Method for charging raw material to coke oven, and method for manufacturing coke

Abstract

To provide a technique capable of suppressing lowering of coke strength when blending synthetic resins.SOLUTION: A method for charging a raw material to a coke oven includes: when charging synthetic resins as a coke raw material to a coke oven together with raw material coal, charging the synthetic resins so that apparent density of synthetic resins among the raw material coal and the synthetic resins conveyed to the upper part of a coal tower is 0.70 g / cm3 or more; thereby separating fall positions of the synthetic resins and the raw material coal; and charging the synthetic resins so that the synthetic resins are unevenly distributed on a machine side and a coke side in the coal tower. A method for manufacturing a coke includes: when charging a coke raw material in a coal tower through a coal loading vehicle, carbonizing the coke raw material in a carbonization chamber, and manufacturing a coke, charging the coke raw material to the coal tower by the above method; charging the synthetic resins so that the synthetic resins are unevenly distributed on a machine side and a coke side in the coal tower; and charging the synthetic resins so that the synthetic resins are unevenly distributed on the machine side and the coke side in the carbonization chamber.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a method for charging raw materials into a coke oven and a method for producing coke when recycling synthetic resins, such as waste plastics, as raw materials for iron making in the coke oven. In the following description, the unit of mass, "t," is 10 3 In this specification, "synthetic resins" includes not only used plastics that are general waste, commonly known as waste plastics, but also plastics that become industrial waste, such as scraps and defective synthetic resins generated in the manufacturing process, and used plastics. [Background technology]

[0002] In recent years, marine pollution caused by waste plastic has become a global problem, with the amount of waste plastic dumped into the ocean estimated to be approximately 8 million tons per year worldwide. Addressing marine pollution was one of the Sustainable Development Goals (SDGs) adopted at the 2015 United Nations Summit. In response, Europe has adopted the EU Plastics Strategy, which aims to strengthen plastic recycling and reduce single-use plastics. Japan enacted the Containers and Packaging Recycling Law in 1995 and has been promoting waste plastic recycling for a long time. In response to growing momentum for further plastic waste reduction, the Act on Promotion of Resource Recycling Related to Plastics came into effect in 2022, calling for further strengthening of waste plastic recycling. In the steel industry, a technology has been put into practical use to recycle waste plastic as raw material for steelmaking by mixing it with coal and charging it into coke ovens. This technology is being implemented as a chemical recycling technology for waste plastic under the Containers and Packaging Recycling Law. However, it is known that mixing waste plastics into coal to produce coke reduces the strength of the coke, and the upper limit of the waste plastic mixing ratio at which coke strength does not decrease is said to be approximately 1 mass% (Non-Patent Document 1). Therefore, various technologies have been developed to suppress the deterioration of coke strength due to the mixing of waste plastics.

[0003] For example, Patent Document 1 discloses a method for pyrolysis recycling in which waste plastics are charged above the raw materials in the coke oven chamber at least one hour after the raw materials are charged into the coke oven chamber. The method claims that by utilizing the space above the coke oven, a large amount of waste plastics can be recycled without affecting the strength of the coke.

[0004] Patent Document 2 discloses a technique in which a coal blend A mixed with a small amount of waste plastics is charged into a coke oven carbonization chamber, a coal blend B mixed with a large amount of waste plastics is charged on top of the coal blend A, and the coal blend A and coal blend B are carbonized to produce coke. It is shown that while a large amount of waste plastics is charged into the upper part of the coke oven, clogging of the gas recovery and washing line by pyrolysis residue can be suppressed. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-135281 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-098276 [Non-patent literature]

[0006] [Non-Patent Document 1] Nomura, Seiji, Kato, Kenji, Nakagawa, Tomoyuki, Furumaki, Ikuo Journal of the Japan Institute of Energy, Vol. 81, No. 8 (2002) pp. 728-737 Summary of the Invention [Problem to be solved by the invention]

