摘要:
在2019年和2020年两年的风电抢装潮背景下, 合同违约、设备无法如期交付等事件时有发生。以华东地区某风场为例, 风场大部分风机基础已浇筑完成, 但风机厂家无法如期交付上部塔筒及设备, 业主被迫选择其他风机厂家。而新风机厂的塔筒和已建基础的接口不匹配, 塔筒接口大于基础接口, 且塔筒已生产, 无法直接安装, 基础与塔筒之间的转接节点成为最重要的设计环节之一。针对该风场的2.4 MW机组、轮毂高度为141 m的风塔, 基于ABAQUS有限元分析软件对已建风机基础与置换塔架转接节点的受力性能进行分析, 包括极限工况和疲劳工况。分析结果表明, 极限工况下转接节点钢筒壁厚在37~45 mm范围内变化时, 最大塑性总应变均小于1.0%;在塔架服役期内, 钢筒壁与下法兰之间的对接焊缝焊趾处损伤累计值较大, 对设计起控制作用; 当转接节点钢筒壁厚在37~45 mm范围变化时, 疲劳危险点损伤累计值随厚度增大而降低, 壁厚39 mm对应的损伤累计值大于限值1.0, 壁厚45 mm对应的损伤累计值为0.66, 最终将壁厚保守取为45 mm; 将转接节点视为基础的一部分, 采用转换节点后, 其基础的整体抗弯刚度为81 GN·m/rad, 仍满足风机厂家对基础的最小抗弯刚度要求(30 GN·m/rad), 机组可安全运行。
Abstract:
Under the background of rush to install in 2019 and 2020, incidents such as contract breaches and equipment not being delivered on schedule occured from time to time. This paper takes the wind farm in East China as an example, most of the foundation has been poured, but the wind turbine manufacturer cannot deliver the tower and equipment as scheduled, and the owner is forced to choose another wind turbine manufacturer. However, the tower of the new wind turbine manufacturer does not match the interface of the established foundation. The interface of the built tower is larger than the interface of the foundation and cannot be installed directly. The Transition joints between the foundation and the tower has become one of the most important design links. This paper takes a wind turbine tower with a height of 141 m for a 2.4 MW wind turbine as an example. Based on the ABAQUS finite element analysis software, the mechanical performance of the transition joint between the established wind turbine foundation and the replacement tower was analyzed, including extreme conditions and fatigue conditions. The analysis results showed that the total plastic strain is less than 1.0% when the wall thickness of the transition joint steel tube changes within the range of 37-45 mm under the extreme conditions; during the service period of the tower, the cumulative value of the damage at the weld toe of the butt weld between the steel tube and the lower flange is relatively large, and the fatigue conditions control the design. When the wall thickness of the transition joint steel tube changes within the range of 37-45 mm, cumulative fatigue damage of dangerous point decreases while the thickness increase. The cumulative fatigue damage exceeds 1.0 with the thickness 39 mm, and equals 0.66 with the thickness 45 mm. For the safety consideration, the final thickness will be 45 mm. With the transition piece, the bending stiffness of the foundation is 81 GN·m/rad, that can fulfil the minimum 30 GN·m/rad requirements of the wind turbine manufacturer. The wind turbine manufacturer can run safely.
登录
注册
点击查看大图
下载:
