Rotary separator for separating particles from a gas flow

Abstract

Rotary separator (10) for separating liquid and / or solid particles from a gas flow, with - a separator housing (12); and - a separator rotor (14) arranged in the separator housing (12) and rotatably driven, which is permeable to the gas flow for particle separation and separates a raw gas side (24) of the rotary separator (10) from a clean gas side (26) of the rotary separator (10); characterized by a separation structure (30) arranged between the separator rotor (14) and a housing wall (40) of the separator housing (12), which separates a clean gas flow area (32) on the clean gas side (26) of the rotary separator (10) from a particle removal area (34) on the clean gas side (26) of the rotary separator (10) at least sectionally.

Description

[0001] The invention relates to a rotary separator for separating liquid and / or solid particles from a gas flow, comprising a separator housing and a separator rotor arranged in the separator housing and rotatably drivable, through which the gas flow for particle separation can flow and which separates a raw gas side of the rotary separator from a clean gas side of the rotary separator.

[0002] In conventional rotary separators, particles are typically thrown from the separator rotor onto a peripheral wall of the separator housing and from there directed toward the particle outlet. The clean gas outlet of the rotary separator is usually located on the opposite side of the particle outlet, so that the particles that have already been separated and are to be directed toward the particle outlet can be captured by the clean gas flow and entrained toward the clean gas outlet.

[0003] Due to the rotation of the separator rotor, the gas flow on the clean side is imparted not only with an axial flow component toward the clean gas outlet, but also with a flow component in the direction of rotor rotation. In this context, the document DE 10 2011 009 741 A1 proposes equipping the peripheral wall of the separator housing with particle guide chutes so that the particles thrown onto the peripheral wall of the separator housing are driven into the particle guide chutes by the flow component of the clean gas in the direction of rotor rotation. The particles can then be guided via the particle guide chutes toward the particle outlet.

[0004] However, both the particles that have already reached the particle guide chutes and the particles on their way towards a particle guide chute are still exposed to the flow influence of the clean gas flow in the direction of the clean gas outlet, so that particles that have already been separated by the separation rotor continue to be re-entered into the clean gas flow on the clean side of the rotary separator.

[0005] The object underlying the invention is therefore to reduce or prevent the re-entry of particles already separated by the separation rotor into the clean gas flow on the clean gas side of a rotary separator.

[0006] The object is achieved by a rotary separator of the type mentioned at the outset, wherein the rotary separator according to the invention has a separating structure arranged between the separating rotor and a housing wall of the separator housing, which separates a clean gas flow region on the clean side of the rotary separator from a particle discharge region on the clean side of the rotary separator at least in sections.

[0007] The rotary separator preferably comprises a particle outlet for the particles separated from the gas flow by the separation rotor. The purified gas is discharged via the clean gas flow area between the separation rotor and the separation structure toward the clean gas outlet. The separated particles are discharged via the particle discharge area between the separation structure and the housing wall of the separator housing toward the particle outlet. The separation structure protects the particles in the particle discharge area from the flow influences of the gas flow in the clean gas flow area. The flow influences of the gas flow in the clean gas flow area on the particles in the particle discharge area are reduced by the separation structure or can be completely avoided locally.As a result, fewer or no particles are entrained by the clean gas flow towards the clean gas outlet on the clean gas side, further reducing the particle loading of the gas flow leaving the rotary separator.

[0008] The clean gas flow area is preferably directly adjacent to the clean gas outlet of the rotary separator, through which the clean gas flow is discharged from the separation rotor. The particle discharge area is preferably connected to the particle outlet of the rotary separator. The rotary separator preferably has a raw gas inlet on the raw side, through which the particle-laden gas flow can be introduced into the separator housing of the rotary separator.

[0009] The rotary separator preferably has a drive that can be used to drive the separator rotor. The drive can be an electric motor, for example. Alternatively, the drive can also be a pneumatic or hydraulic drive.

[0010] In a preferred embodiment of the rotary separator according to the invention, the separation structure extends at least partially around the separation rotor. The separation structure preferably extends over a circumferential angular range of at least 180 degrees, preferably over a circumferential angular range of at least 270 degrees. The separation structure is preferably fixed, i.e., immovably, arranged in the separator housing. In other embodiments, the separation structure can also be arranged movably in the separator housing; for example, the separation structure can be rotatable, in particular opposite to the direction of rotation of the separation rotor.

