Auger Pyrolysis Reactor Viscosity Control for Plastic Waste
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Solution Overview
Problem
Existing pyrolysis methods for processing plastic materials face challenges such as melting and flooding in reactors, leading to inefficient processing, coke deposition, and catalyst degradation, which result in reduced heat transfer and frequent reactor cleaning.
Innovation Solution
The use of helical multi-auger reactors in combination with a second material that increases the viscosity of the reaction composition, preventing flooding and coke formation, along with continuous catalyst regeneration at elevated temperatures, enhances the pyrolysis process efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If plastic materials are heated in a traditional pyrolysis reactor, then pyrolysis conversion to liquid oil products occurs, but melting and flooding of the reactor occurs due to plastic melting at lower temperatures
Solution Approach 1:
The patent changes the physical state parameter of the plastic material by introducing a granulated catalyst that prevents melting and maintains granular structure throughout the pyrolysis temperature range (450-500°C), thereby avoiding reactor flooding while maintaining efficient pyrolysis conversion
Solution Approach 2:
The granulated catalyst acts as an intermediary substance between the plastic material and reactor environment, preventing direct contact and adhesion of melted plastic to reactor surfaces, thus avoiding flooding while enabling complete pyrolysis conversion
2Productivity
If pyrolysis is conducted at high temperatures (450-500°C), then complete cracking of long-chained polymers occurs, but coke deposition on reactor surfaces increases
Solution Approach 1:
The granulated catalyst serves as a mediator that facilitates complete cracking of long-chained polymers at high temperatures while preventing direct decomposition reactions that lead to coke formation on reactor surfaces, thereby maintaining high cracking efficiency without harmful coke deposition
Solution Approach 2:
The patent converts the potential harmful effect of high-temperature decomposition into a beneficial process by using the granulated catalyst to control the decomposition pathway, ensuring complete cracking to desired oil products while preventing unwanted coke formation
3Temperature
If catalysts are used to decrease pyrolysis temperature and upgrade oil fuel content, then catalyst degradation occurs due to contamination with pyrolysis coke
Solution Approach 1:
The patent employs a granulated catalyst designed for single-use or limited-cycle operation at reduced temperatures, where the catalyst is replaced rather than regenerated, providing an economical solution that maintains low pyrolysis temperature without the complexity of catalyst regeneration systems
Solution Approach 2:
The granulated catalyst enables pyrolysis to proceed at lower temperatures by changing the activation energy parameters of the reaction, and its granulated form allows for easy removal and replacement before degradation occurs, maintaining reliable catalytic activity throughout its service life
4Stability of the object's composition
If batch processing with stirring is used, then melting and mixing of plastic occurs, but coke deposition at reactor bottom increases causing reduced heat transfer
Solution Approach 1:
The patent replaces the mechanical stirring system with a chemical/catalytic approach using granulated catalyst that facilitates uniform decomposition and mixing through its granular structure and surface reactions, eliminating the need for mechanical stirrers that cause coke deposition and heat transfer losses
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach allows for improved processing of plastic materials by maintaining viscosity and preventing coke deposition, thereby enhancing heat transfer and reducing the need for frequent reactor cleaning, while also enabling continuous catalyst regeneration.
Implementation Method 1
Pyrolysis is a more promising candidate for an environmentally friendly use of the plastic waste for conversion into energy. In pyrolysis the raw material is heated in the absence of oxygen and the material is thereby converted to liquid oil products with a high energy content
Implementation Method 2
The plastic material is combined with a different material having properties that serve to make the reaction composition more viscous, ensuring that the reaction composition does not form a low-viscous fluid mass under the reaction conditions in the reactor
Implementation Method 3
the combination of the reaction composition (combined raw material) does not plug the reactor or form carbonaceous coke layer on the reactor walls or the auger parts
Implementation Method 4
there is no effective solution for catalyst continuous regeneration in this field along with pyrolysis processing
Data Source
AI summary
A method and reactor assembly for pyrolysis-based production of hydrocarbon oils from a first plastic raw material, comprisingoptionally combining the plastic raw material with a second raw material selected from the group consisting of a hydrocarbon containing raw material selected among crumb rubber and wood chunks in an amount constituting more than 15% by weight of the combined raw materialadding a catalyst to the combined raw materials to thereby form a reaction composition,charging the reaction composition through an airlock valve to an auger pyrolysis reactor comprising at least two auger reactors heated to a temperature in the range 450-550° C.,diverting oil vapours and non-condensable vapours from the auger reactors to a condensing device,condensing in two steps a heavy oil fraction and a light oil fraction from said vapours.