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WO2025115362A1 - Procédé de production de coke - Google Patents

Procédé de production de coke Download PDF

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Publication number
WO2025115362A1
WO2025115362A1 PCT/JP2024/034001 JP2024034001W WO2025115362A1 WO 2025115362 A1 WO2025115362 A1 WO 2025115362A1 JP 2024034001 W JP2024034001 W JP 2024034001W WO 2025115362 A1 WO2025115362 A1 WO 2025115362A1
Authority
WO
WIPO (PCT)
Prior art keywords
carbonaceous material
coke
mass
coal
bulk density
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
PCT/JP2024/034001
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English (en)
Japanese (ja)
Inventor
佑哉 河合
勇介 土肥
大輔 井川
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
JFE Steel Corp
Original Assignee
JFE Steel Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by JFE Steel Corp filed Critical JFE Steel Corp
Priority to JP2024571975A priority Critical patent/JPWO2025115362A1/ja
Publication of WO2025115362A1 publication Critical patent/WO2025115362A1/fr
Pending legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • C10B57/00—Other carbonising or coking processes; Features of destructive distillation processes in general
    • C10B57/04—Other carbonising or coking processes; Features of destructive distillation processes in general using charges of special composition

Definitions

  • the present invention relates to a method for producing coke, and in particular to a method for producing coke that can improve the bulk density of a coal blend charged into a coke oven using normal raw materials for producing coke.
  • Blast furnace coke is used in the blast furnace as a reducing agent, a heat source, and a support material to maintain air permeability and liquid permeability.
  • a reducing agent e.g., a heat source
  • a support material e.g., a support material to maintain air permeability and liquid permeability.
  • coke strength e.g., rotational strength
  • Non-Patent Document 2 describes a method for improving the bulk density of coal that is gravity-charged, based on a preheated coal charging method in which coal is preheated and dried at a high temperature of about 200°C before being charged.
  • Patent Documents 1 and 2 also describe a method of improving the bulk density of coal by adding a bulk density improver to a coal blend.
  • the bulk density is improved by using additives that are generally known to be effective in improving slipperiness.
  • adding raw materials other than those used in normal coke production may reduce the coke quality, such as coke strength.
  • the present invention was made in consideration of the above problems, and its purpose is to provide a coke manufacturing method that does not require operations that pose a risk of fire and that can produce high-strength coke using raw materials used in normal coke manufacturing.
  • the inventors conducted intensive research to solve the above-mentioned problems and obtained the following findings. That is, they discovered that it is possible to improve the bulk density of a coal blend to be charged into a coke oven by finely pulverizing a portion of the carbonaceous material used in normal coke production and then mixing a small amount of the carbonaceous material with the crushed particle size used in normal coke production to prepare a coal blend.
  • the gist of the present invention which was completed based on the above findings, is as follows:
  • a method for producing coke by charging blended coal into a coke oven and carbonizing it comprising the steps of: A method for producing coke, comprising the steps of: preparing a coal blend by blending carbonaceous material A having a particle size of 3 mm or more at 10% by mass or more and a particle size of 0.5 mm or more at 60% by mass or more with carbonaceous material B having a particle size of 125 ⁇ m or less at 50% by mass or more in a ratio of 1% by mass or more and 10% by mass or less, wherein carbonaceous material B is one or a mixture of a plurality of types selected from coal, pitches, oil coke, and their dry distillates.
  • the present invention provides a coke manufacturing method that does not require any operations that pose a risk of fire and that can produce high-strength coke using raw materials normally used in coke manufacturing.
  • FIG. 2 is a cross-sectional view showing a schematic diagram of a bulk density measuring device used in a bulk density measurement test.
  • 1 is a graph showing the relationship between the blending ratio of carbonaceous material B in an embodiment and the strength difference ⁇ DI between the embodiment and a conventional example (No. 1) obtained by dry distilling only carbonaceous material A.
  • the method for producing coke according to the present invention is a method for producing coke by charging a coal blend into a coke oven and carbonizing it, and is characterized in that the coal blend is prepared by blending carbon material A having a ratio of 10% by mass to 30% by mass and a ratio of 0.5 mm or more having a particle size of 3 mm or more and 60% by mass or more of carbon material B having a ratio of 1% by mass to 10% by mass, and carbon material B having a ratio of 50% by mass or more of particle size of 125 ⁇ m or less, and the carbon material B is one or a mixture of multiple types selected from coal, pitches, oil coke, and carbonized products thereof.
  • the inventors believed that if the bulk density could be improved using the raw materials used in normal coke production by controlling the particle size distribution of the coal blend charged into the coke oven, then it would be possible to improve the bulk density of the charged coal blend without the adverse effects on coke quality caused by additives or the increased costs caused by using expensive chemicals. As a result of extensive research based on this idea, they discovered that by powdering some of the raw materials used in normal coke production before blending them, the powdered raw materials could act as a bulk density improver, improving the bulk density of the coal blend when it is charged.
