WO2009112446A1 - Procédé et système de décontamination pour des unités d’admission d’air, et tête de nettoyage pour un tel système - Google Patents

Procédé et système de décontamination pour des unités d’admission d’air, et tête de nettoyage pour un tel système Download PDF

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Publication number
WO2009112446A1
WO2009112446A1 PCT/EP2009/052702 EP2009052702W WO2009112446A1 WO 2009112446 A1 WO2009112446 A1 WO 2009112446A1 EP 2009052702 W EP2009052702 W EP 2009052702W WO 2009112446 A1 WO2009112446 A1 WO 2009112446A1
Authority
WO
WIPO (PCT)
Prior art keywords
fluid
conduit
cleaning head
stream
aperture
Prior art date
Application number
PCT/EP2009/052702
Other languages
English (en)
Inventor
Stefano Borean
Original Assignee
Aria 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
Application filed by Aria Srl filed Critical Aria Srl
Priority to EP09721063A priority Critical patent/EP2274110B1/fr
Publication of WO2009112446A1 publication Critical patent/WO2009112446A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/02—Cleaning pipes or tubes or systems of pipes or tubes
    • B08B9/027—Cleaning the internal surfaces; Removal of blockages
    • B08B9/04—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes
    • B08B9/049—Cleaning the internal surfaces; Removal of blockages using cleaning devices introduced into and moved along the pipes having self-contained propelling means for moving the cleaning devices along the pipes, i.e. self-propelled
    • B08B9/0495—Nozzles propelled by fluid jets

