EP0172244B1 - Installation for cleaning heat exchange surfaces of storage masses in circulation regenerative heat exchangers - Google Patents

Installation for cleaning heat exchange surfaces of storage masses in circulation regenerative heat exchangers Download PDF

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Publication number
EP0172244B1
EP0172244B1 EP85901403A EP85901403A EP0172244B1 EP 0172244 B1 EP0172244 B1 EP 0172244B1 EP 85901403 A EP85901403 A EP 85901403A EP 85901403 A EP85901403 A EP 85901403A EP 0172244 B1 EP0172244 B1 EP 0172244B1
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EP
European Patent Office
Prior art keywords
tube
nozzles
heat exchanger
storage element
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.)
Expired
Application number
EP85901403A
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German (de)
French (fr)
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EP0172244A1 (en
Inventor
Martin Frauenfeld
Georg Goldschmidt
Horst Huber
Karlheinz Mock
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Svenska Rotor Maskiner AB
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Svenska Rotor Maskiner AB
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Publication of EP0172244A1 publication Critical patent/EP0172244A1/en
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    • 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
    • F28G9/00—Cleaning by flushing or washing, e.g. with chemical solvents
    • F28G9/005—Cleaning by flushing or washing, e.g. with chemical solvents of regenerative heat exchanger
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S165/00—Heat exchange
    • Y10S165/009—Heat exchange having a solid heat storage mass for absorbing heat from one fluid and releasing it to another, i.e. regenerator
    • Y10S165/01—Cleaning storage mass
    • Y10S165/011—Reciprocating cleaner device, e.g. scraper, sprayer

