JPH0660792B2 - Exhaust gas heat recovery method for dual melting furnace - Google Patents
Exhaust gas heat recovery method for dual melting furnaceInfo
- Publication number
- JPH0660792B2 JPH0660792B2 JP61035647A JP3564786A JPH0660792B2 JP H0660792 B2 JPH0660792 B2 JP H0660792B2 JP 61035647 A JP61035647 A JP 61035647A JP 3564786 A JP3564786 A JP 3564786A JP H0660792 B2 JPH0660792 B2 JP H0660792B2
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- exhaust gas
- shell
- furnace shell
- melting
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 238000002844 melting Methods 0.000 title claims description 45
- 230000008018 melting Effects 0.000 title claims description 45
- 238000000034 method Methods 0.000 title claims description 5
- 230000009977 dual effect Effects 0.000 title description 3
- 238000011084 recovery Methods 0.000 title description 2
- 239000002184 metal Substances 0.000 claims description 23
- 239000007789 gas Substances 0.000 description 41
- 239000000446 fuel Substances 0.000 description 8
- 239000003575 carbonaceous material Substances 0.000 description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 5
- 239000001301 oxygen Substances 0.000 description 5
- 229910052760 oxygen Inorganic materials 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 4
- 239000000428 dust Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 239000002994 raw material Substances 0.000 description 3
- 230000001877 deodorizing effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- DNJIEGIFACGWOD-UHFFFAOYSA-N ethanethiol Chemical compound CCS DNJIEGIFACGWOD-UHFFFAOYSA-N 0.000 description 1
- 230000009965 odorless effect Effects 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Furnace Details (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 この発明はスクラップを溶解する溶解炉に係り、特に２
基一対の炉を有する複式溶解炉の排ガス熱回収方法に関
する。The present invention relates to a melting furnace for melting scrap, and more particularly to a melting furnace for melting scrap.
The present invention relates to an exhaust gas heat recovery method for a dual melting furnace having a pair of base furnaces.
〔従来の技術〕 従来、２基一対の炉を有する複式溶解炉として、操業側
の炉殻で発生した排ガスを待機側の炉殻内に導入するよ
うにして、待機側炉殻内に装入したスクラップを予熱す
る製鋼設備（特公昭５９−４７８３１号公報）が提案さ
れている。[Prior Art] Conventionally, as a double melting furnace having a pair of two furnaces, the exhaust gas generated in the operating side shell is introduced into the standby side shell and charged into the standby side shell. A steelmaking facility (Japanese Patent Publication No. 59-47831) for preheating such scrap has been proposed.
上記のようにして操業することにより、出鋼後に補修，
原料装入を経て通電するまでのアイドルタイムを除くこ
とができるとともに操業に入る側の炉内のスクラップは
排ガスで予熱されるため溶解時間を短縮することができ
るとされている。By operating as described above, repairing after tapping,
It is said that it is possible to eliminate the idle time from charging the raw materials to turning on the power, and to shorten the melting time because the scrap in the furnace on the side of the operation is preheated by the exhaust gas.
上記従来の複式溶解炉では、操業側の炉殻から待機側の
炉殻内へ排ガスの全量がそのまゝ導入さるので、待機側
の炉殻内を通過したのちそのまゝ排出されることにな
り、その結果、排ガスエネルギーを十分に回収すること
ができず、また待機側の炉殻内で予熱された原料から発
生した臭気は、別途脱臭設備を設けない限りそのまゝ大
気中に放出されることになり、悪臭をまき散すことにな
る。このようなことから、取扱う原料には臭気物質を含
まないもののみに制約を受けるという欠点があった。さ
らにエネルギーコスト低減のための省電力化という点で
十分とは言えない。In the above-mentioned conventional double melting furnace, the entire amount of exhaust gas is introduced from the operating side shell into the standby side shell, so that it is discharged after passing through the standby side shell. As a result, exhaust gas energy could not be sufficiently recovered, and the odor generated from the preheated raw material in the furnace shell on the standby side was released to the atmosphere unless a deodorizing facility was installed separately. It will disperse the stench. For this reason, there is a drawback in that the raw materials to be handled are limited only to those that do not contain odorous substances. Further, it is not sufficient in terms of power saving for energy cost reduction.
