JP2017137447A - Mending method of combustion chamber of coke oven - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mending method conducting remedial work of a combustion chamber of a coke oven efficiently, shortening construction period, reducing work load, improving safety and improving durability after the mending.SOLUTION: In a mending method of a combustion chamber of a coke oven, an integral molding block molded integrally by dividing a wall 3 constructing the combustion chamber into several blocks is made previously, the integral molding block is carried in after the wall 3 is divided and carried out, the end of the integral molding block is arranged contacting with two faces provided to make right angle to the end of the existing wall 3, and the wall 3 is built newly. In a mending method of a combustion chamber of a coke oven, a concave fitting groove or a convex fitting projection is provided to one of two faces provided to the end of the wall 3 and making right angle, the convex fitting projection or the concave fitting groove to match each is provided to the end of the facing integral molding block, the concave fitting groove and the convex fitting projection fit, and the wall 3 is built newly.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a repair method that is newly constructed after dismantling a combustion chamber when repairing the combustion chamber of a coke oven.

  FIG. 1 is a vertical sectional view schematically showing a main part of a coke oven. As shown in FIG. 1, a coke oven generally has a carbonization chamber 2 for dry distillation of coal, a wall body 3 having a combustion chamber for burning fuel gas, and fuel gas and combustion air using residual heat of combustion exhaust gas. The heat accumulating chamber 4 is used for preheating, and the wall 3 and the carbonizing chamber 2 of the combustion chamber are alternately arranged. The wall body 3 shown in FIG. 1 has a structure as shown in FIG. 4, and the combustion chamber 1 is formed inside the wall body 3 on which refractory bricks are stacked.

  During the operation of the coke oven, coal is charged into the carbonization chamber 2 and further subjected to dry distillation by the combustion heat generated in the combustion chamber 1, and then the obtained coke is discharged from the carbonization chamber 2 repeatedly. As a result, the wall 3 formed of refractory bricks is worn out, and there arises a problem that combustion exhaust gas and unburned fuel gas leak out from the combustion chamber 1 into the carbonization chamber 2.

Therefore, the combustion chamber 1 must be repaired as appropriate. However, if the combustion chamber 1 and the carbonization chamber 2 of the coke oven are all stopped and repaired, coke production is hindered. Therefore, while operating the coke oven, only the combustion chamber 1 to be repaired is stopped for repair. The repair procedure is as follows:
(A) The combustion chamber 1 to be repaired is dismantled and taken out of the furnace,
after that,
(B) It is roughly divided into a two-stage process of newly constructing the combustion chamber 1.

  Conventionally, in the process (B), an operator builds the combustion chamber 1 by stacking refractory bricks one by one in the furnace. However, since refractory bricks are manually stacked, it takes a very long time. Moreover, since the working environment is high temperature, equipment for ensuring the safety of workers is required, which causes an increase in construction costs.

  Therefore, in the repair of the combustion chamber 1, a refractory brick assembly (hereinafter referred to as a brick assembly block) obtained by stacking refractory bricks into a predetermined shape (for example, see FIG. 4) is preliminarily stored in a ground place outside the furnace. Repair work for building the combustion chamber 1 by bringing the brick aggregate block into the furnace in the process (B) and making the combustion chamber 1 is becoming widespread (see Patent Documents 1 and 2). By using the brick aggregate block, it is possible to efficiently perform repair work and shorten the construction period. In addition, the load on the worker is reduced and the safety is improved.

  However, the brick aggregate block is obtained by stacking refractory bricks, and further joining and fixing the refractory bricks with a fixing material (for example, mortar). Therefore, the brick assembly block is easily damaged or the brick is easily dropped during the transport and assembly of the brick assembly block. In addition, after repairs are completed and operations are started, cracks occur in the joints of refractory bricks (so-called joints) and refractory bricks due to the difference in thermal expansion between the refractory bricks and the fixing material, or brick aggregates Problems such as block deformation are likely to occur.

Therefore, in order to reduce joints made of fixing materials, a technique for forming a small block (having a height of about 300 mm) by pouring a kneaded refractory into a mold larger than the refractory brick has been studied. However, when repair work is performed using the small block, the effect of reducing joints cannot be sufficiently obtained because the dimensions are small. Furthermore, since silica (SiO ₂ ) used as a kneaded refractory has an amorphous content of about 90% by mass and a crystallization component of about 10% by mass, it cannot suppress the thermal expansion that occurs during the operation of the coke oven. Thermal expansion of ~ 0.4% occurs. Therefore, problems such as cracks in joints and small blocks, or deformation of the small blocks are likely to occur.

Japanese Patent Laid-Open No. 2001-19968 Japanese Patent Laid-Open No. 2001-19969

  The present invention eliminates the problems of the prior art, enables efficient repair work of the combustion chamber of the coke oven, and consequently shortens the work period, reduces the work load, and improves safety, An object of the present invention is to provide a repair method capable of improving the durability after repair.

