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EP3330387B1 - Appareil pour souffler de la poussière de charbon d'un four de fusion - Google Patents

Appareil pour souffler de la poussière de charbon d'un four de fusion Download PDF

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Publication number
EP3330387B1
EP3330387B1 EP16830798.1A EP16830798A EP3330387B1 EP 3330387 B1 EP3330387 B1 EP 3330387B1 EP 16830798 A EP16830798 A EP 16830798A EP 3330387 B1 EP3330387 B1 EP 3330387B1
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EP
European Patent Office
Prior art keywords
pulverized coal
burner
injecting
melting furnace
dust
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.)
Active
Application number
EP16830798.1A
Other languages
German (de)
English (en)
Other versions
EP3330387A4 (fr
EP3330387A1 (fr
Inventor
Chang Hyung Lee
Byung Hwan Jung
Tae Hoon Kim
Il Hyun Cho
Geum Sik Heor
Eung Soo Choi
Jin Chan Bae
Tae In Kang
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.)
Posco Holdings Inc
Original Assignee
Posco Co Ltd
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Publication date
Priority claimed from KR1020150106152A external-priority patent/KR101739861B1/ko
Application filed by Posco Co Ltd filed Critical Posco Co Ltd
Publication of EP3330387A1 publication Critical patent/EP3330387A1/fr
Publication of EP3330387A4 publication Critical patent/EP3330387A4/fr
Application granted granted Critical
Publication of EP3330387B1 publication Critical patent/EP3330387B1/fr
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Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0006—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state
    • C21B13/0013—Making spongy iron or liquid steel, by direct processes obtaining iron or steel in a molten state introduction of iron oxide into a bath of molten iron containing a carbon reductant
    • C21B13/002—Reduction of iron ores by passing through a heated column of carbon
    • 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
    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21B—MANUFACTURE OF IRON OR STEEL
    • C21B13/00—Making spongy iron or liquid steel, by direct processes
    • C21B13/0066—Preliminary conditioning of the solid carbonaceous reductant
    • 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
    • F27D17/00—Arrangements for using waste heat; Arrangements for using, or disposing of, waste gases
    • 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
    • C21B5/00—Making pig-iron in the blast furnace
    • C21B5/006—Automatically controlling the process

Definitions

  • the present disclosure relates to a pulverized coal injecting apparatus which injects pulverized coal into an upper portion of a bed of a melting furnace and an injecting method thereof.
  • a dust burner is equipment which collects iron ore dust and coal dust generated in the melting furnace using a hot cyclone and combusts the iron ore dust and coal dust to be reinjected into the upper portion of the bed in the melting furnace.
  • the dust generated in the melting furnace flows into the hot cyclone which is dust removal equipment and then is separated by a principle of the cyclone to flow in a lower pipe.
  • the dust is transferred into the furnace by injection nitrogen in the dust burner and then meets oxygen injected from the front end of the dust burner to be combusted and reinjected into the furnace.
  • an amount of carbon monoxide (CO) gas which is reduced gas is increased due to carbon combustion phenomenon at the end portion of the dust burner and combustion heat which is generated during the combustion reaction raises a temperature of a dome of the melting furnace.
  • a dust burner which decomposes and combusts dust and dry distillation gas generated in the melting furnace is installed in the dome of the melting furnace.
  • the dust burner is located too close to the bed, there is a risk that the flame of the dust burner hits an upper surface of the bed to be in contact therewith so that too much dust is generated and the dust burner is damaged.
  • the dust burner is located too far away from the bed, there is a problem in that most of calorie generated in the dust burner is not used to raise a temperature of the bed, but is used to raise a temperature of the dome so that the temperature of the dome is unnecessarily raised and an operating efficiency of the melting furnace is deteriorated.
  • Patent documents WO2015/000604 , KR20030030495 , US2015/184939 , CN101498554 and JPH0995724 disclose apparatuses for blowing dust coal of melting furnace and blowing method associated within.
  • the present invention has been made in an effort to provide a pulverized coal injecting apparatus of a melting furnace and an injecting method thereof which inject pulverized coal into an upper portion of a bed of a melting furnace to enhance an ore reduction rate while improving an oxidation degree of a reduced gas, thereby simultaneously lowering a portion of carbon dioxide in the melting furnace and increasing a portion of carbon monoxide.
  • the pulverized coal injecting burner which combusts the pulverized coal is installed between the dust burner of the melting furnace and the bed of the melting furnace to provide calorie to the upper portion of the bed of the melting furnace by injecting the pulverized coal and oxygen through the pulverized coal injecting burner.
  • a pulverized coal injecting apparatus of a melting furnace includes: at least one pulverized coal injecting burner which is installed at an upper portion of a bed of a melting furnace; at least one dust burner which is provided below the pulverized coal injecting burner to selectively and additionally inject the pulverized coal into the upper portion of the bed of the melting furnace; and a control unit which controls an injecting amount of pulverized coal supplied to the pulverized coal injecting burner.
  • the pulverized coal injecting burner is connected to pulverized coal producing equipment to be supplied with pulverized coal or is connected to the pulverized coal distributing valve which is installed between the pulverized coal producing equipment and a tuyere installed in the melting furnace to be supplied with the pulverized coal.
  • the dust burner may be connected to the pulverized coal producing equipment or a pulverized coal distributing valve provided between the tuyeres provided in the melting furnace to selectively and additionally inject the pulverized coal to the melting furnace together with the dust.
