JP3529160B2 - Control method of electric melting furnace - Google Patents
Control method of electric melting furnaceInfo
- Publication number
- JP3529160B2 JP3529160B2 JP13856094A JP13856094A JP3529160B2 JP 3529160 B2 JP3529160 B2 JP 3529160B2 JP 13856094 A JP13856094 A JP 13856094A JP 13856094 A JP13856094 A JP 13856094A JP 3529160 B2 JP3529160 B2 JP 3529160B2
- Authority
- JP
- Japan
- Prior art keywords
- melting furnace
- electric melting
- raw material
- molten metal
- weight
- 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 - Fee Related
Links
Landscapes
- Vertical, Hearth, Or Arc Furnaces (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、火力発電所のボイラ等
から多量に排出される石炭灰や、無機質廃棄物の溶融処
理に用いられる電気溶融炉の制御方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for controlling an electric melting furnace used for melting treatment of a large amount of coal ash discharged from a boiler or the like of a thermal power plant and inorganic waste.
【０００２】[0002]
【従来の技術】石炭灰やその他の無機質廃棄物の処理方
法として、電気溶融炉においてこれらを溶融してスラグ
化し、骨材や道路舗装用ブロック等を製造する方法で注
目されている。このような電気溶融炉の運転に際して
は、出湯量、原料供給量、電極への通電量を制御する必
要があり、従来は次のような制御法が採用されていた。2. Description of the Related Art As a method for treating coal ash and other inorganic wastes, attention has been paid to a method of manufacturing aggregates, road paving blocks, etc. by melting these in an electric melting furnace to form slag. In the operation of such an electric melting furnace, it is necessary to control the amount of tapping hot water, the amount of raw material supply, and the amount of electricity supplied to the electrodes. Conventionally, the following control method has been adopted.
【０００３】まず出湯量の制御は、電気溶融炉から出湯
した溶湯を作業員が一定時間毎に直接柄杓で受けて単位
時間当りの出湯量に換算し、電気溶融炉の出湯量調節弁
（コントロールニードル）を調整していた。しかしこの
方法は精度が低いこと、連続監視ができないこと、1000
℃を越える高温の溶湯を扱うために危険であること、測
定に多くの手数がかかること等の問題があった。First, the amount of molten metal discharged from the electric melting furnace is directly received by a worker at a ladle every fixed time and converted into the amount of molten metal discharged per unit time. I was adjusting the needle. However, this method has low accuracy, continuous monitoring is not possible, 1000
However, there are problems such as the danger of handling a molten metal having a temperature higher than 0 ° C. and the large number of steps required for measurement.
【０００４】また原料供給量の制御は、電気溶融炉内の
溶湯レベルを監視しながら、溶湯レベルが上下しないよ
うに原料供給機の原料供給速度を調整していた。しかし
この方法は電気溶融炉内における溶湯レベルの正確な測
定自体が容易ではなく、従って溶湯レベルを一定に維持
することは容易ではないこと、溶湯レベルの測定や原料
供給機の原料供給速度の調整に多くの手数がかかること
等の問題があった。In controlling the amount of raw material supplied, the raw material supply rate of the raw material feeder is adjusted so that the molten metal level does not rise or fall while monitoring the molten metal level in the electric melting furnace. However, this method does not make it easy to accurately measure the molten metal level in the electric melting furnace, and therefore it is not easy to maintain the molten metal level at a constant level.Measurement of the molten metal level and adjustment of the raw material feed rate of the raw material feeder There was a problem that it took a lot of trouble.
【０００５】更に通電量の制御は、上記した出湯量と原
料供給量がバランスし、しかも安定した出湯温度が得ら
れるようにする必要があり、安定した運転ができるよう
になるまでに熟練を要すること、常時制御盤による調節
が必要であること等の問題点があった。Further, in controlling the energization amount, it is necessary to balance the above-mentioned hot water discharge amount and raw material supply amount and to obtain a stable hot water discharge temperature, and it requires skill until stable operation can be performed. However, there is a problem that the control panel needs to be constantly adjusted.
