浓缩型入口下排气旋风分离器流场和性能的数值计算

运用CFD方法,对浓缩型入口下排气旋风分离器内的气固两相流动进行了研究。计算中气相采用RNGk-ε湍流模型,颗粒相采用拉格朗日坐标系下的离散相模型。重点计算了分离器流场、分离效率及其阻力特性,结果表明,采用浓缩入口后分离器内流场发生明显改变,分离器上部切向速度明显提高,有利于大颗粒的分离。同时通过对不同浓缩结构旋风分离器的分离效率和阻力特性进行分析比较,为工程设计提供了依据。

NUMERICAL SIMULATION OF THE FLOW FIELD AND PERFORMANCE OF AN CYCLONE SEPERATOR WITH DOWNWARD DISCHARGE OF GASES AND LOUVER CONCENTRATOR INLET

The gas and solid flows have been studied by using the CFD methods. The RNG(renormalization group) k-ε turbulent model is employed for the single-phase, and the Lagrangian DPM model for the solid phase. The emphasis is focused on the flow field, the separating efficiency and the resistance pressure of the cyclone. The results show that the flow field in the cyclone changed obviously after adopting the louver concentrator inlet. The tangential velocity of gas and solid of the new type cyclone is larger than the common cyclone, which has the advantage of separating the large solids. The separating efficiency and the resistance of this cyclone with different types of louver concentrators are also studied. Which provides a basis for the engineering design.