Removal device

Abstract

To make it possible to efficiently remove a removal object and to make it possible to reliably avoid damage of a reflection member that reflects a laser beam so as to remove the removal object.SOLUTION: In a removal device 25 which removes a removal object 20 present on a metal surface 28 of component parts 27 installed inside plant constitution equipment 26, there are: a laser device 29 provided with a laser emitting part 33 emitting a laser beam L; and a removal auxiliary device 30 provided with a reflection member 35 that reflects the laser beam L emitted by the laser emitting part and irradiates the same to the removal object. The removal auxiliary device is composed by being further provided with a frame 36 including a protection part 43 that covers an outer peripheral part of a reflection surface 38 in the reflection member.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] SUMMARY OF THE INVENTION An embodiment of the present invention relates to a removal device. [Background technology]

[0002] The metal surface of a metal component made of a metallic material may corrode due to interactions between the metallic material and the environment. For example, corrosion reactions such as oxidation occur on the metal surface due to water films, moisture in the environment, oxygen in the air, etc., resulting in the production of corrosion products (rust, etc.). Furthermore, when corrosive components that induce corrosion are present, the adhesion of deposits made of the corrosive components can cause significant corrosion. This can lead to defects such as thinning of the metal component. As a result, as corrosion progresses, the strength and thermal conductivity of the metal component may decrease.

[0003] In order to prevent the occurrence of the above-mentioned problems, it is necessary to perform a removal process on the corrosion products and deposits as the objects to be removed. Various techniques have been proposed for the removal process, such as a removal process using laser light. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2023-42035 [Patent Document 2] Japanese Patent Publication No. 2022-130857 [Patent Document 3] Patent No. 4012536 [Patent Document 4] Patent No. 5574354 [Patent Document 5] Japanese Patent Application Laid-Open No. 2002-22089 Summary of the Invention [Problem to be solved by the invention]

[0005] However, with the above-described conventional techniques, it may be difficult to efficiently perform removal processing when the target of removal processing has a complex shape. For example, in removal processing using laser light, laser light has high coherence and propagates linearly through space. Therefore, the laser light from the laser device cannot be irradiated onto the target of removal that exists on a metal surface other than the metal surface directly facing the laser emission surface from which the laser light is emitted in the laser device. Therefore, it may be difficult to efficiently remove the target of removal using laser light.

[0006] Furthermore, in cases where the laser device is larger than the opening of the equipment containing the object to be removed, it is difficult to efficiently remove the entire object to be removed by a removal process using laser light. In particular, in power plants that generate electricity by recovering heat from combustion gases produced by burning fuel to generate steam and rotate turbines, the above-mentioned problems become apparent when removing the object to be removed that is present on a metal surface that comes into contact with the combustion gas inside plant components such as heat exchangers that make up the power plant.

[0007] To solve this problem, by introducing a reflective member into the object to be removed, it becomes possible to change the propagation direction of light introduced from outside the object to be removed. However, in this case, if light is irradiated to a location other than the center of the reflective surface of the reflective member, the edge of the metal film forming the reflective surface of the reflective member may be chipped or part of the metal film may peel off, causing damage to the reflective member.

[0008] The embodiments of the present invention have been made in consideration of the above-mentioned circumstances, and have an object to provide a removal device that can efficiently remove objects to be removed and can reliably avoid damage to a reflective member that reflects laser light to remove the objects to be removed. [Means for solving the problem]

[0009] A removal device in an embodiment of the present invention is a removal device that removes a removal target that is present on the surface of a component installed inside an equipment, and includes a laser device having a laser emission unit that emits laser light, and a removal auxiliary device having a reflecting member that reflects the laser light emitted from the laser emission unit and irradiates the removal target, and is characterized in that the removal auxiliary device is further configured with a protective member that covers the outer periphery of the reflecting surface of the reflecting member. [Effects of the Invention]

[0010] According to the embodiment of the present invention, it is possible to efficiently remove the object to be removed, and also to reliably avoid damage to the reflecting member that reflects the laser light to remove the object to be removed. [Brief explanation of the drawings]

