TWI452126B - Method of repairing coke furnace - Google Patents

Description

Coke oven repair method

The invention relates to a method for repairing a coke oven, wherein the method for repairing the coke oven is to partially replace the carbonization chamber bricks constituting the furnace wall separating the carbonization chamber from the combustion chamber by using heat, thereby The coke oven is repaired.

The coke oven is configured by alternately arranging a carbonization chamber and a combustion chamber that supplies heat to the carbonization chamber in the furnace width direction. In the coke oven, heat is supplied from the combustion chamber to the carbonization chamber via a furnace wall (carbonization chamber brick) of the carbonization chamber that separates the carbonization chamber from the combustion chamber. The coal charged into the carbonization chamber is heated by the heat supplied from the combustion chamber, thereby being dry-distilled into coke, and the generated coke is extruded from a kiln opening of the carbonization chamber.

The carbonization chamber bricks are subjected to intense thermal cycling due to repeated operations. When the coke oven is cooled to a normal temperature, the carbonization chamber bricks are suddenly reduced in volume. Therefore, once the operation is started and the high temperature state is reached, the carbonization chamber bricks are continuously used until the life is exhausted. Therefore, in the coke oven, it is checked whether there is damage such as cracks or corners in the carbonization chamber brick, and if necessary, the following operations are performed, that is, repair by spraying, or partial carbonization by heat pile replacement. The room bricks are repaired.

The repairing operation for partially repairing the carbonization chamber brick by the heat pile is carried out, for example, by the method disclosed in Patent Document 1. In this method, the operation of the carbonization chamber in which the heat stacking is performed is temporarily stopped, and the carbonization chamber brick is subjected to the heat insulating construction while the range of the stacking operation is retained, and then the stacking operation of the carbonized chamber brick for the repaired portion is performed.

[Advanced technical literature]

[Patent Literature]

[Patent Document 1]: Japanese Patent Laid-Open Publication No. 2008-169315

According to the above method, the temperature of the portion where the partial stacking is performed is lowered to the working environment. At this time, in order to protect the carbonized room bricks (original bricks) that are not to be stacked, the original bricks must be kept warm. Therefore, in the above method, the furnace on the original brick side is continuously burned, thereby ensuring the temperature for maintaining heat.

However, when the original brick side furnace continues to burn, due to the chimney draft, the original brick side combustion chamber becomes a negative pressure. Therefore, air suction occurs in the vicinity of the joint of the new and old bricks near the boundary of the partial stacking, and the temperature of the original brick is lowered. This drop in temperature causes the life of the original brick to deteriorate. Therefore, in the above method, it is necessary to perform the heat insulation construction firmly to eliminate the gap.

Moreover, in the case where the furnace on the original brick side continues to burn, when the repair work is performed indoors, the gas cannot be double blocked. Therefore, in the above method, the operator who performs the work indoors has to equip the air line, and it is also necessary to take safety measures sufficiently.

The present invention has been made in view of the above-described aspects, and an object of the present invention is to provide a method for repairing a coke oven which can suppress a temperature drop of an existing brick which is not repaired, and can be easily performed. The heat is used to partially replace the carbonization chamber bricks.

The present invention relates to a method for repairing a coke oven, in which a coke oven is used as a target, and heat is used to partially replace and repair a carbonization chamber brick constituting a furnace wall of a carbonization chamber that separates a combustion chamber from a carbonization chamber. Each combustion chamber of the coke oven is configured to be divided into two chambers, and the coke oven includes individual regenerators connected to the respective chambers, and includes inter-chambers that allow gas to pass between the divided two chambers. The gas passage portion temporarily closes the inter-chamber gas passage portion that communicates between the divided two chambers in the combustion chamber on the side of the brick that is partially replaced, and temporarily connects to the divided portion. The gas introduction and discharge ports in the regenerators of the respective chambers are closed, and in this state, the bricks are partially replaced.

The invention relates to a method for repairing a coke oven, which uses heat to partially replace and repair a carbonization chamber brick constituting a furnace wall of a carbonization chamber separating a combustion chamber from a carbonization chamber, and is connected to perform partial replacement. The gas introduction discharge port of the regenerator of the combustion chamber on the brick side is closed, and in the combustion chamber on the brick side where the partial replacement is performed, the vertical flame path of the partially-replaced portion is not replaced. The communication portion of the vertical flame path is closed, and in this state, the brick is partially replaced.

