Comminution Device with Counter-Rotating Rotors and Aerodynamic Vortex
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Solution Overview
Problem
Existing comminution processes are limited in achieving a high degree of fine particle production in a single pass, requiring additional grinding and classification stages, which increases investment and energy costs.
Innovation Solution
A comminution device and method that combines mechanical and aerodynamic comminution principles in a single system, utilizing counter-rotating rotors with closed-channel cross-sections and additional cavities for aerodynamic vortices, along with adjustable impact plates for enhanced particle disruption, allowing for simultaneous shredding and drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If only mechanical comminution by counter-rotating rotors is used, then the device structure is simple, but the degree of comminution is limited and additional grinding stages are required
Solution Approach 1:
The patent combines mechanical comminution (counter-rotating rotors with comminution elements) and aerodynamic comminution (vortex chamber with tangential inlet) into a single integrated device. The mechanical rotors first break down the material, then the aerodynamic vortex further comminutes the particles through high-speed collisions, achieving ultrafine particles in one pass without requiring multiple separate grinding stages
Solution Approach 2:
The comminution device performs multiple functions within a single system: mechanical breaking by rotors, aerodynamic comminution by vortex, and simultaneous drying of the material. This multi-functionality eliminates the need for separate classification and drying stages, reducing overall device complexity while achieving high degree of comminution
2Manufacturing precision
If multiple comminution and classification stages are used to achieve ultrafine particles, then the desired fine particle size is obtained, but investment costs and energy consumption increase
Solution Approach 1:
The patent merges mechanical and aerodynamic comminution processes into a single integrated system where material passes through both mechanisms in sequence. The mechanical rotors provide initial breaking while the aerodynamic vortex completes the ultrafine comminution, achieving the desired particle size in one continuous process without requiring multiple separate grinding and classification stages, thereby reducing energy consumption
3Manufacturing precision
If multiple comminution and classification stages are used to achieve ultrafine particles, then the desired fine particle size is obtained, but investment costs increase
Solution Approach 1:
The patent integrates mechanical comminution (rotors with comminution elements) and aerodynamic comminution (vortex chamber with tangential inlet) into a single device. The mechanical stage breaks down material while the aerodynamic vortex further comminutes particles through high-speed collisions, achieving ultrafine particles in one pass without requiring multiple separate grinding and classification stages, thus reducing the number of comminution stages and investment costs
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 high-efficiency comminution of materials to fine particle sizes in a single pass, reducing the number of required comminution stages and energy consumption, while allowing for material drying if necessary.
Implementation Method 1
Within the channels, the material streams are subjected to a centrifugal force, and the more or less coarse or fine particles of the material stream, as they move towards the periphery of the rotors, encounter comminution elements
Implementation Method 2
multiple collisions between the particles in the subsequent aerodynamic vortices that arise in cavities (blind holes, dead holes) provided in the edge zone of the rotors in the outermost ring area of the rotors
Implementation Method 3
This creates an aerodynamic disturbance when the particles collide at high frequency, altering particle type, size, and impact force
Implementation Method 4
the state energy (potential energy) of the elastic deformation of the particles (solid fracture mechanics) is converted into heat energy during comminution (particle fracture) within the housing of the comminution device
Data Source
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AI summary
The invention relates to the field of fine comminution of solid materials, which can be of different types and exhibit different strength properties. In a new comminution device, a mechanical comminution process is combined with a generally directly subsequent aerodynamic process. In this process, a material to be ground, in the form of a gas-solid suspension, is divided into streams that are guided in circumferentially closed channels between comminution elements on counter-rotating rotors against the ring-shaped rotating comminution elements of a counter-rotating rotor. This aerodynamic process involves inducing a collision of the material streams from the channels in an annular gap between the rotors, creating turbulence.The comminution preferably takes place before the product is discharged, additionally in an outer ring area between the edge of the rotors and the housing wall, in which additional impact plates are arranged.