| The number of offshore oil and gas facilities decommissioning projects is increasing significantly,and the market for the decommissioning of marine abandoned platforms in the future is huge.The internal mud discharge device of the pile leg is one of the core equipment for the removal of the abandoned platform,which is of great significance to the rapid and safe removal of the platform.Relying on the high-tech ship scientific research project of the Ministry of Industry and Information Technology,this subject aims to develop a new type of internal leg mud discharge device,and carry out relevant research and analysis on the leg internal mud discharge device.First of all,according to the function and technical requirements of the leg internal mud discharge device,a new design scheme of the leg internal mud discharge device was proposed;Used the modular design method to carry out the analysis and design of each functional module of the leg internal mud discharge device,and completed the structural design and type selection of each module of the leg internal mud discharge device.Based on the theoretical analysis of hydraulic transportation,the basic parameters of each equipment of the hydraulic transportation system were obtained.With the help of fuzzy analytic hierarchy process,the scientific evaluation and selection research of the built-in dredging pump were carried out,and the pump type that best matches the system was selected.Secondly,based on the analysis and research of the basic working principle of the water jet system,the basic characteristic parameters of the water jet were calculated and analyzed with the help of the submerged jet theory,and the basic design parameters of the equipment of the water jet system were obtained.According to the RNG k-ε turbulence model,the computer simulation technology was used to analyze and study the characteristics of the water jet flow field.The law of action of the water jet under different pressures and different jet distances and the change law of the velocity on the jet axis were obtained to guide engineering applications.Then,according to the design scheme of the water level control system in the leg,a mathematical model of the water level control system was built,and the transfer function of the system was determined.Based on the basis of the standard particle swarm algorithm,the dynamic adaptive inertia weight and time factor were introduced to improve it,and the PID parameters of the water level control system were adjusted with the aid of the improved particle swarm algorithm.The adjustment results were combined with the genetic algorithm and the traditional Z-N tuning method.Through comparative analysis,the improved particle swarm algorithm had achieved better optimization results.Finally,on the basis of analyzing and studying the control function requirements of the device,the design of the control system scheme of the device was carried out,and the hardware selection and connection design of the system were completed.Used STEP7-Micro/WIN to develop the control system control program,and used WINCC Flexible to complete the design of human-computer interaction interface.Based on the open test method,a test study of the internal mud discharge device of the pile leg was carried out,and the test data analysis of the device was completed,and the reliability of the device operation was verified. |
