JP4379172B2 - Coal charge control method for coke oven carbonization chamber - Google Patents

Coal charge control method for coke oven carbonization chamber Download PDF

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JP4379172B2
JP4379172B2 JP2004085920A JP2004085920A JP4379172B2 JP 4379172 B2 JP4379172 B2 JP 4379172B2 JP 2004085920 A JP2004085920 A JP 2004085920A JP 2004085920 A JP2004085920 A JP 2004085920A JP 4379172 B2 JP4379172 B2 JP 4379172B2
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coal
carbonization chamber
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charging
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JP2005272549A (en
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明徳 吉岡
政章 丸岡
悦太郎 河田
隆義 新保
義雄 谷
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JFE Steel Corp
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    • C—CHEMISTRY; METALLURGY
    • C10—PETROLEUM, GAS OR COKE INDUSTRIES; TECHNICAL GASES CONTAINING CARBON MONOXIDE; FUELS; LUBRICANTS; PEAT
    • C10B—DESTRUCTIVE DISTILLATION OF CARBONACEOUS MATERIALS FOR PRODUCTION OF GAS, COKE, TAR, OR SIMILAR MATERIALS
    • C10B41/00—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke
    • C10B41/005—Safety devices, e.g. signalling or controlling devices for use in the discharge of coke for charging coal

Description

本発明は、コークス炉における炭化室への石炭の効率的な装入が可能なコークス炉炭化室への石炭の装入量制御方法に関する。   The present invention relates to a method for controlling the amount of coal charged into a coke oven carbonization chamber capable of efficiently charging coal into the carbonization chamber in the coke oven.

石炭を乾留してコークスにするコークス炉は、燃焼室と炭化室とが交互に配置され、燃焼室と炭化室とは耐火煉瓦の隔壁（炉壁煉瓦）で仕切られている。炭化室には上方から装入車のホッパに積んだ石炭が装入される。石炭は炭化室の両側に配置された燃焼室の熱で乾留され、コークスとされる。この乾留されたコークスは、押出し機の押出しラムによって側方から押され、炭化室から排出される。   In a coke oven in which coal is carbonized into coke, combustion chambers and carbonization chambers are alternately arranged, and the combustion chambers and the carbonization chamber are partitioned by a refractory brick partition wall (furnace wall brick). The charcoal chamber is charged with coal loaded on the hopper of the charging vehicle from above. Coal is dry-distilled with the heat of the combustion chambers arranged on both sides of the carbonization chamber to produce coke. The carbonized coke is pushed from the side by the extrusion ram of the extruder and discharged from the carbonization chamber.

前記装入車から炭化室への石炭の装入は、通常４〜５ヶ所設けられた装入孔から行われるため、石炭の装入直後は装入された石炭による山と谷ができる。その後、装入された石炭による山と谷を平滑化するため、或いは、炭化室上部のガス道を確保するため、装入された石炭の上層部を、例えば、レベラーを往復させて均しを行う。   Since charging of coal into the carbonization chamber from the charging vehicle is normally performed from charging holes provided at 4 to 5 locations, immediately after the charging of coal, peaks and valleys are formed by the charged coal. Then, in order to smooth the peaks and valleys caused by the charged coal, or to secure a gas passage at the top of the carbonization chamber, the upper layer of the charged coal is leveled by, for example, reciprocating a leveler. Do.

実操業においては、所定の管理時間ごとに、前記レベラーによる均しの後に、石炭の装入孔４から装入された石炭２の上面高さの位置を、例えば、図３に示すような、計測用棒１０などを用いて一ヶ所計測し、その上面高さの位置が所定の管理範囲内となっているかどうかを管理している。その上面高さの位置が、管理範囲を越えている場合には、次の計測時までの間は、炭化室への石炭の装入量（以下、「装炭量」という。）を減らし、また、管理範囲を下回っている場合には、次の計測時までの間は、装炭量を増やすなどの調整を行っている。   In actual operation, after the leveling by the leveler at a predetermined management time, the position of the upper surface height of the coal 2 charged from the coal charging hole 4, for example, as shown in FIG. One place is measured using a measuring rod 10 or the like, and it is managed whether or not the position of the upper surface height is within a predetermined management range. If the position of the upper surface height exceeds the control range, the amount of coal charged into the carbonization chamber (hereinafter referred to as “the amount of coal”) is reduced until the next measurement. Moreover, when it is below the control range, adjustments such as increasing the amount of coal are made until the next measurement.

