KR101705055B1 - Processing method for raw material - Google Patents

Abstract

The present invention relates to a method for manufacturing a feedstock, comprising the steps of: preparing a raw material; charging raw materials in a traveling path of the moving path in the order of an ignition section and a sintering section; And supplying the raw material to a cooler to cool the raw material. The process of supplying and circulating the gas includes mixing oxygen into the exhaust gas of the cooler and supplying the mixture to the sintering section As a raw material treatment method, a raw material treatment method capable of controlling the supply condition of a gas supplied to a raw material in the process of sintering the raw material to improve the quality of the raw material after the treatment is provided.

Description

Processing method for raw material

The present invention relates to a raw material processing method, and more particularly, to a raw material processing method capable of controlling a supply condition of a gas supplied to a raw material in the course of sintering the raw material to improve the quality of the processed raw material.

The sintering process is a process of sintering a sintering blend raw material produced from minute iron ore, additives and fuel as raw materials, and then sintering the sintered blend raw material. During the sintering process, the temperature of the upper layer of the sintering material should be controlled above the proper temperature while the sintering material is being sintered.

However, heat may be continuously lost in the upper layer of the sintered blended raw material exposed in the air while the sintered blend raw material is sintered in the sintered bogie, so that the upper layer of the sintered blended raw material may not be controlled at a desired temperature. In this case, the upper layer of the sintering blend raw material may be uneven or insufficiently sintered, which causes deterioration of the quality of the produced sintered ores. Therefore, improvement of the sintering process is required to control the temperature of the upper layer of the raw material for sintering to a desired temperature.

KR 10-2014-0016658 A

The present invention provides a raw material treatment method capable of controlling a supply condition of a gas supplied as a raw material.

The present invention provides a raw material treatment method capable of controlling the temperature of the upper layer of the raw material to a high temperature.

The present invention provides a raw material treatment method capable of evenly sintering a raw material from an upper layer to a lower layer of the raw material.

The present invention provides a raw material treatment method capable of improving the quality of a processed raw material.

A raw material treatment method according to an embodiment of the present invention includes a process of preparing a raw material; A step of subjecting the raw material to a pressure in a bogie traveling in one direction of the moving path and moving it in the order of charging zone, ignition zone and sintering zone of the moving path and performing heat treatment; Supplying and circulating gas in different sections of the movement path; And supplying and cooling the raw material to a cooler. The process of supplying and circulating the gas includes mixing oxygen into the exhaust gas of the cooler and supplying the mixture to the sintering section.

The sintering section may be divided into a first sintering section, a second sintering section, and a third sintering section in a direction in which the raw material moves, and may be supplied with gas under different feeding conditions. The first sintering zone may be one half of the entire length of the moving path from the beginning of the sintering zone to the charging zone, the ignition zone, and the sintering zone. The second sintering zone may range from a point half of the entire section of the movement path to a point where the temperature of the exhaust gas generated in the sintering zone is maximum.

The process of supplying and circulating the gas includes mixing oxygen into the exhaust gas of the cooler and supplying the mixed gas to the first sintering section; And supplying the exhaust gas of the second sintering section to the third sintering section.

The volume ratio of oxygen mixed in the exhaust gas of the cooler may be 40% or less.

According to the embodiment of the present invention, the supply condition of the gas supplied to the raw material can be controlled, and the temperature of the upper layer of the raw material can be controlled at a high temperature, so that the raw material can be uniformly sintered from the upper layer to the lower layer of the raw material. From this, the quality of the processed raw material can be improved.

For example, in the case of applying to a sintering process of a sintering material, a mixed gas of a cooler exhaust gas and oxygen is supplied to a first sintering region located immediately after an ignition furnace, and a mixed gas of a cooler exhaust gas and oxygen is supplied to the first sintering region, Size and temperature can be increased. Accordingly, the temperature of the upper layer of the raw material can be maintained at a high temperature for a long time in the second sintering section and the third sintering section subsequent to the first sintering section, so that the raw material can be evenly combusted from the upper layer to the lower layer. From this, the quality of the sintered ores can be improved.

