CA1317512C - Device for the cleaning of a heat exchanger - Google Patents
Device for the cleaning of a heat exchangerInfo
- Publication number
- CA1317512C CA1317512C CA000559810A CA559810A CA1317512C CA 1317512 C CA1317512 C CA 1317512C CA 000559810 A CA000559810 A CA 000559810A CA 559810 A CA559810 A CA 559810A CA 1317512 C CA1317512 C CA 1317512C
- Authority
- CA
- Canada
- Prior art keywords
- nozzle
- drive shaft
- auxiliary drive
- carrier
- high pressure
- 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.)
- Expired - Fee Related
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28G—CLEANING OF INTERNAL OR EXTERNAL SURFACES OF HEAT-EXCHANGE OR HEAT-TRANSFER CONDUITS, e.g. WATER TUBES OR BOILERS
- F28G1/00—Non-rotary, e.g. reciprocated, appliances
- F28G1/16—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris
- F28G1/166—Non-rotary, e.g. reciprocated, appliances using jets of fluid for removing debris from external surfaces of heat exchange conduits
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B37/00—Component parts or details of steam boilers
- F22B37/02—Component parts or details of steam boilers applicable to more than one kind or type of steam boiler
- F22B37/48—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers
- F22B37/483—Devices for removing water, salt, or sludge from boilers; Arrangements of cleaning apparatus in boilers; Combinations thereof with boilers specially adapted for nuclear steam generators
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- High Energy & Nuclear Physics (AREA)
- Thermal Sciences (AREA)
- Nozzles (AREA)
- Cleaning By Liquid Or Steam (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
The device comprises a spray device which itself possesses a carrier movable on a longitudinal guide, three supports mounted on said carrier and three nozzle holders rotatably mounted in respectively said three supports and containing each four radially directed nozzles. A fluid channel connects a high pressure line with said nozzles. An auxiliairy drive shaft which is borne in said supports and driven through a geared trans-mission by said high pressure line,drives each of the nozzle holders through the intermediairy of geared trans-mission.
The device comprises a spray device which itself possesses a carrier movable on a longitudinal guide, three supports mounted on said carrier and three nozzle holders rotatably mounted in respectively said three supports and containing each four radially directed nozzles. A fluid channel connects a high pressure line with said nozzles. An auxiliairy drive shaft which is borne in said supports and driven through a geared trans-mission by said high pressure line,drives each of the nozzle holders through the intermediairy of geared trans-mission.
Description
~31751~
: 3A CKGROtJND
The invention concerns a device for cleaning a heat exchanger, specifically a steam generator of the type that comprises:
- a jacket, ~ a pipe bundle installed inside it, in which bundle an open space 5 which opens towards the jacket is provided, through which at least a part of the bundle is accessible, and - at least one access opening in the jacket which leads into the open space, which cleaning device comprises a spray device which itself possesses a : 10 movable carrier and at least one nozzle holder mounted so that it re-volves around a geometrical axis of rotation on this carrier, which nozzle holder contains at least one nozzie whose nozzle opening is radially oriented with respect to the axis of rotation of the nozzle holder, which cleaning device also contains a high pressure line which 15 connects to the spray device at one end and through which liquid under pressure can be conveyed to the nozzle pipe, and a longitudinal guide along which the carrier can be moved.
Steam generators of the aforementioned type are widely used in nuclear power stations. The heating fluid heated in the nuclear reactor 20 is passed through the pipe bundle and gives up heat to a fluid, usually 1 3 1 75 1 ~
water, contained in the space around the pipes, thus generating steam. As a consequence of various chemical reactions an iron oxide, namely magnetite, is generated in the space around the pipe bundle.
This iron oxide is deposited on the pipe bundle, on the bearing plates 5 which support the pipe bundle and above all on the bottom. This iron oxide must be rernoved on each occasion"~sually annually, the nuclear power station receives maintenance. In connection with the difficulty of gaining access to the steam generator and above all because of the radioactive regime the steam generator cannot be dismantled, so that ~0 special installations are necessary for the removal of the sludge, and the iron oxide in particular.
Steam generators are known in which the pipes in the bundle are set up in a so-called Chinese diamond configuration and are thus located at the point of intersection of a network formed by !ines which 15 are not perpendicular to one another and are at an angle with the aforementioned plane of symmetry. Such steam generators are used among other places in KWU nuclear plants ( Kraftwerk-Union plants) .
In these known generators every pipe can be considered as forming part of three rows of pipes, namely one row of pipes which is 20 perpendicular to the plane of symmetry between the parts of the bundle, one row which lies at an angle of 30 to one side of this sym-metrical plane and a third row which lies at an angle of 30 to the ` 1317512 other side of this symmetrical plane. Between the pipes of a bundle section there are thus~also spaces which extend in three directions and in order to clean such a pipe bundle spraying is necessary in three directions, namely in those directions which form angles of 30, 90, 150 with the plane of symmetry. The spaces between the pipes which are at right angles to the aforementioned plane of symmetry are indeed quite narrow and cleaning by spraying into these spaces only would be insufficient .
