Method of cleaning ash push-out device

Abstract

To provide a method of cleaning an ash push-out device, capable of efficiently and safely carrying out cleaning.SOLUTION: The method of cleaning an ash push-out device comprising a cooling tank provided with a discharge port discharging incineration ash cooled by stored water and a scraper pushing out incineration ash toward the discharge port, with the bottom face of the cooling tank comprising an inclined face inclined upward to the discharge port and the scraper being reciprocally moved forward and backward, comprises the steps of: discharging stored water from the cooling tank to move the scraper backward to the vicinity of the rear end of an inspection port; inserting a cleaning tool in contact with the bottom face across the entire width thereof from the inspection port provided on a first side wall, placing square bars shorter in the width direction than the cleaning tool between the cleaning tool and the scraper, and moving the scraper forward and stopping the scraper in the vicinity of the front end of the inspection port; inserting a jack between the end section of the nearest square bar and the first side wall to immobilize the square bar; subsequently moving the scraper backward to the vicinity of the rear end of the inspection port to lay additional square bars between the immobilized square bar and the scraper; and removing the jack to move the scraper forward.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a method for cleaning an ash extrusion device that cools and discharges incineration ash. [Background technology]

[0002] The ash pushing device is a device for introducing the incineration ash discharged from the incinerator into the cooling tank from an inlet, cooling it in the cooling tank, and discharging it from an outlet. Inside the cooling tank, a scraper is placed to push the incineration ash to the outlet. The scraper is placed so that its tip is in contact with the entire width of the bottom surface of the cooling tank, and is driven by a drive device placed on the opposite side of the inlet from the outlet. When the incinerator is shut down, cleaning work is performed to remove the incineration ash from the ash pushing device so that the incineration ash does not stick inside the ash pushing device.

[0003] During cleaning work, for example, a metal cleaning tool disclosed in Patent Document 1 can be used. In this case, the metal cleaning tool is placed at the front, and then, by sequentially adding square timber (wood), the incineration ash in the storage tank of the ash extrusion device can be discharged from the discharge port of the ash extrusion device by using the drive of the scraper (reciprocating motion back and forth). Patent Document 2 discloses a method of performing a similar operation by stacking square timber in two layers. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6823753 [Patent Document 2] Japanese Utility Model Application Publication No. 2-69226 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the case of an ash extrusion device, since there is an uphill slope from the inspection hatch (a.k.a. manhole) through which an operator can enter the inside of the device to the discharge outlet, if the scraper is pushed out toward the discharge outlet side by the scraper as in the cleaning methods described in these patent documents, there is a risk that the timbers will collapse when the scraper is then moved backwards. Once the timbers have collapsed, their positions must be corrected and they must be returned to their original state before they collapsed.

[0006] The present invention has been devised in consideration of the above-mentioned problems, and aims to provide a method for cleaning an ash extrusion device that allows cleaning work to be carried out efficiently and safely, whether the timbers are stacked in a single layer, arranged one above the other in a row along the upward slope, or in multiple layers, such as two layers above and one below. [Means for solving the problem]

