KR20210103534A - Systems and methods for cleaning heat exchanger tubes - Google Patents

Abstract

The present invention relates to a cleaning system (1) for cleaning, under the use of a cleaning medium, ribbed heat exchanger tubes (3) arranged in a row inside a boiler (2), of a heat recovery steam generator (4) of a combined cycle power plant (5) This cleaning system comprises, in particular, a pump device (8) arranged outside the boiler (2) and configured to discharge the cleaning medium from one or more cleaning medium containers (11); One or more cleaning devices 9 arranged inside the boiler 2 , electrically movable in vertical and horizontal directions, and connected to the pump device 11 via a discharge line 10 , for discharging cleaning medium )Wow; a control device 29 arranged outside the boiler 2 and configured to control the movement of the cleaning device 9 . The invention also relates to a cleaning method under the use of such a cleaning system (1).

Description

Systems and methods for cleaning heat exchanger tubes

The present invention relates to a cleaning system and a corresponding cleaning method for cleaning, with the use of a cleaning medium, ribbed heat exchanger tubes arranged in a row inside a boiler of a heat recovery steam generator of a combined power plant.

In combined cycle power plants, gas turbines obtain usable energy through combustion of a fuel-air mixture. Downstream of the gas turbine is arranged a heat recovery steam generator which uses the thermal energy of the waste gas from the gas turbine for steam generation. The steam produced then drives a steam turbine that acquires additional energy that can be used. The heat recovery steam generator may be subdivided into a plurality of zones. As such, the heat recovery steam generator may include a low pressure region, a medium pressure region and a high pressure region. Each zone may include an evaporator or heat exchanger in which the water is evaporated. The steam leaving the evaporator can still be conducted inside the heat recovery steam generator through additional superheaters, in which the temperature and quality of the steam are improved. In addition, some heat recovery steam generators include their own burners to further heat the waste gas from the gas turbine, if necessary.

Due to the high sulfur content of the fuel used in gas turbines, during operation of combined cycle power plants, sulfur deposits occur in the heat exchanger tubes of heat recovery steam generators through which the waste gas flows. These types of sulfur deposits reduce the efficiency of heat recovery steam generators. To counteract this, the heat exchanger tubes are cleaned from the outside at regular time intervals. For the cleaning of the heat exchanger tubes, in the first step the temperature inside the boiler must be reduced enough to allow the cleaning workers to enter the boiler. Since the heat exchanger tubes are usually raised to a height of several tens of meters, scaffolds are formed inside the boiler in a further step parallel to the heat exchanger tubes of the first heat exchanger tube row, the height of these scaffolds being chosen to correspond to the length of the heat exchanger tubes. do. The heat exchanger tubes affected by the sulfur deposits are then cleaned under the use of a cleaning system. Such a cleaning system may be, for example, a commercially available CO ₂ dry ice blasting system that allows the heat exchanger tubes to be manually blasted by a cleaning worker. A disadvantage of this approach is that cleaning personnel are exposed to health-threatening conditions while cleaning operations are carried out inside the boiler, which should in principle be avoided. Also, with the heat exchanger tubes generally arranged closely adjacent, only the first two or three heat exchanger tube rows can be effectively cleaned, which is the _{handheld of a conventional CO 2} dry ice blasting system in the rows lying behind it. This is because sufficient accessibility for the blaster is not provided. A decrease in the efficiency of the heat recovery steam generator, which can be attributed to sulfur deposits on the more rearward heat exchanger tube rows, cannot be counteracted correspondingly. Another disadvantage is that the formation and dismantling of scaffolding inside the boiler is very time and labor intensive, which leads to long downtimes and high costs.

Based on this prior art, the object of the present invention is an alternative cleaning system for cleaning the ribbed heat exchanger tubes arranged in a row inside the boiler, of a heat recovery steam generator of a combined power plant, at least in part, which solves the above-mentioned disadvantages at least in part. and to provide an alternative cleaning method.

To solve this problem, the present invention provides, in particular, a pump device arranged outside the boiler and configured to discharge the cleaning medium from one or more cleaning medium containers; one or more cleaning devices arranged inside the boiler, electrically movable therein in vertical and horizontal directions, and connected to the pump device through a discharge line, for discharging cleaning medium; a control device arranged outside the boiler and configured to control movement of the cleaning device; cleaning for cleaning the ribbed heat exchanger tubes arranged in a row inside the boiler of a heat recovery steam generator of a combined power plant under the use of a cleaning medium provide the system. Due to the electric movement of the cleaning device, there is no need for cleaning personnel to stay inside the boiler during the actual cleaning of the heat exchanger tubes, thereby minimizing the risk to the health of the workers.