  • the pulverized coal distributing valve may include a pulverized coal supply pipe equipped with a manual valve and an orifice which adjust an injection amount of pulverized coal.
  • a three-way valve which is remotely and automatically controlled by the control unit may be provided.
  • the three-way valve may have a structure of injecting inert gas to prevent the blockage of the pulverized coal supply pipe at the time of injecting the pulverized coal.
  • the pulverized coal injecting burner may further include an ejector which is provided at a rear end thereof to insert the inert gas into the supplied pulverized coal.
  • the pulverized coal injecting burner may further include a cooling water pipe into which cooling water is injected to prevent thermal damage of a front end of the pulverized coal injecting burner.
  • the cooling water pipe may further include an auxiliary pipe through which the inert gas is injected together with cooling water or independently.
  • the pulverized coal injecting burner may further include an inner pipe which is inserted therein to secure a flow rate of pulverized coal to be injected.
  • the pulverized coal injecting burner may have a structure in which one or more oxygen supply holes are formed therein so that the oxygen is in contact with the pulverized coal which passes through the inner pipe.
  • the inner pipe may be configured such that one or more supports are provided with an interval from an outer side of the inner pipe to be assembled.
  • the ejector may be configured such that a gas supply pipe is connected to a pulverized coal inflow pipe to insert inert gas into the supplied pulverized coal.
  • the cooling water pipe may be configured such that a cooling water inlet pipe and a cooling water outlet pipe connected to the pulverized coal injecting burner are separately provided in a pipe provided in the dust burner.
  • a pulverized coal injecting method of a melting furnace includes: injecting pulverized coal into an upper portion of a bed of a melting furnace using a pulverized coal injecting burner installed in the melting furnace; and controlling an environment of injecting the pulverized coal into the melting furnace.
  • the step of injecting pulverized coal and the step of controlling may further include a pipe installing step of connecting a dust burner using a separate pipe to inject the pulverized coal into the upper portion of the bed of the melting furnace; a pulverized coal injecting burner installing step of installing a pulverized coal injecting burner disposed in the same position as the dust burner above the dust burner; and a pulverized coal injecting step of injecting the pulverized coal into the upper portion of the bed of the melting furnace through the pipe and the pulverized coal injecting burner installed as described above.
  • the pulverized coal injecting burner may be connected to the pulverized coal producing equipment to be supplied with the pulverized coal or connected to a pulverized coal distributing valve which is installed between the pulverized coal producing equipment and a tuyere installed in the melting furnace to be supplied with the pulverized coal.
  • At least one dust burner may be installed below the pulverized coal injecting burner to selectively and additionally inject the pulverized coal into the upper portion of the bed of the melting furnace.
  • the dust burner may be connected to the pulverized coal producing equipment or the pulverized coal distributing valve installed between the tuyeres provided in the melting furnace to selectively and additionally inject the pulverized coal into the melting furnace together with the dust.
  • the cooling water pipe may be installed in the pulverized coal injecting burner and an auxiliary pipe may be connected to the cooling water pipe to prevent the injection of the pulverized coal at the time of leaking the cooling water and inject nitrogen for back-up.
  • the pulverized coal may be injected by any one of processes of directly injecting the pulverized coal into the pulverized coal injecting burner, injecting the pulverized coal into the dust burner by splitting the pipe of the pulverized coal injected into the tuyere installed in the melting furnace, and injecting the pulverized coal by the dust burner through the pulverized coal injecting pipe.
  • a control unit which controls an injection amount of the pulverized coal may be installed to control the entire injection amount of the melting furnace by controlling a rotation speed of a rotating supply device included in the pulverized coal supply equipment to control an injection amount of the pulverized coal which is injected into the upper portion of the bed of the melting furnace.
  • whether the pulverized coal is injected to the dust burner and an injection amount may be calculated based on a changed amount of carbon dioxide in excess gas of the melting furnace to be measured through a flow meter.
  • a pulverized coal injecting apparatus of a melting furnace includes: a reducing furnace which supplies reduced iron; and a melting furnace which is connected to the reducing furnace to be charged with the reduced iron and includes a bed formed of charged reduced iron, coal, and dried and distillated char formed therein and a dome filled with gas above the bed in which the melting furnace includes a dust burner which injects oxygen into the dome to decompose and combust the dust and the dried and distillated gas generated in the melting furnace and a pulverized coal injecting burner which injects the pulverized coal and oxygen into the melting furnace to combust the pulverized coal.
  • the dust burner may be located between the bed and the dome and may be located at a height of 2 m or higher and 3 m or lower from a surface of the bed.
  • a plurality of dust burners may be provided along an internal circumference of the melting furnace.
  • the pulverized coal injecting burner may be located between the dust burner and the bed.
  • the pulverized coal injecting burner may be located along an inner circumference of the melting furnace so as not to overlap the dust burner.
  • the pulverized coal injecting burner may be located at a height of 1.3 m or higher and 1.7 m or lower from the surface of the bed.
  • a ratio of oxygen injected into the dust burner and the pulverized coal injecting burner may be 6:4 to 7:3.
  • the amount of oxygen injected into the dust burner may be adjusted to be reduced and an amount of oxygen injected into the pulverized coal injecting burner may be adjusted to be increased.
  • the amount of oxygen injected into the dust burner may be adjusted to be increased and an amount of oxygen injected into the pulverized coal injecting burner may be adjusted to be reduced.
