CN112094977B - Process and system for efficient smelting of double-furnace electric-converter - Google Patents

Process and system for efficient smelting of double-furnace electric-converter Download PDF

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Publication number
CN112094977B
CN112094977B CN202010870144.8A CN202010870144A CN112094977B CN 112094977 B CN112094977 B CN 112094977B CN 202010870144 A CN202010870144 A CN 202010870144A CN 112094977 B CN112094977 B CN 112094977B
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smelting
electrode
oxygen lance
furnace
smoke hood
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CN112094977A (en
Inventor
朱荣
冯超
夏韬
魏光升
董凯
李伟峰
韩宝臣
吴学涛
武文合
姜娟娟
董建锋
陈圣桢
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University of Science and Technology Beijing USTB
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University of Science and Technology Beijing USTB
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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
    • 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
    • C21C5/42—Constructional features of converters
    • C21C5/46—Details or accessories
    • 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
    • C21C5/52—Manufacture of steel in electric furnaces
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C33/00—Making ferrous alloys
    • C22C33/04—Making ferrous alloys by melting
    • C22C33/06—Making ferrous alloys by melting using master alloys
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/002—Ferrous alloys, e.g. steel alloys containing In, Mg, or other elements not provided for in one single group C22C38/001 - C22C38/60
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/02—Ferrous alloys, e.g. steel alloys containing silicon
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22C—ALLOYS
    • C22C38/00—Ferrous alloys, e.g. steel alloys
    • C22C38/04—Ferrous alloys, e.g. steel alloys containing manganese
    • 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
    • Y02P10/20—Recycling

Abstract

The invention relates to the technical field of ferrous metallurgy, in particular to a process and a system for high-efficiency smelting of a double-furnace electric-converter, which enable a steel-making process to be more flexible and a smelting process to be more efficient. The system mainly comprises a smelting furnace, an oxygen lance system, an electrode system, a movable smoke hood system, an oxygen lance transverse trolley guide rail, an oxygen lance lifting trolley rail, a flue, a coal gas storage cabinet and a diffusion chimney. Adding metal materials with any scrap steel ratio into one smelting furnace, preheating and melting by adopting an electrode, then supplying oxygen by using an oxygen lance system to realize efficient smelting, moving the electrode to the other smelting furnace filled with the metal materials to heat and melt, supplying oxygen by using the oxygen lance system to realize efficient smelting, recycling the electrode and the oxygen lance system, and realizing recycling of tapping of the two smelting furnaces. The invention is suitable for the smelting process with the steel tapping quantity of 30-400t, can realize the smelting requirements of any scrap steel ratio, steel type and process, and the larger the scrap steel ratio is, the more obvious the advantages of the invention are, and the average yield is improved by more than 40%.

Description

Process and system for efficient smelting of double-furnace electric-converter
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a process and a system for high-efficiency smelting of a double-furnace electric-converter, which enable a steel-making process to be more flexible and a smelting process to be more efficient.
The system mainly comprises a smelting furnace, an oxygen lance system, an electrode system, a movable smoke hood system, an oxygen lance transverse trolley guide rail, an oxygen lance lifting trolley rail, a flue, a coal gas storage cabinet and a diffusion chimney. Adding metal materials with any scrap steel ratio into one smelting furnace, preheating and melting by adopting an electrode, then supplying oxygen by using an oxygen lance system to realize efficient smelting, moving the electrode to the other smelting furnace filled with the metal materials to heat and melt, supplying oxygen by using the oxygen lance system to realize efficient smelting, recycling the electrode and the oxygen lance system, and realizing recycling of tapping of the two smelting furnaces. The invention is suitable for the smelting process with the steel tapping quantity of 30-400t, can realize the smelting requirements of any scrap steel ratio, steel type and process, and the larger the scrap steel ratio is, the more obvious the advantages of the invention are, and the average yield is improved by more than 40%.
Background art:
at present, a converter or an electric arc furnace is mainly adopted for steel smelting at home and abroad as main smelting equipment, the converter steelmaking has the advantages of high smelting efficiency and large monomer equipment, and the electric arc furnace steelmaking has the advantages of short process and low investment cost, and can realize full scrap steel smelting.
