JP6720005B2 - Coke oven dismantling method - Google Patents

Description

The present invention relates to a method for dismantling a coke oven in which carbonization chambers and combustion chambers are alternately arranged in the furnace group direction.

FIG. 1 is a schematic view of a coke oven (for example, Patent Document 1). As shown in FIG. 1, in the coke oven, a thin carbonization chamber 2 and a combustion chamber 3 are alternately arranged on the heat storage chamber 1 so as to lean toward the furnace group. Coal stored in the coal tank 4 is charged into the carbonization chamber 2 from a coal car 6 running on a track 5 arranged on the top of the coke oven. The coal charged into the carbonization chamber 2 from the coal car 6 is carbonized by heating the carbonization chamber 2 by the heat generated in the combustion chamber 3 to form coke. When coking is completed in the carbonization chamber 2, the furnace lids installed at the kiln openings on both sides of the carbonization chamber 2 in the furnace length direction are opened, and the coke in the carbonization chamber 2 is pushed by the extruder 7 to the pusher side PS (extruder side). From the kiln opening to the coke side CS (guide car side) kiln opening and discharge.

The coke pushed out to the kiln mouth of the coke side CS of the carbonization chamber 2 is discharged to the coke receiving carriage 9 via the guide vehicle 8, and the coke (red hot coke) discharged to the coke receiving carriage 9 is a cooling facility. , For example, it is transported to a CDQ (coke dry fire extinguishing equipment) not shown. The guide wheel 8 travels on a track (not shown) provided on the platform 10 and moves to a predetermined kiln of the carbonization chamber 2 where coke is extruded.

FIG. 2 is a plan view showing a part of the carbonization chambers 2 and the combustion chambers 3 which are alternately arranged in the furnace group direction. The brick wall 12 forming each combustion chamber 3 has a PS backstay 14 which is a pillar standing upright on the PS side and a CS backstay 15 which is a pillar standing upright on the coke side CS side. It is supported via a protective plate 13b which is a furnace metal piece. Around the protective plate 13b, another furnace metal piece 13 such as the furnace frame 13a is arranged to reinforce the periphery of the furnace lid 11.
Specifically, the furnace metalwork 13 includes a furnace frame 13a, a protective plate 13b, and the like. In addition, it is composed of a door frame that forms the kiln mouth of the carbonization chamber 2 (the kiln mouth of the pusher side PS, the kiln mouth of the coke side CS), the tension ledge that holds down the brick wall 12, the flush plate, the head plate, and the like. There is.

By the way, when the coke oven is operated for more than 20 to 30 years to carry out dry distillation and discharge repeatedly, the brick wall 12 forming the combustion chamber 3 is worn and deteriorated. Therefore, renewal work is performed in which the deteriorated brick wall 12 and the backstays 14 and 15 are removed, a new brick wall 12 is formed, and a new backstay is erected.

When disassembling the coke oven, as described in Patent Document 1, one of the openings such as the kiln mouth of the carbonization chamber is closed with a protective wall, and the brick wall is disassembled from the opposite side with a dismantling machine, and the closed side is closed. A technique of advancing dismantling is known (if disassembling from the PS side, the opening on the CS side is closed with a protective wall, and if disassembling from the CS side, closing the opening on the PS side with a protective wall). In this technology, the protection wall is fixed to the backstay, and after making cuts (weaknesses) in all the backstay lower parts connected through the protection wall, it is said that the backstay can be efficiently disassembled by applying an external force. .. Further, in Patent Document 1, since the kiln opening on the CS side is conventionally opened by the door frame of the furnace body hardware 13, the brick waste of the brick wall 12 dismantled by the dismantling construction machine is platformed from the kiln opening on the CS side. It is stated that it may fall to the side. Therefore, it is described that the opening on the CS side (CS kiln opening) is closed by a protective wall during dismantling to prevent bricks from falling and scattering. Hereinafter, of the PS side and the CS side, the side on which the dismantling machine is installed will be referred to as the dismantling side, and the side remaining until the end will be referred to as the opposite side.

FIG. 9 shows an overall flow of a conventional concrete disassembly.
Stop the coke oven. At this time, coke, coal kiln removal and gas stopping are performed.
Gas purging is performed for 3 days.
Remove the furnace lid on the PS side using an extruder for 5 days.
Remove the furnace lid on the CS side using a guide car over 5 days.
Over 17 days, the off-take men and dry men, which are ducts for collecting and discharging after cooling the exhaust gas generated during the carbonization of coal, are removed.
Over 2 days, the opening of the kiln on the CS side is closed with a wire net.
Loosen the cross tie rod over 5 days.
Make precuts (weaknesses) in the PS backstay over 2 days.
Brick dismantling (including PS kiln metal fittings, CS protection plate, furnace frame, furnace lid removal, up to PF level) will be done over 9.5 days. The term "up to the PF level" here means that the brick is dismantled to the height of the PF (platform).

