JPH044379B2 - - Google Patents
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- Publication number
- JPH044379B2 JPH044379B2 JP3776087A JP3776087A JPH044379B2 JP H044379 B2 JPH044379 B2 JP H044379B2 JP 3776087 A JP3776087 A JP 3776087A JP 3776087 A JP3776087 A JP 3776087A JP H044379 B2 JPH044379 B2 JP H044379B2
- Authority
- JP
- Japan
- Prior art keywords
- raw material
- control system
- amount
- water
- feed
- 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.)
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 71
- 239000002994 raw material Substances 0.000 claims description 62
- 238000000034 method Methods 0.000 claims description 23
- 238000005245 sintering Methods 0.000 claims description 11
- 239000011159 matrix material Substances 0.000 description 3
- 238000007796 conventional method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 235000006506 Brasenia schreberi Nutrition 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 235000019738 Limestone Nutrition 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000006028 limestone Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
Landscapes
- Manufacture And Refinement Of Metals (AREA)
Description
【発明の詳細な説明】
産業上の利用分野
本発明は焼結原料の水分制御方法に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a method for controlling moisture in sintered raw materials.
従来の技術
製鉄業における焼結工程では、粉鉱石、石灰
石、粉コークス等の焼結原料はミキサーで混合さ
れると共に一定水分となるように水が添加され、
焼結機へと供給されて焼結鉱となる。この焼結工
程において、焼結原料の水分は焼結鉱の生産性、
品質（焼結鉱粒度、焼結鉱還元粉化率等）を安定
化させる重要な要因であり、この水分を目標の値
に制御する方法として、特公昭47−9035号公報、
特公昭50−20528号公報、特公昭60−22051号公報
などに記載の方法が提案されている。Prior Art In the sintering process in the steel industry, sintering raw materials such as ore powder, limestone, and coke powder are mixed in a mixer, and water is added to maintain a constant moisture content.
It is supplied to a sintering machine and becomes sintered ore. In this sintering process, the moisture content of the sintering raw material increases the productivity of the sintered ore.
It is an important factor in stabilizing the quality (sintered ore particle size, sintered ore reduction powdering rate, etc.), and as a method to control this moisture to a target value, Japanese Patent Publication No. 1987-9035,
Methods described in Japanese Patent Publication No. 50-20528, Japanese Patent Publication No. 60-22051, etc. have been proposed.
第３図は特公昭47−9035号公報に記載の方法を
示す図であり、同図においてW1〜W4は原料ホツ
パー、C1は切出コンベヤー、C2は装入コンベヤ
ー、C3は移送コンベヤー、Ｍはミキサー、Ｈは
ホツパーであり、３１は水分計、３３−１，３３
−２は演算制御器、３４−１，３４−２は流量調
節器を含む散水装置、３５は遅延回路である。こ
の第３図に示した制御方法は、水分添加前の原料
の水分の予測値またの測定値によるフイード・フ
オワード制御と水添加後の原料水分の測定値によ
るフイード・バツク制御を組合わせた方法であ
り、ミキサーへの添加水素系統を前後二段に分割
し、前段ではフイード・フオワード制御に基く添
加水量のウエイトを大きくしてハンギングを防
ぎ、後段においてはフイード・バツク制御に基ず
く添加水量のウエイトを大きくしてその補正効果
を高めるようにしたものである。 Figure 3 is a diagram showing the method described in Japanese Patent Publication No. 47-9035. In the figure, W 1 to W 4 are raw material hoppers, C 1 is a cutting conveyor, C 2 is a charging conveyor, and C 3 is a charging conveyor. Transfer conveyor, M is mixer, H is hopper, 31 is moisture meter, 33-1, 33
-2 is an arithmetic controller, 34-1 and 34-2 are water sprinklers including flow rate regulators, and 35 is a delay circuit. The control method shown in Fig. 3 is a method that combines feed forward control based on predicted or measured moisture content of the raw material before water addition and feed back control based on the measured raw material moisture content after water addition. The hydrogen addition system to the mixer is divided into two stages: front and rear, and the first stage increases the weight of the amount of added water based on feed forward control to prevent hanging, and the second stage increases the weight of the amount of added water based on feed back control. The weight is increased to enhance the correction effect.
