Online operation exchangeable thermocouple for testing temperature of sulphur furnace

Abstract

The invention relates to an online operation exchangeable thermocouple for testing the temperature of a sulphur furnace. The thermocouple includes a thermocouple and a protection bushing which sleevesthe thermocouple. The thermocouple which has the protection bushing extends into a sulphur furnace through a temperature testing support pipe which is installed in the sulphur furnace. The side surface of the temperature testing support pipe is provided with a first blowing interface and a second blowing interface which are disposed at intervals in front-rear direction. One ends of the first blowing interface and the second blowing interface are in communication with the temperature testing support pipe, and the other ends are connected a protection gas source. The rear end of the thermocouple is connected to a junction box which is in tight coupling with the temperature testing support pipe. The temperature testing support pipe between the protection bushing and the junction box is provided with a micropressure pressure gage thereon. The rear end of the temperature testing support pipe is provided with a rotary valve which can block the temperature testing support pipe. According tothe invention, the thermocouple can effectively prevent permeation and leakage of sulfuretted hydrogen, prolongs service life of thermocouple, increases accuracy in testing temperature, and since thethermocouple obviates the need for suspending the work of the furnace for exchanging the thermocouple, the operation period is prolonged and the production efficiency is greatly increased.

Description

Technical field [0001] The invention relates to a thermocouple, in particular to an on-line operation replaceable thermocouple used for temperature measurement of a sulfur furnace. Background technique [0002] Sulfur recovery equipment is an important and indispensable environmental protection device in all oil refining equipment. It has been widely used in natural gas purification plants and coal gasification processes. Through it, sulfur in crude oil can be recovered and sulfur products can be generated, thereby avoiding refining Environmental pollution caused by the discharge of acid gas during the process. Sulfur furnaces include petrochemical acid gas sulfur incinerators, sulfur tail gas recovery heating furnaces and sulfur tail gas incinerators. Sulfur furnace is the core equipment of the entire sulfur recovery unit. Its furnace temperature is very high, usually 1200~1450℃, and the highest temperature can reach 1500℃. Sometimes the temperature can reach 1600℃ when the equ...

AI Technical Summary

Problems solved by technology

[0006] At present, ordinary thermocouples are used to measure the furnace temperature of sulfur furnaces, mainly encountering the following difficulties: the service life of thermocouples is short, and sometimes the thermocouples just replaced are damaged within a few hours, and the use time is only half a year at most; If non-metallic materials such as corundum sleeve, quartz tube or silicon carbide tube are used, the resistance to rapid cooling and heat is poor, and they are easy to crack and break; It will enter the junction box along the casing. Once the junction box is corroded, hydrogen sulfide will leak to the site. In extreme cases, hydrogen sulfide will leak to the control room along the cable, endangering the safety of on-site personnel.

[0007] Therefore, for a long time, the measurement of the furnace temperature of the sulfur furnace has been a difficult problem in the industry, and considering the impact of hydrogen sulfide gas leakage and leakage, it is impossible to replace the thermocouple when the sulfur recovery device is running online, which will affect the device. Cycle Time and Productivity

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