Method for charging raw materials into a coke oven and method for producing 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] This invention relates to a method for charging raw materials into a coke oven and a method for producing coke, in which synthetic resins, such as waste plastics, are recycled as raw materials for steelmaking in a coke oven. In the following description, the unit of mass "t" is 10 3 This is expressed in kilograms. In this specification, "synthetic resins" includes not only used plastics, which are general waste referred to as waste plastics, but also plastics that constitute industrial waste, such as scraps and defective products of synthetic resins generated in the manufacturing process, and used plastics. [Background technology]

[0002] In recent years, marine pollution caused by waste plastics has become a global problem, with an estimated 8 million tons of waste plastics flowing into the ocean worldwide annually. Solving marine pollution is one of the goals outlined in the Sustainable Development Goals (SDGs) adopted at the UN Summit in 2015. To address this, Europe has launched the "EU Plastics Strategy" to strengthen plastic recycling and reduce single-use plastics. In Japan, the Container and Packaging Recycling Law was enacted in 1995, and the recycling of waste plastics has been promoted since early on. In response to the growing momentum for further reduction of waste plastics, the "Law Concerning the Promotion of Resource Recycling Related to Plastics" came into effect in 2022, requiring further strengthening of waste plastic recycling. In the steel industry, a technology has been put into practical use to recycle waste plastics as a raw material for steelmaking by mixing them with coal and charging them into coke ovens. This is implemented as a chemical recycling technology for waste plastics under the Container and Packaging Recycling Law. However, it is known that mixing waste plastics with coal to produce coke reduces coke strength, and the upper limit for the amount of waste plastics that can be mixed without reducing coke strength is considered to be approximately 1% by mass (Non-Patent Literature 1). Therefore, various technological developments have been carried out to suppress the deterioration of coke strength due to the mixing of waste plastics.

[0003] For example, Patent Document 1 discloses a method of pyrolysis recycling in which, after charging raw materials into the carbonization chamber of a coke oven, waste plastics are charged onto the top of the raw materials in the carbonization chamber at least one hour later. This method utilizes the space above the coke oven and allows for the recycling of large quantities of waste plastics without affecting the coke strength.

[0004] Furthermore, Patent Document 2 discloses a technique in which a blended coal A, which contains a small amount of waste plastic, is charged into the carbonization chamber of a coke oven, and a blended coal B, which contains a large amount of waste plastic, is charged on top of blended coal A, and blended coal A and blended coal B are carbonized to produce coke. It is shown that this technique can suppress blockage of the gas recovery and washing line due to thermal decomposition residue while charging a large amount of waste plastic into the top of the coke oven. [Prior art documents] [Patent Documents]

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

[0006] [Non-Patent Document 1] Seiji Nomura, Kenji Kato, Tomoyuki Nakagawa, Ikuo Komaki, Journal of the Japan Energy Society, Vol. 81, No. 8 (2002), pp. 728-737. [Overview of the Initiative] [Problems that the invention aims to solve]

[0007] However, conventional technology had the following problems: The technologies disclosed in Patent Documents 1 and 2 make it possible to minimize the impact on coke strength by separating coal and waste plastic. On the other hand, after coal is charged, the raw material charging lid must be opened and waste plastic must be charged. Therefore, in order to prevent gas leakage, it is necessary to strictly control the amount of gas generated so that it does not exceed the amount of gas sucked in. However, if the amount of gas generated in the carbonization chamber increases or decreases due to fluctuations in coal quality or other reasons, control may become difficult. In that case, the generated gas may leak to the outside and cause abnormal combustion. In addition, a large amount of gas generated is sucked in at the top of the carbonization chamber. Therefore, if waste plastic is carbonized at the top of the carbonization chamber, a large amount of powdered waste plastic char is sucked in. This may cause blockage in the gas recovery and washing line, and these waste plastic char may be mixed into the recovered tar, potentially lowering the quality of the tar recovered as a product. Furthermore, since plastic is charged after the raw material is charged into the coal tower, it is necessary to prepare a dedicated hopper for waste plastic on top of the coal transport vehicle. In addition, the increased number of steps involved in charging the raw materials contributes to a decrease in the productivity of the coke oven.