[0011] In a further preferred embodiment of the rotary separator according to the invention, the clean gas flow region is arranged radially inward of the particle discharge region. Consequently, the particle discharge region is arranged radially outward of the clean gas flow region. The clean gas flowing out of the separation rotor therefore initially flows into the clean gas flow region. A portion of the clean gas flow can also reach the particle discharge region, which is arranged radially outward of the clean gas flow region. The particles ejected by the separation rotor are preferably first ejected into the clean gas flow region, with the particles ejected into the clean gas flow region then flowing toward the particle discharge region.

[0012] In another preferred embodiment of the rotary separator according to the invention, the clean gas flow region has an annular cross-section. Alternatively or additionally, the particle discharge region has an annular cross-section. The annular flow channel of the clean gas flow region is preferably wider than the annular particle discharge region. The clean gas flow region preferably has at least twice the volume of the particle discharge region.

[0013] The rotary separator according to the invention is further advantageously developed in that the separation structure has one or more impact surfaces for intercepting particles thrown off by the separation rotor. The impact surfaces of the separation structure preferably face the clean gas flow region. Thus, the particles thrown off by the separation rotor first pass through the clean gas flow region and then strike an impact surface of the separation structure. The particles are then guided by the one or more impact surfaces toward the particle removal region. The separator housing preferably has a particle removal surface in the particle removal region, along which at least some of the particles separated from the gas flow by the separation rotor can be removed toward the particle outlet.The particles thrown off by the separation rotor and impacting the one or more impact surfaces thus pass from the one or more impact surfaces to the particle removal surface, via which the particles are removed toward the particle outlet. The particle removal surface preferably represents an outer boundary of the particle removal area and can have one or more particle removal chutes. The particle removal can be accelerated via the one or more particle removal chutes.

[0014] The rotary separator according to the invention is further advantageously developed in that the one or more impact surfaces extend in the circumferential direction along an annular, in particular an annular, path. Alternatively, the radial distance between the outer contour of the separation rotor and the one or more impact surfaces changes in the circumferential direction. The radial distance between the outer contour of the separation rotor and the one or more impact surfaces preferably increases in the direction of rotation of the separation rotor. The one or more impact surfaces preferably run, at least in sections, non-tangentially to the axis of rotation of the separation rotor.

[0015] In another preferred embodiment of the separation rotor according to the invention, the clean gas flow region and the particle removal region are pneumatically connected to one another via one or more flow passages. The flow passages can partially interrupt an impact surface of the separation structure or can be arranged between several, for example two, impact surfaces of the separation structure. The flow passages can be elongated, in particular slot-shaped. The flow passages can extend in the axial direction. The direction of extension of the flow passages can comprise not only an axial component but also a circumferential component, so that the flow passages extend helically along an impact surface or between several impact surfaces. The flow passages can extend over at least 25%, preferably at least 50%, particularly preferably at least 75% of the axial height of the gas outlet region of the separation rotor.Multiple flow passages can be evenly or unevenly distributed over the circumference.

[0016] The rotary separator according to the invention is further advantageously developed in that the one or more flow passages are formed by recesses or openings in the separation structure. The recesses or openings can be holes, bores, punched sections, or the like. The particles on the one or more impact surfaces can pass from the clean gas flow area into the particle removal area via the one or more recesses or openings.

[0017] A rotary separator according to the invention is further advantageous in which the separation structure comprises one or more separation edges for separating the particles to be guided into the particle removal region from a portion of the gas flow remaining in the clean gas flow region on the clean side. The particles thrown off by the separation rotor can form a particle film on the one or more impact surfaces. The particle film is separated via the one or more separation edges and guided into the particle removal region. The one or more separation edges can run in the axial direction. The direction of extension of the one or more separation edges can have a circumferential component in addition to an axial component, so that the one or more separation edges can also extend helically along the separation structure.If the particles are oil particles, the oil particles can form an oil film on the one or more impact surfaces. In this case, the separation structure acts as an oil scraper, separating the oil film from the one or more impact surfaces and directing it into the particle removal area.

[0018] In another preferred embodiment of the rotary separator according to the invention, the one or more separating edges border the flow passages. Alternatively or additionally, the one or more separating edges form contour edges of the flow passages. Because the one or more separating edges border the flow passages and / or form contour edges of the flow passages, the particles detached from the one or more impact surfaces are guided directly and immediately into the particle removal area, so there is no risk of the particles detached from the one or more impact surfaces remaining in the clean gas flow area.