Definitions

  • the present invention concerns a method and a system to decontaminate air intake plants in an optimized manner.
  • the method and the system according to the present invention provide the combined use of an aspirator and a cleaning head for the dry removal of particulate inside the plant, without dispersing it in the environment.
  • the cleaning head has a substantially tapered shape with head and tail ends of reduced sizes.
  • the head also defines, in its central zone where it is largest, a circular crown from which a first pressurized fluid is delivered, normally compressed air, in a direction opposite the direction of advance.
  • the fluid delivered has the sole function of causing the propulsion of the head inside the conduit
  • a nozzle is provided, able to deliver, in the same direction as the advance of the head, a second cleaning and sanitizing fluid, different and distinct from the first fluid, normally a nebulized liquid.
  • a flexible pipe is connected, internally conformed so as to feed separately both the first and the second fluid.
  • the flexible pipe has a degree of flexibility such as to allow an operator to guide from outside the cleaning head inside the conduit to be decontaminated.
  • this type of known cleaning heads have a relatively heavy weight, especially due to the complex internal conformation of both the flexible pipe and also the body of the cleaning head itself, to provide different and separate feed and delivery pipes of the two fluids delivered, of which one is normally a liquid.
  • This weight limits the range of action of the cleaning head inside the conduit, which can reach at most 15 meters, instead of the potential 25-30 meters.
  • the head nozzle not only has a weight that affects the overall weight of the cleaning head, but also is frequently subject to accidental knocks against the internal walls of the conduit to be cleaned.
  • a second system in which the cleaning head has a shape that substantially recalls a jellyfish.
  • the head has a front part like a cap and a body tapering toward the tail end and provided with a plurality of mobile appendices, or tentacles, made of flexible material.
  • the front part is made of or lined with elastomer material in order to absorb the knocks, and defines, in correspondence with the zone where it is joined to the tapered body, a circular crown to deliver a fluid under pressure to cause the propulsion.
  • the cleaning and mechanical removal of the particulate is carried out in this case only with the mobile appendices, which are made of plastic or elastomer material with a determinate degree of flexibility.
  • the propulsion and cleaning are performed separately, and the cleaning head has a relatively heavy weight, especially due to the composition of the front part, and due to the need to provide a body large enough to support a high number of appendices so as to guarantee an effective decontamination of the conduit.
  • the front part made of elastomer allows to absorb the knocks, on the other hand it causes an increase in friction with the internal surfaces of the conduit.
  • this type of known system has a limited range of action of the cleaning head inside the conduit, and can reach at most 10-15 meters instead of the potential about 25-30 meters.
  • the cleaning action of the tentacles may be not very efficient and due to their wear and possible breakage the cleaning head may need to be completely replaced.
  • Purpose of the present invention is to achieve a system and perfect a method to decontaminate air intake plants which is simple, economical, safe, effective and which allows to solve the problems of the state of the art.
  • a decontamination system for air intake plants comprises at least a cleaning apparatus able to be at least partly inserted inside a conduit of the plant in order to remove any possible dirt present, for example by dry cleaning, in particular on the internal surfaces of the conduit, and an intake apparatus able to take in the dirt removed by the cleaning apparatus, in order to prevent the dispersion thereof into the environment.
  • the cleaning apparatus comprises at least a cleaning head able both to be inserted and moved inside the conduit, and also to deliver under pressure at least a stream of fluid.
  • the cleaning head comprises a tapered hollow body conformed so as to define at least a first shaped exit aperture that directs at least a first portion of the stream of fluid in the direction opposite the direction of advance of the head, and with an angle such as to hit, advantageously uniformly, at least part of the internal surfaces of the conduit, so as to guarantee that the dirt is removed, and at the same time to - A -
  • the cleaning head also comprises at least a second aperture, independent and separate from the first aperture, and shaped so as to direct a second portion of the stream of fluid in the direction opposite the direction of advance of the head, and with an angle such as to determine the movement of the cleaning head inside the conduit of the plant.
  • the propulsion of the cleaning head is optimized, so as to further increase the range of action of the head.
  • two-phase fluid we mean a proportional mixture of two or more fluids, for example air and nebulized sanitizing liquid.
  • This advantage allows to simplify the internal conformation of the hollow body, reducing the overall weight of the cleaning head, and thus increasing its range of action inside the plant, even up to about 20 meters.
  • the fluid is fed under pressure through a flexible pipe connected to the tail end of the cleaning head.
  • the flexible pipe is also simplified since it must provide for the flow of a single fluid and not two or more separate fluids.
  • the hollow body comprises an annular slit which defines the exit of the first aperture, so that the stream of fluid exiting is substantially uniform.
  • the hollow body comprises two semi-shells coupled with each other and shaped so as to define the annular slit.
  • this conformation determines a dynamic depression of the stream that allows a substantially constant adhesion of the cleaning head to the internal surfaces of the conduit.
  • the intake apparatus is of the modular type and comprises one or more filtering modules, possible coupled with each other, and a ventilation member able to generate the intake depression in the conduit.
  • each filtering member can be individually replaced by a new one or another type, depending, on each occasion, on the type of decontamination and/or degree of saturation of each of them.
  • the ventilation member is advantageously disposed downstream of the filtering module or modules, so as to guarantee, even in the accidental event of a loss of seal, that the dirt collected is not dispersed into the environment.
  • the intake apparatus comprises one or more closing elements, able to be disposed transverse to the conduit so as to effect a volumetric division thereof.
  • the decontamination operations are carried out in closed and limited segments of the conduit, optimizing functionality and consumption of the entire decontamination system.
  • the cleaning apparatus comprises at least a compression member able to generate the stream of fluid.
  • a device is provided between the compression member and the cleaning head to purify the fluid.
  • a mixer member is advantageously provided able to mix the fluids proportionally.
  • - fig. 1 is a schematic view of a decontamination system according to the present invention
  • - fig. 2 is a schematic view of an enlarged detail of the system in fig. 1 ;
  • - fig. 3 is a schematic view of a longitudinal section of the enlarged detail in fig.
  • a decontamination system 10 according to the present invention is shown schematically, applied for the dry decontamination and sanitization of a conduit 1 1 of an air intake plant.
  • the decontamination system 10 comprises a cleaning apparatus 12 which by means of a pressurized fluid effects the removal of dirt from the conduit 11 , and an intake apparatus 13 that takes in from inside the conduit 1 1 the dirt removed by the cleaning apparatus 12.
  • the cleaning apparatus 12 comprises a compressor 15, a purification device 16, a mixer 17, a flexible pipe 19 and a cleaning head 20.
  • the compressor 15 is disposed outside the conduit 1 1 to be decontaminated, is connected pneumatically to the cleaning head 20, and is able to generate a stream of fluid with a desired pressure.
  • the fluid used is compressed air and has a pressure comprised between about 5 bar and about 10 bar, advantageously about 7 bar.
  • a purification device 16 Downstream of the compressor 15, and always outside the conduit 1 1 , a purification device 16 is provided, which allows to reduce to a minimum the presence of pollutants from the stream of compressed air generated by the compressor 15.
  • a mixer 17 is provided, such as for example a pneumatic pump, able to mix proportionally a nebulized sanitizing liquid with the compressed air, so as to form a desired single two-phase fluid.
