Study On Cu-based Oxygen Carriers For Chemical Looping With Oxygen Uncoupling

Chemical-Looping with oxygen uncoupling（CLOU） is a novel method of CheimalLooping Combustion.According to the principle of zero emission,CLOU could not onlyavailably enrith CO₂without the need for an energy intensive air separation,but alsoeffectively increase the combustion effciency,inhibit and eradicate the formation of NOx.Inthis paper bases research on oxygen carriers for realization chemical looping with oxygenuncoupling for combustion of fuel in a fluidized-bed reactor（FzB）.The Gibbs free energy and chemical equilibrium constant calculation of reaction ofCopper-based oxygen carrier desorption and simulate the temperature change in fuelreactor.The simulation result shows that the temperature aggrandizes with the oxygencarriers’ conversion increase. Oxygen carriers added inert carriers can restrain thetemperature increase.Oxygen carriers CuO/CuAl₂O₄are perpared by sol-gel. XRD, FSEM, and BET havebeen used to characterize the physicochemical properties of oxygen carriers.And thenresearch the performance of sorption and desorption of the three oxygen carriers.Theresults show that the three oxygen carriers can release O₂in inert atmosphere and absorb O₂in air atmosphere. At the same time,the recation kinetics cracteristic is calculated withmodel fitting method.The reactivity between Cu-based oxygen carriers and petrolium coke and methane areresearched in FzB.The results show that Cu-based oxygen carriers carriers are appropriateto apply in Chemical looping with oxygen uncoupling for combustion.During thecombustion process, the rate of desorption of oxygen carriers is faster than that ofconsumption of fuel burning.and the oxygen carriers can completely meet the demand of O₂for fuel burning.The rate of fuel reaction increases with the increase of reactiontemperature.The reaction rate of solid fuels is not only influenced by temperature but alsodepends on the nature of the solid fuels themselves.High-volatile fuels are generally morerapidly converted than low volatile fuels. Simultaneously, high volatile content may resultin high CO concentration. After deprivation of volatile，the CO yeild decreases greatly andeven reduces to zero.