KR101385416B1 - Method for repairing coke oven - Google Patents

Abstract

The present invention has a structure in which each combustion chamber 2 is divided into two chambers, each having a separate heat storage chamber 6 communicating with each chamber, and also allowing passage of gas between the two divided chambers. It is a repair method which replaces and repairs brick partly in the hot target for the coke oven which has the gas passage part 5. In this method, the interstitial gas passage part 5 which communicates between two chambers which comprise the combustion chamber 2 of the brick side which performs partial replacement is blocked, and is connected to the heat storage chamber 6 which communicates with each divided chamber | room. A partial replacement of the bricks is performed in a state where the gas inlet and outlet 7 in each is closed.

Description

METHOD FOR REPAIRING COKE OVEN [0002]

The present invention relates to a coke oven repair method for repairing a coke oven by partially replacing the carbonization chamber brick constituting the furnace wall separating the carbonization chamber and the combustion chamber.

The coke furnace is configured by alternately arranging a carbonization chamber and a combustion chamber for supplying heat to the carbonization chamber in the furnace width direction. In this coke furnace, heat is supplied from the combustion chamber to the carbonization chamber through the furnace wall (carbonation brick) of the carbonization chamber which separates the carbonization chamber and the combustion chamber. The coal put into the carbonization chamber is carbonized into coke by being heated by heat supplied from the combustion chamber, and the generated coke is pushed out of the kiln inlet of one of the carbonization chambers.

Carbon fiber bricks are subjected to severe heat cycles due to repeated operations. The coke furnace is used continuously until it cools down to room temperature, and a volume change that rapidly decreases in the carbonization chamber brick occurs. For this reason, the coke oven checks the carbonization chamber brick for damage such as cracks or cracks, and if necessary, repairs by thermal spraying or partially repair the carbonization chamber brick by hot replacement. The job is running.

The partial maintenance work of the carbonization chamber brick by hot replacement is performed by the method as described in patent document 1, for example. In this method, operation of the carbonization chamber which carries out hot replacement is temporarily stopped, the insulation brick construction is performed for the carbonization chamber bricks, leaving the range for performing the replacement work, and then the carbonization chamber bricks of the repair part are replaced.

Japanese Patent Publication No. 2008-169315

According to the said method, the temperature of the part which performs partial replacement falls to a working atmosphere. At this time, in order to protect the carbonization chamber brick (the existing brick) which does not perform replacement, it is necessary to perform heat retention of the existing brick. For this reason, in the said method, the temperature for heat retention is ensured by continuing combustion of the furnace of the existing brick side.

However, when combustion of the furnace on the existing brick side is continued, the combustion chamber on the existing brick side becomes negative pressure by the chimney draft. For this reason, air suction generate | occur | produces in the joint vicinity of the old and new brick which exists in the vicinity of the boundary of partial replacement, and a temperature fall occurs in an existing brick. This decrease in temperature leads to deterioration of the life of the existing bricks. For this reason, in the said method, it is necessary to reliably perform heat insulation construction so that there may be no gap.

In addition, when the combustion of the furnace on the existing brick side is continued, double blocking of gas cannot be performed at the time of maintenance work in the room. For this reason, in the said method, the worker who works indoors is inevitably attached to an airline, and it is necessary to fully implement safety measures.

SUMMARY OF THE INVENTION The present invention has been made in view of the above, and an object thereof is to repair a coke oven that can facilitate a partial replacement operation of a carbonization chamber brick while maintaining a temperature drop of an existing brick that does not perform repair. Is to provide.

The present invention has a structure in which each combustion chamber is divided into two chambers, and has a separate heat storage chamber communicating with the chambers, and also allows passage of gas between the divided chambers (inter chamber). As a method of repairing a coke oven for repairing by partially replacing and repairing a carbon chamber brick constituting a furnace wall of a carbonization chamber that separates a combustion chamber and a carbonization chamber for a coke oven having an inter-gas passage portion to be made, In the combustion chamber on the side of the brick that performs the step, the intermittent gas passage portion communicating between the two divided chambers is temporarily closed, and the gas introduction discharge ports in the heat storage chamber communicating with each divided chamber are temporarily closed. In the closed state, partial replacement of the brick is performed.