  • the mixer 17 is connected to the cleaning head 20 by means of the flexible pipe 19, which has at least a segment outside and a segment inside the conduit 11.
  • the flexible pipe 19 is conformed simply with a tubular shape, to allow the single two-phase fluid provided to flow therein.
  • the flexible pipe 19 is made for example of rubber, plastic or other material able on the one hand to guarantee a good pneumatic seal and resistance to wear and knocks and, on the other hand, a weight and degree of flexibility such as to be able to follow the path, also tortuous, of the conduit 1 1 to be decontaminated.
  • the degree of flexibility of the flexible pipe 19 is such as to allow an operator, located outside the conduit 11, to move the cleaning head 20 with respect to the section of the conduit 1 1 , simply by acting on the flexible pipe 19.
  • the cleaning head 20 is made of light metal material, for example aluminum or its alloys, and comprises a tapered hollow body 25 defined substantially by two semi-shells, respectively a first 26 and a second 27, coupled with each other in a central zone of the cleaning head 20.
  • the conformation of the hollow body 25 is such as to guarantee an optimum balance of the cleaning head 20 during its advance inside the conduit 1 1.
  • the first semi-shell 26 is disposed in the head part of the hollow body 25 and has a substantially conical or truncated cone shape, to facilitate the movement and insertion of the cleaning head 20 inside the conduit 11.
  • the first semi-shell 26 comprises externally at least a portion covered with an elastomer material which absorbs and deadens the accidental knocks against the internal part of the conduit to be decontaminated.
  • the first semi-shell 26 also comprises a collar 29 made in correspondence with its rear end, that is, the end near the central zone of the cleaning head 20 and coupling with the second semi-shell 27.
  • the collar 29, unlike the remaining conical or truncated cone part of the first semi-shell 26, has circular surfaces substantially parallel to a longitudinal axis of the cleaning head 20.
  • the second semi-shell 27 is disposed in the tail part of the hollow body 25, it also has a substantially conical or truncated cone shape, and defines at one end a tubular terminal 30 on which the end of the flexible pipe 19 is coaxially mounted, to allow the entry of the two-phase fluid inside the hollow body 25.
  • the second semi-shell 27 comprises a collar 31 made in correspondence with its front end, that is, the end near the central zone of the cleaning head 20 and coupling with the first semi-shell 26.
  • the collar 31 unlike the remaining conical or truncated cone part of the second semi-shell 27, has circular surfaces substantially parallel to a longitudinal axis of the cleaning head 20.
  • the head 20 thus conformed delivers a stream of fluid uniformly against the walls of the conduit 1 1, and efficiently removes the dirt present.
  • the reciprocal conformation of the two collars 29 and 31 is such as to define an annular slit 32 able to direct at exit the two-phase fluid so as to determine a correct impact against the internal walls of the conduit 11, and also to generate the propulsion of the cleaning head 20 along the conduit 1 1, and also to define a dynamic pressure at exit, able to allow to maintain a condition of movement of the cleaning head 20 adhering to the walls of the conduit 1 1 to be cleaned.
  • the second semi-shell 27 comprises one or more through holes 33 on its conical or truncated cone part, in this case three disposed at 120° with respect to each other, and able to define a second outlet for the fluid.
  • the through holes 33 are conformed so as to direct the stream of two-phase fluid in a direction substantially opposite the direction of advance of the cleaning head 20, so as to improve the conditions of advance thereof.
  • the second semi-shell 27 comprises internally a chamber 35 to distribute the two-phase fluid, in which a conical or truncated cone deflector 36 is provided, coordinated with the shape of the second semi-shell 27.
  • the deflector 36 is able to divide the pressurized stream arriving from the flexible pipe 19 in order to direct it uniformly inside the different zones of the hollow body 25.
  • the stream of two-phase fluid is divided in a desired manner, so as to guarantee its exit under pressure both through the annular slit 32 and also through the through holes 33.
  • a dividing wall 38 is provided, on which a plurality of passage holes 37 are made, of which only two are visible in the section in fig. 3, angularly offset with respect to each other and able to allow the passage of the fluid between one and the other of the two semi-shells 26, 27.
  • the fluid that passes through the passage holes 37 is intended to exit under pressure from the annular slit 32.
  • the first and the second semi-shell 26, 27 are maintained reciprocally coupled by means of an attachment screw 34, inserted axially from the front top of the first semi-shell 26 and screwed into a relative threaded hole made at the rear of the deflector 36 of the second semi-shell 27.
  • the intake apparatus 13 comprises an intake pipe 21 , a modular aspirator 22 and a plurality of closing walls 23.
  • the intake pipe 21 is on one side generally connected inside the conduit 1 1 to be decontaminated and on the other side connected to the modular aspirator 22, so as to determine a desired depression or intake inside the conduit 11.
  • the modular aspirator 22 is provided outside the conduit 11 and comprises a plurality of filtering modules disposed in a battery upstream of a ventilation member 39, which generates the intake stream of air.
  • each of the filtering modules has its own coefficient of air filtration.
  • a first filtering module 40 with low efficiency is provided, such as a plenum chamber; a second filtering module 41 with a degree of efficiency comprised between about 20% and about 40%, such as an average filtering medium; a third filtering module 42 with a degree of efficiency comprised between about 70% and 90%, and a fourth filtering module 43 with a degree of efficiency comprised between about 80% and 99%.
  • the first filtering module 40 comprises at the lower part a compartment 45 to discharge the solid deposits.
  • a relative pressure switch 46 is associated with each of the filtering modules indicated by the reference numbers 41, 42 and 43.
  • Each pressure switch 46 is able to verify and indicate the actual loss of load of the filtering modules 41, 42 and 43, so as to indicate to the operator any need to replace one or another of said modules.
  • the modular composition of the aspirator 22 allows to reduce, implement, replace or change, selectively, the individual filtering modules 40, 41 , 42 and 43 according to the specific operations or operating conditions.
  • the cleaning head 20 is disposed inside the limited zone and decontamination is performed. This solution allows to optimize the air intake conditions inside the conduit 1 1 and thus guarantee the correct intake and discharge of the dirt that is removed by the cleaning head 20.
  • the closing walls 23 each comprise a shutter. According to another variant, the closing walls 23 comprise fire-barrier plates.
  • the decontamination system 10 as described heretofore functions as follows.
  • the conduit 11 to be decontaminated is prepared, possibly by removing the air distribution accessories, and by positioning the closing walls 23 appropriately, so as to define the closed sector in which decontamination is to be performed.
  • the intake pipe 21 is connected and the modular aspirator 22 is activated, to generate the determinate depression.
  • both the intake pipe 21 and the cleaning head 20 are put into cooperation with the inside of the conduit 11 through respective apertures already present in the conduit 11 and normally used to distribute air.
  • the intake pipe 21 and the cleaning head 20 are put into cooperation with the conduit through two independent apertures.
  • the intake pipe 21 is put into cooperation with the conduit through a relative aperture, whereas the cleaning head 20 is inserted into the intake pipe 21 and enters into the conduit 1 1 through the same aperture as the intake pipe 21.
  • the compressor 15 is activated so as to generate the stream of compressed air.
  • the mixer 17 remains inactive, so that the removal of the dirt inside the conduit 11 occurs only with the compressed air.
  • the cleaning head 20 removes the dirt uniformly and advances inside the conduit 11.
  • the depression generated by the modular aspirator 22 causes the dirt removed to be taken in through the intake pipe 12.
  • the mixer 17 is activated, so that the cleaning head 20 delivers a two-phase fluid including sanitizing fluid.
  • the mixer 17 is again de-activated to deliver only compressed air and to dry the inside of the decontaminated conduit 1 1.
  • the compressor 15 and the ventilation member 39 are switched off, the cleaning head 20 is removed, the intake pipe 21 is disconnected and the closing walls 23 removed.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Cleaning In General (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

