Rotary Wheel Catalyst Circulation for Waste Plastic Decomposition
Solution Overview
Problem
Current methods for decomposing waste plastics and organic matter, particularly medical wastes, are inefficient, costly, and generate toxic gases, with existing apparatuses requiring large scales and frequent catalyst replacement due to wear and poor agitation efficiency, and fail to effectively handle plastics like polyvinylchloride and Teflon™.
Innovation Solution
A decomposition apparatus utilizing a rotary wheel for efficient catalyst and waste plastic/organic matter circulation, combined with a mixing vessel for enhanced agitation and separation of metals and inorganic matter, which extends catalyst life and reduces apparatus size while achieving high-efficiency decomposition without harmful gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional decomposition methods using drum-shaped reaction vessels with agitation blades are used, then decomposition treatment can be performed, but the apparatus size becomes large and treatment cost increases
Solution Approach 1:
The invention replaces the conventional stationary drum-shaped reaction vessel with a dynamic spherical reaction vessel that rotates. This rotation creates dynamic mixing and contact between the catalyst and waste plastic, improving decomposition efficiency while reducing the overall apparatus size. The spherical shape with rotation capability allows for more compact design compared to large drum vessels.
Solution Approach 2:
The invention replaces the conventional mechanical agitation blade system with a rotation-based mixing system. Instead of using large agitation blades inside a drum, the entire spherical reaction vessel rotates, creating tumbling motion that mixes the catalyst and waste plastic effectively. This substitution reduces the mechanical complexity and size of the apparatus.
2Productivity
If conventional decomposition methods are used, then waste plastic can be treated, but catalyst life is short due to wear requiring frequent replacement
Solution Approach 1:
The rotation of the spherical reaction vessel creates gentle tumbling motion that reduces mechanical stress and wear on the catalyst particles compared to conventional agitation blades. This dynamic mixing method extends catalyst life by minimizing abrasion while maintaining effective contact between catalyst and waste plastic.
Solution Approach 2:
The invention changes the physical state and motion parameters of the catalyst by using rotation-based mixing instead of blade agitation. This parameter change from high-shear mechanical mixing to low-shear rotational tumbling reduces catalyst wear and extends its operational life.
3Productivity
If conventional drum-shaped reaction vessels with agitation blades are used, then decomposition can occur, but the apparatus structure becomes complex
Solution Approach 1:
The invention simplifies the apparatus structure by replacing complex internal agitation blade mechanisms with a simple rotation capability of the spherical vessel. This dynamic approach reduces mechanical complexity while maintaining or improving decomposition performance through the tumbling motion of the spherical reactor.
Solution Approach 2:
The invention divides the decomposition process into distinct functional zones within the spherical reaction vessel, with the rotation mechanism providing mixing and the catalyst layer providing decomposition. This segmentation allows for a simpler overall structure compared to integrated drum-agitator systems.
4Productivity
If incineration treatment is used for waste plastics, then quick disposal is achieved, but toxic gases such as dioxin are generated
Solution Approach 1:
The invention changes the thermal parameters of the decomposition process by operating at controlled temperatures below complete incineration, using catalyst-assisted decomposition instead of high-temperature combustion. This parameter change allows for rapid waste breakdown without generating toxic gases associated with incineration.
Solution Approach 2:
The invention introduces a catalyst as an intermediary substance that facilitates the decomposition of waste plastic at lower temperatures. This catalyst-mediated process replaces direct incineration, achieving quick disposal without the harmful byproducts of combustion.
5Productivity
If landfilling is used for waste plastics, then disposal is achieved, but the matter is not decomposed and landfill sites become scarce
Solution Approach 1:
The invention changes the environmental parameters from anaerobic landfill conditions to controlled aerobic decomposition conditions with optimized temperature and catalyst presence. This allows for actual decomposition of waste plastic rather than mere storage, eliminating the problem of landfill site scarcity.
Solution Approach 2:
The invention uses a catalyst as an intermediary to enable decomposition in a controlled system, replacing the passive landfill approach. This catalyst-facilitated decomposition achieves waste breakdown without requiring extensive landfill sites.
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
The apparatus achieves miniaturization and high-efficiency decomposition of waste plastics and organic matter, extending catalyst life five to twenty times, reducing reaction vessel size by one-third to two-fifths, and increasing processing capacity, while effectively managing toxic gases and metals, suitable for on-site use in hospitals.
Implementation Method 1
the work of the catalyst enhances the decomposition of the organic matter, and thus the organic matter is gasified
Implementation Method 2
means for circulation/agitation using a rotary wheel
Implementation Method 3
supplying hot air into the reaction vessel using a blower
Data Source
Figure 1
Figure 2~3
Figure 4
AI summary
A decomposition apparatus and a decomposition system for high-efficiency decomposition of waste plastic and organic matter, in particular medical waste formed of varieties of plastic, are provided by introduction of a catalyst circulating means using a rotary wheel and/or introduction of a mixing vessel.