KR101143146B1 - Method of producing coke and method of testing refractoriness under load using it - Google Patents

Abstract

PURPOSE: A coke manufacturing method and a testing method using the same are provided to reduce the non-uniformity of area of cokes put into a crucible below 5% in a refractoriness under load test. CONSTITUTION: A coke manufacturing method comprises the steps of: mixing specimens to obtain dough, molding the dough into a spherical shape, finishing the spherical specimens, and burying the molded specimens in pulverized coal to heat and cooling the specimens. The dough is molded using a mold composed of upper and lower molds with semispherical grooves.

Description

Method of Producing Coke and Method of Testing Refractoriness Under Load Using It}

The present invention relates to a method for producing coke for load softening test and a test method using the same, which are suitable for a test apparatus for analyzing load softening melting phenomenon of a charge at a high temperature by varying the gas composition reaction temperature and applied load under experimental conditions similar to those in a blast furnace. will be.

Load softening occurs in the blast furnace, and a test apparatus for analyzing the load softening melting phenomenon by simulating the load softening in the blast furnace has been proposed.

1 shows an example of a test apparatus for analyzing such a load softening melting phenomenon. The crucible 20 that simulates the blast furnace is mounted to the crucible pedestal 25, and the alumina pedestal 30 is inserted into the crucible pedestal 25. The crucible 20 and the crucible pedestal 25 are inserted into the reaction tube 18.

The load applying unit 10 is disposed above the crucible 20, and the load applying unit 10 transmits the load of the load applying unit 10 to the crucible 20 through the load rod 15. The weight 11 is placed on the load applying unit 10.

On the other hand, the gas inlet 40 is connected to the lower portion of the reaction tube 18, the exhaust pipe 60 is formed on the upper portion of the reaction tube 18, the gas supply and exhaust is generated similar to the situation of the blast furnace Let's do it. In addition, the exhaust pipe 60 may be equipped with a differential pressure gauge (not shown).

A pipe opening 50 is formed near the gas injection unit 40 to discharge the falling object from the crucible 20, and the electric furnace 70 surrounding the reaction tube 18 around the reaction tube 18. Is arranged to heat the reaction tube 18. This apparatus is a test apparatus which grasps the state of a sample in the crucible 20 inside the reaction tube 18 by heating the reaction tube 18 through the electric furnace 70 in the state which applied the load.

2 shows the crucible 20 in the load softening test apparatus 1. The crucible 20 has a lower surface 21 having a groove 22 formed therein. Inside the crucible 20, coke, sample, and coke are stacked in order from the bottom, and the load rod 15 applies the load from the load applying unit 10 to the crucible.

The sample to be filled in the crucible 20 is to put the material to be tested, the coke is introduced to the filtered coke to have a particle size of approximately 8 ~ 9mm. However, even if the sample rises to the melting temperature in such a crucible 20, there is a problem in that a melt failure phenomenon in which the melt does not fall occurs.

A differential pressure graph with temperature when no melting occurs is shown in FIG. 3. In FIG. 3, the X axis represents temperature (° C.) and the Y axis represents differential pressure (mmH ₂ O). In the graph of FIG. 3, it can be seen that after the differential pressure rises sharply at the melting temperature, a melt defect occurs in which the differential pressure does not decrease again.

However, this phenomenon has a problem in that it is not clear whether the characteristics of the sample, that is, the viscosity is high when the sample is melted, is not a smooth drop of the melt or a failure of the test apparatus.

Therefore, in the case of testing according to the conventional test method, it is not known whether the coke shape is non-uniform, the pore flow path diameter is small, poor ventilation and fluid permeability, so that poor melt phenomenon occurs or the characteristics of the sample. There is a limitation that it is difficult to understand the characteristics of the softening of the load.

The present invention is to solve the above problems, it is an object to improve the coke introduced during the load softening experiment.

An object of the present invention is to provide a uniform coke production method and to provide a reliable load softening experiment.

In addition, an object of the present invention is to provide a load softening test method that can prevent the failure of the melt due to the test apparatus, and can accurately grasp the characteristics of the sample.

The present invention is to achieve the above object, the sintered ore physical properties of the sintered ore is required for the analysis of the blast furnace operation and development of the application technology, if the failure failure phenomenon repeatedly occurs in the load softening test as described above, It was not known whether the difference was due to characteristics or simulations, so that the characteristics of the sample related to the poor use could not be determined.

Therefore, the inventors of the present invention, even if using the coke with the particle size filtered as a cause of the melt failure, the coke introduced into the crucible that simulates the blast furnace is only a very small amount compared to the blast furnace, when the variation in the area of the coke is large melt It has been pointed out that there is a problem that a defect occurs.

Therefore, using the pulverized coal, a method for experimenting with coke having a small variation in the area of coke and a method for producing coke which can be applied thereto have been invented.

