11 METAL SMELTERS AND REFINERIES, METAL REFLUX AND ROTARY FURNACES, ROTARY KILNS AND CONVERTERS, EXHAUST GAS TRAIL SYSTEMS, OIL AND GAS-FIRED COMBUSTION SYSTEMS, OXY-FUEL LANCES, INCINERATORS AND CONTROL AND INSTRUMENTATION SYSTEMS FOR MONITORING EXHAUST GASES FROM FURNACES IN THE METALLURGICAL PLANT