KR101862152B1 - Apparatus for manufacturing sintered ore and method for manufacturing sintered ore using the same - Google Patents

Abstract

The present invention relates to a facility for manufacturing a sintered ore, and a method for manufacturing a sintered ore using the same, and comprises: a process of supplying a unit of exhaust gas generated in a process of producing the sintered ore to an upper portion of a sintering vehicle; and a process of supplying cooling fluid to the exhaust gas. Further, the present invention can efficiently cool the sintered ore in the sintering process using exhaust gas circulation.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for manufacturing sintered ores and a method for manufacturing sintered ores using the same,

The present invention relates to an apparatus for manufacturing sintered ores and a method for manufacturing sintered ores using the same, and more particularly, to an apparatus for manufacturing sintered ores that can efficiently cool sintered ores in a sintering process using exhaust gas circulation and a method of manufacturing sintered ores by using the same.

In the process of sinter ore production, fine iron ore is sintered and manufactured to a size suitable for use in a furnace. Generally, in the process of producing sintered ores, sintering blended raw materials obtained by mixing minute iron ores, binders, additives, etc. in a drum mixer together with water are pseudo-particles and charged to a predetermined height on a sintered bogie. Then, the upper surface of the upper layer is ignited by an ignition furnace, and the sintered material is burned from the upper part to the lower part by suction by a large suction fan or the like while the sintering bogie proceeds, thereby producing the sintered ores.

On the other hand, the demand for sintered ores increased due to the increase of blast furnace contents and the increase of sintering ratio. Therefore, in order to increase the sintering power, it is necessary to increase the image area of the sintering machine and increase the suction airflow by the enlarged area. There is a method of increasing the capacity of the suction fan by increasing the suction air volume. However, there is also a problem that investment and maintenance costs are also increased due to the necessity of expansion of the exhaust gas cleaning facility. Thus, a method of circulating the flue gas generated in the sintering machine and securing an insufficient amount of air in accordance with the enlargement of the image area has been used.

A method of circulating exhaust gas in a sintering machine includes providing a hood on at least a part of the upper portion of the sintering machine and supplying a part of the exhaust gas discharged through the windbox to the hood so that exhaust gas supplied to the hood by the suction force of the suction fan Layer is passed through. The position where the exhaust gas is sucked from the sintering machine is mainly a portion where the air resistance of the sintered layer is the largest, and is sucked by the suction fan at high pressure, and the sucked exhaust gas is circulated to the rear end portion of the sintering machine. At this time, since the oxygen contained in the exhaust gas is used for combustion of the solid fuel when passing through the sintered layer, the exhaust gas is circulated to the rear end of the sintering machine having relatively low oxygen consumption.

However, the rear end of the sintering machine in which the exhaust gas is circulated is a section where the sintering of the raw material layer is completed and cooled. Since the temperature of the exhaust gas is extremely high, the temperature of the cooled sintered ores is increased again. Thus, there is a problem that the temperature and the throughput of the sintered ores to be processed in the cooling apparatus for cooling the sintered ores are increased. When the sintered light is not smoothly cooled in the cooling device, the belt conveyor for transferring the sintered light to the subsequent process is spoiled. Therefore, there is a problem that the productivity is lowered as the processing time in the cooling device is increased. In order to improve the cooling efficiency of the cooling device, there is also a method in which cooling water is sprinkled in the sintered light to quench the cooling. In this case, however, the strength of the sintered ores is lowered.

KR 0406395 B KR 1461580 B

The present invention provides an apparatus for manufacturing sintered ores that can prevent or prevent reheating of sintered ores by high-temperature flue gas during the sintering operation using the exhaust gas circulation method, and a method for manufacturing sintered ores using the same.

The present invention provides an apparatus for manufacturing sintered ores that can improve cooling efficiency and productivity of a cooling apparatus, and a method for producing sintered ores using the same.

An apparatus for producing sintered ores according to the present invention comprises: a sintering vehicle which is movable along a moving path and in which a space is formed; A plurality of windboxes disposed along the movement path at a lower portion of the sintering vehicle; A hood extending over at least a part of the movement path on an upper portion of the sintering bogie; An exhaust gas circulation pipe connecting at least a part of the plurality of wind boxes to the hood; And a cooling fluid supply device capable of supplying a cooling fluid to the hood.

The hood may be provided after the region where combustion of the solid fuel is completed among the blended materials charged into the sintered bogie.

