Device and method for producing low-ash low-sulfur carbon black through pyrolysis of waste and old tires

Abstract

The invention discloses a device and method for producing low-ash low-sulfur carbon black through pyrolysis of waste and old tires and belongs to the technical field of waste and old tire pyrolysis treatment. The device comprises a cracking chamber and an outer heating chamber. The cracking chamber comprises an initial cracking zone, a middle cracking zone and a rear cracking zone. The upper part of the initial cracking zone is provided with a raw material inlet. The tail end of the rear cracking zone is provided with a cracked carbon black outlet. The initial cracking zone, the middle cracking zone and the rear cracking zone are respectively provided with pyrolysis gas outlets. The method comprises natural rubber cracking in the initial cracking zone, synthetic rubber cracking in the middle cracking zone and pyrolysis of carbon black in the rear cracking zone. The device and method are suitable for production of low-ash low-sulfur carbon black through pyrolysis of waste and old tires.

Description

technical field [0001] The invention relates to a device and method for producing low-ash and low-sulfur carbon black by pyrolysis of waste tires, belonging to the technical field of pyrolysis treatment of waste tires. Background technique [0002] The cracking of waste rubber is to send the rubber particles of waste tires or rubber products into the cracking furnace after crushing and magnetic separation to separate the steel wire, and carry out thermal decomposition reaction in an oxygen-free environment to recover cracked gas, cracked oil and carbon black and other renewable resources. . The pyrolysis gas in the pyrolysis product can be used as liquefied gas after treatment. After the pyrolysis oil is distilled and fractionated, different types of fuel oil can be obtained according to different freezing points. Carbon black can be used as a filler for tires or rubber products, and steel wire can be re-melted. steel. [0003] Although the existing continuous cracking dev...

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Problems solved by technology

[0004] 1. Tire pyrolysis usually includes two stages, the thermal decomposition of natural rubber in the tire and the thermal decomposition of synthetic rubber, but the existing cracking technology and equipment, the two cracking processes are carried out in the same reaction chamber and under the same cracking conditions, but the above-mentioned The pyrolysis temperature and time required by the two processes are quite different, and it is difficult to achieve precise control;

[0005] 2. Rubber is a material with excellent thermal insulation performance. During the cracking process, the rubber particles close to the heating surface are heated first, and the heat must be transferred to the rubber powder farther away from the heating surface by the rubber particles heated first. The form of heat transfer and heating, heat transfer is extremely difficult

[0006] 3. The rubber powder in the cracking device is softened and melted by heat, forming a viscous flow state, which makes it difficult for the cracked oil and gas to pass through, and the cracked gas outlet of the cracking device is mostly set at the outlet of the solid carbon black product, and the cracked gas stays in the high temperature area A long time will make the oil and gas cracked into non-condensable combustible gas below C5, which will reduce the oil yield of fuel oil with higher added value.

[0007] 4. The pyrolysis product carbon black is a porous substance, which will absorb a certain amount of fuel oil before it is discharged from the cracking device. subsequent use

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