JP2021031581A - Method for repairing coke oven - Google Patents

Abstract

To provide a method for repairing a coke oven, capable of performing replacing and repairing efficiently when the number of combustion chambers to be repaired is large.SOLUTION: Provided is a method for repairing a coke oven for renewing at least 8 or more oven ports of combustion chambers by replacing and repairing, in the coke oven formed by arraying a plurality of combustion chambers 11 in line in a width direction of the coke oven. The method includes a replacing-and-repairing step of performing replacing and repairing to a replacing-and-repairing part 21 by putting the coke oven in a heat retention pause state, provided that in the coke oven, among the combustion chambers to be replaced and repaired, one or more lines of combustion chambers arrayed continuously are regarded as a replacing-and-repairing combustion chamber group 20, a portion to be replaced and repaired in the replacing-and-repairing combustion chamber group 20 is regarded as the replacing-and-repairing part 21, and a portion other than the replacing-and-repairing part 21 in the replacing-and-repairing combustion chamber group 20 is regarded as a non-replacing-and-repairing part 22. In the replacing-and-repairing step, the temperature of the whole of the non-replacing-and-repairing part 22 is controlled to be in a temperature range where bricks are not degraded, by controlling the temperature of adjacent combustion chambers 30 adjacent to the replacing-and-repairing combustion chamber group 20.SELECTED DRAWING: Figure 1

Description

The present invention relates to a method for repairing a coke oven in which the coke oven is transshipped and repaired in a heat-retaining state of rest when the coke oven is transshipped and repaired.

A chamber-type coke oven (hereinafter, also simply referred to as "coke oven") is a structure using bricks, and has a heat storage chamber at the bottom of the furnace body, and combustion chambers and carbonization chambers alternate at the top. It is an arranged structure. Combustion chamber bricks are damaged by the coke oven after many years of operation.

Minor damage to the surface of bricks can be repaired by spraying or spraying, but if the damage becomes significant, it will be necessary to repair the bricks by reloading them. There are multiple methods for repairing bricks, but this specification covers the kiln mouth repair method unless otherwise specified.

The kiln mouth repair method is a method of transshipping the bricks of the kiln mouth, which is the most damaged among the bricks in the combustion chamber. In the repair, the bricks to be repaired are dismantled from the carbonization chambers on both sides of the combustion chamber having the bricks to be repaired, and the bricks to be repaired are replaced with new bricks.

In the carbonization chamber adjacent to the combustion chamber where the kiln mouth is repaired, coke cannot be produced during the repair period. On the other hand, even during the repair of the kiln mouth, it is required to secure as much as possible the amount of coke produced and the amount of by-products such as by-products produced in the entire coke oven. Therefore, the repair will be carried out while continuing coke production and by-product production (hereinafter collectively referred to as "coke operation") within a range that does not affect the repair. That is, the situation where coke production was continued in the carbonization chamber other than the carbonization chamber using the repaired combustion chamber as a heat supply source, and combustion was continued in the flue other than the flue of the kiln mouth to be repaired even in the repaired combustion chamber. It will be carried out at.

Repairs carried out while continuing combustion in the combustion chamber in this way are also referred to as hot repairs in order to distinguish them from repair forms in which brickwork is carried out at room temperature. The above-mentioned kiln mouth repair method is also hot repair. Therefore, unless otherwise specified, the hot kiln mouth repair method is simply referred to as hot repair.

During hot repair, it is important to keep the bricks that are not the target of repair in a high temperature state so that damage such as cracks does not occur due to temperature drop, while at the repair site, in order to secure a working environment. A heat-insulated structure or the like is used, but it is preferable that the heat transfer from the non-repaired part is small.

At the time of hot repair, first, while burning the combustion chamber other than the transshipment repair part, the space between the transshipment repair part and the non-transshipment repair part is provided with a heat insulating partition wall equipped with a fireproof lining for heat insulation. Partition the carbonization chamber. Next, a heat insulating curtain or a heat insulating box is inserted from the outside on the repaired part side to maintain the working environment of the repaired part at an appropriate temperature. Then, the damaged brick wall is dismantled and a new brick wall is constructed. During that time, the bricks of the non-transshipment repair section are kept at a high temperature that does not damage them.

