JP2002121558A - Process for operating coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a process for operating coke ovens which enables an increased coke production without damaging furnace wall bricks. SOLUTION: A database comprising operation data, blend coal data, coke data, repair data and damage data produced for each carbonization chamber is analyzed to construct an extrusion force-generation model wherein the extrusion force generated in each carbonization chamber under a certain condition is mathematized. The operation condition for each carbonization chamber is set based on this extrusion force-generation model. If the current extrusion force is smaller than that damaging the furnace wall bricks, the amount of coals charged in the oven will be increased under the extrusion force-generation model until the extrusion force which has been recalculated using the extrusion force-generation model approximates the extrusion force damaging the furnace wall bricks. By reflecting the amount of coals charged under the extrusion force-generation model in the amount of coals charged in the actual oven, the coke production may be increased without damaging the furnace wall bricks.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a method for operating a coke oven.

[0002]

2. Description of the Related Art In a coke oven in which coal is carbonized by carbonization, a combustion chamber and a carbonization chamber are alternately arranged, and are separated by refractory brick partitions (furnace wall bricks). Coal loaded in the hopper of the charging vehicle is charged into the carbonization chamber from above. Coal is carbonized by the heat of the combustion chambers arranged on both sides of the carbonization chamber to form coke. The carbonized coke is pushed from the side by the extrusion ram of the extruder and discharged from the carbonization chamber.

[0003] The purpose of producing coke is to supply coke of stable quality to the blast furnace so that the blast furnace can be operated efficiently. For this reason, a coke oven may require an increase in production due to the operation of the blast furnace. By charging a large amount of coal into the carbonization chamber after extruding coke, coke can be increased.

[0004]

However, when a large amount of coal is charged into the coking chamber, the weight of coke naturally increases. Further, coal is carbonized and shrunk and coked, but when a large amount of coal is charged into the carbonization chamber, the bulk density of the coal increases and the gap formed between the coke and the furnace wall becomes narrow. When a large amount of coal is charged into the coking chamber, the weight of the coke increases, and the gap between the coke and the furnace wall becomes narrow. May cause damage to the bricks of the furnace wall. Damage to the bricks of the furnace wall shortens the life of the coke oven.

Accordingly, an object of the present invention is to provide a method of operating a coke oven which can increase the production of coke without damaging the furnace wall brick.

[0006]

Hereinafter, the present invention will be described. In order to solve the above problems, the present invention analyzes at least one of operation data, blended coal data, coke data, repair data, and damage data created for each coking chamber, and generates the data under certain conditions. It is characterized in that an extruding force generation model in which the extruding force is formulated for each carbonization chamber is created, and operating conditions are set for each carbonization chamber based on the extrusion force generation model. Here, the pushing force generation model is created by statistically processing numerical values in a database for each carbonization chamber.

As a result of calculating the extrusion force from the extrusion force generation model or actually measuring the current extrusion force, the current extrusion force may be smaller than the extrusion force that damages the furnace wall brick. In this case, the charging amount of coal is increased on the extruding force generation model until the extruding force calculated again using the extruding force generation model becomes a value close to the extruding force that damages the furnace wall. By reflecting the increased amount of coal charged on the extruding force generation model to the amount of coal charged in the actual furnace, it is possible to increase the production of coke ovens without damaging the furnace wall bricks.

[0008]

FIG. 1 shows a coke oven to which a method for operating a coke oven according to an embodiment of the present invention is applied. As is well known, in a coke oven, a carbonization chamber 1 and a combustion chamber 2 are alternately arranged above a heat storage chamber to form a furnace group.
The carbonization chamber 1 has a length of 12 to 16 m, a height of 4 to 7 m, and a width of 40.
With a size of 0 mm to 450 mm and a coal charge of about 12 to 40 t, the CS side with the coke guide wheel is 4 times larger than the PS side with the extruder to facilitate the extrusion of coke.
The width is 0-75 mm wide. The coke oven has a carbonization chamber 1 for carbonizing coal, a combustion chamber 2 for burning fuel gas,
It consists of a heat storage room for utilizing the residual heat of the combustion waste gas and a horizontal flue below the heat storage room. The combustion chamber 2 is subdivided into a number of flue.

