METHOD AND DEVICE FOR DETERMINING THE EVOLUTION OF A CHEMICAL REACTION IN A KILN AND FOR ADJUSTING THE REACTION

摘要

A substance in a condensed state, for example a powdered solid, is in continuous movement in the longitudinal direction ( 6 ) of a furnace ( 4, 5 ). A reactive gas mixture is brought into contact with the substance in the condensed state. A plurality of samples of the gaseous mixture are removed at a plurality of reference points ( 14 ) spaced apart from one another along the longitudinal direction ( 6 ) of the furnace ( 4, 5 ); each of the gas samples is analyzed outside the furnace to determine the composition of the gas mixture and for each point ( 14 ), the extent of a chemical reaction between the condensed substance and the reactive gas mixture is deduced from the composition of the gas mixture at each of the reference points ( 14 ). In particular, the apparatus comprises a sampling and injection rod ( 10 ) introduced into the furnace ( 4, 5 ) and disposed in its longitudinal direction ( 6 ). The invention is of particular application to modeling a rotary furnace ( 4, 5 ) for converting uranium oxyfluoride into uranium oxides and for controlling the conversion reaction in the furnace ( 4, 5 ).