China’ longest
wind blade was demolded recently in Lian Yungang, Jiangsu Province. It was
designed for 6.0 MW rotors. 75 meters in length, it answered market requirement
for big-sized blades, proving China has secured most advanced technology in
blade design and manufacturing. Given a name LZ75-6.0, it was supposed to
greatly boost China’s off-shore wind market.
This new type
tried both glass fiber and carbon fiber at the beginning as the only reinforced
material for the main spar. By various tests and assessment, advantages and
disadvantages of both materials were clarified before carbon fiber was finally
chosen to achieve the most optimized structure design.
The research team
also carefully studied a good amount of cases home and abroad in carbon fiber
blade manufacturing. Also by various tests and assessment, they came up with
quite a few patent-pending technological innovations. Cost was cut down for the
benefit of scale application.