Powder storage device, powder storage method, and powder dispersing device

Abstract

To provide a powder / grain storage device or the like capable of storing powder / grain in an appropriate distribution mode.SOLUTION: A powder and granular material storage device includes a storage part for storing powder and granular material, a supply port for supplying the powder and granular material to the storage part, and a discharge port for discharging the powder and granular material from the storage part. The accommodating portion includes a dispersing portion that disperses a movement direction of the powder or granular material at a position intersecting an opening axis of the supply port. The dispersion portion includes a plurality of leg portions formed to extend from the opening axis side toward the wall portion side of the accommodation portion. Each of the plurality of leg portions is narrowed toward the supply port in a direction along the opening axis.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a powder and granular material storage device, a powder and granular material storage method, and a powder and granular material dispersion device for storing powder and granular material. [Background technology]

[0002] One example of a granular material is the raw material for coke. High-quality caking coal is the raw material for coke. The price of caking coal has been rising in recent years due to excessive demand. To address this issue, new coke manufacturing technologies, such as the "molded coal blending method," which uses low-grade coal, have been developed.

[0003] In the briquetting method, at least a portion of the coal charged into a coke oven is replaced with briquette coal. Briquette coal is produced by mixing crushed coal with a binder and molding the mixture under pressure.

[0004] The briquettes are transported to the coke oven via a conveying line including hoppers, chutes, and belt conveyors. When the briquettes are charged into the coke oven, not only the briquettes alone but also a mixture of the briquettes and powdered coal is sometimes charged.

[0005] Briquette coal is formed by molding coal particles in close proximity to each other. When such briquette coal is heated to soften or melt, fusion is promoted. This allows for a higher blend ratio of low-grade non-caking coal. The higher the blend ratio of briquette coal to total coal, the more non-caking coal can be used as coke raw material.

[0006] Furthermore, by blending molded coal with the raw material for coke, the average bulk density of the coal increases, allowing the amount of coal to be charged to be increased, thereby improving coke productivity.

[0007] Briquette coal has a different moisture content from powdered coal. When a mixture of briquette coal and powdered coal is charged into a coke oven, the briquette coal segregates in the coke oven. That is, the segregation of the briquette coal in the coke oven causes an imbalance in the moisture content of the contents in the coke oven.

[0008] The rate at which carbon deposits on the walls of a coke oven is affected by the moisture content of the contents. Therefore, uneven moisture content in the contents of the coke oven causes uneven carbon deposition on the walls of the coke oven. This can result in problems such as clogging of the coke oven.

[0009] To avoid such problems, measures to prevent the segregation of briquettes are being studied. One of the causes of briquettes segregation in coke ovens is thought to be particle size segregation of the raw materials in the coal tower located upstream of the coke oven.

[0010] One of the factors that causes particle size segregation of raw materials in a coal tower is the Brazil nut effect on the upper conveyor. The Brazil nut effect is a phenomenon in which, when vibration is applied to powder with a particle size distribution, relatively large coarse particles rise to the surface and relatively small fine particles sink to the bottom.

[0011] The Brazil nut effect can also occur on the raw material conveyor that transports the raw material to the coal tower. As a result, the raw material is fed to the coal tower with the coarse briquettes segregating on the surface and the fine pulverized coal segregating in the lower layer.

[0012] As an example of a countermeasure against the Brazil nut effect, Patent Document 1 discloses a method of installing a segregation adjustment plate on the falling trajectory of the raw material and reversing the positional relationship between the coarse particles and the fine particles by inverting the raw material and causing it to fall. [Prior art documents] [Patent documents]

[0013] [Patent Document 1] Special Publication No. 57-61809 Summary of the Invention [Problem to be solved by the invention]

[0014] The inventors have discovered that one of the causes of segregation in the coal tower is the pile of raw material formed by the raw material falling from the raw material conveyor. Specifically, the inventors have discovered that when raw material is supplied to the coal tower, coarse particles roll and move along the ridge of the pile of raw material, causing size segregation of the coarse particles at the foot of the pile of raw material.

[0015] However, the method of Patent Document 1 cannot improve the particle size segregation of coarse particles caused by the shape of the raw material pile, and further improvement in particle size segregation of raw materials has been desired.

