KR101796081B1 - Method for manufacturing sintered ore and apparatus for sintering - Google Patents

Method for manufacturing sintered ore and apparatus for sintering Download PDF

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KR101796081B1
KR101796081B1 KR1020150149450A KR20150149450A KR101796081B1 KR 101796081 B1 KR101796081 B1 KR 101796081B1 KR 1020150149450 A KR1020150149450 A KR 1020150149450A KR 20150149450 A KR20150149450 A KR 20150149450A KR 101796081 B1 KR101796081 B1 KR 101796081B1
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South Korea
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sintering
sintering process
natural gas
bogie
raw material
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KR1020150149450A
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Korean (ko)
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KR20170048844A (en
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이승진
박종인
조병국
정은호
정해권
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주식회사 포스코
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/10—Reduction of greenhouse gas [GHG] emissions
    • Y02P10/143—Reduction of greenhouse gas [GHG] emissions of methane [CH4]

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  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)

Abstract

The method for producing sintered ores according to the present invention comprises the steps of charging a raw material for sintering for producing sintered ores in a truck, moving the truck in which the sintered raw material is charged to the direction of ignition, igniting the flame on the surface layer, And a sintering reaction is carried out while moving the bogie on the upper side of the plurality of windboxes arranged from the one side to the end point of the sintering process by the ignition to manufacture the sintered ores. When the sludge from the ignition furnace to the end point of the sintering process is referred to as sintering process section, synthetic natural gas (SNG) is supplied to the sludge during the movement of the sludge during the early stage of the sintering process ≪ / RTI >
Therefore, according to the embodiment of the present invention, temperature fluctuations of the upper and lower portions of the raw material layer can be reduced by supplying the heat source gas as a carrier in the early stage of the sintering process and supplementing the heat source. Thus, the sintered ores having uniform temperature distribution in the height direction of the raw material layer and having uniform strength and reductivity can be produced.

Description

FIELD OF THE INVENTION [0001] The present invention relates to a method for producing sintered ores,

More particularly, the present invention relates to a sintering apparatus capable of improving the quality and productivity of sintered ores and reducing pollutant emissions, and a method of manufacturing sintered ores.

The sinter ore used as a raw material in the blast furnace is produced by mixing iron ore and a binder which is a partial coke (or anthracite), then burning the coke and sintering the iron ore with the heat of combustion.

A general sintering plant for producing sintered ores is composed of a top light hopper in which upper light is stored, a surge hopper in which a mixed raw material is mixed after an iron ore raw material and a heat source coke are mixed, A plurality of bogies to be delivered in the process advancing direction, a conveyor for transferring a plurality of bogies in the process advancing direction, and a plurality of bogies disposed in the upper side of the bogie conveyed by the conveyor in the process advancing direction, A plurality of windboxes arranged in a line along which a plurality of bogies are arranged in one direction and are transported in a process advancing direction in a sparking ignition, the ducts being connected to the ends of the plurality of windboxes, And a blower (not shown) connected to the duct to generate a suction force.

On the other hand, the productivity (t / d / m 2 ) of the sintered ores in the sintering machine expresses the sintered ores generated in one day according to the unit area. At this time, the productivity of the sintering machine is determined by the width or length of the sintering machine, the height (or thickness) of the raw material layer to be charged into the conveyer, the charging density of the raw material layer, and the sintering time. In order to increase the production of sintered ore, the height of the raw material layer to be charged to the single rail is important, and the height of 800mm or less has been increased to 800mm or more. However, the increase in the height of the raw material layer lowers the air permeability of the raw material layer and causes a temperature deviation in the height direction of the raw material layer, which is a cause of deterioration in quality.

Further, generally, in the initial stage of sintering, since the width of the combustion layer in the raw material layer is narrow and the outside air at room temperature is directly introduced, the cooling progresses simultaneously with the sintering reaction. Thus, the amount of heat required for forming the sintered ores is insufficient at the initial stage of sintering. As the sintering process time elapses, the sucked outer product is heated and passes through the sintered high temperature layer to increase the temperature. This heat transfers sensible heat to the lower portion of the raw material layer, thereby causing an excessive heat phenomenon in the lower portion of the raw material layer .

