JP2011068733A - Repairing material for oven wall of coke oven carbonization chamber and method of repairing the wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a repairing material for an oven wall of a coke oven carbonization chamber that improves: a fill factor (fill depth into an inside of a crack) of the repairing material to fill, by blowing, a joint break or a crack failure generated in the oven wall of the coke oven carbonization chamber which partitions a combustion chamber and the carbonization chamber; and sealability (airtightness), as well as to provide a method of repairing the wall. <P>SOLUTION: This repairing material includes a ≥50% silica fine powder as a main component and has no sintering promoter except a metal, wherein preferably ≤1% Si or Al or those mixture is added as the metal having reactive sintering behavior. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a repair material and a repair method for a furnace wall of a coke oven, and in particular, from the carbonization chamber side, damage parts such as joint breaks and cracks generated in the carbonization chamber of the chamber-type coke oven and the partition wall of the combustion chamber. The present invention relates to a repair material and a repair method for a coke oven carbonization wall to be repaired.

  The coke oven 1 is a facility in which a carbonization chamber 2 into which coal is charged and a combustion chamber 3 for burning gas are alternately arranged. The carbonization chamber 2 and the combustion chamber 3 are partitioned by partition walls 4 as shown in FIG. It has been. Coal is input from an inlet 6 provided at the top 5 of the carbonization chamber 2, heated from the combustion chamber 3 via the partition wall 4, and dry-distilled into coke. The coke oven gas generated at this time is recovered and used effectively. The produced coke opens the furnace lid provided on the side surface of the carbonization chamber 2 and is extruded from one side by an extruder, collected in the digester on the opposite side, cooled in a wet or dry manner, and used in a blast furnace or the like. . Thereafter, the furnace lid is closed, and coal is again charged from the top 5 to produce coke repeatedly.

  The coking chamber is cooled rapidly when coke is pushed out or when coal is charged, so that the bricks that make up the furnace wall are exposed to severe temperature changes, resulting in breaks in the bricks and cracks in the bricks. There are many things. If the carbonization chamber and the combustion chamber of the coke oven communicate with each other due to breakage of the furnace wall bricks or cracks in the brick, the coke oven gas generated by the dry distillation of coal in the carbonization chamber passes through the damaged portion and the combustion chamber. This causes problems such as incomplete combustion and soot and black smoke.

  Therefore, in order to repair these damages, the internal pressure of the carbonizing chamber to be repaired is set higher than that of the adjacent combustion chamber, and a repair material is blown into the carbonizing chamber together with compressed air, and the carbonizing chamber is cut through joints and cracks. A repairing method called a dusting repairing method or a dry seal repairing method in which a repair material is filled in a damaged portion and closed by being put on an airflow flowing from the combustion chamber to the combustion chamber is employed.

  As an example, in Japanese Patent Application Laid-Open No. 11-335668, when a repair material is blown into the carbonization chamber, two kinds of repair materials having different particle sizes are used, and a repair material containing 40% or more of particles of 74 μm or more is first blown. Subsequently, a method of blowing a repair material containing 80% or more of particles having a particle size of 44 μm or less is disclosed.

  Further, in the method of Japanese Patent Laid-Open No. 11-335668, since the floating state of the repair material is hardly obtained, many repair materials fall to the coke oven furnace bottom, and there is a problem in the repair work efficiency. In order to ensure the conditions for the particles to float in Japanese Patent No. 4175143, a coke oven carbonization chamber wall characterized by using fly ash, silica fume, or shirasu balloon having an average particle size of Stokes diameter by a wind sieve method of 30 μm or less. A repair method is disclosed.

JP-A-11-335668 Japanese Patent No. 4175143

  However, the method disclosed in Japanese Patent Application Laid-Open No. 11-335668 has an excellent effect on the filling of the repair material into the damaged part, but the sinterability of the repair material filled in the coke oven partition is low. The sealing property (air tightness) and durability of the repair material itself are still not sufficient.

  On the other hand, in other conventional techniques, the one in which the sintering temperature is adjusted to about 600 to 900 ° C. using a material in which the sintering accelerator is added or the repair material itself is easily sintered is generally used. In addition to insufficient floating conditions, it was confirmed by experiments by the inventors that the repair material does not agglomerate (or sinter) and fill into the interior when cracks or joints with narrow openings come into contact with each other at the entrance. .

  Therefore, the filling rate (filling depth into the crack) of the repair material to be filled by blowing into the damaged part of the joint cut or crack generated in the furnace wall in the carbonization chamber of the coke oven that partitions the combustion chamber and the carbonization chamber. The problem was a repair material and a repair method for coke oven carbonization chamber walls that would improve the sealing performance (air tightness) as well as improving the sealing performance.

