JPH05339580A - Operation of coke oven - Google Patents

Abstract

PURPOSE:To provide a process for operating a coke oven whereby the failure in pushing can be prevented by measuring the rates of vertical and horizontal burning loss of coal blend to be fed into an actual oven in a test coke oven and controlling the rates of burning loss to be above specified values. CONSTITUTION:The failure in pushing coal blend is prevented by measuring the change in the burning loss of the coal with time by coking it in a double- heated test coke oven before feeding to an actual coke oven, confirming that the ratio of the rate of vertical burning loss reached when the temperature in the center of the coke chamber reaches the resolidification temperature or when the expansion pressure decreases to zero to the height of the fed coal is 2% or above or that the rate of horizontal burning loss as defined by the ratio of the horizontal burning loss to one half of the oven width is 2% or above and feeding the coal blend into an actual coke oven.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of operating a coke oven.

[0002]

2. Description of the Related Art In the operation of a coke oven, when the coke is discharged (extruded) from the oven, the coke sometimes becomes stuck in the oven and does not move at all. This phenomenon is called "clogged" and is one of the serious troubles that occur during the operation of the coke oven.

When this clogging occurs, a large load is applied to the furnace wall of the coke oven, the life of the coke oven is shortened, the operation is interrupted, and the storage time until the extrusion becomes possible increases and the charging schedule is increased. Therefore, the coke production amount as a furnace group decreases, and the heat consumption also increases, leading to an increase in coke production cost.

Conventionally, this clogging has been controlled by the extrusion current of the extrusion ram for extruding the coke and the volatile content of the coal blend.

If the extrusion current tends to increase and the extrusion resistance tends to increase, actions such as extending the placement time and repairing the furnace wall / furnace bottom for kilns with a large extrusion current are taken. I've been trying to prevent it from getting stuck. Although this control method is effective, it is clear that the action will fall behind, and if the composition is suddenly changed or the operating conditions (such as operating rate and water content) are changed, the extrudability is judged. There was no material to be used, and I had no choice but to judge whether or not it could be extruded by actually performing carbonization in an actual coke oven.

Regarding the volatile matter of the blended coal, the lower limit of the volatile matter amount of the coal charged in the coke oven is usually set for the operation. However, if the volatile content is low, the extrudability cannot be said to be poor, and it cannot be said to be an effective management index.

[0007]

DISCLOSURE OF THE INVENTION According to the present invention, before charging the coal blend into an actual coke oven, a carbonization test of the coal blend is carried out in a test coke oven, and the charged coal in the height direction or the furnace width direction or An object of the present invention is to provide a method for operating a coke oven which evaluates the coke extrudability by measuring the amount of displacement of the coke during carbonization, thereby preventing clogging and enabling stable operation.

[0008]

The feature of the present invention resides in that the blended coal for charging a coke oven is carbonized in a double-sided heating type test coke oven before charging the actual coke oven, and the coal is charged during carbonization. Alternatively, the temperature at the center of the furnace width direction, the center of the furnace length direction, and the center of the furnace height direction is measured by continuously measuring the displacement (expansion or contraction amount) of the height of the coke according to JIS-M-8.
A vertical direction baking defined by the ratio of the height direction shrinkage amount to the coal charging height is obtained by obtaining the amount of shrinkage in the height direction from the resolidification temperature of the coal blend defined in 801 to the end of carbonization. A method for operating a coke oven, which comprises charging the blended coal into an actual coke oven after confirming that the reduction rate is 2% or more.

The blended coal for charging the coke oven is carbonized in a double-sided heating type test coke oven capable of measuring the expansion pressure in the coal carbonization process before charging the actual coke oven. Displacement (expansion or contraction amount) is continuously measured, and the contraction amount in the height direction from when the expansion pressure acting on the furnace wall of the coke oven becomes 0 to the end of carbonization is calculated. A method for operating a coke oven, comprising charging the blended coal into an actual coke oven after confirming that the vertical burning rate defined by the ratio of the heights of charging the coal is 2% or more. ..

The coal blend for charging the coke oven is carbonized in a double-sided heating type test coke oven before charging the actual coke oven, and the change in the gap between the furnace wall and the surface of the coal or the coke in contact with the furnace wall during the carbonization is changed. The horizontal burning rate defined by the ratio of the size of the gap at the end of carbonization and the width of the furnace / 2 after continuous measurement is 2
%, And then charging the blended coal into an actual coke oven after confirming that the content is not less than 100%.

