JP2017537290A - Sintering apparatus and sintering method - Google Patents

Abstract

A sintering apparatus according to the present invention is arranged movably along a movement path, and is provided with a plurality of sintering carts into which raw materials are charged, and disposed above the sintering carts. An ignition furnace for injecting a flame onto the upper surface of the sinter, and a plurality of windows disposed along the movement path at a lower part of the sintering carriage, and a window for inhaling air toward the lower part of the sintering carriage to sinter the raw material A box, a cooler disposed on one side of the moving path and supplying a cooler gas to the sintered ore discharged from the sintering cart, and a cooler gas connected to the cooler and supplied to the raw material A first circulation part for supplying at least a part of the material to the upper part of the sintering cart, the combustion process of the raw material can be controlled, the combustion efficiency can be improved, the quality of the raw material and Productivity can be improved. [Selection] Figure

Description

  The present invention relates to a sintering apparatus and a sintering method, and more particularly, a sintering apparatus capable of improving the quality and productivity of a raw material by controlling the combustion process of the raw material or improving the combustion efficiency, and The present invention relates to a sintering method.

  In general, in the sintering process, powdered iron ore, auxiliary raw materials and fuel (powder coke, anthracite), etc. are put in a drum mixer, mixed and conditioned, and then charged into a sintering cart to a predetermined height. . Next, after igniting the surface of the blended raw material using an ignition furnace, the sintered blended raw material is sintered while forcibly sucking air downward. Next, the sinter produced by the sintering is discharged and cooled in a cooler through a crusher. Next, among the sintered ores, the sintered ore having a particle size that is easy to be charged into the blast furnace and easily reacted is conveyed to the blast furnace, and the fine ore that is a sintered ore having a small particle size is classified as a return ore. And reused as a sintering raw material.

  Such a sintering process is performed by forming a negative pressure in a wind box arranged at the lower part of the sintering cart and applying suction to the sintering cart. When the main blower is driven, negative pressure is generated in the wind box. The compounded material loaded on the sintering cart is sintered while air is sucked downward from the ignited surface of the compounded material by the negative pressure of the wind box. The sintered raw material is cooled by a cooler gas sprayed in a cooler through a crusher.

  However, when the blended raw material in the sintering cart is sintered, the heat generated by the combustion is accumulated in the lower portion due to the air sucked from the upper portion to the lower portion of the sintering cart. The temperature of the lower layer is higher. For this reason, there is a possibility that the quality and productivity of the produced raw material are lowered as a result of the sintering reaction not being sufficiently performed on the upper part of the raw material.

  Conventionally, the sintered exhaust gas, which is the air sucked through the wind box, or the cooler gas that has cooled the sintered ore is directly discharged to the outside. Such gas contains components that pollute the environment and passes through high-temperature sintered ore, so it may have a lot of thermal energy. For this reason, if such a gas is discharged to the outside as it is, there is a possibility that environmental pollution will be caused and a great amount of energy may be lost.

The present invention provides a sintering apparatus and a sintering method capable of controlling the combustion process of raw materials.
The present invention provides a sintering apparatus and a sintering method capable of circulating the gas generated during the sintering process.
The present invention provides a sintering apparatus and a sintering method capable of improving the quality and productivity of raw materials.

  A sintering apparatus according to the present invention is arranged movably along a movement path, and is provided with a plurality of sintering carts into which raw materials are charged, and is disposed on an upper portion of the sintering cart. An ignition furnace for injecting flames, a plurality of the furnaces disposed along the moving path at the lower part of the sintering carriage, and a wind box for sucking air toward the lower part of the sintering carriage to sinter the raw material, At least one of a cooler disposed on one side of the moving path and supplying a cooler gas to the sintered ore discharged from the sintering carriage, and a cooler gas connected to the cooler and supplied to the raw material And a first circulation part for supplying the part to the upper part of the sintered carriage.

The sintering apparatus includes a gaseous fuel supply unit that is connected to the first circulation unit and supplies gaseous fuel to the first circulation unit.
The first circulation part is disposed at an upper part of the sintering carriage, and has a first hood extending along the movement path, one end connected to the cooler, and the other end connected to the first hood. A first connection line connected to one hood, and a first blower arranged in the first connection line.

  The sintering apparatus includes a second circulation unit that is connected to a part of the wind box and supplies air sucked into the part of the wind box to an upper part of the sintering cart, and the moving path. Has a charging section in which the raw material is charged into the sintering cart, an ignition section in which the ignition furnace ignites the raw material, and a sintering section in which the raw material is sintered, The first circulation section and the second circulation section supply the sucked air or cooler gas to the sintering section.

  The second circulation part is connected to a part of the wind box, and is disposed at an upper portion of the sintering carriage, and is formed along a suction path that forms a space in which air is accommodated. A second hood that is extended to the second hood, a second connection line that has one end connected to the suction pipe and the other end connected to the second hood, and the second connection line. And a second blower provided.

  The first hood disposed in the first circulation unit is disposed between the ignition furnace and the second hood, and the first hood is disposed at a point before 1/2 of the moving path. Located at the top of the placed windbox.

One end of the second hood is arranged between the upper part of the wind box arranged from the point after the end of combustion of the raw material to the end with respect to the moving path.
The extended length of the second hood is equal to or greater than the number of window boxes connected to the suction pipe × the length of one window box.

The suction pipe is connected to a wind box arranged between a half point of the moving path and a point where the temperature of the sucked air becomes maximum.
The movement path has a charging section in which the raw material is charged into the sintering carriage, an ignition section in which the raw material is ignited, and a sintering section in which the raw material is sintered, The first circulation unit and the gaseous fuel supply unit supply the cooler gas and the gaseous fuel to the sintering section.

  The gaseous fuel supply unit includes a connection supply line that forms a path through which the gaseous fuel moves, and the connection supply line is connected to a first connection line disposed in the first circulation unit. The

The gaseous fuel supply unit forms a path through which gaseous fuel moves, and has one end connected to the first hood of the first circulation unit, and one of the fuel supply lines And an injector provided at an end for injecting the gaseous fuel onto an upper portion of the sintering cart.
The gaseous fuel is supplied after being diluted below the lower limit concentration of combustion.

  The method for producing a sintered ore according to the present invention is a method for producing a sintered ore, a process of charging a raw material into a sintered carriage moving along a moving path, and a process of igniting the raw material A process of sucking air in a lower direction of the raw material, a process of discharging sintered sinter, supplying a cooler gas to the sinter, and a cooling gas supplied to the sinter A step of supplying at least a part of the raw material to the raw material in the sintering cart, and in the step of supplying the cooler gas to the raw material, a wind box disposed before a half point of the moving path The cooler gas is supplied to the upper part of the air.

  The process of supplying the cooler gas to the raw material in the sintering cart includes the process of measuring the temperature of the cooler gas, and supplying the cooler gas to the raw material if the temperature of the cooler gas is equal to or higher than a set temperature. Process.

