摘要
在固定床反应器中考察了强氧化剂KMnO4作为添加剂对钙基吸收剂同时脱硫脱硝的调质效果。实验结果表明,不含KMnO4时钙基吸收剂不能有效脱除NO,而当KMnO4存在Ca/(S+0.5N)为1.8时,钙基吸收剂可获得31.4%的脱硫率和13.5%的脱硝率。实验还研究了各种参数变化对脱硫率和脱硝率的影响,反应温度升高能够促进SO2的脱除,但脱硝率对温度的变化不敏感;脱硫率随着烟气相对湿度的增加而增加,但脱硝率与相对湿度的关系不是单调的,存在一个最大值;O2是脱除NO的必要条件。结合气体分析和产物分析的实验结果发现,NO被脱除的机理是先被氧化为NO2,然后再与吸收剂和脱硫产物反应生成了硝酸盐和亚硝酸盐。为半干法脱硫技术中加入脱硝功能的可能性提供参考依据。
The simultaneous SO2/NO removal by calcium based absorbent with KMnO4 as additive was studied in a fixed-bed reactor at a low temperature. The experimental results showed that KMnO4 could promote NO removal by calcium hydroxide, and the efficiency of SO2 and NO removal could reach 31.4% and 13.5% respectively while the stoichiometric ratio of Ca/ （S＋0.5N） was 1.8. A higher temperature improved SO2 capture, but had little influence on NO removal. The presence of water vapor and oxygen in the gas is necessary for NO removal by the absorbent, and SO2 removal efficiency increased with increasing relative humidity which had an optimal value for NO removal. The results of XRD and IC analysis on the products showed the NO removal mechanism, that NO was firstly oxidized into NO2 , and then removed by reacting with calcium hydroxide or calcium sulfite into nitrate and nitrite.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2007年第7期1810-1815,共6页
CIESC Journal
关键词
同时脱硫脱硝
钙基吸收剂
添加剂
固定床
SO2/NO simultaneous removal
calcium absorbent
additive
fixed bed
