Mounting device for a cleaning device based on the introduction of high amplitude pressure waves

Abstract

A mounting device for a cleaning device by introducing a pressure wave through a hollow nozzle (19) into a boiler to be cleaned through an opening in a boiler wall (20) has a housing body (10), which can be mounted on the boiler wall (20) by means of mounting flanges (30, 32) on the boiler side, the hollow nozzle (19) being concentric with the opening in the boiler wall (20) and perpendicular to the boiler axis. In the longitudinal direction of the hollow nozzle (19), damping units (50) are arranged at equal angular intervals around the hollow nozzle (19), each attached at one free end to the mounting flange on the boiler side and each attached at the other free end to the housing body (10). When a pressure wave is triggered, the housing body (10) is elastically held away from the boiler in the longitudinal direction and returned to its initial position.

Description

[Technical field]

[0001] The present invention relates to an installation device for a cleaning device based on introducing a high amplitude pressure wave via a hollow cylindrical nozzle into a boiler to be cleaned through an opening in the boiler wall, the housing body of the cleaning device being mountable to the boiler wall by means of a mounting flange on the boiler side, the longitudinal direction of the hollow cylindrical nozzle being advantageously concentric with the opening in the boiler wall and perpendicular to the boiler axis. [Background technology]

[0002] A cleaning device and a cleaning method for generating high amplitude pressure waves, in particular for boiler cleaning, are known from DE 10 200 03 133 A1. The corresponding device has a discharge opening for conducting and discharging the gas pressure generated in the combustion chamber. This opening is usually a hollow cylinder guided through the boiler wall to be cleaned. For cleaning, the aforementioned high amplitude pressure waves are generated in the device and introduced into the boiler volume when the boiler is not in operation.

[0003] During operation of the boiler cleaning device, the impact of an explosion can induce forces along the longitudinal axis of the device which can damage the mounting of the cleaning device used to attach the device to the boiler wall.

[0004] To overcome this problem, the hollow cylinder for releasing explosive gases can be provided with flanges for mounting the aforementioned device. In this case, corresponding tensile and shear forces act on this connection. In addition to the load on the hollow cylinder itself mounted on the boiler wall, this has the further disadvantage that the device cannot be easily adjusted to different discharge gas volumes. Since the system is usually scaled by using hollow cylinders of different diameters, in this case it is necessary to adapt the system to the correspondingly larger or smaller diameter of the hollow cylinder with the corresponding additional flanges.

[0005] However, most of the time the boiler is in its working functional state and the boiler cleaning device is in its idle functional state. The disadvantage of this is that corrosive gases can flow from the boiler through the hollow cylinder to the discharge opening and then to the valve seat of the piston. These gases can impair the tightness to such an extent that the rapid pressure increase favorable for boiler cleaning is impaired by the deterioration of the valve seat. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2019 / 185736 Summary of the Invention

[0007] Based on this background, it is an object of the present invention to provide a device for the attachment of a boiler cleaning system to a boiler, which requires less force and torque. Another object of the present invention is to improve the attachment so that the boiler cleaning system can be easily adapted to different requirements.

[0008] This problem with regard to a mounting device for a cleaning device is solved by the present invention in which a series of damping units are provided, arranged at equal angular intervals around the longitudinal axis of the hollow cylindrical nozzle, each attached at one free end to a mounting flange on the boiler side and each attached at the other free end to the housing body, so that when the high-amplitude pressure wave is triggered in the cleaning device, the housing body is elastically held away from the boiler in the longitudinal direction and returned to its starting position.

[0009] At the same time, it may be advantageous that maintenance can be performed without the need to completely dismantle the system.Finally, another object of the present application is to prevent corrosive gases from flowing from the boiler through the hollow cylinder to the discharge opening and thus to the valve seat of the piston.

[0010] Advantageously, each damping unit may have a pneumatically or hydraulically controllable damping cylinder and a piston extendable from said damping cylinder, resulting in a retraction unit capable of retracting the cleaning device, in particular when suspended from a pulley above and retractable.

[0011] The damping unit preferably comprises a hydraulic damper which is rotationally symmetrical about the cleaning device tube. The hydraulic damper of the damping unit may have two tension / compression springs arranged in a longitudinal row, which are inserted between the mounting flange on the boiler side and the damping plate or between the intermediate plate and the damping plate, the housing body being fixedly attached to the intermediate plate by a first longitudinal rod and the damping plate being fixedly attached to the mounting flange on the boiler side by a second longitudinal rod, and an additional hydraulic damper being arranged longitudinally around the hollow cylindrical nozzle between the damping plate and the intermediate plate.

[0012] In this case, advantageously, two tension / compression springs of each damping unit, arranged in a longitudinal row, can be arranged around one of the second longitudinal rods and supported directly on the intermediate plate or on a bush on the intermediate plate facing the tension / compression spring, while the associated second longitudinal rod is guided through an opening in the intermediate plate. In particular, the springs are compression springs preloaded in the waiting position.

