JP6753338B2 - Hot brick transshipment repair method for coke oven - Google Patents

Description

The present invention relates to a hot brick transshipment repair method for a two-split coke oven having a horizontal flame path in the upper part of a combustion chamber.

A coke oven is a facility for producing coke by carbonizing coal by indirectly heating the coal charged in the carbonization chamber with heat from an adjacent combustion chamber. In general, the coke oven 1 is provided with a heat storage chamber 30 at the bottom as shown in FIG. 1, and a combustion chamber 10 and a carbonization chamber 20 partitioned by a furnace wall constructed of bricks are alternately arranged in the furnace. Forming a group. The outer wall forming the combustion chamber 10 is the furnace wall of the adjacent carbonization chamber 20. FIG. 1 is a cross-sectional view of the coke oven 1 as viewed from the direction of the furnace group leader (the upper left side is the cross section of the combustion chamber, and the right side is the cross section of the carbonization chamber). Combustion chambers 10 and carbonization chambers 20 are arranged alternately. The combustion chamber 10 is divided into a plurality of combustion chambers called flues in the furnace length direction. Further, the heat storage chamber 30 and the combustion chamber 10 are communicated with each other, and in the lower part of the heat storage chamber 30, there are passages for fuel gas and air supplied to the combustion chamber 10 and passages for combustion exhaust gas generated as a result of combustion. The sole flue 35 is formed. The sole flue 35 is connected to fuel gas supply pipes 41 and 43 for supplying fuel gas and flues 51 and 53 for discharging combustion exhaust gas.

In order to carbonize the coal charged in the carbonization chamber 20 of the coke oven 1, it is necessary to make the temperature in the carbonization chamber 20 uniform. Therefore, there are various types of combustion structures in the combustion chamber, such as a two-piece type and a hairpin type. For example, FIG. 2 shows an example of a two-split coke oven 1. In the two-split coke oven 1, each combustion chamber 10 is divided into two, a combustion side 10A in which the fuel gas is burned and a withdrawal side 10B in which the combustion exhaust gas is drawn to the flue 51 and 53 in the direction of the furnace length. , The upper part of each combustion chamber 10 is connected by a tunnel-shaped upper horizontal flame path 15 formed over the furnace length direction of the coke oven 1. The combustion exhaust gas generated on the combustion side 10A flows to the heat storage chamber 30 through the upper horizontal flame path 15 and the withdrawal side 10B, and is discharged to the flues 51 and 53. After such combustion for 20 to 30 minutes, the combustion side 10A and the withdrawal side 10B are interchanged to perform combustion. In this way, combustion and exhaust gas withdrawal are alternately performed so that the temperature becomes uniform.

By the way, in a coke oven, the furnace wall bricks are damaged by many years of use, and in particular, the furnace wall bricks near the furnace lid are damaged because outside air flows in when the furnace lid is opened to extrude coke and receives a large temperature history. Is often manifested. If the damage is significant, hot transshipment of the damaged part of the furnace wall brick is performed. As described above, since the furnace wall of the combustion chamber is also the outer wall of the combustion chamber, transshipment of the bricks of the furnace wall means transshipment of the bricks of the combustion chamber itself. Therefore, dismantling the bricks in the carbonization chamber near the furnace lid means dismantling the bricks in the combustion chamber sharing the bricks.

Normally, during hot transshipment repair, the combustion of the flue in the repair range of the corresponding combustion chamber is stopped, while the combustion of the flue in the non-repair range is continued and the brick temperature in the non-repair range is maintained to maintain the furnace wall. Brick damage due to temperature fluctuations is suppressed. At this time, the boundary between the repaired area and the non-repaired area is covered with a heat insulating material, and the work is performed while suppressing the inflow of hot air into the repaired area. However, in a two-split coke oven, the repair range and the non-repair range are connected by the upper horizontal flame path, so the upper horizontal flame path is sealed at these boundaries, and the combustion exhaust gas is released from the non-repair range. It is necessary to prevent it from leaking.

