WO2016147616A1 - Method for manufacturing compaction molded coal and method for manufacturing blast furnace coke - Google Patents

Method for manufacturing compaction molded coal and method for manufacturing blast furnace coke Download PDF

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WO2016147616A1
WO2016147616A1 PCT/JP2016/001302 JP2016001302W WO2016147616A1 WO 2016147616 A1 WO2016147616 A1 WO 2016147616A1 JP 2016001302 W JP2016001302 W JP 2016001302W WO 2016147616 A1 WO2016147616 A1 WO 2016147616A1
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coal
compacted
moisture
producing
product
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French (fr)
Japanese (ja)
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幹也 永山
深田　喜代志
松井　貴
勇介 土肥
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Ｊｆｅスチール株式会社
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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
    • C10B45/00—Other details
    • C10B45/02—Devices for producing compact unified coal charges outside the oven

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  • the present invention relates to a method for producing a compacted product of coal by charging the coal charged into a coking chamber of a coke oven and dry-distilled, and to improve the strength of the compacted product by managing the moisture of the coal. Regarding the method.
  • Blast furnace coke is required to be strong enough to ensure air permeability in the blast furnace, that is, to have strength. It is known that non-slightly caking coal with low caking properties or no caking properties is difficult to use as a coke raw material and caking coal with high caking properties is easy to use in terms of giving strength to coke. ing. However, it is expected that the supply amount of caking coal will decrease in the future, and it has become difficult to ensure the stability of caking coal for a long time. Therefore, it is desirable to use non-slightly caking coal as a coke raw material and to be able to produce high strength coke.
  • the compacting method it is necessary to charge a compacted compact into the carbonization chamber. However, if the strength of the compacted compact is small during the charging, the compacted compact may collapse.
  • the total moisture (water content) of coal is set to approximately 12 mass%, and the coal is compacted, so that the bulk density at the time of compaction is sufficiently improved, and the compacted product has high strength.
  • Patent Document 2 if the total moisture of coal to be compacted is within a predetermined range, the compacted coal has a sufficiently high bulk density, and the compacted product collapses when charged into the carbonization chamber. It can be suppressed. However, even if the total moisture is within the predetermined range, depending on the brand of the coal to be compacted, even if the coal is compacted, the strength of the compacted product of the coal may not be improved more than expected. .
  • the present invention has been made in view of the above circumstances, and the object thereof is coal that can improve the strength of a compacted product of coal more reliably regardless of the brand of coal to be compacted. It is providing the manufacturing method of the compacting molding of this.
  • the present inventors diligently studied why the consolidated molded product may not have the assumed high strength even if the moisture of coal is controlled with the total moisture (water content) up to 12 mass%. As a result, since the moisture absorbed in the coal (embedded moisture) differs depending on the brand of the coal, the moisture content on the surface of the coal serving as a binder of the compacted product is different, It was thought that the adhesive strength and the bulk density of the compacted product varied, and the strength of the compacted product might not be as expected. Therefore, the present inventors have studied to use the moisture considering the inclusion moisture of coal, not the total moisture of coal, as a management index in the compacting method, and have completed the present invention.
  • the gist of the present invention is as follows.
  • (1) A method for producing a compacted product by compacting coal, wherein the surface moisture obtained by subtracting the stored moisture from the total moisture of the coal is 5 mass% or more and 12 mass% or less.
  • a method for producing a compacted molded article (2) The method for producing a compacted coal according to (1), wherein the coal is two or more brands of coal or a blended coal containing two or more brands of coal and a binder.
  • the coal to be compacted has a particle size distribution in which a Fuller index of an Andrewsen distribution is 0.30 or more and 0.75 or less, according to any one of (1) to (6), Method for producing compacted coal.
  • a method for producing coke for a blast furnace wherein the compacted product produced by the method for producing a compacted product of coal according to any one of (1) to (7) is placed in a carbonization chamber of a coke oven.
  • a method for producing coke for blast furnace comprising charging and producing the coke for blast furnace by dry distillation of the compacted product.
  • the strength of the coal compacted product can be more reliably improved regardless of the brand of coal. It is possible to charge the coking oven in the coking chamber without causing the material to collapse.
  • the average maximum reflectance Ro of vitrinite is the average maximum reflectance of vitrinite of JIS M 8816 coal, and is a measure representing the degree of coal coalization.
  • the Gieseler maximum fluidity MF [ddpm] is a scale representing caking property and is defined in JIS M8801. Coal is said to have caking properties as the Gieseler maximum fluidity MF is higher.
  • Table 1 the common logarithm value [logddpm] of the Geeseeller maximum fluidity MF is shown.
  • the total inert amount TI is the total inert amount [volume%] in the coal structure analysis calculated by the following formula [1] based on the method of measuring the fine structure component of coal of JIS M 8816 and the Parr formula described in the description. It is a scale showing the composition of coal organization.
  • Total inert amount [% by volume] Fujinit [Volume%] + Mikurinit [Volume%] + (2/3) ⁇ Semi-Fujinit [Vol%] + Mineral [Volume%] [1]
  • the total moisture [mass%] on the horizontal axis is the moisture of coal measured by the air drying loss method of JISM8812. The measurement of the compacted body strength on the vertical axis was performed as follows.
  • the compact strength itself varies depending on the coal.
  • coal C has a generally higher compact strength than coals A and B.
  • the coal C is generally maintained at a high strength if the total moisture is 9 mass% or more and 15 mass% or less, but if the total moisture is less than 9 mass% or exceeds 15 mass%, the compact strength is low. It becomes.
  • the coal B even if the total moisture is about 17.5 mass%, the compact body strength is maintained at a high level.
  • the range of the total moisture of the coal which makes the strength of the compacted product high is different depending on the brand of the coal.
  • the present inventors suppose that various brands of coal are used in the compacted product, and even if the total moisture is constant in all of the various brands of coal, the role of the binder that bonds the coals 1 to each other. It is surmised that only surface moisture 3 is fulfilled, and if the amount of surface moisture 3 differs between various brands of coal, it will be assumed that there will be variations in the adhesion between the coals and the bulk density of the compacted product. Based on this inference, the present inventors manage the moisture content of coal 1 using surface moisture 3 instead of total moisture as an index. As a result, the present invention has been completed.
  • the present invention uses the amount of surface moisture of coal to be compacted as a management index, and the present inventors generally increase the strength of the compacted body by setting the surface moisture to 5 mass% or more and 12 mass% or less. It was found that it is possible to maintain.
  • FIG. 3 shows the relationship between the surface moisture [mass%] of coal and the compacted body strength [kPa] of coal, which is a management index of the present invention.
  • the consolidated body strength on the vertical axis of the graph of FIG. 3 is a value measured under the same conditions as in FIG.
  • the surface moisture on the horizontal axis of the graph of FIG. 3 is based on a value obtained by subtracting the stored moisture [mass%] from the total moisture, and the total moisture is measured in the same manner as in the graph of FIG.
  • the embedded moisture can be measured by the method defined in JIS M 8803 or the method described in Non-Patent Document 1, and the values are almost the same regardless of which method is used.
  • surface moisture can be made into 5 mass% or more and 12 mass% or less by adjusting the total water
  • the surface moisture on the horizontal axis of the graph of FIG. 3 is a moisture amount [mass%] calculated by subtracting the coal-containing moisture measured by the method described in Non-Patent Document 1 from the measured total moisture.
  • Coal A has a moisture content of 3.47 mass%
  • coal B has 5.11 mass%
  • coal C has 3.32 mass%.
  • the compacted body strength itself is different.
  • coal C has a higher compacted body strength than coals A and B.
  • the range of the surface moisture of the coal with a high compacted body strength is the same as 5 mass% or more and 12 mass% or less for any brand of coal A to C. If the surface moisture exceeds 12 mass%, moisture will be excessively present in the compacted product, and part of the force due to compaction will work to discharge water between coals, and only the remaining force will be in the compacted product. This will increase the bulk density. Therefore, it is presumed that the bulk density of the compacted product is difficult to increase and the compact strength is not improved.