[0013] In another advantageous embodiment of the damping unit, instead of tension / compression springs, they consist of annular or tire-shaped elastomers arranged in a row, each elastomer being arranged around one of the second longitudinal rods and supported either directly on the intermediate plate or on a bush facing the next elastomer on this intermediate plate, while the associated second longitudinal rod passes through an opening provided in the intermediate plate. In particular, the elastomer may be a copolyester elastomer. Every other elastomer may be provided with a spacer, in particular a metal plate, as a washer, and the second longitudinal rods may be surrounded by a hollow radial guide tube against which the inner edge of the elastomer (= continuous opening on the inside of the torus, facing inwards towards the longitudinal axis of symmetry) abuts, so that the elastomers are arranged with only a small amount of play around their longitudinal axis.

[0014] The boiler-side mounting flange may be part of an integral or composite closure housing having a boiler wall flange which may be attached to the boiler at a longitudinal end opposite the mounting flange.

[0015] The closure housing may have a guide tube in which the hollow cylindrical nozzle is freely guided so that it can be retracted separately.

[0016] Protective cooling of the guide tube and the nozzle can be achieved in that in the installation the guide tube is double-walled and has an internal cavity that runs in a spiral from a feed point into the guide tube in a direction away from the boiler to the front edge of the guide tube, the internal cavity can be supplied with cooling fluid from a fluid source arranged outside the closure housing, and the wall or front edge of the guide tube facing the boiler wall has an opening for the exit of the cooling fluid, so that the guide tube protects the through opening in the boiler wall in the event of pulses, i.e. successive cleaning pulses.

[0017] Advantageously, the mounting flange on the boiler side is movable back and forth in the longitudinal direction of the hollow cylindrical nozzle relative to the boiler wall flange, so that the guide tube can be at least partially withdrawn from an opening in the boiler wall in the rear waiting position, as a result of which the boiler gases can only partially act on the guide tube.

[0018] To protect the nozzle and to simplify maintenance by disconnecting the cleaning device from the installation device, the inside of the closure housing may be provided with closure flaps consisting of two to four closure wings, each of which can be pivoted about a support axis arranged in a tangential direction perpendicular to the longitudinal axis, so that when the hollow cylindrical nozzle is pressed forward through the front edge of the nozzle, it opens by pivoting towards the inner wall of the closure housing. The flaps are arranged in the longitudinal direction such that the actively cooled guide tubes are located in front of the flaps and between them in the longitudinal direction and the boiler wall.

[0019] The closure vane is double-walled and has an internal cavity, which can be supplied with cooling fluid from a fluid source located outside the closure housing, and the wall of the closure vane facing the boiler wall has an outlet opening for the cooling fluid, so that the closure vane itself can also be protected from the temperature and aggressive media in the boiler.

[0020] If a pivot axis is arranged above a housing body for the mounting device, the pivot axis being aligned perpendicular to the longitudinal axis of the hollow cylindrical nozzle of the cleaning device, and the housing body is suspended at the pivot axis via a pendulum arm, the recoil of the cleaning device can be easily absorbed, the pendulum movement in this case combining a larger return movement with a very small height displacement.

[0021] If the pivot axis is attached to a pulley that is movable in the longitudinal direction of the hollow-cylindrical nozzle in a pulley profile provided above the hollow-cylindrical nozzle, the cleaning device can also be easily retracted, which is particularly possible when an active pneumatic or hydraulic lifting cylinder is used in the damping unit.

[0022] Further embodiments are set forth in the dependent claims.

[0023] Preferred embodiments of the present invention will now be described with reference to the drawings, which are for illustrative purposes only and are not to be construed as limiting. [Brief description of the drawings]

