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WO2013108512A1 - Dispositif de récupération de gaz de convertisseur et procédé d'actionnement par soufflage de gaz de scellement étanche - Google Patents

Dispositif de récupération de gaz de convertisseur et procédé d'actionnement par soufflage de gaz de scellement étanche Download PDF

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Publication number
WO2013108512A1
WO2013108512A1 PCT/JP2012/081882 JP2012081882W WO2013108512A1 WO 2013108512 A1 WO2013108512 A1 WO 2013108512A1 JP 2012081882 W JP2012081882 W JP 2012081882W WO 2013108512 A1 WO2013108512 A1 WO 2013108512A1
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WO
WIPO (PCT)
Prior art keywords
gas
converter
seal gas
blowing
flow rate
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/JP2012/081882
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English (en)
Japanese (ja)
Inventor
織田　剛
稲葉　岳志
慎哉 杉浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kobe Steel Ltd
Original Assignee
Kobe Steel Ltd
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
Priority claimed from JP2012009319A external-priority patent/JP5869891B2/ja
Priority claimed from JP2012086798A external-priority patent/JP5869945B2/ja
Application filed by Kobe Steel Ltd filed Critical Kobe Steel Ltd
Publication of WO2013108512A1 publication Critical patent/WO2013108512A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
    • C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
    • C21C5/28—Manufacture of steel in the converter
    • C21C5/38—Removal of waste gases or dust
    • C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/25—Process efficiency

Definitions

  • the present invention relates to a converter gas recovery device that recovers a converter gas mainly composed of CO generated in a converter blowing process, and a method of blowing a seal gas supplied to a recovery hood of the converter gas recovery device. is there.
  • CO gas generated in large quantities in the converter blowing process has good combustibility and usually has a latent heat of about 2,000 Kcal / nm 3, so fuel gas for boilers, rolling mills, lime firing furnaces, etc. It is used as.
  • a cover part is provided so as to cover the skirt part from the surroundings, and an air supply pipe and an intake pipe for supplying seal gas to the CO gas are connected to the cover part, and the pressure near the collection hood exceeds the atmospheric pressure.
  • the inside of the cover is adjusted to less than atmospheric pressure, and when the pressure near the collection hood is less than atmospheric pressure, the CO gas is efficiently recovered while adjusting the pressure inside the cover to exceed atmospheric pressure.
  • a gas recovery method has also been proposed (see, for example, Patent Document 2).
  • JP 59-222514 A JP-A-63-317612 JP-A-56-127721
  • the seal gas required for actual blowing requires a volume flow of about 0.25 times the volume flow of the CO gas generated from the converter, the diameter of the seal gas supply pipe for that purpose is required. Therefore, the size of about 1/2 of the furnace diameter is required.
  • the vicinity of the furnace opening is also called spitting, where the liquid melt from the converter frequently scatters and falls, and the recovery hood closes as the scattered liquid melt adheres closer to the furnace throat. It becomes easy to do.
  • sealing when sealing is performed using sealing gas, in order to prevent N 2 in the outside air from being mixed into the recovered converter gas, sealing must be performed by introducing an excessive sealing gas.
  • sealing is performed with a large amount of sealing gas over a long period of time, for example, CO 2 has a higher specific gravity than air, so that the sealing gas is trapped on the work floor and ventilation is indispensable.
  • the present invention has been made in consideration of the problems in the conventional converter gas recovery apparatus as described above, and the first object is to provide a large amount of air in the open part between the converter furnace port and the recovery hood.
  • An object of the present invention is to provide a converter gas recovery apparatus that can introduce an inert gas and can reliably replace the above-described open-at-air portion with an inert gas atmosphere.
  • the second object of the present invention is to prevent a decrease in oxygen concentration in the working environment even when an excessive inert gas is blown as a seal gas or when a situation occurs in which the seal gas is not sucked into the recovery hood.
  • An object of the present invention is to provide a sealing gas blowing operation method capable of performing the above.
  • the present invention has a first mode related to the converter gas recovery device and a second mode related to the seal gas injection operation method.
