CN109844435B - Exhaust gas treatment device and treatment method - Google Patents

Abstract

The present invention provides an exhaust gas treatment device and an exhaust gas treatment method applied to the exhaust gas treatment device, the device including: a suction unit extending from a lower portion of the trolley in the traveling direction of the trolley and having circulation areas and discharge areas separated from each other zone, the trolley is mounted to be able to process the material while traveling along multiple sections; and a blocking member mounted at the boundary between the circulation area and the discharge area to seal the gap between the trolley and the suction member, by In this way, it is possible to suppress or prevent the exhaust gas flow from interfering with each other due to the negative pressure difference between the various sections in the apparatus.

Description

Exhaust gas treatment device and treatment method

technical field

The present disclosure relates to an exhaust gas treatment apparatus and treatment method, and more particularly, to an exhaust gas treatment apparatus and treatment method capable of suppressing or preventing interference between exhaust gas flows due to differences between negative pressures in a plurality of regions of a facility.

Background technique

Sinter is produced from fine iron ore, limestone, coke and anthracite, which is then loaded into blast furnaces. In blast furnace processing for the production of molten iron, sinter is loaded into the blast furnace along with iron ore and coke. The sinter production process sinters fine iron ore to a size suitable for use in blast furnaces. The sinter production process includes preparing a mixture of raw materials and thermally treating the mixture into sinter. The heat treatment of the mixture into sinter is usually carried out in a sintering machine.

The process of producing sintered ore by heat-treating the mixture of raw materials is performed as follows: The mixture of raw materials is loaded onto the sintering truck at a constant height while the truck is moving in the direction in which the sintering machine extends. The surface layer of the mixture of feedstocks is ignited by an ignition unit to form a raceway or combustion zone. Using an exhaust gas treatment device, air is forced downward into the sintering trolley to move the swirl zone downward to sinter the mixture of raw materials, ie, to produce sintered ore. The sinter is then crushed and cooled via crushers and coolers arranged in the unloading area of the sinter. The crushed and cooled sinter is divided into 5mm to 50mm pellets suitable for use in a blast furnace and then transferred to the blast furnace.

The sintering exhaust gas recycling technology for improving the function of sintering machines and saving energy was announced by Kinsey at AIME in the United States in 1975. In this publication, an on-machine cooling type sintering machine is proposed, which has a structure in which the length of the sintering machine is extended and a cooling machine is added to the sintering machine. This configuration includes a sintering zone and a cooling zone. Gases are pumped separately from the sintering zone and the cooling zone. Therefore, an energy-saving sintering model is proposed by circulating the high-temperature exhaust gas discharged from the cooling area into the sintering area as hot air. Subsequently, during the 1970s and 1980s, similar studies or patent applications were filed in Japan and Europe.

When the sintering exhaust gas recycling technology is applied to the sintering machine treatment, the energy required for sintering can be reduced by recovering the sensible heat of the exhaust gas for sintering. After the first oil crisis, in Utayama Prefecture, Japan in 1984, 4-sintering was improved via an on-board cooling type sintering machine, and then the air in the cooling section of the sintering machine was recirculated to be reused as sintering air. In addition, in Kyushu and Kashima, the exhaust gas from the cooler is circulated to the sintering machine using the sintering exhaust gas recycling technology. At NKK in 1991, in order to increase the suction capacity and thus the productivity of Fukuyama 4-sintering, a second blower was installed, and the exhaust gas recovered by the second blower was recirculated towards the sinter discharge unit of the sintering machine, thereby passing through the The boiler in the sintering machine improves the sensible heat recovery capacity and at the same time increases the gas suction capacity.

The above-mentioned method aims at reducing the amount of waste gas by transferring the sensible heat of the waste gas to the sintered layer or the ignition furnace, and at the same time aiming at saving energy. To this end, the sintering exhaust gas recycling technology is applied to the sintering machine process.

Meanwhile, due to the implementation of environmental policies and regulations, investment and operating costs of processing equipment for processing sulfur oxides SOx and nitrogen oxides NOx have recently become a burden. Therefore, steel mills in every country are responding to greenhouse gas regulations and reducing energy consumption by maximizing the recovery of exhaust gases from sintering machines, while reducing investment costs for pollution prevention equipment.

For example, NSC's Kitakyushu 3-Sintering in 1992 reduced the amount of exhaust gas by 28% by improving the sintering machine to reduce the amount of exhaust gas while maintaining the productivity and quality of the sinter. In 1994, Lurgi in Germany developed the EOS (Emission Optimized Sintering) technology and applied the EOS technology to the Hoogovens sintering plant in the Netherlands to reduce the amount of exhaust gas by about 40%. These cases are suitable for compliance with international environmental regulations, but the technology for these cases is not yet complete.

In addition, since 1994, NSC's FUTSU Process Laboratory, Austria's Voest-Alpine, Australia's BHP and Italy's Centro Sviluppo Materiali (CSM) have been working on adapting sintering processes to environmentally friendly processes. Sumitomo Corporation is working on a two-stage ignition sintering method in which, in an on-board cooling type sintering machine, raw materials are individually loaded into the upper and lower stages, and the materials in the upper and lower stages are ignited and sintered, wherein the material from the upper stage is ignited and sintered. The waste gas is reused for sintering the material of the lower table.

In order to improve the productivity of sintering ore, there are methods of increasing the capacity of the blower in the exhaust gas treatment device to increase the sintering air volume, and methods of increasing the sintering air volume by enlarging the firing area of the sintering machine. In this regard, when the blower capacity of the exhaust gas treatment device is increased, the machine for cleaning the exhaust gas must be further extended, and further, the maintenance cost of the exhaust gas treatment device increases.

Therefore, POSCO's Pohang 4-Sintering has introduced sintering exhaust gas recycling technology. In this regard, in order to cope with the increasing demand for sinter ore due to the increase in the internal capacity of the blast furnace and the high tapping process, the firing area of the sintering machine is lengthened and the sintering air flow is correspondingly increased. Therefore, in order to cope with the increase in sintering air flow, another blower for exhaust gas circulation was added to the exhaust gas treatment device.

In this regard, when the position where the ventilation resistance of the sintered layer is the largest is defined as the exhaust gas suction position, the additional blower uses high pressure to suck the exhaust gas at the above-mentioned limited position, and the consumption of oxygen for the exhaust gas toward the sintered layer is relatively small. backend supply. Since the exhaust gas sucked into the additional blower is circulated towards the top surface of the sintered layer, the total amount of exhaust gas can be kept constant. Therefore, even when the firing area of Pohang 4-Sintering is increased and a blower is added to the exhaust gas treatment device, the existing structure related to the exhaust gas cleaning in the exhaust gas treatment device can be used without modification.

(Related technical documents)

(patent literature)

(Patent Document 1) KR10-2002-0014877 A

(Patent Document 2) KR10-2016-0079240 A

(Non-patent literature)

(Non-Patent Document 1) F.W. Kinsey of Dravo, "Design parameters for strand cooling", AIME, Vol. 34, Ironmaking proceeding, p. 85, (1975)

(Non-Patent Document 2) D. Schlebusch, F. Cappel, "Optimization of pollution control in sinter plant", The 6th International Symposium on Sintering, pp. 403 to 408, Nagoya, Japan, (1993 )

SUMMARY OF THE INVENTION

technical purpose

The present disclosure provides an exhaust gas treatment apparatus and method that can suppress or prevent interference between exhaust gas flows due to differences between negative pressures in various regions of the facility.

