Method for operating vertical gas retort, method for producing ferrocoke, and vertical gas retort equipment

Abstract

The invention provides a method for operating a vertical gas retort, a method for manufacturing ferrocoke, and a device for controlling the vertical gas retort, which can detect abnormal operation of the vertical gas retort caused by destruction of ventilation balance in the retort. A method for operating a vertical retort for producing ferro-coke, in which the vertical retort (10) has: a retort main body (12); one or more high-temperature tuyeres (13) for blowing high-temperature gas into the gas retort main body; and two or more exhaust ports (16) which are provided at different positions in the height direction from the high-temperature tuyeres (13) and which discharge gas in the gas retort main body, the two or more exhaust ports (16) being provided at different positions in the width direction, the two or more exhaust ports (16) being provided at the same height and having different positions in the width direction. The flow rate acquisition unit acquires the flow rate of the gases discharged from the respective exhaust ports (16). And a determination step for determining that an operation is abnormal when the flow rate acquired by the acquisition step is outside a predetermined flow rate range.

Description

Technical Field

[0001] The invention relates to an operating method of a vertical retort furnace for manufacturing iron coke, a method for manufacturing iron coke and vertical retort furnace equipment. Background Art

[0002] Ferro-coke is produced by dry distilling coal together with iron-containing materials such as iron ore, and contains fine-particle metallic iron generated by the reduction of iron-containing materials. The metallic iron has the function of promoting the reaction of CO2 generated with the progress of the reaction in the blast furnace with coke (C) to regenerate CO as a reducing gas. Therefore, if ferro-coke is used, the gasification reaction of coke starts from the low temperature part in the blast furnace, so the temperature of the heat preservation zone can be reduced. Therefore, it is believed that the use of ferro-coke can greatly reduce the ratio of reducing materials, which can help save energy and reduce CO2 emissions. Due to such usefulness, research on the manufacturing technology of ferro-coke is underway.

[0003] Conventional coke ovens are made of silica bricks. Therefore, if iron ore is loaded and distilled, silicon dioxide, which is the main component of the silica bricks, reacts with the iron ore to generate low-melting-point fayalite. Since the damage to the silica bricks caused by this reaction becomes a problem, the manufacture of iron coke using conventional coke ovens is not implemented in industry. Therefore, as a method for manufacturing iron coke instead of the manufacturing method using a coke oven, a manufacturing method using a vertical distillation furnace is proposed.

[0004] In this manufacturing method, a vertical retort furnace composed of refractory bricks rather than silica bricks is used. In addition, coal and iron ore as raw materials are mixed with a binder, and the resulting shaped product is placed in the vertical retort furnace. Then, a heat medium gas is blown into the vertical furnace and heated, thereby retorting the shaped product to produce shaped iron coke. By using this method, the shaped coal can be retorted uniformly without damaging the bricks with iron ore.

[0005] As a vertical pyrolysis furnace used for producing iron coke, Patent Document 1 discloses a vertical pyrolysis furnace capable of uniformly heating a molded product by providing a gas exhaust port in a pyrolysis furnace body to control the flow of a high-temperature gas.

[0006] In addition, a heating rate design method for dry distilling a molded product under optimal heating conditions is disclosed in Patent Document 2. According to Patent Document 2, by dry distilling a molded product under an optimal heating pattern, cracks and thermal cracks in the molded product generated during dry distillation can be prevented, thereby suppressing the degradation of the quality of the iron coke.

[0007] Prior art literature

[0008] Patent Literature

[0009] Patent Document 1: Japanese Patent No. 6274126

[0010] Patent Document 2: Japanese Patent No. 5087868 Summary of the invention

[0011] Problems to be solved by the invention

[0012] If fine powder is mixed into a vertical dry distillation furnace, the ventilation balance in the furnace will be destroyed, so even if a gas outlet is set, the flow of high-temperature gas cannot be controlled. Similarly, if the ventilation balance in the furnace is destroyed due to the mixing of fine powder, the heating mode cannot be controlled. If the ventilation balance in the furnace is destroyed and the temperature difference in the furnace in the horizontal direction becomes large, the molded product dry distilled in the low temperature area will become poorly dry distilled, and there is a problem of producing low-strength iron coke that cannot be used as a blast furnace raw material.

[0013] The present invention has been made in view of the above problems in the prior art, and an object of the present invention is to provide a method for operating a vertical pyrolysis furnace, a method for producing ferrocarbon, and a control device for a vertical pyrolysis furnace capable of detecting an operational abnormality of the vertical pyrolysis furnace caused by a breakdown of ventilation balance in the furnace.

[0014] Means for solving problems

[0015] The gist of the present invention that can solve the above-mentioned problems is as follows.

[0016] [1] A method for operating a vertical pyrolysis furnace, the vertical pyrolysis furnace being used to manufacture iron coke, wherein the vertical pyrolysis furnace comprises: a pyrolysis furnace body; one or more high-temperature tuyere for blowing high-temperature gas into the pyrolysis furnace body; and two or more exhaust tuyere for discharging gas from the pyrolysis furnace body at positions different from the high-temperature tuyere in a height direction, the two or more exhaust tuyere for discharging gas from the pyrolysis furnace body, the two or more exhaust tuyere for discharging gas at the same height and at different positions in a width direction, the method for operating the vertical pyrolysis furnace comprising: an acquisition step for acquiring flow rates of gases respectively discharged from the exhaust tuyere; and a determination step for determining that an operation is abnormal when the flow rates acquired in the acquisition step are outside a predetermined flow rate range.

[0017] [2] The method for operating a vertical dry distillation furnace according to [1], wherein in the acquisition step, the flow rate of the gas exhausted from each of the exhaust ports is acquired by measuring the vibration of each of the exhaust ports.

[0018] [3] The method for operating a vertical dry distillation furnace according to [2], wherein, in the acquisition step, the flow rate of the gas discharged from each exhaust port is acquired based on the vibration after removing the frequency component of the vibration that causes interference, and the frequency component of the vibration that causes interference is determined by performing a principal component analysis on the frequency component of the vibration that causes interference in advance and calculating the load of the principal component.

[0019] [4] The method for operating a vertical distillation furnace according to [3], wherein the frequency component of the vibration that becomes the disturbance is determined by evaluating, for each frequency, an existence ratio at which a load amount of the principal component obtained by the principal component analysis becomes equal to or greater than a predetermined value.

[0020] [5] The method for operating a vertical dry distillation furnace according to any one of [1] to [4], wherein in the acquisition step, the furnace temperatures at two or more positions that are the same in the height direction and different in the width direction are also acquired, and an operation abnormality is determined when the difference between the furnace temperatures is greater than a predetermined temperature difference.

