JP6859676B2 - Raw material charging equipment for rotary hearth furnaces and raw material charging methods for rotary hearth furnaces - Google Patents

Raw material charging equipment for rotary hearth furnaces and raw material charging methods for rotary hearth furnaces Download PDF

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JP6859676B2
JP6859676B2 JP2016227178A JP2016227178A JP6859676B2 JP 6859676 B2 JP6859676 B2 JP 6859676B2 JP 2016227178 A JP2016227178 A JP 2016227178A JP 2016227178 A JP2016227178 A JP 2016227178A JP 6859676 B2 JP6859676 B2 JP 6859676B2
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raw material
rotary hearth
scraper
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JP2018084361A (en
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伊藤　直行
直行 伊藤
勝義 影山
勝義 影山
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Nippon Steel Corp
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Description

本発明は、回転する回転炉床の上に金属酸化物を含む還元用原料を装入し、この還元用原料を加熱して還元処理することにより還元金属を得る回転炉床炉の原料装入装置、及び、回転炉床炉における原料装入方法に関するものである。 In the present invention, a reduction raw material containing a metal oxide is charged on a rotating rotary hearth, and the reduction material is heated and reduced to obtain a reduced metal. It relates to an apparatus and a method of charging raw materials in a rotary hearth furnace.

製鉄所の各工場において発生する製鉄ダストには、酸化鉄等の金属酸化物が含まれている。そこで、上述の製鉄ダストを回収し、これを押出機等で成形することにより還元用原料とし、この還元用原料を加熱して還元処理することによって、還元鉄等の有価金属を得ることが可能である。
ここで、上述の還元処理を行う設備として、例えば特許文献１−３に開示された回転炉床炉（ＲＨＦ：Ｒｏｔａｒｙ Ｈｅａｒｔｈ Ｆｕｒｎａｃｅ）が用いられている。 The iron-making dust generated at each factory of the steelworks contains metal oxides such as iron oxide. Therefore, it is possible to obtain valuable metals such as reduced iron by recovering the above-mentioned iron-making dust, molding it with an extruder or the like to use it as a raw material for reduction, and heating this raw material for reduction to reduce it. Is.
Here, as the equipment for performing the above-mentioned reduction treatment, for example, a rotary hearth furnace (RHF: Rotary Hearth Furnace) disclosed in Patent Documents 1-3 is used.

この回転炉床炉においては、回転するリング状の回転炉床の上に還元用原料を装入し、回転炉床が回転して周方向の一部に設けられた還元炉内を通過する際に、還元用原料が加熱して還元され、還元鉄等の還元金属が得られる。
ここで、回転炉床においては、外周部の面積が内周部よりも広くなることから、還元用原料を内周側と外周側とで均一に装入することが難しく、還元用原料の還元状態にばらつきが生じ、歩留まりが低下するといった問題があった。そこで、例えば特許文献１−３には、回転炉床の内周側と外周側へ均一に還元用原料を装入することを目的として原料装入装置が提供されている。 In this rotary hearth furnace, when the reduction raw material is charged on the rotating ring-shaped rotary hearth, and the rotary hearth rotates and passes through the reduction furnace provided in a part in the circumferential direction. In addition, the raw material for reduction is heated and reduced to obtain a reducing metal such as reduced iron.
Here, in the rotary hearth, since the area of the outer peripheral portion is larger than that of the inner peripheral portion, it is difficult to uniformly charge the reducing raw material on the inner peripheral side and the outer peripheral side, and the reduction of the reducing raw material is performed. There was a problem that the state varied and the yield decreased. Therefore, for example, Patent Documents 1-3 provide a raw material charging device for the purpose of uniformly charging the reducing raw material to the inner peripheral side and the outer peripheral side of the rotary hearth.

特許文献１においては、回転炉床の上にテーブルを掛け渡し、このテーブル上に還元鉄用原料を仕分けする仕分け板を配置し、仕分けされた還元用原料が回転炉床の径方向の所定の位置に装入されるように、仕切り板で仕切られた領域にそれぞれ放出溝を形成したものが提案されている。
特許文献２においては、回転炉床の上に載置された装入装置の開口端部を、複数の連続直線又は曲線状に形成したものが提案されている。 In Patent Document 1, a table is hung on a rotary hearth, a sorting plate for sorting raw materials for reduced iron is arranged on the table, and the sorted reducing raw materials are predetermined in the radial direction of the rotary hearth. It has been proposed that a discharge groove is formed in each region partitioned by a partition plate so that the battery can be charged at the position.
Patent Document 2 proposes a device in which the open end of a charging device mounted on a rotary hearth is formed into a plurality of continuous straight lines or curved lines.

特許文献３においては、回転炉床の上に載置されたベルトコンベア上に複数のスクレーパを設け、ベルトコンベア上を搬送される還元用原料を切り分けるとともに装入位置を案内するものが提案されている。なお、特許文献３の図５には、還元用原料を回転炉床の回転方向上流側及び下流側にそれぞれ装入するものが提案されている。 Patent Document 3 proposes a method in which a plurality of scrapers are provided on a belt conveyor placed on a rotary hearth to separate reduction raw materials transported on the belt conveyor and guide the charging position. There is. In addition, in FIG. 5 of Patent Document 3, it is proposed that the raw material for reduction is charged to the upstream side and the downstream side in the rotation direction of the rotary hearth, respectively.

