WO2017159962A1 - 소결장치 및 소결방법 - Google Patents

소결장치 및 소결방법 Download PDF

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Publication number
WO2017159962A1
WO2017159962A1 PCT/KR2016/013625 KR2016013625W WO2017159962A1 WO 2017159962 A1 WO2017159962 A1 WO 2017159962A1 KR 2016013625 W KR2016013625 W KR 2016013625W WO 2017159962 A1 WO2017159962 A1 WO 2017159962A1
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WO
WIPO (PCT)
Prior art keywords
hood
exhaust gas
raw material
air
sintering
Prior art date
Application number
PCT/KR2016/013625
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English (en)
French (fr)
Korean (ko)
Inventor
박종인
정해권
정은호
조병국
최익수
Original Assignee
주식회사 포스코
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to EP16894692.9A priority Critical patent/EP3431909B1/en
Priority to JP2018539316A priority patent/JP6688396B2/ja
Priority to CN201680083324.3A priority patent/CN108779960A/zh
Publication of WO2017159962A1 publication Critical patent/WO2017159962A1/ko

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D1/00—Casings; Linings; Walls; Roofs
    • F27D1/18—Door frames; Doors, lids, removable covers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D19/00—Arrangements of controlling devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D7/00—Forming, maintaining, or circulating atmospheres in heating chambers
    • F27D7/02—Supplying steam, vapour, gases, or liquids

Definitions

  • the present invention relates to a sintering apparatus and a sintering method, and more particularly, to a sintering apparatus and a sintering method capable of improving the quality and productivity of the sintered ore and reducing the emission of pollutants.
  • the sintered ore used as a raw material in the blast furnace making process is produced by mixing iron ore and a binder of powdered coke (or anthracite), and then burning the coke and sintering the iron ore with the heat of combustion.
  • General sintered ore manufacturing equipment is a top light hopper that stores the top light, a surge hopper to store the assembled raw materials after mixing the iron ore raw material and coke as a heat source, arranged in one direction, the process proceeds by receiving the top light and the raw material
  • the ignition furnace is installed on the upper side of the trolley conveyed in the process progress direction by the conveyor, the conveyor which transfers the several trolley
  • a plurality of trucks are arranged in one direction and arranged on a path transported in the process progress direction, a plurality of wind boxes sucking the inside of the plurality of trucks, a duct connected to the ends of the plurality of wind boxes, a duct connected to the duct Generating blower (not shown).
  • the sintering process is performed by forming a negative pressure of the wind box disposed below the bogie and applying suction to the bogie. That is, when the blower is driven, the wind box sucks the air above the trolley, and sintering proceeds while the flame complexed to the upper surface of the sintered raw material moves downward.
  • the sintered exhaust gas which is air sucked through the windbox, is discharged to the outside.
  • these gases contain components that can pollute the environment.
  • the sintered flue gas is a gas generated while passing through a high temperature sintered ore, it has a lot of thermal energy. Therefore, when the sintered flue gas is discharged to the outside, it may cause environmental pollution, and a lot of energy may be lost.
  • Patent Document 1 KR2014-0016658 A
  • the present invention provides a sintering apparatus and a sintering method which can suppress or prevent environmental pollution by circulating exhaust gas generated during the sintering process.
  • the present invention provides 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 present invention is disposed so as to be movable along a movement path, and a trolley in which a raw material for sintering is charged;
  • An ignition furnace installed on the movement path to inject a flame onto the sintered raw material;
  • a plurality of wind boxes disposed along the movement path at the lower side of the bogie to provide suction to the bogie;
  • a hood disposed above the bogie and extending along the movement path;
  • a circulation part connected to a part of the plurality of windboxes and supplying exhaust gas sucked into the part of the windboxes to the hood;
  • an air supply unit connected to at least one of the hood and the circulation unit to supply air to the sintered raw material.
  • the circulation unit may include a circulation pipe connected to a portion of the plurality of windboxes and forming a space in which gas is received; A circulation line forming a path through which exhaust gas moves and having one end connected to the circulation pipe and the other end connected to the hood; And a blower installed in the circulation line.
