Equipment for operating the solution gun of a recovery boiler, a recovery boiler, and a method for operating this equipment.
The solution burner rack with actuators and an automatic hatch addresses the limitations of existing racks by providing flexible positioning and orientation, ensuring safe and efficient maintenance of solution guns in recovery boilers.
Patent Information
- Authority / Receiving Office
- JP · JP
- Patent Type
- Applications
- Current Assignee / Owner
- ANDRITZ OY
- Filing Date
- 2024-01-23
- Publication Date
- 2026-06-10
AI Technical Summary
Existing solution burner racks for recovery boilers face limitations in usability and operational safety due to the need for frequent maintenance of spray nozzles under harsh conditions, with limited flexibility in positioning and orientation adjustments, and hazardous manual operations during maintenance.
A solution burner rack equipped with actuators and a control unit for independent movement and adjustment of the solution gun, featuring an automatically opening and closing hatch, allowing flexible positioning and orientation, and automated maintenance operations to reduce safety risks.
Enhances operational safety and efficiency by enabling quick, safe, and direct maintenance without exposing operators to hazardous areas, improving the usability and maintainability of the solution supply system.
Smart Images
Figure 2026518894000001_ABST
Abstract
Description
Technical Field
[0005]
[0001] The present invention relates to equipment for operating a solution lance of a recovery boiler, a recovery boiler, and a method for operating this equipment.
Background Art
[0002] By using a solution supply system having a plurality of solution lances provided with spray nozzles inside the furnace through respective solution lance openings in the wall of the recovery boiler, black liquor, which is the main fuel of the recovery boiler, is sprayed into the furnace of the recovery boiler. The solution burner rack is a device for holding the solution lances, and thus it is an important part of such a supply system as it is a device that performs movements to move the solution lances into the recovery boiler or out of the recovery boiler when black liquor is supplied into the furnace of the recovery boiler. The solution burner rack is also used to hold the solution lances when the solution lances are retracted outside the furnace for maintenance work such as cleaning of its spray nozzles or replacement of new spray nozzles.
[0003] Known solution burner racks, or corresponding solution lance handling / holding devices, are described in, for example, publications FI20216129A1, US Patent No. 8444736 (B1), US Patent No. 7475645 (B2), EP2199457A, and US Patent No. 8443764 (B2).
[0004] Since the environment in the area around the recovery boiler is severe, the solution lance handling / holding equipment must be constructed very robustly. Nevertheless, due to the physical and chemical attack conditions in the area where they are operated, the solution lances, specifically their spray nozzles, need to be maintained relatively frequently. For example, the spray nozzles of the solution lances extend inside the furnace and are thus constantly exposed to high temperatures and the influence of black liquor. Therefore, the nozzles of the solution lances must be cleaned, repaired, or replaced regularly.
[0005] Because hot black liquor can be sprayed or ejected from the furnace, conditions in the area of the recovery boiler plant near the solution gun opening are extremely dangerous. Therefore, for safety reasons, it is important that any operations performed by employees on the solution gun in that area be carried out by avoiding these dangerous areas as much as possible, and thus remaining outside the range from which hot black liquor may be sprayed or ejected.