  • the range of the surface moisture of coal for increasing the compacted body strength is more preferably 6 mass% or more and 11 mass% or less, and further preferably 7 mass% or more and 10 mass% or less.
  • the coal to be compacted may be two or more brands of coal or a blended coal containing two or more brands of coal and a binder.
  • the surface moisture of the blended coal is calculated based on the stored moisture of the blended coal.
  • the stored moisture of the blended coal may actually be measured.
  • the moisture content of each brand of coal or binder in the blended coal is measured, and the weight of the blend ratio [mass%] of each brand of coal or binder is the weight of each brand of coal or binder.
  • the weighted average value of the stored moisture may be the stored moisture of the blended coal.
  • binder examples include asphalt pitch, and the moisture contained in the binder can be measured by a method defined in JIS M 8803 or a method described in Non-Patent Document 1, similarly to coal. Moreover, about the total water
  • Blended coal 1 and blended coal 2 composed of coals B to H having different properties were produced.
  • properties of coal represented by vitrinite average maximum reflectance Ro [%], Gieseller maximum fluidity MF [ddpm], total inert amount TI [volume%], and stored moisture are shown in Table 2. Shown in
  • Both Coal Coal 1 and Coal Coal 2 have coal B to H so that the average maximum reflectance Ro [%] of Vitrinite, Gieseler maximum fluidity MF [ddpm] and total inert amount TI [volume%] are the same.
  • the average maximum reflectance Ro was 1.02%
  • the Gieseler maximum fluidity MF was 2.20 logddpm in common logarithm
  • the total inert amount TI was 35.0% by volume.
  • Table 3 shows the blending ratio [mass%] of coal of each brand of blended coal 1 and blended coal 2 and the moisture content of blended coal 1 and blended coal 2.
  • Table 3 shows the blending ratio [mass%] of coal of each brand of blended coal 1 and blended coal 2 and the moisture content of blended coal 1 and blended coal 2.
  • the stored moisture a directly measured value and a weighted average value calculated by weighted averaging of the stored moisture of coals B to H with the blending ratio as a weight are shown.
  • the directly measured value of the stored moisture is a value measured by the method described in Non-Patent Document 1.
  • FIG. 4 shows the relationship between the surface moisture [mass%] of the blended coal and the compacted body strength [kPa] of the blended coal.
  • the compacted body strength on the vertical axis of the graph of FIG. 4 is a value obtained by measuring the compacted body strength of the blended coal 1 and blended coal 2 as in the case of FIG.
  • moisture content of the horizontal axis of the graph of FIG. 4 measured the total water
  • the compact body strength is maintained at a high level.
  • the range of the surface moisture of the coal for increasing the compact body strength is more preferably 6 mass% or more and 11 mass% or less, and 7 mass% or more and 10 mass% or less. Is more preferable.
  • the value measured directly and the value calculated by the weighted average are almost the same for the stored moisture. Therefore, even if the surface moisture on the horizontal axis of the graph of FIG. 4 is calculated by adopting the value calculated by weighted average as the stored moisture, the calculated surface moisture is substantially the same as the surface moisture of the graph of FIG. Value.
  • the width and height of the compacted product need only be smaller than the width and height of the carbonization chamber of the coke oven, and the width of the compacted product may be about 1/4 to 1/3 of the width of the carbonization chamber.
  • These compacted moldings may be sequentially charged into the same carbonization chamber.
  • one compacted product may be charged into the carbonization chamber with the width and height of the compacted product being approximately similar to the width and height of the carbonization chamber.
  • the coal is compacted so that the density of the compacted product is 1.0 to 1.2 ton / m 3 on the basis of dry distillation, and the compacted product is charged into the carbonization chamber of the coke oven and dry-distilled to form a blast furnace. If coke is manufactured, high strength blast furnace coke can be manufactured.
  • the coal to be molded has a predetermined particle size distribution. It is known that the particle size distribution of coal follows the Rosin-Rammler distribution described in Non-Patent Document 2.
  • the Rosin-Rammler equation is expressed by the following equation [2].
  • Dp the particle diameter of the coal particles
  • P the ratio of particles having a particle diameter Dp or more
  • a and b are constants.
  • the constant b is called an equal number and is an index of the particle size distribution of the powder. As the uniform number increases, the width of the particle size distribution decreases.
  • the method of obtaining the constants b by experiment, determine the common logarithm logD p and log ⁇ log (100 / P) ⁇ , taking the log ⁇ log (100 / P) ⁇ in the horizontal axis logD p, the vertical axis, approximate Find a straight line.
  • the slope of this approximate line is a constant b.
  • a least square method or the like can be used as a means for obtaining the approximate straight line.
  • the Andreasen equation described in Non-Patent Document 3 is known as a particle size distribution function representing the filling property during powder compression.
  • the Andreasen equation is expressed by the following equation [3].
  • Non-P 100 (D p / D p, max ) m [3]
  • D p is the particle size of coal particles
  • P is the ratio of particles having a particle size of D p or more
  • D p, max is the maximum particle size of particles
  • m is an index of particle size distribution called Fuller index.
  • the value of the Fuller index is small.
  • Non-Patent Document 3 describes that when the Fuller index is between 0.5 and 0.33, the compacted product has a maximum density by pressing.
  • the present inventors investigated the strength of the molded product when the particle size distribution was changed using the blended coal prepared using the coals in Tables 1 and 2 in the same manner as described above.
  • Table 4 shows the blending ratio of the coal used.
  • the average maximum reflectivity Ro of the blended coal 3 is 1.00%
  • the ghiser cell maximum fluidity MF is 2.39 logddpm as a common logarithm
  • the total inert amount TI is 30.0 vol%.
  • Plural brands of coal were blended so that the maximum reflectance Ro was 1.00%, the Gieseler maximum fluidity MF was 2.30 logddpm in common logarithm, and the total inert amount TI was 30.0% by volume.
  • FIG. 5 shows the relationship between the equivalent number obtained from the Rosin-Rammler equation based on the particle size distribution of the blended coal shown in Table 4 and the strength of the compacted product of the blended coal, and the Andreasen equation based on the particle size distribution of the blended coal
  • FIG. 6 shows the relationship between the Fuller index and the strength of the compacted molded product of the blended coal. According to the graphs of FIGS. 5 and 6, in both the blended coals 3 and 4, in the range where the even number exceeds 1.3 or the Fuller index exceeds 0.75, the strength of the compacted molded product as the index decreases.
  • the strength of the compacted molded product is maintained at a high level.
  • the uniform number is less than 0.7 or the Fuller index is less than 0.75, the strength of the compacted product is greatly reduced. From these results, it was found that the compacted product has high strength when the uniform number is 0.7 or more and 1.3 or less, and has high strength when the Fuller index is 0.30 or more and 0.75 or less.
  • the range of the uniform number for increasing the strength of the compacted product is more preferably 0.8 or more and 1.2 or less, and further preferably 0.9 or more and 1.1 or less.
  • the range of the Fuller index is more preferably 0.40 or more and 0.65 or less, and further preferably 0.50 or more and 0.55 or less.
  • the surface moisture of the coal is 5 mass% or more and 12 mass% or less, the strength of the coal compacted product can be reliably improved. Thereby, it becomes possible to insert into a carbonization chamber, without destroying the compacted product of coal, and to manufacture high strength blast furnace coke. Even when various brands of coal are compacted, it is more preferable that the coal has a predetermined particle size distribution.

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Abstract

Provided is a method for manufacturing a compaction molded coal with which the strength of the compaction molded coal can be more reliably improved regardless of the brand of the coal that is to be compaction molded. Compaction molded coal is manufactured by compaction molding coal 1, which is charged and carbonized in a carbonization chamber of a coke furnace. The surface moisture 3 of the coal is made to be 5 mass% to 12 mass%. The contained moisture 2 in the coal 1 is measured. The value obtained by subtracting the contained moisture 2 from the total moisture in the coal 1 that is to be compaction molded is the surface moisture 3 of the coal 1 that is to be compaction molded.