As described above, in the conventional hot repair method, coke is produced in a carbonization chamber that does not affect the repair work, such as a carbonization chamber that is not a heating target from the combustion chamber that is the repair target. As a whole, coke manufacturing work and repair work will be carried out in parallel. Normally, the process of coke manufacturing work such as operation of ancillary equipment for coke manufacturing is prioritized. For example, if a mobile machine is operated to produce coke in front of the combustion chamber where the repair work is being carried out, the repair work cannot be carried out during that time, so the repair work is waiting. It is inevitable that you need.

On the other hand, in the conventional hot repair method, the coke oven repair and the coke operation are performed in parallel, so that the coke operation can be secured even during the repair period, and there is an advantage that the coke production can be continued. is there. However, in this case, the problem is that in the combustion chamber where the transshipment repair of the kiln mouth is performed, the transshipment repair part stops the gas supply, so that the part becomes cold, so the part especially close to the transshipment repair part. It was difficult to control the temperature of the non-transshipment repair part in a stable manner.

In response to this problem, in Patent Document 1, fuel gas is introduced from both sides in the direction of the furnace length into the fuel supply pipes arranged in the direction of the furnace length at the bottom of the combustion chamber, and the fuel gas is supplied to each flue in the combustion chamber. It discloses a method of heating a combustion chamber when transshipment repair is performed in a coke oven.

In the method of Patent Document 1, a shield is installed at the boundary between the transshipment repair section and the non-transshipment repair section so that the fuel gas is not supplied to the transshipment repair section. Fuel gas is not supplied to the fuel supply pipe on the transshipment repair section side, and fuel gas is supplied to the flue of the non-transshipment repair section from the side opposite to the transshipment repair section side. In this state, the amount of fuel gas supplied to the flue of the non-transshipment repair section that is in contact with the transshipment repair section is reduced, so the fuel gas burner independent of the fuel supply pipe is supplied to the flue of the non-transshipment repair section. Is installed to supply fuel gas. In this way, the method of Patent Document 1 reduces the temperature change of the entire flue of the non-transshipment repair portion.

Special Publication No. 61-052194 JP-A-55-0788086 Japanese Unexamined Patent Publication No. 57-147584

By the way, when there are many combustion chambers to be repaired, the combustion chambers to be repaired and the combustion chambers to be non-repaired are complicated in terms of position and work plan. In addition, since the number of repaired parts requiring a waiting time increases with respect to the operation of the mobile machine for coke production, the time required for the repair work increases.

That is, in the conventional method, the inefficiency associated with performing different operations in parallel, such as coke production and repair work, becomes remarkable. Deterioration of the efficiency of the repair work not only worsens the cost due to the lengthening of the repair work, but also the coke production cannot be performed in the part where the repair work is not completed. It has the adverse effect of reducing coke production. Such a problem cannot be solved by the technique of Patent Document 1.

Therefore, an object of the present invention is to provide a method for repairing a coke oven that can efficiently perform transshipment repair when the number of combustion chambers to be repaired is large.

As a result of diligent studies in order to solve the above problems, the present inventors have come up with the idea of putting the coke oven in a heat-retaining state and performing transshipment repair.

Here, "heat retention suspension" is also referred to as "hot banking" or simply "banking", and the temperature of the coke oven body is maintained at a high temperature (heat retention) so that the coke operation can be suspended and restarted at any time. It is to be.

Techniques related to heat retention suspension of a coke oven are described in, for example, Patent Documents 2 and 3. Patent Document 2 discloses a technique relating to a heat insulation suspension method for a coke oven, which puts the coke oven in a heat insulation suspension state in order to reduce the production of coke and keep the operation rate below which the coke oven can operate stably. Specifically, we disclose a technology that keeps the inside of the furnace warm in the state of being filled with coke during the transition period (the period of installing the heat insulating material), discharges the coke after installing the heat insulating material, and keeps the inside of the furnace warm in the empty furnace with combustion gas. ing. Patent Document 3 discloses a technique for renewing the dry main in a state where coal in all carbonization chambers is burned down and coke production is stopped. This method is an example in which the coke operation is not performed to repair or renew the equipment attached to the coke oven. The carbonization chamber and the dry main are separated, and the carbonization chamber side is kept warm for several days with the coke filled. is there.

