Cracking furnace COT thermocouple and mounting method thereof

Abstract

The invention discloses a cracking furnace COT thermocouple, which comprises a junction box, an upper protective tube, a leakproof sealing device, a connecting flange and a measuring end which are connected sequentially, wherein the parts are connected sequentially to form an inner cavity; a sheathed thermocouple is arranged in the inner cavity; the measuring end comprises a wear-resistant washing connecting sleeve and an induction end; the induction end comprises a protective body and a measuring head; the cracking furnace COT thermocouple is arranged in a mounting tube at the outlet of an ethylene cracking furnace; and a temperature measuring area is formed between the induction end and the inner wall of the mounting tube. Compared with the prior art, the cracking furnace COT has the characteristics of stable temperature measuring results of the thermocouple, high temperature measuring accuracy and long service life.

Description

technical field [0001] The invention relates to a thermocouple, in particular to a cracking furnace COT thermocouple and an installation method thereof. Background technique [0002] The cracking furnace COT thermocouple in the prior art generally adopts a structure in which an armored thermocouple is arranged in a protective tube. Two thermal electrode wires of different materials are arranged in the thermocouple, and the thermal electrode wires form an induction loop. When the cracking furnace COT thermocouple is used, the working end (hot end) of the protective tube is placed in the measurement medium, and the induction circuit is activated by the temperature difference between the working end (hot end) medium temperature and the measuring end (cold end) temperature. Inductive current is formed. The temperature of the medium can be tested through the induced current. It can be seen from the above structure and use process that the main function of induction is the ther...

AI Technical Summary

Problems solved by technology

However, the existing products all have the disadvantages of insufficient temperature measurement sensitivity, poor stability and short service life.

In order to solve the above problems, the diameter of the thermal electrode wire can be simply increased, but because in this industry, the diameter of the armored thermocouple protection tube is standard and fixed, and the wall thickness of the protection tube must also be adjusted according to the standard. Manufacturing, that is to say, the inner diameter of the protection tube cannot be expanded with the increase of the thermode wire. In this case, increasing the diameter of the thermode wire will reduce the insulation distance in the protection tube, resulting in The insulation effect is not good; if the number of measuring thermocouples is increased, the overall structure of the cooperating equipment will be destroyed, resulting in an increase in system cost, making the solution unrealizable

Images