  In order to solve the above-mentioned problems, the present invention, in order to solve the above-described problem, carbonizes while maintaining the pressure inside the carbonizing chamber of the coke oven that partitions the combustion chamber and the carbonizing chamber at a higher pressure than the combustion chamber. A repair material for a coke oven carbonization chamber wall in which a repair material is blown and filled into a damaged portion of a joint or crack generated in an indoor furnace wall, and the repair material contains silica-based fine powder as a main component of 50% or more. The present invention provides a coke oven carbonization chamber wall repair material characterized in that it does not contain a sintering accelerator other than metal.

Also provided is a coke oven carbonization chamber wall repair material characterized in that the main component silica-based fine powder has SiO ₂ ≧ 65%, apparent specific gravity ≦ 2.5, and 90% or more has a particle size ≦ 150 μm. Is.

  Furthermore, it is difficult to sinter in the filling process at the joints or cracks damaged in the furnace wall in the carbonization chamber, and reaction firing is performed in an atmosphere mainly composed of air, carbon monoxide, carbon dioxide, or a mixture of two or more thereof. The present invention provides a repair material for a coke oven carbonization chamber wall characterized by containing one or more kinds of metal having cohesive properties.

  Furthermore, the present invention provides a repair material for a coke oven carbonization chamber wall, wherein the metal having reaction sintering property is Si, Al, or a mixture thereof.

  Furthermore, the present invention provides a repair material for a coke oven carbonization chamber wall, characterized in that the additive amount of the metal having reaction sintering property is 1% or less.

The present invention also provides a repair material for a coke oven carbonization chamber wall characterized in that the main component does not contain 1% or more of a B-based compound that generates a low-melting-point component in terms of B ₂ O ₃ .

  In addition, the pressure inside the carbonization chamber of the coke oven that partitions the combustion chamber and the carbonization chamber is maintained at a higher pressure than that of the combustion chamber, and repair material is applied to the damaged portion of joints or cracks that have occurred on the furnace wall in the carbonization chamber. A method of repairing a coke oven carbonization chamber wall in which a filler is blown and filled, wherein the repair material is composed of a silica-based fine powder of 50% or more as a main component and repaired with a repair material that does not include a sintering accelerator other than metal. A coke oven carbonization chamber wall repair method is provided.

  Furthermore, as a means for maintaining the pressure inside the carbonization chamber at a higher pressure than the combustion chamber, the carbonization combustion chamber is depressurized, and the repair material is sucked into the damaged part of the joints or cracks generated in the furnace wall from the carbonization chamber side. The present invention provides a method for repairing a coke oven carbonization chamber wall which is characterized by being filled.

  The repair material for the carbonization chamber wall of the coke oven according to the present invention is such that the repair material has a silica-based fine powder of 50% or more as a main component and does not contain a sintering accelerator other than metal as described in claim 1 above. Can improve the seal (air tightness) and fillability (filling depth) of the repair material, deeper the filling depth than the conventional material, and it is difficult for the repair material to be peeled off during the operation after repair. It is possible to significantly improve the performance, prevent incomplete combustion and black smoke from being generated due to leakage of coke oven gas into the combustion chamber, enable stable operation, and enable environmental measures.

Further, as described above, the main component silica-based fine powder is SiO ₂ ≧ 65%, apparent specific gravity ≦ 2.5, and 90% or more has a particle size ≦ 150 μm. The seal (air tightness) and the filling property (filling depth) can be improved, and the repair material is hardly peeled off during the operation after repair, and the durability after repair can be remarkably improved.

  In addition, it is difficult to sinter in the filling process at the joints or cracks in the furnace wall in the carbonization chamber as in claim 3 above, and air, carbon monoxide, carbon dioxide, or a mixture of two or more of them is used. By containing one or more kinds of metals that have reactive sintering properties in the main atmosphere, air or carbon monoxide is difficult to sinter in the filling process in the joints or cracks in the furnace wall. Or since it reacts and sinters in the atmosphere which mainly has a carbon dioxide or 2 or more types of mixed gas, a sealing performance can be improved.

  Further, as described above, when the metal having reaction sintering property is Si, Al, or a mixture thereof, the sealing property can be improved as described above.

  Furthermore, when the addition amount of the metal having reaction sintering property is 1% or less as in the above-mentioned claim 5, the air permeability can be reduced, the sealing (air tightness) property can be improved, and the crack (slit) ) Improvement of filling inside.