The main measure for improving the ratio of the converter smelting steel scrap is an external heating source, but the improvement of the ratio of the steel scrap is limited by the heat balance of the converter smelting, so the charging system of the metal materials can be adjusted only within a certain range. The electric arc furnace smelting can realize full scrap steel smelting or high scrap steel ratio smelting, but the smelting period is longer, and the comprehensive index consumption is higher than that of converter smelting, so the relative production cost is higher.
Converter smelting and electric arc furnace smelting both have advantages and limitations, so that the advantages of converter smelting and electric arc furnace smelting are fully exerted through equipment adjustment and process optimization, the smelting efficiency, the energy conservation and the like can be realized, and the yield per unit time can be improved.
Disclosure of Invention
The invention aims to provide a process and a system for high-efficiency smelting of a double-furnace electric-converter, so that the steelmaking process is more flexible and the smelting process is more efficient.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a system for high-efficiency smelting of a double-furnace electric-converter comprises a first smelting furnace, a second smelting furnace, a first oxygen lance system, a second oxygen lance system, an electrode system, a first movable smoke hood system, a second movable smoke hood system, a oxygen lance transverse trolley guide rail, a first oxygen lance lifting trolley track, a second oxygen lance lifting trolley track, a first flue, a second flue, a coal gas storage cabinet, a first diffusion chimney and a second diffusion chimney. The oxygen lance system is connected with an oxygen lance transverse trolley guide rail, the oxygen lance system is connected with an oxygen lance lifting trolley track I, a movable smoke hood system and a smelting furnace I in a working state, an oxygen lance system II is connected with an oxygen lance lifting trolley track II, a movable smoke hood system II and a smelting furnace II in a working state, one part of the movable smoke hood system is connected with the smelting furnace I in a working state, the other part of the movable smoke hood system is connected with a flue I, the flue I is connected with a diffusing chimney I, one part of the movable smoke hood system II is connected with the smelting furnace II in a working state, the other part of the movable smoke hood system is connected with a flue II, the flue II is connected with the diffusing chimney II, one end of a gas storage cabinet is connected with the flue I, the other end of the gas storage cabinet is connected with the flue II, an electrode system rotates clockwise and is connected with the movable smoke hood system I and the smelting furnace I.
Further, the system has the tapping quantity of the first smelting furnace and the second smelting furnace of 30-400t, and the ratio of the height to the diameter of 0.2-2.5.
Furthermore, the system comprises a first oxygen lance system, a first lifting car and a first oxygen lance, a second oxygen lance system comprises a second lifting car, a second lifting car and a second oxygen lance, the lifting capacity of the first lifting car and the second lifting car is 0-40t, and the outer diameters of the first oxygen lance and the second oxygen lance are 108-630 mm.
Furthermore, the electrode system of the system comprises an electrode rotating and lifting arm, an electrode supporting arm and an electrode, wherein the clockwise and anticlockwise rotating angles of the electrode rotating and lifting arm are 0-90 degrees, the lifting height relative to the furnace bottoms of the first smelting furnace and the second smelting furnace is 0.5-50m, and the diameter of the electrode is 100-1500 mm.
Further, this system activity petticoat pipe system contain petticoat pipe drive arrangement one, activity petticoat pipe a support arm, activity petticoat pipe one, the pneumatic device of cutting soon is put, the export of activity petticoat pipe, activity petticoat pipe system two contains petticoat pipe drive arrangement two, two support arms of activity petticoat pipe, activity petticoat pipe two, the pneumatic device of cutting soon is put two, the export of activity petticoat pipe two, has 3 electrode jack and 1 oxygen rifle jack on activity petticoat pipe one and the activity petticoat pipe two respectively, its relative smelting furnace one and the lifting height of smelting furnace two furnace mouths be 0-4 m.
Furthermore, the first flue of the system comprises a first flue movable interface, the second flue comprises a second flue movable interface, the diameter of the first flue movable interface and the second flue movable interface is 325-6000mm, the telescopic length is 0.5-10m, and the first flue and the second flue are provided with a waste heat recovery system and a flue gas purification system.