Preferably, the pump arrangement is configured to compress the cleaning medium to at least 30 bar. In this way, very good mechanical cleaning performance is achieved.

According to one embodiment of the invention, the cleaning device comprises a high-pressure surface blaster which is preferably immovably held thereon. High-pressure surface blasters are commercially available in a variety of configurations, which has a favorable impact on the cost of the cleaning system. The same applies to non-movable devices, since additional motors and the like are omitted.

Preferably, the cleaning device comprises at least one cleaning lance projecting therefrom and electrically movable back and forth and provided with a fluid channel, in the region of the free end of such cleaning lance one discharging cleaning medium in different directions. The above discharge openings or discharge nozzles, in particular two discharge openings or discharge nozzles, are provided, the discharge directions preferably being arranged at an angle of 90° to each other. An electrically movable back-and-forth cleaning lance of this type, with a fluid channel, which can for example have a diameter in the range of 3 to 8 mm, is advantageous in that it can also be inserted between heat exchanger tubes arranged very densely adjacently. has Correspondingly, the heat recovery steam generator efficiency reduced by sulfur deposits can be fully or almost completely restored, whereby even further rearward heat exchanger tube rows can be accessed and correspondingly cleaned without problems. The provision of a plurality of discharge openings or discharge nozzles that discharge the cleaning medium in different directions is also very helpful in accessing further rearward rows of heat exchanger tubes.

If the cleaning device comprises not only a high-pressure surface blaster but also a cleaning lance of the type described above, the high-pressure surface blaster and the cleaning lance are preferably arranged offset from each other in the vertical direction, so that they cannot interfere with each other when operating simultaneously.

Preferably, one or more discharge nozzles are provided in a nozzle head rotatably arranged on the lance, which nozzle head is rotated, preferably in a known manner, through the cleaning medium itself flowing through the lance. In this way, a rotating jet is created which allows a large area to be cleaned when the lance is at rest.

According to an embodiment of the invention, the cleaning lance is pivotable in a horizontal plane, in particular electrically pivotable. The orientation of the cleaning lances can thus be matched, in particular, to the heat exchanger tubes of different arrangements of the various heat recovery steam generators.

Preferably, one or more sensors connected to the control device are provided, these sensors monitoring the immediate vicinity of the cleaning lance in relation to potential obstacles, the control device being configured to avoid collision with the detected obstacles if an obstacle is detected Preferably, it is configured in such a way as to automatically move or stop the cleaning lance and/or to output a warning signal. Correspondingly, collisions of the lance with obstacles and thus damage to the cleaning device can be reliably prevented. The one or more sensors may be, for example, a spacing sensor or the like.

According to an embodiment of the invention, the cleaning device comprises a camera unit, in particular data technically connected to a control device and/or an analysis device arranged outside the boiler, for illuminating the image area detected by the camera unit. A lighting unit may optionally be provided. This camera unit, on the one hand, can be used to facilitate movement of the cleaning device inside the boiler when movement is carried out through the operator under the use of the control device. However, on the other hand, with the camera unit, evaluation of the condition of the heat exchanger tube before cleaning and/or inspection of the cleaning result after cleaning can also be executed. The corresponding image data can then be stored in the analysis device for documentation. In principle, such an analysis device may be maintained not only in an on-premises manner, but also in a cloud manner.

According to an embodiment of the invention, there is provided a sensor system that detects the actual position of the cleaning device and is data-technically connected to a control device and/or an analysis device arranged outside the boiler. The detection of the actual position of the cleaning device is advantageous in that the actual position can be compared with the target position in order to be able to identify deviations at an early stage. However, the detected actual position may also be assigned, for example, to the image of the camera unit, so that the image can again be unambiguously assigned to a specific position inside the boiler.

