The wind power industry is mainly composed of upstream raw material production, midstream parts manufacturing and wind turbine manufacturing, as well as downstream wind farm operation and power grid operation. Wind turbine is mainly composed of impeller, engine room and tower. Since the tower is generally subject to separate bidding during the bidding of wind farm, the wind turbine refers to the impeller and engine room at this time. The impeller of the fan is responsible for converting wind energy into mechanical energy. It is composed of blades, hub and fairing. The blades convert the kinetic energy of air into mechanical energy of blades and main shaft, and then into electrical energy through the generator. The size and shape of the blade directly determine the energy conversion efficiency, as well as the unit power and performance. Therefore, the wind turbine blade is in the core position in the wind turbine design.
The cost of wind power blades accounts for 20% – 30% of the total cost of the whole wind power generation system. The construction cost of wind farm can be divided into equipment cost, installation cost, construction engineering and other costs. Taking a 50MW wind farm as an example, about 70% of the cost comes from equipment cost; 94% of the equipment cost comes from power generation equipment; 80% of the cost of power generation equipment comes from the cost of wind turbine and 17% from the cost of tower.
According to this calculation, the cost of wind turbine accounts for about 51% of the total investment of the power station, and the cost of tower accounts for about 11% of the total investment. The purchase cost of both is the main cost of wind farm construction. Wind power blades shall have the characteristics of large size, complex shape, high accuracy requirements, uniform mass distribution and good weather resistance. At present, the annual market scale of wind power blades is about 15-20 billion yuan.
At present, 80% of the blade cost comes from raw materials, of which the total proportion of reinforcing fiber, core material, matrix resin and adhesive exceeds 85% of the total cost price, the proportion of reinforcing fiber and matrix resin exceeds 60%, and the proportion of adhesive and core material exceeds 10%. Matrix resin is the material “inclusion” of the whole blade, which wraps fiber material and core material. The amount of wrapped material actually determines the amount of matrix material, that is, fiber material.
With the increasing demand of the market for the utilization efficiency of wind power blades, the development of wind power blades to large-scale has become an inevitable trend. Under the same length of blades, the weight of blades using glass fiber as reinforcement is significantly greater than that using carbon fiber as reinforcement, which affects the operation performance and conversion efficiency of wind turbines.
Post time: Jul-27-2021