  • the first aspect of the present invention is a converter gas recovery apparatus that recovers the converter gas generated in the converter blowing process through a recovery hood.
  • An inert gas is mainly supplied to the converter space between the dust collection duct arranged on the front side of the furnace when viewed from the plane and the center of the converter furnace port, toward the air flow from the front side of the furnace to the converter furnace port.
  • It is a converter gas recovery device provided with a blowing portion of a sealing gas as a component.
  • the sealing gas is blown from the blowing portion along the tilt axis of the converter as viewed from above, and the blowing target of the sealing gas is closer to the furnace front side than the converter furnace port. Preferably it is directed.
  • blowing port of the blowing section can be opened on the left and right wall surfaces that house the converter.
  • blowing port of the blowing section can be opened from the left and right wall surfaces accommodating the converter to the tip of a duct extending along the tilt axis of the converter.
  • the seal gas injection operation method of sealing the gap between the converter furnace port and the recovery hood with a seal gas Detect the change in the seal gas flow during converter gas recovery, or obtain the dust collection duct suction flow rate relative to the seal gas supply flow rate, When the flow of the seal gas changes or when the dust collection duct suction flow rate with respect to the seal gas supply flow rate falls below a predetermined value, the supply amount of the seal gas is reduced or the supply of the seal gas is stopped. This is a seal gas blowing operation method.
  • the change in the flow of the seal gas means, for example, a case where the flow direction of the seal gas flows backward from the inside to the outside with the heat insulating plate of the converter as a boundary.
  • the change in the flow of the seal gas can be detected by attaching a wind direction sensor to the internal observation window of the heat insulating plate installed on the furnace front side of the converter.
  • the change in the flow of the sealing gas can also be detected by attaching a wind direction sensor to the back side gap of the heat insulating plate installed on the front side of the converter.
  • the dust collection duct suction flow rate is obtained by converting the internal pressure of the dust collection duct into a flow rate, and when the ratio of the dust collection duct suction flow rate to the seal gas supply flow rate falls below a threshold value, the seal gas
  • the supply amount of the seal gas can be stopped by decreasing the amount of the seal gas supplied until the threshold value or more can be maintained, or by closing the shut-off valve of the seal gas supply path.
  • a timer is started when a seal gas supply start command is issued, and the seal gas supply path shut-off valve is turned off when the next seal gas supply start command is not given until the predetermined time has elapsed. It can be closed and the supply of the sealing gas can be stopped.
  • the seal gas is nitrogen gas that is by-produced when oxygen used for blowing the converter is separated from air or nitrogen that contains impurities such as oxygen slightly. Gas can be used.
  • the converter gas recovery device of the present invention a large amount of seal gas is introduced into the converter space using a large pipe, and the air-released portion between the converter furnace port and the converter gas recovery device is reliably undisturbed. It has the advantage that it can be replaced with an active gas atmosphere.
  • the sealing gas blowing operation method when excessive inert gas is blown as the sealing gas, or when a situation occurs in which the sealing gas is not sucked into the recovery hood, the sealing gas is blown. It has the advantage that it can be controlled safely and reliably.
  • (a) is an air flow diagram in the converter and converter gas recovery device according to the present invention
  • (b) is an air flow diagram in a state in which the heat insulating plate and the dust collecting duct are removed.
  • It is explanatory drawing which shows the structure of the blow-down type blowing duct in a converter gas recovery apparatus. It is the graph which showed the substitution efficiency by the blowing duct of an opposing blowing system. It is the side view which showed the example of arrangement
  • (a) is a gas flow diagram when an extended blowing duct is applied
  • (b) is an analysis image of a flow velocity contour and a flow vector in a horizontal plane
  • (c) is an analysis image of an inert gas concentration distribution.
  • (a) is a gas flow diagram in the case of applying a flush blow duct
  • (b) is an analysis image of a flow velocity contour and a flow vector in a horizontal plane
  • (c) is an analysis image of an inert gas concentration distribution.
  • (a) is a gas flow diagram when the left window is open and a plane blow-in duct is applied
  • (b) is an analysis image of the flow velocity contour and the flow vector in the horizontal plane
  • (c) is an analysis image of the inert gas concentration distribution. is there.
