Incineration ash conveying cooling device and method

Abstract

To provide an incineration ash conveying cooling device capable of preventing incineration ash falling to an ash pit from being scattered while keeping a water content of the incineration ash low.SOLUTION: An incineration ash conveying cooling device 1 comprises: a conveying device 2 for conveying incineration ash to drop the same into an ash pit 6; a sensor 4 for detecting at least dropping timing of the incineration ash; a water sprinkling device 3 for sprinkling water on the incineration ash during dropping; and a control device 5 for allowing the water sprinkling device 3 to intermittently sprinkle water based on the dropping timing of the incineration ash.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to an apparatus and method for transporting and cooling incineration ash discharged from an incinerator. [Background technology]

[0002] The incineration ash discharged from an incinerator is in a high-temperature state and tends to scatter, so it is generally cooled and prevented from scattering. To cool the incineration ash and prevent it from scattering, an incineration ash extrusion device has been used that temporarily submerges the incineration ash in a water tank and then extrudes and discharges the ash that has accumulated in the tank (see Patent Document 1). The incineration ash discharged from the incineration ash extrusion device is transported outside the site and either landfilled or recycled at a final disposal site.

[0003] The applicant has also proposed an incineration ash transporting and cooling device that transports incineration ash discharged from an incinerator using a transporting device and sprinkles water on the incineration ash transported by the transporting device in order to cool the incineration ash and prevent it from scattering (see Patent Document 2). As shown in Figure 8, the incineration ash transporting and cooling device proposed by the applicant comprises a transporting device 61 that transports the incineration ash, a sprinkling device 62 that sprinkles water on the incineration ash transported by the transporting device 61, a sensor 63 that measures the moisture content of the incineration ash, and a control device 64 that feedback controls the amount of water sprinkled by the sprinkling device 62 based on the moisture content of the incineration ash. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 50-71175 [Patent Document 2] Patent No. 6536297 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the incineration ash extrusion device described in Patent Document 1, the incineration ash is submerged in a water tank, so the moisture content of the incineration ash is determined by the amount of moisture that the incineration ash can contain, resulting in a high moisture content. If the moisture content of the incineration ash is high, unnecessary costs will be incurred for transportation and processing. In addition, the ash extrusion device itself will incur costs for ash wastewater treatment, etc.

[0006] Furthermore, in the incineration ash transport and cooling device described in Patent Document 2, since the incineration ash is not supplied to the transport device in a fixed amount, even with feedback control, fluctuations in the moisture content occur due to fluctuations in the ash amount. Also, even if the transport device properly sprays water, the incineration ash falls from a high place into the ash pit, causing the ash to scatter.

[0007] Therefore, the first object of the present invention is to provide an incineration ash transport and cooling device and method that can prevent the incineration ash from scattering when it falls into the ash pit while keeping the moisture content of the incineration ash low.

[0008] The second object of the present invention is to provide an incineration ash transport and cooling device and method that can spray the minimum amount of water necessary to suppress dust generation while keeping the moisture content of the incineration ash low. [Means for solving the problem]

[0009] In order to solve the first problem described above, the first aspect of the present invention is an incineration ash transporting and cooling device that includes a transporting device that transports incineration ash and drops it into an ash pit, a sensor for detecting at least the timing of the fall of the incineration ash, a sprinkler device that sprinkles water on the incineration ash as it falls, and a control device that causes the sprinkler device to intermittently sprinkle water based on the timing of the fall of the incineration ash.

[0010] In order to solve the second problem above, a second aspect of the present invention is an incineration ash transporting and cooling device comprising: a transporting device for transporting incineration ash; a sensor for measuring the weight of the incineration ash transported by the transporting device; a sprinkler device for sprinkling water on the incineration ash; and a control device for controlling the amount of water sprinkled by the sprinkler device based on the weight of the incineration ash, wherein the sensor measures the weight of the incineration ash before sprinkling by the sprinkler device. [Effects of the Invention]

[0011] According to the first aspect of the present invention, water is intermittently sprayed onto the falling incineration ash based on the timing of the incineration ash's fall, so the moisture content of the incineration ash can be kept low and the incineration ash falling into the ash pit can be prevented from scattering. Since the amount of incineration ash transported by the transport device is not constant, simple water spraying (letting it flow) cannot achieve optimal water addition.

