JP6273846B2 - Coke oven closing structure and furnace closing method - Google Patents

Description

  The present invention provides a backstay arranged in the vertical direction on both sides of the coke oven in the longitudinal direction of the coke oven by applying a tightening force by a cross tie rod penetrating the inside of the top brick, thereby constraining the brick structure of the coke oven. The present invention relates to a furnace clamping structure and a furnace clamping method.

  In a chamber furnace type coke oven, as shown in FIG. 6, a large number of carbonization chambers 2 and combustion chambers 3 are alternately arranged, and a furnace wall is constructed of bricks between the carbonization chambers and the combustion chambers. . The longitudinal direction of the carbonization chamber is referred to as the furnace length direction 31. The arrangement direction of a large number of carbonization chambers is referred to as a furnace group length direction 32. In order to prevent the brick structure constructed in this way from loosening, backstays 4 are arranged perpendicular to both ends in the furnace length direction, and the brick structure is restrained by the furnace clamping force between the backstays at both ends. In the furnace group length direction 32, a backstay is arranged corresponding to the combustion chamber arrangement part. The backstay is a high-rigidity H-section steel, and one or two pairs are set upright and arranged at both ends in the furnace length direction. Between the backstays at both ends in the furnace length direction, two steel bars called cross tie rods 5 are arranged in each of the upper and lower sides, or six in the case of many, and the cross tie rods 5 and the backstays 4 are connected to the nuts 46 and the springs 47. By connecting with each other, a tightening force is generated between the two backstays, thereby constraining the brick structure between the backstays. Hereinafter, unless specifically limited, in the present specification, the cross tie rod means a cross tie rod disposed on the top side of the furnace.

  The cross tie rod is disposed so as to penetrate into a groove or hole provided in the furnace-top brick (hereinafter, the groove or hole in which the cross tie rod is disposed is collectively referred to as “cross tie rod groove”). Therefore, the heat of the high-temperature combustion chamber or carbonization chamber is transmitted to the cross tie rod through the brick at the top of the furnace, and the temperature of the cross tie rod rises. It becomes impossible to maintain, and furthermore, the allowable tensile stress of the cross tie rod may be lowered and cut off.

  At one end of the top of the carbonization chamber, there is provided a riser 24 for discharging the gas (coke oven gas) generated in the carbonization chamber 2 during coal carbonization. Among the cross tie rods arranged in the furnace length direction, the portion adjacent to the riser pipe is close to the high temperature gas, so the heat of the gas travels along the furnace top brick and heats the cross tie rods. The temperature may reach 500 ° C. or higher. Since the cross tie rod is in a state in which a tensile force is applied, the cross tie rod may be stretched and further torn by this high temperature state.

  When the binding force due to the cross tie rods decreases or disappears in this way, the furnace that constitutes the coke oven is affected by temperature changes due to repeated charging and unloading operations in each carbonization chamber, or the influence of kiln exit. The body brick will expand in the furnace length direction.

  As a means for preventing the temperature rise of the cross tie rod, a method of providing an outer tube so as to surround the cross tie rod in the longitudinal direction of the cross tie rod has been put into practical use in a coke oven already constructed in the Showa 50s. Furthermore, in Patent Document 1, the protection tube of the cross anchor (cross tie rod) is a double tube, an air heat insulating portion is formed between the outer tube and the inner tube, and an air heat insulating portion between the inner tube and the cross anchor is The invention which suppresses the heat transfer to the cross anchor by the synergistic effect is disclosed. In Patent Document 2, by disposing a member that supports a tension rod (cross tie rod) at the lower end of the inner surface of the protection pipe (outer tube), heat conduction transmitted to the tension rod via the protection pipe is reduced, and the tension rod An invention for preventing local overheating is disclosed, and a short pipe for injecting fluid through the furnace top brick is provided on the upper surface of the protective pipe, and cooling water or the like is injected from the short pipe for injecting fluid even when the rod is partially heated. Thus, an invention is disclosed in which the heated portion can be cooled and the life can be extended.

