JPH01252713A - Apparatus for recovering sensible heat in exhaust gas in smelting reduction furnace - Google Patents
Apparatus for recovering sensible heat in exhaust gas in smelting reduction furnaceInfo
- Publication number
- JPH01252713A JPH01252713A JP63078478A JP7847888A JPH01252713A JP H01252713 A JPH01252713 A JP H01252713A JP 63078478 A JP63078478 A JP 63078478A JP 7847888 A JP7847888 A JP 7847888A JP H01252713 A JPH01252713 A JP H01252713A
- Authority
- JP
- Japan
- Prior art keywords
- exhaust gas
- furnace
- smelting reduction
- reduction furnace
- movable hood
- 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.)
- Pending
Links
- 238000003723 Smelting Methods 0.000 title claims abstract description 29
- 238000011084 recovery Methods 0.000 claims abstract description 11
- 239000000428 dust Substances 0.000 claims abstract description 5
- 238000002485 combustion reaction Methods 0.000 claims description 11
- 239000007789 gas Substances 0.000 abstract description 38
- 239000000446 fuel Substances 0.000 abstract description 13
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- 238000009792 diffusion process Methods 0.000 abstract description 2
- 238000010079 rubber tapping Methods 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 239000002184 metal Substances 0.000 abstract 2
- 239000000567 combustion gas Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 11
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 8
- 229910052760 oxygen Inorganic materials 0.000 description 8
- 239000001301 oxygen Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 239000006227 byproduct Substances 0.000 description 5
- 239000003575 carbonaceous material Substances 0.000 description 5
- 239000003245 coal Substances 0.000 description 5
- 230000008018 melting Effects 0.000 description 5
- 238000007664 blowing Methods 0.000 description 4
- 238000002844 melting Methods 0.000 description 4
- 238000010248 power generation Methods 0.000 description 4
- 229910052742 iron Inorganic materials 0.000 description 3
- ODINCKMPIJJUCX-UHFFFAOYSA-N Calcium oxide Chemical compound [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000571 coke Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000011946 reduction process Methods 0.000 description 2
- 229920006395 saturated elastomer Polymers 0.000 description 2
- 235000019738 Limestone Nutrition 0.000 description 1
- 235000012255 calcium oxide Nutrition 0.000 description 1
- 239000000292 calcium oxide Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000010309 melting process Methods 0.000 description 1
- 230000002747 voluntary effect Effects 0.000 description 1
- 239000002918 waste heat 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
- C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
-
- 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
- C21B2100/40—Gas purification of exhaust gases to be recirculated or used in other metallurgical processes
- C21B2100/44—Removing particles, e.g. by scrubbing, dedusting
-
- 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
- C21B2100/62—Energy conversion other than by heat exchange, e.g. by use of exhaust gas in energy production
-
- 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
- C21B2100/66—Heat exchange
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は溶融還元炉の排ガス顕熱回収装置に関するもの
である。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to an exhaust gas sensible heat recovery device for a smelting reduction furnace.
［従来の技術］
鉄鉱石の溶融還元法は一般に予備還元工程と溶融還元工
程とに分かれるのが通常である。溶融、還元プロセスに
あっては、還元と溶解に必要な多量のエネルギーを如何
にして供給するかが、プロセスの成否の鍵である。[Prior Art] Iron ore smelting reduction methods are generally divided into a preliminary reduction step and a smelting reduction step. In melting and reduction processes, the key to success or failure of the process is how to supply the large amount of energy necessary for reduction and melting.
例えば特開昭８１−６４８０７号公報は溶融還元プロセ
ス全体のエネルギー利用率の有効な溶融還元炉の操業方
法を提起ししている。そのフローを第２図に示す。For example, Japanese Unexamined Patent Publication No. 81-64807 proposes a method of operating a smelting-reduction furnace that is effective in improving the energy utilization rate of the entire smelting-reduction process. The flow is shown in Figure 2.
即ち図において、鉄鉱石および石灰石は、鉱石予熱炉１
において、石炭と空気との燃焼反応熱によって加熱され
、流動層反応炉２に供給される。That is, in the figure, iron ore and limestone are
In this step, the coal is heated by the heat of combustion reaction between the coal and air, and is supplied to the fluidized bed reactor 2.
