Abstract
The objective of this investigation is to analyze the impact of the flue gas recirculation (FGR) ratio on the different energy inputs and outputs of a SNGCC power plant as well as its overall efficiency. Simulation results indicate that increasing flue gas recirculation increases the energy consumed by the recirculation compressor and the energy produced by the gas turbine. On the other hand, it decreases the production of energy of the steam turbine and the energy consumed by the pump of the steam cycle. The overall energy efficiency of the SNGCC power plant is highest (41.09%) at a value of 0.20 of the flue gas recirculation. However, the flue gas composition with a FGR ratio of 0.37 is more suitable for effective absorption of carbon dioxide by amine solutions. Based on the low heating value (LHV) of hydrogen, the corresponding overall efficiency of the power plant is 39.18% and the net power output of the plant is 1273 kW for consumption of 97.5 kg/hr. of hydrogen.
Highlights
According to the U.S Energy Information Administration, the burning of fossil fuels was responsible for 76 percent of U.S greenhouse gas emissions in 2016 [1]
The objective of this investigation is to analyze the impact of the flue gas recirculation (FGR) ratio on the different energy inputs and outputs of a Synthetic Natural Gas Combined Cycle (SNGCC) power plant as well as its overall efficiency
Simulation results indicate that increasing flue gas recirculation increases the energy consumed by the recirculation compressor and the energy produced by the gas turbine
Summary
According to the U.S Energy Information Administration, the burning of fossil fuels was responsible for 76 percent of U.S greenhouse gas emissions in 2016 [1]. As natural gas (NG) is the cleanest fossil fuel for electricity production, gas-fired power generation plants are expected to play a significant role in order to reduce carbon dioxide emissions from the power generation sector. E. Dadach related to the lowest carbon dioxide emissions, natural gas (NG) is the recommended combustible because it reduces the operating cost of the plants by avoiding corrosion and other technical problems in the facilities caused by impurities such as H2S, SOx, NOx and HCl. the corresponding molar percentage of CO2 in flue gas is only about 3% - 3.5% [3]. The cost of CO2 capture from natural gas-fired power generation plants is high because of the large amount of energy needed in the stripper to obtain leaner amine. The recirculated flue gas is often utilized as the secondary air (dilution air) to cool down the blades of the gas turbine
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