一方、例えば、特開平４−８７９６号公報（特許文献１）には、装入された石炭をレベラーにより平坦化するに際して、装入された石炭の量が所定の量に達した時点でレベラーを炉内に導入し、次いで残りの石炭の装入を行いながらレベリングを行う方法について記載されている。
特開平４−８７９６号公報 On the other hand, for example, in JP-A-4-8796 (Patent Document 1), when leveling the charged coal with a leveler, the leveler is set when the amount of charged coal reaches a predetermined amount. It describes a method of leveling while being introduced into the furnace and then charging the remaining coal.
Japanese Patent Application Laid-Open No. 4-8796

しかし、前記レベラーの１往復による均しでは、炭化室に装入された石炭の山谷を完全に平滑化することは難しく、図３に示す方法では、山の部分の高さのみを計測することとなるため、正確な装入量の把握ができず、装炭量が適正な量より少なくなる場合が多く、効率的な操業という観点からは課題を有していた。   However, it is difficult to smooth the crest of coal charged in the carbonization chamber completely by leveling by one round trip of the leveler. In the method shown in FIG. 3, only the height of the mountain portion is measured. Therefore, it is difficult to grasp the accurate charging amount, and the amount of coal loading is often less than the appropriate amount, which has a problem from the viewpoint of efficient operation.

また、上記特許文献１に記載の方法は、石炭の装入シーケンス及びレベラーの運転シーケンスが複雑となり、石炭の装入時間及びレベラーの運転時間が長くなり、効率的な操業の観点からは、やはり課題を有していた。   In addition, the method described in Patent Document 1 has a complicated coal charging sequence and leveler operating sequence, and the coal charging time and leveler operating time become long. From the viewpoint of efficient operation, too, Had a problem.

本発明は上記課題を解決するためになされたもので、簡易な方法により、コークス炉における炭化室への石炭の効率的な装入が可能なコークス炉炭化室への石炭の装入量制御方法を提供することを目的とする。   The present invention has been made in order to solve the above-mentioned problems, and a method for controlling the amount of coal charged into a coke oven carbonization chamber capable of efficiently charging coal into the carbonization chamber in a coke oven by a simple method. The purpose is to provide.

上記の課題は次の本発明により解決される。
［１］炭化室へ石炭を装入した後、該装入した石炭の上層部をレベラーにより均しを行う均し工程と、
該均し工程後の炭化室の炉頂に複数設けられた石炭の装入孔毎に、炭化室に装入された石炭の最上面の高さ位置、及び、装入された石炭の傾斜角度からなる石炭表面形状の計測を行う表面形状計測工程と、
該表面形状計測工程により計測された石炭表面の形状と、装入孔の間隔から計測された炭化室内に装入された石炭の表面形状とから炭化室に装入された石炭の装入量を推定する装入量推定工程と、
該装入量推定工程により推定された装入量に基づいて、次の炭化室への石炭の装入量を調整する装入量調整工程と
を有することを特徴とするコークス炉炭化室への石炭の装入量制御方法。
［２］上記［１］において、装入量調整工程により、次の炭化室への石炭の装入量を調整すると共に、
表面形状計測工程により計測された石炭表面の形状に基づいて、次の炭化室の均し工程でのレベラーによる均し回数及び／又はレベラーの均し速度の調整を行うことを特徴とするコークス炉炭化室への石炭の装入量制御方法。 The above-described problems are solved by the following present invention.
[1] A leveling step of leveling the upper layer of the charged coal with a leveler after charging the coal into the carbonization chamber;
For each of the coal charging holes provided at the top of the carbonization chamber furnace after the leveling step, the height position of the uppermost surface of the coal charged into the carbonization chamber and the inclination angle of the charged coal A surface shape measuring step for measuring the coal surface shape comprising:
The amount of coal charged into the carbonization chamber is determined from the shape of the coal surface measured by the surface shape measurement step and the surface shape of the coal charged into the carbonization chamber measured from the interval between the charging holes. An estimated charge estimation step;
A coke oven carbonization chamber characterized by having a charging amount adjustment step of adjusting the charging amount of coal into the next carbonization chamber based on the charging amount estimated by the charging amount estimation step. Coal charge control method.
[2] In the above [1], the charging amount adjustment step adjusts the charging amount of coal into the next carbonization chamber,
Coke oven characterized by adjusting leveling frequency and / or leveling speed of leveler in leveling process of next carbonization chamber based on shape of coal surface measured by surface shape measuring process A method for controlling the amount of coal charged into the carbonization chamber.

