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研究生:劉其翰
研究生(外文):Chi-HanLiu
論文名稱:壓力式粉煤挾帶床氣化爐之燃燒模式比較及操作條件分析
論文名稱(外文):Comparison of Combustion Models and Analyses of Operating Conditions for the Pressurized, Pulverized-Coal, Entrained-Bed Gasifier
指導教授:江滄柳
指導教授(外文):Tsung-Leo Jiang
學位類別:碩士
校院名稱:國立成功大學
系所名稱:航空太空工程學系碩博士班
學門:工程學門
學類:機械工程學類
論文種類:學術論文
論文出版年:2012
畢業學年度:100
語文別:中文
論文頁數:108
中文關鍵詞:氣化燃燒模式數值模擬
外文關鍵詞:GasificationCombustion ModelNumerical Simulation
相關次數:
  • 被引用被引用:0
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  • 下載下載:27
  • 收藏至我的研究室書目清單書目收藏:1
本研究採用商用型計算流體力學軟體ANSYS–FLUENT,針對壓力式挾帶床粉煤氣化爐,建立一氣化燃燒之數值模擬分析模式。並探討不同燃燒模式對出口合成氣組成預測之準確性,以及改變操作條件對出口合成氣組成之影響。探討之燃燒模式包括非預混之平衡模式、非預混之層流火焰模式及有限渦流消散模式三種。計算之結果顯示,採用非預混之層流火焰模式,所模擬之合成氣組成與實驗數據較一致。非預混之平衡模式,在出口產物組成上,比層流火焰模式較偏向燃燒反應。至於有限渦流消散模式則高估一氧化碳、氫氣及二氧化碳之濃度。而在研究中也發現水氣轉換反應值,對於平衡出口合成氣之組成有很大的影響。在參數分析部份,則是進行不同氧碳比與操作壓力之影響分析。研究結果顯示,低氧碳比會產出較高濃度一氧化碳及氫氣之氣化產物,而如二氧化碳之燃燒產物濃度則較低。在低操作壓力時,氣化區域較不明顯,且煤焦轉換率較低。而隨操作壓力提高,煤焦轉換率逐漸提升,且出口之一氧化碳及氫氣莫爾分率增加,二氧化碳莫爾分率則是降低。
In the present study, a numerical model has been developed for a pressurized, pulverized-coal, entrained-bed gasifier by the commercial CFD software, ANSYS-FLUENT. The accuracy for the predicted composition of the outlet syngas is investigated for different combustion models. The influence of the operating conditions on the composition of the outlet syngas is also examined. Three different combustion models including non-premixed equilibrium, non-premixed flamelet, and finite-rate/eddy dissipation model, are investigated. The results obtained from the present computations show that the predicted syngas composition by the non-premixed flamelet model is in the best agreement with the experimental data. The non-premixed equilibrium model, however, leads to a composition of the outlet syngas more due to combustion. The concentrations of CO, H2, and CO2 are over-estimated by the finite-rate/eddy-dissipation model. The present study also indicates that the reaction parameters of water-gas shift reaction significantly affect the outlet syngas composition. The effects of the oxygen/carbon ratio and the operating pressure on the gasification performance are studied in the present parametric study. The results show that a lower oxygen/carbon ratio leads to higher fractions of gasification species such as CO and H2, and a lower fraction of combustion species such as CO2. A lower operating pressure results in a lower char conversion rate, and the gasification zone is not conspicuous. With a higher operating pressure, the char conversion rate increases. The mole fractions of CO and H2 at outlet increase, while that of CO2 decreases.
摘要 I
Abstract III
誌謝 V
目錄 VII
表目錄 X
圖目錄 XI
符號說明 XIV
第一章、緒論 1
§1.1 研究背景 1
§1.2 氣化理論 2
§1.3 氣化爐分類 4
§1.4 國內氣化部份 8
§1.5 文獻回顧 10
§1.6 研究動機及目的 30
第二章、研究方法 32
§2.1 數學與物理模式 32
§2.2 模型問題之假設 32
§2.3 連續相-統御方程式 33
§2.4 離散相之統御方程式 36
§2.5 紊流反應模式 47
§2.6 有限速率之渦流耗散模式(Finite-Rate/Eddy Dissipation Model) 54
§2.7 化學反應動力式 57
§2.8 煤粒之相關性質 60
§2.9 氣化爐-幾何尺寸與入口條件 61
第三章、數值方法 65
§3.1 概述 65
§3.2 計算流程 65
§3.3 邊界條件 66
§3.4 SIMPLE-運算法則 67
§3.5 離散相計算流程 71
§3.6 收斂標準 71
第四章、結果與討論 73
§4.1 不同紊流反應模式之出口成份模擬結果 73
§4.2 不同O2/C之氣化效能評估 85
§4.3 不同操作壓力之氣化效能評估 89
第五章、結論與未來建議 96
§5.1 結論 96
§5.2 未來建議 97
第六章、參考文獻 98
自序 108


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