KR102325748B1 - Method of manufacturing coke - Google Patents

Abstract

A method for manufacturing coke according to an embodiment of the present invention includes the steps of preparing coal blended coal by mixing blast furnace sludge containing a zinc component with coal, and heating the coal blending coal to remove the zinc component and preparing coke And, the manufacturing of the coke further includes the step of re-oxidizing the vaporized zinc by adding _{CO 2 .}

Description

Coke manufacturing method {METHOD OF MANUFACTURING COKE}

It relates to a method for manufacturing coke using blast furnace sludge. More specifically, it relates to a method for producing coke by directly utilizing blast furnace sludge containing zinc without undergoing pretreatment.

The main components of the blast furnace sludge are iron (T.Fe), carbon (C), zinc oxide (ZnO), alkali (Alkali) and silicon dioxide (SiO ₂ ), and the content of iron (T.Fe) and carbon (C). Each is included at a level of about 30% by weight, so it can be used as an iron-containing / carbon-containing resource in the ironmaking process. However, the content of zinc oxide (ZnO) is high, about 25% by weight, which causes many restrictions on recycling in cattle. Therefore, there is a need for a technique for efficiently removing zinc oxide (ZnO) in the blast furnace sludge to recover valuable resources such as iron (T.Fe) and carbon (C) components. Zn separation (removal and recovery) technology can be mainly classified into dry and wet methods, and there are reduction methods using CO gas (dry method), wet methods using acidic or basic solutions, and physical beneficiation methods (dry, wet).

In the case of a process for recovering Zn using an acidic or basic solution, there is an advantage in that Zn with high purity can be recovered, but there is a problem in that wastewater generated during the Zn recovery process needs to be treated.

In addition, in the case of iron (T.Fe) and carbon (C) recovery and Zn removal method from blast furnace sludge through wet beneficiation, it has the advantage of being relatively easy to apply compared to other technologies. However, the Zn component in the blast furnace sludge is adsorbed to the surface of fine ore or coal particles after being vaporized in the blast furnace, so there is a limit to removing Zn from iron (T.Fe) and carbon (C) particles. there is Accordingly, although the recovery of iron (T.Fe) and carbon (C) shows a relatively high recovery rate, there is a problem that it is difficult to recycle in-house due to the high Zn content in the beneficiation product.

Accordingly, in order to recover Zn from by-products such as sludge, a method of reducing and recovering Zn using carbon (C) or CO gas is mainly used. However, after recovering Zn from by-products with very fine particles such as sludge, in order to recycle valuable resources such as iron (T.Fe) in cattle, a pretreatment process such as agglomeration process is additionally required.

As a way to solve the above problems, after manufacturing coal blended with blast furnace sludge, and then manufacturing coke using an existing coke oven, Zn component is removed and recovered, and valuable resources in the by-product, that is, iron (T We would like to suggest a method for directly recycling .Fe) and carbon (C) components without going through a separate pre-treatment process. In particular, in utilizing the existing coke oven process, it is possible to prevent the attachment of the Zn component to the equipment and improve the recovery rate of the Zn component.

A method for producing coke according to an embodiment of the present invention includes the steps of preparing coal blended coal by mixing blast furnace sludge containing a zinc component with coal, and heat-treating the coal blending coal to remove the zinc component and produce coke do.

The manufacturing of the coke may further include re-oxidizing the vaporized zinc by adding _{CO 2 .}

The step of re-oxidizing the vaporized zinc by introducing the CO ₂ may be performed at a temperature of 900° C. or less of the gasway.

Solidifying property in step the zinc vaporized by introducing the CO _2, CO ₂ input may be to start at the time of zinc oxide in the blast furnace sludge is returned to the zinc begins to vaporize.

The zinc vaporized by introducing the CO ₂ from the property solidifying step, CO ₂ input may be to start at the time of the coke reaches the center temperature of 500 to 700 ℃.

The zinc vaporized by introducing the CO ₂ from the property solidifying step, CO ₂ input may be to shut down the point in time at which the temperature of the gas-way reach 850 to 950 ℃.

Solidifying property in step the zinc vaporized by introducing the CO _2, CO ₂ gas may be one that is put in the position adjacent to the coke side of the carbonization chamber.

A method for producing coke according to another embodiment of the present invention includes the steps of preparing coal blended coal by mixing blast furnace sludge containing a zinc component with coal, and heat-treating the coal blended coal to remove the zinc component and prepare coke do.