In addition, the gas exhausting conditions of the second sintering zone can be separately controlled by exhausting the exhaust gas in the second sintering zone having the thickest thickness of the raw material, separately from the remaining zones, so that the raw material passing through the second sintering zone Can be reduced. Therefore, the combustion efficiency of the raw material passing through the second sintering section can be further increased, and the raw material can be evenly combusted from the upper layer to the lower layer of the raw material. From this, the quality of the sintered ores can be improved.

1 is a view for explaining a raw material processing apparatus according to an embodiment of the present invention.
2 is a view for explaining a raw material processing apparatus according to a modified example of the present invention.
3 is a view for explaining a raw material treatment method according to an embodiment of the present invention.
4 is a view for explaining a state of a raw material and an exhaust gas in a process of processing a raw material by using a raw material processing method according to an embodiment of the present invention.
5 is a conceptual diagram of an apparatus for performing a sintering experiment of a raw material according to an embodiment of the present invention and a comparative example.
6 is a diagram for explaining sintering experiment results of raw materials according to comparative examples of the present invention.
7 is a view for explaining sintering experiment results of raw materials according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but may be embodied in various forms. It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. BRIEF DESCRIPTION OF THE DRAWINGS The drawings may be exaggerated or enlarged to illustrate embodiments of the invention, wherein like reference numerals refer to like elements throughout.

FIG. 1 is a schematic view for explaining an embodiment of a plant to which a raw material disposal method according to an embodiment of the present invention is applied, FIG. 2 is a schematic view showing another embodiment of a plant to which a raw material disposal method according to an embodiment of the present invention is applied Fig.

Referring to FIG. 1, a raw material processing apparatus 100 to which a raw material processing method according to an embodiment of the present invention is applied includes an ignition furnace 110, a charging unit 120, a car 130, a windbox 140, 1 gas circulation unit 150, an oxygen supply unit 160, a crushing unit 171, a cooler 172, a second gas circulation unit 180, and an exhaust unit 190.

The raw material may be a raw material for sintering used as a raw material in the process of producing the sintered ore. For example, the raw material may be prepared by charging minute iron ores, additives and anthracite (or minute coke) into a drum mixer and mixing and moisturizing them.

The ignition furnace 110 is formed to inject a flame downward and can be disposed above the ignition section of a travel path to be described later. The ignition furnace 110 serves to ignite the raw material by supplying a flame to the upper layer of the raw material loaded in the bogie 130 which travels in one direction.

The charging section 120 is formed to supply the raw material to the lower side and may be disposed above the charging section of the moving path to be described later. The charging unit 120 may be, for example, a predetermined hopper having a space for storing a raw material therein, and a chute for charging the raw material smoothly may be provided in a lower opening thereof. The charging unit 120 drives the moving path in one direction and guides the material to the inside of the truck 130 passing through the charging section.

The bogie 130 may be provided with a space in which a material is loaded therein, and may include a plurality of bogies arranged continuously in one direction, and may be connected in an endless manner to form a movement path of the upper side and a return path of the lower side . The carriage 130 travels in one direction on the movement path, moves the loaded material in one direction, then travels in the opposite direction in one direction on the return path, and can be returned to the movement path on the upper side again.

The movement path may include a plurality of sections, and the plurality of sections may include a charging section, an ignition section, and a sintering section. The plurality of sections may be consecutively arranged in the order of a loading section, an ignition section, and a sintering section on the basis of a direction in which the raw material moves.

The charging section is a section for loading the raw material on the carriage 130 and may be located at one side edge relatively to the preceding side with respect to the direction of movement of the raw material among the opposite side edges in one direction of the moving path. The ignition period is a period for igniting the upper layer of the raw material loaded on the bogie 130, and may be positioned behind the charging zone relative to the moving direction of the raw material. The sintering zone is a zone for propagating the flame formed in the upper layer of the raw material loaded on the bogie 130 to the lower layer of the raw material and sintering the raw material and may be positioned behind the ignition zone relative to the moving direction of the raw material.

The sintering section may include a first sintering section, a second sintering section, and a third sintering section, wherein the first sintering section, the second sintering section, and the third sintering section, As shown in FIG.