特表２００１−５２０３６４号公報Special Table 2001-520364 特開２００３−１０６７７５号公報Japanese Unexamined Patent Publication No. 2003-106775 特開２００５−２７２８９５号公報Japanese Unexamined Patent Publication No. 2005-272895

ところで、特許文献１−３に記載された原料装入装置においては、回転炉床の上に還元用原料が積み重なって装入されてしまい、回転炉床の径方向において局所的に還元用原料の分布に差が生じてしまうおそれがあった。ここで、還元用原料の装入箇所の数を増やすために仕切り板やスクレーパの設置数を増加させた場合には、還元用原料の搬送通路が狭くなり、還元用原料の詰まりが生じてしまうおそれがあった。特に、水分量が１８％以上の還元用原料の場合には、還元用原料の詰まりが生じやすくなるため、還元用原料の装入を安定して実施することができないおそれがあった。
また、還元用原料の水分量等によっては、搬送機による搬送状況等が異なるため、還元用原料の装入位置が安定せず、均一に装入することは困難であった。 By the way, in the raw material charging apparatus described in Patent Documents 1-3, the reducing raw materials are stacked and charged on the rotary hearth, and the reducing raw materials are locally charged in the radial direction of the rotary hearth. There was a risk that the distribution would differ. Here, if the number of partition plates and scrapers installed is increased in order to increase the number of charging points for the reducing raw material, the transport passage for the reducing raw material becomes narrow and the reducing raw material is clogged. There was a risk. In particular, in the case of a reducing raw material having a water content of 18% or more, clogging of the reducing raw material is likely to occur, so that there is a possibility that the charging of the reducing raw material cannot be carried out stably.
In addition, since the transport status of the reducing raw material differs depending on the water content of the reducing raw material and the like, the charging position of the reducing raw material is not stable, and it is difficult to uniformly charge the reducing raw material.

本発明は、前述した状況に鑑みてなされたものであって、回転炉床の径方向において局所的に還元用原料の分布に差が生じることなく、回転炉床に対して還元用原料を均一に装入することが可能な回転炉床炉の原料装入装置、及び、回転炉床炉における原料装入方法を提供することを目的としている。 The present invention has been made in view of the above-mentioned situation, and the reduction raw material is uniformly distributed with respect to the rotary hearth without causing a local difference in the distribution of the reduction raw material in the radial direction of the rotary hearth. It is an object of the present invention to provide a raw material charging device for a rotary hearth furnace and a raw material charging method for a rotary hearth furnace.

上記課題を解決するために、本発明に係る回転炉床炉の原料装入装置は、回転する回転炉床の上に金属酸化物を含む還元用原料を装入し、この還元用原料を加熱して還元処理することにより還元金属を製造する回転炉床炉の原料装入装置であって、前記回転炉床の回転方向に対して交差する方向に前記還元用原料を搬送する搬送機と、前記搬送機によって搬送された前記還元用原料を切り分けて前記搬送機の側面側に案内するスクレーパと、を備え、前記スクレーパは、前記還元用原料を前記回転炉床の回転方向上流側に向けて案内する上流側スクレーパと、前記還元用原料を前記回転炉床の回転方向下流側に向けて案内する下流側スクレーパと、を有し、前記回転炉床の回転方向上流側及び回転方向下流側に向けて前記還元用原料を装入する構成とされており、前記上流側スクレーパ及び前記下流側スクレーパの少なくとも一方には、設置角度を調整し、前記回転炉床の回転方向上流側に装入された前記還元用原料の前記回転炉床の径方向位置と、前記回転炉床の回転方向下流側に装入された前記還元用原料の前記回転炉床の径方向位置と、が異なるように、前記還元用原料の装入位置を調整する装入位置調整手段が設けられており、前記還元用原料の性状に応じて、前記装入位置調整手段によって前記還元用原料の装入位置を調整することを特徴としている。 In order to solve the above problems, the raw material charging device for the rotary hearth furnace according to the present invention charges the reduction raw material containing a metal oxide on the rotating rotary hearth and heats the reduction raw material. A transporter for charging the raw material of the rotary hearth furnace, which produces the reduced metal by the reduction treatment, and transports the raw material for reduction in a direction intersecting the rotation direction of the rotary hearth. The scraper comprises a scraper that cuts the reduction raw material conveyed by the conveyor and guides the reduction raw material to the side surface side of the conveyor, and the scraper directs the reduction raw material toward the upstream side in the rotation direction of the rotary hearth. It has an upstream scraper for guiding and a downstream scraper for guiding the reduction raw material toward the downstream side in the rotation direction of the rotary hearth, and is located on the upstream side in the rotation direction and the downstream side in the rotation direction of the rotary hearth. The reduction raw material is charged toward the upstream side, and at least one of the upstream side scraper and the downstream side scraper is charged to the upstream side in the rotation direction of the rotary hearth by adjusting the installation angle. The radial position of the rotary hearth of the reduction raw material and the radial position of the rotary hearth of the reduction raw material charged on the downstream side in the rotation direction of the rotary hearth are different. A charging position adjusting means for adjusting the charging position of the reducing raw material is provided, and the charging position of the reducing raw material is adjusted by the charging position adjusting means according to the properties of the reducing raw material. It is characterized by that.

