EP2274105A1 - Methods for cleaning a rotor of a centrifugal separator, and gas separation plants having such cleanable centrifugal separators - Google Patents

Methods for cleaning a rotor of a centrifugal separator, and gas separation plants having such cleanable centrifugal separators

Info

Publication number
EP2274105A1
EP2274105A1 EP09730746A EP09730746A EP2274105A1 EP 2274105 A1 EP2274105 A1 EP 2274105A1 EP 09730746 A EP09730746 A EP 09730746A EP 09730746 A EP09730746 A EP 09730746A EP 2274105 A1 EP2274105 A1 EP 2274105A1
Authority
EP
European Patent Office
Prior art keywords
gas
rotor
separator
centrifugal
cleaning
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09730746A
Other languages
German (de)
French (fr)
Other versions
EP2274105A4 (en
EP2274105B1 (en
Inventor
Claes Inge
Peter Franzén
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Grimaldi Development AB
Original Assignee
3Nine AB
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 3Nine AB filed Critical 3Nine AB
Publication of EP2274105A1 publication Critical patent/EP2274105A1/en
Publication of EP2274105A4 publication Critical patent/EP2274105A4/en
Application granted granted Critical
Publication of EP2274105B1 publication Critical patent/EP2274105B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/10—Centrifuges combined with other apparatus, e.g. electrostatic separators; Sets or systems of several centrifuges
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B15/00—Other accessories for centrifuges
    • B04B15/06—Other accessories for centrifuges for cleaning bowls, filters, sieves, inserts, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/08—Centrifuges for separating predominantly gaseous mixtures
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/12—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B04—CENTRIFUGAL APPARATUS OR MACHINES FOR CARRYING-OUT PHYSICAL OR CHEMICAL PROCESSES
    • B04B—CENTRIFUGES
    • B04B5/00—Other centrifuges
    • B04B5/12—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers
    • B04B2005/125—Centrifuges in which rotors other than bowls generate centrifugal effects in stationary containers the rotors comprising separating walls