The first sintering section may be a section from a point on the movement path where the sintering section starts to a half of the entire movement path including the charging section, the ignition section and the sintering section, and the second sintering section may be a section To the point BTP at which the temperature of the flue gas generated in the sintering section reaches the maximum. The third sintering zone may be a zone from the point where the exhaust gas temperature of the sintering zone reaches the maximum temperature (BTP) to the point where the sintering zone ends. Alternatively, although not shown in the figure, the second sintering section may be a section from a half of the entire movement path to a point at which combustion of coal contained in the raw material is terminated (BRP). In this case, the third sintering section may be a section from the point at which the combustion of coal contained in the raw material ends (BRP) to the point at which the sintering section ends. The first sintering zone to the third sintering zone may be supplied with gas under different supply conditions.

The bogie 130 travels in one direction in the movement path of the upper side, and can sequentially move the charging section, the ignition section, and the sintering section to move the loaded material in the order of the charging section, the ignition section, and the sintering section.

The wind box 140 is provided at a lower portion of the movement path, and a plurality of the wind boxes 140 may be continuously arranged in one direction, and may be connected to the inside of the bogie 130 running in one direction in the movement path. The wind box 140 forms a negative pressure in the inside of the wind box 140 and serves to draw in the inside of the car 130 while the car 130 travels in one direction along the movement path. The gas and the flame are moved and propagated in the direction from the upper layer to the lower layer of the raw material loaded on the raw material, and the raw material can be sintered.

The first gas circulation unit 150 is connected to the windboxes located at the second sintering zone of the plurality of windboxes 140 so as to supply the exhaust gas of the second sintering zone to the third sintering zone, And can be extended to the upper side of the sintering section to be opened.

The first gas circulation unit 150 may include a first chamber 151, a first blower 152, a first connection pipe 153, and a first hood 154. The first chamber 151 has a space through which gas can pass and can be connected to the wind boxes of the second sintering section. One end of the first connection pipe 153 may be mounted in the first chamber 151 and the other end may extend upward of the third sintering section. The first blower 152 may be mounted on one side of the first connection pipe 153 to form a gas flow inside the first connection pipe 153 from one end of the first connection pipe 153 to the other end. The first hood 154 may be disposed to cover the upper side of the third sintering section and may be connected to the other end of the first connection pipe 153.

The first gas circulation unit 150 is provided with a strong suction force in the direction from the upper layer to the lower layer of the raw material to the raw material loaded inside the bogie 130 passing through the second sintering section which is relatively high resistance to air permeability Thereby improving the air permeability of the raw material passing through the second sintering section. Meanwhile, in order to improve the air permeability of the second sintered region, the exhaust gas drawn in the second sintered region may be supplied to the third sintered region and utilized for compensating the heat loss in the third sintered region.

The oxygen supply unit 160 may include an oxygen supply pipe 161 connected to the second gas circulation unit 180 and a control valve 162 mounted on one side of the oxygen supply pipe 161. The oxygen supply unit 160 2 gas circulation unit 180 to supply oxygen to the inside of the second gas circulation unit 180. Oxygen can be supplied to the first sintering section by mixing oxygen with the exhaust gas of the cooler 172 inside the second gas circulation section 180 by the oxygen supply section 160.

Thus, the upper layer of the raw material is burned more smoothly in the first sintering section, and the high temperature region formed in the upper layer of the raw material can be increased in the direction from the upper layer to the lower layer of the raw material. Thus, the high-temperature region of the raw material can be maintained for a long time in the second sintering section and the third sintering section, and at the same time, moisture can be smoothly removed from the raw material and the efficiency in the sintering section can be improved.

The crushing section 171 may be disposed apart from the third sintering section. The sintered material, which has passed through the third sintering section and has been sintered, is discharged from the bogie 130 in the process of the bogie 130 entering the transfer path on the lower side. It can be crushed by particle size.

The cooler 172 has a space in which the sintered light can be received, and can be disposed apart from the crushing part 171. A coolant (cooler gas) for cooling the sintered ores can be supplied to the cooler 172 as a gas.

The second gas circulation unit 180 may be connected to the cooler 172 at one end and open at the other end to the upper side of the first sintering section to supply the exhaust gas of the cooler 172 to the first sintering section.