  • the circulation pipe is connected to the wind boxes between the point where the flow rate of the exhaust gas increases and decreases and the temperature at which the temperature of the exhaust gas is maximized.
  • the hood covers an upper portion of the windbox at the point where combustion of the lowermost layer of the sintered raw material begins, and an upper portion of the windbox disposed at the rearmost portion of the movement path.
  • the number of windboxes covered by the hood is greater than the number of windboxes connected to the circulation pipe.
  • An opening is formed in an upper surface of the hood, and the air supply unit includes a door unit installed in the hood to open and close the opening.
  • the opening is closer to the ignition furnace than the portion where the circulation line and the hood are connected.
  • a pressure sensor installed inside the hood; And a control unit controlling the operation of the door unit according to the pressure inside the hood.
  • the air supply unit includes a supply line forming a path through which air moves and connected to the circulation line.
  • An oxygen sensor installed inside the circulation line; And a control unit controlling an amount of air supplied to the circulation line according to the oxygen concentration in the circulation line. It includes more.
  • the present invention provides a method of manufacturing a sintered ore, the process of charging the sintered raw material in the trolley moving along the movement path; Complexing a flame on an upper surface of the sintered raw material; Sucking exhaust gas in a downward direction of the sintered raw material; And supplying some of the air and the sucked exhaust gas to the sintered raw material in the truck through a hood installed on the movement path.
  • the process of supplying some of the air and the sucked exhaust gas as a sintering raw material includes injecting air at the front end of the hood and injecting the exhaust gas at the rear end of the hood.
  • the exhaust gas generated during the air and the sintering process may be supplied to the sintering raw material to be involved in the sintering process. Therefore, the exhaust gas is circulated and reused to suppress or prevent environmental pollution caused by the exhaust gas.
  • exhaust gas has a lower oxygen concentration than ordinary air
  • combustion efficiency can be reduced. Accordingly, since the air having a high oxygen concentration together with the exhaust gas is supplied to the sintered raw material, it is possible to suppress or prevent the combustion efficiency from decreasing. That is, by supplying air can improve the combustion efficiency of the sintered raw material, the productivity of the sintering process can be increased.
  • the ventilation resistance may increase, thereby reducing the amount of air passing through the sintered raw material.
  • the air may be sucked with a greater suction force. Therefore, the amount of air passing through the sintered raw material can be prevented from decreasing and combustion of the sintered raw material can proceed stably.
  • the quality of the sintered ore generated can be improved.
  • FIG. 1 is a view showing a sintering apparatus according to an embodiment of the present invention.
  • FIG. 2 is a view showing the cross-sectional shape of the cross-sectional phenomenon of the sintered layer and the characteristics of the exhaust gas during the sintering process according to an embodiment of the present invention.
  • FIG. 3 is a view showing a sintering apparatus according to another embodiment of the present invention.
  • FIG. 4 is a view showing a sintering apparatus according to another embodiment of the present invention.
  • FIG. 5 is a view showing a sintering method according to an embodiment of the present invention.
  • FIG. 1 is a view showing a sintering apparatus according to an embodiment of the present invention.
  • the sintering apparatus 100 is disposed to be movable along a movement path, and a trolley 110 in which a sintering raw material is charged therein, and sprays a flame to an upper portion of the sintering raw material.
  • a trolley 110 in which a sintering raw material is charged therein, and sprays a flame to an upper portion of the sintering raw material.
  • the circulation unit 160 is disposed and connected to a portion of the hood 150 and the plurality of windboxes 140 extending along the movement path, and supplies exhaust gas sucked into some of the windboxes 140 to the hood 150.
  • an air supply unit 170 connected to at least one of the hood 150 and the circulation unit 160 to supply air to the sintered raw material.
  • the sintering apparatus 100 is connected to the charging unit 120 for charging the sintering raw material into the trolley 110, the wind box 140 is not connected to the circulation unit 160 of the plurality of wind box 140. It may further include a control unit 190 for controlling the operation of the gas discharge unit 50, and the air supply unit 170, the pressure sensor 181 and the circulation unit 160 for measuring the pressure in the hood 150 At least one of the oxygen sensor 182 for measuring the oxygen concentration of the exhaust gas sucked into).