発明が解決しようとする問題点
前記した従来の方法でもある程度の水分制御は
できるが、次に述べるような点から、制御精度は
未だ不充分であつた。即ち、ミキサーへの添加
水量を算出するにあたつて用いるところの水添加
前の原料水分は、実際は刻々変動しているもので
あるが、従来法においては予測または実測した水
添加前の原料水分を長時間に亘つて一定値とみな
して制御を行つていたので、目標水分への制御精
度は不充分であつた。ミキサーへの添加水量の
算出式は比較的に単純な式が用いられ、且つ、こ
の算出式に含まれるところの各係数は、予め経験
的に定めた値を、原料輸送量や水分の変動に係わ
りなく長時間に亘つて修正することなく用いてい
たため、目標水分への制御精度は不充分であつ
た。Problems to be Solved by the Invention Although the conventional methods described above can control moisture to a certain extent, the control accuracy is still insufficient due to the following points. In other words, the moisture content of the raw material before water addition, which is used to calculate the amount of water added to the mixer, actually fluctuates from moment to moment, but in the conventional method, the predicted or measured moisture content of the raw material before water addition is used. Since control was carried out by assuming that the water content was a constant value over a long period of time, the accuracy of controlling the target moisture content was insufficient. A relatively simple formula is used to calculate the amount of water added to the mixer, and each coefficient included in this calculation formula is based on a value determined empirically in advance based on changes in the amount of raw material transported and moisture content. Since it was used for a long time without any modification, the accuracy of controlling the target moisture content was insufficient.
本発明は上記の点に鑑み、目標水分の制御精度
を一層高めた焼結原料水分制御方法を提供するこ
とを目的とする。 In view of the above-mentioned points, an object of the present invention is to provide a sintering raw material moisture control method that further improves the control accuracy of target moisture.
問題点を解決するための手段
この目的を達成するための本発明方法は、焼結
原料への添加水量を制御して原料水分が目標値に
なるように制御する焼結工程における原料水分制
御方法において、水添加前の原料水分にもとづく
フイード・フオワード制御系と水添加後の原料水
分にもとずくフイード・バツク制御系とを組合わ
せて全体の制御系を構成し、水添加後の原料水分
の目標値をフイード・フオワード制御系の目標値
とフイード・バツク制御系の目標値とにある分割
比率をもつて仮想分割し、フイード・フオワード
制御系においては、添加水量と水添加後の原料水
分と水添加前の原料輸送量の各実測値とをもとに
時々刻々算出した水添加前の原料水分の予測値を
用いてフイード・フオワード制御系の必要添加水
量を算出し、フイード・バツク制御系において
は、水添加後の原料水分実測値を前記フイード・
バツク制御系の目標値に応じて補正した値を用
い、且つ原料水分と原料輸送量との変動に応じて
補正される係数を含む添加水量算出式を用いてフ
イード・バツク制御系の必要添加水量を算出し、
これら算出したフイード・フオワード制御系の必
要添加水量およびフイード・バツク制御系の必要
添加水量の合計値をもつて焼結原料への添加水量
とすることを特徴とする焼結原料の水分制御方法
である。Means for Solving the Problems The method of the present invention to achieve this objective is a raw material moisture control method in a sintering process that controls the amount of water added to the sintering raw material so that the raw material moisture reaches a target value. The overall control system is constructed by combining a feed forward control system based on the moisture content of the raw material before water addition and a feed back control system based on the moisture content of the raw material after water addition. The target value of is virtually divided into the target value of the feed forward control system and the target value of the feed back control system using a certain division ratio. The required amount of added water for the feed forward control system is calculated using the predicted value of the raw material moisture before water addition, which is calculated from moment to moment based on the measured value of the raw material transport amount before water addition, and the feed back control is performed. In the system, the measured raw material moisture content after water addition is
The required amount of added water for the feed back control system is calculated using a value corrected according to the target value of the back control system and a formula for calculating the amount of added water that includes a coefficient that is corrected according to fluctuations in raw material moisture and raw material transport amount. Calculate,
A method for controlling moisture in a sintered raw material, characterized in that the calculated total amount of added water required for the feed forward control system and required added water amount for the feed back control system is used as the amount of water added to the sintered raw material. be.
