WO2025057471A1 - コークスの製造方法 - Google Patents

コークスの製造方法 Download PDF

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Publication number
WO2025057471A1
WO2025057471A1 PCT/JP2024/016347 JP2024016347W WO2025057471A1 WO 2025057471 A1 WO2025057471 A1 WO 2025057471A1 JP 2024016347 W JP2024016347 W JP 2024016347W WO 2025057471 A1 WO2025057471 A1 WO 2025057471A1
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Prior art keywords
biomass
coke
mass
coal
strength
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English (en)
French (fr)
Japanese (ja)
Inventor
佑哉 河合
孝徳 ▲高▼嶋
勇介 土肥
哲也 山本
貴 松井
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JFE Steel Corp
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JFE Steel Corp
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Priority to AU2024343090A priority Critical patent/AU2024343090A1/en
Priority to EP24864980.8A priority patent/EP4737536A1/en
Priority to JP2024553505A priority patent/JPWO2025057471A1/ja
Publication of WO2025057471A1 publication Critical patent/WO2025057471A1/ja
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
    • C10B53/00—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form
    • C10B53/02—Destructive distillation, specially adapted for particular solid raw materials or solid raw materials in special form of cellulose-containing material
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E50/00—Technologies for the production of fuel of non-fossil origin
    • Y02E50/10—Biofuels, e.g. bio-diesel

Definitions

  • the present invention relates to a method for producing coke that uses biomass as part of the raw material.
  • Coke is a carbon-based lump-shaped product obtained by carbonizing coal.
  • Coke used in blast furnaces functions as a heat source and reducing agent, as well as a support material that ensures air circulation and liquid permeability inside the blast furnace. Therefore, lump coke is required to have mechanical strength in order to ensure stable operation of the blast furnace.
  • a coal blend consisting of several types of coal mixed in a specific ratio is used.
  • the coal blend is either directly or molded and then carbonized at a temperature of 1000°C or higher to obtain lump-shaped coke in which the coal is bonded together.
  • caking coal which has the property of easily softening and melting, as part of the coal blend, it is possible to obtain coke with high strength.
  • Ro average maximum reflectance of vitrinite
  • MF maximum fluidity
  • Patent Document 1 describes a method for producing coke in which woody biomass material that has been heat-treated at over 300 to 400°C is mixed with coal and carbonized in a coke oven.
  • Patent Document 2 describes a method for producing highly reactive coke for blast furnaces in which biomass is heated to at least 1000°C or higher to cause pyrolysis, and the resulting biomass char, which is a solid component with a diameter of 1 mm or less, is added to blended coal.
  • Ro and MF are effective indicators for managing coke strength, but both are indicators that are based on the assumption that they are measured for coal. For this reason, even if one attempts to measure Ro and MF for a sample consisting only of raw materials derived from biomass, it is either impossible to perform the measurement due to the large difference in properties between coal and biomass, or even if it were possible to measure, the measured value cannot be used as an indicator for managing coke strength. Therefore, a new indicator for managing coke strength is needed.
  • the present invention was made in consideration of the above problems, and its purpose is to present new indicators for biomass-derived raw materials that can replace part of the coal used to produce coke for blast furnaces, and to provide a means for producing high-strength coke even when biomass-derived raw materials are blended with coal.
  • the inventors also investigated the micro strength index, an index of microscopic strength, for various types of biomass-derived raw materials and discovered that the micro strength index varies greatly depending on the type of biomass used as raw material. They then discovered that by using the biomass micro strength index as a new index and selectively using biomass that is suitable for blending with blended coal, it is possible to suppress the decrease in coke strength, thus completing the present invention.
  • a method for producing coke characterized in that a test coke obtained by carbonizing the biomass alone has a micro strength index of 45 or more.
  • the micro strength index is 60 or more.
  • the temperature for carbonizing the test coke is 1000 ° C.
  • the volatile content of the biomass on a water-free basis is 6.0% by mass or more.
