摘要
针对传统除尘设备对0.1~2μm微细颗粒物的超低脱除能力,本文首次提出了将湿式相变凝聚除尘与湿式静电除尘两者结合,以强化微细颗粒之间的团聚与长大而实现高效脱除的新型除尘方法。基于饱和烟气中可凝结气体的强制相变冷凝作用原理,同时考虑惯性、拦截、布朗扩散和热泳力作用等综合脱除机制,自行开发与设计了湿式相变凝聚器。该装置协同湿式电除尘器在江苏省某600 MW机组进行了工程化示范研究,并采用低压撞击器得到了凝聚器开关状态下系统进、出口的颗粒物粒度分布。结果表明:饱和烟气的相变冷凝与柔性管排的合理布置可明显提高微细颗粒物的凝聚效果;加装湿式相变凝聚器可以显著增加微细颗粒物的脱除效率,同时能够保证系统出口颗粒物排放浓度小于2 mg·m^(-3)。该技术的提出为燃煤烟气的"近零排放"指出了新的发展方向。
Aiming at the lower removal efficiency of traditional dust removing equipment for fine particulate matters with diameter of 0.1-2 μm, a new removal technology on combining the wet phase transition agglomeration with wet electrostatic precipitator, to enhance the agglomeration and growing up of fine particles, was proposed at first time. The wet phase transition agglomeration device was self-designed, based on the forced condensation principle of flue gas and considering the coupling effect of inertial, intercept, brown diffusion and thermophoresis force on removing particles. The agglomeration device has been applied to a 600 MW coal-fired power plant in Jiangsu Province. The particle size distribution at the inlet and outlet was tested by using Dekati Low Pressure Impactor （DLPI） when the agglomeration device was on or off. The results showed that the condensation of the saturated flue gases, and the optimal arrangement of fiuoroplastic tubes could improve significantly the agglomeration of fine particles. The higher efficiency of fine particle was obtained when the agglomeration device was applied.The final particle emission concentration of this plant with this agglomeration device was less than 2 mg·m^-3. The proposed technology would be one of the removal methods to realize the ultra-low emission of particles for coal-fired power plants in future.
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2016年第12期2710-2714,共5页
Journal of Engineering Thermophysics
基金
国家自然科学基金资助项目(No.91544108,No.51376147)
关键词
湿式相变凝聚
湿式电除尘器
微细颗粒物
脱除
wet phase transition agglomeration
wet electrostatic precipitator
fine particulate matter
removal