[0012] According to the second aspect of the present invention, the weight of the incineration ash transported by the transport device is measured, and the amount of water sprayed by the sprinkler device is controlled based on the weight of the incineration ash, so that the minimum amount of water required to suppress dust generation can be sprayed while keeping the moisture content of the incineration ash low. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a schematic diagram of an incineration ash transporting and cooling device according to a first embodiment of the present invention. [Figure 2] 1 is a flowchart of an incineration ash transport and cooling method according to a first embodiment of the present invention. [Figure 3] FIG. 4 is a schematic diagram of an incineration ash transporting and cooling device according to a second embodiment of the present invention. [Figure 4] FIG. 10 is a diagram showing measurement data of a sensor. [Figure 5] FIG. 10 is a schematic diagram of an incineration ash transporting and cooling device according to a third embodiment of the present invention. [Figure 6] FIG. 10 is a diagram showing measurement data of a sensor. [Figure 7] 10 is a flowchart of a method for transporting and cooling incineration ash according to a third embodiment of the present invention. [Figure 8] FIG. 1 is a schematic diagram of a conventional incineration ash transport and cooling device. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, an incineration ash transporting and cooling device and method according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the incineration ash transporting and cooling device and method according to the present invention can be embodied in various forms and are not limited to the embodiments described herein. The present embodiment is provided with the intention that those skilled in the art will be able to fully understand the invention by fully disclosing the specification. (First embodiment)

[0015] As shown in Fig. 1, the incineration ash transporting and cooling device 1 of the first embodiment of the present invention comprises a transporting device 2, a sprinkling device 3, a sensor 4, and a control device 5. Each of the components will be described below. (Transportation device)

[0016] The incineration ash discharged from the incinerator is temporarily stored in the ash storage section of the incinerator and then intermittently discharged. The ash storage section is equipped with a known discharge device such as a damper-type discharge device, a screw-type discharge device, or a pusher-type discharge device for intermittently discharging the incineration ash.

[0017] Incineration ash discharged from the incinerator is fed into the inlet 2a of the conveying device 2 either via another conveying device or directly. The conveying device 2 conveys the incineration ash and drops it into the ash pit 6. In the following, an example in which the conveying device 2 is a scraper conveyor will be described, but the conveying device 2 is not limited to a scraper conveyor and may be a vibrating conveyor, belt conveyor, screw conveyor, etc.

[0018] The conveying device 2 includes a case 11 extending in the conveying direction, a plurality of pulleys 12a and 12b, a pair of endless chains 13, for example, wound around the pulleys 12a and 12b, and a plurality of scrapers 14 attached to the chains 13.

[0019] The case 11 is cylindrical with a substantially rectangular cross section and includes an upstream horizontal section 11a extending horizontally, a downstream horizontal section 11c positioned higher than the upstream horizontal section 11a and extending horizontally, and an intermediate inclined section 11b connected to the upstream horizontal section 11a and the downstream horizontal section 11c and inclined upward downstream. An inlet 2a is provided in the upstream horizontal section 11a, and an outlet 2b is provided in the downstream horizontal section 11c. The case 11 may also be composed of only the horizontal section, without providing the intermediate inclined section 11b.

[0020] The pulleys 12a and 12b include a drive pulley 12b and a driven pulley 12a. The drive pulley 12b is rotationally driven by a drive source (not shown).

[0021] A plurality of scrapers 14 are attached to the chain 13 at a fixed pitch (for example, a pitch of 900 mm to 1500 mm).

[0022] The incineration ash fed from the inlet 2a falls onto the bottom plate of the case 11. When the chain 13 is rotated by the drive pulley 12b, the scraper 14 attached to the chain 13 scrapes off the incineration ash accumulated on the bottom plate of the case 11 and transports it to the outlet 2b.

[0023] The incineration ash transported to the discharge outlet 2b falls from the discharge outlet 2b into the ash pit 6. Since multiple scrapers 14 are attached to the chain 13 at a fixed pitch, the incineration ash falls from the discharge outlet 2b into the ash pit 6 intermittently (for example, once every 1 to 1.5 minutes, for a period of 5 to 10 seconds).

