KR102348980B1 - Method for predicting reduction initiating temperature in a blast furnace using a high strength and high reactivity coke - Google Patents

Abstract

Disclosed is a method for predicting a reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke. In one embodiment, the method for predicting a reduction initiation temperature in a blast furnace through the use of high-strength and highly-reactive coke includes: preparing high-strength and highly reactive coke; Alternatingly charging fuel and raw materials for manufacturing into the inside of the blast furnace reactive simulation device; obtaining data by reacting the raw material for steel and fuel, respectively, by measuring a reduction initiation temperature according to a change in the content of high-strength and highly reactive coke in the fuel; preparing a regression linear equation using the reduction initiation temperature data according to a change in the content of high-strength and highly reactive coke in the fuel; and deriving a reduction initiation temperature prediction equation in the blast furnace from the regression linear equation.

Description

Prediction of reduction initiation temperature in blast furnace through use of high-strength and highly reactive coke

The present invention relates to a method for predicting the reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke.

Coke is a fuel used as a heat source for a blast furnace and serves as a reducing agent for reducing iron ore. Coal used to manufacture coke is called raw coal to distinguish it from general fuel. Coke requires appropriate strength and reactivity to improve air permeability in the furnace.

Recently, in order to reduce the amount of carbon dioxide (CO ₂ ) generated during the ironmaking process, interest in the production of high-strength and highly reactive coke is increasing. High-strength and highly reactive coke is manufactured by heating and distilling coal briquettes including coal and iron ore in a coke oven facility.

The high-strength and highly reactive coke has excellent reactivity in the blast furnace, thereby promoting the reaction of the coke at a low temperature. As a result, the operating efficiency can be increased by reducing the temperature distribution in the blast furnace by about 100 to 200°C, and the reducing agent ratio can be reduced by controlling the gas composition to be oxidative. When the reducing agent ratio is reduced, the amount of coke used is reduced, thereby reducing the amount of carbon dioxide generated.

When it is possible to quantitatively predict the reduction of the distribution temperature in the blast furnace according to the amount of high-strength and highly reactive coke used, it is possible to set the correct reducing agent ratio, thereby contributing to the reduction of carbon dioxide emission. However, there is no method for quantitatively predicting the decrease in the distribution temperature in the blast furnace according to the amount of high-strength and highly reactive coke used.

Background art related to the present invention is disclosed in Korean Patent Application Laid-Open No. 2012-0035946 (published on April 16, 2012, title of the invention: manufacturing method of ferrocoke).

According to an embodiment of the present invention, it relates to a method for predicting the reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke having excellent accuracy and reliability of the predicted reduction initiation temperature of the blast furnace.

According to an embodiment of the present invention, it relates to a method for predicting a reduction initiation temperature in a blast furnace through the use of high-strength, highly reactive coke having excellent eco-friendliness and economical efficiency through reduction of carbon dioxide generation.

One aspect of the present invention relates to a method for predicting the reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke. In one embodiment, the method for predicting a reduction initiation temperature in a blast furnace through the use of high-strength and highly-reactive coke includes: preparing high-strength and highly reactive coke; Alternatingly charging fuel and steelmaking raw materials into the inside of the blast furnace reactive simulation device; obtaining data by reacting the raw material for steel and fuel, respectively, by measuring a reduction initiation temperature according to a change in the content of high-strength and highly reactive coke in the fuel; preparing a regression linear equation using the reduction initiation temperature data according to a change in the content of high-strength and highly reactive coke in the fuel; and deriving a formula for predicting the reduction initiation temperature in the blast furnace from the regression linear formula, wherein the high-strength and highly reactive coke is manufactured by carbonizing coal briquettes including at least one of coal and torrefied biomass and iron ore The reduction initiation temperature is the temperature at which the metal iron content (M.Fe) in the simulation device reaches 10% by weight.