According to the present invention, it is possible to suppress the temperature drop of the existing brick which is not repaired, and it is possible to easily carry out the work of partially stacking the carbonization chamber brick by heat.

Next, an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, a charcoal stove is described by taking a Carl Still type coke oven as an example. The combustion chamber and regenerator of the Steyr-type coke oven are two-part vertical fire tunnel construction. That is, the Steyr-type coke oven is subjected to combustion by alternately switching the following processes, and the process is to introduce air and lean gas from a chamber in the combustion chamber and the regenerator, and self-combustion. The chamber and the other chamber in the regenerator discharge the exhaust gas.

Composition of the furnace

As shown in Fig. 1, the coke oven 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 separated from the adjacent combustion chamber 2 by the carbonization chamber brick 3 constituting the furnace wall of the carbonization chamber 1.

As shown in FIG. 1 and FIG. 2, each of the combustion chambers 2 is divided into a plurality of vertical flame passages 2a at predetermined intervals along the length of the furnace by spacer bricks 4 such as vertical flame duct bricks. The upper portions of the plurality of vertical flame paths 2a are in communication. That is, the upper portion of the vertical flame path 2a is communicated by the upper horizontal flue 2b. Each of the combustion chambers 2 is divided into two chambers, a first combustion chamber 2A and a second combustion chamber 2B, at a midway position 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 2A and the second combustion chamber 2B are in a state of being communicated by one or two or more inter-chamber gas passage portions 5 constituted by openings as shown in FIG. 3 .

As shown in FIG. 2, an individual regenerator 6 is disposed below each combustion chamber 2. Each of the regenerators 6 is in communication with a lower portion of each of the vertical flame passages 2a. The regenerator 6 corresponds to the structure in which the combustion chamber 2 is divided into two, and is divided into the first chambers of the first regenerator 6A and the second regenerator 6B at the intermediate position in the longitudinal direction. The first regenerator 6A is independent of the second regenerator 6B. In the first regenerator 6A and the second regenerator 6B, separate gas introduction and discharge ports for introducing gas from the outside and discharging the gas to the outside are provided. 7.

Repair method

As shown in FIG. 4, the carbonization chamber 1 of the carbonization chamber 1 of #64 and #65 is used as a repair target, and the carbonization chamber 1 of #64 and #65 is heated by heat. The carbonization chamber brick 3 (the stacking range R shown in FIG. 4) located on the first combustion chamber 2A side (the chamber on the left side in FIG. 4) is partially repaired.

For this repair method, first, the operator performs a repair preparation work. Specifically, the operator sets the combustion chamber 2 of X65 between the carbonization chambers 1 of #64 and #65, that is, the combustion chamber 2 of the X65 which is partially repaired, and the regenerator of the combustion chamber 2 that communicates with X65. 6 is occluded as an object. In other words, as shown in FIG. 5, the operator closes the respective gas introduction discharge ports 7 that are individually communicated with the first heat storage chamber 6A and the second heat storage chamber 6B that constitute the heat storage chamber 6 by the first closing member 10.

The first occluding member 10 has a configuration as shown in FIG. 6. That is, as shown in FIG. 6, the first closing member 10 includes a shielding plate 10b that is erected on the horizontal plate 10a, and a heat insulating member 10c that covers the periphery of the shielding plate 10b and has elasticity. The shielding plate 10b is composed of, for example, a steel plate. The heat insulating member 10c is made of, for example, ceramic wool, and the ceramic wool is wound around the shielding plate 10b, whereby the heat insulating member 10c is attached to the entire outer periphery of 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 introduction discharge port 7, and can be inserted into the inlet of the gas introduction discharge port 7. Since the periphery of the shield plate 10b is covered by the heat insulating member 10c, the gap between the gas introduction discharge port 7 and the shield plate 10b is sealed by the heat insulating member 10c. That is, the heat insulating member 10c serves as a sealing member. The first closing member 10 is not limited to the above-described configuration, and may be used as the first closing member 10 as long as it is a member that can seal the gas introduction discharge port 7 .

