WO2018074783A1 - Système de traitement de gaz d'échappement et procédé de traitement - Google Patents

Système de traitement de gaz d'échappement et procédé de traitement Download PDF

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Publication number
WO2018074783A1
WO2018074783A1 PCT/KR2017/011350 KR2017011350W WO2018074783A1 WO 2018074783 A1 WO2018074783 A1 WO 2018074783A1 KR 2017011350 W KR2017011350 W KR 2017011350W WO 2018074783 A1 WO2018074783 A1 WO 2018074783A1
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WIPO (PCT)
Prior art keywords
region
exhaust
exhaust gas
trolley
circulation
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PCT/KR2017/011350
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English (en)
Korean (ko)
Inventor
박종인
조병국
정은호
Original Assignee
주식회사 포스코
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Application filed by 주식회사 포스코 filed Critical 주식회사 포스코
Priority to EP17862388.0A priority Critical patent/EP3531052A1/fr
Priority to JP2019542336A priority patent/JP2019534951A/ja
Priority to CN201780064145.XA priority patent/CN109844435B/zh
Publication of WO2018074783A1 publication Critical patent/WO2018074783A1/fr

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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
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • 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
    • F27B21/02—Sintering grates or tables
    • 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • F27D17/001—Extraction of waste gases, collection of fumes and hoods used therefor
    • F27D17/002—Details of the installations, e.g. fume conduits or seals
    • 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
    • F27D7/04—Circulating atmospheres by mechanical means
    • 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
    • F27D7/06—Forming or maintaining special atmospheres or vacuum within heating chambers

Definitions

  • the present invention relates to a flue gas treatment apparatus and a treatment method, and more particularly to a flue gas treatment apparatus and treatment method that can suppress or prevent the interference between the flue gas flow due to the negative pressure difference for each section of the facility.
  • Sintered ore is a blast furnace charge made from ferrous ore, limestone, powdered coke and anthracite. In blast furnace operation for the production of molten iron, sinter ore is charged with iron ore and coke into the blast furnace.
  • a sintered ore manufacturing process is a process of sintering fine iron ore to a size suitable for blast furnace use.
  • a sintered ore manufacturing process includes the process of preparing a compounding raw material, and the process of manufacturing a compounding raw material into a sintered ore. Among them, a process of manufacturing the blended raw material into a sintered ore is usually performed in a sintering machine.
  • the process of manufacturing the blended raw material into sintered ore is carried out as follows. While moving the sinter bogie in the extending direction of the sintering machine, charge the compounding raw material to a certain height on the sintering bogie, ignite the surface layer of the compounding raw material to generate a combustion zone, and use the exhaust gas treatment device to air down the sintering bogie. Is forcedly aspirated to move the combustion zone downward and sinter the blended raw materials. Thereafter, the sintered blended raw material such as sintered ore is crushed and cooled through a crusher and a cooler provided in the light distribution section of the sintering machine, classified into a particle size of 5 mm to 50 mm suitable for blast furnace use, and then transferred to the blast furnace.
  • the sensible heat of the flue gas can be recycled to the sinter to reduce the energy required for sintering.
  • four sinters were converted into on-strand cooling sinterers, and the air of the cooling section of the sinter was recycled and used as sintering air.
  • Kita Kyushu and Kashima have also applied the sintered flue gas circulation technology to circulate the flue gas of the cooler to the sinter.
  • NKK installed a second blower to recycle the exhaust gas recovered by the second blower to the light distribution side of the sintering machine in order to increase the suction capacity for the purpose of improving productivity of the Fukuyama 4 sinter.
  • the method of improving the sensible heat recovery of the system was applied.
  • the above cases are examples of applying the sintered flue gas circulation technology to the sintering machine operation for the purpose of reducing the amount of exhaust gas by transferring the sensitized flue gas to the sintered bed or the ignition furnace and for reducing the amount of exhaust gas.
  • NSC's Kitakyushu III sintering in 1992 reduced the amount of exhaust gas by 28% by improving the equipment to minimize the amount of emissions while maintaining productivity and quality.
  • EOS emission Optimized Sintering
  • Application to the Hoogovens sintering plant in the Netherlands reduced emissions by about 40%.
  • a method for increasing the sintered ore there is a method of increasing the blower capacity of the exhaust gas treatment device to increase the amount of sintered air and a method of increasing the amount of sintered air by increasing the image area of the sintering machine. At this time, if the blower capacity of the flue gas treatment device is increased, the structure for cleaning the flue gas must also be increased, and the maintenance cost of the flue gas treatment device is further increased.
  • POSCO's Pohang 4 sintering has expanded the image area of the sintering machine to introduce sintered flue gas circulation technology and to increase the sintered ore in response to the increased demand for sintered ore due to the expansion of the blast furnace contents and the high feed-through ratio operation.
  • a blower for exhaust gas circulation was additionally installed in the exhaust gas treatment device.
  • the added blower was configured to circulate to the rear end of the sintered layer with less oxygen consumption after suctioning the exhaust gas at a high pressure with the portion where the ventilation resistance of the sintered layer is the largest suction position of the exhaust gas.
  • the exhaust gas sucked into the added blower is circulated and supplied to the upper portion of the sintered layer, the total amount of the exhaust gas can be maintained. Therefore, even if the image area of Pohang 4 sinter is increased and a blower is added, the existing structure related to the flue-gas cleaning of the flue-gas treatment apparatus can be used as it is.