  • the biomass includes at least one of palm kernel shells and woody biomass, A method for producing coke described in any one of [1] to [4] above.
  • the biomass is carbonized biomass obtained by heat-treating unheated biomass.
  • the ratio of the biomass in the mixture is 1.0% by mass or more and 10% by mass or less, A method for producing coke described in any one of [1] to [6] above.
  • the proportion of biomass having a particle size of 3.0 mm or less in the biomass is 70% by mass or more, and the proportion of coal blend having a particle size of 3.0 mm or less in the coal blend is 70% by mass or more.
  • the present invention clarifies the properties of biomass-derived raw materials suitable for replacing part of the coal used in the production of coke for blast furnaces. This makes it possible to produce high-strength coke even when biomass-derived raw materials are blended with coal. It also makes it possible to reduce carbon dioxide emissions derived from fossil fuels.
  • FIG. 1 is a schematic diagram showing an example of a test device for applying a mechanical shock.
  • the method for producing coke according to the present invention is characterized in that when biomass is mixed with blended coal for coke production in a predetermined ratio to produce a mixture, and the mixture is carbonized to produce coke, the micro strength index of a test coke obtained by carbonizing the biomass alone is 45 or more.
  • biomass refers to organic industrial resources derived from plants and animals that exist in the current ecosystem.
  • the organic matter that constitutes biomass circulates within the ecosystem while changing its form.
  • the carbon dioxide generated when biomass is burned originates from the carbon that was originally absorbed into the living organisms of plants and animals when they grew, so it does not affect the increase or decrease of the total amount of carbon dioxide in the atmosphere and is considered to be in a so-called carbon neutral state.
  • the carbon dioxide generated when fossil fuels are burned originates from underground resources isolated from the current ecosystem and is therefore not considered to be in a carbon neutral state. Therefore, fossil fuels such as coal and oil are not included in the biomass in this embodiment.
  • the biomass used in this embodiment may be any type of biomass that can be used as an industrial resource among products produced in fields such as agriculture, forestry, livestock farming, and fisheries, and waste generated during the production process, as long as it satisfies the specified conditions described below.
  • the biomass includes at least one of palm kernel shells and woody biomass.
  • Palm kernel shells are biomass produced as a by-product after extracting coconut oil from palm kernels. They are suitable as biomass for use in this embodiment because they are inexpensive and have moderate strength.
  • Examples of woody biomass include biomass made of wood from coniferous trees such as cedar, pine, and cypress, and broad-leaved trees such as zelkova, birch, and eucalyptus. The part of the wood is not limited.
  • Woody biomass also includes unused parts such as waste wood from construction and papermaking, and thinning wood generated in forestry. Sawdust produced during lumber manufacturing is a typical example of woody biomass.
  • the particle size of the biomass is such that the proportion of particles of 3.0 mm or less is 70% by mass or more and 100% by mass or less. If the proportion of particles of 3.0 mm or less is 70% by mass or more and 100% by mass or less, it can be homogeneously mixed with the blended coal. A more preferable particle size range is 100% by mass of particles of 3.0 mm or less. There is no lower limit for the particle size. In other words, the particle size may be any size greater than 0 (zero).
  • the proportion of biomass with particle sizes of 3.0 mm or less is less than 70% by mass
  • the proportion of particle sizes of 3.0 mm can be adjusted to 70% by mass or more and 100% by mass or less by crushing the biomass.
  • the particle size adjustment by crushing may be performed on the biomass, on the carbonized biomass described below, or on both.
  • a known crusher can be used to crush the biomass or carbonized biomass.
  • powder size corresponds to the nominal mesh size of a test sieve as specified in Japanese Industrial Standards Z 8801-1:2019 "Test sieves - Part 1: Metal mesh sieves.”
  • powders and granular materials with a particle size larger than X mm are powders and granular materials that remain on a sieve with a nominal mesh size of X mm when sieved through a sieve.
  • Powders and granular materials with a particle size of Y mm or less are powders and granular materials that fall through a sieve with a nominal mesh size of Y mm when sieved through a sieve.
