JP5348718B2

JP5348718B2 - Blast furnace residue removal method and residue removal device

Info

Publication number: JP5348718B2
Application number: JP2009206193A
Authority: JP
Inventors: 正義湯越; 足水村田; 航哉井上
Original assignee: NS Plant Designing Corp; Nippon Steel Engineering Co Ltd
Current assignee: Nippon Steel Engineering Co Ltd; Nippon Steel Plant Designing Corp
Priority date: 2009-09-07
Filing date: 2009-09-07
Publication date: 2013-11-20
Anticipated expiration: 2029-09-07
Also published as: JP2011058026A

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method and an apparatus for removing residual pig iron from a blast furnace and discharging the residual pig iron at a furnace bottom without lowering the level of a rail on which a torpedo car runs. <P>SOLUTION: In the method for removing residual pig iron, the apparatus 11 for removing residual pig iron is attached to the blast furnace bottom 1. The apparatus 11 comprises a horizontal part and a standing part that branches and rises from the horizontal part and has through holes formed in axial directions on the horizontal part and the standing part, wherein the through holes of the horizontal part and the standing part communicate with each other. The method further comprises steps of: boring a furnace bottom brick 9 through the through hole of the horizontal part so as to form a residual pig iron discharge hole 10 that communicates with the furnace bottom 6; and blocking an opening of the through hole at the outside of the blast furnace after boring so as to raise the pressure inside the blast furnace, thereby enabling the residual pig iron to flow from the residual pig iron discharge hole 10 into the through hole of the horizontal part, rise through the through hole of the standing part and be removed via a discharge gutter 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、残銑を受けるトピードカーが走行するレールのレベルを下げる大改修をすることなく、炉底部の残銑を抜くことができる高炉の残銑抜き方法及び残銑抜き装置に関する。 The present invention relates to a blast furnace residue removal method and a residue removal device that can remove the residue at the bottom of the furnace without greatly modifying the level of the rail on which the topped car that receives the residue travels.

高炉の改修においては、高炉炉底部を解体する前に吹き止めた高炉内の残銑及び残滓を解体撤去するが、この吹き止めた高炉内の残銑及び残滓が多いと、残銑及び残滓を解体・除去する期間が長く必要となるのみならず、作業環境の悪い炉内での解体・除去作業が多くなることによる安全上の問題や健康上の問題ばかりでなく、残銑及び残滓を解体・撤去する費用も高くなる問題があった。 In refurbishing the blast furnace, the residues and residues in the blast furnace that were blown off before dismantling the bottom of the blast furnace are dismantled and removed. Not only does it require a long period of dismantling / removal, but it also dismantles not only the safety and health problems caused by the increased number of dismantling / removing operations in a furnace with a poor working environment, but also debris and debris・ There was a problem that the cost of removal was high.

そこで、送風停止後に出銑口レベルより下に残留する溶銑をほぼ全量炉外に排出して除去することができ、高炉吹き止めによる残銑及び残滓の解体撤去の日数を短縮しようとする高炉の吹止方法が提案されている（特許文献１参照）。 Therefore, almost all of the hot metal remaining below the discharge outlet level after the air supply is stopped can be discharged out of the furnace and removed. A blowing method has been proposed (see Patent Document 1).

特許文献１に記載された吹止方法では、高炉を吹き止めて操業を停止する際に、まず、装入物の供給を停止し、図４に示すように、高炉底部１の出銑口２を開放して出銑口レベル以上の溶銑を流出させる。出銑される溶銑は、出銑大樋３、溶銑樋１９及び溶銑傾注樋２０を流れてトピードカー４の炉口５より受銑する。 In the blowing method described in Patent Document 1, when the operation is stopped by blowing off the blast furnace, first, the supply of the charge is stopped, and as shown in FIG. To release hot metal above the outlet level. The hot metal to be fed flows through the hot metal 3, the hot metal 19, and the molten iron tilting iron 20 and is received from the furnace port 5 of the topped car 4.