  However, even if natural air cooling or forced air in the outer tube surrounding the cross tie rod is circulated, it has little effect on local overheating of the cross tie rod due to local high temperature as described above, and still remains The expansion phenomenon of the cross tie rod is not resolved. In addition, even if a method of blowing cooling water using a short pipe for fluid blowing provided on the upper surface of the outer pipe is used, if there is no drain hole or evaporating moisture discharge hole, the blowing amount is limited and the tie rod is overheated. In addition, there has been a problem that by locally injecting water, a temperature difference is generated in the longitudinal direction or cross section of the tie rod, resulting in brittleness.

  Patent Document 3 discloses two furnace clamping structures for realizing cooling capable of preventing local overheating of a cross tie rod in a coke oven. In the first means, the cross tie rod is cooled by flowing a cooling medium through the pipe or the outer pipe surrounding the cross tie rod or the outer pipe surrounding the cross tie rod. However, the first means has a complicated structure and a high equipment cost, and may not fit in the groove of the top brick where the cross tie rod is installed. In the second means, as shown in FIG. 5A, a hollow steel pipe is used as the cross tie rod 5, and the cross tie rod is cooled by flowing air as a cooling medium through the hollow portion 17 of the hollow steel pipe.

Japanese Utility Model Publication No. 5-30137 Registered Utility Model No. 3000259 JP 2004-124001 A

  The bricks constituting the carbonization chamber and the combustion chamber are thermally expanded in the furnace length direction when operated and kept at a high temperature as compared to the normal temperature state during construction. And the amount of thermal expansion also changes according to the operating condition of the coke oven. The positions of the backstays arranged at both ends in the furnace length direction change according to the thermal expansion of the carbonization chamber. Since the equipment for supplying the cooling air to the cross tie rod is fixed to the backstay, the equipment will change its position in the furnace length direction in accordance with the position fluctuation of the backstay. On the other hand, the cross tie rod and the brick structure have different linear expansion rates, so the positional relationship between the air supply equipment and the cross tie rod end changes according to the expansion of the carbonization chamber, and the air supply equipment and the cross tie rod end It becomes difficult to connect the air supply pipe between the two. Next, looking at the secular change in length, the length of the brick structure expands at a slow rate under the same operating conditions, whereas the length of the cross tie rod shows the temperature change in summer and winter. Since it changes over time due to repeated temperature changes such as rain and rainfall, it is difficult to connect the air supply piping between the air supply equipment and the end of the cross tie rods over a long period of time. A first object of the present invention is to provide means for connecting an air supply pipe between an air supply facility and a cross tie rod end.

  In a coke oven of the furnace group type, a large number of carbonization chambers and combustion chambers are arranged in the furnace group length direction. A backstay is arranged for each combustion chamber, and a cross tie rod is also arranged for each backstay. Therefore, the number of cross tie rods is large in the furnace group length direction. In the furnace clamping structure in which the hollow tie rod is used as the cross tie rod and the cross tie rod is cooled by flowing air as a cooling medium in the hollow portion of the hollow steel pipe, which is the second means described in Patent Document 3, in the furnace group length direction. It has been difficult to uniformly supply cooling air to each of a large number of arranged cross tie rods. A second object of the present invention is to uniformly supply cooling air to each of a plurality of cross tie rods arranged in the furnace group length direction.

  The space inside the carbonization chamber is filled with coke oven gas, and the coke oven gas leaks to the cross tie rod groove via the brick joint of the carbonization chamber top brick structure. The coke oven gas is a flammable gas, mixes with the outside air in the cross tie rod groove, and frequently causes small explosions in the cross tie rod groove. When a small explosion occurs, not only does the impact increase the opening of the surrounding brick joints and the possibility of CO gas leaking onto the furnace increases, but the high temperature flame contacts the cross tie rod and brings its high temperature, Reduce its lifespan. A third object of the present invention is to prevent a small explosion of coke oven gas in a cross tie rod groove.

The coke oven gas leaking into the cross tie rod groove contains an S content of about 2 to 8 grams / m ^3, which causes corrosion of the cross tie rod disposed in the cross tie rod groove. When the cross tie rod is corroded, the effective outer diameter of the cross tie rod is reduced, which eventually causes the cross tie rod to break. A fourth object of the present invention is to prevent corrosion of the cross tie rod due to contact with coke oven gas.

