EP2054692B1 - Device for cleaning high pressure tanks - Google Patents

Abstract

The invention relates to a device (1) for cleaning a tank (2) using a cleaning fluid (3), having at least one cleaning device (4) comprising means for aligning a fluid distribution device (5) with interior regions of the tank (2), wherein the at least one cleaning device (4) is surrounded by a container (6) and can be mounted on an adapter (8) of the tank (2) by means of at least one connecting piece (7). Particularly preferred application possibilities and operating methods are also explained.

Description

The present invention relates to a device for cleaning a boiler with a cleaning fluid having at least one cleaning device, which comprises means for aligning a fluid distribution device to inner regions of the boiler. In particular, boilers are considered, which are intended to treat a gas at high pressure and high temperature. Such boilers serve, for example, as heat exchangers for coal gasification plants.

By coal gasification is meant a series of processes for coal conversion in which ground coal is reacted with water vapor and oxygen at temperatures of 650 ° C to 2,000 ° C and pressures up to 100 bar. Depending on the process, synthesis gases are produced with different proportions of hydrogen, carbon monoxide and methane. This synthesis gas serves, for example, as a starting substance for the chemical industry, but it is also possible, for example with high proportions of methane, that the synthesis gas is used as natural gas substitute.

Recently, however, there is a desire, in addition to brown coal, hard coal, peat, wood and sewage sludge may burn other substances. For example, there is also a need to gasify, if necessary, heavy oils or similar materials.

After gasification, the synthesis gas or crude gas is cooled in at least one heat exchanger. If necessary, additional fluids (steam, gases, etc.) can be added, but this is not absolutely necessary. However, it should be noted that this synthesis gas or raw gas on entering such a heat exchanger, for example, after a kind of shell and tube heat exchanger, still temperatures well above 1000 ° C, for example of about 1,400 ° C, has. If necessary, pressures in the range of 50 bar or more in the heat exchanger boiler are maintained.

In the conventional coal gasification plants unnoticed contamination of the heat exchange surfaces occurred, so that, for example, an average travel time (operation without interruption) of more than 9 weeks could be realized. In the downtime then the contaminants were either knocked off or removed with a gaseous blowing medium

In view of the changing combustion conditions, however, significantly higher levels of contamination are to be expected, which under certain circumstances also adhere very strongly and thus have a heat exchange-inhibiting properties. To ensure a sufficiently long travel time of such a system, it is therefore desirable to allow a subsequent cleaning during operation of the boiler.

From the WO 2006/021164 A1 For example, a tube heat exchanger is known for use in a textile machine, which can be cleaned by means of a cleaning device of impurities. The cleaning device consists of a pressure hose with a nozzle that can be wound on an adjustable role. The cleaning device is arranged in a housing that is connected to the heat exchanger. The pressure hose can be fed to the heat exchanger via a passage in the housing. This document shows a device according to the preamble of claim 1.

From the WO 91/03328 A In addition, a device for cleaning a chemical reactor is known, With the aid of this device, a cleaning medium is fed to a reactor, wherein the cleaning agent is sucked off again by a vacuum generator arranged in a housing of the device.

On this basis, it is an object of the present invention, at least partially to solve the problems described with reference to the prior art. In particular, devices and methods are to be specified, which ensure an optionally selective, effective cleaning of the heat exchange surfaces during operation even in the above ambient conditions inside such a boiler. In addition, the devices and methods should be as flexible as possible. This is especially true with regard to a heat exchanger that connects directly behind such a coal gasifier ("syngas cooler").

These objects are achieved with a device according to the features of patent claim 1, a system according to the features of patent claim 5 and a method according to the features of patent claim 10. Advantageous embodiments of the invention are specified in the respectively formulated dependent claims. It should be noted that the features listed individually in the claims in any technologically meaningful, Manner can be combined and show other embodiments of the invention. In addition, particularly preferred embodiments of the invention are also given in the description and in the description of the figures.

The device for cleaning a boiler with a cleaning fluid having at least one cleaning device, which comprises means for aligning a fluid distribution to the inner regions of the boiler, has at least one cleaning device, which is surrounded by a container and mountable with at least one fitting to a connecting piece of the boiler.

With regard to the cleaning device, it is preferred that the means for alignment can cause pivoting, moving and / or rotating of the fluid distribution device, possibly also a positioning adjacent to different inner regions of the boiler. For example, the fluid distribution device can be designed as a type of water, steam and / or gas lance, in particular with a nozzle, which can deliver a directed jet of the cleaning fluid. The means for alignment now allow a relative movement to the boiler or to its inner regions, so that optionally different inner regions can be flown with the cleaning fluid.

