摘要
催化剂性能检测对火电厂烟气脱硝运行和管理有重要意义。选取了某电厂运行23 500 h的波纹板式催化剂(旧催化剂)和同品牌新催化剂,采用XRF,XRD,H2-TPR,DRIFT等手段进行微观性能表征并测试了其活性。结果表明:与新催化剂相比,旧催化剂中Fe、K、Na和Mg等元素的含量明显增多,比表面积和孔容分别下降了38.7%和14.3%,氧化还原性能和Bronsted酸性位数目均有较大程度的下降,脱硝效率由原来的96.2%下降为91.3%,活性系数下降25.3%;烟气飞灰中碱金属和碱土金属的毒害作用是催化剂活性下降的主要原因。指出:波纹板式催化剂易被飞灰堵塞,应保持催化剂吹灰装置良好运行,并利用机组停运机会对催化剂进行清灰,以提高脱硝效率和延长催化剂使用寿命。
Catalyst performance determination is important to the operation and management of flue gas denitrification in power plants. The microcosmic properties and activities are compared between the V2O5-WO3/TiO2 corrugated SCR catalyst which was already used for 23 500 h with the fresh one through XRF, XRD, H2-TPR and DRIFT analysis. The results show that, compared with the fresh catalyst, the Fe, K, Na, Mg contents in the used one are much greater, while its BET surface area and pore volume are decreased by 38.7% and 14.3% respectively. In addition, the redox activity and Br？nsted acid strength decline remarkably; the de-NOx efficiency decreases from 96.2% to 91.3%; and the activity coefficient drops by 25.3%. The deactivation analysis indicates that the blockage and poisoning effects of alkali metal and alkali earth metal elements in the ash deposits are the main reasons of the deactivation. Since the corrugated SCR catalyst is easily clogged by the fly ash, the soot-blower should be maintained in good operation conditions. The dust-cleaning during downtime should be performed to improve the de-NOx efficiency and extend the catalyst lifetime.
出处
《中国电力》
CSCD
北大核心
2016年第1期141-145,共5页
Electric Power
基金
国家自然科学青年基金资助项目:异质复合材料光热协同催化脱除氮氧化物的性能与机理研究(21403210)
宁波市科技创新团队资助项目(2011B82003)~~
关键词
烟气脱硝
选择性催化还原(SCR)
波纹板式催化剂
性能检测
失活
表征
flue gas denitrifieation
selective catalytic re（luetion （SCR）
corrugated eatalysts
performance determination
deacivation
characteristie
