Ash discharge device

Abstract

To provide an ash discharge device capable of discharging incineration ashes smoothly while suppressing an amount of water injected near a discharge port.SOLUTION: An ash discharge device has: a cooling tank 2 provided with an introduction port 6 of incineration ashes and a discharge port 7 of incineration ashes, a scraper 4 which is disposed in the cooling tank 2 and pushes the incineration ashes to the discharge port 7 side; and a driving device 5 which moves back and forth and drives a guide scraper 4 along a bottom plate. The bottom plate 8 of the cooling tank 2 is provided with: a first inclined plane 8a inclined upward to a discharge port 7 from right below the introduction port 6; and a second inclined plane 8b which inclines upward to an opposite side of the first inclined plane 8a from right below the introduction port 6. The storage water is stored in the cooling tank 2 at a prescribed water level above a lower end of the introduction port 6 and below the discharge port, is provided on both side walls of the first inclined plane 8a, has a water injection nozzle 16 jetting water to the side wall above the prescribed water level, and forms a water film on a contact surface between both side walls and the incineration ashes by water jet.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] Conventionally, incineration plants are known as plants that incinerate waste and other materials to be incinerated. In an incinerator (e.g., a stoker furnace) in this plant, ash (incinerator ash) generated by burning the materials to be incinerated is dropped from an ash chute to an ash pusher, cooled by stored water in the ash pusher, and then discharged from the ash pusher to a conveying device. The ash pusher is provided with a scraper (also called a "pusher") that pushes the incineration ash cooled by the stored water to a discharge outlet. The scraper reciprocates in a forward direction toward the discharge outlet and a backward direction opposite thereto, to push the incineration ash in the stored water to the discharge outlet.

[0003] However, in a typical ash extrusion device, the incineration ash cooled by the stored water inside the device is pushed up above a certain water level near the discharge outlet and drained off, which can cause the incineration ash to solidify and make it difficult to discharge from the discharge outlet. Therefore, a technology has been developed in which a water injection pipe is provided near the discharge outlet of the ash extrusion device, and water is sprayed from this water injection pipe near the discharge outlet to soften the solidified incineration ash and make it easier to discharge (see Patent Document 1). [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6752988 Summary of the Invention [Problem to be solved by the invention]

[0005] However, as in the technology described in Patent Document 1, spraying water over the entire surface of the incineration ash near the discharge port is effective in discharging the incineration ash, but the sprayed water flows into the storage tank of the ash extrusion device from the discharge port side toward the drive unit side. Since water is sprayed over the entire surface of the solidified incineration ash in order to soften the solidified incineration ash near the discharge port, the amount of water sprayed must be large. However, if the amount of water is too large, fine incineration ash mixed with the flow of water may get into the back side of the scraper and accumulate, hindering the operation of the scraper. The incineration ash that gets into the back side of the scraper and accumulates is called "return ash." In addition, although the ash extrusion device is a device that drains water and discharges incineration ash, it discharges incineration ash with a high moisture content, which results in a slight decrease in the quality of the discharged incineration ash. The present invention has been devised in consideration of such problems, and aims to provide an ash extrusion device that is configured to spray water near the discharge outlet, yet can smoothly discharge incineration ash using a smaller amount of water than conventional devices. [Means for solving the problem]

[0006] The ash pushing device of the present invention comprises a cooling tank having an inlet made 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 plate of the cooling tank and pushes the incineration ash toward the outlet, and a drive device arranged on the opposite side of the inlet from the outlet for driving the scraper. The bottom plate of the cooling tank has a first inclined surface that slopes upward from directly below the inlet toward the open end where the outlet is formed, and a front inclined surface that slopes upward from the open end where the outlet is formed. The ash extrusion device has a second inclined surface which is the same width as the first inclined surface and 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 which is above the lower end of the wall surface and below the outlet, the drive device has a drive shaft disposed above the second inclined surface, and the drive shaft rotates to cause the scraper to move forward and backward along the bottom plate using an arm connected to the drive shaft and the scraper, the ash extrusion device having the following configuration. That is, at least two water injection nozzles corresponding to the respective side walls are provided to inject water onto the side wall portions above the predetermined water level on both side walls of the first inclined surface while avoiding the incineration ash. The injection forms a water film between the both side walls and the incineration ash, facilitating the discharge of the incineration ash from the discharge port. Effect of the Invention