  • the trolley 110 may be disposed to rotate in a caterpillar manner, and a closed loop may be formed to form a closed loop and a conversion path connecting the movement path on the upper side and the rotation path on the lower side and the movement path and the rotation path.
  • a closed loop may be formed to form a closed loop and a conversion path connecting the movement path on the upper side and the rotation path on the lower side and the movement path and the rotation path.
  • the movement path may be extended in the front and rear direction, the charging section is located in the foremost position of the movement path and the charging unit 120 is disposed, the ignition section located in the rear of the charging section, the ignition path 130, Located in the rear of the ignition section may include a sintering section in which the sintering raw material is sintered. That is, when passing through the charging section, the sintered raw material is charged to the trolley 110, and when passing through the ignition section, the flame is ignited to the raw material in the trolley 110, and the flame complexed to the raw material is the upper part of the sintered raw material. Sintered ore is produced while moving downward from. At this time, the cart 110 may move from the front of the movement path to the rear.
  • the trolley 110 may form a space in which the sintered raw material is accommodated, and a plurality of trolleys may be installed in the endless track to move the movement path and the turn path.
  • the plurality of trolleys 110 may perform the operation of continuously manufacturing the sintered ore while moving from the movement path to the turn path or from the turn path to the travel path.
  • the charging unit 120 is disposed in the charging section of the movement path.
  • the charging unit 120 is positioned above the trolley 110 so as to charge the sintered raw material into the open upper portion of the trolley 110.
  • the charging unit 120 may include a hopper for storing the sintered raw material therein, and a charging chute disposed under the hopper to guide the sintered raw material discharged from the hopper into the trolley 110. Accordingly, the sintered raw material may be charged into the trolley 110 passing through the charging section.
  • the ignition furnace 130 is disposed in the ignition section of the movement path.
  • the ignition furnace 130 is disposed at the rear of the charging unit 120, and serves to inject the flame into the raw material charged in the trolley 110 from the upper side of the trolley 110.
  • the charging raw material in the trolley 110 passing through the ignition section may be ignited.
  • a plurality of windbox 140 is disposed along the movement route, and serves to suck the exhaust gas from the lower portion of the bogie 110 passing through the movement route.
  • air on the upper side of the trolley 110 may be sucked into the windbox 140 through the sintering raw material inside the trolley 110. Therefore, it is possible to sinter the whole sintered raw material while the flame complexed to the upper surface of the sintered raw material moves downward along the air.
  • the gas discharge unit 50 provides suction power to the wind box 140 which is not connected to the circulation unit 160 among the plurality of wind boxes 140, and serves to discharge the sucked exhaust gas to the outside.
  • Gas discharge unit 50 is connected to the lower portion of the wind box 140, the suction pipe 51 having a space for receiving the exhaust gas sucked therein, a dust collector 52 connected to the suction pipe 51, the main blower 53, and chimney 54.
  • the main blower 53 generates a suction force
  • the exhaust gas introduced into the wind box 140 into the suction pipe 51 is sucked, filtered through the dust collector 52 and then discharged to the chimney 54.
  • the exhaust gas may be air sucked into the windbox 140 through the sintered raw material.
  • the circulation unit 160 is connected to some of the plurality of windboxes 140 and serves to circulate the exhaust gas sucked into the upper portion of the truck 110.
  • the circulation unit 160 is connected to a portion of the plurality of windbox 140 and the circulation pipe 161 to form a space for accommodating the exhaust gas therein, and forms a path through which the exhaust gas moves, and one end of the circulation pipe 161.
  • a circulation line 162 connected to the other end and connected to the hood 150, and a blower 163 installed at the circulation line 162.
  • the circulation pipe 161 forms a space in which the exhaust gas is received, and is connected to some of the plurality of wind boxes 140.
  • the circulation pipe 161 is connected to the wind boxes 140 between the point where the flow rate of the exhaust gas increases and decreases and the point where the temperature of the exhaust gas is the maximum.
  • FIG. 2 is a view showing the cross-sectional shape of the cross-sectional phenomenon of the sintered layer and the characteristics of the exhaust gas during the sintering process according to an embodiment of the present invention.