The present disclosure provides an exhaust gas treatment apparatus and method that can suppress or prevent interference between exhaust gas flows of equipment, thereby improving the treatment efficiency of the equipment.

technical solutions

According to an exemplary embodiment, an exhaust gas treatment device includes a gas suction array extending in a direction of travel of the trolley and disposed below the trolley, the trolley being configured to move along a plurality of zones while treating the feedstock, wherein, The gas suction array has an exhaust gas circulation area and an exhaust gas discharge area separated from each other; and a gas blocking structure, the gas blocking structure is provided at the boundary between the exhaust gas circulation area and the exhaust gas discharge area to seal the gap between the gas suction array and the trolley. interval at the boundary.

The gas suction array may comprise a plurality of bellows arranged in the direction of travel of the trolley, wherein the bellows respectively have upper ends arranged side by side along an extension of the gas suction array, wherein the upper ends are coupled to each other, wherein in adjacent In the case where the boundary between the exhaust gas circulation area and the exhaust gas discharge area is defined between the bellows, the gas blocking structure is provided on the adjacent upper ends of some bellows adjacent to the boundary among the plurality of bellows.

The gap at the boundary between the top surface of the gas barrier structure and the bottom surface of the trolley is greater than 0 and less than or equal to 100 mm within a tolerance range.

According to an exemplary embodiment, an exhaust gas treatment device includes a plurality of bellows arranged in a direction of travel of the trolley and disposed below the trolley, wherein the trolley is configured to move along a plurality of areas while processing the feedstock, wherein , the plurality of bellows has an exhaust gas circulation area and an exhaust gas discharge area separated from each other, wherein the upper ends of some bellows of the plurality of bellows protrude more upwardly than the upper ends of the remaining bellows of the plurality of bellows, wherein, Some of the plurality of bellows are adjacent to the boundary between the exhaust gas circulation area and the exhaust gas discharge area.

Some of the bellows include a first bellows and a second bellows, and the first bellows and the second bellows define a boundary therebetween, the first bellows and the second bellows being disposed in the exhaust gas circulation area and the exhaust gas discharge area, respectively , wherein the gap between the upper end of the first bellows and the upper end of the second bellows relative to the bottom surface of the trolley may be greater than 0 and less than or equal to 100 mm within the tolerance range.

The exhaust gas treatment device further includes a gas blocking structure disposed at the upper end of the first bellows and the upper end of the second bellows to seal gaps at boundaries between the trolley and some of the bellows.

The gas blocking structure may include a gas blocking body extending in a direction intersecting the traveling direction of the trolley and a flap protruding from the gas blocking body in the traveling direction of the trolley.

The baffle may extend from at least one of the upper end and the lower portion of the gas barrier or from a portion between the upper end and the lower portion of the gas barrier. A baffle may be provided in at least one of the exhaust gas circulation area and the exhaust gas discharge area. The baffle may be provided in a lower negative pressure region of the exhaust gas circulation region and the exhaust gas discharge region. When the sectional area of the bellows facing the upper end of the baffle is set to 1, the extension length of the baffle may be greater than 0 and less than or equal to 2/3.

The gas blocking structure may further include at least one rib formed to protrude upward from the top surface of the baffle. The ribs may extend in the direction of travel of the cart; or the ribs may extend in a direction intersecting the direction of travel of the cart. The gas barrier structure may include a plurality of ribs, wherein some of the plurality of ribs may extend in the direction of travel of the cart and remaining ribs of the plurality of ribs may be in a direction intersecting the direction of travel of the cart extend.

The gas barrier structure may further comprise a tip protruding downwardly from the distal end of the baffle in an oblique manner in a direction from the body of the gas barrier structure to the end of the baffle. When the cross-sectional area of the bellows facing the upper end of the baffle is set to 1, the sum of the extension lengths of the baffle and the tip in the traveling direction of the trolley may be greater than 0 and less than or equal to 2/3.

According to an exemplary embodiment, an exhaust gas treatment method includes: loading feedstock into a trolley and thermally treating the feedstock in the trolley while moving the trolley along a plurality of zones; and using a gas suction array to draw down the interior of the trolley, wherein , the gas suction array extends in the traveling direction of the trolley and is arranged below the trolley, wherein the gas suction array has an exhaust gas circulation area and an exhaust gas discharge area separated from each other; and suppresses the exhaust gas from the exhaust gas circulation area and the exhaust gas discharge area The lower negative pressure area flows into the space between the gas suction array and the trolley.

Suppressing the flow of exhaust gas from the lower negative pressure region into the space may include using a gas barrier structure provided at a boundary between the exhaust gas circulation region and the exhaust gas discharge region.

favorable effect

According to the exemplary embodiment of the present disclosure, it is possible to suppress or prevent interference between exhaust gas flows due to differences between negative pressures in a plurality of regions of the apparatus, thereby improving the treatment efficiency of the apparatus.

For example, when the embodiment of the present disclosure is applied to a sinter production process, the gas blocking structure is disposed in the traveling direction of the trolley in the case where the adjacent bellows define the boundary between the exhaust gas circulation area and the exhaust gas discharge area on the adjacent upper end of the bellows adjacent to the boundary among the plurality of bellows. When the feedstock is loaded on the trolley, the trolley travels along the plurality of areas while the feedstock is heat-treated, and the gas in the trolley is drawn downward, the gas barrier structure inhibits the flow of gas from the exhaust gas circulation area and the exhaust gas discharge area. The lower negative pressure area flows through the gap between the gas suction array and the trolley to the higher negative pressure area in the exhaust gas circulation area and the exhaust gas discharge area.

Alternatively, the upper ends of some of the plurality of bellows arranged in the traveling direction of the trolley protrude more upward than the upper ends of the remaining bellows of the plurality of bellows, wherein some of the plurality of bellows It is adjacent to the boundary between the exhaust gas circulation area and the exhaust gas discharge area. Furthermore, gas blocking structures may be provided on adjacent upper ends of adjacent bellows. When the feedstock is loaded on the cart, the cart travels along the plurality of zones while the feedstock is being heat-treated, and the gas in the cart is drawn downward, the narrow gap or gas barrier structure can inhibit the passage of gas from the exhaust gas circulation zone and the The area of lower negative pressure in the exhaust gas discharge area flows through the gap between the gas suction array and the trolley to the area of higher negative pressure in the exhaust gas recirculation area and the exhaust gas discharge area.

Therefore, the exhaust gases respectively located in adjacent bellows, which are respectively located in the exhaust gas circulation area and the exhaust gas discharge area, do not interfere with each other at the boundary between the exhaust gas circulation area and the exhaust gas discharge area. Therefore, it is possible to prevent backflow of exhaust gas from the lower negative pressure region of the exhaust gas circulation region and the exhaust gas discharge region to the higher negative pressure region of the exhaust gas circulation region and the exhaust gas discharge region. Therefore, both the circulation flow efficiency and the exhaust flow efficiency of the exhaust gas flow can be improved, and the total exhaust gas flow rate can be improved. As a result, the efficiency of the sinter production process can be improved, and high-quality sinter can be produced.

Description of drawings

1 is a schematic diagram of a feedstock processing facility according to an embodiment of the present disclosure.

2 is a schematic diagram illustrating an exhaust gas treatment apparatus according to an embodiment of the present disclosure.

3 is a schematic diagram of a gas barrier structure according to a first modified embodiment of the present disclosure.

4 is a schematic diagram of a gas barrier structure according to a second modified embodiment of the present disclosure.

5 is a schematic diagram of a gas barrier structure according to a third modified embodiment of the present disclosure.

6 is a schematic diagram of a gas barrier structure according to a fourth modified embodiment of the present disclosure.

7 is a schematic diagram of a gas barrier structure according to a fifth modified embodiment of the present disclosure.

