JP3604747B2 - Coke oven carbonization chamber wall abnormality judgment method - Google Patents

Description

[0001]
[Industrial applications]
The present invention relates to a method for determining wall surface abnormality of a coking chamber in a coke oven for producing coke by subjecting raw coal having a required brand-specific blend to dry distillation in a coking chamber.
[0002]
[Prior art]
In general, the operation of this type of coke oven, that is, a coke oven in which a number of coking chambers (kilns) for carbonizing coking coal are arranged side by side in the furnace length direction to build a fireproof construction, has been well known. First, using a charging car, first, coking coal with a required blend is charged into a carbonization chamber, and carbonization of the coking coal is performed as expected, and then, after completion of the carbonization, By driving the extrusion ram of the extruder to gradually extrude the coking cake, that is, the so-called coke cake, which has been dry-distilled in the coking chamber, from one kiln end side to the other kiln end side, the coke cake is guided through a guide wheel. The coke cake was transferred onto the fire extinguishing car, and then the coke cake transferred on the fire extinguishing car was extinguished to obtain the desired coke.In each of the carbonization chambers constituting the coke oven, Coking coal from vehicles charged Charged, dry distillation process of the raw material coal, the operation of extrusion of the carbonization treated coke cake by extruder are respectively repeatedly performed every predetermined carbonization cycles.
[0003]
Thus, in the carbonization chamber, due to the carbonization of the coking coal which is repeated many times in each of the predetermined carbonization cycles, the refractory wall surface forming the carbonization chamber is damaged or the like. Roughening of the wall surface, so-called roughening of the surface, or carbon deposition on the wall surface reduces the carbonization function of the carbonization chamber itself. is there.
[0004]
Therefore, in the conventional case, when the former refractory wall surface becomes rough, the corresponding portion of the refractory wall surface is repaired, and when the latter refractory wall surface causes carbon adhesion, the adhered carbon is newly incinerated. On the other hand, detection of functional deterioration such as roughening of the wall surfaces and carbon adhesion in the carbonization chamber is usually performed when the coke cake is extruded by the extrusion ram of the extruder. The variation of the extrusion load is monitored, that is, here, by observing and monitoring the transition of the power consumption of the ram drive motor that is the driving source of the extrusion ram, the state of the carbonization chamber is totally monitored. I try to figure it out.
[0005]
[Problems to be solved by the invention]
However, in the above-described conventional method for detecting a rough surface on the carbonization chamber wall surface and a decrease in the dry distillation function such as carbon adhesion, even if it is possible to detect a general decrease in the function of the carbonization chamber, specific skin roughness and carbon adhesion And the like, it is relatively difficult to take appropriate measures per se, and in the related art, the worker has been required to perform the carbonization function based on the transition of the power consumption of the ram drive motor. The current situation is to judge the decline empirically and take corresponding measures.
[0006]
In addition, the power consumption of the ram drive motor obtained by the conventional detection method is merely a power corresponding to a change in power during an elapsed time from the start to the end of extruding coke cake in the extruder. However, since the power required to drive the extrusion ram is not only affected by the surface roughness of the refractory wall, carbon adhesion, etc., it is not always possible to make an accurate judgment only by examining the transition of the power consumption. There was no problem.