As a countermeasure, for example, in Patent Document 1, in the partial hot transshipment repair of bricks in the combustion chamber of a two-split coke oven, two or more flue upper ends of the non-repaired portion adjacent to the transshipment portion are covered with a heat insulating material. A technique for closing a horizontal flame path cross section is disclosed. As a result, the flow of hot air in the adjacent flue is suppressed, and heat dissipation from the transshipment boundary is suppressed. Further, for example, in Patent Document 2, in the combustion chamber on the brick side where partial transshipment is performed, the inter-chamber gas passage portion communicating between the two divided chambers is temporarily closed, and the divided chambers are communicated with each other. A technique for partially transshipping bricks is disclosed in a state where the gas introduction / discharge ports in the heat storage chamber are temporarily closed. Further, Patent Document 3 discloses a technique of packing a net-like or fibrous high-temperature resistant heat insulating material to block the upper horizontal flame path in hot repair of a two-part single-stage combustion type coke oven.

Japanese Unexamined Patent Publication No. 2001-26781 Japanese Patent No. 5223875 Japanese Patent No. 3355014

However, in the technique of Patent Document 1, if two or more flues adjacent to the transshipment portion in the furnace length direction are closed in order to seal the upper horizontal flame path, combustion of the blocked flues cannot be continued. , It becomes difficult to maintain and adjust the temperature of the flue. As a result, the temperature of the flue in the non-repair range may drop, leading to brick damage in the non-repair range.

Further, in the technique of Patent Document 2, since the upper horizontal flame path and the heat storage chamber are closed, combustion in the non-repair range is completely stopped, which may lead to a decrease in the brick temperature of the combustion chamber and brick damage. There is.

Further, it is difficult to secure the airtightness against gas blowout due to gas pressure (positive pressure) from the non-repair range only by filling the net-like or fibrous high-temperature resistant heat insulating material as in the technique of Patent Document 3. Further, since the combustion chamber becomes a negative pressure when the combustion is switched, the high temperature resistant heat insulating material filled at that time may be drawn in. In hot transshipment repair work, it is necessary to seal the upper horizontal flame path for a long period of about 1 to 2 months, but a net-like or fibrous high-temperature resistant heat insulating material provides stability that can withstand long-term use. Cannot be secured.

Therefore, the present invention has been made in view of the above problems, and an object of the present invention is to enable combustion in a non-repair range flue adjacent to the repair range and to provide a temperature range in which the bricks are not damaged. The purpose is to provide a new and improved method for hot brick transshipment repair of coke ovens that can be maintained.

In order to solve the above problems, according to a certain aspect of the present invention, the carbonization chambers and the combustion chambers constructed by the brick wall are arranged alternately, and the upper horizontal flame path is provided above the combustion chambers. It is a hot brick transshipment repair method in which the bricks of the furnace wall are partially transshipped hot in the two-split coke furnace, and the repair range and non-repair range of the upper horizontal flame path for brick transshipment of the furnace wall. The first step of installing a first sealing member made of a fibrous heat insulating member at the boundary position of the above to seal the upper horizontal flame path and dismantling the upper furnace top brick of the upper horizontal flame path in the repair range. After dismantling the bricks at the top of the furnace in the repair range, the first sealing member is removed, and the upper horizontal flame path is sealed by the second sealing member made of bricks to cover the upper horizontal flame path in the repair range. The second step of disassembling the lower bricks and stacking new bricks, and after stacking new bricks at the lower part of the upper horizontal flame path, remove the second sealing member from the combustion temperature of the combustion chamber. Hot coke furnace, including a third step of sealing the upper horizontal flame path with a third sealing member made of a heat insulating material that becomes brittle at low temperatures and newly stacking the top bricks in the repair area. Brick transshipment repair methods are provided.

The first sealing member, the second sealing member, and the third sealing member are installed on the partition wall of the flue of the combustion chamber at the boundary position between the repair range and the non-repair range.

In the first step, a part of the furnace wall that separates the combustion chamber in which the first sealing member is installed and the combustion chamber adjacent to the combustion chamber is penetrated, and the first seal is made from the carbonization chamber to the combustion chamber. Push in the stop member to seal the upper horizontal flame path.

In the second step, after removing at least the first sealing member, until the second sealing member is installed, the flue hole of the furnace top brick corresponding to the installation position of the second sealing member. An air blowing member may be inserted into the upper horizontal flame path, and the air blowing member may blow air toward the non-repair range.

In the third step, after the bricks on the top of the furnace to be repaired are newly piled up, an air blowing member is inserted into the upper horizontal flame path from the flue hole of the bricks on the top of the furnace to blow air to the third sealing member. The third sealing member may be removed from the upper horizontal flame path.

