摘要
在自制的试验台上对碳酸氢铵作还原剂的选择性非催化还原工艺及不同添加剂对其脱硝行为改善进行了研究,并分析了其机理.试验发现氨氮比为1.25时,以NOx去除率高于50%为标准,工艺的温度窗口为860-980℃,最优温度为935℃,得到NOx去除率为74.63%.在最优温度条件下,随着氨氮比的增大,NOx去除率增大,当氨氮比大于1.0后,NOx去除率增大的幅度较小.以CH4作添加剂时,温度窗口明显向低温方向移动,最优温度变为880℃,NOx去除率略有降低.在以Na2CO3和NaOH为添加剂时,工艺的温度窗口基本不变,随着添加剂添加量的增大,NOx的去除率增大.以CH3COONa为添加剂时,除NOx去除率增大外,工艺的温度窗口略向低温方向移动.
Experimental study of selective non-catalytic reduction process with ammonium bicarbonate as reducing agent under various additives has been carried out and the reaction mechanism has been analyzed.Taking NOx removal efficiency higher than 50%,with a mole ratio η of [NH4HCO3]/=1.25 as standard and under a temperature window of 860 to 980 ℃,the NOx removal efficiency is up to 74.63% under an optimum temperature of 935 ℃.Under this optimum temperature,the NOx removal efficiencies increase with η,but not significantly when η〉1.0.With CH4 as the additive,the optimum temperature shifts to 880 ℃ and the NOx efficiency becomes lower.With NaOH and Na2CO3 as the additives,the temperature window does not change obviously and NOx removal efficiencies increase with the addition of the additives.With CH3COONa as the additive,the temperature window shifts to lower a little and the NOx removal efficiencies increase also with the addition of the additives.
出处
《南京大学学报（自然科学版）》
CAS
CSCD
北大核心
2010年第5期588-595,共8页
Journal of Nanjing University（Natural Science）
基金
国家高技术研究发展计划(2008AA05Z303)
关键词
选择性非催化还原技术
脱硝
碳酸氢铵
添加剂
elective non-catalytic reduction
denitrification
ammonium bicarbonate
additive
