JP2010265382A - Coke oven carbonization chamber furnace wall state evaluating method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a coke oven carbonization chamber furnace wall state evaluating method by which extrusion resistance causing extrusion trouble is suitably grasped and a furnace wall state after operation of empty kiln can be easily evaluated. <P>SOLUTION: The coke oven carbonization chamber furnace wall state evaluating method by which a furnace wall state of a coke oven carbonization chamber is evaluated includes steps for: measuring extrusion power values P<SB>n</SB>to extrusion frequencies n after operation of empty kiln of a carbonization chamber 1; performing classification into a decreasing interval where extrusion power values P<SB>n</SB>are decreased with increase of extrusion frequencies n and an increasing interval where extrusion power values P<SB>n</SB>are increased with increase of extrusion frequencies n after the decreasing interval; calculating a furnace wall state value A<SB>D</SB>and an extrusion power decreasing index k<SB>n</SB>of the following approximation formula (1) using the extrusion frequencies n and the extrusion power values P<SB>n</SB>in the decreasing interval; and evaluating the furnace wall state by using the calculated furnace wall state value A<SB>D</SB>. P<SB>n</SB>=A<SB>D</SB>×EXP(-k<SB>n</SB>×n) (1). <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a coke oven carbonization chamber furnace wall state evaluation method for evaluating a furnace wall state of a coke oven carbonization chamber.

  In general, a coke oven has a heat storage chamber in the lower part, and a carbonization chamber (hereinafter sometimes referred to as a kiln) and combustion chambers are arranged in the upper part. The heat storage chamber can preheat fuel gas and air and supply them to the combustion chamber. The combustion chamber combusts the supplied fuel gas and air, transfers heat indirectly to the carbonization chamber adjacent to both sides through the furnace wall, and dry-coalizes the coal in the carbonization chamber for coking.

  The coke after the carbonization is extruded by an extruder and discharged from the carbonization chamber. However, an extrusion trouble occurs due to various causes at the time of the extrusion operation by the extruder. As a particularly important cause, there is a resistance caused by the carbon adhering to the furnace wall of the coke oven carbonization chamber during the extrusion, and this extrusion resistance causes an extrusion trouble that stops the extrusion ram.

  Therefore, in order to reduce or eliminate the extrusion trouble, the carbon adhering to the furnace wall must be removed. Currently, there is an empty kiln as a method for removing carbon adhering to the furnace wall. An empty kiln is an operation in which a charcoal chamber is left for several hours or several cycles without charging coal while opening a charge port to the charcoal chamber and allowing air to flow from the charge port. Here, the cycle means a series of operations from coal charging to coke extrusion. By carrying out an empty kiln, carbon adhering to the furnace wall of the carbonization chamber can be burned out and removed.

  On the other hand, if an empty kiln is performed, the carbonization chamber furnace wall (brick) will be damaged due to cooling by the inflow of air. If the empty kiln is repeatedly performed, the carbonization chamber furnace wall is damaged, the extrusion resistance is increased, and it causes the extrusion trouble like the above-mentioned adhered carbon. For this reason, when the damage caused by the implementation of an empty kiln is large, the furnace wall is repaired by thermal spraying.

  As a method for evaluating the state of the furnace wall of the carbonization chamber after the implementation or repair of these empty kilns, for example, evaluation by visual observation by an operator is performed. However, visually observing the inside of a furnace wall having a furnace length of 15 m or more and a furnace height of 6 m or more not only has poor work efficiency, but can only be qualitatively evaluated.

  Therefore, Patent Document 1 below discloses a method for obtaining a carbonization chamber profile using a non-contact distance meter or the like and indexing the state of the furnace wall based on the profile. Further, in the cited reference 2 below, the distance between the furnace walls at a plurality of positions in the longitudinal direction at an arbitrary height of the carbonization chamber is measured, and the distance between the measured furnace wall distances is calculated based on the obtained displacement line between the measured furnace wall distances. A method for diagnosing the state of the furnace wall in the coking chamber by obtaining a leveled displacement line and comparing the measured displacement distance between the furnace wall distances and the leveled displacement line is disclosed. Moreover, in the following Patent Document 3, furnace wall three-dimensional profile data is generated using an image signal obtained by a wall surface observation device, and resistance received by extruded coke is indexed using the furnace wall three-dimensional profile data. The calculated resistance index.

JP 2001-294867 A JP 2003-183661 A JP 2008-201993 A

  However, the methods disclosed in the cited documents 1 to 3 directly measure or observe the furnace wall of the carbonization chamber, and it takes time to evaluate the uneven state of the entire furnace wall. Moreover, although the method of the cited documents 1-3 shows the furnace wall state, such as damage of a furnace wall, since it does not show the extrusion resistance resulting from a furnace wall state directly, it has the extrusion trouble by extrusion resistance. Cannot judge properly. As mentioned above, extrusion trouble may occur depending on the damage of the furnace wall, and the furnace wall condition such as damage is evaluated to reduce the influence on the extrudability, and repair of the furnace wall etc. Treatment is performed.

