JP5420726B2 - Clinker ash removal apparatus and clinker ash removal method - Google Patents

Description

  The present invention relates to an apparatus and a method for removing clinker ash adhering to the inside of a coal boiler or the like.

  In a coal-fired power plant, clinker ash adheres to the boiler heat transfer tube in the furnace of the coal boiler, the periphery of the coal burner port, and the like. Here, the clinker ash is obtained by melting and solidifying coal ash particles combusted in a furnace. In recent years, coal-fired power plants sometimes use inferior coal with many impurities as fuel to reduce fuel costs. When inferior coal with many low melting point impurities such as Fe and Mg is used as fuel, clinker ash adhering to the heat transfer tube of the secondary superheater may grow to a size of several meters, This hinders work in the furnace.

  As a technique for removing such clinker ash, a technique for pulverizing clinker ash by high-pressure injection of a fluid such as water has been proposed (see, for example, Patent Documents 1 and 2).

JP 2010-243122 A JP 2000-111029 A

  However, high-pressure injection of fluid may cause corrosion or damage to the heat transfer tube. If removal is performed manually with a stick or a chisel to prevent corrosion and breakage, enormous work time will be required. For this reason, the technique which removes clinker ash adhering in a furnace more effectively and safely was calculated | required. In particular, since the secondary superheater is located at a height of 50 m or more from the floor of the furnace, a great deal of labor has been required to remove the clinker ash adhering to the lower end of the secondary superheater.

  The present invention has been made under such a technical background. Accordingly, an object of the present invention is to propose an apparatus and a removal method for effectively removing clinker ash adhering to the lower end portion of a secondary superheater particularly in a coal-fired power plant.

As a result of intensive studies, the inventors have used a long scissor-like clinker ash removal device that has improved bending resistance by inserting a long tube equipped with a lifting tool at the tip into the sheath tube, We have come up with the idea that the above-mentioned purpose can be achieved. Therefore, the clinker ash removing apparatus of the present invention includes a long tube, a sheath tube, and a hanging tool. A long tube is inserted into the sheath tube so as to be movable in the axial direction. The hanging tool is attached to one end of the long tube and has a chisel. Further, the clinker ash removing apparatus includes a first support portion that supports the tip of the sheath tube on the side on which the lifting tool is provided so as to be movable in the vertical direction, and a side opposite to the side on which the lifting tool is provided. The rear end portion of the sheath tube is provided with a second support portion that supports the sheath tube so that it can precess. In addition, the first support unit can freely change the length of the wire to be fed, and the coal boiler through a peephole that is fed from the first winder and provided above the manhole of the coal boiler. A wire that suspends a tip portion located inside, and a second support portion that is a rigid support frame fixed to the manhole, and a rear upper end portion of the support frame that extends in the vertical direction. A second hoisting machine fixed to the upper hoisting bracket, and a third hoisting machine fixed to the lower hoisting metal fitting on the lower portion in the vertical direction of the support frame.

  Moreover, the clinker ash removal method of this invention crushes and removes clinker ash by making the chisel of the above-mentioned clinker ash removal apparatus contact clinker ash.

  The clinker ash removal apparatus and the removal method of the present invention having the above-described configuration can effectively remove clinker ash adhering to the lower end portion of the secondary superheater of a coal-fired power plant.

It is a schematic diagram which shows typically the structure of the coal boiler used in a coal-fired power station. It is the elements on larger scale which expand and show the peephole and manhole which are provided in a coal boiler. It is a perspective view which shows the mode of the clinker ash adhering to the lower end part of a secondary superheater. It is a figure which shows typically an example of the use condition in the furnace of a clinker ash removal apparatus. (A) is a schematic diagram which shows the whole structure of the main body of a clinker ash removal apparatus, (B) is a schematic diagram which shows the structure of a long tube, (C) is a model which shows the structure of a sheath tube FIG. (A) is a schematic diagram schematically showing the structure of kelen, which is one mode of a hanging tool, and (B) is a schematic diagram schematically showing the structure of a flux chipper, which is another mode of the hanging tool. is there. (A) is a front view of the chisel of a 1st aspect, (B) is a side view of the chisel of (A). (A) is a front view of the chisel of a 2nd aspect, (B) is a side view of the chisel of (A). It is a front view of the chisel of the 3rd mode. It is a schematic diagram which shows typically the structure of a 1st support part. It is a schematic diagram which shows the structure of a 2nd support part typically. (A) And (B) is a schematic diagram which shows the process step of a clinker ash removal method in order. (A) And (B) is a schematic diagram which shows in order the process step of the clinker ash removal method following FIG. 12 (B). (A) And (B) is a schematic diagram which shows in order the process step of the extension method of a sheath tube and a long tube especially in a clinker ash removal method. It is a schematic diagram which shows the process step of the extension method of a sheath pipe and a long tube following FIG. 14 (B).

  Embodiments of the present invention will be described below with reference to the drawings. In each figure, the shape, size, and arrangement relationship of each component are schematically shown to such an extent that the present invention can be understood. Moreover, although the preferable structural example of this invention is demonstrated hereafter, the material of each component, a numerical condition, etc. are only a suitable example. Therefore, the present invention is not limited to the following embodiments. Moreover, in each figure, the same code | symbol is attached | subjected to a common component and the overlapping description may be abbreviate | omitted. In addition, reference numerals of components that have a clear correspondence with other drawings may be omitted.

(Clinker ash)
First, with reference to FIGS. 1 to 3, a clinker ash that is a removal target of a clinker ash removal device (hereinafter, also simply referred to as a removal device) of the present invention will be described. FIG. 1 is a schematic diagram schematically showing the structure of a coal boiler used in a coal-fired power plant. FIG. 2 is a partially enlarged view showing a peephole and a manhole provided in the coal boiler. FIG. 3 is a perspective view showing a state of clinker ash adhering to the vicinity of the lower end portion of the secondary superheater.

