JP2006273971A - Apparatus and method for managing operation of coke oven - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve stable operation of a coke oven as a whole by identifying a cause of elevation of extruding force while extruding coke from a carbonization chamber and by carrying out repair or adjustment on the basis of the identified cause. <P>SOLUTION: An apparatus for managing operation of a coke oven comprises a means for calculating a present elevation rate (A) that shows the elevation rate of extruding force during present repair period with regard to each carbonization chamber, a means for calculating a past average elevation rate (B) which shows an average of elevation rates of extruding forces during a plurality of past repair periods with regard to each carbonization chamber, a means for calculating an increase rate (C=A/B) with regard to each carbonization chamber, and a determination means. When the calculated increase rate (C) of one of the carbonization chambers exceeds a predetermined value a<SB>1</SB>, the determination means determines whether the increase of the extruding force elevation rate of the carbonization chamber is a characteristic tendency of the carbonization chamber or a tendency of the whole coke oven. When the increase is determined to be the characteristic tendency of the carbonization chamber, the apparatus instructs to repair the carbonization chamber. When the increase is determined to be the tendency of the whole coke oven, the apparatus instructs to adjust a coal blend charged into the coke oven. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an operation management device and an operation management method for a coke oven that carbonizes coal into coke.

  In a coke oven in which coal is carbonized into coke, combustion chambers and carbonization chambers are alternately arranged, and the combustion chambers and the carbonization chamber are partitioned by a refractory brick partition wall (furnace wall brick). The charcoal chamber is charged with coal loaded on the hopper of the charging vehicle from above. Coal is dry-distilled with heat from combustion chambers arranged on both sides of the carbonization chamber to produce coke. The carbonized coke is pushed from the side by the extrusion ram of the extruder and discharged from the carbonization chamber.

  Coke oven wall bricks are damaged over time due to past operational history. Moreover, as the operation continues, carbon adheres to and accumulates on the surface of the furnace wall brick.

  Such damage to the furnace wall bricks, adhesion of carbon, and deposition cause an increase in extrusion force when coke is extruded. Therefore, when the value of the extrusion force increases beyond the control standard value, the operation in the carbonization chamber is stopped and the carbonization chamber is repaired.

In recent years, various furnace body diagnosis systems have been proposed for qualitatively or quantitatively diagnosing the damage of bricks in a coke oven. For example, Japanese Patent Application Laid-Open No. 11-131669 (Patent Document 1) describes a coke oven based on a deviation between an estimated pushing force calculated on the assumption that no furnace wall damage has occurred and a measured pushing force actually measured. A method for estimating the damage status of a coke oven is described, in which damage to the furnace wall is estimated, thereby determining the need for furnace wall repair. According to the coke oven damage state estimation method, the coke oven furnace wall damage state can be estimated while eliminating unstable factors such as operator intuition.
Japanese Patent Laid-Open No. 11-131069

  The technique of the above-mentioned patent document 1 can estimate the damage state of the furnace wall of the coke oven from the pushing force of each carbonization chamber for each carbonization chamber, and thereby the necessity of repairing the furnace wall for each carbonization chamber. It can be judged.

  However, the cause of increasing the extrusion force when extruding coke from the carbonization chamber is the cause specific to the carbonization chamber and the operating conditions of the entire coke oven, such as the properties of the coal charged into the carbonization chamber, etc. There is. And in order to stabilize the operation, it is necessary not only to repair each individual carbonization chamber, but also to identify the cause of the pushing force increase to some extent, and to perform appropriate repair or adjustment based on the cause. is there. And if the cause is the operating conditions of the coke oven as a whole, it is necessary to review it.

  Therefore, the present invention identifies the cause of the increase in the extrusion force when coke is extruded from the carbonization chamber, performs appropriate repair or adjustment based on the cause, and stabilizes the operation of the entire coke oven. An object of the present invention is to provide an operation management apparatus and an operation management method for a coke oven that can be achieved.

  The present inventor has found that a certain repair cycle exists in each carbonization chamber constituting the coke oven by analyzing a large number of carbonization chamber extrusion force data over a long period of time. Furthermore, it has been found that the repair cycle for each carbonization chamber shows a slightly different behavior and varies depending on the state of the furnace wall of each carbonization chamber and the properties of the coal charged in the carbonization chamber. It was.

