KR101461580B1 - Apparatus for manufacturing sintered ore and method for manufacturing sintered ore using the same - Google Patents

Abstract

The present invention relates to an apparatus for producing sintered ore and a method for manufacturing sintered ore using the same. The apparatus includes: a plurality of sintering carts which move along a pathway and allow a raw material layer to be charged thereinto; an ignition part which is installed on one side of an upper part of the pathway and sprays flame to the raw material layer in the sintering cart; an ore discharging part which is installed on the other side of the pathway and discharges sintered ore on which a sintering process is completed; a wind box which is arranged on the pathway between the ignition part and the ore discharging part; and a heat adjuster which is arranged on an upper part of the pathway between the ignition part and the ore discharging part, and provides heat and moisturized air to the raw material layer. Therefore, the apparatus can increase quality and productivity of the sintered ore by controlling the amount of heat in the raw material layer to be constant during a sintering process.

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. More particularly, the present invention relates to an apparatus for manufacturing sintered ores that can uniformly control the amount of heat in a raw material layer during sintering to improve the quality and productivity of the sintered ores, ≪ / RTI >

In the process of sinter ore production, fine iron ore is sintered and manufactured to a size suitable for use in a furnace. In this sintering process, mixing and humidity (raw material weight ratio of about 7 ~ 8%) is put into a drum mixer to mix minute iron ore, additives and solid fuel (minute coke, anthracite) The surface is ignited by an ignition furnace, and air is forcedly sucked from below, and when the sintering of the raw material for sintering proceeds, the sintered ores are produced. The produced sintered ores are cooled in a cooler through a crusher of the light pipe and classified to a granular size of 5 to 50 mm which is easy to be charged and reacted in the blast furnace and transferred to the blast furnace.

Fig. 1 shows an apparatus for producing sinter ores.

The upper light stored in the upper light hopper 10 and the sintered raw material stored in the surge hopper 20 are transported in the sintering vehicle and are transported while the moving sintering vehicle 50 passes under the ignition path 30. At this time, a flame (that is, a flame) injected from the ignition furnace 30 is ignited on the surface of the sintered raw material accommodated in the sintered bogie 50, that is, the surface layer. The bogie that has passed through the ignition furnace 30 is transported by the transfer device 40 in the process advancing direction. At this time, the sintered bogie 50 passes over the upper side of the plurality of windboxes 70 arranged in the process- do. A suction force is generated in the downward direction on the sintered bogie 50 passing through the upper side of the wind box 70 and the flame ignited by the sucked outside air is moved downward. When the sintered bogie 50 arrives at the wind box 70 located at the end of the process progression, the flame reaches the bottom of the sintered bogie and the sintering is completed, and the operation of the sintered bogie 50 is continued Lt; / RTI >

However, when the sintered ores are produced by using such a facility, there is a difference in the distribution of heat along the depth direction of the raw material layer. That is, in the upper layer portion of the raw material layer, the amount of heat is insufficient due to the inflow of outside air by the suction force of the wind box 70, the outside air is heated by passing through the combustion zone of the fuel layer and is continuously supplied to the lower layer, A phenomenon occurs. After completion of the sintering process, the surface area of the upper layer is increased to produce the sintered ores having an excellent reducing power, but the lower layer is solidified after melting the raw material layer. There is a problem.

In order to solve the problem of quality fluctuation of the sintered light along the height direction of the sintered bogie, oxygen, gaseous fuel, liquid fuel and the like are supplied to the upper layer of the raw material layer in the sintering process, A method of forming a uniform combustion zone in the raw material layer by controlling the amount of heat uniformly throughout the whole is being used. However, when the liquid fuel is supplied, there is a danger of explosion. When the amount of the solid fuel is decreased, the combustion of the raw material layer is not performed properly in the upper part, so that the insufficiency of heat in the upper part is further deepened, . Further, when oxygen or gaseous fuel is supplied to the upper layer of the raw material layer, there is not proposed a method of measuring the precise thickness or depth of the combustion chamber in the raw material layer during the sintering process. Therefore, there is a problem that the thickness or the depth of the combustion zone formed in the raw material layer can not be accurately controlled because the oxygen or gaseous fuel supply region is not established.

KR2011-42353A KR2010-98718A KR2012-130260A KR1998-46290A

The present invention provides an apparatus for manufacturing sintered ores and a method for manufacturing sintered ores using the same, which can control the amount of heat generated by the raw material layer during the sintering operation and the amount of heat overflow in the raw material layer.

The present invention provides an apparatus for manufacturing sintered ores that can reduce the amount of solid fuel used and reduce the production cost, and a method for manufacturing sintered ores by using the same.

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

An apparatus for producing sintered ores according to the present invention includes: a plurality of sintering carts which are movable along a moving path and in which a raw material layer is loaded; An ignition means provided at an upper side of the movement path for spraying a flame on a raw material layer in the sintered bogie; A light-splitting unit installed on the other side of the movement path and discharging the sintered light that has been sintered; A wind box provided between the ignition passage and the light-splitting section in the movement path; And a calorie regulator provided between the ignition path and the light-splitting section at an upper portion of the movement path, for supplying a heat quantity and a humidifying air to the raw material layer.

Wherein the calorific value regulator includes an oxygen supply device for supplying a gas containing oxygen to the raw material layer, a gas fuel supply device provided at one side of the oxygen supply device for supplying gaseous fuel to the raw material layer, And a humidifying air supply unit provided at one side of the apparatus for supplying humidified air to the raw material layer.

The oxygen supply device includes an oxygen reservoir for storing oxygen, a first hood which surrounds the upper portion of the sintered bogie at the upper part of the movement path and has a through hole formed in the upper surface thereof, And a first nozzle for supplying the water into the first hood.

The gaseous fuel supply apparatus includes a gaseous fuel reservoir for storing gaseous fuel, a second hood provided at the upper portion of the movement path to surround the upper portion of the sintered bogie and having a through hole formed in the upper surface thereof, And a second nozzle for supplying oxygen stored in the second hood to the inside of the second hood.