8 is a schematic diagram of exhaust gas flow for a gas extraction array according to a comparative embodiment.

9 is a graph illustrating a numerical analysis of exhaust gas flow in gas pumping arrays in accordance with embodiments of the present disclosure and comparative examples.

10 shows a photograph of the results of a simplified simulation experiment performed on exhaust gas flow within a gas pumping array according to a comparative example and an embodiment of the present disclosure.

11 shows a table representing the results of a simplified simulation experiment performed on exhaust gas flow in a gas pumping array according to a comparative example and an embodiment of the present disclosure.

Detailed ways

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings. However, the present disclosure is not limited to the embodiments described below, but may be implemented in various forms. The embodiments of the present disclosure may be set forth to allow for completion of the description of the present disclosure and to convey the scope of the present disclosure to those skilled in the art. The figures may be exaggerated to illustrate embodiments of the present disclosure. The same reference numerals refer to the same elements throughout the drawings.

In terms used to describe embodiments of the present disclosure, "upper" or "lower" refers to the upper or lower portion of a component. In addition, "above" or "below" is used to indicate a space that is in direct or indirect contact with the upper or lower part of the component.

The present disclosure provides exhaust gas treatment devices and methods configured to allow flow disturbances between the circulating flowing gas and the exhausting flowing gas to be suppressed in the sintering machine during the flow of the exhaust gas in the sintering machine, wherein the circulating flowing gas and the Flow disturbances between the exhausted flowing gases would otherwise occur due to differences between the negative pressures in various regions of the plant, eg in the bellows. Hereinafter, embodiments will be described in detail with reference to a sinter production process at a steel mill. Obviously, the present disclosure may be equally applicable to exhaust gas flow control of various treatment plants.

In explaining the embodiments of the present disclosure, the raw material processing apparatus according to the embodiments of the present disclosure is first described in order to clearly understand the present disclosure. With reference to the raw material treatment apparatus, the exhaust gas treatment apparatus and method according to the embodiments of the present disclosure will be described in detail.

FIG. 1 is a schematic diagram of a raw material treatment facility to which an exhaust gas treatment apparatus according to an embodiment of the present disclosure is applied. 2 is a schematic diagram illustrating a gas suction array and a gas barrier structure of an exhaust gas treatment device according to an embodiment of the present disclosure.

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

Referring to FIG. 1 , a raw material processing apparatus according to an embodiment of the present disclosure includes a trolley 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 apparatus may acquire the raw material and thermally treat the raw material while sequentially moving the raw material along the plurality of zones. At least a portion of the exhaust gas generated from the plurality of regions may be circulated in at least a portion of the plurality of regions. In the context of this specification, the raw material processing equipment may be a sintering machine. For example, the sintering machine may be a downdraft sintering machine having an exhaust gas recirculation configuration.

The cart 10 may be configured to allow heat treatment of the feedstock in the cart 10 in the plurality of zones. The raw material processing apparatus includes a plurality of trolleys that may be continuously arranged and coupled together in the extending direction of the raw material processing apparatus. The cart 10 may be configured to travel in the arrangement direction of the plurality of regions. The trolleys 10 are open at the top of the trolleys and thus are loaded with material within the interior space in each trolley. The interior space of each of these trolleys corresponds to a heat treatment space. Raw materials can be loaded inside the cart 10 .

The bottom portion 11 of the trolley 10 may have a configuration in which the elongated bars (grate bars) are arranged in a grid structure. With this configuration, the inner space of the cart 10 can be in gas communication with the corresponding bellows as described later, whereby the exhaust gas in the inner space can be sucked downward via the bellows.

The upper end of the material processing equipment may define the conveying path of the trolley 10 , and the lower portion of the material processing equipment may define the return path of the trolley 10 . The trolley 10 travels in the first direction along the conveying path, and thus, the raw material loaded in the trolley 10 moves in the first direction while being heat-treated. When the trolley enters the return path, the heat-treated sinter is discharged into a crushing unit (not shown), and then the trolley travels along the return path in a second direction opposite to the first direction and can then return to the conveying path .

The conveying path may include multiple zones. The plurality of regions include: a loading region in which the raw material hopper 21 and the upper sinter ore hopper 22 are positioned; a firing region downstream of the loading region in which the firing furnace 30 is positioned; and a firing region downstream of the firing region Sintered area. The loading area, the ignition area, and the sintering area may be sequentially arranged along the moving direction of the raw material.

A loading area may be located upstream of the conveying path where the material begins to move in the conveying path. In the loading area, the raw material is loaded in the inner space of the trolley 10 so that a raw material layer is formed in the inner space of the trolley 10 . The ignition zone is downstream of the loading zone in the direction of movement of the feedstock, and the ignition zone may extend in the direction of movement of the feedstock. In the ignition region, the upper end of the raw material layer loaded in the cart 10 (hereinafter, referred to as the upper material layer) is ignited.

In the sintering area, the swirl zone moves from the upper material layer of the raw material layer loaded on the trolley 10 to the lower part of the raw material layer (hereinafter, referred to as "lower material layer"). The sintering zone is a zone for sintering and cooling the raw material layer and is located downstream of the ignition zone in the direction of movement of the raw material. The feedstock in each trolley 10 is subjected to heat treatment while each trolley sequentially moves the feedstock along the loading area, the firing area, and the sintering area, thereby producing sintered ore.

The raw material hopper 21 receives the raw material in the raw material hopper 21 and is located above the trolley 10 in the loading area. The raw material hopper 21 may be provided with a loading chute and a drum feeder at the bottom opening of the raw material hopper 21 and thus the raw material may be loaded in the trolley 10 . In this regard, the raw material may undergo vertical separation through the hopper 21 prior to loading.

Raw materials may include raw materials for sinter production. For example, by mixing, humidifying, and pelletizing the iron source, additives, and solid fuel, the feedstock can have particle sizes on the order of several millimeters. In this regard, the iron source is a source having an iron component, and the iron source may include iron ore and fine iron ore. The additive may include limestone as the calcium carbonate-containing material. Solid fuels may include coal-based solid fuels including coke fines and anthracite.

The upper sinter hopper 22 is located in the loading area and upstream of the raw material hopper 21 in the direction of movement of the raw material. The upper sintered ore can be provided by selecting sintered ore with a particle size of, for example, 8 mm to 15 mm, from the sintered ore. The upper sinter may be loaded into the inner space of the trolley 10 before the raw material is loaded into the inner space of the trolley 10 , so that the raw material is prevented from adhering to the bottom of the trolley 10 or from downwardly passing through the defined in the bottom of the trolley 10 . gap.

The ignition furnace 30 is spaced apart from the raw material hopper 21 in the direction of travel of the trolley 10 . The ignition furnace 30 may be located above the cart 10 . That is, the ignition furnace 30 may be positioned downstream of the raw material hopper 21 in the ignition region of the conveying path in the direction of travel of the trolley 10 . The ignition furnace 30 is configured to spray the 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 may ignite the solid fuel included in the upper material layer.

The exhaust gas treatment device 400 according to an embodiment of the present disclosure may be configured to draw gas downwardly from the interior space of the cart 10 and be heat-treated in the interior space of the cart 10 as the feedstock moves along the plurality of regions at each cart while circulating at least a portion of the suction gas between the plurality of zones.

1 and 2, an exhaust gas treatment device 400 according to an embodiment of the present disclosure may include a gas barrier structure 413, a gas suction array, a gas ventilation pipe 420, an exhaust gas circulation mechanism, and an exhaust gas discharge mechanism.