In any case, before dismantling the coke oven, it is always indispensable to remove the furnace lid, which is the opening of the furnace, to prepare for dismantling. Then, in order to prevent scattering of falling objects such as bricks, the opening with the furnace lid removed is closed by installing a temporary lid or a protective wall. As described above, the reason why the furnace lid is removed before the brick dismantling is considered as follows, although the furnace opening needs to be closed again when the furnace dismantling operation is started. That is, since the inside of the coke oven immediately after the pause is about 1000° C., the oven lid is opened by removing the oven lids on both the PS side and the CS side, and the coke oven is cooled rapidly.

JP, 2015-13937, A

When removing the furnace lid to open the opening of the kiln before the brick is dismantled, there is a risk of brick collapse around the furnace lid. In particular, on the CS side, when the coal that has been subjected to carbonization is extruded from the PS side as coke and discharged to the CS side, the coke compressed by the extruder catches the coal near the CS side outlet, removing bricks near the CS side kiln. Since the force that pushes it toward the furnace group is repeatedly applied (see Fig. 8), the damage to the surrounding bricks is great. As a result, the boundaries of bricks are being cut off and the bricks are becoming smaller. Further, as shown in FIG. 2, the back stays 14 and 15 facing each other on the PS side and the CS side are connected by a steel bar called a cross tie rod at the upper part of the furnace or the like. At the joint between the cross tie rod and the back stay, a compression force (furnace tightening force) is applied to the center of the furnace by a spring, but when the furnace is stopped, the brick shrinks due to thermal contraction, so there is a gap between the bricks. Occurs, and the furnace tightening force that supports the furnace tends to decrease. Therefore, the risk of brick collapse due to deterioration of bricks and cooling contraction after suspension around the CS side kiln mouth is higher.

Furthermore, the furnace lid removal process itself has the following problems, which is a bottleneck in the dismantling work process.
To remove the furnace lid (self-weight 10t, pressing force 15t), it is effective to use a mobile machine (guide car, extruder) that opens and closes the furnace lid during operation, but the mobile machine runs in the entire area in front of the furnace. Therefore, the surrounding dismantling work cannot be done in parallel during that period.
Furnace ducts (CS: dust collection duct, PS: drymen, etc.) cannot be removed in parallel. The reason for this is that the work for removing the furnace lid and the vertical work require that a scaffold for removing the furnace upper duct cannot be set up. Up and down work (simultaneous up and down work) is an iron rule of dismantling work to avoid because it is possible that the object removed by the above work will fall to the work site below.
There are multiple furnace lids removed, and since it is a high temperature of over 300°C, a cooling time (4 hr/piece) is required before carrying out with a trailer, and in the case of a real-scale furnace, only the CS-side furnace lid is required for cooling. It took 5 days.

In addition, in the coke oven that has been stopped, the furnace tightening force by the upper cross tie rod is lower than that in operation due to cooling shrinkage of bricks. Moreover, the bricks near the back stay are agglomerated with the protective plate, so that the bricks do not sink more than the center side of the furnace. As a result, the brick joints near the kiln opening are easy to cut and open, and the brick structure loosens slightly. Therefore, there is no particular protection wall, and there is a high risk that the bricks will collapse or the protective plate will fall off due to the vibration during dismantling from the dismantling side, which directly transmits the vibration of the dismantling. Moreover, when removing the bricks, the upper cross tie rods are removed, so the furnace tightening force is further reduced. Furthermore, the kiln mouth fittings (furnace frame, protective plate) are fixed against the bricks by pressing them with the back stay, but as mentioned above, the cooling force of the bricks and the removal of the upper cross tie rods weaken the pressing force, so they fall off. It's easy to do. Moreover, the protective plate and furnace frame are cracked during long-term use, which increases the risk of falling. In Patent Document 1, there is no provision for dismantling the back stay on the dismantling side and the dismantling of the kiln mouth fittings (furnace frame, protective plate, etc.). For this reason, there was a problem that the safety of the workers could not be sufficiently secured in the work near the kiln mouth on the dismantling side of the coke oven which was stopped.
The present invention is a method of disassembling a combustion chamber brick by suspending a coke oven and renewing it, by closing an opening of one charring chamber kiln port or the like and disassembling the combustion chamber brick wall from the opposite side with a dismantling machine. In order to secure the safety of construction workers for the opening of the kiln opening before brick dismantling, we present a method for curing the opening of the kiln opening that prevents the bricks of the combustion chamber from collapsing.
In addition, we will present a method of shortening the construction period by streamlining the process neck “removing the furnace lid” before brick dismantling.
Furthermore, in order to ensure the safety of the dismantling machine driver and the surrounding workers, it is an object to present a construction method for preventing the bricks and the kiln mouth metal (protective plate, furnace frame) from collapsing and falling.

