Rotating ring for material seal formation, material seal method, filler for material seal formation, and rotary drum device.

Abstract

The objectives were to reduce leakage of solid material introduced into the rotating drum, to avoid malfunctions of the rotary furnace caused by newly formed clinker, and to provide smooth and stable rotational operation of the rotary furnace. [Solution] A rotating ring 11 having a partition disc 19 on its inside so as to be perpendicular to the axial direction of the rotating drum 12 is provided at least one of the ends of the cylindrical rotating drum 12, and a tangential force is applied in the tangential direction of the outer circumference of the rotating ring to rotate the rotating ring 11, thereby forming a material seal in the clearance between the rotating drum 12 and the main body fixing part 13 and the rotating ring 11.

Description

Technical Field

[0001] The present invention relates to a rotary ring for material sealing used in a rotary drum (such as a combustion furnace, rotary kiln, rotary kiln, rotary furnace, rotary drum for stirring, rotary processing furnace, etc.) used for mixing, stirring, combustion, and mixing or stirring without heat treatment involving heat treatment of various raw materials (solids, powders, solids, highly viscous gel-like substances, etc.), a material sealing method using the rotary ring for forming the material seal, a material for forming the material seal for filling the rotary ring for forming the material seal, and a rotary drum apparatus having the rotary ring for forming the material seal.

Background Art

[0002] In industry and manufacturing, processing technologies using rotary drums are essential for adding value or properly treating unwanted substances. For example, in the heat treatment of solid substances, due to the non-uniform nature of the properties, heat treatment technologies using rotary drums that can mix and stir solid substances to be processed efficiently at a relatively low cost are used.

[0003] Most of the shape changes of solid substances in the heat treatment process proceed in the direction of fining, but depending on the treatment method and the properties of the solid substances to be treated, there are also changes that proceed in the direction of aggregation and coarsening simultaneously with fining, and the properties of the solid substances to be treated are particularly influential.

[0004] Biomass fuels derived from residues, waste, etc., which are examples of solid substances to be treated, have the properties of having a large amount of ash and a small calorific value and being difficult to burn. Furthermore, a solid substance mainly composed of silica called clinker is generated by combustion. This clinker has properties similar to glass, becoming a gel-like substance with high viscosity of a partial melt when hot and a hard solid at room temperature.

[0005] In solid materials with a high ash content, the growth of clinker not only hinders stable combustion but also causes significant problems during furnace maintenance due to its strong adhesion to the furnace walls. Therefore, to suppress clinker growth and ensure stable, continuous combustion in such solid materials, there is a combustion method that employs a rotary combustion furnace to suppress clinker growth.

[0006] For example, many rotary heat treatment technologies use a "rotating drum," and in heat treatment furnaces using a rotary drum, a discontinuous clearance (gap) always occurs between the moving drum and the non-moving part of the heat treatment furnace body. Therefore, in rotary drums, a sealing structure is required to separate the rotating drum from the stationary inlet and outlet housings.

[0007] Therefore, in typical rotary drums, elastic gland packings inserted into grooves or mechanical seals disclosed in Patent Document 1 are used. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 3-251683 [Overview of the project] [Problems that the invention aims to solve]

[0009] As mentioned above, in a rotary drum, a discontinuous clearance is created between the rotating drum and the stationary inlet and outlet housings. When supplying or discharging solid material into or out of the rotary furnace from the inlet and outlet housings, solid material may leak out of the rotary drum through this clearance. This can lead to a decrease in the efficiency of utilizing the solid material remaining in the rotary furnace, a decrease in rotational speed due to solid material that has fallen out of the drum adhering to the sides of the rotary drum and the drive rollers, and damage to the drive rollers and rotary drum.

[0010] When using gland packing with general elastic properties, the sealing surface is exposed to high temperatures, and frictional heat generated by the rotation of the rotary drum causes wear on both the gland packing itself and the rotary drum body. This leads to problems such as the complexity and cost of frequent inspection and replacement.

[0011] Furthermore, Patent Document 1 proposes a mechanical seal structure. While this seal is useful as a sealing method for the purpose of complete sealing, in many cases, depending on the application, it is not necessary to completely seal the entire circumference of the rotating drum, resulting in over-specification and increased costs. Moreover, if a malfunction occurs, it is necessary to disassemble the affected part and readjust the joint surfaces of the rotating ring and stationary ring, as well as the spacing, etc., which incurs costs in terms of maintenance and servicing, and repairs take a long time, potentially leading to problems such as prolonged or frequent production stoppages at the factory.

