Detachable High Voltage Multipoint Flexible Thermocouple

Abstract

The invention relates to a high-pressure resistant split type multi-point flexible armored thermocouple, in particular to a split type, non-welded, detachable, high-pressure multi-point flexible thermocouple suitable for high-pressure hydrocracking reactors. It also involves the different materials of the flange material and the multi-point flexible thermocouple sleeve, which solves the disadvantage of the hydrogen-catalyzed fracture of the flexible thermocouple caused by the welding of the hydrogen interface of the flange. The cost overcomes the requirement that the material of the flange and the thermocouple casing must be the same due to the welding process of the multi-point flexible thermocouple, and the same material is easy to weld.

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 weld hardness, etc., resulting in small diameter The brittleness of the thin-walled armored protective tube increases, causing problems such as easy fracture and cracking due to hydrogen corrosion resistance, which brings great disadvantages to transportation, installation and service life

Especially for a single-tube multi-point thermocouple as an example, if the casing at the root of the flange is cracked or broken during transportation and installation, or if one or two points are damaged after operation, it is very difficult to repair, and it is necessary to Replace the whole product, causing serious waste

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