Coal loading hopper, coal loading vehicle, method of calculating bulk density, and method of manufacturing coke

Abstract

To provide a coal loading hopper capable of easily grasping a bulk density of coal for each batch of coal loaded into a coke oven chamber.SOLUTION: A coal loading hopper has: a bottomed cylindrical accommodation container for accommodating coal loaded into a coke oven chamber; a feeder for conveying coal accommodated in the accommodation container to the outside: a load cell for measuring a weight of coal loaded into the accommodation container; and a sensor for detecting a loading height of coal loaded into the accommodation container.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a coal charging hopper for charging coal into a coke oven chamber, a coal charging car, a bulk density calculation method, and a coke manufacturing method. [Background technology]

[0002] Chamber-hearth coke ovens (hereafter referred to as "coke ovens") are used to produce coke for use in blast furnaces. A coke oven consists of combustion chambers spaced apart in the width direction of the oven and a carbonization chamber sandwiched between the combustion chambers. The ceiling of the carbonization chamber of this coke oven is provided with a row of multiple (usually 4 to 5) holes for charging. Coal, the raw material for coke, is charged into the carbonization chamber through the holes, and the heat generated by burning gas in the combustion chamber is supplied to the carbonization chamber via refractories to carbonize the coal and produce coke.

[0003] Coal is loaded into the coke oven chamber by moving a coal loading car and loading the coal through a loading hole. In this process, it is desirable to load as much coal as possible into the coke oven chamber to improve coke productivity. Patent Document 1 discloses a coke oven coal loading level measuring device that measures the loading level by transmitting millimeter waves or microwaves to the coal loaded in the coke oven chamber and receiving the millimeter waves or microwaves reflected by the surface of the coal. Patent Document 1 states that by loading coal into the coke oven chamber while measuring the loading height, it is possible to load coal up to a target loading height. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 2019-104922 Summary of the Invention [Problem to be solved by the invention]

[0005] The inside of a coke chamber where coal is charged is a harsh environment with high temperatures and a large amount of dust flying around. Therefore, even if millimeter waves or microwaves are transmitted to an area where the amount of coal charged is small and the coal does not fall, the millimeter waves or microwaves are blocked by the large amount of dust, making it difficult to accurately measure the coal charging level. Furthermore, even if the coal charging level could be measured, feedback control is used to determine the amount of coal charged based on the measured coal charging level, which increases the time it takes to charge coal into the coke chamber and reduces the productivity of the coke oven.

[0006] Since the volume of the coke chamber can be determined in advance, if the bulk density of the coal to be charged in the coke chamber can be determined, the loading level of the coke chamber can be determined. However, the bulk density of coal is affected by the particle size and moisture content of the coal, and therefore fluctuates daily. Measuring the particle size and moisture content of coal takes a long time, so if the particle size and moisture content of coal are measured for each coal charged in the coke chamber, the loading time will be longer, which is a problem as it reduces the productivity of the coke oven.

[0007] The present invention has been made in consideration of the problems of the prior art, and its object is to provide a coal charging hopper that can easily grasp the bulk density of each coal charged in a coke chamber. Another object of the present invention is to provide a coal charging car having two or more such coal charging hoppers, a bulk density calculation method for calculating the bulk density of coal charged in the coal charging hoppers, and a coke manufacturing method. [Means for solving the problem]

[0008] The means for solving the above problems are as follows. [1] A coal loading hopper having a bottomed cylindrical storage container for storing coal to be loaded into the carbonization chamber of a coke oven, a feeder for transporting the coal stored in the storage container to the outside, a load cell for measuring the weight of the coal loaded into the storage container, and a sensor for detecting the loading height of the coal loaded into the storage container. [2] A coal loading hopper as described in [1], which has two or more sensors, and the two or more sensors are installed at two or more different positions in the height direction within the storage container. [3] A coal loading hopper according to [1] or [2], wherein the sensor is a limit switch that detects the presence of coal within a predetermined range. [4] A coal loading hopper as described in [3], wherein the limit switch is positioned so that the measuring part of the limit switch faces downward and is positioned at a distance of 10 mm or more and 50 mm or less from the side of the storage container. [5] A coal loading hopper as described in [3] or [4], wherein the limit switch is a capacitance type limit switch and the measuring part of the limit switch is coated with a fluororesin. [6] A coal loading car comprising a coal loading hopper described in any one of [1] to [5], a calculation device that calculates the bulk density of the coal loaded into the storage container, and a moving means, wherein the calculation device comprises a weight determination unit that determines the weight of the load cell when the sensor detects the loading height of the coal, and a bulk density calculation unit that calculates the cold bulk density of the coal loaded into the storage container using the weight determined by the weight determination unit. [7] The coal loading car described in [6], wherein the calculation device further has a bulk density correction unit that corrects the cold bulk density to a hot bulk density. [8] A bulk density calculation method for calculating the bulk density of coal loaded into a coal loading hopper having a storage container for storing coal, the method comprising: a coal loading step for loading coal into the storage container; a weight determination step for determining the weight of the coal when the loading height of the coal loaded into the storage container reaches a predetermined height; and a bulk density calculation step for calculating the cold bulk density of the coal loaded into the storage container using the weight. [9] The bulk density calculation method according to [8], further comprising a bulk density correction step of correcting the cold bulk density calculated in the bulk density calculation step to a hot bulk density.

