TWI663323B - Exhaust-gas processing apparatus and method - Google Patents

Abstract

The invention provides an exhaust gas treatment equipment, comprising: a gas suction array, which extends in a moving direction of a transport vehicle and is disposed below the transport vehicle, the transport vehicle is arranged to accommodate a raw material while along a plurality of processing areas Moving, wherein the gas suction array has an exhaust gas circulation area and an exhaust gas emission area separated from each other; and a gas blocking structure is disposed at a boundary between the exhaust gas circulation area and the exhaust gas emission area to reduce the The space between the gas suction array and the transport vehicle at the boundary. In addition, the present invention provides an exhaust gas treatment method using the exhaust gas treatment equipment.

Description

Exhaust gas treatment equipment and method

Embodiments of the present invention relate to an exhaust gas treatment device and an exhaust gas treatment method. More specifically, embodiments of the present invention relate to an exhaust gas treatment apparatus and an exhaust gas treatment method, which can suppress or prevent exhaust gas flow caused by differences between negative pressures in a plurality of processing zones of a processing system. Interference.

The sintered ore is produced by using fine iron ore, limestone, coke, and anthracite as raw materials, and the sintered ore is then loaded into a blast furnace. In a blast furnace process for producing molten iron, sintered ore is loaded into the blast furnace together with iron ore and coke. The sintered ore production process sinters fine iron ore to a particle size suitable for use in a blast furnace. The sintered ore production process involves preparing a mixture of raw materials and heat treating the mixture into sintered ore. The latter is usually performed in a sintering machine.

The process of producing sintered ore by heat-treating the mixture of raw materials is performed as follows: while the sintering carriage is moved in the extension direction of the sintering machine, the mixture of raw materials is loaded onto the transportation truck at a constant height. One surface layer of the raw material mixture is ignited by an ignition unit to form a combustion raceway or combustion zone. Using an exhaust gas treatment device, the air is forcibly fed down into the sintering conveyor to burn it The cavity is moved down, thereby sintering the mixture of raw materials, that is, producing sintered ore. Then, the sintered ore is crushed and cooled by a crusher and a cooler, and the crusher and the cooler are arranged in an unloading area of the sintering machine. The crushed and cooled sintered ore is sorted into 5 millimeter (mm) to 50 millimeter particles suitable for use in a blast furnace, and then transferred to the blast furnace.

American Institute of Mining Engineers Kinsey of Engineers (AIME) disclosed a sintering exhaust gas circulation technology for improving the function of sintering machines and saving energy in the United States in 1975. In this publication, an on-strand cooling sintering machine having a structure is proposed in which one of the sintering machines is extended in length and a cooler is added to the sintering machine. This structure includes a sintering zone and a cooling zone. Gas is drawn from the sintering zone and the cooling zone, respectively. Therefore, an energy-saving sintering model is proposed by circulating the high-temperature exhaust gas discharged from the cooling zone as hot air into the sintering zone. Subsequently, similar research or patent applications were filed in Japan and Europe during the 1970s and 1980s.

When the sintering exhaust gas circulation technology is applied to the sintering mechanism, the energy required for sintering can be reduced by recycling the sensible heat of the exhaust gas for sintering. After the first oil crisis, in 1984 in Wakayama in Japan, a four-sintering was modified by an on-board cooling sintering machine, and then the sintering machine was cooled The air in the section is recirculated for reuse as sintering air. In addition, in Kyushu and Kashima, sintering exhaust gas circulation technology is used to circulate exhaust gas from the cooler to the sintering machine. In 1991, in Japan's Nagano Industry Co., Ltd. (NKK), in order to increase the gas suction capacity and therefore the productivity of Fukuyama No. 4 sintering, a second blower was installed and the exhaust gas recovered by the second blower was directed toward the sintering machine A sintering ore discharge unit is recycled, thereby enhancing the sensible heat recovery capacity of a boiler installed in the sintering machine, while increasing the gas suction capacity.

The above method is aimed at reducing the amount of exhaust gas, and at the same time by transferring the sensible heat of the exhaust gas Save energy to the sintered layer or ignition furnace. For this reason, the sintering exhaust gas circulation technology is applied in the sintering mechanism.

At the same time, due to the enforcement of environmental policies and regulations, the investment and operating costs of processing systems for the treatment of sulfur oxides (SOx) and nitrogen oxides (NOx) are now burdened. As a result, steel mills in each country are responding to greenhouse gas regulations and reducing energy costs by recirculating exhaust gas from sintering machines to the greatest extent while reducing investment costs in pollution prevention systems.

For example, Kitakyushu No. 3 sintered by Nippon Steel Corporation (NSC) reduced the amount of exhaust gas by 28% in 1992 by improving a sintering system to reduce the amount of exhaust gas while maintaining the productivity and quality of sintered ore. . In 1994, Lurgi (Germany) developed an Emission Optimized Sintering (EOS) technology and applied it to the Hoogovens sinter plant in the Netherlands. Reduced by about 40%. These cases can comply with international environmental regulations, but the technology has not been completed.

In addition, since 1994, the Nippon Steel Corporation's FUTSU process laboratory, Austria's Voest-Alpine in Austria, Australia's BHP, and Italy's Materials Research Center (Centro Sviluppo Materiali; CSM) has been committed to transforming the sintering process into an environmentally friendly process. Sumitomo Corporation is studying a two-stage ignition sintering method in which raw materials are separately loaded into an upper stage and a lower stage in an on-board cooling sintering machine, and the upper stage And the material in the lower stage is ignited and sintered, and the exhaust gas from the upper stage is reused to sinter the material in the lower stage.

In order to increase the productivity of sintered ore, there is an increase in A method of increasing the volume of the sintering air by the capacity of the blower, and a method of increasing the volume of the sintering air by expanding the firing area of the sintering machine. In this regard, as the blower capacity of the exhaust gas treatment equipment increases, facilities for cleaning the exhaust gas must be further extended, and in addition, the maintenance cost of the exhaust gas treatment equipment increases.

Therefore, POSCO's Pohang No. 4 sintering in Pohang has introduced sintering exhaust gas recycling technology. In this regard, in order to cope with the increasing demand for sintered ore due to the increase in the internal capacity of the blast furnace and the high-volume slag discharge process, the firing area of the sintering machine is expanded and the volume of the sintering air flow is correspondingly increased. Therefore, in order to cope with the increase in the volume of the sintering air flow, another blower for exhaust gas circulation is added to the exhaust gas treatment equipment.

In this regard, although the position where the ventilation resistance of the sintered layer is the largest is defined as an exhaust gas suction position, the added blower uses a high pressure to suck the exhaust gas at the position defined above, and directs the exhaust gas toward the relative consumption of oxygen. One of the fewer sintered layers is supplied at the back end. Since the exhaust gas sucked into the added blower circulates toward one of the sintered layers, the total amount of exhaust gas can be kept constant. Therefore, even when the firing area of No. 4 sintering in Pohang City is increased and a blower is added thereto, it is necessary to use the existing structure related to exhaust gas cleaning in the exhaust gas treatment equipment, as when the exhaust gas treatment equipment has not been modified.

Embodiments of the present invention provide an exhaust gas treatment apparatus and an exhaust gas treatment method, which can suppress or prevent interference between exhaust gas flows caused by differences between negative pressures in a plurality of processing areas of a processing system.

Embodiments of the present invention provide an exhaust gas treatment device and an exhaust gas treatment method, which can suppress or prevent interference between exhaust gas flows in a treatment system, thereby improving processing. Process efficiency of the management system.

According to an embodiment of the present invention, an exhaust gas treatment device includes a gas-suction array extending in a moving direction of a truck and disposed below the truck, and the truck is Arranged to accommodate a raw material while moving along a plurality of processing regions, wherein the gas suction array has an exhaust-gas circulation region and an exhaust-gas discharging region separated from each other; and A gas-blocking structure is disposed at a boundary between the exhaust gas circulation area and the exhaust gas emission area to reduce a gap between the gas suction array and the transport vehicle at the boundary.

The gas suction array may include a plurality of wind boxes arranged along the moving direction of the transport vehicle, wherein the wind boxes have a plurality of upper ends extending side by side along the gas suction array, respectively, wherein The upper ends are coupled to each other, wherein the gas blocking structure is disposed on adjacent upper ends of some of the bellows adjacent to the boundary between the exhaust gas circulation area and the exhaust gas discharge area, and Adjacent bellows define the boundary between them.

