Annular Gas Volume Segmentation for Polymer Drying
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Solution Overview
Problem
Existing methods for processing incoherent hygroscopic materials, such as plastics, face issues with pressure drops in gas flow, non-uniform thermal energy transfer, risk of localized overheating, and inefficiencies in drying and dehumidification processes, leading to energy consumption and material damage.
Innovation Solution
The apparatus features a container with a gas volume divided into multiple annular portions separated by gas-permeable interfaces, allowing for a controlled process gas flow that reduces pressure drops and ensures uniform thermal energy distribution, minimizing the risk of overheating and improving material processing efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single gas volume is used for processing incoherent material, then the structure is simple, but the thermal energy transfer is non-uniform and pressure drops are high
Solution Approach 1:
The gas volume is divided into multiple annular portions (first, second, third, fourth annular portions) separated by gas-permeable interfaces. This segmentation allows independent control of process gas flow in each zone, enabling uniform thermal energy distribution across the material while maintaining a relatively simple overall structure.
Solution Approach 2:
Each annular portion can have different gas flow characteristics and thermal conditions optimized for its specific location. The gas-permeable interfaces allow localized adjustment of gas flow rates and temperatures, ensuring that thermal energy is distributed uniformly throughout the material without requiring a complex overall structure.
2Productivity
If process gas flows directly through material mass, then heating is efficient, but localized overheating occurs and material is damaged
Solution Approach 1:
The process gas flow path is segmented into multiple annular portions with gas-permeable interfaces between them. This segmentation distributes the gas flow across multiple zones, preventing concentration of thermal energy in any single location and thereby eliminating localized overheating while maintaining overall heating efficiency.
Solution Approach 2:
The temperature, pressure, and flow rate parameters of the process gas can be independently adjusted in each annular portion. By optimizing these parameters in each zone, uniform heating is achieved without exceeding material tolerance thresholds, preventing localized overheating damage.
3Productivity
If process gas flow rate is increased to improve drying efficiency, then energy consumption increases and pressure drops increase
Solution Approach 1:
The gas flow is divided into multiple annular portions that can be independently controlled. This allows the total gas flow rate to be distributed across multiple lower-velocity streams, reducing pressure drops and energy consumption while maintaining effective drying through increased gas-material contact area and improved flow distribution.
4Manufacturing precision
If gas-permeable interfaces are added to create multiple gas portions, then thermal energy transfer becomes uniform, but device complexity increases
Solution Approach 1:
Gas-permeable interfaces (which may be membranes or porous structures) are used to separate the annular gas portions. These thin, flexible structures achieve the required gas flow control and thermal energy distribution uniformity while adding minimal structural complexity to the overall device.
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 solution reduces energy consumption, achieves uniform temperature and humidity conditions for all processed particles, and prevents material damage by ensuring consistent thermal energy transfer and homogeneous gas distribution within the container.
Implementation Method 1
each portion of the gas volume is separated from the material volume by respective gas-permeable gas-material interfaces
Implementation Method 2
the incoherent material (polymer granule or pellet) is introduced into a container (drying and/or dehumidification hopper) and is passed through (in countercurrent) by a process gas (heated air), sufficiently dry, which absorbs excess humidity
Implementation Method 3
a controlled process gas flow that reduces pressure drops and ensures uniform thermal energy distribution
Data Source
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AI summary
An apparatus and method are disclosed for processing incoherent material with a process gas, particularly for heating and extracting moisture from polymer granules with hot air, with a container including a material volume for containing the incoherent material and a gas volume traversable by the process gas and which includes various portions separated from each other, i.e. a central inner portion, a lower outer annular-shaped portion, an upper outer annular-shaped portion and an intermediate annular-shaped portion, wherein each portion is separated from the material volume via gas-permeable gas-material interfaces, and wherein a maximum section width of the intermediate portion is greater than an average section width of the lower outer portion and/or greater than an average section width of the upper outer portion, in order to reduce pressure drops in the process gas flow.