[0007] According to the ash pushing device of the present invention, water is injected from the water injection nozzles corresponding to each side surface to the side wall portion above a predetermined water level on both sides of the first inclined surface, avoiding the incineration ash. By injecting water from the water injection nozzles, a water film can be formed between the incineration ash on the first inclined surface and both sides of the first inclined surface, so that the incineration ash can be smoothly discharged from the discharge port of the ash pushing device. In addition, since the water is sprayed onto both side walls of the first inclined surface while avoiding the incineration ash, deterioration of the quality of the incineration ash can be avoided in terms of the moisture content of the incineration ash. Furthermore, the water is not sprayed onto the entire incineration ash near the discharge port, but onto a portion of both side walls of the first inclined surface, i.e., a portion of the side walls above a predetermined water level, so the amount of water can be reduced compared to the conventional method. This reduces the impact on the "return ash." [Brief description of the drawings]

[0008] [Figure 1] FIG. 2 is a cross-sectional view of the ash extrusion device according to the embodiment. [Diagram 2] FIG. 2 is a cross-sectional view taken along the line AA in FIG. [Diagram 3] FIG. 2 is a diagram showing the spray pattern of a water injection nozzle of the ash pusher of FIG. 1. [Figure 4] FIG. 11 is a cross-sectional view of an ash push-out device according to a first modified example. [Diagram 5] FIG. 11 is a cross-sectional view of an ash push-out device according to a second modified example. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Hereinafter, an embodiment of the ash extrusion device of the present invention and its modified examples (first modified example, second modified example) will be described with reference to the drawings. The embodiment and modified examples are merely examples, and are not intended to exclude the application of various modifications and techniques that are not explicitly stated. Except for the configurations essential to the present invention, each configuration of the embodiment and modified examples can be implemented in various modified forms, such as by selecting and discarding as necessary, or by appropriately combining one configuration with the other between the embodiment and the modified examples.

[0010] [Embodiment of ash extrusion device] First, an ash push-out device 1 according to an embodiment will be described with reference to FIG. The ash pushing device 1 is provided in an incinerator (e.g., a stoker furnace) and cools the incineration ash generated in the incinerator in a cooling tank 2 and then discharges it to a transport device 3 (e.g., a conveyor). The ash pushing device 1 has a cooling tank 2 in which stored water for cooling the incineration ash is stored, and a scraper 4 and a drive device 5 disposed in the cooling tank 2. The cooling tank 2 is provided with an inlet 6 through which the incineration ash is introduced and an outlet 7 through which the cooled incineration ash is discharged. The stored water and the liquid used for injection from the water injection nozzle 16 described below may be tap water, industrial water, or recycled water (water that has been used in a plant and then treated), or may be mixed water that has been neutralized by mixing with hydrochloric acid or the like. Hereinafter, these liquids used for the stored water will be described simply as "water."

[0011] The scraper 4 is a device that pushes out the cooled incineration ash toward the discharge port 7. The scraper 4 has an upper plate 4a facing upward, a push-out plate 4b facing the discharge port 7, and both side surfaces (not shown) connected to the upper plate 4a and the push-out plate 4b. Since there is no lower surface corresponding to the upper plate 4a, the scraper 4 has a box-like shape that opens to the bottom plate 8 of the cooling tank 2. The scraper 4 is connected to an arm 5b described below, and moves forward and backward along the bottom plate 8 of the cooling tank 2 while the lower end of the pusher plate 4b (i.e., the tip 4c of the scraper 4) is in contact with the bottom plate 8 over the entire width thereof. In this case, the "forward movement" of the scraper 4 means that the scraper 4 moves in the direction pushing out the incineration ash toward the discharge port 7 (leftward in FIG. 1, forward direction Df). Also, the "reverse movement" of the scraper 4 means that the scraper 4 moves in the opposite direction to the "forward movement" (the direction in which the scraper 4 returns, rightward in FIG. 1, backward direction Dr). Furthermore, the "total width" of the bottom plate 8 of the cooling tank 2 means the dimension in the width direction inside the cooling tank 2 (the direction perpendicular to the paper surface of FIG. 1).

