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.

Key words: Gas-liquid-solid mixing, Mixing equipment, Experimental research, Numerical simulation, Direct liquefaction

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