JPH10158709A - Method for charging raw material into vertical type iron scrap melting surface - Google Patents
Method for charging raw material into vertical type iron scrap melting surfaceInfo
- Publication number
- JPH10158709A JPH10158709A JP31941096A JP31941096A JPH10158709A JP H10158709 A JPH10158709 A JP H10158709A JP 31941096 A JP31941096 A JP 31941096A JP 31941096 A JP31941096 A JP 31941096A JP H10158709 A JPH10158709 A JP H10158709A
- Authority
- JP
- Japan
- Prior art keywords
- furnace
- carbonaceous material
- iron scrap
- charging
- coke
- 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.)
- Withdrawn
Links
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
- Manufacture Of Iron (AREA)
- Vertical, Hearth, Or Arc Furnaces (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、炭材を熱源として
鉄スクラップを溶解し、製鋼用溶銑を製造する竪型鉄ス
クラップ溶解炉の原料装入方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a raw material charging method for a vertical iron scrap melting furnace for melting steel scrap using a carbonaceous material as a heat source to produce hot metal for steelmaking.
【０００２】[0002]
【従来の技術】従来から良く知られている鋳物用溶銑の
供給を目的としたキュポラにおける操業開始方法として
は、日本学術振興会の制定した標準操業法（日本学術振
興会第２４小委員会：「キュポラ」標準寸法及び標準操
業法（１９４０）や日本鋳物協会の制定した標準操業法
（日本鋳物協会標準キュポラ委員会：「キュポラ標準寸
法並びに標準溶解操業法」（１９４９）などがある。2. Description of the Related Art Conventionally, a well-known method of starting operation in a cupola for supplying hot metal for casting includes a standard operation method established by the Japan Society for the Promotion of Science (the 24th subcommittee of the Japan Society for the Promotion of Science: There are “Cupora” standard size and standard operating method (1940) and the standard operating method established by the Japan Foundry Association (Japan Casting Association Standard Cupola Committee: “Cupora Standard Dimension and Standard Melting Operating Method”) (1949).
【０００３】これらの操業法においては、ベッドコーク
スの装入、予熱、およびベッドコークス高さの調節後、
送風を停止した状態で地金とコークスの装入を開始す
る。送風は、地金とコークスの装入後２０〜４０分経過
した時点で開始する。したがって、この間炉内装入地金
とコークスは予熱済みのベッドコークスにより自然予熱
される。In these operating methods, after bed coke charging, preheating, and bed coke height adjustment,
Start charging the bullion and coke with the ventilation stopped. Blowing starts when 20 to 40 minutes have passed after charging the metal and coke. Accordingly, during this time, the furnace interior ingot and coke are naturally preheated by the preheated bed coke.
【０００４】前述のように、送風を停止した状態で鉄源
（地金）とコークスの装入を行うと、これらの原料の落
下エネルギーにより、コークスベッドがより密に充填さ
れ、コークスベッドの空隙率が低下する。この状態で送
風を開始するため、送風初期においては、通気性が阻害
され炉内圧力が上昇する。さらに、前述のキュポラにお
いては、鋳物用溶銑の供給を目的としていることから、
使用するコークス性状として、固定炭素が９２％程度、
灰分が８％程度、揮発分が２％以下、さらに硫黄が０．
７％以下といった高品質で、かつ粒径が１５０ｍｍ以上
の高価な鋳物コークスを使用している。このため、炉内
圧力の上昇は軽度であるが、これをより安価な高炉コー
クス、あるいは成形コークスと置換した場合、これから
は一般に粒径が小さく、灰分含有量が増加するので、空
隙率のさらなる低下を招き炉内圧力の異常上昇による送
風量の低下を引き起こす。As described above, when the iron source (metal) and coke are charged in a state in which the air supply is stopped, the coke bed is more densely filled by the falling energy of these raw materials, and the gap of the coke bed is reduced. The rate drops. Since air blowing is started in this state, in the initial stage of air blowing, air permeability is impaired, and the furnace pressure increases. Furthermore, in the aforementioned cupola, since the purpose is to supply hot metal for casting,
As the coke properties to be used, fixed carbon is about 92%,
The ash content is about 8%, the volatile content is 2% or less, and the sulfur content is 0.1%.