[0012] The driving device 5 is a device that drives the scraper 4, and is disposed on the opposite side of the discharge port 7 with respect to the inlet 6 (the right side in FIG. 1). The driving device 5 includes a driving shaft 5a that is disposed above a second inclined surface 8b described below and is rotatable in two directions, and an arm 5b that connects the scraper 4 and the driving shaft 5a. The driving device 5 drives the arm 5b by rotating the driving shaft 5a, and as a result, the scraper 4 connected to the arm 5b reciprocates forward and backward.

[0013] The inlet 6 of the cooling tank 2 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 (e.g., the post-combustion stage of a stoker furnace) (not shown). In order to achieve a so-called "water seal" configuration, the lower end of the wall surface 9 is positioned below a predetermined water level of the stored water in the cooling tank 2 (the dashed line in FIG. 1).

[0014] The bottom plate 8 of the cooling tank 2 has a first inclined surface 8a that slopes upward from directly below the inlet 6 toward the outlet 7 (specifically, the opening end 7a, which is the vertically lower end of the outlet 7), and a second inclined surface 8b that slopes upward from directly below the inlet 6 toward the opposite side of the first inclined surface 8a. That is, the first inclined surface 8a is formed so as to gradually become higher in the forward direction Df, and the second inclined surface 8b is formed so as to gradually become higher in the reverse direction Dr. In the cooling tank 2, the inner surface of the bottom plate directly below the inlet 6 (hereinafter referred to as the "lowermost surface 8c") is the lowest, and the bottom plate 8 has a downwardly convex curved shape. The cross-sectional shape of the cooling tank 2 is uniform in the width direction, and the width dimensions (dimensions in the direction perpendicular to the paper surface of FIG. 1) of the first inclined surface 8a, the lowermost surface 8c, and the second inclined surface 8b are all the same.

[0015] The ash extrusion device 1 is equipped with a water level gauge 10 that detects the water level of the stored water in the cooling tank 2, and a water injection pipe 11 that increases the amount of water stored in the cooling tank 2 based on the water level detected by the water level gauge 10. The water injection pipe 11 is connected to a water source (first water source) not shown, such as a water storage tank. The water level gauge 10 is positioned above the second inclined surface 8b, between the rear end of the scraper 4 when the scraper 4 has moved all the way back and the rear wall 9R (the wall 9 on the second inclined surface 8b side of the two wall surfaces 9 arranged in the direction of the reciprocating motion of the scraper 4).

[0016] The water injection pipe 11 is desirably disposed at a position above the second inclined surface 8b and close to the water level gauge 10. For example, the water injection pipe 11 is disposed on the forward direction Df side of the rear end of the scraper 4 when the scraper 4 is moved most backward. By arranging the water injection pipe 11 in this manner, the water level gauge 10 can be cleaned by injecting liquid from the water injection pipe 11, thereby improving the sensitivity of the water level gauge 10. In addition, since the water injection pipe 11 can inject water from a position close to the inlet 6, the water level of the stored water on the first inclined surface 8a can be quickly increased as necessary.

[0017] The drive shaft 5a of the drive unit 5 is disposed above the second inclined surface 8b but at a position not submerged in the stored water (i.e., above the predetermined water level). For water sealing, the predetermined water level of the stored water is set above the lower end of the wall surface 9 and below the opening end 7a of the drain port 7. The amount of stored water in the cooling tank 2 is adjusted by the control device 12 and the drain pipe 13 so as to be maintained at this predetermined water level. Specifically, first, the cooling tank 2 is provided with a drain pipe 13 for draining the stored water when the water level exceeds a predetermined water level. The opening at the upper end of the drain pipe 13 is located above and near the predetermined water level. This allows excess stored water to automatically overflow and be discharged from the drain pipe 13 without valve control. The control device 12 controls the opening and closing of an electromagnetic valve 14 installed in the middle of the water injection pipe 11 based on the water level detected by the water level gauge 10 (for example, the actual water level that is the actual water level of the stored water stored in the cooling tank 2). In other words, the control device 12 receives the measurement result of the water level gauge 10, and when the water level of the stored water is lower than a predetermined water level, the control device 12 opens the electromagnetic valve 14 to inject water from the water injection pipe 11 into the cooling tank 2. When the measurement result is equal to or higher than the predetermined water level, the control device 12 closes the electromagnetic valve 14 to stop the injection of water into the cooling tank 2.

