WO2018155368A1 - Sintering machine for sintered ore - Google Patents

Sintering machine for sintered ore Download PDF

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Publication number
WO2018155368A1
WO2018155368A1 PCT/JP2018/005682 JP2018005682W WO2018155368A1 WO 2018155368 A1 WO2018155368 A1 WO 2018155368A1 JP 2018005682 W JP2018005682 W JP 2018005682W WO 2018155368 A1 WO2018155368 A1 WO 2018155368A1
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Prior art keywords
exhaust gas
hood
gas circulation
duct
sintered ore
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PCT/JP2018/005682
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French (fr)
Japanese (ja)
Inventor
関口　毅
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スチールプランテック株式会社
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Application filed by スチールプランテック株式会社 filed Critical スチールプランテック株式会社
Priority to EP18757056.9A priority Critical patent/EP3587975A4/en
Priority to CN201880009941.8A priority patent/CN110249194A/en
Priority to JP2019501304A priority patent/JP6816250B2/en
Publication of WO2018155368A1 publication Critical patent/WO2018155368A1/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
    • F27B21/00—Open or uncovered sintering apparatus; Other heat-treatment apparatus of like construction
    • F27B21/06—Endless-strand sintering machines
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B1/00—Preliminary treatment of ores or scrap
    • C22B1/14—Agglomerating; Briquetting; Binding; Granulating
    • C22B1/16—Sintering; Agglomerating
    • C22B1/20—Sintering; Agglomerating in sintering machines with movable grates
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D99/00—Subject matter not provided for in other groups of this subclass
    • F27D99/0073—Seals

Definitions

  • the present invention relates to sintering of a sintered ore used for producing a sintered ore by continuously burning a sintered raw material laminated on a plurality of pallet trucks while the plurality of pallet trucks are traveling. Related to the machine.
  • sintering raw materials are stacked on a plurality of pallet trucks whose bottom surface of the loading part has a lattice structure, and the pallet trucks are running by igniting the sintered raw material layers with an ignition device. There are some which produce sintered ore by continuously burning in between.
  • a space is provided between the rails on the floor surface on which the pallet truck travels, and a number of wind boxes are arranged along the rails below this space. Oxygen necessary for burning the sintered raw material layer on the pallet truck is supplied by air sucked downward from above the pallet truck through the sintered raw material layer by keeping the inside of these wind boxes at a negative pressure.
  • Patent Document 1 JP 2011-105985
  • NOx nitrogen oxides
  • Exhaust gas is sent to a circulating gas hood installed above the pallet through an exhaust gas circulation duct branched from the exhaust duct, from which high-temperature circulating exhaust gas is supplied to the sintering material layer on the pallet.
  • the present invention has been made to solve such a problem, and a sintered ore sintering machine capable of effectively preventing air leakage and ensuring high safety and increasing the exhaust gas circulation rate. It is intended to provide.
  • a sintered ore sintering machine of the present invention includes a sintering bed including a plurality of pallet carts that run on rails laid on a floor surface, and the plurality of pallet carts on the pallet carts.
  • a sintered ore sintering machine used to produce a sintered ore by continuously burning the sintered raw material laminated on the plurality of pallet carts,
  • An exhaust duct provided with a main blower for sucking exhaust from below the sintered bed and discharging it to the outside;
  • An exhaust gas circulation hood that covers the top of the plurality of pallet trucks;
  • An exhaust gas circulation duct connecting between the exhaust duct and the exhaust gas circulation hood;
  • a floor surface seal portion that hermetically seals a gap between the exhaust gas circulation hood and the floor surface;
  • the inside of the exhaust gas circulation hood is configured to be maintained at a pressure equal to or lower than atmospheric pressure.
  • the exhaust gas circulation hood may include a fixed hood and a movable hood, and at least a part of the sinter ore can be opened and closed by moving the movable hood.
  • an inter-hood seal portion that seals a gap between the movable hood and the fixed hood may be further provided.
  • At least a part of the exhaust gas in the portion where the exhaust gas circulation hood is provided may be returned to the exhaust gas circulation hood through the exhaust gas circulation duct.
  • the sintered ore sintering machine further comprising a main dust collector provided in the exhaust duct,
  • the main dust collector is provided on the upstream side of the main blower in the flow direction of the exhaust gas,
  • the exhaust gas circulation duct may be connected to the exhaust duct at a portion between the main dust collector and the main blower.
  • an intake port for taking in outside air may be provided in the exhaust gas circulation duct.
  • the exhaust gas circulation duct further includes a branch duct that branches from a portion between the connection with the exhaust duct and the intake port, The branch duct may be communicated with a space covered with the exhaust gas circulation hood at a position lower than an upper end of the pallet carriage.
  • a gas seal chamber is provided in at least one of the longitudinal ends of the exhaust gas circulation hood, and the exhaust gas circulation duct is not connected to the gas seal chamber. It is good also as a structure.
  • a suction duct connected to a suction blower that sucks gas in the gas seal chamber may be connected to the gas seal chamber.
  • the gas seal chamber includes an outer shielding member that closes a gap between the exhaust gas circulation hood and the plurality of pallet trucks and the floor surface, and a longitudinal direction of the exhaust gas circulation hood
  • the inner shielding member may be formed inside the outer shielding member in order to close a gap between the exhaust gas circulation hood and the plurality of pallet trucks and the floor surface.
  • the sintered ore sintering machine of the present invention includes a sintering bed including a plurality of pallet trucks that run on rails laid on a floor surface, and a sintered raw material laminated on the plurality of pallet trucks.
  • a main blower used to produce sintered ore by continuously burning while a plurality of pallet trucks are running, and sucking exhaust from below the sintering bed and discharging it to the outside
  • An exhaust duct provided with an exhaust gas, an exhaust gas circulation hood that covers the top of the plurality of pallet trucks, an exhaust gas circulation duct that connects the exhaust duct and the exhaust gas circulation hood, and a gap between the exhaust gas circulation hood and the floor surface
  • a floor seal portion that hermetically seals the exhaust gas circulation hood, and is configured to keep the inside of the exhaust gas circulation hood at a pressure equal to or lower than atmospheric pressure.
  • the floor seal portion is provided not between the movable side (pallet carriage) and the exhaust gas circulation hood (fixed side) as in the prior art, but between the floor surface that is the fixed side and the exhaust gas circulation hood. Therefore, the sealing performance can be sufficiently improved. Moreover, since the inside of the exhaust gas circulation hood is configured to be maintained at a pressure equal to or lower than the atmospheric pressure, leakage of the exhaust gas to the outside can be effectively suppressed.
  • FIG. 1 It is the schematic of the sintering machine of the sintered ore which concerns on Embodiment 1 of this invention. It is a perspective view of the exhaust gas circulation hood of the sintering machine of the sintered ore shown in FIG. (A) shows the state where the movable hood is closed, and (b) shows the state where the movable hood is opened. It is a cross-sectional view of a pallet truck, a wind box installed below it, and an exhaust gas circulation hood installed above. It is an enlarged view of the E section of FIG. It is a schematic side view which shows the open-close-type exhaust gas circulation hood with which the sintered ore sintering machine which concerns on Embodiment 1 of this invention is provided.
  • (A) shows the state where the movable hood is closed, and (b) shows the state where the movable hood is opened. It is a schematic side view which shows the modification of an open / close type exhaust gas circulation hood. It is the schematic of the exhaust gas circulation hood with which the sintering machine of the sintered ore which concerns on Embodiment 2 of this invention is provided.
  • a sintered ore sintering machine 50 according to an embodiment of the present invention will be described with reference to the drawings.
  • a sintered ore sintering machine 50 includes a sintering bed 6 including a plurality of pallet trucks 6 a that run on rails 7 laid on a floor surface 5.
  • the sintered raw material laminated on the plurality of pallet trucks 6a is used for continuously burning while the plurality of pallet trucks 6a are traveling to produce sintered ore, 6, an exhaust duct 2 provided with a main blower 14 for sucking exhaust gas from the bottom and exhausting it to the outside, an exhaust gas circulation hood 1 covering the upper side of the plurality of pallet trucks 6 a, an exhaust duct 2, and an exhaust gas circulation hood 1
  • the exhaust gas circulation duct 3 is connected to each other, and a seal member 4 that hermetically seals the gap between the exhaust gas circulation hood 1 and the floor surface 5, and the interior of the exhaust gas circulation hood 1 is set to a pressure below atmospheric pressure. Configured to keep.
  • the inside of the exhaust gas circulation hood 1 is maintained at a pressure equal to or lower than the atmospheric pressure, the leakage of the exhaust gas to the outside can be effectively suppressed, but in order to more effectively suppress the leakage of the exhaust gas. It is preferable to keep the inside of the exhaust gas circulation hood 1 at a negative pressure.