[0006] Thanks to recent developments, the usability and maintainability of solution gun holding equipment have been greatly improved. However, there are still several issues that need further improvement regarding the performance and operational safety of solution burner holding equipment. For example, the methods for moving and adjusting the position and orientation of the solution gun and its spray nozzle during use, when the spray nozzle extends inside the furnace, and during maintenance work, when the entire solution gun is sent outside the furnace, are still quite limited in many cases. Therefore, considering the problem from this perspective, for example, currently known equipment such as solution burner racks and their usability need to be further improved, both during the spraying phase and when maintenance work on the solution gun is performed. [Prior art documents] [Patent Documents]
[0007] [Patent Document 1] FI20216129A1 [Patent Document 2] U.S. Patent No. 8444736(B1) [Patent Document 3] US Patent No. 7475645 (B2) [Patent Document 4] EP2199457A [Patent Document 5] US Patent No. 8443764(B2) [Overview of the Initiative] [Problems that the invention aims to solve]
[0008] An object of the present invention is to provide equipment for operating a solution gun configured to supply black liquor to the combustion furnace of a recovery boiler, thereby further improving the usability and maintainability of the solution supply system of the recovery boiler. Furthermore, an object of the present invention is to provide a recovery boiler equipped with such a solution supply system including one or more of the equipment according to the present invention, and a method for operating such equipment. [Means for solving the problem]
[0009] The present invention provides a device that can be tilted manually or automatically to any desired position, freely and independently of other movements, by using respective actuation and / or control elements mounted to enable flexible and effective movement of the solution gun, which is held in a solution burner rack, thereby allowing the solution gun and its spray nozzle to be moved back and forth in the direction of moving in and out of the furnace, and the solution gun to be raised or lowered (i.e., moved vertically), and the solution gun to be tilted manually or automatically to any desired position, which is independently operated in accordance with the movement of the solution burner rack, thereby achieving the object of the present invention. More specifically, the device for operating a solution gun of a recovery boiler according to the present invention is characterized by being described in independent claim 1, the recovery boiler according to the present invention is characterized by being described in independent claim 13, and a method for operating the device according to the present invention is characterized by being described in independent claim 14. Dependent claims 2 to 12 describe advantageous embodiments of the device according to the present invention, and dependent claims 15 and 16 describe advantageous embodiments of a method for operating the device according to the present invention.
[0010] The advantage of the equipment according to the present invention is that the operation of the solution gun becomes safer and more flexible for the recovery boiler operator, because, thanks to the automatically opening and closing solution gun opening hatch, these dangerous operations do not need to be performed manually, as the solution gun opening always opens automatically when the solution gun is moved into the furnace and closes when the solution gun is ejected from the furnace. A further advantage of the equipment according to the present invention is that, thanks to its solution burner rack having the ability to independently perform various adjustments of the solution gun (i.e., horizontal position, vertical position, and tilt angle), the position and orientation of the solution gun can be freely adjusted to any desired position and orientation within the space of the solution spray opening area of the recovery boiler. These features of the equipment allow the solution gun to be perfectly set according to the combustion conditions in the furnace, and thus highly efficient and complete combustion of the black liquor introduced into the furnace is achieved. Furthermore, thanks to the combination of such adjustment capabilities and the automatically operated solution gun opening hatch, the solution gun can be set up in the appropriate position more quickly and easily when it is removed from the recovery boiler, and necessary maintenance work can be performed. This improves the performance of the solution supply system and makes its maintenance more direct and time-saving. Thanks to the automatic opening and closing hatch, when the hatch is in the open position, the recovery boiler operator does not need to spend any time in the hazardous area near the solution gun opening. Therefore, thanks to the aforementioned features, the device also allows all maintenance and management work on the solution supply system to be performed while reducing safety risks.
[0011] The advantages of the recovery boiler according to the present invention are that it has the aforementioned automatically opening and closing solution gun opening hatch and independently functioning position adjustment of the solution gun on the solution burner rack, which allows the solution gun of the solution spray system to be positioned in a more optimal manner, thereby improving the efficiency and operational safety of the recovery boiler. Furthermore, thanks to the aforementioned flexible adjustment capability and ease of use of the solution gun, which result from the aforementioned features of the equipment connected to the furnace within such a recovery boiler, maintenance work on the solution supply system can be performed more safely and effectively, thus improving the maintainability of the recovery boiler.
[0012] The advantages of the method for operating a solution burner rack according to the present invention are that it enables the possibility of adjusting and setting the position and orientation of the solution gun in a desired manner, as well as the possibility of moving the solution gun into or out of the furnace. Furthermore, thanks to the method according to the present invention, the cleaning of spray nozzles and the replacement of solution guns can be performed more quickly, more safely, and in a more direct manner, and in the case of a fully automated system, it can be performed without the need for an operator to enter the hazardous area of the recovery boiler plant during operation.
