JP6090618B1 - Fly ash classification device, fly ash classification method, and production method of spherical fly ash particles - Google Patents

Abstract

A classification device and a classification method for classifying fly ash with high accuracy are provided. A classifier 2 for classifying fly ash, an introduction part for introducing fly ash into the classifier 2, a lead-out part for deriving light fly ash from the classifier 2, and a heavy fly ash being discharged from the classifier 2 And a discharge side connection hole 6 provided in the connection part between the classifier 2 and the introduction part, and a lead-out connection hole 7 provided in the connection part between the classifier 2 and the lead-out part. 2 and the discharge side connection hole 19 provided in the connection part of the discharge part 5, and the introduction side connection hole is located at a position where the fly ash introduced from the introduction side connection hole 6 in the classifier 2 collides. 6 is provided with a pulverized body in which fly ash introduced from 6 collides and rebounds, and in the classifier 2, a discharge side space in which heavy fly ash is present at a position below the crushed body, and other positions of the crushed body To fly the light fly ash And a flow side space for movement. [Selection] Figure 1

Description

  The present invention relates to a fly ash classification apparatus for classifying fly ash, a fly ash classification method, and a method for producing spherical fly ash particles.

  Conventionally, it has been proposed to effectively use fly ash (coal ash) produced as a by-product in a coal-fired power plant as a concrete admixture.

  Here, in the fly ash, porous unburned carbon discharged in a state of incomplete combustion without reaching the melting point remains in spherical particles in which ash is melted and solidified by complete combustion. It is known that the remaining unburned carbon adversely affects the fresh properties of concrete.

  Therefore, a method for reducing the unburned carbon content of coal ash has been proposed (see Patent Document 1). In this method, coal ash containing unburned carbon is put into a dry pulverizer, the unburned carbon in the coal ash is crushed and pulverized, and then pulverized by putting it into a dry classifier. It is said that unburned carbon can be separated.

JP 2010-30885 A

However, the method described above, large-scale apparatus has been necessary to use a classifier and a pulverizer. For this reason, a device for obtaining fly ash spherical particles in a more compact manner has been demanded.
The present invention has been made in view of the above-mentioned demand, and provides a fly ash classification device, a fly ash classification method, and a method for producing spherical fly ash particles that can obtain desired spherical particles in a compact configuration. Objective.

  The present invention relates to a classifier for classifying fly ash, an introduction unit connected to the classifier for introducing fly ash to the classifier, and a light fly ash classified by the classifier from the classifier. And a discharge part for discharging the heavy fly ash classified by the classifier from the classifier, an introduction side connection hole provided in a connection part of the classifier and the introduction part, and A lead-out side connection hole provided in a connecting portion between the classifier and the lead-out portion is provided above a discharge-side connection hole provided in a connecting portion between the classifier and the discharge portion, and the inside of the classifier At a position where the fly ash introduced from the introduction side connection hole collides, a pulverized body in which the fly ash introduced from the introduction side connection hole collides and rebounds is provided, and in the classifier, the crushed object Heavy at the lower position A discharge-side space to be present fly ash, characterized in that the lighter fly ash at other positions of the solutions 砕体 a classification apparatus that includes a fluid side space to flow to the outlet section.

  According to the present invention, an apparatus and a method for classifying fly ash with high accuracy can be provided.

The partial cross section front view of a classification device. Explanatory drawing explaining the plane of a flange part and a cover body. Explanatory drawing explaining the front and right side of a crushing board. FIG. 6 is a longitudinal front view schematically explaining the operation of the classification device. The cross-sectional top view which illustrates typically operation | movement of a classification apparatus.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

  FIG. 1 is a partial cross-sectional front view of a fly ash classification device 1, FIG. 2 (A) is a plan view showing the arrangement of a flange portion 11 and a crushing plate 10, and FIG. FIG. 3A is a plan view of the lid 9, FIG. 3A is a partial sectional front view around the crushing plate 10 fixed to the lid 9, and FIG. 3B is fixed to the lid 9. FIG.

  The classifier 1 includes a classifier 2 that performs classification, an introduction pipe 3 that introduces a gas containing fly ash into the classifier 2, a lead-out pipe 4 that derives fly ash of classified fine particles, and classified coarse particles The discharge part 5 which discharges the fly ash is provided.

<Introduction pipe>
The introduction tube 3 has a hollow cylindrical shape, and is formed in a cylindrical shape in this embodiment. One end of the introduction pipe 3 is connected to the outer side of the peripheral wall of the classifier 2 and communicates with an introduction-side connection hole 6 having the same diameter as the inner diameter of the introduction pipe 3 formed on the peripheral wall of the classifier 2. .

  The central axis of the introduction pipe 3 is horizontal and faces the central axis of the classifier 2. That is, the introduction pipe 3 is disposed so that the horizontal flow path is directed to the left and right center position of the classifier 2 when viewed from the flow direction.

