JP3849286B2 - Coke coking coal pretreatment method - Google Patents
Coke coking coal pretreatment method Download PDFInfo
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- JP3849286B2 JP3849286B2 JP04537098A JP4537098A JP3849286B2 JP 3849286 B2 JP3849286 B2 JP 3849286B2 JP 04537098 A JP04537098 A JP 04537098A JP 4537098 A JP4537098 A JP 4537098A JP 3849286 B2 JP3849286 B2 JP 3849286B2
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Description
【0001】
【発明の属する技術分野】
本発明は、冶金用コークスとくに高炉用コークスの製造に用いる原料炭の前処理方法に関し、とりわけ、コークス用原料炭を室炉式コークス炉に装入するための前処理方法にかかわるものである。
【0002】
【従来の技術】
冶金用コークスとくに高炉用コークスを製造する最近の技術では、乾留時間の短縮、あるいは高価な粘結炭の使用比率低減を目的として、コークス炉装入炭を予め乾燥して調湿したのちコークス炉内に装入する方法が採用されている。例えば、調湿炭装入プロセスと呼ばれている方法では、原料炭の水分は6%程度に調整されており、また予熱炭装入プロセスと呼ばれている方法では、水分が0%になるまで予熱乾燥されている。
【0003】
このように装入炭の水分を低減させる方法では、乾留時間の短縮による生産性の向上が可能となり、しかも、コークス炉内での原料炭の装入密度が増加することによるコークス強度の向上が見込めるため、一定のコークス強度を維持した状態ならば非微粘結炭の使用比率を上げられるという利点がある。
【0004】
しかしながら、このように装入炭が予め乾燥されると、この装入炭は、もともと水分にて凝集していた微粉が塊状体から分離するため、その微粉がコークス炉内に装入されるときに発塵する。このため、調湿炭装入プロセスでは、水分量の下限値を6%に制限している。一方、予熱炭装入プロセスでは、ダブルメインからの吸引などによって対応しているものの、副産物への発塵炭の混入、あるいは炉上部や上昇管等へのカーボン付着などの弊害があった。
【0005】
そこで、特開平9−48977 号公報等では、予熱炭装入プロセスに関し、原料炭を予熱乾燥した後に微粉炭と粗粒炭とに分級し、その微粉炭を熱間で塊成化してから、その塊成炭を予熱した前記粗粒炭と混合してコークス炉に装入する方法が提案されている。
しかしながら、この提案にかかる方法では、高温での微粉炭の塊成化条件は生産性や塊成炭の品質によって決定されるため、その条件が適正でないと微粉炭の発塵を防止できない場合があった。
【0006】
【発明が解決しようとする課題】
本発明の目的は、コークス用原料炭を発塵させることなく室炉式コークス炉内に装入するための前処理方法を提案することにある。
【0007】
【課題を解決するための手段】
上記目的を有利に実現できる技術として、本発明は、室炉式コークス炉に原料炭を装入してコークスを製造するにあたり、コークス炉装入までのハンドリング時に発塵する微粉の発生割合を表わす、下記の定義に係るI型強度との関連において、粘結炭の使用比率を40%以上とし、その粘結炭を含む原料炭を予め流動層にて乾燥分級し、次いで、分級後の粗粉炭と微粉炭を300〜400℃の温度に予熱し、その後、前記微粉炭をロール型塊成機にてロール圧力3t/cm以上で塊成化して、容積 34cc 以下、嵩密度1.12g/cm3以上の塊成炭としたのち、予熱した前記粗粉炭と混合することにより、I型強度が 70 以上の原料炭にすることを特徴とするコークス用原料炭の前処理方法。
記:I型強度とは、塊成炭成品 200g を長さ 700mm 、直径 130.8mm の円筒にいれ、 60 回転させた後の、 1mm 以上の粉の重量割合である。
【0008】
【発明の実施の形態】
本発明にかかるコークス用原料炭の前処理方法では、必要な塊成炭強度を得るために、乾燥分級後の微粉炭中にも粘結炭が混入されていることが必要であり、それ故に粘結炭を40%以上含む原料炭を使用する(図2参照)。
【0009】
この原料炭の乾燥は、効率面から、乾燥と同時に微粉炭を分級できる流動層型の乾燥機を用いて行われる。特に本発明では、塊成炭の強度を高くするために、乾燥分級後の原料炭を 300℃以上 400℃以下に予熱する。この理由は、原料炭の予熱温度を高くすればするほどその塊成炭の強度は高くなるが、 400℃を超えると石炭の粘着性が現れ輪送過程で閉塞等のトラブルが生じる。一方 300℃未満では必要とする塊成炭の強度が得られないからである(図3参照)。
【0010】
本発明における微粉炭の塊成化では、生産性を考慮して、ロール型の塊成機を使用する。
このロール型塊成機を用いて塊成した塊成炭の形状は、とくに限定するものではなく、例えば、ピーロー型やマセック型、アーモンド型などとすることができる。このような形状の塊成炭は、少なくとも嵩密度を1.12g/cm3 以上として、図4に示すように、I型強度を確保する必要がある。なお、塊成炭の容積が大きくなると、塊成炭の厚みが大きくなって塊成時のロール圧力が塊成炭の内部にまで伝わりにくくなるため嵩密度が低下し、その強度が低下する。それ故に、本発明では、塊成炭の容積を34cc以下とすることが望ましい(図6参照)。
また、塊成時のロール圧力は、高いほど塊成炭強度が向上するが、塊成炭の嵩密度を1.12g/cm3 以上に維持するために3t/cm以上とした(図5参照)。なお、本発明におけるロール圧力とは、ロール軸方向での幅当りの線圧を意味する。
【0011】
【実施例】
以下、本発明を図1に基づいて説明する。この図1は、コークスを製造する代表的なフローを示す図である。
この図において、室炉式コークス炉に原料炭を装入してコークスを製造するにあたり、まず、粘結炭を所定の割合で含む原料炭が、熱風を用いた流動床型の乾燥機に装入される。このとき、微粉炭は、熱風とともに排出されてバグフィルター等で補集され、粗粉炭と分級される。次いで、分級された粗粉炭と微粉炭は、それぞれ熱風を用いた気流搬送型予熱機に装入されて所定の温度に予熱される。その後、微粉炭は、所定の圧力に調整したロール型の熱間塊成機に装入されて所定の容積を有する塊成炭となり、予熱された粗粉炭と混炭機で混合されてからコークス炉に装入される。