It is now proposed that the at least one cleaning device is surrounded by a, preferably gas-tight, container. By container is meant in particular a container in the interior of which pressures (well above the atmospheric pressure) can be maintained, which in particular are still above the (possibly even maximum) operating pressure in the interior of the boiler. Such pressure vessel may be made of high-strength steel, for example. The positioned inside the container components, such as the cleaning devices, parts of Fluidverteileinrichtung and the like are now substantially positioned therein, optionally drive, monitoring, sensor components and the like are pressure-tight outwards. The accesses to this container are all made with a high-pressure seal.

This container or pressure vessel has at least one connecting piece, which is (also pressure-tight) can be mounted on a connecting piece of the boiler. Particularly preferably, this connection piece is designed in the manner of a pipe attachment to the container, so that the protruding connection piece can be easily positioned to the connecting piece of the boiler. The connection piece can be stirred with connecting elements in order to be able to be aligned precisely with the position of the connection piece.

Preferred is a variant in which only exactly one cleaning device is provided. In this case, it is also preferable that only one fitting is present. Nevertheless, for example, a plurality of connecting pieces may be provided, for example in order to simultaneously realize a plurality of connections to the boiler or to be able to contact different connection variants or connecting pieces of the boiler with an exact fit. In the latter case, the connecting pieces are provided with an end seal, so that only the currently used connecting piece is opened.

With the jacket of the cleaning device through the pressure vessel is made possible that even during operation of the boiler at high pressures, a connection between the cleaning device and the interior of the boiler is possible, so that the cleaning fluid can be fed into inner areas of the boiler. This has the consequence that no separate downtime of the boiler are required more to allow cleaning of the heating surfaces or other inner wall portions of the boiler.

Particularly preferably, the device is provided as a kit, wherein the container may be provided with different receiving constructions to include, if necessary, several and / or mutually different, cleaning equipment.

The pressure-increasing plant comprises in particular a gas supply device, optionally also a gas discharge device. With the pressure booster system is thus possible in particular, a gas, in particular a so-called purge gas, to be introduced into the container to increase the pressure there. As purge gas, for example, nitrogen is considered, but it is also possible to introduce other gases, such as those that are also present in the boiler, in the pressure vessel. The pressure booster can be connected to the container in particular with a pressure line and optionally with a pressure sensor.

It is also proposed that the fluid distribution device is designed to be movable or pivotable at least through the at least one connecting piece. Particularly preferred is the embodiment, wherein the fluid distribution device can be moved both through the connector and in addition also pivotable or even additionally designed rotatable. In that regard, in particular means are provided which enable a relative movement of at least one subcomponent of the fluid distribution device through the at least one connecting piece. In the event that a plurality of connecting pieces are provided, positioning means are also provided, which initially align the fluid distribution device to the respectively desired connection piece and then at least partially pass it. In particular, parts of the cleaning fluid line, the fluid lance (eg heavy, tube-like component of an extension of at least 1 meter) and / or the nozzle can be moved through the connection piece. Most preferably, a subcomponent of the fluid distribution device can then only be moved through the connection piece when the connection piece substantially implements a vertical connection to the boiler, so that the fluid distribution device can be introduced into the vessel vertically from above, following gravity. A pivoting of the fluid distribution device is preferred when the fluid distribution device through a substantially horizontal connection is introduced via the connector into inner portions of the boiler.

Furthermore, it is considered advantageous that the fluid distribution device comprises a flexible hose which can be arranged on a hose reel, and the hose reel is provided in the container. In this embodiment, the fluid distribution device comprises, for example, a nozzle which can dip vertically in the direction of the boiler and is arranged on a flexible hose (eg metal hose) that withstands the temperatures and pressures. The fluid distribution device is embodied such that it discharges the cleaning fluid approximately horizontally and / or preferably also upwards against the force of gravity, in particular substantially uniformly in a rotationally symmetrical manner, onto the inner regions of the vessel. In order to allow immersion in the boiler over, for example, 20 or 30 m, the hose is placed on a corresponding hose reel, so that it can be unwound differently far depending on the desired cleaning height. This, relatively large, hose reel is now also positioned in the pressure vessel. This has the advantage that the hose guide is within the same pressure level. Sensors for operating the hose reel (path measuring systems, hose end position control, etc.) are preferably positioned outside the container

Moreover, it is also preferred that the device, wherein the fluid distribution device comprises a flexible hose which can be moved by means of a drive through the at least one connecting piece, is equipped with a drive arranged in the container. In order to ensure a precise movement of the hose and thus also of the fluid distribution device, the metal hose is driven frictionally, for example by driven rollers. The rollers are advantageously operable in both directions, so that a wegwegaue fluid distribution is realized. This drive is advantageously arranged in the container, wherein the embodiment described here With the driven rollers readily withstand the conditions prevailing in the operation conditions.

