本研究使用美國楊百翰大學先進燃燒技術研究中心所發展之模擬程式PCGC-3，以三維模式模擬粉煤於上吹式噴流床氣化爐中之燃燒及氣化特性，採用之物理及數值模式包括：SIMPLER運演算法則、k-ε紊流模式、PDF平衡燃燒模式、熱量及動量傳遞模式及PSI-Cell計算程式。模擬結果與實際建造之上吹式噴流床煤炭氣化爐所提供之運轉資料進行比對，驗證程式之可靠性。針對O2/C 、H2O/C、粉煤粒徑大小，及氣化爐進給角度進行參數分析，觀察其溫度分佈、生成燃氣分佈。由結果發現，當改變粉煤負載率使O2/C比例降低時，則會使CO2、H2O生成量減少，CO、H2及CH4生成量增加；當改變O2量使O2/C比例降低時，則會使CO2、CO及H2O生成量減少，H2及CH4生成量增加，同時氣化爐內積碳量也會增加。當H2O/C比例增加時，氣相反應區重組反應趨勢產生H2，使得在出口處CH4生成量減少，H2生成量增加。另外增加H2O/C比例、渦旋直徑及縮小粉煤粒徑，皆有助於降低粉煤氣化所需之時間。

　The features of pulverized coal combustion and gasification in a up-flow entrained bed gasifier have been investigated by using the three-dimensional computer code PCGC-3, which was developed by ACERC at Brigham Young University. The physical and numerical models adopted in the present study include SIMPLER algorithm, k-ε turbulence model, PDF equilibrium, equations of mass, energy, momentum and transport, and PSI-Cell computational procedure. The predicted results are compared with the simulation data of a practical up-flow entrained bed gasifier to validate the present computer code. Effects of O2/C ratio, H2O/C ratio, coal particle size and inlet profile on the temperature distribution, constituents of syngas and carbon conversion are examined. The results obtained from the present study show that O2/C and H2O/C ratios are important parameters for coal gasification. A lower O2/C ratio by changing the coal loading ratio leads to higher concentrations of CO, H2, and CH4 and lower ones of CO2 and H2O at outlet, while a lower O2/C ratio by changing O2 supply leads to higher concentrations of H2 and CH4 and lower ones of CO, CO2 and H2O at outlet. It is noted that the concentration of solid carbon is substantially higher with a lower O2/C ratio by changing O2 supply. As the H2O/C ratio increases, reforming reaction of CH4 becomes more important and higher concentrations of H2 are produced. It is also found that the time of carbon conversion can be reduced with a higher H2O/C ratio, smaller coal particles, and increased swirl diameters.

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