A gas suction array may be provided on the bottom of the trolley 10 and extend in the direction of trolley travel of the trolley 10 . For example, the gas suction array may extend in the direction of travel of the cart 10 with the top end of the gas suction array wrapping the bottom of the cart 10 . More specifically, the gas suction array may include a plurality of bellows 410 arranged along the direction of carriage travel of the carriage 10 . Adjacent bellows of the plurality of bellows 410 may have adjacent upper ends arranged side by side with each other in the extending direction of the gas suction array. Each of the plurality of bellows 410 is in gas communication with the inner space of the corresponding trolley 10 via a gap defined in the bottom 11 of the corresponding trolley 10 . Each of the plurality of bellows 410 generates a negative pressure in the inner space of the corresponding trolley, so as to suck the gas in the inner space of the corresponding trolley 10 downward, thereby allowing the swirl zone in the raw material layer from The upper material layer of the feedstock is transferred to the lower material layer of the feedstock. During this process, exhaust gas is collected into the plurality of bellows 410 .

After the carts 10 are subjected to ignition from the firing furnace 30, each cart travels in the first direction and along the gas suction array. In this regard, the gas suction array generates a suction force in the downward direction within the interior space of the corresponding cart 10 . This suction force enables air outside the carts 10 to flow into the corresponding interior spaces of the carts 10, and then causes the air in the interior spaces to be directed downwards, thereby moving the swirl zone downwards. When the corresponding trolley 10 passes through the sintering area, the swirl area reaches the bottom 11 of the trolley 10, thereby completing the sintering of the raw material layer. The sinter has been cooled as the corresponding trolley 10 moves towards the end of the conveying path. The cooled sinter may be discharged via a sinter discharge device at the end of the conveying path.

The plurality of bellows 410 are separated from the bottom 11 of the cart 10 by a predetermined gap. This is to prevent the moving cart 10 from colliding with the bellows 410 when the plurality of bellows 410 suck the gas in the inner space of the cart downward. In addition, when the corresponding trolley passes through each area, the ventilation resistance in the inner space of the trolley varies based on the sintering state of the raw material at various points in each area. To this end, the plurality of bellows 410 are spaced apart from the bottom 11 of the cart 10 by a predetermined gap so as to effectively suck gas from the inner space of the cart 10 . That is, the adjacent and contacting upper ends of the plurality of bellows 410 are separated from the bottom 11 of the cart 10 by a predetermined distance.

On the other hand, the gas pumping array may have a gas circulation area and a gas discharge area separated from each other. Accordingly, the plurality of bellows 410 may be divided into bellows 411 disposed in the gas circulation area and bellows 412 disposed in the gas discharge area.

The gas circulation area of the gas pumping array may correspond to a portion of the gas pumping array extending from a first point in the sintering area to a second point in the sintering area. In this regard, the first point in the sintering zone may correspond to the point at which the convolution zone in the feedstock layer reaches the bottom 11 of the cart 10 to complete the sintering of the feedstock layer. The second point in the sintering zone may correspond to the point at which the ventilation resistance value of the sintered feedstock layer begins to drop below the predetermined value.

Thus, the gas discharge area of the gas suction array corresponds to the part of the gas suction array extending from the start of the delivery path to the first point in the sintering area as described above and the second point of the gas suction array from the sintering area A combination of parts where a point extends to the end point of a conveying path. That is, the discharge area may correspond to the remainder of the gas pumping array other than the circulation area.

The first and second points in the sintering region as described above are merely for illustrating embodiments of the present disclosure. The present disclosure is not limited thereto. The sintering zone can be configured in various ways depending on the processing requirements. Furthermore, the above-described division between the gas circulation area and the gas discharge area is merely an exemplary configuration among various configurations for circulating the exhaust gas. The gas circulation area and the gas discharge area can be configured in various ways, so that the exhaust gas is discharged and circulated in various ways.

Before describing the gas blocking structure 413 , the gas ventilation duct 420 , the exhaust gas circulation mechanism, and the exhaust gas discharge mechanism of the exhaust gas treatment device 400 according to the embodiment of the present disclosure will be explained first.

The processing device includes a plurality of gas ventilation pipes, and the plurality of gas ventilation pipes are arranged to be spaced apart from each other in the extending direction of the gas suction array. The plurality of gas ventilation pipes may correspondingly communicate with the bottom of the gas suction array, ie, the bottom of the plurality of bellows 410 . The gas ventilation pipe 420 may be divided into a gas ventilation pipe 421 communicating with the bellows 411 provided in the gas circulation area and a gas ventilation pipe 422 communicating with the bellows 412 provided in the gas discharge area.

The exhaust gas circulation mechanism has a first end communicating with some of the gas ventilation pipes 420, eg, the gas ventilation pipes 421 communicating with the bellows 411 provided in the gas circulation area, and facing the plurality of areas the second end at the predetermined location within. Therefore, the exhaust gas circulation mechanism can circulate the exhaust gas drawn from the point where the ventilation resistance of the sintered raw material layer is the largest toward the predetermined point on the plurality of regions.

In this regard, the second end of the exhaust gas circulation means can be open between the first point of the sintering zone and the end point of the conveying path. In one embodiment, the second end of the exhaust gas recirculation mechanism may be open towards a point located downstream of the aforementioned first point in the sintering zone. This means that the second end of the exhaust gas recirculation means is open towards the downstream point of the sintering zone where relatively little oxygen is consumed. Obviously, the second end of the exhaust gas recirculation mechanism may be open to various points on the plurality of regions other than the above-mentioned points. In the following, reference will be made to the configuration of the exhaust gas circulation mechanism configured to circulate the exhaust gas drawn from the point where the ventilation resistance of the sintered raw material layer is greatest towards 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 is communicated with a gas ventilation pipe 421 which communicates with the bellows 411 provided in the gas circulation area. The other end of the circulation pipe 430 may communicate with the gas discharge cover 460 . The circulation 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 to allow exhaust gas to flow from one end of the circulation pipe 430 to the other end. Due to this flow, a circulating flow of exhaust gas can be generated in the wind box 411 provided in the gas circulating region.

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

Among the gas ventilation pipes 420, the gas ventilation pipes 422 not connected to the exhaust gas circulation mechanism may communicate with the exhaust gas discharge mechanism. The exhaust gas collected in the bellows 412 provided in the gas discharge area may be discharged to the atmosphere through the exhaust gas discharge mechanism.

The exhaust emission mechanism has a first end and a second end. The first end of the gas ventilation pipe 420 communicates with the second gas ventilation pipe group 422 which communicates with the bellows 412 . The second end may communicate with the atmospheric space. The exhaust gas discharge mechanism may discharge the exhaust gas collected in the bellows 412 disposed in the gas discharge area toward the atmospheric space. The exhaust exhaust mechanism may include an elongated exhaust chamber 440 , a pollutant collector 470 , a main blower 452 and an exhaust exhaust module 480 .

The elongated discharge chamber 440 may be hollow. One end of the elongated discharge chamber 440 may be connected to a gas ventilation duct 422 in communication with a bellows 412 arranged in the gas discharge area. The other end of the elongated discharge chamber 440 may be connected to the 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 . Via this flow, a flow of exhaust gas can be generated in the bellows 412 arranged in the gas discharge area. Exhaust gas may contain pollutants such as dust, nitrogen oxides and sulfur oxides. In order to filter these pollutants, a pollutant collector 470 is arranged upstream of the main blower 452 in the flow direction of the exhaust gas. The pollutant collector 470 may be installed at a predetermined position of the discharge chamber 440 .

