EP0195366A2 - Process and device for cleaning fume ducts - Google Patents

Abstract

The invention relates to a washing process for cleaning fume ducts with liquid cleaning agents and devices for implementing this process.

Description

The invention relates to washing processes for cleaning flue gas pipes with liquid cleaning agents and devices for performing this method.

The main cause of incomplete heat transfer in boilers is deposits of flue gas residues or lime on the combustion or water side. On the furnace side, these deposits consist of soot or mineral slags, which have to be removed at certain time intervals. Chemical or chemical-physical cleaning agents have proven to be particularly suitable, as they are usually sprayed as an aqueous solution on the surface to be cleaned (wetting process) and penetrate the deposits, which can then be mechanically (washed or scraped off) or thermally (blasted off when Heating) from the firing-side wall.

• - Die Rauchgasrohre in Großkesselanlagen, wie etwa beim Dreizug-Hochleistungskessel; verlaufen als Rohrbündel horizontal vom Feuerraum zur Rauchkammer in einer Länge bis zu mehreren Metern.
  Zur Reinigung mittels Netzverfahren, müßte die Reinigungslösung über diese gesamte Länge gleichmäßig versprüht werden, ohne daß größere Mengen der Lösung auslaufen, da sonst die Kesselisolierung beschädigt würde.
• - Aufgrund der langen Betriebsintervalle von Großkesselanlagen (ununterbrochener Betrieb während der Heizperiode, Wartung und Reinigung nur in den Sommermonaten) und des hohen Brennstoffdurchsatzes sind die feuerungsseitigen Ablagerungen so stark, daß sie erst bei mehrmaligem Wiederholen des Netzverfahrens vollständig entfernt würden. Dabei müßte der Kessel zwischen jeder Reinigung erneut angefahren und abgekühlt werden.
• - Bedingt durch die Betriebsweise von Großkesselanlagen, schlagen sich feuerungsseitig fast ausschließlich mineralische Beläge- sog. Sulfatbeläge - nieder. Diese haften besonders fest an und können mechanisch nur durch Ausbohren der Rohre entfernt werden, wobei immer die Gefahr einer Beschädigung des Rauchgasrohres durch Metallabtrag gegeben ist. Demgegenüber könnten Sulfatbeläge durch chemisch, bzw. chemisch-physikalisch wirkende Reinigungslösungen vollständig beseitigt werden, ohne das Rauchgasrohr - wie bei den mechanischen Reinigungsverfahren - zu beschädigen.

Such network methods are widely used for cleaning smaller heating systems, but cannot be used in large heating systems due to the dimensions of the flue gas pipes and the construction and operation of large boiler systems:

• - The flue gas pipes in large boiler systems, such as the three-pass high-performance boiler; run as a tube bundle horizontally from the combustion chamber to the smoke chamber with a length of up to several meters.
  For cleaning by means of a wetting process, the cleaning solution would have to be sprayed uniformly over this entire length without large amounts of the solution leaking out, since otherwise the boiler insulation would be damaged.
• - Due to the long operating intervals of large boiler systems (uninterrupted operation during the heating period, maintenance and cleaning only in the summer months) and the high fuel throughput, the deposits on the furnace side are so thick that they would only be completely removed if the network procedure was repeated several times. The boiler would have to be restarted between each cleaning and cooled down.
• - Due to the operation of large boiler systems, mineral deposits - so-called sulfate deposits - are almost exclusively deposited on the combustion side. These adhere particularly firmly and can only be removed mechanically by drilling out the pipes, whereby there is always the risk of damage to the flue gas pipe due to metal removal. In contrast, sulfate deposits could be completely removed by chemical or chemical-physical cleaning solutions without damaging the flue gas pipe - as in the mechanical cleaning processes.

