Method for arranging raw materials in a coke oven and method for producing coke

Abstract

To provide a technique capable of suppressing a decrease in coke strength when blending resin materials.SOLUTION: A method for arranging raw materials in a coke oven comprises, when charging molded resin materials and molded coal into the coke oven as coke raw materials together with non-molded coal, arranging the molded resin materials and the molded coal in proximity to each other. The method for arranging raw materials in the coke oven preferably comprises: unevenly distributing the molded resin materials and the molded coal in the vicinity of the M / S and the C / S of the carbonization chamber; equally dividing the carbonization chamber into four or more regions along the longitudinal direction and allocating more of the molded resin materials and the molded coal to the regions adjacent to the M / S and the C / S than to other regions; and ensuring that the sum of the amounts of the molded resin materials and the molded coal allocated to the regions adjacent to the M / S and the C / S is 75% or more of the total amount of the molded resin materials and the molded coal charged into the entire coke oven, respectively. The method for producing coke comprises dry-distilling the molded resin materials, the molded coal, and the non-molded coal charged by the method for arranging raw materials in the coke oven.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a method for recycling resins typified by waste plastics and biomass as iron-making raw materials in a coke oven. In the following description, the unit of mass "t" represents 10 3 kg. In this specification, "resins" include, in addition to used plastics, which are general waste called "synthetic resins", waste plastics that become industrial waste such as synthetic resin end materials, defective products, and used plastics generated in the manufacturing process. Further, "resins" also include so-called "biomass", which is carbonaceous material derived from plants.

Background Art

[0002] In recent years, marine pollution caused by waste plastics has become a global problem, and the amount of waste plastics flowing into the ocean is said to be approximately 8 million tons per year worldwide. The solution to marine pollution was listed as one of the goals in the "Sustainable Development Goals (SDGs)" adopted at the United Nations Summit in 2015. In response to this, in Europe, the "EU Plastic Strategy" has been announced, and efforts are being made to strengthen plastic recycling and reduce disposable plastics.

[0003] In Japan, the Container and Packaging Recycling Law was enacted in 1995, and the recycling of waste plastics has been promoted since then. In response to the growing movement to further reduce waste plastics, the "Law on Promotion of Resource Circulation of Plastics, etc." has been implemented since 2022, and further strengthening of waste plastic recycling is required. In the steel industry, a technology for recycling waste plastics as iron-making raw materials by mixing them with coal as raw materials and charging them into a coke oven has been put into practical use. It is implemented as a chemical recycling technology for waste plastics in the Container and Packaging Recycling Law.

[0004] 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.

[0005] 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.

[0006] On the other hand, a technique has been developed to improve coke strength by charging pre-formed coal into the coke oven. For example, Patent Document 2 discloses a technique for charging molded coal, which is formed from coal, into the carbonization chamber of a coke oven together with pulverized coal. This technique involves specifying the bulk density and dimensions of the molded coal and specifying the particle size composition of the pulverized coal. By eliminating segregation of the molded coal, it is said that variations in coke quality can be suppressed, and damage to the carbonization chamber refractory due to a localized increase in the amount of coal expansion during charging can be prevented.

[0007] Furthermore, Patent Document 3 discloses a coking coal segregation prevention device that can suppress the segregation of molded coal and thereby suppress the deterioration of coke quality. This segregation prevention device is installed below the charging port and has a charging control member equipped with multiple holes through which molded coal and coal pass. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2019-135281 [Patent Document 2] Japanese Patent Publication No. 2018-168296 [Patent Document 3] Japanese Patent Publication No. 2021-028387 [Non-patent literature]

[0009] [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 project] [Problems that the invention aims to solve]

[0010] However, conventional technology had the following problems: In conventional technology, the volume of granular resins is 6,000 to 200,000 mm³. 3 While it is claimed that this would have little effect on reducing coke strength, in reality, adding large amounts of granular molded plastic does cause a decrease in coke strength.

