Method for wet quenching of red-hot coke

Abstract

To provide a method for wet-extinguishing red-hot coke, capable of sufficiently extinguishing the red-hot coke over the whole area.SOLUTION: The wet fire extinguishing method includes a pushing step, a moving step, and a fire extinguishing step. In the extrusion step, the red-hot coke (C) is extruded from a coke discharge oven port of the carbonization chamber and stored in a fire extinguishing bucket (31). In the moving step, the fire extinguishing bucket (31) containing the red hot coke (C) is moved to the positions of the plurality of water sprinkling pipes (40a, 40b, 40c). In the fire extinguishing step, water is injected from the water injection holes (40h) of the plurality of water sprinkling pipes (40a, 40b, 40c) to the red-hot coke (C) in the fire extinguishing bucket (31) to extinguish fire. In a fire extinguishing process, the fire extinguishing bucket (31) is moved forward in the arrangement direction of the battery with respect to the water sprinkling pipes (40a, 40b, 40c), and moved backward after the forward movement.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present disclosure relates to a method for wet quenching of red-hot coke, in which red-hot coke produced in a coke oven is quenched by wet quenching. [Background technology]

[0002] Coke ovens are used to produce coke, one of the raw materials used in steelmaking. A coke oven is composed of multiple coking chambers and multiple combustion chambers. Specifically, a coke oven includes a battery of furnaces arranged in one direction, and each battery is composed of multiple coking chambers and multiple combustion chambers. In each battery, the combustion chambers are arranged in the direction of the battery arrangement, and the coking chambers are located between the combustion chambers. In the horizontal plane of a coke oven, the direction of the battery arrangement, i.e., the direction of the coking chambers and combustion chambers, is also referred to as the battery direction, and the direction perpendicular to the battery direction, i.e., the direction in which the coking chambers and combustion chambers extend, is also referred to as the furnace length direction. In the coking chamber, coal is carbonized by heat from the combustion chamber to produce red-hot coke. The coking chamber is sometimes called a kiln because it is the place where the product to be produced, i.e., red-hot coke, is produced.

[0003] The red-hot coke produced in the carbonization chamber is pushed out of the carbonization chamber in the furnace length direction by an extruder. Specifically, the ram head of the extruder is inserted into the carbonization chamber from one of the chamber's openings (the extruder-side opening) and moves through the carbonization chamber in the furnace length direction toward the other opening (the guide car-side opening). The red-hot coke in the carbonization chamber is pushed by the ram head moving through the carbonization chamber and discharged from the guide car-side opening of the carbonization chamber. For this reason, the guide car-side opening in the carbonization chamber is also called the coke discharge opening. During the extrusion operation, a guide car and a fire truck wait outside the coke discharge opening in the furnace length direction. The red-hot coke discharged from the carbonization chamber is collected in the fire truck's fire bucket via the guide car. The fire bucket collects the red-hot coke pushed out of the carbonization chamber as it moves toward the furnace battery. This ensures a uniform deposition level of the red-hot coke collected in the fire bucket. The red-hot coke is contained in the fire bucket and extinguished for safe transport to the blast furnace.

[0004] Methods for quenching red-hot coke are broadly divided into wet quenching and dry quenching. In wet quenching, red-hot coke is extinguished by spraying water. Therefore, the coke contains moisture immediately after wet quenching. On the other hand, in dry quenching, red-hot coke is extinguished with an inert gas such as nitrogen. Therefore, the coke contains almost no moisture immediately after dry quenching. Here, in blast furnace operation, in order to improve productivity, reduce fuel costs, and suppress greenhouse gas emissions, it is preferable that the coke has a low moisture content when supplied to the blast furnace. Dry quenching is effective from the perspective of preventing the coke from containing moisture immediately after quenching. However, wet quenching is still used due to the complexity of dry quenching equipment, etc. Furthermore, when dry quenching equipment is shut down for an extended period of time for repairs, an adjacent wet quenching equipment is often used.

[0005] When wet quenching is used as a method of extinguishing red-hot coke in a coke oven, wet quenching equipment (hereinafter simply referred to as "fire extinguishing equipment") is usually located at the end of the guide car rails and fire car rails that extend toward the oven battery outside the coke discharge port in the oven length direction. In other words, the fire extinguishing equipment is located outside the coke oven in the oven battery direction. During wet quenching, the fire extinguishing bucket containing the red-hot coke is towed by a fire extinguishing car along the fire car rails and moved to the position of the fire extinguishing equipment. The fire extinguishing equipment has multiple spray nozzles located directly above the fire extinguishing bucket, and sprays water from the spray nozzles onto the red-hot coke in the fire extinguishing bucket. This wet quenches the red-hot coke in the fire extinguishing bucket.

[0006] However, in the case of a fire extinguishing system located outside the coke oven battery, the fire extinguishing vehicle must travel a long distance to the fire extinguishing system, and after wet quenching, the fire extinguishing vehicle must also travel a long distance to the wharf. The longer the travel distance of the fire extinguishing vehicle, the longer the travel time, which causes a decrease in coke productivity. Furthermore, the fuel consumption required to run the fire extinguishing vehicle increases. Furthermore, the longer the travel time of the fire extinguishing vehicle to the fire extinguishing system, the lower the coke yield. This is because the red-hot coke is in a burning state while the fire extinguishing vehicle is traveling to the fire extinguishing system, and as the travel time of the fire extinguishing vehicle increases, some of the coke is burned.

[0007] A technology for resolving such disadvantages of wet quenching is described in Japanese Patent Application Laid-Open No. 2019-183166 (Patent Document 1). In the technology described in Patent Document 1, quenching equipment is placed in a central position in the direction of the furnace battery of the coke oven. This quenching equipment is equipped with sprinkler pipes arranged at different heights in two to four stages directly above or near the lower end of the inclined bottom plate of the coke loading box (fire bucket). Furthermore, in this quenching equipment, when the area containing the red-hot coke in the fire bucket is divided into end A, a center, and end B in the direction of travel of the fire truck, the portions of each sprinkler pipe corresponding to end A, the center, and end B are connected to each other via loose flanges, and the sprinkler angle of each portion is set for each location.

[0008] The technology of Patent Document 1 allows the fire extinguishing equipment to be located in the center of the coke oven toward the furnace battery, which shortens the travel distance and travel time of the fire extinguishing vehicle to the fire extinguishing equipment compared to when the fire extinguishing equipment is located on the outer side of the coke oven toward the furnace battery. This improves coke productivity, reduces fuel consumption for running the fire extinguishing vehicle, and prevents a decrease in coke yield. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] Japanese Patent Application Publication No. 2019-183166 Summary of the Invention [Problem to be solved by the invention]

[0010] Even if the spray angles of the spray pipes in Patent Document 1 are set for each of the end A, center, and end B portions of the red-hot coke area in the refueling bucket, there may still be areas where the red-hot coke is insufficiently extinguished. This is because the deposition state of the red-hot coke contained in the refueling bucket is not always the same but fluctuates. For example, depending on the flow behavior, the red-hot coke may be deposited unevenly on the coke oven side of the refueling bucket or on the opposite side of the refueling bucket. Furthermore, the red-hot coke may crumble within the refueling bucket and deposit over a wide area, or it may remain intact and deposit over a narrow area. The deposition state of the red-hot coke depends on the moving speed of the ram head, the moving speed of the refueling bucket, or the shape of the refueling bucket (e.g., the inclination angle of the bottom plate). While it would be ideal if the spray angle could be adjusted according to the deposition state of the red-hot coke, it is not practical to adjust the spray angle while monitoring the state of the red-hot coke.