作 用 以下、本発明を詳しく説明する。Effect The present invention will be explained in detail below.
焼結原料の水分制御プロセスにおいて、水添加
前の原料水分Riと添加水量Uw（ton／hr）と水添
加後の原料水分ROと水添加前の原料輸送量Ui
（ton／hr）との間には次の関係がある。 In the moisture control process of sintered raw materials, the raw material moisture R i before water addition, the amount of added water U w (ton/hr), the raw material moisture R O after water addition, and the raw material transport amount Ui before water addition
(ton/hr) has the following relationship.
Ro＝Ui・Ri＋Uw／Ui＋Uw ……(1)
この(1)式は、本発明におけるフイード・フオワ
ード制御系において、水添加前の原料水分を他の
実測値から予測し、この予測値に基いて添加水量
を算出する際に用いる。 Ro=U i・R i +U w /U i +U w ...(1) This equation (1) is used to predict the raw material moisture before water addition from other measured values in the feed forward control system of the present invention. , is used when calculating the amount of water to be added based on this predicted value.
また、ミキサー内の物質バランスを記述する方
程式は下式
∂w／∂t＝−D1∂2Un／∂x 2−∂Un／∂x＋UH ……(2)
で水分バランスを記述する方程式は下式
∂w・Ｒ／∂t＝−D2・∂2R／∂x2−∂Un・Ｒ／∂x＋U
H……(3)
で表される。 In addition, the equation that describes the material balance in the mixer is the following formula: ∂ w ／∂ t ＝−D 1 ∂ 2 U n ／∂ x 2 −∂U n ／∂ x +U H ……(2) describes the water balance. The equation is as follows: ∂w・R/∂ t = −D 2・∂ 2 R／∂x 2 −∂U n・R/∂x＋U
H is expressed as (3).
ここでｔ；時刻
ｘ；ミキサー内での水添加位置（ｍ）
D1；原料逆流係数（ｍ）
ｗ；位置ｘにおける単位長の原料重量（ton／ｍ）
Un；位置ｘにおける原料輸送量（ton／hr）
UH；位置ｘにおける単位長の添加水量（ton／hr.
m）
Ｒ；位置ｘにおける原料水分
D2；水分逆流係数（ton・ｍ／hr）
但し、(2)式、(3)式は実際の制御に用いるには複
雑すぎるので、近似式として次式を用いる。 Here, t: Time x: Water addition position in the mixer (m) D 1 ; Raw material backflow coefficient (m) w: Weight of raw material per unit length at position x (ton/m) U n : Amount of raw material transported at position x (ton/hr) U H ;Amount of water added per unit length at position x (ton/hr.
m) R: Raw material moisture content D 2 at position Use.
dW／dt＝Ui＋Uw−Up ……(4)
dW・ｒ／dt＝Ui・Ri＋Uw−Up・Rp ……(5)
ｒ＝α（Ri＋Uw／Ui）
＋（１−α）｛β・Rp＋(1-β)・θ・dR／dt｝
……(6)
ここでＷ；散水スパン内の原料重量（ton）
α；０＜α＜１の係数
β；０＜β＜１の係数
θ；時間換算係数（hr）
Up；水添加後の原料輸送量（ton／hr）
(4)式、(5)式および(6)式の意味は、(4)式は物質バ
ランス、(5)式は水分バランス、および(6)式は散水
スパン内の原料水分の平均値を表す方程式であ
る。 dW/dt=U i +U w −U p …(4) dW・r/dt=U i・R i +U w −U p・R p …(5) r=α(R i +U w /U i ) +(1-α) {β・R p +(1-β)・θ・dR/dt} ...(6) where W: Weight of raw material within the watering span (ton) α; 0<α< Coefficient β of 1; Coefficient θ of 0<β<1; Time conversion coefficient (hr) U p ; Amount of raw material transported after water addition (ton/hr) Equations (4), (5), and (6) The meaning is that Equation (4) represents the material balance, Equation (5) represents the moisture balance, and Equation (6) represents the average value of raw material moisture within the sprinkling span.
