自承载式生物质锅炉刚度结构优化设计仿真

Optimized Stiffness Structure Design and Simulation of Self-bearing Biomass Boiler

水冷壁管件和扁钢的焊接边界复杂,导致锅炉整体结构的承载能力、变形、应力等力学性能不清楚。为了解决上述问题,按等刚度原则将水冷壁管板结构等效转换为薄板,起增强结构横向刚度作用的刚性梁则简化为法向约束,并进行压载物理试验及其有限元仿真,以误差小于10%为目标优化了模型的单元类型、网格大小等设置,准确快速地建立了具有力学相似性的刚度结构模型。研究结果表明,生物质锅炉刚度结构的等效建模法具有良好的可行性与准确性,能够满足工程需要。

The welding boundary of water wall tube and flat steel is complicated, so the bearing capacity, the de- formation and the stress of whole boiler structure are not clear. In order to solve above problems, the structural equiv- alent of the water cooled wall tube plate was converted into thin plate based on the principle of equal stiffness, and the rigid beam that enhances transverse stiffness of the structure was simplified as the normal direction constraint. The ballast physical test and finite element simulation were carried out, and the element type, mesh size and other settings of the model were optimized with error less than 10% in the above calculation. The stiffness structure model with mechanical similarity was established accurately and rapidly. The results show that the equivalent modeling method of the stiffness structure of biomass boiler is of good feasibility and accuracy, and can meet engineering needs.