  • Patent Document 1 KR10-2002-0014877 A
  • Patent Document 2 KR10-2016-0079240 A
  • Non-Patent Document 1 F.W. Kinsey, Dravo co.,, "Design parameters for strand cooling", AIME, vol. 34, Ironmaking proceeding, p85, (1975)
  • Non-Patent Document 2 D. Schlebusch, F. Cappel, "Optimization of pollution control in sinter plant", 6-th International symposium on agglomeration, p403-408, Nagoya, Japan, (1993)
  • the present invention provides a flue gas treatment apparatus and treatment method that can suppress or prevent the interference between the flow of flue gas due to the negative pressure difference for each section of the facility.
  • the present invention provides a flue gas treatment apparatus and treatment method that can improve the operating efficiency of the facility by suppressing or preventing interference between the flue gas flow of the facility.
  • An exhaust gas treating apparatus has a suction having a circulation region and an exhaust region, which extend along a traveling direction of the trolley at a lower portion of the trolley which moves a plurality of sections and is capable of processing raw materials, and which are distinguished from each other. part; And a blocking part provided at a boundary between the circulation area and the exhaust area so as to seal a gap between the bogie and the suction part.
  • the suction unit includes a plurality of windboxes arranged along a driving direction of the trolley, wherein the plurality of windboxes are connected to upper ends adjacent to each other in a direction in which the suction unit extends, and the blocking unit includes the plurality of windboxes. It may be installed at the upper end portion of the box that is in contact with each other of the wind box contacting the boundary with the boundary between the circulation region and the exhaust region.
  • An interval between an upper surface of the blocking unit and a lower surface of the bogie may be greater than 0 and less than or equal to 100 mm within an error range.
  • An exhaust gas treating apparatus is disposed in a circulation region and an exhaust region separated from each other at a lower portion of a bogie that is capable of processing a raw material while moving a plurality of sections, and is arranged along the running direction of the bogie. And a plurality of windboxes, wherein an upper end of some of the windboxes disposed adjacent to a boundary between the circulation area and the exhaust area may protrude from the upper ends of the other windboxes.
  • the partial windbox may include a first windbox positioned in the circulation region and a second windbox positioned in the exhaust region with the boundary therebetween, and an upper end portion of the first windbox and the second windbox in contact with each other. May be located within a distance of more than 0 and 100 mm or less from the lower surface of the bogie.
  • a blocking part installed at an upper end portion of the first windbox and the second windbox in contact with the bogie to seal the gap between the bogie and the windbox at the boundary.
  • the blocking unit of the exhaust gas treatment device according to the embodiments of the present invention, the blocking unit body extending in a direction crossing the running direction of the bogie; And a flap protruding from the body of the blocking part in the traveling direction of the vehicle.
  • the flap may be formed above or below the blocking body, or between the upper and lower portions of the blocking body.
  • the flap may be located in at least one of the circulation zone and the exhaust zone.
  • the flap may be located in a region having a lower negative pressure among the circulation region and the exhaust region.
  • the blocking unit may further include at least one rib protruding from the upper surface of the flap.
  • the rib may extend in a direction crossing the traveling direction of the trolley or the traveling direction of the trolley. When a plurality of the ribs are formed, some of the plurality of ribs may extend in a traveling direction of the trolley, and the rest of the plurality of ribs may extend in a direction crossing the traveling direction of the trolley.
  • the blocking part may further include a tip protruding downward from the end of the flap in a direction from the blocking body toward the end of the flap.
  • the cross-sectional width of the upper end of the wind box facing the flap is 1, the total protruding length of the flap and the tip in the traveling direction of the bogie may be greater than 0 and less than 2/3.
  • Exhaust gas treatment method the step of charging the raw material into the bogie to move a plurality of sections and heat treatment; Sucking the inside of the trolley by using a suction unit which extends along a running direction of the trolley and has a circulation zone and an exhaust zone that are separated from each other under the trolley; And suppressing backflow of the exhaust gas of the region having a lower negative pressure among the circulation region and the exhaust region to the gap side between the bogie and the suction part.
  • the upper side of the plurality of wind boxes arranged in the running direction of the bogie in the bottom of the bogies, the upper side of the some wind box in contact with each other with the boundary of the exhaust gas circulation region and the exhaust zone in between Install a block at the end.
  • the exhaust gas is discharged between the bogie and the windbox by using the cut-off part in the circulation zone of the flue gas and the region with the low negative pressure. The flow back to the gap side can be suppressed or prevented from flowing into a region having a large negative pressure.
  • the blocking portion may be further provided at the upper end of the above-mentioned some windboxes in contact with each other.
  • the windbox on the side of the circulating region of the exhaust gas and the exhaust region is in contact with each other and the exhaust gas flow of the windbox on the edge of the circulating region of the exhaust gas interferes with each other, and the windbox on the side with the lower negative pressure is relatively smaller. It is possible to suppress or prevent the occurrence of reverse flow of flue gas in the reactor.
  • the efficiency of both the circulating flow and the exhaust flow of the exhaust gas can be improved, and the overall exhaust gas flow rate can be improved.
  • the efficiency of sintered ore manufacturing operation can be improved, and high-quality sintered ore can be manufactured.
  • FIG. 1 is a schematic diagram of a raw material processing facility according to an embodiment of the present invention.
  • Figure 2 is a schematic diagram showing an exhaust gas treatment apparatus according to an embodiment of the present invention.
  • FIG 3 is a schematic view of a blocking unit according to a first modified example of the embodiment of the present invention.
  • FIG 4 is a schematic view of a blocking unit according to a second modified example of the embodiment of the present invention.
  • FIG 5 is a schematic view of a blocking unit according to a third modified example of the embodiment of the present invention.
  • FIG. 6 is a schematic view of a blocking unit according to a fourth modified example of the embodiment of the present invention.
  • FIG. 7 is a schematic view of a blocking unit according to a fifth modified example of the embodiment of the present invention.
  • FIG. 8 is a schematic diagram of an exhaust gas flow in a suction unit according to a comparative example of the present invention.
