JP5741246B2 - Coke oven charging method and coke manufacturing method - Google Patents

Coke oven charging method and coke manufacturing method Download PDF

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JP5741246B2
JP5741246B2 JP2011140515A JP2011140515A JP5741246B2 JP 5741246 B2 JP5741246 B2 JP 5741246B2 JP 2011140515 A JP2011140515 A JP 2011140515A JP 2011140515 A JP2011140515 A JP 2011140515A JP 5741246 B2 JP5741246 B2 JP 5741246B2
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窪田　征弘
征弘 窪田
野村　誠治
誠治 野村
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Nippon Steel Corp
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本発明は、コークス炉に装入されるコークス炉装入炭の製造方法などに関する。   The present invention relates to a method for producing a coke oven charging coal charged in a coke oven.

高炉用コークスに代表される各種コークスは、多数の銘柄の石炭（原料炭）を粉砕して配合した後、コークス炉に装入される。装入された配合炭は、炉内で乾留されることによりコークスとなる。コークス製造の際に特に重要とされる品質管理項目として、コークス強度が知られている。コークス強度は、石炭の配合条件が同じであっても、粉砕後の石炭の粒度に左右される。   Various cokes such as blast furnace coke are pulverized and blended with many brands of coal (coking coal) and then charged into the coke oven. The charged coal mixture is coke by being carbonized in the furnace. Coke strength is known as a quality control item that is particularly important in the production of coke. The coke strength depends on the grain size of the pulverized coal even if the coal blending conditions are the same.

近年、原料炭を強粉砕することによりコークス強度が向上することが確認されている。特許文献１では、最大長さで１．５ｍｍ以上の粗大イナート組織の含有量が５〜７体積％の境界値を用いて、該含有量が境界値以上である高イナート含有炭を粒径３ｍｍ以下の累積％が８５質量％の粉砕粒度で強粉砕する技術が開示されている。   In recent years, it has been confirmed that coke strength is improved by pulverizing raw coal. In Patent Document 1, the content of coarse inert structure having a maximum length of 1.5 mm or more is used as a boundary value of 5 to 7% by volume, and a high inert coal having a content of more than the boundary value is set to a particle size of 3 mm. A technique for strongly pulverizing with the pulverized particle size of the following cumulative percentage of 85% by mass is disclosed.

従来、強粉砕された配合炭は粗粒炭と微粉炭とに分級され、分級された微粉炭は体積が１０ｃｃ以下のフレーク状に全て塊成化された後、粗粒炭とともにコークス炉に装入されていた。   Conventionally, the strongly pulverized blended coal is classified into coarse coal and pulverized coal, and the classified pulverized coal is all agglomerated into flakes with a volume of 10 cc or less and then loaded into the coke oven together with the coarse coal. It was entered.

特開２００８−２９７３８５号公報JP 2008-297385 A

しかしながら、従来の方法では、コークス炉に装入される装入炭の嵩密度が低下するため、生産性の低下を招いていた。   However, in the conventional method, since the bulk density of the charging coal charged in the coke oven is lowered, the productivity is lowered.

上記課題を解決するために、本願発明に係るコークス炉装入炭の製造方法は、（１）配合炭全体の粉砕粒度が粒径３ｍｍ以下の累積％が８５質量％以上となるように、前記配合炭を構成する各原料炭をそれぞれ個別の粉砕粒度で粉砕し、この粉砕後の前記配合炭を粗粒炭と微粉炭とに分級し、この分級された微粉炭を塊成化することにより、塊成炭と前記粗粒炭とからなるコークス炉装入用の装入炭を製造するコークス炉装入炭の製造方法において、前記塊成炭は、第１の塊成機で塊成化された体積が１０ｃｃ以下の第１の塊成炭と、第２の塊成機で塊成化された体積が１０ｃｃよりも大きく３０ｃｃ以下の第２の塊成炭とからなり、前記微粉炭のうち前記第２の塊成炭の製造に振り向ける前記微粉炭の比率が高くなる程、コークス炉に装入される装入炭の嵩密度が増加する相関特性に基づき、前記嵩密度が目標の嵩密度を満足するように前記比率を調整することを特徴とする。
In order to solve the above-mentioned problems, the method for producing a coke oven charging coal according to the present invention is as follows: (1) The pulverized particle size of the entire blended coal is such that the cumulative% of the particle size of 3 mm or less is 85% by mass or more. By pulverizing each raw coal composing the blended coal with individual pulverization particle size, classifying the blended coal after this pulverization into coarse coal and pulverized coal, and agglomerating the classified pulverized coal In the manufacturing method of the coke oven charging coal for manufacturing the charging coal for charging the coke oven composed of the agglomerated coal and the coarse coal, the agglomerated coal is agglomerated by a first agglomerator. a first mass Narusumi volume following 10cc that is, the volume which has been agglomerated with a second agglomerate machine consists largely 30cc following second mass Narusumi than 10cc, the pulverized coal Of which, the higher the proportion of the pulverized coal to be used for the production of the second agglomerated coal, the more charged into the coke oven. Based on the correlation characteristic bulk density of the instrumentation Nyusumi increases, the bulk density and adjusting the ratio to satisfy the bulk density of the target.

