بررسي آزمايشگاهي اثر هم افزايي روش هاي جايگزيني دي اكسيد كربن و تحريك گرمايي در توليد متان از مخازن طبيعي هيدرات گازي در حضور نانوذرات

چكيده انگليسي :

73 Experimental investigation of the synergetic effect of CO2 injection and thermal stimulation methods in the methane production from natural gas hydrate reservoirs in the presence of nanoparticles Noushin Adibi n adibi@ce iut ac ir Date of Submission 2019 06 30 Department of Chemical Engineering Isfahan University of Technology Isfahan 84156 83111 Iran Degree M Sc Language FarsiSupervisors Mohammadreza Ehsani ehsanimr@cc iut ac ir Mohsen Mohammadi mohsen mohammadi@cc iut ac irAbstract In upcoming years global energy consumption will increase by 56 and since natural gas is one of thecleanest fossil fuels and is considered as the most important option for energy supply compared to oil andcoal methane hydrate decomposition and extraction of resulting gas will have a clear contribution to thefuture supply of energy resources On the other hand due to high energy consumption in particularly fossilfuels the production of carbon dioxide will also increase in the future So capturing and storing carbondioxide gas will have important effect on environmental protection Therefore the production of methanefrom natural hydrate gas reservoirs significantly available under Oman Sea in Iran And replacing it withcarbon dioxide hydrate will effectively contribute to future fuel supplies and reduce carbon dioxideemissions On the other side using exchange techniques for methane production leads to great reduction inthe formation of water from gas hydrate reservoirs and maintaining the integrity of the sea surface becausethe water released during decomposition is used to form carbon dioxide hydrate which can replace methanehydrates in sediments to maintain stability In this research two methods methane gas replacement withcarbon dioxide and thermal stimulation have been integrated to increase the methane production efficiencyfrom gaseous hydrates Experiments are carried out at constant pressure of methane injection 60 bar and attwo pressures of carbon dioxide injection 40 and 45 bar at three temperatures 5 5 8 and 10 C Thepurpose of this study is to find the optimal temperature and pressure for replacing methane gas in gashydrates with carbon dioxide gas Meanwhile the possible use of silica and zinc oxide nanoparticles toimprove heat and mass transfer and to improve the replacement of carbon dioxide with methane gas has beeninvestigated The analysis of gas samples in these experiments is performed by gas chromatography Usingthe results of gas phase analysis at equilibrium with hydrate temperature and pressure recorded during thetest as well as using mass balance and thermodynamic equations the amount of carbon dioxide and methanein the hydrate phase is calculated in specific time intervals Finally results of the experiments are comparedto each other and the effect of each parameter including temperature pressure and presence of nanoparticles is analyzed Results show that at a constant pressure of 45 bar increasing the temperature from 5 5 to 8 C improves the process of methane replacement with carbon dioxide in methane hydrate plus increasesmethane recovery from 0 to 19 84 But an increase in temperature up to 10 C is not effective as thepercentage of methane recovery was 11 51 and the carbon dioxide storing content was about 80 7 inhibiting carbon dioxide hydrate formation Also the use of zinc oxide nanoparticles can greatly improvethe replacement process and increase methane recovery to 51 87 and carbon dioxide storage to 68 42 Atlast it could be concluded that at a temperature of 8 C and a pressure of 45 bar in the presence of oxidenanoparticles reaching to optimum conditions for this research is possible Keywords gas hydrate natural reservoirs methane replacement with carbon dioxide thermal stimulation zinc oxide nanoparticles

اديبي، نوشين

بررسي آزمايشگاهي اثر هم افزايي روش هاي جايگزيني دي اكسيد كربن و تحريك گرمايي در توليد متان از مخازن طبيعي هيدرات گازي در حضور نانوذرات

مخزن طبيعي هيدرات گازي , جايگزيني متان با دي اكسيد كربن , روش تحريك گرمايي , نانوذره اكسيد روي