Wind turbine blade and icing preventing and removing method

Abstract

The invention relates to a wind turbine blade and an icing preventing and removing method. The wind turbine blade comprises a blade shell which is formed by a blade shell sandwich upper layer, a middle layer and a surface layer from inside to outside; the wind turbine blade is characterized in that a windward side and a lee side of the surface layer of the blade shell are each provided with a plurality of heating resistance wires paving paved in the height direction of the blade, and a heating resistance wire distributing layer iss are formed, and a coating is then paved on each heating resistance wire distributing layer; bus bars are arranged at the edge of the outline of the blade, the multiple heating resistance wires are connected with the bus bars at the edge of the outline of the blade, the two ends of each bus bar are connected with two binding posts at the root of the blade, and the bus bars are connected with an external power supply circuit through the binding posts; and the overall blade is divided into two parts including a blade front edge and a blade back middle part, the length ratio of the blade front edge to the blade back middle part is 1:(1.2-1.5), the number of the heating resistance wires at the front edge of the blade is two to three times that of the heating resistance wires at the blade back middle part, and the lengths of all heating resistance wires are different.

Description

technical field [0001] The invention relates to a blade of a wind turbine and an anti-icing and de-icing method. Background technique [0002] Wind power generation is an effective way to solve energy shortages, and my country is rich in wind energy resources. However, wind resources are often distributed in harsh environments, such as alpine regions and humid coastal regions. Because the temperature is often close to zero degrees Celsius and accompanied by high humidity, fan blades are more likely to be covered with ice. With the formation of icing, it will bring many problems: after the blade is iced, it will cause the wind turbine to shut down and alarm, and it is very difficult to carry out maintenance in such a harsh environment; the icing of the fan will affect the aerodynamic profile of the fan blade , During the operation of the fan, the load increases and the vibration is obvious, which reduces the service life of the fan; after the fan blades are covered with ice...

AI Technical Summary

Problems solved by technology

With the formation of icing, it will bring many problems: after the blade is iced, it will cause the wind turbine to shut down and alarm, and it is very difficult to carry out maintenance in such a harsh environment; the icing of the fan will affect the aerodynamic profile of the fan blade , during the operation of the fan, the load increases and the vibration is obvious, which reduces the service life of the fan; after the fan blades are covered with ice, the load and output of the wind turbine are affected, and the output power of the wind turbine is reduced

Its disadvantage is that there are many microwave heater components inside the blade, and the installation is difficult. If the installation is not in place, the balance of the unit will be affected when the blade rotates at high speed, and the internal structure of the blade changes greatly, and new equipment More, greatly increasing the failure rate of blades and the difficulty of repairing internal faults of blades

[0004] Shu Lichun et al. (DOI: 10.13334 / j.0258‐8013.pcsee.161106) published in the Chinese Journal of Electrical Engineering in 2016 "Tests on electric heating and deicing of fan blades and the arrangement of resistance wires" mentioned the arrangement of resistance wires The way is that the resistance wires at the tip of the blades are arranged in the chord direction, and the resistance wires at the root are arranged in the span direction. The disadvantage is that the temperature of the blades fluctuates with time due to the continuous on-off heating of the resistance wires, which will accelerate the speed of wind turbine blades. In addition, due to the uniform distribution of resistance wires in the blades, the overall heat distribution of the blades is uneven, and the heating and heat dissipation during the resistance wire on-off process is not timely, which will cause changes in the shape of the fan blades

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