[0024] In this embodiment, no sprinklers are provided inside the transport device 2 except for the discharge port 2b. The incineration ash introduced through the inlet 2a is transported to the discharge port 2b as dry ash without being humidified. (Sprinkler system)

[0025] The sprinkler device 3 comprises a water pipe 21, a flow meter 22, a solenoid valve 23, and a nozzle 24. The water pipe 21 carries cooling water for cooling the incineration ash. The nozzle 24 is arranged at the discharge port 2b of the transport device 2 and sprinkles water on the incineration ash as it falls from the discharge port 2b to the ash pit 6. The nozzle 24 may come out of a chute at the discharge port 2b and sprinkle water on the incineration ash as it falls inside the ash pit 6. The nozzle 24 may also sprinkle water on the incineration ash as it falls down the chute at the discharge port 2b.

[0026] The nozzle 24 is a spray nozzle that sprays cooling water in a mist. It is desirable that the direction of the nozzle 24 be adjustable using a ball joint or the like. The nozzle 24 may spray cooling water in a conical shape, the side of the cone, a fan-shaped shape, or a curtain-shaped shape. The number of nozzles 24 is not particularly limited, and two or more rows of nozzles 24 may be provided vertically, or two or more rows of nozzles 24 may be provided horizontally. Regardless of whether or not water is sprayed by the conveying device 2, the area where the incineration ash falls from a high place, i.e., the chute at the discharge outlet 2b, is prone to scattering of incineration ash. Spraying water at the chute at the discharge outlet 2b can effectively prevent the incineration ash from scattering.

[0027] The solenoid valve 23 is controlled to be turned on and off by the control device 5. The flow meter 22 measures the amount of water sprayed by the nozzle 24. The signal from the flow meter 22 is sent to the control device 5. (sensor)

[0028] The sensor 4 in this embodiment is a sensor for detecting the timing of the fall of incineration ash, which falls intermittently from the discharge port 2b of the conveying device 2 into the ash pit 6. The sensor 4 in this embodiment does not directly detect the incineration ash, but rather detects the timing of the fall of the incineration ash by detecting the position of the scraper 14. Since multiple scrapers 14 are attached to the chain 13 at a constant pitch, for example, by detecting the position of the upper scraper 14, it is possible to detect whether the lower scraper 14 will drop the incineration ash N seconds later, i.e., the timing of the fall of the incineration ash. The type of sensor 4 is not particularly limited, and examples include limit switches, proximity sensors, photoelectric sensors, and displacement sensors. (Control device)

[0029] The control device 5 includes a computer such as a microcomputer. The control device 5 controls the solenoid valve 23 to turn on and off based on the timing of the drop, and causes the sprinkler device 3 to intermittently sprinkle water.

[0030] Specifically, the control device 5 starts sprinkling water N-1 to 2 seconds after the sensor 4 detects the position of the scraper 14, based on the parameter that the scraper falls N seconds later. The control device 5 preferably starts sprinkling water at least 1 second before the incineration ash falls. This allows the incineration ash to pass within the spray area of ​​the nozzle 24, further preventing the incineration ash from scattering. On the other hand, if sprinkling water is started more than 2 seconds before the incineration ash falls, the moisture content of the incineration ash accumulated in the ash pit 6 will increase. For this reason, it is preferable to start sprinkling water N-1 to 2 seconds later.

[0031] The control device 5 starts sprinkling and continues sprinkling for M seconds set in a timer or the like, and then stops sprinkling. The control device 5 can adjust the sprinkling time (M seconds) from when the sprinkler device 3 starts sprinkling until it stops. M seconds is set to be longer than the time from when the incineration ash starts falling until it stops. This makes it possible to prevent the incineration ash from scattering when it falls, and to optimally adjust the moisture content of the incineration ash. (Ash Pit)

[0032] The ash pit 6 is provided to store the incineration ash. The incineration ash stored in the ash pit 6 is picked up by a crane bucket (not shown) and loaded onto a truck or the like. The incineration ash loaded onto the truck is transported outside the site and either landfilled or recycled at a final disposal site. (Incineration ash transport and cooling method)