  • FIG. 9 is a graph showing the results of numerical analysis of the exhaust gas flow in the suction unit according to the comparative example and the embodiment of the present invention.
  • FIG. 11 is a table illustrating a result of a reduced modeling experiment on a flue gas flow in a suction unit according to a comparative example and an embodiment of the present invention.
  • 'top' and 'bottom' refer to the upper part and the lower part, respectively, as part of a component.
  • 'top' and 'below' refer to a space in which the upper and lower parts of the component directly and in direct contact with each other act.
  • the present invention relates to a flue gas treatment apparatus and method that can suppress or prevent the occurrence of flow interference between the circulated and exhaust flow in the flue gas flow of the sintering machine by the negative pressure difference for each section of the equipment, for example, the negative pressure difference between the windboxes. It is about.
  • the embodiment will be described in detail based on the sintered ore manufacturing operation of the steel mill.
  • the present invention can also be utilized to control the flue gas flow of various treatment facilities.
  • FIG. 1 is a schematic diagram of a raw material processing facility to which the flue gas treatment apparatus according to an embodiment of the present invention is applied
  • FIG. 2 is a schematic view showing a suction unit and a blocking unit of the flue gas treatment apparatus according to an embodiment of the present invention.
  • 3 to 7 are schematic views illustrating various modifications of the blocking unit according to the exemplary embodiment of the present invention.
  • 3 is a schematic diagram of a blocking unit according to a first modified example of the embodiment of the present invention
  • FIG. 4 is a schematic diagram of a blocking unit according to a second modified example of the embodiment of the present invention
  • FIG. 5 is a third diagram of an embodiment of the present invention.
  • 6 is a schematic view of a blocking unit according to a modification
  • FIG. 6 is a schematic view of a blocking unit according to a fourth modification of the embodiment of the present invention
  • FIG. 7 is a schematic view of a blocking unit according to a fifth modification of the embodiment of the present invention.
  • a raw material processing facility includes a bogie 10, a raw material hopper 21, an upper light hopper 22, an ignition furnace 30, and an exhaust gas treatment device 400. do.
  • the raw material processing facility may be, for example, a sintering machine capable of circulating at least a portion of the exhaust gas generated in the plurality of sections while being able to heat the raw materials by charging the raw materials in order.
  • a sintering machine capable of circulating at least a portion of the exhaust gas generated in the plurality of sections while being able to heat the raw materials by charging the raw materials in order.
  • it may be a downward suction sintering machine having an exhaust gas circulation structure.
  • the truck 10 may be installed to process a raw material while moving a plurality of sections.
  • the trolley 10 may be provided in plural and may be continuously arranged in the extending direction of the raw material processing facility and may be coupled to each other, and the plurality of sections may be installed to travel in the direction in which the plurality of sections are arranged.
  • the trolley 10 may be opened to an upper side thereof, and a space in which raw materials are loaded and heat treated is formed in the space therein.
  • the raw material may be charged in the inside of the cart 10.
  • the trolley 10 may be provided with a grate bar on a lower surface of the bottom 11, for example, in a lattice structure, and may communicate with a wind box, which will be described later, by the lattice structure. It can be sucked downward by the windbox.
  • the trolley 10 may form a conveying path on the upper side, and may form a conveying path on the lower side.
  • the trolley 10 travels in one direction along the conveyance path, heat-processes the raw material loaded therein in one direction, and distributes the sintered ore which has been heat-treated to the crushing unit (not shown) while entering the return path.
  • the return path may be rotated by traveling the return path in one direction opposite to the one direction.
  • the transport path may include a plurality of sections.
  • the plurality of sections include a charging section in which the raw material hopper 21 and the upper light hopper 22 are positioned, an ignition section in which the ignition furnace 30 is located, and a sintering section located on the opposite side of the charging section, centering on the ignition section. And, based on the direction in which the raw material may be continuously arranged in the order of charging section, ignition section and sintering section.
  • the charging section may be located at an upstream side of the transport path, which is one edge that is relatively preceded with respect to the direction in which the raw material moves among the two edges of the transport path.
  • the raw material is loaded in the trolley 10 to form a raw material layer in the trolley 10.
  • the ignition section may be provided extending in the movement direction of the raw material on the downstream side of the charging section that follows the charging section relative to the direction in which the raw material moves.
  • an upper portion hereinafter referred to as an upper layer
  • the sintering section is a section for sintering and cooling the raw material layer while moving the combustion zone formed in the upper layer loaded on the bogie 10 to the lower part of the raw material layer (hereinafter referred to as 'lower layer'), and igniting with respect to the direction in which the raw material moves. It can be located relative to the interval.
  • the bogie 10 may be heat-treated while moving the raw materials in the order of the charging section, the ignition section, and the sintering section to manufacture the sintered ore.
  • the raw material hopper 21 is a hopper in which raw materials are stored, and is located on one side, for example, a charging section, on the trolley 10.
  • the raw material hopper 21 may be provided with a charging chute and a drum feeder in the lower opening, and may be charged by vertically segregating the raw material in the trolley 10.
  • the raw material may include a blended raw material for producing sintered ore.
  • the raw material may be prepared by mixing and humidifying the iron source, the subsidiary material, and the solid fuel, and then granulating the granular material to the order of several mm.
  • the iron source is an iron source having an iron component, and may include iron ore and iron ore
  • the secondary raw material may include limestone as a secondary raw material containing calcium carbonate
  • the solid fuel may be fine coal coke and anthracite as a coal-based solid fuel. It may include.
  • the upper light hopper 22 may be provided on the upstream side of the charging section ahead of the raw material hopper 21 in the moving direction of the raw material.
  • the upper light may be provided by selectively sintering ore having a particle size of, for example, 8 mm to 15 mm in the sintered ore.