The second hood may be spaced apart from the first hood.

The oxygen supply device, the gaseous fuel supply device, and the humidifying air device may be sequentially provided along the moving direction of the sintered bogie.

Wherein the gaseous fuel supply device is provided in an area within 1/3 of the movement path between the light shading part in the ignition path, and the oxygen supply device is provided in an area of 1/4 to 1/2 Area.

The second hood is formed to space-divide the inner space of the second hood into a plurality of spaces along the width direction of the sintered bogie, and a second nozzle may be connected to each of the separated spaces of the second hood.

The plurality of second hoods may be disposed along the moving direction of the sintered bogie, and the plurality of second hoods may be spaced apart from each other.

The length of the second hood may be 2 to 4 times longer than the distance between the second hood.

The humidifying air supply device includes a moisture reservoir for storing moisture, a third hood which surrounds the upper portion of the sintered bogie at the upper part of the movement path and has a through hole formed in the upper surface thereof, To the inside of the third hood.

The humidifying air supply device may be provided behind the light shading portion with respect to the moving direction of the sintered bogie.

The method for producing sintered ores according to the present invention comprises the steps of: preparing a raw material for sinter; Forming a raw material layer by charging the raw material for sinter into a moving sintering vehicle; Igniting the raw material layer; Supplying a quantity of heat to the raw material layer; A step of supplying humidified air to the sintered ores produced by sintering the raw material for sinter to cool the sintered ores; And a step of distributing the sintered ores.

In the process of preparing the sintering raw material, the content of the solid fuel contained in the sintering raw material may be 3.5 to 4.5% by weight based on the total weight of the raw material for sintering.

The process of supplying the heat may include supplying a gas containing oxygen to the raw material layer and supplying gaseous fuel to the raw material layer supplied with the oxygen containing gas.

The process of supplying oxygen may be performed after the process of igniting the raw material layer.

In the process of supplying oxygen, the oxygen may be supplied to the raw material layer at a concentration of 21 to 30% by mixing with the outside air.

Wherein the step of supplying oxygen and the step of supplying gaseous fuel are carried out by measuring the temperature of the exhaust gas generated while the raw material for sinter is burned and the oxygen concentration in the exhaust gas, And can be performed in an area where combustion is proceeding.

The process of supplying oxygen may be performed until the temperature of the combustion zone formed in the raw material layer reaches the minimum combustion temperature of the gaseous fuel.

The process of supplying the gaseous fuel may be performed such that the concentration of the gaseous fuel becomes lower than the combustion temperature of the combustion zone.

The process of supplying the gaseous fuel can alternately and repeatedly supply the gaseous fuel and the outside air.

The section for supplying the gaseous fuel during the supply of the gaseous fuel may be longer than the section for supplying the outside air.

The gaseous fuel may be at least one of liquefied natural gas (LNG), coke oven gas, and blast furnace gas.

The process of supplying the humidifying air may be performed after completion of the combustion of the raw material for sinter located at the bottom of the sintered bogie and immediately before the distribution of the sintered ores.

The sintering apparatus for producing sintered ores according to the present invention and the method for producing sintered ores using the same can suppress or prevent the phenomenon of heat quantity unevenness occurring in the depth direction of the raw material layer during sintering operation. In other words, it is possible to suppress or prevent the decrease in the strength of the sintered ores due to the heat deficiency phenomenon occurring in the upper portion of the raw material layer and the decrease in the reducibility of the sintered ores due to the excessive heat phenomenon occurring in the lower portion of the raw material layer, Of course, the productivity of the sintered ores can be improved. Therefore, the process efficiency and productivity of the operation in which the sintered ores are used, such as blast furnace operation, can be improved.

In addition, since the content of the solid fuel in the raw materials for sintering can be reduced, not only resource saving but also environmental pollution caused by exhaust gas can be suppressed.

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 view showing a configuration of a sintering section in the sintering apparatus shown in FIG. 1; FIG.
FIG. 3 is a schematic view illustrating a structure of a calorie regulator installed in a sintering section shown in FIG. 2. FIG.
FIG. 4 is a view showing a result of measuring a side temperature of a sintered bogie in a general sintering plant; FIG.
5 is a graph showing an exhaust gas temperature of an air conditioner, an oxygen concentration in an exhaust gas, and a temperature distribution inside a sintering furnace in a sintering section of a general sintering plant.
FIG. 6 is a graph showing a change in temperature of a raw material layer in a sintered compact in a sintering section of an apparatus for manufacturing sintered ores according to an embodiment of the present invention. FIG.
FIG. 7 is a graph showing lateral temperature changes of a sintered bogie according to oxygen concentration in a sintering zone. FIG.
8 is a view showing a temperature distribution on the side of a sintered bogie according to the supply of gaseous fuel in a sintering section.
9 is a graph showing a temperature change inside the raw material layer with respect to a width direction of a sintering direction in a sintering section of a general sintering furnace manufacturing facility.
10 is a graph showing a side surface temperature change of a sintered bogie according to oxygen concentration in a sintering section of an apparatus for producing sinter ores according to an embodiment of the present invention.
11 is a view showing a temperature change inside a raw material layer according to a supply of gaseous fuel in a sintering section of an apparatus for producing sinter ores according to an embodiment of the present invention.
12 is a flowchart sequentially illustrating a process of producing sintered ores by the method of manufacturing sintered 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 a sintering plant according to an embodiment of the present invention. FIG. 2 is a schematic view showing a sintering section of a sintering plant shown in FIG. 1. FIG. FIG. 2 is a schematic view showing a structure of a gaseous fuel supplier among calorie regulators installed in a fuel tank; FIG.