In one embodiment, the reduction initiation temperature prediction equation in the blast furnace may satisfy the relation of Equation 1:

[Equation 1]

Reduction initiation temperature in blast furnace (℃) = 2.9 * A1 + 892.2

(In Equation 1, A1 is the content (% by weight) of high-strength and highly reactive coke in the fuel).

In one embodiment, the high-strength, highly reactive coke may include 65-85 wt% of at least one of coal and torrefied biomass and 15-35 wt% of iron ore.

In one embodiment, the preparing of the high-strength and highly reactive coke includes: preparing coal briquettes using a composition for coke; And carbonizing the coal briquettes; including, wherein the composition for coke is 100 parts by weight of a first mixture comprising 65 to 85% by weight of at least one of the coal and torrefied biomass and 15 to 35% by weight of iron ore, and 1 to 20 parts by weight of the binder, and the binder may include at least one of water glasses and an asphaltenic pitch.

In one embodiment, the torrefied biomass may be prepared by heat-treating the biomass raw material at 100 to 500°C.

When the method of predicting the reduction initiation temperature in the blast furnace through the use of high-strength and highly reactive coke of the present invention is applied, the accuracy and reliability of the predicted reduction initiation temperature of the blast furnace are excellent, and the eco-friendliness and high-strength and high-reactivity coke consumption are minimized by reducing the amount of carbon dioxide generated. This can be done so that the economy can be excellent.

1 shows a method for predicting a reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke according to an embodiment of the present invention.
Figure 2 (a) shows the inside of the blast furnace, Figure 2 (b) is an enlarged view of the blast furnace lump.
3 shows a blast furnace reactive simulator according to an embodiment of the present invention.
4 shows a casing member of a blast furnace reactive simulation device according to an embodiment of the present invention.
5 shows a reaction tube, a heating part, and a temperature measuring part of the blast furnace reactive simulation apparatus according to an embodiment of the present invention.
6 is a graph showing the change in the iron content according to the change in the content of high-strength and highly reactive coke in the fuel.
7 shows a regression linear equation between the change in the content of high-strength and highly reactive coke in the fuel and the reduction initiation temperature.
8 is a RIST operation diagram for deriving an effect according to the input of high-strength and highly reactive coke of the present invention.

Hereinafter, the present invention will be described in detail. In this case, when it is determined that a detailed description of a related known technology or configuration may unnecessarily obscure the gist of the present invention in describing the present invention, the detailed description thereof will be omitted.

And, the terms described below are terms defined in consideration of functions in the present invention, which may vary depending on the intention or custom of a user or operator, and thus definitions should be made based on the content throughout this specification describing the present invention.

Prediction of reduction initiation temperature in blast furnace using high-strength and highly reactive coke

One aspect of the present invention relates to a method for predicting the reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke.

1 shows a method for predicting a reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke according to an embodiment of the present invention. Referring to FIG. 1 , the method for predicting the reduction initiation temperature in the blast furnace through the use of the high-strength and high-reactivity coke includes (S10) preparing high-strength and high-reactivity coke; (S20) fuel and seasonal fuel charging step; (S30) measuring the reduction initiation temperature according to the loading amount of high-strength and highly reactive coke in the fuel; (S40) preparing a regression linear equation; and (S50) derivation of the reduction initiation temperature prediction formula in the blast furnace.

More specifically, the method for predicting the reduction initiation temperature in the blast furnace through the use of the high-strength and highly-reactive coke includes the steps of (S10) preparing high-strength and highly reactive coke; (S20) alternately charging fuel and raw materials for steel making into the inside of the blast furnace reactive simulation device; (S30) reacting the raw material for iron and fuel, and obtaining data by measuring the reduction initiation temperature according to a change in the content of high-strength and highly reactive coke in the fuel; (S40) preparing a regression linear equation using the reduction initiation temperature data according to a change in the content of high-strength and highly reactive coke in the fuel; and (S50) deriving a reduction initiation temperature prediction equation in the blast furnace from the regression linear equation.

