Conveying container and conveying method of solid particles

Abstract

To provide a conveying container capable of reducing convection of solid particles with a low cost.SOLUTION: A conveying container comprises a container part having a bottom surface and a side wall surface, and a wall part arranged inside the container part. The wall part extends along the gravity direction. The wall part is arranged at a position separated from the side wall surface of the container part when the container part is seen through in the gravity direction.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a transport container and a method for transporting solid particles. [Background technology]

[0002] When solid particles such as seeds or granules are placed in a transport container and transported, the transport container is subjected to vibrations, which can cause particle convection. When particle convection occurs, friction occurs between the particles, which can lead to the particles being scraped off during transport. This type of particle convection is thought to occur in a manner in which the particles fall near the walls of the container and rise in the center of the container, causing the particles in the container to rise in a mountain shape. In response to this, Non-Patent Document 1 considers a heat storage tank that is mounted on the carriage of a transport trailer and filled with solid particles to transport solid particles of HASClay, a heat storage material, between a heat storage site and a heat dissipation site. Prevention of convection of solid particles in the heat storage tank caused by vibration during transport has been studied, and a structure has been proposed in which a pressing material is placed on the upper surface of the solid particle layer filled in the filling tank (container) and pressed down by a spring (Non-Patent Documents 1 and 2). [Prior art documents] [Non-patent literature]

[0003] [Non-Patent Document 1] Yoshi Kamata et al., "Development of an open-type adsorbent heat storage heat pump system using HASClay, Part 5: Demonstration test of an offline heat transport system," Journal of the Society of Heating, Air-Conditioning and Sanitary Engineers of Japan, No. 301, (2022), pp. 9-16 [Non-Patent Document 2] Hiroyuki Nawa et al., "Convection phenomena in a packed bed of heat storage material particles during transportation," 23rd Fluidization and Particle Processing Symposium / Society of Chemical Engineers (December 7-8, 2017) [Non-Patent Document 3] PMC Lacey, "Developments in the theory of particle mixing", J. Appl. Chem., 4, (1954), 257-268. Summary of the Invention [Problem to be solved by the invention]

[0004] The structures in Non-Patent Documents 1 and 2, that is, a structure in which a pressing member is placed on the upper surface of a particle layer and pressed down by a spring, have the problem that the structure is complicated and relatively expensive. In particular, when used in a large heat storage tank, it is necessary to provide a large pressing member and multiple distributed spring structures over the entire upper opening of the heat storage tank. The present disclosure provides a transport container capable of reducing convection of solid particles at low cost, and a method for transporting solid particles using the same. [Means for solving the problem]

[0005] The present disclosure provides a transport container, comprising: A container portion having a bottom surface and a side wall surface, and a wall portion provided inside the container portion, The wall portion extends along a gravity direction, The present invention relates to a transport container, wherein when the container portion is seen through in the direction of gravity, the wall portion is disposed at a position spaced apart from the side wall surface of the container portion.

[0006] The present disclosure also provides a method for filling the transport container with solid particles to a height where the solid particles contact a part or the whole of the wall portion, The present invention relates to a method for transporting solid particles, in which the transport container is moved in a vibrating environment with the filled solid particles in contact with the wall portion. Effect of the Invention