• - Wie zuvor beschrieben, muß verhindert werden, daß größere Mengen der Reinigungslösung zur Feuerungsseite oder zur Rauchkammer hinauslaufen. Die aus dem Bekannten vorgeschlagene Maßnahme: Absaugen der Reinigungslösung an der Feuerungsseite kann nicht sicherstellen, daß am rauchkammerseitigen Ende Reinigungslösung ausfließt. In der Praxis führt dies dazu, daß die Sprühlanze nicht bis in dem Bereich der rauchkammerseitigen öffnung geführt werden darf, was zu einem unvollständigen Reinigungsergebnis führt.
• - Das aus der DE-OS-28 45 938 Bekannte ist ein Sprühverfahren, bei dem nur die jeweils im Bereich des Sprühkopfes befindlichen Teile der Rohrwandung benetzt werden. Da unter Praxisbedingungen an noch warmen öfen (Vassertemperaturen und damit auch Rohrtemperaturen - bis zu 80°C sind üblich) gearbeitet wird, trocknet das Reinigungsmittel - zumindest in den oberen Bereichen des Rohrdurchmessers - an und vermehrt durch Verdunstung der Waschflüssigkeit die feuerungsseitigen Beläge im Rauchgasrohr, statt sie zu entfernen.
• - Die zur Einleitung der Reinigungslösung dienende Sprühlanze muß als starres Rohr ausgebildet und mindestens so lang wie das zu reinigende Rauchgasrohr sein. Dies hat Dichtigkeitsprobleme an der feuerungsseitigen Absaugvorrichtung zur Folge, weil in dieser Vorrichtung das Rohr vertikal ohne Verwindungen verschiebbar sein muß.

From DE-OS 26 45 938 a method and a device for cleaning flue gas pipes by chemically active agents is known. It is proposed to spray the cleaning solution into the flue gas pipe by means of a spray lance, a device being attached to the firing-side opening of the flue gas pipe, in which the sprayed cleaning solution escaping from the flue gas pipe is sucked off by a pump with a high delivery rate. This known from the prior art has several disadvantages:

• - As described above, it must be prevented that large amounts of the cleaning solution run out to the combustion side or to the smoke chamber. The measure proposed from the known: suctioning off the cleaning solution on the combustion side cannot ensure that cleaning solution flows out at the end of the smoke chamber. In practice, this means that the spray lance must not be led up to the area of the smoke chamber opening, which leads to an incomplete cleaning result.
• - What is known from DE-OS-28 45 938 is a spray process in which only the parts of the pipe wall located in the area of the spray head are wetted. Since work is still carried out on warm ovens under practical conditions (water temperatures and thus pipe temperatures - up to 80 ° C are common), the cleaning agent dries - at least in the upper areas of the pipe diameter - and increases the deposits on the combustion side in the flue gas pipe due to evaporation of the washing liquid, instead of removing them.
• - The spray lance used to introduce the cleaning solution must be a rigid tube and at least as long as the flue gas tube to be cleaned. This results in tightness problems on the combustion-side suction device, because in this device the pipe must be displaceable vertically without twisting.

The invention is therefore based on the object, while developing what is known from the prior art, to propose a method and a device for cleaning flue gas pipes, which makes it possible to use cleaning solutions known per se even in large boiler systems.

• a) daß das feuerungseitige und das rauchkammerseitige Ende des Rauchgasrohres (2, 3) mittels auswechselbarer Verschlüsse abgedichtet sind
  und
• b₁) der feuerungsseitige Verschluß (4) einen Einlaß und einen Außlaß für die Reinigungslösung (10) aufweist
  oder
• b₂) der feuerungsseitige Verschluß einen Einlaß und der rauchkammerseitige Verschluß einen Auslaß aufweist, wobei gewünschtenfalls ein weiteres Rauchgasrohr an seinem rauchkammerseitigen und seinem feuerungsseitigen Ende mit auswechselbaren Verschlüssen abgedichtet ist und am rauchkammerseitigen Verschluß einen Auslaß für die Reinigungslösung (10) aufweist
  und
• c) daß gewünschtenfalls die die Reinigungslösung (10), fördernde Pumpe (7) an die Einlaß- und Auslaßöffnungen so angeschlossen wird, daß sie die Reinigungslösung (10) im Kreis führt, wobei gewünschtenfalls
• d) ein als Puffer dienendes Ausgleichsgefäß (18), welches ebenfalls Reinigungslösung (10) enthält in diesen Kreislauf eingeschaltet ist
  und
• e) daß die Reinigungslösung (10) das Rauchgasrohr unter Verdrängung der gesamten darin enthaltenten Luft durchflutet.