  • the combustion zone is an area where the combustion of the sintered raw material is active and the temperature is high. Referring to Figure 2, the combustion zone is gradually moved downward by the air sucked from the top to the bottom, the top of the combustion zone is cooled by air at room temperature. At this time, since the ventilation resistance of the combustion zone is larger than the raw sintered raw material, when the thickness of the combustion zone increases, the amount of exhaust gas sucked into the windbox 140 decreases. Therefore, the point A where the flow rate of the exhaust gas increases and decreases may be a point at which the ventilation resistance inside the trolley 110 increases (a point where the thickness of the combustion zone increases).
  • the hot air passing through the combustion zone decreases in temperature as it meets the raw sintered raw material under the combustion zone. Water vapor vaporized in the combustion zone condenses to form a wet zone.
  • the combustion zone reaches the bottom of the trolley 110, the wet zone and the unsintered sintered raw material layer disappear. Therefore, the hot air passing through the combustion zone is not cooled while passing through the sintered raw material or the wet zone, which is sucked into the wind box 140 in a high temperature state.
  • the temperature of the exhaust gas sucked into the windbox 140 rises to the maximum temperature, the temperature decreases from the point where the sintering of the sintered raw material is almost completed.
  • the point A at which the flow rate of the exhaust gas increases and decreases is the point where SOx occurs.
  • SOx may react with water in the flue gas to generate sulfuric acid, and may corrode the inside of the circulation pipe 161. Therefore, the high temperature exhaust gas may also be introduced into the circulation pipe 161 so that the temperature inside the circulation pipe 161 is higher than the acid dew point.
  • the internal temperature of the circulation pipe 161 can be increased by connecting the circulation pipe 161 to the wind box 140 at the point where the exhaust gas temperature reaches the maximum.
  • each of the wind box 140 may be provided with a flow rate sensor for measuring the flow rate of the exhaust gas and a temperature sensor for measuring the temperature of the exhaust gas. Therefore, it is possible to know the position of the point where the flow rate of the exhaust gas increases and decreases among the plurality of windboxes 140 and the point where the temperature of the exhaust gas is maximized.
  • the circulation line 162 forms a path through which the exhaust gas moves.
  • One end of the circulation line 162 may be connected to the lower portion of the circulation pipe 161, and the other end thereof may be connected to the upper portion of the hood 150. Therefore, the exhaust gas sucked into the circulation pipe 161 may move along the circulation line 162 and be supplied to the hood 150.
  • the blower 163 is installed in the circulation line 162 and generates a suction force.
  • the exhaust gas may be sucked into the windbox 140, and the exhaust gas sucked into the windbox 140 may be supplied to the hood 150 through the circulation line 162.
  • the blower 163 provides suction power to the wind box 140 connected to the circulation pipe 161 among the plurality of wind boxes 140, and the main blower 140 is connected to the wind box 140 connected to the suction pipe 51. 53) provide suction power.
  • a larger suction force may be provided to each of the windboxes 140 than when the suction force is provided to all of the windboxes 140 with one blower.
  • the number of the wind box 140 connected to the circulation pipe 161 may be less than the number of the wind box 140 connected to the suction pipe 51. Therefore, even if the suction force generated by the blower 163 and the main blower 53 is the same, a larger suction force may be generated in the windboxes 140 connected to the circulation pipe 161. That is, it is possible to suppress or prevent a decrease in the flow rate of the exhaust gas by providing a larger suction force in a region having a high ventilation resistance.
  • the hood 150 is spaced apart from the upper side of the trolley 110 to serve to supply exhaust gas sucked into the circulation pipe 161 as a raw material for sintering in the trolley 110.
  • the hood 150 may extend in the front-rear direction, the upper and side surfaces may be blocked to cover the upper portions of the windboxes 140, and the lower portion may be opened. Therefore, the exhaust gas supplied into the hood 150 may be discharged to the lower portion of the hood 150.
  • the hood 150 is disposed at the rear of the movement path from the top of the wind box 140 at the point where combustion of the lowest layer of the sintered raw material starts (or the point where the combustion zone reaches the bottom of the bogie 110). It may be extended to cover the upper portion of the windbox 140.