The temperature deviation of the upper and lower portions of the raw material layer tends to become worse as the height of the raw material layer increases.

In order to reduce the temperature deviation of the upper and lower portions of the raw material layer as described above, oxygen, gaseous fuel, and liquid fuel are supplied to the upper portion of the raw material layer in the sintering process and the amount of the binder material is decreased in the lower portion, A method for forming a combustion zone has been proposed. However, in the case of liquid fuel, there is a risk of explosion, and in the case of the binder, it is difficult to charge the upper part and the lower part with a deviation, and a problem of insufficient calorie is caused not only in the lower part but also in the middle part.

In another method, a method of preparing blast furnace gas coke oven gas, blast furnace / coke mixture gas, city gas, natural gas, methane gas, ethane gas, propane gas, However, the above-mentioned gases have C, S, and N components, and when they are combined with oxygen, there is a problem of generating CO 2, SO x , and NO x , which are environmental regulation substances.

Therefore, research is needed to reduce temperature variations in the upper and lower portions of the raw material layer without generating environmental regulation components.

Korean Patent Publication No. 2002-0014877

The present invention provides a sintered light production method and sintering apparatus capable of improving the quality and productivity of sintered ores and reducing emission of pollutants.

The present invention provides a sintered light producing method and a sintering apparatus capable of reducing a height direction temperature deviation of a raw material layer.

A method for producing sintered ores according to the present invention comprises the steps of charging raw materials for sintering for producing sintered ores; A step of igniting the flame on the surface layer by moving the bogie loaded with the sintering compound material in the direction of ignition; And a step in which the sintering reaction is carried out while moving the bogies with ignited flames on the upper side of the plurality of windboxes arranged from the one side to the end point of the sintering process by the ignition to manufacture the sintered ores, Wherein the sintering process is carried out in the sintering process from the ignition furnace to the end point of the sintering process, ; Synthetic Natural Gas).

During the sintering process, the synthetic gas is supplied to the bogie during the movement of the bogie from the one side to the one-third point of the ignition.

The synthetic gas is supplied to the bogie while the bogie moves from 1/6 to 1/3 of the sintering process.

In supplying the synthetic natural gas, it is supplied together with the outside air, and the ratio of the outside air to the synthetic natural gas is adjusted to 8: 1 to 15: 1.

The sintering blending raw material includes iron ore and a binder, and a heat amount required to produce the sintering blend is supplied from the binder and the synthetic natural gas.

The feed rate per hour of the synthetic natural gas is adjusted to provide a caloric value per hour equal to or less than 5 kg / ts of the binder.

The sintering apparatus according to the present invention is characterized in that each of the sintering material is charged with a plurality of movable bogies; An ignition means for spraying a flame on an upper portion of the sintering raw material charged into the truck; A plurality of windboxes positioned below the plurality of bogies and arranged in one direction to provide a suction force to each of the plurality of bogies on a path along which the plurality of bogies move; A light distribution unit located at one end of the moving path of the bogie and discharging sintered light from the bogie; (SNG) is added to the bogie which is installed in an early stage of the sintering process section and moves downward when the sintering process section is referred to as the sintering process section from one side of the ignition path. Synthetic Natural Gas).

The hood is extended from the one side of the ignition to 1/3 of the sintering process.

The hood is extended from 1/6 to 1/3 of the sintering process.

And a SNG storage unit connected to the hood to supply the synthetic natural gas to the hood. The hood sucks the ambient air and the synthetic natural gas and supplies the natural gas to the vehicle.

Wherein the amount of heat required for producing the sintered ores is supplied from the binder and the synthetic natural gas, and the supply amount of the synthetic natural gas per hour is not more than 5 kg / t · s of the binder Lt; / RTI > to provide a calorie per hour.

According to the embodiment of the present invention, temperature fluctuations in the upper and lower portions of the raw material layer can be reduced by supplying the heat source gas in the early stage of the sintering process and replenishing the heat source. Thus, the sintered ores having uniform temperature distribution in the height direction of the raw material layer and having uniform strength and reductivity can be produced.