上記従来技術の問題点を解決するため、この発明におい
ては、２基一対の炉殻を有し、一方が操業側となるとき
他方を待機させる複式溶解炉において、上記各炉殻に連
通する初期溶湯供給用炉殻を用い、操業側の炉殻から排
出される排気ガスを前記初期溶湯供給用炉殻内へ導入し
て未然ガスを燃焼させ、この炉殻からの排ガスの全部あ
るいは一部を待機側の炉殻内へ導入してスクラップの予
熱を行なうことを特徴とするものである。また、初期溶
湯供給用溶解炉から炭材などの燃料吹込みのための初期
溶湯を受けてスクラップの吹込み溶解を行ない、本格的
な省電力化をはかる構成となっている。In order to solve the above-mentioned problems of the prior art, in the present invention, in a double melting furnace having two pairs of furnace shells, one of which is on the operating side and the other is on standby Using the molten metal supply furnace shell, the exhaust gas discharged from the operating side furnace shell is introduced into the initial molten metal supply furnace shell to burn the gas, and all or part of the exhaust gas from this furnace shell is burned. It is characterized by being introduced into the furnace shell on the standby side to preheat scrap. In addition, the scrap is blown and melted by receiving the initial molten metal for injecting fuel such as carbonaceous material from the melting furnace for supplying the initial molten metal, thus achieving a full-scale power saving.
上記の方法により、操業側の溶解炉で発生する排ガスを
初期溶湯溶解炉に導入して排ガス中の未然ガスを燃焼さ
せて高温ガスとして、この排ガスを予熱側の待機溶解炉
へ導入してクラップを予熱することで溶解操業中に発生
する排ガスエネルギーを有効的に回収し活用してスクラ
ップの高温予熱ができ、省電力、省エネルギーが達成さ
れる。By the above method, the exhaust gas generated in the melting furnace on the operation side is introduced into the initial molten metal melting furnace to burn the unexplained gas in the exhaust gas into high temperature gas, and this exhaust gas is introduced into the standby melting furnace on the preheating side to clap. By preheating, the exhaust gas energy generated during the melting operation can be effectively recovered and utilized to preheat the scrap at high temperature, thereby achieving power saving and energy saving.
以下この発明の実施例を添付図面を参照して説明する。 Embodiments of the present invention will be described below with reference to the accompanying drawings.
第１図はこの発明の一実施例を示す構成図で、符号１お
よび１′は一対の溶解炉の炉殻を示し、これら炉殻１，
１′の間に初期溶湯供給用溶解炉の炉殻２が設置されて
おり、上記一対の溶解炉の炉殻１，１′と、初期溶湯供
給用溶解炉の炉殻２とは排ガスダクト３，３′で接続さ
れている。FIG. 1 is a block diagram showing an embodiment of the present invention. Reference numerals 1 and 1'represent a pair of melting furnace shells.
The furnace shell 2 of the melting furnace for supplying the initial molten metal is installed between 1 ', and the furnace shells 1 and 1'of the pair of melting furnaces and the furnace shell 2 of the melting furnace for supplying the initial molten metal are the exhaust gas duct 3 , 3 '.
上記排ガスダクト３，３′の途中にはダンパ４，４′が
介装され、このダンパ４，４′の前後部は、炉殻と固定
のダクトとを切離すためのブレークフランジ５，５′，
６，６′で接続されている。Dampers 4, 4'are provided in the middle of the exhaust gas ducts 3, 3 ', and front and rear portions of the dampers 4, 4'are break flanges 5, 5'for separating the furnace shell and the fixed duct. ，
6, 6'are connected.
また一対の溶解炉の炉殻１，１′間は別の排ガスダクト
７で接続されており、この排ガスダクト７の炉殻１，
１′に近い位置にはブレークフランジ８，８′が設けら
れている。Further, the furnace shells 1, 1 ′ of the pair of melting furnaces are connected by another exhaust gas duct 7.
Break flanges 8 and 8'are provided at positions close to 1 '.
この排ガスダクト７と、前記初期溶湯供給用溶解炉の炉
殻２から集塵装置９に通ずるバイパスラインの排ガスダ
クト１０とが接続部１１で接続され、この接続部１１と
炉殻１，１′との間にはダンパ１２，１２′が介装さ
れ、また接続部１１と初期溶湯供給用溶解炉の炉殻２と
の間にはダンパ１３がそれぞれ介装されている。The exhaust gas duct 7 and the exhaust gas duct 10 of the bypass line leading from the furnace shell 2 of the initial molten metal supply melting furnace to the dust collector 9 are connected by a connecting portion 11, and the connecting portion 11 and the furnace shells 1, 1 '. And dampers 12 and 12 ′ are interposed between them, and a damper 13 is interposed between the connecting portion 11 and the furnace shell 2 of the melting furnace for supplying the initial molten metal.