  First, the structure of a coal boiler (hereinafter also referred to as a boiler) will be briefly described with reference to FIG. The boiler 100 includes a furnace 102 and a rear heat transfer unit 104. The furnace 102 is divided into a lower region 102D provided with a plurality of coal burners 102a and an upper region 102U provided with secondary, tertiary and quaternary superheaters 102b, 102c and 102d. The secondary to quaternary superheaters 102b, 102c, and 102d are each an assembly of a large number of heat transfer tubes bent into a predetermined shape, and superheat the steam flowing inside.

  The rear heat transfer unit 104 is an assembly of a plurality of rear heat transfer tubes arranged regularly, and heats a fluid to be heated such as steam and water flowing through the rear heat transfer tube. The boiler 100 shown in this example has a height measured in the vertical direction of about 70 m, and the horizontal length of the furnace 102 and the rear heat transfer section 104 combined is about 40 m.

  In addition, a manhole 106 and a viewing hole 108 are provided on the wall surface of the upper region 102U.

  As shown in FIG. 2, the peep hole 108 is an opening having a diameter of 10 to 20 cm for visually inspecting the secondary superheater 102 b and the like, and is closed with a lid (not shown) during operation of the boiler 100. . A manhole 106 is provided below the viewing hole 108 in the vertical direction. In this example, a manhole 106 is provided about 8 m below the peep hole 108.

  The manhole 106 is a substantially elliptical opening provided on the wall of the furnace 102 and is closed with a lid (not shown) when the boiler 100 is in operation. In this example, the length of the manhole 106 in the major axis direction (vertical direction) of the ellipse is about 80 cm, and the length of the ellipse in the minor axis direction (horizontal direction) is about 40 cm.

  Next, clinker ash adhering to the furnace 102 will be described with reference to FIG. FIG. 3 shows the clinker ash 110 attached to the vicinity of the lower end portion of the secondary superheater 102b, which is a removal target of the present invention. A large number of heat transfer tubes 112 are attached to the heat transfer tubes 112 at the lower end of the secondary superheater 102b, which bends in a U-shape, so that the clinker ash 110 is attached. In this example, the size of the clinker ash 110 is on the order of several meters. In addition, the distance from the manhole 106 to the lower end part of the secondary superheater 102b, ie, the clinker ash 110, is 7 to 9 m.

Generally, the clinker ash 110 is a pumice-like or glass-like massive substance having a specific gravity of about 2 and mainly composed of SiO ₂ , Al ₂ O ₃ and Fe ₂ O ₃ . The mechanical strength until the clinker ash 110 is destroyed is slightly smaller than the strength until the lightweight concrete block is destroyed.

(Summary of Invention)
Next, with reference to FIG. 4, the removal apparatus and the clinker ash removal method of the present invention (hereinafter also simply referred to as the removal method) will be schematically described. FIG. 4 is a diagram schematically illustrating an example of a usage state of the removal apparatus in the furnace.

  The removal device 10 includes a long tube 12, a sheath tube 14 through which the long tube 12 is inserted, and a suspension tool 16 attached to one end of the long tube 12. Furthermore, the removal apparatus 10 includes a support portion 18 as an optional member. Details of these configurations will be described later. Moreover, the removal apparatus 10 other than the support part 18, ie, the elongate pipe | tube 12, the sheath pipe | tube 14, and the hook-shaped structure provided with the lifting tool 16, is also called the main body 10H. Further, hereinafter, the direction toward the lifting tool 16 along the extending direction of the long tube 12 is also referred to as an axial direction or a vibration direction, and is indicated by an arrow D1. Further, the end of the long tube 12 on the side where the lifting tool 16 is attached is referred to as a front end, and the end opposite to the front end is referred to as a rear end.

  The long tube 12 and the sheath tube 14 of the removing device 10 are configured as long double tubes. The long pipe 12 which is a pipe inside the double pipe is inserted through a sheath pipe 14 which is a pipe outside the double pipe so as to be movable in the axial direction D1.

  The lifting tool 16 is provided with a chisel 16 a for crushing the clinker ash 110 on the tip side thereof, and is attached to the tip of the long tube 12. The suspension tool 16 is a power tool that receives supply of compressed air and reciprocates (vibrates) at high speed in the vibration direction D <b> 1 to crush the clinker ash 110. “Hatsuri” means that rocks are crushed and scraped off.

  The total length, which is the length measured in the axial direction D1 of the main body 10H, is 7 m or more which is the shortest distance from the manhole 106 to the clinker ash 110. The main body 10H is inserted into the furnace 102 from the manhole 106, and when the clinker ash 110 is crushed, most of the entire length is located in the furnace 102. Further, on the outside of the manhole 106, an operation portion 10A for operating the operator 16a to move the chisel 16a protrudes by about 1 m.

  The support unit 18 of the removal apparatus 10 includes a first support unit 20 and a second support unit 22.

The 1st support part 20 supports the front-end | tip part side of the sheath pipe | tube 14 so that the main body 10H can move freely to a perpendicular direction. The first support portion 20 is provided with a first hoist 20 ₁ and the wire 20 ₂ and hanging bracket 20 _3. Incidentally, hanging bracket 20 ₃ are attached to peephole 108.

The second supporting portion 22, and a support frame 22 ₁ and the second hoisting machine 22 ₂ and the third hoist 22 _3. The 2nd support part 22 is attached to the manhole 106, and supports the rear-end part side of the sheath pipe 14 so that precession movement is possible, as shown with a dotted line in the figure. As shown by the dotted line, the precession movement means that the sheath tube 14 (main body 10H) can freely move within a straight cone having the second support portion 22 as a fulcrum at the apex and the sheath tube 14 as a generating line. Indicates to do.