In addition, in the present invention, the use of the binder for generating environmental pollutants is reduced compared to the prior art, and SNG gas, which does not cause environmental pollution, is supplied to the heat source gas to supplement the heat source. Accordingly, it is possible to reduce the temperature variation of the raw material layer and the lower layer while reducing the generation of environmental pollutants in the sintering process.

1 is a view schematically showing a sintering apparatus according to an embodiment of the present invention;
2 is a schematic view showing a sintering reaction layer in a general sintering machine
Fig. 3 is a view showing the temperature with reference to a plurality of windboxes in order to explain the insufficient amount of heat in the sintering process section
4 is a view for explaining the sintering reaction layer, FFL and FBL in the sintering process, and illustrating the SNG gas supply position by the method according to the embodiment of the present invention
5 is a view for explaining the position of feeding the hood and the SNG gas in the sintering apparatus according to the embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail. It should be understood, however, that the invention is not limited to the disclosed embodiments, but is capable of other various forms of implementation, and that these embodiments are provided so that this disclosure will be thorough and complete, It is provided to let you know completely.

1 is a view schematically showing a sintering apparatus according to an embodiment of the present invention. 2 is a schematic view showing a sintering reaction layer in a general sintering machine. Fig. 3 is a graph showing the temperatures based on a plurality of windboxes in order to explain the lack of heat in the sintering process section. Fig. 4 is a view for explaining the sintering reaction layer, FFL and FBL in the sintering process, and explaining the SNG gas supply position by the method according to the embodiment of the present invention. 5 is a view for explaining a supply position of the hood and the SNG gas in the sintering apparatus according to the embodiment of the present invention.

Referring to FIG. 1, a sintering apparatus according to an embodiment of the present invention includes a drum feeder 100 and a drum feeder 100 storing a sintering blend material mixed with iron ores and a binder, A plurality of bogies 300 sequentially transported in the traveling direction, a conveyor 600 formed to extend in the process progress direction and to transport a plurality of bogies 300 in the process advancing direction, a conveyor 600 installed above the conveyor 600, A hood 400 installed at one side or a rear end of the ignition furnace 200 on the upper side of the conveyor 600 for supplying a gas for supplying a heat source as a bogie, A heat source storage part 800 in which gas is stored and connected to the hood and a plurality of winds that are arranged in a path along which a plurality of bogies are transferred from the lower side of the conveyor 600 to suck or suck the inside of the bogies 300, Box 500 as shown in FIG.

The sintering apparatus according to an embodiment of the present invention includes a duct 710 connected to a plurality of windboxes 500 through which gas discharged from the plurality of windboxes 500 is moved, a duct 710 connected to an end of the duct 710, A dust collector 720 installed on the front end of the duct 710 and the blower 730 on the extension path of the duct 710 to remove the dust of the transferred gas, And a light distribution portion disposed at one end and discharging the sintered light from the carriage 300.

The raw material for producing sintered ores, that is, the sintered raw materials to be charged into the carriage 300 includes iron ores and binders, and the binders include split coke and anthracite. That is, the raw material for sintering includes iron ore, a binder coke, and anthracite, and may further include limestone as an additive. The sintering compound material is mixed with water and is assembled with a particle diameter of 2 to 3 mm and charged into the drum feeder 100.

The wind box 500 provides a suction force to each of the plurality of bogies 300 so that the outside air sucked by the bogie 300, the gas in the bogie, the flame ignited by the ignition furnace 200, do. These windboxes (500) are provided in a plurality of ways so as to be arranged in one direction on the movement path of a plurality of bogies. More specifically, a plurality of wind boxes 500 are arranged from at least the drum feeder 100 to the front end of the light-directing portion.

The ignition furnace 200 is located at one side of the drum feeder 100 and injects the flame into the bogie 300 moved to the lower side after the sintering material is charged by the drum feeder 100. In the embodiment, the ignition furnace 200 is not limited to the gas burner, but various means capable of injecting the flame can be applied.

When the flame is sprayed onto the sintered blend material (hereinafter referred to as the raw material layer) charged into the carriage 300 from the ignition furnace 200, the heat due to the flame, the outside air sucked into the carriage 300, That is, the surface layer. The temperature around the flame is raised to 1300 DEG C to 1400 DEG C, and the sintering reaction of the iron ore proceeds as the subsidiary raw material limestone and iron ores form a low melting point compound and are partially melted. In addition, the one truck 300 is sequentially conveyed on the upper side of the plurality of windboxes 500 while being conveyed by the conveyor 600 in one direction. Thus, the sintering reaction progresses as the flame and heat of the surface layer of the raw material layer gradually move downward as the carriage 300 moves.