  • the converter equipment to which the present invention is applied includes a converter configured to be tiltable, ancillary equipment provided around the converter, for example, an oxygen gas blowing lance, a measuring sub lance, a converter tilting device, and a converter A recovery hood for recovering gas is provided, and these converter facilities are installed in a building not shown.
  • Opening and closing door-type heat shields are installed on the front side of the furnace in the building, and dust collection ducts are installed in the building on the left and right sides of the converter, on the left and right sides of the furnace, and around the recovery hood. ing.
  • a model of the main converter and converter gas recovery device is manufactured on a 1/20 scale, and numerical analysis and investigation are conducted to investigate the state of air flow in the converter space.
  • a model experiment was conducted. As a result, it was discovered that there was an air flow from the front of the furnace toward the furnace port of the converter.
  • the converter gas recovery device of the present invention a place away from the gap portion (atmosphere release portion) between the furnace port and the recovery hood in the converter gas recovery device, specifically, the furnace front side (hot metal equipment) Release the sealing gas consisting of inert gas toward the wide space on the inlet side and place the sealing gas on the flow of air from the front side of the furnace to the furnace port as described above to create an inert gas atmosphere. It is possible to replace with. Thereby, it is also possible to blow seal gas from a position where there is little spitting damage.
  • Converter gas recovery device [1.1] Seal gas Seal gas, which has a volumetric flow rate about 0.25 times the volumetric flow rate of the converter gas, separates oxygen used for converter blowing from air. Use low-purity waste nitrogen gas produced as a by-product.
  • a cryogenic air separation device is used to produce oxygen, but the generated pure nitrogen is used in large quantities at each factory in the steelworks, so there is almost no surplus. However, about 3% of oxygen and waste nitrogen gas containing moisture up to the saturation state are released into the atmosphere without being used.
  • the volume of about 230% is seen in the state of 1,300 to 1,500 ° C. from the above air separation ratio. If a normal temperature sealing gas having a volume 0.25 times larger than that is required, about 58% of the sealing gas is required.
  • waste nitrogen is produced as a by-product at a ratio of 59%. Therefore, when this waste nitrogen is used as a seal gas, it is possible to recover the converter gas at substantially no production cost. Become.
  • Air flow As described above, there is a flow of air (outside air) from the front side of the furnace toward the furnace port.
  • Fig.1 (a) shows the air flow diagram analyzed about the converter and the converter gas recovery device using the 1/20 scale converter equipment model
  • Fig.1 (b) shows the heat insulation plate from Fig.1 (a). The air flow figure in the state which removed the dust collection duct is shown.
  • the furnace port 1a of the converter 1 and the recovery hood 2 of the converter gas recovery device face each other, and a skirt portion 3 is provided around the recovery hood 2.
  • the said skirt part 3 is comprised by the four hydraulic cylinders 3a arrange
  • a heat insulating plate 4 is disposed on the furnace front side of the converter 1, and the heat insulating plate 4 is provided with two windows 4a for monitoring the blowing state.
  • reference numerals 5 and 5 denote dust collection ducts disposed on the furnace back side and the furnace right side.
  • the sealing gas can be efficiently blown if the sealing gas (in this embodiment, waste nitrogen gas) is put on the air flow F 1 that is drawn from the furnace front side and flows into the recovery hood 2.
  • a furnace duct 1a is provided by providing a blow duct 6 having a shape cut obliquely toward the front edge of the furnace opening, and blowing down the sealing gas at a low flow rate of about 4 m / s from the blow opening 6a.
  • seal gas waste nitrogen gas
  • the blowing direction of the seal gas is not directed to the center of the furnace port, but the center of the furnace port 1a like the front edge of the furnace port. It must be directed to the front side of the furnace.
  • such an arrangement of the blowing duct 6 can obtain the highest replacement efficiency, but receives the radiant heat from the charged hot metal when the converter 1 is tilted forward and the hot metal is charged. There is a problem of being exposed to high temperatures. Therefore, for practical use, it is necessary to take heat measures such as making the blow duct 6 into a heat resistant structure.
  • the blowing duct 6 functions as a sealing gas blowing section mainly composed of an inert gas.