流動層反応炉２において、流動状態の予熱鉱石および生
石灰に、石炭および酸素或は酸素含有ガスが吹込まれる
。In the fluidized bed reactor 2, coal and oxygen or oxygen-containing gas are blown into the preheated ore and quicklime in a fluidized state.
吹込まれた石炭は、予熱鉱石との熱交換、および酸素と
の反応による部分燃焼により熱分解し、還元性のガスを
発生するとともに、チャーとなる。The injected coal is thermally decomposed through heat exchange with the preheated ore and partial combustion due to reaction with oxygen, generating reducing gas and turning into char.
溶融還元炉４では、上吹きランス５から酸素が浴に向っ
て吹きつけられるとともに、底吹羽口６から浴中に酸素
および石炭等の炭材が吹込まれる。In the melting reduction furnace 4, oxygen is blown toward the bath from the top blowing lance 5, and oxygen and carbonaceous material such as coal are blown into the bath from the bottom blowing tuyere 6.
そして、供給されるブリケット１７に含まれる炭材、底
吹羽口６からの酸素とともに吹込まれる炭材、或は装入
装置７から供給されるコークスなどの炭材と、上吹きラ
ンス５から供給される酸素との反応によって多量の熱を
発生する。Then, the carbon material contained in the supplied briquettes 17, the carbon material blown in with oxygen from the bottom blowing tuyere 6, or the carbon material such as coke supplied from the charging device 7, and the carbon material such as coke from the top blowing lance 5. Generates a large amount of heat by reaction with supplied oxygen.
この多量の熱によってブリケット１７中の半還元鉱石は
溶解し、還元が進行し溶鉄１９となる。２３は還元性ガ
スを示す。The semi-reduced ore in the briquettes 17 is melted by this large amount of heat, and the reduction progresses to become molten iron 19. 23 represents a reducing gas.
この例では溶融還元炉４で発生したガス或はこのガスを
脱炭酸ガス処理して得られる還元ガス２３が、流動層反
応炉２からの燃料ガス２４との熱交換によって７００〜
９００℃に昇温せしめられた後吹込まれる。In this example, the gas generated in the smelting reduction furnace 4 or the reducing gas 23 obtained by decarbonizing this gas is heated to 700 to 700 ml by heat exchange with the fuel gas 24 from the fluidized bed reactor 2.
It is heated to 900°C and then blown into it.
ところで継続して発生する高温ガスからの蒸気回収にお
いては、蒸気発生もまた継続するので、通常はアキュム
レータによる平滑化を行なう。そのため、利用される時
点では低圧の飽和蒸気となり、発電用蒸気としては利用
できない。By the way, when steam is recovered from continuously generated high-temperature gas, since steam generation also continues, smoothing is normally performed using an accumulator. Therefore, when it is used, it becomes low-pressure saturated steam and cannot be used as steam for power generation.
［発明が解決しようとする課題〕
溶融還元製鉄プロセスにおいては、酸素製造成は吸引ブ
ロワ−や昇圧コンプレッサーに電力を使用する。この電
力を、溶融還元製鉄プロセス系内から発生する副生エネ
ルギーを利用して製造することは、溶融還元製鉄法の経
済性にとって！ｆＬ要である。[Problems to be Solved by the Invention] In the smelting reduction ironmaking process, electric power is used for the suction blower and booster compressor for oxygen production. Producing this electricity by using the by-product energy generated from the smelting reduction ironmaking process system is a great way to improve the economy of the smelting reduction ironmaking process! fL is essential.
そのためには、溶融還元炉から発生する高温排ガスの顕
熱から、発電用に高圧蒸気を連続的に回収することが有
利である。To this end, it is advantageous to continuously recover high-pressure steam for power generation from the sensible heat of the high-temperature exhaust gas generated from the smelting reduction furnace.
しかしながら、溶融還元炉から発生する排ガスの温度・
量が継続するために、利用する時点で低圧の飽和蒸気し
か得られないと、発電用蒸気としては利用できない。However, the temperature of the exhaust gas generated from the smelting reduction furnace
Because the amount is continuous, if only low-pressure saturated steam is available at the time of use, it cannot be used for power generation.
本発明は連続的に高圧蒸気を回収する溶融還元炉の排ガ
ス顕熱回収装置を提供するものである。The present invention provides an exhaust gas sensible heat recovery device for a smelting-reduction furnace that continuously recovers high-pressure steam.