According to the invention, the object is achieved by a method for cleaning flue gas pipes of large boiler systems - in particular three-pass boilers - by means of a cleaning solution (10) and a pump (7) which delivers the cleaning solution, characterized in that

• a) that the combustion-side and the smoke chamber end of the flue gas pipe (2, 3) are sealed by means of interchangeable closures
  and
• b ₁ ) the firing closure (4) has an inlet and an outlet for the cleaning solution (10)
  or
• b ₂ ) the combustion-side closure has an inlet and the smoke-chamber-side closure has an outlet, if desired a further flue gas pipe being sealed at its smoke-chamber-side and its fire-side end with interchangeable closures and having an outlet for the cleaning solution (10) on the smoke-chamber-side closure
  and
• c) that, if desired, the pump (7) conveying the cleaning solution (10) is connected to the inlet and outlet openings in such a way that it circulates the cleaning solution (10), if desired
• d) a compensating vessel (18) serving as a buffer, which also contains cleaning solution (10), is switched on in this circuit
  and
• e) that the cleaning solution (10) floods the flue gas pipe, displacing all the air contained therein.

The individual steps of the method according to the invention are explained below, reference being made to a closure device (expansion closure) which is particularly suitable for carrying out the method. However, the method can also be carried out using other closures adapted to the flue gas pipes and is not limited to the expansion closure dealt with as an example.

• Figur la - 1c: Schemazeichnungen des erfindungsgemäßen Verfahrens
• Figur 2a, 2b: Von außen verschraubbare Expansionsverschlüsse
• Figur 3a, 3b: Von innen verschraubbarer Expanionsverschluß und Schubstange zur Montage
• Figur 4a, 4b: Von innen verschraubbarer Expansionsverschluß und Schubstange zur Montage
• Figur 5a, 5b: Elastischer Hohlkörper zur Verwendung in Expansionsverschlüssen

Show it:

• Figure la - 1c: schematic drawings of the inventive method
• Figure 2a, 2b: Expansion closures screwable from the outside
• Figure 3a, 3b: Expansion lock screwable from the inside and push rod for assembly
• Figure 4a, 4b: Expansion lock screwable from the inside and push rod for assembly
• Figure 5a, 5b: Elastic hollow body for use in expansion closures

To describe the method according to the invention, reference is first made to FIG.

The flue gas pipe (1) to be cleaned is closed liquid-tight at its combustion-side and its smoke-chamber end (2) (3).

One of the two interchangeable closures, preferably the more accessible firing closure (4), has a filling and an outlet opening (5) (6) which are connected by hoses to the pump (7) or to the expansion tank (8) containing the cleaning agent.

The filling opening (5) is equipped with a pipe section (9), which extends into the flue gas pipe (1) _- hereinafter referred to as the inner pipe (9).

The inner tube (9) can extend as far as the end of the flue gas tube (3) opposite the outlet opening (6); this is to ensure that the largest possible part of the cleaning agent entering through the filling opening flows through the entire length of the flue gas tube. The cleaning agent (10) removed from the expansion tank (8) or another storage container by the pump (7) flows through the filling opening (5) or the inner tube (9) into the flue gas tube (1) which is closed on both sides, displacing the air contained therein and flushes through the entire interior of the flue gas pipe (1).

The outlet opening (6) is as far as possible assigned to the upper part of the closure (4) in order to ensure that the space to be cleaned is completely filled. The cleaning agent (10) flowing out through the outlet opening (6) can be discarded or, as shown in Fig. La, returned to the expansion tank (8), so that the cleaning agent (10) flows as a result in a closed circuit.

Methods that run the cleaning agent in a closed circuit are preferred. Basic detergents are preferably used to remove the sulfate deposits that are particularly common in flue gas pipes. With a single throughput, the entire cleaning capacity of the cleaning agent is not used up. It is therefore much more economical to recycle the detergent until a decreasing pH in the solution indicates that the cleaning power is declining. It is also possible to close two or more flue gas pipes one behind the other and to pass the cleaning agent through the pipes (11) (12) in the "countercurrent principle" (FIG. 1b) or the cleaning agent (10), as shown in FIG. 1c , fed in at one end of the flue gas pipe and removed at the other end.