  • the exhaust gas circulation hood 1 is provided on the downstream side of the feeding device 17 and the ignition device 18 in the moving direction of the sintering bed 6, and includes a plurality of fixed hoods 1a and a plurality of movable hoods 1b. At least a part is configured to be openable and closable by moving. Therefore, the seal member 4 includes a floor seal plate 4a that seals a gap between the movable hood 1b and the floor surface 5, and an inter-hood seal plate 4b that seals a gap between the movable hood 1b and the fixed hood 1a. including.
  • the entire floor surface seal plate 4a extends below the lower end of the movable hood 1b, and the lower end surface is slidably in contact with the floor surface 5.
  • the entire inner surface of the inter-hood seal plate 4b is slidably in contact with the fixed hood.
  • the fixed hood 1a and the movable hood 1b are each provided with a fixed hood rib 35 and a movable hood rib 37 to maintain strength.
  • a fixed hood foundation member 36 is provided at the lower end of the fixed hood, and this portion is fixed to the floor surface 5 in an airtight and firm manner. Further, at both ends in the longitudinal direction of the exhaust gas circulation hood 1, gaps between the exhaust gas circulation hood 1 and the plurality of pallet trucks 6 a and the floor surface 5 are closed by the end shielding members 25.
  • the floor seal plate 4a is provided along the lower edge of the movable hood 1b and is fixed to the movable hood 1b.
  • the inter-hood seal plate 4b is one end of the movable hood 1b in the longitudinal direction of the exhaust gas circulation hood 1 and overlaps the fixed hood 1a when the movable hood 1b is closed. It is provided along and is fixed to the movable hood 1b.
  • the floor seal portion of the present invention is a lower end portion of the fixed hood 1a, that is, a portion that seals between the fixed hood 1a and the floor surface 5, and a floor provided on the movable hood 1b. And a face seal plate 4a.
  • the lower end portion of the fixed hood 1a functions as the floor seal portion of the present invention.
  • the inter-hood seal plate 4b functions as an inter-hood seal portion.
  • a plurality of wind boxes 22 are arranged side by side along the longitudinal direction of the exhaust gas circulation hood 1 below the sintering bed 6, and the exhaust duct 2 is connected to these wind boxes 22. ing.
  • a main dust collector 20 is provided in the exhaust duct 2, and a part of the exhaust gas is sent to an exhaust gas treatment device (not shown) by a main blower 14 provided in the subsequent stage.
  • the exhaust gas circulation duct 3 is connected to the exhaust duct 2 at a portion between the main dust collector 20 and the main blower 14.
  • a circulation blower 15 is provided in the exhaust gas circulation duct 3, and a part of the exhaust gas flowing through the exhaust duct 2 is sucked by this and returned to the exhaust gas circulation hood 1 through the exhaust gas circulation duct 3.
  • circulating exhaust gas is sent from the rear stage of the main dust collector 20 into the exhaust gas circulation hood 1 to keep the environment in the exhaust gas circulation hood 1 clean and reduce the load on the pallet truck 6a traveling in the hood. The effect which improves is acquired.
  • an electric dust collector and a bag filter can be used as the main dust collector 20.
  • the exhaust gas circulation duct 3 is provided with an intake port 11 for taking in outside air, and the outside air can be mixed with the circulating exhaust gas by the intake blower 16.
  • the oxygen concentration of the combustion gas (mixed gas of air and circulating exhaust gas) used for sintering can be adjusted by passing the sintering raw material layer.
  • the temperature of the circulating exhaust gas sent into the exhaust gas circulation hood 1 it is possible to prevent the exhaust gas circulation hood 1 from being heated at a high temperature, and to suppress damage to internal components such as a pallet truck due to the high temperature.
  • all the exhaust discharged from the wind box at the position corresponding to the part where the exhaust gas circulation hood is provided is exhausted outside the system, and from the wind box at the position corresponding to the part where the exhaust gas circulation hood is not provided.
  • all of the exhaust gas in the portion where the exhaust gas circulation hood 1 is provided is sucked by the exhaust duct 2.
  • a part of the exhaust gas is returned to the exhaust gas circulation hood 1 through the exhaust gas circulation duct 3 connected to the exhaust duct 2.
  • the exhaust gas circulation hood 1 can be installed on substantially the entire surface in the longitudinal direction of the sintering bed 6.
  • the exhaust gas circulation duct 3 further includes a branch duct 3 a that branches from a portion between the connection portion with the exhaust duct 2 and the intake port 11, and the branch duct 3 a is near the carriage wheel 8. From the floor surface to the space covered by the exhaust gas circulation hood 1 at the position of.
  • the space covered with the exhaust gas circulation hood 1 means a space inside the exhaust gas circulation hood 1 and mainly defined by the exhaust gas circulation hood 1, the floor surface, and the pallet truck 6a. . Since the branch duct 3a is branched from the exhaust gas circulation duct 3 upstream of the intake port 11 in the flow direction of the circulating exhaust gas in the exhaust gas circulation duct 3, no outside air is mixed into the circulating exhaust gas flowing through the branch duct 3a. Between the pallet truck 6a which is a moving body and the wind box 22 which is a fixed body, airtightness is achieved by the carriage side sliding member 6b and the wind box side rail member 22b which are seal members that slide in contact with each other.
  • the gas around the pallet truck 6a flows into the wind box 22 without passing through the sintering material layer loaded on the pallet truck 6a.
  • the outside air is mixed.
  • a circulating exhaust gas containing oxygen necessary for burning the sintering raw material is supplied to the upper side of the pallet truck 6a, and the ratio of the circulating exhaust gas not mixed with outside air is increased with respect to the air leakage from the lower side of the pallet truck 6a. be able to.
  • circulating exhaust gas containing the amount of oxygen necessary to burn the sintering raw material can be supplied to the sintering raw material layer from above the pallet truck, and discharged outside the system by increasing the exhaust gas circulation amount as much as possible. The amount of exhaust gas can be suppressed.
  • FIG. 5A shows a state where the movable hood 1b is closed.
  • two movable hoods 1b are provided for each open location, and the two movable hoods 1b are abutted between them to close the open locations.
  • the gap between the movable hood 1b and the floor 5 is sealed by the floor seal plate 4a, and the gap between the movable hood 1b and the fixed hood 1a is sealed by the inter-hood seal plate 4b.
  • the airtightness inside the exhaust gas circulation hood 1 is maintained.
  • FIG. 5B shows a state where the movable hood 1b is opened.
  • the movable hood 1b can be moved along the fixed hood 1a by the movable hood wheel 10 provided at the lower end, and the two movable hoods 1b are moved in opposite directions to greatly open.
  • the length Lo is ensured. Thereby, maintenance work such as pallet replacement can be performed easily and efficiently.
  • Such an open / close type exhaust gas circulation hood is made possible by the configuration of the present invention which does not require sealing with a moving body such as a pallet truck over the entire length.
  • FIG. 6 shows a modification of the openable exhaust gas circulation hood 1 of the first embodiment.
  • one movable hood 1b is provided for each open portion, and each movable hood 1b is lifted upward by a suspension wire 100 or the like. .
  • This modification has an advantage that the opening length Lo can be approximately doubled although there is a face that makes it difficult to open and close the movable hood 1b as compared with the configuration of the first embodiment.
  • gas seal chambers 30 are provided at both ends in the longitudinal direction of the exhaust gas circulation hood 1.
  • the gas seal chamber 30 has suction ducts 34 connected to a suction blower 33 that sucks the internal gas. It is connected.
  • the gas seal chamber 30 is provided inside the outer shielding member 31 in the longitudinal direction of the exhaust gas circulation hood, and the outer shielding member 31 that closes the gap between the exhaust gas circulation hood 1 and the plurality of pallet trucks 6a and the floor surface 5.
  • the exhaust gas circulation hood 1 is formed by an inner shielding member 32 that closes gaps between the pallet truck 6 a and the floor surface 5.
  • the arrows A to D in FIG. 7 are for explaining the flow rate balance due to air leakage and suction. It is very difficult to seal the gap at both ends in the longitudinal direction of the exhaust gas circulation hood 1, but as shown in FIG. 7, the exhaust gas circulation duct 3 is not connected to the gas seal chamber 30, and the exhaust gas is not As a result, the seal against the circulating exhaust gas at both ends in the longitudinal direction of the exhaust gas circulation hood 1 is doubled, and in addition, the air leakage A from the outer shielding member 31 side in the gas seal chamber 30 The air leakage B from the inner shielding member 32 side does not leak to the outside by the suction C on the suction duct 34 side connected to the environmental dust collector 21 and the suction D on the wind box 22 side.
