Digestion Corridor Geometry for Dry Methanation Flow
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Solution Overview
Problem
Existing methanization installations face inefficiencies in the movement of organic matter between the inlet and outlet, particularly in 'dry' methanization processes where the organic material has mixed solid and liquid properties, making it difficult to pump and resulting in suboptimal digestion results.
Innovation Solution
The installation features a digestion corridor with an introduction zone of continuously increasing width and an evacuation zone of decreasing width, along with specific wall angles and a pusher system to facilitate the movement of organic matter, including a pusher that moves along a vertical stroke and a deflection portion for horizontal introduction, and an evacuation pump for efficient extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a linear digestion corridor is used for dry methanization, then the installation can process organic matter with mixed solid and liquid properties, but the movement of organic matter between inlet and outlet is suboptimal
Solution Approach 1:
The digestion corridor transitions from a uniform linear structure to a dynamic structure with variable cross-sectional area. The introduction zone has increasing width to accommodate and distribute organic matter, while the evacuation zone has decreasing width to concentrate and direct flow toward the outlet. This dynamic geometric variation optimizes material movement throughout the digestion process.
Solution Approach 2:
Different zones of the digestion corridor are given different geometric properties tailored to their specific functions. The introduction zone features expanding geometry for material distribution, the main zone maintains cylindrical shape for stable digestion, and the evacuation zone features contracting geometry for efficient material removal. Each zone's local geometry is optimized for its specific operational requirement.
2Ease of manufacture
If the digestion corridor has uniform cross-section, then construction is simpler, but organic matter circulation and flow rates are reduced
Solution Approach 1:
The corridor geometry transitions from static uniform cross-section to dynamic variable cross-section. The introduction zone expands from a smaller inlet area to a larger main zone area, while the evacuation zone contracts from the main zone to a smaller outlet area. This dynamic geometric progression enhances material circulation velocity and residence time distribution, directly improving biogas production rates.
3Ease of manufacture
If wall angles are not optimized, then construction is easier, but organic matter flow and digestion efficiency decrease
Solution Approach 1:
The wall angles are optimized to specific ranges (30-60 degrees for introduction zone walls, 40-50 degrees for evacuation zone walls) to balance material flow promotion with construction feasibility. These parameter optimizations create appropriate shear stresses and flow patterns that enhance organic matter circulation and digestion efficiency while remaining constructible with standard techniques.
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 design enhances the circulation and processing of organic matter, improving flow rates and digestion efficiency, allowing for the production of 1000 to 3000 cubic meters of biogas per day with optimized organic matter movement and digestion.
Implementation Method 1
The organic matter has physical properties of a solid at its center and physical properties of a liquid at its periphery. It is thus possible to cause a linear movement of said organic matter
Implementation Method 2
Through a process of fermentation, or digestion, this organic matter produces biogas, or digestion gas, and a solid residue, or digestate
Implementation Method 3
Methanization makes it possible to recover organic matter from agriculture, such as slurry or manure. Through a process of fermentation, or digestion, this organic matter produces biogas
Data Source
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AI summary
The present invention relates to a methanation plant (10), comprising: a digestion corridor (12), suitable for receiving organic matter, - a gas collector (14), surmounting the digestion corridor; and - an introduction device (16) and an evacuation device (18) of organic matter, disposed at the ends of the digestion corridor; the digestion corridor comprising a substantially cylindrical surface extending in the longitudinal direction; the plant being characterized in that the digestion corridor further comprises: an introduction zone (32), having a continuously increasing width; and an evacuation zone (34), having a continuously decreasing width.