Definitions

  • the invention relates to a device for cleaning the heat-exchanging surfaces of the storage masses of circulating regenerative heat exchangers with at least one row next to one another, essentially tangentially oriented with respect to the axis of rotation of the heat exchanger and radially movable back and forth by a drive in front of the end face of the storage mass in the interior of the heat exchanger a carrier of arranged nozzles that move them from an external source of detergent via movable. Guide the connection agent to the storage mass and the cleaning agent supplied to the fixed media lines.
  • the high-pressure cleaning nozzles emit sharp, punctiform impinging cleaning jets which, in their entirety, cause the heating surfaces to be impacted and flexing, which means that firmly adhering, poorly water-soluble incrustations and deposits are blasted off and crushed.
  • the high-pressure nozzles designed for higher liquid throughput were connected downstream of low-pressure flushing nozzles and preferably also arranged in a plane parallel to the high-pressure nozzles.
  • the nozzles are arranged on a trolley, which is moved radially above the end face of the storage mass during the cleaning process.
  • the intensive cleaning process requires cleaning to be carried out with the heat exchanger out of operation.
  • injector nozzles for a gas under low to medium pressure or gas or vaporous cleaning agent in the direction of the emerging nozzle jet to connect injector pipes in such a way that they suck the surrounding heat-exchanging gaseous medium into the pipe and, with the cleaning agent mixed, aligned jets with a speed profile that is balanced over the injector cross-section feed the through-channels between the heat-exchanging surfaces (DE-A-26 15 433).
  • Superheated steam with a pressure of at least 4 atm and a temperature of approximately 300 ° C. is preferably provided as the blowing medium.
  • a series of high-pressure nozzles have already been connected downstream of the injector nozzles or these have been arranged within the injector tubes in the region of their outlet mouth.
  • such a device can be used at different times to use the dissolving and blowing process on the one hand as a regular daily cleaning to remove light soiling and on the other hand the high pressure cleaning process alone or combined with the injector nozzles as cleaning at longer intervals to remove heavy soiling .
  • the water jets emitted by the high-pressure nozzles jump off the deposits from the heating surfaces and shred them, while the gaseous or vaporous detergent mixture supplied by the injector nozzles rinses or blows out the blasted, shredded deposits.
  • the device offers the advantage of both operational cleaning and flushing of the heating surfaces, including the air flowing through the heat exchanger or the flue gas as flushing agent, as a result of the injector action of the flushing medium supplied to the injector nozzles in the form of superheated steam or compressed air.
  • so-called soot blowers are known for cleaning boiler heating surfaces, in which a pair of nozzles is arranged on a blowing lance, with which a cooling water stream is first applied to the incrustations through the one nozzle and cracks are formed in these incrustations by embrittlement and contraction, whereupon the another nozzle, a pulsed high-speed stream is sprayed, which drives water into the cracks formed in the incrustation and causes the incrustations to flake off due to the explosive force of the water evaporating in the cracks (DE-A-32 40 721).
  • One nozzle of the pair of nozzles is connected to a coaxial outer tube and the other to an inner tube and the blowing lance is supported on a mechanically moved slide.
  • the nozzles are directed backwards in the direction of the boiler wall, and hose lines are interposed between the room-side fixed connections at the ends of the media lines supplying the water as cleaning medium and the connections provided at the outer end of the moving blowing lance.
  • the connection ends of the hose lines are moved towards and away from one another during the movement of the sootblower, so that the size of their sag during their feed inside the boiler is changed from a maximum to a minimum. Up to the permissible minimum radius of the hose line used, a free choice of the starting position for the movement sequence is possible, while the end position of the connections moved with the slide only depends on the length of the hose line used depends.
  • the invention is based on the object to provide a device for the reliable cleaning of the storage masses of a circulating regenerative heat exchanger, which using both low cleaning and detergent quantities, operational cleaning in the medium or low pressure range, i. H. So under gentle strain on the heating surfaces to be cleaned, as well as with the same equipment - for example on the occasion of a boiler overhaul after a larger inspection interval - external cleaning and flushing in the high and low pressure range is possible.
  • the nozzles are provided on at least two spaced apart nozzle heads of a tube which extends essentially radially over half of the end face of the storage mass and is guided in a sealed manner into the interior of the heat exchanger that the radially inner nozzle head has a smaller number of nozzles than the respective radially outward following nozzle head, that the tube carrying the nozzle heads as an inner tube and an outer tube essentially coaxially surrounding the inner tube as at least in the area of the sealed insertion into the interior of the heat exchanger having double tube is formed, which is connected to two separate external media lines, in which cleaning agents of different or the same type are supplied under different or the same pressure, and that the tubes of the double tube each separately e matched nozzles are connected.
  • the nozzle heads each have a distributor box, connected to the outer tube and substantially at right angles to the tube axis of the storage mass end face, for the cleaning agent of lower pressure and / or a larger amount supplied in the outer tube, which manifold side through a nozzle plate carrying the assigned nozzles is completed.
  • the nozzles of the nozzle heads assigned to the cleaning medium supplied via the inner tube are expediently connected to the inner tube via a branch line which is routed outside the wall of the outer tube and the distribution box, it being possible for the nozzle plate of the distribution box to be supplemented by a further nozzle plate, in which one with the Branch pipe-connected cavity for distributing the cleaning agent of higher pressure and / or a smaller amount is formed on the nozzle (s) arranged on the storage mass side on the further nozzle plate.
  • the movable connecting means are expediently connected to the double pipe carrying the nozzle heads on the one hand and to the room-side fixed connections of the media lines.
  • H. pressure-resistant hoses which are guided and / or held by support means in such a way that their outer end sections are essentially parallel and straight, while the inner middle section connecting the outer end sections is guided on an approximately semicircular arc.
  • the support means can under or overlap one of the two outer end sections of the flexible connecting lines that run approximately in a parallel manner, for. B. in the form of a profiled support rail, which lead the sections of the connecting lines, for example, in a vertical plane.
  • the connecting webs connecting the tab elements are expediently designed in such a way that they secure the flexible connecting lines against lateral displacements, which is possible, for example, by bulging out or bulging the connecting webs to match the line cross-sections.
  • a simplification of the connection of the flexible connecting lines to the double pipe and at the same time a reliable support and guidance of the end of the double pipe located outside the heat exchanger can be achieved in that a box-like collector for the cleaning agent or detergents is switched on between the connecting lines and the outer end of the double pipe, for example sliding on runners or on rollers is slidable in the longitudinal direction of the double tube on a rail and is connected to a drive motor via force transmission means, for example a chain, spindle or rack.
  • force transmission means for example a chain, spindle or rack.
  • the motor In the case of a chain drive, the motor is permanently attached, while in the case of a rack and pinion drive, the motor is moved along with the collector and, for this purpose, its electrical supply lines are expediently included in the routing and support of the flexible connecting lines.
  • the switching of the direction of movement in the end positions of the double tube feed can be carried out using conventional limit switches or the like.
  • a cantilevered outwardly projecting support supported on the jacket of the heat exchanger housing for holding the outer end of the tube, its drive and the movable connecting means, i. H. the flexible connecting lines.
  • a radially extending support is expediently also arranged inside the regenerative heat exchanger at a distance from the end face of the storage mass, on which the inner portion of the tube carrying the nozzle heads is guided and held in a rolling or sliding manner is.
  • at least one end of the carrier is expediently held in the housing of the regenerative heat exchanger such that it can be moved longitudinally.
  • the rotating storage mass 1 of the revolving regenerative heat exchanger is enclosed by a housing 3, a partial area of which has an inlet or outlet nozzle.
  • zen 5 is shown for one of the heat-exchanging gaseous media.
  • a carrier 7 projects radially into this housing connection piece 5, starting from the housing jacket, in the direction of the axis of rotation of the revolving regenerative heat exchanger.
  • the carrier 7 is slidably supported on a central guide of the housing 9. It is used to hold and guide a double tube, sealed from the outside, through the housing jacket of the preheater, with an outer tube 11 and an inner tube 13, which is guided in a sliding or rolling manner on support arm 15 on support arm 7.
  • the double pipe has two nozzle heads 17, 19.
  • the jacket-side nozzle head 17 is shown as a distributor box for a plurality of rinsing nozzles and the nozzle head 19 provided in the vicinity of the axis of rotation of the storage mass is shown as a distributor for a pair of nozzles.
  • the nozzle head 17 is provided with a larger number of nozzles than the nozzle head 19.
  • a further outwardly projecting carrier 31 is attached to the housing jacket, which in turn supports the drive of the cleaning device, the outer guides of the double pipe 11, 13 and fiexible connecting lines of the cleaning device carries the cleaning agent supplying media lines 49, 51 including a housing enclosing these flexible connecting lines.
  • the connecting lines each have rectilinear end portions 20, 24 and a central portion 22 connecting the end portions in an arc.
  • FIG. 2 shows the part of the cleaning device arranged outside the heat exchanger housing on a larger scale than the illustration according to FIG. 1.
  • a drive motor 33 is screwed to the carrier 31 and drives a chain 35 which is deflected via a chain wheel held in the bearing 37.
  • a box-shaped collector 39 for the lines supplying the cleaning agent as carrier of the double tube is moved back and forth on a rail 41 between two end positions, the contact 43a arranged near the deflecting chain wheel 37 and the one at the other end of the Stroke provided contact 43b are determined.
  • the collector 39 is provided with rollers 45 which run on the rail 41.
  • the associated flexible connecting line section 24 is connected directly to the inner tube 13, which is passed through the collector 39 for this purpose.
  • the other flexible line section 24 connected via the collector to the annular space between the outer and the inner tube lies behind the line section connected to the inner tube and is connected via a coupling 53 to the collector housing and thus to its interior.
  • the cleaning agent flows to the inside of the collector 39 Entry side opposite exit side, from which the outer tube 11 coaxially surrounds the inner tube 13.
  • the above-mentioned housing enclosing the flexible connecting lines has supports 50, 52 formed on the upper and lower sides of profile rails, which overlap or overlap the end sections 20, 24 of the connecting lines.
  • the connecting lines are guided inside the housing on both sides by tab elements 100 which are pivotally connected at their ends to each other in a chain-like manner and are each connected in pairs by connecting webs (not shown).
  • FIG. 3 shows the nozzle head 17 seen in the axial direction of the double pipe 11, 13 on a larger scale than in FIG. 1.
  • the outer tube 11 of the double tube opens into a distributor box 60 on the front side of the nozzle head in the illustration, while a section of the outer tube which supplies the detergent to further nozzles is connected to the rear side of the distributor box in the illustration.
  • the outer tube 11 has a removable cover 62 which allows access to its interior.
  • the distribution box 60 is divided into an upper and a lower part via the flanges 64, 66.
  • the lower part 61 widens conically in the direction of a lower nozzle plate 68. In the case shown, this lower nozzle plate 68 carries four nozzles 70, 72, 74, 76. Off.
  • the jacket of the outer tube 11 leads in the area of the removable cover 62 in front of the distribution box, a branch line 80 connected to the inner tube 13, which leads the cleaning agent supplied via the inner tube to a further nozzle plate 82 which complements the nozzle plate 68 and which has three nozzles 84, 86 and 88 wears.
  • the interior of the nozzle plate 82 is provided with a cavity, via which the branch line 80 is connected to the nozzles.
  • the nozzle heads are shown with the nozzles pointing downward in association with a storage mass arranged below the cleaning device.
  • an inverted arrangement can also be realized, in which the part of the double pipe, including the nozzle heads, provided inside the housing of the circulating regenerative heat exchanger, instead of hanging on a carrier, is also slid on it and guided with upwardly directed nozzle heads and nozzles provided thereon perform the cleaning of the storage mass from the lower front.
  • FIG. 4 shows the cleaning device according to the invention for heat-exchanging surfaces in connection with a type of revolving regenerative heat exchanger in which the storage mass 201 rests in kinematic reversal of the relationships to the heat exchanger shown in FIG. 1, while air duct stubs 202 lie in front of its opposite end faces circulate one of the heat-exchanging media within the other stationary duct connection 205 connected to the housing.
  • the carrier 31 which is arranged centrally outside the storage mass 201 and supports the cleaning device, is not on a jacket 3 enclosing the storage mass, but rather on a rotating mass inside the hub tube 204 of the storage mass carrier supporting the storage mass 201, the rotating hoods 202 in front of the opposite end faces of the storage mass connecting hub tube 206 supported.
  • the support 7 for supporting the pipes 11, '13 supplying the blowing and rinsing agent, including associated nozzle heads 17, 19, is slidably mounted on the outer wall of the rotary hood 202 via a peripheral guide 9.
  • FIGS. 1 and 2 it is sufficient to refer to the explanation of FIGS. 1 and 2 in order to avoid repetitions, especially since the corresponding parts of the cleaning device according to the invention are given the same reference numerals in FIGS. 1, 2 and 4.
  • Modifications of the construction described can be implemented, which relate both to the number and arrangement of the nozzle heads used and to the design and spatial arrangement of the drive of the double pipe and the spatial position of the flexible connecting lines.
  • the device according to the invention can be used to clean the storage mass both during operation and during downtimes, with the choice of different cleaning or rinsing media with different pressure levels being able to adapt to the particular soiling.
  • the device according to the invention is of particular importance for the operational cleaning of circulating regenerative heat exchangers which are used for reheating the clean gases after the raw gas scrubbing. In this case, the system is blown with low pressure and also flushed with high pressure water during operation.

Abstract

PCT No. PCT/EP85/00058 Sec. 371 Date Aug. 16, 1985 Sec. 102(e) Date Aug. 16, 1985 PCT Filed Feb. 21, 1985 PCT Pub. No. WO85/03768 PCT Pub. Date Aug. 29, 1985.Apparatus for cleaning the heat-exchanging surfaces of the storage elements of rotary regenerative heat exchangers. The apparatus has a row of nozzles oriented substantially at a tangent and in a radially displaceable manner before the end face of the storage element (1) in the interior of the heat exchanger, which cause the cleaning material, delivered to them from a source of cleaning material, to emerge in an aimed manner onto the storage element (1). The nozzles are provided on at least two spaced-apart nozzle heads (19; 17) disposed a tube (11; 13) extending substantially radially over one half of the end face of the storage element (1), the tube being guided into the interior of the heat exchanger in a sealed manner and being movable by a drive means radially back and forth above the storage element (1). Via movable connecting means, the tube (11; 13) is connected to at least one external, stationary material line delivering the cleaning material. The radially inner nozzle head (19), being adapted to the lesser circumferential speed of the heat exchanger in this vicinity, has a lesser number of nozzles than the next nozzle head (17) in radially outward sequence.

