Design and construction of a heat recovery system from flue gases for the Krakow Municipal Holding

The scope of work included designing and building a waste heat recovery installation from flue gases in the Municipal Waste Thermal Conversion Plant for the Krakow Municipal Holding. The completed investment allows for the production of more thermal energy without increasing the volume of burned waste. It also enables a reduction in CO2 emissions into the natural environment and provides lower flue gas temperatures and significant water savings.

The main element of the flue gas heat recovery system is a two-stage scrubber located in the fan hall of the Krakow plant. The first part of the scrubber, called the cooler, is used for the initial conditioning of the flue gases. At this point, the hot flue gases are preliminarily cooled to a temperature of about 70°C and impurities are removed. The gases then pass to the condenser, where further cooling to a temperature of about 45°C occurs, along with the condensation of moisture from the flue gases. This process is facilitated by the circulation of the working fluid between the condenser tank and the structural filling. The heat obtained in the condensation process is transferred through plate heat exchangers to the Krakow city district heating system.