TW202138714A - Boiler internal inspection method - Google Patents

Abstract

This boiler internal inspection method includes: a step for placing, in a furnace of a boiler, an inspection unit for inspecting the inside of the boiler; a step for moving the inspection unit while visually observing same through an ash discharge port formed at the the lower end of a water-cooled wall of the furnace; and a step for inspecting the inside of the boiler by means of the inspection unit.

Description

Boiler internal inspection method

The present invention relates to an internal inspection method of a boiler.

In order to increase the operating time of the boiler, it is necessary to shorten the period of regular inspections. In addition, there is also a need to extend the interval of periodic inspections. At this time, it is also necessary to review simple inspections during the period of periodic inspections when the boiler is stopped to ensure the frequency of inspections. Therefore, for example, Patent Document 1 discloses a method of inserting a flying body into the boiler from an opening formed in the side wall of the furnace of the boiler, and obtaining data for maintenance inspection points of the boiler. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] JP 2018-136078 A

[The problem to be solved by the invention]

When maneuvering while viewing the flying object through an opening formed in the side wall of the furnace of the boiler, the range of the internal space of the boiler furnace that can be seen from the opening is limited, and it is not easy to look at the flying object sideways. The position is moved to check the situation. In addition, when maneuvering from the outside of the boiler based on the image taken by the flying body, the accumulation of ash and the like in the furnace of the boiler will still be rolled up by the wind pressure from the flying body, which may make the manipulation difficult.

It is also considered to set up a scaffold in the furnace of the boiler so that the operator can enter it while looking at the flying object while manipulating it. However, since it takes time to install the scaffold, and if the inside of the boiler's furnace is not sufficiently cooled, the operator cannot enter it. Therefore, it may be difficult to perform early inspection after the boiler is stopped.

However, the viewing angle of an average person is said to be ±60° in the vertical direction and ±100° in the horizontal direction when facing the front. However, the effective field of view is ±20° in the vertical direction and horizontal The direction is ±30°. When the operator on a scaffold of a certain height installed in the furnace of the boiler inspects from the lower end to the upper end of the boiler, in order to grasp the position in the boiler furnace of the inspection unit while ensuring the safety of the inspector himself To operate the inspection unit, it is necessary to operate while moving the line of sight up, down, left, and right, which may cause errors in operation.

In view of the above-mentioned situation, the object of the present invention is to provide a method for inspecting the inside of a boiler, which can perform an early, safe and easy inspection of the inside of a boiler. [Technical means to solve the problem]

In order to achieve the above-mentioned object, the boiler interior inspection method of the present invention includes: a step of putting an inspection unit for inspecting the interior of the boiler into the inside of the furnace of the boiler; The step of moving the inspection unit while viewing the inspection unit visually at the outlet; and the step of inspecting the interior of the boiler by the inspection unit. [Effects of the invention]

According to the present invention, it is possible to provide a method for inspecting the inside of a boiler that can be performed early, safely and easily.

Hereinafter, some embodiments of the present invention will be described with reference to the attached drawings. However, the description in the embodiment or the size, material, shape, relative arrangement, etc. of the component parts shown in the drawings are for illustration only, and not for limiting the scope of the invention. For example, "a certain direction", "along a certain direction", "parallel", "perpendicular cross", "center", "concentric" or "coaxial" and other relative or absolute configuration performance, not just strictly displayed Such a configuration also includes the range of relative displacement under the condition of tolerances or angles and distances to the extent that the same function can be obtained. For example, things such as "identity", "equivalence", and "homogeneity" are representations of the equivalent state, not only strictly displaying the equivalent state, but also including tolerances, or the range of differences in the degree to which the same function can be obtained. For example, the expression of shapes such as quadrangular shapes and cylindrical shapes is not limited to shapes such as quadrangular shapes and cylindrical shapes in the strict geometric sense, but also includes unevenness and inverted portions within the range where the same effect can be obtained. The shape of the corner (tapered surface) portion, etc. On the other hand, the expression of "have", "have", or "include" a single component element does not mean exclusively to exclude the existence of other components.

In the following embodiment, for example, an example of a case where the inside of the boiler 4 is inspected in the boiler device 2 which is a relatively large structure used in a thermal power plant or the like.

Fig. 1 is a schematic diagram showing a schematic configuration of a boiler device 2 (2A) according to an embodiment. Fig. 2 is a schematic diagram showing enlarged the schematic cross section of the lower part of the boiler device 2 (2A) shown in Fig. 1. Fig. 3 is a schematic diagram showing a schematic cross-section of the boiler device 2 (2A) shown in Fig. 1. Fig. 4 is a horizontal cross-sectional view of the water wall 14 shown in Figs. 1 to 3.

As shown in FIGS. 1 and 2, the boiler device 2 (2A) includes an ash treatment device 6 (6A) provided below the boiler 4 and the boiler 4. And, as shown in Fig. 3, the boiler 4 is a heat exchanger group including a furnace 8 and a plurality of heat exchangers 54 and 56 for generating steam.

As shown in Fig. 1 or Fig. 2, the furnace 8 is constituted by a hollow structure forming an internal space 10 including a combustion chamber for burning fuel. The air is supplied to the inside of the stove 8 from a press-in fan 40 provided outside the stove 8 through an air preheater not shown. In addition, the combustion gas generated by the combustion of fuel by the furnace 8 is guided to the downstream side of the furnace 8 by the attracting fan 42 provided on the downstream side of the furnace 8. In this way, the press-in fan 40 and the attracting fan 42 function as a ventilation fan that removes heat when the boiler is stopped by moving the fluid in the furnace 8 toward the downstream side of the furnace 8 respectively.