[0016] The present invention has been made in view of the above problems, and has an object to provide a powder and granular material storage device and the like that can store powder and granular material in an appropriate distribution pattern. [Means for solving the problem]

[0017] In order to solve the above problems, the present invention has the following features. [1] A powder / granular material storage device having a storage section that stores powder / granular material, a supply port that supplies the powder / granular material to the storage section, and a discharge port that discharges the powder / granular material from the storage section, the storage section has a dispersion section that disperses the moving direction of the powder or granular material at a position that intersects with an opening axis of the supply port, the dispersion portion has a plurality of legs formed to extend from the opening axis side toward the wall portion side of the storage portion, A powder or granular material storage device, wherein each of the plurality of leg portions is formed to taper toward the supply port in a direction along the opening axis. [2] the plurality of leg portions include a first leg portion formed on the opening axis side of the supply port and a second leg portion formed on the wall side of the storage portion, The powder / granular material storage device according to [1], wherein the first leg portion is formed at an obtuse angle with respect to the second leg portion. [3] The angle that the second leg portion forms with respect to the direction along the opening axis is 20 to 35 degrees, The powder / granular material storage device according to [2], wherein the length of the dispersion section along the opening axis is 100 mm or more. [4] The leg portions of the dispersion portion are formed at an even number of locations at equal intervals in the circumferential direction, When the length of the first leg portion is twice the length of the first leg portion and the inner diameter of the housing portion is D, the relationship 0.15≦d / D≦0.25 is satisfied, and The powder / granular material storage device according to [2] or [3], wherein, when the width of the first leg portion is w, 0.5≦w / d≦1.0 is satisfied. [5] A method for storing powder or granular material using the powder or granular material storage device according to any one of [1] to [4], a supply step of supplying the powder or granular material from the supply port toward the dispersion section; a dispersion step of dispersing the moving direction of the powder or granular material in the dispersion unit; A method for containing powder or granular material, comprising: [6] A method for storing powder or granular material using the powder or granular material storage device according to any one of [2] to [4], a depositing step of depositing the powder or granular material in the first leg portion of the dispersion unit; a supply step of supplying the powder or granular material from the supply port toward the powder or granular material piled up on the first leg portion; a dispersion step of dispersing the moving direction of the powder or granular material in the dispersion unit through the powder or granular material deposited on the first leg portion; A method for containing powder or granular material, comprising: [7] A powder / granular material dispersion device used in the powder / granular material storage device according to any one of [1] to [4], a plurality of legs extending from the inner side to the outer side in the circumferential direction; A powder / granular material dispersion device, wherein each of the plurality of leg portions is formed so that the outer side in the circumferential direction is lower than the inner side in the circumferential direction. [8] Each of the plurality of leg portions has a first leg portion formed on the inner side in the circumferential direction and a second leg portion formed on the outer side in the circumferential direction, The powder / granular material dispersion device according to [7], wherein the first leg portion is formed at an obtuse angle with respect to the second leg portion. [Effects of the Invention]

[0018] According to the powder / granular material storage device of the present invention, the storage section for storing powder / granular material has a dispersion section that disperses the movement direction of the powder / granular material at a position where it intersects with the opening axis of the supply port. The dispersion section also has multiple legs extending from the opening axis of the supply port toward the wall of the storage section. Each of the multiple legs is tapered toward the supply port in a direction along the opening axis. Therefore, the powder / granular material moves according to the shape of the legs of the dispersion section. That is, the movement direction of the powder / granular material is dispersed by the dispersion section. This makes it possible to adjust the formation pattern of piles of raw material in the powder / granular material storage device. As a result, particle size segregation of the powder / granular material in the powder / granular material storage device can be suppressed. [Brief explanation of the drawings]

[0019] [Figure 1] FIG. 2 is an explanatory diagram showing the configuration of a powder / granular material storage device. [Figure 2] FIG. 2 is a top view of the powder / granular material storage device. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. [Figure 6] 1 is an explanatory diagram showing a state in which a dispersion part is attached to a storage part 10. FIG. [Figure 7] 1 is a flow chart of a storage method using a powder / granular material storage device. [Figure 8]FIG. 8 is an explanatory diagram showing a manner in which the dispersing step in step S03 of FIG. 7 is performed. [Figure 9] FIG. 10 is a perspective view of a dispersion portion according to a modified example. [Figure 10] 10 is a graph showing the maximum proportion of briquettes when the inclination angle of the dispersion section and the height of the dispersion section are changed. [Figure 11] 10 is a graph showing the maximum proportion of briquettes when the length of the upper surface of the dispersion section is changed. [Figure 12] 10 is a graph showing the maximum proportion of briquettes when the width of the dispersion portion is changed. [Figure 13] 10 is a graph showing the maximum proportion of briquettes when the number of legs of the dispersion section is changed. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows the configuration of a powder / granular material storage device 100. As the powder / granular material, for example, a mixture of two or more types of material with different average particle sizes, such as molded charcoal and pulverized charcoal, can be used. In other words, any material that can produce the Brazil nut effect can be used as the powder / granular material.

