Screening Device With Fluidized Bed For Particulate Separation
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Solution Overview
Problem
Existing screening devices for solid particulate materials are inefficient and may provide inaccurate separation of particulate size-dependent fractions, leading to suboptimal processing and energy consumption.
Innovation Solution
A screening device comprising a perforated wall and a gas permeable layer for fluidization, allowing simultaneous screening and transport of particulate material into at least two size-dependent fractions, with the perforated wall preventing larger particles from passing through and the gas permeable layer enabling fluidization for efficient separation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional screening devices are used to separate particulate materials, then separation of size-dependent fractions is achieved, but screening efficiency is low and accuracy is poor
Solution Approach 1:
The patent applies pneumatic principles by using a fluidized bed chamber where gas flow fluidizes the particulate material, enabling particles to be suspended and separated based on size. This pneumatic approach replaces conventional mechanical screening with a fluid-based separation mechanism, achieving both high efficiency and accuracy simultaneously
Solution Approach 2:
The patent changes the physical state parameter of the particulate material from solid stationary state to fluidized suspended state by controlling gas flow rate. This parameter change enables particles to behave differently during separation, improving both screening accuracy and efficiency by allowing fine particles to pass through while coarse particles are carried away
2Device complexity
If screening is performed using traditional methods, then particle separation is achieved, but additional transport equipment is required increasing device complexity
Solution Approach 1:
The patent merges the screening function and transport function into a single integrated device. The fluidized bed chamber simultaneously performs particle separation and material transport, eliminating the need for separate conveyor equipment. This combination reduces device complexity while maintaining high productivity
Solution Approach 2:
The screening device is designed with multi-functionality, serving both as a separation chamber and a transport system. The same fluidized bed mechanism that separates particles by size also transports both fine and coarse fractions to their respective outlets, making the device universal and reducing overall system complexity
3Use of energy by moving object
If conventional screening is used to separate particulates, then size-based separation is achieved, but energy consumption is high
Solution Approach 1:
The patent uses pneumatic fluidization instead of high-energy mechanical vibration or moving screens. The gas flow required to fluidize the bed consumes less energy while providing continuous separation action, achieving both low energy consumption and high separation accuracy simultaneously
Solution Approach 2:
The fluidized bed screening operates continuously with constant gas flow maintaining the fluidized state. This continuous action eliminates the need for intermittent mechanical movements, reducing peak energy demands while maintaining consistent separation accuracy throughout 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
The solution enables efficient screening and transport of particulate materials with minimal energy input, reducing the formation of fines dust and ensuring accurate separation of size-dependent fractions, improving the overall efficiency and accuracy of the screening process.
Implementation Method 1
a gas permeable layer for fluidization of particulates to simultaneously transport particulates through said screening device along said perforated wall and screen particulates within said screening device
Data Source
AI summary
A screening device (1) comprises a first compartment (3) for receiving solid particulate material, a second compartment (5) for receiving screened particulates from said first compartment (3), a perforated wall (7) separating the first (3) and second (5) compartments from each other for screening the solid particulate material into at least two particulate size-dependent fractions, and a gas permeable layer (21) for fluidization of particulates in said first compartment (3). The first compartment (3) is provided with a solid particulate material inlet (9) located at a first end (22) of screening device (1), and a particulate material outlet (11) located at a second end (24) of screening device (1), with perforated wall (7) extending from first end (22) to second end (24) of screening device (1), enabling simultaneous transport and screening of at least a portion of said solid particulate material.