  • the pulverized coal injecting burner may inject any one fuel of pulverized coal, liquefied natural gas, and coke oven gas to combust the pulverized coal.
  • an ore reduction rate of the fluidizing furnace is easily controlled by controlling the gas oxidation degree and thus rapid repetitive fluctuation of the molten iron temperature due to the lowering of the reduction rate may be reduced.
  • a normal operation of the melting furnace is consistently maintained so that a quality of the molten iron may be stabilized and a molten iron producing cost may be saved.
  • a pulverized coal injecting burner which injects pulverized coal and oxygen to combust the pulverized coal is installed between the dust burner and a surface of the bed to prevent the flame of the dust burner from hitting the upper surface of the bed to be in contact therewith to generate the dust and the dust burner from being damaged.
  • the pulverized coal injecting burner is installed in an appropriate position so that the flame of the pulverized coal injecting burner may supply sufficient calorie to the surface of the bed without being in direct contact with the bed.
  • an amount of oxygen injected to the dust burner at the upper portion is reduced as much as an amount of oxygen which is injected into the pulverized coal injecting burner, so that a supply amount to the dome may be constantly maintained.
  • combustion calorie generated in the pulverized coal injecting burner is transmitted to the bed to improve the operating efficiency of the melting furnace, thereby increasing a production amount of molten iron and reducing a ratio of a reducing agent.
  • FIG. 1 is a schematic view illustrating a pulverized coal injecting apparatus of a melting furnace according to the present exemplary embodiment.
  • FIG. 2 is a schematic view illustrating an arrangement state of a pulverized coal injecting burner according to the present exemplary embodiment.
  • a pulverized coal injecting apparatus which injects pulverized coal into an upper portion of a bed of a melting furnace includes a pulverized coal injecting burner 20 provided at an upper portion of a dust burner 10 installed in a melting furnace 1 to inject pulverized coal into an upper portion of a bed of the melting furnace.
  • the pulverized coal injecting apparatus includes a dust burner 10, a pulverized coal injecting burner 20, a pulverized coal distributing valve 30, and a control unit 40.
  • one or more dust burners 10 are provided along a circumferential direction of the melting furnace 1 to collect and combust the dust to reinject the dust to the upper portion of the bed of the melting furnace 1 and one or more pulverized coal injecting burners 20 are provided along a circumferential direction of the melting furnace 1 at an upper portion of the dust burner 10 to inject the pulverized coal into the upper portion of the bed of the melting furnace 1.
  • the pulverized coal is injected to the upper portion of the bed of the melting furnace through the pulverized coal injecting burner 20 to control a gas oxidation degree through the injected pulverized coal and thus prevent the temperature of the melting furnace 1 from being lowered due to the lowering of reduction rate.
  • a combust medium such as LNG may be selectively injected into the pulverized coal injecting burner 20 together with the pulverized coal.
  • the dust burner 10 is connected to the pulverized coal distributing valve 30 through a separate pipe to inject the pulverized coal into the upper portion of the bed of the melting furnace.
  • the pulverized coal distributing valve 30 is supplied with the pulverized coal from pulverized coal producing equipment 2 to supply an appropriate amount of pulverized coal to the pulverized coal injecting burner 20.
  • the control unit 40 is electrically connected to the pulverized coal distributing valve 30 to control an amount of pulverized coal supplied to the pulverized coal injecting burner 20.
  • the pulverized coal injecting apparatus supplies the pulverized coal to the pulverized coal injecting burner 20 through the pulverized coal distributing valve 30 and controls the amount of injected pulverized coal through the control unit 40 during the process of supplying the pulverized coal.
  • the pulverized coal injecting burner 20 is connected to the pulverized coal producing equipment 2 to be supplied with the pulverized coal or is connected to the pulverized coal distributing valve 30 which is installed between the pulverized coal producing equipment 2 and a tuyere 50 installed in the melting furnace 1 to be supplied with the pulverized coal.
  • the control unit 40 is connected to the pulverized coal producing equipment 2 and the pulverized coal injecting burner 20 or the dust burner 10 through a connecting line or connected to the pulverized coal distributing valve 30 between the pulverized coal producing equipment 2 and the tuyeres 50 to control the injection of the pulverized coal.
  • the pulverized coal injecting apparatus further includes at least one dust burner 10 which is provided below the pulverized coal injecting burner 20 to selectively and additionally inject the pulverized coal into the upper portion of the bed of the melting furnace.
  • the dust burner 10 may be connected to the pulverized coal producing equipment 2 or the pulverized coal distributing valve 30 provided between the tuyeres 50 provided in the melting furnace 1 to selectively and additionally inject the pulverized coal to the melting furnace 1 together with the dust.
  • the pulverized coal injecting burners 20 are disposed with an interval of 90° along the circumferential direction of the melting furnace 1 to form the same direction as the installation position of the dust burner 10 and are installed at a height of 2.6 m to 3.2 m above the position of the dust burner 10.
  • the pulverized coal injecting burner 20 is installed in an optimized position of the melting furnace 1 to effectively inject the pulverized coal to the upper portion of the bed of the melting furnace.
  • the pulverized coal distributing valve 30 supplies the pulverized coal and oxygen to the tuyere 50 of the melting furnace through a pipe and splits a pipe of the pulverized coal injected to the tuyeres 50 into two branches to be connected to the dust burner 10 so that the pulverized coal may be injected into the upper portion of the bed of the melting furnace through the dust burner 10.
