• 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:

    公开号:SU1366067A3
    申请号:SU843725403
    申请日:1984-04-11
    公开日:1988-01-07
    发明作者:Karl Byuler
    申请人:Bbc Brown Boveri & Cie；
    IPC主号:
    专利说明:

    The invention relates to a method for cooling bath walls of metallurgical furnaces, in particular electric arc furnaces, using a liquid cooled device. The purpose of the invention to increase the service life of the furnace by preventing the ingress of coolant inside the furnace and ensure safety. Coolant is directed from top to bottom so that the hydrostatic differential pressure supports the circulation of coolant. Before entering the cooler ". £ 5
    This element reduces the fluid pressure and sets a pressure not exceeding 0.9 bar. 2 Il.
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    The invention relates to a method of cooling the walls of a bath of metallurgical furnaces, in particular electric arc furnaces, using a device cooled by a liquid consisting of at least one cooling element.
    The purpose of the invention is to increase the service life of the furnace by preventing the coolant from entering the interior of the furnace and ensuring operational safety.
    The pressure in the water in the cooling elements located in the threatened 15 zones of the furnace bath with high intensity of thermal radiation in no place exceeds the pressure of the surrounding atmosphere (0.9 bar). Thus, with absolute reliability 20, water, or water vapor, is prevented from entering the interior of the furnace bath. Coolant is directed from top to bottom so that the hydrostatic pressure difference maintains the circulation of coolant.
    This provides the advantage that the hydrostatic level can be used as an additionally available pressure differential. The pressure reducing valve used is a manually operated pressure reducing diaphragm valve. When the cooling system is put into operation by means of manual control, air can be removed from it, and the system of reduced pressure in the cooling elements can completely, i.e. without any 40 residual gas bubbles, fill with water.
    Figure 1 presents a schematic diagram of a cooling system that implements the proposed method; on 45 of Fig. 2 - a manually controlled diaphragm valve for reducing pressure, vertical section.
    The cooling fluid, mainly water, is supplied from the collection tank 1θ 1 with the help of a feed pump 2 with sufficient overpressure to the pressure reducing valve 3. This ensures that the coolant is supplied reliably depending on the static level. The pressure reducing valve 3 reduces the available pressure to the desired maximum allowable pressure in the coolant when entering the cooling elements 4. This inlet pressure in the coolant is less than the ambient atmospheric pressure, for example 0.9 bar.
    In the cooling circulation loop, two hose-like cooling elements 4 with a vertical axis are connected in parallel. However, without additional measures, it is also possible to make the cooling elements 4 have any other form of implementation, for example, that the cooling elements 4 pass horizontally. More than two cooling elements 4 can also be designed for one circulation circuit.
    For the smooth operation of the cooling system, it is necessary that the cooling fluid in all cooling elements 4 connected in parallel in one circulation circuit is fed from the distribution point 5. This ensures that all cooling elements 4 connected in parallel in the cooling circulation circuit are at one. and the same inlet pressure. A water pump 6 is located on the outlet side of the cooling elements 4. This pump can be, for example, a centrifugal pump and provides suction of the cooling fluid, due to which the reduced pressure in the cooling elements 4 decreases even more, for example, to 0.5 bar. The pump 5 is made in the form of both a suction pump and a pressure pump and delivers coolant to the collection tank 1. Pump 6 could also act only as a suction pump, and in addition to it, the next pump, which then works as a pressure pump and supplies a cooling liquid in the collection tank 1. Due to the elements of the installation located at different levels -. valve 3 reduce pressure at the top level and the pump at the bottom level - is achieved by taking into account the pressure difference resulting from the hydrostatic
    pressure (level difference) and hydraulic resistance of the cooling '
    elements 4, pressure in cooling
    3
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    elements in any place does not exceed the pressure of the surrounding atmosphere.
    Since the cooling elements are located in the thermally heavily loaded areas of the furnace bath walls inward-facing the furnace, it is ensured that in the event of a leak in a liquid-cooled device, the coolant cannot enter the furnace space and, conversely, the gas from the furnace space is sucked into the cooling elements 4.
    The vertical arrangement of the cooling elements 4 is preferable, since due to the fact that the coolant flows in the upper part of the cooling elements 4, gradually flows down through them and flows out in the lower part of the cooling elements 4, the hydrostatic level of the cooling elements 4 can be used as an additional pressure difference to overcome resistance to fluid flow. After the pump 6, the gas separation device 7 is placed.
    The gas, directed together with the coolant, is separated in the device 7 and supplied to a gas detection device 8 connected to the gas separation device 7. The amount of gas produced in the gas separation device 7 per unit of time is determined using a detection device 8. Based on the values exceeded by the registered quantities of gas the time of certain boundary values can be immediately installed arising in extreme cases, the leakage in the cooling elements 4.
    (This leakage is reported using an optical or acoustic signal and the furnace is turned off. The detecting device 8 can also be directly connected to an adjusting device (not shown), whereby the operation of the furnace stops automatically.