出銑口２からの出銑が完了すると、出銑口２を塞ぎ、羽口から送風して炉内を高圧にし、次いで図５に示すように、鉄皮８側から炉底のれんが９の浸食面の直下域にボーリングして溶銑排出孔１０を形成する。炉底れんが９の浸食面に発生する炉底れんが９の目地割れ部と溶銑排出孔１０が連通し、出銑口レベル以下に残留していた溶銑７が目地割れ部から溶銑排出孔１０へ流れて炉外に排出される。この方法により、炉底６に残銑７がなくなり、炉内残留物の除去に要する時間が著しく短縮されるというものである。 When the extraction from the outlet 2 is completed, the outlet 2 is closed, and air is blown from the tuyere to increase the pressure inside the furnace. Next, as shown in FIG. The hot metal discharge hole 10 is formed by drilling immediately below the erosion surface. The joint crack portion of the bottom furnace brick 9 generated on the eroded surface of the bottom furnace brick 9 and the hot metal discharge hole 10 communicate with each other, and the hot metal 7 remaining below the outlet level flows from the joint crack portion to the hot metal discharge hole 10. Discharged outside the furnace. By this method, the residue 7 is eliminated from the furnace bottom 6 and the time required for removing the residue in the furnace is remarkably shortened.

特開昭５７−１０４６０５号公報JP 57-104605 A

前記特許文献１の炉底れんがをボーリングする吹止方法では、図５に示すように、トピードカーの溶銑流入口のレベルＣが炉底のレベルＢより高いため、炉底部の残銑の排出ができない。排出するためには、図５に示すように、トピードカーの炉口のレベルＣを炉底のレベルＢより下げる必要がある。 In the blowing method for boring the bottom brick of Patent Document 1, the level C at the hot metal inlet of the topped car is higher than the level B at the bottom of the furnace as shown in FIG. . In order to discharge, as shown in FIG. 5, it is necessary to lower the level C at the furnace opening of the topped car below the level B at the furnace bottom.

しかしながら、トピードカーが走行するレールのレベル下げは、レール勾配を１／１００以下にする必要があることから長距離にわたるため、改造費用が膨大となるので、実施されていない。そのため、炉底部からの残銑排出はせずに、注水による炉内冷却後に炉内側より排出しているが、鉄塊となるために長時間を要していた。 However, lowering the level of the rail on which the topped car travels has not been implemented because the rail slope needs to be 1/100 or less and is a long distance, so the cost of remodeling becomes enormous. Therefore, the residue is not discharged from the bottom of the furnace, but is discharged from the inside of the furnace after cooling in the furnace by pouring water, but it takes a long time to become an iron ingot.

そこで、本発明は、トピードカーが走行するレールのレベル下げをすることなく、炉底部の残銑を排出することができる高炉の残銑抜き方法及び残銑抜き装置を提供するものである。 Therefore, the present invention provides a blast furnace residue removal method and a residue removal device that can discharge residue at the bottom of a furnace without lowering the level of a rail on which a topped car travels.

本発明は、高炉炉底部に設けられた出銑口のレベル以下に溜まっている残銑を抜く高炉の残銑抜き方法において、水平部と、水平部から分岐させて立ち上げた立ち上げ部からなり、水平部と立ち上げ部は軸方向に貫通孔が形成されるとともに水平部の貫通孔と立ち上げ部の貫通孔が連通している残銑抜き装置を高炉炉底部に取り付け、水平部の貫通孔を通して炉底れんがをボーリングして炉底に連通する残銑排出孔を形成し、ボーリング後に貫通孔の高炉外側の開口を閉塞し、高炉内の圧力を上昇させて残銑を残銑排出孔から水平部の貫通孔に流し、さらに立ち上げ部の貫通孔を上昇させて排出することを特徴とする。 The present invention relates to a blast furnace residue removal method for removing residues accumulated below the level of a tap outlet provided at the bottom of a blast furnace furnace, from a horizontal portion and a startup portion that is branched from the horizontal portion and started up. At the bottom of the blast furnace, the horizontal part and the rising part are attached to the bottom of the blast furnace furnace with a through hole formed in the axial direction and the horizontal part's through hole communicating with the through part's through hole. Boring the bottom brick through the through hole to form a residue discharge hole communicating with the bottom of the furnace. After boring, the opening outside the blast furnace of the through hole is closed and the pressure inside the blast furnace is increased to discharge the residue. It flows from the hole to the through hole in the horizontal part, and further, the through hole in the rising part is raised and discharged.

前記構成において、残銑を立ち上げ部の貫通孔より排出樋、あるいは出銑口からの出銑時に使用する出銑大樋に排出する。 In the above-described configuration, the residue is discharged from the through hole of the rising portion to the discharge basket or the output large bowl used for output from the output port.