[0007]
The present invention has been made in view of such a conventional situation, and has been made in order to solve these problems. The purpose of the present invention is to provide a coke oven with a carbonized room having a refractory wall having a rough surface, such as abnormalities such as carbon adhesion. To provide an abnormality determination method for a wall of a coke oven carbonization chamber in which occurrence can be confirmed at an early stage so that appropriate measures can be taken and thereby the carbonization function of the carbonization chamber can always be maintained in a good state. That is.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, a method for diagnosing an abnormality in the wall of a coke oven carbonization chamber according to the present invention comprises charging coking coal having a required brand-specific blend into a coke oven (kiln) of a coke oven, and After the coking cake is obtained by subjecting the raw coal to dry distillation to obtain a coke cake, the coke cake is extruded (extruded from the kiln). When operating the method, it is a method of analyzing the variation of the kiln discharge resistance loaded on the extrusion ram, to determine the abnormality of the carbonization chamber wall surface, for each carbonization process cycle of the raw coal in the carbonization chamber And fluctuation detection data for detecting and collecting the fluctuation of the kiln discharge resistance as a transition of the power consumption of the ram drive motor over the entire kiln discharge elapse time from the start of the discharge of the coke cake by the extrusion ram to the end of the discharge of the coke cake. Excessive collection And for the fluctuation detection data of the power consumption including the kiln discharge elapsed time for each carbonization processing cycle collected in the fluctuation detection data collection process, for each of the corresponding carbonization processing cycles, After correcting by adding changes in dry distillation conditions such as the properties of coking coal, gross caulking time, firing temperature, and power output from the kiln related to the fluctuation, these were sequentially stored in the storage device together with the elapsed time from the kiln. Accumulating and producing a carbonization result database based on the fluctuation detection data of the power consumption including the elapse time of the kiln discharge, and at least the extrusion among the carbonization result data obtained in the carbonization result database creation process. When the coke cake is discharged by the extrusion ram of the machine, the resistance to the discharge of the coke appears most prominently from the beginning of the coke compression at the beginning of the discharge of the coke The process of setting the actual carbonization actual data comparison range, which takes out and partially sets the specific kiln discharge operation time centered around the start time of the relocation of the furnace, and the specific kiln discharge operation time range set in the carbonization actual data comparison range setting process Of the past average power consumption calculated from each of the carbonization results data of at least two or more carbonization treatment cycles, and the transition of the latest power consumption of the latest carbonization treatment cycle within the applicable operation time range, or within the applicable operation time range Of the latest average power consumption calculated from each of the carbonization results data of several carbonization processing cycles immediately before and after the latest in each of the carbonization processing cycles, as a power waveform or a graphed power waveform, the carbonization results to be displayed on the screen of the display device Displaying a power waveform or a graphed power waveform on a screen of the display device. Both the transition of the past average power consumption within the specified kiln operating time range and the transition of the latest power consumption within the applicable operation time range, or the transition of the latest average power consumption within the applicable operation time range. It is characterized by comparing and analyzing and determining the abnormality of the carbonization chamber wall surface based on the difference between these two power consumptions.
[0009]
[Action]
Therefore, in the method of the present invention, each carbonization result is managed in accordance with the carbonization process of the charged coking coal which is repeatedly performed in each carbonization chamber (kiln) of the coke oven, and each carbonization process cycle is controlled. In response to fluctuations in power consumption including the elapse time of kiln discharge by the extrusion ram of the extruder, changes in carbonization conditions such as properties of coking coal, gross coking time, firing temperature, and kiln discharge power value related to the fluctuations. In addition, the corrected fluctuation data is detected, and among the respective carbonization results data created based on the detected fluctuation data, at least from the vicinity of the start of coke compression at the beginning of the coke discharge from the kiln by the extrusion ram to the vicinity of the start of coke movement. Changes in past average power consumption calculated from each carbonization result data of at least multiple carbonization treatment cycles within the specific kiln discharge operation time range centered on Between the latest power consumption of the latest carbonization processing cycle within the time range, and the latest average power consumption calculated from each carbonization result data of the latest several times of the carbonization processing cycle within the applicable operation time range. By performing comparative analysis on the screen of the display device, the wall surface abnormality of the carbonization chamber is determined.
[0010]
【Example】
Hereinafter, an embodiment of a method for determining an abnormality in a coke oven carbonization chamber wall surface according to the present invention will be described in detail with reference to FIGS.
[0011]
FIG. 1 is a cross-sectional view schematically showing the outline of a coke oven facility to which one embodiment of the present invention is applied, as viewed from the side, and FIG. 2 is an embodiment of the present invention. FIG. 3 is a block diagram showing an overview of a method of determining an abnormality in a wall of a coke oven carbonization chamber, and FIG. 3 is a block diagram showing a flow from collection to analysis of each dry distillation result data in the method of determining an abnormality of the wall of a coke oven carbonization chamber. is there.
[0012]
First, in the coke oven facility shown in FIG. 1, the coke oven 10 is configured by refractory construction of a large number of coking chambers (kilns) 11 to be determined by the method of the present embodiment in a state of being juxtaposed in the furnace length direction. In addition, for each of the carbonization chambers 11, each of the incidental facilities that can be controlled and run on each of the rails (not shown) laid perpendicularly to the direction in which the carbonization chambers are laid, that is, in this case, A charging vehicle 12, an extruder 13 which is a core of application of the method of the present embodiment, a guide vehicle 14, and a fire extinguishing vehicle 15 are arranged.