[10] A method for producing coke, comprising: a coal charging step in which the hot bulk density calculated by the bulk density calculation method described in [9] is used to determine the amount of coal to be charged from the coal charging hopper to a carbonization chamber of a coke oven, and the determined amount of coal is charged to the coke oven; and a coal carbonization step in which the coal charged in the carbonization chamber is carbonized. [Effects of the Invention]

[0009] By using the coal charging hopper according to the present invention, it is possible to measure the weight and charging height of each piece of coal charged into the coke chamber. The volume of the coal charged into the coal charging hopper can be determined from the charging height of the coal, and the bulk density can be calculated using the volume and weight, making it easy to grasp the bulk density of each piece of coal charged into the coke chamber. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional schematic view showing an example of a coal charging hopper according to this embodiment. [Figure 2] FIG. 2 is a cross-sectional schematic diagram of a coal loading car according to this embodiment. [Figure 3] FIG. 3 is a schematic diagram showing an example of the configuration of the arithmetic device. [Figure 4] FIG. 4 is a flow chart showing an example of a bulk density calculation method and a coke production method according to this embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0011] The present invention will be specifically described below through embodiments of the present invention. The following embodiments are preferred examples of the present invention, and the present invention is not limited to these embodiments.

[0012] FIG. 1 is a cross-sectional schematic diagram showing an example of a coal loading hopper 10 according to this embodiment. The coal loading hopper 10 includes a storage container 12, a feeder 14, a grate 16, a chute 32, a load cell 30, a fixture 20, and two sensors 28 and 29. The storage container 12 is a cylindrical container with a bottom that stores coal to be loaded into the carbonization chamber of a coke oven. The storage container 12 includes a body 18 with parallel sides and a sloped portion 19 located below the body 18 and tapering downward. The feeder 14 is located at the bottom of the storage container 12 and transports the coal stored in the storage container 12 to the chute 32.

[0013] The chute 32 is a cylindrical member that guides the coal transported to the outside by the feeder 14 to a coal charging hole provided in the ceiling of the carbonization chamber. The grate 16 is a metal net provided at the upper end of the storage vessel 12. The grate 16 is provided to prevent foreign matter other than coal from being charged into the storage vessel 12. Therefore, the openings of the grate 16 are set to a size that allows the charged coal to pass through but prevents foreign matter from passing through.

[0014] The load cell 30 is provided at the upper end of the storage vessel 12 and measures the weight of the storage vessel 12, the feeder 14, and the coal charged into the storage vessel 12. The load cell 30 is also installed at the lower end of a support member 40 on the coal charging car side. Since the weight is measured by the load cell 30, the feeder 14 and the chute 32 are provided separately so as not to come into contact with each other.

[0015] The fixing jig 20 is a jig that fixes two sensors 28, 29, which detect the charging height of coal charged into the storage vessel 12, inside the storage vessel 12. The fixing jig 20 has a shaft portion 22, two fixing portions 24, and a locking portion 26. The locking portion 26 is provided at one end of the shaft portion 22. The locking portion 26 is locked with the grate 16, thereby fixing the fixing jig 20 so that the longitudinal direction of the shaft portion 22 is parallel to the height direction of the storage vessel 12. The locking portion 26 may be fixed to the grate 16 with a bolt instead of or in addition to the locking.