[0021] The powder and granular material is not limited to a mixture of molded coal and powdered coal, and may be, for example, two or more types of powder having different average particle sizes selected from sintered ore, molded coal, HBI (Hot Briquetted Iron), limestone, mudstone, silica stone, etc. In this embodiment, an example will be described in which the powder and granular material storage device 100 is used as a storage device for a mixture of molded coal and powdered coal.

[0022] The powder / granular material storage device 100 is not particularly limited as long as it can store powder / granular material, but may be, for example, a hopper used as a coal tower. The powder / granular material storage device 100 has a storage section 10 that stores powder / granular material PD.

[0023] The storage section 10 is formed in a box shape, and in the example shown in Fig. 1, a plurality of storage sections 10 are provided adjacent to each other. The top of the storage section 10 is formed to be open. A lid section 20 that closes the opening is provided above the storage section 10.

[0024] The lid part 20 is provided with a supply port 21 for supplying powder or granular material PD to the storage part 10. The storage part 10 is provided with a dispersion part 30 at a position facing the supply port 21 for dispersing the moving direction of the powder or granular material PD.

[0025] Discharge ports 11 for discharging the powder or granular material PD to the outside are provided below the storage section 10. The number of discharge ports 11 is not particularly limited, but for example, a total of 16 discharge ports 11 are provided in four rows of four.

[0026] The powder PD supplied from the supply port 21 comes into contact with the dispersion section 30 and then accumulates in the storage section 10. The powder PD accumulated in the storage section 10 is discharged from the discharge port 11 to the outside.

[0027] A belt conveyor (not shown) is connected to the discharge port 11. The powder PD discharged from the discharge port 11 is transported to, for example, a coke oven (not shown) by the belt conveyor.

[0028] Fig. 2 shows the top surface of the powder / granular material storage device 100. As shown in Fig. 2, in this embodiment, the storage section 10 is formed in a rectangular shape when viewed from above. The storage sections 10 are provided in four locations so as to form a ring when viewed from above.

[0029] The lid portion 20 is provided so as to close the opening of each of the storage portions 10. The supply port 21 of the lid portion 20 is provided at a position corresponding to the center of each of the storage portions 10.

[0030] A conveyor 40 is provided in the center of the lid portion 20 to transport the powder or granular material PD to the supply ports 21. A chute 50 is provided at the tip of the conveyor 40. The conveyor 40 is provided on the lid portion 20 so as to be rotatable on a revolving track 41. Each of the four supply ports 21 is provided on the revolving track 41. In the example shown in FIG. 2, the supply ports 21 are provided at 90° intervals on the revolving track 41.

[0031] Fig. 3 is a perspective view of the dispersion section 30. As shown in Fig. 3, the dispersion section 30 is formed so as to narrow in its height direction. The dispersion section 30 is formed with a plurality of leg portions 31 extending from the inner side to the outer side in the circumferential direction. Each of the plurality of leg portions 31 is formed so that the outer side in the circumferential direction is lower than the inner side in the circumferential direction. The dispersion section 30 functions as a dispersion device for powder and granular material.

[0032] Although there are no particular limitations on the manner in which the legs 31 are provided, it is preferable that they are provided at an even number of locations. It is more preferable that the legs 31 are provided at four or more locations. In this embodiment, four legs 31 are provided at equal intervals in the circumferential direction.

[0033] By providing the legs 31 in four or more locations, the dispersion effect of the powder PD by the dispersion unit 30 can be appropriately obtained. Note that as the number of legs 31 increases, the size of the gaps between the legs 31 decreases. For this reason, there is a risk that the powder PD will adhere to and clog the gaps. Furthermore, as the number of legs 31 increases, the weight of the dispersion unit 30 also increases. From this perspective, it is most preferable that the legs 31 are provided in four locations and form a cross shape when viewed from above.

