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Student Number 973303003
Author Ih-yang Wu(吳志陽)
Author's Email Address ihyangwu@kiss99.com
Statistics This thesis had been viewed 506 times. Download 220 times.
Department Executive Master of Mechanical Engineering
Year 2010
Semester 2
Degree Master
Type of Document Master's Thesis
Language zh-TW.Big5 Chinese
Title An Experimental Study of a Syngas Burner with Low NOx Emission
Date of Defense 2011-07-21
Page Count 64
Keyword
  • Integrated Gasification Combined Cycles
  • Syngas
  • Weak swirl jet burner
  • Abstract The basic design concept of weak-swirl-jet burner (WSJB) is coming from Bédat & Cheng (1995). To settle a weak jet swirl generator in advance position, produce a stable diverging flow field at the lower reaches and a bowl-shaped premixed turbulent flame. Then, this generator is made by 4 tangential weak air jets at 20 degree_inclination. Syngas, a mixture of mainly carbon monoxide (CO) and hydrogen (H2), is an important fuel in Integrated Gasification Combined Cycles. The most of previous studies in the feature of syngas combustion are limited in the laminar flame regime, and it’s scanty of studies to focus on turbulence combustion of syngas. However, utilizing the fast mixing apparatus and the lean turbulent combustion technique developed in our laboratory, we investigated the turbulent burning velocities (ST) and the exhaust emissions of the premixed lean syngas flames in the WSJB at two equivalence ratios of equivalence rate = 0.5 and equivalence rate = 0.7. The syngas used is the product from fluidized bed, with 65% CO and 35% H2. We identified the stable operation regime of the burner. Using particle image velocimetry and a gas analyzer, we measured the turbulent burning velocities and the emissions of NOx and CO under different equivalence ratios, mixture flow rates (characterized by the jet Reynolds number Rej ), and swirl strength (characterized by the swirl number S). The main results from our experiments include: (1) On the (Rej , S) plane, the stable operation region for equivalence rate equivalence rate = 0.7 is broader than that for equivalence rate = 0.5; (2) Increasing the concentration of H2 extends the flammable limits of the syngas and increases the ST ; (3) Both ST and turbulent intensity increase with the increase of Rej ; (4) Turbulent burning velocities normalized by the laminar burning velocity, ST/SL, of the bowl-shaped flames in the WSJB are higher than the turbulent spherical flames under the same conditions; and (5) Over the range of Rej and S explored, the NOx emission is always below 10 ppm, with the minimum below 5 ppm for equivalence rate = 0.5. Our experiment demonstrated that the WSJB is superb burner in terms of reducing NOx emission. Moreover, our study improves to understanding the turbulent flame of syngas feature and practical apply limitation. That benefits the development of Integrated Gasification Combined Cycles (IGCC).
    Table of Content 摘要I
    ABSTRACTII
    誌謝III
    目錄IV
    圖目錄VII
    表目錄IX
    符號說明X
    第一章、 前言…………………………………………………………1
    1.1研究動機……………………………………………………1
    1.2問題所………………………………………………………3
    1.3解決方法……………………………………………………4
    1.4論文架構……………………………………………………4
    第二章、 文獻回顧……………………………………………………5
    2.1預混燃燒器設計……………………………………………5
    2.2預混紊流燃燒簡介…………………………………………5
    2.3漩渦火焰之原理……………………………………………7
    2.3.1漩渦流場特性………………………………………………7
    2.3.2漩渦流產生方法……………………………………………8
    2.3.3漩渦火焰及燃燒器…………………………………………9
    2.4合成氣低氮氧化合物燃燒器………………………………11
    2.5污染物生成…………………………………………………12
    2.6預混紊流燃燒速度之量測…………………………………12
    2.6.1  不同分析位置對決定紊流燃燒速度ST的影響……………12
    2.6.2紊流燃燒速度量測誤差評估……………………………………13
    第三章、 實驗設備與方法……………………………………………19
    3.1弱漩渦噴流燃燒器…………………………………………19
    3.2燃氣供應與控制系統………………………………………20
    3.3高速質點影像測速技術(Particle image velocimetry)………………………………………………………………21
    3.4紊流燃燒速度的量測及分析………………………………22
    3.5廢氣分析及濃度校正………………………………………24
    3.6實驗流程……………………………………………………25
    第四章、 結果與討論…………………………………………………33
    4.1合成氣燃燒器性能測試……………………………………33
    4.2漩渦流場量測分析…………………………………………34
    4.3PIV計算視窗 (window sizes)之誤差分析………………35
    4.4WSJB流場特性………………………………………………35
    4.5燃燒器廢氣量測……………………………………………35
    4.6紊流燃燒速度量測結果……………………………………37
    第五章、 結論與未來工作……………………………………………45
    5.1合成氣弱漩渦噴流燃燒器測試……………………………45
    5.2未來工作……………………………………………………46
    參考文獻 ………………………………………………………………47
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    Advisor
  • Shenq-yang Shy(施聖洋)
  • Files
  • 973303003.pdf
  • approve in 2 years
    Date of Submission 2011-08-27

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