  The present invention has been made in view of the above circumstances, and the problem is that a coke oven that can appropriately grasp the extrusion resistance causing the extrusion trouble and can easily evaluate the furnace wall state after the empty kiln is implemented. It is to provide a carbonization chamber furnace wall condition evaluation method.

In order to solve the above problems, the coke oven carbonization chamber furnace wall state evaluation method of the present invention,
A coke oven carbonization chamber furnace wall state evaluation method for evaluating the coke oven carbonization chamber wall state,
Measuring an extrusion power value P _n with respect to the number of extrusions n after performing an empty kiln in the carbonization chamber;
A step of dividing into a decrease section in which the extrusion power value P _n decreases with an increase in the number of extrusions n, and an increase section in which the extrusion power value P _n increases with an increase in the number of extrusions n after this decrease section;
Using the values of the extrusion number n and the extrusion power value P _n of the reduced section, determining a furnace wall state value A _D and extrusion power reduction index k _n of the following approximate expression (1),
And a step of evaluating the furnace wall state using the obtained furnace wall state value _AD .
_{P n = A D × EXP (} -k n × n) (1)

The effect | action and effect of the coke oven carbonization chamber furnace wall state evaluation method by such a structure are demonstrated. Extrusion power value P _n relative to the extrusion number n after empty kiln implementation typically shows changes such as the graph of FIG. Here, the extrusion power value _Pn is a power value necessary for extruding the coke after dry distillation from the carbonization chamber, and can be said to indicate the extrusion resistance at the time of coke extrusion. Immediately after the implementation of the empty kiln, the carbon adhering to the furnace wall burns off, and the damaged part (dent) of the furnace wall becomes clear, and the extrusion resistance increases due to the depression, and as a result, the extrusion power value P _n increases. . After that, when repeated extrusion, carbon adheres to the damaged portion of the furnace wall, since the recess of the damaged portion is gradually filled by carbon, with increasing extrusion times n, extrusion resistance decreases, the extrusion power value P _n decrease I will do it. In the present invention, such a section where the extrusion power value P _n decreases as the number of extrusions n increases is defined as a decrease section. If extrusion is further repeated after this lowering section, the carbon is locally stretched, and the stretched carbon becomes extrusion resistance. Therefore, as the number of extrusions n increases, the extrusion resistance increases and the extrusion power value _Pn increases. Go. In the present invention, a section in which the extrusion power value P _n increases as the number of times of extrusion n increases is defined as a rising section.

Using the values of the number of extrusions n and the extrusion power value P _n in the lowering section among the lowering section and the rising section thus divided, the furnace wall state value _AD and the extrusion power lowering index of the approximate expression (1) are used. determine the k _n. As described above, in the lowered section, the furnace wall state itself greatly affects the extrusion resistance. However, as shown in FIG. 3, at the beginning of the lowering section (when the number of extrusions n is small), factors such as furnace temperature and coal properties are also affected in addition to the furnace wall state, and the extrusion power value P _n varies. Even when the extrusion power value _Pn itself is used, it is difficult to properly grasp the extrusion resistance due to the furnace wall state. Further, in the decreasing section, the section where the extrusion power value _Pn stably decreases is a state in which carbon adheres to the damaged portion (dent) of the furnace wall and is gradually smoothed. The value _Pn cannot be said to indicate the state of the furnace wall after the empty kiln.

Therefore, in the present invention, by using the furnace wall state value _AD obtained by the approximate expression (1), factors other than the furnace wall state are suppressed, and the extrusion resistance due to the furnace wall state after the empty kiln is appropriately grasped. It becomes possible.

Further, the fact that the furnace wall state value _AD is large indicates that the extrusion power value is large and the extrusion resistance is large since the first extrusion after the empty kiln is performed. On the contrary, the fact that the furnace wall state value _AD is small indicates that the extrusion power value is small and the extrusion resistance is small since the first extrusion after the empty kiln. Moreover, since the extrusion power value is large when the furnace wall is greatly damaged, it can be said that the magnitude of the damage can be evaluated by the magnitude of the furnace wall state value _AD . In other words, the furnace wall state can be easily evaluated by using the furnace wall state value _AD .

  In addition, after carrying out an empty kiln in this invention, not only after implementing an empty kiln but also after performing an empty kiln and also performing repairs, such as thermal spraying.

The coke oven carbonization chamber furnace wall state evaluation method according to the present invention preferably further includes a step of ranking the furnace wall state value _AD of each carbonization chamber.

