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, passing the raw material coal and the synthetic resins conveyed to the upper part of a coal tower through an inclined sieving net; separating the raw material coal and the synthetic resins into an upper sieve and a lower sieve by particle size and charging the separated raw material coal and synthetic resins; and 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 a coal tower. A method for manufacturing a coke includes: when charging a coke raw material in a coal tower to a carbonization chamber through a coal loading vehicle, carbonizing the coke raw material in the 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 of charging raw materials into a coke oven according to the present invention, which advantageously solves the above-mentioned problems, is characterized in that when synthetic resins are charged into a coke oven together with raw coal as coke raw materials, the raw coal and synthetic resins transported to the top of the coal tower are passed through an inclined sieve mesh and separated into over-sieve and under-sieve pieces based on particle size before being charged, thereby isolating the positions at which the synthetic resins and raw coal fall and charging the synthetic resins so that they are unevenly distributed on the machine side and coke side within the coal tower.

[0011] The method for charging raw materials into a coke oven according to the present invention is as follows: (a) The sieve screen is set at an angle greater than the angle of repose of the blended coal with respect to the horizontal plane, and the type of the sieve screen is a grizzly feeder; (b) The mesh size of the sieve is 10 mm or more and less than 20 mm; (c) Granulating or molding the synthetic resins in advance so that the diameter is equivalent to a sphere, or the smaller of the axis length and cross-sectional diameter of an equivalent cylinder is 20 mm or more; This may be a more preferable solution.

[0012] The coke manufacturing method of the present invention, which advantageously solves the above-mentioned problems, is characterized in that synthetic resins are charged as coke raw materials into the coal tower of a coke oven together with raw coal, and then charged into the carbonization chamber via a coal delivery car, and the coke raw materials are carbonized in the carbonization chamber to produce coke, the raw coal and synthetic resins transported to the top of the coal tower are passed through an inclined sieve mesh and separated into over-sieve and under-sieve based on particle size before being charged, thereby isolating the positions at which the synthetic resins and raw coal fall, and the synthetic resins are charged so that they are unevenly distributed on the machine side and coke side in the coal tower, and the synthetic resins are charged so that they are unevenly distributed on the machine side and coke side in the carbonization chamber.

[0013] The method for charging raw materials into a coke oven according to the present invention is as follows: (d) The sieve screen is set at an angle greater than the angle of repose of the blended coal with respect to the horizontal plane, and the type of the sieve screen is a grizzly feeder. (e) The mesh size of the sieve is 10 mm or more and less than 20 mm; (f) Granulating or molding the synthetic resins in advance so that the diameter is equivalent to a sphere, or the smaller of the axis length and cross-sectional diameter of an equivalent cylinder is 20 mm or more; This may be a more preferable solution. [Effects of the Invention]