第１図において、符号１４，１４′はスパウト、１５は
電極、１６は二次側導体、１７は給電用ケーブル、１８
は電源（炉用変圧器）、１９は溶湯供給用樋をそれぞれ
示しており、１５〜１８の給電設備は、３炉に共用され
るように設備されている。In FIG. 1, reference numerals 14 and 14 ′ are spouts, 15 is an electrode, 16 is a secondary conductor, 17 is a power supply cable, and 18
Is a power source (transformer for furnace), 19 is a gutter for supplying molten metal, and the power feeding equipments 15 to 18 are installed so as to be shared by three furnaces.
つぎに操業態様について説明する。Next, the operation mode will be described.
いま、一対の溶解炉のうち一方の炉殻１を操業側の炉と
し、他方の炉殻１′を予熱側の炉とするとき、操業中の
炉殻１では溶湯中に炭材，酸素などの燃料が吹込まれ、
炉殻１内に装入されたスクラップが溶解されている。Now, when one of the pair of melting furnaces is used as a furnace on the operating side and the other furnace shell 1'is a furnace on the preheating side, carbonaceous materials, oxygen, etc. are contained in the molten metal in the operating furnace shell 1. Fuel of
The scrap charged in the furnace shell 1 is melted.
また初期溶湯供給用溶解炉の炉殻２ではスクラップを通
電溶解中である。In the furnace shell 2 of the melting furnace for supplying the initial molten metal, the scrap is being melted by electric current.
この場合において、ダンパ１２を閉じの状態にしてお
き、操業側の溶解炉の炉殻１からの排ガスを初期溶湯供
給用溶解炉の炉殻２内に導入し、ブレークフランジ６か
ら吸引した空気（酸素）により排ガス中の未然ガスを燃
焼させて高温にし、この排ガスを予熱側の溶解炉の炉殻
１′内へ導入して炉殻１′内に装入されたスクラップを
予熱する。In this case, the damper 12 is kept closed, the exhaust gas from the furnace shell 1 of the melting furnace on the operating side is introduced into the furnace shell 2 of the melting furnace for supplying the initial molten metal, and the air sucked from the break flange 6 ( Oxygen) burns the gas in the exhaust gas to a high temperature and introduces the exhaust gas into the furnace shell 1'of the melting furnace on the preheating side to preheat the scrap charged in the furnace shell 1 '.
一方、上記排ガスの一部は、予熱側の溶解炉の炉殻１′
をバイパスして排ガスダクト１０を通り、予熱側の溶解
炉の炉殻１′からの排ガスと合流してその排ガス中に含
まれる臭気成分を熱分解して無臭にし、排ガスダクト１
０を通り、集塵装置１３を経て大気中に放出される。On the other hand, part of the exhaust gas is part of the furnace shell 1'of the melting furnace on the preheating side.
By passing through the exhaust gas duct 10 and merging with the exhaust gas from the furnace shell 1'of the melting furnace on the preheating side to thermally decompose the odorous components contained in the exhaust gas to make it odorless.
After passing through 0, it is discharged into the atmosphere through the dust collector 13.
操業側の溶解炉の炉殻１内のスクラップの溶解が完了す
ると、従来と同様の方法によりブレークフランジを開
き、炉殻１を傾動して出湯する。When the melting of the scrap in the furnace shell 1 of the melting furnace on the operation side is completed, the break flange is opened and the furnace shell 1 is tilted and tapped by a method similar to the conventional method.
また、溶解炉の炉殻１での操業が完了する直前に炉殻
１′での操業開始準備として燃料吹込みのための初期溶
湯を樋１９を通じてスパウト１４′より炉殻１′内へ供
給し１５〜１７の給電装置を炉殻１′へ一時旋回移動し
（移動装置は図示省略）、通電により炉殻内のスクラッ
プに穴を明け炭材などの吹込み溶解の際の排ガス通路を
形成させておく。そして炉殻１からの出鋼を完了したと
同時に今度は炉殻１′が操業側の炉となり、溶湯中へ炭
材，酸素等の燃料を吹込み、溶解作業を開始する。な
お、炉殻１への新たなスクラップが装入されるまでの間
は、ダンパ４，１２，１２′を閉じ、ダンパ４′１３を
開にして操業し、炉殻１の予熱準備が完了した時点でダ
ンパ４，１２を開らき、ダンパ１２′が閉の状態で定常
運転に入る。このときスクラップが臭気成分を含まない
場合には、定常運転においてダンパ１３を閉じ、排ガス
の全量を予熱に使用することもできる。一方、操業開始
準備として炉１′内のスクラップに穴明けをしている間
に初期溶湯供給用溶解炉２の炉修作業やスクラップ装入
など次の溶解のための準備をしておく。Immediately before the completion of the operation in the furnace shell 1 of the melting furnace, the initial molten metal for fuel injection is supplied from the spout 14 'into the furnace shell 1'through the trough 19 as a preparation for starting the operation in the furnace shell 1'. Temporarily move the power feeding devices 15 to 17 to the furnace shell 1 '(moving device is not shown) to open a hole in the scrap in the furnace shell by energization to form an exhaust gas passage for blowing and melting carbonaceous material. Keep it. Upon completion of tapping from the furnace shell 1, this time the furnace shell 1'becomes a furnace on the operating side, and fuel such as carbonaceous material and oxygen is blown into the molten metal to start melting work. It should be noted that the dampers 4, 12, 12 'were closed and the damper 4'13 was opened until the new scrap was charged into the furnace shell 1 for operation, and the preparation for preheating the furnace shell 1 was completed. At this time, the dampers 4 and 12 are opened, and the damper 12 'is closed to start the steady operation. At this time, if the scrap does not contain an odorous component, the damper 13 can be closed in the steady operation and the entire amount of the exhaust gas can be used for preheating. On the other hand, as preparations for starting the operation, while the scraps in the furnace 1'are being pierced, preparations for the next melting such as furnace repair work of the initial molten metal supply melting furnace 2 and charging of scraps are made.
上記実施例の説明においては、通常の省電力操業の場合
であるが、例えば電気料金が低廉な夜間などにおいては
初期溶湯生成のための溶解の合間に燃料吹込み溶解に加
えて通電溶解を併用し、操業時間の短縮をはかることも
できる。また、図示の実施例では三相交流アーク炉を表
示してあるが、これに限定されるものではなく、直流ア
ーク炉，燃料炉などによる溶解炉であってもよいことは
もちろんである。In the above description of the embodiment, it is the case of normal power-saving operation, but at the time of night when the electricity rate is low, for example, in addition to fuel injection melting, energization melting is used in combination between melting for initial molten metal formation. However, the operating time can be shortened. Further, although the three-phase AC arc furnace is shown in the illustrated embodiment, the present invention is not limited to this, and needless to say, a melting furnace such as a DC arc furnace or a fuel furnace may be used.
以上説明したように、この発明は、２基一対の炉殻を有
し、一方が操業側となるとき他方を大気させてスクラッ
プを予熱する複式溶解炉において、上記各炉殻に連通す
る初期溶湯供給用炉殻を用い、操業側の炉殻から排出さ
れる排ガスを前記初期溶湯供給用炉殻内へ導入して未然
ガスを燃焼させ、この炉殻からの排ガスの全部あるいは
一部を待機側の炉殻内へ導入してスクラップの予熱を行
なうようにしたので、炭材や酸素等の燃料の吹込みによ
り発生するＣＯを主成分とする大量の未然ガスが初期溶
湯供給用炉殻内で燃焼されて排ガスの熱エネルギーが高
められ、その高温ガスが待機側の炉殻内に導入されるた
めスクラップ予熱のための排ガスエネルギーの有効利用
を高め、予熱効率を著しく向上することができる。また
待機側の炉殻内で予熱されるスクラップから臭気が発生
する場合には、初期溶湯供給用炉殻からの排ガスの一部
を予熱側炉殻を通過させずにバイパスさせ、予熱後の排
ガスと合流させることにより臭気を高温排ガスにより熱
分解させて無臭化することができる。As described above, the present invention is a dual melting furnace having two pairs of furnace shells, one of which is on the operating side, and the other of which is exposed to the atmosphere to preheat scrap. Using the supply furnace shell, the exhaust gas discharged from the operating furnace shell is introduced into the initial molten metal supply furnace shell to burn the gas, and all or part of the exhaust gas from the furnace shell is placed on the standby side. Since the scrap was preheated by introducing it into the furnace shell of NO.2, a large amount of CO-based pre-existing gas generated by the injection of fuel such as carbonaceous materials and oxygen was generated in the initial molten metal supply furnace shell. Since the thermal energy of the exhaust gas is increased by being burned and the high-temperature gas thereof is introduced into the furnace shell on the standby side, the effective use of the exhaust gas energy for scrap preheating can be enhanced, and the preheating efficiency can be significantly improved. When odor is generated from the scrap that is preheated in the standby side shell, a part of the exhaust gas from the initial molten metal supply shell is bypassed without passing through the preheating side shell and the preheated exhaust gas is bypassed. The odor can be thermally decomposed by the high-temperature exhaust gas and deodorized by being combined with.