Referring to FIG. 1, an apparatus for producing sintered ores is composed of an upper light hopper 10 in which upper light is stored in a lower surface of a sintered bogie, a coke used as a solid fuel, A sintering hopper 20 for storing a raw material mixture, a plurality of sintering bogies 50 accommodated in a sintering raw material so as to be movable in one direction, a transfer device 40 for transferring a plurality of sintering bogies 50 in a process advancing direction, An ignition furnace 30 provided on the upper side of the transfer device 40 on one side of the surge hopper 20 for spraying a flame on the surface layer of the sintering raw material in the sintered bogie and on the movement path of the sintered bogie 50 And a plurality of windboxes (70) for sucking the inside of the sintering truck (50). In addition, the sinter ore manufacturing facility may include a sintering raw material in the sintering vehicle, that is, a calorimeter 100 for controlling the amount of heat in the raw material layer. The sintered ores manufacturing facility includes a detector for measuring the temperature of the exhaust gas and the concentration of oxygen in the exhaust gas generated in the raw box by burning in the wind box 70 and the calorie regulator 100 using the result detected by the detector. Lt; RTI ID = 0.0 > a < / RTI >

Here, the movement path of the sintering bogie 50 forms a closed loop such that the sintering bogie 50 rotates in an endless track manner. In the upper side movement path, the sintering raw material in the sintering bogie 50 is sintered, The lower side movement path is a rotation interval for moving the sintered bogie 50 to which the sintered light is shined, to the upper side movement path for the sintering process. At this time, the upper light hopper 10, the surge hopper 20, and the ignition path 30 are provided on the upper side movement path, and the wind box 70 is provided on the lower side of the upper side movement path, So that the inside of the sintered bogie 50 moving along is attracted. The sintered light that has been sintered in the sintered bogie is shined in the process of moving the sintered bogie 50 from the upper side movement path to the lower side movement path and this region is referred to as a light distribution portion 60 and the light distribution portion 60 And is located on the opposite side of the ignition path 30 in the upper side movement path.

The sintering raw material refers to a blend raw material provided from the upper light provided from the upper light hopper 10 and the surge hopper 20 and is referred to as a raw material layer after the raw material for sinter is charged into the sintering bogie 50.

The upper light hopper 10 is provided at an upper portion of one side of the upper side movement path of the sintered bogie 50 and charges the upper light to prevent the sintered raw material formed at the bottom of the sintered bogie 50 from flowing out . The upper light means that sintered ores having a particle size of about 8 to 15 mm are selected from among the sintered ores.

The surge hopper 20 is provided in front of the upper light hopper 10, that is, in front of the movement path of the sintering bogie 10, and loads the sintering raw material for producing the sintered light into the sintering bogie. The surge hopper 20 uniformly loads the raw material for sintering in the width direction of the sintered bogie without segregation and segregation so that the grain size becomes smaller toward the upper part in the depth direction of the sintered bogie.

The ignition furnace 30 is provided in front of the surge hopper 20 to supply a sintering raw material to the surface layer of the raw material layer formed by charging the sintering vehicle 50 to ignite.

The wind box 70 sucks the inside of the sintered bogie 50, which is provided along the movement path of the sintering bogie, more specifically, below the upper side movement path and moves along the upper side movement path. The wind box 70 may be provided between the ignition furnace 30 and the light shading section 60. A blower 84 is installed at the end of the duct 80 to form a negative pressure inside the wind box 70 so that the sintered bogie 50 So that the inside can be sucked. The duct 80 is provided with a dust collector 82 in front of the blower 84 so that the impurities in the exhaust gas sucked through the wind box 70 can be filtered and discharged through the chimney 86. The wind box 70 sucks the outside air to ignite the surface layer of the raw material for sintering and burn the raw materials for sintering so that the sintered ores can be produced.

The calorific value adjuster 100 is disposed in front of the ignition line 30 with respect to the movement direction of the sintered bogie and is disposed in front of the oxygen supply device 110 for supplying oxygen to the raw material layer, A gaseous fuel supply device 120 for supplying gaseous fuel to the sintering material in the sintering bogie and a humidifying air supply device 130 for supplying humidifying air to the sintering material in the sintering vehicle, ). Here, the oxygen supply device 110 and the gaseous fuel supply device 120 are configured to control the amount of heat of the upper layer of the raw material layer, and the humidifying air supply device 130 is configured to control the amount of heat of the lower layer of the raw material layer. The oxygen supply device 110, the gaseous fuel supply device 120, and the gas air supply device 130 may be sequentially provided along the movement path of the sintered bogie on the movement path of the sintered bogie.

The oxygen supplying device 110 serves to increase the temperature of the raw material layer by supplying oxygen to the raw material layer in front of the ignition furnace and keeping the ignited heat in the ignition furnace for a predetermined time. Thereby facilitating the combustion of the gaseous fuel supplied from the gaseous fuel supply device 120.

The oxygen supply device 110 includes an oxygen reservoir 112 for storing oxygen, a first hood 114 provided to surround the upper portion of the sintering bogie at the upper part of the movement path, And a second nozzle 116 for supplying the first nozzle 114 to the first hood 114. [

The gaseous fuel supply device 120 supplies gaseous fuel to the raw material layer to supply heat to the combustion zone formed in the raw material layer. At this time, at least one of liquefied natural gas (hereinafter referred to as "LNG"), coke oven gas and blast furnace gas may be used as the gaseous fuel, but considering the heat quantity, cost and safety, It is preferable to use LNG which generates high heat and does not discharge CO gas.

 The gaseous fuel supply apparatus 120 includes a gaseous fuel reservoir 122 for storing gaseous fuel, a second hood 124 provided to surround the upper portion of the sintered bogie at the top of the movement path, And a second nozzle 126 for supplying gaseous fuel stored in the second hood 124 to the inside of the second hood 124. The gaseous fuel supply device 120 may be provided in an area within 1/3 of the movement path between the light-guiding parts in the ignition path, that is, in the sintering section. In other words, the gaseous fuel supply device 120 may be provided over an area corresponding to 1/3 of the total length of the sintered bogie. In addition, the gaseous fuel supply device 120 may be formed over a region that is 2 to 4 times larger than the region where the acid feeder 110 is formed in the sintering section. This is because the gaseous fuel supply device 120 substantially serves to provide heat to the interior of the raw material layer, and the oxygen supply device 110 is installed in a region of 1/4 to 1/2 of the region where the gaseous fuel supply device 120 is installed. Area.

