A method for improving the coking of the inner wall of the furnace in the cracking production of acetylene carbon black

Abstract

The invention belongs to the technical field of conductive carbon black materials, and in particular relates to a method for improving the coking of the inner wall of an acetylene carbon black cracking furnace, wherein the furnace body of the acetylene carbon black cracking furnace is divided into a reaction zone and a cooling zone from top to bottom, and acetylene in the cracking furnace The thermal cracking reaction occurs in the above reaction zone. In the present invention, a gas reflux system is connected to the discharge port of the cracking furnace, so that the gas reflux system can return the hydrogen generated by cracking to the inside of the reaction zone and form gas near the inner wall of the furnace. curtain to block the coking of acetylene and cracking intermediates on the inner walls of the reaction zone. The gas reflux system provided by the present invention can utilize the hydrogen produced by the cracking reaction of acetylene, and spray it to the inner wall surface of the cracking furnace reaction zone, and form a protective gas insulation layer between the furnace inner wall of the cracking furnace reaction zone and the acetylene atmosphere, so as to This blocks acetylene and cracked intermediates from contacting the cooler inner walls of the furnace to form coke.

Description

technical field [0001] The invention belongs to the technical field of conductive carbon black materials, and more specifically relates to a method for improving the coking of the inner wall of a furnace in the cracking production of acetylene carbon black. Background technique [0002] Acetylene carbon black is produced by thermal cracking of acetylene gas under the condition of isolation from air, which belongs to thermal cracking carbon black. A method of generating carbon black by performing intermittent (that is, two stages of combustion heat storage and thermal cracking) or continuous (single thermal cracking) thermal cracking under certain conditions. The carbon black produced by cracking natural gas as a raw material under the condition of isolation of air (that is, two stages of combustion heat storage and thermal cracking) is called pyrolytic carbon black. Acetylene gas is used as raw material to conduct continuous (single thermal cracking) thermal cracking under ...

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Problems solved by technology

Since the occurrence of coking reaction is mainly due to the lower temperature of the furnace wall, the use of light and high-quality cracking raw materials or the addition of coking inhibitors can only slow down the formation of coking to a certain extent, and the effect is not obvious, and the operation period is prolonged. Increased production costs; mechanical decoking on the surface of the furnace wall requires regular shutdown of the furnace for cleaning, hindering the continuous preparation of acetylene carbon black

[0006] CN 210193733U discloses a sealing connector, a scraper device and a cracking furnace system, through which the scraper mechanism controls the scraper to move up and down to scrape and clean the material attached to the inner wall of the cracking furnace, but this method adopts the principle of physical contact and cannot Scraping off all the slag can not guarantee the purity of the carbon black product; in addition, the high temperature released during the reaction can easily burn through the scraper protection system and force the cracking furnace to stop production for maintenance, which affects the production efficiency of acetylene carbon black

[0007] CN 1253417C discloses a method of reducing coking by introducing argon into the cracking furnace, that is, spraying external argon into the middle of the cracking furnace wall and the acetylene atmosphere to form a protective gas layer, and blocking the formation of acetylene attached to the inner wall of the furnace with a lower temperature. Coking, but this method needs to introduce new gas from the outside, which increases the production cost of acetylene cracking, and does not meet the actual needs of energy saving and consumption reduction

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