【０００６】[0006]
【発明が解決しようとする課題】本発明は上記した従来
の問題点を解決して、正確な測定が困難な炉内の溶湯レ
ベルの測定を行うことなく、電気溶融炉を安定に制御す
ることができる電気溶融炉の制御方法を提供するために
なされたものである。DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned conventional problems and stably controls the electric melting furnace without measuring the molten metal level in the furnace, which is difficult to measure accurately. The present invention has been made to provide a control method of an electric melting furnace capable of performing the above.
【０００７】[0007]
【課題を解決するための手段】上記の課題を解決するた
めになされた本発明の電気溶融炉の制御方法は、電気溶
融炉の炉体重量と、原料供給重量とを連続的に測定し
て、それらの重量変化から電気溶融炉の出湯量を演算
し、電気溶融炉の炉体重量の変化をゼロに維持しつつ演
算された出湯量が設定値となるように、原料供給機の原
料供給速度および電気溶融炉の出湯量調節弁を調整する
ことを特徴とするものである。なお、原料供給重量は原
料供給機の重量から測定してもよい。また電気溶融炉か
ら出湯する溶湯温度を連続的に測定し、電極への通電量
を制御する工程を付加することが好ましい。The control method for an electric melting furnace of the present invention made to solve the above-mentioned problems is achieved by continuously measuring the weight of a furnace body of an electric melting furnace and the weight of raw material supplied. , The amount of hot water discharged from the electric melting furnace is calculated from these changes in weight, and the raw material is supplied from the raw material feeder so that the calculated amount of hot water is set while maintaining the change in the weight of the furnace body of the electric melting furnace at zero. It is characterized in that the speed and the amount of hot water discharged from the electric melting furnace are adjusted. The raw material supply weight may be measured from the weight of the raw material supply machine. Further, it is preferable to add a step of continuously measuring the temperature of the molten metal discharged from the electric melting furnace and controlling the amount of electricity supplied to the electrodes.
【０００８】[0008]
【作用】本発明によれば、電気溶融炉の炉体重量と原料
供給重量とを測定して出湯量を演算し、原料供給機の原
料供給速度および電気溶融炉の出湯量調節弁を調整する
ようにしたので、従来のように出湯量を直接測定した
り、電気溶融炉内の溶湯レベルを監視する必要がなく、
簡便かつ正確に電気溶融炉を安定に制御することができ
る。また、溶湯温度を連続的に測定し、電極への通電量
を制御する工程を付加することにより、一層正確な運転
制御が可能となる。According to the present invention, the amount of molten metal discharged is calculated by measuring the weight of the furnace body of the electric melting furnace and the weight of the raw material supplied, and the raw material supply speed of the raw material feeder and the molten metal discharge control valve of the electric melting furnace are adjusted. Since it was done, there is no need to directly measure the amount of molten metal discharged or monitor the level of molten metal in the electric melting furnace as in the past.
The electric melting furnace can be stably controlled in a simple and accurate manner. Further, by adding a step of continuously measuring the molten metal temperature and controlling the amount of electricity supplied to the electrodes, more accurate operation control becomes possible.
【０００９】[0009]
【実施例】以下に本発明を図示の実施例に基づいて詳細
に説明する。図１において、１は電気溶融炉の炉体であ
る。炉体１の内部には複数本の電極２が設けられ、石炭
灰やその他の無機質廃棄物のような原料をジュール熱に
より1500℃以上の高温で溶解し、出湯量調節弁（コント
ロールニードル）３を備えた出湯口４から溶湯を出湯さ
せることができる構造となっている。この炉体１の全体
はロードセル等の重量測定手段５の上に搭載されてお
り、その重量変化を連続的に測定することができる。６
は炉体１に原料を供給する原料供給機であり、これもま
たロードセル等の重量測定手段７の上に搭載されてお
り、その重量変化を連続的に測定することにより、原料
供給重量を知ることができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to illustrated embodiments. In FIG. 1, reference numeral 1 is a furnace body of an electric melting furnace. A plurality of electrodes 2 are provided inside the furnace body 1, and raw materials such as coal ash and other inorganic wastes are melted at a high temperature of 1500 ° C. or higher by Joule heat, and a hot water flow control valve (control needle) 3 The structure is such that the molten metal can be discharged from the tap hole 4 provided with. The entire furnace body 1 is mounted on a weight measuring means 5 such as a load cell, and the weight change can be continuously measured. 6
Is a raw material feeder for supplying the raw material to the furnace body 1, which is also mounted on the weight measuring means 7 such as a load cell, and the raw material supply weight is known by continuously measuring the weight change. be able to.