An expensive cast coke having a high quality of 7% or less and a particle size of 150 mm or more is used. For this reason, the increase in the furnace pressure is slight, but when this is replaced with a less expensive blast furnace coke or formed coke, the particle size is generally smaller and the ash content increases, so that the porosity is further increased. This causes a decrease in the flow rate due to an abnormal increase in the furnace pressure.
【０００５】加えて、コークス中の灰分が主成分である
ダストも増加するので充填層での目詰まりとこれによる
棚吊りを招く。従って、安定操業を阻害するばかりでな
く、操業不能となる場合も発生する。[0005] In addition, the amount of dust mainly composed of ash in coke is increased, which causes clogging in the packed bed and causes shelving. Therefore, not only does the stable operation be hindered, but also the operation becomes impossible.
【０００６】[0006]
【発明が解決しようとする課題】本発明は、前述の通気
性の阻害、圧力上昇、送風低下などの問題を解決するた
めに、特に鉄源として鉄スクラップ、炭材として安価な
高炉コークス、あるいは成形コークスを使用して製鋼用
溶銑を得るに際して、炉内圧力の異常上昇と棚吊りを回
避できる原料装入方法を提供することを目的とする。SUMMARY OF THE INVENTION The present invention is intended to solve the above-mentioned problems such as impaired air permeability, pressure rise, and reduced air flow. In particular, iron scrap as an iron source, inexpensive blast furnace coke as a carbon material, or It is an object of the present invention to provide a raw material charging method capable of avoiding an abnormal increase in furnace pressure and hanging a shelf when hot metal for steelmaking is obtained using molded coke.
【０００７】[0007]
【課題を解決するための手段】本発明は、上記課題を解
決するものであり、炉体下部に送風羽口を具備した竪型
炉を用いて、炭材の燃焼熱により鉄スクラップを溶解し
製鋼用溶銑を製造する操業の開始に当り、炉底から一定
高さまで炭材を装入し、この炭材に着火し、次いで該炭
材高さを一定高さに保ちつつ送風し、排ガス温度が一定
値以上となった後、送風しながら鉄源と炭材を交互に装
入することを特徴とする竪型鉄スクラップ溶解炉の原料
装入方法である。SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and uses a vertical furnace provided with a blowing tuyere at a lower part of a furnace body to melt iron scrap by heat of combustion of carbon material. At the start of the operation to produce hot metal for steelmaking, a carbon material is charged from the furnace bottom to a certain height, the carbon material is ignited, and then blown while maintaining the carbon material at a certain height, and the exhaust gas temperature is increased. The method for charging a raw material for a vertical iron scrap melting furnace is characterized by alternately charging an iron source and a carbonaceous material while blowing air after the temperature has reached a predetermined value.
【０００８】また、前記炉頂排ガス温度が７００℃未満
までは、炭材ベッドレベルを一定に保持するように、炉
上部から炭材のみ補給し、この温度が７００℃以上とな
った時点で鉄源と炭材の装入を開始すると好適である。
炉頂排ガス温度７００℃は、円滑な操業を開始するため
に炉温が適切に予熱されている最適状態を示すもので、
７００℃未満では、炉底のコークスベッドレベルがさら
に低下するのでスクラップ溶融操業を開始するのは好ま
しくなく、７００℃を大幅に上廻ると熱ロスが生ずるの
で不適切である。[0008] In addition, until the furnace top exhaust gas temperature is lower than 700 ° C, only the carbon material is replenished from the upper part of the furnace so as to keep the carbon material bed level constant. It is preferable to start charging the source and the carbonaceous material.