Description

Die Erfindung betrifft eine Vorrichtung zur Reinigung der wärmetauschenden Flächen der Speichermassen umlaufender Regenerativ-Wärmetauscher mit mindestens einer Reihe nebeneinander, im wesentlichen bezüglich der Drehachse des Wärmetauschers tangential ausgerichteter und radial durch einen Antrieb hin und her bewegbar vor der Stirnseite der Speichermasse im Innern des Wärmetauschers auf einem Träger angeordneter Düsen, welche das ihnen von einer äußeren Reinigungsmittelquelle über bewegliche . Verbindungsmittel an feststehenden Medienleitungen zugeführte Reinigungsmittel gerichtet auf die Speichermasse führen.The invention relates to a device for cleaning the heat-exchanging surfaces of the storage masses of circulating regenerative heat exchangers with at least one row next to one another, essentially tangentially oriented with respect to the axis of rotation of the heat exchanger and radially movable back and forth by a drive in front of the end face of the storage mass in the interior of the heat exchanger a carrier of arranged nozzles that move them from an external source of detergent via movable. Guide the connection agent to the storage mass and the cleaning agent supplied to the fixed media lines.

Um die sich auf den wärmetauschenden Flächen von Speichermassen in regenerativen Wärmetauschern im Betrieb ansetzenden festhaftenden Beläge zu entfernen und stark verschmutzte und verkrustete Heizflächen, ja sogar durch Verschmutzung vollständig verschlossenen Durchgangskanäle der Speichermassen in ihrem in den Speichermassenträger eingebauten Zustand außerhalb des Betriebes - d. h. während der Stillstandszeiten - zu reinigen, ist eine Vorrichtung bekannt, bei welcher parallel zur Ebene der wärmetauschenden Flächen Hochdruckdüsen in einer Reihe angeordnet sind, welche mit gerichteten, zylindrische oder flache Düsenstrahlen relativ zur Ebene der im wesentlichen tangential ausgerichteten Austauschflächen verschoben werden (DE-A-25 14 173). Die Hochdruck-Reinigungsdüsen geben scharfe, punktförmig auftreffende Reinigungsstrahlen ab, die in ihrer Gesamtheit eine prallartige und walkende Beanspruchung der Heizflächen bewirkt, wodurch festhaftende, schlecht in Wasser lösliche Verkrustungen und Beläge abgesprengt und zerkleinert werden. Für die zuverlässige Entfernung der durch die Hochdruckdüsen gelösten bzw. zerkleinerten und teilweise im Wasser unlöslichen festen Verunreinigungen wurden den Hochdruckdüsen auf höheren Flüssigkeitsdurchsatz ausgelegte Niederdruck Spüldüsen nachgeschaltet und vorzugsweise gleichfalls in einer Ebene parallel zu den Hochdruckdüsen angeordnet. Die Düsen werden dabei an einem Wagen angeordnet, der beim Reinigungsvorgang oberhalb der Speichermassen-Stirnfläche radial verfahren wird. Der intensive Reinigungsvorgang erfordert jedoch die Durchführung der Reinigung bei außer Betrieb genommenem Wärmetauscher.In order to remove the adhering deposits that accumulate on the heat-exchanging surfaces of storage masses in regenerative heat exchangers during operation and heavily soiled and encrusted heating surfaces, even through-channels of the storage masses that are completely closed by soiling in their state installed outside of the operation in the storage mass carrier - d. H. During the downtimes - to clean, a device is known in which high-pressure nozzles are arranged in a row parallel to the plane of the heat-exchanging surfaces, which are displaced with directed, cylindrical or flat nozzle jets relative to the plane of the essentially tangentially oriented exchange surfaces (DE-A -25 14 173). The high-pressure cleaning nozzles emit sharp, punctiform impinging cleaning jets which, in their entirety, cause the heating surfaces to be impacted and flexing, which means that firmly adhering, poorly water-soluble incrustations and deposits are blasted off and crushed. For the reliable removal of the solid contaminants dissolved or comminuted by the high-pressure nozzles and partially insoluble in water, the high-pressure nozzles designed for higher liquid throughput were connected downstream of low-pressure flushing nozzles and preferably also arranged in a plane parallel to the high-pressure nozzles. The nozzles are arranged on a trolley, which is moved radially above the end face of the storage mass during the cleaning process. However, the intensive cleaning process requires cleaning to be carried out with the heat exchanger out of operation.

In Weiterbildung der vorstehend bekannten Vorrichtung wurde auch bereits vorgeschlagen, Injektordüsen für ein unter niedrigem bis mittleren Druck stehendes Gas oder gas-bzw. dampfförmiges Reinigungsmittel in Richtung des austretenden Düsenstrahls Injektorrohre derart nachzuschalten, daß sie das umgebende wärmetauschende gasförmige Medium in das Rohr hinein ansaugen und mit dem Reinigungsmittel vermischt ausgerichtete Strahlen mit über den Injektorquerschnitt ausgeglichendem Geschwindigkeitsprofil den Durchgangskanälen zwischen den wärmetauschenden Flächen zuzuführen (DE-A-26 15 433). Als Blasmedium ist hierbei vorzugsweise überhitzter Dampf mit einem Druck von mindestens 4 atü und einer Temperatur von ca. 300 °C vorgesehen. In Weiterbildung dieser Ausgestaltung wurden den Injektordüsen auch bereits eine Reihe von Hochdruckdüsen nachgeschaltet bzw. diese innerhalb der Injektorrohre im Bereich von deren Austrittsmündung angeordnet. Je nach der Verschmutzungsart und der Belagstärke kann mit einer derartigen Vorrichtung zu unterschiedlichen Zeiten der Lösungs- und Blasvorgang einerseits als regelmäßige tägliche Reinigung zur Beseitigung leichter Verschmutzungen und der Hochdruckreinigungsvorgang andererseits alleine oder mit den Injektordüsen kombiniert als Reinigung in größeren Zeitabständen zur Beseitigung starker Verschmutzungen eingesetzt werden. Bei gleichzeitigem Einsatz der Hochdruck- und der Injektordüsen sprangen die von den Hochdruckdüsen abgegebenen Wasserstrahlen die Beläge von den Heizflächen ab und zerkleinern sie, während das von den Injektordüsen gelieferte gas- bzw. dampfförmige Reinigungsmittelgemisch die abgesprengten, zerkleinerten Beläge ausspült oder -bläst. Die Vorrichtung bietet den Vorteil sowohl der betrieblichen Reinigung als auch Spülung der Heizflächen unter Einbeziehung der den Wärmetauscher durchströmenden Luft oder des Rauchgases als Spülmittel infolge der Injektorwirkung des den Injektordüsen zugeführten Spülmedium in Form von überhitztem Dampf oder Preßluft.In a further development of the device known above, it has also already been proposed to use injector nozzles for a gas under low to medium pressure or gas or vaporous cleaning agent in the direction of the emerging nozzle jet to connect injector pipes in such a way that they suck the surrounding heat-exchanging gaseous medium into the pipe and, with the cleaning agent mixed, aligned jets with a speed profile that is balanced over the injector cross-section feed the through-channels between the heat-exchanging surfaces (DE-A-26 15 433). Superheated steam with a pressure of at least 4 atm and a temperature of approximately 300 ° C. is preferably provided as the blowing medium. In a further development of this embodiment, a series of high-pressure nozzles have already been connected downstream of the injector nozzles or these have been arranged within the injector tubes in the region of their outlet mouth. Depending on the type of contamination and the thickness of the covering, such a device can be used at different times to use the dissolving and blowing process on the one hand as a regular daily cleaning to remove light soiling and on the other hand the high pressure cleaning process alone or combined with the injector nozzles as cleaning at longer intervals to remove heavy soiling . When the high-pressure and injector nozzles are used at the same time, the water jets emitted by the high-pressure nozzles jump off the deposits from the heating surfaces and shred them, while the gaseous or vaporous detergent mixture supplied by the injector nozzles rinses or blows out the blasted, shredded deposits. The device offers the advantage of both operational cleaning and flushing of the heating surfaces, including the air flowing through the heat exchanger or the flue gas as flushing agent, as a result of the injector action of the flushing medium supplied to the injector nozzles in the form of superheated steam or compressed air.