Description

石炭の圧密成型物の製造方法及び高炉用コークスの製造方法Method for producing compacted molded product of coal and method for producing coke for blast furnace
　本発明は、コークス炉の炭化室に装入され乾留される石炭を圧密成型して、石炭の圧密成型物を製造する方法に関し、石炭の水分を管理して圧密成型物の強度の向上を図る方法に関する。 The present invention relates to a method for producing a compacted product of coal by charging the coal charged into a coking chamber of a coke oven and dry-distilled, and to improve the strength of the compacted product by managing the moisture of the coal. Regarding the method.
　高炉用コークスは、高炉内の通気性を確保するべく十分堅牢であること、すなわち、強度が求められる。コークスに強度を持たせるという点で、粘結性が低いあるいは粘結性がない非微粘結炭はコークス原料に使用しにくく、粘結性が高い粘結炭は使用し易いことが知られている。しかしながら、今後、粘結炭の供給量が減少していくことが予想され、長期にわたって粘結炭を安定確保することが困難となってきている。よって、コークス原料として、非微粘結炭を積極的に使用するとともに、高い強度のコークスを製造可能とすることが望ましい。 Blast furnace coke is required to be strong enough to ensure air permeability in the blast furnace, that is, to have strength. It is known that non-slightly caking coal with low caking properties or no caking properties is difficult to use as a coke raw material and caking coal with high caking properties is easy to use in terms of giving strength to coke. ing. However, it is expected that the supply amount of caking coal will decrease in the future, and it has become difficult to ensure the stability of caking coal for a long time. Therefore, it is desirable to use non-slightly caking coal as a coke raw material and to be able to produce high strength coke.
　非微粘結炭を高炉用コークスの原料として利用可能とする技術として、コークス炉の炭化室に装入する前に、石炭を直方体状に圧密成型する圧密成型法がある（例えば、特許文献１参照）。圧密成型された石炭は、嵩密度が、通常の炭化室に落下させて装入された石炭の場合の約１．５倍程度になる。圧密成型法では、石炭が圧縮され、圧縮された石炭の粒子間距離が短くなり、製造されるコークスは緻密化し、該コークスの強度は向上する。 As a technique for making non-slightly caking coal available as a raw material for coke for a blast furnace, there is a compacting method in which coal is compacted into a rectangular parallelepiped before charging into a coking chamber of a coke oven (for example, Patent Document 1). reference). The compacted coal has a bulk density of about 1.5 times that of coal charged by dropping into a normal carbonization chamber. In the compacting method, coal is compressed, the inter-particle distance of the compressed coal is shortened, the coke produced is densified, and the strength of the coke is improved.
　圧密成型法では、圧密した圧密成型物を炭化室に装入することを必要とするものの、装入する際に、圧密成型物の強度が小さいと、圧密成型物が崩壊する可能性がある。特許文献２では、石炭の全水分（含水率）をほぼ１２ｍａｓｓ％までとし、石炭を圧密することで、圧密時の嵩密度が十分向上し、圧密成型物が高強度となるとされている。 In the compacting method, it is necessary to charge a compacted compact into the carbonization chamber. However, if the strength of the compacted compact is small during the charging, the compacted compact may collapse. In Patent Document 2, the total moisture (water content) of coal is set to approximately 12 mass%, and the coal is compacted, so that the bulk density at the time of compaction is sufficiently improved, and the compacted product has high strength.
特開昭５６－１１０７８４号公報Japanese Patent Laid-Open No. 56-110784 特開昭５３－２５６０２号公報JP-A-53-25602
　特許文献２によれば、圧密成型対象の石炭の全水分を所定の範囲とすれば、圧密成型された石炭は嵩密度が十分向上し、炭化室へ装入する際の圧密成型物の崩壊を抑えることができるとされている。しかしながら、全水分を所定の範囲としても、圧密成型対象の石炭の銘柄によっては、石炭を圧密成型しても、石炭の圧密成型物の強度を想定した以上に向上させることができない場合があった。 According to Patent Document 2, if the total moisture of coal to be compacted is within a predetermined range, the compacted coal has a sufficiently high bulk density, and the compacted product collapses when charged into the carbonization chamber. It can be suppressed. However, even if the total moisture is within the predetermined range, depending on the brand of the coal to be compacted, even if the coal is compacted, the strength of the compacted product of the coal may not be improved more than expected. .
　本発明は、上記事情に鑑みてなされたもので、その目的とするところは、圧密成型対象の石炭の銘柄に拘らず、石炭の圧密成型物の強度をより確実に向上させることが可能な石炭の圧密成型物の製造方法を提供することである。 The present invention has been made in view of the above circumstances, and the object thereof is coal that can improve the strength of a compacted product of coal more reliably regardless of the brand of coal to be compacted. It is providing the manufacturing method of the compacting molding of this.
　本発明者らは、全水分（含水率）を１２ｍａｓｓ％までとして、石炭の水分を管理しても、圧密成型物が、想定した高い強度とならない場合がある理由を鋭意検討した。その結果、本発明者らは、石炭の銘柄によっては石炭内部に吸収される水分（包蔵水分）が異なるので、圧密成型物のバインダーの役割を果たす石炭の表面の水分量が異なり、石炭同士の付着力や圧密成型物の嵩密度にバラツキが生じ、圧密成型物の強度が、想定した程度になっていない可能性があると考えた。そこで、本発明者らは、石炭の全水分ではなく、石炭の包蔵水分を考慮した水分を、圧密成形法における管理指標とすることを検討し、本発明の完成に至った。 The present inventors diligently studied why the consolidated molded product may not have the assumed high strength even if the moisture of coal is controlled with the total moisture (water content) up to 12 mass%. As a result, since the moisture absorbed in the coal (embedded moisture) differs depending on the brand of the coal, the moisture content on the surface of the coal serving as a binder of the compacted product is different, It was thought that the adhesive strength and the bulk density of the compacted product varied, and the strength of the compacted product might not be as expected. Therefore, the present inventors have studied to use the moisture considering the inclusion moisture of coal, not the total moisture of coal, as a management index in the compacting method, and have completed the present invention.
　すなわち、本発明の要旨は以下の通りである。
（１）石炭を圧密成型し、圧密成型物を製造する方法であって、前記石炭の全水分から包蔵水分を減算して求まる表面水分を５ｍａｓｓ％以上１２ｍａｓｓ％以下とすることを特徴とする石炭の圧密成型物の製造方法。
（２）前記石炭は、２銘柄以上の石炭あるいは２銘柄以上の石炭と粘結材を含む配合炭であることを特徴とする（１）に記載の石炭の圧密成型物の製造方法。
（３）前記全水分及び前記包蔵水分を測定して前記表面水分を求めることを特徴とする（１）または（２）に記載の石炭の圧密成型物の製造方法。
（４）前記配合炭の全水分を測定し、各銘柄の石炭あるいは粘結材の包蔵水分を測定し、
　各銘柄の石炭あるいは粘結材の配合割合を重みとして、測定された包蔵水分を加重平均して加重平均値を得、前記配合炭の全水分から前記加重平均値を減算して、前記配合炭の表面水分を求めることを特徴とする（２）に記載の石炭の圧密成型物の製造方法。
（５）前記圧密成型物の密度が乾留基準で１．０～１．２トン／ｍ３となるように石炭を圧密成型することを特徴とする（１）～（４）のいずれか１つに記載の石炭の圧密成型物の製造方法。
（６）前記圧密成型される石炭は、Ｒｏｓｉｎ－Ｒａｍｍｌｅｒの分布の均等数が０．７０以上１．３０以下となる粒度分布を有することを特徴とする（１）～（５）のいずれか１つに記載の石炭の圧密成型物の製造方法。
（７）前記圧密成型される石炭は、Ａｎｄｒｅａｓｅｎ分布のＦｕｌｌｅｒ指数が０．３０以上０．７５以下となる粒度分布を有することを特徴とする（１）～（６）のいずれか１つに記載の石炭の圧密成型物の製造方法。
（８）高炉用コークスの製造方法であって、（１）～（７）のいずれか１つに記載の石炭の圧密成型物の製造方法で製造された圧密成型物をコークス炉の炭化室に装入し、前記圧密成型物を乾留して高炉用コークスを製造することを特徴とする高炉用コークスの製造方法。 That is, the gist of the present invention is as follows.
