Study Of Kinetics Experiment And Mechanics-Chemistry Coupling Analysis Model For Hydrate Formation

It has been 200 years for the hydrat studies so far, and the research directiones mainly concentrate on the study and application of the formation and inhibition mechanism. Its direct purpose is to get a more economical and effective formation or inhibition conditions .After the revolutionized success get in research of the inhibition, the chief problem turns to be the optimization of formation conditions. It has inevitably become the most important aspect for the hydrate research to study the affection of macroscopically kinetics conditions and the micro-mechanics in the coupling process of mechanics and chemistry to optimize the outer condition in hydrate formation process.This thesis deals with the effect of the macro kinetics parameters in the process of hydrate nucleation and growth based on the crystal nucleation theories and classic kinetics model of hydrate formation in the new spraying system, including temperature, pressure, surfactant and gas-water mixing mode, then analyzes the microcosTnic mechanism in formation process under the gas-water clusters nucleation theory proposed by Sloan E.D. in accordance with experiments. Researches show that pressure is the key factor that affects the formation of hydrate, and that under-cooling and over-pressure help to accelerate the nucleation of hydrate. Surfactant and gas-water mixing mode contribute to the enhancement of velocity of hydrate formation and reduce the energy consuming in the same time. Experiments show that the new atomization system enhances both the formation velocity and gas capacitycompared with the traditional stirring system.Under the theory of the crystal growth and with the relevant experimental data, this thesis establishes a hydrate growth mechanics- chemistry coupling calculation model in the atomization condition. Comprehensively considering the coupling mechanism of hydrate growth chemistry reaction process as well as the mechanics interactive mechanism between gas and liquid in the environment of low temperature and high pressure, the paper also thinks thoroughly about the microcosmic effects of the atomizing manners, super-saturation, mass transfer condition and different nucleation manners in the hydrate growth process. Finally, establishes a mathematically associated formula which precisely illustrates the relationship between the hydrate crystal growth and the consumption of water and gas. It is believed that the formula can be a reference to the microcosmic mechanism study of hydrate growth in the atomization condition.The thesis also makes a feasibility study for the application of hydrate technology to coal bed methane on the foundation of experiment result. An industrial process is designed for a coal bed methane well of an output ranging from 6000 to 8000m3/d with suited main facilities, meanwhile calculates the industrial energy consuming. Compared with LNG in the investment and operation expenditure, the hydrate gas storage technology has the advantage in investment, operation security and gas storage density. It will bring considerable profits to apply this technology to the exploitation of coal bed methane and the disposal of mine gas.