DESIGN AND OPERATION SIMULATION OF A 760MW NATURAL GAS MIXED SERIES POWER PLANT VIA OPTIMAL EXHAUST GAS, HEAT EXCHANGER

Gas Engineering

It is the primary goal of this study to determine the optimal exhaust gas recirculation ratio in a 760 MW-NGCC power plant with 100% extra air in order to achieve an exhaust gas composition suited for successful amine solution absorption. Recirculated exhaust gas is mixed with secondary air (dilution air) used to cool the turbine in order to achieve this purpose. Using the slope change in the relationship between the molar percentage of oxygen in the exhaust gas and the exhaust gas recirculation ratio, the optimal value of a 0.42 FGR ratio is determined. Recirculation of exhaust gas from the NGCC power plant raises the carbon dioxide concentration in the exhaust gas from 5% to 9.2%, and reduces the oxygen concentration in the exhaust gas from 10.9 to 3.5 percent. The influence of exhaust Gas recirculation on various energy inputs and outputs, as well as the overall efficiency of the power plant, is also explored, since energy efficiency is a critical characteristic of energy conversion systems. Exhaust gas recirculation (EGR) has a greater impact on the generation of electricity from the steam turbine generator (STG) than on the cooling of the combustion turbine generator (CTG) (CTG). It has no impact on the water pump of the steam cycle, and the increase in energy used by the exhaust Gas compressor is compensated for by the reduction in energy consumed by the fresh air compressor. The recirculation of exhaust gas boosts the power plant's total efficiency by 1.1%, from 57.5% to 58.2%, based on the natural gas's low heating value (LHV).

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