JP3213337U - Forming block that forms horizontal tunnel of coke oven - Google Patents

Abstract

[PROBLEMS] It is possible to efficiently perform a work for forming a horizontal tunnel of a coke oven, thereby shortening the work period, reducing the work load, improving safety, and improving durability after operation. A molding block is provided. A lower block 3 forming a lower part of a horizontal tunnel and an upper block 4 forming an upper part of the horizontal tunnel, the lower block 3 has a length of 1300 to 2300 mm, a width of 600 to 1200 mm, and a height of 310 to 300 mm. It has a U-shape of 480 mm and a thickness of 150 to 210 mm, and has a gas flow hole 5 that communicates with the combustion chamber of the coke oven in the bottom floor and serves as a gas passage, and the upper block 4 has a length of 1300 to 2300 mm It has an inverted U-shape having a width of 600 to 1200 mm, a height of 400 to 800 mm, and a thickness of 150 to 210 mm, and has an inspection hole 6 in the ceiling. [Selection] Figure 1

Description

  The present invention relates to a forming block for forming a horizontal tunnel of a coke oven.

  The coke oven horizontal tunnel is formed by stacking refractory bricks while bonding them with a fixing material (for example, mortar). Construction of a new coke oven or repair of an existing coke oven is performed. The work of stacking and joining a large number of refractory bricks at the site requires a lot of time. In particular, in the case of repair work for an existing coke oven, the work environment is high, and thus equipment for ensuring the safety of workers is required, leading to an increase in construction costs.

  Therefore, refractory brick aggregates (hereinafter referred to as brick aggregate blocks) formed by stacking refractory bricks into a predetermined shape are pre-manufactured at the assembly ground outside the furnace, and the brick aggregates are prepared according to the progress of construction. A technique has been developed in which a body block is carried into a construction site to perform construction (see Patent Document 1).

  When this technique is applied to form a horizontal tunnel, the use of a brick aggregate block as shown in FIG. 4 makes it possible to perform the work efficiently and shorten the construction period. In addition, the load on the worker is reduced and the safety is improved.

  However, since the brick aggregate block (see FIG. 4) is constructed by stacking the fire bricks 1 and further joining the fire bricks 1 with a fixing material, after the construction is completed and the operation is started, the fire bricks 1 are fixed. Due to the difference in the amount of thermal expansion of the materials, problems such as cracks in the joints (so-called joints) of the refractory bricks 1 and refractory bricks, or deformation of the brick aggregate block 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 the horizontal ridge is formed 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

  The present invention eliminates the problems of the conventional technology and enables efficient construction of the coke oven horizontal tunnel, which in turn shortens the construction period, reduces the workload, and improves safety. And it aims at providing the shaping | molding block which can improve the durability after operating.

  The inventor performs the work to form the horizontal tunnel efficiently, and the brick aggregate block is effective for shortening the construction period, reducing the work load, and improving the safety. The technology to prevent cracks and deformations in the block was studied. 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 cracks, deformation and breakage can be prevented by molding a block having the same shape with a single material.

  In other words, a block made of silica (amorphous: 95% by mass or more) and a binder, and cast by pouring the mixture into a mold (hereinafter referred to as a molding block) has an overall thermal expansion amount. Since it is 0.04% or less, it is possible to prevent cracks, deformation and breakage. Moreover, it is possible to produce a large molding block whose height exceeds 300 mm.

The present invention has been made based on such knowledge.
That is, the present invention is a forming block for forming a horizontal corridor of a coke oven, comprising a lower block that forms the lower part of the horizontal corridor and an upper block that forms the upper part of the horizontal corridor. Gas flow that is U-shaped with a length of 1300-2300mm, a width of 600-1200mm, a height of 310-480mm, and a thickness of 150-210mm, and that communicates with the combustion chamber of the coke oven on the bottom floor to serve as a gas passage It is a molded block that has a hole, an upper block that has an inverted U shape with a length of 1300 to 2300 mm, a width of 600 to 1200 mm, a height of 400 to 800 mm, and a thickness of 150 to 210 mm, and an inspection hole in the ceiling. .

  In the molded block of the present invention, it is preferable that the lower block and the upper block are both made of silica having an amorphous content of 95% by mass or more (hereinafter referred to as fused silica).

  According to the present invention, it is possible to efficiently perform the work for forming the horizontal corridor of the coke oven, thereby shortening the construction period, reducing the work load, and improving the safety. Since it can improve the property, it has a remarkable industrial effect.

It is a perspective view which shows typically the example of the shaping | molding block of this invention. It is explanatory drawing which shows the example of a lower block typically. It is explanatory drawing which shows the example of an upper block typically. It is a perspective view which shows typically the example of the conventional brick aggregate block.

  FIG. 1 is a perspective view schematically showing an example of a molding block of the present invention. The molding block 2 includes a lower block 3 that forms the lower part of the horizontal tunnel and an upper block 4 that forms the upper part of the horizontal tunnel. As shown in FIG. 1, the lower block 3 and the upper block 4 are combined to form a horizontal block. Form a tunnel.

First, the lower block 3 will be described.
The lower block 3 is manufactured by pouring a mixed material of fused silica and a binder into a mold having a predetermined shape. The shape of the lower block 3 is determined according to the design specification of the horizontal tunnel for each coke oven, and an example is shown in FIG. 2A is a plan view, FIG. 2B is a front view, and FIG. 2C is a cross-sectional view taken along the line AA in FIG.