【0012】
このようにしてコークスを製造するに当たり、所定の条件にて調製した塊成炭について、コークス炉装入までのハンドリング時に発塵に寄与する微粉の発生度合いを表わす指標として、I型強度を測定した。その結果を図2〜図6に示す。なお、このI型強度は、塊成炭成品 200gを長さ 700mm, 直径130.8mm の円筒にいれ、60回転後の1mm以上の粉の重量割合で評価した。ここで、従来の知見による発塵の許容値は、このI型強度で70程度である。
【0013】
図2は、原料炭中に含まれる粘結炭の割合を変化させて調製した塊成炭について、その粘結炭使用比率とI型強度の関係を示すグラフである。このとき、原料炭の予熱温度は 300℃、ロール圧力は3t/cmとして塊成炭の嵩密度を1.12g/cm3 とした。
この図から明らかなように、粘結炭使用比率は、40%以上でI型強度の許容値を満足し得ることがわかる。
【0014】
図3は、原料炭の予熱温度を変化させて調製した塊成炭について、その予熱温度とI型強度の関係を示すグラフである。このとき、粘結炭使用比率は40%、ロール圧力は3t/cmとして塊成炭の嵩密度を1.12g/cm3 とした。
この図から明らかなように、熱間塊成時の原料炭の予熱温度は、 300℃以上でI型強度の許容値を満足し得ることがわかる。
【0015】
図4は、嵩密度を変化させて調製した塊成炭について、その塊成炭の嵩密度とI型強度の関係を示すグラフである。このとき、粘結炭使用比率は40%、原料炭の予熱温度は300 ℃、ロール圧力は3t/cmとした。
この図から明らかなように、塊成炭の嵩密度は、1.12g/cm3 以上でI型強度の許容値を満足し得ることがわかる。
【0016】
図5は、ロール圧力を変化させて調製した塊成炭について、そのロール圧力とI型強度の関係を示すグラフである。このとき、粘結炭使用比率は40%、原料炭の予熱温度は300 ℃、塊成炭の嵩密度は1.12g/cm3 とした。
この図から明らかなように、ロール圧力は、3t/cm以上でI型強度の許容値を満足し得ることがわかる。
【0017】
図6は、塊成炭容積を変化させて調製した塊成炭について、その塊成炭容積とI型強度の関係を示すグラフである。このとき、粘結炭使用比率は40%、原料炭の予熱温度は300 ℃、ロール圧力は3t/cmとして塊成炭の嵩密度を1.12g/cm3 とした。
この図から明らかなように、塊成炭容積は、34cc以下でI型強度の許容値を満足し得ることがわかる。
【0018】
【発明の効果】
以上説明したように本発明の前処理方法によれば、発塵に寄与する微粉の発生度合いが極めて少ない塊成炭を調製することができ、その結果、乾燥した予熱炭を発塵させることなくコークス炉内に装入することができる。
【図面の簡単な説明】
【図1】コークスを製造する代表的なフローを示す図である。
【図2】原料炭中に含まれる粘結炭の使用比率とI型強度の関係を示すグラフである。
【図3】原料炭の予熱温度とI型強度の関係を示すグラフである。
【図4】塊成炭の嵩密度とI型強度の関係を示すグラフである。
【図5】ロール型塊成機のロール圧力とI型強度の関係を示すグラフである。
【図6】塊成炭容積とI型強度の関係を示すグラフである。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a pretreatment method for raw coal used in the production of metallurgical coke, particularly blast furnace coke, and more particularly to a pretreatment method for charging coke raw coal into a chamber-type coke oven.
[0002]
[Prior art]
In the recent technology for producing metallurgical coke, especially blast furnace coke, the coke oven furnace is pre-dried and conditioned for the purpose of shortening the carbonization time or reducing the proportion of expensive caking coal. The method of charging inside is adopted. For example, in the method called the humidity control coal charging process, the moisture of the raw coal is adjusted to about 6%, and in the method called the preheating coal charging process, the moisture becomes 0%. Until preheated.
[0003]
In this way, the method of reducing the water content of the charged coal enables an improvement in productivity by shortening the carbonization time, and also increases the coke strength by increasing the charging density of the raw coal in the coke oven. Since it is expected, there is an advantage that the use ratio of non-slightly caking coal can be increased if a certain coke strength is maintained.
[0004]