The high-strength and highly reactive coke is produced by carbonizing coal briquettes containing at least one of coal and torrefied biomass and iron ore, and the reduction initiation temperature is the metal iron (Metallic Fe, M.Fe) content inside the simulation device. The temperature at which 10% by weight is reached.

Hereinafter, the method for predicting the reduction initiation temperature in the blast furnace through the use of high-strength and highly reactive coke according to the present invention will be described in detail step by step.

(S10) High-strength and highly reactive coke preparation step

The above step is a step of preparing high-strength and highly reactive coke. The high-strength and highly reactive coke is manufactured by carbonizing coal briquettes including at least one of coal and torrefied biomass and iron ore.

In one embodiment, the high-strength, highly reactive coke may include 65-85 wt% of at least one of coal and torrefied biomass and 15-35 wt% of iron ore.

In one embodiment, the preparing of the high-strength and highly reactive coke includes: preparing coal briquettes using a composition for coke; And carbonizing the coal briquettes; including, wherein the composition for coke is 100 parts by weight of a first mixture comprising 65 to 85% by weight of at least one of the coal and torrefied biomass and 15 to 35% by weight of iron ore, and 1 to 20 parts by weight of the binder, and the binder may include at least one of water glasses and an asphaltenic pitch.

Hereinafter, the components of the composition for coke will be described in detail.

(1) coal

As the coal, conventional ones may be used. In one embodiment, the coal may be included in an amount of 45 to 83% by weight based on the total weight of the first mixture. When included in the above range, the hot strength and reactivity of the high-strength and highly reactive coke of the present invention may be excellent.

(2) torrefied biomass

The torrefied biomass is a torrefied biomass raw material, and may serve to replace the coal. The biomass raw material may include cell wall cellulose, hemicellulose, lignin, and the like. The torrefied biomass has a relatively high volatile matter content, and has a lower fixed carbon content than coal.

In one embodiment, the biomass raw material may include at least one of lignocellulosic and herbaceous biomass. In one embodiment, the lignocellulosic biomass may include at least one of sawdust, wood chips, waste wood, and forest by-products. In one embodiment, the herbal biomass is palm kernel shell, coconut shell, rice husk, sorghum, miscanthus, bamboo, reed (phragmites), rice straw (rice straw) and empty fruit bunch (EFB) And it may include one or more of fallen leaves.

In one embodiment, the torrefied biomass may be produced by heat-treating a biomass raw material at 100 to 500°C. Upon heat treatment in the above range, it is possible to prepare torrefied biomass having a high energy density. For example, in the heat treatment, the biomass raw material may be heat-treated at 250 to 350° C. for 20 minutes to 3 hours, for example, 1 hour to 2 hours to produce torrefied biomass.

In one embodiment, the torrefied biomass may be applied in the form of pellets having a size of 5 to 30 mm. The size may mean the maximum length of torrefied biomass in the form of pellets.

In one embodiment, the torrefied biomass may be included in an amount of 2 to 20% by weight based on the total weight of the first mixture. When included in the above range, the hot strength and reactivity of the high-strength and highly reactive coke may be excellent, and the effect of reducing the amount of carbon dioxide generated during the blast furnace process may be excellent. For example, 6 to 20% by weight may be included.

In one embodiment, the sum of at least one selected from the group consisting of coal and torrefied biomass is included in an amount of 65 to 85% by weight based on the total weight of the first mixture. When included in the above range, the hot strength and reactivity of the high-strength and highly reactive coke may be excellent, and the effect of reducing the amount of carbon dioxide generated during the blast furnace process may be excellent. When the sum of at least one or more selected from the group of coal and torrefied biomass is less than 65% by weight, the reactivity of the high-strength, highly-reactive coke is lowered, and when it exceeds 85% by weight, the hot strength of the high-strength and highly reactive coke can be reduced. have.

(3) iron ore

The iron ore (or sintered ore) is a major component to be blended when preparing the high-strength and highly reactive coke, and a conventional one may be used.