[0018] In addition to the above configuration, as shown in Figures 1 and 2, the ash extrusion device 1 has water injection nozzles 16 (16a, 16b) for injecting water onto the wall surfaces of the side walls 15a, 15b, which extend upward from both side ends of the first inclined surface 8a, in the portion above a predetermined water level, while avoiding direct impact of water on the incineration ash on the first inclined surface 8a. As shown in FIG. 2, two water injection nozzles 16 are provided symmetrically, one on side wall 15a near the discharge port 7 and the other on a side wall 15b near the discharge port 7 different from side wall 15a. Here, one water jet nozzle 16 is disposed on each of the two side walls 15a, 15b, but two or more water jet nozzles 16 may be disposed on each side wall depending on the design.

[0019] As described above, in order to prevent the water sprayed from the water spray nozzle 16 from directly hitting the incineration ash as much as possible, it is desirable to use a fan-shaped nozzle as the water spray nozzle 16. When water is sprayed from a fan-shaped nozzle, the sprayed water forms a linear spray pattern (approximately planar when viewed three-dimensionally) as shown in Figure 3. The water injection nozzles 16 are installed so that the spray pattern of the water injected onto the corresponding side wall is linear (approximately planar) from the upstream side to the downstream side (from the scraper 4 side to the discharge port 7 side) in the direction of travel of the incineration ash, as shown in Fig. 3. By making the spray pattern linear, it becomes easy to install the water injection nozzles 16 so that the water injected from the water injection nozzles 16 does not directly hit the incineration ash. 2, when the cooling water tank 2 is viewed from the outlet 7 side, the water injection nozzles 16 (16a, 16b) are installed so as to inject water obliquely downward toward the corresponding side wall. In other words, the water injection nozzle 16a corresponding to the side wall 15a is installed so as to inject water obliquely from above toward the wall surface of the side wall 15a, that is, obliquely toward the lower left in FIG. 2. The water injection nozzle 16b corresponding to the side wall 15b is installed so as to inject water obliquely from above toward the wall surface of the side wall 15b, that is, obliquely toward the lower right in FIG. 2.

[0020] A branch pipe 17 is connected between the water injection pipe 11 at a location downstream of the electromagnetic valve 14 and each water injection nozzle 16 (16a, 16b). When the water level of the stored water is lower than a predetermined water level, the control device 12 controls the electromagnetic valve 14 to open, so that water flows through the inside of the branch pipe 17 and the water is injected from each water injection nozzle 16 in the spray pattern described above. In this case, when the electromagnetic valve 14 is opened by the control device 12 as described above, water is also injected from the water injection pipe 11 into the cooling tank 2 at the same time. In this way, the water injection and the injection can be performed simultaneously by simply opening one electromagnetic valve 14, so that the manufacturing cost of the ash pusher 1 can be reduced. Here, the total amount of water injected from each water injection nozzle 16 is significantly less than the total amount of water injected directly from the water injection pipe 11 into the cooling tank 2, and the pipe diameters of the water injection pipe 11 and the branch pipe 17 and the size of the water injection nozzle 16 are appropriately selected so that the ratio is about 1:10. By setting the ratio at this level, it is possible to almost completely eliminate the effect on the generation of "return ash" caused by the water flowing inside the cooling tank 2 from the first inclined surface 8a toward the second inclined surface 8b.

[0021] The water jetted from each water jet nozzle 16 does not hit the incineration ash directly, but hits the corresponding wall surface directly, flows downward along the wall surface, and forms a water film between the wall surface and the incineration ash. That is, the water film penetrates into the boundary between the incineration ash and the side wall 15a and between the incineration ash and the side wall 15b, and humidifies only the part of the incineration ash that comes into contact with the water film. This water film facilitates the discharge of the incineration ash from the discharge port 7, and promotes the discharge of the incineration ash from the discharge port 7. In addition, the water injection nozzle 16 injects water partially above the predetermined water level and against the corresponding side wall so as not to directly hit the incineration ash. Therefore, of the incineration ash piled up on the first inclined surface 8a, the incineration ash that is pushed up above the predetermined water level and drained is only humidified in a part that contacts the water film. Therefore, when looking at the entire incineration ash discharged, in the ash extrusion device 1 of the embodiment, the increase in the moisture content of the incineration ash discharged from the discharge port 7 is significantly smaller than in the conventional technology in which water is injected to humidify the entire incineration ash near the discharge port, and deterioration in the quality of the incineration ash can be avoided.

