Conveying device, and conveying method

Abstract

To provide a conveying device or the like which can appropriately convey brittle material.SOLUTION: A conveying device includes a supply port to which brittle material is supplied, a discharge port from which the brittle material is discharged, and a connection part which connects the supply port and discharge port. In the connection part, a supply port side of at least a part of a region between the supply port and the discharge port is positioned higher than a discharge port side. The region has a speed adjustment part including a rotation shaft, a rotation part rotating around the rotation shaft, and a plurality of blade parts arranged in a circumferential direction of the rotation part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a transport device and a transport method for transporting a brittle material. [Background technology]

[0002] An example of the raw material for ironmaking used in the blast furnace process is coke. High-quality caking coal is the raw material for coke. The price of caking coal has been rising sharply in recent years due to excessive demand. To address this issue, new coke manufacturing technologies, such as the molded coal blending method, have been developed to utilize low-grade coal.

[0003] In the molded coal blending method, at least a portion of the coal charged into a coke oven is replaced with molded coal. Molded 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 a hopper, a chute, and a belt conveyor. When the briquettes are charged into the coke oven, not only the briquettes alone are charged into the coke oven, but also a mixture of the briquettes and the powdered coal is charged.

[0005] Briquettes are formed by briquetting coal particles so that they are close to each other. When such briquettes are heated to soften or melt, the fusion is promoted. This allows the blending ratio of low-grade non-caking coal to be increased. The higher the blending ratio of briquettes to total coal, the more non-caking coal can be used as raw material for coke.

[0006] In addition, 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 the productivity of the coke.

[0007] Molded coal breaks down into powder when it collides with the walls of the conveying line or with other molded coal. When molded coal breaks down, non-caking coal is released to the outside. The area where the non-caking coal is released becomes brittle, which reduces the strength of the coke. In the molded coal blending method, it is necessary to suppress the powdering of molded coal during transportation.

[0008] One method for suppressing powdering of the molded coal is to reduce the impact of the molded coal, which is disclosed in Patent Document 1 as a method for reducing the impact of the molded coal, for example, by forming a coke layer at the bottom of a coke oven and then charging the molded coal.

[0009] The uneven surface of the coke layer formed at the bottom of the coke oven increases the contact area between the briquettes and the coke. This disperses the impact of the briquettes falling freely. When the briquettes collide with the coke layer, the tiny coke particles in the gaps between the briquettes move. As a result, the kinetic energy of the collision is wasted, and the energy acting on the briquettes is reduced.

[0010] Patent Document 2 discloses a sinter ore powdering prevention device in which a plurality of sinter ore flow rate suppression plates are fixed perpendicular to the flow direction of the sinter ore on a slope provided between the hot crusher and the cooler of a sintering machine. In Patent Document 2, the flow rate of the sinter ore is reduced because the flow rate suppression plates or the raw material pools on the flow rate suppression plates act as resistance in the flow direction. [Prior art documents] [Patent documents]

[0011] [Patent Document 1] JP 2018-070873 A [Patent Document 2] Special Publication No. 4-005917 Summary of the Invention [Problem to be solved by the invention]

[0012] However, the method of Patent Document 1 is specialized for preventing pulverization in a coke oven. For this reason, for example, in a general hopper or chute on a conveying line, briquettes are discharged intermittently or continuously, so even if coke is laid at the point where the briquettes fall, it is discharged together with the briquettes. Therefore, the effect described in Patent Document 1 cannot be obtained with this member, and the problem of pulverization still remains.

[0013] In addition, when non-caking coal is released from the molded coal due to the impact during transportation, it adheres to the walls of the transport path. If the molded coal is transported in this state, the molded coal may adhere to the walls of the transport path. Granular molded coal that adheres to the walls of the transport path repeatedly combines with other granular molded coal to form lumps. As a result, the lump-shaped molded coal may hinder the transport of the molded coal. This phenomenon tends to occur more easily as the particle size of the molded coal becomes smaller.

[0014] In addition, when the raw material contains a large amount of moisture due to rainfall, etc., a water film may be formed on the surface of the molded coal due to the liquid bridging force. The molded coal with the water film may become lumpy as described above or adhere to the wall surface of the transport path.