  • FIG. 3 is a schematic view illustrating a structure of a pulverized coal injecting apparatus according to the present exemplary embodiment.
  • the pulverized coal distributing valve 30 may include a pulverized coal supply pipe 60 equipped with a manual valve 61 and an orifice 62 which adjust an injection amount of pulverized coal.
  • the orifice 62 adjusts the injection amount of pulverized coal which is injected into the melting furnace 1 by adjusting the amount of the pulverized coal supplied from the pulverized coal distributing valve 30 while passing through the orifice.
  • a three-way valve 63 which is remotely and automatically controlled by the control unit 40 is provided.
  • the three-way valve 63 may have a structure of injecting inert gas to prevent the blockage of the pulverized coal supply pipe 60 at the time of injecting the pulverized coal.
  • the inert gas may include nitrogen.
  • the three-way valve 63 which is remotely and automatically controlled by the control unit 40 is provided to inject nitrogen into the pipe when the pulverized coal is not injected.
  • the pulverized coal injecting burner 20 further includes an ejector 70 which is provided at a rear end thereof to insert the inert gas into the supplied pulverized coal and the ejector 70 discharges the nitrogen at a high speed to prevent blockage of the pipe.
  • the pulverized coal injecting burner 20 further includes a cooling water pipe 80 into which the cooling water is injected to prevent thermal damage of a front end of the pulverized coal injecting burner 20 and the cooling water pipe 80 may further include an auxiliary pipe 81 through which the inert gas is injected together with cooling water or independently.
  • the cooling water pipe 80 and the auxiliary pipe 81 installed around the pulverized coal injecting burner 20 are installed to secure the safety of the equipment. Particularly, when the cooling water is leaked from the cooling water pipe 80, the nitrogen may be injected to the cooling water pipe 80 through the auxiliary pipe 81 while automatically preventing the injection of the pulverized coal.
  • FIG. 4 is a schematic enlarged view illustrating an inside of a pulverized coal injecting burner according to the present exemplary embodiment.
  • FIG. 5 is a schematic view illustrating an internal lance of a pulverized coal injecting burner according to the present exemplary embodiment.
  • the pulverized coal injecting burner 20 may further include an inner pipe 21 which is inserted therein to secure a flow rate of pulverized coal to be injected. Further, one or more oxygen supply holes 22 are formed in the pulverized coal injecting burner 20 so that the oxygen is in contact with the pulverized coal which passes through the inner pipe 21.
  • one or more supports are provided with an interval from an outer side of the inner pipe 21 to be assembled so that the inner pipe 21 may be easily assembled through the supports 23.
  • the pulverized coal injecting burner 20 is provided with an inner pipe 21 whose diameter is reduced so that the flow rate of the pulverized coal which passes through the pulverized coal injecting burner 20 is increased and thus the pulverized coal and the oxygen may be easily in contact with each other.
  • FIG. 6 is a schematic view illustrating a structure of an ejector of a pulverized coal injecting apparatus according to the present exemplary embodiment.
  • the ejector 70 has a structure in which a gas supply pipe 72 is connected to a pulverized coal inflow pipe 71 to insert the inert gas into the supplied pulverized coal.
  • the ejector supplies the nitrogen through the gas supply pipe 72 at a high speed as if it pumps the nitrogen to prevent the blockage of the pulverized coal inflow pipe 71 into which the pulverized coal is supplied.
  • FIG. 7 is a schematic view illustrating a configuration of a cooling water pipe of a pulverized coal injecting apparatus according to the present exemplary embodiment.
  • the cooling water pipe 80 has a structure in which a cooling water inlet pipe 80A and a cooling water outlet pipe 80B connected to the pulverized coal injecting burner 20 are separately provided in a pipe provided in the dust burner 10 so that a new cooling water pipe of the pulverized coal injecting burner 20 is further provided in addition to the cooling water piper of the dust burner 10 which has been previously provided.
  • the cooling water inlet pipe 80A and the cooling water outlet pipe 80B are provided with respect to the pulverized coal injecting burner 20 so that a cooling water inlet pipe 80a of the dust burner 10 and the cooling water inlet pipe 80A of the pulverized coal injecting burner 20 are connected to each other and a cooling water outlet pipe 80b of the dust burner 10 and the cooling water outlet pipe 80B of the pulverized coal injecting burner 20 are connected to each other.
  • the cooling water pipe 80 is provided to prevent the thermal damage of the front end of the pulverized coal injecting burner 20 so that the equipment stability is secured by injecting the cooling water.
  • FIG. 8 is a flowchart illustrating processes of a pulverized coal injecting method that is an example useful for understanding the invention..
  • a pulverized coal injecting method of a melting furnace may include a step of injecting pulverized coal into an upper portion of a bed of a melting furnace using a pulverized coal injecting burner 20 provided in the melting furnace 1 and a step of controlling an environment of injecting the pulverized coal into the melting furnace.
  • the step of injecting pulverized coal and the step of controlling may further include a pipe installing step S1 of connecting a dust burner 10 using a separate pipe to inject the pulverized coal into the upper portion of the bed of the melting furnace, a pulverized coal injecting burner installing step S2 of installing a pulverized coal injecting burner 20 disposed in the same position as the dust burner 10 above the dust burner 10, and a pulverized coal injecting step S3 of injecting the pulverized coal into the upper portion of the bed of the melting furnace through the pipe and the pulverized coal injecting burner 20 installed as described above.
