JP2764219B2 - Abnormality diagnosis method for coke oven carbonization chamber furnace wall - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of diagnosing the presence or absence of an abnormality in a coke oven wall and the condition of the oven wall.

2. Description of the Related Art In a carbonization chamber of a coke oven, a coke side where a guide wheel and a fire extinguisher are located has a slightly wider interval than a machine side where an extruder is usually located in plan view. To extrude the coke cake after carbonization from the carbonization chamber, place the extruder exactly in front of the carbonization chamber, and while projecting the ram equipped on the extruder from the machine side of the carbonization chamber toward the coke side, The coke cake is extruded from the coke side by the extrusion head attached to the.

In this case, if there is an abnormality in the furnace wall of the carbonization chamber, excessive force is applied to the ram of the extruder, and in the extreme case, it is impossible to extrude the worst case. So in actual operation,
In order to prevent damage to the furnace wall due to excessive extrusion or to prevent a situation in which extrusion is impossible, it is important to know whether there is an abnormality in the furnace wall of the coking chamber.

One method of diagnosing the presence or absence of abnormalities in the furnace wall of the coking chamber is to detect the load on the drive motor of the ram of the extruder, and to determine the maximum value of the load and the end of the extrusion after the extrusion head hits the coke cake. At least one of the average value of the load before the brake is applied to the ram (that is, the average value of the entire load) is determined, and is used to determine whether or not the furnace wall is abnormal.

As another method, a load pattern is output to a high-speed chart, and the presence or absence of a furnace wall abnormality is empirically analyzed from the pattern waveform.

JP-A-63-68690 discloses that a true extrusion load current value is obtained from a difference between an average value of a forward load current and an average value of a return load current when a coke pushing head reciprocates in a predetermined section in a carbonization chamber. Calculate and calculate the coke setting time from the fire detection time of the carbonization chamber and the coke extrusion detection time,
The method for determining the degree of abnormality of the wall surface of a coke oven carbonization chamber, in which the true extrusion load current value is corrected by a load current correction value based on the coke placing time and is used as an extrusion load current value for determining the degree of wall abnormality of the carbonization chamber. It is shown.

SUMMARY OF THE INVENTION Among the methods described above, the method of detecting a load applied to a drive motor of a ram of an extruder and obtaining a maximum value of the load and / or an average value of the entire load includes a method in which a furnace wall is normal. Although it is possible to distinguish between abnormal and abnormal, it is not possible to know the situation of abnormalities in the furnace wall.

The method of outputting the load pattern to a chart and analyzing the waveform of the furnace wall for the presence or absence of an abnormality is based on the fact that the waveform of the load pattern at the time of the occurrence of the abnormality varies widely, Due to the rise of the floor due to the notch and the peak due to the notch switching (acceleration), etc., and the actual load curve is far away from the true load curve of coke only. There is a problem that it has to be a qualitative one to rely on, and it is difficult to create an objective standard. Also, outputting, analyzing, and accumulating high-speed charts for all the load patterns of a large number of coke oven coking chambers is not an appropriate measure because of the huge amount of data. The chart can be compressed by adjusting the feed rate of the high-speed chart, but it has its own limitations, and extreme compression makes it virtually impossible to decipher the maximum or minimum value.

The method disclosed in Japanese Patent Application Laid-Open No. 63-68690 discloses a method in which the true extrusion load current value is corrected by a load current correction value based on the coke placing time, and the extrusion load current for determining the degree of wall abnormality of the carbonization chamber is determined. It is intended to improve the accuracy of pattern analysis. However, even if it is possible to more accurately know the presence or absence of an abnormality by this method, the condition of the furnace wall abnormality, for example, whether the cause of the abnormality is a narrow or enlarged coke side area near the center, a narrow or enlarged front of the coke side, There is a limit that it is difficult to judge easily whether the coke side area near the center is enlarged and the front area is narrowed, and whether the furnace wall is widely curved.

The present invention has been made in view of the above circumstances, and has as its object to provide an industrially applicable method capable of effectively diagnosing the presence / absence of a coke oven carbonization chamber furnace wall and the condition of the furnace wall.

Means for Solving the Problems The abnormality diagnosis method for the coke oven carbonization chamber furnace wall of the present invention is based on load information applied to a ram drive motor when extruding coke cake in a coke oven with an extrusion head mounted on the ram. A method for diagnosing abnormalities in the furnace wall, where the load first shows a peak value after the extrusion head comes into contact with the coke cake by the start of the ram operation.
The load information La at the time when the load shows the second or later peak value within a predetermined time after the lapse of the time Ta, and shows the largest or n-th largest peak value among the second and later peak values. Time
Load information Lb at Tb, and load information Lx composed of a total value of loads within a specific time range after the time point Ta or an average value thereof, and a furnace wall based on these load information La, Lb, and Lx. It diagnoses the presence or absence of abnormalities and the condition of the furnace wall.

 Hereinafter, the present invention will be described in detail.