[0015] Furthermore, if the molded coal contains a large amount of moisture, the clay content may swell with the moisture and become sticky. In addition, molded coal that has become sticky may become lumpy as described above or adhere to the walls of the transport path. Hereinafter, the obstruction of the transport of molded coal due to such a state of molded coal is also referred to as the risk of raw material adhesion.

[0016] When a flow rate suppression plate as in Patent Document 2 is applied to a portion where fine grains are present to form a raw material pool, granular raw materials are retained in the raw material pool. The retained granular raw materials are a cause of the formation of the above-mentioned lump raw materials. For this reason, there is still a risk that the transportation of raw materials for ironmaking will be hindered.

[0017] Patent Document 2 also describes a method in which a flow rate suppressing plate is combined with a pan conveyor, and raw materials remaining on the flow rate suppressing plate are discharged to a conveying path by the rotation of the conveyor. If such a configuration is provided in, for example, a hopper or a chute, large-scale equipment is required, so it is practically difficult to apply the configuration described in Patent Document 2 to anything other than a conveyor. The above-mentioned problem can occur not only with molded coal, but also with all iron-making raw materials such as sintered ore that are prone to cracking and chipping during transportation.

[0018] Furthermore, brittle materials are fragile materials that absorb little energy when broken. The above problems occur not only when raw materials for steelmaking are used, but also when brittle materials are transported.

[0019] The present invention has been made in consideration of the above problems, and has an object to provide a conveying device etc. capable of appropriately conveying brittle materials. [Means for solving the problem]

[0020] In order to solve the above problems, the present invention has the following features. [1] A conveying device having a supply port through which a brittle material is supplied, a discharge port through which the brittle material is discharged, and a connection portion that connects the supply port and the discharge port, The connection portion has at least a part of a region between the supply port and the discharge port, the supply port side being positioned higher than the discharge port side, A conveying device in which the region is provided with a speed adjustment section including a rotating shaft, a rotating section that rotates around the axis of the rotating shaft, and a plurality of blade sections arranged circumferentially of the rotating section. [2] a supply amount adjusting unit that adjusts the amount of the brittle material supplied from the supply port; The conveying device according to [1], wherein the supply amount adjustment unit adjusts the amount of the brittle material according to the diameter of the rotating part. [3] a supply amount adjusting unit that adjusts the amount of the brittle material supplied from the supply port; The conveying device according to [1] or [2], wherein the front supply amount adjustment unit adjusts the amount of the brittle material according to the volume of the storage unit of the speed adjustment unit defined by the rotating unit and the blade unit. [4] The blade portion is provided in a number of 4 to 10. The conveying device according to any one of [1] to [3], wherein the radial length of the rotating part of the blade is 5 to 14 times the average grain size of the brittle material. [5] A method for transporting a brittle material using the transport device according to any one of [1] to [3], a supply step of supplying the brittle material from the supply port; an adjusting step of adjusting a moving speed of the brittle material by the speed adjusting unit; a discharge step of discharging the brittle material from the discharge port; The transport method comprises: [6] A method for transporting a brittle material using the transport device according to [4], a supply step of supplying the brittle material from the supply port; an adjusting step of adjusting a moving speed of the brittle material by the speed adjusting unit; a discharge step of discharging the brittle material from the discharge port; The transport method comprises: [7] The conveying method according to [6], wherein in the adjusting step, a collision angle between the brittle material and the blade portion is 55 to 70°, and the rotating portion is rotated by the falling energy of the brittle material. Effect of the Invention

[0021] The conveying device of the present invention has a speed adjusting unit including a rotating unit that rotates around the axis of the rotating shaft and a plurality of blade units arranged in the circumferential direction of the rotating unit. Therefore, when the brittle material is supplied from the supply port, the molded coal pushes down the blade unit. This causes the rotating unit to rotate around the axis of the rotating shaft. Therefore, the moving speed of the molded coal from the supply port can be decelerated. As a result, it is possible to soften the impact when the brittle material comes into contact with the wall of the conveying device. This makes it possible to suppress the powdering of the brittle material, and to properly convey the brittle material. [Brief description of the drawings]

