JP2023043984A - Specific-gravity sorting apparatus and incinerator ash treatment system equipped with the same - Google Patents

Abstract

To provide a specific-gravity sorting apparatus capable of improving sorting accuracy of sorting low specific-gravity particles and high specific-gravity particles included in incinerator ash of a waste, and an incinerator ash treatment system equipped with the specific-gravity sorting apparatus.SOLUTION: A specific-gravity sorting device 5A includes: a vibration plate 52 to which incinerator ash of a waste with a particle diameter within a predetermined range is supplied, and that is inclinedly disposed and has permeability; a blower 62 that supplies air passing through the vibration plate 52 and flowing from a lower surface side toward an upper surface side of the vibration plate 52; a vibration device 53 that vibrates the vibration plate 52 in a direction along an inclined angle larger than an inclined angle of the vibration plate 52; an electrode plate 63 that is disposed so as to incline in an opposite direction to the vibration plate 52 at an inclined angle larger than the inclined angle of the vibration plate 52, above the vibration plate 52; and a DC power supply 64 that applies DC voltage between the vibration plate 52 and the electrode plate 63 so that the vibration plate 52 becomes a positive pole and the electrode plate 63 becomes a negative pole.SELECTED DRAWING: Figure 2

Description

TECHNICAL FIELD The present disclosure relates to a specific gravity sorter used for sorting incinerated ash of waste and an incinerated ash processing system including the same.

In the past, waste such as municipal waste was incinerated in an incinerator, and the incineration ash generated by incineration was landfilled at a final disposal site.

In recent years, attempts have been made to recover and recycle metals from incineration ash, and to effectively utilize metal-removed incineration ash as civil engineering materials. As a result, the amount of incinerated ash brought into the final disposal site can be reduced, and the life of the final disposal site can be extended.

In Patent Document 1, incineration ash composed of a group of particles classified to a certain particle size is gravity sorted by a dry specific gravity sorter, and lightweight ash with a small specific gravity is recovered, and heavy ash with a large specific gravity is recovered. It is described that a light ash having a reduced lead content is sorted out by this.

JP 2017-140556 A

The light ash (low specific gravity sorted ash) recovered by the dry specific gravity sorter of Patent Document 1 contains a small amount of high specific gravity particles such as lead, and the heavy ash (high specific gravity sorted ash) contains contains a small amount of low specific gravity particles with a small specific gravity. Thus, the high specific gravity particles and low specific gravity particles contained in the incinerated ash cannot be completely separated and sorted, and there is room for improvement in terms of improving the sorting accuracy.

The present disclosure has been made to solve the above problems, and a specific gravity sorter that can improve the sorting accuracy of sorting low specific gravity particles and high specific gravity particles contained in waste incinerated ash and It aims at providing the incineration ash disposal system provided with this.

In order to achieve the above object, a specific gravity sorter according to an aspect of the present disclosure is supplied with incinerated ash of waste whose particle size is aligned within a predetermined range, and is provided with a vibrating device having ventilation that is arranged at an angle. a plate, an air blower that passes through the diaphragm and supplies air from the lower surface side to the upper surface side of the diaphragm, and vibration that vibrates the diaphragm in a direction along an inclination angle larger than the inclination angle of the diaphragm. a device; an electrode plate disposed above the diaphragm so as to be inclined in a direction opposite to the diaphragm at an inclination angle equal to or greater than the inclination angle of the diaphragm; and the diaphragm serves as a positive electrode and the electrode plate serves as a negative electrode. and a DC power supply that applies a DC voltage between the diaphragm and the electrode plate so that

Further, an incinerated ash treatment system according to an aspect of the present disclosure includes the above-described specific gravity sorting device to which incinerated ash discharged from an incinerator for incinerating waste and having a particle size aligned within a predetermined range is supplied; and a carbonization processing device, and the specific gravity sorting device mainly contains high specific gravity sorted ash mainly composed of high specific gravity particles with high specific gravity and low specific gravity particles with small specific gravity. It is configured to be sorted into low specific gravity sorted ash as a component and discharged from the diaphragm, and the carbonation device is configured to be discharged from the diaphragm of the specific gravity sorter. and carbonation of the low-specific-gravity sorted ash by bringing it into contact with the purified exhaust gas discharged from the incinerator.