The load pattern when the furnace wall is normal is, for example, as shown in FIG. The load pattern when the furnace wall is abnormal is, for example, as shown in FIG. The vertical axis represents the load, and the horizontal axis represents the elapsed time after the start of the ram or the working distance of the ram.
Note that the load can be represented by a power value, and since the drive motor voltage of the ram is usually constant, it can also be represented by a current value.

Point A is the starting peak when the ram is started, and point B is the point where the extrusion head of the ram hits the coke cake.
After the point B, the coke cake is compressed, and at the point C, the compression resistance of the coke cake and the switching of the first notch overlap, and show a substantially constant level regardless of whether the kiln is normal or abnormal.

In the normal case, the load decreases when the coke cake begins to move just after point C, and thereafter the load decreases gradually as the coke is pushed out of the furnace. D
The points, points E and F are peaks that appear during the decreasing process, and these peaks are based on notch switching when powering up the ram. Point G is the brake peak.

In FIGS. 1 and 2, the curve area shown by the solid line is the original load, and the curve area shown by the dotted line has no direct relation to the load by the coke cake. In addition to the above, in actuality, the bottom is raised by a brake (sometimes omitted) at the initial stage of extrusion, the influence of carbon deposited on the furnace wall, the influence of the storage time, and the like are added.

In the present invention, the following three pieces of load information are grasped, and the presence or absence of a furnace wall abnormality and the state of the furnace wall are diagnosed based on these pieces of load information. The load information includes, in addition to the apparent load, the actual load from which the other effects as described above are deducted, the apparent load and the load obtained by further processing the actual load by statistical processing or the like.

La, which is the first load information, is load information at the time Ta when the load first shows a peak value (first peak value) after the extrusion head comes into contact with the coke cake by the start of the operation of the ram. Time point Ta is the first in the example shown above.
This corresponds to point C in the figures and FIG. However, a point slightly away from the point C may be set as the time point Ta. The time point Ta is usually a time point at which 7 to 8 seconds or a time before or after the operation of the ram has elapsed.

Lb, which is the second load information, is the time point at which the load shows the second and subsequent peak values within a predetermined time after the elapse of the above time point Ta, and is the maximum or n of the second and subsequent peak values.
This is load information at time Tb showing the second largest peak value. The time point Tb corresponds to D in FIGS. 1 and 2 in the above example.
Point, point E or point F. Normally, the point of time showing the largest peak value among the second and subsequent peak values is Tb,
In some cases, the time point at which the second and third peak values are shown may be Tb. Instead of the strict peak value, a point slightly separated from the target peak value may be set as the time point Tb. Time Tb
Is a time point immediately after the time point Ta or a time point within 10 seconds from Ta.

Lx, which is the third load information, is load information including a total value of loads within a specific time range after the time point Ta or an average value thereof. It is desirable that this time range includes a time zone in which the load after the elapse of the time point Ta shows the second and subsequent peak values (the first peak is, as described above, the normal kiln and the abnormal kiln). Irrespective of the time), it is desirable that the end point of the time zone be a point that has passed about 7 to 15 seconds from the time point Ta. However, it is also possible to adopt a time zone starting from the time when the second and subsequent peak values substantially no longer appear.

By grasping these three pieces of load information, the feature points of the load pattern can be suppressed, and it is possible to diagnose the presence or absence of an abnormality in almost all the furnace walls and the state of the furnace walls.

Based on the diagnosis, if necessary, take measures such as furnace interior inspection, carbon firing, setting of the location, method and timing of furnace body repair, furnace width measurement, furnace body cutting, etc.

Operation and Effect of the Invention Information on the quality of the furnace wall appears as condensation on the waveform of the extrusion load within 10 to 10 seconds after the extrusion head of the ram comes into contact with the coke cake. By grasping the three pieces of load information La, Lb, and Lx, it is possible to diagnose the presence or absence of an abnormality in the furnace wall and the condition of the furnace wall.

Looking at an example of diagnosis, the load information La at time Ta and the time
In comparison with the load information Lb of Tb, if La-Lb is sufficiently larger than a certain value (for example, 0), it is possible to diagnose that the condition of the furnace wall is normal only by the compression of the coke cake and the starting resistance. When La-Lb is smaller than a certain value (for example, 0), it means that there is another resistance after the compression resistance, and it is determined that an abnormality has occurred in the furnace wall, and attention is required. La
When -Lb is much smaller than a certain value (for example, 0), it means that there is another large resistance after the compression resistance, the abnormality of the furnace wall is diagnosed as large, and it is necessary to take immediate action. It is.

Further, when the load information Lx is larger than the allowable range, it can be determined that there is an abnormality in the furnace wall. La-Lb is equal to or less than a certain value (for example, 0)
When Lx is large, it can be determined that there is a wide range of curvature in the furnace wall instead of the narrowness in the coke side region or its front, and it can be said that it is rather a malicious abnormality.

