SCWO Feed Stream Parameter Control
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Solution Overview
Problem
Supercritical water oxidation (SCWO) reactors face issues with fouling, corrosion, and clogging due to the insolubility of inorganic compounds, which requires frequent reconfiguration and maintenance, and existing methods are inefficient in managing parameters like contaminant concentration, salt content, viscosity, and calorific value for continuous operation.
Innovation Solution
A multi-step process for preparing a supercritical water oxidation feed stream by monitoring and adjusting parameters such as contaminant concentration, total dissolved solids, viscosity, salt concentration, and calorific value through various analytical methods and additives to create a compatible feed stream, allowing for continuous reactor operation without the need for offline reconfiguration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If inorganic compounds are present in the feed stream, then the SCWO process can treat diverse waste types, but fouling, corrosion, and clogging occur due to insolubility of inorganic compounds
Solution Approach 1:
The patent applies preliminary action by adjusting feed stream parameters (pH, redox potential, dissolved oxygen) and removing inorganic compounds before the SCWO process begins. This prevents the formation of insoluble inorganic salts that would cause fouling and clogging, while still allowing the reactor to handle diverse waste types.
Solution Approach 2:
The patent changes physical and chemical parameters of the feed stream, specifically controlling pH between 2-10, redox potential between -200mV to +200mV, and dissolved oxygen concentration between 1-10 mg/L. These parameter adjustments optimize solubility and prevent precipitation of inorganic compounds during the SCWO process.
2Productivity
If feed stream parameters are not optimized, then the SCWO reactor can operate continuously, but fouling and corrosion increase requiring offline reconfiguration
Solution Approach 1:
The patent implements feedback control by continuously monitoring feed stream parameters (pH, redox potential, dissolved oxygen, inorganic compound concentrations) and adjusting the feed stream composition accordingly. This ensures parameters remain within optimal ranges for continuous operation without fouling or corrosion.
Solution Approach 2:
The system performs preliminary adjustments to feed stream parameters before entry into the SCWO reactor, including pH adjustment to 2-10, redox potential adjustment to -200mV to +200mV, and removal of inorganic compounds. This prevents downstream issues that would require offline reconfiguration.
3Adaptability or versatility
If multiple waste streams are combined without parameter optimization, then diverse contaminants can be treated, but contaminant concentration, salt content, viscosity, and calorific value become uncontrolled
Solution Approach 1:
The patent controls multiple feed stream parameters simultaneously: contaminant concentration (total organic carbon), salt content (total dissolved solids), viscosity, and calorific value. By adjusting pH, redox potential, and dissolved oxygen, the system maintains these parameters within optimal ranges for efficient SCWO treatment of mixed waste streams.
Solution Approach 2:
The system performs preliminary optimization of feed stream parameters before SCWO treatment, including adjusting contaminant concentration to appropriate levels, controlling salt content through pH adjustment, and ensuring adequate calorific value. This enables controlled treatment of diverse waste streams without compromising process efficiency.
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
Enables continuous and efficient treatment of waste streams by optimizing the feed stream parameters, reducing fouling and corrosion, and maintaining reactor compatibility, thereby improving the versatility and efficiency of SCWO processes for diverse waste types, including halogenated wastes and organic contaminants.
Implementation Method 1
heating and pressurizing water to a supercritical state, typically at temperatures between 60° and 650° C. and pressures of at least 22 megapascals (MPa). In the supercritical state, water is fully miscible with both air and organic compounds
Implementation Method 2
Organic compounds dissolved in supercritical water will react with oxygen in air to form carbon dioxide and water, leading to full mineralization of organic contaminants in the feed stream
Implementation Method 3
the combustion and oxidation of organic matter to provide the temperature requirements for supercritical operation
Data Source
AI summary
Methods of preparing a feed stream for supercritical water oxidation from at least two waste streams are described herein. The method generally involves monitoring contaminant concentration, total dissolved solids concentration, viscosity, salt concentration, and calorific value of each waste stream and combining those waste streams, and optionally a non-waste additive, into a single feed stream to achieve a specific contaminant concentration, total dissolved solids concentration, viscosity, salt concentration, and calorific value prior to supercritical water oxidation. The disclosure also describes systems capable of monitoring contaminant concentration, total dissolved solids, viscosity (solids concentration and particle size), salt concentration, and calorific value in at least two waste streams, combining those waste streams into a new feed stream, and monitoring that feed stream to ensure compatibility with continuous feed into a supercritical water oxidation reactor.