EP3541535B1 - Separator and mill with this separator - Google Patents

Description

The present invention relates to a classifier according to the preamble of claim 1 and to a mill with such a classifier.

Sifting is generally understood to mean the separation of solids according to certain criteria such as mass density or particle size. Air sifting is a group of sifting processes in which a gas flow, the so-called sifting air, is used to achieve this separation. The operating principle is based on the fact that fine or small particles are more strongly influenced and carried away by the gas flow than coarse or large particles.

Air classifiers are used, for example, to classify coal dust or other grist from a mill. The aim here is, after the grinding process, to separate particles that have been ground sufficiently small and particles that have to be ground further. These two groups of particles are also referred to as fine and coarse material. In principle, a sifter can also be used for the separation or classification of solids of other origins.

There are different types of air separators. An essential differentiating criterion is the way in which the solids to be separated, the feed material and the sifting air are introduced into the sifter. In this way, solids and classifying air can either be introduced separately or together.

An air classifier according to the preamble of claim 1, in which solid matter and classifying air are introduced together, is from the US 2010/0236458 A1 known. The disclosed wind sifter will used for the sifting of coal dust. The gas-solid mixture of coal dust and sifting air is let into the sifter housing from below. The inlet volume flow of the gas-solid mixture flows completely from the outside into the interior of a guide vane ring. The guide vane ring has a plurality of deflection elements, between which the mixture flows. The deflection elements are tilted by 50 to 70 ° relative to the horizontal and are fixed. A sifter wheel is located inside the guide vane ring. The classifier wheel is driven in rotation and has a plurality of lamellae which run essentially vertically. Due to the flow and despite the rotation of the classifier wheel, fine particles can pass between the lamellae of the classifier wheel and are then sucked upwards. Coarse particles hit the lamellas, are thrown back in this way and finally fall down due to gravity.

Another sifter with deflection elements tilted in relation to the horizontal is the type LJKS louvre sifter, which is taken from the article " State of the classifier technology - classifier for bulk goods "by S. Bernotat, published in ZKG International 43 (1990) February, No. 2, Wiesbad en, DE, is known.

In other air separators, the guide vanes of the guide vane ring are arranged vertically, for example in FIG WO 2014/124899 A1 . The guide vanes provided there can be straight or curved. Similar air separators are also from the publications EP 1 239 966 B1 , EP 2 659 988 A1 , DE 44 23 815 C2 and EP 1 153 661 A1 known. In case of EP 2 659 988 A1 the slats are adjustable.

In the EP 1 153 661 A1 Both vertical and horizontal lamellae are used, which should lead to an overall equalization of the flow. The horizontal subdivision of the flow path should also cause the classifier wheel to have a flow over the entire height, which should contribute to an improvement in the selectivity.

A mill with an integrated classifier is off US 2012/0138718 A1 known. The deflection elements of the US 2010/0236458 A1 and the slats of the EP 1 153 661 A1 are more of an obstacle to the flow. Especially with the US 2010/0236458 A1 the mixture of feed material and sifter air flows almost vertically onto the deflection elements. In this way, a back pressure or a turbulence of the mixture can arise before it flows into the guide vane ring.

The solutions known from the prior art are therefore not sufficient to enable a controlled introduction of the mixture of feed material and classifier air into the classifying zone between the guide vane ring and the classifier wheel. The selectivity of the sifting suffers from the uncontrolled introduction.

The object of the invention is therefore to improve the selectivity of classifiers in which the feed material and classifying air are introduced together.

This object is achieved by a classifier according to claim 1. The object is also achieved with a mill according to claim 15.

Advantageous further developments are the subject of the subclaims.

The classifier according to the invention has a classifier housing. A sifter wheel having an axis of rotation X and a guide vane ring are arranged in the sifter housing. In the radial direction R perpendicular to the axis of rotation X between the guide vane ring and the classifier housing is an annular space and a viewing zone is provided between the guide vane ring and the classifier wheel.