As described above, when the flame is injected from the ignition furnace 200, the periphery thereof is raised to 1300 ° C to 1400 ° C, and not only the position of the flame, but also the combustion in the flame periphery region and the sintering reaction due to the combustion are progressed. That is, the peripheral region including the flame in the height direction of the bogie becomes the sintering reaction layer, and the sintering reaction layer gradually moves downward as the bogie 300 moves toward the light diffusion portion.

That is, as shown in FIG. 2, the region in which the sintering is performed from the ignition furnace 200 toward the light-exiting portion, that is, the sintering reaction layer moves downward, and the region is widened. Flame front line (FFL) in FIG. 2 is a line connecting the lowermost point of the sintering region in the process direction at a point in the moving direction of the bogie 300 (or in the winding direction of the wind box) Line is the line connecting the top point. Then, sintering reaction occurs in which the region partitioned between FFL and FBL is the sintering reaction layer, and the iron ores are melted and coagulated in accordance with the combustion of the coke.

On the other hand, at the initial stage of sintering which passes through the ignition furnace 200, since the height (or thickness) of the sintering reaction layer in the raw material layer is narrow and outside air at room temperature is directly introduced, cooling progresses simultaneously with the sintering reaction. Therefore, the amount of heat required for forming the sintered ores is insufficient at the initial stage of sintering. Thereafter, when the bogie passes through the early sintering section, the drawn air is heated and passes through the sintered high temperature layer, whereby the temperature is increased, and the heat is transferred to the raw material layer. However, in the latter half of the sintering, there is a large amount of accumulated heat, which causes an excessive amount of heat in the lower part of the raw material layer.

To explain more specifically, the sintering process section from the ignition furnace 200 to the front end of the light-emitting section is the entire sintering process section, and the point immediately below the ignition furnace 200 is defined as a sintering start point and the front end of the light- Here, the section where the amount of heat of the raw material layer is generated is a section from 1/6 point (P1) to 1/3 point (P2) in the sintering process section. That is, when the bogie 300 is located at the lower side of the ignition furnace 200 and after the flame is injected and moves to the position before the 1/6 point P1, the calorific value of the flame injected from the ignition furnace 200 is maintained, While the bogie moves from the 1/6 point (P2) to the 1/3 point (P2), there is a problem of a low temperature due to a lack of heat in the upper part of the raw material layer.

This temperature deviation can be explained with reference to a plurality of windboxes 500. To do this, thirty windboxes 500 are provided from immediately below the ignition furnace 200 to the front end of the light emitter (hereinafter referred to as sintering finish point) And the wind box 500 immediately below the ignition furnace 200 is the first wind box 500 and the wind box 500 corresponding to the sintering end point is defined as the 30 th wind box 500. [ In this case, of the total 30 wind boxes 500, when the bogie 300 passes over the upper side of the wind box 500 located between the 1/6 point P1 and the 1/3 point P2 of the sintering process section , A heat shortage phenomenon occurs in the upper portion of the raw material layer. In other words, among the thirty windboxes 500 arranged from the ignition furnace 200 to the end point of the sintering process, the fifth wind turbine 500 located between the 1/6 point P1 and the 1/3 point P2, An insufficient amount of heat is generated between the sections of the box 500 to the tenth wind box 500. [ Therefore, while the bogie 300 maintains the heat of the flames injected from the ignition furnace 200 until the bogie 300 passes from the first windbox 500 to the upper side of the fourth windbox 500, the fifth windbox 500 ) To the upper side of the tenth wind box 500, an insufficient amount of heat is generated in the upper part of the raw material layer.

The temperature difference between the top and bottom of the raw material layer can also be found from the slope difference between FFL and FBL shown in Figs. In order to improve the quality of the sintered ore and the productivity of the sintered ores, it is preferable that the sintering reaction layer in the section between FFL and FBL has a uniform width. To do this, the slope of the FBL must be made parallel or as close as possible to the slope of the FFL, which can be overcome by solving the lack of heat in the upper layer of the feedstock.

