DE7101390U - DIFFUSION TOWER - Google Patents

Description

BRAUNSCHWEIGISCEE MACHINERY MANUFACTURER

33 Braunschweig Am Alten Bahnhof 5

"Diffusion tower"

The innovation concerns a diffusion tower for the continuous countercurrent extraction of sugar beet pulp, fed to the mashed-in pulp at the lower end and extracted pulp at the upper end will.

Normally, each diffusion tower is equipped with a so-called sieve frame at the lower end. These The screen frame has a screen bottom and additional side screens. The juice is drawn off through these sieves.

However, a diffusion tower was also known in which the sieves for the juice extraction outside the

Tower were arranged. There were liquid separators with sieve surfaces and suitable conveying elements for Schnitzel transport used and via suitable gate valves connected to the tower.

The advantage of this design was seen in the fact that individual liquid separators by closing the associated Gate valve can be shut down and serviced or repaired without an interruption the work of diffusion, d. H. Emptying of the tower, becomes necessary.

In the course of the constructive improvements of the sieves and Wipers are relatively rare in the operation of a diffusion tower due to damage to the sieve or the stripper become so that there is the possibility of the sieves and

To maintain the scraper without interrupting operation,

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not_arriving at the moment. An increase in the sugar content of the juice was and is always interesting and worth striving for?

One use of this advantage was in the known diffusion tower with the liquid separators arranged outside but not possible because the

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Diffusion work impaired in the lower area of the tower became.

For example, this had to be fed into the lower area of the diffusion tower in the usual way • Liquid chip mixture from this area through the gate valve into the liquid separator can only be introduced by the effect of a flow before liquid separation is possible became. In the same area, however, there was also a countercurrent, caused by those Chips that were expelled through the same gate valve after the liquid had been separated. Somewhat more favorable conditions resulted in a construction variant of this well-known diffusion tower, that separate lines and gate valves for those entering the liquid separator and those discharged Schnitzel were provided. However, it could not be avoided that more or less large Schnitzel quantities were conveyed further in the tower without going through the liquid separator. So it arose a mixture of schnitzel with different sugar content. This condition prevents a proper one Work of diffusion. It has been considered this

] The disadvantage to be avoided by the fact that the schnitzel

j Liquid mixture in the liquid waste (s)

ί separator is fed in immediately, so that all

Schnitzel pass the liquid separator nuts.

The known diffusion tower described, however, could not prevail in practice because the chips are subjected to more or less strong NaJ · acanis ^ h when they pass the gate valve. Apart from mechanical · >. Destruction of the schnitzel, which leads to a high volume of pulp, can also result in nests due to the compression of the schnitzel.

The innovation is based on the task of developing the diffusion tower mentioned at the beginning in such a way that that a high sugar content of the juice is achieved by extracting the juice through sieves located outside the tower will occur without the previously unavoidable disadvantages of this type of juice extraction.

To solve this problem, the diffusion tower mentioned at the beginning is characterized according to the innovation: that several screw screens with overhung and la essential horizontally running worm shaft with

their open delivery end in the lower Turin area in preferably the same mutual circumferential distances open out, with at least one of these screw sieves is designed as a full-winged screw and at the same time for the known feed of the schnitzel-juice mixture serves, while the other is exclusively for

\ the screw sieve serving to extract the juice are ribbon-shaped wings

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initially, as already known, ensures that all the schnitzel migrate through at least one auger. Furthermore, due to the open ends of the Sieve screws, any mechanical stress, pressure or constriction of the flow path avoided. It puts ■ I therefore use a smooth chip transport, which is important for satisfactory leaching. That purpose The measure of the sieve screw, which is also used for the pulp feed, is also used for gentle pulp guidance To be designed with full wings, while the sieve screws, which are used exclusively for the extraction of juice, act as ribbon screws make sure there are no nests in the schnitzel wet can arise.

POr the smooth communication between the inside of the Sieve screws and the interior of the tower, it is particularly advantageous if the diameter and axial length of the Sieve screws are at least approximately the same size.

An embodiment of the innovatively designed Diffusion tower is shown in the drawings.

Fig. 1 shows a partially sectioned side view of the lower area of the innovatively designed Diffusion tower.

Fig. 2 shows a schematic representation of a cross section through the lower area of the innovatively designed Diffusion tower, with the screw sieve to improve the representation to scale are much larger than the tower shown.