The axis of rotation X preferably runs in the vertical direction.

The invention is characterized in that at least one deflection element is arranged at least between two adjacent vertical guide vanes, which deflection element has at least one downward curvature and / or bevel. The downward curvature and / or fold is a Controlled diversion of the gas-solid mixture into the classifier's viewing zone is possible. A fold is understood to mean an angled straight section of the deflecting element.

At least one deflecting element is preferably arranged between each two adjacent vertical guide vanes.

The advantage of these deflecting elements is that a horizontal and / or vertical downward movement component can be given to the flow of the gas-solid mixture already within the guide vane ring. This leads to an improved approach of the flow to the classifier wheel within the classifying zone, which in turn increases the separator's precision.

If a plurality of deflection elements is provided in a sifter, the deflection elements can either be identical or different. All deflecting elements are preferably identical within a sifter, which means that production costs can be reduced. Nevertheless, it can be advantageous to use differently designed deflection elements in a sifter in order to produce different effects at different points within the sifter.

Features that are described below with regard to a deflecting element can also be used in other deflecting elements in one and the same embodiment of a classifier according to the invention and preferably in all deflecting elements of this embodiment.

Generic classifiers are generally arranged in an upright position. Therefore, hereinafter referred to as "vertical" directions are parallel to the direction of gravity designated. Correspondingly, directions perpendicular to the direction of gravity are referred to as horizontal.

At least one of the deflecting elements advantageously extends over the entire width between two adjacent guide vanes. In this way, areas within the guide vane ring in which an uncontrolled flow into the viewing zone could occur are avoided.

In advantageous developments it is provided that at least one of the deflection elements extends from the guide vane ring into the viewing zone and / or into the annular space. In particular, an extension into the annular space is advantageous, since in this case the gas-solid mixture already meets the deflecting elements in the annular space and is deflected. This leads to a very controlled flow of the gas-solid mixture into the viewing zone.

In order to enable uniform deflection, at least one of the deflection elements has a changing radius of curvature in the radial direction R of the guide vane ring, at least in a partial section. At least one of the deflection elements preferably has a changing radius of curvature in the radial direction R over the entire length.

Advantageously, at least one of the deflection elements has a radially inner end with a first end section and / or a radially outer end with a second end section. The terms radially inside and radially outside refer to the guide vane ring. The guide vane ring preferably has a cylindrical basic shape. The end sections can be configured in different ways, which will be explained in more detail below.

An end section preferably comprises less than 40%, in particular less than 20% of the total length of a deflecting element.

In advantageous developments of the sifter, at least one of the end sections is straight. A section is straight if it has no curvature. This embodiment is particularly advantageous in the case of the first end section of the radially inner end. At the radially inner end, the gas-solid mixture should flow in the direction of the classifier wheel and thereby as homogeneously as possible. The straight design of the first end section favors a homogeneous flow.

Straight end sections are preferably bevelled, i. H. angled and thus form folds.

At least one of the end sections is preferably arranged horizontally. It is particularly preferably the first end section of the radially inner end. This also serves to generate a homogeneous flow in the direction of the classifier wheel.

In advantageous developments it is provided that at least one of the second end sections or its tangential extension extends at an angle α to a horizontal H, where: α 20 °. The second end sections are each arranged at an outer end of the deflecting elements. When used as intended, the gas-solid mixture reaches the deflection elements from below. It is therefore particularly advantageous if the second end sections are oriented downward at an angle α greater than or equal to 20 °. Particularly preferably, α 60 ° also applies.

A straight extension of an arcuate section that is tangential to the curvature at an end point is referred to as a tangential extension of the section is. The arcuate section is preferably viewed in cross section to determine the tangential extension.

The degree of deflection of the gas-solid mixture has an influence on the selectivity. If the deflection is too strong, turbulence or backwater can occur. Too little redirection remains ineffective.