(4)式の左辺は制御系としては微小なため０とす
る。 The left side of equation (4) is set to 0 because it is minute for a control system.
なお、上記(4)式、(5)式および(6)式は、ミキサー
内の散水スパンが短い場合（散水系統が一段の場
合）の方程式であり、散水スパンが長い場合（散
水系統が多段の場合）は、(4)式、(5)式および(6)式
における入出力の関係を利用して必要な次数の近
似方程式を得ることができる。 Note that equations (4), (5), and (6) above are equations when the water sprinkling span in the mixer is short (when the water sprinkling system is in one stage), and when the water sprinkling span is long (when the water sprinkling system is in multiple stages). ), an approximate equation of the required order can be obtained using the input-output relationships in equations (4), (5), and (6).
(4)式、(5)式および(6)式において、水添加位置か
ら水分計取り付け位置迄の輸送遅れ時間Ｌ（hr）
を考慮し、制御理論の状態方程式にまとめると次
の方程式系が得られる。 In formulas (4), (5), and (6), transportation delay time L (hr) from the water addition position to the moisture meter installation position
By considering and summarizing it into the state equation of control theory, the following system of equations is obtained.
dX（ｔ）／dt＝Ａ・Ｘ（ｔ）＋Ｂ・｛Uw（ｔ−Ｌ）
＋UE（ｔ−Ｌ）｝ ……(7)
ただし、
Ｘ＝x1
x2、
x1＝Rp（ｔ）、x2（ｔ）＝dx1（ｔ）／dtの
２×１マトリクス ……（８−１）
Ａ＝０ １
−K2・UO／Ｗ−Ｋ
の２×２マトリクス ……（８−２）
Ｂ＝０
K2/Wの２×１マトリクス …(8-3)
K1＝β／〔（１−β）・θ〕 ……（８−４）
K2＝ｌ／〔（１−α）・（１−β）・θ〕
……（８−５）
UE（ｔ）＝Ui（ｔ）・Ri（ｔ）−α・Ｗ・
［dRi／dt−ｄ／dt（Uw（ｔ）／Ui（ｔ））］（８
−６）
である。さらに各種誤差を外乱項ｄ（ｔ）として
(7)式に加え、(9)式を得る。 dX(t)/dt=A・X(t)+B・{U w (t-L) +U E (t-L)} ...(7) However, X=x 1 x 2 , x 1 = R p (t), x 2 (t) = dx 1 (t) / dt 2 × 1 matrix ... (8-1) A = 0 1 -K 2 · U O /W-K 2 × 2 matrix ... (8-2) 2×1 matrix of B=0 K 2 /W ...(8-3) K 1 = β/[(1-β)・θ] ...(8-4) K 2 = l/[ (1-α)・(1-β)・θ〕
...(8-5) U E (t)=U i (t)・R i (t)−α・W・ [dR i /dt−d/dt(U w (t)/U i (t) ) ] (8
-6). Furthermore, various errors are set as disturbance term d(t).
In addition to equation (7), we obtain equation (9).
dX（ｔ）／dt＝Ａ・Ｘ（ｔ）＋Ｂ・Ｕ（ｔ−Ｌ） ＋ｄ（ｔ−Ｌ） ……(9) ただしＵ（ｔ−Ｌ）＝Uw（ｔ−Ｌ） ＋UE（ｔ−Ｌ） ……(10) である。dX(t)/dt=A・X(t)+B・U(t-L) +d(t-L)...(9) However, U(t-L)=U w (t-L) +U E ( t-L) ...(10).
以下、（８−１）〜（８−６）式を(8)式と略称
する。 Hereinafter, formulas (8-1) to (8-6) will be abbreviated as formula (8).