(1) A method for producing a compacted product by compacting coal, wherein the surface moisture obtained by subtracting the stored moisture from the total moisture of the coal is 5 mass% or more and 12 mass% or less. A method for producing a compacted molded article.
(2) The method for producing a compacted coal according to (1), wherein the coal is two or more brands of coal or a blended coal containing two or more brands of coal and a binder.
(3) The method for producing a compacted product of coal according to (1) or (2), wherein the surface moisture is obtained by measuring the total moisture and the embedded moisture.
(4) Measure the total moisture of the blended coal, measure the moisture content of each brand of coal or binder,
The weight of the blended proportion of each brand of coal or binder is weighted to obtain a weighted average value of the measured moisture content, and the weighted average value is subtracted from the total moisture of the blended coal, The method for producing a compacted product of coal according to (2), wherein the surface moisture of the coal is determined.
(5) Any one of (1) to (4), wherein the coal is compacted so that the density of the compacted product is 1.0 to 1.2 ton / m 3 on a dry distillation basis. A method for producing a compacted product of coal as described in 1.
(6) Any one of (1) to (5), wherein the coal to be compacted has a particle size distribution in which an equal number of distributions of Rosin-Rammler is 0.70 or more and 1.30 or less. A method for producing a compacted product of coal as described in 1.
(7) The coal to be compacted has a particle size distribution in which a Fuller index of an Andrewsen distribution is 0.30 or more and 0.75 or less, according to any one of (1) to (6), Method for producing compacted coal.
(8) A method for producing coke for a blast furnace, wherein the compacted product produced by the method for producing a compacted product of coal according to any one of (1) to (7) is placed in a carbonization chamber of a coke oven. A method for producing coke for blast furnace, comprising charging and producing the coke for blast furnace by dry distillation of the compacted product.
　本発明によれば、様々な銘柄の石炭を圧密成型する場合であっても、石炭の銘柄に拘わらず、石炭の圧密成型物の強度をより確実に向上させることが可能となり、石炭の圧密成型物を崩壊させることなく、コークス炉の炭化室に装入することが可能となる。 According to the present invention, even when various brands of coal are compacted, the strength of the coal compacted product can be more reliably improved regardless of the brand of coal. It is possible to charge the coking oven in the coking chamber without causing the material to collapse.
石炭の全水分［ｍａｓｓ％］と石炭の圧密体強度［ｋＰａ］との関係を示すグラフである。It is a graph which shows the relationship between the total moisture [mass%] of coal, and the compacted body strength [kPa] of coal. 水に濡れた石炭を示す図である。It is a figure which shows the coal wet in water. 石炭の表面水分［ｍａｓｓ％］と石炭の圧密体強度［ｋＰａ］との関係を示すグラフである。It is a graph which shows the relationship between the surface moisture [mass%] of coal, and the compacted body strength [kPa] of coal. 配合炭の表面水分［ｍａｓｓ％］と配合炭の圧密体強度［ｋＰａ］との関係を示すグラフである。It is a graph which shows the relationship between the surface moisture [mass%] of blended coal, and the compact body strength [kPa] of blended coal. 配合炭の粒度分布に基づいたＲｏｓｉｎ－Ｒａｍｍｌｅｒの式により求まる均等数と配合炭の圧密成型体強度との関係を表すグラフである。It is a graph showing the relationship between the equal number calculated | required by the Rosin-Rammler formula based on the particle size distribution of a combination coal, and the compacting body strength of a combination coal. 配合炭の粒度分布に基づいたＡｎｄｒｅａｓｅｎの式により求まるＦｕｌｌｅｒ指数と配合炭の圧密成型体強度との関係を表すグラフである。It is a graph showing the relationship between the Fuller index calculated | required by the formula of Andrewsen based on the particle size distribution of blended coal, and the compacting body strength of blended coal.
　まず、圧密成型物を構成する石炭の銘柄によって、圧密成型物の強度を高位とする石炭の全水分（含水率）の範囲が異なることを示す。ビトリニットの平均最大反射率Ｒｏ［％］、ギーセラー最高流動度ＭＦ［ｄｄｐｍ］、及び、全イナート量ＴＩ［体積％］で表される石炭の性状が相違する石炭Ａ～Ｃについて、全水分［ｍａｓｓ％］と、石炭Ａ～Ｃの各々を圧密成型して得られる圧密体（圧密成型物）強度［ｋＰａ］と、の関係を図１に示す。また、これらの性状を表１に示す。 First, it shows that the range of the total moisture (moisture content) of coal which makes the strength of the compacted product high is different depending on the brand of the coal constituting the compacted product. The total moisture [mass] for coals A to C having different average properties of Vitrinite, Ro [%], Gieseler maximum fluidity MF [ddpm], and total inert amount TI [volume%], are different. %] And the strength (kPa) of a compact (consolidated product) obtained by compacting each of coals A to C is shown in FIG. These properties are shown in Table 1.
Figure JPOXMLDOC01-appb-T000001
 　ビトリニットの平均最大反射率Ｒｏとは、ＪＩＳ　Ｍ　８８１６の石炭のビトリニットの平均最大反射率であり、石炭の石炭化度を表す尺度である。ギーセラー最高流動度ＭＦ［ｄｄｐｍ］とは、粘結性を表す尺度であり、ＪＩＳ　Ｍ　８８０１で規定されている。石炭は、ギーセラー最高流動度ＭＦが高いほど、粘結性があるとされている。なお、表１では、ギーセラー最高流動度ＭＦの常用対数値［ｌｏｇｄｄｐｍ］を示してある。
Figure JPOXMLDOC01-appb-T000001
 The average maximum reflectance Ro of vitrinite is the average maximum reflectance of vitrinite of JIS M 8816 coal, and is a measure representing the degree of coal coalization. The Gieseler maximum fluidity MF [ddpm] is a scale representing caking property and is defined in JIS M8801. Coal is said to have caking properties as the Gieseler maximum fluidity MF is higher. In addition, in Table 1, the common logarithm value [logddpm] of the Geeseeller maximum fluidity MF is shown.
　全イナート量ＴＩとは、ＪＩＳ　Ｍ　８８１６の石炭の微細組織成分の測定方法およびその解説に記載のＰａｒｒの式に基づいた下記式［１］で算出した石炭組織分析における全イナート量［体積％］であり、石炭組織の構成を示す尺度である。
全イナート量［体積％］＝フジニット［体積％］＋ミクリニット［体積％］＋（２／３）×セミフジニット［体積％］＋鉱物質［体積％］　［１］
　図１のグラフにおいて、横軸の全水分［ｍａｓｓ％］は、ＪＩＳＭ８８１２の空気中乾燥減量法で測定した石炭の水分である。縦軸の圧密体強度の測定は次の通りに行った。
（Ｉ）まずは、実際に使用する石炭の粒度として、代表的な３ｍｍ以下１００％である粒度の石炭を、様々な値の含水率に調整し、直径１２ｍｍの円柱状の金型に、含水率を調整した石炭をドライベースで１．３６ｇ装入した。
（II）次いで、金型中の石炭に最大４５ＭＰａの圧力を加え、石炭を圧密し、高さ１０ｍｍ程度の円柱状の石炭の圧密成型物を作製した。
（III）最後に、圧密成型物の引張強度を、オートグラフを使用した割裂引張試験により測定した。引張強度を圧密体強度［ｋＰａ］とした。 The total inert amount TI is the total inert amount [volume%] in the coal structure analysis calculated by the following formula [1] based on the method of measuring the fine structure component of coal of JIS M 8816 and the Parr formula described in the description. It is a scale showing the composition of coal organization.
Total inert amount [% by volume] = Fujinit [Volume%] + Mikurinit [Volume%] + (2/3) × Semi-Fujinit [Vol%] + Mineral [Volume%] [1]
In the graph of FIG. 1, the total moisture [mass%] on the horizontal axis is the moisture of coal measured by the air drying loss method of JISM8812. The measurement of the compacted body strength on the vertical axis was performed as follows.