  • the air leakage A the air leakage B.
  • the pressure inside the inner shielding member 32 of the exhaust gas circulation hood 1 is atmospheric pressure
  • the air leakage A the air leakage B.
  • the pressure inside the inner shielding member 32 of the exhaust gas circulation hood 1 is a negative pressure
  • the gas seal chamber 30 is connected to a suction duct 34 connected to the environmental dust collector 21 to suck the internal gas, thereby increasing the negative pressure of the gas seal chamber 30 and preventing the outside air leakage.
  • a suction duct 34 connected to the environmental dust collector 21 to suck the internal gas, thereby increasing the negative pressure of the gas seal chamber 30 and preventing the outside air leakage.
  • the air leakage prevention effect can also be obtained by providing the gas seal chamber 30 and sucking the internal gas only by the suction D.
  • the exhaust gas circulation duct 3 includes a branch duct 3 a that branches from a portion between the connection portion with the exhaust duct 2 and the intake port 11, and is located in the vicinity of the carriage wheel 8. This is communicated from the floor surface to the space covered by the exhaust gas circulation hood 1 at a position where a seal portion between the pallet carriage 6a and the wind box 22 (the carriage side sliding member 6b and the wind box side rail member) is connected. 22b), by returning the circulating exhaust gas that is not mixed with outside air, the ratio of the circulating exhaust gas that is not mixed with outside air in the air leakage from the bottom of the pallet truck 6a into the wind box may be increased. This is a preferable form.
  • the branch duct 3a only needs to communicate with the space covered with the exhaust gas circulation hood 1 at a position lower than the upper end of the pallet truck 6a.

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Abstract

The present invention provides a sintering machine that is for obtaining sintered ore and that is capable of increasing the circulation volume of exhaust gas and ensuring high safety by effectively preventing air leakage. This sintering machine 50 for obtaining sintered ore is provided with a sintering bed 6 comprising a plurality of pallet trolleys that run on a track laid out on a floor surface, and is used for manufacturing a sintered ore by continuously combusting a sintering raw material stacked on the pallet trolleys while the pallet trolleys are moving. The sintering machine 50 is also provided with: an exhaust duct 2 which has disposed therein a main blower 14 for drawing exhaust gas from below the sintering bed 6 and discharging the exhaust gas to outside; an exhaust gas circulation hood 1 that provides a cover above the pallet trolleys; an exhaust gas circulation duct 3 that connects the exhaust duct 2 and the exhaust gas circulation hood 1; and a seal part for hermetically sealing a gap between the exhaust gas circulation hood 1 and the floor surface, wherein the exhaust gas circulation hood 1 is configured so as to maintain the pressure therein at a level equal to or lower than the atmospheric pressure.

Description

焼結鉱の焼結機Sinter ore sintering machine
　本発明は、複数のパレット台車上に積層された焼結原料を複数のパレット台車が走行している間に連続的に燃焼させて焼結鉱を製造するために用いられる焼結鉱の焼結機に関する。 The present invention relates to sintering of a sintered ore used for producing a sintered ore by continuously burning a sintered raw material laminated on a plurality of pallet trucks while the plurality of pallet trucks are traveling. Related to the machine.
　焼結鉱の焼結機として、積載部の底面が格子構造を有する複数のパレット台車上に焼結原料を積層させ、この焼結原料層に点火装置で点火してパレット台車が走行している間に連続的に燃焼させることで焼結鉱を製造するものがある。 As a sintered ore sintering machine, sintering raw materials are stacked on a plurality of pallet trucks whose bottom surface of the loading part has a lattice structure, and the pallet trucks are running by igniting the sintered raw material layers with an ignition device. There are some which produce sintered ore by continuously burning in between.
　パレット台車が走行する床面上の軌条の間には空間が設けられ、この空間の下方に多数の風箱が軌条に沿って配置されている。パレット台車上の焼結原料層の燃焼に必要な酸素は、これらの風箱内を負圧に保つことによりパレット台車上方から焼結原料層を通して下方に吸引される空気によって供給される。 A space is provided between the rails on the floor surface on which the pallet truck travels, and a number of wind boxes are arranged along the rails below this space. Oxygen necessary for burning the sintered raw material layer on the pallet truck is supplied by air sucked downward from above the pallet truck through the sintered raw material layer by keeping the inside of these wind boxes at a negative pressure.
　従来、このような焼結機においては、特開２０１１-１０５９８５（特許文献１）に記載のように、焼結機の系外に排出する排ガス量や窒素酸化物（ＮＯｘ）総量の削減等を目的として、排ガス循環方式の操業方法が採用されている。 Conventionally, in such a sintering machine, as described in JP 2011-105985 (Patent Document 1), it is possible to reduce the amount of exhaust gas discharged from the system of the sintering machine or the total amount of nitrogen oxides (NOx). As an object, an exhaust gas circulation operation method is adopted.
　排ガスは、排気ダクトから分岐した排ガス循環ダクトを通してパレット上方に設置された循環ガスフードに送られ、ここからパレット上の焼結原料層に高温の循環排ガスが供給される。これにより、上記排ガス量の削減の他、排ガスの顕熱を焼結機において再利用することができるといった効果もある。 Exhaust gas is sent to a circulating gas hood installed above the pallet through an exhaust gas circulation duct branched from the exhaust duct, from which high-temperature circulating exhaust gas is supplied to the sintering material layer on the pallet. Thereby, in addition to the reduction of the exhaust gas amount, there is an effect that the sensible heat of the exhaust gas can be reused in the sintering machine.
特開２０１１-１０５９８５号公報JP 2011-105985 A
　一酸化炭素（ＣＯ）等を含む焼結機の排ガスが外部に漏れることを防止するため、固定体である循環ガスフードと移動体であるパレットとの間には複雑なシールが施されるが、経年劣化によってシール部が変形することもあり、長期間にわたってこのような固定体と移動体との間を十分シールし続けることは難しかった。 In order to prevent the exhaust gas of the sintering machine including carbon monoxide (CO) from leaking to the outside, a complicated seal is applied between the circulating gas hood that is a stationary body and the pallet that is a moving body. The seal portion may be deformed due to deterioration over time, and it has been difficult to sufficiently seal between the fixed body and the moving body over a long period of time.
　さらに、排ガス量の削減のためには排ガス循環量を増やすことが必要であるが、パレット下方から風箱内への外気の漏風が排ガス循環量の増加の妨げとなっていた。これは、パレット下方から風箱内への漏風により外気が排気と混合すると、本来排ガス処理の対象とする必要のない外気までも排気ダクトから排出される排ガスに含まれることとなり、実質的な排ガス循環量が減少してしまうことによる。 Furthermore, in order to reduce the amount of exhaust gas, it is necessary to increase the amount of exhaust gas circulation. However, the leakage of outside air from the bottom of the pallet into the wind box hinders the increase in the amount of exhaust gas circulation. This is because when outside air is mixed with exhaust gas due to air leakage from the bottom of the pallet into the wind box, even outside air that is not originally required for exhaust gas treatment is included in the exhaust gas discharged from the exhaust duct, This is because the amount of circulation decreases.
　本発明はかかる課題を解決するためになされたものであり、漏風を効果的に防止して高い安全性を確保するとともに排ガス循環量を増加することも可能となる焼結鉱の焼結機を提供することを目的とするものである。 The present invention has been made to solve such a problem, and a sintered ore sintering machine capable of effectively preventing air leakage and ensuring high safety and increasing the exhaust gas circulation rate. It is intended to provide.
　上記課題を解決するため、本発明の焼結鉱の焼結機は、床面上に敷設された軌条の上を走行する複数のパレット台車を含む焼結ベッドを備え、前記複数のパレット台車上に積層された焼結原料を前記複数のパレット台車が走行している間に連続的に燃焼させて焼結鉱を製造するために用いられる焼結鉱の焼結機であって、
　前記焼結ベッドの下方から排気を吸引して外部に排出するための主ブロアが設けられた排気ダクトと、
　前記複数のパレット台車の上方を覆う排ガス循環フードと、
　前記排気ダクトと前記排ガス循環フードとの間を接続する排ガス循環ダクトと、
　前記排ガス循環フードと前記床面との間の隙間を気密にシールする床面シール部とを備え、
　前記排ガス循環フードの内部を大気圧以下の圧力に保つよう構成されていることを特徴とする。 In order to solve the above-described problems, a sintered ore sintering machine of the present invention includes a sintering bed including a plurality of pallet carts that run on rails laid on a floor surface, and the plurality of pallet carts on the pallet carts. A sintered ore sintering machine used to produce a sintered ore by continuously burning the sintered raw material laminated on the plurality of pallet carts,
An exhaust duct provided with a main blower for sucking exhaust from below the sintered bed and discharging it to the outside;
An exhaust gas circulation hood that covers the top of the plurality of pallet trucks;
An exhaust gas circulation duct connecting between the exhaust duct and the exhaust gas circulation hood;
A floor surface seal portion that hermetically seals a gap between the exhaust gas circulation hood and the floor surface;
The inside of the exhaust gas circulation hood is configured to be maintained at a pressure equal to or lower than atmospheric pressure.