  • Flue gas is generated while air passes through the sintered raw material, and the sintered raw material is combusted by oxygen in the air. Therefore, the exhaust gas has a lower oxygen concentration than normal air. When the exhaust gas is supplied to the portion where combustion is most actively performed, the productivity and quality of the sintered ore decrease.
  • the exhaust gas may be supplied to a region where combustion is less likely to circulate the exhaust gas. That is, the hood 150 has a wind box between a point where combustion starts to occur less (or a point where combustion of the lowest layer of sintered raw material starts), and a point where combustion is completely completed (or the rearmost point of the movement path). 140 may be extended to supply exhaust gas.
  • the number of windboxes 140 covered by the hood 150 may be greater than the number of windboxes 140 connected to the circulation pipe 161.
  • the exhaust gas sucked into the circulation pipe 161 is larger in volume than normal air because it is hot. Since the volume of the exhaust gas that the wind box 140 can inhale is limited, if the number of the wind boxes 140 that the hood 150 covers is small (or the area where the hood 150 supplies the exhaust gas decreases) Some of the exhaust gas discharged from the hood 150 may not be sucked into the windbox 140, and may be leaked to the outside to cause environmental pollution.
  • the hood because the exhaust gas discharged from the hood 150 can be sucked into the wind box 140 all
  • the exhaust gas discharged from 150 may be prevented from leaking to the outside.
  • the number of windboxes 140 covered by the hood 150 may be connected to the circulation pipe 161 so that the windbox 140 may suck all the exhaust gas discharged from the hood 150. You can increase the number.
  • the front end position of the hood 150 and the rear end position of the circulation pipe 161 may overlap each other based on the front and rear directions.
  • the air supply unit 170 may include a door unit 171 installed on the hood 150.
  • an opening may be formed in at least a portion of the upper surface of the hood 150, and may be installed in the hood 150 to open and close the opening.
  • the air supplied from the air supply unit 170 may be general air or external air (outside air) that does not pass through the sintered raw material.
  • the opening of the hood 150 may have a rectangular shape
  • the door unit 171 may include a plate covering the opening and a driver for moving the plate.
  • the plate may be formed to correspond to the shape of the opening and is slidably installed in the hood 150.
  • the plate may be installed to be moved back and forth on the upper surface of the hood 150.
  • advancing the plate allows the plate to be positioned corresponding to the opening and to close the opening.
  • the opening can be opened while the plate moves.
  • the structure or shape of the plate and the method of installing the hood 150 may be various.
  • the driver serves to move the plate.
  • the driver may be a cylinder, one end may be connected to the plate and the other end may be fixed to the hood 150. Therefore, when one end of the driver moves forward, the plate may move forward to close the opening of the hood 150, and when one end of the driver moves backward, the plate may move backward to open the opening of the hood 150.
  • the method of moving the plate by the driver is not limited thereto and may vary.
  • the opening is disposed closer to the ignition furnace 130 than the portion connected to the circulation line 162 and the hood 150. That is, the opening is located in front of the connection portion between the circulation line 162 and the hood 150.
  • the opening may be formed before half (or central portion) of the hood 150 and the circulation line 162 may be connected to the portion after half of the hood 150. have. Therefore, air may flow into the windbox 140 located at the front of the windbox 140 covered by the hood 150, and circulating gas may be supplied to the windbox 140 located at the rear.
  • the truck 110 passing through the wind box 140 located in front of the wind box 140 covered by the hood 150 and the truck 110 passing through the wind box 140 located in the rear 110 Combustion is more actively carried out within That is, more oxygen should be supplied to the bogie 110 located in the front.
  • air may be supplied to the front trolley 110 where combustion is more actively performed, and exhaust gas having a smaller amount of oxygen may be supplied to the rear trolley 110.
  • the pressure sensor 181 may be installed in the hood 150.
  • the pressure sensor 181 serves to measure the pressure inside the hood 150.
  • One pressure sensor 181 may be provided to measure pressure at only one position in the hood 150, and a plurality of pressure sensors 181 may be provided to measure pressure at a plurality of positions inside the hood 150.
  • the controller 190 controls 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 the transceiver 191 for transmitting and receiving pressure information in the hood 150, the pressure in the hood 150 connected to the transceiver 191 and enters the transceiver 191 and It may include a determiner 192 for comparing a predetermined set pressure value, and a controller for controlling the operation of the driver in accordance with the determination of the determiner 192.
