WO2014045949A1 - スラグ除去装置及びスラグ除去方法 - Google Patents

スラグ除去装置及びスラグ除去方法 Download PDF

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Publication number
WO2014045949A1
WO2014045949A1 PCT/JP2013/074414 JP2013074414W WO2014045949A1 WO 2014045949 A1 WO2014045949 A1 WO 2014045949A1 JP 2013074414 W JP2013074414 W JP 2013074414W WO 2014045949 A1 WO2014045949 A1 WO 2014045949A1
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WO
WIPO (PCT)
Prior art keywords
slag
slag removal
pulverized coal
hot air
liquid
Prior art date
Application number
PCT/JP2013/074414
Other languages
English (en)
French (fr)
Japanese (ja)
Inventor
雅一 坂口
務 濱田
剛嗣 岡田
大本　節男
慶一 中川
Original Assignee
三菱重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 三菱重工業株式会社 filed Critical 三菱重工業株式会社
Priority to CN201380048341.XA priority Critical patent/CN104641003B/zh
Priority to DE112013004601.6T priority patent/DE112013004601T5/de
Priority to IN2076DEN2015 priority patent/IN2015DN02076A/en
Priority to KR20157006733A priority patent/KR20150044933A/ko
Priority to US14/428,907 priority patent/US20150240322A1/en
Publication of WO2014045949A1 publication Critical patent/WO2014045949A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/001—Injecting additional fuel or reducing agents
    • C21B5/003—Injection of pulverulent coal
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/16—Tuyéres
    • C21B7/163—Blowpipe assembly
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B7/00—Blast furnaces
    • C21B7/24—Test rods or other checking devices
    • 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
    • F27B1/00—Shaft or like vertical or substantially vertical furnaces
    • F27B1/10—Details, accessories or equipment specially adapted for furnaces of these types
    • 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
    • F27D25/00—Devices or methods for removing incrustations, e.g. slag, metal deposits, dust; Devices or methods for preventing the adherence of slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F27—FURNACES; KILNS; OVENS; RETORTS
    • F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
    • F27D3/00—Charging; Discharging; Manipulation of charge
    • F27D3/15—Tapping equipment; Equipment for removing or retaining slag
    • F27D3/1545—Equipment for removing or retaining slag

Definitions

  • the present invention relates to a slag removing device and a slag removing method for a blow pipe applied to a blast furnace facility, and in particular, a slag suitable for a blow pipe for blowing pulverized coal obtained by pulverizing low-grade coal as auxiliary fuel into a furnace together with hot air.
  • the present invention relates to a removing device and a slag removing method.
  • Patent Document 2 discloses that slag is removed by driving a solid ball into the tuyere from the furnace outer end of the tuyere.
  • Patent Document 3 discloses that a lance is vibrated by blowing a solid tip having a particle diameter of 1 to 2 mm in order to remove deposits accumulated in a gap formed at the tip of two lances. Has been.
  • Patent Document 1 The problem with the prior art disclosed in Patent Document 1 is that it is difficult to completely (uniformly) mix pulverized coal and a solid additive (a fossilizer), and as a result, the mixing ratio of the additive is That is, the formation of slag in a portion lower than the predetermined value cannot be prevented.
  • a new source of calcium oxide (CaO) such as limestone and serpentine is required, and thus there is a problem that extra costs are generated.
  • Patent Document 2 the problem with the prior art disclosed in Patent Document 2 is that not all solid balls collide with the slag. Therefore, if there is a solid ball that does not collide with the slag, this solid ball may collide directly with the inner surface of the blow pipe, and there is a concern that the pipe or the like may be damaged by the collision of the solid ball.
  • the target of the slag damaged by the solid ball is a blower tuyere and a heat insulating ring.
  • Patent Document 3 vibrates the lance and is difficult to apply to a blow pipe or tuyere.
  • the slag removing device for blow pipes applied to the blast furnace equipment enables slag removal easily and reliably with a simple device configuration without adjusting the softening point.