[0024] [Figure 1] 1 is a schematic side view illustrating an installation arrangement for a boiler cleaning apparatus according to one embodiment of the invention with a cleaning pipe having a larger diameter. [Diagram 2] FIG. 11 is a schematic side view showing a mounting arrangement for a boiler cleaning apparatus according to one alternative embodiment of the present invention. [Diagram 3] FIG. 2 is a perspective view of the boiler cleaning device shown in FIG. [Figure 4] FIG. 2 is a side view of the boiler cleaning device shown in FIG. [Diagram 5] 3 is a schematic side view of the boiler cleaning apparatus shown in FIG. 2, but with a cleaning pipe having a smaller diameter than the embodiment shown in FIG. [Figure 6] FIG. 6 is a perspective view of the boiler cleaning device shown in FIG. 5. [Figure 7] 3 is a schematic partial cross-sectional side view of the boiler cleaning device shown in FIG. 2. [Figure 8A] 3 is a schematic partial cross-sectional side view of the boiler cleaning apparatus shown in FIG. 2 in an idle or standby position; FIG. [Figure 8B] 8B is a schematic partial cross-sectional side view of the boiler cleaning apparatus shown in FIG. 8A in a cleaning or advanced position. [Figure 8C]8B is a schematic partial cross-sectional side view of the boiler cleaning apparatus shown in FIG. 8A in a partially disassembled maintenance or retracted position; [Figure 9] FIG. 8 is a schematic perspective view showing a 120-degree segment closure of the boiler cleaning apparatus shown in FIG. 7. [Figure 10] FIG. 10 is a schematic partial cross-sectional perspective view of the 120 degree segment closure shown in FIG. [Figure 11] FIG. 11 is a schematic perspective view, partially in perspective, of one segment of the 120-degree segment closure shown in FIG. 10. [Figure 12A] Shown above is a side view, on the left a plan view of the 120 degree segment closure in the area of ​​the closure housing, and on the right a plan view from the boiler, in both cases the 120 degree segment closure is closed as when in standby or maintenance position. [Figure 12B] Shown above is a side view, on the left a plan view of the 120 degree segment closure in the area of ​​the closure housing, and on the right a plan view from the boiler, in both cases the 120 degree segment closure is partially open in the transition between the standby position and the cleaning position. [Figure 12C] Shown above is a side view, on the left a plan view of the 120 degree segment closure in the area of ​​the closure housing, and on the right a plan view from the boiler, in both cases the 120 degree segment closure is open as it is in the cleaning position. [Figure 13] FIG. 2 is a perspective side view showing a ventilation device for a guide tube. [Figure 14] FIG. 7 is a partial cross-sectional side view of an assembly group of damping units such as those shown in FIG. 4 or FIG. 6. [Figure 15] FIG. 13 is a schematic perspective view of a mounting arrangement for a boiler cleaning device according to another example embodiment with an elastomer in the damping unit. [Figure 16] FIG. 16 is a side view of the boiler cleaning apparatus as shown in FIG. [Figure 17]FIG. 13 is a partial side cross-sectional view of an assembly of elastomers with optional guide tubes around the longitudinal rods. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0025] FIG. 1 is a schematic side view of a boiler cleaning device according to an embodiment of the invention, which includes a shock wave generator 10 elastically attached to a boiler 20. Elastic means that the shock wave generator 10 is not fixedly attached to the boiler wall 20, but is elastically movable in the longitudinal direction (back and forth) of the generated shock waves. The shock wave generator 10 has a hollow cylinder 19 that guides the pressure waves generated by the shock wave generator 10 into the boiler. The hollow cylinder 19 is inserted into a boiler connection piece 31. The boiler connection piece 31 is connected to a boiler wall flange 30, which is arranged on the boiler wall 20 from the outside and is rigidly connected to the boiler wall 20. The boiler access is defined by the boiler wall 20. The boiler connection piece 31 has a mounting flange 32 on the opposite side of the longitudinal direction of the hollow cylinder 19 to the boiler wall flange 30. This boiler-side mounting flange 32 is therefore fixedly connected directly to the boiler wall flange 30 via the guide tube 31. The cleaning device-side mounting flange 40 is fixedly connected to the boiler-side mounting flange 32 and holds the shock wave generator 10 via a series of second longitudinal or tension rods 154, here three, around which damping spring assemblies 150, 156 are arranged. Each damping unit 150, 156 has two tension / compression springs 150, 156 arranged in a longitudinal row, which are inserted between the boiler-side mounting flange and the intermediate plate 151 or between the intermediate plate 151 and the damping plate 152. The springs 150, 156 are supported either directly on the intermediate plate 151 or on bushes 154 facing the ends of the springs on this intermediate plate 151, while the associated second longitudinal rod 154 is guided through an opening in the intermediate plate 151.Since the housing body 10 is fixedly attached to the intermediate plate 151 by a first longitudinal rod 155, and the damping plate 152 is fixedly attached to the boiler-side mounting flange by a second longitudinal rod 154, when cleaning is performed, the hydraulic cylinder is compressed and then restored to absorb most of the reaction force, the remainder being absorbed by the spring assembly.

[0026] The three damping spring assemblies 150, 156 are arranged at angular intervals of 120 degrees circumferentially around the longitudinal axis of the hollow cylinder 19. There may be more than four such sets, for example six or eight, preferably arranged at equal angular intervals. In addition to the damping spring sets 150, 156, hydraulic dampers 250 are provided between the intermediate plate 151 and the damping plate. The number of hydraulic dampers 250 may be one or two between each of the three damping spring sets 150, 156, i.e. three or six in total. If there are four, six or eight damping spring assemblies 150, the same number of hydraulic dampers 250 may be arranged at equal angular intervals from each other, if possible. The hydraulic dampers 250 typically absorb 50% to 90%, usually more than 75% to 90%, for example 80% to 90%, of the recoil energy. Another advantage of the hydraulic damper 250 is that the reaction force is distributed evenly over the entire stroke, as compared to the spiral springs of the spring assemblies 150,156.

[0027] When the pressure wave impact of the shock wave generator 10 is guided longitudinally from the boiler wall 20 into the boiler through the tube of the hollow cylinder 19, the granular pressure damper 250 expands and contracts due to the reaction of the shock wave generator 10 based on the flow dynamics within the damper, and in parallel therewith, the damping springs 150, 156 expand and contract, and the shock wave generator 10 moves longitudinally away from the boiler wall 20.

[0028] Advantageously, the weight of the shock wave generator 10 is supported by a holding lever 12 via a holding chain 11, which is attached via a horizontal pivot 13 to a support frame 14, which is in turn attached via a pulley 16 to a pulley profile 15 in the longitudinal direction of the hollow cylinder 19, so that it can be moved longitudinally. The holding chain 11 is of such a length that the axis of symmetry or longitudinal axis of the shock wave generator 10 coincides with the axis of symmetry or longitudinal axis of the boiler nozzle 31 and the boiler wall flange 30, i.e. they are coaxial. In this way, the pressure wave is emitted about the same axis as the axis of the boiler outlet and the recoil is ideally absorbed.