Definitions

  • the present invention relates to a method for cleaning a rotor of a centrifugal separator in a gas separation plant having at least two centrifugal separators, coupled in parallel and functioning by counter-current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet coupled to a common gas feed for contaminated gas, and a gas outlet coupled to a gas outlet line for scrubbed gas, and having a fan in the outlet line in order to draw contaminated gas into both of the centrifugal separators together during gas scrubbing operation, and to extract scrubbed gas from these via the outlet line.
  • the invention further relates to a method for cleaning a rotor of a centrifugal separator in a gas separation plant having at least two centrifugal separators, coupled in parallel and functioning by co-current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet coupled to a gas feed for contaminated gas, and a gas outlet coupled to a gas outlet line for scrubbed gas.
  • the invention further relates to a gas separation plant for separating liquid particles and/or solid particles from a contaminated gas, comprising at least two centrifugal separators, coupled in parallel and functioning by counter- current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet coupled to a common gas feed for contaminated gas, a gas outlet coupled to a gas outlet line for scrubbed gas, and a fan in the outlet line in order to draw contaminated gas into the centrifugal separators during normal gas scrubbing operation, and to extract scrubbed gas from these via the outlet line.
  • the invention likewise relates to a gas separation plant for separating liquid particles and/or solid particles from a contaminated gas, comprising at least two centrifugal separators, coupled in parallel and functioning by co-current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet for contaminated gas, and a gas outlet coupled to a gas outlet line for scrubbed gas.
  • centrifugal separators In plants for scrubbing flue gas from thermal power stations, for example, multiple centrifugal separators, known in the art and coupled in parallel, may be used, which separate liquid particles (normally water) and solid particles (normally soot) from the contaminated gas before scrubbed gas is released into the surrounding atmosphere.
  • centrifugal separators In operation of the centrifugal separators their sedimentation surface elements, normally in the form of conical rotor disk elements, become fouled with adhering particles, which clog the narrow gaps between the disks, so that the disks need to be cleaned at intervals. To do this, it has hitherto been necessary to shut down all or parts of the plant and to clean the separators separately, entailing an additional time-consuming operation.
  • An object of the present invention is to propose a method for cleaning a rotor of a centrifugal separator in a gas separation plant having at least two centrifugal separators, coupled in parallel and functioning by counter-current separation, in which cleaning of the separators can be performed more rapidly and efficiently than hitherto.
  • the method according to the invention is characterized by the features specified in Claim 1, the outlet line from one of the separators to be cleaned therefore being shut off, whilst an air inlet into the gas outlet of the separator upstream of the shut-off in the outlet line is simultaneously opened, the air from the air inlet being made to flow through the rotor of this separator in a direction of flow opposed to the normal gas flow direction through the separator, and thereafter into the gas inlet of the other, active centrifugal separator.
  • the temporarily counter-current air flow causes the contaminants adhering to the rotating rotor disk elements to be dried and thereby released more easily from these elements.
  • the cleaning process can be further facilitated and rendered more efficient by reducing the rotational speed of the rotor during the cleaning phase, to such a degree that vibrations naturally occurring in the rotor are used to shake loose the contaminants deposited on the sedimentation surface elements of the rotor.
  • Yet another object of the present invention is to propose a gas separation plant which comprises such cleanable centrifugal separators and functioning by counter-current separation for separating liquid particles and solid particles from a contaminated gas.
  • the gas separation plant according to one embodiment of the invention is more specifically characterized by the features of the independent Claim 6. An embodiment designed in this way allows the constituent separators of the gas separation plant to be alternately cleaned efficiently and rapidly during a continuous gas scrubbing process.
  • Fig. 1 is a schematic side view of a gas separation plant according to the invention having two centrifugal separators, coupled in parallel and functioning by counter-current separation, in a gas-scrubbing operating state;
  • Fig. 2 is a schematic side view of the gas separation plant in Fig. 1 during cleaning of the rotor of the one centrifugal separator on the left of the drawing;