この(9)式、(10)式は、本発明におけるフイード・
バツク制御系において、原料輸送量、散水スパン
内の原料重量、添加水量、水添加後の原料水分量
の各実測値に応じてマトリクスＡ，Ｂを修正設定
したうえで添加水量を算出する際に用いる。 These equations (9) and (10) are
In the back control system, when calculating the amount of added water after correcting and setting the matrices A and B according to the actual measured values of the amount of raw material transported, the weight of the raw material within the sprinkling span, the amount of added water, and the amount of moisture in the raw material after water addition. use
実施例
第１図は本発明の実施例における制御系の構成
を示す図である。本実施例の制御系は、フイー
ド・フオワード制御系とフイード・バツク制御系
で構成され、フイード・バツク制御系は適応型プ
ロセス・モデル制御系である。第１図で、第３図
と同じ符号を付した各装置は焼結工程の各装置で
あつて、第３図の各装置と同様の装置である。第
１図において１は目標水分設定器であり、水添加
後の水分目標値Raをフイード・フオワード制御
系の目標値Rffとフイード・バツク制御系の目標
値Rfbにある分割比率ｍをもつて仮想的に分割し
て設定する。即ち、
Ra＝Rff＋Rfb ……（11−１）
Rfb＝ｍ・Ra ……（11−２）
Rff＝（１−ｍ）・Ra ……（11−３）
ただし ０＜ｍ＜１
ここで分割比率ｍは予め実験により定めた値を
用いてもよいが、本実施例では水添加前の原料水
分Riに対応させた表を予め作成しておき、後述
の原料水分Riの予備値に対応した値を抽出する。Embodiment FIG. 1 is a diagram showing the configuration of a control system in an embodiment of the present invention. The control system of this embodiment is composed of a feed forward control system and a feed back control system, and the feed back control system is an adaptive process model control system. In FIG. 1, each device with the same reference numeral as in FIG. 3 is a sintering process device, and is the same device as each device in FIG. 3. In Fig. 1, reference numeral 1 is a target moisture setting device, which hypothetically sets the moisture target value Ra after water addition using a dividing ratio m between the target value Rff of the feed forward control system and the target value Rfb of the feed back control system. Divide and set. That is, Ra = R ff + R fb ... (11-1) R fb = m・Ra ... (11-2) R ff = (1-m)・Ra ... (11-3) However, 0<m< 1 Here, a value determined in advance by experiment may be used as the division ratio m, but in this example, a table corresponding to the raw material moisture Ri before water addition is created in advance, and the preliminary raw material moisture Ri, which will be described later, is prepared in advance. Extract the value corresponding to the value.
目標値Rffはフイード・フオワード制御系の添
加水量を算出する演算器３に対して設定され、目
標値Rfbはフイード・バツク制御系の添加水量を
算出する演算器５に対して設定される。２は水添
加前の原料水分Riを予測演算する演算器であり、
添加水流量計９からの添加水量Uwの実測値と
原料水分検出計８からの水添加後の原料水分Ro
の実測値と水添加前原料重量検出器１０からの
水添加前の原料輸送量Uiの実測値とを用いて(1)
式から水添加前の原料水分Riの予測値を算出す
る。なお、この演算において用いる各実測値の測
定タイミングの遅れを補償することは云うまでも
ない。また予測値の算出の周期は、水添加前原料
重量検出器１０の位置から原料水分検出計８の位
置まで焼結原料を輸送するのに要する時間に合わ
せて定め、その都度の算出値をそのまま予測値と
して用いてもよいが、移動平均法、自己回帰モデ
ル法（AR法）等の手法により、周期的な変動や
突発的な異常値を補正したうえで予測値とするこ
とが好ましい。 The target value R ff is set for the calculator 3 that calculates the amount of water added to the feed/forward control system, and the target value R fb is set for the calculator 5 that calculates the amount of water added to the feed/back control system. . 2 is a calculation unit that predicts and calculates the raw material moisture R i before adding water;
The actual measured value of the amount of added water U w from the added water flow meter 9 and the raw material moisture Ro after water addition from the raw material moisture detector 8
(1) using the actual measured value of
The predicted value of the raw material moisture R i before water addition is calculated from the formula. Note that it goes without saying that the delay in measurement timing of each actual measurement value used in this calculation must be compensated for. In addition, the cycle of calculating the predicted value is determined according to the time required to transport the sintered raw material from the position of the raw material weight detector 10 before water addition to the position of the raw material moisture detector 8, and the calculated value each time is used as is. Although it may be used as a predicted value, it is preferable to use a method such as a moving average method or an autoregressive model method (AR method) to correct periodic fluctuations and sudden abnormal values before using it as a predicted value.