The sintering method includes a process in which the cooler gas is supplied to the raw material in the sintering carriage and then the gaseous fuel is mixed and supplied to the cooler gas.
The sintering method includes a process in which air is sucked in a lower direction of the raw material and then a part of the sucked air is supplied to the raw material in the sintering cart.

In the process of supplying a part of the sucked air to the raw material in the sintering cart, it is between the half point of the moving path and the point where the temperature of the sucked air becomes maximum. Inhale air in the area.
In the process of mixing the gaseous fuel, the gaseous fuel is supplied before the start of the supply of the cooler gas, simultaneously with the supply of the cooler gas, or after the supply of the cooler gas is started.

  In the process of mixing and supplying gaseous fuel to the cooler gas, the cooler gas and gas are placed on the upper part of the sintering carriage that moves from the point where the raw material is ignited to half the moving path. Supply fuel.

  According to the embodiment of the present invention, a high-temperature cooler gas and gaseous fuel can be supplied to the upper part of the raw material to control the combustion process of the raw material. Gaseous fuel can extend the time the raw material is burned. For this reason, the temperature of a raw material can be raised easily and the time for which a raw material maintains a high temperature state can be extended. Therefore, the quality of the raw material to be produced is improved, and the amount of raw material that can be used is increased compared with the raw material that has been input, and the productivity is improved.

  Further, the sintering exhaust gas generated during the sintering process and the cooler gas generated while cooling the sintered ore can be circulated to the upper part of the sintering carriage to be used for sintering. If such exhaust gas is supplied to the raw material in the process of sintering the raw material, the combustion efficiency can be improved, and the upper part of the sintered layer can be suppressed or prevented from being cooled by external air.

Therefore, the amount of sintered ore that can be used is increased compared with the raw material that is input, and the productivity is improved.
Furthermore, although the air volume inside the sintering cart may decrease while sintering is performed, the quality of the sintered ore produced by increasing the air volume in the portion where the air volume decreases can be improved.

It is a figure which shows the sintering apparatus by embodiment of this invention. It is a figure which shows the cross-sectional shape of the sintering layer in the sintering process of the raw material by embodiment of this invention, and the characteristic of waste gas. It is a figure which shows the sintering apparatus by other embodiment of this invention. It is a figure which shows the sintering apparatus by other embodiment of this invention. 3 is a flowchart illustrating a sintering method according to an embodiment of the present invention. It is a figure which shows the pot experiment apparatus by embodiment of this invention. It is a graph which shows the change of the temperature in the sintered layer by embodiment of this invention.

Hereinafter, a “sintering apparatus and sintering method” according to an embodiment 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 disclosed below, but may be embodied in various different forms, which merely complete the disclosure of the present invention and It is provided in order to fully inform the person skilled in the art of the scope of the invention. The drawings may be exaggerated for the purpose of illustrating the invention in detail, wherein like reference numerals refer to like elements.

  FIG. 1 is a diagram illustrating a sintering apparatus according to an embodiment of the present invention, and FIG. 2 is a diagram illustrating a cross-sectional shape of a sintered layer and characteristics of exhaust gas during a raw material sintering process according to an embodiment of the present invention. is there.

  As shown in FIG. 1, a sintering apparatus 100 according to an embodiment of the present invention includes a plurality of sintering carts 130 that are movably disposed along a moving path and in which raw materials are charged, and the sintering carts. And an ignition furnace 110 for injecting a flame onto the upper surface of the raw material, and a plurality of lower portions of the sintering cart 130 along the moving path, and in a lower direction of the sintering cart 130. A wind box 140 that sucks air to sinter the raw material, a cooler 172 that is disposed on one side of the moving path and supplies a cooler gas to the sintered ore discharged from the sintering carriage 130; A first circulation unit 180 connected to the cooler 172 and supplying at least a part of the cooler gas supplied to the raw material to the upper part of the sintering cart 130. The sintering apparatus may further include a charging unit 120, a pulverizing unit 171, a discharging unit 190, and a second circulation unit 150.

At this time, the cooler gas supplied to the sintered ore to cool the sintered ore may be cooler exhaust gas.
Here, the sintered carriage 130 may be arranged so as to rotate by an endless track system, and may form a closed loop to form an upper movement path and a lower transmission path. In the movement route, the raw material is charged into the sintering cart 140 to sinter the raw material, and in the transfer route, the empty sintering cart 130 from which the sintered sinter has been discharged is moved. It is sent to the upper moving path for the sintering process.

  The movement path may extend in the longitudinal direction, and the sintering cart 130 may move from the front to the rear of the movement path. In addition, the movement path is located in the forefront of the movement path, the charging section in which the charging section is disposed, the ignition section in which the ignition furnace 110 is disposed in the subsequent stage of the charging section, And a sintering section that is positioned after the ignition section and in which the raw material is sintered. That is, the charging section is a section in which the raw material is charged or supplied to the sintering cart 130, the ignition section is a section in which the raw material is ignited, and the sintering section is ignited on the upper surface of the raw material. This is a section in which the fired flame is moved to the lower part to sinter the raw material.

  The sintering cart 130 may form a space in which the raw material is accommodated therein, and a plurality of the sintering carts 130 may be provided in an endless track in one direction to move along the moving route and the forwarding route. For this reason, the sintering cart 130 may be sintered and discharged or discharged after the raw material is charged therein while moving along the moving path and the forwarding path.

  The charging unit 120 is arranged in a charging section in the movement route. That is, the charging section may have a region having a length equal to the length of the charging portion 120 in the longitudinal direction. The charging unit 120 may be provided at an upper portion of the sintering carriage 130, and may include a hopper that forms a space for storing the raw material therein, a charging path that forms a moving path for the raw material, and has an inclined surface. . For this reason, when the raw material is discharged from the hopper to the lower part, the raw material is guided to the inside of the sintering cart 130 via the lower charging chute.

  The ignition furnace 110 is disposed in the ignition section of the movement path. In other words, the ignition section may have a region having a length equal to the length of the ignition furnace 110 in the longitudinal direction. The ignition furnace 110 is disposed at the upper part of the sintering cart 130 and at the rear of the charging unit 120 and supplies a flame to the upper surface of the raw material in the sintering cart 130 to ignite it.

  A plurality of the wind boxes 140 are arranged below the sintering cart 130 along the movement path. More specifically, the wind box 140 may be disposed between the ignition furnace 110 and a section where the raw material is discharged from the sintering cart 130. The wind box 140 sucks air from the lower direction of the sintering cart 130. For this reason, the air above the sintering carriage 130 passes through the raw material inside the sintering carriage 130 and is sucked into the lower wind box 140. Therefore, the flame ignited on the upper surface of the raw material in the sintering cart 130 moves to the lower surface of the raw material by the air sucked in by the wind box 140 and the raw material is sintered. However, the section in which the wind box 140 is disposed is not limited to this and can be variously changed.

