本研究以美國楊百翰大學ACERC實驗室之模擬程式PCGC-3模擬粉煤氣化程序，分析粉煤在噴流床式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計算程序。首先將模擬結果與文獻之數據做一比對，驗證模擬之合理性，接著調整不同比例之O2/Coal及H2O/Coal、入口壓力及煤粒粒徑大小等操作參數，以觀察其溫度分布、生成燃氣之組成以及對炭轉換率之影響。由結果可發現，O2/C與H2O/C確為影響氣化結果之重要參數，當O2/C增加，將使燃燒反應量較多，生成較多之CO2及H2O，同時炭轉換率也會提升，而CO及H2含量則減少。改變H2O/C主要將影響CO及H2O之含量，H2O/C愈高，CO含量將減少，同時出口之H2O及H2將增加。另外壓力的增加及粒徑的縮小都有助於提升氣化的效果、增加炭轉換率。

The features of pulverized coal combustion and gasification in an entrained-flow bed gasifier have been investigated by using the 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-εturbulence model, PDF equilibrium, equations of mass, energy, momentum and transport, and PSI-Cell computational procedure. The predicted results are first compared with the reference data to validate the computer code. Effects of O2/C ratio, H2O/C ratio, inlet pressure and coal particle size on the temperature distribution, constituents of syngas and carbon conversion are then examined. The results obtained from the present study show that O2/C and H2O/C ratios are important parameters for coal gasification. A higher O2/C ratio leads to higher CO2, H2O concentrations and carbon conversion, as well as lower CO and H2 concentrations. On the other hand, a higher H2O/C ratio leads to a lower CO concentration and higher H2O and H2 concentrations. In addition, increasing pressure and reducing particle size promote coal gasification and carbon conversion.

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