However, as far as the inventors have investigated, there is no technique for transshipping and repairing a coke oven in a heat insulating state.
The reason is that, generally, when the coke oven is put into a heat-retaining hibernation state, the entire coke oven is sealed and protected in order to suppress the temperature drop due to the intrusion of air into the carbonization chamber. In Patent Document 3, since the dry main is renewed in a heat-retaining hibernation state, the construction can be carried out with the carbonization chamber sealed for the renewal of ancillary equipment, but the sealed state is maintained when the combustion chamber is transshipped and repaired. It was difficult to maintain the temperature.
Due to such circumstances, it was not considered to carry out transshipment repair of the coke oven in the heat insulation suspension state.

However, when the number of combustion chambers to be repaired is large, the present inventors put the coke oven in a heat-retaining state and perform transshipment repair to shorten the repair period, so that the repair period is longer than the above disadvantage. I thought that the profit from shortening the cost would be superior.

Specifically, I thought as follows. First, the repair period of the conventional repair method (repair method 1) in which coke operation and transshipment repair are carried out in parallel is defined as (1). Further, the repair period of the repair method (repair method 2) in which the coke oven is put into a heat retaining state and the transshipment repair is performed is defined as (2A). In the repair method 2, normal coke operation becomes possible after the repair period (2A). Therefore, after the repair period (2A), the period in which the coke operation is performed until the coke production amount becomes the same as the coke production amount in the repair period (1) of the repair method 1 is defined as (2B).
In such a case, if the number of kiln openings in the combustion chamber to be repaired is small, (1) ≒ (2A) + (2B) or (1) <(2A) + (2B), and the heat retention is suspended. The adverse effects of transshipment repair may occur. On the other hand, if the number of combustion chambers to be repaired is large, (1) >> (2A) will occur, and as a result, (1)> (2A) + (2B) will be obtained. The benefits of doing this will increase.
In this way, when the number of combustion chambers to be repaired is large, it was considered better to put the coke oven in a heat-retaining state and perform transshipment repair.

In this way, the repair method that puts the coke oven in a heat-retaining hibernation state in order to concentrate on the repair work of the furnace for a certain period of time is a method that has the potential to shorten the repair period in a coke oven with an increased number of repair sites. The inventors have found that there are further problems in implementing it.

In order to repair the coke oven while the heat insulation is suspended, the temperature control of the non-transshipment repair section and the brick repair work of the transshipment repair section must be carried out at the same time. It is clear that the transshipment repair section prefers a low temperature from the viewpoint of ensuring a working environment, and the non-transshipment repair section prefers a high temperature from the viewpoint of avoiding brick damage. However, the transshipment repair unit and the non-transshipment repair unit are close to each other in the vicinity of the boundary, and it is not easy to perform independent temperature control with sufficient accuracy on both sides of the boundary. In particular, there arises a problem that the brick temperature of the non-transshipment repair section near the transshipment repair section becomes low. When the temperature of the brick becomes low, cracks and cracks occur.

In the conventional hot repair method, the coke operation and the hot repair work are performed in parallel. Therefore, in the coke operation, in each carbonization chamber, the periodic temperature along the process from coal charging to carbonization and discharge is performed. Although there were changes, the temperature of the entire furnace group was stable at a high temperature, and the temperature of the non-transshipment repair part was also maintained at a high temperature. Regarding this, the present inventors have found that the non-transshipment repaired portion is heated by heat transfer (heat compensation) from a combustion chamber that is not the target of repair, and the temperature of the brick is maintained at a high temperature.

Based on the above findings, as a result of further diligent studies, the present inventors have controlled the temperature of the combustion chamber adjacent to the combustion chamber to be repaired so that the temperature of the non-transshipment repaired portion is set to a temperature at which the brick does not deteriorate. They found that they could be controlled and completed the present invention.

