Process method for preparing pyrolysis oil and gas from waste tires

Abstract

The invention relates to the technical field of environmental protection, in particular to a process method for preparing pyrolysis oil and gas from waste tires. Its characteristics are: the main purpose of pyrolysis of waste tires is to recover pyrolysis oil and pyrolysis carbon, and further produce fuel oil, carbon black and other products. If pyrolysis gas is used as the main product, it is undoubtedly uneconomical, because the increase in pyrolysis gas The yield needs a higher pyrolysis temperature of 550-600°C to break the pyrolysis oil chain hydrocarbons with larger molecular weight to generate pyrolysis gas mainly composed of methane, ethane, ethylene, propylene and other components with smaller molecular weight. The pyrolysis temperature causes a part of energy to be wasted in vain on destroying molecular chains, and the pyrolysis gas generated by degrading pyrolysis oil is flammable, explosive and difficult to store and transport; in order to reduce the cost of pyrolysis reaction furnace and facilitate mechanical processing, the furnace body material selection For Q345R steel, considering the allowable stress requirements of Q345R steel at high temperature, that is, it can be used at a temperature not exceeding 475°C. Considering the above factors comprehensively, the pyrolysis process temperature of waste tires is designed to be 350-400°C.

Description

technical field [0001] The invention relates to the technical field of environmental protection, in particular to a process method for preparing pyrolysis oil and gas from waste tires. Background technique [0002] Waste tires are common solid waste pollutants, and people use many ways to recycle them to achieve harmless treatment, among which the preparation of fuel oil and carbon black by pyrolysis of waste tires is one of the solutions. Chinese invention patent (patent application number is 02112328.4, patent name is vertical pyrolysis tower for recycling industrial carbon black and fuel oil by pyrolysis of waste tires) discloses a vertical pyrolysis tower for recycling industrial carbon black and fuel oil by pyrolysis of waste tires , which is characterized in that it has a closed vertical tower body, and an upper scraping and stirring device, a tire feed port and a cracking gas outlet are arranged at the upper end of the tower body, and the upper hollow heating disc and...

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Problems solved by technology

[0003] The prior art—the vertical pyrolysis tower used for pyrolysis of waste tires to recover industrial carbon black and fuel oil has proposed a solution for the continuous production of fuel oil and carbon black by pyrolysis of waste tires, but the detailed technical details of recycling pyrolysis oil and gas have not been disclosed; The working principle of existing technology 2 waste tire pyrolysis device is similar to the reaction kettle with external heating jacket and built-in agitator. The piece arm stirs and mixes the rubber blocks of waste tires. In order to increase the heat exchange area, the upper and lower ring discs are designed with flue gas passages to pass through high-temperature flue gas. The disadvantage is that the rubber blocks containing steel wires form viscous during the pyrolysis process. The mixture containing steel wire balls adheres to block all flow channels such as the feeding channel, thereby stopping the pyrolysis process

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