Within a margin of error, a gap between a top surface of the gas barrier structure and a bottom surface of the transport vehicle at the boundary may be between 0 millimeters (mm) and 100 millimeters, excluding 0 millimeters and including 100 millimeters. In a range.

According to another embodiment of the present invention, an exhaust gas treatment device includes: a plurality of bellows arranged along a moving direction of a transport vehicle and disposed below the transport vehicle, wherein the transport vehicle is arranged to accommodate a raw material while along the A plurality of processing areas move, wherein the bellows has an exhaust gas circulation area and an exhaust gas discharge area separated from each other, wherein some upper ends of the bellows are compared with upper ends of the remaining ones of the bellows Protruding further upward, wherein the upper ends of the some of the bellows are adjacent to a boundary between the exhaust gas circulation area and the exhaust gas emission area.

Some of the bellows include a first bellows and a second bellows, and the first bellows and the second bellows define the boundary therebetween and are respectively disposed in the exhaust gas circulation area And in the exhaust emission area, within an error range, an interval between the upper end of the first bellows and the second bellows and a bottom surface of the transport vehicle may be 0 mm to 100 mm It does not include 0 mm but within a range of 100 mm.

The exhaust gas treatment device may further include a gas blocking structure provided at the upper ends of the first wind box and the second wind box, and interposed between the upper end of the first wind box and the second wind box. Between the upper ends of the bellows to reduce a gap between the transport vehicle and the some of the bellows at the boundary.

The gas blocking structure may include: a gas-blocking body protruding in a vertical direction and extending in a direction crossing one of the moving direction and the vertical direction of the transport vehicle; and a wing ( flap) extending from the gas blocking body in the direction of travel of the transport vehicle.

The fin may extend from at least one of an upper end and a lower portion of the gas blocking body or a portion between the upper end and the lower portion of the gas blocking body. The fin may be disposed in at least one of the exhaust gas circulation area and the exhaust gas discharge area. The fin may be disposed in a lower negative pressure area of the exhaust gas circulation area and the exhaust gas discharge area. When the cross-sectional area of one of the upper ends of one of the air boxes facing the fin is set to 1, the extension length of one of the fins may be greater than 0 and less than or equal to 2/3.

The gas barrier structure may further include at least one rib formed to protrude upward from a top surface of the fin. The convex rib may extend in the moving direction of the transport vehicle; or the convex rib may extend in a direction crossing the moving direction of the transport vehicle. The gas barrier structure may include a plurality of ribs, and some of the ribs may be in the direction of travel of the transport vehicle. And the rest of the ribs may extend in a direction that intersects the moving direction of the transport vehicle.

The gas barrier structure may further include a tip portion. The tip portion is inclined from a distal end of the fin in a direction from the gas barrier body of the gas barrier structure to one end of the fin. Way down. When the cross-sectional area of an upper end of a bellows facing one of the fins is set to 1, the sum of the extension lengths of the fin and the tip portion in the moving direction of the transport vehicle may be greater than 0 and less than Or equal to 2/3.

According to an embodiment of the present invention, an exhaust gas treatment method includes: loading a raw material into a transport vehicle, and heat-treating the raw material in the transport vehicle while moving the transport vehicle along a plurality of processing areas; using a A gas suction array sucks down one of the transport carts, wherein the gas suction array extends in a moving direction of the transport cart and is disposed below the transport cart, wherein the gas suction array has separate An exhaust gas circulation area and an exhaust gas discharge area; and suppressing the flow of gas from a lower negative pressure area of the exhaust gas circulation area and the exhaust gas discharge area into a space between the gas suction array and the transport vehicle.

The step of inhibiting the flow of the gas from the lower negative pressure area into the space may include using a gas barrier structure disposed at a boundary between the exhaust gas circulation area and the exhaust gas discharge area.

According to the embodiment of the present invention, interference between exhaust gas flows caused by differences between negative pressures in a plurality of processing areas of a raw material processing system can be suppressed or prevented, thereby improving process efficiency of the raw material processing system.

For example, when an embodiment of the present invention is applied to a sintered ore production process, a gas barrier structure is provided in the bellows arranged in the traveling direction of the transport vehicle and the The adjacent upper ends of the bordered adjacent bellows are on the adjacent upper ends, and the boundaries defined by the adjacent bellows are between the exhaust gas circulation area and the exhaust gas emission area. When the raw materials are loaded on the transport vehicle and the transport vehicle travels along these processing areas while the raw materials are heat-treated, and the gas in the transport vehicle is sucked down, the gas blocking structure inhibits the gas from the exhaust gas circulation area and the exhaust gas. One of the lower negative pressure areas in the emission area flows to the higher negative pressure area in the exhaust gas circulation area and the exhaust gas emission area through the interval between the gas suction array and the delivery vehicle.

Some of the upper ends of the bellows arranged in the direction of travel of the delivery car project more upwardly from the upper ends of the remaining ones of the bellows, wherein some of the bellows are adjacent to the exhaust gas The boundary between the circulation area and the exhaust emission area. In addition, a gas barrier structure may be disposed on adjacent upper ends of the adjacent bellows. When the raw materials are loaded on the transport vehicle and the transport vehicle travels along these processing areas while the raw materials are heat-treated, and the gas in the transport vehicle is sucked down, the narrowed gap or gas barrier structure can be suppressed The gas flows from a lower negative pressure area in one of the exhaust gas circulation area and the exhaust gas discharge area to a higher negative pressure area in the exhaust gas circulation area and the exhaust gas discharge area through a space between the gas suction array and the transport vehicle.

Therefore, the exhaust gases in adjacent bellows respectively located in the exhaust gas circulation area and the exhaust gas discharge area at the boundaries of the exhaust gas circulation area and the exhaust gas discharge area may not interfere with each other. Therefore, it is possible to prevent the gas from flowing back from the lower negative pressure area in the exhaust gas circulation area and the exhaust gas discharge area to the higher negative pressure area in the exhaust gas circulation area and an exhaust gas discharge area. Therefore, both the circulating flow efficiency and the exhaust flow efficiency of the exhaust gas flow can be improved, and the overall exhaust gas flow rate can be improved. Therefore, the efficiency of the sintered ore production process can be improved, and high quality sintered ore can be produced.

10‧‧‧ delivery car

11‧‧‧ bottom

21‧‧‧ raw material funnel

22‧‧‧ Upper sintered ore funnel

30‧‧‧Ignition furnace

400‧‧‧ exhaust gas treatment equipment

410‧‧‧ bellows

411‧‧‧ bellows

412‧‧‧ bellows

413‧‧‧Gas blocking structure

413'‧‧‧Gas blocking body

413A‧‧‧Gas blocking structure

413B‧‧‧Gas blocking structure

413C‧‧‧Gas blocking structure

413D‧‧‧Gas blocking structure

413E‧‧‧Gas blocking structure

414‧‧‧wing

415‧‧‧ raised rib

416‧‧‧ Tip

420‧‧‧gas snorkel

421‧‧‧gas snorkel

422‧‧‧gas vent tube / second gas vent tube group

430‧‧‧Circulation tube

440‧‧‧Slim discharge chamber

451‧‧‧Circular blower

452‧‧‧Main Blower

460‧‧‧Gas exhaust hood

470‧‧‧ Pollutant collector

480‧‧‧Gas Emission Module

Rc‧‧‧Exhaust gas circulation zone

Rd‧‧‧ Exhaust Emission Area

FIG. 1 is a schematic diagram of a raw material processing system including an exhaust gas treatment equipment according to an embodiment of the present invention; FIG. 2 is a gas suction array and a gas illustrating an exhaust gas treatment equipment according to an embodiment of the present invention Schematic diagram of a barrier structure; FIG. 3 is a schematic diagram of a gas barrier structure according to a first modified embodiment of the present invention; FIG. 4 is a schematic diagram of a gas barrier structure according to a second modified embodiment of the present invention Figure 5 is a schematic diagram of a gas barrier structure according to a third modified embodiment of the present invention; Figure 6 is a schematic diagram of a gas barrier structure according to a fourth modified embodiment of the present invention; Figure 7 FIG. 8 is a schematic diagram of a gas blocking structure according to a fifth modified embodiment of the present invention; FIG. 8 is a schematic diagram showing an exhaust gas flow of a gas suction array according to a comparative example; Numerical analysis diagram of exhaust gas flow in the gas suction array of the invention example and comparative example; FIG. 10 shows the gas suction according to the comparative example, the embodiment of the present invention, and the modification of the embodiment of the present invention. Photographs of the results of a reduced modeling experiment of one of the exhaust gas flows inside the column; and FIG. 11 shows a table indicating the comparison of the comparative example, the embodiment of the present invention, and the modification of the embodiment of the present invention. Results of a model reduction experiment on exhaust gas flow in a gas suction array.