  • a slag removing device for blow pipes applied to blast furnace equipment reduces the risk of pipe breakage or the like as much as possible, and enables easy and reliable slag removal with the simplest possible device configuration.
  • the present invention has been made to solve the above-mentioned problems, and the object of the present invention is to remove slag easily and reliably with a simple apparatus configuration even when pulverized coal that does not adjust the softening point is used.
  • Another object of the present invention is to provide a slag removing device and a slag removing method for a blast furnace facility that can be achieved and further reduce the risk of pipe breakage and the like as much as possible.
  • the slag removing apparatus is provided in a blow pipe for blowing pulverized coal as auxiliary fuel together with hot air from the tuyere of a blast furnace body that manufactures pig iron from iron ore, and the hot air flows into the slag of the pulverized coal
  • a slag removal device for a blowpipe containing a component that melts by the combustion heat of the pulverized coal, wherein the pulverized coal flowing in the blowpipe and the hot air have a temperature in the vicinity of the tuyere.
  • An injection nozzle that blows a solid having a high melting point and a particle size larger than that of the pulverized coal is provided, and the injection nozzle includes a solid supply system that supplies the solid and is provided with an open / close control valve. .
  • a solid having a melting point higher than the temperature near the tuyere in the pulverized coal and hot air flowing in the blowpipe and having a particle size larger than that of the pulverized coal Since the injection nozzle for injecting an object is provided, and the injection nozzle is provided with a solid material supply system in which an open / close control valve is provided while supplying the solid material, the solid object blown into the blow pipe from the injection nozzle is It can be removed by melting the hot air flow as a driving force without melting and applying a mechanical impact to the slag adhering to the vicinity of the tuyere.
  • the flow of hot air can be used as the propulsion force of the solid matter in the blow pipe.
  • suitable solids include granular coal, slag, lime grains, pellet grains, sintered ore, iron powder, and the like, and one or more of these may be used in combination.
  • an injection nozzle that injects liquid toward a slag adhesion region in the blow pipe
  • the injection nozzle includes a liquid supply system that supplies liquid and is provided with an open / close control valve.
  • the solid slag adhering by liquid injection can be rapidly cooled and destroyed and removed by thermal contraction.
  • the solid injection nozzle and the liquid injection nozzle described above may be provided separately, or may be an integrated nozzle that can select the injection by switching the flow path by opening / closing the open / close control valve. .
  • a slag detection means for detecting a slag adhesion state by a differential pressure between the hot air pressure upstream of the injection nozzle and the hot air pressure in the vicinity of the outlet of the blow pipe is preferably provided.
  • Such slag detection means can detect that the adhesion of slag reduces the cross-sectional area of the flow path, and as a result, the differential pressure increases due to an increase in pressure loss.
  • the liquid and / or the solid matter is jetted by opening the open / close control valve and detected by the slag detection means
  • Said invention WHEREIN: It is preferable to provide the alarm output threshold value by which the said slag adhesion state was set to the value larger than the said slag removal threshold value. Thereby, it can be detected that the slag removal by the liquid jet nozzle or the jet nozzle is not performed as scheduled.
  • the slag removing method according to the second aspect of the present invention is provided in a blow pipe that blows pulverized coal of auxiliary fuel together with hot air from the tuyere of a blast furnace body that manufactures pig iron from iron ore, and the hot air is blown into the slag of the pulverized coal.
  • a slag removal method for a blow pipe containing a component that is melted by the combustion heat of the pulverized coal, from the temperature near the tuyere in the pulverized coal flowing in the blow pipe and the hot air
  • the solid matter having a melting point higher than the temperature near the tuyere and larger in particle diameter than the pulverized coal in the pulverized coal and hot air flowing in the blow pipe.
  • a first stage slag removal step in which a slag removal is performed by first injecting a liquid independently from the injection nozzle and an injection nozzle for injecting a liquid toward a slag adhesion region in the blow pipe And, when the predetermined slag removal cannot be achieved in the first stage slag removal process, the second stage slag removal process in which the solids are separately injected from the injection nozzle and the slag removal is carried out.