[0011] An object of the present disclosure is to provide a wet quenching method for red-hot coke that reliably extinguishes the entire area of ​​the red-hot coke and then produces coke with a low moisture content. [Means for solving the problem]

[0012] The wet quenching method for red-hot coke according to the present disclosure is a method for quenching red-hot coke produced in a coke oven using a wet quenching device. The coke oven includes a battery of ovens arranged in one direction. The battery is composed of combustion chambers arranged in the one direction and a carbonization chamber arranged between the combustion chambers. The wet quenching device includes a quenching bucket and multiple sprinkler pipes. The quenching bucket is configured to be movable in the direction of the oven battery arrangement outside the coke discharge opening of the carbonization chamber. The multiple sprinkler pipes are provided between the oven batteries outside the coke discharge opening, on the opposite side of the coke discharge opening from the quenching bucket. Each of the multiple sprinkler pipes extends in the direction of the oven battery arrangement and is spaced apart vertically from one another. Each of the multiple sprinkler pipes has water injection holes facing diagonally downward and arranged in a region corresponding to the length of the quenching bucket in the direction of the oven battery arrangement, and is divided into a first end, a central portion, and a second end along the direction of the oven battery arrangement. In each of the plurality of sprinkler pipes, the angle of inclination of the water injection holes at the center with respect to the horizontal plane is different from the angles of inclination of the water injection holes at the first end and the second end with respect to the horizontal plane.

[0013] The wet quenching method includes a pushing process, a moving process, and a quenching process. In the pushing process, the red-hot coke is pushed out from the coke discharge opening of the carbonization chamber and stored in a quenching bucket. In the moving process, the quenching bucket storing the red-hot coke is moved to the position of multiple sprinkler pipes. In the quenching process, water is sprayed from the water spray holes of the multiple sprinkler pipes onto the red-hot coke in the quenching bucket to extinguish the fire. In the quenching process, the quenching bucket is moved forward relative to the multiple sprinkler pipes in the direction of the furnace battery arrangement, and then moved backward after the forward movement. [Effects of the Invention]

[0014] According to the wet quenching method of the present disclosure, it is possible to reliably quench the red-hot coke over the entire area and produce coke with a low moisture content. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. 1 is a schematic diagram of a coke oven and its peripheral equipment as seen from the side. [Figure 2] FIG. 2 is a schematic diagram of a coke oven and its peripheral equipment as viewed from above. [Figure 3] FIG. 3 is a schematic diagram showing the configuration of a wet fire extinguishing device. [Figure 4] FIG. 4 is a cross-sectional view of a sprinkler pipe. [Figure 5] FIG. 5 is a schematic diagram showing the configuration of a wet fire extinguishing device and the wet fire extinguishing process. [Figure 6] FIG. 6 is a diagram showing an example of the state of deposition of red-hot coke contained in a fire bucket. DETAILED DESCRIPTION OF THE INVENTION

[0016] In order to solve the above problems, the inventors conducted extensive research based on the premise that the fire extinguishing equipment, i.e., multiple sprinkler pipes, are arranged in the center of the coke oven toward the furnace battery, that each sprinkler pipe extends toward the furnace battery and is divided into one end, a center, and the other end, and that the sprinkler angle at the center of each sprinkler pipe is different from the sprinkler angle at each end. As a result, the inventors have made the following findings.

[0017] When wet quenching is performed by spraying water from a spray pipe onto the red-hot coke in the quenching bucket, if the quenching bucket is held in a fixed position, the amount of water sprayed on each area of ​​the red-hot coke is always constant. In this case, the area of ​​the red-hot coke where the amount of water sprayed is low always has a low amount of water sprayed, and the area of ​​the red-hot coke where the amount of water sprayed is high always has a high amount of water sprayed. As a result, the area of ​​the red-hot coke where the amount of water sprayed is low may not be sufficiently quenched. Furthermore, the area of ​​the red-hot coke where the amount of water sprayed is high may contain excessive moisture.

[0018] Therefore, during wet quenching, the quenching bucket is moved forward toward the furnace battery relative to each spray pipe, and then moved backward after the forward movement. In this case, the amount of water sprayed on each area of ​​the red-hot coke changes depending on the movement of the quenching bucket. This allows water to be sprayed over the entire area of ​​the red-hot coke, making the coke temperature more uniform after spraying. As a result, it is possible to sufficiently quench the red-hot coke over the entire area, and coke with a low moisture content can be produced.

[0019] The method for wet quenching of red-hot coke according to an embodiment of the present disclosure has been completed based on the above findings.

[0020] A wet quenching method for red-hot coke according to an embodiment of the present disclosure is a method for quenching red-hot coke produced in a coke oven using a wet quenching device. The coke oven includes a battery of ovens arranged in one direction. The battery is composed of combustion chambers arranged in the one direction and a carbonization chamber arranged between the combustion chambers. The wet quenching device includes a quenching bucket and multiple sprinkler pipes. The quenching bucket is configured to be movable in the direction of the oven battery arrangement outside the coke discharge opening of the carbonization chamber. The multiple sprinkler pipes are provided between the oven batteries outside the coke discharge opening, on the opposite side of the coke discharge opening from the quenching bucket. Each of the multiple sprinkler pipes extends in the direction of the oven battery arrangement and is spaced apart vertically. Each of the multiple sprinkler pipes has water injection holes facing diagonally downward and arranged in a region corresponding to the length of the quenching bucket in the direction of the oven battery arrangement. The multiple sprinkler pipes are divided into a first end, a central portion, and a second end along the direction of the oven battery arrangement. In each of the plurality of sprinkler pipes, the angle of inclination of the water injection holes at the center with respect to the horizontal plane is different from the angles of inclination of the water injection holes at the first end and the second end with respect to the horizontal plane.

[0021] The wet quenching method includes a pushing process, a moving process, and a quenching process. In the pushing process, the red-hot coke is pushed out from the coke discharge opening of the carbonization chamber and stored in a quenching bucket. In the moving process, the quenching bucket storing the red-hot coke is moved to the position of multiple sprinkler pipes. In the quenching process, water is sprayed from the water spray holes of the multiple sprinkler pipes onto the red-hot coke in the quenching bucket to extinguish the fire. In the quenching process, the quenching bucket is moved forward relative to the multiple sprinkler pipes in the direction of arrangement of the furnace battery, and then moved backward after the forward movement (first configuration).

[0022] The wet quenching method according to the first configuration wet quenches red-hot coke through a series of steps, including a pushing step, a moving step, and a quenching step. In the quenching step, water is sprayed from the water injection holes of multiple sprinkler pipes onto the red-hot coke in the quenching bucket to extinguish the quench. Here, each sprinkler pipe is installed between the furnace batteries outside the coke discharge port, on the opposite side of the quenching bucket from the coke discharge port. That is, each sprinkler pipe is arranged between the furnace batteries of the coke ovens. Each sprinkler pipe extends in the direction of the arrangement of the furnace batteries, i.e., in the direction of the furnace battery, and is spaced apart vertically. The water injection holes of each sprinkler pipe are arranged in a region corresponding to the length of the quenching bucket in the direction of the furnace battery and face diagonally downward. Furthermore, each sprinkler pipe is divided into a first end portion, a central portion, and a second end portion along the direction of the furnace battery, and the inclination angle of the water injection hole in the central portion is different from the inclination angle of the water injection holes at the first end portion and the second end portion.