[0013]
Here, the charging vehicle 12 is disposed so as to be able to control and run by connecting a series of upper sides of the respective coking chambers 11 constituting the coke oven. In a known manner, raw coal having a required blending is charged, and in each of the carbonization chambers 11, the raw coal charged therein is subjected to dry distillation as expected.
[0014]
Further, the extruder 13 is arranged so as to be able to control-run by connecting one kiln end 11a side of each of the carbonization chambers 11 in series, and the extruder ram 13b driven and controlled by a ram drive motor 13a is provided. The coke cake subjected to the dry distillation in each of the carbonization chambers 11 is extruded from one kiln end 11a to the other kiln end 11b by the extrusion operation of the extrusion ram 13b.
[0015]
Further, the guide wheel 14 and the fire extinguisher 15 are sequentially arranged such that the other kiln end 11b side of each of the carbonization chambers 11 is connected in series so that each can be controlled and run. The coke cake extruded by the extrusion ram 13b is guided by a guide wheel 14 and transferred onto a fire extinguishing car 15, and thereafter, the coke cake transferred onto the fire extinguishing car 15 is subjected to a fire extinguishing process in a known manner. To produce the desired coke.
[0016]
The method of the present embodiment is applied to the coke oven facility having the above-described configuration, as described above, and is used to detect an abnormality in the refractory wall of each coking chamber 11 so as to detect an abnormality in one of the kiln ends of the coking chamber 11. When the extrusion ram 13b of the extruder 13 is operated from the 11a side to the other kiln end 11b side, the fluctuation of the kiln discharge resistance loaded on the extrusion ram 13b is changed by the electric power of the ram drive motor 13a. Data is detected based on fluctuations in the consumption amount (hereinafter, also simply referred to as electric power supplied to the kiln), and is analyzed and determined from the detected fluctuation data.
[0017]
Subsequently, an example of detection of variation data of the power consumption in the ram drive motor 13a and an example of a means for determining an abnormality in the refractory wall of the coking chamber 11 by analyzing the variation data will be described in detail.
[0018]
Referring to FIG. 2 to FIG. 4, in this example, the respective systems of data collection, analysis, and integration of the power consumption for starting the kiln are configured and operated as follows.
[0019]
First, as shown in FIG. 2, for each carbonization cycle, the variation of the kiln resistance of the coke (coke cake) by the extrusion ram 13 b is changed from the start to the end of the ram drive motor 13 a to the kiln end. Measure and collect by power consumption data up to. That is, here, the ram power consumption measurement 21 when the coke oven is taken out, and the power consumption collection 22 at that time.
[0020]
Then, the power consumption collection 22 sets and executes the first personal computer (personal computer) 23 mounted on the extruder 13 in the collection mode, and activates the intended data collection system A.
[0021]
In this case, FIG. 4A shows an example of the kiln-starting power consumption obtained in the above-described manner, in other words, an average power integrated value (total area data) of the entire power waveform from the start to the end of data collection. As shown in the figure, the electric power waveform a can be used to confirm the resistance of the entire potting operation.
[0022]
Accordingly, here, in the kiln discharging operation, the value of the extrusion load of the extrusion ram 13b corresponds to the extrusion load applied to the ram drive motor 13a, which is consumed from the start of the coke cake extrusion to the end of the extrusion. The power consumption data collected over the entire elapsed time of the kiln discharge operation is input to the first personal computer 23 and stored on the HD (hard disk) of the storage device, and if necessary, the FD (Floppy disk).
[0023]
Here, regarding the collection of the power consumption data, in this case, for example, data corresponding to 60 carbonization cycles for each carbonization chamber 11, in other words, data corresponding to the latest 60 times in the past, is used. The power consumption data that is stored and accumulated, and that exceeds the 60 carbonization cycles, is updated successively while keeping the latest information.
[0024]
Further, when the coke cake is extruded by the extrusion ram 13b, as shown in the power waveform a of FIG. 4A, and eventually, as shown in FIG. The operation time within a specific range (generally from about 5 seconds to about 15 seconds after the start of the compression) b around the start of the movement of the coke cake from the start of the compression of the coke cake most significantly condenses the extrusion resistance. Since the magnitude of the resistance value in the specific range b clearly represents the presence of the wall abnormality of the carbonization chamber, the integrated average value of the power consumption at this time, that is, Calculate and collect the average power consumption value during the specific operation time.