The internal space 10 and the external space 12 of the stove 8 are separated by a cylindrical water wall 14. The water wall 14 is composed of a plurality of water pipes 18 joined to each other by fins 16 as shown in FIG. 4. The water pipe 18 is a hollow tubular member made of steel, for example, and a fluid medium such as cooling water or steam flows inside the water pipe 18.

As shown in Figure 1 or Figure 2, the water wall 14 is installed in the height direction from the top 20 of the furnace 8 to the position of the bottom inlet 22 of the boiler. The water pipe 18 of the water wall 14 is connected to the bottom inlet 22 of the boiler. connect. In Figures 1 and 2, the position of the lower end 14a of the water wall 14 is shown by a dotted line. The cylindrical transition slot 15 is connected to the lower end 14a of the water wall 14. The ash generated by burning the fuel inside the furnace 8 passes through sequentially: the ash discharge port 19 (the discharge port for discharging ash from the furnace 8) formed at the lower end 14a of the water wall 14 and the transition slot The inside of 15 falls to the ash processing device 6.

The ash treatment device 6 (6A) is located below the ash discharge port 19 and includes: a water tank 24 that can store water, and ash falling from the internal space 10 of the furnace 8 toward the water tank 24 (the ash treatment device 6 The inner ash) is a belt conveyor 26 for conveying to the outside of the water tank 24. By immersing the lower end 15a of the transition slot 15 in the water stored in the water tank 24, the internal space 10 of the furnace 8 is water-sealed. Thereby, the internal space 10 and the external space 12 of the furnace 8 pass through the internal space of the transition slot 15 and become a disconnected state.

As shown in FIG. 3, the flue 13 is connected vertically above the furnace 8. The not-shown burner generates combustion gas by injecting a mixture of fuel and combustion air in the furnace 8 to form a flame. The generated combustion gas is in the process of flowing in the flue 13, and the combustion gas heats or superheats the feed water and steam flowing on the water wall 14 and the heat exchangers 54, 56 to generate superheated steam. By supplying the generated superheated steam to rotationally drive a steam turbine not shown, it is possible to rotationally drive a generator not shown connected to the rotating shaft of the steam turbine to generate electricity.

Next, some inspection methods for inspecting the inside of such a boiler 4 will be described. In addition, in the following description, the symbols that are common to the aforementioned structure, unless otherwise noted, show the same structure as the aforementioned structure, and redundant description is omitted. In addition, the inspection of the inside of the boiler 4 may be an inspection of the water wall 14 of the furnace 8 or an inspection of a heat exchanger provided inside the boiler 4.

In some embodiments, as shown in FIG. 5, an inspection unit 32 (32A) including a UAV 30 (Unmanned Aerial Vehicle) equipped with a camera 28 as an imaging device is used to inspect the inside of the boiler 4. In this case, the inspection unit 32 is equipped with a communication unit (not shown) capable of communicating with the outside, and can be operated remotely according to the operation signal received from the outside. In addition, the inspection operator 100 operates the UAV 30 remotely through the controller 34 that can communicate with the UAV 30, and introduces the inspection unit 32 into the furnace 8 through the ash discharge port 19, while visually inspecting the inspection unit 32 through the ash discharge port 19 , While moving the inspection unit 32 toward the place to be inspected. In addition, the “visual inspection unit through the ash discharge port 19”, in other words, is a visual inspection unit through the ash discharge port 19 from the lower outside of the furnace 8, in other words, the visual inspection unit 32 through the ash discharge port 19.

Also, in the embodiment shown in FIG. 5, the inspection operator 100 first discharges the water in the water tank 24 of the ash treatment device 6 from the water tank 24, and enters the ash treatment device 6 from an inlet and outlet not shown in the figure. . In addition, the inspection operator 100 is standing on the belt conveyor 26, visually inspecting the inspection unit 32 through the ash discharge port 19 from the inside of the ash processing apparatus 6, while using the controller 34 to remotely operate the inspection unit 32 move.

In this way, the inspection operator 100 moves the inspection unit 32 inside the furnace 8 and moves the inspection unit 32 by remote operation while visually viewing the inspection unit 32 through the ash discharge port 19 from the outside of the furnace 8. Therefore, there is no need to install a scaffold inside the furnace 8, the work time can be shortened, and the stop time of the boiler 4 can be shortened. In addition, since the waiting time required for the cooling of the furnace 8 can be shortened, the inspection work can be started early, and the stop time of the inspection boiler 4 can be shortened. In addition, since the inspection work can be started early, the detailed inspection points can be found early, and early preparation for the subsequent process is possible, so the shutdown time of the boiler 4 can be shortened. In this way, the inside of the boiler 4 can be inspected early.

Furthermore, since a large number of water pipes are arranged in the boiler 4, it is difficult to grasp the position of the inspection unit if there is only an image of the inspection unit in the prior art. Especially, it is more difficult in the environment full of dust and wind pressure in the boiler 4. In addition, if the interval between the heat exchangers is narrow, the UAV will collide with the heat exchanger, and the image of the UAV will be unstable and the inspection will be difficult. In addition, in order to obtain a stable camera image from the inspection unit, there are cases in which the protective device is moved along the inner wall of the furnace. Manipulation errors caused by delays. Moreover, because the above-mentioned portrait is generally a flat portrait, it is not easy to grasp the appearance in the depth direction.

Regarding this, according to the above-mentioned boiler internal inspection method, by arranging the operator outside (lower side) of the furnace 8, the boiler 4 is less susceptible to dust and temperature after the stop, and the inspection can be carried out early and safely. . In addition, since the inspection operator 100 can safely manipulate the inspection unit 32 from a safe position, the inspection operator 100 can focus on the position and manipulation of the inspection unit 32.