Downstream of the sintering zone a crushing unit (not shown) may be arranged. The sintered ore discharged from the trolley 10 is crushed into a predetermined size by a crushing unit, and then, the crushed ore is screened at a screen (not shown). The screened sinter can be fed to other processes, such as blast furnace processing, and the screened sinter can be used as upper sinter based on the particle size of the screened sinter or can be reused as 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 terms of the location and number of bellows on which they must act. In addition, the ventilation level of the feedstock layer within the trolley 10 on and moving along the bellows 412 connected to the main blower 452 and within the trolleys 10 in the array on and moving along the bellows 411 connected to the circulating blower 451 The ventilation levels of the raw material layers are also different. 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 gas discharge area and the negative pressure applied by the circulation blower 451 to the bellows 411 provided in the gas circulation area are different from each other. The amount of exhaust gas sucked by the main blower 452 and the amount of exhaust gas sucked by the circulation blower 451 are also different. For example, the magnitude of the negative pressure applied by the circulation blower 451 to the bellows 411 provided in the gas circulation area may be larger than the magnitude of the negative pressure applied by the main blower 452 to the bellows 412 provided in the gas discharge area. Of course, the magnitude of the negative pressure applied by the main blower 452 to the bellows 412 provided in the gas discharge area may be larger than the magnitude of the negative pressure applied by the circulating blower 451 to the bellows 411 provided in the gas circulation area. That is, the magnitude of the negative pressure in the gas discharge area may be larger.

In this case, the exhaust gas in the low negative pressure area may flow back toward the high negative pressure area. That is, at the boundary between the gas circulation area with different negative pressures and the gas discharge area, interference between the exhaust gas flow may occur, resulting in the backflow of the exhaust gas to the area with high negative pressure. The backflowing exhaust gas can flow into the high negative pressure area through the gap between the bottom 11 of the trolley 10 and the gas suction array.

In this way, due to the difference in at least one of operating pressure and suction force between the main blower 452 and the recycle blower 451, part of the exhaust gas that must be discharged to the gas discharge area will be in the gas suction array. The boundary between the gas discharge area and the gas circulation area is backflowed into the gas circulation area with high negative pressure. As a result, the amount of exhaust gas suction by the main blower 452 is reduced. This phenomenon is referred to as flow disturbance between the main blower 452 and the circulation blower 451 .

According to an embodiment of the present disclosure, in order to suppress flow disturbance between the main blower 452 and the circulation blower 451 at the boundary between the gas discharge area and the gas circulation area of the gas suction array, a gas barrier may be formed at the boundary Structure 413 to seal the gap between the cart 10 and the gas suction array.

Referring to FIG. 2 , the gas blocking structure 413 extends in a direction intersecting the travel direction of the cart 10 . The gas barrier structure 413 may be formed in, for example, a block shape. In the case where adjacent wind boxes define a boundary between the exhaust gas circulation area and the exhaust gas discharge area, the gas blocking structure 413 may be provided on adjacent upper ends of some of the plurality of wind boxes adjacent to the boundary.

In this regard, the gap between the top of the gas barrier structure 413 and the bottom of the cart 10 may be greater than 0 but less than or equal to 100 mm within a tolerance range. Here, the tolerance range may refer to the tolerance due to mechanical or electronic errors of the measuring device. Alternatively, the tolerance range may refer to the minimum gap that can prevent a structural collision between the cart 10 and the gas barrier structure 413 due to structural deformation of the bottom portion 11 of the cart 10 and the gas barrier structure 413 .

The gas blocking structure 413 can narrow the gap between the bottom 11 of the trolley 10 and the upper end of the bellows at the boundary between the gas discharge area and the gas circulation area. That is, the gas blocking structure 413 can substantially achieve the gas blocking effect through the gap. Therefore, the backflow of gas from the low negative pressure region to the high negative pressure region can be suppressed. At other locations where there is no gas blocking structure 413, the exhaust gas can flow freely through the gap between the bottom 11 of the cart 10 and the top of the bellows. Therefore, in each of the gas discharge area and the gas circulation area, the suction of the exhaust gas can be stably achieved.

The gas barrier structure 413 according to embodiments of the present disclosure may include various modifications as described below.

Referring to FIG. 3 , the gas barrier structure 413A according to the first modified embodiment of the present disclosure may include a gas barrier 413 ′ extending in a direction intersecting the traveling direction of the cart 10 , and a gas barrier 413 ′ extending from the gas barrier 413 ′ on the cart 10 A baffle 414 in the form of a wing or plate extending in the direction of travel. In this regard, the baffle 414 may extend horizontally from the upper end of the gas barrier 413'.

The baffle 414 defines an airflow blocking surface above the bellows where the baffle 414 is positioned, so that backflow of exhaust gases from a low negative pressure area, such as a gas discharge area, to a high negative pressure area, such as a gas circulation area, can be directly prevented. That is, the baffles 414 are of great importance in terms of fluid dynamics. This will be described below in conjunction with numerical analysis of exhaust gas flow within gas suction arrays according to embodiments of the present disclosure and gas suction arrays according to comparative examples.

Additionally, baffles 414 may be used to receive and support material falling through openings defined in the bottom 11 of the cart 10, thereby further narrowing the gap between the cart 10 and the gas suction array. In this way, a more effective airflow barrier can be achieved at the boundary between the gas discharge area and the gas circulation area.

5 , the gas barrier structure 413C according to the third modified embodiment of the present disclosure may be different in the height of the baffle plate 414 from the gas barrier structure 413A of the first modification as described above. That is, the gas barrier structure 413C according to the third modified embodiment of the present disclosure may include a gas barrier body 413 ′ extending in a direction intersecting the traveling direction of the cart 10 , and a gas barrier body 413 ′ extending from a lower portion of the gas barrier body 413 ′. Baffles 414 in the form of wings or plates extending in the direction of travel of the cart 10 .

In this manner, in various variations of the present disclosure, baffle 414 may extend from a top or bottom portion of gas barrier 413', or may extend from an intermediate portion between the top and bottom portions of gas barrier 413' Partially extended. That is, the baffle 414 may extend from various heights of the gas barrier 413'.

3 and 5, the baffle 414 may be located in a bellows in at least one of a gas circulation area and a gas discharge area. In this regard, the baffles may be located in the bellows of the low negative pressure areas in the gas circulation area and the gas discharge area. Further, in the gas barrier structure 413D of the fourth modification as described later and the gas barrier structure 413E of the fifth modification as described later, the baffle plate 414 may be located in the gas circulation region and the gas discharge region with low In the bellows of the negative pressure area. In this regard, the first modification, the third modification, the fourth modification and the fifth modification of the present disclosure show the baffle 414 located in the bellows which is the gas discharge region of the low negative pressure region.

On the contrary, referring to FIG. 4 , the gas blocking structure 413B according to the second modified embodiment of the present disclosure may include a pair of baffles 414 in the bellows of the gas circulation area and the bellows of the gas discharge area, respectively. In other words, the gas blocking structure 413B according to the second modified embodiment of the present disclosure may include a gas blocking body 413 ′ extending in a direction intersecting the traveling direction of the cart 10 , in the form of a wing or a plate, and in the form of a wing or plate, and extending in the direction of the cart 10 . A pair of baffles 414 protruding from the gas blocking body 413' in the traveling direction of the gas and respectively arranged in the gas circulation area and the gas discharge area.

Obviously, in addition to the modifications described above, embodiments of the present disclosure may include various modifications, including baffles 414 located only in the bellows of the high negative pressure areas in the gas circulation area and the gas discharge area. That is, the baffles 414 according to modifications of the present disclosure may be located in the bellows of at least one of the gas circulation area and the gas discharge area.