For the third sealing member, for example, a heat insulating material having a heat resistant temperature of 500 ° C. to 1000 ° C. may be used.

As described above, according to the present invention, since hot transshipment repair can be performed while continuing all combustion in the flue in the non-repair range, it is possible to suppress temperature changes in the remaining bricks in the non-repair range. The soundness of bricks in the non-repair range can be maintained.

It is explanatory drawing which shows the cross-sectional view which looked at the coke oven from the direction of the furnace group leader. It is explanatory drawing which shows one configuration example of the two-split type coke oven. It is a top view of the plan of the coke oven before the start of the hot brick transshipment repair which concerns on one Embodiment of this invention. FIG. 3 is a schematic cross-sectional view of a combustion chamber at the AA cutting line of FIG. 3 and a schematic cross-sectional view of a carbonization chamber at the BB cutting line. It is a flowchart which shows the process of the hot brick transshipment repair method in the two-part type coke oven which concerns on one Embodiment of this invention. It is a schematic diagram of the combustion chamber and the carbonization chamber explaining the installation process (S100) of the first sealing member. It is a schematic diagram of the cross section in the furnace group length direction of the combustion chamber which shows the installation process of the 1st sealing member. It is a schematic diagram which shows one installation example of the 1st sealing member. It is a schematic diagram of the combustion chamber and the carbonization chamber explaining the dismantling process (S102) of the brick at the top of the furnace. It is a schematic diagram of the combustion chamber and the carbonization chamber explaining the installation process (S106) of the 2nd sealing member. It is explanatory drawing which shows an example of the brick block used as the 2nd sealing member. It is a schematic diagram of the combustion chamber and the carbonization chamber which shows the state in which the 2nd sealing member is installed. It is a schematic diagram of the combustion chamber and the carbonization chamber explaining the brick demolition step (S108) of the lower part of the upper horizontal flame path. It is a plan view of a coke oven which shows the state which the brick of the lower part of the upper horizontal flame is dismantled. It is a schematic diagram of the combustion chamber and the carbonization chamber explaining the new brick stacking process (S110) of the lower part of the upper horizontal flame path. It is a schematic diagram of the combustion chamber and the carbonization chamber which shows the state in which the 3rd sealing member is installed. It is a schematic diagram of the combustion chamber and the carbonization chamber which shows the state in which the new bricks at the top of the furnace are piled up. It is a schematic diagram of the combustion chamber and the carbonization chamber which shows the removal step (S118) of the 3rd sealing member.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the present specification and the drawings, components having substantially the same functional configuration are designated by the same reference numerals, and duplicate description will be omitted.

<1. Overview>
In the hot brick transshipment repair method in the two-split coke oven of the present invention, when the upper horizontal flame path of the combustion chamber is sealed at the boundary position between the repair range for brick transshipment of the furnace wall and the non-repair range. Different sealing members are used depending on the work stage of hot brick transshipment. This enables hot transshipment repair while continuing combustion in the flue in the non-repair range. As a result, the temperature change for the bricks in the non-repair range can be suppressed, and the soundness of the bricks in the non-repair range can be maintained.

As shown in FIG. 1, the two-split coke oven has a structure in which carbonization chambers and combustion chambers are alternately adjacent to each other in the direction of the head of the furnace. Schematic drawings of such a coke oven 1 are shown in FIGS. 3 and 4. FIG. 3 is a schematic plan view of a coke oven before the start of hot brick transshipment repair. FIG. 4 is a schematic cross-sectional view of the combustion chamber 10 at the AA cutting line of FIG. 3 and a schematic cross-sectional view of the carbonization chamber 20 at the BB cutting line. In these figures, the X direction indicates the furnace length direction, the Y direction indicates the furnace group length direction, and the Z direction indicates the furnace height direction.

Both ends of the combustion chamber 10 in the furnace length direction are supported by back stays 5. As shown in FIG. 3, in the combustion chamber 10, a plurality of combustion chambers called flues 13 are arranged in one combustion chamber in the furnace length direction. Each flue 13 is partitioned in the furnace length direction by a partition wall (binder brick) 11, but in a two-split coke oven, the upper part of the flue 13 communicates as shown in FIG. This communication portion is called the upper horizontal flame path 15, and serves as a path for combustion exhaust gas. The upper horizontal flame path 15 is formed by covering the upper part of each flue 13 with a brick at the top of the furnace in a tunnel shape. The brick 17 at the top of the furnace is provided with a flue hole 19 at a position corresponding to each flue 13.

