Lundberg designs heat recovery systems for most continuous digesters found in pulp and paper mills. These heat recovery systems can be designed for Kamyr™, Pandia™, M&D™ and other continuous digesters.
For the large continuous digester systems, the heat is recovered from extraction liquor flash tanks and the steaming vessel. In mills pulping pine or other resinous softwood, the continuous digester heat recovery system also doubles as the turpentine recovery system. These systems typically will contain a cyclone separator, pressure vacuum relief valve, either single or two stage condensers, and the turpentine decanter and storage tanks. The condensers are falling film shell and tube units with the vapor inside of the tubes and cooling water on the outside.