That is, the gist of the present invention is as follows.
(1) In a coke oven furnace clamping structure in which a fastening force is applied to the backstay 4 by a plurality of cross tie rods 5 arranged in the coke oven group length direction, a hollow steel pipe is used as the cross tie rod 5 and the hollow portion 17 of the hollow steel pipe Air flows as a cooling medium,
An air supply pipe (hereinafter also referred to as “pillow pipe 11”) extending in the length direction of the furnace group is disposed, and the pillow pipe 11 is provided with a plurality of branch pipes 12 for branching the supply air, and one or a plurality of cross tie rods 5 from each branch pipe 12. Air is supplied to each branch pipe, and each branch pipe 12 and the cross tie rod 5 are connected by a flexible pipe 14 ,
An alloy steel pipe containing Mo of either an alloy steel pipe for a boiler / heat exchanger specified in JIS G3462 or an alloy steel pipe for piping specified in JIS G3458 is used as the cross tie rod. Construction.
(2) The coke oven furnace clamping structure according to (1) above, wherein the branch pipe 12 has a flow rate adjusting mechanism 15 for adjusting the air flow rate.
(3) In a coke oven furnace clamping structure in which a clamping force is applied to the backstay by a plurality of cross tie rods arranged in the coke oven group length direction, a hollow steel pipe is used as the cross tie rod 5, and a cooling medium is provided in the hollow portion 17 of the hollow steel pipe As air flows,
The furnace top brick upper has a cross tie rod groove 22 extending in the Rochow direction, the cross tie rod 5 is housed in the cross tie rod groove 22, within the groove Ri Na filled with granular material 18,
An alloy steel pipe containing Mo of either an alloy steel pipe for a boiler / heat exchanger specified in JIS G3462 or an alloy steel pipe for piping specified in JIS G3458 is used as the cross tie rod. Construction.
(4) It has a cross tie rod groove 22 extending in the furnace length direction on the top side of the furnace top brick, the cross tie rod 5 is accommodated in the cross tie rod groove 22, and the groove is filled with the granular material 18. Roshime structure of coke oven according to the above (1) or (2), characterized.
( 5 ) A furnace-clamping method using the furnace-clamping structure for a coke oven according to any one of (1), (2), or (4) above, wherein the flow rate adjustment mechanism 15 is adjusted in the direction of the furnace group length. A furnace clamping method for a coke oven, characterized in that the flow rate of air supplied to the cross tie rods arranged in is adjusted so as to be uniform regardless of the position in the furnace group length direction.

  The present invention relates to a coke oven furnace clamping structure in which a clamping force is applied to a backstay by a plurality of cross tie rods arranged in the length direction of the coke oven group. A hollow steel pipe is used as a cross tie rod, and a cooling medium is used as a cooling medium in the hollow portion of the hollow steel pipe. When flowing air, by connecting the branch pipe that supplies air and the cross tie rod by flexible piping, even if the position of the branch pipe and the end of the cross tie rod changes, it is possible to supply air without any trouble. It becomes.

  The present invention is also intended to prevent explosion by filling the inside of the cross tie rod groove with powder particles even if coke oven gas is mixed into the cross tie rod groove and outside air is mixed. Can do.

  Further, the present invention uses an alloy steel pipe containing Mo as a cross tie rod, thereby delaying the thinning due to corrosion of the cross tie rod, increasing the life of the cross tie rod, and being excellent in high temperature strength. It is possible to increase the cooling effect by reducing the thickness of the hollow steel pipe.

It is a fragmentary perspective view which shows an example of the furnace clamping structure of the coke oven of this invention. It is a figure which shows an example of the flexible piping used with the furnace clamping structure of the coke oven of this invention, (a) U curved pipe, (b) 2 eccentric curved pipe, (c) Circular curved pipe, (d) Swivel curved pipe is there. It is the fragmentary figure which shows an example of the furnace clamping structure of the coke oven of this invention, (a) is a top view, (b) is a side view. It is a partial top view which shows an example of the furnace clamping structure of the coke oven of this invention. It is sectional drawing which shows the inside of a cross tie rod groove | channel. It is a figure which shows the furnace clamping structure of a coke oven, (a) is a side view, (b) is a top view, (c) is a front view.