[0021] [6] The method for operating a vertical retort furnace according to any one of [1] to [5], further comprising an adjustment step, wherein when the operation is determined to be abnormal in the determination step, the adjustment step adjusts the flow rate of the gas exhausted from the exhaust port so that the flow rate is within a predetermined flow rate range.

[0022] [7] A method for producing carbon iron ore, comprising operating a vertical carbonization furnace using the method for operating a vertical carbonization furnace described in [6] to produce carbon iron ore.

[0023] [8] A vertical pyrolysis furnace facility for producing iron coke, wherein the vertical pyrolysis furnace facility comprises: a vertical pyrolysis furnace; two or more flow sensors for measuring the flow rate of gas; and a control device for controlling the vertical pyrolysis furnace, wherein the vertical pyrolysis furnace comprises: a pyrolysis furnace body; a loading port for loading a shaped object as a raw material of iron coke; one or more high-temperature tuyere for blowing high-temperature gas into the pyrolysis furnace body; two or more extraction tuyere disposed at positions different from the high-temperature tuyere in a height direction and discharging gas in the pyrolysis furnace body; and a discharge port for discharging the shaped object after pyrolysis, wherein the two or more extraction tuyere are disposed at positions different from the high-temperature tuyere in a width direction, and the two or more flow sensors are disposed at the two or more extraction tuyere, respectively, and the control device comprises: an acquisition unit for acquiring data indicating the flow rate of gas discharged from the extraction tuyere from the flow sensors; a calculation unit for calculating the flow rate of gas discharged from each extraction tuyere based on the data; and a determination unit for determining that the operation is abnormal when the flow rate is outside a predetermined flow rate range.

[0024] [9] The vertical retort furnace equipment according to [8], wherein the flow sensor is a vibration meter.

[0025]

[10] The vertical distillation furnace facility according to [9], further comprising an interference removal filter configured to remove a predetermined frequency component from the vibration measured by the vibration meter.

[0026]

[11] The vertical retort furnace facility according to

[10] , wherein the frequency component is determined in advance by performing principal component analysis on the frequency component of the vibration that becomes the disturbance and evaluating, for each frequency, the existence ratio of the load amount of the principal component being equal to or greater than a predetermined value.

[0027]

[12] The vertical retort furnace equipment according to any one of [8] to

[11] , wherein the vertical retort furnace equipment further comprises two or more temperature sensors, the temperature sensors measuring the temperature inside the furnace, the temperature sensors being arranged at two or more positions having the same height and different widths in the vertical retort furnace, the acquisition unit acquiring the temperature inside the furnace from each temperature sensor, and the determination unit determining that the operation is abnormal when a difference between the temperatures inside the furnace acquired from each temperature sensor is equal to or greater than a predetermined temperature difference.

[0028]

[13] The vertical distillation furnace equipment according to any one of [8] to

[12] , wherein when the determination unit determines that there is an operational abnormality, the determination unit adjusts the flow rate of the gas exhausted from the exhaust port so that the flow rate is within a predetermined flow rate range.

[0029] Effects of the Invention

[0030] By implementing the method for operating a vertical pyrolysis furnace of the present invention, it is possible to detect abnormal operation of the vertical pyrolysis furnace caused by the destruction of the ventilation balance in the furnace. Thus, if the abnormal operation of the vertical pyrolysis furnace can be detected, measures can be taken to restore the ventilation balance in the furnace, thereby preventing the production of low-strength iron coke due to poor pyrolysis. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] [ Figure 1 ] Figure 1 It is a perspective schematic diagram of a vertical distillation furnace facility 100 capable of implementing the operating method of the vertical distillation furnace according to the present embodiment.

[0032] [ Figure 2 ] Figure 2 1 is a schematic cross-sectional view of a vertical retorting furnace 10 .

[0033] [ Figure 3 ] Figure 3 It is a cross-sectional schematic diagram of the exhaust air outlet 16.

[0034] [ Figure 4 ] Figure 4 It is a schematic diagram showing the flow path of the gas exhausted from the exhaust port 16 .

[0035] [ Figure 5 ] Figure 5 It is a block diagram showing the structure of the control device 50.

[0036] [ Figure 6 ] Figure 6 This is a graph showing the relationship between the effective value of acceleration and the flow rate of gas.

[0037] [ Figure 7 ] Figure 7 It is a graph showing the relationship between the effective value of the acceleration of the exhaust air port 16 and the total flow rate.

[0038] [ Figure 8 ] Figure 8 This is a graph showing the existence ratio of gas and vibrations that become disturbances with high correlation coefficients.

[0039] [ Fig. 9 ] Fig. 9 This is a graph showing the existence ratio of high correlation coefficients of vibrations that serve as disturbances.

[0040] [ Fig.10 ] Fig.10 This is a flowchart showing an example of the process of the operating method of the vertical dry distillation furnace according to the present embodiment.

[0041] [ Fig.11 ] Fig.11 This is a flowchart showing another example of the process of the operating method of the vertical dry distillation furnace according to the present embodiment.

[0042] [ Fig.12 ] Fig.12 Graph showing changes in the furnace temperatures of Unit A and Unit B. DETAILED DESCRIPTION

[0043] Hereinafter, the present invention will be described by referring to the embodiments of the present invention. Figure 1 1 is a perspective view of a vertical distillation furnace facility 100 capable of implementing the method for operating the vertical distillation furnace of the present embodiment. Figure 2 1 is a schematic cross-sectional view of a vertical retorting furnace 10 . Figure 2 (a) is Figure 1 AA section view, Figure 2 (b) is Figure 2 (a) BB cross-sectional view.

[0044] The vertical pyrolysis furnace facility 100 is a facility for producing ferrocoke by pyrolysis of a shaped product of a raw material for ferrocoke. The shaped product of the raw material for ferrocoke is produced by cold forming a raw material including an iron-containing raw material such as iron ore, a carbon-containing raw material such as coal, and a binder by a roll forming machine.

[0045] like Figure 1 and Figure 2 As shown, the vertical dry distillation furnace equipment 100 includes a vertical dry distillation furnace 10, an acceleration sensor 20, a temperature sensor 30, a flow control valve 40, and a control device 50. In addition, the vertical dry distillation furnace 10 includes a charging port 11, a dry distillation furnace body 12, a high temperature air port 13, a low temperature air port 14, a cooling air port 15, an exhaust air port 16, and a discharge port 17. The charging port 11 is provided above the dry distillation furnace body 12. The charging port 11 is an opening for charging a shaped object, which is a raw material for iron coke, into the dry distillation furnace body 12. Two charging ports 11 are provided in the vertical dry distillation furnace 10.

[0046] The dry distillation furnace body 12 is a cylindrical furnace with a rectangular horizontal section, and is composed of two furnace walls 12a provided at the long sides of the horizontal section and two furnace walls 12b provided at the short sides of the horizontal section. Refractory materials are provided inside the furnace walls 12a and 12b, and iron sheets as external structures are provided outside.

