300 MW空气透平低压缸鼓风发热实例研究OA

Windage can cause a rapid and significant increase of temperature in the flow path of turbine within a short period,thereby affecting the safe and stable operation of the unit.By analyzing the operation parameters of a 300 MW air turbine during long-time idling at 3 000 r/min and under initial load condition when windage occurred in the low-pressure cylinder,the correlations among parameters were investigated,thereby,the main influencing factors of windage in the low-pressure cylinder were identified.The study yields the following conclusions:during the speed-up phase of the air turbine,windage has already commenced in the last two stages of the low-pressure cylinder;at the shut-down transient after idling at 3 000 r/min and under load condition,the low-pressure exhaust temperature and the inlet temperatures of blades in the last two stages will be much higher.The highest operating temperature appears at the shut-down transient after idling at 3 000 r/min,and under all operating conditions,the inlet temperatures of the last-stage exhibit larger variation and higher absolute values compared to the inlet temperatures of the penultimate stage and the exhaust temperatures of the last-stage.Therefore,monitoring the inlet temperatures of the last-stage is essential in actual operation.The research findings can provide support for subsequent air turbine design and startup operation.