The present disclosure has the configuration described above and is capable of improving the sorting accuracy of sorting low-specific-gravity particles and high-specific-gravity particles contained in waste incineration ash, and an incinerator equipped with the same. The effect is that an ash disposal system can be provided.

FIG. 1 is a diagram showing a schematic configuration of an example of an incinerated ash treatment system and its related equipment according to this embodiment. FIG. 2 is a schematic diagram showing an example of the gravity sorter and the carbonation treatment device of this embodiment. FIG. 3 is a graph showing the Cu enrichment rate in high-gravity sorted ash created based on the results of sorting experiments using two gravity sorters. FIG. 4 is a graph showing the Pb concentration in low-gravity sorted ash created based on the results of sorting experiments using two gravity sorters. FIG. 5 is a schematic diagram showing another example of the gravity sorting apparatus of this embodiment. FIG. 6 is a perspective view showing another example of the specific gravity sorting device of this embodiment. FIG. 7 is a sectional view taken along line II in FIG. 6 showing only the diaphragm and the electrode plate.

Preferred embodiments of the present disclosure will be described below with reference to the drawings. In the following description, the same reference numerals are given to the same or corresponding elements throughout all the drawings, and duplicate descriptions thereof will be omitted. In addition, the drawings schematically show respective constituent elements for easy understanding, and the shapes, dimensional ratios, and the like may not be accurate representations. Also, the present disclosure is not limited to the following embodiments.

(embodiment)
FIG. 1 is a diagram showing a schematic configuration of an example of an incinerated ash treatment system and its related equipment according to this embodiment.

In FIG. 1, an incineration plant BS is shown as a related facility of the incineration ash treatment system AS. The incineration plant BS includes an incinerator 7 for incinerating waste, a boiler 8, a turbine 9, a generator 10, and a dust collector 11, a blower 12 and a chimney 13 as exhaust gas treatment equipment.

The incinerator 7 is a stoker type incinerator having a main combustion chamber 7A, a reburning chamber 7B, a hopper 71, a dust feeder 72 and a plurality of stoker 73. The waste thrown into the hopper 71 is fed into the main combustion chamber 7A by the dust feeder 72, dried on the stoker 73, ignited and burned. The bottom ash m remaining after combustion is discharged from the discharge chute 74 . The main ash m and the dust ash n dropped from the stoker 73 are supplied to the incinerated ash conveying device 1 . The exhaust gas from the main combustion chamber 7A is completely combusted in the afterburning chamber 7B.

The boiler 8 has a first flue 81 arranged above the reburning chamber 7B, a second flue 82 communicating with the first flue 81, and a superheater 84 communicating with the second flue 82. and a third flue 83 . The boiler 8 is configured to recover heat from the exhaust gas passing through the first to third flues 81 to 83 to generate steam. The generated steam is sent to the turbine 9 connected to the generator 10 and used for power generation. The exhaust gas that has passed through the boiler 8 is purified by the dust collector 11 and then discharged into the atmosphere through the chimney 13 via the blower 12 .

Further, in the present embodiment, part of the exhaust gas G1 that has passed through the dust collector 11 is supplied to the carbonation treatment device 6 via the blower 14, and further the exhaust gas G2 that has passed through the carbonation treatment device 6 is supplied to the blower 12. is discharged from the chimney 13 into the atmosphere.

The incinerated ash processing system AS includes an incinerated ash conveying device 1, a vibrating conveyor 2, a hanging magnetic separator 3, a classifier 4, a specific gravity separator 5, and a carbonation processor 6.

