title: Thermodynamic analysis of in situ gasification-chemical looping combustion (iG-CLC) of Indian coal.
abstract: Chemical looping combustion (CLC) is an inherent CO2capture technology. It is gaining much interest in recent years mainly because of its potential in addressing climate change problems associated with CO2emissions from power plants. A typical chemical looping combustion unit consists of two reactors-fuel reactor, where oxidation of fuel occurs with the help of oxygen available in the form of metal oxides and, air reactor, where the reduced metal oxides are regenerated by the inflow of air. These oxides are then sent back to the fuel reactor and the cycle continues. The product gas from the fuel reactor contains a concentrated stream of CO2which can be readily stored in various forms or used for any other applications. This unique feature of inherent CO2capture makes the technology more promising to combat the global climate changes. Various types of CLC units have been discussed in literature depending on the type of fuel burnt. For solid fuel combustion three main varieties of CLC units exist namely: syngas CLC, in situ gasification-CLC (iG-CLC) and chemical looping with oxygen uncoupling (CLOU). In this paper, theoretical studies on the iG-CLC unit burning Indian coal are presented. Gibbs free energy minimization technique is employed to determine the composition of flue gas and oxygen carrier of an iG-CLC unit using Fe2O3, CuO, and mixed carrier-Fe2O3and CuO as oxygen carriers. The effect of temperature, suitability of oxygen carriers, and oxygen carrier circulation rate on the performance of a CLC unit for Indian coal are studied and presented. These results are analyzed in order to foresee the operating conditions at which economic and smooth operation of the unit is expected.
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Warangal, Warangal, 506004, India. pvsuresh@nitw.ac.in.
authors.forename: P V
authors.initials: PV
authors.lastname: Suresh
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Warangal, Warangal, 506004, India.
authors.forename: Kavitha G
authors.initials: KG
authors.lastname: Menon
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Warangal, Warangal, 506004, India.
authors.forename: K S
authors.initials: KS
authors.lastname: Prakash
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Warangal, Warangal, 506004, India.
authors.forename: S
authors.initials: S
authors.lastname: Prudhvi
authors.affiliation: Department of Chemical Engineering, National Institute of Technology Warangal, Warangal, 506004, India.
authors.forename: A
authors.initials: A
authors.lastname: Anudeep
mesh_terms: D000397:Air Pollution / Q000517:prevention & control*; D002245:Carbon Dioxide / Q000302:isolation & purification*; D057231:Climate Change; D003031:Coal / Q000032:analysis*; D005290:Ferric Compounds / Q000737:chemistry; D008962:Models, Theoretical; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry; D010100:Oxygen / Q000737:chemistry; D011210:Power Plants / Q000592:standards; D013696:Temperature; D013816:Thermodynamics
chemical_list: D003031:Coal; D005290:Ferric Compounds; D010087:Oxides; D002245:Carbon Dioxide; D010100:Oxygen
keywords: CO2 capture; Chemical looping combustion; Gibbs free energy minimization; In situ gasification; Indian coal; Oxygen carrier