[0012] Therefore, the present invention aims to reduce leakage of solid material introduced into a rotary drum, avoid malfunctions of the rotary furnace caused by newly formed clinker, and provide smooth and stable rotational operation of the rotary drum.

[0013] Generally speaking, the term "material seal" refers to a sealing method in which, when there is a clearance, the powder acts as a sealant in that area, limiting the leakage of powder and gas. [Means for solving the problem]

[0014] One aspect of the present invention is a rotating ring for forming a material seal, characterized in that a rotating ring having a partition disc on its inside so as to be perpendicular to the axial direction of the rotating drum is provided at least one of the ends of a cylindrical rotating drum, and a material seal is formed in the clearance between the rotating drum and the main body fixing part and the rotating ring by applying a tangential force in the tangential direction of the outer circumference of the rotating ring and rotating the rotating ring.

[0015] Aspect 2 of the present invention is a material sealing method characterized by providing a rotating ring having a partition disc on its inside so as to be perpendicular to the axial direction of the rotating drum at at least one end of a cylindrical rotating drum, and rotating the rotating ring by applying a tangential force in the tangential direction of the outer circumference of the rotating ring to rotate the rotating ring, thereby forming a material seal in the clearance between the rotating drum and the main body fixing part and the rotating ring.

[0016] A third aspect of the present invention is a material sealing method according to the second aspect, characterized in that the rotating ring is rotated at a speed different from the rotational speed of the rotating drum and in the same or opposite direction to the rotational direction of the rotating drum.

[0017] Aspect 4 of the present invention is a rotating ring for forming a material seal as described in Aspect 1, wherein a filler is pre-filled inside the rotating ring for forming a material seal.

[0018] Aspect 5 of the present invention is a material seal forming filler in which the filler described in Aspect 4 contains at least one selected from the group consisting of silica (SiO2), alumina (Al2O3), wood ash, and straw ash.

[0019] Aspect 6 of the present invention is a rotary drum device characterized by having a rotating ring for forming a material seal as described in Aspect 1. [Brief explanation of the drawing]

[0020] [Figure 1] This is a diagram illustrating one embodiment in which the present invention is applied between the side portion of the rotary furnace and the main body fixing portion of a rotary combustion furnace. [Figure 2] This is a cross-sectional view of a rotating ring for forming a material seal. [Figure 3] This is a cross-sectional view of the rotary combustion furnace of this embodiment. [Figure 4] This is an enlarged view of section 3A in Figure 3A. [Figure 5]It is an enlarged view during sealing in the A part of FIG. 3, and is an image diagram of a seal structure part by fuel and generated clinker in the seal part of the rotary ring for forming a material seal.

Embodiments for Carrying out the Invention

Examples

[0021] Hereinafter, an embodiment in which the present invention is applied between the main body fixed part of the rotary combustion furnace and the movable part of the rotary furnace will be described based on FIGS. 1 and 2. In this embodiment, an example in which the present invention is used in a rotary combustion device is described, but it is not limited to the rotary combustion device, and various raw materials (solids, powders, solids, highly viscous gel-like substances, etc.) are mixed, stirred, burned, and heat-treated. The rotary drum (combustion furnace, rotary kiln, rotary kiln, rotary furnace, rotary drum for stirring, rotary treatment furnace, etc.) used for mixing or stirring without heat treatment can be variously modified within the scope shown in the claims for the rotary drum and rotary device used, etc., and the technical scope of the present invention also includes embodiments obtained by appropriately combining the technical means disclosed in the following embodiments.

[0022] FIG. 1 shows the main configuration of the rotary combustion device 1, and shows the end portion 13 of the main body fixed part on the outlet side of the fuel supply duct 15 protruding from the fuel supply device 16 (not shown), the rotary ring 11 for forming a material seal, the drive part 14 such as a sprocket for rotating it, the rotary furnace 12, and the drive part 21 of the rotary furnace. On the outer periphery of the rotary ring 11 for forming a material seal, a sprocket or the like 14 is in contact, and the rotation can be freely controlled as a drive source.

