According to the experience of countries and regions with early wind energy development, generally after 3-5 years of operation, the transmission mechanical part of wind turbines begins to enter a period of frequent failures, and key components such as gearboxes begin to have problems of varying degrees.

This paper introduces and explains in detail the various pollutions and hazards of the lubricating oil in the gear box, which is a key component of the fan and is also a component with a high failure rate, and proposes a simple, economical and effective control solution The scheme can be used as a reference for power generation companies and equipment manufacturers to improve the utilization rate of power generation equipment and reduce downtime and maintenance costs.

1. About wind turbine gearbox lubrication The speed-increasing gearbox is the main transmission part of the wind turbine, which is used to increase the speed of the impeller.

At present, the main manufacturers of speed-up gearboxes for wind power generation are Winergy, Hansen, Moventas, etc. The manufacturers in our country are Nanjing High-speed Gearbox Factory, Chongqing Gearbox Factory, Dalian Heavy Industry Reducer Factory, etc.

Since wind turbines are mostly installed in remote, open, and windy areas, such as Xinjiang, Inner Mongolia, and coastal areas in my country, the working environment of the gearbox is high and low temperature changes, high humidity, and the wind turbines are located in relatively remote areas. The cost of repair or replacement is huge, so the design requires that the gearbox must have extremely high operational stability and reliability. Pollutants such as particles, moisture and oxidation products are harmful to the oil and the equipment itself, and will greatly increase the risk of fatigue and wear failure of gears and bearings.

Once the gearbox needs to be repaired or replaced, the cost of repairs and accessories will be high, coupled with the use of large-scale equipment and the loss of power generation caused by incalculable downtime, the cost will be quite staggering for both the OEM and the owner.

2. The main pollution of gear lubricating oil for wind turbines: including particulate matter, water, and oxidized pollutants. AGMA (American Gearbox Manufacturers Association) and ISO/IEC (International Standards Committee/International Electrotechnical Association) standards also have the same requirements for wind power gearbox lubricants.

Generally, a set of online filters are attached to the online lubrication system of the fan gearbox, and the filtration accuracy of this filter is mostly 10-50µm. In fact, although the online filter protects the lubrication system very well and plays the role of cleaning the oil system, according to the experience and sampling inspections of the wind farm owners for many years, it cannot fully meet the requirements of the wind turbine gearbox for the cleaning of the lubricating oil. degree requirements and related standards. A large number of tiny particles cannot be effectively removed, which is a potential threat to the demanding wind turbine gearbox.