JP2019035024A - Integral molding bricks for repairing a combustion chamber of a coke oven and a method for repairing using the same - Google Patents

Abstract

To provide integral molding bricks and a method for repairing using the same, wherein the integral molding bricks can enable efficient repair work of a combustion chamber of a coke oven, thereby can shorten a construction period, reduce a work load, improve safety, and further, can improve durability after repairing.SOLUTION: The integral molding bricks used have an outer shape with a length L of 900 to 1830 mm (i.e. 2 to 4 flues), a width W of 900 to 1000 mm and a height H of 260 to 540 mm (i.e. 2 to 4 steps), and a combustion chamber and a gas hole are of substantially the same shape as a repair part.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an integrally formed brick that can be suitably used in repair work for a combustion chamber of a coke oven, and a repair method for performing repair work using the integrally formed brick.

  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. 5, 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.

  In addition, a strength member (hereinafter referred to as a column) that supports the heat storage chamber 4 and a heat storage body that accumulates heat between the columns to store heat are also formed of refractory bricks, and deteriorates over time. Damage (for example, deformation, cracks, defects, etc.) or clogging occurs. If the column body or the heat storage body is damaged or clogged, the flow of fuel gas or combustion air is partially obstructed, resulting in a large variation in the temperature distribution of the wall body, which causes deterioration of coke quality. In addition, the amount of heat stored is reduced, and the amount of fuel gas used is increased.

Therefore, the combustion chamber 1 and the heat storage chamber 4 must be repaired as appropriate. However, if all the combustion chamber 1 and the carbonization chamber 2 of the coke oven are stopped and repaired, the production of coke will be 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 and the heat storage chamber 4 to be repaired are dismantled and taken out of the furnace.
after that,
(B) It is roughly divided into a two-stage process in which a combustion chamber 1 and a heat storage chamber 4 are newly constructed.

  Conventionally, in the process (B), an operator builds the combustion chamber 1 and the heat storage chamber 4 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.

  In the conventional technique, after the repair of the combustion chamber 1 is completed, the refractory brick at the end of the heat storage chamber is removed, and an operator enters the room to replace the heat storage body. However, since the work place is narrow and the temperature is higher than 50 ° C., the work efficiency is very poor and it is not preferable for safety. In addition, due to the structure of the heat storage chamber 4, there is a coke oven in which an operator cannot enter from the end and cannot be repaired.

  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. 5) is preliminarily stored in a ground 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 Document 1). 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.

  Further, in the repair of the heat storage chamber 4, a repair technique for filling a damaged portion of the refractory brick with a repair material has been developed (see Patent Document 2). However, when the crack generated in the refractory brick is deep, it is difficult to allow the repair material to penetrate to the deep part, and thus it is difficult to sufficiently repair the crack. When a defect of the refractory brick occurs over a wide range, it takes a long time to fill the defect with a repair material. Therefore, if the brick assembly block is used in repairing the heat storage chamber 4, it is possible to expect a shortening of the construction period, reduction of work load, and improvement of safety.

  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, when the brick assembly block is transported during repair and further assembled, the brick assembly block is likely to break or fall off, and after the repair is completed and the operation is started, the heat of the refractory brick and the fixing material Due to the difference in the amount of expansion, problems such as cracks in the joints of refractory bricks (so-called joints) and refractory bricks, or deformation of the brick aggregate block are likely to occur.

Japanese Patent Laid-Open No. 2001-19969 Japanese Patent Laid-Open No. 10-219252

  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 an integrally formed brick capable of enhancing the durability after repair, and a repair method using the same.

Since the brick assembly block is effective for efficiently carrying out repair work, shortening the work period, reducing the work load, and improving safety, cracks generated in the brick assembly block The technology to prevent deformation was studied. And the result of research focusing on the fact that the brick aggregate block is made up of two types of materials, that is, a refractory brick having a predetermined shape and an adhering material that bonds the refractory brick to cause cracks and deformation. It has been found that cracks and deformation can be prevented if a shape similar to that of a conventional brick aggregate block is formed from a single material (that is, only a large refractory brick without using a fixing material). In other words, bricks (hereinafter referred to as integrally formed bricks) obtained by pouring powder of refractory material (for example, SiO ₂ ), which is the main raw material, into a mold, press-molding, and firing are the total thermal expansion Since it is uniform, cracks and deformation can be prevented.

The present invention has been made based on such knowledge.
That is, the present invention is an integrally formed brick for repairing a combustion chamber of a coke oven, having a length L of 900 to 1830 mm (ie, 2 to 4 flue), a width W of 900 to 1000 mm, and a height H of 260 to It is an integrally formed brick having an outer shape of 540 mm (that is, 2 to 4 steps), and the combustion chamber and the gas hole being substantially equivalent to the shape of the repaired portion.