Specifically, in the present invention, a dough manufacturing step of making a dough by mixing a sample by the method of producing such coke; A molding step of molding the kneaded sample into a sphere; And a finishing step of finishing to raise the sphericity of the molded sample. And it provides a test coke production method comprising the step of embedding the molded sample in the pulverized coal to raise the temperature and then cooled.

In addition, the molding step in the test coke manufacturing method of the present invention is molded by putting the dough into the mold, the mold includes an upper mold and a lower mold, each mold may be formed in a hemispherical groove.

In addition, the coke forming step may increase the molded sample to 1100 ~ 1200 ℃.

Further, the dough manufacturing step includes adding molasses and water of 80 ~ 100 ℃ to the mixed sample after mixing pulverized coal, pitch, cement, the mixed sample is 15 to 25% pitch, 5 to 15 It may comprise a cement of the remainder and the remainder of the pulverized coal, and may comprise a drying step of drying the molded sample after the forming step.

At this time, the drying step may be dried for more than 3 hours in a dry oven.

Alternatively, in the present invention, in the load softening test method, the coke, the sample, and the coke are sequentially introduced into the crucible, and then ignited while the load is in the crucible, and the load softening test method for analyzing the load softening phenomenon of the sample. A load softening test method comprising a coke manufacturing step of forming and manufacturing coke into a spherical shape before introducing coke into a crucible.

In addition, in the load softening test method, the coke introduced into the crucible may have an area unevenness of 5% or less.

The present invention can improve the coke introduced during the load softening experiment through the above configuration.

The present invention can provide a uniform method for producing coke, to provide a reliable load softening experiment.

In addition, the present invention can provide a load softening test method in which the melt failure phenomenon does not occur due to conditions other than the characteristics of the sample.

1 is a perspective view of a conventional load softening test apparatus.
2 is a schematic cross-sectional view of the crucible of FIG. 1.
3 is a differential pressure graph according to temperature by a conventional load softening test apparatus.
4 is a flowchart of the coke production method of the present invention.
5 is a perspective view of a mold used for producing the test coke of the present invention.
6 is a perspective view of the upper mold used for producing the test coke of the present invention.
7 is a perspective view of a lower mold used for producing test coke of the present invention.
8 is a differential pressure graph according to temperature by the load softening test apparatus of the present invention.

Hereinafter, with reference to the accompanying drawings, it will be described in detail a specific embodiment of the present invention.

Preparation of Test Coke

4 is a flow chart of the coke production method in the present invention.

As shown in FIG. 4, a sample is prepared by mixing 70% of CDQ dust to pulverized coal (Coke Dryer Quenching DUST), 20% of pitch, and 10% of cement as a binder. Sample molasses is mixed by mixing molasses 29g per 80 g of mixed samples and 82 g of water at 80 to 100 ° C.

In the present invention, when the pitch is added in the range of 15 to 25% or the cement is outside the range of 5 to 15%, when the coke is formed, the same action as the actual coke is not possible, so the pitch is 15 to 25%, cement Mix within the range of 5-15%, the remainder is filled with CDQ DUST.

This sample dough is put into the mold 100. It is preferable to apply a lubricant, such as oil of mold 100, before removing it to mold 100, and to facilitate removal from mold 100 later. The lubricant preferably has a volatilization temperature of 110 ° C. or higher so as not to volatilize in dry drying after the sample dough is inserted.

FIG. 5 is a perspective view of a mold 100 used for producing the test coke of the present invention, FIG. 6 is a perspective view of an upper mold used for producing the test coke of the present invention, and FIG. It is a perspective view of the lower mold used for manufacture of test coke.

As shown in FIG. 5, the mold 100 of the present invention includes an upper mold 120 and a lower mold 110, and the upper mold 120 and the lower mold 110 may be coupled in place. It consists of a guide member 130 for guiding the 120 and the lower mold (110).

6 shows the lower mold 110, the lower mold 110 is formed with a plurality of hemispherical grooves 112 into which the sample dough can be inserted, the guide member 130 is inserted into the corner Through holes 115 are formed.

7 shows the upper mold 120. The upper mold 120 serves to cover the sample dough introduced into the lower mold 110 from above, and the hemispherical grooves 122 are formed in the hemispherical grooves 112 of the lower mold 110 to form the dough. It is formed in the same arrangement as the arrangement of.

In the case of the upper mold 120, the groove 122 is formed in the upper mold 120, the groove 122 is formed in the jaw 121. The groove 122 has a communication path through which the sample dough can flow when more sample dough is injected than a space between the groove 122 of the upper mold 120 and the groove 112 of the lower mold 110. 123 is formed.

The communication path 123 connected to the groove 122 adjacent to the jaw 121 is connected to the communication path 123 to the outside of the jaw 121, but in the case of the groove 122 that is not adjacent to the jaw 121, the groove The communication path 123 is connected to the space portion 124 formed between the 122 and the groove 122.

