Steam Plasma Hydrolysis for ODS Destruction
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Solution Overview
Problem
Current methods for ozone depleting substances (ODS) destruction, such as incineration and plasma technologies, face challenges including high energy consumption, production of hard-to-remove pollutants like Cl2, F2, and CF4, and the need for expensive argon plasma, along with potential toxic by-product formation.
Innovation Solution
A two-step process using steam plasma in a reactor, where precursor materials are hydrolyzed at high temperature and then oxidized at medium temperature with immediate quenching to prevent unwanted by-products, employing a non-transferred direct current steam plasma torch and a three-zone reactor with refractory lining, and utilizing steam as the primary plasma forming gas to convert ODS into CO, HCl, and HF, followed by instantaneous water quenching.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If incineration is used to destroy ODS, then destruction capability is achieved, but large quantities of fossil fuels are required and toxic by-products (dioxins, furans) are formed
Solution Approach 1:
The invention changes the fundamental parameter of the destruction mechanism from thermal oxidation to plasma steam hydrolysis. This parameter change allows destruction at lower temperatures without forming toxic by-products like dioxins and furans, while also eliminating the need for large quantities of fossil fuels.
Solution Approach 2:
The invention substitutes the mechanical/thermal combustion process with a plasma-based chemical process. The plasma steam hydrolysis mechanism replaces thermal oxidation, fundamentally changing how ODS are destroyed and eliminating the formation of harmful combustion by-products.
2Reliability
If argon plasma technology is used, then ODS destruction is achieved, but high flow rates of high purity argon are required making it expensive
Solution Approach 1:
The invention replaces expensive high purity argon with water, which is abundant and inexpensive. The plasma is generated using water steam instead of requiring continuous supply of costly argon gas, making the process economically viable while maintaining destruction capability.
Solution Approach 2:
The system uses water, which is readily available and self-regenerating through the hydrolysis process, instead of requiring external supply of expensive argon. The process essentially uses itself to sustain the plasma reaction.
3Reliability
If thermal oxidation is used as main destruction mechanism, then ODS are destroyed, but Cl2, F2 and CF4 are produced which are hard to remove
Solution Approach 1:
The invention changes the chemical mechanism from oxidation to hydrolysis. This parameter change fundamentally alters the reaction products from toxic halogens and fluorocarbons to soluble acids (HCl, HF) that are easily removable through standard scrubbing technologies.
Solution Approach 2:
The invention converts the harmful ODS molecules into beneficial or easily manageable substances. The hydrolysis process transforms toxic ODS into soluble acids that can be readily neutralized and removed, turning a harmful situation into a manageable one.
4Device complexity
If incinerators operate without secondary combustion chambers, then process simplicity is maintained, but toxic products of incomplete combustion are emitted
Solution Approach 1:
The invention replaces the need for complex multi-chamber incineration systems with a single-stage plasma hydrolysis process. The plasma mechanism inherently achieves complete destruction without requiring secondary combustion chambers, maintaining simplicity while eliminating toxic by-products.
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
This approach effectively reduces the formation of toxic substances and allows for efficient removal of acid gases, resulting in a cleaner effluent gas stream with mainly CO2 emission, addressing the inefficiencies and environmental concerns of existing technologies.
Implementation Method 1
a non transferred direct current steam plasma torch
Implementation Method 2
Transform Electrical Energy to Thermal Energy
Implementation Method 3
precursor materials are hydrolyzed at high temperature
Implementation Method 4
steam plasma in a reactor
Implementation Method 5
oxidized at medium temperature with immediate quenching
Implementation Method 6
combustion zone of the reactor where combustion oxygen or air is injected
Implementation Method 7
immediate quenching of the resulting gas stream to avoid the formation of unwanted by-products
Implementation Method 8
followed by instantaneous water quenching
Data Source
Figure 1a
Figure 1b
Figure 2
AI summary
A two step process for the destruction of a precursor material using a steam plasma in a three zone reactor wherein the precursor material is hydrolyzed as a first step in the high temperature zone of the reactor, followed by a second step of medium temperature oxidation of the reactant stream in the combustion zone of the reactor where combustion oxygen or air is injected and immediate quenching of the resulting gas stream to avoid the formation of unwanted by-products. A related apparatus includes a non transferred direct current steam plasma torch, an externally cooled three zone steam plasma reactor means for introducing the precursor material into the plasma plume of the plasma torch, means for introducing the combustion air or oxygen into the combustion zone, means for exiting the reactant mixture from the reactor and means for quenching the reactant mixture located at the exit end of the reactor.