[0007] The cleaning method of the ash push-out device of the present invention includes a cooling tank having an inlet consisting of a cylindrical wall surface into which incineration ash is introduced and an outlet for discharging the incineration ash cooled by stored water, a scraper arranged in the cooling tank, the tip of which contacts the entire width of the bottom surface of the cooling tank and pushes the incineration ash toward the outlet side, and a drive device arranged on the opposite side of the inlet from the outlet and for driving the scraper, the bottom surface of the cooling tank having a first inclined surface that slopes upward from directly below the inlet toward an open end where the outlet is formed, and a drive device for driving the scraper. The method for cleaning an ash extrusion device comprises a second inclined surface of the same width that slopes upward from directly below the inlet to the opposite side of the first inclined surface, the stored water is stored in the cooling tank at a predetermined water level that is above the lower end of the wall surface and below the outlet, the drive device has a drive shaft arranged above the second inclined surface, and the drive shaft rotates to cause the scraper to move back and forth along the bottom surface using an arm connected to the drive shaft and the scraper, and the method has at least the following steps. That is, the ash extrusion device has an access hole on a first side wall immediately below the inlet, the access hole having a front end close to the discharge port and a rear end located on the opposite side of the front end when viewed in the direction of the reciprocating motion of the scraper, and a first step of discharging the stored water from the cooling tank, moving the scraper backward to the vicinity of the rear end, and opening the access hole; a second step of inserting a metal cleaning tool that contacts the entire width of the bottom surface into the cooling tank through the access hole and placing one end of a block of wood that is shorter than the metal cleaning tool in contact with a second side wall that faces the first side wall at a position closer to the scraper than the metal cleaning tool in the cooling tank, and then moving the scraper forward and stopping it near the front end; a third step of inserting a portable jack between the other end of the nearest block pushed out to the vicinity of the front end by the advancement of the scraper and the first side wall, and extending the portable jack to fix the block between the first side wall and the second side wall; a fourth step of moving the scraper backward near the rear end after the fixing, and laying an additional block between the fixed block and the scraper in contact with the second side wall; and a fifth step of retracting the portable jack to release the fixation and removing the portable jack from the inspection hatch, and then moving the scraper forward and stopping it near the front end. Effect of the Invention

[0008] According to the cleaning method of the ash pusher of the present invention, the square timber placed between the metal cleaning tool and the scraper is pushed out toward the discharge port by the scraper together with the metal cleaning tool, and the nearest square timber is then fixed between the first and second side walls by the portable jack, so that the square timber remains fixed even after the scraper is moved backwards and the scraper no longer presses against the square timber. Therefore, the cleaning work of the ash pusher can be performed efficiently and safely. [Brief description of the drawings]

[0009] [Figure 1]FIG. 2 is a cross-sectional view of the ash push-out device for explaining the basic configuration of the ash push-out device to which the cleaning method of the present invention is applied and the first step of the cleaning method of the present invention. [Diagram 2] FIG. 2 is a perspective view showing an example of a metal cleaning tool used in the ash push-out device of FIG. 1. [Diagram 3] FIG. 4 is a cross-sectional view of the ash push-out device, illustrating a part of the second step of the cleaning method of the present invention. [Figure 4] FIG. 4 is a cross-sectional view of the ash push-out device, illustrating another part of the second step of the cleaning method of the present invention. [Diagram 5] FIG. 4 is a cross-sectional view of the ash push-out device, illustrating a part of the third step of the cleaning method of the present invention. [Figure 6] FIG. 4 is a cross-sectional view of an ash push-out device illustrating a part of a fourth step of the cleaning method of the present invention. [Figure 7] FIG. 11 is a cross-sectional view of the ash push-out device, illustrating another part of the fourth step of the cleaning method of the present invention. [Figure 8] FIG. 4 is a cross-sectional view of an ash push-out device illustrating a part of the fifth step of the cleaning method of the present invention. [Figure 9] FIG. 11 is a cross-sectional view of the ash extrusion device illustrating a part of the third step when the third step is repeated again after the fifth step. [Figure 10] FIG. 2 is a cross-sectional view of the ash push-out device illustrating the state at the end of cleaning work. [Figure 11] FIG. 2 is a cross-sectional view of an ash pushing device for explaining the cleaning method of the present invention when timber is stacked in multiple layers. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The cleaning method of the present invention will be described below with reference to a number of figures showing the states of the ash extrusion device corresponding to each step. For ease of explanation, each figure will be described using an orthogonal coordinate system with X, Y, and Z axes as appropriate. The embodiments described below are merely examples, and are not intended to exclude the application of various modifications and techniques not explicitly described in the embodiments. Each step of the cleaning method described in the embodiments can be modified in various ways without departing from the spirit of the method, except for essential steps.