[0007] However, the conventional technology has the following problems. The technologies disclosed in Patent Documents 1 and 2 can minimize the impact on coke strength by separating coal and waste plastics. However, after charging coal, the raw material charging lid must be opened to charge the waste plastics. Therefore, to prevent gas leakage, strict control is required to ensure that the amount of gas generated does not exceed the amount of gas suction. However, if the amount of gas generated in the coking chamber increases or decreases due to fluctuations in coal quality or other factors, control can become difficult. This can lead to the risk of generated gas leaking outside and causing abnormal combustion. Furthermore, a large amount of generated gas is suctioned from the upper part of the coking chamber. Therefore, when waste plastics are carbonized in the upper part of the coking chamber, a large amount of powdered charred waste plastics is suctioned. This can cause blockages in the gas recovery and cleaning line, and the charred waste plastics may be mixed into the recovered tar, lowering the quality of the tar recovered as a product. Furthermore, since plastics are charged into the coal tower after the raw materials, a dedicated hopper for waste plastics must be provided on the top of the coal car. In addition, the additional steps required for charging raw materials reduces the productivity of the coke oven.

[0008] In addition, in the technology disclosed in Patent Document 2, first, a coal blend A for coke production, which is mixed with waste plastics in a range of 0% by mass to 1% by mass, is charged into a coke oven carbonization chamber. Next, while the coal blend A is being carbonized, a coal blend B, which is mixed with waste plastics in a ratio of 1% by mass to 60% by mass, is charged on top of the coal blend A. Then, the coal blend A and the coal blend B are carbonized to produce coke. This prevents clogging of the gas recovery and cleaning line due to pyrolysis residue while charging a large amount of waste plastics into the upper part of the coke oven. However, it is necessary to charge the coal blend A first, followed by the coal blend B, which has a high waste plastic mixing ratio. This not only reduces productivity but also requires mixing large amounts of waste plastics, which have significantly different densities and particle sizes, as uniformly as possible into the coal blend, which is difficult to achieve in a coke oven.

[0009] The present invention has been made in consideration of the above circumstances, and aims to propose a raw material charging method that enables easy realization of raw material arrangement in a coke oven that can suppress a decrease in coke strength when synthetic resins are blended, and a coke manufacturing method that uses the raw material charging method. [Means for solving the problem]

[0010] The method for charging raw materials into a coke oven according to the present invention, which advantageously solves the above-mentioned problems, comprises the steps of: charging synthetic resins as coke raw materials into a coke oven together with raw coal; and adjusting the apparent density of the synthetic resins among the raw coal and synthetic resins transported to the top of the coal tower to 0.70 g / cm. 3 By charging in the above manner, the synthetic resins and raw coal fall at different positions, and the synthetic resins are charged so that they are unevenly distributed on the machine side and the coke side in the coal tower.

[0011] The method for charging raw materials into a coke oven according to the present invention is as follows: (a) making the apparent density of the synthetic resins 1.1 times or more the apparent density of the raw coal; (b) The molded product of the synthetic resins has a sphere-equivalent diameter, or a cylinder-equivalent axial length and circular cross-sectional diameter, whichever is smaller, of 34 mm or more. This may be a more preferable solution.

[0012] The method for producing coke according to the present invention, which advantageously solves the above-mentioned problems, comprises charging synthetic resins as coke raw materials together with raw coal into a coal tower of a coke oven, charging the synthetic resins as coke raw materials into a carbonization chamber via a coal transport car, and carbonizing the coke raw materials in the carbonization chamber to produce coke. In this method, the apparent density of the synthetic resins among the raw coal and synthetic resins transported to the top of the coal tower is set to 0.70 g / cm. 3 By charging in the above manner, the falling positions of the synthetic resins and raw coal are separated, and the synthetic resins are charged so that they are unevenly distributed on the machine side and the coke side in the coal tower, and the synthetic resins are charged so that they are unevenly distributed on the machine side and the coke side in the carbonization chamber.