  The introduction pipe 3 is connected to a pump (not shown), and introduces gas including fly ash before classification to be supplied into the classifier 2.

<Derived pipe>
The lead-out tube 4 has a hollow cylindrical shape, and is formed in a cylindrical shape in this embodiment. One end of the outlet pipe 4 is connected to the outer side of the peripheral wall of the classifier 2 and communicates with the outlet side connecting hole 7 having the same diameter as the inner diameter of the outlet pipe 4 formed on the peripheral wall of the classifier 2. .

  The central axis of the outlet pipe 4 is horizontal and faces the central axis of the classifier 2. That is, the outlet pipe 4 is disposed so that the horizontal flow path is directed to the left and right center position of the classifier 2 when viewed from the direction opposite to the flow direction. The central axis of the outlet pipe 4 coincides with the central axis of the introduction pipe 3. Therefore, it arrange | positions so that it may be connected in a straight line from the inlet tube 3 to the outlet tube 4, and the classifier 2 is arrange | positioned between the inlet tube 3 and the outlet tube 4 connected to this straight line.

  The cross-sectional area of the outlet pipe 4 is substantially equal to the cross-sectional area of the introduction pipe 3. For this reason, the flow velocity of the gas including the fly ash of classified fine particles flowing in the outlet tube 4 is substantially equal to the flow velocity of the gas including fly ash flowing in the inlet tube 3.

<Classifier>
The classifier 2 includes a cylindrical casing 8, a lid body 9 provided on the casing 8, and a crushing plate 10 fixed to the lid body 9.

  The housing 8 is hollow inside and is formed in a cylindrical shape in this embodiment. The central axis of the housing 8 is oriented in the vertical direction and is long in the vertical direction. The length of the casing 8 in the vertical direction is longer than the inner diameter of the casing 8. The horizontal cross-sectional area of the housing 8 is at least twice the radial cross-sectional area of the introduction pipe 3 and at least twice the radial cross-sectional area of the outlet pipe 4. The introduction side connection hole 6 and the lead-out side connection hole 7 described above are provided in the upper peripheral wall of the housing 8. The introduction side connection hole 6 and the outlet side connection hole 7 are provided to face the peripheral wall of the housing 8 with the central axis of the housing 8 interposed therebetween. A flange portion 11 is provided at the upper end of the housing 8 so as to project outward from the peripheral wall of the housing 8.

  As shown in FIG. 2A, the flange portion 11 has a ring shape, and a plurality of bolt insertion holes 12 penetrating in the vertical direction are formed at equal intervals along the outer periphery. A lid body 9 is placed and fixed on the upper surface of the flange portion 11 (see FIG. 1).

  As shown in FIG. 2B, the lid body 9 has a plate shape, and is formed in a disk shape in this embodiment. The outer periphery of the lid body 9 is formed along the outer periphery of the flange portion 11 described above. A bolt insertion hole 12 a penetrating in the vertical direction for passing the bolt 13 is formed at a position corresponding to the bolt insertion hole 12 of the flange portion 11 in the peripheral portion of the lid body 9.

  The lid body 9 is fixed to the housing 8 by bolts 13 and nuts 14 (see FIG. 1) inserted into the bolt insertion holes 12 of the lid body 9 and the bolt insertion holes 12a of the flange portion 11. A handle 15 is attached to the upper surface of the lid body 9, and a crushing plate 10 is fixed to the lower surface of the lid body 9.

  As shown in FIG. 3A, the crushing plate 10 includes a crushing plate main body 16, a collision plate 17, and a support plate 18.

  The crushing plate main body 16 has a plate shape having a flat surface. In addition, you may form the crushing board main body 16 in other shapes, such as the plate shape curved around the axis | shaft of an up-down direction. In this case, fly ash can be rebounded.

  As shown in FIG. 3B, in this embodiment, the crushing plate body 16 is formed of a substantially rectangular flat plate. The upper side 16 a of the crush plate main body 16 is fixed to the lower surface of the lid body 9 along the diameter of the lid body 9. The crushing plate main body 16 hangs substantially vertically from the lower surface of the lid body 9. The midpoint of the upper side 16 a is located at the center of the lid body 9. The width of the crushing plate main body 16 is smaller than the inner diameter of the housing 8, and the left and right sides 16 b of the crushing plate main body 16 are separated from the peripheral wall 8 a of the housing 8.

  The vertical width of the crushing plate main body 16 is smaller than the vertical width of the housing 8. The lower side 16c of the crushing plate main body 16 is positioned above a discharge side connection hole 19 (described later) provided at the lower end of the housing 8, and is largely separated from the discharge side connection hole 19. The distance from the lower side 16c of the crushing plate main body 16 to the discharge side connecting hole 19 is longer than the height of the crushing plate main body 16, and is formed twice or more longer. The height position of the lower side 16 c of the crushing plate main body 16 is at a height position that is ½ or more of the vertical width of the housing 8. On the other hand, the lower side 16 c of the crushing plate body 16 is positioned below the lower ends of the introduction side connection hole 6 and the outlet side connection hole 7.