Devices of the type referred to here are amongst others suited to cleanir4y steam generators of this sort.
Such a device is known from Belgian patent no. 900 . 716 .
In the device according to this patent the carrier contains a crab which runs over a guide and the wheels of which are driven by a flexible shaft from outside the steam generator.
The crab also comprises a turntable which can turn about a vertical axis and can be rotated by a cable and locked into various positions by a pawl attached to a flexible cable. Both these cables extend through a hole in the wall of the generator and are also operated from outside the generator.
The nozzle holcler mounted on the turntable is driven by means of a rotating clutch and a compressed air motor installed on the turntable.
The compressed air line for the compressed air motor and the high 1 3 1 1 5 1 ?
pressure hose also run through the same opening to the outside.
The known device is however rather complicated in constructio.n.
THE INVENTION
The object of the invention is to overcome these disadvantages and to provide a device for cleaning a heat exchanger which is simple in construc~ion, particularly suited for cleaning steam generators in which the pipes are set up in a diamond configuration and which allow relatively fast cleaning without risking damage to the pipes both for similar and for other heat exchangers.
To this end the spray device comprises at least one support which extends beyond the carrier, the nozzle holder is borne in the support so that it can rotate, the carrier and the support are jointly provided with a fluid channel that connects the end of the high pres-sure line to the nozzle holder and thus the nozzle as well, and the 15 cleaning device comprises an auxiliary drive shaft which is borne in the carrier, means for driving the auxiliary drive shaft and a transmission between the auxiliary drive shaft and the nozzle holder.
I n a noteworthy embodiment of the invention the transmission between the auxiliary drive shaft and the nozzle holder is a geared 20 ~ransmission containing a gearwheel mounted on the auxiliary drive shaft and a gearwheel affixed to the nozzle holder.
131~512 In a special embodiment of the invention the device comprises a transmission between the means for driving the auxiliary driving shaft and this auxiliary drive shaft.
The high pres~ure line can by preference be rotated with respect 5 to the carrier and forrns part of the means for driving the auxiliary drive shaft and the transmission between these means and the auxiliary drive shaft is mounted between the latter and the high pressure line.
In an advantageous embodiment of the invention the auxiliary drive shaft is borne by the support.
10In another noteworthy embodiment of the invention the device comprises at least two supports, two nozzle holders which are respec-~; tively borne by the supports and at least two transmissions between the auxiliary drive shaft and the nozzle holders respectively.
The device contains by preference three nozzle holders.
15In an advantageous embodiment of the invention the support of the nozzle holder is detachably mounted on the carrier.
Other particularities and advantages of the invention will be apparent from the description given below of a device for the cleaning of a heat exchanger accordin~ to the invention; this description is only 20 given as an example and by no means restricts the invention; the reference numbers refer to the attached drawings.
~ 7 ~ 1 3 1 7 5 1 2 DRAW:[NGS
Figure l is a side elevation of a cleaning device according to the invention and is partially cut away.
Figure 2 shows a cross section along the line l l-l l shown in 5 figu re l .
Figure 3 is a bottom view of the device in figure l in which the places of two nozzle holders have been interchanged.
In the various figures the same reference numi~ers refer to the same elements.
DESCRIPTION OF A PREFERRED EMBODIMENT
The cleaning device according to the figures is known for cleaning a steam generator in which the pipes are set up in the so-called Chinese diamond arrangement.
The device comprises a longitudinal guide 1 which is installed so 15 that it passes through openings in the wall of the steam generator (not shown) and is supported in a known way.
This guide 1 is a square section. A slot 21 with a mushroom shaped cross section extends over the entire length in each side.
The device also contains a carrier which comprises a body 2 and 20 a guide piece 3 which is attached by means of connectin~ pieces 4 to the body 2. Thls guide piece 3 has a mushroom-shaped section and slides into one of the slides 21 of guide 1 so that carrier 2, 3, 4 can slide along guide 1.
Three supports 5, 6 and 7 are detachably attached by means of bolts 42 to body 2 and protrude out of it on the side opposite the guide piece. An auxiliary drive shaft 8 is borne by the three supports 5, 6 and 7. A high pressure channel 9 which runs through the body 2 5 connects at the site of a chamber 11 formed in body 2 to a rigid high pressure line 10 rotatably mounted on one end of body 2~
The high pressure line 10 is directed in accordance with the travelling device of the carrier, and thus along the longitudinal direc-tion of guide 1.
The high pressure line 10 may consist of several pieces which can be screwed into one another.