[0008] Furthermore, in the technology disclosed in Patent Document 2, first, blended coal A for coke production, which is mixed with waste plastic in a range of 0% to 1% by mass, is charged into the carbonization chamber of the coke oven. Next, while blended coal A is being carbonized, blended coal B, which is mixed with waste plastic in a ratio of 1% to 60% by mass, is charged on top of blended coal A. Then, blended coal A and blended coal B are carbonized to produce coke. This allows for the large-scale charging of waste plastic into the upper part of the coke oven while suppressing blockage of the gas recovery and washing line due to thermal decomposition residue. However, it is necessary to charge blended coal B, which has a high waste plastic content, after charging blended coal A first. As a result, productivity is reduced, and it is difficult to implement in a coke oven because a large amount of waste plastic with greatly different densities and particle sizes needs to be mixed as uniformly as possible in the blended coal.

[0009] This invention has been made in view of the above circumstances, and aims to propose a raw material charging method for a coke oven that can easily realize a raw material arrangement that can suppress the decrease in coke strength when compounding synthetic resins. Furthermore, it aims to propose a method for producing coke using this raw material charging method. [Means for solving the problem]

[0010] The present invention provides a method for charging raw materials into a coke oven that advantageously solves the above problems. In this method, synthetic resins are charged into the coke oven together with raw coal as coke raw materials, and 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 / cm³. 3 By charging in the manner described above, the drop locations of the synthetic resins and the raw coal are separated, and the synthetic resins are charged so that they are unevenly distributed on the machine side and the coke side within the coal tower.

[0011] Furthermore, the method for charging raw materials into a coke oven according to the present invention is as follows: (a) The apparent density of the synthetic resins shall be 1.1 times or more the apparent density of the raw coal. (b) The molded product of the synthetic resin shall have a spherical equivalent diameter, or the smaller of the axial length and circular cross-sectional diameter of a cylinder, whichever is 34 mm or more. These could be more preferable solutions.

[0012] The present invention, which advantageously solves the above problems, involves charging synthetic resins as coke raw materials together with raw coal into the coal tower of a coke oven, charging them into the carbonization chamber via a coal transport vehicle, and producing coke by carbonization of the coke raw materials in the carbonization chamber, wherein the apparent density of the synthetic resins among the raw coal and synthetic resins transported to the top of the coal tower is 0.70 g / cm³ 3 The charging method described above is characterized by separating the drop locations of synthetic resins and raw coal, charging the synthetic resins so that they are unevenly distributed between the machine side and the coke side within the coal tower, and charging the synthetic resins so that they are unevenly distributed between the machine side and the coke side within the carbonization chamber.

[0013] In addition, the method for producing coke according to the present invention (a) making the apparent density of the synthetic resins 1.1 times or more the apparent density of the raw coal, (b) making the molded product of the synthetic resins have a sphere-equivalent diameter, or the smaller of the axial length equivalent to a cylinder and the circular cross-section diameter be 34 mm or more, and the like can be more preferable solution means.

Effect of the Invention

[0014] In the present invention, the synthetic resins are made to have a higher density than conventional ones, further enlarged, conveyed to a coal tower together with the raw coal, and the synthetic resins and the raw coal are separated and dropped when charging the raw materials into the coal tower. Therefore, it has become possible to unevenly distribute the synthetic resins in the coal tower without newly preparing dedicated charging equipment. By unevenly distributing the synthetic resins in the coal tower, it becomes possible to unevenly distribute the synthetic resins charged into the coal car directly below, and uneven distribution of the synthetic resins in the carbonization chamber becomes possible. At this time, since the synthetic resins are arranged so as to concentrate at both ends in the longitudinal direction of the carbonization chamber, the mixing rate of the synthetic resins in other parts is reduced, and it becomes possible to suppress a decrease in the strength of the produced coke. For this reason, it becomes possible to process a larger amount of synthetic resins. Although the coke strength decreases at the end where the synthetic resins concentrate, the greatly deteriorated part is crushed into pulverized coke by the impact received in the subsequent coke conveying process and cooling treatment process (such as a coke dry fire extinguishing device, a wet fire extinguishing device, etc.). The pulverized coke is recovered and can be utilized as fuel in the sintering process of iron ore, etc.