  • the B type in which the inlet is arranged on the building wall surface between the dust collection duct in front of the furnace and the center of the furnace mouth has an inert gas (nitrogen) flow rate / involvement flow rate ratio.
  • the highest replacement efficiency is achieved with a small seal gas flow rate.
  • the A type has a seal gas blowing port arranged directly under the furnace pre-dust collection duct
  • the B type has a blow port arranged on the furnace front side between the pre-furnace dust collection duct and the furnace port center.
  • the type C and the type C are those in which the inlet is arranged at the center of the furnace port, and the type D is the one on the back side of the furnace and the inlet is arranged rearward from the center of the furnace port.
  • all the heights of the blowing inlet are set to the vicinity of the furnace opening height.
  • the B type alone can still achieve high replacement efficiency with a small seal gas flow rate.
  • (a) is a flow diagram of the gas (air / seal gas) to the recovery hood
  • (b) is an analysis image of the flow velocity contour and the flow velocity vector in the horizontal plane
  • (c) is the inert gas concentration distribution. It is an analysis image.
  • FIG. 6 shows that two windows (see windows 4a and 4a in FIG. 1) are opened and extended blowing ducts 7 and 8 (the blowing duct is extended from the building wall surface into the converter space so that the blowing ports 7a and 8a protrude 2 m.
  • the analysis results when using the above are shown.
  • Fig. 7 shows the analysis results when using a flush inlet duct with the two windows open (the inlet of the duct is flush with the wall of the building).
  • Fig. 8 shows the analysis results when only the left window is open and the flush blow duct is used.
  • the extended blowing ducts 7 and 8 and the flush blowing duct function as a sealing gas blowing portion mainly containing an inert gas.
  • the seal gas rides on the air flow from the front side of the furnace toward the furnace port and is sucked into the recovery hood 2.
  • the target for blowing out the seal gas from the extension blow ducts 7 and 8 and the flush blow duct is not aimed at the furnace opening, but from the furnace opening in anticipation of getting on the air flow from the furnace front side to the furnace opening. Also aimed at the front of the furnace.
  • each duct is provided along the tilting axis of the converter as viewed from the plane, and a pair is arranged in a state of being symmetrically opposed with the converter 1 as the center when viewed from the front.
  • the extended blowing ducts 7 and 8 can be blown without penetrating the building wall surface by arranging, for example, a crank-shaped duct in the converter space even if the building wall surface cannot be opposed to each other.
  • the ports 7a and 8a can be made to face each other, and a replacement effect equivalent to that of the flush outlet duct can be obtained.
  • the injected seal gas was sucked from the dust collecting duct in front of the furnace and did not flow toward the furnace port.
  • the position of the injection port is closest to the furnace port, and the furnace port is on the extended line in the direction of blowing out the seal gas.
  • the blown seal gas was flowed to the back of the furnace, resulting in removal of the furnace port.
  • Fig. 9 is a graph showing the relationship between the flow rate of the seal gas and the replacement efficiency in the extended blowing duct (extending the 2m duct from the wall surface) and the flush blowing duct (no duct outlet), and the horizontal axis below the graph is inactive.
  • the gas flow rate / involved flow rate ratio is shown, the horizontal axis on the graph shows the flow rate of blown inert gas (m 3 / min), and the vertical axis shows the replacement efficiency (%).
  • suction is performed by blowing a seal gas (waste nitrogen gas) at a flow rate 1.3 to 1.7 times the outside air (intake flow rate) sucked into the converter gas recovery device.
  • a seal gas waste nitrogen gas
  • the outside air normally air containing oxygen
  • 95% of the outside air can be replaced with an inert gas.
  • a large amount of seal gas can be obtained just by providing a blower for supplying an inert gas at a low pressure from the oxygen factory to the converter factory in the same manner as supplying oxygen for converter blowing. Can be led to a wide converter space via a large pipe, and the air release portion between the furnace port and the recovery hood can be effectively replaced with an inert gas atmosphere from a position away from the furnace port.
  • a seal gas (inert gas) is blown into the atmosphere opening portion between the furnace port 1 a and the recovery hood 2.