The gist of the present invention for solving the above problems is as follows.
(1) In a method of dismantling a coke oven in which a dismantling machine is installed on the PS side (pusher side) or the CS side (coke side) and the brick is dismantled toward the opposite side, the opposite side of the furnace lid is A method for disassembling a coke oven, which is characterized in that flying dust of bricks is prevented from falling off with the furnace lid without removing, and the furnace lid is removed after all bricks are dismantled.
(2) The method for disassembling a coke oven according to (1), wherein the dismantling side on which the dismantling machine is installed is the PS side, and the furnace lid that is not removed is the CS side furnace lid.
(3) The method for disassembling a coke oven according to (1) or (2), characterized in that the bricks are disassembled for each zone in which the coke oven is partially divided in the furnace group direction by repeating the following procedure. ..
1) On each of the PS side and the CS side, a horizontal beam connecting adjacent backstays in the furnace group direction is installed under the upper cross tie rod, and both ends of the horizontal beam are fixed to a retaining wall or a deck.
2) The upper cross tie rods that are connected to the back stays, which are the ends of the length range in the furnace group direction of one zone to be dismantled at a time, hold the tension, and the upper cross between the upper cross tie rods that holds the tensions. Release all tie rod tension. Only the upper cross tie rod holding the tension and both ends of the upper cross tie rod are fixed to the back stay to which the respective upper cross tie rods are connected.
3) Make a break in the back stay on the dismantling side, which was connected to the upper part where the tension was released, in the length range in the furnace group direction of the one zone to be dismantled at once.
4) In the backstay horizontal beam on the dismantling side, the horizontal beams within the length range in the furnace group direction of one zone to be dismantled at one time (horizontal beams for one zone) are cut from the horizontal beams of the zones adjacent to both sides. ..
5) After cutting or cutting one or more sets of upper cross tie rods within the range (length range in the direction of the furnace group of one zone to be disassembled at a time) in which the cross beam is cut, the back stay in which the upper cross tie rods are cut is described above. After depressing the furnace metal fittings from the cuts to such an extent that they can be pulled out, the furnace metal fittings are removed.
6) Remove the upper part from the break of the backstay where the cut was made to expose the brick.
7) From the brick dismantling side to the back, demolish and scrape the brick in the zone (1 zone) in which the brick is exposed by removing the upper part from the break of the back stay.
8) After reduce or by scraping the bricks until the risk of brick collapse becomes no, or the height of the brick was removed to low enough dismantling side, move to another zone, to dismantle the bricks.
(4) After performing the above 1) to 3) for all zones to be demolished, for each zone, 4) to 8) are repeated to perform the demolishing of the zones. Method for dismantling coke ovens in Japan.
(5) Before dismantling and scraping the brick of 7), the above 1) is performed for each of the zones to be dismantled, and further 2) to 6) are backstayed, upper cross tie rods, and furnace metal parts. The method for dismantling a coke oven according to (3), characterized in that the brick is disassembled after being exposed to the brick.
(6) The intervals (intervals in one zone) of the upper cross tie rods at both ends of the length range in the furnace group direction to be dismantled at once are 3 to 10 sets, (3) to (5) The method for disassembling the coke oven according to any one of claims 1.
(7) The coke according to any one of (3) to (6), characterized in that a step of installing a diagonal member connecting the back stay and the platform on the opposite side is provided between the above 1) and 2). How to dismantle the furnace.

Since the process of removing the furnace lid on the CS side before dismantling and installing it again was omitted, it was possible to shorten the coke furnace dismantling construction period (efficiency). Further, according to the present invention, it is possible to prevent the bricks, the furnace frame, and the protective plate from falling and falling toward the dismantling machine side, and to prevent the backstay, the furnace frame, and the protective plate from falling over to the side opposite to the furnace.

It is a figure which shows the external appearance of a coke oven. It is a top view which shows the positional relationship of a backstay, a furnace frame, a protection plate, a brick wall, an upper cross tie rod, and the connection part of a back stay and an upper cross tie rod. It is a coke oven top view which showed the area|region divided by the tension holding cross tie rod. It is a figure which shows the state which fixed the tension holding cross tie rod to the back stay. It is a figure which shows the procedure which tilts down the cross tie rod by the side of disassembly, removes a furnace metal fittings, and scrapes out a brick. It is a figure which shows the procedure to the tension release of the cross tie rod between zones (B) and (C) after removing the brick of zone (B). It is a figure which shows the procedure from the cross beam cutting to zone (C) to the removal of the brick of zone (C). It is the figure which showed the case where a diagonal member is provided. It is a figure which shows the direction of the force applied to a brick, when pushing out the coke which has been dry-distilled. It is a flowchart explaining the conventional disassembly flow. It is a flow chart explaining the disassembly flow of the present invention.

The present inventor has earnestly studied the presence or absence of a furnace lid and the decrease in the temperature inside the furnace, and has obtained the following findings.
Five days after the furnace was stopped (gas stopped), the temperature inside the furnace dropped to 350°C or lower without removing the furnace lids on the PS side and the CS side. Then, when the furnace lid on the CS side was removed, the temperature dropped to 200° C. or lower in 2 days. The temperature dropped to 100°C or lower in 3 days. Five days after removing the furnace lid on the CS side, the CS-side kiln brick collapsed, and a part of the collapsed brick fell and fell onto the platform. On the other hand, there was no brick collapse at the PS side kiln.