  • the yield can be increased and production costs can be reduced by omitting the steps of sieving or adjusting the particle size by crushing, or both.
  • the proportion of biomass with a particle size of 3.0 mm or less in the particle size distribution of biomass based on mass is preferably 70 mass% or more.
  • the proportion of biomass with a particle size of 3.0 mm or less is more preferably 80 mass% or more, and even more preferably 90 mass% or more.
  • the upper limit of the proportion of biomass with a particle size of 3.0 mm or less is 100 mass%.
  • the particle size distribution of biomass based on mass can be determined by known methods, such as a method of measuring the weight of powder sieved through multiple sieves with different mesh openings for a sample taken from the large amount of biomass produced, or a method of irradiating a sample with a laser.
  • the crushability of the biomass can be improved by heat-treating unheated biomass to obtain carbonized biomass.
  • the biomass In heat treatment aimed at carbonizing biomass, the biomass is heat treated in an air-tight atmosphere.
  • heat treatment By performing heat treatment on biomass in an air-tight atmosphere, the progress of combustion of the biomass is hindered, and the biomass can be carbonized.
  • a container is prepared that prevents air from entering and forms a space through which an inert gas flows, and the biomass is loaded into the container and heat treated.
  • the temperature at which the biomass is heat-treated may be adjusted appropriately depending on the type of biomass so that the crushability and volatile content are in the appropriate range.
  • heat treatment temperature refers to the maximum temperature reached by the biomass when heat-treating.
  • the time for which heat treatment is performed varies depending on the type of biomass and the mass of biomass to be heat treated at one time, but is preferably 1 minute or more and 60 minutes or less. A more preferable heat treatment time is 10 minutes or more. A more preferable heat treatment time is 30 minutes or less.
  • heat treatment time refers to the time from when the temperature of the biomass during heat treatment reaches the temperature at which heat treatment is performed to when the heat treatment temperature is stopped being maintained.
  • a mixture obtained by blending a biomass in a predetermined ratio with a coal blend for producing coke is carbonized to produce coke.
  • the biomass blended in the coal blend may be unheated biomass or carbonized biomass obtained by heat treatment.
  • the coal blend may be any type of coal blend suitable for producing coke.
  • a coal blend suitable for producing coke refers to a coal blend that can produce high-strength coke by carbonizing only the coal blend as a raw material. Whether a coal blend is suitable for producing coke or not can be predicted from the Ro and MF values of the coal blend.
  • a coal blend containing caking coal is an example of a coal blend suitable for producing coke.
  • the proportion of the particle size of the coal blend used for coke production that is 3.0 mm or less is preferably 70% by mass or more and 100% by mass or less. If the particle size of the coal blend is coarse, a distribution of properties will occur in the production of coke using a mixture of coal components with different properties. Therefore, it is preferable that the proportion of the coal blend with a particle size of 3.0 mm or less is 70% by mass or more. More preferably, the proportion of the coal blend with a particle size of 3.0 mm or less is 75% by mass or more.
  • the proportion of the coal blend with a particle size of 3.0 mm or less is preferably 90% by mass or less, and more preferably 85% by mass or less.
  • the ratio of biomass in the mixture is 1.0 mass% or more, a significant effect in reducing carbon dioxide emissions can be obtained, and if it is 10 mass% or less, the strength of the obtained coke is not significantly reduced, so it is preferable that the ratio is 1.0 mass% or more and 10 mass% or less.
  • a more preferable ratio of biomass is 2.0 mass% or more and 7.0 mass% or less.
  • the mixture obtained by blending blended coal and biomass in a predetermined ratio may be sufficiently mixed without performing any special operation specialized for mixing.
  • Specific examples of such cases include when the mixture transported by a belt conveyor falls onto the next belt conveyor, when blended coal and biomass are blended and then pulverized using pulverizing equipment, and when blended coal and biomass are blended and then the moisture content is adjusted while stirring using coal moisture control equipment. In such cases, the equipment and costs required for mixing can be reduced, which is preferable.