  In other words, by comparing and examining the transition of the extrusion force data of each carbonization chamber with the data in the current and past repair cycles, the presence or absence of an abnormality in the furnace wall of the carbonization chamber and the cause of the abnormality can be determined for each individual carbonization chamber. It has been found that it is possible to determine whether or not the cause is an abnormality in the coke oven as a whole.

  The present invention has been made based on the above findings and has the following characteristics.

[1] An operation management device for performing operation management of a coke oven that carbonizes coal into coke,
For each carbonization chamber, a current rate of increase calculation means for calculating the current rate of increase (A), which is the rate of increase of the pushing force within the period after the nearest repair that is within the current repair cycle;
For each carbonization chamber, a past average increase rate calculating means for calculating a past average increase rate (B) that is an average of the increase rate of the pushing force within the past multiple repair cycles;
An increase rate calculating means for calculating an increase rate (C = A / B) of the current increase rate (A) with respect to the past average increase rate (B) for each carbonization chamber;
Increase rate calculated by the increase rate calculating means (C), when the coking chamber exceeding a predetermined value a _1, which is defined in the range of 1.4 to 3 appeared, the extrusion force in the carbonization chamber An increasing tendency judging means for judging whether the increase in the rate of increase is a tendency specific to the coking chamber or the whole coke oven;
As a result of the judgment by the increasing tendency judging means, when it is judged that the tendency is unique to the coking chamber, a repair instruction for the coking chamber is given, and when it is judged that the whole coke oven is trended, the coke oven is charged. And an instruction means for instructing adjustment of the blended coal.

In [2] [1], determined in increasing determining means, increase rate (C) is the rate of increase in two or more of the coking chamber of 3 minutes in the carbonization chamber other than the carbonization chamber exceeds a predetermined value a ₁ is the predetermined when the value a ₁ 1.2, which is set from a small value 2.8 at a predetermined value a ₂ or more that is determined within the scope of determining the trend of the entire coke oven, otherwise operation management apparatus characterized by increased rate (C) is determined to carbonization chamber inherent tendency to exceed the predetermined value a ₁ is the.

[3] The operation management apparatus according to [1] or [2], wherein the blending coal adjustment instruction in the instruction means when it is determined that the coke oven as a whole has a tendency is performed as follows.
(1) The average pushing force (D) of the coking oven in the coke oven in the nearest period is 1. The average pushing force (E) of the coking oven in the coke oven in the blending rate stabilization period excluding the nearest period. In the case of 1 times or more, the following adjustment (a) or (b) is performed.
(A) When there is a management item exceeding the management standard value of the coal blend, a predetermined correction is made so that the management item exceeding the management standard value falls within the management standard value.
(B) When there is no management item exceeding the management reference value, adjustment is performed to reduce the blending rate of the specific brand of blended coal.
(2) When the average pressing force (D) is less than 1.1 times the average pressing force (E), adjustment is performed to reduce the content of volatile matter in the blended coal.

[4] An operation management method for performing operation management of a coke oven that carbonizes coal into coke,
For each carbonization chamber, a current rate of increase calculation step for calculating the current rate of increase (A), which is the rate of increase of the pushing force within the period after the nearest repair that is within the current repair cycle;
For each carbonization chamber, a past average increase rate calculating step for calculating a past average increase rate (B) that is an average of the increase rate of the pushing force within a plurality of past repair cycles;
An increase rate calculating step for calculating an increase rate (C = A / B) of the current increase rate (A) with respect to the past average increase rate (B) for each carbonization chamber;
The increase rate calculation increase rate calculated by step (C), when the coking chamber exceeding a predetermined value a _1, which is defined in the range of 1.4 to 3 appeared, the extrusion force in the carbonization chamber An increasing tendency judgment step for judging whether the increase in the rate of increase is a tendency specific to the coking chamber or the tendency of the whole coke oven;
As a result of the determination in the increasing tendency determination step, if it is determined that the tendency is specific to the coking chamber, a repair instruction for the coking chamber is issued, and if it is determined that the tendency of the entire coke oven is determined, the coke oven is charged. An operation step of instructing adjustment of the blended coal.

In [5] above [4], determined in increasing determination step, the increase rate (C) is the rate of increase in two or more of the coking chamber of 3 minutes in the carbonization chamber other than the carbonization chamber exceeds a predetermined value a ₁ is the predetermined when the value a ₁ 1.2, which is set from a small value 2.8 at a predetermined value a ₂ or more that is determined within the scope of determining the trend of the entire coke oven, otherwise operation management method increase rate (C) is characterized in that it is determined that the carbonization chamber inherent tendency to exceed the predetermined value a ₁ is the.