The manufacturing of the coke may further include intensifying combustion at the upper part of the combustion chamber after the heat treatment.

The step of intensifying the combustion of the upper part of the combustion chamber after the heat treatment may include adjusting the temperature of the gasway above the carbonization chamber and/or the lower portion of the riser pipe to be higher than the vaporization temperature of zinc.

The step of intensifying the combustion of the upper part of the combustion chamber at the end of the heat treatment may be to increase the gasway temperature above the carbonization chamber more than the coke layer below the carbonization chamber by increasing the flame temperature or flame length of the combustion chamber toward the upper part. .

In the step of intensifying the combustion of the upper part of the combustion chamber after the heat treatment, the upper combustion intensification may be performed after a point in time when the amount of coke oven gas (COG) generation starts to decrease.

In the step of intensifying the combustion of the upper part of the combustion chamber at the end of the heat treatment, the upper combustion strengthening may be performed after the point in time when the amount _{of CH 4 gas generation starts to decrease.}

The step of intensifying the combustion of the upper part of the combustion chamber after the heat treatment may be performed at a temperature of the coke core of 900° C. or higher.

The present invention utilizes the coke oven process to remove and recover Zn from the blast furnace sludge and simultaneously produce coke, so that valuable resources (T.Fe, and C) in the blast furnace sludge can be reused.

In addition, it is possible to directly utilize the blast furnace sludge without a separate pretreatment, thereby reducing the cost and time required for treating the existing blast furnace sludge.

In addition, by manufacturing coke using iron (T.Fe) and alkali components in the blast furnace sludge, it is possible to produce high-reactive coke while recycling by-products. It is possible to reduce _{CO 2 in}

1 is a view showing a coke manufacturing process according to an embodiment of the present invention.
2 is a schematic diagram of a method for manufacturing coke according to an embodiment of the present invention.
3 is a view showing the average temperature for each position inside the coke oven carbonization chamber.
4 shows the coke core temperature and the Zn vaporization rate according to the carbonization time.
5 is a view showing a method of increasing the temperature of the gas way and the riser pipe point at the end of the heat treatment using the three-stage combustion method according to an embodiment of the present invention.
6 is a view showing the gas generation amount and the intermediate temperature of the carbonization chamber according to the drying time.

Hereinafter, embodiments of the present invention will be described in detail. However, this is provided as an example, and the present invention is not limited thereto, and the present invention is only defined by the scope of the claims to be described later.

In the present specification, when a part "includes" a certain component, this means that other components may be further included, rather than excluding other components, unless otherwise stated.

As used herein, the singular forms also include the plural forms unless the phrases clearly indicate the opposite. The meaning of "comprising," as used herein, specifies a particular characteristic, region, integer, step, operation, element and/or component, and includes the presence or absence of another characteristic, region, integer, step, operation, element and/or component. It does not exclude additions. The singular also includes the plural, unless the phrase specifically states otherwise. As used herein, when a part of a layer, film, region, plate, etc. is said to be “on” or “on” another part, it is not only when the other part is “directly on” but also when there is another part in between. include In addition, throughout the specification, "on" means to be located above or below the target portion, and does not necessarily mean to be located above the direction of gravity.

In the coke manufacturing method according to an embodiment of the present invention, the method includes the steps of preparing coal blended coal by mixing blast furnace sludge containing a zinc component with coal, and heating the coal blending coal to remove the zinc component and preparing coke do.

The manufacturing of the coke may further include re-oxidizing the vaporized zinc by adding _{CO 2 .}

1 is a view showing a coke manufacturing process according to an embodiment of the present invention.

2 is a schematic diagram of a method for manufacturing coke according to an embodiment of the present invention.

Referring to FIG. 1 , 10 or more types of coal and blast furnace sludge are stored in a plurality of storage bins ( 1 ). A certain amount of coal and blast furnace sludge are discharged from each bin according to the target mixing conditions, and these are transferred to the drying and mixing facility (2). In the drying and mixing facility (CMCP), moisture is dried by using high-temperature steam, and coal is homogeneously mixed through rotational motion. The homogeneously mixed coal blend is charged into the carbonization chamber through the charging hole at the top of the coke oven carbonization chamber 3 . After coke production in a coke oven, coke dry quenching (CDQ) and by-product treatment processes are performed.

