WO1991017813A1

WO1991017813A1 - Device for separating fluids from a gas current, especially for oil mist

Info

Publication number: WO1991017813A1
Application number: PCT/EP1991/000813
Authority: WO
Inventors: Helmut Kittler
Original assignee: Rentschler Reven-Lüftungssysteme GmbH
Priority date: 1990-05-23
Filing date: 1991-04-26
Publication date: 1991-11-28
Also published as: DE4016582C2; DE4016582A1

Abstract

To improve the cleaning action in a device for separating fluids from a gas current, especially for oil mist, with two curved deflection surfaces facing each other on their concave sides with some lateral staggering, along which a current of air to be cleaned flows in succession, it is proposed that at least one of the deflection surfaces extends over an arc or more than 180° and that the gas stream substantially tangentially entering the chamber formed by this deflection surface crosses the flow path of the entering gas current on leaving the chamber.

Description

SEPARATOR FOR LIQUIDS FROM A GAS FLOW,

ESPECIALLY FOR OLNEBEL

The invention relates to a separator for liquids from a gas stream, in particular for oil mist, with two curved deflecting surfaces opposite one another, laterally offset with the concave sides, along which a gas stream to be cleaned flows in succession.

Such an oil mist separator is known for example from DE-OS 35 21 927. It is used, for example, to clean air streams contaminated by oil mist or similar substances in kitchens or in factory halls. For this purpose, these air streams are guided along the deflection surfaces. Air droplets entrained on the deflection surfaces are thrown by the deflection and settle there, while the air stream freed from the oil droplets and other liquid particles then leaves the oil separator again. The direction change is repeated in known separators carried out one after the other, for this purpose in known oil separators, a larger number of opposing deflection surfaces adjoin one another in such a way that the air flow flows along a larger number of deflection surfaces while swirling.

It is an object of the invention to improve a generic liquid separator in such a way that a more effective separation of the liquid droplets can be achieved with a smaller size and in particular a smaller number of deflecting surfaces.

This object is achieved according to the invention in a separator of the type described in the introduction in that at least one of the deflecting surfaces extends over a circumference which is greater than 180 ° and in that it is essentially tangential into that formed by this deflecting surface Chamber entering gas stream when exiting the chamber crosses the flow path of the entering gas stream. It has surprisingly been found that precisely such a crossing of the gas stream entering a deflection chamber and of the gas stream exiting from the same deflection chamber enables particularly effective cleaning and separation in the crossover area, probably because it effectively swirls the gas flow in the entry area into a deflection chamber occurs, so that the droplets entrained in the gas stream are deposited particularly effectively on the deflection surface.

It can be provided that a first deflection surface first acted on by the gas stream extends over a circumference of less than 180 ° and the gas stream is lets out an acute angle to the direction of incidence. The deflection of the first deflection surface, which is thus less than 180 °, and the deflection of the second deflection surface, which deflects over an angle of more than 180 °, can be coordinated with one another in such a way that both deflection surfaces jointly deflect the gas flow by an angle , which overall is somewhat larger than 360 °. It is advantageous if the deflection direction is the same on the first and on the second deflection surface.

In a further preferred exemplary embodiment, a third adjoins the second deflecting surface, which extends circumferentially over more than 180 ° and deflects the gas stream emerging from the second chamber to such an extent that it leaves the third deflecting surface on a path crossing the incoming gas stream. In this way, a second crossing point is obtained which adjoins the first and at which the remaining liquid particles are thoroughly separated again. It is advantageous if the deflection direction on the third deflection surface is opposite to that of the second deflection surface.

The arrangement is advantageously made such that the gas stream leaving the first deflecting surface and the gas stream leaving the third deflecting surface run essentially parallel.

It is furthermore advantageous if the first and the third deflection surface are arranged next to one another and open together towards the second deflection surface. In a further preferred exemplary embodiment, the third is followed by a fourth deflecting surface which directs the gas stream leaving the third deflecting surface in a direction parallel to the direction of entry of the gas flow into the first deflecting surface. In this arrangement, the gas flow is thus deflected by the four deflecting surfaces first in one direction by slightly more than 360 ° and then in the opposite direction by the same angle, so that it leaves the oil separator offset parallel to the inflow direction and laterally opposite the inflow point.