  • the coke manufacturing method of the present invention is a technology that improves the bulk density of the coal blend when it is charged by pulverizing a portion of the coal blend used in normal coke manufacturing and then blending it.
  • the coal blend used in normal coke manufacturing is mainly composed of carbonaceous materials such as coal, pitches, oil coke, and their carbonized products.
  • a coal blend is prepared by mixing carbonaceous material A, which has a particle size of 3 mm or more at 10% to 30% by mass and a particle size of 0.5 mm or more at 60% by mass, with fine carbonaceous material B, which has a particle size of 125 ⁇ m or less at 50% by mass, in a ratio of 1% to 10% by mass.
  • the carbonaceous material A which has a ratio of particles of 3 mm or more of 10% by mass to 30% by mass to 60% by mass to particles of 0.5 mm or more, is the particle size used in normal coke production. Conventional knowledge has it that reducing the particle size of the coal blend reduces the bulk density of the coal blend charged into the coke oven. Therefore, in the present invention, the crushed particle size of the carbonaceous material A, which accounts for the majority of the coal blend, is controlled so that the ratio of particles of 3 mm or more is 10% by mass to 30% by mass.
  • the particle size of carbonaceous material A is controlled so that the proportion of particles of 3 mm or more is 30 mass% or less.
  • the particle size of carbonaceous material A is controlled so that the proportion of particles of 3 mm or more is 10 mass% or more.
  • the proportion of particles of 3 mm or more in the particle size of carbonaceous material A is 15 mass% or more and 25 mass% or less.
  • the particle size of carbonaceous material A there is no particular upper limit to the particle size of carbonaceous material A as long as the proportion of particles of 3 mm or more in the particle size of carbonaceous material A is 30 mass% or less, but from the viewpoint of preventing bias in the components, it is preferable to set it to 25 mm or less.
  • the particle size of carbonaceous material A is set to 60 mass% or more of 0.5 mm or more.
  • the proportion of particle sizes of 0.5 mm or more and less than 3 mm is set to 30 mass% or more and 90 mass% or less. It is also preferable that the proportion of particle sizes of 0.5 mm or more of carbonaceous material A is 80 mass% or less.
  • the proportion of fine particles with a particle size of less than 0.5 mm is less than 40 mass%, and preferably less than 20 mass%. If there are a lot of fine particles less than 0.5 mm during crushing, they can be removed by sieving, etc.
  • carbonaceous material B which has a particle size of 125 ⁇ m or less at 50% or more by mass, is a part of the carbonaceous material used in coke production, and is blended at a ratio of 1% to 10% by mass with respect to the entire coal blend.
  • carbonaceous material B which has an extremely low particle size relative to carbonaceous material A
  • the bulk density can be improved. Specifically, when the blended coal is charged into a coke oven, fine carbonaceous material B enters between the coarse carbonaceous material A, and functions as a lubricant, improving the slipperiness of the blended coal and improving the bulk density.
  • the blending ratio of carbonaceous material B is preferably 1% to 9% by mass, and more preferably 2% to 5% by mass.
  • the carbonaceous material B is a raw material used in ordinary coke production, and is one or a mixture of multiple materials selected from coal, pitches, oil coke, and their dry distillates.
  • the particle size adjustment method for the carbonaceous material B is not particularly specified as long as a predetermined particle size is obtained, but in order to finely pulverize the large amount of carbonaceous material used in coke production, equipment such as a roller mill or tower mill can be used.
  • the manufacturing cost of the carbonaceous material B can be reduced by reusing fine powdered carbonaceous material generated in steelworks.
  • Examples of fine powdered carbonaceous material generated in steelworks include pulverized coal pulverized for injection into blast furnaces, coke powder generated in coke dry quenching equipment (CDQ), and dust powder generated in dust collectors installed in the coal and coke transport process.
  • CDQ coke dry quenching equipment
  • carbonaceous material A can be mixed with carbonaceous material B in a ratio of 1% by mass to 10% by mass
  • the flow for crushing and mixing carbonaceous materials A and B is not specified, but it is possible to mix them, for example, in the following way.
  • carbonaceous material B Of the carbonaceous materials used in the blended coal, some or all of the multiple brands are finely crushed and blended to produce carbonaceous material B, and the other carbonaceous materials are crushed in a regular coke production mill to produce carbonaceous material A, which is then blended.
  • the carbonaceous material to be used in the blended coal is crushed in a crusher used for ordinary coke production, and after blending, a portion of the mixture is taken out and finely crushed to produce carbonaceous material B, which is then blended with the other carbonaceous material (carbonaceous material A).