  • the pulverized coal injecting method injects the pulverized coal into the upper portion of the bed of the melting furnace 1 and includes a process of installing a pipe in the dust burner 10 to use the dust burner 10, a process of independently installing the pulverized coal injecting burner 20 which injects the pulverized coal into the melting furnace 1, and a process of selectively injecting the pulverized coal into the upper portion of the bed of the melting furnace 1 using the dust burner 10 and the pulverized coal injecting burner 20 installed as described above.
  • the pulverized coal injecting burner 20 is connected to the pulverized coal producing equipment 2 to be supplied with the pulverized coal or is connected to a pulverized coal distributing valve 30 which is installed between the pulverized coal producing equipment 2 and a tuyere 50 installed in the melting furnace 1 to be supplied with the pulverized coal.
  • At least one dust burner 10 is installed below the pulverized coal injecting burner 20 to selectively and additionally inject the pulverized coal into the upper portion of the bed of the melting furnace 1.
  • the dust burner 10 may be connected to the pulverized coal producing equipment 2 or the pulverized coal distributing valve 30 installed between the tuyeres 50 provided in the melting furnace 1 to selectively and additionally inject the pulverized coal into the melting furnace 1 together with the dust.
  • a pipe of the pulverized coal injected to the tuyeres 50 of the melting furnace 1 is split into two branches to be connected to the dust burner 10 so that the pulverized coal may be injected through the dust burner 10.
  • a pulverized coal injecting pipe is installed in the pulverized coal distributing valve 30 which supplies the pulverized coal to be connected to the dust burner 10 so that the pulverized coal is injected through the dust burner 10.
  • the pulverized coal may be injected into the upper portion of the bed of the melting furnace 1 using the dust burner 10.
  • the pulverized coal injecting burner 20 are disposed with an interval of 90° along the circumferential direction of the melting furnace 1 at a height of 2.6 m to 3.2 m above the position of the dust burner 10.
  • the pulverized coal injecting burner 20 is disposed along the circumferential direction of the melting furnace 1 in the same position as the dust burner 10 with a height difference above the dust burner 10.
  • the cooling water pipe 80 is installed in the pulverized coal injecting burner 20 and an auxiliary pipe 81 is connected to the cooling water pipe 80 to prevent the injection of the pulverized coal at the time of leaking the cooling water and inject nitrogen for back-up.
  • the cooling water pipe 80 and the auxiliary pipe 81 which are installed around the pulverized coal injecting burner 20 are installed to secure the safety of the equipment.
  • the pulverized coal is directly injected into the pulverized coal injecting burner 20.
  • the pipe of the pulverized coal injected into the tuyere 50 is split to inject the pulverized coal into the dust burner 10.
  • the pulverized coal is injected to the dust burner 10 through the pulverized coal injecting pipe.
  • the pulverized coal may be injected through any one of three processes.
  • a control unit 40 which controls an injection amount of the pulverized coal is installed to control the entire injection amount of the melting furnace 1 by controlling a rotation speed of a rotating supply device included in the pulverized coal supply equipment to control an injection amount of the pulverized coal which is injected into the upper portion of the bed of the melting furnace.
  • step S3 of injecting the pulverized coal into the upper portion of the bed of the melting furnace whether the pulverized coal is injected to the dust burner 10 and an injection amount are calculated based on a changed amount of carbon dioxide in excess gas of the melting furnace 1 to be measured through a flow meter.
  • a gas oxidation degree and an ore reduction rate in accordance with an injection amount of the pulverized coal of the dust burner 10 are represented in the following Table 1.
  • Table 1 Dust Load to Hot cyclone Recycled Dust Carbon in dust Combustion oxygen Excess oxygen Oxygen in PCI burner PCI to PCI Burner (Two devices are applied)
  • Lowered CO2 in gas (oxidation degree) Increased rate of reduction rate g/m3 t/h t/h Nm3/h Nm3/h Nm3/h t/h (t/h) /EA % % 50 23 9 8,715 13,785 13.785 17.4 8.6 -5.9 9.1 10.500 13.2 6.6 -4.5 7.0 7.440 9.4 4.6 -3.3 5.0 4.400 5.6 2.8 -2.0 3.0 2.900 3.6 1.8 -1.3 2.0 1.500 1.9 1.0 -0.7 1.0
  • the pulverized coal is injected into the upper portion of the bed of the melting furnace 1 to block combustion of carbon monoxide gas due to excessive oxygen and an amount of generated carbon monoxide gas is increased to drastically lower the oxidation degree of the reduced gas and thus increase the ore reduction rate of the fluidizing furnace.
  • the injection amount of the pulverized coal is increased to supplement a content of carbon monoxide, thereby constantly maintaining the oxidation degree.
  • the pulverized coal injecting apparatus of a melting furnace includes a reducing furnace 7 and a melting furnace 1.
  • the pulverized coal injecting apparatus of a melting furnace may further include other devices as needed.
  • Iron ore is charged in the reducing furnace 7 to be reduced.
  • the iron ore which is charged in the reducing furnace 7 is dried in advance and then produced as reduced iron while passing through the reducing furnace 7.
  • the reducing furnace 7 is a packed bed type reducing furnace and is supplied with reduced gas from the melting furnace 1 to form a packed bed therein.
  • the melting furnace 1 is connected to the reducing furnace 7 to be supplied with reduced iron produced in the reducing furnace 7 and charged with coal briquette or coal produced in a coal briquette producing apparatus.