[0011]

The operation of the present invention will be described in detail below.
The inventors have studied the relationship between the extrudability of coke and the gap between the furnace wall and the coke surface in contact with the furnace wall during extrusion (hereinafter referred to as horizontal burnout), and the smaller the horizontal burnout, the higher the resistance to extrusion. It was found that the size was large, and that it was easy to get stuck. In addition, the inventors diligently studied the temporal burnout and the temporal change of the amount of shrinkage of the charged coal or the coke in the furnace high direction (hereinafter referred to as vertical burnout), and determined the center position of the carbonization chamber (the furnace width). (The center of the directional direction, the center of the furnace length direction, and the center of the furnace height direction) reaches the resolidification temperature defined in JIS-M-8801, and the expansion pressure acting on the furnace wall of the coke oven is 0.
After that, I found out that the horizontal burning started to occur.

Further, the inventors have found that the total amount of vertical burn-off immediately after charging until the end of carbonization does not correlate with the amount of horizontal burn-off, but the vertical burn-off after the expansion pressure becomes zero. It has been found that the amount has a very good relationship with the amount of horizontal burnout as shown in FIG.

That is, the amount of horizontal burn-off is made to be a certain value or more, or after the expansion pressure having a good correlation with horizontal burn-off becomes 0, or the temperature at the center of the carbonization chamber reaches the re-solidification temperature. It is considered that the extrusion resistance can be controlled and the clogging can be prevented by setting the amount of vertical burning after reaching to a certain value or more.

As a result, the inventors studied the relationship between the extrudability in an actual coke oven and the amount of burnout measured in the test coke oven, and after the expansion pressure became 0, or the center position of the carbonization chamber. The vertical burnout ratio defined by the ratio of the vertical burnout amount and the charging height after the temperature reaches the resolidification temperature is 2% or more, or the horizontal burnout amount and the furnace width / The horizontal burnout rate defined by the ratio of 2 is 2%
In the above cases, it was found that the jam did not occur. The present invention has been completed based on these findings.

That is, in the present invention, a double-sided heating type test coke oven is used, and the mixed coal for charging the coke oven is carbonized under the same conditions as the actual coke oven. In this double-sided heating test carbonization furnace, it is possible to simulate the heat transfer behavior inside the carbonization chamber, and thus it is possible to simulate the shrinkage behavior of coke. In consideration of heat loss from surfaces other than the furnace wall surface, it is desirable that the furnace length and furnace height be at least as large as the furnace width. With this test furnace, vertical burnout
The changes with time of temperature at the center of the furnace width direction, the center of the furnace length direction and the center of the furnace height direction are continuously measured. Then, the vertical burn-down amount from the time when the temperature reached the re-solidification temperature of the blended coal defined in JIS-M-8801 to the end of the carbonization was calculated, and the burn-down amount and the charging height were calculated. Calculate the vertical burnout rate defined by.

Alternatively, for example, in a double-sided heating type test coke oven in which the furnace wall on one side is movable and the expansion pressure in the coal carbonization process can be measured, the coal blend for charging the coke oven is carbonized and Vertical burnout and aging change of expansion pressure are continuously measured. Then, the vertical burning amount from the time when the expansion pressure becomes 0 to the end of the carbonization is obtained, and the vertical burning ratio defined by the ratio of the burning amount and the charging height is calculated.

Alternatively, by using a double-sided heating type test coke oven capable of measuring the horizontal burnout, the coal blended in the coke oven is carbonized under the same conditions as the actual furnace, and the temporal change of the horizontal burnout during the carbonization is performed. Measure continuously. Then, the amount of horizontal burn-off from the start of dry distillation to the end thereof is obtained, and the horizontal burn-off rate defined by the ratio of the amount of burn-off and furnace width / 2 is calculated.

In the present invention, after confirming that the vertical burning rate or the horizontal burning rate thus measured is 2% or more, the coal blend is charged into an actual coke oven for operation. To do.

[0019]

【Example】

Example 1 In a double-sided heating movable wall type carbonization test furnace having a furnace width of 400 mm, a furnace height and a furnace length of 600 mm, carbonaceous materials as shown in Table 1 were carbonized, and burned in the vertical direction, burned in the horizontal direction, and expanded under pressure. The temperature change at the center of the carbonization chamber was measured. At this time, the crushed particle size of coal is 85% or less, and the dry density is 0.80 t / m ³ and the water content is 5%. From this test, it was confirmed that the expansion pressure became 0 immediately after the temperature of the center of the carbonization chamber reached the resolidification temperature defined in JIS-M-8801. Further, the vertical burn rate and the horizontal burn rate were obtained from the vertical burn rate and the horizontal burn rate after the expansion pressure became zero. The relationship between the two is shown in FIG. From this, it was found that the two values were almost equal, and the vertical burn-off after the expansion pressure became 0 was able to evaluate the horizontal burn-off.

