JP2009019786A - 回転炉床式還元炉の排ガス処理装置および方法 - Google Patents
回転炉床式還元炉の排ガス処理装置および方法 Download PDFInfo
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- 229910004298 SiO 2 Inorganic materials 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/008—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases cleaning gases
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/10—Making spongy iron or liquid steel, by direct processes in hearth-type furnaces
- C21B13/105—Rotary hearth-type furnaces
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B1/00—Preliminary treatment of ores or scrap
- C22B1/14—Agglomerating; Briquetting; Binding; Granulating
- C22B1/16—Sintering; Agglomerating
- C22B1/216—Sintering; Agglomerating in rotary furnaces
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/14—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment
- F27B9/16—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity characterised by the path of the charge during treatment; characterised by the means by which the charge is moved during treatment the charge moving in a circular or arcuate path
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B9/00—Furnaces through which the charge is moved mechanically, e.g. of tunnel type; Similar furnaces in which the charge moves by gravity
- F27B9/30—Details, accessories, or equipment peculiar to furnaces of these types
- F27B9/3044—Furnace regenerators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
- F27D17/004—Systems for reclaiming waste heat
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D21/00—Heat-exchange apparatus not covered by any of the groups F28D1/00 - F28D20/00
- F28D21/0001—Recuperative heat exchangers
- F28D21/0003—Recuperative heat exchangers the heat being recuperated from exhaust gases
- F28D21/001—Recuperative heat exchangers the heat being recuperated from exhaust gases for thermal power plants or industrial processes
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/10—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically
- F28D7/106—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged one within the other, e.g. concentrically consisting of two coaxial conduits or modules of two coaxial conduits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F13/00—Arrangements for modifying heat-transfer, e.g. increasing, decreasing
- F28F13/18—Arrangements for modifying heat-transfer, e.g. increasing, decreasing by applying coatings, e.g. radiation-absorbing, radiation-reflecting; by surface treatment, e.g. polishing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F19/00—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers
- F28F19/02—Preventing the formation of deposits or corrosion, e.g. by using filters or scrapers by using coatings, e.g. vitreous or enamel coatings
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C2100/00—Exhaust gas
- C21C2100/06—Energy from waste gas used in other processes
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
- C22B7/00—Working up raw materials other than ores, e.g. scrap, to produce non-ferrous metals and compounds thereof; Methods of a general interest or applied to the winning of more than two metals
- C22B7/02—Working-up flue dust
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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
- 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
- Y02P10/10—Reduction of greenhouse gas [GHG] emissions
- Y02P10/134—Reduction of greenhouse gas [GHG] emissions by avoiding CO2, e.g. using hydrogen
-
- 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
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- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
- Manufacture Of Iron (AREA)
- Manufacture And Refinement Of Metals (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
- Tunnel Furnaces (AREA)
Abstract
【解決手段】回転炉床式還元炉からの排ガスGの処理流路の第1段階に、内筒22の内部を排ガスGが流通するとともに、内筒と外筒21の間を空気Aが流通するように構成された輻射型熱交換器2を設置した排ガス処理装置であって、内筒の内面に炭化珪素系耐火物などの高熱伝導性耐火物23を施工した。
【選択図】図2
Description
例えば、特許文献2、3には、回転炉床炉の排ガス処理の第1段階として、水を冷媒とする廃熱ボイラを設置し、その後段に空気を冷媒とする熱交換器を設置した排ガス処理装置において、廃熱ボイラの内表面温度を400℃以下に制御するとともに、廃熱ボイラ内面に付着したダストをスートブローやハンマリング機構で除去する方法が開示されている。
