Continuous thermal-cracking method and apparatus for waste and old tires

Abstract

The invention provides a continuous thermal-cracking method and an apparatus for waste and old tires. The method comprises the following steps: (1) preheating waste and old tire at 230-250 DEG C for 15-25 min, and under a vacuum condition, extracting and removing a gas generated in the preheating process; (2) heating the material obtained in the step (1) to 340-360 DEG C, and performing cracking at 340-360 DEG C for 8-12 min to enable natural rubber to be cracked, and under a vacuum condition, extracting and removing a gas generated in the cracking process; (3) heating the material obtained in the step (2) to 440-460 DEG C, and performing cracking at 440-460 DEG C for 8-12 min to enable cis-1,4-polybutadiene rubber and styrene-butadiene rubber to be cracked, and under a vacuum condition, extracting and removing a gas generated in the cracking process; and (4) heating the material obtained in the step (3) to 540-560 DEG C, and performing cracking at 540-560 DEG C for 8-12 min to enable carbonaceous sediment on the surface of carbon black to be cracked, and under a vacuum condition, extracting and removing a gas generated in the cracking process. The method and the apparatus are capable of effectively removing sediment on the surface of carbon black, improving the activity and the quality of carbon black, and realizing cracking continuous production of waste and old tires in a low energy consumption way.

Description

technical field [0001] The invention relates to a method and device for comprehensive utilization of waste tires, in particular to a method and device for continuous thermal cracking of waste tires. Background technique [0002] The thermal cracking of waste tires is the last key step in the comprehensive utilization of waste tires and turning waste into treasure. For a long time, it has received great attention from all walks of life, and many researchers have done a lot of research and experimental work for it. However, due to various reasons, an ideal large-scale, industrialized, continuous production line that meets environmental protection requirements and is economically feasible has not yet been formed. So far, the existing pyrolysis furnaces capable of continuous production focus on the separation of oil for the cracking of waste tires, and the quality of the finally obtained carbon black is not ideal, while the intermittent production pyrolysis furnaces can make th...

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Problems solved by technology

So far, the existing pyrolysis furnaces capable of continuous production focus on the separation of oil for the cracking of waste tires, and the quality of the finally obtained carbon black is not ideal. The comprehensive performance of black is close to the performance of N660, but because of the inability to carry out continuous production, there are still problems such as energy waste, environmental pollution and high cost

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