Print Email Facebook Twitter Concept Design for a Rock Handling System Title Concept Design for a Rock Handling System: Feeding the Inclined Fall Pipe System aboard the Multipurpose Vessel 'Living Stone' Author van Etten, Marc (TU Delft Mechanical, Maritime and Materials Engineering; TU Delft Marine and Transport Technology) Contributor Schott, D.L. (mentor) Miedema, S.A. (mentor) van den Bos, W. (mentor) Visser, C (mentor) de Haan, J (mentor) Degree granting institution Delft University of Technology Date 2017-06-22 Abstract Erosion of the seabed around offshore structures, due to current and waves, is a common occurrence.Scour protection by rock placement can be done in order to limit erosion and its consequences. TidewayOffshore Solutions will use the multipurpose vessel ’Living Stone’ to execute such rock placementoperations. Aboard the Living Stone a newly designed inclined fall pipe system will be installed totransfer the rocks through shallow and possibly high current water towards the seabed. The goal ofthis thesis is to design a concept of a rock handling system to feed the inclined fall pipe system aboardof the Living Stone. The concept requires to be capable of handling armourstone with gradings up to60-300kg and continuous mass flows up to — tonnes per hour.With the use of the VDI 2221 design cycle the function, principle and solution structures were createdto realise a morphological overview. Multiple concepts were created and evaluated on criteriaincluding the maximum allowance of peak production, proven technology, maximum solvability, minimumrequired space and minimum costs. Thereafter, a preliminary layout was created for the conceptranked highest. In order to be sure the concept is capable of generating the demanded mass flows interms of capacity and accuracy, discrete element modelling was used. With the use of EDEM-softwarethe performance of the in Solidworks created model was studied. After calibration of the simulated material,the performance of the concept was studied by varying the outlet area and the feeders’ velocity.This resulted in the associated mass flows and their fluctuations. The accuracy of the mass flow wasdefined as a percentage of the mass flow in which the flow fluctuated.The configuration was studied and set for further simulations, using Box-Behnken design of experimentsand Minitab-software. The mass flow, depending on the installed shear height and the velocityof the feeder, was validated with empirical theory for apron feeders. This work demonstrated that theratio between the outlet area, defined as the outlet diameter but realised by the shear height and feederwidth, and the maximum particle diameter is of great influence on the mass flow. The smaller the ratio,due to an increase of particle size and/or decrease in outlet area, the less accuracy of the simulatedmass flow. The difference between the simulated and theoretical mass flow increases exponential withthe decrease of the ratio between outlet diameter and maximum particle diameter. To reference this document use: http://resolver.tudelft.nl/uuid:7a608006-7bdb-46a6-886d-b33c64387684 Embargo date 2022-06-22 Part of collection Student theses Document type master thesis Rights © 2017 Marc van Etten Files PDF Thesis_report_Marc_van_Etten.pdf 15.44 MB Close viewer /islandora/object/uuid:7a608006-7bdb-46a6-886d-b33c64387684/datastream/OBJ/view