烟气轮机进气锥内部流场数值研究及应用

Numerical Study and Application of Flow Field in Inlet Cone of Flue Gas Turbine

烟气轮机是炼油厂催化裂化装置节能的关键装备,其工质为工艺过程中产生的具有一定压力的高温废烟气,烟气通过烟气轮机前端的进气锥流道整流加速后流向动叶片,动叶片叶身表面的压力差使其产生旋转的动力,从而带动鼓风机组工作或驱动发电机发电。但烟气中混合有催化剂固体颗粒物,目前进气锥的结构特性会引导烟气对动叶片叶身低截面处造成局部冲蚀,大幅降低动叶片的使用寿命。运用CFD软件分别对改进前后的进气锥流道模型进行流场数值分析,结果表明,合理的改进进气锥流道结构可改善烟气流场分布,有效缓解烟气对动叶片表面冲蚀不均的现象并减少气流在流道中的能量损失。研究结果可为优化烟气轮机结构设计提供理论依据。

The flue gas turbine is the key equipment for energy saving of catalytic cracking unit in the refinery.Its working medium is high-temperature waste flue gas with a certain pressure generated in the process.The flue gas flows to the moving blade after rectification and acceleration through the inlet cone channel at the front end of the flue gas turbine.The pressure difference on the surface of the moving blade makes it generates rotating power,so as to drive the blower unit to work or drive the generator to generate electricity.However,the flue gas is mixed with catalyst solid particles,and the structural characteristics of the forward air cone will guide the flue gas to cause local erosion at the low section of the moving blade body,so as to greatly reduce the service life of the moving blade.The CFD software was used to analyze the flow field of the improved inlet cone channel model and the improved inlet cone channel model respectively.The research results show that the reasonable improvement of the inlet cone channel structure can improve the distribution of the flue gas flow field,effectively alleviate the uneven erosion of flue gas on the surface of moving blades,and reduce the energy loss of airflow in the channel.The research results provide a theoretical basis for optimizing the structural design of flue gas turbines.