Based on the above, one aspect of the present invention for solving the above problems is to transship at least eight or more combustion chamber kilns in a coke oven in which a plurality of combustion chambers are arranged in a row in the furnace width direction. It is a method of repairing a coke oven that is renewed by repair. In a coke oven, one or two or more rows of continuous combustion chambers among the combustion chambers for transshipment repair are designated as the transshipment repair combustion chamber group, and the transshipment repair combustion chamber is used. When the part where the group is transshipped and repaired is the transshipment repair part and the part other than the transshipment repair part of the combustion chamber group is the non-transshipment repair part, the coke oven is put into a heat insulation state and the transshipment repair is performed. It is equipped with a transshipment repair process for transshipping and repairing parts, and in the transshipment repair process, the temperature of the entire non-transshipment repair part is not bricked by controlling the temperature of the adjacent combustion chamber adjacent to the transshipment repair combustion chamber group. This is a coke oven repair method characterized by controlling within the deterioration temperature range.

Further, in the coke oven, when the combustion chambers other than the transshipment repair combustion chamber group and the adjacent combustion chamber are designated as the non-transshipment repair combustion chamber group, the temperature of the adjacent combustion chamber is set to the non-transshipment repair combustion chamber in the transshipment repair process. The temperature may be controlled to be higher than the average temperature of the group, or the temperature of the adjacent combustion chamber may be controlled to be 100 to 200 degrees higher than the average temperature of the non-transshipment repair combustion chamber group. The temperature of the entire non-transshipment repair unit may be controlled in the range of 950 ° C. or higher and 1250 ° C. or lower.

Further, when the transshipment repair combustion chamber group is sandwiched between two adjacent combustion chambers separated by each other, the transshipment repair combustion chamber group is often composed of seven or less continuous combustion chambers, and both sides of the adjacent fuel chamber. When the transshipment repair combustion chamber group is arranged in, the position in the furnace length direction is different between the transshipment repair part of one transshipment repair combustion chamber group and the transshipment repair part of the other transshipment repair combustion chamber group. It is good to be there.

According to the present invention, when the number of kiln openings in the combustion chamber to be repaired is large, transshipment repair can be performed efficiently. In addition, this makes it possible to suppress a decrease in coke production due to transshipment repair.

It is a top view of the coke oven 10. It is a figure which showed the state of the heat transfer from the combustion chamber adjacent to the transshipment repair combustion chamber in the conventional repair method. It is a figure which showed the state of the heat transfer from the adjacent combustion chamber 30 adjacent to the transshipment repair combustion chamber group 20 in the repair method of this invention. It is a figure which showed an example of the structure of the transshipment repair combustion chamber group. It is a figure which showed the temperature of the non-transshipment repair part when the conventional repair method and the conventional repair method were simply performed in a heat-retaining pause state. It is a figure which showed the temperature of the non-transshipment repair part when the repair method of this invention was used.

Hereinafter, the method for repairing the coke oven of the present invention will be described. The feature of the present invention is to carry out transshipment repair of the kiln opening of the combustion chamber by putting the coke oven in a heat retaining state.

Here, regarding the direction of the chamber-type coke oven, the vertical direction is the "height direction", the direction in which the carbonization chamber and the combustion chamber are alternately layered is the "furnace width direction", and the direction in which the coke that has been dried and distilled is extruded. Is generally referred to as "furnace length direction", and this designation is also adopted in this specification.
Regarding the carbonization chamber and the combustion chamber, the part facing the outside of the furnace in the direction of the furnace length is called the "kiln mouth". Since the kiln mouths are located at both ends in the furnace length direction, the side where the coke extruder exists is called PS (Pusher Side) and the side where coke is discharged is called CS (Coke Side) when distinguishing between them. These designations are also common, and these designations are also adopted herein.
In addition, heat retention is suspended in the coke oven that includes a plurality of combustion chambers to be repaired (hereinafter, also simply referred to as “repair area”). The repair area is preferably selected by a unit called a furnace group, which is determined by the configuration of the furnace arrangement and the work unit, but is not limited to this.
In the present specification, the unit "degree" for expressing temperature means "° C".

FIG. 1 shows a coke oven 10 which is a part of the furnace group in the repair area. FIG. 1 is a plan view of the coke oven 10 observed from above. As shown in FIG. 1, in the coke oven 10, a plurality of combustion chambers 11 are arranged in a row in the furnace width direction. The combustion chamber 11 is composed of a plurality of flues and extends in the direction of the furnace length as a whole. Further, in the coke oven 10, carbonization chambers 12 are arranged between the combustion chambers 11. That is, the coke oven 10 has a configuration in which combustion chambers 11 and carbonization chambers 12 are alternately arranged. A heat storage chamber (not shown) is arranged below the combustion chamber 11 and the carbonization chamber 12. The configuration of the coke oven 10 is the same as that of a general chamber-type coke oven.