本発明によれば、簡易な方法により、コークス炉における炭化室への石炭の効率的な装入が可能なコークス炉炭化室への石炭の装入量制御方法が提供される。   ADVANTAGE OF THE INVENTION According to this invention, the charging amount control method of the coal to the coke oven carbonization chamber in which the efficient charging of the coal to the carbonization chamber in a coke oven is possible by a simple method is provided.

以下、本発明を実施するための最良の形態の一例を説明する。   Hereinafter, an example of the best mode for carrying out the present invention will be described.

本発明に係るコークス炉炭化室への石炭の装入量制御方法は、炭化室へ石炭を装入した後、該装入した石炭の上層部をレベラーにより均しを行う均し工程と、該均し工程後の石炭表面形状の計測を行う表面形状計測工程と、該表面形状計測工程により計測された石炭表面の形状から炭化室に装入された石炭の装入量を推定する装入量推定工程と、該装入量推定工程により推定された装入量に基づいて、次の炭化室への石炭の装入量を調整する装入量調整工程とを有するものである。   The method for controlling the amount of coal charged into the coke oven carbonization chamber according to the present invention comprises the step of leveling the upper layer of the charged coal with a leveler after charging the coal into the carbonization chamber, A surface shape measuring step for measuring the coal surface shape after the leveling step, and a charging amount for estimating the charging amount of the coal charged into the carbonization chamber from the shape of the coal surface measured by the surface shape measuring step An estimation step and a charging amount adjustment step of adjusting the charging amount of coal into the next carbonization chamber based on the charging amount estimated by the charging amount estimation step.

以下、前記各工程について説明する。   Hereinafter, each process will be described.

［均し工程］
本工程は、炭化室へ石炭を装入した後、該装入した石炭の上層部にレベラーを１回又は複数回通すことにより均しを行うものである。 [Leveling process]
In this step, after coal is charged into the carbonization chamber, leveling is performed once or a plurality of times through the upper layer of the charged coal.

図１は、本均し工程における石炭上層部の様子を示した図であり、（ａ）は炭化室１へ石炭２を装入した直後、（ｂ）はレベラー３による均しを行っている途中、（ｃ）はレベラー３による均しを行った後、の様子を示す。レベラー３により均しを行うことで、石炭２の上層部はある程度平坦化されるが、山谷を完全に無くすことは困難である。   FIG. 1 is a diagram showing a state of the upper layer of coal in the main leveling process, (a) immediately after charging coal 2 into the carbonization chamber 1, and (b) leveling by the leveler 3. In the middle, (c) shows the state after leveling by the leveler 3. By leveling with the leveler 3, the upper layer of the coal 2 is flattened to some extent, but it is difficult to completely eliminate the peaks and valleys.

［表面形状計測工程］
本工程は、前記均し工程後の石炭の表面形状の計測を行うものであり、その方法は種々取り得るが代表的な方法として、炭化室に装入された石炭の最上面の高さ位置、及び、装入された石炭の傾斜角度を計測することで、炭化室に装入された石炭の表面形状の計測を行う方法を、本発明者らが考案した。 [Surface shape measurement process]
This step is to measure the surface shape of the coal after the leveling step, and various methods can be used, but as a representative method, the height position of the top surface of the coal charged in the carbonization chamber The present inventors have devised a method of measuring the surface shape of the coal charged in the carbonization chamber by measuring the inclination angle of the charged coal.

図２は、石炭２の表面形状の計測方法の一例を説明するための説明図である。本工程では、図中（イ）で示すように、まず、炭化室１の炉頂に設けられた石炭の装入孔４から、石炭２上面の高さを計測することができる道具、例えば、棒状の計測器５を鉛直方向に下ろして装入孔４直下の石炭２上面の高さ、つまり、炭化室に装入された石炭の最上面の高さ位置を計測する。次に、前記棒状の計測器５を、図中（ロ）で示すように、炭化室の装入孔４の上端端部Ａ及び下端端部Ｂに接するように炭化室１内に挿入し、棒状の計測器５の先端部が石炭２の傾斜部上面に到達するまで挿入する。   FIG. 2 is an explanatory diagram for explaining an example of a method for measuring the surface shape of the coal 2. In this step, as shown by (a) in the figure, first, a tool that can measure the height of the upper surface of the coal 2 from the coal charging hole 4 provided at the top of the furnace of the carbonization chamber 1, for example, The rod-shaped measuring instrument 5 is lowered in the vertical direction, and the height of the upper surface of the coal 2 immediately below the charging hole 4, that is, the height position of the uppermost surface of the coal charged in the carbonization chamber is measured. Next, the rod-shaped measuring instrument 5 is inserted into the carbonization chamber 1 so as to contact the upper end A and the lower end B of the charging hole 4 of the carbonization chamber, as shown in FIG. Insert until the tip of the rod-shaped measuring instrument 5 reaches the upper surface of the inclined portion of the coal 2.

この時の、前記（イ）による鉛直方向の石炭表面の高さ、前記（ロ）による石炭２斜面部上面の高さ、及び、炭化室１に設けられた石炭装入孔４の構造から一義的に求まる前記（ロ）の状態における前記棒状の計測器５の角度θ1から、炭化室１内の石炭２の傾斜角度θ2は算出可能である。さらに、炭化室１の炉頂に複数設けられた石炭の装入孔４の間隔から、炭化室１内に装入された石炭２の表面形状が計測可能となる。 At this time, the height of the coal surface in the vertical direction according to (A), the height of the upper surface of the slope of the coal 2 due to (B), and the structure of the coal charging hole 4 provided in the carbonization chamber 1 are unambiguous. The inclination angle θ 2 of the coal 2 in the coking chamber 1 can be calculated from the angle θ 1 of the rod-shaped measuring instrument 5 in the state (b) obtained in the above. Furthermore, the surface shape of the coal 2 charged in the carbonization chamber 1 can be measured from the interval between the coal charging holes 4 provided at the top of the furnace of the carbonization chamber 1.

なお、前記の例においては、石炭２の表面形状を計測する際に、棒状の計測器５を用いて鉛直方向の石炭２表面の高さ、及び、石炭２斜面部上面の高さを計測したが、この方法に限定されるものではなく、他の方法として、例えば、非接触のレーザ距離計等を用いての高さ計測も可能である。   In the above example, when the surface shape of the coal 2 is measured, the height of the surface of the coal 2 in the vertical direction and the height of the upper surface of the slope of the coal 2 are measured using the rod-shaped measuring device 5. However, the present invention is not limited to this method, and as another method, for example, height measurement using a non-contact laser distance meter or the like is possible.

［装入量推定工程］
本工程は、前記表面形状計測工程により計測された石炭表面の形状から炭化室１に装入された石炭の装入量を推定するものである。 [Charge estimation process]
In this step, the amount of coal charged in the carbonization chamber 1 is estimated from the shape of the coal surface measured in the surface shape measurement step.

炭化室１の形状等は、設計データより予め求めることができるので、前記表面形状計測工程で計測された、石炭表面の形状及び高さより、炭化室１内に装入された石炭の装入量を推定することができる。   Since the shape and the like of the carbonization chamber 1 can be obtained in advance from the design data, the amount of coal charged in the carbonization chamber 1 based on the shape and height of the coal surface measured in the surface shape measurement step. Can be estimated.

［装入量調整工程］
本工程は、前記装入量推定工程により推定された装入量に基づいて、次の炭化室への石炭の装入量を調整するものである。 [Loading amount adjustment process]
In this step, the charging amount of coal into the next carbonization chamber is adjusted based on the charging amount estimated in the charging amount estimation step.

