JP6688396B2 - Sintering apparatus and sintering method - Google Patents

Description

  The present invention relates to a sintering apparatus and a sintering method, and more particularly, to a sintering apparatus and a sintering apparatus capable of improving the quality and productivity of the sintered ore and reducing the emission of pollutants. It relates to a sintering method.

The sinter used as a raw material in the ironmaking process of the blast furnace is a mixture of iron ore and a binder that is powdered coke (or anthracite), and then the coke is burned and the heat of combustion sinters the iron ore. Produced by.
Ordinary sinter production facilities consist of a bed mine hopper that stores the bed ore and a surge hopper that stores the compounded raw material that is assembled after the iron ore raw material and the coke that is the heat source are mixed. The trucks are arranged side by side in the same direction, and are provided with bedding ore and blended raw materials and are transported in the process progress direction; a conveyor that transports the multiple carts in the process progress direction; Installed on the upper side of the trolley, an ignition furnace for injecting a flame into the sintering raw material charged into the trolley, and a plurality of trolleys are arranged side by side in one direction and are installed side by side on the route transferred in the process proceeding direction, It includes a plurality of wind boxes for sucking the inside of the plurality of carriages, a duct connected to the ends of the plurality of wind boxes, and a blower (not shown) connected to the ducts to generate a suction force.

The above-mentioned sintering process is performed by forming a negative pressure in the wind box arranged at the lower part of the carriage and applying suction force to the carriage. That is, when the blower is driven, the air on the upper side of the truck comes to be sucked into the wind box, and the flame ignited on the upper surface of the sintering raw material moves to the lower side for sintering.
Conventionally, the air sucked in through the windbox is discharged to the outside as an exhaust gas after sintering. However, such gas contains components that pollute the environment. Further, the exhaust gas of sintering has a large amount of thermal energy because it is a gas produced while passing through a high temperature sintered ore. Therefore, when the sintering exhaust gas is discharged to the outside, it may cause environmental pollution and a large amount of energy is lost.

Korean patent KR2014-0016658A

An object of the present invention is to provide a sintering apparatus and a sintering method that can circulate exhaust gas generated during a sintering process to suppress or prevent environmental pollution.
Another object of the present invention is to provide a sintering apparatus and a sintering method capable of supplying exhaust gas and air to a sintering raw material to improve combustion efficiency and increase productivity. .

  The sintering apparatus of the present invention is movably arranged along a moving path, and is installed on the moving path so that a trolley in which the sintering raw material is charged and a flame is injected above the sintering raw material. Ignition furnace, and a plurality of windboxes arranged along the movement path from the lower side of the carriage to provide suction power to the carriage, and arranged on the upper side of the carriage and extended along the movement path. The hood that is formed and a part of the plurality of wind boxes that is connected to a part of the wind box to supply the exhaust gas to the hood, a circulation part, and a hood that supplies air as a sintering raw material. And an air supply unit connected to at least one of the circulation unit.

The circulation part is connected to a part of the plurality of wind boxes to form a circulation pipe that forms a space for storing gas therein and a path through which exhaust gas moves, and one end is connected to the circulation pipe and the other end is connected. Preferably includes a circulation line connected to the hood and a blower installed in the circulation line.
The circulation pipe may be connected to a windbox between a point where the flow rate of the exhaust gas increases and then decreases and a point where the temperature of the exhaust gas becomes maximum.
The hood may be covered from the upper part of the wind box at the point where the combustion of the lowermost layer of the sintering raw material is started to the upper part of the wind box arranged at the end of the movement path.

It is preferable that the number of wind boxes covered by the hood is greater than the number of wind boxes connected to the circulation pipe.
An opening may be formed on an upper surface of the hood, and the air supply unit may include a door unit installed in the hood so as to open and close the opening.
The opening may be closer to the ignition furnace than the part where the circulation line and the hood are connected.

It may further include a pressure sensor installed inside the hood, and a controller that controls the operation of the door unit according to the pressure inside the hood.
The air supply unit may include a supply line that forms a path along which air moves and is connected to the circulation line.
It is preferable to further include an oxygen sensor installed inside the circulation line, and a control unit that adjusts the amount of air supplied to the circulation line according to the oxygen concentration inside the circulation line.

  The method for producing a sintered ore according to the present invention comprises the steps of charging a sinter raw material into a carriage moving along a moving path, igniting a flame on the upper surface of the sinter raw material, and lowering the sinter raw material. The method is characterized by including a step of sucking exhaust gas in a direction and a step of supplying air and a part of the sucked exhaust gas to a sintering raw material in a truck through a hood installed on a moving path.

The step of supplying air to the raw material includes a step of measuring the pressure inside the hood and a step of supplying air to the sintering raw material when the pressure inside the hood is less than a preset pressure value. Is good.
The step of supplying air and a part of the sucked exhaust gas to the sintering raw material preferably includes the step of injecting air from the front end portion of the hood and injecting the exhaust gas from the rear end portion of the hood.
The step of supplying air to the raw material is a step of measuring the oxygen concentration of the inhaled exhaust gas, and the step of supplying air to the sintering raw material when the oxygen concentration of the inhaled exhaust gas is equal to or lower than a preset concentration value. Stages can be included.

