Powder Conveying via Hyperdense Fluidization to Prevent Segregation
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Solution Overview
Problem
Existing powder transport systems using potential fluidization face challenges such as suboptimal energy consumption, particle size segregation, and significant recycling of alumina, particularly over long distances, which affect the homogeneity of the particle size and density distribution during transport.
Innovation Solution
A process involving a closed device with a horizontal air chute, where the upper duct is filled with powder material and connected to a gas feeding system, with a fluidization pressure set to achieve a gas fluidization speed between 0.8 and 1.5 times the reference fluidization speed, ensuring optimal fluidization conditions that prevent segregation and maintain homogeneity, utilizing a network of air chutes with balancing columns to manage pressure and flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If high fluidization gas flow rate is used to transport powder material, then transport speed and productivity are improved, but particle size segregation and energy consumption increase
Solution Approach 1:
The invention changes the fluidization parameter from high flow rate to optimized flow rate within specific ranges (0.8-1.5 times reference fluidization speed), achieving energy-efficient transport while preventing segregation through controlled fluidization conditions
Solution Approach 2:
The invention applies partial fluidization rather than complete turbulent fluidization, using just sufficient gas flow to maintain hyperdense phase and prevent segregation, avoiding the excessive energy consumption of high-velocity transport
2Productivity
If high fluidization gas flow rate is used, then transport efficiency is improved, but particle size segregation occurs
Solution Approach 1:
The invention optimizes the fluidization gas flow rate parameter to specific ranges (0.8-1.5 times reference fluidization speed), which maintains stable hyperdense phase conditions that prevent particle segregation while ensuring efficient transport
Solution Approach 2:
The invention creates a controlled hyperdense phase environment that replicates the beneficial conditions of low-velocity transport while maintaining continuous flow, preserving particle size distribution homogeneity
3Loss of energy
If low fluidization gas flow rate is used, then energy consumption is reduced, but transport productivity decreases
Solution Approach 1:
The invention applies the minimum necessary fluidization (0.8-1.5 times reference speed) to achieve hyperdense phase transport, avoiding both excessive energy consumption and insufficient transport productivity
Solution Approach 2:
The invention optimizes the fluidization speed parameter to a specific range that balances energy efficiency with adequate transport capacity, achieving productive transport at low energy consumption
4Device complexity
If fluidization pressure is not optimized, then equipment simplicity is maintained, but material homogeneity and transport stability deteriorate
Solution Approach 1:
The invention specifies optimal fluidization pressure ranges (0.8-1.5 times reference pressure) that maintain material homogeneity and transport stability without requiring complex control systems
Solution Approach 2:
The invention uses pressure monitoring and control to maintain fluidization within optimal ranges, ensuring material homogeneity through feedback-based pressure regulation
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
This approach allows for efficient, high-throughput powder transport with low pressure loss and energy consumption, maintaining the initial particle size and density distribution, preventing segregation and achieving a piston-type flow that preserves the material's homogeneity over long distances.
Implementation Method 1
the lower duct is supplied with gas at a pressure that allows the potential fluidization of said powder material in said upper duct
Implementation Method 2
the powder material is maintained in a state known as a 'hyperdense phase'
Implementation Method 3
The height to which the column is filled balances the pressure prevailing in the upper duct
Data Source
AI summary
A process for transporting a powder material, in which a device is fitted between a supply zone and a zone to be supplied, the device including at least one substantially horizontal conveyor which includes a lower duct and an upper duct being separated by a porous wall, the upper duct provided with a balancing column. The upper duct is filled with powder material and the lower duct is supplied with gas at a pressure that allows the potential fluidization of the powder material in the upper duct. The minimal bubbling speed, which corresponds to the maximum void fraction, is determined and the fluidization pressure is set to a value such that the fluidization speed of the gas is between 0.8 and 1.5 times the minimal bubbling speed, preferably between 0.9 and 1.3 times the minimal bubbling speed.