Air layer anti-icing and de-icing system based on air heat de-icing technology and design method of air layer anti-icing and de-icing system

Abstract

The invention discloses an air layer anti-icing and de-icing system based on an air heat de-icing technology and a design method of the air layer anti-icing and de-icing system, and belongs to the technical field of wind power generation. The air layer anti-icing and de-icing system comprises a hot air generation and circulation system, a first ventilation pipe, a wind shield, a first exhaust pipe, an induced draft fan, a second ventilation pipe, a third ventilation pipe, a connecting air pipe, a fourth ventilation pipe, a backflow baffle, a second exhaust pipe and a third exhaust pipe. Hot air flow channels between web plates and between the web plates and the front edge / the rear edge of a blade are closed through the wind shield and the backflow baffle, and part of backflow hot air is extracted, sprayed out through hot air spraying holes and wrapped by incoming air flow to form a hot air thin layer on the outer surface of the blade. Heating and heat preservation of the outer surface of the fan blade are facilitated, heat transfer between the surface of the blade at the middle section and the atmosphere is slowed down / restrained, supercooled water drops penetrate through the thin layer to fall on the blade and are not prone to forming ice coating, and therefore the effective auxiliary anti-icing and de-icing effect is achieved on the blade middle section where the blade heating efficiency of hot blast is not ideal due to the large thickness.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to an air layer anti-icing system based on gas-thermal deicing technology and a design method thereof. Background technique [0002] In wind farms in low wind speed areas and some high wind speed areas in the south, severe freezing problems generally exist in winter and spring. Icing on the blades of wind turbines will change the aerodynamic shape and weight distribution of the blades, break the load balance of the blades, and cause problems such as vibration of the blades and wind rotors, which will have a direct impact on the economy and safety of the unit operation and power production. [0003] Air-thermal deicing technology is a relatively common deicing method for wind turbine blades at this stage. Hot air is passed into the interior of the blades to heat the surface of the blades, so that supercooled water droplets are not easy to freeze on the surfa...

AI Technical Summary

Problems solved by technology

[0004] In fact, wind turbines are in a climate and terrain environment that is prone to freezing. When the blades are seriously icing, when the air-heat deicing operation is performed, the entire long fan blades cannot achieve uniform deicing effect, that is, when the blades are close to the thermal airflow When the outlet part of the delivery pipe and the blade tip can be effectively deiced, the middle section of the long blade is thicker, and the hot air flow that it contacts has already heated the blade part downstream of the air delivery pipe, resulting in a drop in airflow temperature, making the middle section of the blade Thick blades cannot be heated effectively, and may not be able to achieve the same deicing effect as the tip of the blade, and the formation and development of ice coating will occur, which will have adverse effects

Images