EP2384827A1 - Method and apparatus for cleaning demister panels - Google Patents

Method and apparatus for cleaning demister panels Download PDF

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Publication number
EP2384827A1
EP2384827A1 EP11161870A EP11161870A EP2384827A1 EP 2384827 A1 EP2384827 A1 EP 2384827A1 EP 11161870 A EP11161870 A EP 11161870A EP 11161870 A EP11161870 A EP 11161870A EP 2384827 A1 EP2384827 A1 EP 2384827A1
Authority
EP
European Patent Office
Prior art keywords
cleaning
panel
movement
spray
gun
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.)
Withdrawn
Application number
EP11161870A
Other languages
German (de)
English (en)
French (fr)
Inventor
Antonio De Paola
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.)
Studio Nuove Applicazioni Industriali Srl
Original Assignee
Studio Nuove Applicazioni Industriali Srl
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
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Application filed by Studio Nuove Applicazioni Industriali Srl filed Critical Studio Nuove Applicazioni Industriali Srl
Publication of EP2384827A1 publication Critical patent/EP2384827A1/en
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/024—Cleaning by means of spray elements moving over the surface to be cleaned
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
    • B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
    • B07B1/00—Sieving, screening, sifting, or sorting solid materials using networks, gratings, grids, or the like
    • B07B1/46—Constructional details of screens in general; Cleaning or heating of screens
    • B07B1/50—Cleaning
    • B07B1/55—Cleaning with fluid jets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
    • B08B3/02—Cleaning by the force of jets or sprays
    • B08B3/022—Cleaning travelling work

