JPS6014807B2 - Temperature control method for floating steelmaking process - Google Patents
Temperature control method for floating steelmaking processInfo
- Publication number
- JPS6014807B2 JPS6014807B2 JP13752478A JP13752478A JPS6014807B2 JP S6014807 B2 JPS6014807 B2 JP S6014807B2 JP 13752478 A JP13752478 A JP 13752478A JP 13752478 A JP13752478 A JP 13752478A JP S6014807 B2 JPS6014807 B2 JP S6014807B2
- Authority
- JP
- Japan
- Prior art keywords
- floating
- floating layer
- furnace
- temperature
- temperature control
- 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
Links
- 238000000034 method Methods 0.000 title claims description 20
- 238000009628 steelmaking Methods 0.000 title claims description 6
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 30
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 18
- 229910052742 iron Inorganic materials 0.000 claims description 12
- 239000002994 raw material Substances 0.000 claims description 11
- 239000003575 carbonaceous material Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 8
- 229910052799 carbon Inorganic materials 0.000 description 8
- 238000006722 reduction reaction Methods 0.000 description 8
- 230000008569 process Effects 0.000 description 7
- 230000009467 reduction Effects 0.000 description 6
- 239000002245 particle Substances 0.000 description 5
- 238000010438 heat treatment Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 229910002091 carbon monoxide Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 241000219112 Cucumis Species 0.000 description 1
- 235000015510 Cucumis melo subsp melo Nutrition 0.000 description 1
- FJJCIZWZNKZHII-UHFFFAOYSA-N [4,6-bis(cyanoamino)-1,3,5-triazin-2-yl]cyanamide Chemical compound N#CNC1=NC(NC#N)=NC(NC#N)=N1 FJJCIZWZNKZHII-UHFFFAOYSA-N 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 239000000571 coke Substances 0.000 description 1
- 238000004939 coking Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 238000005243 fluidization Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000008188 pellet Substances 0.000 description 1
- 235000021395 porridge Nutrition 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Manufacture Of Iron (AREA)
Description
【発明の詳細な説明】
本発明は浮遊式製鉄プロセスの温度制御方法、詳しくは
浮遊式直接還元製鉄プロセスにおける温度制御方法に関
するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a temperature control method in a floating iron making process, and more particularly to a temperature control method in a floating direct reduction iron making process.
直接製鉄方法にはロータリーキルン法、シャフト炉法及
び流動層法等が知られているが、本発明は流動層法に分
類されるものである。The rotary kiln method, the shaft furnace method, the fluidized bed method, etc. are known as direct iron manufacturing methods, and the present invention is classified into the fluidized bed method.
従来の流動層法では、反応速度が大きい、層内温度が均
一、溢度制御が容易等の利点がある反面、熱利用効率が
悪い、粉体（原料）が凝集、付着して操業が困難となる
、等の問題点がある。Conventional fluidized bed methods have advantages such as high reaction rate, uniform temperature in the bed, and easy overflow control, but on the other hand, they have poor heat utilization efficiency and are difficult to operate due to agglomeration and adhesion of powder (raw materials). There are problems such as.
最近、これらの問題点を解決する一方法として浮遊式直
接還元製鉄プロセス（浮遊式直接製鉄プロセス）が提案
されている（特願昭５１−１５７７２６号、等）。この
浮遊式直接製鉄プロセスは、炭素質（石炭、コークス、
チャー等）を高温（８００〜１０００℃）に維持された
炉内に（気体により）浮遊流動させ、炭素質の浮遊式流
動層（浮遊層）を形成し、この層中に酸化鉄原料（鉄鉱
石粉等）を落下させ、層中を通過する間に還元するプロ
セスである。Recently, a floating direct reduction iron making process (floating direct iron making process) has been proposed as a method for solving these problems (Japanese Patent Application No. 157726/1983, etc.). This floating direct steelmaking process uses carbonaceous (coal, coke,
Char, etc.) is suspended (by gas) in a furnace maintained at a high temperature (800-1000℃) to form a carbonaceous floating fluidized bed (floating layer), and iron oxide raw material (iron ore) is suspended in this layer. This is a process in which stone powder, etc.) is dropped and reduced while passing through the layer.