The cleaning system preferably comprises two vertically extending support profiles, each arranged at a predetermined distance from each other inside the boiler; one horizontally extending guiding profile, held therein motorically vertically movable, in which the cleaning device is arranged motorically horizontally movably arranged, preferably by movement of the guiding profile and/or Or devices are provided for recognition of each final position of movement of the cleaning device. Implementing the movement of the cleaning device via two vertical support profiles and one horizontal guide profile movably held thereon is in particular characterized by a very simple, inexpensive and robust construction, which also takes a little time Can be assembled by consumption. A device for recognition of each end position can be implemented, for example, via a conventional limit switch.

The guide profile preferably consists of a plurality of partial profiles which together define the length of the guide profile. This subdivision of the guide profile facilitates assembly and disassembly of the guide profile, in particular inside the boiler.

According to an embodiment of the invention, the motorized vertical movement of the guide profile is implemented via one or more cable drives or chain drives positioned outside the boiler, the cables or chains being guided through the boiler opening and fixed to the guide profile. do. In particular, two cable drives or chain drives are used to achieve as uniform a force action as possible on the guide profile. The arrangement of one or more cable drives or chain drives outside the boiler has the advantage in that the one or more cable drives or chain drives can be kept permanently assembled, the operation of the heat recovery steam generator when positioned inside the boiler. It would not be recommended because of the high temperatures formed during

According to a further embodiment of the invention, there is provided one or more inspection devices arranged inside the boiler, therein electrically movable in the vertical and horizontal directions, these inspection devices in particular performing a visual evaluation and/or and to perform and document a dye penetration test and/or to perform an ultrasound test. Such an inspection device can for example be arranged in a guide profile instead of a cleaning device. However, it is alternatively also possible to integrally form the inspection device and the cleaning device. For visual evaluation, the inspection device may be provided with a camera unit. For carrying out and documenting the dye penetration test, the inspection apparatus includes, for example, a rotating steel brush for cleaning the area to be inspected; a spray device for applying the dye; a rotating felt brush for wiping off the applied dye; an additional spray device for application of a second medium; And a camera unit for generating a picture; may be provided. For the implementation of the ultrasound examination, the examination apparatus may be provided with an ultrasound examination head and a spray apparatus for spraying, for example, a bonding medium.

The invention also provides a method for cleaning heat exchanger tubes arranged in a row inside a boiler of a heat recovery steam generator of a combined cycle power plant using the cleaning system according to the invention, in order to solve the problem mentioned in the introduction .

As cleaning medium, in particular water mixed with NHOH, preferably completely demineralized water mixed with NHOH, is used, wherein the content of NHOH is in particular in the range from 20 to 25% by weight and/or the pH value of the cleaning medium is in particular in the range from 10 to 12 am. By means of NH4OH, a chemical cleaning effect is achieved in addition to the mechanical cleaning effect, so that the cleaning result can be definitely improved.

The movement control of the cleaning device via the control device is autonomously based on an algorithm according to an embodiment of the invention, in particular of sensor data of sensors monitoring the surroundings of the cleaning device and/or sensors monitoring the actual position of the cleaning device. carried out under consideration. Due to this autonomous control, the labor cost for carrying out the method of the present invention can be definitely reduced.

Alternatively, however, the movement of the cleaning device can also be controlled by a person operating the control device in the method according to the invention. Both variants are characterized in that during the actual cleaning there is no need for workers to be present inside the boiler.

Preferably, in particular under the use of a cleaning device or a camera unit integrated in the inspection device, an evaluation of the heat exchanger tube to be cleaned is carried out before carrying out the cleaning and/or an inspection of the cleaning results is carried out after the cleaning, this assessment and /or cleaning results are preferably stored for documentation purposes.

If the movement of the cleaning device is implemented via two vertical support profiles and one horizontally extending guide profile carried thereon movably and vertically, the support profiles are preferably such that the support profiles are aligned with respect to the heat exchanger tubes. extending in parallel, the guide profile having a uniform spacing over its length for the heat exchanger tubes of the frontmost row, such spacing in particular that the shortest distance between the high-pressure surface blaster of the cleaning device and the heat exchanger tubes of the frontmost row is 50 It is positioned inside the boiler in such a way that it is formed so as to be in the range of from 80 to 130 mm, and more preferably still in the range of 80 to 130 mm.

According to a preferred embodiment of the method according to the invention, the supporting profiles are kept in place inside the boiler during further operation of the heat recovery steam generator, so that they only need to be installed during the first cleaning.

Further features and advantages of the invention will become apparent on the basis of the following description of an embodiment of a cleaning system according to the invention with reference to the drawings.

