Recuperator (Air-to-Air Heat Recovery)

A Recuperator is a heat exchanger that recovers energy by transferring the heat of high-temperature waste gases generated during industrial processes to a cooler, cleaner air stream. By reusing waste energy, this system reduces fuel consumption and increases the overall efficiency of the facility.

Working Principle

In the recuperator, the hot flue gas stream and the cold fresh air stream pass through separate channels separated by a wall (separating surface) without mixing. Heat, in accordance with the fundamental law of thermodynamics, is transferred from the hot flue gas to the cold fresh air through this wall. This way, the heat energy that would have been expelled from the flue is recovered for use in the process (for example, to preheat the combustion air).

High Temperature Applications and Material Types

Recuperators are particularly suitable for high-temperature processes. They can be made from different materials, depending on the operating temperature:

• Application Range: Generally 600°C and above temperatures are used.
• Metallic Recuperators: These types are made of special alloy steels, 1000°C It can operate safely at temperatures up to .
• Ceramic Recuperators: eramic recuperators designed for higher temperatures 1500°C It can withstand up to .

Application Areas and Feasibility

Recuperators are widely used in energy-intensive industries. Their primary applications include glass, ceramics, cement, and melting furnaces, as well as natural gas combined cycle power plants. As with any waste heat recovery system, the feasibility of a recuperator investment depends on the availability of space within the facility where the recovered heat can be beneficially used.