Pyrolysis furnace COT thermocouple anti-degrading and anti-coking sleeve pipe

Abstract

The invention provides a COT thermocouple anti-scour and anti-coking sleeve used in a cracking furnace. The sleeve comprises a thermocouple, a terminal block, a lower protecting tube, a process connecting flange, an upper protecting tube and a measuring terminal, an internal leakage resistant device is arranged between the upper protecting tube and the process connecting flange, the measuring terminal is provided with a temperature measuring head and an anti-scour body having a prismatic inclined scour plane, the anti-scour body is arranged into a whole part with the temperature measuring head through connection, the temperature measuring head is connected with the back of the anti-scour body, a projection plane of the temperature measuring head which is perpendicular to the back of the anti-scour body is smaller than the back of the anti-scour body, the prismatic inclined scour plan of the anti-scour body is coated with multi-layer composite materials, a temperature measuring terminal is in seal welding with the lower protecting tube, and a protective layer is arranged at the welding position. The provided technical proposal has good temperature measurement sensitivity, and can achieve good effects of high temperature resistance, scour resistance, coking resistance, seismic resistance, internal leakage resistance and the like.

Description

technical field [0001] The invention relates to an instrument for measuring the outlet temperature of a cracking furnace radiation furnace tube. Background technique [0002] The temperature measurement at the radiation outlet of the pyrolysis furnace requires the thermocouple to be able to quickly respond to the potential and accurately measure the temperature, and the measurement end is required to be wear-resistant. The existing instrument manufacturing method is to increase the thickness of the casing to achieve wear resistance, but The thickening of the casing will cause the temperature of the thermocouple to lag and the sensitivity will be reduced. Therefore, increasing the thickness of the casing can only achieve the anti-scouring effect, but cannot achieve accurate temperature measurement, resulting in a large actual and measurement error. [0003] Patent No. 01254427.2 proposes a prismatic anti-scouring thermometer sleeve, the measuring end is provided with an anti-...

AI Technical Summary

Problems solved by technology

This technical solution directly connects the junction box to the process connection flange through a protective tube with a slipknot, but the thermocouple with such a structure cannot guarantee that the fluid medium will leak to the connection end at the junction box after long-term use

In addition, there is a gap between the protection tube and the equipment connection tube. During the use of the product, the fluid medium is easy to penetrate into the gap, and when the protection tube and the equipment connection tube vibrate synchronously, the instrument is easy to be damaged.

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