In advantageous developments of the invention it is therefore provided that the first end section of at least one of the deflecting elements or its tangential extension and the second end section of the same deflecting element or its tangential extension run at an angle β to one another, where: β ≥ 90 °. In particular, β 120 ° applies. In addition, β 160 ° particularly preferably applies.

Depending on which solid is to be sifted and how the particle distribution contained in the gas-solid mixture is, it can be advantageous to arrange the first end section at an angle greater than 0 ° to a horizontal H. In advantageous developments it is provided that at least one of the first end sections or its tangential extension extends at an angle γ to a horizontal H, where: γ ≥ 10 °. In order to avoid that more and more coarse material ends up in the fine material, the gas-solid mixture can in this way be deflected downwards by the deflecting element and thus in the direction in which the coarse material is ultimately supposed to arrive. However, the angle γ must not be chosen too large. Preferably, γ 45 45, in particular γ 30.

With regard to the angles α, β and γ, the following applies particularly preferably: α + β + γ = 180 °. The angles are preferably below one and the same horizontal H.

It has been shown that good results with regard to the flow conditions can be achieved with one deflecting element between each two adjacent vertical guide vanes.

In advantageous developments of the sifter, provision is made for at least three to five deflecting elements to be arranged between each two adjacent vertical guide vanes. In this way, the gas-solid mixture flowing through between two adjacent vertical guide vanes is divided into partial flows, thereby avoiding turbulence.

At least one vertical flap element extending into the viewing zone is preferably arranged on the inner circumference of the guide vane ring. The vertical flap element or elements have the advantage that the flow of the gas-solid mixture emerging from the guide vane ring into the viewing zone can be adjusted even more specifically. The advantage of the flap elements is that the flow can also be given a twist, preferably in the direction of rotation of the classifier wheel.

The flap element is preferably arranged to be pivotable about a vertical axis.

The flap element is preferably arranged on the inner end face of the vertical guide vane.

The length of the flap element is preferably equal to the length of the vertical guide vane. According to a particular embodiment, the flap element is designed to be rectangular.

The flap element preferably has at least one horizontal slot. This embodiment is used when the deflection elements extend into the viewing zone. The number of horizontal slots is preferably based on the number of deflection elements. The width of the slots is adapted to the configuration, ie to the curvature and / or bevel of the first end sections of the deflecting elements.

At least one flap element preferably has a curvature and / or a bevel.

The curvature or fold of the flap element preferably points in the direction of the inner circumference of the guide vane ring.

The statements on the features of curvature and bevel and on the embodiments in connection with the deflecting elements also apply to the flap elements. These embodiments of the flap elements have the advantage that the flows through the guide vane ring can be adjusted even more specifically.

The annular space advantageously tapers towards the top. As the gas-solid mixture flows through the guide vane ring, the volume flow is gradually reduced, so that it is advantageous to steadily reduce the volume of the annular space towards the top. This is achieved through the rejuvenation.

In advantageous developments, the guide vane ring has at least one swirl breaker. Swirl breakers prevent a flow in the circumferential direction of the guide vane ring and in this way homogenize the flow of the gas-solid mixture.

The object is also achieved with a mill which is combined with a classifier according to the invention. The mill can, for example, be a pendulum mill or be a roller mill. The classifier is preferably integrated into the mill, preferably a pendulum mill or a roller mill.

Figur 1

eine schematische Seitenansicht eines Sichter im Schnitt;

Figur 2

eine Mühle mit integriertem Sichter gemäß der Figur 1 im Schnitt;

Figur 3

eine schematische Seitenansicht des oberen Abschnitt des Sichters gemäß der Figur 1 teilweise im Schnitt;

Figur 4

einen Leitschaufelkranz in einer perspektivischen Darstellung;

Figur 5

den Leitschaufelkranz der Figur 4 in einer Draufsicht;

Figur 6

einen vergrößerten Ausschnitt aus dem in den Figuren 4 und 5 gezeigten Leitschaufelkranz;