As shown in Fig. 6A, the bottom 8a of the stove 8 is a mortar-shaped part whose cross-sectional area becomes smaller as it goes downward. Through the ash discharge port 19 at the bottom, the stove can be visually confirmed within the effective field of view. The whole within 8. Therefore, as shown in FIG. 6B, since the vertical direction is the entire interior of the furnace 8 in the longitudinal direction can be visually confirmed from the form of looking up, it is not necessary to move the sight line up and down during the operation, and the operation is easy. FIG. 6B shows a state where the water wall 14 and the heat exchangers 54 and 56 inside the boiler 4 are photographed through the ash discharge port 19.

In the upper part of the furnace 8, a heat exchanger group (for example, the heat exchangers 54 and 56 shown in Fig. 3 and Fig. 6 B) in which the heat transfer tubes are hung down in a panel shape is provided. Since the inspection unit 32 is moved in the gap of the heat exchanger group, as shown in FIG. 7, when visually confirming from the lower side of the furnace 8, the panels are effective without overlapping. Furthermore, since the inside of the stove 8 is usually dark, lighting is performed from the lower part during inspection. Therefore, from the lower part of the furnace 8, it is possible to visually confirm in a state where the illumination is sufficiently in contact with both the inspection unit 32 and the inspection target.

And compared with the situation in which a scaffold is installed inside the furnace 8 to inspect the interior of the boiler 4 from the scaffold, because the inspection unit 32 can be moved by remote operation without a scaffold inside the furnace 8. The internal inspection of the boiler 4 can shorten the inspection period and reduce the inspection cost, and the safety of the inspection operation can be improved.

And by putting the inspection unit 32 into the furnace 8 through the ash discharge port 19, there are no obstacles in the furnace 8 from the lower part to the upper part of the furnace 8, so the inside of the boiler 4 can be inspected by an easy operation.

In addition, before the inspection unit 32 is put into the furnace 8 by a remote operation, the operation of the press-in fan 40 (refer to Fig. 1) and the operation of the attracting fan 42 (refer to Fig. 1) are separately stopped. As a result, since the inspection unit 32 can be flown inside the furnace 8 with the operation of the press-in fan 40 and the attracting fan 42 stopped, it will not receive the furnace 8 caused by the operation of the press-in fan 40 and the attracting fan 42. Due to the influence of the turbulence of the internal airflow, the inspection unit 32 can be easily moved by remote operation. Moreover, by releasing the water seal at the bottom 8a of the stove 8, a natural slight air flow can rise through the ash discharge port 19 inside the stove 8, passing through the superheater and exhaust gas treatment device not shown, and finally through the chimney The effect is exhausted from a chimney not shown. In particular, the bottom 8a of the stove 8 includes a mortar-shaped part whose cross-sectional area decreases as it goes downward, and the ash discharge port 19 has a narrow shape. Therefore, the above-mentioned slight constant (steady) air flow is likely to occur, and the inspection unit 32 can be moved toward the upper part of the furnace 8 along the air flow. Therefore, the inspection path is such that after the inspection unit 32 is raised to the uppermost part of the furnace 8, by moving from the upper part to the lower part of the furnace 8, it becomes a flight where power consumption can be suppressed.

In the illustrated embodiment shown in FIG. 5, the inspection operator 100 moves the inspection unit 32 by remotely operating the UAV 30 while standing on the belt conveyor 26 of the ash processing device 6, but as in the eighth As shown in the figure, after the inspection operator 100 removes the ash processing device 6, he can also move the inspection unit 32 by remote operation while visually viewing the inspection unit 32 from the empty space 36 after the ash processing device 6 is removed. .

In the embodiment shown in Fig. 8, the ash processing device 6 shown in Figs. 1 and 2 is disassembled and removed from below the furnace 8 (under the ash discharge port 19). In addition, the inspection operator 100 is standing in the empty space 36 (ground) after the ash processing device 6 is removed, and while visually viewing the inspection unit 32 through the ash discharge port 19, the inspection unit 32 is separated Operation moves.

With this inspection method, it is possible to easily move the interior of the furnace 8 while viewing the inspection unit visually, and the interior of the boiler 4 can be easily inspected. In addition, compared with the case where a scaffold is installed in the entire interior of the furnace 8 to inspect the interior of the boiler 4 from the scaffold, it is unnecessary to install a scaffold inside the furnace 8, so that the inspection period can be shortened and the inspection cost can be reduced. reduce. In addition, the inspection operator 100 can stand in the above-mentioned empty space 36 (ground) and operate the inspection unit 32 remotely, so the inspection unit 32 can be moved by remote operation without being hindered by the ash processing device 6.

In some embodiments, regarding the method of inspecting the inside of the boiler 4 described using FIG. 8, as shown in FIG. 9, a protective net 38 covering the ash discharge port 19 may be deployed below the ash discharge port 19. In this case, the protective net 38 is provided between the ash discharge port 19 and the inspection operator 100. In addition, the inspection operator 100 moves the inspection unit 32 by a remote operation while visually viewing the inspection unit 32 through the protective net 38.

Therefore, when the UAV 30 is dropped for any reason, the risk of collision between the dropped UAV and the inspection operator 100 can be reduced. In addition, since the protective net 38 is in a mesh shape, the inspection unit 32 can be easily moved by a remote operation while visually viewing the inspection unit 32 through the protective net 38.

Next, an example of the procedure of the inspection method of the inside of the boiler 4 described above will be described in detail with reference to FIGS. 10 and 11. Figs. 10 and 11 are a series of flowcharts showing a method of inspecting the inside of the boiler 4 according to an embodiment.