  Next, a method for removing the clinker ash 110 using the removing device 10 will be briefly described. Schematically, the chisel 16a on the tip end side of the main body 10H is aimed and pressed against the clinker ash 110 (hereinafter also referred to as positioning), and the clinker ash 110 is crushed by operating the lifting tool 16. And remove it. As described above, since the size of the clinker ash 110 attached to the secondary superheater 102b may reach several meters, the clinker ash 110 is removed by repeating positioning and crushing of the chisel 16a several times.

In positioning, the vertical position (height) of the chisel 16 a is adjusted by the first support portion 20. Specifically, while viewing the chisel 16a from the manhole 106, the operator to position the vertical by adjusting the length of the wire 20 ₂ for feeding out the first hoist 20 _1.

  Further, the positioning in the horizontal direction is performed by manually shaking the operation unit 10A of the removing device 10 left and right by the operator. That is, since the sheath tube 14 precesses about the second support portion 22 as a fulcrum, if the operation portion 10A is moved to the left and right, the chisel 16a can be moved to the right and left, respectively.

  In this way, the height of the chisel 16a is adjusted by the first support portion 20, and further, the chisel 16a is positioned at a desired position by swinging the main body 10H left and right with the second support portion 22 as a fulcrum. Then, the long tube 12 of the operation unit 10A is pushed forward in the axial direction D1, and the clinker ash 110 is crushed by operating the hanging tool 16 while bringing the chisel 16a into contact with the clinker ash 110 with an appropriate pressure.

(Body)
Next, the main body will be described in detail with reference to FIG. FIG. 5A is a schematic diagram showing the overall structure of the main body, FIG. 5B is a schematic diagram showing the structure of a long tube, and FIG. 5C shows the structure of a sheath tube. It is a schematic diagram.

  As shown in FIG. 5 (A), the main body 10H is configured by inserting a long tube 12 having a long length through a sheath tube 14 having a relatively short length in the axial direction D1. Thus, by using the main body 10H as a double pipe, the bending of the main body 10H can be suppressed as compared with the case where the long pipe 12 is used alone. The sheath tube 14 functions as a guide for supporting the long tube 12 inserted therein so as to be movable in the axial direction D1. In addition, the sheath tube 14 suppresses the bending of the long tube 12 and the swinging tool 16 caused by the bending, and improves the operability of the removing device 10.

  The difference in length between the sheath tube 14 and the long tube 12 is preferably set to a value in the range of 2 to 3 m. By setting the difference in length to 2 m or more, the length of the sheath tube 14 whose mass per unit length is larger than that of the long tube 12 can be suppressed, and the total weight of the main body 10H can be reduced. Thereby, the operativity of the main body 10H can be improved. Further, by setting the difference in length to 3 m or less, the deflection of the protruding portion of the long tube 12 protruding from the sheath tube 14 can be practically sufficiently reduced, and the operability of the main body 10H can be improved.

(Long tube)
As shown in FIG. 5 (B), the long tube 12 is configured as a rigid pipe with less bending. In this example, a carbon steel pipe for piping having a nominal diameter of 20 A is used as the long pipe 12. Further, the long tube 12 is configured to be divided into three parts with respect to the axial direction D1. That is, the long tube 12 includes an elongate main tube 12 _1, and the first long extension pipe 12 _2, and a second elongate extension pipe 12 _3.

The connecting portion of the long main pipe 12 ₁ and the first long extension pipe 12 _2, (also referred to as quick connect or quick fitting.) Quick coupling 12a is provided, the two pipe 12 ₁ and 12 ₂ Can be connected simply by fitting in the quick coupling 12a. As described below, the elongated tube 12, since also serves as a chipping power transmission tube for supplying compressed air to the tool 16, the quick coupling 12a, the two pipe 12 ₁ and 12 ₂ are hermetically sealed. Incidentally, similarly, the chipping tool 16 and elongate main 12 ₁ of the connecting portion, the connecting portion of the first and second long extension pipe 12 ₂ and 12 _3, the rear end of the second long extension pipe 12 ₃ The quick coupling 12a is also used for the part. Note that the quick coupling 12a of the rear end portion of the second long extension pipe 12 _3, a hose for supplying compressed air is connected from the compressor.

In this example, the total length measured along the axial direction D1 of the long main pipe 12 ₁ is about 5.5 m. Also, the total length measured along the first and second long extension pipe 12 ₂ and 12 ₃ in the axial direction D1 are equal to each other, is about 2.1 m. Moreover, the full length measured along the axial direction D1 of the lifting tool 16 is about 0.5 m.

Therefore, if the three tubes 12 ₁ , 12 ₂ and 12 ₃ are connected, the total length of the long tube 12 is about 10 m. Further, by connecting two tubes 12 ₁ and 12 _2, the total length of the long pipe is about 8m. In addition, when it is necessary to remove the clinker ash 110 existing at a distance exceeding 10 m from the manhole 106, three or more long extension pipes are connected, and the total length of the long pipe 12 exceeds 10 m. It's also good.

(Sheath tube)
The sheath tube 14 shown in FIG. 5C is configured as a rigid pipe that has an inner diameter larger than the outer diameter of the long tube 12 (including the quick coupling 12a) and is less bent. In this example, a carbon steel pipe for piping having a nominal diameter of 50 A is used as the sheath pipe 14. In order to suppress the total weight of the main body 10H, it is preferable to use a material having a light mass per unit length for the sheath tube 14 as long as the mechanical strength is the same.

