Review of agglomeration in biomass chemical looping technology

Published on Feb 1, 2022in Fuel6.609
· DOI :10.1016/J.FUEL.2021.122199
Zhenwu Miao3
Estimated H-index: 3
(SCAU: South China Agricultural University),
Enchen Jiang10
Estimated H-index: 10
(SCAU: South China Agricultural University),
Zhifeng Hu6
Estimated H-index: 6
(SCAU: South China Agricultural University)
Source
Abstract
Abstract null null This review discusses the influence of three key factors on agglomeration of chemical looping technology from the aspects of reaction conditions, the oxygen carrier and biomass composition. In addition, the existing agglomeration mechanisms are extended, and the technologies of detection and prevention of the agglomeration is reviewed. In the process of chemical looping reaction, high reaction temperature, the oxygen carrier materials with poor anti-sintering ability and the reaction system containing more alkali metals and silicon-based materials will easily cause agglomeration. Previous literatures have summarized the agglomeration produced by two mechanisms, and both of them pointed out that the alkali metal in the biomass ash is the main component to induce the agglomeration. For the SiO2-based oxygen carrier material, it is speculated that the alkali metal will react with the support to inactivate the active metal component through the inclusion of the molten material. However, the oxygen carrier without SiO2-based material is mainly produced through the mechanism of melt-induced, but not the coating-induced agglomeration. The predication of agglomeration focuses on the biomass ash test before the reaction and the monitoring of some variables during the reaction process, such as temperature and pressure analysis. Moreover, the agglomeration can be prevented or controlled by condition adjustment, reactor design, oxygen carrier design and biomass pretreatment. In addition, the use of additives is also a reliable method to reduce the agglomeration.
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Abstract null null Chemical looping (CL) technology using an oxygen carrier (OC) offers a versatile platform to convert various fuels (e.g., CH4, coal, and biomass) to value-added products (e.g., heat, syngas, and H2) in a clean and efficient approach. Currently, the migration and transformation mechanisms of lattice oxygen in spinel OCs were not extensively investigated, which are considered the cornerstone of OC. In this work, the release-uptake paths of lattice oxygen and the chemical reactio...
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view all 9 authors...
Abstract null null Mercury pollution has received much attention due to its severe harm to human and ecological system. The major source of mercury emission is from coal combustion. In the flue gas, elemental mercury (Hg0) is the most abundant and difficult form to be removed. In the chemical-looping combustion of coal (CLCC), oxygen carrier (OC) plays the role of oxygen storage and release, and it also has catalytic ability for Hg0 removal. In this study, a magnetic material Co3O4@TiO2@Fe2O3 (C...
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view all 5 authors...
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Abstract The surface structure has a great influence on the chemistry property and performance of oxygen carrier used for chemical-looping combustion. Based on density functional theory and periodic structure model, the effect of oxygen vacancy and sulfur poisoning on the reaction of copper ferrite spinel with CO during chemical-looping combustion was systematically studied. The results show that Cu–O2 bridging site shows better activity towards CO adsorption on the O-defective and sulfur-poison...
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Abstract Chemical looping combustion (CLC) of biomass is a promising technology for power generation with integrated carbon capture. In CLC, alkali content of biomass poses potential issues of bed agglomeration, as well as heat exchanger fouling and corrosion. The fate of biomass alkalis was investigated in a dual-interconnected circulating fluidized bed CLC system. Experiments were conducted in oxygen carrier aided combustion (OCAC) and CLC modes. Ilmenite and braunite oxygen carriers and three...
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Abstract A key issue for commercial application of chemical looping combustion (CLC) technology is the selection of oxygen carriers (OCs) with good fluidization and high reactivity during the long-term redox operation. Conventional fluidized bed reactors and thermogravimetric analyzer (TGA) are fail to simultaneously satisfy the fluidization and real-time mass measurement of bed materials. A fluidized bed thermogravimetric analyzer (FB-TGA) combining the advantages of fluidized bed and TGA is be...
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Abstract Reduction kinetics of unpromoted and Na2WO4-promoted CaMn0.9Fe0.1O3 redox catalysts are measured in the context of chemical looping-oxidative dehydrogenation (CL-ODH). CL-ODH is a promising alternative for ethylene production compared to steam cracking, as it reduces the energy demand and increases the single-pass ethane conversion. The ability of a redox catalyst for selective hydrogen combustion (SHC), i.e. selectively oxidizing hydrogen co-product from ethane dehydrogenation, represe...
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Abstract Ash residues produced from biomass gasification could agglomerate and cause severe ash-related problems. The objectives of this study were to determine the impacts of different operating parameters (including equivalent ratio (ER), residence time (RT), and gasification temperature (GT)) on ash deposits during corncob gasification and to further elucidate ash agglomeration mechanisms. The results indicated that the major difference between the ashes in gasifier and the cyclone fly ash (C...
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Abstract Preparing the oxygen storage material capable of being highly reduced with desirable stability is important to reduce the solid circling rate in a fluidized bed chemical looping reactor. Nevertheless, the high oxygen carrier reduction degree would accelerate sintering. In this work a Mn0.5Fe0.5(FeAl)Ox material is synthesized as the oxygen carrier of chemical looping hydrogen production process. It exhibits a good redox stability during 30 cycles even operated at reduction degree of 0.8...
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