First, in S101, the operation of the boiler 4 is stopped. That is, the supply of fuel through a burner (not shown) provided in the furnace 8 is stopped. Next, in S102, the boiler 4 is cooled. Here, the operation of the press-in fan 40 and the operation of the attracting fan 42 are continued for a certain period of time, and the furnace 8 and its internal space 10 and the like are cooled by promoting ventilation in the furnace 8.

Next, in S103, the operation of the press-in fan 40 and the operation of the attracting fan 42 are stopped. Next, in S104, the water in the water tank 24 of the ash processing apparatus 6 (6A) is drained, and the water seal of the bottom part 8a of the furnace 8 is released. Next, in S105, the ash processing device 6 is disassembled and removed from below the furnace 8 (under the ash discharge port 19).

Next, in S106, the protective net 38 covering the ash discharge port 19 is deployed below the ash discharge port 19. Next, in S107, the inspection operator 100 is standing in the state of the empty space 36 after the ash processing apparatus 6 is removed, and the UAV 30 is remotely operated by the controller 34 through the ash discharge port 19 The inspection unit 32 is introduced toward the inside of the furnace 8. In addition, while visually viewing the inspection unit 32 through the ash discharge port 19 via the protective net 38, the inspection unit 32 is moved to the place to be inspected by remotely operating the UAV 30.

Next, in S108, the inside of the boiler 4 is photographed by the camera 28 included in the inspection unit 32, and a more detailed inspection is performed according to the acquired image.

Next, in S109, the inspection operator 100 remotely operates the UAV 30 through the controller 34, and moves the inspection unit 32 to the outside of the furnace 8 through the ash discharge port 19. Next, in S110, the protective net 38 is removed from below the ash discharge port 19, and in S111, the ash processing device 6 (6A) is carried under the furnace 8 and assembled.

Next, in S112, water is supplied to an appropriate water level in the water tank 24 of the ash treatment device 6 (6A), and the bottom 8a of the stove 8 is water-sealed. Next, in S113, the operation of the press-in fan 40 and the operation of the attracting fan 42 are started. Finally, in S114, the operation of the boiler 4 is started. That is, the supply of fuel through a burner (not shown) provided in the furnace 8 is started.

According to the method of inspecting the inside of the boiler 4 as described above, when the inspection unit 32 is moved inside the furnace 8, the inspection unit 32 is moved by remote operation while visually viewing the inspection unit 32 through the ash discharge port 19. Therefore, the inspection unit 32 can be easily moved in a wide range of the interior of the furnace 8 while visually inspecting the inspection unit 32, and the interior of the boiler 4 can be easily inspected. Moreover, compared with the case where a scaffold is installed in the entire interior of the furnace 8 to inspect the interior of the boiler 4 from the scaffold, the inspection unit 32 can be moved by remote operation without the scaffold provided in the interior of the furnace 8. Since the internal inspection of the boiler 4 is performed, the inspection period can be shortened and the inspection cost can be reduced, and the safety of the inspection operation can be improved. In addition, the other effects described above can also be obtained by using FIGS. 8 and 9 and so on.

In addition, the inspection operator 100 can perform the inspection of the interior of the boiler 4 by remotely operating the UAV 30, so it is not necessary to enter the interior of the furnace 8 for the inspection of the interior of the boiler 4. Therefore, even if the internal temperature of the furnace 8 is relatively high and dusty, the internal inspection of the boiler 4 can be performed in a good working environment, compared with the case where a scaffold is installed inside the furnace 8 , The cooling period of the furnace 8 in S102 can be shortened. Therefore, the work of putting the inspection unit 32 in the furnace 8 in S107 can be performed even if the temperature inside the furnace 8 is 60° C. or higher, and can be performed within 10 days after the boiler 4 stops operating. In addition, in the operation of putting the inspection unit 32 into the furnace 8, the temperature inside the furnace 8 is preferably 150° C. or lower. Thereby, it is possible to suppress the influence of the boiler radiant heat on the work environment of the inspection worker 100.

Next, using FIGS. 12-15, the inspection method of the inside of the boiler 4 in the boiler apparatus 2 (2B) of another embodiment is demonstrated.

Fig. 12 is a schematic diagram showing a schematic configuration of a boiler device 2 (2B) of another embodiment. Fig. 13 is a schematic diagram showing a schematic cross section of the boiler device 2 (2B) shown in Fig. 12. Figures 14 and 15 are a series of flowcharts showing a method of inspecting the inside of the boiler 4 in the boiler device 2 (2B). Fig. 16 is a diagram showing how the inside of the boiler 4 is inspected in the boiler device 2 (2B).

As shown in Figures 12 and 13, in the boiler device 2 (2B) shown in Figures 12 and 13, the structure of the boiler 4 including the furnace 8 is similar to the use of Figures 1 and 2 The described boiler 4 has the same structure, so the description is omitted. The boiler device 2 (2B) shown in Figs. 12 and 13 and the boiler device 2 (2A) shown in Figs. 1 and 2 are different in the structure of the ash treatment device 6.

As shown in Figure 12 or Figure 13, the ash processing device 6 (6B) of the boiler device 2 (2B) includes: a plurality of clinker hoppers 44 (in the example shown, there are two clinker hoppers 44) , And a plurality of feeders 46 respectively arranged at the bottom of the plurality of clinker hoppers 44. Water is stored in each of the clinker hopper 44.