[0033] 2 shows a flowchart of the incineration ash transport and cooling method according to the first embodiment of the present invention. When incineration ash is fed into the inlet 2a of the transport device 2, the transport device 2 transports the fed incineration ash to the discharge outlet 2b (transportation step, S1). The sensor 4 detects the scraper 14 to detect the timing of the incineration ash falling from the discharge outlet 2b of the transport device 2 into the ash pit 6 (detection step, S2). The control device 5 intermittently sprinkles water on the falling incineration ash based on the timing of the incineration ash's fall (water sprinkling step, S3). Specifically, based on the parameter that the ash falls N seconds after the sensor 4 detects the scraper 14, the control device 5 starts sprinkling water N-1 to 2 seconds later, continues sprinkling water for M seconds set in a timer, etc., and then stops sprinkling water. (effect) The effects of the incineration ash transport and cooling device and method of this embodiment will be described below.

[0034] Water is sprayed onto the incineration ash as it falls from the discharge port 2b of the transport device 2 to the ash pit 6, preventing scattering (dust generation) of the incineration ash as it falls. In addition, water is sprayed intermittently based on the timing of the fall of the incineration ash, so the moisture content of the incineration ash can be kept low.

[0035] Since the sprinkler device 3 starts sprinkling water before the incineration ash falls from the discharge port 2b of the transport device 2 into the ash pit 6, the incineration ash can pass within the range of the nozzle 24's sprinkling area, which further prevents the incineration ash from generating dust. In addition, it is possible to absorb the error between the timing of the incineration ash falling detected by the sensor 4 and the actual timing of the incineration ash falling.

[0036] Since the time from when the sprinkler device 3 starts to stop sprinkling water can be adjusted, the moisture content of the incineration ash can be appropriately controlled. (Incineration ash drying dust prevention device)

[0037] The incineration ash transport and cooling device 1 of the first embodiment of the present invention can optimally adjust the moisture content of the incineration ash stored in the ash pit 6. However, after several days, the surface of the incineration ash stored in the ash pit 6 will dry naturally. To prevent the dust generation from increasing due to natural drying, an incineration ash drying and dust generation prevention device 31 is provided.

[0038] As shown in FIG. 1, the incineration ash drying dust prevention device 31 includes a sprinkler device 32 that sprinkles water on the incineration ash in the ash pit 6, and a control device 33 that controls the timing of the sprinkler device 32 to sprinkle water.

[0039] The sprinkler device 32 comprises a water pipe 41, a flow meter 42, a solenoid valve 43, and a nozzle 44. The nozzle 44 is placed above the ash pit 6 and sprinkles water onto the incineration ash stored in the ash pit 6. The nozzle 44 is a spray nozzle that sprays cooling water in the form of a mist.

[0040] The control device 33 controls the ON / OFF of the electromagnetic valve 43 to intermittently sprinkle water from the sprinkler device 32. The control device 33 can adjust the sprinkling time of the sprinkler device 32 using a timer or the like.

[0041] By installing an incineration ash drying and dust prevention device 31 and spraying water when dust generation increases, the moisture content of the incineration ash in the ash pit 6 can be maintained at an appropriate level, preventing the incineration ash from drying and generating dust while suppressing the weight of ash transported. (Second embodiment)

[0042] 3 shows an incineration ash transporting and cooling apparatus 7 according to a second embodiment of the present invention. The incineration ash transporting and cooling apparatus 7 of this embodiment comprises a transporting device 2, a sprinkling device 3, a sensor 8, and a control device 5. The configurations of the transporting device 2, the sprinkling device 3, and the incineration ash drying and dust prevention device 31 are substantially the same as those of the incineration ash transporting and cooling apparatus 1 of the first embodiment, so the same reference numerals are used and their explanations will be omitted.

[0043] In the incineration ash transporting and cooling device 7 of the second embodiment, the sensor 8 detects the timing of the fall of the incineration ash and measures the weight of the incineration ash transported by the transport device 2.

[0044] As shown in Figure 4, the sensor 8 is, for example, an ultrasonic sensor, and measures the thickness of the incineration ash transported by the transport device 2. The sensor 8 measures not only the thickness of the incineration ash but also the height of the scraper 14, but by excluding the scraper 14 part, it is possible to measure the thickness of the incineration ash as shown by the diagonal lines in Figure 4.

