Direct Plasma Heating for Solid Feedstock Devolatization
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Solution Overview
Problem
Current pyrolytic processes for waste-to-energy conversion are inefficient, producing excessive hazardous emissions, bulky equipment, and requiring high energy input due to indirect heating and lengthy conversion times, leading to inefficient energy production and environmental concerns.
Innovation Solution
A method and device for direct heating of solid feedstock with hydrogen gas at elevated temperatures within a jacketed system, converting it into a gas and solid stream, which enhances energy efficiency, reduces emissions, and allows for modular, scalable, and portable waste processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If indirect heating is used to create pyrolytic conditions, then the feedstock can be processed, but heat transfer efficiency is poor and device size increases
Solution Approach 1:
The patent replaces indirect thermal heating with direct plasma heating. The plasma炬 directly contacts and heats the feedstock particles, substituting the indirect conduction/convection heating mechanism with a direct energy transfer mechanism that achieves higher temperatures faster and with more compact equipment.
Solution Approach 2:
The patent employs periodic plasma discharge cycles to heat the feedstock. The plasma is activated in periodic pulses, allowing efficient energy transfer to the feedstock particles while maintaining compact reactor design, avoiding continuous high-energy input that would require larger equipment.
2Temperature
If longer travel paths are implemented for feedstock, then pyrolytic conditions can be achieved, but conversion time increases and process efficiency decreases
Solution Approach 1:
The patent substitutes extended thermal processing paths with direct plasma heating. The plasma炬 delivers concentrated thermal energy directly to feedstock particles, achieving pyrolytic temperatures rapidly without requiring long residence times or extended travel paths through traditional heaters.
Solution Approach 2:
The patent applies localized plasma heating directly at the feedstock processing zone. The plasma炬 concentrates energy delivery at specific locations where feedstock particles are processed, achieving high temperatures locally and rapidly without heating entire long pathways, thus reducing conversion time.
3Power
If raw municipal solid waste is burned directly, then energy production occurs, but heavy metal emissions and hazardous waste increase
Solution Approach 1:
The patent processes feedstock in an inert or controlled atmosphere using plasma heating rather than direct combustion. This prevents complete oxidation and heavy metal vaporization that occur in traditional burning, reducing hazardous emissions while still producing energy through controlled thermal decomposition and subsequent combustion of the pyrolyzate.
Solution Approach 2:
The patent replaces direct combustion with plasma-assisted pyrolysis followed by controlled combustion of products. The plasma炬 breaks down complex waste materials at high temperatures in a controlled manner, separating organic energy-containing compounds from inorganic heavy metals, allowing energy recovery while minimizing hazardous emissions.
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 process achieves higher methane production in the gas stream, reducing emissions, energy costs, and equipment size, while enabling efficient conversion of waste into clean energy with minimal environmental impact.
Implementation Method 1
contacting the solid feedstock with a heated gas, comprising hydrogen, inside the jacketed system at a temperature of about 500° C. to about 1000° C.
Implementation Method 2
The process comprises treating the solid feedstock to a produce a particle size laying between 1 cm3 and 100 cm3. The method further comprises passing the solid feedstock into a jacketed system.
Implementation Method 3
Pyrolysis refers to thermochemical decomposition of a solid feedstock, such as solid waste. Pyrolysis occurs at elevated temperatures without the participation of oxygen.
Implementation Method 4
This decomposition is accompanied by devolatization; that is, the escape of volatile gases from the solid feedstock.
Data Source
AI summary
Provided herein is a method for devolatizing a solid feedstock. The solid feedstock is treated to a produce a particle size laying between 1 cm3 and 100 cm3. The solid feedstock is passed into a device connected to an outlet of a compaction screw auger comprising an assembly including a solid feedstock injector, a retort, a side arm for injecting a heated gas comprising hydrogen, and a process auger. The solid feedstock is contacted with the heated gas at a temperature of 500° C. to 1000° C. for a time of 60 seconds to 120 seconds, whereby the solid feedstock is converted into a gas stream and a solid stream.