Analysis of the advantages and disadvantages of the two designs of foreign steam turbine security and lubricant system. The advantage of the main oil pump without spindle drag saves energy. Usually, the lubricating oil supply of the steam turbine is provided by the main oil pump outlet pressure oil through the oil injector, and the efficiency of the oil injector is very low. Generally, the power of the main oil pump is much larger than that of the electric lubricating oil pump, and the efficiency of the oil injector is one of the reasons. . At present, most of the domestic units with more than 100MW have completed the DEH transformation. For the units that have modified the DEH system, the main oil pump has a large margin and energy saving potential because it does not have to supply the regulating oil to the speed control system. The initial estimation of the 200MW unit is 1 year. It can waste 100,000 yuan of electricity.
Reduce failures. Since the main oil pump driven by the main shaft is mounted on the short shaft of the steam turbine, the installation requirements are high and often cause malfunction. For example, the main oil pump of a 300MW machine often causes the thrust tile temperature to be high; a 125MW and 100MW machine is abnormally operated due to the blockage of the main oil pump inlet injector by foreign matter; some 125MW machine porous injectors cannot withstand the oil flow scouring. Replace parts frequently. Not only that, because the small shaft of the steam turbine is often subjected to a large variable torque, the small shaft bolt can be broken, and the consequences are unimaginable. A small shaft of a 200MW unit is disconnected, the adjustment system loses the speed feedback, causing the speeding; the small shaft of a 300MW machine in Shandong is almost disconnected and caused a big disaster. Reduce maintenance. The new design system is simple, the failure rate is low, and the maintenance workload is greatly reduced.
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