The sheath tube 14 is configured to be split into two parts with respect to the axial direction D1. That is, the sheath tube 14, and a sheath main 14 ₁ and sheath extension pipe 14 _2. The connecting portion of the sheath main 14 ₁ and sheath extension pipe 14 _2, joint 14e is provided. The joint 14e is a so-called socket joint is configured as a large-diameter pipe slightly larger than the sheath extension pipe 14 ₂ provided at a rear end portion of the sheath main 14 _1. In this example, the total length measured along the axial direction D1 of the sheath main 14 ₁ is about 5.0 m. Also, the total length measured along the axial direction D1 of the sheath extension pipe 14 ₂ is about 2m.

Whether to use sheath extension pipe 14 ₂ is determined according to the entire length of the elongated tube 12. Specifically, when the entire length of the elongate tube 12 is 10m uses a sheath extension tube 14 _2. In contrast, when the total length of 8m uses only the sheath main 14 _1. By using a sheath extension pipe 14 ₂ Thus, removal device 10 can be kept appropriate amount of projection of the elongated tube 12 from the sheath tube 14.

  The sheath tube 14 is provided with a plurality of hanging tools for attaching the wires and chains of the support portion 18. In detail, the 1st hanger 14a, the 2nd hanger 14b, the 3rd hanger 14c, and the 4th hanger 14d are provided in the side surface of the sheath pipe 14 from the front-end | tip part side to the rear-end part side. Yes.

The first suspender 14a is O ring made of a rigid mounted near the distal end of the sheath main 14 _1. In this example, the first load block 14a is bolted to a nut that is fixed to the side surface of the sheath main 14 _1. The first suspender 14a, the wire 20 ₂ of the first support portion 20 is attached.

The second suspender 14b is provided in the vicinity of the intermediate portion along the axial direction D1 of the sheath main 14 _1. The second suspender 14b is configured similarly to the first hanger 14a, including the method of mounting the sheath main 14 _1. The second suspender 14b, wire 20 ₂ of the first support portion 20 is attached. The second hanger 14b plays an auxiliary role of the first hanger 14a. That is, by multiplying the wire 20 ₂ to the second load block 14b together with the first load block 14a, can be suppressed more effectively the deflection of the elongate tube 12 and the sheath pipe 14.

The third hanger 14c is provided with an O ring 14c-1 and 14c-2 manufactured by two rigid provided in the vicinity of the rear end portion of the sheath main 14 _1. These O rings 14c-1 and 14c-2 are provided symmetrically on the vertical line across the sheath main 14 _1. The individual O-rings 14c-1 and 14c-2 are configured in the same manner as the first hanging tool 14a. The O-ring 14c-1 is stretched from above by the chain of the support portion 18, and the O-ring 14c-2 is stretched from below by the chain of the support portion 18.

The fourth hanger 14d, except mounting position is near the sheath extension pipe 14 ₂ rear section, the same configuration as the third suspension link 14c, O ring 14d-1 and 14d-2 is also configured similarly ing.

(Hanging tool)
Next, with reference to FIG. 6, the suspension tool which crushes clinker ash is demonstrated. FIG. 6 (A) is a schematic view schematically showing the structure of kelen, which is one embodiment of a hanging tool, and FIG. 6 (B) is a diagram schematically showing the structure of a flux chipper, which is another embodiment of the hanging tool. It is a schematic diagram shown.

Chipping tool 16 is mounted via a quick coupling 12a to the end portion of the long main pipe 12 ₁ is a power tool for fishing operations.

  In this example, as shown in FIG. 6A, keren (for example, Nakatani Machinery Co., Ltd. model: NK1500), which is an air tool operated by compressed air, is used as the lifting tool 16. Keren includes a chisel 16a and a main body 16b. The chisel 16a is attached to the tip end side of the main body 16b. The chisel 16a vibrates at high speed in the vibration direction D1 when the main body 16b is operated, and crushes the clinker ash 110. In this example, the frequency of the chisel 16a is about 4000 times / minute. The chisel 16a will be described in detail in the next section.

The body portion 16b is an elongated main pipe 12 ₁ which also serves as a power transmission tube supplied with compressed air operating, vibrates the chisel 16a. In addition, since the structure of the main-body part 16b is conventionally well-known, further description is abbreviate | omitted.

  In this example, the case where keren is used as the lifting tool 16 has been described. However, a flux chipper (for example, Nakatani Machinery Co., Ltd. model: F2) shown in FIG. Similar to Keren, the flux chipper vibrates at high speed along the vibration direction D1 of the chisel 16a and can effectively crush the clinker ash 110.

  Further, as the lifting tool 16, an electric tool may be used. In this case, the power cable can be inserted into the long tube 12 to supply power to the electric tool.

(Tag)
Next, with reference to FIGS. 7-9, the chisel attached to a hanging tool is demonstrated. FIG. 7 (A) is a front view of the chisel of the first embodiment, and FIG. 7 (B) is a side view of the chisel of FIG. 7 (A). FIG. 8 (A) is a front view of the chisel of the second embodiment, and FIG. 8 (B) is a side view of the chisel of FIG. 8 (A). FIG. 9 is a front view of the chisel of the third aspect.

  First, with reference to FIG. 7A, a direction used for explanation of the chisel is defined. The first direction D2 is a direction perpendicular to the vibration direction D1. As shown by the arrow D2 in FIGS. 7 and 8, the first direction D2 is set parallel to the extending direction of the blade edge 50 of the chisel. In addition, a side view shows the structure of the chisel seen from the 1st direction D2.