Here, too, it is advantageous if the second and fourth deflecting surfaces are arranged next to one another and open together towards the first and third deflecting surfaces, the second and fourth deflecting surfaces preferably deflecting the gas flow in the same direction.

It is advantageous if the edges of the deflecting surfaces have thickened areas with a circular arc in cross section. It has been found that these thickenings lead to a particularly effective separation of the liquid which is entrained by the gas flow along the deflecting surfaces. The gas stream breaks off at the thickenings without taking the liquid particles with them, which can then flow off at the thickenings of the deflection surfaces.

In a particularly preferred exemplary embodiment, an inlet gap for the gas stream to be cleaned is arranged between two second deflecting surfaces which are formed in mirror image with respect to one another, and in the flow direction behind the gap there is a flow divider which is triangular in cross section, side surfaces which are spaced apart from one another are each part of a first deflecting surface, these first deflecting surfaces being formed in mirror image of one another. This results in a particularly compact arrangement which divides the incoming gas flow into two parts flowing in mirror image to one another. In this case, it is advantageous if the third and fourth deflecting surfaces adjoining the first and second deflecting surfaces which are formed in mirror image are also mirror images of one another on opposite sides of the gap.

Two fourth deflecting surfaces embodied in mirror image to one another advantageously meet at an acute angle at the outlet of the gas stream, the tip being directed towards an outlet gap between two adjacent, third mirror deflecting surfaces embodied in mirror image. In this way, in the described construction, incoming gas flows are introduced into two separating units which are formed in mirror image to one another and each have four deflecting surfaces, which then leave them laterally offset with respect to the incoming flow. In the outlet area, the exiting gas stream combines with an adjacent, cleaned gas stream which originates from a second gas stream entering the unit, which in turn has been divided. If a larger number of such units are used side by side, equidistant inlet gaps are distributed over the inlet surface, which are opposed by equidistant outlet gaps on the opposite side of the separator, which are each located between two inlet gaps. It is particularly expedient if two pairs of first and third or second and fourth deflecting surfaces formed in mirror image form a common component and if these components are mutually offset by approximately half the width. The deflection surfaces are preferably perpendicular, so that the separated liquid can run off downwards.

Second and fourth deflecting surfaces and first and third deflecting surfaces can each be held on a common support, it being particularly advantageous if the supports are displaceable relative to one another transversely to their longitudinal extent, so that the distance between the first and third is thereby achieved Deflection surfaces on the one hand and second and fourth deflection surfaces on the other hand are adjustable. This enables easy access to the deflecting surfaces by simply pushing the supports far apart. In this way, the deflecting surfaces can be cleaned in a simple manner, for example by brushing, washing or spraying.

A trough can be arranged between the supports, it being advantageous if a collecting surface is arranged on both sides of the trough, which extends essentially horizontally under the deflection surfaces.

The collecting surfaces can be part of the carrier and can support the deflecting surfaces.

In a preferred embodiment, the collecting surfaces go at their opposite the trough Page in a vertical support wall against which the components containing the deflection surfaces lie. The components containing the deflection surfaces can be bent from sheet metal or stainless steel, it is advantageous if these components are extruded parts.

The following description of preferred embodiments of the invention serves in conjunction with the drawing for a more detailed explanation. Show it:

Figure 1 is a cross-sectional view of a first preferred embodiment of an oil separator with a plurality of components each containing two pairs of deflection surfaces;

Figure 2 is a sectional view taken along line 2-2 in Figure 1 and

Figure 3: a view similar to Figure 1 in a modified embodiment of an oil mist separator.

The oil mist separator shown in the drawing comprises two supports 1 arranged parallel to one another, which have a horizontal support and collecting surface 2, followed by a downwardly directed guide wall 3 on the opposite inside and a vertically projecting support wall 4 on the outside. These two mirror images, which are arranged at a distance from one another, are, for example, correspondingly bent metal profile rails which are not shown by one in the drawing the distance between the drive shown can be adjusted, as indicated by the arrows C and D in FIG. 2.