Since the coke oven is provided with a plurality of carbonization chambers, it is possible to easily determine the priority order for strengthening the repair of the furnace wall among the plurality of carbonization chambers by ranking the furnace wall state values _AD of the respective carbonization chambers. be able to.

Cross section of coking oven coking chamber Sectional view of carbonization chamber viewed in the extrusion direction Graph showing transition of extrusion power value after empty kiln implementation

  Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 shows a cross-sectional view of a carbonization chamber 1 of a coke oven. In general, a plurality of coking chambers 1 are arranged in a coke oven. Here, for convenience of explanation, only one coking chamber 1 will be described.

  A charging vehicle 2 for charging coal into the carbonizing chamber 1 is movably provided at the upper portion of the carbonizing chamber 1. A hopper group H including a plurality of hoppers is mounted on the charging vehicle 2, and coal filled in each hopper can be charged into the carbonization chamber 1. Charging the coal into the carbonizing chamber 1 is performed through charging ports 3 provided in the upper part of the carbonizing chamber 1 corresponding to the hoppers. Further, in addition to the charging port 3, a rising pipe 4, which is a gas escape path, is provided at the upper part of the carbonization chamber 1. Note that the number of loading ports 3 can be set as appropriate.

  Combustion chambers are provided on both sides of the carbonization chamber 1, and the coke C is produced by dry distillation of the coal charged into the carbonization chamber 1 by the combustion heat generated by burning the combustion gas in the combustion chamber. Can do. Although not shown in FIG. 1, the combustion chambers are respectively provided in the back direction and the front direction of the carbonization chamber 1 in FIG. 1.

  When the carbonization of the coal charged in the carbonization chamber 1 is completed, the furnace lids 5 and 6 disposed at the kilns on both sides of the carbonization chamber 1 in FIG. 1 are opened. An extruder 7 is provided on one side of the kiln, and the coke C in the carbonization chamber 1 is discharged from the other kiln (discharge port) by the extruder 7. Here, it is assumed that the extruder 7 is arranged on the left side of the furnace lid 5 in FIG. 1 and the kiln opening in which the furnace cover 6 is arranged is a discharge port.

<Coating chamber furnace wall condition evaluation method>
When the coke C is extruded from the carbonization chamber 1 by the extruder 7, extrusion resistance is added to the extruder 7. In the present embodiment, the extrusion power value _Pn , which is the power value (kw) of the extruder 7 required when the coke C is extruded from the carbonization chamber 1, is measured. The extrusion power value _Pn is a value corresponding to the extrusion resistance. The power value of the extruder 7 varies depending on the position of the carbonizing chamber 1 in the extrusion direction (left-right direction in FIG. 1) in the extrusion process, but in this embodiment, the maximum value in one extrusion process. The power value is set as the extrusion power value _Pn .

In this embodiment, after performing an empty kiln with respect to the carbonization chamber 1, a series of operations from the charging of coal to the extrusion of coke C are repeated, and the number of repetitions, that is, the extrusion power value P _n for the number of extrusions _n. Measure. In addition, after implementing an empty kiln with respect to the carbonization chamber 1, spraying may be performed for repair of a furnace wall.

Extrusion power values P _n for extrusion number n after empty kiln performed for coking chamber 1, as described above, usually, shows changes such as the graph of FIG. The horizontal axis represents the number of extrusions n (times), and the vertical axis represents the extrusion power value P _n (kw). The vertical axis in FIG. 3 is a logarithmic scale.

The reason why the extrusion power value P n with respect to the number of extrusions _n changes as shown in FIG. 3 will be described with reference to FIG. FIG. 2 is a cross-sectional view of the carbonization chamber 1 as viewed in the extrusion direction. The furnace wall 10 of the carbonization chamber 1 is formed, for example, by stacking refractory bricks.

Immediately after the implementation of the empty kiln, as shown in FIG. 2A, the carbon adhering to the furnace wall 10 is burned off, and the damaged portion 10a of the furnace wall 10 becomes clear. Such a damaged part 10a is caused by repeated empty kilns. When the coke C is pushed out due to the dent of the damaged portion 10a, the extrusion resistance increases, and as a result, the extrusion power value P _n increases.

Thereafter, when the extrusion is repeated, as shown in FIG. 2B, the carbon 11 adheres to the damaged portion 10 a of the furnace wall 10, and the dent of the damaged portion 10 a is gradually filled with the carbon 11. Since the dent is filled with the carbon 11 and the furnace wall 10 is smoothed, the extrusion resistance decreases and the extrusion power value P _n decreases as the number of extrusions n increases. In the present embodiment, a section in which the extrusion power value P _n decreases as the number of extrusions n increases is referred to as a decrease section.