  • the blended coal and biomass are mixed uniformly. This can prevent the problem of biomass that does not soften or melt when heated being unevenly concentrated in one place and remaining unsolidified even after the carbonization process.
  • a coal mixer can be used to mix the blended coal and biomass.
  • a coal mixer for example, a mixer that mainly performs convection mixing, a mixer that mainly performs shear mixing, or a mixer that performs a combination of convection mixing and shear mixing can be used.
  • convection mixing is mixing that mainly involves convection and diffusion of the sample
  • shear mixing is mixing that involves shearing, collision, grinding, etc. of the sample.
  • a mixture obtained by blending a biomass in a predetermined ratio with a blended coal for coke production is carbonized to produce coke.
  • the mixture is charged into a coke oven and carbonized by heating in an air-tight atmosphere.
  • the carbonization temperature is 900°C or higher, coke of sufficient strength will be obtained. 950°C or higher is more preferable.
  • the carbonization temperature is preferably 1250°C or lower, and more preferably 1100°C or lower.
  • carbonization temperature refers to the maximum temperature reached by the mixture during carbonization.
  • a test coke obtained by carbonizing biomass alone is pulverized, the resulting powder is classified into powder particles that pass through a sieve with a mesh size of 1.18 mm but do not pass through a sieve with a mesh size of 0.60 mm, and the classified powder particles are impacted, and in the mass particle size distribution, the micro strength index, which is the mass percentage of powder particles that do not pass through a sieve with a mesh size of 0.21 mm, is 45 or more.
  • the micro strength index thus obtained may be represented by the symbol MSI 0.21 .
  • a small amount of test coke for evaluating the micro strength index is prepared in addition to the mixture for producing coke.
  • the test coke can be obtained by carbonizing the biomass to be evaluated alone.
  • the biomass used to prepare the test coke has the same raw material type and heat treatment conditions as the biomass used to produce the coke.
  • the test coke is obtained by carbonizing a small amount of a sample taken from the biomass used to produce the coke alone.
  • the test coke is a sample corresponding to the portion of the coke produced by carbonizing the mixture that is derived from the biomass.
  • the maximum temperature among the carbonization conditions, has a large effect on the strength of the coke. Therefore, the maximum temperature when carbonizing the biomass to produce the test coke is preferably about the same as the carbonization temperature when producing the coke, and is preferably 900°C or higher and 1250°C or lower.
  • the temperature at which the test coke is carbonized is 1000°C. Carbonization at 1000°C allows the test coke to be sufficiently carbonized, making it suitable as a sample for evaluating the micro strength index.
  • An example of typical carbonization conditions other than temperature is as follows: After the biomass is filled into a crucible, the crucible is loaded into a heating furnace and heated in a nitrogen atmosphere until the sample temperature reaches 1000°C while controlling the temperature rise rate to 3°C per minute. The sample temperature is then maintained at 1000°C for 60 minutes to allow carbonization to proceed. The sample is then allowed to cool naturally in the furnace while still in the nitrogen atmosphere.
  • the micro strength index (MSI 0.21 ) is a value measured by the following measurement procedure.
  • the test coke after carbonization is crushed and classified into powder particles that pass through a sieve with a mesh size of 1.18 mm but do not pass through a sieve with a mesh size of 0.60 mm.
  • 2.0 g of the test coke sample obtained by classification and 12 steel balls with a diameter of 10.5 mm are placed in a cylindrical container with a diameter of 26 mm and a length of 305 mm and sealed.
  • the cylindrical container is rotated 800 times at 25 rpm to apply an impact to the test coke sample.
  • the sample after the test is removed from the cylindrical container, and the weight of the powder particles that do not pass through a sieve with a mesh size of 0.21 mm is calculated.
  • the weight is divided by the weight of the test coke sample used in the test to give a mass percentage, which is the micro strength index (MSI 0.21 ) in this embodiment.
  • FIG. 1 is a schematic diagram showing an example of a test device for applying an impact to a test coke.
