| 研究生: |
謝佳龍 Hsieh, Jia-Long |
|---|---|
| 論文名稱: |
聚乙烯塑膠廢棄物中添加礦石粉對焚化煙道廢氣多環芳香烴化合物減量之研究 Reduction of PAHs Emission in the Flue Gas of PE Plastic Waste Incineration |
| 指導教授: |
李俊德
Li, Chun-Teh 李文智 Lee, Wen-Jhy |
| 學位類別: |
碩士 Master |
| 系所名稱: |
工學院 - 環境工程學系 Department of Environmental Engineering |
| 論文出版年: | 2002 |
| 畢業學年度: | 90 |
| 語文別: | 中文 |
| 論文頁數: | 173 |
| 中文關鍵詞: | 焚化 、多環芳香烴 、聚乙烯塑膠 、煙道廢氣 、天然礦石粉 |
| 外文關鍵詞: | Incinerator, Stack flue Gas, PAHs, Mineral Stone Powder PE Plastic |
| 相關次數: | 點閱:76 下載:2 |
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中 文 摘 要
本研究是以一套固定床式焚化爐進行聚乙烯(Polyethylene)塑膠廢棄物之批次焚化實驗,藉由三個階段實驗中不同的批次進料,來瞭解天然有機酵素和天然礦石粉對焚化煙道廢氣中所含多環芳香烴化合物(Polycyclic Aromatic Hydrocarbons,簡稱PAHs)之減量效果。煙道廢氣粒狀物相與氣相PAHs是以Auto5TM自動煙道道採樣器配合冷卻系統進行等速抽引採樣,在二十一種個別PAHs的分析上則以氣相層析質譜儀(GC/MS)進行定性及定量的測定。
在第一階段實驗中,藉由改變第一、第二燃燒室的供風量及第二燃燒室的焚化溫度等操作條件,獲得本固定床式焚化爐在進行聚乙烯塑膠廢棄物焚化之最佳操作條件(第一、二燃燒室焚化溫度分別為450°C、900°C,第一、二然燒室供風量分別為900 NL/min、1200 NL/min),之後其他階段的實驗都在此操作條件下進行。其煙道排放之平均PAHs濃度為288 g/Nm3;在灰燼中PAHs平均含量為2.91 g/g;總PAHs之排放率為362 mg/hr,排放係數為152 mg/kg-PE
接著在第二階段中,於聚乙烯塑膠中加入2%、5%、10%及15%的天然有機酵素作為批次的進料,發現天然有機酵素的加入比率和PAHs的減量並沒有明顯的趨勢,雖然如此,但對於廢氣中PAHs仍有平均約57.1 %的減量效果。其煙道排放之平均PAHs濃度約90.2 g/Nm3;在灰燼中PAHs平均含量為0.911 g/g;總PAHs之排放率為110 mg/hr,排放係數為45.9 mg/kg-PE
到了第三階段,除了天然有機酵素外,還添加預先泡製的三種天然礦石粉(分別為片狀蛇紋岩、泥狀蛇紋岩、沸石),以1:1的方式分別和天然有機酵素混合後加入批次進料中。研究結果顯示:三種礦石粉對廢氣中PAHs的平均減量效果可達72.9 %。其煙道排放之平均PAHs濃度約52.5g/Nm3;在灰燼中PAHs平均含量為2.02 g/g;總PAHs之排放率為71.8mg/hr,排放係數為29.9 mg/kg-PE
由上述實驗結果可以了解,在環數的分佈方面,煙道廢氣所排放的主要為二~三環的PAHs,約佔了80%~90%的比例,其次為五~七環,而以四環之PAHs為最少。雖在加入礦石粉之後,灰燼中之PAHs含量有增加之情況,但天然有機酵素或者是天然有機酵素混合礦石粉,對於廢氣中PAH都有不錯的減量效果。
Abstract
A batch-type, fixed-bed and controlled-air incinerator was used for the treatment of PE waste. We used three kinds of batch-feed to see that the reduction of PAHs emission from the flue gas. The PAH samples were analyzed primarily by using a Hewlett Packard GC/MS.
In the first stage, the PE plastic waste alone was incinerated. Operational parameter, including temperature and amount of air-supply for the primary and secondary combustion chambers, were controlled to investigate the contents and concentrations of particulate, CO and polycyclic aromatic hydrocarbons (PAHs)in the stack flue-gas. The bottom ash samples from the incineration were also collected and analyzed. In the this stage the optimal condition for PE waste incineration was found to be Tprimary=450℃, Tsecondary=900℃, Aprimary=900 NL/min, Aseconday= 1,200 NL/min. At this step, the mean total-PAH concentrations in the steak flue gas were 288 g/Nm3, the mean total-PAH composition in the bottom ash were 2.91 g/g, the mean total-PAH emission rate for this incinerator were 362 mg/hr and the total-PAH emission factor were 152 mg/kg-waste. Next stages were under this optimum condition.
In the second stage, natural fermenter of 2 %wt、5 %wt、10 %wt and 15 %wt was added into PE waste. The batch-feed additives resulted in a mean reduction of 59.5 % of PAHs emission from the flue gas. The mean total-PAH concentrations in the steak flue gas were 90.2 g/Nm3, the mean total-PAH composition in the bottom ash were 0.911 g/g, the mean total-PAH emission rate for this incinerator were 110 mg/hr and the total-PAH emission factor were 45.9 mg/kg-waste
In the third stage, three kinds of natural mineral powder – Marmolite, Serpentinite, Zeolite, were separately blended with the natural fermenter at 1:1 (weight) as the batch-feed additives (These additives should be soaked in the natural fermenter for more than five days.). The batch-feed additives gave a mean reduction of 73.4 % of PAHs emission from the flue gas. The mean total-PAH concentrations in the steak flue gas were 52.5 g/Nm3, the mean total-PAH composition in the bottom ash were 2.02 g/g, the mean total-PAH emission rate for this incinerator were 71.8 mg/hr and the total-PAH emission factor were 29.9 mg/kg-waste
As to PAH homologues, two and three-ring PAHs were dominant in stack flue-gas (average 80% ~90%), while, the four-, five- and seven-ringed PAHs were only accounted for minor fractions the total-PAH mass.
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