KR100412225B1 - Apparatus for manufacturing an iron mine sinter and method of it - Google Patents

Abstract

The present invention relates to an apparatus and method for producing iron ore sintered ore, which is a charge of steel blast furnace, in the ignition of a blended raw material for the production of sintered ore, by reducing the thermal shock of the surface portion of the bogie to prevent the destruction of pseudo-particles, anti-spray generation and anti The purpose of the present invention is to reduce the quantity of light and to improve the external competitiveness due to the increase in the recovery rate.

In order to achieve the object of the present invention, to preheat the structure of the high temperature ignition furnace in multiple stages in accordance with the transport direction of the trolley, the preheat burner chamber for preheating the first stage at 70 to 170 ℃ temperature, and the second preheating at 360 to 550 ℃ temperature A chamber comprising an auxiliary burner chamber and a main burner chamber for final ignition of fuel at a temperature of 1,150 to 1,200 ° C is provided. This structure preheats and ignites the compound material surface layer to mitigate thermal shock of the raw material of the balance surface layer to prevent destruction of pseudoparticles.

Description

Apparatus for manufacturing an iron mine sinter and method of it}

The present invention relates to an apparatus and method for producing iron ore sintered ore, which is a charge of a steel blast furnace, in particular, to relieve thermal shock of the surface layer portion of the raw material generated during rapid sintering in a high-temperature ignition furnace after charging the raw material for sintering in a bogie at room temperature, The present invention relates to an apparatus and a method for producing the sintered ore.

In general, the most widely used sintering method for the bulking of the iron ore is made in the following manner, which will be described with reference to the accompanying drawings.

1 is a sintering process diagram showing a general sintered ore manufacturing process,

2 is a perspective view showing a conventional compounding material ignition device.

As shown in the figure, the sintering method is a DL type continuous sintering method suitable for mass production, and the raw materials such as iron ore of less than 8 mm and the raw materials such as limestone, silica sand, serpentine, quicklime, and fuels such as buncocos and anthracite are mixed at a constant ratio. Water is added and mixed in the drums 101 and 102, and the mixed raw material treated with pseudo granulation (attached fine particles around the nucleus particles having large particle diameters) is charged to the balance 108 one by one in order after a predetermined layer. And the inside of the ignition furnace 105 fixed by passing through the cart 108 is ignited.

However, the blended raw materials transported by this process are usually affected by the ambient temperature and usually show about 40 ° C. in summer, and are charged at about 10 ° C. in winter.

Rotate the blended raw material stored in the raw material storage hopper 103 at the above-mentioned temperature with the drum-type cutting machine 109 and load it into the trolley 108, and then by an appropriate mixing ratio of air and coke oven gas (Coke Oven Has). The trolley 108 ignites the surface layer compounding material by the single-seat ignition furnace 105 of the high temperature of 1,200 degreeC or more which burned out, and it burns by the big air blower 107a, 107b through the air phase installed in the lower part of the trolley 108, and fires. Will be done.

However, surface spectroscopy at the surface temperature of 10 to 40 ° C suddenly contacted with a high temperature of 1,200 ° C, causing microscopic spectroscopy, or pseudo-particles, to be attached by the nuclear particles. There was a problem that the sinter recovery rate is reduced due to the increase in the amount of semi-glossy to reduce the competitiveness of external prices.

Thus, various technical means have recently been proposed to reduce the occurrence of fine spectroscopy at the surface layer of the trolley 108. To date, there is no technical means applied to mitigation of thermal shock at the surface of the sintered ore manufacturing process in Korea, but recently known method is to produce the boiler steam using waste heat obtained after sintered ore light distribution, and then heat the secondary waste gas emitted before ignition In recent years, a method of using a method has been proposed in Japan.

However, the preheating method before ignition of the surface portion of the trolley 108 is usually generated at about 150 ° C., which can reduce the raw unit of used gas (Gas), but it can be seen that there is a limit in preventing the destruction of pseudo particles. This is because, first of all, the difference between the ignition temperature is so large that it is difficult to reduce the amount of fines by reducing the surface thermal shock.

Therefore, the present invention is to solve the conventional problems as described above, an object of the present invention in the complexation of the surface layer portion of the compounding material for sintering, by reducing the thermal shock of the balance surface layer portion to prevent the destruction of pseudo particles, the generation of fine spectroscopy The present invention provides an apparatus and method for manufacturing iron ore sintered ore that can reduce the amount of semi-mineral and improve the external competitiveness by increasing the recovery rate.