[0011] [Figure 1] 1 is a system diagram showing a power plant having a heat recovery boiler as a plant component to which a removal device according to a first embodiment is applied to remove removal targets. [Figure 2] 2A and 2B show the heat transfer tubes and heat exchange fins of the heat exchanger as components in the heat recovery boiler of FIG. 1, where FIG. 2A is a front view and FIG. 2B is a cross-sectional view taken along line IIB-IIB of FIG. 2A. [Figure 3] FIG. 1 is a configuration diagram showing a removal device according to a first embodiment. [Figure 4] FIG. 4 is a front view showing the removal assist device of FIG. 3. [Figure 5] 5 is a cross-sectional view taken along line VV in FIG. 4. [Figure 6] FIG. 6 is a perspective view showing the reflecting member of FIGS. 4 and 5. [Figure 7] 4(A), (B) and (C) are process diagrams showing the removal process performed using the removal device of FIG. 3. [Figure 8] FIG. 10 is a front view showing a removal auxiliary device of a removal device according to a second embodiment. [Figure 9] 9(A) and 9(B) show a removal assisting device of a removal device according to a third embodiment, in which (A) is a front view and (B) is a view taken along the arrow IXB in FIG. 9(A). [Figure 10]FIG. 10 is a side view showing a removal auxiliary device of a removal device according to a fourth embodiment. [Figure 11] 11A and 11B show a removal assisting device of a removal device according to a fifth embodiment, in which (A) is a front view and (B) is a view taken along the arrow XIB in FIG. [Figure 12] FIG. 10 is a perspective view of a reflecting member showing a state in which a defect has occurred on the edge of the reflecting surface of the reflecting member. [Figure 13] FIG. 10 is a perspective view of a reflecting member showing a state in which peeling has occurred in part of the reflecting surface of the reflecting member. DETAILED DESCRIPTION OF THE INVENTION

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. [A] First embodiment (Figs. 1 to 6) FIG. 1 is a system diagram showing a power plant having a heat recovery boiler as a plant component to which a removal device according to a first embodiment is applied to remove removal targets. The power plant 1 is a thermal power plant that generates electricity using combustion gas G generated by burning fuel (e.g., fossil fuels such as natural gas, oil, and coal). Specifically, the power plant 1 is, for example, a combined cycle power generation type thermal power plant, in which internal combustion power generation is performed using a gas turbine 2 as an internal combustion engine, and power is also generated using the exhaust heat thereof. Note that the power plant 1 may be of a type other than a combined cycle power generation type.

[0013] In the above-described power plant 1, internal combustion power is generated by transmitting the rotational force of the gas turbine 2 to the first generator 3. The combustion gas G discharged from the gas turbine 2 is sent to the heat recovery boiler 5 via an exhaust duct 4. In the heat recovery boiler 5, a heat exchanger 6 installed therein exchanges heat between water W and the combustion gas G. As a result, the water W evaporates in the heat recovery boiler 5 to become steam S. The combustion gas G that has passed through the heat recovery boiler 5 is sent to a chimney 8 via the exhaust duct 4 and is discharged from the chimney 8 into the atmosphere.

[0014] The steam S evaporated in the heat exchanger 6 of the heat recovery boiler 5 is introduced into the steam turbine 10 via the water circulation line 9. As a result, the rotational force of the steam turbine 10 is transmitted to the second generator 11, generating electricity. The steam that has passed through the steam turbine 10 is sent to the condenser 12, where it is condensed and returned to water W (condensed water). The water W condensed in the condenser 12 is returned again to the heat recovery boiler 5 via the water circulation line 9.

[0015] The heat exchanger 6 of the heat recovery boiler 5 is configured to have a high-temperature section 6A, a medium-temperature section 6B, and a low-temperature section 6C. As shown in FIGS. 2(A) and 2(B), the heat exchanger 6 is equipped with a plurality of heat transfer tubes 13. In FIG. 2(A), the axial direction (longitudinal direction) of the heat transfer tubes 13 is shown along the plane of the paper, while in FIG. 2(B), the axial direction of the heat transfer tubes 13 is shown perpendicular to the plane of the paper. Water W flowing through the water circulation line 9 passes through the heat transfer tubes 13. At this time, heat exchange occurs between the water W flowing inside the heat transfer tubes 13 and the combustion gas G flowing around the heat transfer tubes 13, and as a result, the water W flowing inside the heat transfer tubes 13 evaporates to become steam S.

[0016] Heat exchange fins 14 are provided on the outer peripheral surface of the heat transfer tube 13 to improve the efficiency of heat exchange. For example, the heat exchange fins 14 are wound around the outer peripheral surface of the heat transfer tube 13 and extend in a spiral shape. Alternatively, multiple heat exchange fins 14 may be provided on the outer peripheral surface of the heat transfer tube 13 so as to be aligned along the axial direction of the heat transfer tube 13. Both the gap 15 between the pair of heat transfer tubes 13 and the gap 16 between the pair of heat exchange fins 14 are narrow portions.