　上記焼結鉱の焼結機においては、前記排ガス循環フードが、固定フードと可動フードとを含み、前記可動フードを移動することにより少なくとも一部が開閉可能に構成されていてもよい。この場合、前記可動フードが閉鎖している状態において、前記可動フードと前記固定フードとの間の隙間をシールするフード間シール部を更に備えていてもよい。 In the sintered ore sintering machine, the exhaust gas circulation hood may include a fixed hood and a movable hood, and at least a part of the sinter ore can be opened and closed by moving the movable hood. In this case, in a state where the movable hood is closed, an inter-hood seal portion that seals a gap between the movable hood and the fixed hood may be further provided.
　上記焼結鉱の焼結機においては、前記排ガス循環フードが設けられている部分の排気の少なくとも一部を、前記排ガス循環ダクトを通して前記排ガス循環フードに戻すよう構成されていてもよい。 In the sintered ore sintering machine, at least a part of the exhaust gas in the portion where the exhaust gas circulation hood is provided may be returned to the exhaust gas circulation hood through the exhaust gas circulation duct.
　上記焼結鉱の焼結機においては、前記排気ダクトに設けられた主集塵機を更に備え、
　前記主集塵機は、排ガスの流れ方向における前記主ブロアの上流側に設けられており、
　前記排ガス循環ダクトは、前記主集塵機と前記主ブロアとの間の部分で前記排気ダクトに接続されていてもよい。 In the sintered ore sintering machine, further comprising a main dust collector provided in the exhaust duct,
The main dust collector is provided on the upstream side of the main blower in the flow direction of the exhaust gas,
The exhaust gas circulation duct may be connected to the exhaust duct at a portion between the main dust collector and the main blower.
　上記焼結鉱の焼結機においては、外気を取り入れる吸気口が前記排ガス循環ダクトに設けられていてもよい。この場合、上記焼結鉱の焼結機においては、前記排ガス循環ダクトは、前記排気ダクトとの接続部と前記吸気口との間の部分から分岐する分岐ダクトを更に備え、
前記分岐ダクトは、前記パレット台車の上端よりも低い位置で、前記排ガス循環フードにより覆われた空間に連通していてもよい。 In the sintered ore sintering machine, an intake port for taking in outside air may be provided in the exhaust gas circulation duct. In this case, in the sintered ore sintering machine, the exhaust gas circulation duct further includes a branch duct that branches from a portion between the connection with the exhaust duct and the intake port,
The branch duct may be communicated with a space covered with the exhaust gas circulation hood at a position lower than an upper end of the pallet carriage.
　上記焼結鉱の焼結機においては、前記排ガス循環フードの長手方向両端部のうちの少なくとも一方にガスシール室が設けられており、該ガスシール室には前記排ガス循環ダクトが接続されていない構成としてもよい。 In the sintered ore sintering machine, a gas seal chamber is provided in at least one of the longitudinal ends of the exhaust gas circulation hood, and the exhaust gas circulation duct is not connected to the gas seal chamber. It is good also as a structure.
　上記焼結鉱の焼結機においては、前記ガスシール室には前記ガスシール室内のガスを吸引する吸引ブロアに接続された吸引ダクトが接続されていてもよい。 In the sintered ore sintering machine, a suction duct connected to a suction blower that sucks gas in the gas seal chamber may be connected to the gas seal chamber.
　上記焼結鉱の焼結機においては、前記ガスシール室が、前記排ガス循環フードと前記複数のパレット台車及び前記床面との間の隙間を塞ぐ外側遮蔽部材と、前記排ガス循環フードの長手方向における前記外側遮蔽部材の内側に設けられ、前記排ガス循環フードと前記複数のパレット台車及び前記床面との間の隙間を塞ぐ内側遮蔽部材とにより形成されていてもよい。 In the sintered ore sintering machine, the gas seal chamber includes an outer shielding member that closes a gap between the exhaust gas circulation hood and the plurality of pallet trucks and the floor surface, and a longitudinal direction of the exhaust gas circulation hood The inner shielding member may be formed inside the outer shielding member in order to close a gap between the exhaust gas circulation hood and the plurality of pallet trucks and the floor surface.
　本発明の焼結鉱の焼結機は、床面上に敷設された軌条の上を走行する複数のパレット台車を含む焼結ベッドを備え、複数のパレット台車上に積層された焼結原料を複数のパレット台車が走行している間に連続的に燃焼させて焼結鉱を製造するために用いられるものであり、焼結ベッドの下方から排気を吸引して外部に排出するための主ブロアが設けられた排気ダクトと、複数のパレット台車の上方を覆う排ガス循環フードと、排気ダクトと前記排ガス循環フードとの間を接続する排ガス循環ダクトと、排ガス循環フードと床面との間の隙間を気密にシールする床面シール部とを備え、排ガス循環フードの内部を大気圧以下の圧力に保つよう構成されている。このように、従来のような可動側（パレット台車）と排ガス循環フード（固定側）との間ではなく、共に固定側である床面と排ガス循環フードとの間に床面シール部が設けられるため、シール性を十分に高めることができる。また、排ガス循環フードの内部を大気圧以下の圧力に保つよう構成されていることで、外部への排ガスの漏出を効果的に抑制することができる。 The sintered ore sintering machine of the present invention includes a sintering bed including a plurality of pallet trucks that run on rails laid on a floor surface, and a sintered raw material laminated on the plurality of pallet trucks. A main blower used to produce sintered ore by continuously burning while a plurality of pallet trucks are running, and sucking exhaust from below the sintering bed and discharging it to the outside An exhaust duct provided with an exhaust gas, an exhaust gas circulation hood that covers the top of the plurality of pallet trucks, an exhaust gas circulation duct that connects the exhaust duct and the exhaust gas circulation hood, and a gap between the exhaust gas circulation hood and the floor surface And a floor seal portion that hermetically seals the exhaust gas circulation hood, and is configured to keep the inside of the exhaust gas circulation hood at a pressure equal to or lower than atmospheric pressure. Thus, the floor seal portion is provided not between the movable side (pallet carriage) and the exhaust gas circulation hood (fixed side) as in the prior art, but between the floor surface that is the fixed side and the exhaust gas circulation hood. Therefore, the sealing performance can be sufficiently improved. Moreover, since the inside of the exhaust gas circulation hood is configured to be maintained at a pressure equal to or lower than the atmospheric pressure, leakage of the exhaust gas to the outside can be effectively suppressed.
　さらに、従来、パレット台車の下方から風箱内への漏風が排気と混合して排気ダクトから排出されて排ガスの体積を不要に増加させてしまっていたが、この漏風が外気ではなく排気ダクトを通して循環される循環排ガスで置き換えられるため、その分、排ガス循環量を増加させることができる。 Furthermore, conventionally, leakage from the bottom of the pallet truck into the wind box has been mixed with the exhaust and exhausted from the exhaust duct, causing the volume of exhaust gas to increase unnecessarily. Since the exhaust gas is replaced by the circulating exhaust gas, the exhaust gas circulation amount can be increased accordingly.
本発明の実施形態１に係る焼結鉱の焼結機の概略図である。It is the schematic of the sintering machine of the sintered ore which concerns on Embodiment 1 of this invention. 図１に示した焼結鉱の焼結機の排ガス循環フードの斜視図である。（ａ）は可動フードが閉じられている状態を示し、（ｂ）は可動フードが開かれている状態を示している。It is a perspective view of the exhaust gas circulation hood of the sintering machine of the sintered ore shown in FIG. (A) shows the state where the movable hood is closed, and (b) shows the state where the movable hood is opened. パレット台車とその下方に設置された風箱と上方に設置された排ガス循環フードの横断面図である。It is a cross-sectional view of a pallet truck, a wind box installed below it, and an exhaust gas circulation hood installed above. 図３のＥ部の拡大図である。It is an enlarged view of the E section of FIG. 本発明の実施形態１に係る焼結鉱の焼結機が備える開閉式の排ガス循環フードを示す概略側面図である。（ａ）は可動フードが閉じられている状態を示し、（ｂ）は可動フードが開かれている状態を示している。It is a schematic side view which shows the open-close-type exhaust gas circulation hood with which the sintered ore sintering machine which concerns on Embodiment 1 of this invention is provided. (A) shows the state where the movable hood is closed, and (b) shows the state where the movable hood is opened. 開閉式の排ガス循環フードの変形例を示す概略側面図である。It is a schematic side view which shows the modification of an open / close type exhaust gas circulation hood. 本発明の実施形態２に係る焼結鉱の焼結機が備える排ガス循環フードの概略図である。It is the schematic of the exhaust gas circulation hood with which the sintering machine of the sintered ore which concerns on Embodiment 2 of this invention is provided.