[0025]
Further, as shown in FIG. 4 (c), regarding the integrated average value of the power consumption in the range c from the point after the specific range b to the end of the extrusion, the transition of the extrusion resistance due to the rough surface of the wall of the carbonization chamber is shown. Will be represented.
[0026]
Therefore, the influence of changes in the properties of raw coal, GCT (gross coking time), firing temperature, power consumption from the kiln, etc. is considered for each average power consumption value obtained as described above, as described later. Is corrected using the reference value thus obtained, and the transition of the corrected average power consumption integrated value is compared with the transition of the reference average power consumption integrated value predetermined for each coking chamber 11 to thereby calculate the coking chamber 11. The transition of the frictional resistance between the refractory wall and the coke cake can be found for each carbonization cycle.
[0027]
On the other hand, if the relationship between the furnace length direction position of the coking chamber 11 and the operation position of the extrusion ram 13b is considered in advance so that it can be grasped in advance as position data, the abnormal occurrence position on the wall of the coking chamber is also confirmed. It is possible to easily apply this to the guidelines for repair on the wall of the carbonization chamber and to search for the exact repair position, and furthermore, by using the collected data of the latest 60 carbonization treatment cycles described above, If the overwriting display process is enabled, the repair effect after the repair can be clearly and easily confirmed by overwriting the power waveforms before and after the repair.
[0028]
Therefore, from this, it is possible to grasp the progress of deterioration on the carbonization chamber wall surface of each of the carbonization chambers 11 and the state of adhesion of carbon. You can plan the time of incineration effectively.
[0029]
In addition, an increase in the extrusion resistance due to the narrowing of the room due to the adhesion of carbon to the carbonization chamber wall surface leads, in part, to an increase in the power waveform. It is clear that the adhesion state can be easily known. Here, similarly to the above, the relationship between the furnace length direction position of the carbonization chamber 11 and the operation position of the extrusion ram 13b can be grasped in advance as position data. By doing so, the degree of adhesion of carbon on the carbonization chamber wall surface, the adhesion position, and the like can be confirmed, and accurate carbon incineration can be achieved, and the confirmation after carbon incineration can be performed before and after incineration. By overwriting the waveform, the effect of incineration can be clearly and easily confirmed.
[0030]
Here, for displaying the power consumption data, for example, without using a high-speed chart or the like, by switching from the data collection mode to the data analysis mode on the personal computer body side as described later, It is preferable to display a predetermined type of display selected from several types of preset displays on a CRT according to the analysis purpose.
[0031]
As will be described later, by transferring the collected data stored on the HD of the first personal computer 23, the collected data can be called and analyzed at any time and at any place using the same kind of personal computer. It is also possible to connect a predetermined printer to the personal computer and output each display data individually. Further, for example, required partial data using FD (for example, each carbonization chamber ( True power consumption with corrections for changes in the properties of raw coal, GCT, firing temperature, power output from the kiln, etc. Calculate the amount to enable quantitative and aging data file management.
[0032]
Next, the power consumption data for each carbonization processing cycle collected in the data collection system A is sent to the data analysis system B and the data accumulation system C at the next stage.
[0033]
First, in the former data analysis system B, the first personal computer 23 mounted on the extruder 13 and / or the second personal computer 24 installed in a management office or the like as appropriate are set to an analysis mode, While receiving the kiln output power consumption data for each of the carbonization treatment cycles, the first personal computer 23 and / or the second personal computer 25 use the first personal computer 23 and / or the second personal computer 25 to graph the transition of the kiln output power and integrate the kiln output power, for example. By performing each analysis such as a graph of the transition of the average value and a graph of the integrated power output value of the kiln, the occurrence of wall surface abnormality of each target carbonization chamber 11, that is, the rough surface of the wall surface, the adhesion of carbon, etc. judge.
[0034]
Further, in the data analysis system B, in the graphing of the power transition and the like, the transition of the power consumption of each kiln for each of the carbonization chambers 11 and each of the carbonization treatment cycles is represented by a power waveform along with the elapsed time of extrusion. By displaying as, the transition of the frictional resistance between the coke cake and the wall of the carbonization chamber is expressed by the transition of the electric power waveform, so that it is easy to search for the occurrence of abnormalities such as rough surface of the wall of the carbonization chamber and carbon adhesion. You can do it.