[0022] [Figure 1] FIG. 2 is an explanatory diagram showing a configuration of a transport device. [Diagram 2] 2 is an explanatory diagram showing a speed adjusting unit in FIG. 1. [Diagram 3] 4 is a flow chart of a transport method using the transport device. [Figure 4] FIG. 1 is an explanatory diagram showing an embodiment in which the transport device can be applied. [Diagram 5] 11 is an explanatory diagram showing another embodiment in which the conveying device can be applied. FIG. [Figure 6] 1 is a graph showing the device rotation rate and powdering rate in Test Example 1. [Figure 7] 1 is a graph showing the device rotation rate and powdering rate in Test Example 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0023] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows the configuration of a conveying device. The conveying device 100 is a device for conveying brittle materials. As shown in FIG. 1, brittle materials include materials that are prone to cracking and chipping due to impact during conveyance. Examples of such brittle materials include raw materials for iron making, minerals, etc. Examples of raw materials for iron making include sintered ore, molded coal, HBI (Hot Briquetted Iron), etc. Examples of minerals include limestone, mudstone, silica stone, etc. In this embodiment, an example will be described in which the conveying device 100 is used as a conveying device for molded coal.

[0024] The molded coal SM as a brittle material is not particularly limited, but is formed, for example, in a spherical shape. The average particle size (equivalent sphere diameter) of the molded coal SM can be obtained, for example, as follows. The particle size is measured with a vernier caliper, and the equivalent sphere diameter in equivalent volume is calculated using the particle size by a known calculation formula. The average value of any number of equivalent sphere diameters can be set as the average particle size (equivalent sphere diameter) of the molded coal SM.

[0025] In this embodiment, the conveying device 100 is formed in a cylindrical shape. For example, a hopper or a chute can be used as the conveying device 100. In this embodiment, an example in which a chute is used as the conveying device 100 will be described.

[0026] The transport device 100 has a supply port 10 through which the molded coal SM is supplied, a discharge port 20 through which the molded coal SM is discharged, and a connection portion 30 that connects the supply port 10 and the discharge port 20.

[0027] The supply port 10 is provided on the upper end side of the conveying device 100. A belt conveyor 41 is connected to the supply port 10. In other words, the end of the belt conveyor 41 provided on the supply port 10 side is located above the supply port 10. The molded coal SM supplied from the belt conveyor 41 is charged into the conveying device 100 through the supply port 10.

[0028] A supply amount adjustment unit 41a that adjusts the conveying speed of the belt conveyor 41 is connected to the belt conveyor 41. The supply amount adjustment unit 41a adjusts the amount of brittle material supplied from the supply port 10 by increasing or decreasing the conveying speed of the belt conveyor 41.

[0029] The discharge outlet 20 is provided on the lower end side of the transport device 100. A belt conveyor 42 is connected to the discharge outlet 20. In other words, the starting end of the belt conveyor 42 is located below the discharge outlet 20. The molded coal SM discharged from the discharge outlet 20 is supplied to the belt conveyor 42 and transported to a predetermined position.

[0030] In the connection portion 30, at least a part of the region 31 between the supply port 10 and the discharge port 20 is located at a higher position on the supply port 10 side than on the discharge port 20 side. In this embodiment, the supply port 10 and the discharge port 20 are arranged in the vertical direction. The region 31 is formed to extend in the arrangement direction of the supply port 10 and the discharge port 20, i.e., in the vertical direction.

[0031] A speed adjusting unit 50 for adjusting the moving speed of the briquettes is provided in the region 31. The briquettes charged from the supply port 10 reach the region 31 by free fall, and after the moving speed is adjusted by the speed adjusting unit 50, they are discharged from the discharge port 20.

[0032] The speed adjusting unit 50 may be provided, for example, on a falling trajectory of the molded coal SM supplied from the supply port 10. By disposing the speed adjusting unit 50 in this manner, it becomes possible to efficiently transmit the falling energy of the molded coal SM to the speed adjusting unit 50. As a result, it becomes possible to efficiently decelerate the moving speed of the molded coal SM.

