JPH0477596A - Device for preventing clogging in coke furnace - Google Patents

Abstract

PURPOSE:To obtain the title device free from clogging in a coke furnace by estimating the time after outputting signal when dry distillation of coke furnace is over, maximum value of extrusion output of extruder before storing and maximum value of next extrusion force by actual leaving time and operating and displaying the waiting time when the value is large. CONSTITUTION:In a device for preventing clogging of coke furnace, a dry distillation- finishing detection means 11 for detecting gas temperature of a carbonization chamber 22 in coke furnace 21 with a sensor 42 and then outputting dry distillation-finishing signal of coal when the gas temperature becomes a prescribed temperature or below, a leaving time-measuring means 13 for inputting the above-mentioned output and furnace-out direction signal and obtaining actual leaving time, a driving force detection means 12 for detecting extruding force of an extruder 31, a storing means 14 for each storing actual leaving time of leaving time-measuring means 13, an operating means 15 of waiting time for estimating maximum value of extruding force to the next time based on all of the time elapsed after dry distillation-finishing signal is output, the maximum value of past extruding force stored in the storing means 14, and the leaving time and the operating waiting time when the maximum value is larger than a prescribed value, and a display means 16 thereof are provided.

Description

[Detailed description of the invention] [Industrial application fields] The present invention relates to a device for preventing clogging of a coke oven oven.

[Prior Art and Problems to be Solved by the Invention] In the operation of a coke oven, coke that has been carbonized is extruded from the coke oven by a pusher of an extruder. However, smooth extrusion of coke may not be possible due to aging of the coke oven, such as rough skin, curvature, adhesion of carbon to the oven walls, poor oven temperature control, and changes in coal properties.

If coke extrusion does not occur smoothly, the order of coke extrusion and coal charging will be disrupted, resulting in an increase in heat consumption, a decrease in production, a decrease in coke quality, and damage to the furnace wall due to abnormal loads on the furnace wall. Problems such as damage may occur. In particular, since damage to the oven walls greatly affects the life of the coke oven, prevention of oven clogging has been an important issue.

Conventionally, there is a technique disclosed in Japanese Patent Laid-Open No. 1-247483 as a technique for monitoring extrusion in a coke oven.

This publication proposes a method for monitoring extrusion force by measuring extrusion current during extrusion work. However, in this case, the extrusion results were simply judged, and the judgment results were only used as guidelines for coke oven operational management, such as determining when to burn off the furnace wall carbon and utilizing them for furnace temperature adjustment work. .

This invention was made in view of this situation, and it is possible to extrude coke by quantifying the relationship between the elapsed time after the completion of coal carbonization, that is, the standing time, and the maximum value of extrusion current during extrusion of coke. Calculate the maximum value of the extrusion force beforehand, and if the maximum value or a predetermined reference value is exceeded, calculate the holding time to prevent the extrusion force from exceeding the maximum value or the predetermined reference value and notify the operator. The object of the present invention is to provide a device for preventing clogging of a coke oven, which prevents clogging of the oven.

[Means for Solving the Problems] Fig. 1 is a block diagram showing the configuration of a coke oven oven clogging prevention device according to the present invention. Carbonization end detection means (11) that detects and outputs a carbonization end signal of coal when the temperature becomes below a predetermined temperature, driving force detection means (12) that detects the extrusion force of the extruder, and carbonization end detection means (11).
A placing time measuring means (13) which calculates the actual placing time by inputting the output of the kiln ratio and the kiln ratio command signal, and a driving force detecting means (13).
2) storage means (14) for storing the extrusion force and the actual storage time of the storage time measuring means (13) each time coke is extruded; ) The maximum extrusion force of the extruder for the next extrusion is predicted based on the past maximum extrusion force of the extruder and the actual time, and the maximum value is greater than or equal to a predetermined value. In this case, a calculation means (15
), and display means (16) for displaying the waiting time or kiln removal time determined by the calculation means.

[Function] In this invention, the carbonization end detection means (11) detects when the carbonization of coal is completed and outputs a coal carbonization end signal, and the aging time measuring means (13) detects the carbonization end signal and the kiln. The actual ejection time is determined each time by inputting the ejection command signal, and is stored in the storage means (14) together with the extrusion force from the driving force detection means (12).