The second gas circulation unit 180 may include a second connection pipe 181, a second blower 182, and a second hood 183. The second connection pipe 181 may be mounted at one end to the cooler 172 and the other end may extend upward from the first sintering section to be opened. A second blower 182 may be mounted on one side of the second connection pipe 181 to form a gas flow inside the second connection pipe 181 from the other end of the second connection pipe 181 to the other end. The inside of the second hood 183 is opened downward and may be disposed to cover the upper side of the first sintering section and may be connected to the other end of the second connection pipe 181.

The second gas circulation unit 180 serves to compensate the heat loss of the raw material in the first sintering zone by using the waste heat of the cooler 172. In order to accomplish this more effectively, the second gas circulation unit 180 may further include a temperature sensor (not shown) and a control unit (not shown). That is, the temperature sensor is attached to the second connection pipe 181 to measure the exhaust gas temperature of the cooler 172 passing through the inside of the second connection pipe 181. If the temperature of the exhaust gas is equal to or higher than a predetermined temperature, The control unit controls the operation of the second blower 182 to supply the exhaust gas of the cooler 172 to the first sintering zone. In other words, corresponding to the exhaust gas temperature value of the cooler 172, the exhaust gas of the cooler 172 can be selectively supplied to the first sintering section.

An oxygen supply pipe 161 is connected to one side of the second connection pipe 181 located between the second hood 183 and the second blower 182 and is connected to a cooler Oxygen may be mixed in the exhaust gas of the cooler 172 and the exhaust gas of the cooler 172 may be supplied to the first sintering section in a state where oxygen is mixed.

As described above, the second gas circulation unit 180 can supply the mixed gas containing oxygen to the exhaust gas of the cooler 172 to the first sintering zone to more smoothly burn the upper layer of the raw material passing through the first sintering zone. Therefore, the thickness of the high temperature region formed in the upper layer of the raw material can be increased in the direction toward the lower layer of the raw material, and the high temperature region of the raw material can be maintained for a long time in the second sintering section and the third sintering section. From this, the thermal efficiency in the entire sintering section can be improved. Therefore, consumption of fuel consumed for sintering the raw material can be reduced compared to the conventional case.

On the other hand, dust originating from a sintered raw material such as sintered light is mixed in the exhaust gas of the cooler 172, which can be supplied to the first sintering section and reused as fuel. In addition, since the dust collector is not separately provided in the cooler 172, the structure of the apparatus can be simplified, and the dust collecting process can be omitted when the sintered raw material is cooled, The process of the raw material processing method described later can be simplified.

The exhaust unit 190 is installed in the windbox 140 to discharge the exhaust gas drawn into the windbox 140 to the outside air. The windbox 140 includes a plurality of windboxes 140, a plurality of windboxes 140, an ignition zone, And the other end may extend outwardly of the movement path and be opened.

The exhaust unit 190 may include a second chamber 191, a dust collector 192, a third blower 193, and an exhaust port 194. The second chamber 191 has a space through which gas can pass and can be connected to wind boxes of a charging section, an ignition section, a first sintering section and a third sintering section. The dust collector 192 can be connected to the end of the second chamber 191 and the third blower 193 can be connected to the dust collector 192 and the third blower 193 can be connected to the wind boxes A gas flow can be formed inside the second chamber 191 in a direction toward the end of the second chamber 191. [ The third blower 193 may be connected to an exhaust port 194.

A strong suction force such as a negative pressure is provided to the wind box 140 connected to the charging section 190, the ignition section, the first sintering section and the third sintering section to improve the air permeability of the raw material passing through each section. The raw material loaded on the bogie 120 passing through each section by the exhaust unit 190 can be moved and propagated in the direction from the upper layer to the lower layer.

In addition, the exhaust unit 190 passes the exhaust gas through the dust collector 192 in the process of exhausting the exhaust gas of the charging section, the ignition section, the first sintering section and the third sintering section to the outside air, and the contaminants such as dust are filtered from the exhaust gas And then exhausts it to the exhaust port 194, for example, a stack.

The raw material processing apparatus 100 formed as described above can compensate the heat lost from the upper layer of the raw material by circulating supply of the exhaust gas while the raw material loaded on the car 130 is sintered while passing through each section. Particularly, it is possible to improve the temperature and combustion efficiency of the upper layer in the first sintering zone by supplying a high-temperature exhaust gas and oxygen to the upper portion of the raw material while the raw material passes through the first sintering zone through the ignition zone, The quality of the finished raw material such as the sintered ores can be improved.