[0007] The present disclosure provides a transport container that can reduce convection of solid particles at low cost, and a method for transporting solid particles using the same. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of one embodiment of a transport container. [Diagram 2] FIG. 2 is a perspective view of one embodiment of a transport container seen from the direction of gravity. [Diagram 3] FIG. 2 is a perspective view of one embodiment of a wall portion. [Figure 4] FIG. 1 is a perspective view of one embodiment of a transport container. [Diagram 5] FIG. 2 is a horizontal perspective view of one embodiment of a transport container. [Figure 6] FIG. 1 is a perspective view of one embodiment of a transport container. [Figure 7] FIG. 1 is a perspective view of one embodiment of a transport container. [Figure 8] FIG. 1 is a diagram showing the simulation results of Example 1 (particle mixing state). [Figure 9] FIG. 13 is a diagram showing a simulation result of a comparative example (a state of particle mixing). [Figure 10] 13 shows the simulation results for a rectangular parallelepiped and a cylindrical container (the effect of vibration frequency on particle migration speed). [Figure 11] FIG. 13 shows the simulation results for a rectangular parallelepiped and cylindrical container (effect of amplitude on particle migration speed). [Figure 12] FIG. 1 is a diagram showing the simulation results (particle mixing degree) of Example 1 and a comparative example. [Figure 13] FIG. 1 is a diagram showing simulation results (particle mixing degree) for Examples 1, 2, and 3 and a comparative example. [Figure 14] FIG. 13 is a diagram showing the simulation results (particle mixing degree) of Examples 4 and 5 and a comparative example. [Figure 15] FIG. 13 is a diagram showing the simulation results (particle mixing degree) of Examples 3 and 6 and a comparative example. [Figure 16] FIG. 2 is a perspective view of one embodiment of a transport container seen from the direction of gravity. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] The present disclosure will be described in detail below, but the present disclosure is not limited to the following description. The materials, shapes, relative positions, etc. of the components described below are not intended to limit the technical scope of the present disclosure to those alone, unless otherwise specified. In addition, in the drawings referred to in the following description, the z-axis direction indicates the direction of gravity, the x-axis direction indicates a direction perpendicular to the z-axis direction, and the y-axis direction indicates a direction perpendicular to the z-axis direction and the x-axis direction. However, these directions merely indicate the relative positional relationship of the components of the present disclosure. In addition, the description of a numerical range such as "XX or more and YY or less" or "XX to YY" means a numerical range including the lower and upper limits, which are the endpoints, unless otherwise specified. When a numerical range is described in stages, the upper and lower limits of each numerical range can be arbitrarily combined.

[0010] (Transportation container) Fig. 1 is a perspective view of one embodiment of a transfer container 100. Fig. 2(a) is a perspective view of one embodiment of the transfer container 100 of Fig. 1 as seen from the direction of gravity (z-axis direction in Fig. 1). The transfer container 100 includes a container part 10 and a wall part 1 provided inside the container part 10. The container 10 is not particularly limited as long as it has a bottom surface and side walls, but typically has a rectangular or cubic shape, with a cavity formed inside six walls. As an example, the container 10 includes four side walls 11, 12, 13, and 14, a bottom surface 15, and a top surface 16, and is formed in a box shape. The side walls 11 to 14 extend along the Z-axis direction. The side walls 11 and 13 are perpendicular to the y-axis direction and are arranged opposite each other with a gap therebetween. The side walls 12 and 14 are perpendicular to the x-axis direction and are arranged opposite each other with a gap therebetween. The side walls 11 and 13 are arranged facing each other. One side edge in the x-axis direction of the side walls 11 and 13 is connected to each other via the side wall 12, and the other side edge in the x-axis direction of the side walls 11 and 13 is connected to each other via the side wall 14. The side walls 11 to 14 form a cylindrical body 10a extending in the direction of gravity. The cylindrical body 10a shown in FIG. 2(a) is formed in a square tube shape in which a cross section perpendicular to the direction of gravity is a square. The bottom surface 15 and the top surface 16 are arranged perpendicular to the z-axis direction and opposed to each other with a gap therebetween, with the bottom surface 15 arranged on the lower side and the top surface 16 arranged on the upper side. The bottom surface 15 closes the lower end of the cylindrical body, and the top surface 16 closes the upper end of the cylindrical body. The side walls 11, 12, 13, and 14, the bottom surface 15, and the top surface 16 define the internal space (cavity) of the container 10.

[0011] In FIG. 1, the wall 1 is illustrated as being cross-shaped when viewed in the direction of gravity. Specifically, the wall 1 is configured with a first flat plate portion 1-1 and a second flat plate portion 1-2 that extend along the direction of gravity and are perpendicular to each other. The first flat plate portion 1-1 is arranged parallel to the side wall surfaces 12 and 14, and the second flat plate portion 1-2 is arranged parallel to the side wall surfaces 11 and 13. This wall portion 1 is fixed to the bottom surface 15 of the container portion 10. In other words, the wall portion 1 extends to the bottom surface 15 of the container portion 10. In this manner, an embodiment in which a wall portion is provided on the inner bottom surface of the transport container is one of the preferred embodiments.

[0012] As shown in FIG. 2(a), when the transfer container 100 is seen through from the direction of gravity, the wall 1 is disposed at a position spaced apart from the side wall surface of the container. Preferably, the wall 1 is disposed at the center of the transfer container 100 (container section 10) (hereinafter, it may also be simply said that the wall is disposed at the center of the transfer container). By disposing the wall 1 at the center of the transfer container 100 (container section 10), particle convection described later is more easily suppressed. In this specification, disposing at the center of the transfer container may be to the extent that the effect of the present disclosure is achieved, and includes a mode in which the wall is disposed near the center of the transfer container. In other words, when the word "center" is used in this disclosure with respect to the placement of the wall, it means "center" or "near the center". For example, when the transfer container (container section) is seen through from the direction of gravity, a corner of the wall described later may be disposed at the center of the transfer container, or a part of the wall may be disposed at the center of the transfer container.

