Electric Resistance Furnaces

Technological criteria:

 

Resistance furnaces are intended for heating, heat- and chemical-heat treatment, calcination, drying and sintering and also for vacuum treatment of different metal and non-metal materials and items.      The heating of a charge is usually performed in a chamber lined with refractories at the expense of the heat released by the heating elements of a big resistivity under the action of the electric current passing through them. In many resistance furnaces of a new generation the lining of light-weighing fiber refractories and heaters made of ferrochromealuminium alloys are used, providing the essential decrease in the preheating time, energy consumption and capital costs as compared with the furnaces, equipped with a brick lining and heaters of crome-nickel alloys. The heating of materials and items in the vacuum furnaces is performed under the pressure of 0.01 Pa.      Resistance furnaces are equipped with modern thyristor regulators of voltage and microprocessor-programmable regulators of temperature, providing a high-accuracy realization of temperature-time heating regimes.      Related to the resistance furnaces installations for electric heating and drying of ladles have the same functions as the most spread gas burning installations. However the former(s) have many advantages over the latter(s), which are as follows: ·  energetic: higher heat efficiency (up to 90%) and uniformity of heating; ·  technological: absence of sulphuric and carbonic deposits and humidity condensate on ladle lining, high a accuracy of preset temperature regime of heating; ·  ecological: absence of burnt product emission into atmosphere; ·  economic: longer (by 30%) service life of refractory lining and absence of costly gas cleaning system.