[0019] In a particularly preferred embodiment of the rotary separator according to the invention, the separation structure is formed by a sleeve. The sleeve can be a gas-conducting sleeve. If the particles are oil particles, the sleeve can be a gas-conducting sleeve with an oil scraper. The sleeve can have an annular cross-section. The sleeve can be arranged coaxially to the separator rotor. The sleeve can be partially or completely cylindrical, conically tapered, or conically widened. At the end facing the clean gas outlet, the sleeve can have a collar that closes or narrows a gap between the particle removal surface and an outlet flow region for the clean gas.

[0020] In a further preferred embodiment of the rotary separator according to the invention, the separation structure is formed by several spaced-apart separating bodies. The flow passages through which the particles can pass from the clean gas flow area to the particle removal area are preferably located between the separating bodies. The separating bodies can each have an impact surface for the particles thrown off by the separator rotor. To avoid turbulence, the separating bodies can extend over a circumferential angular range of at least 10 degrees.

[0021] In another preferred embodiment of the rotary separator according to the invention, one or more stabilizing elements extend through the particle discharge region. The one or more stabilizing elements can be connected to the separation structure and / or to the housing wall of the separator housing. The stabilizing elements preferably extend in the radial direction and / or in the axial direction. The stabilizing elements can divide the particle discharge region into several ring segments in certain regions. The stabilizing elements can be, for example, webs or ribs and provide additional stability to the separation structure and / or the separator housing. Furthermore, the stabilizing elements can prevent strong turbulence in the particle discharge region. If the separation structure is formed by a sleeve, the stabilizing elements can be connected to the sleeve and / or to the housing wall of the separator housing.

[0022] The rotary separator according to the invention can be a disc separator. The separator rotor of the disc separator can comprise a disc stack with several separating discs arranged one above the other for separating the particles from the gas flow flowing through the separator rotor.

[0023] The rotary separator can also be designed as a fiber separator. The separation rotor of the fiber separator can comprise fiber material for separating the particles from the gas flow flowing through the separation rotor.

[0024] Preferred embodiments of the invention are explained and described in more detail below with reference to the accompanying drawings. Fig. 1 shows a rotary separator according to the invention in a schematic side sectional view; Fig. 2 shows a further rotary separator according to the invention in a schematic sectional view from above; Fig. 3 shows another rotary separator according to the invention in a schematic sectional view from above; Fig. 4 shows a further rotary separator according to the invention in a schematic sectional view from above; Fig. 5 shows a further rotary separator according to the invention in a schematic sectional view from above; Fig. 6 shows a separation structure of a rotary separator according to the invention in a perspective sectional view; Fig. 7 shows a separating structure of another rotary separator according to the invention in a schematic perspective view; and Fig. 8 a separation structure of another rotary separator according to the invention in a schematic perspective view.

[0025] The Fig. 1 shows a rotary separator 10 designed as a disc separator. The rotary separator 10 serves to separate liquid particles, namely oil particles, from a gas flow.

[0026] A separator housing 12 of the rotary separator 10 contains a rotating, drivable separator rotor 14. The separator rotor 14 comprises a plate stack 16 with a plurality of separator plates 18 arranged one above the other.

[0027] The separating rotor 14 is driven in rotation by a drive 20 designed as an electric motor.

[0028] The separator housing 12 has a raw gas inlet 22, through which a gas flow with a high particle load flows into the separator housing 12. The gas flow first reaches the raw gas side 24 of the rotary separator 10 before flowing through the separation rotor 14. The separation rotor 14 separates the raw gas side 24 of the rotary separator 10 from a clean gas side 26 of the rotary separator 10. After the particles have been separated by the separation rotor 14, the gas flow consequently reaches the clean gas side 26 of the rotary separator 10 and can be discharged from the separator housing 12 via the clean gas outlet 28.

[0029] The rotary separator 10 comprises a separation structure 30 which separates a clean gas flow region 32 from a particle discharge region 34 on the clean gas side 26 of the rotary separator 10.

[0030] The particles ejected by the rotating separation rotor 14 first pass through the clean gas flow area 32 and then strike an impact surface 36 of the separation structure 30. The particles ejected by the separation rotor 14 and impacting the impact surface 36 then reach the particle removal area 34 via the flow passages 38 in the separation structure 30. The separator housing 12 has a housing wall 40. The particles introduced into the particle removal area 34 initially impact the housing wall 40, from where they are guided under the influence of gravity toward a particle outlet of the separator housing 12. The particle outlet for the particles separated from the gas flow by the separation rotor 14 is located in a lower region of the separator housing 12, i.e., on the opposite side of the clean gas outlet 28.