[0009] The coke oven is provided with auxiliary equipment such as a charging car, an extruder, a coke guide car, and a fire extinguishing car. The charging vehicle receives coal from the gate at the bottom of the charging coal tank, travels to a predetermined coking chamber 1 and charges the coal into the coking chamber 1. When the carbonization of the coal is completed in the coking chamber 1 and coking is completed, the extruder opens the furnace lid of the coking chamber 1 and extrudes the red hot coke and closes the furnace lid. The extruder has a furnace lid removing device that lifts and opens the furnace lid of the carbonization chamber 1, and an extrusion ram that extrudes red hot coke. The coke guide vehicle is located on the opposite side of the extruder across the carbonization chamber 1. When extruding red hot coke in the coking chamber, the coke guide vehicle opens the furnace lid of the coking chamber on the coke guide vehicle side and guides the extruded red hot coke onto the fire extinguishing vehicle. The fire extinguishing car receives red hot coke that is extruded through the guide grid of the coke guide car, and is driven by the train to run. The fire extinguishing vehicle that has received red hot coke travels to the fire tower where red hot coke is sprinkled and extinguished.

FIG. 2 shows an example of a configuration diagram for implementing the present invention using a computer. The coke oven calculator 6
The coke oven 7 is remotely monitored and controlled. Various data from the coke oven 7 are collected by the coke oven computer 6. Data for each carbonization chamber 1 necessary for predicting the hole 5 in the furnace wall brick is transmitted to the diagnostic analysis computer 8. A part of the data may be directly transmitted to the diagnostic analysis computer 8 without passing through the coke oven computer 6, or may be manually input by the computer terminal 8a.

Table 1 shows a database for each coking chamber 1 created by the method for operating a coke oven according to the present invention. The database is not the average value of the entire coking chamber of the coke oven, but is organized into data of the first coking chamber 1 and data of the second coking chamber 1 for each coking chamber 1. The database contains operation data, blended coal data, coke data, repair data,
Includes damage data.

[0012]

[Table 1]

The operation data further includes the data shown in Table 1 such as the carbonization time, generated gas, combustion chamber temperature, and coke extrusion force. The coke extrusion force is a current value of an extrusion motor when extruding with a pusher, a torque applied to a shaft of the extrusion motor, a value actually measured using a load cell, or the like.

The blended coal data further includes blended composition, moisture,
Each data shown in Table 1 such as volatile content is included. This blended coal data is mainly managed on a furnace group basis.

The coke data further includes intensity, reaction rate,
And data such as the granularity configuration. This coke data is also managed for each furnace group. By combining the operation data, the blended coal data and the coke data, it is possible to understand what kind of coke was produced when what kind of coal was put into what kind of carbonization room.

The repair data is chart-like data described for each carbonization chamber, and includes data on repair methods such as thermal spraying, semi-dry wet spraying, brick replacement, and the repair position of the repaired brick. Brick transshipment includes brick materials and the like.

The damage data is a content when a health check is performed on a furnace wall brick, and includes data on a damage state of the brick such as a position, a defect depth, a crack width, and a furnace body expansion amount. The damage data is obtained by, for example, analyzing an image captured by a video camera or the like using an image analysis device and quantifying the depth of the defect, the crack width, and the like.

In the method for operating a blast furnace according to the present invention, first,
The operation data, blended coal data, coke data, repair data, and damage data created for each coking room are analyzed, and an extruding force generation model that formulates the extruding force generated under certain conditions for each coking room is created. .

The extruding force generation model is obtained by statistically processing the numerical values in the above database, performing multiple regression analysis as multiple variables, and formulating the coke extruding force generated under certain conditions for each carbonization chamber 1. In other words, this extrusion force generation model is a calculation formula for determining under what conditions and how much coke extrusion force is required.

[0020]

(Equation 1)

Since the degree of damage is different for each carbonization chamber 1, even if the same coal is charged under the same conditions, the required pushing force is different if the carbonization chamber 1 is different. Therefore, for example, the coefficient of the dry distillation time is a1 for each carbonization chamber 1, and the blended coal has little effect on the first carbonization chamber, but the large coefficient a2 on the second carbonization chamber.
And the like are expressed as mathematical expressions. The extrusion force increases as the carbonization time is shorter, the charging amount is larger, and the damage to the brick is larger.

