Continuous digester of the production of biomethane for organic

Gas: heating and illuminating – Generators – Retort

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Details

210179, 210180, 210189, 435316, C12M 102

Patent

active

045940789

DESCRIPTION:

BRIEF SUMMARY
BACKGROUND OF THE INVENTION

The present invention relates to apparatuses intended for the continuous production of biomethane from organic substances contained in animal or vegetable waste originating essentially from agriculture or industries derived therefrom.
The invention also relates to systems for the purification of effluents containing large proportions of organic matter, since fermentation which generates methane is accompanied by a substantial reduction in the BOD&5.
In the current state of the art, the internal hydraulics of continuous digesters is not well mastered. The efficacy of the mixing systems used is doubtful; moreover, they generally have disadvantages of a mechanical or biological nature. It is not known how the incoming products are divided up in the volume of products being digested.


SUMMARY OF THE INVENTION

The present invention aims to overcome the disadvantages of the prior art and proposes an apparatus for the production of biomethane from organic substances which is such that the upper part of the digester, and its central support pillar to which it is mechanically fixed, can rotate about the vertical central axis of the vat, the upper part of the digester is supported via rollers on the upper face of the side walls and on the central pillar, which is itself supported on the floor of the vat via a step bearing, the central part of the vat is occupied by a cylindrical compartment called a primary compartment, the axis of which is one with the axis of the vat of the digester, a fixed partition passes through the vat and is located along a radius of the vat, a movable partition, rigidly joined to the upper part of the digester and to the central pillar, executes circular reciprocating movements so as to sweep the whole volume of the vat outside the primary compartment, a recirculating pump and a feed pump are fixed to the upper part of the movable partition. During the displacement of the movable partition, the recirculating pump send, on either side of the partition, the whole volume swept during the displacement, and the feed pump simultaneously introduces the products originating from the bottom of the primary compartment into the stream of products being displaced under the action of the recirculating pump. The biogas is collected by a flexible tank fixed to the movable upper part of the digester.
The apparatus according to the present invention preferably comprises a movable upper part whose supporting points are such that they allow the upper part of the digester, and the elements which are joined directly or indirectly thereto, to rotate in both directions about the vertical central axis of the vat. Beams which directly or indirectly support all the movable parts are supported at one of their ends on the upper part of the central pillar and they are rigidly joined thereto. Each beam is joined at its other end to a roller with a horizontal axis, which is supported on the upper face of the side walls, and to a roller with a vertical axis, which holds them in a vertical plane. A step bearing fixed in the slab serves as a guide for the rotational movements and as a bearing for the vertical forces of the support pillar.
The apparatus according to the present invention preferably has a fixed partition. This fixed partition completely blocks the cross-section determined at the top by the bottom of the product inlet and outlet channels, at the bottom by the heated floor, towards the outside by the side wall and towards the inside by the wall of the primary compartment.
The apparatus according to the present invention preferably has a movable wall which is such that this wall is suspended from the beam which is located above it. A connecting arm joins the foot of the movable wall to the foot of the pillar by means of a rigid connection. The movable wall sweeps the whole volume located on either side of the fixed wall by moving sometimes in one direction and sometimes in the other.
The apparatus according to the present invention preferably comprises an assembly of pumps and pipe

REFERENCES:
patent: 2050915 (1936-08-01), Beddoes et al.
patent: 2538412 (1951-01-01), Cecil et al.
patent: 4046551 (1977-09-01), Anderson
patent: 4342568 (1982-08-01), Taniguchi et al.
patent: 4356269 (1982-10-01), Thomsen et al.

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