[0017] The heat transfer tubes 13 and the heat exchange fins 14 are made of a metal material (e.g., carbon steel) containing iron as a main component. As described above, the heat transfer tubes 13 and the heat exchange fins 14 include metal surfaces that come into contact with the combustion gas G. Although not shown in FIGS. 2(A) and 2(B), corrosion occurs on the metal surfaces due to long-term use and the adhesion of substances contained in the combustion gas G. This can result in corrosion products and deposits adhering to the metal surfaces, which can reduce the heat conduction performance.

[0018] Next, as shown in Fig. 3, a removal device 25 will be described that performs a removal process on corrosion products and deposits generated in a power plant 1 that generates power using combustion gas G produced by the combustion of fuel, as removal targets 20. This removal device 25 removes removal targets 20 that are present on metal surfaces 28 that come into contact with combustion gas G of components 27 installed inside plant component equipment 26 that constitutes the power plant 1, and is configured with a laser device 29 and a removal auxiliary device 30. Here, the plant component equipment 26 is, for example, the heat recovery steam generator 5 (Fig. 1) of the power plant 1, and the component 27 is, for example, a heat transfer tube 13 (Fig. 2) that constitutes the heat exchanger 6 of the heat recovery steam generator 5.

[0019] 3, the laser device 29 is configured to include a laser oscillator 31, a waveguide device 32, and a laser emission unit 33, and generates and emits laser light L having energy sufficient to vaporize the object to be removed 20. This laser light L may be either a pulsed wave or a continuous wave.

[0020] The laser oscillator 31 is a light source of the laser light L. The waveguide device 32 includes, for example, an optical fiber, and guides the laser light L generated by the laser oscillator 31 to the laser emitting unit 33. The laser emitting unit 33 has an emitting surface 33A, and emits the laser light L generated by the laser oscillator 31 and guided through the waveguide device 32 from the emitting surface 33A to the outside of the laser apparatus 29.

[0021] 4 and 5, the removal assist device 30 is configured to include a reflecting member 35 that reflects the laser light L emitted from the laser emission unit 33 of the laser device 29 and irradiates the laser light L onto the removal target 20, a frame 36 that supports the reflecting member 35, and a connecting member 37 that connects the frames 36 when a plurality of frames 36 are provided. Although one reflecting member 35 may be arranged on one frame 36, in the first embodiment, a plurality of (for example, four) reflecting members 35 are arranged side by side in a rectangular shape on one frame 36.

[0022] The removal assist device 30 is carried into the plant constituent equipment 26 through an opening 26A (FIG. 3) of the plant constituent equipment 26, whether the plant constituent equipment 26 has one frame 36 or multiple frames 36. At this time, the removal assist device 30 is carried into and installed in the plant constituent equipment 26 using a rod-shaped insertion tool or carrying tool (not shown). The removal assist device 30 is also installed inside the plant constituent equipment 26 at an angle and position such that the object to be removed 20 is removed from the metal surface 28 by irradiating the object to be removed 20 with laser light L reflected by the reflecting member 35.

[0023] As a result, the reflecting member 35 of the removal auxiliary device 30 reflects the laser light L emitted from the laser emission section 33 of the laser device 29 and incident on the plant component equipment 26 through the opening 26A of the plant component equipment 26, changes the direction of travel of the laser light L, and irradiates it onto the object to be removed 20 present on the metal surface 28 of the component part 27, thereby vaporizing and removing this object to be removed 20.

[0024] 4 and 5 , when a plurality of frames 36 are provided, these frames 36 can be set at any angle by hinges 37A of connecting members 37, thereby making it possible to change the angle θ of the mutual arrangement of the plurality of reflecting members 35 provided on each of the frames 36. Therefore, the laser light L emitted from the laser emission unit 33 of the laser device 29 and passed through the opening 26A of the plant constituent equipment 26 is reflected multiple times by the reflecting members 35 of the plurality of frames 36 of the removal auxiliary device 30, changing its traveling direction and adjusting the irradiation position on the removal target 20. As a result, it becomes possible to remove the removal target 20 with the laser light L even if the removal target 20 is located in a place where it would be difficult to irradiate with the laser light L if the laser light L were not reflected by the reflecting members 35 of the plurality of frames 36 of the removal auxiliary device 30.

[0025] In addition, the multiple frames 36 can be set at any angle using the hinges 37A of the connecting members 37, so that they are in a folded state or in a 180-degree expanded state, and in this state the removal assistance device 30 is carried into the interior of the plant component equipment 26 through the opening 26A of the plant component equipment 26 and installed.

[0026] Next, a removal process for removing the removal target 20 present on the metal surface 28 of the component part 27 of the plant component device 26 using the removal device 25 configured as described above will be described with reference to FIGS. 3 and 7.

[0027] First, the removal auxiliary device 30 is installed inside the plant constituent equipment 26. Here, as shown in FIG. 3 , the removal auxiliary device 30 is installed when removing the object to be removed 20 that is located on the metal surface 28 of the component 27 at a position other than the position facing the emission surface 33A of the laser emission unit 33 of the laser device 29. To install the removal auxiliary device 30, for example, the worker who will perform the removal process checks the state inside the plant constituent equipment 26 and carries in the removal auxiliary device 30 using an insertion tool or the like. Alternatively, if necessary, the laser emission unit 33 of the laser device 29 and the removal auxiliary device 30 are connected together using a rod- or plate-shaped connecting member, and the removal auxiliary device 30 is installed inside the plant constituent equipment 26.

[0028] Thereafter, laser light L is emitted from laser emission unit 33 of laser device 29, and the laser light L reflected by removal assist device 30 is irradiated onto object to be removed 20 present on metal surface 28 of component 27. This removes object to be removed 20. FIGS. 7(A) to (C) show a case where object to be removed 20 is present on metal surface 28 of component 27 (for example, heat transfer tube 13 of heat exchanger 6 shown in FIG. 2(A)), and FIGS. 7(A) to (C) sequentially show steps of removal process of object to be removed 20 by removal device 25.

[0029] As shown in FIG. 7(A), a removal target 20 exists on a metal surface 28 of a component 27. This removal target 20 is a corrosion product 18 and an attachment 19. The corrosion product 18 is a substance produced when the material of the component 27 (e.g., carbon steel) is corroded by the combustion gas G. The attachment 19 is a substance to which components contained in the combustion gas G have attached, and includes, for example, substances such as ammonium sulfate.

[0030] As shown in Fig. 7(B), laser light L is irradiated onto removal target 20 by removal device 25. That is, in removal device 25, laser light L emitted from laser device 29 is reflected by removal auxiliary device 30 and then irradiated onto removal target 20. As a result, as shown in Fig. 7(C), removal target 20 is decomposed into decomposition products 21 such as corrosion products and corrosion components evaporated by laser light L and trace amounts of rust scattered by the impact of laser light L, and is then removed.

[0031] This decomposition and removal is carried out by the laser ablation effect, which is an interaction between light and matter. To obtain a sufficient laser ablation effect, factors such as the absorption characteristics of the laser light L of the compounds constituting the removal target 20, the density of the removal target 20, the thickness of the removal target 20, the laser oscillation wavelength of the laser light L, and the laser power density of the laser light L are taken into consideration.

[0032] By irradiating the removal target 20 with laser light L having a certain energy density (laser power density) or higher, the removal target 20 absorbs the light energy of the laser light L and is instantaneously heated. As a result, the removal target 20 is converted into plasma, which sublimates and is removed as decomposition products 21. Note that although the plasmatized substance may recombine to produce re-products, the particle size is so small that it is unlikely to cause a decrease in the functionality of the component 27 and is unlikely to produce visible dust.

[0033] Furthermore, the metal surface 28 of the component 27 from which the removal target 20 has been removed is covered with a coating layer, for example, by applying paint. In this case, the removal target 20 is not interposed between the metal surface 28 and the coating layer, so the coating layer is prevented from peeling off from the metal surface 28. The coating may be performed after the metal surface 28 of the component 27 has been roughened.

[0034] 4 and 5, the frame 36 that supports the reflecting member 35 also functions as a protective member that covers the outer periphery of the reflecting surface 38 of the reflecting member 35. That is, as shown in Fig. 6, the reflecting member 35 has the reflecting surface 38 formed by a metal film 40 that is formed by vapor-depositing a metal such as silver on one surface of a substrate 39, and the laser light L is reflected by this reflecting surface 38.