[0013] The method for producing coke according to the present invention is as follows: (a) making the apparent density of the synthetic resins 1.1 times or more the apparent density of the raw coal; (b) The molded product of the synthetic resins has a sphere-equivalent diameter, or a cylinder-equivalent axial length and circular cross-sectional diameter, whichever is smaller, of 34 mm or more. This may be a more preferable solution. [Effects of the Invention]

[0014] In the present invention, synthetic resins are made denser and larger than conventional ones, transported to the coal tower together with the raw coal, and when the raw materials are charged into the coal tower, the synthetic resins and raw coal fall separately. This makes it possible to unevenly distribute synthetic resins within the coal tower without the need for dedicated charging equipment. By unevenly distributing synthetic resins within the coal tower, it becomes possible to unevenly distribute the synthetic resins charged into the coal car directly below, thereby enabling uneven distribution of synthetic resins within the coke chamber. In this case, the synthetic resins are concentrated at both ends of the longitudinal direction of the coke chamber, reducing the mixing ratio of synthetic resins in other areas and suppressing the deterioration of the strength of the produced coke. This makes it possible to process larger amounts of synthetic resins. Although the coke strength decreases at the ends where the synthetic resins are concentrated, the severely deteriorated portions are crushed into fine coke by impacts during the subsequent coke transportation process and cooling process (coke dry quenching system, wet quenching system, etc.). The fine coke can be recovered and used as fuel in processes such as iron ore sintering. [Brief explanation of the drawings]

[0015] [Figure 1] 1 is a schematic vertical cross-sectional view illustrating a method for charging raw materials into a coke oven according to one embodiment of the present invention. FIG. [Figure 2] FIG. 2 is a schematic top view of the coal tower of the coke oven according to the embodiment. [Figure 3] FIG. 1 is a schematic vertical cross-sectional view illustrating a conventional method for charging raw materials into a coke oven. DETAILED DESCRIPTION OF THE INVENTION

[0016] The following is a detailed description of embodiments of the present invention. The following embodiments are intended to exemplify equipment and methods for embodying the technical concept of the present invention, and are not intended to limit the configuration to that described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope described in the claims.

[0017] (Method of charging raw materials into a coke oven) 1 and 2 are a schematic vertical cross-sectional view and a schematic top view, respectively, for explaining a method of charging raw materials into a coke oven. In this embodiment, when coal (raw coal) 3 and synthetic resins 2 are supplied as coke raw materials into a coke oven carbonization chamber 7, the coal 3 and synthetic resins 2 are transported together to the top of a coal tower 1. At that time, the apparent density of the synthetic resins is set to 0.70 g / cm. 3 Preferably, the apparent density of the synthetic resin is 0.72 g / cm or more. 3 or more. Preferably, the apparent density is increased by 10% or more compared to conventional synthetic resins. Preferably, the smaller of the sphere-equivalent diameter, or the cylindrical axis length and circular cross-sectional diameter of the synthetic resin moldings is 34 mm or more. More preferably, the volume is increased by 10% or more compared to conventional synthetic resins. Preferably, the apparent density of the synthetic resins is 1.1 times or more the apparent density of the raw coal. Then, when the synthetic resins are charged into the coal tower 1 from the belt conveyor via the rotary conveyor 4, the synthetic resins, which are denser and bulkier than the raw coal, fall farther than the raw coal. The trajectory 2A of the synthetic resins shown in Figure 1 is made to reach farther than the trajectory 3A of the coal. In other words, the synthetic resins are concentrated near the wall of the coke discharge side [hereinafter also referred to as the coke side (C / S)] or the coke extrusion side [hereinafter also referred to as the machine side (M / S)] in the coal tower. The reason for this is that as the apparent density increases, synthetic resins fall from the conveyor with difficulty slowing down due to air resistance, and so fall farther. Also, as the apparent density increases, they tend to roll more easily after falling, and tend to concentrate near the wall.

[0018] The falling position of the synthetic resins is determined by the apparent density of the synthetic resins, conveyor speed, falling direction, shape of the synthetic resin, etc., and can be estimated by calculations assuming horizontal projection motion that takes air resistance into account. By adjusting the falling trajectory 2A of the synthetic resins so that they do not come into contact with the wall of the coal tower, it is possible to suppress wear on the wall and powdering of the synthetic resins.