Zur Reinigung von KesselheizfJächen sind andererseits sogenannte Rußbläser bekannt, bei denen ein Düsenpaar auf einer Blaslanze angeordnet ist, mit welchem zunächst ein kühlender Wasserstrom durch die eine Düse auf die Verkrustungen aufgebracht und durch Versprödung und Kontraktion Risse in diesen Verkrustungen gebildet werden, worauf anschließend durch die andere Düse ein gepulster Hochgeschwindigkeitsstrom aufgesprüht wird, welcher Wasser in die gebildeten Risse der Verkrustung hineintreibt und durch die Sprengkraft des in den Rissen verdampfenden Wassers diese Verkrustungen zum Abplatzen bringt (DE-A-32 40 721). Die eine Düse des Düsenpaars ist jeweils an ein koaxial äußeres und die andere an ein inneres Rohr angeschlossen und die Blaslanze auf einem mechanisch bewegten Schlitten abgestützt. Die Düsen sind nach rückwärts in Richtung auf die Kesselwandung gerichtet, und zwischen die raumseitig festen Anschlüsse an den Enden der das Wasser als Reinigungsmedium zuführenden Medienleitungen und die an dem äußeren Ende der bewegten Blaslanze vorgesehenen Anschlüsse sind Schlauchleitungen zwischengeschaltet. Die Anschlußenden der Schlauchleitungen werden während der Bewegung des Rußbläsers aufeinander zu und voneinander weg bewegt, so daß sich die Größe von deren Durchhang während ihres Vorschubs im Innern des Kessels von einem Maximum zu einem Minimum verändert..Bis zum zulässigen Mindestradius der verwendeten Schlauchleitung ist somit eine freie Wahl der Ausgangsposition für den Bewegungsablauf möglich, während die Endposition der mit dem Schlitten bewegten Anschlüsse lediglich von der Länge der verwendeten Schlauchleitung abhängt.On the other hand, so-called soot blowers are known for cleaning boiler heating surfaces, in which a pair of nozzles is arranged on a blowing lance, with which a cooling water stream is first applied to the incrustations through the one nozzle and cracks are formed in these incrustations by embrittlement and contraction, whereupon the another nozzle, a pulsed high-speed stream is sprayed, which drives water into the cracks formed in the incrustation and causes the incrustations to flake off due to the explosive force of the water evaporating in the cracks (DE-A-32 40 721). One nozzle of the pair of nozzles is connected to a coaxial outer tube and the other to an inner tube and the blowing lance is supported on a mechanically moved slide. The nozzles are directed backwards in the direction of the boiler wall, and hose lines are interposed between the room-side fixed connections at the ends of the media lines supplying the water as cleaning medium and the connections provided at the outer end of the moving blowing lance. The connection ends of the hose lines are moved towards and away from one another during the movement of the sootblower, so that the size of their sag during their feed inside the boiler is changed from a maximum to a minimum. Up to the permissible minimum radius of the hose line used, a free choice of the starting position for the movement sequence is possible, while the end position of the connections moved with the slide only depends on the length of the hose line used depends.

Der Erfindung liegt demgegenüber die Aufgabe zugrunde, eine Vorrichtung zur zuverlässigen Reinigung der Speichermassen eines umlaufenden Regenerativ-Wärmetauschers zu schaffen, welche unter Einsatz sowohl geringer Reinigungsals auch Spülmittelmengen eine betriebliche Reinigung im Mittel- bzw. Niederdruckbereich, d. h. also unter schonender Beanspruchung der zu reinigenden Heizflächen, als auch mit der gleichen Einrichtung - beispielsweise anläßlich einer Kessel-Revision nach Ablauf eines größeren Inspektionsintervalls - eine außerbetriebliche Reinigung und Spülung im Hoch- und Niederdruckbereich ermöglicht.The invention is based on the object to provide a device for the reliable cleaning of the storage masses of a circulating regenerative heat exchanger, which using both low cleaning and detergent quantities, operational cleaning in the medium or low pressure range, i. H. So under gentle strain on the heating surfaces to be cleaned, as well as with the same equipment - for example on the occasion of a boiler overhaul after a larger inspection interval - external cleaning and flushing in the high and low pressure range is possible.

Ausgehend von einer Vorrichtung der eingangs erwähnten Art wird diese Aufgabe erfindungsgemäß dadurch gelöst, daß die Düsen an wenigstens zwei mit Abstand voneinander angeordneten Düsenköpfen eines sich im wesentlichen radial über eine Hälfte der Stirnseite der Speichermasse erstreckenden, abgedichtet in den Innenraum des Wärmetauschers geführten Rohrs vorgesehen sind, daß der radial innere Düsenkopf eine geringere Anzahl von Düsen aufweist, als der jeweils radial nach außen nächstfolgende Düsenkopf, daß das die Düsenköpfe tragende Rohr als wenigstens im Bereich der abgedichteten Einführung ins Innere des Wärmetauschers ein Innenrohr und ein das Innenrohr im wesentlichen koaxial umgebendes Außehrohr aufweisendes Doppelrohr ausgebildet ist, welches an zwei getrennte äußere Medienleitungen angeschlossen ist, in welchen Reinigungsmittel unterschiedlicher oder gleicher Art unter unterschiedlichem oder gleichem Druck zugeführt wird, und daß die Rohre des Doppelrohrs jeweils an gesondert angepaßte Düsen angeschlossen sind. Durch Anordnung von wenigstens zwei Düsenköpfen in gleichmäßigen radialen Abständen am Rohr und entsprechende Anpassung der Zahl der Düsen an jedem Düsenkopf läßt sich nicht nur die Reinigungswirkung in den den Düsenköpfen zugeordneten Bereichen der Speichermasse weiter vergleichmäßigen, sondern der Längshub des Rohrs wird auch entsprechend verkürzt, weil mit steigender Zahl von jedem Düsenkopf ein entsprechend schmalerer Ringbereich der Speichermasse gereinigt wird. Die Möglichkeit der Zufuhr von Reinigungsmittel unterschiedlicher oder gleicher Art unter unterschiedlichem oder gleichem Druck über die koaxialen Rohre des Doppelrohrs eröffnet außerdem die Möglichkeit, wahlweise getrennt oder gemeinsam mit geringeren Mengen und von unter hohem Druck stehendem flüssigen Reinigungsmittel auf die Verschmutzungsbeläge einzuwirken und/oder während des Betriebes ständig gleichmäßig mit einem gas- oder dampfförmigen Reinigungsmittel zu spülen.Starting from a device of the type mentioned at the outset, this object is achieved according to the invention in that the nozzles are provided on at least two spaced apart nozzle heads of a tube which extends essentially radially over half of the end face of the storage mass and is guided in a sealed manner into the interior of the heat exchanger that the radially inner nozzle head has a smaller number of nozzles than the respective radially outward following nozzle head, that the tube carrying the nozzle heads as an inner tube and an outer tube essentially coaxially surrounding the inner tube as at least in the area of the sealed insertion into the interior of the heat exchanger having double tube is formed, which is connected to two separate external media lines, in which cleaning agents of different or the same type are supplied under different or the same pressure, and that the tubes of the double tube each separately e matched nozzles are connected. By arranging at least two nozzle heads at uniform radial distances on the tube and correspondingly adapting the number of nozzles on each nozzle head, not only can the cleaning effect in the areas of the storage mass assigned to the nozzle heads be further equalized, but the longitudinal stroke of the tube is also shortened accordingly, because as the number of each nozzle head increases, a correspondingly narrower ring area of the storage mass is cleaned. The possibility of supplying cleaning agents of different or the same type under different or the same pressure via the coaxial tubes of the double tube also opens up the possibility of acting separately or together with smaller amounts and of liquid detergent under high pressure on the contamination deposits and / or during the Flush the company constantly with a gaseous or vaporous cleaning agent.

Die Düsenköpfe weisen in vorteilhafter Weiterbildung der Erfindung jeweils einen an das Außenrohr angeschlossenen, im wesentlichen rechtwinklig zur Rohrachse der Speichermassen-Stirnseite vortretenden Verteilerkasten für das im Außenrohr zugeführte Reinigungsmittel geringeren Drucks und/oder größerer Menge auf, welcher speichermassenseitig durch eine die zugeordneten Düsen tragende Düsenplatte abgeschlossen ist.In an advantageous further development of the invention, the nozzle heads each have a distributor box, connected to the outer tube and substantially at right angles to the tube axis of the storage mass end face, for the cleaning agent of lower pressure and / or a larger amount supplied in the outer tube, which manifold side through a nozzle plate carrying the assigned nozzles is completed.

