In Regenerative Furnace, air preheating is achieved by two regenerators chambers. The chambers are filled with layers of refractory checkers, arranged in offset position.
The exhaust from the furnace and the cold combustion air are passed, alternately, through one and other chambers for a certain period of time.
The checkers, heated by hot waste gases, releases the accumulated heat allowing to reach a high temperature typically 1300° C to the combustion air.
In Recuperative Furnace, air preheating is achieved by the heat exchange from the exhaust to the combustion air by means of metal recuperator.
The exhaust pass through a metal heat exchanger and transmit the heat to the combustion air.
To increase the air temperature, the recuperator may be configurate in a double stage reaching 750°C typically. The preheated air is conveyed to the burner by metallic ducts, where it matches the fuel developing the flame.
The system is composed with:
- Tubes in stainless steel.
- Casing of the tube cage made of carbon steel, internally lined with ceramic fibre+rock wool.
- Double shell recuperator internal plate made of stainless steel.
- Air intermediate duct made of carbon steel.
- External insulation of the double shell recuperator and of the intermediate duct with rock wool finished with galvanised plate.
- Air inlet and outlet flanged connections.
- Tightness test in our workshop