Figure I shows only the end of the end-piece of this line 10 which connects to body 2. The extreme end of the high pressure line 10 is retained in chamber 11 of carrier 2, 3, 4 so that it can rotate and l~ yet not leak by a collar 12, which with the help of a back-up ring 13, hooks behind a short round pipe 15 which encircles the line 10 and which is mounted in a cover plate 16 which is fixed on carrier 2 by means of bolts 17 and which mark off chamber 11. A sealing ring 14 encircles the end of line 10.
The sealing ring 14 serves to prevent the high pressure !iquid, which flows from the high pressure line 10 into the high pressure channel 9 of carrier 2, 3 4, penetrating into chamber 11.
At the extreme end of the~high pressure line 10 a gearwheel 18 is mounted between collar 12 and ring 14.
The auxiliary drive shaft 8 which is also directed in the direction of movement of the carrier is borne by means oF a bearing 23 in a wall of chamber 11 and is mounted by means of bearings 24 in supports 5, 6, and 7. A gearwheel 19 permanently mounted on auxiiiary drive shaft 8: and three gearwheels~ 20 are detachably mounted on it. The gearwheels 20 are locked by small screws 43 on the auxiliary drive shaft.
The first gearwheei 19 meshes in the :gearwheel 18 on the high pressure line 10.
The three gearwheels 20 mesh respectively in gearwheels 28, 29 and 30 which are mounted on no2zle hoiders 25, 26 and 27.
Each of the three nozzle holders 25, 26 and 27 comprises a holl-w shaft 31 which forms part of each of them and by which they are borne in one of the supports by means of a bearing 32.
The three nozzle holders 25, 26 and 27 can thus be driven from outside the steam generator by means of the rigid high pressure line 10, a first geared transmission between the high pressure line 10 and the auxiliary shaft 8, consisting of the gearwheel 18 on the high pres-sure line 10 and the gearwheel 19 at the extrerne end of the auxiliary drive shaft 8 in the chamber 11, the auxiliary drive shaft 8 and a second geared transmission between this auxiliary drive shaft 8 and each of the nozzle holders 25, 26 and 27 and consisting of a gearwheel 20 on the auxiliary drive shaft 8 and a gearwheel 28, 29 or 30 of the respective no~zle holder 25, 26 and 27.
The geometrical axes of rotation of the hollow shafts 31 all lie in the same plane, parallel to the direction of movement of the carrier.
The carrier 2, 3, 4 is also provided with three side channels 34, one per nozzle holder, which are mounted at right angles with respect to the high pressure channel 9 and which open into it.
A channel 35 in each support 5, 6 or 7 connects a side channel 34 in the body 2 with a chamber 36 which is an expansion of the aper-ture which bears the hollow shaft 31 of the correponding nozzle holder 25, 26 or 27.
The hollow shaft 31 is p~ovid2d at th~ end m the vicinity of chamber 36 with two radial apertures 37 which connect the said chamber 36 to the space in the hollow shaft 31. At the other end the hollow shaft 31 is provided with four apertures 38. These apertures 38 form a connection between the space in the hollow shaft 31 and four threa~ed apertures 39 in which a nozzle 40 is screwed.
~317512 Two seals 33 and a seal piece 22 ensure the sealing of the holtow shaft 31 .
Liquid under high pressure flows from outside the steam yenerator through the high pressure line 10, the high pressure channel 9, the side channels 34, the channels 35 in the supports S, 6, and 7 the chamber 36, the radial apertures 37, the hollow shafts 31 and aperl:ures 38 and 39 to the apertures 41 of the nozzles and from there spray between the pipes of the steam generator~
As is especially apparent from figure 3 the supports 5, 6 7 stand at an angle with respect to one another.
As the nozzles 40 are radially oriented with respect to the geo-metrical axis of rotation of their nozzle holders 25, 26, and 27 they turn in planes which are perpendicular to the plane throuyh this geo-metrical axis of rotation. In order to spray between pipes which are set up in a Chinese diamond arrangement, these planes have to form angles with respect to the plane of symmetry of the pipe bundles which are 90, 30 and 150. They thus form angles c~, ~ and y with each other of 60.
As the supports 5, 6, 7 are oriented along the planes in which the nozzles 40 spray, supports 6 and 7 stand at an angle with respect to auxiliary drive shaft 8. Consequently gearwheels 29 and 30 of nozzle holders 26 and 27 and the gearwheels 20 on the auxiliary drive shaft 8 which mesh with these gearwheels have bevelled teeth.
Both the drive of the rotating nozzle holders 25, 26 and 27 and the high pressure fluid supply is by one and the same rigid high pressure line 10. The nozzle holders 25, 26 and 27 can as well as being rotated always in the sam~ sPns~,be oscillated for example through 180.
