EP3099426B1 - Separator with a bypass - Google Patents

Description

The invention relates to a classifier according to the preamble of patent claim 1, with a housing which forms a classifying chamber, in which one or more ventilation floors are arranged and in which classifying gas is flowed through in order to separate fine material from coarse material, a classifying gas inlet and a Visible material inlet opens into the viewing area and a fine goods outlet and a coarse material outlet emerge from the viewing area.

Such classifiers, which are also referred to as statically operating, serve to separate bulk materials into two fractions with different particle size distributions. The fractions are separated in the classifying chamber in which the classifying gas flows through the classifying gas in the transverse direction from the classifying material inlet in the direction of the coarse material outlet. Smaller particles are entrained by the sight gas flow and transported to the fine material outlet, while larger particles are discharged through the coarse material outlet.

The ventilation floors of a static classifier are aligned more or less transversely to the direction of movement of the material to be viewed, with a step-like arrangement of the ventilation floors being often provided ( DE 43 37 215 A1 ). According to a preferred embodiment, an essentially flat ventilation floor is provided with a plurality of ventilation slots. The ventilation floor can be composed of a large number of individually interchangeable slotted plates. The visible material falling in the visual space hits the ventilation floor or floors and the visual gas flows through there. The impact of the material to be sighted on the ventilation floor (s) can, on the one hand, increase the length of time of the material to be placed in the viewing space. On the other hand, the impact of the visible material on the ventilation floors causes deagglomeration of frequently present visual material agglomerates, the so-called Schülpen. Both improve the sighting effect of a static classifier.

Static classifiers are often combined with dynamic classifiers, with the static classifiers regularly being upstream as a coarse classifier and serving as a fine classifier. Dynamic classifiers are based on one Separation of two fractions of the material to be classified, which differ in terms of particle size distribution, by means of a rotating driven basket.

A combination of a static classifier as a coarse classifier and a dynamic classifier as a fine classifier in a circulation grinding plant for cement clinker is, for example, from the DE 43 37215 A1 known. There, the static sifter is connected downstream of a roller press and is subjected to comparatively coarse and a large number of slugs. The coarse material separated in the static classifier is returned to the roller press, while the fine material is fed to a tube mill by means of the classifying gas stream, in which it is further comminuted. The material to be viewed is then fed from the tube mill to the dynamic classifier, in which the material to be separated is separated into medium and fine material. The very fine material is then removed as finished product from the classifying gas in a separator, while the medium fine material is returned to the tube mill. With the circulation grinding plant according to the DE 43 37 215 A1 the static sifter and the dynamic sifter are separated both spatially and functionally by the interposition of the tube mill. The static classifier thus essentially serves to avoid the supply of excessively large particles or flakes to the tube mill.

A device for classifying bulk material, in which a static classifier and a dynamic classifier are connected in series in a common housing and thus flowed through by the same classifying gas flow, is shown in FIG DE 10 2011 055 762 A1 known. There, the upstream connection of the static classifier essentially serves to avoid exposure of the rotatingly driven and comparatively sensitive viewing basket of the dynamic classifier to large particles and flakes.

In the DE 10 2011 055 762 A1 it is also disclosed that, in addition to a main visible gas inlet for a static classifier, additional openings can be provided which can be closed by means of flaps or slides can, whereby a regulation of the sight gas supplied to the static classifier should be made possible.

From the DE 24 56 970 C3 Finally, a dynamic classifier is also known, in the housing of which a bypass channel is integrated which bypasses the classifying chamber and via which a part of the dust-air mixture supplied via an inlet can be guided in the classifying room to avoid classifying. This should make it possible to specifically influence the particle sizes in the finished product leaving the dynamic classifier.

The CA 2 400 859 A1 discloses a device according to the preamble of claim 1, for separating a harvest mixture consisting of grain, chaff and grasses into its components, the device combining a sifter with a cyclone separator.

The US 2013/0032513 A1 describes a device by means of which a bulk material can both be dried and simultaneously separated into a coarse material fraction and a fine material fraction.