1 is a schematic side cross-sectional view showing a boiler of a heat recovery steam generator with a cleaning system according to an embodiment of the present invention;
FIG. 2 is an enlarged plan view of the anterior region of the device shown in FIG. 1 , and
3 is a schematic plan view of an inspection apparatus.

1 and 2 show a cleaning system 1 according to an embodiment of the invention. The cleaning system 1 is used to clean the ribbed heat exchanger tubes 3 arranged in a row inside the boiler 2 under the use of a cleaning medium from the outside, the boiler 2 is the heat recovery steam of the combined cycle power plant 5 . It forms part of the generator (4).

In the combined power plant 5 , a gas turbine, not shown in more detail, obtains usable energy in a known manner through combustion of a fuel-air mixture. The hot waste gas generated during combustion is additionally guided to a heat recovery steam generator 4 , where it flows through the boiler 2 in the direction of the arrow 6 . At the same time, the water is guided in the direction of the arrow 7 through the heat exchanger tube 3 arranged in the boiler 2 , absorbs the thermal energy of the waste gas and is evaporated. The generated steam is then fed to a steam turbine, not shown in further detail, which drives it.

Due to the high sulfur content of the fuel used in the gas turbine, the waste gas guided through the boiler progressively deposits sulfur on the outside of the heat exchanger tube 3 , thereby increasing the efficiency of the heat recovery steam generator 4 and thus complex The efficiency of the power plant 5 is lowered. Against this background, it is necessary to remove sulfur deposits at regular time intervals, for which the cleaning system 1 is used.

The cleaning system 1 includes, as main components, a pump device 8 and a cleaning device 9 that are connected to each other via a discharge line 10 . The pump device 8 is arranged outside the boiler 2 . Such a pump device compresses the cleaning medium to be used for cleaning the heat exchanger tubes 3 , stored in the cleaning medium container 11 , in this case to at least 30 bar, and in a compressed state into the cleaning device 9 . configured to supply. In this case, the cleaning medium is completely demineralized water with a pH value of 11, mixed with about 25% by weight of ammonia (NH3OH).

In this case, the cleaning device 9 comprises a high-pressure surface blaster 12 and a cleaning lance 13 , both of which are supplied with a cleaning medium via a discharge line 10 . The high-pressure surface blaster 12 is immovably held in the cleaning device 9 . On the other hand, the cleaning lance 13 protruding outwardly from the cleaning device 9 is electrically movable back and forth in the direction of the arrow 14 and is electrically pivotable in the direction of the arrow 15 in a horizontal plane. The cleaning lance 13 defines a fluid channel, which in this case is not shown in more detail, extending through the cleaning lance 13 in the longitudinal direction, the diameter of which preferably ranges from 3 to 8 mm. In this case, the fluid channel leads to two outlet openings 16 arranged in the region of the free end of the cleaning lance 13 and discharging the cleaning medium in different directions, the directions of which are shown in FIG. 2 in the illustrated embodiment. As indicated by dotted lines, they are preferably arranged at an angle α of 90° to each other. Furthermore, the two outlet openings 16 are arranged in the cleaning lance 13 rotatably, as indicated by arrow 18 in FIG. 2 , and a nozzle which is rotated through the cleaning medium itself flowing through the cleaning lance 13 . It is provided on the head (17). The cleaning device 9 as a whole is electrically movable in vertical and horizontal directions according to arrows 19 and 20 . To implement this movement, the cleaning system 1 in this case comprises two vertically extending support profiles 21 , each arranged at a predetermined distance A from one another inside the boiler 2 ; one guiding profile 22 , extending horizontally, arranged parallel to the heat exchanger tubes 3 , and through which the cleaning device 9 is guided, motorized and held therein movably vertically. The guiding profile 22 may be composed of a plurality of partial profiles which together define the length of the guiding profile 22 , as indicated by dashed lines in FIG. 2 . This subdivision may assist in the assembly of the guide profile inside the boiler 2 . The spacing A between the two support profiles 21 is chosen such that this spacing is slightly larger than the length L of the heat exchanger tube rows. The distance between the guide profile 22 and the heat exchanger tubes 3 in the frontmost row is such that the shortest distance a between the high-pressure surface blaster 12 of the cleaning device 9 and the heat exchanger tubes 3 in the frontmost row It is formed to be 100mm. In this case, the motorized vertical movement of the guide profile 22 , and thus of the cleaning device 9 in the direction of the arrow 19 , is caused by two cable drives or chain drives 23 positioned outside the boiler 2 . ), the cables or chains 24 of which are each guided through the boiler opening 25 and fixed to the guide profile 22 . Correspondingly, the guide profile 22 can, under the action of a cable drive or chain drive 23 , move up and down in a guided manner via the rollers 26 on the support profile 21 . In this case, an electric horizontal movement of the cleaning device 9 along the guide profile 22 in the direction of the arrow 20 is effected via a drive unit 27 positioned in the cleaning device 9 . For the control of the movement, the cleaning system 1 has a control device 29 , a cable drive or chain drive 23 , and a drive unit 27 are connected with this control device. For recognition of the final position of the movement of the guide profile 22 along the support profile 21 and of the movement of the cleaning device 9 along the guide profile 21 , devices 28 in the form of limit switches are provided. provided, these devices are likewise connected to the control device 29 . The energy and data supply of the cleaning device 9 can be effected, for example, via a traction cable or the like.