  • This test device 1 comprises a cylindrical steel container 2, and a motor 3 and gear 4 for rotating the container 2.
  • the cylindrical container 2 has a rotation shaft located at the center of the cylinder's length. The rotation shaft is positioned so that it is perpendicular to the center line of the container 2, and its direction is fixed horizontally.
  • the motor 3 By rotating the motor 3, the container 2 rotates around the rotation shaft like an airplane propeller. As the container rotates, steel balls fall, applying an impact to the test coke inside the container.
  • the test coke can be crushed by a crusher or other known means.
  • the purpose of adjusting the particle size by crushing and classification is to eliminate the influence of macro defects such as cracks and large pores of a few mm in size that are present in the test coke before crushing on the measured values in the evaluation of the micro strength index.
  • macro defects such as cracks and large pores of a few mm in size that are present in the test coke before crushing on the measured values in the evaluation of the micro strength index.
  • the micro strength index measured using the crushed test coke is a good indicator of the strength of the matrix part of the test coke that is not affected by macro defects, i.e., the matrix strength.
  • the higher the micro strength index the higher the matrix strength of the test coke.
  • a sieve is used to classify powder or granular material.
  • the "mesh opening" of a sieve refers to the size of the gaps in the wire mesh. If the particle size (maximum particle size) of the powder or granular material is smaller than the mesh opening of the sieve, the powder or granular material passes through the sieve and falls, and if the particle size of the powder or granular material is larger than the mesh opening of the sieve, the powder or granular material does not pass through the sieve and remains on top of the sieve.
  • the particle size of the powder or granular material can be adjusted to a specified range.
  • a mesh is the number of lines or gaps per inch of wire mesh length. The higher the mesh number, the finer the mesh of the sieve. Even for sieves with the same mesh number, if the wires that make up the wire mesh are thick, the opening will be smaller than if the wires are thin. For example, a commercially available sieve with an opening of close to 1.20 mm has a mesh number of 14 meshes, but the opening will vary slightly depending on the thickness of the wires even for the same 14 mesh sieve. In this embodiment, a range is set for the opening, so a commercially available sieve with an opening that falls within this range can be selected and used.
  • the micro strength index is 45 or more.
  • the reason for setting the lower limit of the micro strength index at 45 is that the micro strength index measured under the same conditions for coke obtained by carbonizing a coal blend that does not contain biomass is approximately 45. If coke is produced using a mixture that is mixed with biomass having a micro strength index equal to or greater than the micro strength index of the coal blend, the progression of fracture originating from the parts derived from the biomass can be prevented. This improves the strength of the entire coke.
  • the micro strength index is preferably 60 or more.
  • the micro strength index defined in this embodiment varies depending on the type of biomass and the part used.
  • only biomass with a micro strength index of 45 or more which is the mass percentage of powder particles that do not pass through a sieve with a mesh size of 0.21 mm, is selected, and only the selected biomass is used in the mixing process and the carbonization process.
  • the type of biomass, the part used, and the production conditions may be adjusted so that the micro strength index is 45 or more. By using biomass that satisfies these conditions, coke with high strength can be produced.
  • the volatile content of the biomass on an anhydrous basis is 6.0 mass% or more.
  • the analysis of the volatile content of the biomass in this embodiment is performed in accordance with the method specified in Japanese Industrial Standards M 8812:2004 "Coals and cokes - Industrial analysis method".
  • the volatile content of the biomass is analyzed, and only biomass with a volatile content of 6.0% by mass or more is selected, and only the selected biomass is used in the mixing process and the carbonization process.
  • the conditions of the heat treatment in the carbonization process may be adjusted so that the volatile content is 6.0% by mass or more.
  • biomass with a volatile content of 6.0% by mass or more it is possible to produce coke with high strength.
  • the volatile content of the biomass on an anhydrous basis is 7.0% by mass or more, and in an even more preferred embodiment, it is 10% by mass or more.
  • the biomass-derived portion barely shrinks, while the surrounding coal-blend-derived portion shrinks, which is thought to result in stress being applied to the biomass-derived portion and breakage.