A plurality of second hoods 124 may be disposed along the sintering section. At this time, the second hood 124 adjacent to the first hood 114 of the oxygen supply device 110 may be spaced apart from the first hood 114. This is to ensure the time for the solid fuel in the sintering raw material to burn sufficiently due to the oxygen supply. The reason why the plurality of second hoods 124 are arranged to be spaced apart is to supply the oxygen required when the gaseous fuel flowing into the raw material layer through the second hood 124 is burned. That is, by supplying the gaseous fuel through the second hood 124 and supplying the outside air, that is, oxygen through the space between the second hood 124, the gaseous fuel is not burned, Can be suppressed. At this time, the region where the gaseous fuel is supplied (the length of the second hood 124) may be formed to be two to four times longer than the region where the outside air is supplied (the space length between the second hoods 124). By this configuration, the outside air and the gaseous fuel can be repeatedly introduced into the raw material layer, thereby enabling the complete combustion of the gaseous fuel, thereby ensuring a sufficient amount of heat for burning the raw material for sinter.

In addition, as shown in FIG. 3, the second hood 124 may have partition walls 125 formed along the width direction of the sintered bogie. The inner space of the second hood 124 can be divided into a plurality of spaces along the width direction of the sintered bogie. The second nozzle 126 is connected to each of the separated spaces of the second hood 124 to supply different amounts of gaseous fuel to the respective regions. Accordingly, the temperature deviation in the raw material layer occurring along the width direction and the depth direction of the sintered bogie can be suppressed or prevented. This will be described later.

The humidifying air supply device 130 may be installed in a region where the sintered light is cooled until the sintered light is sintered to the light distribution portion. The humidifying air supply device 130 includes a moisture reservoir 132 for storing moisture, a third hood 134 provided to surround the upper portion of the sintered bogie at the upper part of the movement path, And a third nozzle 136 for supplying moisture into the third hood 134.

The upper surface of the first hood 114, the second hood 124 and the third hood 134 may be formed as a perforated plate having a through hole 123 as shown in FIG. 3, The outside air in the hood and the oxygen, gaseous fuel, and moisture supplied from each nozzle can be mixed into the raw material layer. (Although the case of the second hood is shown in Fig. 3, a through hole may be formed on the upper surfaces of the first hood and the third hood)

Through such a construction, the sintering facility can uniformly form the heat quantity distribution of the combustion zone formed in the raw material layer in the sintering process, thereby improving the quality and productivity of the sintered ores.

Hereinafter, a method for determining the installation position of the calorie regulator, that is, the oxygen supply device, the gaseous fuel supply device, and the humidifying air supply device will be described.

FIG. 4 is a graph showing the result of measurement of the side temperature of a sintered bogie in a general sintering plant. FIG. 5 is a graph showing the relationship between the exhaust gas temperature of the wind, the oxygen concentration in the exhaust gas, And FIG. 6 is a graph showing a temperature change of a raw material layer in a sintering vessel in a sintering section of an apparatus for producing sinter ores according to an embodiment of the present invention. Here, the raw material layer in the sintered bogie can be divided into an upper layer portion, an intermediate layer portion and a lower layer portion. In the entire depth of the raw material layer, the upper layer from the surface layer to the lower layer in the downward direction, the middle layer portion until 2/3, The bottom surface can be defined as the lower layer.

Referring to FIG. 4, when the surface layer of the raw material layer is ignited through the ignition furnace in general, the high temperature is maintained in the upper portion of the raw material layer by ignition heat in the ignition furnace in front of the ignition furnace in the sintering direction. However, there is a transient region with relatively low temperature up to the region where the combustion of solid fuel occurs normally and the high temperature is maintained. This transient region mainly occurs in the upper part of the fuel layer and serves as a factor to lower the quality of the sintered ores produced in the upper layer. The upper layer of the raw material layer is likely to be cooled by the outside air flowing into the sintering vehicle due to the suction force of the wind box, as described in the problems of the related art. Therefore, sintering of the sintered raw material is not performed properly, so that the sintered ores produced in the upper portion of the raw material layer have low strength and low productivity.

Referring to FIG. 5, in the conventional sintering facility, changes in the temperature of the exhaust gas in the wind box and changes in the temperature of the inside of the sintering bogie in the sintering section can be seen. Here, the temperature change inside the sintered bogie was derived based on the change of the exhaust gas temperature in the wind box and the change of the oxygen concentration contained 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 using a detecting unit installed in the windbox, that is, a temperature measuring instrument and an oxygen concentration measuring instrument, and an exhaust gas temperature curve (hereinafter referred to as WTC) Derive oxygen concentration curves.

After ignition in the ignition furnace, combustion of the solid fuel occurs until the combustion zone reaches the bottom of the sintered bogie, so that oxygen is exhausted and the oxygen concentration in the exhaust gas is reduced to maintain a 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 temperature of the exhaust gas is supplied to the drying zone and the desorption zone of the combustion zone under the combustion zone until the combustion zone reaches the bottom of the sintering unit, Or less. When the combustion is completed to the bottom of the sintered bogie, the sensible heat after combustion moves to the bottom due to the suction force of the windbox, the temperature of the exhaust gas rises sharply, and the temperature is kept constant due to the inflow of outside air in the cooling section immediately before the light- And then descends again.

Since the temperature of the exhaust gas and the oxygen concentration in the exhaust gas change with a constant pattern in the sintering section, the temperature distribution inside the sintering vehicle can be predicted using such characteristics.