Next, the operator closes the inter-chamber gas passage portion 5 by the second closing member, and the inter-chamber gas passage portion 5 communicates the first combustion chamber 2A and the second combustion chamber 2B in the combustion chamber 2 of X65. For example, a member in which the ceramic wool 11 is wound into a roll shape may be used as the second closing member. As shown in Fig. 7, the ceramic wool 11 wound in a roll shape is inserted into the inter-chamber gas passage portion 5, whereby the inter-chamber gas passage portion 5 can be closed by the elastic force of the ceramic wool 11. As shown in Fig. 5, the upper horizontal flue 2b is closed in advance by a heat insulating member 12 made of ceramic wool or the like, and the upper horizontal flue 2b is placed in the first combustion chamber 2A on the repair side for stacking. The boundary between bricks and bricks that are not stacked.

Next, as shown in FIG. 4, the operator puts the heat insulating block from the damper side (the left side in FIG. 4) of the carbonization chamber 1 on the repair side to the position of the symbol 50 in the carbonization chamber 1 of #64 and #65, The heat insulating block is stacked to a position closer to the non-repair side than the boundary position between the carbonized chamber brick 3 and the unrepaired carbonization chamber brick 3 which are partially repaired. Thereby, the boundary between the repaired side and the unpatched side can be blocked by the heat insulating block in the heat insulating state. When the heat insulating block is placed in the room, it may be carried out by using a transfer trolley, for example, as disclosed in Japanese Laid-Open Patent Publication No. 2009-286835.

As shown in Fig. 8, the heat insulating block 13 is a ceramic wool which is restrained by bending a plate-like or block-shaped ceramic wool 13a to a compressed state by means of a band 13b. As shown in Fig. 9, after the heat insulating block 13 is placed at the above position in the carbonization chamber 1, the strip 13b is removed, whereby the ceramic wool in a compressed state can be restored to its original size by its own restoring force. The clogging is performed in such a manner that the inside of the carbonization chamber 1 is temporarily divided into two chambers.

Then, after the occlusion process, the operator constructs the heat insulating material 14 along the unrepaired side carbonization chamber bricks (the bricks on the combustion chamber 2 side of X64 and X66) in the carbonization chamber 1 to be targeted as shown in FIG. It is also protected to ensure the insulation of the bricks on the side of the combustion chamber 2 of the X64 and X66.

Next, as shown in FIG. 9, the worker arranges the anti-projection member 15 in the vicinity of the boundary position of the carbonization chamber brick 3 which is partially repaired, which is the front side (repair side) of the stacked heat insulating block 13, and the carbonization chamber brick 3 which is not repaired. . The anti-protrusion member 15 is placed between the opposing furnace walls of the carbonization chamber 1 to prevent the carbonization chamber bricks 3 from protruding toward the carbonization chamber 1 side. The anti-projection member 15 of the present embodiment is realized by arranging the support bricks.

The support bricks are placed between the opposing furnace walls, for example by laterally arranging two side-by-side bricks to form the support bricks. The operator arranges the combination of the two side-by-side bricks in the vertical direction at regular intervals. The worker arranges the pillar bricks facing the upper and lower sides in the longitudinal direction and maintains the height position so as to maintain the interval between the upper and lower side-by-side bricks. The operator preliminarily cooperates with the size of the carbonization chamber 1 to process the side-by-side bricks. When the supporting brick is disposed before the temperature rise, the operator has a margin between the supporting brick and the furnace wall in advance, thereby achieving a state in which the carbonization chamber brick 3 is allowed to slightly protrude. That is, the operator preliminarily causes the supporting bricks to not excessively restrain the carbonization chamber bricks 3.

The operator can also set a support brick before the brick disintegrates, and use the support brick to prevent the brick wall from protruding due to the temperature drop when the brick is disassembled. After the heat insulating block 13 is provided, the inter-chamber gas passage portion 5 may be closed. In the above state, the operator exchanges the partially-repaired carbonization chamber brick 3 and the partition brick 4 located between the carbonization chamber bricks 3.

Then, after the operator releases the closing member from the gas introduction discharge port 7 and the inter-chamber gas passage portion 5, the furnace is heated to the abnormal point of the brick in a state where the support brick as the protrusion preventing member 15 is provided (for example) 600 ° C) or more. After the temperature rises to the target temperature, the operator inserts a long rod-shaped jig from the kiln opening, and then pushes and pulls it to pulverize the supporting brick to heat the insulating material such as the supporting brick or the insulating block. Removal.

