Ash extrusion device

Abstract

To provide an ash extrusion device that reduces a moisture content of incineration ash and improves discharge performance of the incineration ash by using a simple structure and that enables reduction of production cost and maintenance cost.SOLUTION: An ash extrusion device 1 includes: a cooling tank 4 having an introduction port 2 to which incineration ash is introduced, a discharge port 3 for discharging the incineration ash cooled by storage water, and a first bottom plate 8A forming upward inclination from a lower side of the introduction port 2 toward the discharge port 3; a drive device 6 installed in a drive chamber 4a disposed on an opposite side of the discharge port 3 relative to the introduction port 2 and reciprocating a scraper 5 toward the discharge port 3; a chute 7 disposed on the outer side of the cooling tank 4 and at least including two side walls 7a connected to the discharge port 3 and opposing to each other; and a second bottom plate 16 supported between the two side walls 7a. The second bottom plate 16 is disposed continuously from the first bottom plate 8A on the outer side of the cooling tank 4 and on an extension line along the upward inclination.SELECTED DRAWING: Figure 1

Description

[Technical Field]

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

[0002] Incinerator plants are known as plants that incinerate waste and other materials. In an incinerator (e.g., a stoker furnace) within such a plant, ash (incinerator ash) generated by burning the materials is dropped from an ash chute through an inlet into an ash pusher, where it is cooled by stored water in a cooling tank of the ash pusher and then discharged from the outlet of the ash pusher to a conveying device. The ash pusher is equipped with a scraper (also called a "pusher") that pushes the ash cooled by the stored water toward the outlet. The scraper is driven by a drive unit to move back and forth between the forward direction toward the outlet and the reverse direction, pushing the ash from the stored water toward the outlet. When the ash is pushed out and discharged, it contains moisture.

[0003] The properties of incineration ash vary depending on the type of waste being incinerated. For example, some incineration ash is hard and easy to push out with a scraper, while other incineration ash is soft and difficult to push out with a scraper. Therefore, an ash pressurizing device was developed that compresses (compacts) the incineration ash to a hardness that makes it easy to push out with a scraper, thereby reducing the moisture content (Patent Document 1). This ash pressurizing device is equipped with a resistance plate that is supported so that it can swing freely via a horizontal pin that is perpendicular to the direction in which the incineration ash is pushed out, and the resistance plate pressurizes the incineration ash. The means for biasing the resistance plate can be the weight of the resistance plate itself, or a spring or cylinder device can be attached. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2000-55341 Summary of the Invention [Problem to be solved by the invention]

[0005] However, a structure in which a resistance plate is supported so as to be able to swing freely and pressurize the incineration ash, such as the ash pressurizing device in Patent Document 1, is not only expensive to install but also has the risk of increasing maintenance costs. In other words, an ash extrusion device that uses an ash pressurizing device with such a complex structure has the problem that an increase in various costs is unavoidable. The present invention has been made in consideration of the above-mentioned problems, and aims to provide an ash extrusion device that has a simple structure, can reduce the moisture content of incineration ash, improves the dischargeability of incineration ash, and can reduce manufacturing and maintenance costs, i.e., can improve cost-effectiveness. [Means for solving the problem]

[0006] The ash extrusion device of the present invention has an inlet through which incineration ash is introduced and a rectangular outlet through which the incineration ash cooled by stored water is discharged, and also has a cooling tank with a first bottom plate that slopes upward from below the inlet toward the outlet, a drive unit installed in a drive chamber located on the opposite side of the inlet from the outlet and that moves a scraper back and forth toward the outlet, a chute located outside the cooling tank and having at least two opposing side walls connected to the outlet, and a second bottom plate supported between the two side walls. The second bottom plate is disposed continuously from the first bottom plate outside the cooling tank and on an extension of the upward slope. [Effects of the Invention]

