KR101550668B1 - Mixture for manufacturing cokes and the method thereof - Google Patents

Abstract

The present invention relates to a mixture for coke production and a method for producing coke using the same, comprising the steps of: preparing an additive including coke and a polymer resin; Preparing a mixture by mixing the coke and the additive; And charging the mixture into a coke oven to produce a coke, thereby improving the reactivity of the coke.

Description

TECHNICAL FIELD The present invention relates to a mixture for coke production and a method for manufacturing coke using the same.

The present invention relates to a coke-making mixture and a coke-making method using the same, and more particularly, to a coke-making mixture capable of improving the reactivity of the coke, and a coke making method using the same.

Generally, the coke used in the operation of a blast furnace of a steel mill is subjected to various steps in advance. For example, coke is charged into a carbonization chamber of a coke oven in a large amount (about 32 tons) of cokes, heated at a temperature of about 1200 ° C or higher for about 18 hours, extruded and cooled in a separate fire extinguishing facility The process of production.

In recent years, in line with efforts to reduce CO ₂ , which is a green house gas (GHG), the steel industry is also making efforts to reduce CO ₂ emissions. One of them is to reduce the ratio of the reducing agent to the energy source used in the blast furnace by using highly reactive coke with improved reactivity.

The highly reactive coke accelerates the gasification reaction that generates carbon monoxide (CO) in the low temperature region of the blast furnace to lower the temperature of the heat storage zone, thereby increasing the driving force required for reduction represented by the difference between the actual gas concentration and the reduction equilibrium gas concentration It has been reported that the efficiency is increased and the ratio of the reducing agent is decreased.

The gasification reactivity of the highly reactive coke can be improved by the promoter added in the preparation of the highly reactive coke, and accelerators such as alkali and iron series which can be used as the gasification reaction accelerator have been studied.

A highly reactive coke is produced by spraying a liquid promoter to coke produced in a coke oven or by adding a post-promoter to make a coating film by immersing the coke in a promoter solution and a promoter (alkaline oxide, iron oxide) in the coke- Can be prepared by a pre-accelerator addition method that is manufactured in an oven. However, when the reactivity of the coke is improved by using the accelerator as described above, the strength of the coke is lowered because locally promoted coke differentiation occurs in a region where the promoter is located in the coke matrix and the promoter activity is affected.

JP2011-202159A

The present invention provides a coke-making mixture capable of producing a coke excellent in reactivity and a coke making method using the same.

The present invention provides a coke-making mixture capable of improving the quality of coke and a coke making method using the same.

The mixture for coke production according to the embodiment of the present invention is a mixture for producing coke, comprising: coking coal; And an additive containing a polymer resin.

The additive may be a polymer resin having a benzene ring, for example, a phenol resin.

The additive may be included in an amount of 3 to 7% by weight based on the total weight of the coke and the additive.

A method of manufacturing a coke according to an embodiment of the present invention includes the steps of: preparing an additive including coke and a polymer resin; Preparing a mixture by mixing the coke and the additive; And charging the mixture into a coke oven to produce a coke.

The additive may be a polymer resin having a benzene ring, and the polymer resin may be a phenol resin.

The additive may be added in an amount of 3 to 7% by weight based on the total weight of the coke and the additive.

The particle size of the additive may be 5 mm or less.

The mixture for producing coke and the method for producing coke using the same according to the embodiment of the present invention can suppress deterioration of the quality of coke which may be generated in the process of producing highly reactive coke. That is, by using a polymer as an additive for improving the reactivity of the coke, the specific surface area of the coke can be increased as a whole to form a low-density matrix structure that facilitates the reaction. Therefore, it is possible to perform a uniform reaction over the entire coke, thereby improving the process efficiency.

1 is a conceptual view showing a process of manufacturing a coke according to an embodiment of the present invention;
2 is a flow chart illustrating a method for manufacturing coke in accordance with an embodiment of the present invention.
FIG. 3 is a graph showing thermal property results by thermogravitry (TG) of an additive (a polymer substance) applied to an embodiment of the present invention. FIG.
4 is a graph showing the density change of coke produced according to an embodiment of the present invention.
5 is a graph showing the experimental results of the reactivity of the coke produced according to the embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but may be embodied in various different forms, and it is to be understood that these embodiments are merely illustrative of the principles of the invention and are not intended to limit the scope of the invention to those skilled in the art. It is provided to let you know completely.

FIG. 1 is a conceptual view showing a process of manufacturing a coke according to an embodiment of the present invention, FIG. 2 is a flowchart showing a coke making method according to an embodiment of the present invention, FIG. (TG) of thermogravimetric analysis (polymeric material) of the polymer electrolyte membrane.

1 and 2, a method of manufacturing a coke according to an embodiment of the present invention includes the steps of preparing a carbonaceous material (S100), preparing an additive (S102), mixing the carbonaceous material with an additive, (S120) of charging the mixture of the carbonaceous material and the additive into the coke oven and performing the carbonation (S120), and cooling the carbonated red gypsum coke to the fire extinguishing facility (S130). At this time, a polymer resin may be used as an additive.

First, in the process of preparing the carbonaceous material, the coke loaded in the yard is crushed to 10 mm or less from the crusher and stored in the storage hopper. At this time, various kinds of coking coal can be used, and the fraction of the crushed coking coal having a particle size of 3 mm or less is 80 to 90% and the water content is 7 to 11%.

Next, the various types of coke stored in the storage hopper are mixed and discharged at a predetermined mixing ratio in a mixing tank considering the degree of coalification and the degree of integrity of each coke.