  • the upper light is charged in the inside of the trolley 10 before the raw material, and serves to prevent the raw material from adhering to the bottom of the trolley 10 or the raw material is lost to the gap of the bottom 11.
  • the ignition furnace 30 may be located on the trolley 10 spaced apart in the direction in which the trolley 10 travels in the raw material hopper 21, for example, on one side on the trolley 10 where the raw material hopper 21 is located.
  • the trolley 10 may be positioned on the ignition section of the transport path spaced apart by a predetermined distance in the traveling direction.
  • the ignition furnace 30 may be formed so as to spray the flame downward, and serves to ignite by applying a flame to the upper layer. At this time, the flame may be complexed to the solid fuel contained in the upper layer.
  • Exhaust gas treatment apparatus 400 according to an embodiment of the present invention a plurality of sections at least a portion of the exhaust gas sucked to the lower side of the bogie 10 while sucking the inside of the bogie 10 for processing the raw material moving a plurality of sections It can be formed to circulate in.
  • the exhaust gas treating apparatus 400 may include a suction unit, a blocking unit 413, an exhaust pipe 420, an exhaust gas circulation unit, and an exhaust gas exhaust unit.
  • the suction unit may extend along the driving direction of the trolley 10 under the trolley 10.
  • the suction unit may extend in the driving direction of the trolley 10 while surrounding the lower portion of the trolley 10.
  • the suction unit may include a plurality of windboxes 410 arranged along the driving direction of the trolley 10.
  • the plurality of windboxes 410 may be connected to upper ends adjacent to each other in the direction in which the suction unit extends.
  • the plurality of windboxes 410 communicate with the inside of the bogie 10 through the bottom 11 of the bogie 10, and form a negative pressure therein to suck the inside of the bogie 10 downward, thereby allowing the inside of the raw material layer to be absorbed.
  • the combustion zone can be moved from the upper layer to the lower layer to sinter the raw material. In the above-described process, the exhaust gas is collected in the plurality of windboxes 410.
  • the trolley 10 passing through the ignition furnace 30 passes through the suction part while traveling in one direction.
  • a suction force in the downward direction is generated inside the trolley 10 by the suction portion.
  • the combustion zone is moved downward while outside air on the trolley 10 is sucked downward while passing through the inside of the trolley 10.
  • the trolley 10 passes one point in the sintering section, the combustion zone reaches the bottom 11 of the trolley 10 to complete the sintering of the raw material layer, and then the trolley 10 moves to the end point of the transfer path. While the sintered ore is cooled, the light may be distributed in the light distribution unit provided at the end point of the transport path.
  • the plurality of windboxes 410 are spaced apart from the bottom 11 of the trolley 10 by a predetermined gap to prevent collision with the trolley 10 while sucking the inside of the moving trolley 10 downward.
  • the plurality of windboxes 410 may include the bottom 11 of the trolley 10. Spaced apart). That is, the plurality of windboxes 410 have a structure in which upper ends adjacent to each other and in contact with each other are spaced apart from the bottom 11 of the trolley 10 by a predetermined interval.
  • the suction unit may have a circulation region and an exhaust region that are separated from each other, and the plurality of wind boxes 410 may include the wind boxes 411 disposed in the circulation region and the wind boxes 412 disposed in the exhaust region. It can be divided into.
  • the circulation region may be an inner region of the suction part that contacts the point from one point in the sintering section to another point in the sintering section.
  • one point in the sintering section described above may include a point at which the combustion zone in the raw material layer reaches the bottom 11 of the trolley 10 so that the sintering of the raw material layer is completed.
  • the other point in the aforementioned sintering section may include another point at which the airflow resistance value of the sintered raw material layer starts to be lower than a predetermined value.
  • the exhaust region may include an inner region of the suction portion that contacts the point from which the transfer path starts to one point in the above-described sintering section, and an inner region of the suction portion that contacts the other point within the above-mentioned sintering section to the point where the transfer path ends. Can be. That is, the exhaust region may be the remaining region in the suction portion except the circulation region.
  • the sintering section may be divided in various ways according to the needs of the operation.
  • the above-described separation of the circulating region and the exhaust region illustrates one of several methods of circulating the exhaust gas.
  • the circulating region and the exhaust region may be variously selected and distinguished from each other. Can be circulated.
  • the vent pipe 420 may be provided in plural and spaced apart in a direction in which the suction part extends to communicate with the lower part of the suction part, and in detail, may be mounted through the lower parts of the plurality of wind boxes 410.
  • the vent pipe 420 may be divided into the vent pipes 421 mounted to the wind boxes 411 disposed in the circulation area and the vent pipes 422 mounted to the wind boxes 412 disposed in the exhaust area. .
  • the exhaust gas circulation part may be connected to the vent pipes 421 mounted at one side of the plurality of vent pipes 420, for example, the wind boxes 411 of the circulation area, and the other side may be opened at a predetermined position on the plurality of sections.
  • the exhaust gas circulation unit may circulate the exhaust gas sucked in the portion where the airflow resistance of the sintered raw material layer is greatest to a predetermined position on the plurality of sections.
  • the other side of the exhaust gas circulation portion may be opened between the above-mentioned one point of the sintering section and the end point of the transfer path, it may be opened on the downstream side rather than the above-mentioned one point of the sintering section.
  • the other side of the exhaust gas circulation portion may be opened at various positions on the plurality of sections in addition to the positions described above.
  • a description will be given with reference to the structure of the exhaust gas circulation unit for circulating the exhaust gas sucked in the portion where the airflow resistance of the sintered raw material layer is the largest on the downstream side of the sintering section.
  • the exhaust gas circulation unit may include a circulation pipe 430, a circulation blower 451, and a hood 460.