[0013] The present invention will be described in more detail below with reference to the attached drawings. [Brief explanation of the drawing]
[0014] [Figure 1] This figure shows an embodiment of a device comprising a portion of the recovery boiler wall and a solution burner rack equipped with actuator-based operating elements, and is a diagonal side view of the solution burner rack assembled in the recovery boiler when the solution gun held by the solution burner rack extends into the furnace of the recovery boiler. [Figure 2]This figure shows another embodiment of the equipment comprising a portion of the recovery boiler wall, and a solution burner rack and spray nozzle cleaning device, which are operated by a manually operated element, and is a view from the rear at an oblique angle when the solution burner rack assembled in the recovery boiler is in a position where the solution gun held by the solution burner rack is retracted outside the furnace of the recovery boiler. [Figure 3] This figure shows an example of the equipment in Figure 2, viewed from an oblique side angle without the recovery boiler wall section. [Figure 4] Figures 2 and 3 show the front of the solution gun and the spray nozzle cleaning device, respectively, and are viewed obliquely from the inside of the furnace, with the solution gun extending into the furnace through the solution gun opening in the recovery boiler wall. [Modes for carrying out the invention]
[0015] Figures 1 to 4 show several embodiments of the apparatus according to the present invention, many of which are identical to one another, but also some differences. In the embodiment shown in Figure 1, the movement of the solution burner rack 10 and the movement of the solution gun 20 relative to the solution burner rack 10 are both achieved by actuators 17 to 19, whereas in the embodiments shown in Figures 2 and 3, linear movement and tilting are performed by manually operated actuation elements. Figures 1 and 3 show embodiments in which the solution burner rack 10 is equipped with a spray nozzle cleaning device 21.
[0016] The apparatus according to the present invention, for example, the embodiment shown in Figures 1 to 4, is typically assembled in a recovery boiler plant in front of the solution gun opening 101 in the wall 102 of the recovery boiler 100. Thus, the spray nozzle 22 of the solution gun 20 can be moved by applying the function of the solution burner rack 10 into the furnace, i.e., to the positions shown in Figures 1 and 4, and also completely outside the wall of the recovery boiler, i.e., to the position shown in Figure 2. To achieve this, since the solution gun 20 itself usually does not have means to move and set it relative to the solution gun opening 101 of the recovery boiler 100, the solution burner rack 10 must have certain functions. Therefore, these functions of the solution burner rack 10 also play an important role in these technical problems that the present invention tends to solve.
[0017] The solution burner rack 10 in the embodiment shown in Figures 1 to 4 comprises a base 11 and a frame 12 movably positioned on the base 11. The base 11 allows the frame 12 to be mounted on the outside of the recovery boiler 100, and thus the frame 12 is movable along the base 11 toward or toward the solution gun opening 101 in the recovery boiler wall 102. In these solution burner racks 10, mounting is performed by a bracket 11a at the front end of the base 11. The bracket 11a has a flange with threaded holes, through which the flange can be attached to the recovery boiler wall 102 by screws or corresponding fastening elements. Such mounting allows the solution burner rack 10 of the equipment to be fixed in its intended position with minimal additional support structure in the area of the solution gun opening 101.
[0018] In all of the embodiments shown in FIGS. 1 to 4, the solution burner rack 10 also includes a holder 13 for holding the solution gun 20 within the frame 12. With respect to the inclined axis TX shown in FIGS. 1 and 3, the holder 13 is attached to the frame 12 so as to be movable vertically and rotatable. The inclined axis TX is preferably perpendicular to the direction of the forward and backward movement of the frame 12 and the holder 13. The inclined axis TX is formed by providing a pivot joint between the frame 12 and the holder 13, and as a result, the holder 13 can rotate with respect to the frame 12 at an angle. This rotation angle is limited so as to avoid the solution gun 20 hitting the end of the solution gun opening 101. However, the allowable range of the inclination angle has been designed such that the solution gun 20 can be inclined to the maximum extent within the entire cross-sectional area of the solution gun opening 101. Therefore, at the position where the spray nozzle 22 extends inside the furnace, any inclination angle can be freely selected at which the spray nozzle 22 or other parts of the solution gun 20 do not hit the edge of the solution gun opening 101.
