JP5223875B2 - Coke oven repair method - Google Patents

Description

  The present invention is directed to a coke oven such as a Karlstilt coke oven, and repairs the coke oven by partially transposing the coking chamber brick constituting the furnace wall separating the coking chamber and the combustion chamber. The present invention relates to a method for repairing a coke oven.

In the coke oven, the carbonization chamber and the combustion chamber that supplies heat to the carbonization chamber are alternately arranged in the width direction of the furnace, and the furnace wall of the carbonization chamber that separates the combustion chamber from the combustion chamber (coking chamber brick) Heat is supplied from the combustion chamber to the carbonization chamber via the above. In addition, the combustion chamber is divided at predetermined intervals along the furnace length direction.
Then, the coal charged into the carbonization chamber is heated and co-distilled into coke, and then pushed out from one of the nitrogen ports of the carbonization chamber, but by repeating the operation, the furnace wall undergoes a violent thermal cycle. receive. In addition, once a coke oven starts operation and is brought to a high temperature state, when it is cooled to room temperature, a sudden volume change occurs in the brick. Used. For this reason, the furnace wall bricks should be inspected regularly for damage such as cracks and chippings, and if necessary, repaired by thermal spraying or partial repair of the furnace wall bricks by hot transshipment. Done.

  The partial repair method by hot transshipment is performed by a method as described in Patent Document 1, for example. That is, the operation of the coking chamber that performs hot transshipment is temporarily stopped, and after the heat insulation work is performed while leaving the range for performing the transshipment work, the transshipment work of the furnace wall brick at the repair portion is performed.

Here, the Karl-Styl type coke oven has a basic structure in which each combustion chamber and heat storage chamber are divided into two, and each of the plurality of combustion chambers is divided into two chambers.

JP 2008-169315 A

  In the part where partial transshipment is performed, a temperature drop occurs to the working atmosphere. At this time, in order to protect the existing brick that is not transshipped, it is necessary to heat-retain the existing brick. For this reason, conventionally, the existing brick side to be left without carrying out transshipment ensures the temperature for heat retention by continuing combustion in the furnace.

  However, this is due to the negative pressure in the combustion nitrogen on the existing brick side due to the chimney draft due to the continuation of furnace combustion for heat retention of the existing brick. For this reason, there exists a subject that air suction generate | occur | produces in the joint vicinity of the old and new bricks in the vicinity of the boundary of partial transshipment, and a temperature fall arises in the existing brick. This problem leads to deterioration of the life of existing bricks. For this reason, it is necessary to perform heat insulation work firmly so that there is no gap.

  In addition, due to the continuation of the furnace combustion, the gas cannot be cut twice during the indoor repair work. For this reason, it is necessary for workers working in the room to take sufficient safety measures such as being forced to install air lines.

  This invention pays attention to the above points, and it aims at facilitating the partial trans-loading work of the carbonization chamber brick while hot while suppressing the temperature drop of the existing brick which is not repaired.

In order to solve the above-mentioned problems, the invention described in claim 1 of the present invention has a structure in which each combustion chamber is divided into two chambers and has individual heat storage chambers communicating with the respective chambers. And a coking chamber that constitutes a furnace wall of a coking chamber that separates the combustion chamber and the coking chamber for a coke oven having an inter-chamber gas passage portion that allows gas to pass between the two divided chambers. In the repair method of the coke oven that repairs bricks by partially transshipment in the hot,
In the combustion chamber on the brick side where partial transshipment is performed, gas is introduced into the heat storage chamber that temporarily closes the inter-chamber gas passage portion communicating between the two divided chambers and communicates with each of the divided chambers. A partial transshipment of the brick is performed in a state where the discharge ports are temporarily closed.

  Next, the invention described in claim 2 is insulated from the configuration described in claim 1 in the vicinity of the boundary position between the brick that performs partial transshipment and the brick that does not undergo transshipment in the carbonization chamber to be subjected to partial transshipment. After placing the material, partial transshipment of bricks is performed.

