Biogas Fermenter Injection Device for Floating Layer Management
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Solution Overview
Problem
Biogas plant fermenter tanks face challenges with floating or cover layers that impede biogas separation and extraction, requiring high energy to break and mix these layers, which reduces efficiency, especially in large tanks.
Innovation Solution
A biogas plant fermenter tank system incorporating a stirring device and an injection device, where the injection device uses a liquid jet to wet the floating layers, allowing them to participate in fermentation without being stirred into the substrate, while the stirring device homogenizes the substrate below the floating layer with reduced energy consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If stirring devices are used to break and mix floating layers into the substrate, then complete homogenization is achieved, but energy consumption increases significantly
Solution Approach 1:
The invention extracts the floating layer from the mixing process by applying liquid jet onto the surface to wet the floating layer, allowing it to participate in fermentation without being mechanically stirred into the substrate. This separates the function of homogenizing the liquid substrate from breaking up the floating layer, reducing energy consumption while maintaining complete mixing of the substrate below the floating layer.
Solution Approach 2:
The invention introduces liquid jet as an intermediary medium to interact with the floating layer. Instead of using mechanical stirring devices to directly break and mix the floating layer, liquid jet is applied onto the surface to wet the floating layer, enabling it to participate in fermentation processes without requiring high energy input for mechanical breakdown.
2Length of moving object
If stirring devices are extended very far upwardly to reach the surface of the substrate, then floating layers can be stirred, but the efficiency of through mixing deteriorates
Solution Approach 1:
The invention removes the floating layer from the mechanical stirring zone by applying liquid jet onto the surface. This allows the stirring device to operate effectively at lower heights, focusing on homogenizing the liquid substrate below the floating layer without the negative impact of extending stirring devices far upwardly, thereby maintaining high mixing efficiency.
Solution Approach 2:
The invention transitions from vertical mechanical stirring (one-dimensional approach) to surface liquid jet application (another dimension). Instead of extending stirring devices vertically to reach the floating layer, liquid jet is applied onto the surface from above, wetting the floating layer and enabling it to participate in fermentation without compromising the mixing efficiency of the substrate below.
3Reliability
If liquid substrate is injected onto the floating layer surface to keep it moist, then the floating layer can participate in fermentation, but complete homogenization of the substrate is not achieved
Solution Approach 1:
The invention combines two functions into a unified system: the injection device applies liquid jet onto the floating layer surface to wet it and enable fermentation participation, while the stirring device simultaneously homogenizes the liquid substrate below the floating layer. This integrated approach ensures both fermentation process continuity and complete homogenization of the substrate, resolving the contradiction between maintaining floating layer moisture and achieving thorough mixing.
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 achieves a high biogas yield with reduced energy expenditure by ensuring complete homogenization of the substrate and incorporating floating layers into the fermentation process, enhancing overall efficiency and productivity.
Implementation Method 1
an injection device (9) is provided which has at least one delivery pump (10) by means of which injection liquid can be drawn in or extracted
Implementation Method 2
injected into the fermenter tank (1) in such a way that, relative to a direction of the vertical axis of the fermenter tank, it impinges as a liquid jet (13) from above onto the surface of a floating layer (7) of the substrate (6) and wets the latter
Implementation Method 3
at least one stirring device (8), preferably a plurality of stirring devices spaced apart from one another, is arranged in the tank inner chamber (5) in such a way that, by means of this, the substrate (6) in the region below the floating layer (7) can be substantially completely homogenized and/or mixed
Implementation Method 4
a biogas plant fermenter tank (1), in particular a biogas plant fermenter tank of a biogas plant having one or more fermenter tanks, is proposed and has a substantially liquid substrate (6) accommodated in the tank inner chamber (5)
Data Source
AI summary
The invention relates to a biogas plant fermenter tank (1) comprising a substantially liquid substrate (6) accommodated in the tank inner chamber (5) and at least one stirring device (8) arranged in the tank inner chamber (5). According to the invention, an injection device (9) having at least one delivery pump (10) which extracts the injection liquid (12), and at least one injection nozzle element (11) which is fluidically connected to the at least one delivery pump (10), is provided. The injection liquid (12) can be injected into the fermenter tank (1) by means of said injection device in such a way that the injection liquid impinges as a liquid jet (13) from above onto the surface of a floating layer (7) of the substrate (6) and wets the latter.