この構成の回転炉床炉の原料装入装置によれば、還元用原料を前記炉床の回転方向上流側に向けて案内する上流側スクレーパと、還元用原料を回転炉床の回転方向下流側に向けて案内する下流側スクレーパと、を有し、上流側スクレーパ及び下流側スクレーパの少なくとも一方には、装入された前記還元用原料の回転炉床の径方向位置を調整する装入位置調整手段が設けられているので、上流側スクレーパによって案内された還元用原料の装入位置と下流側スクレーパによって案内された還元用原料の装入位置とが異なるように装入位置を調整することができ、回転炉床の径方向において局所的に還元用原料の分布に差が生じることなく、還元用原料を装入することが可能となる。よって、還元用原料に対して均一に還元反応させることができ、還元金属を歩留り良く製造することが可能となる。
また、水分量等の還元用原料の性状によって、スクレーパによって案内された還元用原料の装入位置がばらつくことがあるが、装入位置調整手段が設けられているので、還元用原料の性状が異なる場合であっても、回転炉床炉の径方向で還元用原料を均一に装入することができる。 According to the raw material charging device of the rotary hearth furnace having this configuration, the upstream scraper for guiding the reduction raw material toward the upstream side in the rotation direction of the hearth and the reduction raw material on the downstream side in the rotation direction of the rotary hearth. It has a downstream scraper that guides toward, and at least one of the upstream scraper and the downstream scraper has a charging position adjustment that adjusts the radial position of the rotary hearth of the reduction raw material charged. Since the means are provided, it is possible to adjust the charging position so that the charging position of the reducing raw material guided by the upstream scraper and the charging position of the reducing raw material guided by the downstream scraper are different. Therefore, the reduction raw material can be charged without causing a local difference in the distribution of the reduction raw material in the radial direction of the rotary hearth. Therefore, the reduction reaction can be uniformly carried out with the raw material for reduction, and the reduced metal can be produced with good yield.
In addition, the charging position of the reducing raw material guided by the scraper may vary depending on the properties of the reducing raw material such as the amount of water, but since the charging position adjusting means is provided, the properties of the reducing raw material are different. Even if they are different, the raw materials for reduction can be uniformly charged in the radial direction of the rotary hearth furnace.

ここで、本発明に係る回転炉床炉の原料装入装置においては、前記上流側スクレーパの設置数と前記下流側スクレーパの設置数とが異なっていることが好ましい。
この場合、上流側スクレーパの設置数と下流側スクレーパの設置数とが異なっているので、上流側スクレーパによって案内された還元用原料の装入位置に隣り合う領域に、下流側スクレーパによって案内された還元用原料の装入位置が配置されるように、還元用原料の装入位置を調整することで、回転炉床の径方向において局所的に還元用原料の分布に差が生じることなく、還元用原料を装入することが可能となる。 Here, in the raw material charging device for the rotary hearth furnace according to the present invention, it is preferable that the number of installed upstream scrapers and the number of installed downstream scrapers are different.
In this case, since the number of the upstream scraper installed and the number of the downstream scraper installed are different, the downstream scraper guides the area adjacent to the charging position of the reducing raw material guided by the upstream scraper. By adjusting the charging position of the reducing raw material so that the charging position of the reducing raw material is arranged, the reduction is performed without causing a local difference in the distribution of the reducing raw material in the radial direction of the rotary hearth. It becomes possible to charge raw materials for use.

また、本発明に係る回転炉床炉の原料装入装置においては、前記装入位置調整手段を備えた前記スクレーパは、前記還元用原料を切り分けるスクレーパ本体と、切り分けられた前記還元用原料の装入位置を案内するガイド部と、を備えていることが好ましい。
この場合、前記装入位置調整手段を備えた前記スクレーパは、前記還元用原料を切り分けるスクレーパ本体と、切り分けられた前記還元用原料の装入位置を案内するガイド部と、を備えているので、スクレーパ本体によって還元用原料を確実に切り分けることができる。また、ガイド部のみを可動させることができるので、スクレーパにたわみ等が生じることを抑制できる。よって、スクレーパ本体で切り分けられた還元用原料をガイド部によって確実に案内することが可能となる。 Further, in the raw material charging device for the rotary hearth furnace according to the present invention, the scraper provided with the charging position adjusting means has a scraper main body for cutting the reduction raw material and a device for loading the separated reduction raw material. It is preferable to provide a guide portion for guiding the entry position.
In this case, the scraper provided with the charging position adjusting means includes a scraper main body for cutting the reducing raw material and a guide portion for guiding the charged position of the separated reducing raw material. The raw material for reduction can be reliably separated by the scraper body. Further, since only the guide portion can be moved, it is possible to prevent the scraper from being bent or the like. Therefore, it is possible to reliably guide the reducing raw material cut by the scraper main body by the guide unit.

本発明に係る回転炉床炉における原料装入方法は、回転する回転炉床の上に金属酸化物を含む還元用原料を装入し、この還元用原料を加熱して還元処理することにより還元金属を製造する回転炉床炉における原料装入方法であって、前記回転炉床の回転方向に対して交差する方向に前記還元用原料を搬送し、上流側スクレーパによって搬送された前記還元用原料を切り分けて前記回転炉床の回転方向上流側に向けて案内し、下流側スクレーパによって搬送された前記還元用原料を切り分けて前記回転炉床の回転方向下流側に向けて案内する構成とされており、前記還元用原料の性状に応じて、前記上流側スクレーパ及び前記下流側スクレーパの少なくとも一方の設置角度を調整し、前記回転炉床の回転方向上流側に装入された前記還元用原料の前記回転炉床の径方向位置と、前記回転炉床の回転方向下流側に装入された前記還元用原料の前記回転炉床の径方向位置と、が異なるように、前記還元用原料の装入位置を調整することを特徴としている。 In the method for charging raw materials in a rotary hearth furnace according to the present invention, a reduction raw material containing a metal oxide is charged on a rotating rotary hearth, and the reduction raw material is heated and reduced. A method of charging raw materials in a rotary hearth furnace for producing metal, in which the reduction raw material is conveyed in a direction intersecting the rotation direction of the rotary hearth, and the reduction raw material is conveyed by an upstream scraper. Is separated and guided toward the upstream side in the rotation direction of the rotary hearth, and the reduction raw material conveyed by the downstream scraper is separated and guided toward the downstream side in the rotation direction of the rotary hearth. The installation angle of at least one of the upstream scraper and the downstream scraper is adjusted according to the properties of the reduction raw material , and the reduction raw material charged on the upstream side in the rotation direction of the rotary hearth. The reduction raw material is loaded so that the radial position of the rotary hearth and the radial position of the rotary hearth of the reduction raw material charged on the downstream side in the rotation direction of the rotary hearth are different. It is characterized by adjusting the entry position.