C)utside the steam generator, line 10 can be connected to a known device in order to give it together with the carrier an intermittent motion, so that with every stop the nozzles 20 of the three nozzle holders 25, 26 and 27 can spray between rows of pipes.
The device is fairly simple in construction and easy to operate.
The fact that the gearwheels are mounted on the drive shaft so that they are detachable and that the supports are detachable from the carrier makes it possible install relatively quickly one, two, three or more nozzle holders at every desired angle with respect to the plane of symmetry of the pipes. Consequently both heat exchangers in which the pipes are arran~ed in a square as well as those in which they are arrranged in a Chinese diamond can be cleaned.
The invention is by no means restricted to the embodiment de-- scribed above and many dif~erent changes can be made to the described embodiment within the context of the patent application, including with , respect to the shape, the composition, l he layout and the number of parts used for the realization of the invention.
In particular the number of supports with their associated nozzle holders is not limited to three. More or less than three supports may 5 be mounted.
Angles , ~ and y need not necessarily be 60 and need not necessarily all be the same.
As the gearwheels on the auxiliary drive shaft and the supports are fastened so that they are detachable, the sequence of the supports 10 and the type (depending on the angle) can be easily changed.
The drive of the auxiliary shaft need not necessarily be performed by means of high pressure hoses. The drive can be performed directly or through a transmission by a motor mounted on the carrier or from outside the heat exchanger requiring cleaning, by 15 means of a flexible shaft.
The number of nozzles~ on each nozzle holder need not necessarily be four~ Nozzles may also be spaced in the direction of the axis of rotation on the holder . I n this way two or more series of nozzles can be located in planes which seen axially with respect to the holder lie at 20 some distance from one another.
: 3A CKGROtJND
The invention concerns a device for cleaning a heat exchanger, specifically a steam generator of the type that comprises:
- a jacket, ~ a pipe bundle installed inside it, in which bundle an open space 5 which opens towards the jacket is provided, through which at least a part of the bundle is accessible, and - at least one access opening in the jacket which leads into the open space, which cleaning device comprises a spray device which itself possesses a : 10 movable carrier and at least one nozzle holder mounted so that it re-volves around a geometrical axis of rotation on this carrier, which nozzle holder contains at least one nozzie whose nozzle opening is radially oriented with respect to the axis of rotation of the nozzle holder, which cleaning device also contains a high pressure line which 15 connects to the spray device at one end and through which liquid under pressure can be conveyed to the nozzle pipe, and a longitudinal guide along which the carrier can be moved.
Steam generators of the aforementioned type are widely used in nuclear power stations. The heating fluid heated in the nuclear reactor 20 is passed through the pipe bundle and gives up heat to a fluid, usually 1 3 1 75 1 ~
water, contained in the space around the pipes, thus generating steam. As a consequence of various chemical reactions an iron oxide, namely magnetite, is generated in the space around the pipe bundle.
This iron oxide is deposited on the pipe bundle, on the bearing plates 5 which support the pipe bundle and above all on the bottom. This iron oxide must be rernoved on each occasion"~sually annually, the nuclear power station receives maintenance. In connection with the difficulty of gaining access to the steam generator and above all because of the radioactive regime the steam generator cannot be dismantled, so that ~0 special installations are necessary for the removal of the sludge, and the iron oxide in particular.
Steam generators are known in which the pipes in the bundle are set up in a so-called Chinese diamond configuration and are thus located at the point of intersection of a network formed by !ines which 15 are not perpendicular to one another and are at an angle with the aforementioned plane of symmetry. Such steam generators are used among other places in KWU nuclear plants ( Kraftwerk-Union plants) .
In these known generators every pipe can be considered as forming part of three rows of pipes, namely one row of pipes which is 20 perpendicular to the plane of symmetry between the parts of the bundle, one row which lies at an angle of 30 to one side of this sym-metrical plane and a third row which lies at an angle of 30 to the ` 1317512 other side of this symmetrical plane. Between the pipes of a bundle section there are thus~also spaces which extend in three directions and in order to clean such a pipe bundle spraying is necessary in three directions, namely in those directions which form angles of 30, 90, 150 with the plane of symmetry. The spaces between the pipes which are at right angles to the aforementioned plane of symmetry are indeed quite narrow and cleaning by spraying into these spaces only would be insufficient .
Devices of the type referred to here are amongst others suited to cleanir4y steam generators of this sort.
Such a device is known from Belgian patent no. 900 . 716 .
In the device according to this patent the carrier contains a crab which runs over a guide and the wheels of which are driven by a flexible shaft from outside the steam generator.
The crab also comprises a turntable which can turn about a vertical axis and can be rotated by a cable and locked into various positions by a pawl attached to a flexible cable. Both these cables extend through a hole in the wall of the generator and are also operated from outside the generator.