  • the circulation pipe 430 has a passage therein, one end of which is connected to the vent pipes 421 mounted to the wind boxes 411 of the circulation region in contact with a portion of the sintered raw material layer having a large ventilation resistance. May be connected to the hood 460.
  • the circulating blower 451 is, for example, a blower for exhaust gas circulation, and is mounted on one side of the circulation pipe 430 to form a flow of exhaust gas from one end of the circulation pipe 430 toward the other end. By this flow, the exhaust gas circulation flow may be formed in the windboxes 411 of the circulation region.
  • the hood 460 may extend on the trolley 10 in the traveling direction of the trolley 10, and may be extended between the end points of the transfer paths at one point of the sintering section.
  • the hood 460 may be opened downward to face the trolley 10 and communicate with the other end of the circulation pipe 430.
  • the hood 460 may receive the exhaust gas from the circulation pipe 430 and circulate while supplying it to the bogie 10.
  • vent pipes 422 not connected to the exhaust gas circulation part of the plurality of vent pipes 420 may be connected to the exhaust gas exhaust part. Flue gas collected in the windboxes 412 in the exhaust area may be exhausted to the atmosphere through the exhaust gas exhaust.
  • the exhaust gas exhaust part may be connected to the vent pipes 422 mounted on one side of the plurality of vent pipes 420, for example, the wind boxes 412 of the exhaust area, and the other side thereof may be opened in the atmosphere.
  • the exhaust gas exhaust may exhaust the exhaust gas collected in the windboxes 412 of the exhaust region.
  • the exhaust gas exhaust unit may include an exhaust chamber 440, a dust collector 470, a main blower 452, and an exhaust port 480.
  • the exhaust chamber 440 may have a passage therein, one end of which may be connected to the vent pipes 422 mounted to the windboxes 412 of the exhaust area, and the other end thereof may be connected to the exhaust port 480.
  • the main blower 452 is, for example, a blower for exhaust gas exhaust, which is mounted at one side of the exhaust chamber 440 to form a flow of exhaust gas from one end of the exhaust chamber 440 toward the other end. By this flow, an exhaust gas exhaust stream may be formed in the windboxes 412 of the exhaust region.
  • the exhaust gas contains pollutants such as dust, nitrogen oxides and sulfur oxides
  • the dust collector 470 is provided on the other side of the exhaust chamber 440 preceding the main blower 452 in the exhaust gas flow direction to filter the pollutants. Is installed.
  • a crushing unit (not shown) is provided at the downstream end of the sintering section.
  • the sintered ore distributed in the trolley 10 may be crushed to a predetermined particle size in the crushing unit, and then sorted in a screen (not shown), and may be supplied to another process such as blast furnace operation, used as top light, or reused as a raw material according to the particle size.
  • the main blower 452 and the circulation blower 451 have different suction positions and suction areas. That is, the main blower 452 and the circulating blower 451 are different from the position and number of the wind box to be sucked.
  • the air permeability of the raw material layer in) is also different. Due to these differences, the working pressure of the main blower 452 and the circulation blower 451 is different.
  • the negative pressure applied by the main blower 452 to the windboxes 412 of the exhaust area and the negative pressure applied by the circulation blower 451 to the windboxes 411 of the circulation area are different,
  • the amount of flue gas is also different.
  • the magnitude of the negative pressure applied by the circulation blower 451 to the windboxes 411 of the circulation area may be greater than the magnitude of the negative pressure applied by the main blower 452 to the windboxes 412 of the exhaust area. Of course, this may be applied oppositely. In other words, the negative pressure in the exhaust region may be greater.
  • the exhaust gas in the region having a low negative pressure may flow back to the region having a high negative pressure. That is, interference between the exhaust gas flows at the boundary between the circulation region and the exhaust region where the negative pressures are different may cause reverse flow of the exhaust gas toward the higher negative pressure.
  • the reversed flue gas may be introduced into a region having a high negative pressure through a gap between the bottom 11 of the bogie 10 and the suction part.
  • a blocking part at the boundary between the circulation area and the exhaust area. 413 can be provided to seal the gap between the trolley 10 and the suction part.
  • the blocking unit 413 may extend in a direction intersecting the travel direction of the trolley 10 to form a block shape, for example.
  • the blocking unit 413 may be installed at upper ends of the plurality of windboxes 410 that are in contact with each other of the windboxes that contact the boundary with the boundary between the circulation area and the exhaust area interposed therebetween.
  • the interval between the upper surface of the blocking portion 413 and the lower surface of the cart 10 may be greater than 0 and less than or equal to 100 mm within an error range.
  • the error range may be a mechanical or electronic error range of the measuring means, and the structural collision between them in consideration of structural deformation of the bottom 11 and the blocking portion 413 of the bogie 10. It can mean the least amount of play that can be prevented.
  • the blocking portion 413 may narrow the gap between the bottom 11 of the bogie 10 and the upper end of the windbox at the boundary between the exhaust and circulation regions. That is, the effect that the above-mentioned gap is sealed by the blocking part 413 can be achieved, and therefore, it can prevent that a flow outflows from the low side to the high side. And in the remaining positions without the blocking portion 413, the exhaust gas can freely enter and exit through the gap between the bottom 11 of the bogie 10 and the upper end of the wind box, thereby allowing the exhaust gas in each of the exhaust and circulation regions. Aspiration can be formed stably.
  • the blocking unit 413 according to an embodiment of the present invention can be implemented in various forms, including the following modifications.
  • the blocking part 413A according to the first modified example of the embodiment of the present invention includes a blocking part body 413 ′ and a bogie 10 extending in a direction crossing the traveling direction of the bogie 10. It may include a flap 414 of the plate or wing shape protruding to the blocking body 413 'in the driving direction of the. In this case, the flap 414 may be formed on the blocking body 413 ′.