[6] The operation management method according to the above [4] or [5], wherein the blending coal adjustment instruction in the instruction step when it is determined that the entire coke oven is in the trend is performed as follows.
(1) The average pushing force (D) of the coking oven in the coke oven in the nearest period is 1. The average pushing force (E) of the coking oven in the coke oven in the blending rate stabilization period excluding the nearest period. In the case of 1 times or more, the following adjustment (a) or (b) is performed.
(A) When there is a management item exceeding the management standard value of the coal blend, a predetermined correction is made so that the management item exceeding the management standard value falls within the management standard value.
(B) When there is no management item exceeding the management reference value, adjustment is performed to reduce the blending rate of the specific brand of blended coal.
(2) When the average pressing force (D) is less than 1.1 times the average pressing force (E), adjustment is performed to reduce the content of volatile matter in the blended coal.

  According to the present invention, it is possible to identify the cause of the increase in the extrusion force when coke is extruded from the carbonization chamber, and by performing appropriate repair or adjustment based on the cause, the operation of the coke oven as a whole can be stabilized. An operation management apparatus and an operation management method for a coke oven that can be achieved are provided.

  Hereinafter, an example of the best mode for carrying out the present invention will be described.

  FIG. 1 is a functional block diagram illustrating an example of an operation management apparatus for performing operation management of a coke oven that is carbonized to produce coke according to the present invention. FIG. 2 shows an example of a processing flow in each means according to the present invention.

Hereinafter, description will be made with reference to FIGS. 1 and 2. As shown in FIG.1 and FIG.2, the operation management apparatus 1 which concerns on this invention is the present rise which is an increase rate of the extrusion force in the period after the nearest repair which becomes in the present repair period for every carbonization chamber. The current rate of increase calculation means 10 for calculating the rate (A), and the past average rate of increase for calculating the past average rate of increase (B), which is the average of the rate of increase in the pushing force within the past multiple repair cycles, for each carbonization chamber Rate calculating means 20, an increasing rate calculating means 30 for calculating an increasing rate (C = A / B) of the current increasing rate (A) with respect to the past average increasing rate (B) for each carbonization chamber, and the increasing rate calculating means 30 increase rate calculated by (C) is, if the carbonization chamber exceeding a predetermined value a _1, which is defined in the range of 1.4 to 3 appeared, the rate of increase of the extrusion force in the carbonization chamber Increase to determine whether the increase in coal is a trend specific to the coking chamber or the overall coke oven When it is determined as a tendency specific to the coking chamber as a result of the determination by the additional tendency determining means 40 and the increasing tendency determining means 40, a repair instruction for the coking chamber is given, and the tendency of the coke oven is determined as a whole Has an instruction means 50 for instructing adjustment of the blended coal charged into the coke oven. The predetermined value a ₁ is, by changing the capacity utilization and management level, which is changed in the range of 1.4 to 3, usually, for example, be 1.5.

  For example, a computer or the like can be used for the operation management apparatus 1.

  Here, the extrusion force measured for each of the carbonization chambers means that the coke co-distilled in the carbonization chamber is pushed from the side by the extrusion ram of the extruder and discharged from the carbonization chamber once. Refers to the output data of the maximum extrusion force in the extrusion operation. When a large amount of carbon or the like adheres to the furnace wall brick of the carbonization chamber or damage to the furnace wall brick of the carbonization chamber occurs, that portion becomes resistance and the pushing force of the ram increases.

  The data that can be used as the extrusion force data includes, for example, the average value of the extrusion force in one extrusion operation, and the extrusion force in a specific range during the extrusion operation, in addition to the maximum value in the one extrusion operation. Data values such as values, maximum values and average values can also be used. Further, for example, values such as a current value, a power value, and a torque value of the driving motor of the extrusion ram can be used.

  Hereinafter, each of the means will be described.

[Current increase rate calculating means 10]
In the present increase rate calculation means 10, the coke oven is configured and the increase rate of the pushing force within the period from the nearest repair to the present within the current repair cycle for each active carbonization chamber. A certain current rate of increase (A) is calculated.