  The inventor efficiently performs repair work, shortening the work period, reducing the work load, and improving the safety, the brick assembly block is effective, so cracks generated in the brick assembly block, We examined the technology to prevent deformation and damage. And, as a result of research focusing on the fact that the brick assembly block is made of two types of materials (ie, refractory bricks and fixing materials), it causes cracks, deformations, and breakage. It has been found that if a block having the same shape is formed of a single material, the joints (so-called joints) of the refractory bricks can be reduced, and cracks, deformations and damages can be prevented. That is, a block integrally formed of a single material (hereinafter referred to as an integrally formed block) can prevent cracks, deformation, and breakage at joints.

The present invention has been made based on such knowledge.
That is, according to the present invention, in a repair method for repairing a combustion chamber of a coke oven, an integrally formed block in which a wall body forming the combustion chamber is divided into a plurality of blocks and formed integrally with a heat resistant material is manufactured in advance. After disassembling the wall body and carrying it out of the furnace, it carries in the integrally formed block and abuts the end of the integrally formed block on the two surfaces provided to make a right angle to the end of the existing wall This is a method for repairing the combustion chamber of the coke oven, in which a wall is newly constructed.

  In the repairing method of the present invention, a concave fitting groove is provided on one of the two perpendicular surfaces provided at the end of the wall, and the end of the integrally molded block facing the concave fitting groove. It is preferable to provide a convex fitting protrusion and fit the concave fitting groove and the convex fitting protrusion together. Alternatively, a convex fitting projection is provided on one of the two perpendicular surfaces provided at the end of the wall, and the concave fitting groove is formed at the end of the integrally molded block facing the convex fitting projection. It is preferable to fit the convex fitting protrusion and the concave fitting groove.

  According to the present invention, it is possible to efficiently perform the repair work of the combustion chamber of the coke oven, thereby shortening the work period, reducing the work load, improving the safety, and improving the durability after the repair. Since it can be increased, it has a remarkable industrial effect.

It is a vertical sectional view showing the principal part of a coke oven typically. FIG. 2 is a vertical sectional view schematically showing an example in which the wall body in FIG. 1 is disassembled and carried out of the furnace. It is a vertical sectional view which shows typically the example which built the wall of the combustion chamber using the integral formation block. It is a top view which shows the example of a brick aggregate block typically. It is a top view which shows the example of an integrally molded block typically. It is a top view which shows typically the example which combined the integrally molded block of FIG. It is a side view which shows the example of the wall body piled up in the staggered arrangement | sequence of the combination of FIG. It is a perspective view which shows the other example of an integrally molded block typically.

  FIG. 2 is a vertical sectional view schematically showing an example in which the wall body 3 of FIG. 1 is disassembled and carried out of the furnace, and FIG. 3 is an example in which the wall body of the combustion chamber is constructed using the integrally formed block 5. It is a vertical sectional view showing typically.

The integrally formed block 5 for the wall 3 contains 96 to 99% by mass of fused silica (purity 99% by mass or more) as a heat-resistant material and 2.5 to 3.5% by mass of a binder (phosphate and / or calcium oxide), A mixture of impurities inevitably mixed in the remainder (hereinafter referred to as unavoidable impurities) is poured into a mold, subjected to natural drying and forced drying, and a temperature of 900 to 1100 ° C. at a heating rate of 10 to 25 ° C./hour. The temperature is raised to the range, and further maintained for 24 hours or more, and then naturally cooled to room temperature, thereby being integrally molded. In the following, fused silica refers to silica (SiO ₂ ) with an amorphous content of 95% by mass or more. Further, natural drying means drying in the air at normal temperature, and forced drying means drying while heating.

  The integrally formed block 5 for the wall 3 manufactured in this way has an extremely small coefficient of thermal expansion of 0.01 to 0.20%, a cold compressive strength of 30 MPa or more, and a load softening point of 1400 ° C. or more (usually 1500 to 1600 ° C) and sufficient strength, so that cracks and deformation do not occur and it has excellent durability. Moreover, a large integrally formed block 5 having a height exceeding 300 mm can be manufactured.

  Further, if the weight of the single integrally formed block 5 for the wall body 3 is too small, the number of times of carrying into the furnace increases, so that the efficiency of repair work for the combustion chamber decreases. On the other hand, if the weight is too large, it takes a long time to carry it into the furnace, so that the efficiency of repair work for the combustion chamber is reduced. Therefore, the weight of one unitary molded block 5 for the wall is preferably in the range of 300 to 3000 kg / piece.

  Then, the integrally formed blocks 5 are carried into the furnace, a plurality of integrally formed blocks 5 are stacked in the height direction (see FIG. 3), and the plurality of integrally formed blocks 5 are also arranged in the depth direction. Two surfaces 6 (hereinafter referred to as block joint surfaces) are provided at the end of the integrally formed block 5 so as to form a right angle. When the integrally formed blocks 5 are arranged in the depth direction, the integrally formed block 5 The other end of each is brought into contact with the block joining surface 6 and sequentially arranged.

  In this way, by arranging the end of the integrally formed block 5 in contact with the block joining surface 6 of the existing wall 3, the integrally formed block 5 is firmly joined to construct the wall 3. It becomes possible. Since the integrally formed block 5 is unlikely to be cracked or deformed originally, if the wall body 3 is constructed using the block joint surface 6, the effect of further improving the durability of the wall body 3 after restarting operation can be obtained. can get.

