KR101456449B1 - Method for Highly reactive cokes - Google Patents

Abstract

The present invention relates to a method of producing a coke, which comprises the steps of preparing a raw material coal, preparing a byproduct of a coal-based additive manufacturing process, crushing the raw coal and by-product, and mixing the raw material crushed and the crushed- To prepare a mixture using the coke oven, and a step of preparing the mixture using the coke oven.

Description

{Method for Highly reactive cokes}

The present invention relates to a process for producing coke, and more particularly to a process for producing coke having excellent reactivity.

The world is trying to develop carbon dioxide abatement technology, and each country is reducing carbon dioxide emissions and increasing investment in renewable energy.

On the other hand, the steel industry is an industry that produces steel by consuming a large amount of raw materials and energy. In response to the global trend to reduce the consumption of fossil fuels, technologies are being developed to reduce the blast reduction ratio in terms of energy efficiency improvement. It is required to manufacture a coke having excellent reactivity by reducing the ratio of coke to heavy coke.

The highly reactive coke promotes gasification reactivity in the low temperature region in the blast furnace to reduce the heat storage temperature. For example, there is an effect of reducing the reduction ratio by increasing the reaction efficiency by increasing the driving force required for reduction represented by the difference between the actual gas concentration and the reducing equilibrium gas concentration. The gasification reactivity of the coke excellent in reactivity is improved by the additive added to the raw coal in the production of coke, and various additives are being studied.

Additives used to improve coke quality in coke making can be classified as vegetable, petroleum or coal.

First, vegetable oil, palm oil and soybean oil are used as vegetable additives. The use of vegetable additives can contribute to the improvement of coke strength by improving the charging density. It is used for actual operation, but the coke quality effect is smaller than the price.

Second, heavy oil and asphalt pitch are used as petroleum additive. The petroleum-based additive may be added during the production of the coke to improve the cohesion of the coal, thereby contributing to the improvement of the coke strength. The effect is higher than that of the vegetable-based additive, but the cost is high, so that it is difficult to be used in large quantities in actual operation.

Thirdly, the coal-based additive is extracted and added to coal using a solvent derived from coal, that is, coal tar, an aromatic solvent, and a hydrogen-based solvent. It is possible to improve the strength of coke by improving the cohesion of coal by adding the cohesive component at the time of coke production. Compared to the above-mentioned petroleum-based additives, the cost is low and the resources are abundant.

On the other hand, coal obtains additives and by-products through a solvent extraction process or a coal liquefaction process. The additive is solvent refined coal (SRC), which is used as an additive to produce high strength coke in coke production. Both of the solvent extraction process and the coal liquefaction process produce a significant byproduct. The specific gravity of the byproducts accounts for 30 to 50 percent of the specific gravity of the total product, has a low carbon content, a high volatile content, and a large amount of ash as compared with the raw coal, making it difficult to recycle by-products by applying the conventional coal-based additive technology.

Accordingly, there is a need to develop a technology for efficiently reusing byproducts generated in the solvent extraction process or the coal liquefaction process of coal.

KR 1008167930000 B

The present invention provides a coke making method capable of lowering the reaction starting temperature of coke.

The method for producing coke in the embodiment of the present invention is characterized in that the process for preparing the raw coal, the process for preparing the byproduct of the coal-based additive manufacturing process, the process for crushing the raw coal and the by-product, Preparing a mixture by using a mixer, and preparing the mixture by using a coke oven.

In addition, the process for preparing the mixture includes mixing the by-product in an amount of 3 wt% or more to 10 wt% or less based on the total specific gravity of the mixture.

Further, the raw material carbon is a compounded carbon in which a plurality of carbons are mixed, and each of them contains carbides having different volatile content.

Also, the blended coal may include low-volatile coal classified according to the volatile content, medium-volatile coal having a larger volatile weight than the low-volatile coal, and high-volatile coal having a volatile weight higher than that of the low volatile coal .

