DK201600646A1

DK201600646A1 - New concept for offshore wind turbine foundations and towers

Info

Publication number: DK201600646A1
Application number: DKPA201600646A
Authority: DK
Inventors: Jørgen Sundt Mikkelsen
Original assignee: Mikkelsen Joergen Sundt
Priority date: 2016-10-18
Filing date: 2016-10-18
Publication date: 2018-05-28

Abstract

Vindmølle tårne og fundamenterer/substations laves med: Indvendige finner der styrker stivheden med X8. Dette for at nedbringe størrelsen af tørne og fundamenter/substations(er havvindmøllers fundamenter) Finnerne skal forlænges fra den nederste sektion op fordi vindmølle tårne er koniske som et omvendt kræmmerhus. Disse finner (strongbacks) bruges som sammenkobling mellem sektionerne og starter fra fundamenter/substations. Man kan nu bruge højstyrke stål selvom det har samme E modul for at øge styrken fordi man har stivheden fra finnerne. Svejsning af finner til svøb skal foregå med Lazer MIG fordi det er præcist foregår med robot og giver lille deformation.Wind turbine towers and foundations / substations are made with: Internal fins that strengthen the stiffness with the X8. This is to reduce the size of dry and foundations / substations (are the foundations of offshore wind turbines) The fins need to be extended from the lower section up because wind turbine towers are tapered like an inverted crematorium housing. These fins (strongbacks) are used as interconnections between sections and start from foundations / substations. You can now use high strength steel even if it has the same E module to increase the strength because of the stiffness of the fins. Welding fins for wrapping should be done with Lazer MIG because it is precisely done with robot and gives little deformation.

Description

Wind turbines are growing

New consept for offshore wind turbine foundations and towers A way to meet the challenge, keeping an eye on costs.

Foundations and Towers has to withstand bigger and bigger loads.

Rotor Diameter is now 180 m, needs high towers

Due to assembly method, the base diameter is growing to meet stability demants.

I Therefore suggest to start at the foundations, doing internal strongbacks

The strongbacks are extended to reach up into first section of tower, The assembly rings is not needed as holes/bolts in the strongbacks joins the tower. Making a double layer and makes a continues reinforcement.

Wind Turbine Towers are conical, this means, strongbacks will have to extend from the tower part beneath the one being mounted.

At the top of the tower, where the yaw bearing shall be installed, a welcomed reinforcement is needed due to bigger wind turbines. • I therefore suggest to use the strongbacks extending inverts in tower to weld the yaw bearing base on to, giving a much broader rim.

E module and strength • As the E module is equal in all ferritic materials, the use of high strength steel is on standard wind turbine towers inapplicable. • BUT this Magmax tower will benefit from QT steel, due to the huge stiffening by the strongbacks • QT steel has some issues, specially in heat treatment, this is why the standard welding method by SAW giving a huge heat input, broad HAZ and much distortion cannot be used. • The welding method Magmax recommend is Lazer MAG, as it gives deep penetration, narrow weld zone and gives the possibility to add a welding consumable for the purpose • The Lazer MAG has to be fully automated due to reflections ea. And repeatability/ verifiability.

The flanges for assembly of wind turbine towers • The standard method by assembling the foundation and tower parts by flanges has several draw backs. • 1: It creates a horizontal fracture line with only bolts or assembly between flange and tower body • 2: The availability of especially lower flanges is low as they demand big milling machines, huge plates and sometimes they are welded together which gives week spots. • 3: The bigger wind turbines will demand bigger diameter and the prize will be astronomical and compromise the pay back time. • The Patented Magmax solution do NOT need flanges, can be made in smaller diameter which hugely will benefit the pay back time.

Claims

1: indvendige finner der styrker stlvbeden med X8. Dette for al nedbringe størrelsen a; tårne og fundamenier/substaiions(er hav vindmøllers fundamenter)1: Internal fins which strengthen the dustbeds with X8. This for all reduce the size a; towers and foundations / substaiions (are sea wind turbine foundations)

2: Finnerne skal forlænges fra den nederste sektion op fordi vindmølle tårne er koniske som el omvendt kræmmerhus. Disse finner (strongbacks) bruges som sammenkobling meilem sektionerne og starter fra fundament er/substations. Man kan nu bruge højstyrke stål selvom det har samme E modul for at øge styrken fordi man har stivheden fra finnerne. Svejsning af finner til svøb ska! foregå med Laøer Mi G fordi det er præcist foregår med robot og giver lille deformation.2: The fins need to be extended from the lower section up because the wind turbine towers are tapered like electric reverse cage housing. These fins (strongbacks) are used as interconnection between sections and start from foundation er / substations. You can now use high strength steel even if it has the same E module to increase the strength because of the stiffness of the fins. Welding fins for wrapping ska! take place with Lae Mi Mi G because it is precisely with robot and gives little deformation.

3: De indvendige strongbacks bruges i top sektion af mølletårnet til at støtte krøjekransen hvorpå nacellen drejer.3: The inner strongbacks are used in the top section of the turbine tower to support the warp on which the nacelle turns.