[0033] The speed adjusting unit 50 may be provided midway between the supply port 10 and the discharge port 20. If the speed adjusting unit 50 is provided on the supply port 10 side, the distance from the speed adjusting unit 50 to the discharge port 20 becomes longer. This increases the falling speed of the molded coal SM that has left the speed adjusting unit 50, which may cause the molded coal to be pulverized. If the speed adjusting unit 50 is provided on the discharge port 20 side, the distance from the supply port 10 to the speed adjusting unit 50 becomes longer. This increases the falling speed of the molded coal SM, which may cause the molded coal to be pulverized when it reaches the speed adjusting unit 50.

[0034] Fig. 2 shows a side view of the speed adjustment unit 50. As shown in Fig. 2, the speed adjustment unit 50 includes a rotating shaft 51, a rotating unit 52 that rotates around the axis of the rotating shaft 51, and a plurality of blade units 53 arranged in the circumferential direction of the rotating unit 52.

[0035] The rotating shaft 51 is not particularly limited, but is formed, for example, in a rod shape. The rotating shaft 51 is attached to the wall of the connection part 30 via a bearing member such as a bearing. The rotating shaft 51 is attached to the connection part 30 so as to be rotatable around its axis.

[0036] The rotating part 52 is formed in a disk shape. The center of the rotating part 52 is inserted into the tip side of the rotating shaft 51 and attached to the rotating part 52. When the rotating shaft 51 rotates, the rotating part 52 rotates around the axis of the rotating shaft 51 in accordance with the rotation.

[0037] The blade portion 53 is a plate-like member formed to extend in the radial direction of the rotating portion 52. The blade portion 53 is preferably formed across the axial direction of the rotating portion 52. The number of the blade portions 53 is not particularly limited, but for example, it is preferable that 4 to 10 blade portions are provided, and more preferably 6 to 10 blade portions are provided.

[0038] Providing four or more blades 53 allows efficient rotation of rotating part 52. Furthermore, providing ten or less blades 53 allows the force applied to each blade 53 to be appropriate, and the rotation speed of rotating part 52 to be appropriate.

[0039] The speed adjustment unit 50 may rotate the rotating unit 52 by the falling energy of the molded coal SM. A member such as a motor that rotates the rotating shaft 51 may be used as an auxiliary for rotating the rotating unit 52, but preferably, the molded coal SM is caused to push the blade unit 53 downward. In other words, it is preferable to rotate the rotating unit 52 by the falling energy of the molded coal SM. By rotating the rotating unit 52 in this way, power for rotating the rotating unit 52 is not required, so that space can be saved and running costs can be reduced.

[0040] 2, the molded coal SM is preferably supplied to the conveying device 100 so that the collision angle α between the molded coal SM and the blade portions 53 is 55 to 70°. The arrow indicated by the dashed line in the figure indicates the trajectory of the molded coal SM immediately before it collides with the blade portions 53. The collision angle α is the angle at which the blade portion 53 adjacent to one blade portion 53 collides with the molded coal SM when the blade portion 53 is positioned in a vertical direction.

[0041] The collision angle α is not particularly limited, but can be adjusted, for example, by at least one of the supply speed of the molded coal SM, the positional relationship between the molded coal SM and the rotating part 52, the shape of the blade portion 53 of the rotating part 52, the number of the blade portions 53 of the rotating part 52, and the arrangement spacing.

[0042] By setting the collision angle α to 55 to 70°, it is possible to appropriately achieve the efficiency with which the falling energy of the molded coal SM is converted into the rotational energy of the rotating part 52. As a result, it is possible to appropriately supply the amount of molded coal SM required to rotate the rotating part 52, and it is possible to suppress pulverization of the molded coal SM.

[0043] For example, the relationship between the length L of the blade portion 53 in the radial direction of the rotating portion 52 and the average particle size d of the briquettes SM is preferably 5≦L / d≦14.

[0044] By making L / d 5≦L, it is possible to obtain a sufficient torque to rotate the rotating part 52 by the falling energy of the molded coal SM. Also, by making L / d ≦14, it is possible to keep the force required to rotate the rotating part 52 within an appropriate range, and it is possible to rotate the rotating part 52 by the falling energy of the molded coal SM.

[0045] The speed adjustment unit 50 has a storage unit 54 defined by a rotating unit 52 and a pair of blade units 53 arranged in the circumferential direction of the rotating unit 52. The volume of the storage unit 54 is determined by the circumferential length of the rotating unit 52, the axial length of the rotating unit 52, and the radial length of the blade units 53 relative to the rotating unit 52.

[0046] The blade portion 53 is located on the falling trajectory of the molded coal SM. The molded coal SM supplied from the supply conveyor hits the blade portion 53 and is stored in the storage portion 54. When the molded coal SM is supplied to the conveying device 100, the blade portion 53 is pushed downward. This causes the rotating portion 52 to rotate around the axis of the rotating shaft 51. At that time, the molded coal SM supplied from the supply port 10 is decelerated by contacting the blade portion 53 or the molded coal SM piled up in the storage portion 54.

[0047] Furthermore, the supply amount adjusting unit 41a may adjust the amount of brittle material supplied from the supply port 10 in accordance with the diameter of the rotating unit 52. Furthermore, the supply amount adjusting unit 41a may adjust the amount of brittle material supplied in accordance with the volume of the storage unit 54. In this manner, the supply amount adjusting unit 41a adjusts the amount of brittle material supplied from the supply port 10, thereby adjusting the rotation speed of the rotating unit 52. In other words, the conveying device 100 can convey the brittle material at an appropriate speed, thereby making it possible to suppress powdering of the brittle material.

[0048] A method for transporting a brittle material using the transport device 100 described above will now be described. FIG. 3 shows a flow of the transport method using the transport device 100. As shown in FIG. 3, the brittle material is supplied from the supply port 10 and a supply step is performed (step S01). Next, the speed adjustment unit 50 adjusts the moving speed of the brittle material and an adjustment step is performed (step S02). Finally, the brittle material is discharged from the discharge port 20 and a discharge step is performed (step S03). In the adjustment step of step S02, it is preferable to rotate the rotating unit 52 by the falling energy of the brittle material as described above.

[0049] As described above, the conveying device 100 etc. of the present invention has a speed adjusting unit including the rotating unit 52 that rotates around the axis of the rotating shaft 51 and a plurality of blade units 53 arranged in the circumferential direction of the rotating unit 52. Therefore, when the molded coal SM is supplied from the supply port 10, the molded coal SM pushes down the blade units 53. This causes the rotating unit 52 to rotate around the axis of the rotating shaft 51. The molded coal SM accommodated in the storage unit 54 is discharged toward the discharge port 20 by the rotation of the rotating unit 52. In this way, the molded coal SM accommodated in the storage unit 54 is periodically discharged, thereby reducing the risk of raw material adhesion.

[0050] The position where the molded coal SM is discharged from the storage section 54 is lower than the supply port 10. The falling energy of the molded coal SM when it is discharged from the storage section 54 is lower than when it falls from the supply port 10 to the discharge port 20. Therefore, it is possible to reduce the impact when the molded coal SM comes into contact with the wall of the transport device 100 or the belt conveyor 42 on the discharge port side. This makes it possible to suppress pulverization of the molded coal SM.

[0051] The conveying device is not limited to a hopper or a chute, and may be any device formed so that the brittle material falls freely. FIG. 4 shows an embodiment in which the conveying device can be applied. As shown in FIG. 4, a manufacturing machine 61 for manufacturing the brittle material, a belt conveyor 62 for conveying the brittle material discharged from the manufacturing machine 61, and a vertical conveyor 63 connected to an end of the belt conveyor 62 are provided as a conveying line. The brittle material discharged from the end of the belt conveyor 62 is supplied to the vertical conveyor 63 by free falling. The conveying device may be provided in a supply area 71 in which molded coal is supplied from the belt conveyor 62 to the vertical conveyor 63 in this manner.

[0052] Fig. 5 shows another embodiment in which the conveying device can be applied. As shown in Fig. 5, a vertical conveyor 63, an inclined conveyor 64 connected to an end of the vertical conveyor 63, and a belt conveyor 65 connected to an end of the inclined conveyor 64 are provided as a conveying line.

[0053] The brittle material discharged from the end of the vertical conveyor 63 is supplied to the inclined conveyor 64 by free falling. The transport device may be provided in a supply area 72 where the brittle material is supplied from the vertical conveyor 63 to the inclined conveyor 64 in this manner.

[0054] The brittle material discharged from the end of the inclined conveyor 64 is supplied to the belt conveyor 65 by free fall. The transport device may be provided in a supply area 73 where the brittle material is supplied from the inclined conveyor 64 to the belt conveyor 65 in this manner.

[0055] Even when a conveying device is provided in this manner, it is possible to obtain the same effects as those of the above-described embodiment. EXAMPLES

[0056] (Test Example 1) Using a test device simulating the conveying device described in the above embodiment, the rotational state of the rotating part and the pulverization rate of the brittle material were investigated when the number of blades of the blade part was changed. The width and diameter of the rotating part of the conveying device were constant. Molded coal was used as the brittle material. The collision angle between the molded coal and the blade part was approximately 60°.

[0057] The briquettes on the conveyor installed on the discharge side were collected and sieved. The sieve mesh was 15 mm. The briquettes above the sieve were considered to be sound, and the briquettes below the sieve were considered to be powdered, and the weights of each were measured. The weight of the powdered material was divided by the total weight of the sound material and the powdered material to calculate the "powdering rate."

[0058] The rotational behavior of the rotating part was verified by determining the probability that the rotating part would rotate when the molded coal was charged. Specifically, when the molded coal was charged 10 times, the probability that the rotating part would rotate due to the falling energy of the molded coal was calculated as the "equipment rotation rate". When calculating the equipment rotation rate, cases in which the rotating part did not rotate and cases in which the rotation of the rotating part stopped while the molded coal was being charged were not counted as rotations of the rotating part. The amount of molded coal charged was 30 kg. The molded coal was charged for 10 seconds at a speed of 3 kg per second.

[0059] Furthermore, the length L of the blades was set to L / d=8, where d is the average particle size (equivalent sphere diameter) of the molded coal. The average particle size d of the molded coal was calculated as follows. The particle size was measured with a vernier caliper, and the equivalent sphere diameter in volume was calculated using the particle size. The average value of the equivalent sphere diameters of 10 particles in volume was calculated as the average particle size. The relationship between the number of blades, the device rotation rate, and the powdering rate is shown in Figure 6.

[0060] As shown in Fig. 6, the pulverization rate exceeded 20% by mass when no speed adjusting unit was provided, i.e., when no blade unit was provided. In contrast, in the example where the speed adjusting unit 50 was provided, i.e., where multiple blade units were provided, the pulverization rate was below 20% by mass in all cases. In particular, when the number of blade units was four or more, the pulverization rate was below 10% by mass. Moreover, from the viewpoint of preventing pulverization of the molded charcoal, it is preferable to provide four or more blade units.

[0061] That is, by providing four or more blades, it is possible to easily deposit the molded coal in the storage section of the speed adjusting section. Therefore, the molded coal supplied from the supply port can be efficiently brought into contact with the molded coal deposited in the blades or the storage section. As a result, the moving speed of the molded coal supplied from the supply port can be decelerated.

[0062] Furthermore, the device rotation rate increased as the number of blades increased. In particular, when the number of blades was between 4 and 10, the device rotation rate was 100%. Even when the number of blades was 11, the device rotation rate was 90%. From the viewpoint of smooth rotation of the rotating parts, it is preferable to provide four or more blades.

[0063] Furthermore, by limiting the number of blades to 10 or less, the force applied to the blades by contact with the molded coal supplied from the supply port can be made appropriate, thereby optimizing the rotation of the rotating part.