  Returning to FIG. 3A, the collision plate 17 has a plate shape, and is formed in a substantially rectangular shape in this embodiment (see FIG. 3B). The collision plate 17 is provided so as to be bonded to the surface of the crushing plate main body 16.

  As shown in FIG. 3A, the collision plate 17 faces the peripheral wall 8 a of the housing 8 including the introduction side connection hole 6. The lower side 17c of the collision plate 17 is positioned below the lower end of the introduction side connection hole 6 as shown in FIG. The collision plate 17 is formed such that the upper side 17 a is positioned above the upper end of the introduction side connection hole 6 and the lateral width is longer than the diameter of the introduction side connection hole 6. The height position of the center of the collision plate 17 is set to a position that is coincident with or slightly lower than the height position of the center of the introduction side connection hole 6. The surface area of the collision plate 17 is larger than the area of the introduction-side connecting hole 6 (cross-sectional area of a cross section perpendicular to the fly ash introduction direction) (see FIG. 3B). Therefore, the introduction-side connection hole 6 and the collision plate 17 are arranged so that the introduction-side connection hole 6 is within the surface of the collision plate 17 when viewed in the fly ash introduction direction. The collision plate 17 and the introduction pipe 3 are arranged so that the normal direction of the collision plate 17 and the introduction direction of fly ash from the introduction side connection hole 6 are coincident or parallel to each other. The collision plate 17 is made of wear-resistant steel. Therefore, the collision plate 17 is less likely to be deteriorated due to wear. The collision plate 17 is attached by screwing the four corners to the crushing plate main body 16 (see FIG. 3B). This makes it easy to replace the collision plate with a new one when a failure occurs in the collision plate.

  The support plate 18 is provided on the back surface of the crush plate main body 16 as shown in FIG. The support plate 18 is a right triangle plate having two right angles, and the two sides are fixed to the back surface of the crush plate main body 16 and the lower surface of the lid body 9. And the support plate 18 is perpendicular | vertical with respect to both the back surface of the crushing board main body 16 and the lower surface of the cover body 9 (refer FIG. 2 (A)). In addition, two support plates 18 are provided apart from each other in the width direction of the crushed body main body 16 (see FIG. 2A). By these support plates 18, the crush plate main body 16 is less likely to be deformed or distorted by an external force from the surface side. In addition, it can also be set as the appropriate support body which prevents the deformation | transformation and inclination of the disintegration body main body 16 by the collision of fly ash, or airflow, such as using a support | pillar instead of the support plate 18. FIG. That is, both ends of the column can be fixed to the back surface of the crush plate main body 16 and the lower surface of the lid body 9.

  As described above, the crushing plate 10 is fixed to the lid body 9. Therefore, when the bolt 13 for fixing the lid body 9 to the classifier 2 is removed and the lid body 9 is removed from the classifier 2, the crushing plate 10 can be removed at the same time. Thereby, the inside of the classifier 2 can be easily inspected and cleaned, and the crushing plate 10 can be inspected and the collision plate 16 can be replaced at the same time, which is efficient.

  Moreover, when attaching the lid body 9 to the classifier 2, the corresponding positions of the lid body 9 and the bolt insertion holes 12 and 12a of the flange portion 11 that are vertically aligned are changed so as to rotate in plan view, thereby The arrangement angle can be changed. That is, the angle of the front surface of the collision plate 17 can be changed around the central axis of the classifier 2. Thereby, the flow direction opposing arrangement in which the fly ash introduced from the introduction pipe 3 to the classifier 2 is bounced back in front, and the flow direction inclined arrangement in which the introduced fly ash is bounced at an angle in the radial direction of the axis of the classifier 2. Can be set to either of these. In the case of the tilted arrangement in the flow direction, the gas performs a swiveling motion. Thereby, centrifugal force is applied to the fly ash contained in the gas, and separation of heavy fly ash and light fly ash can be promoted.

<Discharge unit>
As shown in FIG. 1, the discharge unit 5 is provided at the lower end of the classifier 2 through the discharge side connection hole 19. The discharge portion 5 includes a first cylindrical body 20 whose inner diameter gradually decreases as it goes downward, and a second cylindrical body 21 connected to the lower end of the first cylindrical body 20. . In this embodiment, the first cylindrical body 20 is an inverted frustoconical cylindrical body, and the second cylindrical body 21 is a cylinder.

<Internal space of classifier>
As shown in FIG. 4, the internal space of the classifier 2 is divided into the following three regions having different main functions.

(1) Horizontal crushing region 22
Surrounded by a plane including the surface of the crushing plate 10, a peripheral wall 8 a of the housing 8 including the introduction-side connecting hole 6, a lower surface of the lid 9, and a horizontal plane at the position of the lower side 10 c of the crushing plate 10. region.
(2) Pre-target fly ash derivation area 23
Surrounded by a plane including the back surface of the crushing plate 10, a peripheral wall 8 a of the housing 8 including the lead-out side connecting hole 7 facing the lower surface of the lid 9, and a horizontal plane at the position of the lower side 10 c of the crushing plate 10. region.