The figures show a diffusion tower 1 for the continuous countercurrent extraction of sugar beet cossettes. The diffusion tower 1 has the shape of an upright cylinder, which consists of a bottom frame 2 and several, essentially identical to one another

710139C .2X71

Fuselage frames 3 assembled 1st. The top end 1st not shown. Concentric to the diffusion tower 1 a mechanically driven transport shaft 4 is provided at the upper and / or lower end. Transport wing 5, which are attached to the transport shaft 4 and the with adjustable guide vanes 6 attached to the fuselage frames 3 are attached, work together to generate 4 conveying forces when the transport shaft rotates, through which the im Diffusion tower 1 located mixture of sugar beet pulp and liquid in an increasing direction is moved through the diffusion tower 1.

The liquid used for leaching is fed in in the upper area of the diffusion tower 1 and from above down, d. H. guided through the diffusion tower 1 opposite to the movement of the chips. With Sugar-enriched liquid is extracted from the diffusion tower as circulation juice in the area of the bottom frame 2 1 peeled off, heated and used to cut the fresh beet pulp once. Part of that juice is withdrawn from the pulp mash and fed to further processing as operating juice, while the other Part of this liquid is used as circulation juice to make a pumpable with the brewed schnitzel

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to form, which is fed into the fusion tower 1 by a schnitzel (not shown) in the area of the base frame 2 will.

.'- According to the innovation, sieve screws 7 serve for the extraction of juice

. 8. They are sieve screws with flying

Gerter worm shaft 9, the? open at the discharge end immediately and without constrictions of flow '^' ^ © cut la the tower interior. The Siebsclinecken are equipped with hori. * * _{tally running screw axes at intervals over

_{s distributed over} the circumference of the base frame 2. A camp laterma

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⁴ 10 with; corresponding seals is used for storage eejfi

Sealing of the screw shafts 9; gear 11 is provided for driving. The drive speeds forflnett

j. la range from * o to 60 rpm.

•. Each screw sieve 7, 8 has a sieve shell 12, eee

j which led out a pipe 13 for the discharge of the juice

ι '"· let. _x

t At least one "sub example di" sieve screw 7, be

sits a RohranschluB 14, over which the schnitzel-juice mixture is supplied by the pulp pump, this self-screw 7 apart from the liquid separation I rtuf

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also has to do conveying work, it has full wings or worm flights 15, while the exclusively Sieve screws 8 serving for the extraction of juice are designed as ribbon screws.

The screw sieve 7 and 8 are arranged with their axes generally radial to the diffusion tower 1. Slight inclinations, as indicated in Fig. 2 below, are permissible if there are no dead spaces in which the chip movement is slowed down or comes to a standstill.

It has been found that the on the screw sieve 7 and 8 extracted juice has a sugar content that is against * is about 1% higher than the sugar content of a juice that is conventionally drawn off through bottom sieves.

For a gentle treatment of the schnitzel, as well as for achieving smooth flows, it is beneficial if the diameter of the screw sieve 7,8 is not, as is common with screws, small in relation to the Axial length, but are at least as large as .the lengths of the screw axes.

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At the bottom of the bottom frame 2 is in a suitable place at least one sand catcher 20 is arranged, which is equipped with a continuously or periodically operating sand discharge device 21 is equipped. The funnel-shaped container body stands with the interior of the diffusion tower 1 of the sand catcher 20 via suitable screens 22 in connection, which through the distributor of the transport shaft 4 or be kept free of strippers attached to it.

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Claims (3)

• rs / · ■ - 11 - claims for protection 1. Diffusion tower for continuous countercurrent extraction of sugar beet pulp, fed to the mashed pulp at the lower end and leached schnitzel are withdrawn at the upper end and in which the extraction liquid enriched with sugar over sieve surfaces arranged laterally outside the tower, in particular the sieve casing a screw sieve is withdrawn, thereby characterized in that several screw screens (7, 8) with overhung and im essential horizontally extending worm shaft (9) with its open discharge end in the lower Turin area (2) open at preferably equal mutual circumferential distances, with at least one of these screen screws is designed as a full-winged screw and at the same time to the known per se The schnitzel and juice mixture is fed in, while the others are used exclusively for the extraction of the juice Serving screw sieves have ribbon-shaped wings. - 12 - • r » - 12 - j 2. Diffusion tower according to claim 1 »thereby marked, dad the diameter and the axial length of the screen screws (7, 8)
are at least approximately the same size. 3. Diffusion urine according to claim 1 and / or 2, characterized in that the Sieve screws are arranged with their axes slightly inclined to the Tsrnradius.