Process for thermal cracking of waste tires

Abstract

The invention discloses a process for thermal cracking of waste tires. The process comprises the following steps: preheating a whole waste tire with a catalyst in a preheating bin by using flowing nitrogen of which the temperature is 300-450 DEG C; then putting the waste tire into a cracking bin, and performing cracking in a flowing nitrogen atmosphere of which the temperature is 600-1000 DEG C; and finally separating steel wires and carbon black after cracking, separating a cracking gas from hot nitrogen, and introducing the cracking gas into a condenser for condensation. In the whole cracking process, oxidation is isolated by the nitrogen, a high-value oil product is obtained, and meanwhile, the recovery rate of pyrolysis oil is improved. The nitrogen used in the process disclosed by the invention is a byproduct from a steel plant, and the heat of the nitrogen is reused in the whole process. The thermal cracking cost of the waste tires is reduced by adopting the waste nitrogen of the steel plant, the cracking quality is improved, and meanwhile, the recovery utilization of the cracking gas ensures that self-sufficiency of energy is realized by the process disclosed by the invention. By adopting the process, the reutilization of industrial waste gases and waste tires is realized, and the aims of resource recovery and energy efficiency are achieved.

Description

technical field [0001] The invention relates to a process for recycling waste tires, in particular to a thermal cracking process for waste tires. Background technique [0002] With the development of the automobile industry, the demand for rubber products such as tires is increasing day by day. At the same time, the amount of waste tires has also increased sharply, which has brought environmental problems. At present, there are mainly the following methods for the treatment of waste tires: landfill method, incineration method, recycling and cracking method, etc. Among them, the pyrolysis of waste tires is the high polymer in waste tires under the condition of anoxic or inert gas. It is an incomplete pyrolysis process of pyrolysis gas, pyrolysis oil, and pyrolysis carbon as the main storage energy and raw materials at an appropriate temperature. The inert gas pyrolysis technology refers to that inert gas is passed into the reactor to purge the reactants during the tire p...

AI Technical Summary

Problems solved by technology

The cracking method of waste tires disclosed in the prior art has the following defects: the annular steel wire in the tire is pulled out before the cracking, and then the tire is cut into pieces, which increases the production process and processing cost; It is a power supply, with high energy consumption and poor efficiency; the nitrogen used is produced by a nitrogen generator, which requires a lot of equipment investment, long production process, and high cost

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