  • Fig. 3 is a schematic side view of a gas separation plant according to the invention having two centrifugal separators, coupled in parallel and functioning by co-current separation, in a gas-scrubbing operating state; and
  • Fig. 4 is a schematic side view of the gas separation plant in Fig. 3 during cleaning of the rotor of the one centrifugal separator on the left of the drawing.
  • a gas separation plant for separating liquid particles and solid particles from a contaminated gas such as a water-cooled flue gas from a thermal power station, for example, is generally denoted by 10.
  • the gas separation plant 10 comprises two (or more) centrifugal separators 12, coupled in parallel and of a type known in the art, each of which has a fixed housing 14 and a schematically indicated rotor 16 rotatably supported therein, each having a large number of preferably conical disk elements stacked with intervening spaces between them.
  • the separators 12 have a common feed 18 for the contaminated gas that is to be scrubbed, and each has a gas inlet 20 in a side wall of the housing 14.
  • An outlet 22 for the gas scrubbed in the separator 12 is arranged on top of each housing 14, and a gas outlet line 24 extends from the outlet 22 towards a common gas outlet 26, in which a fan 28 is fitted, which in normal operation draws the contaminated gas through both (all) of the centrifugal separators 12 from the common feed 18.
  • the separator housings 14 have bottom outlets (not shown) for solid and liquid phases, which have been separated out by the rotor disk elements.
  • a rotatable damper 30 Situated in each of the respective gas outlet lines 24 is a rotatable damper 30, which in normal gas scrubbing operation can be kept open in order to allow a common intake of contaminated gas into the separators 12 and a common extraction of scrubbed gas therefrom. Also situated upstream of the dampers 30 in each of the outlet lines 24 is a fresh air inlet 34 that can be either opened or closed by a valve 32, said valve 32 being kept closed during normal gas scrubbing operation.
  • the disk elements of the rotors 16 can easily and rapidly be cleaned of these contaminants in that the damper 30 in the one gas outlet line 24, in Fig. 2 the left-hand line, is closed and the associated air inlet valve 32 is simultaneously opened, fresh air being made to flow through the rotor 16 in a direction counter to the normal direction of flow of the gas, first drying, then "tearing off the contaminants with the aid of the gas inlet 20 of the other, in Fig. 2 the right-hand, still active separator 12, which is connected to the inlet 20 of the left-hand separator 12, which is being cleaned and which is under the continuous suction effect of the fan 28.
  • the process can be switched over and the outlet line 24 of the right-hand separator 12 can then be closed and the fresh air inlet 34 opened in order to clean the right-hand separator 12 in a corresponding manner.
  • the contaminated gas is led via the feed 18 into the centre of the rotor 16 via a respective inlet 20a of each separator 12, following which it flows radially out through the rotor 16, where the contaminants are separated out, and then out through the gas outlet line 24 and a common gas outlet 26.
  • the disk elements of the rotor 16 When after a period of use the disk elements of the rotor 16 have become fouled by adhering solid and/or liquid particles from the contaminated gas, the disk elements of the rotors 16 can easily and rapidly be alternately cleaned of these contaminants in that the damper 30 in the one gas outlet line 24, in Fig.
  • a valve 35 closes the inlet 20a, fresh air from the air inlet 34 being made to flow through the rotor 16 in the same direction as the normal direction of flow of the gas, first drying, then "tearing off the contaminants with the aid of the other, in Fig. 4 the right- hand, still active separator 12, which is connected via its inlet 20a to the outlet 22 of the left-hand separator 12 via an open return line 36.
  • a valve 38 keeps the return line 36 closed, as shown in Fig. 3.
  • the process can be switched over in order to activate the left-hand separator 12, and the outlet line 24 of the right-hand separator 12 can then be closed by the damper 30 and the fresh air inlet 34 opened, whilst the associated gas inlet valve 35 is simultaneously closed and the valve 38 of the return line 36 is opened in order to clean the right-hand separator 12 in a corresponding manner.
  • the rotational speed of the rotor 16 may be reduced during the cleaning phase to such a degree that vibrations naturally occurring in the rotor are used in order to shake loose the contaminants deposited on the disk elements of the rotor.
  • a cleaning liquid may be added, in a manner known in the art, to the air flow from the fresh air inlet 34 during the cleaning phase of the rotor
  • centrifugal separators are used having a rotor with radial, conical separating disks. It is naturally also feasible to use centrifugal separators, the rotors of which have axial disk elements which are involute in plan view.
  • the flushing air always flows co-currently through the rotor, so as not to counteract the separation of the contaminants attached to and then released from the disk elements of the rotor. This applies to all embodiments according to the invention.