これらにより、炭材や酸素等の燃料吹込みにより発生す
る大量の排ガスエネルギーを有効に利用することができ
るとともに、スクラップの品質に制約を受けることがな
く、無臭にして高温予熱を行なうことができる優れた効
果がある。As a result, it is possible to effectively use a large amount of exhaust gas energy generated by injecting fuel such as carbonaceous material and oxygen, and to perform high-temperature preheating without deodorizing without being restricted by the quality of scrap. It has an excellent effect.
第１図はこの発明の一実施例を示す構成図である。 １，１′……溶解炉の炉殻、２……初期溶湯供給用溶解
炉の炉殻、３，３′，７，１０……排ガスダクト、４，
４′，１２，１２′，１３……ダンパ、９……集塵装
置。FIG. 1 is a block diagram showing an embodiment of the present invention. 1, 1 '... Melting furnace shell, 2 ... Melting furnace shell for supplying initial molten metal, 3, 3', 7, 10 ... Exhaust gas duct, 4,
4 ', 12, 12', 13 ... Damper, 9 ... Dust collector.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 樋口 貞夫 東京都千代田区大手町２丁目２番１号 石 川島播磨重工業株式会社本社内 (72)発明者 数土 文夫 千葉市千城台東３−30−１ (72)発明者 上杉 浩之 東京都杉並区本天沼１−22−20 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Sadao Higuchi 2-2-1 Otemachi, Chiyoda-ku, Tokyo Ishi Kawashima Harima Heavy Industries Co., Ltd. Main office (72) Inventor Fumio Sudo 3-30 Senjodai, Chiba, Chiba 1 (72) Inventor Hiroyuki Uesugi 1-22-20 Motomanuma, Suginami-ku, Tokyo
Claims (1)
るとき他方を待機させる複式溶解炉において、上記各炉
殻に連通する初期溶湯供給用炉殻を用い、操業側の炉殻
から排出される排ガスを前記初期溶湯供給用炉殻内へ導
入して未燃ガスを燃焼させ、この炉殻からの排ガスの全
部あるいは一部を待機側の炉殻内へ導入してスクラップ
の予熱を行なうことを特徴とする複式溶解炉の排ガス熱
回収方法。1. A double melting furnace having a pair of two furnace shells, one of which is on the operating side and the other of which is on standby, and an initial molten metal supply furnace shell communicating with each of said furnace shells is used. Exhaust gas discharged from the furnace shell is introduced into the initial molten metal supply furnace shell to burn unburned gas, and all or part of the exhaust gas from this furnace shell is introduced into the standby furnace shell to scrap. A method for recovering exhaust gas heat from a double melting furnace, characterized by performing preheating of
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61035647A JPH0660792B2 (en) | 1986-02-20 | 1986-02-20 | Exhaust gas heat recovery method for dual melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP61035647A JPH0660792B2 (en) | 1986-02-20 | 1986-02-20 | Exhaust gas heat recovery method for dual melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62194187A JPS62194187A (en) | 1987-08-26 |
| JPH0660792B2 true JPH0660792B2 (en) | 1994-08-10 |
Family
ID=12447667
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP61035647A Expired - Lifetime JPH0660792B2 (en) | 1986-02-20 | 1986-02-20 | Exhaust gas heat recovery method for dual melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0660792B2 (en) |
-
1986
- 1986-02-20 JP JP61035647A patent/JPH0660792B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62194187A (en) | 1987-08-26 |
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