Method of on-line pretreatment inhibiting coking by hydrocarbon pyrolysis apparatus

A cracking device and pretreatment technology, applied in cracking, non-catalytic thermal cracking, petroleum industry and other directions, can solve the problems of carburizing the inner wall of the furnace tube, carburizing the furnace tube, uneconomical, etc. Erosion resistance and improved service life
CN1928020AInactive Publication Date: 2007-03-14EAST CHINA UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
EAST CHINA UNIV OF SCI & TECH
Publication Date
2007-03-14
Estimated Expiration
Not applicable · inactive patent

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Abstract

The present invention relates to method of online inhibiting coking in hydrocarbon cracking apparatus. The method is that after the coke is burnt out, the hydrocarbon cracking apparatus is pre-treated with chemical(s) containing S, Si and Mg and inert gas at 400-1000 deg.c for 1-8 hr. The technological process first poisons the catalyst n the furnace tube surface and then deposit one layer of compact ceramic coating combined tightly to the furnace tube, and can reduce coking greatly and increase the production period. The method is simple and may be completed repeatedly.
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Description

technical field

[0001] The invention relates to a method for on-line pretreatment of a hydrocarbon cracking device to suppress coking, in particular to a method for online coating an inorganic or ceramic coating on the inner surface of a furnace tube to reduce coking and carburization of the furnace tube. Background technique

[0002] In the hydrocarbon cracking production unit, the hydrocarbon material is mixed with steam and then enters the cracking unit, so that the material is cracked at a high temperature of 700°C to 900°C to produce olefin products such as ethylene, propylene, butadiene and aromatics. Hydrocarbon materials generally include alkanes, naphtha, diesel or residual oil, etc. Due to the extremely complicated cracking process, hundreds of compounds are produced, and the cracked products contain a variety of alkenes, dienes, alkynes, organic colloids, metal oxides, mercaptans, heterocyclic sulfides and thioethers, aldehydes, and ketones Such compounds are all...

Claims

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