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Method for improving thermophysical property of coking inhibition silicon/sulfur composite coating of ethene cracking apparatus

A thermophysical property, ethylene cracking technology, applied in coating, metal material coating process, cracking and other directions, can solve the problems of thermal stress concentration, large difference, low bonding strength between coating and substrate, etc., to achieve easy operation, The effect of prolonging the service life and improving the thermophysical properties

Inactive Publication Date: 2011-10-26
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

Ceramic materials have an inherent weakness of brittleness, and the thermal physical properties (such as expansion coefficient, thermal conductivity, etc.) of metal materials are quite different, which is easy to cause thermal stress concentration. The combination of ceramic coating and base material is mainly mechanical fitting. Prone to micro-cracks, resulting in low bonding strength between the coating and the substrate

Method used

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  • Method for improving thermophysical property of coking inhibition silicon/sulfur composite coating of ethene cracking apparatus
  • Method for improving thermophysical property of coking inhibition silicon/sulfur composite coating of ethene cracking apparatus
  • Method for improving thermophysical property of coking inhibition silicon/sulfur composite coating of ethene cracking apparatus

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Effect test

example 1

[0019] The coating of the coke-suppressing silicon / sulfur composite coating is carried out in the pilot plant for evaluation of coking by high-temperature pyrolysis of hydrocarbons described in the patent CN101113366A. The pilot plant has a good effect on the evaluation of high-temperature pyrolysis coking of hydrocarbons, and can effectively solve the problem of difficulty in scaling up the laboratory results of surface coating coking suppression technology, and provides a reliable basis for the industrial implementation of surface coating coking suppression technology in ethylene cracking furnace Equipment Warranty.

[0020] After the cracking process is over, the pilot cracking furnace tube is decoked. The coke cleaning atmosphere is a mixture of air and water vapor. At the same time, the infrared gas analyzer was used to monitor the CO at the outlet of the cracking furnace tube 2 Volume fraction. When the furnace tube exits CO 2 When the volume fraction is less than 0....

example 2

[0029] A small industrial furnace was selected for the coating test of the coke-suppressing silicon / sulfur composite coating. When the outlet temperature was 830°C, the average ethane feed was 5 tons / hour, and the operation period was 40 days. The radiant section coil is made of HK40 alloy and is divided into two processes.

[0030] After the cracking process is over, the cracking furnace tube is decoked. The coke cleaning atmosphere is a mixture of air and water vapor. At the same time, the infrared gas analyzer was used to monitor the CO at the outlet of the cracking furnace tube 2 Volume fraction. When the furnace tube exits CO 2 When the volume fraction is less than 0.2%, scorching ends.

[0031] Use water vapor to carry out pre-oxidation treatment on the metal sample, the temperature is 800°C, and the pre-oxidation time is 2-6 hours.

[0032] Coke-cleaned ethylene cracking furnace tubes are coated with a silicon / sulfur composite coating. The specific method and proce...

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Abstract

The invention provides a method for improving thermophysical property of a coking inhibition silicon / sulfur composite coating of an ethene cracking apparatus. The method is characterized by: carrying out a coke cleaning for a furnace tube prior to coating the coking inhibition coating, then carrying out an oxidation pretreatment for metal base on inner surface of the furnace tube. With the method, the silicon / sulfur composite coating provides improved wetting for the metal base through the formed oxide layer on the surface of the metal base, and a chemical combination between the coating and the base metal is improved. According to the present invention, a combination intensity of the coking inhibition silicon / sulfur composite coating and the metal base, thermal shock resistance of the coating and micro-penetration hardness of the coating are effectively raised, and service life of the coating is prolonged.

Description

technical field [0001] The invention relates to a method for improving the thermophysical properties of a coking-inhibiting silicon / sulfur composite coating, in particular to a method for greatly improving the silicon / sulfur composite coating by oxidizing the inner surface of the ethylene cracking furnace tube before the coating is coated. Thermophysical Properties of Composite Coatings, a Method to Extend the Service Life of Coke Suppression Coatings. technical background [0002] The current method of producing short-chain olefins is mainly realized by high-temperature thermal cracking of hydrocarbons. The high-temperature thermal cracking process of hydrocarbons has complicated reactions. During the decomposition process of cracking raw materials, intermediate free radicals will undergo polycondensation reaction and dehydrogenation reaction, which will make the cracked products move to the direction of coke formation. That is the so-called secondary reaction, so it is in...

Claims

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Application Information

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IPC IPC(8): C23C8/10C10G9/16
Inventor 徐宏王志远张莉栾小建周建新刘京雷
Owner EAST CHINA UNIV OF SCI & TECH
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