[0019] Here, the horizontal movement of synthetic resins and coal as they are fed from the conveyor into the coal tower is expressed as a horizontal projection motion that takes air resistance into account, as shown in Equation 1 (1) below. Here, m is the mass of the object, x is the horizontal position of the object, t is the elapsed time, γ is the viscous resistance coefficient, and v0 is the conveyor speed. When Equation 1 is solved, the horizontal position x is proportional to the mass m and the conveyor speed v0, and inversely proportional to the viscous resistance coefficient γ, as shown in Equation 2 (2) below. The horizontal position x, i.e., the flight distance, is proportional to the object's mass m and inversely proportional to the viscous resistance coefficient γ. Furthermore, the mass m is determined by the density ρ and the volume V, and the viscous resistance coefficient γ is correlated with the projected area. For example, for a sphere, the viscous resistance coefficient γ is expressed in Equation 3 (3) below. π is the circumference ratio, r is the radius of the sphere, and η is the viscosity coefficient of air.

[0020]

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[0021] If we assume a sphere, the volume V is expressed as in Equation (4) below. Therefore, the flight distance of the object can be expressed as Equation (5) below from Equations (2), (3), and (4). Here, ρ is the density of the object. Therefore, to increase the flight distance, it is sufficient to increase the density and radius. Synthetic resins are often molded into shapes close to cylinders, but if the ratio of diameter to height does not change significantly, it is thought to show the same trend as Equation (5) assuming a sphere. Therefore, it can be said that the flight distance increases with an increase in density and radius, i.e., the mass of the synthetic resin. In other words, a synthetic resin molded object with a higher density and mass will be placed farther away from coal, which has a lower density and mass.

[0022]

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[0023] In this embodiment, the synthetic resins 2 unevenly distributed on the machine side 8 and the coke side within the coal tower 1 are supplied to the coal car 6 without moving them horizontally. In this way, the mixing ratio of synthetic resins 2 in the coke raw material supplied to the coal car closest to the machine side 8 and the coke side 9 (= synthetic resins mass / (coal mass+coal mass)×100, mass-based percentage) can be made higher than that of the other coal cars 6, without providing a hopper dedicated to the synthetic resins 2.

[0024] Then, the coke raw materials are charged into the furnace of the carbonization chamber 7 from the coal delivery cars 6 through multiple charging ports at the top of the carbonization chamber 7. Therefore, the synthetic resins 2 can be unevenly distributed on the machine side 8 and the coke side of the carbonization chamber 7.

[0025] In this embodiment, the preferred arrangement of synthetic resins in the coke chamber 7 is as follows. That is, it is preferable to equally divide the interior of the coke chamber 7 into four or more regions in the longitudinal direction of the coke chamber, and charge the synthetic resins 2 so that the mixing ratio of the synthetic resins 2 in the region in contact with the coke side 8 and the region in contact with the machine side 9 exceeds the mixing ratio of the synthetic resins 2 in the other inner regions. Furthermore, it is more preferable that the mixing ratio ratio is three times or more. In this case, it is preferable that the total mass of the synthetic resins 2 charged in the region in contact with the coke side 8 and the region in contact with the machine side 9 is 75% or more of the total. At this time, the mixing ratio of the synthetic resins 2 in the other inner regions is 50% or less of the average mixing ratio of the synthetic resins. Therefore, the decrease in strength of the coke after carbonization in that region can be suppressed to 50% or less compared to when the synthetic resins 2 are evenly distributed. Although there is no upper limit to the number of regions in the coke chamber 7, taking into consideration the installation load of the raw material charging equipment, it is preferable to divide the coke chamber 7 into 10 or less regions, and more preferably 6 or less regions.

[0026] The carbonization chamber 7 of a typical coke oven has a long, narrow, approximately rectangular parallelepiped shape (for example, W 0.6 m × D 15 m × H 7 m). To distribute the raw material uniformly in the carbonization chamber 7, coal is charged through multiple coal inlets arranged in the longitudinal direction (direction D) of the carbonization chamber 7. At this time, by increasing the mixing ratio of synthetic resins charged through the inlet closest to the coke side 8 or machine side 9, it is possible to concentrate the synthetic resins 2 near the coke side 8 or machine side 9 and unevenly distribute them.

