Method for inhibiting hydrocarbons steam cracking furnace from coking and carburizing

Abstract

The invention relates to a method for suppressing coking and carburizing of hydrocarbon steam cracking furnaces, which comprises the following steps: arranging at least one segment of heat transfer enhancement furnace pipe in the furnace pipe of radiation section of the cracking furnace, and preprocessing the hydrocarbon steam cracking furnace by using a sol composition during heat reserve periodof the cracking furnace, wherein the sol composition contains at least one selected from Si sol, Al sol and Zr sol, and the mass concentration of pure oxide in the sol composition is 0.1 to 10% the weight of the sol composition. The method provided by the invention has the advantages of low cost, simple operation, environment friendliness, and no influence on downstream system, and can significantly prolong the service life and the operation cycle of the cracking furnace on the basis of effectively suppressing coking and carburizing of the cracking furnace pipe, thus improving output of ethylene products, etc. and improving the economic benefit of an ethylene plant.

Description

technical field [0001] The invention relates to a method for suppressing coking and carburization of hydrocarbon steam cracking furnaces in the field of petrochemical industry. Background technique [0002] In the pyrolysis ethylene production plant, the cracking furnace is the most critical core equipment, and about 60% of the energy consumption of ethylene production is consumed in the cracking furnace. The cracking furnace tube is the component with the highest operating temperature in the ethylene production device. The cracking reaction of hydrocarbons is carried out in the furnace tube. Due to the secondary reactions such as polymerization and condensation, it is inevitable to generate coke on the inner wall of the cracking furnace tube and the inner wall of the quenching boiler tube. dirt. Coking increases the thermal resistance of the tube wall, reduces the heat transfer coefficient, increases the wall temperature and causes local overheating; coking increases the e...

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Problems solved by technology

[0006] Disclosed in CN1236827A is a method for suppressing and slowing down the coke formation and deposition in the pyrolysis of hydrocarbons, using one or more mixtures of hydrogen sulfide, organosulfur compounds, organophosphorus compounds and organosulfur phosphorus compounds to carry out thermal cracking equipment Pretreatment, but the effect of inhibiting coking is not very ideal

Carburizing causes the furnace tube to creep and rupture, which greatly shortens the service life of the furnace tube

[0009] The existing coking suppression methods in the prior art have the following disadvantages: 1) It affects the downstream system, making the operation of the latter system difficult; 2) The additive is toxic and pollutes the environment; 3) The inhibitor is injected before the cracking furnace is put into oil. If the time is too long, the ethylene output will be reduced; 4) processing and maintenance are difficult and the cost is high; 5) the carburization of the cracking furnace tube cannot be effectively improved; 6) the effect of inhibiting coking and carburization is not ideal, etc.

[0011] However, only setting enhanced heat transfer furnace tubes such as twisted sheet tubes in the radiant section of the ethylene cracking furnace has limitations. The operating cycle of the furnace, but there is still coking between the enhanced heat transfer components such as twisted sheets and the inner wall of the furnace tube. After a period of operation, the cracking furnace will have to be shut down due to severe coking

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