Next, the invention described in claim 3 is a method for repairing a coke oven in which a carbonization chamber brick that constitutes a furnace wall of a carbonization chamber that separates the combustion chamber and the carbonization chamber is repaired by partially transshipping between hot portions. ,
Block the gas inlet / outlet of the heat storage chamber communicating with the combustion chamber on the brick side where partial transshipment is carried out, and in the brick side combustion chamber where partial transshipment is performed, transfer the vertical saddle and the part where the partial transshipment is performed. The bricks are partially transshipped in a state in which a communicating portion with a vertical tunnel not to be used is closed.

According to the present invention, by stopping 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 transshipment, there is no generation of a chimney draft and it is possible to prevent the combustion chamber from becoming negative pressure. .
Moreover, according to the invention which concerns on Claim 1, partial transshipment of the brick of the two chambers which comprise a combustion chamber is obstruct | occluded by obstruct | occluding the gas introduction / exhaust port which connects between the two chambers of the said combustion chamber. The chamber on the non-performing side is kept warm by forming a closed space, and the carbonization chamber (empty nitrogen) at a position adjacent to the chamber on the side where the partial transshipment is not performed can be kept warm.

  At this time, when the invention according to claim 2 is adopted, the insulation between the repaired portion and the non-repaired portion in the carbonization chamber is insulated with a heat insulating block, so that the heat retention of the existing carbonization chamber brick portion where partial repair is not performed is more sure. Can be performed.

It is a typical top view showing a coke oven concerning an embodiment based on the present invention. It is a typical side view which shows the combustion chamber and heat storage chamber which concern on embodiment based on this invention. It is a figure which shows the inter-chamber gas passage part which concerns on embodiment based on this invention. It is a typical top view of the coke oven for demonstrating the partial repair which concerns on embodiment based on this invention. It is a typical side view of a combustion chamber and a heat storage chamber for explaining partial repair concerning an embodiment based on the present invention. It is a figure which shows the example of a 1st obstruction | occlusion member. It is a figure which shows the example of obstruction | occlusion of the chamber gas passage part. It is a figure which shows a heat insulation block. It is a figure which shows the example of arrangement | positioning of a heat insulation block.

Next, embodiments of the present invention will be described with reference to the drawings.
In the present embodiment, a description will be given by taking as an example a Curl still type coke oven as a coke oven. The basic structure of a Karl-Steel type coke oven is that the combustion chamber and the heat storage chamber are both divided into two pieces. That is, air and poor gas are introduced from one of the combustion chamber and the heat storage chamber, and waste gas is discharged from the other chamber of the combustion chamber and the heat storage chamber (see FIG. 2). Combustion is performed while appropriately switching between them. First, the configuration of this furnace will be described.

(Configuration of furnace)
The coke oven of the present embodiment has a structure in which carbonization chambers 1 and combustion chambers 2 are alternately arranged as shown in FIG. 1 which is a schematic plan view. The carbonization chamber 1 is separated from the adjacent combustion chamber 2 by a carbonization chamber brick 3 constituting the furnace wall of the carbonization chamber 1.

  As shown in FIG. 1 and FIG. 2 which is a schematic side view, each combustion chamber 2 is divided into a plurality of vertical canals 2a by partition bricks 4 such as vertical canopy bricks at predetermined intervals along the furnace length direction. Has been. However, the upper parts of the plurality of vertical canals 2a communicate with each other. That is, the upper part of the vertical tunnel 2a communicates with the upper horizontal flue 2b. Furthermore, each combustion chamber 2 is divided into two chambers, a first combustion chamber 2A and a second combustion chamber 2B, in the middle in the longitudinal direction. The upper horizontal flue 2b is divided into two at the boundary position between the first combustion chamber 2A and the second combustion chamber 2B. The first combustion chamber 2 </ b> A and the second combustion chamber 2 </ b> B are in a state of being communicated by one or more inter-chamber gas passage portions 5 having openings as shown in FIG. 3, for example.

