Reactivity of a CaSO4-oxygen carrier in chemical-looping combustion of methane in a fixed bed reactor

摘要: Chemical-looping combustion (CLC) is a promising technology for the of gas or solid fuel with efficient use energy and inherent separation CO2. A reactivity study CaSO4 oxygen carrier in CLC methane was conducted laboratory scale fixed bed reactor. The particles were exposed six cycles alternating reduction oxidation air. majority CH4 reacted to form CO2 H2O. incomplete, possibly due product layer. increased initial but slightly decreased after four cycles. yields CO2, CH4, CO analyzed. Carbon deposition during period confirmed combustible (CO+H2) slight formed early stage oxidation. mechanism carbon effect also discussed. SO2 release behavior investigated, possible formation mitigation method conversion gradually cyclic test while it could not restore its capacity mass-based reaction rates demonstrated variation carrier. XRD analysis illustrated phase change CaS main product, amount CaO test. ESEM surface tested reactor uniform porosity. EDS transfer from leaving as dominant reduced product. results show that may be an interesting candidate CLC.