  The present invention also relates to a repair method for repairing a combustion chamber and a heat storage chamber of a coke oven, in which a length L is 900 to 1830 mm (that is, 2 to 4 flue), a width W is 900 to 1000 mm, and a height H is 260 to 540 mm ( In other words, an integrally formed brick that has an outer shape of 2 to 4 steps), and the combustion chamber and gas holes are integrally formed in a shape that is substantially the same as the shape of the repaired portion, is manufactured in advance, and the wall body is disassembled. This is a method for repairing a coke oven in which an integrally formed brick is carried in and then a new wall body is constructed after being carried out of the furnace.

  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 a wall body and a heat storage chamber in FIG. 1 are disassembled and carried out of the furnace. It is a vertical sectional view showing typically an example where a heat storage room was newly constructed. It is a vertical sectional view which shows typically the example which built the wall of the combustion chamber using the integrally formed brick. It is a top view which shows typically the example of the brick aggregate block of a combustion chamber wall. It is a perspective view which shows typically the example of the integrally formed brick of a combustion chamber wall.

  FIG. 2 is a vertical sectional view schematically showing an example in which the wall body 3 and the heat storage chamber 4 of FIG. 1 are disassembled and carried out of the furnace. Reference numeral 4a in FIG. 2 denotes a refractory brick column that supports the heat storage chamber 4, and reference numeral 4b denotes a refractory brick heat storage body that is stacked between the pillars 4a to store heat.

FIG. 3 is a vertical sectional view schematically showing an example in which a heat storage chamber is newly constructed in the space of FIG. Then, as shown in FIG. 4, the integrally formed bricks 7 are stacked to construct the wall body 3 of the combustion chamber 1. FIG. 6 is a perspective view schematically showing an example of the integrally formed brick 7 for the wall 3.
The integrally formed brick 7 for the wall body 3 is formed integrally by filling a raw material powder into a mold, press-molding it, and firing it.

Moreover, since the frequency | count of carrying in in a furnace will increase if the weight for one piece of the integrally-molded brick 7 is too small, the efficiency of repair construction of a combustion chamber will fall. 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 integrally formed brick 7 has a length L of 900 to 1830 mm (that is, 2 to 4 flue), a width W of 900 to 1000 mm, and a height H of 260 to 540 mm (that is, 2 to 4 steps), and The combustion chamber and the gas hole are integrally formed bricks that have almost the same shape as the repaired portion.
By doing so, the weight of the integrally formed brick 7 is approximately in the range of 300 to 3000 kg / piece, and it is possible to prevent a reduction in the efficiency of repair work for the combustion chamber.

  As shown in Fig. 2, the wall of one combustion chamber of the coke oven (furnace height 6m, furnace length 34 flues), the column of the heat storage chamber below it, and the heat storage bodies on both sides are dismantled and carried out of the furnace. After the step (A), a heat storage chamber was newly constructed as shown in FIG.

Next, as shown in FIG. 4, a wall for the combustion chamber was newly constructed by stacking integrally formed bricks for the wall in the upper space of the heat storage chamber. The integrally formed brick (weight 500 kg / piece) used had a length L of 1377 mm (ie, 3 flue), a width W of 918 to 924 mm, and a height H of 400 mm (ie, 3 steps).
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. In addition, after the accumulation of the wall of the combustion chamber was completed, the heat storage chamber removed the refractory brick at the end of the heat storage chamber, and an operator entered the room to replace the heat storage body.
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 or deformation of the integrally formed block was found.

1 Combustion chamber 2 Carbonization chamber 3 Wall body 4 Heat storage chamber
4a Column
4b Thermal storage 5 Newly constructed pillar 6 Newly constructed thermal storage 7 Integrated brick for wall

Claims (2)

  An integrally formed brick for repairing a combustion chamber of a coke oven, having an outer shape with a length L of 900 to 1830 mm, a width W of 900 to 1000 mm, and a height H of 260 to 540 mm, and the combustion chamber and A monolithic brick characterized in that the gas holes are almost the same as the shape of the repaired part.   In a repair method for repairing a combustion chamber and a heat storage chamber of a coke oven, the length L is 900 to 1830 mm, the width W is 900 to 1000 mm, the height H is 260 to 540 mm, and the combustion chamber and the gas hole Pre-manufactured an integrally formed brick that is integrally molded into a shape that is approximately the same as the shape of the repaired part, dismantle the wall body and carry it out of the furnace, and then carry in the newly formed brick. The method for repairing a coke oven is characterized in that the wall is constructed.

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