[0023] In the wet quenching method according to the first configuration, the red-hot coke pushed out of the carbonization chamber in the pushing step is placed in a quench bucket, and the moving step moves the quench bucket containing the red-hot coke to the positions of the spray pipes. Then, in the quenching step, while wet quenching is performed by spraying water from the spray pipes onto the red-hot coke in the quench bucket, the quench bucket is moved forward toward the furnace battery relative to the spray pipes, and then moved backward after the forward movement. In this case, as described above, the amount of water sprayed on each area of ​​the red-hot coke changes in accordance with the movement of the quench bucket. This allows water to be sprayed over the entire area of ​​the red-hot coke, making the coke temperature more uniform after spraying. As a result, the red-hot coke can be sufficiently extinguished over the entire area, and coke with a low moisture content can be produced.

[0024] The wet fire extinguishing method preferably has the following configuration (second configuration): In each of the plurality of sprinkler pipes, the inclination angle of the water injection holes in the central portion is larger than the inclination angles of the water injection holes at the first end and the second end.

[0025] Since the red-hot coke in the quenching bucket is most abundant in the central region in the direction of the oven battery, spraying water on this region is the most important. In the wet quenching method according to the second configuration, the red-hot coke in the quenching bucket is sprayed with water more vigorously in the region on the opposite side of the coke oven in the direction of the oven length in the central region in the direction of the oven battery, and in the region on the coke oven side in the direction of the oven length in the regions at both ends in the direction of the oven battery.

[0026] If the number of sprinkler pipes is small, it is not possible to adequately control the amount of water sprayed in the furnace length direction, making it difficult to uniformize the temperature distribution of the coke after quenching. On the other hand, if the number of sprinkler pipes is too large, a large space is required to install the sprinkler pipes. In addition, sprinkler control becomes complicated. For this reason, multiple sprinkler pipes are required. Therefore, in the above wet quenching method, it is practically preferable that the number of sprinkler pipes is three (third configuration). However, the number of sprinkler pipes may be two, four or more.

[0027] The above-mentioned wet fire extinguishing method preferably has the following configuration (fourth configuration). When the length of the central part of the water spray pipe in the direction of the furnace battery arrangement is L, the fire extinguishing process includes a main fire extinguishing process, a first auxiliary fire extinguishing process, and a second auxiliary fire extinguishing process. In the main fire extinguishing process, water is sprayed from the water injection holes while the center point of the fire extinguishing bucket coincides with the center point of the central part of the water spray pipe in the direction of the furnace battery arrangement. In the first auxiliary fire extinguishing process, water is sprayed from the water injection holes while the fire extinguishing bucket is moved forward a distance D that satisfies formula (1) from its position in the main fire extinguishing process in the direction of the furnace battery arrangement. In the second auxiliary fire extinguishing process, water is sprayed from the water injection holes while the fire extinguishing bucket is moved backward a distance "2 x D" from its position in the first auxiliary fire extinguishing process in the direction of the furnace battery arrangement. L / 20≦D≦L / 2 (1)

[0028] According to the wet quenching method of the fourth aspect, in the quenching process, the quenching bucket moves forward and backward over a minimum distance to thoroughly extinguish the entire area of ​​the red-hot coke. Therefore, it is possible to produce coke with a low moisture content while reliably extinguishing the red-hot coke sufficiently and suppressing excessive water spraying. It is also possible to minimize the fuel consumption of the fire truck.

[0029] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. In each drawing, the same or equivalent components are designated by the same reference numerals, and redundant description will not be repeated.

[0030] [Coke ovens and related facilities] The basic configuration of a coke oven and its peripheral equipment will be described with reference to Figures 1 and 2. Figure 1 is a schematic diagram of a coke oven and its peripheral equipment as viewed from the side. In other words, Figure 1 is a schematic diagram of a coke oven and its peripheral equipment as viewed along the oven length direction. Figure 2 is a schematic diagram of a coke oven and its peripheral equipment as viewed from above.

[0031] The coke oven 1 includes a plurality of oven batteries 10 arranged in one direction. This one direction is the direction in which the oven batteries are arranged, i.e., the oven battery direction. The oven battery 10 is composed of a number of coking chambers 11 and a number of combustion chambers 12. In the oven battery 10, the combustion chambers 12 are arranged in the oven battery direction, and the coking chambers 11 are arranged between the combustion chambers 12. In other words, the coking chambers 11 are arranged so that they alternate with the combustion chambers 12 in the oven battery direction.

[0032] The carbonization chamber 11 has an extruder-side kiln opening at one end in the furnace length direction, and a guide car-side kiln opening, i.e., a coke discharge kiln opening 11a, at the other end in the furnace length direction. An extruder (not shown) is arranged outside the extruder-side kiln opening in the furnace length direction. Meanwhile, a guide car 2 (Fig. 1) and a fire extinguishing car 3 are arranged outside the coke discharge kiln opening 11a in the furnace length direction. Specifically, a guide car rail 20 (Fig. 2) is laid outside the coke discharge kiln opening 11a in the furnace length direction, and a fire extinguishing car rail 30 is laid outside the guide car rail 20 in the furnace length direction. The guide car rail 20 and the fire extinguishing car rail 30 are adjacent to the coke oven 1 and extend toward the furnace battery. The guide car 2 is arranged to be movable on the guide car rail 20 toward the furnace battery. The fire truck 3 is provided so as to be movable in the direction of the furnace battery on the fire truck rail 30. The fire truck 3 includes a fire bucket 31. The fire bucket 31 is towed by the fire truck 3 and moves in the direction of the furnace battery on the fire truck rail 30. The pusher, like the guide vehicle 2 and the fire truck 3, is also provided so as to be movable in the direction of the furnace battery.

[0033] In the coke oven 1 configured as described above, coal, which is the raw material for coke, is charged into the carbonization chamber 11. Combustion gas is burned in the combustion chamber 12, and the heat in the combustion chamber 12 is supplied to the carbonization chamber 11 by thermal conduction. The coal in the carbonization chamber 11 is carbonized by the heat from the combustion chamber 12 to become red-hot coke C. Red-hot coke C means coke in a red-hot combustion state.

[0034] The red-hot coke C produced in the carbonization chamber 11 is pushed out from the coke discharge kiln opening 11a of the carbonization chamber 11 by an extruder. At this time, a guide vehicle 2 and a fire extinguishing vehicle 3 are waiting outside the longitudinal direction of the coke discharge kiln opening 11a. The red-hot coke C (Figure 1) discharged from the carbonization chamber 11 is guided by the guide vehicle 2 to the ignition bucket 31 of the fire extinguishing vehicle 3 and stored in the ignition bucket 31. The ignition bucket 31 stores the red-hot coke C pushed out from the carbonization chamber 11 while moving toward the furnace battery. This ensures that the accumulation level of the red-hot coke C stored in the ignition bucket 31 is uniform.

[0035] The coke oven 1 is provided with a wet quenching booth 4 as quenching equipment for wet quenching the red-hot coke C. The wet quenching booth 4 is provided between the furnace batteries 10, 10 on the outer side of the coke discharge kiln port 11a in the furnace length direction. The wet quenching booth 4 is arranged within the paths of the guide car rail 20 and the fire extinguisher rail 30. The wet quenching booth 4 only needs to be provided between the furnace batteries 10, 10, and there are no particular restrictions on which furnace batteries 10, 10 it is provided between. However, it is preferable that the wet quenching booth 4 be provided between the furnace batteries 10, 10 located at the center of the coke oven 1 in the furnace battery direction.