The cooling fluid supply device includes: a reservoir capable of storing a cooling fluid; And a nozzle provided inside the hood and communicating with the reservoir.

The exhaust gas circulation pipe may be provided at one side of the hood, and the nozzle may be disposed at a lower position than the exhaust gas circulation pipe.

A method of producing sintered ores according to the present invention is a method of manufacturing sintered ores, comprising the steps of supplying a part of the exhaust gas generated in the process of producing the sintered ores to the upper part of the sintering furnace; And supplying a cooling fluid to the exhaust gas.

The process of supplying a part of the exhaust gas to the upper portion of the sintering vehicle includes the steps of sucking the exhaust gas in a region between a half of the moving path of the sintering vehicle and a point where the temperature of the exhaust gas becomes maximum; Supplying the sucked exhaust gas to a region from an intermediate point of a point where the temperature of the exhaust gas reaches a maximum at a point where combustion of the solid raw material is completed to a region immediately before the light-distribution portion for distributing the sintered light among the blended materials charged into the sintered bogie ; ≪ / RTI >

The process of supplying the sucked exhaust gas may be supplied to the hood provided on the sintered bogie.

The process of supplying the cooling fluid may include the step of injecting the cooling fluid into the hood in a droplet state.

The droplet size of the cooling fluid may be 50 to 100 mu m.

The cooling fluid may include cooling water, and the flow rate of the cooling water may be 10% or less of the water content of the blending raw material.

The sintering apparatus for producing sintered ores according to the present invention and the method for producing sintered ores using the same can prevent reheating of the sintered ores during the sintering operation using the exhaust gas circulation method. That is, it is possible to prevent the sintered light from being reheated by the exhaust gas by supplying the water before the exhaust gas is supplied to the sintering machine to cool the exhaust gas. Therefore, the temperature of the sintered light to be charged into the cooling device is lowered to improve the cooling performance of the cooling device, thereby improving the productivity of the sintered ores.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view of an apparatus for producing sintered ores according to an embodiment of the present invention; FIG.
FIG. 2 is a schematic view showing a structure of a hood installed in an exhaust gas circulation zone in the sintering plant shown in FIG. 1. FIG.
FIG. 3 is a graph showing the exhaust gas temperature, the oxygen concentration in the flue gas, and the temperature distribution inside the sintering vessel in a sintering section of a general sintering plant.
4 is a graph showing a temperature change of sintered ores in a sintering vessel in an exhaust gas circulation section of an apparatus for producing sinter ores according to an 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.

FIG. 1 is a view showing an apparatus for producing sintered ores according to an embodiment of the present invention, and FIG. 2 is a view schematically showing the structure of a hood installed in an exhaust gas circulation section in the sintering apparatus shown in FIG.

Referring to FIG. 1, an apparatus for producing sintered ores includes a plurality of sintered bogies 200 arranged in one direction to be movable and provided with a space for heat-treating a blend material therein, Air is drawn in the lower direction of the sintering bogie 200 and the ignition path 130 for spraying the flame on the blended raw material charged in the sintering bogie 200 And a plurality of windboxes 121 disposed along the movement path 120 below the sintering bogie 200 to sinter the blend material. The sinter orbital production facility includes a hood 310 extending over at least a part of the movement path 120 at the upper part of the sintering bogie 200 and a waste gas circulation system 300 for connecting at least a part of the plurality of wind boxes to the hood 310, And a flue gas circulation unit 300 including a pipe 320. The exhaust gas circulation unit 300 may include a cooling fluid supply device for supplying a cooling fluid to the hood 310. [ The cooling fluid may include cooling water. Hereinafter, an example in which the cooling fluid is cooling water is described, and the cooling fluid supply device is referred to as a cooling water supply device 400. [

The raw material supply part 110 may be provided on one side of the movement path 120 to charge the raw material to the sintered bogie 200. The ignition furnace 130 is connected to the raw material supply part 110, respectively. In addition, a plurality of wind boxes 121 may be provided at the lower part of the upper side movement path to suck the inside of the sintering bogie from the lower part of the ignition section to the sintering section. The wind box 121 forms a negative pressure and sucks the inside of the sintered bogie 200 to form a flow of air from the upper part to the lower part of the raw material layer inside the sintered bogie 200 to sinter the raw material.

