摘要
将45<sup>6</sup>3μm和90<sup>1</sup>50μm的方解石矿物在空气与氧/燃料条件下进行沉降炉实验,研究了燃烧气氛、颗粒粒径以及SO<sub>2</sub>对方解石转化行为的影响。研究表明:方解石颗粒在氧/燃料燃烧条件下发生破碎,气氛中CO<sub>2</sub>浓度越高,方解石的破碎越弱;方解石样品粒径越大,破碎越明显。气氛中CO<sub>2</sub>的浓度越高,CaCO<sub>3</sub>的分解越弱,90<sup>1</sup>50μm的方解石分解程度大于45<sup>6</sup>3μm的方解石。气氛中存在体积分数为0.3%的SO<sub>2</sub>时,氧/燃料燃烧条件下CaSO<sub>4</sub>的生成量大于空气燃烧气氛,SO<sub>2</sub>的存在促进CaCO<sub>3</sub>的转化。
The effects of oxy-fuel combustion,particle size and SO_2 on the transformation behavior of calcite were investigated by experiments on a lab-scale drop tube furnace.Calcite samples of45~63 μm and 90~150 μm were treated under different combustion conditions.The results show that fragmentation of calcite samples takes place under oxy-fuel combustion.Particle fragmentation decreases with increasing CO_2 concentration.The calcite fragmentation degree also increases with increasing sample particle size.The fraction of CaCO_3 that is transformed decreases when the concentration of CO_2 increases;it is higher for the sample of 90-150μm than that of 45~63 um.When0.3%(volume fraction) SO_2 is added into the atmosphere,the content of CaSO_4 in the residues under oxy-fuel conditions is higher than air conditions.Moreover,the fraction of CaCO_3 that is transformed under all conditions increases when SO_2 is added.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2014年第6期1240-1243,共4页
Journal of Engineering Thermophysics
基金
国家自然科学基金(No.51376071)
国家重点基础研究发展计划(973计划)(No.2013CB228501)
新世纪优秀人支持计划资助(No.NCET-11-0192)
关键词
氧/燃料燃烧
方解石
破碎
分解
硫酸盐化
oxy-fuel combustion
calcite
fragmentation
decomposition
sulfation