[0011] Furthermore, as described in Patent Document 1, there is a problem in that the coke strength decreases when a large amount of waste plastic is charged into the coke oven. In the technology disclosed in Patent Document 1, a problem specific to Patent Document 1 is that after the coal is charged, the raw material charging lid must be opened and molded synthetic resin products must be charged. To prevent gas leakage, the amount of gas generated must not exceed the amount of gas drawn in. However, if the amount of gas generated in the carbonization chamber increases due to fluctuations in the quality of the coal or other reasons, there is a risk that the generated gas will leak to the outside and cause abnormal combustion. In addition, because molded synthetic resin products are charged after the raw materials are charged into the coal tower, it is necessary to prepare a hopper specifically for waste plastic on top of the coal transport car. Furthermore, the increased procedure for charging raw materials is a factor that reduces the productivity of the coke oven.

[0012] Furthermore, the technologies disclosed in Patent Documents 2 and 3 are techniques for avoiding adverse effects when mixing molded charcoal, and their main focus is on preventing segregation of the molded charcoal. In addition, adopting the measures disclosed in Patent Documents 2 and 3 would increase manufacturing costs. Moreover, until now, no specific method has been considered for mixing molded charcoal to improve the deterioration of coke strength caused by mixing resins into the raw materials.

[0013] This invention has been made in view of the above circumstances, and aims to propose a method for arranging raw materials in a coke oven and a method for producing coke that can suppress the decrease in coke strength when compounding resins. [Means for solving the problem]

[0014] The present invention provides a method for arranging raw materials in a coke oven that advantageously solves the above problems. This method involves charging molded resin products and molded charcoal into the coke oven together with unmolded charcoal as coke raw materials, wherein the molded charcoal optionally contains less than 1.0% by mass of resins excluding binders, and the molded resin products and the molded charcoal are arranged in close proximity to each other.

[0015] Furthermore, the method for arranging raw materials in a coke oven according to the present invention is as follows: (a) Distributing the molded resins and the molded charcoal unevenly near the machine side and near the coke side of the carbonization chamber, (b) Divide the carbonization chamber into four or more equal regions in the longitudinal direction, and distribute more of the molded resins and molded carbon in the region adjacent to the machine side and the region adjacent to the coke side than in the other regions. (c) The sum of the amounts of the molded resins distributed to the area adjacent to the machine side and the area adjacent to the coke side is 75% or more of the total amount of the molded resins charged into the entire coke oven, and the sum of the amounts of the molten coals distributed to the area adjacent to the machine side and the area adjacent to the coke side is 75% or more of the total amount of molten coals charged into the entire coke oven. These would be more preferable solutions.

[0016] The method for producing coke according to the present invention, which advantageously solves the above problems, is characterized by carbonizing the molded products, formed coke, and non-formed coke of resins charged by any of the above raw material arrangement methods of coke ovens.

Effects of the Invention

[0017] In the present invention, it is possible to suppress the decrease in coke strength caused by adding the molded products of resins by putting formed coke together with the molded products of resins. Most of the resins are composed of volatile components. When carbonized together with coal, the volatile components escape as gas, so it is considered that holes are generated inside the coke. By arranging the molded products of resins and formed coke close to each other in the carbonization chamber, the voids generated by the gasification of the molded products of resins are absorbed by the local expansion of the formed coke, suppressing the decrease in coke strength and also suppressing the risk of furnace body damage. In addition, the restriction on the bulk specific gravity of the formed coke can also be relaxed.

[0018] In addition, the molded products of resins and formed coke are easy to roll and segregate due to their shape. However, since the adverse effects on coke strength caused by the segregation of both in the same region cancel each other out, there is no need to take special measures to prevent segregation. Therefore, by applying the present invention, the productivity of coke is improved, the life of the equipment is also improved, and it contributes to the environmental aspect, so it is industrially useful.

Brief Description of the Drawings

[0019] [Figure 1] It is a schematic diagram for explaining the raw material arrangement method of a coke oven according to an embodiment of the present invention, where (a) represents a plan view and (b) represents a side view. [Figure 2] It is a schematic diagram for explaining the raw material arrangement method of a coke oven according to another embodiment of the present invention, where (a) represents a plan view and (b) represents a side view.

