Gas Atomizer Bubbling Fluidized Bed Cooling
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Solution Overview
Problem
Current gas atomization processes for producing metal powders, particularly steel powders for additive manufacturing, face challenges in rapid cooling and continuous production, leading to inefficiencies and incompatibility with large-scale production needs.
Innovation Solution
A gas atomizer design that utilizes a bubbling fluidized bed in the lower section of the chamber for rapid cooling of metal particles, combined with a continuous discharge system through an overflow, allowing for efficient cooling and uninterrupted atomization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the powder is cooled in the atomizer chamber until it reaches a safe temperature, then the powder can be contacted with air without oxidizing, but the cooling process is long and not compatible with large-scale production needs
Solution Approach 1:
The atomizer chamber is divided into two functional zones: an upper atomization zone where molten metal is atomized into droplets, and a lower cooling zone where gas injectors create a fluidized bed for rapid cooling. This spatial segmentation allows simultaneous atomization and cooling operations, resolving the contradiction between reliable cooling and production speed.
Solution Approach 2:
The cooling action is initiated immediately after atomization by injecting cooling gas from the bottom of the chamber to form a fluidized bed. This preliminary cooling action occurs while the atomization process continues above, preventing oxidation before the powder contacts air, while maintaining high production throughput.
2Reliability
If a batch process is used for atomization, then the powder can be cooled and collected, but the process is not compatible with producing large amounts of metal powders in continuous mode
Solution Approach 1:
The atomization process operates continuously with molten metal fed from the top and cooling gas injected from the bottom simultaneously. The fluidized bed continuously cools falling droplets, and cooled powder can be discharged continuously through the bottom, eliminating batch cycle interruptions while maintaining process control.
Solution Approach 2:
The chamber is segmented into continuous flow zones: molten metal enters continuously from the top, atomization occurs in the upper zone, cooling occurs in the lower fluidized bed zone, and cooled powder exits continuously from the bottom. This continuous flow segmentation enables large-scale production while maintaining reliable process control.
3Temperature
If the powder accumulates at the bottom of the chamber for cooling, then rapid cooling can be achieved through gas injection, but the chamber must be opened to collect the powder which interrupts atomization
Solution Approach 1:
The chamber is segmented vertically with the atomization zone in the upper portion and the cooling zone in the lower portion. This allows simultaneous operation: atomization continues uninterrupted in the upper zone while cooled powder is discharged through the bottom, eliminating the need to open the chamber and maintain continuous production.
Solution Approach 2:
The fluidized bed of cooled powder acts as an intermediary layer at the bottom of the chamber. It receives hot droplets from above, cools them rapidly through gas injection, and allows continuous discharge through the bottom without exposing the atomization zone to air or interrupting the atomization process above.
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
Enables rapid cooling of metal particles below their oxidation window, facilitating continuous production of metal powders without disrupting the atomization process, thus addressing the limitations of batch processes and enhancing scalability.
Implementation Method 1
cooling the metal particles in the lower section of the chamber by injecting gas from the bottom of the chamber so as to form a bubbling fluidized bed of metal particles
Implementation Method 2
cooling the metal particles in the lower section of the chamber by injecting gas from the bottom of the chamber
Data Source
AI summary
A process for manufacturing metal powders, including (i) feeding a chamber of a gas atomizer with molten metal, (ii) atomizing the molten metal by injection of gas so as to form metal particles, (iii) cooling the metal particles in the lower section of the chamber by injecting gas from the bottom of the chamber so as to form a bubbling fluidized bed of metal particles. The gas atomizer thereof is also provided.