And from the US 1,977,479 A device for dedusting coal pieces has become known, which also combines a classifier with a cyclone separator.

On the basis of this prior art, the object of the invention was to provide a possibility of making the sighting effect of a static classifier changeable in the simplest possible way.

This object is achieved by a static classifier according to claim 1. Advantageous embodiments thereof are the subject of the further claims and result from the following description of the invention.

The invention is based on the one hand on the idea that the volume flow of the sight gas guided through the static classifier represents a control variable which can be easily influenced, the change of which has a relevant effect on the Sighting effect of the sifter. In particular, the particle size distributions of the material discharged from the static classifier on the one hand as fine material and on the other hand as coarse material can be adjusted by changing the volume flow of the classifying gas. This can be done, in particular, depending on the aggregates downstream of the static classifier (for example a mill or a dynamic classifier). A change in the drying effect of the (possibly heated) sight gas can also be achieved by adjusting the volume flow.

In this case, the volume flow of the sight gas could in principle be adjusted to the intended sighting effect by correspondingly controlling a blower generating the sight gas flow. However, it is disadvantageous in this that the volume flow of the classifying gas for an aggregate downstream of the static classifier, in particular a dynamic classifier, is also changed.

In order to avoid this potential disadvantage, the invention provides, on the one hand, for the volume flow of the sight gas supplied to the static classifier, which can preferably be air, to be regulated in such a way that at least one bypass channel is provided, via which part of the sight gas flow is applied is led past the visual space.

Accordingly, a generic static classifier, which has at least one housing in which the visual space is located, in which one or more ventilation shelves are arranged and in the classifying material of classifying gas, in order to separate the classifying material into fine and coarse material, whereby (at least ) a classifying gas inlet and (at least) one classifying material inlet lead into the classifying room and (at least) one fine material outlet and (at least) one coarse material class exit from the classifying room, characterized by at least one bypass channel integrated in the housing for bypassing the classifying room, the bypass channel going out in the classifying gas inlet and flows downstream of the visual space.

A viewing space is understood in particular to mean the area of the sifter in which material sifting, that is to say a separation of material, is more specific Grain size is done. The material of coarser grain size leaves the visible space through the coarse material outlet, the material of finer grain size entering the fine material outlet. The fine material outlet is arranged downstream of the visual space and is designed in such a way that no material is viewed in it.

The bypass channel opens into the classifier downstream of the classifying space, the bypass channel opening, for example, into the fine material outlet or into a gas inlet of a second, in particular dynamic, classifier downstream of the first classifier.

A bypass duct integrated into the housing is understood to mean that at least one (preferably all) wall surface delimiting the bypass duct, preferably extending over the entire length of the bypass duct, is part of the housing and thus, in addition to the function of delimiting the bypass duct, structurally (as a supporting wall) or used functionally (e.g. to guide a medium) for other parts of the classifier.

By integrating the at least one bypass channel into the housing of the classifier, one or more advantages can be generated compared to an externally running bypass channel, which can be designed, for example, in the form of a bypass hose. In particular, a smaller space requirement, better accessibility to maintenance and inspection openings, simplified packaging and transportation of the classifier and / or a reduced assembly effort can be achieved. Compensators, which may be necessary in an external bypass duct to compensate for different thermal expansions, can also be omitted in a bypass duct integrated in the housing.

It is further provided for a classifier according to the invention that it integrates a static coarse classifier and a fine classifier downstream of it in a housing. Accordingly, it is provided that a second, in particular dynamic, classifier with a second classroom is connected to the fine material outlet, a housing forming the second classifier, which forms the second classroom surrounds, forms a medium fine material outlet and a fine material outlet. In particular, it can be provided that the fine classifier is a dynamic fine classifier, which accordingly comprises a rotatingly driven classifying rotor arranged in the second classifying chamber, for example in the form of a conventional classifying basket. Such a sifter, which comprises a static coarse sifter and a fine sifter connected downstream of it, can preferably be used in combination with (at least) one blower used for both (partial) sifters to generate the sifting gas flow.