(3) Sedimentation stirring area 24
A region surrounded by a horizontal plane at the position of the lower side 10 c of the crushing plate 10, a horizontal plane including the discharge side connecting hole 19, and the peripheral wall 8 a of the housing 8.

  As shown in FIG. 5, the crushing plate 10 has its left and right sides 10 b separated from the peripheral wall 8 a of the housing 8. For this reason, the gap between the left and right sides 10b of the crushing plate 10 and the peripheral wall 8a of the casing 8 facing the two horizontal communication ports 25 that communicate the horizontal crushing region 22 and the target fly ash derivation region 23. (Horizontal communication area) is formed.

  The total area of the two horizontal communication ports 25 is set to be approximately the same as the area of the introduction-side connecting hole 6 or approximately the same as the cross-sectional area in the radial direction of the introduction pipe 3. Thus, the gas containing the fly ash flowing in the horizontal crushing region 22 and the region before target fly ash derivation 23 has a flow velocity in the region including the fly ash before classification introduced from the introduction side connection hole 6. It becomes almost equal to the introduction flow rate. The total area of the two horizontal communication ports 25 can be 0.5 to 2 times the area of the introduction side connecting hole 6 or the radial sectional area of the introduction pipe 3. Five times is preferable, and an equal area is preferable. The area of the horizontal communication port 25 here refers to the area of the range where gas flows. That is, for example, when the horizontal communication port 25 is provided 10 times longer upward, it does not include a region where the gas in the upper part does not flow so much (a region where the gas does not flow or the flow rate of the gas becomes slow). The region where the gas flow rate is slow can be a region where the gas flow rate is 50% or less with respect to the maximum flow rate at the horizontal communication port 25, and is preferably 60% or less. % Or less, more preferably 80% or less, and more preferably 90% or less.

  Further, the boundary surface between the horizontal crushing region 22 and the settling / stirring region 24 forms a semicircular introduction-side vertical communication port 26 (introduction-side vertical communication region) that connects these two regions.

  Similarly, the boundary surface between the target fly ash derivation region 23 and the sedimentation stirring region 24 forms a derivation-side vertical communication port 27 (derivation-side vertical communication region) having a semicircular view in plan view that connects these two regions.

The classifier 1 configured as described above operates as follows.
As shown in FIG. 4, the gas containing the fly ash before classification flows in the horizontal direction in the introduction pipe 3 toward the crushing plate 10 in the classifier 2 as indicated by an arrow Y1.

  The flow rate of the gas including the fly ash before classification that flows in the introduction pipe 3 is about 20 meters per second. This flow rate can be about 10 to 40 meters per second, preferably 15 to 30 meters per second, and preferably about 20 meters per second.

  The gas containing fly ash before classification that has flowed through the introduction pipe 3 is introduced into the classifier 2 through the introduction side connection hole 6. The gas including the fly ash before classification introduced into the classifier 2 flows along the extension of the central axis of the introduction pipe 3 while maintaining the horizontal direction, as indicated by an arrow Y2. That is, the gas including the fly ash before classification introduced into the classifier 2 becomes a horizontal flow and travels toward the collision plate 17 of the crushing plate 10 of the classifier 2. The gas passes through the horizontal communication ports 25 on the left and right sides of the crushing plate 10 as shown by the arrow Y3 (see FIG. 5) and enters the region 23 before the target fly ash derivation, and is introduced as shown by the arrow Y4. It is divided into those passing through the side vertical communication port 26 and heading toward the sedimentation stirring region 24 below the crushing plate 10.

  The fly ash before classification that has been transported in this way advances straight without flowing to the left and right as the heavier, and collides with the collision plate 17 of the crushed body 10 almost vertically. That is, most of the fly ash before classification that is vigorously introduced into the classifier 2 from the introduction pipe 3 through the introduction side connection hole 6 flows toward the collision plate 17 and collides with the collision plate 17. At the time of this collision, the clusters included in the fly ash before classification, and those in which impurities and fly ash are combined are crushed by the impact force received from the collision plate 17, and a plurality of single particles having different particle sizes are separated. Separated into fly ash and impurities. Furthermore, the fly ash which collided reverses the flow direction, and collides with the fly ash before the subsequent classification introduced from the introduction pipe 3 to the classifier 2 almost in front. Thereby, the disintegration of fly ash is further promoted.

  Introducing vigorously means that when it is introduced, it does not fall straight down due to gravity but goes straight in the direction of conveyance due to the inertial force conveyed by the gas, or it goes down little by little due to gravity while moving straight forward It means to introduce a parabola by changing the direction.