The calculation means (15) calculates the elapsed time and the storage means (14).
The maximum extrusion force of the extruder for the next extrusion is predicted based on the past maximum extrusion force of the extruder and the actual time stored in If so, calculate the waiting time such that the waiting time is equal to or less than a predetermined value. That is, the waiting time is determined by utilizing the property that the extrusion force decreases as the holding time increases. The display means (16) then displays the waiting time or kiln removal time determined by the calculation means (15). The operator operates the extruder according to the waiting time displayed on the display means (16) to extrude coke from the coke oven.

[Embodiment] FIG. 1 is a block diagram of a coke oven oven clogging prevention device according to an embodiment of the present invention. The coke oven (21) is provided with combustion chambers (23) and (24) on both sides of a carbonization chamber (22).
It is separated from 4) by partition bricks (25) and (26). The carbonized coke is extruded by a pusher (32) of an extruder (31). The pusher (32) is driven by a rack (33) fixed to the pusher. The pinion (34) is driven by a motor (36) via a reduction gear (35). And the motor (36)
The driving overlap is detected by the motor control panel (37), and the extrusion current is sent to the computer (41) via the control device (38).
sent to.

In addition to the extrusion current, the calculator (41) also has a coke oven (2
A temperature signal from a sensor (42) for detecting the gas temperature in 1) is input, and a display (43) for displaying calculation results and the like is also connected. In addition to the above-mentioned information, the calculator (41) also contains the charging time and amount when charging coal, and the extrusion time when extruding coke.

FIG. 3 is a characteristic diagram showing the distribution of the extrusion current with respect to the position of the coke oven, and FIG. 4 is a characteristic diagram showing the relationship between the placing time and the peak value of the extrusion current. Charging specifications for each kiln (charging amount, moisture value, volatile matter, particle size, reflectance,
fluidity, ash content), operational specifications (actual fire-off time, standing time, etc.) and characteristic values of extrusion current (peak value, area, etc.)
When examining the relationship between
As shown in FIG. 4, it was found that there is a high correlation with the maximum value of (or electric power). As a result, the following prediction formula was obtained.

1, -a φST,, 10s,, =l
l) mAiJhrl, + IJ ■ ・Peak value of extrusion current (mA) IIIA゛ST: Elapsed time (hr) hr a; b: Constant i: Kiln characteristic: This time, the constant a also depends on charging specifications and operating specifications. It was found that the constants vary greatly depending on the characteristics of each kiln (curvature, surface roughness, carbon adhesion).

Generally, the purpose of operating a coke oven is to stably produce coke of a target grade at low cost. For this reason, since changes in charging specifications and operating specifications are adjusted in advance to minimize them, a is kept constant and changes in charging specifications and operating specifications are absorbed by b. , b are determined by the following equation.

b,, -1', -a -ST',, -
(2) 01J mAi, + hrI
Jl” ・Peak value of extrusion current (actual) -A.

ST@: Actual time hr bl, -αb+(1-α)b ,...(8) IJ+
l ij 01koO
≦α≦1 Also, when the peak value of the extrusion current exceeds the reference value (4
) From the formula, Io: Waiting time t1 until extrusion becomes possible at the standard value of extrusion current. Calculate J.

In this example, the values obtained by monitoring the extrusion current at a cycle of 200 msec based on the extrusion start signal until the extrusion completion signal is received are normalized to 96 values. The maximum value and area are calculated based on the value of .

Explain the following operation.

When the temperature of the gas from the sensor (42) drops to a predetermined temperature, the computer (41) stores the time as if the carbonization of coal has been completed. Then, before notifying the operator of the next scheduled extrusion window (6
~10 minutes ago), perform the next calculation process.

That is, the maximum value of the extrusion current is calculated based on equation (1). Then, the maximum value of the extrusion current is set to a preset reference value (
If 1o) is exceeded, the waiting time until extrusion becomes possible is calculated using equation (4), and the result is displayed on the display (43) to notify the operator, and an alarm is also output at the same time. Then, the waiting time may be counted down and displayed one after another. Further, the kiln unloading time may be calculated based on the standby time and the current time and displayed on the display (43).

