ES2529380B1 - In-line biodigester or continuous mixing tunnel for biogas production - Google Patents

Abstract

The invention consists of an in-line biodigestor or a continuous mixing tunnel for the production of biogas that has a door and a pre-chamber at each end. The material is transported in wagons. The wagons that transport the material to be digested, previously treated, enter through one of these doors inside following guides that allow them to be positioned correctly. The wagon advances daily to the next position so that at the end of the biodigestion period, the wagon is at the end of the biodigester and the resulting effluent can pass to the next area where it will be conveniently treated. The generated biogas is concentrated in the upper chamber of the tunnel and subsequently transported to the corresponding storage tank, the biogas obtained can be used to generate electrical and / or thermal energy.

Description

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DESCRIPTION

In-line biodigester or continuous tunnel of separate mixing for biogas production. Technical sector

Biogas production through digesters.

State of the art

The need to recycle waste from any activity and the production of energy through clean sources is increasing, minimizing the environmental impact with both measures. Every day new laws are legislated that encourage the use of less polluting energies, showing society's commitment to these respectful alternatives.

There are currently various devices that allow obtaining and storing biogas, as well as elements for its transformation and subsequent use.

Basically, two types of biogas can be established:

• Landfill biogas (natural biodigestion)

• Biogas digesters (bio digestion in industrial facilities)

The present device is grouped in the digester biogas sector and is mainly intended for the production of agroindustrial biogas although it can also be used to digest wastewater and urban solid waste.

As for the possible applications, currently it is mainly used for the production of electric and / or thermal energy through various processes, natural gas production. Another interesting application is the possibility of being stored in fuel cells for later use. They also have some vehicles that use biogas as fuel.

Both in Spain and in the rest of the world there are multiple examples of biodigestion plants of different types, landfill, industrial waste, etc.

However, in all of them there is no real possibility of controlling the digestion time of the mixture since it is constantly stored in a single tank so that part of the mixture will be evacuated from it without having been properly digested. With this new device it is intended to ensure that the mixture is digested completely, and always with the same number of hours, increasing the generation of biogas with respect to the rest of biodigesters existing today.

Explanation of the invention.

The present invention relates to an in-line biodigester (Figure 1) or continuous tunnel that allows biogas to be obtained from organic waste from all sources.

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For the co-digestion of the agroindustrial material a series of previous treatments is needed, so that it will be treated before being introduced into the biodigester.

The wagons (figure 6) in which the material is deposited have wheels that are guided through rails (element 2) into the biodigester (element 3). These wagons will have an endless (element 8) that will allow their shake through the crank, according to the needs of the mixture, its bottom will have a slight inclination towards the side on which the outlet valve is located (element 9) so that its complete emptying is guaranteed. If a biofilm filter is necessary that allows better co-digestion thanks to the bacteria attached to it, it can be placed inside the wagon without affecting the auger, this filter will have a horseshoe shape, so that the The ends of the same filter are placed in two different wagons, allowing the circulation of bacteria.

After the mixture is treated and deposited in the wagons, these are introduced into the pre-chamber (element 1) of the biodigester through the entrance door. The prechamber allows insulating the inside of the biodigester from the outside. Once the wagon is introduced, the air is extracted and the door is opened that allows the passage inside.

The continuous tunnel biodigester consists of an in-line continuous digester or rectangular tunnel, in each of the small walls there is a pre-chamber and a door. The upper part will have the shape of a vault (element 5), in which the biogas produced will be accumulated before being stored in the convenient tank. It will be made of stainless steel, whose thickness and other dimensions will depend on the needs of each installation. Inside the rails or guides that allow to move and position the wagon conveniently run in such a way that the endless axes that it has, can be connected through quick couplings (element 7) to the axes that will transmit the movement through the corresponding ones mechanisms (element 6), allowing the mixture to be beaten. A number of positions will be available that allow the wagons to move one position daily so that at the end of the days necessary for optimal co-digestion the wagon is in the last position, ready to be introduced into the exit chamber, in that the biogas that enters is returned to the inside of the digester and then proceeds to the opening of the exit door, allowing the wagon to move to the next area where the effluent resulting from co-digestion can be conveniently treated to its elimination or, as a recommended solution, can be treated for later use as fertilizer, thus reusing the generated by-product.

Depending on the area in which it is located, it may be necessary to guarantee adequate temperature conditions, so it may be partially buried or some type of heating system may be necessary.

The biogas from the vault will be extracted through the pipes corresponding to a storage tank. Subsequently it is channeled to the harvesting area.

Among the advantages of this system compared to current systems, the possibility of allowing the separation of the mixture on a daily basis, assuming an increase in biogas production, optimizing the process, stands out.

Another advantage of the system is to allow the co-digestion of the brine present in by-products from olives. The brine in the current biodigesters usually stops the digestion process due to its accumulation, forcing the activity to eliminate the accumulated brine, this invention, by separating the mixture and allowing the emptying of each wagon in each cycle, prevents it it is accumulated, allowing to digest these by-products that currently are not usually treated.

All the elements of which the biodigester is composed online are equipped with the safety systems that the standard indicates for its application.

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Description of the figures

Figure 1. View of the biodigester in an empty line, transparent image so that the interior can be appreciated. Representative Image

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Figure 2. Biodigester side view.

Figure 3. Biodigester view with wagons and milkshake systems.

20 Figure 4. Biodigester front view with wagons and milkshake systems.

Figure 5. Detail biodigester with wagons and milkshake system (auger, crank and quick coupling).

25 Figure 6. Wagon with built-in augers and emptying system.

Claims (3)

5 10 fifteen twenty 25 30 ES 2 529 380 A1 1. Biodigester in line or continuous tunnel of separate mixing for the production of biogas that allows the biodigestion of waste of all kinds, coming from the agribusiness, livestock, solid waste, etc., consisting of: • Input camera (item 1). • Interior of the biodigester that has adequate conditions for the generation of biogas, as well as sufficient dimensions according to needs. • Dome or vault where the generated biogas accumulates (element 3). • Output chamber (item 4). • Guides or rails for positioning the wagons (item 2). • Semi-automatic beating devices, consisting of a crank, an endless shaft and a coupling (element 8). 2. In-line biodigester or continuous continuous mixing tunnel for biogas production according to claim 1, characterized by an internal area in which the wagons are located (figure 6) that transport the mixture to be digested and comprising a system of axes that they transmit the movement to the augers (element 8) located in the wagons by positioning them through the rails (element 2) of the biodigester. 3. In-line biodigester or continuous continuous mixing tunnel for the production of biogas according to claim 1 and 2 characterized by a system of transmission of the rotation through a quick coupling to the augers thus allowing the mixing of the mixture.