As described above, just by removing the furnace lid on the CS side, the temperature could be lowered to 100° C. or lower, which is the cooling temperature for brick dismantling workability, in 10 days. Based on this result and the fact that there is not much difference in the size of the kiln mouth on either the CS side or the PS side, in order to satisfy the cooling of brick dismantling workability (100°C or less), the CS side, PS It was thought that about 10 days of cooling would be sufficient if the furnace lid on either side was removed. Since the deterioration of bricks on the CS side is more severe than that on the PS side, it is possible to cool the furnace by leaving the CS side furnace lid to support it and removing the PS side furnace lid. Was given. Furthermore, after removing the PS side furnace lid, it takes more than 20 days for the furnace front duct and dismantling temporary construction work until the brick dismantling starts, so while removing the PS side furnace lid and waiting for cooling, the above The construction period will not be extended, as long as construction work is performed.

Further, the present invention is a method of dismantling a coke oven in which combustion chambers and carbonization chambers are alternately arranged, and is characterized in that bricks are disassembled in each zone into which the coke oven is subdivided in the furnace group direction. Dividing into small division zones reduces the risk of a large amount of bricks and furnace metal fittings collapsing at once, and can be safely disassembled. Each procedure therefor will be described in detail below with reference to FIGS. Although the following example describes the case where the PS side is the disassembly side, the present invention is not limited to disassembly from the PS side because disassembly from the CS side can be similarly disassembled.
FIG. 3 is a plan view of the coke oven viewed from above. In FIG. 3, what is indicated by a dotted line is the tension release cross tie rod 16b in which the tension is released. On the other hand, the solid line shows the tension holding cross tie rod 16a. The PS backstay 14 and the CS backstay 15 are shown to be connected to the backstays at mutually corresponding positions by two sets of upper cross tie rods 16 shown by a dotted line and a solid line. In addition, the parts other than the upper cross tie rod are shown as a sectional view.

1) Process As shown in FIG. 3, first, all the back stays on the PS side and the CS side, which are provided on the respective sides, are all connected by a cross beam 17 that traverses in the reactor longitudinal direction. Then, both ends of the lateral beam 17 are further fixed to the retaining wall 18 or the deck. Here, the retaining wall 18 is a strong wall made of reinforced concrete provided at the outermost end in the furnace group direction where the carbonization chamber 2 and the combustion chamber 3 have been arranged. A deck is a sturdy structure. Since these retaining walls 18 and decks have sufficient strength as compared with the walls between the carbonization chambers 2 and combustion chambers 3 where bricks are stacked, by fixing the cross beams 17 to the retaining walls 18 or decks. The horizontal beam 17 connecting the back stays can be supported. By doing so, the retaining wall 18 or the deck indirectly supports the backstay. One long cross beam 17 may connect all back stays on the PS side or CS side, or a plurality of short cross beams may be connected to each backstay, and as a result, all backstays on either side may be connected. Should be connected in the lateral direction.
By installing the cross beam 17 below the upper cross tie rod in this way, the furnace frame is restrained, so that the bricks, the furnace frame 13a, the protective plate 13b, etc. can be prevented from flying and falling, and the back stay, It is possible to prevent the furnace frame 13a and the protective plate 13b from falling over to the outside of the furnace.

2) Step In this step, the range in which the bricks are scraped at once is divided into small pieces so that bricks and the like other than the small divided areas (zones) are not broken. It can be said that this step is a step relating to determination of a range to be subdivided.
The upper cross tie rod holds the brick of the furnace by the furnace tightening force connecting the PS and CS side backstays. When the furnace is stopped, the brick cools and shrinks, weakening the furnace tightening force. Furthermore, when the upper cross tie rod is removed to dismantle the brick, the furnace tightening force is lost, and the brick or the like is likely to collapse. Therefore, an upper cross tie rod (tension holding cross tie rod 16a) that holds tension (tension between PS side and CS side backstays) at a ratio of one set among several sets is provided, and a plurality of upper cross tie rods between the sets are provided. (Tension release cross tie rod 16b) Release the tension of the set. Although the furnace body brick (brick wall 12 that constitutes the combustion chamber) in the portion clamped by the set of tension holding cross tie rods 16a and the PS-side and CS-side backstays connected to it is weakened by the furnace cooling, However, it is still tightened so it is hard to collapse. On the other hand, since the furnace brick near the tension release cross tie rod 16b is loose, it is easy to tear it down. That is, by tightening the tension-holding cross tie rod 16a, a kind of wall that is hard to collapse is provided vertically to the furnace group. This makes it possible to partition the necessary subdivision zones that do not cause large-scale collapse when demolishing and scraping bricks. This small division zone is preferably set as between 3 and 10 sets of upper cross tie rods. The upper cross tie rods are a set of two in the back stay, so in terms of back stays, there are 3 (in the absence of tension, there are 3 in between, and there is tension in every 4) to 10 intervals (10 in the absence of tension, 11 in between). It is preferable to maintain the tension of the upper cross tie rod connected to the back stay (with tension for each book). If it exceeds 10 pairs, one zone is too wide and the risk of collapse increases, and if it is 2 pairs or less, it is too narrow, resulting in poor efficiency in dismantling. The length of one preferable zone in the furnace group direction is 5 to 15 m in terms of distance.
To hold the tension concretely, as shown in FIG. 4, while the tightening spring 47 of the upper cross tie rod is being tightened with the nut 46, the welding point between the upper cross tie rod and the back stay is kept in that state. It is fixed by welding at 21. By fixing in this way, it is possible to prevent the backstay from falling to the dismantling side after the dismantling proceeds and the bricks have been removed. Further tightening may be performed in order to further improve the furnace tightening force reduced by the cooling shrinkage of the brick. On the other hand, in order to loosen the tension, the nut 46 holding the spring 47 may be loosened.