The coal blended coal may include less than 3 wt% of blast furnace sludge based on 100 wt% of the total coal blended coal, and raw coal as the remainder. Specifically, the blast furnace sludge content may be greater than 0, and less than 3% by weight, or greater than 0, and less than or equal to 2.92 weight. When the ?t amount of the blast furnace sludge satisfies the above range, highly reactive coke can be manufactured while securing coke strength. On the other hand, when the content of the blast furnace sludge is not satisfied, the strength or quality of the coke may be reduced due to the content of the alkali component and/or the content of the zinc component. The blast furnace sludge has a zinc component content of 7 to 21% by weight, an iron (T.Fe) content of 11 to 24% by weight, a carbon (C) content of 20 to 34% by weight, and an alkali component based on 100% by weight of the total blast furnace sludge. The content may be 4 to 7% by weight, and the balance may include other impurities. However, this is only an example of the present invention, and the present invention is not limited thereto.

The charged coal is manufactured into coke from which Zn components in the blast furnace sludge have been removed through a drying process at about 1050°C for 18 to 20 hours, and the manufactured coke is cooled to a temperature of 200°C or less through a dry fire extinguishing facility (40). and is discharged Coke oven gas (hereinafter referred to as COG) is generated during the carbonization process of the charged coal blend, and Zn vaporized together with the COG gathers in the gasway at the top of the carbonization chamber and is discharged through the upper pipe.

The COG may include O ₂ , CO, CO ₂ , H ₂ , and/or CH _{4 ,} etc.).

Blast furnace sludge contains iron (T.Fe), carbon (C), zinc oxide (ZnO), and alkali (Alkali) components, and iron (T.Fe) and alkali (Alkali) components produce highly reactive coke. and the carbon component can be used as a raw material for coke production and/or as a reducing agent for reducing zinc oxide (ZnO).

3 is a view showing the average temperature for each position inside the coke oven carbonization chamber. The temperature of the coal blended coal charged into the carbonization chamber rises to an average of about 1050° C., and becomes coke. Zinc oxide (ZnO) in the blast furnace sludge is reduced to Zn according to Reaction Formula (1), and vaporization occurs.

Scheme (1): ZnO(s) + C(s) → Zn(g) + CO(g)

At the upper part of the carbonization chamber, vaporized Zn gas together with the coke oven gas is collected in the gasway.

Zn in the blast furnace sludge mainly exists in the state of zinc oxide (ZnO), and the vaporization temperature of zinc oxide (ZnO) is 1975°C, which is vaporized under very high temperature conditions. However, when zinc oxide (ZnO) is reduced to Zn, the vaporization temperature is lowered to 907°C, and vaporization is possible at a very low temperature compared to zinc oxide (ZnO).

Vaporized Zn passes through the coal or coke layer and moves to the upper part of the oven, and passes through the gasway and riser pipe together with the gas (COG, Coke Oven Gas) generated during the coal distillation process to the COG treatment process.

As shown in FIG. 3, the temperature of the gasway in the carbonization chamber gradually increases from the initial stage to the end of the dry distillation, but the temperature of the gas in the gasway and the riser pipe is lowered to 907°C or lower due to heat loss generated in the gas movement process. will be lowered Accordingly, the vaporized Zn may be adhered to the gasway and/or the riser pipe, and problems such as adhesion in the coke oven, clogging of the pipe, and a decrease in the Zn recovery rate may occur.

In order to solve the above problem, if the temperature of the carbonization chamber is excessively increased, there is a possibility that secondary problems such as deterioration of coke quality, damage to oven refractories and/or reduction of COG heat due to cracking may occur.

The present invention comprises the steps of manufacturing coal blended coal by mixing blast furnace sludge containing a zinc component and coal, and heating the coal coal blend to remove the zinc component and produce coke, and a gasway or riser pipe in a coke oven. It is possible to provide a coke manufacturing method capable of preventing Zn adhesion and clogging of pipes due to Zn, and improving Zn recovery rate. Specifically, in the step of producing the coke, CO ₂ is added to re-oxidize the vaporized zinc, or by intensifying the combustion at the upper point of the combustion chamber at the end of the heat treatment, Zn is attached to the gasway or riser in the coke oven, and Zn It is possible to prevent clogging of pipes by In addition to this, it is possible to prevent deterioration of coke quality due to excessive temperature rise of the carbonization chamber temperature, damage to oven refractories, and reduction in COG heat quantity due to cracking.