（２）上記（１）の構成において、前記配合炭は、前記原料炭として最大長さで１．５ｍｍ以上の粗大イナート組織の含有量が５〜７体積％の境界値を用いて、該含有量が境界値よりも高い高イナート含有炭を含んでもよい。前記高イナート含有炭は、「粒径３ｍｍ以下の累積％が９０質量％以上」の粉砕粒度で強粉砕することによりコークス強度が向上する。したがって、強粉砕によるコークス強度向上効果及び嵩密度が増加することによりコークス強度向上効果双方の効果を得ることができる。   (2) In the configuration of (1) above, the blended coal contains a boundary value of 5 to 7% by volume of a coarse inert structure having a maximum length of 1.5 mm or more as the raw coal. High inert coal may be included whose amount is higher than the boundary value. The high-inert-containing charcoal is improved in coke strength by strong pulverization with a pulverized particle size of “cumulative% of particle size of 3 mm or less is 90% by mass or more”. Therefore, both the coke strength improvement effect and the bulk density increase by strong pulverization can provide both the coke strength improvement effect.

（３）上記（１）又は（２）の構成において、前記第１の塊成炭は、フレーク状であってもよい。   (3) In the configuration of the above (1) or (2), the first agglomerated coal may have a flake shape.

（４）上記（１）〜（３）の構成において、前記第２の塊成炭は、ブリケット状であってもよい。   (4) In the configurations of (1) to (3) above, the second agglomerated coal may be in a briquette shape.

（５）上記（１）〜（４）のうちいずれか一つの製造方法により製造された装入炭をコークス炉で乾留することにより、コークスを製造することができる。   (5) Coke can be manufactured by dry-distilling the charging coal manufactured by any one manufacturing method among said (1)-(4) with a coke oven.

本発明によれば、コークス炉に装入される装入炭の嵩密度を増加させることができる。   According to the present invention, the bulk density of the charged coal charged into the coke oven can be increased.

コークス炉装入炭の製造方法の工程図である。It is process drawing of the manufacturing method of coke oven charging coal. ホッパーの断面図である。It is sectional drawing of a hopper.

図１を参照しながら、本実施形態に係るコークス炉装入炭の製造方法について詳細に説明する。図１は、コークス炉装入炭の製造方法の工程図である。矢印は工程順序を示している。まず、粉砕装置１１において複数銘柄の原料炭をそれぞれ個別の粉砕粒度で粉砕する。当該個別の粉砕粒度は、配合炭全体の粉砕粒度が「粒径３ｍｍ以下の累積％が８５％以上」を満足するような値に設定されていればよい。配合炭全体の粉砕粒度が「粒径３ｍｍ以下の累積％が８５％未満」の場合は、コークス炉に装入される装入炭の嵩密度が、コークスを製造できない値にまで低下しないため、本願発明では、配合炭全体の粉砕粒度が「粒径３ｍｍ以下の累積％が８５％以上」のものを対象としている。   With reference to FIG. 1, a method for manufacturing a coke oven charging coal according to the present embodiment will be described in detail. FIG. 1 is a process diagram of a method for producing coke oven charging coal. Arrows indicate the process order. First, a plurality of brands of raw coal are pulverized with individual pulverization particle sizes in the pulverizer 11. The individual pulverized particle size may be set to such a value that the pulverized particle size of the entire blended coal satisfies “cumulative percentage of particle size of 3 mm or less is 85% or more”. When the pulverized particle size of the entire blended coal is “the cumulative percentage of the particle size of 3 mm or less is less than 85%”, the bulk density of the charged coal charged into the coke oven does not decrease to a value at which coke cannot be produced. In the present invention, the pulverized particle size of the entire blended coal is intended to be “cumulative percentage of particle size of 3 mm or less is 85% or more”.

ここで、個別の原料炭として、粗大イナート組織の含有量が５〜７体積％の境界値を用いて、該含有量が境界値よりも高い高イナート含有炭を強粉砕することによりコークス強度の向上効果を享受できる。   Here, as an individual raw coal, by using a boundary value having a coarse inert structure content of 5 to 7% by volume, the high inert-containing coal whose content is higher than the boundary value is strongly pulverized to increase the coke strength. You can enjoy the improvement effect.

ちなみに、粗大イナート組織の含有量の境界値の設定の考え方については、以下の通りである。
コークス製造用に複数の銘柄の石炭を配合する際には、配合炭の粒度として、コークスを製造可能な粒度の範囲で設定される。従って、各銘柄の石炭の粉砕粒度や配合比率は、配合炭の粒度の設定値により制約される。 Incidentally, the concept of setting the boundary value of the content of the coarse inert structure is as follows.
When blending a plurality of brands of coal for coke production, the particle size of the blended coal is set within a range of particle sizes that allow the production of coke. Therefore, the pulverization particle size and blending ratio of each brand of coal are limited by the set value of the coal blend particle size.

従って、粗大イナート含有量が相対的に高い銘柄の石炭の配合割合が多い場合に、粗大イナート含有量が相対的に高い銘柄の石炭をすべて強粉砕してしまうと、配合炭の粒度が細かくなり過ぎて、設定した粒度に調整できないケースがある。この様な場合は、粗大イナート含有量の境界値を５〜７体積％の範囲の中で、高めの値に設定することで、配合炭を所望の設定粒度とすることができる。   Therefore, if the blending ratio of brand coal with relatively high coarse inert content is large, and if all the brand coal with relatively high coarse inert content is pulverized, the grain size of the blended coal will become finer. In some cases, the granularity cannot be adjusted to the set granularity. In such a case, by setting the boundary value of the coarse inert content to a higher value within the range of 5 to 7% by volume, the blended coal can have a desired set particle size.

一方、粗大イナート含有量が相対的に高い銘柄の石炭の配合割合が少ない場合には、逆に、粗大イナート含有量の境界値を５〜７体積％の範囲の中で、低めの値に設定することで、配合炭を所望の設定粒度とすることができる。   On the other hand, if the blending ratio of brand coal with relatively high coarse inert content is small, conversely, the boundary value of coarse inert content is set to a lower value within the range of 5-7% by volume. By doing, blended charcoal can be made into a desired set particle size.

以上の考え方に基き、粗大イナート組織の含有量の境界値を設定し、この境界値よりも高い高イナート含有炭は、粒径３ｍｍ以下の累積％が９０質量％以上の粉砕粒度で強粉砕することによりコークス強度が向上する。なお、原料炭を強粉砕することによりコークス強度が向上する技術は、特許文献１等の種々の先行技術文献に記載されているため、ここでは詳細を述べない。強粉砕された配合炭は、乾燥分級装置１２に装入される。   Based on the above concept, the boundary value of the content of coarse inert structure is set, and the high inert content coal higher than this boundary value is strongly pulverized with a pulverization particle size of 90% by mass or more with a cumulative particle size of 3 mm or less. As a result, the coke strength is improved. In addition, since the technique which improves coke intensity | strength by pulverizing raw material charcoal is described in various prior art documents, such as patent document 1, details are not described here. The strongly pulverized blended coal is charged into the drying classifier 12.

乾燥分級装置１２は、ガス室に導入されたガスを分散板を介して噴出させることにより乾燥分級室内の分散板状に流動層を形成し、石炭を乾燥させながら粗粒炭と微粉炭とに分級する。乾燥分級装置１２における分級点は、当業者の技術常識により適宜定めることができる。分級点は、特に規定されないが、通常は、０．３ｍｍ以上３ｍｍ以下で設定される。分級点を０．３ｍｍ未満に設定すると、粗粒炭中に０．３ｍｍ程度の細かい石炭が混入する。その結果、コークス炉装入時に細かい石炭が発塵し、炉内のカーボン付着やタール中の微粉炭混入などの原因になるため好ましくない。分級点を３ｍｍ超に設定すると、塊成炭の中に数ｍｍの粗い石炭がコークス炉搬送過程で破壊の基点となる。そのため、装入炭中の微粉炭の割合が増加し、コークス炉装入時に微粉が発塵して、炉内のカーボン付着やタール中の微粉炭混入などの原因になり好ましくない。
The dry classifier 12 forms a fluidized bed in the form of a dispersion plate in the dry classification chamber by ejecting the gas introduced into the gas chamber through the dispersion plate, and turns the coarse coal and pulverized coal into dry coal. Classify. The classification point in the drying classifier 12 can be appropriately determined according to the common general technical knowledge of those skilled in the art. The classification point is not particularly defined, but is usually set to 0.3 mm or more and 3 mm or less. When the classification point is set to less than 0.3 mm, fine coal of about 0.3 mm is mixed in the coarse coal. As a result, fine coal is generated when the coke oven is charged, and this is not preferable because it causes carbon adhesion in the furnace and mixing of pulverized coal in tar. When the classification point is set to more than 3 mm, coarse coal of several mm in the agglomerated coal becomes a base point for destruction in the coke oven conveyance process. Therefore, the ratio of the pulverized coal in the charging coal is increased, and the pulverized powder is generated at the time of charging into the coke oven. This is not preferable because it causes carbon adhesion in the furnace and contamination of pulverized coal in tar.

振り分け部１３は、微粉炭を第１の塊成機１４及び第２の塊成機１５に振り分ける。ここで、微粉炭の振り分け率は粉砕装置１１における粉砕粒度に基づき決定される。従来、配合炭を強粉砕することにより得られる微粉炭は、全て体積が１０ｃｃ以下の塊成炭（第１の塊成炭）に塊成化されていた。本発明者は、粉砕粒度が増加するのに応じてコークス炉内の装入炭の嵩密度が下がり、微粉炭の一部を体積が１０ｃｃよりも大きく、かつ、３０ｃｃ以下の塊成炭（第２の塊成炭）の製造に振り替える（以下、振替率という）ことにより、嵩密度が上昇することを発見した。これにより、石炭を強粉砕することによるコークス強度向上効果及び嵩密度が上昇することによるコークス強度向上効果双方の効果を得ることができる。   The distribution unit 13 distributes the pulverized coal to the first agglomerator 14 and the second agglomerator 15. Here, the distribution ratio of the pulverized coal is determined based on the pulverized particle size in the pulverizer 11. Conventionally, all of the pulverized coal obtained by strongly pulverizing blended coal has been agglomerated into agglomerated coal (first agglomerated coal) having a volume of 10 cc or less. As the pulverized particle size increases, the present inventor reduces the bulk density of the charged coal in the coke oven, and a part of the pulverized coal has a volume larger than 10 cc and an agglomerated coal (No. 1). It was discovered that the bulk density increases by switching to the production of 2 agglomerated coal (hereinafter referred to as the transfer rate). Thereby, both the effects of improving the coke strength by pulverizing coal and the effect of improving coke strength by increasing the bulk density can be obtained.

第１の塊成機１４は、振り分け部１３で振り分けられた微粉炭を塊成化して、体積が１０ｃｃ以下の第１の塊成炭を製造する。第１の塊成炭は、フレーク状、或いは平板状であってもよい。さらに、第１の塊成炭の最大長さは３０ｍｍ以下であることが好ましい。第２の塊成機１５は、振り分け部で振り分けられた微粉炭を塊成化して、体積が１０ｃｃよりも大きく、かつ、３０ｃｃ以下の第２の塊成炭を製造する。第２の塊成炭は、ブリケット状であり、マセック型、ピロー型、或いはプリズム型であってもよい。第１の塊成機１４及び第２の塊成機１５は、ダブルロール成型機等が例示できる。   The first agglomerator 14 agglomerates the pulverized coal distributed by the distribution unit 13 to produce a first agglomerated coal having a volume of 10 cc or less. The first agglomerated coal may be flaky or flat. Furthermore, the maximum length of the first agglomerated coal is preferably 30 mm or less. The second agglomerator 15 agglomerates the pulverized coal distributed by the distributing unit to produce a second agglomerated coal having a volume larger than 10 cc and 30 cc or less. The second agglomerated coal has a briquette shape, and may be a Macek type, a pillow type, or a prism type. Examples of the first agglomeration machine 14 and the second agglomeration machine 15 include a double roll molding machine.

粗粒炭、第１の塊成炭及び第２の塊成炭は石炭塔１６に搬送され、石炭塔１６に設けられたホッパーからコークス炉１７に装入される。ここで、塊成炭の体積が増すことにより、装入炭の粒度分布が広くなるため嵩密度は上昇するが、塊成炭の体積が大きくなりすぎると石炭塔内での粒度偏析が顕在化し、石炭塔の貯留レベルが変動した際、石炭塔から排出される装入炭の塊成物比率も変動する。そのため装入レベルの変動が大きくなり、結果的に装入量の低下を招く。そこで、粒度偏析が顕在化しない塊成炭のサイズについて検討した。図２は、ホッパーの断面図であり、領域Ｉ〜Ｖはホッパー内の各位置を示している。塊成炭の体積が大きくなるほど、壁面方向、つまり、領域Ｉ、領域Ｖ側に移動する塊成炭が多くなり、粒度偏析が顕在化する。このような粒度偏析を抑制するためには、後述の通り、塊成炭の体積を３０ｃｃ以下に設定する必要がある。   The coarse coal, the first agglomerated coal, and the second agglomerated coal are conveyed to the coal tower 16 and charged into the coke oven 17 from a hopper provided in the coal tower 16. Here, as the volume of the agglomerated coal increases, the bulk density increases because the particle size distribution of the charged coal widens, but when the volume of the agglomerated coal becomes too large, particle size segregation in the coal tower becomes obvious. When the storage level of the coal tower changes, the agglomerate ratio of the charged coal discharged from the coal tower also changes. Therefore, the fluctuation of the charging level becomes large, and as a result, the charging amount is reduced. Then, the size of the agglomerated coal in which particle size segregation did not appear was examined. FIG. 2 is a cross-sectional view of the hopper, and regions I to V indicate positions within the hopper. The larger the volume of the agglomerated coal, the more agglomerated coal that moves to the wall surface direction, that is, the region I and region V side, and grain size segregation becomes apparent. In order to suppress such particle size segregation, it is necessary to set the volume of the agglomerated coal to 30 cc or less as described later.

（実施例１）
次に、実施例を示して本発明について具体的に説明する。粉砕粒度がそれぞれ異なる複数の配合炭について微粉炭の振替率と嵩密度との関係を調べ、表１にその結果を示した。
粉砕粒度１は、配合炭全体の粉砕粒度を「粒径３ｍｍ以下の累積％が８０質量％」に設定したものであり、各原料炭を粉砕することにより、３０質量％の微粉炭と、７０質量％の粗粒炭とを得た。
粉砕粒度２は、配合炭全体の粉砕粒度を「粒径３ｍｍ以下の累積％が８５質量％」に設定したものであり、各原料炭を粉砕することにより、３３質量％の微粉炭と、６７質量％の粗粒炭とを得た。
粉砕粒度３は、配合炭全体の粉砕粒度を「粒径３ｍｍ以下の累積％が９０質量％」に設定したものであり、各原料炭を粉砕することにより、３７質量％の微粉炭と、６３質量％の粗粒炭とを得た。
粉砕粒度４は、配合炭全体の粉砕粒度を「粒径３ｍｍ以下の累積％が９５質量％」を設定したものであり、各原料炭を粉砕することにより、４２質量％の微粉炭と、５８質量％の粗粒炭とを得た。
本実施例では、微粉炭と粗粒炭との分級点は、０．５ｍｍに設定した。また、分級された微粉炭をダブルロール成型機を用いて塊成化した。フレーク状の塊成炭の体積は５ｃｃに設定し、ブリケット状の塊成炭（ピロー型）の体積は、１５ｃｃに設定した。

