摘要
在某750 t/d生活垃圾焚烧线上,在排放口NO_x≤75 mg/m^(3)条件下,分别采用氨水和自主研发的PNCR高分子脱硝剂,开展了SNCR和PNCR脱硝过程氮氧化物迁移转化过程研究。结果表明:SNCR和PNCR都具有较高的脱硝效率,可达76%,满足环保达标排放的要求;SNCR和PNCR高温区(870~590℃)和中温区(612~371℃)都存在明显的脱硝反应,且高温区脱硝率明显高于中温区脱硝率,是脱硝的主要反应区;SNCR和PNCR低温区(388~150℃)几乎不存在脱硝作用;PNCR中温区脱硝效率高于SNCR中温区脱硝效率;SNCR在高温区36.2~23.6 m是最优脱硝温区,PNCR在高温区23.6~33.7 m是最优脱硝温区,PNCR最优脱硝温区比SNCR存在明显下移趋势;SNCR和PNCR的氨氮摩尔比(NSR)均为3.0,脱硝剂利用率R分别为23.4%、24.7%,需要对SNCR和PNCR做出进一步的优化以获得更低的NSR和更高的R。
Using ammonia water and self-developed PNCR denitration agent,NO_(x) migration and transformation of SNCR and PNCR were studied at the set emission requirement of NO_(x)≤75 mg/m^(3) on a 750 t/d MSW incineration line.The results showed that both SNCR and PNCR had a high total denitration efficiency and reached up to 76%,which could meet the requirements of environmental protection standards.Both SNCR and PNCR had obvious denitration reactions at high-temperature(870~590℃)and middle-temperature(612~371℃)zone,and the denitration efficiency of SNCR and PNCR at the high temperature zone was obviously higher than that of the middle-temperature zone,it was the main reaction zone of denitration.At the low-temperature zone(388~150℃),no denitration of SNCR and PNCR was found.The denitration efficiency of PNCR at the middle-temperature zone was higher than that of SNCR.The most of SNCR denitration reaction occurred at the high-temperature zone of 23.6~36.2 m,and the most of PNCR denitration reaction occurred at the high-temperature zone of 23.6~33.7 m.The optimal denitration temperature zone of PNCR had an obvious downward trend than that of SNCR.The NSR of both SNCR and PNCR was 3.0,R was 23.4%and 24.7%respectively,so further optimization study on SNCR and PNCR is necessary to make the lower NSR and the higher R.
作者
栗博
韩志明
安璐
LI Bo;HAN Zhiming;AN Lu(Beijing China Sciences Runyu Environmental Technology Co.Ltd.,Beijing 100080)
出处
《环境卫生工程》
2023年第S01期17-25,共9页
Environmental Sanitation Engineering
关键词
垃圾焚烧
脱硝
SNCR
PNCR
迁移转化
MSW in cineration
denitration
SNCR
PNCR
migration and transformation
