WO2009095008A2

WO2009095008A2 - Mist collector unit

Info

Publication number: WO2009095008A2
Application number: PCT/DE2009/000139
Authority: WO
Inventors: Roman Kaiser; Matthias Jansen; Roland Krauss; Helmut Kanka; Joachim Frahm; Peter Mandres
Original assignee: Munters Euroform Gmbh
Priority date: 2008-02-01
Filing date: 2009-01-30
Publication date: 2009-08-06
Also published as: DE102008007099A1; WO2009095008A3; DE102008007099B4

Abstract

A mist collector unit for separating fluid particles from a gas flow for flue gas scrubbers and similar devices is described, comprising at least one mist collector disposed in a gas flow channel and configured as a rod or pipe collector. In order to help produce a uniform gas flow speed across the gas flow channel cross-section, the gas passage regions between the rods/pipes of the rod/pipe collector are configured in different sizes and adjusted to the gas flow speed distribution in the gas flow channel.

Description

The droplet

The present invention relates to a droplet separator unit for separating liquid particles from a gas stream for flue gas scrubbers and the like. Devices with at least one arranged in a gas flow channel dropper, which is designed as a rod or pipe separator.

Such rod or Rohrabscheider are known. They have a multiplicity of parallel rods and tubes arranged at equal distances from each other, through which the gas flow passes through the passage areas between the rods or tubes. Here, the liquid particles contained in the gas stream are deposited on the rods or tubes of the rod or Rohrabscheiders.

It is also already known to use such known rod or pipe separator in combination with other droplet separators, such as lamella separators. Here, successively in the gas flow channel several droplet deposition layers are arranged, wherein the rod or Pipe separator is usually the first droplet, which is contacted by the gas stream.

Furthermore, DE 10 2006 011 185 A1 discloses a droplet separator arrangement which has at least one droplet separator layer and a rectifier layer arranged upstream in the gas flow direction. The rectifier elements of the rectifier layer are rods or tubes which are arranged with the same cross sections at equal intervals over the cross section of the gas flow channel. The rectifying elements rectifying elements are arranged in the form of a V or an inverted V of opposite slope to that of the mist eliminator profiles of the mist eliminator layer. In this way, water drainage is provided and rapid contamination of the intended rectifier layer is avoided.

EP 1 601 442 B1 discloses a droplet separator unit for separating liquid particles from a gas stream for flue gas scrubbers and the like. Like. Facilities known which has a mist eliminator. The droplet separator unit has, at a distance from the outlet side of the droplet separator behind it, a device extending over a partial section of the surface of the droplet separator for reducing the flow velocity of the gas flow at this surface section section of the droplet separator. The device for reducing the flow velocity of the gas stream is preferably formed as a plurality of passage openings exhibiting sheet, in particular as a perforated plate or perforated plate. The solution described above is based on the idea to bring about a homogenization of the flow velocity through the mist eliminator, that this is followed by a device which leads to a reduction in the flow velocity at the mist eliminator, namely, this device is associated with the area of the mist eliminator has an increased flow velocity compared to the remaining area of the droplet separator. As a result, the increased flow rate is reduced in this region of the droplet separator and is preferably adapted to the flow velocity of the remaining droplet separator region, so that overall a relatively uniform flow velocity results over the surface of the droplet separator. The additional flow resistance generated by the means for reducing the Strömαngsgeschwindigkeit is suitably adapted to the operating data and the geometry of the respective droplet, so that a reduction of speed peaks achieved at the mist eliminator and thus the performance of the droplet is significantly improved.

The above solution works satisfactorily. In this way, the desired flow rate uniformity can be achieved in particular by simple retrofitting of existing devices. However, in this case the device for reducing the speed in the gas flow direction behind the mist eliminator ^'is arranged. The present invention has for its object to provide a Tropfenabscheidereinheit of the specified type, with the flow rate equalization can be achieved as close as possible to the Tropfenabscheiderwirkungsbereich.

This object is achieved according to the invention in a Tropfenabscheidereinheit of the specified type in that the homogenization of the gas flow velocity over the gas flow channel cross section, the gas passage areas between the rods / tubes of the rod / tube separator formed differently sized and adapted to the gas flow velocity distribution in the gas flow channel.

