Hydrothermal Oxidation Reactor with Segmented Thermal Zones
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Solution Overview
Problem
Existing hydrothermal and wet oxidation reactors face challenges with corrosion, salt build-up, and inefficient heat transfer, particularly in treating halogenated compounds, due to limitations in reactor design and flow regimes, leading to reduced treatment capacity and increased maintenance needs.
Innovation Solution
A reactor design with improved heat transfer efficiency through forced circulation of the oxidizing fluid and separate cooling and heating loops, along with a turbulence-inducing introduction channel system, allows for better control of reaction conditions and thermal management, enhancing the treatment of organic materials regardless of feed flow rates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a simple tubular reactor geometry is used, then the reaction effectiveness is improved, but corrosion and salt build-up occur at the walls leading to plugs
Solution Approach 1:
The reactor is divided into two distinct zones: a hot zone for oxidation reactions and a cold zone for cooling and salt deposition prevention. This segmentation allows the reaction zone to maintain high temperature for effectiveness while the cold zone prevents corrosion and salt build-up by keeping temperatures below salt deposition points.
Solution Approach 2:
A confinement tube is introduced as an intermediary element between the reaction medium and the reactor walls. This tube protects the outer reactor structure from direct exposure to corrosive conditions and salt deposits, while still allowing heat transfer and reaction to proceed effectively.
2Reliability
If a confined reaction zone is used to prevent corrosion, then corrosion resistance is improved, but heat transfer efficiency decreases
Solution Approach 1:
Different parts of the reactor have different thermal properties: the hot zone maintains high temperature for oxidation while the cold zone maintains low temperature for salt prevention. The confinement tube wall thickness and material are optimized to provide adequate protection while maintaining heat transfer efficiency in the reaction zone.
3Productivity
If the oxidizing fluid flow rate is increased to improve treatment capacity, then productivity is improved, but heat transfer control becomes less efficient
Solution Approach 1:
The system uses temperature monitoring and feedback control to adjust the oxidizing fluid flow rate and cooling intensity. This allows the reactor to maintain optimal temperature control even at high treatment capacities, preventing both overheating and excessive cooling that could cause salt deposition.
4Reliability
If a stirred double jacket reactor is used, then corrosion and salt build-up are reduced, but device complexity increases
Solution Approach 1:
The confinement tube serves multiple functions simultaneously: it acts as a reaction vessel, a heat exchanger, and a protective barrier against corrosion and salt deposition. By merging these functions into a single integrated component, the overall device complexity is reduced despite the sophisticated dual-zone design.
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 significantly increases continuous treatment capacity, improves reaction efficiency, reduces maintenance needs, and ensures robust operation by controlling heat transfer and turbulence, while simplifying reactor dimensioning and allowing for industrial-scale extrapolation.
Implementation Method 1
at least one first cooling system configured to cool the oxidizing fluid at the oxidizing fluid inlet in a first portion of the peripheral zone
Implementation Method 2
at least one heating system to heat the oxidizing fluid in a second portion of the peripheral zone, prior to its introduction into the confinement zone
Implementation Method 3
an introduction channel stirring system adapted to create turbulence in the fluid loaded into the introduction channel
Implementation Method 4
at least one second cooling system adapted to create, in the loaded fluid, a temperature gradient along the introduction channel
Implementation Method 5
a confinement member defining an internal zone, called a confinement zone, for containing the reaction medium, and an external zone, called a peripheral zone
Implementation Method 6
HydroThermal Oxidation (HTO) and Wet Oxidation (WO) allow, by means of pressurised water at a certain temperature and in the presence of an oxidant, the total or partial decomposition of organic material
Data Source
AI summary
A reactor for hydrothermal oxidation treatment of an organic material in a reaction medium, comprising: a confinement member housed in a chamber and defining a confinement zone and a peripheral zone; at least one inlet for an oxidising fluid into the peripheral zone; a first cooling system, with an external circulation cold loop having a fluid inlet and outlet, opening into a first portion of the peripheral zone; a heating system, with an external circulation hot loop having a fluid inlet and outlet opening into a second portion of the peripheral zone; a channel with a mouth, a channel stirring system; a second cooling system for creating a temperature gradient along the channel between a cold temperature and the reaction temperature; each circulation loop being equipped with a circulator and with a heat exchanger.