Figur 7

einen Leitschaufelkranz gemäß einer weiteren Ausführungsform in einer perspektivischen Darstellung;

Figur 8

den Leitschaufelkranz der Figur 7 in Draufsicht;

Figur 9

einen Leitschaufelkranz gemäß einer weiteren Ausführungsform in einer perspektivischen Darstellung;

Figur 10

den Leitschaufelkranz der Figur 9 in Draufsicht;

Figur 11

einen Leitschaufelkranz gemäß einer weiteren Ausführungsform in einer perspektivischen Darstellung;

Figur 12

den Leitschaufelkranz der Figur 11 in Draufsicht;

Figur 13

einen Leitschaufelkranz gemäß einer weiteren Ausführungsform in einer perspektivischen Darstellung;

Figur 14

den Leitschaufelkranz der Figur 13 in Draufsicht;

Figur 15

einen vergrößerten Ausschnitt aus dem in den Figuren 13 und 14 gezeigten Leitschaufelkranz;

Figuren 16 bis 22

verschiedene Ausführungsformen von Umfenkelementen in Seitenansicht;

Figur 23

ein Diagramm des Volumenstromanteils über der Partikelgröße.

The invention is illustrated and explained by way of example in the figures. It shows:

Figure 1

a schematic side view of a sifter in section;

Figure 2

a mill with an integrated classifier according to Figure 1 on average;

Figure 3

a schematic side view of the upper portion of the classifier according to FIG Figure 1 partly in section;

Figure 4

a guide vane ring in a perspective illustration;

Figure 5

the guide vane ring of the Figure 4 in a plan view;

Figure 6

an enlarged section of the in the Figures 4 and 5 guide vane ring shown;

Figure 7

a guide vane ring according to a further embodiment in a perspective illustration;

Figure 8

the guide vane ring of the Figure 7 in plan view;

Figure 9

a guide vane ring according to a further embodiment in a perspective illustration;

Figure 10

the guide vane ring of the Figure 9 in plan view;

Figure 11

a guide vane ring according to a further embodiment in a perspective illustration;

Figure 12

the guide vane ring of the Figure 11 in plan view;

Figure 13

a guide vane ring according to a further embodiment in a perspective illustration;

Figure 14

the guide vane ring of the Figure 13 in plan view;

Figure 15

an enlarged section of the in the Figures 13 and 14th guide vane ring shown;

Figures 16 to 22

various embodiments of Umfenkelemente in side view;

Figure 23

a diagram of the volume flow rate over the particle size.

In Figure 1 a sifter 10 is shown schematically. The separator 10 has a separator housing 20 in which an inlet 21 for a volume flow Q of a gas-solid mixture 100 is provided in a lower region.

A sifter wheel 30 and a guide vane ring 50 are arranged in the sifter housing 20. The classifier wheel 30 and the guide vane ring 50 have a common main axis, which is the axis of rotation X of the classifier wheel 30. The axis of rotation X runs in the direction of the gravitational force F. A radial direction R extends perpendicular to the axis of rotation X. An annular space 26 is provided in the radial direction R between the guide vane ring 50 and the separator housing 20. The space between the classifier wheel 30 and the guide vane ring 50 forms the viewing zone 32. The guide vane ring 50 is equipped with deflection elements 53 which have a downward curvature. The deflection elements 53 are in particular in connection with the Figures 12 to 18 described in more detail.

The classifier wheel 30 is driven in rotation by a drive device 40, so that the classifier wheel 30 rotates about the axis of rotation X.

A first outlet 22 is arranged above the classifier wheel 30. The first outlet 22 is connected to a suction device (not shown) which generates a negative pressure. When used as intended, a first type of particle 101, the fine material, is sucked off through the first outlet 22.