Definitions

  • the present invention relates to a method and apparatus for cleaning demister panels.
  • the demister also known as mist eliminator or droplet separator, is a device inserted into an apparatus for promoting the separation of the liquid phase (in the form of liquid droplets dragged by the stream) from the gaseous phase in streams of liquid-vapour type.
  • the use of the demister decreases the time required for the separation, and this results in a smaller volume of the apparatus, and a consequent cost reduction.
  • the demister is generally formed by a housing which is accessible on two sides, an inlet and an outlet for the stream to be separated, and contains a dense mesh demister, or a metal wire mesh.
  • a collection container is arranged at the outlet of the demister for the liquid phase which has been separated from the gaseous stream.
  • the operation of the demister is the following: the liquid droplets transported by the gaseous stream knock against the demister meshes, they lose most of their kinetic energy and tend to rest on the demisters meshes; the meshes also provide a surface on which the droplets which remain thereon tend to group together (coalescence) into bigger droplets; when the mass/outer surface ratio of the droplets overcomes a specific quantity, the force of gravity prevails over the force associated with the formation of the liquid-solid interface (related to the surface which defines the small droplets), and the droplets fall into the collection container at the outlet.
  • the demister in particular is highly used as a droplet separator for high sulphur fuels, slurry with high concentrations of limestone, salt saturated waters and, in short, chemically and physically aggressive substances, which cause the filtering action of the demisters to decrease if they are not regularly cleaned. These devices are hence subject to frequent machine stops, either for routine cleaning or for extraordinary cleaning.
  • cleaning the demister panels is generally performed by stopping the system and making the outlet or inlet accessible for the projection of a great quantities of pressurized fluid spray therein, suitable for cleaning the meshes, i.e. filtering material of the panel. Cleaning is performed by specialized personnel who is generally forced to perform it in confined environments, which generates a high percentage of injuries, by orienting a spray-gun with end nozzles towards the panel and passing it over the whole surface.
  • the demisters are usually comprised within hollow confining structures in which the operator should enter for the manual cleaning. Access inside said structures is difficult and dangerous for the operator as the closed environment in which the demisters are contained does not promote the disposal of dangerous gases.
  • GB-2235393 describes an apparatus for cleaning filtering panels.
  • an apparatus 1 for cleaning filtering demister panels 2 comprised within a hollow parallelepiped containing structure 100 comprising a frame 3.
  • structure 100 is formed by four vertical walls of panels 2 with frame 3 horizontal to close structure 100 at the top.
  • Apparatus 1 comprises compressed fluid cleaning means 4 suitable for being installed by means of positioning means 8 inside structure 100 through an opening 51 of frame 3.
  • Frame 3, together with the panels 2, defines a cavity 52.
  • Said positioning means 8 are external to structure 100.
  • Frame 3 may provide several openings 51 for various cleaning means 4 which are to be very close to the panels 2.
  • the cleaning means are a spray-gun 4 ( figures 1 , 2 , 3 ) or a rotating head 14 ( figures 4 , 5 , 6 ).
  • the spray-gun 4 is selectively movable between movement means 9, 11, they also being external to structure 100, between a first limit position corresponding to a first edge 5 of the panel ( figure 3 , where the volume occupied by panel 2 with respect to the spray-gun is traced with a dash-dotted line) and a second limit position corresponding to a second edge 6 of the panel ( figure 3 ) opposite to the first edge 5, thus performing the cleaning substantially of the whole panel 2 during the movement of the spray-gun 4 between the first and the second position.
  • the spray-gun 4 is of the type for pressurized cleaning fluid and is equipped with a body 55 with side arms 13 lying in a plane and equipped with nozzles 7 which eject substantially perpendicular with respect to the plane of the arms 13, and is suitable for allowing the filtering panel 2 to be operated during the cleaning of panel 2 with the spray-gun 4.
  • the arms 13 are perpendicular to the spray-gun 4.
  • the spray-gun 4, the arms 13 and the nozzles 7 are positioned so that during operation, the spray-gun covers the width or the length, and in any case the smaller dimension of panel 2 ( figure 3 in which panel 2 is represented with the dash-dotted line).
  • the spray-gun 4 is made with material suitable for supporting the high pressures of the cleaning fluid.
  • Body 55 of the spray-gun 4 is equipped with three series of arms 13 having eight nozzles 7.
  • the positioning means 8 comprise a sleeve 8 for associating the spray-gun 4 with frame 3 suitable for positioning it in front of panel 2 so that the nozzles 7 eject substantially perpendicular to panel 2.
  • the movement means 9 comprise a manual or electric pulley system 9 equipped with a cable 10 connected to the spray-gun 4, for the movement thereof.
  • the movement means 11 comprise a pneumatic piston system 11 connected to the spray-gun 4, for the movement thereof.
  • apparatus 1 comprises a pump 12 associated with the spray-gun 4 for supplying the pressurized fluid.
  • the operation of the spray-gun 4 provides that the spray-gun 4, the arms 13 and the nozzles 7 are positioned in such a way that during operation, the spray-gun covers the smaller dimension of panel 2, as explained above, and is secured to frame 3 by sleeve 8.
  • Said sleeve 8 leaves the spray-gun free to slide axially thereon (double arrow in figure 3 ) to be able to be moved in the direction of the length of the panel or, in any case, along the larger dimension of panel 2, respectively, thus cleaning the whole surface of the panel.
  • the movement of the spray-gun 4 is performed by the pulley or pneumatic piston systems described, with known methods, by moving it between the first top limit position corresponding to the first edge 5 of panel 2 and the second bottom limit position corresponding to the second edge 6 of panel 2 opposite to the first edge 5.
  • the nozzles 7 translate on the whole surface of the panel and the cleaning is performed of the whole panel 2 during the operation of the demister panel 2.
  • the cleaning means may comprise, alternatively to the spray-gun 4, as mentioned above, a rotating head 14.
  • figure 6 shows panel 2 represented with a dash-dot line.
  • the rotating head 14 is equipped with nozzles 7 with a throw 15 (dash-dash line in figure 6 ) of pressurized cleaning fluid such as to cover the smaller dimension of panel 2.
  • the throw 15 of the rotating head 14 gradually translates substantially over the whole surface of panel 2, thus cleaning it.
  • the movement of the rotating head 14 is also performed by the pulley system 9 ( figure 4 ) or pneumatic piston system 11 ( figure 5 ) described above, with known methods, by moving it between the first top limit position corresponding to the first edge 5 of panel 2 and the second bottom limit position corresponding to the second edge 6 of panel 2 opposite to the first edge 5.
  • sleeve 8 and pump 12 also complement the embodiment with head 14 of the apparatus according to the invention, in the ways shown.
  • Control means 200 are also provided of said positioning 8 and movement means 9, 11 which are external to structure 100 so as to protect the operator from any danger.
  • panel 2 is to be stopped to allow the entry by the operator inside cavity 52 for the cleaning thereof.
  • the above-described cleaning apparatus permits a thorough maintenance of the panels 2 without risks for the operator who controls the cleaning means 4 from the outside by means of suitable and known control means 200.
  • Apparatus 1 may, in any case, also be used in the case of horizontal panels 2 comprised within a hollow structure 100 with the due adaptations that a skilled technician is able to do.
  • the cleaning means 4 will move horizontally along horizontal guides.

