温度和气氛对PAHs由从头合成反应生成PCDD/Fs的作用  

Influences of Temperature and Atmosphere on PCDD/Fs Formation from PAHs via de Novo Synthesis Reaction

作　　者：尹雪峰[1] 李晓东[1] 罗建松[1] 陆胜勇[1] 谷月玲[1] 严建华[1] 倪明江[1] 岑可法[1] 

机构地区：[1]浙江大学能源清洁利用国家重点实验室,杭州310027

出　　处：《燃烧科学与技术》2008年第2期117-121,共5页Journal of Combustion Science and Technology

基　　金：国家自然科学基金(N50576082);国家重点基础研究发展计划(973)资助项目(G1999022211)

摘　　要：城市生活垃圾焚烧炉产生的多氯二苯并二恶英(PCDDs)和多氯二苯并呋喃(PCDFs),是一类剧毒的持久性有机污染物(POPs).多环芳烃是城市生活垃圾焚烧炉上二恶英生成的一种主要的碳源.在小型试验用固定床反应器上,研究了温度和燃烧气氛中氧对多环芳烃在模拟飞灰(MFA)的催化下,由从头合成反应生成二恶英的作用.烟气样品参照USEPA1613方法收集,并采用高分辨色谱,低分辨质谱仪进行分析.给出了反应中生成的二恶英的分布特征与温度、氧含量的关系,二恶英的分布特征包括二恶英的总排放量、毒性当量(TEQ)和PCDDs/PCDFs的比例.结果显示,PAHs反应生成的PCDFs的量要比PCDDs高出几倍,在二恶英的生成过程中存在一个最优化的温度区间和氧含量范围,二恶英的毒性当量随着氧含量的增加而增大,并讨论了温度和燃烧气氛的作用机制.Polychlorinated dibenzo-p-dioxins（PCDDs） and polychlorinated dibenzofurans（PCDFs） are known as toxic persist organic pollutants（POPs） emitted from municipal waste incinerators. Polycyclic aromatic hydrocarbons（PAHs） are one of the major carbon sources for PCDD/Fs in MWI. A laboratoly-scale fixed-bed reactor was used to study the influence of temperature and oxygen content on the PCDD/Fs formation from PAHs on model fly ash（MFA） via de novo synthesis reaction . Flue gas samples were collected and analyzed on HRGC/LRMS based on the USEPA1613 method. The relationship between the PCDD/Fs distribute characters and temperature and oxygen content was given, the PCDD/Fs distribute characters including total PCDD/Fs yields from PAHs ,PCDD/Fs toxic equivalent quantity（TEQ） and PCDDs/PCDFs ratio. The results show that PCDFs yields from PAHs are several times higher than those of PCDD. Tncre have been an optimum temperature zone and oxygen content extent in the combustion air during the PCDD/Fs formation process. It has been found that I-TEQ values of PCDD/Fs increase with the increase of oxygen content. And the effective mechanism of temperature and atmosphere was discussed.

关 键 词：多氯二苯并二恶英 多氯二苯并呋喃 多环芳烃 从头合成反应 温度 氧 

分 类 号：TK229[动力工程及工程热物理—动力机械及工程]