この構成の回転炉床炉における原料装入方法によれば、前記回転炉床の回転方向上流側に装入された前記還元用原料の前記回転炉床の径方向位置と、前記回転炉床の回転方向下流側に装入された前記還元用原料の前記回転炉床の径方向位置と、が異なるように、前記還元用原料の装入位置を調整する構成とされているので、回転炉床の径方向において局所的に還元用原料の分布に差が生じることなく、還元用原料を装入することが可能となる。よって、還元用原料に対して均一に還元反応させることができ、還元金属を歩留り良く製造することが可能となる。 According to the raw material charging method in the rotary hearth furnace having this configuration, the radial position of the rotary hearth of the reduction raw material charged on the upstream side in the rotation direction of the rotary hearth and the radial position of the rotary hearth and the rotary hearth. Since the charging position of the reducing raw material is adjusted so as to be different from the radial position of the rotating hearth of the reducing raw material charged on the downstream side in the rotation direction, the rotating hearth is configured. It is possible to charge the reduction raw material without causing a local difference in the distribution of the reduction raw material in the radial direction of the above. Therefore, the reduction reaction can be uniformly carried out with the raw material for reduction, and the reduced metal can be produced with good yield.

上述のように、本発明によれば、回転炉床の径方向において局所的に還元用原料の分布に差が生じることなく、回転炉床に対して還元用原料を均一に装入することが可能な回転炉床炉の原料装入装置、及び、回転炉床炉における原料装入方法を提供することが可能となる。 As described above, according to the present invention, the reduction raw material can be uniformly charged into the rotary hearth without causing a local difference in the distribution of the reduction raw material in the radial direction of the rotary hearth. It is possible to provide a raw material charging device for a rotary hearth furnace and a raw material charging method for a rotary hearth furnace.

本発明の一実施形態における回転炉床炉の概略説明図である。It is the schematic explanatory drawing of the rotary hearth furnace in one Embodiment of this invention. 本発明の一実施形態である回転炉床炉の原料装入装置の概略説明図である。It is the schematic explanatory drawing of the raw material charging apparatus of the rotary hearth furnace which is one Embodiment of this invention. 本実施形態においてスクレーパを固定するフレームの上面図である。It is a top view of the frame which fixes a scraper in this embodiment.

以下に、本発明の一実施形態である回転炉床炉の原料装入装置、及び、これに用いた回転炉床炉における原料装入方法について、添付した図面を参照して説明する。なお、本発明は、以下の実施形態に限定されるものではない。 Hereinafter, a raw material charging device for a rotary hearth furnace according to an embodiment of the present invention and a raw material charging method for the rotary hearth furnace used therein will be described with reference to the attached drawings. The present invention is not limited to the following embodiments.

本実施形態における回転炉床炉１は、図１に示すように、リング状の回転炉床３と、この回転炉床３の周方向の一部に設けられた還元炉５と、を備えており、原料装入装置１０から回転炉床３の上に酸化金属（酸化鉄）を含む還元用原料Ｍが装入され、この回転炉床３の上に装入された還元用原料Ｍが還元炉５内を通過する際に加熱されて還元処理され、還元金属（還元鉄）が製造される。得られた還元金属（還元鉄）は、排出部７を介して外部に排出される。 As shown in FIG. 1, the rotary hearth furnace 1 in the present embodiment includes a ring-shaped rotary hearth 3 and a reduction furnace 5 provided in a part of the rotary hearth 3 in the circumferential direction. The reduction raw material M containing a metal oxide (iron oxide) is charged onto the rotary hearth 3 from the raw material charging device 10, and the reduction raw material M charged on the rotary hearth 3 is reduced. When passing through the furnace 5, it is heated and reduced to produce a reduced metal (reduced iron). The obtained reduced metal (reduced iron) is discharged to the outside through the discharge unit 7.

回転炉床３に装入される還元用原料Ｍとしては、製鉄所の各工場において発生する製鉄ダストを回収し、回収された製鉄ダストを造粒装置９によって粒状に成形したものを用いることができる。なお、回収された製鉄ダストの水分量が多い場合には、成形前に脱水処理を行うことが好ましい。
本実施形態においては、還元用原料Ｍとして、水分量が１８％以上２５％以下の範囲内、嵩密度が１０００ｋｇ／ｍ３以上、平均粒径が１ｍｍ以下のものを用いている。そして、この還元用原料Ｍを質量速度で４ｋｇ／ｓ以上７ｋｇ／ｓ以下の範囲内で回転炉床３に装入するものとした。 As the reducing raw material M charged into the rotary hearth 3, it is possible to use a material obtained by collecting iron-making dust generated at each factory of a steel mill and granulating the collected iron-making dust by a granulator 9. it can. When the recovered iron-making dust has a large amount of water, it is preferable to perform dehydration treatment before molding.
In the present embodiment, as the reducing raw material M, a material having a water content in the range of 18% or more and 25% or less, a bulk density of 1000 kg / m 3 or more, and an average particle size of 1 mm or less is used. Then, the reduction raw material M was charged into the rotary hearth 3 in the range of 4 kg / s or more and 7 kg / s or less at a mass velocity.

そして、本実施形態である原料装入装置１０は、図２に示すように、回転炉床３の回転方向Ｒに対して交差する方向に還元用原料Ｍを搬送する搬送機１１と、搬送機１１によって搬送された原料を切り分けて搬送機１１の側面側に案内するスクレーパ２０と、を備えている。 Then, as shown in FIG. 2, the raw material charging device 10 of the present embodiment has a transporter 11 for transporting the reduction raw material M in a direction intersecting the rotation direction R of the rotary hearth 3, and a transporter. It is provided with a scraper 20 that separates the raw material conveyed by 11 and guides it to the side surface side of the transfer machine 11.

