Walking Hearth Furnace

This Furnace is the heart of any hot rolling mill. In this furnace, charge is heated to rolling temperature. This charge could be in the form of billets, blooms, slabs or ingots.

This furnace is of two types:

  • 1. Top fired
  • 2. Top and bottom fired

Different Furnace Zones

  • Preheating zone/Recuperative zone:
    In this zone, the flue gases move in a direction opposite to that of the charge. This ensures considerable amount of waste heat recovery by convection.
  • Heating zone:
    In this section, the actual heating takes place.
  • Soaking zone:
    This is the critical zone of the furnace. Uniformity in temperature up to desired limits between the core and the surface is achieved in the soaking zone.

Note: For charge with higher thickness, burners are provided below and above the skids. This is known as top and bottom fired Reheating Furnace. E.g. blooms and slabs

Salient Features

  • Highly fuel efficient furnaces due to proper roof profile or zonal distribution, optimum preheating, optimum recuperative zone lengths and optimum instrumentation.
  • Efficient transfer of radiant heat through the useful heat transfer area created by the charge bed.
  • The burners are selected and located for uniform distribution of heat to avoid hot spots.
  • Fully automatic burners and temperature controlling through PC based PLC.
  • Furnace provided with furnace chamber pressure control to eliminate atmosphere air ingress, which also reduces the scale loss and decarb of the charge.
  • Supervision of installation and commissioning by qualified Thermovision engineers.
  • All technology and post commissioning support is provided by Thermovision staff.