Abstract
The transition to oxy-fuel combustion power cycles is a prospective way to decrease carbon dioxide emissions into the atmosphere from the energy sector. To identify which technology has the highest efficiency and the lowest emission level, a thermodynamic analysis of the semiclosed oxy-fuel combustion combined cycle (SCOC-CC), the E-MATIANT cycle, and the Allam cycle was carried out. The modeling methodology has been described in detail, including the approaches to defining the working fluid properties, the mathematical models of the air separation unit, and the cooled gas turbine cycles’ calculation algorithms. The gas turbine inlet parameters were optimized using the developed modeling methodology for the three oxy-fuel combustion power cycles with CO2 recirculation in the inlet temperature at a range of 1000 to 1700 °C. The effect of the coolant flow precooling was evaluated. It was found that a decrease in the coolant temperature could lead to an increase of the net efficiency up to 3.2% for the SCOC-CC cycle and up to 0.8% for the E-MATIANT cycle. The final comparison showed that the Allam cycle’s net efficiency is 5.6% higher compared to the SCOC-CC cycle, and 11.5% higher compared with the E-MATIANT cycle.
Highlights
The International Energy Agency expects a 30% increase in power consumption during2016–2040 [1]
The power production industry produces a remarkable amount of harmful emissions [2], so the mitigation of power facility emissions is a topical direction
The parametric optimization of the semiclosed oxy-fuel combustion combined cycle (SCOC-CC) cycle shows that when the initial fluid temperature increased from 1100 to 1700 ◦ C, the optimal initial pressure, the coolant massflow, and the net efficiency grew from 2 to 7 MPa, from 8.1 to 36%, and from 41.0 to
Summary
The International Energy Agency expects a 30% increase in power consumption during2016–2040 [1]. The International Energy Agency expects a 30% increase in power consumption during. The annular combustion of hydrocarbons will grow, which increases the toxic and greenhouse gases’ atmospheric emissions. Organic fuel combustion produces huge amounts of carbon dioxide, and its emissions still are a difficult problem [8,9]. Known carbon dioxide capturing technology considerably increases the power production expenses [10,11,12]. The creation of environmentally friendly and financially efficient large power facilities is a valid problem. This is emphasized by the introduction of some international agreements, especially the Paris Climate Agreement, which has been signed by nearly 200 countries
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