  Here, the end of the existing wall is the end of the part that is left in the furnace without being dismantled after dismantling the range to be repaired in the step (A), and (B) This means the end of the part newly constructed using the integrally formed block in the step.

  A convex protrusion 7 (hereinafter referred to as a convex fitting protrusion) is provided on one of the two block joint surfaces 6 provided at the end of the integrally formed block 5, and a concave shape is formed at the other end of the integrally formed block 5. Groove 8 (hereinafter referred to as a concave fitting groove) (see FIG. 5), the convex fitting projection 7 and the concave fitting groove 8 are fitted to each other, and the integrally formed block 5 is arranged (see FIG. 6). It is preferable because the effect of strong bonding is further improved.

  Or although illustration is abbreviate | omitted, the concave fitting groove | channel 8 may be provided in one side of the block joint surfaces 6 of the integral molding block 5, and the convex fitting protrusion 7 may be provided in the other edge part of the integral molding block 5. A similar effect can be obtained.

  The block joint surface 6, the convex fitting protrusion 7, and the concave fitting groove 8 can be formed by scraping the end of an existing wall body in the furnace or by manually stacking refractory bricks. Alternatively, when the integrally formed block 5 is manufactured by pouring the material of the integrally formed block 5 into the mold, the block joint surface 6 may be formed.

  Further, when the integrally formed blocks 5 are stacked in the longitudinal direction, the positions of the joint surfaces 6 of the upper and lower integrally formed blocks 5 are shifted to form a staggered arrangement as shown in FIG. Strength can be improved.

  In FIG. 7, the horizontal ridge 9 and the charring hole 10 formed above the wall 3 constructed by stacking the integrally formed blocks 5 are shown together. These horizontal canals 9 and charring holes 10 can also be formed using integral molding blocks (see FIG. 8). Since the composition and firing conditions are the same as those of the integrally formed block 5 for the wall body 3 described above, description thereof is omitted. FIG. 8A shows an example of an integrally formed block for the horizontal canal 9, and FIG. 8B shows an example of an integrally formed block for the charring hole 10.

  As shown in FIG. 2, after the wall of one combustion chamber of a coke oven (furnace height 6 m, furnace length 34 flue) is dismantled and carried out of the furnace (step (A) above), as shown in FIG. In addition, the body forming blocks were stacked and arranged in the depth direction to construct the wall body.

  The integrally molded block used (weight 2200kg / piece) is a mixture containing 99.5% by mass of fused silica: 96.0% by mass, binder consisting of phosphate and calcium oxide: 3.0% by mass, the balance being inevitable impurities Poured into a mold, air dried for 72 hours, forced to dry at 150 ° C for 72 hours, then heated to 1020 ° C at a rate of temperature increase of 20.0 ° C / hour, held for another 48 hours, and then naturally cooled to room temperature. By doing so, it is molded integrally. This is an invention example.

  On the other hand, after dismantling all the wall bodies and carrying them out of the furnace (step (A) above), workers built up the refractory bricks and rebuilt the wall bodies (step (B) above). It was. This is a conventional example.

  When the number of days required for the process (B) was compared between the invention example and the conventional example, the required number M of the invention example was about 1/2 of the required number N of the conventional example. .

  Furthermore, in the example of the invention, after repair work was completed, when the operation was started again and six months had passed, the inside of the furnace was inspected from the inspection hole, and no crack, deformation, or breakage of the integrally formed block was observed.

DESCRIPTION OF SYMBOLS 1 Combustion chamber 2 Carbonization chamber 3 Wall body 4 Thermal storage chamber 5 Integrated molding block 6 Block joint surface 7 Convex fitting protrusion 8 Concave fitting groove 9 Horizontal tunnel
10 Charging hole

Claims (3)

  In the repairing method for repairing the combustion chamber of the coke oven, an integrally formed block in which the wall body forming the combustion chamber is divided into a plurality of blocks and integrally molded with a heat-resistant material is manufactured in advance, and the wall body Is dismantled and carried out of the furnace, and then the integrally formed block is carried in, and the end portions of the integrally formed block are brought into contact with two surfaces provided so as to be perpendicular to the end portions of the existing wall body. A method for repairing a combustion chamber of a coke oven, wherein the wall body is newly constructed.   A concave fitting groove is provided on one of the two perpendicular surfaces provided at the end of the wall body, and a convex fitting projection is provided at the end of the integral molding block facing the concave fitting groove. The method for repairing a combustion chamber of a coke oven according to claim 1, wherein the wall body is newly constructed by fitting and fitting the concave fitting groove and the convex fitting protrusion.   A convex fitting projection is provided on one of the two perpendicular surfaces provided at the end of the wall, and a concave fitting groove is formed at the end of the integral molding block facing the convex fitting projection. 2. The method for repairing a combustion chamber of a coke oven according to claim 1, wherein the wall body is newly constructed by fitting the convex fitting protrusion and the concave fitting groove.

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