A funnel 25, which opens into a second outlet 23, is arranged below the classifier wheel 30. When used as intended, a second type of particle 102, the coarse material, is discharged through the second outlet 23. The classifier wheel 30 rejects large particles 102. These large particles reach the funnel 25 and from there to the second outlet 23.

The separator housing 20 is closed at the upper end by a housing cover 24.

In the Figure 2 a mill 110 is shown, which is designed as a pendulum mill. Inside the housing 112, which is closed at the top with a mill cover 114 and at the bottom by means of a mill bottom 116, there is a grinding device 118 which has several grinding pendulums 120. The classifier 10 is integrated into the mill housing above the grinding device 18. The annular space 26 is located between the mill housing 112 and the guide vane ring 50.

In the Figure 3 the upper part of the classifier 10 is shown. The classifier wheel 30 is arranged within the guide vane ring 50. A viewing zone 32 is located between the separator wheel 30 and the guide vane ring 50. The cylindrical separator housing 20 can also be designed to be conical. With such a conical sifter housing 20 '(shown in dashed lines) an upwardly tapering annular space 26 is formed.

The first outlet 22 is connected to the interior of the classifier wheel 30.

The guide vane ring 50 has a plurality of vertical guide vanes 54. Five deflection elements 53 are arranged between adjacent vertical guide vanes 54, each of which has a downward curvature.

The volume flow Q of the gas-solid mixture 100 flows from below into the annular space 26 and from there through the guide vane ring 50 into the sifting zone 32. Fine particles 101 enter the interior of the sifter wheel 30 and are sucked off through the first outlet 22. Coarse particles 102 fall down out of the viewing zone 32. The deflection elements 53 impart flow components to the gas-solid mixture flowing through the guide vane ring 50 towards the classifier wheel, which is indicated by the arrows shown.

The Figure 4 shows the guide vane ring 50 from Figure 3 in perspective view. The Figure 5 shows the top view of the in Figure 4 guide vane ring 50 shown.

The guide vane ring 50 has a plurality of vertical guide vanes 54, with five deflecting elements between each two adjacent guide vanes 54 53 are arranged. Each deflection element 53 extends over the entire width between two vertical guide vanes 54. The deflection elements 53 are arranged equidistantly in the vertical direction.

The guide vane ring 50 has a plurality of swirl breakers 52 on its outer circumferential surface. The twist breakers 52 protrude into the annular space 26 (see Figure 1 ) and oppose a flow in the circumferential direction. The twist breakers 52 have a rectangular basic shape and are made of sheet metal. The swirl breakers 52 project in the radial direction R away from the guide vane ring 50 and extend over the entire height of the guide vane ring.

In Figure 6 is an enlarged section of the in Figure 4 illustrated guide vane ring 50 is shown.

The deflection elements 53 have a downward curvature. Each deflecting element 53 has a radially inner end 55 and a radially outer end 56. In the embodiment shown, the radially inner ends 55 do not protrude into the viewing zone 32.

A first end section 57 is arranged at the radially inner end 55 of each deflecting element 53 and a second end section 58 is arranged at the radially outer end 56 of each deflecting element 53. Both end sections 57, 58 are curved.

The Figure 7 shows a further embodiment of the guide vane ring 50 in a perspective illustration. The Figure 8 shows the top view of the in Figure 7 guide vane ring 50 shown.

On the inside of the guide vane ring 50, flap elements 60 are additionally arranged, which can be pivoted about a vertical axis 62. In the embodiment shown, on the inner end face 59 (see Figure 6 ) of all vertical guide vanes, these flap elements 60 are arranged, which are pivoted in the direction of rotation D and form an angle δ with a radial direction R.

In the embodiment shown here, the angle δ is 30 °. The angle δ is preferably in the range between 0 ° and 60 °.

The Figure 9 shows a further embodiment of the guide vane ring 50 in a perspective illustration. The Figure 10 shows the top view of the in Figure 9 guide vane ring 50 shown.

