JPH0216365B2 - - Google Patents
Info
- Publication number
- JPH0216365B2 JPH0216365B2 JP59225049A JP22504984A JPH0216365B2 JP H0216365 B2 JPH0216365 B2 JP H0216365B2 JP 59225049 A JP59225049 A JP 59225049A JP 22504984 A JP22504984 A JP 22504984A JP H0216365 B2 JPH0216365 B2 JP H0216365B2
- Authority
- JP
- Japan
- Prior art keywords
- reduction furnace
- smelting reduction
- iron ore
- exhaust gas
- smelting
- 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
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 36
- 238000003723 Smelting Methods 0.000 claims description 31
- 239000007789 gas Substances 0.000 claims description 30
- 229910052742 iron Inorganic materials 0.000 claims description 18
- 238000002844 melting Methods 0.000 claims description 17
- 230000008018 melting Effects 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 238000011084 recovery Methods 0.000 claims description 11
- 239000002918 waste heat Substances 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 7
- 229910052751 metal Inorganic materials 0.000 claims description 7
- 239000000155 melt Substances 0.000 claims description 6
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000003570 air Substances 0.000 claims description 2
- 239000003575 carbonaceous material Substances 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims description 2
- 230000000717 retained effect Effects 0.000 claims description 2
- 238000010079 rubber tapping Methods 0.000 description 12
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 239000002994 raw material Substances 0.000 description 4
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000006114 decarboxylation reaction Methods 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 239000003245 coal Substances 0.000 description 2
- 239000000567 combustion gas Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/14—Multi-stage processes processes carried out in different vessels or furnaces
- C21B13/143—Injection of partially reduced ore into a molten bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B13/00—Making spongy iron or liquid steel, by direct processes
- C21B13/02—Making spongy iron or liquid steel, by direct processes in shaft furnaces
- C21B13/029—Introducing coolant gas in the shaft furnaces
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/20—Increasing the gas reduction potential of recycled exhaust gases
- C21B2100/28—Increasing the gas reduction potential of recycled exhaust gases by separation
- C21B2100/282—Increasing the gas reduction potential of recycled exhaust gases by separation of carbon dioxide
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B2100/00—Handling of exhaust gases produced during the manufacture of iron or steel
- C21B2100/60—Process control or energy utilisation in the manufacture of iron or steel
-
- 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
- Y02P10/122—Reduction of greenhouse gas [GHG] emissions by capturing or storing CO2
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は鉄鉱石の溶融還元方法に関し、さらに
詳しくは、溶融還元炉から溶湯の出湯中であつて
も、溶融還元炉上部に設けられている廃熱回収ボ
イラーを連続的に運転することができ、さらに、
予備還元炉も溶融還元炉の出湯中であつても連続
操業ができる鉄鉱石の溶融還元方法に関するもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a method for melting and reducing iron ore, and more specifically, the present invention relates to a method for melting and reducing iron ore. The waste heat recovery boiler can be operated continuously, and
The preliminary reduction furnace also relates to a method for smelting and reducing iron ore that can be operated continuously even while the molten metal is being tapped from the smelting reduction furnace.
［従来技術］
従来においては、溶融還元炉から出湯する場合
には炉を傾動させることにより行なうのが通例で
あつた。しかし、このように溶融還元炉を傾けて
出湯することにより、炉からの高温の排ガスが連
続的には得ることができず、不経済となつてい
る。そして、連続的に溶融還元炉から高温の排ガ
スを得ようとすると、出湯が困難となり、また、
上記した各原料や酸素等の装入を停止しなければ
ならなくなり、この時、溶融還元炉に設置されて
いる廃熱回収ボイラーの運転を休止しなければな
らなくなる。[Prior Art] Conventionally, when tapping from a smelting reduction furnace, it was customary to tilt the furnace. However, tapping the melt by tilting the melting reduction furnace in this way makes it impossible to continuously obtain high-temperature exhaust gas from the furnace, making it uneconomical. If you try to continuously obtain high-temperature exhaust gas from the smelting reduction furnace, it will be difficult to tap the hot water, and
It becomes necessary to stop the charging of each of the above-mentioned raw materials, oxygen, etc., and at this time, the operation of the waste heat recovery boiler installed in the melting reduction furnace must be stopped.
［発明が解決しようとする問題点］
本発明は上記に説明したように、従来における
溶融還元炉の廃熱回収ボイラーの運転を休止する
ことなく、予備還元炉の高温排ガスを燃焼させて
有効に廃熱ボイラーに供給し、さらに、予備還元
炉も溶融還元炉操業中の高温排ガスをガスホルダ
ーに留めておいて、溶融還元炉から溶湯の出湯中
においても操業することができる鉄鉱石の溶融還
元方法を提供するものである。[Problems to be Solved by the Invention] As explained above, the present invention effectively burns the high-temperature exhaust gas of the preliminary reduction furnace without stopping the operation of the waste heat recovery boiler of the conventional smelting reduction furnace. This is an iron ore smelting reduction method that supplies waste heat to the boiler and also stores the high-temperature exhaust gas during the operation of the smelting reduction furnace in the gas holder, allowing operation even when molten metal is being tapped from the smelting reduction furnace. The present invention provides a method.