先ず、回転炉床炉1から1100〜1450℃で排出された排ガスGは、必要により温度調整(後記にて詳述)された後、輻射型の熱交換器2に導入され、回転炉床炉1で使用するバーナ燃焼用の空気Aと熱交換される。
熱交換器2から排出された排ガスGは、耐火物ダクト3によって、排ガス冷却塔4に導入される。耐火物ダクト3の代わりに水冷ダクトを用いてもよい。
排ガス冷却塔4で200℃以下、好ましくは180℃以下に冷却された排ガスGは、集塵機5として例えばバグフィルタで徐塵された後、誘引ファン6にて煙突7から大気中へ排出される。
本発明の効果を確証するため、図1に示す設備構成からなる排ガス処理装置を用い、輻射型熱交換器2は、その内筒(普通鋼製、内径1.55m、長さ8.2m、伝熱面積40m2)の内面に厚さ50mmの炭化珪素系耐火物(SiC含有量60質量%、残部主としてAl2O3、SiO2)をキャスタにて内張りしたものとし、排ガス冷却塔4は、排ガス中に水スプレと常温の空気を導入できるものとした。
次に、上記実施例1と同様の設備構成にて、熱交換器2の内筒内面に施工する炭化珪素系耐火物として、そのSiC含有量を80質量%に増加させたものを用い、上記実施例1と同様の操業条件にて約190日間操業を継続した。
上記実施例1,2では、炭化珪素系耐火物の厚みは50mmとしたが、該耐火物厚みを100mmとすると、厚み50mmの場合を基準として熱交換量が約15%低下し、200mmとすると、厚み50mmの場合を基準として熱交換量が約27%低下すると試算され、高熱伝導性耐火物の厚みは、施工可能な範囲でできるだけ薄くするのが良いことがわかる。
上記実施例2では、熱交換器入口における排ガス温度の調整を、常温の空気を導入することで行ったが、熱交換器入口における温度調整後の排ガス組成は、容量%で、O2:3.6%、CO2:7.6%、H2O:14.6%であった。
比較例として、図8に示す設備構成、すなわち、回転炉床炉1、耐火物ダクト3、排ガス冷却塔4、熱交換器12、集塵機5、誘引ファン6、煙突7からなる排ガス処理装置を用いた。
2…輻射型熱交換器
21…外筒、22…内筒、23…高熱伝導性耐火物
3…耐火物ダクト
4…排ガス冷却塔
5…集塵機
6…吸引ファン
7…煙突
8…熱交換器入口ガス温度制御手段
A…空気
G…排ガス
Claims (9)
- 回転炉床式還元炉からの排ガスの処理流路の第1段階に、内筒の内部を前記排ガスが流通するとともに、前記内筒と外筒の間を空気が流通するように構成された輻射型熱交換器を設置した排ガス処理装置であって、前記内筒の内面に高熱伝導性耐火物を施工したことを特徴とする回転炉床式還元炉の排ガス処理装置。
- 前記高熱伝導性耐火物が、炭化珪素系耐火物である請求項1に記載の回転炉床式還元炉の排ガス処理装置。
- 前記炭化珪素系耐火物のSiC含有量が、60質量%以上である請求項1または2に記載の回転炉床式還元炉の排ガス処理装置。
- 前記熱交換器の入口における排ガスの温度を1100℃以上に制御する熱交換器入口ガス温度制御手段を備えた請求項1〜3のいずれか1項に記載の回転炉床式還元炉の排ガス処理装置。
- 前記熱交換器の入口における排ガスの温度を1200℃以上に制御する熱交換器入口ガス温度制御手段を備えた請求項1〜3のいずれか1項に記載の回転炉床式還元炉の排ガス処理装置。
- 前記熱交換器入口ガス温度制御手段が、前記回転炉床式還元炉からの排ガス中に空気を導入することにより行うものである請求項4または5に記載の回転炉床式還元炉の排ガス処理装置。
- 前記熱交換器入口ガス温度制御手段が、前記回転炉床式還元炉からの排ガス中に冷却後の燃焼排ガスを導入することにより行うものである請求項4または5に記載の回転炉床式還元炉の排ガス処理装置。
- 前記熱交換器の後段に、該熱交換器の出口から排出された排ガスを急冷する排ガス冷却塔を設けた請求項1〜7のいずれか1項に記載の回転炉床式還元炉の排ガス処理装置。
- 請求項8に記載の排ガス処理装置を用いた排ガス処理方法であって、前記熱交換器の出口における排ガス温度を600℃以上とし、前記排ガス冷却塔内における、排ガスの600℃から200℃までの冷却を5秒以内で行うことを特徴とする回転炉床式還元炉の排ガス処理方法。
Priority Applications (7)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2007181217A JP2009019786A (ja) | 2007-07-10 | 2007-07-10 | 回転炉床式還元炉の排ガス処理装置および方法 |
EP20080777468 EP2172726A4 (en) | 2007-07-10 | 2008-06-20 | DEVICE AND METHOD FOR TREATING EXHAUST GASES FOR A TURNING OVEN REDUCTION OVEN |
CN2008800235705A CN101688759B (zh) | 2007-07-10 | 2008-06-20 | 回转炉底式还原炉的排气处理装置以及方法 |
US12/668,440 US20100186644A1 (en) | 2007-07-10 | 2008-06-20 | Exhaust gas processing system and method for rotary hearth type reducing furnace |
KR20107000390A KR20100018055A (ko) | 2007-07-10 | 2008-06-20 | 회전 노상식 환원로의 배기가스 처리 장치 및 방법 |
AU2008273500A AU2008273500B2 (en) | 2007-07-10 | 2008-06-20 | Apparatus and method for treating waste gas for rotary hearth furnace-type reducing furnace |
PCT/JP2008/061324 WO2009008256A1 (ja) | 2007-07-10 | 2008-06-20 | 回転炉床式還元炉の排ガス処理装置および方法 |
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JP2007181217A JP2009019786A (ja) | 2007-07-10 | 2007-07-10 | 回転炉床式還元炉の排ガス処理装置および方法 |
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JP2007181217A Pending JP2009019786A (ja) | 2007-07-10 | 2007-07-10 | 回転炉床式還元炉の排ガス処理装置および方法 |
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US (1) | US20100186644A1 (ja) |
EP (1) | EP2172726A4 (ja) |
JP (1) | JP2009019786A (ja) |
KR (1) | KR20100018055A (ja) |
CN (1) | CN101688759B (ja) |
AU (1) | AU2008273500B2 (ja) |
WO (1) | WO2009008256A1 (ja) |
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JP2014084524A (ja) * | 2012-10-26 | 2014-05-12 | Kobe Steel Ltd | 製鉄プラントにおける熱回収システム |
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JP2014084524A (ja) * | 2012-10-26 | 2014-05-12 | Kobe Steel Ltd | 製鉄プラントにおける熱回収システム |
CN106766962A (zh) * | 2017-01-12 | 2017-05-31 | 中国科学院力学研究所 | 一种回转窑三次风管余热取热装置 |
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Also Published As
Publication number | Publication date |
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CN101688759B (zh) | 2013-05-08 |
US20100186644A1 (en) | 2010-07-29 |
AU2008273500A1 (en) | 2009-01-15 |
WO2009008256A1 (ja) | 2009-01-15 |
EP2172726A4 (en) | 2013-10-30 |
EP2172726A1 (en) | 2010-04-07 |
KR20100018055A (ko) | 2010-02-16 |
AU2008273500B2 (en) | 2011-09-29 |
CN101688759A (zh) | 2010-03-31 |
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