Next, the operator applies a spray coating of the sprayed spray material to the joint of the portion of the portion where the repaired portion and the repaired portion are not repaired, thereby filling the joint portion. At this time, it is desirable that it does not swell and absorb and protrude. However, actually, there is a deformation that is slightly protruded around the boundary portion. The main reason for the above situation is generally considered to be that the expansion characteristics of existing bricks and new bricks are different. Therefore, in addition to spraying the boundary portion, the operator also sprays the portion where the protruding deformation occurs.

Finally, the operator cuts the deformed portion that protrudes toward the carbonization chamber 1 side by a grinding device such as a sand blasting machine to perform shaping. The operator then restarts the furnace.

In the method for repairing a coke oven according to the present embodiment, the worker stops the introduction of the airflow to the carbonization chamber brick 3 which is the target of the partial stacking. The combustion chamber 2 of the original brick portion which is not subjected to stacking is prevented from becoming a negative pressure in the combustion chamber 2 of a part of the furnace wall and by stopping the discharge of the above airflow. At this time, the second regenerator 6B on the side where the repair is not performed and the second combustion chamber 2B that communicates with the second regenerator 6B form a closed space.

In other words, the gas introduction/discharge port 7 in the combustion chamber 2 to be the target is closed, whereby the second combustion chamber 2B, which is a side that does not partially replace the brick among the two chambers constituting the combustion chamber 2, is insulated. In a state, the carbonization chamber 1 (empty chamber) located at a position adjacent to the second combustion chamber 2B can be kept warm. At this time, heat retention is performed by heat from the combustion chamber 2 of X64 and X66 which are not partially repaired.

Actually, after the temperature of the second combustion chamber 2B in the heat-insulated state is measured, the center portion of the furnace length is always 800 ° C or more during the repairing operation, and the end portion can also ensure a temperature of 600 ° C or higher. In the carbonization chambers of #64 and #65, in the indoor brick side of the right side of the symbol 50 in Fig. 4, the heat conduction amount of the combustion chambers from X64 and X66 is higher than that of the self-winding facade and the heat insulating block 13, And the top plate releases more heat, so the temperature does not drop.

The heat insulating block 13 is used to insulate the vicinity of the boundary between the repaired portion and the unrepaired portion in the carbonization chamber 1, whereby the original carbonized chamber brick portion which is not partially repaired can be more reliably insulated. In the above embodiment, the right end position of the stacking range R in Fig. 4 serves as a boundary portion between the first combustion chamber and the second combustion chamber, but it is not necessary to match. For example, the present invention can be applied even when the bricks at the center of the furnace length on the first combustion chamber side are stacked. The reason is that, as described above, the portion of the carbonization chamber which is not repaired on the left side of the heat insulating block 13 is kept warm.

The above description shows that in the repairing method of the coke oven according to the embodiment of the present invention, in the combustion chamber on the side of the brick which is partially replaced, the inter-chamber that connects the divided two chambers is temporarily provided. The gas passage portion is closed, and the gas in the regenerator connected to each of the divided chambers is temporarily blocked from being introduced into the discharge port, and in this state, the brick is partially replaced. According to the above method, since the introduction and discharge of the airflow in the combustion chamber on the side of the carbonization chamber brick, which is the target of the partial stacking, are stopped, the chimney is not pulled out, and the inside of the combustion chamber can be prevented from becoming a negative pressure. Further, according to the above method, since the gas introduction discharge port that communicates between the two chambers of the combustion chamber is closed, the chamber on the side where the brick is not partially replaced among the two chambers constituting the combustion chamber is closed. The space is thereby brought to a state of heat retention so that the carbonization chamber (empty chamber) at a position adjacent to the chamber on the side where the partial stacking is not performed is maintained. Thereby, it is possible to suppress the temperature drop of the existing brick which is not repaired, and it is possible to easily carry out the work of partially stacking the carbonization chamber brick by heat.

In the method for repairing a coke oven according to an embodiment of the present invention, the heat insulating material is disposed in the vicinity of a boundary position between the partially-replaced brick and the non-stacked brick in the carbonization chamber to be partially replaced. The bricks are then partially replaced so that the original carbonized chamber bricks that are not partially repaired can be more reliably insulated.

