… compared with regenerative type furnaces the recuperative type features lower efficiency but higher flexibility. The lower efficiency is consequence of the technology of the recuperator which is made with special steel which cannot operate with air temperatures above the resistance limits of the steel.
The recuperators can be divided in different kinds in function of their constructive technology (double shell and tube bundle) and in function of the range of hot air temperature.
The hot air temperature starts from 500°C of a double shell type up to 700°C of the tube bundle. Combinations of tube bundle and double shell type can recover up to a temperature of 850°C.