[0047] The discharge port 17 is provided at the lower end of the dry distillation furnace body 12. The coke produced by dry distillation in the furnace is discharged from the discharge port 17. The coke discharged from the discharge port 17 is conveyed to a product hopper (not shown) by a conveying conveyor (not shown) and used as a blast furnace raw material.

[0048] Four high-temperature tuyere 13 are respectively provided on the two furnace walls 12a, and a total of eight are provided. The four high-temperature tuyere 13 are equally spaced and arranged at different positions in the same height and width direction. A high-temperature gas heated to, for example, 800 to 1100°C is blown into the furnace from the high-temperature tuyere 13 by a heating device arranged outside the furnace. It is preferred that a high-temperature gas heated to 900 to 1000°C is blown into the furnace from the high-temperature tuyere 13. It should be noted that, in the present embodiment, the width direction refers to the direction in which the horizontal section of the carbonization furnace body 12 becomes the long side.

[0049] The low-temperature tuyere 14 is provided at the same position as the high-temperature tuyere 13 in the width direction of the two furnace walls 12a, and at a position higher than the high-temperature tuyere 13 in the height direction, 4 of which are provided, and a total of 8 are provided. Through a heating device provided outside the furnace, for example, a low-temperature gas heated to 400-700°C is blown into the furnace from the low-temperature tuyere 14. In this way, the high-temperature tuyere 13 and the low-temperature tuyere 14 are provided on the upper and lower layers of the vertical dry distillation furnace 10, and high-temperature gas and low-temperature gas are blown in from these tuyere. As a result, compared with the case where high-temperature air is blown in through a high-temperature tuyere on one layer, the formed object can be heated in a wide range, and it becomes a vertical dry distillation furnace that can efficiently dry distill the formed object.

[0050] Four cooling tuyere 15 are provided on each of the two furnace walls 12a near the discharge port 17, and a total of eight cooling tuyere 15 are provided. Cooling gas at 25 to 80°C is blown into the furnace from the cooling tuyere 15. In this way, by blowing cooling gas from the cooling tuyere 15, the temperature of the carbonized iron coke discharged from the discharge port 17 can be lowered, so that the formed product can be continuously carbonized. In addition, if the temperature of the carbonized iron coke can be lowered in this way, it is not necessary to provide a cooling device for cooling the carbonized iron coke, so that the equipment cost of the cooling device and the transportation cost of transporting the carbonized iron coke to the cooling device can be reduced.

[0051] The exhaust vents 16 are provided at the same position as the high temperature vents 13 in the width direction of the two furnace walls 12a, and four are provided between the cooling vents 15 and the high temperature vents 13 in the height direction, for a total of eight. The high temperature gas, the low temperature gas, and the gas at 0 to 500°C after the confluence of the cooling gas are discharged from the exhaust vents 16 to the outside of the furnace. In this way, by arranging the high temperature vents 13, the low temperature vents 14, and the exhaust vents 16 at different positions facing each other at equal intervals in the width direction of the two furnace walls 12a, the furnace temperature in the horizontal section of the dry distillation furnace body 12 is uniformed.

[0052] Figure 3 1 is a schematic cross-sectional view of the exhaust air port 16. A flow control valve 40 is provided at the front end of each exhaust air port 16. By adjusting the opening of the flow control valve 40, the flow rate of the gas discharged from the exhaust air port 16 is adjusted. In addition, two branch portions 19 are provided on the exhaust air port 16. By providing two branch portions 19, dust and foreign matter contained in the gas discharged from the exhaust air port 16 can be separated to the branch portions 19.

[0053] The acceleration sensor 20 is provided on the outer wall surface of each exhaust air port 16. The acceleration sensor 20 measures vibration data of the outer wall surface of the exhaust air port 16 as data indicating the flow rate of the gas discharged from the exhaust air port 16. The acceleration sensor 20 outputs the measured vibration data together with the identification data of the acceleration sensor to the control device 50. In addition, in the present embodiment, the acceleration sensor 20 is an example of a vibration meter.

[0054] Refer again Figure 2 Eight temperature sensors 30 are provided at the same height and at different positions in the width direction at equal intervals on the inner wall surfaces of the two furnace walls 12a. Figure 2 In the example shown, the temperature sensors 30 are respectively arranged at the same positions as the air outlet 16 in the width direction and near the air outlet 16. The temperature sensor 30 measures the temperature in the furnace at each position, and outputs the acquired temperature data together with the identification data of the temperature sensor to the control device 50. It should be noted that the temperature sensor 30 is not limited to being arranged near the air outlet 16, but may be arranged at each position in the dry distillation furnace body 12 at different height directions.

[0055] The control device 50 obtains data indicating the flow rate of gas from the acceleration sensor 20, and calculates the flow rate of gas exhausted from the exhaust port 16 based on the data. The control device 50 determines whether the calculated flow rate of gas is outside a predetermined flow rate range.

[0056] When the ventilation balance in the vertical dry distillation furnace 10 is disrupted due to deterioration of the ventilation property of a part of the region, the flow rate of the gas discharged from the exhaust air port 16 provided at the same width direction position as the region with deteriorated ventilation property becomes smaller, and the flow rate of the gas discharged from the other exhaust air ports 16 becomes larger. Therefore, by determining whether the flow rate of the gas discharged from the exhaust air port 16 is outside the predetermined flow rate range, it is possible to detect an operational abnormality of the vertical dry distillation furnace 10 caused by the disruption of the ventilation balance in the furnace. In addition, the predetermined flow rate range is determined to be a flow rate range that can maintain the horizontal temperature difference in the furnace at less than 50°C, using the flow rate of the gas discharged from the exhaust air port 16 under normal operating conditions and the flow rate of the gas discharged from the exhaust air port 16 when the ventilation balance is experimentally disrupted and the temperature difference in the furnace in the horizontal direction is 50°C.

[0057] The control device 50 determines that the vertical dry distillation furnace 10 is operating abnormally when the flow rate of the gas discharged from the exhaust port 16 is outside the predetermined flow rate range. On the other hand, the control device 50 determines that the vertical dry distillation furnace 10 is operating normally when the flow rate of the gas discharged from the exhaust port 16 is within the predetermined flow rate range. Thus, the control device 50 can detect the abnormal operation of the vertical dry distillation furnace 10 caused by the destruction of the ventilation balance in the furnace.