[0035]
Further, in the graphing of the average integrated power consumption value in the data analysis system, the average consumption calculated after the correction based on the raw coal properties, the GCT, the firing temperature, the power output from the kiln, or the like or before the correction is calculated. The power integrated value and the latest power consumption value of the carbonization processing cycle, or the average power consumption integrated value calculated and processed for each of the multiple carbonization processing cycles immediately before and after the latest are displayed on a display device. By comparing the difference in the values, the transition of the extrusion resistance inherently latent in each carbonized chamber 11 can be estimated in accordance with the latest or the wall condition of each carbonized chamber 11 over a plurality of times immediately before and after the latest, and as a result Since the pushing resistance against the degree of wall abnormality in each carbonization chamber 11 can be reduced, it can be developed and utilized as a guideline for judging the necessity of furnace observation and the like. That.
[0036]
Next, in the latter data accumulation system C, the third personal computer 25 is installed in an instrument room or the like, and the respective power consumption data for each carbonization processing cycle transferred from the first personal computer 23 is described. In the storage device of the third personal computer 25, as described above, the properties of the raw coal, the GCT, the firing temperature, the power consumed in the kiln, and the like are accumulated and stored as a carbonization record database.
[0037]
Then, depending on the carbonization record database stored in the third personal computer 25, for example, a daily brand-specific power integrated average value and a latest N-cycle average value for each kiln are displayed on a CRT as a display device. On the other hand, on the other hand, the operation in the data analysis system B is further enhanced by, for example, deploying, in advance, the wall repair guide for the carbonization chamber and the incineration carbon incineration guideline to the data analysis system B by an operator diagnosis. It can effectively promote it.
[0038]
【The invention's effect】
As described above in detail in the examples, according to the method of the present invention, every process of dry distillation of coking coal in the carbonization chamber, the whole kiln discharge process from the start of the kiln discharge of coke cake by the extrusion ram to the end of the kiln discharge. In addition to detecting and collecting the change of the kiln discharge resistance over time as a change in the power consumption of the ram drive motor, the collected power consumption fluctuation detection data including the collected kiln discharge elapsed time for each carbonization processing cycle is collected. In each of the corresponding carbonization treatment cycles, the properties of the raw coal relating to the fluctuations in the power consumption, gross coking time, sintering temperature, correction by adding changes in carbonization conditions such as kiln power, and This is sequentially accumulated in the storage device together with the elapsed time of each kiln discharge, and a carbonization result database is created. In addition, at least the extrusion ram is included in each carbonization result data. Therefore, when the coke cake is discharged from the kiln, the kiln discharge resistance is most remarkable. Changes in the average power consumption in the past calculated from each of the carbonization results data of at least multiple carbonization treatment cycles within the operating time range, and changes in the latest power consumption in the latest carbonization processing cycle within the applicable operation time range, or Display the transition of the latest average power consumption calculated from each carbonization result data of the carbonization treatment cycle several times just before the latest within the operating time range and the transition of the latest average power consumption on the screen as a power waveform or a graphed power waveform. , These power waveforms, or the transition of the historical average power consumption within the specific kiln out operation time range displayed as a graphed power waveform, The analysis is made by comparing both the transition of the latest power consumption within this operation time range and the transition of the latest average power consumption within the operation time range. Since the abnormality is determined, it is possible to quickly and easily confirm the occurrence of abnormalities such as roughening of the surface of the refractory wall of the carbonizing chamber and the occurrence of carbon adhesion, etc., due to the dry distillation of the coking coal that is repeatedly performed in the carbonizing chamber, Based on the result of this determination, it is possible to take appropriate measures, and there is an excellent feature that the carbonization function of the carbonization chamber can always be maintained in a good state.
[0039]
Further, the criterion of the abnormality determination is, for a change in power consumption including a kiln discharge elapsed time by an extrusion ram of an extruder for each carbonization treatment cycle, properties of the raw coal related to the change, gross coking time, Variation data corrected by adding changes in carbonization conditions such as firing temperature and kiln output power value, and, among the dry carbonization results data created based on the variation data, at least the coke at the beginning of kiln release by an extrusion ram. Since it is fluctuation data extracted from the specific kiln discharge operation time range centered around the compression start point to the coke movement start point, unlike the fluctuation of power consumption including the simple kiln discharge elapsed time, the most The variation mode can be easily and appropriately grasped, and as a result, an appropriate wall abnormality can always be determined extremely easily and effectively.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view schematically showing the outline of a coke oven facility to which an embodiment of the present invention is applied, as viewed from the side.