The ash (clinker) falling from the ash discharge port 19 at the bottom of the furnace 8 is cooled by the water in the clinker hopper 44, and then crushed by the feeder 46 installed at the bottom of the clinker hopper 44 It has a size suitable for pipe transportation, is transported together with water by the water pump 45, and is transported to an ash processing funnel (hopper) (not shown) through a dehydrator (not shown).

Here, the method of inspecting the inside of the boiler as shown in Figs. 14 and 15 will be explained. First, in S201, the operation of the boiler 4 is stopped. That is, the supply of fuel through a burner (not shown) provided in the furnace 8 is stopped. Next, in S202, the boiler 4 is cooled. Here, the operation of the press-in fan 40 and the operation of the attracting fan 42 are continued for a certain period of time, and the furnace 8 and its internal space 10 and the like are cooled by promoting ventilation in the furnace 8.

Next, in S203, the operation of the press-in fan 40 and the operation of the attracting fan 42 are stopped. And, in S204, the water inside the clinker hopper 44 of the ash processing apparatus 6 (6B) is drained, and the water seal of the bottom part 8a of the furnace 8 is released.

Next, in S205, the inspection operator 100 enters the clinker hopper 44 from an unshown entrance and exit provided in the clinker hopper 44, and installs a scaffold 48 inside the clinker hopper 44 (refer to Figure 16). ). Here, in the pair of side walls 50a and 50b facing each other in the clinker hopper 44, one side wall 50a spans the other side wall 50b, and a plate-shaped scaffold 48 is provided, for example. Since the pair of side walls 50a and 50b of the clinker hopper 44 are inclined so that the interval between the side walls 50a and 50b becomes smaller as they go downward, the scaffold 48 can be easily installed.

Next, in S206, the inspection operator 100 is standing on the scaffold 48 inside the clinker hopper 44, and operates the UAV 30 remotely from the scaffold 48 through the controller 34 through the ash discharge port. 19 Lead the inspection unit 32 toward the inside of the furnace 8. In addition, the inspection operator 100 moves the inspection unit 32 to the place to be inspected by remotely operating the UAV 30 while visually viewing the inspection unit 32 through the ash discharge port 19 while standing on the scaffold 48.

Next, in S207, the inside of the boiler 4 is photographed by the camera 28 included in the inspection unit 32, and a more detailed inspection is performed according to the acquired image.

Next, in S208, the inspection operator 100 remotely operates the UAV 30 through the controller 34, and moves the inspection unit 32 to the outside of the furnace 8 through the ash discharge port 19. Next, in S209, the scaffold 48 inside the clinker hopper 44 is removed to the outside of the clinker hopper 44.

Next, in S210, water is supplied to an appropriate water level in the clinker hopper 44, and the bottom 8a of the stove 8 is water-sealed. Next, in S211, the operation of the press-in fan 40 and the operation of the attracting fan 42 are started. Finally, in S212, the operation of the boiler 4 is started. That is, the supply of fuel through a burner (not shown) provided in the furnace 8 is started.

According to the method of inspecting the inside of the boiler 4 as described above, when the inspection unit 32 is moved inside the furnace 8, the inspection unit 32 is moved by remote operation while visually viewing the inspection unit 32 through the ash discharge port 19. Therefore, the inspection unit 32 can be easily moved in a wide range of the interior of the furnace 8 while visually inspecting the inspection unit 32, and the interior of the boiler 4 can be easily inspected. Moreover, compared with the case where a scaffold is installed in the entire interior of the furnace 8 to inspect the interior of the boiler 4 from the scaffold, the inspection unit 32 can be moved by remote operation without the scaffold provided in the interior of the furnace 8. Since the internal inspection of the boiler 4 is performed, the inspection period can be shortened and the inspection cost can be reduced, and the safety of the inspection operation can be improved.

And by flying the inspection unit 32 inside the furnace 8 with the operation of the pressing fan 40 and the attracting fan 42 stopped, the inside of the furnace 8 caused by the operation of the pressing fan 40 and the attracting fan 42 will not be received. Due to the influence of the turbulence of the airflow, the inspection unit 32 can be easily moved by remote operation.

In addition, the inspection operator 100 can perform the inspection of the inside of the boiler 4 by remotely operating the UAV 30, so it is not necessary to enter the inside of the furnace 8 for the inspection of the inside of the boiler 4. Therefore, even if the internal temperature of the furnace 8 is relatively high, the internal inspection of the boiler 4 can be performed. Compared with the case where a scaffold is installed inside the furnace 8, the furnace 8 can be cooled in S202. The period is shortened. Therefore, the work of putting the inspection unit 32 into the furnace 8 in S206 can be performed even if the temperature inside the furnace 8 is 60° C. or higher, and can be performed within 10 days after the boiler 4 stops operating.

The present invention is not limited to the above-mentioned embodiment, and also includes a form in which a modification is added to the above-mentioned embodiment, and a form in which these forms are appropriately combined.

For example, in some of the above-mentioned embodiments, the case where the inspection unit 32 is moved by the UAV 30 inside the furnace 8 is described, but the means for moving the inspection unit 32 is not limited to UAV, for example, as shown in Fig. 17 The operating stick 52 is also available.

In the embodiment shown in FIG. 17, the inspection unit 32 (32B) includes a camera 28 as a photographing device, and an operation stick 52 to which the camera 28 is fixed to the tip. The inspection operator 100 can visually inspect the inspection unit The camera 28 of 32 is moved by operating the stick 52 while moving the camera 28. In this case, if the operating rod 52 can reach the range, the inside of the boiler 4 can be easily inspected by the inspection unit 32.