  Most of the fly ash that collided with the subsequent fly ash before classification falls downward, and impurities such as fly ash particles having a large particle size and unburned carbon are transferred from the introduction side vertical communication port 26 to the settling and stirring region 24. It flows and gathers in the discharge part 5 as shown by the arrow Y5.

  As shown in FIG. 4, the gas containing fly ash that has flowed to the sedimentation stirring region 24 through the introduction-side vertical communication port 26 has the introduction-side vertical communication port 26 side in the sedimentation stirring region 24 as indicated by an arrow Y4. Rotate downward so that the outlet side vertical communication port 27 side moves upward as indicated by an arrow Y6. During this time, the fly ash comes into contact with each other and is further crushed, while the heavy one is stored downward, and the light one is led out to the outlet-side vertical communication port 27 as indicated by an arrow Y6. That is, fly ash particles having an average particle size of 2 to 3 μm (that is, one type of fly ash particles), which is a necessary size to which unburned carbon formed by collision and crushing is not attached, are conveyed by gas flow. Then, it is conveyed from the outlet-side vertical communication port 27 to the outlet-side connecting hole 7.

  In addition, 1 type corresponds to fly ash particles having an average particle size of 2 to 3 μm, 2 types correspond to fly ash particles having an average particle size of 10 to 20 μm, and 4 types correspond to fly ash particles having an average particle size of 30 to 60 μm. Refers to fly ash particles.

  On the other hand, among the fly ash before classification introduced into the classifier 2, light ones, that is, fly ash particles having an average particle diameter of 2 to 3 μm, which is a necessary size to which unburned carbon is not attached, As shown by the arrow Y3 at the same speed as the flow velocity that has been introduced, the gas flows through the horizontal communication port 25 (see FIG. 5) together with the gas flowing through the horizontal communication port 25, and is derived from the target fly ash deriving region 23 at the same speed. It is conveyed to the tube 4.

  The target fly ash derivation region 23 passes through the derivation-side vertical communication port 27, passes through the derivation-side vertical communication port 27, passes through the horizontal communication port 25, and the fly ash (spherical fly ash particles of the target size) with a small particle size. The small and light fly ash (spherical fly ash particles of the desired size) entering from the side are mixed and become turbulent, and are led out from the lead-out side connecting hole 7 as shown by the arrow Y7 and lead out pipe 4 It flows in and is conveyed out of the classifier 2 as indicated by an arrow Y8.

  Here, the horizontal cross-sectional area of the housing 8 is at least twice the cross-sectional area of the introduction pipe 3 in the radial direction. Therefore, the flow velocity of the gas containing fly ash that has flowed to the sedimentation stirring region 24 through the introduction-side vertical communication port 26 is the gas containing fly ash before classification immediately after being introduced into the classifier 2 through the introduction pipe 3. The speed is about 6.6 meters per second in the vicinity of the introduction-side vertical communication port 26, and is smaller at the lower part of the classifier 2 and about 3.3 meters per second. In addition, by changing the ratio of the horizontal cross-sectional area of the casing 8 and the cross-sectional area in the radial direction of the introduction pipe 3, it is possible to adjust these flow rates of the gas containing fly ash flowing in the settling / stirring region 24. .

  In addition, the fly ash before classification introduced into the classifier 2 through the introduction pipe 3 is not only spherical glassy single particle fly ash having different particle sizes but also a plurality of single particle fly ash having different particle sizes. It also contains many fly ash of clustered particles that are clustered like bunches. Further, the fly ash before classification may contain impurities, and there may be a combination of impurities and fly ash.

  As described above, the casing 8 is set so that the flow rate in the sedimentation stirring region 24 is 1/2 or less, more specifically about 1/3 of the flow rate when introduced from the introduction pipe 3. By designing the size of the horizontal cross-sectional area (and the volume of the settling and stirring region 24), the fly ash, which is fine particles having a desired particle size or less, is derived from the outlet tube 4, and coarse particles larger than the desired particle size are obtained. And sediment.

  Heavy fly ash accumulated in the lower part of the classifier 2 accumulates in the discharge part 5. The heavy fly ash accumulated in the discharge unit 5 is connected to the lower end of the discharge unit 5 and is provided with dampers 28 and 29 that can be opened and closed on the upper end and the lower side, respectively. Discharged. More specifically, first, the upper end damper 28 is opened with the lower damper 29 closed. Thereby, the heavy fly ash accumulated in the discharge part 5 is dropped and moved to the space above the lower damper 29. Next, the upper end damper 28 is closed, and the lower damper 29 is opened in this state. As a result, the heavy fly ash containing the impurities in the space up to the upper end damper 28 on the lower damper 29 falls and is discharged out of the classifier 2. By repeating the above-described series of discharging operations, heavy fly ash containing impurities can be continuously discharged out of the classifier 2. Further, by increasing or decreasing the number of discharging operations, it is possible to control the discharge amount of heavy fly ash containing impurities. As a result, the fly ash discharged from the lower damper 29 is equivalent to four types of fly ash.