A graph showing FFL and FBL according to the movement direction of the carriage 300 or the sintering process progression direction is shown in FIG. A line having an inclination parallel to the FFL is referred to as IFBL (Ideal Frame Back Line), and IFBL is formed extending from the 1/6 point P1 of the sintering process section as shown in FIG. In the present invention, the phenomenon of insufficient heat of the upper portion of the raw material layer is reduced by moving the FBL to the IFBL as much as possible.

When FBL and IFBL are shown on one graph as shown in FIG. 4, a contact point where FBL and IFBL meet occurs, and the position of the contact in the X axis direction is one third (P2) of the sintering process section. On the basis of the 1/3 point (P2) of the sintering process section, there is a phenomenon that the amount of heat in the upper part of the raw material layer is insufficient in the section before the 1/3 point (P2) A phenomenon that the amount of heat in the lower part of the layer becomes excessive occurs. More specifically, from the 1/6 point (P1) to the 1/3 point (P2) of the sintering process section, the amount of heat in the upper part of the raw material layer is insufficient, and after the 1/3 point (P2) In the latter part of the process, the excessive amount of heat is generated in the lower part of the raw material layer.

In the present invention, a hood 400 is provided at the rear end of the ignition furnace 200 in order to reduce the temperature deviation between the top and bottom of the raw material layer, and the gas for the heat source is supplied. That is, in the present invention, when the bogie passes through at least the heat deficiency section, the heat source gas is supplied to reduce the temperature deviation.

At this time, the gas for the heat source may be supplied from one side of the ignition furnace 200 to the 1/3 point, or may be supplied from the 1/6 point to 1/3 point corresponding to the insufficient calorific section.

For example, suppose that thirty windboxes are arranged from just below the ignition furnace 200 to the sintering end point, the first windbox is located immediately below the ignition furnace 200, and the thirtieth windbox 500 correspond to each other. In this case, as the first embodiment, the bogie 300 supplies the heat source gas while moving from the wind box 500 located at the immediate side of the ignition furnace 200 to the tenth wind box 500. The present invention is not limited to this. As a second embodiment, it is possible to supply the gas for the heat source when the bogie 300 passes through the zone from the fifth wind box 500 to the tenth wind box 500 have.

In the present invention, as shown in FIG. 1, a hood 400 is installed on one side of the ignition furnace 200 and a heat source storage unit 800 is connected to the hood 400 for supplying the heat source gas.

When the gas for the heat source is supplied from the first side to the third side (P2) of the ignition furnace 200 during the sintering process section, the hood 400 is ignited as in the first embodiment shown in FIG. 5 (P2) from one side of the first housing (200). In other words, of the thirty windboxes 500, the hood 400 is installed so as to correspond to the upper region of the tenth windbox 500 from one windbox 500 on one side of the ignition furnace 200.

As another example, when the gas for the heat source is supplied from the 1/6 point (P1) to the 1/3 point (P2) of the sintering process section, the hood 400, as in the second embodiment shown in FIG. 6, And extends from 1/6 point (P1) to 1/3 point (P2) in the process section. That is, the hood 400 is installed to correspond to the upper area of the tenth wind box 500 from the fifth wind box 500 out of the thirty wind boxes 500.

In the present invention, by supplying the gas for the heat source in the early stage of sintering, the problem of insufficient heat of the upper portion of the raw material layer is solved, and the temperature deviation between the upper and lower layers of the raw material layer is reduced or the temperature is made uniform. Therefore, it is possible to reduce the difference in the reducing property and the strength in accordance with the temperature variation in the height direction of the raw material layer.

As described above, in the embodiment of the present invention, synthetic natural gas (hereinafter referred to as SNG (Synthetic Natural Gas)) is used as the heat source gas for supplying the heat source gas at the beginning of the sintering.

SNG is a gas obtained by refining and gasifying solid coal, which is mainly composed of methane (CH 4 ), called synthetic natural gas or alternative natural gas. On the other hand, LNG is liquefied by cooling methane obtained by refining natural gas, and its production method, composition and composition are different from SNG.