The low volatile fraction coal is coal having a volatile content of less than 15 percent by weight based on the total weight of the individual low volatile fraction coal, and the volatile fraction of the individual volatile fraction coal is not less than 15 percent 25 percent or less of said high volatility coal, said high volatility coal being one in which the volatile content by weight of the individual high volatility coal is greater than 25 percent.

The process for preparing the by-product may further include a step of preparing raw coal by crushing and drying low-grade coal, preparing a solvent, charging the pulverized raw coal and the solvent into a slurry maker, Transferring the slurry to an extraction reactor and subjecting the slurry to an extraction reaction, separating the extraction-completed material into a soluble fraction and an insoluble fraction, transferring the insoluble fraction to a drier, and drying the fraction to obtain the by- ≪ / RTI >

Further, the low-grade coal includes at least one of the following: argon, lignite, and bituminous coal.

Also, the crushing process may be performed by crushing the raw coal and the by-product so that the particle size of the raw coal and the by-product is 10 mm or less, and 80% to 90% of the particles having a particle size of 3 mm or less As required.

Also, the raw material coal has a volatile content in the range of 15 wt% or more to 20 wt% or less, and ash content in the range of 5 wt% or more to 10 wt% or less.

The coke has a volatile content ranging from 10 wt% or more to 15 wt% or less and a by-product ranging from 10 wt% or more to 15 wt% or less.

Further, the reaction starting temperature of the coke has a low temperature within a range of -10 degrees to -60 degrees from the reaction starting temperature of the raw material carbon.

According to the embodiments of the present invention, there is provided a coke producing method excellent in reactivity.

Also, a coke having excellent reactivity is prepared by using a composition containing raw materials of coke raw materials added with by-products obtained in a coal-based additive manufacturing process. The coke made from such a composition can reduce the coke use ratio and the blast furnace reduction ratio by ensuring a reaction initiation temperature lower than the reaction initiation temperature of the existing coke.

In addition, by-products can be used to create new applications with high added value and high profitability.

In addition, the cost of disposing or reclaiming by-products can be saved, and the amount of by-products produced is abundant, which makes it possible to mass-produce coke with high reactivity at low cost.

Further, in the blast furnace process using a coke having excellent reactivity, there is an advantage of being environmentally friendly which can reduce carbon dioxide emissions.

1 is a schematic view of a process for producing a coal-based additive according to an embodiment of the present invention.
2 is a flowchart of a coke making method according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, Is provided to fully inform the user. Wherein like reference numerals refer to like elements throughout.

The coke according to the embodiment of the present invention is a coke having excellent reactivity. By-products are obtained in the process of producing a coal-based additive and a by-product obtained in the coke raw material is added to prepare a composition, . Here, the by-products are crushed to be in powder form and blended with the raw coal according to the set composition ratio. Here, the composition ratio is set so that the finally produced coke has a reaction starting temperature lower than the reaction starting temperature of the conventional coke, that is, excellent in reactivity. In addition, the content of byproducts relative to the total weight of the composition according to an embodiment of the present invention can be adjusted for the quality of coke having excellent reactivity.

The byproducts according to the embodiments of the present invention are produced as byproducts in the production of coal-based additives in the coal-based additive manufacturing process. Here, as the coal-based additive manufacturing process, a solvent extraction process of coal or a coal liquefaction process may be used.

The final coke produced through the coke making process according to the embodiment of the present invention is characterized by excellent reactivity. This is an effect of the alkali component among the components of the by-product added to the coke production. For example, the alkali component of the by-product and its oxide meet with carbon dioxide (CO ₂ ) and carbon (C) components in the blast furnace to produce carbon monoxide (CO). This phenomenon promotes indirect reduction in the blast furnace, resulting in a lower temperature of the heat storage zone. The alkali components of the by-products and their oxides are described in more detail below.

Hereinafter, a process for producing a coal-based additive according to an embodiment of the present invention will be described. 1 is a schematic view of a process for producing a coal-based additive according to an embodiment of the present invention.

