氯化戴奧辛類化合物於燒結飛灰中之轉化行為探討

Study of the Converted Behaviors for Chlorided Dioxins in Fly Ashes

韓其霖(Chi-Lin Han)

指導教授 ： 林傑

國立屏東科技大學/工學院/環境工程與科學系所/碩士(2011年)

https://doi.org/10.6346/NPUST.2011.00165

摘要

本研究利用實驗室填充床反應系統模擬實際煙道排氣狀況下濾餅區戴奧辛生成反應，針對添加不同溴化前驅物對氯化戴奧辛之生成影響及物種濃度分佈與多重相性轉換特性進行探討。研究結果顯示，飛灰添加0.01% HgBr2、0.2% PBP 、0.1% PBP＋0.184% HgBr2，於飛灰殘餘相濃度分別為0.3 ng/g、0.5 ng/g、0.3 ng /g，未添加溴化前驅物飛灰殘餘相濃度為2.6 ng/g，顯示添加溴化前驅物後不易轉化生成氯化戴奧辛。添加0.2% PBP、0.2% PCP於飛灰殘餘相濃度發現，五氯酚比五溴酚更易生成大量氯化戴奧辛，可知氯酚化合物為氯化戴奧辛之前驅物，氯前驅物的引入含量與戴奧辛生成具正相關。飛灰添加不同溴化前驅物於飛灰介質中生成氯化戴奧辛濃度百分比在飛灰殘餘相與尾氣端氣相都是以OCDD最高。經毒性當量轉換後，生成氯化戴奧辛毒性貢獻百分比特徵剖面得知，飛灰殘餘相以呋喃類為主，2,3,4,7,8-PeCDF毒性貢獻百分比最高。尾氣端氣相方面OCDD毒性貢獻百分比最高，其中PCDFs毒性貢獻百分比有增加之趨勢。

關鍵字

空氣污染防治設備 ； 飛灰 ； 前驅物 ； 戴奧辛 ； 填充床反應器

並列摘要

Experiments were conducted by adding the bromide precursors into fly ashes in a packed bed reactor under real flue gas conditions to simulate the formation of PCDD/Fs in the filter cake zone. The contributions of toxicities and the phases transformation were the focuses of this study. The results indicated that the concentration of PCDD/Fs were 0.3ng/g、0.5ng/g and 0.3ng/g in the residue phases of fly ashes. The PCDD/Fs concentration of raw fly ash was 2.6ng/g. It suggests that adding brominated precursor has no transformation effect on the formation of PCDD/Fs in the residue phase. The experimental results indicate that adding organic chlorine source (i.e. 0.2% pentachlorophenol) into the fly ash has significantly enhancement for the PCDD/Fs in the residue phase, but adding organic bromine source (i.e. 0.2% pentabromophenol) has no benefit for the formation of PCDD/Fs. OCDD was predominant congener species of PCDD/Fs in the residue and gas phases. According to TEQ calculation, 2,3,4,7,8-PeCDF was the major contribution congener in the residue phase. OCDD was the main contribution species in the flu gas stream. The chlorinated furans were dominant compounds on the fraction of TEQ contribution.

並列關鍵字

Air Pollution Control Devices ； Fly Ash ； Precursors ； PCDD/Fs ； Packed Bed Reactor

參考文獻

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