The furnace top exhaust gas temperature of 700 ° C indicates an optimal state in which the furnace temperature is appropriately preheated in order to start a smooth operation.
If the temperature is lower than 700 ° C., it is not preferable to start the scrap melting operation because the coke bed level at the furnace bottom is further lowered, and if the temperature is much higher than 700 ° C., heat loss occurs, which is inappropriate.
【０００９】[0009]
【発明の実施の形態】本発明者らは、本発明の課題とす
る竪型炉の送風初期における炭材と鉄スクラップの装入
方法と溶解特性について検討を行ったところ、以下の事
項が明らかとなった。 １）鉄源として、主に鉄スクラップを使用する製鋼用溶
銑の製造方法は、高炉法などの鉄鉱石を使用する方法と
比較して、酸化鉄を還元する必要がなく、鉄スクラップ
の加熱と溶解に必要な熱を供給すれば良いため、エネル
ギー使用量が少なくて済む。BEST MODE FOR CARRYING OUT THE INVENTION The present inventors have studied the charging method and melting characteristics of carbon material and iron scrap in the initial stage of blowing of a vertical furnace, which is the subject of the present invention, and found the following matters. It became. 1) The method of producing hot metal for steelmaking, which mainly uses iron scrap as an iron source, does not require reduction of iron oxide as compared with the method using iron ore such as the blast furnace method. Since it is sufficient to supply the heat necessary for melting, the amount of energy used is small.
【００１０】２）鉄スクラップの溶解における竪型炉の
使用は、炉の特性上排ガス温度を低位に維持できること
から熱効率を向上させることができ、エネルギー使用量
の点で有利となる。 ３）送風初期の竪型炉の操業を安定させる上で、特に鉄
スクラップの装入開始タイミングの適正化が重要であ
る。2) The use of a vertical furnace for melting iron scrap can improve the thermal efficiency because the exhaust gas temperature can be kept low due to the characteristics of the furnace, which is advantageous in terms of energy consumption. 3) In order to stabilize the operation of the vertical furnace in the early stage of blowing, it is particularly important to optimize the timing of starting charging of iron scrap.
【００１１】本発明は、以上のような知見に基づきなさ
れたものである。すなわち、本発明において骨子となる
技術は、 ａ）炭材ベッド上に、送風した状態で鉄スクラップと炭
材の装入を開始するもので、炭材ベッドに送風量に応じ
た上向きの力（浮力）を作用させた状態で鉄スクラップ
（鉄源）と炭材の装入を行うこととなる。このような装
入により、これらの原料の落下エネルギーが減衰して炭
材ベッドに伝達されるので、送風を停止した状態で原料
の装入を開始する従来の方法と比較して、炭材ベッドが
密に充填されることがなくなる。このことは、炭材ベッ
ド上に逐次形成される鉄スクラップと追加装入する炭材
の充填層にも同様のことが言える。この結果、炭材ベッ
ドの充填層および炭材ベッド上の充填層の空隙率の低下
が抑制されるので、送風初期の通気性の阻害による炉内
圧力の上昇を防止することができる。The present invention has been made based on the above findings. In other words, the key technology in the present invention is: a) starting charging of iron scrap and carbon material in a state of being blown on the carbon material bed, and applying an upward force ( With the buoyancy applied, iron scrap (iron source) and carbon material are charged. By such charging, the falling energy of these raw materials is attenuated and transmitted to the carbonaceous bed, so that compared to the conventional method of starting the raw material charging with the ventilation stopped, the carbonized bed is Will not be densely packed. The same can be said for the iron scrap sequentially formed on the carbonaceous material bed and the carbonaceous material to be additionally charged. As a result, a decrease in the porosity of the packed bed of the carbonaceous material bed and the packed bed on the carbonized material bed is suppressed, so that it is possible to prevent an increase in the furnace pressure due to impaired air permeability at the beginning of blowing.