また、本発明は、高炉炉底部に設けられた出銑口のレベル以下に溜まっている残銑を抜く高炉の残銑抜き装置において、水平部と、水平部から分岐させて立ち上げた立ち上げ部からなり、水平部と立ち上げ部は軸方向に貫通孔が形成されるとともに、水平部の貫通孔と立ち上げ部の貫通孔は連通し、水平部の貫通孔の両端の開口のうち、一方の高炉側の開口は水平部の貫通孔を通してボーリングにより形成された、炉底に連通する残銑排出孔に連通可能であり、他方の高炉外側の開口はボーリングに使用した後に耐火物で閉塞されることを特徴とする。 The present invention also relates to a blast furnace residue removal device for removing residues accumulated below the level of the tap outlet provided at the bottom of the blast furnace furnace, and starting up by branching from the horizontal portion and the horizontal portion. The horizontal part and the rising part are formed with through-holes in the axial direction, and the horizontal part's through-hole and the rising part's through-hole communicate with each other. One opening on the blast furnace side can communicate with the residue discharge hole that is formed by boring through the horizontal through hole and communicates with the bottom of the furnace. The other opening on the outer side of the blast furnace is closed with refractory after being used for boring. It is characterized by being.

本発明は、炉内の圧力を上昇させて残銑抜き装置により残銑の排出レベルを上げて排出できるので、残銑を受けるレベルを下げるための大改修をすることなく残銑を抜くことができる。その結果、炉底に残留する残留物の除去に要する時間を大幅に減少させることができる。 Since the present invention can raise the pressure in the furnace and raise the residue discharge level by the residue removal device, the residue can be removed without major modification to reduce the level of receiving residue. it can. As a result, the time required to remove the residue remaining on the furnace bottom can be greatly reduced.

本発明の高炉の残銑抜き方法の実施例を示す図である。It is a figure which shows the Example of the residue removal method of the blast furnace of this invention. 本発明の高炉の残銑抜き装置を示す断面図である。It is sectional drawing which shows the residue removal apparatus of the blast furnace of this invention. 本発明の高炉の残銑抜き方法の別実施例を示す図である。It is a figure which shows another Example of the residue removal method of the blast furnace of this invention. 出銑口からの出銑の状態を示す図である。It is a figure which shows the state of the output from an output port. トピードカーが走行するレールのレベル下げをした場合の状態を示す図である。It is a figure which shows the state at the time of lowering | hanging the level of the rail which a topped car drive | works.

本発明の実施例を、図面を参照しながら説明する。 Embodiments of the present invention will be described with reference to the drawings.

図１において、高炉を止めて出銑口２のレベルを超える溶銑を抜き出す際、まず、装入物の供給を停止し、図１の１点鎖線で示すように、高炉炉底部１の出銑口２を開放して出銑口レベル以上の溶銑を流出させる。流出した溶銑は、出銑大樋３を流れ、トピードカー４の炉口５から受銑する。 In FIG. 1, when the blast furnace is stopped and hot metal exceeding the level of the tapping port 2 is extracted, first, the supply of charging material is stopped, and as shown by the one-dot chain line in FIG. Open mouth 2 to let molten iron above the outlet level flow out. The molten iron that has flowed out flows through the tap iron 3 and is received from the furnace port 5 of the topped car 4.

出銑口２からの出銑後、出銑口２のレベル以下で炉底６に溜まっている残銑７を抜くため、出銑口２を塞ぎ、羽口から送風して炉内を高圧にする。一方で、鉄皮８側から炉底のれんが９をボーリングし、残銑排出孔１０を形成する。 In order to remove the residue 7 accumulated in the furnace bottom 6 below the level of the tap 2 after the tap from the tap 2 is closed, the tap 2 is closed, and air is blown from the tuyere to increase the pressure in the furnace. To do. On the other hand, the brick 9 at the bottom of the furnace is bored from the iron skin 8 side to form a residue discharge hole 10.

炉底のれんが９のボーリングによる残銑排出孔１０の形成及び残銑排出孔１０による残銑抜きは、残銑抜き装置１１により行う。 Formation of the residue discharge hole 10 by boring of the bottom brick 9 and removal of the residue by the residue discharge hole 10 are performed by a residue removal device 11.