Hereinafter, embodiments of the present invention will be explained in detail with reference to the accompanying drawings. However, the present invention is not limited to the embodiments described below, but can be implemented in various forms. State the invention The embodiments are intended to complete the description of the present invention and to inform those skilled in the art of the scope of the present invention. The drawings may be enlarged to illustrate embodiments of the present invention. In all drawings, the same numbers refer to the same elements.

In the terms used to describe the embodiments of the present invention, an "upper" or "lower" refers to an upper or lower part of a component. In addition, "above" or "below" is used to indicate a space that directly or indirectly contacts an upper or lower portion of a component.

The present invention provides an exhaust gas treatment device and method, which are configured to allow flow interference between a circulating flow gas and an exhaust flow gas while the exhaust gas flow in a sintering machine is suppressed in the machine, and such flow interference is originally This can result from differences between negative pressures in each processing zone (eg, differences between negative pressures in the bellows). In the following, the embodiments will be explained in detail with reference to a sintered ore production process of a steelmaking plant. Obviously, the present invention is also applicable to exhaust gas flow control of various treatment systems.

When stating an embodiment of the present invention, a raw material processing system according to an embodiment of the present invention is first explained so that the understanding of the present invention is clear. With reference to such a system, an exhaust gas treatment device and an exhaust gas treatment method according to embodiments of the present invention will be described in detail.

FIG. 1 is a schematic diagram in which an exhaust gas treatment equipment according to an embodiment of the present invention is applied to a raw material processing system. FIG. 2 is a schematic diagram illustrating a gas suction array and a gas blocking structure of an exhaust gas treatment equipment according to an embodiment of the present invention.

In addition, FIG. 3 to FIG. 7 are schematic diagrams of modifications of a gas barrier structure according to an embodiment of the present invention. In this regard, FIG. 3 is a schematic diagram of a gas barrier structure according to a first modified embodiment of the present invention. FIG. 4 is a schematic diagram of a gas barrier structure according to a second modified embodiment of the present invention. FIG. 5 shows a gas barrier according to a third modified embodiment of the present invention. Block diagram. FIG. 6 is a schematic diagram of a gas barrier structure according to a fourth modified embodiment of the present invention. FIG. 7 is a schematic diagram of a gas barrier structure according to a fifth modified embodiment of the present invention.

Referring to FIG. 1, a raw material processing system according to an embodiment of the present invention includes a transport vehicle 10, a raw material hopper 21, an upper-sintered ore hopper 22, an ignition furnace 30, and an exhaust gas treatment device 400. .

The raw material processing system can obtain a raw material, and heat-process the raw material while sequentially moving it along a plurality of processing zones. At least a portion of the exhaust gas generated from the treatment zones may be circulated in at least a portion of the zones. In the context of this description, the system may be a sintering machine. For example, the system may be a downward-suction type sintering machine having an exhaust gas recirculation structure.

The transport vehicle 10 may be configured so that the raw materials therein can be heat-treated in a plurality of processing zones. The raw material processing system includes a plurality of transport vehicles, which can be continuously arranged and coupled together in the extending direction of the raw material processing system. The transport vehicle can be arranged to run in the arrangement direction of the processing areas. The transport vehicles 10 are open at the top thereof, and thus the raw materials are loaded in the internal space in each of the transport vehicles. The internal space of these transport vehicles corresponds to a heat treatment space. The raw materials can be loaded inside the transport vehicle 10.

A bottom portion 11 of one of the transport vehicles 10 may have a configuration in which a plurality of elongated strips are arranged in a grid structure. With this configuration, the internal space of the transport vehicle 10 can be in gas communication with a corresponding bellows as described later, so that the gas in the inner space can be sucked down through the bellows.

An upper end of the system can define a conveying path of the transport vehicle 10, and the system One of the lower portions may define a return path of the transport vehicle 10. The transport vehicle 10 travels along the conveying path in a first direction, and therefore, the raw materials loaded therein are moved in the first direction while being heat-treated. When the transport vehicle enters the return path, the heat-treated sintered ore is discharged into a crushing unit (not shown in the figure), and then, the transport vehicle travels along the return path in a second direction opposite to the first direction, And then it can be returned to the conveying path.

The transport path may include multiple processing zones. The processing areas include: a loading area in which the raw material funnel 21 and the upper sintered ore funnel 22 are located; an ignition area in which an ignition furnace 30 is located downstream of the loading area; and a sintering area located downstream of the ignition area. The loading area, the ignition area, and the sintering area can be sequentially arranged along the moving direction of the raw materials.

The loading area can be located upstream of the conveying path, where the raw materials begin to move in the conveying path. In the loading area, the raw materials are loaded into the inner space of the transport vehicle 10, thereby forming a raw material layer in the inner space of the transport vehicle 10. The ignition area is located downstream of the loading area in the moving direction of the raw material, and can extend in the moving direction of the raw material. In the ignition zone, an upper end (hereinafter, referred to as an upper material layer) of one of the raw material layers loaded in the transport vehicle 10 is ignited.

In the sintering zone, a combustion cavity is moved from a material layer above the raw material layer loaded on the transport vehicle 10 to a lower portion of the raw material layer (hereinafter, referred to as a "lower material layer"). This sintering zone is a zone for sintering and cooling the raw material layer, and is positioned downstream of the ignition zone in the moving direction of the raw material. While each of the transport vehicles 10 sequentially moves the raw materials along the loading area, the ignition area, and the sintering area, the raw materials in each of the transport vehicles 10 are subjected to heat treatment, thereby generating a sintered ore.

The raw material hopper 21 contains raw materials therein, and is located above the transport vehicle 10 in the loading area. The raw material hopper 21 may have a loading chute and a drum feeder at the bottom opening thereof, and therefore, raw materials may be loaded in the transport vehicle 10. on In this regard, the hopper 21 may subject the raw materials to vertical segregation before loading.

The raw material may contain one of the raw materials used for the production of sintered ore. For example, by mixing, humidifying, and granulating an iron source, an additive, and a solid fuel, the raw material may have particles having a particle size of about several millimeters. In this regard, the iron source is a source having an iron component, and may include iron ore and fine iron ore. The additive may include limestone as one of the materials containing calcium carbonate. The solid fuel may include coal-based solid fuel, which includes coke powder and anthracite.

The upper sintered ore funnel 22 is located in the loading zone and upstream of the raw material hopper 21 in the direction of movement of the raw material. The upper sintered ore may be provided by selecting a sintered ore having a particle diameter of, for example, 8 mm to 15 mm from the sintered ore. The upper sintered ore can be loaded into the inner space of the transport vehicle 10 before the raw materials are loaded into the inner space of the transport vehicle 10, thereby preventing the raw material from adhering to the bottom of the transport vehicle 10 or preventing the raw material from passing downward through the bottom of the transport vehicle Gap defined in.

The ignition furnace 30 is spaced from the raw material hopper 21 in the running direction of the transport vehicle 10. The ignition furnace 30 may be located above the transport vehicle 10. That is, the ignition furnace 30 may be located in the ignition area of the conveying path, and downstream of the raw material hopper 21 in the direction in which the transport vehicle 10 travels. The ignition furnace 30 is configured to inject a flame downward, and is used to heat the upper material layer by spraying the flame onto the upper material layer. In this regard, the flame ignites the solid fuel contained in the upper material layer.

While each of the transport vehicles 10 moves along the processing areas to heat-treat the raw materials in the inner space of the transport vehicle, an exhaust gas treatment device 400 is configured to suck downward from the inner space of the transport vehicle 10 according to an embodiment of the present invention. The gas circulates at least a portion of the sucked gas between the processing zones.

Referring to FIG. 1 and FIG. 2, an exhaust gas treatment device according to an embodiment of the present invention 400 may include a gas blocking structure 413, a gas suction array, a gas vent pipe 420, an exhaust gas circulation mechanism, and an exhaust gas discharge mechanism.

