| Natural gas hydrate(NGH)has been regarded as an alternative energy source for traditional fossil energy such as coal and petroleum.It has abundant reserves in the world,but it is difficult to develop.At present,it has not fundamentally solved the safety problems such as geological risks,environmental risks and production equipment.Therefore,the commercial mining technology of all countries in the world is in the stage of deep scientific exploration.In order to solve the various technical problems faced by non-diagenetic NGH commercial development,it is urgent to establish a large-scale scientific research and testing platform.The marine non-diagenetic gas hydrate solid-state fluidized mining laboratory independently researched,designed,constructed and constructed by Chinese scientific research units will become an important equipment for scientific research on marine non-diagenetic NGH development.The core equipment of the laboratory is the NGH preparation kettle system simulating the seabed high pressure and low temperature state.In order to monitor whether the NGH sample generated in the preparation kettle meets the test conditions of the simulated mining technology,it is necessary to take the NGH sample from the preparation kettle according to the process requirements,so the research on the sampling device of high pressure and the low temperature preparation kettle has become a top priority.Based on extensive research,this paper proposes an NGH sampling device based on magnetic coupling drive and electronically controlled drive fusion based on the concept of organic combination of electromechanical instruments.According to the actual parameters of the NGH preparation kettle,the design technical indicators of the sampling device were determined.The overall scheme design,hardware structure design,software programming and simulation of the device were completed.The SolidWorks design,machining and device selection of the drive,connection and sampling head structure were completed.Type and analysis,assembly and commissioning work;control circuit design,Smith predictive compensation fuzzy PID control algorithm for pressure,pressure regulation and pressure relief control of the pressure inside the sampling pressure tube,and simulation experiments were carried out by Matlab software.Through the indoor simulation experiment of the principle machine of the sampling device,it is verified that the research results of the paper are correct,the structure is reasonable,and it has certain innovation and practicability,which provides technical support for the practical NGH sampler in the future. |
