• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    This invention relates to the production of steel from iron oxide materials. The aim of the invention is to increase the efficiency of the process. The installation includes a shaft furnace for the production of sponge iron, which is connected to a melting gasifier and a converter. A part of the sponge iron is charged into the melter gasifier, which produces gas for the shaft furnace, and liquid iron is produced. Another part of the sponge iron is loaded into the converter, into which the liquid metal obtained in the cupola is supplied. As a gas for the production of molten metal in a cupola from scrap and coke, a mixture of gases from the shaft furnace, a smelter gasifier and a converter is used. The device provides buffer tanks for cast iron located between the converter, the cupola and the melter gasifier. The invention makes it possible to increase the economics of the process and completely utilize the waste gas. 2 sec. and 4 hp f-ly, 1 ill. Yo
    公开号:SU1743360A3
    申请号:SU874203138
    申请日:1987-08-11
    公开日:1992-06-23
    发明作者:Пюрингер Отмар；Валлнер Феликс；Визингер Хорст；Айхбергер Эрнст；Шиффер Вильхельм；Рокеншауб Вальтер
    申请人:Фоест-Альпине Индастриенлагенбау Гезельшафт М.Б.Х. (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to a metallurgical plant for the production of steel from ore and other solid iron carriers such as scrap, as well as to a method of operating such a metallurgical plant.
    In steel mills where steel is produced in steel purge converters by blowing from above and / or injecting oxygen into liquid iron, this iron is produced in blast furnaces using ores and high-value coke. Due to the fact that the production of pig iron in large blast furnaces is the most economical, the development goes towards blast furnaces with maximum productivity, which must be operated without interruption for as long as possible. When using this kind of blast furnace
    a steel plant must consume a large amount of pig iron, i.e. A large number of steel blow-through converters are also required with high productivity in order to process this cast iron. Accumulation of produced liquid iron is possible only conditionally. Pouring molten iron into pigs during breaks, respectively malfunctions, in the operation of a steel plant is uneconomical.
    In addition to liquid iron during the operation of converters, solid carriers of iron, mainly scrap, are also used as feed material. Without additional heat, i.e. if the refining process is to be autothermal, the scrap can be added only in limited quantities 4 C CJ CO O O
    WITH
    wah Depending on the prices of scrap and cast iron, it may be of interest to vary the scrap fraction in the loading material in order to keep the costs of loading material low.
    The possibility with respect to increasing the scrap fraction is to supply additional heat carriers in the form of fossil fuels to the feed material. It is well known in converters operating in the oxygen blowing mode from above, increasing the scrap fraction in the converter due to the fact that the scrap is preheated with an oxygen lance of the burner before its own refining process. Similarly, in the case of converters with bottom blowing, the supply of heat transfer fluid through bottom nozzles and partial additional combustion of gas formed in the converter and containing carbon monoxide above the feed material in order to increase the scrap fraction is known. However, such methods require an increase in the loading time and, thus, their effect is a decrease in productivity. As a result of the fuel supply, undesirable associated elements, such as sulfur, are also introduced into the process. In addition, large quantities of waste gas are generated, which should be directed to non-process related disposal.
    A method of producing steel from scrap is known, in which the waste gas arising from the refining of pig iron into steel and rich in carbon monoxide is supplied to the cupola loaded with scrap and coke, and in the nozzle zone the tuyeres of the cupola are burned during an exothermic reaction. The scrap is melted and carburized and the cast iron thus produced is supplied to the refining tank where it is refined to steel without further heat supply. Although in this method the energy consumption is relatively small, however, with regard to the choice of the ratio of iron and scrap it is It is inflexible because it comes exclusively from scrap as a base material. In addition, the price of scrap, depending on the respective economic situation, is subject to strong fluctuations.
    The purpose of the invention is to increase efficiency.
    The aim of the invention is to eliminate the shown shortcomings and difficulties and they are asked to present the metallurgical plant, as well as the method of its operation, with the help of which it is possible to manufacture high-purity steel from
    iron ore and other iron carriers, and economically and without large investments, liquid iron can be used, additional solid iron carriers can be used, the quantities of which can vary widely, all units can be flexibly coordinated in their performance with each other and also
    In the optimal way, the resulting waste gases can be used. This task is solved by a combination of a direct reduction plant, in particular a direct reduction blast furnace for
    5 of production of sponge iron with a smelting gasifier, one or several steel blowing converters and a cupola, the installation of direct recovery from the discharge side through
    0 sponge transport devices are in conjunction with both the melter gasifier and converters, the cupola through the liquid metal transport devices for
    5 of the subsequent processing is in conjunction with converters and the melting gasifier through the transport devices for liquid iron is in conjunction with converters.
    0 Buffer tanks are provided.
    pig iron from a melter gasifier and for metal for subsequent redistribution from a cupola.
    According to a special form
    5, the exhaust gas pipelines of the direct reduction plant and the melter gasifier as well as the exhaust gas pipeline of the steel-steel converter are connected
    0 pipeline.
    The method of operation of the metallurgical plant is that the piece oxide iron carriers are placed in the reduction zone of the installation of direct
    5 reduction and reduction due to the reducing gas produced in the melting gasifier from coal and oxygen-containing gas, part of the reduced product - sponge iron - in
    0, the hot state is introduced into the melting zone of the melter gasifier, heat, liquefy and carbonize is heated there, and liquid iron 1 is obtained, the other part of it is locked from the direct
    5, and in the form of solid feed material, are loaded into the purge (s) steel (s) converter (s), scrap together with coke are loaded into the cupola and liquefied to form metal for subsequent conversion, liquid iron from the melter gasifier with metal for the subsequent redistribution from the cupola is loaded into the purge (s) steel (s) converter (s) and refined; moreover, the off-gas from the direct reduction plant, the gas from the melter gasifier and the waste-gas are used as fuel for the cupola; s from steel purge converters, respectively, a mixture of these gases.
    Compared to conventional metallurgical plants using a blast furnace as a cast iron producer, the plant has the advantage that it can be started and stopped without problems and that with regard to the feed material used for steel production, there are variations over a wide range.
    The drawing is a block diagram of the proposed installation.
    A direct reduction unit 1, preferably a reducing domain furnace, is loaded with piece ore from a charging device 2. A domain furnace is connected to a melter gasifier 3, in which a reducing gas is produced from coal and oxygen-containing gas, which is fed through pipe 4 to a reduction blast furnace.
    In the blast furnace, the piece ore is reduced to sponge iron 5. Sponge iron is partially supplied to the smelter gasifier and melted in the melting zone to form pig iron 6. Molten iron is collected in buffer tank 7. for example, a tubular ladle.
    The installation includes a steel purge converter 8, made in the form of a converter with oxygen blowing from the top and working with an oxygen spear 9 introduced into the converter 9. The converter is loaded with liquid iron from the buffer tank 7, for example, using transporting buckets 10. A portion of the converter charge is the sponge iron that is removed from the blast furnace using the transport device 11, the other part is the liquid metal supplied through the ladles 12.
    In the cupola 13, solid iron carriers 14 are fused, preferably scrap. with carbon carriers 15 and liquefy them. The heat required for this is obtained from a reducing gas (conduit 16), an upper gas (conduit 17), from a converter off-gas or a mixture of these gases. The converter off-gas can be discharged through line 18 and collected in gas tank 19.
    The liquid metal obtained in the cupola 13 for further processing 20 is collected in the buffer tank 21 and led to the steel purge converter 8 through the transport buckets 12.
    It is also possible to use only a single tank instead of the two buffer tanks 7 and 21, and a mixed metal chargeable material is obtained from the iron of the melting gasifier and metal for the subsequent redistribution of the cupola.
    A typical example of the implementation of the method when using a 40-tonne conter with oxygen blowing from the top is as follows.
    Out of 62.9 tons of ore / h with a composition of 93.17% Re203, 0.02% S, 0.14% CO2, 1.03% CaO, 0.07% MpO, 2.84% SiC2, 0.08% MgO, 0.67%
    0, 0.03% P 20s and 0.80% of the remaining components in a direct reduction blast furnace using a reducing gas with a composition of 64.15% CO, 1.86 CO2, 0.03% CH4, 27.7% H2 , 1.68%
    5 H20, 0.35% N2 and 0.24% H2S produced 45.5 t / h of sponge iron with a composition of 89.0% Fe, 1.0% CaO, 3.9% Si02, 0.1% Mpo, 1.0%, 0.04% P, 0.08% S, and 4.0% total carbon (1.5% RechO 2.5% elemental carbon).
    A part of this iron, namely, 29.3 t / h is supplied to the melting gasifier with simultaneous supply of 36.1 tons of coal and 23251 Nm3 / h of oxygen, a, 16.2 tons / h of sponge
    5 iron leads to the converter. In a melter gasifier, cast iron is obtained in an amount of 27.8 t / h with a composition of 4.1% C, 1.0% Si, 0.07% Mn, 0.05% P and 0.03% $ 2 (the rest of iron), which accumulate in the buffer
    0 tanks 7 and batches are fed to the converter.
    In the cupola of 29.3 t / h scrap with the composition
    0.15% C, 0.20% Si, 0.3% Mn, less than 0.2% P,
    less than 0.2% S, the rest is iron and from 1.3 t / h
    coke smelted 27.8 t / h of metal for po5 the next conversion with the composition of 3.6% C. 0.1% Si, 0 2% Mn, 0.02% P, 0.05% S, the rest iron at a temperature of 1400 ° s This metal is accumulated in the buffer tank 21 for subsequent processing, and after
    0 those batches are fed to the converter. The converter has a capacity of 63.3 t / h, refined steel has a composition of 0.04% C 0.1 Mp, less than 0.02% P, less than 0.025% S and the rest of iron and a temperature of 1650 ° C.
    5 For the smelting of metal for subsequent reprocessing in the cupola, top blast furnace direct reduction gas is used, namely, 13070 Nm3 / h of gas under a pressure of 4.4 bar is required. Excessive amounts of top gas, occurring in approximately four times the volume compared to what is needed for the operation of the cupola, may be supplied to other consumers.
    权利要求:
    Claims (4)
    [1]
    1. A plant for the continuous production of steel, containing a shaft furnace for the production of sponge iron, bound
    a gas melting gasifier with a gas pipeline, which has coal and oxygen-containing gas supply units, and is connected to at least one purge converter, which, in turn, is connected to the shaft furnace of the cupola, connecting pipelines, transport units and exhaust gas pipelines, which with that. that, in order to increase the efficiency, the shaft furnace is connected by means of transporting units to the melting gasifier, and the converter is connected to the cupola.
    [2]
    2. The installation according to claim 1, in connection with the fact that it is provided with buffer tanks for cast iron located between
    converter and cupola and between the converter and the melter gasifier.
    [3]
    3. Installation of pop, 1, characterized in that the pipelines of the exhaust gas of the shaft furnace, the melter gasifier and the converter are connected to the cupola.
    [4]
    4. A method of continuous steel production, including the reduction of iron oxide materials to sponge iron by gas obtained in a melting gasifier by supplying coal and oxygen-containing gas to the melt, loading scrap together with coke into the cupola, melting it by supplying heated gas, loading part of the recovered iron sponge and obtained in a melter gasifier and a liquid metal cupola to a converter, purge and refining, characterized in that, in order to increase efficiency, another part of bchatogo iron is charged into the melter gasifier, and as the heated gas supplied to the cupola furnace, a mixture of the gases exiting from the shaft furnace, melting gasifier and a converter.
     U5
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    同族专利:
    公开号 | 公开日
    AU7617787A|1988-02-18|
    AU599123B2|1990-07-12|
    CA1333336C|1994-12-06|
    AT51033T|1990-03-15|
    MD61B1|1994-08-31|
    MD61C2|1994-11-30|
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    ZA875914B|1988-02-15|
    US4804408A|1989-02-14|
    DD261379A5|1988-10-26|
    JP2690733B2|1997-12-17|
    EP0257173A1|1988-03-02|
    DE3669535D1|1990-04-19|
    BR8704134A|1988-04-12|
    KR940008926B1|1994-09-28|
    UA12653A|1997-02-28|
    KR880003014A|1988-05-13|
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    引用文献:
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    AT409634B|2000-05-15|2002-09-25|Voest Alpine Ind Anlagen|METHOD AND DEVICE FOR THE PRODUCTION OF RAW IRON OR LIQUID STEEL PRE-PRODUCTS FROM IRON-CONTAINING MATERIALS|
    KR100931229B1|2002-12-23|2009-12-10|주식회사 포스코|Combined steelmaking equipment and method using reduction furnace and electric furnace|
    WO2006110949A1|2005-04-18|2006-10-26|Technological Resources Pty. Limited|Hot metal supply apparatus|
    AT506837B1|2008-06-06|2010-03-15|Siemens Vai Metals Tech Gmbh|METHOD AND DEVICE FOR PRODUCING RAW STEEL OR LIQUID STEEL PREPARATIONS|
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    EP19860890229|EP0257173B1|1986-08-12|1986-08-12|Metallurgical plant and method of operating the same|MD94-0105A| MD61C2|1986-08-12|1994-02-15|Installation for steel continuous obtaining and process for steel continuous production|
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