Coke manufacturing method 1

A method for manufacturing coke according to an embodiment of the present invention includes the steps of preparing coal blended coal by mixing blast furnace sludge containing a zinc component with coal, and heating the coal blending coal to remove the zinc component and preparing coke And, the manufacturing of the coke further includes the step of re-oxidizing the vaporized zinc by adding _{CO 2 .}

In this case, the vaporized Zn gas exists in a liquid phase or a gas phase depending on the temperature of the gasway, _{and reacts with the input CO 2} to cause a reoxidation reaction as shown in the following Reaction Formula (2) or Reaction Formula (3).

Reaction formula (2): [Gasway temperature 850℃ or less] Zn(s, l, g) + CO ₂ (g) → ZnO(s) + CO(g)

Reaction equation (3): [Gasway temperature 850 to 900℃] Zn(g) + CO ₂ → ZnO(s) + CO(g)

Since zinc oxide (ZnO) produced by the reoxidation reaction has a high vaporization temperature of 1975°C, it exists as a solid phase in the gas, thereby suppressing Zn adhesion in the carbonization chamber or riser pipe and increasing the Zn recovery rate.

3 shows the average temperature for each location in the carbonization chamber of the coke oven.

Referring to FIG. 3 , the temperature of the coal and coke charging layer in the carbonization chamber rises to 1050° C. or more, and the average temperature of the gasway at the top of the carbonization chamber tends to increase from the initial stage to the end of the carbonization. The gasway temperature may vary depending on operating conditions and carbonization time, but generally increases to 900° C. or higher.

The step of re-oxidizing the vaporized zinc by introducing the CO ₂ may be performed at a temperature of 900° C. or less of the gasway. Specifically, it may be carried out at 600 to 900 °C. In this case, it is possible to efficiently recover Zn while preventing a decrease in the coke yield and suppressing Zn adhesion.

In the CO ₂ phase property solidifying the zinc vaporization by putting,, the process efficiency depends on the CO ₂ In the start and end time.

Specifically, the _{start time and end time of the CO 2} input may be set in consideration of the temperature pattern of the gas way.

Solidifying property in step the zinc vaporized by introducing the CO _2, CO ₂ input may be to start at the time of zinc oxide in the blast furnace sludge is returned to the zinc begins to vaporize. Specifically, the CO ₂ input may be started when the temperature of the gasway reaches 500 to 700°C. More specifically, it may be started when the temperature of the gasway reaches 600°C.

Since CO ₂ input is for re- _{oxidation to zinc oxide by reacting CO 2} with vaporized zinc, in case of input before zinc gas is generated, the input CO ₂ gas is mixed with COG without reacting with zinc gas and discharged through the riser, so that it is discharged A problem of unnecessarily increasing the amount of gas and the amount of post-processing gas may occur.

The zinc vaporized by introducing the CO ₂ from the property solidifying step, CO ₂ is introduced point may be to start at the time of a gas-way temperature reached 600 ℃. When the above temperature is satisfied, zinc oxide in the blast furnace sludge may be reduced to zinc and vaporized. If the temperature is too low, CO ₂ is introduced before the zinc gas is generated, which may cause a problem of unnecessarily increasing the amount of exhaust gas and post-processing gas.

The zinc vaporized by introducing the CO ₂ from the property solidifying step, CO ₂ input may be to shut down the point in time at which the temperature of the gas-way reach 850 to 950 ℃. Specifically, the CO ₂ input may be terminated when the temperature of the gasway reaches 900°C.

When the temperature of the gasway is too high, CO ₂ reacts with the coke as shown in Reaction Equation (4) below, and the coke yield may decrease.

Scheme (4): [over 900℃] C+CO ₂ →2CO

4 is a graph showing the Zn vaporization rate according to the coke core temperature and carbonization time when the coal blending is carried out.

_{According to FIG. 4, CO 2} starts to be input from the point when the coke core temperature reaches 600° C. (reaction time 120 minutes elapsed), which is the point at which Zn is vaporized, and when the gasway temperature reaches 900° C., CO ₂ It can be seen that when the input is finished, Zn can be efficiently recovered while preventing a decrease in the coke yield and suppressing Zn adhesion.

3, in the coke oven carbonization chamber according to an embodiment of the present invention, a riser pipe through which gas is discharged may be disposed above the carbonization chamber adjacent to the pusher side. In this case, the CO ₂ gas inlet is disposed above the carbonization chamber adjacent to the coke side, and the CO ₂ gas may be supplied.