[0031] In the illustrated rotary separator 10, the purified gas is thus discharged via the clean gas flow area 32 between the separation rotor 14 and the separation structure 30 toward the clean gas outlet 28. The separated particles are discharged via the particle discharge area 34 between the separation structure 30 and the housing wall 40 of the separator housing 12 toward the particle outlet. The separation structure 30 protects the particles in the particle discharge area 34 from the flow influences of the gas flow in the clean gas flow area 32. The flow influences of the gas flow in the clean gas flow area 32 on the particles in the particle discharge area 34 are reduced by the separation structure 30 or can be completely avoided locally. The particles are therefore less strongly entrained by the clean gas flow in the direction of the clean gas outlet 28, so that a reduced particle loading of the gas flow leaving the rotary separator 10 is achieved.

[0032] For those in the Fig. In the rotary separators 10 shown in Figures 2 to 5, the separation structure 30 rotates around the separation rotor 14. The separation structure 30 is fixedly or immovably arranged in the separator housing 12. The clean gas flow region 32 is arranged radially inward of the particle removal region 34. The clean gas flow region 32 has an annular cross-section. Furthermore, the particle removal region 34 has an annular cross-section.

[0033] In the Fig. In the embodiment shown in Figure 2, the separation structure 30 is designed as a sleeve. The separation structure 30, designed as a sleeve, comprises a plurality of structural segments 42a-42d. The individual structural segments 42a-42d each carry an impact surface 36a-36d facing the separation rotor 14 for intercepting the particles thrown off by the separation rotor 14. The radial distance between the outer contour of the separation rotor 14 and the impact surfaces 36a-36d changes in the circumferential direction. The radial distance between the outer contour of the separation rotor 14 and the impact surfaces 36a-36d increases in the direction of rotation DR of the separation rotor 14.

[0034] The flow passages 38 that pneumatically connect the clean gas flow area 32 to the particle removal area 34 are located between the structural segments 32a-32d and between the impact surfaces 36a-36d, respectively. The flow passages 38 are formed by openings in the separating structure 30.

[0035] The separation structure 30 has a plurality of separation edges 44a-44d for separating the particles to be guided into the particle removal area 34 from a portion of the gas flow remaining in the clean gas flow area 32 on the clean side 26. When the particles form a particle film on the impact surfaces 36a-36d, the particle film is broken up in the manner of a plane in the area of ​​the passages 38 and introduced into the particle removal area 34. The separation edges 44a-44d border the flow passages 38 and form contour edges of the flow passages 38.

[0036] In the Fig. In the embodiment shown in Figure 3, the separating structure 30 is formed by a slotted sleeve. The slot in the sleeve serves as a flow passage 38. The impact surface 36 extends circumferentially along a circular path. The separating edge 44 is part of an inwardly directed bevel in the region of the flow passage 38.

[0037] In the Fig. In the embodiment shown in Figure 4, the separation structure 30 is formed by a plurality of spaced-apart separating bodies 46a-46c. The flow passages 38 are located between the separating bodies 46a-46c. The separating bodies 46a-46c of the separation structure 30 are connected to the housing wall 40 of the separator housing 12 via stabilizing elements 50a-50c. The stabilizing elements 50a-50c extend through the particle removal area 34 and divide it into three ring segments. The stabilizing elements 50a-50c can be, for example, webs or ribs and provide the separation structure 30 with additional stability. In addition, the stabilizing elements 50a-50c prevent stronger turbulence in the particle discharge area 34. If the separation structure 30 is formed by a sleeve, the stabilizing elements 50a-50c can be connected to the sleeve and / or to the housing wall 40 of the separator housing 12.One or more stabilizing elements 50a-50c may be present.

[0038] The Fig. Figure 5 shows a rotary separator 10 in which the separation structure 30 has no radially inwardly directed sections. Therefore, there are no separating edges that promote a planing effect in the transition area between the clean gas flow area 32 and the particle removal area 34.

[0039] The Fig. 6 shows a one-piece variant of a separation structure 30, wherein the separation structure 30 comprises a circumferential collar 48 on one side. The collar 48 can be used to close or narrow the gap between the particle removal surface on the housing wall 40 and an outlet flow area for the clean gas.