Referring to FIG. 1, a method for producing a coal-based additive is as follows.

First, raw materials are prepared (S100). For example, as raw material coal, low-grade coal is crushed to a predetermined particle size using a crusher. Here, the size of the predetermined particle size is such that it can be mixed well with the solvent to be described below, for example, the particle size may be 10 mm. Here, low grade raw coal refers to raw coal classified as low grade coal by classification according to degree of coalification. At least one of coal, lignite and bituminous coal may be used as the low-grade coal.

Then, a solvent is prepared (S110). For example, the solvent may be at least one selected from the group consisting of coal tar, aromatic solvent and hydrogenated solvent derived from coal.

Thereafter, the crushed coal and the solvent are transferred to a slurry maker, the coal and the solvent are mixed, and the water of the mixture is dried to prepare a slurry (S120). For example, moisture in the mixture can be dried by maintaining the temperature in the slurry maker at a temperature higher than the boiling point of water (1 atm. At 99.97 degrees Celsius) within the range of 30 minutes to 1 hour.

Thereafter, the prepared slurry is transferred to an extraction reactor, and an extraction reaction is performed in a high temperature and high pressure environment (S130). For example, if the prepared slurry is transferred from the slurry producing machine to the extraction reactor and reacted at a temperature in the range of 300-600 ° C. and a pressure of 50 bar or less within the time range of 2 hours or less, the extraction reaction of the component in the slurry proceeds. The curing component is used as a component to increase the strength of the coke and is added to the raw coal during the production of high strength coke.

Thereafter, the substance in a liquid state, which has been subjected to the extraction reaction, is introduced into a separator to separate into a soluble substance and an insoluble substance (S140). For example, after the extraction-completed substance is transferred from the extraction reactor to the separation device, solid-liquid separation is performed using a liquid-phase dissolved substance and a solid-phase insoluble substance by using at least one of gravity sedimentation, centrifugation and filtration.

Thereafter, the dissolved solids separated in the separating apparatus are transferred to a dissolver dryer, and the solubles are dried to produce solvent refined carbon (S150). For example, the solute separated from the separator is transferred to a dissolver dryer, and then the inside of the solubilizer dryer is depressurized or an inert gas such as nitrogen is used to dry the solubilized matter. Thus, Solvent Refined Coal , Hereinafter referred to as SRC).

Thereafter, the insoluble matter separated from the separator is transferred to the insoluble powder dryer, and the insoluble matter is dried to obtain by-products (S160). For example, the dissolved solids separated from the separating apparatus are transferred to a dissolver dryer, and then the interior of the solubilizer dryer is depressurized or insoluble matter is dried using an inert gas such as nitrogen to obtain residues, that is, by-products. The by-products obtained in this step are mixed with the raw coal according to the composition ratio set in the production of coke according to the embodiment of the present invention.

Next, low-level raw coal and by-products according to the embodiment of the present invention will be described.

Low grade raw coal means raw coal classified as low grade by classification according to degree of coalification. Here, as a low-grade raw material, argon, lignite, and bituminous coal may be used. For example, lignite (Brown Caol) is carbonated with peat more carbon black, brown is called brown, and black is called lignite. Component ratio of the brown coal has a component ratio of about 10 to 40 wt% or less fixed carbon 50wt% or less, volatile content 50wt% or less, ash content, heating value of 4,600 kcal / kg or less, only a proportion of the total component ratio compared volatile content greater increases the CO ₂ combustion The flame temperature is low. Generally, lignite is mostly used for domestic or small-scale industrial use because it has high moisture, ash, low calorific value and good oxidation, but has no cohesion, is easy to ignite and burns quickly.

After the production process of the coal-based additive is carried out using the low grade raw coal as the raw material, the obtained by-products and the low grade raw coal used as the raw material of the coal-based additive manufacturing process are subjected to the proximate analysis, Of the total weight of the ash. This is to evaluate which of the byproducts obtained in the coal-based additive manufacturing process using the low-grade coal and the low-grade coal as the raw material contains more alkali component since the ash of each sample contains the alkali component.