  • the first stage of the slag removal process by liquid injection which has less risk of pipe wear and breakage compared to solid collision, is performed preferentially.
  • a third stage slag removal process is performed in which slag removal is performed by spraying the solid and the liquid together. It is desirable that Thereby, the reliability of slag removal is further improved.
  • a suitable liquid in this case is a flammable liquid such as heavy oil.
  • slag removing device and the slag removing method of the present invention described above, since the slag is destroyed and removed by liquid injection or solid matter injection, even if pulverized coal without softening point adjustment is used, a simple device configuration Thus, slag removal can be achieved easily and reliably, and the risk of pipe wear and breakage can be reduced by giving priority to liquid jetting.
  • low grade coal with an ash melting point as low as about 1100 to 1300 ° C. such as subbituminous coal and lignite
  • pulverized coal for auxiliary fuel by reforming it as raw coal. That is, oxygen contained in the hot air of about 1200 ° C. into which the auxiliary fuel is blown reacts with pulverized coal, so that the low melting point slag dissolved by the combustion heat generated by this combustion reaction comes into contact with the low temperature tuyere and rapidly cools. Even if it becomes solid slag and adheres to the tuyere, slag adhered by liquid injection or solid matter injection can be easily destroyed and removed to prevent the flow path of the blow pipe from becoming clogged. .
  • FIG. 1 It is a schematic block diagram which shows one Embodiment of the slag removal apparatus and slag removal method which concern on this invention. It is a schematic block diagram which shows the modification of a swirl flow formation part about the slag removal apparatus and slag removal method shown in FIG. It is a principal part enlarged view explaining the structural example of a slag detection means about the slag removal apparatus and slag removal method shown in FIG. It is a figure which shows the structural example of the blast furnace equipment with which the slag removal apparatus and slag removal method shown in FIG. 1 are applied.
  • the slag removal apparatus and the slag removal method of this embodiment are used in blast furnace equipment in which pulverized coal, which is low-grade coal, is blown into the blast furnace together with hot air from the tuyere.
  • a raw material 1 such as iron ore, limestone, and coal is supplied from a raw material fixed supply device 10 to a furnace top hopper 21 provided at the top of a blast furnace body 20 via a carry-in conveyor 11.
  • the lower side wall of the blast furnace main body 20 is provided with a plurality of tuyere 22 arranged at substantially equal pitches in the circumferential direction.
  • Each tuyere 22 is connected to a downstream end of a blow pipe 30 that supplies hot air 2 into the blast furnace body 20.
  • the upstream end of each blow pipe 30 is connected to a hot air supply device 40 that is a supply source of the hot air 2 supplied to the inside of the blast furnace body 20.
  • pretreatment such as evaporation of moisture in the coal from raw coal (low-grade coal such as subbituminous coal and lignite) is performed, and after this pretreatment, low-grade coal is A pulverized coal production apparatus 50 that is pulverized into pulverized coal is installed.
  • the reformed pulverized coal (modified coal) 3 produced by the pulverized coal production apparatus 50 is gas-transported to the cyclone separator 60 by a carrier gas 4 such as nitrogen gas. After the gas transported pulverized coal 3 is separated from the transported gas 4 by the cyclone separator 60, it is dropped into the storage tank 70 and stored.
  • the pulverized coal 3 after such reforming is used as blast furnace blown coal (PCI charcoal) of the blast furnace body 20.
  • the pulverized coal 3 in the storage tank 70 is supplied into the injection lance (hereinafter referred to as “lance”) 31 of the blow pipe 30 described above.
  • the pulverized coal 3 is combusted by being supplied into the hot air flowing through the blow pipe 30 and forms a flame at the tip of the blow pipe 30 to form a raceway.
  • the coal etc. which are contained in the raw material 1 thrown in in the blast furnace main body 20 are burned.