In one embodiment, in the first mixture, the sum of the coal and torrefied biomass and the iron ore may be included in a weight ratio of 1:3 to 1:5. When included in the above weight ratio range, the mixability of the composition of the present invention and the hot strength and exothermic properties of the high-strength and highly reactive coke produced may be excellent. For example, it may be included in a weight ratio of 1:3.5 to 1:4.5.

The iron ore may be included in an amount of 15 to 35% by weight based on the total weight of the first mixture. When the iron ore is included in an amount of less than 15 wt%, reactivity and exothermic properties are reduced, and when the iron ore is included in an amount of more than 35 wt%, the strength of the high-strength and highly reactive coke may be reduced. For example, 18 to 25% by weight may be included.

(4) binder

The binder includes at least one of water glasses and an asphaltenic pitch. When the asphaltene pitch is included, the strength and formability of the high-strength and highly reactive coke of the present invention may be excellent.

In one embodiment, the asphaltene pitch, distilling the atmospheric distillation resid generated during refining of crude oil under reduced pressure to obtain a reduced pressure distillation resid; and performing solvent deasphalt on the vacuum distillation resid using a solvent.

For example, crude oil is subjected to atmospheric distillation in the refining process, separated into gas, LPG, naphtha, kerosene, light gas oil, heavy gas oil, and atmospheric distillation resid, and then the atmospheric distillation resid is separated from among these, and is usually a vacuum distillation apparatus can be used for distillation under reduced pressure to obtain a reduced pressure distillation residual oil. Then, the obtained vacuum distillation resid may be subjected to solvent destripping using a solvent to prepare asphaltene pitch.

In one embodiment, the binder is included in an amount of 1 to 20 parts by weight based on 100 parts by weight of the first mixture. When the binder is included in an amount of less than 1 part by weight, the mixability, moldability and strength maintenance effect of the coke composition are reduced, and when the binder is included in an amount exceeding 20 parts by weight, there is no further effect of increasing the coke strength, but rather the hot strength is lowered, or molding sex may be reduced. For example, 5 to 15 parts by weight may be included. For another example, 8 to 13 parts by weight may be included.

When the binder includes the water glasses, the high-strength and highly reactive coke of the present invention may have a low-temperature reduction differentiation ratio (RDI) of 0 and a hot coke strength (CSR) of 70% or more. Furthermore, when the concentration of the water glass in the binder is 75% by weight, the drop strength of the high-strength and highly reactive coke may be 99%.

In one embodiment, the coal briquettes are prepared by homogeneously mixing a composition for coke including the first mixture and a binder and molding it into a predetermined shape; Coal briquettes may be manufactured by preheating the preform.

In one embodiment, the green body may be prepared in the form of a briquette by pressing the composition for coke under a molding pressure of 1 to 10 t/cm.

The heating is for controlling the moisture content and strength of the coal briquettes by controlling the moisture content of the coal included in the high-strength and highly reactive coke composition, and may be performed by a conventional method.

In one embodiment, the drying may be carried out at 1000 ~ 1250 °C. Under the above conditions, high-strength, highly reactive coke having excellent hot strength can be manufactured.

(S20) fuel and seasonal fuel charging step

The above step is a step of alternately charging fuel and raw materials for manufacturing into the inside of the blast furnace reactive simulation device.

Figure 2 (a) shows the inside of the blast furnace, Figure 2 (b) is an enlarged view of the blast furnace lump. Referring to FIG. 2, during operation of the blast furnace, raw materials and fuel are alternately charged into the blast furnace 100, and high-temperature hot air is blown through the tuyere 40 at the bottom of the blast furnace to induce a reduction reaction inside the blast furnace. It can produce molten iron and slag.

Meanwhile, the inside of the blast furnace may be divided into a throat part, a shaft part, a belly part, a boss part, and a hearth part from the upper part. Among them, as shown in FIG. 2( a ), the blast furnace shaft part 30 moves in the lower direction of the blast furnace while the raw materials for steel and fuel charged in layers from the upper part of the blast furnace are heated by the gas rising between the particles.