The ability to influence the volume flow of the sighting gas through the bypass duct through the static coarse sifter has advantages in particular in the case of such a combination with a fine sifter, since in this way the volume flow through the static coarse sifter can be largely regulated independently of the volume flow through the fine sifter. In particular, provision can be made to design the total volume flow of the sight gas supplied to the classifier via the classifying gas inlet with regard to the volume flow requirement of the fine classifier and to adapt the regularly lower volume flow rate requirement of the classifier by passing a more or less large part of the total volume flow past the (first) viewing area of the classifier.

In order to keep the adjustability of the volume flow of the sight gas guided over the static coarse sifter as variable as possible, a control element can preferably be provided, by means of which the free flow cross section of the bypass channel can be changed (manually or automatically). The control element can be designed, for example, as a control flap or control slide adjustable by means of an actuator.

Furthermore, it can preferably be provided that the bypass channel forms a plurality of (spatially separated) flow channels. As a result, a more uniform distribution of the flow of the sight gas guided via the bypass channel and thereby also a more uniform introduction into the main flow of the sight gas in the fine material outlet can be achieved.

In such a configuration of the bypass channel, it can then be provided, in order to even out the partial flows of the sight gas that are conducted via the individual flow channels, that a control element is provided for several and in particular all of the flow channels. It can also be provided that the control elements can be adjusted separately.

In a further preferred embodiment of the classifier according to the invention it can be provided that the flow channels end at a distance from the mouth of the bypass channel into the fine material outlet. As a result, the partial flows through the flow channels are reunited with the main flow of the sight gas before they enter the fine material outlet and thus before they are mixed. This can have an advantageous effect on the most uniform possible introduction of the partial flow of the sight gas into the main flow via the bypass channel.

A combination of the partial flows of the sight gas conducted via the flow channels can be particularly advantageous if the sight gas flow conducted through the bypass channel is introduced into the fine material outlet via a relatively small mouth opening in the area of the mouth of the bypass channel compared to the cross-sectional dimensions of the fine material outlet. It can be particularly preferably provided that the bypass channel opens decentrally into the fine material outlet, whereby a swirl of the re-mixed total flow of the visible gas can be generated by means of the sight gas flow entering the fine material outlet, which in particular has a positive effect on the visual effect of the static coarse sifter downstream, dynamic fine classifier. It can preferably be provided that the direction of rotation of the swirl corresponds to the sight gas flow of the direction of rotation of the sight rotor of the dynamic fine classifier.

“Decentralized” is understood here to mean that the (middle) flow direction of the sight gas flow entering the fine material outlet from the bypass duct (and in particular the central longitudinal axis of the mouth opening) is the central longitudinal axis of the Cross-sectional areas of the fine material outlet in the area of the mouth of the bypass channel do not intersect. In particular, it can be provided that the sight gas flow entering the fine material outlet from the bypass channel is introduced as far as possible from the central longitudinal axis and thus as close as possible to a wall of the housing delimiting the fine material outlet.

If the classifier according to the invention has at least two bypass channels, which can preferably be arranged on opposite sides of the first classifying room, for an increased swirl effect the sight gas flows entering the fine material outlet from the two bypass channels can be provided that these two bypass channels are not only decentralized but also open diametrically to each other with respect to a central longitudinal axis of the fine material outlet in the fine material outlet.

In a further preferred embodiment of the classifier according to the invention, at least one intermediate wall arranged in the fine material outlet and oriented transversely to the ventilation floor or floors can be provided. On the one hand, the intermediate wall can stiffen the housing. On the other hand, an increase in the load-bearing capacity for the main flow as a result of an increase in the Froude number can be achieved by the at least one intermediate wall, which divides the flow space formed by the fine material outlet for the main flow of the sighting gas into a plurality of partial flow spaces. This can be relevant in particular in the design of a classifier according to the invention, in which a part of the total volume flow of the classifying gas supplied via the classifying gas inlet is to be led past the (first) flow space, if necessary, by means of the bypass channel (s).