  The discharge unit 190 is connected to the plurality of window boxes 140 to provide suction input to the window boxes 140 and to discharge the sucked air to the outside. The discharge unit 190 is connected to the lower part of the plurality of wind boxes 140, and includes a suction chamber 191 that forms a movable space in which air is contained therein, a dust collector 192 disposed in the suction chamber 191, and air moving The main blower 193 disposed behind the dust collector 192 with respect to the path to be used, and the chimney 194 disposed behind the main blower 193 are provided.

  Therefore, when the main blower 193 generates a suction input, air is sucked from the upper side to the lower side through the window box 140, and the sucked air moves toward the main blower 193 along the suction chamber 191. Then, after passing through the dust collector 192 and being filtered, it is discharged to the chimney 194 through the main blower 193. That is, when the main blower 193 creates a negative pressure inside the wind box 140, the air above the sintering cart 130 can be sucked. At this time, the air can move from the front to the rear in the suction chamber 191.

  The crushing part 171 may be arranged on one side of the movement path, that is, at a location separated from the rearmost part of the movement path. For this reason, when the massive sintered ore discharged after the sintering is supplied to the crushing portion 171, it is crushed by the crushing portion 171.

  The cooler 172 is arranged separately from the crushing part 171. The cooler 172 is formed so as to have a space in which a raw material, that is, a sintered ore is accommodated. For this reason, when the sintered ore crushed in the crushing part 171 is supplied to the cooler 172, cooler gas can be supplied to internal space via cooler gas injectors, such as a nozzle. Therefore, the heat energy of the sintered ore can be absorbed while the cooler gas is in contact with and passes through the sintered ore. Sintered ore is selected to an appropriate size through these processes and charged into a blast furnace (not shown), and sintered ore with a small particle size is classified as return ore and reused as a sintering raw material. Is done.

  However, the sintered exhaust gas, which is the air sucked through the wind box 140, has thermal energy while passing through the sintered layer, and the cooler gas that has passed through the sintered ore has an environment including dust. It contains contaminating ingredients and can have a lot of thermal energy while passing through hot raw materials. For this reason, when such a gas is discharged outside, there is a risk of causing environmental pollution, and a great amount of energy may be lost. Therefore, the first circulation unit 150 and the second circulation unit 180 according to the embodiment of the present invention may be provided, and air or cooler gas may be supplied to the sintering section to circulate.

  The first circulation unit 180 is connected to the cooler 172 and sucks at least a part of the cooler gas generated in the cooler 172 and supplies it to the upper portion of the sintered carriage 130. The first circulation unit 180 is disposed at the upper part of the sintering carriage 130, and has a first hood 183 extending along the movement path, one end connected to the cooler 172, and the other end. A first connecting pipe 181 connected to the first hood 183; and a first blower 182 disposed in the first connecting pipe 181. Moreover, the 1st circulation part 180 may be provided with the temperature measuring device (not shown) and the controller (not shown).

  The first hood 183 is disposed on the upper portion of the sintering cart 130. The 1st food | hood 183 may be arrange | positioned before 1/2 point on the basis of a movement path | route. That is, the first hood 183 may be disposed between the ignition furnace 110 and a second hood 154 described later. Further, the first hood 183 may be formed so as to extend in the longitudinal direction and become wider as it progresses from the upper part to the lower part. For this reason, cooler gas and gaseous fuel can be supplied to the upper part of the sintering cart 130 which moves between the starting point of the sintering section and a half point of the moving path.

  The cooler gas supplied from the cooler 172 to the raw material absorbs the thermal energy of the high-temperature raw material and rises in temperature, and contains dust generated from the raw material. As shown in FIG. 2, in the section between the ignition furnace 110 and the half point, the combustion zone is located above the sintered layer of the raw material. For this reason, if the high temperature cooler gas which cooled the raw material and absorbed the heat energy is supplied to the upper part of the raw material in the section between the ignition furnace 110 and the 1/2 point through the first hood 183, the cooler gas The thermal energy is supplied to the raw material while passing through the raw material, so that the raw material is more easily combusted, and it is possible to prevent or inhibit the temperature of the raw material from decreasing while the high-temperature cooler gas is supplied.

  In addition, energy can be saved by reusing the cooler gas that has absorbed thermal energy. In order to discharge the cooler gas to the outside, it is necessary to remove dust in the cooler gas. However, by supplying the cooler gas containing dust to the raw material in the sintering carriage 130, the dust can be reused as the raw material, and it is necessary to perform a separate operation for removing the dust in the cooler gas. This eliminates the need for equipment and simplifies the work efficiency.

  The first connecting pipe 181 has one end connected to the cooler 172 and the other end connected to the first hood 183. The first connecting pipe 181 forms a path through which the cooler gas moves. Therefore, at least a part of the cooler gas supplied from the cooler 172 to the raw material is sucked from one end of the first connecting pipe 181, and such cooler gas is supplied to the first hood 183. It can be discharged toward the lower raw material.

  The first blower 182 is disposed in the first connecting pipe 181, that is, the moving path of the cooler gas. The first blower 182 serves to provide a suction input to one end of the first connecting pipe. For this reason, when the cooler 172 supplies cooler gas and the first blower 182 provides suction to the first connecting pipe 181, the cooler gas supplied from the cooler 172 absorbs thermal energy while passing through the raw material. Then, after it becomes cooler gas, it can be sucked into one end of the first connecting pipe 181 and prevented from flowing out of the cooler 172.

  The temperature measuring device is disposed in the first connecting pipe 181 and plays a role of measuring the temperature of the cooler gas that moves through the first connecting pipe 181. A wide variety of sensors capable of measuring temperature can be used as the temperature measuring device.

  The controller is connected to the temperature measuring device and the first blower 182 to control the operation of the first blower 182. The reason why the cooler gas sucked in the first connecting pipe 181 is supplied to the raw material between the ignition furnace 110 and the half point is to promote combustion in the raw material. In order to promote combustion in the raw material, the cooler gas must be hot. If the temperature of the cooler gas is too low, there is a possibility that the heat energy of the raw material is taken away and combustion is hindered.

  Therefore, the operation of the first blower 182 may be controlled by measuring the temperature of the cooler gas passing through the first connecting pipe 181 using a temperature measuring device. For example, when the temperature of the cooler gas measured by the temperature measuring device is less than 100 ° C., the controller interrupts the operation of the first blower 182 and the cooler gas is supplied to the first hood 183. It may be interrupted. On the other hand, the controller may operate the first blower 182 to supply the cooler gas to the first hood 183 when the temperature of the cooler gas measured by the temperature measuring device is 100 ° C. or higher. .

For this reason, only the high-temperature cooler gas can be supplied to the raw material whose combustion zone is located above the sintered layer, and combustion in the raw material can be promoted via the high-temperature cooler gas.
Meanwhile, the sintering apparatus according to the embodiment of the present invention may further include a second circulation unit 150. The second circulation unit 150 is connected to a part of the plurality of wind boxes 140 and serves to supply the sucked air to the upper portion of the sintering cart 130.

