• 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:
    A method of controlling independently of each other the stirring strength of a jet of oxygen gas and the flow rate of the oxygen gas to be blown onto a molten metal bath in a top-blowing oxygen furnace by detecting and controlling the temperature and the pressure of the oxygen supplied.
    公开号:SU1695828A3
    申请号:SU864028564
    申请日:1986-11-25
    公开日:1991-11-30
    发明作者:Сугимори Такаси；Фуруе Сакае
    申请人:Сумитомо Метал Индастриз, Лтд (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to methods for melt blowing with regulation of the mixing force of a gas jet, such as oxygen, as well as gas flow rates, independently of one another in a top blown converter for steel production, a top blow furnace for copper production, a top blow furnace for gasification coal and other similar, each of which has a molten metal bath
    The purpose of the invention is to increase the efficiency of the purge.
    The drawing shows a diagram of an oxygen furnace with a top blast.
    A top blown oxygen gasification converter or furnace 1 is provided with a tuyere 2 for a top oxygen blowing and has a mechanism 3 for sealing the tuyere. The gaseous oxygen is supplied to the lance 2 through the pipeline 4 for supplying the gaseous oxygen through the heat exchanger 5. A thermometer 6 and a pressure measuring device 7 are installed on the pipe 4.
    Oxygen gas is supplied through an oxygen gas supply pipe 4 to the oxygen lance 2 through heat exchanger 5, and it is blown onto the surface of the molten metal bath. During the process, the position or level of the oxygen tuyere 2 is fixed in order to maintain a constant distance between the tip of the tuyere and the surface of the molten metal bath.
    When it is required to further reduce the carbon content in the final stage of refining low carbon steel, it is necessary to reduce the flow rate of gaseous oxygen while increasing the stirring power of the molten metal bath. In this case, increase the pressure of gaseous oxygen to increase the mixing power of gaseous oxygen, and increase the temperature of the gaseous oxygen with heat exchanger 5 so as to maintain or reduce the flow rate of gaseous oxygen Yes. On the other hand, at the initial stage of steel refining, it is necessary to increase the flow rate of gaseous oxygen, maintaining its mixing force at a given level. In this case, the temperature of the oxygen gas supplied is reduced by means of the heat exchanger 5, while its pressure is kept constant.
    Thus, the supply of oxygen gas is controlled by adjusting its temperature regardless of pressure and regardless of the strength of mixing.
    When it is required to increase the stirring force of the jet of gaseous oxygen without changing the supply of gaseous oxygen, not only the pressure of the gaseous oxygen is raised, but also its temperature is raised. In addition, when it is required to reduce the mixing force of a jet of gaseous oxygen without altering the supply of gaseous oxygen, not only the pressure of the gaseous oxygen is reduced, but also its temperature. . Therefore, it is possible to increase the moment of a jet of gaseous oxygen while maintaining a constant flow rate of gaseous oxygen by setting the pressure of gaseous oxygen, as well as its temperature.
    The temperature of the oxygen gas is restored using heat exchanger 5 on the basis of data measured by thermometer 6. In addition, in cases where oxygen pressure is to be established, such installation is carried out using a control valve based on data measured by pressure measurement device 7 ,
    Example. The method is carried out using a gasification furnace containing a molten metal bath. The results of coal gasification experiments using the proposed method are compared in Table. 1 and 2 with the results obtained using a known method.
    In the case of a gasification furnace containing a molten iron bath, coal is blown through the upper lance to blow a molten iron bath along with oxygen gas in order to gasify the coal. The lance 2 of the upper blowing is fixed at a predetermined height.
    In tab. Figure 1 shows the test results for the case when the supply of oxygen gas decreases or increases while the mixing force of the stream of oxygen gas is kept constant. Table 2 shows the case in which the mixing force
    0 increases or decreases while maintaining a constant supply of gaseous oxygen.