So that the partition does not hinder the introduction of the sight gas flow conducted through the at least one bypass duct, it can preferably be provided that the bypass duct opens into the fine material outlet downstream of the partition.

In order to avoid, as far as possible, that the branching of a part of the volume flow of the sight gas from the main flow negatively influences the flow through the ventilation plate (s), it can further preferably be provided that the bypass duct is at a (as large as possible) distance in front of the ventilation plate (s) from the sight gas inlet goes off. This can be implemented in a structurally simple manner by providing a partition wall that extends the bypass channel into the sight gas inlet.

Fig. 1:

schematisch einen Sichter in einer Seitenansicht, der einen statischen Grobsichter und einen dynamische Feinsichter kombiniert;

Fig. 2:

schematisch den statischen Grobsichter des Sichters in einer Vorderansicht;

Fig. 3:

einen Schnitt durch den Grobsichter entlang der Schnittebene III - III in der Fig. 2;

Fig. 4:

einen Schnitt durch den Grobsichter entlang der Schnittebene IV - IV in der Fig. 2;

Fig. 5:

den den Sichtraum und den Feingutauslass ausbildenden Teil des statischen Grobsichters in einer perspektivischen Darstellung;

Fig. 6:

den Regelelemente zur Regelung der über die Bypasskanäle geführten Teilströmungen des Sichtgases integrierenden Teil des statischen Grobsichters in einer perspektivischen Darstellung;

Fig. 7:

eine Seitenansicht des in der Fig. 6 dargestellten Teils des statischen Grobsichters;

Fig. 8:

einen Querschnitt durch den in der Fig. 6 dargestellten Teil des statischen Grobsichters;

Fig. 9:

schematisch die Erzeugung eines Dralls der Sichtgasströmung in dem Feingutauslass;

Fig. 10:

schematisch einen Sichter gemäß einem weiteren Ausführungsbeispiel in einer Vorderansicht, der einen statischen Grobsichter und einen dynamischen Feinsichter kombiniert; und

Fig. 11:

schematisch einen Sichter gemäß einem weiteren Ausführungsbeispiel in einer Vorderansicht, der einen statischen Grobsichter und einen dynamischen Feinsichter kombiniert

The invention is explained in more detail below with reference to an embodiment shown in the drawings. In the drawings:

Fig. 1:

schematically a classifier in a side view, which combines a static coarse classifier and a dynamic fine classifier;

Fig. 2:

schematically the static coarse classifier of the classifier in a front view;

Fig. 3:

a section through the coarse sifter along the section plane III - III in the Fig. 2 ;

Fig. 4:

a section through the coarse sifter along the section plane IV - IV in the Fig. 2 ;

Fig. 5:

the part of the static coarse sifter forming the viewing space and the fine material outlet in a perspective representation;

Fig. 6:

a perspective view of the control elements for controlling the part of the static coarse sifter integrating through the bypass ducts of the classifying gas;

Fig. 7:

a side view of the in the Fig. 6 shown part of the static coarse sifter;

Fig. 8:

a cross section through in the Fig. 6 shown part of the static coarse sifter;

Fig. 9:

schematically the generation of a swirl of the sight gas flow in the fine material outlet;

Fig. 10:

schematically a classifier according to a further embodiment in a front view, which combines a static coarse classifier and a dynamic fine classifier; and

Fig. 11:

schematically a classifier according to a further embodiment in a front view, which combines a static coarse classifier and a dynamic fine classifier

The Indian Fig. 1 The classifier shown comprises a static coarse classifier 1 and a dynamic fine classifier 2 directly downstream of it. Both are integrated in a (multi-part) housing 3 and represent a functional unit.