  As shown in FIG. 6, the backstay 4 of the coke oven is usually an H-section steel that is erected vertically at the positions of both ends of the combustion chamber 3. The cross tie rod is disposed so as to penetrate into a groove or hole (collectively referred to as “cross tie rod groove 22”) provided in the furnace-top brick. The back stay 4 at both ends of the furnace length direction 31 is connected by a nut 46 and a furnace clamping spring 47. A clamping force is applied to the backstay 4 by the furnace clamping spring 47 used in the connecting portion.

  In the present invention, a hollow steel pipe having a hollow portion 17 as shown in FIG. 5 is used as the cross tie rod 5, and the cross tie rod is cooled by flowing air as a cooling medium through the hollow portion 17 of the hollow steel pipe.

  In the coke oven, each furnace group has a number of cross tie rods 5 in the furnace group length direction 32, and each cross tie rod is provided with a pipe for flowing the cooling medium of the present invention. Become more. In the present invention, air supply pipes (pillow pipes 11) extending in the length direction of the furnace group are arranged, and a plurality of branch pipes 12 for branching supply air are provided in the pillow pipes 11, and air is supplied from each branch pipe 12 to one or a plurality of cross tie rods 5. Supply. As shown in FIG. 4A, air may be supplied from one branch pipe 12 to one cross tie rod 5. Preferably, as shown in FIG. 1, the tip of one branch pipe 12 is further branched into two branch branch pipes 13, and the ends of the two branch branch pipes 13 are connected to two cross tie rods 5 respectively. Also good. In the present invention, the branch pipe 13 including the branch pipe 13 is referred to as a branch pipe 12. It is preferable that the branches to be supplied from the branch pipe 12 are a set of cross tie rods for each carbonization chamber.

  The pillow tube 11 and the branch tube 12 for supplying cooling air to the cross tie rod 5 are supported by a support device fixed to the backstay 4. On the other hand, as described above, since the positions of the backstays 4 arranged at both ends in the furnace length direction change according to the thermal expansion of the carbonization chamber, the pillow tube 11 and the branch pipe 12 correspond to the position fluctuation of the backstay 4. The position in the furnace length direction will fluctuate. On the other hand, when the coking chamber expands in the longitudinal direction and a change in length with the cross tie rod occurs, the positional relationship between the branch pipe of the air supply equipment and the end of the cross tie rod changes, and the branch pipe and the cross tie rod It becomes difficult to connect the air supply pipe between the ends. As for the secular change in length, the length of the brick structure changes irregularly due to joint opening and cracking between the bricks due to operating conditions, penetration of brick powder and mortar powder into the part, etc. Since the length changes over time due to factors different from brick structures, such as temperature changes in summer and winter and repeated temperature changes such as rainfall, the connection of the air supply piping between the branch pipe and the end of the cross tie rod is long over time. It becomes difficult (first problem of the present invention).

  In this invention, the said 1st subject was solved by connecting between each branch pipe 12 and the cross tie rod 5 by the flexible piping 14. FIG. As shown to Fig.4 (a), when a branch pipe does not have a branch branch pipe, the flexible pipe 14 connects between the front-end | tip part of the branch pipe 12, and the cross-tie-rod 5 end part. As shown in FIG. 1, when the branch pipe 12 has a branch branch pipe 13, the flexible pipe 14 connects between the distal end portion of the branch branch pipe 13 and the end portion of the cross tie rod 5. Flexible piping is a general term for piping having flexibility, a U-curved pipe shown in FIG. 2 (a), a two eccentric curved pipe shown in FIG. 2 (b), a circular curved pipe shown in FIG. 2 (c), It is a concept including the flexible bend shown in FIG. Use of a flexible curved pipe is preferable because the space for installing the flexible pipe can be minimized. As the flexible curved pipe, for example, a thin stainless steel pipe whose surface is bellows processed or a steel pipe whose surface is protected by a stainless steel net is preferably used.

