摘要
气溶胶问题已成为氨法烟气脱硫工艺推广应用的技术瓶颈,通过对氨法脱硫气溶胶化学组分及其粒径进行实时监测,考察了脱硫运行阶段、脱硫液氧化程度及p H值的影响,并试验分析了氨法脱硫过程中气溶胶的形成机理。结果表明,氨法烟气脱硫气溶胶主要为亚微米级颗粒,组分以含硫酸根、铵根为主,集中在0.1~0.4μm之间。脱硫初始阶段,气溶胶组分中存在NH4HSO4和NH4HSO3,正常运行阶段,气溶胶组分以（NH4）2SO4和（NH4）2SO3为主。脱硫浆液未进行曝气氧化,气溶胶组分中SO32-为主,充分氧化后,SO42-含量明显增加;提高脱硫浆液p H值,气溶胶组分中SO32-含量增加。非均相反应形成的气溶胶组分中存在NH4HSO4、NH4HSO3;脱硫液滴的夹带和蒸发作用形成的气溶胶成分主要为（NH4）2SO4和少量（NH4）2SO3。非均相反应对于气溶胶的形成占主要贡献,数量浓度与质量浓度均高于单纯夹带蒸发。
In order to solve the problem of aerosol emission,aerosol properties were investigated on-line. Experiments on the effect of different desulfurization phases,oxidation degree and p H value of desulfurization liquid and the analysis of the aerosol formation were carried out. The results showed that aerosols are mainly submicron particles ranging from 0. 1 μm to 0. 4 μm. NH4HSO4 and NH4HSO3exist during the initial phase of desulfurization,while（ NH4）2SO4and（ NH4）2SO3are the main part when the system is in good running. Without oxidation of desulfurization liquid,the aerosol compositions are mainly SO32-and the amount of SO42-increases significantly after oxidation. The amount of SO32-increases when the p H value of desulfurization liquid gets higher. NH4HSO4 and NH4HSO3exist in the aerosols formed by the heterogeneous reaction which makes greater contribution to the aerosol formation and the compositions of aerosols formed by entrainment and evaporation of desulfurization.
出处
《四川大学学报（工程科学版）》
EI
CAS
CSCD
北大核心
2015年第6期204-209,共6页
Journal of Sichuan University (Engineering Science Edition)
基金
国家海洋局海洋-大气化学与全球变化重点实验室开放基金资助项目(GCMAC1104)
国家自然科学基金资助项目(51176034
21106018
21276049)
国家重点基础研究发展规划基金资助项目(2013CB228505)
国家高技术研究发展计划资助项目(2013AA061604)
江苏省自然科学基金资助项目(BK20130906)
江苏省高校自然科学基金资助项目(13KJB610011)
关键词
氨法烟气脱硫
气溶胶
气溶胶质谱
实时探测
ammonia flue gas desulfurization
aerosol
aerosol mass spectrometry
on-line measurement