According to the embodiment of the present invention, air and exhaust gas generated during the sintering process can be supplied to the sintering raw material to participate in the sintering process. Therefore, since the exhaust gas is circulated and reused, environmental pollution due to the exhaust gas can be suppressed or prevented.
Further, the exhaust gas has a lower oxygen concentration than that of ordinary air, and therefore reduces the combustion efficiency. Therefore, by supplying the exhaust gas together with the air having a high oxygen concentration to the sintering raw material, it is possible to suppress or prevent the combustion efficiency from decreasing. That is, by supplying air, the combustion efficiency of the sintering raw material can be improved, and the productivity of the sintering process is increased.
Further, as the sintering raw material is sintered, the ventilation resistance increases, and the amount of air passing through the sintering raw material decreases. Inhale by force. Therefore, it is possible to prevent the amount of air passing through the sintering raw material from decreasing and to stably burn the sintering raw material. This can improve the quality of the sinter produced.

It is a figure which shows the sintering apparatus which concerns on the Example of this invention. It is a figure which shows the cross-sectional shape of the cross-section phenomenon of a sintered layer in the sintering process which concerns on the Example of this invention, and the characteristic of exhaust gas. It is a figure which shows the sintering apparatus which concerns on another Example of this invention. It is a figure which shows the sintering apparatus which concerns on another Example of this invention. It is a figure which shows the sintering method which concerns on the Example of this invention.

  Hereinafter, embodiments of the present invention will be described in more 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 forms different from each other. As such, it is provided to fully teach those of ordinary skill in the category of invention. The drawings may be exaggerated to explain the invention in detail. Like reference numerals in the drawings denote like elements.

FIG. 1 is a diagram showing a sintering apparatus according to an embodiment of the present invention.
As shown in FIG. 1, a sintering apparatus 100 according to an exemplary embodiment of the present invention is movably arranged along a moving path, and a trolley 110 into which a sintering raw material is charged and an upper portion of the sintering raw material. An ignition furnace 130 installed on the moving path so as to inject a flame onto the moving path, and a plurality of wind boxes 140 arranged along the moving path from the lower side of the dolly 110 so as to provide suction to the dolly 110. The hood 150, which is disposed on the upper side of the carriage 110 and extends along the movement path, is connected to a part of the plurality of wind boxes 140, and exhaust gas sucked into the part of the wind boxes 140 is discharged from the hood. The air supply unit 170 includes a circulation unit 160 for supplying air to the sintering source 150, and an air supply unit 170 connected to at least one of the hood 150 and the circulation unit 160 so as to supply air to the sintering raw material.
Further, the sintering apparatus 100 includes a charging unit 120 for charging the sintering raw material into the carriage 110, and a gas discharge unit connected to the wind box 140 that is not connected to the circulation unit 160 among the plurality of wind boxes 140. 50 and a control unit 190 that controls the operation of the air supply unit 170, and a pressure sensor 181 that measures the pressure inside the hood 150 and an oxygen sensor 182 that measures the oxygen concentration of the exhaust gas drawn into the circulation unit 160. At least one of the above is provided.

The trolley 110 is arranged so as to move in an endless track system, and forms a closed loop to form a moving path on the upper side and a forwarding path on the lower side, and a conversion path that connects the moving path and the forwarding path. In the moving route, the work of charging the sintering raw material into the trolley 110 and performing the sintering is executed, and in the forwarding route, the empty trolley 110 from which the sinter is discharged is moved.
For example, the movement path may be formed to extend in the front-rear direction, located at the forefront in the movement path, and having a charging section in which the charging unit 120 is disposed and a point located behind the charging section. It may include an ignition section in which the furnace 130 is disposed, and a sintering section located behind the ignition section in which the sintering raw material is sintered. That is, when passing through the charging section, the sinter raw material was charged into the trolley 110, when passing through the ignition section, the raw material inside the trolley 110 was ignited by a flame, and the raw material was ignited during the sintering section. Sinter ore is produced while the flame moves from the upper part to the lower part of the sintering raw material. At this time, the carriage 110 moves from the front to the rear of the movement route.
The trolley | bogie 110 forms the space which accommodates a sintering raw material inside, a some is installed in an endless track, and moves a moving path and a forwarding path. Accordingly, it is possible to perform the operation of continuously manufacturing the sintered ore while the plurality of carriages 110 move from the moving route to the forwarding route or move from the forwarding route to the moving route.

The charging section 120 is arranged in the charging section in the movement route. The charging part 120 is located above the trolley 110 so that the sintering raw material can be charged into the open upper part of the trolley 110. The charging unit 120 includes a hopper in which the sintering raw material is stored and a charging chute that is disposed below the hopper and guides the sintering raw material discharged from the hopper to the inside of the carriage 110. As a result, the sintering raw material is charged into the inside of the truck 110 passing through the charging section.
The ignition furnace 130 is arranged in the ignition section in the movement path. The ignition furnace 130 is disposed behind the charging unit 120 and serves to inject a flame from the upper side of the carriage 110 to the raw material charged in the carriage 110. As a result, the charging raw material in the truck 110 passing through the ignition section is ignited.
A plurality of wind boxes 140 are arranged along the moving path, and serve to suck the exhaust gas under the truck 110 passing through the moving path. As a result, the air above the truck 110 passes through the sintering raw material inside the truck 110 and is sucked into the wind box 140. Therefore, the flame ignited on the upper surface of the sintering material sinters the entire sintering material while moving downward along the air.