Modes for Carrying Out the Invention

[0020] The embodiments of the present invention will be described in detail below. The following embodiments are illustrative of equipment and methods for realizing the technical idea of ​​the present invention, and do not limit the configuration to those described below. In other words, the technical idea of ​​the present invention can be modified in various ways within the technical scope described in the claims.

[0021] In this embodiment, for example, molded resin products formed by a twin-screw extruder are mixed with coal and used as coke raw material. In order to suppress the decrease in coke strength after carbonization, molded coal is also added as coke raw material, and the molded resin products and molded coal are placed in close proximity. The molded coal can be formed using a molding apparatus such as the one described in Patent Document 2.

[0022] Furthermore, the molded coal contains several mass percent of pitch and tars as a binder. This binder is used to improve the adhesion between coal particles during molding before charging into the coke oven, thereby improving the coke strength. Using a binder in molded coal is important for improving its strength. On the other hand, in this embodiment, the molded coal and the molded resin are placed in close proximity to counteract the expansion of the molded coal and the contraction due to the gasification of the resin. To achieve a similar effect using only molded coal, a method of incorporating resins into the molded coal separately from the binder is also conceivable. In that case, adding a large amount of resins other than binders to the molded coal will reduce the adhesion between coal particles. And even if the expansion of the molded coal can be suppressed, it will substantially lead to a decrease in coke strength. Therefore, it is preferable to limit the content of resins other than binders to less than 1.0 mass in the molded coal used in this embodiment. It is even preferable not to include any resins other than binders.

[0023] In developing the material, the inventors used waste plastic as an example of resins in a test carbonization furnace under various conditions. They mixed waste plastic and molded charcoal with coal and investigated the effect of adding waste plastic molded material on coke strength. The amount of waste plastic molded material added was identified as a major factor influencing the decrease in strength. When waste plastic is carbonized in coal, it contains a large amount of volatile matter, which creates voids after volatilization, 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.

[0024] On the other hand, molded coal is produced by compacting and molding coal that melts and expands during carbonization. By placing waste plastic and molded coal together, it was thought possible to fill the voids generated in the waste plastic during carbonization with the expansion of the molded coal. Furthermore, since biomass also contains a large amount of volatile matter, a similar effect can be obtained when biomass is included in molded resin products.

[0025] In this embodiment, a carbon material containing resins is molded, and then a predetermined amount is mixed with coal together with the molded charcoal and charged into a coke oven. The resins include not only used plastics, which are general waste, but also industrial waste plastics such as scraps and defective products of synthetic resins generated during the manufacturing process, and also include biomass.

[0026] In this embodiment, there are no particular restrictions on the amount of resin molded products added to the coke oven, but from an environmental protection standpoint, it is preferable to use as much as possible. As a guideline, the amount should be 0.1% by mass or more relative to the total amount of raw materials charged into the coke oven. There are no particular upper limits, but adding more than 20% by mass may reduce the coke strength.

[0027] In this embodiment, the amount of molded resins mixed with coal can be selected according to the size of the coke oven, the amount of resins added per unit mass of raw materials charged into the coke oven, and the required coke strength. For example, a coke oven is used in which the coal charge capacity per kettle is 30 to 40 tons, the kettle width is 35 to 50 cm, and the coke strength is 84 or higher according to the DI(150 / 15) index (index on a 15 mm sieve after 150 rotations of drum rotation strength as shown in JIS K2151:2004). When mixing molded resins in such a coke oven, it is preferable to keep the amount of resins below 20% by mass relative to the raw materials charged into the coke oven, as exceeding 20% ​​by mass results in a significant decrease in coke strength. The amount of molded resins varies depending on the amount of molded coal charged at the same time, the size of the coke oven, and the operating conditions, so it is preferable to set it individually.

[0028] (Method of arranging raw materials in a coke oven) In this embodiment, when coal, molded resins, and molded charcoal are supplied as raw materials to the carbonization chamber of a coke oven, the molded resins and molded charcoal are placed in close proximity. This allows the expansion of the molded charcoal to fill the voids created when the resins vaporize during carbonization, thereby maintaining the coke strength. As a method for placing the molded resins and molded charcoal in close proximity, for example, the molded resins and molded charcoal may be supplied to the coke oven simultaneously and separately from the charcoal to be molded.

