{"title":"不同 O2/CO2/H2O 大气条件下流化床中毫米级铝颗粒的燃烧特性","authors":"Jialing Zhou , Rui Zhang , Dong Liu","doi":"10.1016/j.partic.2024.04.003","DOIUrl":null,"url":null,"abstract":"<div><p>Aluminum is an attractive alternative fuel, but it burns very inefficiently due to the formation of a dense Al<sub>2</sub>O<sub>3</sub> layer which prevents O<sub>2</sub> from diffusion to the surface of Al particles. In previous experiments, the combustion of millimeter-sized Al (mAl) particles in the fluidized bed has achieved a substantial increase in the combustion efficiency, but further improvements are still needed. In this study, the effects of reaction atmosphere on the fluidized combustion of mAl particles were investigated. The experiments with different O<sub>2</sub>/H<sub>2</sub>O/CO<sub>2</sub> concentrations were conducted. The experimental results indicate that the combustion efficiency of mAl particles in fluidized bed increases as the mole fraction of O<sub>2</sub>, H<sub>2</sub>O or CO<sub>2</sub> increases, and the highest combustion efficiency can reach 38.7%. After the analysis of the oxide film on the surface of aluminum particles, it was found that it is easier to generate the unstable θ-Al<sub>2</sub>O<sub>3</sub> under CO<sub>2</sub> atmosphere, and it is easier to generate the unstable γ-Al<sub>2</sub>O<sub>3</sub> and θ-Al<sub>2</sub>O<sub>3</sub> under H<sub>2</sub>O atmosphere. The unstable Al<sub>2</sub>O<sub>3</sub> film is more likely to be abraded in the fluidized bed, which leads to the effective improvement of the combustion efficiency.</p></div>","PeriodicalId":401,"journal":{"name":"Particuology","volume":null,"pages":null},"PeriodicalIF":4.1000,"publicationDate":"2024-04-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Combustion characteristics of millimeter-sized aluminum particles in fluidized bed under various O2/CO2/H2O atmospheres\",\"authors\":\"Jialing Zhou , Rui Zhang , Dong Liu\",\"doi\":\"10.1016/j.partic.2024.04.003\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<div><p>Aluminum is an attractive alternative fuel, but it burns very inefficiently due to the formation of a dense Al<sub>2</sub>O<sub>3</sub> layer which prevents O<sub>2</sub> from diffusion to the surface of Al particles. In previous experiments, the combustion of millimeter-sized Al (mAl) particles in the fluidized bed has achieved a substantial increase in the combustion efficiency, but further improvements are still needed. In this study, the effects of reaction atmosphere on the fluidized combustion of mAl particles were investigated. The experiments with different O<sub>2</sub>/H<sub>2</sub>O/CO<sub>2</sub> concentrations were conducted. The experimental results indicate that the combustion efficiency of mAl particles in fluidized bed increases as the mole fraction of O<sub>2</sub>, H<sub>2</sub>O or CO<sub>2</sub> increases, and the highest combustion efficiency can reach 38.7%. After the analysis of the oxide film on the surface of aluminum particles, it was found that it is easier to generate the unstable θ-Al<sub>2</sub>O<sub>3</sub> under CO<sub>2</sub> atmosphere, and it is easier to generate the unstable γ-Al<sub>2</sub>O<sub>3</sub> and θ-Al<sub>2</sub>O<sub>3</sub> under H<sub>2</sub>O atmosphere. The unstable Al<sub>2</sub>O<sub>3</sub> film is more likely to be abraded in the fluidized bed, which leads to the effective improvement of the combustion efficiency.</p></div>\",\"PeriodicalId\":401,\"journal\":{\"name\":\"Particuology\",\"volume\":null,\"pages\":null},\"PeriodicalIF\":4.1000,\"publicationDate\":\"2024-04-19\",\"publicationTypes\":\"Journal Article\",\"fieldsOfStudy\":null,\"isOpenAccess\":false,\"openAccessPdf\":\"\",\"citationCount\":\"0\",\"resultStr\":null,\"platform\":\"Semanticscholar\",\"paperid\":null,\"PeriodicalName\":\"Particuology\",\"FirstCategoryId\":\"88\",\"ListUrlMain\":\"https://www.sciencedirect.com/science/article/pii/S1674200124000579\",\"RegionNum\":2,\"RegionCategory\":\"材料科学\",\"ArticlePicture\":[],\"TitleCN\":null,\"AbstractTextCN\":null,\"PMCID\":null,\"EPubDate\":\"\",\"PubModel\":\"\",\"JCR\":\"Q2\",\"JCRName\":\"ENGINEERING, CHEMICAL\",\"Score\":null,\"Total\":0}","platform":"Semanticscholar","paperid":null,"PeriodicalName":"Particuology","FirstCategoryId":"88","ListUrlMain":"https://www.sciencedirect.com/science/article/pii/S1674200124000579","RegionNum":2,"RegionCategory":"材料科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q2","JCRName":"ENGINEERING, CHEMICAL","Score":null,"Total":0}