The gas exhaust unit 50 provides suction force to the wind box 140 that is not connected to the circulation units 160 in the plurality of wind boxes 140, and discharges the inhaled exhaust gas to the outside. The gas discharge part 50 is connected to the lower part of the wind box 140 and includes a suction pipe 51 having a space for storing the exhaust gas sucked therein, a dust collector 52 connected to the suction pipe 51, a main blower 53 and a chimney 54. . As a result, when the main blower 53 generates a suction force, the exhaust gas flowing into the wind box 140 is sucked into the suction pipe 51, filtered through the dust collector 52, and then discharged to the chimney 54. At this time, the exhaust gas is the air that has passed through the sintering raw material and is sucked into the wind box 140.
The circulation unit 160 is connected to a part of the plurality of wind boxes 140 and circulates the exhaust gas that is taken in, and supplies the exhaust gas to the upper portion of the carriage 110. The circulation unit 160 is connected to a part of the plurality of wind boxes 140, forms a path through which the exhaust gas moves, and a circulation pipe 161 that forms a space in which the exhaust gas is housed. One end of the circulation unit 160 is connected to the circulation pipe 161. A circulation line 162 whose other end is connected to the hood 150 and a blower 163 installed in the circulation line 162 are included.
The circulation pipe 161 forms a space in which exhaust gas is stored, and is connected to a part of the plurality of wind boxes 140. Specifically, the circulation pipe 161 is connected to the wind box 140 between a point where the flow rate of the exhaust gas increases and then decreases and a point where the temperature of the exhaust gas becomes maximum.

FIG. 2 is a diagram showing a sectional shape of a sectional phenomenon of a sintered layer and a characteristic of exhaust gas during a sintering process according to an embodiment of the present invention.
The combustion zone is a region where the sintering raw material is actively combusted and the temperature is high. As shown in FIG. 2, the combustion zone is gradually moved downward by the air sucked from the upper portion to the lower portion, and the upper portion of the combustion zone is cooled by the air at room temperature. At this time, since the ventilation resistance of the combustion zone is larger than that of the unsintered sintering raw material, when the thickness of the combustion zone increases, the amount of exhaust gas sucked into the wind box 140 decreases. Therefore, the point A where the exhaust gas flow rate increases and then decreases is the point where the ventilation resistance inside the bogie 110 increases (the point where the combustion zone thickness increases).

On the other hand, the high temperature air that has passed through the combustion zone encounters the unsintered sintering raw material in the lower part of the combustion zone, so that the temperature is lowered. The water vapor vaporized in the combustion zone is condensed to form a wet zone. When the combustion zone reaches the bottom of the truck 110, the wet zone and the unsintered sintering raw material layer are lost. Therefore, the high temperature air that has passed through the combustion zone is not cooled while passing through the unsintered sintering raw material or the wet zone, and is sucked into the wind box 140 in a high temperature state. As a result, after the temperature of the exhaust gas sucked into the wind box 140 rises to the maximum temperature, the temperature decreases from the point where the sintering of the sintering raw material is almost completed.
Since the ventilation resistance increases in the wind box 140 between the point where the flow rate of the exhaust gas increases and then decreases and the point where the temperature of the exhaust gas becomes maximum (BTP: Burn Through Point), air is smoothly taken in. As described above, only the wind box 140 in this area may be separately connected to the circulation pipe 161 to provide a suction force larger than that of the other wind boxes 140. That is, although the ventilation resistance increased as the thickness of the combustion zone increases, the suction force of the wind box 140 can be increased to increase the air volume. Therefore, the productivity and quality of the sintered ore produced by smoothly sintering the sintering raw material are improved.

Further, when the wind box 140 before the point A where the flow rate of exhaust gas increases and then decreases and the circulation pipe 161 are connected, the combustion speed increases, but the air is cooled faster. Therefore, the heat supplied to the sintered layer is insufficient, and the strength of the sintered ore decreases. Therefore, the wind box 140 and the circulation pipe 161 must be connected at a point where the flow rate of the exhaust gas increases and then decreases, or a point thereafter.
Furthermore, the point A where the flow rate of the exhaust gas increases and then decreases is also the point where SOx is generated. SOx reacts with the moisture in the exhaust gas to generate sulfuric acid and corrodes the inside of the circulation pipe 161. Therefore, it is preferable that the high-temperature exhaust gas is also flown into the circulation pipe 161 so that the temperature inside the circulation pipe 161 becomes equal to or higher than the acid dew point at which sulfuric acid is generated. Accordingly, it is preferable that the wind box 140 is connected to the circulation pipe 161 to a point where the exhaust gas temperature becomes maximum, and the internal temperature of the circulation pipe 161 is raised by the high temperature exhaust gas.
Alternatively, a wind box up to a point where the flow rate of the exhaust gas increases and then decreases, or a point where the coal contained in the sintering raw material is exhausted, or an inflection point (BRP: Burn Rising Point) of the temperature gradient of the exhaust gas. It is preferable to connect 140 and the circulation pipe 161.