[0022] [Ash extrusion device of the first modified example] Next, the ash push-out device 1A of the first modified example will be described with reference to FIG. The main differences between the ash extrusion device 1A of the first variant and the ash extrusion device 1 of the embodiment are that the ash extrusion device 1A of the first variant does not have the branch pipe 17 arranged in the ash extrusion device 1 of the embodiment, and therefore a water supply pipe 18 is connected to the water injection nozzle 16 instead of the branch pipe 17, that the control device 12A controls the opening and closing of the solenoid valve 14A (second solenoid valve) interposed in the middle of the water supply pipe 18, and that the control device 12A can control the solenoid valve 14 (first solenoid valve) and the solenoid valve 14A (second solenoid valve) separately and independently. In the following description, the same elements as those in the ash push-out device 1 of the embodiment are given the same reference numerals, and duplicated descriptions will be omitted.

[0023] First, the water supply pipe 18 for supplying water to the water injection nozzle 16 is connected to a water source (second water source) not shown, such as a water tank. This water source may be the same as the water source (first water source) for supplying water to the water injection pipe 11, or may be different, depending on the design. When the first water source and the second water source are different, the types of water in the first water source and the second water source may be different, and the water in the second water source may be, for example, a chemical solution, which improves the slipperiness of the water film and promotes the discharge of incineration ash from the discharge port 7.

[0024] The control device 12A performs the control in the control device 12 and also controls the opening and closing of the electromagnetic valve 14A (second electromagnetic valve). Therefore, the control device 12A receives the measurement result of the water level gauge 10, and if the water level of the stored water is lower than a predetermined water level, the control device 12A opens the electromagnetic valve 14 to inject water from the water injection pipe 11 into the cooling tank 2. If the measurement result is equal to or higher than the predetermined water level, the control device 12A closes the electromagnetic valve 14 to stop the injection of water into the cooling tank 2. In addition, the control device 12A opens the electromagnetic valve 14A (second electromagnetic valve) periodically at a predetermined time interval and intermittently at a predetermined time. For example, the control device 12A opens the electromagnetic valve 14A (second electromagnetic valve) for only one minute periodically at a 10-minute interval, and intermittently sprays water from the water spray nozzles 16 (16a, 16b). Regardless of whether the level of the stored water is lower than a predetermined level or not, the control device 12A periodically and intermittently opens the electromagnetic valve 14A (second electromagnetic valve) to inject water from the water injection nozzle 16, so that even if the level of the stored water does not frequently fall below the predetermined level, a water film can be reliably formed and maintained, and the incineration ash can be smoothly discharged from the discharge port 7. In this respect, the ash pusher 1A of the first modified example is superior to the ash pusher 1 of the embodiment.

[0025] In the first modified ash extrusion device 1A, the ratio between the total amount of water sprayed from each water injection nozzle 16 (16a, 16b) and the amount of water injected into the cooling tank 2 from the water injection pipe 11 is set to approximately 1:10, as in the ash extrusion device 1 of the embodiment. In the ash pusher 1 of the embodiment, the ratio is achieved by appropriately selecting, for example, the pipe diameters of the water injection pipe 11 and the branch pipe 17 or the size of the water injection nozzle 16, but in the ash pusher 1A of the first modified example, it is not necessarily necessary to realize the ratio by such selection. For example, the amount of water injected from each water injection nozzle 16 can be set to the above ratio by adjusting the opening time of the electromagnetic valve 14A (second electromagnetic valve).

[0026] [Ash extrusion device of the second modified example] Next, an ash push-out device 1B of a second modified example will be described with reference to FIG. The main differences between the ash extrusion device 1B of the second variant and the ash extrusion device 1A of the first variant are that the ash extrusion device 1B of the second variant is, in addition to the configuration of the ash extrusion device 1A of the first variant, a water injection port 19 that injects water also onto the first inclined surface 8a, that the control device 12B controls the opening and closing of the solenoid valve 14B (third solenoid valve) installed midway through the water supply pipe 18A connected to the water injection port 19, and that the control device 12B can separately and independently control the solenoid valve 14 (first solenoid valve), solenoid valve 14A (second solenoid valve), and solenoid valve 14B (third solenoid valve).