【００１２】ｂ）また、前述の要領で鉄スクラップと炭
材の装入を開始することでによって、炭材中の灰分が主
成分であるダストが充填層中の空隙を通過し、炉外へ排
出される過程で充填層内に捕捉される割合が減少する。
このため、前述の事項と併せて送風初期の通気性の阻害
による炉内圧力の上昇を防止できる。 ｃ）さらに、前述の要領で鉄スクラップと炭材の装入を
開始するに際して、鉄スクラップを装入してから溶解開
始するまでの時間を短縮することは、炭材ベッドの燃焼
による消費を抑え、炭材ベッドレベルの低下による初期
出銑炭素濃度の低下を防止する意味で重要である。本発
明者らの知見によれば、鉄スクラップを装入してから溶
解開始するまでの時間と炉頂排ガス温度との間には良い
相関関係があり、炉頂排ガス温度が７００℃未満では炭
材ベッドレベルを一定に保持するように炉上部から炭材
のみ装入し、炉頂排ガス温度が７００℃以上となった時
点で鉄スクラップと炭材の交互装入を開始することによ
って、炭材ベッドレベルの低下と鉄スクラップ溶解以外
の炭材の消費量を最小限に抑えつつ、鉄スクラップの溶
解を開始することが可能となる。B) Further, by starting charging of the iron scrap and the carbon material in the manner described above, dust mainly composed of ash in the carbon material passes through the voids in the packed bed and goes out of the furnace. The rate of trapping in the packed bed during the discharge process is reduced.
For this reason, in addition to the above-mentioned matter, it is possible to prevent an increase in furnace pressure due to impaired air permeability in the initial stage of air blowing. c) Further, in starting the charging of the iron scrap and the carbon material in the manner described above, shortening the time from the charging of the iron scrap to the start of melting can reduce the consumption due to the combustion of the carbon material bed. It is important to prevent a decrease in the initial tapping carbon concentration due to a decrease in the carbon bed level. According to the findings of the present inventors, there is a good correlation between the time from charging of iron scrap to the start of melting and the furnace top exhaust gas temperature. By charging only the carbon material from the upper part of the furnace so as to keep the material bed level constant and starting the alternate charging of iron scrap and carbon material when the furnace exhaust gas temperature reaches 700 ° C or higher, the carbon material It becomes possible to start melting iron scrap while minimizing the bed level and the consumption of carbonaceous material other than melting iron scrap.
【００１３】[0013]
【実施例】図１は、本発明の実施に用いた竪型鉄スクラ
ップ溶解炉の模式縦断面図、図２、図３はそれぞれその
Ａ−Ａ矢視断面図、Ｂ−Ｂ矢視断面図である。図１に示
すように、竪型炉１の炉頂部からベルトコンベヤ２を介
してコークス５と石灰石、鉄スクラップ６を交互に装入
する。図２，３に示すように、竪型炉１の横断面では鉄
スクラップ６の充填層とコークス５の充填層が交互に形
成されている。竪型炉１の炉体下部に設置した１次送風
羽口３及び２次燃焼用羽口４から空気あるいは酸素富化
空気７を送風して、連続的に溶銑８を製造する。FIG. 1 is a schematic vertical sectional view of a vertical iron scrap melting furnace used for carrying out the present invention, and FIGS. 2 and 3 are sectional views taken along arrows AA and BB, respectively. It is. As shown in FIG. 1, coke 5, limestone, and iron scrap 6 are alternately charged from the furnace top of a vertical furnace 1 via a belt conveyor 2. As shown in FIGS. 2 and 3, the bed of iron scrap 6 and the bed of coke 5 are alternately formed in the cross section of the vertical furnace 1. Air or oxygen-enriched air 7 is blown from a primary blowing tuyere 3 and a secondary combustion tuyere 4 installed at a lower part of the furnace body of the vertical furnace 1 to continuously produce hot metal 8.
