KR20010002171A - Method for preventing formation of coating sinter in furnace - Google Patents

Abstract

PURPOSE: A method is provided, for preventing the generation of fused rock in the inside of an ignition furnace in the sintering process, to improve the productivity, and the lifetime of an ignition furnace. CONSTITUTION: An air spray nozzle(19) is set in the upper inside of an ignition furnace(7) by using a support base(20)and flange(21a); an air blower(15) is connected to the air spray nozzle(19) through a pipe line(15a), and flux controlling valves(15b,15d) and a pressure gauge(15c) are set in the pipe line(15a), to spray air into the ignition furnace(7) through the pipe line(15a) and the air spray nozzle(19) from the air blower(15) in the complexation of source material surface due to a burner; and cold air is allowed to flow into the pipe line(15a) and the air spray nozzle(19) after the complexation, to prevent fused rock from being generated at the terminal of an ignition furnace(7).

Description

METHODS FOR PREVENTING FORMATION OF COATING SINTER IN FURNACE}

The present invention relates to a method for preventing the fusion of the fusion light at the inner end of the sintered ore ignition in the manufacture of sintered ore, in particular, by sintering to produce a sintered ore by blowing air to the portion to which the fusion light is fused sintering In operation, the present invention relates to a method for preventing fusion furnace internal fusion light generation.

In general, the sintering operation of manufacturing the sintered ore is stored in ore bin (ore) of the powdered iron ore and secondary raw materials and coke (ore bin) as shown in Figures 1 and 2 and then cut out a certain amount of drum mixer (drum) After mixing and mixing with water in the mix 2) and storing it in a surge hopper 3, raw materials and coke stored in the surge hopper 3 are cut out by a drum feeder 4 and sintered (8). ) And ignition the upper part of the charging raw material (13) with a flame of high temperature (about 1,200 ℃) in the sintering ignition furnace (7), the main blower (9) and the gas main duct (6) and It is a pre-treatment process of raw material which makes it easy to operate by improving the air permeability inside the blast furnace by supplying it to the blast furnace by inhaling high temperature baking and powdered iron ore after inhaling the wind box (5) into the lower part. That is, the speed of the drum feeder 4 is controlled in accordance with the detection signal of the post-layer detection rods 10a and 10b in which the blended raw material of the surge hopper 3 is installed in the sintering machine 8. When the raw ore slides to the deflector plate 11 by the rotation of the drum feeder 4 by a predetermined height, is charged into the sintering machine 8 and then proceeds to the ignition furnace 7 when the ignition furnace 7 The raw ore whose surface is complexed by the upper burner (12) flame is sucked by the main blower (9), the gas main duct (6) and the wind box (5).

However, the conventional operation of manufacturing such a sintered ore has a problem in that the ore on the sintering machine 8 is scattered by the flame of the burner 12 and the raw material ore is attached to the inner end of the ignition furnace 7 to be fused. .

The generation of fused light in the ignition furnace 7 causes scratches on the inner surface of the ignition furnace 7 to not only deteriorate the quality of the sintered ore but also to suppress the generation of fused light at the inner end of the ignition furnace 7. Reduced productivity due to the operation of the sintering machine 8 during the suppression and removal of the fused light and the shortening of the service life of the ignition furnace 7 due to the impact in the ignition furnace 7 during the fusion furnace removal operation, the worker due to the surrounding rotor and high heat There was a problem that increased the work load and risk of safety accidents.

The present invention has been invented to solve the various problems caused by the production of fusion in the ignition furnace caused by the conventional sintered ore, the sintering furnace ignited by the raw material scattered on the sintering machine by the burner flame in the ignition furnace during the sintering operation In order to prevent scratches on the inner surface of the ignition due to the occurrence of fusion light at the inner end, blow air to prevent fusion light at the time of ignition to prevent the occurrence of fusion light to suppress the occurrence of scratches on the inner surface of the ignition by sintered ore The purpose of the present invention is to provide a method for preventing the formation of internal fusion light in the sintering operation in the sintering operation that prevents the worker's work load reduction and safety accidents due to the improvement of the quality and productivity and the removal of the fusion light.

1 is a view for explaining a sintering process,

2 is a cross-sectional view of an ignition furnace showing a state in which a raw material is charged to the sintering unit,

3 is a view showing a direct type ignition furnace,

4 is a plan view showing a main portion of the fusion ignition end melting light,

5 is a side cross-sectional view of the ignition furnace site showing the formation position of the fused light;

6 is a front sectional view of an ignition furnace provided with an air spray nozzle employed in the present invention;

7 is a side cross-sectional view of an ignition furnace provided with an air spray nozzle employed in the present invention;

8 is a detailed view of the air spray nozzle employed in the present invention;

9 is a flowchart of a sintering process according to the present invention.

