- 學位論文
RDF於渦旋式流體化床中之燃燒特性
The Behavior of RDF Combustion in a Vortexing Fluidized Bed Combustor
摘要
台灣為一海島型國家，隨著文明發展、人口的劇增，垃圾量大增而掩埋土地之短缺，且台灣為一典型能源缺乏之國家，因此將廢棄物轉換成另一種形式之燃料實為所趨。廢棄物衍生燃料為廢棄物能源化之重要技術之一，RDF-5與煤炭於流體化床燃燒爐中混燒之可行性已經過實驗證明，另RDF-5中添加CaCO3以降低煙氣中污染物之研究及戴奧辛之生成研究業已獲得初步之結果。 本研究目的為更進一步探討提高RDF-5與燃料於流體化床燃燒爐中之混燒比例，以燃燒100％比例之RDF-5為目標進行最佳操作參數之研究，並於操作時額外添加CaCO3提高鈣氯比，觀察其對煙氣中氯化氫濃度之影響，灰渣部分則檢測不同操作條件下灰渣中之氯及重金屬含量，以進行灰渣再利用之可行性評估。 本研究係於一高4.6 m、底面積0.8 m × 0.4 m之渦旋式流體化床燃燒爐中進行，結果顯示NOx濃度隨著過量空氣提高而增大。額外添加CaCO3，確實能降低煙道氣中HCl 之排放量。戴奧辛的部分，結果顯示該檢測值低於環保法規，不過在飛灰分析中發現Hg含量偏高。 本研究證實了100％ RDF-5燃燒之可行性，因為實驗結果發現CO、N2O、SOx和NOx皆低於法規標準，但煙道氣中HCl濃度卻偏高，不過提高鈣氯比能有效降低HCl濃度，再加強後端污染防治設備，則可降低其污染性。
關鍵字
固態衍生燃料並列摘要
Taiwan is a island type country. With the great increases of the development of civilization and population, the refuse amount heightens but the shortage of landfills. Taiwan is a typical country lack of energy, so converses the refuse into another form of fuel is actually the trend of the times. Refuse derived fuel (RDF) is one of the important waste-to-energy technology. In the previous study, the feasibility of co-firing of RDF-5 with coal has been demonstrated by systematic experiments. And the studies on reducing the concentration of pollutant in flue gas and the emission of Dioxins have been conducted and some preliminary results were obtained. The objectives of this study are to find the optimal operating condition for higher RDF-5 co-firing ratio and 100% RDF-5 co-firing ratio in the goal; adding additional Ca(OH)2 during the incineration for raising the Ca/Cl ratio, and the HCl concentration in the flue gas are observed and to check the chlorine and heavy metal content in the ash in order to evaluate the feasibility of ash reuse.The experimental results indicated that (1) the NOx concentration increases with raising the excess-air ratio；(2) to add CaCO3 during incineration can reduce the HCl concentration in the flue gas；(3) PCDDs/PCDFs concentration in this study also lower than the restriction of environmental regulation. But the Hg concentration in the fly ash is too high. In this study , the feasibility of 100％ RDF-5incineration is demonstrated. The CO、N2O、SOx and NOx concentration are much lower . But HCl are too high. We can improve this problem by adding more CaCO3.