[0058] When it is determined that the operation of the vertical dry distillation furnace 10 is abnormal, the control device 50 adjusts the flow rate of the gas discharged from the extraction air port 16 by adjusting the opening of the flow control valve 40 so that the flow rate of the gas discharged from the extraction air port 16 is within a predetermined flow rate range. For example, when the flow rate of the gas discharged from a specific extraction air port 16 exceeds a predetermined flow rate range, the control device 50 reduces the opening of the flow control valve 40 of the extraction air port 16 to reduce the flow rate of the gas discharged from the extraction air port 16. As a result, the flow rate of the gas discharged from the specific extraction air port 16 is reduced, and the flow rate of the gas can be within the predetermined flow rate range.

[0059] In addition, the predetermined flow range is not limited to the flow range of the gas, and can be the upper limit value of the gas flow rate or the lower limit value of the gas flow rate. When the upper limit value is determined, it is determined to be outside the flow range when it exceeds the upper limit value. In addition, when the lower limit value is determined, it is determined to be outside the flow range when it is less than the lower limit value. In addition, if the flow rate (reference flow rate) of the gas discharged from the exhaust air port 16 during normal operation is set to 100, the upper limit value of the predetermined flow range is, for example, 114. That is, the control device 50 determines that the operation is abnormal when the gas flow rate is greater than 1.14 times the reference flow rate. In addition, the upper limit value is determined based on the increase in the flow rate of the gas in the other exhaust air ports 16 when one of the eight exhaust air ports 16 is blocked.

[0060] In addition, when the flow rate of the gas discharged from the exhaust port 16 is less than the predetermined flow rate range, the control device 50 increases the opening of the flow regulating valve 40 to increase the flow rate of the gas discharged from the exhaust port 16. As a result, the flow rate of the gas discharged from the specific exhaust port 16 is increased and the flow rate can be within the predetermined flow rate range.

[0061] In addition, the control device 50 may obtain the temperature in the furnace from the temperature sensor 30. The control device 50 may also determine that the operation is abnormal when the difference in the temperature in the furnace obtained from the temperature sensor 30 installed at the same height is greater than a predetermined temperature difference. That is, in this case, the control device 50 may also determine that the operation of the vertical retorting furnace 10 is abnormal when the flow rate of the gas is outside the predetermined flow rate range and the difference in the temperature in the furnace is greater than a predetermined temperature difference. In addition, in the present embodiment, the predetermined temperature difference is, for example, 50°C.

[0062] If the temperature difference in the furnace in the horizontal section of the lower part of the furnace is 50°C or more, uneven cooling of the formed product occurs, and high-temperature coke is discharged from the discharge port 17, which may cause heating and ignition in the product hopper. Therefore, in order to reliably maintain the temperature difference in the furnace in the horizontal section at less than 50°C, the flow rate range is set in consideration of the prescribed safety factor. Therefore, even if the flow rate of the gas discharged from the exhaust port 16 is outside the predetermined flow rate range, the temperature difference in the furnace in the horizontal section may not be greater than the predetermined temperature difference. In contrast, by detecting an operational abnormality of the vertical dry distillation furnace 10 based on the temperature difference in the furnace, an operational abnormality of the vertical dry distillation furnace 10 can be detected more reliably.

[0063] In the vertical retorting furnace 10, if the flow rate of gas increases, the temperature in the furnace decreases, and if the flow rate of gas decreases, the temperature in the furnace increases. In addition, if the flow rate of gas discharged from the extraction port 16 is increased, the flow rate of cooling gas increases, so the temperature in the furnace near the extraction port 16 becomes lower. On the other hand, if the flow rate of gas discharged from the extraction port 16 is reduced, the flow rate of cooling gas decreases, and a high-temperature formed object passes through, so the temperature in the furnace near the extraction port 16 becomes higher.

[0064] Therefore, when it is determined that the vertical retort furnace 10 is operating abnormally, the control device 50 adjusts the opening of the flow control valve 40 to adjust the flow rate of the gas discharged from the exhaust port 16 so that the difference in the furnace temperature is less than a predetermined temperature. For example, the control device 50 increases the opening of the flow control valve 40 at the position of the temperature sensor that outputs a higher furnace temperature to increase the flow rate of the gas discharged from the exhaust port 16. As a result, the furnace temperature at the position that outputs a higher furnace temperature can be lowered, so that the difference in the furnace temperature can be less than a predetermined temperature.

[0065] Figure 4 Schematic diagram showing the flow path of the gas discharged from the exhaust port 16. Figure 4 As shown, the gases exhausted from the eight exhaust ports 16 merge into one flow path 70 and are exhausted. In the flow path 70, as operation data of the vertical retorting furnace 10, the pressure of the gas is measured by a pressure sensor 72, the flow rate of the gas is measured by a flow rate sensor 74, and the temperature of the gas is measured by a temperature sensor 76. These operation data are output to the control device 50 and stored in the control device 50.

[0066] Figure 5 1 is a block diagram showing the structure of the control device 50. The control device 50 is, for example, a general-purpose computer such as a workstation or a personal computer. The control device 50 includes 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 by executing a program read from the storage unit 58, the control unit 52 functions as an acquisition unit 60, a calculation unit 62, and a determination unit 64.

[0067] The input unit 54 is, for example, a keyboard, a touch panel integrated with a display, etc. The output unit 56 is, for example, an LCD or CRT display, etc. The storage unit 58 is, for example, an updateable flash memory, a hard disk built in or connected via a data communication terminal, a memory card, and other information recording media and their read / write devices. The storage unit 58 stores programs for the control unit 52 to execute various functions, data used by the programs, etc.

[0068] The vibration data output from the acceleration sensor 20 provided at each exhaust port 16 is amplified by the amplifier 22, and the low-frequency component is removed by the HPF (high-pass filter) 24. The acquisition unit 60 acquires the vibration data amplified and with the low-frequency component removed and the identification data of the acceleration sensor 20. The acquisition unit 60 outputs the acquired vibration data and identification data to the calculation unit 62.

[0069] The calculation unit 62 converts the acquired vibration data into an effective value of acceleration. The calculation unit 62 reads a regression equation representing the correspondence between the gas flow rate and the effective value of acceleration from the storage unit 58 and calculates the flow rate of gas discharged from each exhaust port 16 using the effective value of acceleration and the regression equation.

[0070] Here, the relationship between the gas flow rate and vibration data is explained. An acceleration sensor is installed on a JIS standard 25A steel pipe, and vibration data when 0 to 25 L / min of air flows through the steel pipe is obtained to confirm the relationship between the gas flow rate and vibration data flowing through the steel pipe. As vibration data, the effective value of acceleration is used. The effective value of acceleration in the 0 to T interval in the vibration data represented by f(t) can be calculated using the following formula (1).