  With the above-described configuration and operation, the classification device 1 is not limited to the spherical glassy single particle fly ash with different particle sizes, but also includes the fly ash of cluster-like particles and the combination of impurities and fly ash. The fly ash can be introduced into the classifier 2 from the introduction tube 3 and crushed in the classifier 2.

  Then, the classifier 1 can derive light fly ash particles having a small particle diameter from the outlet tube 4 for the crushed fly ash, and can discharge heavy fly ash particles having a large particle diameter from the discharge unit 5. Ash classification is possible.

  The classifier 1 is provided with an introduction side connection hole 6 and a discharge side connection hole 7 above the discharge side connection hole 19. Therefore, the heavy fly ash introduced into the gas through the introduction side connection hole 6 and the heavy fly ash crushed in the post-introduction classifier 2 are affected by gravity, and the lower discharge side On the other hand, light fly ash, which has been settling toward the connection hole 19 and introduced or crushed in the same manner, rides on the gas flow and flows toward the discharge-side connection hole 7. To do. For this reason, it is not necessary to newly apply a special external force, and the structure of the apparatus is simplified.

  The crushing plate 10 is disposed in the classification chamber 2 at a position where the fly ash before classification introduced from the introduction side connecting hole 6 collides. Therefore, the fly ash introduced from the introduction side connection hole 6 collides with the crushing plate 10 and rebounds. As a result, the fly ash introduced from the introduction side connection hole 6 rides on the high-speed straight gas flow immediately after being introduced into the classifier 2 and is hardly classified, while leaving the classification, the discharge side connection hole 7. There is little fear that it will be derived as it is. On the other hand, since the fly ash collides with the collision plate 17 provided in the crushing plate 10 by riding on a high-speed straight gas flow immediately after being introduced into the classifier 2, the solution of the fly ash Crushing can be done efficiently.

  In the classifier 2, a discharge side space (sedimentation stirring region 24) where heavy fly ash exists at a lower position of the crushing plate 10 and light fly ash flows to the outlet pipe 4 at other positions of the crushing plate 10. The flow side space (horizontal crushing area | region 22 and the area | region 23 before the target fly ash derivation | leading-out (including the horizontal communicating port 25)) to be made is formed.

  As a result, the gas containing heavy fly ash that has flowed to the sedimentation stirring region 24 through the introduction-side vertical communication port 26 is moved downward in the sedimentation stirring region 24, while the introduction-side vertical communication port 26 side is directed downward. Rotates so that the side moves upward. As a result, centrifugal force is applied to the heavy fly ash contained in the gas, and the heavy fly ash tends to flow toward the lower discharge side connection hole 19, thereby improving the capture efficiency of the heavy fly ash.

  On the other hand, in the flow side space (the horizontal crushing region 22 and the target fly ash derivation region 23 (including the horizontal communication port 25)), the light fly ash is directed from the horizontal crushing region 22 through the horizontal communication port 25. Since it flows smoothly on the horizontal flow in the region 23 before derivation of fly ash, the collection efficiency of light fly ash is increased.

  The crushing plate 10 is formed such that the area of the collision plate 17 serving as the introduction side facing surface facing the introduction side coupling hole 6 is wider than at least one of the introduction side coupling hole 6 and the outlet side coupling hole 7. Thereby, most of the fly ash before classification introduced from the introduction side connection hole 6 collides with the collision plate 17, so that the fly ash crushing efficiency is increased.

  The flow velocity in the gas classifier of light containing light fly ash flowing in the flow side space (horizontal communication port 25) is 0 of the flow velocity of introduction of gas containing fly ash before classification introduced from the introduction side connection hole 6. .5 to 2 times. Therefore, fluctuations in the gas flow and the atmospheric pressure in the horizontal crushing region 22 and the region 23 before deriving the target fly ash can be suppressed to a low level. In addition, turbulent flow is less likely to occur in the settling and stirring region 24 in contact with the horizontal crushing region 22 and the target fly ash derivation region 23, and fly ash classification can be performed more smoothly.

  The area of the entrance of the discharge side space, that is, the area of the introduction side vertical communication port 26 is formed wider than the area of the introduction side connection hole 6. Therefore, the flow rate of the gas including heavy fly ash flowing from the horizontal pulverization region 22 to the settling stirring region 24 through the introduction side vertical communication port 26 is the fly ash before classification introduced from the introduction side connection hole 6. It becomes slower than the introduction flow rate of the gas containing. Therefore, classification of heavy fly ash (coarse particles) is started in the vicinity of the introduction-side vertical communication port 26 at the top of the settling and stirring region 24. On the other hand, in the lower part of the settling / stirring region 24 far from the introduction-side vertical communication port 26, the flow of gas hardly occurs and the settling of heavy fly ash is not easily disturbed. Therefore, in the lower part of the sedimentation stirring region 24, the concentration and further deposition of heavy fly ash proceed smoothly.