  • a tuft (blown flow for visualizing the flow direction) was attached to the gap portion of the shielding wall surrounding the converter, and the gas flow passing through the gap portion was observed.
  • FIG. 11 shows the left and right windows (see a and b in the figure) provided on the furnace front open / close door heat shield as the first measurement position.
  • FIG. 12 shows the back of the heat insulating plate (see c in the figure) and the left and right side wall inspection windows (see e in the figure) as the second measurement position.
  • FIG. 13 shows, as the third measurement position, a gap between the furnace front floor and the converter body (see d in the figure) and a gap between the furnace side floor and the converter body (see g in the figure).
  • FIG. 14 shows a furnace door window (see f in the figure) provided on the shield wall on the furnace side as the fourth measurement position.
  • Table 1 shows the test results expressed as the ratio of the dust collection flow rate to the inert gas flow rate.
  • a and b are both windows of the heat insulating plate
  • a is a case where the windows of both of the heat insulating plates are open
  • b is a case where the window of the heat insulating plate on one side is open.
  • the ratio of the minimum pre-furnace dust collection flow rate / inert gas flow rate when the tuft shows a reverse flow the ratio of the minimum pre-furnace dust collection flow rate / inert gas flow rate at the window of the heat insulating plate is 4 .B is 4.06 in the same manner as in b.
  • the ratio of the minimum pre-reactor dust collection flow rate / inert gas flow rate shown in Table 1 indicates that blowout tends to occur in order from the top of Table 1.
  • the inert gas flow rate (seal gas supply flow rate) when the wind direction changes from the converter side toward the working space outside the converter
  • the inert gas flow rate at that time is obtained. Since the ratio of the dust collection flow rate (dust collection duct suction flow rate) is almost constant regardless of the absolute value of the inert gas flow rate and the dust collection flow rate, the collection rate of a certain ratio (ratio) with respect to the inert gas flow rate is used. Ensuring the dust flow rate is the essence of safety measures.
  • 15 to 17 are graphs obtained by measuring the relationship between the ratio of the pre-furnace dust collection flow rate to the inert gas flow rate and the average oxygen concentration at the measurement position.
  • the horizontal axis represents the ratio of the pre-furnace dust collection flow rate / inert gas flow rate
  • the vertical axis represents the average oxygen concentration (%).
  • the graph of FIG. 15 is about the left and right window portions of the heat insulating plate
  • the graph of FIG. 16 is the gap portion between the right side of the heat insulating plate and the left heat insulating plate
  • the graph of FIG. 17 is the back side of the left heat insulating plate and the right heat insulating plate. The relationship between the flow rate ratio and the oxygen concentration is shown for each gap.
  • FIG. 18 shows a system schematic diagram of the converter equipment to which the seal gas blowing operation method of the present invention is applied.
  • a recovery hood 2 is provided facing the furnace port 1a of the converter 1 in an upright state, and the recovery hood 2 is connected to a dust collector 9 via a duct 2a.
  • oxygen separated from raw material air in the cryogenic air separation device 10 is passed through an oxygen compressor 11 and an oxygen tank 12 provided in order from the upstream side of the oxygen supply path L1. Then, the oxygen lance 13 is supplied.
  • waste nitrogen gas having a low purity, which is by-produced when oxygen is separated from air is taken out for sealing gas, and is upstream of the sealing gas supply path L2.
  • seal gas supplied as seal gas to the blow-in duct 18 through a seal gas compressor 14, a seal gas tank 15, a shut-off valve 16, and a gate valve 17 provided in order.
  • the blowing duct 18 is disposed in the vicinity of the furnace port 1a and the recovery hood 2, and is substituted with an inert gas atmosphere by blowing a seal gas into an air opening portion of the gap.
  • the shutoff valve 16 and the gate valve 17 are controlled to be opened and closed by a control unit 19 that performs a blowing operation, and the gate valve 17 can adjust the supply amount of the seal gas. With this, the sealing gas can be supplied or stopped.
  • Seal gas blowing operation method [2.4.1] First sealing gas blowing operation method Attaching to the window of the furnace front side openable door type heat insulating plate and the back of the furnace front side openable door type heat insulating plate An ultrasonic wind sensor is used as an anemometer.
