水汽相变耦合撞击流作用下细颗粒物的脱除特性  

Removal of fine particles from coal combustion by heterogeneous condensation coupled with coaxial impinging streams

作　　者：熊桂龙[1,2] 杨林军[1,2] 郭惠[1,2] 彭飞[1,2] 赵汶[1,2] 

机构地区：[1]东南大学能源与环境学院,南京210096 [2]东南大学能源热转换及其过程测控教育部重点实验室,南京210096

出　　处：《东南大学学报（自然科学版）》2012年第5期904-909,共6页Journal of Southeast University：Natural Science Edition

基　　金：国家高技术研究发展计划(863计划)资助项目(2008AA05Z306);江苏省自然科学基金资助项目(BK2008283)

摘　　要：采用水汽相变和撞击流耦合的方法,研究了烟气对喷水平间距、烟气流速、水蒸气添加量等参数对细颗粒脱除效率和相变脱除后烟气中细颗粒中位粒径的影响,并分析测试了相应条件下系统的流体阻力和除雾器的压力降.结果表明:细颗粒脱除效率随烟气对喷水平间距的增加先增大后减小,随烟气流速和蒸汽添加量的增大而增大;相变脱除后烟气中细颗粒中位粒径的变化规律与细颗粒脱除效率的变化规律相反;系统阻力和除雾器的压降均随烟气流速的增大而增大;随烟气对喷间距的增大,系统阻力减小,除雾器的压降基本保持不变.撞击流相变室的系统阻力小,细颗粒物脱除效率高,因此,蒸汽相变耦合撞击流是一种用于脱除细颗粒物的切实可行的方法.The influences of the horizontal gap between the opposing impinging, the flue gas veloci- ty and the addition amount of steam on the removal efficiency and the number median diameter of fine particles were analyzed, and the system resistance and the pressure drop of demister were inves- tigated experimentally by using impinging streams coupled with heterogeneous condensation growth technology. The experimental results show that the increase in the horizontal gap between the oppo- sing impinging causes an increased firstly but then decreased removal efficiency. And with the in- crease of the flue gas velocity and the addition amount of steam, the removal efficiency becomes higher and particle number median diameter is smaller. The variation of the number median diameter of fine particles is just contrary to that of the removal efficiency. Both the system resistance and the pressure drop of demister increase with the increase of the flue gas velocity. With the horizontal gap between the opposing impinging increasing, the system resistance decreases, but the pressure drop of demister almost keep stable. The system fluid resistance which is mainly consumed on demister is moderate and acceptable. The technology coupling impinging streams with heterogeneous condensati- onal growth can bring high removal efficiency of fine particles and causes low power consumption, which makes it feasible and promising.

关 键 词：细颗粒物 蒸汽相变 撞击流 脱除 压力降 

分 类 号：X51[环境科学与工程—环境工程]