In contrast to the prior art described above, in which a device for reducing the flow velocity is arranged downstream of a mist eliminator, the present invention provides for configuring the droplet separator itself in such a way that an equalization of the gas flow velocity over the gas flow channel cross section is achieved. This is achieved according to the invention in such a way that the gas passage areas between the individual bars / tubes of the bar / tube separator are of different sizes, specifically such that small gas passage areas are provided in the region of high flow velocity and large gas passage regions in the region of low gas flow velocity. By means of these measures, a corresponding compensation of flow velocity peaks takes place, which leads to an overall homogenization of the flow velocity. leads. This solution has the advantage that the corresponding homogenization is achieved in the droplet separator area itself.

In order to vary the gas passage areas in the manner according to the invention, the invention provides essentially two preferred solutions: on the one hand the distances between the bars / tubes of the bar / tube separator are of different sizes and, on the other hand, the cross sections of the bars / tubes of the bar / Rohrabscheiders of different sizes. Of course, both solutions can be combined. The gas flow channels described herein, such as flue gas scrubbers, often have deflections that produce corresponding flow velocity peaks. For example, such gas flow channels are arranged vertically and have a deflection in the horizontal direction, which can be provided before and / or after the mist eliminator. With deflections of this type, flow velocity peaks in the interior of a deflection preferably occur. The invention therefore envisages, in a special embodiment, that the gas passage areas between the bars / pipes of the bar / tube separator are small in the interior area of a deflection of the gas flow channel and large outside.

If the gas flow channel is formed vertically, it is essentially the same in which direction the rods / tubes of the 3tab / tube separator are positioned in the cross-sectional plane of the separator. If the gas flow channel has a corresponding deflection, as described above, the longitudinal axes of the rods / tubes of the rod / tube separator are preferably arranged perpendicular to the gas flow direction in the horizontal part of the gas flow channel. In another solution, the longitudinal axes of the rods / tubes of the rod / tube separator are arranged parallel to the gas flow direction in the horizontal part of the gas flow channel.

The rods / tube of the rod / pipe separator may be flat, inclined, roof-shaped or V-shaped. Other embodiments are also possible. In a special embodiment, which is used in particular in an inclined, roof-shaped or V-shaped arrangement, the rods / tubes are cup-shaped and serve to drain water. The rods / tubes therefore form Wasserabführrinnen in this case. The interior of pipes can also be used for water drainage.

In a particularly preferred embodiment, the rod / tube separator has a plurality of rod / tube packages, each having the same gas passage areas, but different gas passage areas from one package to another. This results in Montageerleirhterungen. Thus, it is not necessary to balance individual bars / tubes with regard to their spacing, but finished packages can be installed which have gas passage areas of different sizes from one package to the next. Thus, for example, a package is arranged in the interior region of a deflection, in which the gas passage areas are small, while in the outer area a package is arranged in which the gas passage areas are large. The droplet separator unit formed according to the invention may have a single rod / tube separator or a plurality of rod / tube separators connected in series. However, preference is given to a solution in which the droplet separator unit has an upstream rod / tube separator and at least one downstream laminated-plate precipitator. The downstream droplet and the tube / Stababscheider can be formed V-shaped or roof-shaped with opposite slope to achieve an improved flushing of the separator through a purge / Bedüsungssystem provided.

In a further embodiment, the rod / tube separator may comprise a plurality of successively arranged rod / tube layers. In this case, the multiple rod / tube layers may be formed substantially identical. However, the rods / tubes of one layer can also be arranged offset to those of another layer. This results in no straight gas passage areas, but serpentine curved. Of course, these gas passage areas are formed by several rod / pipe layers according to the invention, d. H. different sized.

In a further development of the invention and in combination with the solution described in EP 1 601 442 Bl, the

Droplet separator unit, in addition to the features described above, at a distance from the outlet side of the unit, behind it, a means for reducing the flow velocity of the gas flow over a portion of the surface of the unit at that surface portion of the droplet separators. at In this embodiment, therefore, the solution according to the invention and the solution known from the aforementioned publication are combined with one another, so that a regulation of the flow velocity of the gas stream can be carried out both in the front region of the droplet separator unit and downstream thereof.