The guide walls 3 laterally delimit a trough 5 which is arranged between the two supports and extends over their entire length and which is connected to a drain in a manner which cannot be seen from the drawing.

A larger number of identically designed components 6 are held on the collecting surfaces 2 of the two supports, and their rear faces 7 rest against the supporting walls 4. These components 6 are all of the same design, several such components 6 are arranged on each carrier 1 in such a way that a gap 8 or 9 remains free between adjacent components 6, the gaps 8 or 9 of the mutually opposite carriers being respectively one half the length of the components 6 are offset from one another, that is to say the components 6 on the two mutually opposite supports are also offset from one another by half a length of the components 6 (FIGS. 1 and 3).

Each component 6 is mirror image of a central plane running perpendicular to the beams 1. This central plane of each component 6 coincides with the center of the gap 8 or 9 on the opposite support, and in the region of this central plane each component 6 has a flow divider 10 standing at an acute angle, the tip 11 of which splits into the gap 8 or 9 of the each opposite carrier is directed. The side surfaces 12 of each flow divider 10 merge into concave deflection chambers 15, 16 as seen from the opposite support, two of which are provided in each component 6 on both sides of the flow divider 10 and are mirror-symmetrical due to the overall symmetry of the component.

The exact shape of the deflection chambers 15 and 16 is discussed below with reference to the flow path 13, which results from the arrangement of these components for a gas flow entering the gap 8 between two adjacent components 6 of a carrier perpendicular to the longitudinal extent of the carriers. This entering gas stream is characterized by arrow A in FIG. 1.

Such a gas stream, which is loaded with liquid particles according to the task and is to be cleaned by them, enters through the gap 8 between two adjacent components 6 and meets the flow divider 10 of the opposite component 6. The gas stream is divided at the flow divider, in In the following, only the part deflected to the right is considered in more detail. Due to the symmetry of the overall arrangement, the flow path for the half separated to the left is obtained accordingly.

The gas stream flows from the tip 11 of the flow divider 10 along a first deflection surface 21, which is formed by the side surface 12 of the flow divider 10 and by the adjoining, approximately circular wall of the deflection chamber 15 of the opposite component 6. At this deflection surface 21, the gas flow is deflected to the right by not quite 180 ° and thereby reaches the deflection chamber 16 of the opposite component 6, which is the Gap 8 is adjacent. The deflection chamber 16 forms a second deflection surface 22 with an essentially circular curve, which, however, extends over a circumference of significantly more than 180 °, so that the gas flow at the deflection surface 22 is deflected to the right by an angle of approximately 240 ° . The gas stream emerging from the deflection chamber 16 crosses the gas stream entering the deflection chamber 16, the crossover point 25 is located approximately in the middle between the two supports exactly above the trough 5. The arrangement is such that both a deflection in the same direction, that is to the right in the exemplary embodiment shown, is carried out on the first as well as on the second deflection surface.

After the crossover point 25, the gas flow enters the deflection chamber 16 of the opposite component 6, namely through the strong deflection at the deflection surface 22 to the outer end of this deflection chamber 16. This forms a third deflection surface 23, which is designed in the same way as the deflection surface 22 of the opposite component 6, but which is now flowed through in the opposite direction. This deflection surface also results in a deflection of approximately 240 °, but this time to the left. This also leads to a crossover of the gas stream entering and exiting the deflection chamber 16, the crossover point 26 is located directly next to the crossover point 25, so that there is a turbulent flow area in the region of the two crossover points. The gas stream then arrives again in the deflection chamber 15 of the opposite component 6, this chamber forms a fourth deflection surface 24, which Deflects gas flow again by an angle of about 150 ° to the left, this deflection corresponds to the deflection at the first deflection surface 1, but in the opposite direction. The gas stream leaves the deflection chamber 15 along the flow divider 10 through the gap 9 approximately parallel to the direction of the incoming gas stream (arrow A). The emerging gas stream is symbolized by arrow B in FIG. 1.