(I) First, as the particle size of the coal actually used, coal having a particle size of 100% or less, which is representative of 3 mm or less, is adjusted to various values of water content, and the water content is converted into a cylindrical mold having a diameter of 12 mm. 1.36 g of the coal adjusted for was charged on a dry basis.
(II) Next, a maximum pressure of 45 MPa was applied to the coal in the mold to consolidate the coal, thereby producing a cylindrical coal compacted product having a height of about 10 mm.
(III) Finally, the tensile strength of the compacted product was measured by a split tensile test using an autograph. The tensile strength was set as the compacted body strength [kPa].
　図１のグラフに示すように、石炭によって、圧密体強度自体は異なり、例えば、石炭Ｃは、石炭Ａ及びＢに比べて概ね圧密体強度が高い。また、石炭Ｃは、概ね全水分が９ｍａｓｓ％以上１５ｍａｓｓ％以下であれば、圧密体強度が高位に維持されているが、全水分が９ｍａｓｓ％未満または１５ｍａｓｓ％を超えると、圧密体強度は低位となる。ところが、石炭Ｂでは、全水分が１７．５ｍａｓｓ％程度でも、圧密体強度が高位に維持されている。このように、石炭の銘柄によって、圧密成型物の強度を高位とする石炭の全水分の範囲が異なっている。 As shown in the graph of FIG. 1, the compact strength itself varies depending on the coal. For example, coal C has a generally higher compact strength than coals A and B. In addition, the coal C is generally maintained at a high strength if the total moisture is 9 mass% or more and 15 mass% or less, but if the total moisture is less than 9 mass% or exceeds 15 mass%, the compact strength is low. It becomes. However, in the coal B, even if the total moisture is about 17.5 mass%, the compact body strength is maintained at a high level. Thus, the range of the total moisture of the coal which makes the strength of the compacted product high is different depending on the brand of the coal.
　本発明者らは、圧密体強度を高位に維持することになる石炭の全水分の範囲が、石炭の銘柄によって異なる理由を鋭意検討した。水に濡れた石炭を図２に示し、図２を用いて、表面水分について説明する。石炭１中の水分は、一部が石炭内部に包蔵され、残りが石炭表面に付着している。石炭表面に付着している水分を表面水分３と呼ぶ。表面水分３は、石炭が圧密された時に、接触する石炭１同士を接着するバインダーの役割を果たすと推察される。また、石炭１の内部に包蔵される水分を包蔵水分２と呼ぶ。包蔵水分２は、石炭１が複数圧密されて形成される圧密成型物の強度には影響しないものと推察される。包蔵水分２は、内部に包蔵されているので、表面の接着には影響を及ぼさないからである。 The present inventors diligently studied why the range of the total moisture of coal that would maintain the compacted body strength at a high level differs depending on the brand of coal. Coal wetted with water is shown in FIG. 2, and surface moisture will be described with reference to FIG. A part of the moisture in the coal 1 is embedded inside the coal, and the rest adheres to the surface of the coal. Moisture adhering to the coal surface is called surface moisture 3. It is inferred that the surface moisture 3 plays a role of a binder that bonds the coals 1 that are in contact with each other when the coal is consolidated. Further, the moisture stored inside the coal 1 is referred to as stored moisture 2. It is presumed that the embedded moisture 2 does not affect the strength of a compacted product formed by consolidating a plurality of coals 1. This is because the stored moisture 2 is stored inside and does not affect the adhesion of the surface.
　本発明者らは、仮に、様々な銘柄の石炭を圧密成型物に用いることとし、その様々な銘柄の石炭の全てにおいて全水分を一定にしたとしても、石炭１同士を接着するバインダーの役割を果たすものは表面水分３のみであり、様々な銘柄の石炭で表面水分３の量が異なると、石炭同士の付着力や圧密成型物の嵩密度にバラツキが生じると推察した。この推察に基づいて、本発明者らは、全水分ではなく、表面水分３を指標として、石炭１の水分を管理すれば、性状が異なる様々な石炭１を用いても、圧密成型物の強度を常に高位にできると考え、本発明の完成に至った。本発明は、圧密成型対象の石炭の表面水分の量を管理指標とするものであり、本発明者らは、表面水分を５ｍａｓｓ％以上１２ｍａｓｓ％以下とすれば、概ね、圧密体強度を高位に維持することが可能であることを見出した。 The present inventors suppose that various brands of coal are used in the compacted product, and even if the total moisture is constant in all of the various brands of coal, the role of the binder that bonds the coals 1 to each other. It is surmised that only surface moisture 3 is fulfilled, and if the amount of surface moisture 3 differs between various brands of coal, it will be assumed that there will be variations in the adhesion between the coals and the bulk density of the compacted product. Based on this inference, the present inventors manage the moisture content of coal 1 using surface moisture 3 instead of total moisture as an index. As a result, the present invention has been completed. The present invention uses the amount of surface moisture of coal to be compacted as a management index, and the present inventors generally increase the strength of the compacted body by setting the surface moisture to 5 mass% or more and 12 mass% or less. It was found that it is possible to maintain.
　本発明の管理指標である石炭の表面水分［ｍａｓｓ％］と石炭の圧密体強度［ｋＰａ］との関係を図３に示す。図３のグラフの縦軸の圧密体強度は、図１の場合と同様の条件で測定した値である。図３のグラフの横軸の表面水分は、全水分から包蔵水分［ｍａｓｓ％］を減算した値に基づいており、全水分は、図１のグラフの場合と同様に測定したものである。包蔵水分は、ＪＩＳ　Ｍ　８８０３に規定されている方法や非特許文献１記載の方法で測定可能であり、何れの方法であっても概ね同じ値となる。なお、表面水分は、圧密成型前の石炭を乾燥するなどして、全水分を調整することで、５ｍａｓｓ％以上１２ｍａｓｓ％以下とすることができる。 FIG. 3 shows the relationship between the surface moisture [mass%] of coal and the compacted body strength [kPa] of coal, which is a management index of the present invention. The consolidated body strength on the vertical axis of the graph of FIG. 3 is a value measured under the same conditions as in FIG. The surface moisture on the horizontal axis of the graph of FIG. 3 is based on a value obtained by subtracting the stored moisture [mass%] from the total moisture, and the total moisture is measured in the same manner as in the graph of FIG. The embedded moisture can be measured by the method defined in JIS M 8803 or the method described in Non-Patent Document 1, and the values are almost the same regardless of which method is used. In addition, surface moisture can be made into 5 mass% or more and 12 mass% or less by adjusting the total water | moisture content, such as drying the coal before compaction molding.
　図３のグラフの横軸の表面水分は、非特許文献１記載の方法で測定した石炭の包蔵水分を、測定した全水分から減算して算出される水分量［ｍａｓｓ％］である。なお、石炭Ａでは包蔵水分は３．４７ｍａｓｓ％、石炭Ｂでは５．１１ｍａｓｓ％、石炭Ｃでは３．３２ｍａｓｓ％となる。 The surface moisture on the horizontal axis of the graph of FIG. 3 is a moisture amount [mass%] calculated by subtracting the coal-containing moisture measured by the method described in Non-Patent Document 1 from the measured total moisture. Coal A has a moisture content of 3.47 mass%, coal B has 5.11 mass%, and coal C has 3.32 mass%.