At this time, it is preferable to install a flow sensor for measuring the flow rate of the exhaust gas and a temperature sensor for measuring the temperature of the exhaust gas in each wind box 140. Accordingly, it is possible to know the positions of the points in the plurality of wind boxes 140 where the flow rate of the exhaust gas increases and then decreases and where the temperature of the exhaust gas becomes maximum.
The circulation line 162 forms a path along which the exhaust gas moves. The circulation line 162 has one end connected to the lower portion of the circulation pipe 161 and the other end connected to the upper portion of the hood 150. As a result, the exhaust gas sucked into the circulation pipe 161 moves along the circulation line 162 and is supplied to the hood 150.
The blower 163 is installed in the circulation line 162 and generates a suction force. As a result, the exhaust gas is sucked into the wind box 140, and the exhaust gas sucked into the wind box 140 is supplied to the hood 150 via the circulation line 162.

The blower 163 provides a suction force to the wind box 140 connected to the circulation pipes 161 in the plurality of wind boxes 140, and the main blower 53 provides a suction force to the wind box 140 connected to the suction pipe 51. To do. As a result, one blower can provide a greater suction force to each wind box 140 than when a suction force is provided to all the wind boxes 140. At this time, the number of windboxes 140 connected to the circulation pipe 161 is smaller than the number of windboxes 140 connected to the suction pipe 51. Therefore, even if the suction force generated by the blower 163 is the same as the suction force generated by the main blower 53, a larger suction force can be generated in the wind box 140 connected to the circulation pipe 161. That is, it is possible to provide a larger suction force to a region having a large ventilation resistance and suppress or prevent a decrease in the flow rate of exhaust gas.
The hood 150 is spaced apart from the upper side of the truck 110 and serves to supply the exhaust gas sucked into the circulation pipe 161 to the sintering raw material in the truck 110. The hood 150 is formed to extend in the front-rear direction. The hood 150 has an upper portion and a side surface clogged so as to cover an upper portion of the wind box 140, and a lower portion is opened. Therefore, the exhaust gas supplied to the inside of the hood 150 is discharged to the lower part of the hood 150.

For example, the hood 150 is arranged at the end of the movement path from the upper part of the wind box 140 at the point where the combustion of the lowermost layer of the sintering raw material is started (or the point where the combustion zone reaches the lower part of the carriage 110). The wind box 140 is extended and formed so as to cover the upper part of the wind box 140.
Exhaust gas is generated when air passes through the sintering raw material, but the sintering raw material is burned by oxygen in the air. Therefore, the exhaust gas has a lower oxygen concentration than ordinary air. If such an exhaust gas is supplied to the part where combustion is most actively performed, the productivity and quality of the sinter will decrease.
On the other hand, the exhaust gas can be circulated by supplying the exhaust gas to a region where combustion is less likely to occur. That is, the hood 150 is a point where the combustion is completely started (or a point where the combustion of the lowermost layer of the sintering raw material is started) to a point where the combustion is completely completed (or a point at the end of the moving path). It may be extended so as to supply the exhaust gas to the wind box 140 between them.

Further, it is preferable that the number of wind boxes 140 covered by the hood 150 is larger than the number of wind boxes 140 connected to the circulation pipe 161. Since the exhaust gas sucked into the circulation pipe 161 has a high temperature, it has a larger volume than ordinary air. Since the volume of the exhaust gas that can be inhaled by the wind box 140 is limited, if the number of the wind boxes 140 covered by the hood 150 is small (or the area in which the hood 150 supplies the exhaust gas is reduced), the hood 150 will be reduced. A part of the exhaust gas discharged from the exhaust gas cannot be completely sucked into the wind box 140 and may flow out to the outside to cause environmental pollution.
When the length of the hood 150 is increased and the number of the wind boxes 140 covered by the hood 150 is increased, the exhaust gas discharged from the hood 150 can be completely sucked into the wind box 140. It is possible to prevent the discharged exhaust gas from flowing out. Therefore, the number of wind boxes 140 covered by the hood 150 may be increased more than the number of the wind boxes 140 connected to the circulation pipe 161 so that the wind box 140 can suck all the exhaust gas discharged from the hood 150. preferable. At this time, the position of the front end of the hood 150 and the position of the rear end of the circulation pipe 161 can overlap each other with reference to the front-back direction.

