JP6013242B2 - Rotary kiln - Google Patents

Rotary kiln Download PDF

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JP6013242B2
JP6013242B2 JP2013056540A JP2013056540A JP6013242B2 JP 6013242 B2 JP6013242 B2 JP 6013242B2 JP 2013056540 A JP2013056540 A JP 2013056540A JP 2013056540 A JP2013056540 A JP 2013056540A JP 6013242 B2 JP6013242 B2 JP 6013242B2
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rotary kiln
stirring blade
cylindrical body
workpiece
axial direction
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JP2014181856A (en
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誠 山之口
誠 山之口
一州 鉄山
一州 鉄山
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Sumitomo Heavy Industries Ltd
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Description

本発明は、ロータリーキルンに関する。   The present invention relates to a rotary kiln.

従来、炉の内部に金属製の撹拌羽根を備え、炉の回転により被処理物を周方向に撹拌しながら焼却するロータリーキルンが知られている(例えば、特許文献1参照)。このロータリーキルンでは、撹拌羽根により効率的に被処理物が撹拌され、被処理物全体が均一に加熱されて焼却される。   2. Description of the Related Art Conventionally, there is known a rotary kiln that includes a metal stirring blade inside a furnace and incinerates an object to be processed in the circumferential direction by rotating the furnace (for example, see Patent Document 1). In this rotary kiln, the workpiece is efficiently stirred by the stirring blades, and the entire workpiece is uniformly heated and incinerated.

特開2005−9712号公報Japanese Patent Application Laid-Open No. 2005-9712

被処理物を焼却するためのロータリーキルンでは、加熱温度が900〜1000℃程度であるため、上述のように金属製の撹拌羽根で被処理物を撹拌することが可能であるが、被処理物を溶融するためのロータリーキルンでは加熱温度が1200℃以上であるため、金属製の撹拌羽根では耐久性や耐食性の観点から使用することが困難である。ここで、炉内に耐火物を内張りすると共に撹拌羽根として耐火物製のリフタを設けることも考えられるが、熱衝撃やスラグなどによる溶損が起こったり、様々な方向から加熱されることによる内張りとの熱膨張の違いで破損が起こるおそれがある。   In the rotary kiln for incinerating the workpiece, since the heating temperature is about 900 to 1000 ° C., the workpiece can be stirred with the metal stirring blade as described above. In a rotary kiln for melting, the heating temperature is 1200 ° C. or higher, so it is difficult to use a metal stirring blade from the viewpoint of durability and corrosion resistance. Here, it is conceivable that a refractory is lined in the furnace and a refractory lifter is provided as a stirring blade. However, lining caused by thermal shock, slag, etc., or heating from various directions. Damage may occur due to the difference in thermal expansion.

そこで本発明は、被処理物を溶融するためのロータリーキルンであって、撹拌羽根の耐久性や耐食性が向上されたロータリーキルンを提供することを目的とする。   Therefore, an object of the present invention is to provide a rotary kiln for melting an object to be processed, in which the durability and corrosion resistance of a stirring blade are improved.

本発明は、被処理物を溶融するためのロータリーキルンであって、外部から水冷されることが可能で被処理物が導入される金属製の筒体と、筒体に内張りされた耐火物と、筒体の内周面に接すると共に耐火物の内張り厚さを超えて耐火物の内周面から突出するように設置された金属製の撹拌羽根と、を備える、ロータリーキルンを提供する。   The present invention is a rotary kiln for melting an object to be processed, which can be water-cooled from the outside and is made of a metal cylinder into which the object to be processed is introduced, a refractory lined on the cylinder, There is provided a rotary kiln comprising: a metal stirring blade that is in contact with an inner peripheral surface of a cylindrical body and is disposed so as to protrude from the inner peripheral surface of the refractory over the thickness of the refractory.

このロータリーキルンでは、筒体に内張りされた耐火物の内周面から突出する撹拌羽根により、被処理物が周方向に撹拌される。ここで、当該撹拌羽根は、筒体の内周面に接しているため、筒体が外部から水冷されたときに、冷却水の温度が金属製の筒体から金属製の撹拌羽根に良好に伝導される。これにより、炉内が被処理物を溶融する温度にあっても、撹拌羽根が溶損しない温度に保たれる。すなわち、このロータリーキルンでは、金属製の撹拌羽根の耐久性や耐食性が向上されたものとなっている。   In this rotary kiln, the workpiece is stirred in the circumferential direction by the stirring blade protruding from the inner peripheral surface of the refractory lined on the cylinder. Here, since the stirring blade is in contact with the inner peripheral surface of the cylindrical body, when the cylindrical body is water-cooled from the outside, the temperature of the cooling water is favorably changed from the metallic cylindrical body to the metallic stirring blade. Conducted. Thereby, even if it exists in the temperature which the inside of a furnace melt | dissolves a to-be-processed object, it is kept at the temperature which a stirring blade does not melt. That is, in this rotary kiln, durability and corrosion resistance of the metal stirring blades are improved.