Table 1 below shows the results of the constitutional components of each sample derived from industrial analysis of low-grade raw coal and by-products.

division

Fixed carbon (wt%)
Volatile content (wt%)
Ash (wt%)
Raw coal (low grade coal)
45.5
45.0

9.5

by-product

27.1
54.6
12.5

In Table 1, Fixed Carbon is the main ingredient that coal burns. The measurement method means the amount of carbon minus volatile matter, ash and moisture in coal. Fixed carbon is the main cause of heat that burns coal and is the main component of coal.

Volatile matter is a component which helps coal to burn by volatilizing coal. In the measurement method, 1 g of the raw material is put into a platinum crucible, and the percentage obtained by subtracting the moisture content percentage of the raw coal from the weight loss percentage when heating at 925 ± 20 degrees centigrade in an electric furnace for 7 minutes is measured. Generally, coal with high volatile content is good in high temperature, but it is generated quickly, so if the air is not supplied properly, incomplete combustion will occur soot.

Ash (ash) is a remnant of coal, which contains minerals contained in coal. The measurement method is prescribed by KS E 3705, and means remnants contained in coal as a remnant remaining after burning the raw coal at 800 ± 10 ° C for more than 1 hour. In fact, it is slightly less than the weight of the minerals contained in the coal and is not necessarily the same in terms of chemical composition. This is because some components of the coal are vaporized into a gaseous state during the combustion process to become ash.

On the other hand, when the ash content of the coal, that is, the fly ash component, is chemically analyzed, it is possible to use silicon dioxide (SiO ₂ ), iron oxide (Fe ₂ O ₃ ), aluminum oxide (Al ₃ O ₃ ), calcium oxide (CaO), magnesium oxide , Titanium dioxide (TiO ₂ ), tritium oxide (Na ₂ O), and potassium oxide (K ₂ O). The more alkaline components CaO, Fe ₂ O ₃ , Na ₂ O, K ₂ O and MgO are contained in the coal fly ash composition, The melting point of coal is lowered.

Referring to Table 1, by weight of raw coal and by-products, the by-product has a reduced specific gravity of fixed carbon, and the volatile matter and ash are increased. It can be seen that the ash is concentrated in the by-product compared to the raw material. Therefore, it can be seen that by-products contain a larger amount of alkali component than raw materials.

By adding a by-product containing a large amount of the above-described alkali component to the raw coal in the production of coke, a coke having a high reactivity, that is, a low reaction initiation temperature can be produced. For example, an alkali component (K, Ca, etc.) and an alkali oxide (K ₂ O) concentrated in the ash of the by-product described above combine with the carbon dioxide (CO ₂ ) and carbon (C) components in the blast furnace to form carbon monoxide ) To promote the indirect reduction in the blast furnace to lower the temperature of the heat storage zone. Therefore, the reaction initiation temperature of the coke produced by the coke producing method with excellent reactivity according to the embodiment of the present invention is reduced in proportion to the content of by-products added to the raw materials tumbler.

Hereinafter, a coke making process according to an embodiment of the present invention will be described. 2 is a flowchart of a coke making method according to an embodiment of the present invention.

Referring to FIG. 2, a method for manufacturing coke according to an embodiment of the present invention includes a process S200 of preparing a raw material coal, a process S210 of preparing a byproduct, a process S220 of mixing the raw materials and the by- And a by-product are charged into a coke oven and then the mixture is dried to produce a coke (S230). Then extruding the coke produced from the coke oven, although not separately shown, and digesting the extruded gaseous coke by a wet or nitrogen cooling method.

Here, the process S200 for preparing the raw materials and the process S210 for preparing the by-products are not a time-series relationship, and may be performed independently or simultaneously.