The method for repairing a coke oven of the present invention is to renew at least eight or more combustion chambers 11 kilns by transshipment repair. As described above, when the kiln mouth of the combustion chamber 11 having less than 8 is renewed by transshipment repair, there is a possibility that adverse effects may occur due to the transshipment repair in the heat retaining state. The number of kiln openings in the combustion chamber 11 to be repaired is preferably 10 or more. The upper limit of the number of kilns in the combustion chamber 11 to be repaired is not particularly limited.

Further, the method for repairing a coke oven of the present invention includes a transshipment repair step in which the coke oven 10 is placed in a heat retaining state and the transshipment repair unit is transshipped and repaired.
A well-known method can be applied to the heat insulation suspension method of the coke oven in the repair area. The combustion chamber to which the kiln mouth repair method is applied may be all the combustion chambers in the repair area, or there may be a combustion chamber in which the kiln mouth repair is not carried out because the repair has already been carried out. However, it is advisable to discharge coke from all carbonization chambers in the repair area during the heat insulation suspension.

Here, in the present specification, one row or two or more rows of continuous combustion chambers 11 among the combustion chambers 11 for transshipment repair are designated as one transshipment repair combustion chamber group 20, and among the transshipment repair combustion chamber groups 20. The part where the transshipment repair is performed is set as the transshipment repair part 21, and the part other than the transshipment repair part of the transshipment repair combustion chamber group 20 is set as the non-transshipment repair part 22. Further, the combustion chamber adjacent to the transshipment repair combustion chamber group 20 is set as the adjacent combustion chamber 30, and the combustion chambers 11 other than the transshipment repair combustion chamber group 20 and the adjacent combustion chamber 30 are set as the non-transshipment repair combustion chamber group 40. To do.
The transshipment repair unit 21 is generally set in the range of 2 to 4 flues from the kiln opening of the combustion chamber 11. This is because the flue near the kiln mouth is heavily damaged. However, the present invention is not limited to this.

Further, the coke oven repair method of the present invention controls the temperature of the adjacent combustion chamber 30 adjacent to the transshipment repair combustion chamber group 20 in the transshipment repair step, thereby controlling the temperature of the entire non-transshipment repair unit 22. Is controlled within the non-deterioration temperature range of bricks.

The “whole non-transshipment repair unit 22” refers to all the flues arranged in the non-transshipment repair unit 22. The "brick non-deterioration temperature range" is a temperature range in which the brick does not deteriorate. The bricks of the coke oven 10 (combustion chamber 11) need to be kept in a temperature range in which the bricks do not deteriorate even in the heat retention state. At temperatures below the non-deterioration temperature range of bricks, the bricks may crack or crack. Brick may melt at temperatures above the non-deteriorated temperature range. The brick non-deterioration temperature range is not particularly limited because it varies depending on the configuration of the brick used in the combustion chamber 11, but it is preferably 800 ° C. or higher and 1350 ° C. or lower. It is preferably 900 degrees or more and 1300 degrees or less, and more preferably 950 degrees or more and 1250 degrees or less.
From the above, controlling the temperature of the entire non-transshipment repair unit 22 within the brick non-deterioration temperature range means that the temperature of each flue arranged in the non-transshipment repair unit 22 is within the brick non-deterioration temperature. It means to control.

On the other hand, the temperature of the adjacent combustion chamber 30 is set for the purpose of controlling the temperature of the entire non-transshipment repair unit 22 within the brick non-deterioration temperature as described above.

Normally, combustion gas is introduced into the combustion chamber 11 from both sides of PS and CS, and the combustion gas is burned in each flue to heat the combustion chamber. However, in the transshipment repair combustion chamber group 20, one kiln opening side (for example, CS) is used as the transshipment repair unit 21, and when the kiln opening is transshipped and repaired, the combustion gas that heats the combustion chamber 11 is on the other kiln opening side. Introduced only from (eg PS). Therefore, in the non-transshipment repair unit 22, an appropriate amount of combustion gas is introduced into the flue near the kiln opening into which the combustion gas is introduced, but the amount of combustion gas introduced into the flue decreases as the distance from the kiln opening increases. Become. In the flue close to the boundary between the transshipment repair unit 21 and the non-transshipment repair unit 22, the amount of combustion gas is further reduced, and it becomes difficult to control the temperature within the non-deterioration temperature of the brick. For this reason, the temperature of the non-transshipment repair unit 22 decreases as the distance from the kiln opening side into which the combustion gas is introduced increases, and as a result, a temperature gradient is generated in the entire non-transshipment repair unit.