The (partial) housing 3 of the static coarse classifier 1 forms a (first) classifying room 4, a classifying gas inlet 5, a classifying material inlet 6, a coarse material outlet 7 and a fine material outlet 8. Provided in the first viewing space 4 is a ventilation floor 9 which is oriented obliquely to the vertical and has a large number of ventilation slots (cf. Fig. 3 ). The ventilation floor forms a guide level connecting the sight goods inlet 6 with the coarse goods outlet 7. Visible material 10, which is introduced into the first classifying room 4 via the classifying material inlet 6, is guided by gravity along this guide level to the coarse material outlet 7 and at the same time flows through the classifying gas flowing through the ventilation slots of the ventilation floor 9. The classifying gas entrains sufficiently small and thus light particles of the classifying material 10, the fine material 11. The fine material 11 is discharged together with the sight gas flow into the fine material outlet 8 and from there it is fed to the downstream dynamic fine classifier 2. The part of the visible material 10 which is not entrained, the coarse material 12, is discharged via the coarse material outlet 7.

The fine material 11 is fed to the dynamic fine classifier 2 via the fine material outlet 8. By interaction of one in a (second) visual space 13 Arranged, rotatably driven classifying rotor 14 with guide vanes 15 there is a fine classifying, larger particles of the fine material 11, the medium-sized material, being discharged from the second classifying chamber 13 via a medium-fine material outlet 16, while smaller particles, the very fine material, which in particular is also can be a finished product to be produced, with which the sight gas flow flows out through a fine material outlet 17.

The static coarse sifter 1 is provided with two bypass channels 18, which are integrated in the (partial) housing 3 of the coarse sifter 1 and are provided for regulatingly passing partial flows of the total flow of the sighting gas entering the sifter via the sighting gas inlet 5 past the first sighting space 4, whereby these partial flows do not take part in the rough view taking place in the first viewing space 4. The two bypass channels 18 are arranged on two opposite sides of the first cross-sectional area 4 with fine cross-sections and fine material outlet 8. The outer walls of the housing 3 enclose both the bypass channels 18 and the visible space 4 and the fine material outlet 8, while a spatial separation between the bypass channels 18 on the one hand and the visible space 4 and the fine material outlet 8 is realized via two partition walls 19.

The partitions 19 are extended upstream of the first viewing space 4 (cf. Fig. 4 ) and protrude into the classifying gas inlet 5. As a result, the partial flows of the classifying gas guided via the bypass channels 18 are separated from the main flow running through the first classifying chamber 4 at a relatively large distance in front of (upstream) the ventilation base 9. As a result, it can be avoided as far as possible that the branching off of the partial flows negatively influences the flow through the ventilation base 9 by means of the main flow.

The branched partial flows are guided within the bypass channels 18 in a plurality of parallel flow channels 21 which are spatially separated by means of partition walls 20. Each flow channel 21 has on the input side a control element in the form of a shaft which can be rotated by about 90 ° about a shaft Control flap 22 assigned. Via the control flaps 22, the volume flow of the partial flows of the sight gas guided through the bypass channels 18 can be controlled between a minimum value, which is essentially zero when the control flaps 22 are completely closed, and a maximum value when the control flaps 22 are fully open. The Fig. 6 and 8th show the control flaps 22 in the fully closed position, while in the Fig. 4 a partially open position of the control flaps 22 is shown.

The control flaps 22 are adjusted by means of one actuator 23 per bypass channel, which acts directly on the shaft of one of the control flaps 22, while twisting this one control flap 22 via push-pull rods 24 and levers 25 onto the other control flaps 22 of the respective one Bypass channel 18 is transmitted.

The partition walls 19 separating the bypass ducts 18 from the first viewing space 4 and the corresponding part of the fine material outlet 8 end at approximately the same height as the partition walls 20 dividing the bypass ducts 18 into the flow ducts 21. Downstream thereof, the housing still forms an outlet space 26 as part the bypass channels 18 (cf. Fig. 5 ). In these outlet spaces 26, the partial flows guided in the individual flow channels 21 of the bypass channels 18 are brought together again and then enter the fine material outlet 8 via an orifice opening 27, which extends only over part of the corresponding side of the fine material outlet 8. It is provided that the two orifices 27 of the two bypass channels 18 are each arranged decentrally and also diametrically to one another with respect to a central longitudinal axis 28 of the fine material outlet 8 (cf. Fig. 9 ; in the Fig. 5 the corresponding diaphragms 30 for the partial spatial separation of the outlet spaces 26 from the fine material outlet 8 are not shown). As a result, the partial flows entering the fine material outlet 8 from the bypass channels 18 cause a swirl of the then combined total flow of the classifying gas about the central longitudinal axis 28 of the fine material outlet 8. The direction of rotation of the swirl corresponds to the direction of rotation of the classifying rotor 14 of the dynamic fine classifier 2.