このプロセスの場合、必然的に炉内の流動化流速は、ｏ
炭素質の浮遊
ｏ酸化鉄原料の落下
という２つの条件から決ってくる。For this process, necessarily the fluidization flow rate in the furnace is o
It is determined by two conditions: floating carbonaceous material and falling iron oxide raw material.
従って、これらの条件を満足する流量では炉内浮遊層の
温度を高温に保持するだけの熱量をまかなうことができ
ず、しかも物質収支上必要とされる量としても不足して
くる。Therefore, the flow rate that satisfies these conditions cannot cover the amount of heat sufficient to maintain the temperature of the floating layer in the furnace at a high temperature, and furthermore, the amount required in terms of material balance is insufficient.
そこで、これら２点、つまり
ｏ熱量
ｏ物質収支
をカバーするために、前記炭素質の浮遊層に通電するこ
とにより炭素費を発熱媒体として炉内温度の上昇、更に
、Ｆｅ２０３十父＝がｅ十３ＣＯ
又は
Ｆｅ２０３十３′２Ｃ＝がｅ＋３′２Ｃ０２の直接還元
反応を積極的に促進させ、これによって炉の生産性を著
しく増加させるプロセスが提案されている（特磯昭５１
−１５７７２７号）。Therefore, in order to cover these two points, that is, the amount of heat and the mass balance, by energizing the carbonaceous floating layer, the temperature inside the furnace increases using carbon as a heating medium, and furthermore, Fe203 A process has been proposed in which 3CO or Fe203+3'2C= actively promotes the direct reduction reaction of e+3'2C02, thereby significantly increasing the productivity of the furnace (Tokuiso Sho 51).
-157727).
本発明は、この浮遊式製鉄プロセスにおいて安定な温度
制御を行うことを目的としたもので、炭素質で形成され
る浮遊層に電極より通電、加熱し、この浮遊層に酸化鉄
原料を投入、沈降させて還元鉄を製造する浮遊式製鉄プ
ロセスにおいて、浮遊層の温度変化と電気抵抗の変化と
の関係を測定すると共に、前記電極を含む回路に電流調
整器を設け、前記浮遊層の被加熱物に直接通電し、前記
温度変化による電気抵抗の変化に対して投入電力量が常
に一定になるよう、電流を調整することを特徴とする浮
遊式製鉄プロセスの温度制御方法に係るものである。以
下、図面を参照しつつ本発明を具体的に説明する。The purpose of the present invention is to perform stable temperature control in this floating iron manufacturing process.The purpose of the present invention is to conduct electricity through electrodes to heat the floating layer formed of carbonaceous material, and introduce iron oxide raw material into this floating layer. In a floating iron manufacturing process in which reduced iron is produced by sedimentation, the relationship between temperature changes and electrical resistance changes in the floating layer is measured, and a current regulator is provided in the circuit including the electrodes to control the heating of the floating layer. The present invention relates to a temperature control method for a floating steelmaking process, which is characterized in that current is applied directly to an object and the current is adjusted so that the amount of input power is always constant despite changes in electrical resistance due to temperature changes. Hereinafter, the present invention will be specifically described with reference to the drawings.
前述のように、浮遊式製鉄プロセスにおいて浮遊層の炭
素質に通電すると、該炭素質の性質上、第１図に示すよ
うに浮遊層の温度が上昇するに伴い電気抵抗が小さくな
り、更に電流が流れると温度が更に上昇・・・・・・・
・・というように、浮遊層の電気抵抗は負特性を示し、
そのため温度制御が困難になる。As mentioned above, when electricity is applied to the carbonaceous material in the floating layer in the floating steelmaking process, due to the nature of the carbonaceous material, as the temperature of the floating layer increases, the electrical resistance decreases, and the current further increases. As it flows, the temperature rises further...
...The electrical resistance of the floating layer exhibits negative characteristics,
This makes temperature control difficult.