Figure 0005741246
Example 1
Next, an Example is shown and this invention is demonstrated concretely. The relationship between the change rate of pulverized coal and the bulk density was examined for a plurality of blended coals having different pulverized particle sizes, and the results are shown in Table 1.
The pulverized particle size 1 is obtained by setting the pulverized particle size of the entire blended coal to “cumulative% of particle size of 3 mm or less is 80% by mass”. By pulverizing each raw coal, 30% by mass of pulverized coal, A mass% of coarse coal was obtained.
The pulverized particle size 2 is obtained by setting the pulverized particle size of the entire blended coal to be “cumulative% having a particle size of 3 mm or less is 85 mass%”, and by pulverizing each raw coal, A mass% of coarse coal was obtained.
The pulverized particle size 3 is obtained by setting the pulverized particle size of the entire blended coal to be “cumulative% having a particle size of 3 mm or less is 90 mass%”. By pulverizing each raw coal, 37 mass% pulverized coal, A mass% of coarse coal was obtained.
The pulverized particle size 4 is set by setting the pulverized particle size of the entire blended coal as “cumulative% having a particle size of 3 mm or less is 95% by mass”. By pulverizing each raw material coal, A mass% of coarse coal was obtained.
In this example, the classification point between pulverized coal and coarse coal was set to 0.5 mm. Moreover, the classified pulverized coal was agglomerated using a double roll molding machine. The volume of flake-like agglomerated coal was set to 5 cc, and the volume of briquette-like agglomerated coal (pillow type) was set to 15 cc.
Figure 0005741246

粉砕粒度１〜４のそれぞれについて、塊成炭と粗粒炭を混合したものを、３０ｃｍ角の容器に１ｍの高さから装入した。この塊成炭については、振替率も変化させた。また、容器内の配合炭は、粒度偏析することなくほぼ均一に装入されていた。
その結果、表１で示す通り、配合炭の粉砕粒度が細かくなるほど、嵩密度が低下することがわかった。さらに、振替率が上がると嵩密度は、ほぼ直線的に上がることがわかった。粉砕粒度２の振替率０％（つまり、全ての微粉炭をフレーク状の塊成炭である第１の塊成炭の製造に振り向ける）の嵩密度０.８０（dry-ｔ／ｍ３）を基準としたとき、粉砕粒度を粉砕粒度３に変更して強粉砕することにより、嵩密度が０．００９（dry-ｔ／ｍ３）低下した。そこで、振替率を０％から２５％に引き上げて、一部の微粉炭をブリケット状の塊成炭である第２の塊成炭の製造に振り替えることにより嵩密度は基準値に上昇した。このように、粉砕粒度を細かくすることにより嵩密度が低下しても、ブリケットへの振替率を高めることにより、嵩密度を上昇させることができる。 For each of the pulverized particle sizes 1 to 4, a mixture of agglomerated coal and coarse coal was charged into a 30 cm square container from a height of 1 m. For this agglomerated coal, the transfer rate was also changed. In addition, the blended coal in the container was charged almost uniformly without segregation in particle size.
As a result, as shown in Table 1, it was found that the bulk density decreased as the pulverized particle size of the blended coal became finer. Furthermore, it was found that the bulk density increases almost linearly as the transfer rate increases. Bulk density 0.80 (dry-t / m 3 ) of pulverized particle size 2 transfer rate 0% (that is, all pulverized coal is directed to the production of the first agglomerated coal that is flaky agglomerated) , The bulk density was decreased by 0.009 (dry-t / m 3 ) by changing the pulverized particle size to the pulverized particle size 3 and performing strong pulverization. Therefore, the bulk density increased to the reference value by raising the transfer rate from 0% to 25% and transferring some of the pulverized coal to the production of the second agglomerated coal, which is briquette agglomerated coal. Thus, even if the bulk density is reduced by reducing the pulverization particle size, the bulk density can be increased by increasing the transfer rate to briquette.

