Reduction Behavior of Iron Oxide for Chemical-Looping Hydrogen Generation in a Compact Fluidized Fuel Reactor

2014 ◽  
Author(s):  
Shiyi Chen ◽  
Zhipeng Xue ◽  
Xiang Wang ◽  
Changchun Xu ◽  
Dong Wang ◽  
...  
Keyword(s):  
Iron Oxide ◽  
Fluidized Bed ◽  
Iron Ore ◽  
Hydrogen Generation ◽  
Oxygen Carrier ◽  
Chemical Looping ◽  
High Concentration ◽  
Bed Temperature ◽  
Fuel Reactor ◽  
Chemical Looping Hydrogen Generation

Chemical-looping hydrogen generation (CLHG) integrates chemical-looping combustion (CLC) and the steam-iron process. It is a process for hydrogen production with inherent CO2 separation. CLHG includes three reactors: a fuel reactor, a steam reactor and an air reactor, with iron oxide as oxygen carrier. This paper presents a compact fluidized fuel reactor for CLHG to produce reductive FeO with CO2 sequestration. An iron ore as oxygen carrier was tested, and CO and syngas were used as fuels. The results showed that through this compact fuel reactor, reductive FeO for further hydrogen generation was obtained and a high concentration CO2 was separated at the outlet of the fuel reactor. The influence of riser temperature, bubble fluidized bed temperature and Fe2O3/CO ratio on the bed performance was investigated. It revealed that the bubble fluidized bed temperature and Fe2O3/CO ratio had a significant impact on the fuel conversion while the effect of riser temperature was marginal. The iron ore exhibited good reactivity and no agglomeration was found in the experiment.

Chemical Looping Hydrogen Generation Using Potassium-Modified Iron Ore as an Oxygen Carrier

2016 ◽  
Vol 30 (3) ◽  
pp. 1756-1763 ◽  
Author(s):  
Weidong Liu ◽  
Laihong Shen ◽  
Haiming Gu ◽  
Lifeng Wu
Keyword(s):  
Iron Ore ◽  
Hydrogen Generation ◽  
Oxygen Carrier ◽  
Chemical Looping ◽  
Chemical Looping Hydrogen Generation

scholarly journals Modelling of three-reactor system for chemical looping hydrogen generation: identifying a suitable operating range

2019 ◽  
Vol 118 ◽  
pp. 02035
Author(s):  
Zhipeng Xue ◽  
Junfeng Xu ◽  
Minmin Zhao
Keyword(s):  
Fluidized Bed ◽  
Hydrogen Generation ◽  
Oxygen Carrier ◽  
Reactor System ◽  
Chemical Looping ◽  
Fuel Gas ◽  
Operating Range ◽  
System Temperature ◽  
Chemical Looping Hydrogen Generation ◽  
Operational Range

Chemical-looping hydrogen generation can produce hydrogen from fossils fuels with inherent separation of CO2. In this article, a novel compact fluidized bed is used for CLHG to solve the problem of low fuel gas conversion causing by thermodynamic limit. Based on the compact fluidized bed, a modelling of three-reactor system for CLHG process is built to study the operating range of this system. The results show that the low limit of the system temperature is 650°C, or else unexpected reaction will occur in reactors. The system can achieve heat-integrated by mixing a certain amount of inert support into oxygen carrier and adjusting a suitable temperature different among reactors. Moreover, an operational range of the oxygen carrier recycle rate between 6 and 8 mol Fe/mol CH4 is recommended for more extensive operating region and relative higher CH4/H2 ratio can be obtain. Finally, a fitting formula described the operating range of this system is proposed to provide a reference for the experiment and simulation in further work.

scholarly journals Modeling of the Chemical Looping Combustion of Hard Coal and Biomass Using Ilmenite as the Oxygen Carrier

Energies ◽  
2020 ◽  
Vol 13 (20) ◽  
pp. 5394
Author(s):  
Anna Zylka ◽  
Jaroslaw Krzywanski ◽  
Tomasz Czakiert ◽  
Kamil Idziak ◽  
Marcin Sosnowski ◽  
...  
Keyword(s):  
Fluidized Bed ◽  
Oxygen Carrier ◽  
Experimental Tests ◽  
Chemical Looping Combustion ◽  
Hard Coal ◽  
Chemical Looping ◽  
Simulation Accuracy ◽  
Energy Technologies ◽  
Fuel Reactor ◽  
Relative Errors

This paper presents a 1.5D model of a fluidized bed chemical looping combustion (CLC) built with the use of a comprehensive simulator of fluidized and moving bed equipment (CeSFaMB) simulator. The model is capable of calculating the effect of gas velocity in the fuel reactor on the hydrodynamics of the fluidized bed and the kinetics of the CLC process. Mass of solids in re actors, solid circulating rates, particle residence time, and the number of particle cycles in the air and fuel reactor are considered within the study. Moreover, the presented model calculates essential emissions such as CO2, SOX, NOX, and O2. The model was successfully validated on experimental tests that were carried out on the Fluidized-Bed Chemical-Looping-Combustion of Solid-Fuels unit located at the Institute of Advanced Energy Technologies, Czestochowa University of Technology, Poland. The model’s validation showed that the maximum relative errors between simulations and experiment results do not exceed 10%. The CeSFaMB model is an optimum compromise among simulation accuracy, computational resources, and processing time.

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