Fossil fuels are still widely used for power generation. Nevertheless, it is possible to attain a short-and medium-term substantial reduction of greenhouse gas emissions to the atmosphere through a sequestration of the CO 2 produced in fuels' oxidation. The chemical-looping combustion (CLC) technique is based on a chemical intermediate agent, which gets oxidized in an air reactor and is then conducted to a separated fuel reactor, where it oxidizes the fuel in turn. Thus, the oxidation products CO 2 and H 2 O are obtained in an output flow in which the only non-condensable gas is CO 2 , allowing the subsequent sequestration of CO 2 without an energy penalty. Furthermore, with shrewd configurations, a lower exergy destruction in the combustion chemical transformation can be achieved. This paper focus on a second law analysis of a CLC combined cycle power plant with CO 2 sequestration using syngas from coal and biomass gasification as fuel. The key thermodynamic parameters are optimized via the exergy method. The proposed power plant configuration is compared with a similar gas turbine system with a conventional combustion, finding a notable increase of the power plant efficiency. Furthermore, the influence of syngas composition on the results is investigated by considering different H 2 -content fuels.
Chemical-looping hydrogen generation (CLHG) is a chemical-looping combustion variant that allows simultaneous production of power and hydrogen. A thermodynamic analysis from the exergy method point of view of an integrated syngas-fueled CLHG cycle is carried out with the aim of contributing to the conceptual understanding and development of CLHG systems. The cycle working point is optimized in a range of conditions. The proposed system shows a very interesting potential for power, hydrogen and process heating coproduction with high efficiency.
Fossil fuels are still needed extensively for power generation. Nevertheless, it would be feasible to attain a considerable reduction of greenhouse gas emissions to the atmosphere derived from this activity capturing the CO 2 produced by fossil fuels oxidation. The chemical-looping combustion (CLC) technique is based on a chemical intermediate agent which gets oxidized in an air reactor and is then conducted to a separated fuel reactor where it oxidizes the fuel in turn. Thus, the oxidation products CO 2 and H 2 O are obtained in an output flow in which the only non-condensable gas is CO 2 , allowing the subsequent sequestration of CO 2 without energy penalty. Furthermore, with shrewd configurations a lower exergy destruction in the combustion chemical transformation can be achieved. This paper focus on a Second-Law analysis of a CLC combined cycle power plant with CO 2 sequestration using syngas from coal and biomass gasification as fuel. The key thermodynamic parameters are optimized via the exergy method. The proposed power plant configuration is compared with an equivalent gas turbine system based on a conventional combustion, finding a notable increase of the power plant efficiency. Also, the sensitivity of the results to syngas composition is investigated by considering different H 2-content fuels.
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