However, when the charging coal is previously dried in this way, the charging coal separates from the lump of the fine powder that was originally agglomerated with moisture, so when the fine powder is charged into the coke oven. Generate dust. For this reason, in the humidity control charcoal charging process, the lower limit of the amount of water is limited to 6%. On the other hand, in the preheating coal charging process, although it is dealt with by suction from the double main, there are problems such as dust coal mixing into by-products or carbon adhesion to the furnace top or riser.
[0005]
Therefore, in JP-A-9-48977 and the like, regarding the preheating coal charging process, after the raw coal is preheated and dried, it is classified into pulverized coal and coarse coal, and the pulverized coal is agglomerated hot, A method has been proposed in which the agglomerated coal is mixed with the pre-heated coarse coal and charged into a coke oven.
However, in the method according to this proposal, the agglomeration conditions of the pulverized coal at high temperatures are determined by the productivity and the quality of the agglomerated coal. Therefore, if the conditions are not appropriate, dust generation of the pulverized coal may not be prevented. there were.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to propose a pretreatment method for charging coke coking coal into a chamber coke oven without generating dust.
[0007]
[Means for Solving the Problems]
As a technique that can advantageously realize the above object, the present invention represents the generation rate of fine powder generated during handling up to the charging of the coke oven when charging coke into the chamber coke oven. In connection with the type I strength according to the following definition , the caking coal is used at a ratio of 40% or more, and the raw coal containing the caking coal is dried and classified in a fluidized bed in advance, and then the coarse after classification. the coal and pulverized coal is preheated to a temperature of 300 to 400 ° C., then, the pulverized coal to be agglomerated with a roll-type by agglomerates mill roll pressure 3t / cm or more, volume 34cc or less, a bulk density of 1.12 g / cm A pretreatment method for coking coal for coke, characterized in that it is made into coking coal having an I-type strength of 70 or more by mixing with pre-heated coarse coal after forming 3 or more agglomerated coal.
Note: Type I strength is the weight ratio of powder of 1 mm or more after 200 g of agglomerated charcoal product is put in a cylinder with a length of 700 mm and a diameter of 130.8 mm and rotated 60 times.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
In the pretreatment method of coking coal for coke according to the present invention, it is necessary that caking coal be mixed in the pulverized coal after dry classification in order to obtain the necessary agglomerated coal strength, and therefore Coking coal containing 40% or more of caking coal is used (see Fig. 2).