  • the flap 414 forms a flow blocking surface on the windbox in which the flap 414 is located, thereby directly preventing the exhaust gas from flowing backward from the exhaust region on the lower side of the negative pressure to the circulation region on the side of the higher negative pressure. That is, the flap 414 has a significant meaning in terms of hydrodynamics, which will be described below when numerically analyzing the exhaust gas flow inside the suction unit according to the embodiment of the present invention and the comparative example and explaining the result. do.
  • the flap 414 receives the raw material falling through the bottom 11 of the trolley 10 to the upper surface to further narrow the gap between the trolley and the suction portion, thereby more effectively forming a boundary between the exhaust region and the circulation region. You can also seal.
  • the blocking portion 413C according to the third modified example of the embodiment may have a different height between the blocking portion 413A and the flap 414 according to the first modified example. That is, the blocking part 413C according to the third modification includes the blocking part body 413 ′ extending in the direction crossing the traveling direction of the trolley 10 and the blocking body 413 in the traveling direction of the trolley 10. It may include a flap 414 of the plate or wing shape protruding from the bottom of ').
  • the flap 414 is formed on top or bottom of the blocking body 413 'or, although not shown in the figures, varying heights between the top and bottom of the blocking body 413'. Can be formed on.
  • the flap 414 may be located in at least one of the circulation area and the exhaust area, and in this case, the flap 414 may be located in the area where the negative pressure is smaller.
  • the flap 414 can be located in the area
  • the blocking part 413B according to the second modified example of the present invention may include a pair of flaps 414 positioned in both the circulation region and the exhaust region. That is, the blocking unit 413B according to the second modification includes a blocking unit body 413 ′ extending in a direction crossing the traveling direction of the trolley 10, and a blocking unit body 413 in the traveling direction of the trolley 10. And a pair of flaps 414, which are protruded to a), are located in both the circulation zone and the exhaust zone, and have a plate or wing shape.
  • the embodiment of the present invention may further have various modified examples including a flap 414 located only in a region having a greater negative pressure among the circulation region and the exhaust region in addition to the above-described modified examples.
  • the flap 414 according to the modified examples of the present invention may be located in at least one of the circulation region and the exhaust region.
  • the protruding length of the flap when the cross-sectional width of the upper end of the windbox facing the flap 414 is 1, the protruding length of the flap may be greater than 0 and less than 2/3.
  • the protruding length of the flap 414 exceeds 2/3 with respect to the cross-sectional width 1 of the upper end of the windbox facing the flap 414, the effect of preventing backflow of the exhaust gas increases, but the wind facing the flap 414 This is because the flue gas flow that has to flow into the box may deteriorate.
  • the blocking part 413D according to the fourth modification of the present invention may further include at least one rib 415 protruding from the top surface of the flap 414. That is, the blocking part 413D which concerns on the 4th modification of this invention is the blocking part body 413 'extended in the direction which cross
  • a flap 414 protruding from the 413 ′, and at least one rib 415 protruding from the upper surface of the flap 414 may be included.
  • the flap 414 is disposed in the exhaust area, and is shown as a structure that protrudes from the lower portion of the blocking body 413 ', in addition, the flap 414 according to the fourth modification of the present invention It may be arranged in the circulation zone or in the exhaust zone and the circulation zone, respectively. In addition, the above-described flap 414 may be formed to protrude at various positions, including the upper and lower portions of the blocking body 413 'and therebetween.
  • a plurality of ribs 415 may be formed to extend in a direction crossing the traveling direction of the trolley or the traveling direction of the trolley. At this time, the plurality of ribs 415 may be partially extended in the traveling direction of the trolley, and the remaining portions may extend in the direction crossing the traveling direction of the trolley to form a lattice structure. By using this structure, the raw material falling on the upper surface of the flap 414 can be used to suppress or prevent backflow of the exhaust gas.
  • the rib 415 described above may suppress the exhaust gas from being biased from the low pressure side to the high pressure side while acting as a resistance to the flow of the exhaust gas flowing through the upper surface of the flap 414.
  • the blocking portion 414E protrudes downward from the blocking body 413 ′ to the end of the flap 414 in a direction toward the end of the flap 414.
  • a tip 416 may be further formed. That is, the blocking portion 414E is a flap protruding from the blocking body 413 'extending in the direction crossing the traveling direction of the trolley 10 and the blocking body 413' in the traveling direction of the trolley 10. 414, the blocking body 413 ′ may include a tip 416 protruding downward from the end of the flap 414 in a direction toward the end of the flap 414.
  • the tip 461 may prevent the collision with the bottom 11 of the trolley while smoothly securing the flow blocking area of the wind box under the flap 414.
  • the cross-sectional width of the upper end of the windbox facing the flap 414 is 1, the total protruding length of the flap 414 and tip 416 in the travel direction of the bogie may be greater than 0 and less than 2/3.
  • the structure of the blocking unit according to the above-described modifications may be variously modified by being crossed or combined with each other.
  • the structure of the suction unit may be modified as follows.
  • the plurality of windboxes provided in the exhaust gas treatment device are arranged in a circulation area and an exhaust area separated from each other at a lower part of a bogie that is capable of processing raw materials while moving a plurality of sections, and are arranged along a running direction of the bogie.
  • an upper end portion of some of the wind boxes disposed adjacent to the boundary between the circulation area and the exhaust area among the plurality of wind boxes may protrude upward from the upper ends of the other wind boxes.
  • some windboxes include a first windbox positioned in the circulation region and a second windbox positioned in the exhaust region with the boundary between the exhaust region and the circulation region interposed therebetween.