［問題点を解決するための手段］
本発明に係る鉄鉱石の溶融還元方法の特徴とす
るところは、溶融還元炉の底部から鉄鉱石、炭素
質材料、造滓剤および酸素または空気を装入して
鉄鉱石を溶融還元するに際し、溶融還元炉から出
湯中は溶融還元炉の上部において予備還元炉の排
ガスを燃焼させて、溶融還元炉出口に設けられて
いる廃熱回収ボイラーの連続運転を行ない、一
方、予備還元炉は溶融還元炉操業中においてガス
ホルダーに留められている溶融還元炉の排ガスに
より溶融還元炉の出湯中でも連続的に操業する点
に存する。[Means for Solving the Problems] The iron ore smelting reduction method according to the present invention is characterized by charging iron ore, carbonaceous material, slag forming agent, and oxygen or air from the bottom of the smelting reduction furnace. When iron ore is smelted and reduced, the exhaust gas from the preliminary reduction furnace is burned in the upper part of the smelting reduction furnace while the metal is being discharged from the smelting reduction furnace, and the waste heat recovery boiler installed at the exit of the smelting reduction furnace is continuously operated. On the other hand, the preliminary reduction furnace operates continuously even when the melt is being tapped from the melt reduction furnace using the exhaust gas from the melt reduction furnace which is retained in the gas holder during the operation of the melt reduction furnace.
本発明に係る鉄鉱石の溶融還元方法について第
１図および第２図により詳細に説明する。 The method for melting and reducing iron ore according to the present invention will be explained in detail with reference to FIGS. 1 and 2.
第２図に示すように、溶融還元炉２内にその底
部に設けられいる羽口１２から予備還元炉で還元
された鉄鉱石、石炭、生石灰を、また、羽口１１
からは酸素ガスを装入して予備還元されている鉄
鉱石を溶融還元して出湯するのであるが、この場
合、溶融還元炉２を傾動することなく、そのまま
の状態において、スライドゲート１０を開けて溶
融還元炉内の溶湯を出湯樋１５を経て傾注樋１６
により湯銑車１８とスラグパン台車１７とに分配
する。 As shown in FIG. 2, iron ore, coal, and quicklime reduced in the preliminary reduction furnace are transferred from the tuyere 12 provided at the bottom of the smelting reduction furnace 2 to the tuyere 11.
From here on, the iron ore which has been pre-reduced by charging oxygen gas is smelted and reduced and tapped. The molten metal in the melting reduction furnace is passed through the tapping gutter 15 to the tilting gutter 16.
The hot water is distributed to the hot water car 18 and the slag pan truck 17.
この出湯中においては、溶融還元炉２からは高
温ガスの発生がないので、代りに、予備還元炉１
の排ガスを入口９より溶融還元炉２の上部に供給
して燃焼させて、高温燃焼ガスをフード１４から
溶融還元炉２の出口に設置されている廃熱回収ボ
イラー５に送られ連続運転される。この廃熱回収
ボイラー５を連続運転することは、該ボイラー５
の熱損失を低減することを目的とする。 During this tapping, there is no high-temperature gas generated from the melting reduction furnace 2, so instead, the preliminary reduction furnace 1
The exhaust gas is supplied from the inlet 9 to the upper part of the smelting reduction furnace 2 and combusted, and the high-temperature combustion gas is sent from the hood 14 to the waste heat recovery boiler 5 installed at the outlet of the smelting reduction furnace 2 for continuous operation. . Continuously operating this waste heat recovery boiler 5 means that the boiler 5
The purpose is to reduce heat loss.
なお、溶融還元炉２の出湯中においては、炉底
の酸素羽口１１には不活性ガス（N2または
CO2、）原料１２には脱炭酸装置の出口ガスを少
量ずつ吹込んで各羽口１１，１２の保護を行な
う。 Note that during tapping from the smelting reduction furnace 2, an inert gas (N 2 or
The outlet gas of the decarboxylation device is blown into the raw material 12 little by little to protect each tuyere 11 and 12.