The nozzle holcler mounted on the turntable is driven by means of a rotating clutch and a compressed air motor installed on the turntable.
The compressed air line for the compressed air motor and the high 1 3 1 1 5 1 ?
pressure hose also run through the same opening to the outside.
The known device is however rather complicated in constructio.n.
THE INVENTION
The object of the invention is to overcome these disadvantages and to provide a device for cleaning a heat exchanger which is simple in construc~ion, particularly suited for cleaning steam generators in which the pipes are set up in a diamond configuration and which allow relatively fast cleaning without risking damage to the pipes both for similar and for other heat exchangers.
To this end the spray device comprises at least one support which extends beyond the carrier, the nozzle holder is borne in the support so that it can rotate, the carrier and the support are jointly provided with a fluid channel that connects the end of the high pres-sure line to the nozzle holder and thus the nozzle as well, and the 15 cleaning device comprises an auxiliary drive shaft which is borne in the carrier, means for driving the auxiliary drive shaft and a transmission between the auxiliary drive shaft and the nozzle holder.
I n a noteworthy embodiment of the invention the transmission between the auxiliary drive shaft and the nozzle holder is a geared 20 ~ransmission containing a gearwheel mounted on the auxiliary drive shaft and a gearwheel affixed to the nozzle holder.
131~512 In a special embodiment of the invention the device comprises a transmission between the means for driving the auxiliary driving shaft and this auxiliary drive shaft.
The high pres~ure line can by preference be rotated with respect 5 to the carrier and forrns part of the means for driving the auxiliary drive shaft and the transmission between these means and the auxiliary drive shaft is mounted between the latter and the high pressure line.
In an advantageous embodiment of the invention the auxiliary drive shaft is borne by the support.
10In another noteworthy embodiment of the invention the device comprises at least two supports, two nozzle holders which are respec-~; tively borne by the supports and at least two transmissions between the auxiliary drive shaft and the nozzle holders respectively.
The device contains by preference three nozzle holders.
15In an advantageous embodiment of the invention the support of the nozzle holder is detachably mounted on the carrier.
Other particularities and advantages of the invention will be apparent from the description given below of a device for the cleaning of a heat exchanger accordin~ to the invention; this description is only 20 given as an example and by no means restricts the invention; the reference numbers refer to the attached drawings.
~ 7 ~ 1 3 1 7 5 1 2 DRAW:[NGS
Figure l is a side elevation of a cleaning device according to the invention and is partially cut away.
Figure 2 shows a cross section along the line l l-l l shown in 5 figu re l .
Figure 3 is a bottom view of the device in figure l in which the places of two nozzle holders have been interchanged.
In the various figures the same reference numi~ers refer to the same elements.
DESCRIPTION OF A PREFERRED EMBODIMENT
The cleaning device according to the figures is known for cleaning a steam generator in which the pipes are set up in the so-called Chinese diamond arrangement.
The device comprises a longitudinal guide 1 which is installed so 15 that it passes through openings in the wall of the steam generator (not shown) and is supported in a known way.
This guide 1 is a square section. A slot 21 with a mushroom shaped cross section extends over the entire length in each side.
The device also contains a carrier which comprises a body 2 and 20 a guide piece 3 which is attached by means of connectin~ pieces 4 to the body 2. Thls guide piece 3 has a mushroom-shaped section and slides into one of the slides 21 of guide 1 so that carrier 2, 3, 4 can slide along guide 1.
Three supports 5, 6 and 7 are detachably attached by means of bolts 42 to body 2 and protrude out of it on the side opposite the guide piece. An auxiliary drive shaft 8 is borne by the three supports 5, 6 and 7. A high pressure channel 9 which runs through the body 2 5 connects at the site of a chamber 11 formed in body 2 to a rigid high pressure line 10 rotatably mounted on one end of body 2~
The high pressure line 10 is directed in accordance with the travelling device of the carrier, and thus along the longitudinal direc-tion of guide 1.
The high pressure line 10 may consist of several pieces which can be screwed into one another.
Figure I shows only the end of the end-piece of this line 10 which connects to body 2. The extreme end of the high pressure line 10 is retained in chamber 11 of carrier 2, 3, 4 so that it can rotate and l~ yet not leak by a collar 12, which with the help of a back-up ring 13, hooks behind a short round pipe 15 which encircles the line 10 and which is mounted in a cover plate 16 which is fixed on carrier 2 by means of bolts 17 and which mark off chamber 11. A sealing ring 14 encircles the end of line 10.
The sealing ring 14 serves to prevent the high pressure !iquid, which flows from the high pressure line 10 into the high pressure channel 9 of carrier 2, 3 4, penetrating into chamber 11.
At the extreme end of the~high pressure line 10 a gearwheel 18 is mounted between collar 12 and ring 14.