[0014] In this invention, synthetic resins are transported to the coal tower together with raw coal, and when the raw materials are charged into the coal tower, the synthetic resins and raw coal are passed through an inclined sieve mesh. The sieve mesh separates the synthetic resins into oversieved and undersieved particles based on particle size before charging, enabling the synthetic resins to be unevenly distributed within the coal tower without the need for dedicated charging equipment. By unevenly distributing the synthetic resins within the coal tower, the synthetic resins charged into the coal car directly below can be unevenly distributed, thereby enabling the uneven distribution of synthetic resins in 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 coke strength. This makes it possible to process larger amounts of synthetic resins. While 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 transport process and cooling process (e.g., coke dry quenching system, wet quenching system). The coke breeze is recovered and can be used as fuel in processes such as sintering iron ore. [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. 4 is a schematic vertical cross-sectional view illustrating a method for charging raw materials into a coke oven according to another embodiment of the present invention. [Figure 4] FIG. 1 is a schematic vertical cross-sectional view illustrating a conventional method for charging raw materials into a coke oven. [Figure 5] 1 is a graph comparing the distribution of synthetic resins between an example of the present invention and a conventional example. 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 those described below. In other words, the technical concept of the present invention can be modified in various ways within the technical scope defined 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, illustrating a method for charging raw materials into a coke oven. In this embodiment, when coal (coking 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. Then, when the coal is charged into the coal tower 1 via a belt conveyor and a rotating conveyor 4, the coal is passed through a sieve mesh 5 (inclined screen). The sieve mesh 5 primarily sifts the coal 3 below the sieve and the synthetic resins 2 above the sieve. This separates the falling positions of the coal 3 and the synthetic resins 2, allowing the coke raw materials to be charged. The position of the sieve mesh 5 is adjusted so that the synthetic resins 2 are concentrated near the wall of the coke discharge side [hereinafter also referred to as the coke side 9 (C / S)] or the coke extrusion side [hereinafter also referred to as the machine side 8 (M / S)] within the coal tower 1. The mesh size of the sieve mesh 5 is preferably set larger than the coal particle size but smaller than the synthetic resin particle size. This allows the coal 3 that passes through the sieve mesh 5 to fall toward the front, while the synthetic resins 2 that pass over the sieve fall farther away. Typically, the average particle size of the coal 3 is less than 10 mm, and the average particle size of the molded synthetic resins 2 is 20 mm or more. Here, the average particle size is defined as the sphere-equivalent diameter based on a 50% cumulative volume. Therefore, the mesh size of the sieve mesh 5 is preferably 10 mm or more but less than 20 mm. The falling trajectory of the synthetic resins 2 is determined by the speed and direction of the falling synthetic resins at the tip of the sieve mesh 5, the shape and mass of the synthetic resins 2, etc., and can be estimated using the equation of motion for free fall. It is preferable to adjust the falling trajectory of the synthetic resins 2 so that it does not contact the wall of the coal tower 1. This prevents wear on the wall of the coal tower 1 and powdering of the synthetic resins 2. Furthermore, the type of sieve 5 is not limited as long as it is capable of sorting by particle size. Various separation methods are available, including sieves using a lattice mesh and grizzly feeders, which pass materials through rows of comb teeth. Grizzly feeders are particularly suitable because they are less likely to clog the sieve mesh. While a vibrating device is not necessarily required, it is preferable to install one to prevent the accumulation and clogging of raw materials on the sieve 5.Furthermore, it is preferable that the inclination angle of the sieve screen 5 is equal to or greater than the angle of repose of the coal 3 relative to the horizontal plane. If the inclination angle of the sieve screen is smaller than the angle of repose of the coal 3, the coal 3 may accumulate on the sieve screen when the sieve screen becomes clogged. In this case, the synthetic resins 2 and the coal 3 will fall to the same position.

[0018] 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.

[0019] 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.

[0020] 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.

[0021] 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.

[0022] 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 relative to the raw materials charged in the inner region excluding the regions near the coke side 8 and the machine side 9.

[0023] In the above embodiment, an example using a rotating conveyor is shown, but this is not a limitation. As shown in Fig. 3, instead of a rotating conveyor, for example, a plurality of weirs 10 can be provided on the conveyor, and a sieve screen 5 can be provided to guide the synthetic resins 2 and coal 3 falling from the conveyor toward the corners of the coke side 8 or machine side 9. This allows the synthetic resins to be unevenly distributed near the coke side 8 and machine side 9 within the coal tower 1, as in the above embodiment. In the example of Fig. 3, two weirs are installed so as to be movable up and down, and one of them is controlled to block the material being transported on the conveyor.

[0024] (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.

[0025] 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.

[0026] 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.

[0027] 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 using a sieve in the coal tower 1, it is preferable to granulate or mold the synthetic resins so that the smaller of the diameter equivalent to a sphere, or the axis length and cross-sectional diameter equivalent to a cylinder, is 20 mm or more.

[0028] (Coke manufacturing method) The molded synthetic resins are loaded into a hopper, fed at a constant speed by a metering feeder, and then fed onto the coal on a belt conveyor that supplies blended coal to the coke oven. In this embodiment, a sieve mesh is used to unevenly distribute the synthetic resins 2 on the coke side 8 and the machine side 8 within the coal tower 1. This uneven distribution is maintained while the synthetic resins are fed to each coal car 6. 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 the coke strength of those portions after carbonization. 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, and the mass fraction of the remaining material sieved through a 15 mm mesh sieve after 150 rotations. 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.

[0029] 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.