  Here, the data of the extrusion force is, for example, from the operation management system 2 that manages the operation of the coke oven, or the like in one extrusion operation from the extrusion load data measured for each carbonization chamber of the coke oven. It can be obtained by taking in the extrusion force data which is the maximum value.

The current rate of increase (A) can be calculated as follows from the most recent repaired pushing force data A1 and the nearest pushing force data A2.
Current rate of increase (A) = nearest extrusion force data A2 / extension force data A1 after repair
As the value of the pushing force data A1 after the nearest repair, it is preferable to use the pushing force data after a predetermined number of days, for example, about 1 to 4 weeks after the repair, instead of the value immediately after the repair. Immediately after repairing the furnace wall in the carbonization chamber, the surface of the brick is exposed, and the extrusion force tends to increase. This is because as the operation continues, the surface of the furnace wall brick becomes thinly coated with carbon or the like, and when it becomes effective as a lubricant, the extrusion force is reduced and stabilized. The period from immediately after the repair to stabilization is the number of days.

  Here, the data of the current rate of increase (A) calculated for each coking chamber constituting the coke oven is stored in a database for each coking chamber.

[Previous average rate of increase calculation means 20]
In this past average increase rate calculating means 20, a past average increase rate (B) that is an average of the increase rate of the extrusion force within the past multiple repair cycles for each coking chamber that constitutes the coke oven and is in operation. Is calculated. Here, the average of the increase rate of the extrusion force within the plurality of past repair cycles means, for example, the average of the increase rate of the extrusion force in the past repair cycle in the carbonization chamber for two to three times.

Further, the rate of increase in the pushing force within the past repair cycle is calculated as follows from the pushing force data B1 after the repair within one repair cycle and the pushing force data B2 just before the repair. be able to.
Extrusion force increase rate = extrusion force data B2 just before repair / extrusion force data B1 after repair
As described above, as the value of the extrusion force data B1 after the repair, it is preferable to use the extrusion force data after a predetermined number of days, not the value immediately after the repair.

  The average rate of increase in the past (B) is calculated by averaging the rate of increase in the extrusion force thus determined for the past two to three times.

  Here, the data of the past average rate of increase (B) calculated for each coking chamber constituting the coke oven is stored in a database for each coking chamber.

[Increase rate calculation means 30]
In the present increase rate calculating means 30, the current increase rate calculating means for the past average increase rate (B) calculated by the past average increase rate calculating means 20 for each coking chamber that is in a coke oven and is in operation. The increase rate (C) of the current increase rate (A) calculated in 10 is calculated as follows.
Rate of increase (C) = Current rate of increase (A) / Previous average rate of increase (B)
Here, the data of the increase rate (C) calculated for each coking chamber constituting the coke oven is stored in a database for each coking chamber.

[Increase tendency determination means 40]
If in this increasing trend determination means 40, the increase rate calculated by the increase rate calculation means 30 (C) is, the carbonization chamber appeared greater than the predetermined value a ₁ is elevated extrusion force at the carbonization chamber Judge whether the increase in rate is a tendency unique to the coking chamber or the whole coke oven.

Here, the judgment, the increase rate (C) is the rate of increase in two or more of the coking chamber of 3 minutes in the carbonization chamber other than the carbonization chamber exceeds a predetermined value a ₁ is the predetermined value a ₁ determines that more 1.2 from the entire coke oven in the case of a predetermined value a ₂ or more that is determined in the range of 2.8 tend to be set as a small value, the rate of increase otherwise (C) There it can be determined that the carbonization chamber inherent tendency to exceed the predetermined value a _1. The predetermined value a ₂ is a value smaller than the predetermined value a ₁ and is changed within a range of 1.2 to 2.8 due to a change in the operation level and the management level. Usually, it can be set to 1.3, for example.

If more than two-thirds of the coking chamber constituting the coke oven is of the same tendency, that is, when the increase rate of the carbonization chamber of said predetermined value a ₂ or more, the effect due to factors that are common overall coke oven This is because it is reasonable to think.

Further, when the carbonization chamber increasing rate of carbonization chamber becomes the predetermined value a ₂ or more is less than 2 thirds of the carbonization chamber increase rate (C) exceeds the predetermined value a ₁ It is reasonable to judge it as an inherent tendency.

[Instruction means 50]
In the instruction unit 50, the increase determination means 40 a result of the determination by the repair instructions of the coking chamber when the increase rate (C) is determined to carbonization chamber inherent tendency to exceed the predetermined value a ₁ When it is judged that the tendency of the coke oven as a whole is instructed, the adjustment instruction of the blended coal charged into the coke oven is given.