Furthermore, as described in claim 6 above, since the B-based compound that generates a low melting point component in the main component is not contained in an amount of 1% or more in terms of B ₂ O ₃ , the repair material can be used for damaged parts such as cracks and joints. When blown, repair material particles can be prevented from coming into contact with each other and agglomerating, and as mentioned above, the repair material can be sealed (airtight) and filled (filling depth) can be improved. The depth can be increased, and the repair material is hardly peeled off during the operation after repair, and the durability after repair can be greatly improved.

  Furthermore, in the state where the pressure inside the coking chamber of the coke oven that partitions the combustion chamber and the carbonizing chamber as in claim 7 is maintained at a higher pressure than the combustion chamber, A method for repairing a coke oven carbonization chamber wall in which a repair material is blown and filled into a damaged portion of a crack, wherein the repair material contains silica-based fine powder as a main component of 50% or more and includes a sintering accelerator other than metal. By repairing with no repair material, it can be repaired as described above.

Furthermore, as a means for maintaining the pressure inside the carbonization chamber at a pressure higher than that of the combustion chamber as in the above-mentioned claim 8, the carbonization combustion chamber is depressurized, and repair material is repaired in the damaged portion of joints or cracks generated in the furnace wall. By suctioning and filling the inside of the carbonization chamber, the pressure inside the carbonization chamber is made higher than that in the combustion chamber and the pressure in the carbonization combustion chamber is reduced, and the repair material is carbonized in the joints or cracks damaged on the furnace wall. It can be sucked from the chamber side and can efficiently fill the partition wall.
Other effects of the present invention are described below.

The perspective explanatory drawing which a part of the coke oven carbonization chamber of the present invention is omitted, Outline explanatory drawing of the hot simulation test device same as above, Relationship diagram between the air permeability and the floating concentration of the hot simulation test result of the comparative example as above, Damaged portion filling situation explanatory diagram of the comparative example, Relationship diagram of air permeability and floating concentration of hot simulation test results of Examples and Comparative Examples same as above, Damaged part filling condition explanatory drawing of an Example same as the above and a comparative example.

  The coke oven carbonization chamber wall repair material and repair method according to the present invention include a coke oven furnace chamber in which the pressure inside the coke oven partitioning the combustion chamber and the carbonization chamber is maintained at a higher pressure than the combustion chamber. The repair material is blown and filled in the damaged part of the joints or cracks generated in the wall, and the repair material has a silica-based fine powder as a main component of 50% or more and does not contain a sintering accelerator other than metal. It is characterized by.

  The carbonization chamber 2 of the coke oven 1 is heated from the combustion chamber 3 through the partition wall 4 as shown in FIG. 1 and is rapidly cooled when coke is extruded or coal is charged. Is exposed to severe temperature changes, causing breaks in the bricks and cracks in the bricks. In order to repair this damage, the internal pressure of the carbonizing chamber 2 to be repaired is set higher than that of the adjacent combustion chamber, and a repair material mainly composed of silica-based fine powder is blown into the carbonizing chamber 2 together with compressed air, The repair material is filled in the damaged portion and blocked by an airflow flowing from the carbonization chamber 2 to the combustion chamber 3 through joint breaks and cracks.

As a repair material, silica-based fine powder is a main component of 50% (weight%, the same shall apply hereinafter) or more, metal Si, Al having a reactive sintering property, a mixture thereof is 0.1 to 1.0%, B Refractory materials such as Al ₂ O ₃ can be blended in addition to 0 to 1.0% of the system compound.

The main component silica-based fine powder is 50 to 90%, preferably SiO ₂ ≧ 65%, more preferably 70% or more, apparent specific gravity ≦ 2.5, in consideration of suppression of sinterability and floatability. 90% or more preferably have a particle size ≦ 150 μm, ≧ 1 μm, volcanic ejecta (70-80% is glassy, including secondary deposits derived from volcanic ejecta, commonly known as Shirasu), volcanic ejecta Baked foam (commonly known as Shirasu balloon, pearlite, etc.), silica fume, and fly ash can be used.

In order to prevent the repair material particles from coming into contact with each other and agglomerating when the repair material is blown into a damaged portion such as a crack or a joint breakage, a sintering promoter other than metal is not added. It is preferable to reduce the low-melting-point generating component that promotes sintering in the components, and in particular not to contain 1% or more of the B-based compound that generates the low-melting-point generating component in terms of B ₂ O ₃ . It is preferable that the particle size ≦ 150 μm.