3) Step In the zone to be disassembled, a break is made in the disassembly side backstay (PS backstay 14b in FIG. 3). The back stay that makes this break is the PS back stay 14b that is connected to the tension release cross tie rod 16b that releases the tension. The back stay uses H-section steel having an H-shaped cross section, and one surface of H is in close contact with the furnace body to suppress expansion of the furnace body. It is preferable that the furnace side single flange is left as a break into the backstay. This is to cut to the T portion of the H-section steel which is not in close contact with the furnace body, and the straight line portion in close contact with the furnace body is kept connected. By keeping the parts connected in this way, it becomes easy to tilt the back stay in the subsequent step 5) to such an extent that the furnace metallurgical object 13 can be pulled out. By making the cuts as described above, it becomes easier to bend the PS backstay 14b in the front direction of the furnace, and it is easy to pull out the furnace body metallurgy 13 sandwiched between the brick and the PS backstay 14b from the gap created by bending. You can Further, the PS back stay 14b can support the furnace metalwork 13 to some extent until the PS back stay 14b is bent and even after the PS back stay 14b is bent (see FIG. 5). Since the furnace body metal piece 13 is supported to some extent by the PS backstay 14b, unlike the case where the PS backstay 14b is removed all at once, it is possible to prevent the furnace body metal piece 13 from being suddenly collapsed and dropped. Furthermore, since the PS back stay 14b can be removed efficiently with a small external force, it is possible to prevent the PS back stay 14b from collapsing toward the disassembly side. Since the external force is small, the external force (vibration, impact) on the remaining bricks is mitigated and the brick collapse can be prevented.
The break of the PS backstay 14b may be provided at the uppermost portion of the PS backstay 14b, that is, anywhere below the tension release cross tie rod 16b, but the floor of the combustion chamber 3 of the PS side backstay 14b may be provided. It can be provided at a height of approximately the surface height, or can be provided at a height between the floor surface of the combustion chamber 3 and the tension release cross tie rod 16b. When the height of the furnace is high, the floor height of the combustion chamber 3 is provided with a break, and when the PS backstay 14b is later cut and removed from the cut, it supports a pile of deteriorated bricks. Disappears. On the other hand, a cut is made around the middle height, only the PS backstays 14b above it are removed, and then the bricks above the height of the removed PS backstays 14b are first scraped out, so You can reduce the risk of collapse. In this way, if the bricks in the upper part of the furnace are removed in stages, it is preferable that the PS backstay 14b be cut at a predetermined height above a certain level. Further, if the height is such that the brick does not collapse even if the PS back stay 14b is removed at a time, the number of steps is reduced, so it is preferable to make a cut at a lower position. A preferable height for making a break is -1 to 3 m based on the height of the combustion chamber floor surface.

4) Process In the horizontal beam 17 in which the back stays on the dismantling side are connected, the horizontal beams 17 in the length range in the furnace group direction of one zone to be dismantled at one time (horizontal beams for one zone) are the horizontal beams 17 of the zones adjacent to both sides thereof. Disconnected from. Before the first zone is dismantled, the crossbeam 17 has to cut at two points. On the other hand, when the first zone is dismantled and then the adjacent zone is disassembled, the cutting may be done at one place, so the cross beams 17 of both the adjacent zones are set to “disconnected”. For example, in order to dismantle the first zone, among the lateral beams 17 on the dismantling side, the lateral beam 17 between the tension holding cross tie rods 16a is cut at two places. This step is the first step to cut the part of the cross beam 17 that closes the zone to be demolished to create an access port that allows the demolisher to access the bricks to be demolished in the furnace. By cutting the cross beam 17 only between the tension holding cross tie rods 16a or cutting and removing the cross beam 17, the strength of other parts is maintained, and only the target zone (only in zone (B) of FIG. 3) is safely secured. Can be dismantled.

5) Step After cutting or cutting off one or more sets of the tension release cross tie rods 16b within the range where the horizontal beam 17 is cut, the furnace metalwork 13 can be pulled out from the PS back stay 14b connected to the cut tension release cross tie rods 16b. After the tipping down, the furnace metal fitting 13 above the break of the PS backstay 14b is removed. The reason for cutting or cutting off one or more sets of the tension release cross tie rods 16b within the range where the horizontal beam 17 is cut off is to allow the PS backstay 14b on the disassembly side to be tilted. Further, the furnace metalwork 13 is removed in order to prevent the brick from falling before the brick is dismantled. As described in 3) step, the PS backstay 14b with the tension release cross tie rod 16b cut is tilted to such an extent that the furnace metal fitting 13 can be pulled out by the PS backstay 14b to some extent until the furnace metal fitting 13 is removed. This is to support.
Further, this step is also a step for preparing to expose the bricks by scraping the bricks by scraping down the PS backstay 14b on the dismantling side and removing the furnace metal piece 13. Since the PS backstay 14b falls down from the cut, a space between the PS backstay 14b and the brick is formed above the cut, and the furnace metalwork 13 can be taken out first.

