CAJ | 학술논문

随着我国城市化和工业化进程日益加快，PM2.5细颗粒物污染已成为突出的环境问题，采用凝并技术使小颗粒凝并为大颗粒成为提高除尘效率、降低PM2.5细颗粒物排放的主要途径。本文采用计算流体力学(CFD)群体平衡模型及自由分子凝并核模拟了细颗粒物的凝并过程，分析了凝并器出口粒径分布的动态演化规律，考察了停留时间及凝并器入口固含率对凝并效果的影响。模拟结果表明，凝并器出口处的平均粒径经历了一个从零开始逐渐增大后趋于稳定的演化过程；在入口固含率为10-6的条件下，颗粒粒径越小，凝并效果越显著，当入口颗粒粒径增大至2.0μm时，颗粒的凝并几乎可以忽略；凝并器出口平均粒径近似与入口固含率的1/3次方及细颗粒物在凝并器中的平均停留时间成正比。
수착아국성시화화공업화진정일익가쾌，PM2.5세과립물오염이성위돌출적배경문제，채용응병기술사소과립응병위대과립성위제고제진효솔、강저PM2.5세과립물배방적주요도경。본문채용계산류체역학(CFD)군체평형모형급자유분자응병핵모의료세과립물적응병과정，분석료응병기출구립경분포적동태연화규률，고찰료정류시간급응병기입구고함솔대응병효과적영향。모의결과표명，응병기출구처적평균립경경력료일개종령개시축점증대후추우은정적연화과정；재입구고함솔위10-6적조건하，과립립경월소，응병효과월현저，당입구과립립경증대지2.0μm시，과립적응병궤호가이홀략；응병기출구평균립경근사여입구고함솔적1/3차방급세과립물재응병기중적평균정류시간성정비。
Along with the fast urbanization and industrialization process of our country, the pollution of PM2.5 fine particles became a prominent environmental problem. The aggregation technology, which was used to make fine particles aggregate to larger particles, was the main way to improve the dust removal efficiency and reduce emissions of PM2.5 fine particles. In this paper, the aggregation process of fine particles was simulated by free molecular aggregation kernel and Population Balance Model of Computational Fluid Dynamics, the dynamic evolution of particle size distribution at the export of the aggregation reactor was analyzed, the effect of residence time and solid holdup to particles’ aggregation was investigated. The simulation results show that the average particle size at the export of the aggregation reactor undergone a evolution process of increasing gradually from zero and then tending to be stable;when the solid holdup at the entrance was 10-6, the smaller the particle size, the more significant effect of particles’ aggregation, when the particle size increased to 2.0 μm, the effect of aggregation was almost negligible;the average particle size at the export of the aggregation reactor was approximately proportional to 1/3 of the solid holdup at the entrance and the average residence time of particles in the aggregation reactor.