Research And Manufacture Of Auxiliary Anode For The Foundation Of Offshore Wind Power

Offshore wind energy has the advantages of abundant resources and stable wind speed.In recent years,China has made great efforts to develop offshore wind energy,and more and more offshore wind farms have emerged in the offshore areas of coastal provinces.In the construction of offshore wind farm,the foundation of offshore wind power is an important part of offshore wind farm.The foundation of offshore wind power has the characteristics of large investment,long service life,harsh environment and high maintenance difficulty.Therefore,it is necessary to carry out anti-corrosion design for the foundation structure of offshore fan.At present,the cathodic protection method of sacrificial anode is mainly used for the foundation of offshore wind power.However,with the increase of the operation life of the offshore wind farm,the sacrificial anode will be gradually consumed,and the sacrificial anode will be excessively consumed under abnormal sea conditions,resulting in the reduction of cathodic protection effect or even no effective cathodic protection of the offshore wind turbine foundation in the later stage of operation.In addition,it is difficult to completely protect the foundation of offshore fan in the deep sea mud area by using the SACP method.Compared with SACP,ICCP has stable performance and controllable cathodic protection current.This paper mainly studies the auxiliary anode suitable for the foundation of offshore wind power in ICCP system.Auxiliary anode is the key component of ICCP system.This paper will study from three aspects: electrode material,packaging material and structural design of auxiliary anode.Through the investigation of various auxiliary anode electrode materials,the titanium based iridium tantalum oxide electrode is selected as the auxiliary anode electrode material for the foundation of offshore wind power.The adhesion strength of metal oxide layer,thickness of metal oxide layer,constant current polarization potential under rated current density and strengthening life of auxiliary anode of titanium based iridium tantalum oxide electrode are tested.The test results verify the reliability of titanium based iridium tantalum oxide electrode.GFRP was selected as the packaging material of auxiliary anode.Through investigation,acid resistant glass fiber was selected as the fiber reinforcement of GFRP,and vinyl ester resin was selected as the resin matrix of GFRP.The bending strength,permeability,aging resistance and bonding strength of GFRP specimens with acid resistant glass fiber and vinyl ester resin as raw materials were tested,The test results show that the properties of GFRP specimens are good.The structure of auxiliary anode suitable for the foundation of offshore wind power is designed by combining with the environment of the foundation of offshore wind power and the surrounding environment of auxiliary anode operation.The auxiliary anode is composed of auxiliary anode electrode,anode insulation seat and auxiliary anode installation back plate,which are closely integrated by anode insulation seat through pin structure.The auxiliary anode is processed by hand pasting process,and the water tightness and insulation of the auxiliary anode were tested.The test results show that the water tightness and insulation of the auxiliary anode meet the engineering requirements.