In addition, it should be noted that, for example, the drive for the hose reel and / or displacement sensor for controlling the movement of the hose are positioned outside the container. For this purpose, suitable passages through the container are provided.

A plant according to claim 5 is now particularly proposed, comprising at least one boiler for treating a gas at high pressure and high temperature, in which at least one heat exchange surface is provided in the boiler and at least one device according to the invention and a corresponding connection piece is provided on the outside of the vessel wherein the fluid distribution device is positionable so that it can promote a cleaning fluid to the at least one heat exchange surface.

While essentially a description of the separate, mountable device for cleaning is made above, this is now connected at this point concretely with a corresponding system. This is in particular a heat exchanger boiler, which adjoins the coal gasification plant. This boiler, which is designed for example as a cylindrical pressure vessel with membrane walls and Schottheizflächen (pipe material Inconell 800, AC66) and thereby has a diameter of for example 3 to 5 m and a height of 30 to 50 m, with a gas pressure in the range of 30 to Operated at 50 bar, wherein the inlet temperature of the gas in the boiler in a range of 1,000 ° C to 1,600 ° C is located. With correspondingly large systems, mass flows of the gas of 15 to 25 t / h are realized. These are in particular installations in which non-coal substances are burned, especially heavy oils and the like.

Especially in the above-described systems is preferred that a plurality of devices are mounted on the top of the boiler or mounted, so that then vertically fluid distribution can be introduced into the boiler so that they can reach with their cleaning fluid at least portions of the realized there heat exchange surface. Most preferably, the heat exchange surfaces are formed with a plurality of heat exchanger tubes, which are flowed through, for example, by a cooling medium such as water. These heat exchange surfaces are positioned in particular in the upper third of the boiler. The tubes, the contemplation of the cross section of the boiler can now be arranged with a pattern. Such a pattern comprises, for example, a circular arrangement of the tubes at a certain distance from the boiler housing, of which radially inwardly oriented rows are provided to a central region, so that a plurality of heat exchanger sectors are formed in the circumferential direction, for example 10, 12, 14, 16, 18 or 20 in number. It is now preferred that at least one connecting piece is provided for each of these heat exchanger chambers, so that one (or more) cleaning device or one (or more) fluid distribution device penetrates vertically into the boiler via the connecting piece and descend selectively to the desired heat exchanger sector can. In this way, a very targeted and thorough cleaning is possible.

In addition, it is also proposed that the boiler has a plurality of connecting pieces and at least one device can be aligned with a plurality of connecting pieces. Thus, in particular the case is described that only one device is present, so that the fluid distribution device is aligned together with the container to the respective connecting piece, a pressure-tight connection is generated, and then the cleaning device is activated.

It is particularly advantageous that closure means are provided on the at least one connecting piece. This closure means are used in particular to seal the connection piece with respect to the external environment, so that, for example, gas exchange from the interior of the boiler into the environment or the container is no longer possible. This ensures that the container can be disconnected, especially then the pressure therein can be eliminated. This on the one hand a preservation of the internal component is achieved, moreover, for example, a mounting flap of the container can be opened to perform a maintenance and / or repair of the arranged inside the container components.

According to a development of the system, at least sensors are provided for determining a degree of soiling of the heat exchange surface or the ambient conditions in the boiler. It is preferred that both types of sensors mentioned above are present. With regard to the arrangement of the sensors for determining a degree of contamination of the heat exchange surface, it should be noted that although these sensors may be optical or non-contacting sensors, preference is given to heat flow sensors which are brought into heat-conducting contact with the heat exchange surface at certain horizontal levels. Based on the temperature difference, the heat exchange between the passing gas and the heat exchange medium can be detected in the interior of the heat exchanger tubes, so that the degree of slag can be determined in this way. If in this case a certain limit value is reached or exceeded, a targeted, selective cleaning of the soiled areas of the heat exchange surface is carried out. The provision of sensors for determining the ambient conditions in the boiler is helpful, for example, to determine the pressure inside the container for the next cleaning process or regulate.