[0029] The molded resin products are often cylindrical, for example, and the molded charcoal is often ellipsoidal. Compared to the molded charcoal, they are more prone to rolling and segregation in the coke oven. In this embodiment, as long as the molded resin products and molded charcoal are placed in close proximity, even if segregation occurs, the expansion of the molded charcoal is absorbed by the voids in the vaporized resin, thus preventing damage to the furnace body.

[0030] In this embodiment, it is preferable to arrange the molded resins and molded charcoal so that they are unevenly distributed towards the ends of the carbonization chamber in the longitudinal direction. That is, they are arranged so that the mixing ratio of resins and molded charcoal on the coke discharge side [hereinafter referred to as the coke side (C / S)] and the coke extrusion side [hereinafter referred to as the machine side (M / S)] is as high as possible. The mixing ratio of resins is calculated as a percentage based on mass, using the formula: Mass of resins / (Mass of non-molded charcoal + Mass of resins + Mass of molded charcoal) × 100. The mixing ratio of molded charcoal is calculated as a percentage based on mass, using the formula: Mass of molded charcoal / (Mass of non-molded charcoal + Mass of resins + Mass of molded charcoal) × 100.

[0031] In this embodiment, it is preferable to divide the carbonization chamber into four or more equal regions along its longitudinal direction, and to charge the resins and molded charcoal in such a way that the mixing ratio of resins and molded charcoal in the region adjacent to the coke side and the region adjacent to the machine side exceeds the mixing ratio of resins and molded charcoal in the other inner regions. Furthermore, it is even more preferable that the mixing ratio is 3 times or more in each case. In that case, it is preferable that the total mass of resins and molded charcoal charged in the region adjacent to the coke side and the region adjacent to the machine side each accounts for 75% or more of the total mass. At this time, the mixing ratio of resins and molded charcoal in the other inner regions will be 50% or less of the average mixing ratio of resins and molded charcoal. Therefore, the decrease in coke strength after carbonization in that region can be suppressed to at least 50% or less of what it would be if the resins were evenly distributed. In addition, if the molded resins and molded charcoal are placed in close proximity in that region, the decrease in coke strength will be further suppressed. While there is no upper limit on the number of divisions in the carbonization chamber, considering the installation load of the raw material charging equipment, it is preferable to divide the carbonization chamber into 10 divisions or less, and more preferably 6 divisions or less.

[0032] Typically, the carbonization chamber 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, coal is charged in through multiple coal inlets arranged along the longitudinal direction (D direction) of the carbonization chamber. At this time, by increasing the mixing ratio of resins and molded coal in the raw materials charged from the inlet closest to the coke side or machine side, it becomes possible to concentrate the resins and molded coal near the coke side and machine side.

[0033] (Method of producing coke) Molded resin products and molded coal are fed into a hopper, cut out at a constant speed by a quantitative feeder, and placed on top of coal on a belt conveyor that supplies blended coal to the coke oven. At this time, by adjusting the amount of molded resin added divided by the mass of the charged raw materials so that the value is below a certain level, it is possible to suppress the decrease in coke strength after carbonization. Furthermore, by adjusting the value of the amount of molded coal added divided by the mass of the charged raw materials, it is also possible to relax the upper limit on the amount of molded resin added.

[0034] As an indicator of coke strength, the drum strength index DI(150 / 15) can be used, following the drum strength measurement method shown in JIS K2151:2004 Coke Test Methods. The drum strength index DI(150 / 15) is measured by loading coke into a drum testing machine, rotating it 150 times, and then sieving it through a sieve with a 15 mm mesh opening, and measuring the mass ratio on the sieve. When using the drum strength index DI(150 / 15), it is preferable to keep the decrease in DI(150 / 15) to less than 1 point. This is because the DI(150 / 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 of 1 point or more in coke strength (DI(150 / 15)) is recognized as a decrease in coke strength, and operations such as improving the quality of raw coal may be performed.

