Simplifying the air-fuel controls on the zonal gas trains on an aluminum billet-heating furnace provides better performance via improved combustion control.
The aluminum extrusion industry uses billet-heating furnaces to bring billets, or logs, up to the required hot-working temperature before loading the billets into the extrusion press (Fig.1). A global supplier and leading equipment manufacturer for use in the aluminum extrusion industry is Granco Clark Inc., Belding, Mich., who is one of the major suppliers of billet-heating furnaces to the industry. The Granco Clark furnace uses direct flame impingement and exhaust gas recuperative air jet convection to heat the billets (Fig. 2). The company recently introduced changes to its aluminum billet-heating furnaces to increase the furnace energy efficiency and improve combustion control.