According to a development of the system, it is also proposed that a control unit is provided for at least one of the following functions: supply of the cleaning fluid, positioning of the device to the boiler, change of the ambient conditions in the container, detection of operating data of the boiler. For this purpose, the control unit is connected to at least one of the following components: the device, the cleaning fluid supply line, the hose reel, the drive, the connecting piece, a sensor, the pressure increasing device. Thus, the control unit, for example, make the supply of the cleaning fluid or the deactivation of the supply of the cleaning fluid. Also, for example, taking into account the determined slagging of the heat exchange surface, the positioning of the device or the Fluidverteileinrichtung done. On the one hand, this means on the one hand, for example, that the device is aligned with the corresponding connecting piece, but on the other hand, alternatively or alternatively, the position of the fluid distributing device or the nozzle can be made and influenced for the cleaning surface.

1. (a) Anpassen einer Umgebungsbedingung im Behälter an die Umgebungsbedingung im Kessel;
2. (b) Verbinden des Behälters in dem Kessel über das Anschlussstück und den Anschlussstutzen;
3. (c) Ausrichten der Fluidverteileinrichtung zu inneren Bereichen des Kessels;
4. (d) Fördern eines Reinigungsfluids auf die inneren Bereiche des Kessels.

According to a further aspect of the invention, a method according to claim 10 for cleaning an operating plant according to one of claims 5 to 9 with at least one vessel for the treatment of a gas at high pressure and high temperature is proposed, comprising at least the following steps:

1. (a) adjusting an environmental condition in the vessel to the ambient condition in the boiler;
2. (b) connecting the tank in the boiler via the fitting and the spigot;
3. (c) aligning the fluid distribution device with interior regions of the vessel;
4. (d) conveying a cleaning fluid to the inner portions of the vessel.

This method can be realized in particular with the plant described here in accordance with the invention.

The ambient conditions in the container relate in particular to the pressure. So especially when adjusting the pressure in the container to select such a pressure that is above the pressure in the boiler, for example, an overpressure of about 50 kPa. Due to the slight overpressure, the purge gas (for example, nitrogen) flows through the connection piece and the connecting piece into the boiler, so that penetration of the synthesis gas into the pressure container is avoided. At the same time, contamination of the components in the container is counteracted.

In particular, a fluid-technological connection between the container and the boiler is realized by step (b), for example by opening corresponding blocking and / or closing means.

When aligning the Fluidverteileinrichtung according to step (c), in particular the vertical immersion of a hose with a lance or nozzle meant in the boiler, in which case the fluid distribution device is particularly preferably selectively positioned on (only) the polluted sectors and begins there with a cleaning.

Step (d) means in particular the supply of a cleaning medium with a pressure which is sufficient to reach the heat exchange surfaces to be cleaned. In the case of liquids, the pressure has to be chosen in particular such that only wetting (essentially without abrasive action) is realized, whereas with gases the kinetic energy has to be sufficiently high to blow away the contaminants, so that the smallest possible distance between Fluid distribution and heat exchange surface should be realized.

• (e) Identifizieren eines Reinigungszustandes;
• (f) Positionieren der Fluidverteileinrichtung in dem Behälter in einer Rastposition;
• (g) Trennen des Behälters von dem Kessel über das Anschlussstück und den Anschlussstutzen;
• (h) Anpassen der Umgebungsbedingung im Behälter an das äußere Umfeld der Anlage.

Now that in particular the introduction of the method for purification has been explained above and can be completed in any known manner, a particularly preferred embodiment of the process end is shown below. Accordingly, the completion of the cleaning process comprises at least one of the following steps:

• (e) identifying a cleaning condition;
• (f) positioning the fluid distribution device in the container in a latching position;
• (g) separating the container from the kettle via the fitting and the spigot;
• (h) adjusting the environmental condition in the vessel to the external environment of the facility.

By identifying a cleaning state is meant in particular that the current cleaning state is detected or measured. In principle, it is also possible that due to, for example, empirical values, a certain cleaning intensity or cleaning time is used as a fixed (time) limit for completing the cleaning process, but a higher-quality cleaning result can be achieved with the first-mentioned variant.

In order to enable a (temporary) separation and / or a repositioning of the fluid distribution device, it is proposed to return the fluid distribution device to a latching position (or reference position) inside the container, from which the orientation of the device can be regularly started.

