Supercritical Water Reactor Sacrificial Lining Design
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Solution Overview
Problem
Supercritical water reactors face challenges such as high reaction conditions requiring durable materials, corrosion issues, and difficulties in catalyst loading and replacement, leading to reduced safety and efficiency in treating organic wastewater.
Innovation Solution
A countercurrent tank type supercritical water reactor with a sacrificial lining and temperature-resistant thermal insulation coating, along with a catalyst tank for easy catalyst installation and replacement, addresses corrosion and blockage issues while allowing for multi-functional treatment methods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If higher temperature and pressure are used to meet reaction conditions, then decomposition efficiency is improved, but material reliability and safety are reduced
Solution Approach 1:
The reactor is divided into distinct functional zones: a water-cooled wall section for heat removal and a heating section for temperature maintenance. This segmentation allows different parts of the reactor to operate under different thermal conditions, enabling high decomposition efficiency in the reaction zone while protecting structural integrity through active cooling in critical areas.
Solution Approach 2:
A sacrificial lining is introduced as an intermediary layer between the corrosive supercritical water environment and the reactor wall materials. This lining acts as a protective barrier that sacrifices itself to prevent corrosion of the underlying stainless steel and nickel-based alloy structures, thereby maintaining material reliability under harsh operating conditions.
2Reliability
If transpiring wall or water-cooled wall reactors are used to reduce material requirements, then safety reliability is improved, but energy utilization efficiency is reduced
Solution Approach 1:
Instead of uniformly cooling the entire reactor wall, the invention applies water cooling only to specific sections where thermal stress and corrosion risks are highest. The heating section maintains optimal reaction temperature without excessive cooling, thereby minimizing energy loss while still ensuring safety reliability in critical areas.
3Productivity
If catalyst is used to improve conversion rate, then reaction efficiency is improved, but catalyst loading and replacement difficulty increase
Solution Approach 1:
The catalyst is segregated into a separate, removable container within the reactor chamber. This segmentation allows the catalyst to be easily accessed, loaded, and replaced without disassembling the entire reactor system, significantly improving operational ease while maintaining high conversion rates through efficient catalyst placement.
4Duration of action of stationary object
If corrosion-resistant materials are used to extend service life, then durability is improved, but material cost and complexity increase
Solution Approach 1:
The sacrificial lining is designed as a consumable component that is cheaper than the underlying structural materials. It is intentionally allowed to corrode and be replaced periodically, protecting the expensive stainless steel and nickel-based alloy structures from corrosion. This approach extends the overall service life of the reactor while avoiding the need to use expensive corrosion-resistant materials throughout the entire structure.
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 reactor design reduces material costs, prevents corrosion and blockages, and simplifies catalyst management, enhancing safety and efficiency in treating high-density organic wastewater.
Implementation Method 1
temperature-resistant thermal insulation coating
Implementation Method 2
sacrificial lining... The lining can prevent corrosion of the reactor wall
Implementation Method 3
Organic matter and oxygen can be dissolved in any proportion with the SCW converting heterogeneous reaction to homogeneous reaction
Implementation Method 4
countercurrent tank type supercritical water reactor... leading into a stream of cold fluid to isolate the bearing wall
Implementation Method 5
SCWO makes use of the special features of water in a supercritical state to completely decompose organic matter through quick oxidation reaction
Data Source
AI summary
A countercurrent tank type supercritical water reactor with a sacrificial lining, comprising a cylinder body and a catalyst tank arranged inside, the upper part of the cylinder body is connected with a top cover, and the lower part of the cylinder body is connected with a spherical head, the inner side of the cylinder body, the inner side of the spherical head and the inner side of the top cover constitute the inner wall of the reactor, wherein the inner wall of the reactor is provided with a high temperature resistance and thermal insulation coating layer, the inner wall of the high temperature resistance and thermal insulation coating layer is provided with a sealing coating layer, and the inner wall of the sealing coating layer is provided with the sacrificial lining. The reactor is of a countercurrent tank type, which can prevent the reactor blockage caused by salt deposition.