1 is a sintering process chart showing a general sintered ore manufacturing process,

2 is a perspective view showing a conventional compounding material ignition device,

3 is a perspective view showing a compound material thermal shock mitigation device according to the present invention,

Figure 4 is a schematic diagram showing the configuration of a control unit for controlling the temperature measured in the ignition furnace of the thermal shock mitigation device of the sintered raw material according to the present invention,

5 is a graph showing a comparison of the effects of air permeability according to the firing time of the blended raw materials in the prior art and the technique of the present invention;

6 is a flow chart showing a manufacturing process for mitigating the thermal shock of the raw material in the iron ore sintered ore manufacturing apparatus according to the present invention,

7 is a graph showing the temperature change according to the ignition process of the blended raw material according to the present invention,

8 is a graph showing the experimental results in the embodiment of the present invention.

<Description of Symbols for Main Parts of Drawings>

100: raw material storage bin 101,102: drum 103: compound material storage hopper 105: ignition furnace

108: sintering machine cart 109: drum type cutting machine

110: deflection plate 201: main burner chamber

202,203: auxiliary burner chamber 204,205: preheating chamber 206: temperature detection sensor 214: thermal insulation chamber

212a, 212b, 213a, 213b: Gas Burner

Iron ore sintered ore manufacturing apparatus of the present invention to achieve the above object,

Located in the upper part of the trolley in which the compounding material is charged, the temperature pretreatment process is carried out in multiple stages along the conveying direction of the trolley, and the preheat burner chamber is preheated to a temperature of 70 to 170 ° C. before ignition of the ignition furnace, and 360 to 550 ° C. An ignition furnace comprising an auxiliary burner chamber for preheating secondary to a temperature, a main burner chamber for igniting the final fuel at a temperature of 1,150 to 1,200 ° C., and a heating chamber located in the vicinity of the main burner chamber to gradually lower the temperature in the ignition furnace; A burner installed in each chamber to maintain an appropriate temperature in the chamber with each ignition furnace; A temperature sensing sensor unit provided on each ignition chamber to detect a temperature in each ignition chamber; It is configured to include a control unit for adjusting the temperature in the ignition furnace measured, characterized in that to prevent the occurrence of micro-spectral of the raw material of the surface layer portion.

In order to achieve the above object, the present invention is a method of manufacturing iron ore sintered ore, which is a charge of the steel blast furnace, in the first preheating chamber at a temperature of 70 to 170 ℃ in the first stage before ignition in the ignition furnace of the main burner chamber Preheating; Preheating at a temperature of 360 to 550 ° C. in a second preheating chamber adjacent to the first preheating chamber in a second step; And final ignition of the fuel at a temperature of 1,150 to 1,200 ° C. in the main burner chamber, characterized in that it prevents the destruction of pseudoparticles at the surface layer of the blended raw material.

Hereinafter, a method of manufacturing iron ore sintered ore according to the present invention with reference to the accompanying drawings will be described in detail.

3 is a perspective view showing an apparatus for producing a sintered ore to reduce the thermal shock of the blended raw material according to the present invention, Figure 4 is a configuration of a control unit for controlling the temperature measured in the ignition furnace of the thermal shock mitigation device of the sintered raw material according to the present invention As shown in FIG. 3, the apparatus for producing a sintered ore capable of alleviating the thermal shock of the sintered raw material of the present invention is located at the upper portion of the trolley 108 into which the blended raw material is charged. A plurality of ignition furnaces 201, 202, 203, 204 and 205 separated by a multi-stage partition wall having a predetermined length along the moving direction of the trolley 108 for the multi-stage temperature raising process; A temperature sensor unit having a temperature detection sensor (206, 207, 208, 208, 210) installed on each of the ignition furnaces (201, 202, 203, 204, 205) to detect the temperature in each of the ignition furnaces (201, 202, 203, 204, 205); And a control unit for adjusting the temperature in each of the ignition furnaces 201,202,203,204,205.

6 is a view showing a work flow for mitigating the thermal shock of the compound material surface layer portion according to the present invention.

Referring to the overall drawings, in particular with reference to Figures 3 and 6 and 4 will be described in detail the thermal shock mitigation method of the raw material of the present invention in detail.