[0007] In the ash extrusion device of the present invention, the second bottom plate is disposed continuously on an extension of the first bottom plate, which slopes upward inside the cooling tank toward the discharge outlet, and is supported by at least two side walls of a chute disposed outside the cooling tank. In other words, the second bottom plate is disposed continuously outside the cooling tank along the slope of the first bottom plate, so that the first bottom plate is configured as if it were an extension outside the cooling tank. The extension, i.e., the installation of the second bottom plate, increases the drainage area for applying pressure to the incineration ash under its own weight to reduce its moisture content. As a result, the incineration ash near the scraper becomes harder, making it easier to push out with the scraper. In addition, the second bottom plate has a simple structure in which it is supported between both side walls of the chute and is arranged continuously from the first bottom plate, making it inexpensive and reducing the increase in installation and maintenance costs. Therefore, it is possible to provide an ash extrusion device that has a simple structure, can reduce the moisture content of incineration ash, improves the dischargeability of incineration ash, and reduces manufacturing and maintenance costs, i.e., an ash extrusion device that can improve cost-effectiveness. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view of the ash extrusion device according to the embodiment. [Figure 2] 2 is a cross-sectional view of the ash extrusion device of FIG. 1 taken along line AA. [Figure 3] 3 is a cross-sectional view of the ash extrusion device of FIG. 2 taken along line BB. [Figure 4] FIG. 2 is a perspective view of a first rail used in the ash extrusion device. [Figure 5] FIG. 10 is a cross-sectional view of a second rail in the ash extrusion device of the first modified example. [Figure 6] FIG. 10 is a perspective view of a metal fitting in the ash extrusion device of the second modified example. DETAILED DESCRIPTION OF THE INVENTION

[0009] An ash extrusion device according to an embodiment of the present invention will be described below with reference to the drawings. In Fig. 1, for ease of explanation, an orthogonal coordinate system with X, Y, and Z axes will be used as appropriate. The embodiments are merely illustrative and are not intended to exclude various modifications or applications of techniques not explicitly described. Except for the essential components of the present invention, each component of the embodiments can be selected or modified as necessary.

[0010] An ash push-out device 1 according to an embodiment will be described with reference to FIGS. 1 to 4. FIG. The ash extrusion device 1 has an inlet 2 through which incineration ash is introduced and a rectangular outlet 3 from which cooled incineration ash is discharged, and at least has a cooling tank 4 with a bottom plate 8A (first bottom plate) that slopes upward from below the inlet 2 toward the outlet 3, a drive unit 6 that is installed in a drive chamber 4a located on the opposite side of the inlet 2 from the outlet 3 and causes a scraper 5 to move back and forth toward the outlet 3, a chute 7 that is located outside the cooling tank 4 and has at least two opposing side walls 7a connected to the outlet 3, and a second bottom plate 16 that is supported between the two side walls. The second bottom plate 16 is disposed outside the cooling tank 4, continuously from the first bottom plate 8A, on an extension of the inclination of the first bottom plate 8A, which is disposed at an upward incline within the cooling tank 4. Conventionally, a draining area is formed only within the cooling tank, but in the ash extrusion device 1 of this embodiment, the second bottom plate 16 is disposed in this manner, so that the draining area 8d can be expanded to the outside of the cooling tank 4. The cooling tank 4, the driving device 6, the scraper 5, and the chute 7 that constitute the ash push-out device 1 will be described in this order below, and then the second bottom plate 16 will be described in detail.

[0011] First, the cooling tank 4 will be described. The inlet 2 of the cooling tank 4 is formed by a cylindrical (e.g., rectangular) wall 9. This cylindrical wall 9 is directly connected to an ash chute (not shown). The upper end of the ash chute is connected to an incinerator (not shown) (e.g., the post-combustion stage of a stoker furnace). Incineration ash generated in the incinerator is introduced into the cooling tank 4 through the inlet 2. In the cooling tank 4, water for cooling the incineration ash is stored at a standard water level (dashed line in Figure 1). In order to create a so-called "water seal" configuration, the lower end of the wall surface 9 is located below the standard water level of the stored water in the cooling tank 4.