【００１０】なお、８は各重量測定手段５、７の出力の
和を演算する加算器、９は電極２に通電するための電源
装置、10は出湯口４から流出する溶湯の温度を測定する
放射温度計等の溶湯温度計、11はこの電気溶融炉の全体
を制御する演算・制御器である。Numeral 8 is an adder for calculating the sum of the outputs of the weight measuring means 5 and 7, numeral 9 is a power supply for energizing the electrode 2, and numeral 10 is the temperature of the molten metal flowing out from the tap 4. A molten metal thermometer such as a radiation thermometer, and 11 are arithmetic and control units for controlling the entire electric melting furnace.
【００１１】実施例においては、原料供給機６から原料
を炉体１の溶湯表面に連続的に供給しつつ、電極２に通
電することにより原料を溶解し、出湯量調節弁３を備え
た出湯口４から溶湯を連続的に流出させている。この実
施例のように、原料供給機６をその内部に貯留された原
料を供給するだけの形式のものと仮定すると、重量測定
手段７により測定される原料供給機６の重量変化ΔＧ1
と、重量測定手段５により測定される炉体１の重量変化
ΔＧ2 と、出湯量Ｇ3 との間には、α×ΔＧ1 ＝ΔＧ2
＋Ｇ3 という関係が成立する。ここでαは、原料中の可
燃物量とこの可燃物の燃焼に伴い発生する燃焼ガスに同
伴する固形物量とを考慮した補正係数で、１以下の値を
取る。従って、原料を予め分析して補正係数αの値を設
定しておくとともに、ΔＧ1 とΔＧ2 を連続的に測定す
れば、演算・制御器11により出湯量Ｇ3 を演算すること
ができる。In the embodiment, while the raw material supply device 6 continuously supplies the raw material to the surface of the molten metal of the furnace body 1, the electrode 2 is energized to melt the raw material, and a discharge amount control valve 3 is provided. The molten metal is continuously discharged from the sprue 4. Assuming that the raw material feeder 6 is of a type that only feeds the raw material stored therein as in this embodiment, the weight change ΔG 1 of the raw material feeder 6 measured by the weight measuring means 7
Between the change in the weight of the furnace body 1 measured by the weight measuring means 5 ΔG 2 and the amount of tapping water G 3 , α × ΔG 1 = ΔG 2
The relationship of + G 3 is established. Here, α is a correction coefficient that takes into account the amount of combustible material in the raw material and the amount of solid matter that accompanies the combustion gas generated by the combustion of the combustible material, and takes a value of 1 or less. Therefore, if the raw material is analyzed in advance and the value of the correction coefficient α is set, and ΔG 1 and ΔG 2 are continuously measured, the operation / controller 11 can calculate the hot water discharge amount G 3 .
【００１２】そこでまず、演算・制御器11は出湯量調節
弁３を自動調節することによって、炉体１の重量変化Δ
Ｇ2 ＝０となるように出湯量を制御しつつ、演算された
出湯量Ｇ3 が設定値となるように、原料供給機６の原料
供給速度をも自動調節する。このように炉体１の重量変
化ΔＧ2 がゼロであるということは、溶湯レベルの変動
がないことを意味しているので、上記の制御を行うこと
によって溶湯レベルの変動を防止しつつ、設定された出
湯量を得ることができる。Therefore, first, the arithmetic / control unit 11 automatically adjusts the hot water discharge amount control valve 3 to change the weight Δ of the furnace body 1.
While controlling the hot water discharge amount so that G 2 = 0, the raw material supply speed of the raw material feeder 6 is also automatically adjusted so that the calculated hot water discharge amount G 3 becomes the set value. As described above, the fact that the weight change ΔG 2 of the furnace body 1 is zero means that there is no change in the melt level. Therefore, by performing the above control, the change in the melt level can be prevented while setting The amount of discharged hot water can be obtained.