The carbonization chamber 20 is a space in which coke is charged between the combustion chamber 10 and the combustion chamber 10 adjacent to each other in the direction of the furnace leader. As shown in FIG. 4, an charging hole 21 for charging coal as a raw material and a discharge pipe 23 for discharging coke oven gas are provided in the upper part of the carbonization chamber 20.

In such a coke oven, for example, it is assumed that the bricks are transshipped with the range from the kiln mouth to the predetermined flue 13 as the repair range T. In general, hot transshipment repair of a coke oven is a repair in which dismantling is started from the top brick 17 and dismantled to the bottom level Lb, and then bricks are constructed in order from the bottom level Lb toward the top. .. Here, during the repair, in order to protect the bricks, combustion must be continued in the non-repair range and the furnace wall temperature must be maintained at a predetermined temperature. However, in the hot transshipment repair of the two-split coke oven, since the upper horizontal flame path 15 is connected by the repair range T and the non-repair range, the upper horizontal so as to separate the repair range T and the non-repair range. If the flame path 15 is not sealed, combustion exhaust gas and hot air will be blown from the non-repair range to the repair range T. Further, since it is necessary to continue combustion in the non-repair range to maintain the temperature, it is desirable to seal the upper horizontal flame path 15 without blocking the flue adjacent to the repair range T.

From the above, in the hot brick transshipment repair method in the two-split coke oven of the present invention, the upper horizontal flame path 15 is sealed at the boundary position between the repair range and the non-repair range. The hot brick transshipment repair method will be described in detail below.

<2. Hot brick transshipment repair method ＞
Hereinafter, a hot brick transshipment repair method in a two-split coke oven according to an embodiment of the present invention will be described with reference to FIGS. 5 to 18. FIG. 5 is a flowchart showing a process of a hot brick transshipment repair method in a two-split coke oven according to the present embodiment. 6 to 18 are explanatory views for explaining each step of the hot brick transshipment repair method according to the present embodiment.

In the hot brick transshipment repair method according to the present embodiment, dismantling is started from the furnace top brick 17 and dismantled to the furnace bottom level Lb as in the conventional case, and then bricks are sequentially disassembled from the furnace bottom level Lb toward the furnace top. To build. Specifically, the first step of dismantling the upper furnace top brick 17 of the upper horizontal flame path 15 of the repair range T, the lower brick of the upper horizontal flame path 15 of the repair range T is dismantled, and a new brick is used. It consists of a second step of stacking and a third step of newly stacking bricks at the top of the furnace in the repair range T.

[First step (brick dismantling at the top of the furnace)]
The hot brick transshipment of the coke oven is started by first installing the first sealing member on the upper horizontal flame path 15 (S100). Before the start of the hot brick transshipment work, as shown in FIG. 4, since there is no partition between the repair range and the non-repair range in the upper horizontal flame path 15, combustion and combustion exhaust gas are discharged in the repair range and the non-repair range. Exhaust is taking place. In step S100, a first sealing member is installed at a boundary position between the repair range T and the non-repair range in order to promote cooling of the repair range T.

The first sealing member is inserted from the carbonization chamber 20 adjacent to the combustion chamber 10 in the repair range T by partially disassembling the furnace top brick 17 at the position of the upper horizontal flame path 15. As shown in FIG. 6, the dismantling position of the top brick 17 in the furnace length direction is the position of the partition wall 11a on the non-repair range side of the partition walls 11 at the boundary between the repair range T and the non-repair range. To do. For example, as shown in FIG. 7, when the combustion chamber 10 is viewed from the furnace length direction, the portion of the brick 17 at the top of the furnace adjacent to the carbonization chamber 20 of the upper horizontal flame path 15 is the dismantled portion S. When the brick 17 at the top of the furnace is dismantled, the carbonization chamber 20 and the upper horizontal flame path 15 are in communication with each other. The first sealing member from the carbonization chamber 20 is inserted into the upper horizontal flame path 15 through the disassembled portion S, and as shown in FIG. 6, the partition wall 11a at the boundary position between the repair range T and the non-repair range T is inserted. A first sealing member 71 is installed on the upper horizontal flame path 15 to seal the upper horizontal flame path 15. As a result, the flue in the non-repair range can continue to burn including the flue 13a adjacent to the repair range T.

