Integrated afterburner for drying ovens - with recycle of exhaust gas and continuous operation with air preheater

摘要

Integrated after-burning system for drying ovens can operate continuously and uses the heat generated in the after burner to heat the drying oven. Regulation of the heat input to the oven is controled by a damper in a by-pass round the mixing chamber. The burner feed is adjusted synchronously with this damper in order to maintain a temp. of 600-800 degrees C in the afterburner. The heat present in the flue gas is used in a heat exchanger to warm the fresh air necessary to maintain the furnace atmosphere below the lower explosive limit.