[0012] The bottom plate 8 of the cooling tank 4 includes a first inclined surface 8a that slopes upward from directly below the inlet 2 toward the lower edge 3a of the rectangular outlet 3 (specifically, the vertically lower end of the outlet 3), and a second inclined surface 8b that slopes upward from directly below the inlet 2 toward the opposite side of the first inclined surface 8a. The part of the bottom plate 8 that forms the first inclined surface 8a is referred to as the "first bottom plate 8A." In the cooling tank 4, the bottom plate portion directly below the inlet 2 (hereinafter referred to as the "bottom surface 8c") is the lowest, and the bottom plate 8 has a downwardly convex curved shape. The cross-sectional shape of the cooling tank 4 is uniform in the width direction (Z-axis direction), and the width dimensions (dimensions in the Z-axis direction perpendicular to the plane of the paper in FIG. 1) of the first inclined surface 8a, the bottom surface 8c, and the second inclined surface 8b are all the same. In the cooling tank 4, on the opposite side of the inlet 2 from the outlet 3, a drive chamber 4a in which a drive device 6 is disposed is arranged.

[0013] Next, the driving device 6 and the scraper 5 will be described. The drive device 6 is a device that drives the scraper 5, and is disposed above the second inclined surface 8b in a position that is not submerged in the accumulated water (above the "reference water level"). The drive device 6 includes a drive shaft 6a that can rotate in two directions, and an arm 6b that connects the scraper 5 to the drive shaft 6a. The drive device 6 drives the arm 6b by rotating the drive shaft 6a, which in turn causes the scraper 5 connected to the arm 6b to move back and forth.

[0014] The scraper 5 is a device that pushes out the incineration ash cooled by the stored water toward the discharge outlet 3. The scraper 5 comprises an upper plate 5a facing upward, a push-out plate 5b facing the discharge outlet 3, and both side plates connected to the upper plate 5a and the push-out plate 5b (one of the both side plates, side plate 5c, is shown in Figure 1). Since there is no lower plate corresponding to the upper plate 5a, the scraper 5 has a box-like shape that is open to the bottom plate 8 of the cooling tank 4. When the arm 6b is driven, the scraper 5 moves forward and backward along the bottom plate 8 of the cooling tank 4 while the lower end of the push-out plate 5b (ie, the tip 5d of the scraper 5) is in contact with the bottom plate 8 over the entire width thereof. Here, the "forward movement" of the scraper 5 means that the scraper 5 moves in the direction (+X-axis direction in FIG. 1) that pushes the incineration ash toward the discharge port 3. Also, the "backward movement" of the scraper 5 means that the scraper 5 moves in the opposite direction to the "forward movement" (-X-axis direction in FIG. 1). Furthermore, the "total width" of the bottom plate 8 of the cooling tank 4 means the dimension in the width direction (Z-axis direction) inside the cooling tank 4.

[0015] The drive chamber 4a is equipped with a water level gauge 10 that detects the water level of the water stored in the cooling tank 4, and a supply pipe 11 that supplies water into the cooling tank 4 based on the water level detected by the water level gauge 10. Specifically, the water level gauge 10 and the supply pipe 11 are disposed in the drive chamber 4a, penetrating a drive chamber ceiling plate 12 that is disposed above the second inclined surface 8b and above the drive unit 6, and are fixed to the drive chamber ceiling plate 12. The water level meter 10 measures the level of the water stored in the cooling tank 4 and transmits the measurement data to the control device 14. The supply pipe 11 is connected to a water source (not shown), such as a water tank, and is provided with a nozzle 11a at its tip, which supplies (feeds) water to the cooling tank 4. The supply pipe 11 is provided with a solenoid valve 11b between the water source (not shown) and the nozzle 11a, and whether or not water is supplied from the supply pipe 11 is controlled by opening and closing the solenoid valve 11b.

[0016] The opening and closing of the solenoid valve 11b is controlled by the control device 14 based on the measurement data of the water level meter 10. For example, when the measurement data corresponds to a water level below a reference water level, the control device 14 opens the solenoid valve 11b and injects water from the supply pipe 11 into the cooling tank 4. When the measurement data corresponds to a water level equal to or higher than the reference water level, the control device 14 closes the solenoid valve 11b and stops the injection of water from the supply pipe 11 into the cooling tank 4. The drive chamber 4a is also provided with a drain pipe 13 for automatically draining the stored water when the water level exceeds the reference water level. The opening at the top end of the drain pipe 13 (overflow level) is located above the reference water level (for example, about 10 cm above the reference water level). This allows excess stored water to automatically overflow and be discharged from the drain pipe 13.