  • the upper end that abuts may protrude upward to be located within a distance of greater than 0 and 100 mm or less from the bottom of the bogie.
  • the gap between the bogie and the windbox at the boundary between the exhaust zone and the circulation zone is sealed.
  • a windshield may be provided at the upper end of the windbox.
  • the configuration and manner of the blocking unit may be the same or similar to the configuration and manner of the blocking unit according to the embodiment of the present invention, and the remaining components of the exhaust gas treatment device may be similar or the same as the configuration of the embodiment.
  • the blocking unit according to the second embodiment of the present invention may be implemented in various forms including various modifications.
  • the configuration and method of the blocking unit of the modified example of the second embodiment of the present invention may be the same or similar to the configuration and method of the blocking unit according to the modified examples of the embodiment of the present invention described above.
  • FIG 8 is a schematic view showing the exhaust gas flow inside the suction unit according to a comparative example of the present invention. At this time, there is no structure of the blocking portion in the suction portion according to the comparative example of the present invention, and the gap between the suction portion and the bogie exceeds 100 mm, for example, as in the prior art.
  • exhaust gas may flow back at a boundary between an exhaust region and a circulation region.
  • a part of the exhaust gas passing through the raw material layer may also be biased into the circulation region on the high negative pressure side.
  • the exhaust gas suction amount of the main blower connected to the exhaust region is reduced, resulting in a decrease in operating efficiency. Can be.
  • the conventional sintering machine has a gap sufficient for the exhaust gas to move between the windbox and the bogie as shown in FIG. If the sinter exhaust gas circulation technology is applied to the sinter of this structure and the image area of the sinter is enlarged, an additional blower must be installed instead of a single blower. When a plurality of blowers are added and operated in this way, the exhaust gas flows back into the above-described gap, thereby reducing the efficiency of the exhaust gas treatment. In a sintering machine using a plurality of blowers, there is no exhaust gas movement between windboxes connected to different blowers, so that the exhaust gas treatment can be effectively performed.
  • Embodiments of the present invention and modifications thereof can efficiently treat the exhaust gas in a structure using two or more blowers using the blocking unit.
  • the blocking unit according to an embodiment of the present invention, in the case of the comparative example and the embodiment of the present invention will be numerically analyzed for the exhaust gas flow in the suction unit and the result will be described.
  • FIG. 9 is a graph showing the results of numerical analysis of the exhaust gas flow in the suction unit according to the comparative example and the embodiment of the present invention.
  • FIG. 9 (a) is a result of numerical analysis of the internal exhaust gas flow in the suction section at the boundary between the exhaust region and the circulation region according to the comparative example of the present invention
  • FIG. 9 (b) shows the exhaust gas according to the embodiment of the present invention.
  • FIG. 9C shows a blocking body having one flap and a blocking body according to the first modification of the modified examples of the present invention.
  • (a) to (c) of FIG. 9 are flow analysis results obtained by calculating flue gas flow changes depending on the presence of the blocking body and the flap.
  • the pressure difference between the main blower and the circulating blower was 200 mmAq, and the flue gas flow change was analyzed under the condition that the circulating blower had a higher negative pressure.
  • the exhaust gas in the exhaust region flows backward and is forced into the circulation region. You can check it.
  • the cutoff portion should be spaced apart from the lower surface of the trolley by a predetermined interval, and the flow of exhaust gas on the cutoff portion biased from the inside of the raw material layer may flow into the circulation region side through the top surface of the cutoff portion.
  • the flap of the exhaust gas on the blocking portion is unbiased by using the structure of the flap. Separated and flowed well.
  • the blocking unit according to the modified examples of the present invention may further include a flap to more effectively suppress the backflow of the exhaust gas.
  • the flap of the blocking portion or the modified example of the embodiment interferes with the flow of the exhaust gas, the change in the exhaust gas amount in the structure of the blocking body and the flap through the reduced model experiment was measured.
  • FIG. 10 is a photograph of a result of a reduced modeling experiment on the exhaust gas flow in the suction unit according to the comparative example and the embodiment of the present invention.
  • (A) of FIG. 10 is a result of a reduced modeling experiment on the structure of the comparative example of the present invention
  • FIG. 10 (b) is a result of a reduced modeling experiment according to an embodiment of the present invention
  • FIG. It is a result of a reduced modeling experiment for the blocking part having one flap according to the first modified example of the modified examples of the present invention.
  • the extension length of the flap was experimented to be 2/3 based on the cross-sectional width 1 of the upper end of the windbox.
  • the reduction modeling experiment for example, a model in which the aspirator internal structure corresponding to the comparative example, the embodiment, and the modification of the present invention is geometrically reduced may be prepared, and the sintering conditions of the sintering machine may be used in various ways. As such, specific descriptions are omitted.
  • FIG. 11 is a table illustrating a result of a reduced modeling experiment on an exhaust gas flow in a suction unit according to a comparative example and an embodiment of the present disclosure.
  • the comparative example is a result of the reduced modeling experiment on the structure of the comparative example of the present invention
  • Example 1 is the result of the reduced modeling experiment according to the embodiment of the present invention
  • Example 2 is the first of the modified examples of the present invention. This is the result of a reduced modeling experiment on a breaker body having a breaker body and one flap of the first modified example.
  • Example 1 Based on the results of the comparative example, it can be seen from Example 1 that the flow rate of the flue gas was well maintained in Example 1 having a structure with a blocking part, and the flow rate of flue gas flowing into the circulation region in Example 2 having a flap was 12. % Increase, and the total flow rate increased by 11%. That is, it can be confirmed that the flow rate of the exhaust gas can be maintained while suppressing the flow interference in the structure with the blocking portion, and it can be confirmed that the suppression of the flow interference and the increase of the exhaust gas flow rate can be achieved in the structure having the blocking portion with the flap.