　本発明の実施形態に係る焼結鉱の焼結機５０について、図面を参照しながら説明する。 A sintered ore sintering machine 50 according to an embodiment of the present invention will be described with reference to the drawings.
（実施形態１）
　図１～４に示すように、本発明の焼結鉱の焼結機５０は、床面５上に敷設された軌条７の上を走行する複数のパレット台車６ａを含む焼結ベッド６を備え、複数のパレット台車６ａ上に積層された焼結原料を複数のパレット台車６ａが走行している間に連続的に燃焼させて焼結鉱を製造するために用いられるものであり、焼結ベッド６の下方から排気を吸引して外部に排出するための主ブロア１４が設けられた排気ダクト２と、複数のパレット台車６ａの上方を覆う排ガス循環フード１と、排気ダクト２と排ガス循環フード１との間を接続する排ガス循環ダクト３と、排ガス循環フード１と床面５との間の隙間を気密にシールするシール部材４とを備え、排ガス循環フード１の内部を大気圧以下の圧力に保つよう構成されている。尚、排ガス循環フード１の内部が大気圧以下の圧力に保たれていれば、外部への排ガスの漏出を効果的に抑制することができるが、排ガスの漏出をより効果的に抑制するためには、排ガス循環フード１の内部を負圧に保つことが好ましい。 (Embodiment 1)
As shown in FIGS. 1 to 4, a sintered ore sintering machine 50 according to the present invention includes a sintering bed 6 including a plurality of pallet trucks 6 a that run on rails 7 laid on a floor surface 5. The sintered raw material laminated on the plurality of pallet trucks 6a is used for continuously burning while the plurality of pallet trucks 6a are traveling to produce sintered ore, 6, an exhaust duct 2 provided with a main blower 14 for sucking exhaust gas from the bottom and exhausting it to the outside, an exhaust gas circulation hood 1 covering the upper side of the plurality of pallet trucks 6 a, an exhaust duct 2, and an exhaust gas circulation hood 1 The exhaust gas circulation duct 3 is connected to each other, and a seal member 4 that hermetically seals the gap between the exhaust gas circulation hood 1 and the floor surface 5, and the interior of the exhaust gas circulation hood 1 is set to a pressure below atmospheric pressure. Configured to keep. In addition, if the inside of the exhaust gas circulation hood 1 is maintained at a pressure equal to or lower than the atmospheric pressure, the leakage of the exhaust gas to the outside can be effectively suppressed, but in order to more effectively suppress the leakage of the exhaust gas. It is preferable to keep the inside of the exhaust gas circulation hood 1 at a negative pressure.
　排ガス循環フード１は、焼結ベッド６の移動方向における給鉱装置１７及び点火装置１８の下流側に設けられ、複数の固定フード１ａと複数の可動フード１ｂとを含むものであり、可動フード１ｂを移動させることにより少なくとも一部が開閉可能に構成されている。そのため、シール部材４は、可動フード１ｂと床面５との間の隙間をシールする床面シール板４ａと、可動フード１ｂと固定フード１ａとの間の隙間をシールするフード間シール板４ｂとを含む。床面シール板４ａは、全体が可動フード１ｂの下端よりも下方に延出して設けられており、下端面が床面５と摺動可能に接触している。一方、フード間シール板４ｂは、内側面全体が固定フードと摺動可能に接触している。 The exhaust gas circulation hood 1 is provided on the downstream side of the feeding device 17 and the ignition device 18 in the moving direction of the sintering bed 6, and includes a plurality of fixed hoods 1a and a plurality of movable hoods 1b. At least a part is configured to be openable and closable by moving. Therefore, the seal member 4 includes a floor seal plate 4a that seals a gap between the movable hood 1b and the floor surface 5, and an inter-hood seal plate 4b that seals a gap between the movable hood 1b and the fixed hood 1a. including. The entire floor surface seal plate 4a extends below the lower end of the movable hood 1b, and the lower end surface is slidably in contact with the floor surface 5. On the other hand, the entire inner surface of the inter-hood seal plate 4b is slidably in contact with the fixed hood.
　固定フード１ａと可動フード１ｂとには、それぞれ固定フードリブ３５と可動フードリブ３７とが設けられて強度が保たれている。また、固定フードの下端部には固定フード基礎部材３６が設けられており、この部分が気密かつ強固に床面５に固定されている。また、排ガス循環フード１の長手方向における両端部においては、端部遮蔽部材２５によって排ガス循環フード１と複数のパレット台車６ａ及び床面５との間の隙間が塞がれている。 The fixed hood 1a and the movable hood 1b are each provided with a fixed hood rib 35 and a movable hood rib 37 to maintain strength. A fixed hood foundation member 36 is provided at the lower end of the fixed hood, and this portion is fixed to the floor surface 5 in an airtight and firm manner. Further, at both ends in the longitudinal direction of the exhaust gas circulation hood 1, gaps between the exhaust gas circulation hood 1 and the plurality of pallet trucks 6 a and the floor surface 5 are closed by the end shielding members 25.
　図３、図４に示すように、床面シール板４ａは、可動フード１ｂの下側縁部に沿って設けられ、可動フード１ｂに固定されている。また、図３～５に示すように、フード間シール板４ｂは、排ガス循環フード１の長手方向における可動フード１ｂの一端部であって、可動フード１ｂの閉鎖状態において固定フード１ａと重なる部分に沿って設けられ、可動フード１ｂに固定されている。 3 and 4, the floor seal plate 4a is provided along the lower edge of the movable hood 1b and is fixed to the movable hood 1b. As shown in FIGS. 3 to 5, the inter-hood seal plate 4b is one end of the movable hood 1b in the longitudinal direction of the exhaust gas circulation hood 1 and overlaps the fixed hood 1a when the movable hood 1b is closed. It is provided along and is fixed to the movable hood 1b.
　本発明の床面シール部は、本実施形態１の場合には、固定フード１ａの下端部、即ち固定フード１ａと床面５との間をシールする部分と、可動フード１ｂに設けられた床面シール板４ａとを含むものである。一方、全体を固定フードのみで開閉不可能に構成する場合には、固定フード１ａの下端部が本発明の床面シール部として機能する。
　また、本実施形態１においては、フード間シール板４ｂがフード間シール部として機能する。 In the case of the first embodiment, the floor seal portion of the present invention is a lower end portion of the fixed hood 1a, that is, a portion that seals between the fixed hood 1a and the floor surface 5, and a floor provided on the movable hood 1b. And a face seal plate 4a. On the other hand, in the case where the entire structure is configured so that it cannot be opened and closed with only the fixed hood, the lower end portion of the fixed hood 1a functions as the floor seal portion of the present invention.
In the first embodiment, the inter-hood seal plate 4b functions as an inter-hood seal portion.
　図１に示すように、焼結ベッド６の下方には、排ガス循環フード１の長手方向に沿って複数の風箱２２が並べて配置されており、これらの風箱２２に排気ダクト２が接続されている。排気ダクト２には、主集塵機２０が設けられており、その後段に設けられた主ブロア１４によって排ガスの一部が排ガス処理装置（不図示）に送られる。 As shown in FIG. 1, a plurality of wind boxes 22 are arranged side by side along the longitudinal direction of the exhaust gas circulation hood 1 below the sintering bed 6, and the exhaust duct 2 is connected to these wind boxes 22. ing. A main dust collector 20 is provided in the exhaust duct 2, and a part of the exhaust gas is sent to an exhaust gas treatment device (not shown) by a main blower 14 provided in the subsequent stage.
　排ガス循環ダクト３は、主集塵機２０と主ブロア１４との間の部分で排気ダクト２に接続されている。排ガス循環ダクト３には循環ブロア１５が設けられており、排気ダクト２を流れる排ガスの一部がこれにより吸引され、排ガス循環ダクト３を通して排ガス循環フード１に戻される。このように、循環排ガスを主集塵機２０の後段から排ガス循環フード１内に送ることで、排ガス循環フード１内の環境をクリーンに保ち、フード内を走行するパレット台車６ａへの負荷を減らして寿命を向上させる効果が得られる。尚、主集塵機２０としては、電気集塵機やバグフィルターを用いることができる。 The exhaust gas circulation duct 3 is connected to the exhaust duct 2 at a portion between the main dust collector 20 and the main blower 14. A circulation blower 15 is provided in the exhaust gas circulation duct 3, and a part of the exhaust gas flowing through the exhaust duct 2 is sucked by this and returned to the exhaust gas circulation hood 1 through the exhaust gas circulation duct 3. In this way, circulating exhaust gas is sent from the rear stage of the main dust collector 20 into the exhaust gas circulation hood 1 to keep the environment in the exhaust gas circulation hood 1 clean and reduce the load on the pallet truck 6a traveling in the hood. The effect which improves is acquired. In addition, as the main dust collector 20, an electric dust collector and a bag filter can be used.