6) Step The upper part of the cut PS backstay 14b is removed to expose the brick wall 12. By removing the PS backstay 14b above the break, an access port can be created that allows the demolition machine to access the bricks of the furnace. The removal of the PS backstay 14b may be divided into a plurality of times from the break to the upper part and the lower part, or the break may be inserted at the base of the PS backstay 14b and performed once.

7) Step From the dismantling side to the inner side thereof, the brick in the zone (one zone shown by zone (B) in FIG. 3) between both ends of the tension holding cross tie rod 16a is dismantled and scraped out (see FIG. 6A). On the opposite side of the above-mentioned 1 zone, a back stay is connected and strengthened by a lateral beam 17. In addition, this one zone is surrounded by two brick walls 12 to which the furnace tightening force is applied because the tension of the tension holding cross tie rod 16a is held. The two brick walls 12 are collapsed because the furnace body is strengthened by the tightening force by the PS back stay 14, the CS back stay 15, and the tension holding cross tie rod 16a connecting the two. Hard and safe. On the other hand, the area sandwiched between the brick walls 12 that are hard to collapse can be easily removed because no tension is applied to the bricks. In addition, since one zone is small, the bricks in this range are relatively small and do not collapse in large amounts, so there is little danger of brick collapse during dismantling. Further, since the dismantling side back stay 14b has already been removed and the furnace metallurgy 13 has also been removed, there is no danger of the furnace metallurgy 13 falling off. When the zone (C) is dismantled after the zone (B) is dismantled, the brick wall 12 in which the furnace body is reinforced by the tightening force is removed from the tension holding cross tie rod 16a between the zones (B) and (C). However, since the brick wall 12 on the zone (D) side remains, it is possible to prevent chain-like collapse in the zone (D) direction due to dismantling of the zone (C).

8) Process After scraping bricks out and removing them, move to another zone and dismantle bricks. Moving to another zone is roughly when the brick is scraped to the demolition side until the risk of brick collapse disappears and reduced, or when it is removed until the height of the brick becomes sufficiently low. No particular strict rules are set, and if the common sense can handle the bricks in the zone, move to another zone and dismantle the bricks in the same way.
In addition, when removing the bricks of the adjacent zone (C) after removing the bricks of the zone (B), the tension holding cross tie rod 16a between the zone (B) and the zone (C) and the cross tie rod The procedure for removing the tightened brick wall and the PS back stay 14a connected to the cross tie rod is performed as follows, as shown in FIG. 6, for example. After removing the bricks in the zone (B), the tension of the tension holding cross tie rod 16a between the zones (B) and (C) is released. After that, the PS backstay 14b, the horizontal beam between the zone (C) and the zone (D) is cut (this horizontal beam may be cut in advance), and the PS having the cut in the zone (C) is made. Back stay 14 (You may make a break just before pulling it down.) Pull the PS back stay 14 (former PS back stay 14a) that partitions the zone (B) and the zone (C) where the tension is released. Defeat and remove the furnace body hardware. Then, the bricks in zone (C) are removed.

The order of performing steps 1) to 8) is in the order of the numbers, but when removing each zone, various methods are used to determine which step is performed before starting the demolishing of bricks in each zone. is there.
In a preferred embodiment of the present invention, the steps from 1) to 2) and 3) are first performed in each zone, and then 4) to 8) in each zone in which bricks are scraped at once. This is a method of repeating the step. By combining 2) and 3) in advance in each zone, work efficiency is improved. If the transverse beams 17 in steps 4) to 6), for example in step 4), are cut in a plurality of zones before the brick is scraped out in the step 7), the strength around the dismantling side furnace in the scraped out zone decreases, and Not very desirable as it increases the risk of collapse. The same applies to the steps 5) and 6) regarding the removal of the furnace metal 13 and the PS backstay 14b. In addition, after the bricks in one zone are scraped out and removed, the zone in which the bricks are scraped out and removed next is preferably the adjacent zone. When processing the discrete zones, the horizontal beams must be divided at each place, and some horizontal beams are not fixed to the retaining wall 18 or deck, and the length of the horizontal beams supporting the backstay becomes shorter. Is reduced.
However, if importance is placed on efficiency, bricks may be simultaneously exposed to the demolition side from a plurality of zones partitioned by the tension holding cross tie rods 16a, and the bricks may be scraped out simultaneously by a plurality of demolition machines.
In addition, the dismantling side is wide and easy to work, so the exemplified PS side is preferable.