Die dem über das Innenrohr zugeführten Reinigungsmedium zugeordneten Düsen der Düsenköpfe sind dagegen zweckmäßig über jeweils eine außerhalb der Wandung des Außenrohrs und des Verteilerkastens geführte Zweigleitung an das Innenrohr angeschlossen, wobei die Düsenplatte des Verteilerkastens durch eine weitere Düsenplatte ergänzt sein kann, in welcher ein mit der Zweigleitung verbundener Hohlraum zur Verteilung des Reinigungsmittels höheren Drucks und/oder geringerer Menge auf die speichermassenseitig an der weiteren Düsenplatte angeordnete(n) Düse(n) ausgebildet ist.The nozzles of the nozzle heads assigned to the cleaning medium supplied via the inner tube, on the other hand, are expediently connected to the inner tube via a branch line which is routed outside the wall of the outer tube and the distribution box, it being possible for the nozzle plate of the distribution box to be supplemented by a further nozzle plate, in which one with the Branch pipe-connected cavity for distributing the cleaning agent of higher pressure and / or a smaller amount is formed on the nozzle (s) arranged on the storage mass side on the further nozzle plate.

Die beweglichen Verbindungsmittel werden zweckmäßig von an dem die Düsenköpfe tragenden Doppelrohr einerseits und raumseitig festen Anschlüssen der Medienleitungen angeschlossenen flexiblen Verbindungsleitungen, d. h. druckfesten Schläuchen, gebildet, die von Abstützmitteln so geführt und/oder gehalten sind, daß ihre äußeren Endabschnitte im wesentlichen parallel und geradlinig verlaufen, während der die äußeren Endabschnitte verbindende innere Mittelabschnitt auf einem etwa halbkreisförmigen Bogen geführt ist.The movable connecting means are expediently connected to the double pipe carrying the nozzle heads on the one hand and to the room-side fixed connections of the media lines. H. pressure-resistant hoses, which are guided and / or held by support means in such a way that their outer end sections are essentially parallel and straight, while the inner middle section connecting the outer end sections is guided on an approximately semicircular arc.

Die Abstützmittel können eine jeweils einen der etwa geradlinig parallel geführten beiden äußeren Endabschnitte der flexiblen Verbindungsleitungen unter- bzw. übergreifende Auflage, z. B. in Form einer profilierter Auflageschiene, aufweisen, welche die Abschnitte der Verbindungsleitungen beispielsweise in einer vertikalen Ebene führen.The support means can under or overlap one of the two outer end sections of the flexible connecting lines that run approximately in a parallel manner, for. B. in the form of a profiled support rail, which lead the sections of the connecting lines, for example, in a vertical plane.

Besonders schonend für die das Reinigungsmittel führenden flexiblen Verbindungsleitungen ist eine Ausgestaltung, bei welcher in parallelen Ebenen beidseitig neben den Verbindungsleitungen an ihren Enden jeweils kettenartig verschwenkbar miteinander verbundene Laschenelemente vorgesehen sind, von denen an gegenüberliegenden Seiten der Verbindungsleitungen liegende Laschenelemente jeweils paarweise durch Verbindungsstege zusammengeschlossen sind, welche die flexiblen Verbindungsleitungen zumindest im Bereich ihrer äußeren Krümmungsradien unter- bzw. übergreifen.Particularly gentle on the flexible connecting lines carrying the cleaning agent is an embodiment in which in parallel planes on both sides next to the connecting lines are provided at their ends each chain-like pivotally connected tab elements, of which tab elements lying on opposite sides of the connecting lines are each connected in pairs by connecting webs, which under or overlap the flexible connecting lines at least in the area of their outer radii of curvature.

Die die Laschenelemente verbindenden Verbindungsstege sinddabei zweckmäßig so ausgebildet, daß sie die flexiblen Verbindungsleitungen gegen seitliche Verschiebungen sichern, was beispielsweise durch Aus- bzw. Einwölbungen der Verbindungsstege in Anpassung an die Leitungsquerschnitte möglich ist.The connecting webs connecting the tab elements are expediently designed in such a way that they secure the flexible connecting lines against lateral displacements, which is possible, for example, by bulging out or bulging the connecting webs to match the line cross-sections.

Eine Vereinfachung des Anschlusses der flexiblen Verbindungsleitungen an das Doppelrohr und gleichzeitig eine zuverlässige Abstützung und Führung des außerhalb des Wärmetauschers befindlichen Endes des Doppelrohrs läßt sich dadurch erreichen, daß zwischen den Verbindungsleitungen und dem äußeren Ende des Doppelrohrs ein kastenartiger Sammler für das bzw. die Reinigungsmittel eingeschaltet ist, der beispielsweise auf Kufen gleitend oder auf Rollen in Längsrichtung des Doppelrohrs hin- und herverschiebbar auf einer Schiene geführt ist und über Kraftübertragungsmittel, beispielsweise eine Kette, Spindel oder Zahnstange, mit einem Antriebsmotor verbunden ist. Bei Kettenantrieb ist der Motor fest angebaut, während bei einem Zahnstangenantrieb der Motor mit dem Sammler mitbewegt wird und hierfür zweckmäßig seine elektrischen Versorgungsleitungen in die Führung und Abstützung der flexiblen Verbindungsleitungen einbezogen werden. Die Umschaltung der Bewegungsrichtung in den Endstellungen des Doppelrohr-Vorschubs kann über übliche Endschalter od. dgl. erfolgen.A simplification of the connection of the flexible connecting lines to the double pipe and at the same time a reliable support and guidance of the end of the double pipe located outside the heat exchanger can be achieved in that a box-like collector for the cleaning agent or detergents is switched on between the connecting lines and the outer end of the double pipe, for example sliding on runners or on rollers is slidable in the longitudinal direction of the double tube on a rail and is connected to a drive motor via force transmission means, for example a chain, spindle or rack. In the case of a chain drive, the motor is permanently attached, while in the case of a rack and pinion drive, the motor is moved along with the collector and, for this purpose, its electrical supply lines are expediently included in the routing and support of the flexible connecting lines. The switching of the direction of movement in the end positions of the double tube feed can be carried out using conventional limit switches or the like.

Besonders vorteilhaft für den Ausgleich thermischer Belastungen ist ein freitragend nach außen vorkragender, auf dem Mantel des Wärmetauschergehäuses abgestützter Träger zur Halterung des äußeren Endes des Rohrs, dessen Antrieb und der beweglichen Verbindungsmittel, d. h. der flexiblen Verbindungsleitungen.Particularly advantageous for the compensation of thermal loads is a cantilevered outwardly projecting support supported on the jacket of the heat exchanger housing for holding the outer end of the tube, its drive and the movable connecting means, i. H. the flexible connecting lines.

Bei Regenerativ-Wärmetauschern größerer Leistung und somit größeren Durchmessers der Speichermassen wird zweckmäßig auch im Innern des Regenerativ-Wärmetauschers mit Abstand von der Stirnseite der Speichermasse ein radial verlaufender Träger angeordnet, an welchem der gehäuseinnere Abschnitt des die Düsenköpfe tragenden Rohrs rollend oder gleitend geführt und gehalten ist. Dabei wird zum Ausgleich von Wärmedehnungen zweckmäßig wenigstens das eine Ende des Trägers längsverschieblich im Gehäuse des Regenerativ-Wärmetauschers gehalten.In the case of regenerative heat exchangers of higher output and thus larger diameter of the storage masses, a radially extending support is expediently also arranged inside the regenerative heat exchanger at a distance from the end face of the storage mass, on which the inner portion of the tube carrying the nozzle heads is guided and held in a rolling or sliding manner is. In order to compensate for thermal expansions, at least one end of the carrier is expediently held in the housing of the regenerative heat exchanger such that it can be moved longitudinally.

