JP2018168292A - Method for determining abnormality in carbonization chamber of coke oven, and method for operating coke oven - Google Patents

Abstract

To provide a method of sensing the risk of the extrusion clogging of a carbonization chamber in advance.SOLUTION: Provided ia a method for determining an abnormality in a carbonization chamber of a coke oven characterized in that, upon extrusion of a coke(s) from a carbonization chamber, whether an evaluation value for evaluating the degree of an extrusion load being an abnormal state of being higher than a threshold value or being a normal state of being lower than the threshold value is determined, and, in the case the first actual value consisting of extrusion current and furnace wall temperature acquired in the abnormal state follows the first correlation between furnace wall temperature and extrusion current acquired in advance, it is determined that furnace wall temperature shall be increased in the following operation, and, in the case the second actual value consisting of the maximum value of extrusion current and the total carbonization time acquired in the abnormal state follows the second correlation between the maximum value of extrusion current and the total carbonization time acquired in advance, it is determined that the total carbonization time shall be prolonged in the following operation.SELECTED DRAWING: Figure 8

Description

The present invention relates to a method for determining an abnormal state in which the pushing load of a coking chamber of a coke oven increases.

  In a coke oven, coke is produced by subjecting raw coal charged in a coke oven carbonization chamber to carbonization by burning gas in an adjacent combustion chamber. In the coke oven carbonization chamber, carbon generated by pyrolysis of the dry distillation product gas and pulverized coal scattered at the time of charging the coal adhere to the furnace wall and coke, thereby generating carbon attached to the furnace wall. The carbon attached to the furnace wall lowers the thermal conductivity of the furnace wall as it grows on the furnace wall surface, and reduces the effective volume of the carbonization chamber, thereby reducing the productivity of the coke oven. Furthermore, the furnace wall adhering carbon increases the extruding load when extruding coke from the carbonization chamber, and if the amount of adhering carbon increases, it causes clogging that prevents coke from being extruded during extrusion. For this reason, it is required to predict the state of the carbon adhering to the furnace wall, detect the risk of clogging in advance, and remove the carbon adhering to the furnace wall in advance before the clogging occurs.

  In Patent Document 1, when the coke is discharged from the kiln, the extrusion load applied to the coke extruder for each kiln (carbonization chamber) is detected by converting it into a time integrated value of electric power or a time integrated value of electric current. A detection method is disclosed that compares with a reference value set for each kiln based on the history of the kiln and discriminates that carbon is excessively adhered when the detected value exceeds the reference value.

JP 59-53587 A

  However, even if the detected value exceeded the reference value, excessive carbon adhering to the furnace wall was not seen on the wall surface of the carbonization chamber, and the cause of the increase in the extrusion load was often not due to carbon adhesion. For this reason, in order to suppress the occurrence of clogging, a method for identifying the cause of an increase in the extrusion load has been demanded.

  In order to solve the above-mentioned problem, the abnormality determination method for a coke oven in a coke oven according to the present invention has an evaluation value that evaluates the degree of extrusion load when extruding coke that has been carbonized in the coke oven of a coke oven from a threshold value. A first step of determining whether the evaluation value is a normal state equal to or lower than the threshold value, and a first actual value consisting of the extrusion current and the furnace wall temperature acquired in the abnormal state If the predetermined first correlation between the furnace wall temperature acquired in advance and the extrusion current is followed, it is determined that the furnace wall temperature needs to be higher than the furnace wall temperature of the current operation in the next operation. 2 step, the second actual value consisting of the maximum value of the extrusion current and the total carbonization time acquired in the abnormal state is a predetermined first value of the maximum value of the extrusion current and the total carbonization time acquired in advance. In the third step of determining that the total carbonization time needs to be longer than the total carbonization time of the current operation in the next operation, and the second step, the first actual value Is not in accordance with the first correlation, and in the third step, the second actual value does not comply with the second correlation, it is necessary to inspect and maintain the carbonization chamber And a fourth step of determining.