[0036] The wet fire extinguishing booth 4 includes a plurality of sprinkler pipes 40a, 40b, and 40c. In this embodiment, the number of sprinkler pipes 40a, 40b, and 40c is three. As shown in FIG. 2 , the sprinkler pipes 40a, 40b, and 40c are provided on the opposite side of the fire bucket 31, i.e., the fire truck rail 30, from the coke discharge kiln opening 11a. Therefore, the sprinkler pipes 40a, 40b, and 40c do not interfere with the fire truck 3 and the fire bucket 31 when they are traveling (moving). In addition, the wet fire extinguishing booth 4 is open toward the furnace battery so as not to interfere with the guide vehicle 2 and the fire truck 3 when they are traveling (moving). The specific configurations of the wet fire extinguishing booth 4 and the sprinkler pipes 40a, 40b, and 40c will be described later.

[0037] The red-hot coke C pushed out of the carbonization chamber 11 and stored in the quenching bucket 31 is extinguished in the wet quenching booth 4. At this time, first, the quenching bucket 31 storing the red-hot coke C is moved to the wet quenching booth 4 by the fire truck 3. In the wet quenching booth 4, water is sprayed from the water spray pipes 40a, 40b, and 40c onto the red-hot coke C in the quenching bucket 31. This extinguishes the red-hot coke C, turning it into wet-quenched coke. Usually, the amount of coke in this state is extremely large, about 20 to 30 tons, and it is difficult to completely uniformize its temperature, but its temperature is generally above 60°C and below 400°C.

[0038] A plurality of wharves 5 are provided near the coke oven 1 to dry the coke in a wet quenched state. The wharves 5 are provided adjacent to a rail 30 for a fire extinguisher vehicle.

[0039] When the extinguishing of the red-hot coke C is completed in the wet quenching booth 4, the fire truck 3 moves the fire bucket 31 containing the coke in a wet quenching state to the wharf 5 area. Then, the discharge gate of the fire bucket 31 is opened for one of the wharves 5. This causes the coke in the fire bucket 31 to be discharged to the wharf 5. In the wharf 5, the coke is cooled in dry air, and the moisture contained in the coke evaporates. After the coke has cooled sufficiently, the coke CA is placed on a transport facility 6 such as a belt conveyor and transported to the blast furnace.

[0040] In this embodiment, the red-hot coke C pushed out from the carbonization chamber 11 and stored in the fire extinguishing bucket 31 is extinguished by a wet fire extinguishing device including some of the above-mentioned elements. Specifically, the wet fire extinguishing device includes the fire extinguishing bucket 31 and a plurality of spray pipes 40a, 40b, and 40c. The fire extinguishing truck 3 and the wet fire extinguishing booth 4 are also included in the wet fire extinguishing device.

[0041] [Wet fire extinguishing device and wet fire extinguishing method] A wet fire quenching device and a wet fire quenching method will be described with reference to Figures 3 to 5. The wet fire quenching method according to this embodiment includes a pushing process, a moving process, and a fire quenching process. As described above, the pushing process pushes out the red-hot coke C from the coke discharge kiln opening 11a of the carbonization chamber 11 and stores it in the fire quenching bucket 31. The moving process moves the fire quenching bucket 31 storing the red-hot coke C to the positions of the multiple spray pipes 40a, 40b, and 40c.

[0042] FIG. 3 is a schematic diagram showing the configuration of a wet fire quenching system, illustrating the spray pipes 40a, 40b, and 40c spraying water onto the red-hot coke C in the fire quenching bucket 31. FIG. 3 shows the wet fire quenching system as viewed along the furnace length. FIG. 4 is a cross-sectional view of the spray pipes 40a, 40b, and 40c. FIG. 4 shows a cross-section of the spray pipes 40a, 40b, and 40c cut along a plane perpendicular to the furnace length. FIG. 5 is a schematic diagram showing the configuration of the wet fire quenching system and the wet fire quenching process. In FIG. 5, the left column shows the wet fire quenching system as viewed along the furnace length, and the right column shows the wet fire quenching system as viewed from above. FIG. 5 also shows the appearance of the spray pipes 40a, 40b, and 40c.

[0043] Referring to FIG. 3, the wet fire extinguishing booth 4 includes three sprinkler pipes 40a, 40b, and 40c. The sprinkler pipes 40a, 40b, and 40c are provided on the opposite side of the fire extinguishing bucket 31 from the coke discharge kiln port 11a, i.e., on the opposite side of the coke oven. Each of the sprinkler pipes 40a, 40b, and 40c extends in the direction of the furnace battery arrangement (furnace battery direction). The sprinkler pipes 40a, 40b, and 40c are arranged spaced apart from one another in the vertical direction. That is, in this embodiment, three sprinkler pipes 40a, 40b, and 40c are provided: an upper sprinkler pipe 40a, a middle sprinkler pipe 40b, and a lower sprinkler pipe 40c.

[0044] Here, the fire bucket 31 is box-shaped with an open top and has a rectangular shape when viewed from above. The bottom plate 311 of the fire bucket 31 is inclined downward as it moves away from the coke oven 1. The inclination angle θ of the bottom plate 311 is, for example, 15°. In the fire bucket 31, the part of the bottom plate 311 located on the opposite side of the coke oven moves downward, creating a space between the bottom plate 311 and the side plate 312, and the coke is discharged into the wharf 5.

[0045] 4 and 5, each of the sprinkler pipes 40a, 40b, and 40c has a number of water injection holes 40h that open toward the coke oven. The water injection holes 40h open diagonally downward. As shown in FIG. 5, the water injection holes 40h are arranged in an area corresponding to the length of the fire bucket 31 in the direction of the furnace battery. In this embodiment, the water injection holes 40h are arranged in two rows. That is, the water injection holes 40h are composed of an upper row of water injection holes 40h and a lower row of water injection holes 40h. As shown in FIG. 4, the water injection holes 40h in the upper row have an inclination angle α1 with respect to the horizontal plane. The water injection holes 40h in the lower row have an inclination angle α2 with respect to the horizontal plane. In this specification, the inclination angle α of the water injection holes 40h means the average of the inclination angle α1 and the inclination angle α2.

[0046] Returning to FIG. 3 , a water tank 41 is installed above the spray pipes 40a, 40b, and 40c. The spray pipes 40a, 40b, and 40c are connected to a pipe 42 that hangs down from the water tank 41. A valve 43 is provided on the pipe 42. When the valve 43 is opened, water stored in the water tank 41 is supplied to each of the spray pipes 40a, 40b, and 40c through the pipe 42. The water supplied to each of the spray pipes 40a, 40b, and 40c is sprayed from the water injection holes 40h toward the red-hot coke C in the fire bucket 31. As a result, water is sprayed onto the red-hot coke C in the fire bucket 31 from obliquely above.

[0047] In this case, if the sprinkler pipes 40a, 40b, 40c are located at an appropriate distance in the height direction from the red-hot coke C, the water spray holes 40h will not be clogged even if the water sprayed from the sprinkler pipes 40a, 40b, 40c collides with the red-hot coke C, scattering fine-grained coke. In this case, if the spray flow rate density is high, the red-hot coke C accumulated in the ignition bucket 31 can be cooled uniformly in the depth direction. Furthermore, increasing the spray flow rate density is effective from the viewpoint of shortening the time required for extinguishing by water spraying. The spray flow rate density depends on the amount of coke to be treated at one time, but is preferably 0.5 (ton / min / m 2 ) or more. On the other hand, if the water spray flow rate density is too high, fine-grained coke will scatter violently, which may cause damage to the surrounding environment. For this reason, the water spray flow rate density should be no more than 1.5 (tons / min / m 2 ) or less is preferable.

