EVALUATION OF GAS-SOLIDS MIXING CHAMBER THROUGH CROSS-CORRELATION ANDHURSTS ANALYSIS

Fast circulating fluidized-bed reactors are used for many applications , both in riser and downer modes. Typical residence times are in the o rder of a few hundreds of milliseconds. A good understanding of initia l gas-solids contact must be reached to realize the full potential of such reactors. Effective and stable gas-solids mixing chambers were id entified from the signals of simple and robust probes, which could be used in industrial and pilot plants. Criteria based on cross con elati on or Hurst analysis provided consistent results. Although this study wed simplified momentum probes, the criteria it developed can be appli ed to the signal of any fast-response sensor which is affected by loca l hydrodynamics. Temperature, capacitance, ultrasonic, or gamma-ray ab sorption measurements could be used. Gas or liquid-liquid mixing chamb ers could also be optimized with the same criteria.