The air supply unit 170 according to the exemplary embodiment of the present invention includes a door unit 171 installed on the hood 150. At this time, an opening may be formed on at least a part of the upper surface of the hood 150, and the opening may be installed in the hood 150 to open and close the opening. Further, the air supplied from the air supply unit 170 may be ordinary air that has not passed through the sintering raw material or external air (outside air).
For example, the opening of the hood 150 is formed in a rectangular shape, and the door unit 171 includes a plate that covers the opening and a driver that moves the plate.
The plate is formed corresponding to the shape of the opening and is slidably installed on the hood 150. For example, the plate is installed on the upper surface of the hood 150 so as to be able to move back and forth, so that when the plate is advanced, the plate is positioned corresponding to the opening and closes the opening. On the contrary, when the plate is moved backward, the opening is opened while the plate moves. Therefore, when the opening of the hood 150 is opened, the outside air flows into the hood 150. Closing the opening of the hood 150 blocks outside air from flowing into the hood 150. However, the structure and shape of the plate and the method of installing the plate on the hood 150 are not limited thereto and may be various.

The driver serves to move the plate. For example, the driving machine is a cylinder, one end of which is connected to the plate and the other end of which is fixed to the hood 150. Thus, when one end of the drive machine advances, the plate advances and closes the opening of the hood 150, and when one end of the drive machine moves backward, the plate moves backward and opens the opening of the hood 150. However, the method of moving the plate by the driver is not limited to this, and may be various.
At this time, the opening is arranged so as to contact the ignition furnace 130 from the portion where the circulation line 162 and the hood 150 are connected. That is, the opening is located in front of the portion where the circulation line 162 and the hood 150 are connected. For example, based on the front-back direction, the opening is formed before (or in the center of) the half point of the hood 150, and the circulation line 162 is connected to the part after the half point of the hood 150. be able to. Therefore, air flows into the front windbox 140 in the windbox 140 covered by the hood 150, and circulating gas is supplied to the rear windbox 140. That is, in the trolley 110 that passes through the front wind box 140 in the wind box 140 covered by the hood 150 and in the front trolley 110 that passes through the rear wind box 140, the combustion is It is executed more actively. That is, more oxygen must be supplied to the truck 110 located in front. As a result, air is supplied to the front bogie 110 in which combustion is performed more actively, and exhaust gas with a smaller amount of oxygen is supplied to the rear bogie 110.
Further, the pressure sensor 181 is preferably installed inside the hood 150. The pressure sensor 181 serves to measure the pressure inside the hood 150. One pressure sensor 181 is provided to measure the pressure at any one position inside the hood 150, or a plurality of pressure sensors 181 are provided to measure the pressure at a plurality of positions inside the hood 150.

The control unit 190 serves to control the operation of the door unit 171 according to the pressure inside the hood 150. The controller 190 is connected to the pressure sensor 181 and transmits / receives information on the pressure inside the hood 150, and the pressure inside the hood 150 connected to the transceiver 191 and entering the transmitter / receiver 191 and preset. A judging device 192 for comparing the set pressure values, and a controller 193 for controlling the operation of the driving device based on the judgment of the judging device 192 may be included.
The determination device 192 compares the pressure inside the hood 150 with the set pressure value, and if the pressure inside the hood 150 is less than the set pressure value, sends a signal to the controller to open the opening of the hood 150. send. At this time, the set pressure value is preferably atmospheric pressure. That is, in order for air to flow into the hood 150, the pressure inside the hood 150 should be lower than atmospheric pressure. Therefore, when the pressure inside the hood 150 is lower than the atmospheric pressure, when the opening is opened, the outside air itself flows into the hood 150 through the opening.
Conversely, if the pressure inside the hood 150 is higher than the set pressure value, the controller closes the opening of the hood 150. That is, if the pressure inside the hood 150 is higher than the atmospheric pressure, the gas inside the hood 150 is released to the outside. As a result, the exhaust gas inside the hood 150 may be emitted to the outside and pollute the environment. Therefore, when the pressure inside the hood 150 is higher than the outside pressure, the opening of the hood 150 is closed to prevent the exhaust gas inside the hood 150 from flowing out. However, the set pressure value is not limited to this and can be various.

FIG. 3 is a diagram showing a sintering apparatus according to another embodiment of the present invention.
As shown in FIG. 3, an air supply unit 170 according to another embodiment of the present invention forms a path through which air moves, a supply line 175 connected to a circulation line, and a control valve installed in the supply line 175. 176, including a chiller (not shown) installed in the supply line 175 to cool the air.

One end of the supply line 175 is connected to the circulation line 162, and air is injected into the other end. Thus, the air moving along the supply line 175 is supplied to the circulation line 162, mixed with the exhaust gas moving in the circulation line 162, and supplied to the hood 150.
The control valve 176 plays a role of opening and closing a moving path of air formed by the supply line 175. Accordingly, when the control valve 176 is opened, air is supplied to the circulation line 162, and when the control valve 176 is closed, air is not supplied to the circulation line 162.
The cooler (not shown) is located between the control valve 176 and the other end of the supply line 175 and serves to cool the air moving along the supply line 175. That is, since the exhaust gas moving along the circulation line 162 has a high temperature, it has a large volume. Therefore, by supplying cooled air to the circulation line 162 in order to lower the temperature of the high-temperature exhaust gas, the exhaust gas mixed with the air has a lower temperature and a smaller volume.