Further, as shown in FIG. 7, it is preferable to provide a step between 1) and 2) of installing a diagonal member 20 that connects the CS backstay 15 on the opposite side and the platform. The other side is the last to be removed after treating the bricks in each zone, so it must be prevented from collapsing by then. Since the platform through which the dolly passes and the CS backstay 15 are not welded, and the CS backstay 15 is self-supporting, a diagonal member that connects to the platform is provided on the backstay on the opposite side. It is preferable to prevent the collapse of the.
[Specific Embodiment]

An embodiment of the disassembling method of the present invention will be described by taking the case of disassembling from the PS side as an example. Even when disassembling from the CS side, the step of removing the PS side furnace lid 11 and closing the PS side can be omitted, so the disassembling side is not limited to the PS side. However, it is preferable to disassemble from the PS side because the PS side has no special installation machine other than the extruder and thus has a large working space. FIG. 3 is a top view of the coke oven. In FIG. 3, the PS backstay 14 and the CS backstay 15 are connected to the backstays at mutually corresponding positions by two sets of upper cross tie rods 16 shown by a dotted line and a solid line. The horizontal beam 17 that reinforces the back stay is installed by connecting the PS back stays 14 to each other and the CS back stays 15 to each other. Further, the cross beam 17 is fixed to the retaining wall 18 by braces 19. Fix it by bolting or welding. By this process, the backstay, the protective plate, the furnace frame, and the furnace lid are prevented from falling to the side opposite to the furnace.

By this time, the CS-side furnace lid is usually removed at least once together with the PS-side furnace lid, but it remains in the present invention. By closing the kiln opening on the CS side while leaving the furnace lid on the CS side, it is possible to prevent the bricks, the furnace frame, and the protective plate from flying and falling.

The PS backstays 14 and CS backstays 15 are connected to each other by the horizontal beams 17, and fixed to the retaining wall 18, and several backstays, specifically three (3 sets of cross tie rods) are shown by solid lines. The two sets of tension holding cross tie rods 16a thus set are fixed to the backstays to which the cross tie rods are connected, while holding the tension respectively. Next, the tension of the tension release cross tie rod 16b indicated by the dotted line between the tension holding portions 16a is released. In this way, the tension-holding cross tie rod 16a divides the zone into small regions as shown in A to L. Here, the preferable interval of the set that holds the tension is 3 to 10 sets.

Next, a cut is made at a predetermined height of the PS-side backstay 14b that was connected to the tension release cross tie rod 16b. The cut is made up to the T portion outside the furnace of the H-section steel. The cut can be made with a gas burner or the like.

After that, the brick is exposed, but it is advisable to remove the rising pipe of the furnace, the PS side platform, etc. before that. Further, it is advisable to secure a scaffold around the PS side, which is the dismantling side, by laying an iron plate on the change valve connection port under the platform and on the flue top plate.

A case where the brick in the area 1 zone (zone (B)) of B in FIG. 3 is first scraped will be described. The cross beam between X1 and X2 between the tension holding cross tie rods 16a is cut. That is, the cross beam is cut at the points X1 and X2. At this time, the cross beam can be cut by a nibler attached to the arm tip of the dismantling machine, a gas burner, or the like. The cross beam thus cut may be cut off from the PS backstay 14b, or may remain bonded to the backstay 14b at this stage.

Next, in step 5), the cross tie rods 16b connected to the backstays 14 in the zone (B) are each cut. Since the cross beam 17 is cut at two places between the zones (B) and the cross tie rod 16b is cut, the back stay 14b can be tilted from the cut toward the outside of the furnace. By tilting the back stay 14b as shown in FIG. 5(a), the furnace body metal piece 13 held by the back stay 14b can be removed.

After removing the PS-side furnace metalwork 13, the PS backstay 14b is removed from the cut. If the PS backstay 14b is removed, bricks with a height higher than the PS backstay 14b that have been removed and left are exposed in the width of the zone (B) in the furnace group direction. A relatively small amount of brick is scraped out and processed as shown in FIG. 5(b). At this time, the bricks near the furnace lid 11 on the CS side are left about 1000 mm or more from the bottom of the furnace lid 11 so that the furnace lid 11 does not fall to the dismantling side. As a result, the protective plate 13b, the furnace frame 13a, and the furnace lid 11 are maintained self-supporting and prevented from falling to the dismantling side. If necessary, the remaining PS backstay 14b is removed from the root, the brick below the cut is exposed, and the brick is scraped from the PS direction for processing.

After the processing of the bricks in the zone (B) is completed, the same step is repeated as the step 8), and the bricks in the zone (A), the zone (C) and the adjacent zone are processed one by one.

When the bricks in all zones A to L have been scraped from the PS side, the furnace lid, furnace frame, and protective plate are pulled down as one unit with the auxiliary heavy machine and the main machine. After that, the braces 19 for fixing the lateral beam 17 connecting the CS back stays 15 and the retaining wall 18 are removed, and the CS back stays 15 and the lateral beams 17 are connected together and pulled down to the PS side, thereby the structure on the CS side. Things are finally removed. At this time, the furnace lid 11 that was fixed to the CS back stay 15 and had blocked the kiln on the CS side, the protection wall on the CS side that was provided to prevent scattering of bricks on the CS side, etc. You may pull it down.