In the illustrated embodiment, the control of the movement of the cleaning device 9 via the control device 29 is autonomous, an algorithm that pre-determines the movements to be carried out of the cleaning device 9 , the cleaning lance 13 and the guide profile 22 . is executed based on To avoid collisions, the cleaning device 9 is provided with one or more sensors 30 , which are data technically connected to the control device 29 and monitor the immediate surroundings of the cleaning lance 13 in relation to potential obstacles. do. In this case, the control device 29 is configured in such a way as to automatically move or stop the cleaning lance 13 so as to avoid collision with the detected obstacle when an obstacle is detected. One or more sensors 30 may be implemented, for example, via suitable spacing sensors. Also preferably, there is provided a sensor system for detecting the actual position of the cleaning device 9 , which sensor system is data-technically connected with the control device 29 , so that this control device compares the actual position with the target position and , can intervene when deviations occur. Since the sensor system consists of a plurality of individual components arranged in different positions, they are not denoted by a single reference numeral in this case. In this case, the cleaning device 9 also includes a camera unit 31 that is data-technically connected to the control device 29; and an illumination unit integrated in the camera unit 31 for illuminating the image area detected by the camera unit 31 .

Alternatively, it is also possible in principle to control the movement of the cleaning device 9 via a person operating the control device 29 . To this end, the camera unit 31 is installed inside the boiler 2 so that the camera unit does not become dirty during cleaning of the heat exchanger tube 3 and that the cleaning device 9 and its cleaning lance 13 are always visible to the operator. should be positioned in

In this case, the cleaning system 1 also comprises, in particular, an analysis device 32 in which images recorded by a camera unit 30 integrated in the cleaning device 9 can be stored, and on these images the inside of the boiler In order to each assign a specific position of , each image is preferably assigned the actual position of the cleaning device 9 detected by the sensor system at the time of image creation. In this case, the analytics device 32 may be maintained on-premises or in the cloud.

For the implementation of the evaluation and/or inspection, the cleaning system 1 is additionally arranged inside the boiler 2 , therein an inspection device schematically shown in FIG. 3 , which is electrically movable in the vertical and horizontal directions ( 33 ), this inspection device being guided in the guide profile 22 like the cleaning device 9 , and can be arranged in a guide profile, for example instead of the cleaning device 9 . For visual evaluation, the inspection device 33 may be provided with a camera unit 31 . For carrying out and documenting the dye penetration test, the inspection device includes, for example, a rotating steel brush 34 for cleaning the area to be inspected; a spray device 35 for applying the dye; a rotating felt brush 36 for wiping off the applied dye; a further spraying device (35) for application of a second medium; And a camera unit 31 for generating a picture; may be provided. For the execution of the ultrasound examination, the examination device 33 may be provided with a spray device 35 for spraying the bonding medium and an ultrasound examination head 37, for example. The camera unit 31 , the steel brush 34 , the spray device 35 , the felt brush 36 and the ultrasonic head 37 , shown only schematically in FIG. 3 , can be arranged together in a single inspection device 33 . have. Alternatively, however, they may be wholly or partly integrated in the cleaning apparatus 9 or distributed among a plurality of inspection apparatuses 33 .

In the following, a method for cleaning the heat exchanger tubes 3 under the use of the cleaning system 1 is described.

