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Abstract: A coal slurry mixing tank is a key piece of equipment in the preparation of coal slurry for direct coal liquefaction. It is a gas-liquid-solid three-phase mixing device. Based on the performance of the existing coal slurry mixing equipment, a type of test equipment for horizontal continuous coal slurry preparation was developed, but to this point has limited research results. The test equipment consists of a mixing cylinder, mixer, stirring impeller and other components. Slurry mixing experiments were undertaken using the prototype, testing the performance of the device. A mathematical model was proposed specifically for the operation of a coal slurry mixing tank that is horizontally operated with high slurry concentration and rotary flow. The flow field in the horizontal coal mixing tank was simulated with the computational fluid dynamic (CFD) method. The experimental results match well with the CFD simulation results. Results show that the test device of a coal slurry mixing tank can be used to model the mixing of pulverized coal and the solvent oil. A strong correlation was obtained.

[1] Bhattacharya, S., Hebert, D., Kresta, S.M., 2007. Air entrainment in baffled stirred tanks. Chemical Engineering Research and Design, 85(5):654-664.

[2] Calabrese, R.V., Francis, M.K., Mishra, V.P., Phongikaroon, S., 2000. Measurement and Analysis of Drop Size in Batch Rotor-stator Mixer. Proceedings of 10th European Conference on Mixing. Elsevier Science BV, Delft, p.149-156.

[3] Chen, Z.P., Zhang, X.W., Lin, X.H., 2004. Preferred Manual of Stirring and Mixing Devices. Chemistry Industry Publishing Company, p.108-115 (in Chinese).

[4] Delafosse, A., Line, A., Morchain, J., Guiraud, P., 2008. LES and URANS simulations of hydrodynamics in mixing tank: Comparison to PIV experiments. Chemical Engineering Research and Design, 86(12):1322-1330.

[5] Guha, D., Ramachandran, P.A., Dudukovic, M.P., 2007. Flow field of suspended solids in a stirred tank reactor by Lagrangian tracking. Chemical Engineering Science. 62(22):6143-6154.

[6] Guha, D., Ramachandran, P.A., Dudukovic, M.P., 2008. Evaluation of large eddy simulation and euler-euler CFD models for solids flow dynamics in a stirred tank reactor. AIChE Journal, 54(3):766-778.

[7] Guevara, L.E., Sanjuan, G.R., Cordova, A.M., Soledad, C.G., Ascanio, G., Galindo, E., 2008. High-speed visualization of multiphase dispersions in a mixing tank. Chemical Engineering Research and Design, 86(12):1382-1387.

[8] Murthy, B.N., Ghadge, R.S., Joshi, J.B., 2007. CFD simulations of gas-liquid-solid stirred reactor: Prediction of critical impeller speed for solid suspension. Chemical Engineering Science, 62(24):7184-7195.

[9] Sherwood, R., 1987. A Blender Used for Mixing Slurry Material and Liquid or Double-state. China Patent No. CN87102245 (in Chinese).

[10] Torre, J.P., Fletcher, D.F., Lasuye, T., Xuereb, C., 2007. Single and multiphase CFD approaches for modelling partially baffled stirred vessels: Comparison of experimental data with numerical predictions. Chemical Engineering Science, 62(22):6246-6262.

[11] Wang, F.D., Wang, Z.N., Rui, S., 2003. A Device Producing Coal-water or Coal-coil Slurry. China Patent No. CN2644909Y (in Chinese).

[12] Xiao, H.H., Takahashi, K., 2007. Mixing characteristics in the horizontal non-baffled stirred vessel in low viscosity fluid. Journal of Chemical Engineering of Japan, 40(8):679-683.