This was a problem that could not be solved simply by increasing the amount of combustion gas introduced. This is because when the amount of combustion gas is increased, the amount of combustion gas increases significantly in the flue on the kiln opening side where the combustion gas is introduced, but the amount of combustion gas does not increase so much in the flue far from the kiln opening. is there. As a result, the temperature gradient of the entire non-transshipment repair unit 22 expands, so that the flue on the kiln opening side where the combustion gas is introduced has a new problem of exceeding the brick non-deterioration temperature, while the transshipment repair unit 21 In the flue near the boundary between the non-transshipment repair section 22 and the non-transshipment repair section 22, there still remains the problem that the temperature is lower than the non-deterioration temperature of the brick.

In the conventional repair method in which the transshipment repair and the coke operation are performed in parallel, the combustion chambers other than the combustion chamber in which the transshipment repair is performed are heated to a high temperature for the coke operation. Therefore, due to heat transfer (heat compensation) from the combustion chamber that does not perform transshipment repair (coke operation is performed), the entire combustion chamber (non-transshipment repair section) that performs transshipment repair is within the brick non-deterioration temperature. It was controlled and such issues were not recognized. This situation is shown in FIG. The arrows in FIG. 2 conceptually represent heat transfer. The same applies to FIGS. 3 and 4.

On the other hand, since the coke operation is not performed in the heat retention pause state, heat transfer from the combustion chamber 11 without transshipment repair cannot be expected. Therefore, if the coke oven is simply put in a heat-retaining state and the transshipment repair is performed according to the conventional repair method, it is difficult to control the temperature of the entire non-transshipment repair unit 22 within the brick non-deterioration temperature range.

In response to this problem, the inventors are able to transfer heat from the adjacent combustion chamber 30 by controlling the temperature of only the adjacent combustion chamber 30 adjacent to the transshipment repair combustion chamber group 20 even in the heat retention pause state. It has been found that the temperature of the entire non-transshipment repair unit 22 can be controlled within the non-deterioration temperature range of bricks. This situation is shown in FIG.

The temperature of the adjacent combustion chamber 30 is not particularly limited, but may be controlled to be higher than the average temperature of the non-transshipment repair combustion chamber group 40. Specifically, the temperature may be controlled to be 50 to 300 degrees, preferably 100 to 200 degrees higher than the average temperature of the non-transshipment repair combustion chamber group 40. As a result, the temperature of the flue of the non-transshipment repair unit 22 far from the kiln opening into which the combustion gas is introduced can be raised by heat transfer from the adjacent combustion chamber 30. On the other hand, since the temperature of the flue of the non-transshipment repair unit 22 near the kiln where the combustion gas is introduced is equal to the temperature of the adjacent combustion chamber 30 or higher than the temperature of the adjacent combustion chamber 30, the temperature from the adjacent combustion chamber 30 is increased. The effect of heat transfer is small. In this way, by utilizing the heat transfer from the adjacent combustion chamber 30, the temperature of the low-temperature flue can be raised, and the high-temperature flue has almost no effect. Therefore, the non-transshipment repair unit It is possible to stably control the temperature of the entire 22 within the brick non-deterioration temperature range. The upper limit of the adjacent combustion chamber 30 is not particularly limited, but it may be controlled so as not to exceed the brick non-deterioration temperature range. Specifically, it may be 1300 degrees or less or 1250 degrees or less.

Here, the average temperature of the non-transshipment repair combustion chamber group 40 is the average temperature of the combustion chamber 11 belonging to the non-transshipment repair combustion chamber group 40. However, the average temperature of the non-transshipment repair combustion chamber group 40 does not include the temperature of the combustion chamber in which coke operation cannot be performed due to deterioration or damage.
The temperature of the combustion chamber 11 is the average of the temperatures of the flues located at the 1/3, 1/2, and 2/3 positions from the top by numbering the flues constituting the combustion chamber 11 from PS to CS. is there. The temperature of the flue is measured by a known method. For example, a method of measuring the temperature at the bottom of the flue using a radiation thermometer can be mentioned.