  The second circulation unit 150 is connected to the wind box 140 and is disposed on the upper portion of the suction carriage 151 that forms a space in which air is accommodated and the sintering carriage 130, and extends along the movement path. A second hood 154 provided; one end connected to the suction pipe 151; a second connection line 153 connected to the second hood 154 at the other end; and the second connection line. And a second blower 152 disposed at 153. At this time, the sucked air may be air that has passed through the sintered layer in the sintering cart 130 (hereinafter referred to as “inhaled air”).

  The suction pipe 151 forms a space in which air is accommodated and is connected to a part of the plurality of window boxes 140. For example, the suction pipe 151 is connected to a wind box 140 disposed between a half point on the moving route and a point where the temperature of the sucked air is maximum (hereinafter referred to as “BTP”). May be. That is, the air sucked in the region may be circulated.

Since each wind box 140 is provided with a sensor for measuring the temperature of the sucked air, the temperature of the air sucked into the plurality of window boxes 140 can be monitored to confirm the position of the BTP. it can. Although the position of such BTP varies depending on the sintering conditions, the operator can adjust the position of the BTP according to a predetermined window box 140 while adjusting the sintering conditions.

  As shown in FIG. 2, the air volume is affected by the airflow resistance of the sintered layer, but the airflow resistance varies depending on the thickness of the sintered layer, the combustion zone, and the unsintered layer. As the thickness of the combustion zone with a large ventilation resistance increases, the air volume gradually decreases, shows a tendency to decrease to the minimum amount in the intermediate region between the 1/2 point of the moving path and the BTP, and then increase again. .

  In places where the ventilation resistance is large, the amount of air passing through the raw material may be reduced by the wind box 140 and sintering may not be performed smoothly. For this reason, when the wind box 140 disposed between the ½ point of the movement route (hereinafter referred to as “½ point”) and the BTP is connected to the suction pipe 151, the second box described later. Since the blower 152 provides suction input to only some of the wind boxes 140, the suction input is larger than when one of the main blowers 193 provides suction input to all the window boxes 140. Can be offered.

  That is, since the number of the wind boxes 140 connected to the second blower 152 is small, the suction input is not divided well, and as a result, the suction input of each wind box connected to the second blower 152 is increased.

  For this reason, even if the ventilation resistance in the combustion zone between the 1/2 point and the BTP is large, the suction input provided from the second blower 152 is large. Further, it is possible to suppress the reduction of the air volume in the sintering cart 130 as much as possible. That is, although there is a possibility that the movement of air may be hindered due to the airflow resistance of the raw material in the sintering cart 130, the suction force for sucking air from the lower portion increases and the air volume reduced by the airflow resistance is increased. Can do. Therefore, the raw materials are smoothly sintered, and the productivity and quality of the sintered raw materials, that is, sintered ore, are improved.

  On the other hand, when the wind box arranged between the half point and the BTP is connected to the suction pipe 151, the remaining wind boxes except the wind box between the half point and the BTP are sucked. It is connected to the chamber 191. However, the area of the wind box 140 connected to the suction pipe 151 is not limited to this and can be variously changed.

The second hood 154 is arranged on the upper portion of the sintering carriage 130 and plays a role of supplying air sucked into the suction pipe 151 to the raw material. The second hood 154 may be arranged behind the wind box connected to the suction pipe 151 with respect to the movement path. That is, one end of the second hood 154 may be arranged between the upper part of the wind box arranged from the BRP (Burn Rising Point) to the end. The second hood 154 may be formed so as to extend in the longitudinal direction and become wider as it goes from the upper part to the lower part.
For example, the length in which the second hood 154 is extended may be equal to or more than the number of the wind boxes 140 connected to the suction pipe 151 × the length in the longitudinal direction of one window box 140. The air sucked through the suction pipe 151 absorbs the thermal energy of the sintered layer and has a high temperature, and therefore may have a volume larger than that of air at a normal external temperature. Accordingly, since the volume of air that can be sucked by the wind box 140 is limited, if the area where the second hood 154 supplies air or the number of the wind boxes 140 covered by the second hood 154 decreases, There is a possibility that the air discharged from the hood 154 is not completely inhaled into the lower wind box, and part of the air is discharged to the outside, causing environmental pollution.

  When the extended length of the second hood 154 is increased, the number of window boxes 140 disposed on the lower side increases, and therefore the air discharged from the second hood 154 is allowed to flow into the lower window box 140. It is possible to prevent the air discharged from the second hood 154 from flowing out to the outside by being sufficiently inhaled. For this reason, the extended length of the second hood 154 must be formed so as to cover the upper portion of the wind box 140 equal to or more than the number of the wind boxes 140 connected to the suction pipe 151.

  That is, the length of the upper second hood 154 must be formed to cover the number of wind boxes 140 that can sufficiently suck the air discharged from the second hood 154. However, the arrangement position and the extended length of the second hood 154 are not limited to this, and can be variously changed. For example, the region where the other end of the second hood 154 is disposed and the region where the wind box connected to the suction pipe 151 is disposed may partially overlap. In other words, the wind box connected to the suction pipe 151 and a part of the wind box arranged below the second hood 154 may overlap each other.

  On the other hand, the second hood 154 may supply air to a wind box arranged from the BRP to the end with reference to the movement route. That is, as shown in FIG. 2, the air sucked in the wind box 140 between the ½ point and the BTP contains moisture, and the oxygen concentration is lower than that of the outside air. If fresh air is supplied to the raw material in the section where combustion occurs, there is a possibility that combustion will be hindered. For this reason, the raw material behind the movement path where the combustion is almost or completely completed, for example, the raw material in the upper part of the wind box 140 arranged from the BRP to the end is sucked between the 1/2 point and the BTP. Air may be supplied.

However, the position of the second hood 154 and the area and shape for supplying air are not limited to this, and can be variously changed.
The second connection line 153 has one end connected to the suction pipe 151 and the other end connected to the second hood 154. Further, the second connection line 153 forms a path through which air that has flowed into the suction pipe 151 moves. For this reason, the air that has flowed into the suction pipe 151 may be supplied to the second hood 154 via the second connection line 153 and discharged toward the lower raw material.

  The second blower 152 is disposed in the second connection line 153 and provides a suction input capable of sucking air to the window box 140 connected to the suction pipe 151. The second blower 152 has a smaller number of window boxes 140 that provide suction input than the main blower 193. For this reason, even if the suction input provided by the second blower 152 and the main blower 193 is the same, the suction input of the wind box provided with the suction input from the second blower 152 is the first. It may be greater than the suction input of the windbox provided with suction input to the main blower 193 divided more than the two blowers 152.