Solidifying property in step the zinc vaporized by introducing the CO _2, CO ₂ gas may be one that is put in the position adjacent to the coke side. In this case, by increasing the residence time of the _{CO 2 gas in the carbonization chamber, the reaction between CO 2} and Zn can be increased.

More specifically, when the entire section of the carbonization chamber is divided into quarters from the cock side to the pusher side and divided into zones 1, 2, 3, and 4 from the zone close to the pusher side, the riser is located at the top in zone 1, The CO ₂ inlet may be located in the upper part of zone 4.

How to make coke 2

A method for producing coke according to another embodiment of the present invention includes the steps of preparing coal blended coal by mixing blast furnace sludge containing a zinc component with coal, and heating the coal blending coal to remove the zinc component and preparing coke includes

The manufacturing of the coke further includes intensifying combustion at the upper part of the combustion chamber after the heat treatment.

Since Zn adhesion in the coke oven occurs at the gasway and riser points, Zn adhesion and/or pipe clogging can be reduced if a local hot zone is formed at the gasway and riser points. The combustion method of the combustion chamber may take a single-stage combustion method, or a two-stage or three-stage combustion method. In general, the combustion method of the same pattern is taken from the initial stage to the end of the dry distillation.

In the present invention, it is possible to provide a method for preventing Zn from adhering to the gasway and the riser point by applying a dual combustion method in consideration of the generation pattern of the COG gas generated during the dry distillation process. The dualization of the combustion method means that the combustion method is performed differently at the end of the dry distillation than during the initial period and the middle period of the dry distillation.

The step of intensifying the combustion of the upper point of the combustion chamber at the end of the heat treatment may be to adjust the temperature of the carbonization chamber gasway and the lower portion of the riser to 907 degrees or more. In this case, since the temperature of the lower part of the gasway and the riser is maintained above the vaporization temperature of Zn, Zn adhesion to the gasway and the riser in the carbonization chamber is prevented, and the Zn recovery rate can be improved.

Specifically, the step of intensifying the combustion of the upper part of the combustion chamber at the end of the heat treatment is to increase the flame temperature and length of the combustion chamber toward the upper part, thereby lowering the gasway temperature above the carbonization chamber or the temperature of the lower part of the riser than the coke layer in the lower part of the carbonization chamber. It could be higher.

5 is a view showing a method of increasing the temperature of the gasway and the lower portion of the riser pipe using the three-stage combustion method according to an embodiment of the present invention. However, this is only an example to aid understanding, and does not mean that the present invention is limited thereto. The same method can also be applied to the second stage combustion method.

As shown in FIG. 5 , by applying a combustion pattern in which combustion in the lower part of the combustion chamber is strengthened in the same manner as before from the initial stage to the middle stage of the dry distillation, coke quality can be secured through sufficient calorie supply. At the end of the dry distillation, by intensifying the combustion at the upper point of the combustion chamber, and by locally increasing the temperature at the gasway and riser point of the carbonization chamber, the adhesion of Zn can be prevented.

Specifically, by reducing the amount of air supplied from the lower part of the combustion chamber and increasing the amount of air supplied from the upper part, when the same amount of gas is supplied, it burns more in the upper part than in the lower part. By this method, it is possible to locally increase the temperature of the upper part of the combustion chamber.

In the step of intensifying the combustion of the upper part of the combustion chamber at the end of the heat treatment, the upper combustion intensification time may be performed from a point in time when the amount of COG generation starts to decrease.

More specifically, in the step of intensifying the combustion of the upper point of the combustion chamber at the end of the heat treatment, the upper combustion strengthening may be performed from a time point when the amount _{of CH 4 gas generation starts to decrease.}

Since COG contains a large amount of CH _4, when the temperature of the gasway and riser rises by strengthening the combustion at the upper point of the combustion chamber in a state where there is a large amount of COG, the COG caused by cracking of the _{CH 4 gas} Calorie reduction may occur.