[0019] The solution burner rack 10 in Figures 1 to 4 further comprises an entry element 14, a lifting element 15, and a tilting element 16. The entry element 14 is a device configured to move the frame 12 back and forth along the base 11, so that at least a portion of the solution gun 20 held by the holder 13 is movable in and out of the recovery boiler 100 through the solution gun opening 101. The lifting element 15 is a device configured to raise and lower the holder 13 relative to the frame 12, and the tilting element 16 is a device configured to tilt the holder 13 with respect to the tilt axis TX. In embodiments in which these movements are performed manually, the entry element 14, the lifting element 15, and / or the tilting element 16 each have a manually operable mechanism for performing their respective movements, such as a manually operable hand wheel, lever, handle, or some combination thereof. In embodiments having a motor-driven solution burner rack, the entry element 14 includes an entry actuator 17 for moving the frame 12 back and forth along the base 11, the lifting element 15 includes a lifting actuator 18 for raising and lowering the holder 13, and the tilting element 16 includes a tilting actuator 19 for tilting the holder 13. These actuators can be, for example, electric motors, or motors that operate pneumatically or hydraulically, or actuators having linearly moving end effectors (e.g., cylinders). When realizing linear motion, such as the movement of the entry and lifting elements, actuators that form linear motion are advantageous because in such cases there is no need to convert rotational motion into linear motion, and each mechanism is relatively simplified.
[0020] In some embodiments of this device, the functions of the solution burner rack 10 are fully or partially automated. In such embodiments, the solution burner rack 10 may include a control unit (not shown) for automatically controlling the movement of the solution burner rack 10 and / or the holder 13, which is realized by the access actuator 17, the lifting actuator 18, and / or the tilting actuator 19. By automating, the usability of the device is necessarily further improved. Furthermore, since the need to perform manual operations in the area where the aforementioned safety risks exist is reduced, the safety risks to the employees working in this area are also mitigated.
[0021] In the embodiments of the device shown in FIGS. 2 to 4, the solution burner rack 10 includes a spray nozzle cleaning device 21 configured to clean the spray nozzle 22 of the solution gun 20 held by the holder 13. However, such a spray nozzle cleaning device may also be provided in the embodiment of FIG. 1. Usually, the spray nozzle cleaning device 21 includes a cleaning blade 23 movable relative to the spray nozzle 22 by a cleaning blade moving element 24, so that the flakes and deposits formed on the spray nozzle 22 are removed from the spray nozzle 22. For this purpose, the cleaning blade moving element 24 has a mechanism for moving the cleaning blade 23 back and forth along the spray nozzle 22. Also, the spray nozzle cleaning device 21 may be controlled manually and / or automatically. Therefore, the cleaning blade moving element 24 has a manually and / or automatically controllable actuator 25 for moving the cleaning blade 23. The spray nozzle cleaning device 21 further simplifies the maintenance of the solution gun 20 and reduces the need to manually clean the spray nozzle 22. By doing so, the cleaning can also be performed more frequently than when manually cleaned by the operator of the recovery boiler, so the service life of the solution gun 20 and its spray nozzle 22 is extended.