    As it is obvious from the results given in table. 1, when the entrance is coal and feed
    5, the gaseous oxygen decreases or increases by about 20%, it is necessary not only to reduce the supply of gaseous oxygen, but also to change the height of the tuyere, although the mixing force
    0 jets of gaseous oxygen must be maintained at a constant level.
    It is possible to maintain a constant height of the tuyere only by raising the temperature of the gaseous oxygen, while the supply of gaseous oxygen decreases or increases while maintaining a constant concentration of C02 in the generated gas.
    The data table. 2 illustrates that case when it is necessary to decrease or increase the concentration of C02, i.e. it is required to increase or decrease the CO content in the produced gas. It is necessary to increase or decrease the force of mixing of the jet.
    5 gaseous oxygen while maintaining a constant supply of gaseous oxygen.
    In such a situation it was not necessary to change the height of the tuyere so as to change the concentration of COz. However, in accordance with the proposed method, it is possible to reduce or increase the concentration of C02 in the produced gas only by raising or lowering the temperature of the gaseous
    5 oxygen without changing the height of the tuyere while maintaining the supply of gaseous oxygen at a constant level.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    0 A method of purging a melt in a furnace, including purging the melt with oxygen from above through the tuyere, measuring the temperature at the entrance to the tuyere, regulating the oxygen pressure using a valve and
    5 changes in the purge mode with a constant position of the tuyere, characterized in that, in order to increase the efficiency of the purge, the oxygen pressure is additionally measured before being fed into the tuyere and the stirring force and / or speed is controlled
    The jets of oxygen are independent of each other; the mixing force is controlled by changing the pressure of oxygen and its temperature before being fed into the lance, and the speed of the jet is controlled by changing the temperature at constant pressure of oxygen.
     The flow rate of gaseous oxygen increases. The flow rate of gaseous oxygen decreases.
     Stirring force is reduced. Stirring force is increased.
    Table 1
    table 2
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    同族专利:
    公开号 | 公开日
    JPS62202014A|1987-09-05|
    EP0227952B1|1989-11-08|
    EP0227952A1|1987-07-08|
    US4732607A|1988-03-22|
    IN168857B|1991-06-29|
    DE3666842D1|1989-12-14|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3540879A|1967-06-27|1970-11-17|Westinghouse Electric Corp|Method for controlling phosphorus removal in a basic oxygen furnace|
    US3598386A|1967-10-09|1971-08-10|Crucible Steel Co America|Apparatus for making steel|
    US3871871A|1967-12-11|1975-03-18|Centre Nat Rech Metall|Monitoring and control of pig iron refining|
    DE2114600B2|1971-03-25|1981-05-07|Vacmetal Gesellschaft für Vakuum-Metallurgie mbH, 4600 Dortmund|Process for targeted vacuum decarburization of high-alloy steels|
    DE2702138A1|1977-01-20|1978-07-27|Kloeckner Humboldt Deutz Ag|Refining of molten copper - where mixt. of oxygen and fuel is blown at high velocity onto surface of molten bath|
    GB2088892B|1980-12-01|1984-09-05|Sumitomo Metal Ind|Process for gasification of solid carbonaceous material|EP0377597A1|1987-08-24|1990-07-18|MANNESMANN Aktiengesellschaft|Process and device for minimizing process gas consumption in metallurgical processes|
    CH675088A5|1987-12-24|1990-08-31|Stopinc Ag|
    DE19501871A1|1995-01-23|1996-07-25|Linde Ag|Process for treating molten metals with a treatment gas|
    US6599464B1|1999-10-06|2003-07-29|Bernd Feldhaus|Steelmaking lance with integral temperature probe|
    DE19948187C2|1999-10-06|2001-08-09|Thyssenkrupp Stahl Ag|Process for the metallurgical treatment of a molten steel in a converter with oxygen blown onto the molten steel and oxygen blowing lance|
    CN101956041B|2010-09-28|2013-06-26|莱芜钢铁集团有限公司|Converter oxygen-blowing control method and device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP26578285|1985-11-26|
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