残銑抜き装置１１は、図２に示すように、水平部１２と水平部１２から分岐させて立ち上げた立ち上げ部１３からなる。水平部１２と立ち上げ部１３は、両端が開放された貫通孔１４，１５が形成された耐火物１６を鉄皮１７で被覆し、水平部１２の貫通孔１４と立ち上げ部１３の貫通孔１５は連通している。 As shown in FIG. 2, the residue removing device 11 includes a horizontal portion 12 and a rising portion 13 that is branched from the horizontal portion 12 and started up. The horizontal portion 12 and the rising portion 13 cover the refractory 16 formed with through holes 14 and 15 having both ends open with an iron skin 17, and the horizontal portion 12 and the rising portion 13 have a through hole. 15 communicates.

炉底のれんが９をボーリングして残銑排出孔１０を形成する際は、残銑抜き装置１１の水平部１２の高炉側を高炉炉底部１の鉄皮８に固定し、水平部１２の貫通孔１４にドリルを挿入して炉底のれんが９を削孔し、炉底６に残銑排出孔１０を開ける。開口後、水平部１２の貫通孔１４からドリルを抜いた後、貫通孔１４及び貫通孔１５が連通した状態を維持して貫通孔１４の開口を耐火材（マッド）で塞ぐ。 When the bottom brick 9 is bored to form the residue discharge hole 10, the blast furnace side of the horizontal portion 12 of the residue removing device 11 is fixed to the iron skin 8 of the blast furnace bottom portion 1, and the horizontal portion 12 is penetrated. A drill is inserted into the hole 14 to drill the brick 9 at the bottom of the furnace, and a residue discharge hole 10 is opened in the furnace bottom 6. After the opening, the drill is removed from the through hole 14 of the horizontal portion 12, and then the through hole 14 and the through hole 15 are maintained in communication with each other and the opening of the through hole 14 is closed with a refractory material (mud).

ボーリングにより残銑排出孔１０が形成されると、炉底６、残銑排出孔１０、貫通孔１４及び貫通孔１５が連通し、羽口からの送風により炉内圧が上がっているので、残銑７は、炉底６から残銑排出孔１０および貫通孔１４を流れ、さらに貫通孔１５を上昇して排出樋１８に流れ、トピードカー４の炉口５へ流入する。 When the residue discharge hole 10 is formed by boring, the furnace bottom 6, the residue discharge hole 10, the through hole 14 and the through hole 15 communicate with each other, and the pressure inside the furnace is increased by air blown from the tuyere. 7 flows through the residue discharge hole 10 and the through hole 14 from the furnace bottom 6, further rises through the through hole 15, flows into the discharge rod 18, and flows into the furnace port 5 of the topped car 4.

本実施例では、残銑抜き装置１１の立ち上げ部１３の排出レベルがトピードカー４の炉口５のレベルまで上昇しているので、炉内圧が低く、出銑口レベル以上の溶銑を流出させる出銑大樋３まで残銑が上昇しない場合に、この排出レベルまで残銑が上昇する炉内圧、例えば、炉内圧が約０．２ＭＰａの場合、約２ｍのレベル上げ効果があるので、排出樋１８を別途配置することにより、炉底６から排出する残銑７を、トピードカー４のレールのレベル下げをすることなくトピードカー４へ排出することが可能となる。 In the present embodiment, since the discharge level of the start-up unit 13 of the residue removing device 11 has risen to the level of the furnace port 5 of the topped car 4, the furnace pressure is low, and the discharge that causes the molten iron to flow out from the outlet level is discharged. When the residue does not rise up to the large tank 3, the furnace pressure at which the residue rises to this discharge level, for example, when the furnace pressure is about 0.2 MPa, the level raising effect is about 2 m. By arranging separately, the residue 7 discharged from the furnace bottom 6 can be discharged to the topped car 4 without lowering the level of the rail of the topped car 4.

本実施例は、炉内圧を高くすることにより、出銑口２からの出銑に使用する出銑大樋３を利用して残滓７を抜くものである。 In the present embodiment, the residue 7 is pulled out by using the output large casket 3 used for the output from the output port 2 by increasing the furnace pressure.

図３において、炉内圧が０．４ＭＰａの場合に約４ｍのレベル上げ効果があるので、炉内圧を上げることにより、通常の出銑口による出銑と同様に、通常使用している出銑大樋、溶銑樋、溶銑傾注樋を使ってトピードカー４へ排出することが可能となる。これにより改造コストを大幅に低減することができる。 In FIG. 3, when the furnace internal pressure is 0.4 MPa, there is an effect of raising the level by about 4 m. It is possible to discharge to the topped car 4 using hot metal or hot metal tilting iron. Thereby, the remodeling cost can be significantly reduced.