本実施形態において、搬送機１１はベルトコンベアで構成されており、このベルトコンベアの搬送方向Ｆ（延在方向）が回転炉床３の回転方向Ｒに対して直交するように配置されている。
そして、本実施形態では、この搬送機１１の両側面から還元用原料Ｍを装入し、回転炉床３の回転方向Ｒの上流側及び下流側に向けて還元用原料Ｍを装入するように構成されている。 In the present embodiment, the conveyor 11 is composed of a belt conveyor, and is arranged so that the transport direction F (extending direction) of the belt conveyor is orthogonal to the rotation direction R of the rotary hearth 3.
Then, in the present embodiment, the reduction raw material M is charged from both side surfaces of the conveyor 11, and the reduction raw material M is charged toward the upstream side and the downstream side of the rotation direction R of the rotary hearth 3. It is configured in.

スクレーパ２０は、ベルトコンベア上を搬送されてきた還元用原料Ｍを回転炉床３の回転方向Ｒ上流側に向けて案内する上流側スクレーパ２１と、還元用原料Ｍを回転炉床３の回転方向Ｒ下流側に向けて案内する下流側スクレーパ２６と、を有している。
そして、上流側スクレーパ２１及び下流側スクレーパ２６の少なくとも一方に、装入された還元用原料Ｍの回転炉床３の径方向位置を調整する装入位置調整手段が設けられている。本実施形態においては、図２に示すように、下流側スクレーパ２６に装入位置調整手段が設けられている。 The scraper 20 guides the reduction raw material M conveyed on the belt conveyor toward the upstream side of the rotation direction R of the rotary hearth 3, and the reduction raw material M guides the reduction raw material M in the rotation direction of the rotary hearth 3. It has a downstream scraper 26 that guides the vehicle toward the downstream side of the R.
Then, at least one of the upstream scraper 21 and the downstream scraper 26 is provided with a charging position adjusting means for adjusting the radial position of the rotary hearth 3 of the charged reducing raw material M. In the present embodiment, as shown in FIG. 2, the charging position adjusting means is provided on the downstream scraper 26.

ここで、本実施形態においては、上流側スクレーパ２１の設置数と下流側スクレーパ２６の設置数とが異なるように設定されている。具体的には、上流側スクレーパ２１の設置数が、下流側スクレーパ２６の設置数よりも１つ多く設定されている。これにより、上流側スクレーパ２１によって案内された還元用原料Ｍの装入位置の間に、下流側スクレーパ２６によって案内された還元用原料Ｍの装入位置が配置されるように、還元用原料Ｍの装入位置を調整することが可能となる。なお、図２に示す原料装入装置１０においては、上流側スクレーパ２１が４つ、下流側スクレーパ２６が３つ、それぞれ設置されている。 Here, in the present embodiment, the number of installed upstream scrapers 21 and the number of installed downstream scrapers 26 are set to be different. Specifically, the number of installed upstream scrapers 21 is set to be one more than the number of installed downstream scrapers 26. As a result, the reducing raw material M is arranged so that the charging position of the reducing raw material M guided by the downstream scraper 26 is arranged between the charging positions of the reducing raw material M guided by the upstream scraper 21. It is possible to adjust the charging position of. In the raw material charging device 10 shown in FIG. 2, four upstream scrapers 21 and three downstream scrapers 26 are installed.

また、本実施形態においては、下流側スクレーパ２６のうちの２つは、図２に示すように、還元用原料Ｍを切り分けるスクレーパ本体２７と、切り分けられた還元用原料Ｍの装入位置を案内するガイド部２８と、を備えている。ここで、スクレーパ本体２７は固定されており、ガイド部２８が、図２に示すように、その設置角度が調整できるように構成されている。
なお、本実施形態においては、上流側スクレーパ２１、下流側スクレーパ２６（スクレーパ本体２７及びガイド部２８）は、厚さが１ｍｍ以上６ｍｍ以下の板材で構成されている。 Further, in the present embodiment, as shown in FIG. 2, two of the downstream scrapers 26 guide the scraper main body 27 for cutting the reduction raw material M and the charging position of the cut reduction raw material M. A guide unit 28 and a guide unit 28 are provided. Here, the scraper main body 27 is fixed, and the guide portion 28 is configured so that the installation angle thereof can be adjusted as shown in FIG.
In the present embodiment, the upstream side scraper 21 and the downstream side scraper 26 (scraper main body 27 and guide portion 28) are made of a plate material having a thickness of 1 mm or more and 6 mm or less.

これら上流側スクレーパ２１及び下流側スクレーパ２６は、図３に示すように、搬送機１１の上部に設けられたフレーム１５から吊り下げられるように設置されており、その下端と搬送機１１（ベルトコンベア）の搬送面にとの間にわずかなクリアランスを有するように配置されている。
ここで、下流側スクレーパ２６のガイド部２８は、図３に示すように、その一端がフレーム１５に固定されるとともに、他端が移動部材２９に固定されており、移動部材２９に沿って他端側を移動させることで、還元用原料Ｍの装入位置が調整されるように構成されている。 As shown in FIG. 3, the upstream scraper 21 and the downstream scraper 26 are installed so as to be suspended from a frame 15 provided on the upper portion of the conveyor 11, and the lower end thereof and the conveyor 11 (belt conveyor 11). ) Is arranged so as to have a slight clearance between the and the transport surface.
Here, as shown in FIG. 3, one end of the guide portion 28 of the downstream scraper 26 is fixed to the frame 15 and the other end is fixed to the moving member 29, and the other is fixed along the moving member 29. By moving the end side, the charging position of the reduction raw material M is adjusted.

