Reduction method for processing waste plastic and system thereof

Abstract

A reduction method for processing waste plastics comprises: (1) pre-treating the waste plastics; (2) heating and cracking waste plastics in a cracking kettle, wherein heat is provided by IGBT super audio frequency heater set at lower part of the cracking kettle; (3) catalytically cracking the oil gas generated in thermal cracking in a catalytic cracking device filled with Y-type molecular sieve; (4) cooling the oil gas generated in catalytic cracking; (5) recovering the fuel oil, combustible gas and the solid. A reduction system for processing waste plastics comprises: thermal cracking part (1) for heating and cracking the waste plastics, catalytic cracking part (2) for further catalytically cracking the oil gas generated in the thermal cracking process and cooling recovering part (3) for recovering fuel oil and fuel gas. The thermal cracking part (1), the catalytic cracking part (2), and the cooling recovering part (3) are connected in series. IGBT super audio frequency heater can save >= 40% energy, compared with the current radio tube high frequency device and the controlled silicon induction heating device. Compared with the method of waste plastics direct catalytic cracking with the zeolite catalyst, the reduction method for processing waste plastics is that oil gas obtained from cracking the waste plastics is cracked by the Y-type molecular sieve, therefore the cracking effect is more evident; the quality of the produced liquid fuel gasoline and diesel fuel is better; the produced fuel gasoline and diesel fuel reach or surpass the 70# gasoline SHO 42-92, 0# diesel national standard GB252-94. Such gasoline can be modulated to be 90-93# white gasoline.

Description

technical field [0001] The invention relates to a reduction method and system for treating waste plastics. Background technique [0002] With the development of society, plastics and their products occupy an extremely important position in the national economy. Whether it is in the defense industry, transportation, machinery manufacturing, agricultural medicine and health, or in people's daily life, it has a wide range of uses. It is estimated that plastic products based on petroleum, coal and natural gas will account for 70% of the world's petrochemical products in this century. With the development of these industries and the huge increase in output, the pollution of their wastes to the environment has gradually become a major public hazard to the human living environment. At present, the pollution caused by plastic waste in major and medium cities in the world is very serious. Due to the use of ground film in farmland, it also causes pollution to farmland. Governments...

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Problems solved by technology

However, the purity of the product obtained by treating waste plastics in this way needs to be improved; the heating device used in the system is an induction variable frequency heater, that is, a thyristor is used to generate intermediate frequency for heating, so this system is in use. There are problems of high energy consumption and high noise during its operation

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