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Anaerobic pyrolysis - the ultimate treatment of waste tires

Label: www.zzhrgroup.com Time: 2019/7/19 15:36:42

 Waste tires are called black pollution, and their recycling and treatment technologies have always been a worldwide problem and a problem in environmental protection. According to statistics, there are currently 150 million tires scrapped every year in the world, including about 400 million in North America, 200 million in Western Europe, and 100 million in Japan. In the 1990s, the most common practice in the world was to bury or stack used tires. However, as land prices rise, it is increasingly difficult to requisition land for burial/stacking of tires. On the other hand, the accumulation of used tires is extremely prone to fires, causing a second public hazard. With the rapid development of China's automobile industry, the environmental pressure brought by used tires is also growing.

  Waste tires are called black pollution, and their recycling and treatment technologies have always been a worldwide problem and a problem in environmental protection. According to statistics, there are currently 150 million tires scrapped every year in the world, including about 400 million in North America, 200 million in Western Europe, and 100 million in Japan. In the 1990s, the most common practice in the world was to bury or stack used tires. However, as land prices rise, it is increasingly difficult to requisition land for burial/stacking of tires. On the other hand, the accumulation of used tires is extremely prone to fires, causing a second public hazard. With the rapid development of China's automobile industry, the environmental pressure brought by used tires is also growing.


 

  There are two main ways to deal with and utilize waste tires. One is the renovation of used tires; the other is the comprehensive utilization of waste tires.

  Renovation is the main and best way to use used tires. It is to cut off the outer layer of worn and worn tires, paste the rubber, and then vulcanize and reuse. At present, refurbishment is the main way for developed countries to deal with used tires. At present, the annual production of retreaded tires (overturned tires) is about 80 million, which is 7% of new tire production. However, China's tire retreading industry has a large gap with these advanced countries, and less than 10% of the used tires have been refurbished.

  Pyrolysis refers to an irreversible thermochemical reaction in which the organic matter in the used tire is cracked by high temperature under anaerobic or anoxic conditions to escape volatile products and form solid coke. The whole process of pyrolysis is carried out under the condition of no oxygen, the safety performance can be guaranteed, the working pressure of thermal pyrolysis and catalytic pyrolysis is normal pressure (for vertical tank, it can be micro-negative pressure - 0.02MPa and 280--380 °C) ), the material changes in the state of the tire at ≯400 °C, firstly from solid → gaseous → liquid, the vapor phase material produced by pyrolysis can produce flammable gas, gasoline and diesel mixture according to different carbon molecular chains and different components. The fuel that has passed through the condenser into a liquid state.

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