  Further, as shown in FIG. 2, individual heat storage chambers 6 are arranged below the respective combustion chambers 2. Each heat storage chamber 6 communicates with the lower portion of each vertical tunnel 2a. The heat storage chamber 6 is also divided into two chambers, a first heat storage chamber 6A and a second heat storage chamber 6B, in the middle of the longitudinal direction corresponding to the two divisions of the combustion chamber 2. The first heat storage chamber 6A and the second heat storage chamber 6B are independent. The first heat storage chamber 6 </ b> A and the second heat storage chamber 6 </ b> B are provided with individual gas introduction / exhaust ports 7 for introducing gas from the outside and discharging gas to the outside, respectively.

(About repair method)
As shown in FIG. 4, the carbonization chamber bricks of the carbonization chamber 1 of # 64 and # 65 are to be repaired, and the first combustion chamber 2A side (the chamber on the left side in FIG. 4) in the carbonization chamber 1 of # 64 and # 65. A description will be given of an example in which some of the carbonization chamber bricks 3 are partially repaired hot.

First, repair preparation work is performed.
First, the X65 combustion chamber 2 located between the # 64 and # 65 carbonization chambers 1, that is, the X65 combustion chamber 2X65 on the brick side to be partially repaired, and the heat storage chamber 6 communicating with the X65 combustion chamber 2 are targeted. The blocking process is performed.

  That is, as shown in FIG. 5, each gas inlet / outlet port 7 individually communicating with the first heat storage chamber 6 </ b> A and the second heat storage chamber 6 </ b> B constituting the heat storage chamber 6 is closed with the first closing member 10. .

  The first closing member 10 has the following structure, for example. That is, as shown in FIG. 6, the shield plate 10b rises from the horizontal plate 10a and the elastic heat insulating member 10c covers the periphery of the shield plate 10b. The said shielding board 10b is comprised from a steel plate, for example. The heat insulating member 10c is made of, for example, ceramic wool, and is attached to the entire periphery of the shielding plate 10b by winding the ceramic wool around the shielding plate 10b. The shielding plate 10 b is formed in a shape slightly smaller than the cross-sectional shape of the inlet of the gas introduction / exhaust port 7 and can be inserted into the inlet of the gas introduction / exhaust port 7. However, since the periphery of the shielding plate 10b is covered with the heat insulating member 10c, a gap is sealed between the gas introduction / discharge port 7 and the shielding plate 10b by the heat insulating member 10c. That is, the heat insulating member 10c also serves as a sealing member. However, the first closing member 10 is not limited to the above configuration, and can be used as the first closing member 10 as long as it has a structure capable of sealing and sealing the gas inlet / outlet 7.

Further, the inter-chamber gas passage portion 5 that communicates the first combustion chamber 2A and the second combustion chamber 2B in the X65 combustion chamber 2 is also closed by the second closing member. As the second closing member, for example, a ceramic wool 11 wound in a roll shape may be used. As shown in FIG. 7, the inter-chamber gas passage 5 can be closed by the elasticity of the ceramic wool 11 by inserting the ceramic wool 11 wound in a roll shape into the inter-chamber gas passage 5.
Further, as shown in FIG. 5, the heat insulating member 12 made of ceramic wool or the like is also used for the upper horizontal flue 2b located at the boundary between the brick to be transshipped and the brick not to be transshipped in the first combustion chamber 2A on the repair side. Block with.

  Further, in the carbonization chamber 1 of # 64 and # 65, a heat insulation block is inserted from the door side (left side in FIG. 4) of the carbonization chamber 1 on the repair side to the position of reference numeral 50, and the carbonization chamber brick 3 to be partially repaired. The said heat insulation block is piled up in the non-repair side position rather than the boundary position of the non-repair carbonization chamber brick 3. FIG. As a result, the boundary between the repair side and the non-repair side is shut off in a heat insulating state by the heat insulating block. Here, the heat insulation block may be charged into the room by using a transport carriage as described in, for example, Japanese Patent Application Laid-Open No. 2009-286835.