Die Erfindung ist in der folgenden Beschreibung zweier Ausführungsbeispiele in Verbindung mit der Zeichnun näher erläutert, und zwar zeigt :

  • Fig. 1 einen Vertikalschnitt durch einen Teilbereich eines Regenerativ-Wärmetauschers mit feststehendem Gehäuse und umlaufender Speichermasse an dessen Gehäuse die erfindungsgemäße Reinigungsvorrichtung angebaut ist ;
  • Fig. 2 eine teilweise aufgebrochene Seitenansicht des außerhalb des Wärmetauschergehäuses befindlichen Teils der Reinigungsvorrichtung in vergrößertem Maßstab ;
  • Fig. 3 eine in Richtung der Längsmittelachse des Doppelrohrs gesehene Ansicht eines Düsenkopfs der Reinigungsvorrichtung ; und
  • Fig. 4 einen der Fig. 1 ähnlichen Vertikalschnitt durch einen Teilbereich eines mit einer erfindungsgemäßen Reinigungsvorrichtung ausgerüsteten Regenerativ-Wärmetauschers mit feststehender Speichermasse und umlaufen Drehhauben.
The invention is explained in more detail in the following description of two exemplary embodiments in conjunction with the drawing, which shows:
  • Figure 1 is a vertical section through a portion of a regenerative heat exchanger with a fixed housing and circumferential storage mass on the housing, the cleaning device according to the invention is attached.
  • Figure 2 is a partially broken side view of the part of the cleaning device located outside the heat exchanger housing on an enlarged scale.
  • 3 shows a view of a nozzle head of the cleaning device, seen in the direction of the longitudinal central axis of the double pipe; and
  • Fig. 4 is a vertical section similar to Fig. 1 through a portion of a regenerative heat exchanger equipped with a cleaning device according to the invention with a fixed storage mass and rotating hoods.

Entsprechend dem in Fig. 1 dargestellten Vertikalschnitt ist die rotierende Speichermasse 1 des umlaufenden Regenerativ-Wärmetauschers von einem Gehäuse 3 umschlossen, von dem ein Teilbereich mit einem Eintritts- oder Austrittsstut-. zen 5 für eines der wärmetauschenden gasförmigen Medien dargestellt ist. In diesen Gehäusestutzen 5 ragt - ausgehend von dem Gehäusemantel - ein Träger 7 radial in Richtung auf die Drehachse des umlaufenden Regenerativ-Wärmetauschers. Der Träger 7 ist auf einer zentralen Führung des Gehäuses 9 gleitend abgestützt. Er dient zur Halterung und Führung eines von außen abgedichtet durch den Gehäusemantel des Vorwärmers hindurchgeführten Doppelrohrs mit einem Außenrohr 11 und einem Innenrohr 13, welches gleitend oder rollend über Abstützmittel 15 am Tragarm 7 geführt ist. Das Doppelrohr weist zwei Düsenköpfe 17,19 auf. Der mantelseitige Düsenkopf 17 ist als Verteilerkasten für mehrere Spüldüsen und der in der Nähe der Drehachse der Speichermasse vorgesehene Düsenkopf 19 als Verteiler für ein Düsenpaar dargestellt, d. h. der Düsenkopf 17 ist mit einer größeren Anzahl von Düsen versehen als der Düsenkopf 19. Auf dem Gehäusemantel ist ein weiterer nach außen kragender Träger 31 angebracht, der seinerseits den Antrieb der Reinigungsvorrichtung, die äußeren Führungen des Doppelrohrs 11, 13 und fiexible Verbindungsleitungen der Reinigungsvorrichtung mit die Reinigungsmittel zuführenden Medienleitungen 49, 51 einschließlich eines diese flexiblen Verbindungsleitungen umschließenden Gehäuses trägt. Die Verbindungsleitungen weisen jeweils geradlinig im Gehäuse geführte Endabschnitte 20, 24 und einen die Endabschnitte bogenförmig verbindenden Mittelabschnitt 22 auf.According to the vertical section shown in FIG. 1, the rotating storage mass 1 of the revolving regenerative heat exchanger is enclosed by a housing 3, a partial area of which has an inlet or outlet nozzle. zen 5 is shown for one of the heat-exchanging gaseous media. A carrier 7 projects radially into this housing connection piece 5, starting from the housing jacket, in the direction of the axis of rotation of the revolving regenerative heat exchanger. The carrier 7 is slidably supported on a central guide of the housing 9. It is used to hold and guide a double tube, sealed from the outside, through the housing jacket of the preheater, with an outer tube 11 and an inner tube 13, which is guided in a sliding or rolling manner on support arm 15 on support arm 7. The double pipe has two nozzle heads 17, 19. The jacket-side nozzle head 17 is shown as a distributor box for a plurality of rinsing nozzles and the nozzle head 19 provided in the vicinity of the axis of rotation of the storage mass is shown as a distributor for a pair of nozzles. H. the nozzle head 17 is provided with a larger number of nozzles than the nozzle head 19. A further outwardly projecting carrier 31 is attached to the housing jacket, which in turn supports the drive of the cleaning device, the outer guides of the double pipe 11, 13 and fiexible connecting lines of the cleaning device carries the cleaning agent supplying media lines 49, 51 including a housing enclosing these flexible connecting lines. The connecting lines each have rectilinear end portions 20, 24 and a central portion 22 connecting the end portions in an arc.

In Fig. 2 ist der außerhalb des Wärmetauschergehäuses angeordnete Teil der Reinigungsvorrichtung in einem gegenüber der Darstellung gemäß Fig. 1 vergrößerten Maßstab dargestellt. Mit dem Träger 31 ist ein Antriebsmotor 33 verschraubt, der eine Kette 35 antreibt, die über ein im Lager 37 gehaltertes Kettenrad umgelenkt wird. Mittels der Kette 35 wird ein kastenförmiger Sammler 39 für die das Reinigungsmittel zuführenden Leitungen als Träger des Doppelrohrs auf einer Schiene 41 zwischen zwei Endpositionen hin- und herbewegt, die von dem in der Nähe des umlenkende Kettenrades 37 angeordneten Kontakt 43a und den am anderen Ende des Hubweges vorgesehenen Kontakt 43b bestimmt werden. Der Sammler 39 ist mit Rollen 45 versehen, welche auf der Schiene 41 laufen. Über eine Kupplung 47 erfolgt in der Achse des Innenrohrs 13 der Anschluß des zugehörigen flexiblen Verbindungsleitungsabschnitts 24 direkt an das Innenrohr 13, welches zu diesem Zweck durch den Sammler 39 hindurchgeführt ist. Der über den Sammler mit dem Ringraum zwischen dem Außen- und dem Innenrohr verbundene andere flexible Leitungsabschnitt 24 liegt in der Darstellung hinter dem mit dem Innenrohr verbundenen Leitungsabschnitt und ist über eine Kupplung 53 an das Sammlergehäuse und damit an dessen Innenraum angeschlossen. Über den Innenraum des Sammlers 39 fließt das Reinigungsmittel zu der der Eintrittsseite gegenüberliegenden Austrittsseite, von welcher das das Innenrohr 13 koaxial umschließende Außenrohr 11 ausgeht.FIG. 2 shows the part of the cleaning device arranged outside the heat exchanger housing on a larger scale than the illustration according to FIG. 1. A drive motor 33 is screwed to the carrier 31 and drives a chain 35 which is deflected via a chain wheel held in the bearing 37. By means of the chain 35, a box-shaped collector 39 for the lines supplying the cleaning agent as carrier of the double tube is moved back and forth on a rail 41 between two end positions, the contact 43a arranged near the deflecting chain wheel 37 and the one at the other end of the Stroke provided contact 43b are determined. The collector 39 is provided with rollers 45 which run on the rail 41. Via a coupling 47 in the axis of the inner tube 13, the associated flexible connecting line section 24 is connected directly to the inner tube 13, which is passed through the collector 39 for this purpose. The other flexible line section 24 connected via the collector to the annular space between the outer and the inner tube lies behind the line section connected to the inner tube and is connected via a coupling 53 to the collector housing and thus to its interior. The cleaning agent flows to the inside of the collector 39 Entry side opposite exit side, from which the outer tube 11 coaxially surrounds the inner tube 13.