  When the coke oven operating method according to the present invention extrudes coke carbonized in the coking chamber of the coke oven, the evaluation value for evaluating the degree of extrusion load is an abnormal state higher than a threshold value, or the evaluation value Is the normal state below the threshold value, and the first actual value consisting of the extrusion current and the furnace wall temperature acquired in the abnormal state is a predetermined first of the furnace wall temperature and the extrusion current acquired in advance. In the case of following the correlation, the furnace wall temperature is made higher than the furnace wall temperature of the current operation, the next coke oven operation is performed, and the maximum value of the extrusion current acquired in the abnormal state and the total carbonization time are included. When the second actual value is in accordance with the predetermined second correlation between the maximum value of the extrusion current acquired in advance and the total carbonization time, the total carbonization time is longer than the total carbonization time of the current operation. Then, the next coke oven operation is performed, the first actual value acquired in the abnormal state does not follow the first correlation, and the second actual value acquired in the abnormal state is the first When the correlation of 2 is not complied with, the carbonization chamber is inspected, the abnormality is solved, and the next coke oven operation is performed.

  According to the present invention, it is possible to identify the cause of the increase in the extrusion load, and it is possible to prevent clogging by executing an appropriate action according to the result.

It is a schematic plan view of a set of carbonization chamber and combustion chamber. It is a graph which shows the relationship between the position (horizontal axis) of the ram extending in the furnace length direction and the extrusion current (vertical axis). It is a graph which shows an example of the correlation of a furnace wall temperature and extrusion current. FIG. 4 is a graph corresponding to FIG. 3 in which the extrusion current and furnace wall temperature acquired at “position 27” in FIG. 2 are plotted. It is a graph which shows an example of the correlation of total carbonization time and extrusion current. 6 is a graph corresponding to FIG. 5 in which the total carbonization time and extrusion current obtained this time are plotted. It is a flowchart for demonstrating the abnormality determination method of the carbonization chamber of a coke oven. It is a graph which shows the data of the difference area which changes every day (Example 1). It is a graph which shows the relationship between the position (horizontal axis) of a ram, extrusion current (vertical axis), and furnace wall temperature (vertical axis) (Example 1). FIG. 5 is a graph in which actual data of maximum extrusion current and furnace wall temperature are plotted on the current / temperature correlation diagram at “position 25” (Example 1). It is the data after implementing the action which raises a furnace wall temperature, and is a graph corresponding to FIG. 9 (Example 1). It is a graph which shows the data of the difference area which changes every day (Example 2). It is a graph which shows the relationship between the position (horizontal axis) of a ram, and extrusion current (vertical axis) (Example 2). It is the graph which plotted the actual data of the maximum pushing current and the total carbonization time on the figure of the current-total carbonization time correlation (Example 2). It is the data after implementing the action which extends total carbonization time, and is a graph corresponding to FIG. 13 (Example 2). It is a graph which shows the data of the difference area which changes every day (Example 3). It is a graph which shows the relationship between the position (horizontal axis) of a ram, and extrusion current (vertical axis) (Example 3). It is data after implementing the action which removes adhering carbon, and is a graph corresponding to Drawing 16 (example 3).

  FIG. 1 is a schematic plan view of a set of carbonization chambers and a combustion chamber adjacent to the carbonization chamber. X axis, Y axis and Z axis are three axes orthogonal to each other, X axis corresponds to the furnace width direction of the coke oven, Y axis corresponds to the furnace length direction of the coke oven, Corresponds to the height direction of the coke oven. The white arrow shown in FIG. 1 indicates the direction of extrusion of the coke that has been carbonized.

  The carbonization chamber 10 and the combustion chamber 20 are alternately arranged in the furnace width direction (X-axis direction) through a furnace wall made of brick. A charging hole (not shown) is provided in the upper part of the carbonization chamber 10, and raw coal is charged from the charcoal vehicle into the carbonization chamber 10 through the charging hole. As the coking coal, blended coal composed of multiple brands of coal can be used.