The auxiliary drive shaft 8 which is also directed in the direction of movement of the carrier is borne by means oF a bearing 23 in a wall of chamber 11 and is mounted by means of bearings 24 in supports 5, 6, and 7. A gearwheel 19 permanently mounted on auxiiiary drive shaft 8: and three gearwheels~ 20 are detachably mounted on it. The gearwheels 20 are locked by small screws 43 on the auxiliary drive shaft.
The first gearwheei 19 meshes in the :gearwheel 18 on the high pressure line 10.
The three gearwheels 20 mesh respectively in gearwheels 28, 29 and 30 which are mounted on no2zle hoiders 25, 26 and 27.
Each of the three nozzle holders 25, 26 and 27 comprises a holl-w shaft 31 which forms part of each of them and by which they are borne in one of the supports by means of a bearing 32.
The three nozzle holders 25, 26 and 27 can thus be driven from outside the steam generator by means of the rigid high pressure line 10, a first geared transmission between the high pressure line 10 and the auxiliary shaft 8, consisting of the gearwheel 18 on the high pres-sure line 10 and the gearwheel 19 at the extrerne end of the auxiliary drive shaft 8 in the chamber 11, the auxiliary drive shaft 8 and a second geared transmission between this auxiliary drive shaft 8 and each of the nozzle holders 25, 26 and 27 and consisting of a gearwheel 20 on the auxiliary drive shaft 8 and a gearwheel 28, 29 or 30 of the respective no~zle holder 25, 26 and 27.
The geometrical axes of rotation of the hollow shafts 31 all lie in the same plane, parallel to the direction of movement of the carrier.
The carrier 2, 3, 4 is also provided with three side channels 34, one per nozzle holder, which are mounted at right angles with respect to the high pressure channel 9 and which open into it.
A channel 35 in each support 5, 6 or 7 connects a side channel 34 in the body 2 with a chamber 36 which is an expansion of the aper-ture which bears the hollow shaft 31 of the correponding nozzle holder 25, 26 or 27.
The hollow shaft 31 is p~ovid2d at th~ end m the vicinity of chamber 36 with two radial apertures 37 which connect the said chamber 36 to the space in the hollow shaft 31. At the other end the hollow shaft 31 is provided with four apertures 38. These apertures 38 form a connection between the space in the hollow shaft 31 and four threa~ed apertures 39 in which a nozzle 40 is screwed.
~317512 Two seals 33 and a seal piece 22 ensure the sealing of the holtow shaft 31 .
Liquid under high pressure flows from outside the steam yenerator through the high pressure line 10, the high pressure channel 9, the side channels 34, the channels 35 in the supports S, 6, and 7 the chamber 36, the radial apertures 37, the hollow shafts 31 and aperl:ures 38 and 39 to the apertures 41 of the nozzles and from there spray between the pipes of the steam generator~
As is especially apparent from figure 3 the supports 5, 6 7 stand at an angle with respect to one another.
As the nozzles 40 are radially oriented with respect to the geo-metrical axis of rotation of their nozzle holders 25, 26, and 27 they turn in planes which are perpendicular to the plane throuyh this geo-metrical axis of rotation. In order to spray between pipes which are set up in a Chinese diamond arrangement, these planes have to form angles with respect to the plane of symmetry of the pipe bundles which are 90, 30 and 150. They thus form angles c~, ~ and y with each other of 60.
As the supports 5, 6, 7 are oriented along the planes in which the nozzles 40 spray, supports 6 and 7 stand at an angle with respect to auxiliary drive shaft 8. Consequently gearwheels 29 and 30 of nozzle holders 26 and 27 and the gearwheels 20 on the auxiliary drive shaft 8 which mesh with these gearwheels have bevelled teeth.
Both the drive of the rotating nozzle holders 25, 26 and 27 and the high pressure fluid supply is by one and the same rigid high pressure line 10. The nozzle holders 25, 26 and 27 can as well as being rotated always in the sam~ sPns~,be oscillated for example through 180.
C)utside the steam generator, line 10 can be connected to a known device in order to give it together with the carrier an intermittent motion, so that with every stop the nozzles 20 of the three nozzle holders 25, 26 and 27 can spray between rows of pipes.
The device is fairly simple in construction and easy to operate.
The fact that the gearwheels are mounted on the drive shaft so that they are detachable and that the supports are detachable from the carrier makes it possible install relatively quickly one, two, three or more nozzle holders at every desired angle with respect to the plane of symmetry of the pipes. Consequently both heat exchangers in which the pipes are arran~ed in a square as well as those in which they are arrranged in a Chinese diamond can be cleaned.
The invention is by no means restricted to the embodiment de-- scribed above and many dif~erent changes can be made to the described embodiment within the context of the patent application, including with , respect to the shape, the composition, l he layout and the number of parts used for the realization of the invention.
