Heated Plastic Transport for Stable Pyrolysis Reactor Feeding
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Solution Overview
Problem
Existing chemical recycling processes face challenges in maintaining consistent and efficient pyrolysis of plastic materials due to temperature fluctuations and air ingress, leading to decomposition and coke formation, which affects reactor performance and product quality.
Innovation Solution
A system and method involving a pump with dual heating and cooling zones, an angled and insulated pipe with electric heat tracing, and sequential reactor feeding to maintain plastic material at a controlled temperature range (265-310°C) during transport, preventing decomposition and ensuring consistent feedstock delivery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If plastic material is transported at ambient temperature, then energy consumption is reduced, but the material solidifies and blocks the transport system
Solution Approach 1:
The patent applies parameter changes by maintaining the plastic material in a molten state through controlled temperature parameters during transport. The system uses heating elements and insulation to keep the material above its melting point (typically above 100°C for polyethylene), ensuring it remains fluid and transportable without solidifying, while optimizing energy consumption through efficient heat management.
2Productivity
If plastic material is heated to high temperature for pyrolysis, then pyrolysis efficiency is improved, but decomposition and coke formation occur during transport
Solution Approach 1:
The patent applies local quality by creating different thermal conditions in different zones of the system. The transport line uses moderate heating (maintaining molten state without excessive temperature) to prevent solidification, while the pyrolysis reactor applies high temperature (above 350°C) for efficient decomposition. This localized temperature control prevents premature decomposition and coke formation during transport while ensuring high pyrolysis efficiency in the reactor.
Solution Approach 2:
The patent applies preliminary action by pre-heating the plastic material to and maintaining it in the molten state during transport before pyrolysis begins. This preliminary thermal treatment ensures the material is in the correct physical state for efficient pyrolysis while preventing decomposition by controlling the temperature within a specific range (above melting point but below decomposition temperature) during the transport phase.
3Power
If air is present during plastic material transport, then oxygen is available for combustion, but oxidation and coke formation occur
Solution Approach 1:
The patent applies inert atmosphere by creating an oxygen-excluded environment during the transport of molten plastic material. The system uses nitrogen gas blanketing or vacuum sealing in the transport lines to prevent contact between the molten plastic and atmospheric oxygen, thereby preventing oxidation and coke formation while maintaining the material in a transportable molten state.
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
Ensures stable pyrolysis by maintaining plastic material within a target temperature range, preventing coke formation and air ingress, thereby enhancing reactor efficiency and product yield.
Implementation Method 1
heating and densifying plastic material
Implementation Method 2
insulated pipe with electric heat tracing
Implementation Method 3
pyrolysing the plastic material in the one or more reactors
Implementation Method 4
electric heat tracing
Data Source
AI summary
A method for pyrolysing plastic material. The method comprises the steps of: heating and densifying plastic material; transporting the plastic material to one or more reactors; and pyrolysing the plastic material in the one or more reactors. The plastic material is maintained in a heated state during the transporting step. A system for pyrolysing plastic material is also provided.