In addition, the process S200 of preparing the raw coal may include a process S201 of preparing a raw coal to be used for manufacturing the coke, a process of crushing the raw coal (S202), and a process of adjusting the moisture content of the raw coal (S203) .

The process S210 of preparing a by-product includes a process S211 for preparing a by-product, a process S212 for smashing the by-product, and a process S213 for adjusting the moisture content of the by-product.

Prior to mixing the raw coal and the by-product, the raw material is prepared (S200) and the by-product is prepared (S210). Processes S200 and S2100 for preparing raw coal and by-products include pretreatment processes to be performed on raw coal and by-products before mixing raw coal and by-products to produce coke.

First, the process of preparing the raw coal (S200) will be described. Here, the raw material is a blend containing a plurality of blends, each of which has different volatile content.

In addition, it can be classified into low volatile coal, heavy volatile coal with more volatile content than low volatile coal, and high volatile coal with more volatile content than medium volatile coal, depending on the volatile content.

In addition, the volatile matter weight of each shot has the following range.

Low-volatile coal is a coal having a volatile content of less than 15% by weight based on the total weight of the coal, a medium-volatile coal, a medium-volatile coal, a coal having a volatile content of 15% or more and less than 25% Coal having a volatile content of more than 25 percent by weight.

For example, in the yard of the workplace, various kinds of coal, for example, 10 to 13 kinds of raw materials, such as raw materials, are loaded for producing coke. Here, among the various kinds of raw coal, the raw coal of coke used in the production of coke according to the embodiment of the present invention can be manufactured by mixing 9 types of coal. Three types of low-volatile coal, four volatile coal and two high volatile coal can be used for the nine types of coal used here.

Thereafter, the raw materials are crushed (S202), respectively, so that the particle size is 10 mm, and the particles are crushed so that the fraction of the particles having a particle size of 3 mm or less is 80% to 90%. This is to improve the charging density and the degree of flow when the crushed raw coal is charged into the coke oven. For example, when the particle size of the crushed raw material is more than 10 mm, the voids between the particles and the particles are too large and the charging density is low when charged into the coke oven, which may cause the fluidity to deteriorate. Therefore, in the embodiment, each coal is crushed to make the particle size of the coal 10 mm or less. When each of the nine kinds of raw coal used in the production of coke is crushed and crushed to a proper particle size, the raw coal is stored in each of a plurality of hoppers. In order to produce coke of a certain quality, the mixing ratio of each coal type is calculated, and a certain amount of raw coal is discharged from each hopper on the basis of the blending ratio, and then loaded on the belt. Thus, the raw materials are mixed while traveling on a belt and passing through a chute located on a moving path of the belt, and thus a mixture of plural kinds of raw materials is blended.

As described above, a blend of a plurality of raw materials is referred to as a blend. For convenience of explanation, a blend of a plurality of raw blends is referred to as a raw material blend. Here, the composition of the raw material coal is 15 to 20 wt% of volatile matter, 5 to 10 wt% of ash, and the remainder is fixed carbon and moisture.

After the crushing of the raw materials is finished, the raw materials are heat-treated at a predetermined temperature and dried, and the moisture content is controlled in the drying process (S203). In the embodiment, the raw material coal is adjusted so that the moisture content is 6 wt% to 10 wt%. Such control of the moisture content is intended to improve the flowability of the raw material carbon particles at the time of adding tar, thereby reducing the pores of the raw material carbon particles, thereby increasing the charging density. On the other hand, when the content of water is less than 6 wt%, the water contained in the raw coal is too small, and the flowability and charging density of raw coal particles are poor at the time of adding tar. On the contrary, when the content of water exceeds 10 wt%, the flowability is excessively improved, and there is a problem in that it is not easy to supply raw material coal to a hopper, belt, chute or the like. Therefore, in the embodiment, the content of water contained in each raw material coal is set to 6 wt% to 10 wt%.