An oxygen sensor 182 that measures the oxygen concentration of the exhaust gas is preferably installed inside the circulation line 162. The oxygen sensor 182 serves to measure the oxygen concentration of the gas passing through the circulation line 162.
At this time, the control unit 190 adjusts the amount of air supplied to the circulation line 162 according to the oxygen concentration inside the circulation line 162. The control unit 190 is connected to the oxygen sensor 182 and transmits / receives the oxygen concentration information of the exhaust gas. The control unit 190 is connected to the transceiver 191 and enters the transmitter / receiver 191. And a controller 193 for controlling the operation of the control valve 176 based on the judgment of the judgment device 192.
The judging device 192 compares the oxygen concentration of the exhaust gas with the set concentration value, and when the oxygen concentration of the exhaust gas is less than or equal to the set concentration value, sends a signal to the control device 193 to open the control valve 176. For example, the set density value is selected from among the values of 13 to 16%. That is, the oxygen concentration of the exhaust gas is lower than that of ordinary air. Therefore, the exhaust gas lowers the combustion efficiency of the sintering raw material as compared with ordinary air. Therefore, if the oxygen concentration of the exhaust gas is too low, it is preferable to supply air to the exhaust gas to increase the oxygen concentration. However, the set density value is not limited to this and can be various.

FIG. 4 is a diagram showing a sintering apparatus according to another embodiment of the present invention.
As shown in FIG. 4, an air supply unit 170 according to another embodiment of the present invention includes a door unit 171 that opens and closes an opening formed in the hood 150, a drive unit that moves the door unit 171, and a circulation unit. A supply line 175 connected to the line 162 to supply air and a control valve 176 for opening and closing the supply line 175 are all included. Further, the pressure sensor 181 may be installed inside the hood 150, and the oxygen sensor 182 that measures the oxygen concentration of the exhaust gas may be installed inside the circulation line 162.
At this time, the control unit 190 controls the operation of the door unit 171 according to the pressure inside the hood 150, and determines the amount of air supplied to the circulation line 162 according to the oxygen concentration inside the circulation line 162. adjust. The control unit 190 is connected to the pressure sensor 181 and the oxygen sensor 182, and transmits / receives pressure information inside the hood 150 and information on the oxygen concentration of exhaust gas, and a transceiver 191 connected to the transceiver 191. In the driving machine and the control valve 176 based on the judgment of the judgment machine 192, which compares the internal pressure of the entering hood 150 and the oxygen concentration of the exhaust gas with the preset pressure value and the preset concentration value, respectively. And a controller 193 for controlling the operation of at least one of the above.

The determination device 192 compares the pressure inside the hood 150 with the set pressure value, and if the pressure inside the hood 150 is less than the set pressure value, sends a signal to the controller 193 to open the opening of the hood 150. send. On the contrary, if the pressure inside the hood 150 is higher than the set pressure value, the controller 193 sends a signal to close the opening of the hood 150.
The judging device 192 compares the oxygen concentration of the exhaust gas with the set concentration value, and when the oxygen concentration of the exhaust gas is less than or equal to the set concentration value, sends a signal to the control device 193 to open the control valve 176. When the oxygen concentration of the exhaust gas is equal to or lower than the set concentration value, the operation of the driving machine is controlled to send a signal to open the opening of the hood 150. This allows air to flow into the hood 150 and increase the concentration of oxygen supplied to the sintering raw material.

FIG. 5: is a figure which shows the sintering method which concerns on the Example of this invention.
As shown in FIG. 5, a sintering method according to an exemplary embodiment of the present invention is a method of manufacturing a sinter, and a step S100 of charging a sinter raw material into a truck moving along a moving path, The step S200 of igniting a flame on the upper surface of the sintering raw material, the step S300 of inhaling the exhaust gas toward the lower side of the sintering raw material, and the air and a part of the inhaled exhaust gas through a hood installed on the moving path. And S400 for supplying the sintering raw material in the trolley.

First, the sintering raw material is charged into each of the carriages 110 while sequentially passing the plurality of carriages 110 below the charging portion 120 to form a raw material layer. When the plurality of carriages 110 sequentially pass under the ignition furnace 130, a flame is injected in the ignition furnace 130 to ignite the flame on the upper surface of the raw material layer. When the truck 110 passes through the wind box 140, the air sucked from the upper part to the lower part sinters the sintering raw material while moving the flame downward, thereby producing a sintered ore. The sinter is supplied to a cooler (not shown) and cooled.
At this time, the air (or the exhaust gas) sucked into a part of the wind box 140 is supplied to the sintering raw material inside the truck 110 passing through the moving path. In particular, the exhaust gas sucked into the wind box 140 can be circulated between the point where the flow rate of the exhaust gas increases and then decreases and the point where the temperature of the exhaust gas becomes maximum.
The sintering raw material in the truck 110 in which the ventilation resistance of the sintering raw material in the truck 110 passing between the point where the flow rate of the exhaust gas increases and then decreases and the point where the temperature of the exhaust gas reaches the maximum passes through the other portion. Greater than the ventilation resistance of. In a portion having a high ventilation resistance, the amount of air passing through the sintering raw material may decrease, and the progress of sintering may not be smooth.

