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Ogunlade, Stephen Kehinde and Covenant University, Theses (2022) GAS-TO-WIRE FOR UTILIZATION OF STRANDED ASSOCIATED GASES IN NIGER DELTA. Masters thesis, Covenant University Ota.

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Gas-to-wire system has been a promising technology to convert stranded gas to electricity in remote oilfield locations where there is no infrastructure to monetize the gas. The research work was carried out to design an optimized process system which includes process simulations, equipment sizing and cost estimations. The basis for the work is a 5.1 MMscfd (million standard cubic feet per day) of associated gas from an active gas flaring site in Niger Delta Nigeria. The inlet gas has a temperature of 35oC, pressure of 66.5 barg, water content of 63.13 lb/MMSCF, water dew point of 40 oC and 3.97% molar concentration of CO2. The gas-to-wire process route selected comprises acid gas removal, gas dehydration and a combined cycle system. ASPEN HYSYS V10 was used to produce a base case process simulation and sensitivity analyses to arrive at optimal process operating conditions which include for the acid gas removal unit: 8.70 m3/hr of 28% weight strength of Diethanolamine (DEA) in aqueous solution, lean loading of 0.00757 (mol/mol), rich loading of 0.4310 (mol/mol), reboiler duty of 1.002 (lb Steam/Gallon Rich Amine) and 20number of absorber trays with 33% efficiency to obtain a treating gas specification of 15ppm of CO2. For gas dehydration, 0.90 kg/hr recirculation rate of Triethylene glycol (99.8 % by mass) with 0.033 MMscfd of stripping gas injected into the reboiler was the optimal condition to dehydrate the wet from the amine gas treating unit gas to 0.7 lb/MMSCF water content and dew point of -7 oC using 4 absorber trays with 25% efficiency when the lean amine temperature is 40 oC. The combined cycle efficiency simulated has a net power of 27.5 MW and total thermal efficiency of 42%. The research work contributed process design data that can be used to make technical and investment decisions.

Item Type: Thesis (Masters)
Uncontrolled Keywords: Gas-to-wire, Process Simulation, Equipment Sizing, Costings.
Subjects: T Technology > TP Chemical technology
Divisions: Faculty of Engineering, Science and Mathematics > School of Engineering Sciences
Depositing User: nwokealisi
Date Deposited: 20 Sep 2022 15:13
Last Modified: 20 Sep 2022 15:13

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