International Journal of Energy Research · 2005 · 71 citations · 14 references
EngineeringChemical EngineeringMechanical EngineeringCombustionEnergy SystemsHeat TransferCombustion FundamentalsCombustion ProcessesCombustion ThermodynamicsEnergy ConversionGas Turbine CombustionHeat Transfer In ReactorsChemical Looping CombustionCombustion In Fluidized Bed ReactorsElectrical Power SystemsGas Turbine CycleGas Turbine OperationProcess ParametersThermal EfficiencyThermodynamic Cycles In Combustion
Classical chemical looping combustion uses a solid oxygen carrier cycling between two fluidized beds to transport oxygen from air to fuel, thereby avoiding fuel–air mixing and achieving inherent CO₂ separation. The extended chemical looping combustion (exCLC) cycle couples an oxygen carrier with a carbon carrier across three fluidized‑bed reactors—oxidation, hydrogen production/separation, and carbon regeneration—to generate hydrogen, heat, and electricity. The exCLC cycle integrated with a steam‑injected gas turbine can achieve a thermal efficiency of 54 % while capturing 96 % of CO₂, which is compressed to 110 bar, and it inherently separates CO₂ and hydrogen during combustion. © 2005 John Wiley & Sons, Ltd.
In this article, a novel cycle configuration has been studied, termed the extended chemical looping combustion integrated in a steam-injected gas turbine cycle. The products of this system are hydrogen, heat, and electrical power. Furthermore, the system inherently separates the CO2 and hydrogen that is produced during the combustion. The core process is an extended chemical looping combustion (exCLC) process which is based on classical chemical looping combustion (CLC). In classical CLC, a solid oxygen carrier circulates between two fluidized bed reactors and transports oxygen from the combustion air to the fuel; thus, the fuel is not mixed with air and an inherent CO2 separation occurs. In exCLC the oxygen carrier circulates along with a carbon carrier between three fluidized bed reactors, one to oxidize the oxygen carrier, one to produces and separate the hydrogen, and one to regenerate the carbon carrier. The impacts of process parameters, such as flowrates and temperatures have been studied on the efficiencies of producing electrical power, hydrogen, and district heating and on the degree of capturing CO2. The result shows that this process has the potential to achieve a thermal efficiency of 54% while 96% of the CO2 is captured and compressed to 110 bar. Copyright © 2005 John Wiley & Sons, Ltd.
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