  Therefore, even if the air permeability inside the sintered carriage 130 above the wind box 140 connected to the second blower 152 is low, the wind box connected to the second blower 152 is connected to the main blower 193. Therefore, it is possible to increase the air volume inside the sintering cart 130 connected to the second blower 152 by providing a suction force larger than that of the wind box.

  That is, since air is sucked with a larger suction force at a place where air permeability is low, the air volume is increased and the quality of the sintered ore produced is improved. However, the magnitude of the suction input of the second blower 152 and the method for improving the suction input are not limited to this, and can be variously changed.

  Thus, the air generated during the sintering process, that is, the cooler gas generated while cooling the sintered exhaust gas and the sintered ore, that is, the cooler exhaust gas, is circulated to the upper portion of the sintering carriage 130 for sintering. Therefore, the exhaust gas is not directly discharged to the outside, and as a result, environmental pollution can be prevented. In addition, since such exhaust gas has a great amount of thermal energy while passing through the raw material, if the exhaust gas is supplied to the raw material in the process of sintering the raw material, the combustion efficiency is improved. Therefore, the amount of sintered ore that can be used is increased compared with the raw material that is input, and the productivity is improved.

FIG. 3 is a view showing a sintering apparatus according to another embodiment of the present invention. Hereinafter, a sintering apparatus according to another embodiment of the present invention will be described.
When the raw material in the sintering cart 130 is sintered, the upper layer comes into contact with the outside and heat energy is taken away by the external air, so that the temperature is less likely to rise than the lower layer, even if the temperature is raised. However, there is a possibility that the maintenance time of the high temperature state is short. For this reason, since there is a possibility that the sintering reaction is not sufficiently performed on the upper part of the raw material, there is a possibility that the quality and productivity of the raw material to be generated are lowered.

  Accordingly, a sintering apparatus according to another embodiment of the present invention further includes a gaseous fuel supply unit 160 in addition to the first circulation unit 180 according to the embodiment of the present invention, and moves the sintering section. High temperature cooler gas and gaseous fuel may be supplied to the upper part of 130. At this time, the sintering apparatus according to another embodiment of the present invention may further include a second circulation unit 150 according to the embodiment of the present invention.

  As shown in FIG. 3, the gaseous fuel supply unit 160 is connected to the first circulation unit 180 and serves to supply the gaseous fuel to the upper portion of the sintering carriage 130 after being mixed with the cooler gas. . The gaseous fuel supply unit 160 includes a fuel supply line 161 that forms a path through which the gaseous fuel is moved, is connected to the first connection pipe 181, and may include a control valve 162.

  The fuel supply line 161 forms a path through which the gaseous fuel moves, and one end thereof communicates with the first connecting pipe 181. For this reason, the gaseous fuel that moves in the fuel supply line 161 flows into the first connecting pipe 181, joins and is mixed with the cooler gas that moves in the first connecting pipe 181. The mixed gaseous fuel and cooler gas move along the first connecting pipe 181 and are supplied onto the sintering cart 130 via the first hood 183.

  The control valve 162 may be disposed in the fuel supply line 161 to control the movement of the gaseous fuel. For this reason, when the operation of the control valve 162 is controlled, it is possible to adjust the amount of gaseous fuel supplied onto the sintering carriage 130 and the point in time when the gaseous fuel is supplied.

At this time, as the gaseous fuel, liquefied natural gas (LNG), liquefied petroleum gas (LPG), coke oven gas (COG), blast furnace gas (BFG), carbon monoxide (CO), At least one of hydrogen (H ₂ ) can be used. Such gaseous fuel may be supplied to the raw material in the sintering cart 130 to control the combustion process of the raw material. That is, the time during which the raw material is burned by the gaseous fuel supplied to the upper part of the raw material is extended. Accordingly, the temperature of the raw material can be easily raised by extending the combustion time, and the time for keeping the raw material at a high temperature is extended. However, the present invention is not limited to this, and various gaseous fuels having flammability can be used.

  Further, the gaseous fuel may be supplied after being diluted below the lower limit concentration of combustion. That is, the gaseous fuel must be burned after being supplied onto the sintering carriage 130 to facilitate the sintering of the raw material. However, if the gaseous fuel is combined with the high-temperature cooler gas in the first connecting pipe 181 and combusted and then supplied onto the sintering carriage 130, it will not be useful for sintering the raw material. Therefore, in order to prevent the gaseous fuel from being mixed with the cooler gas and being combusted before being supplied onto the sintering carriage 130, the gaseous fuel may be diluted below the lower limit concentration of combustion. For this reason, even if the gaseous fuel is combined with the high-temperature cooler gas in the first connecting pipe 181, it is burned by the flame in the raw material after being supplied onto the sintering carriage 130 without being burned. What is necessary is just to make it easy to sinter.

  The lower limit concentration of combustion of gaseous fuel varies with temperature. That is, the lower limit concentration of combustion decreases as the temperature of the gaseous fuel increases, and the lower limit concentration of combustion increases as the temperature of the gaseous fuel decreases. For example, when liquefied natural gas (LNG) is used as the gaseous fuel, the lower limit concentration of combustion of liquefied natural gas (LNG) at 200 ° C. may be about 4.2%, and liquefied natural gas (LNG) at 400 ° C. ) May be about 3.6%, and the lower limit concentration of liquefied natural gas (LNG) at 600 ° C. may be about 2.9%.

  Thus, since the lower limit concentration of combustion of gaseous fuel changes according to temperature conditions, it is necessary to change the lower limit concentration of combustion of gaseous fuel according to temperature conditions. For this reason, it is necessary to measure the temperature of the cooler gas that is merged with the gaseous fuel and has the greatest influence on the temperature of the gaseous fuel, and to adjust the lower limit concentration of combustion of the gaseous fuel according to the temperature of the cooler gas.

  That is, if the temperature of the cooler gas is high, even if a small amount of gaseous fuel is supplied, combustion is likely to occur. If the temperature of the cooler gas is low, combustion is difficult to occur unless a large amount of gaseous fuel is supplied. Therefore, the lower limit concentration of combustion of the gaseous fuel corresponding to the temperature of the cooler gas must be confirmed, and the lower limit concentration of combustion of the gaseous fuel must be diluted and supplied on the raw material accordingly. At this time, the temperature of the cooler gas may be 100 ° C to 300 ° C. However, the temperature of the cooler gas is not limited to this, and can be variously changed.

  Thus, since gaseous fuel and a high-temperature cooler gas are supplied to the raw material, combustion is easily performed from the upper part to the lower part of the raw material during the sintering of the raw material. It can be maintained for a long time. For this reason, the quality of the raw material produced | generated improves, The quantity of the raw material produced to be usable compared with the input raw material increases, and productivity improves.