[0034] Each of the plurality of leg portions 31 has a first leg portion 32 formed on the inner side in the circumferential direction and a second leg portion 33 formed on the outer side in the circumferential direction. The first leg portion 32 is formed at an obtuse angle with the second leg portion 33.

[0035] In this embodiment, the first leg 32 is formed to form the upper base of a frustum. The first leg 32 is formed to form an obtuse angle with the second leg 33. That is, the second leg 33 has an inclined surface formed to become lower from the end of the first leg 32 toward the outside in the circumferential direction. It is preferable that the inclined surface of the second leg 33 is formed continuously. By forming the inclined surface in this manner, the powder or granular material PD can be moved smoothly.

[0036] The length of the second leg 33 in the outward circumferential direction may be set, for example, according to the distance from the tip of the second leg 33 to the wall of the storage section 10. By setting it in this way, it is possible to prevent the powder PD from colliding with the wall of the storage section 10 and pulverizing the raw material. Note that, since almost no part of the dispersion section 30 comes into contact with the powder PD except for the upper surface and the inclined surface of the second leg 33, it may be formed hollow to reduce weight.

[0037] Fig. 4 shows the top surface of the dispersion section 30. As shown in Fig. 4, the dispersion section 30 is preferably formed in a shape that is symmetrical about its center when viewed from above. In the example shown in Fig. 4, the dispersion section 30 is formed in a cross shape when viewed from above.

[0038] The length twice the length of the first leg 32 in the outward circumferential direction (hereinafter also referred to as the length of the upper surface) is defined as "d." The width of the leg 31 is defined as "w." The length d and width w of the upper surface are preferably formed to satisfy the relationship of the following formula (1). 0.5≦w / d≦1.0 (1)

[0039] By satisfying the relationship of formula (1), the positions at which the peaks of the powder PD are formed in the storage section 10 can be made more complex. As a result, particle size segregation can be more effectively suppressed. In particular, by making w / d 0.5≦w / d, the positions at which the peaks are formed in the storage section 10 can be appropriately adjusted.

[0040] FIG. 5 shows a side view of the dispersion section 30. As shown in FIG. 5, the height of the dispersion section 30 is designated "h." The height h of the dispersion section 30 may be set according to the distance from the top surface of the dispersion section 30 to the supply port 21. The height h of the dispersion section 30, i.e., the length of the dispersion section 30 along the opening axis AX of the supply port 21, may be set to 100 mm or more. By setting the height h of the dispersion section 30 to 100 mm or more, the powder / granular material PD can be moved via a variety of routes other than free fall. This makes it possible to more appropriately suppress particle size segregation of the powder / granular material PD.

[0041] Furthermore, the angle θ that the second leg 33 makes with respect to the direction D1 along the opening axis AX of the supply port 21 (hereinafter also referred to as the tilt angle) is preferably 20 to 35°. By setting the tilt angle θ to 20 to 35°, two movement routes are formed: one in which the powder or granular material PD moves in a trajectory that is close to free fall from between the legs 31, and another in which the powder or granular material PD moves along the slope of the legs 31. Since the flying distance of the powder or granular material PD differs on both routes, the falling points can be dispersed efficiently.

[0042] By setting the inclination angle θ to 20° or more, the flying distance of the powder PD can be made appropriate. Furthermore, by setting the inclination angle θ to 35° or less, the proportion of the powder PD that moves along the inclined surface of the leg portion 31 can be made appropriate. Therefore, the powder PD can be stored in the storage portion 10 in a state similar to that of small mountains.

[0043] 6 shows an embodiment in which the dispersion section 30 is provided in the storage section 10. As shown in FIG. 6, the dispersion section 30 is provided on the falling trajectory of the powder or granular material PD supplied from the supply port 21. More specifically, the dispersion section 30 is provided at a position where it intersects with the opening axis AX of the supply port 21. In this embodiment, the dispersion section 30 is provided at a position where the center position of the upper surface coincides with the opening axis AX of the supply port 21.

[0044] The dispersion section 30 has a plurality of legs 31 formed to extend from the opening axis AX side of the supply port 21 toward the wall 12 side of the storage section 10. Each of the plurality of legs 31 is formed so that the wall 12 side of the storage section 10 is lower than the opening axis AX side of the supply port 21. In other words, each of the plurality of legs 31 is formed to taper toward the supply port 21 in the direction along the opening axis AX.

