often a hydrogen interface, the small-diameter, thin-walled armored protection tube and the large-diameter and thick high-pressure flange surface are formed by welding, because the wall thickness difference between the weldments is particularly large , the welding melting point is inconsistent, not only the welding technology requirements are particularly high, but also welding quality problems such as weld structure and heat-affected zone grains caused by the welding process are coarse or uneven, residual stress due to high w

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