Perforated Base Inclination for Uniform Biomass Drying
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Solution Overview
Problem
Existing methods for drying free-flowing fuels from renewable raw materials face challenges such as volume loss and uneven drying, leading to sliding biomass and the need for frequent mixing and rearrangement, which complicates the drying process and requires complex construction designs.
Innovation Solution
A perforated base with an inclination 5 to 20° less than the angle of repose of the undried fuel, combined with ventilation slots covered by bulges to prevent biomass blockage and improve airflow, ensures uniform drying without separate mixing or rearrangement, and includes a flow channel for enhanced aeration.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the perforated base has an inclination corresponding to the angle of repose of the fuel, then the thickness of the deposited fuel is uniform over the bottom surface, but the drying biomass slides towards the ground causing uneven thickness and requiring frequent mixing and rearrangement
Solution Approach 1:
The inclination angle of the perforated base is changed from the angle of repose to a lower value (5-20° less than the angle of repose). This parameter change prevents biomass from sliding while maintaining sufficient airflow for drying, eliminating the need for frequent mixing and rearrangement operations.
Solution Approach 2:
The system transitions from a static inclination angle equal to the angle of repose (causing sliding) to a dynamic optimization where the angle is slightly reduced to prevent sliding while maintaining drying efficiency. This creates a stable configuration that doesn't require active intervention.
2Reliability
If the inclination of the perforated bottom is reduced to prevent biomass sliding, then uniform drying is achieved, but the flow resistance for drying air becomes non-uniform
Solution Approach 1:
The bulges are strategically placed at specific locations on the perforated base to create local modifications in airflow patterns. These localized structures compensate for the non-uniform flow resistance caused by the reduced inclination angle, ensuring uniform drying across the entire biomass layer.
Solution Approach 2:
The bulges act as intermediary elements between the reduced inclination angle and the airflow. They modify the local flow characteristics to compensate for the overall non-uniformity, serving as a mediator that reconciles the geometric change with uniform drying requirements.
3Productivity
If ventilation slots are provided on the perforated base for airflow, then drying efficiency is improved, but biomass blocks the slots reducing airflow
Solution Approach 1:
The bulges are pre-formed on the perforated base to protrude into the ventilation slots before biomass is placed. This preliminary action creates a physical barrier that prevents biomass from blocking the slots, ensuring consistent airflow throughout the drying process.
Solution Approach 2:
The bulges create a preliminary anti-action by protruding into the ventilation slots to prevent biomass from entering and blocking them. This anticipatory measure counteracts the potential harmful effect of slot blockage before it can occur.
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 configuration standardizes flow resistance and thickness, allowing for faster and more uniform drying of biomass, eliminating the need for frequent mixing and reducing construction complexity, while preventing biomass from blocking air outlets.
Implementation Method 1
the perforated base has an inclination dependent on the angle of repose of the free-flowing fuel
Implementation Method 2
the ventilation slots being covered by bulges which are bent out of the plane of the plate and protrude towards the drying chamber and at least partially cover the ventilation slots
Implementation Method 3
at least one distribution chamber provided below the perforated base for preferably heated drying air
Implementation Method 4
The fuel bed resting on the perforated base is supplied with drying air via these chambers
Data Source
Figure 1
Figure 2~3
AI summary
The device has a hole bottom part (2) for receiving free-flowing fuel (1), and a dispatcher chamber (3) provided below the hole bottom part for heated drying air. The hole bottom part has a slant (alpha) around 5-20 degrees preferably 8-15 degrees dependant from a repose angle (beta) of the free-flowing fuel. The hole bottom part rises from a passable substrate (5) against a wall (6) of a drying space (7). The dispatcher chamber between the substrate and the wall is separated from remaining drying spaces. The slant of the hole bottom part is smaller than repose angle of the free-flowing fuel.