  For example, as shown in FIG. 8, the heat insulating block 13 is formed by compressing a plate-like or block-like ceramic wool 13 a into a compressed state and restraining the compressed state with a band 13 b. And, as shown in FIG. 9, the ceramic wool in the compressed state returns to its original size with its own restoring force by removing the band after disposing the heat insulating block 13 at the above-mentioned position in the carbonization chamber 1, The carbonization chamber 1 is closed so as to be temporarily divided into two chambers.

  After the clogging treatment, the heat insulating material 14 is applied and cured along the non-repair side carbonization chamber bricks (the bricks on the combustion chamber 2 side of X64 and X66) in the target carbonization chamber 1 to thereby cure the X64. And the heat insulation of the brick on the combustion chamber 2 side of X66 is ensured.

  Further, as shown in FIG. 9, a protrusion prevention member 15 is provided in the vicinity of the boundary position between the partially repaired carbonization chamber brick 3 and the non-repair carbonization chamber brick 3, which is the front side (repair side) of the stacked heat insulation block 13. Deploy. The urge prevention member 15 spans between the facing furnace walls of the coking chamber 1 to prevent the coking chamber brick 3 from being pushed out toward the coking chamber 1 side. The protrusion prevention member of this embodiment is realized by arranging a support brick as shown in FIG.

As for the arrangement of the support bricks, for example, two parallel bricks are arranged side by side so as to be bridged between the facing furnace walls. A set of the two parallel bricks is arranged at predetermined intervals in the vertical direction. In addition, a pillar brick whose longitudinal direction is directed up and down is arranged so as to hold and support the upper and lower parallel bricks, and the height position is maintained.
The above-mentioned parallel brick is processed in accordance with the dimensions of the carbonization chamber 1. Further, in the installation before the temperature rise, a slight allowance is provided to allow the coking chamber brick 3 to be allowed to protrude slightly. That is, it should not be over-constrained.

Here, the support brick may be installed before the brick is demolished and used to prevent the brick wall from protruding due to a temperature drop during the brick demolishing.
In addition, what is necessary is just to implement the obstruction | occlusion of the said inter-chamber gas passage part 5 after installation of the said heat insulation block 13. FIG.
In this state, the bricks are transshipped for the carbonization chamber brick 3 to be partially repaired and the partition brick 4 positioned between the carbonization chamber bricks 3.

Then, after releasing the closing member from the gas inlet / outlet 7 and the inter-chamber gas passage portion 5, the furnace is raised to a brick transformation point (for example, 600 ° C.) or higher with the support brick as an extrusion preventing member installed. Warm up.
When the temperature is raised to the target temperature, the support brick is broken by inserting and pushing and pulling a long rod-shaped jig from the nitrogen entrance, and the heat insulating material such as the support brick and the heat insulating block is removed.

  Further, the joint portion is filled by spraying a spraying material on the joint portion between the non-repair portion and the repair portion. At this time, it is ideal that the expansion is absorbed and there is no protrusion, but in reality, there is a deformation that slightly protrudes around the boundary. The main reason seems to be that the expansion characteristics of the existing brick and the new brick are different. For this reason, the above-mentioned thermal spraying is performed not only on the boundary portion but also on the portion where the bulging deformation has occurred.

Next, the deformed portion that has come out toward the carbonizing chamber 1 is cut and shaped by a polishing apparatus such as sandblast.
After that, it resumes operation as a furnace.

(Function and effect)
In this embodiment, the existing brick part which does not transship by stopping introduction and discharge | emission of the gas flow in the combustion chamber 2 in which a part of furnace wall is formed in the carbonization chamber brick 3 used as the object of partial transshipment This prevents the combustion chamber 2 from becoming negative pressure.
At this time, the second heat storage chamber 6B on the non-repair side and the first combustion chamber 1B communicating with the second heat storage chamber 6B form a closed space.