【００１３】なお、溶湯温度計10により測定された溶湯
温度も演算・制御器11に入力され、演算・制御器11は溶
湯温度が設定値と一致するように電源装置９を自動調節
する。これによって、出湯量、溶湯レベルのみならず、
溶湯温度の制御も可能となる。上記のような制御を行う
ことによって、原料供給機６から石炭灰を500kg/hrの割
合で供給しつつ溶解を行い、1600℃の出湯温度を安定に
維持すると同時に500kg/hrの安定した出湯量を確保する
ことができた。The molten metal temperature measured by the molten metal thermometer 10 is also input to the arithmetic / control unit 11, and the arithmetic / control unit 11 automatically adjusts the power supply device 9 so that the molten metal temperature matches the set value. As a result, not only the amount of molten metal discharged and the level of molten metal,
It is also possible to control the melt temperature. By performing the control as described above, the coal ash is melted while being supplied from the raw material feeder 6 at a rate of 500 kg / hr, and the tapping temperature of 1600 ° C is stably maintained, and at the same time, a stable tapping rate of 500 kg / hr is obtained. Was able to be secured.
【００１４】[0014]
【発明の効果】以上に説明したように、本発明の電気溶
融炉の制御方法によれば、炉内の溶湯レベルの測定や出
湯量の直接測定を行うことなく、電気溶融炉を安定に制
御することができる。このような自動化を図ることによ
り、省力化を図ることができ、また電気溶融炉の操作に
熟練が不要となる。更に各種の原料に応じて溶湯温度の
設定を変えるだけで、原料の融点に応じた適切な温度で
出湯することが可能であり、エネルギ効率を向上させる
こともできる。As described above, according to the electric melting furnace control method of the present invention, the electric melting furnace can be stably controlled without measuring the molten metal level in the furnace or directly measuring the amount of molten metal discharged. can do. Such automation can save labor, and requires no skill in operating the electric melting furnace. Further, by simply changing the setting of the molten metal temperature according to various raw materials, it is possible to discharge the molten metal at an appropriate temperature according to the melting point of the raw materials, and it is possible to improve energy efficiency.
【図１】本発明の実施例を説明する制御系統図である。FIG. 1 is a control system diagram illustrating an embodiment of the present invention.
１ 炉体、２ 電極、３ 出湯量調節弁（コントロール
ニードル）、４ 出湯口、５ 重量測定手段、６ 原料
供給機、７ 重量測定手段、８ 加算器、９電源装置、
10 溶湯温度計、11 演算・制御器1 furnace body, 2 electrodes, 3 hot water discharge amount control valve (control needle), 4 hot water outlet, 5 weight measuring means, 6 raw material feeder, 7 weight measuring means, 8 adder, 9 power supply device,
10 Molten Thermometer, 11 Arithmetic / Controller
───────────────────────────────────────────────────── フロントページの続き (72)発明者 渡邉 恭史 東京都調布市西つつじケ丘２丁目４番１ 号 東京電力株式会社技術研究所内 (72)発明者 柳瀬 哲也 愛知県名古屋市瑞穂区須田町２番56号 日本碍子株式会社内 (72)発明者 冨山 裕 愛知県名古屋市瑞穂区須田町２番56号 日本碍子株式会社内 (72)発明者 村上 太一 愛知県名古屋市瑞穂区須田町２番56号 日本碍子株式会社内 (56)参考文献 特開 平５−78144（ＪＰ，Ａ) 特開 昭63−73089（ＪＰ，Ａ) 特開 平２−169990（ＪＰ，Ａ) 特開 平１−167578（ＪＰ，Ａ) 特開 昭59−189282（ＪＰ，Ａ) 特開 平４−179090（ＪＰ，Ａ) (58)調査した分野(Int.Cl.7，ＤＢ名) F27B 3/08 F27B 3/28 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kyoji Watanabe 2-4-1, Nishitsutsujigaoka, Chofu-shi, Tokyo Inside TEPCO Technical Research Institute (72) Inventor Tetsuya Yanase 2-56 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi No. 2 In Japan Insulator Co., Ltd. (72) Inventor Yutaka Toyama No. 2-56 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Prefecture In-house Co., Ltd. (72) Taichi Murakami No. 2-56 Suda-cho, Mizuho-ku, Nagoya-shi, Aichi Japan Insulator Co., Ltd. (56) Reference JP 5-78144 (JP, A) JP 63-73089 (JP, A) JP 2-169990 (JP, A) JP 1-167578 (JP , A) JP 59-189282 (JP, A) JP 4-179090 (JP, A) (58) Fields investigated (Int.Cl. 7 , DB name) F27B 3/08 F27B 3/28
Claims (3)
とを連続的に測定して、それらの重量変化から電気溶融
炉の出湯量を演算し、電気溶融炉の炉体重量の変化をゼ
ロに維持しつつ演算された出湯量が設定値となるよう
に、原料供給機の原料供給速度および電気溶融炉の出湯
量調節弁を調整することを特徴とする電気溶融炉の制御
方法。1. A furnace body weight of an electric melting furnace and a raw material supply weight are continuously measured, and the amount of molten metal discharged from the electric melting furnace is calculated from a change in these weights to change the furnace body weight of the electric melting furnace. A method for controlling an electric melting furnace, which comprises adjusting a raw material supply rate of a raw material supply device and a hot water discharge amount control valve of an electric melting furnace so that the calculated hot water discharge amount becomes a set value while maintaining zero.