[0035] However, as shown in Fig. 12, there are portions on the edge of the metal film 40 where defects 40A are likely to occur due to irradiation with laser light L, and as shown in Fig. 13, there are cases where a boundary 42 between the substrate 39 and the metal film 40 is exposed, and irradiation of this boundary 42 with laser light L can cause peeling 40B in the metal film 40. As shown in Figs. 4 and 5, the frame 36 has a protective portion 43 formed on its inner periphery, and this protective portion 43 covers the outer periphery of the reflecting surface 38 of the reflecting member 35, thereby preventing the laser light L from irradiating the outer periphery of the reflecting surface 38 and protecting the reflecting surface 38.

[0036] As configured as above, the first embodiment provides the following effects (1) and (2). (1) As shown in Fig. 3, the reflecting member 35 of the removal auxiliary device 30 reflects the laser light L emitted from the laser emission unit 33 of the laser device 29 and irradiates the object to be removed 20. Therefore, even if the object to be removed 20 is present at a position other than the position facing the laser emission unit 33 on the metal surface 28 of a component 27 installed inside the plant component equipment 26, the laser light L can be irradiated onto the object to be removed 20. As a result, the object to be removed 20 present on the metal surface 28 of the component 27 can be efficiently removed by the laser light L.

[0037] (2) As shown in Figures 4 to 6, in the reflective member 35 of the removal assist device 30, a reflective surface 38 is formed by a metal film 40 formed by vapor-depositing a metal on one surface of a substrate 39, and this reflective surface 38 reflects the laser light L. The outer periphery of this reflective surface 38 is covered by a protective portion 43 of the frame 36, protecting the reflective surface 38. This prevents edge chipping 40A and partial peeling 40B on the reflective surface 38 of the reflective member 35, and as a result, damage to the reflective member 35 can be reliably avoided.

[0038] [B] Second embodiment (Fig. 8) 8 is a front view showing a removal assist device of a removal device according to a second embodiment. In this second embodiment, parts similar to those in the first embodiment are given the same reference numerals as in the first embodiment, and descriptions thereof will be simplified or omitted.

[0039] The removal assist device 46 in the removal device 45 of the second embodiment differs from the first embodiment in that a plurality of frames 47 each support one reflective member 35 and are arranged in a rectangular position, and the plurality of frames 47 are connected in a bendable manner using elastic bodies 48 made of an elastic material such as rubber or resin, thereby making it possible to change the arrangement angle θ of the reflective members 35 supported by each frame 47. Furthermore, a protective portion 49 formed on the outer periphery of each frame 47 covers the outer periphery of the reflective surface 38 of the reflective member 35, thereby protecting the reflective surface 38 of the reflective member 35 from the laser light L.

[0040] As configured as above, the second embodiment also provides the same advantages as the advantages (1) and (2) of the first embodiment.

[0041] [C] Third embodiment (Fig. 9) 9A and 9B show a removal assisting device of a removal device according to a third embodiment, in which (A) is a front view and (B) is a view taken along the arrow IXB in Fig. 9A. In this third embodiment, parts similar to those in the first embodiment are given the same reference numerals as in the first embodiment, and the description thereof will be simplified or omitted.

[0042] The removal assisting device 51 in the removal device 50 of the third embodiment differs from that of the first embodiment in that the removal assisting device 51 is configured to include a support plate 52 as a support member that supports the reflecting member 35, and an elastic member 53 that secures and protects the reflecting member 35 to the support plate 52. The elastic member 53 is made of an elastic material such as resin or rubber, and is adhered to the outer periphery of the reflecting surface 38 of the reflecting member 35 to protect the outer periphery of the reflecting surface 38 from the laser light L.

[0043] As configured as above, the third embodiment also provides the same advantages as the advantages (1) and (2) of the first embodiment.

[0044] [D] Fourth embodiment (Fig. 10) 10 is a side view showing a removal assist device of a removal device according to a fourth embodiment. In this fourth embodiment, parts similar to those in the first embodiment are given the same reference numerals as in the first embodiment, and descriptions thereof will be simplified or omitted.

[0045] The removal assisting device 61 in the removal device 60 of this fourth embodiment differs from the first embodiment in that the removal assisting device 61 is configured to include a support plate 62 as a support member for supporting the reflective member 35, and an elastic member 63 that secures and protects the reflective member 35 to the support plate 62 and also connects multiple support plates 62.