In the transshipment repair process, the temperature of the non-transshipment repair combustion chamber group 40 is also controlled within the brick non-deterioration temperature range, but it is as low as possible from the viewpoint of cost reduction because the heat insulation is suspended and coke operation is not performed. It is controlled by temperature. Specifically, it is controlled to around 1000 degrees.

Next, a specific configuration example of the transshipment repair combustion chamber group 20 will be described.
First, when the transshipment repair combustion chamber group 20 is sandwiched between the adjacent combustion chambers 30 in two rows separated from each other, the transshipment repair combustion chamber group 20 may be composed of continuous combustion chambers 11 in seven rows or less. The reason why the number of continuous combustion chambers 11 in the transshipment repair combustion chamber group 20 is 7 rows or less is that heat transfer from the adjacent combustion chambers 30 on both sides is taken into consideration.

When the transshipment repair combustion chamber group 20 is arranged on both sides of one adjacent fuel chamber 30, the case where the transshipment repair combustion chamber group 20 is arranged.
The position in the furnace length direction may be different between the transshipment repair unit 21 of one transshipment repair combustion chamber group 20 and the transshipment repair unit 21 of the other transshipment repair combustion chamber group 20. This is, for example, in a state where the transshipment repair unit 21 of one transshipment repair combustion chamber group 20 is arranged on the PS side and the transshipment repair unit 21 of the other transshipment repair combustion chamber group 20 is arranged on the CS side. is there. The reason for such an arrangement is that, especially in a gun type coke oven, if PS and CS in the same combustion chamber are repaired at the same time, the combustion gas cannot be introduced and the temperature cannot be maintained.
An example of combining these specific configurations is shown in FIG.

The repair method of the coke oven of the present invention has been described above. According to the present invention, when the number of kiln openings in the combustion chamber to be repaired is 8 or more, transshipment repair can be performed more efficiently than the conventional repair method. In addition, this makes it possible to suppress a decrease in coke production due to transshipment repair as compared with the conventional case.

Hereinafter, the present invention will be described with reference to examples, but the present invention is not limited thereto.

1. 1. Temperature control of non-transshipment repair section First, when the conventional repair method described in Patent Document 1 is used, that is, when temperature control is performed in each of the transshipment repair combustion chamber group and the other combustion chambers. The temperature of each flue in the non-transshipment repair section of the transshipment repair combustion chamber group is shown in line A of FIG. FuRyu No. in FIG. Was set to increase from the flue into which the combustion gas is introduced to the flue closer to the transshipment repair section. The dotted line represents the temperature of the combustion chambers other than the transshipment repair combustion chamber group of the conventional repair method, and the average temperature is 1020 degrees.

Further, when the conventional repair method described in Patent Document 1 is simply performed in the heat retention state, the temperature of each flue in the non-transshipment repair section of the transshipment repair combustion chamber group is shown in line B of FIG. Indicated. In this case, since the combustion chambers other than the transshipment repair combustion chamber group are in the heat retention pause state, the average temperature is set to 1000 degrees.

From FIG. 5, the conventional repair method has heat transfer from combustion chambers other than the transshipment repair combustion chamber group, particularly from the combustion chamber adjacent to the transshipment repair combustion chamber group, so that the transshipment repair combustion chamber group is not transshipped. The temperature of the repaired part could be controlled within the non-deterioration temperature range of bricks (900 degrees or more and 1300 degrees or less). On the other hand, if the conventional repair method is simply performed in the heat retention state, the influence of heat transfer from the combustion chamber adjacent to the transshipment repair combustion chamber group is small, so the flue of the non-transshipment repair unit close to the transshipment repair unit. Then it was below 900 degrees. That is, it was a temperature at which the brick could deteriorate.