  • Ultrasonic wind direction wind speed sensor has extremely fast follow-up to wind direction changes compared to weathercock-type anemometers, and because the inertial mass that moves when the wind direction changes in the measuring device is zero, it responds to changes in wind direction with virtually zero time constant There is an advantage that you can.
  • FIG. 19 shows a specific example of the ultrasonic wind direction wind speed sensor 20.
  • an ultrasonic wind direction sensor SE-8371UM manufactured by Senecom Co., Ltd. was used.
  • the specifications are wind speed range: 0 to 75 m / S, resolution: 0.1 m / s, wind direction range: 0 to 360 °.
  • wind direction signal information and the wind speed signal information output from the ultrasonic wind direction wind speed sensor 20 are transmitted to a control system in the cab via a cable (not shown) and processed.
  • FIG. 20 is an explanatory diagram showing the mounting position of the ultrasonic wind direction wind speed sensor 20.
  • the openable door-type heat shield 21 on the front side of the furnace is provided with a left window portion 21a and a right window portion 21b, and above the left window portion 21a and the right window portion 21b (see symbol h), respectively.
  • the ultrasonic wind direction wind speed sensor 20 having the above configuration is installed.
  • the ultrasonic wind direction wind speed sensor 20 is attached to the windows (the left window 21a and the right window 21b) of the furnace front side openable door type heat insulating plate 21 so that the wind direction is from the converter side to the outside of the converter.
  • the control unit 19 uses this as a trigger to notify an alarm and adjust the gate valve 17 (see FIG. 18) in the seal gas supply path L2 to be closed. Then, the supply amount of the seal gas is reduced. Alternatively, the shutoff valve 16 is closed to stop the supply of the seal gas itself. Thereby, the injection of the seal gas can be controlled safely and reliably.
  • the ultrasonic wind direction wind speed sensor 20 was installed in the window part of the furnace front side openable door type heat insulating plate in the above embodiment, as described above, the gap portion behind the furnace front side openable door type heat insulating plate 21 is provided. In addition, since the sign of the blowout can be detected first, the ultrasonic wind direction wind speed sensor 20 can be installed behind the furnace front side openable door type heat shield 21.
  • the flow rate of the dust collection duct can be measured with a flow meter, but in this embodiment, the differential pressure generated between the upstream and downstream of the dust collection duct arranged in the vertical direction is measured as information on the duct internal pressure that can be converted into the flow rate. The measured value is converted into a flow rate.
  • the pressure difference ⁇ P between the upstream and downstream ducts is: A: duct cross-sectional area, D: duct equivalent diameter, L: duct length, ⁇ : dust collection air density, U: dust collection air duct average flow velocity, Q: dust collection air
  • A duct cross-sectional area
  • D duct equivalent diameter
  • L duct length
  • ⁇ dust collection air density
  • U dust collection air duct average flow velocity
  • Q dust collection air
  • ⁇ is a proportionality constant (friction loss coefficient) determined by the roughness of the duct surface.
  • the pressure loss mechanism is not only friction but also pressure loss due to vortex generation due to duct cross section change.
  • the proportionality constant ⁇ indicates the effect of combining both pressure loss due to friction and vortex generation. Take it as a proportionality constant.
  • the flow rate ratio of the dust collection duct flow rate to the inert gas flow rate is obtained.
  • the control unit 19 notifies a warning and adjusts the seal valve in a direction to close the gate valve 17 until the threshold value can be maintained. Reduce the supply amount.
  • the shutoff valve 16 of the seal gas supply path L2 is closed to stop the supply of the seal gas. Thereby, the injection of the seal gas can be controlled safely and reliably.
  • the threshold value is determined to be “4.1” based on the graph showing the relationship between the dust collection flow rate and the oxygen concentration in the work environment shown in FIG. 15, FIG. 16, and FIG.
  • the third seal gas injection operation method is an operation method that takes into account a failure of the measuring instrument.