３はフイード・フオワード制御系の添加水量を
演算する演算器であり、水添加前水分予測演算器
２からの水添加前の原料水分Riの予測値と目標水
分設定器１からのフイード・フオワード系御系の
水分目標値Rffと水添加前原料重量検出器１０か
らの水添加前の原料輸送量Uiの実測値とを用い
て(1)式からフイード・フオワード制御系の添加水
量Uw 3 is a calculator that calculates the amount of added water in the feed forward control system, and it calculates the predicted value of the raw material moisture R i before water addition from the pre-water addition moisture prediction calculator 2 and the feed forward from the target moisture setting device 1. Using the water target value R ff of the system and the actual measured value of the amount of raw material transported before water addition U i from the raw material weight before water addition detector 10, the amount of added water U of the feed forward control system can be determined from equation (1). w
Claims (1)
目標値になるよう制御する焼結工程における原料
水分制御方法において、 水添加前の原料水分にもとずくフイード・フオ
ワード制御系と水添加後の原料水分にもとずくフ
イード・バツク制御系とを組合わせて全体の制御
系を構成し、水添加後の原料水分の目標値をフイ
ード・フオワード制御系の目標値とフイード・バ
ツク制御系の目標値とにある分割比率をもつて仮
想分割し、フイード・フオワード制御系において
は、添加水量と水添加後の原料水分と水添加前の
原料輸送量の各実測値とをもとに時々刻々算出し
た水添加前の原料水分の予測値を用いてフイー
ド・フオワード制御系の必要添加水量を算出し、
フイード・バツク制御系においては、水添加後の
原料水分実測値を前記フイード・バツク制御系の
目標値に応じて補正した値を用い、且つ原料水分
と原料輸送量との変動に応じて補正される係数を
含む添加水量算出式を用いてフイード・バツク制
御系の必要添加水量を算出し、これら算出したフ
イード・フオワード制御系の必要添加水量および
フイード・バツク制御系の必要添加水量の合計値
をもつて焼結原料への添加水量とすることを特徴
とする焼結原料の水分制御方法。[Claims] 1. A raw material moisture control method in a sintering process in which the amount of water added to the sintering raw material is controlled so that the raw material moisture reaches a target value. The overall control system is constructed by combining the forward control system and the feed/back control system based on the moisture content of the raw material after water addition, and the target value of the moisture content of the raw material after water addition is set to the target value of the feed/forward control system. and the target value of the feed-back control system, and in the feed-forward control system, the actual measured values of the amount of added water, the raw material moisture after water addition, and the raw material transport amount before water addition are The amount of water required for the feed forward control system is calculated using the predicted value of the raw material moisture before water addition, which is calculated from time to time based on
The feed back control system uses a value that is corrected from the actual measured raw material moisture value after water addition according to the target value of the feed back control system, and is also corrected according to fluctuations in the raw material moisture content and the amount of raw material transported. Calculate the required amount of added water for the feed/back control system using the formula for calculating the amount of added water that includes the coefficient, and calculate the total value of the calculated amount of added water for the feed/forward control system and the amount of added water required for the feed/back control system. A method for controlling moisture in a sintered raw material, characterized in that the amount of water added to the sintered raw material is controlled.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3776087A JPS63206434A (en) | 1987-02-23 | 1987-02-23 | Moisture control method for sintered raw materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3776087A JPS63206434A (en) | 1987-02-23 | 1987-02-23 | Moisture control method for sintered raw materials |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63206434A JPS63206434A (en) | 1988-08-25 |
| JPH044379B2 true JPH044379B2 (en) | 1992-01-28 |
Family
ID=12506425
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3776087A Granted JPS63206434A (en) | 1987-02-23 | 1987-02-23 | Moisture control method for sintered raw materials |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63206434A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100415931B1 (en) * | 1999-10-26 | 2004-01-31 | 주식회사 포스코 | Water injection controlling method of raw materials for making sintered ore |
-
1987
- 1987-02-23 JP JP3776087A patent/JPS63206434A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63206434A (en) | 1988-08-25 |
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