【００１４】本発明の一実施例として、溶解能力が３．
０ｔ／ｈのキュポラを用いて２０ｔのスクラップを溶解
した。キュポラで使用した鉄スクラップはサイズが２５
〜１５０ｍｍのシュレッダ屑であり、炭材としては、サ
イズが３０〜７５ｍｍの高炉コークスを使用した。操業
は、まず送風開始３時間前に炉底からのコークスベッド
レベル（炭材高さ）が１．５５ｍとなるように高炉コー
クスを３５０ｋｇ装入し、炉底部に設けた点検孔よりガ
スバーナに点火し、コークスベッドに着火させた。ガス
としては製鉄所で発生するコークス炉ガスを用いた。送
風開始１５分前に前記バーナを消火し、点検孔を耐火レ
ンガで塞いだ。In one embodiment of the present invention, the dissolving ability is 3.
20 t of scrap was dissolved using 0 t / h cupola. Iron scrap used in cupola is 25 size
Shredder waste of ~ 150 mm, and blast furnace coke with a size of 30 to 75 mm was used as the carbonaceous material. First, 350 kg of blast furnace coke was charged so that the coke bed level (carbon material height) from the furnace bottom was 1.55 m three hours before the start of air blowing, and the gas burner was ignited from an inspection hole provided in the furnace bottom. Then, the coke bed was ignited. The coke oven gas generated in the steel works was used as the gas. The burner was extinguished 15 minutes before the start of blowing, and the inspection hole was closed with firebrick.
【００１５】次に、１次送風羽口３と２次燃焼用羽口４
からの送風空気中の酸素流量の合計を３４７Ｎｍ3 ／ｈ
とした上で、１次送風羽口３からは酸素濃度が３０ｖｏ
ｌ％（一定）の酸素富化空気を供給し、２次燃焼用羽口
４からは空気をそれぞれ供給した。送風中、炉頂排ガス
温度が７００℃となるまでは、コークスベッドレベルが
１．５５ｍとなるように適時高炉コークスを装入しコー
クスベッドレベルが一定高さとなるように調整した。な
お、炉内の原料レベルは、サウンデイングレベル計を用
いて適時測定した。Next, a tuyere 3 for primary blast and a tuyere 4 for secondary combustion
The total oxygen flow rate in the blast air from 347 Nm 3 / h
And the oxygen concentration is 30 vo
1% (constant) oxygen-enriched air was supplied, and air was supplied from the tuyere 4 for secondary combustion. During the blowing, blast furnace coke was charged at an appropriate time so that the coke bed level was 1.55 m until the furnace top exhaust gas temperature reached 700 ° C., and the coke bed level was adjusted to a constant height. The raw material level in the furnace was measured at appropriate times using a sounding level meter.
【００１６】また、コークスベッド上への鉄スクラップ
（鉄源）と高炉コークス（炭材）の装入は、炉頂排ガス
９の温度が７００℃以上となった時点で開始した。な
お、１回当たりの鉄スクラップ装入量は３００ｋｇ一定
とし、１回当たりの高炉コークスの装入量は、前述の鉄
スクラップ１回分の溶解と炉底からのコークスベッドレ
ベル１．５５ｍを維持するのに必要な量とした。The charging of iron scrap (iron source) and blast furnace coke (carbonaceous material) onto the coke bed was started when the temperature of the furnace top exhaust gas 9 reached 700 ° C. or higher. The charging amount of iron scrap per one time is constant at 300 kg, and the charging amount of blast furnace coke per one time is the melting of one iron scrap described above and the coke bed level from the furnace bottom is maintained at 1.55 m. And the amount needed for
【００１７】さらに、原料の装入要領としては、高炉コ
ークスと石灰石、次いで鉄スクラップの順番とし、装入
物レベルが１次送風羽口３の上方３．５±０．２ｍとな
るように装入インターバルを調整した。以上の実施例に
おける操業の結果、送風開始後６分に原料の装入を開始
し、送風開始後１３分に溶解開始を確認した。また、送
風開始後２５分に出銑孔から出銑開始し、鋳銑機に注湯
した。送風初期にコークスベッドレベルを１．５５ｍと
するために装入した高炉コークスは３０ｋｇであった。The charging procedure of the raw materials is as follows: blast furnace coke, limestone, and then iron scrap. The charging level is 3.5 ± 0.2 m above the primary tuyere 3. Adjusted the entry interval. As a result of the operation in the above example, charging of the raw material was started 6 minutes after the start of the blowing, and melting start was confirmed 13 minutes after the start of the blowing. In addition, tapping was started from a tap hole 25 minutes after the start of blowing, and poured into a casting machine. The blast furnace coke charged to set the coke bed level to 1.55 m in the early stage of blowing was 30 kg.
