Installation, commissioning and decommissioning offshore wind. Marcus Bentin

Transcription

1 Installation, commissioning and decommissioning offshore wind Marcus Bentin

2 Faculty of Maritime Studies Weiter 2

3 Maritime Industry in Germany 3

4 Installation of offshore wind turbines In ,230 offshore wind turbines in the EU (11,027 MW) New installation of 759 offshore wind turbines in the EU (3,019 MW) in 2015 Installation of offshore wind turbines is large market sector Dismantling or repowering after years (by law) 4

5 Installation of offshore wind turbines in Germany 5

6 Installation of offshore wind turbines in Germany 6

7 Commission of Windpark Riffgat in Germany from EWE 7

8 Dismanteling of offshore wind turbines not so much experiences could be gained yet 2016 Yttre Stengrud, Vattenfall (5 turbines each 2 MW) 8

9 Key problem Most wind farms (in Germany) are founded in deep water several seamiles off the coast Long trip for the workers from the coast to the wind farms Often small time windows of good weather As yet no established processes for dismanteling Sometimes not even established laws and regulations 9

10 Key problem 10

11 Key problem 11

12 Principle decommissioning process suggested by Rhenus 12

13 Today proposed methods for decomission The today proposed methods have there roots in the onshore wind sector, offshore oil and gas industry and the experience from the erection process of the offshore wind farms One principle is to do most of the decommission process onshore. The offshore operations are costly and have to be minimized The difference to oil and gas is: there are many smaller sized structures in the field that have to be removed instead of one big platform. Hence the tools might be oversized? the water depth is usualy less than 50m in Germany it can be more the distance to the coast is usualy less than 50 miles, in Germany it can be more 13

14 Today proposed methods for decomission The operations can be clustered for: Wind Turbines lift operations Fundation of Turbines, Substation, Met Mast Cut and lift operations Offshore Substation Lift operation Cables Inter-array/Export Cut and remove or left in situ Onshore Cables, Substation (we do not focus here) e.g. Topham 14

15 Used Literature Eva Topham*, David McMillan: Sustainable decommissioning of an offshore wind farm in Renewable Energy 102 (2017) p Gillian Smith, Chris Garrett & George Gibberd: Logistics and Cost Reduction of Decommissioning Offshore Wind Farms presented at EWEA Offshore March 2015, Copenhagen 15

16 Operations for Turbine First the turbine has to be prepared to decommission, powerless, Cut electric cable Dismantel Nacelle Heavy lift operation around 600t (Rotor and Nacelle) Dismantele rotor from nacelle on the deck of the vessle otherwise it has to be done before? c/story/images/biwf%20tower%201%20complete.jpeg?itok=l n86i6_z 16

17 Operations for Tower and Transition piece /Monopile Most productive way would be lifting Tower and Transition piece together with the foundation Therefore cutting of foundation only from outside Lifting of 1500t and later even more articles/4/image4(1).jpg 17

18 Operations for Fondations /Monopile First the pile has to be inspected (ROVs) Score protection has to be removed for cutting? The effort depends on the protection type Cable has to be cut and burried in ground. (ROV, diver) Excavation with sea trencher Crane hooks are positioned to the lifting points The piles are cut below seabed and have to be monitored afterwards Removing entire structure??? As alternative articles/4/image4(1).jpg 18

19 Operations for Score protection The hope is that it can be left in Situ But today you cannot realy be sure in Germany if the general rule is applied everything has to be left as it was before Argumentation: new marine habitat, removal would distroy the habitat If they have to be moved productive ideas are necessary otherwise it is done with a grapper diver or ROV assistance 19

20 Operations for Cables The hope is that they can be left in Situ If the burial depth of the inter-array and export cable is deeper than 1m. They are cut and removed where they come up less than 1m Cut operation with ROV??? Towed on a drum on board the vessel The buried cables have to monitored during years. 20

21 Operations for Offshore Substations Here know how of the oil and gas industry is available as well as technology. Platforms already have to be removed 21

22 Available Technology for the Operations Cutting technology: Hydraulic shears for cable Abrasive wire cutting or abrasive jet cutting for 80mm and more wall thickness and over 5m diameter 1c e2a02ab1cdea6b797_f792.jpg content/uploads/2013/03/conductor-cut- Pic.jpg 22

23 Available Technology for the Operations Logistic and heavy lift operations: Several offshore vessels from the oil and gas industry Wind park erection vessel, Jack Up Vessels, Heavy Lift Vessels 23

24 Project Idea: Offshore Wind Decommissioning Toolbox for the North Sea Region Project Titel: Eco-innovative concepts for the end of offshore wind energy farms lifecycle Isabel Sünner Interwork Event, Göttingen,

25 Background and Relevance Offshore wind industry mainly focuses on setting up new projects Only little attention is given to decommissioning It is foreseeable that 50 offshore wind farms will need to be dismantled until 2038 Central aim: is to develop new processes and working tools to organize the decommissioning of offshore wind energy parks in an environmentally safe and cost-effective way Hamburg Institute of International Economics (HWWI) Slide 25

26 Aspects to be considered: Economic and legal framework Impact on regional development Impact on environment Requirement profile for new working tools / operations Logistical concepts, including material and personal resources New vessel type Recycling / disposal of components Hamburg Institute of International Economics (HWWI) Slide 26

27 Envisaged output Logistical concepts including material and personal resources (using a model of wind energy plants) Concept for recycling / disposal of particular components Definition of requirements for a new vessel type Environmental and safety analysis of the new tools Exploitation plan for the new tools Impact analysis on regional development Hamburg Institute of International Economics (HWWI) Slide 27

28 Potential partners Business / Industry Partners (from all over the NSR) Cluster organisations in the field of offshore wind (particularly from BE, DK, NL, UK) Please get in contact! Isabel Sünner Hamburg Institute of International Economics (HWWI) International cooperation and project development suenner@hwwi.org Hamburg Institute of International Economics (HWWI) Slide 28

29 Project Partners Confirmed: University of Applied Sciences Emden- Leer, Germany HILOG, Institute for Logistics, Emden, Germany Port of Oostende, Belgium Flanders Maritime Cluster, Belgium HWWI, Germany Energy Valley, Netherlands WPT Winschoten, Netherlands 29

30 Possible fonds Interreg North Sea Region (www. 30