[0029] The axis of the pulley profile 15 is advantageously arranged in a vertically parallel plane containing the longitudinal axis of the shock wave generator 10 described above, which makes it possible to pull the shock wave generator unit with the hollow cylinder 19 backwards directly from the boiler nozzle 31.

[0030] A schematic side view of a boiler cleaning apparatus according to a further embodiment of the invention is shown in Figure 2. As in the embodiment shown in Figure 1, the cleaning pipe 19 has a larger diameter. The term "larger diameter" is to be understood as a comparison with the embodiment shown in Figure 5.

[0031] In all figures, identical features are given the same reference numbers. The difference between the two devices shown in figures 1 and 2 lies especially in the type of mounting and damping. Whereas the design shown in figure 1 has a series of damping spring assemblies 150, 156 arranged circumferentially, here three damping cylinders 50 are provided at an angular interval of 120°. These damping cylinders 50 have the same function as hydraulic dampers. The only difference is that no spring assemblies are provided. In the design shown in figure 2, the combination of the boiler-side mounting flange 32, the boiler connection piece 31 and the boiler wall flange 30 shown in figure 1 is replaced by a closure housing 60, which has the same function. Another difference lies in the presence of a number of air connections 70 arranged at 120° intervals on a circumferential circle, which are operatively connected to butterfly valves 80, which will be explained in the following description. Inside the shutter housing 60 there is a 120° closure 81 of the shutter 80, which will be explained below.

[0032] The approximately triangular convex mounting flange 40 on the side of the cleaning device has abutments for three damping cylinders 50 attached to its corners. A piston 51 protruding from the opposite side of the damping cylinder 50 is attached to the shock wave generator 10, which is only shown here diagrammatically as a simple cylinder. In other words, the weight of the shock wave generator 10 acts with a corresponding moment on the mounting flange 40. It is also possible that the damping cylinders 50 are supported via a support plate (not shown in FIG. 2) with openings for the damping cylinders 50 and a central hole on the connecting tube 43 for the connecting tube 43.

[0033] The hollow cylinder 19 is inserted into the connecting tube 43. The weight of the shock wave generator 10 can also be transferred by tilting it with play, but it is preferably inserted freely into the tube 43. When an explosion is triggered by the shock wave generator 10 for cleaning the boiler, the shock wave travels through the hollow cylinder 19 in the longitudinal direction of the cleaning device, and the shock wave generator 10 moves in recoil in the opposite direction to the boiler wall 20. The damping cylinder 50 has a damping effect on this movement and pulls the shock wave generator back again after an initial large amplitude. This can be achieved in particular by using a damping cylinder 50 acting as a hydraulic cylinder, in which a piston 51 can be extended and retracted in a correspondingly controlled manner.

[0034] Another advantage of using the damping cylinder 50 over the damping spring 150 will become apparent in conjunction with the discussion of Figures 8A-8C.

[0035] 3 shows a perspective view of the boiler cleaning device according to FIG. 1. FIG. 4 shows a side view of the boiler cleaning device according to FIG. 1. The three damping spring assemblies are clamped in two sections by individual springs 150, 156 between the damping plate 152, the intermediate plate 151 and the mounting flange 40 on the side of the cleaning device. In the mounting flange 40, a series of flange connection screws 41 can also be recognized, by means of which the mounting flange 40 is attached to the mounting flange 32 on the boiler side or to the corresponding flange of the closure housing 60. In other words, a closure housing 60 with internal closure flaps and / or vents may also be used with the configuration shown in FIG. 3, even if further advantages arise only in connection with the retractable generator 10 shown in FIG. 2. The damping springs 150, 156 are guided through openings in the damping plate 152 and the mounting flange 40 and are clamped on the outside in each case. The intermediate plate 151 has an opening for passing a second tension rod 154, which abuts against a sleeve 157 provided on either side of the intermediate plate 151, the sleeve 157 separating the spring action of the two sections, the section up to the damping plate 152 and the section up to the mounting flange 40.

[0036] The hydraulic damper 250 is located between the damping plate 152 and the intermediate plate 151, because the hydraulic damper 250 needs to absorb the initial reaction, and the weaker springs only return the now compressed hydraulic damper.

[0037] Here, a series of six first tension rods 155 are fixedly connected to the intermediate plate 151 at an angular distance of 60 degrees from each other and are attached from the mounting points 153 of the shock wave generator 10, for example by male screws arranged at each end of the first tension rods 155, which pass through the intermediate plate 151 having a cross-section reduced by corresponding holes.

[0038] When the shock wave generator 10 is activated, it moves away from the boiler wall 20 and exerts a tension on the intermediate plate 151 via the tension rod 155, which stretches the right-side damping spring 150 closer to the mounting flange. At the same time, the left-side damping spring 156 on the damping plate side and the hydraulic damper 250 are shortened, which creates a damping movement in the opposite direction when the shock wave generator 10 reaches its maximum distance from the boiler wall 20. The damping springs 150, 156 and the hydraulic damper 250 are designed such that the vibratory movement is minimized.