Das obenerwähnte, die flexiblen Verbindungsleitungen umschließende Gehäuse weist an der Unter- und Oberseite von Profilschienen gebildete Auflagen 50, 52 auf, welche die Endabschnitte 20, 24 der Verbindungsleitungen unter- bzw. übergreifen. Außerdem werden die Verbindungsleitungen innerhalb des Gehäuses beidseitig von jeweils an ihren Enden kettenartig verschwenkbar miteinander verbundenen und jeweils paarweise durch (nicht gezeigte) Verbindungsstege zusammengeschlossenen Laschenelementen 100 geführt.The above-mentioned housing enclosing the flexible connecting lines has supports 50, 52 formed on the upper and lower sides of profile rails, which overlap or overlap the end sections 20, 24 of the connecting lines. In addition, the connecting lines are guided inside the housing on both sides by tab elements 100 which are pivotally connected at their ends to each other in a chain-like manner and are each connected in pairs by connecting webs (not shown).

In Fig. 3 ist der in Achsrichtung des Doppelrohrs 11, 13 gesehene Düsenkopf 17 in einem gegenüber Fig. 1 vergrößerten Maßstab gezeigt. Das Außenrohr 11 des Doppelrohrs mündet auf der in der Darstellung vorderen Seite des Düsenkopfs in einem Verteilerkasten 60, während auf der in der Darstellung rückwärtigen Seite des Verteilerkastens ein das Reinigungsmittel weiteren Düsen zuführender Abschnitt des Außenrohrs angeschlossen ist. Das Außenrohr 11 weist einen Zugang in sein Inneres ermöglichenden abnehmbaren Deckel 62 auf. Der Verteilerkasten 60 ist über die Flanschen 64, 66 in ein Ober- und ein Unterteil unterteilt. Das Unterteil 61 erweitert sich konisch in Richtung auf eine untere Düsenplatte 68. Diese untere Düsenplatte 68 trägt im gezeigten Fall vier Düsen 70, 72, 74, 76. Aus. dem Mantel des Außenrohrs 11 führt im Bereich des abnehmbaren Deckels 62 vor dem Verteilerkasten eine an das Innenrohr 13 angeschlossene Zweigleitung 80 heraus, welche das über das Innenrohr zugeführte Reinigungsmittel zu einer die Düsenplatte 68 ergänzenden weiteren Düsenplatte 82 führt, welche drei Düsen 84, 86 und 88 trägt. Zur gleichmäßigen Aufteilung auf die einzelnen Düsen ist die Düsenplatte 82 in ihrem Inneren mit einem Hohlraum versehen, über welchen die Zweigleitung 80 mit den Düsen in Verbindung steht. In der Zeichnung sind die Düsenköpfe mit nach unten gerichteten Düsen in Zuordnung zu einer unterhalb der Reinigungsvorrichtung angeordneten Speichermasse dargestellt. Alternativ kann auch eine umgekehrte Anordnung verwirklicht werden, bei welcher der innerhalb des Gehäuses des umlaufenden Regenerativ-Wärmetauschers vorgesehene Teil des Doppelrohrs einschließlich der Düsenköpfe anstatt an einem Träger hängend auch auf diesem gleitend und mit nach oben gerichteten Düsenköpfen und daran vorgesehenen Düsen geführt ist, um die Reinigung der Speichermasse von der unteren Stirnseite aus durchzuführen.FIG. 3 shows the nozzle head 17 seen in the axial direction of the double pipe 11, 13 on a larger scale than in FIG. 1. The outer tube 11 of the double tube opens into a distributor box 60 on the front side of the nozzle head in the illustration, while a section of the outer tube which supplies the detergent to further nozzles is connected to the rear side of the distributor box in the illustration. The outer tube 11 has a removable cover 62 which allows access to its interior. The distribution box 60 is divided into an upper and a lower part via the flanges 64, 66. The lower part 61 widens conically in the direction of a lower nozzle plate 68. In the case shown, this lower nozzle plate 68 carries four nozzles 70, 72, 74, 76. Off. The jacket of the outer tube 11 leads in the area of the removable cover 62 in front of the distribution box, a branch line 80 connected to the inner tube 13, which leads the cleaning agent supplied via the inner tube to a further nozzle plate 82 which complements the nozzle plate 68 and which has three nozzles 84, 86 and 88 wears. In order to distribute it evenly between the individual nozzles, the interior of the nozzle plate 82 is provided with a cavity, via which the branch line 80 is connected to the nozzles. In the drawing, the nozzle heads are shown with the nozzles pointing downward in association with a storage mass arranged below the cleaning device. Alternatively, an inverted arrangement can also be realized, in which the part of the double pipe, including the nozzle heads, provided inside the housing of the circulating regenerative heat exchanger, instead of hanging on a carrier, is also slid on it and guided with upwardly directed nozzle heads and nozzles provided thereon perform the cleaning of the storage mass from the lower front.

In Fig. 4 ist die erfindungsgemäße Reinigungsvorrichtung für wärmetauschende Flächen in Verbindung mit einer Bauart des umlaufenden Regenerativ-Wärmetauschers dargestellt, bei der in kinematischer Umkehr der Verhältnisse zu dem in Fig. 1 dargestellten Wärmetauscher die Speichermasse 201 ruht, während vor deren gegenüberliegenden Stirnflächen Luftkanalstutzen 202 eines der wärmetauschenden Medien innerhalb der anderen mit dem Gehäuse verbundenen, ruhenden Kanalstutzen 205 umlaufen. Der außerhalb der Speichermasse 201 in diesem Falle zentral angeordnete, die Reinigungsvorrichtung abstützende Träger 31 ist abweichend von Fig. 1 nicht auf einem die Speichermasse umschließenden Mantel 3, sondern einem innerhalb des Nabenrohrs 204 des die Speichermasse 201 abstützenden Speichermassenträgers umlaufenden, die Drehhauben 202 vor den gegenüberliegenden Stirnflächen der Speichermasse miteinander verbindenen Nabenrohr 206 abgestützt. Der Träger 7 zur Abstützung der das Blas- und Spülmittel zuführenden Rohre 11,'13 einschließlich zugehöriger Düsenköpfe 17, 19 ist über eine periphere Führung 9 auf der Außenwandung der Drehhaube 202 gleitend gelagert. Im übrigen genügt es, zur Vermeidung von Wiederholungen auf die Erläuterung zu den Fig. 1 und 2 zu verweisen, zumal die übereinstimmenden Teile der erfindungsgemäßen Reinigungsvorrichtung in den Fig. 1, 2 und 4 mit den gleichen Bezugszeichen versehen.FIG. 4 shows the cleaning device according to the invention for heat-exchanging surfaces in connection with a type of revolving regenerative heat exchanger in which the storage mass 201 rests in kinematic reversal of the relationships to the heat exchanger shown in FIG. 1, while air duct stubs 202 lie in front of its opposite end faces circulate one of the heat-exchanging media within the other stationary duct connection 205 connected to the housing. In this case, the carrier 31, which is arranged centrally outside the storage mass 201 and supports the cleaning device, is not on a jacket 3 enclosing the storage mass, but rather on a rotating mass inside the hub tube 204 of the storage mass carrier supporting the storage mass 201, the rotating hoods 202 in front of the opposite end faces of the storage mass connecting hub tube 206 supported. The support 7 for supporting the pipes 11, '13 supplying the blowing and rinsing agent, including associated nozzle heads 17, 19, is slidably mounted on the outer wall of the rotary hood 202 via a peripheral guide 9. For the rest, it is sufficient to refer to the explanation of FIGS. 1 and 2 in order to avoid repetitions, especially since the corresponding parts of the cleaning device according to the invention are given the same reference numerals in FIGS. 1, 2 and 4.

Abwandlungen der beschriebenen Konstruktion sind verwirklichbar, welche sich sowohl auf die Anzahl und Anordnung der verwendeten Düsenköpfe als auch auf die Ausgestaltung und räumliche Anordnung des Antriebs des Doppelrohrs sowie die räumliche Lage der flexiblen Verbindungsleitungen beziehen.Modifications of the construction described can be implemented, which relate both to the number and arrangement of the nozzle heads used and to the design and spatial arrangement of the drive of the double pipe and the spatial position of the flexible connecting lines.