　本実施形態１においては、排ガス循環ダクト３には外気を取り入れる吸気口１１が設けられており、吸気ブロア１６によって外気を循環排ガスに混合させることができる。これにより、焼結原料層を通すことで焼結のために用いられる燃焼用ガス（空気と循環排ガスとの混合ガス）の酸素濃度を調節することができる。また、排ガス循環フード１内に送られる循環排ガスの温度を下げることで排ガス循環フード１内の高温化を防止し、パレット台車等の内部構成要素が高温により受けるダメージを抑制することもできる。 In the first embodiment, the exhaust gas circulation duct 3 is provided with an intake port 11 for taking in outside air, and the outside air can be mixed with the circulating exhaust gas by the intake blower 16. Thereby, the oxygen concentration of the combustion gas (mixed gas of air and circulating exhaust gas) used for sintering can be adjusted by passing the sintering raw material layer. Further, by lowering the temperature of the circulating exhaust gas sent into the exhaust gas circulation hood 1, it is possible to prevent the exhaust gas circulation hood 1 from being heated at a high temperature, and to suppress damage to internal components such as a pallet truck due to the high temperature.
　また、排ガス循環フードが設けられている部分に対応する位置の風箱から排出される排気の全てを系外に排出すると共に、排ガス循環フードが設けられていない部分に対応する位置の風箱から排出される排気をダクトを通して排ガス循環フードに戻す従来の構成と異なり、本実施形態１においては、排ガス循環フード１が設けられている部分の排気の全てを排気ダクト２により吸引するが、そのうちの一部を排気ダクト２に接続された排ガス循環ダクト３を通して排ガス循環フード１に戻すよう構成されている。これにより、排ガス循環フード１を焼結ベッド６の長手方向における略全面に設置することができる。さらに、従来の構成ではパレット台車６ａの下方から風箱内へと漏風していた外気の多くを循環排ガスで置き換えられる効果も得られる。そのため、上記従来の構成に比して排ガス循環量を増加させることができる。
　さらに本実施形態１においては、排ガス循環ダクト３は、排気ダクト２との接続部と吸気口１１との間の部分から分岐する分岐ダクト３ａを更に備え、分岐ダクト３ａは、台車車輪８の近傍の位置で床面から排ガス循環フード１により覆われた空間に連通している。ここで、排ガス循環フード１により覆われた空間とは、排ガス循環フード１の内側の空間であって、主として排ガス循環フード１、床面、パレット台車６ａによって画成される空間を意味している。
　分岐ダクト３ａは、排ガス循環ダクト３のうち循環排ガスの流れ方向における吸気口１１よりも上流側で排ガス循環ダクト３から分岐しているため、分岐ダクト３ａを流れる循環排ガスには外気が混入されない。
　移動体であるパレット台車６ａと固定体である風箱２２との間は、互いに接触した状態で摺動するシール部材である台車側摺動部材６ｂと風箱側レール部材２２ｂとによって気密性が保たれるようになっているが、この部分に漏風が発生すると、パレット台車６ａに積載された焼結原料層を通らずにパレット台車６ａの周囲のガスが風箱２２に流れ込む。本実施形態１のように分岐ダクト３ａを通して外気が混入されていない循環排ガスをパレット台車６ａの上端よりも低い位置において排ガス循環フード１により覆われた空間内に戻すことにより、外気が混入されて焼結原料を燃焼させるのに必要な量の酸素を含む循環排ガスをパレット台車６ａの上方に供給すると共に、パレット台車６ａ下方からの漏風分については外気が混入されていない循環排ガスの割合を高めることができる。
　これにより、焼結原料を燃焼させるのに必要な酸素量を含む循環排ガスをパレット台車上方から焼結原料層に供給することができるとともに、排ガス循環量を極力増大させることで系外に放出する排ガス量を抑えることができる。 In addition, all the exhaust discharged from the wind box at the position corresponding to the part where the exhaust gas circulation hood is provided is exhausted outside the system, and from the wind box at the position corresponding to the part where the exhaust gas circulation hood is not provided. Unlike the conventional configuration in which exhausted exhaust gas is returned to the exhaust gas circulation hood through the duct, in the first embodiment, all of the exhaust gas in the portion where the exhaust gas circulation hood 1 is provided is sucked by the exhaust duct 2. A part of the exhaust gas is returned to the exhaust gas circulation hood 1 through the exhaust gas circulation duct 3 connected to the exhaust duct 2. Thereby, the exhaust gas circulation hood 1 can be installed on substantially the entire surface in the longitudinal direction of the sintering bed 6. Furthermore, in the conventional configuration, it is possible to obtain an effect that most of the outside air that has leaked from the bottom of the pallet truck 6a into the wind box can be replaced with the circulating exhaust gas. Therefore, the exhaust gas circulation rate can be increased as compared with the conventional configuration.
Further, in the first embodiment, the exhaust gas circulation duct 3 further includes a branch duct 3 a that branches from a portion between the connection portion with the exhaust duct 2 and the intake port 11, and the branch duct 3 a is near the carriage wheel 8. From the floor surface to the space covered by the exhaust gas circulation hood 1 at the position of. Here, the space covered with the exhaust gas circulation hood 1 means a space inside the exhaust gas circulation hood 1 and mainly defined by the exhaust gas circulation hood 1, the floor surface, and the pallet truck 6a. .
Since the branch duct 3a is branched from the exhaust gas circulation duct 3 upstream of the intake port 11 in the flow direction of the circulating exhaust gas in the exhaust gas circulation duct 3, no outside air is mixed into the circulating exhaust gas flowing through the branch duct 3a.
Between the pallet truck 6a which is a moving body and the wind box 22 which is a fixed body, airtightness is achieved by the carriage side sliding member 6b and the wind box side rail member 22b which are seal members that slide in contact with each other. However, if air leakage occurs in this portion, the gas around the pallet truck 6a flows into the wind box 22 without passing through the sintering material layer loaded on the pallet truck 6a. Returning the circulating exhaust gas not mixed with outside air through the branch duct 3a as in the first embodiment into the space covered by the exhaust gas circulating hood 1 at a position lower than the upper end of the pallet truck 6a, the outside air is mixed. A circulating exhaust gas containing oxygen necessary for burning the sintering raw material is supplied to the upper side of the pallet truck 6a, and the ratio of the circulating exhaust gas not mixed with outside air is increased with respect to the air leakage from the lower side of the pallet truck 6a. be able to.
As a result, circulating exhaust gas containing the amount of oxygen necessary to burn the sintering raw material can be supplied to the sintering raw material layer from above the pallet truck, and discharged outside the system by increasing the exhaust gas circulation amount as much as possible. The amount of exhaust gas can be suppressed.
　次に、図５を参照して本実施形態１に係る焼結鉱の焼結機５０が備える開閉式の排ガス循環フード１の動作について説明する。尚、図５においては、簡略化のために、内部を通る焼結ベッド６（パレット台車６ａ）の図示は省略している。 Next, the operation of the openable exhaust gas circulation hood 1 provided in the sintered ore sintering machine 50 according to the first embodiment will be described with reference to FIG. In FIG. 5, for the sake of simplicity, the illustration of the sintered bed 6 (pallet carriage 6a) passing through the interior is omitted.
　図５（ａ）は、可動フード１ｂが閉じられている状態を示している。本実施形態１においては、可動フード１ｂは各開放箇所毎に２つずつ設けられており、２つの可動フード１ｂがそれらの間で突き合わされて開放箇所を閉じられるようになっている。この状態においては、可動フード１ｂと床面５との間の隙間は床面シール板４ａによってシールされ、可動フード１ｂと固定フード１ａとの間の隙間はフード間シール板４ｂによってシールされていて、排ガス循環フード１の内部の気密性が保たれている。 FIG. 5A shows a state where the movable hood 1b is closed. In the first embodiment, two movable hoods 1b are provided for each open location, and the two movable hoods 1b are abutted between them to close the open locations. In this state, the gap between the movable hood 1b and the floor 5 is sealed by the floor seal plate 4a, and the gap between the movable hood 1b and the fixed hood 1a is sealed by the inter-hood seal plate 4b. The airtightness inside the exhaust gas circulation hood 1 is maintained.