The gas suction array may be disposed on the bottom of the transport vehicle 10 and extend along the traveling direction of the transport vehicle 10. For example, the gas suction array may extend in the running direction of the transport vehicle 10 while the top end thereof surrounds the bottom of the transport vehicle 10. More specifically, the gas suction array may include a plurality of bellows 410 arranged along the traveling direction of the transport vehicle 10. Adjacent ones of the bellows 410 may have adjacent upper ends arranged side by side in the extending direction of the gas suction array. Each of the bellows 410 is in gas communication with the internal space of the corresponding transportation vehicle 10 through a gap defined in the bottom 11 of the corresponding transportation vehicle 10. Each of the bellows 410 forms a negative pressure in the internal space of the corresponding transport vehicle to suck down the gas in the internal space of the corresponding transport vehicle 10, thereby enabling the combustion cavity in the raw material layer to be material from the upper part of the raw material layer. The layer is transferred to the material layer below the raw material layer. During this process, the exhaust gas is collected into the bellows 410.

After the transportation vehicles 10 are subjected to the ignition of the ignition furnace 30, each transportation vehicle travels in a first direction and travels along the gas suction array. In this regard, the gas suction array generates a suction force in a downward direction in the internal space of the corresponding transport vehicle 10. This suction force enables the air outside the transport vehicle 10 to flow into the internal space of the corresponding transport vehicle 10, and then enables the gas in the internal space to be drawn downward, thereby moving the combustion cavity downward. When the corresponding transportation vehicle 10 passes through the sintering zone, the combustion cavity reaches the bottom 11 of the transportation vehicle 10, thereby completing the sintering of the raw material layer. The sintered ore has been cooled when the corresponding transport vehicle 10 moves toward one end of the transport path. The cooled sintered ore can be discharged by a sintered ore discharger at the end of the conveying path.

The bellows 410 is spaced from the bottom 11 of the transport vehicle 10 by a predetermined gap. This is to prevent the moving transport vehicle 10 from colliding with the air box 410 when the gas in the inner space of the transport vehicle is sucked downward by the air boxes 410. In addition, when corresponding transport vehicles pass through each of the zones, At each point, the ventilation resistance in the inner space of the delivery vehicle changes based on the sintered state of the raw materials. For this reason, the bellows 410 is spaced a predetermined gap from the bottom 11 of the transport vehicle 10 to efficiently suck gas from the inner space of the transport vehicle 10. That is, the adjacent and contacting upper ends of the bellows 410 are spaced a predetermined distance from the bottom 11 of the transport vehicle 10.

On the other hand, the gas suction array may have an exhaust gas circulation region Rc and an exhaust gas emission region Rd separated from each other. Therefore, the bellows 410 may be divided into a plurality of bellows 411 provided in the exhaust gas circulation region Rc and a plurality of bellows 412 provided in the exhaust gas discharge region Rd.

The exhaust gas circulation region Rc of the gas suction array may correspond to a part of the gas suction array extending from a first point in the sintering zone to a second point in the sintering zone. In this regard, the first point in the sintering zone may correspond to one of the following points: At this point, the combustion cavity in the raw material layer reaches the bottom 11 of the transport vehicle 10, and thus the sintering of the raw material layer is completed. The second point in the sintering zone may correspond to a point at which the value of the ventilation resistance of one of the sintered raw material layers begins to fall below a predetermined value.

Therefore, the gas discharge region Rd of the gas suction array corresponds to a combination of two parts: a part of the gas suction array extending from the beginning of the conveying path to the first point in the sintering zone as described above, and the gas suction The array extends from a second point in the sintering zone to a portion of the end of the transport path. That is, the discharge area may correspond to the rest of the gas suction array except the circulation area.

The first point and the second point in the sintering zone as described above are merely examples for illustrating the present invention. The invention is not limited to this. Depending on the process requirements, the sintering zone can be configured in various ways. In addition, the boundary defined above between the exhaust gas circulation region and the exhaust gas emission region is only one example of various configurations for circulating the exhaust gas. The exhaust gas circulation area and the exhaust gas discharge area can be configured in various ways, so that the exhaust gas is discharged and circulated in various ways.

Before explaining the gas blocking structure 413, the gas vent pipe 420, the exhaust gas circulation mechanism, and the exhaust gas emission mechanism of the exhaust gas treatment apparatus 400 according to an embodiment of the present invention will be exemplified first.

The exhaust gas treatment apparatus includes a plurality of gas vent pipes, and the gas vent pipes are arranged along the extending direction of the gas suction array so as to be spaced apart from each other. The gas vent pipes may communicate with the bottom of the gas suction array (ie, the bottom of the bellows 410), respectively. The gas vent pipe 420 may be divided into a plurality of gas vent pipes 421 communicating with the bellows 411 provided in the exhaust gas circulation area, and a plurality of gas vent pipes 422 communicating with the bellows 412 provided in the exhaust gas discharge area.

The exhaust gas circulation mechanism has: a first end portion communicating with some of the gas vent pipes 420 (for example, a gas vent pipe 421 communicating with a bellows 411 provided in the exhaust gas circulation area); and a second end portion, Facing one of the predetermined locations in these processing areas. Therefore, the exhaust gas circulation mechanism can circulate the exhaust gas sucked from the point where the ventilation resistance of the sintered raw material layer is the largest toward a predetermined point on the processing areas.

In this regard, the second end portion of the exhaust gas circulation mechanism may be opened between the first point of the sintering zone and the end point of the conveying path. In one embodiment, the second end portion of the exhaust gas recirculation mechanism may open toward a point located downstream of the first point of the sintering zone. This means that the opening of the second end of the exhaust gas circulation mechanism faces the downstream point of the sintering zone where the oxygen consumption is relatively small. Obviously, in addition to the above points, the second end portion of the exhaust gas recirculation mechanism may be opened toward each point on the processing areas. Hereinafter, a configuration will be referred to one of the exhaust gas circulation mechanisms configured to circulate the exhaust gas sucked from the point where the ventilation resistance of the sintered raw material layer is maximized toward the downstream point of the sintering zone.

The exhaust gas circulation mechanism may include a circulation pipe 430, a circulation blower 451, and a gas discharge cover 460. One end of the circulation pipe 430 communicates with a gas vent pipe 421 communicating with a bellows 411 provided in the exhaust gas circulation zone. The other end of the circulation pipe 430 may be in communication with the gas discharge cover 460. cycle The blower 451 is, for example, a blower for exhaust gas circulation. The circulation blower 451 is installed at one point of the circulation pipe 430 so that the exhaust gas can flow from one end of the circulation pipe 430 to the other end of the circulation pipe 430. Due to this flow, an exhaust gas circulating flow can be generated in the wind box 411 provided in the exhaust gas circulating area.

The gas discharge cover 460 may extend in the traveling direction of the transport vehicle 10 and above the transport vehicle 10. The gas exhaust hood 460 may extend between the end of the conveying path and a center point in the sintering zone. The lower end of the gas exhaust hood 460 is open, and the lower end of the gas exhaust hood 460 faces the transport vehicle 10. An upper end of the gas discharge hood 460 may communicate with the other end of the circulation pipe 430. The gas exhaust hood 460 receives exhaust gas from the circulation pipe 430 and supplies the gas to the transport vehicle 10. Thereby, the exhaust gas can be circulated.

In each of the gas vent pipes 420, a gas vent pipe 422 that is not connected to the exhaust gas circulation mechanism may communicate with the exhaust gas discharge mechanism. The exhaust gas collected in the wind box 412 provided in the exhaust emission area may be emitted to the atmosphere through the exhaust emission mechanism.

The exhaust emission mechanism has a first end portion and a second end portion. A first end portion of the gas vent pipe 420 is in communication with a second gas vent pipe group 422 communicating with the bellows 412. The second end portion can communicate with the atmospheric space. The exhaust gas discharging mechanism may discharge the exhaust gas collected in the wind box 412 provided in the exhaust gas discharging area toward the atmospheric space. The exhaust emission mechanism may include an elongated emission chamber 440, a pollutant collector 470, a main blower 452, and a gas emission module 480.

The elongated discharge chamber 440 may be hollow. One end of the elongated discharge chamber 440 may be connected to a gas vent pipe 422, and the gas vent pipe 422 communicates with a bellows 412 provided in the exhaust gas discharge area. The other end of the elongated discharge chamber 440 may be connected to a gas discharge module 480. The main blower 452 is, for example, a blower for discharging exhaust gas, and is installed at a predetermined position of the discharge chamber 440. The main blower 452 may generate a flow of exhaust gas from one end of the discharge chamber 440 to the other end of the discharge chamber 440. By this Flow, the exhaust gas flow may be generated in a wind box 412 provided in the exhaust gas discharge area. The exhaust gas may contain pollutants such as dust, nitrogen oxides, and sulfur oxides. To filter out these pollutants, a pollutant collector 470 exists upstream of the main blower 452 in the direction of the exhaust gas flow. The pollutant collector 470 may be installed at one predetermined position of the discharge chamber 440.