[0064] (Test Example 2) The length of the blade portion, the device rotation rate, and the powdering rate were investigated. The number of blade portions was eight. The blade length L and the average particle size (equivalent sphere diameter) d of the molded coal were calculated as follows. The particle size was measured with a vernier caliper, and the equivalent sphere diameter in equivalent volume was calculated using the particle size. The average value of the equivalent sphere diameters of 10 particles in equivalent volume was calculated as the average particle size. Based on these values, L / d was calculated. The other conditions and measurement methods were the same as those in Test Example 1, so explanations will be omitted. The length of the blade portion, the device rotation rate, and the powdering rate are shown in Figure 7.

[0065] 7, the powdering rate exceeded 20% by mass when no speed adjusting unit was provided, i.e., when no blade unit was provided. In contrast, in the example where the speed adjusting unit 50 was provided, i.e., where multiple blade units were provided, the powdering rate was 10% by mass or less.

[0066] Also, there was a tendency for the device rotation rate to increase as L / d increased. In particular, the device rotation rate was 100% when 5≦L / d≦14. In order to rotate the rotating part in a more preferable manner, it is preferable to set the blade length L relative to the molded coal diameter (sphere equivalent diameter) d to 5≦L / d≦14.

[0067] In the case of the test example 2 where the raw material powder prevention device did not rotate, most of the charged briquettes remained piled up in the storage section even after the charging of the briquettes was completed. It was thought that an appropriate powdering rate could not be obtained by evaluating the powdering rate in such a state. Therefore, the data when the rotating section rotated appropriately was used for the powdering rate shown in Figure 7. [Explanation of symbols]

[0068] 100 Transport device 10 Supply inlet 20 Outlet 30 Connection 31 areas 41a Supply amount adjustment section 50 Speed ​​adjustment section 51 Rotation axis 52 Rotating section 53 Wing 54 Storage unit

Claims

1. A conveying device having a supply port through which a brittle material is supplied, a discharge port through which the brittle material is discharged, and a connection portion that connects the supply port and the discharge port, The connection portion has at least a part of a region between the supply port and the discharge port, the supply port side being positioned higher than the discharge port side, A conveying device in which the region is provided with a speed adjustment section including a rotating shaft, a rotating section that rotates around the axis of the rotating shaft, and a plurality of blade sections arranged circumferentially of the rotating section.

2. a supply amount adjusting unit that adjusts the amount of the brittle material supplied from the supply port; The conveying device according to claim 1 , wherein the supply amount adjusting unit adjusts the amount of the brittle material depending on a diameter of the rotating part.

3. a supply amount adjusting unit that adjusts the amount of the brittle material supplied from the supply port; The conveying device according to claim 1 , wherein the supply amount adjusting section adjusts the amount of the brittle material depending on a volume of an accommodation section of the speed adjusting section defined by the rotating section and the blade section.

4. a supply amount adjusting unit that adjusts the amount of the brittle material supplied from the supply port; The conveying device according to claim 2 , wherein the supply amount adjusting section adjusts the amount of the brittle material depending on a volume of an accommodation section of the speed adjusting section defined by the rotating section and the blade section.

5. The blade portion is provided in a number of 4 to 10, 5. The conveying device according to claim 1, wherein the radial length of the rotating portion of the blade is 5 to 14 times the average grain size of the brittle material.

6. A conveying method using the conveying device according to any one of claims 1 to 4, a supply step of supplying the brittle material from the supply port; an adjusting step of adjusting a moving speed of the brittle material by the speed adjusting unit; a discharge step of discharging the brittle material from the discharge port; The transport method comprises:

7. A conveying method using the conveying device according to claim 5, a supply step of supplying the brittle material from the supply port; an adjusting step of adjusting a moving speed of the brittle material by the speed adjusting unit; a discharge step of discharging the brittle material from the discharge port; The transport method comprises:

8. 7. The conveying method according to claim 6, wherein in the adjusting step, a collision angle between the brittle material and the blade portion is 55 to 70 degrees, and the rotating portion is rotated by the falling energy of the brittle material.

9. 8. The conveying method according to claim 7, wherein in the adjusting step, a collision angle between the brittle material and the blade portion is 55 to 70 degrees, and the rotating portion is rotated by the falling energy of the brittle material.

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