Abstract
AbstractRadiotracer‐based residence time distribution (RTD) measurements were performed for two identical wheat straw pulping digesters to evaluate and compare their performances. The radiotracer technetium (99mTc) as sodium pertechnetate was used to follow the liquid phase inside the digester. The product quality of both digesters was not identical for similar sets of operating conditions. Temperature, pressure, and mass flow rates were the influencing parameters, and the experimental and theoretical mean residence time (MRT) were compared. A significant amount of flow abnormalities was observed in the second digester as compared to the first one, including channeling, dead volume, scaling, and bypassing. The axial dispersion model and tank in series with the back‐mixing model were suitable for modeling the obtained RTD data.
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