A duct 122 is connected to the end of the wind box 121 and a first suction fan 124 is installed at the end of the duct 122 to form a negative pressure inside the wind box 121, As shown in Fig. The duct 122 is provided with an eleventh dust collector 123 in front of the first suction fan 124 to filter impurities from a part of the exhaust gas sucked through the wind box 121, Can be discharged. The wind box 121 sucks the outside air to ignite the surface layer of the raw material for sintering and to burn the raw material for sintering so that the sintered ores can be produced.

The flue gas circulation unit 300 includes a hood 310 provided at an upper portion of the sintering bogie 200 at least a part of the movement path 120 and a hood 310 connected to at least one of the plurality of wind boxes 121, And a second suction fan 328 connected to the exhaust gas circulation pipe 320 and the exhaust gas circulation pipe 320 for transferring the exhaust gas discharged through the wind box 121 to the hood 310 can do. At this time, a chamber (not shown) for collecting the exhaust gas discharged from the wind box 121 may be provided at one side of the flue gas circulation pipe 320, and a chamber (not shown) may be provided at one side of the second suction fan 328, A second dust collector 329 may be disposed behind the second suction fan 328.

The exhaust gas circulating unit 300 may circulate at least a part of the exhaust gas so that it can be reused for producing the sintered ores in the process of sintering the raw material mixture. The exhaust gas circulation unit 300 may be provided to collect and circulate exhaust gas generated in various regions where sintered ores are produced. For example, the exhaust gas circulation unit 300 may be provided to circulate the sintering section or the sintered light by a cooling device for cooling the exhaust gas according to the temperature, the component (oxygen concentration, etc.) of the exhaust gas.

The cooling water supply device 400 is provided in the exhaust gas circulation unit 300 and can supply cooling water to the inside of the hood 310 of the exhaust gas circulation unit 300. The cooling water supply device 400 includes a reservoir 410 for storing cooling water, a transfer pipe 420 provided to cross the inside of the hood 310, a transfer pipe 420 for spraying cooling water into the hood 310, And a pump 430 for supplying pressure to spray the cooling water stored in the reservoir 410 at a high pressure. At this time, at least one transfer pipe 420 may be provided to extend along the width direction or the longitudinal direction of the hood 310, and the pump 430 may be provided to the transfer pipe 420.

The hood 310 may be provided in a predetermined area of the sintering machine such as a cooling section where the sintered ores are cooled and the nozzle 422 may be provided in the sidewall of the transfer pipe 420 And a plurality of spaced apart portions may be provided along the longitudinal direction.

The flue gas circulation pipe 320 for supplying flue gas to the hood 310 may be provided at one side of the hood 310 and the nozzle 422 may be disposed at a position lower than the flue gas circulation pipe 320 inside the hood 310 . This is for cooling the exhaust gas before the flue gas introduced into the hood 310 is supplied to the sintering bogie 200.

The reason for spraying the cooling water in the exhaust gas circulation will be described below.

FIG. 3 is a graph showing the exhaust gas temperature, the oxygen concentration in the exhaust gas, and the internal temperature distribution of the sintered bogie in a sintering section of a general sintering plant; and FIG. 4 is a graph showing the sintering temperature FIG. 5 is a graph showing the temperature change of the sintered ores in the bogie. FIG.

Referring to FIG. 3, the temperature of the exhaust gas in the wind box and the temperature inside the sintered bogie can be known in a sintering section of a general sintering plant. The temperature changes inside the sintered bogie were derived based on the change of the exhaust gas temperature in the wind box and the change of oxygen concentration in the exhaust gas.

First, the temperature of the exhaust gas and the oxygen concentration in the exhaust gas are measured in a sintering section by using a detecting unit installed in a wind box, that is, a temperature measuring instrument and an oxygen concentration measuring instrument, and an exhaust gas temperature curve (hereinafter referred to as WTC: Waste gas Temperature Curve) Can be derived.

The solid fuel is burned until the combustion unit reaches the bottom of the sintering bogie after ignition in the ignition furnace, so oxygen is exhausted and the oxygen concentration in the exhaust gas is reduced to maintain the constant value. When the combustion is completed to the bottom of the sintered bogie, the oxygen concentration in the exhaust gas rises sharply and becomes equal to the oxygen concentration in the outside air introduced by the suction force of the wind box.