  In the present invention, as described above, the air supply pipe (pillow pipe 11) extending in the furnace group length direction 32 is arranged, and the pillow pipe 11 is provided with a plurality of branch pipes 12 for branching the supply air. To supply air. Since air flows in one direction through the pillow tube 11, a pressure loss based on the resistance of the fluid occurs, and the air pressure on the side (upstream side) where air is supplied to the pillow tube 11 is sufficiently high, but the air supply On the downstream side, the air pressure in the pillow tube decreases. Therefore, the amount of air supplied to the cross tie rod is insufficient on the downstream side, although the upstream side where the pillow tube pressure is high is sufficient. If an attempt is made to secure the downstream flow rate, the flow rate becomes excessive on the upstream side. It is necessary to uniformly supply cooling air to each of the cross tie rods arranged in a large number in the furnace group length direction (second problem of the present invention). In addition, the carbonization chambers and the combustion chamber rows constituting the furnace group are subject to temperature variations as they age. In that case, it is preferable to increase the flow rate of the cooling air for the cross tie rod whose temperature is excessively increased as compared with other cross tie rods.

  The present invention can solve this problem by providing a flow rate adjusting mechanism 15 for adjusting the air flow rate in the branch pipe 12 that supplies air to the cross tie rod. The flow rate adjusting mechanism 15 is provided for each branch pipe 12. When the tip of the branch pipe is further branched into branch branches, a flow rate adjusting mechanism 15 is provided before branching as shown in FIG. 4B, and a flow rate adjusting mechanism is provided in each branch branch pipe 13 after branching as shown in FIG. Any of the methods of providing 15 can be adopted. As the flow rate adjusting mechanism 15, a normal flow rate adjusting valve such as a ball valve can be preferably used. When optimizing the air flow rate by adjusting the flow rate adjusting mechanism for each branch pipe, an air flow meter may be provided for each branch pipe, and the flow rate may be adjusted so that the air flow rate becomes constant. Alternatively, a thermometer may be installed on the cross tie rod, and the air flow rate may be adjusted so that the cross tie rod temperature is cooled to the target temperature.

  In adjusting the air flow rate for each branch pipe, the effect of the present invention can be sufficiently exerted by simply adjusting the non-uniform air flow rate based on the pressure loss in the pillow tube. And in that case, the pressure loss situation in the pillow tube can be predicted, and the resistance amount of the air flow rate adjustment mechanism for setting the air flow rate to the target value according to the air pressure at the branch pipe entrance from the pillow tube is predicted However, instead of providing a variable resistance force valve, a resistance plate with a fixed resistance force (orifice) may be provided as the air flow rate adjusting mechanism of the present invention. The upstream side where the pressure of the pillow tube is high increases the resistance, and the downstream side where the pressure of the pillow tube is low decreases the resistance.

  As shown in FIG. 5, the cross tie rod 5 is disposed in a cross tie rod groove 22 provided in the furnace-top brick 21. The coke oven gas that fills the upper part of the carbonization chamber leaks to the cross tie rod groove 22 via the brick joint opening of the carbonization chamber top brick structure. The coke oven gas is a combustible gas containing about 50% of hydrogen gas, and mixes with the outside air in the cross tie rod groove and frequently causes small explosions in the cross tie rod groove (third problem of the present invention). .

  The present invention solves this problem by filling the inside of the cross tie rod groove 22 with the granular material 18 as shown in FIG. The cross tie rod groove 22 is separated from the outside air by a lid 23 provided on the upper portion thereof. Outside air is mixed into the cross tie rod groove from the gap of the lid 23, the coke oven gas and outside air are mixed in the groove, and a small explosion occurs in the groove. In the present invention, by filling the inside of the cross tie rod groove with a granular material, even if coke oven gas is mixed into the groove and outside air is mixed, it can be prevented from causing an explosion. .

  Sand is suitably used as the granular material 18 filled in the cross tie rod groove. Brick powder may be used as the granular material. Alternatively, the mortar 19 may be placed and solidified in the lower part of the cross tie rod groove, the cross tie rod may be disposed on the upper part of the mortar, and the remaining space may be filled with the powder particles 18 (FIG. 5B). .

