Method for distinguishing temperature of outer wall of cracking furnace tube from temperature of inner wall of hearth and measurement device

Abstract

The invention provides a method for distinguishing the temperature of the outer wall of a cracking furnace tube from the temperature of the inner wall of a hearth and a measurement device. When the temperature of the outer wall of the cracking furnace tube is measured through a temperature measurement module, the distance of a practical temperature measurement object is synchronously measured through a distance measurement module, and either the measured temperature is the temperature of the outer wall of the cracking furnace tube or the temperature of the inner wall of the hearth is distinguished according to the measured distance. By means of the method and the measurement device, the temperature and the distance of the practical temperature measurement object can be synchronously measured in the severe production environment of a cracking furnace, the temperature of the outer wall of the cracking furnace tube and the temperature of the inner wall of the hearth are effectively and rapidly distinguished through different distance features of the temperature-measured object, and the implementation device for the method is simple in structure, easy to implement and low in manufacturing cost.

Description

technical field [0001] The invention relates to the field of petrochemical industry, in particular to a temperature screening method and measuring device for the outer wall of a cracking furnace tube and the inner wall of a furnace. Background technique [0002] The ethylene industry is an important substrate in the petrochemical industry, and the cracking process is one of the key technologies in the ethylene industry. At present, more than 99% of my country's ethylene production uses tube furnace steam pyrolysis technology, and the operating status of the cracking furnace directly affects the yield and quality of ethylene. In the cracking furnace, the furnace tube is the key component, which plays the role of heating the raw material and the reactor. Since the furnace tube of the cracking furnace operates in a high-temperature complex environment for a long time, it is prone to surface oxidation, coking caused by corrosion, local over-temperature, etc., as well as phase c...

AI Technical Summary

Problems solved by technology

[0005] 1. The fire viewing hole is small, and the range of furnace tubes and furnaces that can be clearly observed is very limited;

[0006] 2. The furnace temperature is high, the fireworks are large, the temperature measurement environment is harsh, the operator is seriously disturbed, and the observation is random;

[0007] 3. The arrangement of the furnace tubes is irregular, the tubes are sometimes sparse and sometimes dense, and the furnace tubes shake slightly during the production process, making it difficult to locate the furnace tubes;

[0008] 4. The frequency and accuracy of temperature measurement are low, which is of little help to prolong the operation period of the furnace tube and control the coking of the furnace tube

However, the data collected by the automatic temperature measuring device includes not only the temperature of the outer wall of the furnace tube, but also the temperature of the inner wall of the furnace, and since the two temperatures are relatively close, especially when the inner wall of the furnace tube is severely coked, the difference between the two temperatures is very small. very difficult

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