Landscapes

  • Details Or Accessories Of Spraying Plant Or Apparatus (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)
EP11161870A 2010-04-13 2011-04-11 Method and apparatus for cleaning demister panels Withdrawn EP2384827A1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
ITMI2010A000620A IT1399496B1 (it) 2010-04-13 2010-04-13 Apparato per la pulizia di pannelli filtranti.

Publications (1)

Publication Number Publication Date
EP2384827A1 true EP2384827A1 (en) 2011-11-09

Family

ID=42942184

Family Applications (1)

Application Number Title Priority Date Filing Date
EP11161870A Withdrawn EP2384827A1 (en) 2010-04-13 2011-04-11 Method and apparatus for cleaning demister panels

Country Status (2)

Country Link
EP (1) EP2384827A1 (it)
IT (1) IT1399496B1 (it)

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923088A (en) * 1960-06-09 1963-04-10 Aussie Mfg Ltd Particle freeing method and apparatus for particle sizing screens
US3853514A (en) * 1973-07-30 1974-12-10 Universal Oil Prod Co Movable demister system
GB2001872A (en) * 1977-08-02 1979-02-14 Perez Canales C Screening device for bulk mineral material in powder or granular form
GB2235393A (en) 1989-08-25 1991-03-06 Wu Kie Pyng Waste separator
WO1995033573A1 (en) * 1994-06-03 1995-12-14 Dorr-Oliver Incorporated Improved high-pressure screen shower
WO2001081017A2 (en) * 2000-04-20 2001-11-01 Multotec Manufacturing (Pty) Limited System and method for cleaning a screen
DE10350492A1 (de) * 2003-10-29 2005-06-09 Romag Röhren und Maschinen AG Reinigungsvorrichtung für einen Siebrechen, Siebrechen mit Reinigungsvorrichtung, sowie Verfahren zur Reinigung eines Siebrechens

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5282575A (en) * 1992-04-24 1994-02-01 Dorr-Oliver Incorporated High pressure screen shower
US5431287A (en) * 1994-03-31 1995-07-11 Sweco, Inc. Separator screen feeder

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB923088A (en) * 1960-06-09 1963-04-10 Aussie Mfg Ltd Particle freeing method and apparatus for particle sizing screens
US3853514A (en) * 1973-07-30 1974-12-10 Universal Oil Prod Co Movable demister system
GB2001872A (en) * 1977-08-02 1979-02-14 Perez Canales C Screening device for bulk mineral material in powder or granular form
GB2235393A (en) 1989-08-25 1991-03-06 Wu Kie Pyng Waste separator
WO1995033573A1 (en) * 1994-06-03 1995-12-14 Dorr-Oliver Incorporated Improved high-pressure screen shower
WO2001081017A2 (en) * 2000-04-20 2001-11-01 Multotec Manufacturing (Pty) Limited System and method for cleaning a screen
DE10350492A1 (de) * 2003-10-29 2005-06-09 Romag Röhren und Maschinen AG Reinigungsvorrichtung für einen Siebrechen, Siebrechen mit Reinigungsvorrichtung, sowie Verfahren zur Reinigung eines Siebrechens

Also Published As

Publication number Publication date
IT1399496B1 (it) 2013-04-19
ITMI20100620A1 (it) 2011-10-14

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