[0016] The two fixing portions 24 are provided at two different positions in the longitudinal direction of the shaft portion 22. One of the two fixing portions 24 may be provided at the other end of the shaft portion 22. The two fixing portions 24 are, for example, triangular prism-shaped members with a cross section of a right triangle, and are fixed to the shaft portion 22 with their slant surfaces facing downward and toward the wall surface of the storage container 12. A recess that opens downward is formed in each slant surface of the two fixing portions 24, and two sensors 28, 29 are respectively provided in the recesses.

[0017] The two sensors 28, 29 are mounted in the recesses of the two fixing parts 24 with their measuring parts facing downward, and detect the charging height of the coal. In this way, the two sensors 28, 29 are preferably mounted with their measuring parts facing downward. This allows the position of coal rising from below to be detected with high accuracy. Furthermore, damage to the measuring parts due to collisions with coal being charged from above can also be prevented.

[0018] The two sensors 28, 29 are preferably provided on the wall surface and the downward-facing slope of the fixing part 24. This prevents the two sensors 28, 29 from colliding with coal charged from above, and suppresses damage to the two sensors 28, 29.

[0019] The two sensors 28, 29 are preferably provided in the trunk 18 where the side surfaces of the storage vessel 12 are parallel. By providing the two sensors 28, 29 in the trunk 18 of the storage vessel 12, it becomes possible to estimate with higher accuracy the volume V of coal contained in the range from height h2 to height h1 where the sensors are provided.

[0020] The two sensors 28, 29 are, for example, limit switches that detect the presence of coal within a predetermined range. Limit switches come in three types: capacitance, paddle, and vibration. It is preferable to use a capacitance limit switch. Paddle limit switches are not preferred because the paddle blades may come into contact with coal and bend. Vibration limit switches are also not preferred because they take approximately 3 to 5 seconds to detect the coal pile surface, resulting in a slow response speed and low detection accuracy.

[0021] When the two sensors 28, 29 are capacitance-type limit switches, the measuring part of the limit switch is preferably covered with a fluororesin, which prevents coal powder from adhering to the measuring part of the limit switch and prevents a decrease in the measuring sensitivity of the measuring part.

[0022] If the two sensors 28, 29 are capacitance-type limit switches with a sensing distance of 10 mm and a response speed of 0 seconds, these sensors are preferably provided in the body 18 of the storage vessel 12 at a distance of 10 mm to 50 mm from the side surface. By providing the two sensors 28, 29 at a distance of 10 mm or more from the side surface of the storage vessel 12, false detections due to the side surface of the storage vessel 12 or the coal that falls after being charged can be suppressed. Furthermore, the inner diameter of the storage vessel 12 of the coal loading hopper 10 is generally about 1750 mm. Therefore, by providing the two sensors 28, 29 at a distance of 50 mm or less from the side surface of the storage vessel, it is possible to avoid collisions between the two sensors 28, 29 and the coal being charged in the center of the storage vessel 12.

[0023] In this embodiment, sensor 28 is provided, for example, on the body 18 of the storage vessel 12, at a position where the height h1 from the bottom is 3046 mm. Sensor 29 is provided at a position where the height h2 from the bottom is 2546 mm. In this way, two sensors 28, 29 and a load cell 30 are provided to detect the weight W2 of the coal when the charging height of the coal reaches the height h2 of the sensor 29, and the weight W1 of the coal when the charging height of the coal reaches the height h1 of the sensor 28. Since the volume V of the coal included in the range from the height h2 to the height h1 can be calculated in advance, the bulk density of the coal charged into the storage vessel 12 can be calculated using the following equation (1).

[0024] Coal bulk density (kg / m 3 )=(W1-W2) / V (1) In the above formula (1), W1 is the weight (kg) of the load cell 30 when it reaches height h1, W2 is the weight (kg) when it reaches height h2, and V is the volume (m) of coal contained in the range from height h2 to height h1. 3 )

[0025] It is preferable that the difference between the height h1 of the sensor 28 and the height h2 of the sensor 29 be 500 mm or more. This reduces the proportion of error in the volume V, making it possible to determine the volume V of the coal contained in the range from height h2 to height h1 with high accuracy.

[0026] In this way, by using the coal charging hopper 10 according to this embodiment, it is possible to easily determine the bulk density of the coal charged into the coal charging hopper 10. The storage container 12 of the coal charging hopper 10 stores about 8 tons of coal, of which 6 to 7 tons is charged into the coke chamber. Therefore, if the bulk density of each coal charged into the coal charging hopper 10 can be determined, it becomes possible to easily determine the bulk density of each coal charged into the coke oven coke chamber.