FIG. 4 is a view showing a sintering apparatus according to still another embodiment of the present invention. Hereinafter, a gaseous fuel supply unit of a sintering apparatus according to still another embodiment of the present invention will be described.
As shown in FIG. 4, the gaseous fuel supply unit 160 according to still another embodiment of the present invention forms a path through which the gaseous fuel moves, and has one end connected to the first hood 183. A supply line 161 and an injector 163 that is provided at one end of the fuel supply line 161 and injects the gaseous fuel onto the upper portion of the sintering carriage may be provided, and a control valve 162 may be provided.

  The fuel supply line 161 may be directly connected to the first hood 183. For example, one end of the fuel supply line 161 may be connected through the first hood 183. For this reason, the gaseous fuel supplied to the fuel supply line 161 is mixed with the cooler gas supplied via the first connection pipe 181 in the first hood 183 and supplied onto the sintering carriage 130. May be. Further, a control valve 162 may be provided in the fuel supply line 161 to control the movement of the gaseous fuel. For this reason, when the operation of the control valve 162 is controlled, the amount of the gaseous fuel supplied onto the sintering carriage 130 and the point in time when the gaseous fuel is supplied can be adjusted.

  The injector 163 may be disposed inside the first hood 183, and may be connected to and supported by one end of the fuel supply line 161 that penetrates the first hood 183. For example, the injector 163 may include a plurality of nozzles arranged along the movement path. Alternatively, a body part having a space for gas to flow into the injector 163 may be provided, and a plurality of injection holes may be provided below the body part to inject the gas raw material. That is, the injector 163 may be formed as a shower head type to inject gaseous fuel. As a result, the gaseous fuel that has moved to the injector 163 along the fuel supply line 161 can be discharged onto the sintering carriage 130 via the nozzle. However, the structure of the injector 163 and the method of supplying the gaseous fuel onto the sintering carriage 130 are not limited to this, and can be variously changed.

  Gaseous fuel extends the raw material combustion time, and hot cooler gas provides thermal energy to the raw material. Therefore, since such a gaseous fuel and a high-temperature cooler gas are supplied to the raw material, combustion is easily performed from the upper part to the lower part of the raw material while the raw material is sintered. The state can be maintained for a long time. For this reason, the quality of the raw material produced | generated improves, The quantity of the raw material produced to be usable compared with the input raw material increases, and productivity improves.

FIG. 5 is a flowchart illustrating a sintering method according to an embodiment of the present invention. Hereinafter, a sintering method according to an embodiment of the present invention will be described.
As shown in FIG. 5, the sintering method according to the embodiment of the present invention is a method for producing sintered ore, in which raw materials are charged into a sintering cart that moves along a moving path (S100). ), Igniting the raw material (S200), sucking air in the lower direction of the raw material (S300), and supplying a part of the sucked air to the raw material in the sintering cart (S400), discharging the sintered sinter, supplying a cooler gas to the sinter (S500), and at least part of the cooler gas supplied to the sinter And supplying the raw material in the trolley (S600).

  At this time, in the process of supplying the cooler gas to the raw material, the cooler gas may be supplied to an upper portion of a window box arranged before a half point of the moving path. Note that the movement path may be the same as the movement path described in the sintering apparatus 100.

  First, a plurality of sintered carts 130 are sequentially passed under the charging portion 120 and raw materials are charged into each of the plurality of sintered carts 130 via the charging portion 120 to form a raw material layer. When the plurality of sintering carts 130 sequentially pass under the ignition furnace 110, the ignition furnace 110 ignites the upper portion of the raw material layer, and each sintering cart 130 sinters the raw material while moving through the sintering section. That is, in the process in which the sintering cart 130 moves through the sintering section, the upper flame of the raw material layer moves to the lower part due to the suction of the wind box 140 in the sintering section, and the sintered ore is produced while burning the raw material. Is done.

The sintered raw material, that is, the sintered ore, is discharged from the sintering carriage 130 and then conveyed to the cooler 172 and cooled by the cooler gas supplied from the cooler 172.
At this time, a part of the sucked air may be supplied to the raw material in the sintering cart 130. In particular, air may be sucked in a region between a half point on the moving path of the sintering cart 130 and a point BTP where the temperature of the air sucked into the wind box 140 is maximum.

  In the intermediate region between the half point of the moving path and the BTP, the airflow resistance in the raw material is large, so that the air volume tends to decrease and then increase again. In places where the ventilation resistance is large, the amount of air passing through the raw material from the wind box 140 may be reduced, and sintering may not be performed smoothly. For this reason, the wind box disposed between the half point of the moving route and the BTP is connected to the suction pipe 151 of the second circulation unit 150 and is connected to the suction pipe 151 via the second blower 152. Inhalation of air above the wind box can provide a larger suction input than the main blower 193 provides a suction input to all the wind boxes at locations where the ventilation resistance is large.

  Therefore, even if the ventilation resistance in the combustion zone between the ½ point and the BTP is large, the suction input provided from the second blower 152 is large, so that the sintering is performed between the ½ point and the BTP. It is possible to suppress the reduction of the air volume in the carriage 130 as much as possible. For this reason, the raw materials are smoothly sintered, and the quality of the sintered sinter is improved.

  The air that has flowed into the suction pipe 151 via the wind box 140 is discharged toward the lower raw material via the second hood 154 that is disposed at the upper part of the sintering cart 130. The second hood 154 may supply air to a wind box arranged from the BRP to the end with the movement route as a reference. Since the air sucked in the wind box 140 between the 1/2 point and the BTP contains moisture and has a lower oxygen concentration than the outside air, the raw material in the section where such air is burned is used. There is a possibility that combustion will be hindered if it is supplied to. Therefore, air may be supplied to the rear of the movement path after the BRP where the combustion is almost or completely completed. That is, since the combustion is finished after BRP, even if it contains moisture and low-concentration air on the sintering cart 130 after BRP, the sintering process is not affected. .

  At this time, it is necessary to dispose the wind box 140 below the second hood 154 so that the air discharged from the second hood 154 can be sufficiently sucked. For example, if the lower wind box cannot sufficiently inhale the air discharged from the second hood 154, there is a possibility that the air that has not been inhaled will flow outside and contaminate the environment. Therefore, it is necessary to adjust the length of the second hood 154 in the longitudinal direction or the number of the wind boxes 140 covered by the second hood 154 in consideration of the amount of air that is connected to the suction pipe 151 and sucked. is there.

  On the other hand, the cooler gas generated by cooling the sintered raw material may be circulated through the first circulation unit 180 and reused. Alternatively, the gaseous fuel supply unit 160 may be connected to the first circulation unit 180 to mix the cooler gas and the gaseous fuel, and supply the mixture onto the raw material in the sintering cart 130. In particular, the cooler gas and the gaseous fuel may be supplied to the upper part of the sintering carriage 130 that moves from the point after the raw material is ignited to the half point of the moving path in the moving path.