  The combustion chamber 20 includes a plurality of small combustion chambers F. In the present embodiment, the combustion chamber 20 is configured by arranging the small combustion chambers F1 to F34 in the furnace length direction (Y-axis direction). There are various types of combustion structures of the combustion chamber 20 such as a two-split type and a hairpin type. For example, in a two-split coke oven, each small combustion chamber F is divided into two in the furnace length direction: a combustion side where combustion of fuel gas is performed and a withdrawal side where combustion exhaust gas is drawn down to the flue, The upper part of each small combustion chamber F is connected with the tunnel-like upper horizontal tunnel formed over the length direction of the coke oven. Combustion exhaust gas generated on the combustion side passes through the upper horizontal tunnel, passes through the withdrawal side, and is discharged to the flue. After such combustion for 20 to 30 minutes, the combustion side and the withdrawal side are switched to perform combustion.

  By controlling the flow rate of the combustion gas introduced into each small combustion chamber portion F, the temperature of the combustion chamber 20 can be controlled. By controlling the temperature of the combustion chamber 20, the temperature of the furnace wall of the carbonization chamber 10 is adjusted. The flow rate of the combustion gas can be controlled by a known method (for example, adjusting the opening of a valve that performs flow rate control).

  An extruder 40 is installed at the end of the carbonization chamber 10 on the small combustion chamber F34 side. The extruder 40 extends the extrusion ram 41 from the small combustion chamber F 34 side toward the small combustion chamber F 1 side, thereby extruding red hot coke produced by dry distillation of raw coal to the outside of the carbonization chamber 10. The red hot coke pushed out of the carbonization chamber 10 is conveyed by a guide car and cooled by a coke dry fire extinguishing equipment or the like.

  Temperature sensors are provided on both sides of the extrusion ram 41 to detect the furnace wall temperature when extruding red hot coke.

  The graph of FIG. 2 shows the relationship between the position (horizontal axis) of the extrusion ram 41 extending in the furnace length direction and the extrusion current (vertical axis) when red hot coke is extruded. The numbers on the horizontal axis correspond to the numbers of the small combustion chambers F1 to F34. For example, the extrusion current at “position 27” is the extrusion current when the extrusion ram 41 reaches the position corresponding to the small combustion chamber F27. It is shown. The graph plotted with triangle marks is current data during normal operation where the extrusion load is not excessively high (hereinafter referred to as the reference current), and the graph plotted with square marks is current data acquired in any operation scene. (Hereinafter referred to as the actual current). Here, the reference current can be set by extracting the one having a low extrusion load from the past operation data for a certain period, for example, one month, and taking the average value.

  The difference value between the reference current and the actual current when the push-out ram 41 extends from the position corresponding to the small combustion chamber F34 to the position corresponding to the small combustion chamber F1, in other words, the reference current graph and the actual current graph. If the difference area (corresponding to the evaluation value in the claims) of the region indicated by the sandwiched hatching exceeds the difference threshold value, it is determined that clogging may occur at the next extrusion. On the other hand, if the difference area is equal to or less than the difference threshold, it is determined that clogging has not yet occurred. The difference threshold value can be appropriately set based on the past operation results, more specifically, based on the difference value between the actual current and the reference current at the time of the previous extrusion when clogging occurred.

  However, the evaluation value is not limited to the difference area. For example, the average value of the actual current when the extrusion ram 41 is extended from the position corresponding to the small combustion chamber F34 to the position corresponding to the small combustion chamber F1 may be used as the evaluation value. When this average value exceeds a predetermined threshold value, it is determined that there is a possibility that clogging may occur at the next extrusion. The maximum value of the actual current may be used as the evaluation value. If this maximum value exceeds a predetermined threshold value, it is determined that there is a risk of clogging at the next extrusion.