It goes without saying that the gas passage regions of the downstream device for reducing the flow velocity are also preferably of different sizes and adapted to the flow velocity distribution at the droplet separator. The device for reducing the flow velocity itself can also be formed as a plurality of passages exhibiting fabric or by a plurality of mutually parallel or intersecting rods, plates, tubes u. like. be formed.

Furthermore, the droplet separator unit designed according to the invention can have all the features listed in the aforementioned publication with regard to the downstream device for reducing the flow velocity. The disclosure of this publication is therefore incorporated by reference into the present disclosure, without any specific reference being made to each feature.

The invention further relates to a flue gas scrubber having a droplet separator unit of the type described above. The invention will be explained below with reference to an embodiment in conjunction with the drawings in detail. Show it:

Figure 1 shows a schematic vertical section through the gas flow channel of a flue gas scrubber;

Figure 2 is a graph showing the flow velocity distribution over the cross-section of the gas flow channel before and after the equalization;

Figure 3 is a schematic vertical section in a rotated by 90 ° with respect to Figure 1 view of the gas flow channel of Figure 1;

Figure 4 is a schematic perspective view of the rod / tube separator of Figures 1 and 3; and

FIG. 5 shows a vertical section through a tube of the rod / raw precipitator of FIG. 4 designed as a shell.

FIG. 1 shows, in a schematic vertical section, the gas flow channel 1 of a flue gas scrubber, which has a vertical section 10 and a lower horizontal section 11 and an upper horizontal section 12. The deflection between the vertical portion 10 and the upper horizontal portion 12 is designated 8, while the Deflection between the vertical portion 10 and the lower horizontal portion 11 is denoted by 9. The gas flow direction is indicated by corresponding arrows.

In the vertical section 10 of the gas flow channel 1 is a mist eliminator, which is designed as a rod / tube separator 2. The separator 2 has a plurality of tubes 7 which extend perpendicular to the image plane in FIG. Over the cross-section of the gas flow channel 1, the rod / tube separator 2 is subdivided into three regions, namely an inner region 4 (on the inner side of the deflections 8, 9), a central region 5 and an outer region 6. The tubes have in the respective regions 7 with the same pipe diameter different distances from each other, so that there are different gas passage areas for each area. In the inner region 4, the tubes 7 are arranged at a small distance from each other, while the distance in the central region 5 is greater. The largest is the distance in the outer region. 6

The gas flow channel 1 may be formed in this embodiment in horizontal section round or square or rectangular.

FIG. 2 shows in FIG. 2 a the flow velocity distribution over the cross section of the vertical section 10 of the gas flow channel 1. It can be seen that due to the lower deflection at 9, the flow velocity in the inner region of the vertical section 10 of the gas flow channel is greatest and decreases towards the outside , This is undesirable because one desires a uniform flow velocity distribution across the cross-section of the gas flow channel. By means of the droplet separator designed as a rod / tube separator 2 with different tube spacings, a homogenization of the flow velocity over the flow channel cross section is achieved, as shown in FIG. 2b. By means of the separator region 3 on the inside with the small tube intervals, the flow velocity peak present in this region is reduced. All three regions 4, 5 and 6 together produce the uniform flow velocity distribution shown schematically in FIG. 2b.

Downstream of the rod / tube separator 2 is a lamellar separator 3, which is flowed through the gas flow velocity uniformity over the cross section of the gas flow channel relatively uniformly, so that the second drop separator 3 (lamella separator) can operate optimally. By varying the pipe distances in the separator 2, the flow conditions in the separator 3 can be influenced so that desirable optimum conditions can be achieved.

FIG. 3 shows a vertical section through the gas flow channel 1 of FIG. 1 in a view rotated by 90 ° with respect to FIG. It can be seen that the rod / pipe separator 2 is V-shaped, wherein the individual tubes 7 are arranged inclined and meet at the lowest point in the middle of the channel. The second droplet separator 3 (lamellar separator) arranged downstream of the rod / tube separator 2 has a roof-shaped design, with entangled The rinsing water of a rinsing system (not shown) can therefore run outwards along the lamellae of the separator 3 and reaches the tubes 7 of the rod / tube separator 2, from where it is discharged centrally.