That is, a point at which combustion is completed from the ignition furnace to the bottom of the sintered bogie after ignition (Burn Contact Poin, hereinafter referred to as "BCP") corresponds to a point where the oxygen concentration in the exhaust gas and the temperature of the exhaust gas start to rise sharply do. The point at which the combustion of the raw material layer is completed physically after the BCP (Burn Infection Point, hereinafter referred to as "BIP") is a point where the oxygen concentration in the exhaust gas becomes equal to the oxygen concentration of the outside air. It corresponds to the inflection point in the curve (WTC). After the BIP in which the raw material layer is completely burned, the exhaust gas temperature rises due to sensible heat after combustion, and a burn through point (hereinafter referred to as "BTP ") appears at which the exhaust gas temperature reaches the maximum. The speed of the sintering truck is controlled so that the BTP position is formed just before the light-directing part, and the section from the post-BTP to the light shining part is a section for cooling the sintered light by the outside air.

By estimating the temperature inside the sintered bogie using the temperature change and the oxygen concentration change of the exhaust gas thus measured, the range of the combustion zone is set at a predetermined temperature, for example, 1200? Or more. That is, in the fuel layer inside the sintered bogie, a line that starts combustion of the coke as the solid fuel after ignition (hereinafter referred to as "FFL") and a line where the combustion of the coke as the solid fuel is completed and starts to cool Frame back line (hereinafter referred to as "FBL") is predicted to define the combustion zone where the coke as the solid fuel is burned to produce the sintered ores.

FFL corresponds to a straight line connecting from the starting point of ignition of the material layer P1 to the position of the BCP. And FBL corresponds to a straight line connecting the BIP at the ignition start point P1 and the height h0 of the red light at the light transmitting section in the sintered cake section. The combustion zone is formed over the area between the upper side of the FFL and the lower side of the FBL, and the sintering reaction in which the ores in the sintering raw material are melted and solidified by the combustion of the coke is generated in this area. As shown in FIG. 5, the combustion zone moves downward along the traveling direction of the sintered bogie, and the width of the combustion zone increases.

5, when the height of the raw material layer in the sintering vehicle (from the bottom of the sintering vehicle to the surface layer of the raw material layer) is denoted by H, the intermediate layer having a depth of 2 / 3H to 1 / The width of the combustion zone is relatively narrow in the upper layer portion having the depth of H to 2 / 3H and the width of the combustion zone is relatively wide in the lower layer portion having the depth of 1/3H to 0H. In this case, the amount of heat required to form the sintered ores is insufficient due to direct inflow of ambient air at the upper part, and heat is continuously introduced from the upper and middle parts of the lower part, resulting in excessive heat. The quality and productivity of the produced sintered ores are lowered. Generally, when the sintered ores are produced, the combustion zone formed in the raw material layer must be maintained for about 150 seconds to obtain high-quality sintered ores. This position corresponds to a position of about 2 / 3H from the surface of the raw material layer.

Therefore, in the embodiment of the present invention, the amount of heat inside the raw material layer is controlled so that the combustion zone formed in the raw material layer can be maintained for about 150 seconds in the entire sintering section. Accordingly, the holding time of the combustion zone can be controlled to be constant over the entire sintering zone by increasing the holding time of the combustion zone by providing heat to the upper layer of the raw material layer where the transient region occurs, and by shortening the holding time of the combustion zone in the lower layer portion of the raw material layer have. Providing the amount of heat to the upper layer of the raw material layer can be performed by supplying oxygen and gaseous fuel to the raw material layer. Also, when the combustion is completed to the lower part of the sintering bogie, humidifying air is supplied into the sintering bogie to accelerate the cooling of the sintered ores, thereby shortening the overheating duration of the lower layer. That is, oxygen and gaseous fuel are supplied to the raw material layer at the initial stage of sintering in which the combustion of the upper layer is performed, so that the raw material layer is sufficiently burned in the upper layer. Also, in the section where the sintered ores are cooled after the sintering is completed, by supplying humidified air to the sintered ore to reduce the amount of heat, the overheating phenomenon of the lower layer can be suppressed.

In the present invention, as shown in FIG. 6, in order to uniformly form the holding time of the combustion zone over the entire sintering section, the combustion zone is enlarged in the zone where the combustion zone is formed in the upper layer of the material layer, The holding time of the combustion zone can be uniformly controlled over the entire sintering section by reducing the combustion zone in the section where the combustion zone is formed.

In the section where the combustion zone is formed in the upper layer of the raw material layer, oxygen and gaseous fuel are supplied to expand the combustion zone, and humidified air is supplied to the zone where the combustion zone is formed in the lower layer of the raw material layer to cool the glow- . At this time, by changing the FBL corresponding to the line where the combustion of the coke as the solid fuel is completed and starting to be cooled, the combustion zone can be uniformly formed over the entire sintering section.

Here, the zone for expanding the combustion zone is divided into two zones: a high temperature zone between FFL and FBL, that is, a zone of 1200 ° or higher, from the surface layer (H) to 2 / 3H of the short material layer, . This position is referred to as a heat exchange point (hereinafter referred to as "HIP") and is a position at which the combustion zone starts to decrease due to the reduction of the solid fuel while the combustion zone is increased by the heat supply. That is, the HIP corresponds to a point at which the most suitable heat quantity can be supplied to produce the sintered ores in the sintered bogie.

 In the section where the combustion zone is formed on the upper layer of the raw material layer, the combustion zone can be expanded by supplying oxygen and gaseous fuel to the upper layer of the raw material to delay the time of completion of the combustion of the coke as the solid fuel. At this time, since there is a risk of ignition of the gaseous fuel by the flame into the ignition, it is preferable that the timing of supplying oxygen is performed at a position spaced from the ignition line by a predetermined distance.

When the surface layer of the raw material layer is ignited, oxygen is supplied to the raw material layer inside the sintered compact, and then the gaseous fuel is supplied to the raw material layer. The reason why the gaseous fuel is supplied after oxygen is supplied is to supply oxygen to the ignited raw material layer to promote the combustion of the solid fuel contained in the raw material layer, thereby facilitating the combustion of the gaseous fuel to be supplied later. That is, the gaseous fuel is supplied to the raw material layer in a state of being diluted to a concentration lower than the concentration of the ambient air. At this time, if the gaseous fuel is not raised to the minimum temperature required for combustion, the gas fuel can be discharged to the unburned state by the suction force of the windbox. Therefore, it is necessary to raise the temperature inside the raw material layer to the minimum temperature at which the gaseous fuel can be burned by supplying oxygen to the raw material layer to accelerate and retard the combustion of the solid raw material. Oxygen can be supplied to a point E1 at which the fuel layer is at the minimum temperature (the lowest combustion temperature) at which the gaseous fuel can be burned, and then the gaseous fuel can be supplied to supply the amount of heat to the upper portion of the raw material layer.