1, a raw material processing apparatus to which a raw material processing method according to an embodiment of the present invention is applied has been described. However, the raw material processing apparatus may be implemented in various forms including the following other embodiments. Referring to FIG. 2, the oxygen supply unit 160 of the raw material processing apparatus 100 according to another embodiment of the present invention may further include an injector 163.

The injector 163 may be disposed inside the second hood 183 of the second gas circulation unit 180 and may be connected to the oxygen supply pipe 161 of the oxygen supply unit 160. A plurality of nozzles may be provided in the injector 163, and oxygen may be injected downward through the nozzles. In this case, the oxygen supplier 160 may inject oxygen directly into the upper layer of the raw material within the second hood 183 using the injector 163. From this, it is also possible to supply only the oxygen directly to the first sintering section, separately from the supply of the exhaust gas of the cooling section 172 to the first sintering section.

The remaining components of the raw material processing apparatus according to another embodiment of the present invention are similar in structure and method to those of the raw material processing apparatus according to the embodiment of the present invention, and thus duplicated description will be omitted.

FIG. 3 is a flowchart showing a raw material treatment method according to an embodiment of the present invention. FIG. 4 is a view illustrating a state of raw material and exhaust gas in a process of treating a raw material using the raw material treatment method according to an embodiment of the present invention Fig.

Hereinafter, a raw material processing method according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. The raw material treatment method is, for example, a method of producing a sintered blend raw material as an sintered ore, comprising the steps of preparing a raw material, charging a raw material into a bogie traveling in one direction, And a process of circulating the gas in different sections of the movement path and supplying the raw material to the cooler and cooling the same. Here, the process of supplying and circulating the gas may include mixing oxygen into the exhaust gas of the cooler and supplying it to at least a part of the sintering section. In this case, the process of charging the raw material into the bogie and performing the heat treatment, the process of circulating the gas in different sections of the movement route, and the process of cooling the raw material by supplying the cooler may be variously changed have. For example, each of the above processes may be performed simultaneously or simultaneously.

On the other hand, the sintering zone is divided into a first sintering zone, a second sintering zone and a third sintering zone in a moving direction of the raw material, and each sintering zone is supplied with gas under different feeding conditions. Thus, the gas can be supplied to each section under conditions suitable for the sintering progress of the raw material and the degree of propagation of the flame in each section, and the raw material can be sintered smoothly. Further, in some of the sintering sections, the exhaust gas is exhausted separately under the different exhaust conditions. Therefore, it is possible to exhaust the exhaust gas in each section under the conditions suitable for the fluctuation of the ventilation resistance according to the sintering section of the raw material, so that the raw material can be sintered smoothly.

First, a raw material is prepared (S100). For example, sintering and blending raw materials having a predetermined particle size are prepared in such a manner that minute iron ores, additives and anthracite coal are mixed and humidified.

Next, the raw material is charged into the bogie 130, which travels along the traveling path in one direction and passes through the charging section of the traveling path, and moves it in the order of the ignition section and the sintering section of the traveling path. In the ignition section and the sintering section, (S200). For example, the bogie 130 moving in one direction is loaded with a predetermined thickness inside the bogie 130 while passing through the charging section. Subsequently, the truck 130 on which the raw material is loaded is moved in the order of the ignition section and the sintering section. The raw material passes through the ignition section, the flame is ignited in the upper layer, the flame passes through the sintering section, and the flame propagates to the lower layer.

The raw material is burned by the flame propagating from the upper layer to the lower layer of the raw material and is heat-treated, for example, sintered. On the other hand, the sintered material, such as sintered ores, is discharged to the cooler 172 and cooled (S400). After cooling, the sintered ores are sorted according to their particle size and classified into semi-spheres having a particle size smaller than an appropriate size from the sintered ores. The sintered ores of the appropriate size can be supplied to the blast furnace, and the semitransparent can be reused as the sintering blend raw material.

