Composite Sparger Heat Conduction Corrosion Resistance
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Solution Overview
Problem
Existing spargers for corrosive high-temperature processes in reactor vessels have a short service life due to corrosion, and materials that are corrosion-resistant are often pyrophoric, posing a fire risk.
Innovation Solution
A composite sparger with a thermally conductive non-combustible metal substrate protected by a corrosion-resistant layer, where the substrate conducts heat away from the corrosion-resistant layer to prevent ignition, ensuring the sparger operates safely in elevated temperature and corrosive environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If corrosion resistant materials like titanium or niobium are used for the sparger, then corrosion resistance is improved, but fire risk increases due to pyrophoric properties
Solution Approach 1:
The sparger is constructed as a composite structure with a substrate tube made of thermally conductive non-combustible material (such as stainless steel) and a corrosion resistant layer (such as titanium or niobium) applied to the outer surface. This composite structure allows the sparger to simultaneously achieve both corrosion resistance from the outer layer and thermal conductivity/fire safety from the inner substrate, resolving the contradiction between using pyrophoric corrosion resistant materials and maintaining fire safety.
2Object-affected harmful factors
If duplex or super-duplex stainless steel alloys are used for the sparger, then fire safety is improved, but service life decreases due to corrosion
Solution Approach 1:
The sparger uses a composite structure where the inner substrate tube is made of thermally conductive non-combustible material (stainless steel) providing fire safety, while the outer corrosion resistant layer (titanium or niobium) provides corrosion protection. This resolves the contradiction by combining materials that individually provide fire safety and corrosion resistance, respectively, into a single functional component.
Solution Approach 2:
Different regions of the sparger are made from different materials optimized for their specific functions: the inner substrate tube uses thermally conductive non-combustible material for fire safety and thermal management, while the outer corrosion resistant layer uses titanium or niobium for corrosion protection. This local differentiation of material properties allows each region to perform its specific function optimally.
3Ease of manufacture
If the corrosion resistant layer is made thin to reduce material cost, then manufacturing cost is reduced, but thermal conduction capability is worsened
Solution Approach 1:
The corrosion resistant layer is applied only to the outer surface of the substrate tube where corrosion protection is needed, rather than making the entire sparger from expensive corrosion resistant material. This localized application provides sufficient corrosion protection while minimizing material cost, and the thin layer maintains adequate thermal conduction capability since the primary thermal conduction path remains through the substrate tube.
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 composite sparger extends service life by preventing corrosion and combustion, allowing safe operation in enriched oxygen environments by maintaining the corrosion-resistant layer below its ignition temperature.
Implementation Method 1
The thermally conductive interlayer metal has thermal conductive properties sufficient to maintain the corrosion resistant layer below its ignition temperature
Data Source
AI summary
A composite sparger for use in elevated temperature and corrosive environments. The composite sparger is formed from a substrate tube with a thermally conductive interlayer on its surfaces exposed to the reactor environment. The thermally conductive interlayer is protected with a corrosion resistant layer. The corrosion resistant layer protects the interlayer from the corrosive environment of the reactor vessel and the interlayer material conducts heat away from the corrosion resistant layer to prevent combustion of the corrosion resistant layer. The interlayer material and corrosion resistant material may be selected so as to provide for sufficient thermal conduction to prevent combustion of the corrosion resistant material.