A new anti-coking vdf cracking furnace system and its application method

Abstract

The invention discloses a new anti-coking VDF cracking furnace system, which includes a cracking furnace, a waste heat recovery device and a quencher. The cracking furnace is provided with a spiral furnace tube and a partition heating device from top to bottom; the waste heat recovery device includes a first tube The shell heat exchanger and the first horizontal tank body, the first horizontal tank body is provided with a first jacket, the discharge port of the cracking furnace is connected with the first horizontal tank body, and the discharge of the first horizontal tank body The mouth is connected with the tube-side inlet of the first shell-and-tube heat exchanger, and the shell-side of the first shell-and-tube heat exchanger is fed with cold material, and its shell-side outlet is connected to the inlet of the first jacket. connected, the discharge port of the first jacket is connected with the feed port of the cracking furnace; the waste heat recovery device is connected with the feed port of the quencher, and the discharge port of the quencher is connected with the product collection process. The cracking furnace system can reduce the coking in the cracking furnace tube and the heat exchanger tube, prolong the cleaning cycle of the cracking furnace tube and the heat exchanger, and preheat the cold material through the waste heat recovery device to reduce energy consumption.

Description

technical field [0001] The invention relates to the technical field of cracking furnaces, in particular to a novel anti-coking VDF cracking furnace system and its application method. Background technique [0002] Vinylidene fluoride (CH 2 CF 2 ) or VDF, is one of the important monomers in the fluorine chemical industry, mainly used in the production of polyvinylidene fluoride and fluorine rubber. There are many ways to prepare vinylidene fluoride. At present, 1-chloro-1,1-difluoroethane (HCFC-142b or R142a) is mainly used as raw material to prepare vinylidene fluoride through pyrolysis in industry. The cracking reaction is usually carried out in a cracking furnace. The cracking reaction is sensitive to temperature. When the temperature is too low, the conversion rate is low; when the temperature is too high, coking is easy to occur. At present, in the vinylidene fluoride (VDF) production industry, most of the furnace tubes of the cracking furnace adopt a U-shaped series s...

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