Particle Processing With Pulsating Gas-Solid Fluidized Beds
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fluidized beds face challenges in uniform fluidization, mixing, and scalability due to complex hydrodynamics and unpredictable bubble dynamics, leading to instability and difficulty in scale-up and control.
Innovation Solution
A method involving pulsating gas flow to create a dynamically structured bubble flow with a spatially periodic pattern, controlled by adjusting gas flow parameters, forming compartmentalized mixing compartments with axial and inter-compartment mixing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If conventional fluidization is used, then gas-solid contact is achieved, but mixing is insufficient and hydrodynamics are unstable
Solution Approach 1:
The patent applies periodic gas flow pulsation to the fluidized bed, where the gas flow rate is oscillated at a specific frequency. This periodic action transforms the chaotic, unstable bubble dynamics into a regular, predictable pattern of bubble formation and coalescence, stabilizing the hydrodynamics while maintaining effective gas-solid contact and mixing.
2Productivity
If bubble size is increased to improve mixing, then mixing efficiency increases, but gas bypasses solids reducing contact time
Solution Approach 1:
The patent dynamically controls bubble size through periodic gas flow pulsation. By oscillating the gas flow rate, the system can regulate the formation, growth, and coalescence of bubbles in real-time. This allows optimization of bubble size to achieve effective mixing while preventing excessive bubble growth that would cause gas bypass and reduce contact time.
3Stability of the object's composition
If gas flow rate is increased to improve fluidization, then mixing improves, but energy consumption increases
Solution Approach 1:
Instead of maintaining a constantly high gas flow rate, the patent uses periodic pulsation where the gas flow is oscillated between higher and lower values. This allows the bed to achieve good fluidization and mixing during the high-flow phases while consuming less energy during the low-flow phases, reducing overall energy consumption compared to continuous high-flow operation.
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
Achieves effective mixing at low gas flow rates, compartmentalized flow, scalability, and responsiveness by controlling bubble size and spacing, reducing uncertainties in design and operation.
Implementation Method 1
flowing a pulsating gas flow upwards through a bed of solid particles from a distributor to cause a dynamically structured bubble flow
Implementation Method 2
cause a dynamically structured bubble flow with a spatially periodic pattern
Data Source
AI summary
A method of operating a gas-solid fluidized bed (130) includes-flowing a pulsating gas flow upwards through a bed of solid particles from a distributor (104) to cause a dynamically structured bubble flow (130), and processing particles using the fluidized bed.