In particular the number of supports with their associated nozzle holders is not limited to three. More or less than three supports may 5 be mounted.
Angles , ~ and y need not necessarily be 60 and need not necessarily all be the same.
As the gearwheels on the auxiliary drive shaft and the supports are fastened so that they are detachable, the sequence of the supports 10 and the type (depending on the angle) can be easily changed.
The drive of the auxiliary shaft need not necessarily be performed by means of high pressure hoses. The drive can be performed directly or through a transmission by a motor mounted on the carrier or from outside the heat exchanger requiring cleaning, by 15 means of a flexible shaft.
The number of nozzles~ on each nozzle holder need not necessarily be four~ Nozzles may also be spaced in the direction of the axis of rotation on the holder . I n this way two or more series of nozzles can be located in planes which seen axially with respect to the holder lie at 20 some distance from one another.
Claims (20)
1. A device for cleaning a heat exchanger, specifically a steam generator of the type that comprises :
- a jacket, - a pipe bundle installed inside this, in which bundle an open space which opens towards the jacket is provided through which at least a part of the bundle is accessible, and - at least one access opening in the jacket which leads into the open space, which cleaning device comprises :
- a spray device which itself possesses :
-- a movable carrier -- at least one nozzle holder mounted so that it revolves around a geometrical axis of rotation on this carrier, which nozzle holder contains at least one nozzle whose nozzle opening is radially oriented with respect to the axis of rotation of the nozzle holder, -- at least one support which is mounted on the carrier and which extends beyond the carrier,in which support the nozzle holder is rotatably mounted, the carrier and the support being jointly provided with a fluid channel that connects the end of the high pressure line to the nozzle holder and thus the nozzle as well, - a high pressure line which connects to the spray device at one end and through which liquid under pressure can be conveyed to the nozzle, - a longitudinal guide along which the carrier can be moved, - an auxiliary drive shaft which is borne by the carrier, - means for driving the auxiliary drive shaft and - a transmission between the auxiliary drive shaft and the nozzle holder.
- a jacket, - a pipe bundle installed inside this, in which bundle an open space which opens towards the jacket is provided through which at least a part of the bundle is accessible, and - at least one access opening in the jacket which leads into the open space, which cleaning device comprises :
- a spray device which itself possesses :
-- a movable carrier -- at least one nozzle holder mounted so that it revolves around a geometrical axis of rotation on this carrier, which nozzle holder contains at least one nozzle whose nozzle opening is radially oriented with respect to the axis of rotation of the nozzle holder, -- at least one support which is mounted on the carrier and which extends beyond the carrier,in which support the nozzle holder is rotatably mounted, the carrier and the support being jointly provided with a fluid channel that connects the end of the high pressure line to the nozzle holder and thus the nozzle as well, - a high pressure line which connects to the spray device at one end and through which liquid under pressure can be conveyed to the nozzle, - a longitudinal guide along which the carrier can be moved, - an auxiliary drive shaft which is borne by the carrier, - means for driving the auxiliary drive shaft and - a transmission between the auxiliary drive shaft and the nozzle holder.
2. The device according to claim 1, in which the transmission between the auxiliary drive shaft and the nozzle hodler is a geared transmission containing a gearwheel mounted on the auxiliary drive shaft and a gearwheel affixed to the nozzle holder.
3. The device according to claim 1, which further contains a transmission between the means for driving the auxiliary drive shaft and this auxiliary drive shaft.
4. The device according to claim 1, in which the high pressure line is rotatably mounted with respect to the carrier and forms part of the means for driving the auxiliary drive shaft,the device comprises a trans-mission between these high pressure line and the auxiliary drive shaft.
5. The device according to claim 1, in which the high pressure line is rotatably mounted with respect to the carrier and forms part of the means for driving the auxiliary drive shaft, a geared transmission which comprises a gearwheel mounted on the high pressure line and a gearwheel mounted on the auxiliary drive shaft being mounted between the high pressure line and the auxiliary drive shaft.
6. The device according to claim 1, in which the auxiliary drive shaft is borne by the support.
7. The device according to claim 1, in which the nozzle holder contains a hollow shaft coaxial with the geometrical axis of rotation with which shaft it bears in the support , which hollow shaft connects the fluid channel with the nozzle.
8. The device according to claim 7, in which the hollow shaft from the nozzle holder is provided at one end with at least one radial aperture which connects the hollow shaft with the fluid channel and is provided at the other end with at least one radial opening which leads into the nozzle.
9. The device according to claim 7, in which the fluid channel comprises a chamber which encircles the hollow shaft in the support and into which the radial aperture which connects this shaft to the fluid channel leads, and a channel which connects the chamber and which extends through the support.
10. The device according to claim 1, in which the nozzle holder contains four nozzles.
11. The device according to claim 1, which contains at least two supports, two nozzle holders which are borne in respectively one of the supports, and at least two transmissions between the auxiliary drive shaft and the nozzle holders respectively.