Next, along with the heat treatment of the raw material, the gas is supplied to the different sections of the truck and circulated (S300). The details are as follows. A negative pressure is formed in the windbox 140 located in the charging section, the ignition section and the second sintering section to introduce the outside air into the charging section, the ignition section, and the second sintering section S310. At the same time, oxygen is mixed with the exhaust gas of the cooler 172 and supplied to the first sintering section (S320). At the same time, the exhaust gas of the second sintering zone is supplied to the third sintering zone (S330). At the same time, exhaust gas from the charging section, the ignition section, the first sintering section and the third sintering section is discharged to the outside air (S340).

Meanwhile, the first sintering section may extend from the beginning of the sintering section to a point half of the entire section of the tray 130 including the charging section, the ignition section, and the sintering section. In addition, the second sintering zone is a point at which the temperature of the exhaust gas generated in the sintering zone reaches the maximum (BTP) from the point at which the charging section is combined with the ignition section and the sintering section, (BRP) at which the combustion is terminated. The third sintering zone is a zone from the point where the temperature of the exhaust gas generated in the sintering section reaches the maximum temperature (BTP) to the point at which the sintering section ends, or the point at which the combustion of coal contained in the raw material ends (BRP) To the point where the sintering section ends.

Fig. 4 (a) is a schematic view showing the state of the raw material in each section of the sintering section in the course of processing the raw material in a cross-sectional shape of the raw material, and Figs. 4 (b) and 4 (c) Is a schematic view showing the state of the exhaust gas for each sintering section of the raw material so as to correspond to the cross-sectional shape of the raw material.

4 (a) to 4 (c), the sintering completion layer, the combustion zone and the microsphere layer have different aeration resistances. Therefore, the first sintering zone, the second sintering zone and the third sintering zone The ventilation in the section is different, which can be seen as the air volume in each section. Specifically, as shown in Fig. 4 (b), the air volume in each section decreases as the thickness of the combustion zone increases, and increases as the thickness of the combustion zone decreases. Thus, Which is a major factor in determining the air flow rate. Accordingly, in the second sintering zone where the thickness of the combustion zone is relatively thick, the air flow rate can be reduced. Accordingly, in the embodiment of the present invention, the exhaust gas exhausting conditions in the second sintering zone are separately controlled, The air volume can be increased.

As described above, the exhaust gas of the cooler 172 is circulated to the first sintering section in order to improve the sintering efficiency corresponding to the raw material and the state of the exhaust gas in each sintering section during the heat treatment of the raw material, Is circulated to the third sintering zone, oxygen is mixed with the exhaust gas circulated to the first sintering zone and supplied to the first sintering zone.

As the first gas circulation unit 150 that sucks and circulates the exhaust gas in the second sintering zone is separated from the exhaust unit 190 that exhausts the exhaust gas in the remaining section and exhausts the exhaust gas to the outside air, It is possible to control the exhausting conditions differently from the remaining sections such as the charging section, the ignition section, the first sintering section and the third sintering section, and accordingly, the windbox 140 positioned in the second sintering section, It is possible to improve the suction force. From this, the flame propagation and the progress of combustion in the second sintering section can be smoothly performed, the sintering of the raw material can proceed smoothly, and further the quality of the sintered ores can be improved. On the other hand, in order to improve the air permeability of the second sintering section, exhaust gas separately drawn in the second sintering section may be supplied to the third sintering section and utilized for controlling the temperature of the raw material of the third sintering section.

In addition, by mixing oxygen in the exhaust gas of the cooler 172 and circulating it in the first sintering section, the temperature of the upper layer of the first sintering section can be raised to a desired temperature and the combustion efficiency in the upper layer of the raw material can be improved . In the first sintering section, the combustion region of the raw material is formed in the upper layer of the raw material. Therefore, by supplying exhaust gas and oxygen of the cooler 172 to the first sintering section, heat and oxygen are directly supplied to the combustion region of the raw material, The temperature in the combustion chamber can be increased, and the combustion action can be induced more actively.

In this case, the exhaust gas temperature of the cooler 172 may be set to a predetermined temperature, for example, 100 ° C or 130 ° C or more, and the volume ratio of oxygen mixed in the exhaust gas of the cooler 172 may be 40% And a control valve 162 of the second blower 183 and the oxygen supply unit 160, respectively. Here, when the volume ratio of oxygen is more than 40%, the concentration of oxygen is high, so that the propagation speed of the flame surface in the first sintering zone is sharply increased or the exhaust gas of the cooler 172 The raw material may be ignited and exploded. Therefore, in the embodiment of the present invention, the volume ratio of oxygen mixed in the exhaust gas of the cooler 172 is controlled to 40% or less.