  • the reduced iron and coal charged into the melting furnace 1 and dried and distillated char form a bed 3 in the melting furnace 1.
  • a dome 9 is formed in an upper portion of the melting furnace 1.
  • the dome 9 is formed above the bed 3 and has a broader space than other parts of the melting furnace 1. In the dome, a reduced gas with a high temperature exists.
  • the coal briquette is charged into the dome 9 of the melting furnace 1 and then rapidly heated to fall down to a lower portion of the melting furnace 1.
  • the char generated by thermal decomposition reaction of the coal briquette moves to the lower portion of the melting furnace 1 to exothermically react with oxygen supplied through the tuyere 50.
  • the coal briquette may be used as a heat source which maintains the melting furnace 1 at a high temperature.
  • the char provides permeability, a large amount of gas generated in the lower portion of the melting furnace 1 and reduced iron supplied from the reducing furnace 7 may easily and uniformly pass through the bed 3 in the melting furnace 1.
  • bulk cinder or cokes may be charged in the melting furnace 1 as needed.
  • the tuyere 50 is installed on an outer wall of the melting furnace 1 to inject oxygen.
  • the oxygen is injected into the bed 3 to form a combustion zone 8.
  • the coal briquette is combusted in the combustion zone 8 to generate reduced gas.
  • the melting furnace 1 includes a dust burner 10 and a pulverized coal injecting burner 20.
  • the dust burner 10 injects oxygen into the dome 9 to decompose and combust the dust and the dried and distillated gas generated in the melting furnace 1.
  • the dust burner 10 is located between the bed 3 and the dome 9.
  • a plurality of dust burners may be provided along an internal circumference of the melting furnace 1.
  • the dust burner 10 may be installed with a predetermined distance from an upper surface of the bed 3, that is, at a height of approximately 2 m or higher and approximately 3 m or lower. When the dust burner 10 is located to be too close to the bed 3, the flame of the dust burner 10 hits the upper surface of the bed 3 to be in contact therewith so that dust is excessively generated and a risk of damaging the dust burner 10 is increased.
  • the dust burner 10 is located to be approximately 2 m or higher and approximately 3 m or lower from the surface of the bed 3. In this case, most of the calorie generated in the dust burner 10 is not used to raise the temperature of the bed 3 but is used to raise the temperature of the dome 8 so that the temperature of the dome 9 is unnecessarily increased and the operating efficiency of the melting furnace 1 may be deteriorated.
  • the pulverized coal injecting burner 20 is located between the dust burner 10 and the bed 3.
  • the pulverized coal injecting burner 20 may be located at a height of approximately 1.3 m or higher and approximately 1.7 m or lower from the surface of the bed 3.
  • the pulverized coal injecting burner 20 is located such that the flame of the pulverized coal injecting burner 20 supplies sufficient calorie to the surface of the bed 3 without being in direct contact with the bed 3.
  • the pulverized coal injecting burner 20 is too far away from the surface of the bed 3, heat is not effectively supplied to the bed 3.
  • the pulverized coal injecting burner 20 may be broken.
  • FIG. 11 is an enlarged view of a portion A of FIG. 2 .
  • the pulverized coal injecting burner 20 injects pulverized coal 5 and oxygen 6 into the melting furnace 1 to combust the pulverized coal 5.
  • combustion heat generated in the pulverized coal injecting burner 20 by combustion flame 11 is transmitted to the bed 3 to raise the temperature of the bed 3.
  • the pulverized coal injecting burner 20 injects any one fuel of pulverized coal, liquefied natural gas, and coke oven gas to combust the pulverized coal.
  • FIG. 12 is a top plan view schematically illustrating a melting furnace that is an example useful for understanding the invention.
  • a plurality of dust burners 10 may be provided along an inner circumference of the melting furnace 1 and as illustrated in FIG. 12 , four dust burners 10 may be installed in the dome 9.
  • the pulverized coal injecting burner 20 may be located along the inner circumference of the melting furnace 1 so as not to overlap the dust burner 10. That is, the pulverized coal injecting burner 20 may be located between dust burners 10 in a circumferential direction and four pulverized coal injecting burners 20 may be provided.
  • the dust burner 10 located above the pulverized coal injecting burner 20 may be damaged due to the combustion flame of the pulverized coal injecting burner 20.
  • the ratio of oxygen which is injected to the dust burner 10 and the pulverized coal injecting burner 20 is approximately 6:4 to approximately 7:3.
  • oxygen which is injected into the pulverized coal injecting burner 20 is too much, an amount of oxygen which is injected into the dust burner 10 is too small, so that volatile matter generated from the dust and coal in the dome 9 may not be sufficiently combusted or decomposed.
  • an amount of oxygen injected into the pulverized coal injecting burner 20 is too small, a size of the combustion flame is reduced so that an effect of raising a temperature of the bed 3 is lowered.
  • the oxygen injection ratio of the pulverized coal injecting burner 20 is managed with respect to a temperature of the dome 9.
  • the temperature of the dome 9 is increased to approximately 1070 degrees or higher, the amount of oxygen of the dust burner 10 is reduced and an amount of oxygen of the pulverized coal injecting burner 20 is increased so that more combustion heat generated in the pulverized coal injecting burner 20 flows to the bed 3.
  • the amount of oxygen of the pulverized coal injecting burner 20 is reduced and an amount of oxygen of the dust burner 10 is increased so that the combustion heat generated in the dust burner 10 raises a temperature of a gas of the dome 9.