　図５（ｂ）は、可動フード１ｂが開かれている状態を示している。このように、可動フード１ｂは、下端に設けられた可動フード車輪１０によって固定フード１ａに沿って移動可能となっており、２つの可動フード１ｂが互いに反対方向に移動されることにより、大きな開放長さＬｏが確保される。これにより、パレット交換等の保全作業を容易かつ効率的に行うことが可能となる。このような開閉式の排ガス循環フードは、全長に渡ってパレット台車等の移動体との間でシールするということが要求されない本願発明の構成により可能となる。 FIG. 5B shows a state where the movable hood 1b is opened. Thus, the movable hood 1b can be moved along the fixed hood 1a by the movable hood wheel 10 provided at the lower end, and the two movable hoods 1b are moved in opposite directions to greatly open. The length Lo is ensured. Thereby, maintenance work such as pallet replacement can be performed easily and efficiently. Such an open / close type exhaust gas circulation hood is made possible by the configuration of the present invention which does not require sealing with a moving body such as a pallet truck over the entire length.
（変形例）
　図６は、実施形態１の開閉式の排ガス循環フード１の変形例を示している。本変形例の排ガス循環フード１においては、可動フード１ｂは各開放箇所毎に１つずつ設けられており、各可動フード１ｂはその全体が吊りワイヤ１００等によって上方に持ち上げられるようになっている。 (Modification)
FIG. 6 shows a modification of the openable exhaust gas circulation hood 1 of the first embodiment. In the exhaust gas circulation hood 1 of this modification, one movable hood 1b is provided for each open portion, and each movable hood 1b is lifted upward by a suspension wire 100 or the like. .
　本変形例は、上記実施形態１の構成と比べると可動フード１ｂを開閉しにくい面はあるものの、開口長さＬｏを約２倍にすることができる長所がある。 This modification has an advantage that the opening length Lo can be approximately doubled although there is a face that makes it difficult to open and close the movable hood 1b as compared with the configuration of the first embodiment.
（実施形態２）
　次に、図７を参照して本発明の実施形態２に係る焼結鉱の焼結機が備える排ガス循環フード１について、上記実施形態１と相違する部分を説明する。 (Embodiment 2)
Next, with respect to the exhaust gas circulation hood 1 included in the sintered ore sintering machine according to the second embodiment of the present invention, a part different from the first embodiment will be described with reference to FIG.
　本実施形態２においては、排ガス循環フード１の長手方向両端部にガスシール室３０が設けられており、ガスシール室３０には内部のガスを吸引する吸引ブロア３３に接続された吸引ダクト３４が接続されている。ガスシール室３０は、排ガス循環フード１と複数のパレット台車６ａ及び床面５との間の隙間を塞ぐ外側遮蔽部材３１と、排ガス循環フードの長手方向における外側遮蔽部材３１の内側に設けられ、排ガス循環フード１と複数のパレット台車６ａ及び床面５との間の隙間を塞ぐ内側遮蔽部材３２とにより形成されている。 In the second embodiment, gas seal chambers 30 are provided at both ends in the longitudinal direction of the exhaust gas circulation hood 1. The gas seal chamber 30 has suction ducts 34 connected to a suction blower 33 that sucks the internal gas. It is connected. The gas seal chamber 30 is provided inside the outer shielding member 31 in the longitudinal direction of the exhaust gas circulation hood, and the outer shielding member 31 that closes the gap between the exhaust gas circulation hood 1 and the plurality of pallet trucks 6a and the floor surface 5. The exhaust gas circulation hood 1 is formed by an inner shielding member 32 that closes gaps between the pallet truck 6 a and the floor surface 5.
　図７の矢印Ａ～Ｄは、漏風と吸引とによる流量バランスを説明するためのものである。排ガス循環フード１の長手方向両端部においては、隙間のシールが非常に困難であるが、図７に示すように、ガスシール室３０には排ガス循環ダクト３が接続されておらず、循環排ガスが送られないようになっており、これにより、排ガス循環フード１の長手方向両端部における循環排ガスに対するシールが２重になることに加え、ガスシール室３０内では外側遮蔽部材３１側からの漏風Ａと内側遮蔽部材３２側からの漏風Ｂとが、環境集塵機２１に接続された吸引ダクト３４側の吸引Ｃと風箱２２側の吸引Ｄとによって外部に漏れないこととなる。例えば、排ガス循環フード１の内側遮蔽部材３２より内側の圧力が大気圧ならば、漏風Ａ＝漏風Ｂである。また、排ガス循環フード１の内側遮蔽部材３２より内側の圧力が負圧であれば、漏風Ａ＞漏風Ｂである。 The arrows A to D in FIG. 7 are for explaining the flow rate balance due to air leakage and suction. It is very difficult to seal the gap at both ends in the longitudinal direction of the exhaust gas circulation hood 1, but as shown in FIG. 7, the exhaust gas circulation duct 3 is not connected to the gas seal chamber 30, and the exhaust gas is not As a result, the seal against the circulating exhaust gas at both ends in the longitudinal direction of the exhaust gas circulation hood 1 is doubled, and in addition, the air leakage A from the outer shielding member 31 side in the gas seal chamber 30 The air leakage B from the inner shielding member 32 side does not leak to the outside by the suction C on the suction duct 34 side connected to the environmental dust collector 21 and the suction D on the wind box 22 side. For example, if the pressure inside the inner shielding member 32 of the exhaust gas circulation hood 1 is atmospheric pressure, the air leakage A = the air leakage B. Further, if the pressure inside the inner shielding member 32 of the exhaust gas circulation hood 1 is a negative pressure, the air leakage A> the air leakage B.
　尚、ガスシール室３０には、環境集塵機２１に接続された吸引ダクト３４を接続して内部のガスを吸引することで、ガスシール室３０の負圧度を高めて外部への漏風防止効果を高めることができ好ましいが、このような吸引ダクト３４が接続されていなくとも、ガスシール室３０を設けて吸引Ｄだけで内部のガスを吸引することによっても漏風防止効果は得られる。 The gas seal chamber 30 is connected to a suction duct 34 connected to the environmental dust collector 21 to suck the internal gas, thereby increasing the negative pressure of the gas seal chamber 30 and preventing the outside air leakage. However, even if such a suction duct 34 is not connected, the air leakage prevention effect can also be obtained by providing the gas seal chamber 30 and sucking the internal gas only by the suction D.
　以上、本発明を実施形態を用いて説明してきたが、本発明はこれらの実施形態の構成には限られない。本発明の範囲は添付の特許請求の範囲の記載に基づいて定まるものであり、その範囲内において構成要素の省略や変形、改良を施した構成の全てが本発明に含まれる。 As mentioned above, although this invention has been demonstrated using embodiment, this invention is not restricted to the structure of these embodiment. The scope of the present invention is determined based on the description of the appended claims, and all configurations in which the components are omitted, modified, or improved within the scope are included in the present invention.
　例えば、上記の各実施形態及び変形例においては、排ガス循環ダクト３は、排気ダクト２との接続部と吸気口１１との間の部分から分岐する分岐ダクト３ａを備え、台車車輪８の近傍の位置で床面から排ガス循環フード１により覆われた空間に連通しているが、これは、パレット台車６ａと風箱２２との間のシール部分（台車側摺動部材６ｂと風箱側レール部材２２ｂ）の近傍に外気が混入されていない循環排ガスを戻すことで、パレット台車６ａの下方から風箱内への漏風分のうち、この外気が混入されていない循環排ガスの割合を高くすることができる好ましい形態である。即ち、分岐ダクト３ａは、パレット台車６ａの上端よりも低い位置で排ガス循環フード１により覆われた空間に連通していればよく、例えば、パレット台車６ａの上端よりも低い位置において排ガス循環フード１の側面に接続されていてもよい。また、分岐ダクト３ａは設けられていなくともよい。 For example, in each of the above-described embodiments and modifications, the exhaust gas circulation duct 3 includes a branch duct 3 a that branches from a portion between the connection portion with the exhaust duct 2 and the intake port 11, and is located in the vicinity of the carriage wheel 8. This is communicated from the floor surface to the space covered by the exhaust gas circulation hood 1 at a position where a seal portion between the pallet carriage 6a and the wind box 22 (the carriage side sliding member 6b and the wind box side rail member) is connected. 22b), by returning the circulating exhaust gas that is not mixed with outside air, the ratio of the circulating exhaust gas that is not mixed with outside air in the air leakage from the bottom of the pallet truck 6a into the wind box may be increased. This is a preferable form. That is, the branch duct 3a only needs to communicate with the space covered with the exhaust gas circulation hood 1 at a position lower than the upper end of the pallet truck 6a. For example, the exhaust gas circulation hood 1 at a position lower than the upper end of the pallet truck 6a. It may be connected to the side surface. Further, the branch duct 3a may not be provided.