Moreover, in order to improve the sealing performance, it is difficult to sinter in the filling process of the joints or cracks in the furnace wall in the carbonization chamber, and a metal having reaction sinterability in an air or carbon monoxide atmosphere is used. It is preferable to contain 1 type or multiple types. As the metal having the reaction sintering property, Si, Al, or a mixture thereof is preferable. Moreover, it is desirable that the addition amount of the metal having reaction sinterability is 1% or less. It is preferable that the particle size ≦ 150 μm. Further, Al ₂ O ₃ or the like of the heat-resistant material preferably has a particle size ≦ 150 μm.

  Furthermore, as a means of maintaining the pressure inside the carbonization chamber at a pressure higher than that of the combustion chamber, the carbonization combustion chamber is depressurized so that the repair material is sucked from the carbonization chamber side into the joints or cracks damaged on the furnace wall. Then, it is preferable because the partition walls can be efficiently filled.

  For evaluation of the repair effect, it is necessary to measure the air permeability of the repaired part and observe the filling state.However, since direct air permeability measurement and disassembly inspection of the repaired part of the actual coke oven cannot be performed, a hot simulation test of dry seal repair is conducted. And examined. The experimental apparatus used for the evaluation is shown in FIG.

  In an electric furnace maintained at 100 ° C. with a test piece (width 30 × depth 30 × thickness 21 mm) with a simulated crack (slit 1 mm) cut out from silica brick as shown in FIG. 2 and fixed to a repair material introduction tube (φ24 mm) After blowing in the repair material for a certain period of time, measure the aeration by measuring the differential pressure between the inlet / outlet (atmospheric pressure) by changing the flow rate with the manometer on the inlet side, and check the repair effect (airtightness) evaluated. The repair material was blown through the guide tube by shaking the repair material placed in a sealed container to generate dust, blowing air at 2 L / min, and carrying the air current. The filling property was evaluated by cooling the test piece after completion of the test and then disassembling the test piece and measuring the maximum filling depth from the blowing side.

The air permeability as an evaluation index of airtightness was obtained by the following equation (1).
V / t = μx1 / ηxS / Lx (P ₁ -P ₂ ) x (P ₁ + P ₂ ) / (2P) (1)
here
μ: Air permeability [m ² ] η: Kinematic viscosity of gas [Pa · s]
P: Absolute pressure P [N / m ² = Pa] when measuring volume of passing gas
V: Volume of passing gas (absolute pressure P under measurement) [m ³ ]
t: Test question [sl S: Cross-sectional area of the test piece slit [m ² ] L: Test piece thickness [m]
P _1: Absolute during gas Susumuhito pressure ^{P [N / m 2 = Pa} ] P 2: Absolute pressure ^{P [N / m 2 = Pa} ] at a gas withdrawal

Table 1 Component characteristics table of comparative example

  As shown in Table 1, the evaluation results are shown in FIG. 3 for Comparative Examples 1 to 5 of commercially available repair materials by the hot simulation test. As test conditions, the air permeability at the time of firing at an atmospheric temperature in an electric furnace of 1000 ° C., an air flow rate of 2 L / min, a blowing time of 30 minutes, and firing for 3 hours after the blowing was measured hot. The floating concentration of the repair material was obtained by dividing the weight loss of the repair material by the amount of blown air.

  Comparative Example 5 is a dusting material repair material corresponding to Japanese Patent Application Laid-Open No. 11-335668, but the floating concentration is larger than other commercially available repair materials (Comparative Examples 1 to 4). However, the air permeability is higher than those of Comparative Examples 1 and 3, and the airtightness is inferior.

  Moreover, when the filling state of the repair material after the test is observed, Comparative Examples 2 to 4 hardly enter the slit as shown in FIG. In an actual coke oven, there is coke extrusion after coal charging or carbonization, and the seal on the surface of the furnace wall has a high probability of peeling, and there is a problem in durability. Comparative Examples 1 and 5 are filled inside the slit, and in particular, Comparative Example 5 reaches the vicinity of the exit of the test piece, so there is no fear of peeling off the surface, but the sintering or cohesion force is low, When it touches, it collapses immediately and there is a concern about the durability without much difference from filling with no powder.

  In order to maintain the filling property of Comparative Example 5 and improve the sealing property, the example of the repair material of the present invention employs a reactive sinterable metal as an additive for promoting sintering or aggregation after filling, As shown in Table 2, a volcanic glassy fired foam having a specific gravity of ≦ 2.5, 90% or more and a particle size of ≦ 150 μm, and metal Si having reactive sinterability were blended. The specific configuration is shown in Table 2.

Example 1 is obtained by adding 0.5% of metallic Si to Comparative Example 5 by internal division, and Example 2 adds 1% of metallic Si to Comparative Example 5 by internal division. Further, as an example in which the filling property is lowered when the sintering is accelerated too much, Comparative Example 6 in which 1% of B ₄ C is added to Comparative Example 5 is prepared and evaluated by a hot simulation test.

