Klymenko V. Scientific and technical principles of gas hydrate technologies (thermodynamics, kinetics, circuit designs)

The dissertation is devoted to development of scientific and technical fundamentals of the gas hydrate technology. In the work the results of experimental and theoretical investigations of both thermodynamics and kinetics of complex interconnected processes in relation to that technology, such as formations and fusion gas hydrate(GH) and ice-gas hydrate capsules (IGHC), are presented. On the basis of the theory of solutions an advanced technique for calculations of thermodynamic characteristics of the GH formation process with using phase balance data is proposed. Physical models of formation and fusion of GH and IGHC have been developed as applied to analysis of the obtained experimental results on kinetics of these processes. On the basis of the local turbulence hypothesis with using the results of the experimental and modeling investigations a new design procedure for calculation of convective heat transfer processes with regard to formation and fusion GH at mechanical agitation has been proposed and tested in this study. It has been proved the expediency of the use of the water- hydrate suspension as an effective coolant in the "moderate cold" technique. New circuit decisions of gas hydrates and IGHC technological application. With reference to information obtained in this study a model sample of the gas hydrate accumulator of natural cold was developed, which has successfully passed industrial testing as a structure of the cooling system for beet piles.The final results of this study are represented in the form of recommendations, design techniques and calculated formulae, which are expected to be necessary and useful while designing the basic processes and devices for gas hydrate technologies with account for essential problems of energy-and resource conservation.