Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B22—CASTING; POWDER METALLURGY
  • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
  • B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
  • B22D41/005—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like with heating or cooling means
  • B22D41/01—Heating means
  • B22D41/015—Heating means with external heating, i.e. the heat source not being a part of the ladle
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
  • F23D14/12—Radiant burners
  • F23D14/16—Radiant burners using permeable blocks
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D91/00—Burners specially adapted for specific applications, not otherwise provided for
  • F23D91/02—Burners specially adapted for specific applications, not otherwise provided for for use in particular heating operations
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2203/00—Gaseous fuel burners
  • F23D2203/10—Flame diffusing means
  • F23D2203/101—Flame diffusing means characterised by surface shape
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2203/00—Gaseous fuel burners
  • F23D2203/10—Flame diffusing means
  • F23D2203/101—Flame diffusing means characterised by surface shape
  • F23D2203/1012—Flame diffusing means characterised by surface shape tubular
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2203/00—Gaseous fuel burners
  • F23D2203/10—Flame diffusing means
  • F23D2203/101—Flame diffusing means characterised by surface shape
  • F23D2203/1017—Flame diffusing means characterised by surface shape curved
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
  • F23D—BURNERS
  • F23D2203/00—Gaseous fuel burners
  • F23D2203/10—Flame diffusing means
  • F23D2203/105—Porous plates