It is obvious that in the variants shown in FIGS. 1b and 1c, the flue gas pipe closures are each assigned only one filling or outlet opening (5) (6), the position of the outlet opening (6) defining the filling height of the pipe and therefore should be chosen so that the tube is filled as completely as possible.

Smaller dead spaces do not adversely affect the cleaning process, since the delivery rate of the pump can be selected so that the cleaning agent flows turbulently through the pipe.

• Die bereits angelösten Beläge werden von der Strömung abgeschwemmt und ausgetragen. Im Falle einer Kreislaufführung des Reinigungsmittels (10) setzten sich diese Feststoffteilchen 1m Ausgleichsgefäß (8) ab.

The highest possible delivery capacity of the pump also serves as mechanical support for the cleaning agent (10):

• The already dissolved deposits are washed away by the current and carried away. If the cleaning agent (10) is circulated, these solid particles settle in the expansion tank (8).

The flushed out solid particles are settled by simple measures, such as an overflow (15) connected between the intake port (13) and the return (14).

To end the purging, the detergent still in the flue gas pipe is drained through the filling opening (5), whereby, if desired, a pump (7) that can be switched from pumps to suction or a rotation of the firing closure by 180 ° C accelerates the emptying. The closures attached to the pipe ends are removed and can be attached to other flue gas pipes that are still to be cleaned.

Furthermore, the invention relates to devices for carrying out the cleaning process. According to the invention, expansion closures are proposed which can be easily adapted to the pipe diameter used by the manufacturer.

• Eine längs einer Achse (16) verschiebbare Spannscheibe (17) drückt auf einen von ihr und einem Gegenlager (18) an den beiden Stirnseiten eingepaßten flexiblen Hohlzylinder (19), wobei sich dieser Zylinder (19) bei zunehmendem Druck der Spannscheibe (17) nach außen wölbt. Der Zylinder (19) wird vorzugsweise aus Gummi gefertigt. Wird ein so ausgebildeter zylindrischer Verschluß in eine kreisförmige Röhre mit geringfügig größerem Durchmesser eingesetzt, kann durch Auswölben des flexiblen Hohlzylinders (19) das Rohr abgedichtet werden. In der Regel wird die Spannplatte (17) durch eine vorgesetzte Schraube (20) in Richtung auf das Gegenlager (18) verschoben.

The mode of operation of expansion locks is generally known, the principle will be explained using the one shown in FIG. 2:

• A tensioning disk (17) displaceable along an axis (16) presses on a flexible hollow cylinder (19) fitted by it and a counter bearing (18) on the two end faces, this cylinder (19) following itself with increasing pressure of the tensioning disk (17) bulges outside. The cylinder (19) is preferably made of rubber. If a cylindrical closure designed in this way is inserted into a circular tube with a slightly larger diameter, the tube can be sealed by bulging the flexible hollow cylinder (19). As a rule, the clamping plate (17) is shifted in the direction of the counter bearing (18) by means of a screw (20).

It is now proposed to seal the flue gas pipe on both sides by means of expansion closures and, if desired, to provide these closures with corresponding inlet and outlet openings (5), (6) for the liquid cleaning agent (10).

To describe the device, reference is made to FIGS. 2 to 5 without restricting the invention to the specific embodiments shown here. Figure 2a shows an expansion lock with inlet and outlet opening (5, 6); Figures 2b and 3a relate to closures without a passage opening. The inlet and outlet openings (5, 6) are guided as a horizontal bore through the axis (16) of the expansion lock.

The lower hole serves as an inlet opening (5) and the upper one as an outlet opening (6). The inner tube (9) of the inlet opening is longer and thus extends deeper into the flue gas tube than the inner tube of the outlet opening (6), which is preferably designed as a short connecting piece (21). Particularly favorable flow conditions are formed when the inner tube (9) extends almost over the entire length of the flue gas tube, as shown schematically in FIG. A flexible hose can be used as the inner pipe (9), which is adapted to the length of the flue gas pipe and is connected to the inlet opening (5) by means of conventional plug-in or other connecting means. A particular advantage when using a flexible inner tube (9) is that (in contrast to what is known from the prior art) there is no great space requirement (as in the case of rigid tubes) for inserting the tube from the filling side. It is therefore possible to ensure filling even in openings that are difficult to access.

