The typical Schack Double Shell Recuperator is ideally suited to high-temperature flue gases, dust-laden and with corrosive components.

It consists of two concentric steel cylinders. The flue gas flows through the inner cylinder, while the air is led through the narrow annular gap.

		This design has proven successful behind furnaces in steel mills, forging, glass and aluminium melting processes and in refuse and sludge incineration plants. In the glass and chemical industries, Schack Tube Cage Radiation Recuperators are often used to preheat large air quantities to high temperatures.
		Tube Cage

Glass melters are normally fired with oil or gas. Fuel savings up to 50 % are possible by using Schack® radiation recuperators for preheating the combustion air (2 recuperator units under construction are shown here). The capital expenditure and thus the melting costs are less in comparison with regenerative melters with higher air preheating temperatures.