  • the determiner 192 may compare the pressure inside the hood 150 with the set pressure value and send a signal to the controller to open the opening of the hood 150 when the pressure inside the hood 150 is less than the set pressure value.
  • the set pressure value may be 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. Accordingly, when the opening is opened when the pressure inside the hood 150 is lower than atmospheric pressure, the outside air is introduced into the hood 150 through the opening.
  • the controller closes the opening of the hood 150. That is, when the pressure inside the hood 150 is higher than atmospheric pressure, the gas inside the hood 150 may be discharged to the outside. Thus, the exhaust gas inside the hood 150 may be discharged to the outside to contaminate the environment. Therefore, when the pressure inside the hood 150 is higher than the outside pressure, the opening of the hood 150 may be closed to prevent the exhaust gas inside the hood 150 from flowing out.
  • the set pressure value is not limited thereto and may vary.
  • FIG. 3 is a view showing a sintering apparatus according to another embodiment of the present invention.
  • the air supply unit 170 forms a path through which air moves and controls the supply line 175 connected to the circulation line, and the supply line 175. It may include a valve 176, and may include a cooler (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 may be injected into the other end.
  • air moving along the supply line 175 may be supplied to the circulation line 162, mixed with the exhaust gas moving through the circulation line 162, and supplied to the hood 150.
  • the control valve 176 opens and closes the movement 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.
  • a cooler (not shown) is positioned 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, the exhaust gas moving along the circulation line 162 is bulky because it is a high temperature. Therefore, the cooled air can be supplied to the circulation line 162 to lower the temperature of the hot exhaust gas, and the exhaust gas mixed with the air can be reduced in volume due to the decrease in temperature.
  • An oxygen sensor 182 for measuring the oxygen concentration of the exhaust gas may be installed in the circulation line 162.
  • the oxygen sensor 182 serves to measure the concentration of oxygen passing through the circulation line 162.
  • the controller 190 may adjust the amount of air supplied to the circulation line 162 according to the oxygen concentration in the circulation line 162.
  • the controller 190 is connected to the oxygen sensor 182 to transmit and receive the oxygen concentration information of the exhaust gas 191, connected to the transceiver 191 and the oxygen concentration of the exhaust gas coming into the transceiver 191 and a predetermined set concentration value Comparator 192 to compare, and the controller 193 for controlling the operation of the control valve 176 in accordance with the determination of the determiner 192 may include.
  • the determiner 192 may compare the oxygen concentration of the exhaust gas with a set concentration value and may send a signal to open the control valve 176 to the controller 193 when the oxygen concentration of the exhaust gas is less than or equal to the set concentration value.
  • the set concentration value may be selected from any value between 13 and 16%.
  • the oxygen concentration of the exhaust gas is lower than that of ordinary air. Therefore, the exhaust gas can reduce the combustion efficiency of the sintered raw material as compared with the general air.
  • the set concentration value is not limited thereto and may vary.
  • FIG. 4 is a view showing a sintering apparatus according to another embodiment of the present invention.
  • the air supply unit 170 is a door unit 171 for opening and closing the opening formed in the hood 150, a driver for moving the door unit 171, circulation line ( It may include both a supply line 175 connected to the 162 to supply air, and a control valve 176 to open and close the supply line 175.
  • a pressure sensor 181 may be installed in the hood 150
  • an oxygen sensor 182 may be installed in the circulation line 162 to measure the oxygen concentration of the exhaust gas.
  • the controller 190 controls the operation of the door unit 171 according to the pressure inside the hood 150, and controls the amount of air supplied to the circulation line 162 according to the oxygen concentration in the circulation line 162. I can regulate it.
  • the controller 190 is connected to the pressure sensor 181 and the oxygen sensor 182 is a transceiver 191, transceiver 191 for transmitting and receiving the pressure information and the oxygen concentration information of the exhaust gas inside the hood 150
  • the determiner 192 and the determiner 192 to compare the pressure of the inside of the hood 150 and the concentration of the exhaust gas with the preset pressure and the set concentration, respectively, which are connected to the transceiver 191.