本実施形態である原料装入装置１０においては、搬送機１１のベルトコンベアで搬送された還元用原料Ｍが、上流側スクレーパ２１及び下流側スクレーパ２６によって案内され、還元用原料Ｍが搬送機１１の両側面側（回転炉床３の回転方向Ｒ上流側及び回転方向Ｒ下流側）から、回転炉床３の上へと装入される。
このとき、装入位置調整手段が設けられた下流側スクレーパ２６により、回転炉床３の回転方向Ｒ上流側に装入された還元用原料Ｍの回転炉床３における径方向位置と、回転炉床３の回転方向Ｒ下流側に装入された還元用原料Ｍの回転炉床３における径方向位置と、が異なるように、還元用原料Ｍの装入位置を調整する。 In the raw material charging device 10 of the present embodiment, the reducing raw material M conveyed by the belt conveyor of the conveying machine 11 is guided by the upstream scraper 21 and the downstream scraper 26, and the reducing raw material M is conveyed by the conveying machine 11. From both side surfaces (rotation direction R upstream side and rotation direction R downstream side of the rotary hearth 3), the rotary hearth 3 is charged onto the rotary hearth 3.
At this time, the radial position of the reduction raw material M charged upstream of the rotation direction R of the rotary hearth 3 and the rotary furnace in the rotary hearth 3 by the downstream scraper 26 provided with the charging position adjusting means. The charging position of the reducing raw material M is adjusted so as to be different from the radial position of the reducing raw material M charged on the downstream side of the rotation direction R of the floor 3 in the rotary hearth 3.

以上のような構成とされた本実施形態である回転炉床炉１の原料装入装置１０、及び、回転炉床炉１における原料装入方法によれば、還元用原料Ｍを回転炉床３の回転方向Ｒ上流側に向けて案内する上流側スクレーパ２１と、還元用原料Ｍを回転炉床３の回転方向Ｒ下流側に向けて案内する下流側スクレーパ２６と、を有し、下流側スクレーパ２６に、装入された還元用原料Ｍの回転炉床３の径方向位置を調整する装入位置調整手段が設けられているので、上流側スクレーパ２１によって案内された還元用原料Ｍの装入位置と下流側スクレーパ２６によって案内された還元用原料Ｍの装入位置とが異なるように、下流側スクレーパ２６を調整することができ、回転炉床３の径方向において局所的に還元用原料Ｍの分布に差が生じることなく、還元用原料Ｍを装入することが可能となる。これにより、還元用原料Ｍに対して均一に還元反応させることができ、還元金属（還元鉄）を歩留り良く製造することが可能となる。
また、水分量等の還元用原料Ｍの性状によって、スクレーパ２０によって案内された還元用原料Ｍの装入位置が異なることがあるが、上述のように装入位置調整手段が設けられているので、還元用原料Ｍの性状が異なる場合であっても、還元用原料Ｍを回転炉床３の径方向で均一に装入することができる。 According to the raw material charging device 10 of the rotary hearth furnace 1 and the raw material charging method in the rotary hearth furnace 1 according to the present embodiment having the above-described configuration, the reduction raw material M is used in the rotary hearth 3 It has an upstream scraper 21 for guiding the reduction raw material M toward the upstream side in the rotation direction R, and a downstream scraper 26 for guiding the reduction raw material M toward the downstream side in the rotation direction R of the rotary hearth 3. Since the charging position adjusting means for adjusting the radial position of the rotary hearth 3 of the charged reducing raw material M is provided in 26, the charging of the reducing raw material M guided by the upstream scraper 21 is provided. The downstream scraper 26 can be adjusted so that the position and the charging position of the reduction raw material M guided by the downstream scraper 26 are different, and the reduction raw material M can be locally adjusted in the radial direction of the rotary hearth 3. It is possible to charge the reduction raw material M without causing a difference in the distribution of the above. As a result, the reducing raw material M can be uniformly reduced, and the reduced metal (reduced iron) can be produced with good yield.
Further, the charging position of the reducing raw material M guided by the scraper 20 may differ depending on the properties of the reducing raw material M such as the amount of water, but since the charging position adjusting means is provided as described above. Even when the properties of the reducing raw material M are different, the reducing raw material M can be uniformly charged in the radial direction of the rotary hearth 3.

また、本実施形態においては、上流側スクレーパ２１の設置数と下流側スクレーパ２６の設置数とが異なっており、上流側スクレーパ２１の設置数が下流側スクレーパ２６の設置数よりも１つ多く設定されているので、上流側スクレーパ２１によって案内された還元用原料Ｍの装入位置の間に、下流側スクレーパ２６によって案内された還元用原料Ｍの装入位置が配置されるように、還元用原料Ｍの装入位置を調整することで、還元用原料Ｍが積み重なるように装入されず、回転炉床３の径方向において局所的に還元用原料Ｍの分布に差が生じることなく、還元用原料Ｍを装入することが可能となる。 Further, in the present embodiment, the number of the upstream scraper 21 installed and the number of the downstream scraper 26 installed are different, and the number of the upstream scraper 21 installed is set to be one more than the number of the downstream scraper 26 installed. Therefore, the charging position of the reducing raw material M guided by the downstream scraper 26 is arranged between the charging positions of the reducing raw material M guided by the upstream scraper 21. By adjusting the charging position of the raw material M, the reducing raw materials M are not charged so as to be stacked, and the reduction is performed without causing a local difference in the distribution of the reducing raw materials M in the radial direction of the rotary hearth 3. It becomes possible to charge the raw material M.

