A flue gas heat exchanger is a device used for heat exchange, primarily applied in various industrial processes and energy utilization fields. Its basic principle involves utilizing the heat exchange between high-temperature flue gas and low-temperature air to transfer heat from the flue gas to the air, thereby reducing the flue gas temperature and increasing the air temperature. Flue gas heat exchangers can effectively lower the temperature of flue gas emissions, minimize environmental impact, and recover thermal energy, enhancing energy utilization efficiency.

Chimney heat exchangers come in various types. Here are some common classifications and their characteristics:

In terms of structural form, flue gas heat exchangers can be categorized into plate and tube types. Plate-type heat exchangers offer higher heat transfer coefficients and a compact structure.