Plastic Pyrolysis System for Diesel Conversion
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Solution Overview
Problem
The high percentage of plastic waste in landfills due to its non-biodegradability and the inefficiencies of current recycling methods, such as labor-intensive sorting and toxin-releasing incineration, necessitate a more effective conversion of plastic into usable fuels like diesel and heavy fuel oil.
Innovation Solution
A system that utilizes a pyrolysis process to convert plastic feedstock into diesel and heavy fuel oil, involving a feedstock-delivery system to reduce oxygen levels, a pyrolysis device with temperature-controlled zones, condensers to convert gases into fuel oils, and a hydrogenation vessel to produce ultra-low sulfur fuels, with heat circulation systems for efficient energy use.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If plastic waste is incinerated to generate energy, then energy production is improved, but harmful toxins are released into the environment
Solution Approach 1:
The patent applies inert atmosphere by conducting pyrolysis in an oxygen-free or low-oxygen environment. The system uses nitrogen gas to create an inert atmosphere in the reaction chamber, preventing complete combustion and toxin formation while still enabling thermal decomposition of plastic into useful fuels. This resolves the contradiction by maintaining energy production through thermal conversion without the harmful emissions associated with open incineration.
2Adaptability or versatility
If plastic is mechanically recycled through sorting and reprocessing, then plastic products can be reused, but labor and management resources are heavily consumed
Solution Approach 1:
The patent applies parameter changes by transforming plastic waste from its original solid polymer state into liquid hydrocarbon fuels through pyrolysis and hydrogenation. This fundamental parameter change (from solid plastic to liquid fuel) eliminates the need for mechanical sorting and reprocessing, as the chemical conversion produces standardized fuel products that can be directly used or distributed, greatly simplifying the overall process.
3Ease of manufacture
If plastic waste is sent to landfills, then disposal is simple, but plastic accumulates indefinitely due to non-biodegradability
Solution Approach 1:
The patent applies the blessing in disguise principle by converting the harmful, accumulating plastic waste into beneficial hydrocarbon fuels. The pyrolysis process transforms non-biodegradable plastic into useful diesel and heavy fuel oil, turning an environmental problem into a valuable resource. This eliminates landfill accumulation while maintaining operational simplicity through automated feedstock processing.
4Use of energy by moving object
If pyrolysis is used to convert plastic into fuel, then plastic waste is converted into usable energy, but multiple processing stages are required to achieve low sulfur content
Solution Approach 1:
The patent applies merging by combining multiple processing functions into an integrated system. The pyrolysis unit, hydrogenation reactor, and distillation apparatus are connected in sequence to form a unified conversion system. The hydrogenation vessel receives pyrolysis output and performs sulfur removal in-situ, while the distillation system separates products by boiling point. This merged approach achieves low-sulfur fuel production through coordinated processing stages rather than separate operations.
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 system effectively converts plastic waste into marketable diesel and heavy fuel oil with low sulfur content, addressing the environmental and management issues of plastic waste while providing a sustainable fuel source.
Implementation Method 1
a pyrolysis device configured to elevate a temperature of the feed stock upon receiving the feed stock through the entryway. Therein the feed stock is maintained in a substantially inert environment
Implementation Method 2
gases are delivered to condensers configured to convert the gases into fuel oils
Implementation Method 3
A distillation vessel receives and heats the fuel oils to elevated temperatures while being agitated. Naphtha is removed and condensed.
Implementation Method 4
A hydrogenation vessel receives the remaining liquid fuel from the distillation vessel, the hydrogenation vessel mixes the fuel liquid with H2 at a high pressure while any excess fuel oil from the process is recirculated to and from an expansion vessel to create ultra low sulphur converted fuel oils
Data Source
AI summary
Described is a system for producing primarily diesel with some heavy fuel oil from plastic feedstock. The feedstock is received into a pyrolizer. There are two zones in the pyrolizer—one where the temperature is elevated during conveyance, and a second where the temperature is maintained. A distillation vessel receives fuel oils from the pyrolizer and agitates the oils at high temperature. A hydrogenation vessel then mixes the fuel liquid with H2 at a high pressure while recirculating to and from an expansion vessel to create converted fuel oil. A diesel distillation tank receives the converted fuel oil and creates diesel gas, which is then condensed to form a usable diesel product. Any remaining fuel oil is sent the heavy fuel oil tank.