[0022] During the operation of the recovery boiler, deposits and fouling form on the spray nozzle of the solution gun. It has been found that the thickest deposits form on the upper part of the nozzle, immediately after the curved section located on the spray nozzle, before the straight section that ends at the tip of the spray nozzle (the same is true for the solution gun 20 shown in Figures 1-4). Furthermore, it has been found that deposits at the upper end of the spray nozzle in the aforementioned area of the spray nozzle are the most harmful, because deposits burning at high temperatures in these locations tend to degrade the nozzle in the most likely and usually worst possible way. For this reason, the cleaning blades 23 of the spray nozzle cleaning device 21 on the solution burner rack 10 shown in Figures 2-4 have been designed primarily to remove deposits that form on these parts of the spray nozzle 22. As can be seen in Figure 4, this has been achieved by positioning the cleaning blades 23 on both sides of the spray nozzle 22, and as a result extending from below the spray nozzle 22 to at least partially behind the upper end of the spray nozzle 23. Such a cleaning blade, which breaks up deposits on the upper end and both sides of the spray nozzle, has been shown in field tests to be the most effective at cleaning deposits, and therefore this configuration is indeed advantageous.
[0023] Alternatively, the cleaning device may be implemented such that the cleaning blade moves over the upper end of the spray nozzle. In such an embodiment, the cleaning device is positioned above the solution gun, which allows for the cleaning blade, corresponding to the cleaning blade shown in Figures 3 and 4, to be positioned upside down (i.e., rotated 180°) such that its horizontal portion rubs against the upper end of the spray nozzle and its vertical flange protrudes downward.
[0024] Embodiments of the apparatus shown in Figures 1 to 4, having a solution burner rack 10, further include a hatch 103 at the solution gun opening 101 of the recovery boiler 100. As can be seen from Figures 1 and 2, the hatch 103 is rotatably mounted to the side of the solution gun opening 101 in these cases, and as a result can rotate in a plane parallel to the plane of the recovery boiler wall 102, and thus can be turned forward of the solution gun opening 101 when used to close the solution gun opening 101, and can be turned away from the solution gun opening 101 when used to open the solution gun opening 101. For safety reasons, it is best that the hatch is configured to be opened and closed by a hatch actuator 104. Thus, in the apparatus according to the present invention, the hatch 103 is always operated by a hatch actuator such as a hatch actuator 104.
[0025] Furthermore, in the equipment shown in Figures 1 to 4, the hatch 103 operates fully automatically, and therefore the hatch actuator 104 is configured to open and close the hatch 103 in response to the movement of the frame 12 of the solution gun rack 10. It is most preferable that this occurs so that the hatch 102 opens when the frame 12 of the solution burner rack 10 moves toward the solution gun opening 101, and the hatch 103 closes when the frame 12 moves toward the solution gun opening 101. Thus, by having the hatch 103 open and close automatically in response to the movement of the frame 13 of the solution burner rack 10, workers of the recovery boiler do not need to enter the hazardous area near the recovery boiler furnace during the operation of the recovery boiler, and the safety of operations of the recovery boiler is greatly improved. Of course, this may be configured to occur independently of the method of controlling or moving the solution burner rack (i.e., it may be configured to operate even in the case of a solution burner rack that is fully or partially controlled and operated manually).
[0026] When operating the equipment shown in Figures 1 to 4 using the method of the present invention, the process includes at least the following steps.
[0027] - The frame 12 of the solution burner rack 10 moves along the base 11 toward the solution gun opening 101 in the recovery boiler wall 102.
[0028] - The hatch 103 is automatically opened by the hatch actuator 104 (i.e., moves away from the solution gun opening 101) just before the frame 12, which has the solution gun 20, reaches near the solution gun opening 101. Alternatively, for example, the hatch 103 can be opened just before the frame 12 of the solution burner rack 10 begins to move.
[0029] - The frame 12 of the solution burner rack 10 moves further along the base 11 toward the recovery boiler (100), so that at least a portion of the solution gun 20 moves into and / or out of the recovery boiler 100 through the solution gun opening 101.
[0030] - The solution gun 20 is raised and / or lowered relative to the frame 12 of the solution gun rack 10 by raising and / or lowering the holder 13 to a selected height using the lifting element 15.
