Performance in a Fixed-Bed Reactor of Titania-Supported Nickel Oxide as Oxygen Carriers for the Chemical-Looping Combustion of Methane in Multicycle Tests

Fe2O3/Al2O3/ZnO oxygen carriers with small content ZnO (5 wt% to 10 wt%) were prepared by physical mixing method and were evaluated its capability as an oxygen carrier in a chemical looping combustion. The combustion was conducted by using CH4 as a fuel gas. The reduction process of Fe2O3/Al2O3/ZnO oxygen carrier was carried out in a fixed bed reactor. The solid reduction products were characterized by X-ray diffraction (XRD) and Scanning Electron Microscope with EDS Attachment (SEM-EDS). The results show that the reactivity of Fe2O3/Al2O3/ZnO oxygen carriers is greater than that of Fe2O3/Al2O3 which is implied the synergetic effect between ZnO and Fe2O3. XRD results show that the iron oxide in the oxygen carriers is reduced to metallic iron. SEM-EDS also shows that the iron agglomeration is prevented. Consequently, the suitable content of ZnO in oxygen carriers is ranged from 5 wt% to 10 wt%.

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Reduction Kinetics of Fe-based Oxygen Carriers Using Syngas in a Honeycomb Fixed-Bed Reactor for Chemical-Looping Combustion

Journal of Thermal Science ◽

10.1007/s11630-020-1255-9 ◽

2019 ◽

Vol 29 (1) ◽

pp. 13-24 ◽

Cited By ~ 3

Author(s):

Xiangyu Liu ◽

Hao Zhang ◽

Hui Hong

Keyword(s):

Fixed Bed ◽

Fixed Bed Reactor ◽

Chemical Looping Combustion ◽

Reduction Kinetics ◽

Chemical Looping ◽

Oxygen Carriers ◽

Kinetics Of

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Investigation of a Novel Gas Turbine Cycle With Coal Gas Fueled Chemical-Looping Combustion

10.1115/imece2000-1351 ◽

2000 ◽

Author(s):

Hongguang Jin ◽

Masaru Ishida

Keyword(s):

Natural Gas ◽

Fixed Bed ◽

Combined Cycle ◽

Fixed Bed Reactor ◽

Chemical Looping Combustion ◽

Chemical Looping ◽

Gas Combustion ◽

Coal Gas ◽

New Type ◽

Oxidation Reactor

Abstract A new type of integrated gasification combined cycle (IGCC) with chemical-looping combustion and saturation for air is proposed and investigated. Chemical-looping combustion may be carried out in two successive reactions between two reactors, a reduction reactor (coal gas with metal oxides) and an oxidation reactor (the reduced metal with oxygen in air). The study on the new system has revealed that the thermal efficiency of this new-generation power plant will be increased by approximately 10–15 percentage points compared to the conventional IGCC with CO2 recovery. Furthermore, to develop the chemical-looping combustor, we have experimentally examined the kinetic behavior between solid looping materials and coal gas in a high-pressure fixed bed reactor. We have identified that the coal gas chemical-looping combustor has much better reactivity, compared to the natural gas one. This finding is completely different from the direct combustion in which combustion with natural gas is much easier than that with other fuels. Hence, this new type of coal gas combustion will make breakthrough in clean coal technology by simultaneously resolving energy and environment problems.

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