[0045] The measurement data of the sensor 8 is transmitted to the control device 5. The control device 5 determines whether or not there is incineration ash based on the measurement data. For example, if the thickness is equal to or greater than a predetermined threshold, it is determined that there is incineration ash, and if the thickness is less than the predetermined threshold, it is determined that there is no incineration ash. If the presence or absence of incineration ash can be determined, the transport speed of the incineration ash is known, so it is possible to detect how many seconds it will take for the incineration ash to fall, i.e., the timing of the fall. In addition to the sensor 8, another sensor 4 may be provided that only detects the timing of the fall of the incineration ash, as in the first embodiment.

[0046] The control device 5 integrates the thickness of the incineration ash over time and calculates the integral value of the thickness of the incineration ash. The integral value of the thickness of the incineration ash is proportional to the volume of the incineration ash. Since there is a correlation between the volume and weight of the incineration ash, the integral value of the thickness of the incineration ash is proportional to the weight of the incineration ash. By calculating the integral value of the thickness of the incineration ash, the weight of the incineration ash can be estimated (measured) before watering.

[0047] The control device 5 controls the sprinkler device 3 to sprinkle water intermittently based on the timing of the fall. The control device 5 also controls the amount of water sprinkled by the sprinkler device 3 based on the measured weight of the incineration ash. Specifically, it adjusts the timing to start sprinkling and the duration of sprinkling. This allows the moisture content of the incineration ash in the ash pit 6 to be appropriately controlled.

[0048] Reference numeral 9 denotes a sprinkler device that sprinkles water on the incineration ash transported by the transport device 2. The transport device 2 may be provided with a sprinkler device 9 (nozzle 15 and solenoid valve 16) to sprinkle water on the incineration ash within the transport device 2. The amount of water sprinkled by the sprinkler device 9 is controlled based on the weight of the incineration ash. By sprinkling water within the transport device 2 and within the ash pit 6, the moisture content of the incineration ash can be more appropriately controlled. (Third embodiment)

[0049] 5 shows an incineration ash transporting and cooling device 51 according to a third embodiment of the present invention. The incineration ash transporting and cooling device 51 of this embodiment comprises a transporting device 52, a sprinkling device 53, a sensor 54, and a control device 55.

[0050] 5 shows an example in which the conveying device 52 is a vibrating conveyor (a conveyor that conveys incineration ash by linearly vibrating the trough 52a in an oblique direction), but the conveying device 52 may also be a scraper conveyor, belt conveyor, or screw conveyor. The conveying device 52 of this embodiment intermittently discharges incineration ash intermittently fed from an incinerator or an upstream conveying device to another downstream conveying device or ash pit.

[0051] The sensor 54 is a sensor for measuring the weight of the incineration ash. The sensor 54 is located upstream of the sprinkler device 53 and measures the weight of the incineration ash before the sprinkler device 53 sprinkles water. The sensor 54 is, for example, an ultrasonic sensor, and measures the thickness of the incineration ash transported by the transport device 52.

[0052] Figure 6 shows the measurement data measured by the sensor 54. The measurement data measured by the sensor 54 is sent to the control device 55. The control device 55 determines whether or not there is incineration ash based on the measurement data. For example, if the thickness is equal to or greater than a predetermined threshold, it determines that there is incineration ash, and if the thickness is less than the predetermined threshold, it determines that there is no incineration ash. If it is possible to determine whether there is incineration ash, the transport speed of the incineration ash is known, and it is therefore possible to know how many seconds it will take for the incineration ash to reach the sprinkler device 53.

[0053] The control device 55 integrates the thickness of the incineration ash over time and calculates the integral value of the thickness of the incineration ash. The integral value of the thickness of the incineration ash is proportional to the volume of the incineration ash. Since there is a correlation between the volume and weight of the incineration ash, the integral value of the thickness of the incineration ash is proportional to the weight of the incineration ash. By calculating the integral value of the thickness of the incineration ash, the weight of the incineration ash can be estimated (measured) before watering.