[0011] Hereinafter, using Figures 1 and 2, we will first explain the basic configuration of an ash extrusion device to which the cleaning method of the present invention is applied, and an example of a metallic cleaning tool used in cleaning work, and then using Figures 3 to 10, we will explain each step of the cleaning method of the embodiment.

[0012] As shown in FIG. 1, an ash pusher 1 generally comprises a cooling tank 2 in which water for cooling incineration ash is stored up to a predetermined water level indicated by a two-dot chain line, a scraper 3 arranged in the cooling tank 2 and a drive unit 4 for driving the scraper 3, an inlet 5 through which incineration ash is introduced from an incinerator, and a discharge outlet 6 through which the incineration ash cooled in the cooling tank 2 is discharged by the scraper 3 and the drive unit 4. The inlet 5 of the cooling tank 2 is formed by a cylindrical (e.g., rectangular) wall. This wall is connected to an ash chute (not shown). The upper end of the ash chute is connected to the post-combustion stage of a stoker furnace, which is a waste incinerator, for example. The bottom surface 7 of the cooling tank 2 has a first inclined surface 7a that slopes upward from a lowest surface 7c, which is the lowest position in the bottom surface portion directly below the inlet 5, toward the outlet 6, and a second inclined surface 7b that slopes upward from the lowest surface 7c toward the opposite side of the first inclined surface 7a. That is, the first inclined surface 7a is formed so as to gradually become higher toward the forward direction Df (here, the +X-axis direction), and the second inclined surface 7b is formed so as to gradually become higher toward the backward direction Dr (here, the -X-axis direction). Therefore, the bottom surface 7 has a downwardly convex curved shape. The cross-sectional shape of the cooling tank 2 is uniform in the width direction (the direction perpendicular to the paper surface of FIG. 1, in this case the Y-axis direction), and the width dimensions of the first inclined surface 7a, the bottom surface 7c and the second inclined surface 7b are all the same.

[0013] The scraper 3 includes an upper plate 3a, a push-out plate 3b connected to the upper plate 3a and facing the discharge port 6, and both side plates (only one of the two side plates, 3c, is shown in FIG. 1) connected to the upper plate 3a and the push-out plate 3b. Since there is no bottom plate facing the upper plate 3a, the scraper 3 has a box shape that is open to the bottom surface 7 of the cooling tank 2. The scraper 3 is moved forward and backward by the drive unit 4 along the bottom surface 7 while the lower end of the push-out plate 3b (the tip 3d of the scraper 3) is in contact with the entire width of the bottom surface 7 of the cooling tank 2. The "forward movement" of the scraper 3 means that the pusher plate 3b of the scraper 3 pressurizes the incineration ash and moves in the pushing direction (forward movement direction Df, i.e., +X-axis direction) to push it toward the discharge port 6. The "backward movement" of the scraper 3 means that it moves in the opposite direction to the forward movement (backward movement direction Dr, i.e., -X-axis direction). The "total width" of the bottom surface 7 means the substantial size in the width direction (Y-axis direction) inside the cooling tank 2. Specifically, as shown in FIG. 5 described later, it means the distance between the two side walls 9 of the cooling tank 2, that is, the dimension between the side wall 9a (first side wall) and the side wall 9b (second side wall) or a dimension slightly smaller than that dimension.

[0014] The driving device 4 is a device that drives the scraper 3, and is disposed above the second inclined surface 7b. The driving device 4 includes a driving shaft 4a that can rotate in two directions, and an arm 4b that connects the scraper 3 and the driving shaft 4a. The driving device 4 can cause the scraper 3 connected to the arm 4b to move back and forth (forward and backward directions, ±X-axis directions) by rotating the driving shaft 4a.