［課題を解決するための手段コ
本発明は溶融還元炉の炉口に可動フードを設けた炉頂ダ
クトを配設し、該炉頂ダクトに排ガス顕然回収用パイプ
を内設して排ガス移送ダクトに連結し、前記可動フード
内にバーナを有する燃焼装置を設け、集塵装置を介して
排ガス回収系に導通したことを特徴とする溶融還元炉の
排ガス顕熱回収装置である。[Means for Solving the Problems] The present invention provides a furnace top duct equipped with a movable hood at the furnace mouth of a smelting reduction furnace, and a pipe for overt collection of exhaust gas is installed inside the furnace top duct to transfer the exhaust gas. This exhaust gas sensible heat recovery device for a smelting-reduction furnace is characterized in that a combustion device connected to a duct and having a burner in the movable hood is connected to an exhaust gas recovery system via a dust collector.
即ち本発明においては、炉口の６Ｊ動フード内にバーナ
を有する燃焼装置を設け、溶融還元炉の操業において、
溶融還元炉から発生する排ガスの温度・量の継続時に、
排ガス煙道にて補助燃料を燃焼させて、その排ガス顕熱
から連続的に高圧蒸気を回収する。補助燃料には、溶融
還元製鉄プロセスから発生する副生ガスを用いる。That is, in the present invention, a combustion device having a burner is provided in a 6J dynamic hood at the furnace mouth, and in the operation of the smelting reduction furnace,
When the temperature and amount of exhaust gas generated from the smelting reduction furnace continues,
Auxiliary fuel is burned in the exhaust gas flue, and high-pressure steam is continuously recovered from the sensible heat of the exhaust gas. By-product gas generated from the smelting reduction ironmaking process is used as the auxiliary fuel.
以下本発明を第１図について説明する。The invention will now be described with reference to FIG.
図において、溶融還元炉の炉口に炉頂ダクト３０、移送
ダクト３１を設ける。炉頂ダクト３０は可動フード４０
を有し、可動フード４０は上下動自在である。In the figure, a furnace top duct 30 and a transfer duct 31 are provided at the furnace mouth of the melting reduction furnace. The furnace top duct 30 is a movable hood 40
The movable hood 40 is vertically movable.
可動フード内周に円周方向に指向したバーナを複数本設
けて燃焼装置を形成している４０．４１は補助燃料管で
ある。Reference numerals 40 and 41 are auxiliary fuel pipes that form a combustion device by providing a plurality of burners oriented in the circumferential direction on the inner periphery of the movable hood.
炉頂ダクトは内周に例えばボイラー管４２−１゜４２−
２を張設して高温高圧蒸気をタービン（図示せず）に導
入する。３２は集塵装置でサイクロン３３、バグフィル
タ−３４からなる、移送ダクトにダンパー３９を設ける
。３５は吸引ファン、３６はガス回収系、３７はガス放
散系であり、ダンパー調整器３８に導通する。For example, the furnace top duct has boiler tubes 42-1゜42-
2 to introduce high-temperature, high-pressure steam into a turbine (not shown). Reference numeral 32 denotes a dust collector, which includes a cyclone 33 and a bag filter 34, and a damper 39 is provided in the transfer duct. 35 is a suction fan, 36 is a gas recovery system, and 37 is a gas diffusion system, which is electrically connected to a damper regulator 38.
即ち本発明においては溶融還元炉の排滓、出鋼時もしく
は炉内張り耐火材の捕集時には炉口に燃焼空気、補助燃
料を供給して、ダンパー制御して、所望の空燃比をもっ
て補助燃料燃焼による高温高圧蒸気を得る。燃焼排ガス
は人気に放散する。That is, in the present invention, combustion air and auxiliary fuel are supplied to the furnace mouth at the time of exhausting the smelting reduction furnace, tapping steel, or collecting the refractory lining of the furnace, and controlling the damper to burn the auxiliary fuel at a desired air-fuel ratio. to obtain high-temperature, high-pressure steam. Combustion exhaust gas is popularly dissipated.
従って溶融還元炉の操業において、溶融還元炉から発生
する排ガスの温度・量が継続しても、排ガス煙道にて補
助燃料を燃焼させて、その排ガス顕熱から連続的に高圧
蒸気を回収する。補助燃料には、溶融還元製鉄プロセス
から発生する副生ガスを用いる。Therefore, in the operation of a smelting reduction furnace, even if the temperature and amount of exhaust gas generated from the smelting reduction furnace continues, auxiliary fuel is burned in the exhaust gas flue and high-pressure steam is continuously recovered from the sensible heat of the exhaust gas. . By-product gas generated from the smelting reduction ironmaking process is used as the auxiliary fuel.