[0030] 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]

[0031] (Example of invention) A mixture of waste plastics, primarily composed of thermoplastic resins, was crushed and confirmed to have a moisture content of 5% or less. It was then heated and extruded through a 40 mm diameter nozzle using a twin-screw extruder. It was then cut into cylindrical pieces with an axial length of 20 mm or more and formed into cylinders. This was then loaded into a hopper and cut out at a constant rate onto a coal blend conveyor. The blended coal and the waste plastic molded pieces were adjusted to a mixing ratio of 1.5% by mass. The coke oven equipment configuration was the same as shown in Figure 1. The blended coal and the waste plastic molded pieces were transported together to the top of the coal tower, and the charging direction was adjusted using a rotating conveyor, so that they were charged toward the side of the machine. A Grizzly feeder with 20–30 mm mesh openings was installed at the end of the rotating conveyor, allowing only the blended coal to pass directly below, while only the waste plastic molded pieces passed over the sieve and fell near the side of the machine. The Grizzly feeder was installed at an angle of 35° to the horizontal to prevent coal from piling up on the feeder. After a certain period of charging, the direction of the rotating conveyor was adjusted, and the raw material was charged in the same way toward the coke side. This caused the waste plastic molded products to fall concentrated near the coke side of the coal tower. This process was repeated several times until the raw material reached the top of the coal tower. Next, a coal car was moved below the coal tower, and the raw material was discharged from the coal tower. As the raw material was discharged, a video camera was used to capture the interior of each hopper on the coal car from above, and the amount of waste plastic molded products charged was estimated from the footage. As shown in Figure 5, the waste plastic mixing ratio was found to be high in hoppers near the machine side (M / S) or the coke side (C / S), while the waste plastic mixing ratio was very low in other hoppers. 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 very high near the machine side and the coke side. The drum strength index DI150 / 15 of the coke produced in this example was 85.6.

[0032] (Comparative Example) The waste plastic molded materials, manufactured in the same manner as in the invention example, were loaded into a hopper and extruded at a constant rate onto the blended coal conveyor, as shown in Figure 4. Next, 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 the materials were 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. As shown in Figure 5, the waste plastic mixing ratio tended to be higher in the hoppers near the machine side or the coke side, but it was also revealed that waste plastic was charged in other hoppers. Because the raw materials from each hopper were simultaneously charged into the carbonization chamber directly below, the ratio of mixed waste plastics in the carbonization chamber was high near the machine side and near the coke side, but the difference was not as great as in the invention example. The drum strength index DI150 / 15 of the coke produced in this comparative example was 84.6, which was inferior to the invention example. [Explanation of symbols]

[0033] 1 coal tower 2. (Waste plastic) Synthetic resins 3 (Blend coal, coal) coking coal 4. Rotating conveyor 5 (inclined screen) sieve mesh 6 Coal Car 7. Carbonization chamber 8 Machine Side 9. Corkside 10 Weir

Claims

1. When synthetic resins are charged into a coke oven together with coking coal as coke raw materials, The raw coal and synthetic resins transported to the top of the coal tower are passed through an inclined sieve and separated into over-sieve and under-sieve pieces according to particle size before being charged, thereby isolating the falling positions of the synthetic resins and raw coal, The synthetic resins are charged 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 sieve screen is set at an angle greater than the angle of repose of the blended coal relative to the horizontal plane, and the sieve screen is in the form of a grizzly feeder.

3. 3. The method for charging raw materials into a coke oven according to claim 1, wherein the mesh size of the sieve is 10 mm or more and less than 20 mm.

4. 4. The method for charging raw materials into a coke oven according to claim 3, wherein the synthetic resins are granulated or molded in advance so that the smaller of the diameter equivalent to a sphere, or the axis length and circular cross-sectional diameter equivalent to a cylinder, is 20 mm or more.

5. 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 raw coal and synthetic resins transported to the top of the coal tower are passed through an inclined sieve and separated into over-sieve and under-sieve pieces according to particle size before being charged, thereby isolating the falling positions of the synthetic resins and raw coal, Synthetic resins are charged so that they are unevenly distributed on the machine side and 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.

6. 6. The method for producing coke according to claim 5, wherein the sieve screen is set at an angle greater than the angle of repose of the blended coal with respect to the horizontal plane, and the type of the sieve screen is a grizzly feeder.

7. The method for producing coke according to claim 5 or 6, wherein the mesh size of the sieve mesh is 10 mm or more and less than 20 mm.

8. 8. The method for producing coke according to claim 7, wherein the synthetic resins are granulated or molded in advance so that the smaller of the diameter equivalent to a sphere, or the axis length and circular cross-sectional diameter equivalent to a cylinder, is 20 mm or more.

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