Here, the repair instructions of the coking chamber which is performed when the increase rate (C) is determined to carbonization chamber inherent tendency to exceed the predetermined value a _1, inspection of the coking chamber or combustion chamber, And it is performed according to a predetermined repair execution instruction. Examples of the predetermined repair type include, for example, “carbon removal” in which the carbon deposited in the furnace wall brick in the carbonization chamber is dropped by heating in a state where no coal is charged in the carbonization chamber, and the damaged portion of the furnace wall brick in the carbonization chamber There is a “furnace wall repair (for example, spraying or spraying)”. The type of repair is not limited to the above two types, but may be a combination of the above two types, and the repair method may be determined from three or more types of repairs including those other than the above two types. Anyway.

Moreover, the adjustment instruction | indication of the blended coal charged into the coke oven performed when it is judged as the tendency of the whole coke oven can be performed like (1) and (2) below.
(1) A blending rate stabilization period in which the average extruding force (D) of the coking oven in the entire coke oven within the past day is small in fluctuation of the blending rate of the blended coal excluding the nearest period. For example, when the average extrusion force (E) of the carbonization chamber of the whole coke oven within the past week is 1.1 times or more, the following adjustment (a) or (b) is performed. Here, when the average extruding force (D) is 1.1 times or more of the average extruding force (E), the operating conditions that affect the entire coke oven deteriorate rapidly in a very short time. Such a case is assumed. In the blending rate stabilization period, for example, when the blending rate of the blended coal changes abruptly, a mixing period until the blended coal spreads throughout the coke oven, for example, extruding force during a period excluding about one day. The average may be the average extrusion force (E).

  (A) When there is a management item that exceeds the management standard value of the coal blend that is the coal charged into the carbonization chamber, the management item that exceeds this management standard value is determined to be within the management standard value. Make corrections.

  Here, as the management items, for example, the blending ratio of coal blended as coal charged into the carbonization chamber, the moisture content of coal, the particle size distribution of coal, the expansion and contraction of coal, the coal blending ratio of coal Etc. For each of these management items, a management standard is set so that the coke extrusion force can be made as small as possible in consideration of the quality of the finished coke, production cost, dry distillation efficiency, and the like.

  (B) When there is no management item exceeding the management reference value, adjustment is performed to reduce the blending rate of the specific brand of blended coal.

Here, when the compounding ratio of the specific brand increases, the extrudability deteriorates. Therefore, for example, it is preferable to adjust the blending ratio of the specific brand to 5 mass% or less. The specific brand refers to a brand that has a large load on the furnace wall and increases the extrusion load.
(2) When the average pressing force (D) is less than 1.1 times the average pressing force (E), adjustment is performed to reduce the content of volatile matter in the blended coal.

  If the blended coal contains a large amount of volatile matter, the amount of carbon deposited and deposited on the furnace wall will increase. Then, adjustment which reduces the content rate of the volatile matter of coal blend is performed. This adjustment can be performed, for example, by increasing the blending ratio of a specific brand of coal having a volatile content of 20% by mass or less.

  As described above, in the present invention, the cause of the increase in the extrusion force when extruding coke from the carbonization chamber can be identified, and by performing appropriate repairs or adjustments based on the cause, the operation of the coke oven as a whole can be performed. Can be stabilized.

It is a functional block diagram which shows an example of the operation management apparatus for performing operation management of the coke oven which carbonizes the coal which concerns on this invention, and makes it coke. It is a figure which shows an example of the processing flow in each means which concerns on this invention.

Claims (6)