[0013] The wall 1 is provided at a distance from the side wall surfaces 11 to 14. Although not particularly limited, for example, when a heat storage material such as HASClay is held in a transport container, a duct may be connected to the transport container to ventilate the heat storage material, so that the wall 1 may be designed not to impede ventilation. In other words, the transport container may also function as a reaction container for the solid particles held therein. For example, the center of gravity of the outer shape of the transport container when viewed from the direction of gravity can be said to be the center of the transport container (container part) when viewed from the direction of gravity. For example, if the outer shape of the transport container when viewed from the direction of gravity is point symmetric, the center of the outer shape can be said to be the center of the transport container (container part) when viewed from the direction of gravity.

[0014] When the solid particles are filled in the transport container 100 and the transport container is vibrated, the particles undergo convection motion. In the center of the transport container, an upward flow occurs in which the particles rise, and a downward flow occurs in which the particles descend near the side wall of the transport container. This phenomenon is believed to be caused by the presence or absence of a wall, which restricts the direction of particle movement when the particles move with gravity or vibration as a driving force in the gaps in the particle layer caused by vibration. The more the direction in which the particles can move on the wall is limited, the more likely it is that a downward flow will occur. In the transport container of the present disclosure, the wall portion extending along the direction of gravity is located at a position separated from the side wall of the container portion. The inventors have found that by providing such a wall portion, a downward flow occurs near the wall portion and along the wall portion, which cancels out the upward flow, thereby suppressing particle convection.

[0015] (Container part) As shown in FIG. 1 and FIG. 2(a), the container part 10 constituting a part of the transfer container 100 typically has a rectangular parallelepiped or cubic shape, but the shape of the container part 10 is not limited to these. The cross-sectional shape of the cylindrical body 10a in the container part 10 is not limited to a rectangle, and may be a polygonal shape other than a rectangle. Furthermore, the cylindrical body 10a is not limited to a square tube shape, and may be formed into a cylindrical shape whose cross-sectional shape is a perfect circle or an ellipse. Furthermore, the cylindrical body 10a may be formed so that its cross-sectional shape includes straight lines and curved lines. In other words, the container part 10 may have a shape that combines flat surfaces and curved surfaces. When the container 10 (more specifically, the cylindrical body 10a) is formed in a polygonal cross section, corners (side wall corners) as shown by reference numerals 21, 22, 23, and 24 in FIG. 2(a) are generated. The side wall corners 21-24 are formed as joints of the side wall surfaces 11-14. As will be described later in the simulations of FIG. 8 and FIG. 9, the downward flow of solid particles tends to be large at the side wall corners and near the side wall surfaces in the container, and the downward flow of solid particles at the side wall corners is larger than the downward flow of solid particles near the side wall surfaces. On the other hand, when the container is formed in a cylindrical shape, the cylindrical body is composed of side wall surfaces that are continuously connected, so that no side wall corners are generated as joints of multiple side wall surfaces. In order to prevent the downward flow of solid particles at the side wall corners, it is desirable to have a container shape that does not generate side wall corners.

[0016] FIG. 2(b) is a modified example in which the side wall surfaces 11-14 of FIG. 2(a) are connected via chamfered walls 31-34. In this way, the corners formed by the side wall surfaces constituting the container part 10 are preferably chamfered. The chamfered walls 31-34 are curved surfaces, and are formed in a curved arc shape that is convex toward the outside of the container part 10 when viewed through along the gravity direction. In this shape, the side wall surface corners are rounded by the R chamfering and are substantially eliminated, which serves as a means for preventing the downward flow of particles due to the side wall surface corners. The curvature radius r of the chamfered wall is preferably 10 times or more, more preferably 50 times or more, and even more preferably 100 times or more, the diameter of the solid particle. However, if the curvature radius r of the chamfered wall is too large, the volume of the container part will decrease, so the upper limit of the curvature radius r may be set to about 10,000 times the diameter of the solid particle. A circular arc is a simple choice for the chamfered wall, but a curve of a more complicated function may also be used. The container portion 10 may have a shape in which the corners of the side wall surface are chamfered.

