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What is the function of a steam turbine high-pressure oil pump?

1 Answers

AndrewMarie

09/02/25 2:40am

The function of the steam turbine main oil pump: to supply oil to the bearings of the unit, lubricating and cooling the bearings. It provides stable and sufficient pressure oil for the speed control system and protection devices. The main oil pump is one of the important auxiliary components of the steam turbine, installed inside the front casing of the unit. When the steam turbine is at full speed, it provides all the lubricating oil and safety oil for the unit. During the start-up and shutdown process of the steam turbine, the unit's lubricating oil and safety oil are provided by the auxiliary AC lubricating oil pump and the high-pressure start-up oil pump. Using the main oil pump can save plant electricity and prevent the risk of oil cutoff and bearing burning due to AC lubricating pump power failure. Additional information: 1. Working principle of the main oil pump: The main oil pump is a volute-type double-suction centrifugal pump, mounted on the steam turbine rotor in the front bearing housing and directly driven by the steam turbine main shaft, with a rigid connection to the main shaft. Since this driving method of the main oil pump can utilize the rotor's kinetic energy to supply oil to the bearings during inertial periods, it is the most reliable. It has a large capacity and stable outlet pressure. When operating at or near the rated speed, the main oil pump can supply all the oil required by the lubricating oil system. Additionally, it provides a backup oil source for the generator seal oil system. The main oil pump cannot draw oil by itself and must be continuously supplied with pressure oil. 2. Characteristics of the steam turbine main oil pump: The steam turbine main oil pump is a single-stage double-suction centrifugal pump, driven by the steam turbine main shaft and located on the extended shaft of the steam turbine in the front bearing housing. The main oil pump does not self-prime and must be continuously supplied with pressure oil. During start-up and shutdown, this task is completed by the start-up oil pump. When the steam turbine is at or near the rated speed, the oil is supplied by the oil turbine booster pump. The inlet pipe of the main oil pump is connected to the outlet of the oil turbine booster pump and the outlet pipe of the start-up oil pump, while the outlet pressure oil pipe of the main oil pump is connected to the inlet pipe of the oil turbine. The main oil pump has a large capacity and stable outlet pressure head, meeting the oil requirements of the entire lubricating oil system when the steam turbine is at or near the rated speed.

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