[0046] The elastic member 63 is made of an elastic material such as resin or rubber, and is adhered to the outer periphery of the reflecting surface 38 of the reflecting member 35 to protect the outer periphery of the reflecting surface 38 from the laser light L. Furthermore, by connecting the multiple support plates 62 with the elastic member 63, these support plates 62 are connected in a bendable manner, and the arrangement angle θ of the reflecting members 35 supported by each support plate 62 is configured to be changeable. By changing the arrangement angle θ of the reflecting member 35, the irradiation position of the laser light L reflected by the reflecting surface 38 of the reflecting member 35 is adjusted.

[0047] As configured as above, the fourth embodiment also provides the same advantages as the advantages (1) and (2) of the first embodiment.

[0048] [E] Fifth embodiment (Fig. 11) 11 shows a removal assist device of a removal device according to a fifth embodiment, where (A) is a front view and (B) is a view taken along the arrow XIB in FIG. 11(A). In this fifth embodiment, parts similar to those in the first embodiment are designated by the same reference numerals as in the first embodiment, and the description thereof will be simplified or omitted.

[0049] The removal auxiliary device 71 in the removal device 70 of the fifth embodiment differs from that of the first embodiment in that the removal auxiliary device 71 is configured to include a support plate 72 as a support member that supports the reflecting member 35, and a protective member 73 that is fixed to the outer periphery of the reflecting surface 38 of the reflecting member 35 and protects the outer periphery of the reflecting surface 38 from the laser light L. The protective member 73 is configured of a thin film of resin or the like.

[0050] As configured as above, the fifth embodiment also provides the same advantages as the advantages (1) and (2) of the first embodiment.

[0051] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, changes, and combinations can be made without departing from the spirit of the invention. Furthermore, such substitutions, changes, and combinations are included in the scope and spirit of the invention, and are also included in the inventions and their equivalents as set forth in the claims. [Explanation of symbols]

[0052] 1...power plant, 5...waste heat recovery boiler (plant component), 6...heat exchanger (component), 13...heat transfer tube (component), 20...object to be removed, 25...removal device, 26...plant component, 27...component, 28...metal surface, 29...laser device, 30...removal auxiliary device, 33...laser emission part, 35...reflecting member, 36...frame (protective member), 37...connecting member, 38...reflecting surface, 43...protective part, 45...removal device, 46...removal auxiliary device, 47...frame (protective member), 48...elastic body, 49...protective part, 50...removal device, 51...removal auxiliary device, 52...support plate (support member), 53...elastic member, 60...removal device, 61...removal auxiliary device, 62...support plate (support member), 63...elastic member, 70...removal device, 71...removal auxiliary device, 72...support plate (support member), 73...protective member, G...combustion gas, L...laser light, θ...arrangement angle.

Claims

1. A removal device for removing a target substance present on the surface of a component installed inside a device, a laser device including a laser emission unit that emits laser light; a removal auxiliary device including a reflecting member that reflects the laser light emitted from the laser emission unit and irradiates the laser light onto the object to be removed, The removal assisting device is characterized in that it is further provided with a protection member that covers an outer periphery of the reflecting surface of the reflecting member.

2. The removal device according to claim 1, characterized in that the removal assistance device is provided with a plurality of reflecting members whose relative angles can be changed, and the laser light is reflected by each of the plurality of reflecting members so that the irradiation position on the object to be removed can be adjusted.

3. the removal assisting device includes a frame that supports a reflecting member and also functions as a protective member, and a plurality of the frames and the reflecting members are provided; The removal device according to claim 1, characterized in that the multiple frames are connected by connecting members so that the mutual arrangement angles of the multiple reflecting members can be changed, and the laser light is reflected by each of the multiple reflecting members so that the irradiation position on the object to be removed can be adjusted.

4. 2. The removal device according to claim 1, wherein the protective member of the removal assisting device is made of an elastic material or a thin film.

5. 2. The removal device according to claim 1, wherein the removal assistance device is configured to include a support member for supporting the reflective member, and an elastic member that fixes the reflective member to the support member and also functions as a protective member.

6. the removal assisting device includes a support member for supporting a reflecting member, and an elastic member that fixes the reflecting member to the support member and also functions as a protective member, and a plurality of the support members and the elastic members are provided; The removal device according to claim 1, characterized in that the support member is connected by the elastic member so that the mutual arrangement angle of the plurality of reflecting members can be changed, and the laser light is reflected by each of the plurality of reflecting members so that the irradiation position on the object to be removed can be adjusted.

7. the equipment is a heat recovery boiler as a plant component of a power plant that generates power using combustion gas generated by burning fuel, 7. The removal device according to claim 1, wherein the component is a component that constitutes a heat exchanger installed inside the heat recovery boiler.

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