そこで電極を含む回路に電流調整器を入れ、第１図のよ
うに温度の変化に伴う電気抵抗値の変化に対し常時一定
の電力が投入出来るように、電流を変化させて、被加熱
物（炭素質）に直接通電して加熱すれば安定な温度制御
が出来る。第２図は本発明の制御方法を実施するための
装置の一例として電流調整器による温度制御を概略的に
示すものである。１は還元炉（反応塔）であり、該還元
炉１の頂部には、酸化鉄原料（鉄鉱石、酸化べレット等
）Ａを炉内に投入するための原料ホッパ２と、炭素質の
一例としての炭素粒体Ｂを炉内に装入するための炭素ホ
ッパ３とがシュート４を介し設けてある。Therefore, a current regulator is inserted into the circuit containing the electrodes, and as shown in Figure 1, the current is changed so that a constant amount of power can be applied to the object to be heated ( Stable temperature control can be achieved by heating the carbonaceous material by directly applying electricity to it. FIG. 2 schematically shows temperature control using a current regulator as an example of a device for carrying out the control method of the present invention. Reference numeral 1 denotes a reduction furnace (reaction tower), and at the top of the reduction furnace 1 there is a raw material hopper 2 for charging iron oxide raw material (iron ore, oxide pellets, etc.) A into the furnace, and an example of carbonaceous material. A carbon hopper 3 for charging carbon granules B into the furnace is provided via a chute 4.
また上言己炉１の底部には、プリヒータ５により予熱さ
れた気体（還元ガス）Ｃを炉内に導入する導入系６が接
続してあると共に、製品として還元鉄Ｄとチャー（コー
クス化の前段階のもの）Ｅとを分離させて取り出す抽出
系７が接続してある。また、上記炉１内には、後述する
ように炭素粒体Ｂの浮遊層Ｆが形成されるようになって
いるが、該浮遊層Ｆを通電、加熱するよう、所要数（例
えば３本）の電極８が上記炉１の内部に設けてあり、該
電極８，８，８に結んだ配線の途中には、例えば電流制
御用サィリスタ９と電流調整器１０と遮断器１１とが設
けてある。Furthermore, an introduction system 6 is connected to the bottom of the furnace 1 to introduce gas (reducing gas) C preheated by a preheater 5 into the furnace, and the products are reduced iron D and char (coking). An extraction system 7 is connected to separate and take out the previous step) E. Further, in the furnace 1, a floating layer F of carbon particles B is formed as described later, and the required number (for example, three) of floating layers F is applied so that the floating layer F is energized and heated. An electrode 8 is provided inside the furnace 1, and a current control thyristor 9, a current regulator 10, and a circuit breaker 11 are provided in the middle of the wiring connected to the electrodes 8, 8, and 8, for example. .
また電気抵抗検出器１２により炉内の加熱物（炭素質）
の電気抵抗が測定出来るようにしてあり、炉内加熱物（
炭素質）の電気抵抗の変化を測定し、投入電力を一定に
出釆るようにしてある。尚１３は電力制御器、１５は炉
頂からの炉頂排ガス系１４の途中に設けたベンチュリー
スクラバー兼クーラ、１６は前記導入系６の途中に設け
た流量コントロール弁である。In addition, the electrical resistance detector 12 detects the heated material (carbonaceous) in the furnace.
It is possible to measure the electrical resistance of the heated object in the furnace (
The change in electrical resistance of carbonaceous material is measured, and the input power is kept constant. 13 is a power controller, 15 is a venturi scrubber/cooler provided midway through the furnace top exhaust gas system 14 from the furnace top, and 16 is a flow rate control valve provided midway through the introduction system 6.
次に、この還元炉１による製鉄プロセスの運転について
述べると、先ず炉の始動期に際しては、子熱（或は加熱
）された還元ガスＣを炉内に吹き込むと、この還元ガス
（還元雰囲気）Ｃは、炉頂から炉頂排ガスＧとして排出
され、再度炉内に循環される。Next, to describe the operation of the iron manufacturing process using this reducing furnace 1, first, during the startup period of the furnace, when a heated (or heated) reducing gas C is blown into the furnace, this reducing gas (reducing atmosphere) C is discharged from the top of the furnace as top exhaust gas G and is circulated into the furnace again.