First, after loading the blending raw material into the cart 108 by the rotation of the drum-type extruder 109, and then proceeds to the cart 108 in order to 70 ~ 170 ℃ or less in the primary and secondary preheating chamber (204, 205) Maintain the temperature to move the cart 108 by a certain distance.

Thereafter, in the auxiliary burner chambers 202 and 203 adjacent to the primary and secondary preheating chambers 204.205, the mixture is preheated at a temperature of 360 to 550 ° C., and then 1,150 in the final main burner chamber 201. The surface layer portion of the blended raw material loaded on the trolley 108 is maintained at ˜1,200 ° C. to complex.

On the other hand, gas burners 211a, 211c, 212a, and 213a are installed in each chamber to maintain the step-by-step temperature in each ignition furnace, and the temperatures of the main burner chamber 201 and the auxiliary burner chambers 202 and 203 are respectively provided. Measurement is performed by temperature detection sensors 206 to 208 inserted into the chambers.

The temperature value measured in each chamber is applied to the control system (FIG. 4), and if the driver does not meet the preset value on the screen 305, the temperature value set by adjusting the gas control valves 301 and 302 immediately. To control continuously.

On the other hand, it is preferable to perform the operation of maintaining the heat retaining 400 ~ 500 ℃ in the heat storage chamber (214,215) by a certain distance after the ignition.

Therefore, the present invention prevents destruction of pseudo particles due to thermal shock relaxation of the raw material of the balance layer 108, thereby increasing the effective air volume by increasing the porosity of the raw material, and sintering quality (falling strength, fraction) according to the decrease of the surface layer spectroscopy. Index)) and the practical effect of increasing the recovery rate is obtained.

Hereinafter, the present invention will be described in more detail with reference to Examples.

First, in the present invention, the temperature of the preheating chambers 204 and 205, the auxiliary burner chambers 202 and 203 and the heating chambers 214 and 215 in ignition before ignition was optimized to examine the average particle for the thermal shock change of the compound material surface layer portion.

As a result of the change in the preheating temperature in the preheating chambers 204 and 205 to the auxiliary burner chambers 202 and 203 and the holding chambers 214 and 215, it was found that the recovery rate was improved during the sintering manufacturing process. ) We examined the temperature range in which auxiliary particles are not destroyed by preheating the staged surface layer in auxiliary burner chambers (202, 203) through a number of experiments and applied them to the sintering process.

(Example 1)

It is necessary to adjust the preheating temperature appropriately according to the moisture of the blended raw materials used in the sintering operation, but the moisture of the blended raw materials used in the sintering operation is almost constant in the range of 6.5 ~ 7.0% except the rainy season. It was confirmed.

(Example 2)

Limestone, silica sand, serpentine, subsidiary materials of quicklime and the like in the iron ore used in the production of sintered ore for the present invention are shown in Table 1 below. That is, Table 1 below is a chart showing the average particle size of the pseudo-particles of the surface of the blended raw material according to the conventional method and the complexing method of the present invention.

(Table 1) Compounding ratio of sintered raw material (%)

B.O S, .L S.E L.S B.L.M 84.80 0.72 1.37 11.62 1.49

In addition, the operating conditions tested in the actual sintering operation using the blended raw materials are shown in Table 2 below. That is, the following (Table 2) is a chart showing the operation effect before and after the conventional method and the present invention.

(Table 2) Conditions for sintering operation

Compound ingredient moisture (%) Sintered filling (mm) Ignition temperature (℃) Sinterer Speed (m / mn) Negative pressure (mmAq) 6.5-7.0 650 1,200 3.0 1,900

In order to confirm the effects of the present invention, as shown in the following (Table 3), the experiment was performed without preheating the conventional compound material surface layer portion as a reference example, preheating the surface layer portion before ignition in 1 to 2 stages to improve the average particle size and air permeability The results of the investigation are shown in the examples.

In the above embodiment, the borosilicate and the blended water content fractions are 650 mm and 6.8 ± 0.2%, which are the same as those of the reference example, and in the first stage of preheating, the temperature of each stage is applied to the ignition furnace to sample the surface layer immediately before ignition. 3) is shown.