Furthermore, the volume of the gas storage cabinet of the system is 2000-100000m3。
Another object of the present invention is to provide a process for high-efficiency smelting in a twin-furnace electric-converter using the above system, which comprises charging a first smelting furnace with a metal material of any scrap-to-steel ratio, driving a supporting arm of a movable hood to place the first movable hood above the first smelting furnace, extending a movable port of a flue to connect with an outlet of the first movable hood, opening 3 electrode jacks using a first pneumatic quick-cutting device, rotating the electrode supporting arm clockwise to place the electrode directly above the first movable hood, lowering the electrode into the first smelting furnace, starting arc to start heating up to melt the metal material, lifting the electrode after cleaning, closing the 3 electrode jacks using the first pneumatic quick-cutting device, charging a second smelting furnace with a metal material of any scrap-to-steel ratio, driving a second supporting arm of the movable hood to place the second movable hood above the second smelting furnace, extending a second movable port of the flue to connect with an outlet of the second movable hood, and (2) opening 3 electrode jacks by using a second pneumatic quick-cutting device, rotating the electrode supporting arm anticlockwise to enable the electrode to be arranged right above the second movable smoke hood, descending the electrode to start heating the metal material, simultaneously driving an oxygen lance system to be positioned above an oxygen lance lifting car track by using a first transverse moving trolley, opening the oxygen lance jacks by using the first pneumatic quick-cutting device, descending the oxygen lance into a first smelting furnace by using the first lifting car, blowing oxygen to ignite and carry out smelting operation, lifting the first lifting car to a standby position after the smelting requirement is met, and tapping, circulating the operation process, and carrying out circulating tapping by using a double-furnace body, thereby realizing the purpose of efficient smelting.
Further, the process specifically comprises the following steps:
step 1: metal materials such as scrap steel, molten iron and the like are loaded into the first smelting furnace, and a supporting arm of the movable smoke hood is driven to enable the first movable smoke hood to be arranged above the first smelting furnace, and a movable connector of the extended flue is connected with an outlet of the first movable smoke hood;
step 2: opening 3 electrode jacks by using a first pneumatic quick cutting device, and rotating an electrode supporting arm clockwise to enable an electrode to be arranged right above a movable smoke hood; descending the electrode into the first smelting furnace, starting arc striking, heating to melt the metal material, lifting the electrode after the metal material is dissolved, closing 3 electrode jacks by using a first pneumatic quick cutting device, and rotating the electrode to a zero position;
and step 3: driving an oxygen lance system to be located above an oxygen lance lifting car track by using a transverse trolley I, opening an oxygen lance insertion hole by using a pneumatic quick cutting device I, descending the oxygen lance into a smelting furnace I by using a lifting car I, blowing oxygen for ignition and carrying out smelting operation, lifting the lifting car I to a standby position after the smelting requirement is met, and tapping;
and 4, step 4: when the electrode is lifted in the step 2, metal materials with any scrap steel ratio are loaded into a second smelting furnace, the support arm of the second movable smoke hood is driven to enable the second movable smoke hood to be placed above the second smelting furnace, and the movable connector of the second elongated flue is connected with the outlet of the second movable smoke hood;
and 5: opening 3 electrode jacks by using a second pneumatic quick-cutting device, rotating the electrode supporting arm anticlockwise to enable the electrode to be placed right above the second movable smoke hood, and descending the electrode to start heating the metal material;
step 6: and (5) the operation processes of the step (1) and the step (5) are circulated, so that the double-furnace body can discharge steel circularly, and the aim of efficient smelting is fulfilled.
Further, the furnace volume ratio of the first smelting furnace to the second smelting furnace is 0.7-1.8 m3/t。
Further, the gas medium of the oxygen lance system I and the oxygen lance system II is O2, N2, CO2 or the mixture of several gases, and the gas flow range is 2000-95000Nm3Gas pressure range of 0.5-2.0MPa, gas consumption of 30-70Nm3/t。
Furthermore, the electrodes in the electrode system are three-phase alternating current electrodes, the electrode consumption is 0-3kg/t, the input power is 50-1500kVA/t, and the power consumption is 0-700 kWh/t.