When extrusion is further repeated after the lowering section, as shown in FIG. 2 (c), the carbon 11 is locally projected and the projected carbon 11 becomes extrusion resistance, so that the extrusion resistance increases as the number of extrusions n increases. Then, the extrusion power value _Pn increases. In the present embodiment, such a section in which the extrusion power value P _n increases as the number of times of extrusion n increases is referred to as a rising section.

Of this way a reduced section which is divided by rise zone, using the values of the extrusion number n and the extrusion power value P _n in reducing section, the furnace wall state value A _D and extrusion power of the following approximate expression (1) seek a reduction index _{k n.} The graph of the approximate expression (1) is shown by a straight line in FIG. 3, and the furnace wall state value _AD is a y-intercept of this straight line. In addition, the boundary between the decrease section and the increase section of the extrusion power value _Pn is calculated when the approximate expression (1) is calculated for each number of extrusions after the empty kiln, and the correlation coefficient value of the expression shows the maximum value. The number of extrusions.
_{P n = A D × EXP (} -k n × n) (1)

In the lowered section, the furnace wall condition itself has a great influence on the extrusion resistance. However, as shown in FIG. 3, at the beginning of the lowering section (when the number of extrusions n is small), factors such as furnace temperature and coal properties are also affected in addition to the furnace wall state, and the extrusion power value P _n varies. There is.

Further, in the lowering section, the section where the extrusion power value _Pn stably decreases is a state in which the carbon 11 adheres to the recess of the furnace wall 10 and is gradually smoothed as described above. It cannot be said that the extrusion electric power value _Pn of indicates the furnace wall state after the empty kiln or after spraying repair.

Therefore, by using the furnace wall state value _AD obtained by the approximate expression (1), factors other than the furnace wall state are suppressed, and the extrusion resistance due to the initial furnace wall state after the empty furnace is appropriately grasped. Is possible.

The fact that the furnace wall state value _AD is large indicates that the extrusion power value _Pn is large and the extrusion resistance is large since the first extrusion after the empty kiln. Conversely, the fact that the furnace wall state value _AD is small indicates that the extrusion power value _Pn is small and the extrusion resistance is small from the first extrusion after the empty kiln is implemented. Moreover, since the extrusion electric power value _Pn is large when the damage of the furnace wall 10 is large, it can be said that the magnitude of damage can be evaluated by the magnitude of the furnace wall state value _AD . That is, by using the furnace wall state value _AD , the furnace wall state after the empty furnace can be easily evaluated.

Moreover, when the furnace wall state value _AD is large, poor extrusion frequently occurs after the empty kiln is implemented. If an extrusion failure occurs, there is a high risk of clogging that prevents coke C from being discharged from the carbonization chamber 1 even if pushed by the extruder 7. In order to reduce the risk of clogging, special measures such as reducing the amount of coal charged (adjustment charging) are implemented, which increases the administrative burden. Therefore, repairing after the empty kiln is carried out and the furnace wall state value _AD is lowered, thereby reducing the risk of clogging, reducing the adjustment charging, and reducing the administrative burden. It leads to improvement.

Further, even if the furnace wall state value _AD is large, as described above, the extrusion power value _Pn decreases as the number of extrusions n increases, but when the furnace wall state value _AD is large. It is inferred that repairs such as thermal spraying after the empty kiln were not sufficient. Therefore, the thermal spraying after the next empty kiln needs to be enhanced with special care. As described above, by evaluating the furnace wall state using the furnace wall state value _AD , it is possible to easily determine the magnitude of damage to the furnace wall of the carbonization chamber, the necessity for repair, and the like.

<Another embodiment>
In the above embodiment, the extrusion power value _Pn is measured as representing the extrusion resistance at the time of extrusion of the coke C, but the current value and reaction force value at the time of extrusion of the motor of the extruder 7 may be measured.

DESCRIPTION OF SYMBOLS 1 Carbonization chamber 3 Charger 7 Extruder 10 Furnace wall 10a Damaged part 11 Carbon C coke

Claims (2)

A coke oven carbonization chamber furnace wall state evaluation method for evaluating the coke oven carbonization chamber wall state,
Measuring an extrusion power value P _n with respect to the number of extrusions n after performing an empty kiln in the carbonization chamber;
A step of dividing into a decrease section in which the extrusion power value P _n decreases with an increase in the number of extrusions n, and an increase section in which the extrusion power value P _n increases with an increase in the number of extrusions n after this decrease section;
Using the values of the extrusion number n and the extrusion power value P _n of the reduced section, determining a furnace wall state value A _D and extrusion power reduction index k _n of the following approximate expression (1),
A step of evaluating the furnace wall state using the obtained furnace wall state value _AD , and a coke oven carbonization chamber furnace wall state evaluation method.
_{P n = A D × EXP (} -k n × n) (1) The coke oven coking chamber furnace wall state evaluation method according to claim 1, further comprising a step of ranking the furnace wall state value _AD of each coking chamber.

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