　図３からわかるように、図１と同様に、石炭の銘柄によっては、圧密体強度自体は異なっており、例えば、石炭Ｃは、石炭Ａ及びＢに比べて圧密体強度が高い。しかしながら、圧密体強度を高位とする石炭の表面水分の範囲は、石炭Ａ～Ｃのいずれの銘柄の石炭であっても５ｍａｓｓ％以上１２ｍａｓｓ％以下と、同じである。表面水分が１２ｍａｓｓ％を超えると、水分が圧密成型物に過剰に存在することになり、圧密による力の一部が石炭間の水の排出に働いてしまい、残りの力のみが圧密成型物の嵩密度の増加に働くことになる。よって、圧密成型物の嵩密度が増加しにくく、圧密体強度が向上しないものと推察される。表面水分が５ｍａｓｓ％未満では、表面水分は、圧密成型物中のバインダーの機能を果たしにくいと推察される。なお、圧密体強度を高位とするための石炭の表面水分の範囲は、６ｍａｓｓ％以上１１ｍａｓｓ％以下とすることがより好ましく、７ｍａｓｓ％以上１０ｍａｓｓ％以下とすることがさらに好ましい。 As can be seen from FIG. 3, as in FIG. 1, depending on the brand of coal, the compacted body strength itself is different. For example, coal C has a higher compacted body strength than coals A and B. However, the range of the surface moisture of the coal with a high compacted body strength is the same as 5 mass% or more and 12 mass% or less for any brand of coal A to C. If the surface moisture exceeds 12 mass%, moisture will be excessively present in the compacted product, and part of the force due to compaction will work to discharge water between coals, and only the remaining force will be in the compacted product. This will increase the bulk density. Therefore, it is presumed that the bulk density of the compacted product is difficult to increase and the compact strength is not improved. If the surface moisture is less than 5 mass%, it is presumed that the surface moisture hardly fulfills the function of the binder in the compacted product. In addition, the range of the surface moisture of coal for increasing the compacted body strength is more preferably 6 mass% or more and 11 mass% or less, and further preferably 7 mass% or more and 10 mass% or less.
　圧密成型の対象の石炭を、２銘柄以上の石炭あるいは２銘柄以上の石炭と粘結材を含む配合炭としてもよい。この場合、配合炭の包蔵水分に基づいて、配合炭の表面水分を算出することになる。配合炭の包蔵水分については、実際に、配合炭の包蔵水分を測定してもよい。また、配合炭中の各銘柄の石炭あるいは粘結材の包蔵水分を測定し、各銘柄の石炭あるいは粘結材の配合割合［ｍａｓｓ％］を重みとした、各銘柄の石炭あるいは粘結材の包蔵水分の加重平均値を、配合炭の包蔵水分としてもよい。粘結材は、例えば、アスファルトピッチなどが挙げられ、粘結材の包蔵水分は、石炭と同様に、ＪＩＳ　Ｍ　８８０３に規定されている方法や非特許文献１記載の方法で測定可能である。また、配合炭の全水分については、図１のグラフを作成した場合と同様に測定することが可能である。配合炭の全水分から、算出あるいは測定した配合炭の包蔵水分を減算することで、配合炭の表面水分を求めることができる。 The coal to be compacted may be two or more brands of coal or a blended coal containing two or more brands of coal and a binder. In this case, the surface moisture of the blended coal is calculated based on the stored moisture of the blended coal. Regarding the stored moisture of the blended coal, the stored moisture of the blended coal may actually be measured. In addition, the moisture content of each brand of coal or binder in the blended coal is measured, and the weight of the blend ratio [mass%] of each brand of coal or binder is the weight of each brand of coal or binder. The weighted average value of the stored moisture may be the stored moisture of the blended coal. Examples of the binder include asphalt pitch, and the moisture contained in the binder can be measured by a method defined in JIS M 8803 or a method described in Non-Patent Document 1, similarly to coal. Moreover, about the total water | moisture content of a coal blend, it is possible to measure similarly to the case where the graph of FIG. 1 is created. By subtracting the calculated or measured stored moisture of the blended coal from the total moisture of the blended coal, the surface moisture of the blended coal can be obtained.
　次に、本発明者らは、圧密成型の対象の石炭を配合炭とした場合における表面水分［ｍａｓｓ％］と、配合炭の圧密体強度［ｋＰａ］との関係を調査した。性状がそれぞれ異なる石炭Ｂ～Ｈから構成される配合炭１及び配合炭２を作製した。石炭Ｂ～Ｉについて、ビトリニットの平均最大反射率Ｒｏ［％］、ギーセラー最高流動度ＭＦ［ｄｄｐｍ］、全イナート量ＴＩ［体積％］、及び、包蔵水分、で表される石炭の性状を表２に示す。 Next, the present inventors investigated the relationship between the surface moisture [mass%] and the compacted body strength [kPa] of the blended coal when the coal to be compacted was blended coal. Blended coal 1 and blended coal 2 composed of coals B to H having different properties were produced. For coals B to I, the properties of coal represented by vitrinite average maximum reflectance Ro [%], Gieseller maximum fluidity MF [ddpm], total inert amount TI [volume%], and stored moisture are shown in Table 2. Shown in
Figure JPOXMLDOC01-appb-T000002
 　配合炭１及び配合炭２の両方とも、ビトリニットの平均最大反射率Ｒｏ［％］、ギーセラー最高流動度ＭＦ［ｄｄｐｍ］、全イナート量ＴＩ［体積％］が同じとなるように、石炭Ｂ～Ｈを選択し、これらの配合割合を調整した。配合炭１及び配合炭２について、平均最大反射率Ｒｏを１．０２％、ギーセラー最高流動度ＭＦを、常用対数値で２．２０ｌｏｇｄｄｐｍ、全イナート量ＴＩを３５．０体積％とした。
Figure JPOXMLDOC01-appb-T000002
 Both Coal Coal 1 and Coal Coal 2 have coal B to H so that the average maximum reflectance Ro [%] of Vitrinite, Gieseler maximum fluidity MF [ddpm] and total inert amount TI [volume%] are the same. Was selected, and the blending ratio of these was adjusted. For blended coal 1 and blended coal 2, the average maximum reflectance Ro was 1.02%, the Gieseler maximum fluidity MF was 2.20 logddpm in common logarithm, and the total inert amount TI was 35.0% by volume.
　配合炭１及び配合炭２の各銘柄の石炭の配合割合［ｍａｓｓ％］と、配合炭１及び配合炭２についての包蔵水分と、を表３に示す。包蔵水分については、直接測定した値と、配合割合を重みとして石炭Ｂ～Ｈの包蔵水分を加重平均して算出された加重平均値と、が示してある。包蔵水分の直接測定した値は、非特許文献１記載の方法で測定した値である。 Table 3 shows the blending ratio [mass%] of coal of each brand of blended coal 1 and blended coal 2 and the moisture content of blended coal 1 and blended coal 2. As for the stored moisture, a directly measured value and a weighted average value calculated by weighted averaging of the stored moisture of coals B to H with the blending ratio as a weight are shown. The directly measured value of the stored moisture is a value measured by the method described in Non-Patent Document 1.
Figure JPOXMLDOC01-appb-T000003
 　配合炭の表面水分［ｍａｓｓ％］と、配合炭の圧密体強度［ｋＰａ］と、の関係を図４に示す。図４のグラフの縦軸の圧密体強度は、図１の場合と同様に、配合炭１及び配合炭２の圧密体強度を測定した値である。また、図４のグラフの横軸の表面水分は、配合炭１及び配合炭２の全水分を、図１のグラフの場合と同様に測定し、次いで、測定した全水分から、測定した包蔵水分を減算して算出される値［ｍａｓｓ％］である。
Figure JPOXMLDOC01-appb-T000003
 FIG. 4 shows the relationship between the surface moisture [mass%] of the blended coal and the compacted body strength [kPa] of the blended coal. The compacted body strength on the vertical axis of the graph of FIG. 4 is a value obtained by measuring the compacted body strength of the blended coal 1 and blended coal 2 as in the case of FIG. Moreover, the surface water | moisture content of the horizontal axis of the graph of FIG. 4 measured the total water | moisture content of the blended coal 1 and the blended coal 2 similarly to the case of the graph of FIG. Is a value [mass%] calculated by subtracting.
　図４のグラフからわかるように、図３の場合と同様に、配合炭１及び配合炭２においても、表面水分が５ｍａｓｓ以上１２ｍａｓｓ％以下であれば、圧密体強度が高位に維持されていることがわかる。また、配合炭１及び配合炭２においても圧密体強度を高位とするための石炭の表面水分の範囲は、６ｍａｓｓ％以上１１ｍａｓｓ％以下とすることがより好ましく、７ｍａｓｓ％以上１０ｍａｓｓ％以下とすることがさらに好ましい。
なお、包蔵水分について、表３に示すように、直接測定された値と加重平均で算出された値とは概ね同じである。よって、図４のグラフの横軸の表面水分を、加重平均で算出された値を包蔵水分に採用して算出したとしても、その算出した表面水分は、図４のグラフの表面水分と概ね同じ値となる。 As can be seen from the graph of FIG. 4, in the case of the blended coal 1 and the blended coal 2 as in the case of FIG. 3, if the surface moisture is 5 mass or more and 12 mass% or less, the compact body strength is maintained at a high level. I understand. Further, in the blended coal 1 and the blended coal 2, the range of the surface moisture of the coal for increasing the compact body strength is more preferably 6 mass% or more and 11 mass% or less, and 7 mass% or more and 10 mass% or less. Is more preferable.