[0023] Furthermore, the drive part 14 such as a sprocket is connected to a drive motor 22 capable of changing the rotation speed, and is configured to be able to control the rotation speed of the rotary ring 11 for forming a material seal.

[0024] The drive unit 21 of the rotary furnace is connected to a drive motor 23 that can change the rotational speed, and is configured to allow control of the rotational speed of the rotary furnace 12 separately from the rotational speed of the rotating ring 11 for material seal formation.

[0025] Furthermore, the drive system used in the drive unit 14 that applies tangential force may be selected from at least one of the following power transmission systems, such as sprockets and chains, pulleys and belts, gears, and direct friction transmission systems, depending on the rotational load between the rotary furnace 12, the rotating ring 11 for material seal formation, and the non-movable parts of the main body.

[0026] Furthermore, it is preferable to provide a partition disc 19, as shown in Figure 2, on the inside of the rotating ring 11 for material seal formation. There is no particular need to limit its height and thickness, but it is preferable that it be 0.06 to 0.16 times the radius of the rotating ring 11 for material seal formation.

[0027] Furthermore, if it is necessary to improve the degree of airtightness to prevent leakage of finely divided solid particles, not only the radial height of the partition disc 19 but also the length of the overlapping portion (width of the rotating ring 11 for material seal formation) that contacts the axial surface of the rotating furnace 12 may be changed, and a labyrinth structure with multiple baffles such as comb-shaped plates may also be used.

[0028] Furthermore, the inside of the rotating ring 11 for material seal formation may be pre-filled with a sealing material. The filling material is not particularly limited, but to further enhance the sealing performance, a material containing at least one selected from the group such as silica (SiO2), alumina (Al2O3), wood ash, and straw ash may be used.

[0029] Figure 3 shows one embodiment of the rotating ring 11 for material seal formation of the present invention when used in a rotary combustion furnace.

[0030] In Figure 3, the fuel 31, such as agricultural residues, falls from the fuel supply device 16 along the fuel supply duct 15 and is fed into the rotary furnace 12.

[0031] The fuel 31 that is introduced accumulates in the hot air outlet of the ignition device 17, and the hot air from the ignition device hits the accumulated fuel 31, causing it to ignite. The ignition device 17 then stops, but the ignited fuel 31 continues to burn on its own, transferring heat to the fuel 31 that is successively introduced from the fuel supply device 16, and combustion continues as the burning fuel moves toward the outlet due to the rotation.

[0032] Fuel 31, such as agricultural residues, moves through the rotary furnace from the inlet towards the outlet 18, being agitated as it burns, generating ash and clinker. To sustain combustion, the growth of clinker is suppressed by the physical crushing force of the rotary furnace while providing an appropriate air supply, and the amount of combustion material that overflows in proportion to the fuel supply is discharged outside the rotary furnace 12 along with the ash. The rotary furnace is rotated to create a new combustion surface for the fuel through rotational agitation and to suppress clinker growth, but depending on the fuel 31 and combustion conditions, combustion can usually be sufficiently achieved by intermittent rotation of the rotary furnace 12, and the ash and clinker are discharged from the outlet, resulting in sustained combustion.

[0033] Thus, for efficient and sustained combustion, stable operation of the rotary furnace 12 is necessary, provided that the fuel 31 does not leak from the main body fixing part 13 and the movable part of the rotary furnace 12. However, if there is no rotating ring 11 for forming a rotary material seal, fuel, ash, and clinker will leak from part 3A in Figure 3A, reducing the utilization rate of fuel and combustion heat. Furthermore, if the clearance is small, clinker will grow within the clearance, hindering the smooth and stable rotational operation of the rotary furnace.

[0034] On the other hand, when the rotating ring 11 for material seal formation is installed, as shown in Figure 4, the clearance between the rotary furnace 12 and the main body fixing part 13 is filled by the rotating ring 11 for material seal formation, thereby preventing malfunctions of the rotary furnace caused by the generation and growth of clinker, and providing smooth and stable rotational operation of the rotary furnace.

[0035] Furthermore, in a seal structure in which a rotating ring 11 for forming a material seal is provided between the lateral portion of the rotary furnace 12 and the main body fixing portion 13, perpendicular to the axial direction of the rotary furnace, and the rotating ring 11 for forming a material seal is rotated, the rotating ring 11 for forming a material seal may be configured to rotate at a speed different from the rotational speed of the rotary drum, in the same or opposite direction.

