DE10042976A1 - Enclosed fermentation vessel for agricultural wastes includes de-sulfurization biofilter, internal floating base and vertical service columns - Google Patents

Abstract

A fermentation vessel for agricultural wastes, is new. A fermentation vessel is surrounded by heating pipes in insulation. An intermediate perforated cover separates gas- and fermentation chambers. Below the cover, a biofilter de-sulfurizes gas produced. In the dry composting fermenter, the substrate lies above the floating base. Substrate and residues can be supplied to the lower storage section via the floating base. Flotation promotes self-cleaning. A separator divides solids from the substrate suspension, improving flowability and handling of the latter. Solids are recycled to the process, accelerating composting. Vertical service columns are employed. Like pipes, they remove gas and supply animal waste for spraying onto fresh substrate. A pressure line supplies the substrate. A suction line removes liquid waste to the separator. A suction line of the cleaning screw is flange-connected directly from the exterior.

Description

Known technology

Corn and grass silage and other renewable raw materials are crushed and diluted to the fermenter via a pump. Moving floors, roll-off containers and Lattice box processes are very labor-intensive and therefore uneconomical.

Novelty the dry rotting plant

Batch-wise in a mechanical mixer (feed mixer wagon with Augers) maize and grass silage and other renewable raw materials and enriched with bacteria-rich solids from the separator and into a homogeneous Mass processed. The substrate heats up.

The supply of the co-substrates is the processing capacity of the biogas plant coordinate accordingly. This mass is the via a pressure pipe Dry rotting fermenter fed and there in the upper part of the fermenter substrate pushed.

To accelerate rotting, the substrate can be made with fresh manure or with thin manure be sprayed onto the separator.

In the dry rot fermenter, the substrate lies over a floating pontoon floor where it is is fermented.

With the pontongs, the substrate can with different fermentation times and all Residual materials are fed to the lower store.

Pontongs or other floating bodies are used for one movement and therefore one. To achieve self-cleaning.

In order to maintain the flowability and conveyability of the substrate suspension, the Solids fraction separated out via a separator and the process for accelerating the Rotting process fed again.

As process water, cloudy water is arranged from that after fermentation Separation stage recirculated or fresh manure fed directly.

After this dry fermentation, the thin substrate is added in batches Liquid manure buffer or directly introduced into the wet fermenter or hygienizer.

The biogas produced is collected in the upper part of the dry rot fermenter Pressure is created that pushes the thin liquid from the lower part into the service column. When the gas overflows, the liquid flows back and the bottom of the Dry rotting fermenter is rinsed.

Solids are discharged through a bottom screw  

technical description container

The container can be made from the usual materials. He is with the outside Surround heating cables which are integrated in insulation.

There is a false ceiling in the container, which contains the gas space and the fermenter space separate.

A biofilter for desulfurization of the methane gas is installed in the gas space under the ceiling. There is a manhole in the dome as an assembly opening;

service column

All supply and withdrawal lines are routed through the service pillar.

• - Gas extraction line
• - Manure line for rinsing and spraying the new substrate
• - Pressure line for feeding the substrate
• - Manure suction line for separator

The suction line of the cleaning screw is flanged directly from the outside.

Environmentally friendly solution, because in the event of an accident, the manure or digestate is all over the Middle shaft into the lower collecting pit

Advantages of the dry rotting plant

Introduction of materials with a high dry matter content
All parts are arranged protected against frost and the environment
No size reduction of the raw materials
No electrically or mechanically driven parts in the dry rot fermenter
low maintenance
low maintenance costs

Claims (1)

Dry fermenters and wet fermenters are state of the art in biogas production. By using the floating pontoon floor, the advantages of the wet fermenter and the dry fermenter can be combined.
The container can be made from the usual materials. It is surrounded on the outside with heating cables which are integrated in an insulation.
There is an intermediate ceiling in the container, which separates the gas space and the fermenter space.
A biofilter for desulfurization of the methane gas is installed in the gas space under the ceiling.
There is a manhole in the dome as an assembly opening.
In the dry rot fermenter, the substrate lies over a floating pontoon floor where it is fermented.
The substrate can be fed to the lower store with different fermentation times and all residues via the pontongs.
Pontongs or other floating bodies are used to achieve movement and thus self-cleaning.
In order to maintain the flowability and conveyability of the substrate suspension, the solids content is separated out via a separator and returned to the process for accelerating the rotting process.
Service column:
All supply and withdrawal lines are routed through the service pillar:
Extraction line of the gas;
Manure line for rinsing and spraying the new substrate;
Pressure line for feeding the substrate;
Manure suction line for separator.
The suction line of the cleaning screw is flanged directly from the outside.