In one embodiment, sintered ore or iron ore may be used as the raw material for steelmaking, and conventional coke and high-strength and highly reactive coke of the present invention may be used as the fuel.

The present invention is for predicting the fuel reactivity in the blast furnace shaft part 30 (or the blast furnace lump part), and for reference, the actual temperature of the throat part of the blast furnace is about 300 to 400 ° C. The temperature is about 900~1200℃.

In one embodiment, high-temperature carbon monoxide gas is sequentially passed through the raw material layers 10 and 12 and the fuel layer 20 formed by being alternately stacked on the bulk of the blast furnace as shown in FIG. Reactions can be induced to produce molten iron and slag.

3 shows a blast furnace reactive simulator. Referring to FIG. 3, the blast furnace reactivity simulation device is specifically designed to measure the reactivity of the blast furnace mass. Referring to FIG. 3, the blast furnace reactive simulation device includes a casing member 100 in which a plurality of heat generating units are vertically disposed therein; and the casing member 100 vertically penetrates, and iron raw materials and fuel are alternately stacked inside. a reaction tube 200; and a hot air supply connected to the upper portion of the reaction tube to inject hot air into the upper portion of the reaction tube 200 and discharge to the lower portion; and a temperature setting unit 300 for setting the temperature of the heat generating portion; includes

4 shows a casing member of a blast furnace reactive simulation device according to an embodiment of the present invention. The casing member 100 is a member that mimics the appearance of an actual blast furnace, and the casing member 100 of the present invention is an actual blast furnace inverted up and down. goes up and down In an actual blast furnace, raw materials for making steel and fuel fall from the upper part to the lower part, so in order to reproduce the actual blast furnace environment in reverse, the lifting means 110 will have to move the casing member 100 downward during driving of the present invention.

4 shows a casing member of a blast furnace reactive simulation device according to an embodiment of the present invention. As shown in FIG. 4 , through-holes 101 are formed on the upper and lower surfaces of the casing member 100 , and the reaction tube 200 is fitted into these through-holes 101 .

In one embodiment, the casing member 100 has a plurality of heat generating units 120 vertically arranged to reproduce the same operating environment and the same environment as the temperature inside the blast furnace. For example, as shown in FIG. 4 , nine heat generating units 120 may be provided to be divided into 10 zones having different temperatures. Here, the ten zones having different temperatures are eight spaces between the heating units, one space above the heating unit disposed at the highest position, and one space below the heating unit disposed at the lowest position.

5 shows a reaction tube, a heating part, and a temperature measuring part of the blast furnace reactive simulation device. Referring to FIG. 5 , the reaction tube 200 is a tubular member in which steel raw materials and fuel are sequentially stacked up and down. ) and penetrates the casing member 100 up and down. In one embodiment, the raw material for manufacturing is sintered ore and the fuel may include coke (normal coke and high-strength and highly reactive coke of the present invention). The reaction tube 200 causes a reaction sequentially from the sintered ore or iron ore and coke stacked thereunder by the lowering of the casing member 100 .

As shown in FIG. 5 , hot air is introduced into the reaction tube 200 . This hot air is generated by the hot air supply, and the generated hot air is introduced into the upper portion of the reaction tube 200 and discharged to the lower portion. do. The hot air actually serves the same role as the hot air provided to the inside of the blast furnace.

That is, while the hot air is actually supplied from the lower part of the blast furnace and discharged to the upper part of the blast furnace, in the present invention, because the casing member 100 is inverted, the moving direction of the hot air also proceeds from the upper part to the lower part.

The temperature setting unit 300 is a member serving to set the temperature of the heating unit 120 installed in the interior of the above-described casing member 100 , and this temperature setting unit 300 is inside the casing member 100 . The temperature of the heating part 120 is set so that the environment of the actual blast furnace matches the inverted state of the shaft part of the blast furnace.