表２は、表１に対応するものであり、ブリケット状の塊成炭（ピロー型）の体積を５０ｃｃに設定した点で表１と異なる。

Figure 0005741246
表１及び表２を比較参照して、塊成炭の体積を大きくすることにより、直線の傾きが大きくなることがわかった。したがって、塊成炭の体積を大きくすることにより、より少ない振替率で基準の嵩密度に到達することが証明された。なお、特許請求の範囲では、ブリケット状の塊成炭の体積の上限値を３０ｃｃに設定しているが、本実施例では、塊成炭の体積と嵩密度との関係を明らかにするために、前記上限値より体積が大きいブリケット状の塊成炭を用いている。 Table 2 corresponds to Table 1, and differs from Table 1 in that the volume of briquette agglomerated coal (pillow type) is set to 50 cc.
Figure 0005741246
 By comparing and referring to Table 1 and Table 2, it was found that the slope of the straight line was increased by increasing the volume of the agglomerated coal. Therefore, it was proved that the standard bulk density was reached with a smaller transfer rate by increasing the volume of the agglomerated coal. In addition, although the upper limit of the volume of briquette-like agglomerated coal is set to 30 cc in the claims, in this example, in order to clarify the relationship between the volume of agglomerated coal and the bulk density The briquette agglomerated coal having a volume larger than the upper limit is used.

（実施例２）
次に、実施例２を示してブリケット状の塊成炭の体積の上限値を３０ｃｃに設定した理由を詳細に説明する。分級点を０．５ｍｍに設定することにより、粉砕された配合炭を粗粒炭と微粉炭とに分級した。ホッパーには粗粒炭を６０質量％、微粉炭をダブルロール成型機を用いて塊成化した塊成炭を４０質量％装入した。ホッパー内の石炭の上面の各位置（図２の位置Ｉ〜Ｖ）で石炭をサンプリングし、塊成炭の割合を測定した。その結果を表３に示す。

Figure 0005741246
(Example 2)
Next, the reason why the upper limit value of the volume of briquetted agglomerated coal is set to 30 cc will be described in detail with reference to Example 2. By setting the classification point to 0.5 mm, the pulverized blended coal was classified into coarse coal and pulverized coal. The hopper was charged with 60% by mass of coarse coal and 40% by mass of agglomerated coal obtained by agglomerating pulverized coal using a double roll molding machine. Coal was sampled at each position on the upper surface of the coal in the hopper (positions I to V in FIG. 2), and the ratio of agglomerated coal was measured. The results are shown in Table 3.
Figure 0005741246

塊成炭Ａは、体積が５ｃｃのフレーク状の第１の塊成炭である。塊成炭Ｂは、体積が１５ｃｃでピロー型ブリケット状の第２の塊成炭である。塊成炭Ｃは、体積が２５ｃｃでピロー型ブリケット状の第２の塊成炭である。塊成炭Ｄは、体積が３５ｃｃでピロー型ブリケット状の第２の塊成炭である。塊成炭Ｅは、体積が５０ｃｃのピロー型ブリケット状の第２の塊成炭である。   The agglomerated coal A is a flaky first agglomerated coal having a volume of 5 cc. The agglomerated coal B is a second agglomerated coal having a volume of 15 cc and having a pillow briquette shape. The agglomerated coal C is a second agglomerated coal with a volume of 25 cc and a pillow briquette shape. The agglomerated coal D is a second agglomerated coal having a volume of 35 cc and having a pillow-type briquette. The agglomerated coal E is a pillow-type briquette second agglomerated coal having a volume of 50 cc.

粒度偏析を調べるために、標準偏差により各塊成炭Ａ〜Ｅの粒度偏析（各領域Ｉ〜Ｖにおける塊成炭の比率）を評価した。その結果を表４に示す。

Figure 0005741246
In order to examine the particle size segregation, the particle size segregation (the ratio of the agglomerated coal in each region I to V) of each agglomerated coal A to E was evaluated by the standard deviation. The results are shown in Table 4.
Figure 0005741246

塊成炭Ｂ及びＣでは従来使用している塊成炭Ａと塊成炭比率の標準偏差が同等であるが、塊成炭Ｄ〜Ｅのように体積が３０ｃｃよりも大きくなると、体積の増加に応じて塊成炭比率の標準偏差が大きく増加した。したがって、粒度偏析を顕在化させないためには、第２の塊成炭の体積の上限値を３０ｃｃに設定する必要がある。   Although the standard deviation of the ratio of the agglomerated coal A and the agglomerated coal A used conventionally is the same in the agglomerated coals B and C, when the volume is larger than 30 cc like the agglomerated coals D to E, the volume increases. As a result, the standard deviation of the agglomerated coal ratio increased greatly. Therefore, in order not to reveal the particle size segregation, it is necessary to set the upper limit value of the volume of the second agglomerated coal to 30 cc.