Meanwhile, SRC and by-products are produced in the coal liquefaction process. Among them, the by-product contains more alkali component than the alkali component of the raw material carbon. The alkali component has the effect of lowering the temperature of the heat storage zone as described above. Therefore, when the by-products are mixed with the raw coal of the coke, the alkali component of the by-product is added to the alkali component of the raw coal to improve the reactivity of the coke. Therefore, in the present invention, byproducts are added to the raw coal to produce a coke having excellent reactivity.

Hereinafter, the process of preparing a by-product (S210) will be described in detail.

In the embodiment, the process S211 of preparing the by-product during the process S210 of preparing the by-product is the same as the description of FIG. Also, in the step of crushing the by-products (S212), the crushing process is performed under the same conditions as the condition that the raw materials are crushed, and the particle size condition is also the same. That is, it is preferable that the particle size is 10 mm, and the particle size of the particles having a particle size of 3 mm or less is 80% to 90%.

After the by-products are crushed, the product is heat-treated at a predetermined temperature and dried, and the moisture content is controlled in the drying process (S213). The same conditions as those of step S203 described above are performed, so that detailed description is omitted.

When the compounded carbon and various by-products are mixed, the prepared raw materials, that is, the compounded carbon and the by-products are charged into the mixer and mixed (S220). Here, the mixer may include, for example, a container for containing raw coal and by-products, and a rotatable blade installed to be charged into the container. Thus, when the blade rotates, the raw coal and the by-products contained in the container are mixed. Of course, the mixer is not limited to the structure having the above-described blades, and various means capable of mixing raw tar and tar can be used.

When the raw coal and the by-product are mixed, the content of the by-product is made to be 10 wt% or less based on the whole mixture of the raw coal and the by-product. This is because by adding the by-product in an amount exceeding 10 wt%, the physical properties of the produced coke, that is, the physical strength of the final coke produced, can be weakened. Therefore, byproducts are added and mixed in the range of 10 wt% or less, which improves the reactivity of the produced coke and does not affect the physical properties.

Thereafter, the mixture in which the raw coal and the by-product are mixed is charged into the coke oven, and the mixture is transferred to produce a coke having excellent reactivity (S230). For example, when the by-product and the raw coal are mixed, the mixture is charged into a coal bin, a certain amount of the mixture is discharged from the coalbin as a charge, and charged into the coke oven. Thereafter, the mixture is dried in a coke oven to produce a coke, and the coke produced is extruded. The extruded coke is extinguished by wet or nitrogen cooling.

Next, the reaction initiation temperature of the coke having excellent reactivity which is produced by adding a by-product according to an embodiment of the present invention will be described.

In the coke test furnace, by - products obtained from the coal liquefaction process were mixed with raw coal for coke production, and the effect of the coke having excellent reactivity on the initial reactivity and the reaction initiation temperature was evaluated.

Samples are prepared by mixing 9 different types of coal with raw coke. The nine seeds used here are three low volatile coal, four volatile coal and two high volatile coal, which are described in detail above.

First, prepare raw materials for making samples. For example, the method of preparing the raw carbon is the same as the method of preparing the raw carbon described with reference to FIG. Each of the raw materials for making the sample is crushed to have a particle size of 10 mm, and the fraction of the particles having a particle size of 3 mm or less is made 80% to 90%. Preferably, the crushing is carried out so as to maintain the 85% fraction. The reason for this is the same as that described with reference to FIG. That is, when the crushed raw coal is charged into the coke oven, the charging density and the degree of fluidity are improved.

Thereafter, a byproduct for preparing the sample is prepared. For example, the method of preparing the by-product is the same as the process of preparing the by-product described with reference to FIG.

Thereafter, the raw coal and the by-products are transferred to prepare a mixture by a mixer. The mixture was prepared by varying the ratio of the byproduct added to the raw coal.

First, Sample A is a sample prepared by adding 100% by weight of raw materials and 0% by-products, and has a volatile content of 15% or more to 20% or less, ash content of 5% or more to less than 10% .