[0027] In this embodiment, the amount of synthetic resins 2 added to the coke oven to be mixed with coal 3 is not particularly limited, but from an environmental perspective, it is preferable that the amount be 0.5 mass% or more relative to the total amount of raw materials charged to the coke oven. More preferably, it is more than 1.0 mass%, and even more preferably, it is 3.0 mass% or more. There is no particular upper limit, but adding more than 5 mass% may reduce coke strength. In particular, when adding a large amount of synthetic resins 2, it is preferable to distribute the synthetic resins 2 unevenly in the region near the coke side 8 and the machine side 9 so that the amount of synthetic resins 2 is 1.0 mass% or less per raw material charged in the inner region excluding the regions near the coke side 8 and the machine side 9. More preferably, the amount of synthetic resins 2 is less than 1.0 mass% per raw material charged in the inner region excluding the regions near the coke side 8 and the machine side 9.

[0028] (Synthetic resin moldings) When the same mass of synthetic resins is added, the more they are added, the lower the coke strength becomes. When synthetic resins are carbonized in coal, they have a high volatile content, which causes voids to form after evaporation, resulting in voids inside the coke after carbonization. Since voids are the starting point for cracks inside the coke, it is thought that the more voids there are, the more cracks will occur, and the lower the coke strength becomes.

[0029] Synthetic resins are molded, for example, using a twin-screw extruder to produce molded synthetic resin products. The synthetic resins are crushed or pre-granulated before being supplied. In this case, it is preferable to adjust the moisture content of the synthetic resins to 5% by mass or less. By reducing the moisture content of the synthetic resins, the synthetic resins can be molded stably, and the density of the molded product increases. Various types of dryers, including hot air flow dryers, can be used to evaporate the moisture from the synthetic resins.

[0030] Any twin-screw extruder suitable for use in this embodiment and capable of molding synthetic resins may be used, and there is no difference in basic structure. The feedstock is kneaded by twin screws housed in a casing, and the synthetic resin is extruded through a nozzle attached to a heated plate. The cylindrically extruded synthetic resin is cut by a rotary cutter to a fixed length. The volume per synthetic resin is adjusted by the nozzle inner diameter and the cutter cutting speed. Nozzles with an inner diameter of 20 to 30 mm are typically used. Large-diameter nozzles with an inner diameter of 40 to 60 mm are used for molding, making it possible to produce large molded products. The mass of synthetic resin per unit increases, allowing for a greater amount to be charged for the same number of units.

[0031] The molded synthetic resins are cylindrical with a diameter equal to or slightly larger than the inner diameter of the nozzle, and their length can be adjusted by the rotation speed of the cutter. The length of the molded product is affected by the position and condition of the forming nozzle, so it is difficult to make it a constant length. There is a distribution of molded products ranging from short to long. The volume can be increased by increasing the maximum length of the molded product, but it is preferable that the maximum length within the molded product length distribution be 200 mm or less. This is because the diameter of the charging port at the top of the carbonization chamber of a coke oven is approximately 400 to 500 mm, and if the maximum length is made longer than this, clogging may occur. The average volume of the molded product is 90 cm 3 More than 150cm is preferable. 3 More than 200cm is preferable. 3 The upper limit depends on the size of the charging port when charging into the coke oven, but is 1000 cm 3 It is preferable that the distance is less than 600 cm 3 As described above, in order to separate the coke raw material in the coal tower 1, it is preferable to mold the synthetic resins so that the diameter equivalent to a sphere, or the smaller of the axis length and circular cross-sectional diameter equivalent to a cylinder, is 34 mm or more.