The present invention relates to a coke oven repair method for partially replacing and repairing a carbonization chamber brick constituting a furnace wall of a carbonization chamber separating a combustion chamber and a carbonization chamber, and communicating with the combustion chamber on the brick side for performing partial replacement. In the combustion chamber on the side of the brick which closes the gas introduction outlet of the heat storage chamber and performs the partial replacement, the vertical flue of the portion that performs the partial replacement and the communication portion of the vertical flue that does not perform the replacement are blocked. In, perform a partial replacement of the brick.

According to the present invention, it is possible to facilitate the partial replacement work of the carbonization chamber brick in the hot state while suppressing the temperature drop of the existing brick which does not perform the repair.

BRIEF DESCRIPTION OF THE DRAWINGS It is a top view which shows the structure of the coke oven which is one Embodiment of this invention.
It is a side view which shows the structure of the combustion chamber and heat storage chamber which are one Embodiment of this invention.
It is a figure which shows the structure of the real gas passage part which is one Embodiment of this invention.
It is a top view of the coke oven for demonstrating the partial repair method which is one Embodiment of this invention.
5 is a side view of the combustion chamber and the heat storage chamber for explaining the partial repair method according to the embodiment of the present invention.
It is a figure which shows the structural example of a 1st closure member.
It is a figure which shows the example of blockage of the real gas passage part.
It is a figure which shows the structural example of a heat insulation block.
It is a figure which shows the example of arrangement | positioning of a heat insulation block.

Next, embodiment of this invention is described, referring drawings. In the present embodiment, as a coke oven, a car still coke oven will be described as an example. The steel steel coke furnace has a two-part subtraction structure for both the combustion chamber and the heat storage chamber. In other words, while the steel still coke furnace introduces air and empty gas from one chamber of the combustion chamber and the heat storage chamber, it alternately alternately switches the treatment of discharging waste gas from the chamber of the combustion chamber and the other chamber of the heat storage chamber. Perform combustion.

[Configuration of the furnace]

As shown in FIG. 1, the coke furnace of the present embodiment has a structure in which the carbonization chamber 1 and the combustion chamber 2 are alternately arranged. The carbonization chamber 1 is spaced apart from the combustion chambers 2 adjacent to each other by the carbonization chamber bricks 3 constituting the furnace wall of the carbonization chamber 1.

As shown in FIG. 1 and FIG. 2, each combustion chamber 2 is partitioned into a plurality of vertical flues 2a at predetermined intervals along the furnace length direction by partition bricks 4 such as vertical flue bricks. Upper portions of the plurality of vertical flues 2a communicate with each other. That is, the upper part of the vertical flue 2a communicates with the upper horizontal flue 2b. Each combustion chamber 2 is divided into two chambers, a first combustion chamber 2A and a second combustion chamber 2B at a position in the longitudinal direction. The upper horizontal flue 2b is divided into two at a boundary position between the first combustion chamber 2A and the second combustion chamber 2B. The 1st combustion chamber 2A and the 2nd combustion chamber 2B are in the state which communicated by the 1 or 2 or more inter-cylinder gas passage part 5 which consists of an opening as shown in FIG.

As shown in FIG. 2, an individual heat storage chamber 6 is disposed below each combustion chamber 2. Each heat storage chamber 6 communicates with a lower portion of each vertical flue 2a. The heat storage chamber 6 is divided into two chambers of the first heat storage chamber 6A and the second heat storage chamber 6B at the intermediate position in the longitudinal direction corresponding to the two-divided structure of the combustion chamber 2. The first heat storage chamber 6A and the second heat storage chamber 6B are independent. Each of the first heat storage chamber 6A and the second heat storage chamber 6B is provided with a separate gas introduction outlet 7 for introducing gas from the outside and discharging the gas to the outside.

[How to repair]

As shown in FIG. 4, the carbonization chamber brick of the carbonization chamber 1 of # 64 and # 65 is made into repair object, and the 1st combustion chamber 2A side in the carbonization chamber 1 of the # 64 and # 65 is carried out. (Thread on the left side in FIG. 4) A part of the carbonization chamber brick 3 (region R shown in FIG. 4) will be described taking an example of performing partial repair in the hot.

