The spotlight is firmly on the uptake of clean energy sources as the government aims to increase its share of renewable energy in its energy mix from 11% to 41% by 2030. This means the deployment of 11.8 GW of large-scale renewable energy capacity, translating into significant opportunities for both investors and Inde-pendent Power Producers (IPPs).
Despite South Africa having some of the best solar and wind energy resources in the world, these only make up about 8% of the country’s energy mix at present. Solar and wind plants can be constructed in a two-year timeframe and have very low running costs.
Modern wind power plants must have the highest possible effectiveness to generate electricity efficiently. Optimum design of the machine elements is required to achieve this over a plant lifetime often exceeding 20 years. Minimising friction in the entire system is critical, but avoiding wear is even more important. Once the moving components such as roller bearings or gear wheels show initial signs of wear, this is irreversible, with a dramatic impact on the service life of components.
In particular, the pitch and yaw bearings in wind power plants are subject to high requirements from a tribo-logical point of view due to the adverse environmental conditions. Conventional greases do not provide ad-equate wear protection in this instance. The use of solid lubricants has proven to be effective in isolating running surfaces and rolling elements from one another during static and mixed friction phases, thus pre-venting wear. Due to their high physio-mechanical pressure resistance, these solid lubricants, unlike oils and simple greases, remain between and isolate the surfaces of the components, even under high surface pres-sures.
Through many years of research activities involving close partners from the wind power industry, FUCHS has succeeded in developing a special mixture of reactive white solid lubricants. Triggered by the action of a de-fined load, the white solid lubricants form a protective reactive layer on the contact surfaces. This reactive layer reduces friction and above all the wear of the components of the roller bearing.
When it comes to the maintenance of wind power plants, FUCHS offers a full range of special lubricants. “Whether in hot, cold, dry, or aggressive saline environments – wherever wind power stations generate energy – we do everything to ensure that no energy is lost unnecessarily,” comments Ernst Bekker, Special-ist Technical Sales, Lubritech Division.
“We have developed specialty lubricants for this purpose which clearly contribute to reducing the wear on equipment and thus significantly reduce your maintenance effort and expenditure, all for ideally smooth generation with no loss of energy and with optimal frictional wear protection,” adds Giles Cutter, Export Divisional Manager.
For pitch and yaw bearings, GLEITMO 585 K is a well-proven, fully synthetic special lubricant containing reac-tive white solid lubricants. This synergistic combination offers excellent protection against wear, even under critical operation conditions like vibration and small oscillations under high load, which are typical for pitch and yaw bearings in wind turbines. It is also ideal for gear lubrication of pitch and yaw bearings using lubrica-tion pinions.
STABYL LX 460 SYN is a fully synthetic high-performance grease developed especially for use in wind tur-bines. Due to its wide operating temperature range, high mechanical stability, and outstanding load-carrying capacity, this grease is ideal for the lubrication of the main rotor bearings. Moreover, it can also be used as a multifunctional grease in the demanding lubricating areas of azimuth and pitch bearings due to its special properties.
CEPLATTYN BL WHITE is a white adhesive lubricant with reactive solid lubricants. It is used as a lubricant for machines and machine components operating under difficult conditions and subject to extreme tempera-ture fluctuations and environmental influences. A specialised application is the lubrication of azimuth and pitch gear rings in wind turbines.
URETHYN XHD 2 is a soft lubricating grease with a synthetic hydrocarbon base oil and a very temperature-resistant polyurea thickener. A selected additive package provides excellent wear protection, even at fluctu-ating speeds, temperatures, and loads.
REFERENCES
‘Key Renewable Energy Market Drivers in South Africa in 2022’ (18 July 2022)
https://energycapitalpower.com/renewable-energy-drivers-south-africa/
‘How much solar and wind power South Africa needs to avoid Stage 6 load-shedding’ (16 July 2022)
https://mybroadband.co.za/news/energy/452848-how-much-solar-and-wind-power-south-africa-needs-to-avoid-stage-6-load-shedding.html
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