Research Of Submarine Pipeline Emergency Recovery Device

Submarine pipeline recovery technology is an important technology to improve the efficiency of submarine waste pipeline recovery,reduce marine environmental pollution and reduce the cost of submarine pipeline laying.Although China's submarine pipeline recovery technology has started,there is still a big gap compared with foreign countries.In order to continue to promote the development of domestic submarine pipeline recovery technology,the emergency recovery device of submarine pipeline is designed and studied on the basis of international research on submarine pipeline recovery devices.Through the detailed analysis of the working conditions of the emergency recovery device of the submarine pipeline,combined with the domestic and foreign pipeline recovery technology,the overall design scheme of the emergency recovery device of the submarine pipeline is determined by using the modular design method.The main insertion mechanism,drainage and pipe cleaner capture mechanism,hydraulic system,deployment arm and tail hoisting mechanism of the emergency recovery device of the submarine pipeline are designed.According to the scheme of the recovery pipeline,the numerical calculation model of the main insertion mechanism is established,and the force to be provided by the hydraulic system and the contact force between the device and the pipeline are determined.The entire operation process of the subsea pipeline emergency recovery device is affected by the design of the hydraulic system and the watertight seal.In order to solve the above problems,according to the working environment of hydraulic system and the driving force to be provided,the scheme of hydraulic system is determined and verified by simulation analysis.According to the requirement of water seal,the mathematical model of the sealing ring is established,and the reliability of the design of the sealing ring is ensured by combining theoretical calculation and nonlinear simulation analysis.Furthermore,based on ANSYS transient dynamic analysis,the strength of inner and outer layer ball cage and bearing ball in the transient process of bearing ball contact pipe in the main insertion mechanism is analyzed to ensure that the structure meets the working requirements.In order to verify the correctness of the numerical calculation model of the main insertion mechanism,the process of expanding and tightening the pipeline of the emergency recovery device of submarine pipeline is analyzed by establishing the mechanical model and dynamic simulation.Dynamic simulation is used to determine the stiffness of the spring when the pipe cleaner capture mechanism is to capture the pipe cleaner.To ensure that the hydraulic system can meet the requirements of device recovery,the interface module based on ADAMS and AMESim software is simulated and analyzed,and the driving force of the interface module and the change curve of piston rod position are obtained.Aiming at the problems of gravity,buoyancy,ocean current and vibration of the emergency recovery device of submarine pipeline in the process of recovery pipeline,the dynamic simulation is used to analyze the recovery pipeline process,and the drag and drop force required in the recovery process is obtained,and the feasibility and stability of the device are also verified.Finally,the contact problem of bearing ball and pipe is deeply studied.By comparing the results of Hertz contact theory and finite element contact simulation,Hertz contact theory is not applicable to the analysis of this contact problem,and the advantages of using bearing ball to tighten pipe are clarified.To provide theoretical basis for bearing ball surface hardening.Aiming at the contact problem of bearing ball and pipeline defect area,a mathematical model of contact force is established.By comparing the test data with the simulation results,the correctness of the finite element contact simulation analysis is verified,the feasibility of the expansion and tightening method is further clarified.In this paper,the research of emergency recovery device of submarine pipeline are completed by combining theoretical research with experimental research,which lays a foundation for the prototype design of emergency recovery device of submarine pipeline.