The flap elements 60 have a curvature in the direction of the inner circumference of the guide vane ring 50. In Figure 10 the direction of rotation D of the classifier wheel, not shown, is shown. The free ends of the flap elements point in the direction of rotation D.

The Figure 11 shows a further embodiment of the guide vane ring 50 in a perspective illustration. The Figure 12 shows the top view of the in Figure 11 guide vane ring 50 shown.

The flap elements 60 have a curvature in the direction of the inner circumference of the guide vane ring 50. In Figure 12 the direction of rotation D of the classifier wheel, not shown, is shown. The free ends of the flap elements also point in the direction of rotation D, the classifier wheel in contrast to the Figures 9 and 10 rotates counterclockwise.

In the Figure 13 a further embodiment of the guide vane ring 50 is shown in perspective. The Figure 14 shows the top view of the in Figure 13 guide vane ring 50 shown.

In this embodiment, the deflecting elements 53 protrude with their radially inner end 55 into the viewing zone 32 (see FIG Figure 3 ) into it. In order to enable the flap elements 60 to be pivoted, they are provided with horizontal slots 64. Since five deflection elements 53 are arranged between each two vertical guide vanes 54, each flap element 60 has four slots 64.

The Figure 15 shows an enlarged section of the guide vane ring 50 of FIG Figures 13 and 14th .

In the Figures 16 to 22 various embodiments of a deflecting element 53 are shown. The deflecting elements 53 each have a radially inner end 55 and a radially outer end 56. The radially inner end 55 has a first end section 57 and the radially outer end 56 has a second end section 58. The deflection elements 53 have a downward curvature (see Figures 16 to 20 ) or a downward edging (see Figures 21 and 22nd ) on.

The deflecting elements 53 are arranged relative to an axis of rotation X of the classifier wheel (not shown here), the distance between the deflecting element 53 and the axis of rotation X being shown reduced for reasons of illustration.

The ones in the Figures 16 to 22 The illustrated embodiments differ in particular in the design of the end sections 57, 58. The end sections 57, 58 can both be curved (see FIG Figures 16 to 18 ) or both straight (see Figures 20 to 22 ), also being straight and / or curved End sections can be connected to one another via a curved central section. The Figures 21 and 22nd show deflection elements 53 with bevels.

The first end portion 57 of each deflecting element 53 or its tangential extension (see Figure 19 ) is arranged at an angle γ to a horizontal H. In the embodiments shown, the angle γ is between 0 ° (see Figure 16 ) and approx. 28 ° (see e.g. Figure 20 ). The horizontal H, which corresponds to the radial direction R, forms a right angle with the axis of rotation X.

The second end section 58 of each deflecting element 53 or its tangential extension (see e.g. Figures 16 , 17th , 19th , 20th ) is arranged at an angle α to the horizontal H. In the embodiments shown, the angle α is between approx. 35 ° (see e.g. Figure 17 ) and approx. 65 ° (see Figure 16 ).

The first end section 57 and the second end section 58 of a deflecting element 53 or their tangential extensions form an angle β. In the embodiments shown, the angle β is between approx. 108 ° (see Figure 20 ) and approx. 153 ° (see Figure 18 ).

In the embodiments shown, the angles α, β and γ result in a total of 180 °. With the exception of the angle γ in Figure 18 all angles α, β, γ are oriented downwards.

The Figure 23 shows the particle size distribution of the fines from two viewings S1 and S2. The measurements were preferably carried out by means of sedimentation analysis.

The feed material was identical in terms of particle size distribution in the two classifications S1 and S2.

The first sifting S1 was carried out with a conventional sifter. In the first sifting S1, 97% of the particles have a particle size x <28 µm. A little over 50% of the particles were smaller than 10 µm and a little under 25% were <5 µm.

A sifter according to the invention was used in the second sifting S2. This differs from the sifter of the first sifting S1 in particular in that there are four deflecting elements with downward curvatures according to FIG Figures 4 to 6 exhibited.