Brief Description of the Drawings

[0015] [Figure 1] It is a schematic longitudinal sectional view for explaining a raw material charging method in a coke oven according to an embodiment of the present invention. [Figure 2] It is a schematic top view of a coal tower of a coke oven according to the above embodiment. [Figure 3] It is a schematic longitudinal sectional view for explaining a raw material charging method in a coke oven according to a conventional method.

Mode for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be specifically described. The following embodiments exemplify facilities and methods for embodying the technical idea of the present invention, and do not specify the configuration to the following. That is, the technical idea of the present invention can be variously modified within the technical scope described in the claims.

[0017] (Method of charging raw materials into a coke oven) FIGS. 1 and 2 are a schematic longitudinal sectional view and a schematic top view, respectively, for explaining a method of charging raw materials into a coke oven. In the present embodiment, when coal (raw coal) 3 and synthetic resins 2 are supplied as coke raw materials into the coke oven carbonization chamber 7, the coal 3 and the synthetic resins 2 are conveyed together to the upper part of the coal tower 1. At that time, the apparent density of the synthetic resins is set to 0.70 g / cm 3 or more. Preferably, the apparent density of the synthetic resins is set to 0.72 g / cm 3 or more. Preferably, it is increased by 10% or more from the apparent density of the conventional synthetic resins. Preferably, the molded product of the synthetic resins has a spherical equivalent diameter, or the smaller of the axial length and the circular cross-sectional diameter equivalent to a cylinder of 34 mm or more. More preferably, it is made 10% or more larger than the volume of the conventional synthetic resins. Preferably, the apparent density of the synthetic resins is set to 1.1 times or more the apparent density of the raw coal. Then, when charging into the coal tower 1 from the belt conveyor via the rotary conveyor 4, the synthetic resins having a higher density and a larger bulk than the raw coal fall farther than the raw coal. The trajectory 2A of the synthetic resins is made to reach farther than the trajectory 3A of the coal shown in FIG. 1. That is, the synthetic resins concentrate near the wall surface on 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 is that when the apparent density increases, the synthetic resins are less likely to decelerate due to air resistance when falling from the conveyor and fall far. Also, when the apparent density increases, it may become easier to roll after falling, and it is likely to concentrate near the wall surface.

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

[0019] Here, the horizontal motion of synthetic resins and coal as they are fed from the conveyor into the coal tower is represented by horizontal projection motion considering air resistance, as shown in equation (1) of equation 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 drag coefficient, and v0 is the conveyor speed. Solving equation (1), the horizontal position x is proportional to the mass m and the conveyor speed v0, and inversely proportional to the viscous drag coefficient γ, as shown in equation (2) of equation 2 below. The horizontal position x, that is, the distance traveled, is proportional to the mass m of the object and inversely proportional to the viscous drag coefficient γ. Furthermore, the mass m is determined by the density ρ and the volume V, and the viscous drag coefficient γ is correlated with the projected area. For example, in the case of a sphere, the viscous drag coefficient γ is expressed by equation (3) of equation 3 below. π is pi, r is the radius of the sphere, and η is the viscosity coefficient of air.

[0020]

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[0021] Assuming a sphere, the volume V is expressed as in equation (4) of equation 4 below. Therefore, the distance an object travels is expressed by equation (5) of equation 5 below, derived from equations (2), (3), and (4). Here, ρ is the density of the object. Thus, to increase the distance traveled, one should increase the density and radius. Although synthetic resins are often molded in a shape close to a cylinder, 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 considered that increasing the density and radius, i.e., the mass of the synthetic resin, increases the distance traveled. In other words, molded bodies of synthetic resins with higher density and mass will be placed further away than coal, which has lower density and mass.