Wesentlich ist, daß mit der erfindungsgemäßen Vorrichtung eine Reinigung der Speichermasse sowohl während des Betriebes als auch während Stillstandszeiten erfolgen kann, wobei durch die Wahl unterschiedlicher Reinigungs- oder Spülmedien mit unterschiedlichem Druckniveau eine Anpassung an die speziellen Verschmutzungen erfolgen kann. Die erfindungsgemäße Vorrichtung hat besondere Bedeutung für die betriebliche Reinigung von umlaufenden Regenerativ-Wärmetauschern, die zur Wiederaufheizung der Reingase nach der Rohgaswäsche eingesetzt werden. In diesem Fall wird während des Betriebs mit Niederdruck geblasen und ebenfalls während des Betriebs mit Hochdruckwasser gespült.It is essential that the device according to the invention can be used to clean the storage mass both during operation and during downtimes, with the choice of different cleaning or rinsing media with different pressure levels being able to adapt to the particular soiling. The device according to the invention is of particular importance for the operational cleaning of circulating regenerative heat exchangers which are used for reheating the clean gases after the raw gas scrubbing. In this case, the system is blown with low pressure and also flushed with high pressure water during operation.

Claims (12)

1. An apparatus for cleaning the heat-exchanging surfaces of the storage elements of rotary regenerative heat exchangers having at least one row of nozzles disposed beside one another, oriented substantially at a tangent with respect to the axis of rotation of the heat exchanger and in a radially displaceable manner before an end face of the storage element in the interior of the heat exchanger, the nozzles being disposed on a carrier and directing the cleaning material, delivered to them from an external source of cleaning material via movable connecting means to fixed material lines, in an aimed manner onto the storage element, characterized in that the nozzles (70, 72, 74, 76 ; 84, 86, 88) are provided on at least two spaced-apart nozzle heads (19 ; 17) of a tube (11 ; 13) extending substantially radially over one- half of the end face of the storage element (1) and guided in a sealed manner into the interior of the heat exchanger (1, 3, 5), that the radially inner nozzle head (19) has a lesser number of nozzles than the next subsequent nozzle head (17) in the radially outer direction, that the tube carrying the nozzle heads (19 ; 17) is embodied as a double tube, at least in the vicinity of the sealed entry into the interior of the heat exchanger, having an inner tube (13) and an outer tube (11) substantially coaxially surrounding the inner tube, the double tube being connected to two separate external material lines (49 ; 51), in which cleaning material of the same or different types are delivered at the same or different pressures, and that the tubes of the double tube are each connected to two separately adapted nozzles (70-76 or 84-88).
2. An apparatus according to claim 1, characterized in that the nozzle heads (19 ; 17) each have a distributor box (60) connected to the outer tube (11) and protruding substantially at right angles with respect to the tube axis toward the end face of the storage element, for the cleaning material delivered in the outer tube (11) at lower pressure and/or in a greater amount, the distributor box being closed off toward the storage element by means of a nozzle plate (68) carrying the associated nozzles (70=76).
3. An apparatus according to claim 1 or 2, characterized in that the nozzles (84=88), associated with the cleaning material delivered via the inner tube (13), of the nozzle heads (19 ; 17) are each connected to the inner tube (13) via a branch line (80) guided outside the wall of the outer tube (11) and of the distributor box (60).
4. An apparatus according to claims 2 and 3, characterized in that the nozzle plate (68) of the distributor box (60) is augmented by a further nozzle plate (82), in which a hollow chamber communicating with the branch line (80) is embodied for distributing the cleaning material at the higher pressure and/or in the lesser quantity to the nozzle or nozzles (84=88) disposed toward the storage element on the further nozzle plate (82).
5. An apparatus as defined by one of the claims 1-4, characterized in that the movable connecting means are embodied as flexible connecting lines connected on the one end to the double tube (11 ; 13) carrying the nozzle heads (19 ; 17) and on the other end to connections of the material lines (49 ; 51) that are fixed toward the chamber, the connecting lines being guided and/or retained by supporting means in such a manner that their outer end segments (20, 24) extend substantially parallel and rectilinearly, while the inner middle segment (22) connecting the two end segments is guided over an approximately semicircular arc.
6. An apparatus according to claim 5, characterized in that the support means have a bearing surface (50 ; 52) respectively engaging one of the approximately rectilinearly parallel guided two outer end segments (20, 24) of the flexible connecting lines (20, 22, 24) from below or above.
7. An apparatus according to claim 5 or 6, characterized in that strap elements (100), pivotably connected with one another in the manner of a chain at their ends are provided in parallel planes on both sides next to the flexible connecting lines, of which strap elements (100) located on opposed sides of the connecting lines are each combined in pairs by means of connecting struts, which at least in the vicinity of their radii of curvature engage the flexible connecting lines from below or above.
8. An apparatus as defined by claim 7, characterized in that the connecting struts connecting the strap elements (100) are embodied such that they secure the flexible connecting lines against lateral displacement.
9. An apparatus according to one of the claims 1-8, characterized in that incorporated between the movable connecting means and the outer end of the double tube (11 ; 13) is a box-like collector (39) for the cleaning material or materials, which is guided such that it is displaceable back and forth on a rail (41) in a sliding or rolling manner in the longitudinal direction of the double tube (11 ; 13) and is connected via force transmitting means (chain 35) to a drive motor (33).
10. An apparatus according to one of the claims 1-9, characterized by a carrier (31) projecting outward in a cantilevered manner and supported on the jacket of the heat exchanger housing (3), for retaining the outer end of the tube (11 ; 13), the drive thereof (33, 35, 37) and the movable connecting means.
11. An apparatus according to one of the claims 1-10, characterized in that a radially extending carrier (7) is located in the interior of the regenerative heat exchanger, spaced apart from the end face of the storage element (1), the internal housing segment of the tube (11, 13) carrying the nozzle heads (17, 19) being guided in a rolling or sliding manner and retained on this carrier.
12. An apparatus accord ing to claim 11. characterized in that at least the one end of the carrier (7) is retained in a longitudinally displaceable manner in the housing (3) of the regenerative heat exchanger.
EP85901403A 1984-02-23 1985-02-21 Installation for cleaning heat exchange surfaces of storage masses in circulation regenerative heat exchangers Expired EP0172244B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3406516A DE3406516A1 (en) 1984-02-23 1984-02-23 DEVICE FOR CLEANING THE HEAT-EXCHANGING AREAS OF THE STORAGE MEASURES OF CIRCULATING REGENERATIVE HEAT EXCHANGERS
DE3406516 1984-02-23

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EP0172244A1 EP0172244A1 (en) 1986-02-26
EP0172244B1 true EP0172244B1 (en) 1987-12-23

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ID=6228581

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EP85101754A Expired EP0153685B1 (en) 1984-02-23 1985-02-16 Heat-transfer surfaces cleaning device for the intermediate body of a regenerative heat-exchanger
EP85901403A Expired EP0172244B1 (en) 1984-02-23 1985-02-21 Installation for cleaning heat exchange surfaces of storage masses in circulation regenerative heat exchangers

Family Applications Before (1)

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EP85101754A Expired EP0153685B1 (en) 1984-02-23 1985-02-16 Heat-transfer surfaces cleaning device for the intermediate body of a regenerative heat-exchanger

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US (1) US4649987A (en)
EP (2) EP0153685B1 (en)
JP (1) JPH0731033B2 (en)
AT (1) ATE30771T1 (en)
DE (1) DE3406516A1 (en)
DK (1) DK162411C (en)
ES (1) ES8606630A1 (en)
FI (1) FI78349C (en)
PT (1) PT80000B (en)
WO (1) WO1985003768A1 (en)

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Also Published As

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DK162411B (en) 1991-10-21
FI78349C (en) 1989-07-10
FI850551L (en) 1985-08-24
US4649987A (en) 1987-03-17
DK82085D0 (en) 1985-02-22
ES8606630A1 (en) 1986-04-16
PT80000A (en) 1985-03-01
DK82085A (en) 1985-08-24
DE3406516C2 (en) 1992-03-19
EP0153685A1 (en) 1985-09-04
FI78349B (en) 1989-03-31
FI850551A0 (en) 1985-02-11
DK162411C (en) 1992-03-16
EP0153685B1 (en) 1987-11-11
WO1985003768A1 (en) 1985-08-29
EP0172244A1 (en) 1986-02-26
ES540656A0 (en) 1986-04-16
JPH0731033B2 (en) 1995-04-10
PT80000B (en) 1987-05-29
ATE30771T1 (en) 1987-11-15
DE3406516A1 (en) 1985-08-29
JPS61501280A (en) 1986-06-26

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