The surface temperature of the billet exiting the caster is around 800-900°C and the core temperature is around 1100-1300°C. This becomes a hindrance in the plants where they practice Hot Charging of billets in the rolling mill. The billets lose about 50-100°C of their surface temperature and around 100-200°C of their core temperature during the travel from the caster to the rolling mill. At these temperature, the rolling of billets lead to serious problems like:
To overcome these issues, the end-user needs to improvise and look for solution such as :-
To overcome the above problems, ENCON provides a tunnel furnace which uses a liquid or gaseous fuel to raise the surface temperature of the billets from 800°C to 1050°C. The design of the burners is such that the resultant flame is short and highly luminous to ensure maximum heat transfer through radiation and convection. Moreover, the burner flame length can be adjusted according to the size of the billets.
The benefits of this approach are as follows:
We can also provide regenerative burners to increase system efficiency.