[0032] (Coke manufacturing method) The molded synthetic resins are loaded into a hopper, fed at a constant speed by a metering feeder, and placed on the coal on a belt conveyor that supplies blended coal to the coke oven. In this embodiment, the synthetic resins 2 are unevenly distributed on the coke side 8 and the machine side 8 within the coal tower 1. The coal is fed to each coal car 6 while maintaining this uneven distribution. The synthetic resins 2 are then distributed more in the charging ports closest to the coke side 8 and the machine side 8, and less in the charging ports other than the coke side 8. This reduces the mixing ratio of the synthetic resins 2 charged through the other charging ports, thereby suppressing a decrease in coke strength after carbonization in that area. The drum strength index DI150 / 15 can be measured as an index of coke strength according to the drum strength measurement method specified in JIS K2151:2004, a coke test machine is charged with the synthetic resins, rotated 150 times, and sieved through a 15 mm mesh sieve. When using the drum strength index DI150 / 15, it is preferable to keep the decrease in DI150 / 15 to less than 1 point. This is because the DI150 / 15 index is known to have a measurement error of about 0.5 points, and a decrease in strength of 1 point or more clearly indicates a decrease in coke strength. In coke oven operation, a decrease in coke strength (DI150 / 15) of 1 point or more is recognized as a decrease in coke strength, and operations such as improving the quality of the coking coal may be performed.

[0033] The synthetic resin mixture ratio is basically controlled by measuring the coal and synthetic resin feed rates in advance and adjusting the feed rate of the quantitative feeder or gate opening to maintain a constant ratio. Furthermore, the synthetic resin mixture ratio in the longitudinal direction (D direction) of the coke oven chamber is difficult to measure directly. Therefore, it can be estimated from the synthetic resin mixture ratio in each hopper of the coal car above the coke chamber's coal inlet. When raw materials are charged into a single coke oven through multiple inlets, they are simultaneously charged through each inlet, so the synthetic resin mixture ratio directly below each inlet is considered to be the same as the synthetic resin mixture ratio in each hopper of the coal car. The synthetic resin mixture ratio in each hopper of the coal car can be estimated by installing a camera above each hopper, detecting synthetic resins through image analysis, and calculating the synthetic resin charge mass.

[0034] The synthetic resin moldings should preferably be cut out from a location where the belt conveyor is low after passing through the coal drying facility (CMC). Because the coal is heated and dried in the CMC, if synthetic resin moldings are added before the CMC, there is a risk that the synthetic resin moldings will melt inside the CMC. The synthetic resin moldings pass through a coal tower and coal transport car together with blended coal and are supplied to the carbonization chamber. The synthetic resins are thermally decomposed in the carbonization chamber, and some remain as charcoal, but most are recycled as gas or tar. [Example]

[0035] (Example of invention) A mixture of waste plastics, mainly consisting of thermoplastic resins, was crushed and confirmed to have a moisture content of 5% or less. After that, the mixture was heated and extruded from the nozzle of a twin-screw extruder, cut, and molded into a cylindrical shape. The density of the molded waste plastic was 0.70 g / cm. 3The above was the procedure. After this was charged into the hopper, it was extruded at a constant rate onto the blended coal conveyor. The mixing ratio of the waste plastic molded materials was adjusted to 1.5% by mass. The coke oven equipment configuration was the same as that shown in Figure 1. The blended coal and the waste plastic molded materials were transported together to the top of the coal tower, and the charging direction was adjusted using a rotating conveyor, and they were charged toward the machine side. The waste plastic molded materials were produced under the conditions shown in Table 1. After charging for a certain period of time, the direction of the rotating conveyor was adjusted, and the raw material was similarly charged toward the coke side. This resulted in the waste plastic molded materials concentrating and falling near the coke side of the coal tower. These operations were repeated multiple times to charge the raw material up to the top of the coal tower. Next, a coal car was moved below the coal tower, and the raw material was extruded from the coal tower. As the raw material was extruded, the interior of each hopper on the coal car was filmed with a video camera from above, and the amount of waste plastic molded materials charged was estimated from the video. As shown in Table 1, the waste plastic mixing ratio was high in the hoppers near the machine side (M / S) or the coke side (C / S), and it was revealed that the waste plastic mixing ratio was very low in other hoppers, as shown in Nos. 4 to 11. Because the raw materials from each hopper were simultaneously charged into the carbonization chamber directly below, the waste plastic mixing ratio within the carbonization chamber was also very high near the machine side and the coke side. The drum strength index DI150 / 15, also listed in Table 1, was 85.0 to 86.3.

