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

摘要

The invention concerns a method whereby a product in condensed state, for example a solid in powder form circulates continuously in the longitudinal direction (6) of the kiln (4, 5). Said method consists in contacting with the product in condensed state a reactive gas mixture; drawing a plurality of samples of the gas mixture in several reference points (14) spaced apart from one another along the longitudinal direction (6) of the kiln (4, 5); analysing each of the gas samples outside the kiln to determine the composition of the gas mixture and deducing from the composition of the gas mixture in each of the reference points (14), the degree of progress in said point (14) of a chemical reaction between the product in condensed state and the reactive gas mixture. The device comprises in particular a sampling and injecting rod (10) inserted in the kiln (4, 5) and arranged along its longitudinal direction (6). The invention is particularly useful for modelling a rotary kiln (4, 5) for converting uranium oxyfluorides into uranium oxides and for adjusting the conversion in the kiln (4, 5).