  That is, by closing the gas inlet / outlet 7 in the target combustion chamber 2, the second combustion chamber 2 </ b> B on the side where the partial brick transshipment is not performed among the two chambers constituting the combustion chamber 2 is kept warm. It becomes a state, and it becomes possible to keep warm the carbonization chamber 1 (air-nitrogen) in a position adjacent to the second combustion chamber 2B on the side where the partial transshipment is not performed. At this time, heat insulation is performed by heat from the combustion chambers 2X64 and X66 where partial repair is not performed.

Here, when actually measuring the temperature of the second combustion chamber 2B in the heat-retaining state, during the repair work, the temperature is always 800 ° C. or higher at the center of the furnace length, and 600 ° C. or higher is secured even at the end. I confirmed that it was done.
Also, in the # 64 and # 65 carbonization chambers, the heat transfer from the combustion chambers X64 and X66, the door surface, the heat insulation block 13, the furnace in the existing brick side chamber to the right of the reference numeral 50 in FIG. Considering the thermal balance with the heat radiation from the ceiling, there is no temperature drop due to the following relationship.
(Heat transfer from X64, X66 combustion chamber)
>> (Heat radiation from door surface, heat insulation block 13, furnace ceiling)

Further, by insulating the vicinity of the boundary between the repaired portion and the non-repaired portion in the carbonizing chamber 1 with the heat insulating block 13, it becomes possible to more reliably retain the heat of the existing carbonized chamber brick portion where partial repair is not performed. .
In the above embodiment, the right end position of the transshipment range in FIG. 4 is the boundary between the first combustion nitrogen and the second combustion chamber, but it is not necessary to match. For example, the present invention is applicable even when a brick at the center of the furnace length on the first combustion chamber side is transshipped.
This is because the carbonization chamber portion of the non-repaired portion on the left side of the heat insulating block 13 is in a heat insulating state as described above.

DESCRIPTION OF SYMBOLS 1 Carbonization chamber 2 Combustion chamber 2A 1st combustion chamber 2B 2nd combustion chamber 2a Vertical side flue 2b Upper horizontal flue 3 Carbonization chamber brick 4 Partition brick 5 Intercompartment gas passage 6 Thermal storage chamber 6A 1st thermal storage chamber 6B 2nd thermal storage Chamber 7 Gas inlet / outlet port 10 First closing member 10a Horizontal plate 10b Shield plate 10c Thermal insulation member 11 Thermal insulation member 13 Thermal insulation block 14 Thermal insulation material 15 Protrusion prevention member

Claims (3)

Each combustion chamber has a structure that is divided into two chambers, has an individual heat storage chamber that communicates with each of the chambers, and allows the passage of gas between the two divided chambers. In a coke oven repair method for repairing a carbonization chamber brick that constitutes a furnace wall of a carbonization chamber that separates the combustion chamber and the carbonization chamber for a coke oven having a gas passage part, by partially transshipping between the heat,
In the combustion chamber on the brick side where partial transshipment is performed, gas is introduced into the heat storage chamber that temporarily closes the inter-chamber gas passage portion communicating between the two divided chambers and communicates with each of the divided chambers. A method for repairing a coke oven, wherein partial replacement of the brick is performed in a state where the discharge ports are temporarily closed.   In the carbonization chamber to be subjected to partial transshipment, a heat insulating material is arranged in the vicinity of a boundary position between a brick that undergoes partial transshipment and a brick that does not undergo transshipment, and then partial transshipment of brick is performed. Coke oven repair method described. In the repair method of the coke oven, in which the carbonization chamber brick constituting the furnace wall of the carbonization chamber that separates the combustion chamber and the carbonization chamber is repaired by partially transshipment in the heat,
Block the gas inlet / outlet of the heat storage chamber communicating with the combustion chamber on the brick side where partial transshipment is carried out, and in the brick side combustion chamber where partial transshipment is performed, transfer the vertical saddle and the part where the partial transshipment is performed. In a state where the communication part with the vertical tunnel not to be closed,
A method of repairing a coke oven, wherein partial replacement of the brick is performed.

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