Method for reducing coking of cracking device

Abstract

The invention relates to the field of furnace tube coking, in particular to a method for reducing coking of a cracking device. The method comprises the following step: during a hot standby period, treatment gas containing a silicon-containing organic compound, a polysulfide organic compound and carrier gas is introduced into a cracking device for heat treatment under a heat treatment condition. The general formula of the polysulfide organic compound is R1-Sn-R2, wherein n is an integer from 3 to 5, R1 and R2 are independently selected from hydrogen or alkyl with the carbon atom number being 1to 24, and R1 and R2 are not hydrogen at the same time. The raw materials used in the method are small in smell and convenient to operate in use, the coking phenomenon on the surface of the cracking device can be effectively inhibited, and the operation period of the cracking device is prolonged.

Description

technical field

[0001] The invention relates to the field of coking of furnace tubes, in particular to a method for reducing coking of cracking devices. Background technique

[0002] A prominent problem in the process of hydrocarbon cracking to produce ethylene is coking on the inner wall of the cracking furnace tube and carburization of the metal matrix. Coking will increase the thermal resistance of the furnace tube wall of the cracking furnace, reduce the heat transfer coefficient, cause the wall temperature to rise, and cause local overheating, shortening the life of the furnace tube. When the coke layer reaches a certain thickness, regular decoking is required. Frequent decoking not only reduces the output, but also affects the life of the furnace tube. In addition, the carbon deposited on the surface of the furnace tube will diffuse into the metal matrix to form carbides, which will increase the brittleness of the material and cause metal powdering. These carburizing...

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