FIG. 4 shows a schematic three-dimensional view of the rod / tube separator 2 of FIGS. 1 and 3. The three regions 4, 5 and 6 shown in FIG. 1 can be seen, in which the tubes 7 are arranged at different distances.

The individual tubes 7 are not formed in the embodiment shown in the figures as solid tubes, but as open top shells, as shown in Figure 5 in cross-section. The flowing along the tubes 7 of the rod / pipe separator 2 from outside to inside water therefore runs in the shells to the center and is discharged from there via a suitable gutter system. By the flow of water within the shells of the rod / tube separator 2 is avoided that the gas flow entrains already deposited liquid particles or rinsing liquid and thus again acts on the downstream second droplet 3.

Claims

claims

1. Droplet separator unit for separating liquid particles from a gas stream for flue gas scrubbers and the like. Means with at least one arranged in a gas flow channel mist eliminator, which is designed as a rod or pipe separator, characterized in that to equalize the gas flow velocity over the gas flow channel cross section, the gas passage areas between the rods / tubes (7) of the rod / pipe separator (2) different are formed large and adapted to the gas flow velocity distribution in the gas flow channel (1).

2. droplet separator unit according to claim 1, characterized in that the gas passage areas at locations high gas flow velocity are small and formed at locations low gas flow velocity gro'ß.

3. Droplet separator unit according to claim 1 or 2, characterized in that the distances between the rods / tubes (7) of the rod / tube separator (2) are of different sizes.

4. Droplet separator unit according to one of the preceding claims, characterized in that the cross-sections of the rods / tubes of the rod / tube separator are of different sizes.

5. droplet separator unit according to one of the preceding claims, characterized in that the gas passage areas between the rods / tubes (7) of the rod / tube separator (2) in the inner region of a deflection (8, 9) of the gas flow channel (1) is small and large in the outer region are.

6. droplet separator unit according to claim 5, characterized in that the longitudinal axes of the rods / tubes (7) of the rod / tube separator (2) perpendicular to the gas flow direction in the horizontal part (11, 12) of the gas flow channel (1) are arranged.

7. Tropfenabcheidereinheit according to claim 5, characterized in that the longitudinal axes of the bars /

Tubes of the rod / pipe separator are arranged parallel to the gas flow direction in the horizontal part of the gas flow channel.

8. droplet separator unit according to one of the preceding claims, characterized in that the Rods / tubes (7) of the rod / Rohrabscheiders (2) are flat, inclined, roof-shaped or V-shaped.

9. Droplet separator unit according to one of the preceding claims, characterized in that the

Rods / tubes (7) are cup-shaped and serve to drain water.

10. Droplet separator unit according to one of the preceding claims, characterized in that the

Bar / pipe separator (2) has a plurality of rod / tube packages each having the same Gasdurchtrittsberei- che, but from package to package different gas passage areas.

11. Droplet separator unit according to one of the preceding claims, characterized in that it comprises at least one further, the rod / Rohrabscheider

(2) downstream of the droplet separator (3).

12. Droplet separator unit according to claim 11, characterized in that the downstream droplet separator (3) and the rod / pipe separator (2) are V-shaped or roof-shaped with opposite inclination.

13. Droplet separator unit according to one of the preceding claims, characterized in that the rod / pipe separator (2) comprises a plurality of successively arranged rod / pipe layers.

14. Droplet separator unit according to claim 13, characterized in that the rods / tubes of a layer are arranged offset to those of another layer.

A droplet separator unit according to any one of the preceding claims, characterized in that, downstream from the outlet side of the droplet separator unit, it has a device for reducing the flow rate of the gas flow over a partial section of the surface of the unit, at this surface portion of the droplet separator unit,

16. Droplet separator unit according to claim 15, characterized in that the gas passage regions of the device for reducing the flow velocity are of different sizes and adapted to the flow velocity distribution at the droplet separator unit.

17. Droplet separator unit according to claim 15 or 16, characterized in that the device for reducing the flow velocity is designed as a plurality of passages exhibiting fabric.

18. Droplet separator unit according to claim 15 or 16, characterized in that the device is arranged by a plurality of mutually parallel or intersecting bars, plates, tubes and similar like. is formed.

19. flue gas scrubber, characterized in that it comprises a Tropfenabscheidereinheit according to one of the preceding claims.