02 九 10 Foreign wind turbines blade manufacturing technology trends
Depend on the completion of wind turbines, including supporting the FRP composite turbine blades is an important component of its wind power equipment, the total cost of about 20%. Blade design, material selection and decision process is wind power generators device performance and power of the main factors, and the unit cost of wind power. Around the world blade technology trends, taking into account fan efficiency and reduce costs of two factors, positive large-scale production of leaf development. Single larger power, the cost per KW of power on the lower. Therefore, the global wind power equipment to the MW power and long blade direction of development. LM typical Danish wind power company is the world’s largest group, with 25 years of production experience. The leaves of up to 7000 or more per month, has set up factories in Tianjin, China. LM is the only company with In-House testing capabilities the company can focus on its blade Full-Scale test, all the leaves of the new design can be run through the 20-year state test to be allowed to put into production. These tests include static, dynamic, lightning testing, the test equipment in the laser scanner, more blades provide accurate geometric data. LM’s current production of the longest leaves of 61.5m, is the world’s longest leaves, weight of 17.7 tons, is made of glass fiber reinforced epoxy composites, using carbon fiber blade tip, etc., have been installed by the company in Finland REpower 5MW sea fan. LM blade manufacturing technology companies, including multi-function mechanical hand laid fiberglass to enhance the progress of 25% paved; in force on the bolt support innovation, increase of 20% of the length of the blade; by RIM method to shorten the time 15-20% resin infiltration; to FRP mold to replace steel, low cost. Can be considered, LM megawatt-class blade design, manufacturing technology is the world’s most advanced and most competitive.
In the blade design, LM 10 years ago, the company also introduced a new concept of elastic deflection of the leaf, referred to as pre-curved blades. The curved blade at the tip part of the field, so that leaves turning state, even in the strong wind when the body can maintain a certain distance with the tower to avoid the blades hit the tower. Pre-curved blades because of their large quantity permitted bending rigidity rather, thereby reducing material usage, weight, and for more wind energy. According to the parties concerned, such a pre-curved blade, compared with the standard blade, the wind field at 2.6m / s wind speed, you can start. LM designed this pre-curved blade in 2004, applied for a patent in China. It is understood, LM, GE collaboration with the project to increase capacity on the development of extended case studies of leaf determination. GE, with a 40.3m long 1.5MW blade replaced the original fan blade on the 37.5m long, the results indicate the power output increased by 7%, The reason is the cylindrical area ratio of the inner circle sweep wind swept wind area increased by 14.8% .
To reduce electricity costs, in addition to blade design, the materials and processes shaping each passing day, through the materials and processes to achieve light weight and functional options to enhance the effectiveness of wind energy. Blade manufacture is usually completed through five steps: Split leaf blade shell beam → → → curing heat-curing adhesive assembly → from the mold polishing treatment after the renovation. From 1992 to 1999, the European wind generator single average power 200 ~ 700kw, leaf length from 12m ~ 22m. 2000, the single power to 900kw, blade length of 25m. Two years from the 1 ~ 2.0MW single power over the development of leaf length to 40m, the current research is moving in 3-5MW, leaf length to 50 ~ 60m forward.
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