[0027] The bulk density of the coal charged into the coal charging hopper 10 is the cold bulk density. On the other hand, the carbonization chamber of a coke oven is always heated to 1000°C or higher, and at that temperature the coal expands and increases in volume, resulting in a low bulk density. For this reason, it is preferable to use a hot bulk density that simulates the carbonization chamber, rather than the cold bulk density, as the bulk density used to calculate the amount of coal to be charged into the carbonization chamber.

[0028] The cold bulk density and hot bulk density of coal in the same state are determined by experiment, and a correction formula is determined by dividing the hot bulk density by the cold bulk density.The cold bulk density determined by the above procedure can then be corrected to the hot bulk density by multiplying the correction formula by the cold bulk density.

[0029] In this embodiment, an example of the coal loading hopper 10 having two sensors 28, 29 has been shown, but the number of sensors in the coal loading hopper 10 is not limited to this, and the coal loading hopper 10 may have only one sensor. If the coal loading hopper 10 has one sensor, the bulk density of the coal can be easily calculated by using the volume of the coal up to the charging height where the sensor is installed and the weight of the coal when the charging height is reached.

[0030] However, some of the coal previously charged in the coke chamber remains at the bottom of the storage vessel 12, and the bulk density calculated using one sensor includes the remaining coal. As described above, the bulk density of coal fluctuates daily depending on the particle size and moisture content of the coal, so the bulk density of the remaining coal may differ from the bulk density of newly charged coal. Therefore, if the volume and weight of the coal including the remaining coal are used to calculate the bulk density of the charged coal, the calculation accuracy of the coal bulk density decreases. Therefore, the calculation accuracy of the coal bulk density calculated from the volume and weight of coal obtained from one sensor is lower than the calculation accuracy of the coal bulk density calculated using the coal charging hopper 10 according to this embodiment.

[0031] For these reasons, it is preferable that the coal loading hopper 10 has two sensors 28, 29, and calculates the bulk density of the coal using the volume and weight of the coal contained between the heights at which the two sensors are installed. This makes it possible to calculate the bulk density of the charged coal with higher accuracy. Note that the coal loading hopper 10 may have two or more sensors, and in this case, the two or more sensors are installed at two or more different positions in the height direction within the storage vessel 12.

[0032] In the coal loading hopper 10 according to this embodiment, an example has been shown in which the grate 16, the fixing jig 20, and the chute 32 are provided, but these are not essential components, and the grate 16, the fixing jig 20, and the chute 32 do not have to be provided. If the grate 16 is not provided, the fixing jig 20 is fixed to the wall surface at the top end of the storage vessel 12. Also, if the fixing jig 20 is not provided, the two sensors 28, 29 are fixed to the inner wall surface of the storage vessel 12. If the chute 32 is not provided, the coal transported by the feeder 14 is loaded into the carbonization chamber of the coke oven through the coal loading hole.

[0033] Next, the coal loading car according to this embodiment will be described. Figure 2 is a cross-sectional schematic diagram of the coal loading car 70 according to this embodiment. The coal loading car 70 according to this embodiment has the coal loading hopper 10 shown in Figure 1, a calculation device 50 that calculates the bulk density of coal, and a moving means 72. The number of coal loading hoppers 10 that the coal loading car has is preferably determined according to the number of coal loading holes provided in the coke oven coke chamber. The coke chamber 82 used to explain this embodiment has five coal loading holes 84 in its ceiling, so the coal loading car 70 according to this embodiment will also be described using an example having five coal loading hoppers 10.

[0034] The coal loading car 70, with coal loaded into each of the coal loading hoppers 10, is moved by a moving means 72 on a rail 86 provided on the roof of the coke oven 80. The moving means 72 is, for example, a wheel with an electric drive unit. The coal loading car 70 moves to a position where the position of a coal loading hole 84 provided in the ceiling of the coking chamber 82 coincides with the position of the chute 32. When the position of the coal loading hole 84 coincides with the position of the chute 32, the coal in the storage vessel 12 is transported to the chute 32 by the feeder 14, and the coal is loaded into the coking chamber 82 through the chute 32. When the loading of coal into the coking chamber 82 is completed, the coal loading car 70 moves to a position where a coal feeding device for supplying coal is provided, and the coal is loaded into each of the coal loading hoppers 10.