    The design of the cooling circuit is also applicable to a larger number of separate cooling circuits, with each cooling circuit having at least one cooling element 4 and for one valve 3 reducing
    pressure is designed at least one cooling circuit 4.
    It may be that more than two cooling circuits are designed for the same pressure reducing valve 3, especially when the inputs to the cooling circuits are approximately at the same height.
    In another embodiment of the cooling system, only a single suction pump can have a larger number of cooling circulation circuits.
    In order to set or regulate the amount of water flowing through the individual cooling circuits, for example, flow meters, actuators or control valves can be used.
    Figure 2 shows a manually controlled pressure reducing membrane valve. It consists mainly of the following elements: an inlet pipe 9 of increased pressure, an outlet pipe 10 of reduced pressure located perpendicular to the inlet pipe 9 of increased pressure, and the inner pipe 11 fixedly connected to it, the case casing 12 and the bellows membrane 13. On the case casing The mounting flange is located.
    The valve depicted in FIG. 2 is a pressure differential valve which reduces the pressure in the section from the supply pipe of the increased pressure to the outlet pipe of the reduced pressure to a value that remains the same with respect to the atmospheric pressure. Increased pressure present in the cavity 14 of the increased pressure acts on the valve plate 15, which closes the upper opening of the inner pipe 11 with the help of the spring 16, as well as on the membrane plate 17. The valve plate 15 is mechanically fixed mechanically through a rod 18 mounted in the guide sleeve 19 with the membrane 13 and the membrane plate 17. With this design, the rod 18 is hydraulically loaded on both sides, i.e. pressure on the valve plate 15 And the membrane plate 17 compensate5
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    so that an almost constant difference between atmospheric pressure and reduced pressure is automatically established.
    However, a centrifugal pump 6 (FIG. 2) operating as a suction pump can produce the desired reduced pressure only when it is mainly filled with coolant. Therefore, when the liquid cooled device starts up, the diaphragm plate 17 of the pressure reducing diaphragm valve is activated, and the underpressure cavity 14–15 and the underpressure cavity are briefly interlocked. After that, the valve automatically works again.
    权利要求:
    Claims (1)
    [1]
    Claim
    The method of cooling the walls of a metallurgical furnace, for example, an electric arc including the supply of a pressure cooler from top to bottom through a cooling element installed in the furnace wall, characterized in that, in order to increase the service life of the furnace by preventing the coolant from getting inside the furnace and ensuring safety of operation, liquids are reduced before entering the cooling element and set therein a coolant pressure not exceeding 0.9 bar.
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    同族专利:
    公开号 | 公开日
    EP0123168A1|1984-10-31|
    US4603423A|1986-07-29|
    BR8401670A|1984-11-20|
    JPS59205581A|1984-11-21|
    EP0123168B1|1987-03-18|
    AT26015T|1987-04-15|
    DE3462711D1|1987-04-23|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1035050A|1912-02-21|1912-08-06|George J Rennie|Cleaning device for water-cooled-wall furnaces.|
    US1030792A|1912-02-29|1912-06-25|Frank C Roberts|Furnace-cooling.|
    GB958493A|1960-05-04|1964-05-21|Nippon Telegraph & Telephone|Improvements in or relating to arc furnaces|
    FR1557637A|1967-05-29|1969-02-21|
    US3612501A|1969-09-29|1971-10-12|Anderson Constr Corp A E|Furnace-cooling apparatus|
    GB1488563A|1974-05-20|1977-10-12|Nippon Kokan Kk|Evaporative cooling method using natural circulation of cooling water|
    US3966179A|1974-07-18|1976-06-29|Sergei Mikhailovich Andoniev|Apparatus for evaporative cooling of metallurgical plants|
    DE2651593C2|1976-11-12|1978-09-28|Fried. Krupp Huettenwerke Ag, 4630 Bochum|Measuring device for foreign gas contained in the water vapor of the cooling system of an industrial furnace, in particular a blast furnace|
    US4274967A|1978-07-07|1981-06-23|Technicon Instruments Corporation|Chromatographic apparatus and method|
    FR2449125B1|1979-02-16|1983-01-28|Inst Ochistke T|
    EP0088439B1|1982-03-10|1986-08-13|Hitachi, Ltd.|Gas chromatographic apparatus|JP2511259B2|1986-12-27|1996-06-26|株式会社ディスコ|Wafer cooling method for semiconductor heat treatment apparatus|
    LU90693B1|2000-12-11|2002-06-12|Wurth Paul Sa|Kuehlsystem fuer einen metallurgischen Schmelzofen|
    CN100458340C|2002-11-28|2009-02-04|侯松发|Electric arc furnace with cooling water circulating system|
    EP2693143A1|2012-08-01|2014-02-05|Siemens VAI Metals Technologies GmbH|Method and device for detecting a leak in the area of at least one cooling device of a furnace, and a furnace|
    CN104154746B|2014-09-02|2015-09-23|山东亨圆铜业有限公司|Smelting furnace manufactures pans slag heater|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CH195783|1983-04-12|
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