Research On Temperature Control Method Of Non-diagenetic NGH Sampler Based On Microwave

As an emerging unconventional energy source,natural gas hydrate(NGH)has received extensive attention from the international community.Recently,the "Non-Rocking Gas Hydrate Solid State Fluidized Extraction Laboratory" built in our school is urgently needed in the simulation of marine NGH development experiments.Raise the temperature of the test medium in the NGH sampler and stabilize it.On the basis of extensive research,this paper proposes an NGH temperature control method and overall scheme based on microwave thermal effect,and constructs a microwave experimental device with controllable power and adjustable parameters.The magnetron and NGH sampler are used to realize the parameter control of the microwave field in the local area;the high-frequency electromagnetic simulation software HFSS is used to numerically simulate the distribution of the microwave field inside the sampler when the two magnetrons work at different position parameters.Analyze and explore the internal connection between the test medium(using NGH alternative medium:ice,water and ice water mixture)and the microwave field in the sampler;use the experimental device to complete the heating and temperature of the test medium in the sampler with variable parameter magnetron.Distribution and other experimental studies;numerical simulation analysis and experimental results show that the intensity of the microwave field in the central region of the sampler is higher than that of the round periphery and the liquefaction rate of the test medium begins to liquefy;the liquefaction speed is significantly faster;and the position of the microwave waveguide mouth relative sampler is changed.The parameters can change the microwave field distribution and heating rate inside the sampler.The numerical simulation of the paper and the results of a series of microwave heating experiments verify that the proposed research method is correct and feasible.The microwave test device has reached the design index requirements,providing an experimental research method for the further practical device development and exploration of the non-diagenetic NGH phase transformation law.The results of the paper need to be further improved,but the practical application prospects will be very broad.