  The lower block 3 has a U-shape and has a gas flow hole 5 in its bottom floor. The gas flow hole 5 is disposed so as to communicate with the combustion chamber of the coke oven, and serves as a gas passage from the combustion chamber to the horizontal tunnel.

If the lower block 3 is too large, not only will it be difficult to manufacture, but it will also be difficult to transport it to the construction site. In addition, after the construction is completed, the coke oven is operated and exposed to high temperatures, so that cracks and deformation easily occur. On the other hand, if the lower block 3 is too small, the number of times of stacking at the construction site cannot be reduced sufficiently, so that the effects of shortening the construction period, reducing the work load, and improving the safety are impaired. Further, since the joint cannot be reduced sufficiently, the joint is cracked after the operation, and the effect of improving the durability becomes poor. Therefore, the dimensions of the lower block 3 are preferably in the ranges of length L _B : 1300 to 2300 mm, width W _B : 600 to 1200 mm, height H _B : 310 to 480 mm, and thickness T _B : 150 to 210 mm.

Next, the upper block 4 will be described.
The upper block 4 is manufactured by pouring a mixed material of fused silica and a binder into a mold having a predetermined shape. The shape of the upper block 4 is determined according to the design specifications of the horizontal tunnel for each coke oven, an example of which is shown in FIG. 3A is a plan view, FIG. 3B is a front view, and FIG. 3C is a cross-sectional view taken along the line BB in FIG.

  The upper block 4 has an inverted U shape and has an inspection hole 6 in the ceiling. The inspection hole 6 is for confirming the combustion state of the combustion chamber.

If the upper block 4 is too large, not only will it be difficult to manufacture, but it will also be difficult to transport it to the construction site. In addition, after the construction is completed, the coke oven is operated and exposed to high temperatures, so that cracks and deformation easily occur. On the other hand, if the upper block 4 is too small, the number of times of stacking at the construction site cannot be reduced sufficiently, so that the effects of shortening the construction period, reducing the work load, and improving the safety are impaired. Further, since the joint cannot be reduced sufficiently, the joint is cracked after the operation, and the effect of improving the durability becomes poor. Therefore, the dimensions of the upper block 4 are preferably in the ranges of length L _U : 1300 to 2300 mm, width W _U : 600 to 1200 mm, height H _U : 400 to 800 mm, and thickness T _U : 150 to 210 mm.

  Note that when the lower block 3 and the upper block 4 are manufactured, a molded block having a large size as described above can be obtained by using fused silica having an amorphous content of 95% by mass or more. Moreover, it has sufficient strength such as cold compressive strength of 30MPa or more, load softening point of 1500 ° C or more, and thermal expansion can be suppressed to 0.04% or less, so deformation, cracks and breakage during operation It can be prevented from occurring.

  In the repair work of the coke oven (furnace height 6m, furnace length 34 flue), after dismantling the horizontal tunnel and carrying it out of the furnace, as shown in FIG. 1, the forming block 2 (ie, the upper block 4 and the lower block 3 ) To form a horizontal tunnel.

Lower block 3 (length L _B : 1816 mm, width W _B : 925 mm, height H _B : 381 mm, thickness T _B : 182 mm) and upper block 4 (length L _U : 1816 mm, width W _U : 925 mm) , Height H _U : 605mm, thickness T _U : 182mm) contains 98.4% by mass of fused silica: 97.6% by mass, binder consisting of phosphate and calcium oxide: 2.3% by mass, the remainder is inevitable By pouring the mixture of impurities into the mold, raising the temperature to 1120 ° C at a heating rate of 17.7 ° C / hour, holding for another 27 hours, and then cooling to room temperature at a cooling rate of 17.1 ° C / hour, Molded. This is an example of the present invention.

  On the other hand, conventionally, in the repair work of the coke oven, after dismantling all the horizontal canals and carrying them out of the furnace, the workers pile up refractory bricks to form the horizontal canals. This is a conventional example.

  When the number of days required for forming the horizontal canal was compared between the inventive example and the conventional example, the required number M of the inventive example was about 1/2 of the required number N of the conventional example. .

  Further, in the inventive example, after the 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 cracks, deformations, or damages were found in the molding block.

DESCRIPTION OF SYMBOLS 1 Refractory brick 2 Molding block 3 Lower block 4 Upper block 5 Gas distribution hole 6 Inspection hole

Claims (2)

  A forming block for forming a horizontal tunnel of a coke oven, comprising a lower block forming a lower part of the horizontal tunnel and an upper block forming an upper part of the horizontal tunnel, the lower block having a length 1300-2300mm, width 600-1200mm, height 310-480mm, U-shaped 150-210mm thickness, and gas flow hole that communicates with the combustion chamber of the coke oven at the bottom floor and serves as a gas passage The upper block has an inverted U-shape having a length of 1300 to 2300 mm, a width of 600 to 1200 mm, a height of 400 to 800 mm, and a thickness of 150 to 210 mm, and has an inspection hole in the ceiling. To form blocks.   The molding block according to claim 1, wherein each of the lower block and the upper block is made of fused silica having an amorphous content of 95% by mass or more.

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