  • the moisture content of the coal blend in the present invention is preferably 6% by mass or more and 9% by mass or less. If the moisture content of the coal blend is less than 6% by mass, the drying of the coal blend may increase the risk of fire and may also increase the amount of dust generated. On the other hand, if the moisture content of the coal blend is higher than 9% by mass, the increase in water may reduce the effect of improving bulk density by blending fine carbonaceous material B, and a large amount of heat is required to evaporate the water during carbonization in coke production, which is undesirable.
  • Table 1 shows the particle size of coal A, the particle size and blending ratio of coal B, and the moisture content of the coal blend used in the bulk density measurement test.
  • coal blend C is a coal blend with an average maximum vitrinite reflectance (Ro(-)) of 1.00 (%) and a common logarithm of the maximum fluidity (MF) of the Gieseler Plastometer (logMF) of 2.50.
  • Coal D is a raw coal with an Ro(-) of 0.98 (%) and a common logarithm of MF of 2.67
  • coal E is a general coal.
  • FIG. 1 is a cross-sectional view showing a schematic diagram of the bulk density measuring device used in the bulk density measurement test.
  • the bulk density measuring device 1 includes a sample hopper 2, a guide 3 installed at the bottom of the sample hopper, and a box-shaped container 4.
  • the guide 3 has an inlet diameter of 300 mm and an outlet diameter of 150 mm.
  • the container 4 is a rectangular box-shaped container with a width of 250 mm, a length of 250 mm (depth direction in Figure 1), and a height of 200 mm, and only the top surface is an opening.
  • a slide gate 5 is installed at the bottom of the sample hopper 2, and by opening the slide gate 5, the blended coal in the hopper 2 falls into the container 4 via the guide 3.
  • the height from the slide gate 5 installed at the bottom of the hopper 2 to the bottom of the container 4 is 2 m.
  • the bulk density of the various coal blends listed in Table 1 was measured using the bulk density measuring device described above. The procedure for measuring bulk density is described below.
  • carbonaceous material A and carbonaceous material B which had been prepared to have the particle sizes shown in Table 1, were blended, and water was added and mixed to obtain the moisture content shown in Table 1 to prepare a coal blend.
  • 32 kg of the coal blend was loaded into hopper 2, and then slide gate 5 was opened to drop the coal blend into container 4. After the coal blend had fallen, the coal blend that had protruded to the top of container 4 was removed, and the mass of the coal blend filled in the container was measured. After that, the weighed coal blend was divided into smaller portions to measure the moisture content, and the bulk density (dry basis, d.b.) of the coal blend was calculated using the following formula (1). Note that the bulk density was measured twice for each level, and the average of the two measurements was used as the bulk density for each level.
  • Table 1 shows the bulk density measurement results for each coal blend.
  • levels 1 to 4 which are conventional examples that do not contain fine carbonaceous material B
  • the bulk density decreases as the mass ratio of particles less than 3 mm increases, and as conventional knowledge, the bulk density decreases as the crushed particle size decreases.
  • levels 5 to 20 which are inventive examples in which fine carbonaceous material B is blended with carbonaceous material A
  • the bulk density is improved compared to the conventional example in which carbonaceous material B is not blended.
  • level 21 which is a comparative example in which the blending ratio of carbonaceous material B exceeds 10 mass%
  • the bulk density is lower than the conventional example (level 2) in which carbonaceous material B is not blended.
  • carbonaceous material B plays the role of a bulk density improver, and it is possible to improve the bulk density when the blended coal is charged.
  • the blended coal A and the carbonaceous material B which were prepared to have the particle size shown in Table 2, were blended in the blending ratio shown in Table 2, and then water was added and mixed to make the moisture content 7%, to prepare a blended coal for carbonization.
  • 16.5 kg of this blended coal was filled into a carbonization can with the bulk density shown in Table 2, and carbonized in an electric furnace. After carbonization for 6 hours at a furnace wall temperature of 1050°C, it was cooled under a nitrogen atmosphere, and the drum strength was measured using the obtained coke.
  • the drum strength DI_150/15 index was measured in accordance with the rotational strength test method of JIS K2151.
  • level 1 is a conventional example in which carbonaceous material B is not blended
  • levels 2 to 13 are invention examples in which carbonaceous material B is blended
  • level 14 is a comparative example in which the blending ratio of carbonaceous material B is outside the range of the present invention.
  • the bulk density at the time of carbonization for each level reflects the bulk density measurement results in Table 1.
  • ⁇ DI exceeds 0, indicating that the blending of carbonaceous material B improves the coke strength.
  • level 14 in which the blending ratio of carbonaceous material B is outside the range of the present invention, ⁇ DI is less than 0 and strength is reduced.
  • Figure 2 shows the relationship between the blending ratio of carbonaceous material B and ⁇ DI for the examples listed in Table 2. As shown in Figure 2, when the blending ratio of carbonaceous material B is in the range of 1 mass% to 10 mass%, the bulk density is improved and ⁇ DI exceeds 0.
  • the present invention provides a coke manufacturing method that does not require any operations that pose a risk of fire and that can produce high-strength coke using raw materials normally used in coke manufacturing.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Organic Chemistry (AREA)
  • Coke Industry (AREA)

