利用有限元软件分析二次再热汽轮机冷态启动情况下中压转子的预热过程，研究暖机转速、转子初始温度以及进口蒸汽温度等因素对转子由脆性转变为韧性状态时间的影响。针对服役机组，对比分析了6种不同冷态过程下中压转子的预热行为。结果显示：改善上述任一影响因素均可以缩短转子所需的预热时间；维持转子初始温度及进汽参数恒定时，当暖机转速由360 r/min升至870 r/min时，转子预热时间可缩短2 h；维持暖机转速及进汽温度恒定时，转子初始温度由30 ℃升至70 ℃，转子预热时间可缩短1.26 h；维持暖机转速及转子初始温度恒定时，当进汽温度由373.1 ℃升至430 ℃时，预热时间可缩短0.28 h。采用转子初始温度30 ℃、暖机转速870 r/min、进汽温度373.1 ℃（工况1）的某二次再热服役机组冷态启动的实际暖机时间与理论模拟结果基本一致，从而验证了理论分析的准确性。

By using finite element software,the preheating process of intermediate pressure rotor of double reheat steam turbine during the cold startup was analyzed,and the influence of warmup speed,initial rotor temperature and inlet steam temperature on the process time of rotor from brittle state to ductile state was studied. Aiming at the inservice unit,the preheating behaviors of the intermediate pressure rotor in six different cold start processes were analyzed contrastively. The calculation results show that the preheating time of the rotor can be shortened by improving any of the above factors; maintaning the initial rotor temperature and inlet steam temperature constant,the preheating time of the rotor can be shortened by 2 hours when the warmingup speed is increased from 360 r/min to 870 r/min; maintaning the warmingup speed and inlet steam temperature constant,the preheating time of rotor can be shortened by 1.26 hours when the initial rotor temperature rises from 30 ℃ to 70 ℃; maintaning the warmingup speed and initial rotor temperature constant,the preheating time can be shortened by 0.28 hour when the inlet steam temperature rises from 373.1 ℃ to 430 ℃. Under the working condition Ⅰ with the initial rotor temperature of 30 ℃,warmingup speed of 870 r/min and inlet steam temperature of 373.1 ℃,the actual warmingup time of a certain double reheat inservice unit during cold startup is basically consistent with the theoretical simulation results,thus verifying the accuracy of the theoretical analysis.

TK263.6

国家重点研发计划项目(2017YFB0602103)