この循環を繰り返すことにより循環ガスの還元度は上昇
していく。ここで炉内に予め装入されていた炭素粒体Ｂ
が、上記雰囲気中に浮遊し炉内に炭素粒体Ｂの浮遊式流
動層即ち浮遊層Ｆが形成される。次に、電源（図示しな
い）より電極８，８，８間に電圧の印加すると、前記浮
遊層Ｆを形成する炭素粒体Ｂに通電され、ジュール熱に
より炉内温度が上昇する。By repeating this circulation, the degree of reduction of the circulating gas increases. Here, carbon granules B that had been charged in advance in the furnace
are suspended in the above atmosphere, and a floating fluidized bed of carbon particles B, ie, a floating layer F, is formed in the furnace. Next, when a voltage is applied between the electrodes 8, 8, 8 from a power source (not shown), the carbon particles B forming the floating layer F are energized, and the temperature in the furnace increases due to Joule heat.
この状態で、炉内に酸化鉄原料Ａが投入されると、上言
己浮遊層Ｆを通過して降下する。この酸化鉄原料Ａが浮
遊層Ｆを通過する際に、次式（１）（０）（皿）、Ｆｅ
２０３十＊０＝がｅ＋＊０２ ・・・・・・（１
）Ｆｅ２０３十＊＝がｅ＋＊０ ・・・・・・
（０）Ｃ十Ｃ０２＝め○ …．・．
（瓜）で示す還元反応が起こり、酸化鉄原料Ａは上記浮
遊層Ｆの一酸化炭素により還元されつつ、一酸化炭素を
含む還元雰囲気則ち還元ガスが再成される。When the iron oxide raw material A is introduced into the furnace in this state, it passes through the floating layer F and descends. When this iron oxide raw material A passes through the floating layer F, the following formula (1) (0) (dish), Fe
2030*0=is e+*02...(1
)Fe2030*= is e+*0...
(0)C0C02=Me○….・．．
A reduction reaction shown by (melon) occurs, and the iron oxide raw material A is reduced by the carbon monoxide in the floating layer F, and a reducing atmosphere containing carbon monoxide, that is, a reducing gas is regenerated.
そして生成した還元鉄Ｄと、チャーＥとは分離されて取
り出され、チャーＥは炭素粒体として炭素ホツパ３に送
られる。ここで上述のような製鉄プロセスにおける温度
制御について説明する。The generated reduced iron D and char E are separated and taken out, and the char E is sent to the carbon hopper 3 as carbon particles. Here, temperature control in the above-mentioned iron manufacturing process will be explained.
前述の運転に先立ち、ケース／ゞィケースに応じ実験し
て例えば第１図の如き特性を示すグラフを求める。Prior to the above-mentioned operation, experiments are conducted depending on the case/case, and a graph showing characteristics as shown in FIG. 1, for example, is obtained.
第１図の場合浮遊層の温度が上昇すると、浮遊層の電気
抵抗が負特性を示すので各温度での電気抵抗値を測定し
ておき、該所定電力値を電力制御器１３に設定しておく
。この状態で前述の運転を行うと、運転中、電気抵抗検
出器１２により浮遊層Ｆの電気抵抗が測定され、該測定
信号は電力制御器１３に送られ、ここで前記設定信号と
比較される。In the case of FIG. 1, when the temperature of the floating layer increases, the electrical resistance of the floating layer exhibits negative characteristics, so the electrical resistance value at each temperature is measured and the predetermined power value is set in the power controller 13. put. When the above operation is performed in this state, the electrical resistance of the floating layer F is measured by the electrical resistance detector 12 during the operation, and the measurement signal is sent to the power controller 13, where it is compared with the setting signal. .