  The second direction D3 is a direction perpendicular to both the vibration direction D1 and the first direction D2. 7 and 8, the second direction D3 corresponds to the thickness direction of the blade edge 50 of the flat chisel. In addition, a front view shows the structure of the chisel seen from the 2nd direction D3.

Figure 7 Referring to (A) and (B), will be described chisel 16a ₁ of the first embodiment. The chisel 16a ₁ is capable of crushing the clinker ash 110, but is preferably configured so as not to damage the heat transfer tube 112 of the secondary superheater 102b to which the clinker ash 110 is attached. Therefore, in the chisel 16a ₁ , the structure and material of the blade edge 50 are devised.

Specifically, the chisel 16a ₁ of the first aspect is a so-called flat chisel, and the blade edge 50 extends in parallel to the first direction D2. Then, both end portions 50E along the first direction D2 of the blade edge 50 are chamfered and rounded into a convex curved surface toward the outside of the blade edge 50. Further, as shown in FIG. 7B, the tip of the blade edge 50 is rounded into a convex curved surface toward the outside of the blade edge in the second direction D3. In this example, the material of the chisel 16a ₁ is unquenched mild steel. More specifically, S17C, which is a carbon steel for mechanical structure, is used. Thus, the clinker ash 110 can be effectively crushed while the corners of the cutting edge 50 are rounded and the above-mentioned materials are used as the material of the chisel 16a ₁ while preventing the heat transfer tube 112 from being damaged.

The material of the chisel 16a ₁ may be engineering plastics such as polyacetal, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, and polyphenylene sulfide. Here, the “engineering plastic” is a high-performance plastic having mechanical strength suitable for structural use and mechanical members and having a heat resistance of 100 ° C. or higher. By using engineering plastic as a material, it is possible to obtain a chisel having a practically sufficient clinker ash crushing capacity while preventing damage to the heat transfer tube 112.

Next, with reference to FIGS. 8 and 9, the chisel 16a ₂ and 16a ₃ of the second and third modes will be described.

As shown in FIGS. 8A and 8B, the chisel 16a ₂ of the second aspect is a so-called flat chisel, and the contour line of the blade edge 50 along the first direction D2 is formed in an arc shape. That is, the chisel 16a ₂ is formed in a substantially elliptical shape along the first direction D2. Further, as shown in FIG. 8B, the tip of the blade edge 50 is rounded into a curved surface convex toward the outside of the blade edge in the second direction D3. The chisel 16a ₂ of the second aspect can be formed of the same material as that of the first aspect 16a ₁ .

As shown in FIG. 9, the chisel 16a ₃ of the third aspect is a so-called straight chisel with a cutting edge 50 formed in a hemispherical shape. The chisel 16a ₃ of the third aspect can be formed of the same material as that of the first aspect 16a ₁ .

These three kinds of chiseles 16a ₁ , 16a ₂ and 16a ₃ having different shapes of the blade edge 50 have the following magnitude relationship with respect to the destructive force of the clinker ash 110.

First Aspect (16a ₁ )> Second Aspect (16a ₂ )> Third Aspect (16a ₃ )
As described above, even in the first mode chisel 16a ₁ , damage to the heat transfer tube 112 is sufficiently prevented in practical use. Therefore, in order to remove a large amount of clinker ash 110 in a short time, the first mode chisel 16a ₁ is preferably used. On the other hand, the chisel 16a ₂ and 16a ₃ of the second and third aspects can reduce the impact force applied to the heat transfer tube 112, and is therefore suitable for removing the clinker ash 110 adhering to the vicinity of the surface of the heat transfer tube 112.

(Support part)
Next, a support part is demonstrated with reference to FIG.10 and FIG.11. FIG. 10 is a schematic diagram schematically showing the configuration of the first support portion. FIG. 11 is a schematic diagram schematically showing the configuration of the second support portion. As already described, the support portion 18 includes first and second support portions 20 and 22 (see FIG. 4).

As shown in FIG. 10, the first support portion 20 includes a first hoisting machine 20 _1, the wire 20 _2, and a hanging bracket 20 _3.

The first hoisting machine 20 _1, the wire 20 ₂ are wound, can change the feed length of the wire 20 ₂ freely. In this example, the manual winch is used as the first hoist 20 _1.

Wire 20 _2, the first hoisting machine 20 _first free end of the opposite side, the first hanger 14a of the sheath tube 14 positioned into the furnace 102, are connected through a peephole 108. As a result, by changing the feeding length of the wire 20 _2, it can be moved freely body 10H in the vertical direction. Here, “moving freely in the vertical direction” means that the angle between the horizontal plane and the axial direction D1 can be freely changed, that is, it means that the main body 10H can be laid down or stood freely.

Hanging bracket 20 ₃ is fixed rigid steel O ring peephole 108. In this example, it is suspending fitting 20 ₃ is bolted to the outer wall surface of the furnace 102 of the periphery of the viewing opening 108, the wire 20 ₂ is inserted.

As shown in FIG. 11, the second support portion 22 includes a support frame 22 _1, and second and third winches 22 ₂ and 22 _3.

Supporting frame 22 ₁ is a frame body assembled rigid pipe made of a metal such as a ladder shape and is fixed to the manhole 106 shown by a dotted line in FIG. More specifically, the outer wall surface of the furnace 102 around the manhole 106 is used for fixing. The support frame 22 ₁ extends in the vertical direction and is arranged in parallel with each other, and the two vertical pipes 22 ₁ a and three horizontal pipes connecting the two vertical pipes 22 ₁ a in the horizontal direction. 22 ₁ b, 22 ₁ c and 22 ₁ d. A suspension fitting 22A, which is a rigid O-ring, is provided in the vicinity of the central portion in the horizontal direction of the uppermost horizontal pipe 22 ₁ b. Further, in the vicinity of the horizontal center portion of the lateral pipe 22 1 _d is located in the lowermost, hanging bracket 22B is provided as a rigid body made of O rings.