[0039] The hydraulic damper 250 is mounted on one side of the damping plate 152 and bears against the intermediate plate 151 with a piston and surrounding spring (set 251).

[0040] A hydraulic damper 250 is provided between the damping plate 152 and the intermediate plate 151 in parallel with the spring 156 to reduce the peak force with the same energy absorption.

[0041] 3 it can also be seen that the diameter of the hollow cylinder 19 is the diameter which is guided, with only a small amount of play, through the inner diameters of the mounting flange 40, the intermediate plate 151 and the damping plate 152. This is therefore the maximum diameter of the hollow cylinder 19 which can be used with this cleaning device.

[0042] In Fig. 5 a schematic side view of the boiler cleaning device as shown in Fig. 2, but with a cleaning tube 190 having a smaller diameter, is shown, while in Fig. 6 a perspective view of the boiler cleaning device as shown in Fig. 5 is shown. All the features of the mounting of the shock wave generator 10 to the mounting flange 40 shown in Fig. 5 are the same as those shown in Fig. 3, the only difference being the different design of the discharge tube 190, which now has a significantly smaller diameter. The distance from the outside of the hollow cylinder 190 to the damping plate 152, the intermediate plate 151 and the inner diameter of the flange 40 is therefore significantly greater. It is merely noted to ensure that an inner cover plate 42 with a centrally adapted opening is provided on the mounting flange 40 or a corresponding closure housing 60 which surrounds the tube 190 with a small play and can be simply sealed by a seal. In a preferred embodiment, the mounting flange 40 and the cover plate 42 are one piece, in other words the mounting flange 40 has an inner diameter corresponding to the illustrated cover plate 42, which is selected and mounted according to the diameter of the tube.

[0043] In Figure 14 there is shown a partial cross-sectional side view of an assembly of a damping unit such as that shown in Figure 4 or Figure 6. A hydraulic damper 250 is shown fixed to the plate 152.

[0044] In FIG. 7, a schematic partial cross-sectional side view of the boiler cleaning device shown in FIG. 2 is shown. In FIG. 8A, a similar schematic partial cross-sectional side view of the boiler cleaning device shown in FIG. 2 in the idle state, i.e. in the waiting position, is shown. FIG. 8A corresponds to a reduced version of FIG. 7. In FIG. 8B, a schematic partial cross-sectional side view of the boiler cleaning device shown in FIG. 8A in the cleaning state, i.e. in the forward position is shown. Due to the short decay path, it is practically unimportant whether the cleaning device shown in FIG. 8B is before, during or after the impact of the shock wave. In FIG. 8C, a schematic partial cross-sectional side view of the boiler cleaning device shown in FIG. 8A in a partially disassembled maintenance position, i.e. in the retracted position of the cleaning device is shown. Furthermore, in FIG. 9, a schematic perspective view of a closure flap 80 with three 120° segment closures 81 of the boiler cleaning device shown in FIG. 7 is shown.

[0045] The detailed view shown in FIG. 7 shows that, inside the closure housing 60 tapering towards the boiler wall 20, the closed closure flaps 80 are inserted inside the mounting flange 40 forming the inner shoulder of the closure housing 60. The closed closure flaps 80 form a convex cone projecting towards the boiler wall 20. The closure flaps 80 consist of three 120° closures 81 each covering an angular range of 120°, which can be pivoted about their pivot axes between the closed position shown in FIGS. 7 and 9 and the fully open position shown in FIG. 12C. The 120° closures 81 can thus be pivoted about tangential axes that are perpendicular to the longitudinal axis of the closure housing 60 and lie in a plane at a predetermined distance from the longitudinal axis. These tangential axes are predefined by hollow support shafts 84. Two sliding cylinders 82 are arranged around each hollow support shaft 84, and a return spring 83 is arranged between these sliding cylinders 82, which return the open segment of the 120 degree closure 81 to the locked position.

[0046] In Fig. 8A, the shock wave generator 10 is in a standby position, in which the normal working process takes place in the boiler. In Fig. 8B, the forward movement of the shock wave generator 10 is shown by shortening the piston 51 in the damping cylinder 50, which causes the hollow cylinder 19 to move forward in the guide tube 31 in the direction of the boiler wall 20, so that the front edge of the hollow cylinder 19 abuts against the side of the 120 degree lock 81, which open synchronously with each other against the spring force of the return spring 83. In Fig. 8B, the front edge of the hollow cylinder has already protruded into the boiler, slightly beyond the boiler wall 30.

[0047] The inner shape of the closure housing 60 extends from the shoulder where the location axis 84 is provided for the follower to the boiler wall flange 30 of the housing 60, so that the outward side and surface of the closure 81 itself can be located within this expanded rear space when the shock wave passes through the hollow cylinder 19 guided in the guide tube 31.

