Electric resistance furnace

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Electric resistance furnace

  1. 1. ELECTRIC RESISTANCE FURNACE
  2. 2. PROBLEM DEFINATION • Fabrication of furnace which is compact but achieves a high temperature is a difficult task. • Also cost of furnace plays major role in fabrication. • Our attempt through this project is to design and fabricate a furnace which is compact in size but still achieve a high temperature and economical.
  3. 3. FURNACE • Furnace is a device used for heating the material to change their shape and properties. • Nowadays many types of furnaces are available which has good temperature range but its limitation is size and cost. • For laboratory purpose, Furnace required should be compact in size and still can achieve high temperature.
  4. 4. Widely used furnaces are:- • Vacuum furnace • Electrical resistance furnace • Muffle furnace • Induction furnace • Arc furnace
  5. 5. Electrical Resistance Furnace(ERF) • ERF uses principle of indirect heating. • Refractory material tightly wounded by wire of metallic alloy(i.e. Kanthal, Nikrothal). • 2- AC supply is passed through the wire. • Internal resistance opposes the flow of current and hence heat is produced. • Heat is passed Through refractory material and by radiation as well as convection this heat is transferred to the charge.
  6. 6. Material used:- 1. Ceramic pipe 2. Kanthal wire (kanthal A-1 / Cr-Fe-Al) 3. Fire bricks 4. Glass wool 5. Variac 6. Thermocouple 7. Asbestos 8. POP or lime or MgO or Al2O3
  7. 7. Expected Result • We are expected to achieve a temperature around 1000 ̊C, in a furnace which is compact in size and economical. • It can be used for specimen heating in laboratory.
  8. 8. THANK YOU

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