Improvement in ladle technology for conservation of heat energy
Dhananjay K Kakde, Gunwant D Shelake
Currently steel industries are the largest energy consuming sector in the world, accounting for 15% of world’s industrial energy consumption & the total cost of producing steel 20% is spent on energy. The increasing cost of energy and its current and future availability shows the need to refocus attention on energy conservation. During processing & transportation of liquid iron in ladles there is continuous reduction of temperature from refractory lining due to heat losses from conduction & radiation. In order to keep a usable pouring temperature into the mould, these heat losses must be compensated by excess tapping temperatures in the furnace. This in turn leads to increase cost of heating the iron as well as higher alloy consumption & refractory wear. The research primarily focused on reducing the consumption by decreasing the tapping temperature. Therefore a layer of high strength insulating material behind a safety lining was considered. The benefits of using the insulation layers are lower shell temperatures, the improvement of liquid iron temperatures, these results in improved lower energy consumption, a reduction in furnace refractory consumption. The use of insulating ladle reduces energy consumption by 1.39% and ladle outer shell temperature reduced by 98°C.