Here, the first sealing member 71 that seals the upper horizontal flame path 15 is inserted into the upper horizontal flame path 15 from a slightly disassembled portion of the furnace top brick 17, and thus has heat resistance. Those that are easy to install on the upper horizontal flame path 15 are preferable. Examples of such a member include a fibrous heat insulating member such as rock wool. When a fibrous heat insulating member is used, it is preferable to use two different sizes of the fibrous heat insulating member in order to make it easier to install and to improve the blocking property, for example, as shown in FIG. Specifically, first, the upper horizontal flame path 15 is roughly closed by the large-sized first fibrous heat insulating member 71a, and then the small-sized second fibrous heat insulating member 71b is placed between the first fibrous heat insulating members 71a. Embed. As a result, the time for the operator to receive the hot air of high temperature can be shortened, and the upper horizontal flame path 15 can be more reliably sealed.

After sealing the upper horizontal flame path 15 with the first sealing member 71, the furnace top brick 17 constituting the upper horizontal flame path 15 in the repair range T is dismantled (S102). The furnace top brick 17 constituting the upper horizontal flame path 15 is disassembled, and as shown in FIG. 9, the first sealing member 71 for sealing the upper horizontal flame path 15 is exposed. The first sealing member 71 remains installed until the dismantling of the brick 17 at the top of the furnace is completed.

[Second step (demolition and stacking of bricks at the bottom of the upper horizontal flame path)]
When the dismantling of the furnace top brick 17 is completed, the first sealing member 71 is removed (S104), and the upper horizontal flame path 15 is sealed with the second sealing member (S106). Since the first sealing member 71 must perform the work of sealing the upper horizontal flame path 15 in a limited space, the shape of the fibrous heat insulating member or the like can be easily deformed in consideration of workability. A member that is easy to install was used. On the other hand, it takes about one month to dismantle the bricks (the furnace wall and the partition wall constituting the combustion chamber and the carbonization chamber) and to stack new bricks in the lower part of the upper horizontal flame path 15. In the first sealing member 71, since the sealing member was selected with an emphasis on workability, it is desirable to select a more durable member in order to seal the upper horizontal flame path 15 for a long period of time. Therefore, in the present embodiment, the first sealing member 71 is removed and a second sealing member having higher durability is newly installed before dismantling the brick below the upper horizontal flame path 15.

As the second sealing member, a member made of a material having high durability in a high temperature environment is desirable with an emphasis on long-term stability, and for example, bricks are used. Since the installation work of the second sealing member 73 is performed in front of the upper horizontal flame path 15, the operator will work while receiving the high-temperature combustion exhaust gas. Therefore, in consideration of the safety of the operator and the ease of work, for example, as shown in FIG. 10, from the flue hole 19 near the position where the second sealing member 73 is installed on the non-repair range side. , The air blowing member 80 that blows out air may be inserted into the upper horizontal flame path 15 to inject air toward the non-repair range side. As a result, the hot air flowing through the upper horizontal flame path 15 from the non-repair range side to the repair range side can be pushed back to the non-repair range side to create a work environment that is easy for the operator to work.

Further, when bricks are used as the second sealing member 73, in order to efficiently seal the upper horizontal flame path 15, for example, as shown in FIG. 11, when combined, the opening of the upper horizontal flame path 15 is opened. A plurality of brick blocks 73a to 73h having a shape may be formed in advance. Then, brick blocks 73a to 73h are stacked in the opening of the upper horizontal flame path 15, and after sealing the upper horizontal flame path 15, the brick joint material (mortar) is brick-blocked in order to seal the upper horizontal flame path 15. It may be applied to the entire surface of 73a to 73h.