In a first step, after the temperature of the boiler is lowered so that the cleaning worker can enter the boiler 2 , the individual components of the cleaning system 1 are assembled as shown in FIGS. 1 and 2 .

In a subsequent step, an evaluation of the actual state can optionally be carried out. For this purpose, state images of the heat exchanger tube 3 are generated by the camera unit 31 of the cleaning device 9 , and each image includes the image of the cleaning device 9 detected through the sensor system at the time of image creation. The actual location is assigned. The data is then sent to the analysis device 32 and stored there.

In a further step, cleaning of the heat exchanger tube 3 is carried out under the use of a high-pressure surface blaster 12 and a cleaning lance 13 . The high-pressure surface blaster oriented in front of the heat exchanger tubes 3 is responsible for cleaning the heat exchanger tubes 3 of the frontmost row of tubes and partial cleaning of the heat exchanger tubes 3 of the row of tubes arranged at the rear thereof. The cleaning lances are respectively inserted into the spaces between the heat exchanger tubes 3 of the frontmost tube row and are responsible for cleaning the heat exchanger tubes 3 of at least the second, third and fourth tube rows. In this way, a very thorough cleaning is achieved.

After carrying out the actual cleaning, the heat exchanger tube 3 can be rinsed again, for example with deionized water. This can be done manually by means of a conventional high-pressure cleaner or likewise using the cleaning device 9 .

In a subsequent step, the cleaning result can be documented, for example, under the reuse of the camera unit 31 of the cleaning device 9 , and even in this case each image has a cleaning device detected via a sensor system at the time of image creation. The actual position of (9) is re-assigned. The data is then likewise transmitted to the analysis device 32 and stored there.

Furthermore, additional tests, such as, for example, dye penetration tests, ultrasound tests, etc., can be carried out, in particular with the use of test devices of the type mentioned above.

In a final step, the cleaning system 1 is disassembled and at least the support profile 21 and the cable drive or chain drive 23 can be kept in place until the next cleaning.

Now, the heat recovery steam generator can be started up again.

Although the present invention has been shown and described in detail in the preferred embodiment, the present invention is not limited to the disclosed embodiment, and other modifications may be devised by those skilled in the art without departing from the protection scope of the invention.

Claims (21)