[0045] In the example shown in FIG. 6, the dispersion section 30 is supported on the lid section 20 by a plurality of rod-shaped supports 35. The supports 35 are preferably connected to the outer circumferential ends of the dispersion section 30. By attaching the supports 35 in this manner, it is possible to reduce the frequency of contact between the powder PD and the supports 35. As a result, it is possible to prevent the powder PD from clogging the supports 35. The manner in which the dispersion section 30 is provided in the storage section 10 is not limited to this, and the dispersion section 30 may be supported on the wall section 12, for example.

[0046] The inner diameter of the housing portion 10 is defined as "D." The inner diameter D and the length d of the upper surface should preferably satisfy the following formula (2). 0.15≦d / D≦0.25 (2)

[0047] By making d / D 0.15≦d / D, the range in which the powder or granular material falls can be made appropriate for the inner diameter of the storage section 10. Therefore, the powder or granular material can fall not only on the wall section 12 of the storage section 10 but also on various other positions. Furthermore, by making d / D ≦0.25, the risk of the powder or granular material PD colliding with the wall section 12 of the storage section 10 and being pulverized can be reduced.

[0048] Incidentally, the storage section 10 may be formed in a tapered shape that narrows downward. In such a case, the inner diameter D of the storage section 10 is preferably measured at a height position where the upper surface of the dispersion section 30 is formed. Furthermore, when the storage section 10 is formed in a rectangular parallelepiped shape, the inner diameter D of the storage section 10 may be the distance between the wall sections 12 in the short side direction.

[0049] By measuring the inner diameter of the storage section 10 at such a position, it is possible to set d / D taking into account the risk of the powder PD moving through the dispersion section 30 colliding with the wall section 12, regardless of the shape of the storage section 10.

[0050] The dispersion section 30 is preferably provided at a position at a distance from the supply port 21 that is equal to or greater than the length d of the upper surface of the dispersion section 30 and equal to or less than twice the length d of the upper surface. By providing the dispersion section 30 at such a position, it is possible to prevent the powder PD from clogging between the dispersion section 30 and the lid section 20. In addition, the length of the support section 35 can be made appropriate, and the weight supported by the support section 35 can be made light.

[0051] A method for storing powder or granular material using the powder or granular material storage device described above will now be described. Fig. 7 shows a flow of the method for storing powder or granular material using the powder or granular material storage device. As shown in Fig. 7, powder or granular material PD is supplied from supply port 21 toward dispersion section 30, and a deposition step is performed in which powder or granular material PD is deposited in first leg section 32 of dispersion section 30 (step S01).

[0052] Next, a supply step is performed in which the powder PD is supplied from the supply port 21 toward the powder PD piled up on the first leg portion 32 (step S02).

[0053] Next, a dispersion step is performed in which the direction of movement of the powder PD is dispersed in the dispersion section 30 via the powder PD piled up on the first leg section 32 (step S03).

[0054] Fig. 8 shows how the dispersion step of step S03 in Fig. 7 is performed. As shown in Fig. 8, the powder PD charged through the supply port 21 is deposited on the first leg 32 of the dispersion unit 30, i.e., on the upper surface of the dispersion unit 30, by free fall.

[0055] Thereafter, the powder PD charged from the supply port 21 comes into contact with the powder PD piled on the upper surface of the dispersion section 30. At this time, the powder PD charged from the supply port 21 comes into contact with the powder PD piled on the upper surface of the dispersion section 30, and the moving speed of the powder PD is reduced.

[0056] As shown by the dotted arrows in Figure 8, the powder PD that comes into contact with the powder PD deposited on the upper surface of the dispersion section 30 moves along either (1) a route that moves along the inclined surface of the leg section 31, or (2) a route that moves between adjacent leg sections 31.

[0057] That is, the powder or granular material PD supplied to the dispersion section 30 moves in accordance with the configuration of the legs 31 of the dispersion section 30. In other words, the dispersion section 30 disperses the powder or granular material PD in the moving direction.

[0058] Therefore, the powder or granular material PD is supplied to the storage unit 10 from various directions. The powder or granular material PD supplied to the storage unit 10 is piled up in a convex shape. The shape of the powder or granular material PD piled up in the storage unit 10 is formed according to the dispersion mode of the powder or granular material PD in the dispersion unit 30. That is, the dispersion unit 30 can disperse the powder or granular material PD to multiple points. As a result, a pile of raw material having a complex shape, like numerous small hills of powder or granular material PD standing randomly, is formed in the storage unit 10. Therefore, the storage device 100 for powder or granular material of the present invention makes it possible to adjust the formation mode of the pile of raw material. As a result, coarse particles can be dispersed and stored in the storage unit 10, and particle size segregation of the powder or granular material PD in the storage device 100 for powder or granular material can be suppressed.