Table 3 Table of average particle size of compounding raw materials by preheating step 1 of the present invention

Reference example Temperature 30 ± 10 ℃, Average Particle Size 2.71mm division TENS1 TENS2 TENS3 TENS4 TENS5 Preheating stage 1 temperature (℃) 10 20 30 40 50 Average particle size (mm) 2.69 2.72 2.73 2.74 2.74

division TENS6 TENS7 TENS8 TENS9 TENS10 Preheating stage 1 temperature (℃) 60 70 80 90 100 Average particle size (mm) 2.75 3.24 3.37 3.52 3.54

division TENS11 TENS12 TENS13 TENS14 TENS15 Preheating stage 1 temperature (℃) 110 120 130 140 150 Average particle size (mm) 3.65 3.78 3.79 4.02 4.04

division TENS16 TENS17 TENS18 TENS19 TENS20 Preheating stage 1 temperature (℃) 160 170 180 190 200 Average particle size (mm) 4.07 3.95 2.84 2.75 2.71 In addition, the result of aeration to measure the amount of fine spectroscopy after ignition and operation in the ignition furnace by applying a step-up temperature based on the optimum temperature obtained in step 1 of the preheating is shown in the following (Table 4).

Table 4 Experimental table of air permeability by two stages of preheating of the present invention

Reference example Breathability 48.24 (N㎥ / min), particle size 2.71 (mm) division TENS1 TENS2 TENS3 TENS4 TENS5 Preheating stage 1 temperature (℃) 150 180 210 240 270 Breathability (N㎥ / min) 48.31 48.53 48.66 49.12 49.24

division TENS6 TENS7 TENS8 TENS9 TENS10 Preheating stage 1 temperature (℃) 300 330 360 390 420 Breathability (N㎥ / min) 49.39 49.79 53.24 55.27 56.51

division TENS11 TENS12 TENS13 TENS14 TENS15 Preheating stage 1 temperature (℃) 450 480 510 540 570 Breathability (N㎥ / min) 59.24 60.11 61.27 61.25 59.25

division TENS16 TENS17 TENS18 TENS19 TENS20 Preheating stage 1 temperature (℃) 160 170 180 190 200 Breathability (N㎥ / min) 58.11 56.55 50.27 49.24 49.13

In addition, as a result of the above, the average particle size was improved in the range of 70 to 170 ° C. in the first stage of preheating, and the air permeability was improved in the range of 360 to 550 ° C. in the second stage of preheating, as shown in Table 5 below. have.

(Table 5) Comparison table of operation effect before and after the conventional method and the present invention

division Conventional Law Invention Remarks Pseudoparticle Average Particle Size (mm) 2.71 3.72 Breathability (N㎥ / min) 48.27 58.13 Productivity (T / D㎡) 31.4 32.8 Drop strength (%) 91.2 92.1 Fraction (%) 29.3 28.5

On the other hand, Figure 7 is a graph showing the temperature change according to the ignition process of the blended raw material according to the present invention, Figure 8 is a graph showing the experimental results in the embodiment of the present invention.

As described above, the manufacturing technology of the iron ore sintered ore, which is the charge of the steelmaking blast furnace according to the present invention after charging the raw material for the production of sintered ore into the trolley, and proceeds the trolleys sequentially below a certain temperature in the first and second preheating chamber. After maintaining at a temperature of, the secondary burner chamber maintains a temperature higher than the preheated temperature step by step, and preheating and complexing the compound material surface layer to the ignition temperature of the final fuel, to mitigate the thermal shock of the compound material of the balance surface layer portion of the pseudo particle It is possible to prevent breakage and to improve the sintering quality and the recovery rate by decreasing the surface layer spectroscopy.

Claims (1)

In the iron ore sintered ore manufacturing apparatus, Preheat burner chamber located in the upper portion of the trolley 108 into which the blended raw material is charged and heated in multiple stages along the conveying direction of the trolley 106, but preheating one stage to a temperature of 70 to 170 ° C before ignition. (204, 205) and auxiliary burner chambers (202, 203) for secondary preheating at a temperature of 360 to 550 캜; A main burner chamber 201 for igniting the final fuel at a temperature of 1,150 to 1,200 캜; And an ignition furnace, located in the vicinity of the main burner chamber 201, comprising an insulation chamber 214, 215 for gradually lowering the temperature in the ignition furnace. A burner installed in each chamber to maintain an appropriate temperature in the chamber with each ignition furnace; A temperature sensing sensor unit provided on each ignition chamber to detect a temperature in each ignition chamber; An iron ore sintered ore manufacturing apparatus having a configuration including a control unit for adjusting the temperature in the measured ignition furnace, to prevent the generation of fine spectroscopy of the surface raw material mixture.