[0027] Although the description of the ash extrusion device 1 of the embodiment and the ash extrusion device 1A of the first modification has been omitted, including the ash extrusion device 1B of the second modification, the bottom plate 8 of these ash extrusion devices is integrally provided with a plurality of scaly or sawtooth liner plates 20. Therefore, the first inclined surface 8a is the surface of the liner plate 20, and the incineration ash comes into contact with this surface. 5, the first inclined surface 8a is a surface with scale-like or sawtooth-like steps (convex portions). When multiple liner plates 20 are installed on the bottom plate 8 that is inclined obliquely upward toward the discharge outlet 7 side, the end portion (front end portion 20a of the liner plate 20) of one liner plate 20 on the discharge outlet 7 side end portion (rear end portion 20b of the liner plate 20) of another liner plate 20 one plate ahead of it (the forward direction Df side or the discharge outlet 7 side) is overlapped and fixed on the scraper 4 side end portion (rear end portion 20b of the liner plate 20) of the other liner plate 20, thereby forming a scale-like or sawtooth-like surface. On the first inclined surface 8a thus formed, multiple convex portions are formed like sawtooth by the respective tip portions 20a of the multiple liner plates 20. These convex portions have the function of preventing the incineration ash on the first inclined surface 8a from sliding down from the discharge port 7 side to the scraper 4 side.

[0028] Then, of these multiple protrusions, a water ejection port 19 is formed on a surface (the tip surface 20c of the liner plate 20) facing the discharge port 7 of a protrusion appropriately selected according to design. The water injection port 19 can be formed by embedding a fan-shaped nozzle similar to the water injection nozzle 16 described above in the convex portion, or by drilling a hole in the convex portion. The water injection port 19 may be installed evenly in the width direction (direction perpendicular to the paper surface of FIG. 5) on the first inclined surface 8a above the predetermined water level. The water injection port 19 may be installed on each of the tip surfaces 20c of the multiple liner plates 20 that are stacked and fixed toward the discharge port 7. The water injection port 19 may be installed on the first inclined surface 8a below the predetermined water level. It is preferable that the water injection port 19 injects water in a linear spray pattern along the contact surface between the liner plate 20 and the incineration ash. In addition, since the water injection port 19 opens obliquely upward, the water pressure of the water injected from the water injection port 19 is set high to prevent the opening from being blocked by incineration ash, thereby preventing clogging. A water supply pipe 18A for supplying water to the water jet port 19 is connected to the water jet port 19 by drilling a hole in the liner plate 20 and the bottom plate 8. An electromagnetic valve 14B (third electromagnetic valve) is interposed midway in the water supply pipe 18A.

[0029] The control device 12B performs opening and closing control of an electromagnetic valve 14B (a third electromagnetic valve) in addition to the control in the control device 12A. Therefore, the control device 12B receives the measurement result of the water level gauge 10, and if the water level of the stored water is lower than a predetermined water level, the control device 12B opens the electromagnetic valve 14 to inject water from the water injection pipe 11 into the cooling tank 2. If the measurement result is equal to or higher than the predetermined water level, the control device 12B closes the electromagnetic valve 14 to stop the injection of water into the cooling tank 2. In addition, the control device 12B opens the electromagnetic valve 14A (second electromagnetic valve) periodically at a predetermined time interval and intermittently at a predetermined time. For example, the control device 12B opens the electromagnetic valve 14A (second electromagnetic valve) for only one minute periodically at a 10-minute interval, and intermittently sprays water from the water spray nozzle 16. Furthermore, the control device 12B opens the electromagnetic valve 14B (third electromagnetic valve) periodically at a predetermined time interval and intermittently at a predetermined time to spray water from the water spray port 19 in the convex portion of the liner plate 20. For example, the control device 12B opens the electromagnetic valve 14B (third electromagnetic valve) for only 30 seconds periodically at 15-minute intervals to spray water from the water spray port 19 intermittently.

[0030] In other words, regardless of whether the water level of the stored water is lower than a predetermined water level, the control device 12B periodically and intermittently opens the solenoid valve 14A (second solenoid valve) to spray water from the water injection nozzle 16, and also periodically and intermittently opens the solenoid valve 14B (third solenoid valve) to spray water from the water injection port 19. Therefore, even if the water level of the stored water is rarely lower than the predetermined water level, the control device 12B forms a water film between the side walls 15a, 15b on the first inclined surface 8a and the incineration ash, and also forms a water film between the first inclined surface 8a and the incineration ash. In other words, a water film can be formed on all three wall surfaces surrounding the incineration ash on the first inclined surface 8a. Therefore, the incineration ash can be discharged from the discharge port 7 more reliably and smoothly than the ash extrusion device 1A of the first modification. In this respect, the ash extrusion device 1B of the second modification is superior to the ash extrusion device 1A of the first modification.