[0059] (Variation) In the above-described embodiment, the dispersion section 30 is formed so that the powder PD charged from the supply port 21 is piled up on the first leg section 32. The dispersion section 30 is not limited to such a shape as long as it is formed so as to be able to disperse the powder PD charged from the supply port 21 in the moving direction. In other words, the first leg section may be formed in a hemispherical shape.

[0060] Fig. 9 is a perspective view of a dispersion portion 60 according to a modified example. As shown in Fig. 9, the dispersion portion 60 is formed so as to narrow in the height direction. The dispersion portion 60 is formed with a plurality of leg portions 61 extending from the inner side to the outer side in the circumferential direction. Each of the plurality of leg portions 61 is formed so that the outer side in the circumferential direction is lower than the inner side in the circumferential direction.

[0061] Each of the plurality of leg portions 61 has a first leg portion 62 formed on the inner side in the circumferential direction and a second leg portion 63 formed on the outer side in the circumferential direction.

[0062] In this embodiment, the first leg portion 62 is formed to have a semispherical shape. The second leg portion 63 is formed in the same manner as the second leg portion 33 in the above embodiment, and therefore a description thereof will be omitted.

[0063] Forming the dispersion section 60 in this manner also makes it possible to adjust the formation state of piles of raw material in the powder / granular material storage device 100. As a result, particle size segregation of the powder / granular material PD in the powder / granular material storage device 100 can be suppressed. [Example]

[0064] Using a small test device of 1 / 4 size that imitates the powder storage device described in the above embodiment, the distribution pattern when raw materials were charged into the powder storage device was investigated.

[0065] Sixteen collection boxes were set up to resemble coal towers. Raw materials were charged into the coal towers using conveyors and chutes of the same shape as those installed in the actual machine. The raw material composition was 20% by mass of briquettes and 80% by mass of powdered coal. After 150 kg of raw materials were charged into the collection boxes, the weight percentage of briquettes in each collection box was investigated.

[0066] The maximum briquette ratio (mass%) obtained by comparing the briquette ratios of the 16 collection box samples was used as an index of briquette size segregation.

[0067] (Test Example 1) The effects of the inclination angle θ of the second leg and the height h of the dispersion section were investigated. The relationship between the inner diameter of the dispersion section and the storage section was set to d / D = 0.2 and w / d = 0.6. The maximum briquette proportion [mass %] was investigated when the inclination angle θ and the height h of the dispersion section were changed. The results are shown in Figure 10.

[0068] As shown in Fig. 10, the maximum briquette ratio was lower than that of the comparative example regardless of the inclination angle θ and the height h of the dispersion section. That is, the inventive example with the dispersion section showed a reduction in briquette size segregation. In particular, the maximum briquette ratio was lower when the inclination angle θ was 20 to 35° and the height h of the dispersion section was ≥ 100 mm.

[0069] (Test Example 2) The effect of the length d of the top surface of the dispersion section on the maximum briquette coal ratio was investigated. The inner diameter of the hopper was 5000 mm. The inclination angle θ was set to 25°, and the height h of the dispersion section was set to 200 mm. The relationship between the inner diameters of the dispersion section and the storage section was set to w / d = 0.6. The maximum briquette coal ratio [mass %] was investigated when the length d of the top surface of the dispersion section was changed. The results are shown in Figure 11.

[0070] As shown in Fig. 11, the maximum briquette ratio was lower than that of the comparative example regardless of the length d of the upper surface of the dispersion section. That is, the invention example with the dispersion section showed a reduction in briquette size segregation. In particular, the maximum briquette ratio was lower when 0.15 ≤ d / D ≤ 0.25.

[0071] (Test Example 3) The effect of the width w of the dispersion section on the maximum briquette ratio was investigated. The inclination angle θ was set to 25°, and the height h of the dispersion section was set to 200 mm. The relationship between the inner diameter of the dispersion section and the storage section was set to d / D = 0.2. The maximum briquette ratio [mass %] was investigated when the width w of the dispersion section was changed. The results are shown in Figure 12.