  The inner wall of the classifier 2 is formed in an arc shape in which a portion from the inlet side connecting hole 6 to the outlet side connecting hole 7 in the side wall portion is convex outward, and flows between the crushing plate 10 and the arc shaped portion. Side spaces (horizontal crushing region 22 and target fly ash derivation region 23 (including horizontal communication port 25)) are provided. Therefore, in the horizontal crushing region 22, the fly ash after colliding with the collision plate 17 is the center of the horizontal crushing region 22 due to the subsequent collision with the peripheral wall 8 a of the arcuate casing 8 and the crushing plate 10. Flow smoothly without clogging. Thereby, fly ash collides, and crushing of fly ash is accelerated | stimulated. Moreover, since the time which stays in the horizontal pulverization area | region 22 of fly ash increases, it becomes easy to shake a heavy fly ash from the fly ash after being crushed. Further, the light fly ash flows from the horizontal crushing region 22 to the region before derivation of the target fly ash through the horizontal communication port 25 along the peripheral wall 8 a of the arcuate casing 8. Therefore, the flow of light fly ash is smooth.

  The horizontal cross-sectional area of the casing 8, which is a cross-sectional area perpendicular to the axis of the classifier 2, is at least twice the cross-sectional area in the radial direction of the introduction pipe 3 and 2 of the cross-sectional area in the radial direction of the lead-out pipe 4. It is more than doubled. That is, the horizontal cross-sectional area of the housing 8 is at least twice the area of the introduction side connection hole 6 and the lead-out side connection hole 7. Therefore, in the lower part of the settling and stirring region 24, the gas flow rate is considerably smaller than the gas introduction flow rate including fly ash flowing through the introduction pipe 3 and introduced from the introduction side connection hole 6. As a result, heavier fly ash and foreign matter are more likely to stay in the settling and stirring region 24, and it becomes easier to select heavy fly ash and foreign matter to be finally captured.

  The front surface of the collision plate 17 provided in the crushing plate 10 can be fixed by changing the angle around the central axis of the classifier 2. Thereby, it becomes possible to set the introduced fly ash in a flow direction inclined arrangement in which the fly ash bounces at an angle in the radial direction of the axis of the classifier 2. Therefore, centrifugal force can be applied to the fly ash contained in the gas, and separation of heavy fly ash and light fly ash can be promoted.

  In this manner, the target fly ash particles of 2 to 3 μm can be efficiently obtained in a short time by the small and compact classifier 1. In this embodiment, a fly ash treatment of 3.5 t / h can be realized by weight. Accordingly, since one type of fly ash can be obtained easily and quickly, the efficiency of the classification process can be increased.

  Also, if four types of fly ash particles (including two types) are discharged from the dampers 28 and 29 by about 5% of the processing amount, one type of fly ash particles is derived from the outlet tube 4. Therefore, many types of fly ash particles corresponding to one type can be obtained efficiently.

  The fly ash particles corresponding to one kind thus obtained are suitable as a concrete admixture, and the fluidity of the concrete paste mixed with the fly ash particles can be improved.

In the correspondence between the present invention and the embodiment,
The introduction part corresponds to the introduction pipe 3,
The derivation unit corresponds to the derivation pipe 4,
The crushed body corresponds to the crushed plate 10,
The discharge side space corresponds to the sedimentation stirring region 24,
The flow side space corresponds to the horizontal crushing region 22 and the target fly ash derivation region 23 (including the horizontal communication port 25),
The angle change fixing means corresponds to the lid 9, the bolt insertion hole 12 a of the lid 9, the flange portion 11, the bolt insertion hole 12 of the flange portion 11, the bolt 13, and the nut 14, but the present invention is not limited to this embodiment. However, various other embodiments are possible.

  For example, the classifier 1 is installed at a subsequent stage of a heating reformer that removes unburned carbon by heating fly ash to 600 ° C. to 800 ° C., which is higher than the self-combustion temperature, and further pulverizes the fly ash after reforming. Can be configured to be classified. Thereby, the classification | category after heat-reforming is realizable with the small and compact classifier 1. FIG.

  Moreover, the classification apparatus 1 can also be provided in the front | former stage of the heat-reforming apparatus mentioned above. In this case, since the classified fly ash can be charged into the heat reforming apparatus, for example, the heat reforming can be performed in a state in which impurities and the like are removed to increase the thermal efficiency.

  Further, the upper side 16 a (here, synonymous with the upper side 10 a of the crushing plate 10) of the crushing plate main body 16 may be separated from the lid body 9. In this case, since the light flowing over the upper side 16a of the crushing plate body 16 and flowing from the horizontal crushing region 22 to the region 23 before derivation of the target fly ash includes only lighter fly ash, classification of light fly ash is performed. Can be performed efficiently.

  The present invention can be used in industries that require classification of fly ash.