[0048] Referring to the left column of FIG. 5, each of the sprinkler pipes 40a, 40b, and 40c is divided into a first end portion 401, a central portion 400, and a second end portion 402 along the furnace battery direction. In this embodiment, the first end portion 401, the central portion 400, and the second end portion 402 of each of the sprinkler pipes 40a, 40b, and 40c are independent and connected to each other by a loose flange 405. In this case, the first end portion 401 and the central portion 400 are rotatable about their respective axes by the loose flange 405. The second end portion 402 and the central portion 400 are rotatable about their respective axes by the loose flange 405. This allows the inclination angle α of the water injection holes 40h of the first end portion 401 to be adjusted to be different from the inclination angle α of the water injection holes 40h of the central portion 400. Similarly, the inclination angle α of the water injection holes 40h of the second end portion 402 can be adjusted to be different from the inclination angle α of the water injection holes 40h of the central portion 400.

[0049] In each of the sprinkler pipes 40a, 40b, 40c, the inclination angle α of the water injection holes 40h in the central portion 400 with respect to the horizontal plane is different from the inclination angle α of the water injection holes 40h in the first end portion 401 and the second end portion 402 with respect to the horizontal plane. In this embodiment, the inclination angle α of the water injection holes 40h in the central portion 400 is greater than the inclination angle α of the water injection holes 40h in the first end portion 401 and the second end portion 402.

[0050] In this case, in the right column of Fig. 5, the area where water sprayed from the water spray holes 40h of each sprinkler pipe 40a, 40b, 40c falls (sprinkler area) is shown as a hatched area surrounded by a two-dot chain line. Water sprayed from the water spray holes 40h in the center portion 400 of each sprinkler pipe 40a, 40b, 40c falls on the area of ​​the red-hot coke C in the fire bucket 31 that is closer to the sprinkler pipe 40a, 40b, 40c in the furnace length direction, i.e., the area on the opposite side to the coke oven. On the other hand, water sprayed from the water spray holes 40h in the first end portion 401 of each sprinkler pipe 40a, 40b, 40c falls on the area of ​​the red-hot coke C in the fire bucket 31 that is farther from the sprinkler pipe 40a, 40b, 40c in the furnace length direction, i.e., the area on the coke oven side. The water sprayed from the water injection holes 40h at the second end 402 of each sprinkler pipe 40a, 40b, 40c also falls into the area of ​​the red-hot coke C in the fire extinguishing bucket 31 on the coke oven side, similar to the water sprayed from the water injection holes 40h at the first end 401.

[0051] As described above, in the wet quenching method according to this embodiment, the moving step involves moving the fire bucket 31 containing the red-hot coke C to the position of the spray pipes 40a, 40b, and 40c. The process then moves to the extinguishing step. In the extinguishing step, water is sprayed from the water injection holes 40h of each of the spray pipes 40a, 40b, and 40c onto the red-hot coke C in the fire bucket 31 to extinguish the fire. In this extinguishing step, the fire bucket 31 is moved forward relative to each of the spray pipes 40a, 40b, and 40c in the direction of the furnace battery, and then moved backward after the forward movement.

[0052] In this embodiment, referring to FIG. 5, the fire extinguishing process includes a main fire extinguishing process, a first auxiliary fire extinguishing process, and a second auxiliary fire extinguishing process. In the main fire extinguishing process, water is sprayed from the water injection holes 40h while the center point of the fire bucket 31 in the direction toward the furnace battery is aligned with the center point of the central portion 400 of the water spray pipes 40a, 40b, and 40c. After a certain time has elapsed in the main fire extinguishing process, the process transitions to the first auxiliary fire extinguishing process. In the first auxiliary fire extinguishing process, the fire bucket 31 is moved forward toward the furnace battery from its position in the main fire extinguishing process. In this state, water is sprayed from the water injection holes 40h. After a certain time has elapsed in the first auxiliary fire extinguishing process, the process transitions to the second auxiliary fire extinguishing process. In the second auxiliary fire extinguishing process, the fire bucket 31 is moved backward toward the furnace battery from its position in the first auxiliary fire extinguishing process. In this state, water is sprayed from the water injection holes 40h.

[0053] Here, it is preferable to determine the amount of movement of the fire bucket 31 in the first and second sub-extinguishing processes as follows: The length of the central portion 400 of the spray pipes 40a, 40b, 40c in the direction of the furnace battery is L. In this case, in the first sub-extinguishing process, the fire bucket 31 is moved forward by a distance D that satisfies formula (1). In the second sub-extinguishing process, the fire bucket 31 is moved backward by a distance "2×D". L / 20≦D≦L / 2 (1)

[0054] This quenching process changes the amount of water sprayed on each region of the red-hot coke C according to the movement of the quenching bucket 31. As a result, the temperature of the coke after the water spraying is completed becomes roughly uniform over the entire region. Specifically, in the central region of the red-hot coke C in the quenching bucket 31, excluding both ends in the furnace battery direction, water is sprayed strongly on the region on the opposite side of the coke oven in the furnace length direction, and in the regions on one and the other ends in the furnace battery direction, water is sprayed strongly on the region on the coke oven side in the furnace length direction. Hereinafter, the region on one end will also be referred to as the front end region, and the region on the other end will also be referred to as the rear end region. In the right column of FIG. 5, the boundaries between the central region and both end regions (front end and rear end) of the red-hot coke C in the quenching bucket 31 are indicated by dashed lines.

[0055] More specifically, in the central region of the red-hot coke C in the fire bucket 31 in the direction of the furnace battery, the region on the opposite side of the coke oven is sprayed with water injected from the water injection holes 40h in the central portions 400 of the water spray pipes 40a, 40b, and 40c in the main quenching process. Furthermore, in the first sub-quenching process, as the fire bucket 31 moves forward, most of the region (rear end side) continues to be sprayed with water injected from the water injection holes 40h in the central portions 400 of the water spray pipes 40a, 40b, and 40c. Furthermore, in the second sub-quenching process, as the fire bucket 31 moves backward, most of the region (front end side) continues to be sprayed with water injected from the water injection holes 40h in the central portions 400 of the water spray pipes 40a, 40b, and 40c.

[0056] In the first sub-extinguishing process, the area of ​​the red-hot coke C in the fire bucket 31 on the coke oven side of the central area in the direction of the furnace battery is sprayed with water from the water injection holes 40h at the first ends 401 of the sprinkler pipes 40a, 40b, and 40c as the fire bucket 31 moves forward. Furthermore, in the second sub-extinguishing process, the area is sprayed with water from the water injection holes 40h at the second ends 402 of the sprinkler pipes 40a, 40b, and 40c as the fire bucket 31 moves backward.

[0057] The area of ​​the red-hot coke C in the fire bucket 31 on the coke oven side of the front end in the furnace battery direction is sprayed with water injected from the water injection holes 40h of the first ends 401 of the water spray pipes 40a, 40b, 40c. Furthermore, due to the first sub-extinguishing process, as the fire bucket 31 moves forward, most of this area continues to be sprayed with water injected from the water injection holes 40h of the first ends 401 of the water spray pipes 40a, 40b, 40c. Furthermore, due to the second sub-extinguishing process, as the fire bucket 31 moves backward, most of this area continues to be sprayed with water injected from the water injection holes 40h of the first ends 401.

[0058] In the region of the red-hot coke C in the quenching bucket 31 at the front end toward the oven battery, the region on the opposite side to the coke oven is sprayed with water from the water spray holes 40h in the center 400 of the spray pipes 40a, 40b, 40c as the quenching bucket 31 moves backward in the second auxiliary quenching process. Some of this region is not sprayed with water, and some of the red-hot coke is not directly sprayed with water, but the amount of this red-hot coke is small, and the water sprayed toward the coke oven in the region at the front end flows down, submerging the red-hot coke. Therefore, the red-hot coke is extinguished without being directly sprayed with water.