  • FIG. 13 is a graph illustrating a temperature rising ratio of a bed of a melting furnace by comparing with a temperature rising ratio of the related art
  • FIG. 14 is a graph illustrating a rising temperature of a bed of a melting furnace by comparing with a rising temperature of the related art
  • FIG. 15 is a graph illustrating an effect of increasing a production amount of molten iron of a pulverized coal injecting apparatus of a melting furnace by comparing with that of the related art
  • FIG. 16 is a graph illustrating an effect of reducing a coal usage rate of a pulverized coal injecting apparatus of a melting furnace by comparing with that of the related art.
  • an interval between the dust burner 10 and the bed 3 of the melting furnace 1 is lowered from 3 m of the related art to 1.5 m to carry out a practical simulation test operation.
  • a ratio of heat which raises a temperature of the dome 9, of the combustion heat generated in the dust burner 10 and the pulverized coal injecting burner 20 is reduced but a ratio of heat which raises the temperature of the bed 3 is increased from approximately 22% of the related art to approximately 31%.
  • the temperature of the bed 3 is increased from approximately 210 degrees of the related art to approximately 340 degrees.
  • a temperature rising effect of the bed 3 improves an operation performance. Therefore, it is understood that as illustrated in FIG. 15 , a daily molten iron production amount is increased from approximately 5200 ton of the related art to approximately 5500 ton and as illustrated in FIG. 16 , a coal usage ratio (fuel ratio) is lowered from approximately 860 kg/t-p of the related art to approximately 820 kg/t-p.
  • the pulverized coal injecting burner which injects pulverized coal and oxygen to combust the pulverized coal is provided between the dust burner and the surface of the bed to prevent the flame of the dust burner from hitting the upper surface of the bed to be in contact therewith to generate the dust and the dust burner from being damaged.
  • the pulverized coal injecting burner is installed in an appropriate location so that the flame of the pulverized coal injecting burner may supply sufficient calorie to the surface of the bed without being in direct contact with the bed.
  • an amount of oxygen injected to the upper dust burner is reduced as much as an amount of oxygen which is injected into the pulverized coal injecting burner, so that a supply amount to the dome may be constantly maintained.
  • the combust calorie generated in the pulverized coal injecting burner is transmitted to the bed to improve the operating efficiency of the melting furnace, thereby increasing a production amount of molten iron and reducing a ratio of reducing agent.
  • an ore reduction rate of the fluidizing furnace is easily controlled by controlling the gas oxidation degree and thus rapid repetitive fluctuation of the molten iron temperature due to the lowering of the reduction rate may be reduced.
  • a normal operation of the melting furnace is consistently maintained so that a quality of the molten iron may be stabilized and a molten iron producing cost may be saved.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Environmental & Geological Engineering (AREA)
  • Manufacture Of Iron (AREA)

Claims (13)

  1. Appareil d'injection de charbon pulvérisé d'un four de fusion (1), l'appareil d'injection de charbon pulvérisé comprenant :
    au moins un brûleur d'injection de charbon pulvérisé (20) qui est installé au niveau d'une portion supérieure d'un lit d'un four de fusion (1) ;
    une unité de commande qui commande une quantité d'injection de charbon pulvérisé fournie au brûleur d'injection de charbon pulvérisé ; et
    au moins un brûleur de poussière qui est prévu sous le brûleur d'injection de charbon pulvérisé pour injecter de manière sélective et additionnelle le charbon pulvérisé dans la portion supérieure du lit du four de fusion,
    dans lequel le brûleur d'injection de charbon pulvérisé (20) est raccordé à un équipement de production de charbon pulvérisé (2) qui doit être alimenté en charbon pulvérisé ou est raccordé à une vanne de distribution de charbon pulvérisé (30) qui est installée entre l'équipement de production de charbon pulvérisé (2) et une tuyère (50) installée dans le four de fusion (1) qui doit être alimenté en charbon pulvérisé,
    caractérisé en ce que l'au moins un brûleur d'injection de charbon pulvérisé (20) est prévu au niveau d'une portion supérieure de l'au moins un brûleur de poussière (10).
  2. Appareil d'injection de charbon pulvérisé selon la revendication 1, dans lequel le brûleur de poussière (10) est raccordé à l'équipement de production de charbon pulvérisé (2) ou à une vanne de distribution de charbon pulvérisé (30) prévue entre les tuyères (50) fournies dans le four de fusion (1) pour injecter de manière sélective et additionnelle le charbon pulvérisé dans le four de fusion (1) conjointement à la poussière.
  3. Appareil d'injection de charbon pulvérisé selon la revendication 2, dans lequel la vanne de distribution de charbon pulvérisé (30) comporte un tuyau d'alimentation en charbon pulvérisé (60) équipé d'une vanne manuelle (61) et d'un orifice (62) qui sont adaptés pour ajuster une injection de charbon pulvérisé.
  4. Appareil d'injection de charbon pulvérisé selon la revendication 3, dans lequel dans le tuyau d'alimentation en charbon pulvérisé (60), une vanne à trois voies (63) qui est commandée à distance et automatiquement par l'unité de commande (40) est prévue.
  5. Appareil d'injection de charbon pulvérisé selon la revendication 4, dans lequel la vanne à trois voies (63) présente une structure d'injection de gaz inerte au moment de l'injection du charbon pulvérisé et est adaptée pour empêcher l'obstruction du tuyau d'alimentation en charbon pulvérisé.