[0072] As shown in Fig. 12, the maximum briquette ratio was better than that of the comparative example regardless of the width w of the dispersion part. That is, the invention example with the dispersion part provided showed mitigation of briquette size segregation. In particular, a better maximum briquette ratio was obtained when 0.5 ≤ w / d ≤ 1.0.

[0073] (Test Example 4) The effect of the number of legs in the dispersion section on the maximum briquette ratio was investigated. The inclination angle θ was set to 25°, and the height h of the dispersion section was set to 200 mm. The relationship between the inner diameters of the dispersion section and the storage section was set to d / D = 0.2 and w / d = 0.6. The maximum briquette ratio [mass %] was investigated when the number of legs in the dispersion section was changed. The results are shown in Figure 13.

[0074] As shown in Figure 13, regardless of the number of legs of the dispersion section, a better maximum briquette ratio was obtained than in the comparative example. That is, in the inventive example with the dispersion section, briquette size segregation was alleviated. In particular, a better maximum briquette ratio was obtained when the number of legs was four or more. [Explanation of symbols]

[0075] 100 Powder and granular material storage device 10 Storage section 21 Supply port 30 Dispersion section 31 Legs 32 First Leg 33 Second Leg PD powder

Claims

1. A powder / granular material storage device having a storage section that stores powder / granular material, a supply port that supplies the powder / granular material to the storage section, and a discharge port that discharges the powder / granular material from the storage section, the storage section has a dispersion section that disperses the moving direction of the powder or granular material at a position that intersects with an opening axis of the supply port, the dispersion portion has a plurality of legs formed to extend from the opening axis side toward the wall portion side of the storage portion, A powder or granular material storage device, wherein each of the plurality of leg portions is formed to taper toward the supply port in a direction along the opening axis.

2. the plurality of leg portions include a first leg portion formed on the opening axis side of the supply port and a second leg portion formed on the wall side of the storage portion, The powder / granular material storage device according to claim 1 , wherein the first leg portion is formed at an obtuse angle with respect to the second leg portion.

3. 0 The angle that the second leg forms with respect to the direction along the opening axis is 20 to 35 degrees, The powder / granular material storage device according to claim 2, wherein the length of the dispersion portion along the opening axis is 100 mm or more.

4. The leg portions of the dispersion portion are formed at an even number of locations at equal intervals in the circumferential direction, When the length of the first leg portion is twice the length of the first leg portion and the inner diameter of the housing portion is D, 0.15≦d / D≦0.25 is satisfied, and 3. The powder / granular material storage device according to claim 2, wherein, when the width of the first leg portion is w, 0.5≦w / d≦1.0 is satisfied.

5. The leg portions of the dispersion portion are formed at an even number of locations at equal intervals in the circumferential direction, When the length of the first leg portion is twice the length of the first leg portion and the inner diameter of the housing portion is D, 0.15≦d / D≦0.25 is satisfied, and 4. The powder / granular material storage device according to claim 3, wherein, when the width of the first leg portion is w, 0.5≦w / d≦1.0 is satisfied.

6. A method for storing powder or granular material using the powder or granular material storage device according to any one of claims 1 to 5, a supply step of supplying the powder or granular material from the supply port toward the dispersion section; a dispersion step of dispersing the moving direction of the powder or granular material in the dispersion unit; A method for containing powder or granular material, comprising:

7. A method for storing powder or granular material using the powder or granular material storage device according to any one of claims 2 to 5, a depositing step of depositing the powder or granular material in the first leg portion of the dispersion unit; a supply step of supplying the powder or granular material from the supply port toward the powder or granular material piled up on the first leg portion; a dispersion step of dispersing the moving direction of the powder or granules in the dispersion unit through the powder or granules deposited on the first leg portion; A method for containing powder or granular material, comprising:

8. A powder / granular material dispersion device used in the powder / granular material storage device according to any one of claims 1 to 5, a plurality of legs extending from the inner side to the outer side in the circumferential direction; A powder / granular material dispersion device, wherein each of the plurality of leg portions is formed so that the outer side in the circumferential direction is lower than the inner side in the circumferential direction.

9. Each of the plurality of leg portions has a first leg portion formed on an inner side in the circumferential direction and a second leg portion formed on an outer side in the circumferential direction, 9. The powder / granular material dispersing device according to claim 8, wherein the first leg portion is formed at an obtuse angle with respect to the second leg portion.

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