しかして、予備還元炉１は溶融還元炉２が出湯
中で溶融還元を中止していても常時操業しなけれ
ば生産性が悪化するから、溶融還元炉２の操業中
に発生する排ガスをガスホルダー７に充分留めて
おいて、溶融還元炉２の出湯中には、このガスホ
ルダー７からの排ガスを適宜の手段により脱炭酸
装置６に送つてCO2を除去した排ガスを、予備還
元炉１からの排ガスを自燃式昇温機３により高温
としてガス−ガス熱交換器４で、昇温して予備還
元炉２に供給して流動床方式により鉄鉱石を予備
還元するのである。 However, even if the smelting reduction furnace 2 is in the process of tapping and stopping smelting reduction, the productivity will deteriorate if it is not operated constantly, so the exhaust gas generated during the operation of the smelting reduction furnace 2 is transferred to the gas holder. 7, and during tapping from the smelting reduction furnace 2, the exhaust gas from the gas holder 7 is sent to the decarboxylation device 6 by appropriate means to remove CO 2 , and the exhaust gas is sent from the preliminary reduction furnace 1. The exhaust gas is heated to a high temperature by a self-combustion heating device 3, heated by a gas-gas heat exchanger 4, and then supplied to a pre-reduction furnace 2, where the iron ore is pre-reduced by a fluidized bed method.
このように、溶融還元炉２において出湯中であ
つても、廃熱回収ボイラー５は連続運転すること
ができ、さらに、予備還元炉１も充分に操業する
ことができるのである。 In this way, the waste heat recovery boiler 5 can be operated continuously even when the melting reduction furnace 2 is tapping hot water, and furthermore, the preliminary reduction furnace 1 can also be operated satisfactorily.
［実施例］
本発明に係る鉄鉱石の溶融還元方法の実施例を
説明する。[Example] An example of the method for melting and reducing iron ore according to the present invention will be described.
実施例
溶融還元炉の底部の羽口から、予備還元鉱
72Ton／Hr、石炭37Ton／Hr、ライム5.7Ton／
Hr、O224800Nm3／Hr、キヤリヤーガス5.290N
m3／Hrを装入して溶融還元を50分間連続運転し、
10分間原料装入を中止して出湯するが、この10分
間のうち３分間は静置し、７分間で溶融還元炉の
スライドゲートを開いて出湯する。溶湯は出湯樋
から傾注樋を通つてスラグと溶鉄湯に分離され
る。Example Pre-reduced ore is extracted from the tuyere at the bottom of the smelting reduction furnace.
72Ton/Hr, Coal 37Ton/Hr, Lime 5.7Ton/Hr
Hr, O 2 24800Nm 3 /Hr, carrier gas 5.290N
m 3 /Hr was charged and melting reduction was operated continuously for 50 minutes.
The raw material charging is stopped for 10 minutes and the hot water is tapped out. Of these 10 minutes, the furnace is allowed to stand still for 3 minutes, and after 7 minutes the slide gate of the smelting reduction furnace is opened to tap the hot water. The molten metal is separated into slag and molten metal from the tapping gutter through the tilting gutter.
この溶融還元炉の出湯中の10分間は、溶融還元
炉の上部において予備還元炉の排ガスを燃焼さ
せ、約1700℃の温度の燃焼ガスを廃熱回収ボイラ
ーに送つて連続的に運転を行ない、10分経過後、
溶融還元炉に原料を装入して操業開始し、溶融還
元炉から溶融還元による高温ガスの発生があるよ
うになると予備還元炉の排ガスの燃焼を中止する
のである。 During the 10 minutes while the melting reduction furnace is tapping, the exhaust gas from the preliminary reduction furnace is combusted in the upper part of the melting reduction furnace, and the combustion gas at a temperature of approximately 1,700°C is sent to the waste heat recovery boiler for continuous operation. After 10 minutes,
Raw materials are charged into the smelting reduction furnace and operation is started, and when the smelting reduction furnace begins to generate high-temperature gas due to smelting reduction, combustion of the exhaust gas in the preliminary reduction furnace is stopped.
また、溶融還元炉の出湯中といえども予備還元
炉の操業を止めることはできないので、この場合
は、溶融還元炉の50分の連続操業中にガスホルダ
ーに排ガスＣ（圧力1.1ata、71100Nm3／Hr、
H2：12Vol％、CO：57Vol％、CO2：16Vol％、
H2O：15Vol％、N2：1Vol％）が常温で貯留さ
れており、この排ガスＣを脱炭酸装置Ｃにより
CO2を除去してからガス−ガス熱交換器４におい
て、予備還元炉１より鉄鉱石を還元した約840℃
の排ガスＡ（圧力3.5ata、57330Nm3／Hr、H2：
10Vol％、CO：55Vol％、CO2：27Vol％、
H2O：6Vol％、N2：2Vol％）を自燃式昇温機３
により理論的量の酸素により燃焼させて約1000℃
の排ガスＢ（圧力3.5ata、H2：17Vol％、CO：
30Vol％、CO2：45Vol％、H2O：7Vol％、N2：
1Vol％、ダスト：10ｇ／Ｎm3）と熱交換を行な
つて、約900℃の排ガスＤ（圧力：4.0ata、
57330Nm3／Hr、H2：15Vol％、CO：81Vol％、
CO2：0.6Vol％、H2O：0.8Vol％、N2：2Vnl％）
が予備還元炉に供給されて鉄鉱石を予備還元する
のであり、予備還元率は70％であつた。 In addition, since the operation of the preliminary reduction furnace cannot be stopped even while the melting reduction furnace is in the process of tapping, in this case, the exhaust gas C (pressure 1.1ata, 71100Nm 3 /Hr,
H2 : 12Vol%, CO: 57Vol%, CO2 : 16Vol%,
H 2 O: 15Vol%, N 2 : 1Vol%) is stored at room temperature, and this exhaust gas C is removed by decarboxylation device C.