A crushing unit (not shown) may be disposed downstream of the sintering zone. The sintered ore discharged from the transport vehicle 10 is crushed into a predetermined particle size by the crushing unit, and then the crushed ore is sieved at a mesh screen (not shown in the figure). The sieved sintered ore can be fed to other processes (such as a blast furnace process) based on its particle size, can be used as an upper sintered ore, or can be reused as a raw material.

Meanwhile, the main blower 452 and the circulation blower 451 have different suction positions and suction areas. That is, the main blower 452 and the circulation blower 451 are different in the position and number of the bellows to which they must act. In addition, the following two are also different: one of the raw material layers in the conveyer 10 connected to the air box 412 connected to the main blower 452 and moving along the air box 412, and connected to the circulation blower 451 One of the raw material layers on the air box 411 and moving along the air box 411 in the array of the transport vehicles 10 is at a level of ventilation. Due to these differences, the main blower 452 and the circulation blower 451 have different operating pressures.

Therefore, the negative pressure applied by the main blower 452 to the bellows 412 provided in the exhaust gas discharge area is different from the negative pressure applied by the circulation blower 451 to the bellows 411 provided in the exhaust gas circulation area. An amount of exhaust gas sucked by the main blower 452 and an amount of exhaust gas sucked by the circulation blower 451 are also different. For example, the amount of negative pressure applied by the circulation blower 451 to the air box 411 provided in the exhaust gas circulation area may be greater than the amount of negative pressure applied by the main blower 452 to the air box 412 provided in the exhaust gas discharge area . Of course, the opposite is also true. That is, the magnitude of the negative pressure in the exhaust gas emission area may be larger.

In this case, the exhaust gas in the low negative pressure region can flow back toward the high negative pressure region. That is, there are different negative pressures at the boundary between the exhaust gas circulation area and the exhaust gas emission area, and interference between the exhaust gas flows may occur, thereby causing the exhaust gas to return to a region with a high negative pressure. The returned exhaust gas can flow into the high negative pressure region through the gap between the bottom 11 of the transport vehicle 10 and the gas suction array.

In this way, due to the difference between the main blower 452 and the circulation blower 451 in at least one of the operating pressure and the suction force, a part of the exhaust gas that must be discharged into the exhaust gas discharge area can be discharged in the exhaust gas of the gas suction array The boundary between the zone and the exhaust gas recirculation zone flows back into the exhaust gas recirculation zone with a higher negative pressure. Therefore, the exhaust gas suction amount of the main blower 452 is reduced. This phenomenon is called flow-interference between the main blower 452 and the circulation blower 451.

According to the embodiment of the present invention, in order to suppress the flow interference between the main blower 452 and the circulation blower 451 at the boundary between the exhaust gas exhaust area and the exhaust gas circulation area of the gas suction array, the gas blocking structure 413 may be formed at the boundary To reduce the gap between the transport cart 10 and the gas suction array.

Referring to FIG. 2, the gas blocking structure 413 extends in a direction crossing the running direction of the transport vehicle 10. For example, the gas blocking structure 413 may be formed in a block shape. The gas blocking structure 413 may be disposed on an adjacent upper end of some of the wind boxes adjacent to the boundary, and the adjacent wind boxes define a boundary between the exhaust gas circulation area and the exhaust gas emission area.

In this regard, within a tolerance range, the gap between the top of the gas blocking structure 413 and the bottom of the transport vehicle 10 may be greater than 0 mm but less than or equal to 100 mm. Here, the tolerance range may refer to a tolerance caused by a mechanical error or an electronic error of a measurement component. Alternatively, the tolerance range may refer to the ability to prevent the bottom 11 of the transport vehicle 10 and the gas barrier structure 413 from binding. One of the minimum clearances for a structural collision between the transport vehicle 10 and the gas barrier structure 413 due to structural deformation.

At the boundary between the exhaust gas emission area and the exhaust gas circulation area, the gas blocking structure 413 can narrow the gap between the bottom 11 of the transport vehicle 10 and the upper end of the bellows. That is, the gas barrier structure 413 can pass through the gap to achieve a substantially gas barrier effect. Therefore, the backflow of the gas from the low negative pressure region to the high negative pressure region can be suppressed. At other locations without the gas barrier structure 413, the exhaust gas can flow freely through the space between the bottom 11 of the transport vehicle 10 and the top of the bellows. Therefore, in each of the exhaust emission region and the exhaust gas circulation region, the exhaust gas can be stably achieved.

The gas barrier structure 413 according to the embodiment of the present invention may include various improvements as described below.

Referring to FIG. 3, a gas blocking structure 413A according to a first modified embodiment of the present invention may include: a gas blocking body 413 ′, which extends in a vertical direction and is perpendicular to the vertical direction and the running direction of the transport vehicle 10 The two extend in one direction; and a wing 414, which is in the form of a fin or a plate, extends from the gas blocking body 413 'in the running direction of the transport vehicle 10. In this regard, the fin 414 may extend horizontally from the upper end of the gas blocking body 413 '.

The airfoil 414 defines a gas flow blocking surface above the air box where the airfoil 414 is located, so that the exhaust gas can be directly prevented from the lower negative pressure area (for example, the exhaust gas emission area) to the higher negative pressure area (for example, the exhaust gas circulation) Zone). That is, in terms of fluid dynamics, the fin 414 has significant importance. In the following, a numerical analysis of the exhaust gas flow in a gas suction array according to an embodiment of the present invention and in a gas suction array according to a comparative example will be described.

The flaps 414 can be used to receive and support via the bottom 11 defined in the transport vehicle 10 The raw materials dropped by the openings further narrow the gap between the transport cart 10 and the gas suction array. In this way, a more effective gas flow blocking can be achieved at the boundary between the exhaust emission area and the exhaust gas circulation area.

Referring to FIG. 5, a gas blocking structure 413C according to a third modified embodiment of the present invention may be different from the gas blocking structure 413A of the first modification in the height of the fin 414. That is, the gas blocking structure 413C according to the third modified embodiment of the present invention may include a gas blocking body 413 ′ protruding in a vertical direction and intersecting with both the vertical direction and the running direction of the transport vehicle 10. Extending in one direction; and a wing 414, which is in the form of a fin or a plate, extends from a lower portion of the gas blocking body 413 'in the running direction of the transport vehicle 10.

As such, in various modifications of the present invention, the fins 414 may extend from the top or bottom of the gas blocking body 413 ', or may extend from a middle portion between the top and the bottom of the gas blocking body 413'. . That is, the fins 414 can extend from various heights of the gas blocking body 413 '.

Referring to FIGS. 3 and 5, the fin 414 may be located in a bellows in at least one of a gas circulation area and an exhaust gas emission area. In this regard, the fins may be located in a bellows in a lower negative pressure region in the exhaust gas circulation region and the exhaust gas emission region. In addition, in a fourth modification of the gas barrier structure 413D described later and a fifth modification of the gas barrier structure 413E described later, a fin 414 may be located in the exhaust gas circulation area and the exhaust gas emission area. In a bellows with a lower negative pressure. In this regard, the first modification, the third modification, the fourth modification, and the fifth modification of the present invention exemplify the fins 414 located in the wind box as an exhaust gas emission region of a lower negative pressure region.

In contrast, referring to FIG. 4, a gas blocking structure 413B according to a second modified embodiment of the present invention may include a pair of fins 414 respectively located in a bellows of an exhaust gas circulation region and a bellows of an exhaust gas emission region. In other words, the gas barrier structure according to the second modified embodiment of the present invention 413B may include: a gas blocking body 413 'extending in a direction that intersects with the running direction of the transport vehicle 10; a pair of fins 414 in the form of a wing or a plate and extending from an upper end of the gas blocking body 413' It protrudes in the running direction of the transport vehicle 10 and is disposed in the exhaust gas circulation area and the exhaust gas discharge area, respectively.

Obviously, in addition to the modifications described above, the embodiments of the present invention may further include various modifications, including making a fin 414 located only in one of the higher negative pressure region in the exhaust gas circulation area and the exhaust gas discharge area. in. That is, the modified fin 414 according to the present invention may be located in an air box of at least one of the exhaust gas circulation area and the exhaust gas discharge area.