  If the extrusion load is increased due to the furnace wall adhering carbon adhering to the furnace wall, the action of removing the excessively adhering carbon can be implemented to reduce the extrusion load and prevent clogging. it can. On the other hand, when the carbon adhering to the furnace wall is not the cause, it is necessary to investigate other causes and take action according to the investigation result.

  The present inventor investigated factors other than the furnace wall-attached carbon that affect the increase in the extrusion load, and found that the influence of the furnace wall temperature and the total carbonization time is large. The graph of FIG. 3 shows the extrusion current and furnace wall temperature data at the time of red hot coke extrusion at the “position 27” of the carbonization chamber that obtained the result of FIG. 2, the vertical axis represents the extrusion current, and the horizontal axis represents the furnace wall temperature. And plotted. The unit of extrusion current is “A”, and the unit of furnace wall temperature is “° C.”. The furnace wall temperature at “position 27” can be detected by the temperature sensor of the extrusion ram 41.

  The data plotted in the graph of FIG. 3 is not so much that carbon adhering to the furnace wall affects the extrusion load, and the total carbonization time is within a predetermined range, and there is a predetermined correlation between the furnace wall temperature and the extrusion current. (Hereinafter, it may be referred to as a current-temperature correlation). That is, it can be seen that there is a negative correlation in which the extrusion current increases as the furnace wall temperature decreases. The inventor has confirmed that there is a similar correlation at positions other than “position 27”.

  Here, the actual value data (corresponding to the first actual value in the claims) of the furnace wall temperature at the position where the maximum value and the maximum value of the push-out current when the difference area exceeds the difference threshold are When the current-temperature correlation is followed, it is determined that the extrusion load is high due to the low furnace wall temperature. On the other hand, when the current / temperature correlation is not followed, it is determined that the pushing load is high due to factors other than the furnace wall temperature. Here, the case where the performance data is plotted in the distribution area of the data acquired in advance (for example, the area surrounded by the broken line in FIG. 3) is regarded as following the current-temperature correlation.

  FIG. 4 is a graph of the current / temperature correlation at “position 27” shown in FIG. 3 in which the actual data of the extrusion current and the furnace wall temperature obtained at “position 27” in FIG. . “Position 27” has the largest pushing current among “Positions 1 to 34”. Since the data of “position 27” does not follow the above-described current-temperature correlation, it is considered that the pushing load is high due to factors other than the furnace wall temperature.

  Here, since the position where the extrusion current becomes maximum is not limited to “position 27”, it is desirable that the current / temperature correlation be obtained in advance for each “position 1 to 34” of each carbonization chamber 10. At least based on past operation results, the current / temperature correlation at the position where the extrusion current has reached the maximum is obtained.

  The present inventor has also found that there is a correlation (corresponding to the second correlation in the claims) between the maximum value of the extrusion current and the total carbonization time. The graph of FIG. 5 shows actual data of the maximum value of the extrusion current when extruding red coke in a carbonization chamber and the total carbonization time of the carbonization chamber at that time. This is a plot of carbonization time. The unit of total carbonization time is “min”. From the graph of FIG. 5, it can be seen that the maximum value of the extrusion current and the total carbonization time change according to a predetermined correlation (hereinafter, sometimes referred to as a current / total carbonization time correlation).

  Here, when the difference area exceeds the difference threshold value, the maximum value of the push-out current and the actual data of the total carbonization time (corresponding to the second actual value of the claims) are in the above-mentioned current / total carbonization time correlation. If so, it is determined that the extrusion load is excessively high due to the short total carbonization time. On the other hand, if the current / total carbonization time correlation is not followed, it is determined that the extrusion load is high due to factors other than the total carbonization time. Here, the case where the actual data is plotted in the distribution area of the data acquired in advance (for example, the area surrounded by the broken line in FIG. 5) is regarded as following the current / total carbonization time correlation. The current / total carbonization time correlation is obtained in advance for each carbonization chamber 10.

