DE202012012863U1 - biogas reactor - Google Patents

Abstract

Biogas reactor, in which two reel agitators (6, 7) are accommodated in a container (1) with a circumferential cylindrical wall (2), the shafts (8, 9) of the two reel agitators (6, 7) being aligned approximately parallel to one another, wherein a first container bisector (B1) running perpendicular to the two shafts (8, 9) and through a cylinder axis (Z) surrounded by the cylindrical wall (2) has a first section A which extends from one (8) to the other shaft (9), and has second portions B which extend from each shaft (8, 9) to an inside of the wall (2), and wherein for the arrangement of the two shafts (8, 9) in the container, the following relationship applies: A / 2 = K · B, where K is a factor with a value> 1.0.

Description

The invention relates to a biogas reactor.

The EP 1 589 095 B1 discloses a biogas reactor in which two reel mixers are accommodated in a rectangular container. The shafts of the two reel agitators are arranged approximately parallel.

The known biogas reactor is a so-called "plug flow reactor" in which a biomass to be fermented is transported from an inlet provided on one narrow side of the container to an outlet provided on the opposite other narrow side of the container. The known container is made of concrete. By design, in practice, a wall thickness of such a container is usually 30 to 35 cm.

In addition, so-called "stirred tank reactors" are also generally known in the prior art. In this case, the container has a circumferential cylindrical wall. Due to the design, only a wall thickness of 20 to 25 cm is required here in practice. Ie. Container for the production of stirred tank reactors require a lower production cost.

For circulating a biomass to be fermented received in the stirred tank reactor, it is known to use propeller stirrers. Thus, a circulating around a cylinder axis flow is generated. However, such a flow causes a relatively poor mixing of the biomass. It forms a so-called swimming and / or sinking layer, which has a relatively strong cohesion in itself. Such swimming and / or sinking layers can hardly be broken up with conventional stirrers and mixed with the remaining biomass.

The object of the invention is to eliminate the disadvantages of the prior art. In particular, a biogas reactor should be specified, which enables efficient mixing of the biomass to be fermented. According to a further object of the invention, the biogas reactor should be as simple and inexpensive to produce. Apart from that, the stirring efficiency should be improved.

This object is solved by the features of claim 1. Advantageous embodiments of the invention will become apparent from the features of claims 2 to 10.

According to the invention, a biogas reactor is proposed in which two reel agitators are accommodated in a container having a circumferential cylindrical wall,
wherein the shafts of the two reel agitators are oriented approximately parallel to one another,
and wherein a first container bisector extending perpendicular to the two shafts and through a cylinder axis surrounded by the cylindrical wall has a first portion A extending from one to the other shaft and second portions B extending from each shaft to one Extend inside of the wall, and
the following relationship applies to the arrangement of the two shafts in the container: A / 2 = K * B, where K is a factor of> 1.0.

The proposed biogas reactor enables highly efficient mixing of biomass absorbed therein. Because of the proposed use of two reel agitators according to the invention, an undesirable circulating flow is reliably and reliably avoided. The proposed arrangement of the waves of the two reel agitators causes a particularly efficient mixing. Compared to conventional biogas reactors, the mixing can take place in the biogas reactor according to the invention approximately with half the energy input.

It has been found that with a choice of K> 1.1, in particular in the range of 1.5 to 1.85, a particularly efficient mixing of the biomass received in the container can be achieved.

The shafts are expediently arranged symmetrically with respect to a second container bisecting line running perpendicular to the first container bisecting line. The proposed symmetrical design enables a particularly cost-effective production of the reel agitators. It can be used identical reel agitators.

According to a further embodiment, a first end of each shaft is connected to a drive provided outside the container. A second end of each shaft is conveniently received in a wall-mounted first bearing. Furthermore, each shaft can be accommodated approximately centrally in one or two further bearings, which is supported by means of a support device against a container bottom. The proposed construction is relatively easy to produce. It is robust and prone to interference.

According to a further embodiment, a plurality of first stirring arms extend approximately perpendicularly from each shaft. A minimum distance between a free first end of a first stirring arm and the container bottom is expediently more than 25 cm, preferably more than 30 cm. Further, approximately perpendicularly from each shaft, between one of the first stirring arms and the wall, second stirring arms may extend, wherein a minimum second distance between a free second end of a second stirring arm and the container bottom is greater than the first distance. Ie. the second stirring arms are shorter than the first stirring arms. It can thus be achieved by mixing the biomass in the area adjacent to the wall by means of reel agitators. The provision of first and second stirring arms differing in length contributes to a further improvement in the efficiency of mixing by means of the coiler agitators.

An embodiment of the invention will be explained in more detail with reference to the drawings. Show it:

1 a top view of a biogas reactor,

2 a first sectional view along the section line AA 'in 1 and

3 a second sectional view according to the in 1 with B designated cutting position.

In the figures, a generally designated by the reference numeral 1 designated container a circumferential cylindrical wall 2 , a floor 3 as well as a blanket 4 on. The ceiling 4 is against the ground 3 by means of a support 5 supported, whose axis with a cylindrical wall 2 surrounding cylinder axis Z coincides. A first container bisector extending through the cylinder axis Z is designated by the reference symbol B1 and a second container bisector extending perpendicularly thereto is denoted by the reference symbol B2.

Instead of the ceiling 4 can the container 1 also have a foil roof.