[0048] In Fig. 8C the shock wave generator 10 is shown diagrammatically in an exploded state, where the sealing housing 60 with the sealing cap 80 is rigidly attached to the boiler wall 20 via the boiler wall flange 30. On the other hand the damping cylinder 50 is shown exploded and separately, with the subsequent extension showing the shock wave generator 10 with the hollow cylinder 19 attached. Preferably the shock wave generator 10 together with the hollow cylinder 19 is suspended from the sheave profile 15 via the elements shown in Fig. 1, i.e. the holding chain 11, the pivot arm 12 and the sheave 16. If the weight of the shock wave generator 10 and its hollow cylinder 19 is not balanced, it is also possible to provide another mounting chain or rod in addition to the single chain 11.

[0049] In Fig. 9, a schematic perspective view of a 120° segment closure 80 of the boiler cleaning device also shown in Fig. 7 or Fig. 8A is shown. The closure elements 81, which are substantially triangular in plan view, abut each other at their connecting edges and end in a convex tip directed towards the boiler wall 20. The surface directed towards the boiler wall 20 and thus towards the boiler has a number of openings 85 for infusion cooling. In other words, each closure element 81 has a double-walled structure extending to the sliding cylinder 82, so that each individual closure element 81 can be pressurized by cooling ambient air or a corresponding gas via the air connection 70 and the hollow support shaft 84. These pressurized gases flowing into the hollow support shaft 84 then flow through the openings 85 into the space of the openings provided in the boiler wall 20.

[0050] In this connection, Fig. 10 shows a schematic, partially cutaway perspective view of the 120° segment closure 81 shown in Fig. 9. Reference number 71 indicates the flow direction and therefore the volume flow of gas, which flows into the hollow support shaft 84 at the air connection 70, then through a corresponding opening in the wall of the hollow support shaft 84, into a cavity in the double-walled closure member 81 in a sliding cylinder 82, which is also hollow and has an opening into the hollow support shaft 84, and then flows out through an opening 85. In this embodiment of the closure member 81, reinforcing ribs 86 are provided.

[0051] 11 shows a schematic perspective view, partly in perspective, of one segment 81 of the 120° segment closure 80 shown in FIG. 10, which in particular shows the regularly distributed openings 85 and the substantially radially extending reinforcing struts 86. From the thickness of the transition between the sliding cylinder 82 and the closure member 81, the passages for the volume flow 71 can be seen.

[0052] In Fig. 12A, a side view is shown at the top, a plan view of the 120° segment closure in the area of ​​the closure housing on the left and a plan view from the boiler on the right, in both cases the 120° segment closure 80 is closed as it is in the standby or maintenance position, i.e. as it is during normal boiler operation. In Fig. 12B, a side view is shown at the top, a plan view of the 120° segment closure 81 in the area of ​​the closure housing 60 on the left and a plan view from the boiler on the right, in both cases the 120° segment closure 81 is partially open during the transition between the standby and cleaning positions. In Fig. 12C, a side view is shown at the top, a plan view of the 120° segment closure 81 in the area of ​​the closure housing 60 on the left and a plan view from the boiler on the right, in both cases the 120° segment closure 81 is open as it is when the cleaning position is reached, while cleaning is taking place or immediately afterwards. The sequence of these figures shows that the closure member 81 is fully open, thereby allowing the hollow cylinder 19 to pass through the closure member 81.

[0053] The individual closing elements 81 are pushed open by the leading edge of the hollow cylinder 19 until the leading ends of the closing elements are supported on the outside of the hollow cylinder 19 and, if necessary, the hollow cylinder 19 is pushed further into the boiler wall area.

[0054] In Fig. 13, a perspective side view of the ventilation device for the guide tube 31 is shown. The mounting flange 32 is here attached to an improved closure housing 60' connected to the boiler wall flange 30, but is longitudinally movable relative to the boiler wall flange 30. For this purpose, a sealing perforated plate 35 is arranged on the side of the guide tube facing away from the outer casing. For this purpose, a perforated flange 34 is attached to the boiler wall flange 30, which on the side facing the boiler 20 has a receptacle into which the perforated plate 35 can be inserted. The perforated plate 35 surrounds the guide tube 38 and is movable in particular in height so that it can follow the expansion of the boiler and thus the height changes of the through opening 22 in the boiler wall 20 relative to the guide tube 38. This means that the reaction forces acting on the mounting flange 32, which would normally act on the boiler wall 20, but on the separately supported closure housing 60' are mechanically decoupled, so that temperature or assembly-related misalignments of the guide tubes 38 can be absorbed by the displaceable plate 35 which is mounted with play.

[0055] The guide tube 38 itself is double-walled and has a helical internal cavity 36. It can also be said that between the two walls of the guide tube 38 a helical intermediate wall is inserted, which allows air to be blown into the area of ​​the mounting flange 32 via an air connection 70 (not shown here), which then travels between the two walls of the guide tube 31 towards the boiler, where it is heated and finally enters the boiler at the mouth of an opening made in the boiler wall 20.

[0056] Between the boiler wall and the guide tube 38 there is a cylindrical gap 37 which is blocked off from the shock wave generator 10 by a perforated plate 35. In the forward position the hollow cylinder 19 is always surrounded by the guide tube 38 and is cooled by the volumetric air flow.