  Here, the total carbonization time is determined from the sum of the burning time and the setting time. The burn-out time is the time from when coal is charged into the coke oven until it is considered that the dry distillation has been completed. The setting time is the time from the end of dry distillation until the coke is pushed out.

  The graph of FIG. 6 is a graph of the relationship between the current and total carbonization time of the carbonization chamber shown in FIG. The maximum values of total carbonization time and extrusion current obtained this time do not follow the above-mentioned current / total carbonization time correlation, and it is considered that the extrusion load increased due to factors other than the total carbonization time.

  Next, an abnormality determination method for the coking chamber of the coke oven will be described with reference to the flowchart of FIG. In S101, the extrusion current and furnace wall temperature when the extrusion ram 41 of the extruder 40 is extended from the position corresponding to the small combustion chamber F34 to the position corresponding to the small combustion chamber F1 in the carbonization chamber where the red hot coke is extruded. , Acquired at respective positions corresponding to the small combustion chambers F1 to F34. Moreover, the total carbonization time of the carbonization chamber is acquired.

  In S102, a graph of the actual current acquired in S101 (for example, a graph indicated by a square mark in FIG. 2) and a graph of a reference current obtained in advance during normal operation (for example, a graph indicated by a triangular mark in FIG. 2). In contrast, the difference area of these graphs (for example, the area of the area shown by hatching in FIG. 2) is obtained, and whether or not the difference area exceeds the difference threshold is determined.

  If the difference area does not exceed the difference threshold (No in step S102), the process proceeds to step S103. In step S103, it is determined that the coke oven is operating normally because no current increase has occurred due to an increase in the pushing load.

  If the difference area exceeds the difference threshold (Yes in step S102), the process proceeds to step S104. In step S104, the maximum extrusion current having the largest current value among the extrusion currents acquired at each ram position and the furnace wall temperature at the ram position where the maximum extrusion current is detected are extracted, and these maximum extrusion current and furnace wall temperature are Then, it is determined whether or not the current-temperature correlation (for example, correlation information shown in FIG. 3) prepared in advance is followed. Since the current / temperature correlation has been described above, the description thereof will not be repeated.

  If the maximum extrusion current and the furnace wall temperature are in accordance with the current / temperature correlation prepared in advance (Yes in step S104), the process proceeds to step S105. When the maximum extrusion current and the furnace wall temperature do not conform to the current / temperature correlation prepared in advance (No in step S104), the process proceeds to step S106.

  In step S105, a process for reflecting that the action to increase the furnace wall temperature is necessary in the next operation condition is performed. Specifically, it is possible to reflect in the next operation by recording in the database that the opening degree of the valve that controls the flow rate of the combustion gas needs to be larger than that at the previous operation. When the opening of the valve increases, the flow rate of the combustion gas flowing into the combustion chamber 20 increases, so that the furnace wall temperature can be raised. That is, in the next operation, an action for raising the furnace wall temperature from the current furnace wall temperature is performed.

  In step S106, the total carbonization time and the maximum extrusion current are extracted, and the total carbonization time and the maximum extrusion current are determined according to the current-total carbonization time correlation prepared in advance (for example, correlation information shown in FIG. 5). It is determined whether or not. Since the current / total carbonization time correlation has been described above, the description thereof will not be repeated.

  If the total carbonization time and the maximum push-out current are in accordance with the current-total carbonization time correlation prepared in advance (Yes in step S106), the process proceeds to step S107. On the other hand, when the total carbonization time and the maximum pushing current do not comply with the current-total carbonization time correlation prepared in advance (No in step S106), the process proceeds to step S108.

  In step S107, a process for reflecting that the action for extending the total carbonization time is required in the next operation condition is performed. In other words, in the next operation, an action to make the total carbonization time longer than the current operation is performed.