  • the iron ore contained in the raw material 1 is reduced to become pig iron (molten metal) 5 and taken out from the tap outlet 23.
  • a suitable property of the pulverized coal 3 that is supplied from the lance 31 to the inside of the blow pipe 30 and becomes the blast furnace blowing coal that is, a modified pulverized coal (auxiliary fuel) obtained by reforming and pulverizing low-grade coal.
  • the oxygen atom content (dry base) is 10 to 18% by weight
  • the average pore diameter is 10 to 50 nm (nanometers).
  • a more preferable average pore diameter of the modified pulverized coal is 20 to 50 nm (nanometers).
  • Such pulverized coal 3 is largely reduced in the main skeleton (C, H, O) although the tar-generating groups of the oxygen-containing functional groups (carboxyl group, aldehyde group, ester group, hydroxyl group, etc.) are greatly reduced.
  • the decomposition (decrease) of the combustion component is greatly suppressed. For this reason, when the hot air 2 is blown into the blast furnace body 20 from the tuyere 22, the main skeleton contains a large amount of oxygen atoms, and the oxygen in the hot air 2 easily diffuses into the charcoal due to the large-diameter pores.
  • tar content is very difficult to generate, complete combustion can be achieved with almost no unburned carbon (soot).
  • low-grade coal such as sub-bituminous coal or lignite as raw coal (dry base oxygen atom content ratio: 18% by weight)
  • a drying step is carried out by heating (110 to 200 ° C. ⁇ 0.5 to 1 hour) in a low oxygen atmosphere having an oxygen concentration of 5% by volume or less.
  • the raw coal After removing moisture in the above-described drying step, the raw coal is heated again in a low oxygen atmosphere (oxygen concentration: 2% by volume or less) (460 to 590 ° C. (preferably 500 to 550 ° C.)) ⁇ 0.5 to 1
  • a dry distillation step is carried out.
  • the raw coal is carbonized by this carbonization process, so that generated water, carbon dioxide and tar are removed as carbonized gas or carbonized oil.
  • the raw coal that has advanced to the cooling step is cooled (50 ° C. or lower) in a low oxygen atmosphere having an oxygen concentration of 2% by volume or less, and then finely pulverized (particle size: 77 ⁇ m or less (80%) Pass)) and is easily manufactured.
  • the blow pipe 30 is used for the purpose of removing the slag S attached to the inner wall surface of the blow pipe 30, which is a slag adhesion region, the tuyere 22 and the inner wall surface in the vicinity thereof.
  • An injection nozzle 80 is provided for injecting the liquid 6 or the solid material 7 into the inside.
  • the injection nozzles 80 are provided in the circumferential direction along the inner peripheral surface of the blow pipe 30 as appropriate.
  • the suitable liquid 6 ejected from the ejection nozzle 80 include flammable liquids such as water or heavy oil.
  • suitable solid substance 7 injected from the injection nozzle 80 granular coal, slag, a lime grain, a pellet grain, a sintered ore, iron powder, etc. can be illustrated, 1 type or multiple types are mixed from these. Can be used.
  • the liquid 6 ejected from the ejection nozzle 80 rapidly cools the slag adhering to the vicinity of the blow pipe 30 and the tuyere 22 using the latent heat of vaporization.
  • the slag S that has been rapidly cooled by the injection of the liquid 6 is destroyed by the heat shrinkage and can be easily removed.
  • the solid material 7 injected from the injection nozzle 80 travels without melting in the blow pipe 30 by using the flow of the hot air 2 as a driving force, and therefore collides with the slag S adhering to the vicinity of the tuyere 22. To do. Therefore, the solid material 7 can collide with the slag S and give a mechanical impact. As a result, the slag S subjected to the collision of the solid material 7 is easily removed because it is destroyed by the impact at the time of the collision.
