【摘要】 在炉内喷钙尾部增湿活化(LIFAC)脱硫后的低温高湿烟气中添加适量蒸汽建立蒸汽相变所需的过饱和环境,促进水汽在细颗粒物表面凝结,进而由高效除雾器脱除凝结长大的含尘液滴。采用电称低压冲击器(ELPI)实时测定细颗粒物数量浓度及粒径分布,维萨拉温湿度变送器测试烟气温度和湿度。考察了活化水添加量、蒸汽添加量、细颗粒物数量浓度及除雾器性能对应用蒸汽相变促进细颗粒物脱除的影响。结果表明,在经LIFAC脱硫后的低温高湿烟气中添加蒸汽,烟气过饱和度随蒸汽添加量的增加先增后降;应用蒸汽相变可有效促进细颗粒物脱除,其促进作用随烟气过饱和度的升高、颗粒物数量浓度的减小和除雾器效率的提高而增强。更多还原

【Abstract】 Based on the enlargement of fine particles by heterogeneous condensation,removal of particles from LIFAC(Limestone Injection into the Furnace and Activation of Calcium) desulfurization system was investigated experimentally.Supersaturation required for fine particles growth was achieved by adding adequate steam to the wet flue gas at the inlet of condensation chamber.The enlarged dusty droplets were removed by a high efficiency demister.The particle number concentration,size distribution,temperature and humidity were measured in real time by ELPI(Electrical Low Pressure Impactor) and Vaisala humidity transmitter,respectively.The influences of activation water addition amount,steam addition amount,particle number concentration and demister on the removal of fine particles were investigated.The results indicate that supersaturation improve at first and then drop with the increase of steam addition amount.The removal efficiency of fine particles can be effectively improved by heterogeneous condensation.The removal efficiency rises with the increase of supersaturation,decrease of particle number concentration and the enhancement of performance of the demister.更多还原