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Pyrolysis and catalytic pyrolysis method for infrared rapid heating of waste plastics

A technology for waste plastics and catalytic pyrolysis, which is used in the heating of coke ovens, special forms of dry distillation, coke ovens, etc. The effect of improving quality and improving catalytic efficiency

Pending Publication Date: 2021-08-31
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It not only solves the problems of slow heating rate, uneven heating of raw materials and high content of macromolecular substances in pyrolysis products in the existing pyrolysis method, but also improves the quality of pyrolysis products and realizes high-value utilization of waste plastics

Method used

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  • Pyrolysis and catalytic pyrolysis method for infrared rapid heating of waste plastics

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Such as figure 1 As shown, the infrared heating waste plastics pyrolysis and catalytic pyrolysis method of the present invention is the process equipment for separate pyrolysis of waste plastics. The components include a gas distribution system 1 , a pyrolysis reactor 2 and a product recovery system 4 . The specific structure and connection relationship of the components are:

[0036] The gas distribution system 1 includes a high-pressure steel cylinder 1-1, a gas pressure reducing valve 1-2 and a high-pressure steel cylinder 1-3, which are connected by stainless steel pipes or copper pipes with an inner diameter of 3mm, and the high-pressure steel cylinder 1-1 is first connected to the gas Pressure reducing valve 1-2, gas pressure reducing valve 1-2 is connected with high-pressure steel cylinder 1-3 again, and high-pressure steel cylinder 1-3 is connected with pyrolysis reactor 2;

[0037] The product recovery system 4 includes a refrigerator 4-1, a liquid collection ...

Embodiment 2

[0039] Such as figure 2 As shown, the infrared heating waste plastics pyrolysis and catalytic pyrolysis method of the present invention is the process equipment for catalytic pyrolysis of waste plastics. The components include a gas distribution system 1, a pyrolysis reactor 2, and a catalytic pyrolysis reactor 3. As well as the product recovery system 4, the specific structure and connection relationship of the components are:

[0040] The gas distribution system 1, the product recovery system 4 components and the connection relationship are the same as those described in embodiment 1, the difference is that the gas distribution system 1 is first connected to the pyrolysis reactor 2, and the pyrolysis reactor 2 is then connected to the catalytic pyrolysis reaction Device 3, catalytic pyrolysis reactor 3 is connected with product recovery system 4 again.

Embodiment 3

[0042]A pyrolysis and catalytic pyrolysis method for rapid infrared heating of waste plastics. When waste plastics are individually pyrolyzed, the pyrolysis device is connected according to the connection method described in Example 1, and the plastic (polyethylene) with a particle size of 10mm is Take by weighing 3g and pack in the pyrolysis reactor 2, connect the pipeline, the gas in the high-pressure steel cylinder 1-1 is preferably nitrogen, adjust the gas flow 100ml / min of the high-pressure steel cylinder 1-3,

[0043] The temperature of pyrolysis reactor 2 is preferably 400 DEG C, and the temperature rise rate is preferably 20 DEG C / s, and the residence time that is set at 400 DEG C is 30min, and the pyrolysis product distribution solid product that this condition obtains accounts for 0.9%, and liquid product ( Waxy) 92.6%, gas products accounted for 6.5%.

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Abstract

The invention discloses a pyrolysis and catalytic pyrolysis method for infrared rapid heating of waste plastics. The method utilizes infrared heating to realize rapid heating, and pyrolyzes the waste plastics into gas, liquid and solid three-phase products at high temperature. When the waste plastics are subjected to catalytic pyrolysis, the waste plastics are firstly decomposed into long-chain hydrocarbon macromolecular compounds in the pyrolysis reactor, then the substances are subjected to fracture, aromatization and other reactions in the catalytic pyrolysis reactor under the action of a catalyst, and high-quality pyrolysis products are selectively prepared. According to the method, independent rapid pyrolysis and catalytic rapid pyrolysis of the waste plastic are achieved, the pyrolysis reaction and the catalytic reaction are separated, the catalytic temperature can be flexibly controlled, and the catalyst is not prone to inactivation due to the fact that the catalyst is separated from the plastic.

Description

technical field [0001] The invention relates to the technical field of energy conversion of plastics, in particular to a pyrolysis and catalytic pyrolysis method for rapid infrared heating of waste plastics. Background technique [0002] With the development of economy and society, plastics have become the main industrial waste and municipal waste. At present, recycling is the most suitable way to dispose of waste plastics, but there are often various additives in different waste plastics, and it is difficult to Separation, which largely limits the recycling of waste plastics. Pyrolysis technology is the process of decomposing thermally decomposable substances into solid, liquid and gas three-phase products under high temperature and anaerobic conditions. Coal pyrolysis to prepare liquid fuel and synthesis gas has achieved industrial operation. [0003] In the traditional pyrolysis technology, there are few researches on the reaction device for the pyrolysis of waste plasti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10B53/00C10B57/02C10B57/00C10B23/00
CPCC10B53/00C10B57/02C10B57/00C10B23/00
Inventor 胡二峰
Owner CHONGQING UNIV
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