[0035] The calculation device 50 is connected to each coal loading hopper 10 by wire or wirelessly. The calculation device 50 determines the weight of the load cell 30 when the charging height of the coal loaded in each coal loading hopper 10 reaches the height of the two sensors 28, 29, and uses this weight to calculate the cold bulk density of the loaded coal. The calculation device 50 corrects the calculated cold bulk density to a hot bulk density and uses this hot bulk density to determine the weight of coal to be loaded into the coke chamber 82. The calculation device 50 controls the operation of the feeder 14 so that the determined weight of coal is loaded into the coke chamber 82.

[0036] As described above, it is preferable to load as much coal as possible into the coke chamber 82 to improve the productivity of the coke oven. On the other hand, if too much coal is loaded into the coke chamber 82, the coal loading holes 84 will become clogged, and since it takes time to unblock the blockage, the productivity of the coke oven will actually decrease. For this reason, the coal loading car 70 is required to load the target volume of coal into the coke chamber 82 through each coal loading hole 84.

[0037] The target volume of coal to be charged into the coking chamber 82 is determined in advance by conducting a coal charging test into the coking chamber 82. Therefore, the calculation device 50 grasps the bulk density of the coal stored in the coal charging hopper 10 and specifies the coal weight that will result in the target volume from the bulk density. The calculation device 50 transports coal of the specified coal weight from the feeder 14 to the chute 32 while monitoring the load cell 30. This makes it possible to charge the target volume of coal into the coking chamber 82 from each coal charging hole 84.

[0038] Next, the arithmetic device 50 will be described. Fig. 3 is a schematic diagram showing an example of the configuration of the arithmetic device 50. The arithmetic device 50 is, for example, a general-purpose computer such as a workstation or a personal computer. The arithmetic device 50 has a control unit 52, an input unit 54, an output unit 56, and a storage unit 58. The control unit 52 is, for example, a CPU, and functions as a weight specifying unit 60, a bulk density calculating unit 62, and a bulk density correcting unit 64 by executing a program stored in the storage unit 58.

[0039] The input unit 54 is, for example, a keyboard, a touch panel integrated with a display, or the like. The output unit 56 is, for example, an LCD or CRT display, or the like. The storage unit 58 is, for example, an updatable flash memory, a built-in hard disk or a hard disk connected via a data communication terminal, an information recording medium such as a memory card, and a read / write device for the same. The storage unit 58 stores programs and data for realizing each function of the arithmetic device 50. Specifically, the storage unit 58 stores the above formula (1) for calculating bulk density, the volume V of coal included in the range from height h2 to height h1, a correction formula for correcting cold bulk density to hot bulk density, the target volume of coal to be charged in the coke chamber, and the like. These data are obtained in advance by an operator and stored in the storage unit 58 by the operator via the input unit 54.

[0040] Next, the processes executed by the weight specifying unit 60, bulk density calculation unit 62, and bulk density correction unit 64 will be described. The weight specifying unit 60 acquires weight data from the load cell 30 of each coal loading hopper 10, for example, every 0.1 seconds. The weight specifying unit 60 waits for a detection signal indicating that coal has been detected to be output from the sensors 28, 29, and specifies the load cell weights W1 (corresponding to the charging height: h1) and W2 (corresponding to the charging height h2) at the time the signal is output. The weight specifying unit 60 outputs the specified weights W1 and W2 to the bulk density calculation unit 62.

[0041] When the bulk density calculation unit 62 acquires the weights W1 and W2 from the weight identification unit 60, it reads out the above formula (1) and the volume V of the coal included in the range from h2 to height h1 from the storage unit 58. The bulk density calculation unit 62 calculates the cold bulk density of the coal charged into the coal charging hopper 10 using the above formula (1), the volume V, and the weights W1 and W2. The bulk density calculation unit 62 may also cause the output unit 56 to display the cold bulk density.

[0042] The bulk density calculation unit 62 outputs the calculated cold bulk density to the bulk density correction unit 64. When the bulk density correction unit 64 acquires the cold bulk density from the bulk density calculation unit 62, it reads out a correction formula for correcting the cold bulk density to a hot bulk density from the storage unit 58. The bulk density correction unit 64 corrects the cold bulk density acquired from the bulk density calculation unit 62 to a hot bulk density using the correction formula. The bulk density correction unit 64 outputs the hot bulk density to the feeder operation unit 66. Note that the bulk density correction unit 64 may also cause the output unit 56 to display the hot bulk density.

