GF-ELTI Mobile Muffle Furnaces are plants used for reheating semi-finished products for the forging process.
This type of furnaces is characterised by a maximum operating temperature of abt. 1,300 °C and it enables to obtain excellent temperature uniformity in the furnace chamber.
These furnaces typically consist of:
The plant is built according to the logic of modular prefabrication, which enables to quicken the on-site assembly stages of the plant without requiring the realisation of foundations, but of an adequate support surface only.
The refractory linings for insulation of the parts forming the furnace can be either cast or made of fibrous materials, according to the application.
The mobile muffle can be equipped with guillotine doors; in this case, to move from one base to another one, the muffle is slightly lifted from the base; the doors open and the muffle is shifted.
As an alternative, the muffle can be realised without doors; in this case, to move from one base to another one, the muffle is completely lifted from the base so as to go beyond the overall dimensions of the charge and then shifted.
In both cases, after reaching the position, the muffle is placed on the base so as to ensure the tightness and insulation of the furnace chamber.
These plants are equipped with GF-ELTI Regenerative Burners, characterised by high speed and fixed power. Their operation is managed through a PLC and the energy supply is kept under constant control by changing the ON and OFF times, to which every single burner is subject. The flame produced by this type of burners enables to obtain high turbulence within the furnace chamber, thus ensuring optimal convective exchange and temperature uniformity.
Above the temperature threshold set at 800°C, combustion occurs according to the energy catalytic action, which implies fuel gas and hot air injection directly in the furnace to avoid mixing the two fluids in the burner nozzle. This technology enables to lower down NOx emissions and to increase the heat exchange coefficient. At the same time, it preserves the burner components that are usually thermally stressed, which means reducing maintenance operations to a minimum and decreasing consumption by max. 50% compared to conventional burners.
The types of treated products are: ingots, steel roughed items or products of various dimensions, weight and shape.