In addition, as shown in Figure 17, the inspection operator 100 is standing in the state of the belt conveyor 26 in the ash processing device 6(A) of the boiler device 2(2A), passing the inside of the boiler 4 In the case where the inspection unit 32 (32B) performs inspection, the inspection operator 100 may also stand in the empty space 36 (refer to FIG. 8) after removing the above-mentioned ash processing device 6 (6A), The interior of the boiler 4 is inspected using the inspection unit 32 (32B). In addition, in the boiler device 2 (2B), the inspection unit 32 (32B) may be used while standing on the scaffold 48 provided inside the clinker hopper 44 of the above-mentioned ash processing device 6 (6B). Check the inside of boiler 4.

In addition, some of the above-mentioned boiler internal inspection methods have exemplified the method of inserting the inspection unit 32 into the furnace 8 through the ash discharge port 19 of the furnace 8. However, in other embodiments, it may be formed from the furnace 8 The inspection unit 32 (32A) is put into the furnace 8 through the manholes of the side wall of the ash discharge port 19 while the inspection unit 32 (32A) is visually inspected, and the inspection unit 32 (32A) is moved by remote operation.

The content of each of the above-mentioned embodiments can be grasped as follows, for example.

(1) The boiler internal inspection method of the present invention is provided with: an inspection unit for inspecting the interior of a boiler (for example, the above-mentioned boiler 4) (for example, the above-mentioned inspection means 32A, 32B) is placed in the furnace of the aforementioned boiler (for example, the above-mentioned Steps inside the furnace 8); and while visually inspecting the inspection unit through the ash discharge port (for example, the ash discharge port 19) formed at the lower end of the water wall of the furnace (for example, the water wall 14) The step of moving the unit; and the step of inspecting the inside of the boiler by the inspection unit.

According to the boiler internal inspection method described in (1) above, when the inspection unit is moved inside the furnace, the inspection unit is moved while visually viewing the inspection unit through the ash discharge port. Therefore, the work of installing scaffolding inside the furnace becomes unnecessary, the work time can be shortened, and the boiler stop time can be shortened. In addition, since the waiting time required for the cooling of the furnace can be shortened, the inspection work can be started early, and the shutdown time of the inspection boiler can be shortened. Moreover, because the inspection work can be started early, the detailed inspection points can be found early, and early preparation for the follow-up process is possible, and the shutdown time of the boiler can be shortened. In this way, the internal inspection of the boiler can be performed early. And by visually inspecting the unit from the outside of the furnace through the ash discharge port, the inside of the boiler can be seen within the effective field of view. Therefore, the position of the inspection unit can be easily grasped and manipulated, and the inspection unit can be easily moved in a wide range of the interior of the boiler while visually inspecting the inspection unit, and the interior of the boiler can be easily inspected. And because the inspection unit is moved while visually viewing the inspection unit from the outside of the furnace through the ash discharge port, the inspection operator can safely operate the inspection unit. Therefore, the inspection operator can focus on the position grasp and manipulation of the inspection unit. In addition, "inspection" here means detecting an object. For example, if the inspection unit is a camera, it means photographing the object.

(2) In some embodiments, for the boiler internal inspection method of (1) above, in the step of putting the inspection unit into the furnace, the inspection unit is put into the furnace through the ash discharge port internal.

According to the boiler internal inspection method described in (2) above, by inserting the inspection unit into the furnace through the ash discharge port, the inspection unit can be easily moved while viewing the inspection unit through the ash discharge port.

(3) In some embodiments, for the boiler internal inspection method of (1) or (2), in the step of moving the inspection unit, the scaffold is not installed in the furnace. Check unit movement.

According to the boiler internal inspection method in (3) above, it is compared with the situation where a scaffold is installed inside the furnace to inspect the interior of the boiler from the scaffold, because the inspection can be performed without the scaffold installed inside the furnace. The unit is moved to inspect the inside of the boiler, so the inspection period can be shortened, the inspection cost can be reduced, and the safety of the inspection operation can be improved.

(4) In some embodiments, the boiler internal inspection method of any one of the above (1) to (3) further includes an ash treatment device (for example, the above ash discharge port) arranged below the ash discharge port. Processing device 6A) In the step of removing the inspection unit, in the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit from the empty space after the ash processing device is removed (for example, the above-mentioned space 36) .

According to the boiler internal inspection method described in (4) above, the inspection operator’s line of sight is not obstructed by the ash processing device, and the inspection unit can be moved.

(5) In some embodiments, with respect to the boiler internal inspection method of any one of (1) to (3), in the step of moving the inspection unit, it is arranged from below the ash discharge port. The inside of the ash processing apparatus (for example, the above-mentioned ash processing apparatus 6A, 6B) visually observes the inspection unit while moving the inspection unit.

According to the boiler internal inspection method described in (5) above, it is not necessary to dismantle the ash processing device, so the internal inspection of the boiler can be easily performed.

(6) In some embodiments, in the boiler internal inspection method of (5) above, in the step of moving the inspection unit, while standing on a conveyor belt ( For example, while visually viewing the inspection unit in the state of the belt conveyor belt 26) described above, the inspection unit is moved.

According to the boiler internal inspection method described in (6) above, it is not necessary to dismantle the ash processing device, so the internal inspection of the boiler can be easily performed. Also, because the unit can be visually inspected while standing on the conveyor belt, the unit can be visually inspected from a higher position than when the unit is visually inspected from the ground. Therefore, it becomes an inspection unit which is easy to move while visually observing the high position of a stove.

(7) In some embodiments, the boiler interior inspection method of (6) above further includes a step of draining the water inside the ash treatment device before standing on the conveyor belt.

According to the boiler internal inspection method described in (7) above, in the boiler internal inspection method described in (6) above, when the inspection worker moves inside the ash processing device, it is possible to prevent the water inside the ash processing device from obstructing the movement of the inspection worker And security, etc.