According to a modification of the present disclosure, when the width of the top of the bellows facing the baffle 414 is set to 1, the extension length of the baffle may be greater than 0 and less than or equal to 2/3. If the extension length of the baffle 414 exceeds 2/3 of the width 1 of the bellows facing the top of the baffle 414, the effect of preventing the backflow of exhaust gas becomes greater, but the flow of exhaust gas into the bellows facing the baffle becomes worse. To this end, the extension length of the baffle 414 is equal to or less than 2/3 with respect to the width 1 of the bellows facing the top of the baffle 414 .

6 , the gas barrier structure 413D according to the fourth modified embodiment of the present disclosure may further include at least one rib 415 protruding upward from the top surface of the baffle plate 414 . That is, the gas blocking structure 413D according to the fourth modified embodiment of the present disclosure may include a gas blocking body 413 ′ extending in a direction intersecting the traveling direction of the cart 10 , blocking the gas blocking body 413 ′ in the traveling direction of the cart 10 . A baffle 414 extending from the body 413 ′ and at least one rib 415 protruding upward from the top surface of the baffle 414 .

In this regard, in Figure 6, a baffle 414 is shown, which is arranged only in the bellows of the gas discharge area and extends from the lower part of the gas barrier 413'. The present disclosure is not limited thereto. The baffle 414 according to the fourth modification of the present disclosure may be located only in the bellows of the gas circulation area, or may be located in each of the bellows of the gas discharge area and the bellows of the gas circulation area. Additionally, the baffles 414 as described above may extend from portions having different heights, including the upper and lower portions of the gas barrier 413'.

The ribs 415 may be multiple and may extend in the direction of travel of the cart or in a direction that intersects both the vertical direction and the direction of travel of the cart. In this regard, some of the plurality of ribs 415 extend in the direction of travel of the trolley, while the remaining ribs of the plurality of ribs 415 extend in a direction that intersects both the vertical direction and the direction of travel of the trolley, whereby it is possible to Implement grid structure. By using this grid structure, the raw material falling on the top surface of the baffle 414 can be contained in the grid structure, thereby suppressing or preventing backflow of exhaust gas.

In addition, the above-described ribs 415 apply flow resistance to the exhaust gas flowing on the top surface of the baffle 414, and can suppress the flow of the exhaust gas from the low negative pressure region to the high negative pressure region.

7 , the gas blocking structure 413E according to the fifth modification of the present disclosure may further include a tip portion 416 protruding downward in an oblique manner from the distal end of the baffle 414 . That is, the gas blocking structure 413E may include a gas blocking body 413 ′ extending in a direction intersecting the traveling direction of the cart 10 , a baffle 414 extending from the gas blocking body 413 ′ in the traveling direction of the cart 10 , and being formed to A tip 416 protruding downward in an oblique manner from the distal end of the baffle 414 in the direction from the body 413 ′ to the end of the baffle 414 .

Due to the tip 416, a larger airflow blocking area in the bellows facing the baffle 414 can be reliably ensured, while collisions between the gas blocking structure and the bottom 11 of the trolley can be prevented. For example, when the sectional area of the bellows facing the upper end of the baffle 414 is set to 1, the total extension length of the baffle 414 and the tip 416 in the traveling direction of the trolley may be greater than 0 and less than or equal to 2/3.

Features of gas barrier structures according to the above modifications may be substituted for each other or combined with each other to form various configurations of gas barrier structures.

The exhaust gas treatment device for a raw material treatment facility according to another embodiment (the second embodiment) of the present disclosure may be modified as follows: the exhaust gas treatment device may include a plurality of bellows arranged in the moving direction of the trolley and provided below the trolley, wherein the cart is configured to move along a plurality of regions while receiving the feedstock in the cart, wherein the plurality of bellows has an exhaust gas circulation region and an exhaust gas discharge region spaced apart from each other, wherein some of the plurality of bellows The upper ends of the bellows protrude more upward than the upper ends of the remaining bellows of the plurality of bellows, wherein some of the bellows are adjacent to the boundary between the exhaust gas circulation area and the exhaust gas discharge area.

In one embodiment, some of the plurality of bellows include first and second bellows, and the first and second bellows define a boundary between the first and second bellows, and the first and second bellows The second bellows are respectively disposed in the exhaust gas circulation area and the exhaust gas discharge area, wherein the interval between the upper end of the first bellows and the upper end of the second bellows relative to the bottom surface of the trolley may fall within the range of 0mm to 100mm within an error range, but 0mm is not included.

In this case, at the boundary between the gas discharge area and the gas circulation area, at the upper end of the first bellows and the upper end of the second bellows and between the upper ends of the first bellows and the second bellows A gas blocking structure in order to reduce the gap between the bottom of the trolley and the bellows, more specifically, the gap between the bottom of the trolley and the upper end of the first bellows and the upper ends of the second bellows. In this regard, the configuration of the gas barrier structure may be the same as or similar to the configuration of the gas barrier structure according to the above-described embodiments of the present disclosure. The remaining components of the exhaust gas treatment device in this embodiment may be similar or identical to those of the above-described embodiments of the present disclosure.

The gas barrier structure according to the second embodiment of the present disclosure 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 disclosure may be the same or similar to the configuration and operation of the above-described modified gas barrier structure according to the first embodiment of the present disclosure .

FIG. 8 is a schematic diagram illustrating exhaust gas flow of a gas suction array according to a comparative embodiment. In this regard, the gas suction array according to the comparative embodiment has no gas blocking structure, and therefore, the gap between the gas suction array and the trolley is, for example, larger than 100 mm as in the conventional method.

Referring to FIG. 8 , in the comparative embodiment, there is no gas blocking structure, so that the exhaust gas can flow back through the boundary between the gas discharge area and the gas circulation area. In addition, the exhaust gas passing through the raw material layer can be concentrated in the 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 in communication with the gas discharge area is reduced, and therefore, the treatment efficiency may be reduced.

For example, for a conventional sintering machine, there is sufficient clearance between the bellows and the trolley to allow exhaust gas to flow through the clearance as shown in FIG. 8 . When the sintering exhaust gas circulation method is applied to a sintering machine having such a configuration and the firing area of the sintering machine is increased, exhaust gas control cannot be reliably achieved by a single blower, and therefore, an additional blower must be installed. When multiple blowers are operating, exhaust gas may flow backward through the gap, and exhaust gas control efficiency may be reduced. In a sintering machine that operates multiple blowers, there should be no exhaust gas transfer between the bellows connected to the different blowers, so that exhaust gas control is effective.

In the embodiments and modifications of the embodiments of the present disclosure, a sintering machine using two or more blowers may use a gas barrier structure to effectively control the exhaust gas. In order to illustrate the effect of the gas barrier structure according to the embodiment of the present disclosure, numerical analysis will be performed on the exhaust gas flow of the gas pumping array of the comparative example and the embodiment of the present disclosure and the results of the numerical analysis will be described.

9 is a graph showing a numerical analysis of exhaust gas flow in a gas pumping array in accordance with embodiments of the present disclosure and comparative examples. (a) of FIG. 9 shows a numerical analysis result of the exhaust gas flow at the boundary between the gas discharge region and the gas circulation region within the gas suction array according to the comparative embodiment. (b) of FIG. 9 shows a numerical analysis result of the exhaust gas flow at the boundary between the gas discharge region and the gas circulation region within the gas suction array according to one embodiment of the present disclosure. (c) of FIG. 9 shows the gas pumping array between the gas discharge region and the gas circulation region when the gas barrier structure including the gas barrier and one baffle plate is used according to the first modification of the present disclosure. Results of numerical analysis of exhaust gas flow at the boundary.