According to a modification of the present invention, when the width of the top of the bellows facing the flap 414 is set to 1, the extension length of the flap may be greater than 0 and less than or equal to 2/3. If the extension length of the fin 414 is more than 2/3 with respect to the width 1 of the top of the air box facing the wing 414, the effect of preventing exhaust gas from flowing back becomes greater, but the exhaust gas flow into the air box facing the wing Can be bad. For this reason, the extension length of the fins 414 is equal to or less than 2/3 with respect to the width 1 of the top of the bellows facing the fins 414.

Referring to FIG. 6, a gas blocking structure 413D according to a fourth modified embodiment of the present invention may further include at least one rib 415 protruding upward from a top surface of the wing 414. That is, the gas blocking structure 413D according to the fourth modified embodiment of the present invention may include a gas blocking body 413 ′ protruding in a vertical direction and intersecting with both the vertical direction and the running direction of the transport vehicle 10. Extending in one direction; a wing 414 in the form of a fin or a plate extending from a lower portion of the gas blocking body 413 ′ toward a bellows of the exhaust gas discharge area in the running direction of the transport vehicle 10; and at least one rib 415 , Protruding upward from one of the fins 414.

In this regard, in FIG. 6, a fin 414 that is provided only in a bellows of an exhaust gas emission area and extends from a lower portion of the gas blocking body 413 ′ is shown. The invention is not limited to this. root The wing 414 according to the fourth modification of the present invention may be located only in the wind box of the exhaust gas circulation area, or may be located in each of the wind box of the exhaust gas discharge area and the wind box of the exhaust gas circulation area. In addition, as described above, the fins 414 can extend from portions having different heights (including the upper and lower portions of the gas blocking body 413 ').

The convex ribs 415 may be plural, and may extend in a traveling direction of the transport vehicle or in a direction crossing one of the vertical direction and the traveling direction of the transport vehicle. In this regard, some of the ribs 415 extend in the running direction of the transport vehicle, and the rest of the ribs 415 extend in one of the directions intersecting with both the vertical direction and the running direction of the transport vehicle, In this way, a grid structure can be achieved. By using such a grid structure, the raw materials falling on the top surface of the fin 414 can be accommodated in the grid structure, thereby suppressing or preventing backflow of exhaust gas.

In addition, the above-mentioned rib 415 imposes a flow resistance toward the exhaust gas flowing on the top surface of the fin 414, and can suppress the exhaust gas from flowing from the low negative pressure region to the high negative pressure region.

Referring to FIG. 7, a gas blocking structure 413E according to a fifth modification of the present invention may further include a tip portion 416 protruding downward from a distal end of the wing 414 in an inclined manner. That is, the gas blocking structure 413E may include: a gas blocking body 413 ′ protruding in a vertical direction and extending in a direction that intersects with the vertical direction and the running direction of the transport vehicle 10; a wing 414 showing a One of the forms of fins or plates extending from an upper end of the gas blocking body 413 ′ toward a bellows of the exhaust gas discharge area in the running direction of the transport vehicle 10; and a tip portion 416 formed as one of the self-fins 414 The distal end protrudes downward in an inclined manner from one side of the body 413 'to one end of the tab 414.

Due to the tip portion 416, a large gas flow blocking area can be reliably ensured in the air box facing the fin 414, and a collision between the gas blocking structure and the bottom portion 11 of the transport vehicle can be prevented. For example, when the cross-sectional area of the upper end of the bellows facing the flap 414 is set to 1, the total extension length of one of the flap 414 and the tip portion 416 in the traveling direction of the transport vehicle may be greater than 0 and less than or equal to 2/3.

The features of the gas barrier structure according to the above modification may be replaced or combined with each other to form various configurations of the gas barrier structure.

According to another embodiment (second embodiment) of the present invention, an exhaust gas treatment equipment for a raw material processing system may be changed as follows: The exhaust gas treatment equipment may include: a plurality of bellows, moving along one of a transport vehicle They are arranged and arranged below the transport vehicle, wherein the transport vehicle is arranged to move along a plurality of processing areas while accommodating a raw material therein, wherein the bellows has an exhaust gas circulation area and an exhaust gas emission area separated from each other, wherein Some of the upper ends of the bellows project more upwards than the upper ends of the remaining ones of the bellows, wherein some of the bellows are adjacent to the exhaust gas circulation area and the exhaust gas emission area The border.

In one embodiment, some of the bellows include a first bellows and a second bellows, and the first bellows and the second bellows define the boundary therebetween and are provided respectively In the exhaust gas circulation area and the exhaust gas emission area, within a tolerance range, an interval between the upper ends of the first and second wind boxes and a bottom surface of the transport vehicle may be between 0 mm and 100 millimeters and not including 0 millimeters but within a range of 100 millimeters.

In this case, at the boundary between the exhaust emission area and the exhaust gas circulation area, a gas blocking structure is provided at the first and second wind boxes, and between the first and second wind boxes, In order to reduce the gap between the bottom of the transport cart and the bellows, more specifically the gap between the bottom of the transport cart and the upper ends of the first and second bellows. In this regard, the configuration of the gas barrier structure may be the same as or similar to that of the gas barrier structure according to the above-mentioned embodiment of the present invention. The remaining components of the exhaust gas treatment device in this embodiment may be similar to or the same as the remaining components of the above embodiment of the present invention.

The gas barrier structure according to the second embodiment of the present invention may include various modifications. In this regard, the configuration and operation of the modified gas barrier structure according to the second embodiment of the present invention may be the same as or similar to the configuration and operation of the modified gas barrier structure according to the first embodiment of the present invention.

FIG. 8 is a schematic diagram showing an exhaust gas flow for a gas suction array according to a comparative example. In this regard, the gas suction array according to the comparative example does not have a gas barrier structure, and therefore, as in the conventional method, a gap between the gas suction array and the transportation vehicle is, for example, greater than 100 mm.

Referring to FIG. 8, in this comparative example, there is no gas blocking structure, so that the exhaust gas can flow back through the boundary between the exhaust emission region and the exhaust gas circulation region. In addition, the exhaust gas passing through the raw material layer can be concentrated on the exhaust gas circulation area which is a high negative pressure area. Therefore, when such flow disturbance occurs, the exhaust gas suction amount of the main blower communicating with the exhaust gas discharge area is reduced, and therefore, the process efficiency can be reduced.

For example, with regard to a conventional sintering machine, there is a clearance between the bellows and the transport vehicle sufficient to allow the exhaust gas to flow therethrough, as shown in FIG. 8. When a sintering exhaust gas circulation method is applied to a sintering machine having such a structure and the firing area of the sintering machine is increased, exhaust gas control cannot be reliably achieved with a single blower, and therefore, an additional blower must be installed. When multiple blowers are operated, the exhaust gas can flow back through the gap defined above, and the exhaust gas control efficiency can be reduced. In operating a sintering machine of one of these blowers, there should be no exhaust gas transfer between the bellows connected to different blowers, so that exhaust gas control can be effectively performed.

In an embodiment of the present invention and a modification thereof, a sintering machine using one of two or more blowers may use a gas blocking structure to efficiently control exhaust gas. As an example to show the effect of the gas barrier structure according to the embodiment of the present invention, the gas suction array in the comparative example and the embodiment of the present invention will be compared. The exhaust gas flow is numerically analyzed and its results will be stated.

FIG. 9 is a diagram illustrating numerical analysis of exhaust gas flow in a gas suction array according to an embodiment of the present invention and a comparative example. (A) of FIG. 9 shows a numerical analysis result of one of the exhaust gas flows inside the gas suction array at the boundary between the exhaust gas emission area and the exhaust gas circulation area according to the comparative example. FIG. 9 (b) shows a numerical analysis result of one of the exhaust gas flows inside the gas suction array at the boundary between the exhaust emission area and the exhaust gas circulation area according to an embodiment of the present invention. (C) of FIG. 9 shows that according to the first modification of the present invention, when a gas barrier structure including a gas barrier body and a fin is used, the gas extraction at the boundary between the exhaust gas emission area and the exhaust gas circulation area Numerical analysis of one of the exhaust gas flows inside the suction array.