(8) In some embodiments, the boiler internal inspection method of any one of (1) to (3) above further includes a clinker hopper in an ash processing device arranged below the ash discharge port. (For example, the above-mentioned clinker hopper 44) is installed inside the scaffold (for example, the above-mentioned scaffold 48) step, in the step of moving the inspection unit, while standing on the inside of the clinker hopper provided in the step While viewing the inspection unit visually in the scaffolding state, move the inspection unit.

According to the boiler internal inspection method described in (8) above, it is not necessary to dismantle the ash processing device, so the internal inspection of the boiler can be easily performed. Furthermore, since the unit can be visually inspected while standing on the scaffold provided inside the clinker hopper, the unit can be visually inspected from a higher position than when the unit is visually inspected from the ground. Therefore, it becomes an inspection unit which is easy to move while visually observing the high position of a stove.

(9) In some embodiments, the boiler internal inspection method of (8) above further includes a step of draining the water inside the clinker hopper before installing a scaffold inside the clinker hopper.

According to the boiler internal inspection method of (9), when the inspection worker moves inside the clinker hopper, it is possible to prevent the water inside the clinker hopper from obstructing the movement and safety of the inspection worker.

(10) In some embodiments, for the boiler internal inspection method of any one of the above (1) to (9), in the step of putting the inspection unit into the furnace, it is possible to stop the boiler Within 10 days after operation, put the inspection unit into the furnace and end the inspection work.

According to the boiler internal inspection method described in (10) above, the inspection operator does not need to enter the interior of the furnace for inspection of the interior of the boiler. Therefore, even if the temperature inside the furnace is high and dusty, the inside of the boiler can be inspected. Compared with the case where a scaffold is installed inside the furnace, the cooling period of the furnace before inspection can be shortened. , It can be carried out within 10 days from the shutdown of the boiler operation.

(11) In some embodiments, for the boiler interior inspection method of any one of (1) to (10) above, in the step of putting the inspection unit into the interior of the furnace, The inspection unit is placed in the boiler in a state where the temperature is 60°C or higher.

According to the boiler internal inspection method described in (11) above, the inspection operator does not need to enter the interior of the furnace for inspection of the interior of the boiler. Therefore, even if the temperature inside the furnace is 60°C or higher, the inside of the boiler can be inspected. Therefore, compared with the case where a scaffold is provided inside the furnace, the cooling period of the furnace before inspection work can be shortened.

(12) In some embodiments, the boiler internal inspection method of any one of (1) to (11) above further includes a method of deploying a protective net (for example, the aforementioned protective net 38) covering the ash discharge port. Step: In the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit through the protective net.

According to the boiler internal inspection method described in (12), when the inspection unit is dropped for any reason, the risk of collision between the dropped inspection unit and the inspection operator can be reduced. In addition, since the protective net is a mesh, the inspection unit can be easily moved while visually inspecting the unit through the protective net.

(13) In some embodiments, for the boiler internal inspection method of any one of the above (1) to (12), the inspection unit includes UAV (such as the above UAV30) or an operating rod (such as the above operation Stick 52). In the step of moving the inspection unit, use the UAV or the operating stick to move the inspection unit.

According to the boiler internal inspection method described in (13), the inspection unit can easily inspect the inspection location far away from the inspection operator.

(14) In some embodiments, in the boiler interior inspection method of (13), the inspection unit includes the UAV (for example, the UAV30), and further includes a ventilation fan for stopping fluid movement in the furnace In the step of operating (for example, the above-mentioned press-in fan 40 and the attracting fan 42), in the step of moving the inspection unit, the inspection unit is moved in a state where the operation of the ventilation fan is stopped.

According to the boiler internal inspection method described in (14) above, the UAV can be flown inside the furnace with the ventilation fan stopped, so it will not be affected by the turbulence of the airflow inside the furnace caused by the operation of the ventilation fan. The inspection unit can be easily moved by remote operation.

(15) In some embodiments, the boiler internal inspection method of any one of (1) to (14) above further includes a photographing device (such as the aforementioned camera 28) included in the aforementioned inspection unit. The procedure of photographing the interior of the boiler mentioned above.

According to the boiler internal inspection method described in (15) above, the interior of the boiler can be photographed by a photographing device, and more detailed inspections can be performed according to the acquired image.

(16) In some embodiments, with respect to the boiler interior inspection method of any one of (1) to (15) above, in the step of moving the inspection unit, while viewing the effectiveness of the interior of the boiler The position of the range of the field of view visually observes the inspection unit while moving the inspection unit.

According to the boiler internal inspection method described in (16) above, the inside of the boiler can be viewed within the effective field of view. Therefore, the position of the inspection unit can be easily grasped and manipulated, the inspection unit can be easily moved in a wide range of the interior of the furnace while visually inspecting the inspection unit, and the interior of the boiler can be inspected easily.