That is, (a) to (c) of FIG. 9 show the results of the flow analysis of the exhaust gas flow based on whether the gas barrier is arranged and whether the baffle is arranged. In this regard, the pressure difference between the main blower and the circulation blower was set to 200 mmAq, and the circulation blower had a relatively high negative pressure. In the comparison between (a) and (b) of FIG. 9 , for the comparative example, it can be confirmed that the exhaust gas from the gas discharge region is forcibly recirculated into the gas circulation region, while for the embodiment of the present disclosure, it can be seen that This exhaust gas backflow is significantly reduced.

In this regard, the backflow of exhaust gas to the gas circulation area is significantly reduced, but a portion of the exhaust gas on the gas barrier structure is still biased towards the gas circulation area. In this regard, this exhaust flow bias can start from inside the cart. This is because the feedstock layer in the trolley has voids through which the exhaust gas in the feedstock layer can easily be biased towards the gas circulation area.

At the same time, the gas blocking structure must be spaced a certain distance from the bottom of the trolley because the trolley keeps moving. From inside the feedstock layer, the biased exhaust gas can flow into the gas circulation region along the top surface of the gas barrier structure. In a variation of the present disclosure, the gas barrier structure has baffles in order to prevent or prevent biasing. The baffle extends in the direction of travel of the trolley. Using this baffle structure, the exhaust gas flow along and on the gas barrier structure is not biased, but is divided substantially equally into the gas discharge area and the gas circulation area.

In the comparison between (b) and (c) of FIG. 9 , it can be seen that the gas barrier structure with the gas barrier and the baffle plate suppresses the backflow of exhaust gas more effectively than the gas barrier structure with only the gas barrier. That is, the modified gas blocking structure according to the present disclosure may further include a baffle plate to more effectively suppress the backflow of exhaust gas. In this manner, the inventors have confirmed that the embodiments of the present disclosure and their modifications effectively suppress the backflow of exhaust gas. On the other hand, in order to observe whether at least one of the gas barrier of the present embodiment of the present disclosure and the modified baffle of the present disclosure prevent the backflow of exhaust gas, the change in the amount of exhaust gas at the gas barrier and the baffle was measured. .

10 shows photographs of the results of a simplified simulation of exhaust gas flow inside a gas pumping array according to the comparative example and embodiments of the present disclosure and modifications thereof. (a) of FIG. 10 shows a photograph of the result of the simplified simulation experiment according to the comparative example. (b) of FIG. 10 shows a photograph of the result of a simplified simulation experiment according to an embodiment of the present disclosure. (c) of FIG. 10 shows a photograph of the results of a simplified simulation experiment for a gas barrier structure having a gas barrier and a single baffle according to the first modification of the present disclosure.

In this experiment, when the cross-sectional area of the upper end of the bellows was set to 1, the extension length of the baffle was set to 2/3. For simplified simulation experiments, geometrically reduced models were prepared to simulate the internal structure of each gas pumping array corresponding to each of the comparative examples, embodiments of the present disclosure, and modifications thereof. Each experiment was performed for each simplified model using the sintering conditions of the sintering machine.

The results of the simplified simulation experiments are shown in FIG. 11 . 11 shows a table representing the results of a simplified simulation experiment for exhaust gas flow in a gas pumping array according to comparative examples, embodiments of the present disclosure, and modifications thereof. In this regard, in FIG. 11 , the comparative example corresponds to the results of a simplified simulation experiment according to the comparative example of the present disclosure, the embodiment 1 corresponds to the results of the simplified simulation experiment of the embodiment according to the present disclosure, and the embodiment 2 Results corresponding to simplified simulation experiments for a barrier structure comprising a gas barrier and a single baffle according to the first variant of the present disclosure.

Referring to these results, it can be seen that for Embodiment 1 with the gas barrier, the exhaust gas flow rate is reliably maintained as compared to the comparative example. It can be seen that for Embodiment 2, which also includes baffles, the exhaust gas flow to the gas circulation area is increased by 12% and the overall flow is increased by 11% compared to the comparative example. 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 disturbance. The gas blocking structure, which also includes baffles, can simultaneously suppress flow disturbance and increase the flow of exhaust gas.

The arrangement of the baffles allows both the total exhaust flow and the exhaust flow to the gas circulation area to be increased for the following reasons. Since the flow disturbance between the gas discharge area and the gas circulation area is effectively suppressed or prevented by the baffle, the exhaust gas can be sufficiently drawn from the raw material layer in the gas circulation area with relatively high ventilation resistance.

Specifically, the negative pressure in the gas circulation area is not disturbed by the negative pressure in the gas discharge area. Therefore, the negative pressure in the gas circulation area acts on all or most of the feedstock layers in the gas circulation area with higher ventilation resistance. This allows the exhaust gas flow in the gas circulation area to be increased, while allowing the exhaust gas to be smoothly drawn in the gas discharge area. This can increase the total exhaust flow.

Hereinafter, a method of treating exhaust gas using the exhaust gas treatment device according to an embodiment of the present disclosure is described. The exhaust gas treatment method may include: loading feedstock into a cart and thermally treating the feedstock in the cart while moving the cart along a plurality of zones; suctioning the interior of the cart downward using a gas suction array; and inhibiting gas from the exhaust gas The low negative pressure area in the circulation area and the exhaust gas discharge area flows into the space between the gas suction array and the trolley.

In this regard, suppressing the inflow of the exhaust gas from the low negative pressure region into the space may include using a gas barrier structure provided at a boundary between the exhaust gas circulation region and the exhaust gas discharge region.

First, the raw material is supplied to the raw material hopper. In this regard, the raw material is prepared by mixing and humidifying fine iron ore, limestone, fine coke and anthracite and pelletizing them to a few millimeters. Load the prepared raw material into the raw material hopper. In this regard, sintered ore having a predetermined particle size is selected as the upper sintered ore, and the selected upper sintered ore is loaded in the upper sintered ore hopper.

Then, the raw materials are loaded on the trolley. The feedstock is heat treated while the cart is moved along the plurality of zones.

Specifically, the heat treatment process includes: driving the trolley in the arrangement direction of the plurality of regions; loading the raw material into the trolley using a raw material hopper; igniting the raw material with an ignition furnace to form a swirling area in the raw material inside the trolley, and making the swirling The raw material is sintered while the zone moves from the upper end to the lower part in the inner space of the trolley.

More specifically, when the raw material and the upper sintered ore are respectively fed to the corresponding hoppers, the trolley travels in the arrangement direction of the plurality of regions along the conveying path. Then, in the loading area of the plurality of areas, the upper sintered ore is placed on the bottom of the trolley, and then the raw material is placed on the top surface of the upper sintered ore, thereby forming a raw material layer.

When the raw material layers are formed, the raw material layers are sequentially moved along the firing area and the sintering area. In the ignition region, the feedstock layer is ignited to form a convoluted zone in the feedstock layer. Then, in the sintering region, the raw material layer is heat-treated at a high temperature of about 1300° C. to 1400° C. while moving the convoluted zone from the upper material layer to the lower material layer in the raw material layer, thereby forming a sintered ore.

At the same time as the heat treatment process described above, a gas suction array is used to suck the gas inside the cart and circulate some of the exhaust gas through the cart and exhaust the rest. A gas suction array is provided below the bottom of the trolley and extends in the direction of the trolley. The gas suction array is divided into a gas circulation area and a gas discharge area. The gas pumping array may be a gas pumping array as described above in an exhaust gas treatment device according to embodiments of the present disclosure. Via this gas suction, the swirling zone can be moved from the upper end to the lower part in the raw material layer, so that the raw material is completely sintered.