Abstract

Method and arrangement for cleaning a rotor (16) of a centrifugal separator (12) in a gas separation plant having at least two centrifugal separators, coupled in parallel and functioning by counter-current or co-current separation. For the purpose of alternately cleaning rotors (16) of the centrifugal separators (12), agas outlet line (24) from the one separator is shut off and an air inlet (34) in its gas outlet (22) upstream of the shut-off in the outlet line (24) is opened, the air from the air inlet (34) being made to flow through the rotor in the separator that is to be cleaned by means of the pumping action of the centrifugal separator itself and possible suction force from a common fan (28) via the gas inlet (20) of the other, active centrifugal separator.

Description

Methods for cleaning a rotor of a centrifugal separator, and gas separation plants having such cleanable centrifugal separators
BACKGROUND ART
The present invention relates to a method for cleaning a rotor of a centrifugal separator in a gas separation plant having at least two centrifugal separators, coupled in parallel and functioning by counter-current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet coupled to a common gas feed for contaminated gas, and a gas outlet coupled to a gas outlet line for scrubbed gas, and having a fan in the outlet line in order to draw contaminated gas into both of the centrifugal separators together during gas scrubbing operation, and to extract scrubbed gas from these via the outlet line.
The invention further relates to a method for cleaning a rotor of a centrifugal separator in a gas separation plant having at least two centrifugal separators, coupled in parallel and functioning by co-current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet coupled to a gas feed for contaminated gas, and a gas outlet coupled to a gas outlet line for scrubbed gas.
The invention further relates to a gas separation plant for separating liquid particles and/or solid particles from a contaminated gas, comprising at least two centrifugal separators, coupled in parallel and functioning by counter- current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet coupled to a common gas feed for contaminated gas, a gas outlet coupled to a gas outlet line for scrubbed gas, and a fan in the outlet line in order to draw contaminated gas into the centrifugal separators during normal gas scrubbing operation, and to extract scrubbed gas from these via the outlet line.
The invention likewise relates to a gas separation plant for separating liquid particles and/or solid particles from a contaminated gas, comprising at least two centrifugal separators, coupled in parallel and functioning by co-current separation, in which each centrifugal separator has a housing with a rotatably supported rotor with sedimentation surface elements, a gas inlet for contaminated gas, and a gas outlet coupled to a gas outlet line for scrubbed gas.
In plants for scrubbing flue gas from thermal power stations, for example, multiple centrifugal separators, known in the art and coupled in parallel, may be used, which separate liquid particles (normally water) and solid particles (normally soot) from the contaminated gas before scrubbed gas is released into the surrounding atmosphere. In operation of the centrifugal separators their sedimentation surface elements, normally in the form of conical rotor disk elements, become fouled with adhering particles, which clog the narrow gaps between the disks, so that the disks need to be cleaned at intervals. To do this, it has hitherto been necessary to shut down all or parts of the plant and to clean the separators separately, entailing an additional time-consuming operation.
SUMMARY OF THE INVENTION
An object of the present invention is to propose a method for cleaning a rotor of a centrifugal separator in a gas separation plant having at least two centrifugal separators, coupled in parallel and functioning by counter-current separation, in which cleaning of the separators can be performed more rapidly and efficiently than hitherto. To achieve this object, the method according to the invention is characterized by the features specified in Claim 1, the outlet line from one of the separators to be cleaned therefore being shut off, whilst an air inlet into the gas outlet of the separator upstream of the shut-off in the outlet line is simultaneously opened, the air from the air inlet being made to flow through the rotor of this separator in a direction of flow opposed to the normal gas flow direction through the separator, and thereafter into the gas inlet of the other, active centrifugal separator. The temporarily counter-current air flow causes the contaminants adhering to the rotating rotor disk elements to be dried and thereby released more easily from these elements.
In an alternative method for cleaning the rotor of centrifugal separators functioning by co-current separation the outlet line from the one separator is shut off and an air inlet upstream of the rotor of the separator is opened, so that air from the air inlet is made to flow from the inside outwards through the rotor to be cleaned in the same direction of flow as the normal gas flow direction through the rotor and thereafter into the gas inlet of the other, active centrifugal separator.
The cleaning process can be further facilitated and rendered more efficient by reducing the rotational speed of the rotor during the cleaning phase, to such a degree that vibrations naturally occurring in the rotor are used to shake loose the contaminants deposited on the sedimentation surface elements of the rotor.
It may also be appropriate to add a cleaning liquid to the air flow from the air inlet during the cleaning phase of the rotor of the separator. The methods above are particularly suited to cleaning the rotors of centrifugal separators for scrubbing flue gases. Yet another object of the present invention is to propose a gas separation plant which comprises such cleanable centrifugal separators and functioning by counter-current separation for separating liquid particles and solid particles from a contaminated gas. The gas separation plant according to one embodiment of the invention is more specifically characterized by the features of the independent Claim 6. An embodiment designed in this way allows the constituent separators of the gas separation plant to be alternately cleaned efficiently and rapidly during a continuous gas scrubbing process.
In order to facilitate and to make the cleaning of the normally conical rotor disk elements of the centrifugal separator more efficient, it is appropriate, in the case of counter-current separation, to arrange a cleaning liquid injection nozzle upstream of the rotor of the centrifugal separator in the direction of the air flow.
Further features and advantages of the methods and the plants according to the invention are specified in the following patent claims and are described in more detail below with reference to the drawings attached.
BRIEF DESCRIPTION OF DRAWINGS
Fig. 1 is a schematic side view of a gas separation plant according to the invention having two centrifugal separators, coupled in parallel and functioning by counter-current separation, in a gas-scrubbing operating state;
Fig. 2 is a schematic side view of the gas separation plant in Fig. 1 during cleaning of the rotor of the one centrifugal separator on the left of the drawing; Fig. 3 is a schematic side view of a gas separation plant according to the invention having two centrifugal separators, coupled in parallel and functioning by co-current separation, in a gas-scrubbing operating state; and