  When the inside of the cross tie rod groove is filled with the granular material, the thermal conductivity in the cross tie rod groove is increased as compared with the conventional example in which nothing is filled. For this reason, the temperature of the cross tie rod may increase. In the present invention, a hollow steel pipe is used as a cross tie rod, and air is allowed to flow as a cooling medium in the hollow portion of the hollow steel pipe, so that even if the inside of the cross tie rod groove is filled with powder particles, the cause of temperature rise increases. Is also preferable because the cross tie rod can be sufficiently cooled.

  Conventionally, ordinary carbon steel has been used as a material for a cross tie rod. The coke oven gas leaking into the cross tie rod groove contains S, which causes corrosion of the cross tie rod arranged in the cross tie rod groove. This point is not solved even in the present invention in which the granular material is filled in the cross tie rod groove. When the cross tie rod is corroded, the effective outer diameter of the cross tie rod is reduced, which eventually causes the cross tie rod to break (fourth problem of the present invention).

  The present invention solves the above problem by using an alloy steel pipe containing Mo as a cross tie rod. Alloy steel pipes containing Mo have corrosion resistance against S and other impurities. Therefore, even if the cross tie rod comes into contact with the coke oven gas containing S, it is possible to delay the thinning due to corrosion of the cross tie rod and increase the life of the cross tie rod. The Mo content in the alloy steel pipe is preferably 0.4% by mass or more. Thereby, while having sufficient corrosion resistance, high temperature intensity | strength is securable.

  As an alloy steel pipe containing Mo, an alloy steel pipe for a boiler / heat exchanger specified in JIS G3462 and an alloy steel pipe for piping specified in JIS G3458 are preferably used.

  Alloy steel pipes containing Mo, particularly steel pipes defined in the above JIS, are characterized by excellent corrosion resistance and superior high-temperature strength compared to ordinary carbon steel. Since the breakage of the cross tie rod occurs in the portion where the temperature rises to a high temperature, the use of a material having excellent high temperature strength can prevent the breakage of the cross tie rod, and also provides a room for reducing the cross sectional area of the cross tie rod. It will be. In the present invention, since the cross tie rod is changed from a conventional rod to a hollow steel pipe, the cross-sectional area is reduced unless the outer diameter is changed. Since the cross tie rod groove having a predetermined size is used, it is difficult to greatly increase the outer diameter of the cross tie rod. On the other hand, in the present invention using the alloy steel pipe containing Mo as the material of the cross tie rod steel pipe, it becomes possible to reduce the cross-sectional area. It is possible to design a cross tie rod having Further, in the present invention in which the cross tie rod is a hollow steel pipe and the cooling air is passed through the hollow portion, the cooling effect can be increased as the wall thickness of the cross tie rod steel pipe is thinner. By using an alloy steel pipe containing Mo having excellent high-temperature strength, there is room for reducing the thickness of the steel pipe, which is preferable for increasing the cooling effect.

  STBA12-26 are specified as the alloy steel pipe for boiler / heat exchanger specified in JIS G3462, and STPA 12-26 are specified as the alloy steel pipe for piping specified in JISG3458. As the numerical value at the end increases, the amount of alloy including Cr increases and the high-temperature strength improves. In the present invention, STBA22 and STPA22 can be preferably used in the balance between performance and cost.

The present invention was applied to a coke oven composed of a carbonization chamber 50 kiln having a carbonization chamber length of 15 m and four charging holes. An overview is shown in FIGS. The backstay 4 is disposed at a position sandwiching the combustion chamber wall structure from both sides, and the cross-tie rod 5 on the furnace top side is disposed so as to contact the flange portion at a position sandwiching a flange portion 200 mm below the top portion of the backstay 4. , Embedded in the cross tie rod groove 22 in the furnace-top brick. In the conventional example, a steel bar having a diameter of SS400 of 50 mm and a length of 16.5 m is used as the cross tie rod 5. The cross-sectional area is 19.62 cm ² .

As Example 1 of the present invention, a hollow tie rod was prepared as a cross tie rod. The material used was STPA22 defined in JISG3458, the outer diameter was 60.3 mm, the plate thickness was 12.5 mm, and the cross-sectional area was 18.76 cm ² .