  • it may include a controller 193 for controlling the operation of at least one of the driver and the control valve 176.
  • the determiner 192 compares the pressure inside the hood 150 with the set pressure value and sends a signal to the controller 193 to open the opening of the hood 150 when the pressure inside the hood 150 is less than the set pressure value. Can be. Conversely, if the pressure inside the hood 150 is higher than the set pressure value, the controller 193 closes the opening of the hood 150.
  • the determiner 192 may compare the oxygen concentration of the exhaust gas with a set concentration value and may send a signal to open the control valve 176 to the controller 193 when the oxygen concentration of the exhaust gas is less than or equal to the set concentration value.
  • the opening of the hood 150 may be opened by controlling the operation of the driver. Accordingly, air may flow into the hood 150 to increase the concentration of oxygen supplied to the sintered raw material.
  • FIG. 5 is a view showing a sintering method according to an embodiment of the present invention.
  • the sintering method according to the embodiment of the present invention is a method of manufacturing a sintered ore, a process of charging a sintered raw material into a bogie moving along a movement path (S100), and a flame on the upper surface of the sintered raw material.
  • sintered raw materials are charged in each of the trolleys 110 while sequentially passing the plurality of trolleys 110 under the charging unit 120 to form a raw material layer.
  • the plurality of trucks 110 sequentially pass through the lower side of the ignition furnace 130, the flame is injected from the ignition furnace 130 to ignite the flame on the upper surface of the raw material layer.
  • the trolleys 110 pass through the windbox 140, the flame is moved downward by air sucked from the upper side to the lower side, and the sintered raw material is sintered, and a sintered ore is manufactured.
  • the sintered ore is supplied to a cooler (not shown) and cooled.
  • the air (or exhaust gas) sucked into some of the wind boxes 140 may be supplied to the sintered raw material in the bogie 110 passing through the movement path.
  • the aeration resistance of the sintered raw material in the bogie 110 passing between the point where the flow rate of the flue gas increases and decreases and the point where the temperature of the flue gas is maximum is greater than the aeration resistance of the sintered raw material in the bogie 110 passing the other part. Big. In a large air permeation resistance, the amount of air passing through the sintering raw material is reduced, the sintering may not proceed smoothly.
  • the wind box 140 and the circulation pipe 161 are connected between the point where the flow rate of the exhaust gas increases and decreases and the temperature of the exhaust gas maximum is connected to the circulation pipe 161 through the blower 163.
  • the windboxes 140 connected to the circulation pipe 161 may suck air with a higher suction force.
  • the suction force provided from the blower 163 also increases, so it passes through the sintered raw material. It is possible to minimize the decrease in the air volume of the air. As a result, the sintering of the sintered raw material proceeds smoothly, thereby improving the quality of the sintered ore.
  • the exhaust gas sucked into the circulation pipe 161 is supplied to the hood 150 disposed above the bogie 110 through the circulation line 162.
  • the hood 150 is disposed at the rear of the movement path from the top of the wind box 140 at the point where combustion of the lowest layer of the sintered raw material starts (or the point where the combustion zone reaches the bottom of the trolley 110). It may be extended to cover up to the top. That is, since the oxygen concentration of the exhaust gas is smaller than that of the general air, the hood 150 may supply the exhaust gas to an area where combustion occurs less (or an area where less oxygen is required).
  • the windbox 140 should be disposed at a number sufficient to sufficiently suck the exhaust gas discharged from the hood 150. For example, if the windbox 140 on the lower side does not sufficiently suck the air discharged from the hood 150, air that is not sucked may leak out to contaminate the environment. Therefore, in consideration of the amount of air sucked in connection with the circulation pipe 161, it is necessary to adjust the length of the front and rear direction of the hood 150, or the number of the wind box 140 that the hood 150 covers.
  • the outside air may be supplied to the sintering raw material in the trolley 110 passing through the movement path. Since the exhaust gas has a lower oxygen concentration than ordinary air, the combustion efficiency of the sintered raw material can be reduced. Thus, the air having a higher oxygen concentration than the exhaust gas may be supplied to the sintering raw material together with the exhaust gas to improve the combustion efficiency of the sintering raw material.