[0059] The area of ​​the red-hot coke C in the fire bucket 31 at the rear end in the furnace battery direction, which is on the coke oven side, is sprayed with water injected from the water injection holes 40h of the second ends 402 of the water spray pipes 40a, 40b, 40c. Furthermore, due to the first sub-extinguishing process, as the fire bucket 31 moves forward, most of this area continues to be sprayed with water injected from the water injection holes 40h of the second ends 402 of the water spray pipes 40a, 40b, 40c. Furthermore, due to the second sub-extinguishing process, as the fire bucket 31 moves backward, most of this area continues to be sprayed with water injected from the water injection holes 40h of the second ends 402.

[0060] In the area of ​​the red-hot coke C in the quenching bucket 31 at the rear end in the oven battery direction, on the side opposite the coke oven, most of that area is sprayed with water injected from the water injection holes 40h in the center 400 of the spray pipes 40a, 40b, 40c as the quenching bucket 31 moves forward in the first auxiliary quenching process. Some of that area is not sprayed with water, and some of the red-hot coke is not directly sprayed with water, but the amount of such red-hot coke is small, and the water sprayed on the coke oven side of the rear end area flows down, submerging the red-hot coke. Therefore, the red-hot coke is extinguished without being directly sprayed with water.

[0061] Therefore, the temperature of the coke after the water spraying is completed is substantially uniform over the entire area of ​​the red-hot coke C.

[0062] The reason why it is preferable to move the fire bucket 31 forward by the distance D that satisfies formula (1) in the first sub-extinguishing process and to move the fire bucket 31 backward by the distance "2×D" in the second sub-extinguishing process will be explained below. The water sprayed from the water spray holes 40h of the sprinkler pipes 40a, 40b, and 40c that falls on the coke oven side of the fire bucket 31 also diffuses toward the oven battery while flowing down the bottom plate 311 of the fire bucket 31, quenching and cooling the lower layer of the red-hot coke C. If the distance D is smaller than the lower limit "L / 20" defined in formula (1), the diffusion of water in the lower layer of the red-hot coke C toward the oven battery will be insufficient, and this portion will likely not be sufficiently extinguished. Furthermore, even if some of the numerous water injection holes 40h become clogged, if the distance D is "L / 20" or more, the portion of the red-hot coke C below the clogged water injection holes 40h will move relatively to the portion below the sound water injection holes 40h and be sufficiently extinguished. On the other hand, if the distance D is "L / 2", the retreating movement distance "2 × D" of the fire bucket 31 in the second secondary extinguishing step is L, so the entire area of ​​the red-hot coke C, especially the central area, can be sufficiently extinguished with the minimum movement distance. However, the distance D may exceed "L / 2".

[0063] [effect] The wet quenching method according to this embodiment performs wet quenching of the red-hot coke C through a series of steps: a pushing step, a moving step, and a quenching step. In the quenching step, water is sprayed from the water injection holes 40h of the multiple sprinkler pipes 40a, 40b, and 40c onto the red-hot coke C in the quenching bucket 31 to extinguish the quench. Here, each sprinkler pipe 40a, 40b, and 40c is installed outside the coke discharge kiln mouth 11a, between the furnace batteries 10, on the opposite side of the coke oven from the quenching bucket 31. Each sprinkler pipe 40a, 40b, and 40c extends toward the furnace battery and is spaced apart vertically. The water injection holes 40h of each sprinkler pipe 40a, 40b, and 40c are arranged in an area corresponding to the length of the quenching bucket 31 in the direction of the furnace battery and face diagonally downward. Furthermore, each sprinkler pipe 40a, 40b, 40c is divided into a first end portion 401, a central portion 400, and a second end portion 402 along the furnace bed direction, and the inclination angle α of the water injection hole 40h of the central portion 400 is different from the inclination angle α of the water injection hole 40h of each of the first end portion 401 and the second end portion 402.

[0064] In the wet quenching method according to this embodiment, the red-hot coke C pushed out of the coke chamber 11 in the pushing step is accommodated in the quenching bucket 31, and the moving step moves the quenching bucket 31 containing the red-hot coke C to the positions of the spray pipes 40a, 40b, and 40c. Then, in the quenching step, while wet quenching is performed by spraying water from the spray pipes 40a, 40b, and 40c onto the red-hot coke C in the quenching bucket 31, the quenching bucket 31 is moved forward toward the furnace battery relative to the spray pipes 40a, 40b, and 40c, and then moved backward after the forward movement. In this case, the amount of water sprayed on each region of the red-hot coke C changes in accordance with the movement of the quenching bucket 31, and thus the coke temperature after the water spraying is completed is generally uniform throughout the entire region. As a result, the red-hot coke C can be sufficiently extinguished without excessive water spraying throughout the entire region.

[0065] Furthermore, in the extinguishing process of this embodiment, in the first sub-extinguishing process, the extinguishing bucket 31 is moved forward by a distance D that satisfies formula (1), and in the second sub-extinguishing process, the extinguishing bucket 31 is moved backward by a distance "2 x D." In this case, in the extinguishing process, the extinguishing bucket 31 moves forward and backward by a minimum distance to sufficiently extinguish the red-hot coke C over the entire area and to make the coke temperature after water spraying is completed approximately uniform over the entire area. Therefore, by preventing excessive water spraying on the coke while ensuring sufficient extinguishing of the red-hot coke C, it is possible to produce coke with low moisture content without leaving any unextinguished areas. Furthermore, it is possible to minimize the fuel consumption of the fire truck 3. [Example]

[0066] The present disclosure will be described in more detail below with reference to examples, although the present disclosure is not limited to the following examples.

[0067] Tests were conducted using the coke oven 1 and its peripheral equipment shown in Figures 1 to 5. As shown in Figure 3, the width w (length in the furnace longitudinal direction) of the refueling bucket 31 was 5.0 m. The amount of red-hot coke C per run was 25 tons. The inclination angle θ of the bottom plate 311 of the refueling bucket 31 was 15°.

[0068] [Deposit of red-hot coke C in fire bucket 31] The layer height of the red-hot coke C in the fire bucket 31 was measured along the furnace length direction using a laser-type three-dimensional shape measurement device at two locations: the center in the furnace battery direction and one end in the furnace battery direction. Figure 6 shows an example of the pile state of the red-hot coke C contained in the fire bucket 31. In Figure 6, the horizontal axis represents the distance from the end of the fire bucket 31 opposite the coke oven in the furnace length direction, and the vertical axis represents the layer height of the red-hot coke C. Hereinafter, the distance from the end of the fire bucket 31 opposite the coke oven in the furnace length direction will also be referred to as the "width direction distance."

[0069] As shown in Figure 6, at the center of the fire bucket 31, the layer height of the red-hot coke C was about 900 mm at a widthwise distance of 2 to 3.5 m, which was higher than at other locations. On the other hand, the layer height at the ends of the fire bucket 31 was lower than at the center. Specifically, at a widthwise distance of 0 to 3.5 m, the layer height of the red-hot coke C was about 400 mm, and at a widthwise distance of 4.5 to 5.0 m, the layer height was almost zero. This shows that spraying water on the center is extremely important.