本工程では、前記装入量推定工程により推定された石炭装入量と、炭化室１における適切な石炭装入量との比較を行う。比較を行った結果、前記装入量推定工程により推定された石炭装入量が、前記適切な石炭装入量より少ない場合には、次の炭化室への石炭の装入量を増やすような調整を行う。ここで、前記の増やす量としては、前記適切な石炭装入量と前記装入量推定工程により推定された石炭装入量との単純な差としてもよく、また、前記差に装入する石炭の水分、粒度などの情報等を考慮して、所定の係数をかけた値としてもよい。   In this process, a comparison is made between the coal charge estimated in the charge estimation process and an appropriate coal charge in the carbonization chamber 1. As a result of comparison, if the coal charge estimated in the charge amount estimation step is less than the appropriate coal charge amount, the amount of coal charged into the next carbonization chamber is increased. Make adjustments. Here, the amount to be increased may be a simple difference between the appropriate coal charge amount and the coal charge amount estimated by the charge amount estimation step, and the coal charged to the difference may be the same. In consideration of information such as moisture and particle size, a value multiplied by a predetermined coefficient may be used.

また、前記装入量推定工程により推定された石炭装入量が、前記適切な石炭装入量より多い場合には、次の炭化室への石炭の装入量を減らすような調整を行う。ここで、前記減らす量としては、前記増やす場合と同様に、前記適切な石炭装入量と前記装入量推定工程により推定された石炭装入量との単純な差としてもよく、また、前記差に装入する石炭の水分、粒度などの情報等を考慮して、所定の係数をかけた値としてもよい。   Moreover, when the coal charge estimated by the said charge estimation process is more than the said suitable coal charge, it adjusts so that the charge of the coal to the next carbonization chamber may be reduced. Here, the amount to be reduced may be a simple difference between the appropriate coal charge amount and the coal charge amount estimated by the charge amount estimation step, as in the case of the increase. It is good also as a value which multiplied the predetermined coefficient in consideration of information, such as the moisture of a coal inserted into a difference, and a particle size.

ここで、前記装入量調整工程により、次の炭化室への石炭の装入量を調整する際には、前記装入量を調整すると共に、前記表面形状計測工程により計測された石炭表面の形状に基づいて、次の炭化室の均し工程でのレベラーによる均し回数及び／又はレベラーの均し速度の調整を行ってもよい。   Here, when adjusting the charging amount of coal into the next carbonization chamber by the charging amount adjusting step, the charging amount is adjusted and the surface of the coal surface measured by the surface shape measuring step is adjusted. Based on the shape, the number of leveling by the leveler and / or the leveling speed of the leveler in the next carbonizing chamber leveling step may be adjusted.

前記表面形状計測工程で計測した炭化室１内の石炭表面の形状、例えば、石炭の傾斜角度θ2が所定の角度、例えば、３０°以上の場合には、前記均し工程でのレベラーによる１回の均しでは、石炭の平坦化が不十分であると判断できる。炭化室１内での石炭の上面位置には、乾留を十分に行うための上限の位置があり、平坦化が不十分であると、石炭最上面の位置をその上限の位置以下とした場合に、炭化室１内での無駄な空間が多くなり、効率的な操業を損なう場合がある。そこで、前記表面形状計測工程で計測した炭化室１内の石炭の傾斜角度θ2が所定の角度以上の場合に、次の炭化室の均し工程でのレベラーによる均し回数及び／又はレベラーの均し速度の調整を行うことで、炭化室１内に装入された石炭の平坦化をより促進することが可能となり、その結果、石炭の装入量をより適切な量に調整でき、より効率的な操業が可能となる。 When the shape of the coal surface in the carbonization chamber 1 measured in the surface shape measuring step, for example, the inclination angle θ 2 of the coal is a predetermined angle, for example, 30 ° or more, the leveler 1 in the leveling step 1 It can be judged that the leveling of the coal is insufficient for leveling the coal. The upper surface position of the coal in the carbonization chamber 1 has an upper limit position for sufficient dry distillation, and if the flattening is insufficient, the position of the uppermost surface of the coal is less than the upper limit position. In addition, the useless space in the carbonization chamber 1 is increased, which may impair efficient operation. Therefore, when the inclination angle θ 2 of the coal in the carbonization chamber 1 measured in the surface shape measurement step is equal to or larger than a predetermined angle, the number of leveling by the leveler in the next carbonization chamber leveling step and / or the leveler By adjusting the leveling speed, it becomes possible to further promote the flattening of the coal charged into the carbonizing chamber 1, and as a result, the amount of coal charged can be adjusted to a more appropriate amount, Efficient operation is possible.