FIG. 5 is an explanatory diagram showing a display example of the display (43).

In this embodiment, the display (43) indicates the number of clogged ovens.
o, and the entire waiting time is displayed. In addition, the calculator (41) monitors the kiln clogging waiting time every 5 minutes, and when the waiting time is over, the display (41)
3) Notify the operator through.

Incidentally, each kiln has different characteristic values that change over time, but since the push current is detected and memorized every time the kiln is extruded and the characteristic values of the kiln are learned, the It requires time to put it on.

In other words, during extrusion, the characteristic value is calculated using equation (2), and (3
) is used to perform exponential smoothing to optimize changes in characteristic values (α-0,5 in this example). Further, in this embodiment, the characteristic values of the oven, actual values of bead current and area can be displayed for each furnace group of the coke oven, so that the clogging status of the coke oven oven can be constantly monitored. FIG. 6 shows an example of the display.

In addition, when the carbon in the coke oven (21) is burned off, it is 0. should be returned to its initial value, but (1) the initial value cannot be determined.

(2) Even if used as is, there will be no particular problem in operation.

etc., no special treatment was taken in this example.

In addition, in the above-mentioned example, an example was shown in which the maximum value of the drive current of the motor was determined in order to determine the maximum value of the extrusion force.
A load meter (39) may be provided on the output side of the reducer (35), and the maximum value of the pushing force of the pusher (32) may be directly determined and processed in the same manner.

[Effects of the Invention] As described above, according to the present invention, when the extrusion force of the coke oven is predicted at the time of unloading from the kiln, and the extrusion force exceeds a predetermined value, the extrusion force of the coke oven is By utilizing the property that the extrusion force decreases as the extrusion force increases, the operator is informed of the waiting time when the extrusion force reaches its maximum value or less than a predetermined value.The following effects have been obtained.

(1) Since clogging of the oven can be predicted before extrusion of coke, clogging of the oven can be almost completely prevented.

(2) Preventing kiln clogging can extend the life of the furnace body.

(3) Reduced coke production and problems with extruder can be prevented.

(4) In the future, it can be linked to automatic operation of the extruder by automatically changing the extrusion schedule until the clogging of the kiln is cleared.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is a configuration diagram of a coke oven oven clogging prevention device according to an embodiment of the present invention, and FIG. 3 is a characteristic diagram showing measured values of extrusion current. , Fig. 4 is a characteristic diagram showing the relationship between the holding time and the peak value of extrusion current, Fig. 5 is an explanatory diagram of the method for notifying the operator of clogging of the kiln, and Fig. 6 is an explanatory diagram of the display of the clogging status of the kiln in the furnace group. be. In the figure, (21) is a coke oven, (31) is an extruder, (41) is a calculator, (42) is a sensor, and (43) is a display.

Claims (2)

[Claims] (1) carbonization end detection means that detects the gas temperature of the coke oven and outputs a coal carbonization end signal when the temperature falls below a predetermined temperature; driving force detection means that detects the extrusion force of the extruder; and the carbonization end detection means that detects the extrusion force of the extruder. A placing time measuring means inputting the output of the means and the kiln unloading command signal to obtain the actual placing time; and storing the extrusion force of the driving force detecting means and the actual placing time of the placing time measuring means each time the coke is pushed out. a storage means for controlling the extruder for the next extrusion, based on the elapsed time after the carbonization end signal is output and the past maximum extrusion force and actual elapsed time of the extruder stored in the storage means; a calculation means for predicting the maximum value of the extrusion force, and calculating a waiting time such that the maximum value is equal to or less than a predetermined value when the maximum value is greater than or equal to a predetermined value; and a waiting time determined by the calculation means. A coke oven oven clogging prevention device having display means for displaying. (2) The coke oven oven clogging prevention device according to claim 1, further comprising a display means, in place of the display means, for displaying the time for unloading the oven based on the standby time determined by the calculation means and the current time.