As the pushing force, the pushing force calculated from the pushing force generation model described above may be directly used, or the pushing force obtained from the pushing force generating model may be used instead of the furnace wall brick instead of the entire furnace wall brick. A local load or a local pressure applied locally to a part obtained by dividing a plurality of may be determined, and the local load or the local pressure may be used.

FIG. 3 shows the extrusion of coke in the extruder 22. When extruding coke, coke spreads and lateral pressure is applied to the furnace wall brick. At this time, the pushing force of the coke is not uniformly applied to the entire furnace wall, but is applied locally as a large local load or local pressure.

FIG. 4 is a graph showing the relationship between the pushing force and the local load. This graph is created using a compression test apparatus that can measure a local load or a local pressure acting on a side wall provided along the compression direction when the test coke is compressed in the extrusion direction. In this compression test apparatus, test coke generated under conditions corresponding to operating conditions in a real furnace is used. When the local load or pressure is used, the pushing force at which the furnace wall brick is damaged can be obtained more reliably. By using this local load or pressure, it is possible to more reliably determine the extrusion force at which the furnace wall brick is damaged. From this graph, it can be seen that, for example, when an extrusion force of αt is applied, a local load having a load index of 0.6 is applied to the furnace wall brick. If it is known that a brick with a loss of 50 mm is subjected to a local load having a load index of 0.6, the furnace wall brick is damaged. It turns out that it is damaged.

As a result of calculating the extruding force from the extruding force generation model or actually measuring the extruding force, the current extruding force may be smaller than the extruding force that damages the furnace wall brick. In this case, the charging amount of coal is increased on the extruding force generation model until the extruding force calculated again using the extruding force generation model becomes a value close to the extruding force that damages the furnace wall. By reflecting the increased amount of coal charged on the extruding force generation model to the amount of coal charged in the actual furnace, it is possible to increase the production of coke ovens without damaging the furnace wall bricks. For example, if the measured value of the pushing force is βt,
There is a margin of α-βt up to the pushing force αt that damages the furnace wall brick. If the amount of coal charged is increased by a margin of α-βt based on the extruding force generation model, the operating conditions can be changed to a limit value that does not damage the furnace wall brick, and the demand for increased production can be met.

[0026]

As described above, according to the present invention,
Extrusion force generated by analyzing at least one of operation data, blended coal data, coke data, repair data, and damage data created for each carbonization chamber and formulating the extrusion force generated under certain conditions for each carbonization chamber A generation model is created, and operating conditions are set for each carbonization chamber based on the pushing force generation model. As a result of calculating the extruding force from the extruding force generation model or actually measuring the extruding force, the current extruding force may be smaller than the extruding force that damages the furnace wall brick. In this case, the charging amount of coal on the extruding force generating model is increased until the extruding force calculated again using the extruding force generating model becomes a value close to the extruding force that damages the furnace wall. By reflecting the increased amount of coal charged on the extruding force generation model to the amount of coal charged in the actual furnace, it is possible to increase the production of coke ovens without damaging the furnace wall bricks.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a coke oven to which a method for operating a coke oven according to an embodiment of the present invention is applied.

FIG. 2 shows an example of a configuration diagram for implementing a method of operating a coke oven of the present invention using a computer.

FIG. 3 shows the extrusion of coke in an extruder.

FIG. 4 is a graph showing a relationship between an extruding force and a local load.

[Explanation of symbols]

 1 Carbonization room

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Mitsuru Ogawa 1-2-1 Marunouchi, Chiyoda-ku, Tokyo F-term in Nihon Kokan Co., Ltd. (reference) 4H012 EA00 LA03

Claims (1)

[Claims] 1. A method of operating a coke oven for coking and coking coal, comprising at least one of operation data, blended coal data, coke data, repair data and damage data created for each coking chamber. Is characterized by formulating an extrusion force generation model in which the extrusion force generated under certain conditions is formulated for each carbonization chamber, and setting operating conditions for each carbonization chamber based on this extrusion force generation model. How to operate a coke oven.