[0009]
From the viewpoint of efficiency, the raw coal is dried using a fluidized bed dryer that can classify pulverized coal simultaneously with drying. Particularly in the present invention, in order to increase the strength of the agglomerated coal, the raw coal after the dry classification is preheated to 300 ° C. or higher and 400 ° C. or lower. The reason for this is that the higher the preheating temperature of the coking coal, the higher the strength of the agglomerated coal. However, when the temperature exceeds 400 ° C, the stickiness of the coal appears and troubles such as clogging occur during the feeding process. On the other hand, if it is less than 300 ° C, the required agglomerate strength cannot be obtained (see Fig. 3).
[0010]
In the agglomeration of pulverized coal in the present invention, a roll-type agglomerator is used in consideration of productivity.
The shape of the agglomerated coal agglomerated using this roll-type agglomerator is not particularly limited, and may be, for example, a pillow type, a Macek type, or an almond type. The agglomerated coal having such a shape needs to have at least a bulk density of 1.12 g / cm 3 or more and ensure the I-type strength as shown in FIG. When the volume of the agglomerated coal increases, the thickness of the agglomerated coal increases, and the roll pressure at the time of agglomeration becomes difficult to be transmitted to the inside of the agglomerated coal, so the bulk density decreases and the strength decreases. Therefore, in the present invention, it is desirable that the volume of the agglomerated coal be 34 cc or less (see FIG. 6).
The higher the roll pressure during agglomeration, the higher the agglomerate strength. However, in order to maintain the bulk density of the agglomerated coal at 1.12 g / cm 3 or more, the roll pressure is set to 3 t / cm or more (see FIG. 5). . The roll pressure in the present invention means a linear pressure per width in the roll axis direction.
[0011]
【Example】
Hereinafter, the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a typical flow for producing coke.
In this figure, when producing coke by charging coking coal into a chamber-type coke oven, first, coking coal containing caking coal in a predetermined ratio is loaded into a fluidized bed dryer using hot air. Entered. At this time, the pulverized coal is discharged together with hot air, collected by a bag filter or the like, and classified as coarse pulverized coal. Next, the classified coarse pulverized coal and pulverized coal are charged into an air-flow conveying preheater using hot air, respectively, and preheated to a predetermined temperature. After that, the pulverized coal is charged into a roll-type hot agglomerator adjusted to a predetermined pressure to become agglomerated coal having a predetermined volume, mixed with preheated coarse pulverized coal and a coke oven, and then coke oven. Is charged.
[0012]
In producing coke in this way, type I strength was measured as an index representing the degree of generation of fine powder contributing to dust generation during handling up to the coke oven charging for the agglomerated coal prepared under predetermined conditions. . The results are shown in FIGS. In addition, this type I strength was evaluated based on the weight ratio of powder of 1 mm or more after 60 rotations by putting 200 g of agglomerated coal products into a cylinder 700 mm long and 130.8 mm in diameter. Here, the allowable value of dust generation according to conventional knowledge is about 70 in this I-type strength.
[0013]
FIG. 2 is a graph showing the relationship between the caking coal use ratio and the I-type strength of agglomerated coal prepared by changing the proportion of caking coal contained in the raw coal. At this time, the preheating temperature of the raw coal was 300 ° C., the roll pressure was 3 t / cm, and the bulk density of the agglomerated coal was 1.12 g / cm 3 .
As is apparent from this figure, it can be seen that the caking coal use ratio is 40% or more and the allowable value of type I strength can be satisfied.
[0014]
FIG. 3 is a graph showing the relationship between the preheating temperature and the I-type strength of the agglomerated coal prepared by changing the preheating temperature of the raw coal. At this time, the caking coal use ratio was 40%, the roll pressure was 3 t / cm, and the bulk density of the agglomerated coal was 1.12 g / cm 3 .
As is apparent from this figure, the preheating temperature of the raw coal during hot agglomeration can satisfy the allowable value of I-type strength at 300 ° C or higher.
[0015]
FIG. 4 is a graph showing the relationship between bulk density and I-type strength of agglomerated coal prepared by changing the bulk density. At this time, the caking coal use ratio was 40%, the preheating temperature of the raw coal was 300 ° C., and the roll pressure was 3 t / cm.
