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頁籤選單縮合
題名 | Application of Diffusion Flame Environments in Reburning on NO戓Reduction=擴散火燄環境於二次燃燒減除氮氧化物之應用 |
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作者 | 林文江; | 書刊名 | 吳鳳學報 |
卷期 | 4 1996.05[民85.05] |
頁次 | 頁145-155 |
分類號 | 348.432 |
關鍵詞 | 氮氧化物; NO戓消除; 二次燃燒; 擴散火燄; 缺料環境; 對流; Nitrogen oxides; NOx reduction; Reburning; Diffusion flame; Fuel lean; Counter-flow; |
語文 | 英文(English) |
中文摘要 | 本研究應用CH��/N��-O��/CO��/NO/N�砟完麍y擴散火燄,探討二次燃燒在總缺料 環境下,應用擴散火燄對 NO 之減除效應。文獻顯示,大型鍋爐之二次燃燒對 NO 之減除效 應高於小型的試驗,同時由大型試驗的結果得知,其於總缺料環境下仍相當有效。本研究發 現, 視 NO 與擴散火燄接觸方式之不同而可獲得高去除效率(達 90 %)。 一般而言,NO 之高去除效率產生於當其沿火燄平面呈現濃度梯度之時,亦即其與煙氣呈(二維)併流型態 ;而當其呈(一維)對流型態時則無法達此高效率。除此,實驗測得軸向之溫度及各項濃度 分佈均與由一維模型所得之理論預測十分吻合, 然而此一維模型無法解釋當 NO 與挾帶 NO 之煙氣呈併流型態時所產生之高減除效應。 本研究結果隱含重大意義。於對流擴散火燄所測得之軸向分佈與理論結合契合,顯示對碳氫 化合物消化 NO 之動力學能充份掌握。另一方面,在總缺料環境下,若遲滯二次燃料與煙氣 混合時間,則擴散火燄應可大量減除廢氣中之 NO。 此對二次燃燒於鍋爐中之有效創新應用 有重大之啟示意義。 |
英文摘要 | A counter-flow diffusion flame was used to explore the destruction of NOx during reburning. Recent field data have suggested that large boiler demonstrations of reburning, where non-ideal mixing cannot be avoided, were more successful at destroying NO than pilot scale experiments where mixing was more rapid. Furthermore, the field data showed that reburning might be effective under overall fuel lean conditions (in the reburn zone). The NO destruction under such environments is there fore the focus of this study. Flue gas was emulated by an mixture of NO, O �� and CO ��, and fuel by CH ��, both diluted by N ��. It was found that very large destructions of NO were possible, depending on how the NO contacted the diffusion flame zone. In general, efficient destruction (exceeding 90%) of NO occurred primarily when there was a concentration gradient of NO along the same plane as the reaction zone, as in a two dimensional co-flowing, rather than a one dimensional counter-flowing configuration. In addition, the measured axial profiles of temperature, major species and nitrogenous species for the counter-flow flame compared very well with those predicted by a one dimensional model which employed detailed chemical kinetics. However, this 1-D model cannot account for the high destruction that occurred within the regime in which fuel and the oxidant streams were in a co-flow fashion. These results bear significant implications. The agreement between kinetic modeling and measured axial profiles for the counter-flow diffusion flame shows that the kinetics of NO destruction by hydrocarbons are now well understood. In addition, large destructions of NO are possible under overall fuel lean conditions, if turbulent mixing between reburning fuel and flue gas oxygen can be hindered. This has practical implications for new effective applications of reburning in boilers. |
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