On-line replaceable thermocouples for sulfur furnace temperature measurement

Abstract

The invention relates to an on-line replaceable thermocouple used for measuring the temperature of a sulfur furnace, including a thermocouple and a protective sleeve outside the thermocouple, and the thermocouple with the protective sleeve measures temperature through the thermocouple installed on the sulfur furnace. The support pipe extends into the sulfur furnace, and the side of the temperature-measuring support pipe is provided with a first blowing interface and a second blowing interface which are spaced apart from each other. One end of the first and second blowing interfaces communicates with the temperature-measuring support pipe. The other end of the first and second blowing ports is connected to the protective gas source, the rear end of the thermocouple is connected to the junction box, the junction box is sealed with the temperature measurement support tube, and the temperature measurement support tube between the protective sleeve and the junction box A micro-pressure pressure gauge is installed on the top, and the rear end of the temperature-measuring support tube is provided with a rotary valve capable of closing the temperature-measuring support tube. The invention can effectively avoid the leakage and leakage of hydrogen sulfide gas, prolong the service life of thermocouples, improve the accuracy of temperature measurement, and replace the thermocouples without shutting down the furnace, thereby prolonging the operating period of the device and greatly improving the production efficiency.

Description

technical field [0001] The invention relates to a thermocouple, in particular to an on-line replaceable thermocouple used for measuring the temperature of a sulfur furnace. Background technique [0002] Sulfur recovery unit 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, thus avoiding refining The process causes environmental pollution due to the discharge of acid gas. Sulfur furnaces include petrochemical acid gas sulfur incinerators, sulfur tail gas recovery heating furnaces and sulfur tail gas incinerators. The sulfur furnace is the core equipment of the entire sulfur recovery unit. The temperature of the furnace is very high, usually 1200-1450 °C, the highest can reach 1500 °C, and sometimes the temperature can reach as high as 1600 °C when the e...

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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