[0054] Reference numeral 53 shown in Figure 5 is a sprinkler device that sprinkles water on the incineration ash transported by the transport device 52. The sprinkler device 53 includes an electromagnetic valve 57 and a nozzle 56. The nozzle 56 is arranged on the transport device 52 and sprinkles water on the incineration ash transported by the transport device 52. The nozzle 56 may also be arranged at the discharge outlet of the transport device 52 and sprinkle water on the incineration ash dropping from the transport device 52.

[0055] The solenoid valve 57 is controlled to turn on and off by the control device 55. The control device 55 controls the amount of water sprinkled by the sprinkler device 53 based on the measured weight of the incineration ash. Specifically, it controls the timing when the sprinkler device 53 starts sprinkling water and the duration of the sprinkling. This makes it possible to appropriately control the moisture content of the incineration ash transported by the transport device 52. Furthermore, by sprinkling water on the incineration ash that has been spread thinly on the transport device 52, the moisture content of the incineration ash can be made more uniform.

[0056] 7 shows a flowchart of the incineration ash transport and cooling method according to the third embodiment of the present invention. When incineration ash is fed into the transport device 52, the transport device 52 transports the fed incineration ash (transportation step, S1). The sensor 54 measures the weight of the incineration ash transported by the transport device 52 (weight measurement step, S2). In the weight measurement step S2, the weight of the incineration ash is measured before being watered in the watering step S3. The watering device 53 sprinkles water on the incineration ash transported by the transport device 52 (watering step, S3). In the watering step S3, the control device 55 controls the amount of water to be sprinkled based on the weight of the incineration ash. [Explanation of symbols]

[0057] 1, 7, 51... Ash transport and cooling equipment 2,52...Transportation device 3,9,53...Water sprinkler 4,8,54...sensor 5,55...Control device 6...Ash pit

Claims

1. A conveying device that conveys the incineration ash and drops it into the ash pit; a sensor for detecting the timing of the fall of at least incineration ash; A sprinkler device that sprinkles water on falling incineration ash; An incineration ash transport and cooling device comprising: a control device that causes the sprinkler device to intermittently sprinkle water based on the timing of the fall of incineration ash.

2. 2. The incineration ash transporting and cooling device according to claim 1, wherein the control device starts sprinkling water by the sprinkler device before the incineration ash falls from the discharge outlet of the transporting device.

3. 3. The incineration ash transporting and cooling device according to claim 1, wherein the control device is capable of adjusting the time from when the sprinkler device starts to sprinkle water until when it stops sprinkling water.

4. The incineration ash transporting and cooling device according to claim 1 or 2, characterized in that the sensor is also a sensor for measuring the weight of the incineration ash transported by the transporting device before watering, or another sensor is provided for measuring the weight of the incineration ash transported by the transporting device before watering.

5. 5. The incineration ash transport and cooling device according to claim 4, wherein the control device controls the amount of water sprinkled by the sprinkler device based on the weight of the incineration ash.

6. a conveying device for conveying incineration ash; A sensor for measuring the weight of the incineration ash transported by the transport device; A sprinkler device for sprinkling water on the incineration ash; A control device that controls the amount of water sprinkled by the sprinkler based on the weight of the incineration ash, An incineration ash transport and cooling device in which the sensor measures the weight of the incineration ash before water is sprinkled by the sprinkler device.

7. 7. The incineration ash transporting and cooling device according to claim 1, wherein the transporting device is a scraper conveyor, a vibration conveyor, a belt conveyor, or a screw conveyor.

8. a conveying step of conveying the incineration ash by a conveying device; A detection step of detecting the timing at which the incineration ash falls from the conveying device to the ash pit; A water sprinkling process for intermittently sprinkling water on the falling incineration ash based on the timing of the incineration ash falling; A method for transporting and cooling incineration ash.

9. a conveying step of conveying the incineration ash by a conveying device; A weight measurement step of measuring the weight of the incineration ash transported by the transport device; A water sprinkling step of sprinkling water on the incineration ash, In the water sprinkling step, the amount of water sprinkled is controlled based on the weight of the incineration ash, In the weight measuring step, the weight of the incineration ash before the water spraying step is measured.

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