大型厚壁筒体电磁感应加热均温性控制与参数优化

Control and parameter optimization in electromagnetic induction heating temperature uniformity of large thick-walled cylinder

采用有限元方法对外径φ1900 mm,壁厚100 mm筒体外壁局部电磁感应加热进行模拟,基于该筒体现场电磁感应加热试验,设计了步进式升温调控方法,分析了不同感应加热参数对筒体局部热处理温度场的影响,得到了最佳感应加热参数。结果表明,根据技术要求,保温温度为595~620℃,选取φ20 mm直径的感应电缆,匝数为16匝,匝间距32 mm,外壁保温宽度为1460 mm,内壁全保温为最佳设计参数。感应加热的电流频率越大,筒体表面的升温速度越快。为了保持温度均匀性,建议合适范围内选取较小频率2 kHz。

Based on the electromagnetic induction heat treatment experiment of 100 mm thick-walled cylinder of φ1900 mm with external diameter, a step-type temperature rise control method was designed, and the influence of different induction heating parameters on temperature field of local heat treatment of cylinder was analyzed, and the optimal electromagnetic induction heating parameters were obtained. The results show that, according to the technical requirements of the holding temperature of 595-620 ℃, the best designed parameters are that the 20 mm diameter induction cable is selected with the induction coil number of 16, the width of the outer wall insulation is 1460 mm, the inner wall is fully insulated, and the turn spacing of 32 mm is the best design parameters. The larger the current frequency of the induction heating, the faster the heating rate of the cylinder surface. In order to maintain temperature uniformity, it is recommended to choose a smaller frequency of 2 kHz within the appropriate range.