本発明のロータリーキルンは、耐火物の内径が、軸線方向に沿って変化していることが好ましい。この場合、軸線方向の各部位において、被処理物の進行速度が変化し、これにより被処理物の層厚も変化する。被処理物の層厚が変化する部位においては、被処理物の重量の相違による剪断力が働くため、被処理物のスリップが防止される。   In the rotary kiln of the present invention, the inner diameter of the refractory is preferably changed along the axial direction. In this case, the traveling speed of the workpiece changes at each site in the axial direction, and the layer thickness of the workpiece also changes accordingly. Since the shearing force due to the difference in the weight of the object to be processed works at the portion where the layer thickness of the object to be processed changes, slippage of the object to be processed is prevented.

本発明によれば、被処理物を溶融するためのロータリーキルンであって、撹拌羽根の耐久性や耐食性が向上されたロータリーキルンを提供することができる。   ADVANTAGE OF THE INVENTION According to this invention, it is a rotary kiln for melting a to-be-processed object, Comprising: The durability and corrosion resistance of a stirring blade can be provided.

ロータリーキルンを軸線方向から視た断面図であるIt is sectional drawing which looked at the rotary kiln from the axial direction. 図1の部分拡大図である。It is the elements on larger scale of FIG. ロータリーキルンを側方から視た断面図である。It is sectional drawing which looked at the rotary kiln from the side. 図3のIV−IV線に沿った端面図である。FIG. 4 is an end view taken along line IV-IV in FIG. 3. 図3のV−V線に沿った端面図である。FIG. 5 is an end view taken along line VV in FIG. 3. 図3のVI−VI線に沿った端面図である。FIG. 4 is an end view taken along line VI-VI in FIG. 3. 図3のVII−VII線に沿った端面図である。FIG. 4 is an end view taken along line VII-VII in FIG. 3.

以下、本発明の好適な実施形態について詳細に説明する。本実施形態のロータリーキルンは、導入される被処理物を加熱して溶融するためのものであり、運転時等必要に応じて外部から水冷されることが可能なものである。   Hereinafter, preferred embodiments of the present invention will be described in detail. The rotary kiln of the present embodiment is for heating and melting an object to be introduced, and can be water-cooled from the outside as needed, such as during operation.

図1は、ロータリーキルンを軸線方向から視た断面図、図2は、図1の部分拡大図、図3は、ロータリーキルンを側方から視た断面図である。図3に示されるように、ロータリーキルン1は軸線を傾斜させて設置されており、図示左側から導入される被処理物Wを、回転しながら軸線方向に搬送しつつ概ね前半部分で専ら焼却し、更には概ね後半部分で専ら溶融し図示右側の出口から排出するものである。なお、図3では、ロータリーキルン1の後半部分を省略している。   1 is a cross-sectional view of the rotary kiln viewed from the axial direction, FIG. 2 is a partially enlarged view of FIG. 1, and FIG. 3 is a cross-sectional view of the rotary kiln viewed from the side. As shown in FIG. 3, the rotary kiln 1 is installed with the axis inclined, and the workpiece W introduced from the left side of the drawing is incinerated mainly in the first half portion while being conveyed in the axial direction while rotating, Furthermore, it melts exclusively in the latter half and is discharged from the outlet on the right side of the figure. In FIG. 3, the latter half of the rotary kiln 1 is omitted.

図1に示されるように、ロータリーキルン1は、炭素鋼製の筒体2を備え、この筒体2の内周面2aには、レンガ(耐火物)3が内張りされている。   As shown in FIG. 1, a rotary kiln 1 includes a carbon steel cylinder 2, and a brick (refractory) 3 is lined on an inner peripheral surface 2 a of the cylinder 2.

レンガ3の内張りは、筒体2の内周面2aの曲率に応じるように断面が略台形とされたレンガ片を、筒体2の内周面2aの円周方向及び軸線方向に沿って、軸線方向視が台形となる向きで敷き詰めることで形成される。また、レンガ3の内張りは、筒体2の内部において一様ではなく、図3に示されるように、軸線方向において複数の段差3bが設けられている。すなわち、レンガ3の内径が、軸線方向に沿って変化している。   The lining of the brick 3 is a brick piece having a substantially trapezoidal cross section so as to correspond to the curvature of the inner peripheral surface 2a of the cylindrical body 2, along the circumferential direction and the axial direction of the inner peripheral surface 2a of the cylindrical body 2, It is formed by laying out in a direction in which the axial view is trapezoidal. Moreover, the lining of the brick 3 is not uniform inside the cylindrical body 2, and as shown in FIG. 3, a plurality of steps 3b are provided in the axial direction. That is, the inner diameter of the brick 3 changes along the axial direction.