[0035] The amount of resin added to molded products can be measured by installing a camera above the conveyor belt after the product has been added, taking pictures, and performing image analysis. A simpler method would be to measure the mass of multiple individual resin molded products. The amount of molded carbon added can be evaluated in a similar manner.

[0036] The preferred cutting location for resin molded 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 resin molded products before the CMC could cause them to melt within the CMC. The resin molded products, along with the blended coal, pass through the coal tower and coal transport car and are supplied to the carbonization chamber. The resins and biomass are thermally decomposed in the carbonization chamber, with some remaining as charcoal, but much of it being produced as by-products such as gas and tar.

[0037] The cutting position for the molded charcoal can be the same as for molded resin products. However, unlike molded resin products, there is no risk of melting, so it is acceptable to cut it before the CMC (Chemical Molding Condensation) process. [Examples]

[0038] A mixture of waste plastics, mainly thermoplastic resin, was crushed and molded into a cylindrical shape using a twin-screw extruder. In addition, coal was molded into a masec type using a double-roll molding machine as described in Patent Document 2. The resulting waste plastic molded product was mixed with the amount a [mass%] shown in Table 1, and the molded coal was mixed with the amount b [mass%] shown in Table 1, as an internal component of the blended coal used as coke raw material. Furthermore, when waste plastic was added to the molded coal, the amount shown in Table 1 (resin content [mass%]) was mixed in as an internal component of the molded coal.

[0039] (Even distribution) In arranging the waste plastic molded products and molded charcoal, the amount of blended charcoal was divided into eight parts, and first, 1 / 8 of the blended charcoal was spread in the carbonization vessel. Then, predetermined amounts (1 / 4 of the planned amount) of waste plastic molded products and molded charcoal were placed at 1 / 4 and 3 / 4 positions in the length and width directions from one end of the carbonization vessel. Next, another 1 / 8 of the blended charcoal was charged in, resulting in a charged charcoal density of 830 kg / m³. 3 The material was compacted in this manner. This process was repeated four times, and when the carbonization vessel 3 was divided into four sections along its longitudinal direction, the mixing ratio of waste plastic molded material and molded charcoal was made the same in each section. Figure 1 shows an example in which waste plastic molded material 1 and molded charcoal 2 are evenly distributed in close proximity to the unmolded charcoal 3 and filled into the carbonization vessel 4.

[0040] (segregation arrangement) When arranging the waste plastic molded products and molded charcoal, the amount of blended charcoal was divided into eight parts, and first, 1 / 8 of the blended charcoal was spread in the carbonization vessel. Then, a predetermined amount (1 / 4 of the planned amount) of waste plastic molded products and molded charcoal was arranged so that it was in contact with one end of the longitudinal direction of the carbonization vessel. Next, another 1 / 8 of the blended charcoal was charged in, resulting in a charged charcoal density of 830 kg / m³. 3 The material was compacted in this manner. This process was repeated four times, and the waste plastic molded material and molded charcoal were arranged so that they were unevenly distributed at one end of the can in the longitudinal direction. Figure 2 shows an example in which the waste plastic molded material 1 and molded charcoal 2 are segregated and placed close to the unmolded charcoal 3 and filled into the carbonization can 4.

[0041] The moisture content of the blended coal was adjusted to 8%. After carbonization at 700-1100°C for 20 hours, water was poured from above to rapidly cool it, and then it was dried to obtain coke. The obtained coke was measured according to the drum strength measurement method shown in JIS K2151:2004 Coke Test Methods. After being charged into a drum testing machine and rotated 150 times, the mass percentage on the sieve was sieved through a 15 mm mesh sieve and the drum strength index DI(150 / 15) was measured.

