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研究生:沈倉輝
研究生(外文):Tsang-Huei Shen
論文名稱:重質油氣化爐之數值模擬與設計
論文名稱(外文):Numerical Simulation and Design of Heavy Oil Gasifier Chamber
指導教授:邱輝煌邱輝煌引用關係
指導教授(外文):Huei-Huang Chiu
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:2004
畢業學年度:92
語文別:中文
論文頁數:97
中文關鍵詞:噴流床式氣化爐重質油氣化合成氣
外文關鍵詞:heavy oilentrained-flow gasifiergasificationsyngas
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  重質油氣化複合循環發電系統(IGCC)在改善熱效率、減少溫室氣體排放、以及燃料的多選擇性上之實際使用一直被人們寄予厚望。於是本論文研究主題為探討乳化重油ORIMULSION,其在噴流床式氣化爐中之氣化特性。初步先假設進口燃料為ORIMULSION高溫熱解(Pyrolysis)後之主要物質:CH4、H2O、CO、CO2、H2及C。目的在觀察及比較在經過整體氣化反應後,爐內溫度分佈及出口合成氣(Syngas)組成。在假設碳為氣態以及固定燃料供給量下,我們分別使用不同供氧量,紊流模式,壁面溫度及操作壓力為操作條件。研究發現,若增加氧化劑,會導致H2及CO產量減少,CO2增加,且對H2O影響不大。而使用DSM紊流模式下,H2O產量會有明顯的增加,且會計算出較慢的紊流混合速率。同時增加壁面溫度對合成氣產量影響不顯著。而操作壓力在1.8MPa下就可以達到預計的效果。
  The practical use of Integrated extra heavy oil Gasification Combined Cycle (IGCC) power generation is expected from the viewpoints of the improvement of thermal efficiency, the decrease in emission of greenhouse gases, the fuel diversification, and the cost decrease, etc. The theme of studying in this thesis lies in probing into the emulsified heavy oil named ORIMULSION gasification characteristic in the entrained-flow gasifier. Tentatively, suppose the fuel imported as ORIMULSION composition after pyrolysis: CH4、H2O、CO、CO2、H2 and C. The purpose lies in observing and comparing the distribution of temperature in the chamber and the composition of syngas exported after the global gasification reactions finish. Furthermore, suppose gaseous carbon and fixed fuel supply, respectively we use different oxygen supply , turbulence model , wall temperature and operation pressure as operation conditions. The result of study shows: When increasing the oxidant supply, it will cause the reduction of H2 and CO and increase of CO2 in the exit, and it also have a little effect on H2O. If DSM turbulence model is enabled being used for calculating, then H2O will increase in a large amount obviously and calculate out slower turbulence mixing speed. The way to increase wall temperature does not have obvious influence on syngas exported at the same time. And operation pressure can get the ideal result of estimating at 1.8MPa.
中文摘要 i
English Abstract ii
致謝 iii
目 錄 iv
表目錄 vii
圖目錄 viii
符號說明 xii
第一章、序論
1-1前言 1
1-2文獻回顧 3
1-2-1氣化歷史介紹 3
1-2-2氣化原理與氣化爐 4
1-2-3氣化之數值模擬文獻 5
1-3 本文概述 8

第二章、數學及物理模式
2-1 問題假設 9
2-2 物理模式(統御方程式) 9
2-2-1傳輸方程式 9
2-2-2動量傳輸 11
2-2-3熱傳 11
2-2-4質傳 11
2-3紊流模式 12
2-3-1雷諾平均方程式 12
2-3-2 k-ε紊流模式 15
2-3-3 DSM紊流模式 16
2-4 化學反應模式 17
2-4-1使用燃料假設 18
2-4-2高溫裂解過程 18
2-4-3焦炭氣化反應過程 19
2-4-4氣相氣化反應過程 21

第三章、數值方法
3-1 CFX程式功能與內容概述 24
3-2邊界契合座標系統 25
3-3 非交錯性格點 25
3-4多重區塊格點結構 26
3-5 CFX格點品質判別 26
3-6 SIMPLEC數值運算法則 27
3-7收斂標準 27
3-8 噴流床式氣化爐格點建構 28

第四章、結果與討論
4-1 噴流床式氣化爐入口設計 29
4-2 冷流場測試 29
4-3 操作條件 30
4-4氣相氣化反應計算結果 31
4-4-1不同供氧量比較 31
4-4-2不同紊流模式比較 32
4-4-3不同壁溫比較 32
4-4-4不同操作壓力比較 33
4-5結論 33

第五章、未來工作與建議 35
參考文獻 36
附表 41
附圖 45
自述
著作權聲明
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