  • the injection nozzle 80 is configured so that the outlet opening of the nozzle tip 81 that injects the fluid of the liquid 6 or the solid material 7 is not blocked by the pulverized coal 3 or the slag S. It is desirable that the lance 31 is provided at a position substantially coincident with the tip 31a of the lance 31 or slightly upstream.
  • the nozzle tip 81 of the injection nozzle 80 preferably has a nozzle shape that injects fluid in the direction of the tuyere 22, particularly liquid in a rod shape, and the injection direction may be variable as necessary.
  • the injection direction of the nozzle tip 81 is variable, for example, the nozzle tip 81 is swung or swung using the supply pressure of the liquid or solid carrier gas.
  • the radial position at which the injection nozzle 80 is installed does not become a flow path resistance of the hot air 2 and can be directly irradiated toward the slag S attached to the wall surface of the blow pipe 30. A position close to the wall is desirable.
  • the ejection nozzle 80 is connected to a liquid supply source 83 via a liquid supply pipe 84.
  • the liquid supply pipe 84 includes, as main components, a supply pump 85 for pressure-feeding the liquid in the liquid supply source 83 to the injection nozzle 80, and a liquid supply (ON / OFF) to the injection nozzle 80 by switching operation of the open / close state. And an open / close control valve 86 for controlling (OFF).
  • the injection nozzle 80 is connected via a solid supply source 87 and a solid supply pipe 88.
  • the solid material of the solid material supply source 87 includes a solid material transport gas supply source (not shown) such as nitrogen gas.
  • the solid material supply pipe 88 is provided with an open / close control valve 89 that controls supply (on / off) of solid material to the injection nozzle 80 by switching operation of the open / close state as a main component.
  • Open / close control of the open / close control valves 86 and 89 is performed based on the value of the differential pressure ⁇ P measured by the differential pressure gauge 90.
  • two pressure introduction pipes 90a and 90b are connected to the differential pressure gauge 90 so as to measure a differential pressure ⁇ P between the hot air mother pipe 32 and the blow pipe downstream position near the tuyere 22 of the blow pipe 30. ing.
  • the ejection nozzle 80 supplies the liquid 6 to be ejected and includes a liquid supply system including the opening / closing control valve 86, and a solid material supply system including the solid material 7 to be ejected and including the opening / closing control valve 89.
  • a differential pressure gauge (slag detecting means) 90 for detecting a slag state in the slag adhesion region. Therefore, the illustrated injection nozzle 80 selects either the liquid 6 or the solid material 7 from one nozzle tip 81 according to the open / close state of the open / close control valves 86 and 89, or the liquid 6 and the solid material. 7 can be injected simultaneously.
  • liquid supply system and a solid material supply system are connected to one injection nozzle 80
  • the present invention is not limited to this configuration. That is, the liquid supply system and the solid material supply system may be configured to include independent liquid injection nozzles or solid material injection nozzles.
  • the determination of the amount of slag adhesion is made based on the differential pressure between the hot air pressure upstream of the injection nozzle 80 and the hot air pressure near the outlet of the blow pipe 30. That is, if slag S adheres to the inner wall surface of the blow pipe 30 or near the tuyere 22, pressure loss occurs due to a reduction in the cross-sectional area of the flow path of the blow pipe 30, so that the blast furnace body is supplied from the hot air mother pipe 32. A pressure drop will occur in the flow of hot air flowing out to 20.
  • the differential pressure gauge 90 determines whether the hot air 2 generated before and after the slag adhesion region by the differential pressure gauge 90.
  • the pressure ⁇ P is measured, and the adhesion state of the slag S is estimated from the magnitude of the differential pressure ⁇ P.
  • the differential pressure ⁇ P thus measured is used for the opening / closing operation of the opening / closing control valves 86 and 89 described above by comparison with a predetermined threshold value.
  • the injection nozzle 80 described above may perform slag removal by spraying the liquid 6 or the solid material 7 alone, or may perform slag removal by simultaneously spraying both the liquid 6 and the solid material 7. Also good.
  • the liquid is independently injected from the injection nozzle 80 to perform the slag removal, and the predetermined slag removal is achieved in the first stage slag removal process.