[0071] [Formula 1]

[0072]

[0073] Figure 6 This is a graph showing the relationship between the effective value of acceleration and the flow rate of gas. Figure 6 In the figure, the horizontal axis is the flow rate (L / min) and the vertical axis is the effective value of acceleration (m / s 2 ).like Figure 6 As shown in FIG. 1 , when the gas flow rate increases, the acceleration effective value also increases. From this result, it is confirmed that there is a correlation between the gas flow rate and the acceleration effective value.

[0074] Therefore, the acceleration sensor 20 was installed on the outer wall surface of the exhaust port 16 using the vertical dry distillation furnace 10, and the relationship between the vibration data and the flow rate was confirmed when the flow rate of the gas discharged from the exhaust port 16 was changed. It should be noted that the gas just discharged from the exhaust port 16 contains powder of pulverized coal and volatile components volatilized from the pulverized coal, and the temperature of the gas is close to 500°C, so it is difficult to measure with a normal flow meter, so the gas discharged from the eight exhaust ports 16 was merged, and the flow rate of the gas after the dust and the like contained in the gas were removed was measured using a throttle flow meter.

[0075] Figure 7 : is a graph showing the relationship between the effective value of the acceleration of the exhaust air port 16 and the total flow rate. Figure 7 In the figure, the horizontal axis is the total flow rate (L / min) and the vertical axis is the effective value of acceleration (m / s 2 ). The effective value of the acceleration is given by Figure 4 The total value of the effective values ​​of the vibrations measured by the eight acceleration sensors 20 shown. Figure 7 As shown, it is confirmed that the effective value of acceleration increases in proportion to the total flow rate. In this way, since there is a corresponding relationship between the effective value of acceleration and the total flow rate, if a regression equation representing the corresponding relationship between the flow rate of gas and the effective value of acceleration is obtained in advance, the flow rate of gas discharged from the exhaust port 16 can be calculated using the effective value of acceleration and the regression equation.

[0076] Therefore, if a regression equation representing the correspondence between the gas flow rate and the effective value of acceleration is obtained in advance and stored in the storage unit 58, the calculation unit 62 can calculate the flow rate of the gas discharged from each exhaust port 16 using the effective value of acceleration and the regression equation. The calculation unit 62 outputs the gas flow rate calculated in this way to the determination unit 64.

[0077] It should be noted that the vibration data output from the acceleration sensor 20 includes not only the vibration caused by the gas discharged from the exhaust port 16, but also the vibration of the dry distillation furnace body 12. The frequency of the vibration of the dry distillation furnace body 12 is often expressed in a low-frequency band, so, for example, by using the above-mentioned HPF24 to remove the low-frequency component of the vibration data, the calculation accuracy of the gas flow rate is improved. In addition, HPF24 is an example of an interference removal filter that removes the frequency component of the vibration that becomes interference.

[0078] Next, the frequency components removed by HPE24 are described. The vibration data output from the acceleration sensor 20 includes not only the vibration of the gas, but also the vibration that becomes interference to peripheral equipment, etc. Therefore, if the vibration data is used directly, there is a situation where the calculation accuracy of the gas flow rate becomes low. Therefore, the production volume of iron coke is changed, and the vibration that causes the flow rate of the gas discharged from the exhaust port 16 and the vibration change that becomes interference and the vibration that causes the vibration of the peripheral equipment, etc., to become interference without exhausting the gas are measured. The frequency analysis (FFT) results of these vibration data are subjected to principal component analysis to find the proportion of high correlation coefficients with a load of 0.7 or more for the first principal component. Here, the proportion of high correlation coefficients refers to the proportion of numbers with a load of 0.7 or more for the first principal component per 100 Hz by analyzing the signal intensity at every 1 Hz in the range of up to 12.5 kHz through frequency analysis, and performing principal component analysis on the obtained frequency analysis data.

[0079] Figure 8 This is a graph showing the existence ratio of gas and vibrations that become interference with high correlation coefficients. Fig. 9 This is a graph showing the proportion of vibrations with high correlation coefficients that become interference. Figure 8 , Fig. 9 In the figure, the horizontal axis is the frequency (Hz), and the vertical axis is the existence ratio (%) of the high correlation coefficient.

[0080] like Figure 8 As shown in FIG. 1 , in the gas and the vibration that causes interference, there is a high correlation coefficient of 0.7 or more in the first principal component load in the entire frequency band. Based on this result, it is confirmed that a wide frequency component contributes to the vibration of the gas and the vibration that causes interference. On the other hand, Fig. 9 As shown in the figure, in the vibration that becomes interference, the high correlation coefficient of the load of the first principal component of 0.7 or more exists in the frequency band below 5kHz, and almost does not exist in the frequency band higher than 5kHz. Based on this result, it is confirmed that the frequency components below 5kHz contribute to the vibration of interference. In addition, the value indicating high correlation, that is, the load of the first principal component of 0.7 is an example of a predetermined principal component load.

[0081] As described above, the frequency components below 5 kHz contribute to the vibration that becomes interference, so if the frequency components below 5 kHz in the vibration data are removed using HPF24, the influence of the vibration that becomes interference becomes smaller, so the calculation accuracy of the gas flow rate is improved. In this way, in the operating method of the vertical distillation furnace of the present embodiment, the vibration that becomes interference and is not related to the gas flow rate is subjected to frequency analysis to obtain the frequency component, the frequency component is preliminarily subjected to principal component analysis, and the existence ratio of the load amount of the first principal component becoming more than a predetermined value is evaluated for each frequency. In this way, the frequency component that contributes to the vibration that becomes interference can be determined in advance, and the frequency component can be removed from the vibration data using the interference removal filter, thereby improving the calculation accuracy of the gas flow rate.

[0082] In the above example, an example of using HPE24 to remove frequency components below 5kHz that become interference is shown, but it is not limited to this. The frequency components of the vibration that becomes interference may vary depending on the type of peripheral equipment and the size of the equipment. Therefore, the interference removal filter that removes the frequency components of the vibration that becomes interference is not limited to HPE, and a bandpass filter or low-pass filter that removes specified frequency components can also be used. Moreover, the principal component for evaluating the load is not limited to the first principal component, and the principal components after the second principal component can also be evaluated. It is sufficient to evaluate the load of the principal component related to the vibration that becomes interference.

[0083] The determination unit 64 determines whether the flow rate of the gas obtained from the calculation unit 62 is outside the predetermined flow rate range. As described above, the predetermined flow rate range is predetermined using the flow rate of the gas discharged from the exhaust tuyere 16 in the normal operation state and the flow rate of the gas discharged from the exhaust tuyere 16 when the ventilation balance is experimentally disrupted so that the temperature difference in the width direction of the furnace becomes 50° C., and is stored in the storage unit 58.

