【摘要】 为了合理评估火力发电厂中弹簧隔振基础中速磨煤机的振动性态,对5个电厂的8台磨煤机进行了现场振动测试,其中包括1台非隔振基础中速磨煤机。测试基础上、下台板和设备本体的振动位移及加速度。根据实测值评估磨煤机的振动安全性,并分析振动超限的原因。采用ANSYS程序建立磨煤机与基础耦合的有限元分析模型,进行模态分析和谐响应分析,并与现场实测结果进行对比,两者基本一致。进而分析了隔振器数量、基础台座与磨煤机质量比对磨煤机振动的影响,探讨中速磨煤机的减振措施。研究表明:弹簧隔振基础能有效减小磨煤机的振动向外传递;中速磨煤机隔振基础与非隔振基础台板顶面振动位移相近,但非隔振基础的地面振动位移比隔振基础大2～3倍。中速磨煤机弹簧隔振基础振动位移满足规范要求,但设备本体振动位移较大。为了达到良好的隔振效果,建议将中速磨煤机弹簧隔振基础的最大水平振动位移控制为50μm,基础台座与磨煤机的质量比控制为3.0±0.2。更多还原

【Abstract】 In order to evaluate rationally the vibration performance of medium-speed mill with spring vibration-isolated foundation in thermal power plant,eight mills in five thermal power plants including one mill with non-isolated vibration foundation were tested.The vibration displacement and acceleration of upper and lower bedplates of foundations and equipment bodies were measured.According to the test results the vibration safety of the mills was evaluated and the causes of vibration overrun for mill foundation were analyzed.A mill-foundation coupled finite element model was established using ANSYS,and then modal analysis and harmonic response analysis were performed.The comparison shows that the analysis results are basically in accordance with the test results.The influence of the number of vibration isolators and the ratio of foundation to equipment on the vibration of mill was analyzed.The shock absorption measures of medium-speed mills were discussed.The study shows that the transmission of vibration can be effectively reduced by the spring vibration-isolated foundation.The top surface vibration displacement of the spring vibration-isolated foundation is close to the non-isolated vibration foundation,but the ground vibration displacement of non-isolated vibration foundation is 2-3 times larger than the spring vibration-isolated foundation.The vibration displacement of medium-speed mill with spring vibration-isolated foundation meets the code requirements,but the vibration displacement of equipment body is larger.To get good vibration isolation effect,the maximum horizontal vibration displacement of medium-speed mill with spring vibration-isolated foundation is suggested as 50 μm,and the ratio of foundation to equipment as 3.0±0.2.更多还原