[0015] Of the two side walls 9 of the cooling tank 2, a rectangular inspection hatch 8 (so-called manhole) is provided in the first side wall 9a near the bottom surface 7c, as shown by the dashed line in Fig. 1. The inspection hatch 8 is provided with a sealed door (not shown) that can be opened and closed by an operator. The inspection hatch 8 is formed large enough to allow at least a metal cleaning tool 10 (hereinafter simply referred to as "cleaning tool") to be described later to be brought in with ease. When viewed in the X-axis direction, the end of the inspection hatch 8 that is closer to the exhaust outlet 6 is referred to as the front end 8a. The opposite side to the front end, i.e., the end of the inspection hatch 8 that is closer to the drive unit 4, is referred to as the rear end 8b.

[0016] 2 is a front perspective view showing, as an example of a cleaning tool, a metal cleaning tool 10. Cleaning tool 10 is the cleaning tool described in Japanese Patent No. 6823753 (Patent Document 1) by the inventor of the present invention, and therefore a detailed description thereof will be omitted. The cleaning tool 10 can be separated into, for example, two blocks 10A and 10B, so that an operator can easily carry each of the separated blocks individually into the inside of the ash pushing device 1 through the inspection hatch 8 and assemble them into the cleaning tool 10. The width of the cleaning tool 10 is the overall width of the bottom surface 7. By combining the block 10A and the block 10B, the cleaning tool 10 can form a rectangular pushing plate of the overall width, and this pushing plate can push the incineration ash toward the discharge port 6. Here, the cleaning tool 10 is illustrated as being configured by integrating two blocks, but may be configured by integrating three or more blocks in line with the spirit of Japanese Patent No. 6823753. Furthermore, if the cleaning tool can be carried into the ash extrusion device 1 from the inspection hatch 8, it is not necessarily necessary to use the cleaning tool described in Japanese Patent No. 6823753 (Patent Document 1), and depending on the situation, a different cleaning tool, for example, a cleaning tool that is similar in shape to the cleaning tool described in Patent Document 1 but is integrally formed inseparably, may be used.

[0017] Now, with reference to Figures 3 to 11, we will sequentially explain each step of the cleaning method for discharging the incineration ash inside the above-mentioned ash pusher 1 from the discharge port 6. Note that Figures 3 to 11 are diagrams showing the same ash pusher 1 as Figure 1 at a certain point in time, so not all symbols are shown in all the figures, and in order to facilitate understanding, the symbols are omitted as appropriate.

[0018] [First step] In the first step, as shown in Fig. 1, with water (reserved water) stored in the cooling tank 2, the drive unit 4 is driven to make the scraper 3 move forward and backward in a reciprocating motion, pushing out as much incineration ash as possible toward the discharge outlet 6, and then the drive unit 4 is stopped. At this time, the drive unit 4 is stopped so that the tip 3d of the scraper 3 stops near the rear end 8b of the inspection hatch 8. Then, all the water stored in the cooling tank 2 is drained. There are various methods for draining the water. For example, the water may be drained by installing a drain valve (not shown) on the bottom surface 7 of the cooling tank 2. Alternatively, the water may be drained by inserting a hose into the cooling tank 2 from above the drive device 4 and driving a drain pump connected to the hose. The worker then opens the airtight door of the inspection hatch 8. In the following steps, when reference is made to the inspection hatch 8, it refers to the inspection hatch 8 with the sealed door open.

[0019] [Second process] After the first step, the worker inserts or carries the cleaning tool 10 into the cooling tank 2 through the access hole 8. Then, the worker places the cleaning tool 10 in the space between the push-out plate 3b of the scraper 3 and the incineration ash so that the cleaning tool 10 is in contact with the entire width of the bottom surface 7. Then, the worker inserts or carries a square piece of timber 11, the length of which is shorter than the width (Y-axis) length of the cleaning tool 10, into the interior of the cooling tank 2 through the inspection hatch 8, and places it in a position closer to the pusher plate 3b of the scraper 3 than the cleaning tool 10, in other words, in the -X-axis direction from the cleaning tool 10. 5, the square timber 11 is positioned so that one end 11a of the square timber 11 contacts the second side wall 9b that faces the first side wall 9a in which the inspection hatch 8 is installed. In other words, the other end 11b of the square timber 11 does not contact the first side wall 9a, and there is a space between the other end 11b and the first side wall 9a. As described above, Fig. 3 is a diagram showing the state in which the cleaning tool 10 and the block 11 are installed inside the cooling tank 2. Note that Figs. 3 to 11 show the ash push-out device 1 after the water has already been completely drained, and therefore there is no double-dashed line indicating a predetermined water level as in Fig. 1.