<Description of reference numerals for the main parts of the drawings>

1: ora bin 2: drum mix

3: surge hopper 4: drum feeder

5: wind box 6: gas main duct

7: ignition furnace 8: sintering machine

9: main blower 10a, 10b: post-layer detection rod

11: deflector plate

12: burner 12a: flame

13 raw material ore (charging raw material) 13a: fusion ore

14 gas booster 14a pipe piping

14b: valve 15: air blower

15a: pipe piping 15b: valve

15c: pressure gauge 15d: valve

15e: hole 16: sintered ore moving direction

17: burner mounting portion 18: fusion light

19: air spray nozzle 20: support base

21: support base for nozzle fixing 21a: flange

21b: heat resistant gun 22: hole

22a: pipe 22b: flange

22c: cylinder

In the sintering operation of the present invention for achieving the above object, the method for preventing the formation of fused light inside the ignition furnace is to spray the air into the ignition furnace 7 with the support base 20 and the flange 21a on the upper side of the ignition furnace 7. A nozzle 19 is installed, and an air blower 15 is connected to the air spray nozzle 19 through a pipe line 15a, and a flow control valve 15b, 15d is connected to the pipe line 15a. And a pressure gauge (15c) to ignite the surface of the raw material by the burner 12, the air from the air blower (15) through the pipe piping (15a) and the air injection nozzle (19) After the ignition is completed and the ignition is completed, it is characterized in that the cold air flows into the pipe 15a and the air nozzle 19 to prevent the generation of fused light at the inner end of the ignition furnace.

Hereinafter, with reference to the accompanying drawings will be described in detail a method of preventing the internal fusion light generation in the sintering operation of the present invention.

3 is a diagram showing a direct type ignition furnace, in which a slit burner 12 is vertically installed on the sintering machine 8 to forcibly suck air in the air into the air blower 15 to open the pipe piping 15a. Through the burner 12 (0-15,000 Nm3 / H), and the fuel COG (coke oven gas) is a gas booster (14) with the appropriate pressure and the appropriate amount (0-1,300 Nm3 / H) Is supplied through the pipe piping 14a to bring the air-fuel ratio (air amount ÷ gas (COG) amount ÷ 4.1) to 1.0 to 3.0, making it close to complete combustion, and surface ignition of the upper blended raw material when sintering is performed in the sintering machine (8). I'm letting you.

4 is a plan view of the site where the raw material scattered to the end of the ignition furnace 7 in the upper part of the sintering machine 8 is formed and the fusion light 18 is formed. When the sintering is carried out in (8), the flame (12a) is ejected from the burner 12 of the upper sintering machine (8) inside the ignition furnace (7) when the surface of the raw material ore of the upper sintering machine (8) is complexed The fusion light 13a is formed at the end of the ignition furnace 7 as it is scattered and shows a process of continuously growing downward as a side view.

Fig. 6 is a front sectional view of the ignition furnace in which the air spray nozzles employed in the present invention are installed, and a pipe pipe 15a is separately installed in the ignition furnace 7 piping line of the air blower 15, which is a forced air suction device for combustion. After installing the main valve (15d) to each side of the ignition furnace (7).

In addition, each of the air spray nozzles 19 is provided with an injection air control valve 15b, and after the ignition furnace 7 is ignited, the valve 15b is opened so that cold air always flows into the air spray nozzle 19. The air spray nozzle 19 is cooled to prevent melting (melting loss) due to high temperature, and the hole 22 of the furnace wall of the ignition furnace 7 is processed larger than the diameter of the air spray nozzle 19 (55 mm). And, after welding the flange (21a) outside the wall of the ignition furnace 7 and sealed with a heat-resistant cloth (21b) to prevent the heat of the ignition furnace (7) leak out, a pressure gauge that can know the injection air pressure ( 15c) is installed in the pipe line 15a, and the upper part of the ignition furnace 7 is a support base for fixing the air spray nozzle 19 made of stainless steel after processing the hole 22 of 40 mm. Although the support base 20 is also smaller than the diameter of the ignition furnace 7 hole 22 in preparation for thermal expansion, a 35 mm pipe ( 22a) is manufactured by welding the flange (22b) in the upper portion, and the air spray nozzle (19) is installed by making a cylinder (22c) of 60mm to insert the air spray nozzle (19) in the lower portion.

Here, the supply flow rate of the main flow control valve (15d) is to be 800Nm3 / H, the air injection pressure is to be supplied to 250mmH ₂ O.

