JPS606391B2 - How to operate a coke oven - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of operating a coke oven, and in particular, the amount of dust generated from fired coke after discharge from the oven is
This method was developed based on the knowledge that there is a strong relationship with the carbonization conditions of the carbonization chamber (carbonization chamber), and depending on the amount of dust generated, the heating conditions of other carbonization chambers that are subsequently carbonized under the same conditions when exiting the kiln: We propose a new coke oven operation method that determines the fire-off time, etc.

Previously, the determination of the coke oven's firing point (the end point of carbonization when almost no gas is produced) was estimated by a worker opening the riser pipe cover and observing the amount and color of the gas produced. .

However, this conventional method was largely influenced by the skill level of the operator and individual differences in perception, resulting in poor judgment accuracy and, in turn, affecting the quality of the coke. On the other hand, the above-mentioned fire fall can be determined from the measured value of the passing gas temperature by a thermal haze pair installed in the riser tube, or by inserting a measuring device into the inside of the riser tube from the top of the riser tube to determine the temperature of the gas above the coke in the furnace. One method was to determine it by measuring transparency. However, in this method, a part of the measuring equipment is installed inside, which means that it comes into direct contact with the generated gas, resulting in tar adhesion to the equipment's detection end.
This method has the drawback of causing carbon precipitation, etc., which impairs measurement and impairs accuracy, and it takes a great deal of effort and expense to overcome this problem. In view of the above-mentioned shortcomings of the prior art, this invention proposes a method for smoothly operating a coke oven by simply determining carbonization conditions, i.e., fire-off time, in a carbonization chamber.

The details of the configuration will be explained below. In the carbonization of coal, the total carbonization time (the time the coal stays in the furnace from charging to extrusion) is shorter than the standard total carbonization time determined by the operating rate, and the progress of carbonization is delayed due to changes in circumstances and heating conditions. In such cases, a large amount of dust is observed when the calcined coke is extruded (out of the kiln). According to the research conducted by the present inventors, it has been found that heating conditions such as the properties at the time of charging, the amount of coal charged, the firing conditions, and the temperature distribution in the furnace have a large relationship with the amount of dust generated above. I found out. However, since this change in heating conditions is manifested as a change in the fire-off time in actual furnace operation, it can be inferred that the above-mentioned amount of dust generation has a strong relationship with the fire-off time. Based on the above knowledge, Figure 1 plots the fire fall time measured using the conventional method, with the vertical and horizontal axes representing the amount of dust generation, that is, the absorbance, and the total carbonization time, respectively. , these 3
It was found that there was a very strong relationship between the two.

Therefore, if you obtain a characteristic diagram as shown in Figure 1 in advance,
No longer relying on the operator to determine the fire-off time, as in the past.
Also, it becomes possible to estimate without installing measuring equipment inside the furnace. For example, as can be seen from this figure, when extruding in a particular kiln, the absorbance was 50% and the total carbonization time was 22 hours.
In this case, the time for the fire to fall was approximately 19. It can be presumed that it was a rice cake.

Next, we will explain how to determine the fire-off time for subsequent kiln discharges.

The above-mentioned fire-off time should be managed so that it takes a constant value under a certain coke operation rate (a ratio with the day of charging and extrusion as 100%). However, in actual coke oven operation, the fire-off time fluctuates due to unavoidable changes in operating conditions such as the properties of the charged coal, the amount of packed coal, and the temperature distribution inside the furnace, and it is always constant even if the furnace operation is the same. It is not possible to operate by maintaining the same value. Therefore, the heating conditions must be changed sequentially so that the fire-off time becomes a target value in line with the above-mentioned constant value, and it becomes necessary to sequentially adjust the fire-off time of each carbonization kiln as in the present invention. It is. Therefore, in the present invention, the fire-off time under specific operating conditions is read from Figure 1 based on the amount of dust emitted at the time of ejecting from the kiln, that is, the absorbance, and the total carbonization time at that time, and the fire-off time is estimated. However, this fire-off time is used as the fire-off time of the carbonization chamber after which the kiln is removed, and is reflected in the coke oven operation.