In this maintenance method, the worker initially performs a maintenance preparation work. Specifically, the worker is a combustion chamber 2 of X65 located between the carbonization chambers 1 of # 64 and # 65, that is, the combustion chamber 2 of X65 on the brick side to be partially repaired, and the combustion chamber 2 of X65. The occlusion process is performed for the heat storage chamber 6 which communicates with. That is, as shown in FIG. 5, a worker removes each gas introduction discharge port 7 which communicates with the 1st heat storage chamber 6A and the 2nd heat storage chamber 6B which respectively comprise the heat storage chamber 6, respectively. 1 is blocked by the blocking member 10.

The first closure member 10 has a structure as shown in FIG. 6. That is, as shown in FIG. 6, the 1st closure member 10 is the shielding board 10b standing up on the horizontal board 10a, and the heat insulating member 10c which has elasticity which covers the periphery of the shielding board 10b. Equipped with. The shield plate 10b is made of, for example, a steel sheet. The heat insulating member 10c is made of ceramic wool, for example, and is attached to the entire circumference of the shielding plate 10b by winding the ceramic wool around the shielding plate 10b. The shielding plate 10b is formed in a shape slightly smaller than the cross-sectional shape of the inlet of the gas inlet and outlet 7, and can be inserted into the inlet of the gas inlet and outlet 7. Since the circumference | surroundings of the shielding plate 10b are covered with the heat insulation member 10c, the clearance gap between the gas introduction discharge port 7 and the shielding plate 10b is sealed (sealed) by the heat insulation member 10c. That is, the heat insulating member 10c becomes a sealing member. The first blocking member 10 is not limited to the above configuration, and can be used as the first blocking member 10 as long as it has a structure capable of sealing and sealing the gas inlet and outlet 7.

Next, the worker closes the inter-cylinder gas passage 5 communicating the first combustion chamber 2A and the second combustion chamber 2B in the combustion chamber 2 of X65 with the second blocking member. As the 2nd blocking member, what wound the ceramic wool 11 in roll shape may be used, for example. As shown in FIG. 7, by inserting the ceramic wool 11 wound in a roll shape into the real gas passing part 5, the real gas passing part 5 is blocked by the elasticity of the ceramic wool 11. Can be. As shown in FIG. 5, the heat insulation member which consists of ceramic wool etc. also with respect to the upper horizontal flue 2b located in the boundary of the brick which performs replacement in 2 A of 1st combustion chambers used as a maintenance side, and the brick of a comparative body ( 12) to block.

Next, as shown in FIG. 4, the worker moves the heat insulation block into the position of code | symbol 50 in the carbonization chamber 1 of # 64 and # 65 from the carbonization chamber 1 door side of the maintenance side (left side of FIG. 4). The heat insulation block is piled up in the non-repair side position rather than the boundary position of the carbonization chamber brick 3 and the non-repair carbonization chamber brick 3 which are put and partially repaired. Thereby, the boundary of a maintenance side and a non-maintenance side can be interrupted | blocked by a heat insulation block in a heat insulation state. Charging into an interior of a heat insulation block may be carried out using a conveyance trolley as described, for example in Unexamined-Japanese-Patent No. 2009-286835.

As shown in FIG. 8, the heat insulation block 13 binds the band 13b which made the plate-shaped or block-shaped ceramic wool 13a twisted, and made it into the compressed state. As shown in FIG. 9, after arranging the heat insulation block 13 in the above-mentioned position in the carbonization chamber 1, the band 13b is peeled off, and the ceramic wool of a compressed state returns to its original magnitude by its restoring force. It is possible to close the carbonization chamber 1 into two chambers temporarily.

Next, after the occlusion process, a worker removes the carbonization chamber brick (brick on the combustion chamber 2 side of X64 and X66) of the non-maintenance side in the carbonization chamber 1 made into object, as shown in FIG. By thermally insulating and insulating the heat insulating material 14, heat insulation of the brick of the combustion chamber 2 side of X64 and X66 is ensured.

Next, as shown in FIG. 9, the worker is a boundary between the partially repaired carbonization chamber brick 3 and the non-maintenance carbonization chamber brick 3, which are just in front of the stacked insulating blocks 13 (repair side). In the vicinity of the position, the protrusion preventing member 15 is disposed. The protrusion preventing member 15 is sandwiched between the furnace walls facing the carbonization chamber 1, thereby preventing the carbonization chamber brick 3 from protruding to the carbonization chamber 1 side. The protrusion prevention member 15 of this embodiment is implement | positioned by arrange | positioning a support brick.