In addition, as shown in Table 3, the value measured directly and the value calculated by the weighted average are almost the same for the stored moisture. Therefore, even if the surface moisture on the horizontal axis of the graph of FIG. 4 is calculated by adopting the value calculated by weighted average as the stored moisture, the calculated surface moisture is substantially the same as the surface moisture of the graph of FIG. Value.
　本発明の圧密成型物を製造する方法においては、石炭にバインダーを必ずしも加える必要はない。図３及び４のグラフからわかるように、バインダーを石炭に加えなくても、石炭の圧密成型物の強度をある程度高位に維持することが可能であることがわかる。 In the method for producing a compacted product of the present invention, it is not always necessary to add a binder to coal. As can be seen from the graphs of FIGS. 3 and 4, it can be seen that the strength of the compacted molded product of coal can be maintained at a certain level without adding a binder to the coal.
　圧密成型物の幅と高さは、コークス炉の炭化室の幅および高さより小さければよく、圧密成型物の幅は炭化室の幅の１／４～１／３程度でもよく、３～４個の圧密成型物を同じ炭化室に順次装入してもよい。また、圧密成型物の幅と高さを概ね炭化室の幅および高さに近づけて、１個の圧密成型物を炭化室に装入してもよい。 The width and height of the compacted product need only be smaller than the width and height of the carbonization chamber of the coke oven, and the width of the compacted product may be about 1/4 to 1/3 of the width of the carbonization chamber. These compacted moldings may be sequentially charged into the same carbonization chamber. Alternatively, one compacted product may be charged into the carbonization chamber with the width and height of the compacted product being approximately similar to the width and height of the carbonization chamber.
　圧密成型物の密度が、乾留基準で１．０～１．２トン／ｍ３となるように石炭を圧密成型し、該圧密成型物をコークス炉の炭化室に装入し、乾留して高炉用コークスを製造すれば、強度の高い高炉用コークスを製造することが可能である。 The coal is compacted so that the density of the compacted product is 1.0 to 1.2 ton / m 3 on the basis of dry distillation, and the compacted product is charged into the carbonization chamber of the coke oven and dry-distilled to form a blast furnace. If coke is manufactured, high strength blast furnace coke can be manufactured.
　成型される石炭は所定の粒度分布を有していることが好ましい。石炭の粒度分布は、非特許文献２に記載のＲｏｓｉｎ－Ｒａｍｍｌｅｒ分布に従うことが知られている。Ｒｏｓｉｎ－Ｒａｍｍｌｅｒの式は以下の式［２］で表される。 It is preferable that the coal to be molded has a predetermined particle size distribution. It is known that the particle size distribution of coal follows the Rosin-Rammler distribution described in Non-Patent Document 2. The Rosin-Rammler equation is expressed by the following equation [2].
　Ｐ＝１００ｅｘｐ（－Ｄｐ／ａ）ｂ　　［２］
　ここで、Ｄｐは、石炭の粒子の粒径、Ｐは、粒径Ｄｐ以上の粒子の割合、ａ、ｂは定数である。定数ｂは均等数と呼ばれ、粉体の粒度分布の指数である。均等数が大きくなると粒度分布の幅が狭くなる。 P = 100exp (−D p / a) b [2]
Here, Dp is the particle diameter of the coal particles, P is the ratio of particles having a particle diameter Dp or more, and a and b are constants. The constant b is called an equal number and is an index of the particle size distribution of the powder. As the uniform number increases, the width of the particle size distribution decreases.
　定数ｂの求め方については、実験により、常用対数ｌｏｇＤｐとｌｏｇ｛ｌｏｇ（１００／Ｐ）｝を求め、横軸にｌｏｇＤｐ、縦軸にｌｏｇ｛ｌｏｇ（１００／Ｐ）｝を取り、近似直線を求める。この近似直線の傾きが定数ｂとなる。近似直線を求める手段としては、最小二乗法などを使用することができる。 The method of obtaining the constants b, by experiment, determine the common logarithm logD p and log {log (100 / P) } , taking the log {log (100 / P) } in the horizontal axis logD p, the vertical axis, approximate Find a straight line. The slope of this approximate line is a constant b. As a means for obtaining the approximate straight line, a least square method or the like can be used.
　広い幅の粒度分布を持つ粉体は、狭い幅を持つ粉体と比較して嵩密度が増加しやすいので、ｂの値が小さい石炭ほど嵩密度は増加しやすい。しかしながら、ｂの値が小さくなり過ぎると、粗粒が増加し、嵩密度が増加しても強度が低下するので、高強度な圧密成型物を製造するためのｂの値には最適値が存在すると推察できる。 Since powder having a wide particle size distribution tends to increase in bulk density compared to powder having narrow width, the bulk density tends to increase as the value of b is smaller. However, if the value of b becomes too small, coarse grains increase and the strength decreases even if the bulk density increases, so there is an optimum value for the value of b for producing a high-strength compacted product. Then we can guess.
　また、粉体圧縮時の充填性を表す粒度分布関数として、非特許文献３記載のＡｎｄｒｅａｓｅｎの式が知られている。Ａｎｄｒｅａｓｅｎの式は以下の式［３］で表される。 Also, the Andreasen equation described in Non-Patent Document 3 is known as a particle size distribution function representing the filling property during powder compression. The Andreasen equation is expressed by the following equation [3].
　１００－Ｐ＝１００（Ｄｐ／Ｄｐ，ｍａｘ）ｍ　　［３］
　ここで、Ｄｐは、石炭の粒子の粒径、Ｐは、粒径Ｄｐ以上の粒子の割合、Ｄｐ，ｍａｘは、粒子の最大粒径、ｍは、Ｆｕｌｌｅｒ指数と呼ばれる粒度分布の指数であり、粒度分布の幅が広い場合、Ｆｕｌｌｅｒ指数の値は小さくなる。非特許文献３には、Ｆｕｌｌｅｒ指数が０．５と０．３３の間にある場合に、圧密成型物は加圧により最大密度となると記載されている。 100−P = 100 (D p / D p, max ) m [3]
Here, D p is the particle size of coal particles, P is the ratio of particles having a particle size of D p or more, D p, max is the maximum particle size of particles, and m is an index of particle size distribution called Fuller index. When the particle size distribution is wide, the value of the Fuller index is small. Non-Patent Document 3 describes that when the Fuller index is between 0.5 and 0.33, the compacted product has a maximum density by pressing.
　本発明者らは、表１及び２の石炭を用いて調製した配合炭を用いて、粒度分布を変えた場合の成型物の強度を上記と同様の方法で調査した。用いた石炭の配合比率を表４に示す。 The present inventors investigated the strength of the molded product when the particle size distribution was changed using the blended coal prepared using the coals in Tables 1 and 2 in the same manner as described above. Table 4 shows the blending ratio of the coal used.
Figure JPOXMLDOC01-appb-T000004
 　配合炭３の平均最大反射率Ｒｏは１．００％、ギーセラー最高流動度ＭＦは、常用対数値で２．３９ｌｏｇｄｄｐｍ、全イナート量ＴＩは３０．０体積％となるように、配合炭４の平均最大反射率Ｒｏは１．００％、ギーセラー最高流動度ＭＦは、常用対数値で２．３０ｌｏｇｄｄｐｍ、全イナート量ＴＩは３０．０体積％となるように、複数銘柄の石炭を配合した。
Figure JPOXMLDOC01-appb-T000004
 The average maximum reflectivity Ro of the blended coal 3 is 1.00%, the ghiser cell maximum fluidity MF is 2.39 logddpm as a common logarithm, and the total inert amount TI is 30.0 vol%. Plural brands of coal were blended so that the maximum reflectance Ro was 1.00%, the Gieseler maximum fluidity MF was 2.30 logddpm in common logarithm, and the total inert amount TI was 30.0% by volume.
