10MW급 해양온도차발전용 라이저의 개념설계

Abstract

The concept design of a riser for Ocean Thermal Energy Conversion of 10 MW is proposed and its dynamic behaviour characteristics is analyzed with numerical method. A riser pipe with a hollow along its thickness in the cross-section to increase the effective modulus of its cross-section is designed considering the manufacture. A riser pipe with a hollow along its thickness needs a lumped mass at the end of a riser in order to maintain its vertical hanging configuration from large buoyancy and strong current. A riser is designed to control its density by inserting materials of high or low density into a hollow. The dynamic behaviour characteristics of the designed riser between risers of a hollow and general cross-section is evaluated with the developed numerical analysis tool. The combined stress of the riser with a hollow is showed to be dominated by weight of a lumped mass. A riser with no hollow shows large combined stress near sea surface by strong current. Local structural analysis for the cross-section of a hollow riser is needed in detail.ncrease the effective modulus of its cross-section is designed considering the manufacture. A riser pipe with a hollow along its thickness needs a lumped mass at the end of a riser in order to maintain its vertical hanging configuration from large buoyancy and strong current. A riser is designed to control its density by inserting materials of high or low density into a hollow. The dynamic behaviour characteristics of the designed riser between risers of a hollow and general cross-section is evaluated with the developed numerical analysis tool. The combined stress of the riser with a hollow is showed to be dominated by weight of a lumped mass. A riser with no hollow shows large combined stress near sea surface by strong current. Local structural analysis for the cross-section of a hollow riser is needed in detail.