摘要
以某电厂脱硝催化剂为研究对象,利用催化剂脱硝效率评价装置对4个不同运行时间的催化剂进行实验研究,分析得到催化剂孔隙结构对脱硝效率的影响。研究发现：SCR运行时间从3 700 h增加到48 000 h,比孔容积降低25%,比表面积下降约一半,催化剂脱硝效率下降12%；催化剂的孔隙结构、孔径分布发生改变,占优势的直径为10～30 nm的孔积灰堵塞严重,比例下降,50～150 nm的大孔部分比例增加,平均孔径增大28.6%。物相分析表明运行时间越长飞灰在催化剂表面粘附沉积越严重。
In this paper,four De-NOx catalysts with different operation-time which running in a power plant were chosen as the subject. By using a evaluation device of denitration efficiency to do experimental research on catalysts,we could find out how the pore structure of catalysts effects on the denitration efficiency. The study found that the catalysts which running 48 000 h was reduced by 25% in specific pore volume,46. 5% in specific surface area and 12%in denitration efficiency. The catalyst pore structure and pore size distribution changed. The dominant diameter of10 ～ 30 nm hole deposited by ash seriously and declined in proportion of pore. Moreover,the proportion of 50 ～150 nm increases. The average pore size of those pore increased by 28. 6%. Phase analysis shows that the more running time of the catalysts,the more seriously adhesion deposition of the surface.
出处
《华北电力技术》
CAS
2014年第6期24-28,共5页
North China Electric Power
关键词
脱硝催化剂
孔隙结构
飞灰
脱硝效率
denitrification catalysts
pore structure
fly-ash
denitration efficiency