Fig. 4 is a schematic side view of the gas separation plant in Fig. 3 during cleaning of the rotor of the one centrifugal separator on the left of the drawing.
MODE(S) FOR CARRYING OUT THE INVENTION
In Figs. 1 and 2 a gas separation plant for separating liquid particles and solid particles from a contaminated gas, such as a water-cooled flue gas from a thermal power station, for example, is generally denoted by 10. The gas separation plant 10 comprises two (or more) centrifugal separators 12, coupled in parallel and of a type known in the art, each of which has a fixed housing 14 and a schematically indicated rotor 16 rotatably supported therein, each having a large number of preferably conical disk elements stacked with intervening spaces between them. The separators 12 have a common feed 18 for the contaminated gas that is to be scrubbed, and each has a gas inlet 20 in a side wall of the housing 14. An outlet 22 for the gas scrubbed in the separator 12 is arranged on top of each housing 14, and a gas outlet line 24 extends from the outlet 22 towards a common gas outlet 26, in which a fan 28 is fitted, which in normal operation draws the contaminated gas through both (all) of the centrifugal separators 12 from the common feed 18. The separator housings 14 have bottom outlets (not shown) for solid and liquid phases, which have been separated out by the rotor disk elements.
Situated in each of the respective gas outlet lines 24 is a rotatable damper 30, which in normal gas scrubbing operation can be kept open in order to allow a common intake of contaminated gas into the separators 12 and a common extraction of scrubbed gas therefrom. Also situated upstream of the dampers 30 in each of the outlet lines 24 is a fresh air inlet 34 that can be either opened or closed by a valve 32, said valve 32 being kept closed during normal gas scrubbing operation.
When, after a period of use, the disk elements of the rotor 16 have become fouled by adhering solid and liquid particles from the contaminated gas, the disk elements of the rotors 16 can easily and rapidly be cleaned of these contaminants in that the damper 30 in the one gas outlet line 24, in Fig. 2 the left-hand line, is closed and the associated air inlet valve 32 is simultaneously opened, fresh air being made to flow through the rotor 16 in a direction counter to the normal direction of flow of the gas, first drying, then "tearing off the contaminants with the aid of the gas inlet 20 of the other, in Fig. 2 the right-hand, still active separator 12, which is connected to the inlet 20 of the left-hand separator 12, which is being cleaned and which is under the continuous suction effect of the fan 28. After cleaning the one, left-hand separator 12, the process can be switched over and the outlet line 24 of the right-hand separator 12 can then be closed and the fresh air inlet 34 opened in order to clean the right-hand separator 12 in a corresponding manner.
Even though the preferred embodiment of the gas separation plant shown in Figs. 1 and 2 operates with so-called counter-current separation, that is to say the gas that is to be scrubbed flows from outside and radially into the centre of the rotor 16, it is naturally also possible to conduct the gas into the centre of the rotor 16 and to allow it to flow radially out through the gaps between the disk elements in a so-called co-current separation, as shown in Figs. 3 and 4. Since the rotors 16, due to their rotation, generate a pumping action, in the co- current embodiment in Figs. 3 and 4, a common or separate extraction fan is not necessary since the pumping action of the rotor tends to expel the scrubbed gas from the separator. In the co-current embodiment in Figs. 3 and 4 the contaminated gas is led via the feed 18 into the centre of the rotor 16 via a respective inlet 20a of each separator 12, following which it flows radially out through the rotor 16, where the contaminants are separated out, and then out through the gas outlet line 24 and a common gas outlet 26. When after a period of use the disk elements of the rotor 16 have become fouled by adhering solid and/or liquid particles from the contaminated gas, the disk elements of the rotors 16 can easily and rapidly be alternately cleaned of these contaminants in that the damper 30 in the one gas outlet line 24, in Fig. 4 the left-hand line, is closed whilst the associated air inlet valve 32 is simultaneously opened and a valve 35 closes the inlet 20a, fresh air from the air inlet 34 being made to flow through the rotor 16 in the same direction as the normal direction of flow of the gas, first drying, then "tearing off the contaminants with the aid of the other, in Fig. 4 the right- hand, still active separator 12, which is connected via its inlet 20a to the outlet 22 of the left-hand separator 12 via an open return line 36. In normal gas scrubbing operation a valve 38 keeps the return line 36 closed, as shown in Fig. 3.
After cleaning of the one separator, in Fig. 4 the left-hand separator 12, the process can be switched over in order to activate the left-hand separator 12, and the outlet line 24 of the right-hand separator 12 can then be closed by the damper 30 and the fresh air inlet 34 opened, whilst the associated gas inlet valve 35 is simultaneously closed and the valve 38 of the return line 36 is opened in order to clean the right-hand separator 12 in a corresponding manner.
In order to facilitate the cleaning of the disk elements of the rotor, the rotational speed of the rotor 16 may be reduced during the cleaning phase to such a degree that vibrations naturally occurring in the rotor are used in order to shake loose the contaminants deposited on the disk elements of the rotor.
In order to facilitate and speed up yet further the cleaning of the disk elements of the rotor 16, a cleaning liquid may be added, in a manner known in the art, to the air flow from the fresh air inlet 34 during the cleaning phase of the rotor
16 of the separator 12. This may be done, for example, by arranging an injection nozzle 40 on the air flow upstream side of the rotor 16, as shown in
Figs. 1 and 2 or upstream of the rotor 16 (not shown) in respect of the gas flow in the co-current embodiment in Figs. 3 and 4. It is possible, however, to arrange such cleaning nozzles both upstream and downstream of the rotor 16.
In the exemplary embodiments described centrifugal separators are used having a rotor with radial, conical separating disks. It is naturally also feasible to use centrifugal separators, the rotors of which have axial disk elements which are involute in plan view.
Regardless of whether the gas stream flows from the inside outwards or from the outside into the rotor (co-current or counter-current separation), the flushing air always flows co-currently through the rotor, so as not to counteract the separation of the contaminants attached to and then released from the disk elements of the rotor. This applies to all embodiments according to the invention.
Even though there is a preference, in the embodiments of gas separation plants described above, for the use of a suction fan on the outlet side of the centrifugal separators, it is alternatively also feasible instead to pressurize the contaminated gas on the inlet side of the centrifugal separators. However, this would place greater demands on the sealing of the centrifugal separators, in order to ensure that untreated gas will not leak out from these during operation.