[0084] The determination unit 64 reads a predetermined flow rate range from the storage unit 58, and determines whether the flow rate of the gas obtained from the operation unit 62 is outside the predetermined flow rate range. When the flow rate of the gas obtained from the operation unit 62 is outside the predetermined flow rate range, the determination unit 64 determines that an operational abnormality caused by the destruction of the ventilation balance in the furnace has occurred. On the other hand, when the flow rate of the gas obtained from the operation unit 62 is within the predetermined range, the operation unit 62 determines that an operational abnormality caused by the destruction of the ventilation balance in the furnace has not occurred. The operation unit 62 may also cause the output unit 56 to display an image indicating that an operational abnormality has occurred when it is determined that an operational abnormality caused by the destruction of the ventilation balance in the furnace has occurred. In this way, the vertical distillation furnace equipment 100 of the present embodiment detects an operational abnormality of the vertical distillation furnace 10 caused by the destruction of the ventilation balance in the furnace.

[0085] When it is determined that an operational abnormality has occurred due to the destruction of the ventilation balance in the furnace, the determination unit 64 preferably adjusts the opening of the flow control valve 40 to adjust the flow rate of the gas discharged from the exhaust air port 16. When the flow rate of the gas discharged from the specific exhaust air port 16 exceeds the predetermined flow rate range, the determination unit 64 reads out the table representing the correspondence between the identification data and the setting position stored in the storage unit 58, and determines the setting position of the specific exhaust air port 16 with reference to the table. The determination unit 64 outputs a signal to reduce the opening of the flow control valve 40 set at the specific exhaust air port 16 to reduce the opening. In this way, the flow rate of the gas discharged from the specific exhaust air port 16 can be reduced, so that the flow rate of the gas discharged from the specific exhaust air port 16 can be adjusted to be within the predetermined flow rate range.

[0086] In addition, the control device 50 may also obtain temperature data from the temperature sensor 30. In this case, the acquisition unit 60 obtains temperature data from each temperature sensor 30. The acquisition unit 60 outputs the obtained temperature data to the calculation unit 62. The calculation unit 62 determines the highest temperature data and the lowest temperature data among the four temperature data set at the same furnace wall 12a and at the same height. The calculation unit 62 calculates the difference in the temperature inside the furnace by obtaining the difference between the two temperature data. The calculation unit 62 outputs the calculated difference in the temperature inside the furnace to the determination unit 64.

[0087] The determination unit 64 determines whether the difference in the temperature in the furnace obtained from the calculation unit 62 is a predetermined 50°C or more. When the difference in the temperature in the furnace obtained from the calculation unit 62 is 50°C or more, the determination unit 64 determines that an operation abnormality has occurred. On the other hand, when the temperature difference obtained from the calculation unit 62 is less than 50°C, the calculation unit 62 determines that no operation abnormality has occurred. When the calculation unit 62 determines that an operation abnormality has occurred, the output unit 56 may display an image indicating that an operation abnormality has occurred.

[0088] When it is determined that an operational abnormality has occurred, the determination unit 64 adjusts the opening of the flow control valve 40 to adjust the flow rate of the gas discharged from the exhaust air port 16. The determination unit 64 determines the temperature sensor that outputs the highest temperature data and the temperature sensor that outputs the lowest temperature data, and obtains the identification data of these sensors. For example, in the case of lowering the highest temperature, the determination unit 64 determines the exhaust air port 16 set at the same width direction position as the temperature sensor that outputs the highest temperature data. The determination unit 64 outputs a signal to increase the opening to the flow control valve 40 set at the determined exhaust air port 16, thereby increasing the opening of the flow control valve 40. As a result, the flow rate of low-temperature gas flowing to the position that outputs the highest furnace temperature increases, so that the position is cooled and the temperature is lowered, and as a result, the difference in furnace temperature can be made less than 50°C. In addition, in the case of increasing the lowest furnace temperature, it is sufficient to output a signal to reduce the opening of the flow control valve 40. As a result, the difference in furnace temperature can be made less than 50°C.

[0089] Fig.10 This is a flowchart showing an example of the processing of the operating method of the vertical distillation furnace of this embodiment. Fig.10 , a process of detecting an operational abnormality of the vertical dry distillation furnace 10 based on the gas flow rate and eliminating the operational abnormality will be described. Fig.10 The illustrated flow starts when the input unit 54 receives an input from the operator to start control of the control device 50 .

[0090] First, the acquisition unit 60 acquires vibration data from the acceleration sensor 20 (step S101 ). This process is referred to as an acquisition step. The acquisition unit 60 outputs the acquired vibration data to the calculation unit 62 .

[0091] The calculation unit 62 converts the acquired vibration data into an effective value of acceleration, and calculates the flow rate of gas discharged from each exhaust port 16 using a regression equation representing the correspondence between the effective value of acceleration and the flow rate of gas (step S102 ). The calculation unit 62 outputs the calculated flow rate of gas to the determination unit 64 .

[0092] The determination unit 64 reads the flow rate range predetermined by the storage unit 58 from the storage unit 58. The determination unit 64 determines whether the flow rate of the gas obtained from the operation unit 62 is outside the predetermined flow rate range (step S103). When the flow rate of the gas obtained from the operation unit 62 is within the predetermined flow rate range (step S103: No), the determination unit 64 returns the process to step S101, and repeatedly executes the processes of step S101 and step S102 until the flow rate of the gas outside the predetermined flow rate range is obtained. On the other hand, when the flow rate of the gas is outside the predetermined flow rate range (step S103: Yes), the determination unit 64 determines that the operation of the vertical distillation furnace 10 is an operational abnormality, and detects the operational abnormality of the vertical distillation furnace 10 (step S104). The processes of steps S103 and S104 constitute a determination step.

[0093] The determination unit 64 adjusts the opening of the flow rate regulating valve 40 to adjust the flow rate of the gas discharged from the exhaust port 16 where the flow rate of the gas is outside the predetermined flow rate range (step S105 ). This process is an adjustment step.

[0094] The determination unit 64 determines whether the input unit 54 has received an input from the operator indicating that the control of the control device 50 has ended (step S106). When the input from the operator indicating that the control has ended has been received (step S106: Yes), the determination unit 64 ends the process of detecting an operational abnormality of the vertical dry distillation furnace 10 and eliminating the operational abnormality. On the other hand, when the input from the operator indicating that the control has ended has not been received (step S106: No), the determination unit 64 returns the process to step S101 and repeats the process starting from step S101. By repeating these processes, even if the operational abnormality cannot be eliminated by adjusting the gas flow rate once, the operational abnormality of the vertical dry distillation furnace 10 can be eliminated by repeating the process 2 to 3 times.

[0095] By executing such processing, the control device 50 can detect an operational abnormality caused by a breakdown in the ventilation balance in the vertical dry distillation furnace 10. Furthermore, the control device 50 can adjust the gas flow rate of the gas exhausted from the exhaust port 16 to eliminate the operational abnormality.