ここでＰ＝ＦＲ＝青の鰍物（Ｐ：勅、
１：電流、Ｒ：電気抵抗、Ｖ：電圧）電力を一定に制御
しようとした場合、浮遊層の電気抵抗が浮遊層の温度上
昇とともに小となるので、入力される電力が小となって
しまう。Here, P = FR = blue porridge (P: electric current, R: electrical resistance, V: voltage) If you try to control the power to a constant value, the electrical resistance of the floating layer will increase as the temperature of the floating layer increases. Therefore, the input power becomes small.
従って電力制御器１３より信号を出し電流調整器１川こ
より電流を変化させることによって、浮遊層に投入され
る電力が一定になるように制御することにより通電加熱
する。以上述べたように本発明の浮遊式製鉄プロセスの
温度制御は、電流調整器を回路に入れることにより投入
電力が温度変化に（対し）伴い一定になるようにするの
で、困難な温度制御を安定に且つ容易に行うことができ
る。Therefore, the power controller 13 outputs a signal and the current regulator 1 changes the current, thereby controlling the power input to the floating layer to be constant, thereby heating the floating layer. As described above, the temperature control of the floating steelmaking process of the present invention makes it possible to stabilize the difficult temperature control by inserting a current regulator into the circuit so that the input power remains constant as the temperature changes. It can be done easily and easily.
第１図は浮遊層の電気抵抗と温度との特性関係を示すグ
ラフ、第２図は本発明の温度制御方法を実施するための
装置の一例を示す概略図である。
１・・・・・・還元炉、８・・・・・・電極、９・・・
・・・電流制御用サィリスタ、１０・・・・・・電流調
整器、１１・・・・・・遮断器、１２・…・・電気抵抗
検出器、１３・・・・・・電力制御器、Ａ・・・・・・
酸化鉄原料、Ｂ・…・・炭素粒体、Ｄ・・・・・・還元
鉄、Ｆ・・・・・・浮遊層。
第１図
第２図FIG. 1 is a graph showing the characteristic relationship between the electrical resistance of a floating layer and temperature, and FIG. 2 is a schematic diagram showing an example of an apparatus for carrying out the temperature control method of the present invention. 1... Reduction furnace, 8... Electrode, 9...
... Current control thyristor, 10... Current regulator, 11... Circuit breaker, 12... Electric resistance detector, 13... Power controller, A...
Iron oxide raw material, B...Carbon particles, D...Reduced iron, F...Floating layer. Figure 1 Figure 2
Claims (1)
、この浮遊層に酸化鉄原料を投入、沈降させて還元鉄を
製造する浮遊式製鉄プロセスにおいて、浮遊層の温度変
化と電気抵抗の変化との関係を測定すると共に、前記電
極を含む回路に電流調整器を設け、前記浮遊層の被加熱
物に直接通電し、前記温度変化による電気抵抗の変化に
対して投入電力量が常に一定になるよう、電流を調整す
ることを特徴とする浮遊式製鉄プロセスの温度制御方法
。1 In the floating iron manufacturing process, in which a floating layer formed of carbonaceous material is energized and heated by electrodes, iron oxide raw materials are introduced into this floating layer, and reduced iron is produced by settling, the temperature change of the floating layer and the electrical resistance In addition to measuring the relationship with the change in temperature, a current regulator is installed in the circuit including the electrode, and current is applied directly to the object to be heated in the floating layer, so that the amount of input power is always constant against changes in electrical resistance due to the temperature change. A temperature control method for a floating steelmaking process, which is characterized by adjusting the current so that
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13752478A JPS6014807B2 (en) | 1978-11-08 | 1978-11-08 | Temperature control method for floating steelmaking process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13752478A JPS6014807B2 (en) | 1978-11-08 | 1978-11-08 | Temperature control method for floating steelmaking process |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5565310A JPS5565310A (en) | 1980-05-16 |
| JPS6014807B2 true JPS6014807B2 (en) | 1985-04-16 |
Family
ID=15200683
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13752478A Expired JPS6014807B2 (en) | 1978-11-08 | 1978-11-08 | Temperature control method for floating steelmaking process |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6014807B2 (en) |
-
1978
- 1978-11-08 JP JP13752478A patent/JPS6014807B2/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5565310A (en) | 1980-05-16 |
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