[0031] - By using the tilting element 16 to tilt the holder 13 in a desired direction, the solution gun 20 is tilted with respect to the tilting axis TX of the holder 13.
[0032] Thanks to the design of the solution burner rack 10, the latter two stages can be performed at least partially simultaneously, or as a whole, independently of each other. These adjustments to the vertical position and orientation of the solution gun 10 make the solution burner rack 10 very flexible and easily adaptable to the other functions of the recovery boiler 100. For example, this allows the holder 13 to be tilted and raised and lowered simultaneously, so that the solution gun 20 can be tilted with respect to a virtual axis of rotation at a desired position, for example, with respect to the spray nozzle 22.
[0033] Furthermore, in embodiments in which the solution burner rack is equipped with a spray nozzle cleaning device 21, cleaning of the spray nozzles 22 using the spray nozzle cleaning device 21 may be performed during, after, or before any of the aforementioned steps. Thus, cleaning of the spray nozzles 22 by using the spray nozzle cleaning device 21 is possible when the spray nozzles 22 are located inside the furnace (as shown in Figure 4), or when the solution burner rack 10 is moving in a position where the solution gun 20 is located outside the furnace.
[0034] To be on the safe side, when the solution gun moves out of the recovery boiler, the hatch 103 automatically closes after the frame 12 has moved a sufficient distance, so that the solution gun 20 is at least outside the solution gun opening 101, or preferably completely outside the recovery boiler wall 102.
[0035] It should be noted that the apparatus, recovery boiler, and method of operating the apparatus according to the present invention may be carried out in many ways that deviate from the embodiments described above. For example, in some embodiments, only the entry element of the solution burner rack has an actuator to enable movement of the frame along the base, while the lifting and tilting movements may be carried out by manually operated lifting and tilting elements. Alternatively, any other element among the entry element, lifting element, or tilting element may be equipped with an actuator, if one or two of the others have manually operated actuators. However, a recovery boiler equipped with the apparatus according to the present invention always has an automatically operated hatch for closing the solution gun opening. In various embodiments of the apparatus, this hatch may be rotated or positioned over the solution gun opening in a manner different from that described above. For example, instead of rotating the hatch, it may be configured to move horizontally to either side of the solution gun opening, or vertically above or below the solution gun opening. Furthermore, the method of operating the solution burner rack of the apparatus may include one or more further method steps. For example, there may be a stage where the solution burner rack moves further back from the position where the spray nozzle is being cleaned or replaced, i.e., to a position where the entire solution gun is removed from the holder, or a position further away from the furnace of the recovery boiler, allowing some maintenance work on other parts of the solution burner rack to be performed more safely.
[0036] Therefore, the present invention is not limited to the embodiments described above, but can be modified within the scope of the appended claims.
Claims
1. An apparatus for operating a solution gun (20) of a recovery boiler (100), wherein the apparatus comprises a solution burner rack (10), The aforementioned solution burner rack (10) -Base (11), - A frame (12) is movably mounted on a base (11) located on the outside of the recovery boiler (100), wherein the frame (12) is movable back and forth along the base (11) in a direction toward the solution gun opening (101) in the wall (102) of the recovery boiler (100), - A holder (13) for holding a solution gun (20) within the frame (12), the holder (13) being mounted so as to be movable up and down within the frame (12) and so as to be rotatable with respect to an inclination axis (TX) perpendicular to the direction of forward and backward movement of the frame (12) and the holder (13), - An entry element (14) configured to move back and forth along the base (11) of the frame (12), wherein at least a portion of the solution gun (20) held by the holder (13) is movable into or out of the recovery boiler (100) via the solution gun opening (101), - A lifting element (15) configured to raise and lower the holder (13) relative to the frame (12), - An inclined element (16) configured to inclinate the holder (13) with respect to the inclined axis (TX) and Equipped with, The apparatus further comprises a hatch (103), the hatch (103) being positioned in the solution gun opening (101) and configured to be opened and closed by a hatch actuator (104), wherein the hatch actuator (104) is configured to automatically open and close the hatch (103) in response to the movement of the frame (12) of the solution burner rack (10), the hatch (102) opening when the frame (12) moves toward the solution gun opening (101), and the hatch (103) opening when the frame (12) moves toward the solution gun opening (101).