引用次数: 0
摘要
铝是一种极具吸引力的替代燃料,但由于形成了致密的 Al2O3 层,阻止了氧气向铝颗粒表面的扩散,因此铝的燃烧效率非常低。在之前的实验中,在流化床中燃烧毫米大小的铝(mAl)颗粒已实现了燃烧效率的大幅提高,但仍需进一步改进。本研究调查了反应气氛对毫米级铝颗粒流化燃烧的影响。实验采用不同的 O2/H2O/CO2 浓度。实验结果表明,mAl 颗粒在流化床中的燃烧效率随着 O2、H2O 或 CO2 分子分数的增加而提高,最高燃烧效率可达 38.7%。经过对铝颗粒表面氧化膜的分析发现,在 CO2 气氛下更容易生成不稳定的θ-Al2O3,在 H2O 气氛下更容易生成不稳定的γ-Al2O3 和θ-Al2O3。不稳定的 Al2O3 薄膜更容易在流化床中被磨损,从而有效提高燃烧效率。
Combustion characteristics of millimeter-sized aluminum particles in fluidized bed under various O2/CO2/H2O atmospheres
Aluminum is an attractive alternative fuel, but it burns very inefficiently due to the formation of a dense Al2O3 layer which prevents O2 from diffusion to the surface of Al particles. In previous experiments, the combustion of millimeter-sized Al (mAl) particles in the fluidized bed has achieved a substantial increase in the combustion efficiency, but further improvements are still needed. In this study, the effects of reaction atmosphere on the fluidized combustion of mAl particles were investigated. The experiments with different O2/H2O/CO2 concentrations were conducted. The experimental results indicate that the combustion efficiency of mAl particles in fluidized bed increases as the mole fraction of O2, H2O or CO2 increases, and the highest combustion efficiency can reach 38.7%. After the analysis of the oxide film on the surface of aluminum particles, it was found that it is easier to generate the unstable θ-Al2O3 under CO2 atmosphere, and it is easier to generate the unstable γ-Al2O3 and θ-Al2O3 under H2O atmosphere. The unstable Al2O3 film is more likely to be abraded in the fluidized bed, which leads to the effective improvement of the combustion efficiency.
期刊介绍:
The word ‘particuology’ was coined to parallel the discipline for the science and technology of particles.
Particuology is an interdisciplinary journal that publishes frontier research articles and critical reviews on the discovery, formulation and engineering of particulate materials, processes and systems. It especially welcomes contributions utilising advanced theoretical, modelling and measurement methods to enable the discovery and creation of new particulate materials, and the manufacturing of functional particulate-based products, such as sensors.
Papers are handled by Thematic Editors who oversee contributions from specific subject fields. These fields are classified into: Particle Synthesis and Modification; Particle Characterization and Measurement; Granular Systems and Bulk Solids Technology; Fluidization and Particle-Fluid Systems; Aerosols; and Applications of Particle Technology.
Key topics concerning the creation and processing of particulates include:
-Modelling and simulation of particle formation, collective behaviour of particles and systems for particle production over a broad spectrum of length scales
-Mining of experimental data for particle synthesis and surface properties to facilitate the creation of new materials and processes
-Particle design and preparation including controlled response and sensing functionalities in formation, delivery systems and biological systems, etc.
-Experimental and computational methods for visualization and analysis of particulate system.
These topics are broadly relevant to the production of materials, pharmaceuticals and food, and to the conversion of energy resources to fuels and protection of the environment.