Abstract

L'invention concerne un procédé de production de coke par lequel du coke à haute résistance peut être produit à l'aide d'une matière première pour la production de coke ordinaire, sans nécessiter une opération qui entraîne un risque d'incendie. L'invention concerne un procédé de production de coke par chargement de charbon mélangé dans un four à coke et carbonisation de celui-ci, le procédé étant caractérisé en ce que : le charbon mélangé est préparé par mélange compris entre 1 et 10 % en masse, inclus, d'un matériau carboné B, dans lequel le pourcentage de celui-ci ayant un diamètre de particule de 125 µm ou moins est de 50 % en masse ou plus, avec un matériau carboné A, dans lequel le pourcentage de celui-ci ayant un diamètre de particule de 3 mm ou plus est compris entre 10 et 30 % en masse, inclus, et le pourcentage de celui-ci ayant un diamètre de particule de 0,5 mm ou plus est de 60 % ; et le matériau carboné B est un mélange composé d'un ou de plusieurs types choisis parmi le charbon, le brai, le coke de pétrole et les produits de distillation à sec de ce qui précède.
PCT/JP2024/034001 2023-11-29 2024-09-24 Procédé de production de coke Pending WO2025115362A1 (fr)

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JP2024571975A JPWO2025115362A1 (fr) 2023-11-29 2024-09-24

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JP2023-202176 2023-11-29
JP2023202176 2023-11-29

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WO2025115362A1 true WO2025115362A1 (fr) 2025-06-05

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6040192A (ja) * 1983-08-12 1985-03-02 Kansai Coke & Chem Co Ltd 冶金用コ−クスの製造方法
JPS6069192A (ja) * 1983-09-26 1985-04-19 Kobe Steel Ltd 冶金用コ−クスの製造法
JPH04106193A (ja) * 1990-08-25 1992-04-08 Mitsubishi Kasei Corp コークス製造用原料炭の粒度管理方法
JP2007246593A (ja) * 2006-03-14 2007-09-27 Jfe Steel Kk コークスの製造方法

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6040192A (ja) * 1983-08-12 1985-03-02 Kansai Coke & Chem Co Ltd 冶金用コ−クスの製造方法
JPS6069192A (ja) * 1983-09-26 1985-04-19 Kobe Steel Ltd 冶金用コ−クスの製造法
JPH04106193A (ja) * 1990-08-25 1992-04-08 Mitsubishi Kasei Corp コークス製造用原料炭の粒度管理方法
JP2007246593A (ja) * 2006-03-14 2007-09-27 Jfe Steel Kk コークスの製造方法

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