[0057] For this purpose, the guide tube 38 itself is designed with a flange 33, which is firmly connected to the mounting flange 32 of the housing 60' in a receptacle provided by the mounting flange 29. The mounting flange 29 may be provided with one or more passages for a cooling fluid, which can be fed into the flange 33 at this point and via the flange 33 into the guide tube 38.

[0058] In an embodiment not shown, a telescopic extension is provided for retracting the guide tube 38, the retraction mechanism may be pneumatic or hydraulic. By temporarily advancing the guide tube 38 to the position shown in FIG. 13 and then retracting the guide tube 38 after the cleaning pulse, the heating of the guide tube 38 is kept sufficiently low even at the very high flue gas temperatures in the boiler, while the boiler wall 20, which is often porous, is protected from the cleaning pulse. Conversely, the guide tube 38 is at least partially withdrawn from the boiler wall opening 22 during each cleaning pulse, so that substantially only the leading edge 39 of the guide tube 38 is exposed to the gases contained in the boiler, since there is usually no gas exchange with the inside of the guide tube.

[0059] Fig. 15 shows a schematic perspective view of a mounting arrangement for a boiler cleaning device according to another example embodiment with an elastomer 350 in the damping unit. Fig. 16 shows a side view of the boiler cleaning device as shown in Fig. 15. Finally, Fig. 17 shows a partial cross-sectional side view of an assembly of a damping unit made of elastomer 350 with optional guide tubes 353.

[0060] In another advantageous embodiment of the damping units, these consist of a row of annular or tire-shaped elastomers 350, each of which is arranged around one of the second longitudinal or tensioning rods 354 and is supported either directly on the intermediate plate 151 or on a bush 352 (e.g. bush 157) on this intermediate plate 151 facing the immediately adjacent elastomer 350, while the associated second longitudinal rod 354 passes through an opening provided in the intermediate plate 151. In particular, four such elastomers 350 are provided at an angular interval of 90 degrees, so that the four corresponding longitudinal rods 354 are provided with 2 x 7 elastomers 350, respectively. As in the other embodiment, two first tension rods 155 are arranged between each of these four longitudinal rods 354, i.e. between the intermediate plate 151 and the housing of the cleaning device with the damping plate 152. In particular, the elastomer 350 is a copolyester elastomer. Between every other elastomer 350, a spacer 351, in particular a metal plate, may be provided, and the second longitudinal rods 354 may be surrounded by a hollow radial guide tube 353 against which the inner edge of the elastomer 350 abuts, so that the elastomer 350 has practically no play relative to the guide tube 353 and the central axis 355 of the elastomer 350.

[0061] One advantage of using groups of elastomers 350 over a hydraulic arrangement is that damping is sufficient in both directions. The illustration of this example embodiment shows an equal number of elastomers symmetrically positioned on each side of the middle plate 151. It is also possible to use different damping elastomers 350 based on different materials or different dimensions, or to have a different number on each side of the middle plate 151, to achieve asymmetric damping. [Explanation of symbols]

[0062] 10. Shock Wave Generator 11 Retaining Chain 12 Retaining lever 13 Swivel Axis 14 Support frame 15 Molded material for pulleys 16 Pulley 19 Hollow cylinder / discharge tube 20 Boiler wall 22 Boiler wall opening 29 Opening / Mounting Flange 30 Boiler wall flange 31 Boiler connection piece / connection pipe 32 Boiler side mounting flange 33 Guide pipe flange 34 Opening / Mounting Flange 35 Aperture 36 Spiral Internal Slots 37 Cylindrical Gap 38 Guide Tube 39 Leading Edge 40 Installation flange on the cleaning device side 41 Flange connection screw 42 Cover plate 43 Connecting pipe 44 Gasket 50 Damping Cylinder / Sliding Cylinder 51 Piston 60 Closure Housing 60' closure housing 70 Air connection 71 Gas flow direction 80 Closing flap 81 120 degree closure 82 Sliding Cylinder 83 Return spring 84 Hollow support shaft 85 Blowout cooling opening 86 Reinforcing rib 150 Damping spring 151 Intermediate Plate 152 Damping Plate 153 Mounting points 154 Second Tension Rod 155 First Tension Rod 156 Damping spring 157 Sockets 190 Hollow cylinder / discharge tube 250 Fluid Pressure Damper 251 Fluid pressure tappet 252 Fluid pressure damper spring 350 Elastomer 351 Spacer 352 Sockets 353 Guide Tube 354 Second tension rod 355 Center axis

Claims

1. 1. A mounting device for a cleaning device based on introducing high amplitude pressure waves via a hollow cylindrical nozzle (19) into a boiler to be cleaned through an opening in the boiler wall (20), comprising: The mounting device comprises: mounting flanges (30, 32) configured to mount the housing body (10) of the cleaning device to the boiler wall (20); a series of damping units (50; 150, 156; 250; 350) arranged at equal angular intervals around the longitudinal axis of the hollow cylindrical nozzle (19) of the cleaning device, each attached at one free end to the mounting flange (30, 32) and each attached at the other free end to the housing body (10); Including, When the high-amplitude pressure wave is triggered in the cleaning device, the housing body (10) of the cleaning device is elastically held away from the boiler in the longitudinal direction by the series of damping units (50; 150, 156; 250; 350) and returned to a starting position.

