摘要

A new structure of gas-liquid separator, which can be used in a mechanical vapor recompression (MVR) evaporation system, was proposed to improve separation efficiency of conventional gas-liquid separator for small liquid drops, and its separation characteristics were analyzed based on the numerical simulation and experimental verification. The numerical simulation method was employed to locate the most effective separation position through analyzing the flow field and pressure distribution in the conventional gas-liquid separator, and the 3/4 circular baffles were installed there to construct a new structure of gas-liquid separator. The separation characteristics of the proposed separator and the influence of the number of baffles were analyzed by simulation. Then the new separator structure was built and used for experiments to verify the simulation results and examine its separation effect. The results showed that the 3/4 circular baffle improved significantly the separation efficiency for small liquid drops, while the pressure drop increased little, since the effective length of tangential movement of gas flow was increased and its radial velocity was decreased. As the number of baffles increased, the separation efficiency and pressure drop both increased. Under the calculation condition in this study, the separation efficiency for the liquid drops with diameters less than 3 μm could be increased by 15% and the pressure drop only increased 200 Pa for the new separator structure. For the separation efficiency and pressure drop, the gas-liquid separator with two 3/4 circular baffles could achieve the best separation effect. Under the experimental condition in this study, the separation efficiency for liquid drops was increased by 5% compared to the conventional gas-liquid separator.

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