In the Fig. 5 it can also be seen that the fine material outlet 8 is divided into subspaces by several (here: three) partitions 29, the partitions 29 being oriented transversely and in particular perpendicularly to the ventilation floor 9. The intermediate walls 29 serve, on the one hand, to stiffen the housing 3 and, on the other hand, to increase the load-bearing capacity of the main flow of the sight gas, which is reduced as a result of a branching of partial flows conducted via the bypass channels 18, if necessary, by increasing the Froude number. The intermediate walls 29 end downstream at approximately the same height as the partition walls 19 and the partition walls 20 and thus upstream of the orifices 27 of the bypass channels 18. As a result, they prevent the partial flows emerging from the bypass channels 18 from being mixed into the main flow of the sighting gas and the formation which occurs in the process of a twist around the central longitudinal axis 28 of the fine material outlet 8 as little as possible.

Fig. 10 shows a classifier according to a further embodiment. The classifier has a static coarse classifier 32 and a dynamic fine classifier 34 connected downstream of it. The static coarse sifter 32 is shown in a front view and essentially corresponds to that in FIG Fig. 2 shown static coarse sifter 1 with a ventilation floor 42. In contrast to that in Fig. 2 The static classifier 1 shown in FIG Fig. 10 shown static coarse sifter 32 on a housing 36, which may be tubular or with a rectangular cross section, for example, and serves as a connecting piece between the ventilation base 42 and the fine material outlet. Two bypass channels 40 are arranged around the viewing space 38 and within the housing 36, via which partial flows of the total flow entering the static classifier 32 are controllably guided past the ventilation floor 42 and the first viewing space 38. In the in Fig. 10 In the illustrated embodiment of the classifier, the housing 36 extends in an arc towards a dynamic classifier 34 adjoining the static classifier 36, so that the flow flowing through the static classifier 32 is deflected by approximately 180 ° and flows into the dynamic classifier 34. The spatial separation of the viewing space 38 and the Fine material outlet of the static classifier 34 and the bypass channels 40 is realized by partition walls 46. The partition walls 46 extend along the housing 36 of the static classifier 32. The area of the static classifier adjoins the classifying room 38 of the static classifier, in which the material is no longer viewed. The partition walls 46 of the bypass channels 40 extend in Fig. 10 over the length of the viewing space 38 and over the length of the housing 36 in which coarse material is separated. The dividing walls 46 end in the fine material outlet adjoining the visible space 38 and the bypass flow and the sighted fine material flow are brought together and enter the dynamic classifier 34.

In contrast to the previous one with regard to the Figures 1 to 9 Sifter described, the fine material leaving the static sifter is fed into the dynamic sifter 34 at the level of the sifting rotor 44 essentially horizontally.

Fig. 11 shows a classifier according to a further embodiment. The in Fig. 11 sifter essentially corresponds to that in Fig. 10 shown classifier with the difference that the partition 48 of the Fig. 11 extends beyond the fine material outlet to the inlet into the dynamic classifier 34. The bypass flow and the sighted fine material flow are in the in Fig. 11 Embodiment shown merged downstream of the viewing space 38 and downstream of the fines outlet. The partitions 48 end at the downstream end of the fines outlet at the entrance to the dynamic classifier. It is also conceivable that the partition walls 48 extend a little into the gas inlet of the dynamic classifier 34.

Reference list

1.

static coarse sifter

Second

dynamic fine classifier

Third

casing

4th

first visual space

5th

Sight gas inlet

6th

Visible material inlet

7th

Coarse material outlet

8th.

