Sealing method of petrifaction ethylene pyrolysis furnace tube and furnace roof liner portion

Abstract

The invention belongs to a method for sealing linings of a furnace tube and a furnace roof of an ethylene cracking furnace in the petrochemical industry. The method comprises the steps as follows: an anchor nail is welded and fixed at the inner wall of the lining part of the furnace roof of the furnace; the corresponding furnace tube running through a perforation at the furnace roof is wrapped by combustible material, or the furnace tube at the position is sheathed and fixed by a sleeve made from the combustible material, or the furnace tube at the position is sheathed and fixed by a detachable sleeve, wherein, the thickness of the combustible material or the sleeve is the permissible length between the outer wall of the furnace tube and an insulation layer of the inner wall of the perforation of the furnace roof; an insulation layer with zirconium fiber is sprayed on the inner wall of the lining of the furnace roof of the furnace, a steel wire mesh is fixed between the insulation layer with the zirconium fiber and the anchor nail, and another insulation layer with the zirconium fiber is sprayed on the steel wire mesh, the steps are carried out repeatedly in sequence until the insulation layer with the zirconium fiber covers the anchor nail and meets the required thickness. The method can effectively solve the sealing problem of the linings of the furnace tube and the furnace roof, and has the advantages of simple and easy operation, rapid operation speed and greatly improving the service life of the furnace.

Description

technical field [0001] The invention belongs to a method for sealing the furnace pipe and furnace top lining of a petrochemical ethylene cracking furnace. Background technique [0002] Ethylene cracking furnace is an important equipment for processing and separating petrochemical products in the field of petrochemical industry. The furnace body of this equipment is usually made of steel. In the hearth of the ethylene cracking furnace, the furnace tubes distributed in a U-shaped wave shape repeatedly penetrate into the furnace body from the box lining part on the top of the furnace, and are suspended in the furnace body, while the furnace tubes located outside the furnace roof are made of insulating materials and The liner box is wrapped and connected to lead out the furnace body. Burners are distributed on the bottom and side walls of the furnace. In order to prevent the furnace body from being burned by high temperature, an insulation layer with a thickness of about 200-40...

AI Technical Summary

Problems solved by technology

However, when the ethylene cracking furnace is burning, the furnace tube in the furnace will swing, and the unfixed refractory fiber will fall off quickly or the expansion and swing gap of the furnace tube cannot be guaranteed, which often causes the high-temperature combustion flame in the furnace to escape from the furnace. If the hole strings out, the support plate of the furnace body and the shunt pipe suspended at the upper end of the furnace tube will be burnt out, causing an accident and making the production unable to proceed normally.

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