As shown in FIG. 12, when the installation of the second sealing member 73 is completed, the bricks at the lower part of the upper horizontal flame path 15 are dismantled (S108). At this time, the second sealing member 73 is still installed, and the flue in the non-repair range continues to burn including the flue 13a adjacent to the repair range T. Then, as shown in FIG. 13, the bricks are dismantled to the bottom level Lb. When the bricks are dismantled, the bricks in the non-repair area will be exposed. Therefore, in order to protect the exposed bricks in the non-repair area, the entire surface of the bricks is covered with a fibrous heat insulating material and heat insulation (insulation) measures are taken. Is desirable. After dismantling the bricks in the repair range shown in FIG. 3, as shown in FIG. 14, the bricks in the vicinity of the furnace lids of the two central combustion chambers 10 are in a state of being removed. From this state, new bricks are piled up, and as shown in FIG. 15, the brick-laying work is carried out up to just below the upper horizontal flame path 15 (S110). Range N in FIG. 15 indicates the location where the new brick was installed.

[Third step (brick stacking at the top of the furnace)]
When the bricks are piled up to just below the upper horizontal flame path 15, the second sealing member 73 is removed (S112), and the upper horizontal flame path 15 is sealed with the third sealing member (S114). The second sealing member 73 used a highly durable member such as a brick in order to stably seal the upper horizontal flame path 15 for a long period of time, but the second sealing member 73 is the upper horizontal. Since it is firmly fixed to the bricks forming the flame path 15, it cannot be easily removed. For this reason, it is difficult to remove the second sealing member 73 covered with the furnace top brick 17 after stacking new furnace top bricks 17, and if the second sealing member 73 cannot be removed, it will be repaired. The brick 13 cannot be utilized. Therefore, in the present embodiment, the second sealing member 73 is removed before the new bricks 17 at the top of the furnace are piled up, and a third sealing member 75 that can be easily removed after the repair work is newly installed. To do.

As the third sealing member, a member that can be easily removed after the repair work is completed and that does not hinder the subsequent combustion is desirable, and a heat insulating material that embrittles at a temperature lower than the combustion temperature of the combustion chamber, for example, a heat resistant temperature of 500. A member or the like made of a material which is from ° C to 1000 ° C and becomes brittle at a temperature exceeding 1000 ° C is used. Since the third sealing member is required to be embrittled at a temperature lower than the temperature of the combustion chamber, the upper limit of the heat resistant temperature is set to 1000 ° C. On the other hand, since it is necessary that the upper horizontal flame path 15 is installed and does not become embrittlement immediately, the lower limit of the heat resistant temperature is set to 500 ° C. Examples of such a member include a non-combustible board such as a calcium silicate board (so-called calcium silicate board). The calcium silicate plate has a heat resistance of about 650 ° C. As long as it has heat resistance of about half the maximum temperature (about 1300 ° C.) of the combustion chamber, the third sealing member is installed in the upper horizontal flame path 15 and does not become embrittlement immediately. Further, even if the third sealing member becomes slightly brittle after being installed in the upper horizontal flame path 15, there is no problem as long as the combustion exhaust gas can be blocked. Further, as will be described later, since the third sealing member is removed by impact, the third sealing member can be removed with a slight impact by blocking the combustion exhaust gas and making it slightly embrittled. Will be.

The third sealing member has a shape corresponding to the cross-sectional shape of the upper horizontal flame path 15, and after the removal of the second sealing member 73, as shown in FIG. 16, the second sealing member 73 It is pushed into the position where it was installed and installed. Then, when the furnace top brick 17 is newly installed in the repair range T (S116), as shown in FIG. 17, the third sealing member 75 is in a state of being covered with the furnace top brick 17.

When the brick stacking is completed, the third sealing member 75 is finally removed from the upper horizontal flame path 15 (S118). As described above, since the third sealing member 75 is covered with bricks, it cannot be taken out of the furnace. Therefore, in the present embodiment, an impact is applied to the third sealing member 75, and the third sealing member 75 is dropped from the upper horizontal flame path 15 into the flue 13. As a method of giving an impact to the third sealing member 75, for example, as shown in FIG. 18, an air blowing member 80 is inserted from the flue hole 19 into the upper horizontal flame path 15 to the third sealing member 75. There are methods such as injecting air and giving an impact using a tool such as a stick. When the third sealing member 75 is separated from the upper horizontal flame path 15, the upper horizontal flame path 15 is in a state of being communicated between the repair range and the non-repair range, and combustion in the repair range can be restarted. Since the third sealing member is embrittled by heat, it does not hinder the subsequent combustion.