2: Boiler device 4: boiler 6: Ash processing device 8: Stove 8a: bottom 10: Internal space 12: External space 14: Water wall 14a, 15a: lower end 15: Transition notch 16: Fins 18: Water pipe 19: Ash discharge outlet 20: top 22: Inlet at the bottom of the boiler 24: sink 26: Belt conveyor belt 28: Camera 32: Inspection unit 34: Controller 36: Space 38: Protective net 40: Press in the fan 42: lure a fan 44: Clinker hopper 45: water pump 46: feeding machine 48: Scaffold 50a, 50b: side wall 52: operation stick 54,56: heat exchanger 100: Inspection operator

[Figure 1] A schematic diagram showing a schematic configuration of a boiler device 2 (2A) according to an embodiment. [Fig. 2] A schematic diagram showing enlarged the schematic cross section of the lower part of the boiler device 2 (2A) shown in Fig. 1. [Fig. 3] A schematic diagram showing a schematic cross-section of the boiler device 2 (2A) shown in Fig. 1. [Figure 4] A horizontal cross-sectional view of the water wall 14 shown in Figures 1 and 2. [Fig. 5] A diagram showing an example of the state of inspecting the inside of the furnace 8 of the boiler 4 in the boiler device 2 (2A). [Figure 6A] A schematic diagram showing the relationship between the boiler 4 and the effective visual field of the inspection worker 100. [Fig. 6B] A diagram showing the appearance of the inside of the stove 8 looking up from the bottom of the stove 8. [Figure 7] A schematic diagram showing the relationship between the panels of the heat exchangers 54, 56 and the standing position of the inspection worker 100. [Figure 8] A diagram showing an example of the state of inspecting the interior of the boiler 4 in the boiler device 2 (2A). [Figure 9] A diagram showing an example of inspection of the inside of the boiler 4 in the boiler device 2 (2A). [Fig. 10] A part of a flowchart showing an example of a method of inspecting the inside of the boiler 4 according to an embodiment. [Fig. 11] The remainder of the flowchart showing an example of the method of inspecting the inside of the boiler 4 according to an embodiment. [Figure 12] A schematic diagram showing the schematic configuration of a boiler device 2 (2B) of another embodiment. [Fig. 13] A schematic diagram showing a schematic cross-section of the boiler device 2 (2B) shown in Fig. 12. [Figure 14] A part of a flowchart showing an example of an inspection method of the inside of the boiler 4 in the boiler device 2 (2B). [FIG. 15] The remainder of the flowchart showing an example of the method of inspecting the inside of the boiler 4 in the boiler device 2 (2B). [Figure 16] A diagram showing an example of the state of inspecting the interior of the boiler 4 in the boiler device 2 (2B). [Figure 17] A diagram showing an example of the state of inspecting the interior of the boiler 4 in the boiler device 2 (2A).

2: Boiler device

2A: Boiler installation

4: boiler

6: Ash processing device

6A: Ash treatment device

8: Stove

10: Internal space

12: External space

14: Water wall

14a: bottom

15: Transition notch

15a: bottom

19: Ash discharge outlet

24: sink

26: Belt conveyor belt

28: Camera

30: UAV

32: Inspection unit

32A: Inspection unit

34: Controller

100: Inspection operator

Claims (16)

A method for internal inspection of boilers, including: Steps of putting the inspection unit for inspecting the inside of the boiler into the inside of the furnace of the aforementioned boiler; and The step of moving the inspection unit while visually observing the inspection unit through the ash discharge port formed at the lower end of the water wall of the furnace; and The procedure of inspecting the inside of the boiler by the inspection unit. Such as the internal inspection method of the boiler in claim 1, where: In the step of putting the inspection unit into the furnace, the inspection unit is inserted into the furnace through the ash discharge port. Such as the internal inspection method of the boiler in claim 1 or 2, where: In the step of moving the inspection unit, the inspection unit is moved in a state where the scaffold is not provided in the interior of the furnace. Such as the internal inspection method of the boiler in claim 1 or 2, where: It further includes a step of removing the ash processing device arranged below the ash discharge port, In the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit from the empty space after the ash processing device is removed. Such as the internal inspection method of the boiler in claim 1 or 2, where: In the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit from the inside of the ash processing apparatus arranged below the ash discharge port. Such as the boiler internal inspection method of claim 5, where: In the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit while standing on the conveyor belt for discharging the ash inside the ash processing apparatus. Such as the boiler internal inspection method of claim 6, where: It further includes a step of draining water from the inside of the ash processing device before standing on the conveyor belt. Such as the internal inspection method of the boiler in claim 1 or 2, where: The method further includes a step of installing a scaffold inside the clinker hopper in the ash processing device arranged below the ash discharge port, In the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit while standing on the scaffold provided inside the clinker hopper. Such as the boiler internal inspection method of claim 8, where: It further includes a step of draining the water inside the clinker hopper before installing a scaffold inside the clinker hopper. Such as the internal inspection method of the boiler in claim 1 or 2, where: In the step of putting the inspection unit into the furnace, the inspection unit is put into the furnace within 10 days after stopping the operation of the boiler. Such as the internal inspection method of the boiler in claim 1 or 2, where: In the step of putting the inspection unit into the inside of the furnace, the inspection unit is put into the inside of the furnace in a state where the temperature of the inside of the furnace is 60° C. or higher. Such as the internal inspection method of the boiler in claim 1 or 2, where: It is further provided with the step of unfolding the protective net covering the aforementioned ash discharge port, In the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit through the protective net. Such as the internal inspection method of the boiler in claim 1 or 2, where: The aforementioned inspection unit contains UAV or operating stick, In the step of moving the inspection unit, the UAV or the operating stick is used to move the inspection unit. Such as the boiler internal inspection method of claim 13, where: The aforementioned inspection unit includes the aforementioned UAV, It further includes a step of stopping the operation of the ventilation fan that moves the fluid inside the furnace, In the step of moving the inspection unit, the inspection unit is moved in a state where the operation of the ventilation fan is stopped. Such as the internal inspection method of the boiler in claim 1 or 2, where: It further includes a step of photographing the inside of the boiler by the photographing device included in the inspection unit. Such as the internal inspection method of the boiler in claim 1 or 2, where: In the step of moving the inspection unit, the inspection unit is moved while visually viewing the inspection unit from a position where the effective visual field of the inside of the boiler can be seen.

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