[0017] (wall) The shape of the wall 1 is not particularly limited as long as it extends along the direction of gravity, and examples thereof include flat, curved, L-shaped, T-shaped, Y-shaped, and cross-shaped. Specifically, the wall 1 in Figs. 1, 4, and 6 is cross-shaped, the wall 1 in Figs. 7(a) and 7(b) is flat, the wall 1 in Fig. 7(c) is L-shaped, and the wall 1 in Fig. 3 is Y-shaped. Among these, when the transport container is seen through from the direction of gravity, it is preferable that the wall is L-shaped, T-shaped, Y-shaped, or cross-shaped. With these shapes, the wall can form one or more corners as described later. It is more preferable that the wall is L-shaped or cross-shaped.

[0018] As shown in Fig. 2, when the transport container 100 is seen through in the direction of gravity, it is preferable that the wall 1 forms one or more corners. A corner refers to, for example, an angle (i.e., a minor angle) formed by two tangent planes of the wall, the angle being less than 180°. For example, in Fig. 2, it refers to a corner formed by a first flat plate portion 1-1 and a second flat plate portion 1-2 that form a cross plate shape. In other words, it can be said that it is preferable that the transport container has at least a pair of plate portions that intersect to form a corner when the transport container is seen through in the direction of gravity. As mentioned above, a downward flow occurs along the wall near the wall. If the wall forms one or more corners, the direction in which the particles can move is restricted, so the downward flow that occurs along the wall becomes faster. As a result, it becomes easier to suppress particle convection.

[0019] The angle of the corner is not particularly limited as long as it is more than 0° and less than 180°, but is preferably 45 to 135°, more preferably 60 to 120°, and even more preferably 85 to 95°. Alternatively, it may be 115 to 125°, 90°, or 120°.

[0020] FIG. 4 is a perspective view of one embodiment of the transport container 100. In FIG. 4, a wall 1 is provided on the inner bottom surface 15 of the container portion 10. As described above, the embodiment in which a wall is provided on the inner bottom surface of the container portion is one of the preferred embodiments. FIG. 5 is a perspective view of one embodiment of the transport container shown in FIG. 4 from the horizontal direction. In FIG. 5, the ratio value Lg / La of the length Lg of the wall 1 in the direction of gravity to the length La of the container portion in the direction of gravity is 0.50. The embodiment of FIG. 5 is intended to eliminate the starting point of the rise of the particle flow that rises at the center of the bottom of the particle bed by laying a wall. The same effect can be expected when Lg / La is 1.00, but when Lg / La is 1.00, a well-ordered downward flow field is generated near the wall by providing a wall. Therefore, it is expected that by setting Lg / La to 0.50, which is smaller than 1.00, the particle flow will not be promoted in the remaining space where the wall is not laid. For example, Lg / La can be 0.40 to 0.60. From the viewpoint of the container, it is considered that Lg / La of 1.00 is the easiest to manufacture and most stable. There are no particular limitations on Lg / La, and favorable conditions may be selected depending on the particles to be transported and the shape of the device.

[0021] Fig. 6 is a perspective view of one embodiment of the transfer container 100. In Fig. 6, a wall 1 is provided on the inner top surface 16 of the container part 10. Also, in Fig. 6, the ratio Lg / La of the length Lg of the wall 1 in the direction of gravity to the length La of the transfer container in the direction of gravity is 0.50.

[0022] The shape of the outer shape (container portion) of the transport container is not particularly limited, and may be a rectangular parallelepiped, cubic, cylindrical, triangular prism, or the like. If the container can be used as a transport container, the container part may have a small opening formed on the wall, bottom, or top. The small opening allows the solid particles to be filled or discharged. The container part may not have a top and may be open at the top. The wall, bottom, and top of the container part may be integrally formed, or may be detachably connected to each other. Furthermore, the wall part may be integrally formed with the container part, or may be detachably connected to each other.

[0023] The size of the outer shape (container part) of the transport container is not particularly limited, and when the container part is rectangular or cubic, the length of the bottom surface in the horizontal direction (x-axis direction and y-axis direction in FIG. 1) may be 0.10 to 3.00 m, or 0.10 to 1.60 m. When the container part is cylindrical, the diameter of the bottom surface of the container part may be 0.1 to 3.0 m, or 0.6 to 1.6 m. The length of the container part in the direction of gravity (z-axis direction in FIG. 1) may be 0.10 to 3.00 m, or 1.00 to 1.60 m. As can be seen from large trailer containers and tanker ships, the transport container can be made larger, and transport containers with lengths in both the x-axis and y-axis of several tens of meters (e.g., 20 m or 30 m) to over 100 m can be envisioned.