2. The apparatus according to claim 1, wherein the entry element (14), the lifting element (15), and / or the tilting element (16) are each equipped with a manually operable handwheel, lever, handle, or combination thereof for performing their respective movements.
3. The apparatus according to claim 1 or 2, wherein the entry element (14) comprises an entry actuator (17) for moving the frame (12) back and forth along the base (11).
4. The apparatus according to any one of claims 1 to 3, wherein the lifting element (15) comprises a lifting actuator (18) for raising and lowering the holder (13).
5. The apparatus according to any one of claims 1 to 4, wherein the tilting element (16) comprises a tilting actuator (19) for tilting the holder (13).
6. The apparatus according to any one of claims 3 to 5, wherein the entry actuator (17), the lifting actuator (18), and / or the tilting actuator (19) are manually controllable.
7. The apparatus according to any one of claims 3 to 6, wherein the solution burner rack (10) comprises a control unit for automatically controlling the movement of the solution burner rack (10) and / or the holder (13), which is realized by the entry actuator (17), the lifting actuator (18), and / or the tilt actuator (19).
8. The apparatus according to any one of claims 1 to 7, further comprising a spray nozzle cleaning device (21) configured such that the solution burner rack (10) cleans the spray nozzle (22) of a solution gun (20) held by the holder (13).
9. The apparatus according to claim 8, wherein the spray nozzle cleaning device (21) comprises a cleaning blade (23) that is movable relative to the spray nozzle (22) by a cleaning blade moving element (24), and at least deposits formed on the upper end portion of the spray nozzle (22) are removed from the spray nozzle (22).
10. The apparatus according to claim 8 or 9, wherein the cleaning blades (23) are arranged on both sides of the spray nozzle (22), and the cleaning blades (23) extend from below the spray nozzle (22) to at least partially behind the upper end portion of the spray nozzle (23).
11. The apparatus according to claim 9 or 10, wherein the cleaning blade moving element (24) includes a mechanism for moving the cleaning blade (23) back and forth along the spray nozzle (22).
12. The apparatus according to any one of claims 9 to 11, wherein the spray nozzle cleaning device (21) comprises a manually and / or automatically controllable actuator (25) for moving the cleaning blade (23).
13. A recovery boiler (100) comprising the equipment described in any one of claims 1 to 12.
14. A method for operating the apparatus described in any one of claims 1 to 12, - A step of moving the frame (12) of the solution gun rack (10) along the base (11) toward the solution gun opening (101) in the recovery boiler wall (102), - The steps of automatically opening the hatch (103) by moving the hatch (103) of the device away from the solution gun opening (101), - A step of moving the frame (12) of the solution gun rack (10) further toward the recovery boiler (100) along the base (11), such that at least a portion of the solution gun (20) moves into the recovery boiler (100) through the solution gun opening (101), - The step of raising and / or lowering the solution gun (20) relative to the frame (12) of the solution gun rack (10) by raising and / or lowering the holder (13) using the lifting element (15), - The step of tilting the holder (13) with respect to the tilt axis (TX) of the holder (13) by tilting the holder (13) using the tilt element (16) and Methods that include...
15. The method according to claim 14, further comprising the step of cleaning the spray nozzle (22) using the spray nozzle cleaning device (21).
16. The method according to claim 14 or 15, comprising the step of moving the frame (12) of the solution gun rack (10) along the base (11) away from the recovery boiler (100) to a position where the solution gun (20) is located at least outside the solution gun opening (101), and moving the hatch (103) over the solution gun opening (101) to automatically close the hatch (103).