旋风分离器高温除尘性能的数值研究

Numerical Study on High-Temperature Dedusting Performance of Cyclone Separator

摘要: 基于RNGk-ε湍流模型和dpm离散相模型对旋风分离器的高温除尘分离性能开展数值研究，探究了旋风分离器的入口速度、温度、密度以及壳体热边界条件对固体颗粒分离效率的影响。结果表明，当入口流速不变时，温度在900 K时较600 K分离效率下降8.62%；当温度不变时，入口流速为25 m/s时较5 m/s分离效率上升了15.28%；当入口条件不变时，2800 kg/m³的石膏较600 kg/m³的新型灰提高了23.34%；在壳体非绝热条件下温度沿径向由内向外升高，分离效率在壳体非绝热条件下比壳体绝热条件下高13.15%，但在温度超过800 K后这种差异将提高到27.02%。

Abstract: In this paper, the high-temperature dust removal and separation performance of cyclone separator is numerically studied, and the effects of inlet velocity, temperature, particle density and shell thermal boundary conditions on the dust removal efficiency of cyclone separator are explored. The results showed that when the inlet flow rate was constant, the separation efficiency decreased by 8.62% at 900 K compared with 600 K. When the temperature is constant, the separation efficiency increases by 15.28% when the inlet flow rate is 25 m/s compared with 5 m/s. When the inlet conditions remain unchanged, the 2800 kg/m³ gypsum is 23.34% higher than the 600 kg/m³ new ash. Under the non-adiabatic condition of the shell, the temperature increases radially from the inside to the outside, and the separation efficiency is 13.15% higher than that under the adiabatic condition of the shell, but this difference will increase to 27.02% when the temperature exceeds 800 K.