As is apparent from this figure, it can be seen that the bulk density of the agglomerated coal can satisfy the allowable value of I-type strength at 1.12 g / cm 3 or more.
[0016]
FIG. 5 is a graph showing the relationship between roll pressure and type I strength for agglomerated coal prepared by changing the roll pressure. At this time, the caking coal use ratio was 40%, the preheating temperature of the raw coal was 300 ° C., and the bulk density of the agglomerated coal was 1.12 g / cm 3 .
As is apparent from this figure, it can be seen that the roll pressure can satisfy the allowable value of the I-type strength at 3 t / cm or more.
[0017]
FIG. 6 is a graph showing the relationship between agglomerated coal volume and I-type strength for agglomerated coal prepared by changing the agglomerated coal volume. At this time, the caking coal use ratio was 40%, the preheating temperature of the raw coal was 300 ° C., the roll pressure was 3 t / cm, and the bulk density of the agglomerated coal was 1.12 g / cm 3 .
As is apparent from this figure, it can be seen that the agglomerated coal volume can satisfy the allowable value of type I strength at 34 cc or less.
[0018]
【The invention's effect】
As described above, according to the pretreatment method of the present invention, it is possible to prepare agglomerated coal with a very small generation degree of fine powder that contributes to dusting, and as a result, without generating dust from dried preheated coal. Can be charged into coke oven.
[Brief description of the drawings]
FIG. 1 is a diagram showing a typical flow for producing coke.
FIG. 2 is a graph showing the relationship between the use ratio of caking coal contained in coking coal and type I strength.
FIG. 3 is a graph showing the relationship between the preheating temperature of coking coal and the I-type strength.
FIG. 4 is a graph showing the relationship between bulk density and I-type strength of agglomerated coal.
FIG. 5 is a graph showing the relationship between roll pressure and type I strength of a roll type agglomerator.
FIG. 6 is a graph showing the relationship between agglomerated coal volume and type I strength.
Claims (1)
記:I型強度とは、塊成炭成品 200g を長さ 700mm 、直径 130.8mm の円筒にいれ、 60 回転させた後の、 1mm 以上の粉の重量割合である。 In the production of coke by charging coking coal into the chamber-type coke oven, in relation to the type I strength according to the following definition, which represents the generation rate of fine powder generated during handling up to the coke oven charging , The use ratio of caking coal is set to 40% or more , the raw coal containing the caking coal is dried and classified in a fluidized bed in advance, and then the coarse and pulverized coal after classification is preheated to a temperature of 300 to 400 ° C. , then the pulverized coal to be agglomerated with a roll pressure of 3t / cm or higher with a roll-type agglomerates machine, less volume 34Cc, After the bulk density of 1.12 g / cm 3 or more mass Narusumi, the crude preheated A pretreatment method for coking coal for coke, characterized in that by mixing with pulverized coal , raw coal with an I-type strength of 70 or more is obtained .
Note: Type I strength is the weight ratio of powder of 1 mm or more after 200 g of agglomerated charcoal product is put in a cylinder with a length of 700 mm and a diameter of 130.8 mm and rotated 60 times.
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JP04537098A JP3849286B2 (en) | 1998-02-26 | 1998-02-26 | Coke coking coal pretreatment method |
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JP04537098A JP3849286B2 (en) | 1998-02-26 | 1998-02-26 | Coke coking coal pretreatment method |
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JP3849286B2 true JP3849286B2 (en) | 2006-11-22 |
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JP4274880B2 (en) | 2003-09-11 | 2009-06-10 | 社団法人日本鉄鋼連盟 | Reforming and pretreatment methods for coking coal for blast furnace coke production |
JP4890200B2 (en) * | 2006-11-10 | 2012-03-07 | 新日本製鐵株式会社 | Manufacturing method of high strength coke |
JP4890231B2 (en) * | 2006-12-21 | 2012-03-07 | 新日本製鐵株式会社 | Start-up method of high-temperature coal treatment facility |
JP5741246B2 (en) * | 2011-06-24 | 2015-07-01 | 新日鐵住金株式会社 | Coke oven charging method and coke manufacturing method |
JP5719283B2 (en) * | 2011-12-01 | 2015-05-13 | 株式会社神戸製鋼所 | Production method of by-product coal molding |
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