[0020] Thereafter, while looking inside the cooling tank 2 through the inspection hatch 8, the worker remotely operates the drive unit 4 to advance the scraper 3, and stops the scraper 3 when the tip 3d of the scraper 3 reaches the vicinity of the front end 8a of the inspection hatch 8, as shown in Fig. 4. By stopping the scraper 3 at this position, a gap can be provided between the pusher plate 3b of the scraper 3 and the front end 8a of the inspection hatch 8 that is at least large enough to allow the worker to insert their hands and arms, as shown in Fig. 4. In addition, the square timber 11 is positioned slightly further in the +X-axis direction than the front end 8a of the inspection hatch 8. At this time, the block 11 is sandwiched between the scraper 3 and the cleaning tool 10 and is fixed in place.

[0021] 3 and 4 show an example in which only one square timber 11 is disposed between the scraper 3 and the cleaning tool 10, but the same applies when multiple square timbers 11 are arranged in the X-axis direction. That is, the multiple square timbers 11 are sandwiched and fixed between the scraper 3 and the cleaning tool 10. Also, when multiple square timbers 11 are disposed, in the state in which the scraper 3 is advanced and stopped in the second step as in FIG. 4, the square timber 11 closest to the scraper 3 among the multiple square timbers 11, i.e., the square timber 11 that comes into direct contact when the scraper 3 moves toward the discharge port 6 (the square timber 11 located closest to the -X-axis direction), is located slightly further in the +X-axis direction than the front end 8a of the inspection hatch 8. Hereinafter, whether only one square timber 11 is placed between the scraper 3 and the cleaning tool 10 or multiple square timbers 11 are placed between the scraper 3 and the cleaning tool 10, the square timber 11 that comes into direct contact with the scraper 3 as it moves toward the discharge outlet 6, in other words, the square timber 11 that is closest to the -X-axis direction, will be simply referred to as the "nearest square timber."

[0022] [Third step] After the second step, the nearest beam 11 is, as described above, sandwiched and fixed between the scraper 3 and the cleaning tool 10. When multiple beams 11 are installed, not only the nearest beam 11 but also all the other beams 11 are sandwiched and fixed between the scraper 3 and the cleaning tool 10. Therefore, there is no risk of the beams 11 moving naturally. Therefore, in the third step, a worker inserts his hand or arm through the gap mentioned in the second step (the gap between the push-out plate 3b of the scraper 3 and the front end 8a of the inspection hatch 8) and inserts the portable jack 12 between the other end 11b of the nearest beam 11 inside the cooling tank 2 and the first side wall 9a, aligning it as shown in Fig. 5 (since Fig. 5 is a diagram of the alignment stage (before fixing), there is a space between the portable jack 12 and the other end 11b of the beam 11 and between the portable jack 12 and the first side wall 9a), and then extends the cylinder of the portable jack 12. This causes the nearest beam 11 to be firmly fixed between the first side wall 9a and the second side wall 9b. In the third step, the nearest beam 11 to be fixed by the portable jack 12 is positioned slightly in the +X-axis direction from the front end 8a of the inspection hatch 8, so that the worker can safely perform the work of aligning the portable jack 12 and fixing the nearest beam 11 by inserting only his or her hands and arms through the inspection hatch 8 rather than his or her entire body.

