Genbrug af kompositmaterialer fra industrien
Projekt bevilget af Styrelsen for Forskning og Innovation
As a first step of blade decommissioning, the blades typically need to be dismantled from the rest of the wind turbine and cut into smaller sections. Sectioning wind turbine blades can be carried out in several ways, depending on the purpose or use, the local environmental requirements, and the size of the blade. The following is usable for resize / reshape activities.
The method uses a water cooled steel wire with diamond particles/teeth, which is wrapped around the wind turbine blade. The wire can cut all the different blade materials, including wood and steel. Wire cutting can section all sizes of wind turbine blades, only limited by the length of the wire, which can be extended infinitely. The process is relatively environmentally friendly, regarding dust and noise emissions. The cooling water can be recycled and the cuttings can be collected. Additionally, the cuts are relatively smooth and sharp and well defined. The disadvantage is that the method is time consuming and the blade will have to be held firmly during the cutting action in order to avoid pinching of the wire.
Different types and sizes of diamond tipped diamond circular saws can be used for sectioning wind turbine blades. The sizes range from handheld saws to hydraulically driven and controlled saws with blade sizes up to 2 meters in diameter. Depending on the size of the blade, the saws can section all sizes of wind turbine blades, but in most occasions it will be necessary to make several cuts in order to section the blade. This increases the amount of dust/cuttings/emissions that are produced for each section. If done properly, the circular saw will produce relatively fine handling friendly cuts. The circular saw can be combined with different dust collecting systems, either by vacuum or water. The advantage of the circular saw is that it is possible to make independent cuts in all directions. This opens up for the possibility to extract selected materials, like the massive main laminates or balsa for special purposes from the wind turbine blade. Disadvantages are the tough working conditions and potential safety hazards for the operators.
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