  • the biomass-derived portion and the surrounding coal-blend-derived portion shrink to the same extent because the volatile content of the biomass is 6.0% by mass or more. This is thought to suppress breakage of the biomass-derived portion and increase the strength of the coke.
  • the higher the heat treatment temperature of the biomass the less volatile matter contained in the biomass. This is thought to be because the higher the heat treatment temperature of the biomass, the more volatile matter is released from the biomass. Therefore, if the volatile matter measured for the biomass is less than 6.0 mass%, the heat treatment temperature of the biomass can be changed to a lower temperature, or the biomass can be not heat-treated at all, so that the volatile matter of the biomass is adjusted to 6.0 mass% or more.
  • the volatile matter can also be adjusted by changing the heat treatment time or the type of biomass used. Of these means, the means of changing the heat treatment temperature are preferred because they are easier to control.
  • the lower limit of the volatile content of the biomass on an anhydrous basis is 6.0% by mass or more, but there is no particular upper limit.
  • the volatile content of biomass that has not been subjected to any heat treatment is approximately 75% by mass, taking this into consideration, it is preferable that the volatile content does not exceed 80% by mass.
  • the effect of the present invention can be confirmed by evaluating the strength of the coke obtained by the coke manufacturing method according to the present embodiment.
  • evaluating the strength of coke There are various methods for evaluating the strength of coke, but among them, the method of evaluating the strength of coke by the rotational strength by the drum method specified in the Japanese Industrial Standards K 2151:2004 "Cokes - Test Methods" is a test that simulates the generation of powder from coke, which is a problem when used in a blast furnace, and is currently the most widely used in Japan, and is therefore preferable.
  • the drum method is a method in which a sample is inserted into a specified drum testing machine, rotated at a specified speed for a specified number of rotations, and then sieved through a specified sieve, the mass of each classification is determined, and the added percentage (%) of the sample is expressed as the drum strength index (symbol: DI).
  • the drum rotation speed was set to 150 rpm, and the ratio of the mass of coke that did not pass through a sieve with a mesh size of 15 mm after rotation to the mass of coke inserted into the drum testing machine was defined as the drum strength index (%).
  • the drum strength index indicates the mass ratio of coke that was not crushed to a size of 15 mm or less even when rotated in the drum testing machine. A higher DI value indicates a higher strength of the coke.
  • a coal blend with Ro of 1.0% and common logarithm of MF (log(MF/ddpm)) of 2.5 was prepared. This coal blend was pulverized to produce a coal blend with a particle size of 3.0 mm or less adjusted to 100% by mass.
  • This unheated biomass and carbonized biomass were pulverized to produce a biomass with a particle size of 3.0 mm or less adjusted to 100% by mass.
  • the obtained biomass was filled into a crucible, heated to 1000°C while controlling the temperature rise rate to 3°C per minute in a nitrogen atmosphere, and then carbonized at 1000°C for 60 minutes.
  • the mixture was then naturally cooled in a furnace in a nitrogen atmosphere to obtain a test coke.
  • the obtained test coke was crushed and classified to obtain a sample that passed through a sieve with a mesh size of 1.18 mm and did not pass through a sieve with a mesh size of 0.60 mm.
  • the micro strength index (MSI 0.21 ) of the test coke having the classified pre-test particle size was measured.
  • the volatile content of the same biomass on an anhydrous basis was also measured. The measured values are shown in Table 1.
  • the micro strength index was greater than 60.2 and less than 63.4, regardless of whether heat treatment was performed or not and the temperature of the heat treatment. These values were greater than the micro strength index of 45 for blended coal.
  • the volatile content was 74.6% for palm kernel shell that was not heat treated, and decreased as the heat treatment temperature increased. The volatile content was 6.0% when the heat treatment temperature was 700°C.
  • the micro strength index was greater than 13.8 and less than 14.6, regardless of the heat treatment temperature. The volatile content was 6.7% when the heat treatment temperature was 700°C.
