Process for thermal cracking of waste tires

A technology for pyrolysis of waste tires, which is applied in the field of pyrolysis process of waste tires, can solve the problems of increased production process and processing cost, large investment in equipment, long production process, etc., so as to save the shredding process, improve product quality, low cost effect

Inactive Publication Date: 2015-04-22
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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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 proces

Method used

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  • Process for thermal cracking of waste tires

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Embodiment

[0021] (1) Clean and remove waste tires with a weight of 100Kg; send the whole tire into the feeding bin for preheating, and the waste nitrogen from the steelmaking plant, which is preheated to 350°C by a low-temperature hot blast stove, continues at a certain flow rate The purpose of preheating the tires is achieved through the feeding bin, and the tires are preheated to 200°C after 15 minutes;

[0022] (2) Send the tires treated in the previous step into the cracking bin, add 1.5Kg of kaolin catalyst and 1.5Kg of activated clay catalyst at the same time, and pass high-temperature nitrogen preheated to 850°C through a high-temperature hot-air stove into the cracking bin. It is not only used as a heating source but also as an inert gas for protection. At the same time, it can also be used as a purge gas to take the cracked gas out of the cracking chamber in time to avoid secondary cracking, so that the high-temperature nitrogen flow can be stabilized to keep the temperature of ...

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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...

Claims

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Application Information

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IPC IPC(8): C10G1/10B01J19/14C09C1/48
CPCY02P20/10
Inventor 代永娟张驰张国豪张贯旭张仕飚
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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