[0031] In the ash pusher 1B of the second modified example, the ratio between the total amount of water injected from each water injection nozzle 16 and the water injection port 19 and the amount of water injected into the cooling tank 2 from the water injection pipe 11 is set to be approximately the same as that of the ash pusher 1 of the embodiment and the ash pusher 1A of the first modified example. For example, it is set to be about 1.5:10 to 2:10. This ratio can be set, as in the first modified ash extrusion device 1A, by adjusting the amount of water sprayed from each water injection nozzle 16 by adjusting the opening time of the solenoid valve 14A (second solenoid valve) and by adjusting the amount of water sprayed from the water injection port 19 by adjusting the opening time of the solenoid valve 14B (third solenoid valve).

[0032] In the ash pusher 1B of the second modification, a configuration related to a water injection port 19 that injects water onto the contact surface between the bottom wall of the first inclined surface 8a and the incineration ash is added to the ash pusher 1A of the first modification. The related configuration, i.e., the water injection port 19, the water supply pipe 18A, and the electromagnetic valve 14B (third electromagnetic valve) may be added to the ash pusher 1 of the embodiment, and in this case, the function of the control device 12B of the ash pusher 1B may be appropriately added to the control device 12 of the ash pusher 1.

[0033] As described above, according to the embodiment, the first modification, and the second modification of the ash extrusion device of the present invention, a water film can be formed between the incineration ash on the first inclined surface and both side walls by the injection of water from the water injection nozzle 16, so that the incineration ash can be smoothly discharged from the discharge port 7 of the ash extrusion device. In addition, since the water is injected onto both side walls while avoiding direct impact on the incineration ash, it is possible to avoid a deterioration in the quality of the incineration ash in terms of the moisture content of the incineration ash. Furthermore, since water is not injected onto the entire incineration ash near the discharge port, the amount of water injected by the water injection is significantly less than the amount of water injected from the water injection pipe 11, so that the impact on the "return ash" can be reduced. [Explanation of symbols]

[0034] 1, 1A, 1B ash extrusion equipment 2 Cooling tank 3. Conveyor 4 Scraper (4a upper plate, 4b push plate, 4c tip) 5 Drive unit (5a drive shaft, 5b arm) 6 Introduction 7 Discharge port (7a open end) 8 Bottom plate (8a first slope, 8b second slope, 8c bottom surface) 9 wall (9R rear wall) 10 Water level gauge 11 Water injection pipe 12, 12A, 12B Control device 13 Drain pipe 14, 14A, 14B Solenoid valve 15 Side wall (15a: left side wall in Fig. 2, 15b: right side wall in Fig. 2) 16 (16a, 16b) Water injection nozzle (fan-shaped nozzle) 17 Branch Pipe 18, 18A water supply pipe 19 Water nozzle (fan-shaped nozzle) 20 liner plate (20a front end, 20b rear end, 20c front end surface) 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 plate 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 plate 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 drive device includes a drive shaft disposed above the second inclined surface, and the drive shaft rotates to move the scraper forward and backward along the bottom plate by an arm connected to the drive shaft and the scraper. At least two water injection nozzles corresponding to each of the side walls are provided, which inject water onto the side wall portions above the predetermined water level on both side walls of the first inclined surface while avoiding the incineration ash; The ash extrusion device forms a water film between the both side walls and the incineration ash by the injection, smoothing the discharge of the incineration ash from the discharge outlet.

2. 2. The ash pusher of claim 1, wherein the water injection nozzle is a fan nozzle that injects in a linear spray pattern.

3. The ash pushing device according to claim 2, further comprising a water injection port for injecting water onto a contact surface between the first inclined surface and the incineration ash.

4. The ash pushing device according to claim 3, wherein the water injection port is arranged with a fan-shaped nozzle for injecting the water in a linear spray pattern along the contact surface.

5. The device further includes a control device. The ash extrusion device according to any one of claims 1 to 4, wherein the control device controls at least one of the reciprocating motion of the scraper, the injection of water by the two water injection nozzles, or the injection of water from the water injection port.

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