The fluidic connection between vessel and vessel is then to be separated in particular so that e.g. powered shut-off and / or closing means are active.

For assembly and / or maintenance activities, the ambient condition in the tank is re-adjusted to the normal atmosphere.

This method is particularly advantageous when the container is provided in step (a) with a pressure of at least 30 bar, in particular for example even 50 bar. The container and the corresponding seals are suitable for this purpose.

As already indicated, it is advantageous, especially in the case of the coal gasification plants described above, for the vessel to be charged with nitrogen gas in step (a). In particular, a slight overpressure (about 30 to 80 kPa) compared to the pressure in the boiler to realize.

Finally, it is also proposed that a liquid is used as the cleaning fluid, with this being used with an overpressure of 1 to 10 bar, preferably 1 Up to 5 bar, based on the pressure in the boiler is initiated. This is just enough, taking into account the flow velocities of the synthesis gas, in order to be able to connect the areas of the boiler that are more than 200 mm away, for example. The impingement or action of the liquid in the slag leads to a sudden evaporation, with the concomitant sudden volume change causing the slag to burst or flake off.

The invention as well as the technical environment are also illustrated in connection with the attached figure. This figure shows a particularly preferred embodiment of the invention to which, however, this is not limited.

The FIG. 1 schematically shows the structure of a coal gasification plant with a device according to the invention for implementing the method according to the invention.

In the lower area, the boiler 2 is illustrated, which is designed here with two connecting pieces 8, which are each designed with closure means 15. In the left connection piece 8, the connection means 15 are designed with a motor (represented by a circle with an M), while the right connection piece 8 has a closure means 15 in the manner of a flap, which can only be opened manually.

Inside the boiler 2, a heat exchange surface 14 is shown in the left area, for example, with a series of heat exchange tubes, which are traversed by water. The vertical direction extending tubes and the heat exchange surface 14 has at different horizontal levels sensors 16 for determining the temperature. On the basis of these sensors 16 conclusions about the degree of slagging or contamination of the heat exchange surface 14 can be obtained. If a high pollution is identified, the cleaning process begins, advantageously only in the sufficient actually heavily cleaned sectors of the heat exchange surface 14 is actually made a selective cleaning.

The cleaning itself is realized here with the device 1 according to the invention. The device 1 comprises a cleaning device 4, which comprises a hose reel 11, a hose 10, a drive 12 and a fluid distribution device 5. These components are also arranged in a container 6, which withstands pressures of, for example, 60 bar. The container 6 is designed substantially kesselelförmig, wherein a pressure-tight sealed side wall can be separated as a mounting flap for mounting the individual components. The container 6 has a connection piece 7, which can be connected to the connecting piece 8 of the boiler 2. This can be done either directly or, as illustrated here, with a (in particular tubular) intermediate piece.

Here it is shown that the fluid distribution device 5 has been passed out of the container 6 through the connection piece 7 and the connecting piece 8, so that the fluid distribution device 5 is positioned to the corresponding sectors of the heat exchange surface 14 to be cleaned. By a corresponding discharge of the cleaning fluid 3, the heat exchange surfaces 14 are wetted and also cleaned by the expansion of the liquid. After completion of the cleaning process, the fluid distribution device 5 is again returned to the interior of the container 6 in a latching position, wherein the tube 10 is rolled up on the hose reel 11 at the same time. Then, the closure means 15 can be controlled by motor, so that the boiler 2 is again tightly closed.

During cleaning, the container 6 is charged with a flushing medium, in particular nitrogen. This is introduced by means of the pressure booster 9 in the interior of the container 6. With the help of a sensor 16 in the connection between the pressure booster 9 towards the container 6, the pressure in the interior of the container 6 can be accurately adjusted or regulated (eg, depending on the pressure in the boiler). If the desired pressure is present, you can turn the closure means 15 are opened. In addition to the flushing agent supply, the cleaning fluid supply can also be monitored with corresponding sensors (for monitoring the pressure, pressure sensors are provided which are marked with a P). For the delivery of fluids or for operating closure means, valves and similar apparatus more servo motors 19 are also provided.

The servomotors, the sensors and the like are also connected to a control unit 17 via various connections 18 in order to realize a data exchange and / or a control and / or a regulation of various components.

This entire system 13 is used in particular for cooling a synthesis gas which flows into the boiler 2 at temperatures above 1,300 ° C. and a pressure above 40 bar. The device 1 shown here allows for the first time the cleaning of heat exchange surfaces in such boilers, which are operated at high pressure and high temperature and that online, ie during operation.

