Installation of a Brown Field Slag Reduction Furnace: State of the Art Off-Gas Treatment with Dry Gas Cleaning for SO_2 Capture

摘要

A new lead slag reduction furnace for the treatment of lead-rich slags from an existing top submerged lance (TSL) furnace has been installed at the Weser-Metall (WMG) lead plant in Nordenham, Germany. With the new reduction furnace, the lead content in the slags is lowered significantly, and lead bullion is produced. A Chinese side-blowing furnace (SBF) was selected for the reduction, and all plant technology around the furnace was engineered and supplied by Germany based company Kuet-tner. The furnace was integrated and further adopted into a Kuettner process concept to comply with European and clients' standards. The concept includes an off-gas treatment layout with a direct connection from furnace to waste heat boiler and controlled forced-air combustion to mitigate accretion formation in the boiler. Due to environmental requirements, this expansion of the lead operations had to ensure a decrease of the existing emission footprint of the entire plant. To accomplish this, Kuettner has installed a flue gas process line for the slag reduction furnace which integrates several existing emission sources from TSL operations and guarantees dust emissions below 0.2 mg/Nm~3 and SO_2 values below 250 mg/Nm~3 without the need for wet scrubbers.