Static Mixer for Enzyme Powder Blending
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Solution Overview
Problem
Current methods for mixing small amounts of enzyme particles into larger amounts of powder, such as in detergent production, are inefficient and costly due to the use of large rotary drum mixers, and static mixers are not effectively applied for dry powder mixing due to understanding gaps and potential damage to sensitive particles.
Innovation Solution
Continuous mixing in a static mixer with a weight ratio below 1:20 of enzyme particles to powder, achieving high homogeneity and low enzyme dust levels without damaging the enzyme particles, using a static mixer with no moving components and specific design features.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If rotary drum mixers are used to mix enzyme particles into powder detergents, then mixing efficiency is improved, but equipment size and cost increase substantially
Solution Approach 1:
The patent replaces the mechanical rotating drum mixer with a static mixer that uses fluid dynamic forces generated by the powder flow itself to achieve mixing. The static mixer contains stationary elements that create controlled turbulence and particle redistribution without mechanical moving parts, thereby eliminating the need for large, expensive rotary equipment while maintaining mixing efficiency.
Solution Approach 2:
The invention utilizes the pneumatic flow characteristics of the powder stream to achieve mixing. By designing the static mixer elements to interact with the flowing powder, the system converts the kinetic energy of the powder flow into mixing action, replacing mechanical drive systems with fluid dynamic-based mixing.
2Device complexity
If static mixers are used for powder mixing, then equipment size and cost are reduced, but mixing quality deteriorates due to lack of understanding of powder flows
Solution Approach 1:
The patent optimizes critical parameters of the static mixer including element geometry, spacing, and arrangement to achieve effective powder mixing. By carefully controlling parameters such as element angle, diameter, and positioning, the design compensates for the lack of theoretical understanding and achieves reliable mixing quality despite using simpler equipment.
Solution Approach 2:
The static mixer elements are designed to operate in multiple dimensions simultaneously, creating three-dimensional particle redistribution patterns within the powder flow. This multi-dimensional mixing approach overcomes the limitations of simple linear mixing and achieves homogeneous blends using compact stationary elements.
3Productivity
If static mixers with sharp mixing elements are used, then mixing action is enhanced, but particle damage increases
Solution Approach 1:
The patent applies different surface qualities to different parts of the mixing elements. The elements are designed with rounded edges and smooth surfaces in contact zones to prevent particle damage, while maintaining geometric features that generate effective mixing action. This local optimization allows aggressive mixing where needed while protecting particles where contact occurs.
Solution Approach 2:
The static mixer elements are designed to induce controlled vibrations and fluctuations in the powder flow as they pass through the mixing section. This vibrational mixing mechanism reduces the need for direct mechanical contact between particles and mixing elements, thereby minimizing particle damage while maintaining effective mixing action.
Data Source
AI summary
Continuous mixing in a static mixer possible can be used to add one kind of particles (such as an enzyme granular product) in a small amount to a larger amount of a different kind of particles (such as a powder stream of detergent powder), even if the powder characteristics are substantially different, with substantially no damage to the enzyme particles and with a high degree of homogeneity.