小型汽轮机结构特点及其抗摆能力分析  

Structural Characteristics and Anti Swing Ability Analysis of Small Steam Turbines

作　　者：李成 Li Cheng(Guangzhou Guangzhong Enterprise Group Corporation,Guangzhou 510220,China)

机构地区：[1]广州广重企业集团有限公司,广州510220

出　　处：《机电工程技术》2023年第12期248-251,共4页Mechanical & Electrical Engineering Technology

摘　　要：汽轮机弹性板支撑结构与猫爪支撑结构相比,具有体积小、质量轻的成本优势,广泛应用于小型汽轮机中。为分析弹性板支撑结构汽轮机在外界载荷作用下的抗摆能力,以现场管道布置不合理导致机组受摆、冲转被迫中断的问题为例,建立有限元分析模型,通过ANSYS Workbench平台对现场问题进行分析。对比分析结果与现场实际测量数据,验证了有限元模型的正确性。采用对底盘两侧增加三角板支撑的方式有效改善机组受摆情况,使机尾往左偏移量由0.145 mm减少到0.005 mm。通过第三类边界条件分析汽轮机热态温度场,预测了热态条件下的机尾偏移量。根据分析结果对汽轮机后连接板相连的底盘部分进行加强,加强后机组各项指标正常并顺利冲转开机。结果表明,对弹性板支撑结构小型汽轮机而言,与后连接板相连的底盘区域是决定汽轮机抗摆能力的重要部位,对该部位两侧添加三角板支撑能明显提升汽轮机组的抗摆能力。Compared with the cat claw support structure,the elastic plate support structure of steam turbines has the advantages of small size and light weight,and is widely used in small steam turbines.In order to analyze the anti swing ability of elastic plate support structure steam turbines under external loads,a finite element analysis model is established to analyze the problem of unit swing and forced interruption of impulse starting caused by unreasonable on-site pipeline layout,the on-site problem is analyzed using the ANSYS Workbench platform.By comparing the analysis results with actual on-site measurement data,the correctness of the finite element model is verified.The method of adding triangular plates to support both sides of the chassis effectively improves the swing situation of the unit,reducing the left deviation of the tail from 0.145 mm to 0.005 mm.The thermal temperature field of the steam turbine is analyzed using the third type of boundary condition,and the tail deviation under thermal conditions is predicted.Based on the analysis results,the chassis part connected to the rear connecting plate of the steam turbine is strengthened.After strengthening,all indicators of the unit are normal and smoothly started.The results show that for small steam turbines with elastic plate support structure,the chassis area connected to the rear connecting plate is an important part that determines the anti swing ability of the steam turbine,adding triangular plate support on both sides of this part can significantly improve the anti swing ability of the steam turbine unit.

关 键 词：小型汽轮机 弹性板 有限元模型 底盘 抗摆 

分 类 号：TK263[动力工程及工程热物理—动力机械及工程]