The incineration ash conveying device 1 is a dry conveyor configured to be supplied with cooling air g from below a wire mesh belt conveyor. The incinerated ash conveying device 1 conveys incinerated ash P consisting of dust ash n and bottom ash m discharged from the incinerator 7 and supplies it to the vibration conveyor 2 .

The incineration ash P supplied to the vibrating conveyor 2 is conveyed by the vibrating conveyor 2 and is supplied to the classifier 4 after removing magnetic substances such as iron when passing under the suspended magnetic separator 3.

The classifier 4 can be composed of, for example, a vibrating sieve. Incineration ash having a particle size within a predetermined range is supplied to a specific gravity sorter 5 by the classifier 4 . Incinerated ash with a particle size outside the predetermined range is treated separately.

The specific gravity sorting device 5 sorts the supplied incineration ash into high specific gravity sorted ash and low specific gravity sorted ash, and the low specific gravity sorted ash is supplied to the carbonation treatment device 6 . Here, high specific gravity sorted ash is incinerated ash whose main constituent is high specific gravity particles (particles with large specific gravity), and low specific gravity sorted ash is mainly composed of low specific gravity particles (particles with small specific gravity). Incineration ash is a component.

FIG. 2 is a schematic diagram showing an example of the gravity sorting device 5 and the carbonation treatment device 6 of FIG. A specific gravity sorting device 5A, which is an example of the specific gravity sorting device 5 of FIG. The apparatus main body 51 has a substantially rectangular parallelepiped shape elongated in the direction of arrow x (hereinafter also referred to as “longitudinal direction x”), and the diaphragm 52 has a rectangular shape elongated in the direction of arrow x when viewed from above. A discharge chute 54 is installed at the upper end of one end side of the apparatus main body 51 in the longitudinal direction x, and a discharge chute 55 is installed at the upper end of the other end side. A vibrating device 53 is fixed to each side surface 51a on both sides of the device main body 51 extending in the longitudinal direction x.

The diaphragm 52 is attached to the device body 51 at an inclination angle α with respect to the horizontal plane 100 so that one end 52a in the longitudinal direction is higher than the other end 52b. A supply port 50 for the incineration ash supplied from the classifier 4 is provided above the central portion of the diaphragm 52 . The vibrating plate 52 is provided with a large number of small holes having a size through which the air supplied from the blower 62 passes and the incineration ash supplied from the supply port 50 does not drop. Such a diaphragm 52 can be made of, for example, a wire mesh with an opening of about several tens of μm. A guide plate for preventing incineration ash from falling may be installed at the upper end of each side surface 51a on both sides in the width direction (the depth direction of the paper surface) of the main body 51 of the apparatus. Also, guide plates may be installed on both sides of each discharge chute 54 , 55 .

The vibrating device 53 is composed of a vibrating motor or the like, and vibrates the device main body 51 in the direction of the arrow S1 with a predetermined period and amplitude. As a result, the diaphragm 52 fixed to the device main body 51 is also vibrated in the direction of the arrow S1. The vibration direction (arrow S1 direction) by the vibrating device 53 is the direction along the inclination angle γ larger than the inclination angle α of the diaphragm 52 with respect to the horizontal plane 100 .

The device body 51 is elastically supported by four springs 56 and 57 attached near the four corners of its bottom surface. Two springs 56 are arranged on the bottom surface of the device main body 51 on the discharge chute 54 side, and two springs 57 are arranged on the bottom surface of the device main body 51 on the discharge chute 55 side.

The two springs 56 on the discharge chute 54 side have their upper ends fixed to the bottom surface of the apparatus main body 51 and their lower ends fixed to a spring mounting plate 58 . A spring mounting plate 58 is fixed to the upper end of the lifting device 59 . The elevating device 59 is installed on the pedestal 60 and can elevate the spring mounting plate 58 . The lifting device 59 may be composed of, for example, a jack or the like having a hydraulic cylinder.