  An air supply pipe (pillar pipe 11) extending in the furnace group length direction is provided at one end (extruder side) of the coke oven in the furnace length direction. The pillow tube 11 extends over the entire length in the furnace group length direction 32, and air is supplied from the air blower 16 at one end portion (coal tower side) of the pillow tube 11. The diameter of the pillow tube 11 is 300 mm, and the total length is 130 m. The branch pipe 12 branched from the pillow pipe 11 branches from a position corresponding to the backstay 4. The total number of branch pipes 12 corresponds to the total number of backstays. The branch pipe 12 further branches into two branch branch pipes 13 and supplies air from one branch pipe 12 to the two cross tie rods 5. A set of cross tie rods arranged on both sides of one carbonization chamber is made into a set, and air is supplied to the set of two cross tie rods from one branch pipe via a branch branch pipe.

  The distal end of the branch branch pipe 13 and the end of the cross tie rod 5 are connected by the flexible pipe 14 of the present invention. As the flexible pipe 14, a flexible bend pipe in which the surface of a thin stainless steel pipe was bellows processed and the surface was protected with a stainless steel net was used. As the flexible bend, one having a nominal diameter of 32 A and a length of about 800 mm was used. The connection between the branch branch tip and the flexible pipe was a flange connection. The end of the flexible pipe on the cross tie rod side was a union (male thread) and connected to a nipple connected to the inner peripheral side of the end of the cross tie rod (the end on the flexible pipe side was a female thread). Provide a height difference of about 400mm between the branch branch side end of the flexible pipe and the end of the cross tie rod, and ensure a clearance when the position between the branch branch and the cross tie rod changes relatively. Yes.

Thermocouples were installed on the surface of the cross tie rods of the conventional example and the invention example 1, and the temperature of the cross tie rods was measured. The thermocouple was installed at the position next to the riser where the cross tie rod temperature was highest. In Example 1 of the present invention, the flow rate of air flowing through the hollow tube was also measured. As a result, while the conventional example (Solid bars) temperature rose to 530 ° C., in the present invention Example 1, 360 ° C. of about at air flow rate 2.5m ³ / H, 270 ℃ in air flow rate 10 m ³ / H The temperature dropped to the extent. Therefore, for Example 1 of the present invention, the air flow rate target is set to 12 m ³ / H. In addition, although STPA22 is used as the material for the cross tie rod in Example 1 of the present invention, as far as high temperature strength is concerned, since the temperature is reduced to about 270 ° C. by air cooling, a sufficient life can be obtained even with ordinary carbon steel.

  In Example 1 of the present invention, as shown in FIG. 3A, a ball valve is provided as a flow rate adjusting mechanism 15 in the middle of the branch branch pipe 13. By adjusting the opening of the ball valve, the flow rate of air flowing in the cross tie rod can be adjusted for each branch branch pipe, that is, for each cross tie rod. In the examples, the air flow rate was adjusted as follows. The exhaust portion of the cross tie rod is exposed at the end portion on the guide wheel side (the left side in FIG. 6B is the side where air is introduced on the extruder side, and the right side is the side where air is exhausted on the guide wheel side). A surface thermometer was applied to this part, and the surface temperature of each tie rod was measured. The amount of air was adjusted so that the temperature was substantially constant. Although the adjustment temperature varies depending on summer and winter, it was adjusted at about 80 ° C. In addition to this, there is a method of measuring and adjusting the temperature of the discharged air by applying a thermometer to the exhaust flow. As a result, the thermometer installed just beside the riser pipe of the cross tie rod was stable at about 250 ° C.