That is, (a) to (c) of FIG. 9 show the flow analysis results of the exhaust gas flow based on the presence or absence of the gas blocking body and the presence or absence of the fins. In this regard, a pressure difference between the main blower 452 and the circulation blower 451 is set to 200 millimeters of water (mmAq), and the circulation blower 451 has a relatively high negative pressure. In the comparison between (a) and (b) of FIG. 9, regarding the comparative example, it can be confirmed that the exhaust gas from the exhaust gas emission area is forcedly returned to the exhaust gas circulation area, and regarding the embodiment of the present invention, It can be seen that such exhaust gas backflow is significantly reduced.

In this regard, the exhaust gas flowing back to the exhaust gas circulation area is significantly weakened, but a part of the exhaust gas on the exhaust gas blocking structure still deflects toward the exhaust gas circulation area. In this regard, such a biased flow of exhaust gas flow can begin inside the transport vehicle. This is because the raw material layer in the transport vehicle has voids, and the exhaust gas in the raw material layer can easily divert toward the exhaust gas circulation area through these gaps.

At the same time, since the transport vehicle remains running, the gas barrier structure must be spaced a certain distance from the bottom of the transport vehicle. From the inside of the raw material layer, the biased exhaust gas can flow into the exhaust gas circulation area along the top surface of the gas barrier structure. In a modification of the present invention, in order to prohibit or prevent the bias flow, the gas blocking structure has fins. The fins extend in the direction of travel of the transport vehicle. Use this tab knot Structure, the exhaust gas flow along the gas barrier structure and on the gas barrier structure will not be biased, but is divided into the exhaust gas discharge area and the exhaust gas circulation area substantially equally.

In the comparison between (b) and (c) of Fig. 9, it can be seen that the gas barrier structure with the gas barrier body and the fin is more effective than the gas barrier structure with the gas barrier body only Exhaust gas flows back. That is, the modified gas barrier structure according to the present invention may further include fins to more effectively suppress exhaust gas from flowing back. As such, the inventors have confirmed that the embodiments of the present invention and their modifications effectively suppress exhaust gas backflow. On the other hand, in order to check whether at least one of the gas-blocking body of the present embodiment of the present invention and the modified fins of this embodiment prohibits the backflow of exhaust gas, the change in the amount of exhaust gas at the gas-blocking body and the fins is measured. .

According to the comparative example, the embodiment of the present invention, and the modification of the embodiment of the present invention, FIG. 10 shows a photo of the result of performing a reduced-order modeling experiment on the exhaust gas flow inside the gas suction array. (A) of FIG. 10 shows a photograph of one of the results of the reduced-order modeling experiment according to the comparative example. Fig. 10 (b) shows a photo of one of the results of a reduced-order modeling experiment according to an embodiment of the present invention. Fig. 10 (c) shows a photo of one of the results of a model reduction experiment performed on a gas barrier structure having a gas barrier body and a single fin according to a first modification of the present invention.

In this experiment, when the cross-sectional area of an upper end of an air box is set to 1, the extension length of the fin is set to 2/3. For the reduced-order modeling experiment, a geometric reduced-order model is prepared to model an internal structure of each gas suction array corresponding to each of the comparative example, the embodiment of the present invention, and the modifications of the embodiment of the present invention. Modeling model. Each experiment was performed on each reduced-order model using the sintering conditions of the sintering machine.

Figure 11 shows the results of the reduced-order modeling experiment. FIG. 11 shows a table indicating the results of a reduced-order modeling experiment performed on the exhaust gas flow in the gas suction array according to the comparative example, the embodiment of the present invention, and the modification of the embodiment of the present invention. In this regard, in Figure 11, the comparative example corresponds to According to the results of the reduced-order modeling experiment of the comparative example of the present invention, Example 1 corresponds to the results of the reduced-order modeling experiment according to the embodiment of the present invention, and Example 2 corresponds to the gas barrier containing gas barrier according to the first modification of the present invention. The results of the reduced-order modeling experiments on the barrier structure of the body and the single fin.

With reference to these results, it can be seen that, in Example 1 having a gas-blocking body, the exhaust gas flow rate can be reliably maintained compared to the comparative example. It can be seen that, regarding Example 2 which further includes fins, compared with the comparative example, the exhaust gas flow rate in the exhaust gas circulation region is increased by 12%, and the total flow rate is increased by 11%. In other words, the gas blocking structure including only the gas blocking body can maintain the flow rate of the exhaust gas while suppressing the flow interference. A gas barrier structure including fins can simultaneously suppress flow interference and improve exhaust gas flow rate.

The reason why the existence of the fins can increase the total exhaust gas flow rate and the exhaust gas flow rate to the exhaust gas circulation region is as follows. Since the flow interference between the exhaust gas emission area and the exhaust gas circulation area is effectively suppressed or prevented by the fins, the exhaust gas can be sufficiently sucked from the raw material layer in the exhaust gas circulation area having a relatively high ventilation resistance.

Specifically, the negative pressure in the exhaust gas circulation area is not disturbed by the negative pressure in the exhaust gas discharge area. Therefore, in the exhaust gas circulation area with a higher ventilation resistance, the negative pressure in the exhaust gas circulation area acts on all or most of the raw material layer. This enables the exhaust gas flow rate in the exhaust gas circulation area to be increased, and at the same time enables the exhaust gas to be smoothly sucked in the exhaust gas discharge area. This can increase the overall exhaust gas flow rate.

In the following, a method for treating exhaust gas using an exhaust gas treatment apparatus according to an embodiment of the present invention is explained. Generally, the exhaust gas treatment method may include: loading a raw material into a transportation vehicle, and heat-treating the material in the transportation vehicle while moving the transportation vehicle along a plurality of processing areas; using a gas suction The array sucks down one of the transport carts, wherein the gas suction array extends in the moving direction of one of the transport carts and is arranged below the transport carts, The gas suction array has an exhaust gas circulation area and an exhaust gas discharge area that are separated from each other; and inhibits gas from flowing from a lower negative pressure area of the exhaust gas circulation area and the exhaust gas discharge area to the gas suction array and the In a space between delivery cars.

In this regard, the step of inhibiting the flow of the gas from the lower negative pressure region into the space includes using a gas barrier structure disposed at a boundary between the exhaust gas circulation region and the exhaust gas emission region. .

First, the raw materials are supplied to the raw material hopper. In this regard, the raw materials are prepared by mixing and humidifying fine iron ore, limestone, fine coke, and anthracite and granulating them to a few millimeters. The prepared raw materials are loaded into a raw material funnel. In this regard, a sintered ore having a predetermined particle diameter is selected as the upper sintered ore, and the selected upper sintered ore is loaded into the upper sintered ore funnel.

Subsequently, the raw materials are loaded on a delivery vehicle. The raw materials are heat-treated while moving the transport vehicle along these processing areas.

Specifically, the heat treatment process includes: running a transport vehicle in an array direction of a plurality of processing areas; loading the raw material into the transport vehicle using a raw material hopper; and igniting the raw material with an igniter to ignite the raw material inside the transport vehicle. Forming a combustion cavity; and sintering the raw material while moving the combustion cavity from the upper end to the lower portion in the inner space of the transport vehicle.

More specifically, when the raw materials and the upper sintered ore are fed to the corresponding hoppers, respectively, the transport vehicles travel along the transport path in the array direction of the plurality of processing zones. Then, in the loading area in the processing area, the upper sintered ore is placed on the bottom of the transport vehicle, and then, the raw material is placed on the top surface of one of the upper sintered ore, thereby forming a raw material layer.

When the raw material layer is formed, the raw material layer is sequentially moved along the ignition area and the sintering area. move. In the ignition zone, the raw material layer is ignited to form a burning cavity therein. Then, in the sintering zone, while the combustion cavity is moved from the upper material layer to the lower material layer in the raw material layer, the raw material layer is heat-treated at a high temperature of about 1300 ° C to 1400 ° C, thereby forming a sintering. ore.

While performing the above heat treatment process, a gas suction array is used to suck the gas inside the transport vehicle, and some of the exhaust gas is circulated through the transport vehicle and the remaining gas is discharged. The gas suction array is disposed below the bottom of the transport cart and extends in the direction of the transport cart. The gas suction array is divided into an exhaust gas circulation area and an exhaust gas discharge area. The gas suction array may be a gas suction array as described above in the exhaust gas treatment apparatus according to the embodiment of the present invention. With this gas suction, the combustion cavity can be moved from the upper end to the lower part of the raw material layer, so that the raw material is completely sintered.