Claims

1. Method for cleaning a rotor of a centrifugal separator (12) in a gas separation plant having at least two centrifugal separators (12), coupled in parallel and functioning by counter-current separation, in which each centrifugal separator has a housing (14) with a rotatably supported rotor (16) with sedimentation surface elements, a gas inlet (20) coupled to a common gas feed (18) for contaminated gas, and a gas outlet (22) coupled to a gas outlet line (24, 26) for scrubbed gas, and having a fan (28) in the outlet line (26) in order to draw contaminated gas into both of the centrifugal separators (12) together during gas scrubbing operation, and to extract scrubbed gas from these via the outlet line (24, 26), characterized in that for cleaning the rotor (16) of one of the centrifugal separators (12), the outlet line (24) from this separator is shut off and an air inlet (34) in its gas outlet (22) upstream of the shut-off (30) in the outlet line (24) is opened, the air from the air inlet (34) being made to flow through the rotor (16) of the separator that is to be cleaned in a direction of flow opposed to the normal gas flow direction through the rotor and into the gas inlet (20) of the other, active centrifugal separator.
2. Method for cleaning a rotor of a centrifugal separator in a gas separation plant having at least two centrifugal separators (12), coupled in parallel and functioning by co-current separation, in which each centrifugal separator has a housing (14) with a rotatably supported rotor (16) with sedimentation surface elements, a gas inlet (20a) coupled to a gas feed (18) for contaminated gas, and a gas outlet (22) coupled to a gas outlet line (24, 26) for scrubbed gas, characterized in that for cleaning the rotor (16) of one of the centrifugal separators (12), the outlet line (24) from this separator is shut off and an air inlet (34) upstream of the separator rotor is opened, the air from the air inlet (34) being made to flow through the rotor (16) that is to be cleaned in the same direction of flow as the normal gas flow direction through the rotor and into the gas inlet (20a) of the other, active centrifugal separator via an open return line (36) from the gas outlet (22).
3. Method according to Claim 1 or 2, characterized in that the rotational speed of the rotor (16) is reduced during the cleaning phase to such a degree that vibrations naturally occurring in the rotor are used to shake loose the contaminants deposited on the sedimentation surface elements of the rotor.
4. Method according to Claim 1 or 2, characterized in that a cleaning liquid is added to the air flow from the air inlet (34) during the cleaning phase of the rotor.
5. Method according to one of Claims 1 to 4, characterized in that the gas to be cleaned is a flue gas.
6. Gas separation plant for separating liquid particles and/or solid particles from a contaminated gas, comprising at least two centrifugal separators (12), coupled in parallel and functioning by counter-current separation, in which each centrifugal separator has a housing (14) with a rotatably supported rotor (16) with sedimentation surface elements, a gas inlet (20) coupled to a common gas feed (18) for contaminated gas, a gas outlet (22) coupled to a gas outlet line (24, 26) for scrubbed gas, and a fan (28) in the outlet line (26) in order to draw in contaminated gas into the centrifugal separators (12) during normal gas scrubbing operation, and to extract scrubbed gas from these via the outlet line (24, 26), characterized in that a damper (30) is arranged upstream of the fan (28) in each gas outlet line (24, 26) from the respective separators, which damper (30) is designed to be capable of assuming an open position in normal gas scrubbing operation and a position shutting off the gas flow during cleaning of the rotor (16) of the associated separator (12), and that an air inlet (34) is arranged upstream of the damper (30) in the gas outlet (22) from the separator and is designed to be alternately opened and closed on closing or opening of the associated damper (30).
7. Gas separation plant for separating liquid particles and/or solid particles from a contaminated gas, comprising at least two centrifugal separators (12), coupled in parallel and functioning by co-current separation, in which each centrifugal separator has a housing (14) with a rotatably supported rotor (16) with sedimentation surface elements, a gas inlet (20a) for contaminated gas, and a gas outlet (22) coupled to a gas outlet line (24, 26) for scrubbed gas, characterized in that a damper (30) is arranged in each gas outlet line (24, 26) from the respective separators, which damper (30) is designed to be capable of assuming an open position in normal gas scrubbing operation and a position shutting off the gas flow during cleaning of the rotor (16) of the associated separator (12), and that an air inlet (34) is arranged upstream of the rotor (16) and is designed to be alternately opened and closed on closing or opening of the associated damper (30), and that a gas inlet valve (35) in the gas inlet (20a) is designed to be closed during cleaning of the associated rotor (16), whilst a valve (38) in the outlet return line (36), which is connected to the inlet (20a) of another separator (12), keeps the return line (36) open.
8. Gas separation plant according to Claim 6 or 7, characterized in that an injection nozzle (40) for cleaning liquid is arranged upstream of the rotor (16) of the centrifugal separator (12) in respect of the air flow.
EP09730746.6A 2008-04-07 2009-03-24 Methods for cleaning a rotor of a centrifugal separator, and gas separation plants having such cleanable centrifugal separators Not-in-force EP2274105B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0800774A SE532274C2 (en) 2008-04-07 2008-04-07 Method of cleaning a rotor of a centrifugal separator, as well as gas separating plants with such cleanable centrifugal separators
PCT/SE2009/050308 WO2009126094A1 (en) 2008-04-07 2009-03-24 Methods for cleaning a rotor of a centrifugal separator, and gas separation plants having such cleanable centrifugal separators