The two springs 57 on the discharge chute 55 side have their upper ends fixed to the bottom surface of the device main body 51 and their lower ends fixed to the pedestal 60 . A blower 62 is installed in the pedestal 60 . A flexible tube 61 is installed between the apparatus main body 51 and the pedestal 60 , and air from a blower 62 is supplied into the apparatus main body 51 through the flexible tube 61 . The air flow is adjusted within the apparatus main body 51 so that the air supplied from the blower 62 is uniformly blown up from the entire surface of the diaphragm 52 .

2, the vibration plate 52 and the device main body 51 may be elastically supported in an inclined state and vibrated in the arrow S1 direction by the vibrating device 53. As shown in FIG.

An electrode plate 63 is arranged above the diaphragm 52 . The electrode plate 63 has a rectangular shape with substantially the same size as the diaphragm 52 , and is arranged to be inclined in the opposite direction to the diaphragm 52 with respect to the horizontal plane 100 . The inclination angle β of the electrode plate 63 is equal to or greater than the inclination angle α of the diaphragm 52 . A DC power supply 64 is provided for applying a DC voltage so that the diaphragm 52 becomes the positive electrode and the electrode plate 63 becomes the negative electrode. By applying a DC voltage from the DC power source 64 , an electric field is generated between the diaphragm 52 and the electrode plate 63 in a direction from the diaphragm 52 toward the electrode plate 63 . A hole for passing the incinerated ash supply port 50 is formed in substantially the center of the rectangular electrode plate 63 .

In this specific gravity sorter 5A, the incinerated ash supplied from the classifier 4 to the central portion of the diaphragm 52 is divided into high specific gravity sorted ash mainly composed of high specific gravity particles indicated by black circles in the figure, and It is sorted into low specific gravity sorted ash whose main component is the low specific gravity particles indicated by the white circles in the middle. Here, the high specific gravity sorted ash moves on the diaphragm 52 in the direction of the discharge chute 54 (direction toward one end 52a of the diaphragm 52), is discharged from the discharge chute 54, and is stored in the container 101, for example. The low specific gravity sorted ash moves on the diaphragm 52 in the direction of the discharge chute 55 (direction toward the other end 52 b of the diaphragm 52 ), is discharged from the discharge chute 55 , and is supplied to the carbonation treatment device 6 . In FIG. 2, the low specific gravity sorted ash discharged from the specific gravity sorting device 5A is configured to be directly supplied to the carbonation treatment device 6, but the low specific gravity sorted ash discharged from the specific gravity sorting device 5A It may be configured to be supplied to the carbonation treatment device 6 via a conveying device.

The principle of sorting high specific gravity particles and low specific gravity particles in the specific gravity sorting device 5A will be described. The incineration ash supplied from the supply port 50 contains heavy metals such as Cu and Pb as high specific gravity particles, and Si, Ca, Al and the like as low specific gravity particles.

The particles with high specific gravity move toward the discharge chute 54 and are discharged from the discharge chute 54 by the vibration of the vibration plate 52 . On the other hand, the low-specific-gravity particles are suspended by the air blown up from the bottom of the diaphragm 52 , and are almost unaffected by the vibration of the diaphragm 52 . be done.

Furthermore, in this example, an electric field is generated in the space between the diaphragm 52 and the electrode plate 63 by applying a DC voltage between the diaphragm 52 and the electrode plate 63 by the DC power supply 64 . Then, the high-conductivity metals (Cu, Pb, etc.) contained in the high-specific-gravity particles are positively charged, and a force directed toward the electrode plate 63 (for example, a force in the direction of arrow S3) acts on the high-specific-gravity particles due to the electric field. do. Therefore, it is possible to assist the movement of the positively charged high specific gravity particles toward the discharge chute 54 . Therefore, the high specific gravity particles are prevented from moving in the direction of the discharge chute 55 by the inclination of the vibration plate 52, the amount of the high specific gravity particles contained in the low specific gravity sorted ash is reduced, and the low specific gravity particles and the high specific gravity particles are sorted. It is possible to improve the sorting accuracy to be used.

Actually, in the specific gravity sorter 5A, it is not possible to completely separate and sort the high specific gravity particles and the low specific gravity particles as shown in FIG. That is, the high-specific-gravity sorted ash discharged from the discharge chute 54 contains high-specific-gravity particles as a main component, but contains a small amount of low-specific-gravity particles. In addition, the low specific gravity sorted ash discharged from the discharge chute 55 contains low specific gravity particles as a main component, but contains a small amount of high specific gravity particles such as Pb.

The carbonation treatment device 6 is a device for carbonating the low specific gravity sorted ash, and promotes carbonation of lead (Pb), calcium (Ca), etc. contained in the low specific gravity sorted ash. This carbonation treatment device 6 can be configured using, for example, a screw type granulator. An example of the carbonation treatment device 6 shown in FIG. A portion of the exhaust gas G1 that has passed through the dust collector 11 in FIG. 1 is supplied to the carbonation treatment device 6 . This exhaust gas G1 is supplied to the post-granulation treatment device 620 and further supplied from the post-granulation treatment device 620 to the screw type granulator 610 .

The low specific gravity sorted ash discharged from the specific gravity sorter 5 is supplied to the screw type granulator 610 from the inlet 612 . Further, the screw type granulator 610 is supplied with water and the exhaust gas G1. In the screw granulator 610, the low specific gravity sorted ash reacts with water and carbon dioxide in the exhaust gas G1 while being transported by the rotation of the screw 611, thereby promoting carbonation and solidifying into granules. Then, the granular low specific gravity sorted ash is supplied to the post-granulation treatment device 620 .

In the granulation post-treatment device 620, the granular low specific gravity sorted ash is transported on a conveyor 621 while being further carbonated by the exhaust gas G1. The conveyor 621 is composed of, for example, a wire mesh belt conveyor, and is supplied with the exhaust gas G1 from below. Here, the carbonation of the outer portion of the granular low-specific-gravity sorted ash mainly progresses, and the granular low-specific-gravity sorted ash with increased strength is discharged from the discharge port 622 .

In this carbonation treatment device 6, Pb, Ca, etc. contained in the low specific gravity sorted ash react with carbon dioxide contained in the exhaust gas G1 and are carbonated. Carbonation of Pb makes Pb insoluble, and the low specific gravity sorted ash discharged from the discharge port 622 becomes ash in which the elution concentration of Pb is kept low. Therefore, it becomes possible to effectively utilize the low specific gravity sorted ash as a safe civil engineering material.

A sorting experiment (hereinafter referred to as "experiment A") using the gravity sorting device 5A shown in FIG. (hereinafter referred to as “experiment B”) was performed. In Experiment A and Experiment B, the air volume of the blower 62, the vibration frequency (vibration frequency) of the vibration device 61, and the inclination angle α of the vibration plate 52 were made equal. Furthermore, in Experiment A, the inclination angle β of the electrode plate 63 was set to be the same as the inclination angle α of the diaphragm 52, and a predetermined DC voltage was applied between the diaphragm 52 and the electrode plate 63 by the DC power supply 64. are doing.

FIG. 3 is a graph showing the Cu concentration rate in the high specific gravity sorted ash created based on the sorting experiment results of Experiment A and Experiment B. FIG. The Cu concentration rate on the vertical axis in FIG. 3 is a value obtained by dividing the Cu concentration in the high-density sorted ash discharged from the discharge chute 54 by the Cu concentration in the incinerated ash supplied from the supply port 50 . As shown in FIG. 3, the Cu enrichment factor for Experiment A is 8.1 and the Cu enrichment factor for Experiment B is 2.7, which is higher for Experiment A than for Experiment B. Cu concentration rate can be increased.

Moreover, FIG. 4 is a graph showing the Pb concentration in the low specific gravity sorted ash created based on the sorting experiment results of Experiment A and Experiment B. As shown in FIG. The Pb concentration on the vertical axis in FIG. 4 is the Pb concentration in the low specific gravity sorted ash discharged from the discharge chute 55 . As shown in FIG. 4, the Pb concentration for experiment A was 150 (ppm) and the Pb concentration for experiment B was 243 (ppm), and experiment A was higher than experiment B. The Pb concentration in the low specific gravity sorted ash can be lowered.

For the device used in Experiment B, the electrode plate 63 is placed above the diaphragm 52 like the gravity sorting device 5A used in Experiment A, and a DC voltage is applied between the diaphragm 52 and the electrode plate 63. By doing so, it is possible to assist the movement of the high specific gravity particles in the direction toward the one end 52 a of the diaphragm 52 . Therefore, according to the specific gravity sorting device 5A, it is possible to improve the sorting accuracy for sorting the low specific gravity particles and the high specific gravity particles contained in the waste incineration ash. For example, by setting the Pb concentration of the low-specific-gravity sorted ash to a predetermined reference value or less, it is possible to effectively utilize the low-specific-gravity sorted ash for civil engineering materials and the like.

FIG. 5 is a schematic diagram showing another example of the gravity sorter 5 of FIG. In the specific gravity sorting device 5B of FIG. 5, one electrode plate 63 is installed in the specific gravity sorting device 5A of FIG. are installed side by side. Other configurations are the same as those of the specific gravity sorter 5A of FIG. Although FIG. 5 illustrates a case in which there are three electrode plates, the number may be two or more. In FIG. 5, it can be said that one electrode plate 63 in FIG. 2 is divided into a plurality of electrode plates 63a to 63c.

Each of the electrode plates 63a to 63c is arranged to be inclined in the opposite direction to the diaphragm 52, and the inclination angle β of each is equal to or greater than the inclination angle α of the diaphragm 52. As shown in FIG. Note that the inclination angles β of the electrode plates 63a to 63c do not necessarily have to be the same angle.

Further, all of the electrode plates 63a to 63c are arranged so that the distance between the diaphragm 52 and the end on the high position side in the inclination direction is within a predetermined distance L or less. The predetermined distance L is shorter than the distance between the vibration plate 52 and the end of the electrode plate 63 of the specific gravity sorter 5A shown in FIG. By shortening the distance between each of the electrode plates 63a to 63c and the vibration plate 52 in this way, the electric field between them can be strengthened, so that the movement of the high specific gravity particles in the direction of the discharge chute 54 can be strengthened. can assist. Therefore, the high specific gravity particles discharged from the discharge chute 55 can be reduced, and the sorting accuracy can be further improved.

In the specific gravity sorting devices 5A and 5B described above, the inclination angle β of the electrode plates 63, 63a to 63c is set to be equal to or greater than the inclination angle α of the diaphragm 52, and a DC voltage is applied between the diaphragm 52 and the electrode plates 63, 63a to 63c. is applied. As a result, the electric field generated between the vibrating plate 52 and the electrode plates 63, 63a to 63 facilitates movement of the high specific gravity particles toward the discharge chute . Here, when the inclination angle β is made larger than the inclination angle α, compared with the case where the inclination angle β is made equal to the inclination angle α, the force of the high-specific-gravity particles directed toward the electrode plate by the electric field is increased by the discharge chute 54. A force is applied in a direction inclined toward the side.

FIG. 6 is a perspective view showing another example of the gravity sorter 5 of FIG. FIG. 7 is a sectional view taken along the line II in FIG. 6 showing only the diaphragm 52A and the electrode plate 63A.

In this gravity sorting device 5C, the shapes of the diaphragm 52A and the electrode plate 63A are different from those of the vibration plate 52 and the electrode plate 63 of the gravity sorting device 5A of FIG. In this specific gravity sorting device 5C, the configuration excluding the electrode plate 63A and the DC power supply 64 can be configured using a well-known air table. Therefore, the diaphragm 52A has a side rope with an inclination angle y and an end rope with an inclination angle α. It also has a vibration device for vibrating the diaphragm 52A in the direction of the arrow S1 and an air blower for supplying an upward air current to the diaphragm 52A.

The diaphragm 52A has a trapezoidal shape, and the trapezoidal upper base side portion serves as a receiving portion 50A for the incinerated ash supplied from the classifier 4, and the trapezoidal lower base end portion has high specific gravity sorted ash and low specific gravity. Serves as an outlet for sorted ash. At this discharge port, for example, a high specific gravity sorted ash discharge chute 54A and a low specific gravity sorted ash discharge chute 55A are arranged side by side.

In this case, as shown in FIG. 7, the diaphragm 52A is vibrated in the direction of the arrow S1, and this vibration direction (the direction of the arrow S1) is along the inclination angle γ larger than the inclination angle α of the diaphragm 52A. . The electrode plate 63A has substantially the same size as the portion of the diaphragm 52A excluding the receiving portion 50A, and as shown in FIG. The inclination angle β of the electrode plate 63A is equal to or greater than the inclination angle α of the diaphragm 52A.

The high specific gravity particles contained in the incineration ash supplied to the receiving part 50A move on the vibration plate 52A in the direction indicated by the arrow a, for example, and are discharged to the high specific gravity sorted ash discharge chute 54A. Also, the low specific gravity particles move on the vibration plate 52A, for example, in the direction indicated by the arrow b, and are discharged to the low specific gravity sorted ash discharge chute 55A. Needless to say, the high specific gravity sorted ash discharged to the discharge chute 54A contains a small amount of low specific gravity particles, and the low specific gravity sorted ash discharged to the discharge chute 55A contains a small amount of high specific gravity particles.

Also in this gravity sorting device 5C, the electrode plate 63A may be divided into a plurality of pieces like the gravity sorting device 5B of FIG. 5 in contrast to the gravity sorting device 5A of FIG.

In any of the specific gravity sorting devices 5A to 5C described above, the incinerated ash supplied to the diaphragms 52 and 52A is in the vibration direction of the diaphragms 52 and 52A when viewed from the direction perpendicular to the diaphragms 52 and 52A (that is, in FIG. 2 , arrow x direction in FIGS. 5 and 6), the ash is separated into high specific gravity sorted ash and low specific gravity sorted ash and discharged from the diaphragms 52 and 52A.

From the above description, many modifications and other embodiments of this disclosure will be apparent to those skilled in the art. Accordingly, the above description is to be construed as illustrative only and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the disclosure. Substantial details of its construction and/or function may be changed without departing from the spirit of the disclosure.

(summary)
A specific gravity sorter according to an aspect of the present disclosure is supplied with incinerated ash of waste whose particle size is aligned within a predetermined range, and passes through a diaphragm having air permeability arranged at an angle and the diaphragm. a blower that supplies air directed from the lower surface side to the upper surface side of the diaphragm, a vibrating device that vibrates the diaphragm in a direction along an inclination angle larger than the inclination angle of the diaphragm, and an upper side of the diaphragm. wherein the electrode plate is inclined in a direction opposite to the diaphragm at an inclination angle equal to or greater than the inclination angle of the diaphragm, and the diaphragm is arranged such that the diaphragm is a positive electrode and the electrode plate is a negative electrode. and a DC power supply that applies a DC voltage between the electrode plate.

According to this configuration, the vibrating device vibrates the diaphragm in a direction along an inclination angle larger than the inclination angle of the diaphragm. As a result, the incinerated ash supplied to the vibration plate is divided into high specific gravity sorted ash mainly composed of high specific gravity particles with a large specific gravity and low specific gravity sorted ash mainly composed of low specific gravity particles with a small specific gravity. It is sorted out and discharged from the diaphragm. Furthermore, by applying a DC voltage between the diaphragm and the electrode plate so that the diaphragm is positive and the electrode plate is negative, the high specific gravity particles containing metals such as copper and lead are positively charged, The electric field imparts a force towards the electrode plates. Therefore, it is possible to assist the movement of the high specific gravity particles in the discharge direction of the high specific gravity sorted ash. Therefore, it prevents high specific gravity particles from moving in the lower direction of the diaphragm (discharge direction of low specific gravity sorted ash), reduces the amount of high specific gravity particles contained in low specific gravity sorted ash, and reduces the amount of low specific gravity particles and high specific gravity particles. It is possible to improve the sorting accuracy for sorting out.

A plurality of the electrode plates are arranged side by side in the tilt direction of the diaphragm, and the electrode plates are arranged such that the distance between the diaphragm and the end of the electrode plate on the high position side in the tilt direction is within a predetermined distance. may be placed.

According to this configuration, the electric field strength between the diaphragm and the electrode plate is prevented from becoming too weak depending on the position of the diaphragm, and the movement of the positively charged high specific gravity particles in the discharge direction of the high specific gravity sorted ash is suppressed. can assist well.

Further, an incinerated ash treatment system according to an aspect of the present disclosure includes the above-described specific gravity sorting device to which incinerated ash discharged from an incinerator for incinerating waste and having a particle size aligned within a predetermined range is supplied; and a carbonization processing device, and the specific gravity sorting device mainly contains high specific gravity sorted ash mainly composed of high specific gravity particles with high specific gravity and low specific gravity particles with small specific gravity. It is configured to be sorted into low specific gravity sorted ash as a component and discharged from the diaphragm, and the carbonation device is configured to be discharged from the diaphragm of the specific gravity sorter. and carbonation of the low-specific-gravity sorted ash by bringing it into contact with the purified exhaust gas discharged from the incinerator.

Here, the low specific gravity sorted ash discharged from the vibration plate of the specific gravity sorter is incinerated ash mainly composed of low specific gravity particles, but contains a small amount of high specific gravity particles containing lead. By carbonating the low-specific-gravity sorted ash, the carbonation of the lead makes the lead insoluble, and the elution concentration of lead can be kept low. becomes possible.

AS Incinerated ash treatment system 5, 5A, 5B, 5C Gravity separator 6 Carbonation treatment device 7 Incinerator 52, 52A Diaphragm 53 Vibration device 62 Blower 63, 63a, 63b, 63c, 63A Electrode plate 64 DC power supply

Claims (3)

a permeable vibrating plate, which is supplied with waste incineration ash having a particle size within a predetermined range;
an air blower that supplies air passing through the diaphragm from the bottom side to the top side of the diaphragm;
a vibrating device that vibrates the diaphragm in a direction along an inclination angle larger than the inclination angle of the diaphragm;
an electrode plate disposed above the diaphragm and inclined in a direction opposite to the diaphragm at an inclination angle equal to or greater than the inclination angle of the diaphragm;
a DC power supply that applies a DC voltage between the diaphragm and the electrode plate so that the diaphragm is positive and the electrode plate is negative;
A specific gravity sorting device with a A plurality of the electrode plates are arranged side by side in the direction of inclination of the diaphragm,
The electrode plate is arranged such that the distance between the end of the electrode plate on the high position side in the tilt direction of the electrode plate and the diaphragm is within a predetermined distance,
The specific gravity sorting device according to claim 1. 3. The specific gravity sorting device according to claim 1 or 2, wherein incinerated ash discharged from an incinerator for incinerating waste and having a particle size within a predetermined range is supplied;
a carbonation device;
with
The specific gravity sorting device is
The incineration ash supplied to the vibration plate is sorted into high specific gravity sorted ash whose main component is high specific gravity particles with high specific gravity and low specific gravity sorted ash whose main component is low specific gravity particles with low specific gravity. configured to be discharged from the diaphragm,
The carbonation treatment device is
The low specific gravity sorted ash discharged from the diaphragm of the specific gravity sorter is brought into contact with the purified exhaust gas discharged from the incinerator to carbonize the low specific gravity sorted ash.
Incineration ash treatment system.

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