Johns Manville has gained invaluable experience with oxy-fuel combustion when they converted two fibreglass furnaces in Cleburne, Texas. In order to improve the performance beyond oxy-fuel firing, Johns Manville implemented Oscillating Combustion (OC) on one of their borosilicate wool fibreglass furnaces in April 1999. The OC technology was tested continuously for ten months and it provided a 55% NOx reduction; a 10-12% reduction in specific oxygen consumption; a 4% fuel savings; and a 30-50 deg F reduction in hot-spot crown temperature without reduction in glass temperatures. The Oscillating Combustion has been transparent to the furnace operation and high quality glass is produced at maximum production capacity of the downstream machines.