Knowing these three pieces of load information La, Lb, and Lx by accumulating data on the actual furnace, it is possible to estimate the outline of the waveform of the load pattern. Can be ordered.
Also, the condition of the furnace wall abnormality, such as whether the coke side area near the center is narrow or enlarged, whether the front of the coke side is narrow or enlarged, whether the coke side area is wide and the front narrow, and whether the furnace wall is wide It can also be diagnosed whether there is a curvature. Therefore, the man-hour and labor of furnace wall observation requiring a large amount of labor can be reduced.

The load information La, Lb, Lx and the relationship among them can be automatically calculated, thereby saving labor. In most cases, the load information La, Lb, and Lx indicate a normal value. Therefore, when only the normal value is indicated, if only such load information is recorded, the load pattern chart is not necessarily output or saved. You don't have to. When the load information La, Lb, or Lx indicates an abnormal value, the presence / absence of a furnace wall abnormality and the state of the furnace wall abnormality can be objectively grasped, so that there is no individual difference in diagnosis. If an abnormal value is indicated, a detailed chart may be taken next time for analysis.
As a result, a huge amount of high-speed charts can be reduced while securing necessary information.

EXAMPLES Next, the present invention will be further described with reference to examples.

FIG. 3 is a graph showing an example of a load pattern when the furnace wall is normal, and FIGS. 4 to 8 are graphs showing an example of a load pattern when the furnace wall is abnormal. In each case, the beginning and end of the chart are cut off.

In these embodiments, as the time point Ta corresponding to the load information La, the time point at which the load first shows a peak value after the start of the ram operation and the contact of the coke cake (7,8 seconds after the ram operation) ) Is adopted, and as the time Tb corresponding to the load information Lb, the time indicating the maximum peak value among the peaks appearing within 10 seconds after the lapse of the time Ta is employed. As the load information Lx, The average value of the load during a time period of 10 seconds starting from 2 seconds was adopted.

The presence / absence of abnormalities and the state of abnormalities in the furnace wall were diagnosed in consideration of the accumulation of knowledge in the actual furnace.

In FIG. 3, La is larger than Lb, and the peak values are in the order of point D> point E> point F. A general kiln with a normal furnace wall and a proper placing time has no special resistance at the time of extrusion and almost follows the pattern shown in FIG. Most kilns exhibit this pattern.

In FIG. 4, Lb is considerably larger than La, and Lx is extra large, and the height of the peak value is D point <E point <F point, contrary to FIG. This waveform implies that there is another large resistance immediately after the compression resistance. From this information, it can be diagnosed that the coke side area or the front of the coke side is extremely narrow, and urgent measures are required.

In FIG. 5, Lb is comparable to La, and Lx is also large. From this information, it can be diagnosed that the furnace wall has a wide area curvature, and urgent measures are also required.

In FIG. 6, Lb is considerably larger than La, the second peak is smaller than the first peak, the third peak is protruded thereafter, and Lx is also large. From this waveform information, it can be diagnosed that an enlargement is seen in the central coke side area and that there is a narrow portion at the front of the coke side.
Such an abnormality is a typical abnormality found in a defective kiln.

In FIG. 7, Lb is slightly larger than La, and
Although the second peak is larger than the first peak, the order is second>third> fourth peak, and Lx is medium. From this waveform information, it can be diagnosed that there is a narrow portion at the front of the coke side. Such an abnormality is also a general abnormality found in a defective kiln.

In FIG. 8, La is larger than Lb, and
Peak ≒ 3rd peak <4th peak, Lx
Is moderate. From this waveform information, it can be diagnosed that the coke side area is slightly deeper and the front of the coke side is light and narrow.

[Brief description of the drawings]

FIG. 1 is a graph showing an example of a load pattern when the furnace wall is normal, and FIG. 2 is a graph showing an example of a load pattern when the furnace wall is abnormal. The vertical axis represents the load, and the horizontal axis represents the elapsed time after the start of the ram or the working distance of the ram. FIG. 3 is a graph showing an example of a load pattern when the furnace wall is normal, and FIGS. 4 to 8 are graphs showing an example of a load pattern when the furnace wall is abnormal. In each case, the beginning and end of the chart are cut off.

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) C10B 57/00 C10B 41/00 C10B 29/06

Claims (1)

(57) [Claims] 1. A method for diagnosing an abnormality in a furnace wall based on load information applied to a drive motor of a ram when a coke cake in a coke oven is extruded by an extrusion head mounted on the ram. The load information La at the time Ta at which the load first shows the peak value after the extruding head comes into contact with the coke cake, and the time when the load shows the second and subsequent peak values within a predetermined time after the elapse of the time Ta. At the time Tb indicating the largest or n-th largest peak value among the second and subsequent peak values
The load information Lb, and the load information Lx, which is a total value of loads within a specific time range after the time point Ta or a load information Lx composed of an average value thereof, is grasped, and the furnace wall is determined based on the load information La, Lb, and Lx. A method for diagnosing an abnormality in a coke oven carbonization chamber furnace wall, comprising diagnosing the presence or absence of an abnormality and the condition of the furnace wall.