As a cleaning system (1) for cleaning the ribbed heat exchanger tubes (3) arranged in a row inside the boiler (2) of a heat recovery steam generator (4) of a combined power plant (5) under the use of a cleaning medium, in particular a boiler (2) a pump device (8) arranged externally and configured to discharge the cleaning medium from the one or more cleaning medium containers (11); One or more cleaning devices 9 arranged inside the boiler 2 , electrically movable in vertical and horizontal directions, and connected to the pump device 11 via a discharge line 10 , for discharging cleaning medium )Wow; A cleaning system (1) comprising a; a control device (29) arranged outside the boiler (2) and configured to control the movement of the cleaning device (9). Cleaning system (1) according to claim 1, characterized in that the pump device (11) is configured to compress the cleaning medium to at least 30 bar. 3 . The cleaning system ( 1 ) according to claim 1 , characterized in that the cleaning device ( 9 ) comprises a high-pressure surface blaster ( 12 ) which is preferably immovably held thereon. 4. The cleaning device (9) according to any one of the preceding claims, wherein the cleaning device (9) comprises one or more cleaning lances (13) projecting therefrom and electrically movable back and forth and provided with a fluid channel, such cleaning In the region of the free end of the lance, one or more discharge openings 16 or discharge nozzles, in particular two discharge openings 16 or discharge nozzles, are provided for discharging the cleaning medium in different directions, the discharge directions being preferably 90° to each other. A cleaning system (1), characterized in that it is arranged at an angle (α) of 5 . Cleaning system ( 1 ) according to claim 3 , characterized in that the high-pressure surface blaster ( 12 ) and the cleaning lance ( 13 ) are arranged offset from each other in the vertical direction. Cleaning system (1) according to claim 4 or 5, characterized in that one or more discharge openings (16) or discharge nozzles are provided in a nozzle head (17) arranged in a rotatable cleaning lance (13). ). The cleaning system (1) according to any one of claims 4 to 6, characterized in that the cleaning lance (13) is pivotable in a horizontal plane, in particular electrically pivotable. 8. The device according to any one of claims 4 to 7, wherein one or more sensors (30) are provided in connection with the control device (29), these sensors monitoring the immediate surroundings of the cleaning lance (13) in relation to potential obstructions. and the control device 29 is configured in such a way that, when an obstacle is detected, automatically moving or stopping the cleaning lance 13 so as to prevent a collision with the detected obstacle and/or outputting a warning signal A cleaning system (1), characterized in that it becomes 9. A camera unit (31) according to any one of the preceding claims, wherein the cleaning device (9) is data-technologically connected, in particular to a control device (29) and/or to an analysis device (31) arranged outside the boiler. ), characterized in that an illumination unit for illuminating the image area detected by the camera unit (31) can optionally be provided. 10. An analysis device (32) and data according to any one of the preceding claims, which detects the actual position of the cleaning device (9) and is arranged in the control device (28) and/or outside the boiler (2). A cleaning system (1), characterized in that a technically connected sensor system is provided. 11. The cleaning system according to any one of the preceding claims, characterized in that the cleaning system comprises: two vertically extending support profiles (21), each arranged at a predetermined distance from each other inside the boiler (2); one horizontally extending guide profile 22 , held therein motorically vertically movable, in which the cleaning device 9 is arranged motorically horizontally movable, preferably Cleaning system (1), characterized in that devices (28) are provided for movement of the guide profile (22) and/or for recognition of the respective final position of movement of the cleaning device (9). 12. Cleaning system (1) according to claim 11, characterized in that the guide profile (22) consists of a plurality of partial profiles which together define the length of the guide profile (22). 13. The motorized vertical movement of the guiding profile (22) according to claim 11 or 12, wherein the motorized vertical movement is realized via one or more cable drives or chain drives (23) positioned outside the boiler (2), the cables or chains ( The cleaning system (1), characterized in that 24) is guided through the boiler opening (25) and fixed to the guide profile (22). 14. The boiler (2) according to any one of the preceding claims, wherein at least one inspection device is provided, which is arranged inside the boiler (2) and is motorically movable in the vertical and horizontal directions, these inspection devices in particular for visual evaluation. and/or performing and documenting a dye penetration test and/or performing an ultrasonic test. 15 of the heat recovery steam generator (4) of the combined cycle power plant (5), the heat exchanger tubes (3) arranged in a row inside the boiler (2) of the cleaning system (1) according to any one of claims 1 to 14 A method of cleaning for cleaning under use. 16. The cleaning medium according to claim 15, wherein water mixed with NHOH is used, preferably completely demineralized water mixed with NHOH, wherein the content of NHOH is in particular in the range from 20 to 25% by weight and/or the pH value of the cleaning medium is A cleaning method, characterized in that in particular in the range from 10 to 12. 17. The cleaning device (9) according to claim 15 or 16, wherein the movement control of the cleaning device (9) via the control device (29) is autonomous based on an algorithm, in particular sensors monitoring the surroundings of the cleaning device (9) and/or cleaning A cleaning method, characterized in that it is carried out under consideration of the sensor data of the sensors monitoring the actual position of the device (9). Method according to claim 15 or 16, characterized in that the movement of the cleaning device (9) is controlled by means of a person operating the control device (29). The evaluation of the heat exchanger tube (3) according to any one of claims 15 to 18, in particular under the use of a cleaning device (9) or a camera unit (31) integrated in the inspection device, before the execution of cleaning. is carried out and/or inspection of the cleaning results is carried out after cleaning, such evaluation and/or cleaning results are preferably stored for documentation purposes. 20. A method for cleaning a heat exchanger tube according to any one of claims 15 to 19, under use of a cleaning system (1) according to any one of claims 11 to 13, comprising:
The support profiles 21 are such that the support profiles extend parallel to the heat exchanger tubes 3 and the guide profile 22 is evenly spaced over its length with respect to the heat exchanger tubes 3 in the frontmost row. and this spacing is in particular the shortest distance a between the high-pressure surface blaster 12 of the cleaning device 9 and the heat exchanger tubes 3 of the most forward row in the range of 50 to 200 mm, more preferably still in the range of 80 to Cleaning method, characterized in that it is positioned inside the boiler (2) in such a way that it is formed so as to be in the range of 130 mm. Method according to claim 20, characterized in that the supporting profiles (21) are held in place inside the boiler (2) during further operation of the heat recovery steam generator (4).

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