摘要
结合脱硫净烟气特点,提出分别通过脱硫净烟气中加装氟塑料换热器降温、添加蒸汽、添加冷空气3种措施建立细颗粒物凝结长大所需的过饱和水汽环境,进而增强后续高效除雾器的拦截脱除效果。数值分析了3种措施的可行性,并利用燃煤热态试验平台,对比考察了不同方式促进细颗粒物脱除的效果。结果表明:典型工况下,加装氟塑料换热器、添加蒸汽、添加冷空气三种措施均可使脱硫净烟气中细颗粒物排放浓度降低35%以上;其中,加装氟塑料换热器降温措施对脱硫净烟气原始温度变化的适应性较强,细颗粒物脱除效率基本不随脱硫净烟气原始温度的变化而改变;添加蒸汽方式不适于脱硫净烟气温度较高的场合,且耗能较大;添加冷空气方式在脱硫净烟气温度较高(≥55℃)时效果显著,但所需冷空气的温度较低,存在来源困难等问题。
Supersaturated vapor conditions for fine particle enlargement were established based on desulfurized flue gas characteristics after wet desulfurization in a condensational growth chamber (CGC) via three different methods (with heat exchanger, steam addition or cold air addition). Fine particles could be activated in supersaturated vapor and became condensation nucleus. The methods were evaluated numerically and particle removal performance was discussed using simulated coal-fired thermal system. The results indicate that the emission of fine particles can be reduced by 35% when using one of the methods. The heat exchanger method is suitable for desulfurized flue gas with different temperatures, and its removal efficiency keeps constant when the temperature of desulfurized flue gas changes. The steam addition method is not suitable for desulfurized flue gas of higher temperatures with high energy consumption, while the cold air addition method is efficient for desulfurized flue gas of higher temperatures (≥ 55 ℃), while it needs much lower cold air temperature which is difficult to obtain.
作者
杨希刚
周磊
杨林军
YANG Xi-gang;ZHOU Lei;YANG Lin-jun(School of Energy & Environment,Southeast University,Key Laboratory of Energy Thermal Conversion& Control,Ministry of Education,Nanjing 210096,China;Guodian Science and Technology Research Institute,Nanjing 210031,China)
出处
《高校化学工程学报》
EI
CAS
CSCD
北大核心
2019年第2期496-504,共9页
Journal of Chemical Engineering of Chinese Universities
基金
国家重点研发计划项目(2016YFB0600602)
关键词
水汽相变
湿法脱硫
细颗粒物
脱除
heterogeneous vapor condensation
WFGD
desulfurized flue gas
fine particle emission
removal
