Variation of nitrate and nitrite in condensable particulate matter from coal-fired power plants under the simulated rapid condensing conditions.
Variation of nitrate and nitrite in condensable particulate matter from coal-fired power plants under the simulated rapid condensing conditions.
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DOI：
10.1016/j.chemosphere.2023.137934
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发表时间：
2023-01
期刊：
影响因子：
8.8
通讯作者：
Zhongyi Sheng;Fuyang Zhang;Tong Wu;Liu Yang
中科院分区：
文献类型：
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作者：
Zhongyi Sheng;Fuyang Zhang;Tong Wu;Liu Yang
为探讨超低排放燃煤电厂排放的可凝颗粒物（CPM）中硝酸根离子（NO3-）和亚硝酸根离子（NO2-）的形成机理，研究了凝结温度、H2O蒸汽、SO2、SO 3和NH3对CPM中硝酸根离子（NO3-）和亚硝酸根离子（NO2-）的影响。结果表明：（1）随着冷凝温度的降低，NO3-和NO2-的浓度增加，H2O蒸汽也能促进NO3-和NO2-的生成。(ii)SO2和SO 3的影响在不同的烟气饱和状态下是不同的，这是由于SO2和NOX的氧化还原反应或H2SO 4的形成引起的。(iii)NH3对NO3-和NO2-的成核有促进作用，SO2和SO 3的存在也有促进作用。值得一提的是，SO 3和SO2可能协同抑制NO3-和NO2-的形成，而与NH3的存在无关。研究结果将丰富人们对CPM中NO3-和NO2-的化学和物理特性的认识，并为燃煤电厂CPM排放的控制提供基本参考。
In this work, condensation temperature, H2O vapor, SO2, SO3and NH3were studied to explore the formation mechanism of nitrate ions (NO3−) and nitrite ions (NO2−) in condensable particulate matter (CPM) discharged by ultra-low emission coal-fired power plants. Some important results were obtained: (i) The concentration of NO3−and NO2−increased with the decrease of condensation temperature, and H2O vapor could also promote the formation of NO3−and NO2−. (ii) The effects of SO2and SO3varied at different saturated states of flue gas, which was caused by the redox reaction of SO2and NOXor the formation of H2SO4. (iii) NH3could promote the nucleation of NO3−and NO2−, and the promotion effect also existed in the existence of SO2or SO3. It is worth mentioning that SO3and SO2might synergistically inhibit the formation of NO3−and NO2−, regardless of the presence of NH3. The research results would enrich peoples understanding of the chemical and physical characteristics of NO3−and NO2−in CPM and provide a basic reference for the control of CPM emitted from coal-fired power plants.