In FIG. 6, an ideal Ideal Frame Back Line (hereinafter referred to as "IFBL") can be formed by connecting HIP to a point E1 at which the fuel layer becomes the minimum temperature at which gaseous fuel can be burned. In comparison between the existing FBL and the combustion zone formed by the IFBL according to the present invention, the region S1 formed on the upper side of the HIP in the region formed by the FBL and the IFBL means the portion to which the heat is supplied, And the area S2 formed in the lower part means a part where the amount of heat is reduced.

If the amount of heat is supplied to the upper layer of the raw material layer, the excessive amount of heat may occur in the middle layer of the raw material layer during the sintering process, and the excessive amount of heat may be further exacerbated in the lower layer. Therefore, it is desirable to reduce the amount of the solid raw material, that is, the coke, in the sintered raw material charged into the sintering vehicle to thereby reduce the amount of heat. At this time, the amount of the solid raw material to be reduced may be similar to or the same as the amount of heat supplied to the upper layer of the raw material layer. When the content of the solid raw material is reduced in the raw material layer, the amount of heat is reduced after the HIP described above.

The BTC, BIP, and BTP positions were determined by deriving the WTC line through the exhaust gas temperature measurement result, and h0, which is the height of the red zone of the sintered ore in the sintered bogie, was measured. Can be derived from Equations (1) to (4). Equation (1) is for deriving the temperature curve (WTC) of exhaust gas, Equation (2) is for deriving FFL in the raw material layer, Equation (3) is for deriving FBL in the raw material layer, 4 is an equation for deriving the IFBL in the raw material layer.

In the above Equations 1 to 4, P, n, S and C are operating fluctuation indices determined by the structure of the sintering machine and the operating conditions, and the exhaust gas temperature distribution (T (x)) along the longitudinal direction (x) Is a constant that can be expressed as P has a value of BTP temperature determination coefficient of 15000 to 1800), n has a value of 3.5 to 5 as a BIP positioning coefficient, S has a value of 38 to 45 as a BIP positioning coefficient, C has a value of 1 Means the exhaust gas temperature of the wind box (?).

When the installation positions of the oxygen supply device 110, the gaseous fuel supply device 120 and the humidifying air supply device 130 are determined in the above-described manner, the oxygen supply device 110, (120) and a gas air supply unit are installed, respectively, and sintering is performed while supplying oxygen, gaseous fuel, and humidifying air according to process conditions.

Hereinafter, an effect obtained by controlling the amount of heat in the raw material layer during the sintering operation will be described.

FIG. 8 is a graph showing the temperature distribution at the sintering side of the sintered body according to the supply of gaseous fuel in the sintering section, and FIG. 9 is a graph showing the temperature distribution FIG. 10 is a graph showing a change in temperature of a sintered bogie according to oxygen concentration in a sintering section of the sintering plant according to an embodiment of the present invention. And FIG. 11 is a graph showing a temperature change inside the raw material layer according to the supply of gaseous fuel in the sintering section of the sintering plant according to the embodiment of the present invention.

First, FIG. 7 shows the effect of supplying oxygen to the raw material layer during the sintering process. In order to confirm the effect obtained by supplying oxygen to the raw material layer during the sintering process, The result of measuring the combustion zone temperature change is shown. At this time, since the outside air, that is, the air contains about 21% of oxygen, the oxygen concentration of the outside air is described as 21%. When the oxygen concentration was increased to 30%, the change of the combustion zone temperature in the raw material layer was measured.

According to Fig. 7, in the case where only the outside air is sucked, the maximum temperature is 1200? However, when the oxygen concentration is increased to 30%, the combustion zone temperature in the raw material layer is 1200? Or more. It can also be seen that the rise point of the combustion zone temperature rises faster than the case where only the outside air is sucked. When oxygen is supplied to the raw material layer during the sintering process, it can be seen that the solid fuel in the raw material for sinter is burned faster and the temperature of the combustion zone can be raised to a high temperature, that is, a temperature at which the sintered light is smoothly produced. Therefore, by supplying oxygen to the upper portion of the combustion zone, which is low in the thickness and temperature of the combustion zone during the sintering process, in particular, immediately after ignition, the combustion zone can be expanded to smooth the combustion of the gaseous fuel to be supplied later.

In order to examine the effect obtained by supplying the gaseous fuel, the temperature distribution on the sintering side of the sintering vessel and the internal temperature of the raw material layer in the case of performing only the sintering process by sucking only the air outside and performing the sintering process while supplying the gaseous fuel The results of measuring the temperature change are shown in Figs. 8 to 11. Fig.

Fig. 8 shows the temperature distribution on the side of the sintered bogie, and Figs. 9 (a) and 9 (b) show the temperature distribution of the raw material layer in the widthwise direction of the sintered bogie and in the sintering direction in 1/4.

Referring to FIG. 8, the area between the surface layer in which combustion is initiated by ignition and the middle layer portion where normal combustion occurs is measured in a transient state at a low temperature before injecting gaseous fuel.

9 (a) and 9 (b), the temperature of the raw material layer measured at the central portion, which is a half of the width of the sintered bogie in the width direction, and the side portion at a quarter of the width direction of the sintered bogie, As a result of measuring the temperature at the depth of 150 mm and the depth of 200 mm from the surface layer of the layer, it can be seen that the temperature of the side portion is low and the side portion is formed at the rear end, In other words, it can be seen that the internal temperature of the sintered bog is significantly varied in the width direction and the traveling direction of the sintered bogie. This is because the temperature difference in the width direction of the sintered bogie is different from that in the sidewall of the sintered bogie because the suction force of the wind box acts on the sidewalls of the sintered bogie differently from each other. Which adversely affects the combustion of solid fuel.

