Abstract
This work firstly applied a pilot scale jet-flow HSM with high energy efficiency in suspension operation of high concentration solids. The applicability of Zwietering’s criterion for jet-flow HSM was evaluated and improved. The effect of different structural parameters on the critical speed for just-off-bottom suspension and power consumption was investigated. The jet-flow HSM can complete suspension task at high solids concentration exceeding 40 wt%. The Njs and the Pjs of jet-flow HSM would obviously increase with increasing the solids concentration. Besides, the Njs and the Pjs for downforce rotor are the smallest compared with vertical rotor and lifting rotor, and the Njs reduces while the Pjs increases with deceasing the blade angle. The Njs and the Pjs rapidly reduce with increasing the bottom opening of stator. The visualization was carried out to analyze the status of solids dispersion in stagnant regions of tank bottom. Furthermore, the optimum solid loading was determined by evaluating the specific power εjs. Finally, prediction models for Njs, Pjs, and εjs were established, which can provide the effective guidance for the application of jet-flow HSM in practical suspension operation.
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