　表４に示す配合炭の粒度分布に基づいたＲｏｓｉｎ－Ｒａｍｍｌｅｒの式により求まる均等数と配合炭の圧密成型物強度との関係を図５に、配合炭の粒度分布に基づいたＡｎｄｒｅａｓｅｎの式により求まるＦｕｌｌｅｒ指数と配合炭の圧密成型物強度との関係を図６に示す。図５及び６のグラフによれば、配合炭３及び４の両方で、均等数が１．３を超えるもしくはＦｕｌｌｅｒ指数が０．７５を超える範囲では、それぞれの指数の低下に伴い圧密成型物強度は増加していき、均等数が０．７以上１．３以下もしくはＦｕｌｌｅｒ指数が０．３０以上０．７５以下の範囲では、圧密成型物強度は高位に維持されている。また、均等数が０．７を下回るもしくはＦｕｌｌｅｒ指数が０．７５を下回ると、圧密成型物強度は大幅に低下している。これらの結果から、圧密成型物は、均等数が０．７以上１．３以下の場合に高強度となり、Ｆｕｌｌｅｒ指数が０．３０以上０．７５以下の場合、高強度となることがわかった。なお、圧密成型物の強度高めるための均等数の範囲は、０．８以上１．２以下とすることがより好ましく、０．９以上１．１以下とすることがさらに好ましい。また、同様に、Ｆｕｌｌｅｒ指数の範囲は、０．４０以上０．６５以下とすることがより好ましく、０．５０以上０．５５以下とすることがさらに好ましい。 FIG. 5 shows the relationship between the equivalent number obtained from the Rosin-Rammler equation based on the particle size distribution of the blended coal shown in Table 4 and the strength of the compacted product of the blended coal, and the Andreasen equation based on the particle size distribution of the blended coal FIG. 6 shows the relationship between the Fuller index and the strength of the compacted molded product of the blended coal. According to the graphs of FIGS. 5 and 6, in both the blended coals 3 and 4, in the range where the even number exceeds 1.3 or the Fuller index exceeds 0.75, the strength of the compacted molded product as the index decreases. In the range where the uniform number is 0.7 or more and 1.3 or less or the Fuller index is 0.30 or more and 0.75 or less, the strength of the compacted molded product is maintained at a high level. On the other hand, when the uniform number is less than 0.7 or the Fuller index is less than 0.75, the strength of the compacted product is greatly reduced. From these results, it was found that the compacted product has high strength when the uniform number is 0.7 or more and 1.3 or less, and has high strength when the Fuller index is 0.30 or more and 0.75 or less. . The range of the uniform number for increasing the strength of the compacted product is more preferably 0.8 or more and 1.2 or less, and further preferably 0.9 or more and 1.1 or less. Similarly, the range of the Fuller index is more preferably 0.40 or more and 0.65 or less, and further preferably 0.50 or more and 0.55 or less.
　様々な銘柄の石炭を圧密成型する場合であっても、石炭の表面水分を５ｍａｓｓ以上１２ｍａｓｓ％以下とすれば、石炭の圧密成型物の強度を確実に向上させることが可能となる。これにより、石炭の圧密成型物を崩壊させることなく、炭化室に装入することが可能となり、強度の高い高炉用コークスを製造することができる。また、様々な銘柄の石炭を圧密成型する場合であっても、石炭は、所定の粒度分布を有している方がより好ましい。 Even when various brands of coal are compacted, if the surface moisture of the coal is 5 mass% or more and 12 mass% or less, the strength of the coal compacted product can be reliably improved. Thereby, it becomes possible to insert into a carbonization chamber, without destroying the compacted product of coal, and to manufacture high strength blast furnace coke. Even when various brands of coal are compacted, it is more preferable that the coal has a predetermined particle size distribution.
　１　石炭
　２　包蔵水分
　３　表面水分 1 Coal 2 Moisture content 3 Surface moisture

Claims (8)

  1. 　石炭を圧密成型し、圧密成型物を製造する方法であって、
    　前記石炭の全水分から包蔵水分を減算して求まる表面水分を５ｍａｓｓ％以上１２ｍａｓｓ％以下とすることを特徴とする石炭の圧密成型物の製造方法。     A method of compacting coal to produce a compacted product,
    A method for producing a compacted molded product of coal, wherein the surface moisture obtained by subtracting the stored moisture from the total moisture of the coal is 5 mass% or more and 12 mass% or less.
  2. 　前記石炭は、２銘柄以上の石炭あるいは２銘柄以上の石炭と粘結材を含む配合炭であることを特徴とする請求項１に記載の石炭の圧密成型物の製造方法。 2. The method for producing a compacted product of coal according to claim 1, wherein the coal is two or more brands of coal or a blended coal containing two or more brands of coal and a binder.
  3. 　前記全水分及び前記包蔵水分を測定して前記表面水分を求めることを特徴とする請求項１または請求項２に記載の石炭の圧密成型物の製造方法。 3. The method for producing a compacted product of coal according to claim 1 or 2, wherein the surface moisture is obtained by measuring the total moisture and the embedded moisture.
  4. 　前記配合炭の全水分を測定し、
    　各銘柄の石炭あるいは粘結材の包蔵水分を測定し、
    　各銘柄の石炭あるいは粘結材の配合割合を重みとして、測定された包蔵水分を加重平均して加重平均値を得、
    　前記配合炭の全水分から前記加重平均値を減算して、前記配合炭の表面水分を求めることを特徴とする請求項２に記載の石炭の圧密成型物の製造方法。     Measure the total moisture of the blended coal,
    Measure the moisture content of each brand of coal or binder,
    Weighted average of the stored moisture was obtained by weighting the blending ratio of coal or binder of each brand,
    The method for producing a compacted product of coal according to claim 2, wherein the surface moisture of the blended coal is obtained by subtracting the weighted average value from the total moisture of the blended coal.
  5. 　前記圧密成型物の密度が乾留基準で１．０～１．２トン／ｍ３となるように石炭を圧密成型することを特徴とする請求項１～４のいずれか１項に記載の石炭の圧密成型物の製造方法。 The coal according to any one of claims 1 to 4, wherein the coal is compacted so that a density of the compacted product is 1.0 to 1.2 ton / m 3 on a dry distillation basis. A method for producing a compacted product.
  6. 　前記圧密成型される石炭は、Ｒｏｓｉｎ－Ｒａｍｍｌｅｒ分布の均等数が０．７０以上１．３０以下となる粒度分布を有することを特徴とする請求項１～５のいずれか１項に記載の石炭の圧密成型物の製造方法。 The coal according to any one of claims 1 to 5, wherein the coal to be compacted has a particle size distribution in which an equal number of Rosin-Rammler distributions is 0.70 or more and 1.30 or less. A method for producing a compacted product.
  7. 　前記圧密成型される石炭は、Ａｎｄｒｅａｓｅｎ分布のＦｕｌｌｅｒ指数が０．３０以上０．７５以下となる粒度分布を有することを特徴とする請求項１～６のいずれか１項に記載の石炭の圧密成型物の製造方法。 7. The compacted coal according to claim 1, wherein the compacted coal has a particle size distribution in which the Fullersen distribution has a Fuller index of 0.30 to 0.75. Manufacturing method.
  8. 　高炉用コークスの製造方法であって、
    　請求項１～７のいずれか１項に記載の石炭の圧密成型物の製造方法で製造された圧密成型物をコークス炉の炭化室に装入し、
    　前記圧密成型物を乾留して高炉用コークスを製造することを特徴とする高炉用コークスの製造方法。     A method for producing coke for blast furnace,
    A compacted product manufactured by the method for manufacturing a compacted product of coal according to any one of claims 1 to 7 is charged into a carbonization chamber of a coke oven,
    A method for producing coke for blast furnace, wherein the compacted product is subjected to dry distillation to produce coke for blast furnace.
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