A method and system for dechlorination of waste plastics based on steam flow dispersion blowing

A technology of waste plastic and steam flow, applied in the field of waste plastic dechlorination

Active Publication Date: 2017-02-22
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Based on the current situation that it is difficult to separate and remove Cl from mixed waste plastics, the present invention provides a method for dechlorination of waste plastics based on steam flow dispersion blowing and the corresponding implementation system

Method used

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  • A method and system for dechlorination of waste plastics based on steam flow dispersion blowing
  • A method and system for dechlorination of waste plastics based on steam flow dispersion blowing
  • A method and system for dechlorination of waste plastics based on steam flow dispersion blowing

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Embodiment 1

[0034] Example 1: Waste plastic 1 contains PE, PP, PS, PVC, etc.; comes from domestic waste; and is slightly polluted by food residues. The waste plastic needs to be pyrolyzed and gasified to produce combustible gas. Using the waste plastic dechlorination method based on steam flow dispersion and blow-off of the present invention, the preliminarily broken waste plastic 1 is sent to the dryer 2, and the dryer 2 adopts a rotary kiln type, and the steam generated is sent to the dechlorinator after passing through the purifier 7. Chlorine Reactor 3. Purifier 7 is a cyclone dust collector. At the same time, the steam 9 from the waste heat boiler of the system is 1.0MPa, and the waste steam generated in the drier 2 is injected by this high-pressure steam, and sent to the dechlorination reactor 3 together, see figure 2 . The waste plastic 1 is heated to 305° C. in the dechlorination reactor 3 . Dechlorination reactor 3 is a rotary kiln reactor with a feed rate of 1.25t / h; the to...

Embodiment 2

[0035] Example 2: Waste plastic 1 contains PE, PP, PVC, etc.; it is waste plastic sorted from papermaking waste. The waste plastic needs to be pyrolyzed to produce fuel oil, combustible gas and charcoal. Using the waste plastics dechlorination method based on steam flow dispersion and blow-off of the present invention, the waste plastics 1 are preliminarily crushed and then sent to the dryer 2. The dryer 2 adopts a rotary kiln dryer and is heated by flue gas discharged from the waste heat boiler of the system. The steam generated in the dryer 2 is sent to the dechlorination reactor 3, as figure 1 . Waste plastic 1 is heated to 318° C. in dechlorination reactor 3 . The dechlorination reactor 3 is a shaftless spiral reactor that can be reversed, and the feed rate is 1.1t / h; the superheated steam discharged from the boiler of the paper mill is 280°C, and is sent to the dechlorination reactor 3 after depressurization. The steam volume of the part is 495Nm 3 / h; It can efficien...

Embodiment 3

[0036] Example 3: Waste plastic 1 contains PE, PP, PVC, etc.; comes from medical waste; and is polluted by disinfectant water, antibiotics, and saline for injection. The waste plastic 1 needs to be pyrolyzed to produce fuel oil, combustible gas and charcoal. Using the waste plastic dechlorination method based on steam flow dispersion and blow-off of the present invention, the waste plastic 1 is directly sent to the dryer 2, and the dryer 2 adopts a vacuum paddle dryer, and the external jacket is produced by a waste heat boiler of the system 0.6MPa steam heating. The steam generated in the dryer 2 is directly injected into the dechlorination reactor 3 by the steam 9 with a pressure of 0.6 MPa. The waste plastic 1 is heated to 330° C. in the dechlorination reactor 3 . Dechlorination reactor 3 is a paddle-stirred reactor with a feed rate of 1.0t / h; the total amount of steam is 467Nm 3 / h; can efficiently separate organic Cl and inorganic Cl in waste plastics, and the separatio...

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Abstract

The invention relates to a vapor steam-based scattered blow-off waste plastic dechlorination method and system. The principle is that HCl is released when polyvinyl chloride (PVC) plastics are melted, and the HCl released by the waste plastics is taken out by utilizing vapor; and meanwhile, the inorganic chlorine salt mixed into the waste plastics can be converted into HCl so as to be separated out by the steam, so that the Cl in the waste plastics is separated. The system disclosed by the invention comprises a waste plastic drier, a dechlorination reactor, a vapor source, a scrubber, a necessary purifier, a gas tank and a served pyrolysis reactor. The vapor generated by the drier is directly fed into the dechlorination reactor or is subjected to necessary purification to be fed into the dechlorination reactor, and the vapor serves as one of the vapor sources; and insufficient vapor is supplied by an external vapor source. According to the method and system, the aim of separating Cl from the waste plastics mixed with PVC and inorganic chlorine salt can be achieved, and the gas produced during dechlorination is high in purity, and waste is avoided.

Description

technical field [0001] The invention relates to a method and system for dechlorinating waste plastics based on steam flow dispersion blowing. Background technique [0002] Plastic products are used more and more widely in our lives, and at the same time, a large amount of waste plastics are discarded into various waste streams, causing serious pollution to the environment. For example, there are a lot of waste plastics in municipal solid waste (MSW), medical waste and some industrial wastes, which also contain PVC and even inorganic chlorine salts, which makes these wastes not only produce HCl pollution problems when incinerated , but also there is a hidden danger of dioxin formation. [0003] Polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), and polystyrene (PS) among general thermoplastics are the largest in the waste of daily necessities, and they are also the ones with the highest content in domestic waste and medical waste. Types of plastic waste. Thes...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J11/14
CPCY02W30/62
Inventor 陈德珍袁国安曹琼敏王欢
Owner TONGJI UNIV
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