Table 1 shows the general composition of SNG. Referring to Table 1, the SNG includes elements CH 4 , CO 2 , CO, H 2 and H 2 O that generate heat by reaction with oxygen, and CH 4 is the most abundant, .

Table 2 shows the composition of anthracite coal, which is generally used as a raw material for binders in sintered blend materials, by product.

CH 4 H 2 CO 2 N 2 Ar CO H 2 O content
97.26
weight% 0.1
weight% One
weight% 1.39
weight% 0.22
weight% 0.01
weight% 34 ppm

Total Sulfur
Content (% by weight) C content
(weight%) H content
(weight%) N content
(weight%) O content
(weight%) 1st anthracite 0.19 98.12 0.95 0.4 0.34 2nd anthracite 0.49 92.28 3.04 1.52 2.67 Third Anthracite 0.32 95.51 1087 1.29 1.01 4th anthracite 0.36 97.41 1.21 0.45 0.57 5th anthracite 0.8 95.95 1.92 0.82 0.51

As shown in Table 1 and Table 2, SNG does not include sulfur (S), which is a problem in environmental pollution, and N content is extremely low (Table 1). However, in case of anthracite coal, it is the main cause of environmental pollution. Regulated material contains sulfur (S), and nitrogen (N) is also contained in a larger amount than SNG. That is, the coal the sulfur (S) and nitrogen (N) when there is a reaction with oxygen, SO X, NO X occurs, which is a substance for SO X, NO X is caused environmental pollution. However, the SO X, it sulfur (S) and nitrogen (N) for generating a large amount of NO X is contained in the coal, the use of the hard coal is causing environmental pollution.

Accordingly, in the present invention, the ratio of the binder used as a binder for the purpose of providing a heat source for combustion is reduced, and SNG gas is supplemented, thereby minimizing or preventing generation of environmental pollutants and solving the problem of insufficient heat source.

Table 3 shows the calorific value of general binder composed of coke and anthracite, and Table 4 shows calorific value according to binder and SNG usage.

division Binding discretion
(kg / t · s) Combined Heat
(kcal / kg) per hour
Usage (t / hr) Calories per hour
(Gcal / hr) cokes 22.2 7100 15.54 110.334 hard coal 33.3 6448 23.31 150.302 Binders
(Coke + anthracite) 55.5 670808 38.85 260.636

division Calories per hour (Gcal / hr) Binder 1 kg / t · s 4.69 Gcal / hr SNG 100 Nm 3 / hr 1 Gcal / hr

Generally, the binder has a calorific value of 6000 to 7000 kcal / kg (see Table 3), and the SNG gas has a caloric value of 9000 to 10000 kcal / Nm 3 , although the binder depends on the completion and proportion of coke and anthracite coal to be.

Referring to Table 4, when the amount of binder used is 1 kg / t · s, the amount of heat per hour is 4.69 Gcal / hr. When the amount of SNG gas used is 100 Nm 3 / hr, the amount of heat per hour is 1 Gcal / hr. In the present invention, SNG gas is supplied in order to compensate for the decrease in heat quantity due to the decrease in the amount of binder used. That is, when the amount of binder used is decreased by 1 kg / t · s, the amount of heat of 4.69 Gcal / hr per hour decreases. Therefore, it is true that the SNG is supplied at 469 Nm 3 / hr from the viewpoint of heat quantity conservation. 30% to 100% of 469 Nm 3 / hr is supplied. In other words, the quantity of heat loss is determined according to the amount of use of the binder, and the quantity of heat loss is the maximum (100%) quantity to be supplemented by the supply of SNG. In the present invention, the SNG gas is supplied to compensate for the amount of heat of 30% to 100% of the amount of decrease in the amount of heat.

For example, when the binder is reduced to 1 kg / t · s, the calorie reduction amount is 4.69 Gcal / hr. In order to compensate for this, in the present invention, 30 to 100% of the calorie of 4.69 Gcal / hr is supplemented. That is, when the binder is reduced by 1 kg / ts, the amount of heat decrease is 4.69 Gcal / hr, so SNG gas is supplied at 140 Nm 3 / hr to 469 Nm 3 / hr.