The hot brick transshipment repair method in the two-split coke oven according to the embodiment of the present invention has been described above. In such a repair method, when sealing the upper horizontal flame path of the combustion chamber at the boundary position between the repair range where the brick wall is transshipped and the non-repair range, different sealing is performed depending on the work stage of the hot brick transshipment. Use members. That is, in the first step of disassembling the upper furnace top brick 17 of the upper horizontal flame path of the repair range, the upper horizontal flame path is sealed with a fibrous heat insulating member in consideration of workability, and the upper horizontal flame path of the repair range is upper horizontal. In the second step of dismantling the bricks at the bottom of the flame path and stacking new bricks, the upper horizontal flame path is sealed with bricks in consideration of sealing the upper horizontal flame path stably for a long period of time. .. Then, in the third step of newly stacking the bricks at the top of the furnace in the repair range, the upper horizontal flame path is sealed with a calcium silicate plate in consideration of the ease of removal after the repair is completed. This enables hot transshipment repair while continuing all combustion in the non-repair range flue. As a result, the temperature change with respect to the remaining bricks in the non-repair range can be suppressed, and the soundness of the bricks in the non-repair range can be maintained. In addition, since the blowing of hot air from the upper horizontal flame path to the worker is suppressed, the working time can be shortened.

Hot brick transshipment repair in a split coke oven was carried out by the following procedure. First, in the first step of dismantling the brick at the top of the furnace, the upper horizontal flame path was sealed with the first sealing member in order to promote the cooling of the brick in the repair range before the start of the brick dismantling. In installing the first sealing member, the brick at the horizontal flue position was partially dismantled from the carbonization chamber to form a state in which the first sealing member could be installed from the carbonization chamber to the upper horizontal flame path. The dismantling range of the carbonization chamber at this time was minimized. Since the period from dismantling the bricks at the top of the furnace to starting dismantling of the bricks at the bottom of the upper horizontal flame path is as short as several days, in consideration of workability, a fibrous material is used as the first sealing member. It was filled with a high temperature heat insulating material (heat insulating wool, heat resistant temperature of 1000 ° C. or higher). In the installation work of the first sealing member, the high-temperature heat insulating material was pushed from the carbonization chamber through the brick dismantling portion into the upper horizontal flame path portion. The high temperature insulation was installed on the combustion chamber partition wall at the boundary between the flue in the repair range and the flue in the non-repair range. Even after the installation of the first sealing member was completed, the combustion of the flue adjacent to the boundary position was continued.

After dismantling the bricks at the top of the furnace, in performing the second step of dismantling and stacking the bricks at the bottom of the upper horizontal flame path, after removing the high-temperature heat insulating material which is the first sealing member, the second step is placed at the same position. As the sealing member of No. 2, brick blocks in which bricks were formed in a block shape in advance were piled up. Since the brick block is finally dismantled and removed, no brick joint material (mortar) was applied to the top and bottom of the brick block when stacking the brick block. For the brick blocks to be stacked on the upper horizontal flame path, the repair range side is open to the atmosphere and the non-repair range side is the combustion chamber temperature, so it is desirable to select a material that can withstand temperature changes (thermal shock). Therefore, in this embodiment, heat insulating brick was selected as the second sealing member.

After stacking the brick blocks, a brick joint material (mortar) was applied to the front surface (repair range side) of the brick blocks, and a sealing measure was applied so that combustion exhaust gas and hot air would not leak from the gaps between the brick blocks. After that, in order to protect the bricks in the surrounding non-repair area, the entire exposed brick surface in the non-repair area was covered with a fibrous heat insulating material, and heat insulation (insulation) treatment was taken. The brick block, which is the second sealing member, was not dismantled during the subsequent dismantling of the bricks and new brickwork, and was installed for about one month. Combustion in the non-repair range continued on all flues, but there were no gas leaks or hot air blown out from the sealing member installation position.