  In this section, the combustion zone is located above the sintered layer of the raw material. Therefore, the high-temperature cooler gas that has cooled the raw material and absorbed the heat energy is supplied to the raw material in the section between the ignition furnace 110 and the 1/2 point via the first hood 183 of the first circulation unit 180. If it supplies to upper part, a cooler gas will supply thermal energy to a raw material, passing a raw material, and it will become still easier to burn a raw material. For this reason, combustion efficiency improves, productivity improves, and the quantity of the raw material produced to be usable compared with the input raw material increases. Note that energy can be saved by reusing the cooler gas that has absorbed thermal energy.

  At this time, the temperature of the cooler gas is measured, and if the temperature of the cooler gas is equal to or higher than the set temperature, the first circulation unit 180 may supply the cooler gas to the raw material. For example, the set temperature may be 100 ° C. That is, if the temperature of the cooler gas is too low, there is a possibility that while the cooler gas passes through the raw material, the heat of the raw material is taken rather and combustion of the raw material is hindered. For this reason, in order to facilitate the combustion of the raw material, only a cooler gas having sufficient thermal energy, for example, a cooler gas having a temperature of 100 ° C. or higher capable of evaporating moisture in the raw material is supplied to the raw material. Good.

  Accordingly, the temperature of the cooler gas sucked into the first circulation unit 180 is measured, and the temperature of the cooler exhaust gas is compared with the set temperature. When the temperature of the cooler exhaust gas is equal to or higher than the set temperature, the first blower 182 is measured. When the cooler gas is supplied onto the raw material via the first hood 183 and the temperature of the cooler exhaust gas is lower than the set temperature, the operation of the first blower 182 is controlled to control the first operation. The supply of the cooler gas to the hood 183 may be interrupted, and the supply of the cooler gas onto the raw material may be interrupted. However, the set temperature value is not limited to this, and can be variously changed.

  In addition, the gas fuel supply unit 160 may be connected to the first circulation unit 180 to supply the cooler gas and the gas fuel onto the sintering cart 130 together. The gaseous fuel supply unit 160 is connected to the first hood 183 or the first connection pipe 181 of the first circulation unit 180. Therefore, when the gaseous fuel supply unit 160 supplies the gaseous fuel, the gaseous fuel is supplied to the first hood 183 or the first connecting pipe 181 and moves in the first hood 183 or the first connecting pipe 181. It is mixed with the cooler gas and mixed.

Furthermore, the mixed cooler gas and gaseous fuel may be supplied to the raw material in the sintering cart 130 so that the raw material is smoothly sintered.
In the process of mixing the gaseous fuel and the cooler gas, the gaseous fuel may be supplied before the start of the supply of the cooler gas, simultaneously with the supply of the cooler gas, or after the supply of the cooler gas is started. That is, the cooler gas may be supplied while supplying the gaseous fuel onto the sintering cart 130 via the first connecting pipe 181 or the first hood 183, or the gaseous fuel and the cooler gas may be supplied simultaneously. Alternatively, the gaseous fuel may be supplied while the cooler gas is supplied first. However, the order in which the gaseous fuel and the cooler gas are supplied is not limited to this, and can be variously changed.

  Gaseous fuel extends the raw material combustion time, and hot cooler gas provides thermal energy to the raw material. That is, when the gaseous fuel is supplied to the upper surface of the raw material in the sintering carriage 130, the gaseous fuel and the flame generated by the ignition unit 110 in the raw material are merged and become combustible. Combustion of the gaseous fuel can increase the temperature of the raw material, so that the temperature of the upper portion of the raw material in contact with the outside is also likely to increase. In addition, the gaseous fuel supplied from the upper part to the lower part of the raw material is also supplied to the middle part and lower part of the raw material, and is combusted when the flame in the raw material moves downward to increase the combustion efficiency in the raw material. Can be increased. In addition, during such a process, a high-temperature cooler gas is supplied to supply thermal energy to the raw material, so that combustion of the raw material can be promoted, and a decrease in temperature can be suppressed.

  Therefore, since such a gaseous fuel and a high-temperature cooler gas are supplied to the raw material, combustion is easily performed from the upper part to the lower part of the raw material during the sintering of the raw material. The state can be maintained for a long time. For this reason, the quality of the raw material produced | generated improves, The quantity of the raw material produced to be usable compared with the input raw material increases, and productivity improves.

FIG. 6 is a diagram showing a pot experiment apparatus according to an embodiment of the present invention, and FIG. 7 is a graph showing a change in temperature in the sintered layer according to the embodiment of the present invention.
Hereinafter, the present invention will be described in more detail with reference to experimental examples of the present invention.
In order to confirm the effect when the cooler gas used for cooling the sintered ore is supplied to the upper portion of the sintered layer, the cooler gas is supplied to the upper layer portion of the sintered layer using the pot 500 shown in FIG. (Example) and the case where it did not supply (comparative example) were compared.

That is, in the comparative example, the raw material 1 was put in the pot 500 and ignited, and the change in the temperature of the sintered layer was measured. In the example, the raw material 1 was put in the pot 500 and ignited, and high temperature air of about 250 ° C. (cooler gas temperature) was blown in, and the change in the temperature of the sintered layer was measured. To explain, the raw material 1 was charged into the pot 500 at a height of 900 mm. The charging density of the raw material 1 is 1888 kg / m ³ , and the negative pressure is 1700 mmAq. The ignition time is 90 seconds and the ignition temperature is about 1050 ° C. In addition, the temperature of the raw material 1 in the point of A, B, C, D was measured every 255 mm in order from the upper layer part of the raw material 1 to the lower layer part.

Explaining in detail the experimental conditions of the example, the raw material 1 was charged into the pot 500 at a height of 900 mm. The charging density of the raw material 1 is 1888 kg / m ³ , and the negative pressure is 1700 mmAq. The ignition time is 90 seconds and the ignition temperature is about 1050 ° C. Moreover, high temperature air or high temperature gas was supplied to the upper layer part of the raw material 1 for 4 to 11 minutes. At this time, the temperature of the supplied air is about 250 ° C. (cooler gas temperature), and the amount of air blown is 322 L / min (2382 Nm ³ / min). In addition, the temperature of the raw material 1 in the point of A, B, C, D was measured every 255 mm in order from the upper layer part of the raw material 1 to the lower layer part.

As shown in FIG. 7, when high-temperature air was supplied to the upper layer of the raw material, the range of the high-temperature region at the point A of the example increased from the range of the high-temperature region in the comparative example, and the maximum temperature also increased. I understand.
In the examples, the sintering rate (or sintering time) of the raw material at point A was faster (longer) than that of the comparative example, but the sintering rate of the raw material increased after point B. . This is presumed to be because high-temperature air was injected, so that the removal rate of the wet zone increased and the ventilation resistance of the sintered layer decreased. Alternatively, it is also inferred that the sintering speed has been reduced due to the improvement in the air permeability due to the improvement in the sintering quality of the upper layer of the raw material and the increase in the suction flow rate.