なお、前記次の炭化室の均し工程におけるレベラーによる均し回数としては、前回の均し工程における均し回数より多い回数、例えば、２回又はそれ以上とすることができ、又、レベラーの均し速度としては、例えば、通常の速度と比較して速度を遅くする調整を行うことができる。前記調整を行うことにより、炭化室１内に装入された石炭の上層部をより平坦化することができ、炭化室１内に装入される石炭量をより適切な量に管理することが可能となり、その結果、より効率的な操業が可能となる。   In addition, the number of times of leveling by the leveler in the leveling step of the next carbonization chamber can be set to a number greater than the number of times of leveling in the previous leveling step, for example, 2 times or more. As the leveling speed, for example, it is possible to adjust the speed to be slower than the normal speed. By performing the adjustment, the upper layer portion of the coal charged in the carbonization chamber 1 can be flattened, and the amount of coal charged in the carbonization chamber 1 can be managed to a more appropriate amount. As a result, more efficient operation is possible.

本発明に係る均し工程における石炭上層部の様子を示した図であり、（ａ）は炭化室１へ石炭２を装入した直後、（ｂ）はレベラーによる均しを行っている途中、（ｃ）はレベラーによる均しを行った後、の様子を示す図である。It is the figure which showed the mode of the coal upper layer part in the leveling process which concerns on this invention, (a) is immediately after charging coal 2 into the carbonization chamber 1, (b) is in the middle of leveling by a leveler, (C) is a figure which shows the mode after performing leveling by a leveler. 本発明に係る石炭の表面形状の計測方法の一例を説明するための説明図である。It is explanatory drawing for demonstrating an example of the measuring method of the surface shape of the coal which concerns on this invention. 従来方法に係る石炭の装入量の計測方法の一例を説明するための説明図である。It is explanatory drawing for demonstrating an example of the measuring method of the charging amount of the coal which concerns on the conventional method.

符号の説明Explanation of symbols

１ 炭化室
２ 石炭
３ レベラー
４ 装入孔
５ 棒状の計測器 1 Coking chamber 2 Coal 3 Leveler 4 Filling hole 5 Bar-shaped measuring instrument

Claims (2)

炭化室へ石炭を装入した後、該装入した石炭の上層部をレベラーにより均しを行う均し工程と、
該均し工程後の炭化室の炉頂に複数設けられた石炭の装入孔毎に、炭化室に装入された石炭の最上面の高さ位置、及び、装入された石炭の傾斜角度からなる石炭表面形状の計測を行う表面形状計測工程と、
該表面形状計測工程により計測された石炭表面の形状と、装入孔の間隔から計測された炭化室内に装入された石炭の表面形状とから炭化室に装入された石炭の装入量を推定する装入量推定工程と、
該装入量推定工程により推定された装入量に基づいて、次の炭化室への石炭の装入量を調整する装入量調整工程と
を有することを特徴とするコークス炉炭化室への石炭の装入量制御方法。 Leveling step of leveling the upper layer of the charged coal with a leveler after charging the coal into the carbonization chamber;
For each coal charging hole provided at the top of the carbonization chamber furnace after the leveling step, the height position of the uppermost surface of the coal charged into the carbonization chamber and the inclination angle of the charged coal A surface shape measuring step for measuring the coal surface shape comprising:
The amount of coal charged into the carbonization chamber is determined from the shape of the coal surface measured by the surface shape measurement step and the surface shape of the coal charged into the carbonization chamber measured from the interval between the charging holes. An estimated charge estimation step;
A coke oven carbonization chamber characterized by having a charging amount adjustment step of adjusting the charging amount of coal into the next carbonization chamber based on the charging amount estimated by the charging amount estimation step. Coal charge control method. 装入量調整工程により、次の炭化室への石炭の装入量を調整すると共に、
表面形状計測工程により計測された石炭表面の形状に基づいて、次の炭化室の均し工程でのレベラーによる均し回数及び／又はレベラーの均し速度の調整を行うことを特徴とする請求項１に記載のコークス炉炭化室への石炭の装入量制御方法。 While adjusting the amount of coal charged into the next carbonization chamber by the amount adjustment process,
The number of leveling by the leveler and / or the leveling speed of the leveler is adjusted based on the shape of the coal surface measured in the surface shape measuring step. The method for controlling the amount of coal charged into the coke oven carbonization chamber according to claim 1.
JP2004085920A 2004-03-24 2004-03-24 Coal charge control method for coke oven carbonization chamber Expired - Fee Related JP4379172B2 (en)

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