[0023] The portable jack 12 is a small jack, that is, a jack small enough that a single worker can simply and easily install it with one or both hands inside the cooling tank 2 of the ash extrusion device 1 through the gap between the extrusion plate 3b of the scraper 3 and the front end 8a of the inspection hatch 8. From the standpoint of load-bearing capacity, it is preferable that the portable jack 12 be a hydraulic cylinder type jack, but an air cylinder type jack may be used as long as it can sufficiently support and secure the square timber 11. In this embodiment, the portable jack 12 is described as a jack with an extendable cylinder, but the portable jack 12 may be a manual jack in which a pantograph or the like extends and retracts when a handle is rotated, as long as it can firmly secure the beam 11. That is, in the present invention, when the portable jack is extended, it means that the cylinder, pantograph, etc. are extended, and when the portable jack is retracted, it means that the cylinder, pantograph, etc. are retracted.

[0024] [Fourth step] After the nearest beam 11 is fixed in the third step, in the fourth step, the worker, while looking inside through the inspection hatch 8, remotely operates the drive unit 4 to move the scraper 3 backwards, and stops the scraper 3 when the tip 3d of the scraper 3 reaches the vicinity of the rear end 8b of the inspection hatch 8, as shown in Fig. 6. By stopping the scraper 3 at this position, a large space is created inside the cooling tank 2 between the front end 8a and the rear end 8b of the inspection hatch 8, allowing the worker to insert a new beam 11 (additional beam). 7, the worker then inserts a new square timber 11 (additional square timber) having substantially the same dimensions as the nearest square timber 11 between the nearest square timber 11 fixed by the portable jack 12 and the scraper 3 into the inside of the cooling tank 2 through the inspection hatch 8, and sequentially arranges them so that there are no large gaps on the bottom surface 7 of the cooling tank 2. In FIG. 7, three additional square timbers 11 are arranged side by side in the X-axis direction. When arranging these additional square timbers 11, they are arranged so that one end 11a of each square timber 11 contacts the second side wall 9b. In the fourth step, in the state shown in Fig. 6, the nearest beam 11 is firmly fixed by the portable jack 12, and the large space is obtained inside the cooling tank 2, so that when placing a new beam 11 as shown in Fig. 7, the worker can enter the cooling tank 2 with his / her whole body through the inspection hatch 8, or can place the new beam 11 by inserting only his / her hands or arms through the inspection hatch 8. In either case, the work of placing the new beam 11 inside the cooling tank 2 can be performed safely.

[0025] [Fifth step] In the fourth step, additional beams 11 are laid between the nearest beam 11 fixed by the portable jack 12 and the scraper 3, and then in the fifth step, the worker retracts the cylinder of the portable jack 12, releases the beam 11 fixed by the portable jack 12, and removes the portable jack 12 from the inspection hatch 8. At this time, since multiple pieces of timber 11 are laid out on the bottom surface 7 of the cooling tank 2 between the cleaning tool 10 and the scraper 3, these multiple pieces of timber 11 will not move naturally even if the portable jack 12 is removed. As described above, the square bars 11 are shorter than the length of the cleaning tool 10 in the width direction (Y-axis direction), and one end 11a of each square bar 11 is positioned so as to contact the second side wall 9b, so that there is a gap between the other end 11b of each square bar 11 and the first side wall 9a large enough for an operator to pass his or her hands or arms through (see Figure 5). Therefore, the worker can safely and easily remove the portable jack 12 by inserting only his / her hands and arms, rather than his / her entire body, through the inspection hatch 8, and take it out of the cooling tank 2 of the ash push-out device 1.

[0026] Thereafter, while looking inside the cooling tank 2 through the inspection hatch 8, the worker remotely operates the drive unit 4 to move the scraper 3 forward, and stops the scraper 3 when the tip 3d of the scraper 3 reaches the vicinity of the front end 8a of the inspection hatch 8, as shown in Figure 8. By stopping the scraper 3 in this position, a gap can be created between the push-out plate 3b of the scraper 3 and the front end 8a of the inspection hatch 8, at least large enough to allow an operator to insert their hands and arms, as shown in Figure 8. In addition, the square timber 11 closest to the scraper 3, i.e., the square timber 11 that comes into direct contact with the scraper 3 when it moves toward the discharge outlet 6 (the square timber 11 closest to the -X-axis direction), is located slightly further in the +X-axis direction than the front end 8a of the inspection hatch 8. Among the squared timbers 11 newly added in the fourth step, the squared timber 11 closest to the scraper 3 becomes the nearest squared timber 11 in FIG. 8 in the fifth step.