[0036] (Comparative Example) Manufactured in the same manner as in the invention example, the apparent density was 0.70 g / cm 3The waste plastic molded materials, which were less than 100% of the total mass, were loaded into a hopper and then extruded at a constant rate onto a blended coal conveyor, as shown in Figure 3. Next, the blended coal and the waste plastic molded materials were transported together to the top of the coal tower, where the charging direction was adjusted using a rotating conveyor and charged toward the machine side. During this process, the blended coal and the waste plastic were extruded together from the rotating conveyor. After charging for a certain period of time, the direction of the rotating conveyor was adjusted, and the raw materials were similarly charged toward the coke side. These operations were repeated multiple times to load the raw materials up to the top of the coal tower. Next, a coal car was moved below the coal tower, and the raw materials were extruded from the coal tower. During the extrusion of the raw materials, the interior of each hopper on the coal car was filmed with a video camera from above, and the amount of waste plastic molded materials charged was estimated from the footage. The waste plastic mixture ratio tended to be higher in hoppers near the machine side or the coke side, as shown in Table 1, but it was also revealed that waste plastic was charged in other hoppers. Because the raw materials from each hopper are simultaneously charged into the carbonization chamber directly below, the waste plastic mixing ratio within the carbonization chamber is high near the machine side and near the coke side, but the difference is not as great as in the invention example. The drum strength index DI150 / 15, also listed in Table 1, was 84.3 or less, which was inferior to the invention example.

[0037] [Table 1] [Industrial Applicability]

[0038] Although the above description has been made on synthetic resins, the present invention is not limited to this. The same effect can be obtained when biomass is mixed with synthetic resins or when biomass is substituted for synthetic resins. [Explanation of symbols]

[0039] 1 coal tower 2. (Waste plastic) Synthetic resins 2A (Synthetic Resin) Trajectory 3 (Blend coal, coal) coking coal 3A (Coal) Trajectory 4. Rotating conveyor 6 Coal Car 7. Carbonization chamber 8 Machine Side 9. Corkside

Claims

1. When synthetic resins are charged into a coke oven together with coking coal as coke raw materials, The apparent density of the synthetic resin among the raw coal and synthetic resins transported to the top of the coal tower was 0.70 g / cm ３ By charging as above, The synthetic resins and the raw coal are charged at separate locations so that they are unevenly distributed on the machine side and the coke side in the coal tower. Method of charging raw materials into a coke oven.

2. 2. The method for charging raw materials into a coke oven according to claim 1, wherein the apparent density of the synthetic resins is set to be 1.1 times or more the apparent density of the raw coal.

3. 3. The method for charging raw materials into a coke oven according to claim 1, wherein the synthetic resin molding has a sphere-equivalent diameter, or a cylinder-equivalent axial length and a circular cross-sectional diameter, whichever is smaller, of 34 mm or more.

4. Synthetic resins are charged as coke raw materials into the coal tower of a coke oven together with raw coal, and then the materials are transferred to the carbonization chamber via a coal car. In the carbonization chamber, the coke raw materials are carbonized to produce coke. The apparent density of the synthetic resin among the raw coal and synthetic resins transported to the top of the coal tower was 0.70 g / cm ３ By charging as above, The synthetic resins and the raw coal are charged at separate locations so that they are unevenly distributed on the machine side and the coke side in the coal tower. In the carbonization chamber, synthetic resins are charged so that they are unevenly distributed on the machine side and the coke side. Coke manufacturing method.

5. The method for producing coke according to claim 4, wherein the apparent density of the synthetic resins is 1.1 times or more the apparent density of the raw coal.

6. The method for producing coke according to claim 4 or 5, wherein the synthetic resin molding has a sphere-equivalent diameter, or a cylinder-equivalent axial length and a circular cross-sectional diameter, whichever is smaller, of 34 mm or more.

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