  In the embodiment, the shape of the cross tie rod groove 22 is a groove having a groove width of about 90 mm and a depth of about 250 mm. When the lid 23 is installed on the surface, the space becomes a space of less than 200 mm in height. In Example 1 of the present invention, as shown in FIG. 5A, the cross tie rod groove was not filled with any filler. Next, as Example 2 of the present invention, as shown in FIG. 5 (b), powder particles were filled into the cross tie rod grooves. Specifically, below the cross tie rod groove, mortar 19 is laid in a depth range of 50 mm, and after the cross tie rod is placed in the cross tie rod groove, the remaining space of the cross tie rod is filled with sand 18; Furthermore, the lid 23 was put on. In the conventional example and the present invention example 1, during the operation of the coke oven, a small explosion sound was occasionally generated in the cross tie rod groove. However, in the present invention example 2, no small explosion sound was generated. It was. As a result, the occurrence of joint breakage of the lid 23 has been greatly reduced, so that there is no alarm at 50 ppm in the CO detector carried by the furnace operator. In addition, the cross tie rod groove was filled with powder particles, so that the cross tie rod temperature slightly increased (50 ° C to 100 ° C). Cooling was performed by flowing air into the hollow tube cross tie rod. Furthermore, the use of STPA 22 having excellent high-temperature strength as the material for the cross tie rod has no influence on the heat resistance of the cross tie rod due to the filling of the granular material.

  The technology was applied to an old coke oven that had been cut off in the top brick after 25 years of operation. Ten years after application, changes in the surfaces of the cross tie rods of the inventive examples and the comparative examples were observed. As a result, it was confirmed that the state of the cross tie rod did not show any corrosion findings or a decrease in tension due to thermal expansion, and that the furnace tightening function was maintained at the initial setting, and STPA 22 with excellent corrosion resistance was used as the cross tie rod material. The effect of having been revealed.

DESCRIPTION OF SYMBOLS 1 Coke oven 2 Coking chamber 3 Combustion chamber 4 Backstay 5 Cross tie rod 11 Pillow pipe 12 Branch pipe 13 Branch branch pipe 14 Flexible pipe 14a U curved pipe 14b 2 Eccentric curved pipe 14c Circular curved pipe 14d Swivel curved pipe 15 Flow rate adjustment mechanism 16 Air blower 17 Hollow portion of cross tie rod 18 Granule 19 Mortar 21 Furnace top brick 22 Cross tie rod groove 23 Lid 24 Rising pipe 25 Insertion port 31 Furnace length direction 32 Furnace length direction 35 Extruder side 36 Coke side side 46 Nut 47 Spring

Claims (5)

In a coke oven furnace clamping structure in which multiple back tie rods arranged in the direction of the length of the coke oven group are used to apply clamping force to the backstay, a hollow steel pipe is used as the cross tie rod, and air is supplied as a cooling medium to the hollow portion of the hollow steel pipe Because
An air supply pipe (hereinafter also referred to as a “pillow pipe”) extending in the length direction of the furnace group is arranged, and a plurality of branch pipes for branching supply air are provided in the pillow pipe, and air is supplied from each branch pipe to one or a plurality of cross tie rods. And each branch pipe and cross tie rod are connected by flexible piping ,
An alloy steel pipe containing Mo of either an alloy steel pipe for a boiler / heat exchanger specified in JIS G3462 or an alloy steel pipe for piping specified in JIS G3458 is used as the cross tie rod. Construction.   The furnace clamping structure of a coke oven according to claim 1, wherein the branch pipe has a flow rate adjusting mechanism for adjusting an air flow rate. In a coke oven furnace clamping structure in which multiple back tie rods arranged in the direction of the length of the coke oven group are used to apply clamping force to the backstay, a hollow steel pipe is used as the cross tie rod, and air is supplied as a cooling medium to the hollow portion of the hollow steel pipe Because
The furnace top brick upper has a cross tie rod groove extending in the Rochow direction, said cross tie rod is received in the cross tie rod groove, in the groove Ri Na filled with granular material,
An alloy steel pipe containing Mo of either an alloy steel pipe for a boiler / heat exchanger specified in JIS G3462 or an alloy steel pipe for piping specified in JIS G3458 is used as the cross tie rod. Construction. A cross tie rod groove extending in a furnace length direction is provided on a top brick of the furnace top brick, the cross tie rod is accommodated in the cross tie rod groove, and the groove is filled with a granular material. The coke oven furnace clamping structure according to claim 1 or 2. Claim 1, a Roshime method using a Roshime structure of coke oven according to claim 2, or claim 4, for the adjustment of the flow rate adjustment mechanism is a cross-arranged in the furnace leader direction A furnace clamping method for a coke oven, characterized in that the flow rate of air supplied to the tie rods is adjusted so as to be uniform regardless of the position in the furnace group length direction.

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