A wind box that connects the wind box 140 and the circulation pipe 161 between a point where the flow rate of the exhaust gas increases and then decreases and a point where the temperature of the exhaust gas becomes maximum, and is connected to the circulation pipe 161 via a blower 163. When the suction force is provided to 140, the wind box 140 connected to the circulation pipe 161 can suck air with a higher suction force.
Therefore, even if the ventilation resistance of the sintering raw material passing between the point where the flow rate of the exhaust gas increases and then decreases and the point where the temperature of the exhaust gas becomes maximum is large, the suction force provided from the blower 163 also increases. It is possible to minimize the reduction of the air volume passing through the sintering raw material. As a result, the sintering of the sintering raw material proceeds smoothly, and the quality of the sintered ore is improved.
The exhaust gas sucked into the circulation pipe 161 is supplied to the hood 150 arranged above the carriage 110 via the circulation line 162. The hood 150 is a wind box arranged at the end of the movement path from the upper part of the wind box 140 at the point where the combustion of the lowermost layer of the sintering raw material is started (or the point where the combustion zone reaches the lower part of the carriage 110). It may be extended so as to cover the upper portion of 140. That is, since the oxygen concentration of the exhaust gas is smaller than that of ordinary air, the hood 150 supplies the exhaust gas to a region where combustion is less likely (or a region where less oxygen is needed).

Below the hood 150, the windboxes 140 should be arranged in a number of at least enough to sufficiently suck the exhaust gas discharged from the hood 150. For example, if the lower wind box 140 does not sufficiently suck the air discharged from the hood 150, the air that has not been sucked may flow out to the outside and pollute the environment. Therefore, it is necessary to adjust the length of the hood 150 in the front-rear direction or the number of the wind boxes 140 covered by the hood 150 in consideration of the amount of air that is connected to the circulation pipe 161 and is taken in.
Further, external air can be supplied to the sintering raw material inside the trolley 110 passing through the movement path. Since the exhaust gas has a lower oxygen concentration than ordinary air, it reduces the combustion efficiency of the sintering raw material. This makes it possible to supply air having a higher oxygen concentration than exhaust gas together with the exhaust gas to the sintering raw material to improve the combustion efficiency of the sintering raw material.
The air can be directly supplied to the sintering raw material through the hood 150, or the exhaust gas and air can be mixed and supplied to the sintering raw material. For example, the operation of the door unit 171 that opens and closes the opening of the hood 150 is controlled.

First, the pressure inside the hood 150 is measured. The pressure inside the hood 150 is compared with the set pressure value, and if the pressure inside the hood 150 is less than the set pressure value, the opening of the hood 150 is opened. At this time, the set pressure value is atmospheric pressure. That is, in order for air to flow into the hood 150, the pressure inside the hood 150 must be lower than atmospheric pressure. Therefore, when the pressure inside the hood 150 is lower than the atmospheric pressure, when the opening is opened, the outside air flows into the inside of the hood 150 through the opening and is supplied to the sintering raw material.
On the contrary, if the pressure inside the hood 150 is higher than the set pressure value, the opening of the hood 150 is closed. That is, if the pressure inside the hood 150 is higher than the atmospheric pressure, the gas inside the hood 150 is released to the outside. As a result, the exhaust gas inside the hood 150 is released to the outside, which may pollute the environment. Therefore, when the pressure inside the hood 150 is higher than the pressure outside, the opening of the hood 150 is closed to prevent the exhaust gas inside the hood 150 from flowing out.
At this time, air can be injected from the front end of the hood and exhaust gas can be injected from the rear end of the hood. For example, with reference to the front-rear direction, air can be injected in a region before the half point (or the central portion) of the hood 150, and exhaust gas can be injected in a region after the half point of the hood 150. . That is, the opening is formed in a region before the half point of the hood 150, and the region after the half point of the hood 150 is connected to the circulation line 162 to supply the exhaust gas.

Of the windboxes 140 covered by the hood 150, combustion is more active in the bogie 110 that passes through the windbox 140 located in the front and the bogie 110 that passes through the windbox 140 located in the rear and located in the front. Done. Therefore, more oxygen is supplied to the truck 110 located in front of the truck 110, and the combustion efficiency is improved. As a result, it is preferable to supply air to the front bogie 110 in which combustion is performed more actively and to supply exhaust gas with a smaller amount of oxygen to the rear bogie 110.
On the other hand, it is preferable to measure the oxygen concentration of the exhaust gas moving in the circulation line 162. Then, the oxygen concentration of the exhaust gas is compared with the set concentration value, and if the oxygen concentration of the exhaust gas is less than or equal to the set concentration value, the control valve 176 is opened. For example, as the set density value, any one of the values between 13 and 16% can be selected. Thereby, when the oxygen concentration of the exhaust gas is too low, air is supplied to the exhaust gas to increase the oxygen concentration. Therefore, the gas in which the exhaust gas and the air are mixed is supplied to the sintering raw material.
Alternatively, if the oxygen concentration of the exhaust gas is equal to or lower than the set concentration value, the opening of the hood 150 can be opened. This allows air to flow into the hood 150 and increase the concentration of oxygen supplied to the sintering raw material. However, the time when the opening is opened is not limited to this, and may be always opened.