[0043] When the feeder operation unit 66 acquires the hot bulk density, it reads out the target volume of coal to be charged into the coking chamber 82 from the storage unit 58. The feeder operation unit 66 calculates the weight of coal to be charged into the coking chamber 82 by multiplying the target volume of coal by the hot bulk density. The feeder operation unit 66 operates the feeder 14 to supply coal while monitoring the load cell 30, and stops the feeder 14 when the weight of coal calculated using the hot bulk density has been supplied. The feeder operation unit 66 may also display the actual value of the weight of coal charged into the coking chamber 82 on the output unit 56.

[0044] In this way, the calculation device 50 according to this embodiment charges coal of a weight corresponding to the target volume of coal to be charged in the coke chamber 82. This makes it possible to charge a large amount of coal into the coke chamber 82 without clogging the coal charging hole 84, thereby improving the productivity of the coke oven.

[0045] Next, a method for calculating the bulk density of coal charged into the coal charging hopper 10 and a method for producing coke according to this embodiment will be described. Fig. 4 is a flow diagram showing an example of the method for calculating bulk density and the method for producing coke according to this embodiment. The flow shown in Fig. 4 may be started by receiving an input from the operator via the input unit 54 to start charging coal into the coke chamber 82 before coal is charged into the coal charging hopper 10 of the coal charging car 70.

[0046] First, coal is charged into the storage vessels 12 of the five coal charging hoppers 10 of the coal loading car 70 (step S101). This step is the coal charging step in the bulk density calculation method and the coke manufacturing method. Charging the coal increases the coal charging height in the storage vessel 12. The weight specifying unit 60 uses the sensors 28 and 29 to detect the coal, and specifies the weight when the coal charging height reaches h2 and h1 (step S102). This step is the weight specifying step in the bulk density calculation method and the coke manufacturing method. The heights (h1, h2) at which the sensors 28 and 29 are provided are examples of predetermined heights in the weight specifying step.

[0047] The bulk density calculation unit 62 calculates the cold bulk density of the coal charged into the storage vessel 12 using the weight specified by the weight specification unit 60 (step S103). This step corresponds to the bulk density calculation step in the bulk density calculation method and the coke production method. The bulk density correction unit 64 corrects the cold bulk density calculated by the bulk density calculation unit 62 to the hot bulk density (step S104). This step corresponds to the bulk density correction step in the bulk density calculation method and the coke production method.

[0048] The coal loading car 70 is moved to a position where the position of the chute 32 coincides with each of the coal loading holes 84. Thereafter, the feeder operating unit 66 determines the amount of coal to be loaded into the carbonization chamber 82 by multiplying the target volume of coal to be loaded into the carbonization chamber 82 by the hot bulk density, and operates the feeder 14 to load the amount of coal into the carbonization chamber 82 (step S105). This step is the coal loading step in the coke manufacturing method. The coal loaded into the carbonization chamber 82 is carbonized in the carbonization chamber 82 (step S106). This step is the coal carbonization step in the coke manufacturing method. In this way, coke is produced by carbonizing the coal in the carbonization chamber 82 of the coke oven.

[0049] As described above, the bulk density calculation method according to this embodiment makes it possible to easily calculate the bulk density of coal charged into the coal charging hopper 10. Therefore, by implementing the bulk density calculation method according to this embodiment, it becomes possible to easily determine the bulk density of each coal charged into the coke chamber 82 of the coke oven 80. Then, in the coke manufacturing method according to this embodiment, the calculated coal bulk density is used to identify the amount of coal to be charged to achieve a target volume, and this amount of coal is charged into the coke chamber 82. This makes it possible to charge a large amount of coal into the coke chamber 82 without clogging the coal charging hole 84, and by carbonizing the coal charged in the coke chamber 82, it becomes possible to realize improved productivity of the coke oven.

[0050] In the coal loading car 70, bulk density calculation method, and coke production method according to this embodiment, an example has been shown in which the cold bulk density is corrected to the hot bulk density, but this is not limited to this. If the cold bulk density and the hot bulk density are not significantly different, the amount of coal to be loaded into the coke chamber 82 may be determined using the cold bulk density without correcting to the hot bulk density. However, because coal expands in a high-temperature environment, the hot bulk density of coal is lower than the cold bulk density. Therefore, the calculation device 50 in the coal loading car 70 according to this embodiment preferably has a bulk density correction unit 64, and the bulk density calculation method and coke production method according to this embodiment preferably have a bulk density correction step.