La présente invention concerne un système de décontamination (10) pour des unités d’admission d’air comportant un appareil de nettoyage (12) inséré au moins en partie dans un conduit (11) de l’installation en vue d’éliminer de la poussière éventuellement présente, notamment sur au moins une partie des surfaces internes du conduit (11), et un appareil d’aspiration qui aspire la poussière prélevée par l’appareil de nettoyage (12), pour empêcher sa dispersion dans l’environnement. L’appareil de nettoyage (12) comporte au moins une tête de nettoyage (20) qui est introduite et déplacée dans le conduit (11), et distribue sous pression au moins un flux de fluide. La tête de nettoyage (20) comporte un corps creux (25) conformé pour définir au moins une première ouverture de sortie (32) configurée pour orienter au moins une première partie du flux de fluide dans une direction de manière à assurer la propulsion vers l’avant de la tête de nettoyage (20), et avec une inclinaison de manière à percuter les surfaces internes.
PCT/EP2009/052702 2008-03-12 2009-03-09 Procédé et système de décontamination pour des unités d’admission d’air, et tête de nettoyage pour un tel système WO2009112446A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP09721063A EP2274110B1 (fr) 2008-03-12 2009-03-09 Procédé et système de décontamination pour des unités d'admission d'air, et tête de nettoyage pour un tel système