Publications (3)

Publication Number Publication Date
EP2274105A1 true EP2274105A1 (en) 2011-01-19
EP2274105A4 EP2274105A4 (en) 2013-01-23
EP2274105B1 EP2274105B1 (en) 2015-09-09

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EP09730746.6A Not-in-force EP2274105B1 (en) 2008-04-07 2009-03-24 Methods for cleaning a rotor of a centrifugal separator, and gas separation plants having such cleanable centrifugal separators

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EP (1) EP2274105B1 (en)
SE (1) SE532274C2 (en)
WO (1) WO2009126094A1 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE535115C2 (en) 2010-10-21 2012-04-17 3Nine Ab Apparatus for centrifugal separation of particles from a gas flow where two or more rotors are arranged in a common housing
EP3287194B1 (en) * 2016-08-25 2021-01-13 Alfdex AB High speed cleaning of a centrifugal separator
EP3287193B1 (en) 2016-08-25 2021-05-26 Alfdex AB Control of a centrifugal separator
CN108262178B (en) * 2018-02-23 2024-03-26 安徽普源分离机械制造有限公司 Separator with high cleaning capacity
EP4275797A1 (en) * 2022-05-09 2023-11-15 Alfa Laval Corporate AB A centrifugal separator

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Publication number Priority date Publication date Assignee Title
FR617617A (en) * 1925-06-18 1927-02-23 Apparatus and method for cleaning the blades and the distributor spider (attachment spider) of centrifugal separators, without disassembling the individual blades or those of the spider
SE505398C2 (en) * 1995-11-09 1997-08-18 Alfa Laval Ab Methods and apparatus for internal cleaning of a centrifuge rotor
US5908376A (en) * 1997-09-11 1999-06-01 Costner Industries Nevada, Inc. Self-cleaning rotor for a centrifugal separator
SE0302957L (en) * 2003-11-07 2004-10-26 Alfa Laval Corp Ab An entrainment device for a centrifugator
SE526828C2 (en) * 2004-03-15 2005-11-08 Tetra Laval Holdings & Finance Method of streamlining fat separation by separating a liquid food product

Non-Patent Citations (2)

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Title
No further relevant documents disclosed *
See also references of WO2009126094A1 *

Also Published As

Publication number Publication date
EP2274105A4 (en) 2013-01-23
SE532274C2 (en) 2009-12-01
SE0800774L (en) 2009-10-08
WO2009126094A1 (en) 2009-10-15
EP2274105B1 (en) 2015-09-09

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