  In step S108, since the extrusion load may have increased due to the deterioration of the furnace wall condition (for example, the above-described excessive adhesion of the furnace wall-attached carbon), a process for promoting furnace wall inspection and maintenance is performed. Here, as a method of removing excessive carbon adhesion, a method of mechanically removing the furnace wall adhesion carbon and a method of burning and removing the furnace wall adhesion carbon by blowing air into the combustion chamber 20 are conceivable.

  In the above flowchart, the process of determining whether the current / temperature correlation is being followed (the process of step S104) is performed before the process of determining whether the current / total carbonization time correlation is being followed (the process of step S106). However, these processing orders may be reversed. In this case, if it is determined that the current / total carbonization time correlation is not followed, it is determined whether or not the current / temperature correlation is followed. If the current / temperature correlation is not followed, a process for prompting furnace wall inspection and maintenance (process shown in step S108) is executed.

  The process shown in the flowchart is performed for each carbonization chamber.

The present invention will be specifically described with reference to examples.
Example 1
The data corresponding to FIG. 2 was acquired in the actual furnace, the difference area for each day was obtained, and the graph of FIG. 8 was obtained. The alternate long and short dash line indicates the difference threshold value. The data described as “Before Action” shows that the difference area exceeds the difference threshold, and the relationship between the ram position (horizontal axis), the extrusion current (vertical axis), and the furnace wall temperature (vertical axis) This is shown in the graph of FIG. The maximum extrusion current having the largest current value among the extrusion currents acquired at each ram position and the furnace wall temperature at the ram position “position 25” where the maximum extrusion current is detected are extracted, and the current at “position 25” acquired in advance is extracted. -Plotted with crosses in the temperature correlation diagram. As a result, as shown in FIG. 10, it was found that the current-temperature correlation at “position 25” was followed, and it was determined that the furnace wall temperature was low as the cause of the increase in the extrusion load. Based on this result, the actual current value and the furnace wall temperature at each ram position at the time of extrusion after performing the action of increasing the furnace wall temperature are shown in FIG. When the difference area exceeds the difference threshold and the current / temperature correlation is followed, an action to increase the furnace wall temperature is performed, the difference area falls below the difference threshold, and the reference current and actual results The difference in current became smaller.

(Example 2)
The data corresponding to FIG. 2 was acquired in the actual furnace, the difference area for each day was obtained, and the graph of FIG. 12 was obtained. The alternate long and short dash line indicates the difference threshold value. In the data described as “Before Action”, the difference area exceeds the difference threshold, and the relationship between the ram position (horizontal axis) and the pushing current (vertical axis) at this time is shown in the graph of FIG. The maximum extrusion current having the largest current value among the extrusion currents acquired at each ram position and the furnace wall temperature at the ram position “position 25” where the maximum extrusion current is detected are extracted, and the current at “position 25” acquired in advance is extracted.・ Plotted in the temperature correlation diagram, but did not follow the current-temperature correlation. Therefore, the extrusion current value at “position 25” and the actual value of the total carbonization time of the carbonization chamber were plotted with crosses in the current / total carbonization time correlation diagram. As a result, it was found that the current-temperature correlation was observed as shown in FIG. 14, and the short total carbonization time was determined to be the cause of the increase in the extrusion load. Based on this result, the actual current value at each ram position during extrusion after the action of extending the total carbonization time from 1194 (min) to 1361 (min) is shown in FIG. When the difference area exceeds the difference threshold value and the current / total carbonization time correlation is followed, by performing an action to increase the total carbonization time, the difference area decreases below the difference threshold value, and the reference current and The difference in actual current has become smaller.

