Abstract
Emission of carbon dioxide from fossil fuel-fired thermal power plants is a major concern for energy providers all around the world. In this context, carbon capture from thermal power plants and the energy penalty incurred in the process are important issues. The present work reports on a detailed analysis of gas-fired power plant layouts with in-built carbon capture, i.e. the flue gas from these power plants contains mainly carbon dioxide and water vapour. Four layouts, two of which are based on pressurized oxyfuel combustion and two on chemical looping combustion (CLC), have been considered. Based on detailed mass balance, energy and thermodynamic analyses of the power plant layouts, the net efficiencies for each plant have been computed. After accounting for thermodynamic irreversibilities and CO2 compression to 110 bar, these have been found to vary between 31 and 52 % for the four plants. Despite the technological maturity of oxyfuel combustion, it is concluded that CLC-based plants would be future-ready in the sense that they can readily accommodate CCS with only 2 % loss in overall thermal efficiency for CO2 capture.
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Abbreviations
- ASU:
-
Air separation unit
- CLC:
-
Chemical looping combustion
- CC:
-
Combined cycle
- SMOC:
-
Steam-moderated oxyfuel combustion
- CLCSC:
-
Chemical looping combustion steam cycle
- HRSG:
-
Heat recovery steam generator
- LP:
-
Low pressure
- MP:
-
Medium pressure
- HP:
-
High pressure
- AR:
-
Air reactor
- FR:
-
Fuel reactor
- \(M_{\text{Air in}}\) :
-
Mass of air entering air reactor per unit time, kg/s
- \(M_{\text{Dep air}}\) :
-
Mass of depleted air leaving air reactor per unit time, kg/s
- \(M_{{{\text{MeO}}_{x} }}\) :
-
Mass of oxygenated metal oxide per unit time, kg/s
- \(M_{{{\text{MeO}}_{x - 1} }}\) :
-
Mass of reduced metal/metal oxide per unit time, kg/s
- \(M_{\text{Fuel in}}\) :
-
Mass of fuel entering fuel reactor per unit time, kg/s
- M Exhaust :
-
Mass of exhaust leaving fuel reactor per unit time, kg/s
- T :
-
Temperature at any point, °C
- \(Q_{\text{Air in}}\) :
-
Thermal energy flow in air entering the air reactor, kW
- \(Q_{\text{Depleted air}}\) :
-
Thermal energy flow in oxygen-depleted air, kW
- Q MeOx :
-
Thermal energy flow in oxygenated metal oxide, kW
- Q Me :
-
Thermal energy flow in reduced form of metal oxide, kW
- Q Ox :
-
Thermal energy produced by metal oxidation reaction, kW
- \(Q_{\text{Extract}}\) :
-
Thermal energy extracted from air reactor by cooling fluid, kW
- \(Q_{\text{Fuel in}}\) :
-
Thermal energy flow in fuel entering the air reactor, kW
- Q Red :
-
Heat produced by metal reduction reaction, kW
- MeO:
-
Oxygenated metal oxide
- Me:
-
Reduced form of metal oxide
- e :
-
Electrical (related to power, as in MWe)
- Ox:
-
Oxidation
- Red:
-
Reduction
- x, x − 1:
-
Oxidized and reduced states of O2 carrier, respectively
- th:
-
Thermal (related to power, as in MWth)
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Basavaraja, R.J., Jayanti, S. Comparative analysis of four gas-fired, carbon capture-enabled power plant layouts. Clean Techn Environ Policy 17, 2143–2156 (2015). https://doi.org/10.1007/s10098-015-0936-7
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DOI: https://doi.org/10.1007/s10098-015-0936-7