The expansion lock with inlet and outlet shown in Figure 2a is preferably inserted into the flue gas pipe from the firing side and clamped to the tight fit by means of the screw (20).

The expansion seal without a passage opening (FIG. 2b) is placed on the opposite opening of the flue gas pipe - preferably on the smoke chamber side - and clamped by means of the screw (20). The outwardly projecting connecting pieces (22) and (23) for inlet and outlet are, as already described in the method, connected to the pump (7) and, if desired, to the expansion tank (8); the cleaning agent (10) is introduced and rinsed through until the coverings have been completely removed.

The cleaning agent (10) still in the flue gas pipe is drained through the inlet opening (5) or by rotating the expansion closure through 180 ° C through the outlet opening; the expansion locks on the firing end and on the smoke chamber end are released by releasing the screws (20) and removed from the pipe.

The cleaning process can then be continued on the next flue gas pipe.

By using expansion locks with only one opening, several pipes can be connected in series and cleaned at the same time.

The closure device required for this results from the expansion closure shown in FIG. 2a by omitting the feed opening (elements 22, 5 and 9). The inner tube (21) is only designed as a short nozzle. The procedure for cleaning pipes connected in series is described under the term "countercurrent principle" in the cleaning process. Here reference is made to the schematic drawing lb.

The method of feeding and withdrawing from opposite sides, which is explained on the basis of the schematic drawing lc, can also be easily implemented by expansion locks with only one feed or discharge.

The expansion closures dealt with in FIG. 2 have in common that they have to be screwed on from the outside. This is not a problem from the combustion side (2) because maintenance is carried out from this side in all large boiler systems. Depending on the type of boiler, the smoke chamber opening (3) of the flue gas pipes is sometimes so difficult to access that it is difficult or even impossible to attach closures from the outside. Expansion closures for sealing the smoke chamber opening of flue gas pipes are therefore also proposed, which can be inserted and released from the combustion side (2). Reference is first made to FIG. 3.

It has at its front end a hollow cylinder (24) which can be screwed along the axis (16) and is designed to receive a head (26) mounted on a push rod (25). On the wall of the hollow cylinder (24) there are openings (27) which are intended for releasably receiving an axis (28) extending vertically through the head (26).

The thrust bearing (29) contains rotary locks (30) which are pressed outwards by springs (31) and are designed in such a way that they block rotary movements in the direction of closure.

For the introduction into the flue gas pipe, the expansion lock is placed on the head (26) of the push rod (25) and inserted into the flue gas pipe by pressing the turnstiles (30).

The closure can now be pushed up to the smoke chamber opening of the flue gas pipe, with markings on the push rod indicating the required insertion depth. To improve the guidance of the push rod (25) lateral guide wings (32) are attached at certain intervals.

After the expansion lock is pushed as far as the smoke chamber opening of the flue gas pipe, the push rod (25) is turned in the locking direction by means of the handle (33), whereby the two turn locks (30), pressed against the pipe wall by the springs (31), prevent the expansion lock from rotating lock. The hollow cylinder (24) screws along the axis (16) in the direction of the counter bearing (29) and causes the tensioning disc (17) to press on the flexible hollow cylinder (19) and press it against the pipe wall until it closes tightly.

After removing the push rod, the fire-side opening of the flue gas pipe can be closed and the cleaning can be carried out as described above.

After cleaning is complete, the expansion lock on the smoke chamber side is released with the push rod (25) and pulled out of the flue gas pipe towards the combustion side.

In a further embodiment, with reference to FIGS. 4a and 4b, an expansion lock (34) (FIG. 4a) to be assigned to the smoke chamber-side opening (3) is proposed, which has a push rod (35) that can be disassembled into two or more parts along its axis, if desired ( Figure 4b) can be inserted and released from the firing opening (2) of the flue gas pipe.