  Moreover, in the case of the Example, the range of the high temperature area | region increased from the comparative example in all the AD points | pieces. For this reason, the time to finally reach BTP in the example was shortened compared to the comparative example, and the raw material was burned more efficiently. Accordingly, the quality of the sintered ore is improved from the upper layer portion to the lower layer portion.

  Furthermore, the temperature of the exhaust gas in the example was higher than the exhaust gas temperature in the comparative example. When the temperature of the exhaust gas falls below 130 ° C., moisture is condensed, and there is a risk of corroding the piping that sucks the exhaust gas. Accordingly, the temperature of the exhaust gas must be maintained at 130 ° C. or higher. However, in the case of the exhaust gas in the examples, the temperature is high, so that it is easily maintained at 130 ° C. or higher. For this reason, it is possible to prevent the pipe that sucks the exhaust gas from being corroded.

On the other hand, the arrival time to the BTP, the temperature of the BTP, and the sintering rate in the comparative examples and examples are as shown in Table 1 below.

  Accordingly, as shown in FIG. 7 and Table 1, it can be seen that when a high-temperature cooler gas obtained by cooling the sintered ore is supplied to the upper portion of the sintered layer, sintering is performed at a higher speed at a higher temperature. For this reason, when a high temperature cooler gas is supplied to the upper part of a raw material, it turns out that the improvement effect of the quality of a sintered ore and the energy saving effect are acquired. Since dust in the cooler gas can be automatically removed during the sintering process, environmental pollution due to dust can be prevented.

As described above, specific embodiments have been described in the detailed description of the present invention, but the present invention can be variously modified without departing from the scope of the present invention. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined not only by the claims described below, but also by the equivalents of the claims.

Claims (20)

A plurality of sintering carts arranged movably along the movement path, in which raw materials are charged, and
An ignition furnace that is disposed on the upper portion of the sintering carriage and injects a flame onto the upper surface of the raw material,
A plurality of windows disposed along the movement path at the bottom of the sintering carriage, and a wind box for inhaling air in the lower direction of the sintering carriage to sinter the raw material,
A cooler that is disposed on one side of the travel path and that supplies a cooler gas to the sintered ore discharged from the sintering cart;
A first circulation unit connected to the cooler and supplying at least a part of the cooler gas supplied to the raw material to an upper portion of the sintering cart;
A sintering apparatus comprising:   The sintering apparatus according to claim 1, further comprising a gaseous fuel supply unit that is connected to the first circulation unit and supplies gaseous fuel to the first circulation unit.   The first circulation part is disposed at an upper part of the sintering carriage, and has a first hood extending along the movement path, one end connected to the cooler, and the other end connected to the first hood. The sintering apparatus according to claim 1, further comprising: a first connection line connected to one hood; and a first blower disposed in the first connection line. A second circulation unit connected to a part of the wind box and supplying air sucked into the part of the wind box to an upper part of the sintering cart;
The movement path includes a charging section in which the raw material is charged into the sintering carriage, an ignition section in which the ignition furnace ignites the raw material, and a sintering section in which the raw material is sintered. And
The sintering apparatus according to claim 1 or 2, wherein the first circulation unit and the second circulation unit supply the sucked air or cooler gas to the sintering section.   The second circulation part is connected to a part of the wind box, and is disposed at an upper portion of the sintering carriage, and is formed along a suction path that forms a space in which air is accommodated. A second hood that is extended to the second hood, a second connection line that has one end connected to the suction pipe and the other end connected to the second hood, and the second connection line. The sintering apparatus of Claim 4 provided with the 2nd blower provided.   The first hood disposed in the first circulation unit is disposed between the ignition furnace and the second hood, and the first hood is disposed at a point before 1/2 of the moving path. The sintering apparatus according to claim 5, wherein the sintering apparatus is located at an upper portion of the arranged wind box.   One end of the second hood is arranged between a point after the end of combustion of the raw material and an upper part of a wind box arranged to the end with respect to the movement path. Item 6. The sintering apparatus according to Item 5.   6. The sintering apparatus according to claim 5, wherein a length of the second hood extended is equal to or greater than the number of wind boxes connected to the suction pipe × the length of one wind box. .   The said suction piping is connected with the wind box arrange | positioned from the 1/2 point of the said movement path | route to the point where the temperature of the said inhaled air becomes the maximum. Sintering equipment. The moving path includes a charging section in which the raw material is charged into the sintering cart, an ignition section in which the raw material is ignited, and a sintering section in which the raw material is sintered.
The sintering apparatus according to claim 2, wherein the first circulation unit and the gaseous fuel supply unit supply the cooler gas and the gaseous fuel to the sintering section. The gaseous fuel supply unit has a connection supply line that forms a path through which the gaseous fuel moves.
The sintering apparatus according to claim 10, wherein the connection supply line is connected to a first connection line disposed in the first circulation unit. The gaseous fuel supply unit forms a path through which gaseous fuel moves, and has one end connected to the first hood of the first circulation unit, a fuel supply line;
An injector that is provided at one end of the fuel supply line and injects the gaseous fuel onto an upper portion of the sintering carriage;
The sintering apparatus according to claim 10, further comprising:   The sintering apparatus according to claim 10, wherein the gaseous fuel is supplied after being diluted below a lower limit concentration of combustion. A method for producing sintered ore, comprising:
The process of charging the raw material into the inside of the sintering cart moving along the moving path,
Igniting the raw material;
Inhaling air in the lower direction of the raw material;
Discharging the sintered sinter and supplying a cooler gas to the sinter;
Supplying at least a part of the cooler gas supplied to the sintered ore to the raw material in the sintering cart;
Including
In the process of supplying the cooler gas to the raw material, the cooler gas is supplied to an upper portion of a wind box disposed before a half point of the moving path.   The process of supplying the cooler gas to the raw material in the sintering cart includes the process of measuring the temperature of the cooler gas, and supplying the cooler gas to the raw material if the temperature of the cooler gas is equal to or higher than a set temperature. The sintering method according to claim 14, further comprising: a process.   The sintering method according to claim 14, further comprising a step of supplying gaseous fuel to the cooler gas after supplying the cooler gas to the raw material in the sintering carriage.   The sintering according to claim 14 or 16, further comprising a step of supplying a part of the sucked air to the raw material in the sintering cart after inhaling air in a lower direction of the raw material. Method. In the process of supplying a part of the sucked air to the raw material in the sintering cart,
18. The sintering method according to claim 17, wherein air is sucked in a region between a half point of the moving path and a point where the temperature of the sucked air becomes maximum. In the process of mixing the gaseous fuel,
The sintering method according to claim 16, wherein the gaseous fuel is supplied before the supply of the cooler gas starts, simultaneously with the supply of the cooler gas, or after the supply of the cooler gas starts. In the process of mixing and supplying gaseous fuel to the cooler gas, the cooler gas and gas are placed on the upper part of the sintering carriage that moves from the point where the raw material is ignited to half the moving path. The sintering method according to claim 16, wherein fuel is supplied.

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