  • the blended coal and biomass were blended so that the blending ratio of biomass in the mixture was 2.0%, 5.0%, or 7.0%, and the mixture was adjusted to have a moisture content of 8.0 mass%, and 16 kg of each mixture was prepared for each type of biomass.
  • the mixture was filled into a stainless steel container, inserted into an electric furnace through which nitrogen gas was circulated, heated, and carbonized.
  • the bulk density of the mixture in the container was 775 kg/m 3 on an anhydrous basis.
  • the container filled with the mixture was charged into an electric furnace set at a furnace wall temperature of 1050° C., and carbonized while maintaining the furnace wall temperature for 6 hours from the charging.
  • the container was then transferred to a cooling facility through which nitrogen gas at room temperature was circulated and cooled, and a coke containing biomass as a raw material was obtained.
  • a coke containing biomass as a raw material was obtained.
  • the drum strength index (DI) of the obtained coke was measured under the conditions of a drum rotation speed of 150 revolutions and a sieve opening of 15 mm. The measured values are shown in Table 2.
  • the cokes of Examples 1 to 9 which were mixed with biomass with a micro strength index of 45 or more, all showed a DI value of 77 or more.
  • This DI value means that the strength of the coke is strong enough to withstand use in a blast furnace.
  • These cokes have DI values closer to the values of the blended coals in the reference examples, and are cokes with particularly excellent strength.
  • the cokes of Comparative Examples 1 to 3 which showed low micro strength index values, showed a large decrease in the drum strength index. From these facts, it can be seen that the coke manufacturing method of the present invention can manufacture coke with higher strength based on more reliable predictions than the conventional technology.
  • the coke manufacturing method of the present invention makes it possible to produce coke with high strength that can withstand use in blast furnaces, even when part of the coal used to make the coke is replaced with a biomass-derived material.
  • Test device 2 Container 3 Motor 4 Gear

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PCT/JP2024/016347 2023-09-13 2024-04-25 コークスの製造方法 Pending WO2025057471A1 (ja)

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AU2024343090A AU2024343090A1 (en) 2023-09-13 2024-04-25 Method of producing coke
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JP2005272569A (ja) 2004-03-24 2005-10-06 Nippon Steel Corp 木質系バイオマスを用いた高炉用コークスの製造方法
WO2009001610A1 (ja) * 2007-06-22 2008-12-31 Nippon Petroleum Refining Co., Ltd. 石油コークスの製造方法
JP2014077086A (ja) 2012-10-11 2014-05-01 Nippon Steel & Sumitomo Metal 高炉用高反応性コークスの製造方法
JP2016079198A (ja) * 2014-10-10 2016-05-16 国立研究開発法人産業技術総合研究所 コークスの熱間反応後強度の推定方法
WO2019220808A1 (ja) * 2018-05-18 2019-11-21 株式会社神戸製鋼所 褐炭含有コークスの製造方法
KR20200113330A (ko) * 2019-03-25 2020-10-07 현대제철 주식회사 고강도 및 고반응성 코크스용 조성물 및 이를 이용한 코크스 제조방법

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005272569A (ja) 2004-03-24 2005-10-06 Nippon Steel Corp 木質系バイオマスを用いた高炉用コークスの製造方法
WO2009001610A1 (ja) * 2007-06-22 2008-12-31 Nippon Petroleum Refining Co., Ltd. 石油コークスの製造方法
JP2014077086A (ja) 2012-10-11 2014-05-01 Nippon Steel & Sumitomo Metal 高炉用高反応性コークスの製造方法
JP2016079198A (ja) * 2014-10-10 2016-05-16 国立研究開発法人産業技術総合研究所 コークスの熱間反応後強度の推定方法
WO2019220808A1 (ja) * 2018-05-18 2019-11-21 株式会社神戸製鋼所 褐炭含有コークスの製造方法
KR20200113330A (ko) * 2019-03-25 2020-10-07 현대제철 주식회사 고강도 및 고반응성 코크스용 조성물 및 이를 이용한 코크스 제조방법

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