Rotatable Fluidization Compartment for Geldart C Particle Suspension
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Solution Overview
Problem
Existing fluidized bed technologies face challenges in handling small particles, particularly Geldart C particles, due to insufficient drag force to counteract gravity, leading to poor fluidization and rapid size reduction of catalysts, resulting in short particle life and high waste production.
Innovation Solution
A rotatable fluidization compartment with a circumferential wall and a fluid distributor that imparts centrifugal acceleration mechanically, reducing the need for high gas flow rates and allowing for controlled rotational speed to maintain particle suspension and extend residence time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional fluidized bed technology is used with small particles, then particle suspension is attempted, but defluidization occurs due to insufficient drag force
Solution Approach 1:
The fluidization compartment is made rotatable around the central axis, transforming the static fluidized bed system into a dynamic one. The rotation generates centrifugal acceleration that acts on the particles, providing an additional force mechanism beyond conventional gas drag to maintain particle suspension and prevent defluidization.
Solution Approach 2:
The system changes the physical parameters acting on particles by introducing rotational motion. The centrifugal acceleration parameter (a function of rotational speed and radius) is adjusted to compensate for the insufficient drag force on small particles, thereby improving fluidization stability without requiring excessive gas flow rates.
2Reliability
If high gas flow rates are used to fluidize small particles, then particle suspension is achieved, but particle size reduction accelerates due to intense collisions
Solution Approach 1:
The patent replaces part of the gas flow mechanism with a mechanical rotation system. Instead of relying solely on high gas flow rates to suspend particles, the rotational motion of the compartment generates centrifugal forces that contribute to particle suspension, thereby reducing the need for high gas velocities and the associated intense particle collisions that lead to attrition.
Solution Approach 2:
The centrifugal acceleration generated by rotation acts as a counterbalancing force to gravity, helping to suspend particles without requiring excessive gas flow. This reduces the intensity of particle collisions and extends particle lifetime by mitigating the harsh conditions that cause rapid size reduction.
3Stability of the object's composition
If swirling motion is imparted to fluidize small particles, then particle mixing is improved, but high volume flow of fluid is required
Solution Approach 1:
The patent replaces the need for high volume fluid flow with a mechanical rotation system. The rotational motion of the fluidization compartment itself generates the swirling motion and centrifugal acceleration, eliminating the requirement for high gas or liquid flow rates to achieve particle mixing and suspension.
Solution Approach 2:
The fluidization compartment's rotation serves dual purposes: it both mixes the particles and generates the centrifugal acceleration needed for suspension. The system uses its own structural motion to achieve the fluidization effect, rather than requiring a separate high-flow fluid system to provide the mixing and suspension functions.
4Reliability
If tangential fluid velocity is used to create swirling motion, then particle suspension is achieved, but the swirling component extinguishes rapidly with height
Solution Approach 1:
By making the entire fluidization compartment rotate rather than relying on tangential fluid injection, the system creates a dynamic environment where centrifugal acceleration is continuously generated throughout the particle bed. This rotational mechanism maintains swirling motion throughout the entire height of the compartment, preventing the rapid extinction of swirl that occurs in conventional systems.
Solution Approach 2:
The rotational motion is applied to the entire compartment structure before particles are introduced, establishing a persistent centrifugal field that maintains swirling motion throughout the bed height. This preliminary establishment of rotational dynamics ensures that swirl is maintained from bottom to top, rather than being generated locally and extinguishing rapidly.
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 apparatus effectively fluidizes small particles, increasing their residence time and preventing premature defluidization, thereby enhancing the life of catalysts and reducing waste production.
Implementation Method 1
A rotatable fluidization compartment with a circumferential wall and a fluid distributor that imparts centrifugal acceleration mechanically
Implementation Method 2
the bottom side comprises a first fluid distributor for distributing a first fluid into the fluidization compartment
Implementation Method 3
imparts centrifugal acceleration mechanically, reducing the need for high gas flow rates
Data Source
AI summary
The present disclosure relates to an apparatus for generating a fluidized bed comprising solid particles mixed with a fluid. The apparatus comprises a fluidization compartment wherein a bottom side comprises a fluid distributor for distributing a fluid into the fluidization compartment and wherein an upper side comprises an opening. The apparatus further comprises a fluid supply compartment configured for supplying the fluid to be distributed by the fluid distributor, and a disengagement compartment comprising a bottom side having an opening matching or at least partly matching with the opening of the upper side of the fluidization compartment such that fluid can flow from the fluidization compartment to the disengagement compartment. The apparatus is characterized in that the fluidization compartment is rotatably mounted with respect to the fluidization compartment and with respect to the disengagement compartment such that the fluidization compartment is rotatable around a central axis while the fluid supply compartment and the