On the other hand, when the gaseous fuel is supplied as shown in FIG. 10, it can be seen that the temperature of the side surface of the sintered bogie is higher than that of FIG. 8 after the surface layer is ignited in the ignition furnace. It can also be seen that the temperature of the surface layer of the raw material layer ignited in the ignition furnace is also widened toward the direction of advancement of the sintering bogie and the lower direction of the sintering bogie.

11 (a) and 11 (b) show the temperature distribution of the upper layer of the raw material layer depending on the flow rate of the gaseous fuel, Fig. 11 (a) Is supplied.

Comparing FIG. 8 with FIG. 11, it can be seen that 1200? It can be seen that the time for maintaining the high temperature region is increased. 11 (a) and 11 (b), as the flow rate of the gaseous fuel supplied increases, And the temperature of the upper layer of the raw material layer is continuously maintained.

Thus, the quality and productivity of the sintered ores produced in the upper layer can be improved by enlarging the area of the combustion zone in which the sintering reaction is normally performed in the upper layer of the raw material layer by the supply of the gaseous fuel. Further, the temperature deviation of the raw material layer generated in the traveling direction and the downward direction of the sintered bogie can be reduced by supplying and regulating the flow rate of the gaseous fuel. Therefore, by supplying oxygen and gaseous fuel during the sintering process, it is possible to smoothly sinter the sintering raw material in the upper layer by supplying heat to the upper portion of the raw material layer at the initial stage of sintering, and by controlling the flow rate of the gaseous fuel supplied in the width direction of the sintering bogie, It is possible to control the temperature deviation of the raw material layer occurring in the width direction of the carriage.

In addition, although not shown in the drawing, the cooling of the sintered light is promoted by supplying humidified air to the sintered light before the sintered light is distributed through the light distribution portion, thereby suppressing the degradation of the quality of the sintered light due to the excessive heat.

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

12 is a flowchart sequentially illustrating a process of manufacturing sintered ores by the method of manufacturing sintered ores according to an embodiment of the present invention.

A method of manufacturing an sintered ore according to an embodiment of the present invention includes a step (S110) of preparing a raw material for sintering (S110), a step (S112) of forming a raw material layer by charging a raw material for sinter into a sintering vehicle, A step S116 of supplying oxygen to the raw material layer, a step S118 of supplying gaseous fuel to the raw material layer, a step of supplying gaseous fuel to the raw material layer, (S120) and a process of distributing the sintered ores (S122).

The upper light is supplied to the upper light hopper 10, and a raw material for sintering is prepared by supplying the sintered raw material including iron ore and solid raw material to the waste hopper 20. At this time, the content of the solid raw material can be reduced by about 50 to 60% by weight in comparison with the content of the solid raw material in preparing the raw material for sinter. Generally, when the content of the solid raw material is about 9% by weight based on the total weight of the raw materials for sinter, it can be reduced to about 3.5 to 4.5% by weight and the content of iron ore can be increased. By reducing the content of the solid raw material as described above, it is possible to suppress the excessive heat phenomenon in the middle and lower portions of the raw material layer, which may occur when oxygen and gaseous fuel are supplied to the raw material layer during the sintering process. In addition, the emission of pollutants such as carbon monoxide can be reduced and the occurrence of environmental pollution can be reduced.

Thereafter, a plurality of sintering carts 50 are sequentially passed to the lower side of the upper light hopper 10 and the surge hopper 20, and the upper light and the sintering material are charged into each of the plurality of sintering carts 50 to form a raw material layer. Each of the plurality of sintering trucks 50 is sequentially passed under the ignition furnace 30 and a flame is ignited on the surface layer of the raw material layer and each sintering truck 50 is transported by the transporting device 40 in the direction of the light- At this time, the sintering carts 50 sequentially pass over the upper side of the plurality of windboxes 70 arranged in the sintering section.

When the flame is ignited on the surface layer of the raw material layer, oxygen is supplied to the raw material layer through the oxygen supply device 110. At this time, oxygen is preferably mixed with the outside air in the first hood 114 of the oxygen supplying device 110 to have a concentration of about 21 to 30%. If the oxygen concentration is lower than the suggested range, The temperature can not be raised, and even if the oxygen concentration is higher than the suggested range, there is a limit to raising the temperature of the raw material layer. When oxygen is supplied to the raw material layer, the flame of the surface layer moves to the lower side of the sintering drum 50 by the suction force of the wind box 70, and the solid fuel in the raw material layer is burned. Thus, the temperature inside the raw material layer rises to the lowest combustion temperature of the gaseous fuel to be supplied subsequently.

Thereafter, oxygen supply to the raw material layer is stopped and gaseous fuel is supplied. At this time, it is preferable to secure the time for the solid fuel to be sufficiently burned by the oxygen supply without supplying the gaseous fuel continuously after the stop of the oxygen supply. The gaseous fuel is supplied to the second hood 124 through the second nozzle 126 and mixed with the outside air flowing into the through hole 123 formed in the upper surface of the second hood 124, To about 3% by volume or less. The gaseous fuel moves to the interior of the raw material layer by the suction force of the wind box and can be burnt after reaching the combustion zone formed inside the raw material layer.

The supply of gaseous fuel can be intermittently supplied through the second hood 124 spaced apart within the sintering section. Since the gaseous fuel and the outside air can be supplied repeatedly, it is possible to suppress the oxygen deficiency phenomenon that may occur as the solid fuel is burned together with the combustion of the gaseous fuel, thereby preventing the gaseous fuel from being discharged through the wind box without burning .

In addition, when the gaseous fuel is supplied, the flow rate of the gaseous fuel can be controlled through the second hood 124, which is divided in the width direction of the sintered bogie, so that the temperature deviation in the width direction of the sintered bogie can be suppressed.

Next, the supply of the gaseous fuel is stopped, and the sintered bogie 50 is transferred to the light-shading portion 60, and the raw material layer in the sintered bogie 50 is sintered to produce sintered light.