The upper mold 120 also has a through hole 125 in which the guide member 130 can be inserted at the corner. Accordingly, the upper mold 120 and the lower mold 110 may be coupled in place through the guide member 130, and the hemispherical grooves 122 and the lower mold 110 of the upper mold 120 may be coupled. Sample dough may be placed between the hemispherical grooves 112 to be spherically shaped.

On the other hand, the sample dough is put into such a mold (100). In this way, the sample dough introduced into the mold 100 presses the upper mold and the lower mold at a pressure of about 150 bar through the press in the injected state. Accordingly, the grooves 122 and 112 of the upper mold 120 and the lower mold 110 may shape the sample dough into a spherical shape of the mold.

The pressurized mold 100 is dried in a dry oven at 100 ° C. for 3 hours or more, and the sample dough is cured while being dried to form coal briquettes and separated from the mold 100. If the drying oven is not dried for more than 3 hours, the drying is not sufficient, so the shape of the coal briquettes may be damaged in the mold ejection process. In the present invention, since the shape of the coal briquettes is required to be uniform, drying in a dry oven for 3 hours or more is preferable.

After drying of the spherical coal briquettes is completed, the coal briquettes are removed from the mold 100, and the coal briquettes removed from the mold 100 are polished to raise the sphericity. It is most preferable to perform the surface finish after the sample is formed of coke, not only because the hardness of the coke becomes high, but also the shape of the coke may be damaged.

As such, by trimming the surface of the coal briquettes, the coal briquettes formed in the mold 100 may have the same size, and thus, when the coal briquettes are put into the crucible 20 and tested later, the coal briquettes may have a certain void. The occurrence of a defective phenomenon can be prevented.

After the CDQ DUST as pulverized coal is laid, the finished coal briquettes are arranged, and the coal briquettes are completely covered with the CDQ DUST as pulverized coal, and the coal briquettes are embedded in the CDQ DUST.

After the coal briquettes embedded in the CDQ DUST are covered with a dish, the coal briquettes are heated to 1100 to 1200 ° C, for example, 1150 ° C, and then cooled again. Since the coal briquettes embedded in the present invention are embedded in the CDQ DUST and are heated to a high temperature, the coal briquettes are not decarburized even at a high temperature and can be formed as coke. When the coal briquettes cooled in this way are extracted from CDQ DUST, manufacture of a spherical coke is completed.

evaluation

Table 1 shows the area (mm 2) of coke produced according to the coke production method of the present invention and their standard deviation, mean, and relative standard deviation (RSD). In this embodiment, the area of the coke was obtained by arranging the coke and taking a picture, and then measuring the area of the curved surface formed by the outline.

As shown in the above table, in the case of coke manufactured according to the coke manufacturing process of the present invention, the relative standard deviation (RSD) is only 2.23, it can be seen that the shape of the manufactured coke is uniform.

The coke thus prepared was put into the crucible 20 and then tested for softening of the load in the test apparatus 1, and the resulting graph is shown in FIG.

As shown in FIG. 8, in the case where no melt failure occurs due to the viscosity of the sample, the differential pressure rises only at the melting point and returns to the original position. Therefore, the method for producing the coke of the present invention and the test method including the same are important for understanding the characteristics of the sample.

In addition, when the area unevenness, that is, the relative standard deviation of the area is 5% or less, as in the coke of the present invention, no melt failure due to the coke occurs. Therefore, if a melt failure occurs, it can be seen that the viscosity is large when the sample is melted.

Therefore, the coke manufacturing method of this invention and the test method which inputs and tests the coke manufactured by this manufacturing method can grasp | ascertain the characteristic of the sample which was not able to grasp conventionally.

Claims (7)

Dough manufacturing step of mixing the sample to make a dough;
A molding step of molding the kneaded sample into a sphere;
A finishing step of finishing to raise the sphericity of the molded sample; And
And a coke forming step of embedding the molded sample in pulverized coal and heating the same. The method of claim 1,
The molding step is molded by putting the dough into the mold,
The mold includes an upper mold and a lower mold, each mold is characterized in that hemispherical grooves are formed. The method of claim 2,
The coke forming step is a method for producing coke, characterized in that for heating the molded sample to 1100 ~ 1200 ℃. The method of claim 3, wherein
The dough manufacturing step includes adding molasses and water of 80 ~ 100 ℃ to the mixed sample after mixing the pulverized coal, pitch, cement,
The mixed sample includes 15 to 25% pitch, 5 to 15% cement and the rest of the pulverized coal,
And a drying step of drying the molded sample after the forming step. The method of claim 4, wherein
The drying step is a method for producing coke, characterized in that the drying for 3 hours or more in a dry oven 100 ℃ or more. In the load softening test method to sequentially input the coke, sample, and coke to the crucible, and then to heat the crucible while the crucible is loaded, to analyze the load softening phenomenon of the sample,
The coke introduced into the crucible is a load softening test method, characterized in that produced by the coke manufacturing method of any one of claims 1 to 5. The method according to claim 6,
The coke introduced into the crucible is a load softening test method, characterized in that the area unevenness is 5% or less.

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