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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

Inactive Publication Date: 2007-03-14
EAST CHINA UNIV OF SCI & TECH
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Problems solved by technology

[0008] (3) Coking at high temperature is easy to carburize the inner wall of the furnace tube, resulting in deterioration of the inner wall of the furnace tube;
[0009] (4) The uneven combustion of coke during the coke cleaning process leads to local overheating of the furnace tube, and during the coke cleaning cycle, the carburization of the furnace tube is more serious, which shortens the life of the furnace tube
Uneconomical for more than 8 hours

Method used

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

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Embodiment Construction

[0033] Further illustrate content of the present invention below in conjunction with example, but this example does not limit protection scope of the present invention.

[0034] The examples show a comparison of coated samples and uncoated tests in a home-made laboratory setup. The schematic diagram of the cracking test device is shown in Figure 1.

[0035] The heating furnace is a two-stage temperature-controlled tubular heating furnace with a heating length of 1000mm; the cracking tube is an HK40 tube with an outer diameter of 25mm and a length of 200mm, and the length of the preheating part of the front section is 1m. When pretreating the cracking tube, sulfur and silicon-containing compounds enter the cracking furnace tube along with water vapor to deposit sulfur and silicon dioxide composite coating, using carbon disulfide and tetramethoxysilane. Among them, the ratio of sulfur to silicon atoms is 2:1, the ratio of silicon compound to water vapor is 2.4g / h, and the flow ...

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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.

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...

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Application Information

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IPC IPC(8): C10G9/16
Inventor 徐宏周建新刘京雷戚学贵张莉侯峰姜志明
Owner EAST CHINA UNIV OF SCI & TECH
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