Solid State Welded Corrosion Resistant Fluid Parts
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Solution Overview
Problem
Current materials used in urea synthesis equipment, such as stainless steel and titanium, face significant corrosion and erosion issues due to harsh conditions, leading to equipment failure and high maintenance costs, particularly in regions with sudden fluid direction changes or evaporation, where existing bonding methods like mechanical bonding between dissimilar metals like zirconium and stainless steel fail to provide adequate corrosion resistance.
Innovation Solution
The development of corrosion-resistant fluid conducting parts using solid state welding techniques, where a corrosion-resistant material like zirconium or titanium is joined to a compatible material like titanium or stainless steel using methods like inertia welding or explosive bonding, avoiding the formation of alloys that can corrode, and ensuring a strong, durable bond without compromising mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If stainless steel or titanium materials are used in urea synthesis equipment, then the equipment can operate under high pressure and temperature conditions, but the materials experience significant corrosion and erosion leading to equipment failure
Solution Approach 1:
The patent applies composite materials by creating a multi-layer tube structure where a corrosion-resistant inner layer (such as zirconium or zirconium alloy) is solid state welded to a mechanically compatible outer layer (such as titanium or stainless steel). This composite structure allows the equipment to withstand high temperature and pressure while the inner corrosion-resistant layer protects against corrosive urea solutions, thereby resolving the contradiction between operating temperature capability and corrosion resistance.
Solution Approach 2:
The patent implements local quality by applying different material properties to different regions of the tube. The inner layer in direct contact with the corrosive urea solution is made of highly corrosion-resistant material (zirconium), while the outer layer is made of mechanically strong material (titanium or stainless steel) that provides structural integrity. This localized material assignment optimizes both corrosion resistance and mechanical performance under high temperature and pressure.
2Strength
If fusion welding is used to join dissimilar materials, then the materials can be joined together, but alloys are formed that enhance corrosion rates
Solution Approach 1:
The patent replaces the fusion welding process (which creates alloys through melting and mixing) with solid state welding processes such as diffusion welding, friction welding, or explosion welding. These mechanical/physical joining methods bond the inner and outer layers without melting the materials, thereby avoiding the formation of corrosive alloys while still achieving strong joint strength. This substitution resolves the contradiction between joint strength and corrosion resistance.
3Reliability
If titanium stripper tubes are used, then corrosion resistance is improved, but erosion and corrosion occur in regions with sudden changes in fluid direction
Solution Approach 1:
The patent uses composite materials with the inner layer made of highly erosion and corrosion-resistant material (such as zirconium) that can withstand the harmful effects in regions with sudden fluid direction changes. The outer layer provides mechanical strength and structural integrity. This composite structure simultaneously improves both corrosion resistance and erosion resistance, resolving the contradiction between these two properties.
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 approach significantly enhances the service life of equipment by preventing corrosion and erosion, reducing maintenance costs, and allowing for the retrofitting of existing units with corrosion-resistant parts without creating conditions that promote further corrosion, thus improving the reliability and longevity of urea synthesis equipment.
Implementation Method 1
The inner layer and the outer layer are one of directly and indirectly joined by solid state welding so as to form a unitary fluid conducting part
Data Source
AI summary
According to one aspect of the present disclosure, a part for an article of equipment includes a fluid conducting first region including a corrosion resistant first material, and a fluid conducting second region including a second material. The first region and the second region are either directly or indirectly joined by solid state welding to form a unitary fluid conducting part. According to another aspect of the present disclosure, a method for replacing at least one fluid conducting part of an article of equipment is disclosed wherein a replacement part is provided that includes a fluid conducting first region including a corrosion resistant first material, and a fluid conducting second region including a second material. The second material is substantially identical to the material of a region of the equipment on which the replacement part is mounted. The first and second regions are either directly or indirectly joined by solid state welding to form a unitary fluid conducting replacement part. The replacement part is secured to the article of equipment by a process comprising fusion welding the second material of the second region of the replacement part to the substantially identical material of the mounting region of the article of equipment.