7 is a side cross-sectional view of an ignition furnace provided with an air spray nozzle employed in the present invention, in which raw materials are scattered by the flame 12a of the burner 12 when the sintering machine 8 proceeds in the sintered ore traveling direction 16. The ore is scattered at an angle of about 40 ° in the advancing direction of the sintering machine 8 and is continuously attached to the end of the ignition furnace 7 so that the ore is continuously grown at high speed by injecting air from both sides of the air injection nozzle 19 to the ignition furnace. (7) shows that the raw material ore is prevented from adhering.

Here, the air spray nozzle 19 is installed toward the ceiling of the ignition furnace 7 in a hole formed in two rows in the front, and the air injected by spraying air at an angle of 45 ° passes through the ceiling and the wall of the ignition furnace 7. By reaching the end of the ignition furnace 7 to prevent the formation of the fused light 18, the holes formed in one row are sprayed forward by 45 degrees from the bottom to the raw material ore of the upper part of the sintering machine 8 13) is prevented from being scattered in advance.

FIG. 8 is a detailed view of the air spray nozzle employed in the present invention, in which a pipe line 15a is installed in an air suction air blower 15 and a valve 15b for flow rate adjustment is installed in the pipe line 15a. In addition, the pressure gauge (15c) can be installed to know the pressure of the sprayed air.The air jet nozzle (19) has a length of 1,500mm and 200 holes (15e) with a diameter of 50mm in two rows, and the front two rows and the rear one row. The produced thing is shown in detail.

Here, the air jet nozzle 19 is made of a stainless pipe having a diameter of 50 mm that can withstand high temperatures (about 1,200 ° C.).

Next, the sintering process employing the method of preventing the internal fusion light generation in the ignition furnace of the present invention will be described with reference to FIG.

When the air blower 15 is started in step S1, the injection air control valve is opened in step S2, the gas booster 14 is started in step S3, and the air ignition air valve is opened in step S4 to flow air at 5,000 flow. After adjusting to Nm3 / H, open the gas safety shutoff valve in step S5, switch the gas control valve from automatic to manual in step S6, then open it and adjust the gas flow rate to 400 ~ 500Nm3 / H. 7) inject. When the ignition furnace 7 is ignited in this manner, the gas control valve is switched back to manual again and automatically. Then, the temperature of the ignition furnace 7 is input in step S7 by setting the temperature value of the ignition furnace 7 in step S7. When the temperature of the ignition furnace 7 becomes 600 degreeC or more or gas flow rate is 600 Nm <3> / H or more, the sintering machine 8 is started in the next step S9.

When the sintering machine 8 is activated, the ignition furnace 7 automatically adjusts the temperature of the ignition furnace 7 according to the temperature (1,000 to 1,200 ° C.) setting value. That is, when the sintering machine 8 is started in step S9, the sensor senses the temperature of step S8 and proceeds to step S4 and step S6 according to the setting temperature of step S7 so that the air-fuel ratio (air amount ÷ gas (COG) amount ÷ 4.1) is increased. It is adjusted to be 1.0 or more to adjust the temperature of step S8.

Subsequently, when the sintering machine 8 stops its operation in step S10, a stop signal is given in step S6 to adjust the gas control valve to adjust the gas flow rate to 200Nm3 / H, and proceed to step S11 to stop the gas safety shutoff valve. To close, the digestion in step S12 is to end the sintering operation.

As described above, in the sintering operation of the present invention, according to the method for preventing fusion furnace internal fusion light generation, air is forced to be fused at the end of the ignition furnace while the raw material spectra charged into the sintering machine are scattered by the burner flame due to the ignition during the sintering operation. It is possible to prevent the scratching of the inner surface by ignition by fusion light, and eliminate the need to stop the operation of the sintering machine to remove the fusion light, thereby improving productivity as well as the life of the ignition furnace. In addition to reducing the work load of the worker and has the advantage of preventing safety accidents.

Claims (1)

An air spray nozzle 19 is installed inside the ignition furnace 7 with the support base 20 and the flange 21a on the upper side of the ignition furnace 7, and a pipe pipe 15a is provided to the air spray nozzle 19. When the air blower 15 is connected to each other, the flow control valves 15b, 15d and the pressure gauge 15c are installed in the pipe line 15a, and when the raw material surface is ignited by the burner 12, From the air blower 15, the air is injected into the ignition furnace 7 through the pipe line 15a and the air spray nozzle 19, and after the ignition is completed, the inside of the pipe 15a and the air nozzle 19 A method of preventing fusion furnace internal fusion light generation in a sintering operation, characterized by preventing the generation of fused light at the inner end of the ignition furnace by flowing cold air.