Since the solid fuel in the blend material is combusted while air is supplied by the suction force of the first suction fan and the high-temperature exhaust gas moves to the lower part, the burning band becomes thicker toward the sintering vehicle traveling direction. When the combustion zone touches the bottom of the sintering bogie, there is no mixing material layer. Therefore, the high-temperature exhaust gas is directly sucked into the wind box, the temperature of the exhaust gas starts to rise at T1, and the combustion of the solid fuel is completed, For example, 18%, is formed, and the T3 position, which is the position where the exhaust gas temperature is the highest, is formed by the sensible heat of the red light due to the expansion of the combustion zone. At this time, the air sucked from after the end of combustion of the solid fuel serves to cool the red light.

In the present invention, the exhaust gas is sucked in a region between approximately half of the moving path of the sintered bogie and at a point (T3) where the temperature of the exhaust gas becomes maximum, and the combustion of the solid raw material in the blended raw materials charged into the sintered bogie is completed The exhaust gas sucked in the region from the intermediate point T2 at the point T3 at which the temperature of the exhaust gas reaches the maximum at the point T1 to just before the light-distribution portion for distributing the sintered light is supplied. Therefore, since the temperature of the flue gas becomes very high, a high-temperature flue gas is supplied to the sintered ores where cooling is performed after most of the sintering is completed.

However, the sintered ores must be distributed after a certain degree of cooling, but they are reheated by the circulation of the exhaust gas. Accordingly, in the present invention, a nozzle 422 for injecting cooling water is provided in a section for supplying exhaust gas, that is, a section where the hood 310 is formed, so that circulation of high temperature exhaust gas to the sintering machine can be suppressed or prevented.

When cooling water is sprayed into the hood 310, the temperature of the exhaust gas can be lowered as the cooling water is made of superheated steam by the high-temperature exhaust gas supplied to the hood 310. The flue gas and the superheated steam having the lowered temperature can penetrate into the sintered light inside the sintering drum to efficiently cool the sintered light in the red state.

At this time, the cooling water injected into the hood 310 may be sprayed in the form of droplets or mist, and may be sprayed so as to have a size of about 50 to 100 mu m so as to be evaporated by the heat of the exhaust gas.

Further, the flow rate of the cooling water injected into the hood 310 can be supplied at about 10% or less, for example, about 50 to 60 L / s / m 2 of the water content of the blend raw material. This is because if the flow rate of the cooling water is excessively large, steam can not be formed in the hood 310 or in the process of passing the sintered light, and the cooling water itself can flow out to the windbox 121. In this case, the cooling water flows into the second dust collector (329) connected to the wind box (121), thereby reducing the performance of the dust collector and lowering the dust collection efficiency.

Hereinafter, a method for producing sintered ores according to an embodiment of the present invention will be described.

A method for producing sintered ores according to an embodiment of the present invention includes the steps of preparing a raw material for sintering, forming a raw material layer by charging the raw material for sinter into a sintering vehicle, igniting a surface layer of the raw material layer, And a step of supplying a part of the flue gas generated in the process of producing the sintered ores to the upper part of the sintering bogie and supplying the cooling water to the flue gas.

A plurality of sintering carts 200 are passed through a material supply unit 110 to charge the upper light and the compounding material into each of the plurality of sintering carts 200 to form a raw material layer. Each of the plurality of sintering bogies 200 sequentially passes under the ignition furnace 130 while a flame is ignited on the surface layer of the raw material layer and the sintering bogie 200 moves along the movement path 120 while sintering the raw material layer .

A part of the exhaust gas generated in the process of sintering the raw material layer can be sucked through the second suction fan 328 and supplied to the upper part of the sintering carriage 200. At this time, the exhaust gas is sucked in a region between about a half of the moving path of the sintered bogie and the point where the temperature of the exhaust gas becomes maximum, and at the point where combustion of the solid raw material among the blended raw materials charged in the sintered bogie is completed, It is possible to supply the exhaust gas sucked in the region from the intermediate point of the point where the temperature becomes maximum to just before the light-distribution portion for distributing the sintered light.

The flue gas can be supplied through the hood 310 provided on the sintering bogie 200 and the cooling water can be supplied into the hood 310 in the process of supplying the flue gas to the hood 310. The cooling water can be injected into the hood 310 in a droplet state, and the cooling water injected into the hood 310 can cause the superheated steam to be generated by the sensible heat of the exhaust gas, thereby lowering the temperature of the exhaust gas. At this time, the cooling water can be sprayed so as to have a droplet size of about 50 to 100 mu m so that steam can be generated quickly. Further, the cooling water can be supplied at a flow rate of about 10% or less with respect to the moisture content of the compounding raw material. When the cooling water is excessively supplied, some of the cooling water can not be formed as vapor but passes through the sintered light. The cooling water having passed through the sintered light flows into the wind box 121 and is connected to the wind box 121, It may flow into the second dust collector 329 provided in the pipeline 320 to lower the performance of the second dust collector 329 and reduce the dust collection efficiency.