Further, the flue gas flow of the first flue and the second flue is 0-300000Nm3/h。
Further, the process and the system are suitable for smelting operation with the steel tapping amount of 30-400 t.
The beneficial effects of the invention include:
1) the process and the system can adapt to smelting of any metal material structure, can flexibly adjust the smelting process according to the factors such as the supply capacity, the price and the like of metal materials such as molten iron, scrap steel, ore and the like, and realize the maximization of profits;
2) the process and the system can improve the smelting efficiency through the unified coordination operation of the double furnace bodies, the oxygen lance and the electrode, and compared with the traditional converter or electric arc furnace smelting process, the process and the system can realize the increase of the yield.
Drawings
FIG. 1 is a schematic diagram of a double-furnace electric-converter efficient smelting system.
In the figure: 1-a first smelting furnace, 2-a second smelting furnace, a first 3-oxygen lance system, 3-1-a first traversing trolley, a first 3-2-lifting trolley, a first 3-3-oxygen lance, a second 4-oxygen lance system, a second 4-1-a second traversing trolley, a second 4-2-lifting trolley, a second 4-3-oxygen lance, a 5-electrode system, a 5-1-electrode rotating lifting arm, a 5-2-electrode supporting arm, a 5-3-electrode, a 6-movable smoke hood system, a first 6-1-smoke hood driving device, a first 6-2-movable smoke hood supporting arm, a first 6-3-movable smoke hood, a first 6-4-pneumatic quick cutting device and a first 6-5-movable smoke hood outlet, 7-movable smoke hood system II, 7-1-smoke hood driving device II, 7-2-movable smoke hood second supporting arm, 7-3-movable smoke hood second, 7-4-pneumatic quick cutting device II, 7-5-movable smoke hood second outlet, 8-oxygen lance transverse moving trolley guide rail, 9-oxygen lance lifting trolley track I, 10-oxygen lance lifting trolley track II, 11-flue I, 11-1-flue I movable interface, 12-flue II, 12-1-flue II movable interface, 13-gas storage cabinet, 14-emission chimney I, 15-emission chimney II.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the following embodiments are further described in detail. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
On the contrary, the invention is intended to cover alternatives, modifications, equivalents and alternatives which may be included within the spirit and scope of the invention as defined by the appended claims. Furthermore, in the following detailed description of the present invention, certain specific details are set forth in order to provide a better understanding of the present invention. It will be apparent to one skilled in the art that the present invention may be practiced without these specific details.
Example (b):
the invention is applied to two smelting furnaces with the capacity of 130t and the steel tapping quantity of 100t, the height-diameter ratio is 1.0, the furnace capacity ratio is 1.1, the outer diameter of the selected oxygen lance nozzle is 273mm, the hole number is 4 holes, the Mach number is 1.8, and the total air supply flow is 21000Nm3The medium is CO2+ O2, the mixing proportion of CO2 is 10%, the operating oxygen pressure is 0.9MPa, the input power is 800kVA/t, and the diameter of the electrode is 600 mm.