[0024] The thickness of the wall plate is not particularly limited, and is preferably as thin as possible as long as strength is maintained. It may be 0.1 to 1.0 mm, or 1.0 to several mm (upper limit is, for example, 2.0 mm, 3.0 mm). The length of the wall plate is preferably about 10 to 20 times the volume average particle size (mm) of the solid particles to be transported, and more preferably 20 to 30 times the length in order to be recognized as a wall. The length of the wall in the direction perpendicular to the gravity direction and the thickness direction of the wall is not particularly limited. It is sufficient if the length is long enough to suppress the pressure drop. The dimension standardized based on the length of the container wall may be 0.1 to 0.9. For example, in FIG. 5, the length of the wall 1 in the left-right direction is the length of the wall in the direction perpendicular to the direction of gravity and the thickness direction of the wall, and is 0.6 times the length of the container wall.

[0025] Furthermore, the number of walls is not particularly limited, and may be one or more. Figures 16(a) to 16(c) show variations in the arrangement of the walls when the transport container is seen through from the direction of gravity. Figure 16(a) shows an example in which one cross-shaped wall 1 is arranged in the center of the container 10, and corresponds to Figures 1, 4, and 6. Figure 16(b) shows an example in which a total of five walls 1 are arranged with one in the center and four around it. The four peripheral walls are specifically arranged on diagonals of the container 10. Moreover, Fig. 16(c) shows an example in which six wall parts 1 are arranged in a lattice pattern, not in the center. What Figs. 16(a) to (c) have in common is that the wall parts 1 are arranged at a position spaced apart from the side wall surface of the container. Figs. 16(a) to (c) show an example in which the faces of the cross-shaped walls are parallel to the side wall surface of the container, but the walls may be rotated within a range of 0 to 90 degrees around the intersection of the cross.

[0026] In the case where the number of walls is more than one, for example, when the wall located at the center of the transfer container is the first wall, it is preferable that the wall is located at the midpoint of the line segment connecting the position where the first wall is located and the wall surface of the transfer container. By arranging the wall in this manner, it becomes easier to suppress particle convection for the same reason as described in the transfer container section. The reason why it is preferable to arrange the wall at the center of the transfer container is that the rise of solid particles becomes large at the center of the container. However, the arrangement of the wall is not limited to this, and in the case where the rise of solid particles occurs in other parts when the wall is arranged at the center of the transfer container as in FIG. 16(b), it is also effective to arrange the wall around the center. Also, it is effective to arrange the wall not at the center but dispersedly as in FIG. 16(c).

[0027] The material of the outer shape and wall of the transfer container is not particularly limited, and known materials can be used, for example, metals such as stainless steel and iron, non-metallic inorganic materials such as ceramics, and resins such as thermoplastic resins.

[0028] One aspect of the present disclosure relates to a method for transporting solid particles, comprising filling a transport container with solid particles to a height where the solid particles contact part or all of the wall, and moving the transport container in a vibrating environment with the filled solid particles in contact with the wall. The solid particles are accommodated in a transport container by filling the container with the solid particles to a height where the solid particles are in contact with a part or the whole of the wall. The transport container containing the solid particles is then moved in a vibrating environment using a transport means such as a truck, a freight train, or a tanker while the solid particles are in contact with the wall, thereby allowing the solid particles to be transported. By using the transport container, particle convection can be suppressed, and the particles can be prevented from being scraped off.

[0029] The solid particles to be transported are not particularly limited, but examples thereof include inorganic particles such as zeolite and HASClay (a complex of amorphous aluminum silicate and low crystalline viscosity), seeds, and granules. The volume average particle size of the solid particles is not particularly limited, but may be, for example, 0.5 to 7.0 mm, or 1.0 to 5.0 mm. EXAMPLES

[0030] The present invention will be explained in more detail below with reference to examples, but is not limited to these examples as long as the gist of the invention is not exceeded.

[0031] Example 1 The particle convection in the transfer container was analyzed by simulation using the thermal fluid and powder analysis software "R-FLOW" (by R-Flow Corporation). In this Example 1, the transfer container shown in FIG. 4 was used and the simulation conditions were as follows. The wall shape in Example 1 can be abbreviated to "lower half of a cross".

[0032] Horizontal cross section of container: 0.1m square Vertical height of container: 0.12m - Shape of the side wall of the container: Flat -Shape of wall to be laid: Cross-shaped Location of wall: Bottom surface inside the container Wall length (width) (X direction): 0.06m Wall length (width) (Y direction): 0.06m Wall length (height) (Z direction): 0.06m ·Filled particle particle size: 3mm ·Filled particle density: 2500 kg / m 3 ·Number of filled particles: 420,000 pieces ·Particle packed bed height: 0.08m Friction coefficient between particles, between particles and wall (side wall, wall): 0.5 Vibration frequency: 50Hz (vibration direction is Z direction) ·Vibration amplitude: 1.5mm

[0033] Figure 8 shows the simulation results for Example 1 (lower half of the cross). Particles whose centers are located within a height of Z = 0.04 m at the time of initial filling are colored black, and particles located above that are colored gray. (a) is a perspective view of the container before filling, while (b) and (c) are perspective views, with (b) showing the whole container, and (c) showing the arrangement of particles inside when divided by a cross section at X = 0.025 m. From the left in (b) and (c), the arrangement of particles is shown at 0 seconds, 5 seconds, and 10 seconds after the start of vibration, respectively.

[0034] FIG. 9 is a comparative example, and shows the case of FIG. 7(d) where there is no wall inside. The simulation conditions were the same as those of Example 1, except that the wall was removed. As in FIG. 8, particles whose centers are located at heights Z=0.04 m or less at the time of initial filling are colored black, and particles located at positions higher than that are colored gray. (a) is a perspective view of the container before filling, and (b) and (c) are perspective views, with (b) showing the whole container, and (c) showing the arrangement of particles inside the container when divided by a cross section at X=0.05 m. From the left in (b) and (c), the arrangement of particles is shown at 0 seconds, 5 seconds, and 10 seconds after the start of vibration, respectively.

[0035] The comparative example in Figure 9 shows that the particles descend at the container wall and rise in the center of the container. After 10 seconds, the particles have switched from gray to black compared to the initial state, indicating that mixing is progressing. On the other hand, in Example 1 in Figure 8, the particles descend on the container wall surface as in the case without a wall in Figure 9, but because the wall is installed, the particles also descend in the center of the container, suppressing the particles from ascending at the bottom. Compared to Figure 9, the mixing of the black and white particles progresses more slowly overall, and even after 10 seconds, there are still areas where the white or black particles are biased.

[0036] In the comparative example, a cylindrical container (not shown) was also compared in addition to the rectangular container in Fig. 7(d). The dimensions of the cylindrical container are 0.1 m in diameter and 0.12 m in height. In both containers, particle convection occurs due to vibration. Particles descend near the side wall surface, and rise in the center of the container. Therefore, the average particle movement speed was calculated by simulation. In the case of a rectangular container, if one corner of the bottom is taken as the origin (X,Y,Z)=(0,0,0), the corner is chosen as (X,Y,Z)=(0,0,0.04), the wall as (X,Y,Z)=(0.05,0,0.04), and the center as (X,Y,Z)=(0.05,0.05,0.04), and in the case of a cylindrical container, if the center of the bottom is taken as the origin (X,Y,Z)=(0,0,0), the wall as (X,Y,Z)=(0.05,0,0.04) and the center as (X,Y,Z)=(0,0,0.04), the arithmetic average of the moving speed of particles including these coordinates was calculated. The upward direction in the Z direction is considered positive.

[0037] Figure 10 shows the particle velocities calculated at the above-mentioned specified points when the amplitude is fixed at 1.5 mm and the vibration frequency is changed to 25, 50, and 100 Hz. In both the rectangular and cylindrical containers, the downward flow occurs at the wall and the upward flow occurs at the center of the container. In particular, in the rectangular container, the downward flow at the wall is faster at the corners. In the cylindrical container, no side wall corners occur. The particle movement velocity value at the wall of the cylindrical container is slower than that at the corners of the rectangular container. For these particles, particle convection is unlikely to occur at a high frequency of 100 Hz. No significant change in particle velocity was observed at 25-50 Hz.

[0038] Figure 11 shows the effect of amplitude when the vibration frequency is fixed at 50Hz. Increasing the amplitude increases the particle movement speed. In all conditions, the corner descent speed is the fastest and is greatly affected by the amplitude. The results in Figures 10 and 11 show that the particle descent speed is faster at the corners, and as mentioned above in relation to Figure 2(b), in the case of a rectangular container, it is expected that particle convection can be suppressed by chamfering the corners.

[0039] In order to quantitatively show the difference in particle convection between Example 1 in Fig. 8 and the Comparative Example in Fig. 9, the particle mixing degree M was calculated using Lacey's mixing index (see Non-Patent Document 3). Figure 12 shows the results of the particle mixing degree M for Example 1 and the Comparative Example.