The embodiment of the invention obtained by the inventors of the present invention has been described above, but the description and the drawings which constitute a part of the present invention are not limited to the present invention. For example, other embodiments, examples, and operational techniques obtained by those skilled in the art based on the present embodiment are all included in the scope of the present invention.

The present invention is applicable to a method for repairing a coke oven in which a carbonization chamber brick constituting a furnace wall that separates a carbonization chamber from a combustion chamber is partially replaced by heat, thereby Coke oven for repair.

1. . . Carbonization room

2. . . Combustion chamber

2A‧‧‧1st combustion chamber

2B‧‧‧2nd combustion chamber

2a‧‧‧Vertical flame path

2b‧‧‧ upper horizontal flue

3‧‧‧Carbonization brick

4‧‧‧interval brick

5‧‧‧Interventricular gas passage

6‧‧‧ Thermal storage room

6A‧‧‧1st regenerator

6B‧‧‧2nd regenerator

7‧‧‧Gas introduction and discharge

10‧‧‧1st occlusion component

10a‧‧‧ horizontal board

10b‧‧‧shading board

10c, 12‧‧‧heat insulation components

11‧‧‧Ceramic cotton

13‧‧‧Insulation block

13a‧‧‧Ceramic cotton

13b‧‧‧ strips

14‧‧‧Insulation materials

15‧‧‧Anti-protrusion members

50‧‧‧ symbol

R‧‧‧Stacking range

#63,#64,#65,#66,#67,X63,X64,X65,X66, X67‧‧‧ number

Fig. 1 is a plan view showing a configuration of a coke oven which is one embodiment of the present invention.

Fig. 2 is a side view showing a configuration of a combustion chamber and a heat storage chamber according to an embodiment of the present invention.

Fig. 3 is a view showing a configuration of an inter-chamber gas passage portion according to an embodiment of the present invention.

Fig. 4 is a plan view showing a coke oven for explaining a partial repairing method according to an embodiment of the present invention.

Fig. 5 is a side view of a combustion chamber and a regenerator for explaining a partial repairing method according to an embodiment of the present invention.

FIG. 6 is a view showing a configuration example of a first closing member.

Fig. 7 is a view showing an example of occlusion of an inter-chamber gas passage portion.

8 is a view showing an example of the configuration of a heat insulating block.

Fig. 9 is a view showing an arrangement example of a heat insulating block.

1. . . Carbonization room

2. . . Combustion chamber

2a. . . Vertical flame path

3. . . Carbonization chamber brick

4. . . Interval brick

#63, #64, #65, #66, #67, X63, X64, X65, X66, X67. . . Numbering

Claims (3)

A method for repairing a coke oven, in which a coke oven is used as a target, and heat is used to partially replace and repair a carbonization chamber brick constituting a furnace wall of the carbonization chamber that separates a combustion chamber from a carbonization chamber, the coke oven Each of the above combustion chambers is configured to be divided into two chambers, and the coke oven includes individual regenerators connected to the respective chambers, and includes inter-chamber gas that allows gas to pass between the divided two chambers. In the passing portion, the method for repairing the coke oven is characterized in that the inter-chamber gas that communicates between the divided two chambers is temporarily temporarily placed in the combustion chamber on the side of the carbonization chamber brick that is partially replaced. The passage portion is closed, and the gas introduction passages in the regenerators that are connected to the divided chambers are temporarily closed, and the carbonization chamber bricks are partially replaced in the above state. The method for repairing a coke oven according to the first aspect of the invention, wherein the heat insulating material is disposed in the carbonization chamber brick partially exchanged in the carbonization chamber which is a part of the partial replacement, and the above-mentioned non-replacement After the carbonization chamber bricks are near the boundary position, the carbonization chamber bricks are partially replaced. A method for repairing a coke oven, wherein heat is used to partially replace and repair a carbonization chamber brick constituting a furnace wall of the carbonization chamber that separates a combustion chamber from a carbonization chamber, and the repair method of the coke oven is characterized in that : a gas introduction discharge port that communicates with the regenerator of the combustion chamber on the side of the carbonization chamber brick that is partially stacked, and is closed, and a part of the combustion chamber on the side of the carbonization chamber brick that is partially replaced Stacked The communication portion between the partial vertical flame passage and the vertical flame passage that is not stacked is closed, and in the above state, the carbonization chamber brick is partially replaced.