Table 2 Component characteristics table of examples of the present invention

  The results of the hot simulation test are shown in FIGS. It was confirmed that when metal Si was added, the air permeability decreased as shown in FIG. 5 and the sealing (airtightness) was improved. Moreover, it was confirmed that the inside of the crack (slit) can be filled as shown in FIG. However, since the filling depth becomes shallow when the addition amount is increased, the addition amount is preferably 1% or less, and preferably 0.5 to 1.0%.

On the other hand, in Comparative Example 6 to which B ₄ C was added, it aggregates at the entrance of the crack (slit) and is not filled at all inside. It was found that when the low melting point component was contained in this manner, when the repair material particles contacted at the slit inlet, they immediately aggregated and could not be blown into the interior. It is preferable not to include 1% or more of the B-based compound that generates the low melting point component in terms of B ₂ O ₃ .

  In Examples 1 and 2, compared with the conventional material having good filling properties (Comparative Example 5), the filling depth is slightly shallow, but the inside of the cracks (slits) is sufficiently filled, and the airtightness is excellent. It was verified that In addition, in Examples 1 and 2, it was confirmed that the same air permeability as that of the conventional material having high airtightness (Comparative Example 1) was obtained, and that the airtightness was also excellent.

  As described above, in the coke oven carbonization chamber wall repair material and repair method according to the present invention, the seal (air tightness) and fillability (filling depth) of the repair material can be improved. Further, since the filling depth can be made deeper than that of the conventional material, the repair material is hardly peeled off during the operation after the repair, and the durability after the repair can be remarkably improved. As a result, incomplete combustion and black smoke due to leakage of coke oven gas into the combustion chamber can be prevented, stable operation and environmental measures can be taken.

  INDUSTRIAL APPLICABILITY The present invention can be used to repair damaged parts such as joint breaks and cracks generated in the carbonization chamber and combustion chamber partition walls of the coke oven in the steelmaking field and others.

    DESCRIPTION OF SYMBOLS 1 ... Coke oven 2 ... Coking chamber 3 ... Combustion chamber 4 ... Partition

Claims (8)

While maintaining the pressure inside the coking chamber of the coke oven that partitions the combustion chamber and the carbonizing chamber at a higher pressure than the combustion chamber, the repair material is blown into the damaged part of the joints or cracks that have occurred on the furnace wall in the carbonizing chamber. Coke oven carbonization chamber wall filling material filled with
A repair material for a coke oven carbonization chamber wall, wherein the repair material contains silica-based fine powder as a main component of 50% or more and does not contain a sintering accelerator other than metal. _2. The coke oven carbonization chamber wall repair according to claim 1, wherein the main component silica-based fine powder is SiO ₂ ≧ 65%, apparent specific gravity ≦ 2.5, and 90% or more has a particle size ≦ 150 μm. Wood.   It is difficult to sinter in the filling process of damaged parts of joints or cracks generated in the furnace wall in the carbonization chamber, and it is reactive sinterability in an atmosphere mainly composed of air, carbon monoxide, carbon dioxide or a mixture of two or more of them. The repair material for a coke oven carbonization chamber wall according to claim 1 or 2, comprising one or more kinds of metals having the following.   4. The repair material for a coke oven carbonization chamber wall according to claim 3, wherein the metal having reactive sinterability is Si, Al, or a mixture thereof.   The repair material for a coke oven carbonization chamber wall according to claim 3 or 4, wherein the amount of the metal having reaction sintering property is 1% or less. Coke oven carbonization chamber wall repair material according to any one of claims 1, characterized in that does not contain B type compound that produces a low-melting component in the main component terms _of B ₂ O ₃ 1% or more at 5. While maintaining the pressure inside the coking chamber of the coke oven that partitions the combustion chamber and the carbonizing chamber at a higher pressure than the combustion chamber, the repair material is blown into the damaged part of the joints or cracks that have occurred on the furnace wall in the carbonizing chamber. Coke oven carbonization chamber wall filling method,
A method for repairing a coke oven carbonization chamber wall, wherein the repair material is repaired with a repair material containing silica fine powder as a main component of 50% or more and containing no sintering accelerator other than metal.   As a means of maintaining the pressure inside the carbonization chamber at a higher pressure than the combustion chamber, the carbonization combustion chamber is decompressed, and the repair material is sucked into the joints or cracks in the furnace wall from the carbonization chamber. The method for repairing a coke oven carbonization chamber wall according to claim 7.

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