[0040] The particle mixing degree M will be described below. Let us assume that there are two types of particles in the target container. The ratio of the particles of interest in the container is P. P is a value greater than 0 and less than 1. This value also represents the average particle concentration of the particles of interest throughout the container. The container is divided into several compartments, the particle concentration of the target particle in each compartment is calculated, and the variance value is calculated from the deviation from the average particle concentration P. The average value of these values ​​across all compartments is calculated, and this is taken as the average variance value V at that moment. In this case, the variance value V0 in the case of perfect mixing is P×(1-P). The variance value Vr in the case of perfect separation is expressed as P×(1-P) / n, where n is the number of particles in each compartment. If n is a sufficiently large value, Vr can be considered to be 0.

[0041] The particle mixing degree M proposed by Lacey is M = (V0-V) / (V0-Vr) This can be expressed as follows. The particle mixing degree M obtained from the simulation is a parameter that indicates the particle mixing state. The value of M is 0 when particles are segregated and 1 when particles are completely mixed. In other words, a large value of M indicates that particle mixing is promoted by particle convection.

[0042] To determine the particle mixing ratio M, the space in which the particles exist (0 to 0.1 m) is divided into 10 equal parts in each of the X, Y and Z directions, the particle presence ratio is calculated for each of the 1,000 sections, and the value of M at each time is calculated using the procedure described above. FIG. 12 shows the change over time in the particle mixing degree M in Example 1 and the comparative example. In the comparative example, the particle mixing degree was close to 0.9 after 60 seconds had passed, which indicates that the particles were almost completely mixed. In Example 1, the value of M increases at first, almost similarly to the comparative example, but the increase in M ​​is suppressed over time, and even after 60 seconds, it is still around 0.55. In other words, it is clear that mixing due to particle convection is suppressed by providing the wall portion.

[0043] Example 2 A simulation was performed in the same manner as in Example 1, except that the transport container shown in FIG. 6 was used, that is, the wall was provided on the inner top surface of the container. In Example 2, the shape of the wall was the same as in Example 1, but the difference is that the wall was provided on the top surface of the transport container. The wall shape in Example 2 can also be called "upper half of a cross" for brevity. The results are shown in FIG. 13.

[0044] Example 3 A simulation was performed in the same manner as in Example 1, except that the transport container shown in Figure 1 was used. The difference is that while in Example 1 the wall portion is the lower half of a cross (wall portion length (Z direction): 0.06 m), in Example 3 the wall portion is a cross covering the entire top and bottom as shown in Figure 1 (wall portion length (Z direction): 0.12 m). The wall portion shape in Example 3 can also be simply called a "cross". The results are shown in Figure 13.

[0045] Fig. 13 is a comparison of the change over time in particle mixing degree M between (Example 2) and (Example 3) added to Fig. 12. In this calculation system, in Examples 1 to 3, the particle convection suppression effect was observed compared to the comparative example where no wall was provided, and the most effective suppression of particle convection was obtained when the wall was provided in the lower half of Example 1. These arrangements can be appropriately selected based on ease of construction, conditions of use, etc.

[0046] Example 4 A simulation of Example 4 was performed in the same manner as Example 1, except that the transport container of FIG. 7(b) was used. In Example 4, a flat plate was installed as the wall on the inner bottom surface of the container as shown in FIG. 7(b). The flat plate-shaped wall has a wall length (Y direction) of 0.06 m and a wall length (Z direction) of 0.06 m. The wall shape of Example 4 can also be called the "lower half of the flat plate" for brevity. The results are shown in FIG. 14.

[0047] Example 5 A simulation of Example 5 was performed in the same manner as Example 1, except that the transport container shown in FIG. 7(a) was used. In Example 5, a flat plate was installed as the wall on the inner top surface of the container as shown in FIG. 7(a). The flat plate-shaped wall has a wall length (Y direction) of 0.06 m and a wall length (Z direction) of 0.06 m. The wall shape of Example 5 can also be called "upper half of flat plate" for brevity. The results are shown in FIG. 14.

[0048] 14 shows the change over time in the particle mixing ratio M of Example 4 and Example 5 in comparison with the Comparative Example. In this calculation system, after 60 seconds, the particle mixing ratio M of the Comparative Example was close to 0.9, whereas that of Examples 4 and 5 was kept at around 0.8.