  • the solid material 7 is jetted independently from the jet nozzle 80 as a second stage slag removing step.
  • a third slag removal is performed by simultaneously injecting the liquid 6 and the solid material 7 from the injection nozzle 80 so that the predetermined slag removal cannot be achieved in the second-stage slag removal process.
  • a step of removing slag may be provided.
  • the slag removal that injects the liquid 6 has an advantage that the risk of pipe wear or breakage is small as compared with the slag removal that causes the solid 7 to collide. Accordingly, the first stage of slag removal process by liquid jet is preferentially executed, and only when the slag S cannot be removed by this liquid jet, for example, the slag removal is completed even if the liquid is jetted continuously for a predetermined time. The second stage slag removal step is performed only when it is not possible to confirm that this has been done. As a result, even the slag S that could not be removed by the liquid 6 can be reliably removed using the impact force of the solid material 7.
  • a more preferable slag removal method cannot achieve predetermined slag removal even in the slag removal process in which the solid substance 7 is independently injected from the injection nozzle 80 as the second stage slag removal process and the solid substance 7 is separately injected in the second stage.
  • the slag removal is performed by simultaneously jetting the liquid 6 and the solid material 7 from the jet nozzle 80.
  • the liquid 6 and the solid material 7 can be simultaneously injected.
  • the opening / closing control of the opening / closing control valves 86 and 89 based on the threshold value of the differential pressure ⁇ P and the differential pressure ⁇ P measured by the differential pressure gauge 90 will be specifically described.
  • the operation of the delivery pump 85 is started so that the liquid is ejected from the ejection nozzle 80 when the open / close control valve 86 is opened. Is done.
  • two threshold values that is, a first threshold value (slag removal threshold value) HL for opening the open / close control valves 86 and 89 in the closed state, and a second threshold value (closing the open / close control valves 86 and 89 in the open state).
  • Slag removal stop threshold) LL As for the two threshold values, the same value may be adopted in the slag removing process such as the first stage and the second stage described above, or the first stage slag removing process by, for example, liquid injection is preferentially performed. In some cases, for example, a larger value may be employed in the subsequent stage slag removal process than in the first stage slag removal process.
  • the first threshold value (slag removal threshold value) HL opens the open / close control valves 86 and 89 when the slag adhesion amount detected by the differential pressure gauge 90 of the slag detection means is greater than or equal to the slag removal threshold value, and opens the liquid 6 And a threshold value for injecting the solid material 7.
  • the second threshold value (slag removal stop threshold value) LL closes the open / close control valves 86 and 89 when the slag adhesion amount detected by the differential pressure gauge 90 of the slag detection means is smaller than the slag removal stop threshold value. 6 and a threshold value for stopping the injection of the solid material 7.
  • the open / close control valves 86 and 89 are set in a closed state, and the differential pressure ⁇ P detected by the differential pressure gauge 90 is a second threshold value. It is lower than LL and there is almost no differential pressure ( ⁇ P ⁇ 0).
  • the slag S gradually adheres and accumulates on the wall surface at the blow pipe 30 and the tuyere 22, and as a result, the flow path resistance decreases due to the decrease in the cross-sectional area of the flow path. Will gradually increase. Therefore, when the value of the differential pressure ⁇ P detected by the differential pressure gauge 90 increases and reaches the first threshold value HL, the opening signals of the open / close control valves 86 and 89 are output from the differential pressure gauge 90 that has detected this. By this open signal, the opening / closing control valves 86 and 89 are opened, and the delivery pump 85 is also started simultaneously.
  • the liquid 6 stored in the liquid supply source 83 is sprayed from the spray nozzle 80 toward the inside of the blow pipe 30, and at the same time, the solid material 7 stored in the solid material supply source 87 is also It is injected toward the inside of the blow pipe 30 from the injection nozzle 80.