[0017] Next, the shoot 7 will be described. The chute 7 is disposed outside the cooling tank 4 and has at least two opposing side walls 7a connected to two side edges 3b in the width direction (Z-axis direction) of the rectangular discharge outlet 3. The distance between the two side walls 7a in the width direction (Z-axis direction) is preferably the same as the distance between the rectangular discharge outlet 3 in the width direction. When the second bottom plate 16 is not installed, the chute 7 guides the incineration ash from the discharge port 3 to the conveying device 15, and when the second bottom plate 16 is installed to expand the drainage area 8d, the chute 7 guides the incineration ash from the +X-axis direction of the second bottom plate 16 located furthest in the +X-axis direction within the chute 7 to the conveying device 15 so that the ash falls under its own weight to the conveying device 15. The conveying device 15 is a device that transports the discharged incineration ash to the outside of the ash extrusion device 1, and is, for example, a conveyor. In the ash extrusion device 1 of this embodiment, as shown in Figures 1 to 4, a single long first rail 17 is fixed to each of the two side walls 7a on an extension of the upward slope of a first bottom plate 8A that is arranged at an upward slope in the cooling tank 4. The first rail 17 may be welded to the side wall 7a or fastened to the side wall 7a with bolts and nuts. Since the first rail 17 is fixed on an extension of the upward slope, it is inclined so that it approaches the +Y-axis direction as it approaches the +X-axis direction.

[0018] Here, "on an extension line along the upward slope" does not only mean an extension line of the upward slope of the first bottom plate 8A arranged at an upward slope in the cooling tank 4, but also means that a slight difference in the inclination angle or a slight misalignment is acceptable as long as the extension line is "along" the upward slope. For example, although the first rail 17 needs to be inclined so that it approaches the +Y-axis direction as it approaches the +X-axis direction, the inclination angle may differ from the inclination angle of the first bottom plate 8A at the discharge port 3 depending on the design. Furthermore, there may be a misalignment such that the top surfaces of the first bottom plate 8A and the second bottom plate 16 are not flush with each other. Furthermore, the extension line may be not only straight but also curved, and therefore the first rail 17 may not only have a linear shape but also have a curved shape sufficient to support the second bottom plate 16. Even with these configurations, the drainage area 8d can be extended outside the cooling tank 4, so the moisture content of the incineration ash can be reduced by applying pressure under its own weight, and the hardness of the incineration ash near the scraper can be increased by applying pressure under its own weight, thereby facilitating the discharge of the incineration ash by the scraper. The support of the second bottom plate 16 by the first rail 17 will be described in detail later.

[0019] As described above, the chute 7 is required to have at least both side walls 7a. However, as shown in FIG. 1, the chute 7 may also have a top wall 7b connected to the upper edge of the rectangular discharge opening 3 and both side walls 7a and arranged on the XZ plane, a front wall 7c connected to the end of the top wall 7b closest to the +X axis direction and both side walls 7a, and a rear wall 7d connected to the lower edge 3a of the rectangular discharge opening 3 and both side walls 7a and arranged on the YZ plane. The top wall 7b, the two side walls 7a, the front wall 7c, and the rear wall 7d form a sealed cylindrical flow path for the incineration ash, with the discharge port 3 as an inlet and the opening 7e as an outlet. Because the flow path has a sealed cylindrical shape, it is possible to prevent the incineration ash from scattering outside the ash pusher 1.

[0020] Next, the second bottom plate 16 and the support of the second bottom plate 16 by the first rail 17 will be described in detail. As shown in FIG. 3, the second bottom plate 16 is rectangular and is preferably made of a metal with the same wear resistance as the bottom plate 8. The length of the long side of the second bottom plate 16 is the same as or slightly shorter than the widthwise (Z-axis) distance between the two side walls 7a of the chute 7. In consideration of ease of installation, the length of the short side of the second bottom plate 16 is preferably shorter than the long side, for example, 1 / 3 or less of the long side. In consideration of ease of installation and more delicate adjustment when extending the drainage area 8d, the length of the short side of the second bottom plate 16 may be approximately 1 / 20 to 1 / 10 of the long side. Here, the short side lengths of the multiple rectangular second bottom plates 16 provided are all described as being the same dimension, but multiple variations in short side length, such as L, 2L (twice L), and 3L (triple L), may be prepared in advance, and second bottom plates 16 with these different short side lengths may be mixed and placed on the first rail 17 as appropriate. This allows for more delicate adjustment when extending the drainage area 8d outside the cooling tank 4.

