摘要
分析对比了工业化国家应对工业增长控制PM2.5排放的策略与技术措施,特别是荷兰在充分的技术经济性研究基础上制定50%PM减排目标、相当于9mg.m-3工业尾气颗粒物允许排放浓度标准,值得我国借鉴。工业源颗粒物排放占比前5的冶金、石油加工、化工、建材和食品加工业颗粒排放物呈现PM1.0的粒度分布峰值特征,应首选湿法静电沉降类(Wet-ESP)减排技术,但其经济性未必适合我国大规模基础工业发展阶段。提出废气-废水多相交叉流阵列变温脱除PM2.5的新方法,利用气流横掠液柱传热传质产生的速度场、温度场和浓度场推动微粒向气液界面运动,使所有单液柱均成为独立的PM2.5分离单元,其串-并联组合结构使阵列具有很高的PM2.5分离总效率。模型预测单元数n=200的交叉流阵列用于810kW大功率钻井柴油机(排气量4906kg.h-1干气)尾气碳烟PM2.5减排的效率为91.4%,现场模型试验实测值略大于80%,理论与实践均表明该方法以废治废、经济可行。
Comparative analyses were made on the strategies and technologies adopted by the industrialized countries for PM2.5 emissions control during industrial development period.It is particularly recommended for China to take the experiences of 50% PM emission reduction as the target set by the Netherlands based on sufficient investigations of cost-effective strategies,corresponding to a concentration limitation of 9 mg·m-3 waste gas from industrial sources.The emitted particulate matters,from the five highest emitting sectors of basic metal,refineries,chemicals,building materials and food processing,present the peak characteristics of PM1.0 size distribution.Correspondingly the prior technologies for emission reduction are considered to be wet electrostatic precipitators or Wet-ESP alike.However they may not be a cost-effective option for China presently during the stage of basic industrial development in large scale.A novel approach of PM2.5 removal through a temperature swing array of waste-gas and waste-water multi-phase cross-flow was proposed,employing fields of velocity,temperature and concentration generated in gas phase by heat and mass transfer crossing water columns to drive micron-particle moving towards gas-liquid interfaces.Each single water column became an independent PM 2.5 collection unit,which was regularly arranged in a series-parallel structure possessing high total efficiency of PM2.5 collection.An experiment set-up,consisting of a cross-flow array with unit number n=200,was examined in site of a drilling rig to collect soot PM 2.5 from exhausts（4906kg.h-1 dry mass） of a 810kW heavy duty diesel.The total collection efficiency was 91.4% as the model predicted,while the measured efficiency was slightly over 80%.It was proven,both by theory and practice,this approach of ＂ waste-employed waste treatment ＂ is highly cost-effective.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2013年第1期155-164,共10页
CIESC Journal
基金
国家自然科学基金项目(21276161)
中央高校基本科研专项(2010SCU22008)~~
关键词
PM2
5减排
湿法除尘
技术进展
变温多相流
交叉流阵列
PM2.5 emission reduction
wet collection
technology advances
temperature swing multiphase flow
cross-flow array