In this way, air and exhaust gas generated during the sintering process are supplied to the sintering raw material to participate in the sintering process. Therefore, since the exhaust gas is circulated and reused, environmental pollution due to the exhaust gas can be suppressed or prevented.
Further, since the exhaust gas has a lower oxygen concentration than that of ordinary air, the combustion efficiency will be reduced. Therefore, the air having a high oxygen concentration is supplied together with the exhaust gas to the sintering raw material to suppress or prevent the combustion efficiency from decreasing. That is, by supplying air, the combustion efficiency of the sintering raw material can be improved, and the productivity of the sintering process can be increased.
In addition, as the sintering raw material progresses in sintering, the ventilation resistance may increase and the amount of air passing through the sintering raw material may decrease. Can be inhaled by force. Therefore, it is possible to prevent the amount of air passing through the sintering raw material from decreasing and to stably burn the sintering raw material. This can improve the quality of the sinter produced.

  As described above, in the detailed description of the present invention, specific embodiments have been described, but various modifications can be made 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 by the following claims and equivalents thereof.

50: Gas discharge part 51: Suction pipe 52: Dust collector 53: Main blower 54: Chimney 100: Sintering device 110: Carriage 120: Charge part 130: Ignition furnace 140: Wind box 150: Hood 160: Circulation part 161: Circulation Piping 162: Circulation line 163: Blower 170: Air supply unit 171: Door unit 175: Supply line 176: Control valve 181: Pressure sensor 182: Oxygen sensor 190: Control unit 191: Transceiver 192: Judgment machine 193: Controller

Claims (13)

A trolley that is movably arranged along the movement path and in which the sintering raw material is charged,
An ignition furnace installed on the moving path so as to inject a flame above the sintering raw material,
A plurality of wind boxes arranged along the movement path from the lower side of the truck so as to provide suction to the truck;
A hood that is arranged on the upper side of the carriage and that is formed by being extended along the movement path,
A circulation unit that is connected to a part of the plurality of wind boxes and supplies the exhaust gas that has been sucked into a part of the wind boxes to the hood,
To supply air as the sintering raw material, saw including a, an air supply unit to be connected to at least one of the hood and the circulation unit,
The sintering apparatus is characterized in that the hood covers from the upper part of the wind box at the point where the combustion of the lowermost layer of the sintering raw material is started to the upper part of the wind box arranged at the rearmost part of the movement path . The circulation unit is
A circulation pipe that is connected to a part of the plurality of wind boxes and forms a space in which a gas is stored,
A circulation line that forms a path through which exhaust gas moves, one end of which is connected to the circulation pipe and the other end of which is connected to the hood,
The blower installed in the said circulation line is included , The sintering apparatus of Claim 1 characterized by the above-mentioned. The sintering apparatus according to claim 2, wherein the circulation pipe is connected to a wind box between a point where the flow rate of the exhaust gas decreases and then increases and a point where the temperature of the exhaust gas becomes maximum.   The sintering apparatus according to claim 2, wherein the number of wind boxes covered by the hood is larger than the number of wind boxes connected to the circulation pipe. An opening is formed on the upper surface of the hood,
The sintering apparatus according to claim 2, wherein the air supply unit includes a door unit installed in the hood so as to open and close the opening. The sintering apparatus according to claim 5 , wherein the opening is closer to the ignition furnace than a portion where the circulation line and the hood are connected. A pressure sensor installed inside the hood,
Sintering apparatus of claim 6, further comprising a control unit for controlling the operation of said door unit in response to the pressure of the interior of the hood. The sintering apparatus according to any one of claims 2 to 7 , wherein the air supply unit includes a supply line that forms a path through which air moves and that is connected to the circulation line. An oxygen sensor installed inside the circulation line,
Sintering apparatus of claim 8, further comprising a control unit for adjusting the amount of air supplied to the circulation line in accordance with the oxygen concentration inside the circulation line. A method for producing a sinter, comprising:
Charging the sintering raw material into a trolley that moves along the movement path,
Igniting a flame on the upper surface of the sintering raw material,
Inhaling exhaust gas in the lower direction of the sintering raw material,
A table is provided with a hood that covers air and part of the inhaled exhaust gas from the upper part of the wind box at the point where the combustion of the lowermost layer of the sintering raw material is started to the upper part of the wind box arranged at the end of the moving path. sintering method which comprises a step of supplying the raw material to be sintered in the vehicle, a. The step of supplying the air and a part of the inhaled exhaust gas to the raw material,
Measuring the pressure inside the hood;
The pressure inside the hood, if less than a preset pressure value, the sintering method according to claim 10, characterized in that it comprises, and supplying air to the sintering raw material. The step of supplying the air and a part of the inhaled exhaust gas to the sintering raw material,
The sintering method according to claim 11 , further comprising the step of injecting air from a front end portion of the hood and injecting exhaust gas from a rear end portion of the hood. The step of supplying the air and a part of the inhaled exhaust gas to the raw material,
Measuring the oxygen concentration of the inhaled exhaust gas;
If the oxygen concentration of the inhaled gas is less than a preset density value, the sintering method according to claim 10, characterized in that it comprises, and supplying air to the sintering material.

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