(Example 3)
The data corresponding to FIG. 2 was acquired in the actual furnace, the difference area for each day was obtained, and the graph of FIG. 16 was obtained. The alternate long and short dash line indicates the difference threshold value. In the data described as “Before Action”, the difference area exceeds the difference threshold, and the relationship between the ram position (horizontal axis) and the extrusion current (vertical axis) at this time is shown in the graph of FIG. Although not shown, neither the current / temperature correlation nor the current / total carbonization time correlation was observed, so the coke oven was inspected to confirm that carbon was thickly attached to the furnace wall of the carbonization chamber. did. Therefore, an action for removing carbon adhering thickly was performed, and the results shown in the graph of FIG. 18 were obtained. As shown in FIGS. 16 to 18, when the difference area exceeds the difference threshold and neither the current-temperature correlation nor the current-total carbonization time correlation is obeyed, It was confirmed that the thickness was excessive, and by carrying out an action to reduce the thickness of the attached carbon, the difference area decreased below the difference threshold, and the difference between the reference current and the actual current was reduced.

DESCRIPTION OF SYMBOLS 10 Carbonization chamber 20 Combustion chamber F1-F34 Small combustion chamber 40 Extruder 41 Extrusion ram

Claims (4)

When extruding coke that has been carbonized in a coking chamber of a coke oven, whether the evaluation value for evaluating the degree of extrusion load is an abnormal state higher than a threshold value, or whether the evaluation value is a normal state below the threshold value. A first step of determining;
If the first actual value consisting of the extrusion current and the furnace wall temperature acquired in the abnormal state is in accordance with a predetermined first correlation between the furnace wall temperature and the extrusion current acquired in advance, this time in the next operation A second step for determining that the furnace wall temperature needs to be higher than the furnace wall temperature of the operation;
When the second actual value composed of the maximum value of the extrusion current and the total carbonization time acquired in the abnormal state is in accordance with a predetermined second correlation between the maximum value of the extrusion current acquired in advance and the total carbonization time. The third step of determining that the total carbonization time needs to be longer than the total carbonization time of the current operation in the next operation,
In the second step, when the first actual value does not conform to the first correlation, and in the third step, the second actual value does not conform to the second correlation. A fourth step for determining that the carbonization chamber needs to be inspected and maintained;
An abnormality determination method for a coking chamber of a coke oven, comprising: A combustion chamber in which a plurality of small combustion chambers are arranged in the furnace length direction is provided adjacent to the furnace width direction of the carbonization chamber,
In the first step, each extrusion current and each furnace wall temperature when the ram of the extruder reaches a position corresponding to each small combustion chamber is acquired,
The first actual value consists of the extrusion current and the furnace wall temperature acquired at the maximum current position where the current is the largest among the extrusion currents acquired in the first step,
2. The coke chamber abnormality determination method according to claim 1, wherein the first correlation is obtained from a plurality of performance data acquired at the maximum current position.   3. The coking chamber of the coke oven according to claim 1, wherein the third step is performed when the first actual value does not conform to the first correlation in the second step. 4. Abnormality judgment method. When extruding coke that has been carbonized in a coking chamber of a coke oven, whether the evaluation value for evaluating the degree of extrusion load is an abnormal state higher than a threshold value, or whether the evaluation value is a normal state below the threshold value. Judgment,
If the first actual value consisting of the extrusion current and the furnace wall temperature acquired in the abnormal state is in accordance with a predetermined first correlation between the furnace wall temperature and the extrusion current acquired in advance, the furnace of the current operation Perform the next coke oven operation with the furnace wall temperature higher than the wall temperature,
When the second actual value composed of the maximum value of the extrusion current and the total carbonization time acquired in the abnormal state is in accordance with a predetermined second correlation between the maximum value of the extrusion current acquired in advance and the total carbonization time. The next coke oven operation is performed with a longer total carbonization time than the total carbonization time for this operation.
When the first actual value acquired in the abnormal state does not conform to the first correlation, and the second actual value acquired in the abnormal state does not conform to the second correlation Inspecting the carbonization chamber to resolve the abnormality and start the next coke oven operation.
A method for operating a coke oven characterized by the above.