γ射线技术在测量旋风分离器内颗粒浓度分布上的应用

Application of γ-ray Attenuation Technology in Measuring Gas-solid Two-phase Concentration Distribution in the Cyclone Separator

在实验室循环流化床装置上用γ射线技术对直径Φ260 mm旋风分离器内的FCC催化剂颗粒浓度进行了测量。首先,在轴对称假设的条件下建立旋风分离器内径向颗粒浓度分布模型,然后根据所测实验数据重构出浓度分布图像。重构结果较为真实地反映了旋风分离器内颗粒浓度场的分布规律,且突出了近壁面高浓度梯度的特点。与光纤法的测量结果对比表明,两者在浓度分布的形态和数值上基本吻合,说明了γ射线技术测量流场可行性和可靠性。

The gas -solid two -phase concentration distribution in the φ260 mm cyclone separator in the fluid- ized bed setup was measured with γ - ray attenuation technology. On the assumption that concentration distribution is axial symmetry, the concentration distribution model was deduced. The model could give the concentration distribution image based on radial measuring data. The reconstruction result is more truly reflect the con- centration field distribution rule in the cyclone separator, especially shows that a higher solids concentration gra- dient near the wall. Comparing with the measuring result get by optical fiber method, both are consistent in the distribution and value of solids concentration, which verify the feasibility and reliability of this measuring method.