補助燃料用の副生ガスとしては、溶融還元製鉄プロセス
から定常的に発生するガスかそれをホルダーに貯めたガ
スを使用してもよいし、並行して操業される溶融還元炉
の二次燃焼率を低下させることによって得られる余分の
溶融還元炉ガスを用いてもよい。As the by-product gas for auxiliary fuel, gas regularly generated from the smelting reduction ironmaking process or gas stored in a holder may be used, or the secondary combustion of the smelting reduction furnace operated in parallel may be used. The excess smelter gas obtained by reducing the rate may be used.
［発明の効果］
本発明は溶融還元炉が稼働していないときを選択して可
動フードから燃焼空気を吸引するとともにプロセス系内
に発生した副生ガスを補助燃料としてタービン稼働用の
高圧蒸気をうるので、溶融還元炉の操業において、溶融
還元炉から発生する排ガス温度・量の継続にかかわらず
、排ガス煙道に設けた排熱回収ボイラーから連続的に高
圧蒸気を回収し、発電プロセスに有効利用できる効果が
ある。[Effects of the Invention] The present invention selects a time when the smelting reduction furnace is not in operation, sucks combustion air from a movable hood, and uses by-product gas generated in the process system as auxiliary fuel to generate high-pressure steam for turbine operation. Therefore, during the operation of the smelting reduction furnace, high-pressure steam is continuously recovered from the waste heat recovery boiler installed in the exhaust gas flue, regardless of the continuation of the temperature and amount of exhaust gas generated from the smelting reduction furnace, which is effective for the power generation process. There are effects that can be used.
第１図は本発明の全体説明図、第２図は従来例の説明図
である。
４：溶融還元炉 ３吐炉項ダクト３２二集塵装
置 ３９：ダンパー４０：可動フード
代 理 人 弁理士 茶野木 立 夫手続補正書（
自発）
昭和６３年６月３日FIG. 1 is an overall explanatory diagram of the present invention, and FIG. 2 is an explanatory diagram of a conventional example. 4: Melting reduction furnace 3 Discharge furnace duct 32 2 Dust collector 39: Damper 40: Movable hood Agent Patent attorney Tatsuo Chanoki Procedural amendment (
(Voluntary) June 3, 1986
Claims (1)
設し、該炉頂ダクトに排ガス顕熱回収用パイプを内設し
て排ガス移送ダクトに連結し、前記可動フード内にバー
ナを有する燃焼装置を設け、集塵装置を介して排ガス回
収系に導通したことを特徴とする溶融還元炉の排ガス顕
熱回収装置。A furnace top duct with a movable hood is installed at the furnace mouth of the smelting reduction furnace, a pipe for exhaust gas sensible heat recovery is installed inside the furnace top duct and connected to the exhaust gas transfer duct, and a burner is installed in the movable hood. 1. An exhaust gas sensible heat recovery device for a smelting-reduction furnace, characterized in that the exhaust gas recovery system is provided with a combustion device having a combustion device, and is connected to an exhaust gas recovery system via a dust collector.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63078478A JPH01252713A (en) | 1988-03-31 | 1988-03-31 | Apparatus for recovering sensible heat in exhaust gas in smelting reduction furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63078478A JPH01252713A (en) | 1988-03-31 | 1988-03-31 | Apparatus for recovering sensible heat in exhaust gas in smelting reduction furnace |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01252713A true JPH01252713A (en) | 1989-10-09 |
Family
ID=13663114
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63078478A Pending JPH01252713A (en) | 1988-03-31 | 1988-03-31 | Apparatus for recovering sensible heat in exhaust gas in smelting reduction furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01252713A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007146197A (en) * | 2005-11-24 | 2007-06-14 | Nippon Steel Corp | Apparatus for recovering waste gas and control method therefor |
-
1988
- 1988-03-31 JP JP63078478A patent/JPH01252713A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007146197A (en) * | 2005-11-24 | 2007-06-14 | Nippon Steel Corp | Apparatus for recovering waste gas and control method therefor |
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