Accordingly, the temperature setting unit 300 sets the temperature of the heating unit 120 to be the highest at the upper part and the lowest at the lower part.

If the temperature of the heating unit 120 is set to the highest in the lower part and the lowest in the upper part as described above, it is not possible to accurately set the temperature because it is affected by the radiant heat radiated from the lower heating part 120 to the upper side. because it does

As described above, the inside of the casing member 100 may be divided into a plurality of zones by the temperature by the heat generating unit 120 set to a different temperature.

For example, the heating unit 120 disposed at the highest position is set to 1200° C., and the heating unit 120 disposed at the lowest position is set to 400° C., but with respect to the heating unit 120 located at a high place, the The heat generating unit 120 may be set to be 50 to 100°C lower.

In one embodiment, the blast furnace reactive simulation device may further include a temperature measuring unit 400 disposed up and down inside the casing member 100 or outside the reaction tube 200 to measure the temperature.

In one embodiment, a plurality of thermometers 410 may be vertically disposed inside the casing member 100 or outside the reaction tube 200 as shown in FIG. 5 . By measuring the temperature at the point where the zone is set for each temperature by the heat generating unit 120 via the thermometer 410, it can be known whether the inside of the casing member 100 is set the same as the actual shaft part of the blast furnace. do.

The thermometer 410 as described above is disposed in close contact with the outer periphery of the reaction tube 200 so that the correct temperature value is measured, and it is preferable that a plurality of thermometers 410 be installed up and down, and the value measured by the thermometer 410 is shown in FIG. It is transmitted to the temperature measuring unit 400 shown in , the measured value can be checked in real time.

(S30) Reduction initiation temperature measurement step according to the loading amount of high-strength and highly reactive coke in fuel

The step is a step of obtaining data by respectively measuring the reduction initiation temperature according to a change in the content of high-strength and highly reactive coke in the fuel, but reacting the raw material for steel and the fuel.

The reduction initiation temperature can be easily derived by a person skilled in the art. In one embodiment, the reduction initiation temperature may be measured by measuring the content of metallic iron (Metallic Fe, M.Fe) inside the simulation device, and measuring the temperature at which the metallic iron content reaches 10% by weight. In the present invention, it is possible to determine the degree of reduction of iron ore among the fuel and iron-making raw materials through metallic iron (Metallic Fe, M.Fe) inside the simulation device. When the reduction of the fuel is set to start at the temperature at which the metallic iron content reaches 10 wt%, the accuracy and reliability of the reduction initiation temperature prediction formula in the blast furnace of the present invention may be excellent.

For example, the fuel may measure the reduction initiation temperature while increasing the content of high-strength and highly reactive coke.

In one embodiment, the steel raw material and fuel are reacted under conditions of temperature: 400 ° C to 1200 ° C, carbon monoxide gas partial pressure (pCO): greater than 0 and less than 0.1 atm, and partial pressure of hydrogen gas (pH ₂ ): greater than 0 and less than or equal to 0.1 atm can When the reaction is carried out under the above conditions, the reaction can be performed under conditions similar to the actual inside of the blast furnace, so that it is possible to derive the carbon monoxide and hydrogen gas utilization rate prediction equations with better accuracy and reliability. For example, the steel raw material and fuel are heated at a temperature of 400° C. to 1200° C., carbon monoxide gas partial pressure (pCO): greater than 0 and less than or equal to 0.1 atm, and partial pressure of hydrogen gas (pH ₂ ): greater than 0 and less than or equal to 0.1 atm for 6 hours. can be reacted during

In addition, the gas after the reaction has been completed may be discharged through a gas outlet to measure the compositional change through a mass spectrometer.

(S40) Regression straight line formula preparation step

The step is a step of preparing a linear regression equation using the reduction initiation temperature data according to a change in the content of high-strength and highly reactive coke in the fuel.