[0027] Thereafter, the third, fourth, and fifth steps are repeated in sequence multiple times in a circular manner. That is, as shown in FIG. 9, the third step is performed again to securely fix the nearest block 11 with the portable jack 12, and then the fourth step is performed again to move the scraper 3 backward, and when the tip 3d of the scraper 3 reaches the vicinity of the rear end 8b of the inspection hatch 8, the scraper 3 is stopped, and new additional blocks 11 are laid on the bottom surface 7 of the cooling tank 2. Then, the fifth step is performed again to remove the portable jack 12, move the scraper 3 forward, and stop the scraper 3 when the tip 3d of the scraper 3 reaches the vicinity of the front end 8a of the inspection hatch 8. In this manner, the third to fifth steps are repeated multiple times again.

[0028] When the fifth step is finally performed, the position of the cleaning tool 10 on the first inclined surface 7a is a short distance away from the discharge outlet 6. At this time, most of the incineration ash in the cooling tank 2 has already been discharged from the discharge outlet 6. Therefore, while looking at the discharge port 6 from outside the ash pusher 1, the worker remotely operates the drive unit 4 to advance the scraper 3 to an extent that the cleaning tool 10 does not fall from the discharge port 6, as shown in Figure 10, and stops the scraper 3 at a position where the cleaning tool 10 can be seen from the discharge port 6. This allows almost all of the incineration ash in the cooling tank 2 to be discharged from the discharge port 6, completing the cleaning work of discharging the incineration ash inside the ash pusher 1 from the discharge port 6. According to the above cleaning method, the cleaning work of the ash push-out device 1 can be carried out efficiently and safely. After completing the above cleaning work, the worker sequentially removes the cleaning tools 10 and the timber 11 from the discharge port 6 to the outside of the ash extrusion device 1, or sequentially removes the timber 11 and the cleaning tools 10 from the inspection hatch 8. Here, for example, even if the worker removes the timber 11 and the cleaning tools 10 from the inspection hatch 8, all of the incineration ash has already been discharged, and the weight of the incineration ash is not applied to the timber 11 and the cleaning tools 10, so they do not naturally move toward the inspection hatch 8. Therefore, the worker can safely remove the timber 11 and the cleaning tools 10 to the outside of the ash extrusion device 1.

[0029] In the above explanation, an example of a single-tier stack in which multiple timbers 11 are arranged one by one in the X-axis direction has been shown. However, in the case of a multi-tier stack in which timbers 11 are stacked on top of one another, in other words, in the case of a multi-tier stack (two tiers, three tiers, etc.) in which multiple timbers 11 are stacked in multiple tiers in the vertical direction, such as a two-tier stack in which multiple timbers 11 are arranged in two rows, one above the other, in the X-axis direction as shown in Fig. 11, the third to fifth steps are similarly performed in sequence multiple times after the first and second steps, thereby making it possible to efficiently and safely perform the cleaning work of discharging the incineration ash inside the ash pusher 1 from the discharge port 6. However, in the case of stacking in multiple tiers, (1) in the second step, multiple timbers 11 are stacked in multiple tiers in the vertical direction (Z-axis direction), (2) in the third step, the topmost timber 11 among the timbers 11 stacked in the vertical direction that comes into direct contact with the scraper 3 when it moves toward the discharge outlet 6 is treated as the "nearest timber," and as shown in Figure 11, the "nearest timber," which is the topmost timber 11, is fixed with a portable jack 12, and (3) in the fourth step, multiple additional timbers 11 are also stacked in multiple tiers in the vertical direction (Z-axis direction) and laid out. This is a significant difference from the single-tier stacking method described above. Furthermore, by firmly fixing the "nearest timber", which is the topmost timber 11, with a portable jack 12 in the same manner as in the case of a single tier stack, it is possible to prevent all of the timbers 11 from moving naturally even when the scraper 3 is reversed in the fourth step. In other words, although there are some differences between stacking the timber 11 in a single layer and stacking it in multiple layers, according to the present invention, in either case, the cleaning work of discharging the incineration ash from the ash extrusion device 1 can be carried out efficiently and safely. [Explanation of symbols]

