Abstract
The article proposes to using Ocean Thermal Energy Conversion (OTEC) to increase the energy efficiency mining of methane from deposits subaquatic gas hydrates on the gas hydrate cycle (GHET), that will allow not to spend 10-15% of the extracted methane for power supply of a gas-producing complex (GPC). The circuit-technological solution GPC is described, according to which carbon dioxide is introduced into the gas hydrate layer to extract methane from gas hydrates. To improve the kinetics of the process of replacement of methane with carbon dioxide in gas hydrates, it is proposed do recirculation part of CO2. The scheme and cycle of gas-hydrate energy-technological installation GHET are given, which operates using OTEC and generates together with electricity for GPC, fresh water and cold. Based on the method proposed in this paper, a comparative thermodynamic analysis of installations using OTEC for Black Sea conditions was performed. by GHET and Anderson cycles and it is shown that the specific useful work obtained in the GHET cycle, approximately 3 times more, and energetic efficiency 1.5 times more.
Highlights
Subaquatic deposits of gas hydrates are a significant potential resource for methane production [1,2,3].Among the most prepared for the practical implementation of methods of extracting methane from subaquatic gas hydrates can be divided into three main: 1) injection of warm water under pressure into the well; 2) depressive, according to which lower the pressure in the plast; 3) introduction into the gas hydrate layer of carbon dioxide to replace methane gas [4,5,6]
This paper considers the circuit-technological solution, according to which to increase the energy efficiency of methane production from subaquatic gas hydrates, it is proposed to supply energy to the gas production complex (GPC) in the installation using Ocean Thermal Energy Conversion (OTEC) technology on the gas hydrate cycle (GHET)
The analysis showed that for the energy supply of the gas production complex, which operates on the above technology, you need to spend about 10-15% of the extracted methane
Summary
Subaquatic deposits of gas hydrates are a significant potential resource for methane production [1,2,3]. If such a complex will be built in the conditions of possible use of OTEC, for example in the water near Black Sea [18] or in the Australia [26], it is advisable to generate electricity for energy production in a separate plant using OTEC gas hydrate cycle technology (GHET), in which working fluid is methane, which is extracted Such a plant can be placed on the same platform 4 with a plant for extracting methane from subaquatic deposits of gas hydrates. Ec.w is an exergy of 1 kg of deep cold sea water: ec a c « Tc Tw
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