符合の説明Explanation of sign

１１ 粉砕装置
１２ 乾燥分級装置
１３ 振り分け部
１４ 第１の塊成機
１５ 第２の塊成機
１６ 石炭塔
１７ コークス炉 DESCRIPTION OF SYMBOLS 11 Crushing device 12 Drying classification device 13 Sorting part 14 1st agglomeration machine 15 2nd agglomeration machine 16 Coal tower 17 Coke oven

Claims (5)

配合炭全体の粉砕粒度が粒径３ｍｍ以下の累積％が８５質量％以上となるように、前記配合炭を構成する各原料炭をそれぞれ個別の粉砕粒度で粉砕し、この粉砕後の前記配合炭を粗粒炭と微粉炭とに分級し、この分級された微粉炭を塊成化することにより、塊成炭と前記粗粒炭とからなるコークス炉装入用の装入炭を製造するコークス炉装入炭の製造方法において、
前記塊成炭は、第１の塊成機で塊成化された体積が１０ｃｃ以下の第１の塊成炭と、第２の塊成機で塊成化された体積が１０ｃｃよりも大きく３０ｃｃ以下の第２の塊成炭とからなり、
前記微粉炭のうち前記第２の塊成炭の製造に振り向ける前記微粉炭の比率が高くなる程、コークス炉に装入される装入炭の嵩密度が増加する相関特性に基づき、前記嵩密度が目標の嵩密度を満足するように前記比率を調整することを特徴とするコークス炉装入炭の製造方法。 Each raw coal constituting the blended coal is pulverized with individual pulverized particle sizes so that the cumulative percentage with a particle size of 3 mm or less of the pulverized particle size of the entire blended coal is 85% by mass or more. Coke is produced by classifying coal into coarse coal and pulverized coal, and agglomerating the classified pulverized coal to produce a charge coal for coke oven charging composed of the agglomerated coal and the coarse coal. In the manufacturing method of furnace charging coal,
The agglomerated coal has a first agglomerated volume of 10 cc or less agglomerated by the first agglomerator and a volume agglomerated by the second agglomerator is larger than 10 cc and 30 cc. Consisting of the following second agglomerated coal,
Based on the correlation characteristic that the bulk density of the charged coal charged into the coke oven increases as the ratio of the pulverized coal directed to the production of the second agglomerated coal among the pulverized coal increases. A method for producing a coke oven charging coal, wherein the ratio is adjusted so that the density satisfies a target bulk density. 前記配合炭は、前記原料炭として最大長さで１．５ｍｍ以上の粗大イナート組織の含有量が５〜７体積％の境界値を用いて、該含有量が境界値よりも高い高イナート含有炭を含み、該高イナート含有炭の前記個別の粉砕粒度は、粒径３ｍｍ以下の累積％が９０質量％以上であることを特徴とする請求項１に記載のコークス炉装入炭の製造方法。   The blended coal uses a boundary value of 5 to 7% by volume of a coarse inert structure having a maximum length of 1.5 mm or more as the raw coal, and the content of the high inert coal is higher than the boundary value. 2. The method for producing coke oven charging coal according to claim 1, wherein the individual pulverized particle size of the high-inert coal is 90% by mass or more with a cumulative percentage of a particle size of 3 mm or less. 前記第１の塊成炭は、フレーク状であることを特徴とする請求項１又は２に記載のコークス炉装入炭の製造方法。   The method for producing a coke oven charging coal according to claim 1 or 2, wherein the first agglomerated coal has a flake shape. 前記第２の塊成炭は、ブリケット状であることを特徴とする請求項１乃至３のうちいずれか一つに記載のコークス炉装入炭の製造方法。   The method for producing coke oven charging coal according to any one of claims 1 to 3, wherein the second agglomerated coal has a briquette shape. 請求項１乃至４のうちいずれか一つに記載の製造方法により製造された前記装入炭をコークス炉で乾留することによりコークスを製造するコークスの製造方法。   A coke production method for producing coke by dry-distilling the charged coal produced by the production method according to any one of claims 1 to 4 in a coke oven.
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