12. The device according to claim 1, which contains three nozzle holders.
13. The device according to claim 1,which comprises at least two nozzle holders, the axes of rotation of which lie in the same plane.
14. The device according to claim 1,which comprises three nozzle holders ,the planes perpendicular to the axes of rotation of said nozzle holders forming an angle with respect to one another.
15. The device according to claim 1, which comprises three nozzle holders, the planes perpendicular to the axes of rotation of said nozzle holder forming angles of 60° with respect to one another.
16. The device according to claim 1, in which the fluid channel contains a longitudinal channel through the carrier , a side channel connecting to it in each support and in each support a side channel connecting to each side channel.
17. The device according to claim 1, in which the support for the nozzle holder is detachably mounted on the bearer.
18. The device according to claim 1, in which the transmission between the auxiliary drive shaft and the nozzle holder comprises a gearwheel on the auxiliary drive shaft which is detachably mounted on this auxiliary drive shaft and a gearwheel affixed to the nozzle holder.
19. The device according to claim 1,in which the guide contains a slot in its longitudinal direction, while the carrier contains a projecting guide piece which can slide in the slot.
20. The device according to claim 1,in which the high pressure line is a rigid pipe.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE08700181 | 1987-02-26 | ||
| BE8700181A BE1000357A4 (en) | 1987-02-26 | 1987-02-26 | An apparatus for cleaning of a heat exchanger. |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1317512C true CA1317512C (en) | 1993-05-11 |
Family
ID=3882533
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000559810A Expired - Fee Related CA1317512C (en) | 1987-02-26 | 1988-02-25 | Device for the cleaning of a heat exchanger |
Country Status (3)
| Country | Link |
|---|---|
| BE (1) | BE1000357A4 (en) |
| CA (1) | CA1317512C (en) |
| DE (1) | DE3806004A1 (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE1004430A3 (en) * | 1990-06-22 | 1992-11-17 | Innus Ind Nuclear Service | Device for cleaning a steam generator. |
| FR2684482B1 (en) * | 1991-07-05 | 1994-03-11 | Electricite De France | INTERVENTION DEVICE IN A SPACE DELIMITED BY A CYLINDRICAL ENCLOSURE COMPRISING AT LEAST TWO DIAMETERALLY OPPOSED OPENINGS. |
| DE19510558A1 (en) * | 1995-03-23 | 1996-09-26 | Inro Maschinentechnik Gmbh | Cleaner for heat exchanger elements |
| FR2738053B1 (en) * | 1995-08-25 | 1997-11-07 | Sra Savac | INSTALLATION FOR CLEANING A STEAM GENERATOR WITH A WATER LANCE AND METHOD FOR IMPLEMENTING SAME |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3045978A (en) * | 1960-05-02 | 1962-07-24 | Koppers Co Inc | Tubular boiler or heat exchanger with soot blower |
| EP0084867B1 (en) * | 1982-01-25 | 1985-06-19 | Kraftwerk Union Aktiengesellschaft | Tube lane manipulator for the high pressure removal of sludge from heat exchangers |
| US4620881A (en) * | 1983-08-26 | 1986-11-04 | Innus Industrial Nuclear Services S.A. | Method for cleaning a steam generator |
| US4774975A (en) * | 1984-09-17 | 1988-10-04 | Westinghouse Electric Corp. | Method and apparatus for providing oscillating contaminant-removal stream |
| NL8500296A (en) * | 1984-10-01 | 1986-05-01 | Innus Ind Nuclear Service | DEVICE FOR CLEANING A STEAM GENERATOR. |
| FR2577035B1 (en) * | 1985-02-05 | 1987-03-20 | Thome Emmanuel | TOOL FOR THE DESTRUCTION OF SLUDGE FORMED IN STEAM GENERATORS OF NUCLEAR PRESSURIZED WATER REACTORS |
| EP0195994A3 (en) * | 1985-03-29 | 1987-02-04 | Siemens Aktiengesellschaft | Manipulator for a tube lane for high-pressure de-sludging in a heat exchanger |
| BE902956A (en) * | 1985-07-23 | 1985-11-18 | Booy Clean Wallonie S A | Spray lance to clean tube plate of vertical steam generator drum - to insert via access opening in drum wall has radial-orifice nozzle member driven to rotate on horizontal axis |
-
1987
- 1987-02-26 BE BE8700181A patent/BE1000357A4/en not_active IP Right Cessation
-
1988
- 1988-02-25 DE DE19883806004 patent/DE3806004A1/en not_active Withdrawn
- 1988-02-25 CA CA000559810A patent/CA1317512C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BE1000357A4 (en) | 1988-11-08 |
| DE3806004A1 (en) | 1988-09-08 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |