JP2019211141A - Pulverizer and exhaust gas treatment device - Google Patents

Abstract

To suppress the attachment of a treatment object having adhesiveness to a fluid medium and the formation of an aggregate of treatment objects.SOLUTION: An inlet 3 and an outlet 4 of a treatment object 15 are provided on an upper end side of a container 2. A fluid medium 6 is filled at an upper side of a dispersion plate 5 close to a lower part of the container 2, and an air box 8 is provided at a lower side of the dispersion plate 5. A fluid bed 7 of the fluid medium 6 is formed at an upper side of the dispersion plate 5 by fluidization air 10 blowed from the air box 8 through the dispersion plate 5. Spray nozzles 12 in a posture directed to the fluid bed 7 is provided at a position above the fluid bed 7 in the container 2, and blow jet flow of air 13 sprayed from the spray nozzles 12 onto a surface of the fluid bed 7. When pulverization treatment of the treatment object 15 is performed in the fluid bed 7, motions of the fluid medium 6 existing in a surface layer of the fluid bed 7 is changed by blowing the jet flow of the air 13 to improve the capability of the pulverization treatment.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a pulverization apparatus that performs a pulverization process on a processing target, and an exhaust gas treatment apparatus including the pulverization apparatus.

  2. Description of the Related Art A fluidized bed device for pulverization processing that performs pulverization processing using dust collection dust discharged from a dust collector that performs dust collection processing of combustion exhaust gas as a processing target has been developed (for example, see Patent Document 1).

  This fluidized bed apparatus has a cylindrical container extending in the vertical direction, an inlet provided at a position closer to one side of the upper end side of the container, and an outlet provided at a position away from the inlet on the upper end side of the container; A dispersion plate attached to a lower position in the container, a fluid medium layer filled on the upper side of the dispersion plate, and an air box provided on the lower side of the dispersion plate. The air blower for working is provided with the structure connected through the air line.

  When the fluidized bed apparatus is used, the air blower is operated, the flowing air sent from the air blower is supplied to the wind box through the air line, and is blown upward from the wind box through the dispersion plate. As a result, in the fluidized bed apparatus, since the fluidizing air is blown into the fluidized medium layer above the dispersion plate from below, fluidization of the fluidized medium occurs, and the fluidized bed is formed in the region above the dispersion plate in the container. It is formed.

  The fluidized bed apparatus is supplied with dust collection dust from the inlet in this state. The dust collection dust falls into the fluidized bed and is taken into the fluidized bed along with the movement of the fluidized medium. In the fluidized bed, collisions between the fluidized media and collisions of the fluidized media with the wall surface of the container occur frequently, so that the dust collected in the fluidized bed is between the fluidized media or between the fluidized medium and the container. The pulverization process is performed between the wall surfaces.

  Thereby, the dust collection dust may contain flake-like aggregates formed by adhering particles such as soot dust, unreacted slaked lime, and reacted slaked lime to each other. The apparatus can pulverize the aggregate.

JP2018-40499A

  The fluidized bed apparatus is effective for pulverizing aggregates contained in the dust collection dust discharged from the dust collector.

  Further, the fluidized bed apparatus is conveyed by the airflow flowing toward the outlet in the container by utilizing the fact that the gravity acting on the particles is reduced as the particle to be processed is pulverized and the particle size is reduced. Only particles crushed to a certain particle size can be recovered from the outlet. Therefore, the fluidized bed apparatus classifies the pulverized particles recovered from the outlet from unmilled particles having a particle size that falls in the airflow flowing toward the outlet in the container and particles that are insufficiently pulverized. This is also effective in that the processing can be performed.

  By the way, slaked lime has adhesiveness. Adhesion is influenced by the moisture concentration of the atmosphere, and the adhesion increases as the moisture concentration increases.

  Therefore, the fluidized bed apparatus has a high moisture concentration and, in some cases, dust collection dust in which slaked lime is exposed on the surface in an atmosphere condition with local dew condensation, or particles having adhesive properties such as slaked lime itself. When supplied as a processing target, one or both of a phenomenon in which the particles to be processed adhere to the fluidized medium and a phenomenon in which an aggregate in which the particles to be processed adhere to each other on the surface of the fluidized bed may occur. I understand that.

  Further, the fluidized bed apparatus is configured such that when the fluidized bed contains a fluid medium in which particles to be treated having adhesion properties or an aggregate in which particles to be treated having adhesion properties are adhered to each other, It has also been found that poor flow may occur in the bed.

  In the fluidized bed of the fluidized bed apparatus, the moving speed of the fluidized medium is the same as the rising speed of bubbles of fluidized air blown through the dispersion plate. The magnitude of the moving speed of the fluid medium affects the magnitude of the collision force of the fluid medium, that is, the magnitude of the pulverization force in the moving bed apparatus.

  Therefore, the fluidized bed apparatus is one of the techniques for improving the pulverizing force, and increases the amount and speed of the flow air to increase the moving speed of the fluidized medium, thereby improving the collision force of the fluidized medium. It is possible to plan However, in the fluidized bed apparatus, since the fluidized medium is required to flow to form a fluidized bed, the amount and speed of the fluidizing air blown into the fluidized bed are determined within a possible range. Therefore, the fluidized bed apparatus is limited in increasing the amount and speed of the fluidizing air.

  Therefore, the present invention suppresses the formation of a fluid medium to which the particles to be processed adhere and the formation of aggregates of the particles to be processed even when the processing target having adhesion is pulverized. It is an object of the present invention to provide a pulverizing apparatus that can handle the exhaust gas, and an exhaust gas treatment apparatus including the pulverizing apparatus.

  In order to solve the above problems, the present invention provides a container, an inlet to be processed provided on the upper end side of the container, an outlet provided on the upper end side of the container, and a position closer to the lower part of the container. A dispersion plate, a fluid medium filled above the dispersion plate, a wind box provided below the dispersion plate, a flow air blower connected to the wind box, and the container A jet nozzle provided in a position facing the fluidized bed at a position above the fluidized bed formed by blowing the fluidizing air into the fluidized medium from below through the dispersion plate; A pulverization apparatus having a configuration including an air supply unit that supplies air to the nozzle.

  A plurality of the injection nozzles, and each injection nozzle has a plurality of recesses formed on the surface of the fluidized bed according to the number of the injection nozzles by blowing the jet of air injected from each of the injection nozzles. It is good also as the structure set as the arrangement | positioning which does not mutually overlap.

  It is good also as a structure which has arrange | positioned the said injection nozzle so that the distance of the said some recessed part formed in the surface of the said fluidized bed may become 1/2 or less of the radius of the said recessed part.

  Further, a dust collector, an inlet side flue connected to the gas inlet of the dust collector and guiding combustion exhaust gas to the gas inlet, a chemical supply nozzle and a circulating material supply nozzle provided in the inlet side flue, and the dust collector A dust discharge port for discharging dust collection dust, and a crushing device, wherein the crushing device is provided with a container, a processing target inlet provided on an upper end side of the container, and an upper end side of the container. An outlet, a dispersion plate provided near the lower portion of the container, a fluid medium filled above the dispersion plate, an air box provided below the dispersion plate, and connected to the air box Flowing air blower, and in the container, facing the fluidized bed at a position above the fluidized bed formed by blowing the flowing air from below through the dispersion plate into the fluidizing medium. Injection nozzle provided in posture And an air supply unit for supplying air to the spray nozzle, wherein the inlet of the pulverizer is connected to the dust discharge port, and the outlet of the pulverizer has a circulation line connected to the circulating product supply nozzle. An exhaust gas treatment apparatus having a configuration connected through the exhaust gas.

  According to the pulverization apparatus of the present invention, even when the pulverization treatment of the processing target having adhesion is performed, the formation of the fluid medium to which the particles to be processed adhere and the formation of aggregates of the particles to be processed are formed. Can be suppressed.

  Further, according to the exhaust gas treatment apparatus of the present invention, the dust collected from the dust collector is treated as a treatment target, and the formation of a fluid medium with the treatment target particles adhered and the aggregation between the treatment target particles are performed in the pulverization apparatus. The pulverization process can be performed in a state where the formation of aggregates is suppressed, and the unreacted portion of the chemical for absorbing acidic gas contained in the dust collection dust can be effectively used.

It is a general | schematic cutting side view which shows embodiment of a grinding | pulverization apparatus. It is an AA direction arrow line view of FIG. It is a BB direction arrow line view of FIG. It is a figure for demonstrating the conditions of the jet stream sprayed on a fluidized bed from an injection nozzle with a grinder. It is a figure which shows the example of arrangement | positioning of the injection nozzle according to the planar shape of a fluidized bed. It is a general | schematic cutting side view which shows embodiment of an waste gas processing apparatus.

  Hereinafter, the grinding device and the exhaust gas treatment device of the present disclosure will be described with reference to the drawings.

[Embodiment of grinding apparatus]
FIG. 1 is a partially cut schematic side view showing an embodiment of a grinding apparatus. FIG. 2 is a view taken in the direction of arrows AA in FIG. FIG. 3 is a BB direction arrow view of FIG. FIG. 4 is a diagram for explaining the conditions of the jet flow sprayed from the injection nozzle to the fluidized bed.

  FIG. 5 shows an example of the arrangement of the recesses formed on the surface of the fluidized bed in accordance with the planar shape of the fluidized bed of the pulverizer. FIG. 5A shows the case where the planar shape of the fluidized bed is square. (B) is a schematic cutting | disconnection top view which respectively shows the case where the planar shape of a fluidized bed is circular.

  1, 2, and 3, the pulverizing apparatus of the present embodiment is indicated by reference numeral 1, and includes a cylindrical container 2 extending in the vertical direction, an inlet 3 and an outlet 4 provided on the upper end side of the container 2. The dispersion plate 5 provided near the lower part in the container 2, the fluidized medium 6 filled on the upper side of the dispersion plate 5 to form the fluidized bed 7, and the wind provided on the lower side of the dispersion plate 5 A posture toward the fluidized bed 7 in a position above the formation position of the fluidized bed 7 in the container 8 and the blower 11 of the flowing air 10 connected to the box 8 via the air line 9. And an air supply unit 14 that supplies air 13 for forming a jet flow to the injection nozzle 12.

  In the present embodiment, the container 2 has a rectangular tube structure with a rectangular planar shape.

  The container 2 includes an inlet 3 at a position closer to one side in the longitudinal direction of the rectangular planar shape on the upper end side (a position closer to the right end in FIG. 1). Although not shown, the inlet 3 includes means for moving the processing object 15 into the container 2 while preventing air blow-off from the inside of the container 2 to the upstream side of the inlet 3 such as a double damper. It has been configured.

  A supply device 16 for the processing target 15 is connected to the upstream side of the inlet 3.

  Further, the container 2 is provided with an outlet 4 at a position away from the inlet 3 on the upper end side, for example, a position closer to the other side in the longitudinal direction of the rectangular planar shape (a position closer to the left end in FIG. 1).

  As will be described later, the outlet 4 serves as the outlet 4 from which the pulverized material 15a obtained by pulverizing the processing target 15 is discharged from the container 2 by air conveyance. Therefore, the outlet 4 is connected to one end side, which is the upstream side of the conveyance line 17 for air conveyance of the pulverized product 15a, and the other end side which is the downstream side of the conveyance line 17 is connected to the demand section 18 of the pulverized product 15a. Has been. The demand unit 18 for the pulverized product 15a may be a device or facility that directly uses the pulverized product 15a, or may be a device or facility that stores the pulverized product 15a once and then uses it as necessary.

  The reason why the outlet 4 is provided at a position away from the inlet 3 in the container 2 is that air flows toward the outlet 4 in the container 2, and is supplied from the inlet 3 and falls inside the container 2 due to the influence of the air flow. This is to prevent the processing target 15 to be blown off before reaching the fluidized bed 7. Therefore, if the processing object 15 dropped and supplied from the inlet 3 can be hardly affected by the air flow toward the outlet 4 in the container 2, the arrangement of the inlet 3 and the outlet 4 is, for example, one or both. Of course, arrangements other than those shown in the figure, such as arrangement near the upper end of the side wall of the container 2, may be adopted.

  The dispersion plate 5 is attached to a position closer to the lower part inside the container 2 so as to partition the internal space of the container 2 into an upper space and a lower space of the dispersion plate 5.

  The dispersion plate 5 is formed of a porous plate or a porous plate through which air can pass while the passage of the fluid medium 6 that is solid particles such as alumina balls and sand is blocked. The dispersion plate 5 has a strength capable of supporting the weight of the fluid medium 6 or is supported by a beam-like support member (not shown) that can support the weight of the fluid medium 6.

  The upper side of the dispersion plate 5 in the container 2 is filled with a fluid medium 6 so as to form a layer having a set thickness.

  The lower side of the dispersion plate 5 on the lower end side of the container 2 is a wind box 8.

  In the present embodiment, the wind box 8 extends from below the position where the processing target 15 supplied from the inlet 3 falls to the side away from the dropping position, that is, in the longitudinal direction of the rectangular planar shape of the container 2. For example, three divided sections 19a, 19b, and 19c are provided from the side to the other side.

  Each divided section 19a, 19b, 19c is individually connected to each branch line 20a, 20b, 20c that branches the downstream side of the air line 9 into three. The upstream side of the air line 9 is connected to the blower 11 of the flow air 10. Further, the branch lines 20a, 20b, and 20c of the air line 9 are respectively provided with flow rate adjusting valves 21a, 21b, and 21c that individually adjust the flow rate of the flowing air 10 supplied to the corresponding divided sections 19a, 19b, and 19c. Is provided.

  When the blower 11 is operated in the crushing apparatus 1 of the present embodiment, the flowing air 10 sent from the blower 11 passes through the air line 9 and the branch lines 20a, 20b, 20c, and the divided sections 19a, 19b of the wind box 8. , 19c. Thereby, in the container 2, it ejects upward from each division | segmentation division 19a, 19b, 19c through the dispersion | distribution board 5. FIG. Therefore, in the pulverizing apparatus 1 of the present embodiment, the fluidizing air 10 is blown upward into the layer of the fluid medium 6 on the upper side of the dispersion plate 5 from below, so that fluidization of the fluid medium 6 occurs and the container A fluidized bed 7 is formed in the upper region of the dispersion plate 5 in 2.

  Furthermore, in the pulverizing apparatus 1 of the present embodiment, the fluidized medium 6 descends at the position where the processing target 15 supplied from the inlet 3 falls on the fluidized medium 6 in the fluidized bed 7 as indicated by an arrow X in FIG. However, in a position away from the position, a circulating flow in which the fluid medium 6 ascends is generated.

  In order to generate this circulatory flow, in the present embodiment, the flow rate and flow velocity of the flow air 10 to be ejected upward from the division section 19b are based on the flow rate and flow velocity of the flow air 10 to be ejected upward from the division section 19a. The flow rate of the flow air 10 supplied to each of the divided sections 19a, 19b, and 19c is increased so that the flow rate and the flow velocity of the flowing air 10 ejected upward from the divided sections 19c are sequentially increased. 21c is adjusted. As a result, in the fluidized bed 7, the flowing air that is blown in the order of the fluid medium 6 positioned above the divided section 19 a, the fluid medium 6 positioned above the divided section 19 b, and the fluid medium 6 positioned above the divided section 19 c. The amount of 10 increases, and the apparent density of the fluidized medium 6 in the region where the amount of flowing air 10 to be blown is large becomes smaller. Therefore, in the fluidized bed 7, based on this apparent density difference, the fluid medium 6 positioned above the divided section 19a moves downward, and the fluid medium 6 positioned above the divided section 19c moves upward. It becomes like this.

  As described above, in the state where the circulating fluid medium 6 as shown by the arrow X is generated in the fluidized bed 7, when the processing target 15 supplied from the inlet 3 falls into the fluidized bed 7, Since the downward movement of the medium 6 occurs, even if the density of the processing target 15 is smaller than the density of the fluidized medium 6, the processing object 15 is taken into the fluidized bed 7 along with the movement of the fluidized medium 6. Can be made.

  In the fluidized bed 7, collisions between the fluidized media 6 and collisions of the fluidized media 6 with respect to the wall surface of the container 2 occur frequently. For this reason, the processing object 15 taken into the fluidized bed 7 is pulverized between the fluidized media 6 or between the fluidized media 6 and the wall surface of the container 2.

  In the present embodiment, the planar shape of the container 2 is a rectangle. In view of this, the pulverizing apparatus 1 according to the present embodiment is provided at three locations at a position above the fluidized bed 7 in the container 2 and at intervals set along the longitudinal direction of the planar shape of the container 2. Further, a configuration in which the injection nozzle 12 is arranged is provided.

  Each injection nozzle 12 is in a downward posture along the vertical direction.

  In the present embodiment, the air supply unit 14 is attached to the side wall of the container 2 so as to penetrate inward and outward, and an air supply pipe 22 having an inner end connected to the injection nozzle 12 and an air supply pipe. 22 provided with an air supply line 23 to which one end side is connected, and an air supply device 24 to which the other end side of the air supply line 23 is connected in a single state. It is configured.

  The air supply device 24 has a function of supplying the air 13 in a state of being pressurized to a pressure set higher than the pressure in the container 2.

  Thereby, the crushing apparatus 1 of this embodiment can supply the pressurized air 13 to each injection nozzle 12 via the air supply line 23 and the air supply pipe 22 when the air supply apparatus 24 is operated. Thus, air 13 can be jetted downward from each jet nozzle 12. Therefore, in the container 2, the jet flow of the air 13 injected from each injection nozzle 12 is sprayed on the surface layer of the fluidized bed 7 located immediately below each injection nozzle 12. At this time, the surface layer of the fluidized bed 7 is a layer in which the concentration (space occupancy) of the particles of the fluidized medium 6 is thinner than other portions of the fluidized bed 7. Hereinafter this layer is referred to as a lean layer. Therefore, the jet of the air 13 injected from the injection nozzle 12 is blown to the lean layer in the fluidized bed 7.

  In the pulverizing apparatus 1 of the present embodiment, the jet of air 13 blown from the injection nozzle 12 to the fluidized bed 7 is set so as to satisfy the following conditions.

  Here, parameters are set for the jet and the fluid medium as shown in the following table.

If the momentum of the jet on the surface of the fluidized bed 7 is Mn, the momentum Mn of the jet is expressed by the following formula: jet density ρn, jet cross-sectional area An on the surface of the fluidized bed 7, and jet velocity. The value is proportional to the square of Vn.
Mn∝ρn × An × Vn ²

When the momentum of the fluidized medium 6 in the fluidized bed 7 is Ms, the momentum Ms of the fluidized bed 7 is expressed by the density ρs of the fluidized medium 6, the projected area As of the particles of the fluidized medium 6, and The value is proportional to the square of the rising speed Vs of the fluid medium 6 and the cross-sectional occupation ratio ε of the fluid medium 6.
Ms∝ρs × As × Vs ² × ε

  The pulverizing apparatus 1 of the present embodiment sets a condition (Mn ≧ Ms) in which the momentum Mn of the jet is equal to or greater than the momentum Ms of the fluidized medium 6 in the fluidized bed 7, and the above-described jet and Each parameter for the fluid medium is set.

  The jet of the air 13 injected from the injection nozzle 12 is decelerated until reaching the surface of the fluidized bed 7 as compared with the speed at the time of injection from the injection nozzle 12, and the rate of the deceleration is as follows: It is influenced by the angle θ at which the jet flow determined by the shape and type of the injection nozzle 12 spreads.

  Therefore, the distance H from the injection nozzle 12 to the surface of the fluidized bed 7 is injected from the injection nozzle 12 based on the set value of the jet velocity Vn on the surface of the fluidized bed 7 set so as to satisfy the above conditions. What is necessary is just to make it set according to the speed of the air 13, and the shape and form of the injection nozzle 12.

  Further, in order to obtain the set value of the jet velocity Vn on the set surface of the fluidized bed 7 with a smaller jet amount of the air 13, the jet nozzle 12 reduces the jet spread angle θ as much as possible. It is only necessary to adopt a nozzle shape and form and increase the flow velocity of the air 13 to be injected.

  Further, the arrangement of the injection nozzle 12 is preferably set as follows.

  When the jet of air 13 jetted from the jet nozzle 12 hits the fluidized bed 7, as shown in FIGS. 1 and 2, the surface of the fluidized bed 7 hits the spot where the jet directly hits, and the periphery of the recess 25. Is formed. As shown by a one-dot chain line in FIG. 3, the recess 25 has a substantially circular shape centered on the center position of the jet of air 13.

  Where the concave portion 25 is formed on the surface of the fluidized bed 7, the influence of the jet of the air 13 in addition to the fluidization movement of the fluidized medium 6 existing in the diluted layer of the fluidized bed 7 by the fluidizing air 10. It is the place that is doing exercise that received.

  Therefore, in the portion where the concave portion 25 is formed in the fluidized bed 7, the movement of hitting downward by the jet of the air 13 blown from above the fluid medium 6 blown up by the fluidizing air 10 and moved to the lean layer. Is given further. Therefore, in this state, the fluid medium 6 existing at the portion where the concave portion 25 is formed in the diluted layer of the fluidized bed 7 has a moving speed and the frequency of collision between the fluidized media 6 is that of the bubbles of the fluidizing air 10. It increases compared with the case where the fluidized medium 6 moves only by ascent. Accordingly, the fluidized bed 7 can improve the pulverization ability of the processing target 15 at the place where the recess 25 is formed, as compared with the case where only the fluidizing medium 6 is fluidized by the fluidizing air 10. .

  Therefore, for example, as shown in FIG. 3, the pulverization apparatus 1 of the present embodiment is arranged with the recesses 25 so that the three recesses 25 are formed in alignment on the surface of the fluidized bed 7 without overlapping each other. And the position of the injection nozzle 12 is set at a position above the center of each recess 25.

  The concave portions 25 are formed on the surface of the fluidized bed 7 so as not to overlap each other. The fluidized medium 6 existing in the lean layer of the fluidized bed 7 by the jet of the air 13 injected from the injection nozzle 12. This is to give a change in motion such as an increase in moving speed and collision frequency to as many fluid media 6 as possible.

  Moreover, it is preferable that the space | interval d of the recessed parts 25 formed in the surface of the fluidized bed 7 shall be 1/2 or less of the radius of the recessed part 25. FIG. This improves the ratio of the area in which the concave portions 25 are formed on the surface of the fluidized bed 7, and changes in motion with respect to as many fluidized media 6 as possible among the fluidized media 6 existing in the diluted layer of the fluidized bed 7. Is to give.

  In addition, in FIG. 3, the example of arrangement | positioning of the recessed part 25 was shown about the structure in the case of providing the fluidized bed 7 in which the planar shape becomes a rectangle in the container 2. FIG. On the other hand, for example, as shown in FIG. 5A, when the planar shape of the fluidized bed 7 formed in the container 2 is a square, the recess 25 is formed on the surface of the fluidized bed 7 as illustrated. What is necessary is just to make it form in four places. In addition, as shown in FIG. 5B, when the planar shape of the fluidized bed 7 formed in the container 2 is circular, the recess 25 is formed on the surface of the fluidized bed 7 in the circumferential direction as illustrated. What is necessary is just to make it form in four places.

  In addition, the arrangement, size, and number of the recesses 25 on the surface of the fluidized bed 7 may be other than those shown in FIGS. 3, 5 (a), and 5 (b). .

  Furthermore, the pulverization apparatus 1 of the present disclosure may be configured such that a plurality of recesses 25 are partially overlapped in the fluidized bed, and an arrangement in which a part of the recesses 25 is applied to the side wall of the container 2. Of course, the interval between the recesses 25 is not limited to a half or less of the radius of the recess 25.

  Note that the pulverizing apparatus 1 may set the position of the injection nozzle 12 at a position above the center of each recess 25 even when the arrangement of the recesses 25 is variously set as described above.

  When the crushing apparatus 1 of the present embodiment having the above configuration is used, the blower 11 is operated, and the divided sections 19a and 19b of the wind box 8 are connected via the air line 9 and the branch lines 20a, 20b, and 20c. , 19c is supplied with the flowing air 10 at a flow rate set respectively. Thereby, the pulverizing apparatus 1 of the present embodiment forms the fluidized bed 7 of the fluidized medium 6 on the upper side of the dispersion plate 5 in the container 2. Further, the fluidized bed 7 also causes the fluid medium 6 to circulate as indicated by the arrow X in FIG.

  Further, the air supply device 24 is operated to supply the air 13 to the injection nozzle 12 through the air supply line 23 and the air supply pipe 22. Thereby, the pulverization apparatus 1 of the present embodiment injects the air 13 from the injection nozzle 12, and the jet of the injected air 13 is sprayed on the surface of the fluidized bed 7.

  In this state, the pulverizing apparatus 1 of the present embodiment operates the supply apparatus 16 to supply the processing target 15 from the inlet 3 into the container 2.

  As a result, when the processing target 15 supplied from the inlet 3 falls to a position below the inlet 3 on the surface of the fluidized bed 7, it is accompanied by the movement of the fluidized medium 6 forming a circulation in the fluidized bed 7. It is taken inside the fluidized bed 7.

  In the fluidized bed 7, the fluidized media 6 collide with each other and the fluidized medium 6 collides with the wall surface of the container 2, so that the processing target 15 captured inside the fluidized bed 7 is between the fluidized media 6 and Then, it is pulverized between the fluid medium 6 and the wall surface of the container 2.

  Furthermore, the pulverizing apparatus 1 according to the present embodiment is configured such that the moving speed of the fluid medium 6 and the collision between the fluid media 6 are affected by the jet of air 13 blown from the ejection nozzle 12 to the thin layer on the surface of the fluidized bed 7. Since an area with increased frequency is formed, in this area, the pulverization process of the processing object 15 can be performed in a state where the ability of the pulverization process for the processing object 15 is further enhanced. As described above, the pulverizing apparatus 1 according to the present embodiment is difficult to process in a fluidized bed in which fluidization is performed only with a conventional fluidizing air, and the fluidized medium 6 to which particles of the processing target 15 having adhesion have adhered. Alternatively, the agglomerates in which particles of the processing target 15 having adhesion are adhered can be pulverized.

  Therefore, the pulverization apparatus 1 according to the present embodiment can suppress the formation of the fluidized medium 6 to which the particles of the processing target 15 having adhesion adhere, and the processing target 15 having adhesion on the surface of the fluidized bed 7. It is also possible to prevent the particles from forming aggregates. For this reason, when the grinding | pulverization apparatus 1 of this embodiment performs the grinding | pulverization process of the process target 15 in the fluidized bed 7, the fluid medium 6 to which the particle | grains of the process target 15 which has adhesiveness adhered, and the process which has adhesiveness. It is possible to suppress the occurrence of poor flow in the fluidized bed 7 due to the aggregate of the particles of the target 15.

  Therefore, the pulverizing apparatus 1 according to the present embodiment is suitable as an apparatus for pulverizing, as a processing target, dust collection dust in which a large amount of adherent slaked lime is exposed on the surface, or particles having adhesiveness such as slaked lime itself. Can be.

  Furthermore, since the pulverizing apparatus 1 of the present embodiment includes a region on the surface layer side of the fluidized bed 7 in which the capability of the pulverization process for the processing target 15 is further increased, the fluidized bed 7 is not subjected to the pulverizing process. The possibility of settling inside can be suppressed.

  The fluidized bed 7 has a problem that the bed height gradually rises when there is a processing target 15 that settles down to the bottom of the fluidized bed 7 without being subjected to the pulverization process, but the pulverization apparatus 1 of the present embodiment has such a problem. The occurrence of problems can be suppressed.

  In the container 2, the flowing air 10 that has been subjected to fluidization of the fluidized bed 7 and the air 13 that has been blown to the fluidized bed 7 as a jet flow from the injection nozzle are airflows flowing toward the outlet 4. Form.

  For this reason, the processing object 15 is subjected to the pulverization process in the fluidized bed 7 to become a pulverized product 15a having a smaller particle diameter, and when the object 15 is conveyed by the airflow flowing toward the outlet 4 in the container 2, 15 a is discharged from the outlet 4 together with the flowing air 10 and the air 13. Therefore, the pulverized product 15 a is pneumatically conveyed to the demand unit 18 through the conveyance line 17.

  On the other hand, the unprocessed processing target 15 and the processing target 15 for which the pulverization process has not sufficiently progressed are temporarily moved above the fluidized bed 7 by the fluidized air 10 or the air 13 blown to the fluidized bed 7. Even if it is blown up, it is not conveyed by the airflow flowing toward the outlet 4 in the container 2, so that it falls to the fluidized bed 7 and further undergoes pulverization processing in the fluidized bed 7.

  Therefore, the pulverization apparatus 1 according to the present embodiment separates the pulverized product 15a pulverized to a predetermined particle size from the processing target 15 that is unprocessed and insufficiently pulverized without requiring a special apparatus for classification. And can be recovered.

  In addition, since a general pulverizer often has a mechanical rotating part such as a rotating shaft, when a processing target is pulverized, a processing target or a pulverized material to be processed adheres to the rotating part. A special structure such as a powder seal that protects the rotating part is required so that there is no risk of corrosion due to components contained in the deposit. On the other hand, the pulverizing apparatus 1 of the present embodiment does not have a mechanical rotating part as well as a mechanically movable part in the part to be treated 15 or the part to which the pulverized material 15a comes into contact. Special structures such as powder seals can be eliminated.

[Embodiment of exhaust gas treatment apparatus]
FIG. 6 is a partially cut schematic side view showing an embodiment of an exhaust gas treatment apparatus.

  Note that the pulverization apparatus included in the exhaust gas treatment apparatus of the present embodiment is the same as the pulverization apparatus 1 shown in the embodiment. Therefore, in FIG. 6, the same components as those shown in FIGS. 1, 2, and 3 are denoted by the same reference numerals, and the description thereof is omitted.

  The exhaust gas treatment apparatus of the present embodiment is indicated by reference numeral 26 in FIG. 6 and includes a bag filter 27 as a dust collector, an inlet side flue 29 connected to a gas inlet 28 of the bag filter 27, and an inlet side flue 29. The crushing device 1 having the inlet 3 connected to the dust discharge port 32 of the bag filter 27 and the outlet 4 of the crushing device 1 are connected to the circulating product supply nozzle 31. And a circulation line 33.

  The bag filter 27 includes a cylindrical container 34 having a rectangular cross section that extends in the vertical direction and has a hopper shape at the bottom. The container 34 includes a gas inlet 28 on the side near the lower portion and a gas outlet 35 on the side on the upper end. For example, a screw conveyor type dust discharge device 36 is provided at the bottom of the container 34, and a dust discharge port 32 is provided below the destination side of the dust discharge device 36.

  A cell plate 37 having a plurality of filter cloth attachment holes 38 opened is hermetically attached at a position below the gas outlet 35 in the upper part of the container 34. Each filter cloth attachment hole 38 of the cell plate 37 supports an upper end portion of a retainer (not shown) in which a cylindrical elongated bag-like filter cloth 39 is held from below to the outer peripheral side. . As a result, each retainer and each filter cloth 39 are suspended below the cell plate 37, and in this state, the upper end opening of each filter cloth 39 passes through the corresponding filter cloth attachment hole 38. It communicates with the space above the plate 37. Further, a backwash device 40 used for backwashing each filter cloth 39 is provided above the cell plate 37 in the container 34.

  An inlet side flue 29 connected to the gas inlet 28 guides the combustion exhaust gas 41 discharged from a combustion apparatus (not shown) such as a waste incinerator to the gas inlet 28.

  An outlet side flue 42 is connected to the gas outlet 35, and downstream equipment such as an induction fan is connected to the downstream side of the outlet side flue 42.

  As a result, when the bag exhaust gas 41 flows from the inlet side flue 29 into the container 34 through the gas inlet 28, the bag filter 27 passes through each filter cloth 39 from the outside to the inside. It becomes a flow toward the exit 35. For this reason, solid particles (not shown) such as soot contained in the combustion exhaust gas 41 are collected by the filter cloths 39. Therefore, the combustion exhaust gas 41 is cleaned by removing the solid particles collected on each filter cloth 39, and the cleaned exhaust gas 41 a is discharged from the gas outlet 35 to the outlet side flue 42. .

  In the bag filter 27, when the process of collecting the solid particles in the combustion exhaust gas 41 by each filter cloth 39 is continuously performed, the collected solid particles accumulate on the outer surface side of each filter cloth 39. Therefore, in the bag filter 27, in order to prevent the pressure loss from becoming excessive, each filter cloth 39 is back-washed by the back-washing device 40 periodically or every set operation time, The deposit adhering to the outer surface of the filter cloth 39 is removed.

  The solid matter that has fallen off naturally from each filter cloth 39 or has been removed by backwashing and dropped to the inner bottom of the container 34 is sent to the dust discharge port 32 by the dust discharge device 36 and is then discharged to the dust discharge port. 32 is discharged as dust collection dust 43.

  The medicine supply nozzle 30 is provided at a location away from the upstream side by a distance set from the gas inlet 28 in the inlet side flue 29.

  The chemical supply nozzle 30 has a function of supplying, for example, slaked lime 44 into the inlet side flue 29 as a chemical for absorbing acidic gas. In addition, it is preferable that the chemical | medical agent supply nozzle 30 is a thing of the form which carries out the slaked lime 44 on a carrier gas flow, and injects. According to the chemical supply nozzle 30 of this type, the slaked lime 44 is supplied in a state in which the dispersibility is improved into the combustion exhaust gas 41 flowing through the inlet side flue 29 toward the gas inlet 28 of the bag filter 27. Can do. Thereby, the slaked lime 44 can make the contact with the acidic gas contained in the combustion exhaust gas 41 efficiently.

  The slaked lime 44 dispersed in the combustion exhaust gas 41 is conveyed to the bag filter 27 by the flow of the combustion exhaust gas 41, and is collected by the filter cloths 39 together with the dust not shown in the bag filter 27. Therefore, the dust collection dust 43 discharged from the dust discharge port 32 includes slaked lime 44 in addition to soot dust.

  In the present embodiment, the slaked lime 44 supplied from the chemical supply nozzle 30 is supplied in an excess amount at a ratio set to an equivalent ratio to the acid gas assumed to be contained in the combustion exhaust gas 41. To do. For this reason, the slaked lime 44 contained in the dust collection dust 43 includes the reacted one that has absorbed the acid gas and the unreacted component.

  In addition, if the chemical | medical agent supply nozzle 30 can distribute and supply slaked lime 44 with respect to the combustion exhaust gas 41 which distribute | circulates the inlet side flue 29, arbitrary formats other than the format which injects the slaked lime 44 using carrier gas. Of course, you may employ | adopt.

  An inlet 46 of a distributor 45 is connected to the dust discharge port 32.

  The distribution device 45 includes two outlets 47 and 48, the first outlet 47 is connected to the ash processing device 49, and the second outlet 48 is connected to the inlet 3 of the pulverizing device 1. Further, the distribution device 45 has a function of distributing the dust collection dust 43 received from the dust discharge port 32 of the bag filter 27 through the inlet 46 to the first outlet 47 and the second outlet 48 at a set ratio. Yes. The distribution of the dust collection dust 43 in the distribution device 45 includes, for example, a state in which the first outlet 47 communicates with the inlet 46 by operation of a switching unit such as a valve or a flap (not shown) provided in the distribution device 45, The state in which the second outlet 48 communicates with the inlet 46 may be switched at a set time interval.

  Needless to say, the distribution of the dust-collecting dust 43 to the first outlet 47 and the second outlet 48 in the distribution device 45 may be performed by a method other than the switching according to the time described above. Although not shown in the drawings, as an example, the distributor 45 separates a certain amount of dust collection dust 43 from the dust collection dust 43 moving from the inlet 46 toward the first outlet 47, and the second outlet 48. It is good also as a structure provided with the means to send to. As another example, the distribution device 45 includes two branch passages communicating with the respective outlets 47 and 48 on the downstream side of the passage for guiding the dust collection dust 43 from the inlet 46, and the sectional area of each branch passage is You may provide the structure used as the set ratio.

  In addition, the dust collection dust 43 sent from the distribution device 45 to the pulverization device 1 via the second outlet 48 is pulverized by the pulverization device 1, and then passes through the circulation line 33 and the circulating material supply nozzle 31 to enter the inlet side flue. 29 is supplied to the combustion exhaust gas 41 that circulates 29. In view of this point, the amount of dust collection dust 43 distributed to the second outlet 48 side, that is, the pulverization device 1 side by the distribution device 45 depends on the capacity of the pulverization device 1 and the combustion flowing through the inlet side flue 29. What is necessary is just to make it determine according to the flow volume and flow velocity of the waste gas 41. FIG.

  The dust collection dust 43 discharged from the first outlet 47 of the distribution device 45 is sent to the ash treatment device 49. The ash treatment device 49 has a function of performing processing similar to dust collection dust processing that is generally performed, such as fixing heavy metals.

  The dust collection dust 43 discharged from the second outlet 48 of the distributor 45 is supplied to the inlet 3 of the pulverizer 1 as a processing target.

  The pulverizing apparatus 1 can pulverize the dust collection dust 43 as the processing target supplied from the inlet 3 in the fluidized bed 7 in the same manner as the processing target 15 in the embodiment.

  By the way, in the bag filter 27, when deposits adhered to the filter cloth 39 are removed by backwashing and taken out as dust collection dust 43 from the dust discharge port 32, soot, unreacted slaked lime 44, reacted slaked lime, etc. Particles may adhere to each other to form flake-like aggregates.

  In the fluidized bed 7 of the pulverizer 1, the agglomerates as described above contained in the dust collection dust 43 can be pulverized, so that the unreacted slaked lime 44 can be exposed to the outside.

  Furthermore, the dust collection dust 43 may contain, for example, reacted slaked lime that reacts with acid gas and forms a salt on the outside. The slaked lime particles can be pulverized to newly expose the unreacted portion inside.

  Thus, when the dust collection dust 43 is pulverized to expose the unreacted slaked lime 44 and the unreacted portion inside the reacted slaked lime, the slaked lime 44 itself has adhesiveness. There is a possibility that particles of slaked lime 44 and particles of dust collection dust 43 in a state where unreacted portions of slaked lime are exposed adhere to the fluidized medium 6 of the fluidized bed 7. Further, in the fluidized bed 7, the unreacted slaked lime 44 particles having adhesion properties and the dust collection dust 43 particles in which the unreacted portions of the slaked lime are exposed are adhered to each other to form an aggregate. there is a possibility.

  However, the pulverization apparatus 1 has a configuration including an injection nozzle 12 for blowing a jet of air 13 toward the surface of the fluidized bed 7, and the fluidized medium 6 to which particles to be treated having adhesion are adhered. The agglomerates in which the particles to be treated having adhering to each other can also be pulverized.

  Therefore, the pulverizing apparatus 1 can suppress the particles of the slaked lime 44 and the particles of the dust collection dust 43 in the state where the unreacted portion of the slaked lime is exposed from adhering to the fluidized medium 6. It is also possible to prevent the particles of the slaked lime 44 and the particles of the dust collection dust 43 in a state where the unreacted portion of the slaked lime is exposed from forming an aggregate between the particles.

  For this reason, when the pulverizing apparatus 1 pulverizes the dust collection dust 43 in the fluidized bed 7, the pulverizing apparatus 1 adheres the particles having adhesive properties as described above, and the particles having adhesive properties to each other. It is possible to suppress the occurrence of poor flow in the fluidized bed 7 due to the aggregation.

  Therefore, the pulverization apparatus 1 more reliably performs the process of pulverizing the dust collection dust 43 to expose the unreacted slaked lime 44 and the process of exposing the unreacted portion inside the reacted slaked lime. Can do.

  When the dust collection dust 43 is pulverized in the fluidized bed 7 to become a dust pulverized product 43a having a smaller particle diameter, and the flowing air 10 and the air 13 are conveyed by the airflow flowing toward the outlet 4, The dust pulverized product 43 a is discharged from the outlet 4 together with the flowing air 10 and the air 13.

  As shown in FIG. 6, the pulverizer 1 includes an air supply side of a blower 11 that supplies air 10 for flow to a wind box 8 and an air supply of an air supply unit 14 that supplies air 13 to an injection nozzle 12. The air intake side of the device 24 is preferably connected to the outlet side flue 42 via the exhaust gas intake line 50. According to this configuration, as the flow air 10 in the fluidized bed 7 and the jet forming air 13 supplied to the injection nozzle 12, the exhaust gas 41 a after passing through the bag filter 27 and being purified is circulated. Can be used. Accordingly, there is no need for a supply source of the flow air 10 and air 13 and a filter for preventing dust and the like from being mixed into the flow air 10 and air 13, and it is sent to the downstream side of the outlet side flue 42. The amount of the exhaust gas 41a does not increase by the amount of the flowing air 10 and the air 13.

  Further, among the acidic gas contained in the combustion exhaust gas 41, even if the acidic gas that could not be removed by absorption by the slaked lime 44 remains in the exhaust gas 41a, it is circulated as the flowing air 10 and the air 13. The acidic gas contained in the exhaust gas 41 a can be absorbed and efficiently brought into contact with the unreacted slaked lime 44 exposed by the pulverization process of the dust collection dust 43 in the pulverizer 1. Therefore, the exhaust gas 41a that is used as the flow air 10 and the air 13 can be cleaned by further removing the acidic gas.

  The dust pulverized product 43a discharged together with the flow air 10 and the air 13 from the outlet 4 of the pulverizer 1 is sent to the circulatory supply nozzle 31 via the circulation line 33. From the circulatory product supply nozzle 31, the inlet side flue 29 Is blown into the combustion exhaust gas 41 circulating. As a result, the unreacted slaked lime 44 contained in the dust pulverized product 43a and the unreacted portion where the reacted slaked lime is newly exposed after being pulverized are absorbed with the acidic gas in the combustion exhaust gas 41. .

  Thus, according to the exhaust gas treatment device 26 of the present embodiment, a part of the unreacted slaked lime 44 contained in the dust collection dust 43 discharged from the bag filter 27 is removed from the acidic gas in the combustion exhaust gas 41. It can be used effectively for absorption. Further, even if the reacted slaked lime contained in the dust collection dust 43 is pulverized and can newly expose the unreacted portion, it is effective in absorbing the acidic gas in the combustion exhaust gas 41. Can be used.

  In addition, since the exhaust gas treatment device 26 of the present embodiment includes the pulverization device 1, the exhaust gas treatment device 26 includes a function of pulverizing the dust collection dust 43 and an unreacted slaked lime 44 and an unreacted portion of slaked lime exposed. It is possible to obtain a function of separating the dust pulverized material 43a from the unpulverized dust collection dust 43 and the pulverized material that has not been sufficiently pulverized and sending the dust pulverized material 43a to the circulating material supply nozzle 31 of the inlet side flue 29.

  At this time, even if the unreacted slaked lime 44 or the unreacted part newly exposed from the reacted slaked lime has adhesiveness, the pulverizing apparatus 1 causes the fluidized bed 7 to adhere to the adhesiveness. The dust collection dust 43 can be pulverized in a state in which the occurrence of poor flow is suppressed.

  Note that the pulverization apparatus and the exhaust gas treatment apparatus of the present disclosure are not limited to the above embodiment.

  In the pulverizing apparatus 1 shown in FIGS. 1 to 5 (a) and 5 (b), the fluidized medium 6 descends at a position where the processing target 15 supplied from the inlet 3 falls into the fluidized bed 7, and leaves the position. If the circulating medium 6 rises at the above position, the number of divided sections for causing a difference in the flow rate and flow velocity of the flowing air 10 in the wind box 8 is two or four. It may be the above. In the fluidized bed 7, the pulverizing apparatus 1 is configured such that, for example, the fluidized medium 6 descends at the center of the container 2 and the fluidized medium 6 ascends at the outer periphery according to the position where the processing target 15 is dropped and supplied. Alternatively, a circulating flow other than that shown in FIG. 1 may be generated, such as a circulating flow in which the fluid medium 6 rises at the center of the container 2 and the fluid medium 6 descends at the outer periphery. In this case, the pulverizer 1 may appropriately change the arrangement of the divided sections provided in the wind box 8 according to the arrangement of the circulation to be generated.

  The function of causing the flow rate and flow rate of the flow air 10 to be blown from below into the layer of the fluid medium 6 from the wind box 8 through the dispersion plate 5 in the pulverizer 1 is, for example, that the dispersion plate 5 has an aperture ratio. You may implement | achieve by means other than the structure provided with division | segmentation division 19a, 19b, 19c in the wind box 8, such as setting it as a structure provided with a different area | region.

  In the exhaust gas treatment device 26 shown in FIG. 6, the dimensions of the bag filter 27, the distributor 45, and the pulverizer 1 and the dimensional ratios thereof are for convenience of illustration, and do not reflect actual dimensions. .

  Further, if the exhaust gas treatment device 26 can supply a part of the dust collection dust 43 discharged from the dust discharge port 32 of the bag filter 27 to the inlet 3 of the pulverizing device 1, the exhaust gas treatment device 26 is upstream of the inlet 3. It is good also as a structure provided with storage means like a hopper and a bottle which temporarily stores the dust collection dust 43 in the side.

  The arrangement of each device in the exhaust gas treatment device 26 shown in FIG. 6 is for convenience of illustration, and does not reflect the actual arrangement.

  In the exhaust gas treatment device 26, the chemical for absorbing acidic gas is exemplified by slaked lime 44. However, for example, a chemical other than slaked lime may be used as long as it is a chemical conventionally used for absorbing acidic gas, such as a chemical containing sodium. May be.

  In the exhaust gas treatment device 26, the dust collector exemplifies the bag filter 27. However, the solid particles in the combustion exhaust gas 41 are collected in a dry manner, and the collected solid particles are taken out as dust collection dust 43 from the dust discharge port. If possible, a dust collector other than the bag filter 27 may be employed.

  In the exhaust gas treatment device 26, the flowing air 10 and air 13 supplied to the pulverization device 1 are preferably used by circulating the exhaust gas 41a, but the exhaust gas 41a may not be used. In this case, the suction side of the blower 11 and the suction side of the air supply device 24 may be external air intakes each provided with a filter, or may be connected to a clean air supply unit.

  The arrangement of the medicine supply nozzle 30 and the circulating material supply nozzle 31 provided in the inlet side flue 29 may be reversed from the order shown in FIG. 6 from the upstream side. The nozzles 30 and 31 may be arranged in the circumferential direction in the inlet side flue 29.

  The exhaust gas treatment apparatus of the present disclosure may include a function of adsorbing and removing dioxins contained in the combustion exhaust gas 41 by providing the inlet side flue 29 with a nozzle that supplies activated carbon. According to this configuration, a part of the activated carbon contained in the dust collection dust 43 is pulverized by the pulverizer 1 to expose a new surface, and then is circulated and supplied to the inlet-side flue 29 for combustion exhaust gas. It can be effectively used for adsorption of dioxins and the like in 41.

  As long as the exhaust gas treatment device of the present disclosure is a combustion exhaust gas 41 that may contain an acidic gas, the combustion exhaust gas 41 discharged from any combustion device other than the waste incinerator may be treated.

  In addition, it goes without saying that various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Crusher 2 Container 3 Inlet 4 Outlet 5 Dispersing plate 6 Fluid medium 7 Fluidized bed 8 Air box 10 Flowing air 11 Blower 12 Injection nozzle 13 Air 14 Air supply part 15 Process object 25 Concave part 27 Bag filter (dust collector)
28 Gas inlet 29 Inlet side flue 30 Drug supply nozzle 31 Circulating product supply nozzle 32 Dust discharge port 33 Circulation line 41 Combustion exhaust gas 43 Dust collection dust

Claims (4)

A container,
An inlet to be treated provided on the upper end side of the container;
An outlet provided on the upper end side of the container;
A dispersion plate provided at a lower position of the container;
A fluid medium packed above the dispersion plate;
An air box provided below the dispersion plate;
A flow air blower connected to the air box;
In the container, an injection nozzle provided in a position facing the fluidized bed at a position above the fluidized bed formed by blowing the fluidizing air from below through the dispersion plate into the fluidized medium. When,
An air supply unit for supplying air to the spray nozzle. A plurality of the injection nozzles,
The spray nozzles are arranged such that a plurality of recesses formed on the surface of the fluidized bed according to the number of the spray nozzles do not overlap each other when the jet of air sprayed from the spray nozzles is blown. Item 2. A grinding apparatus according to Item 1. The pulverization apparatus according to claim 2, wherein the spray nozzle is disposed so that a distance between the plurality of recesses formed on the surface of the fluidized bed is equal to or less than ½ of a radius of the recesses. A dust collector,
An inlet side flue connected to the gas inlet of the dust collector and leading the combustion exhaust gas to the gas inlet;
A medicine supply nozzle and a circulation supply nozzle provided in the inlet side flue;
A dust discharge port for discharging dust collection dust from the dust collector;
A crushing device,
The grinding device
A container,
An inlet to be treated provided on the upper end side of the container;
An outlet provided on the upper end side of the container;
A dispersion plate provided at a lower position of the container;
A fluid medium packed above the dispersion plate;
An air box provided below the dispersion plate;
A flow air blower connected to the air box;
In the container, an injection nozzle provided in a position facing the fluidized bed at a position above the fluidized bed formed by blowing the fluidizing air from below through the dispersion plate into the fluidized medium. When,
An air supply unit for supplying air to the spray nozzle,
An exhaust gas treatment apparatus comprising: the dust discharge port connected to the inlet of the pulverizer; and the outlet of the pulverizer connected to the circulating material supply nozzle via a circulation line.

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