Method for improving coking on inner wall of furnace in acetylene carbon black cracking production

Abstract

The invention belongs to the technical field of conductive carbon black materials and relates to a method for improving coking on the inner wall of an acetylene carbon black cracking furnace. The furnace body of the acetylene carbon black cracking furnace is divided into a reaction area and a cooling area from top to bottom; acetylene is subjected to a thermal cracking reaction in the reaction zone. According to the method of the invention, the discharging port of the cracking furnace is communicated with a gas reflux system, so that the gas reflux system refluxes hydrogen generated by cracking into the reaction zone, so that a gas curtain can be formed at a position close to the inner wall of the furnace, and therefore, the acetylene and cracking intermediate products can be prevented from coking on the inner wall of the reaction zone. According to the gas reflux system, the hydrogen generated by the cracking reaction of the acetylene can be utilized and re-sprayed to the inner wall surface of the reaction zone of the cracking furnace; and a protective gas isolation layer is formed between the furnace inner wall of the reaction zone of the cracking furnace and the acetylene atmosphere, so that the acetylene and the cracking intermediate products are prevented from contacting with the inner wall of the furnace body with relatively low temperature to form coking.

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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