[0022]

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

[0024] Then, coke raw materials are charged from these coal transport cars 6 into the furnace of the carbonization chamber 7 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 within the carbonization chamber 7 is as follows. Specifically, it is preferable to divide the carbonization chamber 7 into four or more equal regions along its longitudinal direction, and to charge the synthetic resins 2 in such a way that the mixing ratio of the synthetic resins 2 in the region adjacent to the coke side 8 and the region adjacent to the machine side 9 exceeds the mixing ratio of the synthetic resins 2 in the other inner regions. Furthermore, it is even more preferable that the mixing ratio is three times or more. In this case, it is preferable that the total mass of synthetic resins 2 charged in the region adjacent to the coke side 8 and the region adjacent to the machine side 9 is 75% or more of the total. At this time, the mixing ratio of synthetic resins 2 in the other inner regions will be 50% or less of the overall average mixing ratio of synthetic resins. Therefore, the decrease in strength of the coke after carbonization in that region can also be suppressed to 50% or less of what it would be if the synthetic resins 2 were evenly distributed. Although there is no upper limit to the number of region divisions in the carbonization chamber 7, considering the installation load of the raw material charging equipment, it is preferable to divide the carbonization chamber 7 into 10 divisions or less, and more preferably 6 divisions or less.

[0026] Typically, the carbonization chamber 7 of a coke oven has a long, narrow, roughly rectangular shape (for example, W0.6m × D15m × H7m). To uniformly distribute the raw materials in this carbonization chamber 7, coal is charged in through multiple coal inlets arranged along the longitudinal direction (D direction) of the carbonization chamber 7. At this time, by increasing the mixing ratio of synthetic resins charged from the charging inlet closest to the coke side 8 and machine side 9, it becomes possible to concentrate the synthetic resins 2 near the coke side 8 and machine side 9.

[0027] In this embodiment, there are no particular restrictions on the amount of synthetic resins 2 to be added to the coke oven mixed with coal 3, but from an environmental perspective, it is preferable to have an amount of 0.5% by mass or more relative to the total amount of raw materials charged into the coke oven. It is more preferable to have an amount exceeding 1.0% by mass, and even more preferable to have an amount of 3.0% by mass or more. There are no particular restrictions on the upper limit, but adding more than 5% by mass may reduce the coke strength. In particular, when adding a large amount of synthetic resins 2, it is preferable to concentrate the synthetic resins 2 in the area near the coke side 8 and machine side 9 so that the amount of synthetic resins 2 in the inner area excluding the area near the coke side 8 and machine side 9 is 1.0% by mass or less per unit of raw materials charged. More preferably, it is less than 1.0% by mass per unit of raw materials charged in the inner area excluding the area near the coke side 8 and machine side 9.

[0028] (Molded products made from synthetic resins) When synthetic resins are added by the same mass, the coke strength decreases as the number of added resins increases. When synthetic resins are carbonized in coal, they contain a large amount of volatile matter, which creates voids after evaporation, resulting in voids within the coke after carbonization. Since these voids serve as crack initiation points within the coke, it is believed that the more voids there are, the more cracks will occur, leading to a deterioration in coke strength.

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

[0030] The twin-screw extruder suitable for use in this embodiment for molding synthetic resins is arbitrary, and there is no difference in the basic structure. The supplied raw materials are kneaded by a twin-screw inside the casing, and the synthetic resins are extruded through a nozzle installed on a heated plate. The synthetic resins extruded in a cylindrical shape are cut by a rotary cutter and adjusted to a certain length. At this time, the volume per piece of the synthetic resins is adjusted by the inner diameter of the nozzle and the cutter cutting speed. Usually, a nozzle with an inner diameter of 20 to 30 mmφ is often used. By molding using a large-diameter nozzle with an inner diameter of 40 to 60 mmφ, it becomes possible to manufacture large-sized molded products. The mass of the synthetic resins per piece increases, and the loadable amount with the same number of loaded pieces can be increased.

[0031] The molded synthetic resins become cylindrical with a diameter equal to or slightly larger than the inner diameter of the nozzle, and the length thereof can be adjusted by the rotational speed of the cutter. Since the length of the molded product is affected by the position and state of the molding nozzle, it is difficult to align it to a certain length. It will be possible to distribute from short molded products to long molded products. Although the volume can be increased by increasing the maximum length of the molded product, it is preferable that the maximum length within the distribution of the molded product lengths is 200 mm or less. This is because the diameter of the charging port at the upper part of the carbonization chamber of the coke oven is about 400 to 500 mm, and if the maximum length is longer than this, there is a risk of clogging. The average volume of the molded product is preferably 90 cm 3 or more, more preferably 150 cm 3 or more, and even more preferably 200 cm 3 or more. The upper limit also depends on the size of the charging port when loading into the coke oven, but it is preferably 1000 cm 3 or less, and even more preferably 600 cm 3 or less. 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 smaller of the equivalent spherical diameter or the axial length and the circular cross-sectional diameter of the cylinder is 34 mm or more.