１：高炉底部
２：出銑口
３：出銑大樋
４：トピードカー
５：炉口
６：炉底
７：残銑
８：鉄皮
９：炉底のれんが
１０：残銑排出孔
１１：残銑抜き装置
１２：水平部
１３：立ち上げ部
１４：水平部の貫通孔
１５：立ち上げ部の貫通孔
１６：耐火物
１７：鉄皮
１８：排出樋
１９：溶銑樋
２０：溶銑傾注樋 1: Blast Furnace Bottom 2: Outlet Exit 3: Outer Odori 4: Topped Car 5: Furnace Entrance 6: Furnace Bottom 7: Residue 8: Iron Skin 9: Furnace Bottom Brick 10: Residue Exhaust Hole 11: Residue Exhaust Device 12: Horizontal portion 13: Raising portion 14: Horizontal through hole 15: Raised through hole 16: Refractory 17: Iron skin 18: Discharge iron 19: Hot metal 20: Hot metal tilt

Claims

高炉炉底部に設けられた出銑口のレベル以下に溜まっている残銑を抜く高炉の残銑抜き方法において、
水平部と、水平部から分岐させて立ち上げた立ち上げ部からなり、水平部と立ち上げ部は軸方向に貫通孔が形成されるとともに水平部の貫通孔と立ち上げ部の貫通孔が連通している残銑抜き装置を高炉炉底部に取り付け、水平部の貫通孔を通して炉底れんがをボーリングして炉底に連通する残銑排出孔を形成し、ボーリング後に貫通孔の高炉外側の開口を閉塞し、高炉内の圧力を上昇させて残銑を残銑排出孔から水平部の貫通孔に流し、さらに立ち上げ部の貫通孔を上昇させて排出することを特徴とする高炉の残銑抜き方法。 In the blast furnace residue removal method for removing residues accumulated below the level of the tap outlet provided at the bottom of the blast furnace furnace,
It consists of a horizontal part and a rising part that branches off from the horizontal part, and the horizontal part and the rising part have through-holes formed in the axial direction, and the through-holes in the horizontal part and the through-holes in the rising part communicate with each other. At the bottom of the blast furnace, the residue removal device is bored, and the bottom brick is bored through the horizontal through-hole to form a residue discharge hole communicating with the bottom of the furnace. Blast furnace residue removal, characterized by closing, raising the pressure in the blast furnace, allowing the residue to flow from the residue discharge hole to the horizontal through hole, and further raising the discharge hole of the start-up part to discharge Method.

残銑を立ち上げ部の貫通孔より排出樋に排出することを特徴とする請求項１記載の高炉の残銑抜き方法。 The blast furnace residue removing method according to claim 1, wherein the residue is discharged into a discharge rod from a through-hole of the rising portion.

残銑を立ち上げ部の貫通孔より出銑口からの出銑時に使用する出銑大樋に排出することを特徴とする請求項１記載の高炉の残銑抜き方法。 2. The method of removing a residue from a blast furnace according to claim 1, wherein the residue is discharged from a through hole of the start-up portion to an unloading large wall used when unloading from the unloading port.

高炉炉底部に設けられた出銑口のレベル以下に溜まっている残銑を抜く高炉の残銑抜き装置において、
水平部と、水平部から分岐させて立ち上げた立ち上げ部からなり、水平部と立ち上げ部は軸方向に貫通孔が形成されるとともに、水平部の貫通孔と立ち上げ部の貫通孔は連通し、水平部の貫通孔の両端の開口のうち、一方の高炉側の開口は水平部の貫通孔を通してボーリングにより形成された、炉底に連通する残銑排出孔に連通可能であり、他方の高炉外側の開口はボーリングに使用した後に耐火物で閉塞されることを特徴とする高炉の残銑抜き装置。 In the blast furnace residue removal device for removing residue accumulated below the level of the tap outlet provided at the bottom of the blast furnace furnace,
It consists of a horizontal part and a rising part that branches off from the horizontal part, and the horizontal part and the rising part are formed with through holes in the axial direction. Of the openings at both ends of the through hole in the horizontal part, one opening on the blast furnace side can be communicated with a residue discharge hole formed by boring through the through hole in the horizontal part and communicating with the bottom of the furnace. The blast furnace residue removing device is characterized in that the opening outside the blast furnace is closed with a refractory after being used for boring.