FIG. 2 is a block diagram generally showing an outline of a method for determining an abnormality in a coke oven carbonization chamber wall surface to which an embodiment of the present invention is applied.
FIG. 3 is a block diagram showing a flow from collection to analysis of each carbonization result data in the coke oven carbonization chamber wall surface abnormality determination method.
FIG. 4 is a graph showing power consumption waveforms collected for kiln discharge resistance management in the coke oven carbonization chamber wall surface abnormality determination method, and (a) is a graph showing average power values from the start to the end of data collection; (B) is a graph showing a power average value in a specific range from about 5 sec after data collection start to about 15 sec, and (c) is a graph showing a power average value in a range from about 15 sec after data collection start to end. is there.
[Explanation of symbols]
10 coke oven 11 carbonization room (kiln)
11a One kiln end of the coking chamber 11b The other kiln end of the coking chamber 12 Charging car 13 Extruder 13a Ram drive motor 13b Extrusion ram 14 Guide car 15 Fire extinguishing car 21 Measurement of ram power consumption at the time of coke kiln firing 22 Consumption Power collection 23 First personal computer 24 Second personal computer 25 Third personal computer A Data collection system B Data analysis system C Data integration system a Average power consumption waveform from start to end of data collection b Start of compression to start of movement Range of average power consumption waveform c from start of movement to end of extrusion

Claims (1)

Coking coke is charged into a coking oven (kiln) of a coke oven, and coke cake is extruded after the coking cake is obtained by dry-charging the charged coking coal to obtain a coke cake. In order to operate the extrusion ram of the extruder from one kiln end side of the carbonization chamber to the other kiln end side, to analyze the fluctuation of the kiln discharge resistance loaded on the extrusion ram, A method for determining an abnormality of the carbonization chamber wall surface,
For each carbonization cycle of the coking coal in the coking chamber, the change in the kiln discharge resistance was measured for the ram drive motor over the entire kiln discharge elapse time from the start of the kiln discharge of the coke cake by the extrusion ram to the end of the kiln discharge. A fluctuation detection data collection process of detecting and collecting as a transition of power consumption,
For the fluctuation detection data of the power consumption including the kiln discharge elapsed time for each carbonization processing cycle collected in the fluctuation detection data collection process, for each of the corresponding carbonization processing cycles, the fluctuation of the power consumption. After adding and correcting changes in dry distillation conditions such as the properties of the coking coal, gross coking time, firing temperature, and power output from the kiln, these are sequentially stored in a storage device together with the elapsed time from the kiln. A carbonization results database creation process of creating a carbonization results database based on power consumption fluctuation detection data including the kiln discharge elapsed time;
Of the respective carbonization results data obtained in the carbonization results database creation process, at least when extruding the coke cake by the extrusion ram of the extruder, around the time of the start of coke compression at the beginning of the kiln where the kiln discharge resistance appears most noticeably. The process of setting the actual distillation data comparison range, which takes out the specific kiln discharge operation time centered around from the start of coke transfer to the part where the coke is moved, and partially sets it
The transition of the historical average power consumption calculated from each of the carbonization results data of at least a plurality of carbonization processing cycles within the specific kiln discharge operation time range set in the carbonization results data comparison range setting process, and within the corresponding operation time range. The power waveform shows the transition of the latest power consumption of the latest carbonization processing cycle, or the transition of the latest average power consumption calculated from each carbonization actual data of the carbonization processing cycle over several times just before the latest within the applicable operation time range, Or including a carbonization results data display process to be displayed on the screen of the display device as a graphed power waveform,
The transition of the past average power consumption within the specific furnace operation time range displayed as a power waveform or a graphed power waveform on the screen of the display device, and the transition of the latest power consumption within the corresponding operation time range And a comparison between the latest average power consumption and the transition of the latest average power consumption within the applicable operation time range, and the abnormality of the carbonization chamber wall is determined based on the difference between these two power consumptions. A method for determining the abnormality of a room wall.

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