【００１８】溶解成績として、出銑温度、および炭素濃
度が安定した送風開始後４３分以降の平均値で示すと、
溶解速度３．０ｔ／ｈ、出銑温度１，５２８℃、出銑炭
素濃度２．７４重量％、溶解用高炉コークス原単位１０
２ｋｇ／ｔを得た。また、炉頂排ガス９のＣＯとＣＯ2
の分析から得られる２次燃焼率は４１％であった。 （比較例１）前述の実施例と同様の設備と操業条件、お
よびコークスベッドの予熱方法に従うが、コークスベッ
ド上に鉄スクラップと高炉コークスを１次送風羽口３の
上方３．１５ｍまで装入した後、送風を開始した。As the melting performance, when the tapping temperature and the carbon concentration are shown as an average value after 43 minutes from the start of the air blowing,
Melting speed 3.0 t / h, tapping temperature 1,528 ° C, tapping carbon concentration 2.74% by weight, blast furnace coke unit consumption for melting 10
2 kg / t were obtained. In addition, CO and CO 2 in the furnace top exhaust gas 9
The secondary combustion rate obtained from the analysis was 41%. (Comparative Example 1) The same equipment and operating conditions as in the above-described embodiment and the method of preheating the coke bed were followed, but iron scrap and blast furnace coke were charged on the coke bed up to 3.15 m above the primary blowing tuyere 3. After that, blowing was started.
【００１９】以上の比較例１における操業の結果、送風
開始直後から炉内圧力が１，３００ｈＰａと異常上昇し
た。さらに、送風開始後２７分には炉内圧力のさらなる
上昇に伴い、全送風量が空気換算で４００Ｎｍ3 ／ｈま
で低下した。この現象は、送風開始後４５分経過しても
改善されず操業を中止するに至った。操業後、炉内を解
体調査した結果、コークスベッド上部に隣接する最下段
の鉄スクラップ層においては、部分溶融しており、炉底
にはこの層が溶解したと思われる地金が約１２０ｋｇ存
在していた。As a result of the operation in Comparative Example 1, the pressure inside the furnace was abnormally increased to 1,300 hPa immediately after the start of blowing. Further, 27 minutes after the start of the air blowing, the total air blowing amount was reduced to 400 Nm 3 / h in air with the further increase in the furnace pressure. This phenomenon was not improved even after 45 minutes from the start of blowing, and the operation was stopped. After the operation, the inside of the furnace was dismantled and inspected. As a result, the lowermost iron scrap layer adjacent to the upper part of the coke bed was partially melted, and there was about 120 kg of ingot at the bottom of the furnace that seemed to have melted this layer. Was.
【００２０】また、コークスベッド上部に隣接する最下
段の鉄スクラップ層と２段目の鉄スクラップ層の間に
は、約０．５ｍの空間が存在していた。すなわち、２段
目の鉄スクラップ層が棚吊りしており、この層の鉄スク
ラップが密に充填され、各スクラップ片の間隙にはＳｉ
Ｏ2 とＡｌ2 Ｏ3 を主成分とするスラグが多量に付着し
ているのが確認された。Further, a space of about 0.5 m was present between the lowermost iron scrap layer adjacent to the upper part of the coke bed and the second iron scrap layer. That is, the second-stage iron scrap layer is suspended from the shelf, the iron scrap in this layer is densely filled, and the gap between the scrap pieces is Si.