Fines outlet

9th

Ventilation floor

10th

Visible goods

11th

Fine goods

12th

Coarse

13th

second visual space

14th

Classifying rotor

15th

Guide vanes

16th

Medium fine outlet

17th

Fine material outlet

18th

Bypass channel

19th

partition wall

20th

Partition wall

21st

Flow channel

22.

Control flap

23rd

actuator

24th

Push-pull rod

25th

lever

26th

Outlet space

27th

Mouth opening

28th

Central longitudinal axis of the fine material outlet

29.

Partition

30th

cover

31st

static coarse sifter

32nd

dynamic fine classifier

36th

casing

38.

first visual space

40th

Bypass channel

42nd

Ventilation floor

44.

Classifying rotor

46.

partition wall

48.

partition wall

Claims (15)

1. Separator having a housing (3; 36) which configures a separation space (4; 38) in which one or a plurality of ventilation bases (9; 42) are disposed and in which separation stock (10) is perfused by separation gas so as to separate the separation stock into fine stock (11) and coarse stock (12), wherein a separation-gas inlet (5) and a separation-stock inlet (6) open into the separation space (4; 36), and a fine-stock outlet (8) and a coarse-stock outlet (7) lead out of the separation space (4), and wherein at least one bypass duct (18; 40), integrated in the housing (3; 36), for bypassing the separation space (4; 38) is provided, wherein the bypass duct (18; 40) leads out of the separation-gas inlet (5) and opens out downstream of the separation space (4; 38) characterized in that a second separation space (13) of the separator adjoins the fine-stock outlet (8), wherein a housing (3; 36) of the separator which surrounds the second separation space (13) configures a medium-fine stock outlet (16) and a finest-stock outlet (17).
2. Separator according to Claim 1, characterized in that the bypass duct (18; 40) opens into the fine-stock outlet (8).
3. Separator according to Claim 1, characterized in that the bypass duct (18; 40) opens into an entry of a second separator (2; 32) which has the second separation space (13).
4. Separator according to one of the preceding claims, characterized in that a rotatingly drivable separation rotor (14) is disposed in the second separation space (13).
5. Separator according to one or a plurality of the preceding claims, characterized in that the bypass duct (18; 40) configures a plurality of flow ducts (21).
6. Separator according to one or a plurality of the preceding claims, characterized in that the available flow cross section of the bypass duct (18; 40) is variable by way of a regulator element.
7. Separator according to Claims 5 and 6, characterized in that one regulator element is provided for each of a plurality of flow ducts (21).
8. Separator according to Claim 7, characterized in that the regulator elements are individually adjustable.
9. Separator according to Claim 5 or one of the claims dependent on Claim 5, characterized in that the flow ducts (21) terminate in the fine-stock outlet (8) at a spacing from the port of the bypass duct (18; 40).
10. Separator according to Claim 2 or one of the claims dependent on Claim 2, characterized in that the bypass duct (18; 40) opens into the fine-stock outlet (8) in a decentralized manner.
11. Separator according to Claim 10, characterized by at least two bypass ducts (18; 40) which in relation to a longitudinal central axis (28) of the fine-stock outlet (8) open into the fine-stock outlet (8) in a decentralized and diametrical manner.
12. Separator according to one or a plurality of the preceding claims, characterized by at least one intermediate wall (29) which is disposed in the fine-stock outlet (8) so as to be aligned transversely to the ventilation base(s) (9).
13. Separator according to Claim 12, characterized in that the bypass duct (18; 40) opens into the fine-stock outlet (8) downstream of the intermediate wall (29).
14. Separator according to one or a plurality of the preceding claims, characterized in that the bypass duct (18; 40) leads out of the separation-gas inlet (5) at a spacing from the ventilation base(s) (9).
15. Separator according to one or a plurality of the preceding claims, characterized by a partition wall (19) which extends the bypass duct (18; 40) into the separation-gas inlet (5).

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