[0032] (Method for manufacturing coke) The molded synthetic resin products are fed into a hopper, cut out at a constant speed by a quantitative feeder, and placed on top of 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 machine side 8 within the coal tower 1. This uneven distribution is maintained while supplying to each coal car 6. Then, more synthetic resins 2 are distributed from the charging port closest to the coke side 8 and machine side 8, and less synthetic resins 2 are distributed from the other charging ports. This reduces the mixing ratio of synthetic resins 2 charged from the other charging ports, making it possible to suppress the decrease in coke strength after carbonization in that portion. As an indicator of coke strength, the drum strength can be measured according to the drum strength measurement method shown in JIS K2151:2004 Coke Test Method, where the material is charged into a drum testing machine, rotated 150 times, and then sieved with a sieve with a 15 mm mesh opening. The mass ratio on the sieve is measured as the drum strength index DI150 / 15. 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 raw coal may be performed.

[0033] Controlling the mixing ratio of synthetic resins basically involves pre-measuring the coal cutting speed and the synthetic resin cutting speed, and adjusting each cutting speed using the supply speed of the quantitative feeder or gate opening to maintain a constant ratio. Furthermore, it is difficult to directly measure the mixing ratio of synthetic resins in the longitudinal direction (direction D) of the coke oven carbonization chamber. Therefore, it can be estimated from the mixing ratio of synthetic resins in each hopper of the coal transport car at the top of the coal supply port of the carbonization chamber. This is because when raw materials are charged into a single furnace from multiple charging ports in a carbonization furnace, they are charged simultaneously from each charging port, so the mixing ratio of synthetic resins directly below each charging port is considered to be the same as the mixing ratio of synthetic resins in each hopper of the coal transport car. The mixing ratio of synthetic resins in each hopper of the coal transport car can be estimated by installing cameras above each hopper, detecting the synthetic resins through image analysis, and calculating the mass of synthetic resins charged.

[0034] The preferred cutting location for molded synthetic resin products is after passing through the coal drying facility (CMC) and at a low point on the conveyor belt. This is because, since coal is heated and dried in the CMC, adding molded synthetic resin products before the CMC could cause them to melt within the CMC. The molded synthetic resin products, along with the blended coal, pass through the coal tower and coal transport cars and are supplied to the carbonization chamber. The synthetic resins are thermally decomposed in the carbonization chamber, with some remaining as charcoal, but most are recycled as gas and tar. [Examples]

[0035] (Example of an invention) A mixture of waste plastics, mainly thermoplastic resin, was crushed, and after confirming that the moisture content was 5% or less, it was extruded from the nozzle while being heated using a twin-screw extruder, cut, and molded into a cylindrical shape. The density of the molded waste plastic product was 0.70 g / cm³. 3The above procedure was followed. After loading this into the hopper, it was cut out at a fixed rate onto the coal blending conveyor. At this time, the mixing ratio of the waste plastic molded material was adjusted to 1.5% by mass. The equipment configuration of the coke oven was the same as in Figure 1. After transporting the coal blending and waste plastic molded material together to the top of the coal tower, the loading direction was adjusted by a swivel conveyor and loaded towards the machine side. At this time, the waste plastic molded material was manufactured under the conditions shown in Table 1. After loading for a certain period of time, the direction of the swivel conveyor was adjusted and the raw material was loaded in the same way towards the coke side. As a result, the waste plastic molded material fell concentrated near the coke side inside the coal tower. These operations were repeated several times to load the raw material up to the top of the coal tower. Next, the coal transport car was moved to the bottom of the coal tower and the raw material was cut out from the coal tower. When cutting out the raw material, the inside of each hopper of the coal transport car was filmed from the top with a video camera, and the amount of waste plastic molded material loaded was estimated from the video footage. As shown in Table 1, Nos. 4-11, the proportion of waste plastics was high in hoppers near the machine side (M / S) or near the coke side (C / S), while it was very low in other hoppers. Since the raw materials from each hopper are simultaneously charged into the carbonization chamber directly below, the proportion of waste plastics in the carbonization chamber was also very high near the machine side and near the coke side. The drum strength index DI150 / 15, also shown in Table 1, ranged from 85.0 to 86.3.