It was confirmed that a large amount of slag mainly composed of O 2 and Al 2 O 3 was attached.
【００２１】さらに、送風羽口上のコークスベッドの状
態として、コークスが密に充填されているのが確認され
た。 （比較例２）前述の実施例と同様の設備と操業条件、お
よびコークスベッドの予熱方法に従うが、コークスベッ
ド上への鉄スクラップ（鉄源）と高炉コークス（炭材）
の装入を、送風開始後炉頂排ガスが５００℃となった時
点で開始した。Further, it was confirmed that coke was densely packed as the state of the coke bed on the blowing tuyere. (Comparative Example 2) The same equipment and operating conditions as in the above-described embodiment and the method of preheating the coke bed were used, but iron scrap (iron source) and blast furnace coke (charcoal) on the coke bed were used.
Was started when the exhaust gas from the furnace reached 500 ° C. after the start of the air supply.
【００２２】比較例２における操業の結果、送風開始後
２分に原料の装入を開始し、送風開始後１７分に溶解開
始を確認した。また、送風開始後２９分に出銑孔から出
銑開始し、鋳銑機に注湯した。送風初期にコークスベッ
ドレベルを１．５５ｍとするために装入した高炉コーク
スは１０ｋｇであった。しかしながら、鉄スクラップと
高炉コークスを装入してから溶解開始するまでに１５分
間要した。このため、実施例と比較して約０．３ｍのコ
ークスベッドレベルの低下を招いた。このことに起因し
て、初期出銑炭素濃度が２．１３ｗｔ％と低下してしま
い、出銑孔から出た溶銑が鋳銑機まで流入する途中の樋
で部分凝固した。As a result of the operation in Comparative Example 2, charging of the raw material was started two minutes after the start of the blowing, and it was confirmed that melting started 17 minutes after the start of the blowing. In addition, tapping was started from a tap hole 29 minutes after the start of blowing, and was poured into a casting machine. The blast furnace coke charged to set the coke bed level to 1.55 m in the early stage of blowing was 10 kg. However, it took 15 minutes from charging iron scrap and blast furnace coke to starting melting. For this reason, the coke bed level was reduced by about 0.3 m as compared with the example. Due to this, the initial tapping carbon concentration was reduced to 2.13 wt%, and the hot metal exiting from the taphole was partially solidified in the gutter on the way to the casting machine.
【００２３】このため、追加装入するコークス量の増加
によるコークスベッドレベルの調整などの操作により、
操業が安定したのが送風開始後６５分と実施例と比較し
て２２分の時間遅れを招いた。溶解成績として、出銑温
度、および炭素濃度が安定した送風開始後６５分以降の
平均値では、実施例と同様の値が得られたものの、合計
の高炉コークス原単位では実施例と比較例してコークス
ベッドレベルの調整を行ったことに起因して１０ｋｇ／
ｔ余分に要した。For this reason, the operation of adjusting the coke bed level by increasing the amount of coke to be additionally charged, and the like,
The stable operation resulted in a time delay of 22 minutes compared to the example, 65 minutes after the start of the ventilation. As the melting performance, the average value after 65 minutes from the start of the blowing, in which the tapping temperature and the carbon concentration were stable, obtained the same value as in the example, but compared with the example in the total blast furnace coke basic unit. 10kg / kg due to adjustment of coke bed level
It took t extra.
【００２４】上述の実施例と比較例から明らかなよう
に、本発明によれば操業を阻害することなく、安定して
スクラップから製鋼用溶銑を得ることが可能となる。As is clear from the above Examples and Comparative Examples, according to the present invention, it is possible to stably obtain hot metal for steelmaking from scrap without impeding the operation.
【００２５】[0025]
【発明の効果】本発明によれば、竪型炉を用いて鉄スク
ラップの溶解を行うに際して、安定的に効率的に操業す
ることができるという優れた効果を発揮する。According to the present invention, an excellent effect of stably and efficiently operating steel scrap when melting a steel scrap using a vertical furnace is exhibited.