[0042] Table 1 shows the relationship between the amount of waste plastic molded material added (a), the amount of molded charcoal added (b), the arrangement method, and the change in coke DI strength ΔDI (150 / 15). In the arrangement column, "evenly isolated" means that the molded material or molded charcoal is evenly distributed individually. "Evenly close together" means that the molded material and molded charcoal are evenly distributed in close proximity. "Segregated isolation" means that the molded material or molded charcoal is segregated and distributed individually. "Segregated close together" means that the molded material and molded charcoal are segregated and distributed in close proximity. The segregation rate indicates the proportion of waste plastic molded material or molded charcoal present in the regions at both ends when the carbonization tank is divided into four sections along its length. Furthermore, the expansion evaluation is an assessment of whether the tank was damaged due to the expansion of the raw material by observing the tank after carbonization. A "◎" indicates that the tank retains its original shape. A "〇" indicates that the tank is slightly bulging but undamaged. A "△" indicates that the tank is bulging and damaged. A "×" mark indicates a can that is significantly bulging and damaged. For waste plastic molded products and molded charcoal, segregation countermeasures are necessary to ensure even distribution, and are therefore marked "Required". Others are marked "Not Required".

[0043] For the overall evaluation, the standard condition of not including waste plastic molded products or molded charcoal was set to C. If the DI strength decreased by 0.5 points or more from the standard condition, or if the expansion evaluation was "△" or "×", it was set to E. If the decrease in DI strength was less than 0.5 points and the expansion evaluation was "〇", it was set to D. If the DI strength improved and the expansion evaluation was "〇", it was set to B. If the improvement in DI strength was less than 0.5 points and the expansion evaluation was "◎", it was also set to B. If the improvement in DI strength was 0.5 points or more and the expansion evaluation was "◎", it was set to A.

[0044] [Table 1]

[0045] The results in Table 1 show that tests No. 9-17, in which molded resin products and molded charcoal were placed in close proximity, allowed for the production of coke without deteriorating expandability, while suppressing or improving the decrease in coke strength. In particular, by segregating the molded resin products and molded charcoal in close proximity, coke strength could be improved even when a large amount of molded resin products (3-20% by mass) were incorporated. When molded resin products and molded charcoal were segregated, it was found that a segregation rate of 75% or more resulted in a high effect in improving coke strength. By placing molded resin products in close proximity to the mass of molded charcoal in an amount exceeding 10% by mass, excellent expandability was achieved.

[0046] In tests No. 2-6, which contained only molded resins, the coke strength decreased significantly. In tests No. 7 and 8, which contained only molded charcoal and were segregated, the cans broke. In test No. 18, which contained only molded charcoal and was evenly distributed, the coke strength improved the most, but the can expanded. In test No. 19, the coke strength decreased and the can broke. In test No. 20, no significant decrease in coke strength was observed, but the can expanded slightly. [Explanation of Symbols]

[0047] 1 (Waste Plastic) Molded Product 2 Molded coal 3 Unmolded coal 4. Carbonization chamber

Claims

1. When charging molded resin products and molded coal into a coke oven along with unmolded coal as coke raw materials, The molded charcoal contains, optionally, less than 1.0% by mass of resins excluding the binder. The molded resin products and the molded charcoal are unevenly distributed near the machine side and near the coke side of the carbonization chamber, and the molded resin products and the molded charcoal are placed in close proximity to each other. Here, "binder" refers to a substance containing at least one of pitch and tars, used in molded coal to improve the adhesion between coal particles. Method of arranging raw materials in a coke oven.

2. The method for arranging raw materials in a coke oven according to claim 1, wherein the carbonization chamber is equally divided into four or more regions in the longitudinal direction, and more of the molded resin products and molded charcoal are distributed to the region adjacent to the machine side and the region adjacent to the coke side than to the other regions.

3. The sum of the amounts of the molded resins distributed to the area in contact with the machine side and the area in contact with the coke side is 75% or more of the total amount of the molded resins charged into the entire coke oven. The coke oven raw material arrangement method according to claim 2, wherein the sum of the amounts of molded coal distributed to the area in contact with the machine side and the area in contact with the coke side is 75% or more of the total amount of molded coal charged into the entire coke oven.

4. A method for producing coke, comprising carbonizing molded resin products, molded charcoal, and unmolded charcoal charged by a coke oven raw material arrangement method described in any one of claims 1 to 3.

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