Single-Pressure Vessel Waste-to-Fuel Process
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Solution Overview
Problem
Current methods for processing solid waste into fuel and recyclable streams are inefficient due to high costs and low productivity, particularly in maintaining pressure vessel closures and steam transfer efficiency in multi-vessel systems.
Innovation Solution
A single-pressure vessel system with a moveable door, condenser tank, and vacuum pump is used to process solid waste by adding water and heat, achieving efficient transformation of waste into fuel and recyclable streams with heat recovery and separation of metal, glass, and plastic streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If multiple vessel systems are used for steam transfer, then steam transfer efficiency can be improved, but system complexity and timing constraints increase
Solution Approach 1:
The patent merges multiple vessel systems into a single integrated pressure vessel that performs all necessary functions (steam generation, waste treatment, fuel processing) simultaneously. This eliminates the complexity of multiple vessels while maintaining steam transfer efficiency through direct internal steam injection and circulation within the single vessel system.
Solution Approach 2:
The single pressure vessel is designed to perform multiple functions: generating steam from water, treating solid waste through heat and pressure, separating recyclable materials, and producing fuel. This multi-functional design eliminates the need for separate vessels for each function, reducing system complexity while maintaining overall efficiency.
2Productivity
If pressure is maintained in the vessel during waste treatment, then treatment efficiency is improved, but closure attachment and removal difficulty increases
Solution Approach 1:
The closure system is designed to dynamically adapt to pressure changes. The closure can be attached when pressure is low (during loading) and automatically seals under pressure during treatment. The closure includes pressure-responsive mechanisms that maintain sealing effectiveness across varying pressure conditions, allowing efficient operation without excessive operational difficulty.
Solution Approach 2:
The closure system acts as an intermediary between the external environment and the pressurized interior. It includes intermediate sealing mechanisms and pressure equalization features that facilitate attachment and removal while maintaining the necessary pressure differential for efficient waste treatment.
3Productivity
If steam is added to the vessel for waste treatment, then fuel transformation is improved, but heat loss increases
Solution Approach 1:
The system recovers heat from the steam condensation process and uses it to preheat incoming water and maintain the thermal environment within the vessel. Heat exchangers capture thermal energy from exhaust steam and condense it to generate hot water for the treatment process, significantly reducing overall heat loss while maintaining high fuel transformation efficiency.
Solution Approach 2:
The steam injection and heat recovery process operates continuously throughout the treatment cycle. Steam is continuously generated, injected, and condensed to maintain optimal temperature and pressure conditions for waste transformation into fuel, ensuring continuous useful action without significant energy loss.
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 efficiently converts solid waste into a valuable fuel and recyclable streams with a 50-66% volume reduction, achieving energy efficiency, environmental soundness, and cost-effectiveness, while capturing and reusing heat energy.
Implementation Method 1
A heater is provided to increase the temperature of the interior volume of the vessel
Implementation Method 2
A condenser tank is in fluid communication with the interior volume of the vessel to permit selective addition of water to and evacuation of steam from the interior volume of the vessel
Implementation Method 3
A vacuum pump is in vacuum communication with the interior volume of the vessel and the condenser tank to selectively reduce pressure within the interior volume of the vessel or the condenser tank
Data Source
AI summary
A process to transform solid waste into fuel by adding water and heat to provide no more than 350 BTUs/lb of the weight of the solid waste for no more than 85 minutes. Such a process transforms the solid waste into fuel in a process time of not greater than 85 minutes. The system uses a pressure vessel; a condenser tank to permit selective addition of water to and evacuation of steam from the vessel; a heater to increase the temperature of the vessel; a vacuum pump to selectively reduce pressure within the vessel and to help evacuate steam from the vessel to the condenser tank; and a water pump to selectively add water from the condenser tank to the interior volume of the vessel. A method for converting solid waste into fuel includes loading the solid waste into a rotating pressure vessel and transforming the solid waste into fuel by adding water; reducing pressure; adding heat; and then evacuating steam. The contents are evacuated from the pressure vessel. At least some of the contents are fuel.