ABB 5SHY6545L0001 AC10272001R0101 5SXE10-0181 IGBT晶闸管模块

ABB 5SHY6545L0001 AC10272001R0101 5SXE10-0181 IGBT晶闸管模块

ABB 5SHY6545L0001 AC10272001R0101 5SXE10-0181 IGBT晶闸管模块

汽轮机在运行中真空逐渐较低，真空值从-88kpa，逐渐下降至-77kpa，端差则从11℃上升至34℃，循环水供水温度<30℃，循环水量>6000m3/h，循环倍率大于60，循环水温度和流量完全满足运行要求。长期真空较低运行，影响机组效率，真空若继续降低将威胁机组安全运行，为了保证机组在安全范围内运行，降低了发电机的负荷，最高带额定负荷的80%，这样严重影响了及机组效率。

存在的问题及原因分析

凝汽器真空度下降的主要特征：

1、排汽温度升高；

2、凝结水过冷度增加；

3、真空表指示降低；

4、凝汽器端差增大；

5、机组出现振动；

6、在调节汽门开度不变的情况下，汽轮机的负荷降低。 

ABB 5SHY6545L0001 AC10272001R0101 5SXE10-0181 IGBT晶闸管模块

The vacuum of the steam turbine in operation is gradually lower, the vacuum value gradually decreases from -88kpa to -77kpa, and the end difference increases from 11℃ to 34℃. The circulating water supply temperature is <30℃, the circulating water volume is >6000m3/h, and the circulating water ratio is greater than 60. The circulating water temperature and flow rate fully meet the operation requirements. Long-term low vacuum operation, affecting the efficiency of the unit, if the vacuum continues to reduce will threaten the safe operation of the unit, in order to ensure that the unit operates within the safe range, reduce the load of the generator, the highest with 80% of the rated load, which seriously affects the efficiency of the unit.

The existing problems and reason analysis

Main characteristics of condenser vacuum reduction:

1, exhaust steam temperature rise;

2. The supercooling degree of condensate increases;

3, the vacuum indicator is reduced;

4, the condenser end difference increases;

5, the unit appears vibration;

6, in the case of regulating the opening of the valve is unchanged, the load of the turbine is reduced.