[0040] The Fig. Figure 7 shows a sleeve-shaped separating structure 30, wherein the flow passage 38 is formed as an elongated recess. The flow passage 38, formed as an elongated recess, extends in the axial direction, so that, when the separating structure 30 is installed, it runs parallel to the rotational axis of the separator rotor 14.

[0041] In the Fig. In the separating structure 30 shown in Fig. 8, the direction of extension of the flow passage 38 has not only an axial component but also a circumferential component, so that the flow passage 38 extends helically along the sleeve shell. Reference symbol 10 rotary separators 12 separator housings 14 Separator rotor 16 plate package 18 separator plates 20 drive 22 Raw gas inlet 24 Raw gas side 26 Clean gas side 28 Clean gas outlet 30 Separation structure 32 Clean gas flow area 34 Particle removal area 36, 36a-36d Impact surfaces 38 flow passages 40 Housing wall 42a-42d structural segments 44, 44a-44d Separating edges 46a-46c separator 48 collars 50a-50c Stabilizing elements DR direction of rotation QUOTES CONTAINED IN THE DESCRIPTION

[0000] This list of documents submitted by the applicant was generated automatically and is included solely for the convenience of the reader. This list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2011 009 741 A1

[0003]

Claims

[1] Rotary separator (10) for separating liquid and / or solid particles from a gas flow, with - a separator housing (12); and - a separator rotor (14) arranged in the separator housing (12) and rotatably driven, through which the gas flow for particle separation can flow and which separates a raw gas side (24) of the rotary separator (10) from a clean gas side (26) of the rotary separator (10); characterized by a separating structure (30) arranged between the separating rotor (14) and a housing wall (40) of the separator housing (12), which separates a clean gas flow region (32) on the clean gas side (26) of the rotary separator (10) from a particle removal region (34) on the clean gas side (26) of the rotary separator (10) at least in sections. [2] Rotary separator (10) according to claim 1, characterized by that the separation structure (30) rotates at least partially around the separation rotor (14). [3] Rotary separator (10) according to claim 1 or 2, characterized by that the clean gas flow area (32) is arranged radially inward of the particle discharge area (34). [4] Rotary separator (10) according to one of the preceding claims, characterized by , that - the clean gas flow region (32) has an annular cross-section; and / or - the particle discharge area (34) has an annular cross-section. [5] Rotary separator (10) according to one of the preceding claims, characterized by that the separation structure (30) has one or more impact surfaces (36, 36a-36d) for intercepting particles thrown off by the separation rotor (14). [6] Rotary separator (10) according to claim 5, characterized by , that - the one or more impact surfaces (36, 36a-36d) extend in the circumferential direction along an annular, in particular a circular, path, or - the radial distance between the outer contour of the separator rotor (14) and the one or more impact surfaces (36, 36a-36d) changes in the circumferential direction. [7] Rotary separator (10) according to one of the preceding claims, characterized by that the clean gas flow area (32) and the particle removal area (34) are pneumatically connected to one another via one or more flow passages (38). [8] Rotary separator (10) according to claim 7, characterized by that the one or more flow passages (38) are formed by recesses or clearances in the separating structure (30). [9] Rotary separator (10) according to one of the preceding claims, characterized by in that the separating structure (30) comprises one or more separating edges (44, 44a-44d) for separating the particles to be guided into the particle discharge region (34) from a part of the gas flow on the clean gas side (26) remaining in the clean gas flow region (32). [10] Rotary separator (10) according to claim 9, characterized by that the one or more separating edges (44, 44a-44d) adjoin the flow passages (38) and / or form contour edges of the flow passages (38). [11] Rotary separator (10) according to one of the preceding claims, characterized by that the separating structure (30) is formed by a sleeve. [12] Rotary separator (10) according to one of the preceding claims, characterized by that the separating structure (30) is formed by a plurality of spaced-apart separating bodies (46a-46c). [13] Rotary separator (10) according to one of the preceding claims, characterized by that the rotary separator (10) - is designed as a disc separator and the separating rotor (14) comprises a disc pack (16) with several separating discs (18) arranged one above the other for separating the particles from the gas flow flowing through the separating rotor (14); or - is designed as a fiber separator and the separating rotor (14) comprises fiber material for separating the particles from the gas flow flowing through the separating rotor (14).

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