Abstract
The main objective of this paper is to study the effects of Flue Gas Recirculation (FGR) ratio and Excess Air (EA) in a natural gas-fired turbine for an effective CO2 absorption by amines. To achieve this goal, the flue gas should contain at least 10% (mol.) of CO2. Moreover, in order to avoid technical problems related to the oxidative degradation of amines, the flue gas should also contain less than 5% (mol.) of O2. The simulation results indicate that, for a gas turbine that limits the temperature of the exhaust gas leaving the combustor at 1100°C, an excess air (EA) of 200% and a Flue Gas Recirculation (FGR) ratio of 0.65 are needed to fit the requirements of an effective absorption process by amines. For a turbine that allows temperatures as high as 1500°C, the operating parameters (EA=100% and FGR ratio of 0.4) will be selected.
Highlights
One of the largest EOR (Enhanced Oil Recovery) projects worldwide using anthropogenic CO2 is the Weyburn project in Canada
Using a natural gas-fired power plant of 700 MW, the results presented by Bolland and Saether [8] show that, using a recirculation ratio of 0.4, the molar percentage of CO2 increased from 3.3 % to 5.5 % and the molar percentage of O2 decreased from 13.8% to 9.8%
Effects of flue gas recirculation and excess air on the temperature of exhaust gas In a gas turbine, the blades have a metallurgical limitation and the temperatures could vary from 800°C to 1700°C depending on their materials and whether or not they have cooling systems [15]
Summary
One of the largest EOR (Enhanced Oil Recovery) projects worldwide using anthropogenic CO2 is the Weyburn project in Canada. The project is expected to produce 122 million bbls of incremental oil, extending the field life by 20-25 years and increasing the oil recovery to 34% of OOIP (Original Oil In Place) [1,2]. In order to provide large volumes of CO2 to serve EOR projects in the oil fields of the UAE, carbon dioxide need to be captured from industrial facilities such as power and desalination plants, oil refineries, gas processing facilities and/or petrochemical complexes [3]. The valuable fuel gas used for EOR techniques in the UAE could be utilized to produce electricity in power generation plants. The use of CO2-EOR technique will enhance the production of crude oil in the UAE
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