The expansion lock consists of a threaded rod (36), a clamping ring (37) and an axially movable spacer ring (38). The flexible hollow cylinder (24) made of flexible material is fitted between these two elements (37) and (38). A clamping sleeve (39) is rotatably screwed onto the threaded rod (36). The threaded rod (36) contains an element (41) prepared for receiving the central push rod (40) - for example a hexagon (41). The clamping sleeve (39) contains recesses (42) for receiving the guide lugs (43) of the outer push rod (44).

The two-part push rod (35) consists of the outer push rod (44) and the inner push rod (40) which can be freely rotated therein. On the upper part, outer and inner push rods each have handles (45) (46) or other elements for holding or carrying out radial rotary movements.

At the lower end of the push rod (35), the recesses (47) or guide lugs (43), which are concordant to the elements (41) and (42), are provided. The expansion chamber (34) on the smoke chamber side is thus fitted onto the two-part push rod (35) prepared for receiving the closure by means of the elements (43) and (47) and from the firing end (2) of the flue gas pipe to the smoke chamber end (3) of the pipe pushed, if desired a spacer (48) attached to the push rod (35) limits the maximum insertion depth. As soon as the smoke chamber-side lock (34) is in the desired position, the inner push rod (40) is locked by the handle (46) and by turning the outer push rod (44) by means of the handle (45) the expansion lock (34) to the fixed Screwed seat. The guide lugs (43) can then be pulled out of the element (42) of the clamping sleeve (39) by slightly turning back the outer push rod and the entire push rod (35) can be removed from the firing opening (2) of the flue gas pipe.

After closing the firing-side opening (2) with the expansion closure (4) containing the inlet and outlet, the cleaning can be carried out in the manner described above. After cleaning has ended, the expansion lock (34) on the smoke chamber side is released in its seat by means of the push rod (35) and removed through the opening on the combustion side of the smoke gas pipe.

The push rods according to the invention can have guide rings (49) or guide wings (32) on their circumference, which serve a tube for better guidance of the rod. Furthermore, the push rods (25) or (35) can be broken down into sections of a certain length. This has the advantage that when the smoke chamber-side closure is introduced, a free distance corresponding to the length of the flue gas pipe is not required for attaching the push rod, but that the push rod can be extended by viewing sections in each case until the smoke chamber-side closure on the intended one Spot sits.

The disassembly and assembly of these sections of the push rod is not a problem for the person skilled in the art and can in principle be solved by means of the same elements which also serve to releasably accommodate the expansion closures on the smoke chamber side.

The invention further relates to an improvement of the flexible hollow cylinder (19), (24), which serves as a sealing element in expansion closures.

It has been shown that expansion closures can be fitted particularly tightly when the inner circumferential surface of the cylindrical hollow body (19), (24) has one or preferably a plurality of radially circumferential recesses (50).

This ensures - as shown in FIG. (5a, 5b) - that the expansion seal, which is tightly clamped with the opening, lies sealingly on as large an area as possible.

• Bei der am häufigsten verwendeten Heizkesselart mit horizontal verlaufenden Rauchgasrohren dem Dreizugskessel - wird das erhitzte Rauchgas durch eine den Brennraum abschließende Vendekammer nach vorn - d.h. zur Feuerungsöffnung - und dann durch eine zweite Vendekammer nach hinten - d.h. zum Kamin - geführt.

To define the terms used in the application text "combustion side" and "smoke chamber side", the following must be carried out:

• In the most frequently used type of boiler with horizontal flue gas pipes, the three-pass boiler - the heated flue gas is led to the front through a vending chamber that closes the combustion chamber - ie to the furnace opening - and then to the rear through a second vending chamber - ie to the chimney.

The term “opening on the combustion side” means the opening of the flue gas pipe which is assigned to the side of the burner. Accordingly, the “smoke chamber opening” means the opening of the flue gas pipe assigned to the chimney.

