Supercritical Water Oxidation Vortex Reactor with Subcritical Wash Stream
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Solution Overview
Problem
Conventional supercritical water oxidation (SCWO) reactors face challenges due to external heating requirements, which lead to high thermal stresses and costly reactor materials, as well as issues with ionic substances precipitating and forming deposits on reactor surfaces, reducing efficiency and operational longevity.
Innovation Solution
A supercritical water oxidation flame-piloted vortex reactor design that uses a hydrothermal flame to maintain supercritical conditions internally, with a subcritical wash stream creating a transcritical transition annulus to prevent scaling and maintain efficient operation by keeping reactor surfaces below the critical temperature, thereby preventing ionic substance deposition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If external heating is used to maintain supercritical conditions, then the reactor can achieve and maintain the required temperature, but the reactor walls experience excessive thermal stress requiring thick walls and expensive materials
Solution Approach 1:
A subcritical wash stream is introduced as an intermediary fluid between the heat source and the reactor walls. This wash stream absorbs excess heat, preventing direct thermal contact between the supercritical oxidation zone and the reactor wall, thereby reducing thermal stress while maintaining the required supercritical temperature in the reaction zone
Solution Approach 2:
The reactor interior is segmented into distinct zones: a supercritical core region where oxidation occurs, a transcritical transition annulus for temperature gradient management, and a subcritical outer region where the wash stream contacts the reactor wall. This segmentation allows each zone to serve its specific function while protecting the reactor structure
2Productivity
If the reactor operates at supercritical conditions, then oxidation efficiency is improved, but ionic substances precipitate and form deposits on reactor surfaces reducing operational efficiency
Solution Approach 1:
The subcritical wash stream serves as a protective intermediary layer that contacts the reactor wall surface, preventing ionic precipitates formed in the supercritical zone from depositing on the wall. The wash stream continuously flows over the surface, keeping it clean and maintaining heat transfer efficiency
Solution Approach 2:
Different regions of the reactor are maintained at different temperatures and phases: the core region operates at supercritical conditions for efficient oxidation, while the wall-contacting region operates at subcritical conditions to prevent precipitation. This local differentiation allows both high productivity and low deposition
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 design allows for efficient oxidation of organic waste with reduced thermal stress on the reactor, preventing scaling and maintaining reactor efficiency, enabling the use of less expensive materials and improving waste processing capabilities.
Implementation Method 1
a burner assembly arranged at the bottom of the reactor shell and configured to deliver fuel into the enclosed volume... igniting the fuel to generate in the enclosed volume a hydrothermal flame
Implementation Method 2
a transcritical transition annulus arranged radially between the supercritical core region and the subcritical outer region and including water transitioning through its critical point
Implementation Method 3
oxidation of organic waste with reduced thermal stress on the reactor, preventing scaling
Data Source
AI summary
A supercritical water oxidation vortex reactor has a reactor shell configured to contain a pressurized and heated material including water, a burner assembly configured to create a supercritical core region in the material in the reactor shell, the supercritical core region including water above its critical point, an injector assembly configured to inject into the enclosed volume a subcritical wash stream including water below its critical point and an aspirator arranged in the enclosed volume and configured to remove a processed flow including purified water from an upper portion of the supercritical core region. The supercritical water oxidation vortex reactor is configured with an upward helical flow to transfer precipitated ionic compounds out of the supercritical core region, through a transcritical intermediate region, and into the subcritical wash stream where they re-dissolve.