Definitions

• the invention relates to a heating device for preheating a liquid metal transporting in melting operations container, such as a transport ladle, which is lined with refractory material, wherein the container is heated in a container closure lid having a heating stand.
• the molten metal is transported in the liquid state by means of pans from one stage of the production of metal products to the next stage.
• the pan must not be cold before filling with the liquid metal. This requirement results essentially from the fact that on the one hand the filled liquid metal may lose only minimal energy due to heat losses to the pan.
• the refractory lining is sensitive to a sudden heat load after filling with metal, resulting in a high consumption of refractory material. The aim is therefore to keep the temperature difference between the Pfannenausmautation and the liquid metal as small as possible.
• the transport pans for the liquid metal are preheated or kept warm by burners prior to use in heating stands, as has become known, for example, from EP 1 078 704 B1.
• the air-fired natural gas burners used have a power of up to 4 MW and produce a flame which causes the exhaust gas to move quickly, tend to form streaks and has only a relatively low proportion of radiant energy.
• the invention is therefore an object of the invention to provide a heater of the generic type without these disadvantages, thus better energy use and a reduction in CO2 emissions and the consumption of refractory material or lining material to achieve.
• pore burners for heating and keeping the container warm, in particular a transport pan.
• WO 2004/092646 A1 known pore burners for preheating or keeping warm liquid metal transport containers thus the more efficient combustion of the energy carrier in the pore burner is used for this heating task.
• This reduces the amount of exhaust gas and nevertheless produces an exhaust gas with a spatially uniform temperature and exit velocity, with which stratification can be avoided.
• a relatively high proportion of energy used is converted into radiant energy in the pore burner. Overall, this allows an economical, effective use of energy with reduced CO2 emissions and a faster heating of the container with a uniform heating of the refractory material or the lining of the container can be achieved.
• a preferred embodiment of the invention provides that the pore burners are constructed and arranged like a field.
• the construction of pore burner fields allows optimized use of pore burners.
• space-distributed distributed on the inner wall of the closure lid trained fields of pore burners provided.
• An advantageous alternative embodiment provides that a projecting through the closure cap into the container column is provided with space-optimized distributed fields of pore burners.
• the hot exhaust gas enters the heating space at a relatively low speed, has a uniform temperature distribution in the cross-sectional exit, and does not cause stratification.
• a high proportion of energy in the pore burner is converted into radiation, wherein the radiation temperature is higher than the required temperature (1100 to 1200 0 C) of the refractory material of the liquid metal transport container.
• the heating and holding device with a projecting into the interior of the container to be heated column provides an advantageous embodiment that the pore burners are distributed over the entire circumference of the column.
• the laterally and optionally from below equipped with pore burner fields column can achieve an even more effective effect of the radiation.
• the column is preferably polygonal, it is possible to favor the formation of pore burner fields on the pillar by attaching the pore burners in a simple manner to the planar polygonal surfaces.
• the column is associated with a lifting device.
• the thus possible raising or lowering allows a variable, adaptable to the respective heating task positioning of the heating column.
• the column is also preferably rotatable about its longitudinal axis, in an advantageous manner by the simultaneously rotatable lifting device, even more uniform heating or heating of the lining of the liquid metal transport container can be achieved.
• FIG. 1 shows, as a detail of a heating station for preheating and keeping warm a liquid metal transport container, the container closed by a lid equipped with pore burners, shown schematically;
• FIG. 2 shows a very schematic view of the closure lid according to FIG. 2 in a view from the inside;
• Figure 3 is a schematic representation as shown in Figure 1, in contrast, with trained on a projecting through the cap in the transport container pillar fields of pore burners.
• a heating device 5 is provided on the inner wall 6 of the closure lid 2.
• this consists of a plurality of pore burners 7, which are constructed as fields 8 and are mounted on the inside of the closure lid 2 in optimum space utilization.
• the pore burners 7, which are connected to an energy and oxygen carrier source via supply lines, not shown, generate a hot, indicated by arrows exhaust 9, which enters the container interior at a relatively low speed, a uniform temperature distribution in the cross-sectional outlet of the fields 8 of the pore burner. 7 and does not cause streaking.
• a high Proportion of energy converted to radiation as illustrated by arrows 10.
• the exhaust gas 9 is discharged through slits 11 to be closed openings in the bottom of the liquid metal transport container 3.
• the heating device 50 is provided on a column 12 protruding through the closure lid 20 into the liquid metal transport container 3.
• This is formed polygonal (see Fig .. 4), and in turn distributed in space-distributed fields 8 existing pore burner 7 are mounted on the polygonal surfaces in a column 12 fully enclosing manner.
• the exhaust gases 9 and the radiation 10 are here directed radially directly on the refractory material 4, wherein the exhaust gases 9 can then flow out again via the controllable by slide 11 bottom openings or be dissipated.
• the column 12 can be lowered or raised by a lifting device 15 for optimized positioning of the heating device 50 in accordance with the respective heating task and can be rotated about its longitudinal axis to even out the preheating or keeping the refractory material 4 warm as illustrated by the rotation arrow 16.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Chemical & Material Sciences (AREA)
• Combustion & Propulsion (AREA)
• General Engineering & Computer Science (AREA)
• Casting Support Devices, Ladles, And Melt Control Thereby (AREA)
• Furnace Housings, Linings, Walls, And Ceilings (AREA)
• Vertical, Hearth, Or Arc Furnaces (AREA)
• Combustion Of Fluid Fuel (AREA)
• Treatment Of Steel In Its Molten State (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=38622460

Family Applications (1)

Country Status (9)

Families Citing this family (10)

Family Cites Families (17)

• 2007
  • 2007-05-11 KR KR1020087025992A patent/KR101077517B1/ko not_active IP Right Cessation
  • 2007-05-11 CN CN2007800174105A patent/CN101443145B/zh not_active Expired - Fee Related
  • 2007-05-11 RU RU2008149523/02A patent/RU2433886C2/ru not_active IP Right Cessation
  • 2007-05-11 JP JP2009510329A patent/JP4959786B2/ja not_active Expired - Fee Related
  • 2007-05-11 WO PCT/EP2007/004195 patent/WO2007131721A1/de active Application Filing
  • 2007-05-11 EP EP07725115A patent/EP2026922A1/de not_active Withdrawn
  • 2007-05-11 US US12/227,326 patent/US8357327B2/en not_active Expired - Fee Related
  • 2007-05-11 DE DE102007022684A patent/DE102007022684A1/de not_active Withdrawn
  • 2007-05-11 CA CA2652034A patent/CA2652034C/en not_active Expired - Fee Related

Non-Patent Citations (1)

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