Waste heat usage in the drying section of paper machines

摘要

The process involves drying a paper web by a steam-heated dryer (2), and supplying hot air to a high-temperature hood (1). Waste steam (5) is supplied from a steam system to a steam separator (6), where the steam is separated from condensate. A part of the condensate is passed to a heat exchanger (8), and temperature of the condensate is increased by the heat exchanger by transferring heat from exhaust air (4) of the high temperature hood. The heated condensate is returned as steam to the steam separator. An independent claim is also included for a system for utilization of waste heat.