さらに、本実施形態においては、装入位置調整手段を備えた下流側スクレーパ２６が、還元用原料Ｍを切り分けるスクレーパ本体２７と、切り分けられた還元用原料Ｍの装入位置を案内するガイド部２８と、を備えているので、スクレーパ本体２７によって還元用原料Ｍを確実に切り分けることができる。また、ガイド部２８のみを可動させることができるので、下流側スクレーパ２６にたわみ等が生じることを抑制できる。よって、スクレーパ本体２７で切り分けられた還元用原料Ｍをガイド部２８によって確実に案内することが可能となる。 Further, in the present embodiment, the downstream scraper 26 provided with the charging position adjusting means guides the scraper main body 27 for cutting the reduced raw material M and the charged position of the cut reduction raw material M 28. And, so that the reduction raw material M can be reliably separated by the scraper main body 27. Further, since only the guide portion 28 can be moved, it is possible to prevent the downstream scraper 26 from being bent or the like. Therefore, the reduction raw material M cut by the scraper main body 27 can be reliably guided by the guide unit 28.

以上、本発明の一実施形態である回転炉床炉の原料装入装置、及び、回転炉床炉における原料装入方法について説明したが、本発明はこれに限定されることはなく、その発明の技術的思想を逸脱しない範囲で適宜変更可能である。
例えば、本実施形態においては、搬送機がベルトコンベアで構成されたものとして説明したが、これに限定されることはなく、その他の搬送手段によって構成されたものであってもよい。 The raw material charging device for the rotary hearth furnace and the raw material charging method for the rotary hearth furnace, which are one embodiment of the present invention, have been described above, but the present invention is not limited thereto, and the invention thereof. It can be changed as appropriate without departing from the technical idea of.
For example, in the present embodiment, the transport machine has been described as being composed of a belt conveyor, but the present invention is not limited to this, and it may be configured by other transport means.

また、本実施形態では、スクレーパ本体とガイド部とを備えたものとして説明したが、これに限定されることはなく、スクレーパ自体の角度を調整するように構成したものであってもよい。
さらに、スクレーパの設置数は、本実施形態に限定されることはなく、設備の大きさ等に応じて適宜設定することが好ましい。 Further, in the present embodiment, it has been described that the scraper main body and the guide portion are provided, but the present invention is not limited to this, and the scraper itself may be configured to adjust the angle.
Further, the number of scrapers installed is not limited to the present embodiment, and it is preferable to appropriately set the number of scrapers according to the size of the equipment and the like.

また、還元用原料として、水分量が１８％以上２５％以下の範囲内、嵩密度が１０００ｋｇ／ｍ３以上、平均粒径が１ｍｍ以下のものを用いるものとして説明したが、これに限定されることはなく、還元用原料の性状に特に限定はない。ただし、水分量の多いものは、安定して装入することが困難であるため、本発明の回転炉床炉の原料装入装置を用いることが好ましい。
さらに、還元用原料Ｍを質量速度で４ｋｇ／ｓ以上７ｋｇ／ｓ以下の範囲内で回転炉床に装入するものとして説明したが、還元用原料の装入速度に特に限定はない。 Further, as the raw material for reduction, it has been described that a raw material having a water content in the range of 18% or more and 25% or less, a bulk density of 1000 kg / m 3 or more, and an average particle size of 1 mm or less is used, but the present invention is limited to this. There is no particular limitation on the properties of the raw material for reduction. However, since it is difficult to stably charge a material having a large amount of water, it is preferable to use the raw material charging device for the rotary hearth furnace of the present invention.
Further, although it has been described that the reducing raw material M is charged into the rotary hearth within the range of 4 kg / s or more and 7 kg / s or less in terms of mass velocity, the charging rate of the reducing raw material is not particularly limited.

以下に、本発明の効果を確認すべく、実施した実験結果について説明する。
本発明例として、図２に示す本実施形態である原料装入装置を用いて原料の装入を実施した。このとき、搬送機のベルトコンベアのベルト長さを１５６００ｍｍ、ベルト幅を１０５０ｍｍとした。
従来例として、図２に示す原料装入装置において、固定した上流側スクレーパ及び下流側スクレーパをそれぞれ４つ設けた。 The results of experiments carried out in order to confirm the effects of the present invention will be described below.
As an example of the present invention, the raw material was charged using the raw material charging device according to the present embodiment shown in FIG. At this time, the belt length of the belt conveyor of the conveyor was set to 15600 mm, and the belt width was set to 1050 mm.
As a conventional example, in the raw material charging device shown in FIG. 2, four fixed upstream scrapers and four downstream scrapers are provided.

装入する還元用原料として、酸化鉄を含む製鉄ダストを成形し、嵩密度が１６００ｋｇ／ｍ３、体積平均粒径が１ｍｍ以下、水分を２２％含有するものとした。この成形した原料を、質量速度４．８ｋｇ／ｓで搬送した。
そして、回転炉床炉を用いて還元鉄を製造し、製造歩留りを比較した。 Iron-making dust containing iron oxide was molded as a raw material for reduction to be charged, and the bulk density was 1600 kg / m 3 , the volume average particle size was 1 mm or less, and the water content was 22%. The molded raw material was conveyed at a mass rate of 4.8 kg / s.
Then, reduced iron was produced using a rotary hearth furnace, and the production yields were compared.

本発明例においては、比較例に比べて歩留りが６％改善された。本発明例によれば、回転炉床に還元用原料を均一に装入でき、還元用原料の還元を安定して実施できることが確認された。 In the example of the present invention, the yield was improved by 6% as compared with the comparative example. According to the example of the present invention, it was confirmed that the reduction raw material can be uniformly charged into the rotary hearth and the reduction of the reduction raw material can be stably carried out.