In this way, the adjustment of between 30% and 100% without compensating for 100% of the unconditional reduction in the amount of heat is intended to prevent overheating of the lower layer.

Further, in the present invention, when the amount of binder used is reduced compared to the conventional method, and the amount of decrease of the binder is 5 kg / ts or less, more preferably 5 kg / ts or less .

Even if the SNG gas is supplied, if oxygen is insufficient, incomplete combustion may occur. Therefore, sufficient outside air must be sucked together with the SNG gas, and the ratio of the outside air to the SNG is set to 8: 1 to 15: 1. When the ratio of the outside air to the SNG is less than 8: 1, there is a problem that the oxygen is not sufficient and the combustion can not be complete, resulting in incomplete combustion.

As described above, limiting the amount of decrease of the binder to 5 kg / t · s or less and limiting the outside-air-to-SNG ratio to 15: 1 or less is due to the limit of the air volume that can be sucked in the windbox 500.

This is because, when the amount of decrease of the binder is decreased to exceed 5 kg / ts, the SNG gas must be supplied by the amount of the reduced binder, and the amount of outdoor air supplied to the hood 400 by the increased SNG gas supply amount is increased . When the reduction amount of the binder exceeds 5 kg / t · s, the amount of the SNG gas and the external quantities necessary for supplementing the heat amount is increased by the wind box 500, (500) sucks.

Accordingly, in the present invention, 23.45 Gcal / hr of heat of 5 kg / ts of the binder is supplied at the maximum (100%) and at least 30% in supplementing the heat source by supplying the gas SNG for the heat source. That is, the supply amount (100%) of the SNG is 703.5 Nm 3 / hr (30%) to 2,345 Nm 3 / hr (100%), and the outer space to SNG ratio is 8: 1 to 15: 1.

More preferably, the supply amount (100%) of SNG is 562.8 Nm 3 / hr (30%) to 1,876 Nm 3 / hr (100%) when the binder is the maximum (100%) 4 kg / At this time, the ratio of the outside air to the SNG is 8: 1 to 15: 1.

Hereinafter, a sintering apparatus according to an embodiment of the present invention and a method for manufacturing sintered ores and reduced iron using the same will be described with reference to FIGS. 1 to 6. FIG.

First, prepare an assembly for producing sintered ores. That is, the iron ore raw material, the binder, the minor raw material limestone (CaCO 3 ), and water are mixed in a mixer, and they are assembled and pre-assembled into particles having an average particle size of 2 to 3 mm. Here, the binder includes a mixture of coke and anthracite, and the binder is mixed or blended in a reduced amount of less than 5 kg / t · s. The assembly is then stored in the drum feeder.

Thereafter, a plurality of bogies 300 sequentially pass under the drum feeder 100, and the drum feeder 100 sequentially loads the stored assemblies into a plurality of bogies 300. The bogie 300 loaded with the assembly by the drum feeder 100 passes under the ignition furnace 200 located at one side of the drum feeder 100 and the ignition furnace 200 is connected to the upper side of the bogie 300 And is ignited on the upper layer of the assembly in the carriage 300, that is, the surface layer of the raw material layer.

The carriage 300, in which the flame is ignited, moves in the direction of the light-distribution portion in accordance with the operation of the conveyor 600. At this time, the outside air is sucked into the hood 400 by the suction force of the plurality of wind boxes 500 and supplied into the car 100. The oxygen and the coke in the binder are burned in the sucked air, Sintering reaction occurs.

The sintering reaction proceeds from the surface layer of the raw material layer to the downward direction as the single rail 300 moves in the direction in which the light distribution portion is located from the ignition furnace 200.

The bogies from which the flame is ignited move from the ignition furnace 200 toward the light shade portion and the SNG gas is supplied from the hood 400 while the bogie 300 moves to the 1/3 point P2 of the sintering process section. That is, when the bogie 300 is moved from one side of the ignition furnace 200 to the third side (P2) of the ignition furnace 200, To supply SNG gas. To describe a plurality of windboxes 500, for example, when 30 windboxes are arranged from immediately below the ignition furnace 200 to the sintering end point, The SNG gas is supplied from the upper side.