The second hoisting machine 22 ₂ in this example is used the lever block (registered trademark). The second hoisting machine 22 ₂ of one of the hooks are hung on the horizontal pipe 22 1 _b of the hanging metal fitting 22A is located in the uppermost. The other hook is hung on an O-ring 14d-1 (or an O-ring 14c-1) provided near the rear end of the sheath tube 14. The second hoisting machine 22 ₂ cooperates with the third hoist 22 _3, for stretching (supporting) the sleeve pipe 14 at a suitable tension of the chain.

Third hoist 22 _3, in this example used the lever block. One of the hooks of the third hoist 22 _3, are hung next to pipe 22 1 _d hanging bracket 22B which is located lowermost. The other hook is hung on an O-ring 14d-2 (or an O-ring 14c-2) provided near the rear end of the sheath tube 14. Third hoist 22 ₃ cooperates with ₂ second hoisting machine 22, for stretching (supporting) the sleeve pipe 14 at a suitable tension of the chain.

Second and third winches 22 ₂ and 22 ₃ are provided to sandwich the sheath tube 14 from the upper and lower vertical directions. Therefore, when winding up the both winches 22 ₂ and 22 ₃ of the chain, the sheath tube 14, as it were pulled from the vertical direction, a fourth sling 14d (or the third load block 14c) precession positions as fulcrums Supported for movement. Thus, the sheath tube 14, that is, the main body 10H, by stretching in the vertical direction by the second and third winches 22 ₂ and 22 _3, since undesired vibration in the horizontal direction of the main body 10H is suppressed, Positioning can be performed easily.

The second and third winches 22 ₂ and 22 ₃ in addition to the lever block, the chain block or the like, can be conventional other hoist.

  As described above, the removing device 10 of the present invention prevents the bending by configuring the main body 10H with the double tube of the sheath tube 14 and the long tube 12, and further, the front end portion and the rear end portion of the main body 10H. Are supported by the first and second support portions 20 and 22, respectively. As a result, the chisel 16a can be positioned at a desired position with an accuracy of about 10 cm, and the time required for removing the clinker ash 110 can be shortened.

  Further, by configuring the material of the chisel 16a and the shape of the blade edge 50 as described above, it is possible to crush only the clinker ash 110 without damaging the heat transfer tube 112.

(Removal method)
Next, the removal method of the present invention will be described with reference to FIGS. FIGS. 12A and 12B are schematic views sequentially showing the process steps of the removal method. FIGS. 13A and 13B sequentially show the process steps of the removal method following FIG. 12B. It is a schematic diagram shown. In addition, in FIG.12 and FIG.13, the removal apparatus 10 is shown simply.

  The removal method includes first to eighth steps. Hereinafter, these steps will be described in order.

<First step: FIG. 12A>
Figure 12 (A), in the first step, the wire 20 ₂ of the free end 20 ₂ f of the first support portion 20 inserted in the interior of the furnace 102 through the peephole 108, again the furnace from the manhole 106 Take it out of 102.

More specifically, the wire 20 ₂ of the free end 20 ₂ f, fed into the interior of the furnace 102 through the hanging bracket 20 ₃ peephole 108, the first hoist 20 _1, hanging free end 20 ₂ f is manhole 106 from until visible feed the wire 20 ₂ (see in the figure the white arrow Har1). Then, as shown by an arrow Ar1, this free end 20 ₂ f is pulled out of the furnace 102 from the manhole 106 by a hook or hand.

In the following description, (. Indicated by symbol HAr) white arrow used in the figure, the wire 20 shown ₂ and chain feeding and winding. A solid line arrow (indicated by symbol Ar) indicates the movement of the position of the component.

<Second to fifth steps: FIG. 12 (B)>
Subsequently, in the second step, a suspension tool 16 is attached to the distal end portion of the long tube 12, and the long tube 12 in that state is inserted into the sheath tube 14. In addition, the structure (refer a dotted line in the figure) which consists of the hanging tool 16, the long tube 12, and the sheath tube 14 is also called the main body 10H as described above.

Subsequently, in the third step, to secure the supporting frame 22 ₁ of the second support portion 22 to the manhole 106. Subsequently, in the fourth step, the free end 20 ₂ f taken out of the furnace 102 is connected to the first hanger 14a at the tip of the sheath tube 14 of the main body 10H. Now, the main body 10H is in a state in which near the tip portion is suspended by a wire 20 _2. In addition, the state which the 2nd-4th process was complete | finished is shown by FIG. 12 (B).

Next, in the fifth step, as shown in white arrow Har2, while feeding the wire 20 ₂ from the first hoist 20 _1, the main body 10H from the manhole 106, will push the interior of the furnace 102. That is, the operator feeding the wire 20 ₂ from the first hoist 20 _1, the feed amount by a length corresponding, as indicated by arrow Ar2 and Ar @ 3, continue to insert the main body 10H on the inside of the furnace 102 ( (Indicated by the dotted line in the figure).

<Sixth Step: FIGS. 13A and 13B>
In the sixth step, if the main body 10H is inserted to some extent inside the furnace 102, the second and third hoisting machines 22 ₂ and 22 ₃ are attached to the third hanger 14c provided at the rear end of the sheath tube 14. Install the chain.

In particular, the O ring 14c-1 of the sheath tube 14 over the hook of the second hoist 22 ₂ chain, multiplying the third hoist 22 ₃ chain hook O ring 14c-2. Thus, the rear end side of the main body 10H is the second and third winches 22 ₂ and 22 _3, is stretched from both upper and lower directions.

