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飞灰中二英热脱附行为的研究
引用本文:张峰,张海军,陈吉平,梁鑫淼.飞灰中二英热脱附行为的研究[J].环境科学,2008,29(2):525-528.
作者姓名:张峰  张海军  陈吉平  梁鑫淼
作者单位:中国科学院大连化学物理研究所,大连,116011
基金项目:国家高技术研究发展计划(863计划)
摘    要:研究了垃圾焚烧产生的飞灰中二噁英在隔绝空气受热条件下的热脱附行为及规律.通过气相和固体残留中二噁英的含量分析,推测了二噁英在不同温度条件下可能发生的几种化学反应和物理变化,同时研究了17种有毒二噁英的热脱附效率和飞灰的最佳热脱附条件.PCDD/Fs在200℃和300℃下平均脱附率分别为96.2%和95.5%,而400℃下的平均脱附率高达99.7%.结果表明,在300℃加热条件下,飞灰中的PCDD/Fs主要发生脱氯降解反应.在400℃下,飞灰中发生大量的前体合成反应,使PCDD/Fs含量显著增加.

关 键 词:飞灰  二噁英  热脱附  毒性当量
文章编号:0250-3301(2008)02-0525-04
收稿时间:2/4/2007 12:00:00 AM
修稿时间:2007-03-25

Thermal Desorption Behavior of PCDD/Fs on the Fly Ash
ZHANG Feng,ZHANG Hai-jun,CHEN Ji-ping and LIANG Xin-miao.Thermal Desorption Behavior of PCDD/Fs on the Fly Ash[J].Chinese Journal of Environmental Science,2008,29(2):525-528.
Authors:ZHANG Feng  ZHANG Hai-jun  CHEN Ji-ping and LIANG Xin-miao
Institution:Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116011, China. zf1879@dicp.ac.cn
Abstract:The article studied the thermal desorption behavior of PCDD/Fs on the fly ash under anoxic conditions. From the analysis of the PCDD/Fs concentrations in the gas phrase and solid residual, the several kinds of potential chemical reaction and physical changes of dioxin that occur at the different temperature are concluded. At the same time, desorption ratios of 17 toxic dioxin congers and the better desorption conditions are studied. At 200 degrees C and 300 degrees C, the average desorption ratio of PCDD/Fs are 96.2% and 95.5% respectively. At 400 degrees C, the average desorption ratio of PCDD/Fs is 99.7%. The experiment results show that the PCDD/Fs is dechlorinated at 300 degrees C. At 400 degrees C, a lot of precursor reactions happen in the fly ash, which enhance the content of PCDD/Fs.
Keywords:fly ash  PCDD/F  thermal desorption  TEQ
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