DESCRIPTION OF SYMBOLS 1 ... Classifier 2 ... Classifier 3 ... Introducing pipe 4 ... Outlet pipe 5 ... Discharge part 6 ... Inlet side connecting hole 7 ... Outlet side connecting hole 8 ... Housing 8a ... Case peripheral wall 9 ... Lid 10 ... Disintegrating Plate 10b ... Side of crushing plate 10c ... Lower side 11 of crushing plate ... Flange 16 ... Crushing plate body 17 ... Colliding plate 18 ... Support plate 19 ... Discharge side connecting hole 22 ... Horizontal crushing region 23 ... Target fly Pre-ash derivation region 24 ... sedimentation stirring region 25 ... horizontal communication port 26 ... introduction side vertical communication port 27 ... discharge side vertical communication port 28 ... upper end damper 29 ... lower damper 30 ... discharge mechanism

Claims (6)

An introduction part for vigorously introducing fly ash conveyed by the flowing gas;
A classifier for classifying the fly ash that is connected to the introduction part and vigorously introduced from the introduction part into desired spherical particles that are spherical particles having a desired size or less and other discharged substances;
A deriving unit for deriving the desired spherical particles classified by the classifier from the classifier;
A discharge unit that discharges the heavy discharged product classified by the classifier from the classifier;
The introduction side connection hole provided in the connection part of the classifier and the introduction part, and the lead-out side connection hole provided in the connection part of the classifier and the lead-out part are connected parts of the classifier and the discharge part. Provided above the discharge side connecting hole provided in the
The classifier is
A crushed body that is provided at a position where the fly ash vigorously introduced from the introduction side connecting hole collides and rebounds the fly ash;
A discharge side space that is provided at a lower position of the crushed body and collects the discharged matter;
Flow that causes the desired spherical particles contained in the fly ash introduced vigorously to flow together with the flowing gas to the outlet portion at a position other than the discharge side space around the crushed body without being rebounded by the crushed body Fly ash classifier with side space. 2. The fly according to claim 1, wherein the crushing body is formed such that a size of an introduction side facing surface facing the introduction side coupling hole is larger than at least one of the introduction side coupling hole and the outlet side coupling hole. Ash classifier. The entrance area of the discharge side space, fly ash classifier of <br/> claim 1 or 2, wherein is formed wider than the area of the inlet-side connecting hole. The fly ash classifier according to claim 1, 2, or 3, further comprising an angle change fixing means capable of changing and fixing the facing angle of the crushed object facing the introduction side connecting hole. An introduction part for vigorously introducing fly ash conveyed by the flowing gas;
A classifier for classifying the fly ash that is connected to the introduction part and vigorously introduced from the introduction part into desired spherical particles that are spherical particles having a desired size or less and other discharged substances;
A deriving unit for deriving the desired spherical particles classified by the classifier from the classifier;
Using a fly ash classifier equipped with a discharge unit that discharges the heavy discharged product classified by the classifier from the classifier,
The fly ash is vigorously introduced from the introduction side connection hole which is a connection part of the introduction part and the classifier provided above the discharge side connection hole where the discharge part is connected to the classifier,
The fly ash that has been vigorously introduced from the introduction side connecting hole is rebounded by a crushed body provided at a position where the fly ash collides,
Splash fly ash and the crushing due to collision of the fly ash to be followed introduced,
Collect the discharge in a discharge side space provided in a lower position of the crushed body,
Deriving the desired spherical particles obtained by crushing due to the collision to the outlet part by the flowing gas in the discharge side space,
At least a part of the desired spherical particles contained in the fly ash vigorously introduced from the introduction side connection hole is passed through the flow side space provided at a position other than the discharge side space around the crushed body. The fly ash classification method derived | led-out from the said derivation | leading-out part, without rebounding by a crushing body. An introduction part for vigorously introducing fly ash conveyed by the flowing gas;
A classifier for classifying the fly ash that is connected to the introduction part and vigorously introduced from the introduction part into desired spherical particles that are spherical particles having a desired size or less and other discharged substances;
A deriving unit for deriving the desired spherical particles classified by the classifier from the classifier;
Using a fly ash classifier equipped with a discharge unit that discharges the heavy discharged product classified by the classifier from the classifier,
The fly ash is vigorously introduced from the introduction side connection hole which is a connection part of the introduction part and the classifier provided above the discharge side connection hole where the discharge part is connected to the classifier,
The fly ash that has been vigorously introduced from the introduction side connection hole is rebounded by a crushed body provided at a position where the fly ash collides,
Splash fly ash and the crushing due to collision of the fly ash to be followed introduced,
Collect the discharge in a discharge side space provided in a lower position of the crushed body,
Deriving the desired spherical particles obtained by crushing due to the collision to the outlet part by the flowing gas in the discharge side space,
At least a part of the desired spherical particles contained in the fly ash vigorously introduced from the introduction side connection hole is passed through the flow side space provided at a position other than the discharge side space around the crushed body. Derived from the derivation unit without rebounding by the crushed object,
A spherical fly ash particle group production method for producing a spherical fly ash particle group obtained by classifying the desired spherical particles from the fly ash.