[0020]

[Table 1]

Example 2 Various types of actual charging coal were loaded into a furnace with a furnace width of 400 mm, a furnace height and a furnace length of 6 mm.
Dry distillation in a movable wall type dry distillation test furnace of both sides heating type of 00 mm,
The changes over time in the expansion pressure and the vertical burnout were measured, and the vertical burnout rate after the expansion pressure reached 0 was determined. At the same time, the same blended coal was also charged into the actual furnace, and the extrusion current during coke extrusion was measured. FIG. 2 shows the relationship between the vertical burning rate and the extrusion current after the expansion pressure becomes zero. From this figure, when the burnout rate becomes smaller, the extrusion current increases,
It can be seen that the extrusion current reaches the upper limit value when the burnout rate is 2%. If the extrusion current exceeds the upper limit value, the extrusion ram will stop and become stuck. Therefore, it can be understood that if the burnout rate is controlled to be 2% or more, the clogging in the actual furnace can be avoided.

[0022]

EFFECTS OF THE INVENTION According to the present invention, it is possible to prevent clogging in an actual coke oven by measuring the burn-off amount of the charged coal in the test furnace and controlling the burn-down rate to a certain value or more. This enables stable operation, avoids damage to the furnace wall due to clogging, reduces furnace wall repair costs, and extends furnace life, which is highly economical.

[Brief description of drawings]

FIG. 1 is a diagram showing a relationship between a vertical burn-down rate and a horizontal burn-down rate.

FIG. 2 is a diagram showing a relationship between a vertical burning rate after the expansion pressure becomes 0 and an extrusion current.

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[Procedure amendment]

[Submission date] August 18, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0019

[Correction method] Change

[Correction content]

[0019]

Example 1 A movable wall type carbonization test furnace having a furnace width of 400 mm, a furnace height and a furnace length of 600 mm, which was heated on both sides, was carbonized to dry carbonaceous materials as shown in Table 1, burned down in the vertical direction, and burned in the horizontal direction. The decrease, the expansion pressure, and the change with time of the temperature at the center of the carbonization chamber were measured. At this time, the crushed particle size of coal is 3 mm or less and 85%, the charging density is 0.80 t / m ^{3 on} a dry coal basis, and the water content is 5%. From this test, the temperature of the center of the carbonization chamber is JIS-M-8801.
Immediately after reaching the re-solidification temperature defined by
It was confirmed that Further, the vertical burn rate and the horizontal burn rate were obtained from the vertical burn rate and the horizontal burn rate after the expansion pressure became zero. The relationship between the two is shown in FIG. From this, it was found that the two values were almost equal, and the vertical burn-off after the expansion pressure became 0 was able to evaluate the horizontal burn-off.

[Procedure Amendment 2]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 1

[Correction method] Change

[Correction content]

[Figure 1]

Claims (3)

[Claims] 1. A mixed coal for charging a coke oven is subjected to carbonization in a double-sided heating type test coke oven before charging to an actual coke oven, and the displacement (expansion or contraction amount) of the height of the charged coal or the coke during carbonization. The temperature at the center of the furnace width direction, the center of the furnace length direction and the center of the furnace height direction is measured by JIS
-The amount of shrinkage in the height direction after reaching the re-solidification temperature of the coal blend defined by M-8801 until the end of carbonization is defined by the ratio of the amount of shrinkage in the height direction and the coal charging height. A method for operating a coke oven, which comprises charging the blended coal into an actual coke oven after confirming that the vertical burning rate is 2% or more. 2. The mixed coal for charging the coke oven is carbonized in a double-sided heating type test coke oven capable of measuring the expansion pressure in the coal carbonization process before charging the actual coke oven, and the coal or the coke charged during carbonization. The height displacement (expansion or contraction amount) of the coke oven is continuously measured, and the contraction amount in the height direction from when the expansion pressure acting on the furnace wall of the coke oven becomes 0 to the end of carbonization is calculated. A coke oven is characterized by charging the blended coal into an actual coke oven after confirming that the vertical burning rate defined by the ratio between the amount and the coal charging height is 2% or more. Operating method. 3. The mixed coal for charging a coke oven is carbonized in a double-sided heating type test coke oven before charging the actual coke oven, and the gap between the furnace wall and the surface of coal or coke in contact with the furnace wall during carbonization is set. After continuously measuring the change, it was confirmed that the horizontal burning rate defined by the ratio of the size of the gap at the end of carbonization and the furnace width / 2 was 2% or more, and the blended coal was charged into the actual coke oven. A method of operating a coke oven, characterized by: