为保障自主设计的燃气轮机气体燃料控制阀阀壳结构强度满足要求，以DN80气体燃料控制阀阀壳为研究对象，采用弹性应力分析与塑形设计准则相结合的基本原则，通过有限元分析技术，研究了气体燃料控制阀阀壳在燃气轮机稳态和瞬态工况下的温度场、应力场分布，并对其进行强度校核。气体燃料控制阀设计压力4MPa，设计温度220℃，燃气轮机瞬态工况下天然气热力参数的数据取自某电厂9FA燃气轮机VGC2燃气调节阀的实际运行数据。研究表明：阀壳在燃气轮机稳态额定负荷工况、阀壳设计工况、阀壳水压试验工况和燃气轮机停机工况下强度设计合格；在燃气轮机热态起动工况、温态起动工况和冷态起动工况下应力比分别为1.86、2.00、1.51，均大于校核判据值1.5，强度安全裕度不足；通过结构优化改进，将阀壳出口凸台下圆角部位的圆角由0.5mm增大到2mm，阀壳在燃气轮机瞬态变工况下的应力水平显著降低，提高了结构强度安全余量。

To guarantee that the structural strength of the self-designed gas turbine gas fuel control valve shell meets the specified requirements, the DN80 gas fuel control valve shell as the research object. Adopting the basic principles of elastic stress analysis and shaping design guidelines, through the limited element analysis technology, the temperature field and stress field distribution of the gas fuel control valve shell are calculated and checked under the stable and transient condition of the gas turbine, and the strength school nuclear was carried out. The design pressure of the gas fuel control valve is 4MPa, and the design temperature is 220 ℃. The thermal parameters of natural gas for gas turbines under transient conditions are taken from the actual operating data of the VGC2 gas control valve of a 9FA gas turbine in a certain power plant. It has been found that the strength design of the valve shell is qualified in the steady state rated load condition of the gas turbine, the design condition of the valve, the hydraulic test condition of the valve and the shutdown condition of the gas turbine; The stress ratios under the hot start condition , the warm start condition and the cold start condition of the gas turbine are 1.86, 2.00, and 1.51, respectively, which are all greater than the verification criterion value of 1.5, indicating the strength safety margin is insufficient. Through the structural optimization of the valve shell, the fillet at the rounded area below the valve outlet boss was increased from 0.5mm to 2mm. The stress level of the valve shell is significantly reduced under the transient condition of the gas turbine, which increases the structural strength and safety waste.

TK225

国家自然科学基金项目（面上项目，重点项目，重大项目）