[0070] [Sprinkler pipes 40a, 40b, 40c] As shown in FIG. 3, the height hc of the lower sprinkler pipe 40c from the top of the fire bucket 31 was 5.0 m. The height hb of the middle sprinkler pipe 40b was 5.7 m. The height ha of the upper sprinkler pipe 40a was 6.4 m. The water injection holes 40h of the sprinkler pipes 40a, 40b, and 40c were arranged in two rows. The inclination angles α1 and α2 of the water injection holes 40h in each row were adjusted. Sprinkling of water from the sprinkler pipes 40a, 40b, and 40c was started by opening the valve 43. After the set time had elapsed, the valve 43 was closed to stop the water spraying. The length L of the central portion 400 of the sprinkler pipes 40a, 40b, and 40c was 8 m.

[0071] Pressure gauges were installed on the sprinkler pipes 40a, 40b, and 40c to measure the pressure during sprinkler operation. The pressure of the lower sprinkler pipe 40c was the highest at 27.6 kPa. The pressure of the middle sprinkler pipe 40b was 23.6 kPa. The pressure of the upper sprinkler pipe 40a was 16.2 kPa. Therefore, it can be said that the lower sprinkler pipe 40c sprayed the most water and had the greatest impact on fire extinguishing.

[0072] After the quenching of the red-hot coke C was completed, the quenching bucket 31 was moved to the wharf 5, and the quenched coke was discharged to the wharf 5. The temperature of the coke being discharged to the wharf 5 was continuously measured using an infrared thermoviewer. At the wharf, the coke was subjected to a 10-minute dry air cooling treatment and then placed on a belt conveyor to the blast furnace. The dry air cooling time was measured from immediately after the wet-quenched coke was discharged to the wharf until the coke began to be discharged onto the belt conveyor. A sample was then taken from the coke CA immediately after it was placed on the belt conveyor, and its moisture content was measured. Specifically, 30–40 kg (wet basis) of coke was sampled as the sample. The sample was weighed. The sample was dried at 150°C for 4 hours. The weight of the dried sample was then measured. The moisture content was then calculated by dividing the weight of the sample before drying by the weight of the sample before drying.

[0073] The test was carried out under three conditions: Comparative Example 1, Comparative Example 2, and an example of the present invention. The results are summarized in Table 1.

[0074] [Table 1]

[0075] <Comparative Example 1: No movement of the fire bucket 31 during wet fire extinguishing> In Comparative Example 1, the inclination angles α1 and α2 of the water injection holes 40h in the fire bucket 31 were adjusted so that water was mainly sprayed onto the region (2 to 3.5 m) where the layer height of the red-hot coke C was large. The respective inclination angles α1 and α2 are as shown in Table 1.

[0076] In Comparative Example 1, the center, first end, and second end of the sprinkler pipe all had the same inclination angle. Therefore, the sprinkler trajectory was also the same. The lower sprinkler pipe 40c, which had the largest amount of water and the greatest impact, aimed to spray water at positions 2.0 m and 3.5 m away from the width. The middle sprinkler pipe 40b, which had the second largest amount of water after the lower sprinkler pipe 40c, aimed to spray water at a position 2.5 m away from the width. For extinguishing the red-hot coke at a width distance of 0 to 2 m, the aim was to submerge the inside of the fire bucket 31 in the flowing water. While the sprinkler pipes 40a, 40b, and 40c were spraying water, the fire bucket 31 was kept stationary without moving. The total spraying time was 80 seconds, and the total amount of water sprayed was 80 tons.

[0077] As shown in Table 1, the maximum temperature of the coke discharged onto the wharf exceeded 500°C, the maximum measurement range of the infrared thermoviewer used. Coke that exceeds 500°C remains red-hot and is problematic from a disaster prevention perspective. This type of coke was detected in the central area of ​​the fire bucket 31 early in the discharge onto the wharf. Since the detection occurred early, it is believed that the coke located at a widthwise distance of 0 to 2.0 m in the fire bucket 31 was hot enough to remain red-hot.

[0078] Transporting hot coke on a conveyor belt raises the risk of fire. Therefore, at the wharf, water was sprayed individually onto high-temperature coke exceeding 350°C, including red-hot coke. Because high-temperature coke is initially discharged to the wharf, it is located in the lower layer of coke after being discharged. In this case, low-temperature coke is overlaid on the high-temperature coke. Therefore, when water was sprayed individually at the wharf, it also sprayed on the low-temperature coke. Furthermore, even when water was sprayed at the wharf, only a small amount of water reached the high-temperature coke in the lower layer, preventing efficient fire extinguishing. Naturally, the low-temperature coke absorbed the sprayed water, increasing its moisture content. As a result, the moisture content of the coke was greater than 10% by mass.

[0079] <Comparative Example 2: No movement of the fire bucket 31 during wet fire extinguishing> In Comparative Example 2, the inclination angle of the water injection holes in the center of the sprinkler pipe was made more downward than in Comparative Example 1. The inclination angles of the water injection holes at the first end and the second end were left the same as in Comparative Example 1. In Comparative Example 1, it was thought that the temperature was high in the central region of the fire bucket 31 at a widthwise distance of 0 to 2 m, and that a large amount of coke remained in a red-hot state. Therefore, in Comparative Example 2, the range of water sprayed from the center of the sprinkler pipe was changed. That is, the target of water spray from the center of the lower sprinkler pipe 40c was changed from a position at a widthwise distance of 2 to 3.5 m to a position at a widthwise distance of 0 to 2.0 m.

[0080] However, the amount of water sprayed by the lower sprinkler pipe 40c, which had the greatest amount of water sprayed, was significantly reduced at width distances of 2 to 3.5 m because the water spray was directed downward at width distances of 0 to 2 m. The inclination angles α1 and α2 are as shown in Table 1.

[0081] The water spray from the lower sprinkler pipe 40c, which has the largest amount of water sprayed and the greatest impact, was aimed at positions at a widthwise distance of 0.5 m and 2.0 m in the central region of the fire bucket 31. Water was sprayed from the middle sprinkler pipe 40b and the upper sprinkler pipe 40a to positions in the central region of the fire bucket 31 where the layer height of the red-hot coke C was large (positions at a widthwise distance of 2.0 to 3.5 m). While water was being sprayed from the sprinkler pipes 40a, 40b, and 40c, the fire bucket 31 was kept stationary without moving. The total water spraying time was 80 seconds, and the total amount of water sprayed was 80 tons.

[0082] As shown in Table 1, the maximum temperature of the coke discharged onto the wharf exceeded 500°C, the maximum measurement range of the infrared thermoviewer used. Coke exceeding 500°C remains red-hot and is problematic from a disaster prevention perspective. This coke was detected in the central area of ​​the fire bucket 31 midway through the wharf discharge. Since it was detected midway, it is estimated that the coke located in the fire bucket 31 at a widthwise distance of approximately 2.0 to 3.5 m was hot and remained red-hot.

[0083] If hot coke is transported on a conveyor belt, there is a risk of fire. Therefore, in the wharf, water was sprayed individually on coke with a temperature exceeding 350°C, including red-hot coke. Because the high-temperature coke is discharged to the wharf at a mid-term timing, it is located in the upper layer of coke after being discharged to the wharf. Therefore, when spraying water individually on the wharf, red-hot coke was more easily extinguished than in Comparative Example 1. However, the temperature of the coke sprayed individually on the wharf was lower than that immediately after it was pushed out of the coke chamber. Therefore, much of the sprayed water was absorbed into the coke, increasing the moisture content of the coke. As a result, it was not possible to reduce the moisture content of the coke to 5% by mass or less.

