关键词: 气液分离器, 数值模拟, 分离效率, 压力损失, 两相流

Abstract: Considering the low separating efficiency of conventional gas-liquid separator for small liquid drops, a new type of gas-liquid separator was proposed, which is available in a Mechanical Vapor Recompression (MVR) evaporation system, and its separation characterization was analyzed based on the research approach of a numerical simulation combined experiment verification in this study. Firstly, the numerical simulation method was employed to locate the most effective separation position through analyzing flow field and pressure distribution of the conventional gas-liquid separator, and the 3/4 circular baffle was installed there to construct a new type of gas-liquid separator. Secondly, separation characteristics of the proposed separator and influence rule of the number of 3/4 circular baffles were analyzed. Finally, the new separator structure was built and experimented to verify the simulation results and separation effect. The study results showed the separator with 3/4 circular baffle could improve the separation efficiency of small liquid drops significantly, with a little pressure loss. The circular body affected the separator characteristics significantly. With 3/4 circular baffle installed, the effective length of tangible movement could be increased and the radial velocity could be decreased, which plays a good role for increased separation efficiency with little pressure loss. Also, the separation efficiency and pressure loss are all increased with the number of 3/4 circular baffles. In this study, the separation efficiency of liquid drops with diameters less than 3 μm of the new separator structure could be increased by 15%, and pressure loss is only increased 200Pa .Combining the separation efficiency and pressure loss comprehensively, gas-liquid separators with two 3/4 circular baffles could achieve the most separation characteristics.

Key words: gas-liquid separator, numerical simulation, separation efficiency, pressure drop, twophase flow