(S50) Reduction initiation temperature prediction formula derivation step in the blast furnace

The step is a step of preparing a linear regression equation using the reduction initiation temperature data according to a change in the content of high-strength and highly reactive coke in the fuel.

The reduction initiation temperature prediction equation in the blast furnace may satisfy the relation of Equation 1 below:

[Equation 1]

Reduction initiation temperature in blast furnace (℃) = 2.9 * A1 + 892.2

(In Equation 1, A1 is the content (% by weight) of high-strength and highly reactive coke in the fuel).

When the method of predicting the reduction initiation temperature in the blast furnace through the use of high-strength and highly reactive coke of the present invention is applied, the accuracy and reliability of the predicted reduction initiation temperature of the blast furnace are excellent, and the eco-friendliness and high-strength and high-reactivity coke consumption are minimized by reducing the amount of carbon dioxide generated. This can be done so that the economy can be excellent.

Hereinafter, the configuration and operation of the present invention will be described in more detail through preferred embodiments of the present invention. However, this is presented as a preferred example of the present invention and cannot be construed as limiting the present invention in any sense.

Example

(1) Preparation of high-strength and highly reactive coke: Herbal biomass was heat-treated at 100-500° C. to prepare torrefied biomass. Then, 45 to 83% by weight of coal, 2 to 20% by weight of the torrefied biomass, and 15 to 35% by weight of iron ore 100 parts by weight of a first mixture and 1 to 20 parts by weight of a binder (including asphaltene pitch) After the coal briquettes were manufactured by molding the composition for coke containing the coal briquettes, high-strength and highly reactive coke was manufactured by carbonizing the coal briquettes.

(2) Derivation of the reduction initiation temperature prediction formula in the blast furnace: Raw materials for making iron (sintered ore) and fuel were alternately charged into the casing member of the reactive simulation device of the blast furnace as shown in FIG. At this time, the fuel reacts with the raw material for steel and the fuel while increasing the amount of normal coke and the high-strength and highly reactive coke to 0 wt%, 10 wt%, 20 wt% and 30 wt%, to form metallic iron inside the simulation device (Metallic Fe, M.Fe) was measured, and the reduction initiation temperature at the time when the metallic iron content reached 10 wt% was measured to obtain data.

Then, a regression linear equation was prepared using the reduction initiation temperature data according to the change in the content of high-strength and highly reactive coke in the fuel, and a reduction initiation temperature prediction equation in the blast furnace was derived from the regression linear equation.

6 is a graph showing the change in the iron content according to the change in the content of high-strength and highly reactive coke in fuel using the blast furnace reactivity simulation device of the present invention. In FIG. 6, the reduction initiation temperature change amount was derived based on the reduction initiation temperature when the metallic iron content reached 10% by weight and the reduction initiation temperature not including the high-strength, highly reactive coke of the present invention in the fuel. Table 1 shows.

High-strength and highly reactive coke content in fuel (wt%) Reduction initiation temperature (℃) Reduction start temperature
(Δ℃) 0 893.45 - 10 860.14 33.31 20 836.79 56.74 30 804.588 88.86

Referring to the results of FIG. 6 and Table 1, it can be seen that the reduction initiation temperature decreases when the content of the high-strength and highly reactive coke of the present invention is increased.

7 shows a regression linear equation between the change in the content of high-strength and highly reactive coke in the fuel and the reduction initiation temperature. Referring to FIG. 7, it can be seen that the relationship shown in Equation 1 is satisfied between the change in the content of high-strength and highly reactive coke in the fuel and the reduction initiation temperature:

[Equation 1]

Reduction initiation temperature in blast furnace (℃) = 2.9 * A1 + 892.2

(In Equation 1, A1 is the content (% by weight) of high-strength and highly reactive coke in the fuel).

Referring to FIG. 7 , in Equation 1 through the regression linear equation, R ² =0.9958, it can be seen that a high correlation can be obtained between the change in the content of high-strength and highly reactive coke in the fuel and the reduction initiation temperature.