In this state, the wire 20 ₂ unwinding from the first hoisting machine 20 ₁ (white arrow HAr3), second and third winches 22 ₂ and 22 winding ₃ of the chain and a (white arrows HAr4 and HAr5) Synchronized. Then, the main body 10H is further inserted into the furnace 102 as indicated by an arrow Ar4.

Thus, while feeding the wire 20 _2, when winding the second and third winches 22 ₂ and 22 ₃ chain, eventually, the O ring 14c-1 and 14c-2 of the chains and sheath pipe 14, Series in a straight line along the vertical direction.

Thus, the second and third winches 22 ₂ and 22 ₃ in these conditions member arranged in a straight line, if you give an appropriate tension to the chain, the body 10H is the position of the third load block 14c, Supported by precession. That is, the setting of the removing device 10 is completed. FIG. 13B shows the state of the removal device 10 in this state.

<Seventh and eighth steps: FIG. 4>
In the seventh step, the chisel 16a is positioned. Specifically, feed amount of the first hoist 20 ₁ of the wire 20 ₂ by adjusting the height of the chisel 16a, and to adjust the horizontal position of the chisel 16a by moving the operating portion 10A in a horizontal direction, The chisel 16a is positioned.

  Then, in the eighth step, after positioning the chisel 16a, the long tube 12 is pushed forward in the axial direction D1 to contact the clinker ash 110, and the lifting tool 16 is operated to crush the clinker ash 110.

  Since the seventh and eighth steps have been described above with reference to FIG. 4, further description thereof is omitted.

  As described above, according to the removal method of the present invention, the removal device 10 can be set by a simple procedure. Therefore, the time required for the removal work of the clinker ash 110 including the setting can be shortened.

(How to extend the body)
Next, with reference to FIG.14 and FIG.15, the extension method of the main body in the removal apparatus in use, in detail, the extension method of a sheath tube and a long tube is demonstrated. 14 (A) and 14 (B) are schematic views sequentially showing process steps of a method for extending a sheath tube and a long tube. FIG. 15 is a schematic diagram showing process steps of a method for extending a sheath tube and a long tube following FIG. 14 (B). 14A to 15 are enlarged schematic views of the vicinity of the second support portion 22 in the removing device 10 in the use state shown in FIG. 13B.

  In order to extend the main body 10H and remove the clinker ash 110, the following ninth to twelfth steps are performed. Hereinafter, these steps will be described in order.

<Ninth step: FIG. 14A>
In a ninth step, the elongated tube 12, and more particularly to connect the second long extension pipe 12 ₃ to the rear end portion of the first long extension pipe 12 _2. In FIG. 14 (A), the already first and second long extension pipe 12 ₂ and 12 _3, and shows a state connected by quick coupling 12a.

Then, an arrow as shown by Ar5, while inserting connection a second long extension pipe 12 ₃ having undergone the internal sheath tube 14, the sheath extension pipe to the rear end portion of the sheath main 14 ₁ and more 14 ₂ is connected. Specifically, inserting the sheath extension tube 14 ₂ in the joint 14e.

<Tenth step: FIG. 14B>
In a tenth step, to bridge the upper hanging bracket 22A of the second support portion 22, the fourth hoist 22 ₄ chain between the O ring 14d-1 provided at the rear end of the sheath extension pipe 14 ₂ . Similarly, pass over a lower hanging bracket 22B of the second support portion 22, the fifth hoist 22 ₅ chain between the O ring 14d-2 which is provided at the rear end of the sheath extension tube 14 _2.

Thus, the upper hanging brackets 22A of the support frame 22 _1, in addition to the hoisting machine 22 ₂ existing second, fourth hoist 22 ₄ is fixed. Similarly, the lower hanging bracket 22B, in addition to the existing third hoist 22 _3, 5 hoisting machine 22 ₅ is fixed.

In this state, as shown in white arrow HAr6 and HAr7, it will loosen feeding the second and third winches 22 ₂ and 22 ₃ of the chain. As a result, the main body 10H is a fourth and fifth hoist 22 ₄ and 22 _5, a state of being supported by a wire 20 ₂ placed to the first load block 14a, the second and third winches 22 ₂ and 22 ₃ it is possible to remove the.

<11th step: FIG. 15>
In the eleventh step, suitably feed the wire 20 ₂ as shown in white arrow HAr10 from the first hoist 20 ₁ (not shown). Then, in accordance with the feeding amount of the wire 20 _2, winding the chain of the fourth and fifth hoist 22 ₄ and 22 ₅ (see the white arrows HAr8 and 9). As a result, the main body 10H is inserted at the rear end side of the hoisting machine 22 ₄ and 22 ₅ chain, and remains the leading end portion side is stretched respectively wires 20 _2, as indicated by arrow Ar5, gradually within the furnace 102 Is done. Note that FIG. 15 shows a state in which removal of the second and third winches 22 ₂ and 22 ₃ as described above.

  By performing the ninth to eleventh steps in this way, the entire length can be extended in use without removing the main body 10H from the support portion 18.

<Twelfth step: FIG. 4>
Finally, the clinker ash 110 is crushed using the extended main body 10H by performing the same operation as in the seventh and eighth steps.

  In this example, the case where the entire length of the main body 10H is extended from the short state to the long state has been described, but conversely, when the main body 10H is shortened from the long state to the short state, the reverse process is performed. Just do it.

  As described above, according to the removal method of the present invention, the entire length of the removal device 10 can be extended by a simple procedure while maintaining the use state. Therefore, the time required for the removal operation of the clinker ash 110 including the extension operation of the removal device 10 can be shortened.

  In addition, this extension operation is suitable, for example, when the removal of the clinker ash 110 in a range where the removal device 10 having a short overall length reaches is completed and the clinker ash 110 further distant is continuously removed.