The step of intensifying the combustion of the upper part of the combustion chamber after the heat treatment may be performed at a temperature of the coke core of 900° C. or higher. When the coke core temperature satisfies the above range, _{since the amount of COG and CH 4} gas is reduced, it is possible to prevent the reduction in the amount of COG heat due to the occurrence of cracking of the _{CH 4 gas.}

6 is a view showing the gas generation amount and the intermediate temperature of the carbonization chamber according to the drying time. The carbonization chamber intermediate temperature means the temperature of the middle part in the width direction of the carbonization chamber. Specifically, it means the coke temperature (coke core temperature) of the middle part when coke is produced. For example, for a carbonization chamber having a width of 450 mm, it means the coke temperature at a point 225 mm from the carbonization chamber wall. Since heat is transferred from the chamber walls during coke production, the center of the chamber top is usually the last to reach the heat.

Referring to FIG. 6 , it can be seen that the amount of COG generation decreases at a point where the carbonization chamber intermediate temperature (coke core temperature) is 900° C. after the drying time is about 12 hours. In addition, the decrease in the amount of COG generation appears at a time similar to the time when the amount _{of CH 4 generation decreases.}

Since it is easier to measure the amount of COG generation and change compared to measuring the amount of CH ₄ generation and change, when judging the timing of intensifying combustion at the upper point of the combustion chamber at the end of the heat treatment, when the COG generation decreases as a reference point, the timing of enhancing combustion after heat treatment is determined This may have the advantage of being easy.

The present invention is not limited to the above embodiments, but can be manufactured in a variety of different forms, and those of ordinary skill in the art to which the present invention pertains can take other specific forms without changing the technical spirit or essential features of the present invention. It will be understood that it can be implemented as Therefore, it should be understood that the embodiments described above are illustrative in all respects and not restrictive.

1 storage bin
2 Drying and mixing equipment
3 coke oven
4 fire extinguishing equipment

Claims (12)

preparing coal blends by mixing coal with blast furnace sludge containing a zinc component; and
Including; removing the zinc component and preparing coke by heat-treating the coal blend;
The manufacturing of the coke further includes the step of re-oxidizing the vaporized zinc by adding _{CO 2 and}
The step of re-oxidizing the vaporized zinc by inputting the CO2,
It is carried out at a temperature of 900 ° C. or less of the gas way,
using a coke oven process,
A method of making coke.
delete According to claim 1,
In the step of re-oxidizing the vaporized zinc by inputting the CO _2,
CO ₂ input is to start at the time when zinc oxide in the blast furnace sludge is reduced to zinc and begins to vaporize,
A method of making coke.
4. The method of claim 3,
In the step of re-oxidizing the vaporized zinc by inputting the CO _2,
CO ₂ dosing is started when the coke core temperature reaches 500-700 °C,
A method of making coke.
According to claim 1,
In the step of re-oxidizing the vaporized zinc by inputting the CO _2,
CO ₂ input is to end when the temperature of the gasway reaches 850 to 950 ℃,
A method of making coke.
According to claim 1,
In the step of re-oxidizing the vaporized zinc by inputting the CO _2,
CO ₂ gas will be introduced at a location adjacent to the coke side of the carbonization chamber,
A method of making coke.
preparing coal blends by mixing coal with blast furnace sludge containing a zinc component; and
Including; removing the zinc component and preparing coke by heat-treating the coal blend;
The step of producing the coke further includes the step of intensifying the combustion of the upper point of the combustion chamber after the heat treatment,
Intensifying the combustion of the upper part of the combustion chamber at the end of the heat treatment,
It is to adjust the temperature of the gasway at the upper part of the carbonization chamber or the lower part of the riser pipe to be higher than the vaporization temperature of zinc,
using a coke oven process,
A method of making coke.
delete 8. The method of claim 7,
Intensifying the combustion of the upper part of the combustion chamber after the heat treatment is performed,
By increasing the flame temperature or flame length of the combustion chamber upward, the gasway temperature above the carbonization chamber is increased more than the coke layer below the carbonization chamber,
A method of making coke.
8. The method of claim 7,
In the step of intensifying the combustion of the upper point of the combustion chamber at the end of the heat treatment,
Top combustion intensification is performed after the point in time when the amount of coke oven gas (COG) generation starts to decrease,
A method of making coke.
8. The method of claim 7,
In the step of intensifying the combustion of the upper point of the combustion chamber at the end of the heat treatment,
Top combustion intensification is performed after the time when the amount _{of CH 4 gas generation begins to decrease,}
A method of making coke.
8. The method of claim 7,
Intensifying the combustion of the upper part of the combustion chamber at the end of the heat treatment is
That the coke core temperature is carried out at 900 ° C or higher,
A method of making coke.

Images