また、ロータリーキルン1は、図1に示されるように、筒体2の内周面2aに接すると共に軸線Cに向かって延びるように設置されたステンレス鋼製の撹拌羽根4を備えている。撹拌羽根4は、周方向に沿って4等配(90°ごと)の位置に設置され、図3に示されるように、この4個を一組みとして、ロータリーキルン1の前半部分(図示左側部分)の前側において、軸線方向に沿って3箇所に設けられている。   Further, as shown in FIG. 1, the rotary kiln 1 includes a stirring blade 4 made of stainless steel that is in contact with the inner peripheral surface 2 a of the cylindrical body 2 and is installed so as to extend toward the axis C. The stirring blades 4 are installed at four equal positions (every 90 °) along the circumferential direction. As shown in FIG. 3, the four stirring blades 4 are used as a set, and the first half of the rotary kiln 1 (the left side in the figure). Are provided at three locations along the axial direction.

撹拌羽根4は、図2に示されるように、軸線方向視において断面T字型をなしてレンガ片同士の間に配置されており、筒体2側の一方の端部4aが筒体2の内周面2aに当接しており、軸線C側の他方の端部4bが耐火物3の内張り厚さを超えて耐火物3の内周面3aから突出している。ここで、レンガ3のうち周方向で撹拌羽根4を間に挟むレンガ片は、撹拌羽根のT字の横棒に相当する部分、すなわち筒体2側の一方の端部4aにおいて周方向に張り出した部分4c,4cを収容することができるように凹設されている。これにより、撹拌羽根4がレンガ片の間から抜け落ちないように固定されている。   As shown in FIG. 2, the stirring blade 4 has a T-shaped cross section when viewed in the axial direction and is disposed between the brick pieces, and one end portion 4 a on the cylindrical body 2 side is formed of the cylindrical body 2. The other end 4b on the axis C side protrudes from the inner peripheral surface 3a of the refractory 3 beyond the inner lining thickness of the refractory 3 and is in contact with the inner peripheral surface 2a. Here, the brick piece sandwiching the stirring blade 4 in the circumferential direction among the bricks 3 projects in the circumferential direction at a portion corresponding to the T-shaped horizontal bar of the stirring blade, that is, one end 4a on the cylindrical body 2 side. The recesses 4c and 4c are recessed so that they can be accommodated. Thereby, the stirring blade 4 is fixed so as not to fall out between the brick pieces.

以上説明したロータリーキルン1では、ロータリーキルン1の回転に伴い、撹拌羽根4により被処理物Wが周方向に持ち上げられ、転動して撹拌される。ここで、撹拌羽根4は、筒体2の内周面2aに接しているため、筒体2が外部から水冷されたときに、冷却水の温度が金属製の筒体2から金属製の撹拌羽根4に良好に伝導される。これにより、炉内が被処理物Wを溶融する温度にあっても、撹拌羽根4が溶損しない温度に保たれる。すなわち、このロータリーキルン1では、金属製の撹拌羽根4の耐久性や耐食性が向上されたものとなる。   In the rotary kiln 1 described above, the workpiece W is lifted in the circumferential direction by the stirring blade 4 as the rotary kiln 1 rotates, and is rolled and stirred. Here, since the stirring blade 4 is in contact with the inner peripheral surface 2a of the cylindrical body 2, when the cylindrical body 2 is cooled with water from the outside, the temperature of the cooling water is changed from the metallic cylindrical body 2 to the metallic stirring. Good conduction to the blades 4. Thereby, even if the inside of the furnace is at a temperature at which the workpiece W is melted, the stirring blade 4 is kept at a temperature at which it does not melt. That is, in this rotary kiln 1, durability and corrosion resistance of the metal stirring blade 4 are improved.

また、ロータリーキルン1では、軸線方向においてレンガ3に複数の段差3bが設けられているため、軸線方向の各部位において、被処理物Wの進行速度が変化し、これにより、図4〜図7に示されるように、被処理物Wの層厚が変化する。ここで、被処理物Wの層厚が変化する部位においては、被処理物Wの重量の相違による剪断力が働くため、被処理物Wのスリップが防止される。これにより、被処理物Wの撹拌が一層効率よく行われる。   Moreover, in the rotary kiln 1, since the plurality of steps 3b are provided in the brick 3 in the axial direction, the traveling speed of the workpiece W changes in each part in the axial direction, and accordingly, in FIGS. As shown, the layer thickness of the workpiece W changes. Here, since the shearing force due to the difference in the weight of the workpiece W works at the portion where the layer thickness of the workpiece W changes, the slip of the workpiece W is prevented. Thereby, the to-be-processed object W is stirred more efficiently.