While suctioning the inside of the transport cart, it can perform backflow suppression operation. The backflow suppression operation may include suppressing the flow of gas from a lower negative pressure region of the exhaust gas circulation region and an exhaust gas emission region to one of the exhaust gas circulation region and an exhaust gas emission region through a space between the gas suction array and the transport vehicle. High negative pressure area. In this regard, inhibiting the flow of gas from the lower negative pressure region to the higher negative pressure region may include using a gas barrier structure as defined above, which is disposed at a boundary between the exhaust gas circulation region and the exhaust gas emission region.

As described above, in the operation of suppressing the backflow of exhaust gas by using the gas blocking structure, at least one rib protruding upward from the fin of the gas blocking structure may be used to more effectively suppress the exhaust gas flow on the upper surface of one of the fins .

On the other hand, the use of the gas blocking structure according to the embodiment and the use of the fins and the ribs modified according to the embodiment have been explained several times to suppress or prevent the exhaust gas from flowing back. Therefore, to avoid repetition, this will not be described again.

The finished sintered ore is discharged to the crushing unit at the end of the conveying path. The discharged sintered ore is crushed into a predetermined particle size by a crushing unit. The crushed ore is screened by a screening machine. Depending on the particle size, the screened ore can be fed to a blast furnace process (which is a subsequent process), or alternatively, it can be used as an upper sinter ore, or the other option can be considered as Ore is recycled for reuse as raw material.

According to an embodiment of the present invention, a gap between a gas suction array and a transport vehicle at a boundary may be reduced by using a gas barrier structure provided at a boundary between an exhaust gas circulation area and an exhaust gas discharge area. Therefore, during the production of the sintered ore and the circulation of the exhaust gas, it is possible to suppress or prevent the gas from flowing back due to the negative pressure difference between the emission area and the circulation area at the boundary between the emission area and the circulation area. Therefore, the flow rate of the exhaust gas can be stably maintained during operation.

According to a modification of the present invention, the gas blocking structure has a fin or a combination of a fin and a rib, so that both the total flow rate of the exhaust gas and the flow rate of the exhaust gas to be circulated can be increased, thereby further improving the operation. Efficient and obtain high quality sintered ore.

The above embodiments of the present invention are only used to illustrate the present invention, but not to limit the present invention. The features presented in the above embodiments of the present invention may be combined with each other or replaced with each other to form various modifications. It should be noted that such modifications may be considered to fall within the scope of the present invention. Within the scope of the patent application and its equivalent, the present invention will be implemented in various forms. Those skilled in the art will appreciate that various embodiments are possible within the scope and spirit of the invention.

Claims (15)

An exhaust gas treatment device includes a gas-suction array extending in a moving direction of a truck and disposed below the truck. The truck is configured to accommodate a raw material. Simultaneously moving along a plurality of processing regions, wherein the gas suction array has an exhaust-gas circulation region and an exhaust-gas discharging region that are separated from each other; and a gas-blocking structure (gas- A blocking structure) is disposed at a boundary between the exhaust gas circulation area and the exhaust gas emission area to reduce a gap between the gas suction array and the transport vehicle at the boundary, wherein the gas blocking structure includes: A gas-blocking body extending in a direction that intersects the moving direction of the transport vehicle; a flap extending from the gas-blocking body in the direction of travel of the transport vehicle; and Formed as at least one rib protruding upward from a top surface of one of the fins. The exhaust gas treatment device according to claim 1, wherein the gas suction array includes a plurality of wind boxes arranged along the moving direction of the transport vehicle, wherein the wind boxes each have a suction along the gas The suction array extends a plurality of upper ends arranged side by side, wherein the upper ends are coupled to each other, wherein the gas blocking structure is disposed in the bellows adjacent to the boundary between the exhaust gas circulation area and the exhaust gas emission area. Some bellows are on adjacent upper ends, and adjacent bellows define the boundary therebetween. The exhaust gas treatment equipment according to claim 1, wherein a distance between a top surface of the gas barrier structure and a bottom surface of the transport vehicle is within 0 millimeters (mm) within an error range at the boundary. 100 millimeters and not including 0 millimeters but within a range of 100 millimeters. An exhaust gas treatment equipment comprising: a plurality of bellows arranged along a moving direction of a transport vehicle and disposed below the transport vehicle, wherein the transport vehicle is arranged to accommodate a raw material while moving along a plurality of processing areas, wherein The isobar has an exhaust gas circulation area and an exhaust gas emission area separated from each other; and a gas blocking structure, which is disposed at a boundary between the exhaust gas circulation area and the exhaust gas emission area to reduce the transport vehicle at the boundary. A gap with some of the bellows, in which some of the upper ends of the bellows protrude more upwards than the upper ends of the rest of the bellows, in which the bellows Some of them are adjacent to the boundary between the exhaust gas circulation area and the exhaust gas emission area; wherein the gas blocking structure includes: a gas blocking body in a direction crossing the moving direction of the transport vehicle Extending; a wing extending from the gas blocking body in the direction of travel of the transport vehicle; and at least one rib formed to protrude upward from a top surface of the wing. The exhaust gas treatment equipment according to claim 4, wherein some of the bellows include a first bellows and a second bellows, and the first bellows and the second bellows are in between The boundary is defined, and is respectively disposed in the exhaust gas circulation area and the exhaust gas emission area, wherein within an error range, the upper end of the first wind box and the second wind box and one of the transport vehicles An interval between the bottom surfaces may be in a range of 0 mm to 100 mm and not including 0 mm but including one of 100 mm. The exhaust gas treatment device according to claim 5, wherein the gas blocking structure is provided at the upper ends of the first wind box and the second wind box, and between the upper end of the first wind box and the second wind box Between the upper ends of the bellows to reduce the gap between the transport vehicle and the some of the bellows at the boundary. The exhaust gas treatment device according to any one of claims 1 to 6, wherein the fins extend from at least one of an upper end and a lower portion of the gas blocking body or from the upper end of the gas blocking body A portion extending from the lower portion. The exhaust gas treatment equipment according to any one of claims 1 to 6, wherein the fins are provided in at least one of the exhaust gas circulation area and the exhaust gas emission area. The exhaust gas treatment equipment according to any one of claims 1 to 6, wherein the fins are disposed in a lower negative pressure region of the exhaust gas circulation region and the exhaust gas emission region. The exhaust gas treatment apparatus according to any one of claims 1 to 6, wherein when a cross-sectional area of an upper end of a bellows facing one of the fins is set to 1, an extension length of one of the fins is greater than 0 and less than or equal to 2/3. The exhaust gas treatment device according to any one of claims 1 to 6, wherein the ribs extend in the moving direction of the transport vehicle; or the ribs can be in a direction crossing the moving direction of the transport vehicle extend. The exhaust gas treatment device according to claim 11, wherein the gas blocking structure includes a plurality of ribs, wherein some of the ribs extend in the direction of travel of the transport vehicle, and the rest of the ribs The operator extends in a direction that intersects the moving direction of the transport vehicle. The exhaust gas treatment device according to any one of claims 1 to 6, wherein the gas blocking structure further includes a tip portion, the tip portion is from a distal end of the fin at the gas blocking structure The gas blocking body protrudes downward in an oblique manner to one of the ends of the fin. The exhaust gas treatment equipment according to claim 13, wherein when a cross-sectional area of an upper end of a bellows facing one of the fins is set to 1, the fin and the fin in the moving direction of the transport vehicle The sum of the extensions of the tip portions is greater than 0 and less than or equal to 2/3. An exhaust gas treatment method includes: loading a raw material into a transport vehicle, and heat-treating the raw material in the transport vehicle while the transport vehicle is moved along a plurality of processing areas; The interior of one of the transport vehicles is sucked downward, wherein the gas suction array extends in a moving direction of the transport vehicle and is disposed below the transport vehicle, wherein the gas suction array has an exhaust gas circulation area and a An exhaust gas discharge area; and inhibiting the flow of gas from the exhaust gas circulation area and a lower negative pressure area of the exhaust gas discharge area into a space between the gas suction array and the transport vehicle, wherein the gas is inhibited from flowing from the gas The step of flowing the lower negative pressure region into the space includes using a gas barrier structure disposed at a boundary between the exhaust gas circulation region and the exhaust gas emission region, wherein the gas is inhibited from flowing from the gas The step of flowing the lower negative pressure region into the space includes using at least one raised rib which protrudes upward from a top surface of the gas barrier structure to avoid the The top surface of the barrier body structure of the flow of the gas.