  • the reason why the total exhaust gas flow rate and the exhaust gas flow rate of the circulation region increase together is as follows. As the flow interference between the exhaust region and the circulation region is effectively suppressed or prevented by the flap, exhaust gas can be sufficiently sucked in the raw material layer on the circulation region having a relatively high ventilation resistance.
  • the negative pressure in the circulation region can act on all or most of the raw material layer on the circulation region with a large ventilation resistance without interfering with the exhaust region, thereby increasing the exhaust gas flow rate in the circulation region and smoothly exhaust gas in the exhaust region. Since it can be aspirated, the flow rate of the exhaust gas can increase before.
  • Exhaust gas treatment method the process of heat-treating and moving a plurality of sections by loading the raw material into the bogie, the process of sucking the inside of the bogie by using the suction unit, the negative pressure of the circulation zone and the exhaust zone is smaller And suppressing back flow of the flue gas in the region to the gap side between the bogie and the suction part.
  • the process of suppressing the backward flow of the exhaust gas of the region having the lower negative pressure among the circulation region and the exhaust region to the gap side between the bogie and the suction portion in more detail, using a blocking portion provided at the boundary between the circulation region and the exhaust region.
  • the exhaust gas of the region having a lower negative pressure among the circulation region and the exhaust region may be prevented from flowing back to the gap side between the bogie and the suction part.
  • raw materials are prepared in a raw material hopper.
  • the raw material may be prepared by mixing and humidifying the iron ore, limestone, powdered coke and anthracite, assembling them to a few millimeters of particle size, and charging them into the raw material hopper.
  • the sintered ore having a predetermined particle size may be screened with the upper light, and charged into the upper light hopper to prepare.
  • the raw material is charged to the trolley and heat treated while moving a plurality of sections.
  • This process includes a process of driving a trolley in a direction in which a plurality of sections are arranged, a process of charging raw materials into a trolley using a raw material hopper; Ignition of the raw material in the ignition furnace to form a combustion zone in the inside of the bogie, it may include the step of sintering the raw material while moving the combustion zone from the top of the bogie to the bottom.
  • the upper light is input to the bottom of the bogie in the charging section of the plurality of sections while driving the bogie along the transport path in the direction in which the plurality of sections are arranged,
  • the raw material is added to the upper surface of the upper light to form a raw material layer.
  • the raw material layer When the raw material layer is formed, the raw material layer is moved in the order of the ignition period and the sintering period, and in the ignition period, the raw material layer is ignited to form a combustion zone, and in the sintering period, about 1300 while the combustion zone is moved from the upper layer to the lower layer of the raw material layer.
  • the raw material layer is heat treated at a high temperature of 1 ° C. to 1400 ° C. and sintered into sintered ore.
  • the inside of the trolley is sucked by using the suction unit, a part of the exhaust gas being sucked is circulated to the trolley and the rest is exhausted.
  • the suction unit extends along the running direction of the bogie to the lower portion of the bogie, and has a circulating region and an exhaust region which are separated from each other, may be the above-described suction unit of the exhaust gas treatment apparatus according to an embodiment of the present invention.
  • a step of suppressing backflow of the exhaust gas of the region having a lower negative pressure among the circulation zone and the exhaust zone to the gap side between the trolley and the suction unit is included.
  • the reverse flow of the exhaust gas can be suppressed by using a blocking portion provided at the boundary between the circulation region and the exhaust region.
  • the sintered ore charged into the bogie and completed sintering is distributed to the crushing part at the end of the conveying path, crushed to a predetermined particle size at the crushing part, and then sorted on the screen and supplied to another blast furnace operation according to the particle size, It can be used as the top light or can be classified as semi-glow and reused as raw material.
  • a gap may be sealed at the boundary between the exhaust area and the circulation area to seal the gap between the bogie and the windbox.
  • the blocking portion has a flap or a flap and ribs, the total flow rate of the exhaust gas and the exhaust gas flow rate circulated can be increased, thereby increasing the efficiency of the operation. It can be further improved and a high quality sintered ore can be obtained.

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Abstract

La présente invention concerne un appareil de traitement de gaz d'échappement et un procédé de traitement de gaz d'échappement appliqué à ce dernier, l'appareil comprenant : une unité d'aspiration s'étendant d'une partie inférieure d'un bogie le long d'une direction de déplacement du bogie et possédant une région de circulation et une région d'échappement qui sont séparées l'une de l'autre, le bogie étant installé de manière à pouvoir traiter une matière première tout en déplaçant une pluralité de sections ; et une partie de blocage installée au niveau d'une limite entre la région de circulation et la région d'échappement de manière à sceller un espace entre le bogie et la partie d'aspiration, moyennant quoi une perturbation mutuelle des flux de gaz d'échappement peut être supprimée ou empêchée en raison d'une différence de pression négative entre des sections individuelles dans une installation.
PCT/KR2017/011350 2016-10-18 2017-10-13 Système de traitement de gaz d'échappement et procédé de traitement WO2018074783A1 (fr)

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EP17862388.0A EP3531052A1 (fr) 2016-10-18 2017-10-13 Système de traitement de gaz d'échappement et procédé de traitement
JP2019542336A JP2019534951A (ja) 2016-10-18 2017-10-13 排ガスの処理装置及び処理方法
CN201780064145.XA CN109844435B (zh) 2016-10-18 2017-10-13 废气处理装置和处理方法

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KR1020160135152A KR101796083B1 (ko) 2016-10-18 2016-10-18 배가스 처리장치 및 처리방법

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JP2019534951A (ja) 2019-12-05
TWI663323B (zh) 2019-06-21
CN109844435A (zh) 2019-06-04
TW201819756A (zh) 2018-06-01

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