また、被処理物を溶融するためのロータリーキルン1にあっては、通常、前半部分では主に被処理物Wの焼却が行われ、後半部分では主に溶融が行われることが多い。このため、図3に示されるように、被処理物Wの効率的な撹拌が必要な前半部分に撹拌羽根4及びレンガ3の段差3bを設けることで、被処理物Wの焼却、ひいてはその後の溶融が一層効率よく行われる。   Further, in the rotary kiln 1 for melting the object to be processed, the object to be processed W is usually mainly incinerated in the first half part and mostly melted in the second half part. For this reason, as shown in FIG. 3, by providing the stirring blade 4 and the step 3b of the brick 3 in the first half portion where efficient stirring of the workpiece W is necessary, the workpiece W is incinerated, and thereafter Melting is performed more efficiently.

以上、本発明の好適な実施形態について説明したが、本発明は上記実施形態に何ら限定されるものではない。例えば、上記実施形態では撹拌羽根4が周方向に沿って4個設置される例を示したが、6個又は8個等、他の個数で設置してもよい。   The preferred embodiment of the present invention has been described above, but the present invention is not limited to the above embodiment. For example, in the above-described embodiment, an example in which four stirring blades 4 are installed along the circumferential direction is shown, but other numbers such as six or eight may be installed.

また、上記実施形態では撹拌羽根4の材質をステンレス鋼としたが、本発明の効果を奏する程度の熱伝導性を有する金属、例えばINCONEL(登録商標;ニッケルを主とする合金の一種)であってもよい。   In the above embodiment, the material of the stirring blade 4 is stainless steel. However, the stirring blade 4 is a metal having thermal conductivity to the extent that the effects of the present invention are obtained, for example, INCONEL (registered trademark; a kind of alloy mainly composed of nickel). May be.

また、上記実施形態ではレンガ3の内径を軸線方向に沿って変化させるために、軸線方向において複数の段差3bを設けたが、段差3bに代えて、又は、段差3bと共に、傾斜を設けてもよい。   Moreover, in the said embodiment, in order to change the internal diameter of the brick 3 along an axial direction, although the some level | step difference 3b was provided in the axial direction, it may replace with the level | step difference 3b or may provide an inclination with the level | step difference 3b. Good.

1…ロータリーキルン、2…筒体、2a…筒体の内周面、3…レンガ(耐火物)、3a…レンガの内周面、4…撹拌羽根。   DESCRIPTION OF SYMBOLS 1 ... Rotary kiln, 2 ... Cylindrical body, 2a ... Inner peripheral surface of cylindrical body, 3 ... Brick (refractory), 3a ... Inner peripheral surface of brick, 4 ... Stirring blade.

Claims (2)

被処理物を溶融するためのロータリーキルンであって、
外部から水冷されることが可能で前記被処理物が導入される金属製の筒体と、
前記筒体に内張りされた耐火物と、
前記筒体の内周面に接すると共に前記耐火物の内張り厚さを超えて前記耐火物の内周面から突出するように設置された金属製の撹拌羽根と、を備え
前記筒体に内張りされた耐火物の内径が、前記撹拌羽根の設置された位置よりも後段において、軸線方向に沿って変化している、ロータリーキルン。
A rotary kiln for melting a workpiece,
A metal cylinder which can be cooled with water from the outside and into which the workpiece is introduced;
A refractory lined on the cylinder,
A metal stirring blade that is in contact with the inner peripheral surface of the cylindrical body and is disposed so as to protrude from the inner peripheral surface of the refractory beyond the lining thickness of the refractory , and
A rotary kiln in which an inner diameter of a refractory lined on the cylindrical body is changed along an axial direction at a later stage than a position where the stirring blade is installed .
前記筒体に内張りされた耐火物の内径が、前記軸線方向において複数の段差が設けられることによって、前記撹拌羽根の設置された位置よりも後段において、軸線方向に沿って変化している、請求項1記載のロータリーキルン。 The inner diameter of the refractory lined on the cylindrical body is changed along the axial direction at a later stage than the position where the stirring blade is installed by providing a plurality of steps in the axial direction. Item 10. A rotary kiln according to Item 1.
JP2013056540A 2013-03-19 2013-03-19 Rotary kiln Active JP6013242B2 (en)

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JPS51925B2 (en) * 1971-11-15 1976-01-12
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US6395221B1 (en) * 2000-03-23 2002-05-28 Mdy Engineering Corp. Tilting rotary furnace system for recovery of non-ferrous metals from scrap or dross and method of operation
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