• 1) Flue gas pipe
• 2) Fire-side end of the flue gas pipe
• 3) Smoke chamber end of the flue gas pipe
• 4) Closure on the firing side 2 openings
• 5) Filling opening, inlet opening
• 6) outlet opening
• 7) pump
• 8) Expansion tank
• 9) Inner tube for inlet
• 10) detergent
• 11) Flue gas pipe
• 12) Flue gas pipes
• 13) Intake manifold
• 14) Rewind
• 15) overflow
• 16) axis
• 17) Spring washer
• 18) counter bearing
• 19) flexible hollow cylinder, rubber
• 20) screw
• 21) short nozzle of the outlet opening
• 22) Connection for inlet
• 23) Connection for outlet
• 24) Hollow cylinder
• 25) push rod
• 26) head
• 27) opening
• 28) axis
• 29) counter bearing
• 30) Turnstiles
• 31) feathers
• 32) Guide wing
• 33) Handle
• 34) Smoke chamber expansion lock
• 35) two-piece push rod
• 36) Threaded rod
• 37) tension ring
• 38) Spacer ring
• 39) adapter sleeve
• 40) central push rod, inner push rod
• 41) Element (hexagon) for receiving the central push rod (40)
• 42) Recesses in the clamping sleeve (39) for receiving the guide lugs (43)
• 43) Lead noses
• 44) outer push rod
• 45) Handle outer push rod
• 46) Handle inner push rod
• 47) Recess to match the element (41)
• 48) Spacer
• 49) Guide rings
• 50) Cutouts in the hollow cylinder of the expansion lock

Claims (9)

1) Method for cleaning flue gas pipes of large boiler systems - in particular three-pass boilers - by means of a cleaning solution (10) and a pump (7) delivering the cleaning solution, a) that the combustion side and the smoke chamber end of the flue gas pipe (2, 3) are sealed by means of interchangeable closures
and b ₁ ) the firing closure (4) has an inlet and an outlet for the cleaning solution (10)
or b ₂ ) the combustion-side closure has an inlet and the smoke-chamber-side closure has an outlet, if desired a further flue gas pipe being sealed at its smoke-chamber-side and its fire-side end with interchangeable closures and an inlet on the smoke-chamber-side closure and an outlet for the cleaning solution on the fire-side closure ) having
and c) that, if desired, the cleaning solution (10) pump (7) is connected to the inlet and outlet opening so that it leads the Reipigugslösung (10) in a circle
if desired d) a compensating vessel (8) serving as a buffer and also containing cleaning solution (10) is switched into this circuit
and e) that the cleaning solution (10) floods the flue gas pipe, displacing all the air contained therein, 2) Device for cleaning flue gas pipes using a liquid cleaning agent (10) a) two expansion closures sealing the firing-side opening and the smoke-chamber-side opening,
in which b ₁ ) the one expansion closure has an inlet and the other expansion closure has an outlet for the cleaning agent (10)
or b ₂ ) an expansion lock alone has an inlet and an outlet for the cleaning agent (10)
such as c) a pump (7) conveying the cleaning agent (10)
and d) if desired, a compensation vessel (8) which serves to receive the cleaning agent (10) flowing out of the outlet and to provide the cleaning agent (10) flowing in through the inlet. 3) Device according to claim 2,
characterized in that the inlet opening (5) is arranged below the outlet opening (6). 4) Device according to claim 2, 3
characterized in that the inlet opening (5) is extended by an inner pipe (9) extending into the flue gas pipe, this inner pipe (9) if desired reaching to the side of the flue gas pipe opposite the outlet opening (6). 5) Device according to claim 2 to 4,
characterized in that the firing-side and the smoke chamber-side expansion lock can be screwed from the outside of the combustion chamber or of the smoke chamber. 6) Device according to claim 2b ₂ ,
thereby marked. that the expansion lock carrying the inlet and the outlet is assigned to the opening of the flue gas pipe on the firebox side, and that the expansion lock on the rauckammer side and the firebox cable can be screwed from the firebox. 7) Smoke chamber-side expansion closure according to claim 2 and 6,
characterized in that it has recesses on the side extending into the flue gas pipe. which are prepared for the releasable reception of a horizontally and radially movable push rod extending into the flue gas pipe from the combustion side. 8) Flexible hollow cylinder for expansion locks,
characterized in that, in order to improve the contact surface in the tensioned state, the inner surface has one or more radially encircling deposits. 9) Device according to one or more of claims 2 to 7 containing hollow cylinder according to claim 8.

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