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITUD20080052 ITUD20080052A1 (it) 2008-03-12 2008-03-12 Procedimento e sistema di bonifica per impianti di aspirazione aria, e testina di pulizia di detto sistema
ITUD2008A000052 2008-03-12

Publications (1)

Publication Number Publication Date
WO2009112446A1 true WO2009112446A1 (fr) 2009-09-17

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PCT/EP2009/052702 WO2009112446A1 (fr) 2008-03-12 2009-03-09 Procédé et système de décontamination pour des unités d’admission d’air, et tête de nettoyage pour un tel système

Country Status (3)

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EP (1) EP2274110B1 (fr)
IT (1) ITUD20080052A1 (fr)
WO (1) WO2009112446A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015001534A1 (de) * 2015-02-06 2016-08-11 Jürgen Burkhard Sprühvorrichtung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658589A (en) * 1969-09-12 1972-04-25 Myers Sherman Co Catch basin and sewer pipe cleaner
US4216738A (en) * 1977-12-21 1980-08-12 Kabushiki Kaisha Kankyo Kaihatsu Method of renewing water pipe, including coating thereof, and apparatus therefor
US4718142A (en) * 1986-07-31 1988-01-12 D.W. Tool, Inc. Gas driven pipe cleaner and reel
DE19607913A1 (de) * 1996-03-01 1997-09-11 Kurt Hoerger Hydrodynamisches Kanalreinigungs- und Überwachungsgerät
FR2830470A1 (fr) * 2002-02-06 2003-04-11 Hydrolog Installation de curage des canalisations

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3658589A (en) * 1969-09-12 1972-04-25 Myers Sherman Co Catch basin and sewer pipe cleaner
US4216738A (en) * 1977-12-21 1980-08-12 Kabushiki Kaisha Kankyo Kaihatsu Method of renewing water pipe, including coating thereof, and apparatus therefor
US4718142A (en) * 1986-07-31 1988-01-12 D.W. Tool, Inc. Gas driven pipe cleaner and reel
DE19607913A1 (de) * 1996-03-01 1997-09-11 Kurt Hoerger Hydrodynamisches Kanalreinigungs- und Überwachungsgerät
FR2830470A1 (fr) * 2002-02-06 2003-04-11 Hydrolog Installation de curage des canalisations

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102015001534A1 (de) * 2015-02-06 2016-08-11 Jürgen Burkhard Sprühvorrichtung
US10105739B2 (en) 2015-02-06 2018-10-23 Juergen BURKHARD Spraying device

Also Published As

Publication number Publication date
EP2274110A1 (fr) 2011-01-19
ITUD20080052A1 (it) 2009-09-13
EP2274110B1 (fr) 2012-09-26

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