燃煤机组烟气冷凝对可凝结颗粒脱除特性的影响

Influence of flue gas condensation on the synergistic removal of condensable particulate matter in coal-fired units

烟气冷凝回收烟气中水资源作为规模应用的主流技术,是烟气水资源回收的主要方法,该方法能使可凝结颗粒物冷凝并协同脱除。研究了脱硫出口饱和湿烟气在不同冷凝程度下对可凝结颗粒物的脱除作用,结果表明烟气冷凝系统对烟气中的可凝结颗粒物具有明显脱除作用,且随着冷凝温度降低,脱除效率升高。烟气过饱和度小于2时,随冷凝程度增加,可凝结颗粒物脱除效率增加趋势减缓,以非均相凝结为主。烟气过饱和度大于2时,随冷凝程度增加,可凝结颗粒物脱除效率增加明显,湿烟气水蒸气冷凝开始进入均相凝结。当烟气过饱和度达到3.39时,可凝结颗粒物脱除效率达81.10%。

As the mainstream technology of large-scale application,flue gas condensation recovery of flue gas water resources is the main method of flue gas water resources recovery.This method can condense condensable particulate matter and effectively achieve the synergistic removal of condensable particulate matter.The removal effect of saturated wet flue gas at the desulfurization outlet on condensable particulate matter under different condensation degrees was studied through experimental methods,so as to provide relevant reference for the control degree of condensable particle removal.The results show that the flue gas condensation system can significantly remove the condensable particulate matter in the flue gas,and the removal efficiency increases with the decrease of condensation temperature.When the flue gas supersaturation is less than 2,the increasing trend of condensable particle removal efficiency slows down significantly with the increase of condensation degree,and heterogeneous condensation is the main form at this time.When the flue gas supersaturation is greater than 2,the increasing trend of condensable particle removal efficiency is significantly strengthened with the increase of condensation degree,and the condensation of wet flue gas steam begins to enter homogeneous condensation.When the supersaturation of flue gas reaches 3.39,the removal efficiency of condensable particulate matter can reach 81.10%.