重量とを連続的に測定して、それらの重量変化から電気
溶融炉の出湯量を演算し、電気溶融炉の炉体重量の変化
をゼロに維持しつつ演算された出湯量が設定値となるよ
うに、原料供給機の原料供給速度および電気溶融炉の出
湯量調節弁を調整することを特徴とする電気溶融炉の制
御方法。2. The furnace body weight of the electric melting furnace is calculated by continuously measuring the weight of the electric melting furnace and the weight of the raw material feeder, and calculating the amount of tapping water from the electric melting furnace from the change in the weights. Control of the electric melting furnace, which adjusts the raw material supply speed of the raw material feeder and the hot water discharge amount control valve of the electric melting furnace so that the calculated hot water discharge amount becomes a set value while maintaining the change of zero. Method.
的に測定し、電極への通電量を制御する工程を付加した
請求項１又は２に記載の電気溶融炉の制御方法。3. The method for controlling an electric melting furnace according to claim 1, further comprising the step of continuously measuring the temperature of the molten metal discharged from the electric melting furnace and controlling the amount of electricity supplied to the electrodes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13856094A JP3529160B2 (en) | 1994-06-21 | 1994-06-21 | Control method of electric melting furnace |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13856094A JP3529160B2 (en) | 1994-06-21 | 1994-06-21 | Control method of electric melting furnace |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH085248A JPH085248A (en) | 1996-01-12 |
| JP3529160B2 true JP3529160B2 (en) | 2004-05-24 |
Family
ID=15225004
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13856094A Expired - Fee Related JP3529160B2 (en) | 1994-06-21 | 1994-06-21 | Control method of electric melting furnace |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3529160B2 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ITUD20030231A1 (en) | 2003-11-27 | 2005-05-28 | Danieli Off Mecc | PRE-HEATING PROCEDURE, PROCESSING AND MERGER OF A METAL CHARGE AND ITS INSTALLATION. |
| JP2006035013A (en) * | 2004-07-22 | 2006-02-09 | Kansai Paint Co Ltd | Waste treatment system |
| ITMI20050626A1 (en) * | 2005-04-13 | 2006-10-14 | Technit Compagnia Tecnica Inte | APPARATUS FOR MEASURING AND MONITORING THE FEEDING OF CHARGING OR SCRAPPING MATERIAL AT A OVEN AND ITS PROCEDURE |
| ITUD20080019A1 (en) * | 2008-02-01 | 2009-08-02 | Danieli Officine Meccaniche Spa | CONTROL PROCEDURE FOR THE MERGER OF A METALLIC CHARGE AND WEIGHING DEVICE USED IN THIS PROCEDURE |
| CN102183150B (en) * | 2011-04-25 | 2013-07-03 | 中冶赛迪工程技术股份有限公司 | Quick feeding device for feeding waste steel into electric furnace and feeding method thereof |
-
1994
- 1994-06-21 JP JP13856094A patent/JP3529160B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH085248A (en) | 1996-01-12 |
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