Next, using the repair method of the present invention, the temperature control of the non-transshipment repair part was verified. That is, while the non-transshipment repair combustion chamber group of the coke oven is kept warm, the temperature of the adjacent combustion chamber adjacent to the transshipment repair combustion chamber group is kept within the brick non-deterioration temperature range for the entire non-transshipment repair section. It was controlled to be controlled by. Specifically, the temperature of the adjacent combustion chamber was controlled to 1000 ° C. and 1150 ° C., which are higher than the average temperature (950 ° C.) of the non-transshipment repair combustion chamber group. At this time, the amount of combustion gas introduced into the non-transshipment repair section was appropriately adjusted. The result is shown in FIG.

As shown in FIG. 6, in each case, the temperature of the entire non-transshipment repair section could be controlled within the brick non-deterioration temperature range (900 ° C. or higher and 1300 ° C. or lower). Further, when the temperature of the adjacent combustion chamber is controlled to 1150 degrees, the temperature gradient of the entire non-transshipment repair section becomes smaller than that when the temperature is controlled to 1000 degrees, and as a result, the temperature of the entire non-transshipment repair section is reduced. It was found that the temperature can be controlled to be within the stricter standard brick non-deterioration temperature range (950 ° C or higher and 1250 ° C or lower).

2. Simulation A computer was used to simulate the case of transshipping and repairing all the kilns in the combustion chamber in row 21, and the construction order was optimized. For optimization, the one with the shortest construction period was selected. The simulation was performed by each of the conventional repair method described in Patent Document 1 and the above-mentioned repair method of the present invention.
As the evaluation standard, the number of days (days / flue) required for transshipment repair of one unit of flue was adopted.

When the conventional repair method was used, it was 8.6 (day / flue). On the other hand, when the repair method of the present invention was used, it was 1.7 (day / flue). As described above, by using the repair method of the present invention, the construction period can be reduced to about 1/5 as compared with the conventional repair method.

10 Coke furnace 11 Combustion chamber 12 Carbonization chamber 20 Transshipment repair Combustion chamber group 21 Transshipment repair unit 22 Non-transshipment repair unit 30 Adjacent combustion chamber 40 Non-transshipment repair combustion chamber group

Claims (6)

A method for repairing a coke oven in which a plurality of combustion chambers are arranged in a row in the width direction of the furnace, in which at least eight or more of the kilns of the combustion chambers are renewed by transshipment repair.
In the coke furnace, the combustion chambers in which one row or two or more rows are continuous among the combustion chambers for transshipment repair are designated as the transshipment repair combustion chamber group, and the parts for transshipment repair of the transshipment repair combustion chamber group are designated. When the transshipment repair section is used and the part other than the transshipment repair section of the transshipment repair combustion chamber group is used as the non-transshipment repair section,
A transshipment repair process for transshipping and repairing the transshipment repair unit by putting the coke oven in a heat retaining state is provided.
In the transshipment repair step, the temperature of the entire non-transshipment repair unit is controlled within the brick non-deterioration temperature range by controlling the temperature of the adjacent combustion chamber adjacent to the transshipment repair combustion chamber group. To
How to repair a coke oven. In the coke oven, when the combustion chambers other than the transshipment repair combustion chamber group and the adjacent combustion chamber are designated as a non-transshipment repair combustion chamber group,
The repair method according to claim 1, wherein in the transshipment repair step, the temperature of the adjacent combustion chamber is controlled to a temperature higher than the average temperature of the non-transshipment repair combustion chamber group. The second aspect of the present invention, wherein in the transshipment repair step, the temperature of the adjacent combustion chamber is controlled to a temperature 100 to 200 degrees higher than the average temperature of the non-transshipment repair combustion chamber group. Repair method. The repair method according to any one of claims 1 to 3, wherein in the transshipment repair step, the temperature of the entire non-transshipment repair portion is controlled in the range of 950 ° C. or higher and 1250 ° C. or lower. One of claims 1 to 4, wherein the transshipment repair combustion chamber group sandwiched between the adjacent combustion chambers in two rows separated from each other is composed of seven or less continuous rows of the combustion chambers. The repair method described in. The transshipment repair combustion chamber group is arranged on both sides of the adjacent fuel chamber, and the transshipment repair unit of one of the transshipment repair combustion chamber groups and the transshipment repair of the other transshipment repair combustion chamber group. The repair method according to any one of claims 1 to 5, wherein the position in the furnace length direction is different from that of the part.