Purpose. Determination of the potential efficiency of the alternative method of methane production from subaquatic gas hydrate deposits using the emissions of underwater mud volcanoes considering geological and thermodynamic conditions typical for the Black Sea. Methods. Computer modeling of the processes considering changing of the thermodynamic parameters of the supplying fluid within the pipeline and hydrate deposits was carried out on the basis of the Aspen Hysys program, using the Ng and Robinson model to calculate the energy potential of the fluid. Findings. An algorithm for calculating the distance to which a flow of the emissions mud volcano can be delivered with a temperature sufficient to remove sea bed hydrates from thermodynamic equilibrium and release methane has been developed. The schematic technological solution of an alternative method of methane production from gas hydrate deposits were presented by using the energy of emissions of mud volcano (fluid). The collection device for emissions of mud volcano and gas hydrate sea bed deposits were also been used within the model. The calculations have been done using Aspen Hysys computer program. Originality. The potential efficiency of the alternative method of methane production from gas hydrated sea bed deposits using thermal energy from emissions of underwater volcanoes is substantiated. It is also shown that in the case when the hydrate deposits cover the sea bed natural gas deposits as an impermeable layer, the thermal energy of the gas flow extracted from the sea bed natural gas deposits can be used for the decomposition of the hydrates This case is similar to the considered alternative method of using thermal energy of the emissions of mud volcanoes. Practical implications. The use of an alternative method of methane production from gas hydrate sea bed deposits by using emissions of mud volcano make it possible to increase the amount of gas obtained from subaquatic sources ~ by 7-10% without using additional sources of thermal energy. The practical application of this method will also prevent methane emissions from mud volcanoes into the atmosphere, which reduces pollution of seas and oceans with dissolved gases.
A b s t r a c tThe following paper shows results of several studies, carried out with the Earth Energy Designer program (EED3.21). Having used the EED, analyses on efficiency of the heat extraction were conducted, and measurements of productivity were taken in dependence of variable parameters of a theoretical deep coaxial borehole heat exchanger. The depth of 1000 m and the constant heating load 80 MWh per year were assumed for the borehole exchanger. The variables analyzed were: type of the heat carrier fluid, flow rate of the heat carrier, diameter of the borehole, wall thickness of the inner tube (insulation), diameter of the inner tube, thermal conductivity of the inner tube material, wall thickness of the outer tube, diameter of the outer tube and thermal conductivity of the outer tube material. Due to mathematical basis of the EED program, results of the calculations can be considered as diminished. To operate correctly, the program can use parameters from a borehole not deeper than 300 meters. At greater depths of borehole heat exchangers, results are understated. Therefore the results of analyses presented below can be seen as a pessimistic scenario of the calculations.
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