After stacking new bricks in the lower part of the upper horizontal flame path, a third step of stacking bricks at the top of the furnace was performed. At this time, the brick block used as the second sealing member was removed before stacking the bricks at the top of the furnace. After removal, a heat insulating material that was previously processed into the cross-sectional shape of the upper horizontal flame and became brittle at high temperature was fitted into the opening of the upper horizontal flame as a third sealing member and installed. As the high-temperature heat insulating material, a caucal board having a heat resistant temperature of 650 ° C. was used. After sealing the upper horizontal flame, brickwork was carried out at the top of the furnace, and all the remaining brickwork was carried out. After the brickwork is completed, an air pipe, which is an air blowing member, is inserted from the flue hole provided at the top of the furnace, and air is injected into the caical board that sealed the upper horizontal flame path to blow off the cacal board. , Dropped to the bottom of the flue. As a result, the upper horizontal flame path between the non-repair range and the repair range was communicated, and combustion at all flues including the repair range was restarted. The caical board that fell to the bottom of the flue became brittle as the temperature of the flue increased, so that the flue was not blocked and there was no effect on combustion.

As described above, by applying the hot brick transshipment repair method of the present invention, it is possible to burn in the flue in the non-repair range adjacent to the repair range, and it is possible to maintain a temperature range in which the brick is not damaged.

The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to these examples. It is clear that a person having ordinary knowledge in the field of technology to which the present invention belongs can come up with various modifications or modifications within the scope of the technical ideas described in the claims. , These are also naturally understood to belong to the technical scope of the present invention.

1 coke oven 5 backstay 10 combustion chamber 11 partition wall (binder brick)
13 Flue 15 Upper horizontal flame path 17 Furnace top brick 19 Flue hole 20 Carbonization chamber 21 Insertion hole 23 Discharge pipe 30 Heat storage chamber 35 Sole flue 41, 43 Fuel gas supply pipe 51, 53 Smoke channel 71 First sealing member 71a 1st fibrous heat insulating member 71b 2nd fibrous heat insulating member 73 2nd sealing member 73a to 73h Brick block 75 3rd sealing member 80 Air blowing member

Claims (6)

In a two-part coke oven in which the combustion chambers and the combustion chambers constructed by the brick wall are alternately arranged and the upper horizontal flame path is provided above the combustion chamber, the bricks of the furnace wall are hotly divided. It is a hot brick transshipment repair method for transshipment.
A first sealing member made of a fibrous heat insulating member is installed at a boundary position of the upper horizontal flame path between the repair range for brick transshipment of the furnace wall and the non-repair range to seal the upper horizontal flame path. The first step of stopping and dismantling the brick at the top of the upper horizontal flame path in the repair range, and
After dismantling the furnace top brick in the repair range, the first sealing member is removed, and the upper horizontal flame path is sealed by the second sealing member made of brick to seal the upper horizontal flame path in the repair range. The second process of dismantling the bricks at the bottom of the horizontal flame path and stacking new bricks,
After stacking new bricks under the upper horizontal flame path, the second sealing member is removed, and a third sealing made of a heat insulating material that becomes brittle at a temperature lower than the combustion temperature of the combustion chamber. A third step of sealing the upper horizontal flame path with a member and newly stacking the top bricks in the repair range, and
Hot brick transshipment repair method for coke ovens, including. The first sealing member, the second sealing member, and the third sealing member are on the partition wall of the flue of the combustion chamber at the boundary position between the repair range and the non-repair range. The hot brick transshipment repair method for a coke oven according to claim 1, which is installed in. In the first step,
A part of the furnace wall that separates the combustion chamber in which the first sealing member is installed and the carbonization chamber adjacent to the combustion chamber is penetrated, and the first sealing is made from the carbonization chamber to the combustion chamber. The method for repairing hot bricks in a coke oven according to claim 1 or 2, wherein a stop member is pushed in to seal the upper horizontal flame path. In the second step, after removing at least the first sealing member, until the second sealing member is installed, the furnace corresponding to the installation position of the second sealing member. The coke according to any one of claims 1 to 3, wherein an air blowing member is inserted into the upper horizontal flame path from a flue hole of a top brick, and air is blown toward the non-repair range by the air blowing member. Hot brick transshipment repair method for furnaces. In the third step, after the furnace top bricks in the repair range are newly piled up, an air blowing member is inserted into the upper horizontal flame path from the flue hole of the furnace top brick to insert the third sealing member. The method for repairing hot bricks in a coke oven according to any one of claims 1 to 4, wherein air is blown into the coke oven to remove the third sealing member from the upper horizontal flame path. The method for repairing hot bricks in a coke oven according to any one of claims 1 to 5, wherein the third sealing member is a heat insulating material having a heat resistant temperature of 500 ° C. to 1000 ° C.

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