The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble＇s dispersion and disintegration of magnesium vapor were the key to boosting the desulfuriza...The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble＇s dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble＇s dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers.展开更多
Water model experiments were carried out to investigate the bubble behavior in cylindrical and square vessels under centric mechanical stirring.The bubble behavior in the square vessel was investigated in detail by us...Water model experiments were carried out to investigate the bubble behavior in cylindrical and square vessels under centric mechanical stirring.The bubble behavior in the square vessel was investigated in detail by using a high-speed camera to record the transient images of the bubbles.An image analysis software was used to obtain the bubble diameter.The results showed that the centric mechanical stirring in the square vessel was suitable for breakage and dispersion of bubbles,but not suitable for that in the cylindrical vessel.Increasing the impeller blade length and impeller rotation speed was beneficial to disintegrate and disperse bubbles widely.The bubble diameter decreased with the increase in the Weber number and increased slightly with the increase in the modified Froude number.The dimensionless correlation equation of bubble diameter was obtained by the dimensional analysis method.展开更多
基金Item Sponsored by National Natural Science Foundation of China(50974035,51074047)High Technology Research and Development Program of China(2010AA03A405,2012AA062303)Innovation Team Project of Provincial Science and Technology of Liaoning Province of China(LT2010034)
文摘The new method of in-situ desulfurization with mechanical stirring of new type impellers was introduced, in which the bubble＇s dispersion and disintegration of magnesium vapor were the key to boosting the desulfurization efficiency and increasing the utilization rate of magnesium. Effects of different new type of impellers on bubble dis persion and disintegration were studied through bubble image analysis, gas-liquid mass transfer, and power con- sumption levels of different impeller structures. The results showed that the sloped swept-back blade impeller-2 pro- duces optimal bubble＇s dispersion and disintegration, as well as higher volumetric mass transfer coefficient and CO2 gas utilization while consuming the least power. Numerical simulation result with Fluent software also showed that the sloped swept-back blade impeller-2 has higher turbulent kinetic energy and better velocity distribution than the other two impellers.
基金This work was supported by the Key Technologies Research and Development Program(Nos.2017YFC0210404 and 2017YFC0210403-04)the National Natural Science Foundation of China(Nos.U1760120,U1710257,U1702253,and U1903129).
文摘Water model experiments were carried out to investigate the bubble behavior in cylindrical and square vessels under centric mechanical stirring.The bubble behavior in the square vessel was investigated in detail by using a high-speed camera to record the transient images of the bubbles.An image analysis software was used to obtain the bubble diameter.The results showed that the centric mechanical stirring in the square vessel was suitable for breakage and dispersion of bubbles,but not suitable for that in the cylindrical vessel.Increasing the impeller blade length and impeller rotation speed was beneficial to disintegrate and disperse bubbles widely.The bubble diameter decreased with the increase in the Weber number and increased slightly with the increase in the modified Froude number.The dimensionless correlation equation of bubble diameter was obtained by the dimensional analysis method.