[0030] 1 Ash extrusion device 2 Cooling tank 3 Scraper (3a top plate, 3b push plate, 3c side plate, 3d tip) 4 Drive unit (4a drive shaft, 4b arm) 5 Introduction 6 Outlet 7 Bottom surface (7a first slope, 7b second slope, 7c bottom surface) 8 Inspection hatch (8a: front end of inspection hatch, 8b: rear end of inspection hatch) 9 side walls (9a first side wall, 9b second side wall) 10 Cleaning equipment (10A first block, 10B second block) 11 Square timber (11a one end of the square timber, 11b the other end of the square timber) 12 Portable Jack Df forward direction Dr Reverse direction

Claims

1. A cooling tank having an inlet having a cylindrical wall surface into which incineration ash is introduced and an outlet for discharging the incineration ash cooled by stored water; A scraper is disposed in the cooling tank, the tip of which contacts the entire width of the bottom surface of the cooling tank and pushes the incineration ash toward the discharge port; a drive device disposed on the opposite side of the inlet from the outlet and configured to drive the scraper; The bottom surface of the cooling tank includes a first inclined surface that slopes upward from directly below the inlet toward an open end where the outlet is formed, and a second inclined surface that has the same width as the first inclined surface and slopes upward from directly below the inlet toward an opposite side of the first inclined surface, The stored water is stored in the cooling tank at a predetermined water level that is above the lower end of the wall surface and below the drain outlet, The driving device includes a driving shaft disposed above the second inclined surface, and the driving shaft rotates to cause an arm connected to the driving shaft and the scraper to move the scraper forward and backward along the bottom surface. The method for cleaning an ash pusher includes: The ash pusher has an access hole in a first side wall immediately below the inlet, the access hole having a front end close to the discharge port and a rear end opposite the front end when viewed in the direction of reciprocating motion of the scraper; a first step of discharging the stored water from the cooling tank, reversing the scraper to the vicinity of the rear end, and opening the inspection hatch; a second step of inserting a metal cleaning tool that contacts the entire width of the bottom surface into the cooling tank through the access hole and placing one end of a block of wood that is shorter than the metal cleaning tool in contact with a second side wall that faces the first side wall at a position closer to the scraper than the metal cleaning tool in the cooling tank, and then moving the scraper forward and stopping it near the front end; a third step of inserting a portable jack between the other end of the nearest block pushed out to the vicinity of the front end by the advancement of the scraper and the first side wall, and extending the portable jack to fix the block between the first side wall and the second side wall; a fourth step of moving the scraper backward near the rear end after the fixing, and laying an additional block between the fixed block and the scraper in contact with the second side wall; a fifth step of shortening the portable jack to release the fixing, removing the portable jack from the inspection hatch, and then moving the scraper forward and stopping it near the front end; A method for cleaning an ash extrusion device comprising:

2. 2. The method for cleaning an ash pusher according to claim 1, wherein the third step, the fourth step, and the fifth step are sequentially repeated until the metallic cleaning tool reaches the vicinity of the discharge port.

3. 3. The method for cleaning an ash extrusion device according to claim 2, wherein when the timbers are stacked vertically in multiple stages, the portable jack fixes the uppermost timber of the stacked timbers.

4. The method for cleaning an ash pusher device according to any one of claims 1 to 3, wherein the access hatch is rectangular.

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