Meanwhile, the manner of supplying the exhaust gas of the cooler 172, for example, the cooler exhaust gas and oxygen, during the first sintering section may be variously changed. For example, a method in which the cooler exhaust gas and oxygen are injected simultaneously on the upper side of the first sintering section (see FIG. 2) and independently supplied and mixed in the first sintering section can be applied.

In the above-described raw material treatment method, oxygen is supplied to the first sintering zone so that the combustion zone, for example, the propagation zone of the flame formed in the upper layer of the raw material in the first sintering zone, can be further grown toward the lower layer of the raw material. In addition, the temperature of the combustion region can be further increased, and the temperature of the combustion region in the second sintering section and the third sintering section, which are the subsequent sections, can be maintained at a higher temperature for a long time and the moisture contained in the raw material can be smoothly Can be removed. Accordingly, the amount of the sintered raw material, such as sintered ores, produced in a usable state relative to the input raw material is increased, so that the productivity of the whole process can be improved.

Therefore, the temperature of the upper layer of the raw material can be maintained at a high temperature, the combustion efficiency from the upper layer to the lower layer of the raw material can be improved, and the quality of the sintered raw material such as sintered ores can be improved.

FIG. 5 is a schematic diagram showing an apparatus configured to perform a sintering experiment of raw materials according to Examples and Comparative Examples of the present invention, FIG. 6 is a graph showing the results of sintering experiments of raw materials according to Comparative Examples of the present invention, 7 is a graph showing the sintering test results of the raw material according to the embodiment of the present invention.

Hereinafter, with reference to FIG. 5 to FIG. 7, the experimental procedure and results of the sintering of raw materials according to Examples and Comparative Examples of the present invention will be described. First, as shown in FIG. 5, a raw material 1 is loaded into a port 200 to construct a plurality of sintering test apparatuses. Next, as a comparative example, one of a plurality of sintering test apparatuses is a sintering apparatus (Comparative Example 2) in which a cooler exhaust gas is blown into a raw material upper layer and ignited to ignite the raw material, The raw material is ignited and sintered (Comparative Example 1). The results are shown in Fig.

Next, as an embodiment, the other of the plurality of sintering test apparatuses is a sintering apparatus (example) in which the cooler exhaust gas and oxygen are blown into the upper layer of the raw material together with ignition of the raw material, The raw material is ignited without burning the cooler exhaust gas and oxygen and sintered (Comparative Example 3). The results are shown in Fig. On the other hand, in both of the above experiments, high temperature air of about 250 캜 was used as a cooler exhaust gas.

Experimental conditions of the sintering test according to Comparative Examples 1 and 2 are shown in Table 1 below.

Comparative Example 1 Comparative Example 2 Layered 900 mm Loading density 1888 kg / m ^ 3 Negative pressure 1700mmAq Ignition time / temperature 90 seconds / 1050 DEG C Cooler flue gas blowing time - 4 to 11 minutes Cooler flue gas blowing temperature - 250 ℃ Cooler exhaust gas volume - 322 L / min
(2,382 Nm ^ 3 / min)

Here, the blowing time of the cooler exhaust gas in the comparative example 2 corresponds to the time during which the raw material passes through the first sintering section in the sintering process, for example, the time during which the raw material passes through the No. 8 windbox in the windbox .

Experimental conditions of the sintering experiment according to Comparative Example 3 and Example are shown in Table 2 below.