The effect of the method for predicting the reduction initiation temperature in the blast furnace through the use of high-strength and highly reactive coke, derived according to the present invention, was calculated. The RIST operation diagram is a visual representation of the equilibrium relationship between oxygen, carbon and iron (Fe) in the blast furnace according to the operation conditions of the blast furnace.

8 is a RIST operation diagram for deriving an effect according to the input of high-strength and highly reactive coke of the present invention. In FIG. 8, W is the Fe-Fe0 equilibrium point, and P is the rotation center point of the operation line according to the impurity reduction reaction in the furnace. Also, point A is assumed to be air volume: 7000 Nm ³ /min, oxygen enrichment amount: 30000 Nm ³ /hr, coke ratio: 320 kg/THM, and pulverized coal ratio 180 kg/THM.

Referring to FIG. 8, when moving from point A to point B (including 20 wt% of high-strength and highly reactive coke in fuel), the heat storage zone temperature decreased from 1100° C. to 1043° C. kg/THM and carbon dioxide reduction: It was found to have an effect of 113,659 tons/year.

As such, when the predicted value of the reduction start temperature through the use of high-strength and highly reactive coke derived according to the present invention is applied, the accuracy and reliability of the predicted reduction start temperature of the blast furnace are excellent, and the eco-friendliness by reducing the amount of carbon dioxide generated is excellent, and the blast furnace It can be seen that the reducing agent ratio reduction effect is excellent, and through this, the blast furnace blowing conditions can be easily designed.

Simple modifications or changes of the present invention can be easily carried out by those of ordinary skill in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

10: steel raw material layer 12: iron raw material layer
20: fuel layer 30: shaft part
40: tuyere 100: casing member
101: through hole 110: elevating means
120: heating part 200: reaction tube
300: temperature setting unit 400: temperature measuring unit
410: thermometer 1000: blast furnace

Claims (5)

preparing high-strength and highly reactive coke;
Alternatingly charging fuel and raw materials for manufacturing into the inside of the blast furnace reactive simulation device;
obtaining data by reacting the raw material for steel and fuel, respectively, by measuring a reduction initiation temperature according to a change in the content of high-strength and highly reactive coke in the fuel;
preparing a regression linear equation using the reduction initiation temperature data according to a change in the content of high-strength and highly reactive coke in the fuel; and
Including;
The high-strength and highly reactive coke is produced by carbonizing coal briquettes including at least one of coal and torrefied biomass and iron ore,
The reduction initiation temperature is the temperature at which the content of metallic iron (Metallic Fe, M.Fe) in the simulation device reaches 10 wt% .
According to claim 1,
The reduction initiation temperature prediction formula in the blast furnace is a method for predicting the reduction initiation temperature in the blast furnace through the use of high-strength and highly reactive coke, characterized in that it satisfies the relation of Equation 1 below:
[Equation 1]
Reduction initiation temperature in blast furnace (℃) = 2.9 * A1 + 892.2
(In Equation 1, A1 is the content (% by weight) of high-strength and highly reactive coke in the fuel).
According to claim 1,
The high-strength and high-reactivity coke comprises 65 to 85% by weight of at least one of coal and torrefied biomass and 15 to 35% by weight of iron ore.
According to claim 1,
The step of preparing the high-strength and highly reactive coke comprises:
preparing coal briquettes using the composition for coke; and carbonizing the coal briquettes;
The composition for coke comprises 100 parts by weight of a first mixture comprising 65 to 85% by weight of at least one of coal and torrefied biomass and 15 to 35% by weight of iron ore and 1 to 20 parts by weight of a binder,
The binder is a method for predicting reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke, characterized in that it comprises at least one of water glasses and an asphaltenic pitch.
According to claim 1,
The torrefaction biomass is a method for predicting reduction initiation temperature in a blast furnace through the use of high-strength and highly reactive coke, characterized in that it is produced by heat-treating a biomass raw material at 100 to 500°C.

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