In addition, ``If the firing time fluctuates significantly, it is necessary to change the carbonization conditions of the coke oven as a furnace group.Also, as a method to sequentially control only the firing time, for example, adjusting the fuel gas or changing the longitudinal direction of the kiln. This can also be done by adjusting the coke oven operating means such as the gas distribution amount and air ratio.According to the example, the amount of dust generated at the time of unloading the kiln is measured at the same fire-off time, for example. However, the longer the fire fall time, the greater the amount of fire generated.

This indicates that the amount of dust generated tends to increase as the residence time from the end of carbonization to extrusion, that is, the standing time becomes shorter. This is clear from the characteristic diagram in Figure 1, and by knowing the absorbance as the amount of dust generated as shown in Figures 3 and 4, you can also know the length of the exposure time in the same way as the fire-off time. It represents what is possible.

As can be seen from the above, the method of the present invention is capable of adjusting the standing time and fire-off time of the coke oven group during a specific period of operation under the same carbonization conditions. Measure the amount of dust generated, calculate the standing time and firing time from the measured value, and calculate this as the standing time for the subsequent kiln removal,
This method is applied as a fire-off time to operate a coke oven.

As shown in Figure 2, the amount of dust generated is measured at three digit locations a to c (not necessarily limited to those locations) provided in the dust collection hood 3 and duct 7, and the dust-containing gas flow is measured. It is preferable to measure the amount of transmitted light using a device that measures the amount of transmitted light and has a light projector and a light receiver on the side of the road. In FIG. 2, reference numeral 1 indicates a coke oven, 2 a guide wheel, 4 a fire extinguisher, 5 a coke wharf, 6 a connector, 8 a dust collector, and 9 a chimney. Note that FIG. 3 shows an example of an absorbance measuring device and represents the amount of dust generated. This device has a function of storing past data for a certain period of time in a dust concentration meter that has a light emitter 10 and a light receiver 11.
It is equipped with a simple calculator having a display function such as an RTI ax. Figure 4 shows an example of observation using a measuring device.
A record of absorbance as shown in the figure can be obtained with one extrusion. The amount of dust generated is calculated by calculating the average value or peak value by data processing the records obtained from extrusion in one kiln shown in FIG. TK=nomina TK(ti)dt/(t
d-ta) TK indicates the average value of the absorbance observed during K-kiln extrusion.

(TK=maxTK(ti) may also be used). As explained above, according to the invention, it is possible to know the standing time and fire-off time during coke oven operation simply by observing the amount of dust generated. In particular, since the detection end of the mechanical device is not directly inserted into the furnace for measurement, there is no failure, and the accurate fire-off time can be determined over a long period of time, allowing stable coke oven operation.

[Brief explanation of the drawing]

Figure 1 of the drawings is a characteristic diagram showing the relationship between absorbance (dust generation amount) and total carbonization time at a certain operating rate as a firing time variable.
Figure 2 is a front view showing the equipment on the discharge side of the coke oven;
The figure is an explanatory diagram of the absorbance measuring device, and FIG. 4 is a graph showing the relationship between absorbance and time. 1... Coke oven, 2... Guide wheel, 3... Dust collection hood, 4.
...Fire engine, 5...Coke Wharf, 6...Connector, 7...Duct, 8...Dust collector, 9...Chimney. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1. When operating a coke oven when a large number of carbonization chambers are operated under the same carbonization conditions, the relationships between the amount of dust generated, the total carbonization time, and the fire-off time are determined in advance, and the Calculate the fire-off time based on the amount of dust generated and the total carbonization time for the fired coke taken out of the kiln, and use the determined fire-off time as the standing time and fire-off time for each carbonization chamber that will be taken out of the kiln thereafter. A method of operating a coke oven characterized by operating it by sequentially adopting the methods.