[0036] This structure prevents the clinker generated and grown in the newly created clearances on both sides of the rotating ring 11 for material seal formation from resisting the operation of the rotary furnace 12, thus enabling stable operation of the rotary furnace 12.

[0037] Furthermore, since the rotational speed of the rotary furnace 12 and the rotating ring 11 for material seal formation can be freely controlled using a drive unit 14 such as a sprocket, adhesion can be prevented even if the clinker 32 generated in the gap has different properties depending on the fuel properties and combustion conditions, leading to even more stable operation of the rotary furnace 12.

[0038] In the embodiments shown in Figures 1 and 3 above, an example is shown in which the material seal forming rotating ring 11 is installed only at one end of the rotary furnace 12 of the rotary combustion furnace. However, the material seal forming rotating ring 11 may also be installed at both ends of the rotary furnace 12 or only at the outlet side. When the material seal forming rotating ring 11 is installed at both ends of the rotary furnace 12, the height and thickness of the partition disc 19 installed inside the material seal forming rotating ring 11, the rotation direction and rotation speed of the material seal forming rotating ring 11, etc., may be the same or different settings. [Industrial applicability]

[0039] By using rotary drums for processing, additives, and agitation, added value is created. There are diverse industrial needs for manufacturing, detoxification, and volume reduction, and there is a large potential demand, so new technological developments are also expected.

[0040] With increasing demand for high-mix, low-volume production techniques replacing mass production techniques, and with the diversification of solid materials being handled, there is a need for optimal process steps tailored to the properties and processing conditions of the solid materials being handled.

[0041] This invention features a simple structure that can accommodate a variety of properties, and because it can realize a necessary and sufficient sealing structure at a relatively low cost depending on the purpose, it can meet the needs of the preceding period.

[0042] Particularly in processes involving combustion, this technology has high industrial potential because it can be applied without significantly altering the basic seal structure in processes where the refinement of solid materials and particle growth, such as clinker formation, occur simultaneously. Furthermore, in rotary combustion furnaces with moving parts, it offers the advantage and benefit of stably controlling the rotational load of the rotary furnace. Specifically, it has industrial potential in rotary combustion furnaces, incinerators, carbonization furnaces, calcination furnaces, and drying furnaces. [Explanation of Symbols]

[0043] 1. Combustion device 11. Rotating ring for material seal formation 12 Rotary drums, rotary furnaces 13 Main unit fixing part 14. Rotating ring drive unit for material seal formation 15 Fuel supply duct 16 Fuel supply system 17 Ignition system 18 Ash / Clinker Discharge Port 19 Divided disc 21 Rotary drum or rotary furnace drive unit 22 Drive motor for rotating ring for material seal formation 23. Drive motor for rotary drum or rotary furnace 31. Agricultural residues and other fuels and combustion ash 32 Clinker

Claims

1. A rotating ring for forming a material seal, characterized in that a rotating ring having a partition disc on its inside so as to be perpendicular to the axial direction of the rotating drum is provided at least one of the ends of a cylindrical rotating drum, and a material seal is formed in the clearance between the rotating drum and the main body fixing part and the rotating ring by applying a tangential force in the tangential direction of the outer circumference of the rotating ring and rotating the rotating ring.

2. A material sealing method characterized by providing a rotating ring having a partition disc on its inner side perpendicular to the axial direction of the cylindrical rotating drum at at least one of its ends, and rotating the rotating ring by applying a tangential force in the tangential direction of the outer circumference of the rotating ring to rotate the rotating ring, thereby forming a material seal in the clearance between the rotating drum and the main body fixing part and the rotating ring.

3. The material sealing method according to claim 2, characterized in that the rotating ring is rotated at a speed different from the rotational speed of the rotating drum and in the same or opposite direction to the rotational direction of the rotating drum.

4. A rotating ring for forming a material seal according to claim 1, wherein a filler is pre-filled inside the rotating ring for forming a material seal.

5. The filler described in claim 4 is silica (SiO ２ ), alumina (Al ２ O ３ A material seal forming filler containing at least one selected from the group consisting of ), wood ash, and straw ash.

6. A rotary drum device characterized by having a rotating ring for forming a material seal as described in claim 1.

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