[0021] As shown in Fig. 4, first rail 17 is a long metal angle bar with an L-shaped cross section. First rail 17 has a vertical surface 17a that runs along side wall 7a and a mounting surface 17b that is substantially perpendicular to vertical surface 17a. Vertical surface 17a is a fixing surface for fixing first rail 17 to side wall 7a. Vertical surface 17a of first rail 17 and side wall 7a may be fastened together with bolts and nuts, or may be fixed by welding. The mounting surface 17b is a surface on which the second bottom plate 16 is placed and supports the second bottom plate 16. The mounting surface 17b is provided with a plurality of through holes 17c through which the bolts 18a are inserted to fasten the plurality of second bottom plates 16 with the bolts 18a and nuts 18b. However, only one through hole 17c is shown in Figure 4, and the others are omitted.

[0022] 3, similar through-holes are formed in second bottom plate 16 at positions corresponding to through-holes 17c of first rail 17, two at positions on side wall 7a on the +Z-axis direction side that rest on first rail 17, and two at positions on side wall 7a on the -Z-axis direction side that rest on first rail 17, a total of four positions, in other words, two at each end of second bottom plate 16 in the Z-axis direction. After aligning the through-holes 17c of second bottom plate 16 with those of first rail 17, bolts 18a are inserted and fastened with nuts 18b, whereby second bottom plate 16 is supported and fixed between two side walls 7a, as shown in FIG. When fixing multiple second bottom plates 16 to the first rails 17 of each of the two side walls 7a of the chute 7, as shown in Figure 3, the first bottom plate 8A and one second bottom plate 16 are fixed in contact with each other at the lower edge 3a of the discharge outlet 3 of the cooling tank 4, and then multiple second bottom plates 16 are fixed sequentially and continuously in the +X axis direction without any gaps. L-shaped metal angle bars are not only inexpensive, but also have a simple structure in which the second bottom plate 16 is placed and fixed on two first rails 17, which not only reduces manufacturing costs but also makes maintenance easy, thereby reducing maintenance costs.

[0023] The reason why second bottom plate 16 is fixed to mounting surface 17b of first rail 17 with bolts 18a and nuts 18b is to make second bottom plate 16 removable. This makes it possible to easily adjust the length of drainage area 8d when extending it outside cooling tank 4. The type of waste incinerated in an incinerator changes with the seasons, which can cause the properties of the incineration ash to vary with the seasons. Conventional ash extrusion devices have a fixed length for the drainage area, making it difficult to discharge the incineration ash. However, the ash extrusion device 1 of the embodiment can easily adjust and change the length of the drainage area 8d to an appropriate length depending on the season, reducing the moisture content of the incineration ash and providing excellent discharge performance for the incineration ash, regardless of the season.

[0024] 1 to 4, only one first rail 17 is fixed to one side wall 7a. However, as shown in FIG. 5, in the ash extrusion device 1′ of Modification 1, instead of the first rail 17, multiple second rails 17′, each shorter than the first rail 17 but with the same cross-sectional shape as the first rail 17, may be installed intermittently at intervals along the extension line along which the first rail 17 should be placed. Even if the second rails 17′ are arranged intermittently in this manner, it is sufficient that they can continuously support and secure the second bottom plate 16 without gaps, just like the first rail 17. The ash extrusion device 1′ of Modification 1 differs from the ash extrusion device 1 of the embodiment only in the configuration described here; otherwise, it is the same configuration as the ash extrusion device 1. Therefore, the same components as the ash extrusion device 1 are numbered the same as the ash extrusion device 1 and will not be described again. Furthermore, as in the ash extrusion device of Modified Example 2 shown in Figure 6, multiple metal fittings 17" that have the same cross-sectional shape as the second rail 17' but are even shorter than the second rail 17' may be installed intermittently at intervals. Even if the metal fittings 17" are arranged intermittently in this manner, it is sufficient that they can continuously support and fix the second bottom plate 16 without gaps, just like the first rail 17. The ash extrusion device of Modified Example 2 differs from the ash extrusion device 1' of Modified Example 1 only in the configuration described here, and the other configurations are the same as those of the ash extrusion device 1'. Therefore, as with Modified Example 1, the same configurations as those of the ash extrusion device 1 will be assigned the same numbers as those of the ash extrusion device 1 and will not be described again.

