Overview of main Turbine Oil Purification Machine
The main engine oil supply system mainly refers to the Turbine Oil Purification Machine system, the top shaft oil system and the regulating security oil system of the turbogenerator set, which is an important system to ensure the safe and stable operation of the unit. The main engine oil supply system of 350MW turbo-generator set generally uses turbo-oil as lubricating oil and hydrogen sealing oil, and anti-fuel oil as regulating security oil. The turbo-oil and anti-fuel oil are two completely independent oil systems.
In normal operation of the unit, the lubricating oil system is usually supplied by the main oil pump driven by the main shaft of the turbine. Its main function is to provide lubricating oil for main bearing, thrust bearing and turning device of steam turbine generator set and oil for jacking shaft system. For the sealing oil system to seal hydrogen, and for the operation of mechanical overspeed tripping device.
- Main equipment, working principle and function of lubricating oil system
The steam turbine generator set is a large machine running at high speed. Its support bearings and thrust bearings need a lot of oil to lubricate and cool. Therefore, the steam turbine must have an oil supply system to ensure the normal operation of the above devices. Any interruption of oil supply, even for a short time, will cause serious equipment damage.
Lubricating oil system and regulating oil system are two independent systems. The working medium of lubricating oil adopts turbine oil, which is equivalent to the NATIONAL standard GB11120-89 turbine oil and the oil brand ISOVG32.
Introduction to the system process:
The lubricating oil system adopts the main pump-injector oil supply mode, the main task is to provide qualified lubrication and cooling oil to the bearings (including support bearings and thrust bearings), coupling and turning device of the turbogenerator set. In the static state of the steam turbine unit, the top shaft oil is put into the bottom of each journal to establish a static oil film, holding up the journal, so that the rotating rotor smoothly; When the unit is in normal operation, the lubricating oil should form a stable oil film in the bearing to maintain good rotation of the rotor; At the same time, due to the heat conduction of the rotor, surface friction and oil eddy current will produce a considerable amount of heat, a part of lubricating oil is needed for heat transfer. In addition, lubricating oil also provides a stable and reliable oil source for the security department sleeve and the top shaft oil system, and can also be used as an auxiliary oil supply system for the sealing oil of the generator.