  6. Appareil d'injection de charbon pulvérisé selon la revendication 1, dans lequel le brûleur d'injection de charbon pulvérisé (20) comporte en outre un éjecteur (70) qui est prévu à une extrémité arrière de celui-ci pour insérer un gaz inerte dans le charbon pulvérisé fourni.
  7. Appareil d'injection de charbon pulvérisé selon la revendication 1, dans lequel le brûleur d'injection de charbon pulvérisé (20) comporte en outre un tuyau d'eau de refroidissement (80) dans lequel de l'eau de refroidissement est injectée pour empêcher un endommagement thermique d'une extrémité avant du brûleur d'injection de charbon pulvérisé (20).
  8. Appareil d'injection de charbon pulvérisé selon la revendication 7, dans lequel le tuyau d'eau de refroidissement (80) comporte en outre un tuyau auxiliaire (81) par lequel le gaz inerte est injecté conjointement à de l'eau de refroidissement ou indépendamment.
  9. Appareil d'injection de charbon pulvérisé selon la revendication 1, dans lequel le brûleur d'injection de charbon pulvérisé (20) comporte en outre un tuyau interne (21) qui est inséré dans celui-ci pour assurer un débit de charbon pulvérisé qui doit être injecté.
  10. Appareil d'injection de charbon pulvérisé selon la revendication 9, dans lequel le brûleur d'injection de charbon pulvérisé (20) présente une structure dans laquelle un ou plusieurs orifices d'alimentation en oxygène (22) sont formés dans celui-ci de sorte que l'oxygène soit en contact avec le charbon pulvérisé qui passe par le tuyau interne (21).
  11. Appareil d'injection de charbon pulvérisé selon la revendication 9, dans lequel le tuyau interne (21) est configuré de sorte qu'un ou plusieurs supports (23) soient prévus avec un intervalle depuis un côté externe du tuyau interne (21) pour être assemblés.
  12. Appareil d'injection de charbon pulvérisé selon la revendication 6, dans lequel l'éjecteur (70) est configuré de sorte qu'un tuyau d'alimentation en gaz (72) soit raccordé à un tuyau d'entrée de charbon pulvérisé (71) pour insérer un gaz inerte dans le charbon pulvérisé fourni.
  13. Appareil d'injection de charbon pulvérisé selon la revendication 7, dans lequel le tuyau d'eau de refroidissement (80) est configuré de sorte qu'un tuyau d'entrée d'eau de refroidissement (80A) et qu'un tuyau de sortie d'eau de refroidissement (80B) raccordés au brûleur d'injection de charbon pulvérisé (20) soient prévus séparément dans un tuyau prévu dans le brûleur de poussière (10).
EP16830798.1A 2015-07-27 2016-07-25 Appareil pour souffler de la poussière de charbon d'un four de fusion Active EP3330387B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
KR1020150106152A KR101739861B1 (ko) 2015-07-27 2015-07-27 용융로의 미분탄 취입장치 및 그 취입방법
KR20150174150 2015-12-08
PCT/KR2016/008111 WO2017018765A1 (fr) 2015-07-27 2016-07-25 Appareil pour souffler de la poussière de charbon d'un four de fusion et son procédé de soufflage

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EP3330387A1 EP3330387A1 (fr) 2018-06-06
EP3330387A4 EP3330387A4 (fr) 2018-06-20
EP3330387B1 true EP3330387B1 (fr) 2020-05-06

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CN117004784B (zh) * 2023-10-07 2023-11-28 山西建龙实业有限公司 一种高炉喷吹煤粉用氮气的预热系统

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KR920010525B1 (ko) * 1990-09-08 1992-12-04 포항종합제철 주식회사 압축공기를 이용한 미분탄 취입라인의 관통방법
JPH0995724A (ja) * 1995-10-02 1997-04-08 Nkk Corp スクラップ溶解法
JP3349337B2 (ja) * 1996-04-02 2002-11-25 三菱重工業株式会社 湿式炉用バーナ
KR100584735B1 (ko) * 2001-10-11 2006-05-30 주식회사 포스코 콜 더스트 취입장치를 갖는 코렉스 용융로
KR100985238B1 (ko) * 2003-07-08 2010-10-04 주식회사 포스코 고로 가스이용률 변동에 따른 미분탄 취입량 제어장치
CN100455678C (zh) * 2006-01-25 2009-01-28 中冶赛迪工程技术股份有限公司 熔融还原炉喷吹煤粉工艺
CN101498554B (zh) * 2009-03-12 2010-09-15 北京首钢自动化信息技术有限公司 高炉串罐自动喷煤控制系统及方法
JP6015915B2 (ja) * 2012-09-20 2016-10-26 三菱重工業株式会社 高炉設備
EP2821509A1 (fr) * 2013-07-01 2015-01-07 Siemens VAI Metals Technologies GmbH Désulfurisation de gaz dans la fabrication de fonte brute
CN104946841A (zh) * 2014-03-27 2015-09-30 宝山钢铁股份有限公司 利用corex炉进行炼铁的工艺

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EP3330387A4 (fr) 2018-06-20
WO2017018765A1 (fr) 2017-02-02
WO2017018765A8 (fr) 2017-03-16
EP3330387A1 (fr) 2018-06-06
CN108026596A (zh) 2018-05-11

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