摘要
为探究SO_2与NH_3/NO体积比对SCR脱硝中PM_(2.5)排放特性的影响,通过模拟SCR脱硝试验装置,针对商业V_2O_5-WO_3/Ti O_2催化剂,利用电称低压冲击器(ELPI)等仪器对SCR脱硝装置出口PM_(2.5)物性进行了测试分析。结果发现,SCR脱硝装置出口细颗粒物数浓度达到1.0×10~6个/cm^3左右,其主要成分为NH_4HSO_4及少量(NH_4)_2SO_4,且细颗粒物多为亚微米级。同时研究了SO_2催化氧化对PM_(2.5)形成的影响,并采用傅里叶原位红外光谱(FTIR)研究了氨氮体积比对PM_(2.5)生成的影响机理。结果表明,SO_2的影响与SO_2氧化生成的SO_3浓度与颗粒物数浓度显著相关,氨氮体积比的浓度对形成的颗粒物数浓度有直接影响,而且对SO_2氧化率也有一定影响。
Based on V2O5-WO3/TiO2 catalyst ,physical properties of PMz. 5 in outlet flue gas of SCR are tested and analyzed by Electrical Low Pressure Iimpactor （ELPI） through SCR DeNOx simulation test device. The result indicates that the number concentration of fine particles which are inostly submicron reaches about 1.0 × 106/cm3. These fine particles mainly consists of NH4HSO4 and some （NH4 ）2SO4. Moreover,the effect of SO2 oxidation on PM2. 5 formation is also studied. Fourier Transform infrared spectroscopy（FTIR） is applied to study the influence of NH3/NO. The results point out that there is a significant correlation between SO3 concentration generated by SO2 oxidation and number concentration of particle. In addition, volumetric ratio of NH3/NO not only directly relates to the number concentration of particles, but also affects SO2 oxidation.
出处
《现代化工》
CAS
CSCD
北大核心
2016年第2期90-94,共5页
Modern Chemical Industry
基金
国家重点基础研究发展规划(973计划
2013CB228505)