  • the injected solid material 7 flows in the direction of the tuyere 22 along the flow of the hot air 2, and when it hits the attached slag S, an impact force is generated so that the brittle slag S is broken with a glassy solid. To break.
  • the slag S hit by the solid material 7 and received an impact force is broken and removed from the wall surface. That is, the slag S that is broken and becomes a relatively small lump is removed into the furnace of the blast furnace body 20 by the hot air 2 or the flow of liquid.
  • the flow path resistance decreases with an increase in the cross-sectional area of the flow path, so the differential pressure ⁇ P detected by the differential pressure gauge 90 also decreases.
  • a closing signal for the opening / closing control valves 86 and 89 is output. The opening / closing control valves 86 and 89 are closed by this closing signal, and the operation of the delivery pump 92 is also stopped at the same time, so that the injection of the liquid 6 and the solid material 7 is stopped.
  • the first threshold value HL described above is slightly large in order to prevent frequent opening and closing of the opening and closing control valves 86 and 89 by providing a hysteresis with the second threshold value LL that opens the opening and closing control valves 86 and 89.
  • the value (HL> LL) is set.
  • the third threshold HHL may be set.
  • the third threshold value HHL is a set value (HHL> HL) that is larger than the first threshold value HL that opens the open / close control valves 86 and 89 in the closed state, and when a differential pressure ⁇ P exceeding the threshold value HHL is detected. Therefore, it can be determined that there is a problem in removing the slag S.
  • the third threshold value HHL is an alarm output threshold value in which the slag adhesion amount is set to a value larger than the first threshold value (slag removal threshold value) HL described above.
  • a swirl flow is generated in the flow of the hot air 2 between the lance 31 and a position upstream of the lance 31 into which the pulverized coal 3 is blown, that is, between the hot air mother pipe 32 supplying the hot air 2 and the lance 31.
  • a swirl flow forming portion is provided for generating
  • the swirl flow forming unit may employ a swirl vane 33 as shown in FIG. 1, for example, or may employ a swirl ribbon 34 as shown in FIG. 2 as a modification.
  • the swirl vane 33 is formed by arranging a plurality of vanes having an angle with respect to the flow path cross section in the circumferential direction, and the swirl ribbon 34 is a thin plate formed into a spiral shape.
  • the hot air 2 flowing in the blow pipe 30 becomes a swirl flow by passing through the swirl flow forming part.
  • the solid material 7 blown out from the injection nozzle 80 is affected by the swirl flow formed in the blow pipe 30, and gathers to the outer peripheral side by centrifugal force. Accordingly, the solid matter 7 collides with the pipe inner surface of the blow pipe 30 to which the slag S adheres or the inner surface of the tuyere 22 intensively, and efficient slag removal becomes possible.
  • the slag S is destroyed and removed by liquid injection or solid injection, so the pulverized coal 3 that does not adjust the softening point is used. Even in this case, slag removal can be achieved easily and reliably with a simple device configuration. Furthermore, by implementing slag removal giving priority to liquid injection, it is possible to reduce the risk of wear or breakage occurring in the blow pipe 30. Therefore, the attached slag S can be destroyed and removed without adjusting the softening point of the pulverized coal 3, so that the maintenance period of the blow pipe 30 can be extended to the wear life of the tuyere 22, for example. It becomes.
  • the component contained in the slag S of the pulverized coal 3 and melted by the hot air 2 or the combustion heat of the pulverized coal 3, that is, the low melting point slag component generally has an ash melting point when the hot air 2 of about 1200 ° C. is used. It is about 1100-1300 ° C.
  • Such a low-melting-point slag component is also included in reformed coal that has been subjected to reforming treatment such as drying or dry distillation using low-grade coal such as subbituminous coal or lignite as the raw coal of pulverized coal 3.
