摘要
实验研究借助氮吸附仪和扫描电子显微镜全面分析了循环流化床锅炉中飞灰颗粒的孔隙结构、吸附/脱附等温线、迟滞回线和孔分布等方面的特点和特性。飞灰的筛分实验和含碳量测定中,得到了循环流化床锅炉飞灰的含碳量在粒径45～25μm之间出现峰值。氮吸附实验结果表明,不同粒径段飞灰的吸附等温线近似为第Ⅱ类;飞灰的孔分布很宽,最可几孔径在4 nm左右,其中中孔所占比例最大,基本均达到60%以上,但未发现微孔的存在;中孔和大孔孔型主要为锥形孔、平行板狭缝孔和墨水瓶状孔。
The experimental study was conducted with the help of a nitrogen adsorption device and a scanning electronic microscope(SEM).The pore structure of the flying ash particles in a CFB boiler was comprehensively analyzed from the specific features and characteristics in the isothermal adsorption/desorption curves,hysteresis loop and pore distribution etc.various aspects.During the sifting test and carbon content determination,the flying ash carbon conent of the boiler was obtained,of which the peak value appeared in the particle diameter in a range of 45-25 μm.The carbon adsorption test results show that the adsorption isotherms of the flying ash in various parts of the particle diameters are approximately the Category II,the pore distribution of the flying ash is very wide and the most possible radius is about 2 nm.Among them,the medium sized pores dominate,basically reaching 60% and above.However,no micro pores are found.The large and medium sized pores are mainly of cone,parallel plate slot and ink bottle-shaped type.
出处
《热能动力工程》
CAS
CSCD
北大核心
2012年第1期71-75,136,共5页
Journal of Engineering for Thermal Energy and Power
基金
教育部高等学校博士学科点专项基金资助(20101402110011)
山西省留学人员科技活动项目择优资助经费基金资助(200912)
关键词
循环流化床锅炉
飞灰
氮吸附
孔隙结构
CFB boiler,flying ash,nitrogen isothermal adsorption,pore structure
