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What factors affect the mass decline rate of waste plastic pyrolysis?

2024-10-29

 Pyrolysis of waste plastics is an energy recovery method that has been studied at home and abroad in recent years. It is considered to be the most effective and scientific way to recycle plastics. Factors affecting the quality reduction rate of waste plastics include the type and properties of waste plastics, pyrolysis conditions, additives and impurities, reactor type and operation mode, etc., which will be introduced in detail below.

 1. Types and properties of waste plastics 

Different types of waste plastics have different chemical structures, which directly affect the difficulty of pyrolysis and the quality reduction rate.

Waste plastics with higher molecular weight are usually more difficult to pyrolyze and have a relatively low quality reduction rate. Waste plastics with high crystallinity have densely arranged molecules and good thermal stability. The pyrolysis reaction is relatively difficult to carry out and the quality reduction rate is low. Non-crystalline waste plastics are relatively easy to pyrolyze, and the quality reduction rate may be higher.

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2. Pyrolysis conditions

Pyrolysis conditions include temperature, heating rate and residence time. Pyrolysis temperature is one of the key factors affecting the quality reduction rate. Generally speaking, as the pyrolysis temperature increases, the pyrolysis reaction rate of waste plastics accelerates and the quality reduction rate also increases. The heating rate also has a certain effect on the quality reduction rate. Properly extending the residence time can make the pyrolysis reaction more complete, and the quality reduction rate may increase.

3. Additives and impurities

Waste plastics may contain various additives, such as flame retardants, antioxidants, plasticizers, etc. These additives may react differently during the pyrolysis process, affecting the quality reduction rate of pyrolysis.

4. Reactor type

Different types of pyrolysis reactors, such as fixed bed reactors, fluidized bed reactors, rotary kiln reactors, etc., have different effects on the quality reduction rate of waste plastic pyrolysis. Continuous operation and intermittent operation will also have an impact on the quality reduction rate.

The quality reduction rate of waste plastic pyrolysis is affected by a variety of factors such as the type and properties of waste plastics, pyrolysis conditions, additives and impurities, and reactor type and operation mode. In practical applications, it is necessary to optimize the pyrolysis process parameters according to the specific situation to improve the pyrolysis efficiency and quality reduction rate, while ensuring the quality of the pyrolysis products.

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