After CO 2 is removed, the iron ore is reduced from the preliminary reduction furnace 1 in the gas-gas heat exchanger 4 to approximately 840°C.
Exhaust gas A (pressure 3.5ata, 57330Nm3 /Hr, H2 :
10Vol%, CO: 55Vol%, CO2 : 27Vol%,
H 2 O: 6Vol%, N 2 : 2Vol%) using self-combustion heating machine 3
Burned with a theoretical amount of oxygen to about 1000℃
Exhaust gas B (pressure 3.5ata, H2 : 17Vol%, CO:
30Vol%, CO2 : 45Vol%, H2O : 7Vol%, N2 :
1Vol%, dust: 10g/Nm 3 ) and exhaust gas D at approximately 900°C (pressure: 4.0ata,
57330Nm3 /Hr, H2 : 15Vol%, CO: 81Vol%,
CO2 : 0.6Vol%, H2O : 0.8Vol%, N2 : 2Vnl%)
was supplied to the pre-reduction furnace to pre-reduce the iron ore, and the pre-reduction rate was 70%.
［発明の効果］
以上説明したように、本発明に係る鉄鉱石の溶
融還元方法は上記の構成を有しているものである
から、溶融還元炉から出湯中であつても廃熱回収
ボイラーは連続的に運転することができ、また、
流動床式予備還元炉も出湯中であつても予備還元
操業が行なうことができ、極めて効果的に熱回収
が行なうことができるという優れた効果を有する
ものである。[Effects of the Invention] As explained above, since the method for melting and reducing iron ore according to the present invention has the above-described configuration, the waste heat recovery boiler can be used even when hot water is being discharged from the melting and reducing furnace. Can be operated continuously and also
The fluidized bed pre-reduction furnace also has the excellent effect of being able to carry out the pre-reduction operation even during tapping and very effective heat recovery.
第１図および第２図は本発明に係る溶融還元方
法の概略説明図である。
FIG. 1 and FIG. 2 are schematic illustrations of the melting reduction method according to the present invention.
Claims (1)
造滓剤および酸素または空気を装入して、鉄鉱石
を溶融還元するに際し、溶融還元炉から出湯中は
溶融還元炉の上部において予備還元炉の排ガスを
燃焼させて、溶融還元炉出口に設けられている廃
熱回収ボイラーの連続運転を行ない、一方、予備
還元炉は溶融還元炉操業中においてガスホルダー
に留められている溶融還元炉の排ガスにより溶融
還元炉の出湯中でも連続的に操業することを特徴
とする鉄鉱石の溶融還元方法。1 Iron ore, carbonaceous materials,
When iron ore is smelted and reduced by charging a slag-forming agent and oxygen or air, the exhaust gas from the preliminary reduction furnace is burned in the upper part of the smelting reduction furnace while the metal is being discharged from the smelting reduction furnace. The waste heat recovery boiler is operated continuously, while the preliminary reduction furnace is operated continuously even when the melt is discharged from the smelting reduction furnace by the exhaust gas from the smelting reduction furnace which is retained in the gas holder during the operation of the smelting reduction furnace. A method for melting and reducing iron ore.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59225049A JPS61104012A (en) | 1984-10-25 | 1984-10-25 | Melt reduction method of iron ore |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59225049A JPS61104012A (en) | 1984-10-25 | 1984-10-25 | Melt reduction method of iron ore |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61104012A JPS61104012A (en) | 1986-05-22 |
| JPH0216365B2 true JPH0216365B2 (en) | 1990-04-17 |
Family
ID=16823234
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59225049A Granted JPS61104012A (en) | 1984-10-25 | 1984-10-25 | Melt reduction method of iron ore |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61104012A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0689383B2 (en) * | 1986-02-06 | 1994-11-09 | 新日本製鐵株式会社 | Equipment for manufacturing molten iron alloys |
-
1984
- 1984-10-25 JP JP59225049A patent/JPS61104012A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61104012A (en) | 1986-05-22 |
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