When the sintered ores are formed, humidified air is supplied to the sintered ores through the humidifying air supply unit 130 immediately before the light shading unit 60 to cool the sintered ores. At this time, since the lower layer portion of the sintered ores continues to be in a red state, the sintered ores in the lower layer may be over-sintered, so that humidified air can be supplied to promote cooling of the sintered ores in a red state.

The supply of the humidifying air can be performed from the bottom of the sintering bogie to after the completion of the combustion of the solid raw material to just before the light-directing portion.

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.

10: upper light hopper 20: surge hopper
50: Sintering truck 70: Wind box
100: calorie regulator 110: oxygen supply device
120: a gaseous fuel supply device 130: a humidifying air supply device

Claims (24)

A plurality of sintering carts movable along the movement path and loaded with a raw material layer therein;
An ignition means provided at an upper side of the movement path for spraying a flame on a raw material layer in the sintered bogie;
A light-splitting unit installed on the other side of the movement path and discharging the sintered light that has been sintered;
A wind box provided between the ignition passage and the light-splitting section in the movement path; And
A calorie regulator provided between the ignition passage and the light-splitting section at an upper portion of the movement path, for supplying a heat quantity and humidifying air to the raw material layer;
And a sintering furnace. The method according to claim 1,
Wherein the calorie regulator comprises:
An oxygen supply device for supplying a gas containing oxygen to the raw material layer;
A gaseous fuel supply device provided at one side of the oxygen supply device for supplying gaseous fuel to the raw material layer,
And a humidifying air supply and supply device provided at one side of the gaseous fuel supply device for supplying humidified air to the raw material layer. The method of claim 2,
The oxygen supply device includes:
An oxygen reservoir for storing oxygen,
A first hood which is provided at an upper portion of the movement path so as to surround an upper portion of the sintered bogie,
And a first nozzle for supplying oxygen stored in the oxygen reservoir to the inside of the first hood. The method of claim 3,
The gaseous fuel supply device includes:
A gaseous fuel reservoir for storing gaseous fuel,
A second hood provided at an upper portion of the movement path to surround the upper portion of the sintered bogie and having a through hole formed in an upper surface thereof,
And a second nozzle for supplying oxygen stored in the gaseous fuel reservoir to the inside of the second hood. The method of claim 4,
And the second hood is spaced apart from the first hood. The method according to claim 4 or 5,
Wherein the oxygen supply device, the gaseous fuel supply device, and the humidifying air device are sequentially provided along the moving direction of the sintered bogie. The method of claim 6,
Wherein the gaseous fuel supply device is provided in an area within 1/3 of the movement path between the light shading part in the ignition path, and the oxygen supply device is provided in an area of 1/4 to 1/2 The sinter orbital manufacturing facility provided in the region. The method of claim 4,
The second hood is formed to space-divide a plurality of spaces in the inner space of the second hood along the width direction of the sintered bogie,
And a second nozzle is connected to the separated space of the second hood. The method of claim 8,
A plurality of second hoods are disposed along the moving direction of the sintered bogie,
Wherein the plurality of second hoods are spaced apart from each other. The method of claim 9,
And the length of the second hood is 2 to 4 times longer than the distance between the second hood. The method of claim 2,
The humidifying air supply device includes:
A water reservoir for storing water,
A third hood which is provided at an upper portion of the movement path and surrounds the upper portion of the sintered bogie,
And a third nozzle for supplying the moisture stored in the moisture reservoir to the inside of the third hood. The method of claim 11,
Wherein the humidifying air supply device is provided behind the light shading portion with respect to the moving direction of the sintered bogie. Preparing a raw material for sinter;
Forming a raw material layer by charging the raw material for sinter into a moving sintering vehicle;
Igniting the raw material layer;
Supplying a quantity of heat to the raw material layer;
A step of supplying humidified air to the sintered ores produced by sintering the raw material for sinter to cool the sintered ores; And
And light distribution of the sintered ores. 14. The method of claim 13,
In the process of preparing the raw material for sinter,
Wherein the content of the solid fuel contained in the raw material for sinter is 3.5 to 4.5 wt% with respect to the total weight of the raw material for sinter. 14. The method of claim 13,
The process of supplying the heat may include:
Supplying a gas containing oxygen to the raw material layer;
And supplying gaseous fuel to a raw material layer to which a gas containing oxygen is supplied. 16. The method of claim 15,
The process of supplying oxygen includes:
Wherein the step of igniting the raw material layer is performed after the step of igniting the raw material layer. 18. The method of claim 16,
In the process of supplying oxygen,
Wherein the oxygen is mixed with the outside air and supplied to the raw material layer at a concentration of 21 to 30%. 18. The method of claim 17,
The process for supplying oxygen and the process for supplying gaseous fuel may include:
Wherein the temperature of the exhaust gas generated while burning the raw material for sinter and the oxygen concentration in the exhaust gas are measured and the combustion is performed in a region where combustion progresses to 2/3 height from the surface of the raw material layer. 19. The method of claim 18,
Wherein the step of supplying the oxygen is performed until the temperature of the combustion zone formed in the raw material layer reaches the minimum combustion temperature of the gaseous fuel. The method of claim 19,
Wherein the step of supplying the gaseous fuel is performed so that the concentration of the gaseous fuel becomes lower than the temperature of the combustion zone. The method of claim 20,
Wherein the step of supplying the gaseous fuel alternately and repeatedly supplies the gaseous fuel and the outside air. 23. The method of claim 21,
Wherein a portion for supplying the gaseous fuel in the course of supplying the gaseous fuel is longer than a portion for supplying the outside air. The method according to any one of claims 13 to 22,
Wherein the gaseous fuel is at least one of liquefied natural gas (LNG), coke oven gas, and blast furnace gas. 24. The method of claim 23,
Wherein the process of supplying the humidified air is from the completion of the combustion of the raw material for sinter located at the bottom of the sintered bogie to the just before the distribution of the sintered light.

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