Comparative Example 3 Example Layered 810 mm Loading density 2106 kg / m ^ 3 Negative pressure 1700mmAq Ignition time / temperature 90 seconds / 1050 DEG C Cooler flue gas blowing time - 4 to 11 minutes Cooler flue gas blowing temperature - 250 ℃ Cooler exhaust gas volume - 322 L / min
(2,382 Nm ^ 3 / min) Oxygen inhalation time - 4 to 11 minutes Oxygen blowing temperature - 250 ℃ Oxygen intake amount - 100 to 140 L / min

5 and 6, when the cooler exhaust gas (hot air) is supplied to the upper layer of the raw material, the range and temperature of the high-temperature region at the position A in FIG. 5 are increased in Comparative Example 2 can see. In Comparative Example 2, the sintering speed (or sintering time) of the raw material at the A position was longer than that of Comparative Example 1, but the sintering speed of the raw material was increased after the B position. This means that the removal rate of the wet zone is increased by the injection of the hot air, and thus the air resistance of the raw sintered layer is reduced. Or, as the sintering quality of the raw material upper layer is improved, the air permeability is improved and the suction flow rate is increased. In the case of Comparative Example 2, the range of the high-temperature region was increased in both A to D positions as compared with the case of Comparative Example 1. Finally, in Comparative Example 2, the time required for reaching BTP is shorter than that of Comparative Example 1. This means that the raw material has been efficiently burned. Thus, it can be seen that the quality of the raw material (sintered ores) from the upper layer to the lower layer of the sintered material of Comparative Example 2 is better than that of Comparative Example 1.

It can also be seen that the exhaust gas temperature in Comparative Example 2 is higher than the exhaust gas temperature in Comparative Example 1. For example, if the temperature of the flue-gas is reduced to less than 130 ° C, the water condenses and the tube that sucks the flue-gas may corrode. Therefore, the temperature of the flue gas should be maintained at 130 ° C or higher. In the case of Comparative Example 2, the temperature of the flue gas is high and it is easy to maintain the flue gas at 130 ° C or higher, and corrosion of the pipe through which the flue gas flows can be prevented.

FIG. 7 shows the results of sintering experiments using oxygen after mixing oxygen with hot air to control the oxygen concentration to about 30%. 5 to 7, it can be seen that the addition of oxygen to the hot air increases the rate of advance of the flame surface (FFS) and increases the sintering speed as compared with the case of blowing only the hot air. In addition, it can be confirmed that the temperature of the sintered layer and the temperature of the exhaust gas further increased. That is, the oxygen supplied to the raw material increases the combustion efficiency, thereby increasing the high temperature region of the raw material upper layer and rapidly evaporating the moisture in the sintered layer, thereby decreasing the aeration resistance in the layer, do. Therefore, it can be expected that both the productivity and the quality of the whole process can be improved by mixing the cooler exhaust gas (hot air) and oxygen. The results are shown in Table 3 below.

Comparative Example 1 Comparative Example 2 Comparative Example 3 Example BTP time 35 minutes 27 seconds 34 minutes 31 seconds 47 minutes 19 seconds 44 minutes 01 second BTP temperature (캜) 457.5 480.1 465.4 540.5 FFS (mm / min) 25.4 26.1 17.1 18.4

It should be noted that the above-described embodiments of the present invention are for the purpose of illustrating the present invention and not for the purpose of limitation of the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the appended claims and their equivalents. You will understand.

110: by ignition 120: charging part
130: Balance 140: Wind box
150: first gas circulation unit 160: oxygen supply unit
172: cooler 180: second gas circulation part
190:

Claims (6)

The process of preparing raw materials;
A step of subjecting the raw material to a pressure in a bogie traveling in one direction of the moving path and moving it in the order of charging zone, ignition zone and sintering zone of the moving path and performing heat treatment;
Supplying and circulating gas in different sections of the movement path; And
And supplying the raw material to a cooler to cool the raw material,
The process of supplying and circulating the gas includes mixing oxygen to the exhaust gas of the cooler and supplying it to the sintering section,
The sintering section is divided into a first sintering section, a second sintering section and a third sintering section in a direction in which the raw material moves,
Wherein the second sintering zone extends from a point half of the entire section of the travel path including the charging section, the ignition section and the sintering section to a point where the temperature of the exhaust gas generated in the sintering section is maximum, . delete The method according to claim 1,
Wherein the first sintering section extends from a point at which the sintering section starts to a point half the entire section of the movement path. delete The method according to claim 1 or 3,
The process of supplying and circulating the gas,
Mixing oxygen in the exhaust gas of the cooler and supplying the mixed gas to the first sintering section; And
And supplying the exhaust gas of the second sintering section to the third sintering section. The method according to claim 1,
Wherein the volume ratio of oxygen mixed in the exhaust gas of the cooler is 40% or less.

Images