In the container 1 are a first 6 and a second coiler agitator 7 added. A first wave 8th of the first coiler agitator 6 is approximately parallel to a second wave 9 of the second coiler agitator 7 aligned. The waves 8th . 9 are aligned approximately parallel to the second container bisector B2. The waves 8th . 9 cut the first container bisector B1. A first distance A of the first container bisector B1 extends between the first 8th and the second wave 9 , Second portions B each extend radially outward from the first shaft 8th to the inside of the wall 2 and from the second wave 9 also to the inside of the wall 2 ,

The waves 8th . 9 are arranged so that A / 2 is always larger than B. B is suitably 1.2 to 1.7 times of A / 2.

To drive the first shaft 8th is a first electric motor 10 and for driving the second shaft 9 a second electric motor 11 intended. The electric motors 10 . 11 are each on an outside of the wall 2 appropriate. At the opposite end is the first wave 8th in a first camp 12 and the second wave 9 in another first camp 13 held.

With the electric motors 10 . 11 become the waves 8th . 9 advantageously operated at a rotational speed of 2 to 5 revolutions / minute.

As in particular in conjunction with 3 becomes clear, are the waves 8th . 9 in a second camp 14 and another second camp 15 added. The second camp 14 is about a first support device 16 and the second second camp 15 via another support device 17 against the ground 3 supported. The second camp 14 . 15 are also via a horizontal linkage 18 fixed, which is the second camp 14 . 15 connects together and also the second camp 14 . 15 each with the wall 2 combines.

Each reel mixer 6 . 7 points approximately perpendicular to the respective shaft 8th . 9 extending first paddles 19 on. The first stirring arms 19 have a first length L1. Between one of the first stirring arms 19 and the wall 2 are each second stirring arms 20 provided with a second length L2. The second length L2 is smaller than the first length L1.

In 3 is a distance of the second stirring arms 19 to the ground 3 denoted by the reference Ab. He is expediently 20 to 40 cm.

Because of the proposed arrangement of the waves 8th . 9 can in the container 1 Biomass can be circulated in a particularly efficient way. This will be the reel agitators 6 . 7 preferably moved in opposite directions, in such a way that in the region of the second container bisector B2 to the ground 3 directed upward flow results. With the proposed biogas reactor can be safely and reliably in particular an undesirable circulating flow around the cylinder axis Z can be prevented. Furthermore, the formation of a floating and / or sinking layer is prevented.

LIST OF REFERENCE NUMBERS

1

container

2

wall

3

ground

4

blanket

5

support

6

first reel agitator

7

second reel agitator

8th

first wave

9

second wave

10

first electric motor

11

second electric motor

12

first camp

13

another first camp

14

second camp

15

another second camp

16

support means

17

further support device

18

Horizontal linkage

19

first mixer

20

second mixing arm

A

first section

B

second part

Z

cylinder axis

B1

first container bisector

B2

second container bisector

From

distance

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1589095 B1 [0002]

Claims (10)

Biogas reactor in which a container ( 1 ) with a circumferential cylindrical wall ( 2 ) two coiler agitators ( 6 . 7 ), the waves ( 8th . 9 ) of the two coiler agitators ( 6 . 7 ) are aligned approximately parallel to one another, one perpendicular to the two shafts ( 8th . 9 ) and through one of the cylindrical wall ( 2 ) surrounded cylindrical axis (Z) extending first Behälterhalbierende (B1) has a first portion A, which is from the one ( 8th ) to the other wave ( 9 ) and second sections B extending from each shaft (FIG. 8th . 9 ) to an inside of the wall ( 2 ), and wherein for the arrangement of the two shafts ( 8th . 9 ) in the container the following relationship applies: A / 2 = K * B, where K is a factor of> 1.0. Biogas reactor according to claim 1, wherein K> 1.1. Biogas reactor according to one of the preceding claims, wherein K is in the range of 1.15 to 1.85. Biogas reactor according to one of the preceding claims, wherein the shafts ( 8th . 9 ) are arranged symmetrically with respect to a second container bisector (B2) running perpendicular to the first container bisector (B1). Biogas reactor according to one of the preceding claims, wherein a first end of each shaft ( 8th . 9 ) with one outside the container ( 1 ) drive ( 10 . 11 ) connected is. Biogas reactor according to one of the preceding claims, wherein a second end of each shaft ( 8th . 9 ) in one on the wall ( 2 ) mounted first warehouse ( 12 . 13 ) is recorded. Biogas reactor according to one of the preceding claims, wherein each shaft ( 8th . 9 ) in the middle of a second warehouse ( 14 . 15 ) received by means of a support device ( 16 . 17 ) against a container bottom ( 3 ) is supported. Biogas reactor according to one of the preceding claims, wherein each shaft ( 8th . 9 ) approximately vertically a plurality of first stirring arms ( 19 ). Biogas reactor according to one of the preceding claims, wherein a minimum first distance (Ab) between a free first end of a first Rührarms and the container bottom is more than 25 cm, preferably more than 30 cm. Biogas reactor according to one of the preceding claims, wherein approximately perpendicularly from each shaft ( 8th . 9 ) between one of the first stirring arms ( 19 ) and the wall ( 2 ) second stirring arms ( 20 ), wherein a minimum second distance between a free second end of a second Rührarms ( 20 ) and the container bottom ( 3 ) is greater than the first distance (Ab).

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