[0096] Fig.11 This is a flowchart showing another example of the processing of the method for operating the vertical dry distillation furnace according to the present embodiment. Fig.11 , a process of detecting an operational abnormality of the vertical dry distillation furnace 10 based on the gas flow rate and the temperature in the furnace and eliminating the operational abnormality will be described. Fig.11 The illustrated flow also starts on the condition that the input unit 54 receives an input from the operator to start control of the control device 50 .

[0097] First, the acquisition unit 60 acquires vibration data from the acceleration sensor 20 and temperature data from the temperature sensor 30 (step S201 ). This process is an acquisition step. The acquisition unit 60 outputs the acquired vibration data and temperature data to the calculation unit 62 .

[0098] The calculation unit 62 converts the acquired vibration data into an effective value of acceleration, and uses the effective value of acceleration and a regression equation representing the corresponding relationship between the effective value of acceleration and the flow rate of gas to calculate the flow rate of gas discharged from each exhaust port 16. In addition, the calculation unit 62 calculates the temperature difference using the acquired temperature data (step S202). The calculation unit 62 outputs the flow rate and temperature difference of gas to the determination unit 64.

[0099] The determination unit 64 reads the flow rate range predetermined by the storage unit 58 from the storage unit 58. The determination unit 64 determines whether the flow rate of the gas obtained from the calculation unit 62 is outside the predetermined flow rate range (step S203). When the flow rate of the gas is within the predetermined flow rate range (step S203: No), the determination unit 64 returns the process to step S201, and repeatedly executes the processes of step S201 and step S202 until the flow rate of the gas outside the predetermined flow rate range is obtained. On the other hand, when the flow rate of the gas is outside the predetermined flow rate range (step S203: Yes), the determination unit 64 proceeds to step S204.

[0100] The determination unit 64 determines whether the temperature difference obtained from the calculation unit 62 is 50° C. or more (step S204). When the temperature difference obtained from the calculation unit 62 is less than 50° C. (step S204: No), the determination unit 64 returns the process to step S201. On the other hand, when the temperature difference is 50° C. or more (step S204: Yes), the determination unit 64 determines that the operation of the vertical distillation furnace 10 is abnormal, and detects the abnormal operation of the vertical distillation furnace 10 (step S205). Fig.11 In the example shown, the processing of steps S203 to S205 serves as a determination step.

[0101] The determination unit 64 adjusts the opening of the flow control valve 40 , for example, adjusts the flow rate of the gas discharged from the exhaust port 16 provided at the same position in the width direction as the position of the temperature sensor 30 outputting the highest temperature data (step S206 ). This process is an adjustment step.

[0102] The determination unit 64 determines whether the input unit 54 has received an input from the operator to terminate the control of the control device 50 (step S207). When the input from the operator to terminate the control of the control device 50 has been received (step S207: Yes), the determination unit 64 terminates the process of detecting and eliminating the abnormal operation of the vertical retort furnace 10. On the other hand, when the input from the operator to terminate the control of the control device 50 has not been received (step S207: No), the determination unit 64 returns the process to step S201 and repeatedly executes the process from step S102.

[0103] By executing such processing, the control device 50 can detect an operational abnormality of the vertical dry distillation furnace 10 based on the criterion of an operational abnormality that may cause dry distillation failure, such as a furnace temperature difference of 50° C. or more in a horizontal cross section. In addition, the control device 50 can adjust the flow rate of the gas exhausted from the exhaust port 16 to eliminate the operational abnormality.

[0104] As described above, by using the vertical dry distillation furnace equipment 100 of the present embodiment, it is possible to detect an operational abnormality of the vertical dry distillation furnace 10 caused by a destruction of the ventilation balance in the furnace. In this way, if the operational abnormality of the vertical dry distillation furnace 10 can be detected, a countermeasure such as adjusting the flow control valve 40 to restore the ventilation balance in the furnace is taken, thereby suppressing the production of low-strength iron coke due to poor dry distillation, and also suppressing the heat generation and fire in the product hopper. In addition, the ventilation balance in the furnace can be restored without changing the heat input from the high-temperature tuyere 13 and the low-temperature tuyere 14, so that the appropriate manufacturing temperature can be maintained, and the deformation and cracking of the formed product can be suppressed.

[0105] In addition, in the vertical retort furnace equipment 100 of the present embodiment, the vertical retort furnace 10 having 8 high temperature tuyere 13, 8 low temperature tuyere 14, 8 exhaust tuyere 16, and 8 cooling tuyere 15 is used for description, but the present invention is not limited thereto. The vertical retort furnace 10 may not have the low temperature tuyere 14 and the cooling tuyere 15, and may have at least one high temperature tuyere 13, or may have at least two exhaust tuyere 16.

[0106] In addition, an example is shown in which the exhaust vents 16 are arranged at the same height and at equal intervals on the furnace wall 12a, but the invention is not limited thereto. The exhaust vents 16 may not be at the same height, and may not be at equal intervals. In this way, when the heights and intervals are different, the flow rate range for determining abnormal operation is different in each exhaust vent, so the flow rate of gas during normal operation and the flow rate of gas during abnormal operation are obtained in each exhaust vent 16, and the flow rate range for determining whether the operation is abnormal is predetermined for each exhaust vent 16.

[0107] In addition, in the present embodiment, an example of using the acceleration sensor 20 as the flow sensor is shown, but the present invention is not limited thereto. As the flow sensor, any flow sensor can be used as long as it can measure the flow rate of the gas discharged from the exhaust port 16. In addition, when the data output from the flow sensor is flow data, the calculation unit 62 directly outputs the flow data obtained from the acquisition unit 60 to the determination unit 64.

[0108] Example

[0109] In this embodiment, Figure 1 , Figure 2 Similarly, in the vertical retort 10 shown, eight thermocouple temperature sensors 30 are horizontally arranged at the same position near the exhaust ports 16. In addition, acceleration sensors 20 are provided at the eight exhaust ports 16 as flow rate estimation means, and flow rate regulating valves are provided as flow rate regulating devices.

[0110] Fig.12 is a graph showing the temperature changes in the furnaces of Unit A and Unit B. Fig.12 In the figure, the horizontal axis is time (hr) and the vertical axis is the furnace temperature (°C). Unit A is one of the four exhaust vents provided on the same furnace wall 12a, and unit B is another of the four exhaust vents. Fig.10 As shown, during the operation of the vertical retort furnace 10, the flow rate of the gas discharged from unit A decreases and the temperature in the furnace increases. After 9:00, the flow rate difference of the gas between unit A and unit B becomes outside the predetermined range, and the temperature difference in the furnace becomes 50°C. Therefore, the opening of the flow control valve provided in unit A is expanded to increase the flow rate of the gas discharged from unit A. As a result, the temperature in the furnace of unit A decreases, and the temperature difference in the furnace between unit A and unit B becomes smaller. As a result, the flow rate difference of the gas between unit A and unit B becomes within the predetermined range, and the temperature difference in the furnace is also less than 50°C, thereby eliminating the malfunction in the operation of the vertical retort furnace 10.