[0084] <Example of the present invention: Fire-fighting bucket 31 moves during wet fire-fighting> In the present invention example, the inclination angle of the water injection holes of each sprinkler pipe was the same as in Comparative Example 2. However, the fire bucket 31 was moved during water sprinkler fire extinguishing. That is, after the main fire extinguishing process, the fire bucket 31 was moved forward in the first auxiliary fire extinguishing process, and then the fire bucket 31 was moved backward in the second auxiliary fire extinguishing process. Specifically, after holding the main fire extinguishing process for 10 seconds, the process shifted to the first auxiliary fire extinguishing process, in which the fire bucket 31 was moved forward 4 m. The forward movement took 7 seconds. The fire bucket 31 was then stopped for 25 seconds. The process then shifted to the second auxiliary fire extinguishing process, in which the fire bucket 31 was moved backward 8 m. The backward movement took 13 seconds. The fire bucket 31 was then stopped for 25 seconds. After that, water sprinkling was stopped. The total water sprinkling time was 80 seconds, and the total water sprinkling amount was 80 tons.

[0085] In the first 10 seconds of the main fire extinguishing process, water is sprayed from the central water spray holes of the lower sprinkler pipe, which has a large water spray rate, onto the coke located in the central region of the fire bucket 31 and at a widthwise distance of 0 to 2.0 m. In other words, water spraying is strengthened in areas where water spraying was insufficient in Comparative Example 1.

[0086] Furthermore, the first auxiliary extinguishing process causes the fire bucket 31 to move forward as shown in FIG. 5. As a result, the area near the front end of the center of the fire bucket 31 moves below the first end 401 of the sprinkler pipe. The amount of water sprayed from the lower sprinkler pipe 40c is also the largest at the first end 401, and the impact is significant. Water sprayed from the water spray holes 40h of this sprinkler pipe 40c falls at a position 2.0 to 3.5 m away in the width direction. That is, in Comparative Example 2, water is sprayed from the lower sprinkler pipe 40c, which is assumed to spray the largest amount of water, to the location where red-hot coke is estimated to remain. Furthermore, water sprayed from the central water spray holes of the lower sprinkler pipe falls on the coke at a width direction distance of 0 to 2.0 m in the area near the rear end of the center of the fire bucket 31 and the area near the center of the rear end. In this case, water is not sprayed onto a part of the area (front end side) of the front end of the fire bucket 31, but since the amount of coke accumulated in that area is small, water is not insufficient. Conversely, excessive water spraying onto that area can be prevented.

[0087] Furthermore, the second auxiliary extinguishing process causes the fire bucket 31 to move backward as shown in FIG. 5. As a result, the area near the rear end of the center of the fire bucket 31 moves below the second end 402 of the sprinkler pipe. The amount of water sprayed from the lower sprinkler pipe 40c is also the largest at the second end 402, and the impact is significant. Water sprayed from the water spray holes 40h of this sprinkler pipe 40c falls at a position 2.0 to 3.5 m away in the width direction. That is, in Comparative Example 2, water is sprayed from the lower sprinkler pipe 40c, which is assumed to spray the largest amount of water, to the location where red-hot coke is estimated to remain. Furthermore, water sprayed from the central water spray holes of the lower sprinkler pipe falls on the coke at a width direction distance of 0 to 2.0 m in the area near the front end of the center of the fire bucket 31 and the center of the front end. In this case, water is not sprayed onto a part of the area (rear end side) of the rear end of the fire bucket 31, but since the amount of coke accumulated in that area is small, water is not insufficient. Conversely, excessive water spraying onto that area can be prevented.

[0088] As a result of this water spraying, no coke remained red-hot when it was discharged to the wharf, and the coke confirmed at the time of discharge to the wharf had a minimum temperature of 61°C and a maximum temperature of 383°C. As a result, the coke temperature was within the target range of 60°C to 400°C. No remaining red-hot coke was confirmed. The moisture content of the coke was 4.4% by mass, exceeding the target of 5% by mass.

[0089] Although the embodiments of the present disclosure have been described above, the present disclosure is not limited to the above embodiments, and various modifications are possible without departing from the spirit of the present disclosure. For example, in each of the sprinkler pipes 40a, 40b, and 40c, the inclination angle α of the water injection holes 40h in the central portion 400 may be smaller than the inclination angle α of the water injection holes 40h at the first end 401 and the second end 402. Furthermore, in the fire extinguishing process, the fire bucket is moved forward toward the furnace battery and then moved backward, but it may be moved forward in either of the two directions toward the furnace battery. [Explanation of symbols]

[0090] 1: Coke oven 10: Furnace 11: Carbonization chamber 11a: Coke discharge port 12: Combustion chamber 3: Fire truck 31: Fire bucket 40a, 40b, 40c: Sprinkler pipes 40h: Water injection hole α, α1, α2: Inclination angle 400: Central part 401: First end 402:Second end C: Red-hot coke

Claims

1. A method for wet quenching of red-hot coke, in which red-hot coke produced in a coke oven is quenched by a wet quenching device, comprising: The coke oven includes a furnace battery arranged in one direction, the furnace battery including combustion chambers arranged in the one direction and carbonization chambers arranged between the combustion chambers; The wet fire extinguishing device is a fire extinguishing bucket configured to be movable in the arrangement direction of the furnace battery outside the coke discharge kiln port of the carbonization chamber; a plurality of sprinkler pipes provided between the furnace battalions outside the coke discharge kiln port on the opposite side of the coke discharge kiln port with respect to the fire extinguishing bucket, each of the sprinkler pipes extending in the arrangement direction of the furnace battalions and spaced apart from one another in the up-down direction, Each of the plurality of sprinkler pipes has a water injection hole facing diagonally downward and arranged in an area corresponding to the length of the fire extinguishing bucket in the arrangement direction of the furnace battery, and is divided into a first end, a central portion, and a second end along the arrangement direction of the furnace battery, In each of the plurality of sprinkler pipes, an inclination angle of the water injection hole in the central portion with respect to a horizontal plane is different from an inclination angle of the water injection hole in each of the first end portion and the second end portion with respect to the horizontal plane, The wet fire extinguishing method comprises: an extrusion step of extruding the red-hot coke from the coke discharge port of the carbonization chamber and storing it in the quenching bucket; a moving step of moving the fire bucket containing the red-hot coke to a position of the plurality of spray pipes; a fire extinguishing step of spraying water from the water spray holes of the plurality of water spray pipes onto the red-hot coke in the fire extinguishing bucket to extinguish the fire, In the extinguishing process, the extinguishing bucket is moved forward relative to the plurality of spray pipes in the arrangement direction of the furnace battery, and then moved backward after the forward movement.

2. The wet fire extinguishing method according to claim 1, a water spray pipe for spraying water from the nozzles of the central portion of the nozzles to the nozzles of the first end portion and the second end portion of the nozzles to the nozzles of the second end portion of the nozzles;

3. The wet fire extinguishing method according to claim 1, A method for wet quenching of red-hot coke, wherein the number of the plurality of spray pipes is three.

4. The wet fire extinguishing method according to any one of claims 1 to 3, When the length of the central portion of the sprinkler pipe in the arrangement direction of the furnace battery is L, The fire extinguishing step includes: a main fire extinguishing process in which the water is sprayed from the water spray holes while the center point of the fire extinguishing bucket coincides with the center point of the central part of the water spray pipe in the arrangement direction of the furnace battery; a first sub-extinguishing process in which the fire bucket is moved forward from the position in the main extinguishing process by a distance D satisfying formula (1) in the direction of arrangement of the furnace battery, and the water is sprayed from the water injection hole; a second sub-extinguishing process in which the water is injected from the water injection holes while the extinguishing bucket is moved back a distance of 2 x D from its position in the first sub-extinguishing process in the direction of the arrangement of the furnace battery. L / 20≦D≦L / 2 (1)

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