Evaluation of two ceramic tube gas fired aluminum holding furnaces

In the aluminum industry, economics provide a large incentive to replace present inefficient aluminum melting furnaces. The Gas Research Institute has initiated a program to develop a natural gas-fired immersed ceramic tube aluminum melting furnace. Aluminum holding furnaces, using the immersed ceramic tube heating concept, are currently undergoing industrial development. Two different commercial holding furnaces were purchased to study their operating performance envelopes and limitations of the materials of construction. Data gathered during actual holding furnace operation provide a baseline for the transition from holding furnace to melting furnace capability. The strengths and weaknesses of both designs tested are elucidated. 7 figures, 3 tables.