[0051] Furthermore, in the coal loading car 70 according to this embodiment, an example has been shown in which five coal loading hoppers 10 are controlled by one arithmetic unit 50, but this is not limited to this. The coal loading car 70 may have one arithmetic unit for each of the coal loading hoppers 10 that the coal loading car 70 has. In this case, if the coal loading car has five coal loading hoppers 10 as shown in FIG. 2, five arithmetic units are provided, and each of the five arithmetic units controls one of the five coal loading hoppers 10. [Explanation of symbols]

[0052] 10 Coal loading hopper 12 Containment Container 14 Feeder 16 Rostrum 18 Torso 19 Slope 20 Fixture 22 Shaft section 24 Fixed part 26 Locking part 28 sensors 29 Sensors 30 load cells 32 shots 40 Support member 50 Arithmetic unit 52 Control section 54 Input section 56 Output section 58 Storage area 60 Weight Specification Section 62 Bulk density calculation section 64 Bulk density correction section 66 Feeder operating section 70 Coal Car 72 Transportation 80 Coke Oven 82 Carbonization chamber 84 Charging hole 86 Rail

Claims

1. a bottomed cylindrical container for accommodating coal to be charged into a carbonization chamber of a coke oven; a feeder that transports the coal stored in the storage container to the outside; A load cell for measuring the weight of the coal charged into the container; A sensor for detecting the charging height of coal charged into the storage vessel; A coal charging hopper having

2. The coal loading hopper according to claim 1 , wherein the two or more sensors are provided at two or more different positions in the height direction within the storage vessel.

3. 2. The coal charging hopper of claim 1, wherein the sensor is a limit switch that detects the presence of coal within a predetermined range.

4. 3. The coal charging hopper of claim 2, wherein the sensor is a limit switch that detects the presence of coal within a predetermined range.

5. The coal loading hopper according to claim 3, wherein the limit switch is positioned so that a measuring portion of the limit switch faces downward and is positioned at a distance of 10 mm to 50 mm from a side surface of the storage container.

6. The coal loading hopper according to claim 4, wherein the limit switch is positioned so that a measuring portion of the limit switch faces downward and is positioned at a distance of 10 mm to 50 mm from a side surface of the storage container.

7. The limit switch is a capacitance type limit switch, 4. The coal charging hopper according to claim 3, wherein the measuring portion of the limit switch is covered with a fluororesin.

8. The limit switch is a capacitance type limit switch, 5. The coal charging hopper according to claim 4, wherein the measuring portion of the limit switch is covered with a fluororesin.

9. The limit switch is a capacitance type limit switch, 6. The coal charging hopper according to claim 5, wherein the measuring portion of the limit switch is covered with a fluororesin.

10. The limit switch is a capacitance type limit switch, 7. The coal charging hopper according to claim 6, wherein the measuring portion of the limit switch is covered with a fluororesin.

11. A coal charging hopper according to any one of claims 1 to 10; A calculation device that calculates the bulk density of the coal charged in the storage vessel; Means of transportation, and The computing device includes a weight specifying unit that specifies the weight of the load cell when the sensor detects the charging height of the coal; A bulk density calculation unit that calculates a cold bulk density of the coal charged into the storage vessel using the weight specified by the weight specifying unit; A coal-loading car with a.

12. 12. A coal loading car according to claim 11, wherein the calculation device further comprises a bulk density correction unit that corrects the cold bulk density to a hot bulk density.

13. A bulk density calculation method for calculating the bulk density of coal charged into a coal charging hopper having a storage container for storing coal, a coal charging step of charging coal into the storage vessel; a weight specifying step of specifying a weight of the coal when a charging height of the coal charged in the storage vessel reaches a predetermined height; A bulk density calculation step of calculating a cold bulk density of the coal charged into the storage vessel using the weight; A bulk density calculation method comprising:

14. The bulk density calculation method according to claim 13, further comprising a bulk density correction step of correcting the cold bulk density calculated in the bulk density calculation step to a hot bulk density.

15. a charging step of specifying a charging amount of coal to be charged from the coal charging hopper to a coke chamber of a coke oven using the hot bulk density calculated by the bulk density calculation method according to claim 14, and charging the specified amount of coal into the coke oven; a coal carbonization step of carbonizing the coal charged in the carbonization chamber; A method for producing coke, comprising:

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