It can be seen from the illustration in FIG. 1 that, due to the special design and arrangement of the deflecting surfaces 21 to 24, the gas flow covers an U-shaped path with two crossing points, two almost complete reversals of the flow direction and two three-quarter circular orbits, the deflection direction is the same for the first two distractions and opposite for the other two distractions.

This complicated routing of the flow path is fulfilled in the same way for both partial flows into which the gas flow divides after entering the gap 8 through the flow divider 10.

Since there are several components 6 of the same structure in each carrier, a contaminated gas quantity can be extracted from a room in a plurality of gas streams arranged next to one another, the extracted gas streams each being divided into two partial streams, which in turn then separate themselves combine again with a further partial flow and emerge clean again on the other side of the liquid separator. The cleaning of the liquid particles takes place by means of a cyclone effect in the individual deflection chambers, the cleaning effect being considerably improved by the crossover and the swirling caused thereby. Such a complementary cleaning action could be called the X-cyclone action.

At the ends of the deflection chamber 16, the respective deflection surfaces end in thickenings 27 and 28 with an arcuate cross-section, which particularly promote the tearing off of a cleaned gas stream from the separated liquid particles and thus support the cleaning process. The remaining liquid particles run vertically downwards on the vertical deflecting surfaces 21 to 24 and in particular in the area of the thickenings 27 and 28 and reach the trough 5 there either directly or via the collecting surface 2.

A particular advantage of the arrangement described can be seen in the fact that it consists of nothing but identical components 6 which have a high degree of symmetry. This also makes it possible to flow through the oil separator in the opposite direction, the effect remains the same.

The exemplary embodiments in FIGS. 1 and 3 do not differ fundamentally; the same parts therefore have the same reference numerals. In the embodiment of FIG. 1, however, the spacing of the carriers from one another is somewhat larger, and accordingly the deflecting surfaces in the direction transverse to the longitudinal direction of the carrier are somewhat elongated than in the embodiment of FIG. 3. These two Figures illustrate that the exact dimensions of the deflecting surfaces can be varied, provided that the essential flow path is maintained, in which at least one crossover occurs.

In the exemplary embodiment shown, the gas flow crosses twice during a complete passage. In principle, it would be possible to omit the third and fourth deflection surfaces and to use only one arrangement with a first and a second deflection surface, in which only a single crossover occurs. Even then, a surprisingly good separation of the liquid particles would be possible, but this separating effect improves again considerably if the embodiment described with reference to the drawing is used with four deflecting surfaces, which produces the described X-cyclone effect.

The change in distance between the two carriers is not only advantageous in order to enable access to the individual components 6 from the chamber side, for example for cleaning purposes, but this change in distance also enables the flow conditions to be influenced, since the precise adjustment of the mutual Distance of the components 6, the swirling and the exact guidance of the gas flow can be changed. This is clearly shown by the fact that the flow path does not run exactly perpendicular to the carrier, but rather obliquely with respect to the carrier, so that the impact points on the opposite component can be influenced by the changes in distance. An additional adjustment possibility is obtained in this way.

Claims

P A T E N T A N S P R Ü C H E

Separator for liquids from a gas stream, in particular for oil mist, with two curved deflecting surfaces which are laterally offset from one another with the concave side and along which an air stream to be cleaned flows in succession, characterized in that at least one of the deflecting surfaces (22) extends over a circumference that is greater than 180 °, and that the gas stream entering the chamber (16) formed essentially by this deflecting surface (22) at the outlet from the chamber (16) crosses the flow path of the incoming gas stream.

2. Separator according to claim 1, characterized in that the deflected surface (21) first acted upon by the gas stream extends over a circumference of less than 180 ° and allows the gas stream to emerge at an acute angle to the direction of incidence.

3. Separator according to claim 2, characterized in that the deflection direction on the two deflection surfaces (21, 22) is the same.

4. Separator according to one of the preceding claims, characterized in that a third deflecting surface (23) adjoins the second deflecting surface (22), which extends circumferentially over more than 180 ° and that of the second deflecting surface (22nd ) exiting the gas stream so strongly that it leaves the third deflecting surface (23) on a path crossing the incoming gas stream.