  • reforming treatment such as drying or dry distillation using low-grade coal such as subbituminous coal or lignite as the raw coal of pulverized coal 3.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacture Of Iron (AREA)
  • Blast Furnaces (AREA)
  • Furnace Charging Or Discharging (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
  • Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
PCT/JP2013/074414 2012-09-20 2013-09-10 スラグ除去装置及びスラグ除去方法 WO2014045949A1 (ja)

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CN201380048341.XA CN104641003B (zh) 2012-09-20 2013-09-10 炉渣除去装置
DE112013004601.6T DE112013004601T5 (de) 2012-09-20 2013-09-10 Schlackeentfernungsvorrichtung und Schlackeentfernungsverfahren
IN2076DEN2015 IN2015DN02076A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2012-09-20 2013-09-10
KR20157006733A KR20150044933A (ko) 2012-09-20 2013-09-10 슬래그 제거장치 및 슬래그 제거방법
US14/428,907 US20150240322A1 (en) 2012-09-20 2013-09-10 Slag removal device and slag removal method

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JP6016549B2 (ja) * 2012-09-20 2016-10-26 三菱重工業株式会社 スラグ除去装置
CN107655321B (zh) * 2017-11-08 2023-12-01 辽宁科技大学 一种强电磁力推动弹体清除回转窑出口结渣的装置及方法
JP7130898B2 (ja) * 2019-03-28 2022-09-06 株式会社神戸製鋼所 高炉の操業方法
CN111455128B (zh) * 2020-04-22 2021-12-21 山东钢铁股份有限公司 一种炉下积渣降温装置及工作方法
CN113739594A (zh) * 2021-09-22 2021-12-03 新疆宜化化工有限公司 一种防止电石炉内物料板结的自动破除工艺及装置
CN116287674B (zh) * 2022-12-05 2025-09-02 扬州恒润海洋重工有限公司 一种可提高烟煤喷吹比例的方法

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JPS62161905A (ja) * 1986-01-10 1987-07-17 Kobe Steel Ltd 高炉送風羽口の堆積物除去装置
JPS6428312A (en) * 1987-07-24 1989-01-30 Nippon Steel Corp Blowing method for powdered material into blast furnace
JPH06192714A (ja) * 1992-12-24 1994-07-12 Sumitomo Metal Ind Ltd 高炉羽口内面の灰分除去方法
JPH08100208A (ja) * 1994-10-03 1996-04-16 Nkk Corp 高炉微粉炭吹込み用羽口部構造
JPH1150113A (ja) * 1997-08-02 1999-02-23 Nippon Steel Corp 微粉炭の高炉内吹き込み方法
JP2001342508A (ja) * 2000-06-05 2001-12-14 Nkk Corp 高炉送風羽口の開孔装置およびその方法

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JP6016549B2 (ja) * 2012-09-20 2016-10-26 三菱重工業株式会社 スラグ除去装置
JP6012359B2 (ja) * 2012-09-20 2016-10-25 三菱重工業株式会社 ブローパイプ構造

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JPS62161905A (ja) * 1986-01-10 1987-07-17 Kobe Steel Ltd 高炉送風羽口の堆積物除去装置
JPS6428312A (en) * 1987-07-24 1989-01-30 Nippon Steel Corp Blowing method for powdered material into blast furnace
JPH06192714A (ja) * 1992-12-24 1994-07-12 Sumitomo Metal Ind Ltd 高炉羽口内面の灰分除去方法
JPH08100208A (ja) * 1994-10-03 1996-04-16 Nkk Corp 高炉微粉炭吹込み用羽口部構造
JPH1150113A (ja) * 1997-08-02 1999-02-23 Nippon Steel Corp 微粉炭の高炉内吹き込み方法
JP2001342508A (ja) * 2000-06-05 2001-12-14 Nkk Corp 高炉送風羽口の開孔装置およびその方法

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KR20150044933A (ko) 2015-04-27
DE112013004601T5 (de) 2015-06-11
IN2015DN02076A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 2015-08-14
CN104641003B (zh) 2017-04-26
CN104641003A (zh) 2015-05-20
JP2014062293A (ja) 2014-04-10
US20150240322A1 (en) 2015-08-27

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