Second, Sample B is a sample prepared by adding 97% by weight of raw materials and 3% by-product, and has a volatile content of 10% or more and 15% or less, ash content of 10% or more and 15% or less, .

Third, Sample C is a sample prepared by adding 95% by weight of raw materials and 5% by-products, and has a volatile content of 10% or more and 15% or less, ash content of 10% or more and 15% or less, .

Fourth, the sample D is a sample prepared by adding 90% of the specific gravity of the raw material coal and 10% of the by-product, the volatile content is in the range of 10% to 15%, the ash content is in the range of 10% .

The initial reactivity and the reaction initiation temperature of the coke excellent in reactivity according to the embodiment of the present invention to be described below were tested and evaluated for each sample.

Samples prepared with different specific gravity of raw coal and by-products were charged to a dry basis at a constant loading density of 730 kg / m ³ . The coke test used in the experiment was a heater installed in the same way as a commercial coke oven to allow heat transfer from both side walls. After the sample is charged into the test furnace heated to 700 캜, the temperature is raised to 950 캜 at a rate of 2.7 캜 / min and heated. When the center temperature of the sample loaded in the coke test furnace reaches 900 ° C, the extruded coke is extruded after maintaining for 1 hour, and the extruded coke is supplied with a small amount of air from the extinguishing facility to make the temperature of the extinguishing facility 1050 ° C , And then digested and cooled in a nitrogen atmosphere.

The effects of initial coke reactivity and reaction initiation temperature on coke reactivity were evaluated for four samples prepared by the above procedure. Here, the reaction initiation temperature is measured by using a thermo-analyzer (Thermo gravimetry) by making the sample a predetermined particle size (within 1 to 3 mm). The samples were treated with CO: CO2 = 1.5 L: In a 1.5 L atmosphere, the temperature is raised to 1200 캜 at a rate of 5 캜 / min, and the lowest temperature exceeding 0.002 g / min is defined as the reaction initiation temperature.

Table 2 below shows the reaction initiation temperatures measured for cokes prepared by adding the amounts of byproducts extracted from low-grade raw coal to different specific gravity, respectively.

Byproduct Addition (wt%)

Sample A (0 wt%)
Sample B (3 wt%)
Sample C (5 wt%)
Sample D (10 wt%)
Reaction start temperature (캜)

1120 DEG C
1090 DEG C
1086 ° C
1080 ° C

Sample A is a coke to which an additive is not added and has a reaction initiation temperature of 1120 占 폚. On the other hand, sample B is a coke containing 3 wt% of additives and the reaction starting temperature is 1090 캜. When Sample A and Sample B were examined, the difference in content of by-products was + 3 wt%, and the difference in the reaction initiation temperature was -30 ° C.

Sample C is a coke containing 5 wt% of additives and has a reaction start temperature of 1086 캜. When the samples A and C were examined, the difference in content of byproducts was + 5 wt% and the difference in the initiation temperature of the reaction was -34 DEG C. When the samples B and C were examined, the content difference of byproducts was + 2 wt% Respectively.

Sample D is a coke containing 10 wt% of additives, and the reaction starting temperature is 1080 캜. When the samples A and D were examined, the difference in content of byproducts was +10 wt% and the difference in the reaction initiation temperature was -40 DEG C. When the samples B and D were examined, the difference in content of byproducts was + 7 wt% . When the samples C and D were examined, the content difference of the byproducts was + 5 wt% and the difference in the reaction initiation temperature was -5 DEG C.

Therefore, as shown in Table 2, as the content of by-products in the liquefaction process of coal was increased, the reaction initiation temperature was lowered. As a result, it is possible to produce a coke having excellent reactivity by adding by-produced by-products in a coal liquefaction process using low-cost low-grade coal as a raw material, and by using a coke having excellent reactivity, . As the content of by-products increases, the reactivity of the produced coke increases. However, when the specific gravity of the coke having a higher reactivity than that of the coke produced exceeds the static range, That is, physical strength, can be weakened. Accordingly, the specific gravity of the by-product added in the production of the coke may be in the range of more than 0 wt% to 10 wt% of the total specific gravity of the coke. This is to produce a coke having excellent reactivity without changing the physical properties of the coke to be produced. More preferably, the coke finally produced by the coke producing method of the present invention has a range of not less than 3 wt% and not more than 10 wt% in order to ensure excellent reactivity.