The main steps of the present invention described above are summarized in FIG. Compared with FIG. 9 which is a conventional flow, 5 days required for removing the furnace lid on the CS side before dismantling and 2 days required for closing the kiln mouth on the CS side with a wire net are no longer necessary. By finally removing the furnace lid on the CS side during the brick dismantling period, the brick dismantling period was extended by 0.5 days, but the total construction period should be shortened by 6.5 days. I was able to.

Further, since the furnace lid is left behind, the opening of the CS side kiln is eliminated, and the risk of brick collapse is zero. In addition, since it is dismantled in small areas, bricks, furnace frames, and protective plates can be prevented from falling and falling, and backstays, furnace frames, and protective plates can be prevented from falling to the side of the anti-furnace, so dismantling work can be performed safely be able to.

According to the present invention, there is a particular industrial applicability that the coke oven can be disassembled safely and in a short construction period. In addition, it has extremely useful industrial utility that can prevent human and physical loss.

1... Heat storage chamber, 2... Carbonization chamber, 3... Combustion chamber, 4... Coal tank, 5... Orbit, 6... Charging car, 7... Extruder, 8... Guide car, 9... Coke carrier, 10... Platform, 11 ... furnace lid, 12... brick wall, 13... furnace metal fitting, 13a... furnace frame, 13b... protective plate, 14... PS backstay, 14a... connected to PS backstay, 14b... 16b PS back stay, 15... CS back stay, 15 a... CS back stay connected to 16 a, CS back stay connected to 15 b... 16 b, 16... Cross tie rod, 16 a... Tension holding cross tie rod, 16 b... Tension Release cross tie rod, 17... Horizontal beam, 18... Retaining wall, 19... Brace, 20... diagonal member, 21... Welding point, 46... Nut, 47... Spring, PS... Pusher side (extruder side), CS... Coke side ( (Guide car side)

Claims (7)

In the dismantling method of a coke oven, in which a dismantling machine is installed on the PS side (pusher side) or the CS side (coke side) and the brick is dismantled toward the opposite side where the dismantling machine is installed, a furnace on the opposite side before the brick is demolished A method for disassembling a coke oven, characterized in that the lid is not removed, the bricks are prevented from flying down by the oven lid, and the oven lid is removed after all the bricks are disassembled. The dismantling method of the coke oven according to claim 1, wherein the dismantling side on which the dismantling machine is installed is the PS side, and the furnace lid that is not removed is the CS side furnace lid. The method for disassembling a coke oven according to claim 1 or 2, wherein the bricks are disassembled for each zone in which the coke oven is partially divided in the furnace group direction by repeating the following procedure.
1) On each of the PS side and the CS side, a horizontal beam connecting adjacent backstays in the furnace group direction is installed under the upper cross tie rod, and both ends of the horizontal beam are fixed to a retaining wall or a deck.
2) The upper cross tie rods that are connected to the back stays, which are the ends of the length range in the furnace group direction of one zone to be dismantled at a time, hold the tension, and the upper cross between the upper cross tie rods that holds the tensions. Release all tie rod tension. Only the upper cross tie rod holding the tension and both ends of the upper cross tie rod are fixed to the back stay to which the respective upper cross tie rods are connected.
3) Make a break in the back stay on the dismantling side, which was connected to the upper part where the tension was released, in the length range in the furnace group direction of the one zone to be dismantled at once.
4) In the backstay horizontal beam on the dismantling side, the horizontal beams within the length range in the furnace group direction of one zone to be dismantled at one time (horizontal beams for one zone) are cut from the horizontal beams of the zones adjacent to both sides. ..
5) After cutting or cutting one or more sets of upper cross tie rods within the range (length range in the direction of the furnace group of one zone to be disassembled at a time) in which the cross beam is cut, the back stay in which the upper cross tie rods are cut is described above. After depressing the furnace metal fittings from the cuts to such an extent that they can be pulled out, the furnace metal fittings are removed.
6) Remove the upper part from the break of the backstay where the cut was made to expose the brick.
7) From the brick dismantling side to the back, demolish and scrape the brick in the zone (1 zone) in which the brick is exposed by removing the upper part from the break of the back stay.
8) After reduce or by scraping the bricks until the risk of brick collapse becomes no, or the height of the brick was removed to low enough dismantling side, move to another zone, to dismantle the bricks. The coke oven according to claim 3, wherein the zones 1) to 3) are disassembled and then the zones 4) to 8) are repeatedly performed for each zone. Dismantling method. Before dismantling and scraping the brick of 7), perform 1) for each of the zones to be dismantled, and further 2) to 6) for the back stay, upper cross tie rod, and furnace metal parts. The method for disassembling a coke oven according to claim 3, wherein the brick is disassembled after performing the operation to expose the brick. The interval (interval of one zone) of the upper cross tie rods at both ends of the length range in the furnace group direction to be disassembled at once is 3 to 10 sets, and any one of claims 3 to 5 is characterized. Dismantling method of the described coke oven. The method for disassembling a coke oven according to any one of claims 3 to 6, further comprising a step of installing a diagonal member connecting the back stay and the platform on the opposite side between the steps 1) and 2). ..

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