1) Collecting the components and the quality information of metal materials, wherein the mass of the scrap steel is 91t, the mass of the molten iron is 39t, calculating the use amounts of a heating agent and a slagging agent, and the components of the molten iron and the components of the scrap steel are shown in Table 1;
TABLE 1 composition of the Metal materials
Name (R) C/％ Si/％ Mn/％ P/％ S/％
Molten iron 4.21 0.41 0.56 0.097 0.043
Scrap steel 0.10 0.05 0.20 0.015 0.010
2) After scrap steel and molten iron are loaded into the first smelting furnace, a supporting arm of the movable smoke hood is driven to enable the first movable smoke hood to be arranged above the first smelting furnace, and a movable connector of the extended flue is connected with an outlet of the first movable smoke hood;
3) opening 3 electrode jacks by using a first pneumatic quick cutting device, and clockwise rotating the electrode supporting arm by 40 degrees to enable the electrode to be arranged right above the movable smoke hood; descending the electrode into the first smelting furnace, electrifying to strike an arc, starting to heat up the molten metal material, after dissolving for 40min, lifting the electrode to the position above the first movable smoke hood, wherein the power consumption is 240kWh/t, closing 3 electrode jacks by using a first pneumatic quick cutting device, and rotating the electrode to a zero position;
4) the oxygen lance system is driven to the upper part of the oxygen lance lifting vehicle track by using the transverse trolley I, and the oxygen lance jack is opened by using the pneumatic quick cutting device I, lowering an oxygen lance into a first smelting furnace through a first lifting truck, blowing oxygen for ignition, carrying out smelting operation, adding a slagging agent and a heating agent from a high-level storage bin, wherein the heating agent is anthracite, the lumpiness is 20-50mm, the fixed carbon content is more than 80%, the sulfur content is less than 0.5%, the adding amount is 43kg/t, the heating agent is completely added within 2min of open blowing, the lime consumption is 10kg/t, adding 2/3 for open blowing and adding the rest 1/3 for smelting 3min, adopting a low-high-low gun position as an operation gun position, a carbon pulling gun position is 1.2m, and oxygen supply time is 10min, lifting the first lifting truck to a standby position after the smelting requirement is met, and tapping 100 t;
5) when the electrode is lifted in the step 2), starting to load 70% of scrap steel and 30% of metal materials into a second smelting furnace, driving a second supporting arm of the movable smoke hood to enable the second movable smoke hood to be arranged above the second smelting furnace, and connecting a movable connector of the second extension flue with an outlet of the second movable smoke hood;
6) after the step 4) is finished, opening 3 electrode jacks by using a second pneumatic quick-cutting device, rotating the electrode supporting arm 40 degrees anticlockwise, enabling the electrode to be arranged right above the second movable smoke hood, descending the electrode to start heating the metal material, and the operation mode is the same as that of the step 3);
7) after the step 5) is finished, an oxygen lance system II is adopted for oxygen supply operation, and the specific steps are similar to the step 3);
8) and (3) the operation processes of the steps 1) and 6) are circulated, so that the continuous steel tapping of the double-furnace body is realized in a sequential circulation manner, and compared with a metal material structure with the scrap ratio of 70% in a traditional electric arc furnace or converter, the yield can be improved by about more than 40%.

Claims (12)

1. A system for high-efficiency smelting of a double-furnace electric-converter is characterized by comprising a smelting furnace I (1), a smelting furnace II (2), an oxygen lance system I (3), an oxygen lance system II (4), an electrode system (5), a movable smoke hood system I (6), a movable smoke hood system II (7), an oxygen lance transverse moving trolley guide rail (8), an oxygen lance lifting trolley track I (9), an oxygen lance lifting trolley track II (10), a flue I (11), a flue II (12), a coal gas storage cabinet (13), a diffusing chimney I (14) and a diffusing chimney II (15); oxygen lance system (3) with oxygen lance sideslip platform truck guide rail (8) link to each other, oxygen lance system (3) operating condition with oxygen lance lift truck track one (9), activity petticoat pipe system (6) with smelting furnace one (1) link to each other, oxygen lance system two (4) operating condition with oxygen lance lift truck track two (10), activity petticoat pipe system two (7) with smelting furnace two (2) link to each other, activity petticoat pipe system (6) during operation partly with smelting furnace one (1) links to each other, another part with flue one (11) link to each other, flue one (11) with diffuse chimney one (14) and link to each other, activity petticoat pipe system two (7) during operation partly with smelting furnace two (2) link to each other, another part with flue two (12) link to each other, flue two (12) with diffuse chimney two (15) and link to each other, one end of the gas storage cabinet (13) is connected with the first flue (11), the other end of the gas storage cabinet (13) is connected with the second flue (12), the electrode system (5) rotates clockwise and is connected with the movable smoke hood system (6) and the smelting furnace I (1), and the electrode system (5) rotates anticlockwise and is connected with the movable smoke hood system II (7) and the smelting furnace II (2);
the system comprises a first oxygen lance system (3) and a second oxygen lance system (4), wherein the first oxygen lance system (3) comprises a first traversing trolley (3-1), a first lifting trolley (3-2) and a first oxygen lance (3-3), the second oxygen lance system (4) comprises a second traversing trolley (4-1), a second lifting trolley (4-2) and a second oxygen lance (4-3), the lifting capacity of the first lifting trolley (3-2) and the second lifting trolley (4-2) is 0-40t, and the outer diameters of the first oxygen lance (3-3) and the second oxygen lance (4-3) are 108 and 630 mm;
the electrode system (5) of the system comprises an electrode rotating lifting arm (5-1), an electrode supporting arm (5-2) and an electrode (5-3), wherein the clockwise and anticlockwise rotating angles of the electrode rotating lifting arm (5-1) are 0-90 degrees, the lifting height relative to the furnace bottoms of the smelting furnace I (1) and the smelting furnace II (2) is 0.5-50m, and the diameter of the electrode (5-3) is 100-1500 mm.