The cooled exhaust gas and the superheated steam can be cooled by passing the sintered bogie 200 sintered light.

4 is a graph showing a temperature change of a sintered ore in a sintering vessel in an exhaust gas circulation section of an apparatus for producing sinter ores according to an embodiment of the present invention.

Fig. 4 shows the temperature distribution inside the sintered ores when the exhaust gas is supplied to the sintered ores and the cooling water is further supplied in the process of supplying the sintered ores. It can be seen that the temperature of the sintered ores is generally higher than when the cooling water is further supplied when the exhaust gas of high temperature is directly supplied to the sintered ores. Particularly, the temperature difference gradually decreases from the upper portion to the lower portion of the sintered bogie, but the temperature of the sintered ores is lowered by an average of about 100 ° C except for a part of the sintered ores located at a part of the glowing layer, have.

As a result, it can be seen that when the cooling water is further supplied when the flue gas is supplied, the sintered light is humidified by the cooling water, that is, steam, as well as the temperature of the flue gas is lowered. Thus, the cooling efficiency of the cooling device for cooling the sintered light by cooling the sintered light to be lighted can be improved, and the productivity of the sintered ores can be improved.

Although the present invention has been described with reference to the accompanying drawings and the preferred embodiments described above, the present invention is not limited thereto but is limited by the following claims. Accordingly, those skilled in the art will appreciate that various modifications and changes may be made thereto without departing from the spirit of the following claims.

110: Feedstock supply unit 120:
121: Wind box 130: by ignition
200: Sintering ladle 300: Flue gas circulation part
310: Hood 320: Flue gas circulation piping
400: Cooling water supply device

Claims (10)

A sintering carriage movable along the movement path and having a space formed therein;
A plurality of windboxes disposed along the movement path at a lower portion of the sintering vehicle;
A hood extending over at least a part of the movement path on an upper portion of the sintering bogie;
An exhaust gas circulation pipe connecting at least a part of the plurality of wind boxes to the hood; And
A cooling fluid supply device including a nozzle capable of injecting a cooling fluid into the interior of the hood;
Lt; / RTI >
Wherein the hood is provided after a region of combustion of the solid fuel charged in the sintered bogie is completed,
The exhaust gas circulation pipe is provided at one side of the hood and the nozzle is disposed at a lower position than the exhaust gas circulation pipe so that the exhaust gas flowing into the hood can cool the exhaust gas before supplying the sintered bogie. . delete The method according to claim 1,
The cooling fluid supply device includes:
A reservoir capable of storing a cooling fluid;
A transfer pipe connected to the reservoir and provided to cross the inside of the hood so as to install a plurality of the nozzles; And
And a pump for providing a pressure to spray the cooling water stored in the reservoir. delete A method for producing an sintered ore,
A step of supplying a part of the flue gas generated in the process of producing the sintered ores to the hood provided on the sintering carriage; And
And supplying a cooling fluid to the exhaust gas,
The process of supplying a part of the exhaust gas to the upper part of the sintering bogie,
A step of sucking the exhaust gas in a region between a half of the moving path of the sintered bogie and a point where the temperature of the exhaust gas becomes maximum;
Supplying the sucked exhaust gas to a region from an intermediate point of a point where the temperature of the exhaust gas reaches a maximum at a point where combustion of the solid raw material is completed to a region immediately before the light-distribution portion for distributing the sintered light among the blended materials charged into the sintered bogie ≪ / RTI >
The process for supplying the cooling fluid to the flue gas may include a step of supplying the cooling fluid to a position lower than a position at which the flue gas flows into the hood so that the flue gas introduced into the hood may be cooled before being supplied to the sintered bogie, Gt; delete delete The method of claim 5,
The process of supplying the cooling fluid includes:
And injecting a cooling fluid into the hood in a droplet form or a mist form. The method of claim 8,
And the droplet size of the cooling fluid is 50 to 100 mu m. The method of claim 5 or claim 9,
Wherein the cooling fluid comprises cooling water,
Wherein the flow rate of the cooling water is 10% or less with respect to the water content of the blended raw material.

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