2. 2. A mounting arrangement according to claim 1, characterized in that said series of damping units (50; 250) includes hydraulic dampers.

3. An installation device as described in claim 1, characterized in that each damping unit (50) of the series of damping units (50; 250) has a damping cylinder that can be controlled pneumatically or hydraulically and a piston (51) that can be extended from the damping cylinder.

4. Each of the damping units of the series of damping units has two tension / compression springs (150, 156) arranged consecutively in the longitudinal direction; The tension / compression springs (150, 156) are inserted between the mounting flanges (30, 32) and the intermediate plate (151) or between the intermediate plate (151) and the damping plate (152); The housing body (10) is rigidly attached to the intermediate plate (151) by a first longitudinal rod (155); The damping plate (152) is rigidly attached to the mounting flanges (30, 32) by a second longitudinal rod (154); 2. The mounting device according to claim 1, characterized in that an additional hydraulic damper (250) is provided between the damping plate (152) and the intermediate plate (151) longitudinally around the hollow cylindrical nozzle (19).

5. The two tension / compression springs (150, 156) arranged in a line in their longitudinal direction are a spring (157, 352) disposed around one of the second longitudinal rods (154) and supported either directly on the intermediate plate (151) or on a bush (157, 352) on the intermediate plate (151) facing the tension / compression spring (150, 156); 5. Mounting device according to claim 4, characterized in that the associated second longitudinal rod (154) is guided through an opening in the intermediate plate (151).

6. 2. The mounting device according to claim 1, wherein the boiler-side mounting flange (40) is part of a closure housing (60, 60'), the closure housing (60, 60') having a boiler wall flange (30), the boiler wall flange (30) being mountable to the boiler at a longitudinal end opposite the mounting flange (32).

7. 7. The mounting device according to claim 6, characterized in that the closure housing (60, 60') has a guide tube (38) in which the hollow cylindrical nozzle (19) is freely guided.

8. 8. The mounting device according to claim 7, wherein the guide tube (38) is double-walled and has an internal cavity that spirals from a feed point into the guide tube (38) in a direction away from the boiler to a leading edge (39) of the guide tube (38), the internal cavity being capable of being supplied with cooling fluid from a fluid source arranged outside the closure housing (60), and the wall of the guide tube (38) facing the boiler wall or the leading edge (39) has openings for the outlet of the cooling fluid.

9. 9. The mounting device according to claim 8, wherein the guide tube (38) is movable in the longitudinal direction of the hollow cylindrical nozzle (19) relative to the boiler wall flange (30), and the guide tube (38) is at least partially retractable from an opening (22) provided in the boiler wall (20) in a rear standby position.

10. 8. The mounting device according to claim 6 or 7, characterized in that a closure flap (80) including two to four closure wings (81) is provided inside the closure housing (60, 60'), each of the closure wings (81) being pivotable about a support axis (84) arranged in a tangential direction perpendicular to the longitudinal axis, so that when the hollow cylindrical nozzle (19) is advanced past the leading edge of the closure housing (60, 60'), the closure wings are opened by pivoting toward the inner wall of the closure housing (60, 60').

11. 11. The mounting device according to claim 10, wherein the closure vane (81) is double-walled and has an internal cavity, which can be supplied with cooling fluid from a fluid source located outside the closure housing (60, 60'), and the wall of the closure vane (81) facing the boiler wall has openings for the outlet of the cooling fluid.

12. 10. The mounting device according to claim 1, further comprising a pivot shaft (13) arranged above the housing body (10), the pivot shaft (13) being aligned perpendicular to the longitudinal axis of the hollow cylindrical nozzle (19), and the housing body (10) being suspended on the pivot shaft (13) via a pendulum arm (11).

13. 13. The mounting device according to claim 12, characterized in that the pivot shaft (13) is attached to the longitudinally displaceable pulley (16) of the hollow-cylindrical nozzle (19) in a pulley profile provided above the hollow-cylindrical nozzle (19).

14. An installation device as described in claim 1, characterized in that the longitudinal direction of the hollow cylindrical nozzle (19) of the cleaning device is concentric with the opening in the boiler wall (20) and perpendicular to the boiler axis.

15. Each of the damping units has two groups of a plurality of annular elastomers (350) arranged consecutively in their longitudinal direction; The annular elastomer (350) is inserted between the mounting flange (30, 32) and the intermediate plate (151) or between the intermediate plate (151) and the damping plate (152); The housing body (10) is rigidly attached to the intermediate plate (151) by a first longitudinal rod (155); 3. A mounting device according to claim 1 or 2, characterized in that the damping plate (152) is rigidly attached to the mounting flanges (30, 32) by means of a second longitudinal rod (154).

16. Two groups of a plurality of annular elastomers (350) arranged in a row in their longitudinal direction are a second longitudinal rod (154) disposed around one of the second longitudinal rods (154) and supported either directly on the intermediate plate (151) or on a bush (157, 352) on the intermediate plate (151) facing the group of annular elastomers (350); 16. Mounting device according to claim 15, characterized in that the associated second longitudinal rod (154) is guided through an opening in the intermediate plate (151).

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