10 Clinker ash removal device (removal device)
10A Operation unit 10H Main body 12 Long tube 12 ₁ Long main tube 12 ₂ First long extension tube 12 ₃ Second long extension tube 12a Quick coupling 14 Sheath tube 14 ₁ sheath main tube 14 ₂ sheath extension tube 14a 1 hanger 14b second load block 14c third load block 14c-1,14c-2,14d-1,14d- 2 O ring 14d fourth sling 14e joint 16 chipping tool _{16a, 16a 1, 16a 2,} 16a 3 The chisel 16b The main body part 18 The support part 20 The first support part 20 ₁ The first hoisting machine 20 _{2 The} wires 20 ₃ , 22A, 22B The hanging bracket 22 The second support part 22 _{1 The} support frame 22 ₁ a The vertical pipe 22 ₁ b, 22 ₁ c , 22 ₁ d Horizontal pipe 22 ₂ 2nd hoisting machine 22 ₃ 3rd hoisting machine 22 ₄ 4th hoisting machine 22 ₅ 5th hoisting machine 50 Cutting edge 50E End 100 Coal boiler (boiler)
102 furnace 102a coal burner 102b secondary superheater 102c tertiary superheater 102d quaternary superheater 102D lower region 102U upper region 104 rear heat transfer unit 106 manhole 108 peephole 110 clinker ash 112 heat transfer tube

Claims (14)

A long tube,
A sheath tube through which the long tube is movably inserted in the axial direction;
A clinker ash removal device comprising a hanging tool having a chisel attached to one end of the long tube ,
A first support part that supports the tip of the sheath tube on the side where the hanger tool is provided so as to be movable in the vertical direction;
A second support portion that supports the rear end portion of the sheath tube opposite to the side on which the lifting tool is provided, so that the sheath tube is capable of precessing;
With
The first support unit can freely change the length of the wire to be fed, and the coal boiler through a peephole that is fed from the first winder and provided above the manhole of the coal boiler. A wire for suspending the tip located inside,
A second hoisting machine, wherein the second support part is fixed to an upper hanging bracket of a vertical upper part of the support frame, which stretches the support frame made of a rigid body fixed to the manhole and the rear end part, respectively. A clinker ash removal apparatus, comprising: a third hoisting machine fixed to a lower hanging bracket of a lower part in the vertical direction of the support frame . When the direction perpendicular to the vibration direction of the chisel is the first direction, and the direction perpendicular to the vibration direction and the first direction is the second direction,
The chisel is a flat chisel whose cutting edge extends in parallel with the first direction, the cutting edge is formed as a curved surface with respect to the second direction, and both end portions along the first direction of the cutting edge are curved surfaces. The clinker ash removal device according to claim 1, wherein the clinker ash removal device is formed in a shape. When the direction perpendicular to the vibration direction of the chisel is the first direction, and the direction perpendicular to the vibration direction and the first direction is the second direction,
The said chisel is a flat chisel in which the contour line of the cutting edge along the first direction is formed in an arc shape, and the cutting edge is formed as a curved surface with respect to the second direction. The clinker ash removal apparatus described in 1.   The clinker ash removing apparatus according to claim 1, wherein the blade edge of the chisel is formed in a hemispherical shape.   The clinker ash removing device according to any one of claims 1 to 4, wherein the chisel is made of unquenched mild steel.   The clinker ash removing apparatus according to any one of claims 1 to 4, wherein the chisel is made of engineering plastic.   The clinker ash removal apparatus according to any one of claims 1 to 6, wherein the hanging tool is keren or a flux chipper.   The length along the axial direction of the said sheath pipe is shorter than the said elongate pipe, The clinker ash removal apparatus as described in any one of Claims 1-7 characterized by the above-mentioned.   The clinker ash removal device according to claim 8, wherein a difference in length between the sheath tube and the long tube is a value in a range of 2 to 3 m. The clinker ash removal device according to any one of claims 1 to 9, wherein the long tube is configured by two or more portions connected in the axial direction. The said clinker ash removal apparatus as described in any one of Claims 1-10 comprised by the 2 or more part connected to the axial direction.   The clinker ash removing apparatus according to any one of claims 1 to 11, wherein the long pipe also serves as a power transmission pipe for transmitting power to the lifting tool. With clinker ash removal device according to any one of claim 1 to 12, wherein the chisel is contacted clinker ash, clinker ash removal method characterized by crushing the clinker ash. Carried out using the clinker ash removal device according to any one of claims 1 to 12,
A first step of taking the free end of the wire of the first support portion inserted into the furnace of the coal boiler through the peep hole again out of the furnace from the manhole;
A second step of inserting the long tube in a state in which the lifting tool is attached to the distal end portion through the sheath tube;
A third step of fixing the support frame to the manhole;
A fourth step of connecting the free end taken out of the furnace in the first step to a distal end portion of the sheath tube in a state in which the long tube is inserted;
A fifth step of introducing the sheath tube into which the long tube is inserted from the manhole into the furnace while feeding the wire from the first hoisting machine;
In the fifth step, the rear end portion of the sheath tube introduced into the furnace in the state where the long tube is inserted is stretched by the second and third hoisting machines from both the upper and lower directions, respectively. A sixth step to hang,
The height of the chisel is adjusted according to the amount of feeding of the wire of the first hoisting machine, and the operation portion protruding from the manhole of the sheath tube and the long tube to the outside of the furnace is moved in the horizontal direction. A seventh step of adjusting the horizontal position of the chisel and positioning the chisel;
A clinker ash removal method comprising: an eighth step of bringing the chisel into contact with clinker ash and crushing the clinker ash.

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