Thereafter, a separate drying treatment may be performed to remove moisture contained in the raw material mixture, that is, the raw material mixture discharged from the mixing tank.

As the additive, a polymer resin may be used, and an aromatic resin having a benzene ring such as a phenol resin or the like may be used. In the present invention, by using the polymer resin as an additive for increasing the reactivity of the coke, the specific surface area of the coke can be increased to form a low-density matrix structure that is easy to react.

Of the materials that can be used as additives, the phenolic resin has the properties as shown in Table 1. [

Physical state
물리 상태 Particle size (%) Moisture content (%) plate flow (mm) Melting point (캜) Linear
Phenolic resin light yellowish power When the particle size is 75 占 퐉 or less, Up to 0.8 27 ~ 39
at 125 ° C for 30 min 80 ~ 90
using capillary tube

The phenol resin is in the form of a pale yellow powder, and the particle diameter of 75 μm or less occupies about 95%. The water content is 0.8% or more, and the melting point is about 80 to 90 占 폚. And has a fluidity of about 27 to 39 mm when placed at 125 ° C for 30 minutes.

Referring to FIG. 3, there is shown a result of analyzing the thermal properties of the phenol resin through thermogravimetry (TG). Here, the thermogravimetric analysis was an analysis to measure the weight change occurring in the material during heating, and the temperature was measured up to 1000 ° C at a heating rate of 3 ° C per minute in a nitrogen atmosphere. As a result of thermogravimetric analysis, the weight loss of phenolic resin decreases with increasing temperature. Accordingly, when the phenol resin is used as the additive, the decrease in the production amount of the coke can be suppressed.

The additive may be used in an amount of about 3 to 7% by weight based on the total weight of the carbonaceous material and the additive. When the amount of the additive used is less than or more than the recommended range, the effect of improving the reactivity of the coke is insignificant. This will be described again with reference to the density and reactivity of the coke produced according to the embodiment of the present invention.

The mixture of the carbonaceous material and the additive is charged into the coke oven and dried at a temperature of about 1100 ° C or higher to produce the coke, and then the prepared coke is transferred to the cooling equipment for cooling.

Hereinafter, an experimental example for evaluating the quality of the coke produced by the coke making method according to the embodiment of the present invention will be described.

FIG. 4 is a graph showing the density change of the coke produced according to the embodiment of the present invention, and FIG. 5 is a graph showing the results of the reactivity test of the coke produced according to the embodiment of the present invention.

In this experiment, a high - reactivity coke was prepared by mixing additives such as polymer resin into a carbonaceous material for coke production in a coke test furnace, and the quality of the prepared high - reactivity coke was evaluated.

The blend for coke production was mixed with 10 kinds of single coals, and the particle size was less than 3 mm to 82%. The moisture content is 9%.

Phenol resin was used as the additive, and the additive was added to the total weight of the additive and additives at 0, 5, and 10% by weight so as to have a charging density of about 740 kg / m 3.

First, the density of each of the produced coke was measured. The density of the coke was measured by a gas pycnometer using helium gas.

Next, the reactivity of the produced coke was measured. The reactivity of the coke was measured by crushing a certain amount of coke by particle size and then charging 40 g of coke (sample) having a size of about 19 to 21 mm into a CO ₂ reaction furnace and heating at a flow rate of 5 l / min at 1100 ° C And maintained for 120 minutes. After cooling to about 50 ° C, the remaining sample was weighed to calculate the reaction rate.

The reactivity of the coke was measured and the density of the remaining sample was measured.

Referring to FIG. 4, it can be seen that the density of the coke decreases as the amount of the additive before the reaction increases. On the other hand, after the reaction, the density increases as the amount of the additive used increases. This is because when a polymer resin is added as an additive, a low-density matrix which is easy to react is formed to a large extent, and the density of the coke is decreased. However, since the reaction is improved and more low-density matrix is reacted and removed, the coke density after the reaction is rather increased . As shown in FIG. 5, when the amount of the polymer resin used is increased, the coke reactivity (CRR) of the coke increases, which is consistent with the experimental results.

When 5 wt% of the polymer resin is added, the coke reactivity is increased by about 10%, but when the polymer resin is added by 10 wt%, the coke reactivity is improved to about 1%. Therefore, the improvement in the amount of the polymer resin used and the coke reaction rate is not linear, and it is found that the use of the additive in an amount in the range of 3 to 7% by weight is effective in improving the coke reaction rate have.

Although the present invention has been described in connection with certain exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Therefore, the scope of the present invention should not be limited by the described embodiments, but should be defined by the appended claims and equivalents thereof.

Claims (8)

As a mixture for producing coke,
Coking coal;
An additive containing an aromatic resin having a particle size of 75 mu m or less and a benzene ring having a particle size of 90% or more,
Wherein the additive comprises 3 to 7% by weight based on the total weight of the coke and the additive. The method according to claim 1,
Wherein the resin having the benzene ring is a phenol resin. delete A step of preparing an additive including coke and an aromatic resin having a particle size of not more than 75 탆 and a particle size of not less than 90% and a benzene ring;
Preparing a mixture by mixing the coke and the additive; And
Charging the mixture into a coke oven to produce a coke;
≪ / RTI > delete The method of claim 4,
Wherein the aromatic resin having the benzene ring is a phenolic resin. The method according to any one of claims 4 to 6,
Wherein the additive is added in an amount of 3 to 7% by weight based on the total weight of the coke and the additive. delete

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