Zhejiang Great Wall Reducer Co.

Wenzhou, China

Zhejiang Great Wall Reducer Co.

Wenzhou, China
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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

The mixing power curves of different types of mixers with baffles were plotted, including impeller type, turbine type, folding impeller type, impulse type with a wheel/tank diameter ratio of 0.4-0.6 which is higher than that with 1:3 of conventional ones, and dual-layer impeller types. The power curves of mixers with different impellers, including impeller with holes on blade, tubular impeller, arc impeller, and front-back surface half-pipe impeller, were plotted. The total is 24 curves. The construction type and various parameter ratios of plotting equipment were introduced for reference in mixer design. The significance of higher wheel/tank diameter ratio and dual-layer impeller in practice was explained. The power numbers of mixers with different construction were compared. Some information and advices were presented for the application of NP-Re curve.


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.


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.


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.


Xie M.-H.,East China University of Science and Technology | Zhou G.-Z.,Zhejiang Great Wall Reducer Company | 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.


Huang Z.-J.,Zhejiang Great Wall Reducer Co. | Xie M.-H.,Zhejiang Great Wall Reducer Co. | Zou Z.-F.,Zhejiang Great Wall Reducer Co. | Su Y.,Zhejiang Great Wall Reducer Co.
Huaxue Gongcheng/Chemical Engineering (China) | Year: 2012

The hydrodynamics characteristics of ZBK+BKS mixer and double helical ribbon impeller were studied by using Computational Fluid Dynamics (CFD) method. The flow patterns, power consumption, mixing time and mixing energy for the two mixers were investigated. The results show that in ZBK+BKS, the main function of the ZBK impeller is in the laminar flow regime to enhance axial pumping, while the BKS impeller contributes to flow for wide Re ranges especially in the transitional flow regime. The mixing time of ZBK+BKS mixer is lower than that of double helical ribbon in the transitional flow regime, but is similar to it in the laminar flow regime. The mixing energy is approximate between the ZBK+BKS mixer and double helical ribbon. Therefore, the mixing characteristics of the ZBK+BKS mixer are excellent in a wide range of Reynolds numbers.


Xie M.-H.,East China University of Science and Technology | Xie M.-H.,Zhejiang Great Wall Reducer Company | Zhou G.-Z.,Zhejiang Great Wall Reducer Company | Long X.-L.,East China University of Science and Technology | Yu P.-Q.,Zhejiang Great Wall Reducer Company
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.


Lin S.-B.,Zhejiang Great Wall Reducer Co. | Zhou G.-Z.,Zhejiang Great Wall Reducer Co. | Xie M.-H.,Zhejiang Great Wall Reducer Co. | Jia L.-W.,Zhejiang Great Wall Reducer Co. | Yu P.-Q.,Zhejiang Great Wall Reducer Co.
Journal of Chemical Engineering of Japan | Year: 2015

Mechanical agitators are widely used for accelerating the dissolution of hydrophobically associating polymers. However, the polymer dissolution process is nonuniform, changing from multiphase low viscosity to single-phase high viscosity. A single agitator, either a hydrofoil for low viscosity or an anchor type for high viscosity, cannot be optimized for the polymer dissolution process. In this paper, the use of double agitators for the polymer dissolution process is investigated. The double agitators are composed of an inner hydrofoil impeller, suitable for low viscosity fluids, and an outer anchor and frame type impeller, suitable for high viscosity fluids. In addition, different kinds of combinations and interactions between the two agitators are studied. The experimental process is also simulated using the CFD software package FLUENT, and the results are compared with experimental results. The predicted power consumptions are consistent with the experimental results. The experimental and numerical results show that different agitators have different effects during the polymer dissolution process. Using the same rotation direction for the inner and outer impellers increases the overall circulation in the stirred tank and accelerates the dissolution of the hydrophobically associating polymer. The inner impeller with down-pumping is more effective than that with up-pumping in the double agitator system. © 2015 The Society of Chemical Engineers, Japan.

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