LIST OF REFERENCE NUMBERS

1

contraption

2

boiler

3

cleaning fluid

4

cleaner

5

fluid distribution

6

container

7

connector

8th

spigot

9

Booster station

10

tube

11

hose reel

12

drive

13

investment

14

Heat exchange surface

15

closure means

16

sensor

17

control unit

18

connection

19

servomotor

Claims (14)

1. An apparatus (1) for the cleaning of a boiler (2) by means of a cleaning fluid (3), with at least one cleaning appliance (4) which comprises means for aligning a fluid distribution device (5) with inner regions of the boiler (2), wherein the at least one cleaning appliance (4) is surrounded by a container (6) and wherein the container (6) is mountable onto a connecting port (8) of the boiler (2) by means of at least one connection piece (7), wherein the fluid distribution device (5) is insertable and retractable through the connection piece (7) and the connecting port (8) of the boiler (2), the container (6) being connected to a pressure increasing installation (9), with which the pressure in the container (6) can be varied and with which a flushing gas can be fed into the container (6).
2. The apparatus (1) as claimed in patent claim 1, wherein the fluid distribution device (5) is designed to be movable or pivotable at least through the at least one connection piece (7).
3. The apparatus (1) as claimed in one of the preceding patent claims, wherein the fluid distribution device (5) comprises a flexible hose (10) which can be arranged on a hose trum (11) being provided in the container (6).
4. The apparatus (1) as claimed in one of the preceding patent claims, wherein the fluid distribution device (5) comprises a flexible hose (10) which can be moved through the at least one connection piece (8) by means of a drive (12), and the drive (12) being provided in the container (6).
5. A plant (13) comprising at least one boiler (2) for the treatment of a gas at high pressure and high temperature, in which at least one heat exchange surface (14) is provided in the boiler (2) and at least one apparatus (2) as claimed in one of patent claims 1 to 4 and also a corresponding connecting port (8) are provided on the outside of the boiler (2), wherein the fluid distribution device (5) is positionable such that it conveys a cleaning fluid (3) onto at least one heat exchange surface (14).
6. The plant (13) as claimed in patent claim 5, wherein the boiler (2) has a plurality of connecting ports (8) and at least one apparatus (1) is alignable with a plurality of connecting ports (8).
7. The plant (13) as claimed in patent claim 5 or 6, wherein closing means (15) are provided on the at least one connecting port (8).
8. The plant (13) as claimed in one of patent claims 5 to 7, wherein at least one sensor (16) for determining a degree of contamination of the heat exchange surface (14) or the ambient conditions in the boiler (2) is provided.
9. The plant (13) as claimed in one of patent claims 5 to 8, wherein a control unit (17) is provided for at least one of the following functions: supplying of the cleaning fluid (3), positioning of the apparatus (1) in respect to the boiler (2), variation of the ambient conditions in the container (6), detection of the operating data of the boiler (2).
10. A method for the cleaning of a plant (13) which is in operation, as claimed in one of the patent claims 5 to 9, with at least one boiler (2) for the treatment of a gas at high pressure and high temperature, with at least the following steps:

    a) adapting an ambient condition in the container (6) to the ambient condition in the boiler (2);

    b) connecting the container (6) to the boiler (2) via the connection piece (7) and the connecting port (8);

    c) alignment of the fluid distribution device (5) with inner regions of the boiler (2);

    d) conveyance of a cleaning fluid (3) onto the inner regions of the boiler (2).
11. The method as claimed in patent claim 10, wherein at least one of the following steps comprises the ending of the cleaning operation:

    e) identification of a cleaning condition;

    f) positioning of the fluid distribution device (5) in the container (6) in a latching position;

    g) separation of the container (6) from the boiler (2) via the connection piece (7) and the connecting port (8);

    h) adaption of the ambient condition in the container (6) to the external surroundings of the plant (13).
12. The method as claimed in patent claim 10 or 11, wherein the container (6) is provided in step a) with a pressure of at least 30 bar.
13. The method as claimed in one of patent claims 10 to 12, wherein the container (6) is loaded in step a) with nitrogen gas.
14. The method as claimed in one of patent claims 10 to 12, wherein the cleaning fluid (3) used is a liquid, wherein this is introduced at an overpressure of 1 to 10 bar with respect to the pressure in the boiler (2).

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