The supporting bricks are formed by arranging two parallel bricks in a lateral direction so as to be sandwiched between opposing furnace walls. The worker arranges the jaws made of these two parallel bricks at predetermined intervals in the vertical direction. The worker holds the height position by arranging the strut bricks facing up and down in the longitudinal direction so as to hold and support between the up and down parallel bricks. The worker processes the parallel bricks to the dimensions of the carbonization chamber 1. When arranging the support bricks before the temperature increase, the worker has a slight allowance between the support bricks and the furnace wall, so that the projection of the some carbonization chamber bricks 3 is allowed. That is, the worker prevents the supporting brick from excessively restraining the carbonization chamber brick 3.

The worker may install the supporting bricks before dismantling the bricks, and may use the supporting bricks to prevent protrusion of the brick walls due to the temperature drop at the time of brick dismantling. The occlusion of the real gas passage part 5 may be performed after installation of the heat insulation block 13. In this state, the worker replaces the brick with respect to the carbonization chamber brick 3 to be partially repaired and the partition brick 4 located between the carbonization chamber brick 3.

Next, the worker releases the blocking member from the gas introduction outlet 7 and the interstitial gas passage part 5, and then, in the state where the supporting brick as the protruding prevention member 15 is installed, the transformation point of the furnace brick (for example, For example, the temperature is raised to 600 ° C or higher. When the worker raises the temperature to the target temperature, the supporting brick is torn down by inserting and pushing or pulling a long rod-shaped jig from the inlet of the kiln to remove the insulating material such as the supporting brick or the insulating block.

Next, the worker fills the joint by spraying the spraying material on the joint between the non-maintenance part and the repair part. At this time, it is ideal that there is no protrusion by expansion absorption. In practice, however, there is a deformation that slightly protrudes around the boundary. The main reason is considered that the expansion characteristics of the existing bricks and the new bricks are different. For this reason, the worker performs thermal spraying on the part which protruded deformation generate | occur | produced other than a boundary part.

Finally, the worker cuts and deforms the deformation | transformation part which protruded to the carbonization chamber 1 side with grinding | polishing apparatus, such as a sand blast. The worker then resumes operation of the furnace.

In the repair method of the coke oven of this embodiment, a worker stops the introduction and discharge of the gas flow into the combustion chamber 2 in which a part of the furnace wall is formed by the carbonization chamber brick 3 which is the object of partial replacement, The combustion chamber 2 of the existing brick portion which does not perform replacement is prevented from becoming negative pressure. At this time, the 2nd heat storage chamber 6B of the side which does not repair, and the 1st combustion chamber 1B which communicates with the 2nd heat storage chamber 6B form a closed space.

That is, the 2nd combustion chamber 2B which is a side which does not perform partial replacement of a brick among the two chambers which comprise the combustion chamber 2 by closing the gas introduction discharge port 7 in the target combustion chamber 2. ) Is kept warm, and the carbonization chamber 1 (vacant room) located at a position adjacent to each other with the second combustion chamber 2B can be kept warm. At this time, heat retention is performed by the heat from the combustion chamber 2 of X64 and X66 which does not perform partial repair.

In fact, when the temperature of the second combustion chamber 2B in the warmed state was measured, during the maintenance work, the furnace length was always 800 ° C. or higher at the center position and 600 ° C. or higher at the end. In the carbonization chambers of # 64 and # 65, the heat transfer amount from the combustion chambers of X64 and X66 is from the door surface, the insulation block 13, and the open-air chamber in the room on the existing brick side on the right side of the numeral 50 in FIG. Since the heat dissipation amount is larger than, the temperature decrease does not occur.

Insulating the vicinity of the boundary between the maintenance part and the non-maintenance part in the carbonization chamber 1 with the heat insulation block 13 makes it possible to more reliably insulate the existing carbonization chamber brick part which does not perform partial repair. It becomes possible. In the said embodiment, although the position of the right end of the replacement range R in FIG. 4 becomes a boundary part of a 1st combustion chamber and a 2nd combustion chamber, it does not need to correspond. For example, this invention is applicable even when the brick of a furnace length center of a 1st combustion chamber side is replaced. This is because the carbonization chamber part of the non-maintenance part on the left side of the heat insulation block 13 is in the heat insulation state as mentioned above.