Further, the difference in the reaction initiation temperature of the coke produced only from the raw coal and the coke made from the raw coal to which the by-product is added has a range of -30 to -40 degrees. Here, when the error range is set to ± 20 degrees, it has a range of -10 degrees to -60 degrees.

As described above, in the present invention, coal ash is subjected to a liquefaction process on low-grade coal, and by-products, that is, by-products are used in the production of coke. In this case, the by-product is added to the raw coal to improve the reactivity of the coke and the by-product of the produced coke is adjusted to be 10 wt% or less, whereby the coal liquefaction process is carried out on low-cost low- Thereby making it possible to produce a coke having excellent reactivity while being used. Therefore, it is possible to replace high grade coal which is difficult to secure gradually due to the limit of the reserves, and it is possible to produce coke having excellent reactivity. Thus, the cost of coke making is reduced and the productivity is improved.

The embodiments and methods described above can be applied to various coke making processes in addition to steel coke making. While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. It will be understood. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive.

Claims (11)

The process of preparing raw coal;
A process of preparing a byproduct of the coal-based additive manufacturing process;
Crushing the raw char and the by-product;
Preparing a mixture of the raw material crushed and the crushed by-product using a mixer; And
And the mixture is prepared by using a coke oven,
The process for preparing the mixture may include mixing the by-product in an amount of 3 wt% or more to 10 wt% or less based on the total specific gravity of the mixture,
Wherein the by-product contains an alkali component more than the raw material carbon. delete The method according to claim 1,
Wherein the raw material coal is a blend containing a plurality of blends, and each of the blends has different volatile content. The method of claim 3,
Wherein the blended coal comprises low-volatile coal classified according to the volatile content, medium-volatile coal having a larger volatile weight than the low-volatile coal, coke having a higher volatile content than the volatile fraction, Gt; The method of claim 4,
Wherein the low volatile component coal is coal having a volatile content of less than 15 percent by weight based on the total weight of the low volatile component coal, By weight of the high volatile coal, and the volatile matter weight of the high volatile coal is in excess of 25% by weight based on the total weight of the high volatile coal. The method according to claim 1,
The step of preparing the by-
A process of preparing raw coal by crushing and drying low-grade coal;
Preparing a solvent;
Charging the raw material crushed into the slurry producing machine and the solvent, mixing them and preparing a slurry;
Transferring the slurry to an extraction reactor and subjecting the slurry to an extraction reaction;
Separating the extraction-completed material into a soluble component and an insoluble component; And
Transferring the insoluble matter to a drier, and drying the insoluble matter to obtain the by-product;
≪ / RTI > The method of claim 6,
Wherein the low-grade coal comprises at least one of the following: argon, lignite, and bituminous coal. The method according to claim 1,
Wherein the crushing is performed such that the particle size of the raw charcoal and the by-product is 10 mm or less, and the crushed raw material coal and the by-product are crushed so that the particles having a particle size of 3 mm or less are 80% to 90% Gt; coke < / RTI > The method according to claim 1,
Wherein the raw material coal has a volatile content in a range of 15 wt% or more to 20 wt% or less and ash content in a range of 5 wt% or more to 10 wt% or less. The method according to claim 1,
Wherein the coke has a volatile content ranging from 10 wt% or more to 15 wt% or less, and a by-product ranging from 10 wt% or more to 15 wt% or less. The method according to claim 1,
Wherein the reaction starting temperature of the coke has a low temperature within a range of -10 to -60 degrees relative to the reaction starting temperature of the raw material carbon.

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