共燒技術是一種對環境較為友善的汙染物處理方法，本研究的目的為探討於黑液中添加廢油泥對黑液的燃燒特性改善。在本研究的燃料基本特性分析中，黑液與廢油泥的特性具有很大的互補性，黑液屬於低熱值、高灰分、高硫含量的汙染物，而廢油泥屬於高熱值、低灰分、低硫含量的汙染物。本研究透過熱重分析(TGA)對黑液、廢油泥及兩者的混摻進行燃燒特性分析，添加油泥可以使得最終灰分的殘餘量降低，同時反應前期的失重峰值有明顯的提升，代表添加油泥可以增進黑液前期的燃燒反應，在燃燒指數分析中亦顯示一致的結果。然而，在熱重分析結果中亦發現黑液燃燒過程中的膨脹行為會阻礙揮發份的釋放，此現象在傅立葉轉紅外光譜分析法中亦可被觀察到。此外，在傅立葉轉紅外光譜分析法中所有觀察氣體的訊號強度皆隨著油泥的添加比例上升而增加，添加油泥可以提供更多的揮發分氣體，如CH4，而CO和CO2的濃度則隨著CH4的增加而提升，此外，添加油泥也使得釋出的SO2和NOx量增加。本研究中也利用單顆燃燒爐設備進行燃燒特性的探討，添加油泥對於點燃時間有顯著的降低且前期的質量損失亦有明顯的增加，但添加油泥以及環境溫度的上升皆會造成灰分融化的現象，而融化的灰分會使得燃燒反應難以進行。在產氣分析中，CO和CO2的排放量隨著油泥添加而上升，而SO2和H2S在700 ℃添加10 %油泥的情況下有非常顯著的降低。

Co-combustion may be an environmentally friendly alternative solution to deal with waste. The purpose of this study is to understand the improvement of the combustion characteristics of black liquor by adding sludge. In the property analysis, the properties of black liquor were found to be complementary with oil sludge. Black liquor had low heating value, high ash, and high sulfur content, while oil sludge had high heating value, low ash, and low sulfur content. In TGA analysis, as the increase in oil sludge addition, the final residual ash amount decreases, and the peak value of the first DTG curve increases. That means the addition of oil sludge can promote the reaction in the early stage which also can be observer in the combustion index analysis. However, the TGA analysis also showed that the swelling behavior of black liquor seemed would block the release of volatile matter which also can be observed in FTIR results. Besides, the signal of each gas increase as the increase in oil sludge addition in FTIR results. That meant oil sludge can provide more volatile matter such as CH4, but also more pollutants such as SO2 and NOx. CO and CO2 also increased as more CH4 was released. In this study, single pellet combustion system was used to further understand the combustion behaviors of black liquor and oil sludge. The results showed that adding oil sludge can reduce ignition time of pellet and increase the weight loss rate in early stage. However, the increase in surrounding temperature and addition of oil sludge would make the pellet easy to melt which was a hindrance to the combustion reaction. The analysis of exhaust gas composition showed that adding oil sludge would increase CO and CO2 emissions and one thing was observed that emission of SO2 and H2S significantly decreased at 700 ℃ with 10 % oil sludge addition.

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