[0036] (Comparative example) Manufactured in the same manner as the inventive example, with an apparent density of 0.70 g / cm³. 3Waste plastic molded material, which was less than 100%, was loaded into a hopper and cut out at a constant rate onto the coal blending conveyor, as shown in Figure 3. Next, the coal blending and waste plastic molded material were transported together to the top of the coal tower, and the loading direction was adjusted using a swivel conveyor to load it towards the machine side. At this time, the coal blending and waste plastic were cut out together from the swivel conveyor. After loading for a certain period of time, the direction of the swivel conveyor was adjusted, and the raw materials were loaded in the same way towards the coke side. These operations were repeated several times to load the raw materials up to the top of the coal tower. Next, the coal transport car was moved to the bottom of the coal tower, and the raw materials were cut out from the coal tower. When cutting out the raw materials, the inside of each hopper of the coal transport car was filmed from the top with a video camera, and the amount of waste plastic molded material loaded was estimated from the video footage. As shown in Table 1, Nos. 1 to 3, the mixing ratio of waste plastic tended to be high in hoppers near the machine side or near the coke side, but it became clear that waste plastic was also loaded into other hoppers. Since the raw materials from each hopper are simultaneously charged into the carbonization chamber directly below, the waste plastic mixing ratio within the carbonization chamber was high near the machine side and near the coke side, but the difference was not as significant as in the inventive example. The drum strength index DI150 / 15, shown in Table 1, was 84.3 or lower, which was inferior to the inventive example.

[0037] [Table 1] [Industrial applicability]

[0038] The above explanation focuses on synthetic resins, but is not limited to them. Similar effects can be obtained when synthetic resins are mixed with biomass or when synthetic resins are replaced with biomass. [Explanation of symbols]

[0039] 1 coal tower 2. (Waste Plastics) Synthetic Resins 2A (Trajectory of synthetic resins) 3 (Blend coal, coal) coking coal 3A (Coal) Trajectory 4. Swivel conveyor 6 Coal transport cars 7 Carbonization chamber 8. Machine side 9 Corkside

Claims

1. When synthetic resins are used as coke raw materials and charged into a coke oven along with raw coal via a rotating conveyor, Of the raw coal and synthetic resins transported to the top of the coal tower, the apparent density of the synthetic resins was 0.70 g / cm³. ３ By inserting it in the manner described above, The synthetic resins and coking coal are dropped in separate locations, and the synthetic resins are charged into the coal tower so that they are unevenly distributed on the machine side and the coke side. The molded product of the aforementioned synthetic resins shall have a spherical equivalent diameter, or the smaller of the axial length and circular cross-sectional diameter of a cylinder, of 30 mm or more. Method for charging raw materials into a coke oven.

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

3. The method for charging raw materials into a coke oven according to claim 1 or 2, wherein the molded product of the synthetic resins has a spherical equivalent diameter, or the smaller of the axial length and circular cross-sectional diameter of a cylinder, of 34 mm or more.

4. When synthetic resins are used as coke raw materials and charged together with raw coal into the coal tower of a coke oven via a swirling conveyor, then charged into the carbonization chamber via a coal transport car, and coke is produced by carbonization of the coke raw materials in the carbonization chamber, the apparent density of the synthetic resins among the raw coal and synthetic resins transported to the upper part of the coal tower is set to 0.70 g / cm³ or higher before charging, The synthetic resins and coking coal are dropped in separate locations, and the synthetic resins are charged into the coal tower so that they are unevenly distributed on the machine side and the coke side. In the carbonization chamber, synthetic resins are charged so that they are unevenly distributed on the machine side and the coke side. The molded product of the aforementioned synthetic resins shall have a spherical equivalent diameter, or the smaller of the axial length and circular cross-sectional diameter of a cylinder, of 30 mm or more. A method for producing coke.

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 molded product of the synthetic resins has a spherical equivalent diameter, or the smaller of the axial length and circular cross-sectional diameter of a cylinder, of 34 mm or more.

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