The backflow suppression operation may occur in conjunction with the suction of the interior of the cart. The backflow suppression operation may include suppressing the flow of gas from the lower negative pressure region of the exhaust gas recirculation region and the exhaust gas discharge region through the gap between the gas suction array and the trolley to the higher negative pressure region of the exhaust gas recirculation region and the exhaust gas discharge region . In this regard, inhibiting the flow of gas from the lower negative pressure region to the higher negative pressure region may include using the above-defined gas barrier structure disposed at the boundary between the exhaust gas circulation region and the exhaust gas discharge region.

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

On the other hand, the use of the gas barrier structure according to this embodiment, and the use of the modified baffles and ribs according to this embodiment, have been described many times above for suppressing or preventing backflow of exhaust gas. Therefore, in order to avoid repetitive description, the description thereof will be omitted.

The finished sinter is discharged to the crushing unit at the end of the conveying path. The discharged sinter is crushed to a predetermined particle size by a crushing unit. The crushed ore is screened by a screener. Depending on the particle size, the screened ore can be fed to a blast furnace for subsequent processing, or alternatively can be used as topside sinter, or alternatively can be considered returned ore for reuse as raw material.

According to embodiments of the present disclosure, a gas barrier structure disposed at the boundary between the exhaust gas circulation area and the exhaust gas discharge area may be used to reduce the separation at the boundary between the gas suction array and the trolley. Therefore, during the production of sinter and the circulation of the exhaust gas, the backward flow of the gas at the boundary between the discharge area and the circulation area due to the negative pressure difference between the discharge area and the circulation area can be suppressed or prevented. Therefore, the flow rate of the exhaust gas can be stably secured during operation.

According to a modification of the present disclosure, the gas blocking structure has baffles, or a combination of baffles and ribs, so that both the total flow rate of exhaust gas and the flow rate of exhaust gas to be circulated can be increased, so that the operation efficiency can be further improved, and it is possible to obtain High quality sinter.

The above-described embodiments of the present disclosure are only for illustrating the present disclosure, not for limiting the present disclosure. Features presented in the above-described embodiments of the present disclosure may be combined or replaced with each other to form various modifications. It should be noted that these modifications may be considered to fall within the scope of the present disclosure. The present disclosure will be embodied in various forms within the scope of the claims and their equivalents. Those skilled in the art will understand that various embodiments are possible within the scope or spirit of the present disclosure.

Claims (13)

1. An exhaust gas treatment device comprising:

a gas suction array extending in a traveling direction of a cart and disposed below the cart, the cart being disposed to move along a plurality of zones while processing a raw material, wherein the gas suction array has an exhaust gas circulation zone and an exhaust gas discharge zone separated from each other; and

a gas barrier structure disposed at a boundary between the exhaust gas circulation region and the exhaust gas discharge region to seal a space between the gas pumping array and the cart at the boundary,

wherein the gas barrier structure comprises: a gas barrier extending in a direction intersecting the direction of travel of the cart; a baffle extending from the gas block in the direction of travel of the cart; and a plurality of ribs formed to protrude upward from the top surface of the baffle plate,

wherein some of the plurality of ribs extend in the direction of travel of the cart and the remaining ribs extend in a direction that intersects the direction of travel of the cart, the plurality of ribs comprising a grid structure.

2. The exhaust treatment device of claim 1, wherein the gas pumping array includes a plurality of bellows arranged along the direction of travel of the cart,

wherein the plurality of bellows respectively have upper ends arranged side by side in an extension direction of the gas pumping array, wherein the upper ends are coupled to each other,

the gas blocking structure is provided on adjacent upper ends of some of the plurality of windboxes adjacent to the boundary with adjacent windboxes defining the boundary between the exhaust gas circulation region and the exhaust gas discharge region therebetween.

3. The exhaust treatment device of claim 1, wherein a spacing between the top surface of the gas blocking structure and the bottom surface of the cart at the boundary is greater than 0 and less than or equal to 100mm within a tolerance range.

4. An exhaust gas treatment device comprising:

a plurality of windboxes arranged in a traveling direction of the cart and disposed under the cart, wherein the cart is disposed to move along a plurality of zones while processing the raw material, wherein the plurality of windboxes have an exhaust gas circulation zone and an exhaust gas discharge zone separated from each other, and

a gas blocking structure provided at a boundary between the exhaust gas circulation region and the exhaust gas discharge region to seal a gap at the boundary between the cart and some of the plurality of windboxes,

wherein upper ends of some of the plurality of windboxes protrude upward more than upper ends of the remaining of the plurality of windboxes, wherein some of the plurality of windboxes are adjacent to the boundary,

wherein the gas barrier structure comprises: a gas barrier extending in a direction intersecting the direction of travel of the cart; a baffle extending from the gas block in the direction of travel of the cart; and a plurality of ribs formed to protrude upward from the top surface of the baffle plate,

wherein some of the plurality of ribs extend in the direction of travel of the cart and the remaining ribs extend in a direction that intersects the direction of travel of the cart, the plurality of ribs comprising a grid structure.

5. The exhaust treatment device of claim 4, wherein some of the plurality of windboxes include a first windbox and a second windbox defining the boundary therebetween, the first and second windboxes being disposed in the exhaust circulation region and the exhaust discharge region, respectively,

the interval between the upper end of the first air box and the upper end of the second air box relative to the bottom surface of the trolley can be larger than 0 and smaller than or equal to 100 mm.

6. The exhaust treatment device of claim 5, wherein the gas barrier structure is disposed at and between the upper ends of the first and second windboxes to seal gaps between the cart and some of the windboxes at the boundary.

7. The exhaust treatment device of claim 1 or 4, wherein the baffle extends from at least one of an upper end and a lower portion of the gas barrier or a portion between the upper end and the lower portion of the gas barrier.

8. The exhaust treatment device of claim 1 or 4, wherein the baffle is disposed in at least one of the exhaust gas circulation region and the exhaust gas discharge region.

9. The exhaust gas treatment device according to claim 1 or 4, wherein the baffle plate is provided in a lower negative pressure region in the exhaust gas circulation region and the exhaust gas discharge region.

10. The exhaust gas treatment device according to claim 1 or 4, wherein when a sectional area of the windbox facing an upper end of the baffle is set to 1, an extension length of the baffle is greater than 0 and less than or equal to 2/3.

11. The exhaust treatment device of claim 1 or 4, wherein the gas blocking structure further comprises a tip that projects obliquely downward from a distal end of the baffle plate in a direction from the gas blocker of the gas blocking structure to an end of the baffle plate.

12. The exhaust gas treatment device according to claim 11, wherein when a sectional area of an upper end of a windbox facing the baffle is set to 1, a sum of extension lengths of the baffle and the tip in the traveling direction of the cart is greater than 0 and less than or equal to 2/3.

13. An exhaust gas treatment method comprising:

loading feedstock into a cart and heat treating the feedstock in the cart while moving the cart along a plurality of zones;

drawing down an interior of the cart using a gas suction array, wherein the gas suction array extends in a direction of travel of the cart and is disposed below the cart, wherein the gas suction array has an exhaust gas circulation region and an exhaust gas discharge region that are separated from each other; and

suppressing the inflow of exhaust gas from a lower negative pressure region of the exhaust gas circulation region and the exhaust gas discharge region into a space between the gas suction array and the cart,

wherein a flow of the exhaust gas on a top surface is suppressed by using a plurality of ribs protruding from a top surface of a gas barrier structure provided at a boundary between the exhaust gas circulation region and the exhaust gas discharge region, some of the plurality of ribs extend in a traveling direction of the cart, and the rest of the plurality of ribs extend in a direction intersecting the traveling direction of the cart, and the plurality of ribs include a mesh structure.

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