【図１】竪型鉄スクラップ溶解炉の縦断面である。FIG. 1 is a vertical section of a vertical iron scrap melting furnace.
【図２】図１のＡ−Ａ矢視縦断面である。FIG. 2 is a vertical sectional view taken along the line AA of FIG.
【図３】図１のＢ−Ｂ矢視縦断面である。FIG. 3 is a vertical sectional view taken along the line BB in FIG. 1;
１ 竪型炉 ２ ベルトコンベヤ ３ １次送風羽口 ４ ２次燃焼用羽口 ５ コークス（炭材） ６ 鉄スクラップ（鉄源） ７ 空気あるいは酸素富化空気 ８ 溶銑 ９ 排ガス DESCRIPTION OF SYMBOLS 1 Vertical furnace 2 Belt conveyor 3 Primary blowing tuyere 4 Secondary combustion tuyere 5 Coke (carbon material) 6 Iron scrap (iron source) 7 Air or oxygen-enriched air 8 Hot metal 9 Exhaust gas
Claims (2)
用いて、炭材の燃焼熱により鉄スクラップを溶解し製鋼
用溶銑を製造する操業の開始に当り、炉底から一定高さ
まで炭材を装入し、この炭材に着火し、次いで該炭材高
さを一定高さに保ちつつ送風し、排ガス温度が一定値以
上となった後、送風しながら鉄源と炭材を交互に装入す
ることを特徴とする竪型鉄スクラップ溶解炉の原料装入
方法。At the start of the operation of melting iron scrap by the heat of combustion of carbonaceous material and producing hot metal for steelmaking using a vertical furnace equipped with a blowing tuyere at the lower part of the furnace body, a certain height from the furnace bottom is obtained. Charcoal is charged, and the carbon is ignited and then blown while maintaining the height of the carbon at a constant level. After the exhaust gas temperature exceeds a certain value, the iron source and the carbon are blown while blowing. A raw material charging method for a vertical iron scrap melting furnace, wherein the raw material is charged alternately.
は、炉上部から炭材のみを補給し、該温度が７００℃以
上となった時点で鉄源と炭材の装入を開始することを特
徴とする請求項１記載の竪型鉄スクラップ溶解炉の原料
装入方法。2. When the furnace top exhaust gas temperature is lower than 700 ° C., only the carbon material is supplied from the upper part of the furnace, and when the temperature reaches 700 ° C. or more, charging of the iron source and the carbon material is started. The method for charging raw materials for a vertical iron scrap melting furnace according to claim 1, characterized in that:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31941096A JPH10158709A (en) | 1996-11-29 | 1996-11-29 | Method for charging raw material into vertical type iron scrap melting surface |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP31941096A JPH10158709A (en) | 1996-11-29 | 1996-11-29 | Method for charging raw material into vertical type iron scrap melting surface |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH10158709A true JPH10158709A (en) | 1998-06-16 |
Family
ID=18109889
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP31941096A Withdrawn JPH10158709A (en) | 1996-11-29 | 1996-11-29 | Method for charging raw material into vertical type iron scrap melting surface |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH10158709A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008150667A (en) * | 2006-12-18 | 2008-07-03 | Jfe Steel Kk | Method for producing molten iron using vertical-type scrap melting furnace |
| WO2009031369A1 (en) * | 2007-09-06 | 2009-03-12 | Nippon Steel Corporation | Method of operating vertical furnace |
-
1996
- 1996-11-29 JP JP31941096A patent/JPH10158709A/en not_active Withdrawn
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008150667A (en) * | 2006-12-18 | 2008-07-03 | Jfe Steel Kk | Method for producing molten iron using vertical-type scrap melting furnace |
| WO2009031369A1 (en) * | 2007-09-06 | 2009-03-12 | Nippon Steel Corporation | Method of operating vertical furnace |
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