关键词: 混合, 静态混合器, 旋流混合, 计算流体力学, 数值模拟

Abstract:

Mixing is a critical process in modern industry, and efficient mixing serves as the core of the phosphoric acid extraction and purification process in wet-process phosphoric acid manufacturing. This paper conducted a preliminary investigation into the mixing characteristics of micro-vortex mixers and explored the feasibility of enhancing the wet-process phosphoric acid extraction process through micro-vortex mixers. Using the Eulerian-Eulerian multiphase flow model, simulations were performed on Kenics mixers, single tangential-inlet micro-vortex mixers, and two tangential-inlets micro-vortex mixers under different inlet Reynolds numbers. A comprehensive comparison was made of the mixing performance, vorticity, turbulent kinetic energy, and pressure drop among the three mixers. The results indicated that micro-vortex mixers exhibit higher vorticity and turbulent kinetic energy, which were more conducive to mixing. The coefficient of variation (COV) at the outlet of the single tangential-inlet micro-vortex mixer was on average 0.15 lower than that of the other two mixers, demonstrating the best mixing uniformity. As the inlet Reynolds number increases, the pressure drop correspondingly rises. At an inlet Reynolds number of 7400, the dual tangential-inlet micro-vortex mixer exhibits the maximum pressure drop of approximately 12782.5Pa, representing 14.7% higher than that of the other two mixers. Considering the two key indicators of mixing uniformity and pressure drop, the single tangential-inlet micro-vortex mixer demonstrates superior performance.

Key words: mixing, static mixer, cyclone mixing, computational fluid dynamics, numerical simulation