[0111] Description of Reference Numerals

[0112] 10 Vertical distillation furnace

[0113] 11 Loading port

[0114] 12. Retort furnace body

[0115] 13 High temperature vent

[0116] 14 Low temperature air outlet

[0117] 15 Cooling vents

[0118] 16 Air outlet

[0119] 17 Exhaust port

[0120] 19 Branches

[0121] 20 Accelerometer

[0122] 22 Amplifier

[0123] 24 HPF

[0124] 30 Temperature sensor

[0125] 40 Flow Control Valve

[0126] 50 Control device

[0127] 52 Control Department

[0128] 54 Input section

[0129] 56 Output

[0130] 58 Storage

[0131] 60 Acquisition

[0132] 62 Operation unit

[0133] 64 Judgment Department

[0134] 70 flow path

[0135] 72 Pressure Sensor

[0136] 74 Flow sensor

[0137] 76 Temperature Sensor

[0138] 100 Vertical distillation furnace equipment

Claims

1. A method for operating a vertical retorting furnace, wherein the vertical retorting furnace is used to manufacture iron coke, wherein: The vertical retort furnace has: Retort furnace body; One or more high-temperature tuyere for blowing high-temperature gas into the main body of the retort furnace; and Two or more exhaust tuyere are provided at different positions from the high temperature tuyere in the height direction and are used to exhaust the gas in the dry distillation furnace body. The two or more exhaust vents are arranged at the same height and at different positions in the width direction. The operating method of the vertical retort furnace comprises: an acquisition step of acquiring the flow rate of the gases respectively discharged from the exhaust ports; and The step of determining that an operation is abnormal when the flow rate acquired in the acquisition step is outside a predetermined flow rate range.

2. The method for operating a vertical retort furnace according to claim 1, wherein: In the acquisition step, the flow rate of the gas exhausted from each of the exhaust ports is acquired by measuring the vibration of each of the exhaust ports.

3. The operating method of the vertical retort furnace according to claim 2, wherein: In the acquisition step, the flow rate of the gas exhausted from each exhaust port is acquired based on the vibration after removing the frequency component of the vibration that becomes interference, The frequency component of the vibration that becomes the disturbance is determined by performing a principal component analysis on the frequency component of the vibration that becomes the disturbance in advance and obtaining the load of the principal component.

4. The method for operating a vertical retort furnace according to claim 3, wherein: The frequency component of the vibration that becomes the disturbance is determined by evaluating the existence ratio of the load amount of the main component being equal to or greater than a predetermined value for each frequency.

5. The method for operating a vertical retort furnace according to any one of claims 1 to 4, wherein: In the acquisition step, the furnace temperatures at two or more positions that are the same in the height direction and different in the width direction are further acquired, and when the difference between the furnace temperatures is equal to or greater than a predetermined temperature difference, it is determined that the operation is abnormal.

6. The method for operating a vertical retort furnace according to any one of claims 1 to 4, wherein: The method for operating the vertical dry distillation furnace further comprises an adjustment step of adjusting a flow rate of the gas exhausted from the exhaust port so that the flow rate is within a predetermined flow rate range when the operation is determined to be abnormal in the determination step.

7. The method for operating a vertical retort furnace according to claim 5, wherein: The method for operating the vertical dry distillation furnace further comprises an adjustment step of adjusting the flow rate of the gas exhausted from the exhaust port so that the temperature difference in the furnace is less than a predetermined temperature when the operation is determined to be abnormal in the determination step.

8. A method for producing iron coke, wherein: The method for operating a vertical dry distillation furnace according to claim 6 is used to operate a vertical dry distillation furnace to produce iron coke.

9. A method for producing iron coke, wherein: The method for operating a vertical dry distillation furnace according to claim 7 is used to operate a vertical dry distillation furnace to produce iron coke.

10. A vertical retorting furnace device for producing iron coke, wherein: The vertical retort furnace equipment comprises: Vertical retort furnace; Two or more flow sensors for measuring the flow of gas; and A control device controls the vertical retort furnace, The vertical retort furnace has: Retort furnace body; A loading port for loading the formed product as the raw material of iron coke; One or more high-temperature tuyere for blowing high-temperature gas into the main body of the retort furnace; Two or more exhaust tuyere ports are provided at different positions from the high-temperature tuyere ports in the height direction and are used to exhaust gas in the dry distillation furnace body; and The discharge port discharges the formed product after dry distillation. The two or more exhaust vents are arranged at different positions in the width direction. The two or more flow sensors are respectively arranged at the two or more air outlets. The control device has: an acquisition unit that acquires data indicating the flow rate of the gas exhausted from the exhaust port from the flow rate sensor; A calculation unit, which calculates the flow rate of the gas discharged from each exhaust port according to the data; and The determination unit determines that the operation is abnormal when the flow rate is outside a predetermined flow rate range.

11. The vertical retort furnace equipment according to claim 10, wherein: The flow sensor is a vibrating meter.

12. The vertical retort furnace equipment according to claim 11, wherein: The vertical retort furnace equipment also has an interference removal filter, The interference removal filter removes a predetermined frequency component from the vibration measured by the vibration meter.

13. The vertical retort furnace equipment according to claim 12, wherein: The frequency component is determined in advance by performing principal component analysis on the frequency component of the vibration that becomes disturbance and evaluating the existence ratio of the load amount of the principal component being equal to or greater than a predetermined value for each frequency.

14. The vertical retort furnace equipment according to any one of claims 10 to 13, wherein: The vertical retort furnace equipment also has two or more temperature sensors, which measure the temperature inside the furnace. The temperature sensors are disposed at two or more positions in the vertical distillation furnace at the same height and different in the width direction. The acquisition unit acquires the temperature in the furnace from each temperature sensor, and the determination unit determines that the operation is abnormal when a difference between the temperatures in the furnace acquired from each temperature sensor is equal to or larger than a predetermined temperature difference.

15. The vertical retort furnace equipment according to any one of claims 10 to 13, wherein: When the determination unit determines that the operation is abnormal, the determination unit adjusts the flow rate of the gas exhausted from the exhaust port so that the flow rate is within a predetermined flow rate range.

16. The vertical retort furnace equipment according to claim 14, wherein: When the determination unit determines that the operation is abnormal, the determination unit adjusts the flow rate of the gas exhausted from the exhaust port so that the difference in the temperature within the furnace becomes smaller than a predetermined temperature.

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