The second classification S2 shows that the invention achieves an improvement in the particle size distribution.

In screening S2, 97% of the particles were smaller than 10.9 µm. Almost 75% had a particle size x <6 µm and almost 50% of the particles had a particle size x <4 µm.

List of reference symbols

10

Sifter

20th

Classifier housing

20 '

conical classifier housing

21

inlet

22nd

first outlet

23

second outlet

24

Housing cover

25th

funnel

26th

Annulus

30th

Classifier wheel

32

Viewing zone

40

Drive device

50

Guide vane ring

52

Swirl breaker

53

Deflection element

54

vertical guide vane

55

radially inner end

56

radially outer end

57

first end section

58

second end section

59

Front face of the vertical guide vane

60

Flap element

62

vertical pivot axis

64

slot

100

Gas-solid mixture

101

first type of particle (fine material)

102

second type of particle (coarse material)

F.

Gravitational force

H

horizontal

Q

Inlet volume flow

R.

Radial direction

S1

first sighting

S2

second sighting

X

Axis of rotation

α

angle

β

angle

γ

angle

Claims (15)

1. Separator (10) having a separator housing (20), a separator wheel (30) which is arranged in the separator housing (20) and which has a rotation axis (X), and a guide vane ring (50) which is arranged in the separator housing (20),
   wherein an annular space (26) is provided in a radial direction (R) perpendicular to the rotation axis (X) between the guide vane ring (50) and the separator housing (20) and a separation zone (32) is provided between the guide vane ring (50) and the separator wheel (30),
   wherein the guide vane ring (50) has a plurality of vertical guide vanes (54),
   characterised in that
   at least between two adjacent vertical guide vanes (54) there is arranged at least one redirection element (53) which has at least one downwardly facing curvature and/or fold.
2. Separator according to claim 1, characterised in that at least one of the redirection elements (53) extends over the entire width between two adjacent guide vanes (54).
3. Separator according to either of the preceding claims, characterised in that at least one of the redirection elements (53) extends from the guide vane ring (50) into the separation zone (32) and/or into the annular space (26).
4. Separator according to any one of the preceding claims, characterised in that at least one of the redirection elements (53) has in a radial direction (R) of the guide vane ring (50) at least in a part-portion a changing radius of curvature.
5. Separator according to any one of the preceding claims, characterised in that at least one of the redirection elements (53) has a radially inner end (55) with a first end portion (57) and/or a radially outer end (56) with a second end portion (58).
6. Separator according to claim 5, characterised in that at least one of the end portions (57, 58) is straight.
7. Separator according to claim 5 or 6, characterised in that at least one of the end portions (57, 58) is arranged horizontally.
8. Separator according to any one of claims 5 to 7, characterised in that at least one of the second end portions (58) or the tangential extension thereof extends at an angle α with respect to a horizontal, where α ≥ 20°.
9. Separator according to any one of claims 5 to 8, characterised in that the first end portion (57) of at least one of the redirection elements (53) or the tangential extension thereof and the second end portion (58) of the same redirection element (53) or the tangential extension thereof extend at an angle β with respect to each other, where β ≥ 90°.
10. Separator according to any one of claims 5 to 9, characterised in that at least one of the first end portions (57) or the tangential extension thereof extends at an angle γ with respect to a horizontal, where γ ≥ 10°.
11. Separator according to any one of claims 1 to 10, characterised in that at least one vertical flap element (60) which extends into the separation zone (32) is arranged on the inner periphery of the guide vane ring (50).
12. Separator according to claim 11, characterised in that the length of the flap element (60) is equal to the length of the vertical guide vane (54).
13. Separator according to either claim 11 or 12, characterised in that at least one flap element has at least one curvature and/or fold.
14. Separator according to any one of the preceding claims, characterised in that the guide vane ring (50) has at least one torsion breaker (52).
15. Mill (110), in particular pendulum mill or roller mill, having a separator (1) according to any one of the preceding claims.

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