An operation management device for managing the operation of a coke oven that carbonizes coal into coke,
For each carbonization chamber, a current rate of increase calculation means for calculating the current rate of increase (A), which is the rate of increase of the pushing force within the period after the nearest repair that is within the current repair cycle;
For each carbonization chamber, a past average increase rate calculating means for calculating a past average increase rate (B) that is an average of the increase rate of the pushing force within the past multiple repair cycles;
An increase rate calculating means for calculating an increase rate (C = A / B) of the current increase rate (A) with respect to the past average increase rate (B) for each carbonization chamber;
Increase rate calculated by the increase rate calculating means (C), when the coking chamber exceeding a predetermined value a _1, which is defined in the range of 1.4 to 3 appeared, the extrusion force in the carbonization chamber An increasing tendency judging means for judging whether the increase in the rate of increase is a tendency specific to the coking chamber or the whole coke oven;
As a result of the judgment by the increasing tendency judging means, when it is judged that the tendency is unique to the coking chamber, a repair instruction for the coking chamber is given, and when it is judged that the whole coke oven is trended, the coke oven is charged. And an instruction means for instructing adjustment of the blended coal. Determination in increasing determining means, increase rate (C) is more than two-thirds the rate of increase in the carbonization chamber of the coking chamber other than the carbonization chamber exceeds a predetermined value a ₁ is smaller than the predetermined value a ₁ Judging from 1.2 which is set as a value with a predetermined value a ₂ or more of the entire coke oven when tends to be defined by the range of 2.8, the increase rate (C) is said otherwise The operation management apparatus according to claim 1, wherein the tendency is determined as a tendency unique to the carbonization chamber exceeding a predetermined value a ₁ . The operation management apparatus according to claim 1 or 2, wherein an instruction for adjusting the blended coal in the instruction means when it is determined that the coke oven as a whole is in trend is performed as follows.
(1) The average pushing force (D) of the coking oven in the coke oven in the nearest period is 1. The average pushing force (E) of the coking oven in the coke oven in the blending rate stabilization period excluding the nearest period. In the case of 1 times or more, the following adjustment (a) or (b) is performed.
(A) When there is a management item exceeding the management standard value of the coal blend, a predetermined correction is made so that the management item exceeding the management standard value falls within the management standard value.
(B) When there is no management item exceeding the management reference value, adjustment is performed to reduce the blending rate of the specific brand of blended coal.
(2) When the average pressing force (D) is less than 1.1 times the average pressing force (E), adjustment is performed to reduce the content of volatile matter in the blended coal. An operation management method for managing the operation of a coke oven that carbonizes coal into coke,
For each carbonization chamber, a current rate of increase calculation step for calculating the current rate of increase (A), which is the rate of increase of the pushing force within the period after the nearest repair that is within the current repair cycle;
For each carbonization chamber, a past average increase rate calculating step for calculating a past average increase rate (B) that is an average of the increase rate of the pushing force within a plurality of past repair cycles;
An increase rate calculating step for calculating an increase rate (C = A / B) of the current increase rate (A) with respect to the past average increase rate (B) for each carbonization chamber;
The increase rate calculation increase rate calculated by step (C), when the coking chamber exceeding a predetermined value a _1, which is defined in the range of 1.4 to 3 appeared, the extrusion force in the carbonization chamber An increasing tendency judgment step for judging whether the increase in the rate of increase is a tendency specific to the coking chamber or the tendency of the whole coke oven;
As a result of the determination in the increasing tendency determination step, if it is determined that the tendency is specific to the coking chamber, a repair instruction for the coking chamber is issued, and if it is determined that the tendency of the entire coke oven is determined, the coke oven is charged. An operation step of instructing adjustment of the blended coal. Determination in increasing determination step, the increase rate (C) is more than two-thirds the rate of increase in the carbonization chamber of the coking chamber other than the carbonization chamber exceeds a predetermined value a ₁ is smaller than the predetermined value a ₁ Judging from 1.2 which is set as a value with a predetermined value a ₂ or more of the entire coke oven when tends to be defined by the range of 2.8, the increase rate (C) is said otherwise The operation management method according to claim 4, wherein the tendency is determined to be a tendency unique to the carbonization chamber exceeding a predetermined value a ₁ . The operation management method according to claim 4 or 5, wherein an instruction to adjust the blended coal in the instruction step when it is determined that the coke oven as a whole tends to be performed is performed as follows.
(1) The average pushing force (D) of the coking oven in the coke oven in the nearest period is 1. The average pushing force (E) of the coking oven in the coke oven in the blending rate stabilization period excluding the nearest period. In the case of 1 times or more, the following adjustment (a) or (b) is performed.
(A) When there is a management item exceeding the management standard value of the coal blend, a predetermined correction is made so that the management item exceeding the management standard value falls within the management standard value.
(B) When there is no management item exceeding the management reference value, adjustment is performed to reduce the blending rate of the specific brand of blended coal.
(2) When the average pressing force (D) is less than 1.1 times the average pressing force (E), adjustment is performed to reduce the content of volatile matter in the blended coal.

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