In the case shown, the electrode 11 functions as a cathode, it has a graphite pop over to this site 11a above and a metallic part 11b below which also functions as a bearing element associated with its own means 12 to grip the electrode-bearing arm. The residual carbon content of the bricks ranges from 10 % to 14 go to my site At the present time the maximum economical size for a single graphite electrode DC furnace appears to be around 165 tons. According to the invention, the heat developed inside the furnace causes the metal contained inside the hollow 14 and the circuit 20 to melt, in the event that this metal is in its solid state at ambient temperature.
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getElementById( “ak_js_1” ). In some twin-shell furnaces, the scrap is charged into the second shell while the first is being melted down, and pre-heated with off-gas from the active shell. These furnaces have a taphole that passes vertically through the hearth and shell, and is set off-centre in the narrow “nose” of the egg-shaped hearth. The system according to the invention also makes it possible to make the temperature you can try these out the joint uniform and maintain it within the appropriate values, this in order to guarantee the mechanical stability of the connection between the graphite part and the metallic part; this stability moreover is increased as a result of the interstices between the walls of the joint being filled. (с) 2020 ETS ENGINEERING LTDPrivacy policy Your Name (require)
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Such a furnace is known as a submerged arc furnace, because the electrode tips are buried in the slag/charge, and arcing occurs through the slag, between the matte and the electrode. According to a variant, on the separator element there are mounted laminar diaphragms made of a highly electroconductive material (for example copper) arranged substantially parallel to the axis of the electrode. This element, which is passed through by the electric current, melts and thus increases in volume; it rises up the joint and positions itself between the two parts of the joint itself, thus improving the mechanical connection and the passage of the current. Once the electrodes have reached the heavy melt at the base of the furnace and the arcs are shielded by the scrap, the voltage can be increased and the electrodes raised slightly, lengthening the arcs and increasing power to the melt.
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The billet is inserted into a copper housing through which cooling water is circulated. A few types of the bottom connections for DC-EAF are shown in Fig 6. Fig 3 Different types of bottom anode configurationsIn the case of current conducting refractory contact, the refractory lining at the centre of the furnace bottom acts as the anode. About YounengdeAnyang Younengde Electric Co. Each thyristors can, in principle, be turned off within half a cycle.
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According to a variant, the metal is already in its liquid state at ambient temperature. C. Separate from the furnace structure is the electrode support and electrical system, and the tilting platform on which the furnace rests. Each sector consists of a horizontal ground plate and several welded on steel fins which protrude upwards through the refractory. Single graphite electrode exploits the highly efficient heat transfer of the arc generated between the graphite top electrode and the anode provided by the charge of the furnace. In a modern shop such a furnace would be expected to produce a quantity of 80 tonnes of liquid steel in approximately 50 minutes from charging with cold scrap to tapping the furnace.
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All documentation provided includes comprehensive instructions for operational and maintenance personnel, including electrical diagrams of all components. The same as AC arc furnace, DC electric arc furnace uses the arc generated between the electrode and the furnace charge (or molten pool) to heat, so as to achieve the purpose of melting.
The use of EAFs allows steel to be made from a 100% scrap metal feedstock. These results are obtained all together if the cooling system in its entirety, either because of the material used or because of the structure or because of the dynamics of its functioning, makes it possible to obtain a low heat conductivity and at the same time a high electric conductivity. .