１ 回転炉床炉
３ 回転炉床
１０ 原料装入装置
１１ 搬送機
２０ スクレーパ
２１ 上流側スクレーパ
２６ 下流側スクレーパ
２７ スクレーパ本体
２８ ガイド部 1 Rotary hearth furnace 3 Rotary hearth 10 Raw material charging device 11 Conveyor 20 Scraper 21 Upstream scraper 26 Downstream scraper 27 Scraper body 28 Guide

Claims (4)

回転する回転炉床の上に金属酸化物を含む還元用原料を装入し、この還元用原料を加熱して還元処理することにより還元金属を製造する回転炉床炉の原料装入装置であって、
前記回転炉床の回転方向に対して交差する方向に前記還元用原料を搬送する搬送機と、前記搬送機によって搬送された前記還元用原料を切り分けて前記搬送機の側面側に案内するスクレーパと、を備え、
前記スクレーパは、前記還元用原料を前記回転炉床の回転方向上流側に向けて案内する上流側スクレーパと、前記還元用原料を前記回転炉床の回転方向下流側に向けて案内する下流側スクレーパと、を有し、前記回転炉床の回転方向上流側及び回転方向下流側に向けて前記還元用原料を装入する構成とされており、
前記上流側スクレーパ及び前記下流側スクレーパの少なくとも一方には、設置角度を調整し、前記回転炉床の回転方向上流側に装入された前記還元用原料の前記回転炉床の径方向位置と、前記回転炉床の回転方向下流側に装入された前記還元用原料の前記回転炉床の径方向位置と、が異なるように、前記還元用原料の装入位置を調整する装入位置調整手段が設けられており、
前記還元用原料の性状に応じて、前記装入位置調整手段によって前記還元用原料の装入位置を調整することを特徴とする回転炉床炉の原料装入装置。 It is a raw material charging device for a rotary hearth furnace that produces a reducing metal by charging a reducing raw material containing a metal oxide on a rotating rotary hearth and heating the reducing raw material for reduction treatment. hand,
A carrier that conveys the reducing raw material in a direction intersecting the rotation direction of the rotary hearth, and a scraper that separates the reducing raw material conveyed by the conveying machine and guides the reducing raw material to the side surface side of the conveying machine. , Equipped with
The scraper is an upstream scraper that guides the reduction raw material toward the upstream side in the rotation direction of the rotary hearth, and a downstream scraper that guides the reduction raw material toward the downstream side in the rotation direction of the rotary hearth. And, the reduction raw material is charged toward the upstream side in the rotation direction and the downstream side in the rotation direction of the rotary hearth.
The installation angle of at least one of the upstream scraper and the downstream scraper is adjusted so that the radial position of the rotary hearth of the reduction raw material charged on the upstream side in the rotational direction of the rotary hearth and the radial position of the rotary hearth. Charging position adjusting means for adjusting the charging position of the reducing raw material so as to be different from the radial position of the rotating hearth of the reducing raw material charged on the downstream side in the rotation direction of the rotating hearth. Is provided ,
A raw material charging device for a rotary hearth furnace, characterized in that the charging position of the reducing raw material is adjusted by the charging position adjusting means according to the properties of the reducing raw material. 前記上流側スクレーパの設置数と前記下流側スクレーパの設置数とが異なっていることを特徴とする請求項１に記載の回転炉床炉の原料装入装置。 The raw material charging device for a rotary hearth furnace according to claim 1, wherein the number of installed upstream scrapers and the number of installed downstream scrapers are different. 前記装入位置調整手段を備えた前記スクレーパは、前記還元用原料を切り分けるスクレーパ本体と、切り分けられた前記還元用原料の装入位置を案内するガイド部と、を備えていることを特徴とする請求項１又は請求項２に記載の回転炉床炉の原料装入装置。 The scraper provided with the charging position adjusting means is characterized by including a scraper main body for cutting the reduction raw material and a guide portion for guiding the charged position of the separated reduction raw material. The raw material charging device for a rotary hearth furnace according to claim 1 or 2. 回転する回転炉床の上に金属酸化物を含む還元用原料を装入し、この還元用原料を加熱して還元処理することにより還元金属を製造する回転炉床炉における原料装入方法であって、
前記回転炉床の回転方向に対して交差する方向に前記還元用原料を搬送し、上流側スクレーパによって搬送された前記還元用原料を切り分けて前記回転炉床の回転方向上流側に向けて案内し、下流側スクレーパによって搬送された前記還元用原料を切り分けて前記回転炉床の回転方向下流側に向けて案内する構成とされており、
前記還元用原料の性状に応じて、前記上流側スクレーパ及び前記下流側スクレーパの少なくとも一方の設置角度を調整し、前記回転炉床の回転方向上流側に装入された前記還元用原料の前記回転炉床の径方向位置と、前記回転炉床の回転方向下流側に装入された前記還元用原料の前記回転炉床の径方向位置と、が異なるように、前記還元用原料の装入位置を調整することを特徴とする回転炉床炉における原料装入方法。 This is a raw material charging method in a rotary hearth furnace in which a reducing metal containing a metal oxide is charged on a rotating rotary hearth, and the reducing metal is produced by heating and reducing the reducing raw material. hand,
The reduction raw material is conveyed in a direction intersecting the rotation direction of the rotary hearth, and the reduction raw material conveyed by the upstream scraper is cut and guided toward the upstream side in the rotation direction of the rotary hearth. , The reduction raw material conveyed by the downstream scraper is separated and guided toward the downstream side in the rotational direction of the rotary hearth.
The installation angle of at least one of the upstream scraper and the downstream scraper is adjusted according to the properties of the reduction raw material, and the rotation of the reduction raw material charged on the upstream side in the rotation direction of the rotary hearth. The charging position of the reducing raw material is different from the radial position of the hearth and the radial position of the rotating hearth of the reducing raw material charged on the downstream side of the rotating hearth in the rotational direction. A method of charging raw materials in a rotary hearth furnace, which is characterized by adjusting.
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