| 飞灰中二英热脱附行为的研究 |
| 摘要点击 1073 全文点击 1397 投稿时间：2007-02-04 修订日期：2007-03-25 |
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| 中文关键词 飞灰 二英 热脱附 毒性当量 |
| 英文关键词 fly ash PCDD/F thermal desorption TEQ |
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| 中文摘要 |
| 研究了垃圾焚烧产生的飞灰中二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英的含量分析，推测了二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. |
| 英文摘要 |
| 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℃ and 300℃, the average desorption ratio of PCDD/Fs are 96.2% and 95.5% respectively. At 400℃, the average desorption ratio of PCDD/Fs is 99.7%. The experiment results show that the PCDD/Fs is dechlorinated at 300℃. At 400℃, a lot of precursor reactions happen in the fly ash, which enhance the content of PCDD/Fs. |