2. The system for high-efficiency smelting by a double-furnace electric-converter according to claim 1, characterized in that the steel output of the first smelting furnace (1) and the second smelting furnace (2) is 30-400t, and the ratio of the height to the diameter is 0.2-2.5.
3. The system for high-efficiency smelting of the double-furnace electric-converter according to claim 1, characterized in that the movable smoke hood system (6) of the system comprises a smoke hood driving device I (6-1), a movable smoke hood supporting arm (6-2), a movable smoke hood I (6-3), a pneumatic fast cutting device I (6-4) and a movable smoke hood outlet (6-5), the movable smoke hood system II (7) comprises a smoke hood driving device II (7-1), a movable smoke hood supporting arm II (7-2), a movable smoke hood II (7-3), a pneumatic fast cutting device II (7-4) and a movable smoke hood outlet II (7-5), the movable smoke hood I (6-3) and the movable smoke hood II (7-3) are respectively provided with 3 electrode jacks and 1 oxygen lance jack, the lifting height of the furnace mouth of the smelting furnace I (1) and the smelting furnace II (2) is 0-4 m.
4. The system for high-efficiency smelting by a double-furnace electric-converter as recited in claim 1, characterized in that said first flue (11) of the system comprises a first flue movable joint (11-1), said second flue (12) comprises a second flue movable joint (12-1), said first flue movable joint (11-1) and said second flue movable joint (12-1) have a diameter of 325 and 6000mm, a telescopic length of 0.5-10m, and said first flue (11) and said second flue (12) are equipped with a waste heat recovery system and a flue gas purification system.
5. The system for high-efficiency smelting by a double-furnace electric-converter as claimed in claim 1, wherein the volume of the gas storage cabinet (13) of the system is 2000-100000m3。
6. The process for the double-furnace electric-converter high-efficiency smelting of the double-furnace electric-converter high-efficiency smelting system according to claim 1, characterized in that the process loads metal materials with any scrap steel ratio into the smelting furnace I (1), drives a movable smoke hood supporting arm (6-2) to enable the movable smoke hood I (6-3) to be arranged above the smelting furnace I (1), an extension flue I movable connector (11-1) is connected with a movable smoke hood I outlet (6-5), uses a pneumatic fast cutting device I (6-4) to open 3 electrode jacks, rotates the electrode supporting arm (5-2) clockwise to enable the electrode (5-3) to be arranged right above the movable smoke hood I (6-3), descends the electrode (5-3) into the smelting furnace I (1), and starts to strike an arc to heat up the molten metal materials, after the smelting is finished, lifting an electrode (5-3), closing 3 electrode jacks by using a first pneumatic fast cutting device (6-4), loading a metal material with any scrap steel ratio into a second smelting furnace (2), driving a second movable smoke hood supporting arm (7-2) to enable the second movable smoke hood (7-3) to be arranged above the second smelting furnace (2), extending a second flue movable connector (12-1) to be connected with a second movable smoke hood outlet (7-5), opening 3 electrode jacks by using the second pneumatic fast cutting device (7-4), rotating the electrode supporting arm (5-2) anticlockwise to enable the electrode (5-3) to be arranged right above the second movable smoke hood (7-3), descending and transversely moving the electrode (5-3) to start heating the metal material, and simultaneously driving an oxygen lance system (3) to be unified (3) to be arranged above an oxygen lance lifting vehicle track I (9) by using the first trolley (3-1), and at the moment, a first pneumatic quick cutting device (6-4) is used for opening an oxygen lance insertion hole, the oxygen lance is lowered into a first smelting furnace (1) through a first lifting vehicle (3-2), oxygen blowing ignition is carried out, smelting operation is carried out, the first lifting vehicle (3-2) is lifted to a standby position after smelting requirements are met, steel is discharged, the operation process is circulated, double-furnace-body circular steel discharge is carried out, and the purpose of efficient smelting is achieved.
7. The process for high-efficiency smelting by using the double-furnace electric-converter according to claim 6 is characterized by comprising the following steps:
step 1: the method comprises the steps that scrap steel and molten iron metal materials are loaded into a first smelting furnace (1), a supporting arm (6-2) of a movable smoke hood is driven to enable the movable smoke hood (6-3) to be placed above the first smelting furnace (1), and a movable connector (11-1) of an extension flue is connected with an outlet (6-5) of the movable smoke hood;
step 2: opening 3 electrode jacks by using a first pneumatic quick cutting device (6-4), and rotating an electrode supporting arm (5-2) clockwise to enable an electrode (5-3) to be arranged right above a movable smoke hood (6-3); descending the electrode (5-3) into the smelting furnace I (1), starting arc striking, starting to heat up to melt metal materials, lifting the electrode (5-3) after the metal materials are dissolved, closing 3 electrode jacks by using a pneumatic fast cutting device I (6-4), and rotating the electrode (5-3) to a zero position;
and step 3: driving an oxygen lance system I (3) to be above an oxygen lance lifting car track I (9) by using a transverse trolley I (3-1), opening an oxygen lance insertion hole by using a pneumatic quick cutting device I (6-4), descending the oxygen lance into a smelting furnace I (1) through a lifting car I (3-2), blowing oxygen, igniting and carrying out smelting operation, lifting the lifting car I (3-2) to a standby position after the smelting requirement is met, and tapping;
and 4, step 4: when the electrode (5-3) is lifted in the step 2, metal materials with any scrap steel ratio are loaded into the second smelting furnace (2), the second movable smoke hood supporting arm (7-2) is driven to enable the second movable smoke hood (7-3) to be placed above the second smelting furnace (2), and the second elongated smoke hood movable connector (12-1) is connected with the second movable smoke hood outlet (7-5);
and 5: opening 3 electrode jacks by using a second pneumatic quick cutting device (7-4), rotating an electrode supporting arm (5-2) anticlockwise to enable an electrode (5-3) to be arranged right above the second movable smoke hood (7-3), and descending the electrode (5-3) to start heating the metal material;
step 6: and (5) the operation processes of the step (1) and the step (5) are circulated, so that the double-furnace body can discharge steel circularly, and the aim of efficient smelting is fulfilled.
8. The process of high-efficiency smelting by using the double-furnace electric-converter according to claim 6, wherein the furnace volume ratio of the first smelting furnace (1) to the second smelting furnace (2) is 0.7-1.8 m3/t。
9. The process for high-efficiency smelting by a double-furnace electric-converter according to claim 6, characterized in that the gas media of the oxygen lance system I (3) and the oxygen lance system II (4) is O2、N2、CO2Or a mixture of several gases, the gas flow range is 2000-95000Nm3Gas pressure range of 0.5-2.0MPa, gas consumption of 30-70Nm3/t。
10. The process for high-efficiency smelting by using the double-furnace electricity-converter according to claim 6, characterized in that the electrodes (5-3) in the electrode system (5) are three-phase alternating current electrodes, the electrode consumption is 0-3kg/t, the input power is 50-1500kVA/t, and the power consumption is 0-700 kWh/t.
11. The process for high-efficiency smelting by using the double-furnace electric-converter as claimed in claim 6, wherein the flue gas flow rate of the first flue (11) and the second flue (12) is 0-300000Nm3/h。
12. The process for high-efficiency smelting by using a double-furnace electric-converter according to claim 6, characterized in that the process and the system are suitable for smelting operation with the steel tapping amount of 30-400 t.
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