  • Air may be directly supplied to the sintered raw material through the hood 150, or may be supplied as a sintered raw material by mixing exhaust gas and air.
  • the operation of the door unit 171 for opening and closing the opening in the hood 150 may be controlled.
  • the pressure inside the hood 150 may be measured.
  • the opening of the hood 150 may be opened.
  • the set pressure value may be 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. Accordingly, when the opening is opened when the pressure inside the hood 150 is lower than atmospheric pressure, the outside air may be introduced into the hood 150 through the opening and supplied as a sintered raw material.
  • the opening of the hood 150 is closed. That is, when the pressure inside the hood 150 is higher than atmospheric pressure, the gas inside the hood 150 may be discharged to the outside. Thus, the exhaust gas inside the hood 150 may be discharged to the outside to contaminate the environment. Therefore, when the pressure inside the hood 150 is higher than the outside pressure, the opening of the hood 150 may be closed to prevent the exhaust gas inside the hood 150 from flowing out.
  • air may be injected from the front end of the hood, and exhaust gas may be injected from the rear end of the hood.
  • the air may be injected in an area before the half point (or the center) of the hood 150 and the exhaust gas may be injected in the area after the half point of the hood 150 based on the front and rear directions. . That is, an opening is formed in an area before the half point of the hood 150, and an area after the half point of the hood 150 is connected to the circulation line 162 to receive exhaust gas.
  • the oxygen concentration of the exhaust gas moving in the circulation line 162 can be measured. Then, the control valve 176 can be opened when the oxygen concentration of the exhaust gas is compared with the set concentration value and the oxygen concentration of the exhaust gas is equal to or less than the set concentration value.
  • the set concentration value may be selected from any value between 13 and 16%.
  • the opening of the hood 150 may also be opened if the oxygen concentration of the exhaust gas is equal to or less than the set concentration value. Accordingly, air may flow into the hood 150 to increase the concentration of oxygen supplied to the sintered raw material.
  • the opening point of the opening is not limited thereto, and may be always open.
  • the exhaust gas generated during the air and the sintering process may be supplied to the sintering raw material to be involved in the sintering process. Therefore, the exhaust gas is circulated and reused to suppress or prevent environmental pollution caused by the exhaust gas.
  • exhaust gas has a lower oxygen concentration than ordinary air
  • combustion efficiency can be reduced. Accordingly, since the air having a high oxygen concentration together with the exhaust gas is supplied to the sintered raw material, it is possible to suppress or prevent the combustion efficiency from decreasing. That is, by supplying air can improve the combustion efficiency of the sintered raw material, the productivity of the sintering process can be increased.
  • the ventilation resistance may increase, thereby reducing the amount of air passing through the sintered raw material.
  • the air may be sucked with a greater suction force. Therefore, the amount of air passing through the sintered raw material can be prevented from decreasing and combustion of the sintered raw material can proceed stably.
  • the quality of the sintered ore generated can be improved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture And Refinement Of Metals (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
PCT/KR2016/013625 2016-03-18 2016-11-24 소결장치 및 소결방법 WO2017159962A1 (ko)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP16894692.9A EP3431909B1 (en) 2016-03-18 2016-11-24 Sintering apparatus and sintering method
JP2018539316A JP6688396B2 (ja) 2016-03-18 2016-11-24 焼結装置及び焼結方法
CN201680083324.3A CN108779960A (zh) 2016-03-18 2016-11-24 烧结设备和烧结方法

Applications Claiming Priority (2)

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KR1020160032765A KR101766672B1 (ko) 2016-03-18 2016-03-18 소결장치 및 소결방법
KR10-2016-0032765 2016-03-18

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CN112725615B (zh) * 2020-12-22 2021-12-24 中冶长天国际工程有限责任公司 一种基于分层复合供热的均热烧结方法
CN112985069B (zh) * 2021-04-09 2022-12-06 江西科技学院 一种多级回转式气氛烧结炉及其烧结工艺

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EP3431909B1 (en) 2020-06-03
EP3431909A4 (en) 2019-01-23
EP3431909A1 (en) 2019-01-23
CN108779960A (zh) 2018-11-09
JP2019508658A (ja) 2019-03-28
KR101766672B1 (ko) 2017-08-09

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