As apparent from the above description, in the coke oven repairing method according to the first embodiment of the present invention, in the combustion chamber on the brick side where partial replacement is performed, the inter-gas passing portion communicating between the two divided chambers is temporarily blocked. The partial replacement of bricks is performed in a state in which the gas introduction discharge ports in the heat storage chambers communicating with the divided chambers are temporarily blocked. According to this method, since the introduction and discharge of the gas flow in the combustion chamber on the side of the carbonization chamber brick to be subjected to partial replacement are stopped, no chimney draft is generated and the inside of the combustion chamber can be prevented from becoming negative pressure. Moreover, according to this method, since the gas introduction discharge port which communicates between two chambers of a combustion chamber is closed, the chamber of the side which does not perform partial replacement of a brick among the two chambers which comprise a combustion chamber forms a closed space. It becomes heat insulation state, and it becomes possible to heat-insulate the carbonization chamber (vacancy) which is located in the position adjacent to each other and the chamber of the side which does not perform partial replacement. Thereby, partial replacement work of the carbonization chamber brick in hot can be made easy, suppressing the temperature fall of the existing brick which does not perform maintenance.

In the repair method of the coke oven which is one Embodiment of this invention, after arrange | positioning a heat insulating material in the vicinity of the boundary position of the brick which performs partial replacement and the brick which does not perform replacement in the carbonization chamber which is a target of partial replacement, Since partial replacement of bricks is carried out, it is possible to more reliably insulate the existing carbonization chamber brick portion that does not perform partial repairs.

As mentioned above, although embodiment which applied the invention made by this inventor was described, this invention is not limited by the technique and drawing which comprise a part of indication of this invention by this embodiment. For example, other embodiments, examples, operational techniques, and the like made by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

[Industrial Availability]

The present invention can be applied to a method for repairing a coke oven by repairing a coke oven by partially replacing the carbonization chamber brick constituting the furnace wall separating the carbonization chamber and the combustion chamber.

One; Carbonization chamber 2; combustion chamber
2A; First combustion chamber 2B; Second combustion chamber
2a; Vertical year 2b; Top horizontal year
3; Carbonization chamber brick 4; Partition brick
5; Real gas passage 6; Regenerator
6A; First heat storage chamber 6B; 2nd heat storage room
7; Gas inlet outlet 10; 1st occlusion member
10a; Horizontal plate 10b; Shielding plate
10c; Insulation member 11; Insulation
13; Insulating block 14; insulator
15; Protruding member

Claims (3)

Each combustion chamber has a structure divided into two chambers, and has a separate heat storage chamber communicating with each of the chambers, and a coke oven having an inter-gas passage section for allowing gas to flow between the two divided chambers. As a method for repairing a coke oven, which partially replaces and repairs a carbon chamber brick constituting a furnace wall of a carbonization chamber separating a combustion chamber and a carbonization chamber,
In the combustion chamber on the side of the carbonization chamber brick that performs partial replacement, gas introduction in the heat storage chamber communicating with each of the divided chambers is temporarily blocked while temporarily interposing the inter-gas passage portion communicating between the two divided chambers. A partial replacement of the carbonization chamber bricks is performed in a state where the outlets are temporarily blocked, respectively. The method according to claim 1,
After arranging insulation in the vicinity of the boundary position of the brick which performs partial replacement and the brick which does not perform replacement in the carbonization chamber targeted for partial replacement, partial replacement of brick is performed. Repair method. As a repair method of the coke oven which replaces and repairs the carbonization chamber brick which comprises the furnace wall of the carbonization chamber which separates a combustion chamber and a carbonization chamber, hotly,
In the combustion chamber on the side of the carbonization chamber brick which performs the partial replacement, the gas introduction discharge port of the heat storage chamber communicating with the combustion chamber on the side of the carbonization chamber brick that performs partial replacement is vertical. In the state that the communication part of the vertical year which does not perform a year and a change is closed,
And a partial replacement of the carbonization chamber bricks.

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