Separator according to claim 4, characterized in that the deflection direction on the third deflection surface (23) is opposite to that of the second deflection surface (22).

6. A separator according to claim 4, characterized in that the gas flow leaving the first deflection surface (21) and the gas flow leaving the third deflection surface (23) are substantially parallel.

Separator according to one of claims 4 to 6, characterized in that the first and the third deflecting surface (21, 23) are arranged side by side and open together towards the second deflecting surface (22).

8. Separator according to one of claims 4 to 7, characterized in that the third deflecting surface (23) is followed by a fourth deflecting surface (24) which leaves the third deflecting surface (23) gas stream in a direction parallel to the inlet direction direction of the gas flow in the first deflecting surface (21).

9. A separator according to claim 8, characterized in that the second deflection surface (22) and the fourth deflection surface (24) are arranged next to one another and open together towards the first deflection surface (21) and the third deflection surface (23).

10. Separator according to one of claims 8 or 9, characterized in that the second deflecting surface (22) and the fourth deflecting surface (24) deflect the gas flow in the same direction.

11. A separator according to one of the preceding claims, characterized in that the edges of the deflecting surfaces (21, 22, 23, 24) have thickened portions (27, 28) with a circular arc shape in cross section.

12. A separator according to one of the preceding claims, characterized in that an inlet gap (8) for the gas stream to be cleaned is arranged between two mirror-image-forming mutually formed, side by side an¬ arranged second deflection surfaces (22) and that behind in the flow direction the gap (8) has a flow divider (10) with a triangular cross-section, the side surfaces (12) of which are spaced apart from one another are each part of a first deflection surface (21), these first deflection surfaces (21) being formed in mirror image of one another.

13. A separator according to claim 12, characterized in that the first deflecting surfaces (21) and second deflecting surfaces (22) which follow the mirror image are formed by third deflecting surfaces (23) and fourth deflecting surfaces (24) on opposite sides of the gap (8). are also mirror images of each other.

14. A separator according to one of claims 12 or 13, characterized in that two mirror-image-forming fourth deflection surfaces (24) meet at an acute angle at the outlet of the gas stream and that the tip on an outlet gap (9) between two adjacent, is directed in mirror image third deflecting surfaces (23).

15. Separator according to one of claims 12 to 14, characterized in that in each case two pairs of mirror-image trained pairs of first and third deflecting surfaces (21, 23) or of second and fourth deflecting surfaces (22, 24) a common construction ¬ form part (6) and that these components (6) mutually offset against each other about half the width.

16. Separator according to one of the preceding claims, characterized in that the deflecting surfaces (21, 22, 23, 24) are perpendicular.

17. A separator according to claim 16, characterized in that second and fourth deflecting surfaces (22, 24) and first and third deflecting surfaces (21, 23) are each held on a common support (1).

18. A separator according to claim 17, characterized in that the supports (l) ^'are mutually displaceable transversely to their longitudinal extent, so that thereby the distance between the first and third deflecting surfaces (21, 23) on the one hand and second and fourth deflecting surfaces (22, 24) on the other hand is adjustable.

19. Separator according to one of claims 17 or 18, da¬ characterized in that a trough (5) is arranged between the carriers (1).

20. A separator according to claim 19, characterized in that on both sides of the trough (5) a collecting surface (2) is arranged which extends substantially horizontally under the deflection surfaces (21, 22, 23, 24).

21. A separator according to claim 20, characterized in that these collecting surfaces (2) are part of the carrier (1) and that the deflecting surfaces (21, 22, 23, 24) are carried by the collecting surfaces (2).

22. A separator according to claim 21, characterized in that the collecting surfaces (2) pass from their side opposite the trough (5) into a vertical support wall (4) on which the deflecting surfaces (21, 22, 23, 24) containing components (6).

23. A separator according to one of the preceding claims, characterized in that the components (6) containing the deflecting surfaces (21, 22, 23, 24) are extruded parts.