The SNG supply section is not limited to the above-described example, and SNG gas may be supplied from the 1/6 point (P1) to the 1/3 point (P2) of the sintering process section. That is, when the bogie 300 moves from the 1/6 point P1 to the 1/3 point P2 of the sintering process section, that is, from the immediate side of the ignition furnace 200 to the light emitter, And supplies the SNG gas to the bogie 300. In other words, the SNG gas is supplied in the region corresponding to the insufficient calorific section, that is, the fifth wind box 500 to the tenth wind box 500 section.

Here, the supply amount of the SNG gas is determined and supplied according to the decrease amount of the binder as described above. And together with the SNG gas, the outside air is supplied together so that the ambient air to SNG gas is between 8: 1 and 15: 1.

SNG gas and air is fed to the truck 300 through the hood, and the like SNG gas of carbon (C) and means that components having a hydrogen (H) CH 4 generates heat by reaction with oxygen, the heat of this raw material It serves to supplement the heat in the layer. Therefore, even when the amount of the binder is reduced compared with the conventional method, the amount of heat generated in the upper portion of the raw material layer can be sufficiently secured, and the amount of the component that causes environmental pollution can be reduced.

100: Dream feeder 200: By ignition
300: Bogie 400: Hood
600: Wind Box

Claims (11)

Charging the raw material for sintering to produce a sintered ore;
A step of igniting the flame on the surface layer by moving the bogie loaded with the sintering compound material in the direction of ignition;
A step in which the sintering reaction is performed while moving the bogies with ignited flames on the upper side of the plurality of wind boxes arranged from one side to the end point of the sintering process by the ignition to produce sintered ores;
/ RTI >
In moving the bogie from one side to the end of the sintering process by the ignition,
A step of supplying synthetic natural gas (SNG) to the bogie during the movement of the bogie during the initial section of the sintering process section from the ignition furnace to the end point of the sintering process;
/ RTI >
In supplying the synthetic natural gas,
Supplying the synthetic natural gas to the truck while the truck moves from the one side of the ignition to the one-third point during the sintering process,
Wherein the sintering raw material comprises iron ores and a binder,
The amount of heat required to produce the sintered ores is supplied from the binder and the synthetic natural gas,
The feed rate of the synthetic natural gas per hour is controlled to provide more than 30% and less than 100% of the amount of heat per hour corresponding to 5 kg / ts or less of the binder,
Wherein the ratio of the outside air to the synthetic natural gas is adjusted to 8: 1 to 15: 1 in supplying the synthetic natural gas together with the outside air. delete The method according to claim 1,
Wherein the synthetic gas is supplied to the bogie while the bogie moves from 1/6 to 1/3 of the sintering process. delete delete delete A plurality of movable bogies;
An ignition means for spraying a flame on an upper portion of the sintering raw material charged into the truck;
A plurality of windboxes positioned below the plurality of bogies and arranged in one direction to provide a suction force to each of the plurality of bogies on a path along which the plurality of bogies move;
A light distribution unit located at one end of the moving path of the bogie and discharging sintered light from the bogie;
(SNG) is added to the bogie which is installed in an early stage of the sintering process section and moves downward when the sintering process section is referred to as the sintering process section from one side of the ignition path. Synthetic Natural Gas);
Lt; / RTI >
The hood is extended from the one side of the ignition to 1/3 of the sintering process, Supplying the synthetic natural gas together with ambient air,
Wherein the sintering raw material comprises iron ores and a binder,
The amount of heat required to produce the sintered ores is supplied from the binder and the synthetic natural gas,
The amount of the synthetic natural gas supplied per hour is not less than 30% and less than 100% of the amount of heat per hour corresponding to 5 kg / t · s or less of the binder Lt; / RTI >
Wherein the ratio of the outside air to the synthetic natural gas is adjusted to 8: 1 to 15: 1. delete The method of claim 7,
Wherein the hood extends from 1/6 to 1/3 of the sintering process. The method according to claim 7 or 9,
And a SNG storage unit connected to the hood and supplying synthetic natural gas to the hood,
Wherein the hood sucks the outside air and the synthetic natural gas and supplies the air to the car. delete
KR1020150149450A 2015-10-27 2015-10-27 Method for manufacturing sintered ore and apparatus for sintering KR101796081B1 (en)

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