[0025] The above describes the ash extrusion device according to the embodiment, modification 1, and modification 2 of the present invention. However, these are merely examples, and as long as the second bottom plate 16 can be supported between the two side walls 7a, for example, the second rail 17′ and the metal fittings 17″ may be mixed and arranged on the side walls 7a. Also, for example, like garage shutters, a plurality of rectangular second bottom plates 16 may be stored below the bottom plate 8 of the cooling tank 4 in a state where they are flexibly connected to each other, and depending on the properties of the incineration ash, they may be slid out from the lower edge 3a of the discharge outlet 3, placed on the first rail 17, second rail 17' or metal fittings 17'', and supported between both side walls 7a of the chute 7. Furthermore, for example, the second bottom plate 16 may be configured as the bottom plate of a rectangular cylinder instead of the rectangular structure described above, and the rectangular cylinder may have a sliding structure that can be inserted and removed from the discharge port 3 of the cooling tank 4 depending on the properties of the incineration ash. In this case, the bottom plate of the rectangular cylinder is placed on the first rail 17, the second rail 17' or the metal fittings 17'', and is configured to be supported between the both side walls 7a of the chute 7. [Explanation of symbols]

[0026] 1, 1' Ash extrusion device 2. Introduction 3 outlet 3a lower edge 3b Side edge 4 Cooling tank 4a Drive compartment 5 scraper 5a Upper board 5b Extrusion plate 5c side plate 5d tip 6. Drive unit 6a Drive shaft 6b Arm 7 Shoot 7a side wall 7b Ceiling wall 7c front wall 7d back wall 7e aperture 8 Bottom plate 8a First slope 8b Second slope 8c Bottom surface 8d Draining area 8A First bottom plate (bottom plate 8 of first inclined surface 8a) 9 Wall 10 Water level gauge 11 Supply pipe 11a nozzle 11b Solenoid valve 12 Drive compartment ceiling panel 13 Drain pipe 14 Control device 15. Conveying equipment 16 Second bottom plate 17 First Rail 17a Elevation 17b Placement surface 17c through hole 17' Second Rail 17'' metal fittings 18a bolt 18b Nut

Claims

1. A cooling tank having an inlet for introducing incineration ash and a rectangular outlet for discharging the incineration ash cooled by stored water, and a first bottom plate that slopes upward from below the inlet toward the outlet; a drive device that is installed in a drive chamber that is arranged on the opposite side of the inlet from the discharge outlet and that reciprocates the scraper toward the discharge outlet; a chute disposed outside the cooling tank and having at least two opposing side walls connected to the discharge port; a second bottom plate supported between the two side walls; and The second bottom plate is an ash pushing device that is disposed continuously from the first bottom plate, outside the cooling tank and on an extension line along the upward slope.

2. A first rail is fixed to each of the two side walls on the extension line, or a plurality of second rails shorter than the first rail are intermittently fixed to each of the two side walls on the extension line, or a plurality of metal fittings are intermittently fixed to each of the two side walls on the extension line, The ash extrusion device according to claim 1, wherein the second bottom plate is supported between the two side walls by being placed on either the fixed first rail, the fixed second rail, or the fixed metal fitting.

3. The second bottom plate has a rectangular shape, The ash extrusion device of claim 2, wherein the length of the drainage area formed by the first bottom plate and the second bottom plate can be adjusted by selecting the number of second bottom plates placed and fixed on the first rail, the second rail, or the metal fittings.

4. The ash extrusion device of claim 3, wherein the first rail, the second rail, or the metal fitting has a substantially L-shaped cross section and has a vertical surface along the side wall and a mounting surface that is substantially perpendicular to the vertical surface, and the second bottom plate is mounted and fixed on the mounting surface.

5. Further, a conveying device is disposed below the discharge port, The ash extrusion device according to any one of claims 1 to 4, wherein the chute has a sealed cylindrical shape that guides the incineration ash from the discharge outlet to the conveying device.

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