摘要
在一台小型沉降炉上进行了氨水喷射还原模拟烟气中NOx的选择性非催化还原(selectivenon-catalyticreduction,SNCR)实验研究,同时结合绝热预混模型进行了化学动力学模拟,研究了采用氨水喷射的SNCR技术的诸多影响因素.研究表明:采用该技术最高可以达到82.1%的NOx还原率,氨水喷入点的最佳温度范围为700～950℃,炉内最佳的停留时间为0.8s,随着NH3/NO摩尔比的增加NOx还原率逐渐升高,但未反应的NH3造成的泄漏也会随之增加,最佳的NH3/NO摩尔比应控制在1.5～3.0.从数值模拟与试验结果的对比情况来看,为达到模拟结果的理论值,试验当中应采取措施强化氨水与烟气的混合过程,同时烟气成分中大量的CO和较低的O2可以促进NO还原率的进一步提高,另外从运行成本的角度来看,同样是经济合算的.
Experiments were carried out to study the NOx reduction efficiency of the SNCR (selective no-catalytic NOx reduction) technology using ammonia injection. The experimental data on a laboratory scale drop tube furnace showed that the highest NOx reduction efficiency of about 82.1% was achieved. The best NOx reduction performance occurred at temperature of 700-950°C and residence time of 0.8 s. The NOx reduction increased with increase of NH3/NO. Considering the risk of NH3 slip, the optimal NH3/NO value should be varied between 1.5-3.0. A chemical kinetics simulation was conducted to investigate the effects of the parameters on the NOx reduction efficiency. Comparison between experimental and numerical methods show that the mixing between the ammonia and the flue gas had great effect on the NOx reduction. Large amounts of CO and less of O2 can improve the NOx reduction efficiency. The technology-economics analysis shows that the SNCR technology has bright prospects.
出处
《浙江大学学报（工学版）》
EI
CAS
CSCD
北大核心
2004年第4期495-500,共6页
Journal of Zhejiang University：Engineering Science