　　１　排ガス循環フード
　１ａ　固定フード
　１ｂ　可動フード
　　２　排気ダクト
　　３　排ガス循環ダクト
　３ａ　分岐ダクト
　　４　シール部材
　４ａ　床面シール板
　４ｂ　フード間シール板
　　５　床面
　　６　燒結ベッド
　６ａ　パレット台車
　６ｂ　台車側摺動部材
　　７　軌条
　　８　台車車輪
　　９　焼結原料層
　１０　可動フード車輪
　１１　吸気口
　１４　主ブロア
　１５　循環ブロア
　１６　吸気ブロア
　１７　給鉱装置
　１８　点火装置
　２０　集塵機
　２２　風箱
　２２ｂ　風箱側レール部材
　２５　端部遮蔽部材
　３０　ガスシール室
　３１　外側遮蔽部材
　３２　内側遮蔽部材
　３３　吸引ブロア
　３４　吸引ダクト
　３５　固定フードリブ
　３６　固定フード基礎部材
　３７　可動フードリブ
　５０　焼結機
１００　吊りワイヤ DESCRIPTION OF SYMBOLS 1 Exhaust gas circulation hood 1a Fixed hood 1b Movable hood 2 Exhaust gas duct 3 Exhaust gas circulation duct 3a Branching duct 4 Sealing member 4a Floor surface sealing plate 4b Inter-hood sealing plate 5 Floor surface 6 Consolidation bed 6a Pallet cart 6b Cart side sliding member 7 Rail 8 bogie wheel 9 sintering raw material layer 10 movable hood wheel 11 air inlet 14 main blower 15 circulation blower 16 air intake blower 17 feeding device 18 ignition device 20 dust collector 22 wind box 22b wind box side rail member 25 end shielding member 30 gas seal Chamber 31 Outer shielding member 32 Inner shielding member 33 Suction blower 34 Suction duct 35 Fixed hood rib 36 Fixed hood base member 37 Movable hood rib 50 Sintering machine 100 Hanging wire

Claims (10)

  1. 　床面上に敷設された軌条の上を走行する複数のパレット台車を含む焼結ベッドを備え、前記複数のパレット台車上に積層された焼結原料を前記複数のパレット台車が走行している間に連続的に燃焼させて焼結鉱を製造するために用いられる焼結鉱の焼結機であって、
    　前記焼結ベッドの下方から排気を吸引して外部に排出するための主ブロアが設けられた排気ダクトと、
    　前記複数のパレット台車の上方を覆う排ガス循環フードと、
    　前記排気ダクトと前記排ガス循環フードとの間を接続する排ガス循環ダクトと、
    　前記排ガス循環フードと前記床面との間の隙間を気密にシールする床面シール部とを備え、
    　前記排ガス循環フードの内部を大気圧以下の圧力に保つよう構成されていることを特徴とする焼結鉱の焼結機。     A sintering bed including a plurality of pallet carts that run on rails laid on the floor surface, and while the plurality of pallet carts are running the sintering raw material stacked on the plurality of pallet carts A sintered ore sintering machine used to produce sintered ore by continuously burning to
    An exhaust duct provided with a main blower for sucking exhaust from below the sintered bed and discharging it to the outside;
    An exhaust gas circulation hood that covers the top of the plurality of pallet trucks;
    An exhaust gas circulation duct connecting between the exhaust duct and the exhaust gas circulation hood;
    A floor surface seal portion that hermetically seals a gap between the exhaust gas circulation hood and the floor surface;
    A sintered ore sintering machine configured to keep the inside of the exhaust gas circulation hood at a pressure equal to or lower than atmospheric pressure.
  2. 　前記排ガス循環フードが、固定フードと可動フードとを含み、前記可動フードを移動することにより少なくとも一部が開閉可能に構成されていることを特徴とする請求項１に記載の焼結鉱の焼結機。 2. The sintered ore firing according to claim 1, wherein the exhaust gas circulation hood includes a fixed hood and a movable hood, and is configured such that at least a part thereof can be opened and closed by moving the movable hood. The machine.
  3. 　前記可動フードが閉鎖している状態において、前記可動フードと前記固定フードとの間の隙間をシールするフード間シール部を更に備えることを特徴とする請求項２に記載の焼結鉱の焼結機。 The sintered ore sintering according to claim 2, further comprising an inter-hood seal portion that seals a gap between the movable hood and the fixed hood when the movable hood is closed. Machine.
  4. 　前記排ガス循環フードが設けられている部分の排気の少なくとも一部を、前記排ガス循環ダクトを通して前記排ガス循環フードに戻すよう構成されていることを特徴とする請求項１から３のいずれか１項に記載の焼結鉱の焼結機。 4. The apparatus according to claim 1, wherein at least a part of exhaust gas in a portion where the exhaust gas circulation hood is provided is configured to return to the exhaust gas circulation hood through the exhaust gas circulation duct. 5. Sintered ore sintering machine as described.
  5. 　前記排気ダクトに設けられた主集塵機を更に備え、
    　前記主集塵機は、排ガスの流れ方向における前記主ブロアの上流側に設けられており、
    　前記排ガス循環ダクトは、前記主集塵機と前記主ブロアとの間の部分で前記排気ダクトに接続されていることを特徴とする請求項１から４のいずれか１項に記載の焼結鉱の焼結機。     Further comprising a main dust collector provided in the exhaust duct;
    The main dust collector is provided on the upstream side of the main blower in the flow direction of the exhaust gas,
    5. The sintered ore firing according to claim 1, wherein the exhaust gas circulation duct is connected to the exhaust duct at a portion between the main dust collector and the main blower. The machine.
  6. 　外気を取り入れる吸気口が前記排ガス循環ダクトに設けられていることを特徴とする請求項１から５のいずれか１項に記載の焼結鉱の焼結機。 6. The sintered ore sintering machine according to any one of claims 1 to 5, wherein an intake port for taking in outside air is provided in the exhaust gas circulation duct.
  7. 　前記排ガス循環ダクトは、前記排気ダクトとの接続部と前記吸気口との間の部分から分岐する分岐ダクトを更に備え、
    　前記分岐ダクトは、前記パレット台車の上端よりも低い位置で、前記排ガス循環フードにより覆われた空間に連通していることを特徴とする請求項６に記載の焼結鉱の焼結機。     The exhaust gas circulation duct further includes a branch duct that branches from a portion between the connection portion with the exhaust duct and the inlet.
    The sintered ore sintering machine according to claim 6, wherein the branch duct communicates with a space covered by the exhaust gas circulation hood at a position lower than an upper end of the pallet carriage.
  8. 　前記排ガス循環フードの長手方向両端部のうちの少なくとも一方にガスシール室が設けられており、該ガスシール室には前記排ガス循環ダクトが接続されていないことを特徴とする請求項１から７のいずれか１項に記載の焼結鉱の焼結機。 8. The gas seal chamber is provided in at least one of the longitudinal ends of the exhaust gas circulation hood, and the exhaust gas circulation duct is not connected to the gas seal chamber. The sintering machine of the sintered ore of any one of Claims 1.
  9. 　前記ガスシール室には前記ガスシール室内のガスを吸引する吸引ブロアに接続された吸引ダクトが接続されていることを特徴とする請求項８に記載の焼結鉱の焼結機。 The sintered ore sintering machine according to claim 8, wherein a suction duct connected to a suction blower for sucking a gas in the gas seal chamber is connected to the gas seal chamber.
  10. 　前記ガスシール室が、前記排ガス循環フードと前記複数のパレット台車及び前記床面との間の隙間を塞ぐ外側遮蔽部材と、前記排ガス循環フードの長手方向における前記外側遮蔽部材の内側に設けられ、前記排ガス循環フードと前記複数のパレット台車及び前記床面との間の隙間を塞ぐ内側遮蔽部材とにより形成されていることを特徴とする請求項８又は９に記載の焼結鉱の焼結機。 The gas seal chamber is provided on the inner side of the outer shielding member in the longitudinal direction of the exhaust gas circulation hood, and an outer shielding member that closes gaps between the exhaust gas circulation hood and the plurality of pallet trucks and the floor surface, 10. The sintered ore sintering machine according to claim 8, wherein the exhaust gas circulating hood is formed by an inner shielding member that closes a gap between the pallet truck and the floor surface. .
PCT/JP2018/005682 2017-02-27 2018-02-19 Sintering machine for sintered ore WO2018155368A1 (en)

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EP3587975A4 (en) 2020-01-01
TWI661169B (en) 2019-06-01
JP6816250B2 (en) 2021-01-20

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