  • the signal information from the ultrasonic wind direction sensor 20 and the signal information from the dust collection duct flowmeter drop off from the normal measurement position with normal values due to a failure of the measuring instrument. It is assumed that it will fall into the abnormal measurement state.
  • an operator who performs operations such as starting / stopping the blowing process in the converter and adjusting the oxygen flow rate always gives instructions to start and continue the injection of seal gas at regular intervals.
  • the operation is performed so that the blowing operation worker of the converter continues the sealing gas blowing operation by pressing the sealing gas blowing button every 15 seconds, for example, unless there is an abnormality.
  • the program is organized.
  • control unit 19 that performs the blowing operation when the start of supply of the seal gas is instructed starts the timer, and the next start of supply of the seal gas is not given until the predetermined time has been counted. In this case, control is performed so that the shutoff valve 16 of the seal gas supply path L2 is closed and the supply of the seal gas is stopped.
  • a typical value of the amount of seal gas blown in 15 seconds is 400 m 3 .
  • This amount furnace front openable door type heat insulating board, the side wall of the converter horizontally, Rourakabe, 40 of the ceiling wall and the converter shield surrounded by the floor space volume 600 meters 3 - 1,000 m 3 near collection hood ⁇ 67 %. That is, it corresponds to a flow rate that can prevent leakage to the outside by filling only the inside of the converter shielding space with the sealing gas.
  • the seal gas blowing operation method has been individually described.
  • an operation method in which the seal gas blowing operation methods are combined may be employed.
  • the ratio of the dust collection duct flow rate to the inert gas flow rate in the dust collection duct is obtained, and the gate valve 17 is kept until the obtained flow rate ratio can maintain the threshold value or more.
  • the shut-off valve 16 may be controlled to close when the valve is adjusted in the closing direction and the threshold value or more cannot be maintained, or the seal gas blowing button is not pressed for more than 15 seconds even when the flow rate ratio is normal. it can.
  • the seal gas blowing operation in the seal gas blowing operation converter gas recovery can be performed most safely.
  • the present invention can be used for a converter gas recovery facility for recovering a converter gas generated in a converter blowing process.

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  • Chemical & Material Sciences (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacturing & Machinery (AREA)
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  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Carbon Steel Or Casting Steel Manufacturing (AREA)
  • Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
PCT/JP2012/081882 2012-01-19 2012-12-10 Dispositif de récupération de gaz de convertisseur et procédé d'actionnement par soufflage de gaz de scellement étanche Ceased WO2013108512A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP2012-009319 2012-01-19
JP2012009319A JP5869891B2 (ja) 2012-01-19 2012-01-19 転炉ガス回収装置
JP2012086798A JP5869945B2 (ja) 2012-04-05 2012-04-05 シールガス吹込運転方法
JP2012-086798 2012-04-05

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WO2013108512A1 true WO2013108512A1 (fr) 2013-07-25

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116287537A (zh) * 2022-11-28 2023-06-23 山东钢铁股份有限公司 一种转炉氧枪孔密封装置及方法

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US3215523A (en) * 1963-05-27 1965-11-02 Chemical Construction Corp Recovery of off-gas from a steel converter
JPS4844114A (fr) * 1971-10-04 1973-06-25
JP2001107126A (ja) * 1999-10-13 2001-04-17 Nippon Steel Corp 転炉排ガス処理設備におけるダクト構造
JP2007302932A (ja) * 2006-05-10 2007-11-22 Jp Steel Plantech Co 転炉排ガス処理設備におけるスカートのシール構造

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Publication number Priority date Publication date Assignee Title
US3215523A (en) * 1963-05-27 1965-11-02 Chemical Construction Corp Recovery of off-gas from a steel converter
JPS4844114A (fr) * 1971-10-04 1973-06-25
JP2001107126A (ja) * 1999-10-13 2001-04-17 Nippon Steel Corp 転炉排ガス処理設備におけるダクト構造
JP2007302932A (ja) * 2006-05-10 2007-11-22 Jp Steel Plantech Co 転炉排ガス処理設備におけるスカートのシール構造

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN116287537A (zh) * 2022-11-28 2023-06-23 山东钢铁股份有限公司 一种转炉氧枪孔密封装置及方法

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