[0049] Example 6 A simulation of Example 6 was performed in the same manner as Example 1, except that the transport container of Fig. 7(c) was used. In Example 6, L-shaped plates were installed on the entire top and bottom as the wall portion as shown in Fig. 7(c). The L-shaped wall portion has a wall length (X direction) = 0.03 m, a wall length (Y direction) = 0.03 m, and a wall length (Z direction) = 0.12 m. The wall shape of Example 6 can also be abbreviated to "L-shaped".

[0050] FIG. 15 compares (Example 6) and (Example 3) with the comparative example. In the calculation, after 60 seconds, the particle mixing degree M in the comparative example was close to 0.9, whereas it was suppressed to 0.7 or less in Examples 3 and 6. It can be seen that it is effective for the wall on which the device is installed to have corners.

[0051] The simulation conditions for the above Examples 1 to 6 are summarized in Table 1. [Table 1]

[0052] In addition, the above explanation shows typical aspects and examples of the present disclosure, but various modifications are possible. For example, in terms of cost reduction, the present disclosure replaces the spring-structured pressure plate proposed in Non-Patent Document 1, etc., but it is also possible to use it in combination with the means of the present disclosure to suppress particle convection.

[0053] Examples of the invention understood from the above disclosure are as follows. [1] A transport container comprising: A container portion having a bottom surface and a side wall surface, and a wall portion provided inside the container portion, The wall portion extends along a gravity direction, A transport container, wherein the wall portion is disposed at a position spaced apart from the side wall surface of the container portion when the container portion is seen through in the direction of gravity. [2] The transport container described in [1], wherein the wall portion is flat. [3] The container portion is rectangular or cubic, The transport container according to [1] or [2], wherein corners formed by the side wall surfaces constituting the container portion are chamfered. [4] The transfer container according to any one of [1] to [3], wherein the wall portion forms one or more corners when the transfer container is seen through from the direction of gravity. [5] The transport container according to [4], wherein when the transport container is viewed from the direction of gravity, the angle θ of the corner is 85 to 95°. [6] A transport container according to [4] or [5], wherein when the transport container is viewed from the direction of gravity, the shape of the wall portion is an L-shaped plate or a cross plate. [7] The wall portion is provided on the inner bottom surface of the container portion, [8] The transport container according to any one of [1] to [7], wherein the ratio Lg / La of the length Lg of the wall portion in the direction of gravity to the length La of the container portion in the direction of gravity is 0.40 to 0.60. [9] The transport container according to any one of [1] to [7], wherein solid particles are filled into the transport container according to any one of [1] to [7] to a height where the solid particles contact a part or the whole of the wall portion, A method for transporting solid particles, comprising moving the transport container in a vibrating environment with the filled solid particles in contact with the wall portion. [Explanation of symbols]

[0054] 1: Wall part 1-1: First flat section 1-2: Second flat section 10: Container part 10a: Cylindrical body 11: Side wall surface 12: Side wall surface 13: Side wall surface 14: Side wall surface 15: Bottom 16: Top 21: Side wall corner 22: Side wall corner 23: Side wall corner 24: Side wall corner 31: Chamfered wall 32: Chamfered wall 33: Chamfered wall 34: Chamfered wall 100: Transport container

Claims

1. A transport container comprising: A container portion having a bottom surface and a side wall surface, and a wall portion provided inside the container portion, The wall portion extends along a gravity direction, A transport container, wherein the wall portion is disposed at a position spaced apart from the side wall surface of the container portion when the container portion is seen through in the direction of gravity.

2. The transport container of claim 1 , wherein the wall portion is flat.

3. The container portion is rectangular or cubic in shape, The transfer container according to claim 1 , wherein corners formed by side walls constituting the container portion are chamfered.

4. The transport container of claim 1 , wherein the wall defines one or more corners when the transport container is viewed in a direction of gravity.

5. 5. The transport container according to claim 4, wherein the corner angle θ is 85 to 95° when the transport container is seen through from the direction of gravity.

6. The transport container according to claim 4 , wherein the wall portion has an L-shaped plate shape or a cross plate shape when the transport container is seen through from the gravity direction.

7. The wall portion is provided on an inner bottom surface of the container portion, 2. The transport container according to claim 1, wherein a ratio Lg / La of a length Lg of the wall portion in the direction of gravity to a length La of the container portion in the direction of gravity is 0.40 to 0.

60.

8. A method for producing a conveying container according to any one of claims 1 to 7, wherein solid particles are filled into the container to a height where the solid particles contact a part or the whole of the wall portion; A method for transporting solid particles, comprising moving the transport container in a vibrating environment with the filled solid particles in contact with the wall portion.

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