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Xie M.-H.,East China University of Science and Technology | Zhou G.-Z.,Zhejiang Great Wall Reducer Co. | Liu M.,China Oilfield Services Ltd. | Wu H.,China Oilfield Services Ltd. | And 2 more authors.
Huadong Ligong Daxue Xuebao/Journal of East China University of Science and Technology | Year: 2010

The poor solubility of hydrophobic associating polymer is the bottleneck for further improving the oil recovery by means of polymer flooding in offshore oilfield. In this paper, effects of temperature, salinity, stirring speed, impeller type and stirring method on the dissolution of polymer were investigated. Dissolution time and solution viscosity of hydrophobic associating polymer were measured. The experimental results show that high temperature and speed are favorable to improve the dissolving rate of the polymer, but unfavorable to the increase of polymer solution viscosity. There is an optimal salinity range for the dissolution of polymer. Impeller with low shear stress and large circulation flow rate is suitable for the dissolution of hydrophobic polymer. The operation mode of up-pumping and stirring speed changing from high to low can obtain a high polymer dissolution speed and a solution with high viscosity. Source


Wan X.,East China University of Science and Technology | Wan X.,Zhejiang Great Wall Reducer Co. | Zhou G.-Z.,Zhejiang Great Wall Reducer Co. | Xia J.-Y.,East China University of Science and Technology | And 3 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2010

The influences of impeller (slotting or not) on the properties of gas dispersion, gassed power consumption and gas holdup (volume fraction) were studied in a φ0.49 m stirred tank agitated by semicircle and parabolic blades disk turbine, which were identified as HY(SHY) and BTD(SBTD).The results show that the flooding transitions measured from loading to flooding (L-F) show a hysteresis compared with that measured from flooding to loading(F-L) with increasing and falling gas rates. Comparing the gassed power consumption and gas holdup between the two kinds of turbines, and under the same flow number, the slotting impellers have lower relative power demand (P g/P 0), and the power curves change a lot. At the same power consumption, the slotting ones have higher gas holdup, for example, SBTD, which is about 3% higher than BTD impeller over a wide range of gas rates; SHY is also higher than HY turbine. Therefore, the slotting turbines are worthy of being recommended to the industrial application of the gas-liquid stirred reactors. Source


Xie M.-H.,Zhejiang Great Wall Reducer Co. | Zhou G.-Z.,Zhejiang Great Wall Reducer Co. | Yu P.-Q.,Zhejiang Great Wall Reducer Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2010

Power number in baffled stirred tank with paddle type impellers was measured over a range of Reynolds numbers from laminar to turbulent flow regions. Impellers include 2-blade flat paddle impeller, 2-blade pitched paddle impeller, 4-blade pitched paddle impeller and 4-blade pitched paddle impeller (double-stage), with impeller-to-tank diameter ratio of 0.5-0.6. The measured power number was compared with other two methods, the correlations from literature and computational fluid dynamics (CFD). The power number correlations from the literatures show that the estimated values from the empirical correlations of Nagata agree well with the measured ones in the laminar regions, but the deviation is large in the turbulent regions. However, the power numbers from the correlations of Kamei and Hiraoka have good agreement in turbulent regions, but deviation is large in laminar regions. The power number in stirred tank was also simulated by CFD method. The numerical results present a satisfactory agreement with the experimental data at wide range of Reynolds number. Source


Xie M.-H.,East China University of Science and Technology | Xie M.-H.,Zhejiang Great Wall Reducer Co. | Zhou G.-Z.,Zhejiang Great Wall Reducer Co. | Long X.-L.,East China University of Science and Technology | Yu P.-Q.,Zhejiang Great Wall Reducer Co.
Gao Xiao Hua Xue Gong Cheng Xue Bao/Journal of Chemical Engineering of Chinese Universities | Year: 2011

Dissolution process of hydrophobically associating polyacrylamide AP-P4 was divided into three mixing states (the start of AP-P4 just feeding, the end of swelling, the end of dissolution). The flow fields of the three states in the dissolution tank with Pitched blade XJD and the new hydrofoil impeller KCXU were numerically simulated respectively by using computational fluid dynamics (CFD) method. The fluid velocities, circulation flow rates and shaft powers of the two impellers were investigated. The results show that, in three different states of AP-P4 dissolution process, the fluid velocities and the circulation flow rates in the stirred tank with KCXU are significantly greater than that in stirred tank with XJD, which indicates KCXU can increase the circulating rate. The deviations between the measured and the simulated shaft powers are within 16%. These results are of significance for the optimization of the industrial stirred tanks. Source


Guo X.-P.,East China University of Science and Technology | Guo X.-P.,Zhejiang Great Wall Reducer Co. | Zhou G.-Z.,Zhejiang Great Wall Reducer Co. | Long X.-L.,East China University of Science and Technology | And 2 more authors.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2015

The rheological properties of carboxymethylcellulose (CMC) solutions with three mass fractions(0.5%, 1.0% and 1.5% )were investigated under 298.15 K. In a multi-impeller stirred tank with 0.48 m diameter, the influences of impeller, operation conditions, viscosity or non-Newtonian characteristics on gas holdup and power consumption were studied. The results show that CMC solutions behave like pesudoplastic fluid and the relationship between its viscosity and shear rate can be described by the power-law model. Under the same operation conditions, the gas holdup drops and power consumption increases with the increasing of the concentration of CMC. At the same power input, the impeller combinations with down-pumping produce higher gas holdup and lower power consumption than that of others. The results from the correlations of gas holdup and relative power consumption are valuable to the industrial application of the gas-liquid stirred reactors. ©, 2015, Editorial Office of Chemical Engineering (China). All right reserved. Source

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